focus adjustment apparatus, imaging apparatus and lens drum

专利摘要:
FOCUS ADJUSTMENT DEVICE, IMAGING DEVICE AND LENS DRUM. A focal point adjustment control apparatus comprising: including a focal point detection part for calculating an evaluation value regarding the contrast of an image by an optical system and detection of focal point adjustment condition of the optical system is provided. ; an acquisition part for acquiring from a lens drum the maximum and/or minimum value of an image plane motion coefficient indicating a correspondence relationship between the amount of motion of a focal point adjustment lens included in the optical system and the amount of motion of an image plane; and a controller employing the maximum value and/or the minimum value of the image plane motion coefficient to determine the driving speed of the focal point adjustment lens during detection of the focal point adjustment condition by the detection part. focal point.
公开号:BR112014011332B1
申请号:R112014011332-7
申请日:2012-11-09
公开日:2021-05-18
发明作者:Hiroyuki Tomita；Toshiaki Maeda
申请人:Nikon Corporation；
IPC主号:

专利说明:

Background of the Invention Field of Invention
[001] The present invention relates to a focus adjustment apparatus, an image creation apparatus and a lens drum. Description of Related Art
[002] A technique is known that calculates an evaluation value with respect to contrast through an optical system while driving a focus adjustment lens at a predetermined drive speed in the optical axis direction, to thereby detect a focal state of the optical system (reference to Patent Literature 1: JP2010-139666A, for example).
[003] Patent Literature 1: JP2010-139666A Invention Summary
[004] Objectives of the present invention include providing a focus adjustment apparatus that can properly detect a focus adjustment state of an optical system.
[005] The present invention provides the following apparatus to achieve the above objectives.
[006] The focus adjustment control apparatus mentioned in claim 1 is characterized in that it comprises: a focus detection unit that calculates an evaluation value with respect to the contrast of an image through an optical system to detect a focus adjustment state of the optical system; an acquisition unit that acquires from a lens drum at least one of a maximum value and a minimum value of an image plane motion coefficient representing the correspondence relationship between a motion amount of an in-focus adjustment lens. - included in the optical system and a movement amount of an image plane; and a control unit that uses at least one of the maximum value and the minimum value of the image plane motion coefficient to determine a drive speed for the focus adjustment lens when the focus detection unit detects the state of focus adjustment.
[007] The focus adjustment control apparatus mentioned in claim 2 is, in the focus adjustment control apparatus as mentioned in claim 1, characterized in that when the amount of movement in a direction of optical geometric axis of the lens focus adjustment is TL and image plane motion amount is TI, image plane motion coefficient is a coefficient that corresponds to a ratio defined by TL and TI and is determined depending on a lens position of the lens of focus adjustment.
[008] The focus adjustment control apparatus mentioned in claim 3 is, in the focus adjustment control apparatus as mentioned in claim 2, characterized in that when the image plane motion coefficient is a coefficient corresponding to TI/TL, the control unit uses the maximum value of the image plane motion coefficient to determine the drive speed which is a speed that allows the focus detection unit to detect the focus adjustment state even if the lens adjust focus move to a position where the image plane motion coefficient is the maximum value of the image plane motion coefficient, or when the image plane motion coefficient is a coefficient that corresponds to TL/TI , the control unit uses the minimum value of the image plane motion coefficient to determine the drive speed which is a speed that allows the focus detection unit to detect the focus adjustment state even if the focus adjustment lens moves to a position where the image plane motion coefficient is the minimum value of the image plane motion coefficient.
[009] The focus adjustment control apparatus mentioned in claim 4 is characterized in that it comprises: a focus detection unit that calculates an evaluation value with respect to the contrast of an image through an optical system to detect a state adjustment of focus of the optical system; an acquisition unit that acquires from a lens drum an image plane motion coefficient representing the correspondence relationship between a motion amount of a focus adjustment lens included in the optical system and a motion amount of a plane of image, and information regarding an amount of backlash of the optical system; a control unit that performs scanning control through the focus adjustment lens when the focus detection unit detects the focus adjustment state and performs, after the focus detection unit detects a focused position, the focus trigger control to move the focus adjustment lens to the focused position; and a control unit that uses the image plane motion coefficient and the amount of slack to determine whether or not to perform slack reduction in the focus trigger control.
[0010] The focus adjustment control apparatus mentioned in claim 5 is, in the focus adjustment control apparatus according to claim 4, characterized in that the control unit uses the image plane motion coefficient and the amount of slack to calculate an image plane motion amount corresponding to the amount of slack and compare the calculated image plane motion amount corresponding to the amount of slack with a focal depth of an image through the optical system to determine whether or does not perform backlash reduction in focus trigger control.
[0011] The focus adjustment control apparatus mentioned in claim 6 is, in the focus adjustment control apparatus according to claim 4 or 5, characterized in that the control unit uses the plane motion coefficient of image and the amount of clearance to determine whether or not to perform clearance reduction in the focus trigger control, the image plane motion coefficient corresponding to a lens position of the focus adjustment lens when the focus adjustment lens is reverse triggered to focus position after focus position is detected.
[0012] The focus adjustment control apparatus according to claim 7 is, in the focus adjustment control apparatus according to claim 4 or 5, characterized in that when the amount of movement in a direction of Optical geometric axis of the focus adjustment lens is TL and the amount of motion of the image plane is TI, the coefficient of motion of the image plane is a coefficient that corresponds to a ratio defined by TL and TI, and when the coefficient of Image plane movement is a coefficient that corresponds to TI/TL, the control unit uses a maximum value of the image plane movement coefficient and the amount of slack to determine whether or not slack reduction is performed in the control. of focus trigger, or when the image plane motion coefficient is a coefficient that corresponds to TL/TI, the control unit uses a minimum value of the image plane motion coefficient and the amount of slack for d eterminate whether or not to perform backlash reduction in the focus trigger control.
[0013] The focus adjustment control apparatus mentioned in claim 8 is, in the focus adjustment control apparatus according to claim 4 or 5, characterized in that the control unit uses the plane motion coefficient of image and the amount of slack to determine whether or not to perform slack reduction in the focus trigger control, the image plane motion coefficient corresponding to a lens position of the focus adjustment lens in the vicinity of the focused lens position of focus adjustment.
[0014] The imaging apparatus according to claim 9 comprises the focus adjustment control apparatus according to one of claims 1 to 8.
[0015] The lens barrel according to claim 10 is characterized in that it comprises: an optical system that includes a focus adjustment lens; a drive unit that drives the focus adjustment lens in an optical axis direction; a transceiver unit that performs the transmission and reception of a signal between the lens drum and a camera body; and a control unit which, when receiving a predetermined signal from a camera body via the transceiver unit, transmits to the camera body via the transceiver unit at least one of a maximum value and a minimum value of a plane motion coefficient representing the correspondence relationship between an amount of movement of the focus adjustment lens and an amount of movement of an image plane.
[0016] The lens drum according to claim 11 is, in the lens drum according to claim 10, characterized in that it additionally comprises a storage unit that stores at least one of a maximum and a minimum value of the image plane motion coefficient.
[0017] The lens drum according to claim 12 is, in the lens drum according to claim 10 or 11, characterized in that the image plane motion coefficient corresponds to a ratio defined by the amount of movement in the optical axis direction of the focus adjustment lens and the amount of motion of the image plane on the optical axis.
[0018] The lens barrel according to claim 13 is characterized in that it comprises: an optical system that includes a focus adjustment lens; a drive unit that drives the focus adjustment lens in an optical axis direction; a transceiver unit that performs the transmission and reception of a signal between the lens drum and a camera body; and a control unit that controls the transceiver unit so that the transceiver unit transmits, to a camera body, the first information determined depending on a lens position of the focus adjustment lens, where the control unit, when receiving a predetermined signal from a camera body via the transceiver unit transmits to the camera body via the transceiver unit at least one of a maximum value and a minimum value of the first information.
[0019] The lens barrel according to claim 14 is, in the lens barrel according to claim 13, characterized in that when a movement amount of the focus adjustment lens is TL and a movement amount of a image plane is TI, the first information is a coefficient that corresponds to TL/TI or a coefficient that corresponds to TI/TL.
[0020] The lens barrel according to claim 15 is characterized in that it comprises: an optical system that includes a focus adjustment lens; a drive unit that drives the focus adjustment lens in an optical geometry axis direction; a transceiver unit that performs transmission and reception of a signal between the lens barrel and a camera body; and a control unit that controls the transceiver unit so that the transceiver unit transmits to a camera body a first image plane motion coefficient determined depending on a lens position of the focus adjustment lens, where the control unit , when receiving a predetermined signal from a camera body via the transceiver unit, transmits to the camera body via the transceiver unit a second image plane motion coefficient which does not depend on the lens position of the focus adjustment lens.
[0021] The lens drum according to claim 16 is, in the lens drum according to claim 15, characterized in that the second image plane motion coefficient is at least one of a maximum value and a value minimum of the first image plane motion coefficient.
[0022] The lens barrel according to claim 17 is, in the lens barrel according to claim 15 or 16, characterized in that it further comprises a zoom lens drive unit that drives a zoom lens in the direction of optical axis, where when a zoom lens focal length does not vary, the second image plane motion coefficient does not vary even if the lens position of the focus adjustment lens varies, but when the focal length of the lens does not change. zoom varies, second image plane motion coefficient varies.
[0023] The camera body according to claim 18 is characterized in that it comprises: a focus detection unit that calculates an evaluation value with respect to the contrast of an image through an optical system to detect an adjustment state focus of the optical system; a transceiver unit that performs the transmission and reception of a signal between the camera body and a lens drum; and a control unit that uses the signal received through the transceiver unit to perform drive control for a focus adjustment lens included in the optical system, where the control unit controls the transceiver unit so that the transceiver unit transmits to a lens drum a first demand signal that requests a first image plane motion coefficient determined depending on a lens position of the focus adjustment lens, and a second demand signal that requests a second image plane motion coefficient determined not depending on the lens position of the focus adjustment lens, and receives the first image plane motion coefficient and the second image plane motion coefficient from the lens drum.
[0024] The camera body according to claim 19 is, in the camera body according to claim 18, characterized in that the second image plane motion coefficient is at least one of a maximum value and a value minimum of the first image plane motion coefficient.
[0025] The camera body according to claim 20 is, in the camera body according to claim 19, characterized in that when a movement amount in an optical axis-geometric direction of the focus adjustment lens is TL and a motion amount of an image plane is TI, the image plane motion coefficient is a coefficient that corresponds to a ratio defined by TL and TI, and the control unit performs a predetermined operation when the plane motion coefficient image is a coefficient that corresponds to TI/TL and the first image plane motion coefficient corresponding to a current lens position of the focus adjustment lens is determined to be greater than the second image plane motion coefficient or when the image plane motion coefficient is a coefficient corresponding to TL/TI and the first image plane motion coefficient corresponding to a current lens position of the Focus adjustment is determined to be less than the second image plane motion coefficient.
[0026] The camera body according to claim 21 is, in the camera body according to claim 19, characterized in that the control unit performs a predetermined operation when the first image plane motion coefficient equals to second image plane motion coefficient is not detected as a result of acquiring the first image plane motion coefficient corresponding to a current lens position of the focus adjustment lens while driving the end-to-end focus adjustment lens to the other end in an optical axis direction.
[0027] The camera body according to claim 22 is, in the camera body according to claim 20 or 21, characterized in that the predetermined operation is at least one control that performs the adjustment lens search drive focus at a second speed lower than a first speed which is a search trigger speed before determination, control that prohibits notifying a photographer that a focused state has been obtained, and control that prohibits the focus detection unit from detecting the focus adjustment state.
[0028] The camera system according to claim 23 is characterized in that it comprises the camera body according to any one of claims 18 to 22 and a lens barrel.
[0029] According to the present invention, a focus adjustment state of an optical system can be properly detected. Brief Description of Drawings
[0030] FIGURE 1 is a block diagram illustrating a camera according to the embodiments of the present invention;
FIGURE 2 is a front elevation view of an imaging plane of an imaging apparatus illustrated in FIGURE 1;
[0032] FIGURE 3 is a front elevation view that enlarges part III of FIGURE 2 to schematically illustrate an arrangement of focus detection pixels 222a and 222b;
FIGURE 4A is a front elevation view illustrating one of the imaging pixels 221 enlarged;
[0034] FIGURE 4B is a front elevation view illustrating one of the increased focus detection pixels 222a;
[0035] FIGURE 4C is a front elevation view illustrating one of the increased focus detection pixels 222b;
[0036] FIGURE 4D is a cross-sectional view illustrating one of the imaging pixels 221 enlarged;
[0037] FIGURE 4E is a cross-sectional view illustrating one of the increased focus detection pixels 222a;
[0038] FIGURE 4F is a cross-sectional view illustrating one of the increased focus detection pixels 222b;
[0039] FIGURE 5 is a cross-sectional view along line V-V of FIGURE 3;
[0040] FIGURE 6 presents a table illustrating a relationship between a lens position of a zoom lens 32 (focal length) and a lens position of a focus lens 33 (image creation distance), and a coefficient of K image plane movement;
[0041] FIGURE 7 is a flowchart illustrating the operation of a first mode;
[0042] FIGURE 8 is a view to explain an amount of clearance G of a drive transmission mechanism for the focus lens 33;
[0043] FIGURE 9 is a set of diagrams illustrating a relationship between a focus lens position and a focus evaluation value and the relationships between a focus lens position and time when a scan operation and a trigger of focus based on a contrast detection system are performed according to a modality below;
[0044] FIGURE 10 is a flowchart illustrating the operation according to the second embodiment;
[0045] FIGURE 11 is a flowchart illustrating the operation according to a third embodiment;
[0046] FIGURE 12 is a flowchart illustrating an operation according to a fourth embodiment;
[0047] FIGURE 13 is a block diagram illustrating a camera according to a fifth embodiment;
[0048] FIGURE 14 is a flowchart illustrating the operation according to the fifth mode;
[0049] FIGURE 15 is a flowchart illustrating an anomaly determination process according to the fifth embodiment;
[0050] FIGURE 16 is a diagram illustrating an example of a wave to explain a specific example of the anomaly determination process according to the fifth embodiment;
[0051] FIGURE 17 presents a table illustrating a relationship between the lens position of the zoom lens 32 (focal length) and a maximum image plane motion coefficient Kmax;
[0052] FIGURE 18 is a flowchart illustrating the operation according to a sixth embodiment; and
[0053] FIGURE 19 is a flowchart illustrating an anomaly determination process according to the sixth modality. Description of Preferred Modalities
[0054] Embodiments of the present invention will hereinafter be described with reference to the drawings. First Mode
[0055] FIGURE 1 is a view of the main configuration illustrating a digital camera 1 according to the present embodiment. The digital camera 1 according to the present embodiment (simply referred to as "camera 1" hereinafter) is configured of a camera body 2 and a lens barrel 3, so that a mounting unit 401 of the camera body 2 and a mounting unit 402 of lens barrel 3 are detachably coupled together.
[0056] The lens barrel 3 is an interchangeable lens that can be detachably attached to the camera body 2. As illustrated in FIGURE 1, the lens barrel 3 is provided with an optical imaging system that includes lenses 31 , 32, 33 and 34 and an opening 35.
[0057] The lens 33 is a focusing lens, which can be moved in the direction of the optical axis L1 to thereby allow the focal length of the optical imaging system to be adjusted. The focus lens 33 is provided so as to be movable along the optical geometric axis L1 of the lens barrel 3, and the position of the focus lens 33 can be adjusted by a focus lens drive motor 331 while it is detected by a 332 encoder for the focus lens.
[0058] The specific configuration of the movement mechanism for the focus lens 33 along the optical axis L1 is not particularly limited. As an example, a rotating drum is rotatably inserted into a fixed drum fixed to the lens drum 3. The inner circumferential surface of this rotating drum is formed with a helical groove (spiral groove). The end of a lens frame to which the focus lens 33 is attached is engaged with the helical groove. The focus lens drive motor 331 is used to rotate the rotating drum so that the focus lens 33 attached to the lens frame moves straight along the optical axis L1.
[0059] As described above, by rotating the rotating barrel with respect to the lens barrel 3, the focus lens 33 attached to the lens frame moves straight towards the optical axis L1. The 331 focus lens drive motor as a drive source for the above movement is provided in the lens drum 3. The 331 focus lens drive motor and the rotating drum are, for example, coupled through a transmission comprising a plurality of gears. If the drive shaft of the 331 focus lens drive motor is driven to rotate in any direction, then that drive force will be transmitted to the rotating drum by a predetermined gear ratio to drive in any direction, thus moving the focus lens 33 fixed to the direct lens frame in a determined direction along the optical axis L1. If, on the other hand, the drive shaft of the focus lens drive motor 331 is driven to rotate in the opposite direction, then the transmission gears also rotate in the opposite directions, and the focus lens 33 will move straight in the opposite direction to the along the optical axis L1.
[0060] The position of the focus lens 33 is detected by the encoder 332 for the focus lens. As already described, the position in the direction of the optical axis L1 of the focus lens 33 is correlated with the rotation angle of the rotating drum, and can thus be determined by detecting the relative rotation angle of the rotating drum with respect to the 3 lens drum for example.
[0061] As the encoder 332 for the focus lens in the present embodiment, it is possible to use one of which detects the rotation of a rotating disc coupled to the rotating drive of the rotating drum by a light sensor such as a mode light switch to send a pulse signal corresponding to the speed of rotation, or one that creates an encoder pattern on the surface of a flexible printed circuit board provided on any of the fixed drum and rotating drum in contact with a brush contact that is provided on the another and detects the change in the contact position corresponding to the amount of movement of the rotating drum (in the direction of rotation or direction of optical geometry axis) by a detection circuit, etc.
[0062] The focus lens 33 can be moved by rotating the rotating drum described above from the end on the side of the camera body (also referred to as "near end") to the end on the object side (also referred to as "end infinite") in the direction of the optical axis L1. The encoder 332 for the focus lens detects the current position of the focus lens 33 and sends the current position information. A lens control unit 36 performs control to transmit the current position information to a camera control unit 21. The camera control unit 21 uses the current position information to calculate a target lens trigger position. of focus 33, a drive speed for the focus lens 33, or an image plane movement speed (hereinafter referred to as a "drive information"). The camera control unit 21 performs control to transmit the drive information to the lens control unit 36. Based on the drive information, the lens control unit 36 performs drive control to the drive motor of 331 focus lens.
[0063] On the other hand, lens 32 is a zoom lens, which can be moved in the direction of the optical axis L1 to thereby allow the image amplification of the optical imaging system to be adjusted. As in the case of the focus lens described above 33, the position of the zoom lens 32 can be adjusted by a zoom lens drive motor 321 while being detected by an encoder 322 for the zoom lens. The position of the zoom lens 32 can be adjusted by operating a zoom knob provided on an operation unit 28 or by operating a zoom ring (not shown) provided on the lens barrel 3. The movement mechanism for the lens of zoom 32 along the optical axis L1 can be the same as the mechanism described above for the focus lens 33. Encoder 322 settings for the zoom lens and zoom lens drive motor 321 can also be the same as for the 332 encoder for the focus lens and the 331 focus lens drive motor.
[0064] Aperture 35 is configured so that the aperture size centered on the optical axis L1 can be adjusted in order to restrict the amount of light beams that pass through the optical imaging system above and reach an imaging device. image creation 22 and to adjust the amount of smearing. Aperture size 35 is adjusted by a suitable aperture size, which has been calculated in auto exposure mode, being sent from camera control unit 21 through lens control unit 36, for example. This adjustment can also be performed by an aperture size, which was determined in manual operation using the operating unit 28 provided in the camera body 2, being registered from the camera control unit 21 to the lens control unit 36 The aperture size of aperture 35 is detected by an aperture sensor not illustrated, and lens control unit 36 recognizes the current aperture size.
[0065] A lens memory 37 is provided to store an image plane motion coefficient K. The image plane motion coefficient K as used herein is a value that represents the correspondence relationship between the amount of lens triggering. of focus 33 and the amount of movement of an image plane, and can be a ratio defined by the amount of actuation of the focus lens 33 and the amount of movement of an image plane, for example. According to the present embodiment, the image plane motion coefficient can be obtained using Expression (1) below, for example, in which case as the image plane motion coefficient K increases, the quantity of movement of an image plane due to the actuation of the focus lens 33 also increases.
[0066] (Image plane motion coefficient K) = (image plane motion amount)/(focus lens trigger amount 33) ...(1)
[0067] In the camera 1 according to the present embodiment, even if the actuation amount of the focus lens 33 is equal, a lens position different from the focus lens 33 provides a different motion amount of an image plane. Similarly, even if the amount of focus lens actuation 33 is the same, a different lens position of the zoom lens 32 provides a different amount of motion than an image plane. That is, the image plane motion coefficient varies depending on the lens position on the optical axis of the focus lens 33 and additionally on the lens position on the optical axis of the zoom lens 32, and the lens control unit 36 according to the present embodiment, therefore, it operates to store the image plane motion coefficient, K, for each lens position of the focus lens 33 and for each lens position of the zoom lens 32.
[0068] FIGURE 6 presents a table that is stored in the memory of the lens 37 and illustrates the relationship between the lens position of the zoom lens 32 (focal length) and the lens position of the focus lens 33 (creating distance). image), and the image plane motion coefficient K. The table shown in FIGURE 6 is configured so that the actuation range of the zoom lens 32 is divided into nine segments from "f1" to "f9" in that order. from near end to infinite end while the focus lens drive range 33 is also divided into nine segments "D1" to "D9" in that order from near end to infinite end, to thereby store the coefficient of motion of K image plane corresponding to each lens position. For example, when the lens position of zoom lens 32 (focal length) is at "f1" and lens position of focus lens 33 (image creation distance) is at "D1", the motion coefficient of K image plane is "K11". In the example above, the table shown in FIGURE 6 is set up so that the trigger range of each lens is divided into nine segments, but the number of divisions is not particularly limited and can be set freely.
[0069] Referring to FIGURE 6, a maximum image plane motion coefficient Kmax and a minimum image plane motion coefficient Kmin will then be described.
[0070] The maximum image plane motion coefficient Kmax as used here is a value that corresponds to the maximum value of the image plane motion coefficient K. It is preferable that the maximum image plane motion coefficient Kmax varies depending on the current lens position of the zoom lens 32. It is also preferable that when the current lens position of the zoom lens 32 does not vary, the maximum image plane motion coefficient Kmax is a constant value (fixed value) even if the Current lens position of the 33-focus lens vary. It is, therefore, preferable that the maximum image plane motion coefficient Kmax be a fixed value (constant value) that is determined depending on the lens position of the zoom lens 32 (focal length) and that does not depend on the lens position of the focus lens 33 (image creation distance).
[0071] For example, in FIGURE 6, each of "K11", "K21", "K31", "K41", "K52", "K62", "K72", "K82" and "K91" in cells gray is the maximum image plane motion coefficient Kmax that represents a maximum value between the K image plane motion coefficients at each lens position of the 32 zoom lens (focal lengths). More specifically, as long as the lens position of the zoom lens 32 (focal length) is at "f1", "K11" as the image plane motion coefficient K when the lens position of the focus lens 33 (distance from image creation) is at "D1" between "D1" and "D9" is the maximum image plane motion coefficient Kmax representing maximum value. Therefore, "K11" as the K image plane motion coefficient when the lens position of the focus lens 33 (image creation distance) is at "D1" represents a maximum value between "K11" and "K19" that are the K-image plane motion coefficients when the respective lens positions (imaging distances) are at "D1" to "D9". In a similar way, as long as the lens position of the zoom lens 32 (focal length) is at "f2", "K21" as the image plane motion coefficient K when the lens position of the focus lens 33 ( imaging distance) is at "D1" also represents a maximum value between "K21" and "K29" which are the K image plane motion coefficients when the respective lens positions(imaging distances) state in "D1" to "D9". That is, "K21" is the maximum image plane motion coefficient Kmax. The same applies to the case in which the lens position of the 32 zoom lens (focal length) is in each of "f3" to "f9", in which case each of "K31", "K41", "K52" ", "K62", "K72", "K82" and "K91" in the gray cells is the maximum image plane motion coefficient Kmax,
[0072] In a similar way, the minimum image plane motion coefficient Kmin as used here is a value that corresponds to the minimum value of the image plane motion coefficient K. It is preferable that the image plane motion coefficient Minimum Kmin varies depending on the current lens position of the 32 zoom lens. It is also preferable that when the current lens position of the 32 zoom lens does not vary, the minimum picture plane motion coefficient Kmin is a constant value (value fixed) even if the current lens position of the focus lens 33 varies. For example, in FIGURE 6, each of "K19", "K29", "K39", "K49", "K59", "K69", "K79", "K89" and "K99" in the dashed cells is the minimum image plane motion coefficient Kmin which represents a minimum value between the K image plane motion coefficients at each lens position of the 32 zoom lens (focal lengths).
[0073] In such a way, as illustrated in FIGURE 6, the lens memory 37 stores: the K image plane motion coefficients corresponding to the respective lens positions of the zoom lens 32 (focal lengths) and respective lens positions of the focus lens 33 (image creation distances); the maximum image plane motion coefficient Kmax which represents a maximum value between the image plane motion coefficients K for each lens position of the zoom lens 32 (focal length); and the minimum image plane motion coefficient Kmin which represents a minimum value between the image plane motion coefficients K for each lens position of the zoom lens 32 (focal length).
[0074] Electrical contacts 403 provided in mount unit 401 of camera body 2 and electrical contacts 404 provided in mount unit 402 of lens barrel 3 are connected together to thereby electrically connect the lens control unit 36 with the camera control unit 21 via a lens transceiver unit 38 and a camera transceiver unit 29.
[0075] According to the present embodiment, the camera control unit 21 and the lens control unit 36 perform stationary communication with each other and also perform non-stationary communication as will be described later. In stationary communication, camera control unit 21 repeatedly transmits at a predetermined interval (e.g., tens of milliseconds to hundreds of milliseconds) a first request signal that requests lens information to lens control unit 36 via the camera transceiver unit 29 and the lens transceiver unit 38. After being initiated, the stationary communication may preferably be continued at the predetermined interval until the power is turned off.
[0076] Additionally, the camera control unit 21 transmits commands, such as to trigger the zoom lens 32, trigger the focus lens 33 and adjust the aperture size of aperture 35, to the lens control unit 36.
[0077] The lens control unit 36, in stationary communication, receives commands such as for adjusting the aperture size and performs the control based on the received commands. Lens control unit 36, when receiving the first request signal in stationary communication, repeatedly transmits lens information to camera control unit 21. Examples of lens information as used herein include information regarding position of the zoom lens 32, the position of the focus lens 33 and the aperture size of the aperture 35, etc. and a current position image plane motion coefficient Kcur. The current position image plane motion coefficient Kcur as used here is an image plane motion coefficient K that corresponds to the current zoom lens position (focal length) and the current focus lens position (creating distance). Image).
[0078] According to the present embodiment, the lens control unit 36 refers to the table that is stored in the lens memory 37 and represents the relationship between the lens positions (zoom lens position and focus lens position ) and the image plane motion coefficient K, thus to obtain the current position image plane motion coefficient Kcur that matches the current lens position of the zoom lens 32 and the current lens position of the focus lens 33.
[0079] In non-transient communication, which is different from the above stationary communication, the camera control unit 21 transmits a second request signal to request the transmission of the maximum image plane motion coefficient Kmax and the plane motion coefficient minimum image size Kmin. It is preferable that the above non-stationary communication is a communication that can be interrupted for the stationary communication. The lens control unit 36, when receiving the second request signal in non-stationary communication, transmits the maximum image plane motion coefficient Kmax and the minimum image plane motion coefficient Kmin to the camera control unit 21 .
[0080] The maximum image plane motion coefficient Kmax is transmitted when the second request signal is received in non-stationary communication, and differs from the image plane motion coefficient and current position Kcur that is transmitted when the first request signal request is received in stationary communication.
[0081] With reference to FIGURE 6, as long as the lens position of the zoom lens 32 (focus distance) is at "f1" and the lens position of the focus lens 33 (image creation distance) is at " D4", for example, the lens control unit 36 transmits "K14" as the current position image plane motion coefficient Kcur to the camera control unit 21 when it receives the first request signal from the lens control unit. camera 21 in stationary communication, and transition "K11" as the maximum image plane motion coefficient Kmax and "K19" as the minimum image plane motion coefficient Kmin to camera control unit 21 when receiving the second signal camera control unit 21 request signal in non-stationary communication.
[0082] On the other hand, in the camera body 2, the imaging device 22 that receives light beams L1 from the above optical imaging system is provided at a predetermined focal plane of the optical imaging system. In front of it, a shutter 23 is provided. The image creation device 22 is configured from a device, such as CCD and CMOS, which converts the optical signal received into an electrical signal to send the same to the camera control unit 21. The captured image information is sent to the camera control unit 21 is sequentially sent to a liquid crystal drive circuit 25 and is displayed in an electronic viewfinder (EVF) 26 of an optical viewing system. When a release button (not shown) provided on the operating unit 28 is fully depressed, the captured image information is recorded on the recording medium, i.e. a camera memory 24. The camera memory 24 can be any one of a detachable card type memory or built-in type memory. Details of the structure of the imaging device 22 will be described later.
[0083] The optical display system is provided in the camera body 2 to view the image captured by the image creation device 22. The optical display system in the present embodiment comprises the electronic viewfinder (EVF) 26 comprising a display element liquid crystal; the liquid crystal drive circuit 25 which drives the electronic viewfinder 26; and an eye lens 27. The liquid crystal trigger circuit 25 reads the captured image information that has been captured by the imaging device 22 and has been sent to the camera control unit 21, and uses it as the base for triggering. the electronic viewfinder 26. This allows the photographer to view the currently captured image through the ocular lens 27. Instead of the optical viewing system above using the L2 optical axis or in addition to it, it is also possible to provide a monitor of liquid crystal on the back surface of camera body 2, etc. and display the captured image on that LCD monitor.
[0084] The camera control unit 21 is provided in the camera body 2. The camera control unit 21, which is electrically connected to the lens control unit 36 through the lens transceiver unit 38 and the transceiver unit camera 29, transmits the first request signal in stationary communication to lens control unit 36 at an interval of tens of milliseconds to hundreds of milliseconds as described above, and receives lens information such as coefficient of motion. of current position image plane Kcur. Additionally, the camera control unit 21 transmits the commands for carrying out the adjustment of the aperture value, etc. for the lens control unit.
[0085] Additionally, the camera control unit 21, as described above, reads the pixel output from the imaging device 22, and processes the pixel output gone as needed by a predetermined information process to generate information of image, which is sent to the liquid crystal drive circuit 25 of the electronic viewfinder 26 and/or memory 24. Additionally, the camera control unit 21 controls the camera 1 as a whole, such as correcting the image information a from the imaging device 22 and detecting the focus adjustment state of lens barrel 3 and aperture adjustment state, etc.
[0086] Additionally, the camera control unit 21, in addition to the above, uses the pixel data read from the image creation apparatus 22 as the basis for detecting a focus adjustment state of the optical system. imaging by a phase difference detection system and detection of a focus adjustment state of the optical imaging system by a contrast detection system. The specific method of detecting the focus adjustment state will be described later.
[0087] The operating unit 28 includes a shutter release button and input switches, such as a moving image creation start switch, for the photographer to configure various operating modes of the camera 1, and is designed to allow for switching auto focus mode/manual focus mode and switching still image creation mode/moving image creation mode. The various modes determined through the operation unit 28 are sent to the camera control unit 21, which controls the operation of the camera 1 as a whole. The shutter-release button includes a first switch SW1 that is turned on by mid-press of the button and a second switch SW2 that is turned on by full-press of the button.
[0088] The imaging device 22 according to the present embodiment will now be explained.
[0089] FIGURE 2 is a front elevation view illustrating an imaging plane of the imaging device 22, and FIGURE 3 is a front elevation view extending area III of FIGURE 2 to schematically illustrate the array of focus detection pixels 222a to 222b.
[0090] The imaging device 22 of the present embodiment, as illustrated in FIGURE 3, is configured so that a plurality of imaging pixels 221 are arranged two-dimensionally in the plane of the imaging plane, that is. , green G pixels having color filters that pass the wavelength region of the green color, red R pixels having color filters that pass the wavelength region of the red color, and blue B pixels having color filters that pass the wavelength region of the blue color, are arranged in the so-called "Bayer array". That is, in each 223 group of four adjacent pixels (packaged tightly in a square lattice set), two green pixels are arranged on one diagonal, while one red pixel and one blue pixel are arranged on the other diagonal. By using such groups 223 of pixels arranged in a Bayer array as units and arranging such groups 223 of pixels in the imaging plane of the imaging device 22 repeatedly two-dimensionally, the imaging device 22 is configured .
[0091] The set in unit pixel group 223 may also be a tightly packed hexagonal lattice set instead of the illustrated tightly packed square truss, for example. The configuration and set of color filters are not limited to the above. It is also possible to use a set of complementary colored filters (green: G, yellow: Ye, magenta: Mg and cyan: Cy).
[0092] FIGURE 4A is a front elevation view illustrating one of the imaging pixels 221 enlarged, while FIGURE 4D is a cross-sectional view thereof. An imaging pixel 221 is configured from a microlens 2211, a photovoltaic conversion unit 2212, and a color filter not illustrated. As illustrated in the cross-sectional view of FIGURE 4D, the photovoltaic conversion unit 2212 is embedded in the surface of a semiconductor circuit board 2213 of the imaging device 22, while the microlens 2211 is formed on the surface. The 2212 photovoltaic conversion unit is formatted to use the 2211 microlens to receive beams of imaging light passing through an exit pupil (eg F1.0) of the optical imaging system, and thereby receives the image creation beams.
[0093] Additionally, at the center of the imaging plane of the imaging apparatus 22 and at the left and right symmetrical positions of the center, that is, at three locations, the focus detection pixel strings 22a, 22b and 22c are provided, each of the focus detection pixels 222a and 222b are arranged as substitutes for the above-described imaging pixels 221. As illustrated in FIGURE 3, a focus detection pixel string is configured so that a The plurality of focus detection pixels 222a and 222b are disposed adjacent to each other alternatively in a horizontal strand (22a, 22b, 22c). In the present embodiment, the focus detection pixels 222a and 222b are densely arranged with no spaces at the positions of the green G pixels and blue B pixels of the imaging pixels 221 arranged in a Bayer array.
[0094] The positions of the focus detection pixel strings 22a to 22c illustrated in FIGURE 2 are not limited to the illustrated positions. Beads can be arranged in any single location or two locations, or four or more locations. Additionally, during actual focus detection, the photographer can also manually operate the operating unit 28 to select a desired focus detection pixel string as the focus detection area from the plurality of arranged focus detection pixel strings. 22a to 22c.
[0095] FIGURE 4B is a front elevation view illustrating one of the focus detection pixels 222a enlarged, while FIGURE 4E is a cross-sectional view of the focus detection pixel 222a. FIGURE 4C is a front elevation view illustrating one of the focus detection pixels 222b enlarged, while FIGURE 4F is a cross-sectional view of the focus detection pixel 222b. Focus detection pixel 222a, as illustrated in FIGURE 4B, is configured with a microlens 2221a and a semicircular shaped photoelectric conversion unit 2222a. As illustrated in the cross-sectional view of FIG., the photoelectric conversion unit 2222a is embedded in the surface of a semiconductor circuit board 2213 of the imaging apparatus 22, while the microlens 2221a is formed in the surface. Focus detection pixel 222b as illustrated in FIGURE 4C is configured from a microlens 2221b and a photoelectric conversion unit 2222b. As illustrated in the cross-sectional view of FIGURE 4F, the photoelectric conversion unit 2222b is embedded in the surface of a semiconductor circuit board 2213 of the imaging apparatus 22, while the microlens 2221b is formed on the surface. These focus detection pixels 222a and 222b, as illustrated in FIGURE 3, are disposed mutually adjacent to each other in a horizontal string to thereby form the focus detection pixel strings 22a through 22c illustrated in FIGURE 2.
[0096] Photoelectric conversion units 2222a and 2222b of focus detection pixels 222a and 222b are formatted to use microlenses 2221a and 2221b to receive light beams passing through a predetermined region (eg F2.8 ) of the exit pupil of the optical imaging system. The focus detection pixels 222a and 222b are not provided with color filters, so their spectral characteristics are combinations of the spectral characteristics of the photodiodes that perform the photoelectric conversion and the spectral characteristics of the not-illustrated infrared cut filters. Note, however, that each pixel can also be configured to comprise one of the same color filters as the imaging pixels 221, e.g., the green filter.
[0097] The photoelectric conversion units 2222a and 2222b of the focus detection pixels 222a and 222b illustrated in FIGURE 4B and FIGURE 4C are made of semicircular shapes, but the shapes of the photoelectric conversion units 2222a and 2222b are not limited to this. Other shapes, eg oval shapes, rectangular shapes and polygonal shapes can also be used.
[0098] The description will now be directed to the so-called "phase difference detection system" which detects the focus adjustment state of the optical image creation system based on the pixel outputs of the focus detection pixels described above 222a and 222b.
[0099] FIGURE 5 is a cross-sectional view along line VV of FIGURE 3, and illustrates that focus detection pixels 222a-1, 222b-1, 222a-2 and 222b-2 disposed near the optical axis of L1 imaging and adjacent to each other receive light beams AB1-1, AB2-1, AB1-2 and AB2-2, respectively, which are emitted from the distance measuring pupils 351 and 352 of the exit pupil 350. In FIGURE 5, among the plurality of focus detection pixels 222a and 222b, only those positioned near the optical imaging axis L are illustrated as examples, but focus detection pixels other than those illustrated in FIGURE 5 are similarly configured to receive the respective beams of light from the pair of distance measuring pupils 351 and 352.
[00100] The "output pupil 350" as used herein is an image that is configured at the position of distance d in front of the microlenses 2221a and 2221b of the focus detection pixels 222a and 222b arranged in the predetermined focus plane of the optical system of image creation. Distance D is the unambiguous value determined according to the curvature and refractive index of the microlens and the distance between the microlens and the photoelectric conversion unit, etc. This distance D is referred to as the "distance measurement pupil distance". The "distance measuring pupils 351 and 352" as used herein are images of the photoelectric conversion units 2222a and 2222b which are respectively projected by microlenses 2221a and 2221b from the focus detection pixels 222a and 222b.
[00101] In FIGURE 5, the array direction of the focus detection pixels 222a-1, 222b-1, 222a-2, and 222b-2 matches the array direction of the distance measuring pupil pair 351 and 352.
[00102] As illustrated in FIGURE 5, the microlenses 2221a-1, 2221b-1, 2221a-2 and 2221b-2 of the focus detection pixels 222a-1, 222b-1, 222a-2 and 222b-2 are arranged close together. of the predetermined focal plane of the optical imaging system. When the shapes of photoelectric conversion units 2222a-1, 2222b-1, 2222a-2 and 2222b-2 arranged behind the microlenses 2221a-1, 2221b-1, 2221a-2, 2221b-2 are projected onto the exit pupil 350 that is separated from the 2221a-1, 2221b-1, 2221a-2 and 2221b-2 microlenses by exactly the distance measurement distance D, the shapes projected from the distance measurement pupils 351 and 352.
[00103] In other words, the rela- tive position relationships of the microlenses and the photoelectric conversion units in the focus detection pixels are presented so that the projected formats (distance measuring pupils 351 and 352) of the units Photoelectric conversion rates of the focus detection pixels combine in the exit pupil 350 at the distance measuring distance D, and the projection directions of the photoelectric conversion units on the focus detection pixels are thus determined.
[00104] As illustrated in FIGURE 5, the photoelectric conversion unit 2222a-1 of the focus detection pixel 222a-1 sends a signal corresponding to the intensity of an image formed on the microlens 2221a-1 by the AB1-1 light beam which passes through the distance measuring pupil 351 and goes towards the microlens 2221a-1. Similarly, the photoelectric conversion unit 2222a-2 of the focus detection pixel 222a-2 sends a signal corresponding to the intensity of an image formed on the microlens 2221a-2 by the AB1-2 light beam passing through the measuring pupil away 351 and goes in the direction of microlens 2221a-2.
[00105] The photoelectric conversion unit 2222b-1 of the focus detection pixel 222b-1 sends a signal corresponding to the intensity of an image formed on the microlens 2221b-1 by the AB2-1 light beam passing through the measuring pupil. distance 352 and goes in the direction of microlens 2221b-1. Similarly, the photoelectric conversion unit 2222b-2 of the focus detection pixel 222b-2 sends a signal corresponding to the intensity of an image formed on the microlens 2221b-2 by the AB2-2 light beam passing through the measuring pupil of distance 352 and goes in the direction of microlens 2221b-2.
[00106] By arranging the two types described above of focus detection pixels 222a and 222b in a straight line as illustrated in FIGURE 3 and grouping the outputs of photoelectric conversion units 2222a and 2222b of the focus detection pixels 222a and 222b in respective output groups corresponding to the distance measuring pupils 351 and 352, data are obtained relating to the intensity distributions of the pair of images that the focus detection beams pass through the distance measuring pupils 351 and 352 form in the focus detection pixel strands. Such intensity distribution data can be processed by the image shift detection operation, such as the correlation operation or phase difference detection, to thereby detect an image shift amount by the so-called difference detection system. of phase.
[00107] Additionally, by processing the amount of image deviation obtained using the conversion operation depending on the interval between the centers of gravity of the pair of distance measuring pupils, it is possible to find the deviation of the current focal plane with respect to the plane. predetermined focal (focal plane in the focus detection area corresponding to the position of the microlens array in the predetermined focal plane), that is, the amount of out-of-focus.
[00108] The calculation of the image shift amount using the phase difference detection system and the calculation of the out-of-focus amount based on this are performed by the camera control unit 21.
[00109] Additionally, the camera control unit 21 reads the outputs of the imaging pixels 221 from the imaging device 22 and uses the read pixel outputs as a basis to calculate a focus evaluation value. Such a focus evaluation value can be obtained, for example, by extracting high frequency components from the image outputs of the imaging pixels 221 of the imaging device 22 using a high-frequency pass filter. In an alternative embodiment, it can be achieved by using two high-frequency pass filters with different cutoff frequencies to extract the high-frequency components.
[00110] The camera control unit 21 then sends a trigger signal to the lens control unit 36 to trigger the focus lens 33 at a predetermined sampling interval (distance), thus obtaining focus evaluation values in different positions and finding the position of the focus lens 33 where the focus evaluation value is maximum as a focused position, that is, performing the focus detection by the contrast detection system. This focused position can be obtained, for example, when calculating the focus evaluation values while triggering the focus lens 33, by interpolation or other suitable operation using those focus evaluation values which assume a value that over doubles and then falls the double.
[00111] An example of the operation of camera 1 according to the present embodiment will then be described with reference to FIGURE 7. FIGURE 7 is a flowchart illustrating an example of the operation of camera 1 according to the present embodiment. The following operation is initiated by the power of camera 1 being turned on.
[00112] First, in step S101, the camera control unit 21 starts calculating the out-of-focus amount using the phase difference detection system. According to the present embodiment, the calculation process for the out-of-focus amount using the phase difference detection system is carried out as follows. That is, the camera control unit 21 first reads a pair of image data corresponding to a pair of images of the focus detection pixels 222a and 222b that constitute each of the three focus detection pixel strings 22a to 22c of the image creation device 22. In this case, a setting is also possible so that when manual operation by the photographer selects a specific focus detection position, only the focus detection pixel data corresponding to the detection position is read . The camera control unit 21 then uses the read pair of image data as the basis to perform image shift detection processing (correlation processing), and calculates an image shift amount at the corresponding focus detection position. to each of the three out-of-focus detection pixel strings 22a to 22c, which is further converted to out-of-focus amount. Additionally, the camera control unit 21 performs the reliability evaluation of the calculated out-of-focus amount. The evaluation of the reliability of the out-of-focus amount can, for example, be carried out on the basis of the degree of combination of the image data pair and/or contrast, etc. Such out-of-focus amount calculation processing using the phase difference detection system is performed repeatedly at a predetermined interval.
[00113] In step S102, the camera control unit 21 starts a calculation process for the focus evaluation value using the contrast detection system. According to the present embodiment, the calculation process for the focus evaluation value is performed by reading the pixel outputs of the image creation pixels 221 of the image creation device 22, extracting the high frequency components from the outputs. pixel read using a high frequency pass filter, and accumulating them. If a specific focus detection position is selected by manual operation by the photographer, another setting may also be possible so that pixel outputs are read only from the 221 image creation pixels corresponding to the focus detection position selected for calculate the focus evaluation value. The calculation process for the focus evaluation value is performed repeatedly at a predetermined interval.
[00114] According to the present modality, in step S101, at a timing when the phase difference detection system starts the calculation of the out-of-focus amount or at a time when the contrast detection system starts a process of calculation for the focus evaluation value, or after they have been started, stationary communication is initiated between the camera control unit 21 and the lens control unit 36, and a process is performed repeatedly at a predetermined interval so that the lens control unit 36 transmits to the camera control unit 21 the lens information including the current position image plane motion coefficient Kcur corresponding to the current lens position of the zoom lens 32 and the position of current lens of focus lens 33.
[00115] In step S103, camera control unit 21 makes a determination as to whether or not the shutter-release button provided in operation unit 28 has been pressed halfway (first switch SW1 turned on). If the first switch SW1 is turned on, then the routine proceeds to step S104, while on the other hand, if the first switch SW1 is not turned on, then the routine waits at step S103 where the calculation of the out-of-focus amount and the calculation of the focus evaluation value and the further acquisition of the lens information using the stationary communication are carried out repeatedly until the first switch SW1 is turned on.
[00116] In step S104, the camera control unit 21 transmits the second request signal in non-stationary communication, and the lens control unit 36, after receiving the second request signal in non-stationary communication from the unit camera control unit 21, refers to the table (see FIGURE 6) stored in the lens memory 37 for transmitting to the camera control unit 21 the maximum image plane motion coefficient Kmax, and the maximum image plane motion coefficient of minimum image Kmin that corresponds to the current lens position of the zoom lens 32. The camera control unit 21 thus receives the maximum image plane motion coefficient Kmax and the minimum image plane motion coefficient Kmin.
[00117] In step S105, the camera control unit 21 performs a determination of whether or not the out-of-focus amount was able to be calculated using the phase difference detection system. If the out-of-focus amount can be calculated, then the routine proceeds to step S111, while on the other hand, if the out-of-focus amount cannot be calculated, then the routine proceeds to step S106. It is noted that, according to the present modality, although the out-of-focus amount can be calculated, cases where the out-of-focus amount calculated has low reliability are treated as the out-of-focus amount cannot be calculated , and the routine should proceed to step S106. According to the present modality, the reliability of the out-of-focus amount can be determined to be low if the object contrast is low, the object is a very low brightness object, the object is a very high brightness object, by example.
[00118] The above determination in step S105 is made using a result of the most recent one-time out-of-focus amount calculation process, but an alternative mode can be configured so that if the out-of-focus amount cannot successively be calculated or the reliability of the out-of-focus amount is successively low in the most recent predetermined number of out-of-focus amount calculation processes, then the distance measurement is determined to be not possible and the routine proceeds for step S106, while in contrast, if at least an out-of-focus amount can be calculated in the most recent predetermined number of out-of-focus amount calculation processes, then the distance measurement is determined to be possible and the routine proceeds to step S111.
[00119] If, in step S105, the out-of-focus amount is determined to be able to be calculated so that the distance measurement has been determined as possible, then the routine proceeds to step S111 where the focus trigger is performed with based on the amount of out-of-focus calculated using the phase difference detection system. Specifically, the camera control unit 21 calculates, from the out-of-focus amount calculated using the phase difference detection system, a lens trigger amount that is required to trigger the focus lens 33 for the focused position, which is sent to the focus lens drive motor 331 via the lens control unit 36. This allows the focus lens drive motor 331 to drive the focus lens 33 to the focused position based on the lens trigger amount calculated by camera control unit 21.
[00120] It is noted that, according to the present modality, even when the focus lens drive motor 331 is driven to drive the focus lens 33 to the focused position, the camera control unit 21 performs the calculation repeatedly of the out-of-focus amount using the phase difference detection system, so that if a new out-of-focus amount is calculated, then the camera control unit 21 triggers the focus lens 33 based on the new amount of lack of focus.
[00121] Then, in step S106, the camera control unit 21 uses the maximum image plane motion coefficient Kmax acquired in step S104 to perform a process of determining a scanning drive speed V which is a speed of drive for the focus lens 33 in a scan operation. The "scan operation" as used here is an operation in which the camera control unit 21 simultaneously performs the calculation of the out-of-focus amount using the difference detection system and the calculation of the focus evaluation value using the system of contrast detection at a predetermined interval while driving the focus lens 33 using the focus lens drive motor 331 at the scanning drive speed V determined in step S106, to thereby simultaneously and parallel perform the detection of a focused position using the phase difference detection system and the detection of a second focused position using the contrast detection system at a predetermined interval.
[00122] In this scanning operation, when the detected focused position is performed using the contrast detection system, the camera control unit 21 calculates the focus evaluation values at a predetermined sampling interval while actuating the focus lens 33 for scanning, and detects a lens position at which the calculated focus evaluation value is a peak, such as the focused position. Specifically, the camera control unit 21 triggers the focus lens 33 for scanning to move an image plane of the optical system in the direction of the optical axis to thereby calculate focus evaluation values on different image planes. , and detects a lens position in which the focus evaluation value is at a peak, such as the focused position. If, however, the image plane movement speed is unduly high, then the range of image planes for calculating the focus evaluation values becomes excessively large, so that the focused position may not be properly detected . In particular, the image plane motion coefficient K representing the amount of motion of an image plane for the actuation amount of the focus lens 33 varies depending on the lens position on the optical axis of the focus lens 33, and, therefore, even when the focus lens 33 is driven at a constant speed, some lens positions of the focus lens 33 cause the movement speed of an image plane to be unduly high, and the range of image planes to calculating focus evaluation values in this way becomes excessively large so that the focused position may not be properly detected.
[00123] Therefore, according to the present modality, the camera control unit 21 uses the maximum image plane motion coefficient Kmax acquired in step S106 as the basis for calculating the digitization drive speed V at the time of 33 focus lens drive for scanning. The camera control unit 21 uses the maximum image plane motion coefficient Kmax to calculate the scan drive speed V so that it is a maximum drive speed capable of being used to properly detect the focused position using the scanning system. contrast detection.
[00124] Then, in step S107, the scanning operation is started using the scanning drive speed V determined in step S106. Specifically, the camera control unit 21 sends a scan trigger initiation command to the lens control unit 36, which uses the command with the base to trigger the focus lens drive motor 331 so that the lens focus 33 is triggered to scan at the scan trigger speed V determined in step S106. The camera control unit 21 then operates to read a pair of image data corresponding to a pair of images from the focus detection pixels 222a and 222b of the image creation device 22 at a predetermined interval while actuating the focus lens 33 at the V scan trigger speed; use the read data as the basis to perform the out-of-focus amount calculation using the phase difference detection system and evaluation of the reliability of the calculated out-of-focus amount, read the pixel outputs of the image creation pixels 221 of the imaging device 22 at a predetermined interval while driving the focus lens 33 at the scanning drive speed V and using the read pixel outputs as the bases for calculating and acquiring focus evaluation values at different positions of focus lens to thereby perform detection of the focused position using the contrast detection system.
[00125] Then, in step S108, the camera control unit 21 makes a determination as to whether or not the out-of-focus amount can be calculated using the phase difference detection system as a result of the digitizing operation. If the out-of-focus amount can be calculated, then the distance measurement is determined to be possible and the routine proceeds to step S111, while on the other hand, if the out-of-focus amount cannot be calculated, then distance measurement is determined not to be possible and the routine proceeds to step S109. Note that, also in step S108, as in step S105, although the out-of-focus quantity can be calculated, cases in which the calculated out-of-focus quantity has low reliability are treated as if the out-of-focus quantity could not be calculated, and the routine proceeds to step S109.
[00126] In step S109, the camera control unit 21 performs a determination of whether or not a focused position can be detected using the contrast detection system as a result of the scanning operation. If the focused position has been detected using the contrast detection system, then the routine proceeds to step S112, whereas, on the other hand, if the focused position has not been detected, then the routine proceeds to step S110.
[00127] At step S110, the camera control unit 21 makes a determination of whether or not the scanning operation has been performed for the entire actuable range of the focus lens 33. If the scanning operation has not been performed for the entire actionable range of the focus lens 33, then the routine returns to step S108, and steps S108 to S110 are repeated thus continuing to perform the digitizing operation, that is, an operation to simultaneously perform the out-of-focus amount calculation using the phase difference detection system and the detection of the focused position using the contrast detection system at a predetermined interval while triggering the focus lens 33 for digitization. If, on the other hand, the scanning operation is completed for the entire actuable range of the focus lens 33, then the routine proceeds to step S113.
[00128] As a result of the executed digitizing operation, if the determination has been made in step S108 that the out-of-focus amount can be calculated using the phase difference detection system, then after processing to stop the In scanning operation, the routine proceeds to step S111 in which the focus drive is performed as described above to drive the focus lens 33 to the detected focused position using the phase difference detection system.
[00129] Additionally, as a result of the performed scanning operation, if the determination has been made in step S109 that the focused position can be detected using the contrast detection system, then after processing to stop the digitizing, the routine proceeds to step S112 in which the camera control unit 21 performs focus drive to drive the focus lens 33 to the detected focused position using the contrast detection system.
[00130] If the focus lens 33 drive is completed after the focus lens 33 drive for the focused position detected using the phase difference detection system or for the focused position detected using the contrast detection system, then the completed focus is displayed through the electronic viewfinder 26.
[00131] If, on the other hand, the determination has been made in step S110 that the execution of the scanning operation has been completed for the entire operable range of the focus lens 33, then the routine proceeds to step S113. In step S113, processing is performed to terminate the scanning operation since as a result of the scanning operation performed, the focus position was not able to be detected using the contrast detection system, and after that, the focus being impossible to be displayed. The display of focus being impossible is performed using the electronic viewfinder 26, for example.
[00132] As described above, according to the present embodiment, the maximum image plane motion coefficient Kmax, which represents a maximum image plane motion coefficient among a plurality of image plane motion coefficients K stored for the respective positions of the focus lens 33, is acquired from the lens control unit 36. The camera control unit 21 uses the maximum image plane motion coefficient Kmax to calculate a scan drive speed V of mode that it is a maximum drive speed among those capable of being used to properly detect the focused position using the contrast detection system, and thus the calculation interval for the focus evaluation values (interval of image planes for calculate focus evaluation values) has a suitable value for focus detection even if the focus lens 33 is triggered to scan to a the position at which the image plane motion coefficient K is a maximum value (for example, a value equal to the maximum image plane motion coefficient Kmax).
[00133] This allows the focused position to be properly detected using the contrast detection system according to the present invention even if the image plane motion coefficient K becomes large (for example, a case of being the coefficient of maximum image plane motion Kmax) as a result of the image plane motion coefficient K varies as the focus lens 33 is driven in the optical geometry axis direction.
[00134] The modality described above exemplifies a configuration in which the maximum image plane motion coefficient Kmax, which represents a maximum image plane motion coefficient among a plurality of image plane motion coefficients K stored for the positions respective of the focus lens 33, is acquired from the lens barrel 3, and the scanning operation is performed using the scanning speed V which is the maximum drive speed for the focus lens 33 which allows detection focus is properly performed using the contrast detection system even if the image plane motion coefficient K at the time of focus lens actuation 33 is equal to the acquired maximum image plane motion coefficient Kmax, but the present invention it is not limited to this configuration and another configuration can be employed as well as below, for example.
[00135] That is, a coefficient larger of the two coefficients is acquired as a predetermined image plane motion coefficient Kpre from lens barrel 3, where one of the two coefficients is a first image plane motion coefficient K1 which corresponds to a first position on the end side near the current lens position of the focus lens 33 while the other is a second image plane motion coefficient K2 which corresponds to a second position on the infinity side of the current lens position of the focus lens 33. In this case, a setting can be employed so that the scan operation is performed using a scan speed V which is the maximum drive speed for the focus lens 33 that allows the Focus detection is properly performed using the contrast detection system even if the image plane motion coefficient K at the time of lens actuation d and focus 33 is the predetermined image plane motion coefficient Kpre when the digitizing operation is performed.
[00136] Or, if a predetermined image plane motion coefficient Kpre that corresponds to a predetermined lens position of the focus lens 33 is greater than the image plane motion coefficient Kcur at the current lens position of the lens of focus 33, then the predetermined image plane motion coefficient Kpre must be acquired from the lens barrel 3. In that case, a setting can be employed so that the scanning operation is performed using a scanning speed V which is the maximum drive speed for the focus lens 33 which allows focus detection to be properly performed using the contrast detection system even if the image plane motion coefficient K at the time of focus lens drive 33 is the predetermined image plane motion coefficient acquired Kpre when the digitizing operation is performed.
[00137] An alternative configuration can be employed so that the operation according to the modality described above is performed only when a high magnification zoom lens is used as the lens barrel 3. A high magnification zoom lens has a tendency for the image plane motion coefficient to become high, and the accuracy in detecting the focused position using the contrast detection system can thus be improved compared to the conventional technique. Second Mode
[00138] A second embodiment according to the present invention will then be described. The second mode has the same configuration as the first mode described above except that camera 1 illustrated in FIGURE 1 operates as described below.
[00139] That is, the second mode has an additional feature that, in the flowchart illustrated in FIGURE 7, after the focused position can be detected in step S109 using the detection and contrast system, when performing in step S112 the triggering of Focusing with Bse on the result of the contrast detection system, a determination is made as to whether or not the clearance reduction trigger takes place, and this determination is used as the basis for changing the trigger scheme for the backlash lens. focus 33 at the moment of performing the focus activation of the scheme in the first modality described above, therefore, in this aspect, the second modality differs from the first modality, but other characteristics are the same as those of the first modality.
[00140] In general, the focus lens drive motor 331 to drive the focus lens 33 as illustrated in FIGURE 1 is configured from a mechanical drive transmission mechanism which, for example, comprises a first drive mechanism 500 and a second drive mechanism 600 as illustrated in FIGURE 8, and is configured so that the first drive mechanism 500 is driven to drive the second drive mechanism 600 on the side of the focus lens 33 to thereby move the 33 focus lens for near-end side or infinity-end side. In such a drive transmission mechanism, an amount of backlash G is normally provided in view of the smooth operation of the engaging parts of the gears. In the contrast detection system, however, due to its mechanism, the focus lens 33 may need to be actuated as illustrated in (A) and (B) of FIGURE 9, so that the focus lens 33 passes once through. from the focus position in the scanning operation and then move to the focus position after reversing the trigger direction. Thus, the characteristic in this case is such that if the drive for backlash reduction is not performed as illustrated in (B) of FIGURE 9, then the lens position of the focus lens 33 is changed exactly by the amount of backlash G For this reason, in order to eliminate such an effect due to the amount of clearance G, as illustrated in (A) in FIGURE 9, when performing the focus drive for the focus lens 33, it may be necessary to perform the drive for backlash reduction where the focus lens 33 passes once through the focused position and is then driven to the focused position by reversing the drive direction again.
[00141] FIGURE 9 is a set of diagrams illustrating a relationship between the focus lens position and the focus evaluation value and the relationships between the focus lens position and the time when the scanning operation and the focus triggering based on the contrast detection system are performed according to the present modality. (A) of FIGURE 9 illustrates an aspect that, after initiation at time t0 the scanning operation for the lens and focus 33 from the lens position P0 in the direction from the infinity-end side to the near-end side, if the peak position (focused position) P2 of the focus evaluation value is detected at the moment when the focus lens 33 is moved to the lens position P1 at the time t1, then the scanning operation is stopped and the focus trigger is performed together with the clearance reduction drive to thereby drive the focusing lens 33 to the focused position at time t2. On the other hand, (B) of FIGURE 9 illustrates an aspect that, after initiation at time t0 the scanning operation likewise, the scanning operation is interrupted at time t1 and focus triggering is performed without triggering. of backlash reduction, to thus trigger the focusing lens 33 to the focused position at time t3.
[00142] An example of the operation according to the second modalities will now be described with reference to the flowchart illustrated in FIGURE 10. The operation below is performed if the focused position has been detected using the contrast detection system in step S109 in the flowchart described above illustrated in FIGURE 7. This is, as illustrated in (A) and (B) of FIGURE 9, after initiation of the scanning operation from time t0, if the peak position (focused position) P2 of the evaluation value of focus is detected at the moment the focus lens 33 is moved to the lens position P1 at time t1, then the operation is performed from time t1.
[00143] More specifically, if the focused position is detected using the contrast detection system, then the camera control unit 21 performs in step S201 the acquisition of the current position image plane motion coefficient Kcur at the current position of the zoom lens 32 and the current position of the focus lens 33. For example, with reference to (A) and (B) of FIGURE 9, a current image plane motion coefficient K corresponding to lens position P1 at time t0 is acquired as the current position image plane motion coefficient Kcur. The current position image plane motion coefficient Kcur can be acquired from the lens control unit 36 through the lens transceiver unit 38 and the camera control unit 21 using the stationary communication described above being performed between the camera control unit 21 and the lens control unit 36.
[00144] Then, in step S202, the camera control unit 21 performs the acquisition of information regarding the amount of backlash G (see FIGURE 8) from the drive transmission mechanism to the focus lens 33. The amount of backlash G of the drive transmission mechanism to the focusing lens 33 can be acquired, for example, by preliminary storing the same in the lens memory 37 provided in the lens barrel 3 and referring to the same. More specifically, the camera control unit 21 sends a transmit request for the amount of clearance G from the drive transmission mechanism to the focus lens 33 to the lens control unit 36 via the camera transceiver unit 29 and the lens transceiver unit 38 so that lens control unit 36 transmits the amount of clearance G from the drive transmission mechanism to the focus lens 33 stored in lens memory 37. An alternative embodiment may also be possible so that information regarding the amount of clearance G from the drive transmission mechanism to the focus lens 33 stored in lens memory 37 is incorporated into the lens information to be transmitted and received in the above-described stationary communication being carried out between the lens unit. camera control 21 and the lens control unit 36.
[00145] Then, in step S203, the camera control unit 21 calculates an IG image plane motion amount corresponding to the amount of slack G based on the current position image plane motion coefficient described above Kcur acquired in step S201 and the information described above regarding the amount of clearance G from the drive transmission mechanism for the focus lens 33 acquired in step S202. The amount of IG image plane motion corresponding to the amount of backlash G is an amount of motion of the image plane when the focusing lens is triggered by exactly the same amount as the amount of backlash G, and can be calculated according to Expression (2) below in this modality.
[00146] Amount of IG image plane motion corresponding to amount of backlash G) = (amount of backlash G) x (image plane motion coefficient of current position Kcur) ...(2)
[00147] Then, in step S204, the camera control unit 21 performs a process of comparing the image plane motion amount described above IG corresponding to the amount of slack G calculated in step S203 with a plane motion amount of IP predetermined image, and the result of this comparison is used to make a determination as to whether the IG image plane motion amount corresponding to the slack amount G is not greater than the IP predetermined image plane motion amount , that is, whether a condition of (amount of motion of IG image plane corresponding to amount of slack G) < (amount of motion of predetermined image plane IP) is satisfied or not. The IP default image plane motion amount can be set to match the focal depth of the optical system and is usually an image plane motion amount that matches the focal depth. An alternative embodiment may also be possible so that the IP predetermined image plane motion amount is properly configured depending on the F-value, cell size of the imaging device 22, the format of an image to be captured, etc. since the predetermined image plane motion amount IP is set to match the focal depth of the optical system. Specifically, the IP predetermined image plane motion amount can be set to a larger value as the F value increases. Alternatively or additionally, the IP predetermined image plane motion amount can be set to a larger value as the cell size of the imaging device 22 increases or the image shape is reduced. If the IG image plane motion amount corresponding to the slack amount G is not greater than the predetermined image plane motion amount IP, then the routine proceeds to step S205. If, on the other hand, the IG picture plane motion amount corresponding to the slack amount G is not greater than the predetermined picture plane motion amount IP, then the routine proceeds to step S205. If, on the other hand, the IG picture plane motion amount corresponding to the slack amount G is greater than the predetermined picture plane motion amount IP, then the routine proceeds to step S206.
[00148] In step S205, it was determined in step S204 described above that the IG picture plane motion amount corresponding to the amount of slack G is not greater than the predetermined image plane motion amount IP, if not which it is determined that the lens position of the focus lens 33 after actuation may fall within the focal depth of the optical system even without the backlash reduction actuation and that the backlash reduction actuation is not performed at the time of actuation of focus, and this determination is used as the basis for performing the focus trigger without the backlash reduction trigger. That is, a determination is made that the focus lens 33 is driven directly to the focus position at the time of the focus triggering, and this determination is used as the basis for performing the focus triggering without the triggering of slack reduction, as illustrated in (B) in FIGURE 9.
[00149] In step S206, on the other hand, it was determined in step S204 described above that the image plane motion amount IG corresponding to the amount of slack G is greater than the predetermined image plane motion amount IP, case in which it is determined that the lens position of the focus lens 33 after actuation cannot fall within the focal depth of the optical system if the backlash reduction drive is not performed and that the backlash reduction drive must be performed at the time of the focus trigger, and this determination is used as the basis for performing the focus trigger in conjunction with the backlash reduction trigger. That is, a determination is made that, at the time of focus triggering, the focus lens 33 is triggered to pass once through the focused position and then triggered to the focused position by reversing again the trigger direction and this determination is used as the basis for performing the focus drive together with the backlash reduction drive, as illustrated in (A) of FIGURE 9.
[00150] According to the second mode, as described above, the current position image plane motion coefficient Kcur and the information regarding the amount of clearance G from the drive transmission mechanism to the focus lens 33 are used as the basis for calculating the IG image plane motion amount corresponding to the amount of slack G, and a determination is made as to whether the calculated IG image plane motion amount corresponding to the amount of slack G is not greater than the amount of predetermined image plane motion IP corresponding to the focal depth of the optical system, to thereby determine whether or not the backlash reduction trigger is performed at the time of the focus trigger performance. As a result of the determination, if the IG image plane motion amount corresponding to the G clearance amount is not greater than the IP predetermined image plane motion amount corresponding to the focal depth of the optical system and the lens position of the lens of focus 33 after the trigger can therefore fall within the focal depth of the optical system, then the clearance reduction trigger is not performed, while on the other hand, if the amount of IG image plane motion corresponding to the amount of clearance G is greater than the amount of motion of predetermined image plane IP corresponding to the focal depth of the optical system and the lens position of the focus lens 33 after triggering, so it cannot fall within the focal depth of the optical system without the slack reduction trigger, then the slack reduction trigger is performed. Therefore, according to the present modality, if the backlash reduction drive is not necessary, then the backlash reduction drive is not performed, so the time required for the focus drive can be reduced, and the relevant time for the focus operation can thus be reduced. On the other hand, if backlash reduction triggering is required, then backlash reduction triggering is carried out and the focusing accuracy can thereby be improved.
[00151] In particular, according to the second modality, the K image plane motion coefficient, which varies depending on the lens position of the zoom lens 32 and the lens position of the focus lens 33, is used to calculate the IG image plane motion amount corresponding to the amount of slack G, which is compared to the predetermined image plane motion amount IP corresponding to the focal depth of the optical system, and it may thus be possible to properly determine whether the clearance reduction trigger at the time of focus is necessary or not. Third Mode
[00152] A third embodiment according to the present invention will then be described. The third mode has the same configuration as the second mode described above except that camera 1 illustrated in FIGURE 1 operates as will be described below.
[00153] The second mode described above was exemplified where the amount of motion of the IG image plane corresponding to the amount of clearance G is calculated using the current position image plane motion coefficient Kcur that corresponds to the lens position of the zoom lens 32 and lens position of focus lens 33 at the time of initiation of reverse trigger after finishing the scanning operation for focus lens 33 when calculating IG image plane motion amount corresponding to the amount of G clearance. In contrast, according to the third modality, the maximum image plane motion coefficient Kmax corresponding to the current lens position of the zoom lens 32 is used as a substitute for the current position image plane motion coefficient Kcur to calculate the IG image plane motion amount corresponding to the amount of slack G, and in this respect the third mode differs from the second modality described above.
[00154] An example of the operation according to the third embodiment will now be described with reference to the flowchart illustrated in FIGURE 11. As in the second embodiment described above, the operation below is performed if the focused position is detected using the contrast detection system in the step S109 in the flowchart described above illustrated in FIGURE 7.
[00155] More specifically, if the focused position is detected using the contrast detection system, then the camera control unit 21 performs in step S301 the acquisition of the maximum image plane motion coefficient Kmax at the current lens position of 32 zoom. For example, if the lens position of the 32 zoom lens (focal length) is at "f5" in the table illustrated in FIGURE 6, then "K52" in the gray cell is acquired as the image plane motion coefficient maximum Kmax.
[00156] According to the present embodiment, the moment at which the camera control unit 21 acquires the maximum image plane motion coefficient Kmax can be a moment at which the reverse triggering of the focus lens 33 is performed after the focused position has been detected using the contrast detection system, but it may otherwise be a time when the shutter-release button provided on the operating unit 28 was pressed halfway (first switch SW1 on) or a moment at which the focus adjustment operation started due to half-pressing the shutter-release button. That is, for acquisition of the maximum image plane motion coefficient Kmax at the time the shutter-release button was pressed halfway or at the time the focus adjustment operation was started due to pressing the shutter button halfway. shutter release, the camera control unit 21 can at such time send a signal requesting transmission of the maximum image plane motion coefficient Kmax through the camera transceiver unit 29 and the lens transceiver unit 38, thereby to acquire the same. In that case, the lens control unit 36 can be configured to receive from the camera control unit 21 the signal requesting transmission of the maximum image plane motion coefficient Kmax; use this as the basis for referencing the table that is stored in lens memory 37 and represents the relationship between each lens position and the image plane motion coefficient K, to thereby acquire the plane motion coefficient maximum image Kmax; and transmitting the same to the camera control unit 21 via the lens transceiver unit 38 and the camera transceiver unit 29.
[00157] An alternative configuration may also be possible so that the camera control unit 21 acquires the maximum image plane motion coefficient Kmax also in the case where the lens position of the zoom lens 32 varies, since the trigger of the zoom lens 32 can cause the lens position of the zoom lens 32 to vary and therefore cause the maximum image plane motion coefficient Kmax to be different.
[00158] Then, in step S302, as in the above-described step S202 illustrated in FIGURE 10, the camera control unit 21 performs the acquisition of information regarding the amount of clearance G (see FIGURE 8) of the drive transmission mechanism to the focus lens 33.
[00159] Then, in step S303, the camera control unit 21 calculates an IG image plane motion amount corresponding to the amount of slack G based on the maximum image plane motion coefficient described above Kmax acquired in step S301 and information described above regarding the amount of clearance G of the drive transmission mechanism for the focus lens 33 acquired in step S302. The amount of IG image plane motion corresponding to the amount of backlash G is an amount of motion of the image plane when the focusing lens is triggered by exactly the same amount as the amount of backlash G, and can be calculated according to Expression (3) below in this modality.
[00160] (Amount of IG image plane motion corresponding to amount of clearance G) - (amount of clearance G) x (maximum image plane motion coefficient Kmax) ...(3)
[00161] Then, in step S304, as in step S204 described above illustrated in FIGURE 10, the camera control unit 21 performs a process of comparing the image plane motion amount described above IG corresponding to the calculated amount of clearance G in step S303 with a predetermined image plane motion amount IP, and the result of this comparison is used to make a determination of whether the IG image plane motion amount corresponding to the amount of slack G is not greater than the amount of predetermined image plane motion IP, that is, whether a condition of (amount of motion of IG image plane corresponding to amount of slack G) < (amount of motion of predetermined image plane IP) is satisfied or not. The IP predetermined image plane motion amount can be configured in the same way as the second mode described above.
[00162] In step S305, it was determined in the above-described step S304 that the IG image plane motion amount corresponding to the amount of slack G is not greater than the predetermined image plane motion amount IP, in which case, as in step S205 described above illustrated in FIGURE 10, it is determined that the lens position of the focus lens 33 after actuation may fall within the focal depth of the optical system even without the backlash reduction drive and that the backlash reduction drive it is not performed at the time of the focus trigger, and this determination is used as the basis for performing the focus trigger without the backlash reduction trigger.
[00163] In step S306, on the other hand, it was determined in the above-described step S304 that the image plane motion amount IG corresponding to the amount of slack G is greater than the predetermined image plane motion amount IP, case in which, like the above-described step S206 illustrated in FIGURE 10, it is determined that the lens position of the focus lens 33 after actuation cannot fall within the focal depth of the optical system if actuation for backlash reduction is not performed and that the backlash reduction drive must be performed at the time of the focus drive, and such determination is used as the basis for performing the focus drive together with the backlash reduction drive.
[00164] According to the third embodiment, advantageous effects can be obtained in addition to those described in the second embodiment described above.
[00165] That is, the third mode can efficiently prevent that, even when the clearance reduction drive is in fact necessary, the clearance reduction drive can nevertheless be determined as unnecessary depending on the lens position of the focus lens 33, since the maximum image plane motion coefficient Kmax, which is set for each lens position of the zoom lens 32, is used in the third mode to calculate the IG image plane motion amount corresponding to amount of backlash G from the drive transmission mechanism to the focus lens 33 so that it is possible to determine whether or not drive for backlash reduction at the time of focus is necessary regardless of the lens position of the focus lens 33. In particular, if a lens barrel is used having the characteristic that the image plane motion coefficient K varies significantly regardless of the same lens position of the zoom lens 32 when the lens position of the focus lens 33 varies, so even when the backlash reduction trigger is actually required, the possibility that the backlash reduction trigger is determined to be unnecessary is high, so in such a case the present modality is particularly efficient.
[00166] Thus, depending on the types of lens barrels, due to their structure, the ratio of the change in the image plane motion coefficient K to the change in the lens position of the focus lens 33 is considered different. In this regard, a modified mode can be configured so that, for example, when the lens barrel 3 is fixed to the camera body 2, a determination is made as to the rate of change in the motion coefficient of image plane K to the change in lens position of the focus lens 33 is not less than a predetermined limit, and if it is not less than the predetermined limit, then the maximum image plane motion coefficient Kmax is used as in the third mode, while if it is less than the predetermined threshold, then the current position image plane motion coefficient Kcur is used as in the second modality, thus making such selection properly. Fourth Mode
[00167] A fourth embodiment according to the present invention will then be described. The fourth mode has the same configuration as the second mode described above except that camera 1 illustrated in FIGURE 1 operates as will be described below.
[00168] The second mode described above has been exemplified where the amount of motion of IG image plane corresponding to the amount of clearance G is calculated using the current image plane motion coefficient Kcur that corresponds to the lens position of the zoom lens 32 and the lens position of the focus lens 33 at the time of initiation of reverse drive after completion of the scanning operation for the focus lens 33 when calculating the amount of motion of image plane IG corresponding to the amount of backlash G. In contrast , according to the fourth modality, as a substitute for the current position image plane motion coefficient Kcur, the image plane motion coefficient K that corresponds to the lens position of the focus lens 33 when located in the vicinity of the position Focus is acquired as a Kfou focus proximity image plane motion coefficient Kfou, which is used to calculate the amount of motion. that of IG image plane corresponding to the amount of slack G, thus, in this respect, the fourth mode differs from the second mode described above.
[00169] An example of the operation according to the fourth embodiment will now be described with reference to the flowchart illustrated in FIGURE 12. As the second mode described above, the operation below is performed if the focused position is detected using the contrast detection system in the step S109 in the flowchart described above illustrated in FIGURE 7.
[00170] More specifically, if the focused position is detected using the contrast detection system, then the camera control unit 21 performs in step S401 an image plane motion coefficient acquisition process K corresponding to the lens position of the focus lens 33 when located in the vicinity of the focused position as an image plane motion coefficient in the vicinity of focus Kfou. The image plane motion coefficient acquisition method in the vicinity of Kfou focus can be as follows, for example. That is, while performing the scanning operation for the focus lens 33, the camera control unit 21 sequentially stores the image plane motion coefficient K corresponding to the current lens position, which is acquired using the stationary communication between the camera control unit 21 and lens control unit 36, along with information regarding the lens position of the focus lens 33. When the focused position is then detected, the image plane motion coefficient K when the lens 33 was located in the vicinity of the focused position is read, which can be used as the Kfou proximity-focus image plane motion coefficient.
[00171] Then, in step S402, as in step S202 described above illustrated in FIGURE 10, the camera control unit 21 performs the acquisition of information regarding the amount of clearance G (see FIGURE 8) of the drive transmission mechanism to the focus lens 33.
[00172] Then, in step S403, the camera control unit 21 calculates an IG image plane motion amount corresponding to the amount of slack G based on the image plane motion coefficient in the vicinity of focus Kfou described above acquired in step S401 and in the information described above with reference to the amount of clearance G from the drive transmission mechanism for the focus lens 33 acquired in step S402. The amount of IG image plane movement corresponding to the amount of backlash G is an amount of movement of the image plane when the focusing lens is triggered by exactly the same amount as the amount of backlash G, and can be calculated accordingly. with the expression (4) below in the present modality.
[00173] (Amount of motion of IG image plane corresponding to amount of clearance G) = (amount of clearance G) x (coefficient of motion of image plane near focus Kfou) ...(4)
[00174] Then, in step S404, like the above-described step S204 illustrated in FIGURE 10, the camera control unit 21 performs a process of comparing the image plane motion amount described above IG corresponding to the calculated amount of backlash G in step S403 with a predetermined image plane motion amount IP, and the result of this comparison is used to make a determination of whether the IG image plane motion amount corresponding to the amount of slack G is not greater than the amount of predetermined image plane motion IP, that is, whether a condition (amount of motion of IG image plane corresponding to amount of slack G) < (amount of motion of predetermined image plane IP) is satisfied or not. The IP predetermined image plane motion amount can be configured in the same way as the second mode described above.
[00175] In step S405, it was determined in the above-described step S404 that the IG image plane motion amount corresponding to the amount of slack G is not greater than the predetermined image plane motion amount IP, in which case, as in step S205 described above illustrated in FIGURE 10, it is determined that the lens position of the focus lens 33 after actuation may fall within the focal depth of the optical system even without the backlash reduction actuation and that actuation The backlash reduction should not be performed at the time of the focus trigger, and this determination is used as the basis for performing the focus trigger without the backlash reduction trigger.
[00176] In step S406, on the other hand, it was determined in the above-described step S404 that the image plane motion amount IG corresponding to the amount of slack G is greater than the predetermined image plane motion amount IP, case in which, as in the above-described step S206 illustrated in FIGURE 10, it is determined that the lens position of the focus lens 33 after actuation does not fall within the focal depth of the optical system if the backlash reduction actuation is not performed and that the backlash reduction drive must be performed at the time of the focus drive, and this determination is used on the basis of performing the focus drive together with the backlash reduction drive.
[00177] According to the fourth embodiment, advantageous effects can be obtained in addition to those of the second embodiment described above.
[00178] That is, according to the fourth modality, when calculating the IG image plane motion amount corresponding to the amount of clearance G of the drive transmission mechanism for the focus lens 33, image plane motion coefficient proximity of focus Kfou is used being the image plane motion coefficient corresponding to the lens position of the focus lens 33 when located in the vicinity of the focused position, in which case the calculated image plane motion amount IG corresponding to amount of backlash G can be based on the coefficient of motion of the image plane when the focus lens 33 was actually driven to the focused position. Accordingly, the fourth mode can calculate the amount of IG image plane motion corresponding to the amount of backlash G more accurately, and it is thus possible to properly make a determination of whether the backlash reduction drive is necessary or do not. Fifth Mode
[00179] A fifth embodiment according to the present invention will then be described. In the fifth modality, the description of a configuration similar to the first modality described above will be omitted.
[00180] The operation according to the fifth mode described below can be performed in combination with any one according to the first to fourth modes described above, or just performed separately from those according to the first to fourth modes.
[00181] Single lens reflex digital camera 1a according to the fifth modality, as illustrated in FIGURE 13, comprises a camera body 2a, a mirror system 240, a phase difference AF module 210 and an optical system of finder, and in that respect it has a different configuration from camera 1 described above.
[00182] The mirror system 240 comprises a fast-return mirror 241 that pivotally moves around a hinged geometric axis 243 within a predetermined angular range between an observation position and an imaging position for an object; and a submirror 242 which is pivotally supported on the fast return mirror 241 and pivotally moves in sync with the pivotal movement of the fast return mirror 241. In FIGURE 13, a state in which the mirror system 240 is located in observation position for an object is indicated by solid lines, while a state in which the mirror system 240 is located at the imaging position for an object is indicated by two-point streamlines.
[00183] The fast return mirror 241 is configured as a half mirror and, in a state of being in the observation position for an object, reflects part of the light beams (optical geometric axes L3 and L4) from those of an object (axis optical geometry L1) to orient them to the finder 235 and the photometric sensor 137 while transmitting the remaining light beams (optical geometry axis L5) to orient them to the submirror 242. In contrast, the submirror 242 is configured to from a full reflex mirror and orients the light beams (optical geometry axis L4) transmitted through the fast return mirror 241 to the phase difference AF module 210.
[00184] The light beams from an object reflected by the fast-return mirror 241 form an image of a focus screen 231 arranged in a plane optically equivalent to an imaging device 22a, being thus observable through a pentaprism 233 and an ocular lens 234. At this time, a transmissive-type liquid crystal display device 232 superimposes indications such as a focus detection area mark to the image of an object projected onto the focal plane plate 131 for display.
[00185] The operating unit 28 has a live view imaging ON/OFF switch (not shown). When live view creation is OFF and the mirror system 240 is in a state of being in an observation position for an object, the phase difference AF can be realized using the phase difference AF module 210. Additionally, if live view imaging is ON, then mirror system 240 enters the imaging position for an object and a state is obtained in which light beams from an object are directed to the imaging device. 22a image (such as a state in which a knockout image is displayed), so that contrast AF can be performed. In this case, an operation similar to the first to fourth modalities above can be performed. Examples of operation in accordance with the fifth embodiment will then be described in detail with reference to FIGURES 14, 15 and 16.
[00186] The operation illustrated in FIGURE 14 is initiated by the power of camera 1a being turned on. First, in step S501, camera body 2a performs communication for identifying a lens drum 3. This is because the available communication format is different depending on the types of lens drums.
[00187] Then, in step S502, a determination is made as to whether or not the live view imaging ON/OFF switch provided in the operating unit 28 has been operated by the photographer, and whether the live view imaging ON/OFF switch provided in the operating unit 28 has been operated by the photographer, and whether live view is ON, then the mirror system 240 enters the imaging position for an object so that light beams from an object are directed to the imaging device 22a.
[00188] In step S503, stationary communication is initiated between camera body 2a and lens drum 3. In stationary communication, lens control unit 36, when receiving the first request signal from camera control unit 21, repeatedly transmits lens information such as current position image plane motion coefficient Kcur to camera control unit 21. Stationary communication is repeatedly performed in step S503 and in subsequent steps. It is preferred that stationary communication be carried out repeatedly until the power switch is turned off, for example.
[00189] In step S504, a determination is made as to whether or not a given operation has been performed by the photographer, such as a half-press operation of the release button provided on the operating unit 28 (first switch SW1 turned on ) or an AF initiation operation, and if such an operation is performed, then the routine proceeds to step S505 (a case of half-press operation being performed will be described in detail later).
[00190] In step S505, the camera control unit 21 is triggered by half-pressing operation (first switch SW1 turned on) by the photographer to transmit the second request signal to the lens control unit 36. The transmission conditions of the second request signal to the lens control unit 36 may include a case in which the photographer performs the AF initiation operation, a case in which half-pressing the shutter-release button initiates the focus adjustment operation , a case in which the photographer performs a zoom lens 32 actuation operation, and a case in which the power of camera 1a is turned on.
[00191] In step S506, after receiving the second request signal, the lens control unit 36 refers to the table (see FIGURE 6), which is stored in lens memory 37 and represents the relationship between each lens position and the image plane motion coefficient K, to acquire a maximum image plane motion coefficient Kmax and a minimum image plane motion coefficient Kmin that corresponds to the current lens position of the zoom lens 32, and transmit the maximum image plane motion coefficient Kmax and minimum image plane motion coefficient Kmin for camera control unit 21.
[00192] In step S507, the camera control unit 21 transmits a scan trigger command (instructions for starting the scan trigger) to the lens control unit 36 to perform focus detection using the system of contrast detection. Scan drive command for lens control unit 36 (drive speed instructions for scan drive or drive position instructions) can be provided as drive speed for focus lens 33, the movement speed of the image plane, or the target trigger position, etc. Then, in step S508, the lens control unit 36 performs trigger control for the focus lens 33 based on the scan trigger command.
[00193] Then, in step S509, the camera control unit 21 performs an anomaly determination process as will be described later. In step S510, the camera control unit 21 determines whether or not a peak value of the focus evaluation value can be detected (whether a focused position can be detected or not). If a peak value of the focus evaluation value cannot be detected, the routine returns to step S508, whereas if a peak value of the focus evaluation value could be detected, the routine proceeds to step S511 .
[00194] In step S511, the camera control unit 21 transmits to the lens control unit 36 a command to perform the focus drive to the position corresponding to the peak value of the focus evaluation value. Lens control unit 36 performs trigger control for focus lens 33 in response to the received command.
[00195] In step S512, the camera control unit 21 makes a determination that the focus lens 33 has reached the position corresponding to the epic value of the focus evaluation value, and performs the image creation control. for a still image if the all-press operation (second switch SW2 on) has been performed by the photographer. After completion of imaging control, the routine returns again to step S503.
[00196] The anomaly determination process (see step S509 in FIGURE 14) will then be described in detail with reference to FIGURES 15 and 16.
[00197] The description now refers to FIGURE 15. In step S601, a determination is made as to whether or not the current position image plane motion coefficient Kcur acquired repeatedly through stationary communication is greater than the coefficient of maximum image plane motion described above Kmax acquired in step S506. That is, it is determined whether or not a current position image plane motion coefficient Kcur satisfying a condition of (maximum image plane motion coefficient Kmax) < (current position image plane motion coefficient Kcur) has been detected ). If a current position image plane motion coefficient Kcur satisfying the condition of (maximum image plane motion coefficient Kmax) <(current position image plane motion coefficient Kcur) is detected, then some anomaly is considered as having occurred, such as the communication anomaly between the camera body 2 and the lens barrel 3, and the routine proceeds to step S605 in which an anomaly indicator is set to "1" to exit the process of determining anomaly, followed by step S510 illustrated in FIGURE 14. Note that the anomaly indicator is set to "0" in a normal condition such as when no anomaly occurs. If, on the other hand, a current position image plane motion coefficient Kcur satisfying the condition of (maximum image plane motion coefficient Kmax) < (current position plane motion coefficient Kcur) is not detected , then the routine proceeds to step S602.
[00198] In step S602, a determination is made as to whether or not the focus lens 33 was triggered from the near end to the infinite end while from the moment camera 1 power was turned on to the current moment. If the focus lens 33 has been driven from the near end to the infinite end, then the routine proceeds to step S606 where a determination is made as to whether or not as a result of the focus lens 33 being driven to from near end to infinite end, a current position image plane motion coefficient Kcur satisfying a condition of (current position image plane motion coefficient Kcur) = (maximum image plane motion coefficient Kmax) was able to be detected among those obtained through stationary communication. If, despite the focus lens 33 triggered from the near end to the infinite end, a current position image plane motion coefficient Kcur satisfying the condition of (current position image plane motion coefficient Kcur) = (maximum image plane motion coefficient Kmax) cannot be detected, so some anomaly is considered to have occurred, such as the communication anomaly between camera body 2 and lens barrel 3, and the routine proceeds to step S607 where the anomaly indicator is set to "2" to exit the anomaly determination process, followed by step S 510 illustrated in FIGURE 14. If, in step S606, a current position image plane motion coefficient Kcur satisfying the condition that (current position image plane motion coefficient Kcur) = (maximum image plane motion coefficient Kmax) can be detected, then the routine exits the process of determining anomaly and proceeds to step S510 illustrated in FIGURE 14.
[00199] If, in step S602, the focus lens 33 is determined not to be triggered from the near end to the infinite end, then the routine proceeds to step S603.
[00200] Then, in step S603, the camera control unit 21 determines whether the trigger operation for the zoom lens 32 has been performed or not. If the drive operation for the zoom lens 32 has been determined to be performed, the routine proceeds to step S604, whereas if the drive operation for the zoom lens 32 is determined not to have been performed, the routine exits the anomaly determination process and proceeds to step S510 shown in FIGURE 14.
[00201] At step S604, the camera control unit 21 transmits the second request signal again to the lens control unit 36, which then returns to the camera control unit 21 a maximum image plane motion coefficient. Kmax which corresponds to the lens position of the 32 zoom lens after it has been triggered. Additionally, the camera control unit 21 resets the maximum image plane motion coefficient Kmax and current position image plane motion coefficient Kcur that were obtained before the zoom lens 32 was triggered.
[00202] This is because the determinations described above in steps S601 and S606 must compare the maximum image plane motion coefficient Kmax and the current image plane motion coefficient Kcur that were obtained when the zoom lens 32 was in the same position of lens, so that if the lens position of the zoom lens 32 varies, then the determinations described above in steps S601 and S606 cannot be properly performed unless the maximum image plane motion coefficient Kmax and the coefficient of current position image plane motion Kcur are collected again. After completion of the process in step S604, the routine returns to step S601.
[00203] Referring to FIGURE 16, a case in which the anomaly indicator is set to "1" will then be described in detail. The description with reference to FIGURE 16 will be directed to an example of the case in which the zoom lens position (focal length) is at "f1" (see FIGURE 6).
[00204] FIGURE 16 exemplifies a case in which the half-press operation of the shutter-release button was performed at time t2 by the photographer, in which case it is assumed that the lens control unit 36 transmits at time t4 to the camera control unit 21 the maximum image plane motion coefficient Kmax of "K12" instead of "K11". The camera control unit 21 then sends at time t7 the scan trigger command to lens control unit 36. At time t1, t3, t5, t6 before the scan trigger command, the plane motion coefficient maximum image rate Kmax is "K19" since focus lens 33 is not moved.
[00205] After time t8 at which the scan trigger command was sent, the current position image plane motion coefficient Kcur is "K18" at time t9, then "K12" at time t10, then "K11" at the moment t12.
[00206] In this case, the example illustrated in FIGURE 16 is such that the camera control unit 21 receives at time t4 the maximum image plane motion coefficient Kmax of "K12". Therefore, at time t12, the current position image plane motion coefficient Kcur of "K11" greater than "K12" is received, which satisfies the condition of (maximum image plane motion coefficient Kmax)<( current position image plane motion coefficient Kcur) (see step S601 illustrated in FIGURE 15), so that the anomaly indicator is set to "1" (see step S605 illustrated in FIGURE 15).
[00207] In the modality described above, if the anomaly indicator is set to "1" step S605 (if a current position image plane motion coefficient Kcur satisfying the condition of (maximum image plane motion coefficient Kmax ) < (current position image plane motion coefficient Kcur) is detected), or if the anomaly indicator is set to "2" in step S606 (if despite the focus lens 33 triggered from the near end for the infinite end, a current position image plane motion coefficient Kcur satisfying the condition of (current position image plane motion coefficient Kcur)=(maximum image plane motion coefficient Kmax) was not able to detected), then some anomaly is considered to have occurred, such as a communication anomaly between camera body 2 and lens barrel 3.
[00208] If the malfunction indicator is set to "1" or "2", it is preferable to carry out a malfunction process. The anomaly process may preferably include prohibiting the display of the focused state such as using electronic viewfinder 26, for example. If the anomaly indicator is set to "1" or "2", then anomalies such as communication anomaly, circuit anomaly and power anomaly can occur, so reliability in AF cannot be guaranteed. For this reason, it is preferable to carry out the anomaly process, such as prohibiting focused state display, for the purpose of avoiding "focused state display" with low reliability. Note that if in step S509 the anomaly indicator is set to "1" or "2" and the focused state display is inhibited, then the focused state display is not performed even when the focus lens 33 reaches the focused position in step S511.
[00209] If the anomaly indicator is set to "1" or "2", then, alternatively or in addition to performing the focused state display prohibition process, it is preferable also to perform all range search that triggers the lens of focus 33 from near end to infinity end, for example. By performing the entire lane search, the causes of the anomaly can be confirmed as having disappeared.
[00210] It is additionally preferable to perform the entire range search so that the focus lens 33 is driven from the near end to the infinite end using a second drive speed that is sufficiently lower than a first drive speed such as speed normal triggering. This is because a sufficiently low second drive speed allows the entire range search to be carried out safely. This is also because, if the drive speed for the focus lens 33 is too high to detect a current position image plane motion coefficient Kcur satisfying the condition of (current position image plane motion coefficient Kcur )=(maximum picture plane motion coefficient Kmax), then any range search using a sufficiently low second drive speed can allow detection of such current position picture plane motion coefficient Kcur.
[00211] If the anomaly indicator is set to "1" or "2", then alternatively or in addition to the process of prohibiting the display of the focused state and/or process of performing the entire range search using a second speed low enough, an additional process can be performed such as to prohibit both focus detection using the phase difference detection system and focus detection using the contrast detection system. In particular, if the anomaly indicator is set to "1" or "2" such that some anomaly such as a communication anomaly is considered to have occurred, then the possibility of a successful focus detection result cannot be obtained is high even when focus detection using the phase difference detection system and focus detection using the contrast detection system are performed, and thus in such case the focus detection using the detection system of phase difference and focus detection using contrast detection system may be prohibited.
[00212] In the fifth mode, if the anomaly indicator is once set to "1" or "2", then some anomaly such as the communication anomaly is considered to have occurred, and it is therefore preferable that the indicator The anomaly indicator remains set to "1" or "2" without being reset until the power is turned off or lens barrel 3 is replaced.
[00213] In the fifth mode, reliability in AF cannot be guaranteed if, for example, the anomaly indicator is set to "1" or "2" in step S509 illustrated in FIGURE 14, and thus to avoid the Senseless triggering of the focus lens 33, a process can be performed to prohibit the triggering of the focus lens 33 regardless of whether or not the camera control unit 21 was able to detect the peak value in step S510. In that case, it is preferable that the focus lens 33 is prevented from being actuated until the power has been turned off or the lens barrel 3 is replaced.
[00214] If the anomaly indicator is set to "1" or "2" in step S509 illustrated in FIGURE 14, for example, then the camera control unit 21 can perform one or more additional processes, such as a process of performing full range search using a second drive speed sufficiently low regardless of whether or not the peak value was able to be detected in step S510, a process of prohibiting at least one of the focus detection using the system phase difference detection and focus detection using the contrast detection system, a camera power off process, and an alert display process indicating an anomaly has occurred.
[00215] Reliability in AF cannot be guaranteed if, for example, the anomaly indicator is set to "1" or "2" in step S509 illustrated in FIGURE 14, and an additional process may therefore be possible so that the camera control unit 21 does not perform focus trigger in step S511 even when peak value was detected in step S510. Sixth Modality
[00216] A sixth embodiment according to the present invention will then be described. In the sixth mode, the description of a configuration similar to the fifth mode described above will be omitted.
[00217] The operation according to the sixth mode described below can be performed in combination with any of the first to fifth modes described above, or it only performs separately from those according to the first to fifth modes.
[00218] In the sixth embodiment illustrated in FIGURE 18, steps S501 to S504, S507, S508 and S510 to S512 are similar to those of FIGURE 4, so that a detailed explanation will be omitted. In step S504, a determination is made as to whether or not a given operation has been performed, such as a half-press operation of the release button (first switch SW1 turned on) or an AF start operation, and if such an operation has been performed, then the routine proceeds to step S507 where the camera control unit 21 transmits a scan trigger command to the lens control unit 36, followed by step S508 in which the control unit lens 36 performs trigger control for focus lens 33 based on the scan trigger command.
[00219] Then, in step S705, the camera control unit 21 is driven by the scan trigger command (see step S507) to the lens control unit 36 to periodically transmit the second request signal to the control unit of lens 36. The condition for transmitting the second request signal to the lens control unit 36 may be based, for example, on a trigger at a time when the camera control unit 21 detects that the camera control unit lens 36 actually initiates drive control for focus lens 33, or a trigger at a time when a given signal is transmitted from lens control unit 36 to camera control unit 21 upon command of scanning trigger, etc. The second request signal can be transmitted simultaneously with the scan trigger command to the lens control unit 36.
[00220] It is preferable in the present embodiment for the camera control unit 21 to periodically transmit the second request signal until a transmission interruption condition of the second request signal is satisfied as will be described later. The period in which the second request signal is transmitted may preferably be shorter than the period in which the first request signal is transmitted. For example, it may be preferable to be half or less than the period in which the first request signal is transmitted.
[00221] Then, in step S706, while periodically receiving the second request signal, the lens control unit 36 refers to the table (see FIGURE 6) which is stored in the memory of the lens 37 and represents the relationship between each lens position and the image plane motion coefficient K, to acquire a maximum image plane motion coefficient Kmax and a minimum image plane motion coefficient Kmin that corresponds to the current lens position of the zoom lens 32, and periodically transmit the maximum image plane motion coefficient Kmax and the minimum image plane motion coefficient Kmin for the camera control unit 21.
[00222] Then, in step S709, the camera control unit 21 performs an anomaly determination process as will be described later. For example, the camera control unit 21 may periodically perform anomaly determination, while periodically transmitting the second request signal, using a trigger at a time when transmitting the second request signal or at a time when the receiving the maximum image plane motion coefficient Kmax and the minimum image plane motion coefficient Kmin. Transmission of the second request signal in a short period allows the anomaly determination to be carried out in the short period, and a successful abnormal determination can thus be achieved.
[00223] Then, in step S510, the camera control unit 21 determines whether or not a peak value of the focus evaluation value can be detected (whether a focused position can be detected or not). If a peak value of the focus evaluation value cannot be detected, the routine returns to step S508. If a peak value of the focus evaluation value can be detected, then the routine proceeds to step S511 where the camera control unit 21 stops periodic transmission of the second request signal. The condition for stopping transmission of the second request signal can be based, for example, on triggering at a time when a command for focus triggering is transmitted to the lens control unit 36, when the lens shifts. focus 33 reaches a position that corresponds to the peak value of the focus evaluation value, when the camera control unit 21 determines that a peak position cannot be detected, when the camera control unit 21 determines the end of the operation. when the camera control unit 21 determines the termination of contrast AF control, or when the camera control unit 21 determines the termination of the live view display, etc. It is preferable that the first request signal is periodically transmitted from before a time at which periodic transmission of the second request signal starts to after a time at which periodic transmission of the second request signal ends. In other words, the period of time during which the second request signal is periodically transmitted is included in the period of time during which the first request signal is periodically transmitted.
[00224] The anomaly determination process (see step S709 in FIGURE 18) will then be described in detail with reference to FIGURE 19. In FIGURE 19, steps S602-S605 and S607 are similar to those of FIGURE 15, so that the detailed explanation is omitted.
[00225] In step S801, illustrated in FIGURE 19, a determination is made as to whether or not the current position image plane motion coefficient Kcur acquired repeatedly through stationary communication is greater than the motion coefficient of maximum image plane described above Kmax acquired in step S706 or less than the minimum image plane motion coefficient Kmin. If a current position image plane motion coefficient Kcur satisfying the condition of (maximum image plane motion coefficient Kmax) < (current position action plane motion coefficient Kcur) or (motion coefficient of minimum image plane Kmin) > (current position image plane motion coefficient Kcur) is detected, so some anomaly is considered to have occurred, such as the communication anomaly between camera body 2 and lens barrel 3 , and the routine proceeds to step S605 where the anomaly indicator is set to "1" to exit the anomaly determination process, followed by step S510 illustrated in FIGURE 18. If, on the other hand, a plane motion coefficient of current position image Kcur satisfying the condition of (maximum image plane motion coefficient Kmax) < (current position image plane motion coefficient Kcur) or (minimum image plane motion coefficient Kmin) > (current position image plane motion coefficient Kcur) is not detected, so the routine proceeds to step S602.
[00226] If, in step S602, it is determined that the focus lens 33 was triggered from the near end to the infinite end, then the routine proceeds to step S806. In step S806, a determination is made as to whether or not, as a result of firing the focus lens 33 from the near end to the infinite end, a current position image plane motion coefficient Kcur satisfying a condition of (current position image plane motion coefficient Kcur) = (maximum image plane motion coefficient Kmax) and (current position image plane motion coefficient Kcur) = (image plane motion coefficient minimum Km) can be detected among those obtained through stationary communication. If, despite the focus lens 33 triggered from the near end to the infinite end, a current position image plane motion coefficient Kcur satisfying the condition of (current position image plane motion coefficient Kcur) = (maximum image plane motion coefficient Kmax) and (current position image plane motion coefficient Kcur) = (minimum image plane motion coefficient Kmin) cannot be detected, so some anomaly is considered to have occurred , such as the communication anomaly between the camera body 2 and the lens barrel 3 and the routine proceeds to step S607 where the anomaly indicator is set to "2" to exit the anomaly determination process, followed by step S510 illustrated in FIGURE 18. If, in step S806, a current position image plane motion coefficient Kcur satisfying the condition of (current position image plane motion coefficient Kcur) = ( maximum image plane motion coefficient Kmax) and (current position image plane motion coefficient Kcur) = (minimum image plane motion coefficient Kmin) can be detected, so the routine exits the anomaly determination process and proceeds to step S510 illustrated in FIGURE 18.
[00227] It should be appreciated that the embodiments explained so far are described to facilitate understanding of the present invention and are not described to limit the present invention. Therefore, it is intended that the elements described in the above embodiments include all design changes and their equivalents to be within the technical scope of the present invention. Additionally, two or more modalities described above may be suitably combined for use.
[00228] For example, the modalities described above employ the value calculated by (amount of image plane motion)/(amount of focus lens drive 33) as the image plane motion coefficient K, but image plane motion coefficient K can be a value calculated by (amount of focus lens trigger 33)/(amount of image plane motion).
[00229] For example, if the value calculated by (amount of image plane motion)/(amount of focus lens drive 33) is employed as the image plane motion coefficient K, then as the value (absolute value) increases, the amount of movement of the image plane when the focus lens is triggered by a certain value (eg 1mm), increases. If the value calculated by (focus lens trigger amount 33)/(image plane motion amount) is employed as the image plane motion coefficient K, then as the value (absolute value) increases , the amount of movement of the image plane when the focus lens is triggered by a certain amount (eg 1 mm), decreases.
[00230] According to the modalities described above, if, in step S601 illustrated in FIGURE 15, a current position image plane motion coefficient Kcur satisfying the condition of (maximum image plane motion coefficient Kmax)<( current position image plane motion coefficient Kcur) is detected, then some anomaly must have occurred, such as communication anomaly between camera body 2 and lens barrel 3, and the anomaly indicator is set accordingly , to "1" (step S605), while on the other hand, if a current position image plane motion coefficient Kcur satisfying the condition of (maximum image plane motion coefficient Kmax)<(plane motion coefficient current position image display Kcur) is not detected, then the anomaly indicator is set to "0" (the routine proceeds to step S602), but the present invention is not limited to the above.
[00231] For example, the above procedure can be modified so that, if, in step S601 illustrated in FIGURE 15, a current position image plane motion coefficient Kcur satisfying the condition of (image plane motion coefficient minimum Kmin)>(current position image plane motion coefficient Kcur) is detected, then some anomaly is considered to occur, such as the communication anomaly between the camera body 2 and the lens barrel 3, and the indicator of anomaly is set accordingly to "1" (step S605), while on the other hand, if a position image plane motion coefficient Kcur satisfying the condition of (minimum image plane motion coefficient Kmin)>(coefficient current position image plane motion (Kcur) is not detected, then the anomaly indicator is set to "0" (routine proceeds to step S602).
[00232] According to the modalities described above, despite the focus lens 33 driven from the rear end to the infinite end, if, in step S606 illustrated in FIGURE 15, a current position image plane motion coefficient Kcur satisfying the condition of (current position image plane motion coefficient Kcur)=(maximum image plane motion coefficient Kmax) cannot be detected, so some anomaly is considered to have occurred, such as the communication anomaly between camera body 2 and lens barrel 3, and the anomaly indicator is accordingly set to "2" (step S607), while on the other hand, if a current position image plane motion coefficient Kcur satisfying the condition of (current position image plane motion coefficient Kcur) = (maximum image plane motion coefficient Kmax) can be detected, so the anomaly indicator is set to "0" (routine exits from anomaly determination process), but the present invention is not limited to the above.
[00233] For example, the above procedure can be modified so that, despite the focus lens 33 driven from the near end to the infinite end, if, in step S606 illustrated in FIGURE 15, a plane motion coefficient of current position image Kcur satisfying the condition that (current position image plane motion coefficient Kcur) = (minimum image plane motion coefficient Kmin) cannot be detected, then some anomaly such as communication anomaly between camera body 2 and lens barrel 3, and the anomaly indicator is set accordingly to "2" (step S607), while on the other hand, if a position image plane motion coefficient current Kcur satisfying the condition that (image plane motion coefficient of current position Kcur) = (minimum image plane motion coefficient Kmin) can be detected, so the anomaly indicator is set to "0" ( the routine exits the anomaly determination process).
[00234] According to the modalities described above, anomalies such as communication anomaly can be detected by a simple process, using at least one of the minimum image plane motion coefficient Kmin and the minimum image plane motion coefficient of maximum Kmax image, to thereby result in a considerably advantageous effect that a focus adjustment control apparatus can be provided with high reliability.
[00235] The modalities described above are configured so that the lens memory 37 stores the table that is illustrated in FIGURE 6, and represents the relationship between each lens position and the image plane motion coefficient K, but one configuration modified can also if possible so that lens control unit 36 instead of lens memory 37 stores the table. The modalities described above are configured to store the table which is illustrated in FIGURE 6 and represents the relationship between the lens position of the zoom lens 32 and the lens position of the focus lens 33, and the image plane motion coefficient K, but can be modified to use a table that represents the relationship between the lens position on the 32 zoom lens only and the K image plane motion coefficient, or a table that represents the relationship between the lens position of just the focus lens 33 and the image plane motion coefficient K. In particular, depending on the type, some 3 lens drums are such that, if the lens position of the zoom lens 32 is equal, the variation in the motion coefficient The K image plane is very small even when the lens position of the focus lens 33 varies, in which case it can be useful to use a table that represents the relationship between the lens position of the zoom lens 32 alone and the coefficient. of movement of image plane K. If the lens barrel 3 consists essentially of a single focus lens, it may be useful to use a table that represents the relationship between the lens position of the focus lens 33 alone and the plane motion coefficient of image K.
[00236] The modalities described above are configured to store the table representing the relationship between the lens position of the zoom lens 32 and the lens position of the focus lens 33 and the image plane motion coefficient K, but it can further understand a table that stores additional data with consideration for ambient temperature and camera attitude 1.
[00237] The modalities described above are configured so that the lens control unit 36 transmits the maximum image plane motion coefficient Kmax and the minimum plane motion coefficient Kmin in response to the request signal from the image control unit. camera 21, but the present invention is not limited to such a configuration. An alternative mode can be configured, for example, so that the lens control unit 36 transmits the maximum image plane motion coefficient Kmax and the minimum image plane motion coefficient Kmin such as when receiving the unit of camera control 21 of a signal for activating the zoom lens 32, when receiving from the camera control unit 21 of a signal notifying that the shutter-release button has been pressed halfway, or when receiving from from the camera control unit 21 of a signal notifying that the focus adjustment operation has been initiated due to half-pressing of the shutter-release button, rather than in response to the request signal from the camera control unit 21. In a further embodiment, the lens control unit 36 can be configured to transmit one of the maximum image plane motion coefficient Kmax or the motion coefficient. minimum image plane nt Kmin which represents a minimum value between the configured K image plane motion coefficients for the respective lens positions of the zoom lens 32, in which case the lens control unit 36 can perform the transmission in response to the transmission request of the maximum image plane motion coefficient Kmax or the minimum image plane motion coefficient Kmin of the camera control unit 21, or the lens control unit 36 can also perform the transmission so that when receiving a signal to trigger the zoom lens 32 even without the transmission request as above.
[00238] In the second to fourth modalities described above, a drive scheme for backlash reduction has been described so that when performing the focus drive of the focus lens 33, the focus lens 33 is passed once through the focused position and then inverted to the focused position, but another backlash reduction drive scheme can also be employed in which, when performing the focus drive, an amount of backlash is added to the amount of drive required to drive the lens of 33 focus to focused position. In that case, if the backlash reduction drive is not performed, the focus lens 33 can be driven to the focused position without adding an amount of backlash.
[00239] The camera 1 according to the modalities described above is not particularly limited, and the present invention can, for example, be applied to a digital video camera, a built-in lens-type digital camera, a camera for mobile phones, a scope, a field scope, or other optical devices.
[00240] The present invention is not limited to devices capable of storing the image plane motion coefficient K in the memory of the lens 37 as long as the maximum image plane motion coefficient Kmax can be transmitted. For example, the maximum image plane motion coefficient Kmax can be calculated just using the position of the zoom lens, and the calculated maximum image plane motion coefficient Kmax can be transmitted to the camera body 2. In a way Similarly, the minimum image plane motion coefficient Kmin can be calculated such as using the zoom lens position, and the calculated minimum image plane motion coefficient Kmin can be transmitted to camera body 2.
[00241] It is also preferable that if the maximum image plane motion coefficient Kmax or the minimum image plane motion coefficient Kmin varies even though the position of the zoom lens does not vary, for example, then it is determined that a anomaly has occurred, and a suitable process can be performed as in the case where the anomaly indicator is set to "1" or "2" as illustrated in FIGURE 15.
[00242] The maximum image plane motion coefficient Kmax stored in the memory of lens 37 can also be illustrated in FIGURE 17. The minimum image plane motion coefficient Kmin can also be set in a similar way to the motion coefficient of Kmax maximum image plane, but detailed illustration is omitted.
[00243] The maximum image plane motion coefficient Kmax and the minimum image plane motion coefficient Kmin stored in lens memory 37 can each be an integer, a value including a fraction after the decimal point, a index number, or a logarithmic number. The maximum image plane motion coefficient Kmax and the minimum image plane motion coefficient Kmin can each be a decimal number or a binary number, etc.
[00244] The present invention is not limited to devices in which the electrical contacts of the mounting unit 401 of the camera body 2 and the electrical contacts of the mounting unit 402 of the lens barrel 3 are connected to each other, as long as the coefficient maximum image plane motion coefficient Kmax can be transmitted to camera body 2. For example, maximum image plane motion coefficient Kmax can be transmitted using a wireless communication line from lens drum 3 to the camera body 2. 1 Digital camera 2 Camera body 21 Camera control unit 22 Imaging device 221 Imaging pixels 222a, 222b. Focus detection pixels 3 Lens barrel 32 Zoom lens 33 Focus lens 36 Lens control unit 37 Lens memory

权利要求:
Claims (9)
[0001]
1. Lens drum, characterized in that it comprises: an optical system (33) including a focus-adjusting lens; a drive unit (331) that drives the focus adjustment lens in the direction of an optical axis; a detection unit (332) that detects a position of the focus adjustment lens; a transceiver unit (38) that performs transmission and reception of a signal between the lens barrel and the camera body; and a control unit (36) which controls the transceiver unit so that the transceiver unit transmits to the camera body a first coefficient of motion of the image plane determined depending on the position of the focus adjustment lens, the first coefficient of image plane motion being a coefficient of motion of the image plane that varies depending on the position of the focus adjustment lens, the first coefficient of motion of the image plane corresponding to an amount of motion of an image plane with respect to a amount of movement of the focus adjustment lens at which the control unit, upon receiving a predetermined signal from a camera body through the transceiver unit, transmits to the camera body through the transceiver unit a second image plane motion coefficient that minimizes the amount of the image plane in relation to the amount of movement of the focus adjustment lens within an actionable range of the adjustment lens. This focus is activated by the drive unit and repeatedly transmits the first image plane motion coefficient and the second image plane motion coefficient to the camera body.
[0002]
2. Lens drum according to claim 1, characterized in that the control unit repeatedly transmits to the camera body through the transceiver unit a third image plane motion coefficient that maximizes the amount of the image plane image in relation to the amount of movement of the focus adjustment lens within the actionable range of the focus adjustment lens driven by the drive unit.
[0003]
3. Lens drum according to any one of claims 1 to 2, characterized in that it further comprises a zoom lens drive unit (321) which drives a zoom lens (32) in the axis direction optical, in which when the focal length of the zoom lens does not vary, the coefficient of motion of the image background does not vary, even if the lens position of the focus adjustment lens varies, but when the focal length of the zoom lens varies, the coefficient of motion of the image background varies.
[0004]
4. Lens drum according to any one of claims 1 to 3, characterized in that the first image plane motion coefficient and the second image plane motion coefficient are information for determining the reliability of the detection of a focused position of the optical system.
[0005]
5. Lens drum according to claim 4, characterized in that the focused position is a position of the focus adjustment lens lens at which a focus evaluation value of the optical system becomes maximum.
[0006]
6. Lens drum according to any one of claims 1 to 5, characterized in that it further comprises an optical zoom system that varies a focus distance of the lens drum, wherein the second coefficient of motion of the Image plane varies when the lens position of the optical zoom system.
[0007]
7. Lens drum according to any one of claims 1 to 6, characterized by the fact that the motion coefficient of the image plane corresponds to TI / TL, which is a ratio of the amount of movement TI of the image plane. image in relation to the amount of movement TL of the focus adjustment lens.
[0008]
8. Lens drum according to any one of claims 1 to 7, characterized in that it further comprises a memory that stores the second motion coefficient of the image plane.
[0009]
9. Camera body, in which a lens barrel as defined in any one of claims 1 to 8, characterized in that it comprises: an acquisition unit (29) which obtains the first motion coefficient of the image plane and the second coefficient of movement of the image plane from the lens barrel; and a control unit (21) that performs the abnormality determination based on the first image plane motion coefficient and the second image plane motion coefficient.

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法律状态:
2018-12-04| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2020-04-07| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2021-03-23| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-05-18| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 09/11/2012, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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JP2011-247090|2011-11-11|

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JP2011247090|2011-11-11|

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PCT/JP2012/079189|WO2013069795A1|2011-11-11|2012-11-09|Focal point adjustment device, image capture device, and lens barrel|

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