• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    A visual compensation system (10) for observing an optical axis (X) of observation with an optical correction of variable power comprises a first optical element (2) movable in rotation centered on the optical axis (X) and having a first cylindrical power along the optical axis (X), a second optical element (4) movable in rotation centered on the optical axis (X) and having a second cylindrical power along the optical axis (X) and a lens (6) having as axis said optical axis (X) and variable spherical power.
    公开号:FR3016705A1
    申请号:FR1450433
    申请日:2014-01-20
    公开日:2015-07-24
    发明作者:Michel Nauche；Stephane Boutinon
    申请人:Essilor International Compagnie Generale dOptique SA；
    IPC主号:
    专利说明:

    [0001] TECHNICAL FIELD TO WHICH THE INVENTION RELATES The present invention relates generally to the field of optometry. It relates more particularly to a visual compensation system and a binocular optometry device comprising such a system. BACKGROUND ART In the context of measuring the visual acuity of a patient, it has already been proposed to simulate the visual compensation to be provided, for example by means of test glasses or a refractor, such as a refraction head.
    [0002] The test glasses can successively accommodate test glasses having different corrections, until finding the correct correction for the patient. This solution is not practical and requires the separate storage of the test glasses in dedicated boxes. It further involves lens changes that cause undesired and non-continuous correction power transitions. In the refraction head, the test lenses are placed on several disks, driven in rotation manually or with the aid of a motorized mechanism. However, it is understood that such an object has a large size and weight, related to the number of glasses placed on each disc. In addition, the field of view through the refraction head is limited ("tunnel" effect) because of the plurality of lenses aligned to obtain various correction values.Before presenting the invention, we recall some definitions of concepts used in the following description Optical power represents the degree to which an optical element can converge or diverge light rays.It is expressed in diopter and corresponds to the inverse of the focal length in meters. spherical when the optical power is the same in all the meridian planes of the lens (symmetry of revolution around the optical axis) .On the contrary we speak of astigmatism when the optical power varies according to the meridians of the lens. case of an optical element having astigmatism, it is called cylindrical power which is the difference between the maximum optical power according to a first meridian and the optical power e minimum according to a second meridian. This is the case of toric or cylindrical surfaces.
    [0003] OBJECT OF THE INVENTION In this context, the present invention proposes a visual compensation system making it possible to observe according to an optical observation axis with an optical correction of variable power, characterized in that it comprises a first optical element movable in rotation centered on the optical axis and having a first cylindrical power along the optical axis, a second optical element movable in rotation centered on the optical axis and having a second cylindrical power along the optical axis, and a lens having as its axis said optical axis and variable spherical power. The first optical element and the second optical element may be rotatable independently of one another so that, in at least one position, the resulting cylindrical power generated by the combination of the first optical element and the second optical element , has a negligible value, for example less than 0.1 diopter, or even a zero value. In practice, the absolute value of the second cylindrical power is, for example, equal to (or at least almost equal to) the absolute value of the first cylindrical power, so that said resultant cylindrical power value is zero (or almost zero). in at least one position. In other words, in this case, the second cylindrical power is equal to or opposite to the first cylindrical power. The first cylindrical power and the second cylindrical power, however, may be different in order to compensate for the spacing between the two lenses (according to the Gullstrand formula) so as to obtain an alignment whose combined cylindrical (ie resultant) power vanishes in at least one position. Thus, by varying the angular position of the first optical element 30 (angle α1 in the following description) and the angular position of the second optical element (angle α2 in the description which follows), independently of one another, as well as that the spherical power Sv of the variable spherical power lens, the spherical power S, the cylindrical power C and the astigmatism angle α of the system (formed by the first optical element, the second optical element and the variable spherical power lens) over predefined ranges, as explained in the following description. In particular, thanks to the possibility of varying the relative orientation of the two cylindrical power optical elements, there is at least one position of the system for which the cylindrical power C of the system is reduced. When the first cylindrical power and the second cylindrical power are equal or almost equal in absolute value, there is at least one relative position of these two elements for which the cylindrical power C of the system is negligible, or even zero. It is thus able to generate a spherical power correction only. It should also be noted that the variable spherical power makes it possible in particular to compensate the spherical power created by the combination of the cylindrical power optical elements, either to cancel it or to obtain in total (for the entire system) a spherical power. in accordance with the desired spherical power. Thus, the spherical power induced by the combination of the first optical element and the second optical element can be at least partly compensated by the variable spherical power lens. This visual compensation system is thus particularly well adapted to generate variable corrections; it also has a small footprint because three optical elements are sufficient to make variable corrections in the aforementioned parameter ranges. This system also makes it possible to perform the function of the crossed cylinders by reversing, by rapid rotation of the two optical elements with cylindrical power. To achieve this function (frequently used in refraction protocols), a cross-twin is used consisting of two plane-cylindrical glasses, perpendicular axes, opposite signs and identical powers. Its spherical power is zero, it is used to vary very quickly the value of the cylindrical power by turning the twin cylinder. This rapid variation is achievable here without the addition of additional optical elements, by rotating the first optical element and the second optical element in concert rotation. There may be provided a first mechanism driven by a first motor and adapted to move the first optical element in rotation centered on the optical axis, as well as possibly a second mechanism driven by a second motor and adapted to move the second optical element in rotation. centered on the optical axis. The first mechanism and the first motor, on the one hand, and the second mechanism and the second motor, on the other hand, form respectively a first actuator and a second actuator, each of which allows the adjustment in position of one of the first and second optical elements. The visual compensation system may comprise a control element adapted to respectively control the first motor and the second motor based on setpoint information, for example, setpoint information received from a remote operated by a user of the system. The control element comprises, for example, a temperature sensor and / or an orientation or motion sensor designed to deliver orientation information. It can thus be provided in particular that the control element 15 comprises a computer designed to generate control signals as a function of at least one of said setpoint information and of said orientation information and to transmit the control signals respectively to first motor and second motor. The control signals sent to the motor will thus take into account the orientation of the visual compensation system, for example to compensate for the effects of power induced on the liquid lens due to gravity. The first mechanism may comprise a first gear which cooperates for example with a first worm secured to a drive shaft of the first motor; the first optical element can then be mounted on the first gear. Similarly, the second mechanism may comprise a second gear which cooperates for example with a second worm secured to a drive shaft of the second motor; the second optical element can then be mounted on the second gear. Such mechanisms allow a reduction of the movement at the output of the engine. The visual compensation system thus has a particularly fine resolution and the parameters S, C, a, which define the correction of the system, can thus take an almost continuous set of values over the aforementioned ranges. In addition, thanks to such mechanisms, the gears, and thus the optical elements carried by these gears, are held in position even in the absence of motor power. The visual compensation system may be housed in a housing formed for example of the assembly of at least a first portion and a second portion; it can then be provided that the first toothed wheel is rotatably mounted on said first portion and the second toothed wheel is rotatably mounted on said second portion. The first motor is for example mounted on said first part and / or the second motor is for example mounted on said second part.
    [0004] It can also be provided that a third mechanism driven by a third motor is designed to drive in rotation a control ring of the spherical power of the variable spherical power lens. The spherical power can thus also be adjusted by means of an actuator formed of the third motor and the third mechanism.
    [0005] The third mechanism comprises for example a third gear which cooperates with a third worm secured to a drive shaft of the third motor, the control ring being integral with the third gear. The first motor, the second motor and the third motor are for example arranged so as to release a circular geometry over at least 120 °, for example over 180 °, centered on the optical axis as close as possible to the useful radius of the lenses, by example at a distance less than 20 mm (or even less than 10 mm) of the effective radius of the lenses; this gives a set of reduced size. The already mentioned control element (for example by means of its already mentioned computer) may be designed to generate at least one control signal for the third motor as a function of at least one of said setpoints and a temperature information generated by the temperature sensor. It is thus possible to compensate for variations in spherical power of the variable spherical power lens due to possible variations in temperature. The housing can also include a third part, the third motor can then be mounted in the third part. According to conceivable embodiments (for example that described below), the first optical element is a first diopter formed on one face of a first plane-cylinder lens and / or the second optical element is a second diopter formed on a first face of a second plane-cylinder lens. Specifically, it can be provided that the first lens is a convex plane-cylinder lens and / or that the second lens is a concave plane-cylinder lens.
    [0006] The invention also proposes a binocular optometry device comprising two optical systems, mounted for example on a common support, in which one of the two optical systems (or even each of the two optical systems) is a visual compensation system as presented above. .
    [0007] DETAILED DESCRIPTION OF AN EXEMPLARY EMBODIMENT The following description with reference to the accompanying drawings, given as non-limiting examples, will make it clear what the invention consists of and how it can be achieved. In the accompanying drawings: - Figure 1 shows schematically the optical elements used in an exemplary implementation of the invention; FIG. 2 represents a sectional view of an exemplary visual compensation system according to the teachings of the invention; - Figure 3 shows a broken view of the compensation system of Figure 2 cylindrical lens side; FIG. 4 is a cutaway view of the compensation system of FIG. 2, variable spherical lens side; FIG. 5 diagrammatically represents a control element of the visual compensation system of FIG. 2.
    [0008] In Figure 1 are schematically shown the main optical elements of an exemplary visual compensation system according to the teachings of the invention. These optical elements comprise a convex plane-cylinder lens 2, of cylindrical power Co, a concave plane-cylinder lens 4, of negative cylindrical power -Co, and a lens 6 of variable spherical power Sv. The absolute value (or module), here Co, the cylindrical power (here -Co) of the concave plane-cylinder lens 4 is therefore equal to the absolute value (Co) (or modulus) of the cylindrical power (Co) of the convex plane-cylinder lens 2. These three lenses 2, 4, 6 are placed on the same optical axis X.
    [0009] Specifically, each of the three lenses 2, 4, 6 has a generally cylindrical outer shape, centered on the optical axis X. In the example described here, the lenses 2, 4, 6 respectively have the following dimensions (measuring their dimensions). 25 mm, 25 mm, 20 mm.
    [0010] It should be noted that it is preferable to use this visual compensation system 10 by positioning the patient's eye on the side of the variable spherical power lens 6 so that the cylindrical power lenses 2, 4, moreover large diameter, do not limit the field of vision defined by the variable spherical power lens 6, which is itself wide because of the proximity of the patient's eye. Each of the three lenses 2, 4, 6 comprises a first plane face, perpendicular to the optical axis X, and a second face, opposite to the first face and optically active: the optically active face of the lens 2 is cylindrical in shape convex (the axis Y1 of the cylinder defining this face being perpendicular to the optical axis X); the optically active face of the lens 4 is of concave cylindrical shape (the axis Y2 of the cylinder defining this face being perpendicular to the optical axis X); the optically active face of the lens 6 of variable spherical power Sv is deformable and can thus take a convex spherical shape (as illustrated in dashed lines in FIG. 1), a planar shape or a concave spherical shape (as shown in solid lines) . The lens 6 of variable spherical power Sv is, for example, a lens of the type described in document EP 2 034 338. Such a lens comprises a cavity closed by a transparent deformable membrane and a movable transparent flat wall; the cavity contains a transparent liquid of constant volume which is more or less constrained by the moving face, in order to deform the membrane which is therefore a spherical concave surface, a flat surface, or a spherical convex surface. In the lens used, a transformation of movement carried out by a screw nut system makes it possible to ensure the translation-rotation movement transformation. In the example described here, the lens 6 has a variable focal length between -40 mm and 40 mm, or a spherical power Sv variable between -25D and 25D (D being the diopter, unit of measurement of the vergence, inverse of the focal length expressed in meters). Moreover, the plane-cylinder lenses 2, 4 respectively have already indicated a cylindrical power -Co and Co, here with Co = 5D. As explained in more detail below, the concave plane-cylinder lens 4 and the convex plane-cylinder lens 2 are rotatably mounted about the X axis (rotation centered on the X axis). The axis Y1 of the convex cylinder formed on the optically active face of the convex plane-cylinder lens 2 can thus form a variable angle α1 with a reference axis Y0 (fixed and perpendicular to the optical axis X).
    [0011] Likewise, the axis Y2 of the concave cylinder formed on the optically active face of the concave plane-cylinder lens 4 can form a variable angle a2 with the reference axis Yo. By calculating the vergence on the various meridians, the following formulas are obtained for the spherical power S, the cylindrical power C and the angle of astigmatism a of the system formed by the three optical elements 2, 4, 6 which has just been describes: cos 2a2 - cos 2a1 sin (a + 2) C = C (cos 2 (a - a,) - cos 2 (a - ai)) (formula 2) tan 2a - sin 2a2 sin 2ai cos (a + a 2) (formula 1) s = s. - -vs . (formula 3). 2 Note that the term (-C / 2) in formula 3 corresponds to spherical power generated by the resultant of the two cylindrical power lenses. By controlling the rotational position of the convex plane-cylinder lens 2 and the rotational position of the concave plane-cylinder lens 4, independently of each other, as described hereinafter, each of the angles al, a2 from 0 ° to 360 ° and thus obtain a cylindrical power C adjustable between -2.00 and 2.00 (here between -10D and 10D), and for any angle of astigmatism adjustable between 0 ° and 360 ° obtained by a simultaneous control of the two lenses. As indicated by the formula number 3, the spherical power resultant induced by the resultant of the orientation of the 2 cylindrical lenses is compensated by means of the spherical lens of variable power. Moreover, by varying the spherical power Sv of the spherical lens 6, it is possible to adjust the spherical power S of the system formed by the three lenses 2, 4, 6. According to one conceivable variant, the lenses with fixed cylindrical power could have the same cylindrical power Co (positive or negative): it could be two convex plane-cylinder lenses, possibly identical, or, alternatively, two concave plane-cylinder lenses, possibly identical. Indeed, in this case, the spherical power S, the cylindrical power C and the astigmatism angle a of the system formed of these two lenses and a variable spherical power lens are given by the following formulas: tan 2a = sin 2a + sin 2a1 (formula 4) cos 2a 2 + cos 2a 1 C Co (cos 2 (a - a 2) + cos 2 (a - a 1)) (formula 5) s = sfr + co - c. (formula 6) 2 The term Co - C / 2 corresponds to the spherical power induced by the combination of the two cylindrical power lenses. It is therefore also possible in this case to adjust the spherical power S, the cylindrical power C and the angle of astigmatism a, in particular so that the cylindrical power C is zero, by rotating the cylindrical power lenses (independently of the one of the other) and varying the spherical power of the variable spherical power lens. An example of a visual compensation system 10 which uses the optical elements which have just been described is shown in FIG. 2. In the following description, for example, in order to clarify the explanation, terms such as "higher" or "lower" will be used. '', which define an orientation in Figures 2, 3 and 4. It is understood that this orientation is not necessarily applicable to the use that can be made of the described system, use whose only direction of reference is the axis X. The visual compensation system 10 comprises a housing 12 formed of a first portion 14, a second portion 16 and a third portion 18, which extend successively along the optical axis X and are assembled two at two in planes perpendicular to the optical axis X. A first gear 22 is rotatably mounted centered on the optical axis X in the first portion 14 of the housing 12 and carries at its center, in one or provided for this purpose, the convex plane-cylinder lens 2. The first gear 22 and the convex plane-cylinder lens 2 are coaxial; in other words, in section in a plane perpendicular to the optical axis X, the outer circumference of the first toothed wheel 22 and the circumference of the convex plane-cylinder lens 2 form concentric circles centered on the optical axis X. Likewise a second gearwheel 24 is mounted in rotation centered on the optical axis X in the second part 16 of the housing 12 and carries at its center, in an opening provided for this purpose, the concave plane-cylinder lens 4. The second wheel toothed 24 and the concave plane-cylinder lens 4 are coaxial; in other words, in section in a plane perpendicular to the optical axis X, the outer circumference of the second gear 24 and the circumference of the concave plane-cylinder lens 4 form concentric circles centered on the optical axis X. A third gearwheel 27 is mounted in rotation centered on the optical axis X in the third portion 18 of the housing 12. The third gear 27 is integral with a ring provided on the circumference of a housing 26 which carries the power lens 6 spherical variable and allowing the control of the spherical power Sv. The housing 26 of the lens 6 of variable spherical power is mounted in the third portion 18 of the housing 12.
    [0012] As clearly visible in FIG. 3, the first gearwheel 22 is rotated (around the optical axis X) by means of a first motor 42 whose drive shaft carries a first worm 32 which meshes with the first gear wheel 22. The first motor 42 is for example mounted in the first portion 14 of the housing 12.
    [0013] The current position of the first gearwheel 22 is monitored by a first optical cell 52. Similarly, the second gearwheel 24 is rotated about the optical axis X by means of a second motor 44 having an axis of drive carries a second worm 34 which meshes with the second gear 24. The second motor 44 is for example mounted in the second portion 16 of the housing 12. The current position of the second gear 24 is monitored by a second optical cell 54. As shown in FIG. 4, the third gearwheel 27 is in turn rotated (around the optical axis X) by means of a third motor 46 which has a drive shaft on which is mounted a third worm 36 which meshes with the third gear 27. The third motor 46 is for example mounted in the third portion 18 of the housing 12. The current position of the third gear 27 is monitored by a third optical cell 56. The first, second and third motors 42, 44, 46 are for example stepper motors, with a resolution of 20 steps / revolution, controlled here in 8th step (hereinafter micro-step) . Alternatively, these engines could be controlled in 16th step.
    [0014] The internal volume of the housing 12 (as also the internal volume of each of the first, second and third parts 14, 16, 18 in the same way) can be subdivided into a receiving space of the motors 42, 44, 46 (region upper case 12 in Figures 2, 3 and 4) and a receiving space of the optical elements 2, 4, 6 (lower region of the housing 12 in Figures 2, 3 and 4). The receiving space of the motors 42, 44, 46 has a substantially parallelepipedal shape, open (downwards in the figures) in the direction of the receiving space of the optical elements 2, 4, 6 and closed on the opposite side ( upwards in the figures) by an upper face 19 of the housing 12 (the upper face 19 of the housing 12 being formed by the assembly of respective upper faces of the first, second and third parts 14, 16, 18 of the housing 12). The arrangement of the motors 42 44 and 46 is such that it allows to benefit from a 180 ° circular geometry centered on the optical axis closest to the effective radius of the lenses. The receiving space of the optical elements 2, 4, 6 has, opposite the motor receiving space, a cylindrical shape (delimited by the walls of the housing 12) which matches that of the third gear 27 on half of the circumference of it.
    [0015] In other words, the housing 12 (and consequently each of the first, second and third parts 14, 16, 18 of the housing 12) has, at the receiving space of the optical elements 2, 4, 6, a cylindrical shape of diameter (perpendicular to the optical axis X) of the same order as, and slightly greater than, that of the third gear wheel 27. The respective diameters of the gear wheels 22, 24, 27 are adapted to promote the conservation of the field by despite the thickness of the optical system. The first motor 42 and the first worm 32 extend in the housing 12 in a direction Z perpendicular to the upper face of the housing 12 (and therefore in particular perpendicular to the optical axis X) so that the first motor 42 is housed in the engine receiving space while the first worm 32 extends into the receiving space of the optical elements.
    [0016] The second motor 44 and the second worm 34 extend in turn in the housing 12 in the same direction, but opposite the first motor 42 and the first worm 34 relative to the cylindrical power lenses. 2, 4. The second motor 44 is housed in the engine receiving space while the second worm 34 extends into the receiving space of the optical elements. Note that thus the first worm 32 and the second worm 34 are located on either side of the assembly formed by the first gear 22 and the second gear 24, and that the lateral space (along a Y axis perpendicular to the aforementioned X and Z axes) of these different parts (first worm 32, second worm 34, first or second gear 22, 24) is smaller than the diameter of the third gear 27 of so that the first and second worm 32, 34 contain in the receiving space optical elements without the need for growth to accommodate them.
    [0017] Moreover, the first and second motors 42, 44 each have a space along the optical axis X greater than that of each of the first and second gears 22, 24, and even greater than that of each of the first and second parts 14, However, since these first and second motors 42, 44 are placed as just indicated on each side of the housing 12 (relative to the Z axis), they can each occupy a space which extends along the optical axis X to the right of the first portion 14 and the second portion 16 of the housing 12. For example, each of the first and second motors 42, 44 has a lateral size (external diameter of the motor) between 6 and 12, for example 10 mm, while the first and second gears 22, 24 each have a thickness (size along the X axis) of between 1 and 4, for example 2.5 mm. On the other hand, the third motor 46 and the third worm 36 are located in the engine receiving space, in the region that extends along the X axis to the right of the third portion 18 of the housing 12. third worm gear 36 engages the third gearwheel 27 in an upper part thereof, which allows the housing 12 to match the shape of the housing 12 in the lower part of the third gearwheel 27, as already indicated.
    [0018] In the example described, as visible in FIG. 4, the axis of the third motor 46 and of the third worm 36 is slightly inclined with respect to the upper face of the housing 12 (precisely with respect to the aforementioned Y axis) . For example, it is provided that the thickness of the third gear 27 is between 0.3 mm and 2 mm.
    [0019] This arrangement of the various elements makes it possible to obtain a relatively thin package, typically having a thickness of between 15 and 20 mm. The housing 12 also comprises, for example in the upper region of the engine receiving space, a control element 50, here formed of several integrated circuits carried by a common printed circuit.
    [0020] Furthermore, a battery-type electrical energy storage device 58 (or, alternatively, a super capacity) is provided to make the device autonomous. For example, non-contact charging elements of the energy storage device 58 are also provided for example. The battery 58 notably enables the power supply of the motors 42, 44, 46 and the control element 50.
    [0021] The main elements of such a control element 50, as well as their connection to the aforementioned motors 42, 44, 46 and optical cells 52, 54, 56, are shown schematically in FIG. 5. The control element 50 comprises a reception module 60 designed to receive, here via a wireless link, the setpoint information, that is to say information indicative of the values desired by the user for the spherical power S, the cylindrical power C and the angle of astigmatism a which define the compensation generated by the optical system formed of the optical elements 2, 4, 6.
    [0022] The receiving module 60 is for example an infrared receiving module which receives this set of information from a remote control infrared emission manipulated by the user. As a variant, provision may be made for this setpoint information to be received from a personal computer via a wireless link, for example a wireless local area network; the user could in this case choose values of spherical power S, cylindrical power C and angle of astigmatism a for the visual compensation system by interactive selection on the computer. The reception module 60 transmits the setpoint information S, C, a received to a computer 66 (constituted for example by a processor executing a computer program so as to implement the functions of the computer described hereinafter), specifically to a calculation module 68 implemented by this computer 66. The calculation module 68 calculates the values of the angles α1, α2 and the spherical power value Sv required to obtain the received setpoint values S, C, a. in input, on the basis of the formulas exposed above. In the case where the plane-cylinder lenses 2 and 4 respectively have a cylindrical power - Co and Co, the following formulas are used, for example: a = a - -1 - arcsin C7 / - 2 + - 2C,) 4 C TC + - 2C, 4 1 a, = cx + -arcsin 2 CS, = S + - 2 The computer 66 also implements a control module 70 which receives as input the values of angle α1, α2 and of spherical power Sv calculated by the calculation module 68 and transmits control signals to the motors 42, 44, 46 in order to control each of the motors 42, 44, 46 independently of the others so as to obtain respective positions of the gears 22, 24, 27 which allow to obtain the desired values: - the control module 70 controls the first motor 42 so as to rotate the first gear 22 around the optical axis X to the position where the axis Y1 of the cylindrical surface optically active lens convex plane-cylinder 2 (carried by the first rou e-tooth 22) forms an angle α1 with the reference direction Y0; the control module 70 controls the second motor 44 so as to rotate the second gear 24 around the optical axis X to the position where the axis Y2 of the optically active cylindrical surface of the plane-cylinder lens concave 4 (carried by the second gear 24) forms an angle a2 with the reference direction Yo; the control module 70 controls the third motor 46 so as to rotate the third gear 27 around the optical axis X to the position where the control ring of the variable spherical power controls the calculated spherical power Sv by the calculation module 68. The position of each toothed wheel 22, 24, 27 is known at each instant, respectively, thanks to the optical cells 52, 54, 56 which each measure, on the toothed wheel to which each is associated, the number of teeth having passed through the optical cell with respect to a reference point on the circumference of the wheel concerned (for example toothless). In the example described here, the first motor assembly 42-first worm gear 32-first gearwheel 22, as the second motor assembly 44-second worm gear 34-second gearwheel 24, generates a gear ratio such as a toothed wheel revolution 22, 24 corresponds to 15040 microstep of the associated motor 42, 44. The resolution (angle of rotation of the toothed wheels 22, 24 for a micro-step) is therefore 0.024 ° for the angles ai and a2. The third motor assembly 46-third worm 36-third gear 46 generates meanwhile a reduction of 16640 micro-steps per revolution. The control ring of the variable spherical power is adjustable over an angular range of 120 ° (which corresponds to 5547 micro steps) in order to obtain the spherical power variation from -25D to 25D (ie a range of variation of 50D). The resolution (spherical power variation Sv for a micro step) is therefore 0.009D. It can be expected that, during the passage of initial setpoints al, a2, Sv to new setpoints a'i, a'2, S'y, each of the first, second and third motors 42, 44, 46 are actuated during the same duration T (in seconds), which may possibly depend on the amplitude of one of the setpoint changes (for example of the variation, in absolute value, of spherical power I S'y - Sy I, where I x I is the absolute value of x). For this purpose, the computer 66 determines, for example, the number pi of micro-pitch of the motor 42 allowing the passage of the angle α1 to the angle α'i, the number p2 of the micro-pitch of the motor 44 allowing the passage of the angle a2 at the angle a'2 and the number p3 micro-pitch of the motor 46 allowing the passage of the spherical power Sy to the spherical power S'y. The computer 66 then controls the rotation of the motor 42 at a speed of pi / T micro-steps per second, the rotation of the motor 44 at a speed of p2 / T micro-steps per second and the rotation of the motor 46 at a speed of p3 / T micro-steps per second. The control element 50 also comprises a temperature sensor 62, which delivers a measured ambient temperature information, and an inclinometer 64, for example realized in the form of an accelerometer and which delivers an orientation information of the visual compensation system. 10, for example with respect to the vertical. The computer 66 receives the temperature information from the temperature sensor 62 and the orientation information from the inclinometer 64 and uses this information in the context of determining the commands to be sent to the motors 42, 44, 46. In the example described, the control module 70 uses the temperature information to compensate for the variations of spherical power of the lens 6 due to the temperature (which are of the order of 0.06D / ° C in the example described) and the orientation information in order to compensate for any disturbances of the drive system (motors, worm gear, gears) due to changes in the orientation of the visual compensation system 10.
    权利要求:
    Claims (18)
    [0001]
    REVENDICATIONS1. Visual compensation system (10) for observing an observation optical axis (X) with an optical correction of variable power, characterized in that it comprises: - a first optical element (2) rotatable centered on the optical axis (X) and having a first cylindrical power along the optical axis (X), - a second optical element (4) movable in rotation centered on the optical axis (X) and having a second cylindrical power according to the optical axis (X), a lens (6) having said optical axis axis and variable spherical power.
    [0002]
    Visual compensation system according to claim 1, wherein the first optical element (2) and the second optical element (4) are rotatable independently of one another so that, in at least one position, the resulting cylindrical power, generated by the combination of the first optical element (2) and the second optical element (4), has a value of less than 0.1 diopter.
    [0003]
    A visual compensation system according to claim 1 or 2, wherein the first optical element (2) and the second optical element (4) are rotatable independently of one another so that in at least one position, the resulting cylindrical power, generated by the combination of the first optical element (2) and the second optical element (4), has a zero value.
    [0004]
    Visual compensation system according to one of claims 1 to 3, in which the spherical power induced by the combination of the first optical element (2) and the second optical element (4) is at least partly compensated by the lens ( 6) variable spherical power.
    [0005]
    5. Visual compensation system according to one of claims 1 to 4, wherein the lens (6) of variable spherical power is a deformable lens containing a fluid.
    [0006]
    The visual compensation system according to one of claims 1 to 5, wherein a first mechanism (32, 22) driven by a first motor (42) is adapted to move the first optical element (2) in rotation centered on the optical axis (X) and in which a second mechanism (34, 24) driven by a second motor (44) is arranged to move the second optical element (4) in alignment centered on the optical axis (X).
    [0007]
    The visual compensation system according to one of claims 1 to 6, wherein a third mechanism (36, 27) driven by a third motor (46) is adapted to rotate a spherical power control ring of the variable spherical power lens (6).
    [0008]
    A visual compensation system according to claim 6 or 7, wherein a control element (50) is adapted to respectively control the first motor (42) and the second motor (44) in accordance with setpoint information.
    [0009]
    The visual compensation system of claim 8, wherein the control element (50) comprises a temperature sensor (62).
    [0010]
    The visual compensation system of claim 8 or 9, wherein the control element (50) comprises an orientation or motion sensor (64) adapted to output orientation information.
    [0011]
    The visual compensation system of claim 10, wherein the control element (50) comprises a computer (66) adapted to generate control signals as a function of at least one of said setpoint information and said information. orienting and transmitting the control signals respectively to the first motor (42) and the second motor (44).
    [0012]
    12. Visual compensation system according to one of claims 6 to 11, wherein the first mechanism comprises a first gear (22) which cooperates with a first worm (32) secured to a drive shaft of the first motor (42), the first optical element (2) being mounted on the first gear (22), and wherein the second gear comprises a second gear (24) which cooperates with a second worm (34) integral with a drive shaft of the second motor (44), the second optical element (4) being mounted on the second gear (24).
    [0013]
    13. Visual compensation system according to one of claims 7 to 12, claim 7 being taken in accordance with claim 6, wherein the third mechanism comprises a third gear (27) which cooperates with a third worm (36) integral with a drive shaft of the third motor (46), the control ring being integral with the third gear (27).
    [0014]
    A visual compensation system according to claim 13 in accordance with claim 12, wherein the first motor (42), the second motor (44) and the third motor (46) are arranged to release a circular geometry. at least 120 ° centered on the optical axis (X) at a distance of less than 20 mm from the useful radius of the lenses.
    [0015]
    15. Visual compensation system according to one of claims 1 to 14, wherein the first optical element (2) and the second optical element (4) are separated by a space of dimension less than 1 mm along the optical axis ( X).
    [0016]
    16. Visual compensation system according to one of claims 1 to 15, wherein the first optical element (2) is a first diopter formed on one side of a first plane-cylinder lens and wherein the second optical element (4) ) is a second diopter formed on one side of a second plane-cylinder lens.
    [0017]
    The visual compensation system according to claim 16, wherein the first optical element (2) is a convex plane-cylinder lens and wherein the second optical element (4) is a concave plane-cylinder lens.
    [0018]
    18. Binocular optometry device comprising two optical systems, wherein at least one of the two optical systems is a visual compensation system according to one of claims 1 to 17.
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    同族专利:
    公开号 | 公开日
    JP2017502816A|2017-01-26|
    WO2015107303A1|2015-07-23|
    CN106413523B|2020-03-20|
    EP3096677A1|2016-11-30|
    JP6574202B2|2019-09-11|
    KR102320825B1|2021-11-03|
    CA2937394A1|2015-07-23|
    EP3096677B1|2020-08-05|
    US20160331226A1|2016-11-17|
    US9980639B2|2018-05-29|
    CN106413523A|2017-02-15|
    FR3016705B1|2017-06-16|
    KR20160110400A|2016-09-21|
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    法律状态:
    2016-01-26| PLFP| Fee payment|Year of fee payment: 3 |
    2017-01-25| PLFP| Fee payment|Year of fee payment: 4 |
    2018-01-25| PLFP| Fee payment|Year of fee payment: 5 |
    2018-07-06| TP| Transmission of property|Owner name: ESSILOR INTERNATIONAL, FR Effective date: 20180601 |
    2020-01-27| PLFP| Fee payment|Year of fee payment: 7 |
    2021-01-25| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1450433A|FR3016705B1|2014-01-20|2014-01-20|VISUAL COMPENSATION SYSTEM AND BINOCULAR OPTOMETRY DEVICE|FR1450433A| FR3016705B1|2014-01-20|2014-01-20|VISUAL COMPENSATION SYSTEM AND BINOCULAR OPTOMETRY DEVICE|
    CN201580005134.5A| CN106413523B|2014-01-20|2015-01-15|Vision compensation system and binocular type optometry device|
    EP15704051.0A| EP3096677B1|2014-01-20|2015-01-15|Visual compensation system and optometric binocular device|
    US15/112,538| US9980639B2|2014-01-20|2015-01-15|Visual compensation system and optometric binocular device|
    JP2016564419A| JP6574202B2|2014-01-20|2015-01-15|Vision correction system and binocular device for optometry|
    KR1020167020047A| KR102320825B1|2014-01-20|2015-01-15|Visual compensation system and optometric binocular device|
    CA2937394A| CA2937394A1|2014-01-20|2015-01-15|Visual compensation system and optometric binocular device|
    PCT/FR2015/050103| WO2015107303A1|2014-01-20|2015-01-15|Visual compensation system and optometric binocular device|
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