• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Automatic control of exposure level and contrast correction for a photographic printer is disclosed. The printer uses dynamic masking achieved by modulating the intensity and velocity of a CRT scanning spot. A prescan is employed to evaluate the negative and establish exposure level and contrast grade excursion limits for the subsequent exposure. Different control systems are disclosed for contact printing and projection printing.
    公开号:SU1367868A3
    申请号:SU823382261
    申请日:1982-01-20
    公开日:1988-01-15
    发明作者:Л.Макинтош Вальтер
    申请人:Логитроникс,Инк (Фирма)；
    IPC主号:
    专利说明:

    SAE O5 1
    00
    about: 00

    SP
    The invention relates to film photographic.
    The purpose of the invention is to improve the image quality.
    Figures 1 and 2 show the functional diagram of the device; in FIG. 3, the density calculator of FIG. 4-6 is the arrangement of filters for contact photo printing.
    The device comprises a cathode ray tube 1 of FIGS. 1 and 2 with a fast-scanning system 2 and a slow-scanning system 3, which interact with the fast-scanning generator 4 and the slow-scanning generator 5, respectively. The electron beam tube 1 has a phosphor screen 6, which has phosphor-limited, including x-2o density) existing in reproductive
    Afterglow characteristics are a non-linear function of the current density of the beam 7 of the cathode-ray tube 1. Beam 7 forms a luminous pentograph. The range of current I ;, is 2000/126 or 15.87 and that the logarithm 15.87 is 1.2. Under these conditions, this part of the simulated
    but 8 on the phosphor screen 6, by the intensity of the cathode 19 current of the cathode ray tube 1, with intensity modulation and speed modulation, provides half of the entire density control range of the exposure system.
    Electron beam tube 1, X-ray 9, photomultiplier
    lying on one side of the X-ray image 9 (or a different type of photo original), while on the opposite side of the image 9 mirror 10, photodetector 11 and camera 12 are located in functional sequence. Camera 12 contains a lens 13 and an electrically activated shutter (not shown).
    In one of the preferred embodiments of the invention, the photodetector 11 is a photomultiplier powered by a high voltage source (not yet shown). However, it is possible to use other types of photosensors depending on the level of light needed to activate the sensitive system. The output current of the photodetector 11 1p is the input to the current amplifier 14, which produces an output current that can be within
    thirty
    35
    40
    45
    11, a current amplifier 14, a logarithm circuit 17, an excitation circuit 18, and a cathode 1-9 form a negative feedback loop with intensity modulation. Wherever the density of snapshot 9 is O, the output current of the photo multiplier 1 1 will be approximately 45 μA, the current amplifier 14 will provide a 1000 μA output signal, the output voltage of the Vpop logarithm 17 will be 9.0 V, and the output current 11 of the circuit 19 excitation of the cathode will be equal to 126 µA. Conversely, if the density of image 9 is 2.4, the output current of photomultiplier 11 will be. equal to 2.9 µA, the output of the amplifier 14 of the current will be 63 µA, the output of the logarithm 17 will be the voltage V p, equal to 0.0 V and the output current I | i of the cathode excitation circuit 19 will be equal to 200 µA.
    established 1, aks and 1 ,,
    gans 15 and 16 controls.
    Circuits using semiconductor junctions to obtain a logarithmic current signal generally have a slow response at low currents. Therefore, the current Ip at the point of supply to the logarithm 17 should have a certain amplitude. Although the logarithm operation in this case is in principle simpler, it is also possible to use a quadratic or
    five
    Another similar function with a slight change in the complexity or accuracy of the system. The logarithm circuit 17 takes three input signals and produces three output signals.
    A current of 1 pp, 5 flowing into the circuit 17, provides the output signal V, which is fed through the excitation circuit 18 to the cathode 19 of the cathode ray tube 1 as the current control current of the intensity-modulated beam 1 ,. In a preferred and idealized form, the current is 1 | equal to about 2000 µA: maximum and 126 µA minimum and continuously varies in response to a range of densities (usually from 0 to 2.4 units
    cited photos. The range of current I ;, is 2000/126 or 15.87 and that the logarithm 15.87 is 1.2. Under these conditions, this part of the simulated
    five
    0
    five
    0
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    11, a current amplifier 14, a logarithm circuit 17, an excitation circuit 18, and a cathode 1-9 form a negative feedback loop with intensity modulation. Wherever the density of snapshot 9 is O, the output current of the photo multiplier 1 1 will be approximately 45 μA, the current amplifier 14 will provide a 1000 μA output signal, the output voltage of the Vpop logarithm 17 will be 9.0 V, and the output current 11 of the circuit 19 excitation of the cathode will be equal to 126 µA. Conversely, if the density of image 9 is 2.4, the output current of photomultiplier 11 will be. equal to 2.9 µA, the output of the amplifier 14 of the current will be 63 µA, the output of the logarithm 17 will be the voltage V p, equal to 0.0 V and the output current I | i of the cathode excitation circuit 19 will be equal to 200 µA.
    In these circumstances, the voltage 2d varies from -9.0 to 0.0 V in the density range of image 9, equal to 2.4 units. Consequently, the voltage varies by 3.75 V per decade of change in density. The exposure correction intensity, represented by the light mask on the front panel of cathode ray tube 1, is only 15.87 for a current corresponding to the density range of 1.2, and the output voltage Vj of the 1.7 logarithm circuit represents the density range of 2, A .
    The current f (Trp) forms the second output signal of the logarithm 17; is non-linearly related to the current Ip / wt,. received from the amplifier 14 current. When the current f () in the current
    repeater 20 two sig ig or vice versa. When the output signal
    + V current inverter 22 fast
    The corresponding currents, each of which is denoted 1p „, where Ip, is equal to the current Ip, t, but has the opposite polarity. One of these currents is sent back to the circuit 17 LogarLmirordl t
    sweep breaks current +1 if the output signal is equal to -V, t the output current of inverter 22 becomes 2Q equal to -I pfJ. Each time the trigger 23 changes its state, the single vibrator 26 provides an input pulse for the slow-sweep generator 5, resulting in a stepping from
    Vania for comparison with current I
    PHi
    sweep breaks current +1 if the output signal is -V, then the output current of the inverter 22 becomes 2Q equal to -I pfJ. Each time the trigger 23 changes its state, the single vibrator 26 provides an input pulse for the slow-sweep generator 5, resulting in a stepping of the other current 1p „Comes forward on
    current circuit 21 speed settings
    scan where he can go
    (or be replaced by another current to change the output current due to the needs of the operating slow-sweep system 3, determined by setting the front 27 and rear raster edge adjustments, respectively. So 30
    cycle) as an input signal for the fast-scan current inverter 22. The current inverter 22 generates an output current - | -1.p „or a response to the direction signal from the trigger 23,
    The circuit formed by the fast sweep generator 4 in conjunction with the adjustments of the left 24 and right 25 raster edges and the fast deflection deflection system 2 is known in the art. The generator 4 generates a sweep current for the deflecting system 2, resulting in a transverse movement of the electron beam 7 at a speed linearly related to the amplitude of the current I
    35
    40
    If
    rl "4
    In fact, the considered elements interact to obtain a stepped current deflection of the slow sweep.
    Slow Sweep Trigger 29 provides the output for reset circuit 30 and for start and stop circuit 31. When the output signal of trigger 29 is negative (K, s (reset xm 30) is brought into operation and causes the slow sweep generator 5 to return to its initial state. The start and stop circuit 3 counts negative transitions of trigger 29 and Number of 1-2-4-8 cycles, etc. for slow sweep of the cathode ray tube 1. When the output signal of the trigger 29 is positive, the circuit 31 start and stop through the circuit 33 of the blanking of the cathode ray tube 1 allows the circuit 18 excitation cathode 19, the cathode current 1c is supplied to the cathode ray tube 1. Adjusting the exposure control organ 32 along with the exposure of the number of frames of the exposure cycle also modifies the step size of the stepped current from the pulse, due to regression with the output current 1rdd {photomultiplier 11 and densities existing on Picture 9. That is, a contrast adjustment circuit with speed modulation is created, containing a cathode ray tube 1, shot 9, photomultiplier 11, current amplifier 14, circuit 17 of logarimers an, current repeater 20, a current scan rate setting circuit 21, a fast scan current inverter 22, a fast scan generator 4, and a fast scan deflecting system 2. This circuit is not a negative feedback loop, since the adjustable parameter is the scanning speed electronically.
    This is not a parameter perceived by the photocathode of the photomultiplier 11, for example, illumination. Thus, the fast scan function can be modified or replaced without any interference from the action of the intensity modulation circuit described earlier.
    The output of the fast sweep generator 4 is sensed by the trigger 23, which at each limit of the sweep deviation undergoes a change in state from.
    before - V,
    rdl t
    sweep breaks current +1 if the output signal is equal to -V, then the output current of inverter 22 becomes equal to -I pfJ. Each time the trigger 23 changes its state, the single vibrator 26 provides an input pulse for the slow-sweep generator 5, which results in a step-by-step idle system 3 slow sweep, determined by the installation of the front adjusting elements 27 and the rear 28 edges of the raster, respectively. So 0
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    Thus, the considered elements interact to obtain a stepped current deviation of the slow sweep.
    The slow-scan trigger 29 provides an output for the reset circuit 30 and for the start and stop circuit 31. When the output signal of the trigger 29 is negative (K, s (reset xm 30) is brought into operation and causes the slow sweep generator 5 to return to its initial state. The start and stop circuit 3 counts the negative transitions of the trigger 29 and Number of 1-2-4-8 cycles, etc. for slow sweep of the cathode ray tube 1. When the output signal of the trigger 29 is positive, the circuit 31 start and stop through the circuit 33 of the blanking of the cathode ray tube 1 allows the circuit 18 excitation of the cathode 19, supplying the cathode current 1c to the cathode ray tube 1. Adjusting the exposure control organ 32 along with the effect of the number of frames of the exposure cycle also modifies the step size of the stepped current from r.
    0
    five
    nerator 5 slow scan. Together, these two factors regulate the gross exposure level of a photo printing device, which is pre-calibrated by sensitivity (or photographic speed) of a sensitive emulsion in chamber 12.
    The logarithm circuit 17 receives an additional input signal — an exposure level (masking degree) —and the circuit 17 provides an additional output signal, denoted as density. The input signal is the level of exposure (masking degree ELDG) comes from block 34 of masking degree and exposure level. The ELDG input signal can control the circuit 17. In one extreme position, the ELDG input signal can suppress the input signal Ip ,, t for the circuit 1 7 from the current amplifier 14 and the output signals will only be from the ELDG signal This condition exists when the switch 35 is set to mask - Vani in the position when the degree of masking is zero. In this scheme, the logarithm 17 responds only to the setting of the .36 level-exposure switch through the block 34 of masking and exposure level 34. If the mask level switch 35 is in the other extreme position, the seventh, the block 34 will be completely closed and the I7 circuit will
    The children only respond to the current Ip. from the current amplifier 14. At the positions of the switch 35, the masking degree is from 1 to 6. The circuit 17 is affected by the input signals I pMt and ELDG with interconnected values. The output signal from block 35 to block 34 post is in octal form.
    In the preferred embodiment, the switch of the pre-position exposure signal level 36 has 15 hand-set positions, the adjusting member 32
    equivalent to areas of density from 0.3 to 1.7 in the snapshot 9, and creates for the block 34 an output signal in hexadecimal form. In case of setting the switch 35 of the masking degree to the zero position, these signal levels through the switch 34 of the masking degree and the exposure level will create a voltage V and a current f (Ip) at the outputs of the circuit 17
    fo
    -pMiJ
    equal to the values that would be obtained from photographic densities of the same size in the picture 9
    5 0 5 About
    five
    0
    OR any other photo original. Therefore, the cathode current Hz of the electron-beam tube 1 and the speed unwind. The electron beam powers 7 will be the same values that would be obtained from the corresponding photographic densities.
    When considering the operation of the circuit (Fig. 1) in the preliminary scanning mode, let us assume that the masking degree switch 35 and the exposure level switch 36 are set to each in the position indicated by A. Each switch has an output line to prevent prescanning through block 37 Setting the switch to 35 masking degree or switch 36 to the exposure level or both together to position A means that an automatic pre-scan is desired, which will begin when the exposure is initiated. zitsii via Snap Switches circuit 38 ents exposure start. If none of the switches is in position A, prohibition block 37 will be activated and the preliminary scanning mode will be bypassed.
    When the trigger switch 38 is activated, the inhibit signal is removed from the slow-sweep generator 5 and, through the reset circuit 30, the output signal of said oscillator will cause the electron beam 7 of the cathode ray tube 1 to return. At the same time, the prescan logic 39 is activated, providing signals to the block 34 of masking degree and exposure level to generator 40 of the saw.
    0
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    the exposure number, the pre-scan compression circuit 41, the one-shot 26, the current speed and scan circuit 22 and the control member (not shown) of the camera 12 and the shutter. Scheme 41 compression; prescanning reduces the front, rear, left and effective limits by about 15%. the right edges of the raster, limiting as a result the measurement of 70% of the central image area. Generator 40 sawtooth pre
    7
    Iprt "a
    the scan will provide a continuous current flow to the slow-sweep generator 5, the exposure adjustment body 32 and the one-oscillator 26 will be blocked, and the current sweep speed setting circuit 26 will be switched from the current to another constant current of 1.0 mA. Finally, the control of the camera 12 and the shutter will be blocked so that the solenoid (not shown) of the shutter remains inactive, and the block 34 of the masking degree and the exposure level is blocked to prevent the occurrence of errors.
    When the slow-scan trigger 29 detects the limiting raster scanning current, its output signal will change to + E, and the cathode 19 excitation circuit 18 will be able to open through the generator 33 and the start and stop circuit 31. As a result, in the circuit consisting of cathode ray tube 1, snapshot 9, photomultiplier 11, current amplifier 14, logarithm circuit 17 and cathode 19 excitation circuit 18, which creates current 1, the limits are removed, then the voltage. at any time during the pre-scan will represent the mirror density of the snapshot 9. The pre-scan generator 40 and the included current scanning speed settings 21 will cooperate to get together with the fast sweep generator 4 and - the slow raster generator 5 with certain characteristics which will not affect the density properties of snapshot 9. A constant scanning speed will provide a fast sweep of an electron, electron beam 7 with a constant speed w., equal in the preferred embodiment about 20,000 inches / sec (508 m / s).
    The prescan takes about 200 ms. Then, for the largest pre-scan raster, a linear contour of 4000 inches (101.6 m) will be traced. A 15x18 inch (38.1 X 45.72 cm) raster has an area of, for example, 270 square inches (1742 cm). If the prescan is only 85%
    -
    3678688
    on each axis, the area being monitored will be in the order of 200 square meters. inches (1290 cm), and each square inch when scanning is equivalent to 20 linear inches (50.8 s) This factor is extremely, as it represents the area conversion, defined as the product of function XV, as a simple counting pulses.
    In the prescan mode, the output V of circuit 17 represents the density of snapshot 9
    5 at any scanned point (provided that this density is equal to or less than the maximum allowed by the known contrast limitations of the front panel of the cathode ray tube). It follows that the line identified as the output density line can transmit a certain linear function Vp R to the preferred case V p and
    5 density is the same. A maximum scanning speed of 20,000 inches per second can only be achieved when the afterglow of the phosphor, which is a non-linear screen load function in terms of beam current per square centimeter of the phosphor scanned, and can be ignored, for example, X or less, can be neglected. Hence the use of pre-scan with intensity modulation at maximum density. Can provide an afterglow in the 5th ISS on the screen for D „„. at a beam current of 2000 μA, while the luminophore lag time may be
    0
    five
    50 MKS for V, „„ at I 1- 126 μA. When combined with intensity modulation with velocity modulation, all sensed densities have double
    5 is the total value, and the afterglow of the phosphor when attenuating to 10% and the cathode current of 126 µA is in electronic circuits, as if the afterglow is reduced to 1%. This effect will not be scanned with a constant intensity and a constant speed, since this measurement will require the perception of the entire dynamic change. In addition, if the system uses only prescanning with intensity modulation, a change in the beam current of cathode ray tube 1 and the screen load range can
    five
    become much more along with the resulting afterglow. Similarly, if the preliminary scanning was performed only with the modulus of speed and the sensitivity of the photomultiplier 11 remained constant, then the measurement made would also be outside the full dynamic range of densities. The level of forest luminescence will be in the order of 1% and in order to prevent the phosphor from burning out, it will be necessary to provide a constant and moderate screen load.
    Preliminary scanning with intensity modulation in a scanning electronic system of photo printing with speed modulation and intensity modulation allows for much more accurate density measurements for any given phosphor and at high scanning speeds.
    Among others, prescanning logic 39 controls a clock generator 42, a peak detector D
    43, the peak detector G 44 and the analog-digital integrator 45 density. During the auxiliary mode of the photo printing device, prior to the prescan, the peak detectors 43 and 44 are in the reset or cleared state; the clock generator 42 is turned off, the density integrator 45 is reset to zero. From the beginning of the prescan, the tact generator 42 is valid until the end of the prescan period and provides two output signals; 45 density integrator, another 46 square integrator. Integration of area data during raster scanning can be performed in digital form, in this case a 12-bit counter of a known type. The density integrator 45 consists of a typical integrator connected to such a 12-bit counter. The output signal of the density integrator 45 is divided into a circuit 47 by the output signal from the area integrator 46, resulting in an output signal creeping into the density combiner 48. In this embodiment, Djuhi is an analog voltage with a level of 9.0 V for a density of 0.0 and 0.0 V for a density of 2.4. Peak detectors May and D "(43 and 44
    monitor the output signal density from circuit 17. They are reset to zero before the start of the preliminary scan and sample the deviations from the line density during the preliminary scan. At the end of the scan, the output of the peak detector D 44 must be a voltage approaching 9.0 V as the upper limit, and the output voltage of the peak detector in Transaction 3 approaches 0.0 V as the lower limit.
    D and D values
    as voltages, they are applied to a density combination circuit 48 (FIG. 3), which depicts a combination method of these signals for
    receiving signal: D
    S-All in
    This is a combination5 0
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    0
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    0
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    This is present in such a way that the exposure level from prescan D can be used in any known photo class. The mixing equation for the combination of densities 48 is written as:
    DCOM. (l-K) (1-K) ha) m "n +
    + K (k) ,, where D.
    min
    D,
    D
    sum
    D
    Comj
    to
    minimum detected peak input density; maximum detected peak input density; integral input density;
    combining output density;
    fraction representing positional bias of the knob of the potentiometer 50 (fig.Z); k is a fraction representing the positional displacement of the knob of potentiometer 50 (Fig. 3); From FIG. 3 and the equation, it is obvious that with the help of two potentiometric adjustments, any exposure level is available within the limits of AI Oman. The output signal D. of the density coupler 48 is one of the input signals for the masking degree module 34 and the exposure level, and if the exposure level switch 36 is set to A, the soma signal will be the exposure level used during the exposure scan after the preliminary scan. Output signals.;. H D peak detek0
    The tori 43 and 44 are stepped as input signals to the detector 49, the output / JD signal of which is fed to the converter 5 masking degree. The 4D signal has a first limit in the form of a voltage of 0.0B and a second limit in the form of some predetermined voltage. In the preferred embodiment of the design B., “
    TM ((C
    is a voltage equivalent to a density of 2.4. The masking degree converter 51 converts an analog signal that amplifies the density range of snapshot 9 into a digital masking degree that is in the range of 0-7, and transforms it into an octal code per module 34.
    The basis for converting the degree of masking is to compare the density range of the reproduced photographic original with the known value of the density range acceptable for the reproduction emulsion. The last of the snapshots is entered into the pre-scan system through a contrast ratio adjustment potentiometer 52 interworking with a masking degree converter 51. So, for example, if the reproductive ability of a sensitive emulsion lies in the density range of 1.5 and the iD value of image 9 is 0.9 in the first case, 1.7 in the second and 3.0 in the third, then in the first case no masking is necessary, the second case requires masking at level 2 and in the third case at level 7.
    Although the entire description of the system was given for a black-and-white photo printing device, the principles disclosed in it are also suitable for a color photo printing device, where the color-scaled image also needs to be coordinated with the paper used for printing and more difficult to adjust the contrast of the image.
    smaller steppes, gradations of contrast - Q is sensitive, or not 57 color paper. When panchromatic is used, then filters 60
    The SRI of the cathode ray tube 1 with suitable spectral radiation, the invention can be used to create electronic light masks that are adjustable with respect to each of the primary colors contained in the color reproduction, as well as the electronic contrast correction of the neutral component of the reproduced image,
    Detectors and L ,,,,. and i-A are selected schemes: x; ; i; - .; ;. Similarly, 1c; p.1tor of density and integrator; 6 squares are stored in a fifth flattening calculation during the whole exposure mode before they are reset to zero.
    Consequently, the densitometric information obtained during the prescan is stored
    during the exposure mode for reference using unit 34. If desired, separate storage schemes for peak detectors 43 and 44 and for dividing circuit 47 can be provided.
    Thanks to this operator, more time will be given to view the depicometric information and to select the manual or automatic control of the printing device.
    The above description has mainly addressed the conditions associated with non-contact printing, when a projection is required for a reduction or enlargement operation.
    through the lens 13 interacting with the shutter to prevent photographic exposure to the desired moment. There is no such condition in contact printing, when the shutter cannot be placed between the transparent original and the unexposed film on which the reproduction should be performed. Therefore, to carry out a preliminary scan for contact printing, certain modifications of the basic principle of FIGS. 4-6 are required.
    Directly above the projection lens 13 are solenoidal
    nodes 53 and 54 of the rotation of the filter 55, the plate 56 is smoothly supported, the photo is taken from the photo original 9, the emulsion 57 is sensitive, the salt-forming nodes 58 and 59 of the filter 60 of the photomultiplier 11. If
    55
    and 5 can be selected for the spectrum band outside the sensitivity range of the emulsion 57, but within the spectral range of the photomultiplier 1. If the photographic panchromatic emulsion is 5, then the filters 60 and 55 must be neutral and with such a density that
    but reduce the exposure inherent in 1 point of prescan.
    Figures 4 through 6 show the locations of the filter assemblies 59 and 54 in the preliminary scanning mode (Fig. 6) and in the exposure mode (Fig. 5). During the preliminary scan, the filter 55 closes the lens 13 and reduces the actinic coverage of the photographic emulsion 57 to a low level. Since the photomultiplier .11 is not covered by filter 60, its optical sensitivity is high and the low level of light passing through image 9 and emulsion 57 results in an output current to the photomultiplier 11. After a preliminary scan, the filter 55 is rotated to the position shown in FIG. .5, and the level of actinic lighting for photographic emulsion 57 becomes large. Conversely, the filter 60 of the photomultiplier 11 reduces the level of light on it, ensuring its low sensitivity. However, the low sensitivity of the photomultiplier 11 and the high level of light are combined to produce an output current K. The interleaved arrangement of the filters 60 and 55 on the optical paths shown in FIGS. 6 and 5 ensures that the measurement sensitivity remains constant along with the zero exposure of the sensitive emulsion 57 during prescan. The pre-scan density measurements are diffusive due to the location of the sensitive emulsion 57, and the subsequent scanning exposure is performed in a contact mode.
    In essence, the pre-scan operation in a photo printing scanning electronic masking device can be brought automatically and in place relative to the subsequent main exposure. Two types of density information are obtained using a preliminary scan, this is a combination of all scanned points Dgy and measuring the extreme values of density В „and ctuc. At the request of the user, it is possible to combine the crawled density data to obtain an appropriate exposure level consistent with the sensory emulsion and class reproduced photos.
    6786814
    The prescan is adjusted to fit a wide range of formats and is limited to the central part of the image area, taking millisecond intervals. The range of contrast during printing is automatically assessed and the degree of masking is selected according to the parameters of the applied photographic emulsion. The preliminary scanning system is adapted for contact and for projection printing and can be activated 15 on or off at the user's discretion.
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    权利要求:
    Claims (2)
    [1]
    1. Device for adjusting contrast, density and exposure level in contact or projection photo printing, containing a source of radiant energy, nodes for placing negatives and photographic material, an objective lens and a photomultiplier electrically connected to the first input of the inverter, the output of which is connected to the first input of the generator the fast sweep is associated with the left and right raster adjusting controls, and the output of the fast sweep generator is connected with the trigger input of the fast sweep, the output of which is connected to the second current inverter one, exposure level unit, current, repeater and connected to the front and rear edge regulators a slow-sweep generator, the output of which is connected to the slow-trigger trigger input, output connected to the first input of the start and stop circuit, equipped with a start switch, second the input of which is connected 5- to the first output of the exposure number control circuit, the second output of which is connected to the first input of the slow-sweep generator, and the input of the zusk circuit and stop through the generator Ani connected to the first input of the circuit of the cathode excitation otlichayusches in that, in order to improve picture quality, the device is provided with gate control circuitry, circuit setting a scanning speed monostable oscillator preliminary scanning circuit compression preliminary scanning and the reset circuit.
    0
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    the first input of the gate control circuit is connected to the first inputs of the scanning speed setting circuit, the second input connected to the first output of the current repeater, and the output to the input of the current inverter and to the one-vibrator connected by the second input to the output of the trigger of fast sweep and to the second input of the inverter current, and the output - with the second input of the slow sweep generator, the third input of which is connected to the second input of the gate control circuit and to the input of the blanking generator, and the fourth, fifth and sixth of it You are connected to the corresponding outputs of the pre-scan generator and the pre-scan compression circuit, the other output of which is connected to the second input of the fast sweep generator, and a reset circuit, the input of which is connected to the output and input of the slow sweep trigger and the start and stop circuit, respectively. the gate control input is also connected; The device is also equipped with a current amplifier with controls, the first input of which is connected to a photomultiplier, a logarithm circuit, an analog-to-digital density integrator, peak-pass detectors, clock generator, area integrator detector, dividing circuit using potentiometer for adjusting the degree of contrast, transducer of degree m skidding, prescanning logic circuit, prescanning prohibition block, density combination and masking degree and exposure level switches, the output and the second input of the current repeater are connected respectively to the first input and the first output of the logarithm circuit, the second and third inputs of which are connected respectively to the output the current amplifier and the output of the block the degree of masking of the exposure, and the second and third outputs of the logarithm circuit are respectively connected to the second input of the cathode excitation circuit and the first input of the analog-digital density integrator, with the first input of the first peak detector and the input of the second peak detector, the first output of which is connected by co.i. the second input of the first peak detector, with the second input directly and with the third input through a clock generator analog-digital density integrator, the output of which is connected to the first input of the dividing circuit,
    the second input and output of which are connected respectively to the output of the area integrator associated with the clock generator and the first input of the density combinator, the output of which is connected
    with the output of the exposure level unit, and the second and third inputs of the density combiner are respectively connected to the output of the first peak detector and the second output of the second peak detector, moreover, these outputs are respectively connected to the detector inputs, the output connected to the first input of the masking degree converter, the second input of which
    connected to the second input of the gate control circuit, and the output of the masking degree converter is connected to the first input of the exposure level unit, the second and third inputs of which are connected via the masking degree switch and the exposure level switch to the input of the preliminary scanning prohibition block, the input of which is connected
    with the first input of the logic circuit
    the pre-scan, the second input of which is connected to the second input of the gate control circuit, the first output of the pre-scan logic circuit is connected to the input of the clock generator, and its second output is connected to the fourth input of the exposure level unit and the first gate control circuit input.
    [2]
    2. The device according to A.1, which is based on the fact that two filters are installed with the possibility of displacement, one of which
    located in front of the lens, goy - in front of the photomultiplier.
    and friend
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    US5003381A|1991-03-26|Method and apparatus for point-by-point reproduction of an original
    US3455632A|1969-07-15|Method of classifying photographic material
    US2968214A|1961-01-17|Modification of the light response from a coloured original
    US2921512A|1960-01-19|Photographic printing
    JPS60184240A|1985-09-19|Image forming device
    US2985086A|1961-05-23|Photographic printing
    CA1207373A|1986-07-08|Dynamic exposure level control of crt light source
    US3876824A|1975-04-08|Density measuring apparatus
    JPH069373B2|1994-02-02|White adjustment method and device
    US3019703A|1962-02-06|Photographic colour reproduction apparatus
    US4728992A|1988-03-01|Process and a device for adjusting a photographic color enlarging or copying apparatus
    US3340360A|1967-09-05|Cathode ray photographic printer having positive feedback
    US2880662A|1959-04-07|Photographic method and apparatus
    US4264163A|1981-04-28|Exposure control apparatus with compensation for film reciprocity failure
    US5218402A|1993-06-08|Color image reproduction with compensating light source
    同族专利:
    公开号 | 公开日
    DD202602A5|1983-09-21|
    SE447425B|1986-11-10|
    JPS57211174A|1982-12-24|
    DE3204581A1|1982-12-30|
    US4344699A|1982-08-17|
    GB2100451B|1985-07-03|
    CH648419A5|1985-03-15|
    GB2100451A|1982-12-22|
    NL193036C|1998-08-04|
    SE8200434L|1982-12-06|
    CA1177411A|1984-11-06|
    NL8105890A|1983-01-03|
    JPH065413B2|1994-01-19|
    FR2507337B1|1989-02-03|
    FR2507337A1|1982-12-10|
    NL193036B|1998-04-01|
    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    US06/270,758|US4344699A|1981-06-05|1981-06-05|Exposure and contrast determination by prescanning in electronic photoprinting systems|
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