SU999002A1 - Electronic copying device - Google Patents

Description

(54) ELECTRONIC COPYING DEVICE

The invention relates to photographs, in particular, to devices for graphic printing with automatic printing; masking and automatic exposure control.

A copying device is known that contains a cathode ray tube - a scanning light source, a deflecting system associated with a scanner unit, a projecting system behind the cathode ray tube, a projection system applied for placing negative and positive, a photomultiplier tube connected to the electron beam tube through a controllable feedback amplifier Cll.

A disadvantage of such devices is the need to make several test prints at different values of the masking coefficient and different values of the exposure value, and the accuracy of determining the values of the masking coefficient and the exposure is determined on the basis of a subjective assessment of the resulting image.

It is also known an electron-copying device containing a cathode-ray tube that deflects

the system of which is connected to the scanner unit, behind the cathode ray tube, an applied glass for accommodating a negative, which is optically coupled through an optical npoeiut system and an optical beam-splitting system with a screen for accommodating a positive photographic material, a video signal extraction channel consisting of

10 photomultiplier tube and a logarithmic converter connected via an analysis-print type switch with feedback amplifier and an analog switch,

The 15 amplitude selector with the first input of the processor, the first output of which is connected to the feedback amplifier, and the second to the first input of the switch, the output of which is connected to

20 by the display, and the second input is the first output of the input block of the characteristic curve of the positive photographic material, the second output of which is connected to the second input of the processor, and the third

Input 25 - to the first output of the synchronous generator, the second output of which is connected to the analog switch C23.

The main disadvantage of the known device is that

30 it is intended for printing black and b -

color-separated negatives, which reduces the possibility of qualitatively interpreting a color image, a color image in pseudo-colors, and the like.

The aim of the invention is to improve the accuracy of image correction in color element printing with electronic masking.

This goal is achieved by adding a three-channel color divider, two optical density signal extraction signals, an additional switch, a stepping motor, and a turret with spolium light filters to the device, and the outputs of each optical density signal are connected to the corresponding inputs of the optical density signal, which outputs through an additional commutator in print mode and a controlled feedback amplifier connected to an exponential terminal to the converter, the output of which is connected to the control electrodes of the cathode ray tube, and in the additional switch position in the analysis mode, the outputs of the matrix unit additional switch, analog switch, amplitude selector are connected to the first input of the processor, the first output of which is connected through a controlled feedback amplifier to the input of the exponential converter, the second output - to the fourth input of the additional switch, the second output of which is connected to the stepping motor, to the shaft which turret is installed with filters located between the negative and proektsiruyuschey optical system, and a fifth additional switch output is connected to the timing generator.

Figure 1 presents the functional diagram of the electronic copying device; Fig. 2 shows an example of the functions analyzed by the operator on the display screen when determining the parameters of the process of item-by-element printing of a color photographic print with masking.

The device includes an electron beam tube 1, a deviating system 2, a block 3 sweeps, a negative 4, an optical projection system, an optical beam-splitting system 6, a positive photographic material 7, a system of dichroic mirrors 8, a three-channel block of 9 photomultiplier tubes and a three-channel block 10 logarithmic converters, which are three channels of optical density signal extraction, unit-11 initiation unit, additional commutator,.; - p 12, controlled feedback amplifier 13, exponential converter 14, tax key 15, amplitude selector 16, processor 17 regulator 18 of the magnitude of the feedback circuit gain, regulator 19 of the exposure magnitude, switch 20, block 21 of inputting the characteristic curve of a color positive photographic material, display 22, synchronous generator 23, stepping motor 24, turret 25 with interchangeable color. folic filter 26 and a through hole 27.

The cathode ray tube 1, the deflecting system 2 of which is connected to the scanner unit 3, scans through negative 4 and folia 26 positive 7. The optical projection system 5 and optical radiant system 6 are installed on the light flux path. The beam splitting system 6 is optically coupled through a system of dichroic mirrors 8 by a three-channel block of 9 photoelectronic photomultipliers, the outputs of which are three-channel block 10 of logarithmic converters and a block 11. Matrixing are connected to the input of an additional com utatora 12, the first output of which is in the analysis mode via the analog switch 15 and the amplitude selector 16 is connected to a first input of processor 17. A second input of the additional switch 12 in the printing mode is connected to a controllable amplifier 13 feedback. The processor 17 contains two groups of regulators: regulators 18 of the magnitude of the feedback circuit gain (coefficients of layer-by-layer masking in the photosensitive layers of the color positive material 7) and regulators 19 of the magnitude of the layer-by-layer exposures. The first output of the processor 17 is connected to the input of a controlled feedback amplifier 13, the output of which is connected via the exponential converter 14 to the input of the cathode-ray tube 1. The second output of the processor 17 is connected to the input of the additional switch 12 and the third output through the switch 20 to the display input 22. To the second input of the switch 20 is connected the first output of the block 21 of the input characteristic curve of color positive photographic material 7, the second output of which is connected to the input of the processor 17.

Claims (2)

The third output of the additional switch 12 via the stepper motor 24 controls the turret 25 with optical filters 26. To ensure synchronous and common-mode operation of the device, the unit 3 sweeps, the additional switch 12, the analog switch 15, the processor 17 is connected to the synchronous generator 23. Electron-copy | roval device works as follows. In order to determine the necessary layer-by-layer masking coefficients and the values of layer-by-layer exposures, upon obtaining a color photographic print with given gradation and color separation characteristics, an analysis of the layer-by-layer gradation characteristics of the negative image is performed. To do this, a color negative 4 is installed in front of the screen of the cathode-ray tube 1, the turret 25 is installed by a through hole 27 to the negative 4. Scanning is negated by the cathode ray tube 1 with a deflecting system with a constant constant 2 by speed. Part of the luminous flux, modulated by the transparencies of negative 4, is discharged through the projection system 5 by the beam-splitting system b onto the system of dichrrée mirrors 8, from the output of which the color-separated light flows go to the optical inputs of the three-coded block 9 of logarithmic converters that convert the transparency signals into optical signals KOJi density, which then through the block 11 matrixing fed to the input of the additional switch 12, which has two modes of operation mode of operation analysis and print mode. In the analysis mode, the additional switch 12 is ordered by the processor 17 in turn, by scanning cycles, the separation of the optical density signals is connected to the input of the analog switch 15, i.e. converts parallel G ““ oGa e1 G ° ”- In the print mode, the additional switch 12 controls via a stepper motor 24, a turret 25 with light filters 26, i.e. sets the layer-by-layer exposure through the corresponding light filter of the positive photographic material 7, and also connects the color separation channel to the input of the controlled feedback amplifier 13 connected to the processor 17, i.e. provides the ability to mask images in a layer in print mode. For the common mode switching liver, the additional switch 12 is connected to the output of the clock generator 23. In the analog switch 15, the amplitude values of the color separated optical density signals are detected by voltage pulses fed to the second input of the analog switch 15 from the sync generator 23. From the output of the analog switch 15. the modulated pulses of successive colors of the chip. optical density signals are fed to the input of the amplitude selector 16, where they are measured in amplitude and in accordance with the value measured the amplitudes are distributed over the three channels of the storage device 17, where their numbers are counted for each color separation density. Thus, three histograms of optical color separated image densities of negative 4 are sequentially formed in the storage part of processor 17. The obtained histograms are output to the display screen 22 via switch 20. Display characteristic curves of color positive photo material 7 are connected to the second input of switch 20 through the switch 20, is also output to the screen of the display 22 and simultaneously received at the second input of the processor 17, where it is recorded in a memory device. The characteristic curves in the storage device of the processor 17 and on the screen of the display 22 occupy their position and tilt in accordance with the photosensitivity and contrast of the photosensitive layers of the color positive photographic material 7. Operator (not shown, observed on the display 22 of the distribution pattern of the effective DJ (density) figure 2 curves 1. 1.1. 2.1. 3) and their position on the axis of optical densities, as well as the type of characteristic curves of a positive photographic material D (2 (fH) and their position and tilt on the axis of the ex Positions (Fig. 2, "". „c .." c "and. -c, - o-, yb1, // 7c P, | feedback (layer masking coefficient) color separations through the functional converter of the processor 17 changes and models histograms of the divided divisions of the masked 1: negative 4 engraving (figure 2, curves 1. 1.2. 2.1. 3), as well as the slope of the characteristic curves of the positive Relative to each other: adjustments 19 of the layer-by-layer exposures through the processor's functional converter 17 sets the offset and slope of the characteristic curves relative to exposures (figure 2, curves 2.1,2.2,2.3). On the basis of modeling data on the distribution of optical densities B of the layers of the masked negative fchg.2, curves 1. 1.1.1.2.1.3; and taking into account the position of the characteristic curves of the positive (Fig. 2, curves 2. 1,2. 2,2. 3), the functional converter of the processor 17 will eject the patterns of optical densities N In) of the future positive (Fig. 2, curves 3, 1.3. 2.3. 3), which are also displayed on the display screen through the switch 20.. Curves modeled in processor 17 show the distribution of optical color-separated densities of a positive photoprint prior to its actual production. The found values of the layer-by-layer masking and exposure coefficients are fixed in the memory of processor 17. In the print mode, the operator sets up positive material on the optical beam path, then the additional switch 12 is set by the processor 17 to install a print and a negative 4 color printing is performed. the parameters and mode of which are set by the processor 17. After the end of each printing cycle, the stepping motor 24 is turned on and the turret 25 is turned on, the next filter is installed. This is repeated three times to print three color images of a negative to one positive. To ensure synchronous and synphase operation of the device, additional switch 12, analog key 15, processor 17, scanner unit are connected to the clock generator 23. The proposed electronic-copier device allows element-by-color analysis of the color image, provides the ability to automatically equalize the process of printing color photographs on the basis of the simulation carried out in accordance with the objective criterion of the histogram of the effective (color separation) image densities, which allows Receive corrected color prints with specified gradation and color separation characteristics. The invention of the Electron Copier System, comprising a cathode ray tube, the inclination of the system associated with a scanner unit, an application glass behind the cathode ray tube for accommodating a negative that is optically coupled through an optical CHCTefvsy projection and an optical beam splitting system a screen for placing a positive photographic material; a video signal selection channel consisting of a photoelectric multiplier and a logarithmic converter connected via a sort switch Analyze-printing with feedback amplifier and analog key, amplitude selector with the first processor input, the first output of which is connected to the feedback amplifier, and the second to the first input of the switch, the output of which is connected to the display, and the second input with the first output of the input curve of the characteristic curve of a positive photographic material, the second output of which is connected to the second input of the processor, and the third input - to the first output of the clock generator, the second output of which is connected to an analog key, characterized in that In order to improve the accuracy of image correction in color-by-element printing with electronic masking, a three-channel color divider, two channels for extracting the optical density video signal, a matrix unit, an additional switch, a stepper motor, and a turret with folic optical filters, the outputs of each channel for selecting the optical signal for the optical density are connected to the device. to the corresponding inputs of the matrix unit, whose outputs through an additional switch in the n mode The print and controlled feedback amplifier is connected to an exponential converter, the output of which is connected to the control electrodes of the cathode-ray tube, and in the additional switch position in the analysis mode, the output of the matrix unit through the additional switch, analog switch, amplitude selector is connected to the first processor input, the first the output of which through a controlled feedback amplifier is connected to the input of the exponential converter, the second to the fourth input of an additional terminal The second output is connected to a stepping motor, on the shaft of which a turret with light filters is installed, is located between the negative and the optical projection system, and the fifth output of the additional switch is connected to the synchronous generator. Sources of information taken into account in the examination of 1, the nomenclature of scientific devices of the national enterprise of Carl Zeis Jenik for export. Supplement to the journal Jena Review, 1573, f 4. 2. Authors certificate of the USSR. No. 77.5712, cl. C, 03 B 27/73, 1979 (prototype). Fat LC Zl / tf : lir liM Phi1.1