SU1024946A1 - Photoelectric reading device - Google Patents

Abstract

Photovoltaic SCHIOSHAYU4 Yo device comprising first and second photoelectric converters soedinennze with a source of mixing and the oscillator signal demand soedinonnmi sequentially, the second photoelectric transducer is optically coupled through the main kollimatorS light source, the first and second formers reading signals whose inputs are connected to outputs of the respective Photoelectric converters: first, second, third, fourth, and fifth builders, rows are connected to the output of the generator setnala survey and the first inputs of the first and second flip-flops and Vyg passages connected respectively to per-; the first inputs of the first and second elements of the first and second elements of the comparison, the second inputs of the first and second elements of And are connected respectively to the outputs of the first and second signal conditioners read signals, the second trigger are connected respectively to the outputs of the first and third elements And, and the outputs — with the second inputs of the first and second comparison elements, respectively, the first and second transverse displacement actuators, connected through amplifiers, respectively, to outputs of the first and second elements cfra-. The output of the second element AND is the first output of the device, characterized in that, (L with the aim of increasing the reliability of the device, it contains doyolnaya collimator, the fourth AND element and the actual gate strobe, the output of which is connected to the first input of the fourth And element, and the output is connected to the output of the polling signal generator, the output of the first read signal detector is connected to the second inputs of the third and fourth And elements, the output of the fourth D of the true element And is the second output of the device oystva first I Property electrical converter optically coupled, via the main and additional Tel'nykh collimators with a source; light.

Description

The invention is related to automation and computing, and can be used to compose information from media with a higher density of eapi, si. A device for automatically reading graphic information recorded on diagrams and photo paper ribbons is known, which contains a vidicon-based optical-electronic converter, a source of tape pulling mechanism and a fl. Electronic circuit. The disadvantages of this device are the use of a vidicon in a single line mode, since the scanning of the information on the abscissa axis is carried out by mechanical dragging of the carrier tape relative to the vidicon, the significant nonlinearity of the acoustic characteristics of the target and the geometric distortions on the edges of the latter. It is also known a photoelectric reading device containing first and second photoelectric converters connected to a bias source and a polling signal generator connected in series, a second photoelectric converter optically connected: 1: 1 through the main collimator with a light source, the first and second read signal shapers, whose inputs The first, second, third, fourth, and fifth gate drivers are connected to the outputs of the corresponding photoelectric converters. signals whose inputs are connected to the output of the interrogation signal generator and to the first inputs of the first and second flip-flops and the outputs, respectively, with the first 19 inputs of the first, second and third elements And and the first inputs of the first and second elements of the comparison, are connected respectively to the outputs of the first and second read signal formers, the second inputs of the flip-flops are connected respectively to the outputs of the first and third I elements, and the outputs to the second inputs of the first and second elements comrade comparing respectively the first and second actuators transverse displacement of the carrier coupled via amplifiers, respectively, to the outputs of the first and second comparing elements, the output of the second AND gate is the output of the lane vym 2. The purpose of the invention - an increase ngschezhnosti device. This goal is achieved by the fact that an additional collimator, the fourth And element and the sixth gating pulse shaper are entered into the device, the KOTO-i Iporo output is connected to the first input of the even: true And element, and the output is connected. Yen with the output of the interrogation generator, the output of the first read signal generator is connected to the inputs of the third and fourth And elements, the output of the fourth And element is the second output of the device, the first photoelectric converter is optically connected to the light source through the primary and secondary data sources. Figure 1 shows the functional diagram of the device; figure 2 - timing charts, to explain the operation of the device. The device contains a radiation source 1, a primary collimator 2 / auxiliary collimator 3, first and second photoelectric converters 4 and 5, a survey signal generator b and a bias voltage source 7 for photoelectric converters, a first video extraction unit 8, a second block 9, a video extraction signal, the first. The second, third, fourth, fifth shaper 10-14 gate signals, the first, second and third elements And 15-17, the first and second triggers 19 and 20, the first and second elements 21 and 22 of the comparison, the mechanisms 23 and 24 of the transverse displacement of the carrier , amplifiers 25 and 26, the carrier 27 of information, the fourth element And 28 and the sixth driver 29 of the strobe signals. Figure 2 presents time diagrams at various points in the diagram. The radiation source 1 through the primary and secondary collimators 2 and 3 is connected to the first photoelectric converter 4 and through the Main collimator 2nd to the second photoelectric converter 5. Scanors are used as photoelectric converters. The line-by-line reading of information from scanstors is performed by applying a constant voltage from the bias voltage source and scanning saw-tooth interrogating voltage from the interrogation signal generator. Scanners 4 and 5 are connected to blocks 8 and 9 of the extraction of de-signals. The device works as follows. The flow of light from source 1 is projected onto screen magnifiers 4 and 5 so that with the help of collimators 2 and 3 on scanner 4 a light relief is formed from two spaced points of the ribbon edge in the form of sharp edges of light and shadow. The size of the formed light zones on the scanner is determined by the value of the maximum possible transverse movements of the carrier 27; and the distance between the spaced points of the carrier 27 is the allowable distortion of the information carrier 27. A constant-voltage bias source 7 is connected between parallel-connected emitters of scanstors. To one of the terminals of the voltage source 7 a generator .6 of a saw-tooth interrogation is connected. The outputs of the scanstors are connected to the inputs of blocks 8 and 9 of the selection. Video signals j In a survey of scanning of scanstors with a linearly increasing voltage (FIG. 2a from the survey generator 7, current surges appear on the outputs of the scanstors, FIG. 26), corresponding in time to the distribution of light relief on the scanstors, In block 8 of the video signal allocation, these jumps are differentiated (FIG. 2B) and converted into formational pulses (FIG. 2d), at which time the intervals t ,, (FIG. 2d) from the beginning of the sawtooth voltage to the occurrence of information impulse are proportional to the distance (fig, 2e) of the light zones on the scanstors from the ends of the scanstors. To separate the information impulses and pulses, which characterize the transverse displacement of the carrier tape, and also to eliminate the parasitic impulses arising from differentiation at the singular points of the saw The device contains AND 15-17 and 28 elements. A video signal from the corresponding scanner (fig 2g) and an enable pulse (fig 2d, K, n) from blocks of cutting gates is sent to one input of the elements AND. At the outputs of the elements 15 and 17, pulses are formed (fig. 2e, l), characterizing the transverse displacements of the tape a on the very elements. And 16 and 28 g are information pulses (fig 2p) corresponding to the graphic infogmation. During the initial adjustment of the device, the blocks of the reference gates are adjusted so that the pulse durations (FIG. 2 n) at their output are equal to the pulse durations (FIG. 2k, m and symmetric triggers, one input of which receives pulses corresponding to the beginning of the sawtooth). interrogation, and the other input of the trigger receives I pulses (figs, 2e, l), in which the time interval from the beginning of the sawtooth voltage until the occurrence of these pulses is proportional to the distances of the light zone formed on canistor optical systems from two dispersed points of carrier edge 27. Equal amplitude pulses from symmetric triggers (fig |) 2g, and) and pulses from formers (figs, 2h, n) in antiphase arrive at the input of comparison elements Since during the initial alignment they are duration of the match is taken equal, then a zero signal is generated at the outputs of the comparison elements (FIG. 2l, s). In the case of a random transverse tape, pulses appear in the process of reading at the inputs of the comparison element (Fig.2l, c - dashed line), the polarity of which corresponds to the direction of movement of the tape and the duration to the value of these displacements. The pulses (figs, 2a, o) from the elements, comparisons through amplifiers 25 and 26, the actuators 23 and 24 control the forces in space of the driver 27 so as to work out any transverse displacements and distortions that can occur in the reading process; As an actuator, for example, an actuating motor can be used with the conversion of the motor vrastilnogo movement into translational transverse movement of the tape and tape drive mechanism; The technical and economic effect from the use of the proposed invention is to increase the reliability of the device and dc read accuracy when reading graphic information {increased density by more precise installation of the carrier relative to the photodetectors.

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Claims (1)

PHOTOELECTRIC RECEIVER - * ANOTHER DEVICE containing the first and second photoelectric converters connected to the bias source and the demand signal generator connected in series, the second photoelectric converter optically connected through the main collimator's light source, the first and second read signal shapers, the inputs of which are connected with the outputs of the respective photovoltaic converters "the first, second, third, fourth and fifth gate drivers, inputs to of which are connected to the output of the polling signal generator and to the first inputs of the first and second triggers, and the outputs are connected, respectively, to the first inputs of the first, second, and third I elements and to the first inputs of the first and second comparison elements, the second inputs of the first and second I elements with the outputs of the first and second drivers of read signals, the second inputs of the triggers are connected respectively with the outputs of the first and third elements And, and the outputs with the second inputs of the first and second elements are compared respectively, the first and second actuators of lateral displacement of the carrier, connected through amplifiers respectively to the outputs of the first and second elements of comparison, the output of the second element And is the first output of the device, characterized in that, in order to increase the reliability of the device, it contains additional collimator, the fourth element And and the Sixth gate pulse generator, the output of which is connected to the first input of the fourth element And, and the output is connected to the output of the polling signal generator, you the course of the first driver of read signals is connected to the second inputs of the third and fourth elements And, the output of the fourth element And is the second output of the device, the first photoelectric converter is optically connected through the main and additional collimators to a light source. .