SU841000A1 - Device for converting light beam displacement- to-code converter - Google Patents

Description

(54) DEVICE FOR TRANSFORMING A LIGHT BEAM INTO CODE

Claims (2)

MOVEMENTS of several light beams, It is impossible to use inertial light sources). The purpose of the invention is to expand the functionality of the device. The goal is achieved by the fact that in a known device for converting the movement of a light beam into a code containing an optical unit with a light source, a scanner, a voltage source, the first output to which is connected to one contact of the resistor layer of the scanner, and the second output to another contact of resistive scanner layer and the first output of the sweep generator, the output of the start signals of which is connected to the first control input of the pulse counter, the pulse generator, the recording unit, the switch and the differential are entered uyuschy unit, whose output is connected to the input of registriruyuscheg block counting input of pulse counter and the first input of the switch whose output is coupled to a second. the control input of the pulse counter, the output of the pulse generator is connected to the control input of the sweep generator, the second output of which is connected to the first input of the differentiating unit, and the output of the stop signals is connected to the second input of the switch, the collector of the scanner is connected to the second input of the differentiating unit. Fig. 1 shows a block diagram of a device for converting the movement of a light beam into a code; Fig. 2 shows voltage and current plots at control points depending on the current time t. The device contains an optical unit 1 with a light source, a scanistor 2, a voltage source 3, a pulse generator 4, a sweep generator 5, switch b, a pulse counter 7, a recording unit 8, a differentiating unit 9, test points 10 and 11 for controlling the shape of The outputs at the outputs of the pulse generator 4 and the sweep generator 5, respectively, Time T and TQ (Fig. 2) correspond to the ends of the leading and trailing edges of the sawtooth (triangular) voltage pulse of the sweep generator 5. When the voltage of the UK generator 5 sweep voltage generator voltage 4 pulses is zero (Fig.2a). The voltage of the generator 4 pulses at the test point 10 is shown in Fig. 26. When the voltage U shape of the generator 5 is swept at the test point 11, the voltage of the pulse generator 4 differs from zero (Fig. 2c). The current SFr passes through the differentiating unit 9 (Fig. .2d) the voltage at the output of the differentiating unit 9 is shown in fig.2d, the voltage on the recording unit 8 in fig.2e, the pulses of the starting and stop signals of the sweep generator 5 in fig.2z and g. The device works as follows. With the unmodulated light flux of the light source of the optical unit 1, an image of the light beam is formed on the photosensitive surface of the scanner 2 using an optical unit, the position and size of which can be any within the length of the scanner 2. At the output of the scanning generator 5, a modulated sweep pulse is generated (Fig. 2b) As a result of the modulated voltage pulse sweep, a modulated photo flows through the scanistor 2 with the voltage source 3 turned on in the circuit of the differentiating unit 9. OK 3F (Fig. 2d) “The points A and B of the curvature of the photocurrent (Fig. 2d) correspond to the position of the front and back border of the light beam on the surface of the scanner 2. When differentiating the photocurrent Cfd, a series of pulses of both polarities is selected for the selected form of modulation pulse voltage triangular in shape (Fig. 26), the amplitude of the pulses corresponding to the position of the illuminated part of the AB, differs from the amplitude of the pulses corresponding to the unlit areas. On the recording unit 8, the video signal is in analog form (Fig. 2e), which can be used to observe the shape, position, size and intensity of one or more light beams when adjusting the device and monitoring its operation. The sweep generator 5 at the time of formation of the transition from the front to the trailing edge of a single sweep of a sawtooth (triangular) shape (FGP.2a) and from the rear to the leading edge of a subsequent sweep pulse, selects voltage pulses (Figures 2g and 2h). The impulses at the output of the start signals of the sweep generator 5 are used to start the pulse counter 7. The pulse counter 7 is stopped by applying to the second control input a count stop pulse. In the case of measuring the size of the image of the light beam. On the photosensitive surface of the scanner 2 (the second input and output of the switch b are closed) the counting stop pulse (fig.2g) from the output of the stop signals of the sweep generator 5 is fed to the second control input of the pulse counter 7. In this case, the counting counter input ka 7 pulses is adjusted so that only pulses with an amplitude exceeding the AND level (fig.2d) of the pulse series from the output of differentiating unit 9 are recorded (the setting is made, for example, by an input attenuator of the pulse counter 7). Thus, after starting the pulse counter 7, it registers all the pulses of a level which is greater than the level AND (fig. 2d), i.e. the number of registered pulses during the duration of the sweep pulse is proportional to the image size of the light beam on the surface of the scanistor, 2. In the case of measuring the position of the image of the light beam on the surface of the scanner 2 (the first input is the output of the switch 16 are closed), the second control input of the pulse counter 7 is connected to the counting input and a series of pulses from the output of the differentiating unit 9 arrive (fig.2d). In this case, the counting input of the counter 7 pulses is adjusted so that all pulses with an amplitude of less damage nr -r (fig.2d) are recorded, and the second control input of the counter 7 pulses is adjusted so that only those pulses are perceived exceeds the level of Hj (fih. 2d). Thus, the counter of 7 pulses is produced by the first, (or one of the subsequent) pulses, the amplitude of which exceeds the level I. Since this pulse, depending on the position of the light beam on the surface of the scanner 2, can be located at any time interval from the beginning of the formation of the pulse the sweep, the number of pulses registered by the pulse counter 7 is proportional to the position of the image of the light beam on the scanner surface 2. Measurement of the size or position of several light beams can be carried out using a multi-input counter of 7 pulses. For example, to measure the position of two light beams (the first input and output of the switch b are closed) with the beginning of the formation of a sweep pulse, launch two meters, then when one and five pulses of the first series are selected at the input of the stop signals of the counter. corresponding to the position of the first coupling beam, the first counting stops, and when one of the pulses of the second series is allocated to the stop input of the counter, the second counting stops. , Measurement of the size of two light beams (the second input and output of switch 6 are closed). With the beginning of the formation of the sweep pulse, the first counter is started, which counts the number of pulses of the first series corresponding to the size of the first light beam, then the first counter stops after the arrival of counting pulses / stops and the second counter is started, which counts the number of pulses of the second series proportional to the size of the second light beam. The intensity of the light beam is determined either by the amplitude of the video pulse in block 8 or by means of a pulse counter 1 adjusted to measure the size of the light beam. In this case, the input attenuator of the pulse counter 7 is sequentially adjusted to the levels of the And- and I0 registration of the pulses. From the difference Is tlf, the intensity of the light beam is determined. Thus, the proposed device, in comparison with the known, allows expanding the functionality of the device for converting the movement of a light beam into a code. Claims of the invention A device for converting the movement of a light beam into a code containing an optical unit with a light source, a scan source, a voltage source, the first output of which is connected to one contact of the resistive layer of the scanistor, and the second output to the other contact of the resistive layer of the scanistor and the first output of the sweep generator, the output is old new signals which are connected to the first control input of the pulse counter, a pulse generator, which is because in order to expand the functionality of the device, a recording unit, a switch and a differentiation unit, the output of which is connected to the input of the registering unit, are entered into it the input of the pulse counter and the first input of the switch, the output of which is connected to the second control input of the pulse counter, the output of the pulse generator is connected to the control input of the sweep generator, second The output of which is connected to the first input of the differentiating unit, and the output of the stop signals connected to the second input of the switch, the collector header of the scanner is connected to the second input of the differentiating unit. Sources of information taken into account in the examination 1. The author's certificate of the USSR 464007, cl. G 08 C 9/06, 05.07,72.2. Author's certificate of the USSR S 494760, cl. G 08 C 9/06,27.05.74 (prototype),