SU361465A1 - DEVICE FOR ENTERING GRAPHIC INFORMATION - Google Patents

Description

The invention relates to computing.

Graphic input devices are known that contain an optically coupled radiation source, a condenser, a diaphragm and a scanning unit, switches, gates, generators, counters, amplifiers, a trigger, a driver, and delay lines.

In the proposed device, in order to increase the resolution and accuracy of coordinate conversion, the output of the scanning unit is connected to an amplifier connected to one of the inputs of the auxiliary generator, with a counter through one gate and to the input of the time block, the output of which is through the driver and the other gate - with one of the trigger inputs and with the other input of the auxiliary generator connected to the counter; The master oscillator is connected to another trigger input connected to a pack: equal to 1 key inputs, with output keys and through one of the delay lines with a counter, and through another with a scanning unit containing a fiber-optic converter, the input fibers of which are located in the form rulers, and the output is in the form of a figure corresponding to the apparatus of the dissector, and are associated with the photocathode, and the deflecting coils

dissector connected to the sweep generator. FIG. 1 shows a block diagram of a device for displaying graphic information; in fig. 2 - time diagram of the device.

The device consists of three main parts: an optical system for forming a narrow parallel beam of rays, a scanning device and electronic units for processing information signals.

The optical unit includes a light source 1, a condenser 2, and a slit aperture 3. Scanning unit 4 contains a dissector 5, a fiber-optic converter (GPM) 6, a master pulse generator 7, a sweep voltage generator 8 and a deflection generator 9.

The electronic circuit for processing the signals taken from the output of the dissector consists of a pulse shaping amplifier 10, a counter and, control trigger 2, keys 13 and

14, auxiliary pulse generator

15, time delay circuits 16, pulse generator 17, code transfer keys 18, and delay lines 19 and 20.

The fiber-optic converter 6 serves to quantize the coordinate of the graph, transmitting and converting the image of the ordinates into a form corresponding to the type of scanning of the dissector. At its input, the optical fibers are laid close to each other and make up a straight linear row — ruler 21. The number of optical fibers in the ruler is equal to the number of quantization steps of the maximum ordinate. The output of the GPA forms a configuration corresponding to the type of sweep of the dissector. FIG. 1 this output has a linear shape. The fibers here can be arranged around the ring and the sequence of differences from that at the entrance. When saving its number of discrete elements (number of fibers), the quantization step at the output of the SPM can be increased or decreased in relation to the sweep shape and the size of the photocathode of the dissector. The VON output is optically coupled to the dissector photocathode.

The anode of the dissector is connected to the input of the amplifier-maker 10. To eliminate interference, this block limits the signal to a minimum. The output of the amplifier-former is connected to the time delay circuit 16, to the start input of the auxiliary generator 15, made according to the scheme with delayed feedback, and through the key 13 to the output of the counter //. The output is given, its generator 7 is connected to the pulse inputs of keys 18, through the delay line 20 to the zero inputs of the trigger trigger //, to the start inputs of the control trigger / 2 and via the delay line 19 to the input of the sweep generator 8. The output of the time delay 16 through the pulse shaper 17 is connected to the pulse input key. The output of the latter is connected to the starting input of the generator 15 and to the stanz the input of the control trigger 12. The output of the trigger 12 is connected to the potential inputs of the keys 13 and 14.

Before starting to read, a transparent medium, such as a film, with the function recorded in the form of an opaque curve, is placed between the SPD line and the slit diaphragm. The luminous flux, the passage through the transparent field of the carrier, falls on the ends of the optical fibers of the ruler 21, except for those that are currently closed by the line of the graph. The light of the individual fibers of the GPA enters the photocathode of the dissector. Here an electronic image is formed in the form of a number of points, which is fixed and under the influence of the accelerating field is transferred to the plane of the diaphragm 22. The latter has a narrow slit 23. As a result of the sweep (deviation) of the electromagnetic field, electrons from each element of the image alternately pass . After that, the electrons fall into the second part of the dissector - the electron multiplier. From here, the signals arrive at block 10, where pulses are formed from them.

The frequency of quantization, i.e., the polling frequency of the function, is set by the generator 7. This generator can be synchronized by traversing pulses of a digital computer or magnetic

drive, which is pre-recorded code information.

Each pulse of the generator 7 is fed to the keys 18 for transmitting the code, to the zero inputs of the counter triggers to reset it to the zero position, to the start input of the control trigger via the delay line 19, to the input of the sweep generator - in this case the sawtooth voltage generator. As a result of the tilting of the trigger 12, the keys 13 and 14 are opened.

In the process of scanning, the pulses from the amplifier-maker are received: through the open key 13 to the counter input and directly to the input of the time delay circuit 16 and the stop input of the generator 14. The exposure time of the circuit 16 is selected slightly longer than the duration of the pulse generator pulse 10 period. circuit 16 for a given exposure time. At the same time, its switching is prevented if LT and the duration of the period of the input pulses do not exceed the holding time. Thus, the pulses from the output of block 10 are fed to the input of the counter // until there is a space in this pulse sequence corresponding to a shaded section of the plot of the line 21. Then the circuit 16 is triggered and the block 17 generates a pulse by the voltage drop which, through the public key 14, starts the auxiliary generator 15 and switches the control trigger 12. As a result, the keys 13 and 14 turn out to be closed, and from the generator 15 output to the counter input // pulses with a follow-up period begin to flow twice Witzlaus pulse repetition period shaper W. Number auxiliary oscillator pulses received by the counter 11 depends on the thickness and slope of the line graph, m. e. the number of darkened line ends of the optical fibers 21. For example, in FIG. 2, the first space corresponds to the dimming of four light guides. Therefore, to take into account the ordinate of the line thickness, it is necessary to send an additional two impulses to the counter. The first pulse, which appears at the output of the imaging unit 10 after the space, stops the generator 15 and cocks the time delay circuit 16. These pulses do not go through the counter, since the key 13 is closed. After the end of the sweep, the circuit 16 switches, but the pulse generated to start the auxiliary generator 15 does not pass, as the key 14 also turns out to be closed. Thus, during a single sweep, a number equal to the number of lit fibers of the ruler located between the reference ruler and the graph, plus half the value of the darkened fibers, is recorded in the counter. The next impulse of the master oscillator transmits the code from the counter // to the machine or magnetic drive, and then the next ordinate is read. By supplying the master oscillator with switches, you can change the frequency of the quantized function. The device is described with reference to a linear scan of the dissector. The n-transducer can be made with a dissector with a different type of sweep, for example, spiral, circular, raster. In this case, the output of the GPM should be performed according to the type of sweep. The device allows processing of media of different widths. This requires interchangeable Hopes. Accuracy of reading ordinates is determined by e-, with abilities of GPs and photocathodes of the dissector. The resolution of the GPA is the minimum diameter of the optical fibers from which its ruler is made. The polling frequency of the function-i, i.e., the time-quantization rate, in the device is determined by the raververt generator. Its maximum value depends on the speed of the counter. If the latter is performed on high-frequency transistors, it is easy to obtain a pulse counting rate of 10 MHz. With a total number of quantization levels of the ordinate equal to 1000, which corresponds to the accuracy of reproduction of the ordinate at about 0.1%, the frequency of polling the function will be at least kHz. Object of the Invention A device for inputting graphical information comprising an optically coupled radiation source, a condenser, a diagram and a scanning unit, keys, generators, a counter, an amplifier, a trigger, a driver, delay lines, characterized in that, in order to increase its resolution and accuracy coordinate conversion, the output of the scanning unit is connected to an amplifier connected to one of the inputs of the auxiliary generator, with a counter through one gate and to the input of the time delay block whose output is black The driver and the other valve are connected to one of the trigger inputs and to the other input of the auxiliary generator connected to the meter, the master generator is connected to the other input of the trigger connected to the control inputs of the keys, to the output switches, and through one of the delay lines to the counter, and through another with a scanning unit containing a fiber-optic converter, the input fibers of which are arranged as a ruler, and the output fibers as a figure corresponding to the aperture of the dissector and optically connected to the photo and the diverting coils of the dissector are connected to a sweep generator.

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