SU963013A1 - Device for forming scanning spot at reading-out graphic information - Google Patents

Description

54) DEVICE FOR FORMING SCANNING SPOTS AT READING GRAPHIC INFORMATION

The invention relates to automation and computing and can be used in automatic systems. tization of design work for entering information into computers for transferring it to display devices.

There are known devices for generating a scanning spot when reading a graphic information information containing a cathode tube and a set of electronic units designed to implement a given scanning algorithm D The closest to the technical essence of the invention is a device for generating a scanning pen when reading graphical information that contains electron beam tube, pulse shaper, first and second counters connected respectively to the control input and inputs / vertical and horizontal sweeps of the cathode-ray tube, the first and second switches connected to the inputs of the first and second counters, respectively, the element And, the pulse generator and the first trigger connected to the inputs of the element And, the third

; And the fourth counters, the second trigger, the third trigger, the output of which is connected to the first inputs of the first and second KONOviyTaTopOB, the selector, the output of which is connected to the counting input of the third trigger and the input of the older bit of the third counter, the first element OR, connected to the first input of the first trigger, the second element OR, connected to the input of the higher bit of the fourth counter, the delay element and the decoder C 2.

The disadvantage of the known device is the limited functional possibilities due to the nonoptimality of the scan law of the read image.

The purpose of the invention is to expand the functionality of the device by optimizing the scanning parameters.

This goal is achieved by the fact that a third switch is added to the known device for forming a 25-point scanner when reading graphic information, the inputs of which are connected to the outputs of the And and second igger element, and the outputs to the second inputs of the first and second switches and the comparison circuit, the inputs of which are connected to the outputs of the third and fourth counters, and the output to the counting input of the second trigger, the input of the selector and the first input of the second OR element, the inputs of the decoder are connected to the outputs The first and second counters, and the output to the first input of the first element OR, the output of the delay element is connected to the second input of the first trigger, and the output of the AND element is connected to the input of the lower bit of the fourth counter. The drawing shows a block diagram of a device for generating a scanning spot when reading graphic information. A device for generating a scanning finger when reading graphic information includes a pulse generator 1, a delay element 2, the first element or 3, the first trigger 4, the second element. OR 5, elements B, third switch 7, second trigger 8, third counter 9, fourth counter Yu, first switch 11, second clapper 12, third trigger 13, comparison block 14, first counter 15, second counter 1.6 selector 17 decoder 18 , electron beam tube 19 and form. tel. 20.,: The device works as follows. The enable signal supplied to the first input of the device sets the triggers 8 and 13 to the state O and, through the element OR 5, resets the counter 10 to O. The same signal records 1 in the higher bits of counters 15 and 16 and in the lower bit of counter 9. Since flip-flop 4 is about the initial moment in the state O, then at the output of the imager 20, connected to the cathode ray tube 19, beam quench signal present. The contents of the counters 15 and 16 enters the cathode ray tube 19 at the inputs. beam deviations in the corresponding coordinates, which work out the deviation currents equal in magnitude, where j, t ,, is the maximum value of the current Deviation corresponding to the full filling of the counters 15 and 16 As a result, the transmitted beam is moved to the center of the screen. The turn-on signal, the delay element 2 passes, sets the trigger 4 to state 1. As a result, the imaging unit 20 stops beam attenuation, and the beam is illuminated. I The delay on element 2 is necessary so that the beam has time to get into the specified counters .15 and 16 before it turns on. As a result of changing the trigger 4 on element 6, resolution is received, and pulses from the output of generator 1 pass through element 6. The first clock pulse is written to counter 10, and since trigger 8 is in state O, it passes through the switch 7 and enters the switch 11. The trigger 13 is also in the state O, so the pulse travels to the + input of the counter 15. As a result, the contents of the counter 15 are incremented by one and the beam moves along the X coordinate. As in counters 9 and 10, the 1, then at the output of the unit 14po is The drive that passes through the element OR 5 and resets the counter 10 into O. The same signal, arriving at the counting input of the trigger 8, sets it to the state 1. As a result, the switch 7 switches to the input of the switch 12. The second clock pulse passes through switches 7 and 12 to the + input of counter 16. It is also recorded in counter 10. In the result, the beam moves along the Y coordinate, and at the output of block 1.4 a second signal appears, which sends the trigger 8 again to the state O, and through the element OR 5 Resets the counter 10. Pulse from the output of the block 14 post It goes to the selector 17, which of the two incoming signals provides the second signal, which, on the counting input of the trigger 13, sets it to state 1 and switches on the switches 11 and 12 to the inputs of the counters 15 and 16. The output signal of the selector 17 enters counter 9 and increases its content by one. As a result of this, two successive clock pulses from the output / element And. 6 pass through the commutator 7 and 11 to the input of the counter 15. Consequently, the beam moves again along the X coordinate. The same two pulses are recorded into the counter 10, to the output in block 14, a new signal appears, which resets counter 10 to O and, having received the counting input of trigger 8, sets it to state 1, switching the switch 12 itself. The next two pulses now go to the input of counter 16, as well as counter 10. As a result, the beam moves along the coordinate W. Nova This output signal from block 14 changes the state of the trigger. 8 to the opposite, and the signal from the output of the selector 17 - the state of the trigger 13. Besides the toga, the signal from the output of the selector 17 increases the contents of counter 9 by one. Thus, the incremental content of counter 9 determines the sweep length. The trigger state 8 determines the sweep coordinate and, if the trigger 8 finds in the state O, then the sweep will detour according to the X coordinate, and if in the state 1, then the coordinate W. The state of the flip-flop 13 determines the sweep direction. The process of scanning and scheduling continues until the second input of the device, a signal that passes through the element OR 3 and sets the trigger 4 to the state O ,, thus closing the element And 6 for the passage of clock pulses. If there is no signal at the second INPUT: there is no device, then the scanning process is automatically terminated upon completion of reading the entire dsadr.

Claims (2)

1.Patent of France No. 2301881, cl. G About K 11/00, published 1973. 2. USSR author's certificate for application 2883038 / 18-24, 55 cl. G About K 11/00, 1980 (prototype).