SU862153A1 - Device for reading graphic data - Google Patents

Description

(54) DEVICE FOR READING GRAPHIC INFORMATION

The invention relates to the field of automatics and computer engineering. And can be used for the on-line transformation and input into computers of various forms of graphic information. A device for reading graphic information is known comprising a tablet, whose coordinate buses are connected to commutators, a control unit connected to a pulse generator, a coordinate remover and a coordinate recording unit. The closest in technical essence to the invention is a device containing a tablet with a coordinate busbar matrix, bus switches, a control unit connected to an analog-digital converter (LED) and a finger remover, with position sensors Ji. However, such devices are complex. The purpose of the invention is to simplify the device. The goal is achieved by the fact that in the device, "containing a tablet made in the form of a system of two mutually orthogonal coordinate buses connected to the corresponding switches, a pulse distributor, whose inputs are connected to a pulse generator and the first counter, and the outputs are connected to switches and blocks a memory connected to the coordinate remover and the first OR element, and a second counter connected in series, a DAC and a comparator, the other input of which is connected to the first OR element, and the output is connected The first counter is connected to the first counter, reversible counters are entered, the inputs of which are connected to the outputs of the pulse distributor, and the outputs are connected to the outputs of the device, and the second OR element connected to the pulse distributor and the second counter. The coordinate remover is made in the form of two identical inductors, the axes of which are parallel to each other and perpendicular to the plane of the tablet, and the distance between. Then, the coordinate pickup and projection of the center of the inductance closest to the pickup point is equal to the distance between the axes of both coils, while the projections of the centers of both coils onto the plate plane are aligned with the coordinate pickup point. The drawing is a block diagram of the device.

It contains a tablet 1 with coordinate tires, switches 2, 3, reversible counters 4, 5, puller 6

coordinates with inductors 7, 8, the first counter 9, the memory blocks 10, 11, the first element OR 12, the comparator 13, the DAC 14, the second counter 15, the pulse generator 16j, the pulse distributor 17 and the second element OR 18.

The device works in the following way.

At the initial moment of time, all device counters are set to. zero state

Having set the puller 6 coordinates to the read point, the operator of the Start button button (not shown in the drawing) turns on the device, and starts the generator of 16 pulses.

The pulses from the output of the generator 16 enter the distributor 17 and, through switch 2 (buses X), sequentially poll the tires of tablet 1. At the same time, the pulses of the other output of the distributor 17 enter counters 4, 5, where the code corresponding to twice the coordinates of the polled tires is generated. The highest potential of the distributor 17 allows the flow of pulses induced in the first coil 7, in block 10.

When polling a tire located in the working zone of the first coil 7, the amplitude of the pulse induced in it will exceed a predetermined threshold level, and the signal from the output of the comparator 13 will transfer the counter 9 to a new state. In this case, in one of the reversible counters, for example, the 4J counter, a code is formed that corresponds to twice the X value of the selected tire, and in the next stage, the pulses from the output of the distributor 17 will form a code corresponding to the updated X value of the first coil 7 to the 15 counter. acting in the counter 4 will form in it the code / corresponding to twice the exact value of the X coordinate of the coil 7.

Upon completion of the formation of this coordinate, the signal from the output of the comparator 13 will transfer the counter 9 to a new state. In this case, counter 4 will record twice the exact value of the X coordinate of the coil 7 and the device will proceed to the following operation — determine the code of the X coordinate of the second coil 8 with simultaneous subtraction of this code in the counter 4 from the code stored there. This step is carried out similarly to the previous one.

after it has finished, it has eaten the coordinates of the% second coil 8 in the counter 4, the coordinate X of the read point is fixed.

The subtraction of the coordinate Y is carried out similarly;

Angshog signals from the puller output of the 6 coordinates are memorized in block. kah 10, 11 and through the element OR 12 arrive at the comparator 13.

The DAC 14 generates a stepwise voltage across the counter code 15 / supplied to the comparator 13, which, when the signals at both inputs are equal, forms the output signal.

The introduction of the reversible counters and the OR element. Also, the new constructive implementation of the 4 coordinates coordinates has made it possible to simplify the device 5 in an extraordinary way.

Claims (2)

1. A device for reading the grafic information containing planets, implemented in the entire system of two orthogonal coordinate axes connected to the corresponding switches, a pulse distributor, the inputs of which are connected to the pulse generator and the first counter, and the outputs are connected to co-switches and to the memory blocks connected to the coordinate remover and to the first element OR, and a second counter, a digital-to-analog converter and a comparator connected in series, the other input of which is connected to the first element This is OR, and the output is connected to the first counter, characterized in that, in order to simplify the device, it contains reversible counters, the inputs of which are connected to the outputs of the pulse distributor, and the outputs are connected to the outputs of the device, and a second OR element connected to the pulse distributor and to the second counter. 2. A device according to Claim 1, characterized in that the coordinate remover is made in the form of two identical inductors, whose axes are parallel to each other and perpendicular to the plane of the tablet, and the distance between the point of removal of coordinates and the projection of the center of the inductance closest to the distance between the axes of both coils, while the projections of the centers of both coils onto the plane of the tablet are located on the same straight line as the point of removal of coordinates. Sources of information taken into account in the examination 1. Author's certificate of the USSR 467377, cl. G 06 K 11/00, 1973. 2. US patent 3992579, cl. 178-18, published. 1976 (about O / toyp). I 1 I Mi i f