SU543003A1 - Graphic reading device - Google Patents

Description

one

The invention relates to automation and computing, in particular, to devices for semi-automatic reading of graphic information.

Devices for reading graphical information are known. One of them contains an electronic tablet with electroacoustic transducers connected via amplifiers and logic elements And with a pulse generator, a counter, registers, a unit, connected to a coordinate remover, two ultrasonic generators, logic elements AND, OR II delay elements 1. Other device is known containing a tablet with electro-acoustic converters connected through the first and second amplifiers with the first and second logic elements And, respectively, a puller of coordinates connected via tr the amplifier to the norm block, the nmuls generator connected via the third logical element And with the counter, connected to the register and through the first delay element to the third logic element I and the trigger of the formation of the cmuls, the coupling unit connected with the switching trigger, and through the second element of the delay - with the trigger of forming the pulses n the second logical element OR, the trigger of the handicraft and the fourth logical

element and 2. However, both ethn devices are not reliable enough.

The aim of the invention is to develop a job. In the described device, this is achieved by the fact that it contains the first and second frequency dividers, the inputs of each of which are connected to the first and second logical elements AND, respectively, and the outputs are connected to a control trigger, but directly through the fourth logical element AND to the second logical element OR , with an I blocking unit with an nciinbiM logical element OR, this is the input; 1Y of the first and second logical ANDs are connected to the switching trigger on the second logical element OR. In addition, in the device, the electroacoustic transducers and the coordinator puller are electromagnetic, and the tablet is made of magnetostrick material

The drawing shows the scheme of the described device.

Oio contains electro-acoustic transducers (ultrasound emitters) 1, 2, coordinator puller (receiver of ultrasound) 3, 4 nz tablet of magnettostric material, amplifiers 5-7, logic gates And 8-11, switching trigger 12, trigger formed 13. pulses trigger uiravleii 14 , logical elements 11LI 15, 16, -1-1smeites

delays 17, 18, threshold unit 19, frequency dividers 20, 21, pulse generator 22, counter 23, register 24 and control unit 25.

Electroacoustic transducers 1, 2 of the electromagnetic type are a node consisting of an inductance coil made in the form of a linearly extended frame and a permanent magnet creating a bias field in the conversion zone (in the case of using a ferromagnet plate, the need for magnetization will disappear). Placed orthogonally on the two adjacent edges of the tablet, they allow the electrical pulse to be converted into an ultrasonic wave front moving in a fiber at a constant speed. The main elements of the 3-point remover are: inductance and a permanent magnet are also angry. The conversion of the ultrasonic signal into an electrical one in the 3-point remover is based on the use of the inverse effect of magnetostriccin. The material of the plate 4 must have a sufficiently high electro-mechanical conversion efficiency, high electrical resistivity, low temperature coefficient of ultrasound propagation velocity and low attenuation coefficient of ultrasonic vibrations.

The input of the amplifier 5 receives the emf, developed by the receiving converter of the puller 3.

Elements 8, 9 and switch trigger 12 are part of an electronic switch that allows the separation of the coordinates X and Y in time. Element And 10 performs time-pulse transformation, and element 11 has its usual logic function. The trigger for the formation of pulses 13 forms the pulse with a duration of up to times greater than the time it takes for ultrasound to grow and the measured coordinate. A control trigger 14 at the time of the end of the measurement cycle of the coordinates X and K closes the AND 11 logic element and the self-oscillating process in the link an electroacoustic converter — the puller stops. Logic elements ILR 15, 16 perform a logical function. The delay elements 17, 18 perform the function of matching processes over time. The threshold unit 19 eliminates the false alarms of the device from small amyl signals. Frequency dividers 20, 21 have one; The new division factor and allows to increase the time interval measured by a factor of k. The generator 22 continuously emits clock pulses to measure time intervals. The counter 23 alternately registers the coordinates X and Y; The register 24 serves for short-term storage of coordinate codes and their transfer to external devices, and the control unit 25 coordinates the operation of the entire reader as a whole. At the edges of the Plan 4, in order to reduce the levels of spurious detached signals from the side edges of the sound conductor, there are absorbers (not shown).

At the beginning of the measuring cycle, the control unit 25 outputs to the counting input

trigger 12 and the input element of the delay 17 pulse. Pulsed by element 17, the pulse goes to the zero inputs of the flip-flops 13, 14 and through the element ILP 16 - to the inputs of the elements And 8, 9. The self-oscillatory begins

the process in the link electroacoustic transducer I is a coordinate pickup 3, as a result of which a series of imiuls is fed into frequency divider 21. With the i-ray of the k-th pulse, the self-oscillatory process is terminated.

counter 23 records the number of fillings imulses in the form of an X coordinate code, which is transmitted to register 24, and counter 23 is cleared. At the next time point, unit 25 generates a second pulse to the counting input of trigger 12, which initiates a self-oscillating process in a link electroacoustic transducer 2 - puller 3. At the same time, a new series of pulses, a second pulse, which terminates the self-oscillatory process, enters the frequency divider. The counter 23 records the number of filling pulses in the form of the Y coordinate code.

The introduction of new elements and new constructive links allows increasing the reliability of the device operation by 30–40% compared with the known ones.

Claims (2)

1. A device for reading graphic information containing a tablet with electroacoustic transducers connected via the first n second amplifiers to the first and second logical elements P, respectively, pick up a coordinate box, connected via a third amplifier to the threshold unit, a pulse generator connected via a third logical element P with a counter connected to the register and through the first the delay element is connected to the third logical element H and the trigger of the formed pulses, the control unit connected to the trngger by the switching unit, to the first logical element of the RShI and through the second delay element to the trigger of the formation of pulses and the second logical element OR, 51 the control and the fourth logic element AND, characterized by the fact that, in order to improve the reliability of the device, it contains the first The second frequencies are connected, the inputs of each of which are connected to the first and second logical elements AND, respectively, and the outputs are connected to a control trigger connected directly and through the fourth logical element AND to the second logical element ILR1, to the control unit and to the first logical element OR, while the inputs of the first and second logic elements And connected to the trigger switching and to the second logical element or. 2. The device according to claim 1, characterized by the fact that the electroacoustic transducers and the coordinator puller are electrically operated, and the electronic tablet is made of a magnetostrictive material. Sources of information, nringgye into account prn exertize: 1. US patent number 3692936, class. 178-18, 1972. 2. US Patent To 3664722, cl. 350-3.5, 1972.