SU1312622A1 - Device for reading graphic information - Google Patents

Abstract

The invention relates to automation, in particular to semi-automatic devices for reading graphic information. The purpose of the invention is to improve the accuracy of the device. The goal is achieved by ensuring the invariance of the coordinates of the points of graphic information to the angles of rotation and inclination, as well as the force of pressing the remover of coordinates to the surface of the tablet. 2 hp f-ly, 1 ill. (L with

Description

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The invention relates to automation, in particular to devices for reading graphic information.

The purpose of the invention is to improve the accuracy of the device.

The drawing shows the block diagram of the device.

The device contains a tablet 1 with piezoceramic emitters 2 and 3, a 4-coordinate puller, made in the form of a piezo-ceramic truncated cone, on the basis of which are applied signal electrodes, a generator of 5 clock pulses, a frequency divider 6, a driver of strobe pulses 7, made in the form of series-connected current transducer into voltage 8 and trigger 9, elements 10 and 11, drivers 12 and 13 coordinates, each of which contains trigger 14, element 15, counter 16 and register 17, 18 and 19 drivers and driver 20 and synchronizing pulses having generators 21 and 22 are short pulses, the elements 23 and 24 delay element. OR 25 and 26 and amps 27 and 28,

The drawing also shows the outputs 29 and 30 of the device.

Ustrp1 1stpo works as follows.

On the front side of the pulse from the output of the frequency divider 6, the generator 21 generates a short pulse that triggers the one-shot 18 and arrives at the input of the element OR 25 directly through iiij i through the delay element 23.

The piezoceramic emitter 2 is excited by an electrical power supply and creates a flat, 3-dimensional flat oscillating pin, in the form of a damped sinusoid, and extending in the direction of the X axis. The duration of the pulses at the output of one OE of the Ibrators 18 and 19 is chosen to be longer or equal to the front of the longitudinal acoustic wave travels from the corresponding radiator to the opposite edge of the acoustic duct.

The leading edge of the pulse at the output of the one-shot 18 is set to 1 trigger 14 of the driver 12, it is set to O, the counter 16 of the driver 13, the pulse 11 of the element 11 opens. The pulse pulses of the generator-generator 5 pass through from 22

An element 15, covered at that time, is counted by a counter 16. As only the elastic wave front reaches the converted graphical information point, a receiver is installed on the KOTopyio, a part of the acoustic oscillation energy is refracted into the receiver and at the output of the latter, and then at the output of the current transducer into voltage 8

an electrical signal is generated in the form of a damped sinusoid. For the first positive half-period (the largest in amplitude) of this signal, a Schmitt trigger 9 is formed

the gate pulse, which, having passed through the element I 1 1 opened at that time, enters the reset input of trigger 14 and sets it to O, as well as to register register 17 bus and rewrites the last digital code from counter 16. Thus the code corresponding to the X coordinate of the point to be converted appears in the reg ister 17.

Upon completion of all oscillatory processes occurring in the sound conduit after, value the radiator in the X coordinate, in the trailing edge of the pulse from the output of the divider 6 frequency

The pulse is generated by a short pulse generator 22. The one-shot 19 is started. Emitter 3 is excited according to a different coordinate, and again in the sound duct the student learns the volume flat acoustical

oscillation in the form of a damped sinusoid.

The leading edge of the pulse from the output of the one-shot 19 is set to 1 trigger 14 of the driver 13, set to O the counter 16 of the driver 12. TaKToiibie pulses passed through the element 15 open at this time, counted by counter 16. When the elastic wave reaches the {jpoHTOM elastic wave of the point being converted, the same a strobe pulse is formed in the driver 7, which, having passed through the element 10 open at that time, is fed to the input

reset the trigger 14 and set it to O, register register 1 7 bus and rewrites the last digital code corresponding to the coordinate of the converted point from counter 16.

With a strong destabilizing factor, the amplitude of the first positive signal half-cycle falls below the Schmitt trigger threshold, the pulse does not form, the measurement does not occur and thereby eliminates the error caused by non-interference.

Claims (3)

1. A device for reading graphic information containing a tablet with piezoceramic emitters of acoustic oscillations, a coordinate puller, the outputs of which are connected to the signal inputs of the strobe pulse shaper, a clock generator, the output of which is connected to the input of a frequency divider and synchronizing inputs of the coordinate formers, the outputs of which are the outputs of the device, that is, so that in order to increase the accuracy of the device, it contains a synchronization pulse generator, the input which is connected to the output of the frequency divider, and the outputs of the first group are connected to the control inputs of the corresponding piezoceramic emitters of acoustic oscillations, one-vibrators, the inputs of which are connected to the corresponding outputs of the second group of the synchronizer pulse sync, and the outputs connected to the first and second controllers and the approaches of the corresponding coordinates, and the element, one input1.1 of which is connected to the output of the strobe pulse former, the others are connected to the outputs corresponding to 1x single-vibrators, and the outputs are connected to the polling inputs of the former) coordinates. 2. The device according to claim 1, that is, so that the synchronization pulse forwarder contains OR elements whose inputs are connected to the outputs of the corresponding pulse generators and delay elements, and the outputs are connected to the inputs of the corresponding amplifiers, the outputs of which are the outputs of the first group of the driver, while the pjols 3: iet CHTOB delays are connected to the output; the corresponding generators .iiTiCon, whose inputs are the input of the clock generator, and the outputs are the outputs of the second shaper group, 3. The device according to Clause 1, which is based on the fact that the coordinate remover is made in the form of a piezoceramic truncated cone, on the basis of which Siriol electrodes are applied. Editor N.Lazarenko Compiled by A. Romanov Tehred L. Oliynyk Proofreader A.Obruchar Order 1973/50 Circulation 673 Subscription VNIIPI State Committee of the USSR for Inventions and Discoveries 1130-35, Moscow, F-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, st. Design, And