SU1425738A1 - Device for reading graphic information - Google Patents

Abstract

The invention relates to automation and computing and can be used to automate the conversion of graphic information into a digital code for the purpose of the following; input to the computer. The purpose of the invention is to increase the accuracy and simplify the device. The goal is achieved by automatically changing the amplitude of the compensation pulses when the excitation current of the coordinate buses changes, which is provided by introducing the excitation converter 7 into correction signals, the clock inputs of which are connected to the information outputs of the second switch 6, and the information outputs are connected to the corresponding coordinate buses of the tablet and the second amplifier 8, the input of which is connected to the control unit. The output of the drive signal converter is a correction signal, and the output is connected to the control input of the third switch. 7 il.

Description

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The invention relates to automation and computer technology and can be used to automate the conversion of graphic information into a digital code from a computer network.

The purpose of the invention is to increase the accuracy and simplify the device.

Fig. 1 shows the structural scheme of the proposed device: for comparing a graphic information. matsii; FIG. 2 is a diagram of the control unit of FIG. 3; is a diagram of the first switch; FIG. 4 is a diagram of a second ™ switch. FIG. 5 is a diagram I of the third switch in FIG. “b -: variation of the amplitude induced in; the element of counting the signal when the current of the polling bus changes and its effect on the read accuracy of C in FIG. 7 is a schematic of the co-: ordinate unit;

 The device includes (figo) plan; shit 1 with coordinate shadnadi, first switch 2, puller 3 coordinates: nat, first Hussiliter 4 coupling element, control block 5, second I switch 6, converter 7 excitation signals into correction signals executed in the form of a transformer, , the second amplifier 8, the third commander 9, the unit 10 for determining the coordinates.

The control unit (Fig. 2) contains: a generator of 11 shshuls, button; 12, distributor 13 pulses, I element 4 delay; element I, PI 15 i element And 16, trigger 17, register: 18 shift, elements And 19- 21 ,, trigger 22, element I -23, trigger 24 and elements And 25-26 „

The first switch (Fig, 3) contains the counter 275 decoder, 28, drivers 29 and 30,

The second switch (FIG. 4) consists of a counter 31, a decoder 32 and shapers 33 and is intended to alternately excite the last tires in current pulses of B groups in the group definition mode of the bus in the selected group in the tire definition to excite the selected tire in accurate readout ,,

Transformer 7 consists of one secondary winding and primary windings in an amount equal to the number of tires in the group, and is intended for half

five

five

in the secondary winding of a signal proportional to the polling current of any coordinate bus.

The second amplifier 8 is designed to amplify the signal obtained in the secondary winding of the transformer, and is made in a known manner.

The third switch 9 (Fig. 5) consists of a counter 34 and limiting resistances 35, an analog signal switch 36, and is intended to receive amplitude-varying compensation pulses from the incoming signals to it.

The coordinate determination unit (FIG. 7) consists of an adder 37, which includes a delay element 38, a group counter 39, a bus counter 40, a precise counter 41, and a register 42 that includes coordinate registers 43 and 44, and is designed to receive the codes coordinates readable points of graphic images in accordance with the selected group, bus and the number of pulses of the exact reference.

The device works as follows.

When the device is turned on, the pulses from the output of the generator 11 through the button J2 (FIG. 2) mounted into the puller, reset all the memory elements of the device (these connections are not shown, the counter 27 of the first switch 2 is reset, thus ensuring the first group, the last bus code in group S is entered into counter 3 of the second switch 6, the third switch counter 34 is reset, through the OR element 15 the shift register 18 is set by entering the parallel code into the group definition mode, trigger 7 is set to formed mode and X coordinates

When the button is pressed, the pulses from the output of the generator 31 are fed to the distributor 13 by a pulse, to the output. The duck of which three series of pulses, which are shifted relative to each other, are formed. Seri T enters ka decoders 28 and 32 of the first and second. switches and provides the excitation in accordance with the state of the counters 27.31 through shapers 29 and 33 of the corresponding busbars 1, i.e. in this device gus, pedny tires of the first group of X coordinates (for determining the Y coordinate, shapers 30, 33 are involved)

In the absence of a signal at input 1a of control unit 5 (this will be when the polled bus is outside the sensing range of the element. 3 reads or before the read point), the T2 series pulse goes through the AND 16 element to the counting input of the counter 27 of the first switch 2 and to the counting input of the counter 39 block determining coordinates. This sets the first switch 2 into

The third input of the third switch 9 receives signals amplified by the second amplifier:; about the secondary winding of the transformer 7, whose amplitude is proportional to the current pulse flowing through the driven bus through the corresponding winding of the transformer 7 and connected to the switch inputs of the analog signals through limiting resistors 35 of different size than the current flowing through the compensation frame is reduced with each successive

This is for excitation of the second group with a 15 excitation pulse.

and in block IO of the determination of coordinates, the number of impulses is fixed according to the number of the surveyed group

When the bus is excited beyond the reading point, a signal is generated at the output of the control element 3, which is amplified by the amplifier 4 and fed through the input 1a to the control unit 5, which prohibits the passage of the pulse T2 through the element 16 to the first switch 2 to the adder 37 of the coordinate determining unit 10 and through the delay element 14 and the OR element 15 transfers the shift register 18 to the bus polling state in the group. With the bus polling mode set, the counter l 3 of the second switch 6 is reset and this excites the first bus in the selected bus; group through the decoder 32 and shaper 33 pulses of the T1 series.

In the absence of signals to the input 1a of the control unit 5, the T2 series pulses through the element 27 and go to the counting input of the counter 31 of the second switch 6 and to the counting input of the strip 40 of the block 10. When the first bus is driven beyond the reading point, the signal from the coupling element 3 is amplified The driver 4 and through the input 1a of the control unit 5 prohibits the passage of T2 series pulses through the AND 26 element, through the delay element 1 and the OR 15 element switches the shift register 18 to the exact counting mode. With the installation of this mode through the element And 25 series T1 enters the enabling input of the switch 36 analog signals, and through the element 26 and series T2 enters the counting input of counter 34 of the third switch and the counting input of counter 4 of the exact reference unit 10 coordinates. On the analogue As soon as the induced signal in the element of the coupling of the signal from the excited bus of the plate 1 exceeds the signal from the current compensation frame from the output of the amplifier 4 to the input of the control unit 5, a signal arrives which, through the element 21, stops the trigger 24 in a single state and translates register 18

shift through delay element 14. and I-UIH 15 element to the fourth (intermediate) state. With the installation of the trigger 24 in the single state, the passage of a series of TZ through the

the element AND 23. The impulse of the series-TZ from the output of the element AND 23 returns to the initial state the counters of all the switches, rewrites the code of the X coordinate from the adder 37 to the register 43

X coordinates of register 42, through delay element 38, resets counters 39-41 cyMi iaTopa 37, translates shift register 18 into group definition mode. With the installation of this mode counting

trigger i 7 is set to

determining the Y coordinate, which is similar to the X coordinate determination mode, instead of the drivers 29 of the first switch 2, the drivers 30 are connected, and in the coordinate determination unit 10, the coordinate value is copied from the adder 37 to the 44 register of the Y register 42, for doubling the read resolution by half the same equipment is served by elements I9, AND 20 and trigger 22. The latter is established in one state through element I19 by a pulse on input 2a of control unit 5 (the signals at this input are generated during excitation and tires before reading point). If the drop point is located above the conditional bus, when this conditional bus is excited, there will be no signals at the inputs 1a, 2a of the control block 5, which causes reset of the trigger 22 via the element 20. The output of the trigger 22 is used as the least significant bit of the coordinate code

: the invention of the invention

I A device for reading graphic information containing a tablet, made up of two systems of mutually orthogonally located coordinate buses, whose inputs are connected to the information outputs of the first switch, a coordinate remover, whose information input is inductively connected to the Tablet's coordinate buses, and the output connected to the input | of the first amplifier, whose outputs | are connected to the control inputs of the synchronization, the first, second, | and third outputs of which are connected | to the synchronization inputs of the first.

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second and third switches, coordinate fixing unit, syncro; The viewing input of which is connected to the fourth output of the synchronization unit, and the input is the information output of the device, while the output of the third switch is connected to the control input of the coordinate remover,

0 is characterized in that, in order to improve accuracy and simplify the device, an excitation signal converter is introduced into correction signals, the inputs of which are connected to the information outputs of the second switch, and the information outputs are connected to the corresponding coordinate buses of the tablet, and the second amplifier, input which is connected to the control output of the excitation signal converter in the correction signals, and the output is connected to the control input of the third switch,

25 °

fig 5

6

7

Claims (1)

Claim A device for reading graphic information containing a tablet made of two systems of mutually orthogonally located coordinate buses, the inputs of which are connected to the information outputs of the first 15th switch, a coordinate remover, the information input of which is inductively coupled to the coordinate buses of the tablet, and the output is connected to the input of the first amplifier, the outputs of which 20 are connected to the control inputs of the synchronization unit, the first, second, and third outputs of which are connected to the synchronization inputs of the first, 25 'of the second and third switches, coordinate determination unit, sync; the sighting input of which is connected to the fourth output of the synchronization unit, and the input is the information output of the device, while the output of the third switch is connected to the control input of the coordinate picker, characterized in that, in order to increase the accuracy and simplify the device, a converter of excitation signals into signals is introduced into it correction, the inputs of which are connected to the information outputs of the second switch, and the information outputs are connected to the corresponding coordinate buses of the tablet, and the second amplifier, input It is connected to the control output of the inverter drive signals in the correction signals, and an output connected to a control input of the third switch. Fiz. 2 of FIG. 5 3425738 6 7