SU1251316A1 - Sensory keyboard - Google Patents

Abstract

The invention relates to the field of pulsed technology. It can be used in control panels of electronic devices. The purpose of the invention is to increase the reliability achieved by reducing hardware costs by increasing the number n 131 And III iii aiimil J 3FfU-j, I of the touch pads. To achieve this goal, the device containing the generator 1, M of split touch pads 2, consisting of the first 3 and second 4 sensor plates, has a shaper of 5 n phase signals, (M + h) - output variable resistor 6, filter 7 , control unit 8, unit 9 comparison. The description of the invention also provides the schematics of the control unit and the comparator unit. In order to avoid multiple triggers at the time of touching and lifting a finger, the control unit executes commands to enable the deactivation of the comparison block during the transition process of the filter 7 and stop its operation immediately after removing the finger. 2 .p „, 5 ill. L. I .I, JFrr - L-brdLJbtrJ 41-

Description

H3o6peTeHV e refers to a pulsed technique and can be used in the nyjTbrax control of radio electronic ycrpoi icTB.

The purpose of the invention is to increase reliability, to achieve, with an even reduction in hardware costs with an increase in the number of touch pads.

FIG. 1 shows a block diagram of the device; FIG. 2 shows the functional block diagram of the control unit; in fig. 3 - the same block C1) avnr-ni; in fig. 4 - temporary diagrams pammJ work unit etching; in FIG. 5, the same unit of comparison.

The device; Fig. 1) contains a generator 1J M of split touch pads 2. consisting of the first 3 N second 4 sensor plates, FoI) the suppressor 5 h-phase signal, the input of which is connected to the output of the generator 1, and the outputs Comm. Ny with. the corresponding inputs i M +:.; - a voltage variable resistor 6, phyonter 7, output-, the KOi oporo stroke is connected to the input of block 8, and the first one, for comparison block 9, the output of which is the output of the device .

The control unit 8 (FIG. 2) contains buffers; us15li gel 10, Ko torogo connected to the input of pervog d uhpoluperiodnogo rectifier 11, the second -dvuhpolutteriodny rectifier 12 outputs dvyxrtOJiypepiodnyx vtr tifiers 11 and 12 are connected to the inputs Correspondingly first 3 and about 1 vtorog tripch-ditch IIlNm j Ta , the output of the second 14 Schmitt trigger;

management I

Comparison side 9 (.З,) contains a null indicator 17. Which input I o is the first input of comparison unit 9, the second input of which is P (5D is connected to the counting input of counter 18, the third input is to input O of the installation. Counter 18 the outputs of which are connected to the corresponding inputs of the reg; memory 19, the output of the null indicator 17 is connected to the D input of the first D-flip-flop 20, to the synchronization input of which the inverter 2 is connected the output of the first 13-trigger 20 is connected to c input : po-nadia of the second P-trigger 22 and through the delay element 23 to the first input of the element

H 24, and the fourth input of the comparison unit 9 is connected to the 11 input of the second P-flip-flop 22,

The touch keyboard works the trail K1p; im image.

The voltage at the outputs of the imaging unit 5 h -phase (.) Signal for i 4 is eliminated by the following equations:

20

25

where is l. 1 / - - apr of the first fourth outputs of the former 5 four-phase signal;

IJ — voltage amtglite; - generator frequency 1; - time

The placement at any point x (M + i) of the output variable resistor 6, located between the extreme points, in these conditions is described by the equation

f -.

R, R.

i2nft-f) (2

Where

".L.

U, is the voltage at x,,. Resistance 1asc () - output variable resistor 6 is chalk (top point and point V;; - section resistance (M + n) - output variable resistor 6 between the extreme points.

If we now connect the second 4 sensor plate of one of the M se sor} shx pads 2 and close the paldem or some conductor - I101M with its first 3 touch plate of this touch pad 2 to the point x, then at the output connecting all M first sensor plates 3, Vits voltage U, equal to

and"

-K. (R,

R)

sinCoTTft-v), (i, where K is a coefficient that determines closure conditions.

As can be seen from the equations Ч2) and (3), the phase of the signal U does not depend on the closing conditions, but depends on the location of the closing point.

Thus, the signal U is fed to the input of the filter 7, which is tuned to the frequency of the generator 1.

The signals from the filter 7 and from one of the phases of the imaging unit 5 and the phase signal arrive at the comparison unit 9, where they are compared in phase, which, as mentioned above, is unambiguously related to the touch position.

In order to avoid multiple triggers at the time of touching and lifting a finger, the control unit 8, using signals from the output of the filter 7, allows the comparison unit 9 to work not immediately after the appearance of the signal at the output of the filter 7, but with a delay t t during the transition process of the filter 7 and the block stops working

25

The signal and, -p is fed to the zero input of the indicator 17, the signal goes to the counting} L1Y input of the counter 18 and through the inverter 21 to the synchronization input of the first D-trigger 20, the signal Uj is fed to the input O of the counter 18,

The cycle of operation of the counter 18 is determined by the forced installation of the last signal in the signal Uj (Fig. 3) The conditional diagram of the comparison ratio after removing a finger, using the fact that there is no signal at the first input of the control unit 8.

The control unit 8 (FIG. 2, forms at its output a Up resolution signal determining the time domain when the signal U is from the output, the filter in counter 18 (CS) for coefficient 7 has undistorted parameters.

The control unit 8 operates as follows.

At the moment when a finger touches the touch pad 2, the signal U appears on the input of the phipper 7 and the first input of the control unit 8, and

40

after time t, the steady state signal L / appears at the output of filter 7 (fig. 4b). These signals then go to the corresponding two-half-wave rectifiers 11 and 12, where the envelope signals U 45 and d are formed (Fig. 4a, b).

Moreover, the signal U arrives. To the input of the first full-wave lateral mitel 11 via the buffer amplifier 10, matching the last with. 50 touch pads 2.

The first 13 and second 14 Schmitt triggers form U and U signals from the corresponding envelopes (Fig. 4c, d) with steep fronts, respectively. The delay element 15 generates a signal by delaying the positive edge of the signal U.

Division 16 is shown in FIG. 3. The value of the phase shift between the signals IF and Uj is measured at the moment the signal Dtp passes through the zero level, for which the zero-indicator 17 generates a signal Un (fig. 3) that has passed through the first. The D-trigger 20, the delay element 23 and the AND element 24, comes in the form of a signal U (; (Fig. Ze) to the input of the write enable of the memory register 19. In this case

signal

II

its positive

the front gives the command to write to the memory register 19 the code value (KRU, which at that moment was in the counter 18, for example, the code of the number 10 (FIG. 3).

Thus, the value of the code in memory register 19 corresponds to the phase shift in e of the clock pulses U ;. and the number of the touch pad 2, to which the operator's finger was touched.

The first D-trigger 20 is necessary to prevent the write pulse Uj. (Fig. Ze) from coinciding with the moment of code change in the counter 18,

on the value of t (fig.Ab), the need for which is described earlier.

Element 16 forms from the signals and and and, the resolution signal Up (FIG. 4e), the positive front of which is formed on the positive edge of the signal I), and the negative edge on the negative front of the signal

ten

15

20

25

Nala -1,

Comparison unit 9 (FIG. 3) operates as follows.

The phase shift by the reference phase of the signal and (FIG. 5a) coming from one of the outputs of the shaper 5h phase signal to the third input of the comparison unit 9 and the U signal (Fig. 3b) is filled with a clock pulse (fig.5g), the number of which is determined by the phase shift and, therefore, by the touch point.

The signal and, -p is fed to the input of the zero-indicator 17, the signal is fed to the account} L1Y input of the counter 18 and through the inverter 21 to the synchronization input of the first D-trigger 22, the signal Uj is fed to the input O of the installation of the counter 18,

The cycle of operation of the counter 18 is determined by the forced installation of the last signal in O with the signal Uj (Fig. 3a. Conditional state diagram

t-d in the counter 18 (KS) for

d in the counter 18 (COP) for the coefficient

The division division 16 is shown in FIG. The value of the phase shift between the signals if and Uj is measured at the moment of the transition of the signal Dtp through the zero level, for which the zero indicator 17 generates a signal Un (fig. D) that j passes through the first .D-trigger 20, delay element 23 and the element 24, arrives in the form of a signal U (; (FIG. Ze) to the input of the write resolution of the memory register 19. Here

signal

II

its positive

the front gives the command to write to the memory register 19 the code value (KRU, which at that moment was in the counter 18, for example the code of the number 10 (FIG. 3 and)).

Thus, the value of the code in memory register 19 corresponds to the phase shift in e of the clock pulses U ;. and the number of the touch pad 2, to which the operator touched the finger.

The first D-trigger 20 is necessary to prevent the write pulse Uj. (Fig. Ze) from coinciding with the moment of code change in the counter 18,

since the signal and (figv) due to inverter 21 is synchronized by the negative front of the sync and pyJ uca U (fig 5g) and at the output of the first D trigger 20 a signal U, is generated. whose fronts reliably fall on t. the middle between the moments of changing the code in the counter 18 (d „e),

The second, b-trigger 22 Heo6xpAHNi for the implementation of the synchronization of the signal and the resolution of the signal (Fig. 3) with the signal (Fig. 3b) of the null indicator 17. to exclude a false measurement of the phase shift in the first period of the i-n signal and to: allow the rewriting of the counter code 18 to the memory register 19. The code is written into memory register 19 along all the allowed edges of the U signal. In order to fix the paldems touching by the operator of the touchpad 2, the second 4 sensor plate of which is connected to the moving output O l + h) of the output resistor 65. This is accomplished with an AND 24 element, the first input of which through the delay element 23 is connected to the output of the first D trigger 20, the delay Element 23 is used to search for the code entry in register 19 memory in momen ir completion signal (ing "5).

Formula and 3 onbet e I

1. A touch keyboard containing a generator and split-touch pads consisting of M first sessional; plates, connected- one with the other, and M second sensory plates, so that, in order to increase reliability, a shaper and -phase signal, C + and) - output signal are introduced into it a variable resistor, a filter J unit control unit, and a comparison unit, with the generator generator connected to the input of the co-h h-phase controller, p. the outputs of which are connected to the corresponding first and second extreme and) intermediate terminals (M + h) -output variable resistor, M second sensing plates under the corresponding M intermediate terminals | M -f-ti I-output variable resistor, the first M sensor plates are connected to the filter input and the first input of the control unit, the filter is connected to the second input of the control unit and the first input of the comparator unit, the second input of which is connected to the generator output, the third input to one of the outputs aznogo fourth input signal - to the output of the control unit, and the comparing unit output is the output device,

2, Keyboard software & 1, that is to say that the control unit contains a series-connected buffer amplifier, the input of which is the first input of the control unit, the first rectifier, the first trigger, the output of which is connected to the first input PI, the second rectifier connected in series, the input of which is the second input of the control unit, the second Pygt trigger and the delay element, the input of which is connected to the second input of the And element, the output of the latter is the output of the etching unit.

The Keyboard is in accordance with clause I, which means that the comparator unit contains a null-indor, whose input is the primary input of the comparator unit, the output of the null indicator is connected to the D input of the first D - a trigger whose output is connected to the I- input of the second D trigger and the input of the delay element whose output is connected to the first input of the And element, the second input of which is connected to the output of the second D of the trigger, and the output of the And element connected to the synchronization input of the memory register , to the infyrmy inputs which connect The counter, whose input is connected to the second input of the comparison unit and through the inverter to the C input of the first D-trigger, the counter input is the third output of the comparison unit, the D input of the second J) trigger is the fourth input of the comparison unit, output memory registers are outputs of a comparison unit.

FIG. J

Editor N.Slobod nickname

Compiled by E, Breslavets

Tehred L.Serdyukova Proofreader M.Samborska

Order 4426/58 Circulation 816 Subscription

BNIIPI USSR State Committee

for inventions and discoveries 113035 ,, Moscow, F-ZZ Raushsk nab ,, d.4 / 5

Production and printing company, Uzhgorod, Projecto st., 4

Claims (3)

Claim 1. A touch keyboard containing a generator and M split touch pads, consisting of M first sensor plates connected to one another and M second sensor plates, so that in order to to increase reliability, a shaper of a c-phase signal, a (M + o) output variable resistor, a filter, a control unit and a comparison unit are introduced into it, and the generator output is connected to the input of the shaper of the h-phase signal, oh. the outputs of which are connected to the corresponding first and second extreme and (b-2) intermediate terminals of the (M + h) output variable resistor, M second sensor plates are connected to the corresponding AND prom 316 6 daily outputs | M <-n ΐ-output variable resistor, the first M sensor plates are connected to the input of the filter and the first input of the control unit, the output of the filter is connected to the second input of the control unit and the first input of the comparison unit, the second input of which is connected to the output generator, the third input is to one of the outputs of the 6-phase signal former, the fourth input is to the output of the control unit, and the output of the comparison unit is the output of the device. 2. The keyboard according to π.1, characterized in that the control unit contains a series-connected buffer amplifier, the input of which is the first input of the control unit, the first rectifier, the first Schmitt trigger, the output of which is connected to the first input of the element And, the second rectifier is connected in series, the input which is the second input of the control unit, the second Schmitt trigger and a delay element, the output of which is connected to the second input of the AND element, the output of the latter is the output of the control unit. 3, Keyboard pop. 1, characterized in that the comparison unit contains a null indicator, the input of which is the first input of the comparison unit, the output of the null indicator is connected to the D input of the first D trigger, the output of which is connected to the 6 input of the second D - of the trigger and the input of the delay element, the output of which is connected to the first input of the And element, the second input of which is connected to the output of the second D-trigger, the output of the And element is connected to the synchronization input of the memory register, to the information inputs of which the corresponding outputs are connected! a counter whose input is connected to the second input of the comparison unit and through the inverter to the C-input of the first D-trigger, the counter input is the third input of the comparison unit, the D-input of the second (D-trigger is the fourth input of the comparison unit, the outputs of the memory register are outputs block comparison. 125; 316 Phage Z FIG. 3 Fie 41251316