SU1420663A1 - Touchless switch - Google Patents

Abstract

The invention can be used in devices for input and output of information. The sensor switch contains generators 1 and 2, capacitor 5, element I-HE 4, inverter 3, acoustic emitters 6 and 7, sounds 8 and 9, and output 10. The touch switch has improved performance characteristics due to the operator’s electrical safety avoiding contact with the most recently subjected to electrical voltage elements. 1 hp f-ly, 2 ill.

Description

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The invention relates to a pulse technique and can be used in input and output devices.

The purpose of the invention is to improve the performance characteristics by increasing the electrical safety of the operator by eliminating the contact of the device elements under electrical voltage.

FIG. 1 shows an electrical functional diagram of a touch switch in FIG. 2 —a pulse generator circuit.

The touch switch (Fig. 1) contains the first 1 and second 2 pulse generators, inverter 3, the element AND-4, the capacitor 5, the first acoustic emitter 6, the second acoustic emitter 7, the first 8 and second 9 sound guides and output 10, and the outputs the first and second generators 1 and 2 are connected respectively to the first and second acoustic radiators 6 and 7, the outputs of which are connected to the inputs of the first and second sound drivers 8 and 9, respectively, the output of the second generator 2 inverter 3 is connected to the second entry element AND NOT 4, the first entry is It is connected to the output of the first generator 1, and the capacitor 5 is connected between the second inputs of the first and second generators 1 and 2, respectively. In addition, the first 1 and second 2 generators each consist of transistor 11, capacitor 12, first and second inverters 13 and 14, respectively, and the collector of transistor 11 is connected via serially connected first second inverters 13 and 14 to the output of the generator, and the capacitor 12 is connected one output with the base of the transistor 11 and the first input of the generator, and the second output - with the output of the first inverter 1 3 and the second input of the generator.

Touch switch works as follows.

The generators 1 and 2 pulses (figure 1 is strictly tuned to the same frequency. The parameters of the pulses of the generators 1 and 2 are identical. Due to the capacitor 5 connection, the generators 1 and Z operate in mutual synchronization mode and the output signals have a zero phase shift, but opposite polarity

and the output signal 10 corresponds to It 4 II.

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As acoustic emitters 6 and 7, TM-2M telephone capsules are used, with sound conductors connected to the outputs, which are performed by PVC tubes. Pick parameters are selected from

0 calculate the sound propagation in the air and the pulse generation frequency.

Emitters 6 and 7 perform the feedback function in generators 1 and 2 pulses. If you change the reverse

connection in generators 1 and 2, respectively, change the output parameters of these generators - the frequency and duration.

So, generators 1 and 2 are tuned.

0 on one frequency and are in mutual synchronization mode, the sound guides are open.

When the sound guide 8 or 9 overlaps (when the operator touches the open hole of the tube with a finger), the standing wave mode is realized. A beep coming from an acoustic emitter 6 or 7 is reflected from the operator’s finger and acts on

0 the membrane of this radiator is in opposite phase, thereby changing the parameters of the acoustic radiator (feedback). The feedback in the generator is changed, thereby causing the mutual synchronization of generators 1 and 2, i.e. a phase shift occurs, the interval between the signals at the inputs of the AND-HE 4 element and at its output appears a signal with the frequency and duration of one of the generators (1.2). The mutual synchronization depth is determined by the value (directly proportional to) of the capacitor 5.

Desynchronization when closing the sound guide occurs instantly. The presence of the oscillation frequency at the output of the NAND 4 element determines the state of the touch switch.

When opening the sound guide 8 or 9, mutual synchronization is instantaneous,

0 is set, and at the output of the AND-HER element 4, the unit logic level appears again. Scheme gtov to the next input-information.

Claims (2)

1. Touch switch containing the first generator, condensation 5 0 five a torus and an NAND element, the first input of which is connected to the output of the first generator, characterized in that, in order to improve the performance characteristics by increasing the operator’s electrical safety by avoiding the latter touching the device elements under electrical voltage, a second generator is introduced into it, the inverter, the first and second acoustic emitters, the first and second acoustic codes, with the first and second acoustic and, respectively, connected between the output and the first input of the first and second generators recipients whose outputs are connected to the input of the first and second sound outputs are not plugged, the second output generator i 12 Lx1 FIG. 2 through the inverter is connected to the second input of the element AND-NOT, the output of which is connected to the output of the device, and a capacitor is connected between the second inputs of the first and second generators, 2. The switch according to claim 1, about t - the fact that the first and the second generator consists each of a pn-type transistor, a first and a second inverter and a capacitor, the first terminal of which is connected to the base of the transistor and the first input of the generator, the emitter of the transistor. connected to the common bus, the collector of the transistor through the first inverter is connected to the second output of the capacitor, the second input of the generator and the input of the second inverter, the output of which is connected to the output of the generator. TK one Out