SU1188877A1 - Optronic sensory selector switch - Google Patents

Abstract

1. OPTOELECTRONIC SENSOR SWITCH containing the first and second radiation sources, the first photodetector optically coupled to the first radiation source, the first and second amplifiers and the analysis unit, the first and second inputs of which are connected to the first outputs of the first and second amplifiers, respectively, and the output of the first A photodetector is connected to the input of the first amplifier, characterized in that, in order to increase the reliability of the device, a second photodetector, optically coupled to the second radiation source, is introduced into it, the third the radiation source and the third photographic optically connected with it, as well as the display unit, the third amplifier and the control unit, the outputs of the second and third photodetectors are connected to the inputs of the second and third amplifiers, respectively, the first output of the third amplifier is connected to the third input of the analysis unit, the second outputs the first, second and third amplifiers are connected respectively to the first, second and third inputs of the control unit, the output of the analysis unit is connected to the input of the display unit and the first output of the device, and One control unit to the second output of the device. 2. The device according to claim 1, characterized in that the analysis unit is made in the form of three AND elements, the outputs of which are connected to the inputs of the OR-NOT element, the first inputs of the first and second elements AND are associated with the second inputs of the second and third elements AND, respectively with the inputs of the analysis unit, the first input of the third element AND is connected to the second input S S $ 3 of the AND element and to the input of the analysis unit, and the output of the element OR is NOT connected to you (L of the device. 3. The device according to claim 1, that the control unit is made in the form of three elements NOT, two of the elements AND-NOT and the element AND whose output is connected to the output of the control unit, the inputs are connected to the outputs of the elements AND-NOT, the inputs of the first element AND-NOT are connected to the corresponding inputs of the elements NOT and the control unit CC) L, and the inputs of the second element AND-NOT connected 00 00 with the outputs of the elements NOT.

Description

The invention relates to a pulse technique and can be used in devices for processing and inputting information into a computer.

The purpose of the invention is to increase the reliability of the device by introducing a third optically coupled pair of a light receiver and control and display units.

FIG. 1 shows a functional diagram of the device; in fig. 2 is a block diagram of the analysis unit; in fig. 3 - control unit.

The fail-safe optoelectronic switch (Fig. 1) contains radiation sources 13, optically coupled 4-b photodetectors, amplifiers 7-9, display unit 10, analysis block 11, control unit 12, and outputs of photo-receivers 4-6 respectively through amplifiers 7-9 are connected respectively to the first, second and third inputs of unit 11, the first, second and third inputs of control unit 12 are connected to the second outputs of amplifiers 7-9, the output of analysis unit 11 is connected to the input of display unit 10 and is the first output of the device, and the output of block 12 is with the second output of the device.

The analysis unit 11 (FIG. 2) contains elements AND 13-15 and an element OR NOT 16, with the first input of the analysis unit 11 connected to the first input of the first element AND 13 and the second input of the second element 14, the second input of the analysis unit 11 connected to the first input of the second element And 14 and the second input of the third element And 15, the third input of the analysis unit 11 is connected to the first input of the third element And 15 and the second input of the first element And 13, the outputs of the elements And 13-15 are connected to the first, second and third inputs of the element OR NOT 16, the output of the element OR NOT 16 is the output of block 11 analog out.

The control unit 12 (Fig. 3) contains the elements NOT 17-19, the elements AND-NOT 20 and 21 and the element 22, with the first input of the control unit 12 connected to the input of the first element NOT 17 and the first input of the element AND-NOT 20, the second the input of the control unit 12 is connected to the input of the second element HE 18 and the second input of the element AND-NOT 20, the third input of the control unit 12 is connected to the input of the third element NOT 19 and the third input of the element AND-NOT 20, the outputs of the elements NOT 17-19 are connected to the first the second and third inputs of the element AND-NOT 21, the output of which is connected to the first input of the element And 22, the output of the element AND-NO 20 is connected to the second input of the element AND 22, the output of which is the output of the control unit 12.

The device works barely. When the power is turned on, the fail-safe optoelectronic touch switch is reset. Rays from sources of radiation 1–3 reach photodetectors 4–6, which form three signals. These signals are amplified by amplifiers 7-9 to the level "1 required by analysis unit 11, control unit 12. The analysis unit 11 implements the function of the major choice "2 of" 3 with negation and the three signals received from amplifiers 7-9 and "1" gives a signal "O, while the display unit 10 detects the absence of operator influence on the device. When the operator installs a finger between sources 1-3 of radiation and photodetectors 4-6, interruptions of the rays of sources 1-3 of the radiation occur, and photodetectors

Q 4-6, through amplifiers 7-9, output three signals "O" to analyzing unit 11, which are extracted by analyzing unit 11 into useful signal "1, while display unit 10 detects this effect by signaling to the operator that a fail-safe optoelectronic sensing switch is triggered.

If one of the three chains containing sources 1–3 of radiation fails, photoreceivers 4–6, amplifiers 7–9, analysis block 11, which implements the function of the majority choice “2 out of” 3, produces a useful output signal determined by the state of two chains, i.e., the switch works correctly. Simultaneously with the arrival of signals at the inputs of the analysis block 11, similar signals from amplifiers 7-9 are fed to the inputs of the block

12 control Control unit 12 checks the identity of the levels of signals outputted by amplifiers 7-9. Upon receipt of three identical signals with the level “1 or” O, block 12 generates an output signal (is Yush, Qy with the control signal of the device) with the level “O. If one or two of the three chains fail (sources 1–3 of radiation, photodetectors 4–6, amplifiers 7–9), which manifests itself as the arrival at the inputs of the block 12 for monitoring signals with combinations 110, 100,

5,001, 011, a signal is generated with a level of "1. These signals generated by the control unit 12 can be used to inform the operator of the failures that have occurred (for example, by indicating the error signal on the LED) or taken into account

0 by the system to which the proposed device is connected.

/eight

four

21

/9

f-

22

Claims (3)

1. OPTOELECTRONIC SENSOR SWITCH containing the first and second radiation sources, a first photodetector optically coupled to the first radiation source, first and second amplifiers and an analysis unit, the first and second inputs of which are connected to the first outputs of the first and second amplifiers, respectively, and the output of the first photodetector connected to the input of the first amplifier, characterized in that, in order to increase the reliability of the device, a second photodetector optically coupled to the second radiation source is introduced into it, the third source IR radiation and a third photodetector optically coupled to it, as well as an indication unit, a third amplifier and a control unit, the outputs of the second and third phtosensors being connected to the inputs of the second and third amplifiers, respectively, the first output of the third amplifier is connected to the third input of the analysis unit, the second outputs the first, second and third amplifiers are connected respectively to the first, second and third inputs of the control unit, the output of the analysis unit is connected to the input of the display unit and the first output of the device, and the output of the con Rola - to the second output device. 2. The device according to π. 1, characterized in that the analysis unit is made in the form of three AND elements, the outputs of which are connected to the inputs of the OR — NOT element, the first inputs of the first and second elements AND are connected with the second inputs of the second and third elements AND, respectively, with the inputs of the analysis unit, the first input the third AND element is connected to the second input of the first AND element and to the input of the analysis unit, § and the output of the OR element is NOT connected to the output of the device. 3. The device according to π. 1, characterized in that the control unit is made in the form of three elements NOT, two AND-NOT elements and an AND element, the output of which is connected to the output of the control unit, the inputs are connected to the outputs of the AND-NOT elements, the inputs of the first AND-NOT element are connected to the corresponding inputs of the elements NOT and the control unit, and the inputs of the second element AND are NOT connected to the outputs of the elements NOT.