JPS63122892U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a circuit configuration diagram of the embodiment, Fig. 2 is a time chart of the main points of the circuit in Fig. 1, Fig. 3 a, b,
4a, b and 5a, b are configuration and waveform example diagrams of a window comparator, FIG. 6 is a configuration diagram showing another embodiment of the sensor section, and FIG. 7 a, b is a sensor of a conventional example. FIG. Explanation of symbols: 1...Sensor unit, 2...Multiplexer, 3...Discrimination unit, 4...Alarm signal generation unit,
4...Reed switch, 6...Magnet, 7...
...Analog switch, 8...Counter, 9...Window comparator, 10, 11...Comparator, 1
2...Clock oscillator, 13...Reset circuit, 14...Gate circuit, 15...Flip-flop, 16...Oscillator, 17...Drive circuit, 18...Speaker, 19...Lamp drive circuit, 20... lamp.

Claims (1)

[Scope of utility model registration request] A plurality of sensor sections including a circuit in which a resistor of a predetermined value is connected in series to a switching element that detects the movement of an object to prevent theft or the like, and the plurality of sensor sections are connected to the input side. a multiplexer for conducting the sensors one by one to the output side; and a predetermined reference voltage range connected to the output side of the multiplexer and comprising a voltage value resulting from the current flowing through the resistor when the switching element is closed. is set and the voltage value is out of the reference voltage range, a discrimination unit outputs a command signal, and an alarm unit notifies an abnormality using the command signal.