JPS61193376U - - Google Patents

Description

[Brief explanation of the drawing]

Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
5 to 4 are time charts showing signal waveforms of various parts in various operating modes of the embodiment shown in FIG.
The figure is a connection diagram of the sensor used in the same embodiment, and FIGS. 6 to 9 are explanatory diagrams of detection signals by the sensor of FIG. 5. 1, 2...Movement direction of object, 3, 4...Pyroelectric element,
6...Sensor, 8...Level detector, 9, 12...Monostable multivibrator, 10...Nand gate, 1
1...OR gate, v...detection signal.

Claims (1)

[Claims for Utility Model Registration] A detection means that detects far infrared rays emitted by an object and sequentially generates signals of two polarities depending on the moving direction of the object; a level detector; a second level detector that performs a detection operation when the output of the detection means is of the other polarity; a first sustaining circuit for forming a signal that lasts for a first predetermined period of time in response to the output of the second level detector; a first logic circuit that produces an output and resets the first sustain circuit when the output of the sustain circuit is applied; and an output when the output of the second level detector and the first sustain circuit is applied. a second logic circuit that generates an output that lasts for a second predetermined period of time when the output of the first logic circuit is applied, and that resets the second sustaining circuit; an interlock circuit that blocks a signal from the first logic circuit, produces an output that lasts for a second predetermined time when the output of the second logic circuit is applied, and blocks a signal from the first logic circuit. movement direction detection device.