Photoelectric proximity switch

Details Photoelectric proximity switch Photoelectric proximity switch

2005-01-04

2005-01-04

Allen, Stephone B. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S222100, C340S556000

Reexamination Certificate

active

06838655

ABSTRACT:
Photoelectric proximity switch for detecting the presence of an object in a monitored area. A light pulse transmitter emits transmitting light pulses into the monitored area. The pulses are triggered by an output signal of a random signal generator or a pseudo-random signal generator and are emitted with a time interval between them. A light receiver is arranged in relation to the light pulse transmitter and to the monitored area such that in the absence of an object to be detected in the monitored area, the receiver receives essentially no light from the light pulse transmitter, but in the presence of an object to be detected in the monitored area, it receives such light from the light pulse transmitter due to reflection that a receiving signal evaluating device connected to the light receiver and to random signal generator or the pseudo-random signal generator delivers an object detection signal.

REFERENCES:
patent: 5243182 (1993-09-01), Murata et al.
patent: 5250801 (1993-10-01), Grozinger et al.
patent: 6455839 (2002-09-01), O'Connor et al.
patent: 4031142 (1992-04-01), None
patent: 19926214 (2001-01-01), None

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