Apparatus for detecting the presence and position of an object

Details Apparatus for detecting the presence and position of an object Apparatus for detecting the presence and position of an object

1988-09-22

1991-02-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250561, G01V 904

Patent

active

049964151

ABSTRACT:
Here is disclosed a photoelectric detector comprising first and second light sources respectively having different light emitting areas, a photoelectric transducer member adapted to receive the light emitted from these light sources and then reflected on an object to be detected, and a signal processing circuit functioning to separate electric signals corresponding to the first and second light sources from an output of the photoelectric transducer member and to compare these separated two electric signals to each other so that presence or absence and a position of the object are detected on the basis of such comparison of the two electric signals.

REFERENCES:
patent: 3187185 (1965-06-01), Milnes
patent: 3393600 (1968-07-01), Bess
patent: 3576371 (1971-04-01), Ulicki
patent: 3781111 (1973-12-01), Fletcher
patent: 3950098 (1976-04-01), Caine
patent: 4514083 (1985-04-01), Fukuoka
patent: 4736097 (1988-04-01), Philipp
patent: 4760269 (1988-07-01), McKenna

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