Reflected light sensor having dual emitters and receivers

Details Reflected light sensor having dual emitters and receivers Reflected light sensor having dual emitters and receivers

1991-12-13

1993-07-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250221, 2502221, 356 1, G01V 904

Patent

active

052256898

ABSTRACT:
A reflected light sensor having a light transmitter including at least two mutually independent light sources and a light receiver including at least two separately evaluatable photosensitive elements. A switching point or distance limit of the light sensor can be continuously varied within a defined sensing range by inversely and continuously controlling currents of the light sources in accordance with a control voltage U.sub.St,LED, or by continuously varying a first and a second independent control voltage thereby controlling gains of signals at the output of the photosensitive elements.

REFERENCES:
patent: 4282430 (1981-08-01), Hatten et al.
patent: 4659922 (1987-04-01), Duncan
patent: 4716298 (1987-12-01), Etoh
patent: 4782224 (1988-11-01), Haas et al.
patent: 4899041 (1990-02-01), Fetzer

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