Electro-optical device for detecting the presence of a body at a

Details Electro-optical device for detecting the presence of a body at a Electro-optical device for detecting the presence of a body at a

1997-04-10

1998-06-02

Allen, Stephone B.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250239, 350556, B01V 904

Patent

active

057603901

ABSTRACT:
An electro-optical device for detecting the presence of a body at an adjustable distance, with the suppression of background, comprises an emitter of a beam of light endowed with a source of a beam of direct light and with an optical transmission chamber and a receiver endowed with an optical reception chamber with a beam of reflected light and with a pair of side by side photoelectric sensors. The source of light and the pair of photoelectric sensors are integral with a supporting structure; the optical reception chamber is mobile and is rotatably supported by the supporting structure by means of pivots having axis substantially coincident with a separation area interposed between the photoelectric sensors.

REFERENCES:
patent: 3491334 (1970-01-01), Martin
patent: 4282430 (1981-08-01), Hatten et al.
patent: 4306147 (1981-12-01), Fukuyama et al.
patent: 4659922 (1987-04-01), Duncan
patent: 4782224 (1988-11-01), Haas et al.
patent: 5446281 (1995-08-01), Taranowski et al.
Patent Abstracts of Japan, vol 18, No. 493 (E-1606), 14 Sep. 1994.

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