Optical path blockage detecting device

Details Optical path blockage detecting device Optical path blockage detecting device

1987-02-27

1988-09-27

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250227, 340365P, 340712, G08C 2100, G01V 904

Patent

active

047744049

ABSTRACT:
An optical path blockage detecting device includes optical conductive members located between light emitting elements and light receptor elements and extending parallel to optical paths defined between the light emitting and receptor elements. Each optical conductive member is combined with a light absorbing member which absorbs undesired beams of light so as to improve the optical directivity of incident light and improve the signal-to-noise ratio of the device.

REFERENCES:
patent: 4333704 (1982-06-01), Steinberg
patent: 4616928 (1986-10-01), Leavitt et al.
patent: 4695827 (1987-09-01), Beining et al.

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