Optical switch for an automatic door

Details Optical switch for an automatic door Optical switch for an automatic door

1982-06-21

1985-09-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250227, G01V 904

Patent

active

045394741

ABSTRACT:
A passive optical switch for an automatic door for opening and closing a door comprises a light receiving portion provided with a segmented light receiving surface formed by a number of the optical fiber fluxes so as to be adjusted to the focus of a lens, a phototube cell converter portion connected to each of the optical fiber fluxes extending from said light receiving portion, a voltage change detecting portion for detecting the change of an output of said phototube cell converter portion and a direction discriminator circuit for analyzing a detecting signal emitted from said voltage change detecting portion, whereby an automatic opening and closing of a door may be effected by discriminating onward movement of a passing body by detecting the change of an output emitted from said phototube cell converter portion caused by a passing body.

REFERENCES:
patent: 3535528 (1970-10-01), Strickland
patent: 3749924 (1973-07-01), Vischulis
patent: 3789384 (1974-01-01), Akers
patent: 3852592 (1974-12-01), Scoville
patent: 4068222 (1978-01-01), Treviranus
patent: 4403142 (1983-09-01), Kondo

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