Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-02-28
1993-08-03
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022721, 340556, 49 25, G01V 904, H01J 516, G08B 1318
Patent
active
052331857
ABSTRACT:
A light beam transmitter and receiver are located in or near a door opener enclosure, and fiber optics connect the transmitter and receiver to the sides of the door opening. Lens arrangements are attached to the ends of the optic cables and are mounted near the bottom of the door frame. Thus, the transmitter and receiver do not need to be located near the door which eliminates the need for wiring from the enclosure to the door area and protects the transmitter and detector from physical abuse at the doorway.
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GMI Holdings Inc.
Messinger Michael
Nelms David C.
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