Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Plural radiant energy responsive devices
Patent
1987-10-14
1989-10-10
Groody, James J.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Plural radiant energy responsive devices
250221, 250353, 250342, 315158, 315159, 340567, G01J 508, G08B 1318
Patent
active
048734691
ABSTRACT:
A switch assembly actuated by passive infrared radiation for operating a light in a space, the switch assembly including an optical system which senses infrared radiation over a 180.degree. range in horizontal plane including two separate vertical fields of view, a generally horizontal "look-out" field and a vertical semi cone-shaped "look-down" sensing field for directing to a common sensing element passive infrared radiation produced by a person moving within the sensing field of the switch assembly, the sensing element connected to a control circuit which responsively turns on the light, maintains the light on while the person remains in the space, and turns the light off automatically when the person leaves the space. The switch assembly includes a one-piece optical shell enclosed within a housing which is adapted for installation in a conventional light switch box in room. Another embodiment of the switch assembly is adapted for mounting on the exterior wall of a building for controlling the energization of an exterior light, turning the light on automatically whenever a person approaches the building.
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Davidson Curtis R.
Ko Wai-Shing
Whitehurst Thomas
Young William A.
Groody James J.
Pittway Corporation
Powell Mark R.
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