Ceiling mounted passive infrared intrusion detector with dome sh

Details Ceiling mounted passive infrared intrusion detector with dome sh Ceiling mounted passive infrared intrusion detector with dome sh

1986-01-28

1988-07-12

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250353, G01J 100

Patent

active

047572043

ABSTRACT:
A passive infrared intrusion detector is arranged for mounting to the ceiling of a room to be protected. Infrared radiation from points within the room is focused onto an infrared sensing element by a multi-segment dome-shaped lens. The multi-segment lens in a preferred embodiment has central, downwardly facing beams of infrared sensitivity and other beams of infrared sensitivity at multiple azimuth angles at selected elevation angles.

REFERENCES:
patent: 4052616 (1977-10-01), Keller
patent: 4233493 (1980-11-01), Nath
patent: 4271360 (1981-06-01), Ward
patent: 4275303 (1981-06-01), Mudge
patent: 4364030 (1982-12-01), Rossin
patent: 4429224 (1984-01-01), Wagli et al.
patent: 4484075 (1984-11-01), Kahl et al.
patent: 4514630 (1985-04-01), Takahashi
patent: 4647149 (1987-03-01), McCartney et al.
Passiver Infrarot-Melder SIRM/G dated Oct., 1985 by BBC Brown Boveri.

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