Ceiling mounted passive infrared intrusion detector with prismat

Details Ceiling mounted passive infrared intrusion detector with prismat Ceiling mounted passive infrared intrusion detector with prismat

1986-09-08

1988-09-20

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, 340567, 350452, G01J 508

Patent

active

047727977

ABSTRACT:
A ceiling mounted passive infrared intrusion detector includes a window which has an exterior surface with ridges formed of intersecting planes, which are arranged to provide internal reflection of radiation received from selected angles with respect to the optical axis of the device and to deflect such radiation into a direction parallel to the optical axis. Focusing means arranged as part of the detector focuses the parallel infrared radiation onto a detecting element within the device.

REFERENCES:
patent: 4275303 (1981-06-01), Mudge
patent: 4321594 (1982-03-01), Galvin et al.
patent: 4442359 (1984-04-01), Lederer
patent: 4447726 (1984-05-01), Mudge et al.
patent: 4451734 (1984-05-01), St. Jean et al.
patent: 4484075 (1984-11-01), Kahl et al.
patent: 4510488 (1985-04-01), St. Jean et al.
patent: 4535240 (1985-08-01), Vigurs
patent: 4573758 (1986-03-01), Hecker et al.

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