Wall mountable modular snap-together passive infrared detector a

Details Wall mountable modular snap-together passive infrared detector a Wall mountable modular snap-together passive infrared detector a

1982-06-21

1984-12-04

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250353, G01J 504

Patent

active

044866615

ABSTRACT:
A snap-together, passive infrared detector assembly includes a modular passive infrared detector sub-assembly defining an optical cavity. In one embodiment, the passive infrared detector sub-assembly is slidably mounted to a resilient U-shaped housing sub-assembly suitable for high wall or ceiling flush mounting. (An aesthetic cover plate is snap-locked to the U-shaped housing.) In another embodiment, the passive detector sub-assembly is mounted in a plastic housing having an aperture for high wall or ceiling surface mounting. An optical window is snap-locked onto the mouth of the optical cavity in both embodiments. Both embodiments are self-contained and fashioned substantially of a plastic material. The modular passive infrared detector sub-assembly includes an optics and an electronics module. The optics module is composed of snap-together first and second plastic mirrored members having respective arcuate metalized surfaces which define the optical cavity. The electronics module is comprised of a support member snapped to a cover member. The support and cover members have respective metalized walls which form an electromagnetically protected circuitry enclosure.

REFERENCES:
patent: 4375034 (1983-02-01), Guscott

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