G - Physics – 08 – B
Patent
G - Physics
08
B
88/99, 340/124.4
G08B 13/18 (2006.01) G08B 13/193 (2006.01)
Patent
CA 1195752
ABSTRACT OF THE DISCLOSURE A passive infrared intrustion detector is provided with a lens which has a plurality of first lens segments, each for focusing infrared radiation from various beams of sensitivity onto an infrared detecting element. Associated with each of the first lens segments is a second lens seg- ment, with a displaced lens center, which serves to focus light originating within the detector device into a radiated beam, which corresponds in space to the region of sensi- tivity of the infrared beams.
428338
Baldwin John
Kahl William G. Jr.
Baldwin John
Johnson & Hicks
Kahl William G. Jr.
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