Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1982-05-17
1984-11-20
Howell, Janice A.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
250353, G01J 504, G01J 508
Patent
active
044840756
ABSTRACT:
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 segment, 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 sensitivity of the infrared beams.
REFERENCES:
patent: 4275303 (1981-06-01), Mudge
patent: 4321594 (1982-03-01), Galvin et al.
Baldwin John
Kahl, Jr. William G.
Cerberus AG
Hannaher Constantine
Howell Janice A.
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