Passive infrared detector
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United States of America Patent
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Apr 21, 1992
Grant Date -
N/A
app pub date -
Sep 22, 1989
filing date -
Sep 22, 1989
priority date (Note) -
Expired
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Abstract
A passive infrared detector, including a pyroelectric sensor with three pairs of contiguous, active elements and a Fresnel lens with a plurality of segments each of which has an optical center and an equivalent focal length, each pair of active elements disposed in different plane, with each optical center juxtaposed to the plane of at least one of those active elements, substantially at the focal length.
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