MOTION DETECTOR WITH HYBRID LENS
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United States of America Patent
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Issued Date -
Feb 21, 2013
app pub date -
Aug 8, 2012
filing date -
Aug 19, 2011
priority date (Note) -
Abandoned
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Abstract
A lens assembly for a passive infrared motion detector has one or more rows of far field Fresnel lenses arranged on a substantially cylindrical sheet and operative to collect light onto a sensor location. A plurality of rows of mid/near field Fresnel lenses are arranged on a basically spherical sheet, and the mid/near field lenses are operative to collect light onto the sensor location. An infrared motion detector also has an infrared sensor with a lens assembly having a plurality of lenses on a spherical surface collecting light from a corresponding number of zones onto said sensor, and a reflector mounted in the detector directs light collected by at least one of the lenses onto the sensor for providing one or more creep zones.
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