Selectable lens array
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United States of America Patent
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Apr 23, 2002
Grant Date -
N/A
app pub date -
Sep 14, 1999
filing date -
Sep 14, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A lens array for directing infrared light or radiation to a passive infrared detector having at least two Fresnel lenses mounted on or incorporated into the lens array. Each of the lenses has a different infrared detection pattern and the lenses on the array are adapted to be selectively indexed so that the infrared detection pattern of the array is altered by the indexing. The indexing may be accomplished by rotating the lens array or by the linear movement of the lens array.
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