Imaging lens for infrared cameras
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United States of America Patent
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Jan 6, 2009
Grant Date -
Jan 4, 2007
app pub date -
Sep 1, 2006
filing date -
Oct 7, 2002
priority date (Note) -
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Abstract
An infrared imaging device is provided which comprises first and second plastic Fresnel lenses that are in optical communication with each other. Each of the first and second lenses have a first major surface which is convex and a second major surface which comprises a Fresnel surface. The first lens is adapted to mimic a meniscus asphere correct for conjugates of infinity and for the focal length of said first lens, and the second lens is adapted to mimic a meniscus asphere and is further adapted to act as a field flattener.
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