G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 3/08 (2006.01) G01J 5/08 (2006.01)
Patent
CA 2222663
A composite Fresnel lens useful in an infrared passive detection system includes an array of Fresnel lens segments having a given vertical centerline and a curvature of a given radius. The Fresnel lens segments fall in first and second groups. Each Fresnel lens segment in the first group has a long detection range and a width less than one-third of the diameter of an original whole Fresnel lens from which the segment was taken. Also, each lens segment of the first group has a geometrical center located horizontally from the vertical centerline of the array along the curvature of the array through a circumferential distance less than one-fourth of the radius of curvature of the array. Each Fresnel lens segment in the second group has a short detection range less than the long detection range by a predetermined amount and a width less than one-third of the diameter of an original whole Fresnel lens from which the segment was taken. Also, each lens segments in the second group has a geometrical center located horizontally from the vertical centerline of the array along the curvature of the array through a circumferential distance less than one- half of the radius of curvature of the array. The Fresnel lens segments have respective optical centers which are aligned along the vertical centerline of the array. First and second Fresnel lens segments are aligned along the vertical centerline with the first Fresnel lens segment being the same in width as, being greater in length than, and disposed above, the second Fresnel lens segment. Third and fourth Fresnel lens segments are smaller in both length and width than the first Fresnel lens segment and disposed adjacent to opposite vertical sides of the first Fresnel lens segment offset from the vertical centerline. Fifth and sixth Fresnel lens segments are the same in length as and smaller in width than the second Fresnel lens segment and are disposed adjacent to opposite vertical sides of the second Fresnel lens segment offset from the vertical centerline. First and second Fresnel lens segments are in the first group while third, fourth, fifth and sixth Fresnel lens segments are in the second group.
Finlayson & Singlehurst
Hubbell Incorporated
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