Fresnel lens with aspiteric grooves
DC
First Claim
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1. A Fresnel lens formed of a material capable of transmitting infrared energy rays, the lens comprising:
- a body, having a grooved surface;
the grooved surface having a plurality of grooves, which extend to the same depth;
the grooves being of different widths; and
a substantial portion of the grooves each individually having a surface formed thereon which is entirely aspherical and differs in contour from the surfaces of the other grooves.
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Abstract
A Fresnel lens formed of an infrared transmitting material has a grooved surface. The grooves all extend to the same depth, and the distances between successive grooves vary across the lens. In a circular lens, the grooves are concentric, and the distances between grooves nearer the center are longer than the distances between the grooves nearer the circumference. A substantial portion of the grooves have an aspherical surface.
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Citations
2 Claims
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1. A Fresnel lens formed of a material capable of transmitting infrared energy rays, the lens comprising:
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a body, having a grooved surface; the grooved surface having a plurality of grooves, which extend to the same depth; the grooves being of different widths; and a substantial portion of the grooves each individually having a surface formed thereon which is entirely aspherical and differs in contour from the surfaces of the other grooves.
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2. A Fresnel lens formed of a material capable of transmitting infrared energy rays, the lens comprising:
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a body, having a substantially flat grooved surface; the grooved surface having a plurality of grooves, each of which extend to the same depth; the grooves being of different widths; and a substantial portion of the grooves each individually having a surface formed thereon which is entirely aspherical and differs in contour from the surfaces of the other grooves.
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Specification
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Litigation Data
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Current AssigneeFresnel Technologies Incorporated (Fresnel Tech Incorporated)
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Original AssigneeFresnel Technologies Incorporated (Fresnel Tech Incorporated)
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InventorsClaytor, Richard N.
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Primary Examiner(s)Corbin, John K.
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Assistant Examiner(s)Sugarman, Scott J.
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Application NumberUS06/850,256Time in Patent Office964 DaysField of Search350/452, 350/432-435US Class Current359/742CPC Class CodesG02B 3/08 with discontinuous faces, e...
