Optical: systems and elements – Lens – With multipart element
Patent
1994-04-15
1997-06-17
Sugarman, Scott J.
Optical: systems and elements
Lens
With multipart element
359708, G02B 308, G02B 1318
Patent
active
RE0355348
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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1.8 Foot Focal Length Lens, 15 Foot Focal Lens and 1.35" LODIFF.TM. Lens, Grooves Out Molded in PolyIR.RTM.2 0.015".
Bradley James E.
Fresnel Technologies Inc.
Sugarman Scott J.
LandOfFree
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