Fresnel lens with aspiteric grooves

Details Fresnel lens with aspiteric grooves Fresnel lens with aspiteric grooves

1986-04-10

1988-11-29

Corbin, John K.

350432, G02B 308, G02B 1318

Patent

active

047877227

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.

REFERENCES:
patent: 3390399 (1968-06-01), Leonard
patent: 3991741 (1976-11-01), Northrup, Jr. et al.
patent: 4204881 (1980-05-01), McGreen
patent: 4210391 (1980-07-01), Cohen
patent: 4293196 (1981-10-01), Hilbert
patent: 4340283 (1982-07-01), Cohen
patent: 4391495 (1983-07-01), Mazurkewitz

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