Fresnel lens

Details Fresnel lens Fresnel lens

1991-03-08

1992-09-29

Dzierzynski, Paul M.

Optical: systems and elements

Lens

With multipart element

359565, 359571, G02B 308

Patent

active

051518260

ABSTRACT:
A fresnel lens in which each of the facets is so dimensioned and configured that the distance between the facet and a focal point of the lens is (n+k) .lambda. where n is an integer, .lambda. is the wavelength of the radiation passing through the lens, and k is a fraction between 0 and 1 which is substantially constant for any facet over the entire face of the lens. Preferably the lens comprises a plurality of zones, each comprising a number of facets, the integer n being constant for each facet of each said zone, but being different for facets of different zones.

REFERENCES:
patent: 4637697 (1987-01-01), Freeman
patent: 4787722 (1988-11-01), Claytor

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