Fresnel lens

Details Fresnel lens Fresnel lens

1991-09-25

1993-03-02

Fields, Carolyn E.

Optical: systems and elements

Lens

With multipart element

G02B 308

Patent

active

051914794

ABSTRACT:
A Fresnel lens in use for a projector lens comprising a glass plate, a Fresnel lens body integrally formed on one surface of the glass plate, and a reflective layer formed on an annularly grooved surface of the lens body. The present invention provides a Fresnel lens, fabricated with a low cost, having sufficient hardness as a document support and free from any of ghost images or image distortions when used in a projector.

REFERENCES:
patent: 3628854 (1971-12-01), Jampolsky
patent: 3982822 (1976-09-01), Conder et al.
patent: 4530736 (1985-07-01), Mutter
patent: 4737447 (1988-04-01), Suzuki et al.
patent: 4904063 (1990-02-01), Okada et al.

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