Objective lens system with aspheric Fresnel elements

Details Objective lens system with aspheric Fresnel elements Objective lens system with aspheric Fresnel elements

1979-08-13

1981-10-06

Corbin, John K.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

350432, 358239, G02B 304, G02B 308

Patent

active

042931967

ABSTRACT:
A high speed projection lens system particularly adaptable for a television projection system having a viewing screen and a video image forming surface is provided. The projection lens system includes a first thin meniscus lens element convex to the projection screen having an aspherical Fresnel type surface; a second thin meniscus lens element concave to the projection screen having an aspherical Fresnel type surface and a weak third thin aspherical meniscus lens element.

REFERENCES:
patent: 3904281 (1975-09-01), Jampolsky
patent: 3909525 (1975-09-01), Fagan
patent: 4032968 (1977-06-01), Miyoshi et al.
patent: 4116223 (1978-09-01), Vasilantone

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