Fresnel lens sheet and rear projection screen

Details Fresnel lens sheet and rear projection screen Fresnel lens sheet and rear projection screen

2006-01-17

2006-01-17

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With multipart element

C359S457000, C359S743000

Reexamination Certificate

active

06987624

ABSTRACT:
A Fresnel lens sheet has a light-receiving surface and a light-emitting surface. The light-receiving surface is provided with a plurality of prism groups, each including a plurality of straight or circular prisms. Each of the prisms of the prism groups has a total reflection surface that reflects incident light totally toward a viewing side. The height of the prisms formed in a predetermined specific region in the light-receiving surface of the Fresnel lens sheet is bigger than that of the prisms in another region.

REFERENCES:
patent: 4755921 (1988-07-01), Nelson
patent: 5710671 (1998-01-01), Bichlmaier
patent: 60-173533 (1985-09-01), None
patent: 61-208041 (1986-09-01), None
patent: 63-30835 (1988-02-01), None
patent: 63-32528 (1988-02-01), None
patent: 63-139331 (1988-06-01), None
patent: 5-72634 (1993-03-01), None

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