Rear projection screen

Details Rear projection screen Rear projection screen

1989-01-09

1990-09-04

Wintercorn, Richard A.

G03B 2160

Patent

active

049539485

ABSTRACT:
Provided is a rear projection screen formed with entrance lenses on a light receiving side of the screen and exit lenses on a light emanating side of the same for transmitting light rays from the entrance lenses to the exit lenses, wherein the central portion of the entrance lens is so shaped as to have a focal point locating on or near the exit lens surface, and the side portions of the entrance lens are so shaped as to have a focal point or points remote from the entrance lens than the focal point for the central portion.

REFERENCES:
patent: 3523717 (1970-08-01), Glenn, Jr.
patent: 3830556 (1974-08-01), Bratkowski
patent: 4432010 (1984-02-01), Oguino
patent: 4490010 (1984-12-01), Honda et al.
patent: 4509823 (1985-04-01), Moriguchi et al.
patent: 4536056 (1985-08-01), Oguino
patent: 4752116 (1988-06-01), Sekiguchi

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