Rear projection apparatus

Details Rear projection apparatus Rear projection apparatus

1987-03-30

1988-02-16

Frankfort, Charles

Optics: image projectors

Cabinet encloses projector and one side of screen

350128, G03B 2160

Patent

active

047251344

ABSTRACT:
The present invention consists in a rear image projection apparatus having a transmissive screen of high efficiency and low moire disturbance. In particular, the screen comprises a Fresnel sheet having a Fresnel lens, a front sheet having a horizontally-diffusing lenticular lens and a light diffusing element, and if necessary, a third sheet, wherein at least one surface of the Fresnel sheet or the third sheet is formed with a vertically-diffusing lenticular lens, and a pitch of the Fresnel lens is set to be at most 150% of an effective diffusion width of the diffusion element.

REFERENCES:
patent: 2525596 (1950-10-01), Finn
patent: 3893748 (1975-07-01), De Palma et al.
patent: 4054907 (1977-10-01), Itoh et al.
patent: 4432010 (1984-02-01), Oguino
patent: 4512631 (1985-04-01), Van Breemen
patent: 4531812 (1985-07-01), Oguino

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