Projection screen device

Details Projection screen device Projection screen device

1990-06-13

1992-07-07

Wintercorn, Richard A.

Optical: systems and elements

Projection screen

G03B 2156

Patent

active

051277220

ABSTRACT:
There is disclosed a projection screen device having a high luminance adapted for use in an overhead projector, a video projector or a liquid crystal projector. The projection screen device comprises a flexible screen film and an endless circumfernetial frame tube (hereinafter referred to as frame tube) having at least a flexible characteristic and being tightly connected with an entire circumferential edge of the screen film, the frame tube being expanded by introduction of fluid under pressure so that the screen film is stretched under tension across the frame tube. The screen film comprises a reflection film and a lens film formed in front of the reflection film for reflecting an incident light, the lens film composed of a first group of lenses for expanding the reflected light both rightward and leftward and a second group of lenses for collecting vertical reflected light horizontally, the lens film being subjected to a minute mat on the entire surface thereof.

REFERENCES:
patent: 3720455 (1973-03-01), Sahlin
patent: 4022522 (1977-05-01), Rain
patent: 4323301 (1982-04-01), Spector
patent: 4339175 (1982-07-01), Astero 350117

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