Back projection viewing screen

Details Back projection viewing screen Back projection viewing screen

1976-12-23

1979-04-03

Hayes, Monroe H.

Optics: motion pictures

Removable film strip magazine type

352104, 352130, G03B 2160

Patent

active

041474082

ABSTRACT:
A back projection viewing screen comprising two parallel transparent sheets of plastic, each having its faces optically configured. The surfaces have the following characteristics arranged in the order from the projection side to the viewing side: (1) an ordinary circular Fresnel lens to which a light frosted texture has been applied; (2) a series of parallel vertical convex circular lenticulations joined by sharply defined cusps; (3) a series of parallel vertical convex lenticulations joined by sharp cusps and having an elliptical cross-section. The lenticulations on this third surface have a very different periodicity from that of the second surface to avoid the possibility of moire patterns; (4) the viewing surface of the screen is defined by a series of parallel horizontal convex lenticulations, each having a convex elliptical cross-section.

REFERENCES:
patent: 1984004 (1934-12-01), Wildhaber
patent: 3848980 (1974-11-01), Plummer
patent: 3893748 (1975-07-01), DePalma

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