Projection screen

Details Projection screen Projection screen

1975-07-18

1976-11-30

Wintercorn, Richard A.

Chemistry: electrical and wave energy

Apparatus

Coating, forming or etching by sputtering

82 14R, 204 4, G03B 2160, B22D 11126, B23B 328

Patent

active

039945626

ABSTRACT:
A screen with characteristics of high brightness, controlled viewing angles, and ability to reject ambient light in which the longitudinal grooves formed therein are shaped so that the width and depth of each groove varies continuously along the length of the groove in a repeating sequence. The variation may take the form of a sine wave or be cuspoidal in shape.
A method of producing the screen uses a rotating roller in which desired grooves are cut. After the drum is cut with a series of grooves, a molding material is placed around the drum and baked. After removing the molding material from the drum, it is turned inside out and copied. This copy is again copied and its result is electroformed and thus serves as a master roller for the screen of the present invention.

REFERENCES:
patent: 2804801 (1957-09-01), Mihalakis
patent: 2984152 (1961-05-01), Mihalakis
patent: 3809457 (1974-05-01), Kurtz et al.

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