Projection screen masking system

Details Projection screen masking system Projection screen masking system

1994-07-27

1996-06-04

Gray, David M.

Optical: systems and elements

Projection screen

Border, mask, shade, or curtain

355 74, G03B 3700

Patent

active

055238807

ABSTRACT:
A masking apparatus for masking portions of the viewing surface of a projection screen. The masking apparatus includes an upper roller, upon which is wound an upper masking screen, and a lower roller, upon which is wound a lower masking screen operatively connected to the upper roller. When the upper roller is rotated in a first direction, the upper masking screen is unwound and lowered to mask the upper region of the screen and the lower masking screen is unwound and raised to mask the lower region of the screen. When the upper roller is rotated in an opposite second direction, the upper and lower masking screens are wound to non-masking alignments. In an alternate embodiment, the masking apparatus can be used to mask side regions of a projection screen viewing surface.

REFERENCES:
patent: 1857368 (1932-05-01), Flynn et al.
patent: 1857673 (1932-05-01), Vallen
patent: 1882828 (1932-10-01), Hall et al.
patent: 2737081 (1956-03-01), Dowling
patent: 3016790 (1962-01-01), Nakamatsu
patent: 3475086 (1969-10-01), Vetter
patent: 4312568 (1982-01-01), Weinberg
patent: 4754308 (1988-06-01), Ozawa
patent: 4915496 (1990-04-01), Stine
patent: 5121977 (1992-06-01), Weisgerber

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