Optical: systems and elements – Projection screen – Curved
Patent
1994-02-14
1995-05-09
Wintercorn, Richard A.
Optical: systems and elements
Projection screen
Curved
359443, 359459, G03B 2156
Patent
active
054145589
ABSTRACT:
A screen is used for a projector and includes a metal plate body and a plurality of elongated parallel streaks. The metal plate body has a concave reflection surface which is horizontally straight and vertically curved and which has a predetermined radius of curvature. The streaks protrude uniformly and densely from the reflection surface of the metal plate body and extend from the top end of the reflection surface to the bottom end of the reflection surface in a generally vertical direction. Any adjacent pair of the streaks are sized and spaced apart from each other at an interval of less than 5 microns so that the streaks function as a concave grating. The concave reflection surface is coated with a transparent film by immersing the metal plate body in a caustic solution so as to decrease interference from light sources other than the projector. Accordingly, when the screen is in use, the light emitted from the projector can form high contrast images on the concave reflection surface so as to provide a high image quality on the screen.
REFERENCES:
patent: 3314742 (1967-04-01), Morgan
patent: 3754811 (1973-08-01), Hoadley et al.
patent: 3754813 (1973-08-01), Depalma et al.
patent: 3964822 (1976-06-01), Yamashita
patent: 4089587 (1978-05-01), Schudel
patent: 4232939 (1980-11-01), Kikuchi
patent: 4268118 (1981-05-01), Palmquist et al.
patent: 4732441 (1988-03-01), Cheng
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