Reflection-type projection screen

Details Reflection-type projection screen Reflection-type projection screen

1997-02-26

2000-11-07

Adams, Russell

Optical: systems and elements

Projection screen

Embedded particles

359459, G03B 2160

Patent

active

06144491&

ABSTRACT:
A reflection-type projection screen includes a substrate, a light-reflecting layer made from a transparent resin in which flakes of a light-reflective material are dispersed, and a transparent light-diffusing layer made from a transparent resin in which fine crystalline particles of calcite and an achromatic dye or pigment are dispersed. The surface of the light-diffusing layer functions as a projection-light-receiving, image-observation surface which receives the incident projection light and on which an image to be observed is formed. A lubricant can be incorporated into the light-diffusing layer. The calcite particles slightly absorb light and have moderate light-diffusing properties. As a result, the transmittance of the light-diffusing layer is increased. The light-reflecting layer has a high reflectance. Due to the synergistic effect of the properties of the two layers, the projection screen has a high reflection luminance (high gain). Furthermore, due to the light-diffusing effect of the calcite particles and the flakes, a wide angle of visibility can be obtained.

REFERENCES:
patent: 4006965 (1977-02-01), Takada et al.
patent: 4431720 (1984-02-01), Sugarman
patent: 4519686 (1985-05-01), Seki et al.
patent: 4911529 (1990-03-01), Van De Ven
patent: 5196960 (1993-03-01), Matsuzaki et al.
patent: 5361163 (1994-11-01), Matsuda et al.
patent: 5456967 (1995-10-01), Nezu

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