Optical: systems and elements – Projection screen – Unitary sheet comprising plural refracting areas
Patent
1997-07-28
2000-02-29
Gray, David M.
Optical: systems and elements
Projection screen
Unitary sheet comprising plural refracting areas
359457, 359460, G03B 2160
Patent
active
060316640
ABSTRACT:
A transmission type projection screen comprises a plurality of sheets. The front sheet nearest to the front observation side is an ambient light attenuating front sheet which is provided on its surface facing the rear side with first prism lenses formed by successively and horizontally arranging unit triangular prisms. Each unit triangular prism has a sharply inclined surface inclined at an angle of about 90.degree. to the surface of the front sheet, and a gently inclined surface inclined at an angle in the range of 5.degree. to 40.degree. to the surface of the front sheet. The first prism lenses are disposed with the gently inclined surfaces of the unit triangular prisms thereof facing upward. Second prism lenses may be provided on its surface facing the front observation side, each of the second prism lenses also having a sharply inclined surface and a gently inclined surface.
REFERENCES:
patent: 4185901 (1980-01-01), Behr
patent: 4473277 (1984-09-01), Brown
patent: 4512631 (1985-04-01), VanBreemen
patent: 5513036 (1996-04-01), Watanabe et al.
patent: 5703722 (1997-12-01), Blankenbecler
patent: 5774260 (1998-06-01), Petitto et al.
Dai Nippon Printing Co. Ltd.
Gray David M.
Mahoney Christopher E.
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