Optics: image projectors – Cabinet encloses projector and one side of screen – Reflector between lamp and screen
Patent
1980-03-24
1982-07-13
Stephan, Steven L.
Optics: image projectors
Cabinet encloses projector and one side of screen
Reflector between lamp and screen
350129, 353 27R, G02B 308, G03B 2122, G03B 2160
Patent
active
043391834
ABSTRACT:
This invention presents a film reader equipped with a reflecting type screen, which is arranged in a housing of the reader and has a number of ring strip surfaces having different inclination angles and arranged concentrically. The common center of the ring strip surfaces is deviated from the center of the screen and locates outside of the screen and the end of the screen nearest to the common center is placed near to an observing aperture in the housing. A light source for illuminating a microfilm having recorded images and an optical system for projecting the image of the illuminated film to the screen are provided. Further, the screen is formed by one synthetic resin or preferably at least two kinds of synthetic resins having different refractive indices and mutually non-soluble property. A reflecting substance may be mixed with said resins.
REFERENCES:
patent: 1535985 (1925-04-01), Clark
patent: 2934998 (1960-05-01), Beard
patent: 3718078 (1973-02-01), Plummer
patent: 3997258 (1976-12-01), Omi
patent: 4206969 (1980-06-01), Cobb et al.
patent: 4229085 (1980-10-01), Yamada et al.
Arai Toshio
Inoue Mutsuhiro
Kuwayama Tetsuro
Omi Kokichi
Suzuki Hiroaki
Canon Kabushiki Kaisha
Stephan Steven L.
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