Optics: image projectors – Cabinet encloses projector and one side of screen – Light shield – mask – hood – or diaphragm
Patent
1978-03-08
1980-10-21
Stephan, Steven L.
Optics: image projectors
Cabinet encloses projector and one side of screen
Light shield, mask, hood, or diaphragm
350129, 353 77, G03B 2122, G03B 2160
Patent
active
042290856
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 located outside of the screen, and the end of the screen nearest to the common center is placed near 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 nonsoluble property. A reflecting substance may be mixed with said resins.
REFERENCES:
patent: 2726573 (1955-12-01), Maloff
patent: 2934998 (1960-05-01), Beard
patent: 3236150 (1966-02-01), Miller
patent: 3718078 (1973-02-01), Plummer
patent: 3781102 (1973-12-01), Chandler
patent: 3997258 (1976-12-01), Omi
Arai Toshio
Inoue Mutsuhiro
Kuwayama Tetsuro
Omi Kokichi
Suzuki Hiroaki
Canon Kabushiki Kaisha
Stephan Steven L.
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