Optics: image projectors – Selective data retrieval – Plural picture rows on single microcard
Patent
1977-11-09
1980-01-29
Stephan, Steven L.
Optics: image projectors
Selective data retrieval
Plural picture rows on single microcard
350127, 353 78, 353 81, G03B 2160, G03B 2308, G03B 2128
Patent
active
041859014
ABSTRACT:
A reading device for viewing microfilms, transparencies, fiches, and the like, comprising a plate-shaped projection screen made of transparent material supported on a frame structure with the projection screen disposed in a slanted position relative to the horizontal. The screen has on the viewing side a frosted surface and on the opposite side prism-shaped parts. A source of light is disposed into the frame structure beneath a carrier for placing an article to be projected thereon. A mirror assembly is disposed in the frame structure to reflect light rays passed from the light source through the article to the prism-shaped parts and through the projection screen. The prism-shaped parts are disposed in lengthwise rows and have prism surfaces extending at an angle with respect to the opposite side of the projection screen for deflecting the light rays reflected from the mirror assembly so as to project an image of the article within an angle converging toward a viewer situated above and in front of the screen. The prism surfaces progressively increase from the lower end of the screen through the upper end of the screen to provide substantially uniform illumination.
REFERENCES:
patent: 2934998 (1960-05-01), Beard
patent: 3319517 (1967-05-01), Rondas
Minox GmbH
Stephan Steven L.
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