Optics: image projectors – Cabinet encloses projector and one side of screen – Reflector between lamp and screen
Patent
1977-10-28
1980-04-29
Stephan, Steven L.
Optics: image projectors
Cabinet encloses projector and one side of screen
Reflector between lamp and screen
353 99, G03B 2128
Patent
active
042003660
ABSTRACT:
The invention provides a portable reader for reading, by way of a magnified image, microform material such as microfiche or microfilm. The reader has a support for the microform material and a light source to pass light through the material. A projection lens is provided to project an image of the material on to a screen and there is also a biocular magnifier lens through which an observer can view a magnified version of the image. A partial reflector is disposed in the light paths between the projection lens and the screen and between the screen and the biocular magnifier lens so that light travels from the projection lens to the screen via the partial reflector and from the screen to the biocular magnifier lens via the partial reflector. In a convenient arrangement light travelling from the projection lens is reflected by the partial reflector towards the screen, and light travelling from the screen is transmitted through the partial reflector to the biocular magnifier lens. On the other hand the arrangement may be reversed so that light from the projection lens is transmitted through the partial reflector to the screen while light from the screen is reflected by the partial reflector towards the biocular magnifier lens.
REFERENCES:
patent: 3561860 (1971-02-01), Rudolph
patent: 3567319 (1971-03-01), Gaston
patent: 3620592 (1971-11-01), Freeman
patent: 3692399 (1972-09-01), Stewart
patent: 3796484 (1974-03-01), Forster
Advertisement from "Melles" Griot Catalogue, pp. 82-83.
Advertisement from Optical Spectra Magazine, Dec. 1974, p. 48.
Pilkington P. E. Limited
Stephan Steven L.
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