Optics: image projectors – Selective data retrieval – Plural picture rows on single microcard
Patent
1975-10-29
1979-01-30
Stephan, Steven L.
Optics: image projectors
Selective data retrieval
Plural picture rows on single microcard
353 8, G03B 2308, G03B 2128
Patent
active
041369378
ABSTRACT:
A microfiche reader with a compact housing having an upper housing portion or hood and a lower housing portion or base, has an upper surface which supports a fiche carrier in a projection plane. The hood has a lower surface spaced above the base to provide a work area for manipulation of the microfiche carrier. To further minimize size and overheating of the microfiche, a light source, condensing lens and mirror form a preassembled module which is located in the hood beneath and behind the projection screen and above the film plane. The projection lens and focus adjustment are carried by a slide or drawer which is movable between a position in registry with the light beam during use to a withdrawn position for easy access for changing lenses. The use of the light source module in the hood and the projection lens in the base enables the use of various size screen hoods on the same base without changing mirror angles in the base. Location of the light source in the hood also facilitates cooling of the lamp which affords considerably longer lamp life than in prior art readers. The reader also includes a carriage arrangement for guided movement of the microfiche and the transparent fiche carrier plates along first and second transverse axes which facilitates orientation and location of the selected images and maintains a proper squared relationship of the selected image on the screen. The carriage is easily removed from the reader without using any tools.
REFERENCES:
patent: 2746344 (1956-05-01), Pratt et al.
patent: 2933978 (1960-04-01), Rosenthal
patent: 3442581 (1969-05-01), Smitzer et al.
patent: 3733121 (1973-05-01), Smitzer
patent: 3743399 (1973-07-01), Smith
Data View, Inc.
Stephan Steven L.
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