Optics: image projectors – Selective data retrieval – Plural picture rows on single microcard
Patent
1979-08-03
1981-06-02
Stephan, Steven L.
Optics: image projectors
Selective data retrieval
Plural picture rows on single microcard
353 26R, 353 95, 353 78, G03B 2308, G03B 2111
Patent
active
042708508
ABSTRACT:
There is disclosed herein apparatus for positioning rows and columns of microimage frames imprinted on a cassetted filmstrip for projection and display. The filmstrip is longitudinally movable in incremental amounts through an elongated cassette passageway, the passageway having a transverse aperture for permitting projected light to pass through a selected portion of the filmstrip for enlarged and focused microimage display. The positioning apparatus includes a first transparent plate located in the path of projected light but spaced to one side of and away from the plane defined by the filmstrip as it traverses the passageway, a second transparent plate located in the path of projected light but spaced on the opposite side of and away from the filmstrip traversing plane, and an assembly operable prior to filmstrip movement through the cassette passageway for effecting separation of the first and second plates, the assembly also operable after a selected portion of the filmstrip has been moved into and stopped in the path of projected light for clamping the selected film-strip portion between the first and second plates in a film-strip focusing plane.
REFERENCES:
patent: Re22517 (1944-07-01), Hopkins
patent: 2110484 (1938-03-01), Hopkins
patent: 2610540 (1952-09-01), Beitz
patent: 3284923 (1966-11-01), Leslie
patent: 3739069 (1973-06-01), Sandmeier
patent: 3784295 (1974-01-01), Okano
patent: 3917389 (1975-11-01), Shoji
patent: 4087166 (1978-05-01), Rothbart
Lettvin Norman
Realist, Inc.
Stephan Steven L.
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