Microform viewer

Details Microform viewer Microform viewer

1979-08-16

1982-05-04

Stephan, Steven L.

Optics: image projectors

Selective data retrieval

Plural picture rows on single microcard

350254, 350255, 350257, 353101, G03B 2308, G03B 2130, G02B 704

Patent

active

043279740

ABSTRACT:
A portable microform viewer provides a short film path through a film transporter that adjustably positions the film in two directions by means of a pair of concentric knobs. A pair of projecting lenses is shiftably mounted for selection of one or the other and the two are mounted on a common pivoted focusing plate. Film is positioned within the film transport by means of a pair of glass flats that are detachably mounted in the transport and flexibly connected to each other for accommodation of microform of different thickness and for ready removal and complete cleaning.

REFERENCES:
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patent: 3070389 (1962-12-01), Bant et al.
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patent: 3511149 (1970-05-01), Blattner et al.
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patent: 3814514 (1974-06-01), Douglas et al.
patent: 3838916 (1974-10-01), Gawin et al.
patent: 3899246 (1975-08-01), Edelstein
patent: 3917389 (1975-11-01), Shoji
patent: 3941467 (1976-03-01), Kapany et al.
patent: 4067648 (1978-01-01), Spreitzer

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