Microfilm reader for microfiche films

Details Microfilm reader for microfiche films Microfilm reader for microfiche films

1988-05-06

1990-08-28

Haroian, Harry N.

Optics: image projectors

Selective data retrieval

Plural picture rows on single microcard

353101, 353 23, G03B 2308

Patent

active

049520520

ABSTRACT:
A microfilm reader comprises a microfiche moving mechanism for sandwiching a microfiche film between an upper glass plate and a lower glass plate and moving the film in two-dimensional directions, and a projecting optical system for projecting images recorded on the film to a screen. The projecting optical system includes a projecting lens housed in a lens case placed on the upper glass plate of the microfiche moving mechanism. This lens case is raised away from the upper glass plate when the microfiche moving mechanism is in motion. The upper glass plate is raised only when the microfiche moving mechanism is in a home position for inserting and removing the microfiche film to/from a position between the upper and lower glass plates.

REFERENCES:
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patent: 4283136 (1981-08-01), Swift et al.
patent: 4339182 (1982-07-01), Ueda et al.
patent: 4549797 (1985-10-01), Sawano et al.

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