Reader for microfiches with a display for image-field coordinate

Details Reader for microfiches with a display for image-field coordinate Reader for microfiches with a display for image-field coordinate

1982-03-24

1984-01-03

Haroian, Harry N.

Optics: image projectors

Selective data retrieval

Plural picture rows on single microcard

G03B 2308

Patent

active

044239335

ABSTRACT:
A microfilm reader having a film stage which is displaceable in two coordinate directions for moving a microfiche supported thereon through an optical path defined by a projection lamp and an optical system which projects an image of the microimages arranged in rows and columns on the microfiche onto a ground glass screen via a plurality of reflecting mirrors. The microfilm reader comprises in combination on the ground glass screen or on the housing adjacent to the ground glass screen a first scale corresponding to the microimage rows and a second scale corresponding to the microimage columns, a movable first marking in combination with the first scale and a second marking in combination with the second scale, these markings being coupled with the displacement means of the film stage to indicate the row and the column of the microimage presently projected onto the ground glass screen.

REFERENCES:
patent: 2735334 (1956-02-01), Emery et al.
patent: 3296521 (1967-01-01), Wildberger
patent: 3319518 (1967-05-01), Carlson
patent: 3786417 (1974-01-01), Carlson
patent: 3797925 (1974-03-01), Smitzer
patent: 3799663 (1974-03-01), Barre et al.
patent: 3807846 (1974-04-01), Swank
patent: 4311370 (1982-01-01), Poehler

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