Magnetic indexing system for microfilm reader

Details Magnetic indexing system for microfilm reader Magnetic indexing system for microfilm reader

1979-04-26

1981-01-27

Haroian, Harry N.

Optics: image projectors

Selective data retrieval

Plural picture rows on single microcard

G03B 2308

Patent

active

042471842

ABSTRACT:
A microfilm reader with a projection system through which individual images on a piece of microfiche can be projected through a viewing screen. The reader has a base structure on which is mounted a carriage assembly which holds the microfilm and is mounted for horizontal movement relative to the base structure. A series of magnets mounted on the carriage assembly and base structure causes the carriage assembly to be magnetically held in predetermined positions. In one embodiment the predetermined magnetically held positions are identical to the distances between the individual images on the microfiche whereby images from the microfiche can be precisely positioned on the screen without the operator viewing the image on the screen.

REFERENCES:
patent: 3868179 (1975-02-01), Zeutschel

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