Distributed-optical microfiche reader

Details Distributed-optical microfiche reader Distributed-optical microfiche reader

1977-03-04

1979-01-16

Haroian, Harry N.

Optics: image projectors

Selective data retrieval

Plural picture rows on single microcard

353 38, G03B 2302, G03B 2106

Patent

active

041346505

ABSTRACT:
A reader for a distributed-optical microfiche wherein each page of recorded intelligence is constituted by a reduced scale image that is dissected to form a pattern of dispersed bits. The several patterns representing the recorded pages are interlaced to produce a multi-page microfiche that is read back by irradiating and enlarging only a selected pattern of dispersed bits and projecting this pattern onto a screen. The reader includes a lens matrix formed by an array of individual lenslets, each optically aligned with a respective bit in the selected pattern to enlarge and project this bit onto a screen zone. Interposed between the lens matrix and the screen is an apertured melding mask having an array of openings corresponding to the array of lenslets and optically aligned therewith. The diameter of each mask opening relative to that of the associated lenslet aperture and the distance between the mask opening and the lenslet are such that the illuminated screen zones associated with each triad of directly adjacent lenslets are in overlapping relationship to produce substantially equal light intensities within the overlapping and non-overlapping regions therein, thereby uniformly illuminating the screen.

REFERENCES:
patent: 3712724 (1973-01-01), Pratt
patent: 3864034 (1975-02-01), Yevick

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