Lens arrangements for microfiche reader assembly and method

Details Lens arrangements for microfiche reader assembly and method Lens arrangements for microfiche reader assembly and method

1980-03-04

1982-07-13

Haroian, Harry N.

Optics: image projectors

Selective data retrieval

Plural picture rows on single microcard

353101, G03B 2114, G03B 300

Patent

active

043391818

ABSTRACT:
A microfiche reader is disclosed herein and includes an assembly for supporting a microfiche in a given area, a projection screen and an optical arrangement for providing an image of a segment of the microfiche on the screen. This arrangement utilizes a dual projection lens assembly and a dual condenser lens assembly which cooperate with one another so that the magnification of the projected image can be easily varied between two levels. As disclosed, the dual projection lens assembly itself includes two distinct projection lenses which are contained in collapsible housings. Moreover, each of these latter lenses is adjustably focused by rotational movement of its associated housing and remains in the focusing position selected unless its housing is again rotated.

REFERENCES:
patent: 3809460 (1974-05-01), Lettan et al.
patent: 3811763 (1974-05-01), Cordonnier
patent: 4050799 (1977-09-01), Gross et al.
patent: 4067648 (1978-01-01), Spreitzer
patent: 4119372 (1978-10-01), Morgan
patent: 4170408 (1979-10-01), Behr
patent: 4215915 (1980-08-01), Freiberg

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