Optical and focusing arrangement for microfiche reader

Details Optical and focusing arrangement for microfiche reader Optical and focusing arrangement for microfiche reader

1982-04-16

1983-10-18

Marcus, Stephen

Optics: image projectors

Selective data retrieval

Plural picture rows on single microcard

353 76, 353101, 350247, G03B 2308

Patent

active

044102488

ABSTRACT:
The microfiche reader has two lenses carried by a segment mounted on an eccentric pivot which can be adjusted to move the pivot and, therefore, the lenses are in an eliptical orbit which permits the lens in the operative position to be centered on the optical path. When the segment is shifted to move the other lens into position that lens will be centered. Each lens is focused by moving the associated focusing slide in and out to move the parallel cams under the bosses carried by the lens barrel flange to raise and lower the lens to focus the image. The image is centered on the screen by adjusting the first mirror which is mounted on a bracket which pivots on a housing partition and has a wedge between the bracket and the partition. The bracket has teeth which engage serrations on the wedge so when the retaining screw is tightened the wedge is locked in place.

REFERENCES:
patent: 2194384 (1940-03-01), Dewey
patent: 2558982 (1951-07-01), Pratt et al.
patent: 3597064 (1971-08-01), Caraway
patent: 3792923 (1974-02-01), Pfeifer et al.
patent: 3893135 (1975-07-01), Matsui et al.
patent: 4067648 (1978-01-01), Spreitzer
patent: 4119983 (1978-10-01), Tanaka
patent: 4314745 (1982-02-01), Freiberg

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