Optical device for varying magification

Details Optical device for varying magification Optical device for varying magification

1989-02-27

1990-12-04

Bovernick, Rodney B.

G02B 1515, G02B 2736

Patent

active

049749480

ABSTRACT:
An optical device for varying magnification, having an object plane on which an object is to be located, a light receiving surface, and an imaging lens unit for focusing an image of the object located on the object plane onto the light receiving surface, so that upon varying the magnification, an optical distance between the object plane and the light receiving surface can be changed, wherein the imaging lens unit includes a main lens group and a correcting lens group that are movable relative to each other, the main lens group or the correcting lens group being fixed with respect to the light receiving surface, the correcting lens group or the main lens group being movable to the object plane and the light receiving surface to vary the magification.

REFERENCES:
patent: 4397544 (1983-08-01), Yajima et al.
patent: 4471237 (1984-05-01), Arai
patent: 4497573 (1985-02-01), Tokuhara et al.
patent: 4508434 (1985-04-01), Ogawa
patent: 4597641 (1986-07-01), Arai
patent: 4735496 (1988-04-01), Arai
An abstract of Japanese Unexamined Patent Publication No. 50-138823.
English language abstracts of Japanese Unexamined Patent Publication Nos. 59-488723 and 58-126512.

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