Copying zoom lens system

Details Copying zoom lens system Copying zoom lens system

1994-12-16

1997-02-04

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359689, G02B 1514

Patent

active

056004893

ABSTRACT:
A copying zoom lens system is provided with from the original side a first lens unit of negative refractive power including at least one negative lens element, a second lens unit of positive refractive power including at least four lens elements, and a third lens unit of negative refractive power including at least one negative lens element. The second lens unit is asymmetric with respect to the center of the lens units of the lens system. During zooming, the projection magnification is varied with the conjugate distance being maintained constant by varying the distance between the first and second lens units and the distance between the second and third lens units and by moving the entire lens system. The axial distances among the lens units are defined by predetermined conditions.

REFERENCES:
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patent: 4787718 (1988-11-01), Cho
patent: 4813773 (1989-03-01), Minefuji
patent: 4955700 (1990-09-01), Yamaguchi
patent: 5270864 (1993-12-01), Watanabe
patent: 5315441 (1994-05-01), Hori et al.
patent: 5345338 (1994-09-01), Ueda et al.
patent: 5461512 (1995-10-01), Ruben

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