Variable power copying lens system

Details Variable power copying lens system Variable power copying lens system

1981-05-11

1982-11-16

Corbin, John K.

G02B 1500

Patent

active

043592694

ABSTRACT:
A variable power copying lens system having an intermediate range of variable magnification with superior distortion aberration compensation and compact size. The lens system includes, in order from the object side, a first lens group having a negative focal length, a second lens group having a positive focal length and a third lens group having a negative focal length. The distance between the first and second lens groups and the distance between the second and third lens groups is variable simultaneously with variation of the overall lens system position to thereby maintain the distance between the object surface and image surface constant.

REFERENCES:
patent: 3973831 (1976-08-01), Minoura
patent: 4037937 (1977-07-01), Minoura
patent: 4149774 (1979-04-01), Hirano et al.

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