Variable magnification duplicator lens system

Details Variable magnification duplicator lens system Variable magnification duplicator lens system

1988-12-23

1990-03-13

Sugarman, Scott J.

350464, G02B 1500, G02B 962

Patent

active

049078658

ABSTRACT:
A variable scale duplicator lens system, including: front and rear lens group each consisting of three lenses and located on the opposite sides of a stop, the front group on the side of the subject and the rear group on the image-forming side; the front group on the subject side including a 1st lens consisting of a meniscus lens of positive power facing the convex side thereof toward the subject, a 2nd lens consisting of a meniscus lens having negative power facing the convex side thereof toward the subject, and a 3rd lens of positive power; the rear lens group including 4th to 6th lenses arranged symmetrically with the 1st to 3rd lenses of the front lens group, respectively. Of these six lens members, at least one of the 1st and 6th lenses is movable. When the lens system as a whole is shifted along the optical axis for magnification of copy scale, the lens position is adjusted at least by shifting the 6th lens toward the 5th lens or by shifting the 1st lens away from the 2nd lens in case of reduction of copy scale, and the lens position is adjusted at least by shifting the 1st lens toward the 2nd lens or by shifting the 6th lens away from the 5th lens in case of enlargement of copy scale.

REFERENCES:
patent: 3728010 (1973-04-01), Mikami
patent: 3865470 (1975-02-01), McCrobie et al.
patent: 3905685 (1975-09-01), Harper et al.
patent: 3912374 (1975-10-01), Liu
patent: 3973831 (1976-08-01), Minoura
patent: 4061419 (1977-12-01), Price et al.
patent: 4735496 (1988-04-01), Arai

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