Title:
【発明の名称】複写用変倍レンズ系
Document Type and Number:
Japanese Patent JP2562636
Kind Code:
B2
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.
Inventors:
ICHIKI AIKO
HIRANO NAGAYOSHI
HIRANO NAGAYOSHI
Application Number:
JP33137887A
Publication Date:
December 11, 1996
Filing Date:
December 25, 1987
Export Citation:
Assignee:
FUJI PHOTO OPTICAL CO LTD
International Classes:
G02B13/24; G02B9/62; G02B15/16; G02B15/20; (IPC1-7): G02B13/24; G02B15/20
Domestic Patent References:
| JP4922976A | ||||
| JP4942335A | ||||
| JP59125719A | ||||
| JP6143713A |