Electrophotographic machine with control means responsive to set

Details Electrophotographic machine with control means responsive to set Electrophotographic machine with control means responsive to set

1990-12-04

1992-05-12

Grimley, A. T.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 55, 355243, G03B 2734

Patent

active

051132184

ABSTRACT:
Disclosed is a copying machine employing a uni-focus projection lens in which the lens and a mirror for changing the conjugates length are driven to move independently according to a set magnification ratio and the focal length of the lens. Either the lens or the mirror is moved by a stepping motor according to a set first magnification ratio and the focal length of the lens. Calculated from the travel of either the lens of the mirror is a second magnification ratio, and the other one of the mirror and the lens is moved according to the second magnification ratio. In another way, first the lens is moved according to the set magnification ratio and the focal length of the lens. Calculated from the travel of the lens is the theoretical conjugate length at the set magnification ratio, and the mirror is moved according to the theoretical conjugate length. In another way, first the mirror is moved according to the set magnification ratio and the focal length of the lens. Calculated from the travel of the mirror is the theoretical lens forward length at the set magnification ratio, and the lens is moved according to the theoretical lens forward length.

REFERENCES:
patent: Re32424 (1987-05-01), Takenaka et al.
patent: 4501490 (1985-02-01), Miyamoto et al.
patent: 4571061 (1986-02-01), Osanai et al.
patent: 4676631 (1987-04-01), Kosugi et al.
patent: 4922087 (1990-05-01), Nakajima et al.
patent: 4925736 (1991-10-01), Ikeda

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