Magnification adjusting mechanism

Details Magnification adjusting mechanism Magnification adjusting mechanism

1991-10-02

1992-08-11

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 57, 355243, G03B 2752, G03B 2734, G03B 2740

Patent

active

051383691

ABSTRACT:
In a magnification adjusting mechanism, preparatory movement position calculating means utilizes a current position where an optical system is positioned at present, and a target position for the optical system which corresponds to an aimed magnification inputted by a magnification inputting means, to calculate a preparatory movement position between the current position and said target position, and optical system drive control means controls optical system driving means in such a manner that, when a magnification is inputted by the magnification inputting means, the optical system is moved to a preparatory movement position calculated by the preparatory movement position calculating means, and that, when a final magnification is determined, the optical system is moved to the target position, whereby even when a magnification is set again because it is unacceptable, the optical system is quickly moved to the destination.

REFERENCES:
patent: 4917460 (1990-04-01), Yamada et al.
patent: 4954863 (1990-09-01), Harada et al.

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