Variable magnification optical apparatus

Details Variable magnification optical apparatus Variable magnification optical apparatus

1982-08-26

1985-02-05

Gonzales, John

Photocopying

Projection printing and copying cameras

Focus or magnification control

350423, G03B 2736

Patent

active

044975732

ABSTRACT:
A variable magnification optical apparatus in which an image of an original can be formed on a photosensitive surface at selectively different magnifications. The amount of movement of a lens for changing the imaging magnification is corrected in accordance with the difference between the actual value and the nominal value of the focal length of the lens, namely, the error of the focal length of the lens.

REFERENCES:
patent: 3259009 (1966-07-01), Walter
patent: 3416860 (1968-12-01), Mihojevich et al.
patent: 3431053 (1969-03-01), Wick et al.
patent: 4077715 (1978-03-01), Greene
patent: 4155641 (1979-05-01), Sagara et al.
patent: 4264198 (1981-04-01), Miyamoto

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