Variable magnification projecting device

Details Variable magnification projecting device Variable magnification projecting device

1987-04-14

1988-08-23

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 58, 355 60, G03B 2734, G03B 2740, G03B 2770

Patent

active

047664665

ABSTRACT:
Improvements in a variable magnification projecting device for use in electrophotographic copying machines or the like to overcome the objections encountered when the magnification is varied greatly, such as a great amount of shift of the projection lens which requires a prolonged period of time, and a large amount of shift of a mirror in an undesirable direction. Variations between the same-size magnification and enlarged magnifications are effected by shifting the projection lens and at least a mirror in the rear of the lens, while variations between the same-size magnification and reduced magnifications are made by shifting the projection lens and at least mirrors in front of the lens.

REFERENCES:
patent: 3507576 (1970-04-01), Linde
patent: 4334762 (1982-06-01), Landa
patent: 4422100 (1983-12-01), Duvall et al.
patent: 4453824 (1984-06-01), Miyake et al.
patent: 4571064 (1986-02-01), Hayashi et al.
patent: 4571065 (1986-02-01), Yasuda

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