Variable magnification copying apparatus

Details Variable magnification copying apparatus Variable magnification copying apparatus

1981-11-02

1983-02-22

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 8, 355 60, G03B 2734, G03B 2740, G03B 2770

Patent

active

043746195

ABSTRACT:
An optical system is provided for a copying apparatus which includes a plurality of components whose displacements relative to each other can be made to yield differing magnification at an imaging plane. In particular, during a magnification mode a dual rate scanning mirror pair is displaced a fixed distance and a catadioptric lens is displaced an identical distance, from their normal 1x positions. A third mirror, located at the photoreceptor plane is displaced a second distance. The displacements are a function of the magnification, the lens focal length and the angular displacement of the lens. All displacements are parallel to the document plane, resulting in a compact scanning system.

REFERENCES:
patent: 3476478 (1969-11-01), Rees, Jr.
patent: 3542467 (1970-11-01), Ferguson et al.
patent: 3614222 (1974-10-01), Post et al.
patent: 3731915 (1973-05-01), Guenther
patent: 3832057 (1974-08-01), Shogren
patent: 3837743 (1974-09-01), Amemiya
patent: 3884574 (1975-05-01), Doi et al.
patent: 4013361 (1977-03-01), Allis
patent: 4295736 (1981-10-01), Ikeda
patent: 4335953 (1982-06-01), Tsuchiya et al.

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