Variable magnification copying apparatus

Details Variable magnification copying apparatus Variable magnification copying apparatus

1987-09-24

1990-01-16

Hix, L. T.

Photocopying

Projection printing and copying cameras

Focus or magnification control

355 67, 355 71, G03B 2752, G03B 2771

Patent

active

048946826

ABSTRACT:
A variable magnification image forming apparatus includes a photosensitive member, a light source, projecting device for forming and projecting on the photosensitive member an image of the original illuminated by the light source, the projecting device including lens system movable in accordance with a magnification of projection selected, a first limiting member for limiting light rays disposed with a fixed positional relation with respect to the lens system, and a second limiting member for limiting light rays in the lens system, the second limiting member being displaceable in a direction different from a direction of an optical axis of the lens system in accordance with magnification change to change the positional relation with respect to the first limiting member.

REFERENCES:
patent: 3970366 (1976-07-01), Sekiguchi
patent: 4432615 (1984-02-01), Ikemori
patent: 4459016 (1984-07-01), Takuhara et al.
patent: 4473278 (1984-09-01), Hama
patent: 4586814 (1986-05-01), Tokuhara et al.
patent: 4717939 (1988-01-01), Yanagawa

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