Copying magnification setting device for an electrophotographic

Details Copying magnification setting device for an electrophotographic Copying magnification setting device for an electrophotographic

1986-11-24

1991-06-11

Braun, Fred L.

Photocopying

Contact printing

Light boxes

355 55, G03G 1504

Patent

active

050236636

ABSTRACT:
An image forming apparatus that is capable of providing various copy ratios includes an original table that can receive an original document from an image carrier. The original is then illuminated, and a focusing lens system is capable of focusing reflected light from the original document onto a photosensitive member. The focusing lens system is movable. A drive assembly can cause relative movement of the original and a light system for illuminating the original, while a second drive member can vary the distance from the original to the focusing lens system whereby the image stays within the fixed focal length of the optical system while accommodating the speed necessary for a specified copy ratio.

REFERENCES:
patent: 4209248 (1980-06-01), Gibson et al.
patent: 4436416 (1984-03-01), Negoro et al.
patent: 4441805 (1984-04-01), Smith
patent: 4459010 (1984-07-01), Hinton et al.
patent: 4498759 (1985-02-01), Ogawa et al.
patent: 4501490 (1985-02-01), Miyamoto et al.

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