Variable magnification copying optical system

Details Variable magnification copying optical system Variable magnification copying optical system

1985-11-08

1987-06-30

Wintercorn, Richard A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

G03B 2734, G03B 2740

Patent

active

046766324

ABSTRACT:
A variable magnification copying optical system for projecting an image of an object, disposed on an object surface, to a focal plane and for varying a magnification of the image with respect to the object. The optical system includes a zoom lens movable to a plurality of positions for obtaining a first range of magnification values and a second lens for obtaining a further magnification value outside of the first range. To obtain the further magnification, the second lens is effectively moved into the optical projection path by moving the lens itself, changing the projection path, e.g., by a suitable shutter, or a combination of these steps. The second lens can provide the further magnification either alone or in combination with the zoom lens.

REFERENCES:
patent: 3779642 (1973-12-01), Ogawa et al.
patent: 4218133 (1980-08-01), Biedermann
patent: 4397544 (1983-08-01), Yajima et al.

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