Photocopying – Projection printing and copying cameras – Focus or magnification control
Patent
1982-05-12
1984-10-02
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Focus or magnification control
35419512, G03B 2734, G03B 2740
Patent
active
044744617
ABSTRACT:
A copying apparatus capable of varying the imaging magnification of the image of an original projected upon a photosensitive medium has an imaging optical system for forming the image of the orignal on the photosensitive medium, and a member for supporting the imaging optical system. The imaging optical system is provided with a plurality of optical elements. At least one magnification changing optical element of the optical elements is capable of changing its position relative to the other optical elements to vary the focal length of the imaging optical system. The member for supporting the imaging optical system includes a first device capable of moving at least one of the magnification changing optical elements by a minute amount in the direction of the optical axis, and a second device for moving the magnification changing optical elements by a predetermined amount to vary the focal length of the imaging optical system.
REFERENCES:
patent: 3277783 (1966-10-01), Eggert
patent: 3436145 (1969-04-01), Bechtold
patent: 3625595 (1971-12-01), Fleishman
patent: 3850507 (1974-11-01), Uesugi
Canon Kabushiki Kaisha
Wintercorn Richard A.
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