Variable magnification copier

Details Variable magnification copier Variable magnification copier

1988-08-24

1990-02-20

Hix, L. T.

Photocopying

Contact printing

Light boxes

355243, 355 57, G03G 1528

Patent

active

049030795

ABSTRACT:
A variable magnification scanning optical system for a copying machine includes a lens (10) for projecting an image of an original document (2) with a pre-selected magnification onto a moving imaging member (6). The scan speed may be varied relative to the speed of the imaging member to alter the magnification in the scan direction. To this end a reference signal is generated which is derived from the imaging member and is indicative of the nominal pre-selected magnification. A second signal is generated indicative of the scan speed and the scan speed is varied, e.g. by a servo system (see FIG. 2), until the second signal matches the reference signal. To compensate for tolerances between the nominal magnification and the actual magnification, the reference signal may be adjusted by applying an offset value (23) stored in the memory. This offset value may be entered into the memory by an operator via a keyboard panel (22). Also, compensation may be made independently for magnification tolerances in the cross-scan direction, again by the application of an offset value stored in a memory, to move the lens from its home position corresponding to nominal unity magnification to a new position corresponding to actual unity magnification.

REFERENCES:
patent: 3126809 (1964-03-01), Adams et al.
patent: 3861797 (1975-01-01), Nishida et al.
patent: 3967898 (1976-07-01), Klann
patent: 4111551 (1978-09-01), Klann
patent: 4391506 (1983-07-01), Koide
patent: 4543643 (1985-09-01), Shibazaki et al.
patent: 4593999 (1986-06-01), Adaichi et al.
patent: 4614423 (1986-09-01), Yoshiura
patent: 4657380 (1987-04-01), Hamano et al.

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