Dual mode correction of image distortion in a xerographic printi

Details Dual mode correction of image distortion in a xerographic printi Dual mode correction of image distortion in a xerographic printi

1991-03-19

1992-10-06

Braun, Fred L.

Photocopying

Contact printing

Light boxes

355 52, G03G 1500, G03G 2100

Patent

active

051536447

ABSTRACT:
Correction of image distortion in a reproduction machine due to vibrational or speed distortions in or between a moving photoreceptor and an imaging device projecting raster lines on the photoreceptor as it moves past the imaging device, utilizing in encoder for sensing the speed of the photoreceptor and also the relative vibrational motion between the photoreceptor and the imaging device and providing electrical signals to a signal separator separating the electrical signals into lower and higher frequency signals, and a servo motor for driving the photoreceptor and compensating for the lower frequency increases or decreases in the speed of the photoreceptor, the servo motor being driven by the separated lower frequency signals; and an optical system for pivoting the projected raster lines to compensate for the image distortions which are of the higher frequencies, the optical system being driven by the higher frequency signals from the signal separator.

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Xerox Disclosure Journal, vol. 15 No. 6, Nov./Dec. 1990, "Raster Output Scanner" Inventors: Joseph Iantuzzo and Thomas Robson pp. 455-461.

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