METHOD OF ELIMINATING MAGNIFICATION ERRORS
Original Publication Date: 1989-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Xerox Disclosure Journal
In an electrophotographic printing machine utilizing a servo motor driven document scanning system to expose the photoconductive drum, the velocity of the electrophotographic system is controlled by a synchronous motor. The speed of the motor is AC line frequency dependent, while the control of the scan carriage speed is dependent on an internal crystal clock frequency. The capabilities of such a system may also include reduction and enlargement performed by varying the scan carriage velocity. Such a system would likely have scan velocities derived around an assumed nominal line frequency, typically 50 or 60 Hz.