Patent ID: 6121992
Filing Date: 2000-09-19
Classification: B41J,H04N

Abstract:
An imaging system for forming multiple image exposure frames on a photoconductive member during a single pass comprising:a plurality of Raster Output Scanners (ROS) units, each ROS unit associated with the formation of one of said multiple image exposure frames, each ROS unit forming a plurality of projected scan lines in a fast scan direction across the width of said photoconductive member, by reflecting modulated beams from multi-faceted surfaces of a rotating polygon associated with each one of said ROS units, each polygon being rotated by a separate drive motor,means for detecting the velocity and phase of said rotating polygon and providing a velocity/phase signal representing such detection, wherein said velocity/phase signal from a first ROS unit is the reference signal for said other ROS unitsmeans for generating a stable reference signal for the velocity and phase of said rotating polygon,means for comparing said velocity/phase signal and said reference signal and means for generating an output signal, andmeans for adjusting the velocity to each of said polygon motors in response to said output signal in a feedback loop whereby all of said polygon motors are synchronized in velocity and phase.