Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1998-10-19
2000-09-19
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347116, B41J 247
Patent
active
061219924
ABSTRACT:
A single pass ROS system provides a plurality of latent images which may subsequently be developed in different colors. A method and apparatus is provided for aligning ROS units in a single pass printing system, so that each ROS unit is aligned along the process or X-axis. After this alignment, the images formed by each ROS unit will be in proper registration within the prescribed tolerances. A signal in a closed feedback loop regulates the angular velocity and phase of the rotating polygon mirror of the first ROS unit. The same signal is also the reference signal to the feedback loops of the other rotating polygon mirrors of the other ROS units to synchronize all of the rotating polygon mirrors. The position of the scan lines formed by their respective ROS units are fixed relative to one another and thus, lacking any other error sources, are registered in the process direction. A proportional integral derivative controller, the motor polygon assembly and a speed detector form the synchronization system for each ROS unit. The proportional integral derivative controller produces the synchronized signal for the MPA as a function of the proportional feedback signal, the integral feedback signal and the differential feedback signal. The speed detector in the feedback loop has an invertor, a feedback gain and a zero order hold to convert the velocity/phase signal from the MPA into a feedback signal. The feedback signal, a weighted summed feedback signal from a feedback adder from all the ROS units and a reference signal are input to the proportional integral derivative controller.
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patent: 5521739 (1996-05-01), Mirchandani
patent: 5892533 (1999-04-01), Tanimoto et al.
Le N.
Nguyen Lamson D.
Propp William
Xerox Corporation
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