Cross scan beam positioner for multiple channel laser ros

Details Cross scan beam positioner for multiple channel laser ros Cross scan beam positioner for multiple channel laser ros

G - Physics

02

B

314/28

G02B 26/10 (2006.01) G01D 9/42 (2006.01) G02F 1/315 (2006.01) G06K 15/12 (2006.01)

Patent

CA 1229367

-1- ABSTRACT A multi-channel laser ROS scanner for simultaneously scanning laser beam components across multiple lines of a photosensitive surface including appratus for determining deviations in the position of the surface from a desired position due to undesired photosensitive surface velocity variations whereby an error correction signal can be generated, and a TIR modulator having a plurality of interdigitated, addressable drive electrodes. The total number of drive electrodes Nt of the TIR modulator is greater than the collective number of drive electrodes Ns needed to provide the desired pixel resolution for all of the simultaneously scanned lines. When the photosensitive surface is maintained at a desired velocity, such velocity being determined in a conventional manner by system parameters, the surface is correctly positioned and Ns adjacent drive electrodes located generally centrally within the TIR electrode configuration are addressed by the video data signals for the multiple scan lines, causing the laser beam components to exit the TIR modulator with an unshifted or "normal" propagation direction within the optical window of the modulator resulting in scan lines being recorded at desired positions on the photoreceptive surface. Should the photosensitive surface deviate from its desired position at a given time, the error signal functions to cause Ns different adjacent drive electrodes to be addressed whereby the laser beam components exiting the TIR modulator are shifted in propagation direction such that they strike the photosensitive surface at a placement which corrects for the position deviation.

466699

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