Laser scan unit for an imaging device

摘要

A system and method for reducing scan line jitter caused by facet cut variation in scan systems employing a plurality of laser sources and a sensor for generating the timing for the laser sources. The system includes a controller for determining a unique time delay for each facet of the rotating mirror, and controlling the laser sources so that video provided by each laser source is delayed in a scan line by the unique time delay corresponding to the facet of the rotating mirror used in creating the scan line.

主权项

1. A laser scan unit for an imaging device, comprising:
a rotating mirror having a plurality of facets; a plurality of laser sources, each laser source positioned in proximity to the rotating mirror for generating a laser beam directed thereat; an optical sensor for receiving one of the laser beams reflected by the facets of the rotating minor and for generating a horizontal synchronization signal in response to the reception; and a controller operably coupled to the rotating mirror, the laser sources and the optical sensor, for determining a unique time delay for each facet of the rotating mirror, and controlling the laser sources so that video provided by each laser source is delayed in a scan line by the unique time delay corresponding to the facet of the rotating mirror used in creating the scan line; wherein the controller is configured to determine, for each facet of the rotating mirror, a facet offset value based upon an average time delay between successive assertions of the horizontal synchronization signal corresponding to the facet, and to delay transmission of video data by the laser sources by at least the facet offset value, the facet offset value comprising the unique time delay.