System and method for reducing scan line jitter in a laser scan unit for an imaging device

摘要

A system and method for reducing scan line jitter in laser scan systems employing a rotating mirror, including a controller for determining a unique time delay for each mirror facet and controlling laser sources so that video provided by each laser source is delayed in a scan line by the unique time delay corresponding to the mirror facet used in creating the scan line. The controller computes a facet map signature vector corresponding to each mirror facet matches the signature to a previously stored signature and assigns measured distance offset data to the mirror facets based upon the matching.

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; sensing circuitry for receiving at least one of the laser beams reflected by the facets of the rotating minor and for generating a corresponding horizontal synchronization signal in response to the reception; and a controller operably coupled to the rotating mirror, the laser sources and the optical sensor, and configured to
determine a facet map signature based upon the horizontal synchronization signal, the facet map signature comprising a vector of a size corresponding to a number of facets of the rotating minor;match, on a per facet basis, the determined facet map signature to a previously stored facet map signature; anddetermine a unique time delay for each facet of the rotating minor based upon the match, and control 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.