Patent ID: 6137522
Filing Date: 2000-10-24
Classification: B41J,H04N

Abstract:
A raster imaging system for exposing a photoresponsive surface moving relative to the raster imaging system in a process direction, including:a multi-beam laser diode scanner forming a plurality of rasters across said surface, in a direction transverse to the process direction, by reflecting and modulating a plurality of beams so as to direct the beams to the photoresponsive surface;a controller to control the power from the multi-beam laser diode, said controller including, means to control, individually, an exposure level from each of a plurality of laser diodes by controlling the laser diode current,wherein a laser diode current is a sum of a plurality of individually controllable input currents, at least comprising:a prebias current,a bias level current and,an exposure level current,wherein the sum of the prebias current and the bias level current for one of a plurality of laser diodes is less than the current necessary to cause the respective laser diode to begin to laze.