Patent ID: 7126621
Filing Date: 2006-10-24
Classification: G03G

Abstract:
1. An imaging device for producing multicolor images from image data containing data representing an image of a first color and an image of a second color to be registered relative to the image of the first color onto a substrate by transferring toner of the first and second colors to the substrate, the imaging device comprising: a first imager configured to generate an optical output corresponding to the image of the first color at a first exposure station, a second imager configured to generate an optical output corresponding to the image of the second color at a second exposure station; a photoreceptor belt configured to have a charge placed thereon for modification by the optical output of the first imager to be receptive to a charged toner of the first color and for modification by the optical output of the second imager to be receptive to a charged toner of the second color, the photoreceptor belt being configured to include an index; a plurality of rollers mounted to a frame of the imaging device for defining a process path along which the photoreceptor belt is driven in a process direction, the plurality of rollers comprising: an angular position sensor for detecting the phase angle of the drive roller from the reference point; a first index sensor mounted along the process path for sensing the passage of the index on the belt; a second index sensor mounted along the process path for sensing the passage of the index on the belt; an image data source for generating image data for generating an image including graphics of the first color and graphics of the second color, the image data including a line to be printed in the first color and in the second color; a controller coupled to receive signals from the first index sensor, second index sensor, angular position sensor, first imager and image data source and configured to drive the second imager to generate an optical output, the controller including memory for storing the eccentricity versus phase angle from a reference point data, the time at which the first index sensor senses the passage of the index on the belt, and the time at which the second index sensor senses the passage of the index on the belt and a processor for calculating an appropriate time delay for starting the generation of the optical output of the second imager for printing the line to be printed in the first color and in the second color based on the time of the starting of the generation of the optical output by the first imager to print the line to be generated in the first color and in the second color, the signal received from the first index sensor, the signal received from the second index sensor, the signal received from the angular position sensor, and the eccentricity versus phase angle from a reference point data.