Patent ID: 9229406
Filing Date: 2016-01-05
CPC Classification: G03G

Claim Text:
1. A method for compensating for imaging defects in an electro-photographic imaging system, the method comprising the steps of: (a) providing one or more imaging elements that rotates while printing; (b) determining positions on the one or more imaging elements using a period sensor for each imaging element while printing an image of known target density; (c) measuring the image density; (d) determining a two dimensional map of the density for each period sensor; wherein each of the imaging maps corresponds to positions on the one or more imaging elements; (e) comparing the printed density at each of the positions of the imaging maps to the known target density for determining an error signal; (f) determining a variation correction signal for each period sensors based on the error signal; (g) applying all the variation correction signals synchronized to the positions of each period sensor when printing subsequent prints to improve image uniformity; and wherein two or more imaging elements are rotationally synchronized.