Patent ID: 9141062
Filing Date: 2015-09-22
Classification: G03G

Abstract:
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 density image at one cross-track location; (d) determining a one dimensional map of the in-track 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 sensor based on the error signal; and (g) applying all the variation correction signals synchronized to the positions of each period sensor when printing subsequent prints to improve image uniformity.