Patent ID: 6834932
Filing Date: 2004-12-28
Classification: B41J,G06K

Abstract:
In an ink ejection print head comprising a plurality of overlapping print head segments, at least one temperature sensor for measurement of the temperature of adjacent print head segments in order to determine the degree of overlap between adjacent print head segments; means for providing a half toning of a continuous tone image and means for adjusting said half toning means in a region of overlap between adjacent print head segments to reduce artifacts between said adjacent segments, said region of overlap extending the length of a plurality of ink ejection nozzles and wherein the spatial relationship between adjacent segments is variable with time, a method for controlling the firing of said nozzles within the overlapped segments comprising the steps of: (a) determining a measure of the overlap between adjacent print head segments; (b) creating a half toning pattern for the nozzles in the region of overlap of the overlapping segments; and (c) adjusting said half toning pattern as a function of said measure in the overlapping regions of said print head segments to reduce artifacts produced by the overlapping of said print head segments.