Printhead with segments and compensation for temperature induced misalignments

摘要

A printhead with a series of overlapping printhead segments, all controlled by a print engine controller that adjusts for the temperature variable overlap between the segments to reduce visually perceptible artefacts. The controller employs a summation means which sums a current dither value from a dither matrix with an overlap signal to provide an output value which is then compared in a comparator with an input continuous tone data value providing an output compensated dither value to control nozzles in the overlap region of the segments. Alternatively it uses a software program to provide the compensated dither matrix. A temperature sensing means provides a measure of the degree of overlap of the segments to generate the overlap signal. The degree of overlap may be determined for various temperatures and stored in a ROM.