Incremental printing of symbolic information – Ink jet – Controller
Reexamination Certificate
2004-10-18
2008-12-16
Meier, Stephen D (Department: 2853)
Incremental printing of symbolic information
Ink jet
Controller
C347S019000, C347S022000
Reexamination Certificate
active
07465007
ABSTRACT:
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 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 sensor measures 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.
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Lapstun Paul
Silverbrook Kia
Walmsley Simon
Al-Hashimi Sarah
Meier Stephen D
Silverbrook Research Pty Ltd
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