Method of estimating alignment

Details Method of estimating alignment Method of estimating alignment

2011-08-02

2011-08-02

Nguyen, Lam S (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

C347S005000, C347S009000

Reexamination Certificate

active

07988252

ABSTRACT:
The invention relates to a method of estimating the alignment in the printing medium direction between a first and a second pen of a printing system having a scan axis, whereby: the first, respectively second pen prints a first, respectively second pattern element; the first and second pattern elements are substantially aligned and separated by a space along the scan axis; each of the first and second pattern elements comprises a first and an associated second mark separated by a blank along the scan axis, the first and the second marks being staggered in the printing medium direction; an optical sensor scans along the scan axis over the first and second pattern elements, an analysis of the sensor output leading to estimating the alignment.

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