Inkjet printhead alignment via measurement and entry

Details Inkjet printhead alignment via measurement and entry Inkjet printhead alignment via measurement and entry

1995-11-21

1998-12-08

Riley, Shawn

Incremental printing of symbolic information

Ink jet

Controller

B41J 29393

Patent

active

058477225

ABSTRACT:
Optical measurement is made for each nozzle position of a printhead relative to each printhead of an inkjet printing device. Alternatively, the measurement is made for each nozzle relative to a reference point. The reference point, for example, is a datum projection or indentation (i) on the printhead, (ii) integral to the pen body, or (iii) on the pen carriage. The measurement data subsequently is stored for later access. Alternative storage schemes include local storage in electronic memory associated with the pen and physical storage via bar code, magnetic stripes or physical markings. The stored alignment data thereafter is retrieved and input to printhead nozzle management software to adjust the timing for firing respective nozzles. The timing is adjusted to compensate for misalignment and achieve accurate dot placement on a media sheet.

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