Method for setting focus of a multichannel printhead

Details Method for setting focus of a multichannel printhead Method for setting focus of a multichannel printhead

2005-01-11

2005-01-11

Feggins, K. (Department: 2861)

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

Reexamination Certificate

active

06842188

ABSTRACT:
A method for setting focus of a multichannel printhead for an imaging apparatus (10) comprises moving the printhead (500) to a premove position. A first set of patches (82) is printed wherein a focus position of the printhead is varied in a first random pattern from one patch to another. A second set of patches (83) is printed wherein the focus position of the printhead is varied in a second random pattern from one patch to another. A density for each of the patches is measured in the first series of patches. A density for each of the patches is measured in the second series of patches. An optimum focus position is calculated for the multichannel printhead based on a polynomial curve (72) of density and focus position for each of the patches.

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patent: 5754275 (1998-05-01), Takeda
patent: 6232999 (2001-05-01), Kerr et al.
patent: 20020131029 (2002-09-01), Uchiyama

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