In-situ printhead focus adjustment
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United States of America Patent
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Jul 18, 2017
Grant Date -
N/A
app pub date -
May 11, 2016
filing date -
May 11, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
A method is described for adjusting the focus position of a linear printhead in a digital printing system. A line image is printed including a plurality of variable linewidth lines at different cross-track positions. A digital image capture system is used to capture an image of the printed line image, and a data processing system is used to automatically analyze the captured image to determine linewidth parameters representing linewidths of the plurality of lines. Linewidth progression functions are determined for the lines responsive to the determined linewidths, wherein the linewidth progression functions represent the linewidth parameters as a function of position. The linewidth progression functions are analyzed to determine defocus characteristics of the linear printhead, which are used to adjust the focus position of the linear printhead.
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