Printhead alignment test pattern and method for determining...

Details Printhead alignment test pattern and method for determining... Printhead alignment test pattern and method for determining...

2006-05-16

2006-05-16

Pham, Hai (Department: 2853)

Incremental printing of symbolic information

Ink jet

Controller

C347S014000, C347S015000

Reexamination Certificate

active

07044573

ABSTRACT:
A printhead alignment test pattern has spaced-apart images at least partially aligned along an axis. Each image includes leading and trailing edge portions having respective image-outermost leading and trailing edges spaced apart along the axis and includes an intervening portion located between the leading and trailing edge portions. The leading and trailing edge portions have a higher print density than the intervening portion. A method for determining a printhead misalignment of a printer prints the test pattern, moves a sensor along the axis over the images, obtains data from the sensor, determines the locations along the printhead scan axis of the leading and/or trailing edges of the images using the data, and calculates the printhead misalignment from the determined locations of the leading and/or trailing edges of the images. The test pattern reduces cockling of the print media which improves the accuracy of the method.

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