Method and apparatus for image squareness correction

Details Method and apparatus for image squareness correction Method and apparatus for image squareness correction

2006-07-04

2006-07-04

Tran, Huan (Department: 2861)

Incremental printing of symbolic information

Electric marking apparatus or processes

Electrostatic

C399S301000

Reexamination Certificate

active

07071956

ABSTRACT:
A method of correcting output image squareness in a laser printer system having a Raster Output Scanning (ROS) device with a pivotal mounting. The method includes printing a test pattern that includes a plurality of markers printed in a predetermined geometric arrangement and calculating a skew angle based on the measured distances, preferably using the Law of Cosines. The ROS device is then automatically rotated by an amount sufficient to correct the skew angle. The ROS rotation is performed automatically by an adjustment system connected to the ROS. The method optionally includes a scanner for scanning the test pattern image and making the measurements automatically via a program configured to analyze the scanned image.

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