A correction system for droplets positioning errors in the pressure the direction of axis in the ink jet printers.

摘要

A method and apparatus for correcting for drop placement errors due to relative rotation between an inkjet printhead mounted in a printer carriage and the print media to be printed on comprises first determining the relative contribution to the drop placement error (DPEy) due to rotation of the printhead about the scan axis (Y axis-error), then, with respect to any determined Y axis error, applying the same magnitude and sense of correction for drop placement errors while printing in both a first scanning direction of the carriage and while printing in a second scanning direction of the carriage. Errors (DPEz) due to rotation about the Z axis are also corrected for. Preferably the errors are determined by printing and scanning a test pattern.