Patent ID: 6669321
Filing Date: 2003-12-30
Classification: B41J

Abstract:
A correction method of correcting a printing position shift when printing on a printing medium is performed by discharging ink from a printhead while reciprocally scanning the printhead, comprising:a test printing step, of test-printing a plurality of patterns, wherein the plurality of patterns are patterns printed by changing a printhead scanning speed; a selection step, of selecting one of the plurality of printed patterns; a storage step, of storing information, on an ink discharge velocity from the printhead used for test-printing the selected pattern after performing said selection step, into a memory; and a calculation step, of calculating a correction amount for correcting the printing position shift, based on the selected pattern, wherein said calculation step includes calculating the correction amount, based on the information stored in the memory, and said test-printing step includes test-printing by controlling ink discharge from the printhead according to the changed printhead scanning speed.