MISREGISTRATION CORRECTION FOR BIDIRECTIONAL PRINTING WITH REDUCED INFLUENCE OF ERROR DUE TO VERTICAL SCANNING

摘要

A misregistration check pattern is printed without vertical scanning by using groups of nozzles. The check pattern comprises a "check rear pattern" and a "check front pattern" which are mutually shifted in the direction of the vertical scanning. The "check rear pattern" is printed by a rear group of nozzles, and the "check front pattern" is printed by a front group of nozzles. A correction value is determined according to correction information selected from a misregistration check pattern and representing a preferable corrected state. Thereafter the error of the recording position in the horizontal scanning direction in bidirectional printing is corrected according to the correction value.