Patent ID: 6719403
Filing Date: 2004-04-13
Classification: B41J

Abstract:
An ink jet printing method of performing printing by ejecting ink onto a printing medium from a printing head while scanning the printing head relatively to the printing medium,wherein the printing head is provided, for at least two kinds of ink, with ejection opening rows, each including a plurality of ejection openings arranged in a direction different from a direction of the scanning, the ejection opening rows being arranged to be apart from each other in the scanning direction at a predetermined distance and including respective ejection openings overlapping each other in the scanning direction, wherein printing is performed in which the number of times of scanning is m (m is a positive integer), which is required for completing an image on a predetermined area by means of a first ejection opening row set for use out of the ejection opening rows for the at least two kinds of ink, and the number of times of scanning is n (n is a positive integer), which is required for completing an image on the predetermined area by means of a second ejection opening row set for use out of the ejection opening rows for the at least two kinds of ink, where at least one of m and n is 2 or more, and an amount at which the printing medium is moved for each time of the scanning in a direction different from the direction of the scanning is L (L is a positive integer), wherein the second ejection opening row is staggered, relative to the first ejection opening row toward a discharge side regarding moving of the printing medium at a distance (m+a)Ã—L (a is a positive integer), which is measured as a distance between respective ejection openings located at a feed side end regarding the moving of the printing medium.