Patent ID: 7837283

Claim:
An ink jet printing apparatus for printing an image on a print medium by using an inkjet head having a plurality of ejection openings arrayed in a predetermined direction, the ink jet printing apparatus comprising: moving means for performing a movement of the inkjet head relative to the print medium in a first direction crossing the predetermined direction; feeding means for performing a feeding operation of the print medium in a second direction crossing the first direction; and setting means for setting a feed distance for each feeding operation which is performed between a previous movement and a subsequent movement of the inkjet head, wherein the setting means sets each feed distance on the basis of a print duty in a previous print area which is printable with the previous movement of the inkjet head and a print duty in a subsequent print area, adjacent to the previous print area in the second direction, which is printable with the subsequent movement of the inkjet head, the feed distance being selected from among a plurality of feed distances which are changed from a basic feed distance, the basic feed distance being determined based on the number of scans of the inkjet print head that is required to complete the printing of the same area on the print medium, and wherein the feeding distance after each previous movement of the inkjet head is changeable.