Patent ID: 8740329
Filing Date: 2014-06-03
Classification: B41J

Abstract:
1. An inkjet printing apparatus that prints dot for forming an image on a print medium by scanning, relatively to the print medium, a printhead having a plurality of nozzles forming a nozzle array in a direction intersecting with the nozzle array, such that each raster for forming the image is printed by different nozzles in each of multiple scans, the apparatus comprising: a drive control unit configured to divide the plurality of nozzles into groups, each including a plurality of adjacent nozzles and control drive of nozzles such that drive timings of nozzles differ among a plurality of blocks in each group, where one block corresponds to one nozzle from each group; and a determination unit configured to determine, for each of the multiple scans, a sequence in which nozzles are driven by the drive control unit, wherein adjacent printed dots are printed by two nozzles and the drive timings of the two nozzles are different from each other, wherein the determination unit determines, for each scan, a sequence in which nozzles among a plurality of blocks are driven, such that each interval distance between the adjacent printed dots is substantially equal in the raster, wherein the each interval distance corresponds to a timing difference of drive timings for printing the adjacent printed dots, and wherein the timing difference corresponds to a number of blocks plus a quotient value of the number of blocks divided by a number of scans.