Patent ID: 7959246
Filing Date: 2011-06-14
Classification: B41J

Abstract:
1. A printing apparatus for printing on a printing medium by using a printhead which has a first nozzle array including a plurality of nozzles from which a first amount of ink is discharged and a second nozzle array including a plurality of nozzles from which a second amount of ink is discharged, the second amount of ink being different from the first amount of ink, wherein each of the first nozzle array and the second nozzle array is divided into a plurality of blocks, the apparatus further comprising: driving means for driving a block in the plurality of blocks; selection means for alternately selecting from the first nozzle array in a first driving order and from the second nozzle array in a second driving order, a block to be driven by said driving means, wherein the first driving order is different from the second driving order; and control means for time-divisionally controlling said selection means to select a block from the first nozzle array and subsequently select a block from the second nozzle array and sequentially select each following block from each nozzle array within a predetermined period, the predetermined period defining a print resolution in the main scanning direction, and wherein the printhead includes the driving means.