Patent ID: 8757753

Claim:
A printing apparatus comprising: a printing head for performing printing on a printing medium, said printing head including a plurality of first nozzles forming a first nozzle array in a predetermined direction that ejects ink containing a coloring material and a plurality of second nozzles forming a second nozzle array, in the predetermined direction, that ejects processing liquid for coagulating or insolubilizing a coloring material in the ink; and a driving unit that drives the nozzles for printing on the printing medium by ejecting the ink and the processing liquid while scanning the recording head and the printing medium relatively, the driving unit being configured to drive the plurality of first nozzles such that, for a group consisting of a number of the first nozzles, the number of the first nozzles belonging to the group are sequentially driven in a predetermined order to eject ink and configured to drive the plurality of second nozzles such that, for a group consisting of a number of the second nozzles, the number of the second nozzles belonging to the group are sequentially driven in a predetermined order to eject processing liquid, wherein the driving unit drives a predetermined first nozzle in the plurality of first nozzles at a K-th order and drives a predetermined second nozzle in the plurality of second nozzles at an L-th order, L being different from K, such that an order of ejection of the ink from the predetermined first nozzle in the group of the first nozzle array is different from an order of ejection of the processing liquid from the predetermined second nozzle in the group of the second nozzle array at a position corresponding to a position of the predetermined first nozzle in the predetermined direction.