Patent ID: 8342647

Claim:
An inkjet printing apparatus capable of mounting a print head, the print head ejecting inks from a plurality of nozzle arrays onto a print medium, the printing apparatus comprising moving means effecting relative movement of the print head in a forward direction and in a backward direction and print medium conveying means, wherein the plurality of nozzle arrays are arranged to cross a moving direction in which the moving means effects the relative movement of the print head, wherein the plurality of nozzle arrays include a first nozzle array and a second nozzle array which are arranged to be parallel in the moving direction and both ejecting the same color ink, wherein the first nozzle array and the second nozzle array are arranged at positions such that a fluid viscosity resistance between the print head and the print medium beneath the first nozzle array which occurs as the moving means moves the print head in the forward direction is almost equal to a fluid viscosity resistance between the print head and the print medium beneath the second nozzle array which occurs as the moving means moves the print head in the backward direction, and wherein a distance from a front end of the print head to the first nozzle array as the print head moves in the forward direction is almost equal to a distance from the front end of the print head to the second nozzle array as the print head moves in the backward direction.