Patent ID: 7618119

Claim:
An ink jet printing head comprising: four nozzle groups, with each nozzle group being provided with a plurality of nozzle arrays and each nozzle array being provided with a plurality of nozzles which are configured to eject ink and are arranged along a first direction, wherein, of the four nozzle groups, a first nozzle group, a second nozzle group, a third nozzle group and a fourth nozzle group are arranged in the first direction in order of the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group, wherein the first nozzle group and third nozzle group are aligned in the first direction and the second nozzle group and fourth nozzle group are aligned in the first direction, wherein the first nozzle group and the second nozzle group are arranged adjacently to each other in a second direction perpendicular to the first direction, the second nozzle group and the third nozzle group are arranged adjacently to each other in the second direction, and the third nozzle group and the fourth nozzle group are arranged adjacently to each other in the second direction, wherein only end portions of the nozzle arrays in the nozzle groups adjacent to each other overlap each other in the second direction, and wherein a distance in the second direction between adjacent nozzle arrays in each nozzle group is equal to a distance in the second direction between a first nozzle array of one nozzle group and a second nozzle away of another nozzle group of the nozzle groups adjacent one another in the second direction, the first nozzle array being on a side closest to the other nozzle group and the second nozzle array being on a side closest to the one nozzle group.