Patent ID: 7963633

Claim:
An ink jet recording head movable in a main scanning direction and provided with a plurality of nozzles capable of ejecting ink, the nozzles being arranged in the main scanning direction and in a sub-scanning direction crossing the main scanning direction, said plurality of nozzles comprising first, second, and third nozzles in order of largest ink ejection capacity to smallest, wherein: said first nozzles form a nozzle column at one end and a nozzle column at the other end located apart from each other in the main scanning direction, said second nozzles and said third nozzles form middle nozzle columns located between said nozzle column at the one end and said nozzle column at the other end, a pitch in the sub-scanning direction of said second nozzles and said third nozzles forming said middle nozzle columns is smaller than that of said first nozzles forming said nozzle column at the one end and said nozzle column at the other end, centers of said first nozzles forming said nozzle column at the one end and centers of said first nozzles forming said nozzle column at the other end are shifted relative to each other in the sub-scanning direction, centers of said first, second, and third nozzles are shifted relative to each other in the sub-scanning direction, said first nozzles and said third nozzles are shifted in the sub-scanning direction by one-quarter of a pitch of said second nozzles and said third nozzles, and said first nozzles and said second nozzles are shifted in the sub-scanning direction by three-quarters of a pitch of said second nozzles and said third nozzles.