Patent ID: 7506960

Claim:
A print head mounted on an ink jet recording apparatus that performs printing by ink ejection, said print head comprising: a first nozzle head comprising a first nozzle array and a second nozzle array, said first nozzle array and said second nozzle array each having a plurality of nozzle outlet holes for ejecting ink onto a recording medium, said first nozzle array being arranged parallel to said second nozzle array with a predetermined spacing, said first nozzle head being arranged such that said first nozzle array is oriented at an acute angle relative to a direction of relative movement between the print head and a recording medium; and a second nozzle head comprising a third nozzle array and a fourth nozzle array, said third nozzle array and said fourth nozzle array each having a plurality of nozzle outlet holes for ejecting ink onto a recording medium, said third nozzle array being arranged parallel to said fourth nozzle array with the predetermined spacing, said second nozzle head being arranged such that said third nozzle array is parallel to said first nozzle array, wherein a position in a sub-scanning direction of, at least, a first nozzle outlet hole of said nozzle outlet holes located at one end of said first nozzle array overlaps with a position in a sub-scanning direction of, at least, a third nozzle outlet hole of said nozzle outlet holes located at the other opposite end of said third nozzle array so that the overlapping nozzle holes are capable of delivering ink to the same target, the sub-scanning direction being perpendicular to a transporting direction of a recording medium, and wherein ink ejection in the sub-scanning direction can be performed alternately or irregularly from said first nozzle outlet hole of said first nozzle array and said third nozzle outlet hole of said third nozzle array, wherein the nozzle holes of the first nozzle array and the nozzle holes of the second nozzle array are disposed at positions where they are arranged alternately in a sub-scanning direction, and the nozzle holes of the third nozzle array and the nozzle holes of the fourth nozzle array are disposed at positions where they are arranged alternately in the sub-scanning direction, and wherein the nozzle holes of the first nozzle array and the nozzle holes of the third nozzle array are disposed at positions where they do not overlap and are not arranged alternately, except for the first nozzle hole of the first nozzle array and the third nozzle hole of the third nozzle array.