| US 7,506,960 B2 | ||
| Nozzle head, line head using the same, and ink jet recording apparatus mounted with its line head | ||
| Kazunari Chikanawa, Tamana (Japan); Hiroaki Nakashima, Kasuga (Japan); Seishi Tomari, Fukuoka (Japan); Hiroyuki Matsuba, Ohnojo (Japan); Tohru Nakagawa, Kusatsu (Japan); Hideo Torii, Higashiosaka (Japan); and Takeshi Kamada, Nara (Japan) | ||
| Assigned to Panasonic Corporation, Osaka (Japan) | ||
| Filed on Apr. 28, 2004, as Appl. No. 10/833,286. | ||
| Claims priority of application No. P.2003-124099 (JP), filed on Apr. 28, 2003; application No. P.2003-124100 (JP), filed on Apr. 28, 2003; application No. P.2003-124101 (JP), filed on Apr. 28, 2003; application No. P.2003-124102 (JP), filed on Apr. 28, 2003; and application No. P.2004-110804 (JP), filed on Apr. 05, 2004. | ||
| Prior Publication US 2005/0001877 A1, Jan. 06, 2005 | ||
| Int. Cl. B41J 2/155 (2006.01) | ||
| U.S. Cl. 347—42 | 6 Claims |
| 1. 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.
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