Patent ID: 7008042

Claim:
An inkjet printer comprising: a plurality of heads groups, each heads group comprising a plurality of line heads as one unit for jetting ink having different colors from each other, the plurality of line heads extending in a direction perpendicular to a conveyance direction in which a recording medium is conveyed, wherein the plurality of heads groups are arrayed from upstream to downstream along the conveyance direction; each of the plurality of line heads comprises a plurality of nozzles for jetting the ink as minute liquid drops; the plurality of nozzles are arrayed at intervals of predetermined number of pixels along a direction perpendicular to the conveyance direction in each of the plurality of line heads in each of the plurality of heads groups; each nozzle of one line head is arranged at a position shifted from each nozzle of the other line head along the direction perpendicular to the conveyance direction so as to dispose each nozzle of the one line head within the interval of the predetermined number of pixels between the nozzles of the other line head; the plurality of line heads in one heads group are arranged according to the plurality of line heads in the other heads group so as to dispose the plurality of nozzles in the line heads in the one heads group and the plurality of nozzles in the line heads in the other heads group on the same columns along the conveyance direction; and line heads having nozzles disposed on one same column jet the ink having different colors from each other.