| 摘要 |
An ink-jet printer for printing an image of high quality even in a printing mode where major line feed and minor line feed are combined, comprising a head which has B ink-jet nozzles (B is an integer) for jetting the same ink arranged in the vertical scanning direction at substantially regular intervals and is movable in the horizontal scanning direction perpendicular to the vertical scanning direction, and a vertical scanning mechanism for moving a recording medium in the vertical scanning direction relatively to the ink head, wherein the nozzle intervals are A times the dot pitch (d) (A is an integer), the printing is performed by repeating a step which includes one print scanning (horizontal scanning) in the horizontal scanning direction, a minor line feed printing and a major line feed for moving the recording medium by a distance (BxA-(Axn+1)(CxA-1))xd, the minor line feed printing is repeating a sub-step (CxA-1) times (C is an integer), and the sub-step comprises a minor line feed for moving the recording medium in the vertical scanning direction relatively to the ink head by a distance ((Axn+1)xd) which is the sum of n times (n is an integer) the nozzle interval and one dot pitch, and one print scanning in the horizontal scanning direction.
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