Patent ID: 7360866

Claim:
An inkjet printer comprising: a head unit for ejecting droplets of ink onto printing media; a moving mechanism for moving said head unit relatively to said printing media toward a predetermined scan direction along said printing media; and an ejection control part for controlling ejection of ink from said head unit, wherein said head unit comprises a first ejection module including a first outlet group; and a second ejection module including a second outlet group disposed at a predetermined distance away from said first outlet group in said scan direction, adjacently to said first outlet group in a width direction orthogonal to said scan direction, said first outlet group includes at least one first outlet row in which outlets are arranged in a first tilt direction which tilts from said width direction by a minute angle in a plane parallel to said printing media, said second outlet group includes at least one second outlet row in which outlets are arranged in a second tilt direction which tilts from said width direction to an opposite side of said first tilt direction by said minute angle in a plane parallel to said printing media; outlets in each of said at least one first outlet row and outlets in any of said at least one second outlet row are continuously disposed at a regular pitch in said width direction, and with a control by said ejection control part, a writing is performed on a first line segment which is directed toward said first tilt direction on said printing media through a first ejection control performed simultaneously for all outlets in each first outlet row and after said head unit is moved relatively to said printing media by said predetermined distance from a position of said first ejection control, a writing is performed on a second line segment which extends in said second tilt direction continuously from said first line segment through a second ejection control performed simultaneously for all outlets in each second outlet row.