Patent ID: 8708444

Claim:
An inkjet printer comprising: a head that ejects fine droplets of ink toward a base material; a movement mechanism that moves said base material in a predetermined movement direction relative to said head; and a control part that controls ink ejection from said head, wherein said head includes a first outlet row and a second outlet row, each including a plurality of outlets arranged with a fixed outlet pitch in a direction that intersects said movement direction, said first outlet row and said second outlet row being arranged in said movement direction, each outlet in said second outlet row is disposed between each pair of adjacent outlets in said first outlet row with respect to a width direction perpendicular to said movement direction, uniform images are recorded in a plurality of check regions, each being a region of a predetermined size on said base material, under control of said control part, assuming that a plurality of dots arranged in said width direction is taken as a dot row in the uniform image in each check region, a combination of a first dot row formed with said first outlet row and a second dot row formed with said second outlet row while being spaced apart from said first dot row in said movement direction is repeatedly arranged with a fixed pitch in said movement direction, when the uniform image is recorded in said each check region, a distance that is obtained by changing a reference distance, which is half said pitch, by a set shift amount is assigned as a distance between said first dot row and said second dot row by said control part, said set shift amount being progressively changed for said plurality of check regions, in said plurality of check regions, an overlapping area of said first dot row and said second dot row varies depending on an actual shift amount of a distance between said first dot row and said second dot row from said reference distance, and said control part includes an input receiving part and an ejection timing correction part, said input receiving part receiving an input signal for specifying a maximum density check region that has a maximum dot area rate in the uniform image out of said plurality of check regions, and said ejection timing correction part correcting ejection timing of said second outlet row with respect to ejection timing of said first outlet row, based on a set shift amount corresponding to said maximum density check region.