Patent ID: 8262188

Claim:
A printing device comprising: a first nozzle column in which nozzles discharging liquid to a medium are arranged in a line in a first direction; a second nozzle column in which nozzles discharging liquid to the medium are arranged in a line in the first direction, in which the first and second nozzle columns are arranged in a second direction intersecting with the first direction; a control portion which causes the first nozzle column and the second nozzle column to discharge the liquid to the medium while moving at least one of the medium and a set of the first and second nozzle columns so that the medium and the set of the first and second nozzle columns move relatively to each other in a moving direction which is along the second direction, wherein the control portion forms a first correction pattern composed of a first pattern formed by the first nozzle column along the moving direction and a second pattern formed by the second nozzle column along the moving direction in parallel with the first pattern with the second pattern being offset from the first pattern in a direction intersecting with the moving direction, and the control portion forms a second correction pattern composed of a third pattern formed by the first nozzle column along the moving direction and a fourth pattern formed by the second nozzle column along the moving direction in parallel with the third pattern with the third pattern being offset from the fourth pattern in the direction intersecting with the moving direction, the control portion differentiates a distance in the first correction pattern between the first pattern and the second pattern with respect to the direction intersecting with the moving direction from a distance in the second correction pattern between the third pattern and the fourth pattern with respect to the direction intersecting with the moving direction by changing a size of dots formed by the first and second nozzle columns in the first correction pattern from a size of dots formed by the first and second nozzle columns in the second correction pattern.