Patent ID: 8840215

Claim:
A printing device comprising: a print head including a plurality of nozzles arranged in a first direction and spaced apart by a prescribed nozzle pitch, the plurality of nozzles being configured to form dots having a same color on a recording sheet; a scanning portion configured to perform a scan in which the scanning portion moves the print head relative to the recording sheet in the first direction; a head drive portion configured to drive at least one nozzle of the plurality of nozzles to form dots such that a raster line configured of the dots extends in a second direction different from the first direction; and a print control processor configured to perform a print operation in a resolution in which a plurality of raster lines is arranged in the first direction by a line pitch smaller than the prescribed nozzle pitch by using a prescribed print method and by controlling the print head, the scanning portion, and the head drive portion, the prescribed print method printing the plurality of raster lines arranged in the first direction in a prescribed order, wherein the print control processor is configured to control the scanning portion to convey the recording sheet by a biased conveying distance as a target conveying distance, wherein the biased conveying distance is set, depending on the prescribed print method, to be decreased or increased from a prescribed distance, the prescribed distance being an ideal value that achieves the resolution in which the plurality of raster lines is uniformly arranged in the first direction by the line pitch, wherein the prescribed print method defines the prescribed distance by D×(k×n+b), where D represents the line pitch, n represents a natural number set based on number of the at least one nozzle being used, k is a number given by N/D and is 3 or greater wherein N indicates the prescribed nozzle pitch, and b is a non-zero integer satisfying −(½)k≦b≦(½)k, wherein the biased conveying distance is set to be increased from the prescribed distance when a value of b is positive, whereas the biased conveying distance is set to be decreased from the prescribed distance when the value of b is negative.