Patent ID: 7581804
Filing Date: 2009-09-01
Classification: B41J

Abstract:
1. A printing apparatus comprising: a carry section provided with a carry roller for intermittently carrying a medium on which an image is to be printed in increments of a predetermined amount in a carrying direction; a nozzle that forms a dot based on corrected data obtained by correcting image data for printing the image on the medium that has been carried by the carry section; a correction value table in which a set region is associated with a correction value for performing the correction, the set region being virtually set so that a theoretical circumferential surface length of the set region from a predetermined reference position in a circumferential direction of the carry roller is equal to a theoretical amount of the predetermined amount; and a controller that causes a dot to be formed based on the corrected data that has been corrected based on the correction value table; wherein the nozzle forms a row of dots on the medium by ejecting ink while being moved in a movement direction that intersects the carrying direction, and the correction value table is created based on a read result of a correction pattern so as to suppress unevenness in density between row regions each formed with the row of dots arranged along the movement direction, and wherein the image data indicates a tone value of each unit region, a correction value is obtained for each row region based on the read result of the correction pattern that is printed based on the image data indicating a predetermined tone value, and, in the correction value table, the set region that was in contact with the medium during the carrying operation immediately before the dot forming operation that formed the row of dots configuring the correction pattern is associated with a correction value corresponding to the row region in which a row of dots is formed by that dot row forming operation.