Patent ID: 8807685
Filing Date: 2014-08-19
Classification: B41J

Abstract:
1. An image forming device for forming a color image on a print paper by arranging a line head in which a plurality of nozzles is provided, and is arranged so as to extend along a main-scanning direction, for each color at intervals in a sub-scanning direction perpendicular to the main-scanning direction, and causing ink droplets from the nozzle corresponding to the line head of each color to land on the same pixel of the print paper transferred in the sub-scanning direction by a transfer belt, the image forming device comprising: a landing-position-deviation-pattern acquisition unit configured to acquire a landing position deviation pattern of ink droplets of each color, for at least one period, from a test pattern image in a plurality of chromatic colors formed on the print paper by the ink droplets from the line head; a storage unit configured to storing, as correction profile data which is associated with an amount of rotation of the transfer belt corresponding to the one period, a correction pattern of an ejection timing of ink of each color, for setting, to a certain level, the relative deviation of landing position of ink droplets of each color obtained from the landing position deviation pattern of ink droplets of each color for the one period, during the rotation of the transfer belt corresponding to the one period; and a corrector configured to determine the amount of ejection timing correction of ink droplets by each nozzle of the line head of each color on the basis of the correction profile data stored in the storage unit for each color and the amount of rotation of the transfer belt and configured to correct the ejection timing of ink droplets by each nozzle of the line head of each color with the determined amount of correction.