Ink jet printing apparatus and ink jet printing method

摘要

An object of the present invention is to provide an ink jet printing apparatus which can prevent possible stripe-like density unevenness in a joint in a print head constructed by joining a plurality of chips together even if the print head is inclined to the regular position of the print head. The present invention uses a print head having the nozzle arrays being shifted in a direction in which the nozzles are arranged, so as to have overlapping portions in a direction orthogonal to the nozzle arranging direction. The present invention controls an ink ejecting operation of the nozzles in the overlapping portions between the plurality of nozzle arrays on the basis of an angle between the nozzle array arranging direction and a direction orthogonal to the direction in which the print head moves relative to the print medium.

主权项

1. An ink jet printing apparatus comprising:
a conveyance unit configured to convey a print medium in a first direction; a print head unit configured to print on the print medium, the print head unit comprising a first print head chip that includes a first nozzle array formed by first nozzles, and a second print head chip that includes a second nozzle array formed by second nozzles, the first print head chip and the second print head chip being arrayed in a second direction crossing the first direction such that the first nozzles in the first print head chip and the second nozzles in the second print head chip print two adjacent lines, respectively, each of which is printed in a direction crossing the second direction; and a controller configured to control ejection of ink by the first nozzles and the second nozzles according to an angle between a longitudinal direction of the print head unit and the first direction.