US 11,987,062 B2
Method for correcting image and printing apparatus
Daiki Kato, Nagoya (JP); Hiroto Sugahara, Ama (JP); and Taro Nagano, Nagoya (JP)
Assigned to BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed by BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed on Aug. 10, 2022, as Appl. No. 17/818,832.
Claims priority of application No. 2021-153600 (JP), filed on Sep. 21, 2021.
Prior Publication US 2023/0091544 A1, Mar. 23, 2023
Int. Cl. B41J 2/21 (2006.01); B41J 2/045 (2006.01)
CPC B41J 2/2146 (2013.01) [B41J 2/04508 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A method for correcting an image, comprising:
moving first and second ink jet heads and a medium relative to each other, the first and second ink jet heads being arranged along a first direction, each of the first and second ink jet heads including nozzles and drive elements corresponding to the nozzles respectively, the first and second ink jet heads and the medium being moved relative to each other in a second direction intersecting with the first direction;
discharging ink droplets from the nozzles of the first and second ink jet heads, by connecting each of the drive elements to one of power supply circuits and by applying voltage to each of the drive elements at a predetermined timing while moving the first and second ink jet heads and the medium in the second direction, the power supply circuits having different output voltage values to each other;
determining a density difference between a first image region and a second image region, the first image region being formed on the medium by the ink droplets discharged from first nozzles, the first nozzles being included in the nozzles of the first ink jet head and being positioned in an end portion on one side in the first direction among the nozzles of the first ink jet head, the second image region being formed on the medium by the ink droplets discharged from second nozzles, the second nozzles being included in the nozzles of the second ink het head and being positioned in an end portion on the other side in the first direction among the nozzles of the second ink jet head; and
switching the voltage to be applied to first drive elements to a first voltage by switching the power supply circuits to be connected to the first drive elements based on the density difference, the first drive elements being included in the drive elements of the first ink jet head and corresponding to the first nozzles, the first voltage being different from the voltage to be applied to drive elements, of the first ink jet head, other than the first drive elements.