US 11,813,869 B2
Liquid droplet ejecting apparatus
Yosuke Takahira, Nagoya (JP); and Masaru Someya, Nagoya (JP)
Assigned to Brother Kogyo Kabushiki Kaisha, Nagoya (JP)
Filed by BROTHER KOGYO KABUSHIKI KAISHA, Nagoya (JP)
Filed on Apr. 28, 2022, as Appl. No. 17/731,311.
Claims priority of application No. 2021-075653 (JP), filed on Apr. 28, 2021.
Prior Publication US 2022/0348017 A1, Nov. 3, 2022
Int. Cl. B41J 29/393 (2006.01); B41J 2/165 (2006.01)
CPC B41J 2/1652 (2013.01) [B41J 29/393 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A liquid droplet ejecting apparatus comprising:
a liquid droplet ejecting head which has a nozzle array composed of a plurality of nozzles aligned in a first direction;
a relative movement mechanism which is configured to relatively move the liquid droplet ejecting head and a recording medium in the first direction; and
a controller,
wherein the controller is configured to record, on the recording medium, a nonuniformity correction pattern in order to correct any dispersion in liquid droplet ejection amount among the plurality of nozzles, by controlling the liquid droplet ejecting head and the relative movement mechanism,
in a case of recording the nonuniformity correction pattern, the controller is configured to:
control the liquid droplet ejecting head to eject liquid droplets from at least a first nozzle to thereby record a first pattern group which is composed of a plurality of first pattern portions aligned in a second direction intersecting with the first direction, the first nozzle being an outermost end nozzle disposed on one side in the first direction of the nozzle array, the first pattern group being a part of the nonuniformity correction pattern;
control the relative movement mechanism to relatively move the liquid droplet ejecting head and the recording medium in the first direction by a predetermined distance; and
control the liquid droplet ejecting head to eject the liquid droplets from at least a second nozzle to thereby record a second pattern group which is composed of a plurality of second pattern portions aligned in the second direction, the second nozzle being an outermost end nozzle disposed on the other side in the first direction of the nozzle array, the second pattern group being a part of the nonuniformity correction pattern,
portions, which are recorded by the second nozzle and included in the plurality of second pattern portions, are adjacent in the first direction to portions, which are recorded by the first nozzle and included in the plurality of first pattern portions,
the first pattern group includes a reference first pattern portion which is positioned between the first pattern portion disposed at an outermost end on one side in the second direction and the first pattern portion disposed at another outermost end on the other side in the second direction,
the second pattern group includes a reference second pattern portion which is positioned between the second pattern portion disposed at an outermost end on one side in the second direction and the second pattern portion disposed at another outermost end on the other side in the second direction, the reference second pattern portion being adjacent to the reference first pattern portion in the first direction,
in a case of recording the first pattern group, the controller is configured to control the liquid droplet ejecting head such that the first pattern portion disposed at the outermost end on one side in the second direction has a density which is thinned as compared with a density of the reference first pattern portion, and
in a case of recording the second pattern group, the controller is configured to control the liquid droplet ejecting head such that the second pattern portion disposed at the outermost end on the other side in the second direction has a density which is thinned as compared with a density of the reference second pattern portion.