	US 7,500,729 B2
	Method for correcting an amount of ejected ink in line head inkjet printer
Atsuo Sakaida, Gifu (Japan)
Assigned to Brother Kogyo Kabushiki Kaisha, Nagoya-shi, Aichi-ken (Japan)
Filed on Aug. 05, 2005, as Appl. No. 11/197,324.
Claims priority of application No. 2004-229736 (JP), filed on Aug. 05, 2004; application No. 2004-229737 (JP), filed on Aug. 05, 2004; and application No. 2004-229738 (JP), filed on Aug. 05, 2004.
Prior Publication US 2006/0050101 A1, Mar. 09, 2006
Int. Cl. B41J 29/38 (2006.01); B41J 29/393 (2006.01)

U.S. Cl. 347—14 [347/6; 347/19]

9 Claims

1. A method for correcting an amount of ejected ink in a line head inkjet printer including an inkjet head having

a plurality of nozzles, which are divided into blocks including at least one nozzle,

a flow path unit in which the plurality of nozzles are formed, and

a plurality of actuator units having a trapezoidal shape, the actuator units being arranged on the flow paths unit so that oblique sides of adjacent actuator units overlap each other when viewed in a conveyance direction,

the method composing:

measuring the amount of ink ejected from each of n of the blocks divided by n−1 virtual lines extending in the conveyance direction of a printing medium where n represents a natural number equal to or greater than 2, wherein the virtual lines each pass through a corresponding one of a plurality of structural change points in the inkjet head, each structural change point corresponding to a point where an oblique side of one of the actuator units intersects with a short side of the one of the actuator units, the structural change points extending in a direction perpendicular to the conveyance direction; and

obtaining a correction factor for each block on a basis of the measured amount of ejected ink in each block, the correction factors making a difference among the blocks in an amount of ejected ink per nozzle becoming smaller than that without using the obtained correction factors.