CPC B41J 2/2139 (2013.01) [B41J 2/0451 (2013.01); B41J 2/16579 (2013.01)] | 17 Claims |
1. A liquid discharge apparatus comprising:
a head having a plurality of nozzles;
a conveyer configured to convey a recording medium in a conveyance direction; and
a controller, wherein:
the plurality of nozzles is distanced from each other in the conveyance direction;
the controller is configured to carry out, based on an image data, a conveyance process of conveying the recording medium in the conveyance direction by the conveyer, and a discharge process of discharging a liquid from the plurality of nozzles to the recording medium;
the discharge process includes a plurality of discharge steps to be carried out to a unit area of the recording medium with a time interval to discharge the liquid selectively from the plurality of nozzles based on data obtained by decomposing the image data into complementary patterns;
in at least one of the plurality of discharge steps corresponding to the unit area, a function of a discharge duty of the nozzles with respect to positions of the nozzles in the conveyance direction has an ascending portion gradually increasing from upstream to downstream in the conveyance direction or a descending portion gradually decreasing from upstream to downstream in the conveyance direction;
in an area including a plurality of pieces of the unit area adjacent to each other in the conveyance direction, the function is composed at least of the ascending portion and the descending portion; and
the controller is configured to carry out before carrying out the discharge process:
a detection process of detecting a defect nozzle in the plurality of nozzles; and
in a case that the defect nozzle is detected in the detection process, a change process of changing the function.
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