Inkjet printer

摘要

An inkjet printer includes nozzle rows aligned along a printing direction along which printing on a print medium is executed, and a controller configured to control ejection of the ink droplets from the nozzle rows. The nozzle rows include a pair of an upstream nozzle row and a downstream nozzle row. The upstream nozzle row is positioned just upstream from the downstream nozzle row along the printing direction. The controller controls ejection of the ink droplets from the upstream nozzle row and the downstream nozzle row so that propulsive forces applied to ink droplets ejected from the downstream nozzle row are made larger, based on image data associated with the upstream nozzle row, than propulsive forces applied to ink droplets ejected from the upstream nozzle row. The inkjet printer can restrict degradation of print quality by landing the ink droplets ejected from the downstream nozzle at their target positions.

主权项

1. An inkjet printer comprising:
a plurality of nozzle rows aligned along a printing direction along which printing on a print medium is executed; and a controller configured to control ejection of ink droplets from the plurality of nozzle rows, wherein the controller executes printing on the print medium by ejecting ink droplets from the plurality of nozzle rows onto the print medium while moving the plurality of nozzle rows relatively to the print medium based on image data, the plurality of nozzle rows includes a pair of an upstream nozzle row and a downstream nozzle row, the upstream nozzle row being positioned just upstream from the downstream nozzle row along the printing direction, the controller controls ejection of the ink droplets from the upstream nozzle row and the downstream nozzle row so that propulsive forces applied to ink droplets ejected from the downstream nozzle row are made larger, based on image data associated with the upstream nozzle row, than propulsive forces applied to ink droplets ejected from the upstream nozzle row, wherein the image data are multiple-valued data for allocating ink droplets to be ejected to nozzles in the plurality of nozzle rows; and an image processing unit that converts the image data by reallocating ink droplets allocated to nozzles in the downstream nozzle row so as to decrease the number of nozzles to be used for ejection of the ink droplets and to increase the number of ink droplets to be sequentially ejected from each of the nozzles to be used, wherein the controller controls ejection of ink droplets from the upstream nozzle row and the downstream nozzle row independently from each other based on the image data converted by the image processing unit.