Patent ID: 8011756
Filing Date: 2011-09-06
Classification: B41J

Abstract:
1. An imaging method for realizing full color printing, the method comprising: providing an ink head configured to discharge black ink and a plurality of primary color inks of cyan, magenta and yellow, the ink head including a first nozzle row group and a second nozzle row group, the first nozzle row group including a black nozzle row having black nozzles for discharging the black ink and a color nozzle row having first color nozzles for discharging yellow ink, the first color nozzles for discharging the yellow ink being arranged at first scanning line positions that are same in a sub scanning direction as scanning line positions of the black nozzles of the first nozzle row group, and the second nozzle row group including color nozzle rows having second color nozzles for discharging at least two primary color inks other than the yellow ink, the second color nozzles for discharging the at least two primary color inks other than the yellow ink being arranged at scanning line positions that are shifted from the scanning line positions of the first color nozzles for discharging the yellow ink by half a nozzle pitch in the sub scanning direction, printing a monochrome image portion, in accordance with image data of a specific resolution in the sub scanning direction, by printing a plurality of first rasters by ejecting the black ink and the yellow ink through the first nozzle row group, in accordance with the image data of the specific resolution in the sub scanning direction, and printing a second raster in between the first rasters using pseudo black ink that is realized by ejecting a remaining number of the primary color inks through the second nozzle row group, in accordance with the same image data of the specific resolution in the sub scanning direction, such that the printed monochrome image portion has a recording resolution higher than the specific resolution in the sub scanning direction.