Ink jet printing apparatus and ink jet printing method
AssigneeCanon Kabushiki Kaisha
InventorsMichinari Mizutani, Torachika Osada
Life of this patent
Estimating the term…
Abstract
An adverse effect of air flows occurring near the nozzle line with high print duty is reliably avoided by appropriately dividing and allocating the print data to a plurality of ink ejection nozzle lines. When the print head is scanning in a forward direction, a combination of a magenta ink nozzle line and a yellow ink nozzle line that do not adjoin each other is mainly used. When the print head is scanning in a backward direction, another combination of a magenta ink nozzle line and a yellow ink nozzle line that do not adjoin each other is mainly used.
Claims19
An ink jet printing apparatus to print an image by moving a print head in a main scan direction, wherein the print head has a plurality of nozzle lines capable of ejecting ink, the plurality of nozzle lines are arrayed side by side, and the main scan direction crosses a longitudinal direction of each nozzle line, the ink jet printing apparatus comprising:
- allocation unit that allocates multivalued data representing gradation values corresponding to the number of dots to be printed in one pixel to the plurality of nozzle lines at different data allocation ratios;
- and
- control unit that ejects the ink from the print head according to the multivalued data allocated by the allocation unit,
- wherein the allocation unit sets the data allocation ratios for the plurality of nozzle lines to different ratios so that the nozzle lines with high data allocation ratio do not concentrate in position in the main scan direction.
An ink jet printing apparatus to print an image by moving a print head in a main scan direction, wherein the print head has a plurality of nozzle lines capable of ejecting ink, the plurality of nozzle lines are arrayed side by side, and the main scan direction crosses a longitudinal direction of each nozzle line, the ink jet printing apparatus comprising:
- allocation unit that allocates print data representing a dot print action or a non-print action to each of the plurality of nozzle lines at different data allocation ratios;
- and
- control unit that ejects the ink from the print head according to the multivalued data allocated by the allocation unit,
- wherein the allocation unit sets the data allocation ratios for the plurality of nozzle lines to different ratios so that the nozzle lines with high data allocation ratio do not concentrate in position in the main scan direction.
An ink jet printing method to print an image by moving a print head in a main scan direction, wherein the print head has a plurality of nozzle lines capable of ejecting ink, the plurality of nozzle lines are arrayed side by side, and the main scan direction crosses a longitudinal direction of each nozzle line, the ink jet printing method comprising:
- an allocation step to allocate multivalued data representing gradation values corresponding to the number of dots to be printed in one pixel to the plurality of nozzle lines at different data allocation ratios;
- and
- a control step to eject the ink from the print head according to the multivalued data allocated by the allocation step,
- wherein the allocation step sets the data allocation ratios for the plurality of nozzle lines to different ratios so that the nozzle lines with high data allocation ratio do not concentrate in position in the main scan direction.
Dependencies are inferred from the claim text.