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INK JET PRINTING APPARATUS AND INK JET PRINTING METHOD

  • US 20090046124A1
  • Filed: 08/08/2008
  • Published: 02/19/2009
  • Est. Priority Date: 08/14/2007
  • Status: Active Grant
First Claim
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1. An ink jet printing apparatus capable of performing a bidirectional printing for printing an image on a print medium by ejecting ink from a print head in which a plurality of nozzles are arranged during forward and backward movements of the print head, said apparatus comprising:

  • an executing unit capable of executing at least a first print mode for performing the bidirectional printing in accordance with a first mask pattern by M movements (M is an odd number equal 3 or more) between which the print medium is conveyed by a first conveying distance smaller than a length of a region on which the plurality of nozzles are arranged, and a second print mode for performing the bidirectional printing in accordance with a second mask pattern by N movements (N is an odd number larger than M) between which the print medium is conveyed by a second conveying distance smaller than the first conveying distance,wherein a difference between a maximum value and a minimum value of print permitted ratios, defined by the first mask pattern, for the M movements is larger than a difference between a maximum value and a minimum value of print permitted ratios, defined by the second mask pattern, for the N movements.

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