IP Library › Granted Patent US 7,011,391
Granted Patent B2
US 7,011,391 · App. 10/941,827 · Granted Mar 14, 2006

Bidirectional printing method and apparatus with reduced color unevenness

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Quick Facts
Patent No.
US 7,011,391
App. No.
10/941,827
Granted
Mar 14, 2006
Kind
B2
Abstract

A printing apparatus, which forms a color image by applying different color inks to a printing material while bi-directionally moving the recording head to scan the recording material, includes a changing unit for changing an order of applications of the inks of different colors to be applied at least at one amount for printing a secondary color to a secondary color pixel area; and a forming unit for forming the secondary color while making the order of applications of the inks to at least one of a plurality of the secondary color pixel areas arranged along a predetermined direction different from the order of another, by the changing unit.

Claims (6)

1. A printing apparatus, for forming a color image by applying different color inks to a printing material while bi-directionally moving a recording head to scan the printing material, said apparatus comprising:

control means for effecting recording by application of ink for each pixel area as a unit, the pixel area representing a primary or secondary color, said control means being effective to control a number of ink droplets of each color applied to each pixel area and an amount of the ink applied by a unit application of the ink;

changing means for changing an order of applications of the inks of different colors to be applied at least at one amount for printing the secondary color to a secondary color pixel area; and

forming means for forming the secondary color while making the order of applications of the inks to at least one of a plurality of the secondary color pixel areas arranged along a predetermined direction different from the order of another, by said changing means,

wherein dots of different colors applied to the pixel area are at least partly overlapped with each other.

2. An apparatus according to claim 1 , wherein the recording head ejects the ink by heat.