US Patent No. 9,266,346

COLOR MIXING DETECTION METHOD, COLOR MIXING DETECTION APPARATUS, AND PRINTING APPARATUS FOR INKJET PRINTING HEAD


Patent No. 9,266,346
Issue Date February 23, 2016
Title Color Mixing Detection Method, Color Mixing Detection Apparatus, And Printing Apparatus For Inkjet Printing Head
Inventorship Tetsuro Yasukawa, Ichikawa (JP)
Assignee CANON KABUSHIKI KAISHA, Tokyo (JP)

Claim of US Patent No. 9,266,346

1. A method for detecting an occurrence of a color mixing of ink in an inkjet printing head that can eject at least first
and second inks having different colors, comprising:
a printing step of allowing the printing head and a printing medium to move relative to each other in a first direction while
allowing the first ink to be ejected through the printing head so that an inspection pattern having a uniform density is printed
on the printing medium by the first ink;

a density measurement step of measuring a density of a printed image of the inspection pattern; and
a detection step of detecting the occurrence of the color mixing of the first and second inks when a density-changed part
in the printed image in which the density measured by the density measurement step deviates from an allowable density continuously
extends in the first direction for a predetermined range or more.