The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 21, 2009
Filed:
Oct. 04, 2000
Kiichiro Takahashi, Kawasaki, JP;
Naoji Otsuka, Yokohama, JP;
Hitoshi Sugimoto, Yokohama, JP;
Hitoshi Nishikori, Inagi, JP;
Osamu Iwasaki, Tokyo, JP;
Kaneji Yamada, Tokyo, JP;
Minoru Teshigawara, Yokohama, JP;
Takeshi Yazawa, Kawasaki, JP;
Toshiyuki Chikuma, Kawasaki, JP;
Kiichiro Takahashi, Kawasaki, JP;
Naoji Otsuka, Yokohama, JP;
Hitoshi Sugimoto, Yokohama, JP;
Hitoshi Nishikori, Inagi, JP;
Osamu Iwasaki, Tokyo, JP;
Kaneji Yamada, Tokyo, JP;
Minoru Teshigawara, Yokohama, JP;
Takeshi Yazawa, Kawasaki, JP;
Toshiyuki Chikuma, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In a printer, when difference in ejection characteristic among nozzles appears as density non-uniformity and the way of letting the density non-uniformity appear is different depending upon kind of image, proper density correction is performed. Specifically, the kind of image to be printed is judged, and when the kind of image is a halftone image according to the judgment, a density correction table corresponding to the halftone image is selected and used to perform the density correction. Also when the kind of image is judged to be a solid image (without a portion of the halftone image), a proper table is selected similarly and used to perform the density correction.