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:
Dec. 21, 2004
Filed:
Oct. 04, 2000
Hitoshi Nishikori, Inagi, JP;
Naoji Otsuka, Yokohama, JP;
Hitoshi Sugimoto, Yokohama, JP;
Kiichiro Takahashi, Kawasaki, 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
An apparatus and method capable of obtaining an output characteristic of the print unit and determining a correction value for an output density, without using an expensive scanner. To realize this, a nozzle array consisting of a plurality of nozzles provided in the print head is divided into a plurality of nozzle blocks [a] to [d] and each of patches is formed by using the nozzles of the same nozzle block allocated to the patch. The patches are printed in a size and shape that allows the densities of the patches to be optically detected by the density sensor. A test pattern comprising these patches is measured by the density sensor to make a density correction for each nozzle of the print head.