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. 04, 2001
Filed:
Sep. 08, 1999
Kimiyuki Hayasaki, Yokohama, JP;
Koji Yamakawa, Yokohama, JP;
Yutaka Koizumi, Yokohama, JP;
Tsuyoshi Orikasa, Musashimurayama, JP;
Hiroyuki Kigami, Ebina, JP;
Hisashi Fukai, Yokohama, JP;
Takayuki Ono, Kawasaki, JP;
Masayoshi Ohkawa, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An apparatus and method for accurately and rapidly correcting a printing characteristic of a printhead, a printhead whose printing characteristic is corrected by the above apparatus, and a printing apparatus using the printhead. In the apparatus for correcting the printing characteristic of the printhead, n kinds of printing control signal patterns are used to a full line printhead, printing patterns are experimentally printed in response to the printing control signal patterns on a printing medium and a reference density distribution is generated from one of n kinds of the printing patterns printed. Then, one of the n kinds of printing control signal patterns is selected for each of a plurality of printing elements such that a density value on each pixel is equal or close to the reference density distribution. In this case, a similar selection is carried out on another reference density distribution generated on the basis of another one of the n kinds of printing patterns, and an optimum one of the n kinds of printing control signal patterns is determined as correction data.