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:
Mar. 23, 2010
Filed:
Nov. 16, 2005
Tsutomu Takata, Yokohama, JP;
Hiroki Kitamura, Kawasaki, JP;
Yoshiyuki Akiba, Yokohama, JP;
Shuichi Nakamura, Kawasaki, JP;
Yusuke Yamamoto, Tokyo, JP;
Masanao Motoyama, Tokyo, JP;
Takeshi Akiyama, Tokyo, JP;
Kenzo Tojima, Tokyo, JP;
Takaaki Nagaoka, Hadanoshi, JP;
Tsutomu Takata, Yokohama, JP;
Hiroki Kitamura, Kawasaki, JP;
Yoshiyuki Akiba, Yokohama, JP;
Shuichi Nakamura, Kawasaki, JP;
Yusuke Yamamoto, Tokyo, JP;
Masanao Motoyama, Tokyo, JP;
Takeshi Akiyama, Tokyo, JP;
Kenzo Tojima, Tokyo, JP;
Takaaki Nagaoka, Hadanoshi, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image forming engine has color shifting amount storage units C, M, Y, and K (black) which store actual shifting amounts relative to ideal scan directions on image carriers C, M, Y, and K in image forming units C, M, Y, and K. Color shifting correction amount arithmetic units calculate color shifting correction amounts for respective color components to base on the stored color shifting amounts. Color shifting correction units C, M, Y, and K perform color shifting correction by converting coordinates upon reading out image data from bitmap memories C, M, Y, and K on the basis of the calculated color shifting correction amounts, and then perform tone correction. Data after tone correction undergo halftone processing by halftone processors. C, M, Y, and K to suppress moire. PWM processors C, M, Y, and K generate PWM signals for scanning, and output them to exposure units C, M, Y, and K of the respective image forming units.