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:
Jun. 01, 2010
Filed:
Oct. 04, 2006
Kazuhiko Kobayashi, Tokyo, JP;
Joh Ebara, Kanagawa, JP;
Yasuhisa Ehara, Kanagawa, JP;
Noriaki Funamoto, Tokyo, JP;
Toshiyuki Uchida, Kanagawa, JP;
Seiichi Handa, Tokyo, JP;
Yuji Matsuda, Tokyo, JP;
Kazuhiko Kobayashi, Tokyo, JP;
Joh Ebara, Kanagawa, JP;
Yasuhisa Ehara, Kanagawa, JP;
Noriaki Funamoto, Tokyo, JP;
Toshiyuki Uchida, Kanagawa, JP;
Seiichi Handa, Tokyo, JP;
Yuji Matsuda, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A color-drift correcting method in an image forming apparatus includes a first and a second color-drift correcting. The first color-drift correcting includes correcting the color-drift amount in a sub scanning direction and a skew relative to the reference color image being based on each color-drift amount of at least three mark-patterns, each of which mark-pattern is formed each color image, so as to decide a corrected-image line as a virtual image line for each color, assumed when the color images are superposed onto a transfer media. A second color-drift correcting includes correcting the color-drift amount in the sub scanning direction so that the virtual image lines corresponding to each of the colors other than the reference color intersect with the virtual image line of the reference color at at least two points.