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:
May. 20, 2008
Filed:
Jan. 19, 2006
Kazuhiko Kobayashi, Tokyo, JP;
Hiromichi Matsuda, Kanagawa, JP;
Toshiyuki Andoh, Kanagawa, JP;
Nobuto Yokokawa, Kanagawa, JP;
Ryoji Imai, Kanagawa, JP;
Yuji Matsuda, Tokyo, JP;
Hiroshi Okamura, Kanagawa, JP;
Masato Yokoyama, Kanagawa, JP;
Yohei Miura, Tokyo, JP;
Kazuhiko Kobayashi, Tokyo, JP;
Hiromichi Matsuda, Kanagawa, JP;
Toshiyuki Andoh, Kanagawa, JP;
Nobuto Yokokawa, Kanagawa, JP;
Ryoji Imai, Kanagawa, JP;
Yuji Matsuda, Tokyo, JP;
Hiroshi Okamura, Kanagawa, JP;
Masato Yokoyama, Kanagawa, JP;
Yohei Miura, Tokyo, JP;
Ricoh Company, Limited, Tokyo, JP;
Abstract
A mark detecting unit detects a mark that is a reference position of an endless belt. An angular-displacement-error detecting unit detects an angular displacement error of an encoder caused by thickness fluctuation of the endless belt. A first calculating unit calculates a phase and a maximum amplitude to the mark. A second calculating unit calculates correction data according to a distance from the mark on the endless belt. A belt-drive control device controls a belt driving unit by adding the correction data to a preset control target value to stabilize speed fluctuation of the endless belt due to the thickness fluctuation.