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. 13, 2008
Filed:
Apr. 13, 2005
Tadashi Shinohara, Yokohama, JP;
Masata Yokoyama, Yokohama, JP;
Kazuhiko Kobayashi, Tokyo, JP;
Yohei Miura, Tokyo, JP;
Toshiyuki Yakahashi, Kawasaki, JP;
Yuji Matsuda, Tokyo, JP;
Jun Hosokawa, Tokyo, JP;
Nobuto Yokokawa, Kawaguchi, JP;
Toshiyuki Andoh, Sagamihara, JP;
Tadashi Shinohara, Yokohama, JP;
Masata Yokoyama, Yokohama, JP;
Kazuhiko Kobayashi, Tokyo, JP;
Yohei Miura, Tokyo, JP;
Toshiyuki Yakahashi, Kawasaki, JP;
Yuji Matsuda, Tokyo, JP;
Jun Hosokawa, Tokyo, JP;
Nobuto Yokokawa, Kawaguchi, JP;
Toshiyuki Andoh, Sagamihara, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A color image forming apparatus including a plurality of photosensitive drums on which toner images of different colors are respectively formed. An endless belt confronts the plurality of photosensitive drums. A drive source drives rotation of the endless belt, or alternatively plural drive sources drive the photosensitive drums to individually rotate. A memory stores pre-measured characteristics of a color misregistration of a color image in a sub-scanning direction of the apparatus, the color image formed by transferring images from respective of the plurality of photosensitive drums. Further, a control unit changes an average running speed of the endless belt, or alternatively an average running speed of at least some of the photosensitive drums, by controlling the drive sources, to compensate for color misregistration, based on the stored characteristics of color misregistration. The belt can either transport a paper sheet or have a color image formed thereon as an intermediate transfer device.