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. 29, 2010
Filed:
Nov. 10, 2006
Shinji Kato, Kanagawa, JP;
Shin Hasegawa, Kanagawa, JP;
Kohta Fujimori, Kanagawa, JP;
Nobutaka Takeuchi, Kanagawa, JP;
Kayoko Tanaka, Tokyo, JP;
Yushi Hirayama, Kanagawa, JP;
Kazumi Kobayashi, Tokyo, JP;
Kiichirou Shimizu, Kanagawa, JP;
Takashi Enami, Kanagawa, JP;
Shinji Kato, Kanagawa, JP;
Shin Hasegawa, Kanagawa, JP;
Kohta Fujimori, Kanagawa, JP;
Nobutaka Takeuchi, Kanagawa, JP;
Kayoko Tanaka, Tokyo, JP;
Yushi Hirayama, Kanagawa, JP;
Kazumi Kobayashi, Tokyo, JP;
Kiichirou Shimizu, Kanagawa, JP;
Takashi Enami, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An image forming apparatus in which a predetermined image density can be obtained by correcting a toner density control target value without consuming toner. The toner density of the developer is controlled so that an output value Vt of a magnetic permeability sensor approaches a target output value Vt. In addition, the target output value Vtis corrected in accordance with image coverage history information of output images transferred to a transfer paper and image coverage ratio history information of output images determined from the image coverage thereof and the size of the transfer paper. This history information comprises, for example, a cumulative average value of the image coverage or the image coverage ratio per transfer paper. It may also comprise a moving average value of the image coverage or the image coverage ratio per transfer material.