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:
Oct. 12, 2010
Filed:
Mar. 05, 2009
Katsumi Masuda, Kanagawa, JP;
Yoshio Hattori, Kanagawa, JP;
Hiroyuki Uenishi, Kanagawa, JP;
Yuji Suzuki, Tokyo, JP;
Takamasa Ozeki, Kanagawa, JP;
Katsumi Masuda, Kanagawa, JP;
Yoshio Hattori, Kanagawa, JP;
Hiroyuki Uenishi, Kanagawa, JP;
Yuji Suzuki, Tokyo, JP;
Takamasa Ozeki, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
To downsize a developing device in the developing carrier axial direction without generating image concentration irregularities from recirculation of developer in the magnetic roller end regions, an Npole and an Npole, which are mutually adjacent having the same polarity (N polarity), and which are for generating a magnetic force for removing from a developing sleeve a developer that has passed through a developing region, are provided on a magnetic roller. Magnets of this developing device, which are for generating a magnetic field to displace to the inside in the axial direction magnetic force lines that cause peeling force in the direction of separation from the developing sleeve to act on developer on the developing sleeve, based on the magnetic force of the Npole and the Npole, and that pass through the axial direction end regions within a developer separation region on the developing sleeve, are provided on the outside of the magnetic roller.