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:
Nov. 03, 2015
Filed:
Aug. 05, 2014
Toshio Koike, Tokyo, JP;
Kiyonori Tsuda, Kanagawa, JP;
Yutaka Takahashi, Kanagawa, JP;
Yuichi Aizawa, Ibaraki, JP;
Keinosuke Kondoh, Kanagawa, JP;
Kentaro Mikuniya, Tokyo, JP;
Toshio Koike, Tokyo, JP;
Kiyonori Tsuda, Kanagawa, JP;
Yutaka Takahashi, Kanagawa, JP;
Yuichi Aizawa, Ibaraki, JP;
Keinosuke Kondoh, Kanagawa, JP;
Kentaro Mikuniya, Tokyo, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A developing device includes a developer bearer to carry, by rotation, developer including toner and magnetic carrier to a development range facing a latent image bearer, and the developer bearer includes a magnetic field generator having multiple magnetic poles and a cylindrical developing sleeve to rotate and bear developer on an outer circumferential face thereof with magnetic force of the magnetic field generator provided inside the developing sleeve. The developing sleeve receives developing bias voltage including an AC component, and includes a base to maintain a cylindrical shape of the developing sleeve and a low friction surface layer including a material lower in friction coefficient with toner than a material of the base.