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:
Mar. 31, 2015
Filed:
Mar. 25, 2013
Fuji Xerox Co., Ltd., Tokyo, JP;
Akihisa Maruyama, Kanagawa, JP;
Toshihiro Kanematsu, Kanagawa, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
A developing device includes a developing member including a magnet member on which plural magnetic poles including a developing main magnetic pole are magnetized in a circumferential direction and a developer holder that faces an image supporting member, receives the magnet member, and holds a developer, wherein a distribution of a magnetic attraction force in a circumferential direction has a gradient that increases toward a downstream end from an upstream end of a developing area in a developer transport direction of the developer holder, and the magnetic poles are magnetized on the magnet member so that the amount of the increase of the magnetic attraction force between the upstream end and a middle position of the developing area is larger than that between the middle position and the downstream end.