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. 17, 2009
Filed:
Apr. 06, 2007
Ichiro Kawahara, Saitama, JP;
Takafumi Wakai, Niigata, JP;
Ichiro Kawahara, Saitama, JP;
Takafumi Wakai, Niigata, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
A developing device comprises: a case having a developing opening; a cylindrical-shaped developer carry member disposed exposed in part to the developing opening, and rotatable for holding and carrying a developer; and a magnet member disposed fixed within the developer carry member and comprising two or more magnetic poles including a developing magnetic pole and a developer peel-off magnetic pole. In such portion of the case that not only is opposed to the outer peripheral surface of the developer carry member after it passes through the developing area but also corresponds to an area which extends from the developing magnetic pole in the rotation direction up to the developer peel-off magnetic pole and provides a normal direction magnetic flux density of 20 mT or less, a projecting portion where a clearance between its opposed portion and the outer peripheral surface of the developer carry member becomes narrowest is formed.