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:
Dec. 11, 2012
Filed:
Mar. 26, 2009
Kyohta Koetsuka, Fujisawa, JP;
Masayuki Ohsawa, Atsugi, JP;
Yoshiyuki Takano, Haochioji, JP;
Katsumi Masuda, Yokohama, JP;
Yoshio Hattori, Kawasaki, JP;
Yuji Suzuki, Tokyo, JP;
Takamasa Ozeki, Yokohama, JP;
Hiroyuki Uenishi, Yokohama, JP;
Kyohta Koetsuka, Fujisawa, JP;
Masayuki Ohsawa, Atsugi, JP;
Yoshiyuki Takano, Haochioji, JP;
Katsumi Masuda, Yokohama, JP;
Yoshio Hattori, Kawasaki, JP;
Yuji Suzuki, Tokyo, JP;
Takamasa Ozeki, Yokohama, JP;
Hiroyuki Uenishi, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A developing unit includable in a process cartridge and in an image forming apparatus includes a developer bearing member including a magnetic field generator and a nonmagnetic hollow member, a developer container, an agitation/conveyance member, and a developer regulating member. The magnetic field generator has first and second magnetic poles to generate respective magnetic forces for removing the developer from the developer bearing member after the developer passes the development region. A developer-releasing region releases the developer from the developer bearing member using a release force. The developer is disposed higher than a surface of the developer in the developer storing chamber. A component of a magnetic flux density of the magnetic field generated by the magnetic field generator in a direction normal to the developer-releasing region is directed to a same direction as the first and second magnetic poles across the developer-releasing region without forming a local maximum point.