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. 28, 2014
Filed:
Oct. 19, 2011
Akihiro Noguchi, Toride, JP;
Katsuya Nose, Matsudo, JP;
Asuna Fukamachi, Kashiwa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A developing device includes a developer carrying member for carrying developer containing a non-magnetic toner and a magnetic carrier to a position where the developer carrying member is opposed to an image bearing member, and a developing container including a first chamber for accommodating the developer to be supplied to the developer carrying member, a second chamber provided below the first chamber, and an opening for circulating the developer between the first chamber and the second chamber. In addition, a first feeding member and a second feeding member are rotatably provided in the first chamber and the second chamber, respectively, for stirring and feeding the developer. A first magnet member of the first feeding member and a second magnet member of the second feeding member are provided so that same magnetic polarity portions are opposed to each other or so that a ratio of a range in which the same magnetic polarity portions are opposed to each other is greater than a ratio of a range in which opposite magnetic polarity portions are opposed to each other.