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:
Feb. 23, 2016
Filed:
May. 01, 2015
Canon Kabushiki Kaisha, Tokyo, JP;
Osamu Ariizumi, Matsudo, JP;
Takanori Iida, Noda, JP;
Shinya Suzuki, Abiko, JP;
Ryohei Terada, Nagareyama, JP;
Ichiro Katsuie, Takasaki, JP;
Shoji Naruge, Kashiwa, JP;
Masahiro Ootsuka, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A development device wherein a magnetic force distribution of a developer bearing member in a longitudinal direction at positions at which a magnetic flux density of a low magnetic field area is minimal in the peripheral direction of the developer bearing member is set such that a difference between a maximum magnetic flux density in a range from a maximum position at which an attenuation rate of the magnetic flux density is maximal to a 30 mm distant position toward the center of the developer bearing member and a magnetic flux density on a further center side of the developer bearing member than the range is 3 mT or less, and an absolute value of the magnetic flux density of a further outer side in the longitudinal direction of the developer bearing member than the maximum position is set to 3 mT or less.