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:
Sep. 14, 2010
Filed:
Jun. 17, 2009
Takuma Matsuda, Suntou-gun, JP;
Masayoshi Shimamura, Yokohama, JP;
Yasutaka Akashi, Yokohama, JP;
Satoshi Otake, Numazu, JP;
Minoru Ito, Susono, JP;
Kazuhito Wakabayashi, Mishima, JP;
Daisuke Yoshiba, Suntou-gun, JP;
Takuma Matsuda, Suntou-gun, JP;
Masayoshi Shimamura, Yokohama, JP;
Yasutaka Akashi, Yokohama, JP;
Satoshi Otake, Numazu, JP;
Minoru Ito, Susono, JP;
Kazuhito Wakabayashi, Mishima, JP;
Daisuke Yoshiba, Suntou-gun, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A developing apparatus is provided which can suppress a fluctuation in image density in a discontinuous printing mode provided with a pause period. The developing apparatus includes a developer for developing an electrostatic latent image on a photosensitive drum, a developer bearing member for carrying and conveying the developer and a developer layer thickness-regulating unit placed close to the developer bearing member for regulating the amount of the developer carried and conveyed by the developer bearing member, the developer layer thickness-regulating unit being. As the developer, a negatively chargeable, one-component, magnetic toner is used having magnetic toner particles containing a binder resin and a magnetic iron oxide particle, and has a specific saturation magnetization, specific weight-average particle diameter and specific composition. The developer bearing member includes a surface layer containing a binder resin, a quaternary ammonium salt, graphitized particles, and conductive, spherical resin particles, and has a specific surface shape.