发明授权
- 专利标题： Development device, and process cartridge and image forming apparatus incorporating same
- 专利标题（中）： 开发装置，以及包含其的处理盒和图像形成装置
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申请号： US13019610申请日： 2011-02-02
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公开(公告)号： US08824932B2公开(公告)日： 2014-09-02
- 发明人: Katsumi Masuda , Takamasa Ozeki , Nobuyuki Taguchi , Yuuki Satoh , Toshiki Hayashi , Kyohta Koetsuka , Toshio Kojima , Masayuki Ohsawa , Noriyuki Kamiya , Takumi Terasaka
- 申请人： Katsumi Masuda , Takamasa Ozeki , Nobuyuki Taguchi , Yuuki Satoh , Toshiki Hayashi , Kyohta Koetsuka , Toshio Kojima , Masayuki Ohsawa , Noriyuki Kamiya , Takumi Terasaka
- 申请人地址： JP Tokyo
- 专利权人： Ricoh Company, Ltd.
- 当前专利权人： Ricoh Company, Ltd.
- 当前专利权人地址： JP Tokyo
- 代理机构： Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- 优先权： JP2010-027208 20100210; JP2010-036809 20100223
- 主分类号： G03G15/08
- IPC分类号： G03G15/08 ; G03G15/09
摘要：
A development device includes a developer container, a developer carrier, exposed partly from a casing, facing a latent image carrier in a development area, a magnetic field generator inside the developer carrier, having multiple magnetic poles including a conveyance pole to convey the developer downstream from the development area to a developer release portion, a developer agitator, and a developer regulator. A predetermined gap is kept between an outer surface of the developer carrier and an inner wall of the casing downstream from an opening of the casing, upstream from a developer release portion, in a direction in which the developer carrier rotates. Multiple recesses are formed in the outer surface of the developer carrier at a pitch in a circumferential direction shorter than half a width of a magnetic flux density of the developer conveyance pole in a direction perpendicular to an axial direction of the developer carrier.