发明授权
- 专利标题: Development device, process cartridge incorporating same, and image forming apparatus incorporating same
- 专利标题(中): 显影装置,结合其的处理盒,以及包含其的图像形成装置
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申请号: US13225905申请日: 2011-09-06
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公开(公告)号: US08824935B2公开(公告)日: 2014-09-02
- 发明人: Hideyasu Seki , Yasuyuki Ishii , Hideki Kosugi , Tetsuro Hirota , Masaaki Yamada , Atsushi Kurokawa
- 申请人: Hideyasu Seki , Yasuyuki Ishii , Hideki Kosugi , Tetsuro Hirota , Masaaki Yamada , Atsushi Kurokawa
- 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: JP2010-203479 20100910
- 主分类号: G03G15/08
- IPC分类号: G03G15/08
摘要:
A development device includes a developer container; a rotary cylindrical developer carrier including an outer electrode including multiple electrode portions arranged in a circumferential direction of the developer carrier, an inner electrode provided on an inner circumferential side of the developer carrier from the outer electrode, an insulation layer disposed between the outer electrode and the inner electrode, and a surface layer; and a bias power source to apply a first bias voltage and a second bias voltage to the inner electrode and the outer electrode, respectively. The first bias power source causes an electrical potential difference that changes with time between the inner electrode and the outer electrode to cause the developer to hop on a circumferential surface of the developer carrier. At least one of the first bias voltage and the second bias voltage has a cyclic waveform in which pulse-on time is reduced.
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