Invention Grant
- Patent Title: Development device, process cartridge incorporating same, and image forming apparatus incorporating same
- Patent Title (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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Application No.: US13225905Application Date: 2011-09-06
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Publication No.: US08824935B2Publication Date: 2014-09-02
- Inventor: Hideyasu Seki , Yasuyuki Ishii , Hideki Kosugi , Tetsuro Hirota , Masaaki Yamada , Atsushi Kurokawa
- Applicant: Hideyasu Seki , Yasuyuki Ishii , Hideki Kosugi , Tetsuro Hirota , Masaaki Yamada , Atsushi Kurokawa
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2010-203479 20100910
- Main IPC: G03G15/08
- IPC: G03G15/08

Abstract:
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.
Public/Granted literature
- US20120063815A1 DEVELOPMENT DEVICE, PROCESS CARTRIDGE INCORPORATING SAME, AND IMAGE FORMING APPARATUS INCORPORATING SAME Public/Granted day:2012-03-15
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