Invention Grant
- Patent Title: Magnetic particle carrying device, and developing unit, process cartridge, and image forming apparatus using the same, and surface treatment method of the same
- Patent Title (中): 磁粉承载装置，显影单元，处理盒及使用其的成像装置及其表面处理方法
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Application No.: US12013143Application Date: 2008-01-11
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Publication No.: US07899374B2Publication Date: 2011-03-01
- Inventor: Hiroya Abe , Tsuyoshi Imamura , Kyohta Koetsuka , Tadaaki Hattori , Yoshiyuki Takano , Noriyuki Kamiya , Masayuki Ohsawa , Mieko Terashima , Takashi Innami
- Applicant: Hiroya Abe , Tsuyoshi Imamura , Kyohta Koetsuka , Tadaaki Hattori , Yoshiyuki Takano , Noriyuki Kamiya , Masayuki Ohsawa , Mieko Terashima , Takashi Innami
- 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: JP2007-003425 20070111; JP2007-113883 20070424
- Main IPC: G03G15/09
- IPC: G03G15/09
Abstract:
A magnetic particle carrying device includes a magnetic field generator and a hollow cylindrical structure. The magnetic field generator generates a magnetic field. The hollow cylindrical structure encases the magnetic field generator and attracts magnetic particles on an external surface of the hollow structure using the magnetic field. The external surface of the hollow cylindrical structure is provided with a plurality of elliptical depressions. The depressions include first type depressions and second type depressions. A long axis of a first type of elliptical depression is substantially extending in an axial direction of the hollow cylindrical structure, and a long axis of a second type of elliptical depression is substantially extending in a circumferential direction of the hollow cylindrical structure. The external surface of the hollow cylindrical structure has more elliptical depressions of the second type than elliptical depressions of the first type.
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