Invention Grant
- Patent Title: Developing apparatus and image forming apparatus using same
- Patent Title (中): 显影装置和使用它的成像装置
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Application No.: US11622282Application Date: 2007-01-11
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Publication No.: US07792472B2Publication Date: 2010-09-07
- Inventor: Tomoyuki Ichikawa , Junichi Matsumoto , Nobuo Iwata , Natsumi Katoh
- Applicant: Tomoyuki Ichikawa , Junichi Matsumoto , Nobuo Iwata , Natsumi Katoh
- 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: JP2006-006820 20060113; JP2006-019678 20060127; JP2006-118562 20060421; JP2006-275106 20061006
- Main IPC: G03G15/09
- IPC: G03G15/09

Abstract:
A developing apparatus using a two-component developer constituted by a magnetic carrier and a toner, and an image forming apparatus comprising the developing apparatus. A developing unit and a stirring unit are provided, and in order to suppress toner scattering that may occur after a development operation has been halted for a long time, and thereby suppress contamination of the apparatus interior, the developer in a developing machine is transferred to a stirrer serving as a developer storage unit on the exterior of the developing machine when the development operation ends. Further, to extend the life of the developer, a range in which an angle of a restricting member upstream side central angle α, which is a central angle of the surface of a developing roller serving as a developer carrier on the upstream side of a restricting member opposing position opposing a doctor blade serving as a developer amount restricting member in a surface motion direction of the developing roller, is not less than 0[°] and not more than 60[°] is set as a low magnetic flux density area γ in which the maximum value of a normal direction magnetic flux density on the surface of the developing roller is not more than 30 [mT].
Public/Granted literature
- US20070166079A1 DEVELOPING APPARATUS AND IMAGE FORMING APPARATUS USING SAME Public/Granted day:2007-07-19
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