发明授权
- 专利标题: Image forming apparatus, process cartridge and toner
- 专利标题(中): 成像设备,处理盒和调色剂
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申请号: EP08162828.1申请日: 2008-08-22
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公开(公告)号: EP2028567B1公开(公告)日: 2018-04-11
- 发明人: Katoh, Hiroaki , Nakatake, Naoki , Yasunaga, Hideaki , Fuwa, Kazuoki , Mikuriya, Yoshihiro , Hagi, Masayuki
- 申请人: Ricoh Company, Ltd.
- 申请人地址: 3-6, Nakamagome 1-chome Ohta-ku Tokyo 143-8555 JP
- 专利权人: Ricoh Company, Ltd.
- 当前专利权人: Ricoh Company, Ltd.
- 当前专利权人地址: 3-6, Nakamagome 1-chome Ohta-ku Tokyo 143-8555 JP
- 代理机构: Held, Stephan
- 优先权: JP2007217151 20070823
- 主分类号: G03G21/00
- IPC分类号: G03G21/00
摘要:
An image forming apparatus including an image bearing member (2K) including a tube, the image bearing member (2K) to bear a latent electrostatic image, a development device (5K) including a pulverized toner including a resin, a coloring agent and a releasing agent component, the development device (5K) to develop the latent electrostatic image with the toner to form a visualized image on the image bearing member (2K), a transfer device (20) to transfer the visualized image to a recording medium (P), a fixing device (34) including a fixing member (34a), the fixing device (34) to fix the visualized image on the recording medium and an elastic blade (308K) to remove the toner on the surface of the image bearing member (2K), wherein the toner has a void ratio of from 52 to 58 % and a toner torque of from 1.0 to 2.5 mNm according to a torque measuring method using a circular conical rotor and the following relationships 1 to 4 are satisfied: 45 ‰¤ WA ‰¤ 60 2 × WA - 40 ‰¤ 50 × T ‰¤ 2 × WA + 5 1.2 ‰¤ t ‰¤ 2.0 40 × T - 70 ‰¤ 15 × t ‰¤ 40 × T - 22 where WA, expressed in %, represents a surface exposure amount of the releasing agent component of the toner, T, expressed in mNm, represents the toner torque at 58 % of the void ratio and t, expressed in mm, represents a thickness of the tube.
公开/授权文献
- EP2028567A1 Image forming apparatus, process cartridge and toner 公开/授权日:2009-02-25
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