发明公开
EP0580135A1 Carrier for use in electrophotography, two component-type developer and image forming method
失效
Trägerteilchenfürdie Elektrophotographie，Zweikomponentententententlerler und Bildherstellungsverfahren。
- 专利标题： Carrier for use in electrophotography, two component-type developer and image forming method
- 专利标题（中）： Trägerteilchenfürdie Elektrophotographie，Zweikomponentententententlerler und Bildherstellungsverfahren。
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申请号： EP93111663.6申请日： 1993-07-21
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公开(公告)号： EP0580135A1公开(公告)日： 1994-01-26
- 发明人: Baba, Yoshinobu , Ikeda, Takeshi , Amano, Yasuko , Itabashi, Hitoshi
- 申请人： CANON KABUSHIKI KAISHA
- 申请人地址： 30-2, 3-chome, Shimomaruko, Ohta-ku Tokyo JP
- 专利权人： CANON KABUSHIKI KAISHA
- 当前专利权人： CANON KABUSHIKI KAISHA
- 当前专利权人地址： 30-2, 3-chome, Shimomaruko, Ohta-ku Tokyo JP
- 代理机构： Tiedtke, Harro, Dipl.-Ing.
- 优先权： JP195501/92 19920722; JP195505/92 19920722; JP195506/92 19920722; JP201394/92 19920728
- 主分类号： G03G9/107
- IPC分类号： G03G9/107
摘要：
A two component-type developer for electrophotography showing improved electrophotographic performances and also free from carrier adhesion (undesirable carrier transfer to the photosensitive member and recording materials) is constituted by using a magnetic carrier of 5 - 100 µm in particle size. The carrier has a bulk density of at most 30 g/cm³, and magnetic properties including: a magnetization of 30 - 150 emu/cm³ under a magnetic field strength of 1000 oersted, a magnetization (residual magnetization σ r ) of at least 25 emu/cm³ under a magnetic field strength of zero oersted, a coercive force of less than 300 oersted, and a relationship of:
|σ₁₀₀₀-σ₃₀₀|/σ₁₀₀₀ ≦ 0.40
wherein σ₁₀₀₀ and σ₃₀₀ denote magnetizations under magnetic field strength of 1000 oersted and 300 oersted, respectively.
|σ₁₀₀₀-σ₃₀₀|/σ₁₀₀₀ ≦ 0.40
wherein σ₁₀₀₀ and σ₃₀₀ denote magnetizations under magnetic field strength of 1000 oersted and 300 oersted, respectively.
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