发明授权
US5348829A Monocomponent-type developer for developing electrostatic image and
image forming method
失效
用于显影静电图像和图像形成方法的单组分型显影剂
- 专利标题: Monocomponent-type developer for developing electrostatic image and image forming method
- 专利标题(中): 用于显影静电图像和图像形成方法的单组分型显影剂
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申请号: US972540申请日: 1992-11-06
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公开(公告)号: US5348829A公开(公告)日: 1994-09-20
- 发明人: Masaki Uchiyama , Yasutaka Akashi , Masaaki Taya , Makoto Unno
- 申请人: Masaki Uchiyama , Yasutaka Akashi , Masaaki Taya , Makoto Unno
- 申请人地址: JPX Tokyo
- 专利权人: Canon Kabushiki Kaisha
- 当前专利权人: Canon Kabushiki Kaisha
- 当前专利权人地址: JPX Tokyo
- 优先权: JPX3-293034 19911108
- 主分类号: G03G9/08
- IPC分类号: G03G9/08 ; G03G9/097 ; G03G13/09 ; G03G9/083
摘要:
A monocomponent-type developer for developing electrostatic images, includes a magnetic toner containing at least a binder resin and magnetic powder, and 0.5-10 wt. % (based on the magnetic toner) of inorganic fine powder having a length-average particle size of 0.1-5 .mu.m. The developer has a number-basis particle size distribution such that particles of 4 .mu.m or smaller are contained at 5-18% by number and particles of 4-10 .mu.m are contained at at least 60% by number. The developer has a volume basis particle size distribution such that particles of 12.7 .mu.m or larger are contained at at most 10% by volume. The developer has a weight-average particle size of 7-11 .mu.m. The developer is particularly useful for development under application of a DC-superposed asymmetric AC bias electric field including a development-side voltage component with a larger magnitude and a shorter duration than a reverse development-side voltage component.
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