发明授权
- 专利标题： Charging device, process cartridge and image forming apparatus
- 专利标题（中）： 充电装置，处理盒和成像装置
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申请号： US09981810申请日： 2001-10-19
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公开(公告)号： US06553199B2公开(公告)日： 2003-04-22
- 发明人: Harumi Ishiyama , Yasunori Chigono , Jun Hirabayashi
- 申请人： Harumi Ishiyama , Yasunori Chigono , Jun Hirabayashi
- 优先权： JP2000-321196 20001020
- 主分类号： G03G1500
- IPC分类号： G03G1500
摘要：
A charging device, suitable for use in an electrophotographic image forming apparatus, is formed of an object to be charged, and a roller-shaped charging member disposed in contact with the object via electroconductive particles and supplied with a voltage to charge the objects. The charging member has a surface layer including an elastic foam and is moved with a surface speed difference relative to the object. The charging member has surface cavities having an average diameter of 5 to 150 &mgr;m and occupying an area percentage of 50 to 90%. An image forming apparatus and a process cartridge therefor including the charging device are also provided.