发明名称 DEVELOPING ROLLER AND DEVELOPING DEVICE
摘要 PROBLEM TO BE SOLVED: To reduce a manufacturing cost with a simple structure and to obtain sufficient magnetic force by constituting a developing roller of a core bar and an elastic layer provided on the outside peripheral part of the core bar and mixing an elastic material with a magnetic material, so that the elastic layer is formed. SOLUTION: The developing roller 20 attracting one component magnetic toner with magnetic force is formed of the core bar 22 formed of metal, and the elastic layer 23 fixed to the outside peripheral part of the core bar 22. The layer 23 is formed by mixing the magnetic material 25 in the elastic material 24. As to the density of the material 25 inside the layer 23; the density of the outside peripheral part is thicker than that of the inside peripheral part. The outside peripheral surface of the layer 23 is coated with a surface protecting layer. As the material 24, silicone rubber, polyurethane rubber, butadiene rubber, acrylonitrile butadiene rubber, and natural rubber, etc., are used. As the material 25, iron, cobalt, nickel, and manganese, etc., are used. As the elastic layer, the rubber, a formed material, and sponge, etc., are used.
申请公布号 JPH1020673(A) 申请公布日期 1998.01.23
申请号 JP19960173654 申请日期 1996.07.03
申请人 RICOH CO LTD 发明人 MURAKAMI EISAKU
分类号 G03G15/09;F16C13/00;G03G15/08;H01F7/02;(IPC1-7):G03G15/09 主分类号 G03G15/09
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