| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a photoreceptor in an electrophotographic device, and a charging roller for the electrophotographic device for outputting a sufficient image where a banding image occurring after long term contact leaving is suppressed. Ž<P>SOLUTION: This charging roller has at least one elastic layer on the outside of a metal support body having a cylindrical shape of radius R. When Vickers hardness of the support body in an area about the axis of the support body that is surrounded with a circle of radius R/8 is assumed to be X1, Vickers hardness of the support body in an area about the axis of the support body that is surrounded with a circle of radius 7/16R and a circle of radius 9/16R is assumed to be X2, and Vickers hardness of the support body in an area about the axis of the support body that is surrounded with a circle of radius 7/8R and a circle of radius R is assumed to be X3, the charging roller establishes relational expression (1) 170≤X1≤235, (2) 210≤X2≤275, (3) 220≤X3≤290, and (4) X1<X2<X3. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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