Patent ID: 7896791

Claim:
A conductive roller comprising a metallic core and at least one rubber elastic layer provided on the outer peripheral surface of the core, the rubber elastic layer being formed from a conductive rubber which has ion conductivity and which contains carbon black micropowder, and a surface layer formed on a surface of the rubber elastic layer, the surface layer being selected from the group consisting of a protective layer and a high-resistance layer, characterized in that said rubber elastic layer before providing the protective layer or the high-resistance layer, and said rubber elastic layer with the protective layer or the high-resistance layer, respectively, both satisfy the relationship represented by the following formula: |θ max /θ min ≦2.96, [F1] wherein θ max represents the maximum value of phase difference θ as measured upon application of an AC voltage of 1.0 V within a frequency range of 100 mHz to 10 kHz, and θ min represents the minimum value of phase difference θ as measured under the same conditions.