| 摘要 |
PROBLEM TO BE SOLVED: To provide a conductive roller which is used as a roller for charging in which the difference in a photosensitive material abrasion quantities between a part to which both ends of the roller are pressed and a middle part is reduced remarkably to reduce the difference in properties between both end of the roller and the middle part is improved, a roller for development, a roller for transfer, and others in contact with a photosensitive material. SOLUTION: In a conductive roller, the outside shape of both end bearing parts of a rotary axis 2 is an axis with a step part 6 which is smaller than the outside diameter is a middle conductive elastic layer 3 forming part, a space part is formed from both ends of the layer 3 of a non-expanded rubber elastomer to the inside, a space inside both ends forms a taper in which the diameter decreases toward the peripheral surface of the rotary axis 2 and is formed in the shape of a circular truncated cone viewed from both end sides. The conductivity of the roller is a level of so-called semi-conductivity 10<3> -10<9>Ω-cm electric resistance. |
