| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a developing roller hardly causing deposition of toner or its additive component even when the roller is used for a long period of time. <P>SOLUTION: The developing roller comprises a core metal 2 and an elastic layer 3 around the core metal, and a surface layer 4 thereon. The elastic layer 3 is formed from the material wherein carbon black is added to silicone rubber being a base material. The surface layer 4 is formed from the material wherein the carbon black and phenol resin particles are added to silicone resin or fluorine resin being the base material. The surface roughness Ra of the surface layer 4 is controlled in a range of 0.5 to 3.5 by the add amount of the phenol resin particles. Thereby, the toner conveyance amount is controlled in an appropriate range. The surface energy of the surface layer 4 is controlled to 30 mN/m or less. Thus, deposition of the toner or its additive components is prevented. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
