| 摘要 |
PURPOSE:To obtain superior picture quality in one component developing device, by constituting a developer supporting body of dielectric substance in which a conductive particle is dispersed, and increasing the volume proper resistance of the supporting body from the inside to an outer surface. CONSTITUTION:Resin solution 21 with low viscosity in which the conductive particle 23 is dispersed uniformly is poured into a horizontal tray 22, and the solution is left as it is and hardened. The conductive particle 23 sediments gradually, and the particle is dispersed densely at a bottom part and coarsely advancing to the surface. The substance is formed cylindrically and hardened completely, then, a developing roller can be produced. Or, the resin solution in which the conductive particle is dispersed uniformly is poured into a cylindrical die starting from the particle with the highest compound ratio in order, and the roller is produced by dispersing the particle coarsely advancing to the outside gradually. Or, it is produced by spraying the solution in the periphery of a cylindrical metallic die. Thus, by providing inclination on the volume proper resistance of a layer extending from the inside of the developing roller to the surface, it is possible to obtain picture quality having superior density gradation characteristic and fine line and dot gradation reproducibility. |
