| 摘要 |
PURPOSE:To uniformly charge electrostatically the developing agent that is traveling between a carrier member and a control roll member by forming the surface of at least one of said carrier member and control roll member with a semiconducting material so that development process of images is performed uniformly. CONSTITUTION:The control roll member 5 is rotating at such a speed that a relative speed occurs between surfaces of the control roll member 5 and the carrier member 1 so that the layer of the developing agent caught on the surface 1a of the carrier member 1 is adjusted to have a uniform thickness. Further, a voltage is impressed across said members 1 and 5 by a voltage impressing means 7, thus in the layer of the developing agent with an adjusted thickness, the prescribed electrostatic charge is performed by said voltage. At least one of surfaces 1a and 5a of the members 1 and 5 is made of a semiconducting material, no undesirable spark discharge is occurred between the surfaces 1a and 5a of both members, when the voltage is impressed. As a result, uniform charge is performed in the developing agent layer, and the uniform development of electrostatic latent images 15 free from unevenness is assured. |
