CONTROL ELECTRODE MEMBER FOR ELECTROPHOTOGRAPHIC DEVELOPING DEVICE AND DEVELOPING METHOD

PURPOSE: To accurately and stably set a plate-like control electrode member in developing space formed by an image forming body and a developer carrying body opposed to the image forming body and to obtain a sufficient developing accelerating effect by forming the control electrode member of an insulating member having a dielectric constant in 1MHz larger than a specified value and an electrode member provided on the insulating member. CONSTITUTION: This control electrode member is constituted of the insulating member 45a inserted and set between the developer carrying body 41 and the image forming body 1 on an upstream side from a developing area or in the developer carrying direction of the developer carrying body 41 and the electrode member 45b provided on the insulating member 45a. The dielectric constant in 1MHz of the insulating member 45a is set to exceed 3.5 at 25 deg.C. A part of the plate-like control electrode member 45a constituted of the insulating member 45a and the electrode member 45b, for example, a part along the axial direction of a developing roller being the developer carrying body 41 is held in the shaft direction by a holding member 45c, whereby the control electrode member is accurately arranged in the developing space formed by the image forming body 1 and the developer carrying body 41 opposed to the image forming body 1.