| 摘要 |
PURPOSE:To perform satisfactory transfer by providing a magnetic means retaining magnetic toner between an electrode and the surface of an image carrier and impressing electric bias with an alternating electric field to the electrode during developing. CONSTITUTION:A recording electrode 3 is arranged near to the surface of the image carrier 1 so as to be able to cover recording width in a longitudinal direction. A magnet 4 is arranged on the reverse side of the image carrier 1, relatively near to the recording electrode 3, so as to be magnetically connected with the developing part thereof. The magnetic toner retained on the tip of the recording electrode 3 is formed into a toner chain 5 along lines of magnetic force between the recording electrode and the surface of the image carrier 1. At this time, the electric bias with an AC component superposed on a DC component is impressed on the recording electrode 3. As a result, a pulse-like developing electric field is formed in an image part, and electric charge is injected in the toner chain 5 by each pulse transiently. Satisfactory developing can be thereby performed, even when insulating magnetic toner is used. |
