| 摘要 |
PURPOSE:To provide an image forming device equipped with a magnetic brush electrifier capable of preventing magnetic particles from sticking onto an image forming body, eliminating the generation of ozone, and performing extremely stable and uniform electrification. CONSTITUTION:This device is provided with a non-magnetic and conductive cylinder 22 rotatably disposed on the outer periphery of a magnetic 23 having the outer periphery where magnetic poles are arranged, and the electrifier 20 electrifying a photosensitive drum 10 by bringing a magnetic brush constituted of the layer 21 of the magnetic particles adhering to the outer periphery of the cylinder 22 into contact with the moving drum 10 and impressing bias voltage consisting of a DC component and an AC component between the magnetic brush and the drum 10; and the drum 10 and the cylinder 22 are driven to be rotated in the same timing. Before they are driven, a pretransfer exposing lamp 14 is turned on and the impressed voltage is set to be low near 0V, and while they are driven, the bias voltage obtained by superposing the DC component on the AC component is impressed on an image area. After they pass the image area, the impressed bias is changed to low voltage near 0V, and after the drum 10 is stopped, the lamp 4 is turned off. |
