ELECTROPHOTOGRAPHIC DEVICE

摘要

PURPOSE:To prevent the fluctuation in the density of a developed image and fogging of the white ground by supplying a prescribed voltage to a conductive base material which supports a photosensitive body, irradiating a light signal to the surface of a photosensitive drum which is maintained at zero potential by an AC corona electrifier and exposing the drum surface. CONSTITUTION:The photosensitive drum 1 has a photosensitive body 2 on the surface layer and is supported from the inside by the conductive base material 3. The material 3 is connected to a DC power source 4 and is maintained under the prescribed potential. The AC corona electrifier 5 is connected to an AC power source 6 which is set at about 10Hz-1kHz frequency and about 2-10kV voltage to maintain uniformly the surface of the drum 1 at zero potential. A light signal is irradiated from a light signal source 7 such as laser scanning head and LED array head to the surface of the drum 1 which is maintained uniformly at zero potential by the electrifier 5. The electrostatic latent image is thus formed on the drum 1 surface by which the fluctuation in the density of the developed image and fogging of the white ground is prevented.