| 摘要 |
PURPOSE:To form a good toner image, to improve transfer efficiency and to obtain copies having high image quality, by applying AC voltages having a phase between a photosensitive drum and peripheral devices, and acting periodic electrostatic forces upon a developer. CONSTITUTION:The output of the DC bias circuit 14 of an AC electric power source circuit 11 is connected to a photosensitive drum 1, a corona discharger 4, etc. and an AC voltage V1 is applied. The other end side of a transformer 17 is connected to a sleeve 9, etc. of a developing device, and an AC voltage V2 differing in phase by 180 deg. from the voltage V1 is applied. Therefore, mutual electrostatic forces are generated between the drum 1 and the sleeve 9, and the electrostatic forces act upon the developer in superposition with the electrostatic force of the latent images. According to the combined forces thereof, the developer 10 is oscillated by which good toner images are formed. Owing to the effect of the electrostatic forces generated like AC, transfer efficiency is considerably improved as compared to the prior art. Thus copying having high quality is obtained. |
