| 摘要 |
PURPOSE:To form a good recorded picture without ground fog and extend the life of a photosensitive body by constituting a device so that the photosensitive body is not brought into contact with a developing roll but is brought into contact with a toner layer on the developing roller. CONSTITUTION:A photosensitive body 31, a developing roller 35, and a magnetic brush developing device 36 are arranged at intervals of prescribed distances, and a negatively electrostalically charged toner is so set that the toner in the side of the developing roller 35 has a higher potential by electric power sources 46 and 48, and a toner layer 50 is formed by application of a voltage, and its thickness is controlled by a DC voltage volue between the roller 35 and a sleeve 39. The toner is attracted to the roler 35 in a section AB, where the applied voltage value is higher than a remaining potential VR of a photosensitive layer 33, and the toner is attracted to the photosensitive layer 35 in a section BC where the applied voltage value is lower, and the toner is stuck uniformly in a latent image part, and the toner is removed in a non-latent image part. Consequently, pressure is not applied to the toner, and the thickness of the toner attracted to the latent image part is made uniform to obtain a good recorded picture without ground fog. |
