| 摘要 |
PURPOSE:To prevent developer from staying on/sticking to a developer carrier, to stabilize an amount of toner sticking to the developing carrier and an amount of toner electrification and to prevent deterioration in image quality by adding silica into the surface of a member which slides on the developer carrier. CONSTITUTION:Electrified toner on a toner supply roller 5 is electrostatically attracted by the electric field of a microfield on a developing roller 4, and sticks to the surface of the developing roller 4 in the form of a multilayer. The toner layer on the developing roller 4 which has passed a contact part is made into a uniform thin layer by being uniformly rubbed by a layer- thickness-regulating plate, which slightly abuts on the developing roller 4, so as to have a uniform thickness, and is carried to a developing area by the rotation of the developing roller 4. Silica fine powder 20 is added into at least the toner supply roller 5 or layer-thickness-regulating plate. It is preferable that the added silica fine powder 20 have a volume averaged grain size of 0.5mum or larger. Thus, the toner staying on and sticking to the surface of the developing roller 4 can be scraped off. |
