| 摘要 |
PURPOSE:To constitute a titled device so that a carrying quantity of a developer carried toward a holding body of an electrostatic latent image is contant at all times, and to execute a uniform and stable development by setting a surface roughness of a developer carrying surface to within a specified range. CONSTITUTION:When moving onto an outside peripheral surface 6c of a carrying body roll 6 from a carrying roll 5, a developer 2 is brought to triboelectrification by a slide-contact of both the rolls 5, 6, and a sufficient charge is given. Also, the developer 2 on the carrying body roll 6 reaches a contact position of the second blade 4 by a rotation of its roll 6, it is formed to a developer layer of a prescribed thickness by this blade 4, and also, a sufficient charge is given to its developer layer by a slide-contact of the blade 4 and the roll 6. In this case, a surface roughness of the outside peripheral surface 6c of the carrying body roll 6 is set to a range of 0.1-0.5mum by a center line average surface roughness (Ra), therefore, a carrying quantity of the developer 2 by the carrying body roll 6 is constant even if it is used continuously for many hours. That is to say, the layer thickness of the developer layer formed by the blade 4 is constant. |
