| 摘要 |
PURPOSE:To prevent generation of image flow due to sticking paper powders, and insufficient cleaning by mixing powders having non-hygroscopic property with the toners in a developing vessel, and by making the powders in such way that the charge polarity of the toner has reverse polarity at a position of developing the toners. CONSTITUTION:An electrostatic latent image formed on the surface of an image supporting body 1 is processed to a visible image by using an one component toner. At this time, the powders having non-hygroscopic property are mixed with the toners in the developing vessel 3. The powders make in such way that the charge polarity of the toner has the reverse polarity at the position of developing the toners. In order to make the charge polarity of the powders into the reverse polarity for the toner, for example, the powder such as a hydrophobic silica having strong negative electrification or a silica which has strong positive electrification and is treated with aminosilane, and having the reverse polarity against the polarity of the toner may be used, or the powder having frictional electrification series different from that of the toner may be used, thereby injecting the charge having the reverse polarity with respect to the charge polarity of the toner to the powder by mutual frictional electrification between the toner and said powder, or the frictional electrification between the toner and the toner metering material 6. Thus, the generation of the image flow due to sticking the paper powders and insufficient cleaning are prevented, thereby always obtaining clean image. |
