| 摘要 |
PURPOSE:To check the effect of rubbing at the time of 2nd developing, to secure desired image density and to obtain a high-quality image by specifying the supply amount of 1st developer containing a coloring agent with specified concentration. CONSTITUTION:A photosensitive body 1 is uniformly electrostatically charged, a 1st latent image is formed by a 1st exposing device 3, and a toner image is formed by supplying the 1st toner from a 1st developing device 4. Then, a 2nd latent image is formed on the toner image by a 2nd exposing device 5, a 2nd toner image is formed by supplying the 2nd toner from a 2nd developing device 6, and then the image is transferred and fixed en bloc on a recording sheet 9. In order to perform 1st developing, toner obtained by blending 10-20wt.% coloring agent basing on a toner grain whose additive agent is removed as a reference is used, and development is performed by adjusting a developing potential so that the weight of the toner put on the photosensitive body 1 may be <=0.4mg/cm<2>. |
