| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent a low-charged toner and an oppositely-charged toner from adhering to a background area of an electrostatic latent image on a photoreceptor, and to avoid the generation of image fogging in the background area on a printed material. Ž<P>SOLUTION: A developing bias is set as follows. Electric field strength between a developing roller and a photoreceptor is set to cause a normally-charged toner to fly in an image area and not to cause the toner to fly in a background area. Thus, the normally-charged toner does not fly in the background area. The normally-charged toner caused to fly therefore hardly flicks the low-charged toner and the oppositely-charged toner. The low-charged toner and the oppositely-charged toner do not adhere to the background area and do not cause image fogging. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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