| 摘要 |
PROBLEM TO BE SOLVED: To prevent such image deficit as void in the case a thin paper passes, and to obtain good transfer performance in the case of using a cardboard without making the cost high, etc., by changing the value of a bias voltage impressed on a developing means in accordance with the kind of a transfer material or the exposure of an exposing means. SOLUTION: When the transfer material is a thin paper, the bias voltage value is made small, and the difference between the bias voltage value and the potential of a non-image part is made small. Then, toner becomes slightly adhering to a part corresponding to the non-image part (white image part) of an image carrier 1. By the existence of a slight amount of the toner between the image carrier 1 and the transfer material at the non-image part, electrostatically attracting force between the image carrier 1 and the transfer material is weakened, and the transfer material can extends on both sides of the image carrier 1. That is, the toner works as a kind of lubricant. Since a very small quantity of the toner adheres to the non-image part at this time, and the adhesion between the toner and a photoreceptor is strong, the toner on the non-image part is not transferred on the transfer material in transferring process. |
