| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a double-side printing device capable of minimizing a retransfer phenomenon that toner on transfer material returns to an image carrier. <P>SOLUTION: A current Ipc flowing in the direction of the transfer material from an electrification control means for controlling the electrifying polarity of the toner on the transfer material is made higher than the transfer current Ipt of an image forming unit where retransfer occurs. In the image forming unit where the retransfer occurs, especially, a destaticizing light source for removing charge at a part other than the latent image part of the image carrier is arranged between a developing means and a transfer means, and the current is set so that relation between Ipt and Ipc may satisfy 3×Ipt≤Ipc≤6×Ipt, whereby the retransfer amount is restrained to the minimum and excellent image quality can be obtained. <P>COPYRIGHT: (C)2003,JPO |
