| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize the accurate control of the toner concentration of developer. <P>SOLUTION: In the image forming apparatus equipped with an electrifying device to electrify a photoreceptor drum by using a magnetic brush, the variation of a control voltage value for adjusting the detection signal of a toner concentration sensor with respect to the number of image forming times is made different for every color developing unit so as to solve a problem that the quantity of magnetic particles mixed in a developing device is different according to the color of an image forming station. <P>COPYRIGHT: (C)2004,JPO |
