| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of preventing the occurrence of fog by accurately detecting toner concentration by a simple configuration. <P>SOLUTION: In the image forming apparatus 1, a drum current flowing between a developing roller 22 to which a development bias is applied by a development bias power source 26 and an electrophotographic photoreceptor 11 electrified by an electrifying means 12 is detected by a drum current detection terminal 17 and, based upon the drum current detected by the drum current detection terminal 17, a control section 5 controls the operation of the development bias power source 26, thereby determining the value Vbe of an appropriate development bias to be applied to the developing roller 22. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
