| 摘要 |
<P>PROBLEM TO BE SOLVED: To detect accurate toner density regardless of the deteriorated state of a developer in an image forming apparatus. <P>SOLUTION: In the device, the state of deterioration of the developer is detected by providing a counting means to count the accumulation of slid distance of a developing roll, detecting based on the slid distance detected by the counting means is carried out and the first toner density detection timing immediately after the action start is varied by using a table. <P>COPYRIGHT: (C)2003,JPO |
