| 摘要 |
PROBLEM TO BE SOLVED: To provide a toner concentration controller to obtain excellent image density by automatically correcting the fluctuation of toner concentration and output from a toner concentration sensor caused by environmental fluctuation and making the number of pattern forming times for a pattern density sensor minimum. SOLUTION: By automatically adjusting a distance between the toner concentration sensor 2 and developer 1 in accordance with the environmental fluctuation by using a sheet member 5, the fluctuation of the toner concentration and the output from the toner concentration sensor is automatically corrected. |
