| 摘要 |
PROBLEM TO BE SOLVED: To improve display quality by preventing the change in an image density as a result of the change in a static charge quantity of the two component developer during the developing operation repeating time, by means of correct and simple control, in a developing device capable of equally driving a developing roller and a mixer. SOLUTION: This developing device is made possible to life control the developer 17 by means of the control of the developing device speed (Vm/Vp) of the developing roller 12, even that is developing device capable of drive/ controlling the developing roller 12, and first and second mixers 14a and 14b by the same driver 18, in preventing the deviation of output voltage from the automatic toner sensor 20 by adjusting control voltage of the automatic toner sensor 20 by dealing therewith, in the case of controlling the developing device speed (Vm/Vp) of the developing roller 12 for the life control of the developer. |
