| 摘要 |
PROBLEM TO BE SOLVED: To always obtain an excellent image without having an abnormal image by suppressing the fluctuation of toner concentration by estimating a change in the electrified quantity of toner from a standstill time after stopping a developing device and a humidity environment and recovering the electrified quantity of the toner by stirring the developer for a proper time in the case of an image forming device provided with the developing device of a two- component developing system. SOLUTION: This device is provided with the developing device 2 executing development by developing a latent image on an image carrier 1 with two- component type developer, a toner replenishing means 18 supplying the developing device 2 with the toner, toner concentration detecting means 19A and 19B detecting the toner concentration of the developer and a toner concentration controlling means 25 controlling the toner replenishing means, based on the output value of the toner concentration detecting means. In this case, a humidity detecting means 26 detecting humidity is provided, and a rotating time (stirring time) at a warm-up time is corrected in accordance with the standstill time after the developing device stops operation, the information of the humidity before standstill and the information of the humidity during a stopping period. |
