| 摘要 |
PURPOSE: To provide a toner concentration controller in an image forming device capable of preventing surface staining, the scattering of toner, etc., by preventing the increase of a toner concn. caused by the fluctuation of the characteristic of a developer, with a lapse of time. CONSTITUTION: The toner concentration controller in the image forming device is provided with a developing device 7 for supplying the toner to a latent image formed on an image carrier, to visualize the latent image, a toner supplying means 13 supplying the toner to the developing part of the developing device, a toner concentration detecting means 11 detecting the concn. of the toner in the developing device, a toner supplying control means 1 controlling the toner supplying means, based on the result of the comparison of the output value of the toner concentration detecting means with the target value, an image density detecting means 16 detecting the image density of a reference image formed on the image carrier and a target value correcting means 2 comparing the target value with a threshold set in advance, changing the threshold in accordance with the output value of the image density detecting means and correcting the target value. |
