| 摘要 |
PURPOSE:To obtain an excellent color image by preventing the image density from changing due to the change of the toner static charge quantity corresponding to the change of the ambient environmental condition, particularly the change of the humidity. CONSTITUTION:The device is provided with a CPU 1 by which the toner density control target value is corrected basing on the detection signal obtained from an environment detecting means 5 and the developer color information under development of the electrostatic latent image obtained basing on the information from a host 100, and the control property of the toner feeding means is corrected basing on the toner density detection signal obtained from the toner density detecting units 12c, 13c, 14c and 15c. Basing on the toner density control target value at a normal temp./a normal humidity as reference value, the toner density control target value is corrected so as to be lowered when the humidity is high and the toner density control target value is raised when the humidity is low, and moreover, these target value is respectively corrected by each color, thus the excellent color image can be obtained by preventing the image density from changing by correcting the change of the toner sticking quantity to the electrostatic latent image due to the change of the environment. |
