| 摘要 |
PROBLEM TO BE SOLVED: To output good images by using two reference images so as to accurately control toner concentration. SOLUTION: A reference image forming part 25 forms a black solid patch on a photosensitive body 6 by a low light quantity and a texture patch by a high light quantity. A developing characteristic estimating part 22 approximates a developing potential from a middle concentration part to a high concentration part, which is a difference between a photosensitive surface potential measured by a surface potentiometer 14 and a developing bias added to a developing means, and a toner sticking amount measured by a toner sticking amount sensor 15 by a linear equation. A condition control part 23 controls an image forming condition based on the approximated relation between the developing potential and the toner sticking amount. |
