| 摘要 |
PROBLEM TO BE SOLVED: To suppress the decline of a halftone image density due to toner deteriorated with time, in an intermediate transfer type image forming apparatus for transferring a toner image formed on a photosensitive element through an intermediate transfer body to a recording medium.SOLUTION: A toner pattern for detecting the degree of toner deterioration is created on a photosensitive element 202 and transferred onto an intermediate transfer belt 101 by a primary transfer means 106 under a transfer condition different from that when forming images, and the toner adhesion amount of the toner pattern is detected by a toner adhesion amount detection means 110 at multiple parts. Then, the degree of toner deterioration is detected by a degree-of-toner-deterioration calculation means on the basis of variation in data of the toner adhesion amount at multiple parts detected, by the toner adhesion amount detection means. A background potential determination coefficient in a process control means is controlled on the basis of the degree of toner deterioration calculated by the degree-of-toner-deterioration calculation means. |
