| 摘要 |
PROBLEM TO BE SOLVED: To prevent deterioration of image quality, increase of a waiting time, increase of toner consumption and discharged toner, etc. SOLUTION: An in-device memory is arranged in a developing device which is freely attached/detached to/from the main body of the image forming apparatus, and a main body memory is arranged on the main body side. The last optimum bias stored in the memory in the developing device is compared with the latest developing bias (S14), and a density detection interval is changed based on the difference ΔDi. When ΔDi>=A is established, the interval is shortened (S18), when A>=ΔDi>=B is established, the interval is not changed, and when B>ΔDi is established, the interval is prolonged. Then, the deterioration of the image quality and the increase of the waiting time are prevented by performing the density control to an absolute minimum. |
