| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming device and an image forming method, by which the density of a toner image is easily and surely stabilized over a wide range of density. SOLUTION: By forming solid patch images on various patch forming conditions (Va and E) and then measuring the optical density of the respective solid patch images by a patch sensor, the patch-forming condition watching with high density side target density (OD=1.2) is extracted as 'high density side correlation data'. Then, by forming line patch images on the various patch- forming conditions (Va and E) and measuring the optical density of the respective line patch images by the patch sensor, the patch-forming condition which matches low density side target density (OD=0.2) is extracted as 'low density side correlation data'. Thus, optimum electrification bias and optimum developing bias are set based on one correlative data (Va(2)and E3) belonging to the product set to the high-density side correlation data and the low-density side correlation data. |
