| 摘要 |
PURPOSE:To inexpensively achieve gradationcorrection catching the transfer efficiency in a simple structure. CONSTITUTION:When the density of each gradation pattern transferred on a transfer belt 2 at each image formation station based on the gradation density pattern generated based on gradation density pattern data recorded in the internal memory of a control circuit 9 is detected by a density sensor 50, the control circuit 9 individually controls and corrects the gradation characteristic set at each image formation station, according to the level of the detected density of each gradation pattern. |
