| 摘要 |
This image-forming apparatus includes a plurality of photosensitive drums, a plurality of laser scanning units, and a motor control unit. A motor control unit detects the time difference between a change point of the detection signal of a reference color and the change points of colors targeted for phase correction, and, when the absolute value of the time difference is greater than a threshold, carries out a rough adjustment process for reducing the time difference by a drive signal with which a base period has been changed by a first period change amount and thereafter carries out a fine adjustment process for reducing the time difference by a drive signal with which the base period has been changed by a second period change amount smaller than the first period change amount.
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