| 摘要 |
PROBLEM TO BE SOLVED: To restrict a power source capacity low without elongating a first print time as much as possible by sequentially starting to drive a plurality of driving motors each for driving and rotating each rotary polygon mirror with a time difference. SOLUTION: After a predetermined time for a current value of a driving current for driving a driving motor 104 of a rotary polygon mirror 125 to converge has passed, a driving motor 110 of a rotary polygon mirror 126 for magenta is started to rotate. After a predetermined time for a current value of a driving current for driving the driving motor 110 of the rotary polygon mirror 126 to converge has passed, a driving motor 111 of a rotary polygon mirror 127 for cyan is started to rotate. Further, a predetermined time later, a driving motor 112 of a rotary polygon mirror 128 for black is started to rotate. A power source capacity can be restricted low without elongating a first print time as low as possible.
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