To provide a deflection scanner in which the generation of uncomfortable noise is suppressed in converging period without extending a retracting time, sufficient braking force is applied at finish time, attached dust is reduced, resonance is not caused and silent drive is realized.

The frequency of retracting sound is reduced by partially masking, as shown in (B) and (C) in the figure, the speed reduction signal for applying short braking on a motor for rotating a rotating polygon mirror.