Mirror rotating apparatus

A mirror rotating apparatus comprising:

• a stationary portion;
• and
• a rotating portion configured to rotate about a rotation axis extending in a vertical direction with respect to the stationary portion;
• wherein
• the stationary portion includes:
• a stator;
• and
• a detection sensor configured to detect rotation of the rotating portion;
• the rotating portion includes:
• a rotor magnet arranged radially opposite to the stator;
• and
• a mirror portion whose outside surface includes a plurality of mirror surfaces each of which is arranged to face radially outward;
• the mirror portion includes:
• a rotation detection surface arranged opposite to the detection sensor;
• and
• a balance correction portion defined by a groove or a projection extending in a circumferential direction in the rotation detection surface;
• the balance correction portion is arranged such that a center of gravity of the mirror portion is closer to the rotation axis as compared to a case where the balance correction portion is not provided;
• the detection sensor is configured to emit light toward the rotation detection surface and receive the light reflected from the rotation detection surface;
• and
• the rotation of the rotating portion causes the balance correction portion to pass a region to which the light is emitted from the detection sensor.