| 摘要 |
An optical deflection/scanning apparatus includes a rotary polygon mirror for reflectively scanning a light beam and a motor for rotating the rotary polygon mirror. The motor has a rotor yoke and a rotor magnet. The rotor magnet is attached inside of the rotor yoke such that a curved portion of the rotor yoke projects vertically from one end of the rotor magnet so as to prevent any trouble caused on the lower end of the rotor due to a centrifugal force during rotation of the rotary polygon mirror.
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