| 摘要 |
PROBLEM TO BE SOLVED: To simplify the assembling process of the driving section of a rotational polygon mirror and to prevent generation of trouble due to displacement of the rotor magnet, etc., during the rotation of the polygon mirror by forming the rotor magnet, etc., of the motor integrally with the rotating sleeve. SOLUTION: The rotor magnet 6 of the motor which rotates the rotational polygon mirror 1 is made by mingling magnetic particles such as ferrite to a matrix composed of ceramic powder and integrally forming the mixture with the rotating sleeve 4, and the main body of the rotating sleeve 4 which is fitted with a fixing axis 3 is formed by ceramics alone. Similarly a permanent magnet 10a at the lower end of the rotating sleeve 4 is integrally formed with the rotating sleeve 4 by mingling ferrite with ceramic matrix. By this, the assembling process of the device is simplified and troubles such as assembling error are avoided. |
