| 摘要 |
PROBLEM TO BE SOLVED: To provide a method to improve the air gap accuracy of an induction magnetic member and a magnet rotor and a light quantity adjusting device whose excellent performance is maintained by simplifying assemblability by reducing the number of parts. SOLUTION: The inclination of the axial center of the magnet rotor is prevented by a method by which two bearing parts are integrally molded at a base plate and the magnet rotor is fitted in the bearing part having an aperture part by using elastic deformation, and then, the aperture direction of the bearing part is arranged in a direction nearly orthogonal with the magnetic pole direction of two opposed poles of the induction magnetic member, so that the influence of axial backlash due to the aperture part of the bearing part is eliminated.
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