| 摘要 |
PROBLEM TO BE SOLVED: To provide a light quantity adjusting device where a rotor having hollow cylindrical shape, an inner yoke positioned inside the hollow of the rotor and an outer yoke positioned on the outer circumference of the rotor are exactly attached to a device base plate without causing positional deviation, and which prevents the deviation of attaching position or deformation at the assembly time of the device or in the midst of using the device. SOLUTION: The inner yoke 11 is formed in bar shaft shape fit to the inside of the hollow of the rotor 9, and the magnetic pole forming pieces 15a and 15b of the outer yoke 16 are formed of saw-toothed pieces extended from the base end of the hollow cylindrical shape. At least two magnetic pole forming pieces of the yoke 16 opposed to each other are respectively fit and fixed in mount holes formed on the base plate 23, and the yoke 11 is fixed at the cylindrical base end of the yoke 16 and the rotor is turnably supported on the yoke 11 and the base plate 23 respectively. COPYRIGHT: (C)2005,JPO&NCIPI
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