| 摘要 |
PROBLEM TO BE SOLVED: To provide a drive device and a light quantity adjustment device capable of reducing dimensions in the thickness direction. SOLUTION: The light quantity adjustment device includes a magnet 1, a coil 2, a stator yoke 3, a rotor yoke 4, and a shutter blade 5. The magnet 1 is formed into a hollow disc shape, and at least one board surface is alternately polarized at the different pole in a circumferential direction. The rotor yoke 4 has a pole 4a extended in a diametrical direction of the magnet 1 and facing a polarized surface of the magnet 1. The pole is supported to the magnet 1 by a bobbin 2a so as to be rotatable. The stator yoke 3 is disposed on the opposite side of the rotor yoke 4 with the magnet 1 sandwiched to fix the magnet 1. The coil 2 is fixed at the stator yoke 3 to excite the pole 4a of the rotor yoke 4. The shutter blade 5 is engaged with the dowel 3d of the stator yoke 3, and the shutter driving pin 4d of the rotor yoke 4 to be disposed on the inner-periphery side of the magnet 1. COPYRIGHT: (C)2007,JPO&INPIT
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