| 摘要 |
PURPOSE: A driving device and a light amount controller are provided to achieve a small-sized and slim driving device which is easy to manufacture and capable of producing high output. CONSTITUTION: A driving device comprises a magnet(1) having a hollow cylindrical shape and having an outer peripheral surface and an inner peripheral surface, at least the outer peripheral surface being circumferentially divided into n sections magnetized so as to have alternately different poles, the magnet being rotatable about a rotational axis of the hollow cylindrical shape thereof, a coil arranged axially of the magnet and parallel thereto, an outer magnetic pole portion(4a) disposed to be magnetized by the coil, the outer magnetic pole portion having a plurality of hair comb tooth-shaped portions opposed to the magnet and arranged around the magnet such that an angle corresponding to a circumferential width of each of the hair comb tooth-shaped portions opposed to the magnet about the rotational axis of the hollow cylindrical shape of the magnet is equal to a predetermined angle A, and an inner magnetic pole portion(4b) disposed to be magnetized by the coil, the inner magnetic pole portion having a hollow cylindrical shape opposed to the inner peripheral surface of the magnet.
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