| US 7,573,164 B2 | ||
| Driving apparatus | ||
| Hiromu Yasuda, Yokohama (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, (Japan) | ||
| Filed on Jul. 27, 2006, as Appl. No. 11/460,496. | ||
| Claims priority of application No. 2005-218968 (JP), filed on Jul. 28, 2005. | ||
| Prior Publication US 2007/0024127 A1, Feb. 01, 2007 | ||
| Int. Cl. H02K 37/14 (2006.01) | ||
| U.S. Cl. 310—49R [310/181] | 2 Claims |
| 1. A driving apparatus comprising:
a first cylindrically shaped magnet whose outer circumferential surface is alternately magnetized as different polarities
in the circumferential direction;
a second cylindrically shaped magnet whose inner circumferential surface is alternately magnetized as different polarities
in the circumferential direction;
a rotor in which a first magnetic pole portion made of a soft magnetic material opposite to the outer circumferential surface
of the first magnet and a second magnetic pole portion made of a soft magnetic material opposite to the inner circumferential
surface of the second magnet are integrally formed;
a stator for fixing the first and second magnets to the same axis to rotatably support the rotor;
a first coil fixed to the stator to magnetically excite the first magnetic pole portion of the rotor; and
a second coil fixed to the stator to magnetically excite the second magnet pole portion of the rotor.
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