| 摘要 |
PROBLEM TO BE SOLVED: To provide a vibrating-type motor in which only the restoring force is reduced without reducing a thrust force increasing effect by auxiliary magnets, thereby enabling miniaturization, high efficiency and cost reduction. SOLUTION: The vibrating-type motor is provided with: a movable portion having a substantially cylindrical main magnet made of a permanent magnet having inner and outer peripheral sides magnetized on different poles, and substantially cylindrical auxiliary magnets each coaxially joined to both axial end portions of the main magnet and made of a permanent magnet having inner and outer peripheral sides magnetized on the magnetism reverse to those of the main magnet; an exciting yoke including two leg portions opposite to the movable portion via a gap portion and disposed coaxially with the movable portion; an exciting coil wound around the exciting yoke and generating a magnetic flux on the leg portions; and a cylindrical back yoke located so as to be opposite to the exciting yoke with the movable part sandwiched, wherein the axial end portions are housed inside from the outer both ends nearest to the movable portion in the leg portions of the exciting yoke. COPYRIGHT: (C)2009,JPO&INPIT
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