| 摘要 |
PROBLEM TO BE SOLVED: To realize a flat vibration motor which can generate vibration with a large amplitude while the size is reduced. SOLUTION: An annular stator 4 whose half is magnetized into S-polarity and whose the other half is magnetized into N-polarity is fixed inside of a flat cylindrical casing 3 and a rotatable disc-shape rotor 5 is so provided in the casing 3 as to face the stator 4. Three armature coils 11a, 11b and 11c which have cores 25a, 25b and 25c respectively are uniformly so arranged in the rotor 5 as not to overlap each other. The weight of the core 25a of the armature coil 11a is smaller than the respective weights of the cores 25b and 25c of the other armature coils 11b and 11c.
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