| 摘要 |
In a miniature electric motor for generating vibration, an output portion of a rotary shaft is formed into an irregular shape in cross-section other than a circular shape in cross-section. An engaging hole having a predetermined shape in cross-section, which corresponds to the irregular shape in cross-section of the output portion and which makes a vibrator to be kept under a relatively non-rotatable condition to the rotary shaft, is formed in the vibrator. The output portion is engaged with the engaging hole and the vibrator is positioned and held in a thrust direction relative to the output portion to thereby fix the vibrator to the rotary shaft. This motor is used as a vibration generator for a mobile phone and the like.
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