| 摘要 |
A second housing ( 20 ) is formed with an oscillating portion ( 24 ) for creating an aerial vibration by the collision with a resiliently restored lock arm ( 13 ) and a resonance space ( 25 ) for causing the aerial vibration created by the oscillating portion ( 24 ) to resonate. When the lock arm ( 13 ) is resiliently restored, the aerial vibration created by the oscillating portion ( 24 ) upon the collision with the lock arm ( 13 ) resonates in the resonance space ( 25 ), and a collision sound of the lock arm ( 13 ) and the oscillating portion ( 24 ) is amplified by this resonance.
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