| 摘要 |
PROBLEM TO BE SOLVED: To improve the localization of a sound field of an acoustic device employing a piezoelectric vibrator. SOLUTION: A couple of left and right acoustic diaphragms 20 are placed in parallel with both sides of a chair 50 having at least a seat section 52 and legs 56, the piezoelectric vibrator 10 is fitted to each of the acoustic diaphragms 20 and a sound signal is applied to the piezoelectric vibrators 10 to deliver the vibration generated by the piezoelectric vibrators 10 to the acoustic diaphragms 20 so that the sound wave is mainly propagated to the sides of the chair.
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