| 摘要 |
PROBLEM TO BE SOLVED: To generate a uniform acoustic space and to reproduce natural original sound by fitting a piezoelectric vibrator consisting of a piezoelectric diaphragm and a torus vibration control chip made of an elastic material and fitted along a circumferential part of the piezoelectric diaphragm to a wall face surrounding a space which people go in/out so as to vibrate the wall face itself. SOLUTION: A wall face 100 enclosing a room 102 as a space which people go in/out is provided with an inner wall 110 and an outer wall 120, the inner wall 110 is supported and fixed to the outer wall 120 by a plurality of support members 130. Then a piezoelectric vibrator provided with torus vibration control chip along an outer circumferential edge of one side face of a circular piezoelectric diaphragm is fitted to an outer side face of the inner wall 110 or the inner side face 114, or an outer side face 122 or an inner side face 124 of the outer wall 120. This piezoelectric vibrator vibrates the wall face of the inner wall 110 or the outer wall 120. The piezoelectric vibrator may be fitted to the support member 130 regarded to be integral with the wall face.
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