| 摘要 |
PROBLEM TO BE SOLVED: To obtain an active lightweight sound isolation unit for controlling transmission sound of a floor, a door and a wall, by utilizing a characteristic of a flat speaker. SOLUTION: The active lightweight sound isolation unit 20 is constituted by stacking a bottom plate section 13 formed by stacking plastic corrugated boards 13a and 13b, on the flat speaker 21 formed by pinching a thin printed coil plate 21e via buffer sheets 21ga and 21gb with permanent magnet plate 21a, 21b, thereby reducing a primary sound source. COPYRIGHT: (C)2010,JPO&INPIT
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