| 摘要 |
PURPOSE:To prevent a supporting device from causing an inversed vibration even under the pressure inside a compact cabinet by providing a coarse roll part between a circular-shaped inner bonded part and the outer bonded part, and extending the extension fo amplitude range. CONSTITUTION:The coarse roll part 8 consists of outer triangular plates 12 in the same number of pieces at that of plural inner triangular plates 10 pro vided to the inner bonded part 6 via a bending part 9 and that of those provided to the outer bonded part 7 via a bending part 11, the plates 12 being arrayed shifting by half a pitch from each other. If the part 6 to which the peripheral part of a diaphragm (not shown in the figure) is fixed shifts backward, a bend ing occurs in the parts 9 and 11, and the respective points of the part 8 ampli tude in the radial direction causing the expansion and contraction in the circumference-direction. But said expansion and contraction are compensated by the opening and closing of a pleat, and accordingly, a large amplitude area as well comes able to amplitude.
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