| 摘要 |
PURPOSE: A vibration speaker is provided to limit the vibration within a predetermined region by installing alternately plural magnets and plural yoke plates at the inside of a U-yoke and locating a voice coil at the intermediate yoke plate. CONSTITUTION: A vibration speaker includes a cylindrical housing(9), a vibrating body(6), and a voice coil(42). A top plate(4) having an EVA gasket(2) is installed on a top part of the housing. A space is formed within the housing. The vibrating body includes a U-yoke(66) and magnets. The U-yoke is fixed on an inner circumference of the housing. The magnet is fixed on a top end of the U-yoke by yoke plates. The voice coil is installed at a bottom of the top plate. The voice coil is inserted between the yoke plate and the U-yoke. A first yoke plate(62a), a second yoke plate(62b), and a third yoke plate(62c) are sequentially stacked on an inner side of the U-yoke. A first magnet(64a) is inserted between the first and the second yoke plates. A second magnet(64b) is inserted between the second and the third yoke plates. the voice coil is located between an outer circumference of the second yoke plate and an inner circumference of the U-yoke.
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