| 摘要 |
A waved out-diffusion triangular beam-typed resonant board includes a resonant board body, an upper board, a lower board and a paper bobbin. The resonant board body is formed by pressing with waves diffusing outwards horizontally at close intervals from its center and having, connection between peak and valley in straight line. The upper board is adhered to the to and the lower board is adhered to the bottom of the resonant board body so that application of force from the top or bottom will not deform or bend the resonant board. The paper bobbin is adhered to a round hole at the center of the resonant board body. Since vibration will apply a force at the top and bottom of the resonant board, but the resonant board body has a strength to withstand the vibration without any deformation the requirement for a good thin-type low frequency speaker are met.
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