| 摘要 |
A diaphragm for loudspeakers comprises the magnesium base alloy as a substrate, in which the content of magnesium is over than 90% and the outer layers are porous oxide ceramic layers. The composite multi-layers structure of this magnesium base diaphragm is formed by the process of micro-arc plasma-electrolytic treatment (MAPET), an advanced environment-friendly electrolytic process. The outer multi-layers porous ceramic layers provide the function of corrosion protection for magnesium which is vulnerable to the general environment. The ceramic layers also improve the stiffniess of the diaphragm. With the combination of the stiffness improvement and excellent mechanical internal loss property from magnesium, the driver made of this multi-layers structure diaphragm are with the wider effective frequency response range and less distortion resulted from the partial vibration of the diaphragm.
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