| 摘要 |
A loudspeaker diaphragm which is light in weight (low in density), good in environmental resistance, high in internal loss, easy to form, and high in degree of flexibility in designing its shape is provided. A polyimide foam material which has been molded into a block of foam having a predetermined thickness is heated and pressed by a die into a loudspeaker diaphragm made of the polyimide foam material.
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