In order to reproduce a original tone with high fidelity, a speaker is required to have its reproduction frequency characteristics improved and the distortion rate decreased, so that the material for a vibration member must satisfy the following requirements.

Liquid crystal polymer is used as the vibration member material, while the method of injection molding is adopted to allow the characteristics to show off. It is necessary to select a resin of excellent fluidity in order to apply the injection molding method to the molding of a vibration member. This method has a shortcoming: the high cost of metallic mold. However, since the polymer is filled at a super high speed through an extremely thin flowing section, the polymer gets oriented to improve the strength. Particularly the nematic phase formed by the liquid crystal polymer in molten state is likely to allow high-degree polymer orientation, ensuring steady quality of the vibration member.

1. The material when molten takes the liquid state with less interlocking of polymer, causing the flow resistance to get reduced and the melting viscosity to get extremely lowered.
2. The molecular chains at molding get arranged in the direction of flow, showing high elastic coefficient.
3. Composed of stiff molecules, the material needs several fractions of the conventional material to provide the equivalent stiffness.
4. The partial crystallinity of the material at molten state reduces the mold shrinkage factor attributed to the phase change.
5. The material is a crystalline polymer, and from its structural formula, the material is obviously excellent in thermal resistance and chemical resistance.
6. The material excellent mechanical and acoustic damping properties, which may be attributed to the basic skeletal system of the polymer and the multilayer structure of the molding.

General audio speakers, and car audio speakers