| 摘要 |
PURPOSE:To improve both frequency characteristics and durability of a speaker diaphragm, by using a composite film of polybisphenol phthalate resin and talc to produce a diaphragm. CONSTITUTION:A film is produced by compounding properly talc to polybisphenol phthalate resin composed of aromatic carboxylic acid such as isophthalic acid, telephtalic acid, etc. or a mixture of these two acids and bivalent phenol such as bisphenol A. This film has a high elastic modulus of 21,000- 52,000kg/cm<2> with a large loss of 0.021-0.035. This ensures the reproduction up to a high frequency with a diaphragm using said film, and furthermore the variance of frequency characteristics can be reduced. |
