| 摘要 |
PROBLEM TO BE SOLVED: To provide a loud speaker diaphragm that has excellent heat resistance, has a wide reproduction frequency band because of a large specific modulus, and has a flat frequency characteristic because of a large internal loss. SOLUTION: The loud speaker diaphragm is obtained by forming a cart film made of an aromatic group polysulfone resin whose reduced viscosity is 0.60-1.0 dl/g, that contains 80 mol.% or more of a repetitive structural unit expressed in Formula (I) per molecular, whose mean film thickness is 40μm or below and whose thickness accuracy is within 10% of the mean film thickness.
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