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1. 发明公开

EP1113704A3 Diaphragm for a speaker unit 有权
标题翻译：振膜扬声器设备
公开(公告)号：EP1113704A3
公开(公告)日：2003-05-02
申请号：EP00127749.0
申请日：2000-12-19
申请人： JSP CORPORATION
发明人： Ishihara, Yoshihisa , Aoki, Takeshi , Iwasaki, Satoshi , Kakuta, Hirotoshi, 101 Sharman-honcho
IPC分类号： H04R7/00
CPC分类号： H04R7/00 , H04R2307/029
摘要： The present invention relates to a speaker unit comprising a diaphragm comprising a 0.5 to 10mm thick aromatic polycarbonate with a density of 0.03 to 0.6g/cm 3 , and a mechanism for driving the diaphragm. The elastic modulus in tension of the aromatic polycarbonate resin foam sheet or plate used to form the diaphragm for the speaker unit of the present invention is preferably at least 1 MPa at temperatures of 25°C, 50°C, 80°C, and 105°C, the tanδ of the foam sheet or plate is preferably at least 0.02 at a temperature ranging from 25 to 105°C during measurement of the dynamic viscoelasticity in bending tests giving 1 Hz frequency oscillation strain, and the mean cell diameter of the foam sheet or plate is preferably 0.05 to 1mm, with a foaming agent left over content of no more than 0.3mol/kg in the foam forming said diaphram. The aromatic polycarbonate resin forming the diaphragm in the present invention preferably comprises an aromatic polycarbonate resin derived from bisphenol, preferably with a viscosity average molecular weight of 25,000 to 70,000. The percentage of open cells in the aromatic polycarbonate resin foam forming the diaphragm in the present invention is preferably no more than 50%.

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