发明授权
US4173701A Speaker diaphragm molded from poly-biphenol phthalate type resin film
失效
扬声器隔膜由聚邻苯二甲酸双苯酚型树脂膜成型
- 专利标题： Speaker diaphragm molded from poly-biphenol phthalate type resin film
- 专利标题（中）： 扬声器隔膜由聚邻苯二甲酸双苯酚型树脂膜成型
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申请号： US836734申请日： 1977-09-26
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公开(公告)号： US4173701A公开(公告)日： 1979-11-06
- 发明人: Kosaku Murata , Satoshi Takayama , Hirotoshi Niguchi
- 申请人： Kosaku Murata , Satoshi Takayama , Hirotoshi Niguchi
- 申请人地址： JPX Osaka
- 专利权人： Matsushita Electric Industrial Co., Ltd.
- 当前专利权人： Matsushita Electric Industrial Co., Ltd.
- 当前专利权人地址： JPX Osaka
- 优先权： JPX51-118110 19760930
- 主分类号： H04R7/02
- IPC分类号： H04R7/02
摘要：
A speaker diaphragm molded from a poly-bisphenol phthalate type plastic film having ester linkages prepared from an aromatic dicarboxylic acid such as isophthalic acid or terephthalic acid or a mixture thereof and a bifunctional phenol such as bisphenol A. This speaker diaphragm has an excellent low-pitched sound reproducing performance and is further featured by the flat acoustic pressure-frequency characteristic and improved transduce efficiency.
公开/授权文献
- US4703293A Polarized electromagnetic actuator device 公开/授权日：1987-10-27
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