发明名称 |
PIEZO ELECTRIC TYPE ELECTRIC SOUND EXCHANGER |
摘要 |
PURPOSE:To raise the confidence for a long period with an even sensitive frequency characteristic by fixing to a fixed equipment, a vibration film made up to a film of polymer material plactic molded beforehand and of an electrode layer installed on both of its sides. |
申请公布号 |
JPS5221823(A) |
申请公布日期 |
1977.02.18 |
申请号 |
JP19750097160 |
申请日期 |
1975.08.12 |
申请人 |
NIPPON TELEGRAPH & TELEPHONE |
发明人 |
SHIRATORI YOSHIO;HIDA MIZUHIRO;OOGA TOSHIROU |
分类号 |
H04R17/00 |
主分类号 |
H04R17/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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