| 摘要 |
PROBLEM TO BE SOLVED: To provide a transducer that improves quality of sound and reduces harm to environment. SOLUTION: The transducer is for reproduction and/or recording of sound and mainly composed of a membrane 2 of an integrated type or with one or more piezoelectric elements 4. The membrane 2 comprises two or more layers 6 and 7, and at least one layer 7 of them is made of polymer. COPYRIGHT: (C)2004,JPO
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