| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric speaker having a wide band of the reproduced sound at a low manufacturing cost. SOLUTION: The piezoelectric speaker has electrodes 1 and 3 pasted to the upper and lower surfaces of a piezoelectric element 2 wherein oscillatory parts separated from the contact face of the piezoelectric element 2 are formed on both electrodes 1 and 3 so that the electrodes 1 and 3 act as a diaphragm.
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