| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric speaker with a low profile wherein a power loss can be reduced by decreasing a contact resistance without deteriorating the sound quality. SOLUTION: A piezoelectric element 14 on the surface of which an electrode layer is provided is adhered to a principal face of a diaphragm 12 of the piezoelectric speaker 10. The piezoelectric element 14 is formed to have a structure wherein at least three or more piezoelectric layers 16 and electrode layers 16 are alternately laminated to obtain a sufficient drive force. A conduction path 20 comprising a belt-like metallic foil and on the rear side of which an adhesive layer 22 is provided is provided to the surface of the electrode layer 16. Further, it does not matter whether or not the adhesive layer 22 has conductivity. Conductive paste with low rigidity and a high volume resistivity is coated over the conduction path 20 and the surface of the electrode layer 16 to form conductive layers 24 to 26 whose Young's modulus is 100 MPs or below and whose volume resistivity is 6×10<SP>-3</SP>Ωcm or below. COPYRIGHT: (C)2006,JPO&NCIPI
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