| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a piezoelectric diaphragm for preventing or reducing a short-circuit accident happening in the central hole of a ceramic layer. SOLUTION: In a piezoelectric diaphragm 10 to be used for a piezoelectric speaker, a ceramic layer is mounted on at least one side face of a metallic board on an acoustic diaphragm 20 by supporting it with the center. The method for manufacturing the diaphragm 10 comprises a process for forming a central hole 10a at the center of a metallic board 12, a process for mounting a ceramic layer 14 whose both faces are formed with conductive layers 16a and 16b on the metallic board 12, and a process for forming a central hole 10b which is concentric to the central hole 10a of the metallic board 12 in the ceramic layer 14. In this case, the central hole 10b of the ceramic layer 14 is formed by a conical punching tool 50 converging to the top end direction so that a distance between the conductive layers 16a and 16b along the internal face of the central hole 10b of the ceramic layer 14 can be made large. COPYRIGHT: (C)2003,JPO
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