| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric diaphragm which is used for a sounding body, reduced in thickness, improved in the reliability of extracting electrodes, simplified in manufacturing process, and reduced in the amount of a material for use. SOLUTION: Electrode layers 22A to 22C, 24A to 24C are formed on primary surfaces of piezoelectric layers 20A and 20B. Signal voltages of different polarities are applied to the electrode layers adjacent to each other on the same primary surfaces or the electrode layers facing each other through the piezoelectric layer, respectively. Projecting shapes 30 and 32 reaching each other's regions are formed at edges at which the second electrode layers 22B and 24B face each other, and through-holes 26A and 26B are formed at the piezoelectric layers 20A and 20B at positions off a dividing line 38. The electrode layers 22A to 22C are connected to each other by the through-holes 26A and 26B and the projecting shape 30, so that the electrode layers 22A to 22C are kept at the same potential and extracted out of a diaphragm 12 side, and thus the piezoelectric diaphragm can be reduced in height as a whole. Through-hole connections are made at the position at which some electrode layers overlap with each other, so that electrically-conductive connections can be improved in reliability. COPYRIGHT: (C)2007,JPO&INPIT
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