| 摘要 |
PROBLEM TO BE SOLVED: To provide a piezoelectric electroacoustic transducer in which the gap between a diaphragm and a casing can be sealed surely even if a low viscosity elastic sealant is employed and the oscillation characteristics of the diaphragm are enhanced. SOLUTION: The piezoelectric electroacoustic transducer comprises a square piezoelectric diaphragm 1 bending in the thickness direction upon application of an AC signal between the electrodes, a casing 10 for containing the piezoelectric diaphragm 1, and an elastic sealant 15 for sealing the gap between the circumferential edge part of the diaphragm 1 and the inner side face of the casing 10. A part 10f for supporting at least two opposite sides or the corner part of the diaphragm 1 is provided in the casing 10, a groove part 10g filled with the sealant 15 is provided at a position facing the circumferential edge part of the diaphragm 1 in the casing 10, and a wall part 10h for blocking outflow of the sealant 15 to the bottom wall part 10a of the casing 10 is provided lower than the supporting part 10f at the inner circumference of the groove part 10g.
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