| 摘要 |
In order to simultaneously realize both improvements of the acoustic performance of a bimorph piezoelectric electroacoustic transducing device and the productivity, in a bimorph piezoelectric vibrator 10 in which a disk-like first piezoelectric element 12 is bonded to a first principal surface 11 a of a metal plate 11 , and a disk-like second piezoelectric element 13 is bonded to a second principal surface 11 b of the metal plate 11 , the diameter R 1 of the first piezoelectric element 12 is different from the diameter R 2 of the second piezoelectric element 13 . Furthermore, the diameter R 2 of the second piezoelectric element 13 is made smaller than the diameter R 1 of the first disk-like piezoelectric element 12 , and a lead-wire soldering portion 14 is ensured on the second principal surface 11 b of the metal plate 11 which is in the periphery of the second piezoelectric element 13.
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