| 摘要 |
PROBLEM TO BE SOLVED: To overcome the problem such that, in a piezoelectric speaker having an accordion-shaped oscillating board, a large peak in the vicinity of f0 appeared in the sound pressure frequency characteristics should be flattened, and especially as a way for resolving it, to resolve the problem that away for decentralization of the f0 by changing unique parameters, such as intervals of wave-shaped peaks and bottoms, depth, curvature and the like, of the oscillating board, and a way for smoothing the peak in the vicinity of the f0 by reducing the Q0 should be in more efficient manner. SOLUTION: In a piezoelectric speaker, the unit is divided into groups, especially into each unit having different parameters. Then partition boards are inserted between the groups, so that an effect to the operation of adjacent groups is reduced and also the f0 of each group is decentralized.
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