| 摘要 |
PURPOSE:To present a piezoelectric audio device capable of displaying the maximum resonance effect of a resonator and obtaining a sound volume higher than ever by fitting an adjustor having a vocalizing hole for adjustment in a vocalizing hole opened in the center of the resonator rotatably freely. CONSTITUTION:An area where the vocalizing hole 3 for adjustment is superimposed on the vocalizing hole 8 of the resonator 1 can be varied freely by rotating the adjustor 2 fitted in the part of the vocalizing hole 8 opened at the resonator 1. Thereby, the area of the vocalizing hole 8 of the resonator 1 actually opened can be adjusted. By using such constitution, it is possible to adjust the resonance frequency of the resonator 1 within a range of some extent, and to respond to the dispersion of the oscillation frequency of a driving power outputted from a driving circuit, and to present the maximum resonance effect of the resonator 1. |
