| 摘要 |
PURPOSE:To lower the resonance frequency, by using piezoelectric bimorph formed as a series of band as a sound source, and thus the mechanical impedance of diaphragm system of a piezoelectric speaker is decreased. CONSTITUTION:A piezoelectric bimorph 11 is used as a drive source of a piezoelectric speaker, and the piezoelectric bimorph is formed to a series of band. The bimorph 11 uses the displacement between the circumference and the center, and the shape of connection is as shown in figure. By using the piezoelectric bimorph 11 like this as the sound generating source, the mechanical impedance of oscillation system of the piezoelectric speaker can be lowered, the resonance frequency can be decreased and the playback frequency band can be spread greatly to low tone side. |
