A Flexible Polyvinylidene Fluoride Film-Loudspeaker
摘要
Polyvinylidene Fluoride (PVDF), a piezoelectric polymer, is suitable for flexible devices because of its flexibility and lightweight. In this article, the authors adopt commercial PVDF film to make a flexible PVDF film-loudspeaker. The proposed flexible PVDF film-loudspeaker is a sandwiched membrane structure which contains a PVDF film sandwiched in between two silver electrode-layers. An audio signal is applied to the PVDF film, which responds by the mechanical deflection in proportion to the voltage applied across the PVDF film, thus converting electrical energy into mechanical vibration. Therefore, the coupled electromechanical characteristic of the composite membrane dominates the performance of the loudspeaker. This work is to find the resonant frequencies and vibration mode shapes of the proposed flexible PVDF film-loudspeaker as well as its frequency response.