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標題Title: FLEXIBLE MICROSPEAKER BASED ON BIMORPH PIEZOELECTRIC TRANSDUCER
作者Authors: 黃舜暉,Cheng-Hsin Chuang..等
上傳單位Department: 機械工程系
上傳時間Date: 2009-11-27
上傳者Author: 黃舜暉
審核單位Department: 機械工程系
審核老師Teacher: 莊承鑫
檔案類型Categories: 文宣Literature
關鍵詞Keyword: PVDF, Microspeaker, Bimorph, FEM
摘要Abstract: In order to enhance the sound pressure level in the low frequency range, a polymer-based piezoelectric thin film (PVDF) was utilized in this study instead of ceramic piezoelectric material such as PZT. In addition, a ring-type bimorph piezoelectric transducer was designed to excite a polymeric diaphragm, PDMS thin film, for improving the sound pressure in the low frequency range (<5KHz). Due to the microspeaker was mostly made by polymer-based material; therefore, it exhibits excellent mechanical flexibility for bending deformation, which can not be achieved by ceramic piezoelectric material. Also, the sound pressure level of microspeaker with PDMS diaphragm in the low frequency range was larger than microspeaker with Al diaphragm as indicated in the experimental results. Generally, the enhancement of sound pressure in the low frequency range is due to the light weight and low stiffness of PDMS thin film. Besides, the quality of sound showed low distortion within full frequency range from 200 to 20K Hz. Consequently, a flexible microspeaker was designed and fabricated in this study, the results cab provide the possibility of wearable electronics and flexible consumer products as well as the miniaturization of traditional loudspeaker.

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2009_11_d90eaca7.pdf 554Kb pdf 332 397
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