Piezoelectric Mems Microspeaker with Suspension Springs and Dual Electrode to Enhance Sound Pressure Level

This study based on piezoelectric actuating principle to design and realize a high sound pressure level (SPL) MEMS microspeaker for in-ear applications. The proposed suspension-spring design enables larger out-of-plane displacement to improve SPL and the piston movement of diaphragm to generate soun...

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Bibliographic Details
Main Authors: Cheng, Hsu-Hsiang, Huang, Zi-Rong, Lo, Sung-Cheng, Wang, Yi-Jia, Wu, Mingching, Fang, Weileun
Format: Conference Proceeding
Language:English
Subjects:
Acoustic measurements
Acoustics
Electrodes
Fabrication
Micromechanical devices
Resonant frequency
Springs
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Summary:This study based on piezoelectric actuating principle to design and realize a high sound pressure level (SPL) MEMS microspeaker for in-ear applications. The proposed suspension-spring design enables larger out-of-plane displacement to improve SPL and the piston movement of diaphragm to generate sound waves with better quality. Moreover, applying dual electrode pattern on the suspension springs further enhances diaphragm out-of-plane displacement and SPL. Measurements demonstrate the highest SPL above 100dB at 3.13kHz in a 3cm long canal. SPL higher than 70dB is obtained from 400Hz to 8.5kHz with only 2V pp driving voltage and 1.67mm 2 diaphragm. Furthermore, total harmonic distortion (THD) is less than 3% in most of the audio range.
ISSN:2160-1968
DOI:10.1109/MEMSYS.2019.8870822