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Proceedings Paper

On the improvement for charging large-scale flexible electrostatic actuators
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Paper Abstract

Recently, the development of flexible electret based electrostatic actuator has been widely discussed. The devices was shown to have high sound quality, energy saving, flexible structure and can be cut to any shape. However, achieving uniform charge on the electret diaphragm is one of the most critical processes needed to have the speaker ready for large-scale production. In this paper, corona discharge equipment contains multi-corona probes and grid bias was set up to inject spatial charges within the electret diaphragm. The optimal multi-corona probes system was adjusted to achieve uniform charge distribution of electret diaphragm. The processing conditions include the distance between the corona probes, the voltages of corona probe and grid bias, etc. We assembled the flexible electret loudspeakers first and then measured their sound pressure and beam pattern. The uniform charge distribution within the electret diaphragm based flexible electret loudspeaker provided us with the opportunity to shape the loudspeaker arbitrarily and to tailor the sound distribution per specifications request. Some of the potential futuristic applications for this device such as sound poster, smart clothes, and sound wallpaper, etc. were discussed as well.

Paper Details

Date Published: 29 April 2011
PDF: 14 pages
Proc. SPIE 7979, Industrial and Commercial Applications of Smart Structures Technologies 2011, 79790D (29 April 2011); doi: 10.1117/12.880480
Show Author Affiliations
Hsu-Ching Liao, National Taiwan Univ. (Taiwan)
Han-Long Chen, National Taiwan Univ. (Taiwan)
Yu-Hao Su, National Taiwan Univ. (Taiwan)
Yu-Chi Chen, National Taiwan Univ. (Taiwan)
Wen-Ching Ko, National Taiwan Univ. (Taiwan)
Chang-Ho Liou, National Taiwan Univ. (Taiwan)
Industrial Technology Research Institute (Taiwan)
Wen-Jong Wu, National Taiwan Univ. (Taiwan)
Chih-Kung Lee, National Taiwan Univ. (Taiwan)
Institute for Information Industry (Taiwan)

Published in SPIE Proceedings Vol. 7979:
Industrial and Commercial Applications of Smart Structures Technologies 2011
Kevin M. Farinholt; Steve F. Griffin, Editor(s)

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