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.
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