| 摘要 |
An electrostatic transducer, such as a loudspeaker or microphone, comprises a multi-layer panel ( 1 ) incorporating an electrically insulating middle layer ( 2 ) sandwiched between first and second electrically conducting outer layers ( 3, 4 ). At least one of the layers has a profiled surface ( 6 ) where it contacts the surface of another of the layers. Furthermore a signal generator is provided for applying an alternating electrical voltage across the first and second layers ( 3, 4 ) to initiate vibration due to variation of the electrostatic forces acting between the layers, thereby serving as a loudspeaker (or for detecting variation of such electrostatic forces due to received vibration in the case of a microphone). Such a transducer can serve as a low cost audio loudspeaker which can be made lightweight and flexible so as to render it suitable for a wide range of applications, for example to provide sound reproduction in a home environment without requiring any bulky enclosure, or in a notebook computer or mobile telephone.
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