Jianq Chyun IP Office
Electret loudspeaker device
An electret loudspeaker device including a diaphragm, a first perforated electrode and a first spacer is provided. The diaphragm includes a first electret, a second electret, a polymer layer and an electrode layer. At least one layer of the first electret or the second electret is formed by expanded polytetrafluoroethylene. The second electret is stacked on one side of the first electret, while the electrode layer is stacked on the opposite side of the first electret. The polymer layer is made of a hydrophobic material and is disposed on the second electret. The first perforated electrode is stacked on a first spacer and close to the polymer layer. The first spacer disposed between the diaphragm and the first perforated electrode supports the first perforated electrode over the diaphragm and defines a first chamber. A fabrication method of the electret loudspeaker device is also provided.
National Taiwan University
B H B H B B
B32B H04R B32B H04R B32B B32B
additional additional additional inventional inventional additional
Wen-Hsin Han-Lung Chih-Kung Hsu-Ching Yu-Chi
Hsiao Chen Lee Liao Chen