Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1994-11-21
1996-04-02
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310318, 310366, H01L 41047, H01L 4108
Patent
active
055043844
ABSTRACT:
A type of piezoelectric transformer (PT) which vibrates in length extensional mode is provided. The piezoelectric transformer (PT) has a piezoelectric substrate which has a first dimension, a second dimension and a third dimension with the first dimension being longest and the third dimension being shortest. The substrate has two polarization directions parallel to the first dimension near two terminals of the first dimension and at least two opposite polarization directions on a central portion of the substrate transversely to the first dimension. The substrate further has at least two electrodes on a portion horizontal to the first dimension. Comparing with traditional piezoelectric transformers, the new one can solve the polarization difficulties and reduce audio noise output without sacrificing the electrical properties or even have better voltage transformation characteristics.
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Chen Yun-Tien
Cheng Syh-Yuh
Lee Yu-Lin
Liao Shu-Fen
Yeh Wen-Chin
Dougherty Thomas M.
Industrial Technology Research Institute
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