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Title: Combined piezoelectric vibrator and preparation method thereof
Other Titles: 一种复合压电振子及其制备方法
Authors: Zhou, D 
Zhang, GF 
Lin, GH 
Chen, Y 
Dai, JY 
Chen Wang, LH 
Issue Date: 18-Jul-2012
Publisher: 中华人民共和国国家知识产权局
Source: 中国专利 ZL 201110001124.8 How to cite?
Abstract: The invention discloses a combined piezoelectric vibrator and a preparation method thereof. The combined piezoelectric vibrator comprises a plurality of piezoelectric columns which are distributed in arrays. The piezoelectric columns are bonded into a combined body through polymers. The upper surface of the combined body is an inwards concave curved surface. The upper end surfaces of the piezoelectric columns are exposed out of the upper surface of the combined body. The lower end surfaces of the piezoelectric columns are exposed out of the lower surface of the combined body. Two layers of electrode materials are respectively plated on the upper surface and the lower surface. By adopting the scheme, since the upper surface which is used as a transmitting surface of the piezoelectric vibrator is inwards concave, the energy of sound waves can be concentrated in an area required to be detected, the sensitivity and the lateral resolution of an ultrasonic transducer can be improved, the electromechanical coupling factor is improved and the mechanical quality factor is effectively reduced. Besides, since the upper surface of the piezoelectric vibrator is inwards concave and focused, sound lens materials are not required to be additionally used, the structure of the ultrasonic transducer is simplified and the energy loss caused by a sound lens during sound wave transmission is reduced.
Rights: 专利权人: The Hong Kong Polytechnic University.
Appears in Collections:Patent

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