压电驻极体材料与电声器件  

Piezoelectret Material and Electroacoustic Device

作　　者：吴宗汉[1] 欧阳小禾 朱彪 

机构地区：[1]东南大学物理系,江苏南京210096 [2]深圳豪恩声学股份有限公司,广东深圳518109

出　　处：《电声技术》2010年第9期17-20,共4页Audio Engineering

摘　　要：含封闭孔洞结构的聚合物薄膜经过适当的电极化处理后表现出突出的压电活性。由于它同时具有压电材料和驻极体的特点,被命名为压电驻极体。说明了压电驻极体薄膜的制备方法,以及在传声器上的应用,并给出了制备样品的电声参数:采用的压电驻极体薄膜的准静态压电系数d33为200pC/N,其制成的传声器灵敏度为-61.74dB,与理论计算结果相符。新型的压电传声器的优点在于其设计简单,体积小,可靠性高和成本低,同时外观和尺寸有较大可变空间范围。After proper electric charging, polymer foams show the behavior similar to ferroelectric material. Since the charged polymer foams combine the characteristics of ferroelectric materials （hysteresis loop） and electrets （surplus charges）, they are named piezoelectret. A method of preparation piezoelectret films and the application in microphone are introduced. The electroacoustic parameter of such microphone, the quasi-static piezoelectric d33 coefficients of the piezoelectret films are 200 pC/N, and the sensitivity of such microphone is -61.74 dB. The test result is close to theoretical calculations values. Advantages of these new piezoelectric microphones include their simple design, small dize, high reliability, and low cost, as well as a large range of shapes and sizes possible.

关 键 词：压电驻极体 传声器 电声器件 

分 类 号：TN641[电子电信—电路与系统] TN643