压电陶瓷(或晶体)受到外来机械力时,其两面会产生电荷,电荷量与压力成正比,这种现象称为压电效应;反之,在其两面施加电压(外电场)就可产生形变(机械振动),称为逆压电效应。在实际应用中,这些统称为压电效应。压电陶瓷发声器件结构简单、能量转换效率高、功耗小、成本低,广泛用作压电扬声器、传声器、超声波延迟 Piezoelectric ceramic (or crystal) by external mechanical force, the two sides will have a charge, the charge is proportional to the pressure, this phenomenon is called the piezoelectric effect; the other hand, in its application of voltage (external electric field) can be deformed (Mechanical vibration), called inverse piezoelectric effect. In practical applications, these are collectively referred to as the piezoelectric effect. Piezoelectric ceramic sound device has the advantages of simple structure, high energy conversion efficiency, low power consumption and low cost, and is widely used as a piezoelectric speaker, a microphone and an ultrasonic delay