A speaker that operates using the inverse piezoelectric effect of a piezoelectric material is called a piezoelectric speaker. Dielectrics (such as quartz, sodium potassium tartrate and other crystals) are polarized under pressure to cause a potential difference between the two ends of the surface, which is called "piezoelectric effect". Its inverse effect, that is, the dielectric placed in the electric field undergoes elastic deformation, called "inverse piezoelectric effect" or "electrostriction".
Compared with an electric speaker, a piezoelectric speaker does not require a magnetic circuit, and does not require a bias voltage compared with an electrostatic speaker. The structure is simple and inexpensive, and the disadvantage is that the distortion is large and the operation is unstable.
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