Piezoelectric buzzer is an electroacoustic converter. The piezoelectric material is pasted on the metal sheet. When a voltage is applied at both ends of the piezoelectric material and the metal sheet, the buzzer will produce mechanical deformation and sound due to the inverse piezoelectric effect. Characteristics, application and appearance structure of piezoelectric buzzer?
Piezoelectric buzzer has the characteristics of small volume, high sensitivity, low power consumption, good reliability, low cost and good frequency characteristics. Therefore, it is widely used in alarm and sound generation of various electrical products. It is common to use music greeting cards, electronic watches, pocket calculators, electronic doorbells, electronic toys and other small electronic products as sound generating devices.
1. Piezoelectric buzzer is usually circular, which is composed of piezoelectric ceramic sheet, lead and resonant cavity.
2. The piezoelectric ceramic sheet in the middle is composed of metal coating, ceramic sheet, glue and metal sheet.
3. Shapes and circuit symbols of common piezoelectric buzzers.
4. From the electrical point of view, piezoelectric ceramics can be simplified as a series model of an inductor and a capacitor.