What is the principle of a piezoelectric switch?

The piezoelectric switch uses a piezoelectric wafer. The surface layer, that is, the part that the user sees, can be printed, covered or pressed out. The piezoelectric wafer is inserted into a punched insulating layer (sleeve), which is sandwiched between the two conductive sheets that make up the switch contacts. Finally, the entire assembly is supported by a carrier plate. Compared with resistive membrane switches, some of the advantages of piezoelectric switches are:

(1). The piezoelectric effect is a characteristic of some specific crystalline silicon materials, including natural quartz crystals and man-made ceramic materials. When mechanical pressure is applied to these materials, the lattice structure will generate a voltage proportional to the pressure And charge.

(2). Piezoelectric switches only need almost negligible physical movement, usually between 1μm and 10μm to generate usable switching voltage or charge.

(3). The output of the switching element is generated by simply applying external force instead of physical movement.


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