Fabrication method of piezoelectric bimorph: piezoelectric diaphragms is an electronic product that uses the piezoelectric effect of piezoelectric ceramics to work and sound. It has the advantages of low power consumption, low cost, high reliability, anti bad working environment and less vulnerable to electromagnetic interference. It is widely used in the fields of household appliances, mechanical equipment, automobile anti-theft, home security and so on. The structure of piezoelectric buzzer sheet is to paste piezoelectric ceramic sheet on metal substrate (generally copper sheet or stainless steel sheet), and silver paste is printed on both sides of piezo disc as electrode material. When the high-frequency AC signal is loaded on the buzzer, the piezoelectric ceramic sheet produces the corresponding regular geometric deformation due to the piezoelectric effect, which drives the metal substrate to vibrate and produce sound