Patent ID: 8549715

Claim:
A piezoelectric microspeaker fabricated according to a method comprising: forming a lower drive unit by: forming a first drive electrode by depositing a first thin conductive layer on a substrate and etching the first conductive layer, forming a first piezoelectric plate by depositing a first piezoelectric layer on the first drive electrode and etching the first piezoelectric layer, and forming a first common electrode by depositing a second conductive layer on the first piezoelectric plate and etching the second conductive layer; after the forming the lower drive unit, forming a diaphragm by depositing a non-conductive layer on the first common electrode; and forming an upper drive unit by: forming a second common electrode by depositing a third conductive layer on the diaphragm and etching the third conductive layer, forming a second piezoelectric plate by depositing a second piezoelectric layer on the second common electrode and etching the second piezoelectric layer, and forming a second drive electrode by depositing a fourth conductive layer on the second piezoelectric plate and etching the fourth conductive layer.