Patent ID: 7475461

Claim:
A method of manufacturing a piezoelectric thin film element, comprising: forming a bottom electrode above a diaphragm; forming a piezoelectric thin film above the bottom electrode; and forming a top electrode above the piezoelectric thin film; wherein said step of forming the piezoelectric thin film comprises: (a) applying a coating onto the bottom electrode and then performing drying and pyrolyzing to form a first precursor layer above the bottom electrode; (b) annealing the first precursor layer by heating to form a first layer; (c) patterning the first layer and the bottom electrode; (d) applying the coating onto both the first layer remaining after the step of patterning and the diaphragm, and then performing drying and pyrolyzing to form a second precursor layer above the diaphragm and the first layer remaining after the step of patterning; and (e) annealing the second precursor layer by heating to form a second layer having a thickness greater than that of the first layer.