Patent ID: 7089636

Claim:
A method of manufacturing a piezoelectric thin film element, comprising: a step of forming a bottom electrode on a substrate; a step of forming a piezoelectric thin film on the bottom electrode by a sol-gel process; and a step of forming a top electrode on the piezoelectric thin film; wherein said step of forming the piezoelectric film comprises: (a) a step of applying a sol onto the bottom electrode and then performing drying and pyrolyzing to form a first precursor layer; (b) a step of annealing the first precursor layer by heating from the substrate side to form a first layer; (c) a step of applying the sol onto the first layer and then performing drying and pyrolyzing to form a second precursor layer; and (d) a step of annealing the second precursor layer by heating from the substrate side to form a second layer whose thickness is greater than that of the first layer.