Patent ID: 7771780

Claim:
A method of producing a piezoelectric actuator, the method comprising: forming a first electrode layer having a plurality of first electrodes on a substrate by jetting an aerosol containing conductive particles and ceramic particles onto the substrate so as to adhere the conductive particles and the ceramic particles to the substrate; forming a piezoelectric layer on the first electrode layer and the substrate by jetting an aerosol containing piezoelectric particles onto both the first electrode layer, so as to adhere the piezoelectric particles to the first electrode layer, and the substrate; performing an annealing treatment for the piezoelectric layer to develop piezoelectric characteristics in the piezoelectric layer; forming, on the piezoelectric layer, a second electrode layer pairing with the first electrode layer; and forming a diffusion-preventive layer, which prevents an element from diffusing into the piezoelectric layer, between the substrate and the piezoelectric layer only at a portion which faces the first electrode layer, wherein the annealing treatment is performed to cause an element contained in the substrate to diffuse into portions of the piezoelectric layer, which are formed directly on the substrate.