Patent ID: 8186029

Claim:
A method for producing a piezoelectric actuator having a diffusion-preventive layer and a piezoelectric layer stacked on a vibration plate, the method comprising the steps of: providing the vibration plate having a surface on which a groove is formed, wherein the groove has a first side and a second side on opposing sides of a bottom portion; forming the diffusion-preventive layer by blowing an aerosol containing ceramics particles toward an area on the surface of the vibration plate in which the groove is formed from a plurality of different directions that are angled with respect to the surface of the vibration plate such that the ceramic particles are deposited evenly on the first side, second side, and bottom portion of the groove, wherein the ceramics particles prevent diffusion of an element contained in the vibration plate into the piezoelectric layer; and forming the piezoelectric layer by blowing an aerosol containing piezoelectric material particles toward an area on the surface of the vibration plate in which the diffusion-preventive layer is formed from a direction that is perpendicular to the surface of the vibration plate such that the piezoelectric material particles are deposited with less thickness at the first side and second side of the groove than at the bottom portion of the groove, wherein the piezoelectric material particles generate an electric field when a driving voltage is applied.