Patent ID: 7565723

Claim:
A piezoelectric actuator fabrication method in which a piezoelectric material layer is formed by ejecting a carrier gas containing particles of a piezoelectric material onto one surface of a substrate to cause the particles to adhere to the one surface of the substrate, comprising: providing on the one surface of the substrate, a film-deposition permitting region to which the particles adhere until a film is formed when the carrier gas is ejected onto the one surface of the substrate and a film-deposition inhibiting region which inhibits the adhesion of the particles in a form of a film thereto; and forming the piezoelectric material layer on the film-deposition permitting region by ejecting the carrier gas containing the particles onto the one surface of the substrate that has undergone the film deposition region formation, wherein: in forming the film deposition region, the film-deposition permitting region and the film-deposition inhibiting region are made different by changing the mutual surface hardness, and the value of the ratio between the Vickers hardness Hv (b) of the film-depositition permitting region and the Vickers hardness Hv (p) of the particles is in the range 0.39≦Hv (p)/Hv (b)≦3.08 and the ratio between the Vickers hardness Hv (b) of the film-deposition inhibiting region and the Vickers hardness Hv (p) of the particles is a value less than 0.39 or exceeding 3.08.