Patent ID: 7320163

Claim:
A method of manufacturing an actuator device which comprises the steps of: forming a vibration plate on one side of a substrate; and forming on the vibration plate, a piezoelectric element including a lower electrode, a piezoelectric layer, and an upper electrode, wherein the step of forming the vibration plate includes a step of forming a zirconium layer, and thermally oxidizing the zirconium layer at a predetermined temperature to form an insulation film made of zirconia, the insulation film being an uppermost layer of the vibration plate and having a surface roughness ranging from 1 nm to 3 nm, and wherein the step of forming the piezoelectric element includes a step of applying titanium onto the lower electrode by use of a sputtering method, and forming a seed titanium layer thereon; and a step of forming a piezoelectric precursor film by applying a piezoelectric material onto the seed titanium layer, and forming the piezoelectric layer by baking and crystallizing the piezoelectric precursor layer.