Patent ID: 7827658

Claim:
A method for manufacturing an actuator device including a substrate, a vibration plate, and a piezoelectric element, respectively placed in a stacked manner, the method comprising: forming the vibration plate, wherein the steps for forming the vibration plate include: forming a silicon oxide elastic film on the surface of the substrate; forming a columnar crystalline zirconium layer on the silicon oxide elastic film with an average crystal grain size of about 20 to 50 nm which shows an XRD pattern having a (002) plane peak with an FWHM of 0.4 degrees or less using a DC sputtering method performed at a temperature between room temperature and 100° C. at a pressure of between 0.3 to 1 Pa at a power density of between 1 to 20 kW/m 2 ; and thermally oxidizing the columnar crystalline zirconium layer in a diffusion furnace heated to between 600 to 1000° C. at a speed of 300 mm/min or more such that the columnar crystalline zirconium layer is oriented in the (−111) plane; and forming the piezoelectric element on the vibration plate, including a lower electrode formed on the columnar crystalline zirconium layer, a piezoelectric layer of lead titanate zirconate formed on the lower electrode, and an upper electrode formed on the piezoelectric layer.