Patent ID: 7740345
Filing Date: 2010-06-22
Classification: B41J

Abstract:
1. An actuator device comprising: a vibration plate including an elastic film which is made of silicon oxide (Si0 2 ) and which is formed on a substrate; and a piezoelectric element formed on the vibration plate and including a lower electrode, a piezoelectric layer, and an upper electrode, wherein the vibration plate has such a stress as to give a tensile stress between 300 MPa and 500 MPa, inclusive, to the piezoelectric element that is in a state of being displaced, wherein the vibration plate further includes an insulation film made of zirconium oxide (Zr0 2 ), and the insulation film has a thickness of not more than 1600 nm, while the elastic film is more than three times as thick as the insulation film.