Patent ID: 8670578

Claim:
A piezoelectric actuator, comprising: a piezoelectric element expanding and contracting according to a state of an electric field; a reinforcement member to suppress divided vibration caused by driving of said piezoelectric element; a pedestal bonded to at least one surface of said piezoelectric element; a vibration film having stiffness lower than that of said pedestal to amplify amplitudes of vibration toward a direction of thicknesses of said piezoelectric element and said pedestal; and a support member to support said piezoelectric element and said pedestal through said vibration film, with said pedestal disposed between said piezoelectric element and said vibration film, wherein said reinforcement member is disposed on one surface of said vibration film, overlapping with neither of said pedestal and said piezoelectric element toward a direction of thicknesses of said vibration film, said direction of the thicknesses of said vibration film extending from a top surface of the piezoelectric actuator to a bottom surface of the piezoelectric actuator.