Patent ID: 8102098

Claim:
A piezoelectric-driven MEMS element, comprising: a substrate; a forward beam and a backward beam to be arranged in a line symmetry, the forward beam and the backward beam being provided with a lower electrode film, a lower piezoelectric film formed on the lower electrode film, a middle electrode film formed on the lower piezoelectric film, an upper piezoelectric film formed on the middle electrode film and an upper electrode film formed on the upper piezoelectric film, the middle electrode film being thicker than the lower electrode film and the upper electrode film; a connection portion connecting the middle electrode film of the forward beam to the upper electrode film and the lower electrode film of the backward beam, and the upper electrode film and the lower electrode film of the forward beam to the middle electrode film of the backward beam; a fixed portion to be arranged on the substrate and on a side opposite to the connection portion of the forward beam, the fixed portion fixing an end of the forward beam to hold a portion thereof with a gap above the substrate; a fixed electrode portion arranged on the substrate so as to have a capacitive gap between the fixed electrode portion and the other end of the beam; and a power source to apply a voltage between the lower electrode film and upper electrode film of the beam, and the middle electrode film of the beam.