Patent ID: 8109144

Claim:
An inertia sensor comprising: a substrate; a flat proofmass formed over the substrate and having a stacked structure including at least a lower electrode, a piezoelectric film, and an upper electrode; an anchor unit formed in a cutout inside of the proofmass and fixed on the substrate; and a plurality of flat piezoelectric beams formed in the cutout inside of the proofmass, each of the flat piezoelectric beams having a first end connected to the proofmass and a second end connected to the anchor unit, and having a stacked structure including at least a lower electrode, a piezoelectric film, and an upper electrode, the inertia sensor detecting an acceleration applied on the proofmass based on charges generated to the electrodes of the piezoelectric beams, wherein each of the piezoelectric beams has a T-shape in which the piezoelectric beam is connected to the proofmass at two positions, and wherein a shape of the cutout inside of the proofmass is conformal to a shape of the anchor unit and the piezoelectric beams.