Patent ID: 7605523
Filing Date: 2009-10-20
Classification: G06F,H01L

Abstract:
1. A piezoelectric device comprising a non-piezoelectric substrate, a piezoelectric film formed on the substrate, a first electrode, and a second electrode; wherein at least one of the first electrode and the second electrode is interposed between the substrate and the piezoelectric film, and made of an Al alloy containing approximately 0.1 to 3 wt % of at least one metal selected from the group consisting of Ti, Cr, Ni, Cu, Zn, Pd, Ag, Hf, W, Pt and Au; at least one of the first electrode and the second electrode includes a base portion, and a plurality of branch electrodes that extend out from the base portion and are parallel to one another; and h/λ has a value in range of approximately 0.005 to 0.1, wherein h is a thickness of the piezoelectric film, and λ is an electrode period of the plurality of branch electrodes, λ having a value in range of approximately 100 to 150 μm.