Patent ID: 7528530
Filing Date: 2009-05-05
Classification: B41J,H01L

Abstract:
1. A piezoelectric substance having a multi-layer structure comprising single crystal layers or uniaxial crystal layers of a perovskite oxide, expressed by a general formula of ABO 3 in which a main component at the site (A) is Pb, and a main component at the site (B) includes at least three elements selected from the group consisting of Mg, Zn, Sc, In, Yb, Ni, Nb, Ti and Ta, wherein the multi-layer structure comprises: a first crystal phase layer having any crystal structure selected from the group consisting of tetragonal, rhombohedral, pseudocubic, orthorhombic and monoclinic crystals; a second crystal phase layer having any crystal structure selected from the group consisting of tetragonal, rhombohedral, pseudocubic, orthorhombic and monoclinic crystals, but different from the crystal structure of the first crystal phase; and a boundary layer between the first crystal phase layer and the second crystal phase layer, and having a crystal structure gradually changing in a thickness direction of the layer.