Patent ID: 8567919
Filing Date: 2013-10-29
Classification: B41J,H01L

Abstract:
1. A piezoelectric element comprising: a first conductive layer; a second conductive layer disposed to face the first conductive layer; and a piezoelectric layer disposed between the first conductive layer and the second conductive layer and composed of a compound oxide containing at least lead, zirconium, titanium, and oxygen, wherein the piezoelectric layer includes a first crystal layer disposed on the first conductive layer side of the piezoelectric layer and a second crystal layer continued from the first crystal layer and disposed nearer to the second conductive layer side than the first crystal layer; in the piezoelectric layer, the lead concentration in the first conductive layer side of the first crystal layer is lower than that in the second conductive layer side of the second crystal layer; and in the piezoelectric layer, the oxygen concentration in the first conductive layer side of the first crystal layer is higher than that in the second conductive layer side of the second crystal layer, wherein the concentration of each element in the piezoelectric layer is defined by the following equation: where the relative sensitivity factor is a value normalized with respect to an average peak intensity of a stable region and a composition ratio.