Patent ID: 8994251
Filing Date: 2015-03-31
Classification: B41J,H01L

Abstract:
1. A piezoelectric device comprising: a first electrode film; a first nonmetal electroconductive intermediate film provided on the first electrode film; a piezoelectric film provided on the first nonmetal electroconductive intermediate film; a second nonmetal electroconductive intermediate film provided on the piezoelectric film; and a second electrode film provided on the second nonmetal electroconductive intermediate film, wherein a linear expansion coefficient of the first nonmetal electroconductive intermediate film is larger than a linear expansion coefficient of the first electrode film and a linear expansion coefficient of the piezoelectric film, wherein a linear expansion coefficient of the second nonmetal electroconductive intermediate film is larger than a linear expansion coefficient of the second electrode film and the linear expansion coefficient of the piezoelectric film, and wherein there is no substrate 10 μm or more thick on a top surface of the second electrode film and there is no substrate 10 μm or more thick on a bottom surface of the first electrode film, either.