Patent ID: 7708389

Claim:
A liquid jetting head, comprising: a substrate formed with a pressure chamber; a diaphragm formed on the substrate, said diaphragm comprising: a first oxide film; and a second oxide film; wherein said first oxide film consists of SiO 2 ; and a piezoelectric thin film element formed on the diaphragm, wherein said diaphragm bends a first amount in convex form toward said pressure chamber side after manufacture, and bends a second amount in convex form toward said pressure chamber side after a voltage application is completed and an applied voltage is set to zero, wherein the second amount by which said diaphragm bends is no more than 0.4% of the width of said pressure chamber, and wherein said piezoelectric thin film element comprises a piezoelectric thin film constituted by PZT with a degree of (100) face orientation of at least 80%.