Patent ID: 7380318

Claim:
A method of manufacturing a liquid discharge head in which liquid in a pressure generation chamber is pressurized by a piezoelectric driving force of a piezoelectric element, and is discharged from a nozzle communicating with the pressure generating chamber, comprising the steps of: providing a flow passage substrate incorporating the pressure generation chamber; anodically joining a diaphragm to the flow passage substrate; providing an intermediate film on the diaphragm; forming electrode layers and a piezoelectric film of the piezoelectric element on the intermediate film; and crystallizing the piezoelectric film during or after the forming step at a temperature lower than a transition point of the diaphragm; wherein the joining step, the step of providing the intermediate film and the forming step are performed to satisfy a relationship where (thermal expansion coefficient of the intermediate film×Young's Modulus of the intermediate film×thickness of the intermediate film)−(thermal expansion coefficient of the diaphragm×Young's Modulus of the diaphragm×thickness of the diaphragm)≧(thermal expansion coefficient of the piezoelectric film×Young's Modulus of the piezoelectric film×thickness of the piezoelectric film).