Patent ID: 7497962

Claim:
A method of manufacturing a liquid discharge head comprising a pressure generating chamber communicating with a discharge port for discharging liquid, and a piezoelectric element which is provided corresponding to the pressure generating chamber and includes a piezoelectric material film and a pair of electrode films sandwiching the piezoelectric material film, comprising: a step of preparing a structure with a single crystal Si layer accumulated above a front surface of an Si substrate with an etching stop layer intervening between the single crystal Si layer and the front surface of the Si substrate;; a step of forming a buffer layer on the single crystal Si layer; a step of forming, above the buffer layer, the piezoelectric material film comprising a single crystal thin film or a thin film which is directed in a preferential orientation to a direction of the polarization with one of the pair of electrode films intervening between the buffer layer and the piezoelectric material film;; a step of forming the pressure generating chamber on the piezoelectric material film; and a step of etching a location corresponding to the piezoelectric material film of the Si substrate from a rear surface of the Si substrate to reach the etching stop layer.