Patent ID: 7882635

Claim:
A method for producing an ink-jet head, comprising the steps of: manufacturing a flow passage unit including a vibration plate which is made of metal, an ink chamber which is closed by the vibration plate, and a nozzle which is communicated with the ink chamber and which discharges an ink; forming a first buffer layer on the vibration plate; forming, a second buffer layer on the first buffer layer; forming a piezoelectric precursor on the second buffer layer; and heating the flow passage unit, the first buffer layer, the second buffer layer, and the piezoelectric precursor so that the piezoelectric precursor is calcinated into a piezoelectric member, wherein: the first buffer layer is formed of a metal material with which mutual diffusion between the first buffer layer and the piezoelectric precursor during the heating is less than mutual diffusion between the piezoelectric precursor and the vibration plate when the heating is performed without the first buffer layer, and the second buffer layer is formed of a metal material with which mutual diffusion between the second buffer layer and the piezoelectric precursor during the heating is less than the mutual diffusion between the vibration plate and the piezoelectric precursor when the heating is performed without the second buffer layer.