Patent ID: 7156500

Claim:
A liquid-jet head comprising: a passage-forming substrate having a pressure generating chamber, the pressure generating chamber being formed in the passage-forming substrate and communicates with a nozzle orifice for ejecting liquid; and a piezoelectric element provided on one side of the passage-forming substrate via a vibration plate, the piezoelectric element comprising a lower electrode, a piezoelectric layer, and an upper electrode, wherein the lower electrode is patterned such that at least one end face thereof is located in a region facing the pressure generating chamber; the piezoelectric layer comprises a plurality of layers of ferroelectric films; a first ferroelectric film, which is a lowermost layer of the plurality of layers of ferroelectric films, is provided only on the lower electrode such that an end face thereof is aligned with the end face of the lower electrode; the end face of the first ferroelectric film and the end face of the lower electrode are sloped at an angle of 10° to 50° with respect to the vibration plate; and other ferroelectric films formed on the first ferroelectric film are provided in such a manner as to overlie the sloped end face of the lower electrode and the sloped end face of the first ferroelectric film.