Patent ID: 10155382

Abstract:
An ink jet print head 1 includes: a pressure chamber (cavity) 7; a movable film formation layer 10 arranged on the pressure chamber 7 and including a movable film 10A defining a ceiling surface portion of the pressure chamber 7; a piezoelectric element 9 formed on the movable film 10A and including a lower electrode 11, a piezoelectric film 12 formed on the lower electrode 11, and an upper electrode 13 formed on the piezoelectric film 12; and first upper wiring 16. The upper electrode 13 includes a main electrode portion 13A constituting the piezoelectric element 9 and an extension portion 13B as second upper wiring drawn out of the main electrode portion 13A and connected to the first upper wiring 16. The first upper wiring 16 has a portion arranged between the extension portion 13B and the movable film formation layer 10, and, within this portion, the extension portion 13B is connected to the first upper wiring 16.