Patent ID: 8511798

Claim:
A method of manufacturing a liquid discharge head comprising a flow channel unit comprising a plurality of pressure chambers which are opened on one surface thereof, the method comprising the steps of: manufacturing an actuator unit comprising a piezoelectric layer which covers the pressure chambers, and is adhered to the one surface of the flow channel unit such that the piezoelectric layer provides a pressure to liquid in the pressure chambers, comprising the steps of: forming a first electrode and a second electrode on the actuator unit to be positioned on a surface of the piezoelectric layer, wherein the second electrode is thicker than the first electrode; and forming a conductive layer which is laminated on the first electrode, wherein the conductive layer comprises a material subject to deformation by a pressurizing force, such that the sum of the thicknesses of the conductive layer and the first electrode is larger than the thickness of the second electrode prior to the fixing step; positioning the actuator unit on a cavity plate comprising the one surface of the flow channel unit via a heat cured adhesive agent; and fixing the actuator unit to the cavity plate, wherein the fixing step comprises heating and pressurizing by a jig, and wherein the conductive layer is deformed by the pressurizing force more than the first and the second electrode is each deformed, wherein the conductive layer is plastically deformed such that the thickness of the second electrode and the sum of the thicknesses of the conductive layer and the first electrode become the same after the pressurizing force is applied in the fixing step.