Patent ID: 7900355

Claim:
A method for manufacturing an ink-jet head comprising the steps of: forming a passage unit that has a plurality of pressure chambers, a plurality of nozzles communicating with the respective pressure chambers, and a plurality of wall portions separating the pressure chambers from each other; forming an actuator unit that changes the volume of the pressure chambers to thereby eject ink through the nozzles; the step of forming the actuator unit including the steps of: disposing, at a piezoelectric element, a plurality of surface electrodes and a common electrode, such that the piezoelectric element is sandwiched between the common electrode and the plurality of surface electrodes; forming a plurality of first lands on a surface on which the surface electrodes are disposed, so that the first lands are connected to the respective surface electrodes, the first lands having a higher height from the surface on which the surface electrodes are disposed than that of the surface electrodes; and forming a plurality of second lands on the surface on which the surface electrodes are disposed, so that the second lands are electrically separated from the respective surface electrodes, the second lands having substantially the same height from the surface on which the surface electrodes are disposed as that of the first lands; the method further comprising the steps of: forming an adhesive layer on the wall portions of the passage unit; and positioning the actuator unit onto the passage unit such that the surface electrodes are arranged at positions corresponding to the respective pressure chambers and each of the first and second lands is arranged along a straight line which passes through corresponding one of the wall portions in a direction perpendicular to the surface on which the surface electrodes are disposed, and then disposing a pressurizing member on the surface of the actuator unit, on which the surface electrodes are disposed, to press and adhere the actuator unit to the passage unit.