Patent ID: 8104877

Claim:
A recording head comprising: a passage unit which ejects liquid; an actuator unit which is fixed to the passage unit and causes the passage unit to eject liquid; and a flat flexible substrate which is fixed to the actuator unit and provides driving signals to the actuator unit, wherein the actuator unit has a piezoelectric layer having a surface A facing the to substrate, a plurality of individual electrodes placed on the piezoelectric layer, and a plurality of individual bumps placed on the surface A and electrically connected to the respective individual electrodes, wherein the substrate has a base having a surface B facing the actuator unit, a plurality of lands placed on the surface B and bonded to the respective individual bumps, a plurality of wirings placed on the surface B and connected to the respective lands, an insulating land cover layer covering parts of the respective lands other than the bonded points with the respective individual bumps, and an insulating wiring cover layer covering the wirings, wherein the wiring cover layer and the land cover layer are placed on each other to form a layered part so that the wiring cover layer is sandwiched between the land cover layer and the wirings, wherein the piezoelectric layer and the wirings sandwich therebetween at least a part of the layered part, and wherein in the layered part, the land cover layer is fixed to the piezoelectric layer.