Patent ID: 8491103

Claim:
An inkjet head comprising: a nozzle plate which is provided with plural nozzles aligned in a first direction, a channel substrate which is provided with plural individual ink chambers aligned in the first direction and corresponding to the plural nozzles and plural ink channels aligned in the first direction and corresponding to the plural nozzles such that each of the ink channels communicates with the corresponding nozzle through the corresponding individual ink chamber, the nozzle plate being bonded to one surface of the channel substrate; a multi-interconnect structure which is formed on the other surface of the channel substrate, including a vibration layer formed on the other surface of the channel substrate, plural piezoelectric elements formed on the vibration layer at areas corresponding to the plural individual ink chambers to be aligned in the first direction, each of the piezoelectric elements including a first electrode, a piezoelectric layer and a second electrode stacked in this order, the first electrode being a common electrode commonly provided for the plural piezoelectric elements and is extended to areas corresponding to the plural ink channels, and a common electrode interconnect electrically connected to the first electrode and formed at areas corresponding to the plural ink channels to be extending in the first direction, the common electrode interconnect including a first common electrode interconnect and a second common electrode interconnect which has a thickness thicker than that of the first common electrode interconnect; and a support substrate which is bonded to the channel substrate through the multi-interconnect structure, the support substrate being provided with a first concave portion at a surface facing the channel substrate at an area corresponding to the second common electrode interconnect to accommodate the second common electrode interconnect.