Patent attributes
The inkjet head includes: a plurality of ink discharge nozzles which are arranged two-dimensionally; a plurality of pressure chambers which are in communication with the ink discharge nozzles so as to store ink, the pressure chambers being two-dimensionally arranged in correspondence with the ink discharge nozzles; a plurality of piezoelectric elements; a common electrode which is disposed on pressure chamber sides of the piezoelectric elements; a plurality of discrete electrodes which are disposed on sides of the piezoelectric elements opposite to the common electrode; and a plurality of discrete lead electrodes which feed electricity to the discrete electrodes, wherein: each of the piezoelectric elements is deformed by applying voltage to the common electrode and the discrete electrode so that a volume of the pressure chamber is varied to discharge a droplet of the ink from the ink discharge nozzle; and with respect to each pair of the discrete electrode and discrete lead electrode corresponding to each of the pressure chambers, when T1 is a thickness of the discrete electrode and T2 is a thickness of the discrete lead electrode which feed electricity to the discrete electrode, the discrete electrode and the discrete lead electrode are configured so that T1 and T2 satisfy the following formula: T1<T2.
