| 摘要 |
An inkjet head has a plurality of pressure chambers. An end of each pressure chamber is connected to a discharging nozzle and the other end to an ink supplier. The pressure chamber has a rhombic shape having longer and shorter diagonals. The inkjet head further includes an actuator unit, which has at least one planar piezoelectric layer covering over the plurality of pressure chambers, a common electrode provided on one side surface of one of the at least one planar piezoelectric layer, and a plurality of driving electrodes provided for the pressure chambers, respectively. The plurality of driving electrodes are formed on the other side of the one of the at least one planar piezoelectric layer. Further, conditions: 0.1 mm<=L and 0.29<=delta/lambd<=1 are satisfied, where L represents the length of the shorter diagonal and delta represents a length of a driving electrode extending in parallel with the width L.
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