Patent ID: 7744198

Claim:
An inkjet head printing device, comprising: an inkjet head that has an ink flow channel unit including a plurality of nozzles for ejecting ink and a plurality of pressure chambers respectively provided for the plurality of nozzles, and a piezoelectric actuator unit including a plurality of electrodes which are provided to apply pressure by using an piezoelectric effect to their respective pressure chambers to eject ink from the respective ones of the plurality of nozzles; and a pulse controller that generates a plurality of types of ejection pulse patterns having different phases, and drives the plurality of electrodes corresponding to the plurality of nozzles which are to eject the ink using the plurality of types of ejection pulse patterns, wherein each of the plurality of types of ejection pulse patterns has a first pulse part and a pulse train part; first pulse parts of the plurality of types of ejection pulse patterns have different pulse lengths; and pulse train parts of the plurality of types of ejection pulse patterns have different phases and same shapes, wherein the pulse controller drives the plurality of electrodes corresponding to the plurality of nozzles which are to eject the ink so that when a certain electrode of the plurality of electrodes corresponding to a certain pressure chamber of the plurality of pressure chambers is supplied with a first ejection pulse pattern of the plurality of types of ejection pulse patterns, at least one of neighboring electrodes corresponding to neighboring pressure chambers adjacent to the certain pressure chamber is supplied with one of the plurality of types of ejection pulse patterns different from the first ejection pulse pattern, wherein: each of the pressure chambers has a rhombic shape, and each of the electrodes has a rhombic shaped portion and a secondary portion that extends from an acute angle corner of the rhombic shaped portion, at tip of the secondary portion a circular region is formed next to the electrode, the pressure chambers are arranged in a staggered arrangement, and the electrodes are also arranged in a staggered arrangement that corresponds to the staggered arrangement of the pressure chambers; in the arrangement of the pressure chambers, the pressure chambers are aligned in a line in a first direction and are aligned in a line in a second direction; in the arrangement of the electrodes, the electrodes are aligned in a line in the first direction and are aligned in a line in the second direction; and neighboring electrodes in at least the second direction are supplied with different ones of the plurality of types of the ejection pulse patterns, respectively.