Abstract: An inkjet head unit includes a printhead comprising: a flow-path unit having nozzles and pressure chambers communicated therewith; an actuator unit having a piezoelectric sheet extending across the chambers and having thereon individual electrodes positioned correspondingly to the chambers and a common electrode on the side opposite to the individual electrodes, the actuator unit being fixed to the flow-path unit to vary the volume of each chamber; a dielectric film formed on a surface of the actuator unit opposite to the flow-path unit to extend over regions corresponding and not corresponding to the chambers, the film having through-holes and a dielectric constant lower than that of the sheet; first wires formed on a surface of the film opposite to the actuator unit to extend in a substantially same direction; and second wires extending through the through-holes and connecting the respective individual electrodes to the first wires.

Abstract: An inkjet head is provided with a plurality of pressure chambers, each of which is configured such that an end thereof is connected to a discharging nozzle and the other end is connected to an ink supplier, and an actuator unit for the plurality of pressure chambers. The actuator unit is formed to be a continuous planar layer including at least one inactive layer arranged on a pressure chamber side and at least one active layer arranged on a side opposite to the pressure chamber side with respect to the inactive layer, the planar layer covering the plurality of pressure chambers. The at least one active layer is sandwiched between a common electrode and a plurality of driving electrodes arranged at positions corresponding to the plurality of pressure chambers. The continuous planar layer includes a plurality of active layers or a plurality of inactive layers.

Abstract: An ink-jet head includes a passage unit including a plurality of pressure chambers each connected with a nozzle and arranged in a matrix in a plane to form a plurality of pressure chamber rows in a first direction in the plane, and a plurality of common ink passages each extending along the first direction and communicating with the pressure chambers.

Abstract: An inkjet head includes a cavity plate having a plurality of pressure chambers arranged in matrix, a piezoelectric sheet laminated on the cavity plate, and a power supply board. A plurality of substantially rhombus driving electrodes are formed on the piezoelectric sheet in a matrix at positions corresponding to the pressure chambers. A first contact land extends from one of the acute angle corners of each driving electrode. The driving electrodes are arranged such that the first contact land extending from one driving electrode is placed between two driving electrodes adjacent to said one driving electrode. The power supply board has a plurality of second contact lands formed at positions corresponding to the first contact lands. The second contact lands are connected with respective ones of the first contact lands for power supply.

Abstract: An ink-jet head comprising a passage unit including pressure chambers having one end connected with a nozzle and the other end to be connected with an ink supply source, and an actuator unit fixed to a surface of the passage unit for changing the volume of each pressure chamber. The actuator unit is disposed to extend over the pressure chambers. In the passage unit, the pressure chambers are arranged along a plane to neighbor each other, wherein one nozzle communicates with two or more pressure chambers.

Abstract: A method for manufacturing an ink-jet head, including forming a mark for indicating the positions of pressure chambers on a surface of a passage unit; preparing a member containing a piezoelectric sheet on which a common electrode is supported; attaching the member to the surface of the passage unit; and forming individual electrodes, based on the mark, on a face of the member facing the direction opposite to the attached face thereof to the passage unit.

Abstract: The liquid discharge device of the present invention comprises a piezoelectric actuator 11 and a flow passage member 21. The piezoelectric actuator 11 has a plurality of driving electrodes 15 formed on a piezoelectric ceramic layer 14, and a plurality of piezoelectric displacement elements 16 disposed longitudinally and laterally with regularity. In the flow passage member 21, a plurality of liquid compressing chambers 23 are formed with liquid outlet orifices 22. The piezoelectric actuator 11 is placed on the flow passage member 21, so that the driving electrodes 15 correspond in position to the liquid compressing chambers 23. A plurality of piezoelectric displacement elements 16 are disposed longitudinally in N lines (N?4) and have dot density of not less than 300 dpi in lateral direction. The ratio (B/A) of arrangement interval B between the driving electrodes 15 in longitudinal direction to arrangement interval A between the driving electrodes 15 in lateral direction is 0.95 to 1.5.

Abstract: An ink-jet head having a passage unit including pressure chambers each having one end coupled to a nozzle and the other end to be coupled to an ink supply source. The pressure chambers are arranged along a plane to neighbor each other. The ink-jet head further includes actuator units attached to a surface of the passage unit for changing the volume of each pressure chamber. Each actuator unit includes pressure generation portions respectively corresponding to pressure chambers, and is formed to extend over the pressure chambers. The actuator units are arranged along the longitudinal direction of the passage unit so that each neighboring actuator units partially overlap each other in the lateral direction of the passage unit. Each actuator unit has a basic region where many pressure generation portions are formed in a matrix, and an additional region neighboring the basic region in the lateral direction of the passage unit.

Abstract: An ink-jet head having a passage unit including pressure chambers each having one end coupled to a nozzle and the other end to be coupled to an ink supply source. The pressure chambers are arranged along a plane to neighbor each other. The ink-jet head further includes actuator units attached to a surface of the passage unit for changing the volume of each pressure chamber. Each actuator unit includes pressure generation portions respectively corresponding to pressure chambers, and is formed to extend over the pressure chambers. The actuator units are arranged along the longitudinal direction of the passage unit so that each neighboring actuator units partially overlap each other in the lateral direction of the passage unit. Each actuator unit has a basic region where many pressure generation portions are formed in a matrix, and an additional region neighboring the basic region in the lateral direction of the passage unit.

Abstract: A controller of an ink jet head includes a waveform information storage section for storing waveform patterns concerning a plurality of types of drive signals capable of making positions of dots formed on print paper by ejecting ink from nozzles different from each other with respect to a predetermined direction orthogonal to a relative moving direction between the print paper and the ink jet head. The controller further includes a waveform selection section for selecting one drive signal from among the plurality of drive signals stored in the waveform information storage section so that the same type of drive signal is not selected n or more successive times (where n is a natural number of two or more) for each nozzle.

Abstract: An ink-jet head includes a passage unit including a nozzle plate unit having a nozzle plate in which nozzles are formed, and a main unit fixed on the nozzle plate unit in a laminating direction and having a plurality of pressure chambers, each of the plurality of pressure chambers having one end connected with a nozzle and an other end connected with an ink supply source, the plurality of pressure chambers arranged along a plane to neighbor each other, and an actuator unit, fixed on a side of the main unit opposite to a side in which the main unit is fixed on the nozzle plate unit, for changing the volume of each of said pressure chambers.

Abstract: Each actuator unit is a lamination of four piezoelectric sheets, and individual electrodes are provided on the piezoelectric sheet. Each individual electrode includes a main electrode region disposed at such a position to be opposed to a pressure chamber and a connection electrode region extending on one side of the main electrode region and has a land on its surface. The individual electrode is formed with auxiliary electrode portions extending from a portion of the main electrode region close to the boundary between the main electrode region and the connection electrode region toward two other individual electrodes, respectively, located adjacent to the individual electrode concerned on both sides of the land. The auxiliary electrode portions are provided with proximate portions close to the two other individual electrodes, respectively, and are opposed to pressure chambers opposed to the two another individual electrodes, respectively.

Abstract: A method for manufacturing an ink-jet head, including forming a mark for indicating the positions of pressure chambers on a surface of a passage unit; preparing a member containing a piezoelectric sheet on which a common electrode is supported; attaching the member to the surface of the passage unit; and forming individual electrodes, based on the mark, on a face of the member facing the direction opposite to the attached face thereof to the passage unit.

Abstract: Individual electrodes each substantially shaped like a parallelogram are arranged on a piezoelectric sheet in an actuator unit. A land portion is electrically connected to one of acute-angled portions of each individual electrode. Each land portion is disposed between other two adjacent individual electrodes. A C-shaped groove portion is formed around each land portion so as to pierce the piezoelectric sheet along the outer shape of the land portion.

Abstract: There is provided an inkjet head printing device, which includes an inkjet head having an ink flow channel unit and a piezoelectric actuator unit, and a pulse generator that determines first pulse patterns to be applied to electrodes respectively corresponding to nozzles determined to eject the ink, each of the first pulse patterns having a first potential which causes each of the plurality of nozzles to eject the ink. The pulse generator further determines a second pulse pattern to be applied to at least one of electrodes respectively corresponding to nozzles determined not to eject the ink, the second pulse pattern having a second potential which does not cause each of the plurality of nozzles to eject the ink.

Abstract: An ink-jet head comprises a reservoir unit that includes an ink reservoir. The reservoir unit includes an introduction passage that connects an ink introduction port and an inflow port facing the ink reservoir, and a filter that extends within the introduction passage. The introduction passage has such a configuration that, on both sides of the filter, ink can flow along the filter toward the inflow port. An ink non-passing area is formed within the reservoir unit. The ink non-passing area extends continuously, from at least a part of an area on a plane of the filter opposed to the inflow port, in a direction away from the inflow port.

Abstract: A method of manufacturing an ink jet printing head includes: forming a first laminated structure by laminating at least two metal plates having a hole formed thereon and fixing the metal plates to one another by metal-metal junction, and by laminating a plurality of thin plate members having a hole formed thereon, the thin plate members including the metal plates, and fixing the thin plate members to one another; forming a second laminated structure that includes at least a part of a common ink chamber, by laminating a plurality of thin plate members having a hole formed thereon and fixing the thin plate members to one another; and fixing the first laminated structure and the second laminated structure to each other while laminating the first laminated structure and the second laminated structure on each other.

Abstract: 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??/??1 are satisfied, where L represents the length of the shorter diagonal and ? represents a length of a driving electrode extending in parallel with the width L.

Abstract: An inkjet printing head including: a common ink chamber having an outlet; and an individual ink flow path having a pressure chamber and leads ink from the outlet of the common ink chamber to a nozzle through the pressure chamber, wherein the common ink chamber and the individual ink flow path are formed of a plurality of thin plate members having holes formed thereon, the thin plate members being laminated and fixed onto one another by metal-metal junction, and wherein sectional area of the common ink chamber along a planar direction of the thin plate members is configured to be smaller at an end portion where the outlet is provided than at a central portion in a direction of thickness of the plurality of thin plate members.

Abstract: An inkjet printing head includes: a flow path unit including pressure chambers arranged along a plane and connected to nozzles respectively; and an actuator unit being fixed to a surface of the flow path unit and changes volume of each of the pressure chambers, the actuator unit including: a plurality of individual electrodes each arranged in positions opposite to the pressure chambers respectively; a common electrode provided to extend over the pressure chambers; and a piezoelectric sheet provided between the common electrode and the individual electrodes, wherein actuator elements in which configured by laminating each of the individual electrodes, the common electrode and the piezoelectric sheet, are formed in a different structure depending on a position in the actuator unit, the position where each of the actuator elements is disposed.