Abstract: An ink-jet head includes a passage unit including a plurality of pressure chambers, and a plurality of actuator units attached to a surface of the passage unit for changing the volume of each of the plurality of pressure chambers. The actuator unit has a layered structure laminated with four piezoelectric sheets to. In the actuator unit, individual electrodes are formed at positions respectively corresponding to each of the pressure chambers, only on a face of the uppermost piezoelectric sheet opposite to an attached face of the actuator unit to the passage unit. A common electrode kept at a constant potential is provided on a face of the uppermost piezoelectric sheet at the side facing the passage unit.

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: 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 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: There is provided a method of manufacturing an ink-jet head comprising a passage unit, a piezoelectric actuator, and a wire member. The passage unit has a surface on which a pressure chamber is provided in a form of a recess. The piezoelectric actuator includes a piezoelectric body that closes the recess, an electrode that is formed on the piezoelectric body, and a conductive land that is formed on the electrode. The wire member includes a wiring provided thereon with a terminal electrically connected to the land. The method comprises the steps of forming on the electrode a land made of a resin paste, bonding the passage unit and the piezoelectric actuator to each other by pressing the land except a part thereof in a state where the electrode is opposed to the pressure chamber, and electrically connecting the land to the terminal by bringing the part of the land not pressed in the step of bonding into contact with the wire member.

Abstract: An ink-jet head has a passage component made of resin and a filter plate through which ink is filtered. The filter plate is fixed to the passage component and has a melting point higher than that of the passage component. The filter plate has an annular region and an inner region, and holes are formed through the filter plate in the annular and inner regions. The passage component has a filter support face that is in contact with the annular region but out of contact with the inner region. A holder is formed on the filter support face. The holder penetrates through at least one of the holes formed in the annular region and covers the other face of the filter plate.

Abstract: An inkjet head including a flow path unit and a plurality of actuator units, each of the plurality of actuator units has a parallelogram shape defined by two sets of opposing sides, which is substantially parallel to a first direction and a second direction intersecting with each other along a plane, the side of the actuator unit parallel to the second direction is substantially parallel to that of an adjacent actuator unit and is shifted from that of the adjacent actuator unit in the second direction, the plurality of actuator units are inclined with respect to two contour lines of a flow path unit, the two contour lines being parallel with each other and extending in a longitudinal direction of the flow path unit, and centers of gravity of contours of the plurality of actuator units are arranged on substantially one straight line which is parallel to the contour lines.

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: 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.

Abstract: An inkjet head system has an inkjet head and a printed board connected to the inkjet head. The inkjet head includes a cavity plate formed with a plurality of ink pressure chambers arranged adjacent to each other. A piezoelectric actuator is placed on the cavity plate. A plurality of driving electrodes is formed on the piezoelectric actuator at positions corresponding to respective ones of the plurality of ink pressure chambers. The printed board includes a plurality of electrode lands connected with respective ones of the plurality of driving electrodes to supply driving signals thereto. The electrode lands are connected with respective ones of the plurality of driving elements by means of magnetic force. Therefore, the printed board can be easily detached from the inkjet head by pulling it from the inkjet head against the magnetic force.

Abstract: An inkjet head has: a channel unit having a plurality of nozzles and a plurality of pressure chambers respectively communicating with the nozzles; and an actuator unit stuck onto the channel unit and having a piezoelectric sheet, a plurality of individual electrodes respectively arranged to positionally correspond to the pressure chambers respectively and a common electrode sandwiching the piezoelectric sheet together with the plurality of individual electrodes. The actuator unit has a thickness of 20 ?m to 100 ?m and a surface roughness of the end face of the actuator unit including an intersection with hannel unit and the actuator unit is 0.15 ?m to 0.5 ?m, and at least part of the end face is sealed by a resin film.

Abstract: An ink-jet head has a passage unit including a plurality of pressure chambers each having one end connected with a nozzle and another end connected with an ink supply source. Each of the pressure chambers is confined in each of a plurality of parallelogram regions and has an elliptical planar shape with no corner bulging in a direction to leave a line joining the one end and the another end in each of the pressure chambers, in a plane of the passage unit where the pressure chambers are arranged. The planar shape of the pressure chamber is slender along a longer diagonal line of a rhombic region, and a direction of the longer diagonal line of a rhombic region and a direction of a direction joining the one end and the other end in each of the pressure chambers are substantially coincident with each other.

Abstract: A method for correcting an amount of ejected ink in a line head inkjet printer, includes measuring an amount of ink ejected from each block including at least one nozzle, a plurality of nozzles formed in an inkjet head, the plurality of nozzles divided into the blocks; and obtaining a correction factor for each block on a basis of the measured amount of ejected ink in each block. The correction factors make a difference among the blocks in an amount of ejected ink per nozzle become small.

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 in a matrix adjacent to each other. The ink-jet head further includes an actuator unit attached to a surface of the passage unit for changing the volume of each of the pressure chambers. The actuator unit includes a piezoelectric sheet disposed to continuously extend over the pressure chambers, a common electrode disposed on one side of the piezoelectric sheet and kept at a constant potential, individual electrodes disposed on the other side of the piezoelectric sheet at positions corresponding to the respective pressure chambers, and recesses formed in regions of the piezoelectric sheet corresponding to portions between the pressure chambers.

Abstract: A line head inkjet printer includes an inkjet head, a storage unit, and a controller. The inkjet head includes a flow path unit and individual electrodes. The flow path unit is formed with pressure chambers communicating with nozzles. The individual electrodes correspond to the pressure chambers. The storage unit stores a table in which plural blocks, each of which includes at least one nozzle, are ranked in accordance with an amount of ejected ink per nozzle in each block. The controller generates plural kinds of waveforms, which are used to eject different amounts of ink from the nozzles. The controller selects a waveform for each block from the plurality kinds of waveforms on a basis of the table stored in the storage unit so that a difference among the blocks in the amount of ejected ink per nozzle becomes small. The controller outputs the selected waveforms to the individual electrodes.

Abstract: A line head inkjet printer includes an inkjet head, a controller and a storage unit. The controller generates n kinds of waveforms used to eject different amounts of ink from the nozzles (3?n (natural number)). The storage unit stores a combination of m kinds of waveforms selected from the n kinds of waveforms, for each block including at least one nozzle (2?m (natural number)?n?1). When the printer conducts gradation printing with using m kinds of waveforms selected from the n kinds of waveforms, a difference among the blocks in an amount of ejected ink per nozzle in a case of using the stored combinations of m kinds of waveforms for the respective blocks is smaller than that in a case of using one and the same combination of m kinds of waveforms for all the blocks.

Abstract: A method for making block of side-gussetted, bottom-weld bags. Each bag has an opening on one side to fascilitate the removal of individual bags from the block.