JP4206775B2 - Inkjet head - Google Patents

Inkjet head Download PDF

Info

Publication number
JP4206775B2
JP4206775B2 JP2003038779A JP2003038779A JP4206775B2 JP 4206775 B2 JP4206775 B2 JP 4206775B2 JP 2003038779 A JP2003038779 A JP 2003038779A JP 2003038779 A JP2003038779 A JP 2003038779A JP 4206775 B2 JP4206775 B2 JP 4206775B2
Authority
JP
Japan
Prior art keywords
unit
ink
actuator unit
flow path
support
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
JP2003038779A
Other languages
Japanese (ja)
Other versions
JP2003311953A (en
Inventor
淳 廣田
昭央 鈴木
Original Assignee
ブラザー工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2002-40559 priority Critical
Priority to JP2002040559 priority
Priority to JP2002-43592 priority
Priority to JP2002043592 priority
Application filed by ブラザー工業株式会社 filed Critical ブラザー工業株式会社
Priority to JP2003038779A priority patent/JP4206775B2/en
Publication of JP2003311953A publication Critical patent/JP2003311953A/en
Application granted granted Critical
Publication of JP4206775B2 publication Critical patent/JP4206775B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01Ink jet
    • B41J2/135Nozzles
    • B41J2/14Structure thereof only for on-demand ink jet heads
    • B41J2/14201Structure of print heads with piezoelectric elements
    • B41J2/14209Structure of print heads with piezoelectric elements of finger type, chamber walls consisting integrally of piezoelectric material
    • B41J2002/14217Multi layer finger type piezoelectric element
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01Ink jet
    • B41J2/135Nozzles
    • B41J2/14Structure thereof only for on-demand ink jet heads
    • B41J2/14201Structure of print heads with piezoelectric elements
    • B41J2/14209Structure of print heads with piezoelectric elements of finger type, chamber walls consisting integrally of piezoelectric material
    • B41J2002/14225Finger type piezoelectric element on only one side of the chamber
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01Ink jet
    • B41J2/135Nozzles
    • B41J2/14Structure thereof only for on-demand ink jet heads
    • B41J2/14201Structure of print heads with piezoelectric elements
    • B41J2002/14306Flow passage between manifold and chamber
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01Ink jet
    • B41J2/135Nozzles
    • B41J2/14Structure thereof only for on-demand ink jet heads
    • B41J2002/14459Matrix arrangement of the pressure chambers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01Ink jet
    • B41J2/135Nozzles
    • B41J2/14Structure thereof only for on-demand ink jet heads
    • B41J2002/14491Electrical connection
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41JTYPEWRITERS; SELECTIVE PRINTING MECHANISMS, e.g. INK-JET PRINTERS, THERMAL PRINTERS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01Embodiments of or processes related to ink-jet heads
    • B41J2202/20Modules

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to an inkjet head that performs printing by ejecting ink onto a printing medium.
[0002]
[Prior art]
  In an ink jet printer, an ink jet head distributes ink supplied from an ink tank to a manifold to a plurality of pressure chambers, and discharges ink from nozzles by selectively applying pulsed pressure to each pressure chamber. As one means for selectively applying pressure to the pressure chamber, an actuator unit in which a plurality of piezoelectric sheets made of ceramic are laminated may be used.
[0003]
  As an example of such an ink jet head, there is one having an actuator unit including a plurality of continuous flat plate-shaped piezoelectric sheets straddling a plurality of pressure chambers (see, for example, Patent Document 1). In this inkjet head, a common electrode that is common to a number of pressure chambers and held at a ground potential is provided between a plurality of piezoelectric sheets on which the actuator unit is stacked, and individual electrodes disposed at positions corresponding to the pressure chambers. Electrodes, ie drive electrodes, are arranged. Furthermore, surface electrodes connected to the common electrode and the individual electrodes are formed on the upper surface of the uppermost piezoelectric sheet. A flexible printed wiring board for electrically connecting the surface electrode and the power supply unit is disposed on the upper surface of the uppermost piezoelectric sheet. Therefore, when a voltage is applied between the common electrode and the individual electrode via the flexible printed wiring board and the surface electrode by the power supply unit, the piezoelectric sheet included in the actuator unit is distorted and ink is ejected. Is done. Note that in an inkjet printer including such an inkjet head, printing is generally performed while a sheet as a printing medium is sequentially conveyed from the leading end portion to a position facing the head.
[0004]
[Patent Document 1]
          Japanese Patent Laid-Open No. 2002-19102 (FIG. 1)
[0005]
[Problems to be solved by the invention]
  However, when a force is applied to the flexible printed wiring board disposed on the piezoelectric sheet on which the surface electrode is formed, the external printed circuit board is peeled off from the outside, and when the flexible printed wiring board is peeled off from the piezoelectric sheet, The electrical connection between the surface electrode and the power supply unit is cut off. As a result, it becomes impossible to apply a voltage between the common electrode and the individual electrode, so that ink cannot be ejected from the inkjet head.
[0006]
  It is an object of the present invention to improve the reliability of electrical connection between an actuator unit and a power supply unit.DoIs to provide.
[0007]
[Means for Solving the Problems]
  In order to achieve the above object, according to the first aspect of the present invention, a plurality of pressure chambers each having one end connected to a nozzle for ejecting ink and the other end connected to an ink supply source for supplying ink are arranged adjacent to each other along a plane. To change the volume of the pressure chamber and the pressure chamberAn individual electrode to which a drive signal is supplied and a common electrode to which a drive signal different from the drive signal supplied to the individual electrode is supplied;A head unit having an actuator unit disposed on the surface of the flow path unit;A conductive pattern electrically connected to the individual electrode and a conductive pattern electrically connected to the common electrode are formed,Electrically connected to the actuator unitFlexible cableAnd a support member for supporting the head unit across the actuator unit,Flexible cableBetween the support member and the head unitFlexible cableIt is characterized by being sandwiched between the support member and the flow path unit or the actuator unit at a distance from the connecting portion with the actuator unit in the direction in which the actuator is pulled out.
[0008]
  According to claim 1, the actuator unit is electrically connected.Flexible cableIs sandwiched between the support member and the flow path unit or actuator unit.Flexible cableEven if force is applied to the actuator unit to remove it from the actuator unit,Flexible cableIt is suppressed that a large force is directly applied to the connecting portion. Therefore,Flexible cableSince it is difficult to peel off from the actuator unit, the reliability of electrical connection between the actuator unit and the power supply unit can be improved.In addition, since the conductive pattern connected to the individual electrode and the common electrode is formed on the flexible cable, even when a force that peels the conductive pattern from the actuator unit from the outside is applied, Further, since the conductive pattern is further dispersed, the conductive pattern is further hardly peeled off from the actuator unit. Therefore, the reliability of the electrical connection between the actuator unit and the power supply unit can be further improved.
[0009]
  The ink jet head according to claim 2 is characterized in that:Flexible cableHowever, in the vicinity of the end portion of the flow path unit, the support member and the flow path unit or the actuator unit are sandwiched.
[0010]
  According to claim 2, from the outsideFlexible cableEven if force is applied to the actuator unit to remove it from the actuator unit,Flexible cableIt is further suppressed that a large force is directly applied to the connecting portion.
[0011]
  The ink jet head according to claim 3 is characterized in that:Flexible cableA sealing member is disposed in the sandwiching portion.
[0012]
  According to the third aspect, the conductive ink for some reason is externally connected to the actuator unit via the sandwiching portion.Flexible cableCan be prevented from entering the connecting portion.
[0013]
[0014]
[0015]
[0016]
[0017]
  According to a fourth aspect of the present invention, there is provided an ink jet head including a flow path unit in which a plurality of pressure chambers that communicate one end with a nozzle that ejects ink and the other end with an ink supply source that supplies ink are arranged adjacent to each other along a plane. In order to change the volume of the pressure chamberAn individual electrode to which a drive signal is supplied and a common electrode to which a drive signal different from the drive signal supplied to the individual electrode is supplied HaveA head unit having an actuator unit disposed on the surface of the flow path unit;A conductive pattern electrically connected to the individual electrode and a conductive pattern electrically connected to the common electrode are formed,Electrically connected to the actuator unitFlexible cableAnd a support member for supporting the head unit across the actuator unit, the support member, and a seal member disposed between the flow path unit or the actuator unit,Flexible cableBetween the support member and the head unitFlexible cableIs fixed by the seal member with respect to the support member and the flow path unit or the actuator unit at a distance from the connecting portion with the actuator unit in the direction in which the actuator is pulled out.
[0018]
  According to claim 4, the actuator unit is electrically connected.Flexible cableIs fixed to the support member and the flow path unit or the actuator unit by the seal member.Flexible cableEven if force is applied to the actuator unit to remove it from the actuator unit,Flexible cableIt is suppressed that a large force is directly applied to the connecting portion. Therefore,Flexible cableSince it is difficult to peel off from the actuator unit, the reliability of electrical connection between the actuator unit and the power supply unit can be improved. In addition, for some reason, conductive ink from the outside mayFlexible cableCan be prevented from entering the connecting portion. Therefore, it is possible to prevent an electrical short circuit between the connecting portions.In addition, since the conductive pattern connected to the individual electrode and the common electrode is formed on the flexible cable, even when a force that peels the conductive pattern from the actuator unit from the outside is applied, Further, since the conductive pattern is further dispersed, the conductive pattern is further hardly peeled off from the actuator unit. Therefore, the reliability of the electrical connection between the actuator unit and the power supply unit can be further improved.
[0019]
  In addition, the inkjet head according to claim 5Flexible cableIs fixed by the seal member in the vicinity of the end of the flow path unit.
[0020]
  According to claim 5, from the outsideFlexible cableEven if force is applied to the actuator unit to remove it from the actuator unit,Flexible cableIt is further suppressed that a large force is directly applied to the connecting portion.
[0021]
[0022]
[0023]
[0024]
[0025]
  Claims6The inkjet head is characterized in that the support member includes an ink supply member that supplies ink to the flow path unit.
[0026]
  Claim6Accordingly, even when the head is elongated with respect to the flow path unit that consumes ink, the ink can be stably supplied from the ink supply member included in the support member, so that the structure is simplified as a whole.
  Claims7The inkjet head is characterized in that a predetermined gap is formed between the support member and the actuator unit.
  Claim7According to the above, since the predetermined gap is formed between the support member and the actuator unit, the operation of the actuator unit is not hindered and the actuator unit is externally connected.Flexible cableIt is suppressed that force is directly applied to the connecting portion.
  Claims8The inkjet head of the aboveFlexible cableIs connected to the upper surface of the actuator unit, and the support member and theFlexible cableBetween the two, a predetermined gap is formed.
  Claims9In the inkjet head, the actuator unit is disposed on the pressure chamber side, the continuous flat plate-like insulating sheet as the inactive layer provided across the plurality of pressure chambers, and the pressure against the inactive layer A piezoelectric sheet as an active layer laminated on the opposite side of the chamber and polarized in the thickness direction, the active layer,SaidFormed corresponding to the common electrode and the pressure chamberSaidThe active layer is sandwiched between individual electrodes, and when the individual electrode is set to a potential different from that of the common electrode, the active layer contracts or expands in a direction perpendicular to the thickness direction due to a piezoelectric lateral effect. Uniform deformation due to the difference in strain between the non-active layer and the inactive layer is caused to change the volume of the pressure chamber.
  Claims10The inkjet head is characterized in that the support member and the actuator unit are arranged so as to contact each other.
  Claims11In the inkjet head, the flow path unit is a laminated body of a plurality of plate members including a nozzle plate in which a plurality of the nozzles are formed, and the nozzle plate has an end portion along a longitudinal direction of the nozzle plate. From the nozzle plate extending in the outer direction, the extending portion is bent toward the support member side, and a plurality of the extending portions are arranged along the longitudinal direction,Flexible cableIs arranged along the support member by the extending portion.
  Claims12In the inkjet head, the flow path unit is a laminated body of a plurality of plate members including a nozzle plate in which a plurality of the nozzles are formed, and the nozzle plate has an end portion along a longitudinal direction of the nozzle plate. The extending portion extends in the outer direction of the nozzle plate, and the extending portion is bent toward the support member and is disposed over the entire length of the nozzle plate in the longitudinal direction. The aboveFlexible cableIs arranged along the support member by the extending portion.
  Claim11, 12According to the above, the bent nozzle plate directly affects the impact force generated when the paper collides.Flexible cableNot communicated to. As a result, the actuator unitFlexible cableThe reliability of the electrical connection with can be further improved.
  Claims13The inkjet head of the aboveFlexible cableIs fixed by a seal member disposed between the support member and the extending portion.
  Claim13According to the actuator unitFlexible cablePreventing stress from being applied to the connectionFlexible cableCan be securely held.
[0027]
  Claims14In the inkjet head, a plurality of pressure chambers that communicate with one end to a nozzle that discharges ink and the other end to an ink supply member that supplies ink are arranged adjacent to each other along a plane, and a plurality of stacked plates are provided. In order to change the volume of the flow path unit and the pressure chamberAn individual electrode to which a drive signal is supplied and a common electrode to which a drive signal different from the drive signal supplied to the individual electrode is supplied;A head unit having an actuator unit disposed on the surface of the uppermost layer of the flow path unit so as to be separated from an end of the flow path unit;A conductive pattern electrically connected to the individual electrode and a conductive pattern electrically connected to the common electrode are formed,Electrically connected to the actuator unitWasA flexible cable, the ink supply member, a holder for fixing the ink supply member, a support member for supporting the head unit with the actuator unit interposed therebetween, and a portion near the end of the flow path unit And a seal member disposed between the holder and the holder, and the flexible cable is separated from the connection portion with the actuator unit in a direction in which the flexible cable is drawn from between the support member and the head unit. In addition, the seal member is fixed to the vicinity of the end of the flow path unit and the holder.
[0028]
  Claim14According to the actuator unit electrically connectedConductive patternSince the flexible cable formed with is fixed to the holder near the end of the flow path unit and the holder that is a part of the support member by a sealing member, the force that pulls the flexible cable from the actuator unit from the outside Even when is applied, it is possible to suppress a large force from being directly applied to the connecting portion between the actuator unit and the flexible cable. Therefore, since the flexible cable is difficult to peel off from the actuator unit, the reliability of the electrical connection between the actuator unit and the power supply unit can be improved. In addition, the holder that is a part of the support member can reduce the stress applied to the connecting portion between the actuator and the flexible cable (there is an attempt to peel them off) by bending the entire head. Further, it is possible to prevent the conductive ink from entering the connecting portion between the actuator unit and the flexible cable for some reason from the outside. Therefore, it is possible to prevent an electrical short circuit between the connecting portions. The above-described effects can be similarly obtained even in a long head in which a plurality of actuator units are stacked on a stacked flow path unit.
[0029]
  Claims15The inkjet head is characterized in that a predetermined gap is formed between the ink supply member and the actuator unit.
[0030]
  Claim15According to the above, since a predetermined gap is formed between the ink supply member and the actuator unit, the operation of the actuator unit is not hindered, and a force is directly applied to the connecting portion between the actuator unit and the flexible cable from the outside. Is suppressed.
[0031]
  Claims16In the inkjet head, the flow path unit includes a nozzle plate that is disposed in a lowermost layer of the flow path unit and in which a plurality of the nozzles are formed, and the nozzle plate is an end along the longitudinal direction of the nozzle plate. A projecting portion extending from the portion toward the outer side of the nozzle plate, wherein the projecting portion is bent toward the support member, and a plurality of the projecting portions are arranged along the longitudinal direction, and the flexible cable Is fixed by a seal member disposed between the support member and the projecting portion, and is disposed along the support member by the projecting portion. .
[0032]
  Claim16According to the above, the bent nozzle plate directly affects the impact force generated when the paper collides.Flexible cableNot communicated to. As a result, the actuator unitFlexible cableThe reliability of the electrical connection with can be further improved.
[0033]
[0034]
[0035]
[0036]
[0037]
[0038]
[0039]
[0040]
[0041]
[0042]
[0043]
[0044]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of an ink jet printer including an ink jet head according to an embodiment of the present invention. An ink jet printer 301 shown in FIG. 1 is a color ink jet printer having four ink jet heads 1. The printer 301 includes a paper feed unit 311 on the left side in the drawing and a paper discharge unit 312 on the right side in the drawing.
[0045]
  Inside the printer 301, a paper conveyance path that flows from the paper supply unit 311 toward the paper discharge unit 312 is formed. A pair of feed rollers 305 a and 305 b that sandwich and convey a sheet as an image recording medium are disposed immediately downstream of the sheet feed unit 311. A pair of feed rollers 305a and 305b feed the paper from the left to the right in the figure. Two belt rollers 306 and 307 and an endless transport belt 308 wound around the rollers 306 and 307 are disposed in the middle of the sheet transport path. The outer peripheral surface of the conveyor belt 308, i.e., the conveyor surface, is subjected to silicone treatment, while the sheet conveyed by the pair of feed rollers 305a and 305b is held on the conveyor surface of the conveyor belt 308 by its adhesive force, The belt roller 306 can be conveyed toward the downstream side (right side) by being rotated clockwise (in the direction of the arrow 304) in the drawing.
[0046]
  Holding members 309a and 309b are disposed at the insertion and discharge positions of the sheet with respect to the belt roller 306, respectively. The holding members 309a and 309b are for pressing the paper against the transport surface of the transport belt 308 and securely sticking the transport surface to the transport surface so that the paper on the transport belt 308 does not float from the transport surface.
[0047]
  A peeling mechanism 310 is provided immediately downstream of the conveying belt 308 along the sheet conveying path. The peeling mechanism 310 is configured to peel the paper adhered to the conveyance surface of the conveyance belt 308 from the conveyance surface and send it to the right paper discharge unit 312.
[0048]
  The four inkjet heads 1 have a head unit 70 at the lower end. The head units 70 each have a rectangular cross section, and are arranged close to each other so that the longitudinal direction thereof is a direction perpendicular to the paper transport direction (the direction perpendicular to the paper surface in FIG. 1). That is, the printer 301 is a line printer. The bottom surfaces of the four head units 70 are opposed to the paper transport path, and nozzles having a large number of ink discharge ports having a minute diameter are provided on these bottom surfaces. Magenta, yellow, cyan, and black inks are ejected from each of the four head units 70.
[0049]
  The head unit 70 is disposed so that a small amount of gap is formed between the lower surface of the head unit 70 and the conveyance surface of the conveyance belt 308, and a sheet conveyance path is formed in the gap portion. With this configuration, when the paper transported on the transport belt 308 sequentially passes immediately below the four head units 70, each color ink is ejected from the nozzle toward the upper surface of the paper, that is, the printing surface. A desired color image can be formed on the paper.
[0050]
  The inkjet printer 301 has a maintenance unit 317 for automatically performing maintenance on the inkjet head 1. The maintenance unit 317 is provided with four caps 316 for covering the lower surfaces of the four head units 70, a purge mechanism (not shown), and the like.
[0051]
  The maintenance unit 317 is located at a position (retracted position) immediately below the paper feed unit 311 when printing is performed by the inkjet printer 301. When a predetermined condition is satisfied after printing is completed (for example, when a state in which no printing operation is performed continues for a predetermined time or when the printer 301 is turned off), the four head units are used. The head unit 70 is moved to a position just below 70, and the lower surface of the head unit 70 is covered with the cap 316 at this position (cap position) to prevent ink from drying in the nozzle portion of the head unit 70. .
[0052]
  The belt rollers 306 and 307 and the conveyance belt 308 are supported by the chassis 313. The chassis 313 is placed on a cylindrical member 315 disposed below the chassis 313. The cylindrical member 315 is rotatable around a shaft 314 attached at a position off the center. Therefore, when the upper end height of the cylindrical member 315 changes with the rotation of the shaft 314, the chassis 313 moves up and down accordingly. When the maintenance unit 317 is moved from the retracted position to the cap position, the cylindrical member 315 is rotated in advance by an appropriate angle so that the chassis 313, the conveyance belt 308, and the belt rollers 306 and 307 are moved by an appropriate distance from the positions shown in FIG. It is necessary to secure the space for the maintenance unit 317 to move down.
[0053]
  In a region surrounded by the conveyance belt 308, a substantially rectangular parallelepiped shape (with the conveyance belt 308 and the conveyance belt 308 supporting the ink jet head 1 from the inner peripheral side by contacting the lower surface of the conveyance belt 308 on the upper side, that is, the position facing the inkjet head 1. A guide 318 having the same width is disposed.
[0054]
  Next, the structure of the inkjet head 1 according to the present embodiment will be described in more detail. FIG. 2 is an external perspective view of the inkjet head 1. 3 is a cross-sectional view taken along line III-III in FIG.
[0055]
  As shown in FIGS. 2 and 3, the inkjet head 1 according to the present embodiment supports a head unit 70 having a substantially rectangular planar shape extending in one direction (main scanning direction), and the head unit 70. Support member 71, a driver IC 80 for supplying a drive signal to the individual electrode 35a (see FIGS. 6 and 10), a substrate 81, and a heat sink 82.
[0056]
  The head unit 70 includes the flow path unit 4 and a plurality of actuator units 21 (both see FIGS. 4 and 7) bonded to the upper surface of the flow path unit 4, and ejects ink onto the paper. This is a substantially rectangular flat plate-shaped member. The detailed configuration of the head unit 70 will be described later.
[0057]
  As shown in FIG. 3, the support member 71 is partially bonded to the upper surface of the head unit 70 so as to support the head unit 70. The support member 71 is bonded to the upper surface of the base block 75. And a holder 72 for holding 75. The base block 75 has a function as an ink supply source or an ink supply member for supplying ink to the head unit 70. The holder 72 includes a holder main body 73 disposed on the head unit 70 side, and a pair of holder support portions 74 extending from the holder main body 73 to the side opposite to the head unit 70.
[0058]
  The holder body 73 is a flat plate member having substantially the same shape as the head unit 70, and has both ends in the sub-scanning direction (the direction in which the paper moves relative to the inkjet head 1 and is orthogonal to the main scanning direction). The part is provided with a pair of projecting parts 73a that extend in the longitudinal direction and project downward. Here, since each of the pair of protrusions 73a is formed over the entire width in the longitudinal direction of the holder main body 73, a substantially rectangular parallelepiped groove 73b sandwiched between the pair of protrusions 73a is formed on the lower surface of the holder main body 73. Is formed. Each of the pair of holder support portions 74 is a plate-like member, and is provided in parallel to each other with a predetermined interval along the longitudinal direction of the holder main body 73.
[0059]
  The base block 75 is a substantially rectangular parallelepiped member having substantially the same length as the length in the longitudinal direction of the head unit 70, and has a flow path for ink supplied to the head unit 70. Further, the base block 75 is disposed so as to be housed in the groove 73 b of the holder main body 73. Here, the upper surface of the base block 75 and the bottom surface of the groove portion 73b of the holder main body 73 are bonded with an adhesive. Since the thickness of the base block 75 is slightly larger than the depth of the groove 73 b of the holder main body 73, the lower end of the base block 75 protrudes downward from the groove 73 b of the holder main body 73.
[0060]
  Inside the base block 75, there are two ink reservoirs 3 (see FIG. 4), which are two substantially rectangular parallelepiped voids (hollow regions) extending in the longitudinal direction as flow paths for the ink supplied to the head unit 70. Is provided. The two ink reservoirs 3 are provided in parallel to each other at a predetermined interval along the longitudinal direction of the base block 75. That is, the two ink reservoirs 3 are divided into two by a partition wall 75a arranged in the vicinity of the axial center position of the base block 75 along the longitudinal direction of a substantially rectangular space formed inside the base block 75. Is formed. In addition, an opening 3b is formed on the lower surface 76 of the base block 75 at a position corresponding to one of the ink reservoirs 3 (on the left side in FIG. 3).
[0061]
  Here, the partition wall 75a that divides the interior of the base block 75 into two may be arranged along the longitudinal direction so as to completely divide the interior into two, or an ink reservoir formed on both sides of the partition wall 75a. 3 may be partially arranged along the longitudinal direction so as to communicate with each other. Alternatively, in order to supply ink to the head unit 70, the partition 75 a may be arranged so as to extend in the sub-scanning direction inside the base block 75 as long as it does not prevent the opening 3 b serving as an ink supply port from being opened. Also in this case, the partition 75a may be disposed so that the ink reservoir 3 formed by the partition 75a is isolated, or the ink reservoir 3 may be disposed so as to communicate with each other. Further, a plurality of the partition walls 75a may be arranged. In any case, the base block 75 having a gap inside serves as a kind of rigid member constituting the ink jet head 1 by the partition wall 75a disposed therein, and can be applied even if the ink jet head 1 is long. Can be prevented from being bent by an external force.
[0062]
  The lower surface 76 of the base block 75 protrudes below the periphery in the vicinity of the opening 3b. The base block 75 is in contact with the flow path unit 4 (see FIG. 3) of the head unit 70 only in the portion 76a in the vicinity of the opening 3b of the lower surface 76. Therefore, a region other than the portion 76a in the vicinity of the opening 3b on the lower surface 76 of the base block 75 is separated from the head unit 70, and the actuator unit 21 is disposed in this separated portion.
[0063]
  Thus, in the present embodiment, the base block 75 included in the support member 71 has a substantially rectangular cross section, and has a hollow structure (structure having a gap extending in the longitudinal direction) at the center. Yes. Therefore, the base block 75 made of a metal material such as stainless steel has a function as a lightweight structure that reinforces the support member 71 (inkjet head 1). Further, the base block 75 has a partition wall 75a that divides a gap formed therein into two along the longitudinal direction. Therefore, the strength of the support member 71 is also improved by providing the partition wall 75 a in the base block 75.
[0064]
  A driver IC 80 is attached to a side surface on the outer side in the sub-scanning direction in the vicinity of the root portion of the pair of holder support portions 74 of the holder 72 via a flat elastic member 83 formed of sponge or the like. A flexible printed wiring board (FPC) 50 that is a power supply member is connected to the driver IC 80. The FPC 50 is arranged so as to pass between the elastic member 83 and the driver IC 80. A heat sink 82 is disposed outside the driver IC 80 so as to be in close contact with the outer surface thereof. The heat sink 82 is a substantially rectangular parallelepiped member for releasing heat generated in the driver IC 80. The elastic member 83 presses the driver IC 80, which generates heat during driving, against the heat sink 82 for heat dissipation via the FPC 50, thereby realizing good heat dissipation.
[0065]
  A substrate 81 is provided above the driver IC 80 and the heat sink 82 and outside the FPC 50. The FPC 50 connected to the driver IC 80 is electrically joined to the substrate 81 and the head unit 70 by soldering. Here, the vicinity of the upper end portion of the heat sink 82 and the substrate 81 and the vicinity of the lower end portion of the heat sink 82 and the FPC 50 are respectively bonded by the seal members 84.
[0066]
  FIG. 4 is a schematic plan view of the head unit 70. Here, as shown in FIG. 4, the head unit 70 includes the flow path unit 4 in which a large number of pressure chambers 10 and ink discharge ports 8 (both see FIGS. 5 to 7) to be described later are formed. A plurality of trapezoidal actuator units 21 arranged in two rows in a staggered pattern are bonded to the upper surface. FIG. 4 is a view of the head unit 70 as viewed from the support member 71 side. More specifically, each actuator unit 21 is arranged such that its parallel opposing sides (upper side and lower side) are along the longitudinal direction of the flow path unit 4. Further, the oblique sides of the adjacent actuator units 21 overlap in the width direction of the flow path unit 4. In FIG. 4, the actuator unit 21 is arranged between the flow path unit 4 and a base block 75 to be described later, and should not be seen by the base block 75, but is shown by a solid line for convenience. is there.
[0067]
  The lower surface of the flow path unit 4 corresponding to the adhesion area of the actuator unit 21 is an ink ejection area. On the surface of the ink discharge region, as will be described later, a large number of ink discharge ports 8 are arranged in a matrix. Further, a base block 75 in which the ink reservoir 3 is formed is disposed above the flow path unit 4 along the longitudinal direction of the inside thereof. The ink reservoir 3 communicates with an ink tank (not shown) through an opening 3a provided on the upper surface (on the holder main body 73 side) of the base block 75, and is always filled with ink. As described above, the ink reservoir 3 has two openings 3b in pairs along the extending direction, and is provided in a staggered manner in a region where the actuator unit 21 is not provided.
[0068]
  FIG. 5 is an enlarged view of a region surrounded by a one-dot chain line drawn in FIG. As shown in FIGS. 4 and 5, the ink reservoir 3 includes an opening 3 b formed corresponding to the ink reservoir 3 and an opening 3 b ′ formed on the flow path unit 4 side corresponding to the opening 3 b. Via the manifold 5 in the flow path unit 4. A filter (not shown) for capturing dust or the like contained in the ink may be provided in the opening 3b 'on the flow path unit 4 side. The manifold 5 has a sub-manifold 5a with its tip portion branched into two. Two sub-manifolds 5 a enter the lower part of one actuator unit 21 from two openings 3 b ′ adjacent to the actuator unit 21 in the longitudinal direction of the inkjet head 1. That is, a total of four sub-manifolds 5 a extend along the longitudinal direction of the inkjet head 1 at the bottom of one actuator unit 21. Each sub-manifold 5a is filled with ink supplied from the ink reservoir 3 through the opening 3b on the base block 75 side and the opening 3b 'on the flow path unit 4 side.
[0069]
  Here, as described above, the ink in the ink reservoir 3 is supplied to the flow path unit 4 from the plurality of openings 3 b ′ provided uniformly along the longitudinal direction of the flow path unit 4. As shown in FIG. 4, each opening 3 a is arranged so as to correspond to each actuator unit 21 arranged on the flow path unit 4. Therefore, even when the head is elongated, ink is stably supplied to the flow path unit 4.
[0070]
  FIG. 6 is an enlarged view of a region surrounded by a one-dot chain line drawn in FIG. As shown in FIGS. 5 and 6, individual electrodes 35 a having a substantially rhombic planar shape are regularly arranged in a matrix on the upper surface of the actuator unit 21. An individual electrode 35b having the same shape as the individual electrode 35a is disposed at a position overlapping the individual electrode 35a in the vertical direction. In addition, a large number of ink discharge ports 8 are regularly arranged in a matrix on the surface of the ink discharge region corresponding to the actuator unit 21 of the flow path unit 4. In the flow path unit 4, a substantially rhombic pressure chamber (cavity) 10, which is in communication with each ink discharge port 8 and whose planar shape is slightly larger than the individual electrodes 35 a and 35 b, and the apertures 12 are respectively arranged in a matrix. Arranged regularly. The pressure chamber 10 is formed at a position corresponding to the individual electrodes 35 a and 35 b, and most of the individual electrodes 35 a and 35 b are included in the region of the pressure chamber 10 in plan view. 5 and 6, the pressure chambers 10 and the apertures 12 and the like that are to be drawn with broken lines in the actuator unit 21 or the flow path unit 4 are drawn with solid lines for easy understanding of the drawings. Further, in FIG. 6, for convenience, connection pads 55 and 60 provided on the FPC 50 side attached to the upper surface of the actuator unit 21 are drawn.
[0071]
  As shown in FIGS. 5 and 6, a large number of grounding electrodes 38 each having a circular shape are formed in the vicinity of the outer edge of the upper surface of the actuator unit 21. A large number of grounding electrodes 38 are spaced so that adjacent ones are substantially equally spaced. Therefore, the region where the individual electrode 35a on the upper surface of the actuator unit 21 is formed is surrounded by a large number of grounding electrodes 38 over the entire circumference.
[0072]
  FIG. 7 is a partial cross-sectional view of the head unit depicted in FIG. 2 and the FPC 50 attached thereto. Each ink discharge port 8 is formed at the tip of a tapered nozzle, as can be seen from FIG. Each ink discharge port 8 communicates with the sub-manifold 5a via the pressure chamber 10 (length 900 μm, width 350 μm) and the aperture 12. In this manner, the ink jet head 1 is formed with the ink flow path 32 from the ink tank to the ink discharge port 8 through the ink reservoir 3, the manifold 5, the sub manifold 5a, the aperture 12, and the pressure chamber 10.
[0073]
  Further, as is apparent from FIG. 7, the pressure chamber 10 and the aperture 12 are provided at different heights. As a result, as shown in FIG. 6, in the flow path unit 4 corresponding to the ink discharge area below the actuator unit 21, the aperture 12 communicating with one pressure chamber 10 is moved to a pressure chamber adjacent to the pressure chamber. 10 and the same position in plan view. As a result, the pressure chambers 10 are in close contact with each other and are arranged at high density, so that high-resolution image printing is realized by the inkjet head 1 having a relatively small occupation area.
[0074]
  The pressure chamber 10 includes a longitudinal direction (first arrangement direction) of the inkjet head 1 and a direction slightly inclined from the width direction of the inkjet head 1 (second arrangement direction) in the plane depicted in FIGS. 5 and 6. Are arranged in the ink discharge area in the two directions. The first arrangement direction and the second arrangement direction form an angle θ slightly smaller than a right angle. The ink discharge ports 8 are arranged at 50 dpi in the first arrangement direction. On the other hand, the pressure chambers 10 are arranged so that twelve pressure chambers 10 are included in the ink ejection region corresponding to one actuator unit 21 in the second arrangement direction. As a result, within the entire width of the inkjet head 1, twelve ink ejection ports 8 exist in a range separated by a distance between two ink ejection ports 8 adjacent in the first arrangement direction. It should be noted that at both ends (corresponding to the oblique sides of the actuator unit 21) of each ink discharge region in the first arrangement direction, a complementary relationship with an ink discharge region corresponding to another actuator unit 21 facing the width direction of the inkjet head 1 is provided. Therefore, the above condition is satisfied. Therefore, in the inkjet head 1 according to the present embodiment, the ink is sequentially ejected from the large number of ink ejection ports 8 arranged in the first and second arrangement directions as the inkjet head 1 moves relative to the paper in the width direction. By ejecting the droplets, it is possible to perform printing at 600 dpi in the main scanning direction.
[0075]
  Next, the structure of the flow path unit 4 will be described in more detail with reference to FIG. FIG. 8 is a schematic diagram showing the positional relationship between the three components of the pressure chamber 10, the ink discharge port 8, and the aperture (restricted flow path) 12. As shown in FIG. 8, the pressure chambers 10 are arranged in a row at a predetermined interval of 50 dpi in the first arrangement direction. Such rows of pressure chambers 10 are arranged in 12 rows in the second arrangement direction, and as a whole, the pressure chambers 10 are two-dimensionally arranged in the ink discharge region corresponding to one actuator unit 21.
[0076]
  There are two types of pressure chambers 10, a pressure chamber 10 a having a nozzle connected to the upper acute angle portion in FIG. 8 and a pressure chamber 10 b connected to the lower acute angle portion in FIG. 8. The plurality of pressure chambers 10a and the plurality of pressure chambers 11b are both arranged in the first arrangement direction to form pressure chamber rows 11a and 11b, respectively. As shown in FIG. 8, in the ink ejection region corresponding to one actuator unit 21, two rows of pressure chambers 11a are arranged in order from the lower side in FIG. 8, and two rows of pressure are adjacent to the upper side. The chamber row 11b is arranged. A combination of such two pressure chamber rows 11a and two pressure chamber rows 11b and four pressure chamber rows as one set is an ink discharge corresponding to one actuator unit 21. Within the region, the sequence is repeated three times from the bottom. A straight line connecting the upper acute angle portions of the pressure chambers in the pressure chamber rows 11a and 11b intersects the lower oblique side of each pressure chamber in the pressure chamber row adjacent to the pressure chamber row from above.
[0077]
  As described above, the first pressure chamber row 11a and the second pressure chamber row 11b having different arrangement positions of the nozzles connected to the pressure chamber 10 as viewed from the direction perpendicular to the paper surface of FIG. By arranging the columns adjacent to each other, the pressure chambers 10 are regularly aligned as a whole. On the other hand, the nozzles are gathered and arranged in the central region in a set of pressure chamber rows in which the four pressure chamber rows are one set. Thus, as described above, when the four pressure chamber rows are set as one set and the pressure chamber row set is repeated three times from the lower side, the region near the boundary between the pressure chamber row set and the set, that is, Regions where no nozzles are present are formed on both sides of such a set of four pressure chamber rows. A wide sub-manifold 5a for supplying ink to each pressure chamber 10 is extended there. In the present embodiment, in the ink ejection region corresponding to one actuator unit 21, one is located on the lower side in the figure, and between the lowermost pressure chamber row group and the second pressure chamber row group. And four wide sub-manifolds 5a extending in the first arrangement direction, two on each side of the uppermost pressure chamber row group.
[0078]
  As shown in FIG. 8, the nozzles communicating with the ink discharge ports 8 for discharging ink are arranged at equal intervals of 50 dpi in the first arrangement direction corresponding to the pressure chambers 10 regularly arranged in this direction. . Further, unlike the twelve pressure chambers 10 arranged in the second arrangement direction intersecting the first arrangement direction at an angle θ, twelve pressure chambers 10 corresponding to these twelve pressure chambers 10 are arranged. As described above, there are nozzles that communicate with the upper acute angle part of the pressure chamber 10 and nozzles that communicate with the lower acute angle part, and the nozzles are not regularly arranged at regular intervals in the second arrangement direction. .
[0079]
  On the other hand, when the nozzles are always in communication with the acute angle portion on the same side of the pressure chamber 10, the nozzles are also regularly arranged at regular intervals in the direction of the second arrangement direction. That is, in this case, the nozzles are arranged so as to be displaced by an interval corresponding to 600 dpi, which is the resolution at the time of printing, in the first arrangement direction every time one pressure chamber row rises from the lower side to the upper side in the drawing. On the other hand, in the present embodiment, two pressure chamber rows 11a and two pressure chamber rows 11b are combined into a set of four pressure chamber rows, and this is repeated three times from the lower side. Therefore, the displacement of the nozzle positions in the first arrangement direction every time one pressure chamber line rises from the lower side to the upper side in the figure is not always the same.
[0080]
  In the inkjet head 1, a strip-like region R having a width corresponding to 50 dpi (about 508.0 μm) in the first arrangement direction and extending in a direction orthogonal to the first arrangement direction will be considered. In the belt-like region R, there is only one nozzle for any of the twelve pressure chamber rows. That is, when such a belt-like region R is partitioned at an arbitrary position in the ink discharge region corresponding to one actuator unit 21, twelve nozzles are always distributed in the belt-like region R. The positions of the points where these 12 nozzles are projected on a straight line extending in the first arrangement direction are separated by an interval corresponding to 600 dpi, which is the resolution at the time of printing.
[0081]
  The twelve nozzles belonging to one band-shaped region R are denoted by (1) to (12) in order from the left of the projected position on a straight line extending in the first arrangement direction. These 12 nozzles are (1), (7), (2), (8), (5), (11), (6), (12), (9), ( They are arranged in the order of 3), (10), (4).
[0082]
  In the inkjet head 1 according to the present embodiment configured as described above, when the active layer in the actuator unit 21 is appropriately driven, characters, figures, and the like having a resolution of 600 dpi can be drawn. That is, specific characters and figures can be printed on the print medium by selectively driving the active layers corresponding to the 12 pressure chamber rows sequentially in accordance with the conveyance of the print medium.
[0083]
  For example, a case where a straight line extending in the first arrangement direction is printed with a resolution of 600 dpi will be described. First, the case where the nozzle communicates with the acute angle portion on the same side of the pressure chamber 10 will be briefly described. In this case, in response to the printing butterfly being transported, ink discharge is started from the nozzles in the pressure chamber row located at the bottom in FIG. 8, and sequentially belongs to the pressure chamber row adjacent to the upper side. Select a nozzle to eject ink. As a result, ink dots are formed adjacent to each other at an interval of 600 dpi in the first arrangement direction. Finally, a straight line extending in the first arrangement direction is drawn with a resolution of 600 dpi as a whole.
[0084]
  On the other hand, in the present embodiment, ink discharge starts from the nozzles in the pressure chamber row 11a located at the bottom in FIG. 8, and sequentially communicates with the pressure chambers adjacent to the upper side as the print medium is conveyed. The nozzle to be selected is selected and ink is ejected. At this time, since the displacement of the nozzle positions in the first arrangement direction is not always the same every time one pressure chamber line rises from the lower side to the upper side, it is sequentially formed along the first arrangement direction as the print medium is conveyed. The dots of ink that are used are not evenly spaced at an interval of 600 dpi.
[0085]
  That is, as shown in FIG. 8, in response to the printing medium being transported, first, ink is ejected from the nozzle (1) communicating with the lowermost pressure chamber row 11a in the figure, and onto the printing medium. Dot rows are formed at intervals corresponding to 50 dpi (about 508.0 μm). Thereafter, when the straight line formation position reaches the position of the nozzle (7) communicating with the second pressure chamber row 11a from the bottom along with the conveyance of the printing medium, ink is ejected from the nozzle (7). As a result, 2 is moved to the position (about 42.3 μm × 6 = about 254.0 μm) displaced in the first arrangement direction by 6 times the interval corresponding to 600 dpi (about 42.3 μm) from the initially formed dot position. A second ink dot is formed.
[0086]
  Next, when the straight line formation position reaches the position of the nozzle (2) communicating with the third pressure chamber row 11b from the bottom along with the conveyance of the print medium, ink is ejected from the nozzle (2). As a result, a third ink dot is formed at a position displaced from the initially formed dot position by an interval corresponding to 600 dpi (about 42.3 μm) in the first arrangement direction. Further, as the printing medium is conveyed, when the straight line formation position reaches the position of the nozzle (8) communicating with the fourth pressure chamber row 11b from the bottom, ink is ejected from the nozzle (8). As a result, a position (about 42.3 μm × 7 = about 296.3 μm) displaced in the first arrangement direction by 7 times the interval corresponding to 600 dpi (about 42.3 μm) from the position of the first formed dot. A fourth ink dot is formed. Further, when the printing medium is conveyed and the straight line formation position reaches the position of the nozzle (5) communicating with the fifth pressure chamber row 11a from the bottom, ink is ejected from the nozzle (5). As a result, 5 is shifted from the initially formed dot position to a position (about 42.3 μm × 5 = about 169.3 μm) displaced in the first arrangement direction by 4 times the interval corresponding to 600 dpi (about 42.3 μm). A second ink dot is formed.
[0087]
  In the same manner, ink dots are sequentially formed while selecting nozzles communicating with the pressure chambers 10 positioned from the lower side to the upper side in the drawing. At this time, if the number of the nozzle shown in FIG. 8 is N, the first arrangement from the dot positions formed first by an amount corresponding to (magnification n = N−1) × (interval corresponding to 600 dpi). Ink dots are formed at positions displaced in the direction. When 12 nozzles have been finally selected, between the ink dots formed at an interval (about 508.0 μm) corresponding to 50 dpi by the nozzle (1) in the lowermost pressure chamber row 11a in the figure. Are connected by twelve dots formed at intervals corresponding to 600 dpi (approximately 42.3 μm), and it is possible to draw a straight line extending in the first arrangement direction with a resolution of 600 dpi as a whole.
[0088]
  Next, the cross-sectional structure of the head unit 70 according to the present embodiment will be described. FIG. 9 is a partially exploded perspective view of the head unit depicted in FIG. 2 and the FPC 50 attached thereto. As shown in FIGS. 7 and 9, the main part on the bottom side of the inkjet head 1 is the FPC 50, actuator unit 21, cavity plate 22, base plate 23, aperture plate 24, supply plate 25, manifold plates 26, 27 from the top. 28, the cover plate 29 and the nozzle plate 30, a total of 11 sheet materials are laminated. Among these, the flow path unit 4 is composed of nine plates excluding the FPC 50 and the actuator unit 21.
[0089]
  As will be described in detail later, the actuator unit 21 is formed by stacking five piezoelectric sheets and arranging electrodes so that three of them are layers (hereinafter simply referred to as active layers when an electric field is applied). The remaining two layers are non-active layers. The cavity plate 22 is a metal plate provided with a number of substantially diamond-shaped openings corresponding to the pressure chambers 10. The base plate 23 is a metal plate provided with a communication hole between the pressure chamber 10 and the aperture 12 and a communication hole from the pressure chamber 10 to the ink discharge port 8 with respect to one pressure chamber 10 of the cavity plate 22. The aperture plate 24 is a metal plate provided with a communication hole from the pressure chamber 10 to the ink discharge port 8 in addition to the aperture 12 for one pressure chamber 10 of the cavity plate 22. The supply plate 25 is a metal plate provided with a communication hole between the aperture 12 and the sub-manifold 5a and a communication hole from the pressure chamber 10 to the ink discharge port 8 with respect to one pressure chamber 10 of the cavity plate 22. The manifold plates 26, 27, and 28 are metal plates each provided with a communication hole from the pressure chamber 10 to the ink discharge port 8 for one pressure chamber 10 of the cavity plate 22 in addition to the sub-manifold 5 a. The cover plate 29 is a metal plate in which a communication hole from the pressure chamber 10 to the ink discharge port 8 is provided for one pressure chamber 10 of the cavity plate 22. The nozzle plate 30 is a metal plate provided with a tapered ink discharge port 8 that functions as a nozzle for each pressure chamber 10 of the cavity plate 22.
[0090]
  As a result, the pressure chamber 10 has a base plate 23 in which one opening surface of the opening forming the pressure chamber 10 of the cavity plate 22 is closed by the lower surface of the actuator unit 21 and the other opening surface is located below the cavity plate 22. It is formed by being blocked by the upper surface. The sub-manifold 5 a that supplies ink to each pressure chamber 10 has an upper opening surface of the manifold plate 26 that forms the sub-manifold 5 a closed by the lower surface of the supply plate 25, so that the sub-manifold 5 a of the manifold plate 28 is blocked. It is formed by closing the lower opening surface of the opening to be formed by the upper surface of the cover plate 29.
[0091]
  These ten sheets 21 to 30 are stacked in alignment with each other so that an ink flow path 32 as shown in FIG. 7 is formed. The ink flow path 32 first extends upward from the sub-manifold 5a, extends horizontally at the aperture 12, then further upwards, extends horizontally again at the pressure chamber 10, and then moves away from the aperture 12 for a while. It goes from the diagonally downward direction to the ink discharge port 8 vertically downward. Note that the FPC 50 is stacked in alignment with the electrodes arranged in the actuator unit 21.
[0092]
  Next, the structure of the actuator unit 21 and the connection between the actuator unit 21 and the FPC 50 will be described. FIG. 10A is a cross-sectional view of the actuator unit to which the FPC 50 is attached, taken along the line XA-XA drawn in FIG. 6, and is an area surrounded by a one-dot chain line drawn in FIG. 7. FIG. FIG. 10B is a cross-sectional view of the actuator unit to which the FPC 50 is attached along the line XB-XB drawn in FIG. FIG. 10C is an enlarged view inside a round frame drawn by a one-dot chain line in FIG. FIG. 10D is an enlarged view in a round frame drawn by a one-dot chain line in FIG.
[0093]
  As shown in FIGS. 10A and 10B, the actuator unit 21 includes five piezoelectric sheets 41, 42, 43, 44, and 45 that are formed to have the same thickness of about 15 μm. Contains. These piezoelectric sheets 41 to 45 are continuous layered flat plates (continuous flat plate layers) so as to be disposed across a number of pressure chambers 10 formed in one ink discharge region in the inkjet head 1. . Since the piezoelectric sheets 41 to 45 are arranged as a continuous flat plate layer across a large number of pressure chambers 10, the individual electrodes 35a and 35b can be arranged at high density by using, for example, a screen printing technique. Yes. For this reason, the pressure chambers 10 formed at positions corresponding to the individual electrodes 35a and 35b can be arranged with high density, and high-resolution images can be printed. In the present embodiment, the piezoelectric sheets 41 to 45 are made of a lead zirconate titanate (PZT) ceramic material having ferroelectricity. 7 and 10 (a), the FPC 50 and the piezoelectric sheet 41 are drawn so as to be bonded to each other, but in actuality, both of them are the main electrode portions 90 of the individual electrodes 35a. It is not glued. This is to prevent the FPC 50 attached to the main electrode portion 90 from inhibiting the deformation of the actuator unit 21 and the pressure chamber 10.
[0094]
  As shown in FIG. 10 (a), the piezoelectric sheet 41 between the positions corresponding to one end of the main electrode 90 (the end opposite to the auxiliary electrode 91) of the individual electrode 35a and the individual electrode 35b, Through holes 41 a and 42 a are formed in 42. As shown in FIG. 10C, the through holes 41a and 42a are filled with a conductive material (silver palladium or the like) 48, and the individual electrode 35a and the individual electrode 35b are connected to each pressure via the conductive material 48. The ones corresponding to the chambers 10 are connected to each other.
[0095]
  As shown in FIG. 10 (b), through holes 41 b, 42 b, 43 b that penetrate the piezoelectric sheets 41, 42, 43 are formed below the ground electrode 38. The through holes 41b, 42b, and 43b are filled with a conductive material (silver palladium or the like) 49 as shown in FIG. 10 (d), and the ground electrode 38 is connected to the common electrode 34a and the conductive material 49 through the conductive material 49. It is connected to the common electrode 34b.
[0096]
  A common electrode 34a having a thickness of about 2 μm is interposed between the piezoelectric sheet 41 in the uppermost layer of the actuator unit 21 and the piezoelectric sheet 42 adjacent thereto below. The common electrode 34 a is a single conductive sheet that extends over almost the entire area in one actuator unit 21. Similarly, a common electrode 34b having a shape similar to the common electrode 34a and having a thickness of about 2 μm is interposed between the piezoelectric sheet 43 adjacent below the piezoelectric sheet 42 and the piezoelectric sheet 44 adjacent below the piezoelectric sheet 43. .
[0097]
  The common electrodes 34a and 34b may be formed in large numbers for each pressure chamber 10 so that the projected region in the stacking direction includes the pressure chamber region, or the projected region may be a pressure region. A large number of those that are slightly smaller than the pressure chamber 10 may be formed for each pressure chamber 10 so as to be included in the chamber region, and it is not always necessary to be one conductive sheet formed on the entire surface of the sheet. However, at this time, it is necessary that the common electrodes are electrically connected so that the portions corresponding to the pressure chambers 10 all have the same potential.
[0098]
  As shown in FIG. 10A, an individual electrode 35 a having a thickness of about 1 μm is formed on the upper surface of the piezoelectric sheet 41 and at a position corresponding to the pressure chamber 10. The individual electrode 35a has a substantially rhombus shape in plan view and a shape similar to that of the pressure chamber 10 (length: 850 μm, width: 250 μm) (see FIGS. 6 and 11).
[0099]
  FIG. 11 is a schematic partially enlarged plan view of FIG. The individual electrode 35a includes a main electrode portion 90 having a substantially rhombus shape in plan view, and a substantially rhombic auxiliary electrode portion 91 that is smaller than the main electrode portion 90 and continuously formed from one acute angle portion thereof. Yes. The main electrode unit 90 includes a projection region in the stacking direction in a pressure chamber region (a region surrounded by a broken line in FIG. 11). On the other hand, most of the auxiliary electrode portion 91 does not include the projection region in the stacking direction in the pressure chamber region.
[0100]
  As apparent from FIG. 11, in the individual electrode 35a, the width of the connecting portion 92 between the main electrode portion 90 and the auxiliary electrode portion 91 (the length in the direction orthogonal to the direction connecting the main electrode portion 90 and the auxiliary electrode portion 91). ) Is smaller than the width of the main electrode portion 90 and the width of the auxiliary electrode portion 91. That is, in the individual electrode 35a, the connecting portion 92 between the main electrode portion 90 and the auxiliary electrode portion 91 has a constricted shape.
[0101]
  Further, between the piezoelectric sheet 42 and the piezoelectric sheet 43, an individual electrode 35b having a thickness of about 2 μm formed in the same manner as the individual electrode 35a is interposed. On the other hand, no electrode is disposed between the piezoelectric sheet 44 adjacent below the piezoelectric sheet 43 and the piezoelectric sheet 45 adjacent below the piezoelectric sheet 43 and below the piezoelectric sheet 45. In the present embodiment, the electrodes 34a, 34b, 35a, 35b are made of a metal material such as an Ag—Pd system.
[0102]
  The FPC 50 is a member for connecting the individual electrodes 35a and 35b and the common electrodes 34a and 34b of the actuator unit 21 to the driver IC 80, and as shown in FIGS. 10 (a) and 10 (b), The lower surface includes connection pads 55 and 60 that are electrically joined to the individual electrode 35a and the grounding electrode 38 disposed on the upper surface of the actuator unit 21 by soldering.
[0103]
  The FPC 50 includes a base film 51, conductor portions 53 and 54 provided on the lower surface of the base film 51, and a cover film 52 provided so as to cover the conductor portions 53 and 54 over almost the entire surface of the base film 51. ing. The FPC 50 is arranged so that the cover film 52 is in contact with the upper surface of the piezoelectric sheet 41 in the uppermost layer of the actuator unit 21, as shown in FIGS. 10 (a) and 10 (b). The base film 51 and the cover film 52 are both sheet-like members having insulating properties.
[0104]
  Here, as shown in FIG. 10A, a conductive connection pad 55 is provided on the lower surface of the base film 51 at a position corresponding to one end of the individual electrode 35a. That is, the connection pad 55 is provided at a position corresponding to the auxiliary electrode portion 91 of the individual electrode 35a. Therefore, one connection pad 55 is provided for each individual electrode 35a.
[0105]
  Further, as shown in FIG. 10B, a conductive connection pad 60 is provided on the lower surface of the base film 51 at a position corresponding to the grounding electrode 38 formed in the vicinity of the outer edge of the upper surface of the actuator unit 21. Is provided.
[0106]
  And in the position corresponding to the connection pad 55 and the connection pad 60 of the cover film 52, as shown to Fig.10 (a) and FIG.10 (b), a diameter slightly larger than the diameter of the connection pad 55 and the connection pad 60 is shown. Through-holes 52a and 52b are formed. Accordingly, most of the lower surface of the base film 51 except the connection pads 55 and the connection pads 60 at positions corresponding to the through holes 52 a and 52 b are covered with the cover film 52.
[0107]
  Moreover, the conductor parts 53 and 54 arrange | positioned between the base film 51 and the cover film 52 are formed with the copper foil. Here, the conductor portion 53 is a wiring for connecting the connection pad 55 and the driver IC 80. On the other hand, the conductor portion 54 is a wiring for grounding the connection pad 60. Therefore, the conductor parts 53 and 54 are provided on the lower surface of the base film 51 so as to form a predetermined pattern.
[0108]
  As described above, when the FPC 50 having the connection pads 55 and 60 is disposed on the upper surface of the piezoelectric sheet 41 on which the individual electrode 35a and the ground electrode 38 are formed, the connection pad 55 and the individual electrode 35a are electrically connected. At the same time, the connection pad 60 and the ground electrode 38 are electrically connected. Therefore, the individual electrode 35a is electrically connected to the driver IC 80 via the connection pad 55 and the conductor portion 53, and the ground electrode 38 is grounded in a region not shown via the connection pad 60 and the conductor portion 54. The
[0109]
  The large number of individual electrodes 35a are connected to the driver IC 80 via individual conductor portions 53 that are independent of each other. The individual electrodes 35 a and 35 b are connected to each corresponding to each pressure chamber 10 via a conductive material 48 provided in the through holes 41 a and 42 a formed in the piezoelectric sheets 41 and 42. Accordingly, the potentials of the individual electrodes 35 a and 35 b can be controlled independently for each pressure chamber 10.
[0110]
  Each of the grounding electrodes 38 is connected to the common electrode 34 a via a conductive material 49 provided in a through hole 41 b formed in the piezoelectric sheet 41. The common electrodes 34 a and 34 b are connected via a conductive material 49 provided in the through holes 42 b and 43 b formed in the piezoelectric sheets 42 and 43. Accordingly, the common electrodes 34 a and 34 b connected to the grounding electrode 38 grounded via the connection pad 60 and the conductor portion 54 are equally maintained at the ground potential in the regions corresponding to all the pressure chambers 10.
[0111]
  Here, the common electrodes 34a and 34b may be formed in large numbers for each pressure chamber 10 so that the projection region in the stacking direction includes the pressure chamber region or the projection region is included in the pressure chamber region. It is not always necessary to be a single conductive sheet formed on the entire surface of the sheet. However, at this time, it is necessary that the common electrodes are electrically connected so that the portions corresponding to the pressure chambers 10 all have the same potential.
[0112]
  In the present embodiment, the grounding electrode 38 connected to the common electrodes 34a and 34b is grounded in a region (not shown), and a predetermined drive signal is supplied from the driver IC 80 only to the individual electrode 35a. However, a drive signal having the same action as that of grounding the electrode 38 may be supplied from the driver IC 80.
[0113]
  As described above, the head unit 70 including the actuator unit 21 bonded to the upper surface of the flow path unit 4 and the FPC 50 bonded to the upper surface are held below the holder 72 of the support member 71. . More specifically, the protrusions 73 a of the holder main body 73 of the support member 71 are arranged so as to correspond to both ends of the flow path unit 4 in the sub-scanning direction, and the portion near the opening 3 b of the lower surface 60 of the base block 75. 76 a is bonded to the upper surface of the flow path unit 4. The actuator unit 21 of the head unit 70 is spaced from the end of the upper surface of the flow path unit 4 and is disposed between the base block 75 and the flow path unit 4. As described above, since the lower end portion of the base block 75 protrudes from the groove portion 73b of the holder main body 73, there is a predetermined gap between the lower surface of the protruding portion 73a of the holder main body 73 and the upper surface of the flow path unit 4. A gap is formed.
[0114]
  Further, as shown in FIG. 3, the FPC 50 bonded to the upper surface of the actuator unit 21 is drawn out so as to pass between the lower surface of the protrusion 73 a of the holder body 73 and the upper surface of the flow path unit 4. After that, the support member 71 is disposed along the outer peripheral surface. FIG. 12 is an enlarged cross-sectional view of the vicinity of the end of the head unit 70. Here, as shown in FIG. 12, a seal member 85 is disposed between the lower surface of the protrusion 73 a of the holder main body 73 and the upper surface of the flow path unit 4 so as to sandwich the FPC 50. Therefore, the FPC 50 is fixed to the flow path unit 4 and the holder main body 73 by the seal member 85. The seal member 85 is made of a silicon-based material.
[0115]
  Further, the distance between the flow path unit 4 and the portion other than the portion 76 a near the opening 3 b on the lower surface 76 of the base block 75 is larger than the total thickness of the actuator unit 21 and the FPC 50. Therefore, when the portion 76a in the vicinity of the opening 3b of the lower surface 76 of the base block 75 and the flow path unit 4 of the head unit 70 are arranged to contact, the upper surface of the FPC 50 and the vicinity of the opening 3b in the lower surface 76 of the base block 75. A predetermined gap is formed between portions other than the portion 76a. Therefore, a predetermined gap is formed between the actuator unit 21 and the base block 75.
[0116]
  Further, as shown in FIGS. 2 and 12, at both ends in the sub-scanning direction of the nozzle plate 30 arranged in the lowermost layer of the flow path unit 4, there are provided projecting portions 30a extending in the outer direction. Yes. Six protruding portions 30a are arranged along any of the above-described end portions of the nozzle plate 30 along the longitudinal direction (main scanning direction), and are provided at predetermined intervals. The projecting portion 30 a is bent toward the holder 72 at positions corresponding to both ends of the flow path unit 4 in the sub-scanning direction. In addition, the root portion of the projecting portion 30a has a predetermined R shape, and the leading end portion of the sheet can easily enter a position facing the lower surface of the nozzle plate 30 (flow path unit 4). Further, the FPC 50 bonded and extending to the upper surface of the actuator unit 21 is also bent along the holder 72 and disposed along the support member 71.
[0117]
  Here, the protruding portions 30a are provided at both ends in the sub-scanning direction of the nozzle plate 30 so as to correspond to the paper width (standard paper width) used for printing in the printer 301 provided with the inkjet head 1. . That is, the projecting portion 30a is provided so as to correspond to the vicinity of the both ends of the sheet and the intermediate position thereof, or to correspond to the position where the vicinity of the both ends of the sheet and the interval between them are substantially equally divided.
[0118]
  Therefore, for example, when the sheet is conveyed in the arrow direction indicating the sub-scanning direction in FIG. 2, the protruding portion 30a sets X as the position on the outermost side in the main scanning direction and the origin side of the print data. A position A separated from X by a distance corresponding to the maximum standard paper width (for example, A4) that can be used, and a position corresponding to the maximum standard paper width (for example, B5) next to the maximum width from the position X. Position B, position C separated from position X by a distance corresponding to the width of the government-made postcard, position D, position E, etc. between positions B and C and between position C and position X appropriately Provided.
[0119]
  Alternatively, the nozzle plate 30 may extend a predetermined length in the outer direction at both ends in the sub-scanning direction. Also in this case, like the above-described protruding portion 30a, the root portion at both ends in the sub-scanning direction is bent toward the holder 72 so as to have a predetermined R shape. Accordingly, the FPC 50 is guided by the portion extending to the outside of the nozzle plate 30 and bent toward the holder 72 side, and is disposed along the support member 71. In such a configuration, the FPC 50 may be fixed by disposing the seal member 85 between the protruding portion 73a of the holder body 73 and the bent extended portion of the nozzle plate 30. As a result, it is possible to prevent stress from being applied to the connecting portion between the actuator unit 21 and the FPC 50 and to securely hold the FPC 50 as described later.
[0120]
  In the inkjet head 1 according to the present embodiment, the piezoelectric sheets 41 to 43 are polarized in the thickness direction. Therefore, when an electric field is applied to the piezoelectric sheets 41 to 43 by setting the individual electrodes 35a and 35b to a potential different from that of the common electrodes 34a and 34b, the portion to which the electric field is applied functions as an active layer. It stretches or contracts in the thickness direction, that is, the stacking direction, and as a result, it tends to contract or extend in the direction perpendicular to the stacking direction, that is, the plane direction due to the piezoelectric lateral effect. On the other hand, the remaining two piezoelectric sheets 44 and 45 are inactive layers that do not have a region sandwiched between the individual electrodes 35a and 35b and the common electrodes 34a and 34b, and therefore cannot be deformed spontaneously. That is, the actuator unit 21 includes three piezoelectric sheets 41 to 43 on the upper side (that is, apart from the pressure chamber 10) as the active layer layer and two lower sheets (that is, close to the pressure chamber 10). It has a so-called unimorph type configuration in which the piezoelectric sheets 44 and 45 are inactive layers.
[0121]
  Therefore, when the driver IC 80 is controlled so that the electric field and polarization are in the same direction and the individual electrodes 35a and 35b are set to a predetermined positive or negative potential, the individual electrodes 35a and 35b of the piezoelectric sheets 41 to 43 and the common electrode 34a, The active layer sandwiched between 34b contracts in the surface direction, while the piezoelectric sheets 44 and 45 do not spontaneously contract. At this time, as shown in FIG. 10A, the lower surfaces of the piezoelectric sheets 41 to 45 are fixed to the upper surfaces of the partition walls defining the pressure chambers 10 formed in the cavity plate 22. As a result, the piezoelectric sheets 41 to 45 are deformed so as to be convex toward the pressure chamber 10 (unimorph deformation). Then, the volume of the pressure chamber 10 decreases, the pressure of the ink increases, and ink is ejected from the ink ejection port 8. Thereafter, when the potentials of the individual electrodes 35a and 35b are restored, the piezoelectric sheets 41 to 45 have the original flat plate shape, and the volume of the pressure chamber 10 is restored to the original volume, so that ink is sucked from the manifold 5 side.
[0122]
  As another driving method, the individual electrodes 35a and 35b are set to potentials different from the common electrodes 34a and 34b in advance, and the individual electrodes 35a and 35b are temporarily set to the same potential as the common electrodes 34a and 34b every time there is a discharge request. Thereafter, the individual electrodes 35a and 35b can be set to potentials different from those of the common electrodes 34a and 34b again at a predetermined timing. In this case, at the timing when the individual electrodes 35a and 35b and the common electrodes 34a and 34b become the same potential, the piezoelectric sheets 41 to 45 return to the original shape, and the volume of the pressure chamber 10 is in an initial state (the potentials of both electrodes are The ink is sucked into the pressure chamber 10 from the manifold 5 side. After that, at the timing when the individual electrodes 35a and 35b are set to potentials different from those of the common electrodes 34a and 34b, the piezoelectric sheets 41 to 45 are deformed so as to protrude toward the pressure chamber 10, and the volume of the pressure chamber 10 decreases to reduce the ink. The pressure rises and ink is ejected.
[0123]
  If the direction of the electric field applied to the piezoelectric sheets 41 to 43 is opposite to the polarization direction, the piezoelectric sheets 41 to 43 sandwiched between the individual electrodes 35a and 35b and the common electrodes 34a and 34b due to the piezoelectric lateral effect. The active layer tends to extend in a direction perpendicular to the polarization direction. Accordingly, the piezoelectric sheets 41 to 45 are deformed so as to be concave toward the pressure chamber 10 based on the piezoelectric lateral effect. For this reason, the volume of the pressure chamber 10 increases and ink is sucked from the manifold 5 side. After that, when the potentials of the individual electrodes 35a and 35b are restored, the piezoelectric sheets 41 to 45 have the original flat plate shape, and the volume of the pressure chamber 10 is restored to the original volume, and thus ink is ejected from the ink ejection port 8.
[0124]
  In the present embodiment, as described above, the base block 75 is disposed in the groove 73b of the holder main body 73, and the holder main body 73 has a skirt-like portion (skirt portion) that covers the base block 75. It can be seen that Here, the skirt portion of the holder main body 73 has a function as a reinforcing member that improves the strength of the support member 71. The FPC 50 is fixed by a seal member 85 between the skirt portion of the holder main body 73 and the flow path unit 4. Therefore, it is possible to prevent bending when the head is elongated, prevent stress from being applied to the connecting portion between the actuator unit 21 and the FPC 50, and reliably hold the FPC 50.
[0125]
  As described above, in the inkjet head 1 of the present embodiment, the FPC 50 including the conductor portions 53 and 54 that are electrically connected to the actuator unit 21 includes the portion near the end of the flow path unit 4 and the support member 71. Since the seal member 85 is fixed to the holder 72, which is a part, even when a force such as peeling from the actuator unit 21 is applied to the FPC 50 from the outside, a large force is applied to the connection portion between the actuator unit 21 and the FPC 50. Is prevented from being added directly. Therefore, the FPC 50 is less likely to be peeled off from the actuator unit 21, so that the reliability of electrical connection between the actuator unit 21 and the driver IC 80 can be improved. In addition, the holder 72 which is a part of the support member 71 can reduce the stress applied to the connecting portion between the actuator 21 and the FPC 50 (to try to peel them off) as the entire head bends. Further, it is possible to prevent the conductive ink from entering the connecting portion between the actuator unit 21 and the FPC 50 for some reason from the outside. Therefore, it is possible to prevent an electrical short circuit between the connecting portions. As a result, the reliability of the electrical connection of the inkjet printer 301 can be improved.
[0126]
  In addition, since the conductor portions 53 and 54 are included in the FPC 50, even when a force such as peeling from the actuator unit 21 is applied to the conductor portions 53 and 54 from the outside, the force is further dispersed. The parts 53 and 54 are more difficult to peel off from the actuator unit 21. Therefore, the reliability of the electrical connection between the actuator unit 21 and the driver IC 80 can be further improved.
[0127]
  Further, since the support member 71 includes a base block 75 in which the ink reservoir 3 serving as a flow path for the ink supplied to the flow path unit 4 is formed, the head 71 has a head against the flow path unit 4 that consumes ink. Even when the length of the ink is increased, the ink can be stably supplied, so that the structure is simplified as a whole. Furthermore, since the base block 75 itself has the partition wall 75a disposed in the internal space, it functions as a lightweight reinforcing structure and contributes to improving the strength of the inkjet head 1.
[0128]
  In addition, since a predetermined gap is formed between the base block 75 and the actuator unit 21, the operation of the actuator unit 21 (displacement of the piezoelectric sheets 41 to 45) is not hindered, and the actuator unit 21 and the FPC 50 are externally connected. It is possible to suppress the force from being directly applied to the connecting portion.
[0129]
  Further, in the inkjet head 1, the protruding portions 30 a provided along the longitudinal direction at both ends in the sub-scanning direction of the nozzle plate 30 disposed in the lowermost layer of the flow path unit 4 are bent toward the holder 72 side. Therefore, even if the leading edge of the sheet collides with the protruding portion 30a, it is easy to enter while being guided to a position facing the head 1. Therefore, it is possible to prevent the leading edge of the paper from colliding with the side surface of the head 1 and causing a paper jam or failure of the head 1. Further, since the nozzle plate 30 is used to prevent the leading edge of the paper from colliding with the side surface of the head 1, it is not necessary to prepare another member, and the cost is low. There is almost no growth. Therefore, a paper jam in the vicinity of the head 1 and a failure of the head 1 are unlikely to occur, and an ink jet printer 301 that can be manufactured at a low cost is obtained.
[0130]
  The FPC 50 fixed and extending on the upper surface of the actuator unit 21 is guided by a portion extending to the outside of the nozzle plate 30 and bent toward the holder 72 side. Here, since the upper end portion of the protruding portion 30a of the nozzle plate 30 is closer to the holder 72 than the connection portion between the actuator unit 21 and the FPC 50, the bent nozzle plate 30 causes an impact force generated when the paper collides. Is not transmitted directly to the FPC50. As a result, the reliability of the electrical connection between the actuator unit 21 and the FPC 50 can be further improved.
[0131]
  Moreover, since it is sufficient to bend only the protruding portion 30a provided on the nozzle plate 30 instead of the entire vicinity of the end portion of the nozzle plate 30, the processing is easy.
[0132]
  Further, the protruding portion 30a is provided so as to correspond to the vicinity of the both ends of the sheet and the intermediate position thereof, or to correspond to the position where the vicinity of the both ends of the sheet and the portion between them are substantially equally divided. The leading end of the sheet is likely to enter the position facing the head 1. Therefore, the flow of paper becomes smooth.
[0133]
  Next, a first modification of the embodiment of the present invention will be described with reference to the drawings. FIG. 13 is an enlarged cross-sectional view of the vicinity of the end of the head unit of the inkjet head according to the first modification of the embodiment of the present invention. The inkjet head 101 in FIG. 13 is different from the inkjet head 1 in FIG. 2 in that the FPC 50 is located between the upper surface of the flow path unit 4 and the lower surface of the protrusion 73a of the holder body 73 in the inkjet head 1 in FIG. In contrast to the flow path unit 4 and the holder main body 73 fixed by the arranged sealing member 85, in the inkjet head 101 of FIG. 13, the FPC 50 has the upper surface of the flow path unit 4 and the protrusion of the holder main body 73. It is the point clamped by both between the lower surfaces of the part 73a. Other configurations are the same as those of the inkjet head 1 in FIG.
[0134]
  Here, in the inkjet head 101 of the first modified example, the FPC 50 electrically connected to the actuator unit 121 is sandwiched between the projecting portion 73a of the holder main body 73 and the flow path unit 4, and thus the FPC 50 from the outside. Even when a force such as peeling off from the actuator unit 121 is applied, it is possible to prevent a large force from being directly applied to the connecting portion between the actuator unit 121 and the FPC 50. Accordingly, since the FPC 50 is less likely to be peeled off from the actuator unit 121, the reliability of the electrical connection between the actuator unit 121 and the driver IC 80 can be improved as in the present embodiment.
[0135]
  In this case, a seal member 85 may be disposed in the holding portion between the protruding portion 73a of the holder main body 73 and the flow path unit 4 in the same manner as the inkjet head 1 in FIG. Accordingly, it is possible to prevent the conductive ink from entering the connecting portion between the actuator unit 121 and the FPC 50 through the sandwiching portion for some reason from the outside.
[0136]
  Next, a second modification of the embodiment of the present invention will be described with reference to the drawings. FIG. 14 is an enlarged cross-sectional view of the vicinity of the end of the head unit of the ink jet head according to the second modification of the embodiment of the present invention. 14 differs from the inkjet head 1 in FIG. 2 in that the FPC 50 is located between the upper surface of the flow path unit 4 and the lower surface of the protrusion 73a of the holder body 73. 14 is fixed to the flow path unit 4 and the holder main body 73 by the arranged sealing member 85, whereas in the inkjet head 201 of FIG. 14, the FPC 50 is connected to the upper end portion of the actuator unit 21 and the holder main body 73. It is a point clamped by both between the lower surfaces of the protrusion part 73a. Other configurations are the same as those of the inkjet head 1 in FIG.
[0137]
  Here, in the ink jet head of the second modified example, the actuator unit 221 is provided to the vicinity of the end on the upper surface of the flow path unit 4, and the FPC 50 electrically connected to the actuator unit 221 is connected to the holder main body 73. Since the protrusion 73a and the actuator unit 221 are sandwiched between the actuator unit 221 and the FPC 50, a large force is directly applied to the connecting portion between the actuator unit 221 and the FPC 50. Is prevented from being added. Therefore, the FPC 50 is unlikely to be peeled off from the actuator unit 221, and the reliability of electrical connection between the actuator unit 221 and the driver IC 80 can be improved as in the present embodiment. In addition, it cannot be overemphasized that the above-mentioned effect becomes more reliable by arrange | positioning the sealing member 85 in the clamping part in this modification.
[0138]
  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and various design changes can be made as long as they are described in the claims. Is. For example, in the above-described embodiment, the conductor part 53 that is a wiring for connecting the connection pad 55 connected to the individual electrode 35a and the driver IC 80 and the conductor part 54 that is a wiring for grounding the connection pad 60 are provided. However, the present invention is not limited to this, and at least one of the wiring for connecting the connection pad and the driver IC and the wiring for grounding the connection pad is a single signal line. It may be arranged. Here, in particular, when the conductor portion 53 that is a wiring for connecting the connection pad 55 connected to the individual electrode 35 a occupying the majority of the conductor portions and the driver IC 80 is formed on the FPC 50. The same effect as this embodiment can be obtained.
[0139]
  In the above-described embodiment, the case where the support member 71 includes the base block 75 in which the ink reservoir 3 that becomes the flow path of the ink supplied to the flow path unit 4 is formed has been described. The support member does not necessarily include the base block in which the ink reservoir is formed.
[0140]
  In the above-described embodiment, the case where a predetermined gap is formed between the base block 75 and the actuator unit 21 has been described. However, it is not always necessary to form a gap between the two, You may arrange | position so that both may contact.
[0141]
  In the above-described embodiment, the case where the common electrodes 34a and 34b are grounded is described. However, the present invention is not limited to this, and the common electrode is not necessarily grounded. In the range in which the same operation as that of the embodiment is possible, a drive signal different from the drive signal supplied to the individual electrode may be supplied to the common electrode.
[0142]
  Further, in the above-described embodiment, a case is described in which only the six projecting portions 30a provided at predetermined intervals on both ends of the nozzle plate 30 in the sub-scanning direction are bent. However, the present invention is not limited to this, and the entire vicinity of the end of the nozzle plate may be bent without providing the protruding portion on the nozzle plate. Moreover, even if it is a case where a convex part is provided, the number and arrangement | positioning can be changed arbitrarily. Therefore, the projecting portion may be arranged to be separated by a distance corresponding to half of the width of the standard paper, with the position X serving as the reference position being the central portion in the longitudinal direction, as in the present embodiment. It is not always necessary to be provided so as to correspond to the standard sheet width, and a plurality of protruding portions may be arranged at equal intervals. Further, in the nozzle plate 30, the bent portion or the protruding portion that protrudes in the sub-scanning direction does not necessarily exist at both ends in the sub-scanning direction, and is provided at least upstream in the sub-scanning direction of the nozzle plate. It only has to be done.
[0143]
  In addition, the material of the piezoelectric sheet or electrode is not limited to the above-described material, and may be changed to other known materials. Moreover, you may change suitably the planar shape, cross-sectional shape, arrangement | positioning form, etc. of a pressure chamber. Further, the number of piezoelectric sheets including the active layer and the number of piezoelectric sheets not including the active layer can be appropriately changed. The layer thicknesses of the piezoelectric sheet including the active layer and the piezoelectric sheet not including the active layer may be the same or different. Moreover, you may use insulating sheets other than a piezoelectric sheet as an inactive layer.
[0144]
【The invention's effect】
  As described above, according to claim 1, the actuator unit is electrically connected.Flexible cableIs sandwiched between the support member and the flow path unit or actuator unit.Flexible cableEven if force is applied to the actuator unit to remove it from the actuator unit,Flexible cableIt is suppressed that a large force is directly applied to the connecting portion. Therefore,Flexible cableSince it is difficult to peel off from the actuator unit, the reliability of electrical connection between the actuator unit and the power supply unit can be improved.In addition, since the conductive pattern connected to the individual electrode and the common electrode is formed on the flexible cable, even when a force that peels the conductive pattern from the actuator unit from the outside is applied, Further, since the conductive pattern is further dispersed, the conductive pattern is further hardly peeled off from the actuator unit. Therefore, the reliability of the electrical connection between the actuator unit and the power supply unit can be further improved.
[0145]
  According to claim 2, from the outsideFlexible cableEven if force is applied to the actuator unit to remove it from the actuator unit,Flexible cableIt is further suppressed that a large force is directly applied to the connecting portion.
[0146]
  According to the third aspect, the conductive ink for some reason is externally connected to the actuator unit via the sandwiching portion.Flexible cableCan be prevented from entering the connecting portion.
[0147]
[0148]
[0149]
  According to claim 4, the actuator unit is electrically connected.Flexible cableIs fixed to the support member and the flow path unit or the actuator unit by the seal member.Flexible cableEven if force is applied to the actuator unit to remove it from the actuator unit,Flexible cableIt is suppressed that a large force is directly applied to the connecting portion. Therefore,Flexible cableSince it is difficult to peel off from the actuator unit, the reliability of electrical connection between the actuator unit and the power supply unit can be improved. In addition, for some reason, conductive ink from the outside mayFlexible cableCan be prevented from entering the connecting portion. Therefore, it is possible to prevent an electrical short circuit between the connecting portions.In addition, the conductive pattern connected to the individual electrode and the common electrode is placed on the flexible cable. Therefore, even when a force for peeling off the conductive pattern from the actuator unit is applied to the conductive pattern from the outside, this force is further dispersed, so that the conductive pattern is more difficult to peel off from the actuator unit. Therefore, the reliability of the electrical connection between the actuator unit and the power supply unit can be further improved.
[0150]
  According to claim 5, from the outsideFlexible cableEven if force is applied to the actuator unit to remove it from the actuator unit,Flexible cableIt is further suppressed that a large force is directly applied to the connecting portion.
[0151]
[0152]
[0153]
  Claim6Accordingly, even when the head is elongated with respect to the flow path unit that consumes ink, the ink can be stably supplied from the ink supply member included in the support member, so that the structure is simplified as a whole.
  Claim7According to the above, since the predetermined gap is formed between the support member and the actuator unit, the operation of the actuator unit is not hindered and the actuator unit is externally connected.Flexible cableIt is suppressed that force is directly applied to the connecting portion.
  Claim11, 12According to the above, the bent nozzle plate directly affects the impact force generated when the paper collides.Flexible cableNot communicated to. As a result, the actuator unitFlexible cableThe reliability of the electrical connection with can be further improved.
  Claim13According to the actuator unitFlexible cablePreventing stress from being applied to the connectionFlexible cableCan be securely held.
[0154]
    Claim14According to the actuator unit electrically connectedConductive patternSince the flexible cable formed with is fixed to the holder near the end of the flow path unit and the holder that is a part of the support member by a sealing member, the force that pulls the flexible cable from the actuator unit from the outside Even when is applied, it is possible to suppress a large force from being directly applied to the connecting portion between the actuator unit and the flexible cable. Therefore, since the flexible cable is difficult to peel off from the actuator unit, the reliability of the electrical connection between the actuator unit and the power supply unit can be improved. In addition, the holder that is a part of the support member can reduce the stress applied to the connecting portion between the actuator and the flexible cable (there is an attempt to peel them off) by bending the entire head. Further, it is possible to prevent the conductive ink from entering the connecting portion between the actuator unit and the flexible cable for some reason from the outside. Therefore, it is possible to prevent an electrical short circuit between the connecting portions. The above-described effects can be similarly obtained even in a long head in which a plurality of actuator units are stacked on a stacked flow path unit.
[0155]
  Claim15According to the above, since a predetermined gap is formed between the ink supply member and the actuator unit, the operation of the actuator unit is not hindered, and a force is directly applied to the connecting portion between the actuator unit and the flexible cable from the outside. Is suppressed.
[0156]
  Claim16According to the above, the bent nozzle plate directly affects the impact force generated when the paper collides.Flexible cableNot communicated to. As a result, the actuator unitFlexible cableThe reliability of the electrical connection with can be further improved.
[0157]
[0158]
[0159]
[0160]
[0161]
[Brief description of the drawings]
FIG. 1 is a schematic view of an ink jet printer including an ink jet head according to an embodiment of the present invention.
FIG. 2 is an external perspective view of an ink jet head according to the present embodiment.
3 is a cross-sectional view taken along line III-III in FIG.
4 is a plan view of a head unit included in the inkjet head depicted in FIG. 2. FIG.
FIG. 5 is an enlarged view of a region surrounded by an alternate long and short dash line drawn in FIG. 4;
6 is an enlarged view of a region surrounded by an alternate long and short dash line drawn in FIG. 5. FIG.
7 is a partial cross-sectional view of the head unit depicted in FIG. 2 and a flexible printed wiring board affixed thereto. FIG.
8 is an enlarged view of a region surrounded by a two-dot chain line drawn in FIG.
FIG. 9 is a partially exploded perspective view of the head unit depicted in FIG. 2 and a flexible printed wiring board attached to the head unit.
FIG. 10A is a cross-sectional view of the actuator unit to which a flexible printed wiring board is attached, taken along line XA-XA drawn in FIG. 6, and is drawn in FIG. It is an enlarged view of the area | region enclosed with the dashed-dotted line.
  FIG. 10B is a cross-sectional view of the actuator unit to which the flexible printed wiring board is attached along the XB-XB line drawn in FIG.
  FIG. 10C is an enlarged view inside a round frame drawn by a one-dot chain line in FIG.
  FIG. 10D is an enlarged view in a round frame drawn by a one-dot chain line in FIG.
11 is a schematic partially enlarged plan view of FIG. 6. FIG.
FIG. 12 is an enlarged cross-sectional view of the vicinity of the end of the head unit.
FIG. 13 is an enlarged cross-sectional view of the vicinity of the end of the head unit of the inkjet head according to the first modification of the embodiment of the present invention.
FIG. 14 is an enlarged cross-sectional view of the vicinity of an end portion of a head unit of an inkjet head according to a second modification of the embodiment of the present invention.
[Explanation of symbols]
  1, 101, 201 Inkjet head
  3 Ink pool
  4 Channel unit
  5 Manifold
  5a Sub manifold
  8 Ink outlet
  10 Pressure chamber
  12 Aperture
  21, 121, 221 Actuator unit
  30 Nozzle plate
  30a Projecting part
  32 Ink flow path
  34a, 34b Common electrode
  35a, 35b Individual electrode
  41-43 Piezoelectric sheet
  44, 45 Piezoelectric sheet
  50 Flexible Printed Circuit Board (FPC) (Flexible cable)
  53, 54 Conductor (signal line)
  70 head unit
  71 Support member
  72 Holder
  73 Holder body
  73a Protruding part
  75 Base block (ink supply source)
  85 Sealing member
  301 Inkjet printer

Claims (16)

  1. A flow path unit in which a plurality of pressure chambers communicating with one end to a nozzle for ejecting ink and the other end to an ink supply source for supplying ink are adjacently disposed along a plane, and for changing the volume of the pressure chamber An actuator unit disposed on the surface of the flow path unit , and having an individual electrode to which a drive signal is supplied and a common electrode to which a drive signal different from the drive signal supplied to the individual electrode is supplied Having a head unit;
    A flexible cable electrically connected to the actuator unit , wherein a conductive pattern electrically connected to the individual electrode and a conductive pattern electrically connected to the common electrode are formed ;
    A support member for supporting the head unit across the actuator unit;
    The flexible cable is separated from a connection portion with the actuator unit in a direction in which the flexible cable is drawn from between the support member and the head unit, and the support member and the flow path unit or the actuator unit An ink jet head characterized by being sandwiched between.
  2. 2. The inkjet head according to claim 1, wherein the flexible cable is sandwiched between the support member and the flow path unit or the actuator unit in a vicinity of an end of the flow path unit.
  3. The inkjet head according to claim 1, wherein a sealing member is disposed at a holding portion of the flexible cable .
  4. A flow path unit in which a plurality of pressure chambers communicating with one end to a nozzle for ejecting ink and the other end to an ink supply source for supplying ink are adjacently disposed along a plane, and for changing the volume of the pressure chamber An actuator unit disposed on the surface of the flow path unit , and having an individual electrode to which a drive signal is supplied and a common electrode to which a drive signal different from the drive signal supplied to the individual electrode is supplied Having a head unit;
    A flexible cable electrically connected to the actuator unit , wherein a conductive pattern electrically connected to the individual electrode and a conductive pattern electrically connected to the common electrode are formed ;
    A support member for supporting the head unit across the actuator unit;
    The support member, and a seal member disposed between the flow path unit or the actuator unit,
    The flexible cable is separated from a connection portion with the actuator unit in a direction in which the flexible cable is pulled out from between the support member and the head unit, and is connected to the support member and the flow path unit or the actuator unit. An ink jet head fixed by the sealing member.
  5. The inkjet head according to claim 4, wherein the flexible cable is fixed by the seal member in a portion near the end of the flow path unit.
  6. Wherein the support member, the ink-jet head according to any one of claims 1 to 5, characterized in that it includes an ink supply member for supplying ink to the passage unit.
  7. Wherein between the support member and the actuator unit, the ink-jet head according to any one of claims 1 to 6, characterized in that the predetermined gap is formed.
  8. The inkjet head according to claim 7 , wherein the flexible cable is connected to an upper surface of the actuator unit, and a predetermined gap is formed between the support member and the flexible cable .
  9. The actuator unit is disposed on the pressure chamber side, and is a continuous plate-like insulating sheet as an inactive layer provided across the plurality of pressure chambers, and the side opposite to the pressure chamber with respect to the inactive layer And a piezoelectric sheet as an active layer polarized in the thickness direction,
    The active layer is, the common electrode and is sandwiched by said individual electrodes formed corresponding to the pressure chamber, when said individual electrodes is different from the common electrode potential, the active layer piezoelectric transverse A unimorph deformation due to a difference in strain between the active layer and the non-active layer is caused by contracting or extending in a direction orthogonal to the thickness direction due to an effect, thereby changing the volume of the pressure chamber. The inkjet head according to any one of claims 1 to 8 .
  10. The support member and the actuator unit, the ink-jet head according to any one of claims 1 to 5, characterized in that it is placed in contact with each other.
  11. The flow path unit is a laminate of a plurality of plate members including a nozzle plate in which a plurality of the nozzles are formed,
    The nozzle plate has an extending part extending in an outer direction of the nozzle plate from an end part along a longitudinal direction of the nozzle plate,
    The extending portion is bent toward the support member, and a plurality of the extending portions are disposed along the longitudinal direction.
    The flexible cable, the ink jet head according to any one of claims 1 to 10, characterized in that is disposed along said support member by said extending portion.
  12. The flow path unit is a laminate of a plurality of plate members including a nozzle plate in which a plurality of the nozzles are formed,
    The nozzle plate has an extending part extending in an outer direction of the nozzle plate from an end part along a longitudinal direction of the nozzle plate,
    The extending portion is bent toward the support member, and is disposed over the entire length of the nozzle plate in the longitudinal direction.
    The flexible cable, the ink jet head according to any one of claims 1 to 10, characterized in that is disposed along said support member by said extending portion.
  13. The inkjet head according to claim 11 or 12 , wherein the flexible cable is fixed by a seal member disposed between the support member and the extending portion.
  14. A flow path unit including a plurality of stacked plates and a plurality of pressure chambers that are adjacent to each other along a plane and communicate with one end of a nozzle that ejects ink and the other end of an ink supply member that supplies ink; The flow path unit includes an individual electrode to which a drive signal is supplied and a common electrode to which a drive signal different from the drive signal supplied to the individual electrode is provided in order to change the volume of the pressure chamber. A head unit having an actuator unit disposed on the surface of the uppermost layer so as to be separated from the end of the flow path unit;
    A flexible cable electrically connected to the actuator unit , wherein a conductive pattern electrically connected to the individual electrode and a conductive pattern electrically connected to the common electrode are formed ;
    A support member for supporting the head unit with the actuator unit sandwiched between the ink supply member and a holder for fixing the ink supply member;
    A seal member disposed between an end portion vicinity of the flow path unit and the holder;
    The flexible cable is separated from a connection portion with the actuator unit in a direction in which the flexible cable is pulled out from between the support member and the head unit, and is near the end portion of the flow path unit and the holder. And an ink jet head fixed by the sealing member.
  15. Between the actuator unit and said ink supply member, the ink-jet head according to claim 1 4, characterized in that the predetermined gap is formed.
  16. The flow path unit includes a nozzle plate that is disposed in the lowermost layer of the flow path unit and in which a plurality of the nozzles are formed.
    The nozzle plate has a projecting portion extending in an outer direction of the nozzle plate from an end portion along the longitudinal direction of the nozzle plate,
    The projecting portion is bent toward the support member, and a plurality of the projecting portions are arranged along the longitudinal direction.
    The flexible cable is fixed by a seal member disposed between the support member and the projecting portion, and is disposed along the support member by the projecting portion. The inkjet head according to claim 14 or 15 .
JP2003038779A 2002-02-18 2003-02-17 Inkjet head Active JP4206775B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP2002-40559 2002-02-18
JP2002040559 2002-02-18
JP2002-43592 2002-02-20
JP2002043592 2002-02-20
JP2003038779A JP4206775B2 (en) 2002-02-18 2003-02-17 Inkjet head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003038779A JP4206775B2 (en) 2002-02-18 2003-02-17 Inkjet head

Publications (2)

Publication Number Publication Date
JP2003311953A JP2003311953A (en) 2003-11-06
JP4206775B2 true JP4206775B2 (en) 2009-01-14

Family

ID=29553963

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2003038779A Active JP4206775B2 (en) 2002-02-18 2003-02-17 Inkjet head

Country Status (1)

Country Link
JP (1) JP4206775B2 (en)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7568783B2 (en) * 2004-01-29 2009-08-04 Brother Kogyo Kabushiki Kaisha Inkjet head
JP3978681B2 (en) 2004-03-26 2007-09-19 富士フイルム株式会社 Ink jet recording head and ink jet recording apparatus
JP2005280044A (en) 2004-03-29 2005-10-13 Brother Ind Ltd Process of manufacturing inkjet head
JP2005305982A (en) 2004-04-26 2005-11-04 Brother Ind Ltd Ink-jet head
JP4517766B2 (en) * 2004-08-05 2010-08-04 ブラザー工業株式会社 Ink discharge amount correction method for line type ink jet printer
JP4517767B2 (en) * 2004-08-05 2010-08-04 ブラザー工業株式会社 Line-type inkjet printer
JP4604608B2 (en) 2004-08-24 2011-01-05 ブラザー工業株式会社 Composite substrate and inkjet printer
JP4419754B2 (en) 2004-08-27 2010-02-24 ブラザー工業株式会社 Inkjet head
JP4774755B2 (en) * 2004-09-09 2011-09-14 富士ゼロックス株式会社 Recording head driving apparatus and driving method
JP4661228B2 (en) * 2005-01-13 2011-03-30 セイコーエプソン株式会社 Droplet discharge head and droplet discharge apparatus
JP2006205670A (en) 2005-01-31 2006-08-10 Brother Ind Ltd Inkjet head
US7597422B2 (en) 2005-07-28 2009-10-06 Brother Kogyo Kabushiki Kaisha Ink-jet printer, head for ink-jet printer and flexible cable usable for the same
US7553000B2 (en) 2005-07-28 2009-06-30 Brother Kogyo Kabushiki Kaisha Ink-jet printer, head for ink-jet printer and flexible cable usable for the same
JP2007130777A (en) 2005-11-08 2007-05-31 Brother Ind Ltd Inkjet recorder
JP2008018691A (en) * 2006-07-14 2008-01-31 Olympus Corp Image recorder
JP5286882B2 (en) * 2008-03-28 2013-09-11 ブラザー工業株式会社 Liquid discharge head, manufacturing method thereof, and recording apparatus
JP5564935B2 (en) * 2009-12-24 2014-08-06 セイコーエプソン株式会社 Ink jet head and liquid droplet ejection apparatus equipped with the same
JP5776461B2 (en) * 2011-09-13 2015-09-09 株式会社リコー Inkjet head, inkjet recording apparatus, and inkjet head manufacturing method
WO2014104109A1 (en) * 2012-12-26 2014-07-03 京セラ株式会社 Liquid ejection head and recording device provided with same
JP2014198457A (en) * 2013-03-14 2014-10-23 株式会社リコー Droplet discharge head and droplet discharge device
JP6338994B2 (en) * 2014-09-30 2018-06-06 京セラ株式会社 Inkjet head and printer

Also Published As

Publication number Publication date
JP2003311953A (en) 2003-11-06

Similar Documents

Publication Publication Date Title
US10821730B2 (en) Ink-jet head having passage unit and actuator units attached to the passage unit, and ink-jet printer having the ink-jet head
US7278710B2 (en) Inkjet head
US7263752B2 (en) Method for manufacturing an ink-jet head
JP4419754B2 (en) Inkjet head
US10232614B2 (en) Inkjet head, inkjet head subassembly, inkjet head assembly and inkjet printer
EP1338419B1 (en) Ink-jet head and ink-jet printer
US7086711B2 (en) Inkjet printing apparatus and actuator controller and actuator controlling method used in inkjet printing apparatus
US7008049B2 (en) Inkjet head
US20030107622A1 (en) Piezoelectric actuator
US7500736B2 (en) Inkjet head
JP5151473B2 (en) Inkjet recording device
JP2005022137A (en) Inkjet head
JP4543847B2 (en) Line-type inkjet printer
EP1338421B1 (en) Ink-jet head, method for it's manufacturing, and ink-jet printer
US7008048B2 (en) Ink-jet head and ink-jet printer having ink-jet head
JP4582009B2 (en) Inkjet head
JP4259544B2 (en) Inkjet printer
US7374277B2 (en) Ink-jet head
EP1980402A1 (en) Ink-jet head and ink-jet printer
EP1506862B1 (en) Inkjet head printing device
DE60313232T2 (en) Inkjet head and inkjet printer
JP3991952B2 (en) Inkjet head
JP5822624B2 (en) Liquid discharge head and recording apparatus using the same
US9144967B2 (en) Piezoelectric actuator, liquid discharge head, and recording device
JP2005059438A (en) Ink jet head

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20050318

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20070927

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20071009

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20071210

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20080226

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20080424

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20080924

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20081007

R150 Certificate of patent or registration of utility model

Ref document number: 4206775

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111031

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111031

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20121031

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20131031

Year of fee payment: 5