JP2015231722A - Liquid injection head and liquid injection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid injection head provided with a flow passage member increasing air bubble chambers as much as possible and being free of the possibility of choke of a filter even when variations of consumption of filter chambers are increased.SOLUTION: A liquid injection head comprises: a head main body; and a flow passage member 240 having a flow passage supplying liquid to the head main body, a filter 244 provided in the course of the flow passage, filter chambers consisting of an upstream filter chamber at an upstream side and a downstream filter chamber at a downstream side of the filter 244 and accommodating the filter 244 and air bubble chambers 315 and 325 communicating with the upstream filter chamber and storing air bubbles removed by the filter 244. The liquid injection head has a first nozzle group and a second nozzle group having positions in a second direction perpendicular to a first direction on a liquid injection surface different from each other and at least parts of positions in the first direction overlapping with each other. A flow passage of the flow passage member branches in the course thereof and includes a branch flow passage communicating with the first nozzle group and the second nozzle group, and the air bubble chambers 315 and 325 are provided for each branch flow passage.

Description

  The present invention relates to a liquid ejecting head including a flow path member in which a flow path through which a liquid flows is formed, and a liquid ejecting apparatus including the flow path member.

  A liquid ejecting apparatus typified by an ink jet recording apparatus such as an ink jet printer or a plotter includes a liquid ejecting head capable of ejecting a liquid such as ink stored in a cartridge or a tank. Some liquid ejecting heads include a plurality of head main bodies that eject liquid, and a flow path member that holds the head main body and has a flow path for ink supplied to the head main body.

  Some of the flow path members use a part of the filter chamber as a bubble chamber for storing bubbles. For example, the shape of the filter 33 in which the bubble chamber 95 is provided on the upper side in the vertical direction is matched with the shape of the meniscus of the ink that has entered the bubble chamber 95 from the upstream, thereby delaying the contact between the meniscus and the filter 33. There has been proposed one that has the effect of increasing the maintenance interval without increasing the volume of the bubble chamber 95 (see Patent Document 1).

JP2013-129060A

  In Patent Document 1 described above, the flow member is not considered to be downsized in the transport direction of the print medium, and the volume of the bubble chamber is set as small as possible while the flow path member is downsized in the transport direction. The desire to increase it has not been considered.

  Also, depending on the variation in the liquid consumption in the filter chamber, there is a risk that a large volume of air bubbles may block the filter, but there is no problem even if there is a variation in the liquid consumption in the filter chamber. The arrangement of is not considered.

  Such a demand exists not only in an ink jet recording apparatus but also in a liquid ejecting apparatus that ejects liquid other than ink.

  In view of such circumstances, the present invention uses a flow path member with an increased bubble chamber as much as possible. However, the liquid jet includes a flow path member that does not block the filter even when the variation in the consumption of the filter chamber increases. An object is to provide a liquid ejecting apparatus including a head and a flow path member.

[Aspect 1] An aspect of the present invention is a head body that ejects liquid droplets from a nozzle group having nozzle openings whose positions in the first direction are different from each other on the liquid ejection surface, and a flow path that supplies liquid to the head body A filter provided in the middle of the flow path, an upstream filter chamber on the upstream side of the filter and a downstream filter chamber on the downstream side, and a filter chamber for housing the filter, which communicates with the upstream filter chamber A flow path member having a bubble chamber for storing bubbles removed by the filter, the positions in the second direction orthogonal to the first direction are different from each other on the liquid ejection surface, and the first A first nozzle group and a second nozzle group that overlap at least partially in the direction of the first direction, and the flow path of the flow path member branches in the middle of the first nozzle group. Wherein the second nozzle group includes a branch passage communicating the bubble chamber there is provided a liquid ejecting head, characterized in that provided for each of the branch channel.
In this aspect, the bubble chamber is provided for each flow path branched into the first nozzle group and the second nozzle group, the positions in the second direction being different from each other and the position in the first direction overlapping at least partially. Therefore, even if there is variation in the amount of liquid consumed in each filter chamber, the amount of bubbles stored in the bubble chamber is less likely to vary because the position in the first direction overlaps at least partially. A liquid ejecting head including a flow path member capable of suppressing bubbles from blocking a certain filter chamber can be realized. The nozzles of the first and second nozzle groups may have the same position in the first direction, may be shifted by a half pitch of the nozzle pitch, and the position in the first direction There may be one nozzle at both ends of the second nozzle group between the nozzles at both ends of the nozzle group.

  [Aspect 2] Here, in the liquid jet head according to Aspect 1, the first nozzle group includes a first nozzle row and a second nozzle row along the first direction, and the second nozzle group. Has a third nozzle row and a fourth nozzle row along the first direction, and the amount of the first nozzle row and the second nozzle row overlapping each other with respect to the position in the first direction is: The amount by which the third nozzle row and the fourth nozzle row overlap each other at a position in the first direction is smaller than the amount by which the first nozzle row and the third nozzle row overlap each other. Less than the amount of the two nozzle rows and the fourth nozzle row overlapping each other, the bubbles in the bubble chamber corresponding to each nozzle row can move in common with each other in the first nozzle row and the second nozzle row. A first communicating bubble chamber is provided; A second communicating bubble chamber in which bubbles in the bubble chamber corresponding to each nozzle row can move relative to each other is provided in common with each of the nozzle row and the fourth nozzle row, and the first communicating bubble chamber is provided for each branch flow path. It is preferable that one of the bubble chambers is provided in the first gas chamber, and the second communication bubble chamber is the other bubble chamber provided for each branch flow path. According to this, since there are bubble chambers in which the stored bubbles communicate with each other so as to be movable, the amount of bubbles stored in each filter chamber can be increased. Further, paying attention to the amount of overlapping of the nozzle rows in the first direction, the nozzle rows having a relatively small amount of overlapping, for example, the first nozzle row and the second nozzle row, the third nozzle row and the fourth nozzle row The bubble chambers communicate with each other between the nozzle rows, and the nozzle rows having a relatively large amount of overlap, for example, between the first nozzle row and the third nozzle row, the second nozzle row and the fourth nozzle row. The bubble chambers were not allowed to communicate with each other nozzle row. And, since the amount of liquid consumption is likely to be approximately the same between nozzle rows having a relatively large amount of overlap, the bubble chambers are not communicated between nozzle rows having a relatively large amount of overlap, and In addition, by connecting each bubble chamber between nozzle rows that have a relatively small amount of overlap, the amount of bubbles stored in the bubble chamber is reduced and the amount of storage in each bubble chamber is increased. . As a result, it is possible to suppress the stored bubbles from easily closing only a certain filter chamber. Note that the position in the first direction should be such that the amount of the first nozzle row and the second nozzle row overlapping each other is less than the amount of the first nozzle row and the third nozzle row overlapping each other. The one nozzle row and the second nozzle row do not have to overlap each other. Similarly, the third nozzle row and the fourth nozzle row do not have to overlap each other.

  [Aspect 3] In the liquid jet head according to aspect 2, the head main body includes the first nozzle row and the third nozzle row provided in a single nozzle plate, and the second nozzle row It is preferable that the fourth nozzle row is provided on a single nozzle plate. According to this, the distance between the two nozzle rows in the second direction can be narrowed, and the alignment between the two nozzle rows is facilitated.

  [Aspect 4] In the liquid jet head according to Aspect 3, there are a plurality of the head main bodies, and each of the plurality of head main bodies includes a plurality of nozzle rows corresponding to the first communication bubble chamber and the second communication bubbles. It is preferable to have a plurality of nozzle rows corresponding to the chamber. According to this, the nozzle row can be easily elongated in the first direction.

[Aspect 5] In the liquid jet head according to any one of Aspects 2 to 4, the flow path includes a first branch point branched in the middle of the flow path and a second branch branched downstream from the first branch point. Including points,
The first communication bubble chamber corresponds to one filter chamber of the flow path branched at the first branch point, and the second communication bubble chamber is the other filter chamber of the flow path branched at the first branch point. It is preferable to correspond to. According to this, since the bubble chamber of the filter chamber provided in the flow path branched at the downstream branch point can be communicated so that the bubble can move, the arrangement is easy and can contribute to the downsizing. .

[Aspect 6] In the liquid jet head according to any one of aspects 1 to 5, the bubble chambers are two-dimensionally arranged on a plane parallel to the liquid jet surface, and the first branch point is A branch point that branches into the flow path extending to one side of the direction orthogonal to the first direction and the flow path extending to the other side;
The second branch point is preferably a branch point that branches into the flow path extending to one side in the first direction and the flow path extending to the other side. According to this, when the bubble chambers are two-dimensionally arranged, the direction of the flow path branched at the branch point differs for each branch point, so that the flow path member can be reduced in size.

[Aspect 7] A liquid ejecting apparatus including the liquid ejecting head according to any one of aspects 1 to 6.
In such an embodiment, since the bubble chamber is provided for each branched flow path, even if the liquid consumption in each filter chamber varies, the amount of bubbles stored in the bubble chamber is unlikely to vary. Thus, a liquid ejecting apparatus including a flow path member that can prevent a filter chamber from being blocked is realized.

1 is a plan view of an ink jet recording apparatus. 1 is a side view of an ink jet recording apparatus and an enlarged view thereof. FIG. 2 is a perspective view of a recording head according to the present embodiment. FIG. 3 is an exploded perspective view of the recording head according to the first embodiment. FIG. 3 is an exploded perspective view of the recording head according to the first embodiment. FIG. 3 is an exploded perspective view of the recording head according to the first embodiment. FIG. 3 is a plan view of the recording head according to the first embodiment. FIG. 3 is a bottom view of the recording head according to the first embodiment. FIG. 6 is a plan view of the recording head with a cover member removed. FIG. 4 is a plan view of the recording head with a cover member and a flow path member removed. It is the BB 'sectional view taken on the line of FIG.9 and FIG.10. FIG. 10 is a cross-sectional view taken along the line CC ′ of FIGS. 7 to 9. FIG. 10 is a cross-sectional view taken along the line DD ′ of FIGS. 7 to 9. It is a bottom view of a holder member. It is a bottom view of a cover member. It is a disassembled perspective view of a flow path member. It is the FF 'sectional view taken on the line of FIG. It is the G sectional view taken on the line of FIG. It is the H sectional view taken on the line of FIG. It is the side view and top view which show arrangement | positioning with a 1st correction board and a circuit board. 6 is an exploded perspective view of a flow path member according to Embodiment 2. FIG. It is the II 'sectional view taken on the line of FIG. It is the JJ 'sectional view taken on the line of FIG. It is a disassembled perspective view of a head main body. FIG. 4 is a plan view of the liquid ejection surface side of the head body. It is the KK 'sectional view taken on the line of FIG. FIG. 3 is a schematic diagram illustrating a relationship between a flow path member and a nozzle row in the first embodiment. It is a schematic diagram which shows the relationship between the flow-path member and nozzle row of a modification. It is a schematic diagram which shows the relationship between the flow-path member and nozzle row of a modification. It is a schematic diagram which shows the relationship between the flow-path member and nozzle row of a modification.

<Embodiment 1>
The present invention will be described in detail based on embodiments. An ink jet recording head is an example of a liquid jet head, and is also simply referred to as a recording head. An ink jet recording apparatus is an example of a liquid ejecting apparatus. FIG. 1 is a plan view schematically showing the ink jet recording apparatus according to the first embodiment, and FIG. 2 is a side view and an enlarged view of the ink jet recording apparatus.

  The ink jet recording apparatus 1 is a so-called line type ink jet recording apparatus 1 that performs printing only by transporting a recording sheet S that is an ejection target medium.

  The conveyance direction of the recording sheet S is referred to as a second direction Y, and the direction perpendicular to the second direction Y in the in-plane direction of the landing surface S1 on which the ink of the recording sheet S lands is referred to as a first direction X. A direction orthogonal to both the first direction X and the second direction Y, that is, a direction orthogonal to the landing surface S1 of the recording sheet S is referred to as a third direction Z. In the present embodiment, the directions (X, Y, Z) are orthogonal to each other, but the present invention is not necessarily limited thereto.

  The ink jet recording apparatus 1 includes a recording head 2, a carriage 3 on which the recording head 2 is mounted, a liquid storage unit 4 such as an ink tank that stores ink, a first transport unit 5, and a second transport unit 6. The apparatus main body 7 and the maintenance means 400 are provided.

  The recording head 2 extends along the first direction X. In the present embodiment, as will be described in detail later, the recording head 2 includes a head body group 202 in which a plurality of head bodies 200 (see FIG. 8) are arranged in parallel along the first direction X in the second direction. A plurality of rows are provided for Y, and in this embodiment, two rows are provided. Of course, the number of head main body groups 202 of the head main body 200 is not particularly limited to this, and may be three or more rows. Such a head main body 200 is arranged such that the liquid ejecting surface 20a for ejecting ink is on the Z1 side.

  The liquid storage means 4 is for supplying ink to the recording head 2, and is fixed to the apparatus main body 7 in this embodiment. Ink from the liquid storage means 4 fixed to the apparatus main body 7 is supplied to the recording head 2 via a supply pipe 8 such as a tube. Note that the recording head 2 includes the liquid storage unit 4, for example, the recording head 2 has the liquid storage unit 4 mounted in the third direction Z of the recording head 2, that is, on the side opposite to the recording sheet S. You may make it do.

  The first transport unit 5 is provided on one side of the recording head 2 in the second direction Y, in this embodiment, on the Y1 side. In the present embodiment, in the second direction Y, one side with respect to the recording head 2 is referred to as the Y1 side, and the other side is referred to as the Y2 side.

  The first transport unit 5 includes a first transport roller 501 and a first driven roller 502 that is driven by the first transport roller 501. The first transport roller 501 is provided on the back surface S2 side opposite to the landing surface S1 of the recording sheet S, and is driven by the driving force of the first drive motor 503. The first driven roller 502 is provided on the landing surface S1 side of the recording sheet S, and sandwiches the recording sheet S with the first transport roller 501. Such a first driven roller 502 presses the recording sheet S toward the first conveying roller 501 by an urging member such as a spring (not shown).

  The second transport unit 6 includes a transport belt 601, a second drive motor 602, a second transport roller 603, a second driven roller 604, a tension roller 605, and a roller unit 610.

  The second transport roller 603 is driven by the driving force of the second drive motor 602. The conveyor belt 601 is an endless belt, and is hung on the outer periphery of the second conveyor roller 603 and the second driven roller 604. Such a conveyance belt 601 is provided on the back surface S2 side of the recording sheet S. The tension roller 605 is provided between the second transport roller 603 and the second driven roller 604, contacts the inner peripheral surface of the transport belt 601, and is applied to the transport belt 601 by the biasing force of a biasing member 606 such as a spring. Tension is applied. Thus, the surface of the transport belt 601 that faces the recording head 2 between the second transport roller 603 and the second driven roller 604 is flat.

  The roller unit 610 is provided on the landing surface S1 side of the recording sheet S, and has a plurality of inner rollers and outer head rollers on the landing surface S1 side of the recording sheet S. The roller unit 610 sandwiches the recording sheet S between the head inner roller and the head outer roller and the conveyance belt 601. The roller unit 610 will be described later in detail.

  In such an ink jet recording apparatus 1, while the recording sheet S is conveyed from the Y1 side to the Y2 side in the second direction Y with respect to the recording head 2 by the first conveying unit 5 and the second conveying unit 6, So-called printing is performed in which ink is ejected from each ink jet recording head of the recording head 2 and the ejected ink is landed on the landing surface S1 of the recording sheet S.

  The carriage 3 of the ink jet recording apparatus 1 has a plurality of recording heads 2 and is provided on the carriage shaft 9 so as to be movable in the axial direction. The carriage shaft 9 is arranged so that the axial direction coincides with the first direction X, and the driving force of a driving motor (not shown) is transmitted to the carriage 3 via a gear or a belt, so that the carriage 3 It is moved in the axial direction of the carriage shaft 9. The carriage 3 or the carriage shaft 9 is provided so as to be movable in a direction perpendicular to the landing surface S1, that is, in the third direction Z, with respect to the apparatus main body 7 by lifting means (not shown). In the present embodiment, the movement of the recording head 2 in the direction orthogonal to the landing surface S1 of the recording sheet S during printing is referred to as elevation. That is, in the third direction Z, it is said that the movement of the recording head 2 from the Z1 side, which is the recording sheet S side during printing, to the Z2 side that is separated from the recording sheet S increases. Says that the movement of the recording head 2 from the remote Z2 side to the Z1 side which is the recording sheet S side is lowered.

  Such a carriage 3 is lifted to the Z2 side in the third direction Z from the landing position where the recording head 2 is opposed to the conveying belt 601 and ejects ink to land on the recording sheet S by an elevating means (not shown). Thereafter, by moving in the first direction X that is the axial direction of the carriage shaft 9, the carriage moves to a maintenance position that does not face the recording sheet S or the conveyance belt 601. A maintenance means 400 for maintaining the recording head 2 is provided at the maintenance position. In the present embodiment, in the first direction X, the side where the second conveying means 6 such as the conveying belt 601 inside the apparatus main body 7 is provided is referred to as the X1 side, and the maintenance position where the maintenance means 400 is provided. The side is referred to as the X2 side.

  In this embodiment, the maintenance unit 400 includes a wiping unit 410 having a blade for wiping the liquid ejection surface, and a capping unit 420 having a cap that covers the liquid ejection surface.

  The wiping means 410 is a member that wipes the liquid ejection surface 20 a of each head body 200 of the recording head 2, and is provided in the apparatus body 7 so as to be capable of relative movement along the second direction Y. For the recording head 2 moved to the maintenance position, the wiping means 410 is brought into contact with the liquid ejection surface 20a of the head body 200 and moved in the second direction Y, thereby wiping the liquid ejection surface 20a of the head body 200. be able to.

  The capping unit 420 includes a cap formed of rubber or the like provided for each head main body 200 and a cap holding unit that holds the cap. The cap is provided in such a size as to abut against the liquid ejection surface 20a of each head body 200 and cover all of the plurality of nozzle openings. When the cap covers the liquid ejection surface 20a, a sealed space is formed between them. A suction path (not shown) is provided inside the cap holding part. One end of the suction path communicates with the sealed space, and the other end communicates with a suction device such as a suction pump. Such a capping unit 420 causes the suction device to perform a suction operation in a state where the liquid ejection surface 20a of the head main body 200 is covered with the cap. By such suction operation, the inside of the sealed space formed by the cap becomes negative pressure, and the ink in the flow path is sucked together with foreign matters such as bubbles from the nozzle opening 21. In addition, drying of the ink in the vicinity of the nozzle opening 21 may be suppressed by covering the liquid ejecting surface 20a with a cap during non-printing.

  Note that only the wiping means 410 or the capping means 420 may be provided as the maintenance means 400 at the maintenance position. Furthermore, the mechanism for moving the recording head 2 to the maintenance position or the maintenance position itself may not be provided in the ink jet recording apparatus 1.

  3 is a perspective view of the recording head according to the present embodiment, FIG. 4 is an exploded perspective view of the recording head, FIG. 5 is an exploded perspective view of the recording head, and FIG. 6 is an exploded perspective view of the recording head. is there.

  As shown in the drawing, the recording head 2 described above includes a plurality of head main bodies 200, a holder member 210 that holds the plurality of head main bodies 200 on the Z1 side that is one side in the third direction Z, and the holder member 210. Circuit board 220 fixed to the Z2 side surface in the third direction Z, first correction plate 230 fixed to the Z2 side surface of holder member 210, and fixed to the Z1 side surface of holder member 210 The second straightening plate 280, the flow path member 240 fixed to the Z2 side surface of the holder member 210, and the head main body 200, the circuit board 220, and the first straightening are fixed to the Z2 side surface of the holder member 210. A cover member 250 that accommodates the plate 230 and the flow path member 240 and a fixing plate 260 that fixes the plurality of head main bodies 200 are provided.

  First, a head main body 200 that ejects ink droplets as an example of droplets will be described with reference to FIGS. 24 is an exploded perspective view of the head main body, FIG. 25 is a plan view of the liquid ejecting surface side of the head main body, and FIG. 26 is a cross-sectional view taken along the line JJ ′ of FIG.

  The head main body 200 includes a plurality of members such as the flow path forming substrate 10, the communication plate 15, the nozzle plate 20, the protective substrate 30, the compliance substrate 45, and the case member 40.

  The flow path forming substrate 10 is provided with a pressure generation chamber 12 partitioned by a plurality of partition walls. The recording head 2 is mounted on the ink jet recording apparatus 1 such that the direction in which the pressure generating chambers 12 of the head main body 200 are arranged in the first direction X. Hereinafter, the juxtaposed direction of the pressure generating chambers 12 is also referred to as a first direction X. The flow path forming substrate 10 includes a plurality of rows in which the pressure generation chambers 12 are arranged in parallel in the first direction X, two rows in the present embodiment, and a second direction Y orthogonal to the first direction X. Are installed side by side.

For the flow path forming substrate 10, a metal such as stainless steel or Ni, a ceramic material typified by ZrO ₂ or Al ₂ O ₃ , a glass ceramic material, an oxide such as MgO, LaAlO ₃ , or the like can be used. In the present embodiment, the flow path forming substrate 10 is made of a silicon single crystal substrate. This flow path forming substrate 10 is anisotropically etched from one side so that the pressure generating chambers 12 partitioned by the plurality of partition walls are arranged in parallel with a plurality of nozzle openings 21 through which ink is ejected. Side by side.

  On the Z1 side in the third direction Z of the flow path forming substrate 10, the communication plate 15 and the nozzle plate 20 are sequentially stacked. That is, the communication plate 15 provided on the surface on the Z1 side in the third direction Z of the flow path forming substrate 10 and the opposite surface side of the communication plate 15 to the flow path forming substrate 10, that is, the Z1 side of the communication plate 15. And a nozzle plate 20 having nozzle openings 21 provided on the surface.

  The communication plate 15 is provided with a nozzle communication path 16 that communicates the pressure generation chamber 12 and the nozzle opening 21. The communication plate 15 has a larger area than the flow path forming substrate 10, and the nozzle plate 20 has a smaller area than the flow path forming substrate 10. By providing the communication plate 15 in this manner, the nozzle opening 21 of the nozzle plate 20 and the pressure generating chamber 12 can be separated from each other, so that the ink in the pressure generating chamber 12 is contained in the ink generated by the ink near the nozzle opening 21. Less susceptible to thickening due to moisture evaporation. Further, since the nozzle plate 20 only needs to cover the opening of the nozzle communication path 16 that communicates the pressure generating chamber 12 and the nozzle opening 21, the area of the nozzle plate 20 can be made relatively small, and the cost can be reduced. be able to.

  Further, the communication plate 15 is provided with a first manifold portion 17 that constitutes a part of the manifold 100 and a second manifold portion 18 (throttle channel, orifice channel).

  The first manifold portion 17 is provided through the communication plate 15 in the thickness direction. The thickness direction here is a third direction Z in which the communication plate 15 and the flow path forming substrate 10 are laminated. The second manifold portion 18 is provided to open to the nozzle plate 20 side of the communication plate 15 without penetrating the communication plate 15 in the thickness direction.

  In the communication plate 15, a supply communication path 19 that communicates with one end portion in the second direction Y of the pressure generation chamber 12 is provided independently for each pressure generation chamber 12. The supply communication path 19 communicates the second manifold portion 18 and the pressure generation chamber 12.

  As the communication plate 15, a metal such as stainless steel or nickel (Ni), or a ceramic such as zirconium (Zr) can be used. The communication plate 15 is preferably made of a material having the same linear expansion coefficient as the flow path forming substrate 10. That is, when a material having a linear expansion coefficient significantly different from that of the flow path forming substrate 10 is used as the communication plate 15, the flow path forming substrate 10 and the communication plate 15 are warped by being heated or cooled. In this embodiment, by using the same material as the flow path forming substrate 10 as the communication plate 15, that is, a silicon single crystal substrate, it is possible to suppress the occurrence of warping due to heat, cracking due to heat, peeling, and the like.

  In the nozzle plate 20, nozzle openings 21 communicating with the pressure generation chambers 12 through the nozzle communication passages 16 are formed. Such nozzle openings 21 are arranged in parallel in the first direction X, and two rows of nozzle openings 21 arranged in parallel in the first direction X are formed in the second direction Y. Also, the surface of the nozzle plate 20 that ejects ink droplets, that is, the surface opposite to the pressure generation chamber 12 is referred to as a liquid ejection surface 20a.

  As such a nozzle plate 20, for example, a metal such as stainless steel (SUS), an organic material such as a polyimide resin, a silicon single crystal substrate, or the like can be used. In addition, by using a silicon single crystal substrate as the nozzle plate 20, the linear expansion coefficients of the nozzle plate 20 and the communication plate 15 are made equal, and the occurrence of warpage due to heating or cooling, cracks due to heat, peeling, and the like are suppressed. can do.

  On the other hand, a diaphragm 50 is formed on the surface of the flow path forming substrate 10 opposite to the communication plate 15. In the present embodiment, an elastic film 51 made of silicon oxide provided on the flow path forming substrate 10 side and an insulator film 52 made of zirconium oxide provided on the elastic film 51 are provided as the diaphragm 50. I made it. The liquid flow path such as the pressure generation chamber 12 is formed by anisotropically etching the flow path forming substrate 10 from one side (the side where the nozzle plate 20 is bonded). The other surface of the liquid flow path is defined by the elastic film 51.

  On the diaphragm 50 of the flow path forming substrate 10, a piezoelectric actuator 130 having a first electrode 60, a piezoelectric layer 70, and a second electrode 80, which is a pressure generating unit of this embodiment, is provided. Here, the piezoelectric actuator 130 refers to a portion including the first electrode 60, the piezoelectric layer 70, and the second electrode 80. In general, one of the electrodes of the piezoelectric actuator 130 is used as a common electrode, and the other electrode is patterned for each pressure generating chamber 12. In the present embodiment, the first electrode 60 is continuously provided across the plurality of piezoelectric actuators 130 to be a common electrode, and the second electrode 80 is independently provided for each piezoelectric actuator 130 to be an individual electrode. Of course, there is no problem even if it is reversed for the convenience of the drive circuit and wiring. In the above-described example, the diaphragm 50 includes the elastic film 51 and the insulator film 52. However, the present invention is not limited to this. For example, the vibration film 50 includes the elastic film 51 and the insulating film. Any one of the body films 52 may be provided, and the elastic film 51 and the insulator film 52 are not provided as the vibration plate 50, and only the first electrode 60 acts as the vibration plate. Also good. Further, the piezoelectric actuator 130 itself may substantially double as a diaphragm.

The piezoelectric layer 70 is made of an oxide piezoelectric material having a polarization structure. For example, the piezoelectric layer 70 can be made of a perovskite oxide represented by the general formula ABO ₃ , and can be made of a lead-based piezoelectric material containing lead or non-lead. A lead-based piezoelectric material or the like can be used.

  Each second electrode 80 that is an individual electrode of the piezoelectric actuator 130 is drawn from the vicinity of the end opposite to the supply communication path 19 and extends to the diaphragm 50. For example, gold ( One end of each lead electrode 90 made of Au) or the like is connected.

  Further, a wiring substrate 121 provided with a drive circuit 120 for driving the piezoelectric actuator 130 is connected to the other end of the lead electrode 90. As the wiring substrate 121, a flexible sheet-like substrate such as a COF substrate can be used. Note that the driver circuit 120 is not necessarily provided on the wiring board 121. That is, the wiring board 121 is not limited to the COF board, and may be FFC, FPC, or the like.

  A protective substrate 30 having substantially the same size as the flow path forming substrate 10 is bonded to the surface of the flow path forming substrate 10 on the piezoelectric actuator 130 side. The protective substrate 30 has a holding portion 31 that is a space for protecting the piezoelectric actuator 130. The holding unit 31 has a concave shape that opens to the flow path forming substrate 10 side without penetrating the protective substrate 30 in the third direction Z that is the thickness direction. In addition, the holding unit 31 is provided independently for each row constituted by a plurality of piezoelectric actuators 130 arranged in parallel in the first direction X. That is, the holding unit 31 is provided so as to accommodate the rows of the piezoelectric actuators 130 arranged in parallel in the first direction X, and each row of the piezoelectric actuators 130, that is, two in parallel in the second direction Y. Has been. Such a holding part 31 should just have the space of the grade which does not inhibit the motion of the piezoelectric actuator 130, and the said space may be sealed or may not be sealed.

  The protective substrate 30 has a through hole 32 penetrating in the third direction Z, which is the thickness direction. The through-hole 32 is provided across the first direction X, which is the direction in which the plurality of piezoelectric actuators 130 are arranged, between the two holding portions 31 arranged in parallel in the second direction Y. That is, the through hole 32 is an opening having a long side in the direction in which the plurality of piezoelectric actuators 130 are arranged. The other end of the lead electrode 90 extends so as to be exposed in the through hole 32, and the lead electrode 90 and the wiring substrate 121 are electrically connected in the through hole 32.

  As such a protective substrate 30, it is preferable to use substantially the same material as the coefficient of thermal expansion of the flow path forming substrate 10, for example, glass, ceramic material, etc. In this embodiment, the same material as the flow path forming substrate 10 is used. The silicon single crystal substrate was used. Moreover, the joining method of the flow path forming substrate 10 and the protective substrate 30 is not particularly limited. For example, in the present embodiment, the flow path forming substrate 10 and the protective substrate 30 are joined via an adhesive (not shown). Has been.

  The case member 40 has substantially the same shape as the communication plate 15 described above in a plan view, and is bonded to the protective substrate 30 and is also bonded to the communication plate 15 described above. Specifically, the case member 40 has a recess 41 having a depth in which the flow path forming substrate 10 and the protective substrate 30 are accommodated on the protective substrate 30 side. The concave portion 41 has an opening area larger than the surface of the protective substrate 30 bonded to the flow path forming substrate 10. The opening surface on the nozzle plate 20 side of the recess 41 is sealed by the communication plate 15 in a state where the flow path forming substrate 10 and the like are accommodated in the recess 41. Thus, the third manifold portion 42 is defined by the case member 40 on the outer peripheral portion of the flow path forming substrate 10. The first manifold portion 17 and the second manifold portion 18 provided on the communication plate 15 and the third manifold portion 42 defined by the case member 40 constitute the manifold 100 of the present embodiment. That is, the manifold 100 includes the first manifold portion 17, the second manifold portion 18, and the third manifold portion 42.

  The manifold 100 of the present embodiment is disposed on both outer sides of the two rows of pressure generating chambers 12 in the second direction Y, and the two manifolds 100 provided on both outer sides of the two rows of pressure generating chambers 12 are The head main body 200 is provided independently so as not to communicate with each other. That is, one manifold 100 is provided in communication with each row of the pressure generation chambers 12 of the present embodiment. In other words, the manifold 100 is provided for each nozzle row. Of course, the two manifolds 100 may communicate with each other.

  The case member 40 also has an introduction port 44 that communicates with the manifold 100. Ink is introduced into the manifold 100 from the inlet 44. Although the details will be described later, the introduction port 44 communicates with the first connection channel 213 and the second connection channel 214 formed in the holder member 210, and the first connection channel 213 and the second connection channel Ink is supplied from the passage 214 to the introduction port 44.

  The case member 40 is provided with a connection port 43 that communicates with the through hole 32 of the protective substrate 30 and through which the wiring substrate 121 is inserted. Although details will be described later, the connection port 43 is connected to a first wiring insertion hole 212 formed in the holder member 210 and a second wiring insertion hole 282 formed in the second correction plate 280 that reinforces the holder member 210. Communicate. That is, the connection port 43, the first wiring insertion hole 212, and the second wiring insertion hole 282 communicate with each other to form one insertion hole, and the wiring board 121 is inserted through the insertion hole.

  As a material of the case member 40, for example, resin or metal can be used. Incidentally, the case member 40 can be mass-produced at low cost by molding a resin material.

  A compliance substrate 45 is provided on the surface of the communication plate 15 where the first manifold portion 17 and the second manifold portion 18 open. The compliance substrate 45 has substantially the same size as the communication plate 15 described above in plan view, and is provided with a first exposure opening 45a that exposes the nozzle plate 20. The compliance substrate 45 seals the opening on the liquid ejection surface 20a side of the first manifold portion 17 and the second manifold portion 18 in a state where the nozzle plate 20 is exposed by the first exposed opening portion 45a. That is, the compliance substrate 45 defines a part of the manifold 100.

  The compliance substrate 45 according to this embodiment includes a sealing film 46 and a fixed substrate 47. The sealing film 46 is made of a flexible film-like thin film (for example, a thin film having a thickness of 20 μm or less formed of polyphenylene sulfide (PPS) or the like), and the fixed substrate 47 is made of stainless steel (SUS) or the like. It is made of a hard material such as metal. Since the region of the fixed substrate 47 facing the manifold 100 is an opening 48 that is completely removed in the thickness direction, one surface of the manifold 100 is sealed only with a flexible sealing film 46. The compliance portion 49 is a flexible portion. In the present embodiment, one compliance portion 49 is provided corresponding to one manifold 100. That is, in this embodiment, since the two manifolds 100 are provided, the two compliance portions 49 are provided on both sides in the second direction Y with the nozzle plate 20 interposed therebetween.

  In the head main body 200 having such a configuration, when ink is ejected, the ink is taken in through the introduction port 44, and the inside of the flow path is filled with ink from the manifold 100 to the nozzle opening 21. Thereafter, according to a signal from the drive circuit 120, a voltage is applied to each piezoelectric actuator 130 corresponding to the pressure generating chamber 12, so that the diaphragm 50 is flexibly deformed together with the piezoelectric actuator 130. As a result, the pressure in the pressure generating chamber 12 is increased and ink droplets are ejected from the predetermined nozzle openings 21.

  The head main body 200 described above is held by the recording head 2. Here, the recording head 2 will be described with reference to FIGS. 3 to 6 and FIGS. 7 is a plan view of the recording head, FIG. 8 is a bottom view of the recording head, FIG. 9 is a plan view with the cover member of the recording head removed, and FIG. 10 is a cover member and a flow path member of the recording head. 11 is a cross-sectional view taken along the line BB ′ of FIGS. 9 and 10, and FIG. 12 is a cross-sectional view taken along the second direction Y of FIG. FIG. 13 is a cross-sectional view taken along the line DD ′ of FIGS. 7 to 9 along the second direction Y, and FIG. 14A is a holder to which the second correction plate is fixed. 14 is a bottom view of the member, FIG. 14B is a bottom view of the holder member, and FIG. 15 is a bottom view of the cover member. 7, 9, and 10 are planes on the Z2 side in the third direction Z, and bottom surfaces in FIGS. 8, 14, and 15 are planes on the Z1 side in the third direction Z. is there.

  As shown in FIGS. 5, 6, and 8, in the present embodiment, four head bodies 200 are arranged in a staggered manner along the first direction X in one recording head 2. Specifically, the first head body group 202A arranged with a first interval 203A in the first direction X, and the second head arranged with a second interval 203B in the first direction X. And a main body group 202B. Each head body 200 is held so that the direction in which the nozzle openings 21 are arranged is the first direction X of the recording head 2.

  The head body group 202 provided on the Y1 side is referred to as a first head body group 202A, and the head body group 202 provided on the Y2 side is referred to as a second head body group 202B. In addition, the head body 200 on the X1 side of the first head body group 202A is referred to as a head body 200A1, and the head body 200 on the X2 side is referred to as a head body 200A2. The head body 200 on the X1 side of the second head body group 202B is referred to as a head body 200B1, and the head body 200 on the X2 side is referred to as a head body 200B2.

  In each head main body 200, the first head main body group 202A and the second head main body group 202B are arranged at different positions in a second direction Y orthogonal to the first direction X, and the first head main body group 202A. Any one of the head main bodies 200 is disposed at a position where the second interval 203B is provided in the first direction X, and any one of the head main bodies 200 of the second head main body group 202B is provided with the first interval 203A. It is arranged at the position.

  That is, the first head main body group 202A and the second head main body group 202B are arranged to be shifted from each other in the first direction X. The shift amount in the first direction X between the first head main body group 202A and the second head main body group 202B is half the pitch of the head main body 200 constituting the head main body group 202. In the present embodiment, the first head main body group 202A is shifted from the second head main body group 202B toward the X2 side. That is, in the first head main body group 202A, the first interval 203A of the head main bodies 200 adjacent to each other in the first direction X is the head main body 200 constituting the second head main body group 202B, in the present embodiment, the head main body 200B2. Are provided opposite to each other in the second direction Y. In the second head main body group 202B, the second interval 203B of the head main bodies 200 adjacent to each other in the first direction X is the head main body 200 constituting the first head main body group 202A, in the present embodiment, the head main body 200A1. Are provided opposite to each other in the second direction Y. By disposing the first head main body group 202A and the second head main body group 202B in this way, the nozzle openings 21 are continuously arranged in parallel in the first direction X at the same pitch by the four head main bodies 200. be able to.

  As shown in FIGS. 9 to 14, the holder member 210 holds the plurality of head main bodies 200 on the surface facing the recording sheet S, that is, the surface on the Z1 side in the third direction Z. Specifically, a head holding portion 211 having a concave shape opening on the Z1 side is provided on the Z1 side surface of the holder member 210. The head holding part 211 accommodates a second correction plate 280 described later, and further accommodates a plurality of head main bodies 200 fixed by the fixing plate 260. The opening of the head holding part 211 is sealed with a fixing plate 260. That is, the head main body 200 and the second correction plate 280 are accommodated in the inside formed by the head holding portion 211 and the fixed plate 260.

  The head holding portion 211 has a shape that can accommodate the head main bodies 200 arranged so as to constitute the first head main body group 202A and the second head main body group 202B. In the present embodiment, four concave portions each having a rectangular opening slightly larger than each head main body 200 are provided so as to face the positions of the head main bodies 200 constituting the first head main body group 202A and the second head main body group 202B. The head holding part 211 is formed by communicating. In other words, the head holding portion 211 is formed by providing a recess in a region other than the first storage portion 215 and the second storage portion 216 described later on the surface on the Z1 side of the holder member 210 having a substantially rectangular outer shape. Yes.

  Although details will be described later, the holder member 210 is provided with first connection channels 213A and 213B and second connection channels 214A and 214B as an example of the first channel. The first flow path is a flow path provided in the holder member 210 and is a flow path that is supplied with ink from the flow path member 240 and supplies the ink to the head body 200.

  The first connection channel 213 is a channel provided in the holder member 210 so as to be inclined with respect to the third direction Z. In the present embodiment, the holder member 210 includes the first connection flow channel 213A and the first connection flow channel 213B as the first connection flow channel 213 with respect to the X1 side flow channel member 240, the head main body 200A1, and the head main body 200B1. Are provided. Similarly, the holder member 210 includes the first connection flow path 213A and the first connection flow path 213B as the first connection flow path 213 for the X2 side flow path member 240, the head main body 200A2, and the head main body 200B2. One is provided.

  The first connection flow path 213A includes the second supply path 323 of the flow path member 240 (that is, the second supply path 323 on the X2 side of the two) and the head main body 200A1 on the X1 side of the first head main body group 202A. The Y2 side inlet 44 is communicated. The first connection flow path 213B includes the first supply path 313 of the flow path member 240 (that is, the first supply path 313 on the X1 side of the two) and the head main body 200B1 on the X1 side of the second head main body group 202B. The Y1 side inlet 44 is communicated. The same applies to the first connection flow path that connects the X2-side flow path member 240 to the head main body 200A2 and the head main body 200B2.

  In addition, a protrusion 217 that protrudes to the Z1 side in the third direction Z is provided on the bottom surface of the head holding portion 211, and the opening on the Z1 side of the first connection flow paths 213A and 213B is provided on the protrusion 217. Open to the top. The opening on the Z2 side of the first connection channel 213A opens at a position facing a second supply channel 323 of the channel member 240 described later. The opening on the Z2 side of the first connection flow path 213B opens at a position facing a first supply path 313 of the flow path member 240 described later. The same applies to the first connection flow path that connects the X2-side flow path member 240 to the head main body 200A2 and the head main body 200B2.

  The second connection flow channel 214 is a flow channel that extends to the holder member 210 along the third direction Z. In the present embodiment, the holder member 210 includes the second connection channel 214A and the second connection channel 214B as the second connection channel 214 with respect to the channel member 240 on the X1 side, the head body 200A1, and the head body 200B1. Are provided. Similarly, the holder member 210 includes the X2 side flow path member 240, the head main body 200A2, and the head main body 200B2 in the same manner as the second connection flow path 214, the second connection flow path 214A and the second connection flow path 214B. One is provided.

  The second connection flow path 214A includes the first supply path 313 of the flow path member 240 (that is, the first supply path 313 on the X2 side of the two) and the head main body 200A1 on the X1 side of the first head main body group 202A. The Y1 side inlet 44 is communicated. The second connection flow path 214B includes the second supply path 323 of the flow path member 240 (that is, the second supply path 323 on the X1 side of the two) and the head main body 200B1 on the X1 side of the second head main body group 202B. The Y2 side inlet 44 is communicated. The same applies to the second connection flow path that connects the flow path member 240 on the X2 side to the head main body 200A2 and the head main body 200B2.

  Further, the bottom surface of the head holding portion 211 is provided with a protruding portion 217 that protrudes to the Z1 side in the third direction Z, and the opening on the Z1 side of the second connection channels 214A and 214B is formed on the protruding portion 217. Open to the top. The opening on the Z2 side of the second connection flow path 214A is opened at a position facing a first supply path 313 (that is, the first supply path 313 on the X2 side of the two), which will be described later. Yes. The opening on the Z2 side of the second connection flow path 214B opens to a position facing a second supply path 323 (that is, the second supply path 323 on the X1 side of the two) of the flow path member 240 described later. Yes. The same applies to the first connection flow path that connects the X2-side flow path member 240 to the head main body 200A2 and the head main body 200B2.

  Further, the holder member 210 is provided with a first wiring insertion hole 212 that is opened on the bottom surface of the head holding portion 211. The first wiring insertion hole 212 is a wiring insertion hole formed in the member of the holder of the claims. The first wiring insertion hole 212 passes through the head holding portion 211 and the Z2 side of the holder member 210.

  In such a head holding portion 211, a second correction plate 280 is accommodated. The second correction plate 280 is made of a plate-like member fixed to the surface on the Z1 side of the holder member 210, and the surface direction of the liquid ejection surface 20a, that is, the direction including the first direction X and the second direction Y is included. It arrange | positions so that it may become a surface direction. In the present embodiment, it is formed in a shape that can be accommodated in the head holding portion 211, and specifically, an area facing the first accommodation portion 215 and the second accommodation portion 216 in a substantially rectangular plate-shaped member. It is formed by cutting out.

  Further, the second correction plate 280 has a size that covers the liquid ejection surfaces 20a of all the head main bodies 200, that is, the nozzle plates 20, in a plan view with respect to the liquid ejection surface 20a. Such a second correction plate 280 is accommodated and bonded to the head holding portion 211 with an adhesive, for example. Of course, the head holding portion 211 may be fixed to the holder member 210 by a fixing means such as a screw, for example, without using an adhesive, or between the holder member 210 and another member (for example, the head main body 200). It may be fixed to the holder member by being sandwiched between the two.

  The second correction plate 280 is formed with a second wiring insertion hole 282 communicating with the first wiring insertion hole 212 provided in the holder member 210. The first wiring insertion hole 212 and the second wiring insertion hole 282 communicate with each other to form one communication hole. The wiring board 121 of the head main body 200 held in the head holding part 211 is pulled out to the Z2 side of the holder member 210 via the first wiring insertion hole 212 and the second wiring insertion hole 282, and the wiring board 121 is pulled out. The connected end is connected to the circuit board 220.

  The second correction plate 280 is provided with an opening 281 penetrating in the third direction Z. The opening 281 has an opening shape enough to allow the protrusion 217 provided on the holder member 210 to be inserted therethrough. The protrusion 217 inserted through the opening 281 is bonded to the case member 40 of the head main body 200, and the first connection flow path 213 and the second connection flow path 214 opened on the top surface of the protrusion 217 are introduced into the head main body 200. It communicates with the mouth 44.

  As described above, the holder member 210 is provided with the second connection channel 214 extending linearly along the third direction Z. The second correction plate 280 is provided with an opening 281 penetrating in the third direction Z. By inserting the protrusion 217 having the second connection channel 214 opened into the opening 281 along the third direction Z, the second connection channel 214 can be communicated with the introduction port 44 of the head body. According to the opening 281 of the second correction plate having such a configuration, the second correction plate 280 can be easily processed because it may be formed as a through hole along the third direction Z. That is, it is not necessary to incline with respect to the third direction Z like the second connection flow path 214.

  The second correction plate 280 is made of a material having higher rigidity than the holder member 210, for example, a metal plate, and is joined to the holder member 210, whereby the first direction X and the second direction Y of the holder member 210. Correct distortion and twist in the plane including That is, even if distortion or twist occurs during the manufacturing or heating of the holder member 210, the holder member 210 is obtained by joining the second correction plate 280 to the holder member 210 while correcting the distortion or twist of the holder member 210. It is possible to maintain a state in which the distortion and twist of the toner are corrected. Thereby, the flatness of the surface on the Z1 side to which the head main body 200 of the holder member 210 is joined can be improved, and the deviation of the landing position of the ink on the recording sheet S can be suppressed.

  Further, as described above, the second correction plate 280 has a size that covers the nozzle plate 20 that is the liquid ejection surface 20 a of all the head main bodies 200, and is joined to the holder member 210. That is, since the second correction plate 280 is bonded to the holder member 210 that holds all the head main bodies 200, it is possible to more reliably correct distortion and twist at the time of manufacturing. Furthermore, the second correction plate 280 can improve the rigidity of the recording head 2.

  As shown in FIGS. 3, 5, 6, and 8, the opening of the head holding portion 211 is formed on the Z1 side surface of the holder member 210 that holds the second correction plate 280 and the head main body 200 on the head holding portion 211. A fixing plate 260 is provided to cover.

  The fixing plate 260 is a member to which the head main body 200 is fixed. In the present embodiment, the fixed plate 260 is formed by bending a flat plate member, and a nozzle surface forming portion 263 provided on the liquid ejection surface 20a side and a part of the outer edge of the nozzle surface forming portion 263 are formed. And a bent portion 261 provided by being bent on the Z2 side in the third direction Z.

  In addition, a second exposed opening 262 that exposes the liquid ejection surface 20 a of the head body 200 is formed in the nozzle surface forming portion 263 of the fixed plate 260. Four second exposure openings 262 are formed so as to expose the liquid ejection surfaces 20a of the head bodies 200 independently.

  Such a fixing plate 260 is joined to the Z1 side in the third direction Z, which is the side opposite to the communication plate 15 of the compliance substrate 45 of the head body 200. The fixing plate 260 seals the compliance portion 49 and suppresses ink from adhering to the compliance portion 49.

  A portion of the nozzle plate forming portion 263 of the fixing plate 260 facing the holder member 210 and the bent portion 261 are fixed to the holder member 210 by fixing means such as an adhesive or a screw. That is, the plurality of head main bodies 200 are accommodated in the head holding portion 211 of the holder member 210 in a state of being fixed to the fixing plate 260.

  In each head body 200 fixed to the fixing plate 260, the surface on the Z2 side of the case member 40 is bonded to the surface on the Z1 side of the second correction plate 280 with an adhesive. Note that the adhesive also functions as a seal that suppresses ink leakage from the boundary between the introduction port 44 of the case member 40 and the first connection channel 213 and the second connection channel 214 that communicate with the introduction port 44. To do.

  The head main body 200 and the second correction plate 280 may be separated from each other without bonding the head main body 200 to the second correction plate 280.

  When the head main body 200 and the second correction plate 280 are bonded as in the present embodiment, the components disposed between the holder member 210 and the fixing plate 260 are the head main body 200 and the second correction plate 280. These are two types. Therefore, it is necessary to design a dimensional tolerance for the depth in the third direction Z of the head holding portion 211 in which they are accommodated in consideration of two types of the head main body 200 and the second correction plate 280.

  On the other hand, as a configuration in which the head main body 200 and the second correction plate 280 are separated from each other, for example, the head main body 200 is configured such that the introduction port 44 communicates with the first connection flow path 213 and the second connection flow path 214 with Z2 A configuration in which the side surface is bonded to the Z1 side surface of the holder member 210 and the liquid ejection surface 20a side is bonded to the fixing plate 260 can be mentioned. And the 2nd correction board 280 is adhere | attached only on the surface at the side of Z1 of the holder member 210, and the structure which is not adhere | attached on the head main body 200 is mentioned.

  In the recording head 2 having such a configuration, the component disposed between the holder member 210 and the fixed plate 260 is substantially only the head body 200. Therefore, the depth tolerance of the head holding portion 211 in the third direction Z may be designed with a dimensional tolerance in consideration of one type of the head main body 200. As described above, the dimensional tolerance in the third direction Z can be reduced by the amount of the second correction plate 280 that is reduced as a component that directly contacts between the holder member 210 and the fixed plate 260. Miniaturization in the third direction Z can be achieved.

  On the other hand, the circuit board 220, the first correction plate 230, the flow path member 240, and the cover member 250 are fixed to the holder member 210 on the Z2 side surface in the third direction Z.

  As shown in FIGS. 4 and 9 to 13, the circuit board 220 is provided on the both sides of the board 225 along the third direction Z which is a direction perpendicular to the liquid ejection surface 20 a and the board 225. 121 and a connection portion 226 electrically connected to 121. The circuit board 220 is fixed in a standing state on the surface of the holder member 210 on the Z2 side. That is, the circuit board 220 is fixed to the surface on the Z2 side of the holder member 210 in a state where the direction including the first direction X and the third direction Z is a surface direction. The fixing position of the circuit board 220 is substantially the center of the holder member 210 in the second direction Y, and is provided at a position corresponding to between the two rows of head main body groups 202. That is, each head body group 202 is arranged with the circuit board 220 interposed therebetween.

  The circuit board 220 is electrically connected to a flexible wiring board 121 drawn from each head body 200. In the present embodiment, the wiring board 121 of the head body 200 constituting the first head body group 202A provided on the Y1 side of the circuit board 220 in the second direction Y is the first surface 222 of the circuit board 220 on the Y1 side. It is connected to the. Similarly, the wiring board 121 of the head main body 200 constituting the second head main body group 202B provided on the Y2 side in the second direction Y of the circuit board 220 is connected to the second surface 223 of the circuit board 220 on the Y2 side. Has been. That is, the wiring board 121 of each head body 200 is connected to both surfaces of the circuit board 220 without straddling the circuit board 220 in the second direction Y.

  Further, in the present embodiment, as shown in FIG. 10, from the region L1 to which the wiring board 121 drawn from the head body 200 of the first head body group 202A is connected and from the head body 200 of the second head body group 202B. The region L2 to which the drawn wiring board 121 is connected is arranged so that at least a part thereof overlaps in the second direction Y. In this way, since the circuit board 220 and the wiring board 121 are connected on both the first surface 222 and the second surface 223 of the circuit board 220, a part of the head body 200 overlaps in the second direction Y. Even when the regions L1 and L2 connected to the circuit board 220 of the wiring board 121 partially overlap with each other in the second direction Y, the wiring board 121 and the circuit board 220 of the head body 200 can be easily connected. It can be carried out.

  On the other hand, for example, when the wiring boards 121 of all the head main bodies 200 are connected to only one surface of the circuit board 220, the wiring boards 121 interfere with each other. For this reason, in order to prevent the connection parts of the wiring board 121 from interfering with each other, it is necessary to change the part where the wiring board 121 is connected to the circuit board 220 to a different position in the third direction Z. However, the size increases in the third direction Z. In this embodiment, since the wiring board 121 is connected to both surfaces of the circuit board 220, the circuit board 220 can be reduced in size in the third direction Z.

  In addition, a region L1 to which the wiring board 121 drawn from the head main body 200 of the first head main body group 202A is connected, and a region L2 to which the wiring board 121 drawn from the head main body 200 of the second head main body group 202B is connected. The reason is that the wiring substrate 121 having a wide width in the first direction X is used. That is, when the wiring substrate 121 having a narrow width in the first direction X is used, the connection portions of the wiring substrate 121 to the circuit substrate 220 do not overlap with each other in the second direction Y.

  However, since the head body 200 has recently been required to have a large number of nozzles provided with a large number of nozzle openings and a high density of nozzle openings arranged at high density, the head body 200 can be reduced in size as the density of nozzle openings increases. As the number of nozzles increases, the number of wires increases. Therefore, it is difficult to reduce the width of the wiring board 121 in the first direction X. The width of the wiring board 121 in the first direction X is substantially equal to the width of the head body 200 in the first direction X. It becomes almost the same.

  Further, since the wiring boards 121 connected to the first surface 222 and the second surface 223 of the wiring board 121 can be arranged so as to partially overlap each other, the head main bodies 200 adjacent in the first direction X can be arranged. The amount of overlap in the second direction Y can be freely designed. Therefore, it is possible to increase the number of nozzle openings 21 that are in the same position in the second direction Y of the head main bodies 200 adjacent in the first direction X, and the print quality at the joint in the first direction X of the head main body 200 can be increased. Deterioration can be reduced.

  As shown in FIGS. 12 and 13, the regions L1 and L2 to which the wiring substrate 121 of the circuit board 220 is connected are connected to the flow channel 300 of the flow channel member 240 of the holder member 210 in the third direction Z. It is provided on the opposite side to the liquid ejecting surface 20a than the surface to be formed. Thereby, when connecting the wiring board 121 and the circuit board 220 with a heat tool or the like, the wiring board 121 and the circuit board 220 can be easily connected without interfering with the portion to which the flow path 300 of the holder member 210 is connected. And it becomes possible to connect reliably.

  In addition, since the circuit board 220 is erected perpendicular to the liquid ejection surface 20a, the area occupied by the circuit board 220 in the surface direction of the liquid ejection surface 20a can be reduced. Thereby, the recording head 2 can be reduced in size in the surface direction of the liquid ejection surface 20a.

  In the third direction Z, the circuit board 220 is provided with a connector 221 as an example of an electronic component on the opposite side to the holder member 210, that is, on the end portion on the Z2 side. In the present embodiment, the connector 221 of the circuit board 220 extends the circuit board 220 to the Z2 side between the two flow path members 240, and the Y1 side surface and the Y2 side surface of the extended end portion respectively. Is provided. A control unit is connected to such a connector 221 via an external wiring (not shown). As a result, a signal or the like from the control unit is supplied to the circuit board 220 via the connector 221, and is supplied from the circuit board 220 to the head body 200 via the wiring board 121. The cover member 250 is provided with a connector exposure hole 251 for exposing the connector 221 to the outside in a region corresponding to the connector 221, and external wiring is connected to the connector 221 exposed by the connector exposure hole 251. The

  As shown in FIGS. 10 to 13, the first correction plate 230 has a planar shape and is a member for correcting the holder member 210. Specifically, the first correction plate 230 includes a correction main body 231 having a plane including the first direction X and the third direction Z, and an opening provided in the correction main body 231 through which the wiring board 121 is inserted. 233 and leg portions 232 provided on both sides of the opening 233 in the first direction X.

  Such a first correction plate 230 is fixed to the surface on the Z2 side of the holder member 210 and is disposed so as to face each of both surfaces of the circuit board 220. In the present embodiment, a pair of first correction plates 230 are fixed to the Z2 side surface of the holder member 210 with the circuit board 220 interposed therebetween. Two or more sets of the first correction plates 230 may be provided.

  Further, as shown in FIG. 11, the first correction plate 230 straddles the connection portion 226 of the circuit board 220 in the third direction Z that is a direction perpendicular to the liquid ejection surface 20a. Here, the first correction plate 230 straddles the connection portion 226 when the position of the correction main body portion 231 and the leg portion 232 in the third direction Z is at least the third position of the connection portion 226 in the plan view of the circuit board 220. A state in which the position overlaps the position in the direction Z. In other words, a straight line along the third direction Z passes through at least a part of the correction main body part 231 and the leg part 232 and a part of the connection part 226. In the present embodiment, the correction main body 231 overlaps in the third direction Z over the entire width of the connection portion 226 in the first direction X. As described above, the correction main body 231 is formed so that the size straddling the connection portion 226 is the entire width in the first direction X of the connection portion 226, so that the correction of the holder member 210 can be made stronger. it can. The correction body 231 does not necessarily have to straddle the connection part 226 of the circuit board 220.

  In addition, since the opening 233 is provided in the correction body 231, the recording head 2 is smaller in the third direction Z than when the first correction plate 230 without the opening 233 is used. Can be

  By the way, when the first straightening plate having no opening 233 is used, the circuit board 220 is bypassed in the third direction Z so as to bypass the top of the first straightening plate on the Z2 side. Must be joined to part 226. That is, the connection part 226 of the circuit board 220 must be disposed on the Z2 side in the third direction Z with respect to the first correction plate 230, and the size of the circuit board 220 in the third direction Z becomes larger. End up.

  In the present embodiment, since the correction main body portion 231 straddles the connection portion 226, the wiring board 121 can be connected to the connection portion 226 through the opening 233. That is, since the connection part 226 can be formed at a position where at least a part thereof overlaps the correction body part 231, the size of the circuit board in the third direction Z of the circuit board 220 can be reduced. As a result, the recording head 2 can be reduced in size in the third direction Z.

  The first correction plate 230 has an area smaller than that of the circuit board 220 and is arranged at a distance from the circuit board 220 on both sides of the circuit board 220. Further, the first correction plate 230 has an opening 233 through which the wiring board 121 can be inserted at a position facing the connection part 226 connecting the circuit board 220 and the wiring board 121 in the second direction Y. The opening 233 is formed by cutting out in a concave shape from the end on the Z1 side fixed to the holder member 210 of the first correction plate 230 to the middle on the Z2 side. In the present embodiment, the first correction plate 230 has a length shorter than the first direction X of the holder member 210, and the two first correction plates 230 are the first of the holder member 210. It is arranged on the X1 side and the end side of the X2 side in the direction X. Specifically, the first correction plate 230 provided on the Y1 side of the circuit board 220 is provided on the end side on the X1 side with respect to the holder member 210, and the wiring board of the head main body 200A2 on the X2 side. The length does not reach 121. That is, the first correction plate 230 on the Y1 side is provided with only one opening 233 through which the wiring board 121 of the head main body 200A1 is inserted, and the wiring board 121 of the head main body 200A2 on the X2 side has the first correction. The circuit board 220 is connected to the X2 side which is the outside of the plate 230. The first correction plate 230 provided on the Y2 side is provided on the end side on the X2 side with respect to the holder member 210, and is formed with a length that does not reach the head body 200B1 on the X1 side. That is, the first correction plate 230 on the Y2 side is provided with only one opening 233 through which the wiring board 121 of the head main body 200B2 is inserted, and the wiring board 121 of the head main body 200A1 on the X1 side has the first correction. It is connected to the circuit board 220 on the X1 side which is the outside of the plate 230. The first correction plates 230 provided on the Y1 side and the Y2 side are partially provided opposite to each other in the second direction Y at the center of the holder member 210 in the first direction X. Yes. That is, the two first correction plates 230 are provided over substantially the entire first direction X of the holder member 210 so as to overlap in the second direction Y.

  The first correction plate 230 is made of a material having higher rigidity than the holder member 210, such as a metal plate, and corrects the warpage of the holder member 210 in the third direction Z by being joined to the holder member 210. . That is, even when the holder member 210 is warped during manufacturing or heating, the warp of the holder member 210 is corrected by joining the first correction plate 230 to the holder member 210 in a state where the warp of the holder member 210 is corrected. Can be maintained. Thereby, the flatness of the surface on the Z1 side to which the head main body 200 of the holder member 210 is joined is improved, the deviation of the landing position of the ink on the recording sheet S is suppressed, and the recording head 2 with improved ejection quality is obtained. It is done.

  Further, the first correction plate 230 is disposed on both surfaces of the circuit board 220 so as to face the circuit board 220. As a result, the first correction plate 230 not only corrects distortion and torsion during manufacturing, but also contributes to improving the rigidity of the recording head 2.

  As a method of manufacturing the recording head 2 capable of correcting such warpage of the holder member 210, the side on which the fixing plate 260 of the holder member 210 is fixed with respect to the holder member 210 to which the fixing plate 260 is not fixed. The surface on the Z1 side in the third direction Z, which is the surface of the surface, is placed on a member that can ensure flatness, for example, placed on a regular plate, and the first correction plate 230 is pressed against the holder member 210 side. Then, the holder member 210 is fixed. Thereby, the curvature which arose by shaping | molding of a holder member can be corrected.

  As described above, the single first correction plate 230 is not formed with a length over the entire first direction X of the holder member 210 as described above, but the two first correction plates 230 are not formed in the first direction. By displacing each other in the direction X, the two first correction plates 230 can overlap each other in the second direction Y, and can be formed over substantially the entire first direction X of the holder member 210. The warp of the member 210 can be corrected effectively. Incidentally, although it is conceivable that the length of one first correction plate 230 is formed over substantially the entire first direction X of the holder member 210, an opening through which the wiring substrate 121 is inserted into the first correction plate 230. Two parts 233 are required, and an extra region for forming the opening 233 is required, and the holder member 210 is increased in size in the first direction X. In the present embodiment, by providing one opening 233 for each of the two first correction plates 230, an extra area is not necessary for the first correction plate 230, and the holder member 210 is moved in the first direction X. It can be downsized.

  As shown in FIG. 10, the circuit board 220 includes the connector 221 as an example of an electronic component as described above. The width that is the dimension of the connector 221 in the direction in which the pair of first correction plates 230 face each other, that is, in the second direction Y is defined as W1. In the second direction Y, the interval between the circuit board 220 and the first correction plate 230 is W2.

  The width W1 of the connector 221 is larger than the interval W2 between the circuit board 220 and the first correction plate 230. And as shown in FIG. 11, the connector 221 is arrange | positioned in the position which the 1st correction board 230 does not oppose among the circuit boards 220. FIG. In other words, the connector 221 is disposed on the circuit board 220 at a position that does not overlap the first correction plate 230 in plan view with respect to the circuit board 220. In the present embodiment, in the third direction Z, the connector 221 is disposed on the Z2 side with respect to the first correction plate 230.

  Thus, even when the width W1 of the connector 221 is larger than the interval W2, the first correction plate 230 is shorter than the width W1 by disposing the connector 221 on the Z2 side with respect to the first correction plate 230. The circuit board 220 can be arranged close to the gap W2. In other words, it is not necessary to separate the first correction plate 230 from the circuit board 220 in the second direction Y so as not to interfere with the connector 221 in the second direction Y. Therefore, the recording head 2 can be reduced in size in the second direction Y.

  Examples of electronic components include a capacitor, a transistor, an integrated circuit, and the like in addition to the connector 221 described above. Further, the dimensions of the connector 221 and the distance between the circuit board 220 and the first correction plate 230 are not limited to those described above.

  As described above, the circuit board 220 and the first correction plate 230 are fixed in a standing state on the surface of the holder member 210 on the Z2 side. Specifically, as shown in FIGS. 4 and 12, the circuit board fixing portion 275 and the first correction plate 230 are inserted into the Z2 side surface of the holder member 210 as a recess through which the circuit board 220 is inserted. A correction plate fixing portion 276 is provided as a recess.

  The circuit board fixing portion 275 is formed in a long shape along the first direction X, and has a width substantially the same as the width in the first direction X of the circuit board 220. In addition, the circuit board fixing portion 275 is located in the approximate center of the holder member 210 in the second direction Y.

  The end of the circuit board fixing part 275 on the Z1 side in the third direction Z is inserted into the circuit board fixing part 275. By inserting the circuit board 220 into the circuit board fixing portion 275, the circuit board 220 is fixed to the holder member 210 in a state where the circuit board 220 stands up along the third direction Z.

  The correction plate fixing portion 276 is formed in an elongated shape along the first direction X, and has a width substantially the same as the width of the leg portion 232 of the first correction plate 230 in the first direction X. In the present embodiment, since there are two leg portions 232 of the first correction plate 230, two correction plate fixing portions 276 are arranged along the first direction X for one first correction plate 230. . The two correction plate fixing portions 276 arranged in parallel in the first direction X are provided on both sides in the second direction Y with the circuit board fixing portion 275 interposed therebetween.

  The end of the leg portion 232 on the Z1 side in the third direction Z is inserted into the correction plate fixing portion 276. By inserting the leg portion 232 into the correction plate fixing portion 276, the first correction plate 230 is fixed to the holder member 210 in a state where the first correction plate 230 stands up along the third direction Z. Note that the depth of the correction plate fixing portion 276 is such that the opening 233 opens on the Z2 side surface of the holder member 210 in a state where the leg portion 232 is inserted into the correction plate fixing portion 276, and the wiring board 121 can be inserted. It is said to be about.

  The first correction plate 230 and the circuit board 220 are fixed to the holder member 210 along the first connection flow path 213 inclined with respect to the third direction Z.

  That is, as shown in FIG. 12, in a plan view including the second direction Y and the third direction Z, which are the directions in which the first connection flow path 213 extends, the first connection flow path 213 The distance from the Z1 side surface of the holder member 210 becomes longer as it goes from the outside in the direction Y to the center. On the other hand, the circuit board 220 positioned closer to the center than the first correction plate 230 in the second direction Y is inserted into the circuit board fixing portion 275 of the holder member 210 deeper on the Z1 side than the first correction plate 230. .

  By providing the inclined first connection channel 213 in the holder member 210, an area where the circuit board fixing part 275 can be formed is larger than the correction plate fixing part 276 in the central portion in the second direction Y. can do. In other words, the circuit board fixing part 275 can be easily formed without interfering with the first connection flow path 213.

  Thereby, the circuit board fixing | fixed part 275 can be formed deeper than the correction board fixing | fixed part 276, and the circuit board 220 can be inserted deeply. Thereby, the connection part 226 of the circuit board 220 can be brought closer to the Z1 side, and the wiring board 121 connected to the connection part 226 can be shortened. In particular, when the wiring board 121 is formed as a flexible cable, it is expensive, but the wiring board 121 can be shortened, so that the cost related to the wiring board 121 can be reduced. Of course, the first correction plate 230 and the circuit board 220 may not be formed on the holder member 210 along the first connection flow path 213.

  As shown in FIGS. 9 and 11 to 13, the flow path member 240 supplies the ink introduced from the liquid storage means 4 to the head main body 200 and is an example of the second flow path inside. A flow path 300 is provided.

  One flow path member 240 of this embodiment is provided for each of the two head main bodies 200 that are adjacent in the second direction Y. That is, the flow path member 240 common to the X1 side head main body 200 of the first head main body group 202A and the X1 side head main body 200 of the second head main body group 202B, and the X2 side head of the first head main body group 202A. Two of the main body 200 and the flow path member 240 common to the head main body 200 on the X2 side of the second head main body group 202B are provided.

  The flow path member 240 is disposed on both sides of the circuit board 220 across the circuit board 220 in the second direction Y. In the present embodiment, the flow path member 240 is continuously provided so as to straddle the circuit board 220 and the two first correction plates 230 in the second direction Y. Specifically, the flow path member 240 has substantially the same width as the width of the holder member 210 in the second direction Y, and a concave portion 241 that opens to the surface on the Z1 side is formed at the center of the second direction Y. Is formed. The concave portion 241 has a width that allows the circuit board 220 and the two first correction plates 230 to be inserted. In the third direction Z, the concave portion 241 extends from the Z2 side surface of the holder member 210 to the Z2 side end of the circuit board 220 (connector 221). It is formed deeper than the height up to (except for the portion provided with). Accordingly, by inserting the circuit board 220 and the two first correction plates 230 into the recess 241 of the flow path member 240, Z2 of the holder member 210 is formed on both sides of the circuit board 220 and the two first correction plates 230. Can be fixed to the side surface.

  A flow path 300 is provided inside the flow path member 240. The flow path 300 includes an introduction path 301 to which the supply pipe 8 (see FIG. 1) is connected, a first liquid flow path 310 that is branched into two from the introduction path 301 and provided on the Y1 side of the circuit board 220, And a second liquid channel 320 provided on the Y2 side of the circuit board 220.

  The introduction path 301 is provided to open at the tip of a supply needle 242 provided to project from the Z2 side surface of the flow path member 240 in the third direction Z. The supply needle 242 is a part having a needle shape extending along the direction intersecting the liquid ejection surface 20a. In the present embodiment, the supply needle 242 is along the third direction Z orthogonal to the liquid ejection surface 20a. By providing the supply needle 242 so as to intersect the liquid ejecting surface 20a in this way, the size of the liquid ejecting surface 20a in the in-plane direction can be reduced. Here, the in-plane direction refers to only the first direction X including the liquid ejection surface 20a, only the second direction Y, or any direction obtained by combining the first direction X and the second direction Y. .

  The cover member 250 is provided with an exposed portion 290 that exposes the supply needle 242 to the outside of the cover member 250. By connecting the supply pipe 8 to the supply needle 242 exposed from the exposed portion 290, the supply pipe 8 and the introduction path 301 communicate with each other. Details of the exposed portion 290 will be described later.

  The first liquid channel 310 and the second liquid channel 320 are provided so as to communicate with the two inlets 44 provided in each of the head main bodies 200. Specifically, the first liquid channel 310 communicates with the first communication channel 311 that communicates with the introduction channel 301, the first liquid reservoir 312 that communicates with the first communication channel 311, and the first liquid reservoir 312. And two first supply paths 313.

  A part of the first communication path 311 and the first liquid reservoir 312 are provided on the side surface of the flow path member 240, that is, on the surface opposite to the circuit board 220 and on the surface on the Y1 side. It is provided in the concave shape part. The concave portion is surrounded by the outer wall portion 245, and the opening portion of the first liquid reservoir portion 312 is sealed by welding the film 243, which is a fixing member, to the outer wall portion 245.

  As will be described in detail later, the first liquid reservoir 312 is provided with two filters 244 arranged in the first direction X for removing foreign substances such as dust and bubbles, and the first communication path. The ink that has flowed into the first liquid reservoir 312 from 311 passes through the two filters 244 and is supplied from the first liquid reservoir 312 to the two first supply paths 313. That is, the first liquid reservoir 312 is a filter chamber that houses the filter 244, and the upstream side is referred to as the upstream filter chamber 3121 and the downstream side is referred to as the downstream filter chamber 3122.

  Of the two flow path members 240, the first liquid reservoir portion 312 of the flow path member 240 on the X 1 side in the first direction X is the X 1 side of the first head body group 202 A arranged in parallel in the first direction X. The head body 200A1 extends in the first direction X so as to straddle the head body 200B1 on the X1 side of the second head body group 202B. Two first supply paths 313 are arranged side by side in the first direction X, and the two first supply paths 313 are open on the Z1 side surface of the flow path member 240. Here, the first supply paths 313a and 313b are also referred to. One first supply path 313a is connected to the introduction port 44 on the Y1 side of the head main body 200A1 via the second connection flow path 214A. The other first supply path 313b is connected to the introduction port 44 on the Y1 side of the head body 200B1 via a first connection flow path 213B formed in the holder member 210.

  The second liquid channel 320 includes a second communication path 321 that communicates with the introduction path 301, a second liquid reservoir portion 322 that communicates with the second communication passage 321, and two second fluid channels 322 that communicate with the second liquid reservoir portion 322. A supply path 323.

  A part of the second communication path 321 and the second liquid reservoir 322 are provided on the side surface of the flow path member 240, that is, the surface opposite to the circuit board 220 and opened on the Y2 side surface. It is provided in the concave shape part. The concave portion is surrounded by the outer wall portion 245, and the opening portion of the second liquid reservoir portion 322 is sealed by the film 243 on the outer wall portion 245.

  As will be described in detail later, the second liquid reservoir 322 is provided with two filters 244 arranged in the first direction X for removing foreign substances such as dust and bubbles, and the second communication path. The ink that has flowed into the second liquid reservoir 322 from 321 passes through the two filters 244 and is supplied from the second liquid reservoir 322 to the two second supply paths 323. That is, the second liquid reservoir 322 is a filter chamber that houses the filter 244, and the upstream side is referred to as the upstream filter chamber 3221 and the downstream side is referred to as the downstream filter chamber 3222.

  Of the two flow path members 240, the second liquid reservoir portion 322 of the flow path member 240 on the X 1 side in the first direction X is the X 1 side of the first head main body group 202 A arranged in parallel in the first direction X. The head body 200A1 extends in the first direction X so as to straddle the head body 200B1 on the X1 side of the second head body group 202B. Two second supply paths 323 are arranged in parallel in the first direction X, and the two second supply paths 323 are open on the Z1 side surface of the flow path member 240. Here, the first supply paths 313a and 313b are also referred to. One second supply path 323a is connected to the introduction port 44 on the Y2 side of the head main body 200A1 via the first connection flow path 213A. The other second supply path 323b is connected to the introduction port 44 on the Y2 side of the head main body 200B1 via a second connection flow path 214B formed in the holder member 210.

  Of the two flow path members 240, the flow path member 240 on the X2 side in the first direction X has the same configuration. That is, the flow path member 240 includes a first supply path 313a that communicates with the Y1 side introduction port 44 of the head body 200A2, a first supply path 313b that communicates with the Y2 side introduction port 44 of the head body 200B2, and the head body 200A2. A second supply path 323a that communicates with the Y2 side introduction port 44 and a second supply path 323b that communicates with the Y2 side introduction port 44 of the head body 200B2.

  The holder member 210 is provided with a first connection channel 213 and a second connection channel 214 which are examples of a first channel for one head body 200. In the present embodiment, since the four head bodies 200 are fixed to the holder member 210, a total of eight first connection channels 213 and second connection channels 214 are provided.

  Specifically, the second connection flow path 214A that communicates with the Y1 side introduction port 44 of the head body 200A1 on the X1 side of the first head body group 202A is in the third direction Z on the Y1 side of the circuit board 220. It extends in a straight line along and communicates with the first supply path 313a. Further, the first connection flow path 213A communicating with the Y2 side introduction port 44 of the head main body 200A1 extends in a straight line along a direction inclined with respect to the third direction Z. The opening on the Z2 side serving as the ink inlet of the first connection channel 213A is on the Y2 side in the second direction Y from the circuit board 220, and the opening on the Z1 side serving as the ink outlet is closer to the circuit board 220. It is on the Y1 side in the second direction Y. That is, the first connection flow path 213A is provided to be inclined from the Y2 side connected to the second supply path 323a with respect to the circuit board 220 toward the Y1 side of the circuit board 220 provided with the head main body 200A1. Yes. Accordingly, the second supply path 323a provided on the Y2 side of the circuit board 220 and the introduction port 44 on the Y2 side of the head main body 200A1 provided on the Y1 side are easily connected via the first connection flow path 213A. can do. The first connection channel 213A of the present embodiment is provided to be inclined with respect to the third direction Z. However, the first connection channel 213A is not particularly limited to this, for example, You may make it comprise with the vertical flow path provided along the direction Z of 3 and the horizontal flow path provided along the 2nd direction Y. However, by providing the inclined first connection flow path 213A as in the present embodiment, the holder member 210 can be formed by one component by molding, and the number of parts is reduced compared to the case of providing a horizontal flow path or the like. The cost can be reduced.

  Similarly, the second connection flow path 214B communicating with the Y2 side introduction port 44 of the head body 200B1 on the X1 side of the second head body group 202B extends along the third direction Z on the Y2 side of the circuit board 220. It extends in a straight line and communicates with the second supply path 323. Further, the first connection channel 213B communicating with the Y1 side introduction port 44 of the head main body 200B1 extends in a straight line along a direction inclined with respect to the third direction Z. The Z2 side opening serving as the ink inlet of the first connection channel 213B is located on the Y1 side in the second direction Y from the circuit board 220, and the Z1 side opening serving as the ink outlet is located from the circuit board 220. It is on the Y2 side in the second direction Y. That is, the first connection flow path 213B is provided to be inclined from the Y1 side connected to the first supply path 313b with respect to the circuit board 220 toward the Y2 side of the circuit board 220 provided with the head main body 200B1. Yes. Thus, the first supply path 313b provided on the Y1 side of the circuit board 220 and the introduction port 44 on the Y1 side of the head main body 200B1 provided on the Y2 side are easily connected via the first connection flow path 213B. can do. In addition, although the 1st connection flow path 213B of this embodiment is inclined and provided with respect to the 3rd direction Z, similarly to the 1st connection flow path 213A, for example, the 3rd direction Z A vertical flow path provided along the horizontal direction Y and a horizontal flow path provided along the second direction Y may be used.

  The above-mentioned flow path member is also used for the flow path member 240 provided corresponding to the head main body 200A2 on the X2 side of the first head main body group 202A and the head main body 200B2 on the X2 side of the second head main body group 202B. Since it is the same structure as 240, the overlapping description is abbreviate | omitted.

  As described above, the first connection flow path 213 and the second connection flow path 214 connected to one head main body 200 are portions of the portion connected to the head main body 200 in the second direction Y that is the transport direction. The width is narrower than the width of the portion connected to the flow path 300. That is, the interval between the two nozzle rows arranged in parallel in the second direction Y can be narrowed, and the landing position deviation of the ink ejected from the two nozzle rows hardly occurs.

  In addition, as shown in FIGS. 11 and 12, in the present embodiment, the two first connection flow paths 213 connected to the head main body 200A1 and the head main body 200B1 are mutually connected when viewed from the first direction X. It is arranged to cross. Therefore, it is possible to reduce the size by reducing the space in the second direction Y that accommodates the two first connection channels 213. The same applies to the two first connection channels 213 of the head main body A2 and the head main body B2.

  As shown in FIGS. 8 and 12 to 14, the holder member 210 has a concave shape in the interval 203 between the head main bodies 200 arranged in parallel in the first direction X in each head main body group 202. A first housing portion 215 is provided in the notch. That is, the holder member 210 is provided with the first housing portion 215 corresponding to the first interval 203A of the first head body group 202A and the second interval 203B of the second head body group 202B.

  The first accommodating portion 215 opens on the Z1 side surface of the holder member 210 and opens on one side surface in the second direction Y. That is, the first housing portion 215 provided at the first interval 203A of the first head body group 202A provided on the Y1 side opens on the side surface of the holder member 210 on the Y1 side. Further, the first housing portion 215 provided at the second interval 203B of the second head body group 202B provided on the Y2 side opens on the side surface of the holder member 210 on the Y2 side. In the present embodiment, the head main body group 202 is composed of two head main bodies 200, and one interval 203 is provided. Therefore, one first accommodating portion 215 is provided for each head main body group 202. Yes. Of course, when the head main body group 202 is composed of three or more head main bodies 200, two or more intervals 203 are formed, so that two or more first accommodating portions 215 are provided for each head main body group 202. May be provided. Such a 1st accommodating part 215 is formed in the depth which does not interfere with the 1st connection flow path 213. FIG. In other words, by providing the first connection channel 213 so as to be inclined with respect to the third direction Z, the first housing portion 215 can be formed on the Z1 side of the first connection channel 213. On the other hand, if the first connection flow path 213 is provided so as to pass through the Z1 side of the holder member 210, the first housing portion 215 cannot be provided. Of course, when the 1st accommodating part 215 interferes with the 1st connection flow path 213, the part in which the 1st connection flow path 213 was formed in the inside of a part of the 1st accommodation part 215 protrudes and is provided. Also good.

  In addition, the first head body group 202A and the second head body group 202B are arranged on the holder member 210 so as to be shifted from each other in the first direction X, so that the end of the first head body group 202A and the second head body group 202B are arranged. A gap 204 is provided in the first direction X between the end portions of the head body group 202B. That is, the gaps 204 are respectively provided on the X1 side of the first head body group 202A and the X2 side of the second head body group 202B. In the present embodiment, the gap 204 provided on the X1 side of the first head body group 202A is also referred to as a gap 204A, and the gap 204 provided on the X2 side of the second head body group 202B is also referred to as a gap 204B.

  Each gap 204 is provided with a second accommodating portion 216 cut into a concave shape. The second housing portion 216 is opened on the Z1 side surface of the holder member 210 and is opened on one side surface of the first direction X and one side surface of the second direction Y. In other words, the second housing portion 216 provided in the gap 204A on the Y1 side is provided to open on the side surface on the Y1 side and the side surface on the X2 side of the holder member 210. Further, the second housing portion 216 provided in the gap 204B on the Y2 side is provided to be opened on the side surface on the Y2 side and the side surface on the X1 side of the holder member 210. That is, the second storage portion 216 provided in the gap 204A is opposed to the head main body 200B1 of the second head main body group 202B in the second direction Y, and the second storage portion 216 provided in the gap 204B is The head main body group 202A is opposed to the head main body 200A2 in the second direction Y.

  In this embodiment, at least a part of the in-head roller 630 of the roller unit 610 is accommodated in the first accommodating portion 215 and the second accommodating portion 216.

  Further, as shown in FIG. 2, such a recording head 2 is mounted on the carriage 3 such that the liquid ejecting surface 20 a side protrudes toward the recording sheet S side from the carriage 3.

  As described above, the holder member 210 holds the plurality of head main bodies 200, the circuit board 220, and the flow path member 240 that supplies ink to the head main body 200. A cover member 250 that accommodates the circuit board 220, the flow path member 240, and the like is provided on the Z2 side of the holder member 210.

  Here, the flow path member 240 according to the present embodiment will be described in more detail. 16 is an exploded perspective view of the flow path member 240, FIG. 17 is a sectional view taken along line FF ′ of FIG. 16 taken along the second direction Y and the third direction Z, and FIG. GG ′ sectional view taken along the second direction Y, FIG. 19 is an HH ′ sectional view taken along the second direction Y of FIG.

  As shown in these drawings, the flow path member 240 has substantially the same width as the width of the holder member 210 in the second direction Y, and opens in the Z1 side surface in the center of the second direction Y. A recess 241 is formed. The concave portion 241 has a width that allows the circuit board 220 and the two first correction plates 230 to be inserted. In the third direction Z, the concave portion 241 extends from the Z2 side surface of the holder member 210 to the Z2 side end of the circuit board 220 (connector 221). It is formed deeper than the height up to (except for the portion provided with). Accordingly, by inserting the circuit board 220 and the two first correction plates 230 into the recess 241 of the flow path member 240, Z2 of the holder member 210 is formed on both sides of the circuit board 220 and the two first correction plates 230. The flow path member 240 can be fixed to the side surface.

  An introduction path 301 provided to open at the tip of a supply needle 242 provided to project from the surface on the Z2 side in the third direction Z of the flow path member 240 is a branch extending in the left-right direction in FIG. The branch channel 3011 communicates with the communication channel 3011, and the branch channel 3011 communicates with the communication channel 3012. The branch flow path 3011 branches the introduction path 301 to the Y1 side and the Y2 side in the second direction Y, and serves as a first branch point of the flow path member. The communication channel 3012 is defined by the channel wall 246. The flow path wall 246 extends from a position slightly away from the outer wall 245 to a position in the vertical direction between the two filters 244, and is opposite to the side surface of the flow path member 240, that is, the circuit board 220. A film 243 that is a fixing member to be welded to the outer wall portion 245 is welded and sealed to the surfaces on the Y1 side and the Y2 side. As a result, the communication flow path 3012 communicates only with the introduction path 301 on the upstream side, and enters the upstream filter chambers 3121 and 3221 of the first liquid reservoir portion 312 and the second liquid reservoir portion 322 via the outlet portion 2461 on the downstream side. Communicate.

  Thus, the flow path member 240 has the first liquid reservoir portion 312 and the second liquid reservoir portion 322 that are filter chambers on both sides in the thickness direction of the recess, that is, on both sides in the second direction Y. . According to this, since the filter chamber can be arranged by effectively utilizing the space on both sides of the substrate, the pressure loss can be further reduced in the liquid supply to the downstream side.

  In the present embodiment, the branching flow path 3011 provided on the inlet side of the flow path member 24 branches in the thickness direction, that is, the second direction Y. However, the present invention is not limited to this, and the communication flow path 3012 It is only necessary to branch in the second direction Y in the middle of the flow path to the outlet portion 2461. According to this, since the flow path member has the flow path that branches, the connection with the upstream flow path becomes simple.

  In the present embodiment, two filters 244 are provided in each of the upstream filter chambers 3121 and 3221. That is, the upstream filter chambers 3121 and 3221 are filter chambers common to the two filters 244, respectively. On the other hand, the downstream filter chambers 3122 and 3222 are separated into two corresponding to the filters 244 arranged in parallel in the first direction X. Two filters 244 provided in each of the upstream filter chambers 3121 and 3221 may be provided one by one, and the downstream filter chambers 3122 and 3222 may be separated into two, or the upstream filter chambers 3121 and 3221 may be separated. Two filters 244 provided for each of the two may be provided one by one, and the downstream filter chambers 3122 and 3222 may be provided one by one.

  In any case, in the downstream filter chambers 3122 and 3222, the flow paths are branched to the X1 side and the X2 side in the first direction X and are connected to the first supply path 313 and the second supply path 323. Two branch points.

  The spaces above the upstream filter chambers 3121 and 3221 in the vertical direction are bubble chambers 315 and 325, respectively. The bubble chambers 315 and 325 are spaces for storing bubbles removed by the filter 244, and are spaces other than the upstream filter chambers 3121 and 3221 among the spaces surrounded by the outer wall portion 245 and sealed by the film 243. . The upstream filter chambers 3121 and 3221 and the bubble chambers 315 and 325 are completely communicated spaces, and it is not necessary to specify where the boundaries are. However, the range that functions as the flow path member 240 is referred to as bubble chambers 315 and 325. In the present embodiment, the upper end in the vertical direction of the filter 244 is assumed to be the lower end of the bubble chambers 315 and 325. That is, even if air bubbles accumulate so far, the air bubbles do not contact the filter 244 and the function of the flow path member 240 is not hindered.

  A part of the communication channel 3012 described above is provided in the bubble chambers 315 and 325, but the outlet portion 2461 is below the upper end in the vertical direction of the filter 244, that is, the channel wall portion 246 is the upstream filter chamber. Since it extends to 3121 and 3221 and the outlet portion 2461 opens into the upstream filter chambers 3121 and 3221, there is no possibility that the outlet portion 2461 is blocked by bubbles. As described above, the outlet portion 2461 of the communication flow path 3012 is preferably opened at a position below the upper end position of the filter 244, preferably when it is lower than the intermediate position in the vertical direction of the filter 244.

  Note that the upper end wall portion 2462 of the flow path wall portion 246 that defines the communication flow path 3012 is provided at a predetermined interval from the outer wall portion 245. The gaps 3151 and 3251 between the upper end wall portion 2462 and the outer wall portion 245 serve as a flow path for bubbles in the bubble chambers 315 and 325, and the bubble chambers 315 and 325 are not divided in the first direction X by the flow path wall portion 246. belongs to.

  As described above, the bubble chambers 315 corresponding to the two filters 244 are communication bubble chambers communicating in the first direction X. Similarly, the bubble chambers 325 corresponding to the two filters 244 are communication bubble chambers communicating in the first direction X. Therefore, even if the amount of stored bubbles varies between the two filters, uniformization can be achieved, and as a result, a large volume of bubbles can be stored.

  In addition, the outlet portion 2461 of the communication channel 3012 is preferably provided between the two filters 244. This is because the liquid can be supplied equally to both filters 244. However, the outlet portion 2461 of the communication flow path 3012 does not necessarily need to be disposed between the filters 244 as long as the supply to both the filters 244 is sufficient.

  Here, as shown in FIG. 19 of the bubble chambers 315 and 325, since it is formed to the upper part of the recessed part 241, the dimension of the 2nd direction Y in upper part is the upstream filter chambers 3121 and 3221, the downstream filter chamber 3122, It is larger than the total size of 3222, so that many bubbles can be stored. In the present embodiment, the bubble chamber 315 and the bubble chamber 325 located on both sides in the second direction Y are separated by a partition wall 247 (see FIG. 19). By providing the partition wall 247 in this way, when either the downstream filter chamber 3122 or the downstream filter chamber 3222 has a large negative pressure, the bubbles accumulated in both the bubble chambers 315 and 325 move to the negative pressure side. Air bubbles can be prevented from entering the upstream filter chambers 3121 and 3221.

  Note that the guide member 248 that appears to separate the upstream filter chambers 3121 and 3221 and the bubble chambers 315 and 325 in FIG. 19 extends along the upper end of the filter 244 as shown in FIG. 1 is a member that is provided in a part of direction 1 and serves as a guide when the filter 244 is installed. Further, since the guide member 248 serves as a welded portion of the film 243, there is an effect that the film 243 can be supported more stably. Of course, the guide member 248 is not necessarily provided. The guide member 248 is an example of a middle wall portion.

  As described above, in the concave portion surrounded by the outer wall portion 245 on the X1 side in the first direction X of the flow path member 240, the first liquid reservoir portion 312 and the bubble chamber 315 serving as a filter chamber are provided, and X2 In the recess surrounded by the outer wall portion 245 on the side, a second liquid reservoir 322 and a bubble chamber 325 serving as a filter chamber are provided. The communication channel 3012 surrounded by the first liquid reservoir 312, the bubble chamber 315, and the channel wall 246 has the film 243 that is one fixing member common to the outer wall 245 and the channel wall 246. It is sealed by welding. In addition, the communication channel 3012 surrounded by the second liquid reservoir 322, the bubble chamber 325, and the channel wall 246 has a film 243 that is one fixing member common to the outer wall 245 and the channel wall 246. It is sealed by welding. According to this, the first and second liquid reservoirs 312 and 322 and the bubble chambers 315 and 325 which are filter chambers can be formed by sealing with the film 243 which is one common fixing member, and is relatively simple. Can be made. In addition, since the communication channel that communicates with the upstream filter chambers 3121 and 3221 through the bubble chambers 315 and 325 can also be formed by the film 243 that is a common fixing member, the communication channel can be manufactured relatively easily. The road wall portion can stably support the fixing member.

  Here, the flow path member 240 is preferably formed by resin molding. However, since the outer wall portion 245 and the flow path wall portion 246 are discontinuous, it becomes a countermeasure against sink marks in resin molding, and the flow path wall portion. The bubbles can move in the bubble chambers 315 and 325 without being obstructed by the H.246, and the capacity of the bubble chambers 315 and 325 is also improved.

  Further, the fixing member may be a plate member having rigidity instead of the film 243. However, when the film 243 is used, the cost of the fixing member can be reduced, and the welding surfaces such as the outer wall portion 245 and the flow path wall portion 246 can be reduced. Since the flatness is not required, the production is further simplified. Moreover, although the fixing member which consists of films 243 becomes a compliance, the flow-path wall part 246 can reduce it.

  As shown in FIG. 19, the first liquid reservoir 312 and the bubble chamber 315 to be a filter chamber are provided, and the concave portion in which the second liquid reservoir 322 and the bubble chamber 325 to be a filter chamber are provided is vertical. Above the direction, that is, above the first liquid reservoir 312 and the second liquid reservoir 322, the dimension in the second direction Y is large, that is, the recess is formed deep. According to this, it is possible to increase the size of the filter while effectively arranging the wiring board for driving the head body, and to reduce the pressure loss due to the filter 244. Furthermore, since the dimensions of the bubble chambers 315 and 325 are larger than the dimensions of the first liquid reservoir portion 312 and the second liquid reservoir portion 322 that are filter chambers in the direction perpendicular to the filter, a large amount of bubbles can be stored. .

  Furthermore, as described above, each of the bubble chambers 315 and 325 corresponds to the two filters 244, and each is a communication bubble chamber communicating in the first direction X, but in the second direction Y, The chamber 315 and the bubble chamber 325 are separated by a partition wall 247. In this way, even when the liquid is not discharged over the entire width of the recording head 2 in the first direction X, but is discharged over a part of the width of the recording head 2, It is possible to reduce the deviation of the amount of bubbles stored in each of the bubble chamber 315 and the bubble chamber 325 separated by the partition wall 247. As a result, it is possible to prevent bubbles accumulated in any one of the bubble chambers 315 and 325 from moving to the negative pressure side and entering the upstream filter chambers 3121 and 3221.

  Next, the cover member 250 will be described in detail. As shown in FIGS. 3, 6, 7, 11 to 13, 15, and 17, the cover member 250 is integrated with the holder member 210, and the circuit board 220 and the flow path member 240 are contained therein. It is a member to accommodate. That is, the cover member 250 is a member that is integrated with the holder member 210 and can form an internal space 259 having a size that can accommodate the circuit board 220 and the flow path member 240.

  In the present embodiment, the cover member 250 has a box shape having an opening on the Z1 side in the third direction Z and having a bottom portion on the Z2 side. Then, the opening on the Z1 side of the cover member 250 is sealed with the surface on the Z2 side of the holder member 210, so that the internal space 259 is formed.

  Such a cover member 250 includes a seal portion 253 that contacts the holder member 210 and a rigid portion 254 having a higher Young's modulus than the seal portion 253.

  The seal portion 253 is a portion that is in contact with the holder member 210 and is formed of a different material having a higher Young's modulus than a rigid portion 254 described later. The seal portion 253 is elastically deformed when the cover member 250 is pressed toward the holder member 210, fills a gap at the boundary between the cover member 250 and the holder member 210, and prevents ink from entering the internal space 259. Has an effect.

  The rigid portion 254 is a portion that substantially forms the internal space 259 together with the holder member 210, and is made of a material having a higher Young's modulus than the seal portion 253. By forming the rigid portion 254 with such a material, the rigidity of the cover member 250 can be improved, and the circuit board 220 and the flow path member 240 accommodated in the internal space 259 can be protected.

  Further, the rigid portion 254 has a box shape having an opening on the Z1 side in the third direction Z and having a bottom portion on the Z2 side. Specifically, the rigid portion 254 is orthogonal to the first direction X and the second direction Y, has four side surfaces 255 connected to the seal portion 253, and all of these side surfaces 255 and Z2 in the third direction Z. Including the ceiling 256 provided on the side, the whole is formed in a substantially rectangular parallelepiped shape. Thus, since not only the side surface 255 but the ceiling 256 is included, the strength of the cover member 250 can be improved.

  In the present embodiment, the cover member 250 has a box shape, but is not limited to such a mode. For example, the holder member 210 may have a box shape opened to the Z2 side, and the cover member 250 may be a plate-like member that seals the opening.

  The seal portion 253 is provided at an end portion of the rigid portion 254 that opens to the Z1 side in the third direction Z, that is, a portion that contacts the Z2 side surface of the holder member 210 if the seal portion 253 is not provided. Such seal portion 253 and rigid portion 254 are formed by two-color molding. As described above, there is no particular limitation as long as the rigid portion 254 is formed of a material having a higher Young's modulus than the seal portion 253. For example, a resin material is used for the rigid portion 254, and an elastic material is used for the seal portion 253. An elastomer can be used.

  The seal portion 253 formed by the two-color molding has a contour that accommodates the circuit board 220 and the flow path member 240 in a plan view with respect to the liquid ejection surface 20a, in this embodiment, in a plan view as viewed from the third direction Z. . The outline of the seal portion 253 according to the present embodiment is annular and substantially rectangular according to the opening shape on the Z1 side of the rigid portion 254. That is, the seal portion 253 is composed of two long side portions 253a and two short side portions 253b. The long side portion 253a is a portion extending in the first direction X in the seal portion 253, and two long sides 253a are arranged in parallel in the second direction Y. The short side portion 253b is a portion of the seal portion 253 that is shorter than the long side portion 253a and extends in the second direction Y, and two short side portions 253b are arranged in parallel in the first direction X.

  The circuit board 220 and the flow path member 240 being accommodated in such an outline means that the circuit board 220 and the flow path member 240 are arranged inside the outline of the seal portion 253 in the plan view. .

  In such a contour of the seal portion 253, at least a portion that intersects the second direction Y, which is the conveyance direction in which the recording sheet S is conveyed, forms the outermost side of the recording head 2. Of the outline, the portion that intersects the second direction Y refers to a portion that includes a component that intersects the second direction Y in the plan view. In the present embodiment, the long side portion 253 a extending in the first direction X orthogonal to the second direction Y is a portion that intersects the second direction Y.

  The long side portion 253a which is a part of the outline of the seal portion 253 forms the outermost side of the recording head 2 is a cross section parallel to the liquid ejecting surface 20a and in the cross section including the seal portion 253, the long side portion 253a. This constitutes a part of the outline of the entire recording head 2. In other words, at least in the second direction Y, there are no parts constituting the recording head 2 outside the long side portion 253a.

  In the present invention, at least a portion that intersects the second direction Y forms the outermost side of the recording head 2, but a portion of the outline of the seal portion 253 that does not intersect the second direction Y is also included in the recording head 2. It may be the outermost side.

  In the present embodiment, the seal portion 253 is formed so that the portion that does not intersect the second direction Y, that is, the short side portion 253b that is parallel to the second direction Y, also forms the outermost side of the recording head 2.

  Specifically, the outlines of the holder member 210 and the cover member 250 form the outline of the entire recording head 2 in the plan view. That is, the side surface of the holder member 210 (that is, the side surface orthogonal to the first direction X and the second direction Y) and the side surface 255 of the cover member 250 constitute the outermost side of the recording head 2. The seal portion 253 is formed in an annular shape on the end surface on the Z1 side of the side surface 255 of the cover member 250.

  By forming the cover member 250 in this way, the seal portion 253 configures the outermost part of the outline of the entire recording head 2 formed by the holder member 210 and the cover member 250 in a cross section parallel to the liquid ejecting surface 20a. Yes.

  As described above, in the recording head 2 according to the present embodiment, the seal portion 253 is formed on the cover member 250. Accordingly, the boundary portion between the holder member 210 and the cover member 250 is sealed by the seal portion 253, and it is possible to more reliably suppress the ink from entering the internal space 259 from the boundary portion. Thereby, electronic components such as the circuit board 220 constituting the recording head 2 can be protected.

  The cover member 250 has a seal portion 253 and a rigid portion 254 formed by two-color molding. According to the two-color molding, the seal portion 253 can be formed so as to fit within the width of the narrow side surface 255 on the Z1 side. Accordingly, if the outline of the recording head 2 in plan view is defined by the cover member 250 and the holder member 210 having the rigid part 254 having high rigidity, the seal part 253 can be provided without protruding outside the outline.

  Here, if the sealing portion 253 is replaced by a sealing member different from the rigid portion 254 instead of the two-color molding, the width of the sealing member is matched with the width of the side surface 255 of the rigid portion 254. When such a sealing member is sandwiched between the Z2 side surface of the holder member 210 and the Z1 side end surface of the side surface 255 of the rigid portion 254, if the sealing member is to be sealed, the width of the sealing member is narrow. The side surface 255 is displaced from the seal member, and it is difficult to secure the seal. Further, by enlarging the width of the seal member to be larger than the width of the side surface 255, it is possible to suppress the side surface 255 from being displaced from the seal member, and in order to achieve a reliable seal, the width of the seal member is increased. The size in at least the second direction Y is increased.

  In the recording head 2 according to this embodiment, since the seal portion 253 is formed integrally with the rigid portion 254 by two-color molding as described above, the seal portion 253 does not become larger than the outer shape of the rigid portion 254. The increase in size of the recording head 2 can be suppressed.

  Furthermore, in the recording head 2 according to the present embodiment, the seal portion 253 has at least a long side portion 253a that intersects the second direction Y, which is the transport direction, forming the outline of the recording head 2. That is, the recording head 2 can be reduced in size in the second direction Y.

  Here, as an aspect in which the long side portion intersecting the second direction Y does not form the outline of the entire recording head 2, for example, the recording head 2 is configured outside the seal portion 253 in the second direction Y. The structure by which the other member to perform is provided is mentioned. In such an aspect, the recording head 2 is increased in size by the amount of the other member provided in the second direction Y.

  In the recording head 2 according to the present embodiment, since there are no other members constituting the recording head 2 outside the seal portion 253 as in the above-described aspect, the size of the recording head 2 in the second direction Y is increased. Can be suppressed.

  In particular, in the recording head 2 according to the present embodiment, the outermost contour of the recording head 2 is formed not only on the long side portion 253a that intersects the second direction Y but also on the short side portion 253b. Therefore, the recording head 2 can suppress an increase in size even in the first direction X.

  Next, the configuration of the first correction plate 230 and the circuit board 220 of the recording head 2 according to the present embodiment will be described in detail with reference to FIG. FIG. 20 is a side view and a plan view showing the arrangement of the first correction plate and the circuit board fixed to the holder member according to the present embodiment. FIG. 20A is a side view from the second head body group 202B side, that is, the Y2 side in the second direction Y, and FIG. 20B is a plan view. Further, in the figure, the flow path member 240, the cover member 250, and the wiring board 121 are not shown.

  The recording head 2 according to the present embodiment includes a first correction plate 230 having a correction main body 231, an opening 233, and leg portions 232 arranged on both sides of the opening 233 in the first direction X. Of the two sandwiching the circuit board 220 in the second direction Y, the first head body group 202A side is also referred to as a first correction plate 230a, and the second head body group 202B side is also referred to as a first correction plate 230b.

  In addition, connection portions 226 are provided on both surfaces of the circuit board 220. Among the connection portions 226, the connection portion 226 provided on the Y1 side surface in the second direction Y is also referred to as a first connection portion 226a, and the connection portion 226 provided on the Y2 side surface is the second connection portion 226b. Also called.

  The first connection portion 226a is connected to the wiring board 121 of the head main body 200 constituting the first head main body group 202A, and the second connection portion 226b is connected to the wiring board 121 of the head main body 200 constituting the second head main body group 202B. Connected to.

  The leg portion 232 of one first correction plate 230a of the set of first correction plates 230 overlaps with the second connection portion 226b in the first direction X, and extends to the first connection portion 226a. It is arranged in a position that does not overlap.

  Further, the leg portion 232 of the other first correction plate 230b of the pair of first correction plates 230 overlaps the first connection portion 226a and overlaps the second connection portion 226b in the first direction X. It is arranged at a position where it is not possible.

  By arranging the respective leg portions 232 of the first correction plate 230a and the first correction plate 230b as described above with respect to the first connection portion 226a and the second connection portion 226b, there are two first connection portions. One of the X1 sides of 226a and one of the two second connection portions 226b on the X2 side are not arranged inside the opening 233 of the first correction plate 230 in plan view.

  In the recording head 2 according to the present embodiment, the leg portions 232 of the first correction plate 230a and the first correction plate 230b are arranged as described above with respect to the first connection portion 226a and the second connection portion 226b. . Accordingly, it is necessary to dispose the leg portions 232 of the first correction plate 230 on the outer side in the first direction X of all the first connection portions 226a and on the outer side in the first direction X of all the second connection portions 226b. Therefore, the size in the first direction X can be reduced accordingly.

  Further, although not particularly illustrated, in the plan view of the circuit board 220, the first connection portion and the second connection portion overlap each other, and the width of the leg portion 232 in the first direction X is the opening portion 233 in the first direction X. The recording head may be narrower than the width.

  According to the recording head of this aspect, since the first connection portion and the second connection portion overlap each other, the interval between the head main bodies 200 arranged in the first direction X can be reduced. Thereby, it is possible to reduce the size of the recording head in the first direction X. Furthermore, in the first direction X, the second head main body connected to the second connection portion via the wiring substrate 121 in the first direction X to the first head main body group 202A connected to the first connection portion via the wiring substrate 121. The group 202B can be arranged in an overlapping manner. Further, since the width of the leg portion 232 is narrower than the width of the opening portion 233, the size can be reduced in the first direction X.

  Of course, in the plan view of the circuit board 220, the first connection portion and the second connection portion may be a recording head that does not overlap each other. Further, the recording head may be configured such that the width of the leg portion 232 in the first direction X is wider than the width of the opening portion 233 in the first direction X.

  In the liquid ejecting head described above, the first supply path 313 of the flow path member 240 common to the X1 side head main body 200 of the first head main body group 202A and the X1 side head main body 200 of the second head main body group 202B. From the Y1 side nozzle row of the head main body 200 of the first head main body group 202A and the Y1 side nozzle row of the head main body 200 of the second head main body group 202B, and from the second supply path 323, Liquid is supplied to the nozzle array on the head body 200Y2 side of the first head body group 202A and the nozzle array on the Y2 side of the head body 200 of the second head body group 202B.

  A schematic diagram of this connection state is shown in FIG. FIG. 27 is a perspective view of the nozzle row from above. The first nozzle row 2001 and the third nozzle row 2003 are provided in one nozzle plate, and the positions in the first direction X overlap. The position in the second direction Y is different, and the second nozzle row 2002 and the fourth nozzle row 2004 are provided in one nozzle plate, and the positions in the first direction X overlap, but the second direction The position of Y is different. In addition, the positions of the first nozzle row 2001 and the third nozzle row 2003 and the second nozzle row 2002 and the fourth nozzle row 2004 in the second direction Y are different. In such a nozzle arrangement, the bubble chambers 315 and 325 corresponding to the two nozzle rows arranged in parallel in the first direction X are common, and the communication bubble chambers in which the bubbles can move with each other are formed. In the direction Y, the bubble chamber 315 and the bubble chamber 325 are separated. As described above, in the second direction Y, by separating the bubble chamber 315 and the bubble chamber 325, the liquid is discharged over the entire width of the recording head 2 in the first direction X. Even when the liquid is discharged over a part of the width of the recording head 2, the amount of bubbles stored in the bubble chamber 315 and the bubble chamber 325 separated by the partition wall 247 is biased. Can be reduced. As a result, it is possible to prevent bubbles accumulated in any one of the bubble chambers 315 and 325 from moving to the negative pressure side and entering the upstream filter chambers 3121 and 3221.

  Here, the nozzle rows overlap in the first direction X means that the first nozzle row 2001 and the third nozzle row 2003 may be shifted by a half pitch as shown in FIG. 27, or as shown in FIG. It does not have to be shifted by a half pitch. In addition, when the positions of the nozzle rows are different in the first direction X, as shown in FIG. 27 and FIG. 28, those that partially overlap are included.

  In addition, by providing two nozzle rows in one nozzle plate, it is possible to facilitate alignment between the two nozzle rows while reducing the dimension in the second direction Y. The nozzle plate may be provided with one nozzle row. For example, as shown in FIG. 29, the first to fourth nozzle rows 2001 to 2004 may be provided on different nozzle plates. If the bubble chamber 315 and the bubble chamber 325 overlap with each other in the first direction X and correspond to different nozzle rows in the second direction Y, for example, as shown in FIG. The bubble chamber 325 may be connected to the third nozzle row 2003 by connecting to the row 2004.

  In addition, for the nozzle rows in which the positions in the second direction Y are different from each other and the positions in the first direction X overlap at least partially, the bubble chamber 315 and the bubble chamber 325 may be separated by the partition wall 247. The number of nozzle rows connected to the chamber 315 and the bubble chamber 325 is not limited to two. When a set of nozzle rows connected to the bubble chamber 315 is a first nozzle group and a set of nozzle rows connected to the bubble chamber 325 is a second nozzle group, the first nozzle group and the second nozzle group are the second nozzle group. Since the positions in the direction Y are different from each other and the positions in the first direction overlap at least partially, even if the liquid consumption in each filter chamber varies, the position in the first direction is at least one. As a result, the amount of bubbles stored in the bubble chamber is less likely to vary by the amount of overlap, and the stored bubbles can be prevented from blocking a certain filter chamber. Although the first nozzle group may be provided on one nozzle plate and the second nozzle group may be provided on one nozzle plate, the first and second nozzle groups are formed by a plurality of nozzle rows. Thus, the nozzle group can be easily elongated in the first direction.

<Embodiment 2>
Here, the flow path member 240A according to another embodiment will be described. 21 is an exploded perspective view of the flow path member 240A, FIG. 22 is a cross-sectional view taken along the line II ′ of FIG. 21 taken along the second direction Y and the third direction Z, and FIG. FIG. 6 is a cross-sectional view taken along line JJ ′ along the second direction Y and the third direction Z. In addition, the same code | symbol is attached | subjected to the same member as FIGS. 16-19, and the overlapping description is abbreviate | omitted.

  As shown in these drawings, the flow path member 240A is arranged such that the supply needle 242 is not located in the central portion of the first direction X but at a position biased in the X1 direction, and is connected to the introduction path 301 in the supply needle 242. The branching flow path 3011 that communicates is provided immediately below the supply needle 242. Therefore, the flow path wall portion 246A that defines the communication flow path 3013 that communicates with the branch flow path 3011 includes a communication section 2463 that communicates with the branch flow path 3011 directly below the supply needle 242 and a downward central direction. It has an inclined portion 2464 that is inclined and a linear portion 2464 that extends downward between the two filters 244, and the tip of the linear portion 2465 becomes an outlet portion 2461.

  In the present embodiment, a fixed wall portion 249 having substantially the same shape as the inclined portion 2463 is provided at a position that is line-symmetric with respect to the flow path wall portion 246A. The fixed wall portion 249 is a welded portion of the film 243 in the same manner as the flow path wall portion 246A. Thereby, since the film 243 is held by the welded portions provided symmetrically, the film 243 is held more stably. Of course, the fixed wall portion 249 is not necessarily provided.

  The inclined portion 2463 and the fixed wall portion 249 of the flow path wall portion 246A can be provided horizontally without being inclined, but are preferably inclined. If it is provided horizontally, the bubbles may stay along the lower part of the wall surface, but by inclining, the bubbles can be reliably moved upward in the vertical direction. Further, the flow path wall portion 246A and the fixed wall portion 249 are preferably discontinuous with the outer wall portion 245. This is to prevent the movement of bubbles.

<Other embodiments>
As mentioned above, although one Embodiment of this invention was described, the basic composition of this invention is not limited to what was mentioned above.

  For example, in the flow path members 240 and 240A of the above-described embodiment, the first liquid reservoir 312 and the second liquid reservoir 322 and the bubble chambers 315 and 325 are provided on both sides in the second direction Y, but only on one side. May be provided.

  Further, in the flow path members 240 and 240A of the above-described embodiment, the film 243 is used as the fixing member, but a plate member having rigidity may be used.

  In the channel members 240 and 240A of the above-described embodiment, the filter 244 is provided in parallel to the vertical direction, but may be slightly inclined from the vertical direction, and is also provided along the vertical direction. .

  Further, in the flow path members 240 and 240A of the above-described embodiment, one supply needle 242 that is a liquid introduction port is branched into two communication flow paths 3012. However, two introduction ports may be provided. Further, the configuration and branching position for forming the branching channel 3011 are not limited to the structure of the above-described embodiment.

  In the flow path members 240 and 240A of the above-described embodiment, the communication flow path is formed by fixing the fixing member to the flow path wall portion, but the present invention is not limited to this.

  Further, although the fixing locus between the fixing member and the outer wall portion and the fixing locus between the flow path wall portion and the fixed wall portion are discontinuous, they are not necessarily discontinuous.

  In the first embodiment, the flow path member 240 is one for each of the two head main bodies 200 that are adjacent in the second direction Y, that is, the head main body 200 on the X1 side of the first head main body group 202A and the first main body 200. A flow path member 240 common to the head body 200 on the X1 side of the two head body group 202B, the head body 200 on the X2 side of the first head body group 202A, and the head body 200 on the X2 side of the second head body group 202B. However, the present invention is not limited to this. For example, one for each head main body 200 or one for four head main bodies 200 may be used.

  Further, in the first embodiment described above, the first correction plate 230 is configured to be shorter than the width of the holder member 210 in the first direction X, but is not limited to such an aspect. There are no particular limitations on the size or thickness of the circuit board 220 as long as it is a planar shape that faces both surfaces of the circuit board 220.

  The recording head 2 according to the first embodiment includes the first correction plate 230 and the second correction plate 280, but is not limited to such a mode. That is, the recording head 2 only needs to include at least the first correction plate 230 and may be a recording head that does not include the second correction plate 280.

  In addition, the recording head 2 according to the first embodiment includes the planar second correction plate 280 parallel to the liquid ejecting surface 20a. However, the recording head 2 is not necessarily parallel to the liquid ejecting surface 20a. In addition, the second correction plate 280 is not limited to a case where the second correction plate 280 is made of a material having higher rigidity than that of the holder member 210, and may be formed of a material equivalent to or lower in rigidity than the holder member 210. Further, the second correction plate 280 has a size that covers the liquid ejection surfaces of all the head main bodies 200 in a plane parallel to the liquid ejection surface 20a, but is not limited thereto.

  Further, although the restriction member 218 is provided on the holder member 210, the invention is not limited to this, and the restriction member may not be provided. Further, the restricting portion 218 may be integrated with the holder member 210 or may be a separate member.

  The recording head 2 according to the first embodiment includes the exposed portion 290, but is not limited to such an aspect. For example, the cover member 250 may be provided with an opening through which the supply needle 242 is exposed. That is, the exposed portion 290 may be an embodiment that does not include the side wall portion 291, the ceiling portion 292, and the cutout portion 295 that constitute the exposed portion 290.

  In the recording head 2 according to the first embodiment, the seal portion 253 by two-color molding is provided between the holder member 210 and the cover member 250. However, the present invention is not limited to such a mode. For example, you may use the sealing member which consists of a cyclic | annular elastic material of another member which is not two-color molding.

  In the recording head 2 according to the first embodiment, the Young's modulus of the holder member 210 is higher than the Young's modulus of the rigid portion 254 of the cover member 250, but is not limited to such a mode.

  In the first embodiment described above, one recording head 2 is provided on the carriage 3. However, the present invention is not particularly limited thereto. For example, two or more recording heads 2 may be provided on the carriage 3.

  In the first embodiment described above, the configuration in which one type of ink is ejected from one recording head 2 is illustrated. However, the present invention is not particularly limited thereto. For example, different inks may be ejected for each nozzle row. Good.

  In the first embodiment described above, the parallel direction of the head main body 200 of the recording head 2 is the first direction X when mounted on the ink jet recording apparatus 1, but is not particularly limited thereto. For example, the juxtaposed direction of the head main bodies 200, that is, the juxtaposed direction of the nozzle openings 21 may be a direction inclined with respect to the first direction X of the ink jet recording apparatus 1. That is, the head main bodies 200 constituting the head main body group 202 may be arranged side by side in a direction inclined with respect to the axial direction of the carriage shaft. Similarly, the parallel arrangement direction of the head main body group 202 is the second direction Y, but is not limited thereto. For example, the parallel arrangement direction of the head main body group 202 is a direction inclined with respect to the second direction Y. It may be.

  In the first embodiment described above, the thin film type piezoelectric actuator 130 has been described as the pressure generating means for causing a pressure change in the pressure generating chamber 12. However, the present invention is not limited to this, and for example, a green sheet is attached. A thick film type piezoelectric actuator formed by the above method, a longitudinal vibration type piezoelectric actuator in which piezoelectric materials and electrode forming materials are alternately stacked and expanded and contracted in the axial direction can be used. Also, as a pressure generating means, a heating element is arranged in the pressure generating chamber, and droplets are discharged from the nozzle opening by bubbles generated by the heat generated by the heating element, or static electricity is generated between the diaphragm and the electrode. Thus, a so-called electrostatic actuator that discharges liquid droplets from the nozzle openings by deforming the diaphragm by electrostatic force can be used.

  In the above embodiment, an ink jet recording head has been described as an example of a liquid ejecting head, and an ink jet recording apparatus has been described as an example of a liquid ejecting apparatus. The present invention is intended for general ejection heads and liquid ejection apparatuses, and can of course be applied to liquid ejection heads and liquid ejection apparatuses that eject liquid other than ink. Other liquid ejecting heads include, for example, various recording heads used in image recording apparatuses such as printers, color material ejecting heads used in the manufacture of color filters such as liquid crystal displays, organic EL displays, and FEDs (field emission displays). Examples thereof include an electrode material ejecting head used for electrode formation, a bio-organic matter ejecting head used for biochip production, and the like.

  DESCRIPTION OF SYMBOLS 1 Inkjet recording device (liquid ejecting apparatus), 2 Recording head (liquid ejecting head), 121 Wiring board, 200 Head main body, 202 Head main body group, 210 Holder member, 213 1st connection flow path (2nd flow path), 214 second connection flow path (second flow path), 218 regulating section, 220 circuit board, 221 connector (electronic component), 225 board, 226 connection section, 230 first correction plate, 231 correction body section, 232 leg section, 233 opening, 240 channel member, 241 recess, 242 supply needle, 243 film, 244 filter, 245 outer wall, 246 channel wall, 247 partition, 248 guide member, 249 fixed wall, 250 cover member, 253 seal Part, 254 rigid part, 255 side, 256 Ceiling, 260 fixing plate, 280 second straightening plate, 290 exposed portion, 300 flow path (second flow path), 301 introduction path, 312 first liquid reservoir, 322 second liquid reservoir, 3011 branch flow channel, 3012 communication channel, 3121, 3221 upstream filter chamber, 3122, 3222 downstream filter chamber

Claims (7)

A head body that ejects liquid droplets from nozzle groups having nozzle openings whose positions in the first direction are different from each other on the liquid ejection surface;
A filter chamber that contains a flow path for supplying a liquid to the head body, a filter provided in the middle of the flow path, an upstream filter chamber on the upstream side of the filter, and a downstream filter chamber on the downstream side of the filter. And a flow path member having a bubble chamber that communicates with the upstream filter chamber and stores bubbles removed by the filter,
With
A first nozzle group and a second nozzle group that are different in position in a second direction orthogonal to the first direction on the liquid ejection surface and that overlap at least partially in the position in the first direction. And
The flow path of the flow path member includes a branch flow path that branches in the middle and communicates with the first nozzle group and the second nozzle group,
The liquid jet head according to claim 1, wherein the bubble chamber is provided for each of the branch flow paths. The first nozzle group includes a first nozzle row and a second nozzle row along the first direction, and the second nozzle group includes a third nozzle row and a first nozzle row along the first direction. Having a fourth nozzle row;
Regarding the position in the first direction, the amount of the first nozzle row and the second nozzle row overlapping each other is less than the amount of the first nozzle row and the third nozzle row overlapping each other,
Regarding the position in the first direction, the amount of the third nozzle row and the fourth nozzle row overlapping each other is less than the amount of the second nozzle row and the fourth nozzle row overlapping each other,
In common with the first nozzle row and the second nozzle row, a first communicating bubble chamber is provided in which bubbles in the bubble chamber corresponding to each nozzle row can move with each other,
In common with the third nozzle row and the fourth nozzle row, a second communication bubble chamber is provided in which the bubbles in the bubble chamber corresponding to each nozzle row can move to each other,
The first communication bubble chamber is one of the bubble chambers provided for each branch flow path, and the second communication bubble chamber is the other of the bubble chambers provided for each branch flow path.
The liquid jet head according to claim 1. In the head body, the first nozzle row and the third nozzle row are provided in a single nozzle plate, and the second nozzle row and the fourth nozzle row are provided in a single nozzle plate. Provided,
The liquid ejecting head according to claim 2. There are a plurality of the head bodies, and each of the plurality of head bodies has a plurality of nozzle rows corresponding to the first communicating bubble chamber and a plurality of nozzle rows corresponding to the second communicating bubble chamber. The liquid jet head according to claim 2 or 3. The flow path includes a first branch point that branches in the middle of the flow path and a second branch point that branches downstream from the first branch point,
The first communication bubble chamber corresponds to one filter chamber of the flow path branched at the first branch point,
The second communication bubble chamber corresponds to the other filter chamber of the flow path branched at the first branch point.
The liquid ejecting head according to claim 2, wherein the liquid ejecting head is a liquid ejecting head. Each of the bubble chambers is two-dimensionally arranged on a plane parallel to the liquid ejection surface,
The first branch point is a branch point that branches into the flow path extending to one side in the direction orthogonal to the first direction and the flow path extending to the other side,
The second branch point is a branch point that branches into the flow path extending to one side in the first direction and the flow path extending to the other side.
The liquid jet head according to claim 1, wherein:   A liquid ejecting apparatus comprising the liquid ejecting head according to claim 1.

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