Patent Publication Number: US-8991981-B2

Title: Liquid ejecting head and liquid ejecting apparatus

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present application claims priority to Japanese Patent Application No. 2013-167009 filed on Aug. 9, 2013 which is hereby incorporated by reference in its entirety. 
     BACKGROUND 
     1. Technical Field 
     Embodiments of the present invention relate to a liquid ejecting head that ejects a liquid from a nozzle, and to a liquid ejecting apparatus. More particularly, embodiments relate to an ink jet type recording head that discharges a liquid such as ink, and to an ink jet type recording apparatus. 
     2. Related Art 
     Representative examples of liquid ejecting heads that discharge liquid droplets include ink jet type recording heads that discharge ink droplets. Proposed as an example of the ink jet type recording heads is an ink jet type recording head that includes a head chip that has a flow path forming substrate where a pressure generating chamber communicating with a nozzle is formed, and a case member where a wiring substrate that is connected to a pressure generating unit which is disposed in the head chip is held Thea wiring substrate and the pressure generating unit of the head chip are interconnected via a wiring member such as a chip-on-flex (COF) (for example, refer to JP-A-2010-115918). 
     However, when two communication ports that are disposed in the head chip are disposed in proximity to each other, an area where a connection between a conductive member such as the COF and the wiring substrate is performed between connection flow paths respectively connected to the two communication ports is narrowed. As a result, it is difficult to perform the connection between the conductive member and the wiring substrate. 
     In addition, the disadvantage of an increased size of the head arises when the two communication ports are separated. 
     These disadvantages are not limited to the ink jet type recording head, and are present in a similar manner in liquid ejecting heads ejecting other liquids. 
     SUMMARY 
     An advantage of some embodiments of the invention is to provide a liquid ejecting head and a liquid ejecting apparatus that can be compact in size. 
     According to an embodiment of the invention, a liquid ejecting head is provided. The liquid ejecting head includes a head chip in which two or more nozzle groups, each being configured by a plurality of nozzles, are disposed in a reference direction on a liquid ejecting surface. A first inlet is disposed on the surface side of the head chip opposite to the liquid ejecting surface to communicate with one of the nozzle groups and a second inlet that communicates with the other nozzle group are disposed in the reference direction. The head chip includes a wiring member with one end portion connected to a pressure generating unit, which is disposed between the first inlet and the second inlet to generate a pressure change in a flow path in the head chip. The other end portion of the wiring member extends in the direction opposite to a direction of liquid ejection from the nozzles. The head chip includes a first connection flow path is connected to the first inlet, a second connection flow path is connected to the second inlet, and a wiring substrate to which the other end portion of the wiring member is connected between the first connection flow path and the second connection flow path. The second connection flow path has an extending flow path that extends from the second inlet toward the reference direction separated from the first inlet, and the wiring substrate is arranged on the side of the second connection flow path opposite to the first inlet from the extending flow path to extend in the reference direction beyond the second connection flow path from between the first connection flow path and the second connection flow path. 
     In this aspect, the wiring member and the wiring substrate can be interconnected between the first connection flow path and the second connection flow path without widening a gap between the first inlet and the second inlet. As a result, the head chip can be compact in size and the connection between the wiring member and the wiring substrate can be ensured. In addition, inconveniences such as a disconnection of the wiring member attributable to excessive bending can be suppressed since the wiring member does not have to be extended outside the connection flow path. 
     Herein, the first connection flow path and the second connection flow path may be connected to a common flow path that is common on the side of the wiring substrate opposite to the first inlet and the second inlet. In this case, it is difficult to extend the wiring member beyond the common flow path since the first inlet and the second inlet are connected to the common flow path, but the connection between the wiring member and the wiring substrate can be ensured between the first connection flow path and the second connection flow path further downstream than the common flow path. 
     In addition, the liquid ejecting head may include a first head chip where two or more nozzle groups are disposed and a second head chip where two or more nozzle groups are disposed. The first inlet and the second inlet are respectively disposed in each of the first head chip and the second head chip. The first head chip and the second head chip are disposed in a first direction so that the first inlet is on the second head chip side in the first head chip and the first inlet is on the first head chip side in the second head chip. In this case, a gap between the first head chip and the second head chip can be narrowed in a state where interference between the first connection flow path connected to the first inlet of the first head chip and the first connection flow path connected to the first inlet of the second head chip is suppressed. Accordingly, the head can be compact in size. 
     In addition, the wiring substrate may have an opening portion into which the first connection flow path of the first head chip and the first connection flow path of the second head chip are inserted. In this case, processing of the wiring substrate can be facilitated and costs can be reduced. 
     In addition, can the wiring member of the first head chip and the wiring member of the second head chip be inserted into the opening portion. In this case, the wiring member can be inserted with ease into the opening portion with a large opening area and assemblability can be improved. 
     In addition, the first connection flow path can be linearly formed in the direction of liquid ejection. The first connection flow path of the first head chip, the first connection flow path of the second head chip, the wiring member that is disposed to be upright in the direction of liquid ejection of the first head chip, and the wiring member that is disposed to be upright in the direction of liquid ejection of the second head chip be inserted into the opening portion. In this case, the wiring member can be inserted with ease into the opening portion with a large opening area and assemblability can be improved. In addition, the wiring area can be ensured and the wiring substrate can be compact in size, by decreasing the opening area of the opening portion, when the first connection flow path that is linearly disposed in the direction of liquid ejection and the wiring member that is disposed to be upright in the direction of liquid ejection are inserted into the opening portion. 
     In addition, the other end portion side of the wiring member can be bent along a surface of the wiring substrate in a direction separated from the first inlet in the first direction and can be connected to the wiring substrate. In this case, the wiring member can have a low back when the wiring member is bent and the connection between the wiring member and the wiring substrate can be performed with ease. As such, assemblability can be improved. 
     In addition, a terminal portion can be disposed on the surface of the wiring substrate and a surface of connection between the wiring member and the terminal portion can be in a direction along the surface of the wiring substrate. In this case, the wiring member and the terminal portion can be interconnected from one surface side. 
     In addition, the extending flow path can extend in a horizontal direction that is orthogonal to the direction of liquid ejection. In this case, the first connection flow path and the second connection flow path can be separated as far as possible in a short flow path length. 
     In addition, the wiring member can be formed from a sheet-shaped member, a drive circuit that drives the pressure generating unit can be disposed on one surface of the wiring member, and the distance from the drive circuit to the second inlet can be shorter than the distance from the drive circuit to the first inlet. 
     Further, according to another aspect of the invention, a liquid ejecting apparatus that includes the liquid ejecting head described above is provided. In this case, the liquid ejecting apparatus can be compact in size. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Embodiments of the invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements. 
         FIG. 1  is an exploded perspective view of an example of a first head chip. 
         FIG. 2  is a plan view of the first head chip. 
         FIG. 3  is a sectional view of the first head chip. 
         FIG. 4  is a plan view of and example of a second head chip. 
         FIG. 5  is an exploded perspective view of an example of a recording head 
         FIG. 6  is a sectional view of the recording head. 
         FIG. 7  is an enlarged sectional view of a main part of the recording head. 
         FIG. 8  is a schematic perspective view of an example recording apparatus 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Hereinafter, embodiments of the invention will be described in detail with reference to the accompanying drawings. 
     Firstly, an example of a head chip that is disposed in an ink jet type recording head (hereinafter, simply referred to as a recording head) which is an example of a liquid ejecting head according to one embodiment of the invention will be described.  FIG. 1  is an exploded perspective view of an example of a first head chip.  FIG. 2  is a plan view of the first head chip.  FIG. 3  is a sectional view of the first head chip. 
     As illustrated in the drawings, the head chip is a first head chip  2 A that is mounted on the ink jet type recording head which is an example of the liquid ejecting head. The first head chip  2 A includes a plurality of members such as a head main body  11  and a case member  40  that is fixed to one side surface of the head main body  11 . In addition, the head main body  11  includes a flow path forming substrate  10 , a communicating plate  15  that is disposed on one surface side of the flow path forming substrate  10 , a nozzle plate  20  that is disposed on the surface side of the communicating plate  15  opposite to the flow path forming substrate  10 , a protective substrate  30  that is disposed on the side of the flow path forming substrate  10  opposite to the communicating plate  15 , and a compliance substrate  45  that is disposed on the surface side of the communicating plate  15  where the nozzle plate  20  is disposed. 
     A metal such as stainless steel and Ni, a ceramic material typified by ZrO 2  or Al 2 O 3 , an oxide such as a glass ceramic material, MgO, and LaAlO 3 , and the like can be used in the flow path forming substrate  10  that constitutes or is included in the head main body  11 . In one embodiment, the flow path forming substrate  10  may be formed of a silicon single crystal substrate. A plurality of pressure generating chambers  12  that are partitioned by a partition wall are juxtaposed on the flow path forming substrate  10  through anisotropic etching from the one surface side. Hereinafter, this direction is referred to as a direction of juxtaposition of the pressure generating chambers  12 , or a first direction X. In addition, a plurality of rows in which the pressure generating chambers  12  are juxtaposed in the first direction X, two rows in one embodiment, are disposed on the flow path forming substrate  10 . Hereinafter, an array direction in which the plurality of rows of the pressure generating chambers  12 , in which the pressure generating chambers  12  are formed in the first direction X, are disposed is referred to as a second direction Y. Further, a direction that is orthogonal to the first direction X and the second direction Y is referred to as a direction of discharge of ink droplets (liquid droplets) or a third direction Z. The flow path forming substrate  10 , the communicating plate  15 , and the nozzle plate  20  are stacked in the third direction Z. 
     In addition, a supply path, which has a smaller opening area than the pressure generating chambers  12  and provides a flow path resistance for ink which flows into the pressure generating chambers  12 , and the like may be disposed on one end portion sides of the pressure generating chambers  12  in the second direction Y on the flow path forming substrate  10 . 
     In addition, the communicating plate  15  and the nozzle plate  20  are sequentially stacked on the one surface side of the flow path forming substrate  10 . In other words, the communicating plate  15  is disposed on the one surface of the flow path forming substrate  10 . The nozzle plate  20  is disposed on the surface side of the communicating plate  15  opposite to the flow path forming substrate  10 . Nozzles  21  are provided in the nozzle plate  20 . 
     Nozzle communicating paths  16 , which allow the pressure generating chambers  12  and the nozzles  21  to communicate with each other, are disposed in the communicating plate  15 . The communicating plate  15  is larger in area than the flow path forming substrate  10 , and the nozzle plate  20  is smaller in area than the flow path forming substrate  10 . When the communicating plate  15  is disposed in this manner, the nozzles  21  of the nozzle plate  20  and the pressure generating chambers  12  are separated. Thus, ink in the pressure generating chambers  12  is unlikely to be affected by thickening caused by the evaporation of moisture in ink that occurs in ink in the vicinity of the nozzles  21 . In addition, the nozzle plate  20  has only to cover openings of the nozzle communicating paths  16  that allow the pressure generating chambers  12  and the nozzles  21  to communicate with each other. Thus the area of the nozzle plate  20  can be relatively small with reduced costs. In one embodiment, a surface to which ink droplets are discharged with the nozzles  21  of the nozzle plate  20  open is referred to as a liquid ejecting surface  20   a.    
     In addition, a first manifold portion  17  and a second manifold portion  18  constitute a part of a manifold  100  and are disposed on or in the communicating plate  15 . 
     The first manifold portion  17  is disposed to penetrate the communicating plate  15  in a thickness direction (stacking direction of the communicating plate  15  and the flow path forming substrate  10 ). 
     In addition, the second manifold portion  18  is disposed to be open to the nozzle plate  20  side of the communicating plate  15 , without completely penetrating the communicating plate  15  in the thickness direction. 
     Furthermore, in the communicating plate  15 , supply communicating paths  19  that communicate with the one end portions of the pressure generating chambers  12  in the second direction Y are disposed independently in or for the respective pressure generating chambers  12 . The supply communicating path  19  allows the second manifold portion  18  and the pressure generating chamber  12  to communicate with each other. In other words, in one embodiment, the supply communicating paths  19 , the pressure generating chambers  12 , and the nozzle communicating paths  16  are disposed as individual flow paths communicating with the nozzles  21  and the second manifold portions  18 . The ink flows from the manifold portion  17  to the second manifold portion  18 , to the supply communicating path  19 , to the pressure chamber  12 , to the nozzle communicating path  16  and can be ejected from the nozzles  21  as ink droplets. 
     A metal such as stainless steel and nickel (Ni), ceramics such as zirconium (Zr), or the like can be used as the communicating plate  15 . It is preferable that the communicating plate  15  employ a material whose linear expansion coefficient is equal to that of the flow path forming substrate  10 . In other words, in a case where a material whose linear expansion coefficient is significantly different from that of the flow path forming substrate  10  is used as the communicating plate  15 , warpage occurs through heating and cooling due to the difference between the linear expansion coefficient of the flow path forming substrate  10  and the linear expansion coefficient of the communicating plate  15 . In one embodiment, the same material, (e.g., silicon single crystal substrate) is used as the communicating plate  15  as well as in the flow path forming substrate  10 . Thus the occurrence of warpage caused by heat, cracks and peeling caused by heat, and the like can be suppressed. 
     The nozzles  21 , which communicate with the pressure generating chambers  12  via the nozzle communicating paths  16 , are formed on the nozzle plate  20 . In other words, the nozzles  21  that eject the same type of liquid (ink) are juxtaposed in the first direction X, and two rows of the nozzles  21  juxtaposed in the first direction X are formed in the second direction Y. 
     In other words, in one embodiment, a nozzle group that is disposed on the liquid ejecting surface  20   a  is a row of the nozzles juxtaposed in the first direction X, and the number of the rows of the nozzles (nozzle groups) disposed in the second direction Y, which is a reference direction, is two. Herein, the nozzle group is not limited to the nozzle group that is juxtaposed linearly in the first direction X. For example, the nozzle group may be a nozzle group that is configured such that the nozzles  21  juxtaposed in the first direction X are alternately arranged at positions shifted in the second direction Y in a so-called zigzag arrangement. In addition, the nozzle group may be configured such that a plurality of the nozzles  21  juxtaposed in the first direction X are arranged in the second direction Y in a shifted manner. In other words, the nozzle group may be configured by using the plurality of nozzles  21  disposed on the liquid ejecting surface  20   a , and the arrangement thereof is not particularly limited. However, in most cases, the direction in which the nozzles  21  are juxtaposed (first direction X) increases in length when the plurality of nozzles  21  (different nozzles) are arranged in high density. In other words, it is usual that the first direction X is a longitudinal direction and the second direction Y is a short direction in the head chip  2 . 
     In addition, the pressure generating chambers  12  are arranged to correspond to the nozzles  21 . Pressure generating units, which generate pressure changes in the ink, are disposed to correspond to the pressure generating chambers  12 . Thus the plurality of pressure generating chambers  12  and a plurality of piezoelectric actuators  130 , which are examples of the pressure generating units, are juxtaposed in the first direction X. A wiring member  121  (described in detail later), which supplies an electrical signal to the plurality of piezoelectric actuators  130  formed in high density, is connected to the piezoelectric actuators  130  by generating a space in a direction of juxtaposition of the piezoelectric actuators  130  on the substrate, that is, the first direction X (longitudinal direction). Accordingly, the width of the sheet-shaped wiring member  121  is arranged in the direction of juxtaposition of the piezoelectric actuators  130 . In other words, when the width direction of the sheet-shaped wiring member  121  is the direction of juxtaposition of the piezoelectric actuators  130 , the connection between the piezoelectric actuators  130  and the wiring member  121  can be performed smoothly even if the piezoelectric actuators  130  are arranged with a high density. 
     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 as the nozzle plate  20 . When a silicon single crystal substrate is used as the nozzle plate  20 , the occurrence of warpage caused by heating and cooling, cracks and peeling caused by heat, and the like can be suppressed since the linear expansion coefficients of the nozzle plate  20  and the communicating plate  15  are equal to each other. 
     A vibrating plate  50  is formed on the surface side of the flow path forming substrate  10  opposite to the communicating plate  15 . In one embodiment, an elastic membrane  51  formed of silicon oxide, which is disposed on the flow path forming substrate  10  side, and an insulator film  52  formed of zirconium oxide, which is disposed on the elastic membrane  51 , are disposed as the vibrating plate  50 . A liquid flow path such as the pressure generating chambers  12  is formed through anisotropic etching of the flow path forming substrate  10  from the one surface side (e.g., surface side where the nozzle plate  20  is bonded), and the other surface of the liquid flow path such as the pressure generating chambers  12  are defined by the elastic membrane  51 . 
     In addition, a first electrode  60 , a piezoelectric layer  70 , and a second electrode  80  are formed to be stacked on the insulator film  52  of the vibrating plate  50  and constitute the piezoelectric actuator  130 . Herein, the piezoelectric actuator  130  refers to a part that has the first electrode  60 , the piezoelectric layer  70 , and the second electrode  80 . In general, any one of the electrodes of the piezoelectric actuator  130  is a common electrode, and the other electrode and the piezoelectric layer  70  are configured through patterning in each of the pressure generating chambers  12 . Herein, a part that is configured by any one of the electrodes that is patterned and the piezoelectric layer  70  and is subjected to piezoelectric distortion caused through voltage application to both of the electrodes is referred to as a piezoelectric active portion. In one embodiment, the first electrode  60  is the common electrode of the piezoelectric actuator  130  and the second electrode  80  is an individual electrode of the piezoelectric actuator  130 . However, this may be reversed for the convenience of a drive circuit and wiring. In the example described above, the first electrode  60  is continuously disposed across the plurality of pressure generating chambers  12 , and thus the first electrode  60  functions as a part of the vibrating plate. However, for example, only the first electrode  60  may serve as the vibrating plate, without being limited thereto, with the elastic membrane  51  and the insulator film  52  described above not disposed. In addition, the piezoelectric actuator  130  itself may serve practically as the vibrating plate. However, the first electrode  60  can be protected by an insulating protective film or the like, so as to prevent conduction between the first electrode  60  and the ink, in a case where the first electrode  60  is disposed directly on the flow path forming substrate  10 . In other words, although an example in which the first electrode  60  is configured to be disposed on the substrate (flow path forming substrate  10 ) via the vibrating plate  50  is described in one embodiment, the first electrode  60  may be disposed directly on the substrate, without being limited thereto, with the vibrating plate  50  not disposed. In other words, the first electrode  60  may serve as the vibrating plate. In other words, to be on the substrate includes a state where another member is interposed (upward) therebetween as well as to be directly on the substrate. 
     Furthermore, one end portions of the lead electrodes  90 , which are drawn out of the vicinity of the end portions on the side opposite to the supply communicating paths  19 , extend onto the vibrating plate  50 , and are formed of gold (Au) or the like, are respectively connected to the second electrodes  80  that are the individual electrodes of the piezoelectric actuators  130 . In addition, the wiring member  121  where a drive circuit  120  (described later) is disposed to drive the piezoelectric actuators  130 , which are the pressure generating units, is connected to the other end portions of the lead electrodes  90 . A flexible sheet-shaped wiring member such as a COF substrate can be used as the wiring member  121 . The drive circuit  120  may not be disposed in the wiring member  121 . In other words, the wiring member  121  is not limited to the COF substrate, and may include FFC, FPC, and the like. 
     The other end portions of the lead electrodes  90  connected to the wiring member  121  are disposed to be juxtaposed in the first direction X. It is possible to extend the other end portions of the lead electrodes  90  to the one end portion side of the flow path forming substrate  10  in the first direction X and juxtapose the other end portions of the lead electrodes  90  in the second direction Y. However, this results in an increase in the size and costs of the recording head because a space is required for the lead electrodes  90  to be routed. In addition, the width of the lead electrodes decreases and electrical resistance increases when multiple piezoelectric actuators  130  are disposed in a high density to increase the number of the nozzles. Accordingly, the piezoelectric actuators  130  may not be in normal driving with the lead electrodes  90  routed and the electrical resistance further increased. In one embodiment, the other end portion sides of the lead electrodes  90  extend between the two rows of the piezoelectric actuators  130  juxtaposed in the first direction X and the other end portions of the lead electrodes  90  are juxtaposed in the first direction X so that the recording head  1  can be compact in size and lower in cost with no increase in size, an increase in electrical resistance can be suppressed in the lead electrodes  90 , and the number of the nozzles can be increased with the multiple piezoelectric actuators  130  disposed in high density. 
     In addition, in one embodiment, the other end portions of the lead electrodes  90  are disposed between the rows of the piezoelectric actuators  130  in the second direction Y and the lead electrodes  90  and the wiring member  121  are connected with each other between the rows of the piezoelectric actuators  130 . Thus the one wiring member  121  can be connected to two rows of the piezoelectric actuators  130  via the lead electrodes  90 . The wiring member  121  is not limited thereto in number, and the wiring member  121  may be disposed in each of the rows of the piezoelectric actuators  130 . When one wiring member  121  is disposed with the two rows of the piezoelectric actuators  130  in one embodiment, a space where the wiring member  121  and the lead electrode  90  are connected with each other can be narrow and the recording head  1  can be compact in size. In a case where the wiring member  121  is disposed in each of the rows of the piezoelectric actuators  130 , it is also possible to extend the lead electrodes  90  to the side opposite to the rows of the piezoelectric actuators  130 . However, in such a configuration, an even wider space is required for the connection of the lead electrode with the wiring member and the number of the areas where the wiring member  121  is drawn out to the case member and the like becomes two, which results in the recording head  1  becoming larger in size. In other words, the two rows of the piezoelectric actuators  130  can be connected at the same time with the one wiring member  121  when the lead electrodes  90  are disposed between the two rows of the piezoelectric actuators  130  in one embodiment. The width direction of the sheet-shaped wiring member  121 , which is connected to the lead electrodes  90  in this manner, is arranged in the first direction X. 
     In addition, the protective substrate  30 , which has 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 side toward the piezoelectric actuators  130 , which are the pressure generating units. The protective substrate  30  includes holding portions  31 , which are spaces in which the piezoelectric actuators  130  are protected. The holding portions  31  are disposed independently in the respective rows configured with the piezoelectric actuators  130  juxtaposed in the first direction X. A thickness-direction through-hole  32  is disposed between the two holding portions  31  (second direction Y). The other end portions of the lead electrodes  90  extend into and are exposed in the through-hole  32 . The lead electrodes  90  and the wiring member  121  are electrically connected with each other in the through-hole  32 . 
     In addition, the case member  40 , which defines the manifolds  100  communicating with the plurality of pressure generating chambers  12  along with the head main body  11 , is fixed to the head main body  11 . The case member  40  has substantially the same shape, in a plan view, as the communicating plate  15  described above, and is bonded to both the protective substrate  30  and the communicating plate  15 . Specifically, the case member  40  has a concave portion  41  with a depth at which the flow path forming substrate  10  and the protective substrate  30  are accommodated to the protective substrate  30  side. The concave portion  41  has an opening area which is larger than that of the surface of the protective substrate  30  bonded to the flow path forming substrate  10 . An opening surface of the concave portion  41  on the nozzle plate  20  side is sealed by the communicating plate  15  in a state where the flow path forming substrate  10  and the like are accommodated in the concave portion  41 . In this manner, a third manifold portion  42 , which holds the liquid by using the case member  40  and the head main body  11 , is defined in an outer circumferential portion of the flow path forming substrate  10 . The first manifold portion  17  and the second manifold portion  18  that are disposed on the communicating plate  15  and the third manifold portion  42  that is defined by the case member  40  and the head main body  11  constitute the manifold  100  in one embodiment. In other words, the manifold  100  includes the first manifold portion  17 , second manifold portion  18 , and the third manifold portion  42 . In addition, the manifolds  100  according to this embodiment are arranged on both outer sides of the two rows of the pressure generating chambers  12  in the second direction Y, and the two manifolds  100  that are disposed on both of the outer sides of the two rows of the pressure generating chambers  12  are disposed independently of each other so as not to communicate in the head chip  2 . In other words, the manifolds  100  are disposed to communicate with the respective rows (rows juxtaposed in the first direction X) of the pressure generating chambers  12  in one embodiment. In other words, a manifold  100  is disposed for each of the nozzle groups. The two manifolds  100  may, however, communicate with each other in one embodiment. 
     In addition, in the case member  40 , an inlet  44  is disposed to communicate with the manifolds  100  and supply ink to the respective manifolds  100 . In this embodiment, the inlet  44  is disposed for each of the manifolds  100 . In other words, provided are the first inlet  44 A that communicates with one of the nozzle groups via one of the manifolds  100  and the second inlet  44 B that communicates with the other one of the nozzle groups via the other one of the manifolds  100 . The first inlet  44 A and the second inlet  44 B are collectively referred to as an inlet  44 . 
     In addition, in one embodiment, the surface side where the drive circuit  120  is disposed is referred to as the second inlet  44 B and the side opposite to the surface where the drive circuit  120  is disposed is referred to as the first inlet  44 A. In other words, the distance between the drive circuit  120  and the second inlet  44 B may be shorter than the distance between the drive circuit  120  and the first inlet  44 A. 
     In addition, a connection port  43 , which communicates with the through-hole  32  of the protective substrate  30  for the wiring member  121  to be inserted, is disposed in the case member  40 . In other words, the first inlet  44 A and the second inlet  44 B are disposed on both sides of the connection port  43  (through-hole  32 ) in the second direction Y. In other words, one end portion of the wiring member  121  is connected to the piezoelectric actuators  130 , which are the pressure generating units, via the lead electrodes  90  between the first inlet  44 A and the second inlet  44 B in the second direction Y, which is the reference direction. The other end portion of the wiring member  121  extends in the direction opposite to the penetration directions of the through-hole  32  and the connection port  43 , that is, the third direction Z, which is the direction of discharge of ink droplets. 
     Examples of materials that can be used in the case member  40  include resins and metals. When a resinous material is molded as the case member  40 , mass production is available at a low cost. 
     In addition, a compliance substrate  45  may be disposed on a surface of the communicating plate  15  where the first manifold portion  17  and the second manifold portion  18  are open. The compliance substrate  45  has substantially the same size, in a plan view, as the communicating plate  15  described above. A first exposing opening portion  45   a  that exposes the nozzle plate  20  is disposed in the compliance substrate  45 . The openings of the first manifold portion  17  and the second manifold portion  18  on the liquid ejecting surface  20   a  side are sealed in a state where the compliance substrate  45  exposes the nozzle plate  20  by using the first exposing opening portion  45   a.    
     In other words, the compliance substrate  45  defines a part of the manifold  100 . The compliance substrate  45  has a sealing film  46  and a fixed substrate  47  in this embodiment. The sealing film  46  is formed of a flexible and film-shaped thin film (for example, a thin film with a thickness of 20 μm or less which is formed of polyphenylene sulfide (PPS) or the like), and the fixed substrate  47  is formed of a hard material such as a metal, examples of which include stainless steel (SUS). An area of the fixed substrate  47  facing the manifold  100  is an opening portion  48  that is completely removed in the thickness direction, and thus one surface of the manifold  100  is a compliance portion  49  that is a flexible portion and the one surface of the manifold is sealed only by the flexible sealing film  46  in one example. In one embodiment, one compliance portion  49  is disposed to correspond to one manifold  100 . In other words, the number of the manifolds  100  disposed is two, and thus the number of the compliance portions  49  is two, which are disposed on both sides in the second direction Y across the nozzle plate  20 . 
     When ink is ejected, ink is introduced via the inlet  44  and inner portions of the flow paths reaching the nozzles  21  from the manifolds  100  are filled with ink in the first head chip  2 A having the configuration described herein. Then, a voltage is applied to the respective piezoelectric actuators  130 , which correspond to the pressure generating chambers  12 , according to a signal from the drive circuit  120  so that the vibrating plate  50  is subjected to a bending deformation along with the piezoelectric actuators  130 . This results in an increase in the pressure in the pressure generating chambers  12 , and ink droplets are ejected from the predetermined nozzles  21 . 
     The first head chip  2 A has been described as an example of the head chip in one embodiment, but the invention is not particularly limited thereto. The recording head  1  may include the first head chip  2 A and a second head chip  2 B that has substantially the same structure as the first head chip  2 A described above but with the manifolds  100  divided into three in the first direction X in one example. Hereinafter, the first head chip  2 A and the second head chip  2 B are collectively referred to as the head chip  2 . Herein, the second head chip  2 B, which is mounted on the ink jet type recording head  1  according to this embodiment, will be described with reference to  FIG. 4 .  FIG. 4  is a plan view illustrating an example of the second head chip. 
     In the second head chip  2 B, the manifolds  100  are disposed on both sides of the nozzles  21  in the second direction Y. In addition, the manifolds  100  that are disposed on both of the sides in the second direction Y are respectively divided into a plurality of the manifolds  100  in the first direction X, divided into three in one embodiment. In one embodiment, a total of six manifolds  100  are disposed in the second head chip  2 B. In addition, the compliance portion  49  (opening portion  48 ) is disposed in each of the partitioned manifolds  100 . Furthermore, the inlet  44  is disposed in each of the manifolds  100 . In other words, the second head chip  2 B according to this embodiment has two rows of the three manifolds  100  juxtaposed in the first direction X which are disposed in the second direction Y. The inlet  44  is disposed in a central portion of each of the manifolds  100  in the first direction X. Accordingly, two rows of the three inlets  44  juxtaposed in the first direction X are disposed in the second direction Y. In one embodiment, as in the first head chip  2 A described above, one of the inlets  44  in the second direction Y is referred to as a first inlet  44 A, and the other inlet  44  is referred to as a second inlet  44 B. In other words, in the second head chip  2 B, the one end portion of the wiring member  121  (not illustrated) is connected to the piezoelectric actuators  130  (not illustrated), which are the pressure generating units, via the lead electrodes  90  between the first inlet  44 A and the second inlet  44 B in the second direction Y, which is the reference direction, as in the first head chip  2 A described above. The other end portion of the wiring member  121  extends in the direction opposite to the penetration directions of the through-hole  32  and the connection port  43 , that is, the third direction Z, which is the direction of discharge of ink droplets. The basic configuration of the second head chip  2 B is the same as that of the first head chip  2 A and redundant description is omitted. 
     The ink jet type recording head, which is an example of the liquid ejecting head according to this embodiment including the first head chip  2 A and the second head chip  2 B, will be described in detail.  FIG. 5  is an exploded perspective view of an example of the ink jet type recording head, which is an example of the liquid ejecting head according to one embodiment of the invention.  FIG. 6  is a sectional view of the ink jet type recording head.  FIG. 7  is an enlarged sectional view of a main part. 
     As illustrated in the drawings, the recording head  1  includes the two head chips  2  (the first head chip  2 A and the second head chip  2 B) that discharge ink (liquid) as ink droplets (liquid droplets) from the nozzles, a flow path member  200  that holds the two head chips  2  and supplies ink (liquid) to the head chips  2 , a wiring substrate  300  that is held by the flow path member  200 , and a cover head  400  that is disposed on the liquid ejecting surface  20   a  sides of the head chips  2 . 
     The flow path member  200  includes an upstream flow path member  210  where an upstream flow path  500  is disposed, a downstream flow path member  220  where a downstream flow path  600  is disposed, and a seal member  230  that connect the upstream flow path  500  with the downstream flow path  600  in a sealed state. 
     In one embodiment, a first upstream flow path member  211 , a second upstream flow path member  212 , and a third upstream flow path member  213  are stacked in the third direction Z (direction orthogonal to the first direction X and the second direction Y), in which ink droplets are discharged, to constitute the upstream flow path member  210 . However, the upstream flow path member  210  is not particularly limited thereto, and may be a single member or may be configured by using a plurality of members (e.g., two or more members). In addition, a direction in which the plurality of members constituting the upstream flow path member  210  are stacked is not particularly limited, and may be the first direction X or the second direction Y as well. 
     The first upstream flow path member  211  includes connection portions  214 , which may be connected to a liquid holding portion, such as an ink tank and an ink cartridge where ink (liquid) is held, on the surface side opposite to the downstream flow path member  220 . In one embodiment, the connection portions  214  protrude in a needle shape. The liquid holding portion such as the ink cartridge may be directly connected to the connection portions  214 , and the liquid holding portion such as the ink tank may be connected via a supply tube such as a tube. 
     First upstream flow paths  501 , to which ink is supplied from the liquid holding portion, are disposed in the connection portions  214 . In addition, guide walls  215  are disposed around the connection portions  214  of the first upstream flow path member  211  so as to position the liquid holding portion in one example. 
     Flow paths that extend in the third direction Z to correspond to second upstream flow paths  502  (described later), flow paths that extend in planes including the directions orthogonal to the third direction Z, that is, the first direction X and the second direction Y to correspond to second upstream flow paths  502 , and the like constitute the first upstream flow paths  501 . 
     The second upstream flow path member  212  is fixed to the surface side of the first upstream flow path member  211  opposite to the connection portions  214  and includes the second upstream flow paths  502  which communicate with the first upstream flow paths  501 . In addition, first liquid reservoir portions  502   a , which are widened to be larger in inner diameter than the first upstream flow paths  501 , are disposed on the downstream side (third upstream flow path member  213  side) of the second upstream flow paths  502 . 
     The third upstream flow path member  213  is disposed on the side of the second upstream flow path member  212  opposite to the first upstream flow path member  211 . In addition, third upstream flow paths  503  are disposed in the third upstream flow path member  213 . Opening parts of the third upstream flow paths  503  on the second upstream flow path  502  side are second liquid reservoir portions  503   a , which are widened to correspond to the first liquid reservoir portions  502   a . Filters  216  may be disposed at opening parts (between the first liquid reservoir portions  502   a  and the second liquid reservoir portions  503   a ) of the second liquid reservoir portions  503   a  so as to remove bubbles and foreign substances contained in ink. As such, ink that is supplied from the second upstream flow paths  502  (first liquid reservoir portions  502   a ) is supplied to the third upstream flow paths  503  (second liquid reservoir portions  503   a ) via the filters  216 . 
     In addition, the third upstream flow path  503  branches into two on the further downstream side (side opposite to the second upstream flow path) than the second liquid reservoir portion  503   a , and the third upstream flow path  503  is disposed to be open, as a first outlet  504 A and a second outlet  504 B, on the surface of the third upstream flow path member  213  on the downstream flow path member  220  side. 
     In other words, the upstream flow path  500  that corresponds to one of the connection portions  214  includes the first upstream flow path  501 , the second upstream flow path  502 , and the third upstream flow path  503 , and the upstream flow path  500  is open as the two outlets  504  (the first outlet  504 A and the second outlet  504 B) on the downstream flow path member  220  side. In other words, the two outlets  504  (the first outlet  504 A and the second outlet  504 B) are disposed to communicate with the common flow path. Thus, the third upstream flow path  503  may split into two paths that include the first and second outlets  504 A and  504 B. 
     In addition, first protruding portions  217  (see  FIG. 7 ), which protrude toward the downstream flow path member  220  side, are disposed on the downstream flow path member  220  side of the third upstream flow path member  213 . The first protruding portion  217  is disposed in each of the branching third upstream flow paths  503 , and the outlets  504  are disposed to be open at respective tip end surfaces of the first protruding portions  217 . 
     The first upstream flow path member  211 , the second upstream flow path member  212 , and the third upstream flow path member  213  where the upstream flow paths  500  are formed in this manner are integrally stacked by using, for example, an adhesive, welding, and the like. The first upstream flow path member  211 , the second upstream flow path member  212 , and the third upstream flow path member  213  can also be fixed by using a screw, a clamp, and the like. However, bonding may be performed by using an adhesive, welding, and the like so as to suppress the leakage of ink (liquid) from connection parts reaching the third upstream flow paths  503  from the first upstream flow paths  501 . 
     In one embodiment, four connection portions  214  are disposed in one upstream flow path member  210  and four independent upstream flow paths  500  are disposed in one upstream flow path member  210 . Because each of the upstream flow paths  500  branches into two on the downstream flow path member  220  side, the total number of the inlets  44  disposed is eight. A configuration in which the upstream flow path  500  branches into two further downstream (downstream flow path member  220  side) than the filter  216  has been illustrated as an example in one embodiment. However, embodiments of the invention are not limited thereto, and the upstream flow path  500  may branch into three or more paths on the further downstream side than or from the filter  216 . In addition, the one upstream flow path  500  may not branch further downstream than the filter  216 . 
     The downstream flow path member  220  includes the downstream flow path  600  that is connected to the upstream flow path  500 . A second protruding portion  221 , which protrudes to the upstream flow path member  210  side, is disposed in the downstream flow path member  220 . The second protruding portion  221 , which corresponds to the first protruding portion  217 , is disposed in or for each of the upstream flow paths  500 , that is, in each of the first protruding portions  217 . In addition, one end of the downstream flow path  600  is disposed to be open to a tip end surface of the second protruding portion  221 , and the other end of the downstream flow path  600  is disposed to be open to the surface on the side opposite to the upstream flow path member  210  in the third direction Z. In one embodiment, the downstream flow path  600  corresponds to the connection flow path described in the scope of the claims. The downstream flow path  600  is disposed independently at each of the outlets  504  of the respective upstream flow paths  500 . In other words, one upstream flow path  500  may include two outlets (a first outlet  504 A and second outlet  504 B). Thus the downstream flow path  600  connected to the first outlet  504 A is a first connection flow path  600 A and the downstream flow path  600  connected to the second outlet  504 B is a second connection flow path  600 B. Hereinafter, the first connection flow path  600 A and the second connection flow path  600 B are collectively referred to as the connection flow path  600 . 
     In addition, the plurality of head chips  2 , the two head chips  2  in one embodiment, are fixed to the surface side of the downstream flow path member  220  opposite to the upstream flow path member  210 . Herein, the nozzle groups (row of the nozzles) are formed to be juxtaposed in the second direction Y as described above in one of the head chips  2 , and the two head chips  2  are disposed to be juxtaposed in the second direction Y in the recording head  1 . Hereinafter, the first direction X, the second direction Y, and the third direction Z of the head chip  2  respectively illustrate the same directions as the first direction X, the second direction Y, and the third direction Z of the recording head  1 . The two head chips  2  that are disposed in the recording head  1  according to one embodiment are formed from the first head chip  2 A and the second head chip  2 B as described above. The two inlets  44  (the first inlet  44 A and the second inlet  44 B) are disposed in the first head chip  2 A, and the six inlets  44  (three being the first inlets  44 A and three being the second inlets  44 B) are disposed in the second head chip  2 B. The downstream flow path  600  (the first connection flow path  600 A and the second connection flow path  600 B) that is disposed in the downstream flow path member  220  is disposed to be open to match the position where each of the inlets  44  is open. 
     Herein, in one embodiment, the first head chip  2 A is arranged such that the first inlet  44 A is on the second head chip  2 B side in the second direction Y. Likewise, the second head chip  2 B is arranged such that the first inlet  44 A is on the first head chip  2 A side in the second direction Y. The first connection flow path  600 A that is the downstream flow path  600  connects the first outlet  504 A with the first inlet  44 A, and the second connection flow path  600 B connects the second outlet  504 B with the second inlet  44 B. Accordingly, the first connection flow path  600 A that connects the flow path of the first head chip  2 A is arranged on the further second head chip  2 B side than the second connection flow path  600 B. Likewise, the first connection flow path  600 A that connects the flow path of the second head chip  2 B is arranged on the further first head chip  2 A side than the second connection flow path  600 B. 
     In one embodiment, the first connection flow path  600 A is formed in a linear shape in the third direction Z. In addition, the second connection flow path  600 B has an extending flow path that extends from the second inlet  44 B toward the second direction Y which is the reference direction separated from the first inlet  44 A. Specifically, the second connection flow path  600 B has a first flow path  601  that is connected to the upstream flow path  500  (second outlet  504 B), a second flow path  602  that is an extending flow path which is connected to the first flow path  601 , and a third flow path  603  that connects the second flow path  602  and the second inlet  44 B with each other. 
     The first flow path  601  and the third flow path  603  are disposed in a linear shape in the third direction Z. The first flow path  601  and the third flow path  603  may be disposed in the direction intersecting with the third direction Z as well. 
     In addition, the second flow path  602 , which is an extending flow path, extends toward or in the second direction Y. Herein, the extension of the second flow path  602  (extending flow path) toward the second direction Y means that a component (vector) toward the second direction Y is present in the direction of extension of the second flow path  602 . The direction of extension of the second flow path  602  is the direction in which ink (liquid) in the second flow path  602  flows. Accordingly, the second flow path  602  includes those disposed in the horizontal direction (direction orthogonal to the third direction Z) and those disposed to intersect with the third direction Z and the horizontal direction (in-plane direction of the first direction X and the second direction Y). In one embodiment, the first flow path  601  and the third flow path  603  are disposed in the third direction Z and the second flow path  602  is disposed in the horizontal direction (second direction Y). 
     The second connection flow path  600 B is not limited thereto, and a flow path other than the first flow path  601 , the second flow path  602 , and the third flow path  603  may also be present. The first flow path  601  or the third flow path  603  may not be disposed. In addition, a configuration in which only the second flow path  602  is the extending flow path has been described in the example described above, but, without being limited thereto, two flow paths that have components in the second direction Y may also be extending flow paths. However, the number of the extending flow paths disposed may only be one (only the second flow path  602 ), rather than two, because bubbles are likely to remain. In this case, bubble dischargeability can be improved. 
     In addition, the second connection flow path  600 B, which extends in a linear shape, may be disposed to be inclined at an angle to the third direction Z. In other words, the entire second connection flow path  600 B may be the extending flow path. However, a space exclusive to the second connection flow path  600 B can be saved and the recording head  1  can be compact in size when the vertical first flow path  601 , the vertical third flow path  603 , and the horizontal second flow path  602  are disposed. 
     When the second flow path  602 , which is an extending flow path, is disposed in the second connection flow path  600 B in this manner, a gap in the second direction Y between an area where the first connection flow path  600 A and the first outlet  504 A communicate with each other and an area where the second connection flow path  600 B and the second outlet  504 B communicate with each other can be wider than a gap between the first inlet  44 A and the second inlet  44 B, without widening a gap in the second direction Y between the first inlet  44 A and the second inlet  44 B of the head chip  2 . 
     In this manner, the wiring member  121  and the wiring substrate  300  can be connected with ease between the first connection flow path  600 A and the second connection flow path  600 B, with no increase in the size of the head chips  2 , which will be described in detail later. 
     In addition, the distance (in the second direction Y) between the first outlet  504 A and the second outlet  504 B can be increased when the second flow path  602 , which is an extending flow path, is disposed in the second connection flow path  600 B. As such, a large area for the filter  216  (between the first liquid reservoir portion  502   a  and the second liquid reservoir portion  503   a ), which is the common flow path, can be ensured. Herein, flow path resistance increases since the filter  216  is disposed. Thus the filter  216  is required to have a certain degree of size to ensure a flow rate. However, the area where the filter  216 , which is the common flow path allowing the first inlet  44 A and the second inlet  44 B to communicate, is disposed decreases in a case where the first inlet  44 A and the second inlet  44 B are close to each other due to a decrease in the size of a head chip  2  and the extending flow path is not disposed in the second connection flow path  600 B. In other words, the area where the filter  216  is disposed can also be ensured with ease and the disadvantage described above can be addressed in a case where the head chip  2  is large and the distance between the first inlet  44 A and the second inlet  44 B is long (manifolds  100  are far from each other). In one embodiment, the extending flow path (second flow path  602 ) is disposed in the second connection flow path  600 B. Thus a state where the head chip  2  is compact in size can be ensured, and a large area of the filter  216  can be ensured without separating the first inlet  44 A and the second inlet  44 B from each other. 
     The connection flow path  600  is formed, for example, from a first downstream flow path member  222  and a second downstream flow path member  223 . The first flow path  601  is formed in the first downstream flow path member  222 , and the second flow path  602  is formed between the first downstream flow path member  222  and the second downstream flow path member  223 . In addition, the third flow path  603  is formed in the second downstream flow path member  223 . In this manner, the second flow path  602 , which is an extending flow path, can be formed with ease in the downstream flow path member  220 . 
     In addition, in one embodiment, the first inlet  44 A of the first head chip  2 A is disposed on the second head chip  2 B side, and thus the second connection flow path  600 B of the first head chip  2 A is arranged on the side opposite to the second head chip  2 B. Likewise, the first inlet  44 A of the second head chip  2 B is on the first head chip  2 A side, and thus the second connection flow path  600 B of the second head chip  2 B is arranged on the side opposite to the first head chip  2 A. In this manner, the first connection flow path  600 A, which is linearly disposed in the third direction Z, is arranged inside the two head chips  2  in one embodiment. Accordingly, the two head chips  2  can be arranged close to each other, without separating the two head chips  2  in the second direction Y, and the recording head  1  can be compact in size. 
     In addition, a wiring member insertion hole  224  is disposed between the first connection flow path  600 A and the second connection flow path  600 B for the wiring member  121  to be inserted therein. The wiring member insertion hole  224  communicates with the connection port  43  of the head chip  2  and allows the wiring member  121  to be inserted from the head chip  2  side to the upstream flow path member  210  side. The wiring member insertion hole  224  is disposed as an opening having substantially the same width as the width of the head chip  2  in the first direction X. 
     The seal member  230 , which is a joint connecting (linking) the upstream flow paths  500  and the downstream flow paths  600  with each other, is disposed between the upstream flow path member  210  and the downstream flow path member  220 . 
     The seal member  230  has liquid resistance to a liquid, such as ink, used in the recording head  1  and an elastically deformable material (elastic material), such as rubber and an elastomer, can be used in the seal member  230 . The seal member  230  includes a tube-shaped part  231  in each of the downstream flow paths  600 . A communicating flow path  232  is disposed in the tube-shaped part  231 . The upstream flow path of the upstream flow path member  210  and the downstream flow path of the downstream flow path member  220  communicate with each other via the communicating flow path  232  of the tube-shaped part  231 . 
     An annular-shaped first concave portion  233 , into which the first protruding portion  217  is inserted, is disposed in an end surface of the tube-shaped part  231  on the upstream flow path member  210  side. In addition, a second concave portion  234 , into which the second protruding portion  221  is inserted, is disposed in an end surface of the tube-shaped part  231  on the downstream flow path member  220  side. The tube-shaped part  231  is held, in a state where a predetermined pressure is applied in the third direction Z, between the tip end surface of the first protruding portion  217  inserted into the first concave portion  233  and the tip end surface of the second protruding portion  221  inserted into the second concave portion  234 . In this manner, the upstream flow path  500  and the communicating flow path  232  are connected in a state where pressure is applied in the third direction Z to the seal member  230 , and the communicating flow path  232  and the downstream flow path  600  are connected in a state where pressure is applied in the third direction Z to the seal member  230 . Accordingly, the upstream flow path  500  and the downstream flow path  600  communicate in a state where the upstream flow path  500  and the downstream flow path  600  are sealed via the communicating flow path  232 . In addition, in one embodiment, the tube-shaped part  231  (communicating flow path  232 ) is included in the connection flow path  600 . 
     The first protruding portion  217  may extend to the downstream flow path member  220  side beyond the wiring substrate  300  (described in detail later). In this case, the flow path beyond the wiring substrate  300  is included in the connection flow path  600 . In other words, the connection flow path  600  is a flow path that connects the second liquid reservoir portion  503   a  with the inlet  44 , and may be disposed beyond the wiring substrate  300 . 
     A plurality of the tube-shaped parts  231  according to one embodiment are connected on the upstream flow path member  210  side, by a plate-shaped part, so that the plurality of tube-shaped parts  231  are integrated with respect to the one upstream flow path member  210 . In one embodiment, the eight outlets  504  of the upstream flow path  500  are disposed in the one upstream flow path member  210 , and thus the eight tube-shaped parts  231  are integrally disposed in the seal member  230 . 
     In addition, in one embodiment, pressure is applied in the third direction Z to the seal member  230  to connect the upstream flow path  500  and the downstream flow path  600  with each other. However, embodiments of the invention are not limited thereto. For example, the flow paths may be connected by bringing an inner wall surface of the tube-shaped part  231  and an outer circumferential surface of at least one of the first protruding portion  217  and the second protruding portion  221  into close contact with each other, that is, by applying pressure in the plane direction of the first direction X which is a radial direction and the second direction Y. 
     In addition, the wiring substrate  300 , to which the wiring member  121  is connected, is disposed between the seal member  230  and the downstream flow path member  220 . Insertion holes, into which the wiring member  121  and the tube-shaped part  231  of the seal member  230  are inserted, are disposed in the wiring substrate  300 . Disposed in one embodiment are a first insertion hole  301 , which is an opening portion where the tube-shaped part  231  disposed to correspond to the first connection flow path  600 A and the wiring member  121  are inserted, and a second insertion hole  302 , which is an opening portion where the tube-shaped part  231  disposed to correspond to the second connection flow path  600 B is inserted. 
     The first insertion hole  301  may be formed to have a size that allows two wiring members  121  to be inserted. The four first connection flow paths  600 A of the two head chips  2  are disposed between the two wiring members  121  (see e.g.,  FIG. 6 ). Thus the tube-shaped part  231  of the seal member  230  which corresponds to the first connection flow path  600 A is inserted into the first insertion hole  301  with the wiring member  121 . 
     In addition, the second insertion hole  302  corresponds to the second connection flow path  600 B. The second insertion hole  302  is disposed to accommodate each of the tube-shaped parts  231  and is disposed to correspond to the second connection flow path  600 B. 
     In other words, the wiring substrate  300  is arranged, on the side opposite to the first inlet  44 A from the second flow path  602  which is the extending flow path of the second connection flow path  600 B in the third direction Z, to extend in the second direction Y beyond the second connection flow path  600 B from between the first connection flow path  600 A and the second connection flow path  600 B. In one embodiment, one wiring substrate  300  that is common to the two head chips  2  may be disposed. Accordingly, the wiring substrate  300  extends in the second direction Y from the side of the second connection flow path  600 B, which is disposed for the first head chip  2 A, opposite to the first connection flow path  600 A to the side of the second connection flow path  600 B for the second head chip  2 B opposite to the first connection flow path  600 A through between the first connection flow path  600 A for the first head chip  2 A and the first connection flow path  600 A for the second head chip  2 B. The wiring substrate  300  is not limited thereto and may be disposed, in a divided manner, in each of the head chips  2 . Even in this case, the wiring substrate  300  that is disposed in each of the head chips  2  is arranged to extend in the second direction Y beyond the second connection flow path  600 B from between the first connection flow path  600 A and the second connection flow path  600 B, and thus the wiring member  121  and the wiring substrate  300  can be connected with ease. When the one common wiring substrate  300  is used in the two head chips  2 , the number of components can be reduced and the assembly operation can be simplified. 
     In addition, the first insertion hole  301  can be disposed with a wider opening area when the two wiring members  121  and the two first connection flow paths  600 A are inserted into the first insertion hole  301 , which is one of opening portions of the wiring substrate  300 , than in a case where a plurality of the opening portions are disposed. As such, the wiring member  121  can be drawn out with ease from the first insertion hole  301  and assemblability can be improved. In other words, the wiring member  121  has to be drawn out from the head chip  2  side of the wiring substrate  300  to the upstream flow path member  210  side so that the wiring member  121  and the wiring substrate  300  are connected to each other. It is difficult to insert the wiring substrate  300 , which has flexibility, into a narrow opening. 
     In addition, the wiring member  121  that is inserted into the first insertion hole  301 , which is one of the opening portions of the wiring substrate  300 , is in an upright state in the third direction Z and the two first connection flow paths  600 A, which are inserted into the first insertion hole  301 , are disposed in a linear shape in the third direction Z. As such, the opening area of the first insertion hole  301  can be as small as possible. 
     In addition, on the upstream flow path member  210  side surface of the wiring substrate  300 , terminal portions  310 , to which the wiring member  121  is connected, are disposed in open edge portions on both sides of the first insertion hole  301  in the second direction Y. The terminal portions  310  are formed over a width that is substantially equal to the width of the wiring member  121  in the first direction X. The terminal portion  310  is formed not beyond the second insertion hole  302  to which the tube-shaped part  231 , which is disposed to correspond to the second connection flow path  600 B, is inserted. In other words, the terminal portion  310  is disposed between the first connection flow path  600 A (first insertion hole  301 ) and the second connection flow path  600 B (second insertion hole  302 ). 
     The other end portion of the wiring member  121  is inserted into the first insertion hole  301  of the wiring substrate  300  from the downstream flow path member  220  side. The other end portion of the wiring member  121  that is inserted into the first insertion hole  301  in this manner is bent in the second direction Y on the surface (surface on the upstream flow path member  210  side) of the wiring substrate  300  and is connected to the terminal portions  310  on the surface of the wiring substrate  300  on the upstream flow path member  210  side. In other words, the surface of the connection between the wiring member  121  and the wiring substrate  300  (terminal portions  310 ) is in the direction along the surface of the wiring substrate  300 , that is, in the in-plane direction of the first direction X and the second direction Y. 
     When the other end portion of the wiring member  121  is bent in this manner, the wiring member  121  can have a low back and the recording head  1  can be compact in size in the third direction Z. 
     A direction in which the wiring member  121  is bent is the second direction Y which is separated from the first inlet  44 A in this embodiment. In other words, the other end portion of the wiring member  121  and the wiring substrate  300  are connected in an area overlapping between the first connection flow path  600 A and the second connection flow path  600 B (second direction Y) in the third direction Z. 
     When the other end portion of the wiring member  121  is bent in the second direction Y separated from the first inlet  44 A in this manner, the space (connection area) connecting the wiring member  121  with the wiring substrate  300  and the space that is widened in the second direction Y by the second flow path  602 , which is the extending flow path of the second connection flow path  600 B, can be shared. In other words, the area connecting the wiring member  121  with the wiring substrate  300  can be ensured when the second flow path  602 , which is an extending flow path, is disposed in the second connection flow path  600 B. In this manner, the recording head  1  can be compact in size in the second direction Y. 
     In a case where the direction in which the wiring member  121  is bent is the second direction Y separated from the second inlet  44 B, the terminal portion  310  (area of the wiring substrate  300  where the terminal portion  310  is disposed) is required between the two wiring members  121  and a space is required so that the terminal portions  310  of the two wiring members  121  do not interfere with each other, and thus the size of the wiring substrate  300  in the second direction Y increases and the size of the recording head  1  increases. In addition, in a case where the other end portion of the wiring member  121  is bent in the second direction Y separated from the first inlet  44 A and is connected to the wiring substrate  300  with no extending flow path disposed, the gap in the second direction Y between the first inlet  44 A and the second inlet  44 B of the head chip  2  has to be widened so as to ensure the space where the terminal portion  310  is disposed, and thus the size of the head chip  2  increases and the size of the recording head  1  increases. In other words, in one embodiment, the second flow path  602 , which is an extending flow path extending in the second direction Y, is disposed in the second connection flow path  600 B and the other end portion of the wiring member  121  is bent in the second direction Y separated from the first inlet  44 A and is connected with the wiring substrate  300  so that the wiring member  121  and the wiring substrate  300  can be connected at a position overlapping in the third direction Z between the first connection flow path  600 A and the second connection flow path  600 B without widening the gap between the first inlet  44 A and the second inlet  44 B of the head chip  2 . 
     In addition, the wiring substrate  300  is disposed at the position overlapping in the third direction Z between the first connection flow path  600 A and the second connection flow path  600 B, and thus the wiring member  121  does not have to be drawn outside the downstream flow path  600  from between the first connection flow path  600 A and the second connection flow path  600 B. Disconnection or the like, which is attributable to excessive bending of the sheet-shaped wiring member  121 , can be suppressed. 
     In addition, the wiring member  121  and the wiring substrate  300  are connected on the surface of the wiring substrate  300  on the upstream flow path member  210  side such that the wiring member  121  is connected to the terminal portion  310  along the surface of the wiring substrate  300 . In other words, the wiring member  121  and the terminal portion  310  of the wiring substrate  300  are connected to overlap in the third direction Z. 
     When the wiring member  121  and the terminal portion  310  of the wiring substrate  300  are connected at the position overlapping in the third direction Z, the connection between the wiring member  121  and the wiring substrate  300  can be performed with ease from the one surface (upstream flow path member  210 ) side and assemblability can be improved. In other words, the assembly can be facilitated and the wiring member  121  and the wiring substrate  300  can be connected with ease when the head chip  2  is fixed to the downstream flow path member  220  and the wiring member  121  is inserted into the wiring member insertion hole  224  and then the end portion of the wiring member  121  inserted into the wiring member insertion hole  224  is connected to the wiring substrate  300 . For example, the wiring member  121  and the wiring substrate  300  are required to be connected in advance and then the head chip  2  is required to be fixed to the downstream flow path member  220  in order to connect the wiring member  121  with the wiring substrate  300  on the surface of the wiring substrate  300  on the downstream flow path member  220  side. In a case where the assembly is performed through this process, the wiring member  121  has to be lengthened so that the connected state can be maintained between the wiring member  121  and the wiring substrate  300  even in a state where the head chip  2  and the downstream flow path member  220  are not fixed, which results in high costs. In addition, when the head chip  2  and the downstream flow path member  220  are fixed, deflection occurs in the lengthened wiring member  121 , the wiring on the wiring member  121  is subjected to damage due to contact with other members, and inconvenience such as breaking of the wiring or a short circuit may occur. In one embodiment, the wiring member  121  and the wiring substrate  300  are connected on the surface of the wiring substrate  300  on the upstream flow path member  210  side so that the wiring member  121  and the terminal portion  310  of the wiring substrate  300  overlap in the third direction Z. As a result, deflection is unlikely to occur after the assembly of the wiring member  121  and the wiring member  121  can be disposed at the shortest distance (length) at which the head chip  2  and the wiring substrate  300  are linked. Accordingly, the costs can be reduced. 
     Furthermore, in one embodiment, the second connection flow paths  600 B of the two head chips  2  are arranged on an outer side in the second direction Y, and thus the gap in the second direction Y between the two head chips  2  can be narrowed and the recording head  1  can be compact in size. 
     In addition, in one embodiment, the wiring member  121  is arranged such that the surface side where the drive circuit  120  is disposed is the second inlet  44 B and the side opposite to the surface where the drive circuit  120  is disposed is the first inlet  44 A as described above. In other words, the distance between the drive circuit  120  and the second inlet  44 B is shorter than the distance between the drive circuit  120  and the first inlet  44 A. The drive circuit  120  is arranged in the space between the wiring substrate  300  and the downstream flow path member  220 . Herein, since the drive circuit  120  has a predetermined thickness, the width of the connection port  43  of the case member  40  in the second direction Y has to be increased for the case member  40  to be arranged in the drive circuit  120 . This results in an increase in the size of the head chip  2  caused by an increase in the size of the case member  40 . Accordingly, it is preferable that the drive circuit  120  be disposed in the space between the wiring substrate  300  and the downstream flow path member  220 . In one embodiment, the space where the drive circuit  120  is arranged (space between the wiring substrate  300  and the downstream flow path member  220 ) and the space where the second flow path  602 , which is an extending flow path, is widened (connection area between the wiring member  121  and the wiring substrate  300 ) can be shared, and thus the recording head  1  can be space-saving and can be compact in size. 
     When the drive circuit  120  is arranged on the first inlet  44 A side, the space between the wiring substrate  300 , where the drive circuit  120  is arranged, and the downstream flow path member  220  is required on the first inlet  44 A side and the widths of the two head chips  2  in the second direction Y have to be widened, which results in an increase in the size of the recording head  1 . In other words, in one embodiment, the drive circuit  120  is disposed on the second inlet  44 B side, and thus no space is required on the first inlet  44 A side for the drive circuit  120  to be arranged. Thus, the gap between the two head chips  2  can be narrowed, and the recording head  1  can be compact in size. 
     In addition, noise resistance can be improved, signal distortion can be suppressed, and heat loss can be suppressed since the drive circuit  120  can be arranged close to the piezoelectric actuators  130 . 
     Wiring (not illustrated), electronic components (not illustrated), and the like are mounted on the wiring substrate  300 , and the wiring that is connected to the terminal portions  310  is connected to connectors  320  that are disposed on both end portion sides in the second direction Y. External wiring (not illustrated) is connected to the connectors  320 . A connector connection port  225  that exposes the connectors  320  is disposed in the downstream flow path member  220 , and the external wiring is connected to the connectors  320  that are exposed by the connector connection port  225 . 
     A method for fixing the flow path member  200  and head chips  2  is not particularly limited, and examples thereof may include adhesion by using an adhesive and fixing by using a screw. However, fixing via a seal member formed of an elastic material is difficult because the head chips  2  are small in size and a plurality of the head chips  2  have to be mounted on the single flow path member  200 . Accordingly, the head chips  2  and the flow path member  200  may be adhered using an adhesive. 
     In addition, the cover head  400  is disposed on the surface side of the flow path member  200  where the head chip  2  is disposed. In one embodiment, the cover head  400  has a sufficient size to cover the plurality of head chips  2 . In addition, a second exposing opening portion  401 , which exposes the nozzles  21 , is disposed in the cover head  400 . In one embodiment, the second exposing opening portion  401  has a sufficient size to expose the nozzle plate  20 , that is, an opening substantially the same as the first exposing opening portion  45   a  of the compliance substrate  45 . 
     The cover head  400  is bonded to the surface side of the compliance substrate  45  opposite to the communicating plate  15  and seals the space on the side of the compliance portion  49  opposite to the flow path (manifold  100 ). When the compliance portion  49  is covered by the cover head  400  in this manner, breakage of the compliance portion  49  attributable to contact with a recording medium such as paper can be suppressed. In addition, attachment of ink (liquid) to the compliance portion  49  can be suppressed, ink (liquid) attached to a surface of the cover head  400  can be wiped with, for example, a wiper blade, and contamination of the recording medium by ink attached to the cover head  400  or the like can be suppressed. Although not particularly illustrated, a space between the cover head  400  and the compliance portion  49  is open to the atmosphere. The cover head  400  may also be disposed independently in each of the head chips  2 . 
     Embodiments of the invention have been described above, but the basic configuration of the invention is not limited to the above description. 
     For example, two head chips  2  may be disposed in the recording head  1  according to the embodiments described above, but the number of the head chips  2  is not particularly limited thereto. The recording head  1  may include only one head chip or the recording head  1  may include three or more head chips  2 . In addition, an example in which the first head chip  2 A and the second head chip  2 B are configured to be disposed in the recording head  1  has been described above, but embodiments of the invention are not limited thereto and only one of the first head chip  2 A and the second head chip  2 B may be disposed in the recording head  1 . The configuration of the head chip  2  is not limited to the first head chip  2 A and the second head chip  2 B described above. 
     In addition, the first connection flow path  600 A and the second connection flow path  600 B that are connected to one of the head chips  2  are connected to the upstream flow path  500 , which is a common flow path that may be common. However, the embodiments of the invention are not particularly limited thereto, and the first connection flow path  600 A and the second connection flow path  600 B may communicate with respective flow paths independent from each other. In a case where the first inlet  44 A and the second inlet  44 B are configured to communicate with the common flow path as described above, it is difficult for the wiring member  121  that is disposed between the first inlet  44 A and the second inlet  44 B to extend outside the flow path beyond the common flow path. However, since the wiring member  121  is connected with the wiring substrate  300  between the first connection flow path  600 A and the second connection flow path  600 B, the wiring member  121  does not have to extend beyond the common flow path. 
     Furthermore, although the two wiring members  121  and the four first connection flow paths  600 A are inserted into the first insertion hole  301  in the first embodiment described above, embodiments are not particularly limited thereto and the insertion hole into which the wiring member  121  is inserted and the insertion hole into which the first connection flow path  600 A is inserted may be disposed independently of each other. In addition, the rows of the first connection flow paths  600 A juxtaposed in the first direction X may be inserted into one insertion hole, and the insertion hole may be disposed independently for each of the first connection flow paths  600 A. However, assemblability can be improved when the two wiring members  121  and the four first connection flow paths  600 A are inserted into the first insertion hole  301  as described above. 
     Furthermore, the flow path member  200  that includes the upstream flow path member  210  where the upstream flow path  500  is disposed and the downstream flow path member  220  where the downstream flow path  600  is disposed has been described as an example in the embodiments described above, but the upstream and the downstream directions may be reversed in a case where ink (liquid) is circulated. In other words, ink that is supplied to the head chips  2  may be allowed to flow from the downstream flow path  600  to the upstream flow path  500  and may be discharged (circulated) to the liquid holding portion, a storage portion where discharge ink is stored, and the like. 
     In addition, the thin film type piezoelectric actuator  130  has been used in the description of the first embodiment above as the pressure generating unit that causes pressure change in the pressure generating chamber  12 , but embodiments are not limited thereto. For example, a thick film type piezoelectric actuator that is formed by using a method such as green sheet pasting, a vertical vibration type piezoelectric actuator in which a piezoelectric material and an electrode forming material are stacked alternately to be expanded and contracted in an axial direction, and the like can also be used. In addition, liquid droplets may be discharged from a nozzle opening by using bubbles that are generated through heating by heater elements which are arranged in a pressure generating chamber as a pressure generating unit, a so-called electrostatic actuator that discharges liquid droplets from a nozzle opening by deforming a vibrating plate with the electrostatic force of static electricity that is generated between the vibrating plate and an electrode, and the like can also be used as pressure generating units. 
     In addition, the ink jet type recording head  1  may constitute a part of an ink jet type recording head unit that includes an ink flow path which communicates with an ink cartridge and the like, and is mounted on an ink jet type recording apparatus.  FIG. 8  is a schematic view illustrating an example of the ink jet type recording apparatus. 
     In an ink jet type recording head unit II (hereinafter, referred to the head unit II), which has a plurality of the ink jet type recording heads  1 , of an ink jet type recording apparatus I illustrated in  FIG. 8 , a cartridge  1 A that constitutes the liquid holding portion is removably disposed and a carriage  3 , on which the head unit II is mounted, is disposed on a carriage shaft  5 , which is mounted on an apparatus main body  4 , to be movable in the axial direction. The recording head unit II may discharge, for example, a black ink composition and a color ink composition. 
     When the driving force of a drive motor  6  is transmitted to the carriage  3  via a plurality of gears (not illustrated) and a timing belt  7 , the carriage  3  that is mounted on the head unit II is moved along the carriage shaft  5 . A platen  8  is disposed along the carriage shaft  5  in the apparatus main body  4 . A recording sheet S, which is a recording medium such as paper fed by a feed roller (not illustrated), is wound around the platen  8  and transported. 
     In addition, the ink jet type recording apparatus I in which the ink jet type recording head  1  (head unit II) is mounted on the carriage  3  and is moved in a main scanning direction has been described above, but the invention is not limited thereto. For example, the invention can also be applied to a so-called line type recording apparatus that performs printing by moving the recording sheet S such as paper only in a sub-scanning direction with the ink jet type recording head  1  fixed thereto. 
     In addition, the ink cartridge  1 A, which is a liquid holding portion, is configured to be mounted on the carriage  3  in the ink jet type recording apparatus I according to the example described above, but the invention is not limited thereto. For example, the liquid holding portion such as an ink tank may be fixed to the apparatus main body  4  and the liquid holding portion and the ink jet type recording head  1  may be connected via a supply tube such as a tube. In addition, the liquid holding portion may not be mounted on the ink jet type recording apparatus. 
     Furthermore, embodiments of the invention target a wide range of liquid ejecting heads in general. For example, embodiments can also be applied to recording heads such as various types of ink jet type recording heads used in image recording apparatuses such as printers, color material ejecting heads used in manufacturing color filters such as liquid crystal displays, electrode material ejecting heads used in forming electrodes such as organic EL displays and field emission displays (FED), bio-organic material ejecting heads used in manufacturing biochips, and the like.