Patent Publication Number: US-9427965-B2

Title: Liquid ejecting head and liquid ejecting apparatus

Description:
CROSS REFERENCES TO RELATED APPLICATIONS 
     This application claims priority to Japanese Patent Application No. 2014-053653 filed on Mar. 17, 2014. The entire disclosure of Japanese Patent Application No. 2014-053653 is hereby incorporated herein by reference. 
     BACKGROUND 
     1. Technical Field 
     The present invention relates to a liquid ejecting head and a liquid ejecting apparatus and, particularly, relates to an ink jet type recording head which ejects ink as liquid and an ink jet type recording apparatus. 
     2. Related Art 
     An ink jet type recording head which includes a head main body in which a pressure generation chamber communicating with a nozzle opening through which ink droplets are discharged is deformed by a pressure generation unit, such as a piezoelectric element, in such a manner that an ink droplet is discharged through the nozzle opening and a flow-path member which constitutes a flow path of ink supplied to the head main body is known as a liquid ejecting head. 
     The head main body is connected to the flow-path member. Ink is supplied from the flow path to the head main body or ink is discharged from the head main body to the flow path. An ink jet type recording head in which a plurality of nozzle opening groups, each of which is constituted of a plurality of nozzle openings and ejects the same ink, are provided in one head main body and a flow-path member having a plurality of flow paths through which different inks are supplied to respective nozzle opening groups are provided has been proposed (see JP-A-2005-193680, for example). 
     In the ink jet type recording head according to JP-A-2005-193680, a manifold in common to the nozzle openings constituting the nozzle opening group is formed. A plurality of manifolds are provided corresponding to the number of the nozzle opening groups. The plurality of manifolds are arranged in a state where the manifolds overlap in a direction perpendicular to a liquid ejection surface in which the nozzle openings are provided. Accordingly, the plane-direction size of the liquid ejection surface can be reduced, compared to in the case where all of the manifolds are arranged in the same plane. 
     However, when the plurality of manifolds overlap each other in the direction perpendicular to the liquid ejection surface, the plurality of manifolds are located at different positions in the direction perpendicular to the liquid ejection surface. As a result, the position of each manifold in relation to the liquid ejection surface is different for each nozzle opening group. Furthermore, the length of a flow path from the manifold to the nozzle opening group is different for each nozzle opening group, and thus flow-path resistance is different. Furthermore, the weight of ink droplets ejected from the nozzle opening group is different for each nozzle opening group. 
     When the plurality of manifolds are located at different positions in the direction perpendicular to the liquid ejection surface, as described above, variation in ejection properties of the ink ejected from each manifold occurs. 
     Such a problem is not limited to an ink jet type recording head which discharges ink but is shared by a liquid ejecting head and a liquid ejecting apparatus which eject liquid other than ink. 
     SUMMARY 
     An advantage of some aspects of the invention is to provide a liquid ejecting head of which the size is reduced and in which variation in ejection properties of liquid ejected from a plurality of manifolds can be reduced, and a liquid ejecting apparatus. 
     Aspect 1 
     According to an aspect of the invention for solving the problem described above, there is provided a liquid ejecting head which includes a head main body which ejects liquid from a liquid ejection surface and has a plurality of manifolds which store the liquid, and a flow-path member in which a first distribution flow path and a second distribution flow path are provided to supply liquid to the head main body, in which the plurality of manifolds are arranged on the same plane and the plurality of manifolds, the first distribution flow path, and the second distribution flow path are not disposed in the same plane. 
     In the aspect, the size of the flow-path member can be reduced in an in-plane direction parallel to the liquid ejection surface, compared to in the case where the first distribution flow path and the second distribution flow path are formed in the same plane. Furthermore, in one head main body, the plurality of manifolds are arranged in the same plane. Thus, the positions of respective manifolds can be aligned in the direction perpendicular to the liquid ejection surface. Accordingly, in different manifolds, the lengths of the flow paths from respective manifolds to the nozzle openings are set to be values which are as similar as possible. As a result, variation in flow-path resistance can be reduced. In other words, variation in the pressure of liquid in the manifold can be reduced, and thus it is easy to manage back-pressure control. In the case of the manifold of the related art, the size thereof can be reduced. However, liquid ejection properties are deteriorated. However, according to the liquid ejecting head of the invention, the first distribution flow path and the second distribution flow path are not formed in the same plane in the flow-path member, in such a manner that the size thereof can be reduced. In addition, the manifolds are provided in the same plane in the head main body, in such a manner that the liquid ejection properties can be improved. The liquid ejecting head according to the invention can achieve a reduction in the size and improvement in the liquid ejection properties, as described above. In addition, the plurality of manifolds, the first distribution flow path, and the second distribution flow path are not disposed in the same plane. Accordingly, in both the first distribution flow path and the second distribution flow path, flow paths allowing air bubbles to be effectively discharged can be provided in portions between the distribution flow paths and the manifolds in the direction perpendicular to the liquid ejection surface. 
     Aspect 2 
     In the liquid ejecting head according to Aspect 1, it is preferable that at least parts of the first distribution flow path and the second distribution flow path overlap when viewed from a direction perpendicular to the liquid ejection surface. In the aspect, the first distribution flow path and the second distribution flow path overlap in the direction perpendicular to the liquid ejection surface, and thus the size of the first distribution flow path and the second distribution flow path can be reduced in the in-plane direction of the liquid ejection surface, compared to in the case where the distribution flow paths do not overlap. As a result, the size of the liquid ejecting head can be reduced in the in-plane direction of the liquid ejecting surface. 
     Aspect 3 
     In the liquid ejecting head according to Aspect 1 or 2, it is preferable that the liquid ejecting head further include a first introduction flow path which communicates with the first distribution flow path, and a second introduction flow path which communicates with the second distribution flow path. Furthermore, it is preferable that the first introduction flow path and the second introduction flow path extend to a side opposite to the head main body, in a direction perpendicular to the liquid ejection surface. In addition, it is preferable that a boundary portion between the first distribution flow path and the first introduction flow path and a boundary portion between the second distribution flow path and the second introduction flow path be disposed on an inner portion between the plurality of manifolds, in the a direction in which ink flows in the first distribution flow path and the second distribution flow path. In the aspect, it is not necessary to arrange the boundary portions outside the manifolds. As a result, the size of the liquid ejecting head can be reduced. 
     Aspect 4 
     In the liquid ejecting head according to Aspect 3, it is preferable that, in a direction perpendicular to the liquid ejection surface, the first distribution flow path be disposed closer to the head main body than the second introduction flow path. In addition, it is preferable that the second distribution flow path be formed in a state where the second distribution flow path makes a detour in order to avoid the first introduction flow path. In the aspect, the second distribution flow path is formed in a state where the second distribution flow path makes a detour in order to avoid the first introduction flow path. As a result, the degree of freedom in the arrangement of the first introduction flow path is increased. 
     Aspect 5 
     In the liquid ejecting head according to any one of Aspects 1 to 4, it is preferable that the flow-path member be formed by stacking a first flow-path member, a second flow-path member, and a third flow-path member, in the direction perpendicular to the liquid ejection surface, in order, far away from the head main body. Furthermore, it is preferable that the first distribution flow path be formed in a boundary between the second flow-path member and the third flow-path member. In addition, it is preferable that the second distribution flow path be formed in a boundary between the first flow-path member and the second flow-path member. In the aspect, the first distribution flow path and the second distribution flow path can be formed by at least three members. As a result, the number of parts can be reduced. 
     Aspect 6 
     In the liquid ejecting head according to any one of Aspects 1 to 5, it is preferable that the direction in which liquid flows in the manifold intersect a direction in which liquid flows in the first distribution flow path and the second distribution flow path. In this aspect, liquid can be effectively supplied over the entirety of the flow-path member when the flow-path member is viewed from the top, compared to in the case where the direction in which liquid flows in the manifold is parallel to the direction in which liquid flows in the first distribution flow path and the second distribution flow path. Furthermore, the size of the distribution flow path can be reduced. 
     Aspect 7 
     In the liquid ejecting head according to any one of Aspects 1 to 6, it is preferable that a nozzle row constituted of a plurality of nozzle openings which are aligned in one direction and through which liquid is ejected be provided in the liquid ejection surface. In addition, it is preferable that the manifold extend in the one direction. Furthermore, it is preferable that a vertical flow path extending in a direction perpendicular to the liquid ejection surface allow the manifold to communicate with the first distribution flow path and the second distribution flow path. In the aspect, the size of the flow-path member can be reduced when the flow-path member is viewed from the top. In addition, it is possible to easily adjust a gap between the first distribution flow path and the manifold and a gap between the second distribution flow path and the manifold, in the direction perpendicular to the liquid ejection surface. 
     Aspect 8 
     In the liquid ejecting head according to any one of Aspects 1 to 7, it is preferable that the liquid ejecting head further include a plurality of head main bodies. In addition, it is preferable that the flow-path member include first connection portions and second connection portions which are connected to respective head main bodies, first bifurcation flow paths which allow the first distribution flow paths to be connected to respective first connection portions, and second bifurcation flow paths which allow the second distribution flow paths to be connected to respective second connection portions. In the aspect, it is possible to provide flow paths which communicate with the plurality of connection portions through the first bifurcation flow path and the second bifurcation flow path which branch off from the first distribution flow path and the second distribution flow path. As a result, flow paths through which liquid is supplied to the plurality of head main bodies can be reliably formed in a small space. Furthermore, since the bifurcation flow paths are provided, the positional relationship of the connection portions in a plane, in relation to the distribution flow paths, can be set with a high degree of freedom. As a result, the degree of freedom in the layout is increased. 
     Aspect 9 
     In the liquid ejecting head according to Aspect 8, it is preferable that the first distribution flow path and the first bifurcation flow path be formed in the same plane. Furthermore, it is preferable that the second distribution flow path and the second bifurcation flow path be formed in the same plane. In the aspect, the first distribution flow path, the second distribution flow path, and the bifurcation flow path can be formed in a common member. 
     Aspect 10 
     In the liquid ejecting head according to Aspect 8 or 9, it is preferable that the first connection portion and the second connection portion be connected to a common head main body. In the aspect, different liquids can be supplied to one head main body through the plurality of flow paths. 
     Aspect 11 
     In the liquid ejecting head according to any one of Aspects 8 to 10, it is preferable that the liquid ejecting head further include flexible wiring substrates which are respectively connected to the head main bodies. In addition, it is preferable that the flexible wiring substrates extend to the flow-path member side with respect to the head main bodies. Furthermore, it is preferable that the first connection portions and the second connection portions be connected to the head main bodies with the flexible wiring substrates interposed therebetween. In the aspect, it is easy to connect the flexible wiring substrate and a terminal (such as a lead electrode of a pressure generation unit) in the head main body to which the flexible wiring substrate is connected. 
     Aspect 12 
     In the liquid ejecting head according to any one of Aspects 8 to 11, it is preferable that the first connection portions and the second connection portions be alternately connected to the head main bodies aligned in a direction in which the first distribution flow path and the second distribution flow path extend. In the aspect, a plurality of different liquids can be supplied to the respective head main bodies. 
     Aspect 13 
     In the liquid ejecting head according to any one of Aspects 8 to 12, it is preferable that the liquid ejecting head further include a relay substrate to which the flexible wiring substrate is connected. In addition, it is preferable that the flow-path member be provided in a portion between the relay substrate and the head main bodies, in a direction in which the flexible wiring substrate extends to the flow-path member side with respect to the head main body. In the aspect, the distribution flow path can be formed in a portion outside the area in which the flexible wiring substrate is disposed. As a result, the size of the flow-path member can be reduced. 
     Aspect 14 
     In the liquid ejecting head according to any one of Aspects 8 to 13, it is preferable that the head main body have the manifold which extends in one direction along an end portion of the flexible wiring substrate, which is the end portion bonded to the head main body, and which stores liquid supplied to the head main body. Furthermore, it is preferable that the first connection portions and the second connection portions be disposed in a portion between one of both ends of the manifold, which is the end far away, in the one direction, from the distribution flow path, and the distribution flow path. In the aspect, liquid can be supplied, in one direction, by the manifold. Thus, it is not necessary to dispose the connection portion on a side far away from the distribution flow path. As a result, the layout is facilitated. 
     Aspect 15 
     In the liquid ejecting head according to any one of Aspects 8 to 14, it is preferable that the first distribution flow path be located closer to the head main body side in a direction perpendicular to the liquid ejection surface than the second distribution flow path. Furthermore, it is preferable that the flexible wiring substrate be constituted of one end portion which is located, in a direction perpendicular to the liquid ejection surface, close to the head main body and the other end portion which is located far away from the head main body. In addition, it is preferable that the plane-direction width of the other end portion be smaller than that of the one end portion. Furthermore, it is preferable that the second distribution flow path be formed in the flow-path member, in a state where the second distribution flow path passes through an area outside the other end portion in the plane direction. In the aspect, an area in which the second distribution flow path is formed can be provided outside the flexible wiring substrate, in the plane direction (which is a direction parallel to the surface) of the flexible wiring substrate. As a result, the degree of freedom in the arrangement of the second flow path is further increased in the flow-path member. 
     Aspect 16 
     In the liquid ejecting head according to any one of Aspects 8 to 15, it is preferable that all of the flexible wiring substrates connected to the head main bodies, each of which communicates with one of the first distribution flow paths and the second distribution flow paths overlap when viewed from a direction in which liquid flows in the first distribution flow path or the second distribution flow path. In the aspect, the first distribution flow path or the second distribution flow path can extend in a straight line shape, in a direction in which liquid flows. As a result, it is possible to ensure the minimum width of the first distribution flow path or the second distribution flow path in a direction intersecting the direction in which liquid flows. 
     Aspect 17 
     In the liquid ejecting head according to any one of Aspects 8 to 16, it is preferable that the first distribution flow path be located further on the head main body side in a direction perpendicular to the liquid ejection surface than the second distribution flow path. In addition, it is preferable that nozzle rows constituted of nozzle openings which are aligned in one direction and through which liquid is ejected be provided in the liquid ejection surface of the head main body. In addition, it is preferable that the one direction in which the nozzle rows are aligned intersect a transporting direction of an ejection target medium onto which liquid is ejected by the head main body. In addition, it is preferable that the first distribution flow path include a first upstream-side distribution flow path and a first downstream-side distribution flow path which are disposed on both sides of the head main body in the transporting direction. It is preferable that the second distribution flow path include a second upstream-side distribution flow path and a second downstream-side distribution flow path which are disposed on both sides of the head main body in the transporting direction. Furthermore, it is preferable that the positions of the first upstream distribution flow path, the first downstream-side distribution flow path, the second upstream-side distribution flow path, and the second downstream-side distribution flow path, in relation to the flexible wiring substrates, be common to all of the head main bodies. In the aspect, the head main bodies are aligned, in such a manner that, even when a specific nozzle row of the head main body is not extended, a line constituted of nozzle openings aligned in the alignment direction can be formed. 
     Aspect 18 
     According to another aspect of the invention, there is provided a liquid ejecting apparatus which includes the liquid ejecting head according to any one of Aspects 1 to 17. 
     In the aspect, it is possible to provide a liquid ejecting apparatus having a liquid ejecting head of which the size is reduced and in which variation in the ejection properties of liquid ejected from the plurality of manifolds can be reduced. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements. 
         FIG. 1  is a schematic perspective view of a recording apparatus according to Embodiment 1 of the invention. 
         FIG. 2  is an exploded perspective view of a head unit according to Embodiment 1 of the invention. 
         FIG. 3  is a bottom view of the head unit according to Embodiment 1 of the invention. 
         FIG. 4  is a plan view of a recording head according to Embodiment 1 of the invention. 
         FIG. 5  is a bottom view of the recording head according to Embodiment 1 of the invention. 
         FIG. 6  is a cross-sectional view of  FIG. 4 , taken along line VI-VI. 
         FIG. 7  is an exploded perspective view of a head main body according to Embodiment 1 of the invention. 
         FIG. 8  is a cross-sectional view of the head main body according to Embodiment 1 of the invention. 
         FIG. 9  is a schematic view illustrating the arrangement of nozzle openings of Embodiment 1 of the invention. 
         FIG. 10  is a plan view of a flow-path member (which is a first flow-path member) according to Embodiment 1 of the invention. 
         FIG. 11  is a plan view of a second flow-path member according to Embodiment 1 of the invention. 
         FIG. 12  is a plan view of a third flow-path member according to Embodiment 1 of the invention. 
         FIG. 13  is a bottom view of the third flow-path member according to Embodiment 1 of the invention. 
         FIG. 14  is a cross-sectional view of  FIGS. 10 to 13 , taken along a line XIV-XIV. 
         FIG. 15  is a cross-sectional view of  FIGS. 10 to 13 , taken along a line XV-XV. 
         FIG. 16  is a cross-sectional view of  FIGS. 10 to 15 , taken along a line XVI-XVI. 
         FIG. 17A  is a cross-sectional view of  FIGS. 10 to 13 , taken along a line XVIIA-XVIIA, and  FIG. 17B  is a schematic cross-sectional view of a comparative example. 
         FIG. 18  is a schematic plan view of the head main body according to Embodiment 1 of the invention. 
         FIG. 19  is a side view of the recording head, in which the positional relationship between distribution flow paths is schematically illustrated. 
         FIG. 20  is a schematic plan view of a recording head according to Embodiment 2. 
         FIG. 21  is a schematic plan view of a recording head according to Embodiment 3. 
         FIG. 22  is a schematic plan view of a recording head according to Embodiment 4. 
         FIG. 23  is a schematic plan view of a recording head according to Embodiment 5. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Embodiment 1 
     Details of embodiments of the invention will be described. An ink jet type recording head is an example of a liquid ejecting head and is also referred to simply as a recording head. An ink jet type recording unit is an example of a liquid ejecting head unit and is also referred to simply as a head unit. An ink jet type recording apparatus is an example of a liquid ejecting apparatus.  FIG. 1  is a perspective view illustrating the schematic configuration of an ink jet type recording apparatus according to this embodiment. 
     An ink jet type recording apparatus  1  is a so-called line type recording apparatus, as illustrated in  FIG. 1 . The ink jet type recording apparatus  1  includes a head unit  101 . In the ink jet type recording apparatus  1 , a recording sheet S, such as a paper sheet as an ejection target medium, is transported, in such a manner that printing is performed. 
     Specifically, the ink jet type recording apparatus  1  includes an apparatus main body  2 , the head unit  101 , a transport unit  4 , and a support member  7 . The head unit  101  has a plurality of recording heads  100 . The transport unit  4  transports the recording sheet S. The support member  7  supports the recording sheet S facing the head unit  101 . In this embodiment, a transporting direction of the recording sheet S is set to an X direction. In a liquid ejection surface of the head unit  101 , in which nozzle openings are provided, a direction perpendicular to the X direction is set to a Y direction. A direction perpendicular to both the X direction and the Y direction is set to a Z direction. In the X direction, an upstream direction in which the recording sheet S is transported is set to an X 1  direction and a downstream direction is set to an X 2  direction. In the Y direction, one direction is set to a Y 1  direction and the other is set to a Y 2  direction. In the Z direction, a direction (toward the recording sheet S) parallel to a liquid ejecting direction is set to a Z 1  direction and an opposite direction is set to a Z 2  direction. 
     The head unit  101  includes a plurality of recording heads  100  and a head fixing substrate  102  which holds a plurality of recording heads  100 . 
     The plurality of recording heads  100  is fixed to the head fixing substrate  102 , in a state where the recording heads  100  are aligned in the Y direction intersecting the X direction which is the transporting direction. In this embodiment, the plurality of recording heads  100  are aligned in a straight line extending in the Y direction. In other words, the plurality of recording heads  100  are arranged so as not to be shifted toward the X direction. Accordingly, the X-direction width of head unit  101  is reduced, and thus it is possible to reduce the size of the head unit  101 . 
     The head fixing substrate  102  holds the plurality of recording heads  100 , in a state where the nozzle openings of the plurality of recording heads  100  are directed to the recording sheet S. The head fixing substrate  102  holds a plurality of the recording heads  100  and is fixed to the apparatus main body  2 . 
     The transport unit  4  transports the recording sheet S in the X direction, with respect to the head unit  101 . The transport unit  4  includes a first transport roller  5  and a second transport roller  6  which are provided, in relation with the head unit  101 , for example, on both sides in the X direction as the transporting direction of the recording sheet S. The recording sheet S is transported, in the X direction, by the first transport roller  5  and the second transport roller  6 . The transport unit  4  for transporting the recording sheet S is not limited to a transport roller. The transport unit  4  may be constituted of a belt, a drum, or the like. 
     The support member  7  supports the recording sheet S transported by the transport unit  4 , at a position facing the head unit  101 . The support member  7  is constituted of, for example, a metal member or a resin member of which the cross-sectional surface has a rectangular shape. The support member  7  is disposed in an area between the first transport roller  5  and the second transport roller  6 , in a state where the support member  7  faces the head unit  101 . 
     An adhesion unit which is provided in the support member  7  and causes the recording sheet S to adhere thereto may be provided in the support member  7 . Examples of the adhesion unit include a unit which causes the recording sheet S to adhere thereto by sucking up the recording sheet S and a unit which causes the recording sheet S to be adhered thereto by electrostatically attracting the recording sheet S using electrostatic force. Furthermore, when the transport unit  4  is constituted of a belt or a drum, the support member  7  is located at a position facing the head unit  101  and causes the recording sheet S to be supported on the belt or the drum. 
     Although not illustrated, a liquid storage unit, such as an ink tank and an ink cartridge in which ink is stored, is connected to each recording head  100  of the head unit  101 , in a state where the liquid storage unit can supply ink to the recording head  100 . The liquid storage unit may be held on, for example, the head unit  101 . Alternatively, in the apparatus main body  2 , the liquid storage unit is held at a position separate from the head unit  101 . A flow path and the like through which the ink supplied from the liquid storage unit is supplied to the recording head  100  may be provided in the inner portion of the head fixing substrate  102 . Alternatively, an ink flow-path may be provided in the head fixing substrate  102  and ink from the liquid storage unit may be supplied to the recording head  100  through the ink flow-path member. Needless to say, ink may be directly supplied from the liquid storage unit to the recording head  100 , without passing through the head fixing substrate  102  or the ink flow-path member fixed to the head fixing substrate  102 . 
     In such an ink jet type recording apparatus  1 , the recording sheet S is transported, in the X direction, by the first transport roller  5 , and then the head unit  101  performs printing on the recording sheet S supported on the support member  7 . The recording sheet S subjected to printing is transported, in the X direction, by the second transport roller  6 . 
     Details of the head unit  101  will be described with reference to  FIGS. 2 and 3 .  FIG. 2  is an exploded perspective view illustrating the head unit according to this embodiment and  FIG. 3  is a bottom view of the head unit, when viewed from the liquid ejection surface side. 
     The head unit  101  of this embodiment includes a plurality of recording heads  100  and the head fixing substrate  102  which holds the plurality of recording heads  100 . In the recording head  100 , a liquid ejection surface  20   a  in which the nozzle openings  21  are formed is provided on the Z 1  side in the Z direction. Each recording head  100  is fixed to a surface of the head fixing substrate  102 , which is the surface facing the recording sheet S. In other words, the recording head  100  is fixed to the Z 1  side, that is, the side facing the recording sheet S, of the head fixing substrate  102  in the Z direction. 
     As described above, the plurality of recording heads  100  are fixed to the head fixing substrate  102 , in a state where the recording heads  100  are aligned in a straight line extending in the Y direction perpendicular to the X direction which is the transporting direction. In other words, the plurality of recording heads  100  are arranged so as not to be shifted toward the X direction. Accordingly, the X-direction width of the head unit  101  is reduced, and thus it is possible to reduce the size of the head unit  101 . Needless to say, the recording heads  100  aligned in the Y direction may be arranged so as to be shifted toward the X direction. However, in this case, when the recording heads  100  are greatly shifted toward the X direction, for example, the X-direction width of the head fixing substrate  102  increases. When the X-direction size of the head unit  101  increases, as described above, the X-directional distance between the first transport roller  5  and the second transport roller  6  increases in the ink jet type recording apparatus  1 . As a result, it is difficult to fix the posture of the recording sheet S. In addition, the size of the head unit  101  and the ink jet type recording apparatus  1  increases. 
     In this embodiment, four recording heads  100  are fixed to the head fixing substrate  102 . However, the configuration is not limited thereto, as long as the number of recording heads  100  is two or more. 
     Next, the recording head  100  will be described with reference to  FIG. 2  and  FIGS. 4 to 6 .  FIG. 4  is a plan view of the recording head and  FIG. 5  is a bottom view of the recording head.  FIG. 6  is a cross-sectional view of  FIG. 4 , taken along a line VI-VI.  FIG. 4  is a plan view of the recording head  100 , when viewed from the Z 2  side in the Z direction. A holding member  120  is not illustrated in  FIG. 4 . 
     The recording head  100  includes the plurality of head main bodies  110 , COF substrates  98 , and a flow-path member  200 . The COF substrates  98  are respectively connected to the head main bodies  110 . Flow paths through which ink is supplied to respective head main bodies  110  are provided in the flow-path member  200 . Furthermore, in this embodiment, the recording head  100  includes the holding member  120 , a fixing plate  130 , and a relay substrate  140 . The holding member  120  holds the plurality of head main bodies  110 . The fixing plate  130  is provided on the liquid ejection surface  20   a  side of the head main body  110 . 
     The head main body  110  receives ink from the holding member  120  and the flow-path member  200  in which ink flow paths are provided. Control signals are transmitted from a controller (not illustrated) in the ink jet type recording apparatus  1  to the head main body  110 , via both the relay substrate  140  and the COF substrate  98 , and the head main body  110  discharges ink droplets in accordance with the control signals. Details of the configuration of the head main body  110  will be described below. 
     In each head main body  110 , the liquid ejection surface  20   a  in which nozzle openings  21  are formed is provided on the Z 1  side in the Z direction. Z 2  sides of the plurality of head main bodies  110  adhere to the Z 1 -side surface of the flow-path member  200 . 
     Flow paths of ink supplied to the head main body  110  are provided in the flow-path member  200 . The plurality of head main bodies  110  adhere to the Z 1 -side surface of the flow-path member  200 , in a state where the plurality of head main bodies  110  are aligned in the Y direction. Details of the configuration of the flow-path member  200  will be described below. The flow paths in the flow-path member  200  are connected to flow paths communicating with the nozzle openings  21  of the respective head main bodies  110 , in such a manner that ink is supplied from the flow-path member  200  to the respective head main bodies  110 . 
     In this embodiment, six head main bodies  110  adhere to one flow-path member  200 . However, the number of head main bodies  110  fixed to one flow-path member  200  is not limited to six. One head main body  110  may be fixed to each flow-path member  200  or two or more head main bodies  110  may be fixed to each flow-path member  200 . 
     An opening portion  201  is provided in the flow-path member  200 , in a state where the opening portion  201  passes through the flow-path member  200  in the Z direction. The COF substrate  98  of which one end is connected to the head main body  110  is inserted through the opening portion  201 . 
     The COF substrate  98  is an example of a flexible wiring substrate. A flexible wiring substrate is a flexible substrate having wiring formed thereon. Furthermore, the COF substrate  98  includes a driving circuit  97  (see  FIG. 7 ) which drives a pressure generation unit in the head main body  110 . 
     The relay substrate  140  is a substrate on which electrical components, such as wiring, an IC, and a resistor, are mounted. The relay substrate  140  is disposed in a portion between the holding member  120  and the flow-path member  200 . A passing-through portion  141  communicating with the opening portion  201  in the flow-path member  200  is formed in the relay substrate  140 . The size of the opening of each passing-through portion  141  is greater than that of the opening portion  201  of the flow-path member  200 . 
     The COF substrate  98  connected to the pressure generation unit of the head main body  110  is inserted through both the opening portion  201  and the passing-through portion  141 . The COF substrate  98  is connected to a terminal (not illustrated) in the Z 2 -side surface of the relay substrate  140 . 
     Although not particularly illustrated, the relay substrate  140  is connected to the controller of the ink jet type recording apparatus  1 . Accordingly, for example, the driving signals sent from the controller are transmitted, through the relay substrate  140 , to the driving circuit  97  of the COF substrate  98 . The pressure generation unit of the head main body  110  is driven by the driving circuit  97 . Therefore, an ink ejection operation of the recording head  100  is controlled. 
     On the Z 1  side of the holding member  120 , a hold portion  121  is provided to form a space having a groove shape. On the Z 1 -side surface of the holding member  120 , the hold portion  121  continuously extends in the Y direction, and thus the hold portion  121  is open to both side surfaces of the holding member  120  in the Y direction. Furthermore, the hold portion  121  is provided in a substantially central portion of the holding member  120  in the X direction, and thus leg portions  122  are formed on both sides of the hold portion  121  in the X direction. In other words, in the Z 1 -side surface of the holding member  120 , the leg portions  122  are provided on only both end portions in the X direction and are not provided on both end portions in the Y direction. In this embodiment, the holding member  120  is constituted of one member. However, the configuration of the holding member  120  is not limited thereto. The holding member  120  may be constituted of a plurality of members stacked in the Z direction. 
     The relay substrate  140 , the flow-path member  200 , and the plurality of head main body  110  are accommodated in such a hold portion  121 . Specifically, the respective head main bodies  110  are bonded to the Z 1 -side surface of the flow-path member  200 , using, for example, an adhesive. Furthermore, the relay substrate  140  is fixed to the Z 2 -side surface of the flow-path member  200 . The relay substrate  140 , the flow-path member  200 , and the plurality of head main bodies  110  which are bonded into a single member are accommodated in the hold portion  121 . 
     In the holding member  120  and the flow-path member  200 , the Z-direction facing surfaces of the hold portion  121  and the flow-path member  200  adhere to each other, using an adhesive. The relay substrate  140  is accommodated in a space between the hold portion  121  and the flow-path member  200 . The holding member  120  and the flow-path member  200  may be integrally fixed using a fixing unit, such as a screw, instead of using an adhesive. 
     Although not particularly illustrated, a flow path through which ink flows, a filter which filters out, for example, foreign matter, and the like may be provided in the holding member  120 . The flow path of the holding member  120  communicates with the flow path of the flow-path member  200 . Accordingly, the ink fed from the liquid storage unit in the ink jet type recording apparatus  1  is supplied to the head main body  110  via both the holding member  120  and the flow-path member  200 . 
     The fixing plate  130  is provided on the liquid ejection surface  20   a  side of the recording head  100 . In other words, the fixing plate  130  is provided on the Z 1  side of the recording head  100  in the Z direction and holds the respective recording heads  100 . The fixing plate  130  is formed by bending a plate-shaped member constituted of, for example, metal. Specifically, the fixing plate  130  includes a base portion  131  and bent portions  132 . The base portion  131  is provided on the liquid ejection surface  20   a  side of the fixing plate  130 . Both end portions of the base portion  131  in the Y direction are bent in the Z 2  direction, in such a manner that the bent portions  132  are formed. 
     Exposure opening portions  133  are provided in the base portion  131 . The exposure opening portions  133  are openings for exposing the nozzle openings  21  of the respective head main bodies  110 . In this embodiment, the exposure opening portions  133  are open in a state where the exposure opening portions  133  separately respectively correspond to the head main bodies  110 . In other words, the recording head  100  of this embodiment has the six head main bodies  110 , and thus six separate exposure opening portions  133  are provided in the base portion  131 . Needless to say, one common exposure opening portion  133  may be provided with respect to a head main body group constituted of a plurality of head main bodies  110 , in accordance with, for example, the configuration of the head main body  110 . 
     The Z 1  side of the hold portion  121  of the holding member  120  is covered with such a base portion  131 . The base portion  131  is bonded, using an adhesive, to the Z 1 -side surface of the holding member  120  in the Z direction, in other words, the Z 1 -side end surfaces of the leg portion  122 , as illustrated in  FIG. 6 . 
     The bent portions  132  are provided on both end portions of the base portion  131  in the Y direction. The bent portions  132  have a size which is capable of covering the opening areas of the hold portion  121 , which are open in the Y-direction side surfaces of the hold portion  121 . In other words, the bent portion  132  is a portion extending from the Y-direction end portion of the base portion  131  to the edge portion of the fixing plate  130 . In addition, such a bent portion  132  is bonded, using an adhesive, to the Y-direction side surface of the holding member  120 . Accordingly, the openings of the hold portion  121 , which are open in the Y-direction side surfaces of the hold portion  121 , are covered and sealed with the bent portions  132 . 
     The fixing plate  130  adheres, using an adhesive, to the holding member  120 , as described above, and thus the head main body  110  is disposed in the inner portion of the hold portion  121 , which is a space between the holding member  120  and the fixing plate  130 . 
     The plurality of head main bodies  110  are provided in each recording head  100 , in such a manner that the recording head  100  of this embodiment has a plurality of nozzle rows, as described above. In this case, it is possible to improve the yield, compared to in a case where a plurality of nozzle rows are provided in only one head main body  110 , in such a manner that one recording head  100  has a plurality of nozzle rows. In other words, when a plurality of nozzle rows are provided by one head main body  110 , the yield of the head main body  110  decreases and the manufacturing cost increases. In contrast, when a plurality of nozzle rows are provided in a plurality of head main bodies  110 , the yield of the head main body  110  is improved and the manufacturing cost can be reduced. 
     The openings in the Y-direction side surfaces of the holding member  120  are sealed with the bent portions  132  of the fixing plate  130 . Accordingly, even when leg portions which adhere to the base portion  131  of the fixing plate  130  are not provided on both sides (which are hatched portions in  FIG. 3 ) of the holding member  120  in the Y direction, it is possible to prevent moisture evaporation from occurring through the openings in the Y-direction side surfaces of the hold portion  121 . 
     Accordingly, in the head unit  101  in which the recording heads  100  are aligned in the Y direction, a gap between adjacent recording heads  100  in the Y direction can be reduced because the leg portions  122  are not provided on the Y-direction sides of the adjacent recording heads  100 . Accordingly, the head main bodies  110  of adjacent recording heads  100  in the Y direction can be arranged close to each other, and thus the nozzle openings  21  of the respective head main bodies  110  of the adjacent recording heads  100  can be arranged close to each other in the Y direction. 
     In the recording head  100  according to this embodiment, the leg portions  122  are provided on both sides of the holding member  120  in the X direction. However, the leg portions  122  may not be provided. In other words, the head main body  110  may adhere to the Z 1 -side surface of the holding member  120  and the bent portions  132  may be provided on both sides of the fixing plate  130  in the X direction and on both sides thereof in the Y direction. That is, the bent portions  132  may be provided over the circumference of the fixing plate  130 , in an in-plane direction of the liquid ejection surface  20   a , and the fixing plate  130  adheres over the circumference of the side surfaces of the holding member  120 . However, when the leg portions  122  are provided on both sides of the holding member  120  in the X direction, as in the case of this embodiment, the Z 1 -side end surfaces of the leg portion  122  adhere to the base portion  131  of the fixing plate  130 . As a result, the hardness of the ink jet type recording head  100  in the Z direction can be improved and it is possible to prevent moisture evaporation from occurring through the leg portions  122 . 
     The head main body  110  will be described with reference to  FIGS. 7 and 8 .  FIG. 7  is an exploded perspective view of the head main body according to this embodiment and  FIG. 8  is a cross-sectional view of the head main body, taken along a line extending in the Y direction. Needless to say, the configuration of the head main body  110  is not limited to the configuration described below. 
     The head main body  110  of this embodiment includes a pressure generation chamber  12 , the nozzle openings  21 , a manifold  95 , the pressure generation unit, and the like. Therefore, a plurality of members, such as a flow-path forming substrate  10 , a communication plate  15 , a nozzle plate  20 , a protection substrate  30 , a compliance substrate  45 , a case  40  and the like are bonded to one another, using, for example, an adhesive. 
     One surface side of the flow-path forming substrate  10  is subjected to anisotropic etching, in such a manner that a plurality of pressure generation chambers  12  partitioned by a plurality of partition walls are provided in the flow-path forming substrate  10 , in a state where the pressure generation chambers  12  are aligned in an alignment direction of a plurality of the nozzle openings  21 . In this embodiment, the alignment direction of the pressure generation chambers  12  is referred to as the Xa direction. Furthermore, a plurality (two, in this embodiment) of rows, each of which is constituted of the pressure generation chambers  12  aligned in the Xa direction, are provided in the flow-path forming substrate  10 . A row-alignment direction in which a plurality of rows of the pressure generation chambers  12  are aligned will be referred to as a Ya direction. In this embodiment, a direction perpendicular to both the Xa direction and the Ya direction is parallel to the Z direction. Furthermore, the head main body  110  of this embodiment is mounted on the head unit  101 , in a state where the Xa direction as an alignment direction of the nozzle openings  21  is inclined with respect to the X direction as the transporting direction of the recording sheet S. 
     For example, a supply path of which the opening area is smaller than that of the pressure generation chamber  12  and which imparts a flow-path resistance to the ink flowing to the pressure generation chamber  12  may be provided in the flow-path forming substrate  10  in one end side of the Ya direction of the pressure generation chamber  12 . 
     The communication plate  15  is bonded to one surface side of the flow-path forming substrate  10 . Furthermore, the nozzle plate  20  in which a plurality of nozzle openings  21  communicating with the respective pressure generation chambers  12  are provided is bonded to the communication plate  15 . In this embodiment, the Z 1  side of the nozzle plate  20 , on which the nozzle openings  21  are open, is the liquid ejection surface  20   a.    
     A nozzle communication path  16  which allows the pressure generation chamber  12  to communicate with the nozzle opening  21  is provided in the communication plate  15 . The area of the communication plate  15  is greater than that of the flow-path forming substrate  10  and the area of the nozzle plate  20  is smaller than that of the flow-path forming substrate  10 . The nozzle plate  20  has a relatively small area, as described above. As a result, it is possible to achieve a reduction in costs. 
     A first manifold  17  and a second manifold  18  which constitute a part of the manifold  95  are provided in the communication plate  15 . The first manifold  17  passes through the communication plate  15  in the Z direction. The second manifold  18  does not pass through the communication plate  15  in the Z direction. The second manifold  18  is open to the nozzle plate  20  side of the communication plate  15  and extends to the Z-direction middle portion of the nozzle plate  20 . 
     Supply communication paths  19  which communicate with one of each of the end portions of the pressure generation chambers  12  in the Y direction is provided in the communication plate  15 , in a state where the supply communication paths  19  separately respectively correspond to the pressure generation chambers  12 . The supply communication path  19  allows the second manifold  18  to communicate with the pressure generation chamber  12 . 
     The nozzle openings  21  which respectively communicate with the pressure generation chambers  12  through the nozzle communication path  16  are formed in the nozzle plate  20 . The plurality of nozzle openings  21  are aligned in the Xa direction. The aligned nozzle openings  21  form two nozzle rows which are a nozzle row a and a nozzle row b. The nozzle row a and the nozzle row b are aligned in the Ya direction. In this embodiment, each of the nozzle rows a and b is divided into two portions, and thus one nozzle row can eject liquids of two kinds. Details of this will be described below. 
     Meanwhile, a diaphragm  50  is formed on a surface of the flow-path forming substrate  10 , which is the surface on the side opposite to the communication plate  15  of the flow-path forming substrate  10 . A first electrode  60 , a piezoelectric layer  70 , and a second electrode  80  are laminated, in order, on the diaphragm  50 , in such a manner that a piezoelectric actuator  300  as the pressure generation unit of this embodiment is constituted. Generally, one electrode of the piezoelectric actuator  300  is constituted of a common electrode. The other electrodes and the piezoelectric layers are subjected to patterning such that the other electrode and the piezoelectric layer correspond to each pressure generation chamber  12 . 
     The protection substrate  30  having substantially the same size as that of the flow-path forming substrate  10  is bonded to a surface of the flow-path forming substrate  10 , which is the surface on the piezoelectric actuator  300  side. The protection substrate  30  has a hold portion  31  which is a space for protecting the piezoelectric actuator  300 . Furthermore, in the protection substrate  30 , a through-hole  32  is provided in a state where the through-hole  32  passes through the protection substrate  30  in the Z direction. An end portion of a lead electrode  90  extending from the electrode of the piezoelectric actuator  300  extends such that the end portion is exposed to the inner portion of the through-hole  32 . The lead electrode  90  and the COF substrate  98  are electrically connected in the through-hole  32 . 
     Furthermore, the case  40  which forms manifolds  95  communicating with a plurality of pressure generation chambers  12  is fixed to both the protection substrate  30  and the communication plate  15 . In a plan view, the case  40  and the communication plate  15  described above have substantially the same shape. The case  40  is bonded to the protection substrate  30  and, further, bonded to the communication plate  15  described above. Specifically, a concave portion  41  is provided on the protection substrate  30  side of the case  40 . The depth of the concave portion  41  is enough to accommodate both the flow-path forming substrate  10  and the protection substrate  30 . The opening area of the concave portion  41  is greater than that of a surface of the protection substrate  30 , which is the surface bonded to the flow-path forming substrate  10 . An opening surface of the concave portion  41 , which is the opening surface on the nozzle plate  20  side, is sealed with the communication plate  15 , in a state where the flow-path forming substrate  10  and the like are accommodated in the concave portion  41 . Accordingly, in the outer circumferential portion of the flow-path forming substrate  10 , a third manifold  42  is formed by the case  40 , the flow-path forming substrate  10 , and the protection substrate  30 . The manifold  95  of this embodiment is constituted of the third manifold  42 , the first manifold  17 , and the second manifold  18 , in which the first manifold  17  and the second manifold  18  are provided in the communication plate  15 . Liquids of two kinds can be ejected by one nozzle row, as described above. Thus, each of the first manifold  17 , the second manifold  18 , and the third manifold  42  which constitute the manifold  95  is divided into two portions, in a nozzle-row direction, that is, the Xa direction. The first manifold  17  is constituted of, for example, a first manifold  17   a  and a first manifold  17   b , as illustrated in  FIG. 7 . Similarly, each of the second manifold  18  and the third manifold  42  is also divided into two portions. Thus, the entirety of the manifold  95  is divided into two portions, in the Xa direction. 
     In this embodiment, the first manifolds  17 , the second manifolds  18 , and the third manifolds  42  which constitute the manifolds  95  are symmetrically arranged with the nozzle rows a and b interposed therebetween. In this case, the nozzle row a and the nozzle row b can eject different liquids. Needless to say, the arrangement of the manifolds is not limited thereto. 
     In this embodiment, each of the manifolds corresponding to the respective nozzle rows is divided into two portions, in the Xa direction. Accordingly, in total, four manifolds  95  are provided such that liquids of four kinds can be ejected, as described below. However, manifolds may be provided corresponding to nozzle rows a and b. Alternatively, one common manifold may be provided with respect to the two rows which are the nozzle row a and the nozzle row b. 
     A plurality (two, in this embodiment) of manifolds  95  are provided in one head main body  110 , as described above. The manifolds  95  are arranged in the same plane. The meaning of “a plurality of manifolds  95  are arranged in the same plane” implies that there is a surface capable of forming a cross-sectional surface which is parallel to the liquid ejection surface  20   a  and is shared in common by all of the manifolds  95 . A boundary surface between the case  40  and the communication plate  15 , which is an example of the cross-sectional surface parallel to the liquid ejection surface  20   a , can form a cross-sectional surface which is parallel to the liquid ejection surface  20   a  and is common to the two manifolds  95 . A plurality of manifolds  95  are arranged in the same plane, and thus it is possible to stabilize ink ejection properties. Details of this will be described below. 
     The compliance substrate  45  is provided in a surface of the communication plate  15 , in which both the first manifold  17  and the second manifold  18  are open. The openings of both the first manifold  17  and the second manifold  18  are sealed with the compliance substrate  45 . 
     In this embodiment, such a compliance substrate  45  includes a sealing film  46  and a fixing substrate  47 . The sealing film  46  is constituted of a flexible thin film (which is formed of, for example, polyphenylene sulfide (PPS) or stainless steel (SUS)). The fixing substrate  47  is constituted of a hard material, for example, metal, such as stainless metal (SUS). A part of the fixing substrate  47 , which is the portion facing the manifold  95 , is completely removed in a thickness direction and forms an opening portion  48 . Thus, one surface of the manifold  95  forms a compliance portion  49  which is a flexible portion sealed with only the sealing film  46  having flexibility. 
     The fixing plate  130  adheres to a surface of the compliance substrate  45 , which is the surface on a side opposite to the communication plate  15 . In other words, the opening area of the exposure opening portion  133  of the base portion  131  of the fixing plate  130  is greater than the area of the nozzle plate  20 . The liquid ejection surface  20   a  of the nozzle plate  20  is exposed through the exposure opening portion  133 . Needless to say, the configuration is not limited thereto. The opening area of the exposure opening portion  133  of the fixing plate  130  may be smaller than that of the nozzle plate  20  and the fixing plate  130  may abut or adhere to the liquid ejection surface  20   a  of the nozzle plate  20 . Alternatively, even when the opening area of the exposure opening portion  133  of the fixing plate  130  is smaller than that of the nozzle plate  20 , the fixing plate  130  may be provided in a state where the fixing plate  130  is not in contact with the liquid ejection surface  20   a . In other words, the meaning of “the fixing plate  130  is provided on the liquid ejection surface  20   a  side” includes both a state where the fixing plate  130  is not in contact with the liquid ejection surface  20   a  and a state where the fixing plate  130  is in contact with the liquid ejection surface  20   a.    
     An introduction path  44  is provided in the case  40 . The introduction path  44  communicates with the manifold  95  and allows ink to be supplied to the manifold  95 . In addition, a connection port  43  is provided in the case  40 . The connection port  43  communicates with the through-hole  32  of the protection substrate  30  and the COF substrate  98  is inserted therethrough. 
     In the head main body  110  configured as described above, when ink is ejected, ink is fed from a storage unit through the introduction path  44  and the flow path from the manifold  95  to the nozzle openings  21  is filled with the ink. Then, voltage is applied, in accordance with signals from the driving circuit  97 , to each piezoelectric actuator  300  corresponding to the pressure generation chamber  12 , in such a manner that the diaphragm, along with the piezoelectric actuator  300 , is flexibly deformed. As a result, the pressure in the pressure generation chamber  12  increases, and thus ink droplets are ejected from predetermined nozzle openings  21 . 
     Here, details of the configuration in which the alignment direction of the nozzle openings  21  constituting the nozzle row of the head main body  110  is inclined with respect to the X direction as the transporting direction of the recording sheet S will be described with reference to  FIGS. 5 and 9 .  FIG. 9  is a schematic view explaining the arrangement of the nozzle openings of the head main body according to this embodiment. 
     The plurality of the head main bodies  110  are fixed in a state where, in the in-plane direction of the liquid ejection surface  20   a , the nozzle rows a and b are inclined with respect to the X direction as the transporting direction of the recording sheet S. The nozzle row referred to in this case is a row of a plurality of nozzle openings  21  aligned in a predetermined direction. In this embodiment, two rows which are the nozzle rows a and b, each of which is constituted of a plurality of nozzle openings  21  aligned in the Xa direction as the predetermined direction, are provided in the liquid ejection surface  20   a . The Xa direction intersects the X direction at an angle greater than 0° and less than 90°. In this case, it is preferable that the Xa direction intersect the X direction at an angle greater than 0° and less than 45°. In this case, upon comparison with in the case where the Xa direction intersects the X direction at an angle greater than 45° and less than 90°, a gap D 1  between adjacent nozzle openings  21  in the Y direction can be further reduced. As a result, the recording head  100  can have high definition in the Y direction. Needless to say, the Xa direction may intersect the X direction at an angle greater than 45° and less than 90°. 
     The meaning of “the Xa direction intersects the X direction at the angle greater than 0° and less than 45°” implies that, in the plane of the liquid ejection surface  20   a , the nozzle row is inclined closer to the X direction than a straight line intersecting the X direction at 45°. The gap D 1  referred to in this case is a gap between the nozzle openings  21  of the nozzle rows a and b, in a state where the nozzle openings  21  are projected in the X direction, with respect to an imaginary line in the Y direction. Furthermore, a gap between the nozzle openings  21  of the nozzle rows a and b which are projected in the Y direction, with respect to an imaginary line in the X direction, is set to a gap D 2 . 
     In this embodiment, liquids of two kinds can be ejected from one nozzle row and liquids of four kinds can be ejected from two nozzle rows, as illustrated in  FIG. 9 . In other words, when it is assumed that inks of four colors are used, a black ink Bk and a magenta ink M are can be ejected from the nozzle row a and a cyan ink C and a yellow ink Y can be ejected from the nozzle row b. Furthermore, the nozzle row a and the nozzle row b have the same number of nozzle openings  21 . The Y-direction positions of the nozzle openings  21  of the nozzle row a and the Y-direction positions of the nozzle openings  21  of the nozzle row b overlap in the X direction. 
     Head main bodies  110   a  to  110   c  have the nozzle rows a and b. The head main bodies  110   a  to  110   c  are arranged close to each other in the Y direction, and thus the nozzle openings  21  of adjacent head main bodies  110  in the Y direction are aligned in a state where the nozzle openings  21  overlap in the X direction. Accordingly, a part of the nozzle row a of the head main body  110   a , which is a portion ejecting the magenta ink M, and a part of the nozzle row b of the head main body  110   a , which is a portion ejecting the yellow ink Y, overlap, in the X direction, with a part of the nozzle row a of the head main body  110   b , which is a portion ejecting the black ink Bk, and a part of the nozzle row b of the head main body  110   b , which is a portion ejecting the cyan ink C. Therefore, lines of four colors are aligned in one row in the X direction, and thus a color image can be printed. Similarly, in the case of adjacent head main bodies  110   b  and  110   c  in the Y direction, the nozzle openings  21  are aligned in a state where the nozzle openings  21  overlap in the X direction. 
     At least some of nozzle openings  21  of nozzle rows of adjacent head main bodies  110 , which are the nozzle rows ejecting ink of the same color, overlap in the X direction. As a result, the image quality in a joining portion between the head main bodies  110  can be improved. In other words, one nozzle opening  21  of the nozzle row a of the head main body  110   a , which is the nozzle row ejecting the magenta ink M, and one nozzle opening  21  of the nozzle row a of the head main body  110   b , which is the nozzle row ejecting the magenta ink M, overlap in the X direction. Ejection operations through the two overlapping nozzle openings  21  are controlled, in such a manner that image quality deterioration, such as banding and streaks, can be prevented from occurring in the joining portion between the adjacent head main bodies  110 . In an example illustrated in  FIG. 9 , only one nozzle opening  21  of one head main body  110  and one nozzle openings  21  of the other head main body  110  overlap in the X direction. However, two or more nozzle openings  21  of one head main body  110  and two or more nozzle openings  21  of the other head main body  110  may overlap in the X direction. 
     Needless to say, the arrangement relating to colors may not be limited thereto. Although not particularly illustrated, the black ink Bk, the magenta ink M, the cyan ink C, and the yellow ink Y can be ejected from, for example, one nozzle row. 
     As described above, the head unit  101  is constituted by fixing four recording heads  100  to the head fixing substrate  102 , in which each recording head  100  has a plurality of head main bodies  110 . Parts of nozzle rows of adjacent recording heads  100  overlap in the X direction, as illustrated by a straight line L in  FIG. 5 . In other words, similarly to the relationship between adjacent head main bodies  110  in one recording head  100 , adjacent head main bodies  110  of adjacent recording heads  100  in the Y direction are arranged close to each other in the Y direction, and thus a color image can be printed in a portion between the adjacent recording heads  100  and, further, the image quality in the joining portion between the adjacent recording heads  100  can be improved. Needless to say, the number of overlapping nozzle openings  21  between adjacent recording heads  100 , which overlap in the X direction, is not necessarily the same as the number of overlapping nozzle openings  21  between adjacent head main bodies  110  in one recording head  100 , which overlap in the X direction. 
     As described above, the nozzle rows between adjacent head main bodies  110  and the nozzle rows between adjacent recording heads  100  partially overlap in the X direction, and thus the image quality in the joining portion can be improved. 
     It is preferable that, in a portion between nozzle openings  21  of nozzle rows, which are adjacent in the Xa direction, a pitch between adjacent nozzles and the an angle between the X direction and the Xa direction be set to satisfy a condition in which the relationship between the gap D 1  in the X direction and the gap D 2  in the Y direction satisfies an integer ratio. In this case, when an image is printed in accordance with image data which is constituted of pixels having a matrix shape in which the pixels are arranged in both the X direction and the Y direction, it is easy to pair each nozzle with each pixel. Needless to say, the relationship is not limited to the relationship of an integer ratio. 
     In a plan view seen from the liquid ejection surface  20   a  side, the recording head  100  of this embodiment has a substantially parallelogram shape, as illustrated in  FIG. 5 . The reason for this is as follows. The Xa direction as the alignment direction of the nozzle openings  21  which constitute the nozzle rows a and b of each head main body  110  is inclined with respect to the X direction as the transporting direction of the recording sheet S. Furthermore, the recording head  100  is formed in a shape parallel to the Xa direction as an inclined direction of the nozzle rows a and b. In other words, the fixing plate  130  has a substantially parallelogram shape. Needless to say, in a plan view seen from the liquid ejection surface  20   a  side, the shape of the recording head  100  is not limited to a substantially parallelogram. The recording head  100  may have a trapezoidal-rectangular shape, a polygonal shape, or the like. 
     An example in which two nozzle rows are provided in one head main body is described in the embodiment described above. However, needless to say, even when three or more nozzle rows are provided, the same effects described above may be obtained. Furthermore, when two nozzle rows are provided in one head main body  110 , as in the case of this embodiment, nozzle openings  21  of the two nozzle rows can be arranged in a portion between two manifolds  95  respectively corresponding to the two nozzle rows, as illustrated in  FIG. 7 . Thus, a gap between the two nozzle rows in the Ya direction can be reduced, compared to in the case where nozzle openings  21  of a plurality of nozzle rows are arranged on the same side with respect to manifolds respectively corresponding to the plurality of nozzle rows. As a result, in the nozzle plate  20 , the area required for providing two nozzle rows can be reduced. In addition, it is easy to connect the respective piezoelectric actuators  300  corresponding to two nozzle rows and the respective COF substrates  98 . 
     In this embodiment, the nozzle row a and the nozzle row b have the same number of nozzle openings  21 . Accordingly, in the nozzle rows, the same number of nozzle openings  21  can overlap in the X direction, and thus it is possible to effectively eject liquid. However, nozzle rows do not have necessarily the same number of nozzle openings. Furthermore, the nozzle rows a and b may eject liquids of the same kind. In other words, the nozzle rows a and b may eject, for example, ink of the same color. 
     In this embodiment, it is preferable that the head main body  110  have s nozzle plate  20  having two nozzle rows. In this case, nozzle rows can be arranged with higher precision. Needless to say, one nozzle row may be provided in each nozzle plate  20 . The nozzle plate  20  is constituted of a stainless-steel (SUS) plate, a silicon substrate, or the like. 
     Details of the flow-path member  200  according to this embodiment will be described with reference to  FIGS. 10 to 16 .  FIG. 10  is a plan view of a first flow-path member as the flow-path member  200 ,  FIG. 11  is a plan view of a second flow-path member as the flow-path member  200 , and  FIG. 12  is a plan view of a third flow-path member as the flow-path member  200 .  FIG. 13  is a bottom view of the third flow-path member.  FIG. 14  is a cross-sectional view of  FIGS. 10 to 13 , taken along a line XIV-XIV, and  FIG. 15  is a cross-sectional view of  FIGS. 10 to 13 , taken along a line XV-XV.  FIG. 16  is a cross-sectional view of  FIGS. 10 to 15 , taken along a line XVI-XVI.  FIGS. 10 to 12  are plan views seen from the Z 2  side and  FIG. 13  is a bottom view seen from the Z 1  side. 
     A flow path  240  through which ink flows is provided in the flow-path member  200 . In this embodiment, the flow-path member  200  includes three flow-path members stacked in the Z direction and a plurality of flow paths  240 . The three flow-path members are a first flow-path member  210 , a second flow-path member  220 , and a third flow-path member  230 . In the Z direction, the first flow-path member  210 , the second flow-path member  220 , and the third flow-path member  230  are stacked in order from the holding member  120  side (see  FIG. 2 ) to the head main body  110  side. Although not particularly illustrated, the first flow-path member  210 , the second flow-path member  220 , and the third flow-path member  230  are fixed in an adhesive manner, using an adhesive. However, the configuration is not limited thereto. The first flow-path member  210 , the second flow-path member  220 , and the third flow-path member  230  may be fixed to each other, using a fixing unit, such as a screw. Furthermore, although the material for forming the flow-path member is not particularly limited, the flow-path member can be constituted of, for example, metal, such as SUS, or resin. 
     In the flow path  240 , one end is an introduction flow path  280  and the other end is a connection portion  290 . Ink supplied from a member (which is the holding member  120 , in this embodiment) upstream from the flow path  240  and is introduced through the introduction flow path  280 . The connection portion  290  functions as an output port through which the ink is supplied to the head. In this embodiment, four flow paths  240  are provided. In each flow path  240 , ink is supplied to one introduction flow path  280 . In the middle of each flow path  240 , the flow path  240  branches into a plurality of flow paths. Therefore, in each flow path  240 , the ink is supplied to the head main body  110  through a plurality of connection portions  290 . 
     Some of the four flow paths  240  are first flow paths  241  and the others are second flow paths  242 . In this embodiment, two first flow paths  241  and two second flow paths  242  are provided. One of the two first flow paths  241  is referred to as a first flow path  241   a  and the other is referred to as a first flow path  241   b . Hereinafter, the first flow path  241  indicates both the first flow path  241   a  and the first flow path  241   b . The second flow path  242  has a similar configuration. 
     The first flow path  241  includes a first introduction flow path  281 . The first introduction flow path  281  connects a first distribution flow path  251  of the first flow path  241  and a flow path (which is the flow path of the holding member  120 , in this embodiment) upstream from the flow-path member  200 . The first distribution flow path  251  will be described below. In this embodiment, each of two first flow paths  241   a  and  241   b  has a first introduction flow path  281   a  and a first introduction flow path  281   b.    
     Specifically, the first introduction flow path  281   a  is constituted of a through-hole  211  and a through-hole  221  which communicate with each other. The through-hole  211  is open to the top surface of a protrusion portion  212  which is provided on the Z 2 -side surface of the first flow-path member  210  and the through-hole  211  passes through, in the Z direction, both the first flow-path member  210  and the protrusion portion  212 . The through-hole  221  passes through the second flow-path member  220  in the Z direction. The first introduction flow path  281   b  has a similar configuration. Hereinafter, the first introduction flow path  281  indicates both the first introduction flow path  281   a  and the first introduction flow path  281   b.    
     The second flow path  242  includes a second introduction flow path  282 . The second introduction flow path  282  connects a second distribution flow path  252  of the second flow path  242  and a flow path (which is the flow path of the holding member  120 , in this embodiment) upstream from the flow-path member  200 . The second distribution flow path  252  will be described below. In this embodiment, each of two second flow paths  242   a  and  242   b  has a second introduction flow path  282   a  and a second introduction flow path  282   b.    
     Specifically, the second introduction flow path  282   a  is a through-hole open on the top surface of a protrusion portion  212  which is provided on the Z 2 -side surface of the first flow-path member  210 . The second introduction flow path  282   a  passes through, in the Z direction, both the first flow-path member  210  and the protrusion portion  212 . The second introduction flow path  282   b  has a similar configuration. Hereinafter, the second introduction flow path  282  indicates both the second introduction flow path  282   a  and the second introduction flow path  282   b.    
     The introduction flow path  280  indicates all of the four introduction flow paths described above. 
     In this embodiment, in a plan view illustrated in  FIG. 10 , the first introduction flow path  281   a  is disposed in the vicinity of an upper left corner of the first flow-path member  210  and the first introduction flow path  281   b  is disposed in the vicinity of a lower right corner of the first flow-path member  210 . In the plan view illustrated in  FIG. 10 , the second introduction flow path  282   a  is disposed in the vicinity of a upper right corner of the first flow-path member  210  and the second introduction flow path  282   b  is disposed in the vicinity of a lower left corner of the first flow-path member  210 . 
     The first flow path  241  includes the first distribution flow path  251  which is formed by both the second flow-path member  220  and the third flow-path member  230 . The first distribution flow path  251  is a part of the first flow path  241 , through which ink flows in a direction parallel to the liquid ejection surface  20   a . In this embodiment, two first flow paths  241  are formed, and thus two first distribution flow paths  251  are formed. One of the two first distribution flow paths  251  is referred to as a first distribution flow path  251   a  and the other is referred to as a first distribution flow path  251   b.    
     A distribution groove portion  226   a  and a distribution groove portion  231   a  are matched and sealed, in such a manner that the first distribution flow path  251   a  is formed. The distribution groove portion  226   a  is formed on the Z 1 -side surface of the second flow-path member  220  and extends in the Y direction. The distribution groove portion  231   a  is formed on the Z 2 -side surface of the third flow-path member  230  and extends in the Y direction. A distribution groove portion  226   b  and a distribution groove portion  231   b  are matched and sealed, in such a manner that the first distribution flow path  251   b  is formed. The distribution groove portion  226   b  is formed on the Z 1 -side surface of the second flow-path member  220  and extends in the Y direction. The distribution groove portion  231   b  is formed on the Z 2 -side surface of the third flow-path member  230  and extends in the Y direction. 
     The first distribution flow path  251   a  is constituted of both the distribution groove portions  226   a  in the second flow-path member  220  and the distribution groove portion  231   a  in the third flow-path member  230  and the first distribution flow path  251   b  is constituted of both the distribution groove portion  226   b  in the second flow-path member  220  and the distribution groove portion  231   b  in the third flow-path member  230 . As a result, the cross-sectional areas of the first distribution flow paths  251   a  and  251   b  are widened, and thus pressure losses in the first distribution flow paths  251   a  and  251   b  are reduced. The first distribution flow path  251   a  may be constituted of only the distribution groove portion  226   a  in the second flow-path member  220  and the first distribution flow path  251   b  may be constituted of only the distribution groove portion  226   b  in the second flow-path member  220 . Alternatively, the first distribution flow path  251   a  may be constituted of only the distribution groove portion  231   a  in the third flow-path member  230  and the first distribution flow path  251   b  may be constituted of only the distribution groove portion  231   b  in the third flow-path member  230 . The distribution groove portions  226   a  and  226   b  are formed in only the second flow-path member  220  on the Z 2  side, in such a manner that degrees of freedom in the arrangement of the first flow path  241  can be improved while preventing the first distribution flow paths  251   a  and  251   b  from interfering with the COF substrate  98  of which the Xa-direction width is reduced as the COF substrate  98  extends from the Z 1  side to the Z 2  side, as described below. 
     The first distribution flow path  251   a  and the first distribution flow path  251   b  are disposed in both areas located X-directionally outside the opening portion  201  (in other words, a third opening portion  235 ) through which the COF substrate  98  is inserted. 
     The second flow path  242  includes the second distribution flow path  252  which is formed by both the first flow-path member  210  and the second flow-path member  220 . The second distribution flow path  252  is a part of the second flow path  242 , through which ink flows in a direction parallel to the liquid ejection surface  20   a . In this embodiment, two second flow paths  242  are formed, and thus two second distribution flow paths  252  are formed. One of the two second distribution flow paths  252  is referred to as a second distribution flow path  252   a  and the other is referred to as a second distribution flow path  252   b.    
     A distribution groove portion  213   a  and a distribution groove portion  222   a  are matched and sealed, in such a manner that the second distribution flow path  252   a  is formed. The distribution groove portion  213   a  is formed on the Z 1 -side surface of the first flow-path member  210  and extends in the Y direction. The distribution groove portion  222   a  is formed on the Z 2 -side surface of the second flow-path member  220  and extends in the Y direction. A distribution groove portion  213   b  and a distribution groove portion  222   b  are matched and sealed, in such a manner that the second distribution flow path  252   b  is formed. The distribution groove portion  213   b  is formed on the Z 1 -side surface of the first flow-path member  210  and extends in the Y direction. The distribution groove portion  222   b  is formed on the Z 2 -side surface of the second flow-path member  220  and extends in the Y direction. 
     The second distribution flow path  252   a  is constituted of both the distribution groove portions  213   a  in the first flow-path member  210  and the distribution groove portion  222   a  in the second flow-path member  220  and the second distribution flow path  252   b  is constituted of both the distribution groove portion  213   b  in the first flow-path member  210  and the distribution groove portion  222   b  in the second flow-path member  220 . As a result, the cross-sectional areas of the second distribution flow paths  252   a  and  252   b  are widened, and thus pressure losses in the second distribution flow paths  252   a  and  252   b  are reduced. The second distribution flow path  252   a  may be constituted of only the distribution groove portion  213   a  in the first flow-path member  210  and the second distribution flow path  252   b  may be constituted of only the distribution groove portion  213   b  in the first flow-path member  210 . Alternatively, the second distribution flow path  252   a  may be constituted of only the distribution groove portion  222   a  in the second flow-path member  220  and the second distribution flow path  252   b  may be constituted of only the distribution groove portion  222   b  in the second flow-path member  220 . The distribution groove portions  222   a  and  222   b  are formed in only the first flow-path member  210  on the Z 2  side, in such a manner that, similarly to in the case of the first distribution flow paths  251   a  and  251   b  described above, degrees of freedom in the arrangement of the second flow path  242  can be improved while preventing the second distribution flow paths  252   a  and  252   b  from interfering with the COF substrate  98 . 
     The second distribution flow path  252   a  and the second distribution flow path  252   b  are disposed in both areas located X-directionally outside the opening portion  201  (in other words, a second opening portion  225 ) through which the COF substrate  98  is inserted. 
     Hereinafter, the first distribution flow path  251  indicates both the first distribution flow path  251   a  and the first distribution flow path  251   b . Furthermore, the second distribution flow path  252  indicates both the second distribution flow path  252   a  and the second distribution flow path  252   b . In addition, the  250  indicates all of the four distribution flow paths described above. 
     The first distribution flow path  251  and the second distribution flow path  252  are not arranged on the same plane, as described above. In other words, the first distribution flow path  251  and the second distribution flow path  252  are located at different positions in the Z direction. The arrangement relating to both the first distribution flow path  251  and the second distribution flow path  252  will be described with reference to  FIG. 19 .  FIG. 19  is a side view of the recording head, in which the positional relationship between the first distribution flow path  251  and the second distribution flow path  252  is schematically illustrated. 
     The meaning of “the first distribution flow path  251  and the second distribution flow path  252  are located at different positions in the Z direction” implies that, in a plane K perpendicular to the liquid ejection surface  20   a , projection images L 1  and L 2  obtained by orthogonally projecting both the first distribution flow path  251  and the second distribution flow path  252  do not satisfy a relationship in which one of the projection images does not include the other. In other words, when the projection image L 1  and the projection image L 2  do not overlap or the projection image L 1  and the projection image L 2  partially overlap, the first distribution flow path  251  and the second distribution flow path  252  are located at different positions in the Z direction. In contrast, when the projection image L 1  and the projection image L 2  overlap each other or one projection image includes the other projection image, the first distribution flow path  251  and the second distribution flow path  252  are not located at different positions in the Z direction. 
     Furthermore, the manifold  95 , the first distribution flow path  251 , and the second distribution flow path  252  are not formed on the same plane. In other words, a projection image L 3  obtained by orthogonally projecting the manifold  95  onto the plane K does not overlap the projection images L 1  and L 2 . 
     Returning to  FIGS. 10 to 16 , the first distribution flow path  251  and the second distribution flow path  252  are disposed at different positions in the Z direction, as described above. As a result, the size of the flow-path member  200  in the in-plane direction parallel to the liquid ejection surface  20   a  can be reduced, compared to in the case where the first distribution flow path  251  and the second distribution flow path  252  are formed on the same plane. Preferably, the first distribution flow path  251  and the second distribution flow path  252  are arranged in a state where, when the first distribution flow path  251  and the second distribution flow path  252  are orthogonally projected onto the liquid ejection surface  20   a , at least parts of the projection images of the distribution flow paths overlap. In this case, the size of the flow-path member  200  in the in-plane direction parallel to the liquid ejection surface  20   a  can be reduced. 
     In the first flow path  241  of this embodiment, one introduction flow path  280  branches into a plurality of connection portions  290 . In other words, the first distribution flow path  251  branches into a plurality of first bifurcation flow paths  261 , in the same surface (which is a boundary surface in which the second flow-path member  220  and the third flow-path member  230  are bonded to each other). 
     In this embodiment, the first distribution flow path  251  branches into six first bifurcation flow paths  261 , in the surface (which is a boundary surface between the second flow-path member  220  and the third flow-path member  230 ) parallel to the liquid ejection surface  20   a . The six first bifurcation flow paths  261  branched from the first distribution flow path  251   a  are referred to as first bifurcation flow paths  261   a   1  to  261   a   6 . Hereinafter, the first bifurcation flow path  261   a  indicates all of the six bifurcation flow paths connected to the first bifurcation flow path  261   a.    
     Similarly, six first bifurcation flow paths  261  branched from the first distribution flow path  251   b  are referred to as first bifurcation flow paths  261   b   1  to  261   b   6 . Hereinafter, the first bifurcation flow path  261   b  indicates all of the six bifurcation flow paths connected to the first bifurcation flow path  261   b . In addition, the first bifurcation flow path  261  indicates all of the twelve bifurcation flow paths connected to the first bifurcation flow paths  261   a  and  261   b.    
     Reference letters and numerals corresponding to the first bifurcation flow paths  261   a   2  to  261   a   5  of the six first bifurcation flow paths  261   a   1  to  261   a   6  aligned in the Y direction are omitted in the accompanying drawings. However, it is assumed that the first bifurcation flow paths  261   a   2  to  261   a   5  are aligned in order from the Y 1  side to the Y 2  side. The first bifurcation flow paths  261   b   1  to  261   b   6  have a similar configuration to that described above. 
     Specifically, a plurality of branch groove portions  232   a  which communicate with the distribution groove portion  231   a  and extend to the opening portion  201  side are provided in the Z 2 -side surface of the third flow-path member  230 . A plurality of branch groove portions  227   a  which communicate with the distribution groove portion  226   a  and extend to the opening portion  201  side are provided in the Z 1 -side surface of the second flow-path member  220 . The branch groove portion  227   a  and the branch groove portion  232   a  are sealed in a state where the branch groove portion  227   a  and the branch groove portion  232   a  face each other, in such a manner that the first bifurcation flow path  261   a  is formed. 
     A plurality of branch groove portions  232   b  which communicate with the distribution groove portion  231   b  and extend to the opening portion  201  side are provided in the Z 2 -side surface of the third flow-path member  230 . A plurality of branch groove portions  227   b  which communicate with the distribution groove portion  226   b  and extend to the opening portion  201  side are provided in the Z 1 -side surface of the second flow-path member  220 . The branch groove portion  227   b  and the branch groove portion  232   b  are sealed in a state where the branch groove portion  227   b  and the branch groove portion  232   b  face each other, in such a manner that the first bifurcation flow path  261   b  is formed. 
     The first bifurcation flow path  261   a  is constituted of both the branch groove portions  227   a  in the second flow-path member  220  and the branch groove portion  232   a  in the third flow-path member  230  and the first bifurcation flow path  261   b  is constituted of both the branch groove portion  227   b  in the second flow-path member  220  and the branch groove portion  232   b  in the third flow-path member  230 . As a result, the cross-sectional areas of the first bifurcation flow paths  261   a  and  261   b  are widened, and thus pressure losses in the first bifurcation flow paths  261   a  and  261   b  are reduced. The first bifurcation flow path  261   a  may be constituted of only the branch groove portion  227   a  in the second flow-path member  220  and the first bifurcation flow path  261   b  may be constituted of only the branch groove portion  227   b  in the second flow-path member  220 . Alternatively, the first bifurcation flow path  261   a  may be constituted of only the branch groove portion  232   a  in the third flow-path member  230  and the first bifurcation flow path  261   b  may be constituted of only the branch groove portion  232   b  in the third flow-path member  230 . For example, the branch groove portions  227   a  and  227   b  are formed in only the second flow-path member  220  on the Z 2  side. As a result, in an area Q which is inclined in the Ya direction, and thus the Ya-direction width increases as the area Q extends from the Z 1  side to the Z 2  side, as described below, degrees of freedom in the arrangement of the first flow path  241  can be improved while preventing interference with the COF substrate  98 . Furthermore, the branch groove portions  232   a  and  232   b  are formed in only the third flow-path member  230  on the Z 1  side. As a result, in an area P of which the width in the Ya direction increases as the area P extends from the Z 2  side to the Z 1  side, degrees of freedom in the arrangement of the first flow path  241  can be improved while preventing interference with the COF substrate  98 . 
     In the second flow path  242 , one introduction flow path  280  branches into a plurality of connection portions  290 . The second distribution flow path  252  branches into a plurality of second bifurcation flow paths  262 , in the same surface (which is a boundary surface in which the first flow-path member  210  and the second flow-path member  220  are bonded to each other). Details of this will be described below. 
     In this embodiment, the second distribution flow path  252  branches into six second bifurcation flow paths  262 , in the surface (which is a boundary surface between the first flow-path member  210  and the second flow-path member  220 ) parallel to the liquid ejection surface  20   a . The six second bifurcation flow paths  262  branched from the second distribution flow path  252   a  are referred to as second bifurcation flow paths  262   a   1  to  262   a   6 . 
     Similarly, six second bifurcation flow paths  262  branched from the second distribution flow path  252   b  are referred to as second bifurcation flow paths  262   b   1  to  262   b   6 . 
     Hereinafter, the second bifurcation flow path  262   a  indicates all of the six bifurcation flow paths connected to the second bifurcation flow path  262   a . The second bifurcation flow path  262   b  indicates all of the six bifurcation flow paths connected to the second bifurcation flow path  262   b . The second bifurcation flow path  262  indicates all of the twelve bifurcation flow paths connected to the second bifurcation flow paths  262   a  and  262   b . Furthermore, the bifurcation flow path  260  indicates all of the twenty-four bifurcation flow paths described above. 
     Reference letters and numerals corresponding to second bifurcation flow paths  262   a   2  to  262   a   5  of the six second bifurcation flow paths  262   a   1  to  262   a   6  aligned in the Y direction are omitted in the accompanying drawings. However, it is assumed that the second bifurcation flow paths  262   a   2  to  262   a   5  are aligned in order from the Y 1  side to the Y 2  side. The second bifurcation flow paths  262   b   1  to  262   b   6  have a similar configuration to that described above. 
     Specifically, a plurality of branch groove portions  214   a  which communicate with the distribution groove portion  213   a  and extend to the opening portion  201  side are provided in the Z 1 -side surface of the first flow-path member  210 . A plurality of branch groove portions  223   a  which communicate with the distribution groove portion  222   a  and extend to the opening portion  201  side are provided in the Z 2 -side surface of the second flow-path member  220 . The branch groove portion  214   a  and the branch groove portion  223   a  are sealed in a state where the branch groove portion  214   a  and the branch groove portion  223   a  face to each other, in such a manner that the second bifurcation flow path  262   a  is formed. 
     A plurality of branch groove portions  214   b  which communicate with the distribution groove portion  213   b  and extend to the opening portion  201  side are provided in the Z 1 -side surface of the first flow-path member  210 . A plurality of branch groove portions  223   b  which communicate with the distribution groove portion  222   b  and extend to the opening portion  201  side are provided in the Z 2 -side surface of the second flow-path member  220 . The branch groove portion  214   b  and the branch groove portion  223   b  are sealed in a state where the branch groove portion  214   b  and the branch groove portion  223   b  face each other, in such a manner that the second bifurcation flow path  262   b  is formed. 
     The second bifurcation flow path  262   a  is constituted of both the branch groove portions  214   a  in the first flow-path member  210  and the branch groove portion  223   a  in the second flow-path member  220  and the second bifurcation flow path  262   b  is constituted of both the branch groove portion  214   b  in the first flow-path member  210  and the branch groove portion  223   b  in the second flow-path member  220 . As a result, the cross-sectional areas of the second bifurcation flow paths  262   a  and  262   b  are widened, and thus pressure losses in the second bifurcation flow paths  262   a  and  262   b  are reduced. The second bifurcation flow path  262   a  may be constituted of only the branch groove portion  214   a  in the first flow-path member  210  and the second bifurcation flow path  262   b  may be constituted of only the branch groove portion  214   b  in the first flow-path member  210 . Alternatively, the second bifurcation flow path  262   a  may be constituted of only the branch groove portion  223   a  in the second flow-path member  220  and the second bifurcation flow path  262   b  may be constituted of only the branch groove portion  223   b  in the second flow-path member  220 . For example, the branch groove portions  214   a  and  214   b  are formed in only the first flow-path member  210  on the Z 2  side. As a result, in the area Q which is inclined in the Ya direction, and thus the Ya-direction width increases as the area Q extends from the Z 1  side to the Z 2  side, as described below, degrees of freedom in the arrangement of the second flow path  242  can be improved while preventing interference with the COF substrate  98 . Furthermore, the branch groove portions  223   a  and  223   b  are formed in only the second flow-path member  220  on the Z 1  side. As a result, in the area P of which the width in the Ya direction increases as the area P extends from the Z 2  side to the Z 1  side, degrees of freedom in the arrangement of the first flow path  241  can be improved while preventing interference with the COF substrate  98 . 
     An end portion of the first bifurcation flow path  261 , which is the end portion on a side opposite to the first distribution flow path  251 , is connected to a first vertical flow path  271 . Specifically, the first vertical flow path  271  is formed as a through-hole which passes through the third flow-path member  230  in the Z direction. 
     In this embodiment, vertical flow paths are respectively connected to the first bifurcation flow paths  261   a   1  to  261   a   6  and  261   b   1  to  261   b   6 . In other words, in total, twelve first vertical flow paths  271   a   1  to  271   a   6  and  271   b   1  to  271   b   6  are respectively connected to the first bifurcation flow paths. 
     Similarly, an end portion of the second bifurcation flow path  262 , which is the end portion on a side opposite to the second distribution flow path  252 , is connected to a second vertical flow path  272 . Specifically, a through-hole  224  is provided in the second flow-path member  220 , in a state where the through-hole  224  passes through the second flow-path member  220  in the Z direction. A through-hole  233  is provided in the third flow-path member  230 , in a state where the through-hole  233  passes through the third flow-path member  230  in the Z direction. The through-hole  224  and the through-hole  233  communicate with each other, in such a manner that the second vertical flow path  272  is formed. 
     In this embodiment, twelve second vertical flow paths  272   a   1  to  272   a   6  and  272   b   1  to  272   b   6  are respectively connected to second bifurcation flow paths  262   a   1  to  262   a   6  and  262   b   1  to  262   b   6 . 
     Hereinafter, a first vertical flow path  271   a  indicates the first vertical flow paths  271   a   1  to  271   a   6 . A first vertical flow path  271   b  indicates the first vertical flow paths  271   b   1  to  271   b   6 . The first vertical flow path  271  indicates all of the first vertical flow paths  271   a  and the first vertical flow paths  271   b.    
     Similarly, a second vertical flow path  272   a  indicates the second vertical flow paths  272   a   1  to  272   a   6 . A second vertical flow path  272   b  indicates the second vertical flow paths  272   b   1  to  272   b   6 . The second vertical flow path  272  indicates all of the second vertical flow paths  272   a  and the second vertical flow paths  272   b.    
     Furthermore, a vertical flow path  270  indicates all of the twenty-four vertical flow paths described above. 
     Reference letters and numerals corresponding to the first vertical flow paths  271   a   2  to  271   a   5  of the six first vertical flow paths  271   a   1  to  271   a   6  aligned in the Y direction are omitted in the accompanying drawings. However, it is assumed that the first vertical flow paths  271   a   2  to  271   a   5  are aligned in order from the Y 1  side to the Y 2  side. The first vertical flow paths  271   b   1  to  271   b   6 , the second vertical flow paths  272   a   1  to  272   a   6 , and the second vertical flow paths  272   b   1  to  272   b   6  have a similar configuration to that described above. 
     The vertical flow path  270  described above has the connection portion  290  which is an opening on the Z 1  side of the third flow-path member  230 . The connection portion  290  communicates with the introduction path  44  provided in the head main body  110 . Details of this will be described below. 
     In this embodiment, the first vertical flow paths  271   a   1  to  271   a   6  respectively have first connection portions  291   a   1  to  291   a   6  which are openings on the Z 1  side of the third flow-path member  230 . In addition, the first vertical flow paths  271   b   1  to  271   b   6  respectively have first connection portions  291   b   1  to  291   b   6  which are openings on the Z 1  side of the third flow-path member  230 . Similarly, the second vertical flow paths  272   a   1  to  272   a   6  respectively have second connection portions  292   a   1  to  292   a   6  which are openings on the Z 1  side of the third flow-path member  230 . In addition, the second vertical flow paths  272   b   1  to  272   b   6  respectively have second connection portions  292   b   1  to  292   b   6  which are openings on the Z 1  side of the third flow-path member  230 . 
     The first connection portion  291   a   1 , the first connection portion  291   b   1 , the second connection portion  292   a   1 , and the second connection portion  292   b   1  are connected to one of the six head main bodies  110 . The first connection portions  291   a   2  to  291   a   6 , the first connection portions  291   b   2  to  291   b   6 , the second connection portions  292   a   2  to  292   a   6 , and the second connection portions  292   b   2  to  292   b   6  have a similar configuration to that described above. In other words, the first flow path  241   a , the first flow path  241   b , the second flow path  242   a , and the second flow path  242   b  are connected to one head main body  110 . 
     Hereinafter, the first connection portion  291   a  indicates the first connection portions  291   a   1  to  291   a   6 . The first connection portion  291   b  indicates the first connection portions  291   b   1  to  291   b   6 . A first connection portion  291  indicates all of the first connection portions  291   a  and the first connection portions  291   b.    
     Similarly, the second connection portion  292   a  indicates the second connection portions  292   a   1  to  292   a   6 . The second connection portion  292   b  indicates the second connection portion  292   b   1  to  292   b   6 . A second connection portion  292  indicates all of the second connection portions  292   a  and the second connection portions  292   b.    
     Furthermore, a connection portion  290  indicates all of the twenty-four connection portions described above. 
     The flow-path member  200  according to this embodiment includes four flow paths  240 , in other words, the first flow path  241   a , the first flow path  241   b , a second flow path  242   a , and a second flow path  242   b , as described above. In each flow path  240 , a part extending from the introduction flow path  280  as an ink inlet port to a distribution flow path  250  constitutes one flow path and the distribution flow path  250  branches into bifurcation flow paths  260 . The bifurcation flow paths  260  are connected to a plurality of head main bodies  110  via both the vertical flow paths  270  and the connection portions  290 . 
     In this embodiment, a black ink Bk, a magenta ink M, a cyan ink C, and a yellow ink Y are used. The cyan ink C, the yellow ink Y, the black ink Bk, and the magenta ink M are respectively supplied from the liquid storage units (not illustrated) to the first flow path  241   a , the first flow path  241   b , the second flow path  242   a , and the second flow path  242   b . The color inks respectively flow through the first flow path  241   a , the first flow path  241   b , the second flow path  242   a , and the second flow path  242   b , and then the color inks are supplied to the head main bodies  110 . 
     In addition, the opening portion  201  is provided in the flow-path member  200 . The COF substrate  98  provided in the head main body  110  is inserted through the opening portion  201 . In this embodiment, the first opening portion  215  is provided in the first flow-path member  210 . The first opening portion  215  is inclined with respect to the Z direction and passes through the first flow-path member  210 . The second opening portion  225  is provided in the second flow-path member  220 , the second opening portion  225  is inclined with respect to the Z direction and passes through the second flow-path member  220 . The third opening portion  235  is provided in the third flow-path member  230 . The third opening portion  235  is inclined with respect to the Z direction and passes through the third flow-path member  230 . 
     The first opening portion  215 , the second opening portion  225 , and the third opening portion  235  communicate with one another, in such a manner that one opening portion  201  is formed. The opening portion  201  has an opening shape extending in the Xa direction. Six opening portions  201  are aligned in the Y direction. 
     In this case, The COF substrate  98  according to this embodiment includes a lower end portion  98   c  and an upper end portion  98   d , as illustrated in  FIG. 16 . The lower end portion  98   c  is one end portion of the COF substrate  98 , which is close, in the Z direction, to the head main body  110 . The upper end portion  98   d  is the other end portion of the COF substrate  98 , which is far away, in the Z direction, from the head main body  110 . The width of the upper end portion  98   d  in the Xa direction is greater than the width of the lower end portion  98   c  in the Xa direction. 
     In this embodiment, a part of the COF substrate  98 , which is inserted through the first opening portion  215 , and a part of the COF substrate  98 , which is inserted through the third opening portion  235 , have a rectangular shape of which the Xa-direction width is constant. A part of the COF substrate  98 , which is inserted through the second opening portion  225 , has a trapezoidal shape of which the Xa-direction width is reduced as part of the COF substrate  98  extends from the Z 1  side to the Z 2  side. 
     Meanwhile, the opening portion  201  of the flow-path member  200  has a first opening  236  (in other words, the Z 1 -side opening of the third opening portion  235 ) and a second opening  216  (in other words, the Z 2 -side opening of the first opening portion  215 ). In the Z direction perpendicular to the liquid ejection surface  20   a , the first opening  236  is close to the head main body  110  and the second opening  216  is far away from the head main body  110 . 
     The size of the second opening  216  in the Xa direction is smaller than the size of the first opening  236  in the Xa direction. In other words, the width of the opening portion  201  in the Xa direction is reduced as the opening portion  201  extends from the Z 1  side to the Z 2  side in the Z direction. Specifically, the opening portion  201  has a shape allowing the COF substrate  98  to be accommodated therein. The width of the opening portion  201  in the Xa direction is slightly greater than the width of the COF substrate  98  in the Xa direction. 
     The inclination of the COF substrate  98  inserted through the opening portion  201  of the flow-path member  200  will be described with reference to  FIGS. 17A and 17B .  FIG. 17A  is a cross-sectional view of  FIGS. 10 to 13 , taken along line XVIIA-XVIIA. In other words,  FIG. 17A  is a schematic side view in which one head main body of the recording head according to this embodiment is seen from the Xa 2  side to the Xa 1  side in the Xa direction.  FIG. 17B  is a schematic side view in which a head main body according to a comparative example is seen from the Xa 2  side to the Xa 1  side in the Xa direction. 
     The first opening portion  215 , the second opening portion  225 , and the third opening portion  235  communicate with one another, in such a manner that one opening portion  201  is provided in the flow-path member  200 , as illustrated in  FIG. 17A . In this case, a plane of the COF substrate  98  which passes through both the first opening  236  of the opening portion  201  of the flow-path member  200 , which is the opening on the head main body  110  side, and the second opening  216  of the opening portion  201 , which is the opening on the side opposite to the head main body  110  side, is set to a plane B (which is illustrated, in  FIG. 17A , by a straight line). A plane which intersects, in the first opening  236 , the plane B, is parallel to the Xa direction, and is perpendicular to the liquid ejection surface  20   a  is set to a plane A (which is illustrated, in  FIGS. 17A and 17B , by a straight line). In this case, the plane B of the COF substrate  98  intersects the plane A perpendicular to the liquid ejection surface  20   a.    
     Specifically, the second opening  216  and the first opening  236  are disposed at different positions in the Ya direction. In this embodiment, respective second openings  216  of the six opening portions  201  and the first openings  236  corresponding thereto are staggered, by a predetermined distance, to the Ya 2  side in the Ya direction. In other words, the opening portion  201  is inclined in a state where the second opening  216  side of the plane B is far away from the plane A, from the Ya 1  side to the Ya 2  side in the Ya direction. 
     The COF substrate  98  extends from the connection port  43  (see  FIG. 8 ) on the head main body  110  side to the flow-path member  200 . In the flow-path member  200  in a portion between the head main body  110  and the relay substrate  140  (see  FIG. 2 ), the COF substrate  98  is inclined in a direction directed toward one surface side of the COF substrate  98 . Here, the one surface of the COF substrate  98  is referred to as a first surface  98   a  and the other surface is referred to as a second surface  98   b . In this case, the first surface  98   a  of the COF substrate  98  is a surface on a side in which the surface does not face the plane A, in other words, a surface on the Ya 2  side in the Ya direction. The second surface  98   b  of the COF substrate  98  is a surface on a side in which the surface faces the plane A, in other words, a surface on the Ya 1  side in the Ya direction. 
     The meaning of “in the flow-path member  200  in the portion between the head main body  110  and the relay substrate  140 , the COF substrate  98  is inclined in a direction directed to the first surface  98   a  side”, implies that a part of the COF substrate  98  which is a portion from the head main body  110  to the second opening  216  as an outlet port of the opening portion  201  of the flow-path member  200  is inclined in the direction toward the first surface  98   a  side. Accordingly, a part of the COF substrate  98 , which is a portion protruding from the second opening  216  and is connected to the surface of the relay substrate  140  can be inclined in any direction. 
     The opening portion  201  has a Ya-direction width in which a gap between the opening portion  201  and a part of the inclined COF substrate  98 , which is a portion closest to the opening portion  201 , is approximately constant in a portion between the Ya 1  side and the Ya 2  side. Specifically, the first opening portion  215  has a Ya-direction width in which a gap between the inclined COF substrate  98  and the first flow-path member  210  is approximately constant. The second opening portion  225  has a Ya-direction width in which a gap between the inclined COF substrate  98  and the second flow-path member  220  is approximately constant. In addition, the third opening portion  235  has a Ya-direction width in which a gap between the inclined COF substrate  98  and the third flow-path member  230  is approximately constant. For ease of processing of the flow-path member  200 , the first opening portion  215 , the second opening portion  225 , and the third opening portion  235  have an opening shape passing through the flow-path members in the Z direction. When viewed from the Xa direction, the opening portion  201  has a step shape, as illustrated in  FIG. 17A . Needless to say, the opening portion  201  may be inclined in accordance with the inclination of the COF substrate  98 . The COF substrate  98  is inserted through such an opening portion  201 , and thus the COF substrate  98  inserted through the opening portion  201  is inclined in the direction toward the first surface  98   a  side (in other words, the Ya 2  side), with respect to the plane A. 
     In the Z 2 -side surface of the head main body  110 , the introduction paths  44  are formed around the connection port  43 , as illustrated in  FIG. 8 . The introduction paths  44  are arranged in a state where a gap between the connection port  43  and the introduction path  44  which is located on the Ya 1  side, in relation to the connection port  43  of the COF substrate  98 , and a gap between the connection port  43  and the introduction path  44  which is located on the Ya 2  side are substantially the same. The COF substrate  98  is disposed in a state where a part of the COF substrate  98 , which is a portion connected to the lead electrodes  90  extending to both sides of the COF substrate  98  in the Ya direction, is located at a substantially central position of the connection port  43  so as to ease the electrical connection between the COF substrate  98  and the lead electrodes  90  extending to both sides of the COF substrate  98  in the Ya direction. In other words, the COF substrate  98  is disposed, in the Ya direction, closer to one side (which is the Ya 1  side, in  FIG. 8 ) surface of the connection port  43 . As a result, the COF substrate  98  is disposed, in the Ya direction, closer to one of the introduction paths  44 . However, in the flow-path member  200 , either a gap between the COF substrate and the Ya 1  side in the Ya direction or a gap between the COF substrate and the Ya 2  side is set to be approximately constant. As a result, the flow-path member  200  is prevented from coming into contact with the COF substrate  98  and the size of the flow-path member  200  is reduced in the Ya direction. 
     The first flow path  241  in the flow-path member  200  is connected to the head main body  110  corresponding thereto, through the first bifurcation flow path  261  on the first surface  98   a  side of the COF substrate  98  inclined as described above. The second flow path  242  is connected to the head main body  110  corresponding thereto, through the second bifurcation flow path  262  on the second surface  98   b  side. 
     This will be described with reference to  FIGS. 17A, 17B, and 18 .  FIG. 18  is a schematic plan view of one head main body of the recording head according to this embodiment, in which the head main body is viewed from the Z 2  side to the Z 1  side in the Z direction. 
     In the Z 2 -side surface of the head main body  110 , four introduction paths  44  are formed around the connection port  43 , as illustrated in  FIG. 18  (see  FIG. 7 ). Specifically, two introduction paths  44   a  and  44   b  are open in areas further on the Ya 1  side in the Ya direction than the connection port  43 . The positions of the two introduction paths  44   a  and  44   b  and the position of the connection port  43  overlap in the Xa direction. The introduction path  44   a  is disposed further on the Xa 1  side in the Xa direction than the introduction path  44   b . Two remaining introduction paths  44   c  and  44   d  are open in areas further on the Ya 2  side in the Ya direction than the connection port  43 . The positions of the two introduction paths  44   c  and  44   d  and the position of the connection port  43  overlap in the Xa direction. The introduction path  44   c  is disposed further on the Xa 1  side in the Xa direction than the introduction path  44   d . The connection port  43  and the first opening  236  have substantially the same shape. The connection port  43  and the first opening  236  communicate with each other. 
     An introduction path  44   a  is connected to the second flow path  242   a , in other words, the second introduction flow path  282   a  (see  FIG. 14 ), the second distribution flow path  252   a , the second bifurcation flow path  262   a , the second vertical flow path  272   a , and the second connection portion  292   a.    
     An introduction path  44   b  is connected to the second flow path  242   b , in other words, the second introduction flow path  282   b  (see  FIG. 15 ), the second distribution flow path  252   b , the second bifurcation flow path  262   b , the second vertical flow path  272   b , and the second connection portion  292   b.    
     An introduction path  44   c  is connected to the first flow path  241   a , in other words, the first introduction flow path  281   a  (see  FIG. 14 ), the first distribution flow path  251   a , the first bifurcation flow path  261   a , the first vertical flow path  271   a , and the first connection portion  291   a.    
     An introduction path  44   d  is connected to the first flow path  241   b , in other words, the first introduction flow path  281   b  (see  FIG. 15 ), the first distribution flow path  251   b , the first bifurcation flow path  261   b , the first vertical flow path  271   b , and the first connection portion  291   b.    
     The relationship between the introduction paths  44   a  to  44   d , the first flow path  241 , and the second flow path  242  are the same in the six head main bodies  110 . 
     The first flow path  241  is connected to the head main body  110 , in an area on the first surface  98   a  side of the COF substrate  98 , as described above. In addition, the second flow path  242  is connected to the head main body  110 , in an area on the second surface  98   b  side of the COF substrate  98 . 
     In this case, the COF substrate  98  is inclined in the direction toward the first surface  98   a  side and, further, the opening portion  201  is inclined in the direction toward the first surface  98   a  side (that is, the Y 2  side), as illustrated in  FIG. 17A . When the opening portion  201  is inclined in the direction toward the first surface  98   a  side, as described above, the area of the flow-path member  200 , in which the flow paths  240  can be formed, can be constituted of a wide area and a narrow area. 
     The meaning of “an area of the flow-path member  200 , in which the flow paths  240  can be formed, can be constituted of a wide area and a narrow area” implies that an area T of the flow-path member  200 , which is the area corresponding to the head main body  110 , is divided, in the Ya direction in which the COF substrate  98  is inclined, into the area P and the area Q with the opening portion  201  which is interposed between the area P and the area Q and through which the COF substrate  98  is inserted. In the area T, the area P is an area on the first surface  98   a  side of the COF substrate  98  and the area Q is an area on the second surface  98   b  side of the COF substrate  98 . In the same Z-direction surface, the width of the area Q in the Ya direction is greater than the width of the area P in the Ya direction. 
     In this embodiment, in the area T which forms parts of the first flow-path member  210 , the second flow-path member  220 , and the third flow-path member  230  constituting the flow-path member  200  and which corresponds to the head main body  110 , an area on the first surface  98   a  side in the Ya direction is the area P and an area on the second surface  98   b  side is the area Q. The areas P and Q are hatched in the accompanying drawings. 
     In this embodiment, the COF substrate  98  is inclined, as illustrated in  FIG. 17A . Accordingly, in the Z 1 -side surface of the first flow-path member  210 , which is an example of the same-direction surface, the area Q is increased by a Ya-direction width U 1  and the Ya-direction width of the area P is reduced by the width U 1 . Similarly, in the Z 2 -side surface of the second flow-path member  220 , which is an example of a same-direction surface, the area Q is increased by a Ya-direction width U 2  and the Ya-direction width of the area P is reduced by the width U 2 . 
     The Ya-direction width of the area Q is increased as the area Q extends from the Z 1  side to the Z 2  side in the Z direction. In this embodiment, the first flow-path member  210  has a relatively large width difference between the area P and the area Q, compared to in the case of the second flow-path member  220 . Similarly, the second flow-path member  220  has a relatively large width difference between the area P and the area Q, compared to in the case of the third flow-path member  230 . In other words, a width difference between the area P and the area Q is increased in the flow-path member  200 , as the flow-path member  200  extends from the head main body  110  to the relay substrate  140 . 
     The second bifurcation flow path  262  which is disposed in a plane parallel to the liquid ejection surface  20   a  is disposed in the area Q having a large width. The meaning of “the area Q having a large width has a portion in which the second flow path  242  is provided in a state where the second flow path  242  extends along the liquid ejection surface  20   a ” implies that at least a part of a flow path constituting the second flow path  242  is provided, in the area Q, in the plane parallel to the liquid ejection surface  20   a  and the part of the flow path is connected to the introduction path  44  of the head main body  110 . 
     In this embodiment, the second bifurcation flow path  262   a  of the second flow path  242   a  is provided in the area Q. In addition, the second bifurcation flow path  262   b  of the second flow path  242   b  is provided in the area Q. 
     In the recording head  100  according to this embodiment, the COF substrate  98  is inclined in the direction toward the first surface  98   a  side. Accordingly, the opening portion  201  of the flow-path member  200  can be provided close to the first surface  98   a  side, and thus the area in which the flow paths  240  of the flow-path member  200  can be formed can be constituted of a wide area and a narrow area. As a result, the second bifurcation flow path  262  constituting the second flow path  242  can be disposed in the area Q which is wider than the area P. In other words, since the second bifurcation flow path  262  can be disposed in the area Q having a relatively large width, it is easy to provide an optimal configuration of the second flow path  242  in relation to, for example, the arrangement of the head main body  110 . In other words, larger the width of area Q is, higher the degrees of freedom in the arrangement of the second flow path  242  is. The degree of freedom in the arrangement of the second flow path  242  is proportional to the Ya-direction width of the area Q and means that higher the degree of freedom is, the easier the second flow path  242  can be provided in the area Q. 
     In the recording head  100  according to this embodiment, the COF substrate  98  is inclined, and thus the area Q of which the width in the Ya direction is increased can be formed. The Ya-direction width of the area Q is increased, and thus the second bifurcation flow path  262  constituting a part of the second flow path  242  can be provided in a state where the second bifurcation flow path  262  is prevented from interfering, in the Ya direction, with the COF substrate  98 . 
     Therefore, a gap between the second bifurcation flow path  262  and the plane A can be reduced in the Ya direction of the second flow-path member  220 , compared to the comparative example described below. Accordingly, the size of the second flow-path member  220 , in other words, the size of the flow-path member  200 , can be reduced in the Ya direction. As a result, the Ya-direction width of the recording head  100  can be reduced. 
     Furthermore, the COF substrate  98  of this embodiment is disposed close to the Ya 1 -side side surface of the connection port  43 , as described above. As a result, the COF substrate  98  is disposed close to the introduction path  44  in the area on the Ya 1  side of the connection port  43 . A constant gap is maintained between the COF substrate  98  and the bifurcation flow path  260  which is connected to the introduction path  44  via the vertical flow path  270 . Thus, the degree of freedom in the arrangement of the bifurcation flow path  260  in an area on the Ya 1  side of the COF substrate  98  is reduced. However, the COF substrate  98  is inclined in a direction directed to the Ya 2  side opposite to the Ya 1  side, and thus, even in such a case, the degree of freedom in the arrangement of the bifurcation flow path  260  in the area on the Ya 1  side of the COF substrate  98  is increased. As a result, the size of the flow-path member  200  can be reduced in the Ya direction. 
     In a recording head in which the COF substrate  98  is not inclined, a reduction in size of the flow-path member  200  cannot be achieved. This will be described with reference to  FIGS. 17A and 17B . 
     A gap between the second opening portion  225  and the second bifurcation flow path  262   a  illustrated in  FIG. 17A  is set to V. A schematic side view of a recording head according to the comparative example is illustrated in  FIG. 17B . A recording head  100 ′ according to the comparative example and the recording head  100  have the same configuration, except for in the inclination of the COF substrate  98 , the arrangement of the opening portions  201  along the COF substrate  98 , and the size of the area T corresponding to the head main body  110 . 
     In the recording head  100 ′, when a gap V of which the size is the same as in the case of the recording head  100  is maintained between the opening portion  201  and a second bifurcation flow path  262   a ′ which is provided in a plane parallel to the liquid ejection surface  20   a , such that the COF substrate  98  is prevented from interfering, in the Ya direction, with the second bifurcation flow path  262   a ′, it is necessary to move the second bifurcation flow path  262   a ′ to the Ya 1  side in the Ya direction, by extended the width U in the recording head  100 . Accordingly, in the recording head  100 ′ according to the comparative example, a gap between the second bifurcation flow path  262   a ′ and the plane A is increased in the Ya direction of the flow-path member  200 , and thus the size of the flow-path member  200  cannot be reduced in the Ya direction. In other words, the COF substrate  98  is inclined in the direction toward to the first surface  98   a  side, and the second vertical flow path  272   a  can be located close to the COF substrate  98  side, with the width U 1  or the width U 2 , as illustrated in  FIG. 17A . In other words, the size of the flow-path member  200  can be reduced in the Ya direction. 
     In the recording head  100  according to this embodiment, the first distribution flow path  251   a  of the first flow path  241  and the second distribution flow path  252   a  of the second flow path  242  are located at different positions in the Z direction perpendicular to the liquid ejection surface  20   a , and thus both paths overlap in the Z direction. In addition, the first distribution flow path  251   b  of the first flow path  241  and the second distribution flow path  252   b  of the second flow path  242  are located at different positions in the Z direction, and thus both paths overlap in the Z direction. Accordingly, the size of the recording head  100  can be reduced in a plane direction of the liquid ejection surface  20   a , compared to in the case where all of a plurality of distribution flow paths are arranged in the same plane. 
     Furthermore, in the recording head  100  according to this embodiment, the second bifurcation flow path  262  and the head main body  110  are connected through the second vertical flow path  272  extending in a direction perpendicular to the liquid ejection surface  20   a . Accordingly, in a plan view seen in the Z direction perpendicular to the liquid ejection surface  20   a , the area of the second vertical flow path  272  is smaller than an inclined flow path used in the case where the second bifurcation flow path  262  and the head main body  110  are connected through the inclined flow path which is inclined with respect to the direction perpendicular to the liquid ejection surface  20   a . In other words, when the second distribution flow path  252  and the head main body  110  are connected through the second vertical flow path  272 , as in the case of this embodiment, the size of the flow-path member  200  when viewed from the top can be reduced. Similarly, The first bifurcation flow path  261  and the head main body  110  are connected through the first vertical flow path  271  extending in the direction perpendicular to the liquid ejection surface  20   a , and thus the size of the flow-path member  200  when viewed from the top can be reduced. 
     The Ya-direction width of the vertical flow path  270  may be smaller than the Ya-direction width of the bifurcation flow path  260 . In this case, it is possible to further improve the degree of freedom in the arrangement of the vertical flow path  270  and the bifurcation flow path  260  while maintaining the gap V with respect to the opening portion  201 , compared to in the case where the Ya-direction width of the vertical flow path  270  is not smaller than the Ya-direction width of the bifurcation flow path  260 . In addition, the cross-sectional area of the vertical flow path  270  may be smaller than that of the bifurcation flow path  260 . In this case, it is possible to increase the flow velocity of ink in the vertical flow path  270 , and thus air bubbles in the vertical flow path  270  can be effectively discharged. 
     Here, it is assumed that the second flow path  242  is formed in the area P. In this case, the Ya-direction width of the area Q of the flow-path member  200  is increased and the Ya-direction of the area P is reduced, as the flow-path member  200  extends, in the Z direction, away from the head main body  110 . Particularly, when it is assumed that the COF substrate  98  is disposed close to the Ya 2 -side side surface of the connection port  43 , the Ya-direction width of the area P is further reduced to maintain a constant Ya-direction width relating to the COF substrate  98 . Accordingly, when a side (for example, the Ya 2  side) in which the COF substrate  98  is close, in the Ya direction, to the side surface of the connection port  43  and a side (similarly, the Ya 2  side) in which the COF substrate  98  is inclined in the Ya direction are the same, the degree of freedom in the arrangement of the second flow path  242  in the area P is reduced. As a result, it is extremely difficult to arrange the second flow path  242 . However, in this embodiment, the second bifurcation flow path  262  is formed in the area Q, and thus the degree of freedom in the arrangement of the second bifurcation flow path  262  is increased. As a result, the size of the flow-path member  200  can be reduced in the Ya direction. Furthermore, a side (for example, the Ya 1  side) in which the COF substrate  98  is close, in the Ya direction, to the side surface of the connection port  43  and a side (similarly, the Ya 2  side) in which the COF substrate  98  is inclined in the Ya direction are not the same. Thus, the degree of freedom in the arrangement of the bifurcation flow path  260  on the side in which the COF substrate  98  is close, in the Ya direction, to that in the side surface of the connection port  43 . As a result, the size of the flow-path member  200  can be reduced in the Ya direction. 
     Meanwhile, it is assumed that the first flow path  241  is formed in the area Q. In this case, although the Ya-direction width of the area Q of the flow-path member  200  is increased as the flow-path member  200  extends, in the Z direction, away from the head main body  110 , the first flow path  241  is formed in an area on a side close to the head main body  110 . Thus, it is not possible to take full advantage of the area Q of which the width is increased in the Ya direction. Particularly, in a case where it is assumed that, in order to reduce the size in the plane direction of the liquid ejection surface  20   a , the first distribution flow path  251   a  and the second distribution flow path  252   a  are located at different positions in the Z direction such that both paths overlap in the Z direction and the first distribution flow path  251   b  and the second distribution flow path  252   b  are located at different positions in the Z direction such that both paths overlap in the Z direction, as in the case of this embodiment, when both the first bifurcation flow path  261  and the second bifurcation flow path  262  are formed in the area Q, the degree of freedom in the arrangement of the flow paths is not relatively high, compared to in the case where the second bifurcation flow path  262  is formed in the area Q and the first bifurcation flow path  261  is formed in the area P. However, in this embodiment, the first bifurcation flow path  261  is formed in the area P, and thus the degree of freedom in the arrangement of the first bifurcation flow path  261  is increased. As a result, the size of the flow-path member  200  can be reduced in the Ya direction. Furthermore, in the first distribution flow path  251  and the second distribution flow path  252  which overlap in the Z direction, the first bifurcation flow path  261  of the first distribution flow path  251  and the second bifurcation flow path  262  of the second distribution flow path  252  do not overlap in the Z direction. As a result, the degrees of freedom in the arrangement of the first bifurcation flow path  261  and the second bifurcation flow path  262  is increased, and thus the size of the flow-path member  200  can be reduced in the Ya direction. 
     Furthermore, in the COF substrate  98  according to this embodiment, the width of the upper end portion  98   d  in a plane direction (in other words, the Xa direction) is smaller than that of the lower end portion  98   c  (see  FIG. 16 ), as described above. The opening portion  201  is formed matched to the COF substrate  98 . Accordingly, the width of the upper end portion  98   d  of the COF substrate  98  is reduced in the plane direction, and thus areas W corresponding to the reduced width are provided, in the flow-path member  200 , in both areas outside the second opening  216  in the plane direction. The second flow path  242  can be formed in the area W. 
     In this embodiment, the second distribution flow path  252  and the second bifurcation flow path  262  of the second flow path  242  are formed in both the first flow-path member  210  and the second flow-path member  220 . Accordingly, in the first flow-path member  210  and the second flow-path member  220 , areas outside the first opening portions  215  and  225  in the Xa direction are the areas W (see  FIG. 16 ). Furthermore, in this embodiment, the first distribution flow path  251  and the second distribution flow path  252  overlap in the Z direction (see  FIGS. 14 and 15 ). In this case, the first distribution flow path  251  and the second distribution flow path  252  may be arranged in a state where, when the first distribution flow path  251  and the second distribution flow path  252  are projected, in the Z direction, onto the liquid ejection surface  20   a , the projection images do not completely overlap or partially overlap. Alternatively, at least a part of the projection image of the second distribution flow path  252  may be located, in the X direction, further inside the projection image of the first distribution flow path  251 , compared to the projection image of the first distribution flow path  251 . In other words, the second distribution flow path  252   a  may be formed passing through the areas W. Furthermore, not only the second distribution flow path  252   a  but also the second distribution flow path  252   b  and the second bifurcation flow path  262  may be formed passing through the areas W. In this case, even when the second distribution flow path  252  and the second bifurcation flow path  262  are arranged at positions at which, when viewed from the Z direction, both flow paths interfere with the lower end portion  98   c  as one end portion of the COF substrate  98 , the second distribution flow path  252  and the second bifurcation flow path  262  can be prevented from interfering with the COF substrate  98 , due to the Z-direction positions of both flow paths. 
     In the recording head  100  according to this embodiment, the width of the upper end portion  98   d  of the COF substrate  98  is smaller than that of the lower end portion  98   c  and the opening portion  201  is formed matched with the COF substrate  98 , as described above. Thus, the area W in which the second flow path  242  is formed can be provided, in the Xa direction, outside the COF substrate  98 . The second flow path  242   b  has a similar configuration. As a result, the degree of freedom in the arrangement of the second flow path  242  is further improved in the flow-path member  200 . 
     Furthermore, the COF substrate  98  having the driving circuit  97  mounted thereon is inserted through the opening portion  201  of the flow-path member  200 , as illustrated in  FIG. 17A . In this embodiment, the driving circuit  97  is provided on the first surface  98   a  side of the COF substrate  98 . 
     In this case, there is a concern that the driving circuit  97  may come into contact with the inner surface of the opening portion  201 . Accordingly, the Ya-direction width of the opening portion  201  is increased by the thickness of the driving circuit  97  such that the driving circuit  97  is prevented from coming into contact with the inner surface of the opening portion  201 . The Ya-direction width of the opening portion  201  is increased, in such a manner that it is possible to effectively prevent the driving circuit  97  from coming into contact with the inner wall of the opening portion  201 . In this case, the driving circuit  97  is disposed at a position at which the driving circuit  97  is accommodated, in the Z direction, in both the second opening portion  225  of the second flow-path member  220  and the third opening portion  235  of the third flow-path member  230 . That is, the driving circuit  97  is not disposed at a position at which the driving circuit  97  is accommodated, in the Z direction, in the first opening portion  215  of the first flow-path member  210 . Accordingly, in the Ya direction, the width of the first opening portion  215  can be smaller than that of the second opening portion  225  or the third opening portion  235 . In other words, an area in which the second flow path  242  is formed can be provided, in the Ya direction, outside the COF substrate  98 . As a result, the degree of freedom in the arrangement of the second flow path  242  is further improved in the flow-path member  200 . 
     When it is assumed that the driving circuit  97  is disposed at a position at which the driving circuit  97  is accommodated in the first opening portion  215  of the first flow-path member  210 , the Ya-direction width of the first opening portion  215  cannot be reduced. Thus, the degree of freedom in the arrangement of the second flow path  242  cannot be improved in the flow-path member  200 . 
     Meanwhile, in the recording head  100  according to this embodiment, the driving circuit  97  is disposed at the position at which the driving circuit  97  is accommodated, in the Z direction, in both the second opening portion  225  and the third opening portion  235  and the Ya-direction width of the first opening portion  215  is reduced. As a result, the degree of freedom in the arrangement of the second flow path  242 , such as the second distribution flow path  252  and the second bifurcation flow path  262 , is improved in the flow-path member  200 . 
     Next, the first flow path  241  which is connected, in the area P having a narrow width, to the head main body  110  will be described. The first bifurcation flow path  261  provided in a plane parallel to the liquid ejection surface  20   a  is disposed in the area P having a narrow width. The meaning of “the first flow path  241  is connected, in the area P having a narrow width, to the head main body  110 ” implies that at least a part of the flow path constituting the first flow path  241  is formed in the area P described above and the part of the flow path is connected to the introduction path  44  of the head main body  110 . 
     The Ya-direction width of the area P having a narrow width is reduced. Thus, in some cases, the area P cannot have a width adequate for providing the first bifurcation flow path  261 . However, in this embodiment, the first flow path  241  is disposed, in the Z direction, closer to the head main body  110  side than the second flow path. 
     Accordingly, even when the Ya-direction width of the area P is reduced due to the inclination of the COF substrate  98 , the first flow path  241  is not affected and can be connected to the head main body  110 . 
     In the recording head  100  having the plurality of head main bodies  110 , the first distribution flow path  251  and the second distribution flow path  252  are disposed at different positions in the Z direction, as described in Embodiment 1. Accordingly, the size of the flow-path member  200  in the in-plane direction parallel to the liquid ejection surface  20   a  can be reduced, compared to in the case where the first distribution flow path  251  and the second distribution flow path  252  are arranged in the same plane. 
     Furthermore, in one head main body  110 , a plurality of manifolds  95  are arranged in the same plane. Thus, the positions of respective manifolds  95  can be aligned in the Z direction perpendicular to the liquid ejection surface  20   a , with respect to the liquid ejection surface  20   a . Accordingly, in different manifolds, the lengths of the flow paths (which are the supply communication paths  19 , the pressure generation chambers  12 , and the nozzle communication paths  16 ) extending from respective manifolds  95  to the nozzle openings  21  set to be values which are as similar as possible to each other. As a result, variation in flow-path resistance can be reduced. In other words, variation in pressure of ink in the flow path  240  can be reduced, and thus it is easy to manage a back-pressure control. In addition, variation in the weight of ink droplets ejected from the nozzle opening  21  can be reduced. Ink ejection properties can be stabilized in the recording head  100 , as described above. 
     Furthermore, the first distribution flow path  251   a  and the second distribution flow path  252   a  are formed in the flow-path member  200 , in a state where, when viewed from the Z 2  side to the Z 1  side in the Z direction, at least parts of the first distribution flow path  251   a  and the second distribution flow path  252   a  overlap. The first distribution flow path  251   a  and the second distribution flow path  252   a  overlap in the Z direction, as described above, and the size of the first distribution flow path  251   a  in the in-plane (which is an XY plane) direction of the liquid ejection surface  20   a  and the size of the second distribution flow path  252   a  in the same direction can be reduced, compared to in the case where the distribution flow paths do not overlap. The first distribution flow path  251   b  and the second distribution flow path  252   b  have a similar configuration. As a result, the size of the recording head  100  in the in-plane direction of the liquid ejection surface  20   a  can be reduced. 
     Furthermore, the first distribution flow path  251  and the second distribution flow path  252  are formed by three members which are the first flow-path member  210 , the second flow-path member  220 , and the third flow-path member  230 . As described above, the first distribution flow path  251  and the second distribution flow path  252  located at different positions in the Z direction can be formed by at least the three members. As a result, the number of parts can be reduced. Needless to say, four or more members may be used for forming the first distribution flow path  251  and the second distribution flow path  252 . 
     Furthermore, in a plan view seen in the Z direction perpendicular to the liquid ejection surface  20   a , the size of the second vertical flow path  272  in the second flow-path member  220  is smaller than that of the inclined flow path connecting the second distribution flow path  252  and the head main body  110 . In other words, the second distribution flow path  252  and the head main body  110  are connected through the second vertical flow path  272 , and thus the size of the second flow-path member (in other words, the flow-path member  200 ) when viewed from the top can be reduced. 
     Furthermore the vertical flow path  270  extending in the Z direction perpendicular to the liquid ejection surface  20   a  is used as a flow path connecting the distribution flow path  250  and the manifold  95 . Accordingly, it is possible to easily adjust the Z-direction gap between the distribution flow path  250  and the manifold  95 . Furthermore, liquid is supplied to the manifold  95  through the vertical flow path  270 . In other words, when the manifold  95  and the vertical flow path  270  are orthogonally projected onto the liquid ejection surface  20   a , the projection image of the vertical flow path  270  is smaller than that of the manifold  95 . Liquid is supplied through the vertical flow path  270 , and thus the flow velocity of liquid in the vertical flow path  270  is increased. As a result, air bubbles in the vertical flow path  270  can be effectively discharged. Furthermore, the distribution flow paths  250  and the manifolds  95  are connected through the first vertical flow path  271  and the second vertical flow path  272 . Thus, even when the first distribution flow path  251  and the second distribution flow path  252  are located at different positions in the Z direction, the degree of freedom in the layout of the distribution flow path  250  and the manifold  95  is improved. 
     Furthermore, the bifurcation flow paths  260  which branch off from the distribution flow path  250  and communicate with the connection portions  290  are provided. Thus, it is possible to provide flow paths which communicate with the connection portions  290  through the bifurcation flow paths  260  branching off from the distribution flow path  250 . As a result, flow paths through which ink is supplied to the plurality of head main bodies  110  can be reliably formed in a small space. Furthermore, since the bifurcation flow paths  260  are provided as described above, the positional relationship of the connection portions  290  in a plane, relating to the distribution flow paths  250 , can be set with high degrees of freedom. As a result, the degree of freedom in the layout is improved. 
     In this embodiment, the distribution flow path  250  and the bifurcation flow path  260  can be provided in the same plane, and thus the distribution flow path  250  and the bifurcation flow path  260  can be formed in a common member. Needless to say, the distribution flow path  250  and the bifurcation flow path  260  may not be provided in the same plane and the bifurcation flow path may be inclined with respect to the Z direction. 
     In this embodiment, the first distribution flow path  251  and the second distribution flow path  252  are connected to one common head main body  110  through the first connection portion  291  and the second connection portion  292 . Accordingly, different color inks of which the number (which is four, in this embodiment) is the same as the number of the flow paths  240  can be supplied to one head main body  110 . In this embodiment, different color inks flows in the four flow paths  240 . However, inks of the same color may flow in the four flow paths. Only one of an black ink Bk, a magenta ink M, a cyan ink C and a yellow ink Y may be supplied to one head main body  110  through flow paths  240  of two systems of the four systems. Even in this case, liquids of predetermined kinds can be ejected from the plurality of head main bodies  110 . 
     In this embodiment, the first connection portions  291   a   2  to  291   a   6  and  291   b   2  to  291   b   6  and the second connection portions  292   a   2  to  292   a   6  and  292   b   2  to  292   b   6  of the flow paths  240  of four systems are provided in areas on both sides of the COF substrate  98  in the Ya direction, in which the COF substrate  98  is inserted through the first opening portion  215 , the second opening portion  225 , and the third opening portion  235  is interposed between the connection portions. In this case, the COF substrate  98  can be disposed in a portion between two manifolds  95  aligned in the Ya direction. As a result, it is easy to connect the COF substrate  98  and the lead electrode  90  (in other words, the piezoelectric actuator  300 ). Furthermore, the connection portion  290  is not necessarily connected to the head main body  110  with the COF substrate  98  interposed therebetween. 
     In this embodiment, the first introduction flow path  281  communicating with the first distribution flow path  251  and the second introduction flow path  282  communicating with the second distribution flow path  252  are provided. Furthermore, the boundary portion between the first distribution flow path  251  and the first introduction flow path  281  and the boundary portion between the second distribution flow path  252  and the second introduction flow path  282  are disposed in an inside portion between the plurality of manifolds  95 , in the Y direction in which ink flows in the first distribution flow path  251  and the second distribution flow path  252 . “The Y-direction inside portion between the plurality of manifolds  95 ” means a portion between both Y-direction-end-side manifolds  95  of a plurality of manifolds  95  is provided in the head main body  110 . In this embodiment, the six head main bodies  110  have, in total, twelve manifolds  95 . The boundary portions described above are located further on an inner side in the Y direction than both end manifolds  95  of the twelve manifolds  95 . In the recording head  100  having such a configuration, it is not necessary to arrange the boundary portions outside the manifolds  95 . Accordingly, the Y-direction size of the recording head  100  can be reduced. As a result, when the plurality of the recording heads  100  aligned in the Y direction are fixed to the head fixing substrate  102 , it is possible to reduce the size of a gap between adjacent recording heads  100  in the Y direction. 
     Furthermore, in this embodiment, the first flow-path member  210 , the second flow-path member  220 , and the third flow-path member  230  are disposed in a portion between the relay substrate  140  and the head main body  110 . Accordingly, the flow path  240  can be formed in a portion outside the area in which the COF substrate  98  is disposed. As a result, the size of the first flow-path member  210 , the second flow-path member  220 , and the third flow-path member  230  can be reduced. However, the configuration is not limited thereto. 
     In this embodiment, the head main body  110  has the manifold  95  which extends in the Xa direction which is a direction along the end portion of the COF substrate  98  bonded to the head main body  110 . The liquid supplied to the head main body  110  is stored in the manifold  95 . The connection portion  290  is disposed, in the Xa direction, in a portion between the distribution flow path  250  and one of both ends of the manifold  95 , which is the end located far away from the distribution flow path  250  (see  FIG. 18 ). In this case, ink can be supplied, in the Xa direction, by the manifold  95 . Thus, it is not necessary to dispose the connection portion  290  on a side far away from the distribution flow path  250 . As a result, the layout is facilitated. However, the configuration is not limited thereto. 
     In this embodiment, all of the COF substrates  98  overlap when viewed in a direction in which ink flows in the first distribution flow path  251  or the second distribution flow path  252 . The direction is parallel to a direction of an imaginary straight line connecting the start point and the end point of the first distribution flow path  251 . In this embodiment, the direction is parallel to the Y direction. The second distribution flow path  252  has a similar configuration. Since the all of the COF substrates  98  overlap, as described above, the distribution flow path  250  can extend, in the Y direction, in a straight line shape. As a result, it is possible to ensure the minimum width of the distribution flow path  250  in the X direction intersecting the Y direction. In addition, all of the COF substrates  98  do not necessarily overlap. 
     Furthermore, in this embodiment, the first distribution flow path  251  is disposed further on the head main body  110  side in the Z direction perpendicular to the liquid ejection surface  20   a  than the second distribution flow path  252 . In the head main body  110 , a nozzle row constituted of the nozzle openings  21  which is aligned in the Xa direction as one direction and through which ink is ejected is provided in the liquid ejection surface  20   a . The Xa direction in which the nozzle rows are aligned intersects the Xa direction which is the transporting direction of the recording sheet S onto which ink is ejected from the head main body  110 . The first distribution flow path  251  includes the first distribution flow path  251   a  and the first distribution flow path  251   b . The first distribution flow path  251   a  (in other words, a first upstream distribution flow path) and the first distribution flow path  251   b  (in other words, a first downstream distribution flow path) are disposed on both sides of the head main body  110  in the X direction. The second distribution flow path  252  includes the second distribution flow path  252   a  and the second distribution flow path  252   b . The second distribution flow path  252   a  (in other words, a second upstream distribution flow path) and the second distribution flow path  252   b  (in other words, a second downstream distribution flow path) are disposed on both sides of the head main body  110  in the X direction. 
     The positions of the first distribution flow path  251   a , the first distribution flow path  251   b , the second distribution flow path  252   a , and the second distribution flow path  252   b  with respect to the COF substrate  98 , which are illustrated in  FIG. 18 , are shared in common by all of the head main bodies  110 . 
     According to such a recording head  100 , the head main bodies  110  are aligned in the Y direction, in a state where the arrangement of the head main bodies  110  satisfies the positional relationship described above, in such a manner that, even when a specific nozzle row of the head main body is not extended, a line in the Y direction can be formed, without a gap in the line. 
     Embodiment 2 
     In the recording head  100  according to Embodiment 1, the head main bodies  110  are aligned to be in one row in the Y direction perpendicular to the X direction as the transporting direction. However, the configuration is not limited thereto.  FIG. 20  is a schematic plan view of a recording head  100 B according to Embodiment 2. The same reference numerals and letters are given to components of which the configurations are the same as those in Embodiment 1. The descriptions thereof will not be repeated. 
     In the recording head  100 B, the head main bodies  110  are arranged, in a staggered manner, in the Y direction perpendicular to the X direction. A plurality of manifolds  95  of respective head main bodies  110  are arranged in the same plane. The first distribution flow path  251  and the second distribution flow path  252  are not arranged in the same plane. 
     Even when the head main bodies  110  of the recording head  100 B are arranged in a staggered manner, the same effects as those in Embodiment 1 can be obtained. 
     Embodiment 3 
       FIG. 21  is a schematic plan view of a recording head  100 C according to Embodiment 3. The same reference numerals and letters are given to components of which the configurations are the same as those in Embodiment 1. The descriptions thereof will not be repeated. 
     The recording head  100 C includes the first introduction flow path  281  communicating with the first distribution flow path  251  and the second introduction flow path  282  communicating with the second distribution flow path  252 , as illustrated in  FIG. 21 . Furthermore, the boundary portion between the first distribution flow path  251  and the first introduction flow path  281  and the boundary portion between the second distribution flow path  252  and the second introduction flow path  282  are disposed in an inside portion between the plurality of manifolds  95 , in the X direction in which ink flows in the first distribution flow path  251  and the second distribution flow path  252 . “The X-direction inside portion between the plurality of manifolds  95 ” means a portion between both X-direction-end-side manifolds  95  of a plurality of manifolds  95  provided in head main body  110 . In  FIG. 21 , the five head main bodies  110  have, in total, ten manifolds  95 . The boundary portion described above are located further on an inner side in the X direction than both end manifolds  95  of the ten manifolds  95 . 
     In the recording head  100 C having such a configuration, it is not necessary to arrange the boundary portions outside the manifolds  95 . Accordingly, the X-direction size of the recording head  100 C can be reduced. 
     Furthermore, the first connection portions  291  and the second connection portions  292  are alternately connected to the head main bodies  110  aligned in the X direction in which the first distribution flow path  251  and the second distribution flow path  252  extend. Specifically, in a direction directed from the X 2  side to the X 1  side in the X direction, ink is supplied from the first distribution flow path  251  to the first manifold  95  through the first connection portion  291 . Next, ink is supplied from the second distribution flow path  252  to the subsequent manifold  95  through the second connection portion  292 . The remaining manifolds  95  have a similar configuration described above. 
     Even in the recording head  100 C having such a configuration, a plurality of different inks can be supplied to respective head main bodies  110 . A configuration is not limited to the configuration in which two different color inks are alternately distributed through both the first distribution flow path  251  and the second distribution flow path  252 . Three or more different color inks may be alternately distributed. 
     Embodiment 4 
       FIG. 22  is a schematic plan view of a recording head  100 D according to Embodiment 4. The same reference numerals and letters are given to components of which the configurations are the same as those in Embodiment 1. The descriptions thereof will not be repeated. 
     The recording head  100 D has a plurality of head main bodies  110  having manifolds  95  extending in the Y direction, as illustrated in  FIG. 22 . Specifically, two head rows, each of which is constituted of five head main bodies  110  aligned in the X direction, are aligned in the Y direction. The first distribution flow path  251  and the second distribution flow path  252  extend, in the X direction, in a portion between the two head rows. 
     In other words, in the recording head  100 D, the Y direction in which ink flows in the manifold  95  is perpendicular to the X direction in which ink flows in the first distribution flow path  251  and the second distribution flow path  252 . 
     According to the recording head  100 D having such a configuration, ink can be effectively supplied over the entirety of a flow-path member  200 D when the flow-path member  200 D is viewed from the top, compared to in a case where the direction in which ink flows in the manifold  95  is parallel to the direction in which ink flows in the first distribution flow path  251  and the second distribution flow path  252 . Furthermore, the size of the distribution flow path  250  can be reduced. 
     The direction in which ink flows in the distribution flow path  250  is parallel to a direction of an imaginary straight line connecting the start point and the end point of the distribution flow path  250 . 
     Furthermore, the direction in which ink flows in the manifold  95  is parallel to the direction in which the pressure generation chambers  12  of the head main bodies  110  are aligned. 
     A configuration is not limited to the configuration in which the direction in which ink flows in the manifold  95  is perpendicular to the direction in which ink flows in the first distribution flow path  251  and the second distribution flow path  252 . Any configuration may be applied as long as the two directions intersect each other. 
     Embodiment 5 
       FIG. 23  is a schematic plan view of a recording head  100 E according to Embodiment 5. The same reference numerals and letters are given to components of which the configurations are the same as those in Embodiment 1. The descriptions thereof will not be repeated. The head main body  110  is not illustrated in  FIG. 23 . 
     The second distribution flow path  252  extends from the second introduction flow path  282  to the X 1  side in the X direction, as illustrated in  FIG. 23 . The middle portion of the second distribution flow path  252  is bent such that the second introduction flow path  282  does not meet the first introduction flow path  281 . In other words, in the recording head  100 E, the second distribution flow path  252  is formed in a state where the second distribution flow path  252  makes a detour to avoid the first introduction flow path  281 . Since the second distribution flow path  252  is formed in a state where the second distribution flow path  252  makes a detour to avoid the first introduction flow path  281 , as described above, the degrees of freedom in the arrangement of the first introduction flow path  281  is improved. 
     Other Embodiments 
     Hereinbefore, the embodiments of the invention are described. However, the basic configuration of the invention is not limited thereto. 
     When the nozzle rows a and b of each head main body  110  of the recording head  100  of Embodiment 1 extend in the Xa direction and the Xa direction are inclined with respect to the X direction as the transporting direction, the X direction and the Xa direction may intersect at an angle greater than 0° and less than 90°. However, the invention also includes the recording head  100  having a configuration in which the X direction and the Xa direction do not intersect. In other words, in a recording head, the head main body  110  may have a configuration in which the Xa direction as a direction of the nozzle row is perpendicular to the X direction as the transporting direction. In this case, the Xa direction is parallel to the Y direction and the Ya direction is parallel to the X direction. Accordingly, in the recording head  100  of Embodiment 1, the size in the Ya direction is reduced. However, in the recording head  100  having the configuration in which the Ya direction is parallel to the X direction, the size thereof can be reduced in the X direction, in other words, the transporting direction of the recording sheet S, which is parallel to the Ya direction. 
     In the recording head  100  according to Embodiment 1, the COF substrate  98  is inclined with respect to the Z direction. However the configuration is not limited thereto. In other words, the COF substrate  98  may be arranged parallel to the Z direction. 
     In the recording head  100  according to Embodiment 1, the first flow path  241  and the second flow path  242  are provided and the first distribution flow path  251  and the second distribution flow path  252  are located at different positions in the Z direction. However, the configuration is not limited thereto. A recording head may include a flow-path member in which flow paths parallel to the liquid ejection surface  20   a  are provided in, for example, only the same plane. According to the embodiment described above, a recording head may have a configuration in which only second flow path is provided in a flow-path member including the first flow-path member  210  and the second flow-path member  220 . In the case of the recording head in which either the first flow path  241  or the second flow path  242  is not provided, as described above, the Z-direction size of the recording head  100  can be reduced. 
     In the recording head  100  according to Embodiment 1, the introduction paths  44   c ,  44   d ,  44   a , and  44   b  are respectively connected to the first flow path  241   a , the first flow path  241   b , the second flow path  242   a , and the second flow path  242   b . However, the configuration is not limited thereto. The introduction paths  44   c  and  44   b  may be respectively connected to the first flow path  241   a  and the first flow path  241   b  and the introduction paths  44   a  and  44   d  may be connected to the second flow paths  242   a  and  242   b . In this case, the recording head may a configuration in which only a second flow path is provided and a first flow path is not provided, as described above. Therefore, the optimal flow paths corresponding to, for example, the arrangement of the head main bodies  110  can be provided. 
     The second flow path  242  is formed by causing the first flow-path member  210  and the second flow-path member  220  to adhere to each other and the first flow path  241  is formed by causing the second flow-path member  220  and the third flow-path member  230  to adhere to each other. However, the method of forming the first flow path  241  and the second flow path  242  is not limited thereto. The first flow path  241  and the second flow path  242  may be integrally formed, without causing two or more flow-path member to adhere to each other, by a lamination forming method allowing three-dimensional forming. Alternatively, each flow-path member may be formed by three-dimensional forming, molding (for example, injection molding), cutting, pressing. 
     The flow-path member  200  has, as the first flow path  241 , two flow paths which are the first flow path  241   a  and the first flow path  241   b . However, the number of first flow paths is not limited thereto. One first flow path may be provided or three or more first flow paths may be provided. The second flow path  242  has a similar configuration described above. 
     The first distribution flow path  251   a  branches into the six first bifurcation flow paths  261   a . However, the configuration is not limited thereto. The first distribution flow path  251   a  may be connected to one head main body  110 , without being branched off. The number of branched-out flow paths is not limited to six and may be two or more. The first distribution flow path  251   b , the second distribution flow path  252   a , and the second distribution flow path  252   b  have a similar configuration described above. The number of the COF substrates  98  inclined in the direction directed to the first surface  98   a  side is not limited to six. Only some of the COF substrates  98  may be inclined. 
     The first distribution flow path  251   a  is a flow path through which ink horizontally flows in a portion between the second flow-path member  220  and the third flow-path member  230 . However, the configuration is not limited thereto. In other words, the first distribution flow path  251   a  may be a flow path inclined with respect to a Z plane. The first distribution flow path  251   b , the second distribution flow path  252   a , and the second distribution flow path  252   b  have a similar configuration. 
     Furthermore, the first vertical flow path  271   a  is perpendicular to the liquid ejection surface  20   a . However, the configuration is not limited thereto. In other words, the first vertical flow path  271   a  may be inclined with respect to the liquid ejection surface  20   a . The first vertical flow path  271   b , the second vertical flow path  272   a , and the second vertical flow path  272   b  have a similar configuration. 
     It is not necessary to set the Xa-direction width of the second opening  216  of the opening portion  201  in the flow-path member  200  to be smaller than that of the first opening  236 . The second opening  216  and the first opening  236  may be openings of which the Xa-direction widths are substantially the same and which allow the rectangular-shaped COF substrate  98  to be accommodated therein. On the contrary, the Xa-direction width of the second opening  216  may be greater than that of the first opening  236 . 
     The COF substrate  98  is provided as a flexible wiring substrate. However, a flexible print substrate (FPC) may be used as the COF substrate  98 . Furthermore, even when the COF substrate  98  is disposed not close to the Ya 1 -side side surface of the connection port  43 , this configuration can be applied as long as the COF substrate  98  and the lead electrode  90  are electrically connected to each other. 
     In Embodiment 1, the holding member  120  and the flow-path member  200  are fixed using, for example, an adhesive. However, the holding member  120  and the flow-path member  200  may be integrally formed. In other words, both the hold portion  121  and the leg portion  122  may be provided on the Z 1  side of the flow-path member  200 . Accordingly, the holding member  120  is not stacked in the Z direction, the Z-direction size of the flow-path member  200  can be reduced. Furthermore, since the hold portion  121  is provided in the flow-path member  200 , the size of the flow-path member  200  in both the X direction and in the Y direction can be reduced because it is necessary for the flow-path member  200  to accommodate only a plurality of head main bodies  110  and it is not necessary for the flow-path member  200  to accommodate the relay substrate  140 . Furthermore, a plurality of members are integrally formed, and thus the number of parts can be reduced. When the flow-path member  200  is constituted of the first flow-path member  210 , the second flow-path member  220 , and the third flow-path member  230 , both the hold portion  121  and the leg portion  122  may be provided on the Z 1  side of the third flow-path member  230 . 
     In Embodiment 1, the head main bodies  110  are aligned in the Y direction and the plurality of head main bodies  110  constitutes the recording head  100 . However, the recording head  100  may be constituted of one head main body  110 . Furthermore, the number of the recording heads  100  provided in the head unit  101  is not limited. Two or more recording heads  100  may be mounted or one single recording head  100  may be mounted in the ink jet type recording apparatus  1 . 
     The ink jet type recording apparatus  1  described above is a so-called line type recording apparatus in which the head unit  101  is fixed and only the recording sheet S is transported, in such a manner that printing is performed. However, the configuration is not limited thereto. The invention can be applied to a so-called serial type recording apparatus in which the head unit  101  and one or a plurality of recording heads  100  are mounted on a carriage, the head unit  101  or the recording head  100  moves in a main scanning direction intersecting the transporting direction of the recording sheet S, and the recording sheet S is transported, in such a manner that printing is performed. 
     The invention is intended to be applied to a general liquid ejecting head unit. The invention can be applied to a liquid ejecting head unit which includes a recording head of, for example, an ink jet type recording head of various types used for an image recording apparatus, such as a printer, a coloring material ejecting head used to manufacture a color filter for a liquid crystal display or the like, an electrode material ejecting head used to form an electrode for an organic EL display, a field emission display (FED) or the like, or a bio-organic material ejecting head used to manufacture a biochip. 
     A wiring substrate of the invention is not intended to be applied to only a liquid ejecting head and can be applied to, for example, a certain electronic circuit.