Patent Publication Number: US-11376851-B2

Title: Liquid ejecting head and liquid ejecting apparatus

Description:
TECHNICAL FIELD 
     The present disclosure relates to a liquid ejecting head such as an ink jet recording head, a liquid ejecting apparatus including the liquid ejecting head, and more particularly, a liquid ejecting head including a compliance portion that suppresses pressure oscillation of a liquid in a liquid flow path, and a liquid ejecting apparatus. 
     BACKGROUND ART 
     The liquid ejecting apparatus is an apparatus provided with a liquid ejecting head and ejects (discharges) various liquids from the liquid ejecting head. As the liquid ejecting apparatus, for example, there are image recording apparatuses such as an ink jet printer and an ink jet plotter, but recently, the liquid ejecting apparatus is also applied to various types of manufacturing apparatus, making use of the feature of being capable of accurately causing an extremely small amount of liquid land accurately on a predetermined position. For example, the liquid ejecting apparatus is applied to a display manufacturing apparatus that manufactures a color filter such as a liquid crystal display, an electrode forming apparatus that forms electrodes of an organic EL (Electro Luminescence) display, an FED (face emitting display), or the like, and a chip manufacturing apparatus that manufactures biochips (biochemical elements). A recording head for the image recording apparatus ejects liquid ink, and a color material ejecting head for the display manufacturing apparatus ejects solutions of each color material of R (Red), G (Green), and B (Blue). An electrode material ejecting head for the electrode forming apparatus ejects a liquid electrode material, and a bioorganic material ejecting head for the chip manufacturing apparatus ejects a bioorganic material solution. 
     As the above liquid ejecting head, there is a liquid ejecting head provided with a nozzle plate having a plurality of nozzles formed therein, a substrate having a plurality of pressure chambers (also referred to as pressure generating chambers) communicating with each nozzle, a substrate in which a common liquid chamber (also referred to as a reservoir or a manifold) shared by each of the pressure chambers into which a liquid is introduced from a liquid storage portion is formed, and a pressure generating means such as a piezoelectric element that generates pressure oscillation in the liquid inside the pressure chamber (for example, refer to PTL 1). A configuration is adopted in which the liquid ejecting head disclosed in PTL 1 is provided with a circulation flow path communicating between each pressure chamber and each nozzle and the liquid circulates between the liquid ejecting head and the liquid storage portion. 
     In the liquid ejecting head of such a configuration, a compliance portion is provided in which a portion of the flow path is provided with a flexible member that deforms in response to pressure changes in the liquid inside the flow path. The compliance portion deforms in response to the pressure oscillation inside the liquid chamber and absorbs the pressure oscillation generated in the liquid inside the liquid chamber. 
     CITATION LIST 
     Patent Literature 
     PTL 1: Japanese Unexamined Patent Application Publication No. 2012-143948 
     SUMMARY OF INVENTION 
     Technical Problem 
     Incidentally, in the above-described configuration in which the liquid circulates, it is desirable to dispose a compliance portion on each of an outward path from a liquid storage portion side toward a pressure chamber side and a return path from the pressure chamber side to the liquid storage portion side. However, there is a problem in that the size of the liquid ejecting head becomes large depending on the disposition layout of these compliance portions, which leads to an increase in the size of the liquid ejecting apparatus. 
     The present disclosure is made in view of these circumstances and an object thereof is to provide a liquid ejecting head capable of suppressing an increase in size in a configuration in which a liquid circulates between the liquid ejecting head and a liquid storage portion, and to provide a liquid ejecting apparatus. 
     Solution to Problem 
     A liquid ejecting head of the present disclosure is proposed in order to achieve the object described above and includes a plurality of pressure chambers communicating with a plurality of nozzles that eject a liquid, a first common flow path through which the liquid is supplied to the plurality of pressure chambers side, a second common flow path through which the liquid is led out from the plurality of pressure chambers side, a first compliance portion that deforms in response to a pressure change in the liquid inside the first common flow path, and a second compliance portion that deforms in response to a pressure change in the liquid inside the second common flow path, in which the first compliance portion and the second compliance portion overlap each other when viewed in a thickness direction of at least one of the compliance portions. 
     According to the liquid ejecting head of the present disclosure, since the first compliance portion and the second compliance portion overlap each other when viewed in the thickness direction of at least one of the compliance portions, even in the configuration in which the compliance portions are provided in each of the first common flow path configuring the outward path toward the pressure chamber side and the second common flow path through which the liquid is led out from the pressure chamber side, it is possible to suppress an increase in the size of the liquid ejecting head. 
     A liquid ejecting head of the present disclosure may include a plurality of pressure chambers communicating with a plurality of nozzles that eject a liquid, a first common flow path through which the liquid is supplied to the plurality of pressure chambers side, a second common flow path through which the liquid is led out from the plurality of pressure chambers side, a first compliance portion that deforms in response to a pressure change in the liquid inside the first common flow path, and a second compliance portion that deforms in response to a pressure change in the liquid inside the second common flow path, in which the first compliance portion and the second compliance portion may overlap each other in a thickness direction of a nozzle plate provided with the nozzles. 
     According to this configuration, since the first compliance portion and the second compliance portion overlap in the thickness direction of the nozzle plate provided with the nozzles, even in the configuration in which the compliance portions are provided in each of the first common flow path configuring the outward path toward the pressure chamber side and the second common flow path through which the liquid is led out from the pressure chamber side, it is possible to suppress an increase in the size of the liquid ejecting head. 
     Since the plurality of pressure chambers, in other words, the first common flow path and the second common flow path shared by the plurality of nozzles are each provided with the compliance portions, as compared to a configuration in which the individual flow paths provided to individually correspond to the plurality of pressure chambers are each provided with the compliance portions, it is possible to more efficiently suppress the pressure oscillation generated in accordance with the liquid ejection operation in each of the pressure chambers. Therefore, even when ink is ejected from each of the nozzles at a higher drive frequency, since it is possible to more reliably suppress the pressure oscillations generated in accordance with the ejection operation, it is possible to handle the liquid ejection at a higher drive frequency. 
     In the above configuration, it is desirable to adopt a configuration in which a compliance of the second compliance portion is larger than a compliance of the first compliance portion. 
     According to this configuration, due to the compliance of the second compliance portion being larger than the compliance of the first compliance portion, for example, even when the pressure oscillation during the driving of the circulation mechanism that circulates the liquid between the liquid storage portion storing the liquid and the liquid ejecting head is superimposed on the pressure oscillation during the ejecting of the liquid from the nozzles, it is possible to reduce the pressure oscillation using the second compliance portion, and fluctuation of the ejection characteristics of the liquid from the nozzles caused by the pressure oscillation, that is, fluctuation of the amount and flight speed of the ejected liquid from target values is suppressed. 
     In the above configuration, it is desirable to adopt a configuration in which, a compliance of one of the first compliance portion and the second compliance portion that is closer to the nozzles is larger than a compliance of the other that is farther from the nozzles. 
     According to this configuration, of the first compliance portion or the second compliance portion, the compliance of the one closer to the nozzles is larger than the compliance of the one farther from the nozzles, so that it is possible to more reliably reduce the pressure oscillation generated by the ejection of the liquid from the nozzles at a position closer to the nozzles. Fluctuation in the ejection characteristics of the liquid from the nozzles, that is, fluctuation in the amount and the flight speed of the ejected liquid from the target values is further suppressed. 
     In the above configuration, it is desirable to adopt a configuration including a plurality of individual outlet flow paths that individually allows communication from the pressure chambers to the second common flow path, in which the second compliance portion does not overlap the plurality of individual outlet flow paths when viewed in a thickness direction of the second compliance portion. 
     According to this configuration, since the second compliance portion does not overlap the individual outlet flow paths when viewed in the thickness direction of the second compliance portion, that is, since the partition walls partitioning the individual outlet flow paths do not interfere with the second compliance portion, when the second compliance portion is deformed, stress being focused on a portion in contact with the partition walls partitioning the individual outlet flow paths and the second compliance portion being damaged originating at the portion, variation in the flow path resistance in each of the individual outlet flow paths, and the like are prevented. 
     In the above configuration, it is desirable to adopt a configuration in which, when an inner dimension of the individual outlet flow paths in a flow path arrangement direction of the plurality of individual outlet flow paths is denoted by W, in a flow path extending direction of the individual outlet flow path, an edge of a displaceable flexible region of the second compliance portion in the second common flow path that is closest to the individual outlet flow path is disposed within W from an exit of the individual outlet flow path on the second common flow path side. 
     According to this configuration, due to the edge of the flexible region of the second compliance portion that is closest to the individual outlet flow paths being disposed within is a distance corresponding to the inner dimension of the individual outlet flow paths from the exits of the individual outlet flow paths on the second common flow path side, the pressure oscillation transmitted through the inner portion of the individual outlet flow paths are alleviated more quickly. Accordingly, variations in the ejection characteristics of each of the nozzles are suppressed more effectively. 
     In the above configuration, it is desirable to adopt a configuration in which a plurality of individual supply flow paths that individually allow communication from the first common flow path to the plurality of pressure chambers, in which the first compliance portion does not overlap the plurality of individual supply flow paths when viewed in a thickness direction of the first compliance portion. 
     According to this configuration, since the first compliance portion does not overlap the individual supply flow paths when viewed in the thickness direction of the first compliance portion, that is, since the partition walls partitioning the individual supply flow paths do not interfere with the first compliance portion, when the first compliance portion is deformed, stress being focused on a portion in contact with the partition walls partitioning the individual supply flow paths and the first compliance portion being damaged originating at the portion, variation in the flow path resistance in each of the individual supply flow paths, and the like are prevented. 
     Further, in the above configuration, it is desirable to adopt a configuration in which a thickness of one of a first partition wall separating the plurality of individual supply flow paths or a second partition wall separating the plurality of individual outlet flow paths is thicker than a thickness of the other in the flow path arrangement direction, and a length of the one is longer than a length of the other in the flow path extending direction. 
     According to this configuration, when the constituent members of the liquid ejecting head are bonded in a state of being laminated to each other, even if the relative positions of the constituent members are slightly deviated from each other, since the one of the first partition wall or the second partition wall fits within the range of the other when viewed from the laminating direction of the constituent members, it is possible to receive the load during the bonding on the partition walls, and it is possible to more reliably bond each of the constituent members, particularly the members in which the individual supply flow paths are formed and the members in which the individual outlet flow paths are formed. 
     In the above configuration, it is desirable to adopt a configuration in which a position of an exit of the individual outlet flow paths on the second common flow path side in the flow path extending direction positioned closer to end sides in the flow path arrangement direction of the plurality of individual outlet flow paths and a position of an exit of the individual outlet flow paths on the second common flow path side positioned closer to a center side in the flow path arrangement direction are different. 
     According to this configuration, even when there is a difference in the structure of the walls partitioning the individual outlet flow paths positioned on the end portion sides in the flow path arrangement direction and the individual outlet flow paths positioned closer to the center side, respectively, since the positions of the exits of the individual outlet flow paths positioned closer to the end sides in the flow path arrangement direction and the positions of the exits of the individual outlet flow paths positioned closer to the center side in the flow path arrangement direction are different, the flow path resistance of each of the individual outlet flow paths is aligned. As a result, the ejection characteristics such as the ejected ink amount of each nozzle corresponding to each individual outlet flow path and the flight speed are aligned as much as possible. 
     In the above configuration, it is desirable to adopt a configuration in which two nozzle groups formed by arranging the nozzles are arranged in a direction perpendicular to an arrangement direction of the nozzles, two first common flow paths forming a pair are disposed between two second common flow paths forming a pair in the arrangement direction of the nozzle groups, and the nozzle groups are disposed between the two first common flow paths. 
     According to this configuration, the pair of first common flow paths is disposed between the pair of second common flow paths in the arrangement direction of the nozzle groups and the nozzle groups are disposed between the first common flow paths, and so it is possible to dispose the nozzle groups at a higher density and it is possible to more efficiently better layout the liquid flow paths and the like including the common flow paths corresponding to each of the nozzle groups and the pressure chambers in the inner portion of the liquid ejecting head. 
     The liquid ejecting apparatus according to the present disclosure includes the liquid ejecting head of one of the configurations described above, a liquid storage portion storing a liquid to be supplied to the liquid ejecting head, and a circulation mechanism for circulating the liquid between the liquid storage portion and the liquid ejecting head. 
     According to the present disclosure, in a configuration in which a liquid is circulated between a liquid storage portion and a liquid ejecting head, since it is possible to reduce the size of the liquid ejecting head, it is possible to reduce the size of the entire apparatus. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a front view explaining the configuration of an embodiment of a liquid ejecting apparatus. 
         FIG. 2  is a sectional diagram explaining the configuration of an embodiment of a liquid ejecting head. 
         FIG. 3  is an enlarged sectional diagram of a portion of the liquid ejecting head. 
         FIG. 4  is a plan view explaining the configuration of a common liquid chamber. 
         FIG. 5  is a plan view explaining the configuration of a common outlet liquid chamber. 
         FIG. 6  is a schematic diagram comparing the positions and dimensions of a supply port partition wall and an outlet flow path partition wall. 
         FIG. 7  is a schematic diagram explaining the flow of ink from individual supply flow paths toward a first common flow path side. 
         FIG. 8  is a schematic diagram explaining the flow of ink from the individual supply flow path toward the first common flow path side. 
         FIG. 9  is a sectional diagram explaining the configuration of a liquid ejecting head according to a second embodiment. 
         FIG. 10  is a sectional diagram explaining a modification example of the configuration of the liquid ejecting head according to the second embodiment. 
         FIG. 11  is a sectional diagram explaining the configuration of a liquid ejecting head according to a third embodiment. 
         FIG. 12  is a sectional diagram explaining the configuration of a liquid ejecting head according to a fourth embodiment. 
         FIG. 13  is a sectional diagram explaining the configuration of a liquid ejecting head according to a fifth embodiment. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. In the embodiments described hereinafter, although various limitations are made as favorable specific examples of the present disclosure, the scope of the present disclosure is not limited to these modes as long as there is no description particularly limiting the present disclosure. The following description will be carried out using an ink jet recording apparatus (hereinafter, a printer)  1  equipped with an ink jet recording head (hereinafter, a recording head)  10  which is a type of liquid ejecting head as an example of the liquid ejecting apparatus of the present disclosure. 
       FIG. 1  is a plan view illustrating the configuration of the printer  1 . The printer  1  according to the present embodiment is an apparatus which performs recording of an image, text, or the like by ejecting liquid ink (a type of liquid in the present disclosure) from the recording head  10  onto the surface of a recording medium S such as recording paper, cloth, or resin film. The printer  1  is provided with a frame  2  and a platen  3  disposed inside the frame  2  and the recording medium S is transported onto the platen  3  by a transport mechanism (not illustrated). A guide rod  4  is installed in parallel with the platen  3  inside the frame  2 . The recording head  10  and a carriage  5  accommodating a flow path member  6  are supported to be capable of sliding on the guide rod  4 . The flow path member  6  performs transferring of ink between the recording head  10  and an ink cartridge  13 . The carriage  5  is configured to move reciprocally along the guide rod  4  in a main scanning direction perpendicular to a transport direction of the recording medium S. The printer  1  in the present embodiment performs a recording operation by ejecting ink from nozzles  28  (refer to  FIG. 2  and the like) of the recording head  10  while moving the carriage  5  reciprocally relative to the recording medium S. 
     The ink cartridge  13 , which is a type of liquid storage portion, is equipped on one side of the frame  2 . The ink stored in the ink cartridge  13  is introduced into the flow path member  6  through an ink supply tube  15  by the pressure of a pump  14  and is subsequently supplied to the recording head  10 . The ink from the recording head  10  is configured to be recovered in the ink cartridge  13  through the flow path member  6  and an ink recovery tube  16 . In other words, the pump  14  functions as a circulation mechanism that circulates the ink between the ink cartridge  13  and the recording head  10 . Although not illustrated, an inner portion of the flow path member  6  is provided with a flow path which supplies the ink introduced from the ink supply tube  15  to the recording head  10  side and a flow path which sends the ink discharged from the recording head  10  out to the ink recovery tube  16 . The inner portion of the flow path member  6  is provided with an adjusting section which adjusts the supply pressure of the ink to the recording head  10 , a filter (not illustrated) which traps bubbles and foreign matter contained in the ink, and the like. Instead of the configuration in which the circulation of ink is performed between the ink cartridge  13  and the recording head  10  as described above, a configuration may be adopted in which a sub-tank (that is, a type of liquid storage portion) that is not illustrated is provided between the ink cartridge  13  and the recording head  10  and the circulation of the ink is performed between the sub-tank and the recording head  10 . 
     Inside the frame  2 , a capping mechanism  21  including a cap  22  sealing the nozzle surface of the recording head  10  is installed at a home position provided on one side in a movement range of the recording head  10 . The capping mechanism  21  seals the nozzle surface of the recording head  10  in the standby state at the home position using the cap  22  to suppress the evaporating of the solvent of the ink from the nozzle  28 . The capping mechanism  21  is capable of performing a cleaning operation of making the inside of the sealing space portion a negative pressure in a state in which the nozzle surface of the recording head  10  is sealed and forcibly sucking ink and bubbles from the nozzles  28 . 
     Next, the configuration of the recording head  10  in the present embodiment will be described. 
       FIG. 2  is a sectional diagram of the recording head  10 , and  FIG. 3  is an enlarged sectional diagram illustrating a portion of the recording head  10  in  FIG. 2 . In the recording head  10  according to the present embodiment, a plurality of constituent members such as a fixed plate  23 , a nozzle plate  20 , a first communication plate  24 , a second communication plate  25 , an actuator substrate  26 , and a case  27  are laminated and bonded by an adhesive or the like to unitize the constituent members. Hereinafter, the laminating direction of each of the constituent members of the recording head  10  will be described as the vertical direction or a third direction Z as described later, as appropriate. 
     The actuator substrate  26  in the present embodiment is provided with a pressure chamber forming substrate  29  in which pressure chambers  30  communicating with the nozzles  28  formed in the nozzle plate  20  are formed, piezoelectric elements  31  serving as drive elements that generate pressure oscillation in the ink inside each of the pressure chambers  30 , oscillating plates  33  provided between the pressure chamber forming substrate  29  and the piezoelectric elements  31 , and a protective substrate  32  protecting the piezoelectric elements  31 . A wiring space portion  32   a , through which a wiring member electrically coupled to the piezoelectric elements  31  is inserted, is provided at a substantially central portion of the protective substrate  32  in plan view. Lead electrodes of the piezoelectric elements  31  are disposed inside the wiring space portion  32   a  and wiring terminals of the wiring member are electrically coupled to the lead electrodes. Drive signals and the like sent from a control section of the printer  1  are supplied to the piezoelectric elements  31  through the wiring member. 
     The pressure chamber forming substrate  29  of the actuator substrate  26  is made of a silicon single crystal substrate. The plurality of pressure chambers  30  is arranged in the pressure chamber forming substrate  29  along a first direction X (in other words, a nozzle row direction) in which each of the nozzles  28  are arranged corresponding to the plurality of nozzles  28 . The pressure chamber  30  is a vacant portion that is long in a second direction Y perpendicular to the first direction X. A first nozzle communication port  34  of the first communication plate  24  communicates with an end portion on one side of the pressure chamber  30  in the second direction Y and the individual supply flow path  39  communicates with an end portion on the other side of the pressure chamber  30  via a supply port  44 . On the pressure chamber forming substrate  29  in the present embodiment, a total of two rows of pressure chamber groups, which are the rows of the pressure chambers  30 , are arranged in the second direction Y corresponding to the two nozzle rows formed in the nozzle plate  20 . The pressure chamber forming substrate  29  may be made of a metal such as stainless steel. 
     The oscillating plate  33  is laminated on the top surface of the pressure chamber forming substrate  29  (in other words, the surface on the opposite side to the first communication plate  24  side) and the top portion opening of the pressure chamber  30  is sealed by the oscillating plate  33 . In other words, the oscillating plate  33  partitions a portion of the pressure chamber  30 . The oscillating plate  33  includes, for example, an elastic film formed of silicon dioxide (SiO 2 ) formed on the top surface of the pressure chamber forming substrate  29  and an insulator film formed of zirconium oxide (ZrO 2 ) formed on the elastic film. The piezoelectric elements  31  is laminated on the oscillating plate  33  in regions corresponding to the pressure chambers  30 , respectively. The oscillating plate  33  may be made of a metal such as nickel. 
     The piezoelectric element  31  of the present embodiment is a so-called flexural mode piezoelectric element. In the piezoelectric element  31 , for example, a bottom electrode layer, a piezoelectric layer, and a top electrode layer (none of which are illustrated) are sequentially laminated on the oscillating plate  33 . The piezoelectric element  31  configured in this manner is deformed in a flexural manner in the vertical direction when an electric field is applied across the bottom electrode layer and the top electrode layer according to the potential difference between the two electrodes. In the present embodiment, the plurality of piezoelectric elements  31  is formed on the oscillating plates  33  to correspond to the plurality of pressure chambers  30  and a total of two rows of the piezoelectric elements  31  are provided to correspond to each of the rows of pressure chambers  30 . 
     The protective substrate  32  is laminated on the oscillating plates  33  to cover the rows of the plurality of piezoelectric elements  31 . In the inner portion of the protective substrate  32 , a long accommodation space  32   b  capable of accommodating a row of the piezoelectric elements  31  is formed. The accommodation space  32   b  is a recess formed from the bottom surface side (that is, the oscillating plate  33  side) of the protective substrate  32  toward the top surface side (that is, the case  27  side) to the middle in the height direction of the protective substrate  32 . In the protective substrate  32  in the present embodiment, the accommodation space  32   b  is formed on both sides of the wiring space portion  32   a.    
     The first communication plate  24  having a wider area than the actuator substrate  26  is bonded to the bottom surface of the actuator substrate  26 . The second communication plate  25  is bonded to the bottom surface of the first communication plate  24  with a first flexible portion  36 , which will be described later, interposed therebetween. The communication plates  24  and  25  are made of a silicon single crystal substrate similar to that of the pressure chamber forming substrate  29 . The first nozzle communication ports  34  causing the pressure chambers  30  and second nozzle communication ports  35  of the second communication plate  25  to communicate, a common liquid chamber  37  configuring a portion of a first common flow path  40  provided to be shared by each of the pressure chambers  30 , the individual supply flow paths  39  causing the common liquid chamber  37  and the pressure chamber  30  to communicate, a communication liquid chamber  49  causing the common outlet liquid chamber  48  of the second communication plate  25  and an outlet flow path  46  of the case  27  to communicate are formed in the first communication plate  24  in the present embodiment. The communication liquid chamber  49  is a liquid chamber including an opening having a shape and dimensions conforming to the opening shape on the bottom surface side of the outlet flow path  46  of the case  27  and penetrates the first communication plate  24  in the plate thickness direction. The common liquid chamber  37  is a liquid chamber provided to be shared by the plurality of pressure chambers  30 , in other words, the plurality of nozzles  28  and extends in series along the nozzle row direction. In the present embodiment, two common liquid chambers  37  are formed corresponding to each nozzle row of the nozzle plate  20 . A first compliance portion  42  is provided at a position corresponding to the bottom portion of the common liquid chamber  37 . The details of the first compliance portion  42  will be described later. The communication plates  24  and  25  may be made of a metal such as stainless steel. 
       FIG. 4  is a plan view explaining the configuration of the common liquid chamber  37 . The hatched portion indicates the range of the first compliance portion  42  described later. The common liquid chamber  37  in the present embodiment is configured from a first liquid chamber  37   a  communicating with an inlet flow path  45  of the case  27  and a second liquid chamber  37   b  causing the first liquid chamber  37   a  and the supply port  44  to communicate. The first liquid chamber  37   a  is a liquid chamber including an opening having a shape and dimensions conforming to the opening shape on the bottom surface side of the inlet flow path  45  of the case  27  and penetrates the first communication plate  24  in the plate thickness direction. The second liquid chamber  37   b  is a portion that is recessed from the bottom surface side to the middle in the plate thickness direction while leaving a thin portion  47  on the top surface side of the first communication plate  24 . The second liquid chamber  37   b  is formed adjacent to the first liquid chamber  37   a  in the second direction Y. The second liquid chamber  37   b  is positioned closer to the nozzle  28  side than the first liquid chamber  37   a . The thin portion  47  configures the ceiling surface of the second liquid chamber  37   b . One end portion of the second liquid chamber  37   b  in the second direction Y communicates with the first liquid chamber  37   a , and on the other hand, the other end portion of the second liquid chamber  37   b  in the second direction Y is formed at a position overlapping with a portion of the pressure chamber  30  when viewed in the third direction Z which is the laminating direction of each of the constituent members of the recording head  10 . In the other end portion of the second liquid chamber  37   b , a plurality of supply ports  44  penetrating the thin portion  47  are formed along the first direction X corresponding to each of the plurality of pressure chambers  30  of the pressure chamber forming substrate  29 . The bottom end of the supply port  44  communicates with the second liquid chamber  37   b  and the top end of the supply port  44  communicates with the pressure chamber  30  of the pressure chamber forming substrate  29 . 
     A plurality of supply port partition walls  38  (corresponding to the first partition wall in the present disclosure) partitioning the adjacent supply ports  44  from each other are formed in the thin portion  47  of the second liquid chamber  37   b  in the present embodiment. The supply port partition wall  38  is a wall extending along the second direction Y from the side surface of the other end of the second liquid chamber  37   b  in the second direction Y toward the first liquid chamber  37   a  side at one end and protrudes from the bottom surface of the thin portion  47  toward the second communication plate  25  side. The height of the supply port partition wall  38  in the third direction Z in the present embodiment is aligned to the depth of the second liquid chamber  37   b  in the third direction Z. The second communication plate  24  is bonded to the surface of the supply port partition wall  38  on the second communication plate  24  side via the first flexible portion  36 , so that the individual supply flow path  39  extending along the second direction Y toward the supply port  44  from the first liquid chamber  37   a  side is defined. A plurality of the individual supply flow paths  39  is formed along the first direction X corresponding respectively to the plurality of pressure chambers  30  of the pressure chamber forming substrate  29 . The supply port  44  described above is a portion where the flow path sectional area is set to be small as compared to that of the individual supply flow path  39  and functions as a narrowed portion imparting flow path resistance on the ink flowing from the common liquid chamber  37  into the pressure chamber  30 . 
     Here, of the individual supply flow paths  39 , regarding individual supply flow paths  39   a  and  39   b  positioned at both ends of the second liquid chamber  37   b  in the second direction Y (that is, the flow path arrangement direction), one wall of the walls partitioning the flow path is the supply port partition wall  38 , whereas the other wall is a side wall partitioning the common liquid chamber  37 . Since the dimension of the side wall of the common liquid chamber  37  in the flow path extending direction, that is, the second direction Y is sufficiently longer than the length of the supply port partition wall  38  in the second direction Y, when the lengths of the supply port partition walls  38  are uniformly aligned for all of the individual supply flow paths  39 , the flow path resistances of the individual supply flow paths  39   a  and  39   b  at both ends are high as compared to the flow path resistances of the other individual supply flow paths  39 . In other words, due to the difference in structure of the walls partitioning the individual supply flow paths  39   a  and  39   b  positioned on the end portion side in the flow path arrangement direction and the individual supply flow path  39  positioned closer to the center side, the flow path resistance changes. 
     Therefore, in the present embodiment, a length L 1 ′ of the supply port partition walls  38   a  and  38   b  that define the individual supply flow paths  39   a  and  39   b  at both ends is set to be shorter than a length L 1  of the supply port partition walls  38  that define the other individual supply flow paths  39  positioned closer to the center side in the first direction X. In other words, in the second direction Y, the exits of the individual supply flow paths  39   a  and  39   b  on the first common flow path  40  side are positioned closer to the supply port  44  side than the exits of the other individual supply flow paths  39  on the first common flow path  40  side. The exit of each individual supply flow path  39  on the first common flow path  40  side is an opening of the individual supply flow path  39  defined by the end of the supply port partition wall  38  partitioning the individual supply flow path  39  on the first common flow path  40  side. In this manner, even when there is a difference in the structure of the walls partitioning the individual supply flow paths  39  positioned on the end portion sides in the first direction X and the individual supply flow paths  39  positioned closer to the center side, respectively, since the positions of the exits of the individual supply flow paths  39   a  and  39   b  positioned closer to the end sides and the positions of the exits of the individual supply flow paths  39  positioned closer to the center side are different, the flow path resistance of each of the individual supply flow paths  39  is aligned as much as possible. As a result, the ejection characteristics such as the amount of ink ejected from each nozzle  28  in the nozzle row and the flight speed (more specifically, the initial velocity during ejection) are aligned as much as possible. In the present embodiment, although an example is given of a configuration in which the lengths of the supply port partition walls  38   a  and  38   b  defining the individual supply flow paths  39   a  and  39   b  at both ends in the first direction X are set to be shorter than the lengths of the supply port partition walls  38  of the other individual supply flow paths  39 , the configuration is not limited thereto. For example, it is also possible to adopt a configuration in which the lengths of the supply port partition walls  38  corresponding to the plurality of individual supply flow paths  39  at both end portions in the first direction X is gradually reduced from the center side toward the end side in the first direction X. Accordingly, the flow path resistance of each of the individual supply flow paths  39  is more effectively aligned. 
     The second nozzle communication port  35  causing the first nozzle communication port  34  and the nozzle  28  to communicate with each other, the common outlet liquid chamber  48  configuring a portion of the second common flow path  41  provided to be shared by each of the pressure chambers  30 , an individual outlet flow path  50  causing the common outlet liquid chamber  48  and the second nozzle communication port  35  to communicate with each other, and a first compliance space  51  configuring the first compliance portion  42  are formed in the second communication plate  25  in the present embodiment. The common outlet liquid chamber  48  is a liquid chamber provided to be shared by the plurality of pressure chambers  30 , in other words, the plurality of nozzles  28  and extends in series along the first direction X. In the present embodiment, two common outlet liquid chambers  48  are formed corresponding to each nozzle row of the nozzle plate  20 . A second compliance portion  43  is provided on the bottom portion of the common liquid chamber  37 , that is, on the nozzle plate  20  side. The details of the second compliance portion  43  will be described later. 
       FIG. 5  is a plan view explaining the configuration of the common outlet liquid chamber  48 . The hatched portion indicates the range of the second compliance portion  43  described later. The common outlet liquid chamber  48  in the present embodiment is configured by a first outlet liquid chamber  48   a  communicating with the communication liquid chamber  49  of the first communication plate  24  and a second outlet liquid chamber  48   b  causing the first outlet liquid chamber  48   a  and the second nozzle communication port  35  to communicate with each other. The first outlet liquid chamber  48   a  is a liquid chamber including an opening having a shape and dimension conforming to the opening shape on the bottom surface side of the communication liquid chamber  49  of the first communication plate  24  and is a portion penetrating the second communication plate  25  in the plate thickness direction. The second outlet liquid chamber  48   b  is a portion that is recessed from the bottom surface side to the middle in the plate thickness direction while leaving a thin portion  52  on the top surface side of the second communication plate  25 . The second outlet liquid chamber  48   b  is formed adjacent to the first outlet liquid chamber  48   a  in the second direction Y. The second outlet liquid chamber  48   b  is positioned closer to the nozzle  28  side than the first outlet liquid chamber  48   a . The thin portion  52  configures the ceiling surface of the second outlet liquid chamber  48   b . One end portion of the second outlet liquid chamber  48   b  in the second direction Y communicates with the first outlet liquid chamber  48   a , whereas the other end portion of the second outlet liquid chamber  48   b  in the second direction Y is formed at a position corresponding to the first nozzle communication port  34  of the first communication plate  24 . At the other end portion of the second outlet liquid chamber  48   b , a plurality of the second nozzle communication ports  35  penetrating the second communication plate  25  in the thickness direction is formed along the first direction X corresponding to the plurality of pressure chambers  30  of the pressure chamber forming substrate  29 , respectively. The bottom end of the second nozzle communication port  35  communicates with the nozzle  28  and the top end of the second nozzle communication port  35  communicates with the first nozzle communication port  34  of the first communication plate  24 . 
     A plurality of outlet flow path partition walls  53  (corresponding to the second partition walls in the present disclosure) partitioning adjacent second nozzle communication ports  35  from each other is formed in the thin portion  52  of the second outlet liquid chamber  48   b . The outlet flow path partition wall  53  is a wall extending along the second direction Y from the side surface of the other end of the second outlet liquid chamber  48   b  in the second direction Y toward the first outlet liquid chamber  48   a  side at one end and protrudes from the bottom surface of the thin portion  52  toward the bottom surface side of the second communication plate  25 , in other words, toward the nozzle plate  20  side. The height of the outlet flow path partition wall  53  in the third direction Z in the present embodiment is aligned with the depth of the second outlet liquid chamber  48   b  in the third direction Z. The nozzle plate  20  is bonded to the surface of the outlet flow path partition wall  53  on the nozzle plate  20  side via a second flexible portion  54 , so that the individual outlet flow path  50  extending along the second direction Y from the second nozzle communication port  35  side toward the first outlet liquid chamber  48   a  side is defined. A plurality of the individual outlet flow paths  50  is formed along the first direction X corresponding respectively to the plurality of pressure chambers  30  of the pressure chamber forming substrate  29 . 
     Of the individual outlet flow paths  50 , individual outlet flow paths  50   a  and  50   b  positioned at both ends of the second outlet liquid chamber  48   b  in the second direction Y have high flow path resistance as compared to the flow path resistance of the other individual outlet flow paths  50  for the same reason as the individual supply flow paths  39   a  and  39   b . Therefore, in the present embodiment, a length L 2 ′ of the outlet flow path partition walls  53   a  and  53   b  that define the individual outlet flow paths  50   a  and  50   b  at both ends is set to be shorter than a length L 2  of the outlet flow path partition wall  53  that define the other individual outlet flow paths  50  positioned closer to the center side in the first direction X. Accordingly, the flow path resistances of the individual outlet flow paths  50   a  and  50   b  at both ends and the flow path resistances of the other individual outlet flow paths  50  are aligned as much as possible. As a result, the ejection characteristics such as the ejected ink amount of each nozzle  28  in the nozzle row and the flight speed are aligned as much as possible. In the present embodiment, although an example is given of a configuration in which the lengths of the outlet flow path partition walls  53   a  and  53   b  defining the individual outlet flow paths  50   a  and  50   b  at both ends in the first direction X are set to be shorter than the lengths of the outlet flow path partition walls  53  of the other individual outlet flow paths  50 , the configuration is not limited thereto. For example, it is also possible to adopt a configuration in which the lengths of the outlet flow path partition walls  53  corresponding to the plurality of individual outlet flow paths  50  at both end portions in the first direction X is gradually reduced from the center side toward the end side in the first direction X. Accordingly, the flow path resistance of each of the individual outlet flow paths  50  is more effectively aligned. 
     Narrowed portions  56  each having a flow path sectional area set to be small as compared to that of the individual outlet flow path  50  are provided at the boundary portion between each individual outlet flow path  50  and the second nozzle communication port  35 . In the present embodiment, a portion protruding from the bottom surface of the thin portion  52  toward the bottom surface side of the second communication plate  25 , in other words, toward the nozzle plate  20  side is formed and the protruding end surface is positioned slightly closer to the thin portion  52  side than the bottom surface of the second communication plate  25 . The nozzle plate  20  is bonded to the bottom surface of the second communication plate  25  via the second flexible portion  54 , so that the narrowed portion  56  is formed between the protruding portion and the nozzle plate  20 . The narrowed portions  56  are flow paths causing the individual outlet flow paths  50  and the second nozzle communication ports  35  to communicate with each other, respectively, and impart flow path resistance to the ink flowing from the second nozzle communication ports  35  into the individual outlet flow paths  50 . The narrowed portion  56  is not limited to one formed by a portion protruding from the thin portion  52 , that is, one narrowing the flow path in the third direction Z, and for example, by partially increasing the thickness of the wall of the outlet flow path partition wall  53  to partially narrow the flow path width of the individual outlet flow path  50 , it is possible to adopt a configuration of rendering the flow path sectional area of the individual outlet flow path  50  in the first direction X narrower than the other portions or a combination of these configurations. 
     The nozzle plate  20  having a plurality of nozzles  28  formed therein is bonded to the bottom surface of the second communication plate  25 . The nozzle plate  20  in the present embodiment is configured by a silicon single crystal substrate, for example. The nozzle plate  20  is bonded by an adhesive or the like in a state in which the plurality of second nozzle communication ports  35  and the plurality of nozzles  28  individually communicate with each other at the bottom surface of the first communication plate  24 . In the nozzle plate  20  in the present embodiment, a total of two nozzle groups (that is, nozzle rows) in which the plurality of nozzles  28  is arranged are lined up in the second direction Y. In the nozzle plate  20 , a through hole penetrating the nozzle plate  20  in the thickness direction is provided in a region corresponding to the common outlet liquid chamber  48  positioned closer to the outside in the second direction Y than the nozzle group. The surface of the through hole on the second communication plate  25  side is sealed by the second flexible portion  54  and the surface of the through hole on the opposite side to the second communication plate  25  side is sealed by the fixed plate  23 , and so, a second compliance space  55  is defined. The flexible region of the second flexible portion  54  defining the second compliance space  55  functions as the second compliance portion  43  which is displaced to the second common flow path  41  side or the second compliance space  55  side according to the pressure oscillation inside the second common flow path  41 . Details of the second compliance portion  43  will be described later. The nozzle plate  20  may be made of a metal such as stainless steel. 
       FIG. 6  is a schematic diagram comparing the positions and dimensions of the supply port partition wall  38  and the outlet flow path partition wall  53  when viewed from the third direction Z in a bonded state in a state in which the first communication plate  24  and the second communication plate  25  are positioned. When each of the constituent members of the nozzle plate  20 , the second communication plate  25 , the first communication plate  24 , and the actuator substrate  26  are laminated and bonded to each other, a load is applied in the laminating direction, that is, the third direction Z. In this regard, in the present embodiment, a thickness T 2  of the outlet flow path partition wall  53  in the first direction X is set to be larger than a thickness T 1  of the supply port partition wall  38  in the first direction X. The length L 2  of the outlet flow path partition wall  53  in the first direction X is set to be larger than the length L 1  of the supply port partition wall  38  in the second direction Y (in other words, the flow path extending direction). Therefore, in the supply port partition wall  38  and the outlet flow path partition wall  53  which are disposed at positions overlapping each other when viewed in the third direction Z, which is the laminating direction of each constituent member, a configuration is adopted in which the other supply port partition wall  38  is positioned within the range of the one outlet flow path partition wall  53 . Since the dimensional relationship between the supply port partition wall  38  and the outlet flow path partition wall  53  is set in this manner, when the nozzle plate  20 , the second communication plate  25 , the first communication plate  24 , and the actuator substrate  26  are bonded to each other, even if the relative positions of each of the constituent members deviate within a range of tolerance, the supply port partition wall  38  fits within the range of the outlet flow path partition wall  53 , so that the partition walls  38  and  53  are capable of receiving the load during the bonding and it is possible to more reliably bond each of the constituent members, particularly the first communication plate  24  and the second communication plate  25 . A configuration may be adopted in which the size relationship of the dimensions between the outlet flow path partition wall  53  and the supply port partition wall  38  is reversed. Depending on the positional relationship between the base ends of the partition walls in the second direction, that is, the end of the supply port partition wall  38  on the supply port  44  side and the end of the outlet flow path partition wall  53  on the second nozzle communication port  35  side, it is also conceivable to adopt a configuration in which the length of the partition wall having the larger thickness is shorter than the length of the other partition wall. In other words, in the second direction Y, it is anticipated that there is a case in which position of the base end of the partition wall having the smaller thickness is positioned closer to the nozzle  28  side than the position of the base end of the partition wall having the larger thickness. In this case, as long as a configuration is adopted in which the end of the thick partition wall on the common flow path side in the second direction Y is positioned closer to the common flow path side than the end of the thin partition wall on the common flow path side in the second direction Y, it is similarly possible to receive the load during the bonding using the partition wall, and it becomes possible to more reliably bond each of the constituent members, particularly the first communication plate  24  and the second communication plate  25 , to each other. 
     Each of the constituent members of the nozzle plate  20 , the second communication plate  25 , the first communication plate  24 , and the actuator substrate  26  is bonded to the case  27 . As illustrated in  FIG. 2 , an accommodation space portion  58  accommodating the actuator substrate  26  is formed in the bottom surface side of the case  27  in the present embodiment. The first communication plate  24  is bonded to the bottom surface of the case  27  in a state in which the actuator substrate  26  is accommodated in the accommodation space portion  58 . An insertion space portion  59  communicating with the accommodation space portion  58  is provided at a substantially central portion of the case  27  in plan view. The insertion space portion  59  also communicates with the wiring space portion  32   a  of the actuator substrate  26 . The wiring member is configured to be inserted into the wiring space portion  32   a  through the insertion space portion  59 . In the inner portion of the case  27 , the inlet flow path  45  communicating with the common liquid chamber  37  of the first communication plate  24  is formed on both sides of the insertion space portion  59  and the accommodation space portion  58  in the second direction Y. Furthermore, the outlet flow paths  46  communicating with the communication liquid chambers  49  of the first communication plate  24  are formed closer to the outside in the second direction Y than the inlet flow paths  45 , respectively. On the top surface of the case  27 , inlets  62  communicating with each of the inlet flow paths  45  and outlets  63  communicating with the outlet flow paths  46  are provided. The inlet  62  is a portion at which the ink sent from the ink cartridge  13  side through the ink supply tube  15  is introduced via the flow path member  6 . The outlet  63  is a portion at which the ink from the second common flow path  41  is sent to the ink cartridge  13  side via the flow path member  6 . In the present embodiment, the ink sent from the ink cartridge  13  side by driving the pump  14  is introduced into the first common flow path  40  from the inlet  62 . The ink introduced into the first common flow path  40  is supplied from each individual supply flow path  39  to each pressure chamber  30 , and is supplied to the nozzle  28  through the first nozzle communication port  34  and the second nozzle communication port  35 . The ink flowing from the second nozzle communication port  35  toward the second common flow path  41  through the narrowed portion  56  and the individual outlet flow path  50  passes from the outlet  63  through the ink recovery tube  16  via the flow path member  6  and is recovered in the ink cartridge  13  side. In other words, the ink is circulated between the ink cartridge  13  and the ink flow paths inside the recording head  10 . In the present embodiment, the ink flow paths (that is, liquid flow paths) inside the recording head  10  are a series of flow paths from the inlet  62  reaching the first common flow path  40 , the individual supply flow paths  39 , the pressure chambers  30 , the nozzle communication ports  34  and  35 , the nozzles  28 , the individual outlet flow paths  50 , the second common flow path  41 , and the outlet  63 . The ink circulation path may be reversed. In other words, it is also possible to adopt a configuration in which the ink from the ink cartridge  13  is introduced into the second common flow path  41 , passes through the nozzle communication ports  34  and  35  and the pressure chambers  30 , and goes from the first common flow path  40  to the ink cartridge  13 . 
     The fixed plate  23  is a plate material made of a metal such as stainless steel, for example. In the fixed plate  23  in the present embodiment, in order to expose the nozzles  28  at positions corresponding to the regions where the nozzles  28  are formed in the nozzle plate  20 , openings  23   a  are formed in a state of penetrating in the thickness direction. In the present embodiment, the fixed plate  23  blocks the opening portion on the bottom surface side of the through hole formed in the nozzle plate  20  to partition a portion of the second compliance space  55 . 
     Next, the first compliance portion  42  will be described. The first compliance space  51  is provided on the first communication plate  24  side of the second communication plate  25 , that is, on the top surface side opposite to the second outlet liquid chamber  48   b  side. The first compliance space  51  is a recessed portion that is recessed from the top surface of the second communication plate  25  to the middle of the thin portion  52  in the thickness direction (that is, the third direction Z). The portion in which the opening surface of the first compliance space  51  is sealed by the first flexible portion  36  functions as the first compliance portion  42 . A region of the first flexible portion  36  that is substantially deformable when pressure is applied is a flexible region. The first compliance space  51  in the present embodiment is open to the atmosphere through an atmosphere open path which is not illustrated. The first flexible portion  36  is made of a flexible thin material such as polyphenylene sulfide, a silicon nitride film, or a tantalum oxide film, for example. The second flexible portion  54 , which will be described later, has a similar configuration to the first flexible portion  36 . The first flexible portion  36  partitions a portion of the common liquid chamber  37 , that is, a portion of the first common flow path  40 . Hereinafter, the state of the flexible region of the first flexible portion  36  in a state in which the pressure oscillation accompanying the ink ejection from the nozzles  28  does not occur in the ink flow paths of the recording head  10  is referred to as an initial state. Although it is assumed that the flexible region of the first flexible portion  36  is substantially parallel to the opening surface of the first compliance space  51  in the initial state, the flexible region in the initial state may slightly bend to the first compliance space  51  side or the first common flow path  40  side, due to factors such as the weight of the flexible region itself and the weight and temperature of the ink inside the first common flow path  40 . The first flexible portion  36  or the second flexible portion  54  may be made of a metal such as stainless steel. 
     The flexible region of the first flexible portion  36  of the first compliance portion  42  is displaced from the initial state (in other words, flexed) according to the pressure oscillation (in other words, pressure change) of the ink inside the first common flow path  40 . More specifically, when the pressure of the ink inside the first common flow path  40  is higher than the internal pressure of the first compliance space  51 , the flexible region of the first flexible portion  36  is displaced from the initial state to the first compliance space  51  side. When the pressure of the ink inside the first common flow path  40  is lower than the internal pressure of the first compliance space  51 , the flexible region of the first flexible portion  36  is displaced from the initial state to the first common flow path  40  side. Accordingly, the pressure oscillation generated in the ink inside the ink flow path, particularly the ink inside the first common flow path  40  in accordance with the recording operation of the recording head  10 , that is, the ink ejection operation, in other words, the residual oscillation after the ink ejection is alleviated. Here, a flat state in which the first flexible portion  36  is not flexed, in other words, in a state in which the first flexible portion  36  is parallel to the top and bottom surfaces of the substrate (that is, the first communication plate  24  in the present embodiment) on which the first compliance portion  42  is provided, the thickness direction of the first flexible portion  36  is the thickness direction of the first compliance portion  42 . In the present embodiment, the thickness direction of the first compliance portion  42  is the third direction Z. Similarly, the thickness direction of the second compliance portion  43  described later is the third direction Z. 
     As illustrated in  FIG. 4 , the first compliance portion  42  is formed to span from one end to the other end of the first common flow path  40  in the first direction X and is formed to span from the end on the opposite side to the supply port  44  in the second direction Y to a point slightly in front of the supply port partition wall  38 . Here, when an inner dimension, that is, the width of the individual supply flow path  39  in the arrangement direction of each of the individual supply flow paths  39  in the thin portion  47 , that is, in the first direction X is denoted by W (hereinafter, the width of the individual supply flow path  39  is denoted by W 1  and the width of the individual outlet flow path  50  is denoted by W 2 ), an edge closest to the individual supply flow path  39  of the flexible region of the first flexible portion  36  in the extending direction of the individual supply flow path  39 , that is, in the second direction Y, in other words, the end on the individual supply flow path  39  side in the second direction Y is disposed within W 1  from the exit of the individual supply flow path  39  on the first common flow path  40  side. In the present embodiment, the end of the flexible region of the first compliance portion  42  is disposed within W 1  from the exit on the first common flow path  40  side of the individual supply flow paths  39  other than the individual supply flow paths  39   a  and  39   b  positioned at both ends in the first direction X of the second liquid chamber  37   b . By disposing the first compliance portion  42  as close as possible to the exit of the individual supply flow path  39  in this manner, the pressure oscillation transmitted through the inner portion of the individual supply flow path  39  is alleviated more quickly. In the present embodiment, the first compliance portion  42  is disposed at a position within W 1  from the exit of the individual supply flow path  39  on the first common flow path  40  side and does not overlap each of the individual supply flow paths  39  when viewed in the third direction Z. As a result, since the flexible region of the first compliance portion  42  and the supply port partition wall  38  defining the individual supply flow path  39  do not interfere with each other, when the flexible region of the first compliance portion  42  is deformed, stress being focused on a portion in contact with the supply port partition wall  38  and the first flexible portion  36  of the first compliance portion  42  being damaged originating at the same portion, variation in the flow path resistance in each of the individual supply flow paths  39 , and the like are prevented. 
       FIGS. 7 and 8  are schematic diagrams explaining the flow of ink from the individual supply flow paths  39  toward the first common flow path  40 , that is, explaining the flow of ink when the pressure of the ink in the inner portion of the pressure chambers  30  increases in accordance with the ink ejection operation. Here, when ink is independently ejected from a predetermined nozzle  28 , the ink flowing out from the exit of the individual supply flow path  39  corresponding to the nozzle  28  to the first common flow path  40  side is, as illustrated in  FIG. 7 , capable of dispersing over a relatively wide range in the first common flow path  40 . On the other hand, when the ink is ejected from the plurality of nozzles  28  at the same time, as illustrated in  FIG. 8 , since the ink from the exits of the individual supply flow paths  39  adjacent to each other flows out at once toward the first common flow path  40  side, in the region indicated by the broken line in  FIG. 8 , the pressure in the vicinity of the exit of each of the individual outlet flow paths  50  increases as though the supply port partition wall  38  were extended. Therefore, the ink flowing out from the exit of the individual supply flow path  39  to the first common flow path  40  side may not go toward a lateral direction, that is, toward the adjacent individual supply flow path  39  side, and accordingly the flow path resistance increases. As a result, there is a concern that the ejection characteristics such as the amount of ejected ink and the flight speed may vary depending on the number of nozzles  28  that eject simultaneously. In order to deal with such a problem, in the present embodiment, since the first compliance portion  42  is disposed within W 1  from the exit of the individual supply flow path  39  on the first common flow path  40  side, it is possible to reduce the variation in the ejection characteristics regardless of the number of nozzles  28  that perform the ejection simultaneously. 
     Next, the second compliance portion  43  will be described. As described above, the nozzle plate  20  is provided with the second compliance portion  43 . Similarly to the first compliance space  51 , the second compliance space  55  of the second compliance portion  43  is also open to the atmosphere through an atmosphere open path which is not illustrated. The second flexible portion  54  of the second compliance portion  43  partitions a portion of the second common flow path  41 . Similarly to the first compliance portion  42 , the flexible region of the second flexible portion  54  of the second compliance portion  43  is displaced from the initial state to the second compliance space  55  or the second common flow path  41  side in accordance with the pressure oscillation of the ink inside the second common flow path  41 . Accordingly, the pressure oscillation generated in the ink inside the ink flow paths, particularly the ink inside the second common flow path  41  in accordance with the recording operation of the recording head  10 , that is, the ink ejection operation, in other words, the residual oscillation after the ink ejection is alleviated. 
     As illustrated in  FIG. 5 , the second compliance portion  43  is formed to span from one end to the other end of the second common flow path  41  in the first direction X and is formed to span from the end on the opposite side to the supply port  44  in the second direction Y to a point slightly in front of the outlet flow path partition wall  53 . More specifically, setting the width of the individual outlet flow path  50  to W 2 , the edge of the flexible region of the second flexible portion  54  that is closest to the individual outlet flow path  50  in the second direction Y, in other words, the end on the individual outlet flow path  50  side in the second direction Y is disposed within W 2  from the exit of the individual outlet flow path  50  on the second common flow path  41  side. In the present embodiment, the end of the flexible region of the second compliance portion  43  is disposed within W 2  from the exit on the second common flow path  41  side of the individual outlet flow paths  50  other than the individual outlet flow paths  50   a  and  50   b  positioned at both ends in the first direction X of the second liquid chamber  37   b . The exit of the second common flow path  41  side is an opening of the individual outlet flow path  50  defined by the end of the outlet flow path partition wall  53  partitioning the individual outlet flow path  50  on the second common flow path  41  side. In this manner, by disposing the second compliance portion  43  as close as possible to the exit of the individual outlet flow path  50 , the pressure oscillation transmitted in the inner portion of the individual outlet flow path  50  is alleviated more quickly. In the present embodiment, the second compliance portion  43  is disposed at a position within W 2  from the exit of the individual outlet flow path  50  on the second common flow path  41  side and does not overlap each of the individual outlet flow paths  50  when viewed in the third direction Z. As a result, since the flexible region of the second compliance portion  43  and the supply port partition wall  38  defining the individual outlet flow path  50  do not interfere with each other, when the flexible region of the first compliance portion  42  is deformed, stress being focused on a portion in contact with the outlet flow path partition wall  53  and the second flexible portion  54  of the first compliance portion  42  being damaged originating at the same portion, variation in the flow path resistance in each of the individual outlet flow paths  50 , and the like are prevented. 
     In the recording head  10  of the configuration described above, the piezoelectric elements  31  are driven according to the drive signals from a control section, so that the pressure oscillation occurs in the ink inside the pressure chambers  30  and the pressure oscillation causes the ink to be ejected from the predetermined nozzles  28 . The first flexible portion  36  of the first compliance portion  42  on the outward path side of the ink flow path and the second flexible portion  54  of the second compliance portion  43  on the return path side of the ink flow path are respectively displaced in accordance with the pressure oscillation generated inside the ink flow path due to the liquid ejection operation of the recording head  10 , and so the pressure oscillation is absorbed. Accordingly, variation in the ejection characteristics caused by the pressure oscillation which is the residual oscillation after the ink ejection is suppressed. 
     In the recording head  10  according to the present disclosure, the first compliance portion  42  and the second compliance portion  43  are disposed to overlap each other when viewed in the thickness direction of the compliance portions  42  and  43 , that is, in the third direction Z in the present embodiment, in other words, to overlap each other. In the present embodiment, the third direction Z and the thickness direction of the nozzle plate  20  are parallel. In other words, in the present embodiment, the first compliance portion  42  and the second compliance portion  43  are disposed to overlap each other in the thickness direction of the nozzle plate  20 . That the first compliance portion  42  and the second compliance portion  43  “overlap” in the thickness direction of the nozzle plate  20  means that the first compliance portion  42  and the second compliance portion  43  face each other in the thickness direction of the nozzle plate  20 . That the first compliance portion  42  and the second compliance portion  43  “face each other” includes both a case in which is no other object is present between the first compliance portion  42  and the second compliance portion  43  and a case in which another object is present between the first compliance portion  42  and the second compliance portion  43 . That the first compliance portion  42  and the second compliance portion  43  “overlap” in the thickness direction of the nozzle plate  20  also means that, when the first compliance portion  42  and the second compliance portion  43  are projected onto a projection plane perpendicular to the thickness direction of the nozzle plate  20 , there is a region in which the first compliance portion  42  and the second compliance portion  43  overlap on the projection plane. Here, although the state in which the first compliance portion  42  and the second compliance portion  43  overlap each other includes a state in which the two partially overlap, a state in which greater than or equal to half of the area of each of the compliance portions  42  and  43  overlaps is more desirable. When the area of the first compliance portion  42  and the area of the second compliance portion  43  are the same, a state in which the entirety of the two overlap each other is more desirable. Alternatively, when one of the areas of the first compliance portion  42  and the second compliance portion  43  is smaller than the other area, a state in which the flexible region of the smaller is contained within the range of the flexible region of the larger, that is, a state in which one is contained in the other is more preferable. 
     In the present embodiment, the area of the second compliance portion  43  is set wider than the area of the first compliance portion  42  and each of the compliance portions  42  and  43  is disposed such that the flexible region of the first compliance portion  42  is contained within the range of the flexible region of the second compliance portion  43  when viewed in the third direction Z. In this manner, by setting the area of the flexible region of the second compliance portion  43  on the return path side of the compliance portions  42  and  43  to be larger, the compliance of the second compliance portion  43  is rendered larger than the compliance of the first compliance portion  42 . Compliance [m 3 /N] means the deformation amount per unit pressure. Here, in the configuration in which the ink circulates between the ink cartridge  13  and the recording head  10 , there is a case in which the pressure oscillation during the driving of the pump  14  which is the circulation mechanism, that is, a pulsation is superimposed on the pressure oscillation during the ink ejection and the pressure oscillation of the ink in the second common flow path  41  becomes large, and in such a case, the ink of the second common flow path  41  flows back to the pressure chamber  30  side through the individual outlet flow paths  50 , which there is a concern will cause the ejection characteristics to fluctuate from the target values. 
     In the present embodiment, by setting the compliance of the second compliance portion  43  on the return path side to be larger, even when the pressure oscillation during driving of the pump  14  is superimposed on the pressure oscillation during the ink ejection, it is possible to sufficiently reduce the oscillation using the second compliance portion  43  and the adverse effects on the ink ejection characteristics are more reliably suppressed. Note that the magnitude of the compliance in the compliance portion is not limited to the area of the flexible region, and may be adjusted by modifying the material or thickness of the flexible portion, for example. It is also possible to adopt a configuration in which the compliance of the first compliance portion  42  or the second compliance portion  43  closer to the nozzle  28  is larger than the compliance of the farther from the nozzle  28 . In the present embodiment, even from this perspective, the compliance of the second compliance portion  43  disposed at a position closer to the nozzle  28  is larger than the compliance of the first compliance portion  42 . According to this configuration, it is possible to more reliably reduce the pressure oscillation generated by the ink ejection in the nozzle  28  at a position closer to the nozzle  28 . Accordingly, fluctuations in the ink ejection characteristics from the nozzle  28  from the target values are more reliably suppressed. 
     As described above, according to the present disclosure, in the configuration in which ink is circulated between the ink cartridge  13  and the recording head  10 , even if the first common flow path  40  that configures the outward path from the ink cartridge  13  side to the pressure chamber  30  side and the second common flow path  41  that configures the return path from the pressure chamber  30  side returning to the ink cartridge  13  side are provided with the compliance portions  42  and  43 , respectively, it is possible to suppress an increase in size of the recording head  10 . Accordingly, this also contributes to reducing the size of the printer  1  equipped with the recording head  10 . Since the plurality of pressure chambers  30 , in other words, the first common flow path  40  and the second common flow path  41  shared by the plurality of nozzles  28  are provided with the compliance portions  42  and  43 , respectively, as compared to a configuration in which the individual flow paths, that is, the individual supply flow paths  39  and the individual outlet flow paths  50  are provided individually with compliance portions, respectively, it is possible to more efficiently suppress the pressure oscillation generated in accordance with the ink ejection operation in each of the pressure chambers  30 . Therefore, even when ink is ejected from each of the nozzles  28  at a higher drive frequency, since it is possible to more reliably suppress the pressure oscillations generated in accordance with the ejection operation, it is possible to handle the ink ejection at a higher drive frequency. 
     In the present embodiment, as illustrated in  FIG. 2 , since the pair of first common flow paths  40  are disposed between the pair of second common flow paths  41  in the second direction Y, which is the direction in which the nozzle groups are arranged and the nozzle groups are disposed between the first common flow paths  40 , it is possible to dispose the nozzle groups at a higher density. In the inner portion of the recording head  10 , it is possible to more efficiently lay out the ink flow paths including the common flow paths  40  and  41  and the pressure chambers  30  corresponding to each nozzle group, or the piezoelectric elements  31  and this contributes to reducing the size of the recording head  10 . In the second direction Y, since the second common flow path  41  is disposed on the outside of the first common flow path  40 , it is possible to secure a larger area of the second compliance portion  43  corresponding to the second common flow path  41 . 
       FIG. 9  is a sectional diagram illustrating the recording head  10  according to the second embodiment, and  FIG. 10  is a sectional diagram illustrating a modification example of the recording head  10  according to the second embodiment. In the present embodiment, the second communication plate  25  is provided with the first compliance portion  42  and the second compliance portion  43 . The first compliance portion  42  corresponding to the first common flow path  40 , similarly to the first embodiment, is provided in a region corresponding to the first common flow path  40  on the top surface side of the second communication plate  25 , more specifically, on the top surface side of the thin portion  52 . The first compliance portion  42  in the present embodiment is configured of the first flexible portion  36 , a first support plate  65  supporting the first flexible portion  36 , and the first compliance space  51 . The first support plate  65  is formed of a hard material such as stainless steel capable of supporting the first flexible portion  36 , for example. The first support plate  65  has a frame shape with a central portion penetrating in plan view in the third direction Z and the first flexible portion  36  is fixed to the frame-shaped portion. The first support plate  65  is fitted and bonded to the step provided in the opening portion of the first compliance space  51 . In other words, the first flexible portion  36  in the present embodiment is provided only in the portion corresponding to the first compliance portion  42 . 
     The second compliance portion  43  in the present embodiment is provided in a region corresponding to the second common flow path  41  on the bottom surface side of the thin portion  52  of the second communication plate  25 . The second compliance space  55  of the second compliance portion  43  is formed on the bottom surface side of the thin portion  52  with a dividing wall  67  interposed between the second compliance space  55  and the first compliance space  51  of the first compliance portion  42 . The second compliance portion  43  in the present embodiment is configured of the second flexible portion  54 , a second support plate  66  supporting the second flexible portion  54 , and the second compliance space  55 . In the same manner as the first support plate  65 , the second support plate  66  is formed in a frame shape from a hard material such as stainless steel and the second flexible portion  54  is fixed to the frame-shaped portion. The second support plate  66  is fitted and bonded to the step provided in the opening portion of the second compliance space  55 . In the present embodiment, although a configuration in which the first compliance space  51  and the second compliance space  55  are rendered separate spaces from each other by the dividing wall  67  is exemplified, for example, as illustrated in  FIG. 10 , it is also possible to adopt a configuration in which the dividing wall  67  is absent and both are connected in series. In other words, the first compliance portion  42  and the second compliance portion  43  may share one common compliance space  68 . The other configurations are similar to those of the first embodiment. 
       FIG. 11  is a sectional diagram of the recording head  10  according to the third embodiment. In each of the above embodiments, a configuration is exemplified in which the thickness direction of each of the compliance portions  42  and  43  is the laminating direction of the constituent members of the recording head  10 , that is, the third direction Z, but the present invention is not limited thereto. In the present embodiment, the first compliance portion  42  is provided on the wall surface of the inlet flow path  45  configuring the first common flow path  40  in the case  27  along the third direction Z. More specifically, an opening portion is provided in a defining wall  72  partitioning the inlet flow path  45  and the accommodation space portion  58  accommodating the actuator substrate  26 , and the first compliance portion  42  is provided so as to block the opening portion. The first compliance portion  42  is configured to use the accommodation space portion  58  as the first compliance space  51 . Therefore, it is not necessary to separately provide the first compliance space  51 , which contributes to reducing the size of the recording head  10 . The second compliance portion  43  is provided on the wall surface along the third direction Z of the outlet flow path  46  configuring the second common flow path  41  in the case  27 . More specifically, an opening portion communicating with the outlet flow path  46  is provided in an outer wall surface  73  on both sides of the case  27  in the second direction Y and the second compliance portion  43  is provided to block the opening portion. A protective plate  70  for protecting the second flexible portion  54  of the second compliance portion  43  is bonded to a portion of the outer wall surface  73  of the case  27  corresponding to the second compliance portion  43 . The space between the protective plate  70  and the second flexible portion  54  functions as the second compliance space  55 . In the present embodiment, the thickness direction of the compliance portions  42  and  43  is the second direction Y intersecting the first direction X which is the nozzle row direction. Even in the present embodiment, the first compliance portion  42  and the second compliance portion  43  are disposed to overlap each other when viewed in the thickness direction of the compliance portions  42  and  43 , that is, in the second direction Y in the present embodiment. Therefore, it is possible to reduce the size of the recording head  10 . 
     In the present embodiment, the supply port  44  is provided as a narrowed portion in which the flow path sectional area is set to be smaller than the flow path sectional area of the individual supply flow path  39  at the boundary portion between the first common flow path  40  extending in the third direction Z and the individual supply flow path  39  extending in the second direction Y. Accordingly, even if bubbles are mixed into the ink sent from the ink cartridge  13  side to the first common flow path  40 , the bubbles having a size that influences the ink ejection of from the nozzles  28  may not pass through the supply port  44  and are trapped. The bubbles that remain unable to pass through the supply port  44  float upstream of the first common flow path  40  due to buoyancy. Therefore, it is possible to more effectively suppress the adverse influence of such bubbles on the ink ejection. The other configurations are similar to those of the first embodiment. 
       FIG. 12  is a sectional diagram of the recording head  10  according to the fourth embodiment. In the present embodiment, the first compliance portion  42  is provided on the defining wall  72  partitioning the inlet flow path  45  and the accommodation space portion  58  accommodating the actuator substrate  26  in the case  27  in the same manner as in the third embodiment. On the other hand, the second compliance portion  43  is provided in a region of the nozzle plate  20  corresponding to the common outlet liquid chamber  48 . In the present embodiment, the thickness direction of the first compliance portion  42  is the second direction Y, whereas the thickness direction of the second compliance portion  43  is the third direction Z. In this configuration, the first compliance portion  42  and the second compliance portion  43  are disposed to overlap each other when viewed in the thickness direction of the second compliance portion  43 , that is, the third direction Z. In this manner, even in a configuration in which the compliance portions  42  and  43  overlap each other when viewed in the thickness direction of either the first compliance portion  42  or the second compliance portion  43 , it is possible to contribute to a reduction in the size of the recording head  10 . Further, regarding the second compliance portion  43  in the present embodiment, a recessed portion is formed leaving a thin portion functioning as the second flexible portion  54  from the bottom surface side of the nozzle plate  20  toward the top surface side and the second compliance space  55  is defined by the bottom surface side opening of the recessed portion being blocked by the fixed plate  23 . By partially reducing the thickness of the constituent members of the recording head  10  in this manner and causing the portion to function as the flexible portion, it is not necessary to separately provide the flexible portion. The other configurations are similar to those of the first embodiment. 
       FIG. 13  is a sectional diagram of the recording head  10  according to the fifth embodiment. In the present embodiment, the second compliance portion  43  is provided in a region of the nozzle plate  20  corresponding to the common outlet liquid chamber  48  in the same manner as in the first embodiment. On the other hand, the first compliance portion  42  is provided on the top surface side of the case  27  in the third direction Z. The inlet flow path  45  of the first common flow path  40  in the present embodiment is configured of the first inlet flow path  45   a  extending in a direction parallel to the top and bottom surfaces of the case  27  and the second inlet flow path  45   b  communicating with the first inlet flow path  45   a  extending along the third direction Z from the top surface side toward the bottom surface side of the case  27 . The first inlet flow path  45   a  is open in the top surface of the case  27  and the opening surface is sealed by the first support plate  65  of the first compliance portion  42 . One surface of the through hole provided in the first support plate  65 , that is, the surface on the first common flow path  40  side is sealed by the first flexible portion  36 , and the other surface, that is, the surface of the top surface side of the case  27  is sealed by the protective plate  70 , and thus, the first compliance space  51  is defined. An inlet  62  is formed at a position outside the first compliance space  51 , penetrating the first support plate  65  and the first flexible portion  36 . Even in the present embodiment, the first compliance portion  42  and the second compliance portion  43  are disposed to overlap each other when viewed in the thickness direction of the compliance portions  42  and  43 , that is, in the third direction Z in the present embodiment. Therefore, it is possible to reduce the size of the recording head  10 . The other configurations are similar to those of the first embodiment. 
     In addition, it is possible to apply the present disclosure to various configurations of liquid ejecting head and liquid ejecting apparatus provided with the liquid ejecting head where the liquid ejecting head is configured to include a flow path corresponding to an outward path and a flow path corresponding to a return path in which circulation of a liquid with a liquid storage portion is possible and a compliance portion is included in each of the outward path and the return path. For example, it is possible to apply the present disclosure to a liquid ejecting head and a liquid ejecting apparatus provided with the liquid ejecting head, where the liquid ejecting head is provided with a plurality of color material ejecting heads used in the manufacture of a color filter of a liquid crystal display or the like, electrode material ejecting heads used in electrode formation of an organic EL (Electro Luminescence) display, an FED (face emitting display), or the like, bioorganic material ejecting heads used in manufacturing biochips (biochemical elements), or the like. 
     REFERENCE SIGNS LIST 
     
         
         
           
               1  PRINTER 
               2  FRAME 
               3  PLATEN 
               4  GUIDE ROD 
               5  CARRIAGE 
               6  FLOW PATH MEMBER 
               10  RECORDING HEAD 
               13  INK CARTRIDGE 
               14  PUMP 
               15  INK SUPPLY TUBE 
               16  INK RECOVERY TUBE 
               20  NOZZLE PLATE 
               21  CAPPING MECHANISM 
               22  CAP 
               23  FIXED PLATE 
               24  FIRST COMMUNICATION PLATE 
               25  SECOND COMMUNICATION PLATE 
               26  ACTUATOR SUBSTRATE 
               27  CASE 
               28  NOZZLE 
               29  PRESSURE CHAMBER FORMING SUBSTRATE 
               30  PRESSURE CHAMBER 
               31  PIEZOELECTRIC ELEMENT 
               32  PROTECTIVE SUBSTRATE 
               33  OSCILLATING PLATE 
               34  FIRST NOZZLE COMMUNICATION PORT 
               35  SECOND NOZZLE COMMUNICATION PORT 
               36  FIRST FLEXIBLE PORTION 
               37  COMMON LIQUID CHAMBER 
               38  SUPPLY PORT PARTITION WALL 
               39  INDIVIDUAL SUPPLY FLOW PATH 
               40  FIRST COMMON FLOW PATH 
               41  SECOND COMMON FLOW PATH 
               42  FIRST COMPLIANCE PORTION 
               43  SECOND COMPLIANCE PORTION 
               44  SUPPLY PORT 
               45  INLET FLOW PATH 
               46  OUTLET FLOW PATH 
               47  THIN PORTION 
               48  COMMON OUTLET LIQUID CHAMBER 
               49  COMMUNICATION LIQUID CHAMBER 
               50  INDIVIDUAL OUTLET FLOW PATH 
               51  FIRST COMPLIANCE SPACE 
               52  THIN PORTION 
               53  OUTLET FLOW PATH PARTITION WALL 
               54  SECOND FLEXIBLE PORTION 
               55  SECOND COMPLIANCE SPACE 
               56  NARROWED PORTION 
               58  ACCOMMODATION SPACE PORTION 
               59  INSERTION SPACE PORTION 
               62  INLET 
               63  OUTLET 
               65  FIRST SUPPORT PLATE 
               66  SECOND SUPPORT PLATE 
               67  DIVIDING WALL 
               68  COMMON COMPLIANCE SPACE 
               70  PROTECTIVE PLATE 
               72  DEFINING WALL 
               73  OUTER WALL SURFACE