Patent Publication Number: US-9421766-B2

Title: Flow path member, liquid ejecting head, and liquid ejecting apparatus

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application claims priority to Japanese Patent Application No. 2014-042039 filed on Mar. 4, 2014, which is hereby incorporated by reference in its entirety. 
     TECHNICAL FIELD 
     The present invention relates to a flow path member for supplying liquid to a head main body of a liquid ejecting head which ejects liquid from nozzle openings, the liquid ejecting head including the flow path member, and a liquid ejecting apparatus. 
     RELATED ART 
     An ink jet recording head which is an example of a liquid ejecting head performs recording, or the like, on a medium such as paper using ink droplets by ejecting ink droplets from nozzle openings, by causing a pressure change in a pressure generation chamber which communicates with the nozzle openings. As such an ink jet recording head, a recording head in which a flow path member for supplying ink to a head main body including nozzle openings is provided in a valve unit (back-pressure control unit) has been proposed (for example, refer to JP-A-2012-206424). 
     Such a valve unit is configured so that a main body of a flow path member is held inside a cover. In addition, in the main body of the flow path member, a flow path is provided, and a pressure adjusting chamber and a valve which is open or closed due to a pressure change in the pressure adjusting chamber are provided in the middle of the flow path. In addition, a film holding unit which holds a film member demarcating the pressure adjusting chamber is open to the air through an atmosphere open path. In addition, in the atmosphere open path, a meandering path is covered using a sealing member, and the meandering path is sealed using the sealing member by interposing the sealing member with two cover members when the cover members are fastened (refer to JP-A-2012-206424). In addition, in a structure in JP-A-2012-206424, since the two cover members are fastened, and the main body of the flow path member in the inside is appropriately pressed, a first abutting unit is provided, and second abutting units are fastened until coming into contact with each other. 
     However, in the structure in JP-A-2012-206424, there is a problem in that a crushing amount of the sealing member which seals the meandering path becomes uneven, and due to excessive crushing, exudation (bleeding) of oil from the sealing member which is formed of rubber occurs, and the meandering path is blocked with the oil. 
     In addition, such a problem is not limited to an ink jet recording head, and also occurs in a liquid ejecting head which ejects liquid other than ink. 
     SUMMARY 
     An advantage of some aspects of the invention is to provide a flow path member in which excessive crushing is prevented by suppressing an uneven crushing amount of a sealing member which seals a meandering path, a liquid ejecting head, and a liquid ejecting apparatus. 
     According to an aspect of the invention, there is provided a flow path member which includes a cover which is divided into a base unit and a cover unit; flow path grooves which are provided on one side of facing faces of the cover unit and the base unit which face each other, are extended in a first direction in the facing faces, and are aligned in a second direction intersecting the first direction; an elastic sealing member which is arranged between the facing faces, and configures a part of a flow path wall face by covering the flow path grooves; and an abutting unit which is provided on one side of the facing faces of the base unit and the cover unit, protrudes toward the other side, and comes into contact with the other side on a face, in which the abutting units are provided on both sides of the flow path groove in any one direction of the first direction and the second direction, is extended along the other direction, and in which the base unit and the cover unit are fixed using a fastening member. 
     In this case, since the abutting units are provided on facing faces of both sides of the flow path groove, a degree of fastening using the fastening member becomes uniform, and it is possible to reduce unevenness of a crushing amount of the sealing member. 
     In the flow path member, it is preferable that the flow path groove be provided in a region which is surrounded with a first side in the first direction, and a second side in the second direction which is longer than the first side, and the abutting units be provided on both sides in a direction to which the second side is extended. In this case, the crushing amount of the sealing member with respect to the entire flow path groove becomes more uniform. 
     In the flow path member, it is preferable that the abutting unit be extended to the same dimension as at least a dimension of extending or aligning the flow path groove. In this case, the crushing amount of the sealing member with respect to the entire flow path groove becomes more uniform. 
     In the flow path member, it is preferable that a main body of the flow path member which has a layered structure in which flow paths of liquid are formed inside the cover be provided, and the main body of the flow path member include at least one back-pressure control unit. In this case, it is possible to perform atmosphere opening of the back-pressure control unit to the atmospheric pressure side through the flow path groove. 
     In the flow path member, it is preferable that a second abutting unit which comes into contact with other side on a face by protruding towards the other side be provided on one side of facing faces of the cover unit and the base unit which face each other corresponding to a portion at which the fastening member is provided. In this case, it is possible to control a fastening amount of the fastening member in a second abutting unit, and the crushing amount of the sealing member with respect to the entire flow path groove becomes more uniform. 
     According to another aspect of the invention, there is provided a liquid ejecting head which includes the flow path member. In this case, an abutting unit is provided on facing faces on both sides of a flow path groove, a degree of fastening using a fastening member becomes uniform, and it is possible to realize a liquid ejecting head which includes a flow path member in which unevenness of a crushing amount of a sealing member is reduced. 
     According to still another aspect of the invention, there is provided a liquid ejecting apparatus which includes the liquid ejecting head. In this case, an abutting unit is provided on facing faces on both sides of a flow path groove, degree of fastening using a fastening member becomes uniform, and it is possible to realize a liquid ejecting apparatus which includes a flow path member in which unevenness of a crushing amount of a sealing member is reduced. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements. 
         FIG. 1  is an exploded perspective view of a recording head according to a first embodiment of the invention. 
         FIG. 2  is an exploded perspective view of a first main body of a flow path member according to the first embodiment. 
         FIGS. 3A and 3B  are exploded perspective views of a second main body of the flow path member according to the first embodiment. 
         FIG. 4  is a schematic cross-sectional view of the flow path member according to the first embodiment. 
         FIGS. 5A and 5B  are a plan view and a rear view of a base unit of the flow path member according to the first embodiment. 
         FIGS. 6A and 6B  are a plan view and a rear view of a cover unit of the flow path member according to the first embodiment. 
         FIG. 7  is an exploded perspective view of the flow path member according to the first embodiment. 
         FIGS. 8A and 8B  are a plan view and a cross-sectional view of a downstream filter chamber according to the first embodiment. 
         FIGS. 9A and 9B  are diagrams which describe an effect of the invention. 
         FIGS. 10A to 10C  are diagrams which describe modification examples of the invention. 
         FIGS. 11A to 11C  are diagrams which schematically illustrate positional relationship in abutting units according to the first embodiment and modification examples. 
         FIG. 12  is an enlarged view of  FIG. 6B . 
         FIGS. 13A and 13B  are diagrams which describe a crushing amount of a sealing unit. 
         FIG. 14  is a cross-sectional view in the vicinity of a second abutting unit. 
         FIG. 15  is an exploded perspective view which illustrates an example of a head main body according to the first embodiment. 
         FIG. 16  is a plan view which is viewed from a liquid ejecting face side of the head main body according to the first embodiment. 
         FIG. 17  is a cross-sectional view which is taken along line XVII-XVII in  FIG. 16 . 
         FIG. 18  is a schematic view which illustrates a liquid ejecting apparatus according to the embodiment of the invention. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Hereinafter, the invention will be described in detail based on embodiments. 
     First Embodiment 
       FIG. 1  is an exploded perspective view of an ink jet recording head which is an example of a liquid ejecting head according to a first embodiment of the invention,  FIG. 2  is an exploded perspective view of a first main body of a main body of a flow path member,  FIGS. 3A and 3B  are an exploded perspective view and a perspective view of a main portion of a second main body of the main body of the flow path member,  FIG. 4  is a cross-sectional view which schematically illustrates a cross section of the flow path member,  FIGS. 5A and 5B  are a plan view and a rear view of a base unit,  FIGS. 6A and 6B  are a plan view and a rear view of a cover unit, and  FIG. 7  is an exploded perspective view of the flow path member. 
     As illustrated in  FIG. 1 , an ink jet recording head  1000  which is an example of a liquid ejecting head according to the first embodiment of the invention includes a back-pressure control unit  1020  which is a flow path member, a circuit board  1070  which is provided on a base of the back-pressure control unit  1020 , a head case  1080  which is provided on the side opposite to the back-pressure control unit  1020  of the circuit board  1070 , and a head main body  210  which is fixed to the head case  1080 . 
     The back-pressure control unit  1020  is a flow path member which supplies ink from a liquid storage unit such as an ink tank in which external ink is stored to the head main body  210 . 
     Here, the back-pressure control unit  1020  will be described in detail. The back-pressure control unit  1020  includes a cover  1030  which is formed of a hollow box-shaped member, and a main body of the flow path member  1040  which is provided inside the cover  1030 . 
     The cover  1030  includes a base unit  1031  and a cover unit  1032  which are vertically separated. The base unit  1031  includes a first holding unit  1311  which has a concave shape which opens to the cover unit  1032  side. 
     In addition, a plurality of supply ports  1312  which supply ink to the head main body  210  by penetrating the head main body in the thickness direction are provided on a base of the first holding unit  1311  of the base unit  1031 . According to the embodiment, eight supply ports  1312  are provided on the base of the base unit  1031  (refer to  FIGS. 5A and 5B ). 
     As illustrated in  FIGS. 1, 2 and 4 , the cover unit  1032  is formed in a size which covers the first holding unit  1311  of the base unit  1031 , and includes a concave-shaped second holding unit  1321  which is open to the base unit  1031  side by facing the first holding unit  1311  of the base unit  1031 . 
     In addition, when the base unit  1031  and the cover unit  1032  cause the first holding unit  1311  and the second holding unit  1321  to be fixed by facing each other, a holding unit  1033  which is a space demarcated by the first holding unit  1311  and the second holding unit  1321  is formed inside the cover unit  1032 . 
     Here, a first wall portion  1315  which demarcates a side face of the first holding unit  1311  is provided in the base unit  1031 , as illustrated in  FIGS. 4 to 6B . In addition, a second wall portion  1322  which demarcates a side face of the second holding unit  1321  is provided in the cover unit  1032 . In addition, the base unit  1031  and the cover unit  1032  are fixed by causing a tip end face of the first wall portion  1315  and a tip end face of the second wall portion  1322  to come into contact with each other through a first sealing portion  1034 . That is, the first sealing portion  1034  which is formed of rubber, elastoma, or the like, is interposed between the first wall portion  1315  and the second wall portion  1322 . As a matter of course, the first sealing portion  1034  may be a bonding portion using heat welding or an adhesive. In addition, the base unit  1031  and the cover unit  1032  are fixed when a fastening member  1037  such as a screw, which is illustrated in  FIG. 1 , is inserted thereto from the cover unit  1032  side, and by screwing the fastening member  1037  to the base unit  1031 . 
     As illustrated in  FIGS. 1 to 7 , according to the embodiment, the main body of the flow path member  1040  which is held by the holding unit  1033  of the cover  1030  includes a first main body  1040 A which is configured by stacking a first flow path member  1041  which is provided on the cover  1030  side, a second flow path member  1042  which is provided on the base unit  1031  side of the first flow path member  1041 , a third flow path member  1043  which is provided on the base unit  1031  side of the second flow path member  1042 , and a fourth flow path member  1044  (which is provided on the base unit  1031  side of the second flow path member  1042 ). In addition, the main body of the flow path member includes a second main body  1040 B which is configured of a fifth flow path member  1045  which is attached to the base unit  1031 , and a sixth flow path member  1046  which is provided between the fifth flow path member  1045  and the base unit  1031  (refer to  FIGS. 3A and 3B ). 
     The respective first flow path member  1041 , the second flow path member  1042 , the third flow path member  1043 , the fourth flow path member  1044 , the fifth flow path member  1045 , and the sixth flow path member  1046  are formed of a plate-shaped member which is configured of a resin material, a metallic material, or the like. In addition, the fifth flow path member  1045  and the sixth flow path member  1046  are attached to the base unit  1031 , and the first main body  1040 A which is configured of the first flow path member  1041 , the second flow path member  1042 , the third flow path member  1043 , and the fourth flow path member  1044  is held in the holding unit  1033  of the cover  1030  in the stacked state. In addition, according to the embodiment, the first flow path member  1041 , the second flow path member  1042 , the third flow path member  1043 , and the fourth flow path member  1044  are bonded to each other using an adhesive. 
     In the main body of the flow path member  1040  which is formed of the first main body  1040 A configured of the first flow path member  1041 , the second flow path member  1042 , the third flow path member  1043 , and the fourth flow path member  1044 , and the second main body  1040 B which is configured of the fifth flow path member  1045  and the sixth flow path member  1046 , a liquid flow path which supplies ink from a liquid storage unit in which external ink is stored to the head main body  210  is provided. 
     Specifically, as illustrated in  FIG. 2 , the first main body  1040 A includes an introduction path  1052  which has a connection port  1051  to which the other end portion of a supply tube (not illustrated) which is a tubular member such as a tube of which one end side is connected to the liquid storage unit is connected, a filtering chamber for introduction  1053  which eliminates dust or foreign substances such as air bubbles which are contained in liquid from the introduction path  1052 , a pressure adjusting chamber  1054  which is a liquid chamber to which liquid which passes through the introduction filter chamber  1053  is supplied, an outflow path  1055  through which liquid in the pressure adjusting chamber  1054  is flown out to the head side, and an outflow port  1056  which flows out the liquid on the outflow path  1055 . 
     Meanwhile, the second main body  1040 B includes a second introduction path  1057  which communicates with the outflow path  1055 , a filtering chamber  1058  for filtering liquid which is introduced from the second introduction path  1057 , and a supply path  1059  which supplies liquid from the filtering chamber  1058  to the head main body  210 . 
     Here, the connection port  1051  is provided on a top face of the third flow path member  1043  by opening into the inside of an opening portion  1323  of the cover unit  1032 . A plurality of the connection ports  1051  are provided corresponding to a plurality of inks. According to the embodiment, four connection ports  1051  are provided (refer to  FIGS. 1 and 2 ). 
     The introduction path  1052  including such connection ports  1051  is configured of a flow path which penetrates the third flow path member  1043  or the fourth flow path member  1044 , a flow path between the second flow path member  1042  and the first flow path member  1041 , a flow path between the third flow path member  1043  and the fourth flow path member  1044 , and the like. 
     Here, the filtering chamber for introduction  1053  which is provided on the introducing path  1052  which has the connection port  1051  includes a filter member  1531  which is interposed between the third flow path member  1043  and the fourth flow path member  1044 , a filtering chamber  1532  on the upstream side, and a filtering chamber  1533  on the downstream side, and the filtering chamber  1533  on the downstream side communicates with the pressure adjusting chamber  1054 . 
     Incidentally, according to the embodiment, as illustrated in  FIGS. 2 to 3B , four connection ports  1051  are provided, four introduction paths  1052  are provided corresponding to the four connection ports  1051 , and the filtering chamber for introductions  1053 , and four pressure adjusting chambers  1054  are also provided, respectively. 
     The pressure adjusting chamber  1054  has a concave shape which is open to the first flow path member  1041  side of the second flow path member  1042  which is a plate-shaped member. In addition, the pressure adjusting chamber  1054  communicates with the introduction path  1052  on the base on one end portion side in a direction orthogonal to the aligning direction, and communicates with the filtering chamber  1058  through the outflow port  1056  which is provided on the base on the other end side. 
     Here, the outflow path  1055  is formed inside a connection portion  1431  which is provided in a protruding manner in the concave portion on the base of the third flow path member  1043 , and a connection portion  1561  is fitted into a bush  1562  which is formed of an elastic member such as rubber. The bush  1562  is held by an opening portion  1563  of the fourth flow path member  1044 , and a through hole  1564  which penetrates the third flow path member  1043  communicates with the base unit of the opening portion  1563 . A connection portion  1565  in which a second introduction path  1057  is formed is inserted into the through hole  1564 , and a tip end portion of the connection portion  1565  is fitted into the bush  1562 , and the connection portion is connected to the connection portion  1561  through the bush  1562 . 
     The pressure adjusting chamber  1054  is sealed using a film member  1047  which is provided on an opening face of the second flow path member  1042 . Here, the film member  1047  is a flexible thin film, and is fixed onto the surface of the second flow path member  1042  using heat welding, or the like. In addition, the film member  1047  is subjected to pressure forming so as to be in a bent state in a dome shape in the pressure adjusting chamber  1054 . 
     In addition, an elastic plate  1048  which is arranged on the film member  1047  side is provided in the pressure adjusting chamber  1054  of the second flow path member  1042 . The elastic plate  1048  is provided in the pressure adjusting chamber  1054  in a protruding manner in a state in which one end portion side is fixed onto the surface side of the second flow path member  1042 , and a tip end thereof becomes a free end in the pressure adjusting chamber  1054 . According to the embodiment, as illustrated in  FIG. 2 , the elastic plate  1048  is formed so as to have a so-called comb-tooth shape which is configured of a common portion  1048   a  which is shared by a plurality of the elastic plates  1048  on a fixing end side, and an elastic unit  1048   c  which is divided using a slit  1048   b  which protrudes inside the pressure adjusting chamber  1054 . 
     The elastic plate  1048  is fixed when the common portion  1048   a  is held on the opening face side of the pressure adjusting chamber  1054 . In addition, as the elastic plate  1048 , a plate-shaped member which is elastic and is ink-resisting may be used, and according to the embodiment, a stainless steel plate is used. 
     In addition, as illustrated in  FIGS. 2 to 4 , a valve  1100  which opens or closes a communication state between the introduction path  1052  and the pressure adjusting chamber  1054  is provided therebetween. The valve  1100  configures the back-pressure control unit along with the pressure adjusting chamber  1054 . 
     Specifically, the valve  1100  is provided in a cylindrical case unit  1101  which is provided in a protruding manner on the surface of the third flow path member  1043 , and a top face of the case unit  1101  comes into contact with the base of the second flow path member  1042 . In addition, the inside of the case unit  1101  communicates with the filtering chamber  1533  on the downstream side, and the pressure adjusting chamber  1054 . 
     In addition, the valve  1100  which is provided in the case unit  1101  includes a columnar shaft portion  1104  which is inserted into an insertion hole  1103  which communicates with the inside of the case unit  1101  and the pressure adjusting chamber  1054 , and a disk-shaped flange portion  1105  of which an outer diameter is larger than that of the shaft portion  1104 , which is provided at a lower end portion of the shaft portion  1104  in the case unit  1101 . A lower end of the shaft portion  1104  is connected to a center on a top face of the flange portion  1105 , and a higher end of the shaft portion  1104  comes into contact with a lower face (face on pressure adjusting chamber  1054  side) of the elastic plate  1048 . 
     The outer diameter of the flange portion  1105  is larger than the inner diameter of the insertion hole  1103 , and is slightly smaller than the inner diameter of the case unit  1101 . In addition, a coil spring  1106  which is an example of an urging member is installed between a lower face of the flange portion  1105  (face on third flow path member  1043  side) and a top face of the third flow path member  1043 . 
     The coil spring  1106  is set so as to urge the valve  1100  upward which is a direction in which the valve is usually in a closed state (film member  1047  side). In addition, the closed state of the valve  1100  is a state in which the flange portion  1105  comes into close contact with the base of the second flow path member  1042 , and the insertion hole  1103  is closed, that is, a non-communication state. 
     In addition, when a pressure in the inside of the pressure adjusting chamber  1054  becomes negative due to supplying of ink to the head main body  210 , the film member  1047  is displaced so as to bend on the pressure adjusting chamber  1054  side (third flow path member  1043  side) due to a pressure difference from atmospheric pressure in the film holding unit  1060 . The elastic unit  1048   c  (refer to  FIG. 2 ) of the elastic plate  1048  is subjected to elastic deformation so as to bend toward the third flow path member  1043  side along with the displacement of the film member  1047 . 
     When the shaft portion  1104  pushes the valve  1100  down to the third flow path member  1043  side against an urging force of the coil spring  1106 , due to the elastic deformation of the elastic plate  1048 , the flange portion  1105  secedes from a wall face to which the insertion hole  1103  opens, and the pressure adjusting chamber  1054  and the introduction path  1052  communicate with each other. 
     In this manner, when the pressure adjusting chamber  1054  and the introduction path  1052  communicate with each other, ink on the introduction path  1052  flows into the pressure adjusting chamber  1054 . In addition, when liquid is sufficiently filled in the pressure adjusting chamber  1054  and the supply path  1059 , the negative pressure in the pressure adjusting chamber  1054  is eliminated, the elastic plate  1048  returns to the original state, and a pressure in the inside of each of the pressure adjusting chambers  1054  is usually maintained so as to be constant when each of valves  1100  is respectively closed due to the urging force of each of the coil springs  1106 . 
     In addition, the first flow path member  1041  which seals the pressure adjusting chamber  1054  which is provided in the second flow path member  1042  includes the concave-shaped film holding unit  1060  which is a space for allowing deformation of the film member  1047  by facing each pressure adjusting chamber  1054  on a face on the second flow path member  1042  side. In addition, the first flow path member  1041  includes a through hole  1611  which is penetrating in the thickness direction which is open into the film holding unit  1060 , and opens the inside of the film holding unit  1060  to the atmosphere in the cover  1030 . 
     Meanwhile, as illustrated in  FIGS. 3A and 3B , four filtering chambers  1058  which are provided in the second main body  1040 B which is configured of the fifth flow path member  1045  and the sixth flow path member  1046 , and respectively include a filtering member  1581  which is interposed between the fifth flow path member  1045  and the sixth flow path member  1046 , the upstream filtering chamber  1582  which is provided in the fifth flow path member  1045 , and a downstream filtering chamber  1583  which is provided in the sixth flow path member  1046 . Here, the fifth flow path member  1045  which demarcates the upstream filtering chamber  1582 , and the sixth flow path member  1046  which demarcates the downstream filtering chamber  1583  configure a filter support member. 
     Here,  FIGS. 8A and 8B  illustrate a planar view and a cross-sectional view of the downstream filtering chamber  1583 . As illustrated, the downstream side of the downstream filtering chamber  1583  is branched off into at least two. According to the embodiment, one downstream filtering chamber  1583  is provided with two liquid storage units  1583   a  and  1583   b  which communicate with each other by being located on the lower side of the filter member  1581 , and communication holes  1601  are respectively provided at the lowest portions on the bases of each of the liquid storage units  1583   a  and  1583   b  which are inclined. Accordingly, two communication holes  1601  are provided in each of the downstream filtering chambers  1583 , and eight communication holes  1601  in total are provided in four downstream filtering chambers  1583 . In addition, the eight communication holes  1601  respectively communicate with eight supply paths  1059 , and respectively communicate with eight planar flow paths  1313  which respectively communicate with eight supply ports  1312  which are provided on the base of the base unit  1031  through the supply path  1059  (refer to  FIGS. 3A to 5B ). As a matter of course, the plurality of communication holes  1601  and supply paths  1059  may be provided by respectively corresponding to the eight supply ports  1312 . 
     In addition, when it is described in detail, the liquid storage units  1583   a  and  1583   b  of the downstream filtering chamber  1583  are open toward the upstream filtering chamber  1582 , and a peripheral edge portion of the filter member  1581  is fixed to a step portion which is provided in the sixth flow path member  1046  at the periphery of the liquid storage units  1583   a  and  1583   b . A method of fixing the filter member  1581  to the step portion is not particularly limited, and for example, there is welding such as heat welding or ultrasonic welding, bonding using an adhesive, or the like. According to the embodiment, the filter member  1581  is fixed onto a filter attaching face by providing a director  1583   e  which protrudes to the filter attaching face, melting the director  1583   e  using heat, ultrasonic waves, or the like, in a state of pressing the filter member  1581  toward the director  1583   e , and solidifying the director  1583   e . In addition, since the director  1583   e  spreads in a micropore of the filter member  1581  and on a face on the sixth flow path member  1046  side after being melted, in  FIGS. 8A and 8B , the director  1583   e  before being melted is denoted by a dotted line. 
     The filter member  1581  is a member for eliminating foreign substances such as dusts or air bubbles which are contained in ink as liquid, and for example, it is possible to use a sheet-like member in which a plurality of micropores are formed by finely knitting a fiber such as a metallic fiber or a resin fiber, a plate-shaped member which is formed of metal, a resin, or the like, on which a plurality of micropores are formed, or the like. In addition, the filter member  1581  may be formed of a non-woven fabric, and a material thereof is not particularly limited. 
     Here, as illustrated in  FIGS. 8A and 8B , the filter member  1581  has a longitudinal direction L and a transverse direction S, and forms a region which faces the liquid storage units  1583   a  and  1583   b . Meanwhile, dimensions of both opening portions of the liquid storage units  1583   a  and  1583   b  are slightly smaller than the dimensions of the filter member  1581  in the longitudinal direction L and the transverse direction S, respective bases of the opening portions are high at the peripheral portions, and the opening portions are formed as inclined faces which are inclined so as to be low toward the communication hole  1601 . In addition, a ridge  1583   c  is formed between the liquid storage units  1583   a  and  1583   b . The ridge  1583   c  is lower than the peripheral portions of the liquid storage units  1583   a  and  1583   b , and is elevated toward the filter member  1581  between two communication holes  1601 , though the ridge does not come into contact with the filter member  1581 . 
     On the bases of the liquid storage units  1583   a  and  1583   b , base end portions are fixed, and a column-shaped rib  1583   d  of which a tip end is provided toward a filter  216  side, that is, in a protruding manner in a linear shape in the third direction Z is provided. According to the embodiment, two ribs  1583   d  are provided on an inclined face on the left side of the communication hole  1601  on the left side, on the ridge  1583   c , and between the ridge  1583   c  and the communication hole  1601  on the right side, respectively, and support the filter member  1581 . 
     As described above, liquid which is introduced from one pressure adjusting chamber  1054  enters one upstream filtering chamber  1582  through the second introduction path  1057 , enters one downstream filtering chamber  1583  by being filtered using one filter member  1581 , and is branched off into two supply paths  1059  through the two communication holes  1601  which are provided on the base. 
     In addition, according to the embodiment, liquid from four pressure adjusting chambers  1054  corresponds to any one of black Bk, magenta M, cyan C, and yellow Y, and the four communication holes  1601  are branched off into two supply paths  1059  of each color, respectively, through the downstream filtering chamber  1058 . 
     Meanwhile, as illustrated in  FIGS. 5A and 5B , eight planar flow paths  1313  are arranged in the base unit  1031 , and each planar flow path  1313  communicates with a supply port  1312  which penetrates the flow path to the rear face. Here, the eight planar flow paths  1313  are formed of two planar flow paths  1313 Bk corresponding to black Bk, two planar flow paths  1313 M corresponding to magenta M, two planar flow paths  1313 C corresponding to cyan C, and two planar flow paths  1313 Y corresponding to yellow Y, and the two planar flow paths  1313 Bk communicate with supply paths  1312 Bk, respectively, the two planar flow paths  1313 M communicate with supply paths  1312 M, respectively, the two planar flow paths  1313 C communicate with supply paths  1312 C, respectively, and the two planar flow paths  1313 Y communicate with supply paths  1312 Y, respectively. 
     In this manner, according to the embodiment, four types of liquid which are introduced from four connection ports  1051 , that is, black Bk, magenta M, cyan C, and yellow Y are introduced to four filtering chambers  1058  through four pressure adjusting chambers  1054 , respectively, are branched off into two in respective downstream filtering chambers  1583 , and are supplied to the head main body  210  from the eight supply ports  1312 . In addition, according to the embodiment, four head main bodies  210  are provided, and each head main body  210  includes two nozzle columns, respectively, and liquid from the eight supply ports  1312  is supplied to one nozzle column. 
     In this manner, according to the embodiment, the downstream filtering chamber  1583  communicates with two branching flow paths  1593  and  1596 , and is branched off into two. In this manner, it is possible to share two nozzle columns in one pressure adjusting chamber  1054  which supplies liquid of one type, to miniaturize the member, and to reduce cost. 
     In addition, by sharing one filter member  1581  in two nozzle columns, it is also possible to miniaturize the member, and to reduce costs due to this. 
     When comparing a case in which one filter member  1581  is provided with respect to two flow paths, as illustrated in  FIGS. 8A and 8B , with a case in which the filter members  1581   a  and  1581   b  are provided in each flow path, as illustrated in  FIGS. 9A and 9B , in a case in which the filter members  1581   a  and  1581   b  are provided, a partitioning wall  1581   c  is present between both, and welding portions  1581   d  and  1581   e  are present on both sides of the partitioning wall  1581   c . Accordingly, when one filter member  1581  is used, it is possible to reduce a space by a total dimension which is obtained by totaling a dimension L 1  of the partitioning wall  1581   c , and dimensions L 2  and L 3  of the welding portions  1581   d  and  1581   e.    
     According to the embodiment, as illustrated in  FIG. 10A , it is set such that two branching flow paths  1002  communicate with one filtering chamber  1001  on the downstream side, one upstream flow path  1003  is provided, and a back-pressure control unit  1004  is installed here; however, when two or more branching flow paths  1002  are provided on the downstream side of the filtering chamber  1001 , it is not limited to this. For example, as illustrated in  FIG. 10B , it may be a configuration in which two upstream flow paths  1003  are provided, and the back-pressure control unit  1004  is installed, respectively, and may be a configuration in which three branching flow paths  1002  communicate with the filtering chamber  1001  on the downstream side, as illustrated in  FIG. 10C . 
     In addition, atmosphere opening path  1062  which opens atmosphere in the cover  1030  to atmosphere is provided in the back-pressure control unit  1020 . 
     Here, the atmosphere opening path  1062  will be described in detail with reference to  FIGS. 3A, 3B, 6A, 6B, 7, and 11A to 14 . In addition,  FIGS. 11A to 11C  are diagrams which schematically illustrate a positional relationship between abutting units in the first embodiment and a modification example,  FIG. 12  is an enlarged view of  FIG. 6B ,  FIGS. 13A and 13B  are diagrams which describe a crushing amount of a sealing unit, and  FIG. 14  is a cross-sectional view in the vicinity of the second abutting unit. 
     The atmosphere opening path  1062  is configured of a meandering path  1621  which is formed of meandering grooves which are provided on a face facing the cover unit  1032  of the base unit  1031 . 
     In the meandering path  1621 , one end portion  1621   a  communicates with atmosphere in the cover  1030 , the other end portion  1621   b  communicates with the outside, and the meandering path is formed of grooves which have concave shapes meandering toward the second direction Y while reciprocating in the first direction X. A narrow communication path for communication with the outside is formed by sealing the meandering path  1621  using a sealing member. 
     In this manner, it is possible to deform the film member  1047  using a pressure difference between a pressure in the pressure adjusting chamber  1054  and an atmospheric pressure, by opening the film holding unit  1060  on the side opposite to the pressure adjusting chamber  1054  of the film member  1047  to atmosphere using the atmosphere opening path  1062 . 
     In addition, by configuring the atmosphere opening path  1062  using the meandering path  1621 , it is possible to form the atmosphere opening path  1062  long with a small cross-sectional area. In this manner, it is possible to suppress moisture evaporation from the film member  1047  by providing diffusion resistance to the atmosphere opening path  1062 . Incidentally, since moisture of ink which is poured into the pressure adjusting chamber  1054  penetrates the film member  1047 , when the atmosphere opening path to which diffusive resistance is not given is provided, moisture which has penetrated the film member  1047  is easily evaporated, and there is a problem in that viscosity of ink increases, or the like. According to the embodiment, since evaporation of moisture of ink which penetrates the film member  1047  is suppressed, it is possible to suppress the problem in which viscosity of ink increases, or the like. 
     Here, as illustrated in  FIG. 12 , in the cover unit  1032 , a first sealing unit  1034 , a second sealing unit  1035 , and a third sealing unit  1036  which are formed of rubber, elastoma, or the like, are provided in a state of being separated from each other. 
     As described above, the first sealing unit  1034  is provided over a tip end face of a second wall portion  1322  of the cover unit  1032 , and suppresses outflow of ink in the holding unit  1033  of the cover  1030  to the outside by sealing a joint at the outer periphery of the base unit  1031  and the cover unit  1032  using the first sealing unit  1034 . 
     The second sealing unit  1035  is provided at a position facing the meandering path  1621  of the cover unit  1032  (refer to  FIGS. 3A and 3B ), and seals an opening of the meandering path  1621  on the cover unit  1032  side. 
     The third sealing unit  1036  is provided over the periphery of the opening portion  1323  on a face of a protrusion portion  1324  on the first flow path member  1041  side, in which the above described opening portion  1323  is provided. The third sealing unit  1036  seals a gap between the connection port  1051  of the main body of the flow path member  1040  and the cover unit  1032  at the periphery of the connection port. When the third sealing unit  1036  is fixed to the opening portion  1323 , it is possible to prevent ink which is leaked when attaching or detaching a supply tube which is connected to the connection port  1051 , or the like, from flowing into the holding unit  1033 , and to prevent ink in the holding unit  1033  from leaking from an interval with the cover unit  1032  at the periphery of the connection port  1051 . 
     The first sealing unit  1034 , the second sealing unit  1035 , and the third sealing unit  1036  are provided in the cover unit  1032  at positions of which height is different, respectively. Specifically, the first sealing unit  1034  is provided on a tip end face of the second wall portion  1322  of the cover unit  1032 , as described above. In addition, the second sealing unit  1035  is provided on a face facing the base portion  1031  of the cover unit  1032 . In addition, the third sealing unit  1036  is provided on a tip end face of a protrusion portion  1324  which protrudes so as to be lower than the second wall portion  1322  of the cover unit  1032 . 
     In addition, the first sealing unit  1034 , the second sealing unit  1035 , and the third sealing unit  1036  are integrally formed using a two-color molding method along with the cover unit  1032 . According to the embodiment, both are integrally formed by molding a rubber material at a predetermined position of the cover unit  1032  after forming the cover unit  1032  by molding a resin material. 
     In this manner, it is not necessary to perform positioning of the first sealing unit  1034 , the second sealing unit  1035 , and the third sealing unit  1036  by integrally forming the cover unit  1032 , and the first sealing unit  1034 , the second sealing unit  1035 , and the third sealing unit  1036  using the two-color molding method, and it is possible to reduce costs by simplifying an assembling operation of the back-pressure control unit  1020 . In particular, as in the embodiment, it is possible to simplify the assembling operation, since it is not necessary to perform the positioning operation when providing the first sealing unit  1034 , the second sealing unit  1035 , and the third sealing unit  1036  in the cover unit  1032  at positions of which height is different, and to suppress leaking of ink due to position shifts of the first sealing unit  1034 , the second sealing unit  1035 , and the third sealing unit  1036 . 
     In addition, by integrally forming the cover unit  1032 , and the first sealing unit  1034 , the second sealing unit  1035 , and the third sealing unit  1036  using the two-color molding method, it is possible to reduce the number of components, and manufacturing costs and assembling costs, compared to a case in which a separate plate-shaped sealing member is used. 
     In addition, as illustrated in  FIGS. 1 to 7 , the base unit  1031  and the cover unit  1032  are fixed in a state of being integrated by screwing a tip end of the fastening member  1037  (refer to  FIG. 1 ) such as a screw which is inserted into a through hole for fastening  1325  of the cover unit  1032  to a fixing hole  1316 . 
     Here, in the invention, since it is controlled so that there is no unevenness in crushing amount of the first sealing unit  1034 , the second sealing unit  1035 , and the third sealing unit  1036 , by controlling a fastening amount of the fastening member  1037 , the crushing amount of the first sealing unit  1034 , the second sealing unit  1035 , and the third sealing unit  1036  are set so as to be uniform, by precisely controlling the height of the abutting unit by providing the abutting unit on any one side of facing faces of the base unit  1031  and the cover unit  1032  by facing each other. 
     First, in order to reduce unevenness of the crushing amount of the second sealing unit  1035  which covers the meandering path  1621  which configures the atmosphere opening path  1062 , as schematically illustrated in  FIG. 11A , a first abutting unit  1326  is provided on both sides of the meandering path  1621  in the second direction Y, which is formed of grooves (corresponding to flow path groove in invention) which have concave shapes meandering toward the second direction Y while reciprocating in the first direction X. In practice, as illustrated in  FIG. 12 , the first abutting unit  1326  extends along the first direction X on both sides of the second sealing unit  1035  of the cover unit  1032  in the second direction Y. The length of the first abutting unit  1326  in the extending direction is the same as the dimension L 1  of the meandering path  1621  in the first direction X. However, the length of the first abutting unit  1326  on the left side in  FIGS. 11A to 11C  is smaller than the extended dimension L 1  of the meandering path  1621  in the first direction X by being interfered with an ear portion  1035   a  of the second sealing unit  1035 , but the interfered portion is also included similarly to the dimension L 1  in the first direction X of the meandering path  1621 . In addition, in this case, as illustrated in  FIG. 11B , a first abutting unit  1326   a  may be provided on the outer side of the ear portion  1035   a  of the second sealing unit  1035 . In addition, the first abutting unit may be extended by the dimension L 1  at a position of the first abutting unit  1326   a  on the outer side of the ear portion  1035   a  in the first direction X; however, it is effective to provide the first abutting unit at a position which is close to the meandering path  1621  as much as possible. 
     In this manner, the first abutting unit  1326  may be provided on four sides of a region in which the meandering path  1621  is provided; however, the first abutting unit may be provided on both sides in any one of the extending direction and the aligning direction. It is not effective when the abutting unit is provided so as to be long, and conversely, there also is a possibility of increasing unevenness since it is difficult to precisely manage the height. In addition, for the same reason, when the abutting unit is provided on both sides in any one of the extending direction and the aligning direction, it is preferable to provide the abutting unit on a side of which a dimension is small. The reason for this is that it is preferable to manage the height, and there is no difference in effects. In addition, according to the embodiment, since the dimension L 1  in the first direction X which is the extending direction is smaller than the dimension L 2  of the second direction Y which is the aligning direction, the first abutting unit  1326  is provided on both sides in the second direction Y. 
     Meanwhile, since the first abutting unit  1326  is extended by a predetermined length compared to the cylindrical abutting unit, it is effective to precisely manage the crushing amount of the second sealing unit  1035 , and since the first abutting unit is provided so as to be closed to a region in which the meandering path  1621  is provided, it is understood that the effect is further improved. 
     In addition, according to the embodiment, the first abutting unit  1326  is provided on both sides in the second direction Y, since the dimension L 1  in the first direction X which is the extending direction is smaller than the dimension L 2  in the second direction Y which is the aligning direction; however, as illustrated in  FIG. 11C , when the dimension L 1  in the first direction X which is the aligning direction is smaller than the dimension L 2  in the second direction Y which is the extending direction, the first abutting unit  1326  is provided on both sides in the extending direction, that is, on both sides in the second direction Y. 
     When the first abutting unit  1326  is provided, as illustrated in  FIGS. 13A and 13B , it is possible to precisely manage the crushing amount of the second sealing unit  1035 , and to perform uniform crushing in the whole unit. That is, as illustrated in  FIG. 13A , the end face of the first abutting unit  1326  and a facing face are separated by D 1  in a state in which the surface of the second sealing unit  1035  comes into contact with wall faces on both sides of the groove of the meandering path  1621 ; however, as illustrated in  FIG. 13B , when the end face of the first abutting unit  1326  comes into contact with the facing face, it becomes a crushing amount of the second sealing unit  1035 , the crushing amount in this case becomes D 1 . Accordingly, by controlling the height of the first abutting unit  1326 , it is possible to precisely control the crushing amount D 1 . In this manner, it is possible to prevent exudation of oil from the second sealing unit  1035  due to excessive crushing, or choking of the meandering path  1621 , or the like, due to the exudation of oil. 
     In addition, according to the embodiment, a second abutting unit  1327  is provided in the vicinity of the fastening member, in order to reduce unevenness by further precisely controlling the crushing amount of the second sealing unit  1035 . That is, as illustrated in  FIG. 12 , the second abutting unit  1327  which is a cylindrical protrusion portion is provided in the vicinity of a through hole for fastening  1325  through which the fastening member of the cover unit  1032  passes. In addition, two second abutting units  1327  are provided in the vicinity of a through hole for fastening  1325  on both sides of a center portion in the first direction X. 
     The second abutting unit  1327  is a unit for assisting the first abutting unit  1326 , it is effective when being a columnar protrusion portion. In addition, by providing the second abutting unit in the vicinity of the fastening member, it is possible to more precisely manage the crushing amount. 
     A cross section in the vicinity of the fastening member in a fastened state is illustrated in  FIG. 14 . As illustrated, a fastening amount of the fastening member  1037  is regulated when the end face of the second abutting unit  1327  comes into contact with a facing face, and the crushing amount of the second sealing unit  1035  is more precisely managed. In this manner, it is possible to prevent exudation of oil from the second sealing unit  1035  due to excessive crushing, or choking of the meandering path  1621 , or the like, due to the exudation of oil. 
     Here, the second abutting unit  1327  is set to a cylindrical protrusion portion; however, by providing the second abutting unit so as to be close to the fastening member  1037 , it is possible to exert the effect of the abutting unit. In addition, the second abutting unit  1327  may be formed as a ring-shaped abutting unit so as to surround the fastening member  1037 ; however, it is more preferable to form the abutting unit so as to be the cylindrical protrusion portion in order to precisely manage the height. 
     In addition, in the above descriptions, a point of controlling the crushing amount of the second sealing unit  1035  has been described; however, as a matter of course, similarly, also the crushing amount of the first sealing unit  1034  and the third sealing unit  1036  are precisely managed. In addition, according to the embodiment, the first abutting unit  1326  and the second abutting unit  1327  are provided in the cover unit  1032 ; however, the abutting units may be provided in the base unit  1031 , and it is needless to say that the same effect is exerted. 
     As illustrated in  FIG. 1 , the head case  1080  which holds a circuit board between the head case and the base unit  1031 , and the head main body  210  which is provided on the base of the head case  1080  are provided on the base of the base unit  1031  of the back-pressure control unit  1020 . 
     The head case  1080  is fixed to the base of the base unit  1031 , and holds the circuit board (not illustrated) between the head case and the base unit  1031 . 
     In the head main body  210 , though one example will be described later, two or more columns in which nozzle openings are aligned are provided, and are provided so as to eject ink of various types which is supplied from each back-pressure control unit  1020  from each nozzle column. According to the embodiment, though it is not particularly illustrated, it is set such that four head main bodies  210  are provided, ink of two colors are ejected from three head main bodies  210 , and ink of one color is ejected from two nozzle columns from one head main body  210 . In this manner, it is possible to eject ink of four colors. In addition, the number of head main bodies  210  or the arrangement is not particularly limited, and for example, the same number of head main bodies  210  as the support path  1059  may be provided. 
     In addition, a pressure generation chamber which communicates with nozzle openings, and a pressure generation unit which causes a pressure change in the pressure generation chamber are provided in the head main body  210 . As the pressure generation unit, for example, it is possible to use a unit which ejects ink droplets from a nozzle opening by causing a pressure change by changing a volume of the pressure generation chamber using deformation of a piezoelectric actuator which includes a piezoelectric material which exhibits a function of electrical-mechanical conversion, a unit which ejects ink droplets from a nozzle opening using bubbles which are generated due to heat generating of a heat generation element, by arranging the heat generation element in the pressure generation chamber, a so-called electrostatic actuator which ejects ink droplets from a nozzle opening by deforming a vibrating plate using an electrostatic force, by generating static electricity between the vibrating plate and an electrode, or the like. 
     Here, an example of the head main body  210  will be described with reference to  FIGS. 15 to 17 . In addition,  FIG. 15  is an exploded perspective view of the head main body,  FIG. 16  is a plan view which is viewed from a liquid ejecting face side of the head main body, and  FIG. 17  is a cross-sectional view which is taken along line XVII-XVII in  FIG. 16 . 
     As illustrated, the head main body  210  includes a plurality of members such as a flow path forming substrate  10 , a communication plate  15 , a nozzle plate  20 , a protection board  30 , a case member  40  which is a holding member, a compliance board  91 , and these plurality of members are bonded using an adhesive, or the like. 
     In the flow path forming substrate  10  which configures the head main body  210 , a plurality of pressure generation chambers  12  are aligned along a direction in which a plurality of nozzle openings  21  are aligned. This direction is also referred to as an aligning direction of the pressure generation chamber  12 , and matches the first direction X. In this manner, also in the nozzle opening  21  which will be described in detail later, two columns of the nozzle opening  21  are arranged by being shifted in the first direction X by an interval of a half, and resolution in the first direction X becomes twice. In addition, according to the embodiment, a plurality of columns, for example, two columns in which the pressure generation chambers  12  are aligned in the first direction X are provided on the flow path forming substrate  10 . The column aligning direction in which the plurality of columns of the pressure generation chamber  12  in which the pressure generation chambers  12  are aligned in the first direction X matches the second direction Y. In addition, in two columns in which the pressure generation chambers  12  are aligned in the first direction X, with respect to one column of the pressure generation chamber  12 , the other column of the pressure generation chamber  12  is arranged at a position which is shifted in the first direction X by a half of a gap between pressure generation chambers  12  which are neighboring in the first direction X. As a matter of course, ink of a different color may be supplied in each column of the pressure generation chamber  12  by setting the positions of two columns of the pressure generation chamber  12  in the first direction X to be the same. In addition, according to the embodiment, as described above, the direction which is orthogonal to the first direction X and the second direction Y is referred to as the third direction Z, and a liquid ejecting direction in a plane including the third direction Z (recording sheet S side which is a medium for ejecting which will be described later) is set to a Z 1  side, and the opposite side is set to a Z 2  side. 
     The communication plate  15  is bonded onto one face of the flow path forming substrate  10  in the third direction Z, that is, a face on the Z 1  side. In addition, the nozzle plate  20  in which the nozzle opening  21  is provided is bonded further on the Z 1  side in the third direction Z of the communication plate  15 . According to the embodiment, the Z 1  side in the third direction Z to which the nozzle opening  21  of the nozzle plate  20  opens becomes a liquid ejecting face  20   a.    
     The nozzle communication path  16  which communicates with the pressure generation chamber  12  and the nozzle opening  21  is provided in the communication plate  15 . The communication plate  15  has a larger area than that of the flow path forming substrate  10 , and the nozzle plate  20  has a smaller area than that of the flow path forming substrate  10 . In this manner, it is possible to reduce costs by making the area of the nozzle plate  20  comparatively small. The area referred to here is an area in an in-plane direction which has the first direction X and the second direction Y. 
     In addition, a first manifold unit  17  and a second manifold unit  18  which configure a part of a manifold  100  are provided on the communication plate  15 . 
     The first manifold unit  17  is provided so as to penetrate the communication plate  15  in the third direction Z. In addition, the second manifold unit  18  is provided halfway in the third direction Z by opening to the nozzle plate  20  side of the communication plate  15 , that is, to the Z 1  side, without penetrating the communication plate  15  in the third direction Z. 
     In addition, on the communication plate  15 , a supply communication path  19  which communicates with one end portion of the pressure generation chamber  12  in the second direction Y is independently provided in each pressure generation chamber  12 . The supply communication path  19  penetrates the communication plate  15  in the third direction Z, and communicates with the second manifold unit  18  and the pressure generation chamber  12 . 
     Meanwhile, a vibrating plate is formed on an opposite face side to the communication plate  15  of the flow path forming substrate  10 , that is, on the Z 2  side. In addition, the piezoelectric actuator  300  which is the pressure generation unit of the embodiment is configured when a first electrode, a piezoelectric layer, and a second electrode are sequentially stacked on the vibrating plate. In general, the piezoelectric actuator  300  is configured by setting any one of electrodes to a common electrode, and by patterning other electrodes and the piezoelectric layer in each pressure generation chamber  12 . 
     In addition, the protection board  30  with approximately the same size as the flow path forming substrate  10  is bonded to the piezoelectric actuator  300  side of the flow path forming substrate  10 , that is, a face on the Z 2  side. The protection board  30  has a holding unit  31  which is a space for protecting the piezoelectric actuator  300 . Two holding units  31  are formed in line in the second direction Y in each piezoelectric actuator  300  which are aligned in the first direction X. In addition, in the protection board  30 , a first connection hole  32  which penetrates the two holding units  31  in the third direction Z, which are aligned in the second direction Y therebetween is provided on the protection board  30 . An end portion of lead electrode  90  which is led out from an electrode of the piezoelectric actuator  300  is extended in the first connection hole  32  so as to be exposed, and the lead electrode  90  and a wiring substrate  121  on which a driving circuit  120  such as a driving IC is mounted are electrically connected in the first connection hole  32 . According to the embodiment, the flow path forming substrate  10 , the communication plate  15 , and the protection board  30  correspond to the flow path member. As a matter of course, the flow path member is not particularly limited to these, as the flow path member, the flow path forming substrate  10  may be formed in a size corresponding to the communication plate  15  without providing the communication plate  15 , and as the flow path member, another member may be further provided. 
     In addition, as illustrated in  FIG. 15 , the case member  40  which demarcates the manifold  100  which communicates with the plurality of pressure generation chambers  12  along with the flow path forming substrate  10  and the protection board  30  is fixed to the protection board  30  and the communication plate  15 . The case member  40  is boned to the protection board  30 , and is bonded to the communication plate  15 . 
     In addition, a third manifold unit  42  which has a concave shape opening to the face on the Z 1  side is formed on the face on the Z 1  side of the case member  40 . In addition, the manifold  100  according to the embodiment is configured of the third manifold unit  42  which is formed in the case member  40 , and the first manifold unit  17  and the second manifold unit  18  which are provided on the communication plate  15 . In addition, according to the embodiment, the manifolds  100  are formed on both sides of the flow path forming substrate  10  by interposing the flow path forming substrate in the second direction Y. As a matter of course, the manifold  100  is not particularly limited to this, and for example, the manifold may be configured only of the third manifold unit  42 , and may be configured of the second manifold unit  18  and the third manifold unit  42 . However, by configuring the manifold  100  using the first manifold unit  17 , the second manifold unit  18 , and the third manifold unit  42  as in the embodiment, it is possible to form the manifold  100  in a large volume as much as possible, without making the ink jet recording head large. 
     In addition, a second connection hole  43  which penetrates the case member  40  in the third direction Z by communicating with the first connection hole  32  of the protection board  30  is provided in the case member  40 . The wiring substrate  121  which is inserted into the second connection hole  43  is inserted into the first connection hole  32 , and is connected to the lead electrode  90  which is lead-out wiring which is led out from the piezoelectric actuator  300 . 
     In addition, the compliance board  91  is provided on a face to which the first manifold unit  17  and the second manifold unit  18  of the communication plate  15  open. The compliance board  91  seals the openings of the first manifold unit  17  and the second manifold unit  18 . That is, the flow path of the flow path member which is configured of the flow path forming substrate  10 , the communication plate  15 , and the protection board  30  according to the embodiment is the first manifold unit  17  and the second manifold unit  18 , and the compliance board  91  seals the Z 1  side which is the liquid ejecting face  20   a  side of the first manifold unit  17  and the second manifold unit  18 . 
     According to the embodiment, the compliance board  91  includes a sealing film  92  and a fixing substrate  93 . The sealing film  92  is formed of a flexible thin film (for example, polyphenelene sulfide (PPS) or stainless steel (SUS)), or the like. In addition, the fixing substrate  93  is formed of a hard material such as metal such as stainless steel (SUS). Since a region of the fixing substrate  93  facing the manifold  100  becomes an opening portion  94  which is completely eliminated in the thickness direction, one face of the manifold  100  becomes a compliance unit  95  which is a flexible portion which is sealed using only the sealing film  92  which is flexible. 
     In addition, the compliance board  91  is continuously provided over the periphery of the nozzle plate  20 . That is, the compliance board  91  is provided with a first exposure opening portion  96  with an inner diameter which is slightly larger than the nozzle plate  20  in a region in which the nozzle plate  20  is arranged. 
     A cover head  270  which protects the nozzle opening  21  in an exposed state is fixed on the liquid ejecting face  20   a  side to which the nozzle opening  21  of the head main body  210  opens. In addition, the cover head  270  is bonded to the fixing substrate  93  of the compliance board  91 , and the case member  40 . 
     A second exposure opening portion  271  of the cover head  270  is formed with an opening area of approximately the same size as the first exposure opening portion  96  of the compliance board  91 , and exposes the liquid ejecting face  20   a  of the nozzle plate  20 . 
     Other Embodiments 
     Hitherto, each embodiment of the invention has been described; however, the basic configuration of the invention is not limited to the above described configuration. 
     The main body of the flow path member is configured of the first main body and the second main body, and the first main body is accommodated in the cover  1030  by stacking in advance; however, it may be a structure in which the entire main body of the flow path member is stacked in advance, is accommodate in the cover, and is interposed between the base unit and the cover unit. 
     In addition, the above described ink jet recording head  1000  configures a part of an ink jet recording head unit which includes an ink flow path which communicates with an ink cartridge, or the like, and is installed in an ink jet recording apparatus.  FIG. 18  is a schematic diagram which illustrates an example of the ink jet recording apparatus. 
     In the ink jet recording apparatus I which is illustrated in  FIG. 18 , an ink jet recording head unit II (hereinafter, also referred to as head unit II) which includes a plurality of the ink jet recording heads  1000  is provided with a detachable ink cartridge  1 A which is a liquid storage unit, and the carriage  3  in which the head unit II is installed is provided in the carriage axis  5  which is attached to the apparatus main body  4  so as to freely move in the axial direction. The recording head unit II is a unit which ejects a black ink composition and a color ink composition, for example. 
     In addition, the carriage  3  in which the head unit II is installed is moved along the carriage axis  5  when a driving force of the driving motor  6  is transmitted to the carriage  3  through a plurality of gears and a timing belt  7  which are not illustrated. Meanwhile, the apparatus main body  4  is provided with a transport roller  8  as a transport unit, and a recording sheet S as a recording medium such as paper, or the like, is transported using the transport roller  8 . In addition, the transport unit which transports the recording sheet S is not limited to the transport roller, and may be a belt, a drum, or the like. 
     In addition, in the above described ink jet recording apparatus I, the ink jet recording head  1  (head unit II) is installed in the carriage  3 , and moves in the main scanning direction; however, it is not particularly limited to this, and for example, it is also possible to apply the invention to a so-called line-type recording apparatus in which the ink jet recording head  1  is fixed, and printing is performed only by moving a recording sheet S such as paper in the sub-scanning direction. 
     In addition, in the above described embodiment, the invention has been described by exemplifying the ink jet recording head as an example of the liquid ejecting head; however, the invention is for an overall liquid ejecting apparatus, and as the liquid ejecting head, for example, there are a coloring material ejecting head which is used when manufacturing a color filter such as a liquid crystal display, an organic EL display, an electrode material ejecting head which is used when forming an electrode such as a field emission display (FED), a bio-organic material ejecting head which is used when manufacturing a biochip, and the like, in addition to various ink jet recording heads which are used in an image recording apparatus such as a printer. 
     In addition, the invention is not limited to a piezoelectric element which is installed in a liquid ejecting head which is represented by an ink jet recording head, and is applied to a piezoelectric element which is installed in other devices, for example, an ultrasonic device such as an ultrasonic transmitter, an ultrasonic motor, a pressure sensor, a pyroelectric sensor, or the like. In addition, the invention is similarly applied to a ferroelectric element such as a ferroelectric memory.