Liquid ejection head and recording device

Abstract

To ensure that liquid supplied to a second flow path member stably flows into a pressure chamber through a through hole.SOLUTION: A liquid discharge head comprises a first flow path member, a second flow path member, and a pressure member. The first flow path member has a first surface, a second surface on the opposite side to the first surface, a plurality of discharge holes opening on the first surface, a supply flow path, a plurality of pressure chambers communicating with the supply flow path and the plurality of discharge holes, and a recovery flow path. The second flow path member overlaps the second surface, supplies liquid to the supply flow path, recovers liquid from the recovery flow path, and is formed by using resin. The plurality of pressure chambers are arranged in a plurality of rows along the second surface. The pressure member overlaps the second surface across the plurality of rows and across two or more pressure chambers within each row. The second flow path member has, on a third surface on the second surface side of the first flow path member, a recess extending across the plurality of rows and across two or more pressure chambers within each row, with the pressure member positioned in the recess.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a liquid ejection head and a recording apparatus.

Background Art

[0002] Conventionally, as a print head, a liquid ejection head that performs various prints by ejecting a liquid onto a recording medium is known. As such a liquid ejection head, a first flow path member having a first surface, a plurality of ejection holes provided on the first surface, a plurality of pressure chambers respectively communicating with the plurality of ejection holes, and a second surface located on the side opposite to the first surface, a pressure member provided on the second surface, a second flow path member having a third surface, a fourth surface located on the side opposite to the third surface, a raised portion protruding from the fourth surface, and a first through hole provided in the raised portion are known. Thereby, the liquid supplied to the second flow path member is suppressed from flowing into the inside through the first through hole (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0004] The liquid ejection head of the present disclosure includes a first flow path member having a first surface, a plurality of ejection holes provided on the first surface, a plurality of pressure chambers respectively communicating with the plurality of ejection holes, and a second surface located on the side opposite to the first surface, a pressure member provided on the second surface, a third surface joined to a region of the second surface where the pressure member is not disposed, a second flow path member having a through hole communicating with the plurality of pressure chambers, and a housing placed on the side opposite to the third surface with respect to the second flow path member, and the through hole opens on the side opposite to the third surface of the second flow path member and outside the housing.

[0005] The recording apparatus of the present disclosure is characterized by including the liquid ejection head, a conveyance unit that conveys a recording medium with respect to the liquid ejection head, and a control unit that controls the liquid ejection head.

Brief Description of the Drawings

[0006]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Best Mode for Carrying Out the Invention

[0007] <First Embodiment> With reference to FIG. 1, a color inkjet printer 1 (hereinafter referred to as printer 1) including a liquid ejection head 2 according to the first embodiment will be described. The drawing illustrates a first direction D1, a second direction D2, a third direction D3, a fourth direction D4, a fifth direction D5, and a sixth direction D6. The first direction D1 is one side in the extending direction of the first common flow path 20 and the second common flow path 24, and the fourth direction D4 is the other side in the extending direction of the first common flow path 20 and the second common flow path 24. The second direction D2 is one side in the extending direction of the first integrated flow path 22 and the second integrated flow path 26, and the fifth direction D5 is the other side in the extending direction of the first integrated flow path 22 and the second integrated flow path 26. The third direction D3 is one side in the direction orthogonal to the extending direction of the first integrated flow path 22 and the second integrated flow path 26, and the sixth direction D6 is the other side in the direction orthogonal to the extending direction of the first integrated flow path 22 and the second integrated flow path 26.

[0008] The printer 1 relatively moves the recording medium P with respect to the liquid ejection head 2 by transporting the recording medium P from the transport roller 74a to the transport roller 74b. The control unit 76 controls the liquid ejection head 2 based on image and character data, ejects liquid toward the recording medium P, lands droplets on the recording medium P, and performs printing on the recording medium P.

[0009] In the present embodiment, the liquid ejection head 2 is fixed to the printer 1, and the printer 1 is a so-called line printer. As another embodiment of the recording apparatus, a so-called serial printer can be mentioned.

[0010] A flat head mounting frame 70 is fixed to the printer 1 so as to be substantially parallel to the recording medium P. Twenty holes (not shown) are provided in the head mounting frame 70, and twenty liquid ejection heads 2 are mounted in the respective holes. Five liquid ejection heads 2 constitute one head group 72, and the printer 1 has four head groups 72.

[0011] The liquid ejection head 2 has an elongated shape extending from the second direction D2 to the fifth direction D5. Within one head group 72, three liquid ejection heads 2 are arranged along the second direction D2 to the fifth direction D5, and the other two liquid ejection heads 2 are arranged at positions shifted in the sixth direction D5. Adjacent liquid ejection heads 2 are arranged such that the printable range of each liquid ejection head 2 is connected from the second direction D2 to the fifth direction D5, or the ends overlap, enabling printing without gaps in the width direction of the recording medium P.

[0012] The four head groups 72 are arranged from the third direction D3 to the sixth direction D6. Ink is supplied to each liquid ejection head 2 from a liquid tank (not shown). The liquid ejection heads 2 belonging to one head group 72 are supplied with the same color ink, and four-color printing is performed with the four head groups. The colors of the ink ejected from each head group 72 are, for example, magenta (M), yellow (Y), cyan (C), and black (K).

[0013] Note that the number of liquid ejection heads 2 mounted on the printer 1 may be one if printing is performed in monochrome within the printable range of one liquid ejection head 2. The number of liquid ejection heads 2 included in the head group 72 or the number of head groups 72 can be appropriately changed according to the printing target and printing conditions. For example, the number of head groups 72 may be increased for further multi-color printing. Also, by arranging a plurality of head groups 72 for printing the same color and printing alternately in the conveyance direction, the printing speed, that is, the conveyance speed, can be increased. Further, a plurality of head groups 72 for printing the same color may be prepared and arranged with a shift in the third direction D3 to increase the resolution in the width direction of the recording medium P.

[0014] Furthermore, in addition to printing colored ink, a liquid such as a coating agent may be printed to perform surface treatment of the recording medium P.

[0015] Printer 1 performs printing on the recording medium P. The recording medium P is in a state of being wound around the conveyance roller 74a, passes between two conveyance rollers 74c, and then passes under the liquid ejection head 2 mounted on the head mounting frame 70. Thereafter, it passes between two conveyance rollers 74d and is finally collected by the conveyance roller 74b.

[0016] As the recording medium P, in addition to printing paper, cloth or the like may be used. Further, the printer 1 may be configured to convey a conveyance belt instead of the recording medium P, and the recording medium P may be, in addition to a roll shape, a sheet of paper, cut cloth, wood, or a tile placed on the conveyance belt. Furthermore, a liquid containing conductive particles may be ejected from the liquid ejection head 2 to print wiring patterns of electronic devices or the like. Also, a predetermined amount of a chemical agent of a liquid or a liquid containing a chemical agent may be ejected from the liquid ejection head 2 toward a reaction vessel or the like and reacted to produce chemicals.

[0017] In addition, a position sensor, a speed sensor, a temperature sensor, etc. may be attached to the printer 1, and the control unit 76 may control each part of the printer 1 according to the state of each part of the printer 1 known from the information of each sensor. In particular, when the ejection characteristics such as the ejection amount and ejection speed of the liquid ejected from the liquid ejection head 2 are affected by external factors, according to the temperature of the liquid ejection head 2, the temperature of the liquid in the liquid tank, or the pressure exerted by the liquid in the liquid tank on the liquid ejection head 2, the drive signal for ejecting the liquid at the liquid ejection head 2 may be changed.

[0018] Next, the liquid ejection head 2 according to the first embodiment will be described with reference to FIGS. 2 to 8. In FIGS. 5 to 7, in order to make the drawings easier to understand, the flow paths and the like that should be drawn with a broken line below other members are drawn with a solid line.

[0019] As shown in FIGS. 2 and 3, the liquid ejection head 2 includes a head main body 2a, a housing 50, a heat sink 52, a wiring board 54, a pressing member 56, an elastic member 58, a signal transmission member 60, and a driver IC 62. Note that the liquid ejection head 2 only needs to include the head main body 2a, and does not necessarily need to include the housing 50, the heat sink 52, the wiring board 54, the pressing member 56, the elastic member 58, the signal transmission member 60, and the driver IC 62.

[0020] The signal transmission member 60 is drawn out from the head main body 2a of the liquid ejection head 2, and the signal transmission member 60 is electrically connected to the wiring board 54. A driver IC 62 for controlling the driving of the liquid ejection head 2 is provided on the signal transmission member 60. The driver IC 62 is pressed against the heat sink 52 by the pressing member 56 via the elastic member 58. Note that illustration of a support member for supporting the wiring board 54 is omitted.

[0021] The heat sink 52 can be formed of metal or an alloy, and is provided to radiate the heat of the driver IC 62 to the outside. The heat sink 52 is joined to the housing 50 with screws or an adhesive.

[0022] The housing 50 is placed on the head main body 2a, and the housing 50 and the heat sink 52 cover each member constituting the liquid ejection head 2. The housing 50 includes openings 50a, 50b, 50c and a heat insulating portion 50d.

[0023] The openings 50a are respectively provided so as to face the third direction D3 and the sixth direction D6, and the heat sink 52 is arranged so as to close the openings 50a. The opening 50b opens downward, and the wiring board 54 and the pressing member 56 are arranged inside the housing 50 through the opening 50b. The opening 50c opens upward, and a connector (not shown) provided on the wiring board 54 is accommodated therein.

[0024] The heat insulation part 50d is provided so as to extend from the second direction D2 to the fifth direction D5, and is disposed between the heat dissipation plate 52 and the head body 2a. Thereby, the heat dissipated to the heat dissipation plate 52 is less likely to be transferred to the head body 2a. The housing 50 can be formed of metal, alloy, or resin.

[0025] As shown in FIG. 4(a), the head body 2a has a long shape extending from the second direction D2 to the fifth direction D5, and includes a first flow path member 4, a second flow path member 6, and a piezoelectric actuator substrate 40. The piezoelectric actuator substrate 40 and the second flow path member 6 are provided on the first flow path member 4. The piezoelectric actuator substrate 40 is placed in the region E of the broken line shown in FIG. 4(a). The piezoelectric actuator substrate 40 is provided to pressurize a plurality of pressure chambers 10 (see FIG. 7(b)) provided in the first flow path member 4, and has a plurality of displacement elements 48 (see FIG. 7(b)). Note that the piezoelectric actuator substrate 40 having the displacement element 48 for pressurizing the pressure chamber 10 is a pressurizing member. Hereinafter, the pressurizing member will be described using the piezoelectric actuator substrate.

[0026] The first flow path member 4 has a flow path formed therein, and guides the liquid supplied from the second flow path member 6 to the discharge holes 8 (see FIG. 7(b)). The first flow path member 4 has a first surface 4-1 and a second surface 4-2, and the discharge holes 8 are formed in the first surface 4-1. Further, openings 20a and 24a are formed in the second surface 4-2.

[0027] The openings 20a are arranged along the second direction D2 to the fifth direction D5, and are disposed at the end in the third direction D3 of the second surface 4-2. The openings 24a are arranged along the second direction D2 to the fifth direction D5, and are disposed at the end in the sixth direction D6 of the second surface 4-2.

[0028] The second flow path member 6 has a flow path formed therein and guides the liquid supplied from a liquid tank provided outside to the first flow path member 4. The second flow path member 6 has a third surface 6-3 and a fourth surface 6-4, and the third surface 6-3 of the second flow path member 6 is placed on the second surface 4-2 of the first flow path member 4.

[0029] The second flow path member 6 is joined to the first flow path member 4 via an adhesive (not shown) outside the placement region E of the piezoelectric actuator substrate 40 indicated by the dashed line. Thereby, the first flow path member 4 and the second flow path member 6 communicate with each other.

[0030] As shown in FIGS. 4 and 5, the second flow path member 6 has a plurality of first through holes 6a, through holes 6b and 6c, a first opening 6d, openings 22a and 26a, and a raised portion 6e. The raised portion 6e has a connecting portion 6f that connects adjacent first through holes 6a. The first through holes 6a are provided in the raised portion 6e so as to extend from the second direction D2 to the fifth direction D5, and are arranged outside the placement region E of the piezoelectric actuator substrate 40. A signal transmission member 60 is inserted into the first through hole 6a.

[0031] The through hole 6b is arranged at the end of the second flow path member 6 in the second direction D2 and supplies liquid from the liquid tank to the second flow path member 6. The through hole 6c is arranged at the end of the second flow path member 6 in the fifth direction D5 and recovers liquid from the second flow path member 6 to the liquid tank. The first opening 6d is provided in the third surface 6-3 of the second flow path member 6, and the piezoelectric actuator substrate 40 is accommodated in the space formed by the first opening 6d and the first flow path member 4.

[0032] The opening 22a is provided in the third surface 6-3 of the second flow path member 6 and is provided so as to extend from the second direction D2 to the fifth direction D5. The opening 22a is formed at the end of the second flow path member 6 in the third direction D3 and is provided on the third direction D3 side of the first through hole 6a. The opening 22a communicates with the through hole 6b, and when the opening 22a is sealed by the first flow path member 4, the first integrated flow path 22 is formed.

[0033] The opening 26a is provided on the third surface 6-3 of the second flow path member 6 and is provided so as to extend from the second direction D2 toward the fifth direction D5. The opening 26a is formed at the end of the second flow path member 6 in the sixth direction D6 and is provided on the sixth direction D6 side of the first through hole 6a. The opening 26a communicates with the through hole 6c. By sealing the opening 26a with the first flow path member 4, the second integrated flow path 26 is formed.

[0034] The first integrated flow path 22 is formed so as to extend from the second direction D2 to the fifth direction D5 and supplies liquid to the opening 20a of the first flow path member 4. The second integrated flow path 26 is formed so as to extend from the second direction D2 to the fifth direction D5 and recovers liquid from the opening 24a of the first flow path member 4.

[0035] The raised portion 6e protrudes upward from the fourth surface 6-4 and is disposed higher than the fourth surface 6-4. The first through hole 6a is provided in the raised portion 6e, and the height of the surface on which the first through hole 6a is formed is higher than the fourth surface 6-4 on which the through holes 6b and 6c are formed. Thereby, even when liquid leaks onto the fourth surface 6-4 from the through holes 6b and 6c, since the first through hole 6a is provided in the raised portion 6e, it becomes difficult for the leaked liquid to flow into the inside through the first through hole 6a. The height of the raised portion 6e can be 1 to 5 mm, and since the height is 1 mm or more, it becomes difficult for liquid to flow into the first through hole 6a.

[0036] The connecting portion 6f is provided so as to connect adjacent first through holes 6a and is formed so as to extend from the second direction D2 to the fifth direction D5. By providing the connecting portion 6f, the piezoelectric actuator substrate 40 is covered by the connecting portion 6f, and it becomes difficult for liquid to adhere to the piezoelectric actuator substrate 40 located at the first opening 6d.

[0037] In addition, since the connecting portion 6f connects the first through holes 6a to each other, the rigidity of the second flow path member 6 can be increased, and deformation of the second flow path member 6 is less likely to occur.

[0038] With the above configuration, in the second flow path member 6, the liquid supplied from the liquid tank to the through hole 6b is supplied to the first integrated flow path 22, flows into the first common flow path 20 through the openings 20a and 22a, and the liquid is supplied to the first flow path member 4. Then, the liquid recovered by the second common flow path 24 flows into the second integrated flow path 26 through the openings 24a and 26a, and the liquid is recovered to the outside through the through hole 6c.

[0039] The first flow path member 4 will be described with reference to FIGS. 5 to 7.

[0040] The first flow path member 4 is formed by laminating a plurality of plates 4a to 4g, and has a first surface 4-1 and a second surface 4-2. A piezoelectric actuator substrate 40 is placed on the second surface 4-2, and liquid is discharged from a discharge hole 8 provided in the first surface 4-1. The plurality of plates 4a to 4g can be formed of metal, alloy, or resin. Note that the first flow path member 4 may be integrally formed of resin without laminating the plurality of plates 4a to 4g.

[0041] The first flow path member 4 is formed with a plurality of first common flow paths 20, a plurality of second common flow paths 24, and a plurality of individual units 15, and openings 20a and 24a are formed in the second surface 4-2.

[0042] The first common flow path 20 is provided so as to extend from the first direction D1 to the fourth direction D4, and is formed to communicate with the opening 20a. Also, a plurality of first common flow paths 20 are arranged in the direction from the second direction D2 to the fifth direction D5.

[0043] The second common flow path 24 is provided so as to extend from the fourth direction D4 to the first direction D1, and is formed to communicate with the opening 24a. Also, a plurality of second common flow paths 24 are arranged in the direction from the second direction D2 to the fifth direction D5, and are arranged between adjacent first common flow paths 20. Therefore, the first common flow path 20 and the second common flow path 24 are alternately arranged in the direction from the second direction D2 to the fifth direction D5.

[0044] The ejection unit 15 is provided between the adjacent first common flow path 20 and second common flow path 24, and is formed in a matrix in the planar direction of the first flow path member 4. The angles formed by the first direction D1 and the fourth direction D4 and the second direction D2 and the fifth direction D5 are greater than a right angle. For this reason, the ejection units 15 connected to the same first common flow path 20 are arranged shifted in the second direction D2, and printing can be performed so as to fill a predetermined range with pixels formed by the ejected liquid.

[0045] When the ejection holes 8 are projected in the third direction D3 and the sixth direction D6, 32 ejection holes 8 are projected within the range of the virtual straight line R, and the ejection holes 8 are arranged at intervals of 360 dpi within the virtual straight line R. Thus, if the recording medium P is conveyed and printed in a direction orthogonal to the virtual straight line R, printing can be performed at a resolution of 360 dpi.

[0046] As shown in FIG. 7, the ejection unit 15 has an ejection hole 8, a pressure chamber 10, a first individual flow path 12, and a second individual flow path 14. In the liquid ejection head 2, liquid is supplied from the first individual flow path 12 to the pressure chamber 10, and the second individual flow path 14 recovers the liquid from the pressure chamber 10.

[0047] The pressure chamber 10 has a pressure chamber main body 10a and a partial flow path 10b. The pressure chamber main body 10a is circular in plan view, and the partial flow path 10b extends downward from the center of the pressure chamber main body 10a. The pressure chamber main body 10a is configured to apply pressure to the liquid in the partial flow path 10b by receiving pressure from a displacement element 48 provided on the pressure chamber main body 10a.

[0048] The pressure chamber main body 10a has a straight cylindrical shape, and its planar shape is circular. By having a circular planar shape, the displacement amount and the volume change of the pressure chamber 10 caused by the displacement can be increased.

[0049] The partial flow path 10b has a straight circular cylinder shape with a diameter smaller than that of the pressure chamber main body 10a, and its planar shape is circular. The partial flow path 10b is arranged at a position that fits within the pressure chamber main body 10a when viewed from the second surface 4-2. The partial flow path 10b connects the pressure chamber main body 10a and the discharge hole 8.

[0050] Note that the partial flow path 10b may have a conical shape or a frustum conical shape whose cross-sectional area decreases toward the discharge hole 8 side. Thereby, the flow path resistance of the first common flow path 20 and the second common flow path 24 can be increased, and the difference in pressure loss can be reduced.

[0051] The pressure chambers 10 are arranged along both sides of the first common flow path 20, and the first common flow path 20 and the pressure chambers 10 arranged side by side on both sides thereof are connected via the first individual flow paths 12. Also, the pressure chambers 10 are arranged along both sides of the second common flow path 24, and the second common flow path 24 and the pressure chambers 10 arranged side by side on both sides thereof are connected via the second individual flow paths 14.

[0052] The first individual flow path 12 connects the first common flow path 20 and the pressure chamber main body 10a. The first individual flow path 12 extends upward from the upper surface of the first common flow path 20 and then extends in the second direction D2 or the fifth direction D5, and is connected to the lower surface of the pressure chamber main body 10a.

[0053] The second individual flow path 14 connects the second common flow path 24 and the partial flow path 10b. The second individual flow path 14 extends from the lower surface of the second common flow path 24 in the second direction D2 or the fifth direction D5, extends in the first direction D1 or the fourth direction D4, and is connected to the side surface of the partial flow path 10b.

[0054] With the above configuration, in the first flow path member 4, the liquid supplied to the first common flow path 20 through the opening 20a flows into the pressure chamber main body 10a through the first individual flow path 12, is supplied to the partial flow path 10b, and a part of the liquid is discharged from the discharge hole 8. Then, the remaining liquid is collected from the partial flow path 10b into the second common flow path 24 through the second individual flow path 14, and is collected from the first flow path member 4 into the second flow path member 6 through the opening 24a.

[0055] On the upper surface of the first flow path member 4, a piezoelectric actuator substrate 40 including displacement elements 48 is joined, and the displacement elements 48 are arranged so as to be positioned above the pressure chambers 10. The piezoelectric actuator substrate 40 occupies a region having substantially the same shape as the group of pressure chambers formed by the pressure chambers 10. Further, the openings of the pressure chambers 10 are closed by joining the piezoelectric actuator substrate 40 to the second surface 4-2 of the first flow path member 4.

[0056] The piezoelectric actuator substrate 40 has a laminated structure composed of two piezoelectric ceramic layers 40a and 40b which are piezoelectric bodies. These piezoelectric ceramic layers 40a and 40b each have a thickness of about 20 μm. Each of the piezoelectric ceramic layers 40a and 40b extends so as to straddle a plurality of pressure chambers 10.

[0057] These piezoelectric ceramic layers 40a and 40b are made of ceramic materials such as lead zirconate titanate (PZT)-based, NaNbO3-based, BaTiO3-based, (BiNa)NbO3-based, BiNaNb5O 15 systems having ferroelectricity, etc. Note that the piezoelectric ceramic layer 40b functions as a diaphragm and does not necessarily have to be a piezoelectric body, and instead, another ceramic layer or metal plate that is not a piezoelectric body may be used.

[0058] On the piezoelectric actuator substrate 40, a common electrode 42, individual electrodes 44, and connection electrodes 46 are formed. The common electrode 42 is formed over substantially the entire surface in the plane direction in the region between the piezoelectric ceramic layer 40a and the piezoelectric ceramic layer 40b. And the individual electrodes 44 are arranged at positions facing the pressurization chamber 10 on the upper surface of the piezoelectric actuator substrate 40.

[0059] The portion sandwiched between the individual electrode 44 and the common electrode 42 of the piezoelectric ceramic layer 40a is polarized in the thickness direction and becomes a displacement element 48 having a unimorph structure that is displaced when a voltage is applied to the individual electrode 44. Therefore, the piezoelectric actuator substrate 40 has a plurality of displacement elements 48.

[0060] The common electrode 42 can be formed of a metal material such as an Ag-Pd system, and the thickness of the common electrode 42 can be about 2 μm. The common electrode 42 has a surface electrode for common electrode (not shown) on the piezoelectric ceramic layer 40a, and the surface electrode for common electrode is connected to the common electrode 42 through a via hole formed through the piezoelectric ceramic layer 40a, and is grounded and held at the ground potential.

[0061] The individual electrode 44 is formed of a metal material such as an Au system, and has an individual electrode body 44a and a lead-out electrode 44b. As shown in FIG. 7(a), the individual electrode body 44a is formed in a substantially circular shape in plan view and is formed smaller than the pressurization chamber body 10a. The lead-out electrode 44b is drawn out from the individual electrode body 44a, and the connection electrode 46 is formed on the drawn lead-out electrode 44b.

[0062] The connection electrode 46 is made of silver-palladium containing, for example, glass frit, has a thickness of about 15 μm, and is formed in a convex shape. The connection electrode 46 is electrically joined to an electrode (not shown) provided on the signal transmission member 60.

[0063] Next, the liquid ejection operation will be described. The displacement element 48 is displaced by a drive signal supplied to the individual electrode 44 under the control from the control unit 76 via the driver IC 62 or the like. As the driving method, so-called push-pull driving can be used.

[0064] The connection between the first flow path member 4 and the second flow path member 6 will be described in detail with reference to FIG. 8. In FIG. 8(b), the illustration of the signal transmission member 60 is omitted.

[0065] The first flow path member 4 and the second flow path member 6 are connected by an epoxy-based adhesive (not shown) with the second surface 4-2 of the first flow path member 4 and the third surface 6-3 of the second flow path member 6 as the bonding surfaces.

[0066] The second flow path member 6 has a first integrated flow path 22 and a second integrated flow path 26 formed therein. The first integrated flow path 22 and the second integrated flow path 26 will be described below as the first flow path. The first integrated flow path 22 is formed by the partition wall 22b and the second surface 4-2 of the first flow path member 4. The second integrated flow path 26 is formed by the partition wall 26b and the second surface 4-2 of the first flow path member 4.

[0067] The fourth surface 6-4 of the second flow path member 6 has a first portion 6-4a, a second portion 6-4b, and a third portion 6-4c. The first portion 6-4a is a portion located on the first integrated flow path 22 and the second integrated flow path 26. The second portion 6-4b is a portion located on the partition wall 22b of the first integrated flow path 22 and the partition wall 26b of the second integrated flow path 26. The third portion 6-4c is located outside the first opening 6d and is a portion other than the first portion 6-4a and the second portion 6-4b.

[0068] The raised portion 6e is provided so as to project upward from the fourth surface 6-4 of the second flow path member 6. In plan view, the raised portion 6e is provided at the center of the second direction D2, the fifth direction D5, the third direction D3, and the sixth direction D6 of the fourth surface 6-4 of the second flow path member 6. The outer periphery 7a of the raised portion 6e is located inside the outer periphery 7b of the fourth surface 6-4 in plan view. Further, the outer periphery of the first opening 6d is located inside the outer periphery 7a of the raised portion 6e.

[0069] A method of connecting the first flow path member 4 and the second flow path member 6 will be described. First, an adhesive is applied to the third surface 6-3 of the second flow path member 6, and the second surface 4-2 of the first flow path member 4 is overlapped while being aligned. Next, the fourth surface 6-4 of the second flow path member 6 is pressed using a predetermined jig to connect the first flow path member 4 and the second flow path member 6. Subsequently, while crimping the second flow path member 6, a predetermined heat is applied to cure the adhesive, and the first flow path member 4 and the second flow path member 6 are connected.

[0070] Here, when pressing the second flow path member 6 from the fourth surface 6-4 side, since the raised portion 6e projects from the fourth surface 6-4, in order to connect the first flow path member 4 and the second flow path member 6, it is necessary to press both the fourth surface 6-4 and the upper surface of the raised portion 6e simultaneously. However, the fourth surface 6-4 and the raised portion 6e have different heights, and there may be a case where they cannot be pressed with a uniform force. As a result, a uniform pressing force cannot be applied to the joint surface between the first flow path member 4 and the second flow path member 6, and there is a risk that the sealing performance of the joint surface between the first flow path member 4 and the second flow path member 6 deteriorates.

[0071] On the other hand, in the liquid ejection head 2, in plan view, the outer periphery 7a of the raised portion 6e is located inside the outer periphery 7b of the fourth surface 6-4. Therefore, in plan view, the fourth surface 6-4 of the second flow path member 6 surrounds the raised portion 6e. As a result, the first flow path member 4 and the second flow path member 6 can be connected by pressing only the fourth surface 6-4, and a uniform pressing force can be applied to the joint surface between the first flow path member 4 and the second flow path member 6. Therefore, the sealing performance between the first flow path member 4 and the second flow path member 6 can be improved.

[0072] That is, by pressing only the fourth surface 6-4 surrounding the raised portion 6e, a uniform pressing force can be applied to the joint surface between the first flow path member 4 and the second flow path member 6, and the sealing performance of the joint surface between the first flow path member 4 and the second flow path member 6 corresponding to the fourth surface 6-4 can be improved.

[0073] Note that the outer periphery 7a of the raised portion 6e means the outer edge of the raised portion 6e when viewed in plan, and the outer periphery 7b of the fourth surface 6-4 means the outer edge of the fourth surface 6-4 when viewed in plan.

[0074] Further, in the fourth surface 6-4, a first part 6-4a located on the first integrated flow path 22 and the second integrated flow path 26 is formed flush. In other words, in the fourth surface 6-4, a first part 6-4a located on the first integrated flow path 22 and the second integrated flow path 26 is formed flat. Thereby, the pressing force generated when pressing the second flow path member 6 is uniformly applied to the first part 6-4a provided on the fourth surface 6-4. As a result, deformation is less likely to occur in the second flow path member 6 located between the first part 6-4a and the openings 22a, 26a, and deformation is less likely to occur in the first integrated flow path 22 and the second integrated flow path 26.

[0075] Therefore, the cross-sectional areas of the first integrated flow path 22 and the second integrated flow path 26 can be made closer to a constant value, the pressure loss up to each discharge unit 15 (see FIG. 7) can be made closer to a constant value, and variations in the discharge characteristics of the discharge unit 15 can be reduced.

[0076] Also, in the fourth surface 6-4, a second part 6-4b located on the partition wall 22b of the first integrated flow path 22 and the partition wall 26b of the second integrated flow path 26 is formed flush. In other words, in the fourth surface 6-4, a second part 6-4b located on the partition wall 22b of the first integrated flow path 22 and the partition wall 26b of the second integrated flow path 26 is formed flat. Thereby, the joint surface between the first flow path member 4 and the second flow path member 6 corresponding to the second part 6-4b can be pressed with a uniform pressing force, and the sealing performance between the first flow path member 4 and the second flow path member 6 can be improved.

[0077] That is, by directly pressing the second part 6-4b against the joint surface between the first flow path member 4 and the second flow path member 6 serving as the bonding margin, a uniform pressing force can be applied to the joint surface between the first flow path member 4 and the second flow path member 6, and the sealing performance between the first flow path member 4 and the second flow path member 6 can be improved.

[0078] Particularly, in the case of the second flow path member 6 formed long from the second direction D2 to the fifth direction D5, the second flow path member 6 may warp or deflect from the second direction D2 to the fifth direction D5. In contrast, the liquid ejection head 2 can firmly press the second part 6-4b because the second part 6-4b is formed flush, and the sealing performance between the first flow path member 4 and the second flow path member 6 can be enhanced.

[0079] Further, the second flow path member 6 is provided with a first opening 6d in the fourth surface 6-4, a piezoelectric actuator substrate 40 is accommodated in the space formed by the first opening 6d and the first flow path member 4, and the fourth surface 6-4 located outside the first opening 6d is formed flush. In other words, the fourth surface 6-4 located outside the first opening 6d is formed flat. Thereby, a uniform pressing force can be applied to the joint surface between the first flow path member 4 and the second flow path member 6, and the space formed by the first opening 6d and the first flow path member 4 can be sealed. As a result, when the piezoelectric actuator substrate 40 is disposed in the space, the piezoelectric actuator substrate 40 can be sealed, and the possibility of damage to the liquid ejection head 2 can be reduced.

[0080] Note that the fact that the fourth surface 6-4, the first part 6-4a, the second part 6-4b, and the third part 6-4c are formed flush means that the fourth surface 6-4, the first part 6-4a, the second part 6-4b, and the third part 6-4c are formed flat, respectively, and indicates that the flatness is 0.3 or less.

[0081] Further, the second flow path member 6 has a connecting portion 6f that connects adjacent first through holes 6a. Therefore, the reduction in rigidity caused by providing the first through holes 6a can be enhanced by the connecting portion 6f, and the second flow path member 6 is less likely to be deformed. Therefore, the flatness of the fourth surface 6-4 of the second flow path member 6 can be maintained, and the sealing performance between the first flow path member 4 and the second flow path member 6 can be improved.

[0082] Furthermore, since the connecting portion 6f is disposed above the piezoelectric actuator substrate 40, the piezoelectric actuator substrate 40 is covered by the connecting portion 6f, and even if ink or ink mist enters from above the second flow path member 6, it is less likely to leak to the piezoelectric actuator substrate 40.

[0083] Also, the signal transmission member 60 is drawn upward in a state of being in contact with the raised portion 6e that constitutes the first through hole 6a. Therefore, the signal transmission member 60 is guided by the raised portion 6e and drawn upward. As a result, it becomes easier to draw the signal transmission member 60 upward, and the productivity of the liquid ejection head 2 can be improved.

[0084] Note that, although an example in which the liquid ejection head 2 has a plurality of first through holes 6a has been shown, the present invention is not limited thereto. The liquid ejection head 2 may have only one first through hole 6a.

[0085] <Second Embodiment> The liquid ejection head 102 according to the second embodiment will be described with reference to FIG. 9. Note that the same members are denoted by the same reference numerals.

[0086] The liquid ejection head 102 includes a first flow path member 4, a piezoelectric actuator substrate 40, a second flow path member 106, a housing 150, a heat dissipation plate 152, and an elastic member 9. The second flow path member 106 has a third surface 106-3, a fourth surface 106-4, a first through hole 106a, and a raised portion 106e. The connecting portion 106f includes a first opening 106d that opens to the third surface 106-3 side and a second opening 106g that opens to the third surface 106-3 side. The second opening 106g is provided in communication with the first opening 106d.

[0087] The connecting portion 106f includes a second opening 106g that opens to the third surface 106-3 side. Thereby, while ensuring the rigidity of the second flow path member 106, the weight of the second flow path member 106 can be reduced. In particular, it is useful when the liquid ejection head 102 is used in a serial printer.

[0088] Also, the width of the partition wall 106f between the first through hole 106a and the second opening 106g of the connecting portion 106f is equal to the widths of the partition wall 22b of the first integrated flow path 22 and the partition wall 26b of the second integrated flow path 26.

[0089] Thereby, when the second flow path member 106 is manufactured by injection molding, the resin filling speeds of the partition wall 106f between the first through hole 106a and the second opening 106g of the connecting portion 106f, the partition wall 22b of the first integrated flow path 22, and the partition wall 26b of the second integrated flow path 26 can be made closer to uniform.

[0090] As a result, thickness variations are less likely to occur in the connecting portion 106f, the partition wall 22b of the first integrated flow path 22, and the partition wall 26b of the second integrated flow path 26, and a second flow path member 106 that is less likely to deform can be supplied.

[0091] Note that the equality of the thicknesses of the partition walls 106f, 22b, and 26b includes manufacturing errors and is a concept including a range of ±15%.

[0092] The housing 150 is provided on the second flow path member 106 and is placed on the fourth surface 106-4 which is located outside the raised portion 106e. Therefore, compared with the case where the housing 150 is placed on the fourth surface 106-4 and the raised portion 106e, the height of the liquid ejection head 102 can be lowered, and the liquid ejection head 102 can be miniaturized.

[0093] Also, since the fourth surface 106-4 is formed flush, the housing 150 is stably placed. As a result, stress is less likely to concentrate on the joint portion between the housing 150 and the second flow path member 106, and the reliability of the liquid ejection head 102 can be improved.

[0094] Also, the elastic member 9 is provided adjacent to the outer periphery 107a of the raised portion 106e and is provided so as to surround the outer periphery 107a in a state of being in contact with the outer periphery 107a of the raised portion 106e. Therefore, when the housing 150 is joined to the second flow path member 106, even if the heat insulation portion 150d is pressed against the second flow path member 106, the elastic member 9 elastically deforms, and the possibility of damage to the heat insulation portion 150d can be reduced.

[0095] Furthermore, since the elastic member 9 is provided so as to contact the outer periphery 107a of the raised portion 106e, the sealing property between the raised portion 106e and the housing 150 can be improved. The elastic member 9 can be formed of, for example, a resin material.

[0096] Also, the elastic member 9 is in contact with the raised portion 106e and the fourth surface 106-4 of the second flow path member 106. Therefore, even if the housing 150 is pressed against the raised portion 106e and the fourth surface 106-4, the possibility of damage to the housing 150 can be reduced.

[0097] That is, when joining the housing 150 to the second flow path member 106 or when joining the heat sink 152 to the housing 150, the housing 150 may be pressed toward the raised portion 106e side or the fourth surface 106-4. However, since the elastic member 9 is in contact with the raised portion 106e and the fourth surface 106-4 of the second flow path member 106, damage to the housing 150 is less likely to occur.

[0098] Also, the elastic member 9 is provided between the housing 150 and the heat sink 152. Thereby, the possibility that the heat sink 152 is damaged even when pressed against the raised portion 106e can be reduced, and the sealing property of the opening 50a (see FIG. 2) of the housing 150 can be enhanced.

[0099] The elastic member 9 may be formed by applying and curing an epoxy-based resin, or a resin or metal O-ring may be used.

[0100] <Third Embodiment> The liquid ejection head 202 according to the third embodiment will be described with reference to FIGS. 10 and 11.

[0101] The second flow path member 206 has a third surface 206-3, a fourth surface 206-4, a first through hole 206a, a raised portion 206e, and a connecting portion 206f.

[0102] The connecting portion 206f includes a first opening 206d that opens to the third surface 206-3 side, a second opening 206g that opens to the third surface 206-3 side, a third opening 206k, and a second through hole 206i. The second opening 206g is provided in communication with the first opening 206d.

[0103] The third opening 206k is provided so as to communicate with the first opening 206d and is provided away from the second opening 206g. The third opening 206k is provided outside the second opening 206g in the second direction D2 and outside the second opening 206g in the fifth direction D5 in a plan view.

[0104] In a plan view, a third opening 206k is provided outside a second opening 206g in the connecting portion 207f. In other words, the third opening 206k is provided outside the second opening 206g in the second direction D2 and outside the second opening 206g in the fifth direction D5, respectively. Thereby, when the second flow path member 206 is manufactured by injection molding, even if resin is filled from the fifth direction D5 toward the second direction D2, a large amount of resin hardly flows into the connecting portion 207f. Thereby, it becomes difficult for the resin to be insufficient in the partition wall 206h formed by the first through hole 206a and the second opening 206g, the partition wall 22b of the first integrated flow path 22, and the partition wall 26b of the second integrated flow path 26.

[0105] That is, the resin flowing from the fifth direction D5 toward the second direction D2 easily flows into the connecting portion 206f having a large cross-sectional area. However, due to the presence of the third opening 206k, the cross-sectional area of the partition wall 206h of the connecting portion 206f can be made close to the cross-sectional areas of the partition walls 22b and 26b, and the resin filling speed in the vicinity of the third opening 206k can be made nearly uniform.

[0106] In addition, even when resin is filled from the second direction D2 toward the fifth direction D5, since the third opening 206k is provided outside the second opening 206g in the second direction D2, the same effect can be achieved.

[0107] Further, the third opening 206k does not necessarily have to be provided outside the second opening 206g in the second direction D2 and outside the second opening 206g in the fifth direction D5 in a plan view, and may be provided on the upstream side in the resin filling direction from the second opening 206g.

[0108] In addition, in a plan view, among the walls constituting the third opening 206k, a recess 206j is provided on the side opposite to the second opening 206g. Thereby, when resin is filled from the fifth direction D5 toward the second direction D2, resin more easily flows into the connecting portion 207f than into the partition walls 22b and 22d, and resin shortage hardly occurs in the connecting portion 207f. That is, while ensuring the amount of resin flowing into the partition walls 22b and 26b, a sufficient amount of resin can be poured into the connecting portion 207f.

[0109] The second through-hole 206i is provided so as to communicate with the first opening 206d, and is provided separately from the second opening 206g and the third opening 206k. The second through-hole 206i is provided between the second opening 206g and the third opening 206k.

[0110] The second through-hole 206i has a first portion 206i1 and a second portion 206i2. The first portion 206i1 is provided inward from the raised portion 206e of the second flow path member 206. The second portion 206i2 is provided inward from the first opening 206d of the second flow path member 206. The first portion 206i1 and the second portion 206i2 are provided so as to communicate with each other.

[0111] The first portion 206i1 is circular in plan view. The second portion 206i2 is rectangular in plan view. In plan view, the second portion 206i2 has vertices where the sides intersect, and the vertices are positioned so as to face the second direction D2. The diagonal of the second portion 206i2 is formed longer than the diameter of the first portion 206i1. Therefore, in plan view, the second portion 206i2 is formed larger than the first portion 206i1.

[0112] The fixing member 28 is accommodated in the second portion 206i2. As the fixing member 28, for example, a nut or the like can be used, and a screw inserted from the raised portion 206e side is screwed. Thereby, a member provided on the second flow path member 206 can be fixed to the second flow path member 206.

[0113] When viewed in plan view, the vertex of the second part 206i2 is positioned to face the second direction D2. Therefore, when the second flow path member 206 is manufactured by injection molding, the flow of the supplied resin is less likely to be obstructed by the second through hole 206i. That is, after the supplied resin collides with the vertex, it flows along the side of the second part 206i2 to the partition wall 206h between the first through hole 206a and the second opening 206g. As a result, resin can be smoothly supplied to the partition wall 206h between the first through hole 206a and the second opening 206g. Therefore, it is less likely that the amount of resin supplied to the partition wall 206h will be insufficient.

[0114] Note that the second part 206i2 only needs to be polygonal when viewed in plan view, and is not limited to a rectangular shape. For example, it may be hexagonal. Also, the second through hole 206i does not have to have the first part 206i1 and the second part 206i2, and may be polygonal columnar.

[0115] As described above, the first, second, and third embodiments have been described, but the present invention is not limited to the above embodiments, and various modifications are possible without departing from the spirit thereof.

[0116] For example, although the actuator substrate 40 is exemplified as the pressing member, it is not limited thereto. For example, a heating part may be provided for each pressure chamber 10, and the liquid inside the pressure chamber 10 may be heated by the heat of the heating part, and a pressing member that presses by the thermal expansion of the liquid may be used.

[0117] Also, although the substrate discharge head 2 is shown as having a configuration in which liquid is supplied from the through hole 6b of the second flow path member 6 and the liquid that has not been discharged from the through hole 6c is recovered, it is not limited thereto. For example, a configuration in which liquid is supplied from the through hole 6c of the second flow path member 6 and the liquid that has not been discharged from the through hole 6b is recovered may also be used.

[0118] The following concepts can be extracted from the present disclosure. (Concept 1) A first flow path member having a first surface, a plurality of discharge holes provided in the first surface, a plurality of pressure chambers respectively communicating with the plurality of discharge holes, and a second surface located on the side opposite to the first surface, a pressure member provided on the second surface, a second flow path member having a third surface, a fourth surface located on the side opposite to the third surface, a raised portion protruding from the fourth surface, and a first through hole provided in the raised portion, the second flow path member is provided on a region of the second surface of the first flow path member where the pressure member is not disposed, A liquid discharge head, wherein in a plan view, an outer periphery of the raised portion is located inside an outer periphery of the fourth surface. (Concept 2) the second flow path member has a first flow path inside, The liquid discharge head according to Concept 1, wherein a portion of the fourth surface located on the first flow path is formed flush. (Concept 3) the second flow path member has a partition wall constituting the first flow path, The liquid discharge head according to Concept 2, wherein in a plan view, a portion of the fourth surface located on the partition wall is formed flush. (Concept 4) a first opening is provided in the third surface of the second flow path member, the pressure member is housed in a space formed by the first opening and the first flow path member, The liquid discharge head according to any one of Concepts 1 to 3, wherein in a plan view, the fourth surface located outside the first opening is formed flush. (Concept 5) The liquid discharge head according to any one of Concepts 1 to 4, wherein the second flow path member has a plurality of the first through holes and a connecting portion connecting adjacent first through holes. (Concept 6) The liquid discharge head according to Concept 5, wherein the connecting portion has a second opening on the third surface side. (Concept 7) The liquid discharge head according to Concept 6, wherein, in a plan view, the connecting portion has a third opening located outside the second opening. (Concept 8) The liquid discharge head according to Concept 7, wherein, in a plan view, a portion of the partition wall constituting the third opening, which is located on the side opposite to the second opening, has a recess. (Concept 9) The second flow path member is formed long in the first direction. The connecting portion has a second through hole for accommodating a fixing member. The liquid discharge head according to Concept 8, wherein, in a plan view, the second through hole has a polygonal shape and vertices are located in the first direction. (Concept 10) The second flow path member has a first flow path inside. The liquid discharge head according to any one of Concepts 6 to 9, wherein the thickness of the partition wall between the first through hole and the second opening of the connecting portion is equal to the thickness of the partition wall constituting the first flow path. (Concept 11) The liquid discharge head according to any one of Concepts 1 to 10, wherein a signal transmission member for transmitting a signal to the pressurizing member is pulled upward in a state of being in contact with the raised portion constituting the first through hole. (Concept 12) The liquid discharge head according to any one of Concepts 1 to 11, further comprising a housing placed on the fourth surface. (Concept 13) The liquid discharge head according to any one of Concepts 1 to 12, wherein an elastic member is disposed adjacent to the outer periphery of the raised portion in a plan view. (Concept 14) The liquid discharge head according to Concept 13, wherein the elastic member is in contact with the raised portion and the fourth surface. (Concept 15) A liquid discharge head according to any one of Concepts 1 to 14, a conveyance unit that conveys a recording medium with respect to the liquid discharge head, and a control unit that controls the liquid discharge head, characterized in that the recording apparatus is provided.

Explanation of Signs

[0119] 1... Color inkjet printer 2... Liquid ejection head 2a... Head body 4... First flow path member 4a~4g... Plate 4-1... First surface 4-2... Second surface 6, 106, 206... Second flow path member 6a, 106a, 206a... First through hole 6b, 6c... Through hole 6d, 106d, 206d... First opening 6e, 106e, 206e... Protrusion 6f, 106f, 206f... Connection part 106g, 206g... Second opening 106h, 206h... Partition wall 206i... Second through hole 206j... Recess 206k... Third opening 6-3, 106-3, 206-3... Third surface 6-4, 106-4, 206-4... Fourth surface 8... Ejection hole 10... Pressure chamber 12... First individual flow path 14... Second individual flow path 15... Ejection unit 20... First common flow path 22... First integrated flow path (first flow path) 22a... Partition wall 24... Second common flow path 26... Second integrated flow path (first flow path) 26a... Partition wall 40... Piezoelectric actuator substrate (pressurizing member) 48... Displacement element 50... Housing 52... Heat sink 76... Control unit P... Recording medium

Claims

1. A first flow path member constructed by stacking a plurality of plates, having a first surface, a second surface opposite to the first surface, a plurality of discharge holes opening into the first surface, a third flow path, a plurality of pressure chambers communicating with the third flow path and the plurality of discharge holes, and a fourth flow path; a second flow path member overlapping the second surface via an adhesive; Equipped with The second flow path member is a first flow path that communicates with the third flow path and is made of resin; a second flow path communicating with the third flow path via the fourth flow path; Liquid ejection head.

2. The fourth flow path is connected to the third flow path via the plurality of pressure chambers. The liquid ejection head according to claim 1 .

3. Each of the plurality of pressure chambers is A pressurizing chamber body; a partial flow path extending from the pressurizing chamber body toward the first surface, having a diameter smaller than a diameter of the pressurizing chamber body, and connecting the pressurizing chamber body and the discharge hole, The first flow path member is a plurality of first individual flow paths extending from the third flow path to the plurality of pressurizing chamber bodies; a plurality of second individual flow paths extending from the plurality of partial flow paths to the fourth flow path; The liquid ejection head according to claim 2 .

4. Each of the plurality of first individual flow paths opens to a surface on the side of the first surface of the pressure chamber body, Each of the plurality of second individual flow paths is open to a side surface of the partial flow path. The liquid ejection head according to claim 3 .

5. The first flow path member has a plurality of first individual flow paths extending from the third flow path to the plurality of pressure chambers, Each of the plurality of first individual flow paths has, midway along the extension from the third flow path to the pressurizing chamber, a portion having a cross-sectional area smaller than a cross-sectional area of ​​a portion of the first individual flow path extending from the third flow path and a cross-sectional area of ​​a portion of the first individual flow path extending from the pressurizing chamber.

5. The liquid ejection head according to claim 1.

6. The first flow path member has a plurality of second individual flow paths extending from the plurality of pressure chambers to the fourth flow path, Each of the second individual flow paths has, midway along the path extending from the pressure chambers to the fourth flow path, a portion having a cross-sectional area smaller than a cross-sectional area of ​​a portion of the second individual flow path extending from the fourth flow path.

6. The liquid ejection head according to claim 1.

7. The first flow path member is a plurality of the third flow paths extending in parallel to one another in a plan view perspective of the second surface; a plurality of openings that are open to the second surface and communicate with the plurality of third flow paths; The first flow path has a groove extending along the plurality of openings on a surface overlapping the second surface of the second flow path member.

7. The liquid ejection head according to claim 1.

8. A pressure member is provided, The second flow path member has a recess on a third surface on the side of the first flow path member, and the pressing member is positioned in the recess. The liquid ejection head according to any one of claims 1 to 7.

9. In a planar perspective view of the second surface, the pressure member and the recess extend across the plurality of pressure chambers. The liquid ejection head according to claim 8 .

10. In a planar perspective view of the second surface, the pressure member and the recessed portion extend over the plurality of pressure chambers, including two or more pressure chambers aligned in a first direction and two or more pressure chambers aligned in a second direction intersecting the first direction. The liquid ejection head according to claim 9 .

11. The second flow path member has a fourth surface opposite to the first flow path member, and a raised portion overlapping the entire recess in a plan view of the fourth surface. The liquid ejection head according to any one of claims 8 to 10.

12. The second flow path member is a through hole communicating with the third flow path via the first flow path; a through hole communicating with the fourth flow path via the second flow path; The liquid ejection head according to any one of claims 1 to 11.

13. The first flow path, the third flow path, the plurality of pressure chambers, the fourth flow path, and the second flow path are configured to form a circulation flow path that passes through them in order. The liquid ejection head according to any one of claims 1 to 12.

14. The second flow path member is injection molded. The liquid ejection head according to any one of claims 1 to 13.

15. A first flow path member constructed by stacking a plurality of plates and having a first surface, a second surface opposite to the first surface, a plurality of discharge holes opening into the first surface, a third flow path, a plurality of pressure chambers communicating with the third flow path and the plurality of discharge holes, and a fourth flow path; a second flow path member overlapping the second surface via an adhesive; Equipped with The second flow path member is a first flow path that communicates with the third flow path and is in contact with a resin; a second flow path communicating with the third flow path via the fourth flow path; Liquid ejection head.

16. A pressure member is provided, The plurality of pressure chambers are arranged in a plurality of rows along the second surface, the pressure member overlaps the second surface across the plurality of rows and across two or more pressure chambers in each row, the second flow path member has a recessed portion on a third surface on the second surface side of the first flow path member, the recessed portion extending across the plurality of rows and across two or more pressurizing chambers in each row, and the pressurizing member is positioned in the recessed portion; the first flow path and the second flow path extend along the second surface, The first flow path and the second flow path do not overlap each other in a plan view. The liquid ejection head according to any one of claims 1 to 15.

17. A pressure member is provided, The plurality of pressure chambers are arranged in a plurality of rows along the second surface, the pressure member overlaps the second surface across the plurality of rows and across two or more pressure chambers in each row, the second flow path member has a recessed portion on a third surface on the second surface side of the first flow path member, the recessed portion extending across the plurality of rows and across two or more pressurizing chambers in each row, and the pressurizing member is positioned in the recessed portion; The first flow path member has a plurality of first individual flow paths extending from the third flow path to the plurality of pressurizing chambers, and a plurality of second individual flow paths extending from the plurality of pressurizing chambers to the fourth flow path. The liquid ejection head according to any one of claims 1 to 16.

18. A pressure member is provided, The plurality of pressure chambers are arranged in a plurality of rows along the second surface, the pressure member overlaps the second surface across the plurality of rows and across two or more pressure chambers in each row, the second flow path member has a recessed portion on a third surface on the second surface side of the first flow path member, the recessed portion extending across the plurality of rows and across two or more pressurizing chambers in each row, and the pressurizing member is positioned in the recessed portion; the first flow path and the second flow path extend along the second surface, In the second flow path member, a portion constituting the first flow path, a portion constituting the second flow path, and a portion constituting the recess are integrally injection molded. The liquid ejection head according to any one of claims 1 to 17.

19. A liquid ejection head according to any one of claims 1 to 18, a conveying unit that conveys a recording medium to the liquid ejection head; a control unit for controlling the liquid ejection head; A recording device comprising:

Images