Liquid ejection head and recording apparatus

Abstract

SOLUTION: To provide a liquid discharge head 2 which includes a first flow channel member 4 having a first surface 4-1, a plurality of discharge holes provided on the first surface 4-1, a plurality of pressurization chambers communicating with each of the plurality of discharge holes, and a second surface 4-2 positioned opposite to the first surface 4-1, a pressurization member provided on the second surface 4-2, a second flow channel member 6 having a third surface 6-3 joined to a region of the second surface 4-2 where the pressurization member is not arranged and a through hole 6b communicating with the plurality of pressurization chambers, and a housing mounted on an opposite side to the third surface 6-3, wherein the through hole 6b is opened on an opposite side to the third surface 6-3 and outside the housing, of the second flow channel member 6.EFFECT: A leaked liquid is prevented from flowing into a liquid discharge head 2. Sealing properties of a first flow channel member 4 and a second flow channel member 6 can be improved.SELECTED DRAWING: Figure 8

Description

[Technical Field]

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

[0002] Conventionally, liquid ejection heads that perform various printing operations by ejecting liquid onto a recording medium have been known as printing heads. One such liquid ejection head includes a first flow path member having a first surface, a plurality of ejection holes provided in the first surface, a plurality of pressure chambers each communicating with the plurality of ejection holes, and a second surface located opposite the first surface; a pressure member provided on the second surface; and a second flow path member having a third surface, a fourth surface located opposite the third surface, a protruding portion protruding from the fourth surface, and a first through hole provided in the protruding portion. This prevents liquid supplied to the second flow path member from flowing into the interior through the first through hole (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-162192 Summary of the Invention

[0004] The liquid ejection head of the present disclosure comprises a first flow path member having a first surface, a plurality of ejection holes provided on the first surface, a plurality of pressure chambers each communicating with the plurality of ejection holes, and a second surface located on the opposite side of the first surface; a pressure member provided on the second surface; a third surface joined to an area of the second surface where the pressure member is not located, and a second flow path member having through holes communicating with the plurality of pressure chambers; and a housing placed on the opposite side of the second flow path member from the third surface, wherein the through holes open on the opposite side of the second flow path member from the third surface and outside the housing.

[0005] The recording apparatus of the present disclosure is characterized by including the liquid ejection head, a transport unit that transports a recording medium to the liquid ejection head, and a control unit that controls the liquid ejection head. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1A is a side view that schematically shows a recording apparatus that includes a liquid ejection head according to a first embodiment, and FIG. 1B is a plan view that schematically shows the recording apparatus shown in FIG. [Figure 2] FIG. 1 is an exploded perspective view of a liquid ejection head according to a first embodiment. [Figure 3] 3(a) is a perspective view of the liquid ejection head of FIG. 2, and FIG. 3(b) is a cross-sectional view taken along line IIIb-IIIb of FIG. 3(a). [Figure 4] 1(a) is an exploded perspective view of the head body, and FIG. 1(b) is a perspective view of the second flow path member as seen from the third surface side. [Figure 5] FIG. 1(a) is a plan view of the second flow path member and the actuator substrate, and FIG. 1(b) is a bottom view of the first flow path member and the actuator substrate. [Figure 6] FIG. 6 is an enlarged plan view of a part of FIG. 5. [Figure 7] 7(a) is an enlarged plan view of a part of FIG. 6, and FIG. 7(b) is a cross-sectional view taken along line VIIb-VIIb in FIG. 7(a). [Figure 8] FIG. 2(a) is a plan view of a second flow path member, and FIG. 2(b) is an enlarged cross-sectional view of the liquid ejection head. [Figure 9] 10A shows a liquid ejection head according to a second embodiment, where FIG. 10A is a perspective view of the second flow path member from the third surface side, and FIG. 10B is a cross-sectional view showing an enlarged portion of the liquid ejection head according to the second embodiment. [Figure 10] FIG. 10 is a perspective view showing a liquid ejection head according to a third embodiment, as viewed from the third surface side of a second flow path member. [Figure 11] 11(a) is an enlarged plan view showing a part of a liquid ejection head according to a third embodiment, and FIG. 11(b) is a cross-sectional view taken along line XIb-XIb in FIG. 11(a). DETAILED DESCRIPTION OF THE INVENTION

[0007] First Embodiment A color inkjet printer 1 (hereinafter referred to as printer 1) including a liquid ejection head 2 according to a first embodiment will be described using Figure 1. The drawing shows 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 on one side of the direction in which the first common flow path 20 and the second common flow path 24 extend, and the fourth direction D4 is on the other side of the direction in which the first common flow path 20 and the second common flow path 24 extend. The second direction D2 is on one side of the direction in which the first unified flow path 22 and the second unified flow path 26 extend, and the fifth direction D5 is on the other side of the direction in which the first unified flow path 22 and the second unified flow path 26 extend. The third direction D3 is on one side of a direction perpendicular to the extension direction of the first integrated flow path 22 and the second integrated flow path 26, and the sixth direction D6 is on the other side of a direction perpendicular to the extension direction of the first integrated flow path 22 and the second integrated flow path 26.

[0008] The printer 1 transports the recording medium P from transport roller 74a to transport roller 74b, thereby moving the recording medium P relative to the liquid ejection head 2. The control unit 76 controls the liquid ejection head 2 based on image and character data to eject liquid toward the recording medium P and cause droplets to land on the recording medium P, thereby printing on the recording medium P.

[0009] In this embodiment, the liquid ejection head 2 is fixed to the printer 1, which is a so-called line printer. Another embodiment of the recording apparatus is a so-called serial printer.

[0010] A flat head mounting frame 70 is fixed to the printer 1 so as to be approximately 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 make up one head group 72, and the printer 1 has four head groups 72.

[0011] The liquid ejection heads 2 have an elongated shape that is long and narrow from the second direction D2 to the fifth direction D5. In one head group 72, three liquid ejection heads 2 are aligned along the second direction D2 to the fifth direction D5, and the other two liquid ejection heads 2 are aligned at positions offset in the sixth direction D5. Adjacent liquid ejection heads 2 are arranged so that the printable ranges of each liquid ejection head 2 are connected from the second direction D2 to the fifth direction D5, or so that their edges overlap, enabling printing without gaps in the width direction of the recording medium P.

[0012] The four head groups 72 are arranged in 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 ink of the same color, and the four head groups print with four colors of ink. The colors of ink ejected from each head group 72 are, for example, magenta (M), yellow (Y), cyan (C), and black (K).

[0013] The number of liquid ejection heads 2 mounted on the printer 1 may be one if printing is performed in a single color within the printable range of one liquid ejection head 2. The number of liquid ejection heads 2 included in a head group 72, or the number of head groups 72, can be changed as appropriate depending on the object to be printed and the printing conditions. For example, the number of head groups 72 may be increased to print in more colors. Furthermore, by arranging multiple head groups 72 that print in the same color and printing alternately in the transport direction, the printing speed, i.e., the transport speed, can be increased. Furthermore, multiple head groups 72 that print in 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, in order to treat the surface of the recording medium P, a liquid such as a coating agent may be printed.

[0015] The printer 1 prints on a recording medium P. The recording medium P is wound around a transport roller 74a, passes between two transport rollers 74c, and then passes below the liquid ejection head 2 mounted on the head mounting frame 70. It then passes between two transport rollers 74d and is finally collected by the transport roller 74b.

[0016] The recording medium P may be, in addition to printing paper, cloth, or the like. Furthermore, the printer 1 may be configured to transport a conveyor belt instead of the recording medium P, and the recording medium P may be, in addition to a roll, a sheet of paper, cut cloth, wood, or tile placed on the conveyor belt. Furthermore, a liquid containing conductive particles may be ejected from the liquid ejection head 2 to print a wiring pattern for an electronic device. Furthermore, a chemical agent may be produced by ejecting a predetermined amount of liquid chemical agent or a liquid containing a chemical agent from the liquid ejection head 2 into a reaction vessel or the like, and causing a reaction.

[0017] Furthermore, the printer 1 may be equipped with position sensors, speed sensors, temperature sensors, etc., and the control unit 76 may control each part of the printer 1 according to the state of each part of the printer 1 determined from information from each sensor. In particular, if the ejection characteristics, such as the ejection volume and ejection speed, of the liquid ejected from the liquid ejection head 2 are affected by external factors, the drive signal that causes the liquid ejection head 2 to eject the liquid may be changed according to the temperature of the liquid ejection head 2, the temperature of the liquid in the liquid tank, or the pressure that the liquid in the liquid tank applies to the liquid ejection head 2.

[0018] Next, the liquid ejection head 2 according to the first embodiment will be described with reference to Figures 2 to 8. In Figures 5 to 7, for ease of understanding, flow paths and the like that are located below other components and should be drawn with dashed lines are drawn with solid lines.

[0019] 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 liquid ejection head 2 has a signal transmission member 60 extending from the head main body 2a, and the signal transmission member 60 is electrically connected to a wiring board 54. The signal transmission member 60 is provided with a driver IC 62 that controls the driving of the liquid ejection head 2. The driver IC 62 is pressed against the heat sink 52 by a pressing member 56 via an elastic member 58. Note that a support member that supports the wiring board 54 is not shown in the illustration.

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

[0022] The housing 50 is placed on the head main body 2a, and the housing 50 and the heat sink 52 cover the components that make up the liquid ejection head 2. The housing 50 has openings 50a, 50b, and 50c, and a heat insulating portion 50d.

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

[0024] The heat insulating portion 50d is provided to extend from the second direction D2 to the fifth direction D5, and is disposed between the heat sink 52 and the head main body 2a. This makes it difficult for the heat radiated to the heat sink 52 to be transferred to the head main body 2a. The housing 50 can be formed from a metal, an alloy, or a resin.

[0025] As shown in FIG. 4(a), the head main body 2a has an elongated 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 area E indicated by the dashed line 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 includes a plurality of displacement elements 48 (see FIG. 7(b)). The piezoelectric actuator substrate 40 having the displacement elements 48 that pressurize the pressure chambers 10 is a pressure member, and the pressure member will be described below 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. Furthermore, 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 located at the end of the second surface 4-2 in the third direction D3. The openings 24a are arranged along the second direction D2 to the fifth direction D5 and are located at the end of the second surface 4-2 in the sixth direction D6.

[0028] The second flow path member 6 has a flow path formed therein, and guides liquid supplied from an externally provided liquid tank 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 bonded to the first flow path member 4 via an adhesive (not shown) outside the mounting area E of the piezoelectric actuator substrate 40 indicated by the dashed line. This allows the first flow path member 4 and the second flow path member 6 to communicate with each other.

[0030] 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 disposed outside the mounting area E of the piezoelectric actuator substrate 40. A signal transmission member 60 is inserted through the first through holes 6a.

[0031] The through-hole 6b is disposed at an 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 disposed at an 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 housed in the space formed by the first opening 6d and the first flow path member 4.

[0032] The opening 22a 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 22a is formed at an 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 is sealed by the first flow path member 4 to form the first shared flow path 22.

[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 an 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, and is sealed by the first flow path member 4, thereby forming the second integrated flow path 26.

[0034] The first unified flow path 22 is formed 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 unified flow path 26 is formed 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 positioned higher than the fourth surface 6-4. The first through-holes 6a are provided in the raised portion 6e, and the height of the surface on which the first through-holes 6a are formed is higher than the fourth surface 6-4 on which the through-holes 6b and 6c are formed. As a result, even if liquid leaks onto the fourth surface 6-4 from the through-holes 6b and 6c, the first through-holes 6a are provided in the raised portion 6e, making it difficult for the leaked liquid to flow into the interior through the first through-holes 6a. The raised portion 6e can have a height of 1 to 5 mm, and a height of 1 mm or more makes it difficult for liquid to flow in through the first through-holes 6a.

[0036] The connecting portions 6f are provided to connect adjacent first through holes 6a and are formed to extend from the second direction D2 to the fifth direction D5. By providing the connecting portions 6f, the piezoelectric actuator substrate 40 is covered by the connecting portions 6f, making it difficult for liquid to adhere to the piezoelectric actuator substrate 40 located in the first openings 6d.

[0037] Furthermore, since the first through holes 6a are connected to each other by the connecting portions 6f, the rigidity of the second flow path member 6 can be increased, and the second flow path member 6 becomes less likely to deform.

[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 via the openings 20a and 22a, and 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 via the openings 24a and 26a, and is recovered to the outside via the through-hole 6c.

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

[0040] The first flow path member 4 is formed by stacking multiple 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 discharge holes 8 provided in the first surface 4-1. The multiple plates 4a to 4g can be made of metal, alloy, or resin. The first flow path member 4 may also be formed integrally from resin without stacking the multiple plates 4a to 4g.

[0041] The first flow path member 4 has a plurality of first common flow paths 20, a plurality of second common flow paths 24, and a plurality of individual units 15 formed therein, and has openings 20a and 24a 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 so as to communicate with the opening 20a. Furthermore, a plurality of first common flow paths 20 are arranged in 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 so as to communicate with the opening 24a. Furthermore, a plurality of second common flow paths 24 are arranged from the second direction D2 to the fifth direction D5 and are disposed between adjacent first common flow paths 20. Therefore, the first common flow paths 20 and the second common flow paths 24 are disposed alternately from the second direction D2 to the fifth direction D5.

[0044] The discharge units 15 are provided between adjacent first common flow paths 20 and second common flow paths 24, and are 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 larger than a right angle. Therefore, the discharge units 15 connected to the same first common flow path 20 are arranged offset in the second direction D2, allowing printing to be performed so that a predetermined range is filled with pixels formed by the discharged 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 imaginary straight line R, and the ejection holes 8 are arranged at intervals of 360 dpi within the imaginary straight line R. As a result, if printing is performed by transporting the recording medium P in a direction perpendicular to the imaginary straight line R, printing can be performed at a resolution of 360 dpi.

[0046] 7, the discharge unit 15 has a discharge hole 8, a pressure chamber 10, a first individual flow path 12, and a second individual flow path 14. In the liquid discharge head 2, the liquid is supplied from the first individual flow path 12 to the pressure chamber 10, and the liquid is collected from the pressure chamber 10 by the second individual flow path 14.

[0047] The pressure chamber 10 has a pressure chamber main body 10a and a partial flow path 10b. The pressure chamber main body 10a has a circular shape in a 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 pressurizing chamber body 10a has a right cylindrical shape and a circular planar shape. The circular planar shape allows for a large displacement amount and a large change in the volume of the pressurizing chamber 10 caused by the displacement.

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

[0050] The partial flow path 10b may have a conical or trapezoidal conical shape whose cross-sectional area decreases toward the discharge hole 8. This increases the flow path resistance of the first common flow path 20 and the second common flow path 24, thereby reducing the difference in pressure loss.

[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 lined up on both sides thereof are connected via first individual flow paths 12. In addition, 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 lined up on both sides thereof are connected via second individual flow paths 14.

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

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

[0054] With the above-described configuration, in the first flow path member 4, the liquid supplied to the first common flow path 20 via the opening 20a flows into the pressure chamber main body 10a via the first individual flow paths 12 and is supplied to the partial flow paths 10b, with some of the liquid being ejected from the ejection holes 8. The remaining liquid is then recovered from the partial flow paths 10b to the second common flow path 24 via the second individual flow paths 14, and is then recovered from the first flow path member 4 to the second flow path member 6 via the opening 24a.

[0055] A piezoelectric actuator substrate 40 including displacement elements 48 is bonded to the upper surface of the first flow path member 4, and each displacement element 48 is arranged so as to be located above a pressure chamber 10. The piezoelectric actuator substrate 40 occupies an area having substantially the same shape as the pressure chamber group formed by the pressure chambers 10. In addition, the opening of each pressure chamber 10 is closed by bonding 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 consisting of two piezoelectric ceramic layers 40a and 40b, each of which has a thickness of approximately 20 μm. Each of the piezoelectric ceramic layers 40a and 40b extends across multiple pressure chambers 10.

[0057] These piezoelectric ceramic layers 40a and 40b are made of, for example, ferroelectric materials such as lead zirconate titanate (PZT), NaNbO3, BaTiO3, (BiNa)NbO3, BiNaNb5O 15 The piezoelectric ceramic layer 40b acts as a vibration plate and is not necessarily a piezoelectric material, and other ceramic layers or metal plates that are not piezoelectric may be used instead.

[0058] A common electrode 42, individual electrodes 44, and connection electrodes 46 are formed on the piezoelectric actuator substrate 40. The common electrode 42 is formed over almost the entire surface in the plane direction in the region between the piezoelectric ceramic layer 40a and the piezoelectric ceramic layer 40b. The individual electrodes 44 are disposed on the upper surface of the piezoelectric actuator substrate 40 at positions facing the pressure chambers 10.

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

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

[0061] The individual electrode 44 is made of a metal material such as an Au-based material, and includes an individual electrode body 44a and an extraction electrode 44b. As shown in Fig. 7(a), the individual electrode body 44a is formed in a substantially circular shape in a plan view and is smaller than the pressure chamber body 10a. The extraction electrode 44b is extracted from the individual electrode body 44a, and a connection electrode 46 is formed on the extracted extraction electrode 44b.

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

[0063] Next, the liquid ejection operation will be described. The displacement elements 48 are displaced by a drive signal supplied to the individual electrodes 44 via the driver IC 62 under the control of the control unit 76. As a driving method, so-called pull-and-shoot 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 Figure 8. Note that in Figure 8(b), the signal transmission member 60 is not shown.

[0065] The first flow path member 4 and the second flow path member 6 are connected with an epoxy 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 serving as joining surfaces.

[0066] The second flow path member 6 has a first integrated flow path 22 and a second integrated flow path 26 formed therein, and the following description will use the first integrated flow path 22 and the second integrated flow path 26 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 to protrude 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 fourth surface 6-4 of the second flow path member 6 in the second direction D2, the fifth direction D5, the third direction D3, and the sixth direction D6. In plan view, the outer periphery 7a of the raised portion 6e is located more inward than the outer periphery 7b of the fourth surface 6-4. In addition, the outer periphery of the first opening 6d is located more inward than the outer periphery 7a of the raised portion 6e.

[0069] A method for connecting the first flow path member 4 and the second flow path member 6 will now be described. First, adhesive is applied to the third surface 6-3 of the second flow path member 6, and the second flow path member 6 is aligned and superimposed on the second surface 4-2 of the first flow path member 4. Next, a predetermined jig is used to press the fourth surface 6-4 of the second flow path member 6, connecting the first flow path member 4 and the second flow path member 6. Next, while the second flow path member 6 is being pressed, a predetermined amount of heat is applied to harden 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, because the raised portion 6e protrudes from the fourth surface 6-4, it is necessary to press both the fourth surface 6-4 and the upper surface of the raised portion 6e simultaneously in order to connect the first flow path member 4 and the second flow path member 6. However, the fourth surface 6-4 and the raised portion 6e are at different heights, and it may not be possible to press them 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, which may result in poor sealing of the joint surface between the first flow path member 4 and the second flow path member 6.

[0071] In contrast, in the liquid ejection head 2, 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. 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 joining surfaces of the first flow path member 4 and the second flow path member 6. This improves the sealing performance between the first flow path member 4 and the second flow path member 6.

[0072] In other words, 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, thereby improving the sealing ability 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.

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

[0074] Furthermore, the fourth surface 6-4 has a first portion 6-4a formed flush with the first integrated flow path 22 and the second integrated flow path 26. In other words, the fourth surface 6-4 has a first portion 6-4a formed flat with the first integrated flow path 22 and the second integrated flow path 26. This allows the pressing force generated when pressing the second flow path member 6 to be applied uniformly to the first portion 6-4a provided on the fourth surface 6-4. As a result, the second flow path member 6 positioned between the first portion 6-4a and the openings 22a and 26a is less likely to deform, and the first integrated flow path 22 and the second integrated flow path 26 are less likely to deform.

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

[0076] Furthermore, the fourth surface 6-4 is formed flush with the second portion 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. In other words, the fourth surface 6-4 is formed flat with the second portion 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. This allows the joining surfaces of the first flow path member 4 and the second flow path member 6 corresponding to the second portion 6-4b to be pressed with a uniform pressing force, thereby improving the sealing performance between the first flow path member 4 and the second flow path member 6.

[0077] In other words, by directly pressing the second portion 6-4b against the bonding surface between the first flow path member 4 and the second flow path member 6, which serves as the adhesive margin, a uniform pressing force can be applied to the bonding surface between the first flow path member 4 and the second flow path member 6, thereby improving the sealing ability between the first flow path member 4 and the second flow path member 6.

[0078] In particular, in the case of the second flow path member 6 that is formed long from the second direction D2 to the fifth direction D5, warping or deflection may occur in the second flow path member 6 from the second direction D2 to the fifth direction D5. In contrast, in the liquid ejection head 2, the second portion 6-4b is formed flush, so that the second portion 6-4b can be firmly pressed, and the sealing performance between the first flow path member 4 and the second flow path member 6 can be improved.

[0079] Furthermore, the second flow path member 6 has a first opening 6d provided on its fourth surface 6-4. The piezoelectric actuator substrate 40 is housed 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. This allows a uniform pressing force to be applied to the bonding 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 placed in the space, the piezoelectric actuator substrate 40 can be sealed, reducing the possibility of damage to the liquid ejection head 2.

[0080] In addition, the fourth surface 6-4, the first portion 6-4a, the second portion 6-4b, and the third portion 6-4c being formed flush means that the fourth surface 6-4, the first portion 6-4a, the second portion 6-4b, and the third portion 6-4c are formed flat, respectively, and the flatness is 0.3 or less.

[0081] Furthermore, the second flow path member 6 has connecting portions 6f that connect adjacent first through holes 6a. Therefore, the reduction in rigidity caused by the provision of the first through holes 6a can be increased by the connecting portions 6f, making the second flow path member 6 less likely to deform. 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, by arranging the connecting portion 6f 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 onto the piezoelectric actuator substrate 40.

[0083] Furthermore, the signal transmission member 60 is drawn upward while 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, the signal transmission member 60 can be easily drawn upward, and the productivity of the liquid ejection head 2 can be improved.

[0084] Although the liquid ejection head 2 has been described as having a plurality of first through holes 6a, the present invention is not limited to this. The liquid ejection head 2 may have only one first through hole 6a.

[0085] <Second embodiment> A liquid ejection head 102 according to the second embodiment will be described with reference to Figure 9. Note that the same components 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 sink 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 toward the third surface 106-3, and a second opening 106g that opens toward the third surface 106-3. The second opening 106g is provided in communication with the first opening 106d.

[0087] The connecting portion 106f has a second opening 106g that opens to the third surface 106-3 side. This makes it possible to reduce the weight of the second flow path member 106 while ensuring the rigidity of the second flow path member 106. This is particularly useful when the liquid ejection head 102 is used in a serial printer.

[0088] In addition, the partition wall 106 between the first through-hole 106a and the second opening 106g of the connecting portion 106f h The width of the partition wall 22b of the first shared channel 22 and the width of the partition wall 26b of the second shared channel 26 are equal to each other.

[0089] As a result, when the second flow path member 106 is manufactured by injection molding, the partition wall 106 between the first through-hole 106a of the connecting portion 106f and the second opening 106g h This makes it possible to make the resin filling speeds of the partition walls 22b of the first shared flow channel 22 and the partition walls 26b of the second shared flow channel 26 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 channel 22, and the partition wall 26b of the second integrated channel 26, and a second channel member 106 that is less likely to deform can be provided.

[0091] In addition, the partition wall 106 h , 22b, 26b being equal in thickness includes manufacturing tolerances and is a concept that includes 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 located outside the raised portion 106e. Therefore, compared to when 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 made smaller.

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

[0094] Furthermore, 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 while 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 insulating portion 150d is pressed by the second flow path member 106, the elastic member 9 is elastically deformed, thereby reducing the possibility of damage to the heat insulating portion 150d.

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

[0096] Furthermore, 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 by 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 or the fourth surface 106-4. However, because 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 unlikely to occur.

[0098] The elastic member 9 is also provided between the housing 150 and the heat sink 152. This reduces the possibility that the heat sink 152 will be damaged even if pressed by the raised portion 106e, and also improves the sealing performance of the opening 50a (see FIG. 2) of the housing 150.

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

[0100] <Third embodiment> A liquid ejection head 202 according to the third embodiment will be described with reference to FIGS.

[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 toward the third surface 206-3, a second opening 206g that opens toward the third surface 206-3, 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 to communicate with the first opening 206d and is provided apart from the second opening 206g. The third opening 206k is provided on the outer side of the second opening 206g in the second direction D2 and on the outer side of the second opening 206g in the fifth direction D5 in plan view.

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

[0105] In other words, resin flowing from the fifth direction D5 toward the second direction D2 tends to flow into the connecting portion 206f, which has a larger cross-sectional area, but the presence of the third opening 206k allows the cross-sectional area of the partition 206h of the connecting portion 206f to be closer to the cross-sectional area of the partitions 22b and 26b, thereby making the resin filling speed near the third opening 206k more uniform.

[0106] Even when the resin is filled from the second direction D2 toward the fifth direction D5, the third opening 206k is located outside the second opening 206g in the second direction D2, so that the same effect can be achieved.

[0107] Furthermore, the third opening 206k does not have to be located outside the second opening 206g in the second direction D2 or outside the fifth direction D5 when viewed in a plane, but only needs to be located upstream of the second opening 206g in the direction of resin filling.

[0108] Furthermore, in plan view, the wall constituting the third opening 206k has a recess 206j located on the opposite side from the second opening 206g. This makes it easier for the resin to flow into the connecting portion 207f than into the partition walls 22b and 22d when resin is filled from the fifth direction D5 toward the second direction D2, making it less likely that a shortage of resin will occur in the connecting portion 207f. In other words, a sufficient amount of resin can be poured into the connecting portion 207f while ensuring the amount of resin flowing into the partition walls 22b and 22b.

[0109] The second through-hole 206i is provided so as to communicate with the first opening 206d, and is provided apart 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 from the raised portion 206e of the second flow path member 206 toward the inside. The second portion 206i2 is provided from the first opening 206d of the second flow path member 206 toward the inside. The first portion 206i1 and the second portion 206i2 are provided to communicate with each other.

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

[0112] The second portion 206i2 accommodates a fixing member 28. The fixing member 28 may be, for example, a nut or the like, and is fastened with a screw inserted from the side of the raised portion 206e. This allows a member provided on the second flow path member 206 to be fixed to the second flow path member 206.

[0113] In plan view, the apex of the second portion 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 colliding with the apex, the supplied resin flows along the side of the second portion 206i2 to the partition wall 206h between the first through hole 206a and the second opening 206g. As a result, the resin can be smoothly supplied to the partition wall 206h between the first through hole 206a and the second opening 206g. Therefore, the amount of resin supplied to the partition wall 206h is less likely to be insufficient.

[0114] Note that the second portion 206i2 may have any polygonal shape in plan view, and is not limited to a rectangular shape. For example, it may have a hexagonal shape. Furthermore, the second through-hole 206i does not have to have the first portion 206i1 and the second portion 206i2, and may have a polygonal columnar shape.

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

[0116] For example, although the actuator substrate 40 has been exemplified as a pressure member, the present invention is not limited to this. For example, a heat generating portion may be provided for each pressure chamber 10, and the heat from the heat generating portion may heat the liquid inside the pressure chamber 10, thereby applying pressure by thermal expansion of the liquid.

[0117] Furthermore, the base discharge head 2 is configured to supply liquid from the through-hole 6b of the second flow path member 6 and recover the liquid that has not been discharged from the through-hole 6c, but is not limited to this. For example, it may be configured to supply liquid from the through-hole 6c of the second flow path member 6 and recover the liquid that has not been discharged from the through-hole 6b.

[0118] The following concepts can be extracted from this 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 pressurizing chambers respectively communicating with the plurality of discharge holes, and a second surface located on the opposite side of 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 opposite side of 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 pressurizing member is not disposed, A liquid ejection head, wherein, in plan view, the outer periphery of the raised portion is located inside the outer periphery of the fourth surface. (Concept 2) the second flow path member has a first flow path therein, The liquid ejection head according to Concept 1, wherein the fourth surface is formed flush with a portion located above the first flow path. (Concept 3) the second flow path member has a partition wall that forms the first flow path, The liquid ejection head according to Concept 2, wherein, in plan view, the portion of the fourth surface located on the partition wall is formed flush. (Concept 4) the second flow path member has a first opening provided on the third surface, the pressure member is accommodated in a space formed by the first opening and the first flow path member, The liquid ejection head according to any one of Concepts 1 to 3, wherein the fourth surface located outside the first opening in plan view is formed flush. (Concept 5) The liquid ejection 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 has a connecting portion that connects adjacent first through holes. (Concept 6) The liquid ejection head according to Concept 5, wherein the connecting portion has a second opening on the third surface side. (Concept 7) The liquid ejection head according to Concept 6, wherein, in plan view, the connecting portion has a third opening positioned outside the second opening. (Concept 8) The liquid ejection head according to Concept 7, wherein, in plan view, the partition wall that constitutes the third opening has a recess in a portion that is located on the opposite side to the second opening. (Concept 9) The second flow path member is formed to be long in the first direction, the connecting portion has a second through hole that accommodates a fixing member, The liquid ejection head according to Concept 8, wherein, in a plan view, the second through-hole has a polygonal shape, with a vertex positioned in the first direction. (Concept 10) the second flow path member has a first flow path therein, The liquid ejection head according to any one of Concepts 6 to 9, wherein the thickness of a partition between the first through-hole and the second opening of the connecting portion is equal to the thickness of a partition that constitutes the first flow path. (Concept 11) A liquid ejection head described in any one of Concepts 1 to 10, wherein a signal transmission member that transmits a signal to the pressure member is pulled upward while in contact with the raised portion that constitutes the first through hole. (Concept 12) The liquid ejection head according to any one of Concepts 1 to 11, further comprising a housing placed on the fourth surface. (Concept 13) 13. The liquid ejection 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 plan view. (Concept 14) 14. The liquid ejection head of claim 13, wherein the elastic member is in contact with the raised portion and the fourth surface. (Concept 15) A liquid ejection head according to any one of Concepts 1 to 14, a conveying unit that conveys a recording medium to the liquid ejection head; The recording apparatus further comprises a control unit for controlling the liquid ejection head. [Explanation of symbols]

[0119] 1. Color inkjet printer 2. Liquid ejection head 2a Head body 4... First flow path member 4a~4g... Plate 4-1...Front page 4-2...Second side 6,106,206... Second flow path member 6a,106a,206a...1st through hole 6b,6c...Through hole 6d, 106d, 206d... First opening 6e,106e,206e...ridges 6f,106f,206f...Connection part 106g,206g...2nd opening 106h,206h...Bulkhead 206i...2nd through hole 206j···Concave 206k...Third aperture 6-3,106-3,206-3...3rd page 6-4,106-4,206-4...Side 4 8...Discharge hole 10. Pressurized chamber 12 First individual flow path 14...Second individual flow path 15. Discharge unit 20...First common flow path 22... First integrated channel (first channel) 22a...Bulkhead 24...Second common flow path 26...Second integrated channel (first channel) 26a...Bulkhead 40 Piezoelectric actuator substrate (pressure member) 48... Displacement element 50... Enclosure 52...heat sink 76 Control unit P... Recording media

Claims

1. a first flow path member including a first surface, a second surface opposite to the first surface, a plurality of discharge holes opening to 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; a second flow path member that overlaps the second surface, supplies liquid to the supply flow path, and recovers the liquid from the recovery flow path, and is made of resin; A pressure member; Equipped with 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 second flow path member is a first unified flow path connected to the supply flow path and extending along the second surface; a second integrated flow path connected to the recovery flow path and extending along the second surface, The first and second combined channels do not overlap each other in a plan view. Liquid ejection head.

2. A first flow path member having a first surface, a second surface opposite to the first surface, a plurality of discharge holes opening to 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; a second flow path member that overlaps the second surface, supplies liquid to the supply flow path, and recovers the liquid from the recovery flow path, and is made of resin; A pressure member; Equipped with 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 further includes a plurality of first individual flow paths that supply the liquid from the supply flow path to the plurality of pressure chambers, and a plurality of second individual flow paths that recover the liquid from the plurality of pressure chambers to the recovery flow path. Liquid ejection head.

3. A first flow path member having a first surface, a second surface opposite to the first surface, a plurality of discharge holes opening to 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; a second flow path member that overlaps the second surface, supplies liquid to the supply flow path, and recovers the liquid from the recovery flow path, and is made of resin; A pressure member; Equipped with 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 second flow path member is injection molded, The second flow path member is a first unified flow path connected to the supply flow path and extending along the second surface; a second integrated flow path connected to the recovery flow path and extending along the second surface, In the second flow path member, a portion constituting the first integrated flow path, a portion constituting the second integrated flow path, and a portion constituting the recess are integrally injection molded. Liquid ejection head.

4. 4. The liquid ejection head according to claim 1, wherein the first flow path member includes a metal or an alloy.

5. 5. The liquid ejection head according to claim 1, wherein the first flow path member and the second flow path member contain different materials.

6. 6. The liquid ejection head according to claim 1, wherein the first flow path member includes a plurality of plates stacked on top of each other.

7. 7. The liquid ejection head according to claim 1, wherein the first flow path member and the second flow path member are bonded together.

8. a first flow path member including a first surface, a second surface opposite to the first surface, a plurality of discharge holes opening to 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; a second flow path member that overlaps the second surface, supplies liquid to the supply flow path, and recovers the liquid from the recovery flow path, and is made of resin; Equipped with the second flow path member has a longitudinal direction and a lateral direction when viewed from the first flow path member side, The second flow path member is a first integrated flow channel extending in the longitudinal direction and supplying the liquid to the supply flow channel; a slit-shaped through-hole aligned with the first combined flow path in the short-side direction and extending in the longitudinal direction; a recessed portion that is open to the first flow path member at a position opposite to the first combined flow path with respect to the through hole, The width of the partition wall between the first combined channel and the through hole is equal to the width of the partition wall between the through hole and the recess. Liquid ejection head.

9. a first flow path member including a first surface, a second surface opposite to the first surface, a plurality of discharge holes opening to 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; a second flow path member that overlaps the second surface, supplies liquid to the supply flow path, and recovers the liquid from the recovery flow path, and is made of resin; Equipped with the second flow path member has a longitudinal direction and a lateral direction when viewed from the first flow path member side, The second flow path member is a slit-shaped through hole extending in the longitudinal direction; a first recess that opens to the first flow path member side, is aligned with the through hole in the short-side direction via a partition wall, and has a length in the long-side direction that is longer than a length in the short-side direction; two second recesses that are open to the first flow path member at positions on both sides of the first recess in the longitudinal direction, and have a length in the longitudinal direction that is shorter than the length of the first recess and a depth that is deeper than the depth of the first recess; Liquid ejection head.

10. A liquid ejection head according to any one of claims 1 to 9; 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:

11. The recording apparatus according to claim 10 , further comprising a tank that supplies the liquid to the second flow path member and recovers the liquid from the second flow path member.

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