Liquid ejection head

Abstract

To provide a liquid discharge head which enables stable discharge of a liquid for a long time.SOLUTION: A liquid discharge head includes: a frame body 40, 42, 43 having multiple discharge ports 52 for discharging a liquid, a common liquid chamber 50, and multiple individual liquid chambers 53 which allow the common liquid chamber 50 to communicate with the multiple discharge ports 52; and multiple energy generating elements 51 disposed at the respective multiple individual liquid chambers 53. A part 43 of a wall of the frame body forming the common liquid chamber 50 is formed by an elastically deformable elastic member 43 so that a cubic capacity of the common liquid chamber 50 can be changed.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a liquid ejection head that ejects liquid. [Background technology]

[0002] Liquid ejection heads that eject liquid such as ink are known. In liquid ejection heads, a recording element substrate with an array of ejection ports is mounted on a support member, and liquid chambers inside the support member are connected to supply ports provided in the recording element substrate for each array of ejection ports, forming liquid flow paths from the liquid chambers to the ejection ports. In recent years, the number of ejection ports arranged in liquid ejection heads has been increasing due to demands for high-speed printing, and flow path designs that can supply liquid at large flow rates are required.

[0003] Because liquid ejection heads handle fluids such as ink, vibrations in the liquid can cause meniscus vibrations at the ejection ports, resulting in reduced ejection accuracy. Meniscus vibrations are more likely to occur in liquid ejection heads with a high density of ejection ports and a high liquid flow rate per unit time. For example, if liquid ejection from multiple ejection ports is suddenly stopped, the inertial force that moves the liquid toward the ejection ports increases. This inertial force can push the liquid inside the ejection ports, resulting in a protruding meniscus at the ejection ports. Meanwhile, liquid tanks, which serve as the liquid supply source, are generally configured to maintain negative pressure to prevent liquid dripping from the supply ports. This creates a force that pulls the liquid supplied from the liquid tank back upstream (toward the liquid tank). Therefore, the liquid in the ejection port with a protruding meniscus as described above subsequently attempts to retreat to the opposite side.

[0004] Thus, when ejection is stopped, the meniscus at the ejection port protrudes forward and retracts backward, inducing so-called meniscus vibration. This vibration increases as the liquid flow rate per unit time increases. If the next ejection is performed with the meniscus protruded forward or retracted backward, small ink droplets will scatter in the former case, while the ejection speed and ejection volume will decrease in the latter case. In either case, ejection defects such as turbulent ejection will occur. Furthermore, if liquid ejection is started simultaneously from multiple ejection ports after an ejection stop state, the liquid will start moving from a halted state. Therefore, after the first ejection of liquid, the inertial force that moves the liquid forward from the ejection port may not be strong enough to completely refill the ejection port. Therefore, if the next ejection is started with the meniscus at the ejection port retracted, ejection defects such as turbulent ejection will occur.

[0005] Patent Document 1 describes a liquid ejection head that can reduce meniscus vibration at the ejection port. The liquid ejection head described in Patent Document 1 is provided with a buffer chamber in the liquid chamber that stores gas (e.g., air bubbles). The gas in this buffer chamber absorbs and damps meniscus vibration at the ejection port. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-240150 Summary of the Invention [Problem to be solved by the invention]

[0007] As shown in Patent Document 1, when meniscus vibration at the ejection port is absorbed and damped by gas in a buffer chamber, the gas in the buffer chamber may dissolve into the liquid due to long-term liquid ejection, and the volume of the gas in the buffer chamber may decrease. This decrease reduces the ability to absorb and damp meniscus vibration, causing ejection defects. Furthermore, in a system such as that in Patent Document 1, The distance from the facility to the buffer room is long, so there is a concern that sufficient effect may not be obtained.

[0008] An object of the present invention is to provide a liquid ejection head that is capable of ejecting liquid stably over a long period of time. [Means for solving the problem]

[0009] In order to achieve the above object, the liquid ejection head of the present invention comprises: a frame having a plurality of ejection ports for ejecting liquid, a common liquid chamber, and a plurality of individual liquid chambers that connect the common liquid chamber to each of the plurality of ejection ports; a plurality of energy generating elements disposed in the plurality of individual liquid chambers; In a liquid ejection head comprising: a part of a wall of the frame that forms the common liquid chamber is formed of an elastic member that is elastically deformable so as to change the volume of the common liquid chamber; The frame body is a substrate on which the plurality of energy generating elements are mounted; a flow path forming member that is stacked on the mounting surface of the substrate for the energy generating elements and that forms a liquid flow path including the individual liquid chambers and the common liquid chamber between the substrate and the flow path forming member; an adhesion improving material laminated between the substrate and the flow path forming member; Including, The substrate is a substrate penetration portion that penetrates the substrate so as to open at the mounting surface and constitutes a part of a wall surface that forms the common liquid chamber; The flow path forming member is a recess provided on a surface facing the substrate, the recess individually covering each of the plurality of energy generating elements and being provided so as to partially face the substrate penetration portion, and forming the plurality of individual liquid chambers between the recess and the mounting surface; a plurality of through holes that open at positions in the recess that face the plurality of energy generating elements, respectively, and form the plurality of discharge ports; a wall portion provided at a position facing the substrate penetration portion and constituting a part of a wall surface that forms the common liquid chamber together with the substrate penetration portion; and A part of the wall portion is formed of the elastic member. And, The elastic member is a part of the adhesion improving material. It is characterized by: [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a liquid ejection head that is capable of ejecting liquid stably for a long period of time. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a perspective view showing a liquid ejection head according to each embodiment. [Figure 2] FIG. 2 is an exploded perspective view showing the component configuration of the liquid ejection head according to each embodiment. [Figure 3] 2 is a schematic cross-sectional view showing the internal structure of the liquid ejection head of each embodiment. FIG. [Figure 4] FIG. 2 is an exploded view of a recording element in each embodiment. [Figure 5] FIG. 2 is a schematic cross-sectional view of a recording element according to the first embodiment. [Figure 6] FIG. 2 is a schematic cross-sectional view of a recording element according to the first embodiment. [Figure 7] FIG. 10 is a schematic diagram of a recording element according to a second embodiment. [Figure 8] FIG. 10 is a schematic diagram of a recording element according to a third embodiment. [Figure 9] FIG. 10 is a schematic diagram of another example of the recording element according to the third embodiment. [Figure 10] FIG. 10 is a schematic cross-sectional view of a recording element according to a fourth embodiment. [Figure 11] FIG. 10 is a schematic cross-sectional view of a recording element according to a fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] The following describes in detail exemplary embodiments of the present invention with reference to the drawings. However, the dimensions, materials, shapes, and relative positions of the components described in the embodiments may be changed as appropriate depending on the configuration of the device to which the invention is applied and various conditions. In other words, the scope of the present invention is not limited to the following embodiments.

[0013] (Embodiment) <Outline of liquid ejection head> Fig. 1 shows an assembled state of a liquid ejection head 1 that ejects liquid such as ink in each embodiment of the present invention, and Fig. 2 shows the configuration of the liquid ejection head 1 in Fig. 1 and an exploded view before assembly. The liquid ejection head 1 described below is configured as an inkjet recording head used in an image recording device such as an inkjet printer to record a desired image on a recording material by ejecting ink as an image recording liquid onto the recording material. However, the present invention can also be suitably applied to applications other than inkjet recording heads.

[0014] First, we will explain the outline of the overall configuration of the liquid ejection head 1. The illustrated liquid ejection head 1 ejects, as the recording liquid, for example, black ink and six other colors. The black ink and the color inks are sometimes collectively referred to as recording liquid.

[0015] The liquid ejection head 1 is composed of a sub-tank unit 10, a first elastic member 11, a head main body 12, and a recording element unit 14. The first elastic member 11 is sandwiched between the sub-tank unit 10 and the head main body 12, and sealed by fastening its outer periphery with screws. The second elastic member 13 is sandwiched between the head main body 12 and the recording element unit 14, and sealed by fastening its outer periphery with screws. The recording element unit 14 is composed of a support member 31, an electric board 32, an electric wiring board 33, and recording elements 30.

[0016] 3 shows a cross section of the liquid ejection head 1 of FIG. 1 taken along line AA, and illustrates the ink supply path inside the liquid ejection head 1. Ink is supplied to the inside of the liquid ejection head 1 from an external ink tank (not shown) (for example, a liquid storage section provided in the printer body) via a joint section 21. The ink supplied to the inside of the liquid ejection head 1 passes through an ink chamber 22 and a filter 23, and reaches the recording element unit 14 via an internal flow path 24.

[0017] 4 is an exploded view showing the configuration of the recording element 30. The recording element 30 is formed by a recording element substrate 40 made of silicon (Si) and a flow path member 41 formed on the recording element substrate 40 by photolithography. In this case, the flow path member 41 is formed by a flow path forming member 42 and an adhesion improving material (adhesion improving resin layer) 43 for improving adhesion between the flow path forming member 42 and the recording element substrate 40.

[0018] Next, a manufacturing process for forming the recording element 30 will be described, but this is merely an example, and the manufacturing method for the recording element 30 in this embodiment is not necessarily limited to this process.

[0019] First, the adhesion improving material 43 is formed on the recording element substrate 40. Then, openings are formed using an exposure machine and a photomask. One example of this formation method is to use a photosensitive material for the adhesion improving material 43 and pattern it into any shape using an exposure machine and a photomask. Only the areas irradiated with light from the exposure machine harden the adhesion improving material 43, while the areas shaded by the photomask remain unhardened. Therefore, the desired shape can be formed by washing away the unhardened areas after light irradiation.

[0020] Some materials used for the adhesion improver 43 have the property of only hardening the portions not irradiated with light, but either is acceptable in this case. Any material is sufficient as long as it is elastically deformable enough to provide the buffer function described below. Next, a flow path mold is placed on the adhesion improver 43 formed into a desired shape, and then a flow path forming member 42 is placed to form the discharge port 52 and the through-hole 55. The flow path portion is then formed by removing the flow path mold with a chemical.

[0021] (First embodiment) Fig. 5 shows a cross section taken along line BB in Fig. 4, and Fig. 6 shows a cross section taken along line CC in Fig. 5. In the recording element (liquid ejection element) 30 according to this embodiment, a structure having various liquid flow paths, which will be described later, is formed by a frame body made up of a recording element substrate 40 and a flow path member 41 (a flow path forming member 42, an adhesion improving material 43).

[0022] The recording element substrate 40 is mounted with a plurality of actuators 51 as a plurality of energy generating elements. The recording element substrate 40 further has a through-hole (substrate through-hole) 405 that constitutes a part of the wall surface that forms the common liquid chamber 50, and is provided so as to penetrate the recording element substrate 40 so as to open on the mounting surface of the actuators 51. In this embodiment, the actuators 51 are electrically Although the pressure generating means is an air heat exchange element, other pressure generating means such as a piezoelectric element may also be used. The flow path forming member 42 has a plurality of ejection ports 52 at positions corresponding to the actuators 51, and also has individual liquid chambers 53 corresponding to each of the ejection ports 52. Specifically, the flow path forming member 42 has recesses 423 on its surface facing the recording element substrate 40. The recesses 423 individually cover each of the actuators 51 and are provided so as to partially face the through-holes 405 of the recording element substrate 40, thereby defining a plurality of individual liquid chambers 53 between the recesses 423 and the actuator mounting surface of the recording element substrate 40. Furthermore, a plurality of through holes 422 are provided in the recesses 423 at positions facing each of the actuators 51, and these through holes 422 form the ejection ports 52.

[0023] In addition, reference numeral 57 in FIG. 6 denotes a structural portion formed in the shape of a support pillar between the common liquid chamber 50 and each individual liquid chamber 53, and is a filter for suppressing the flow of foreign matter within the flow path.

[0024] In this embodiment, the actuators 51 are arranged in a staggered pattern with a density of 600 dpi on one side and 1200 dpi on both sides. After ink is supplied from the common liquid chamber 50 to each individual liquid chamber 53, it is ejected to the outside from the ejection openings 52 by driving the actuators 51.

[0025] The plurality of ejection ports 52 are arranged in two parallel rows (a first row of ejection ports and a second row of ejection ports) at equal intervals in the longitudinal direction of the recording element substrate 40 in this embodiment. The individual liquid chambers 53 include a first row of individual liquid chambers corresponding to the first row of ejection ports, and a second row of individual liquid chambers corresponding to the second row of ejection ports, and the flow path forming member 42 has a rib 54 as a wall portion that separates the first row of individual liquid chambers from the second row of individual liquid chambers with respect to the common liquid chamber 50. The rib 54 is provided at a position facing the common liquid chamber 50, and together with the substrate through-hole 405, constitutes part of the wall surface that forms the common liquid chamber 50.

[0026] The rib 54 is a convex portion formed so as to protrude from the recess 423 toward the substrate through-hole 405. The common liquid chamber 50 is formed extending in the longitudinal direction of the recording element substrate 40, which is parallel to the arrangement direction of the multiple actuators 51, and accordingly, the rib 54 also has a shape that extends in the longitudinal direction. In this embodiment, the rib 54 extends from one end to the other end in the longitudinal direction of the flow path forming member 42, and has a width W1 of 60 μm and a depth H of 16 μm.

[0027] The rib 54 further has a through-hole 55 as a protruding portion through-hole. This through-hole 55 opens at the tip of the rib 54 and, in this embodiment, is provided so as to extend in the longitudinal direction of the rib 54. In this embodiment, the width W2 of the through-hole 55 is 45 μm. In addition, a part 43 a of the adhesion improving material 43, which serves as an elastic member, is in close contact with the tip surface of the rib 54 facing the common liquid chamber 50 so as to close the opening of the through-hole 55.

[0028] This adhesion improving material 43a is a part of the adhesion improving material 43 that is exposed to the space (common liquid chamber 50) due to the formation of the substrate through-hole 405 during the manufacturing process of the recording element 30. However, the method for forming the adhesion improving material 43a is not limited to this, and it may be provided by bonding later.

[0029] The adhesion improving material 43 is 2 μm thick and elastic, and can deform when the pressure inside the common liquid chamber 50 changes relative to atmospheric pressure. In other words, it is configured to be elastically deformable so that the volume of the common liquid chamber 50 can be changed. Even if ink is momentarily discharged to the outside from the ejection port 52 and the pressure inside the common liquid chamber 50 transiently decreases relative to atmospheric pressure, the adhesion improving material 43 deforms and functions as a buffer, preventing deterioration of print quality. This buffer function to compensate for the transient decrease in ink supply capacity at the start of ejection is In this embodiment, a configuration having this function is provided on the rib 54, which is the branching point where ink supplied from the common liquid chamber 50 is supplied to each individual liquid chamber 53. This allows the buffer function to be evenly provided to each individual liquid chamber 53. Also, because the buffer function is provided closer to the individual liquid chamber 53 than in conventional configurations, a greater buffer effect can be expected. Furthermore, because the configuration does not have bubbles in the flow path, a sustained buffer effect that does not change over time can be obtained.

[0030] That is, according to this embodiment, stable liquid ejection is possible over the long term. Furthermore, according to this embodiment, ejection defects caused by momentary supply shortages can be prevented even in systems with multiple nozzles and high flow rates. Furthermore, bubbles accumulated in the buffer section are not washed away by the ink flow, and printing problems caused by bubbles flowing into and being held in the nozzles do not occur.

[0031] (Second embodiment) A second embodiment of the present invention will be described with reference to Fig. 7. In the second embodiment, the same components as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, and detailed descriptions thereof will be omitted. Matters in the second embodiment that will not be particularly described here are the same as those in the first embodiment.

[0032] 7 is a schematic cross-sectional view of a recording element according to the second embodiment. In the second embodiment, the through-holes 55b (openings) are configured to be intermittently provided from one end to the other in the longitudinal direction in which the ribs 54 extend. In other words, they are configured to be divided along the longitudinal direction. With this configuration, the adhesive surface between the ribs 54 and the adhesion improving material 43 is increased, and therefore higher durability can be expected.

[0033] (Third embodiment) A third embodiment of the present invention will be described with reference to Figures 8 and 9. In the third embodiment, the same components as those in the above embodiment are designated by the same reference numerals as those in the above embodiment, and detailed description thereof will be omitted. Matters in the third embodiment that are not particularly described here are the same as those in the above embodiment.

[0034] FIG. 8 is a schematic cross-sectional view of a recording element according to a third embodiment, and FIG. 9 is a schematic cross-sectional view of another example of a recording element according to the third embodiment. In this embodiment, a plurality of through-holes (openings) are provided so as to be spaced apart and parallel to each other in a direction perpendicular to the longitudinal direction. More specifically, the ribs 54 are designed to be thicker, and two rows of through-holes 55c are provided in the longitudinal direction of the ribs 54. This configuration increases the area of ​​the adhesion improving material 43 with buffering function, thereby improving the buffering function. Furthermore, the distance between the individual liquid chambers 53 and the adhesion improving material 43 with buffering effect is further reduced, thereby further enhancing the buffering effect. The number of rows of through-holes may be three or more.

[0035] 9, two rows of through-holes (openings) may be provided so as to be separated intermittently in the longitudinal direction of the rib 54. This configuration increases the contact area between the rib 54 and the adhesion improving material 43, thereby providing greater durability. Furthermore, as shown in FIG. 9, two rows of through-holes 55 (openings) may be arranged in a staggered manner, that is, the positions in the longitudinal direction of through-holes 55 (openings) adjacent to each other in a direction perpendicular to the longitudinal direction may be shifted from each other.

[0036] (Fourth embodiment) A fourth embodiment of the present invention will be described with reference to Fig. 10. In the fourth embodiment, the same components as those in the above embodiment are designated by the same reference numerals as those in the above embodiment, and detailed description thereof will be omitted. Matters in the fourth embodiment that are not particularly described here are the same as those in the above embodiment.

[0037] FIG. 10 is a schematic cross-sectional view of a recording element according to the fourth embodiment, and (a) is CC in FIG. 5A and 5B are cross-sectional views corresponding to the cross section, and (b) is a DD cross-sectional view of (a). In this embodiment, a communication port 56 that communicates with the atmosphere is provided only in a portion of the through-section 55 provided in the rib 54. The communication port 56 opens to the upper surface of the flow path forming member 42e (the surface opposite to the surface that is laminated on the recording element substrate 40), and partially opens the through-section 55 to the atmosphere. There may be multiple communication ports 56.

[0038] The communication holes 56 are formed in the same manner as the discharge holes 52. By forming a plurality of communication holes 56, it is possible to prevent the mold material from remaining when forming the through-holes 55. This configuration makes it possible to prevent foreign matter from clogging the through-holes 55 and reducing the buffer function. It is also possible to prevent the adhesion improving material 43 from being damaged by wiping or the like and reducing the buffer function.

[0039] (Fifth embodiment) A fifth embodiment of the present invention will be described with reference to Fig. 11. In the fifth embodiment, the same components as those in the above embodiment are designated by the same reference numerals as those in the above embodiment, and detailed description thereof will be omitted. Matters in the fifth embodiment that are not particularly described here are the same as those in the above embodiment.

[0040] 11 is a schematic cross-sectional view of a recording element according to a fifth embodiment. In this embodiment, a step is provided at the opening of a through-hole 55 provided at the tip of a rib 54. More specifically, the tip of the rib 54 has a bonding surface 54a to which the adhesion improving material 43 is bonded and a concave surface 54b that is recessed relative to the bonding surface 54a in a direction away from the substrate through-hole 405, and the through-hole 55 is provided so as to open at the concave surface 54b. According to this embodiment, the step can suppress deformation of the adhesion improving material 43 in a direction toward the through-hole 55. However, it does not suppress deformation in a direction toward the common liquid chamber 50.

[0041] According to this embodiment, deformation of the adhesion improving material 43 is suppressed even when filling the liquid ejection head with ink or when performing a recovery operation to suck out ink to improve printing defects. This suppresses the force applied to the contact surface between the rib 54 and the adhesion improving material 43, thereby improving the durability of the buffer function. Note that the number of steps may be two or more.

[0042] The configurations of the above-described embodiments can be combined with each other as long as no technical contradiction occurs. [Explanation of symbols]

[0043] 1...liquid ejection head, 10...subtank unit, 14...printing element unit, 22...ink chamber, 30...printing element, 31...support member, 32...electrical board, 33...electrical wiring board, 40...printing element board, 41...flow path portion, 42...flow path forming member, 43...adhesion improving material, 50...common liquid chamber, 51...actuator (energy generating element), 52...ejection port, 53...individual liquid chamber, 54...rib (convex portion), 55...through portion, 56...communicating port

Claims

1. a frame having a plurality of ejection ports for ejecting liquid, a common liquid chamber, and a plurality of individual liquid chambers that connect the common liquid chamber to each of the plurality of ejection ports; a plurality of energy generating elements disposed in the plurality of individual liquid chambers; In a liquid ejection head comprising: a part of a wall of the frame that forms the common liquid chamber is formed of an elastic member that is elastically deformable so as to change the volume of the common liquid chamber; The frame body is a substrate on which the plurality of energy generating elements are mounted; a flow path forming member that is stacked on the mounting surface of the substrate for the energy generating elements and that forms a liquid flow path including the individual liquid chambers and the common liquid chamber between the substrate and the flow path forming member; an adhesion improving material laminated between the substrate and the flow path forming member; Including, The substrate is a substrate penetration portion that penetrates the substrate so as to open at the mounting surface and constitutes a part of a wall surface that forms the common liquid chamber; The flow path forming member is a recess provided on a surface facing the substrate, the recess individually covering each of the plurality of energy generating elements and being provided so as to partially face the substrate penetration portion, and forming the plurality of individual liquid chambers between the recess and the mounting surface; a plurality of through holes that open at positions in the recess that face the plurality of energy generating elements, respectively, and form the plurality of discharge ports; a wall portion provided at a position facing the substrate penetration portion and constituting a part of a wall surface that forms the common liquid chamber together with the substrate penetration portion; and a portion of the wall portion is formed by the elastic member, The liquid ejection head is characterized in that the elastic member is a part of the adhesion improving material.

2. The wall portion is The flow path forming member is configured to protrude from the recess toward the substrate penetration portion. a protrusion formed on the a protrusion-penetrating portion that penetrates the flow path forming member so as to open at a tip of the protrusion; and The liquid ejection head according to claim 1 , wherein the elastic member is provided so as to close the opening of the protrusion-penetrating portion at the tip of the protrusion.

3. the common liquid chamber extends in a longitudinal direction parallel to the arrangement direction of the plurality of energy generating elements, The liquid ejection head according to claim 2 , wherein the convex portion is provided so as to extend along the longitudinal direction of the common liquid chamber.

4. The liquid ejection head according to claim 2 , wherein the opening of the protrusion penetrating portion at the tip of the protrusion extends along a longitudinal direction parallel to the arrangement direction of the plurality of energy generating elements.

5. The liquid ejection head according to claim 2 , wherein the opening of the protrusion penetrating portion at the tip of the protrusion is divided into a plurality of portions along a longitudinal direction parallel to the arrangement direction of the plurality of energy generating elements.

6. A liquid ejection head as described in claim 2, wherein the opening of the convex-portion penetrating portion at the tip of the convex portion extends along a longitudinal direction parallel to the arrangement direction of the plurality of energy generating elements, and a plurality of openings are provided so as to be aligned parallel to each other with a gap in a direction perpendicular to the longitudinal direction.

7. The opening of the protrusion penetrating portion at the tip of the protrusion is divided into a plurality of portions along a longitudinal direction parallel to the arrangement direction of the plurality of energy generating elements, and the plurality of openings form a row arranged in the longitudinal direction, and The rows are formed in a plurality of rows so as to be arranged parallel to each other at intervals in a direction perpendicular to the longitudinal direction, The liquid ejection head according to claim 2 , wherein the openings adjacent to each other in a direction perpendicular to the longitudinal direction are arranged so that their positions in the longitudinal direction are shifted from each other.

8. the protruding portion-penetrating portion has a communication port that communicates the protruding portion-penetrating portion with the atmosphere, on a surface of the flow path forming member opposite to the opposing surface, 8. The liquid ejection head according to claim 2, wherein the communication port is open from the opposite surface so as to partially expose the protrusion-piercing portion to the outside.

9. The liquid ejection head according to claim 8 , wherein the protrusion penetrating portion has a plurality of the communication holes.

10. a tip of the protrusion has a joining surface to which the elastic member is joined and a concave surface that is recessed relative to the joining surface in a direction away from the board-penetrating portion, 10. The liquid ejection head according to claim 2, wherein the opening of the protrusion penetrating portion at the tip of the protrusion is provided in the concave surface.

11. the plurality of outlets includes a first outlet array and a second outlet array parallel to the first outlet array, the plurality of individual liquid chambers include a first individual liquid chamber array corresponding to the first ejection port array and a second individual liquid chamber array corresponding to the second ejection port array, 11. The liquid ejection head according to claim 1, wherein the wall portion is provided so as to separate the first individual liquid chamber array and the second individual liquid chamber array from each other with respect to the common liquid chamber.

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