Liquid ejection head and liquid ejection device

Abstract

To prevent a sealant from being disposed on the surface of a dam member.SOLUTION: The surface of a dam member is provided with a groove that extends from an end part of a second side face opposite a first side face of a substrate for a liquid discharge head so as to go away from the second side face. In a direction orthogonal to a discharge face, the bottom of the groove lies at the same position as the discharge face or at a position protruding from the discharge face.SELECTED DRAWING: Figure 7

Description

[Technical field]

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

[0002] An inkjet recording head (liquid ejection head) mounted on an inkjet recording device as a liquid ejection device is a device that ejects ink (liquid) from fine ejection orifices, causes the ink to land on a recording medium, and forms recorded images such as characters, diagrams, pictures, etc. The ink ejected from the ejection orifices of the liquid ejection head travels in a generally straight line toward the recording medium, lands at the intended position, and contributes to the formation of the recorded image.

[0003] However, sometimes the ejected ink becomes a mist of tiny droplets, floats in the atmosphere, and after drifting, adheres to the periphery of the ejection orifice of the liquid ejection head without landing on the recording medium.

[0004] In this way, the ink adhering to the periphery of the ejection orifice may hinder the ejection of new ink that is subsequently ejected. This is because, if ink is adhering to the periphery of the ejection orifice, when new ink is ejected, it may come into contact with the adhering ink and lose its straightness, causing the newly ejected ink to head toward the recording medium in a distorted state. As a result, the ink may not land at the intended position on the recording medium, which may impair the quality of the recorded image.

[0005] Therefore, in order to remove ink adhering around the ejection ports, many inkjet recording devices are equipped with a cleaning means that wipes the ejection port face of the recording head with a wiping member (wiper) made of an elastic material such as rubber to remove the adhering matter. In this case, in order to cover the entire ejection port face, i.e., from one end to the other, the wiping takes a path in which the wiper enters from outside one end of the ejection port face, wipes the ejection port face, and then exits to the outside of the other end of the ejection port face.

[0006] In this way, the ink adhering to the periphery of the ejection ports is removed from the ejection port face by the wiper, but at the same time, another problem can occur at the edge of the ejection port face. That is, the wiper can be damaged when it comes into contact with the edge of the ejection port face. The edge of the ejection port face has a corner formed on the ridge line that is the boundary between the ejection port face and the side wall surface. When the wiper enters the ejection port face from the outside of the edge of the ejection port face, if the wiper comes into strong contact with this corner, the wiper may be scratched or scraped, or the head may be damaged.

[0007] In particular, if there is a large space outside the end of the ejection port face, the wiper may jump through the space when entering the ejection port face and hit the corner of the end of the ejection port face directly, which may cause damage to the wiper.

[0008] To address this issue, Patent Document 1 adopts a method for reducing damage caused by contact between the wiper and the corner of the discharge port face end. Specifically, by providing a wiper support part on the outside of the discharge port face end, the space between the discharge port face end and the wiper support part is reduced, shortening the jump distance of the wiper and reducing the impact when it hits the corner.

[0009] It is also possible to provide a blocking member for blocking the sealant on the outside of the end of the ejection port surface, and place the sealant in the space between the outside of the end of the ejection port surface and the blocking member to fill the space. In this configuration, when the wiper enters the ejection port surface, the wiper also comes into contact with the top surface of the sealant placed on the outside of the end of the ejection port surface. In other words, by wiping the top surface of the sealant that fills the space and then continuously entering the ejection port surface, the wiper can perform a smooth wiping operation without jumping in the gap, and damage to the wiper can be reduced. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] JP 2019-181879 A Summary of the Invention [Problem to be solved by the invention]

[0011] However, when wiping, the wiper scrapes off the sealant that fills the space, carries it to the discharge port face, and deposits it around the discharge port, which may cause irregular discharge. In particular, when the sealant is placed on the surface of the blocking member, the possibility of the sealant being scraped off by the wiper increases.

[0012] Therefore, an object of the present invention is to reduce the risk of a sealant being disposed on the surface of a damming member. [Means for solving the problem]

[0013] The liquid ejection head of the present invention comprises a substrate for a liquid ejection head, the substrate comprising an ejection port surface from which liquid is ejected and a first side surface along a direction intersecting the ejection port surface, a blocking member comprising a second side surface opposed to the first side surface and a surface adjacent to the second side surface, the surface being provided along the ejection port surface and at a position protruding from the ejection port surface in a direction perpendicular to the ejection port surface, and a sealant for sealing between the first side surface and the second side surface. The liquid ejection device is provided with a wiper for wiping the ejection port surface. In the liquid ejection head, the surface of the damming member is provided with a slit extending from an end of the damming member on the second side surface in a direction away from the second side surface. a direction along a direction of relative movement between the discharge port surface and the wiper when the wiper wipes the discharge port surface, or a direction at an acute angle with the direction of relative movement between the discharge port surface and the wiper when the wiper wipes the discharge port surface a groove is provided extending toward the ejection port surface, a bottom surface of the groove is at the same position as the ejection port surface or at a position protruding from the ejection port surface in a direction perpendicular to the ejection port surface, and at least a portion of the bottom surface of the groove is exposed to the front surface side. The maximum width of the groove is 0.2 mm or more and 5 mm or less. It is characterized by the above. Effect of the Invention

[0014] According to the present invention, it is possible to suppress the risk of the sealant being disposed on the upper surface of the sealant blocking portion. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1 is a perspective view of an inkjet recording head; [Diagram 2] An exploded perspective view of a liquid ejection head [Diagram 3] Side view of the recording element substrate [Figure 4] FIG. 3 is a perspective view of a recording element substrate; [Diagram 5] FIG. 1 is a partial cross-sectional perspective view of a recording element substrate; [Figure 6] Cross-sectional view of an inkjet recording head [Figure 7] FIG. 1 is a diagram for explaining wiping performed on an inkjet recording head; [Figure 8] FIG. 1 shows a comparative example [Figure 9] FIG. 1 shows a comparative example [Figure 10] FIG. 1 shows a modified example [Figure 11] FIG. 1 shows a modified example [Figure 12] FIG. 1 shows a modified example [Figure 13] FIG. 1 shows a modified example DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described.

[0017] FIG. 1 is a schematic perspective view of an inkjet recording head 1 as a liquid ejection head according to this embodiment, and FIG. 2 is an exploded perspective view showing a schematic process of assembling the inkjet recording head 1. As shown in FIG.

[0018] The liquid ejection head 1 includes a support member 2, a recording element substrate 3 as a substrate for the liquid ejection head, an electrical connection substrate 4, an electrical connection sealant 5, a blocking member 6, and a peripheral sealant .

[0019] First, the support member 2 will be described (FIG. 2(a)). In the liquid ejection head 1, the support member 2 is a component that serves as a base when the recording element substrate 3, the electrical connection substrate 4, and the damming member 6 are joined with an adhesive 17 (FIG. 6(a)). The support member 2 is also provided with a flow path 18 (FIG. 6(a)) through which ink flows, and ink is supplied to the recording element substrate 3 from an ink storage component (not shown) via the flow path 18 of the support member 2.

[0020] The support member 2 is required to have strength and a flat bonding surface as a base for the inkjet recording head 1, and may be made of resin, metal, ceramic, or the like from the viewpoint of ease of processing the internal flow path 18. In this embodiment, a plate made of alumina (aluminum oxide, Al2O3) is used as the support member 2.

[0021] Next, a description will be given of the recording element substrate 3. Fig. 3 is a side view of the recording element substrate 3, Fig. 4 is a perspective view of the recording element substrate 3, and Fig. 5 is a partial cross-sectional perspective view of the recording element substrate 3.

[0022] In this embodiment, the recording element substrate 3 includes a silicon substrate 8 having a thickness of 0.6 to 0.8 mm, and a resin discharge port forming member 9 having a thickness of 0.01 to 0.1 mm in which the discharge ports 14a are formed, and is configured by bonding the two members together. By bonding the silicon substrate 8 and the resin discharge port forming member 9 together, the recording element substrate 3 has six surfaces. That is, the discharge port surface 10 in which the discharge ports 14a are formed, its back surface 11, and four side surfaces 12 adjacent to the discharge port surface 10 via ridges. The side surfaces 12 are aligned in a direction intersecting with the discharge port surface 10. With regard to the side surfaces 12, the side surfaces along the longitudinal direction of the recording element substrate 3 are referred to as side surfaces 12a (first side surfaces), and the side surfaces along the lateral direction are referred to as side surfaces 12b (second side surfaces). Some of the side surfaces are hidden in FIG. 4.

[0023] A silicon substrate 8 of the recording element substrate 3 is provided with a plurality of electrothermal conversion element groups 13 as energy generating elements that generate energy for ejecting liquid, and an electrical connection terminal group 16 for electrical connection to the outside. The electrothermal conversion element group 13, the electrical connection terminal group 16, and electrical wiring (not shown) connecting between them are formed by a film formation technique on the silicon substrate 8. The electrical connection terminal group 16 is electrically connected to electrical connection components to receive a drive signal and drive power from the outside.

[0024] 2(a), in this embodiment, an electrical connection board 4 (flexible electrical wiring board) is used, and an electrical connection terminal group 16 is connected to the electrical connection board 4 by wire bonding. Furthermore, in order to insulate and protect the wire bonding and its surroundings, the electrical connection board 4 is covered with an epoxy-based electrical connection sealant 5.

[0025] In addition, the end of the electrical connection board 4 opposite to the end connected to the electrical connection terminal group 16 of the recording element board 3 is connected to a board (not shown) for controlling the drive signal and drive power for driving the liquid ejection head 1.

[0026] A group of ejection ports 14a (hereinafter also referred to as ejection port group 14) corresponding to the electrothermal conversion elements 13 is formed by photolithography on the ejection port surface 10 of the recording element substrate 3. An ink supply port 15 is provided on the back surface 11 of the recording element substrate 3, and communicates with the opening of the flow path 18 of the support member 2 described above to form a flow path structure for supplying ink to the ejection port group 14.

[0027] In this embodiment, the ink ejection port groups 14 are arranged as two rows of ejection port groups, and the ink supply port 15 is shown as having one flow path structure, but the number of rows of the ejection port groups 14 and the number of flow path structures can be appropriately adjusted according to the number of ink colors installed in the inkjet recording device.

[0028] Next, the damming member 6 for damming the peripheral sealant 7 will be described. The damming member 6 has an opening 19 that is larger than the outer shape of the recording element substrate 3 and is used to house the recording element substrate 3 inside. By bonding the recording element substrate 3 and the damming member 6 to the support member 2 so as to enclose the recording element substrate 3 within this opening 19, the damming member 6 is configured as a bank that surrounds the outer periphery of the recording element substrate 3 (FIG. 2(b)).

[0029] FIG. 6(a) shows a cross section taken along line BB in FIG. 2(b).

[0030] By joining the recording element substrate 3 and the damming member 6 to the support member 2, a space 20 (gap) is formed by the side surface 12 of the recording element substrate 3, the opposing side surface 24 (second side surface) of the damming member 6, and the support member 2.

[0031] A top surface 22 (surface) of the damming member 6 that fits along the ejection port surface 10 is disposed at a position that protrudes from the ejection port surface 10 of the recording element substrate 3 in a direction perpendicular to the ejection port surface 10. A groove 21 is formed in the top surface 22 of the damming member 6 from the end portion on the side of the side surface 24 that constitutes the opening 19. A detailed description of the groove 21 will be given together with the description of wiping, which will be described later.

[0032] The damming member 6 can be formed by cutting metal or ceramic, or by resin molding using a mold. In this embodiment, the damming member 6 formed by resin molding is used. The damming member 6 may be molded integrally with the support member 2.

[0033] The space 20 created around the outer periphery of the recording element substrate 3 by disposing the damming member 6 is filled with a peripheral sealant 7 as shown in Fig. 1. There are no particular limitations on the peripheral sealant 7 that can be used, but it is convenient to apply a urethane-based liquid sealant that hardens at room temperature.

[0034] 6(b) is a cross section taken along line AA in FIG. 1, and shows the state after the peripheral sealant 7 has been placed. By filling the space 20 with the peripheral sealant 7, the side surface 12 of the recording element substrate 3 can be covered. Note that the appropriate filling amount of the peripheral sealant 7 is one in which the peripheral sealant 7 does not overflow onto the ejection port surface 10 of the recording element substrate 3 when applied.

[0035] At this time, the peripheral sealant 7 may creep up to the groove 21 of the damming member 6 due to surface tension, but does not creep up to the top surface 22 of the damming member 6 which is located higher than the bottom surface 21a of the groove 21. Thereafter, the peripheral sealant 7 hardens, and the liquid ejection head 1 is completed.

[0036] The liquid ejection head 1 completed in this manner is mounted on the main body of an inkjet recording apparatus, and when it receives a drive signal and drive power from the main body of the inkjet recording apparatus via the electrical connection parts, the liquid ejection head 1 is able to eject ink.

[0037] When ink is repeatedly ejected, ink floating in the atmosphere may gradually adhere to the ejection port surface 10 as unnecessary ink. For this reason, in an inkjet recording apparatus 1000 (FIG. 7) having a liquid ejection head 1 and a wiper 23, wiping is performed by the wiper 23 to wipe the ejection port surface 10.

[0038] Next, this wiping will be described. Wiping is an operation for cleaning the ejection port surface 10 by wiping off the ink by scanning a rubber blade-shaped wiper 23 about 1 mm thick in one direction while it is in contact with the ejection port surface 10 to which ink is attached.

[0039] 7(a) is a plan view showing wiping of the liquid ejection head 1. In order to wipe the entire ejection port surface 10 on which ink is attached in one wiping, it is desirable to make the width of the wiper 23 larger than the width of the recording element substrate 3. Here, in this embodiment, the width refers to the length in the direction along the longitudinal direction of the liquid ejection head 1.

[0040] In addition, by starting wiping from the top surface 22 on one side of the damming member 6 located outside the ejection port surface 10 and scanning in the direction of arrow Y to the top surface 22 of the damming member 6 on the opposite side, the entire surface of the ejection port surface 10 from end to end can be wiped.

[0041] Fig. 7(b) is a cross-sectional view taken along line CC in Fig. 7(a), and Fig. 7(c) is a partially enlarged view of region D in Fig. 7(b). First, the wiper 23 comes into contact with the top surface 22 of the damming member 6 disposed on the outside of the recording element substrate 3, and then passes over the surface of the peripheral sealant 7 and enters the ejection port surface 10. Thereafter, the wiper 23 wipes the ejection port surface 10, and then scans over the surface of the peripheral sealant 7 on the opposite side, and over the top surface 22 of the peripheral seal damming member 6 in that order.

[0042] Here, since the damming member 6 is provided with the groove 21 dug lower than the top surface 22, the sealant 7a that rises to the bottom surface 21a of the groove 21 due to surface tension when the peripheral sealant 7 is applied is hardened while remaining inside the groove 21. In this state, even when wiping is performed, the wiper 23 passes over the top surface 22, so that the sealant 7a that rises to the bottom surface 21a of the groove 21 is unlikely to come into direct contact with the wiper 23, and therefore the risk of the sealant 7 being scraped off by the wiper 23 can be reduced.

[0043] There is no particular restriction on the shape of the groove 21, but by making the depth of the groove 21 0.2 mm or more deeper than the top surface 22, the sealant 7a that has climbed up onto the bottom surface 21a of the groove 21 can be prevented from further climbing up onto the top surface 22. On the other hand, if the groove 21 is made too deep, there is a risk that it will be buried together with the surrounding sealant 7 when filling the space 20. For this reason, it is preferable that the bottom surface 21a of the groove 21 is at the same position as the ejection port surface 10 or at a position protruding from the ejection port surface 10 in the direction perpendicular to the ejection port surface 10. More preferably, the depth is such that the position of the bottom surface 21a is at a height position approximately equal to that of the ejection port surface 10.

[0044] There is no particular restriction on the width of the groove 21, but by making it about 0.2 mm or more, it becomes easier to sufficiently accommodate the sealant 7a that has run up. On the other hand, if the width is too wide, there is a possibility that the wiper will enter the groove 21 when it is bent, so it is preferable to make it about 5 mm or less. In other words, it is preferable that the maximum width of the groove 21 is 0.2 mm or more and 5 mm or less. In addition, the cross section of the groove 21 is not limited to a rectangle, and it is also acceptable for it to be a semicircle or an inverted triangle. In addition, by making the groove 21 into a shape that becomes thinner in the extension direction away from the space 20, it is expected that the groove 21 will have a capillary effect and the sealant 7 will easily enter the groove 21.

[0045] In this embodiment, the grooves 21, each having a rectangular cross section with a width of 1 mm and a depth of 0.5 mm, are provided at a pitch of 2 mm on two side surfaces 24 (24a) of the opening 19 of the damming member 6 along the longitudinal direction of the recording element substrate 3 (the X direction in FIG. 7A). The grooves 21 extend from the side surfaces 24 to a position not reaching the outer periphery of the damming member 6 along a direction intersecting the longitudinal direction (preferably the Y direction, which is a direction perpendicular thereto). The extension direction of the grooves 21 is along the movement direction of the wiper 23 (the relative movement direction between the wiper 23 and the discharge port surface 10). In this embodiment, the longitudinal direction of the recording element substrate 3 is along the longitudinal direction of the liquid discharge head 1. The grooves 21 are arranged so that the bottom surface 21a of the grooves 21, which is 0.5 mm deep, is at the same height as the discharge port surface 10. In this embodiment, during wiping, the wiper 23 passes over the two side surfaces 24a in the Y direction and passes over an area inside the two side surfaces 24b in the X direction. Therefore, the groove 21 is not provided on the side surface 24b (fourth side surface) of the damming member 6 that faces the side surface 12b (third side surface) of the recording element substrate 3.

[0046] In addition, since the side surface 12 of the recording element substrate 3 is protected by filling the peripheral sealant 7, damage caused by the wiper 23 colliding with the side surface 12 can be suppressed.

[0047] Furthermore, as shown in FIG. 7(c), in order to reduce damage when the wiper 23 wipes the discharge port surface 10 and comes into contact with the top surface 22 of the damming member 6 on the opposite side, it is also effective to make the corners 22b of the top surface 22 round.

[0048] 8 shows a state where wiping is performed on a liquid ejection head 100 having a damming member 60 that does not have grooves 21, which is Comparative Example 1. Because there are no grooves 21, the sealant 70 that is filled to fill the space creeps up to the top surface of the damming member 60. The peripheral sealant 70a that has creeped up and hardened is thin and easily peeled off, so there is a risk that it will be scraped off by the wiper 230 as shown in FIG. 8(b). If the scraped off peripheral sealant 70b is carried by the wiper 230 and adheres to the ejection port surface, there is a risk that ejection distortion will occur.

[0049] 9 shows a state where wiping is performed on a liquid ejection head 110 that does not have a damming member 6, which is Comparative Example 2. Since there is no damming member 6 and the side surface 120 of the recording element substrate 30 cannot be protected by the peripheral sealant 7, the wiper 231 hits the side surface 120 strongly and penetrates onto the ejection port surface. This creates the risk of damaging the wiper 231 and the recording element substrate 30.

[0050] In contrast to these comparative examples, as described above, in this embodiment, the groove 21 can reduce the risk of the peripheral sealant 7 being placed on the top surface of the damming member 6, and the peripheral sealant 7 can be prevented from being scraped off by the wiper 23 during wiping. In addition, since the side surface 12 of the recording element substrate 3 is protected by the peripheral sealant 7, damage to the wiper 23 and the recording element substrate 3 during wiping can be reduced.

[0051] (Modification) A modified example of the present invention is shown in Figs.

[0052] As shown in FIG. 10(a), the groove 21 may be provided on the side surface 24b of the opening 19 of the blocking member 6 along the short-side direction (Y direction) of the recording element substrate 3. That is, the groove 21 may be provided on the entire circumference of the opening 19 of the blocking member 6. If the groove 21 is provided in a direction perpendicular to the wiping direction (Y direction) as shown in FIG. 10(a), the wiper 23 may get caught in the groove 21. Therefore, it is more preferable to arrange the groove 21 so that the angle intersecting with the wiping direction is an acute angle (preferably about 10° to 45°) as shown in FIG. 10(b) and FIG. 10(c). This reduces the risk of the wiper 23 getting caught in the groove.

[0053] Also, as shown in FIG. 11(a), the groove 21 may be arranged so as to extend from the opening 19 to the outer periphery of the damming member 6. That is, the groove 21 may reach from the side surface 24 of the damming member 6 to the surface 26 opposite to the side surface 24. This allows a large amount of sealant 7 to be accommodated in the groove 21, and the sealant 7 can be further prevented from running up onto the top surface 22 of the damming member 6. Note that the liquid ejection head 1 may be covered from the ejection port surface 10 side with a sealing member in order to prevent the ejection port surface 10 from drying, etc. As shown in FIG. 11(b), if there is a surface area 25 on the outer periphery of the groove 21 on the top surface 22 of the damming member 6 where the sealing member can abut, this area 25 can be used as a sealing area when the sealing member is used to cover the ejection port surface 10. Therefore, such a form is preferable from the viewpoint of preventing the ejection port surface 10 from drying.

[0054] 12 shows an example in which a groove 21 is provided near a corner 19a between a side surface 24a and a side surface 24b of an opening 19. When filling a space 20 between a recording element substrate 3 and a blocking member 6 with a peripheral sealant 7, the peripheral sealant 7 is stagnant and difficult to spread at a corner 19a of the opening 19, and a larger amount of the peripheral sealant 7 may be applied than in other regions. Therefore, it is preferable to provide a groove 21 at least near the corner 19a, since there is a higher risk that the peripheral sealant 7 will run up onto the top surface 22 near the corner 19a compared to other regions. In addition, it is also effective to provide grooves 21 in other regions and to arrange more grooves 21 at higher density near the corner 19a.

[0055] As shown in FIG. 13, in the liquid ejection head 1, a long line head may be formed by arranging a plurality of recording element substrates 3. The above-mentioned groove 21 may also be provided in such a line head. A plurality of recording element substrates 3 are arranged inside the opening 19 of the blocking member 6. In the case of a line head, the peripheral sealant 7 tends to be easily stagnated in the vicinity of the portion between the recording element substrate 3a (substrate for the first liquid ejection head) and the recording element substrate 3b (substrate for the second liquid ejection head) adjacent to each other. Therefore, it is preferable to provide the groove 21 (21b) at least in the vicinity of the position facing the portion between the adjacent recording element substrates 3. In addition, it is also effective to provide the groove 21 in other regions and to arrange the grooves 21 more densely in the vicinity of the facing position of the portion between the recording element substrates. [Explanation of symbols]

[0056] 1 Liquid ejection head 3. Recording element substrate (liquid ejection head substrate) 6. Damming material 7 Perimeter sealant 9. Discharge port forming member 10 Discharge port surface 12 Side of the recording element board 21 Groove 22 Surface of the damming member 24 Side of damming member

Claims

1. a liquid ejection head substrate including an ejection port surface for ejecting liquid and a first side surface extending in a direction intersecting the ejection port surface; a damming member including: a second side surface opposed to the first side surface; and a surface adjacent to the second side surface, the surface being provided along the discharge port surface and at a position protruding beyond the discharge port surface in a direction perpendicular to the discharge port surface; a sealant for sealing between the first side surface and the second side surface; a liquid ejection head provided in a liquid ejection device having a wiper for wiping the ejection port surface, a groove is provided on the surface of the damming member, the groove extending from an end portion on the second side surface side in a direction away from the second side surface and in a direction along or at an acute angle with a direction of relative movement between the discharge port surface and the wiper when the wiper wipes the discharge port surface, A liquid ejection head characterized in that, in a direction perpendicular to the ejection port surface, a bottom surface of the groove is at the same position as the ejection port surface or at a position protruding further than the ejection port surface, at least a portion of the bottom surface of the groove is exposed on the surface side, and a maximum width of the groove is 0.2 mm or more and 5 mm or less.

2. The liquid ejection head according to claim 1 , wherein the sealant is disposed so as to cover at least a portion of the bottom surface of the groove from the second side surface.

3. The liquid ejection head according to claim 1 , wherein a plurality of said grooves are provided.

4. the second side surface is aligned along a longitudinal direction of the liquid ejection head, The liquid ejection head according to claim 1 , wherein the groove extends in a direction intersecting the longitudinal direction.

5. the damming member includes a fourth side surface adjacent to the front surface and the second side surface, facing a third side surface different from the first side surface of the liquid ejection head substrate, the fourth side surface being aligned along a direction intersecting the longitudinal direction; The liquid ejection head according to claim 4 , wherein no groove is provided at an end of the front surface on the side of the fourth side surface.

6. the damming member has a fourth side surface adjacent to the second side surface and facing a third side surface different from the first side surface of the liquid ejection head substrate, The liquid ejection head according to claim 1 , wherein the groove is provided at least near a corner between the second side surface and the fourth side surface.

7. The liquid ejection head according to claim 1 , wherein the groove does not reach from the second side surface to a surface of the damming member opposite to the second side surface.

8. The liquid ejection head according to claim 1 , wherein the groove extends from the second side surface to a surface of the damming member opposite to the second side surface.

9. the second side surface is aligned along a longitudinal direction of the liquid ejection head, 9. The liquid ejection head according to claim 1, wherein a maximum length of the groove along the longitudinal direction is 0.2 mm or more and 5 mm or less.

10. A liquid ejection head described in any one of claims 1 to 9, wherein the direction in which the groove extends extends along the direction of relative movement between the ejection outlet surface and the wiper when the wiper wipes the ejection outlet surface.

11. A liquid ejection head described in any one of claims 1 to 10, wherein the direction in which the groove extends intersects the direction of relative movement between the ejection outlet surface and the wiper when the wiper wipes the ejection outlet surface at an angle of 10° to 45°.

12. A liquid ejection head described in any one of claims 1 to 11, wherein a plurality of the substrates for the liquid ejection head are arranged along the longitudinal direction of the liquid ejection head.

13. A liquid ejection head according to any one of claims 1 to 12, The wiper; A liquid ejection device comprising:

14. The liquid ejection device according to claim 13 , wherein a plurality of the grooves are provided in an area of ​​the ejection port face that overlaps with the wiper when the wiper wipes the ejection port face.

Images