JP2022170487A - liquid ejection head - Google Patents

Abstract

To provide a liquid ejection head that facilitates recovery of air accumulated in a supply integration channel.SOLUTION: A liquid ejection head includes: a plurality of supply manifolds that has a long dimension, are parallelly provided in a width direction crossing a longitudinal direction thereof, and supply liquid to a nozzle; a plurality of return manifolds that extend in a longitudinal direction, are parallelly provided in the width direction, and into which liquid that has not been ejected by the nozzle flows; a plurality of individual channels whose upstream ends are connected to the supply manifolds, whose downstream ends are connected to the return manifolds, and individually communicate with a plurality of nozzles arranged in a line in the longitudinal direction of the supply manifolds; a supply integration channel that is provided at one end of the supply manifolds in the longitudinal direction and supplies liquid to the plurality of supply manifolds; a recovery integration channel that is provided at one ends in the longitudinal direction of the supply manifolds and recovers liquid from the plurality of return manifolds; and a bypass channel connecting the supply integration channel and the recovery integration channel.SELECTED DRAWING: Figure 8

Description

The present invention relates to a liquid ejection head that ejects liquid.

2. Description of the Related Art As a print head, a liquid ejection head that performs printing by ejecting liquid such as ink onto a print medium is known. For example, Patent Literature 1 discloses a circulation head configured to collect, in a return manifold, the liquid that is not ejected by a nozzle out of the liquid supplied from a supply manifold, and then returns it to the supply manifold. In this circulation head, a supply integration channel is provided on one side in the longitudinal direction of the supply manifold, and a recovery integration channel is provided on the other longitudinal direction side.

Japanese Patent No. 6600122

However, in the above-described conventional configuration, there is a risk that the air in the integrated supply flow path will remain in the integrated supply flow path without being discharged. As a result, there is a possibility that the air in the integrated supply channel enters the nozzle, resulting in the nozzle being unable to eject liquid droplets.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a liquid ejection head that facilitates recovery of air accumulated in the integrated supply channel.

The liquid ejection head of the present invention has a long dimension and is arranged side by side in a width direction intersecting the longitudinal direction, and a plurality of supply manifolds for supplying liquid to nozzles, and extending in the longitudinal direction and arranged side by side in the width direction. a plurality of return manifolds into which the liquid not discharged by the nozzles flows; an upstream end connected to the supply manifold; a downstream end connected to the return manifold; and arranged in rows in the longitudinal direction of the supply manifold. a plurality of individual channels individually communicating with a plurality of nozzles arranged in a circle; a supply integration channel provided at one end of the supply manifold in the longitudinal direction for supplying liquid to the plurality of supply manifolds; a recovery integration channel provided at one longitudinal end of the supply manifold for recovering liquid from the plurality of return manifolds; and a bypass channel connecting the supply integration channel and the recovery integration channel. Be prepared.

According to the present invention, by providing a bypass channel that connects the supply integration channel and the recovery integration channel, the air accumulated in the supply integration channel is discharged to the recovery integration channel via the bypass channel. be able to. In addition, since the integrated supply channel and the integrated recovery channel are integrated at one end in the longitudinal direction of the supply manifold, the bypass channel can be shortened, which makes it easier to discharge air.

According to the present invention, it is possible to provide a liquid ejection head that facilitates collection of air accumulated in the integrated supply channel.

1 is a plan view showing a schematic configuration of a liquid ejection device including a liquid ejection head according to an embodiment; FIG. 2 is a plan view of the liquid ejection head of FIG. 1; FIG. 3 is a plan view showing a configuration of the liquid ejection head of FIG. 2 with a second channel member removed; FIG. 2 is a cross-sectional view of a first channel member of the liquid ejection head of FIG. 1; FIG. FIG. 4 is a plan view of a second flow path member; FIG. 5 is a plan view of a plate that constitutes the second channel member; (a) is a plan view of a plate that constitutes the second channel member, (b) is a side view of the plate in (a), and (c) is a bottom view of the plate in (a). (a) and (b) are plan views of a plate that constitutes the second channel member. (a) and (b) are plan views of a plate that constitutes the second channel member. FIG. 11 is a plan view showing a modification of one plate of the second channel member; FIG. 4 is a diagram showing a filter arranged at a position on the supply side and a connection channel that connects the supply integration channel and the supply manifold; FIG. 10 is a diagram showing that no filter is placed at the collection side position; (a) is a diagram showing a modification of the shape of the integrated supply channel, and (b) is a diagram showing the individual integrated channel. FIG. 11 is a plan view showing a bypass channel and a liquid supply channel provided in a plate of the second channel member;

Hereinafter, liquid ejection heads according to embodiments of the present invention will be described with reference to the drawings. The liquid ejection head described below is merely one embodiment of the present invention. Therefore, the present invention is not limited to the following embodiments, and additions, deletions, and modifications can be made without departing from the scope of the present invention.

The liquid ejection head 3 according to this embodiment is provided in, for example, a liquid ejection device 110 . The liquid ejection device 110 ejects liquid such as ink. An example in which the liquid ejection device 110 is applied to an inkjet printer will be described below, but the application target of the liquid ejection device 110 is not limited to this.

As shown in FIG. 1, the liquid ejecting apparatus 110 employs, for example, a line head system, and includes a platen 111, a conveying section, a head unit 116, and a tank 112. As shown in FIG. However, the liquid ejecting apparatus 110 is not limited to the line head type, and other types such as a serial head type may be employed.

The platen 111 is a flat plate member on which the ejection receiving medium paper PP is arranged and plays a role of determining the distance between the paper PP and the head unit 116 .

The transport section has two transport rollers 115 and a transport motor (not shown). The two transport rollers 115 are connected to the transport motor and arranged parallel to each other along a direction orthogonal to the transport direction of the paper PP (perpendicular direction) with the platen 111 sandwiched therebetween. When the transport motor is driven, the transport roller 115 rotates, thereby transporting the paper PP on the platen 111 in the transport direction.

The head unit 116 has a length equal to or greater than the length of the paper PP in the orthogonal direction. A head unit 116 is provided with a plurality of liquid ejection heads 3 .

In the liquid ejection head 3, a plurality of nozzle holes (nozzles) 9 in FIG. 4 are opened on the ejection surface (nozzle surface) SF2. The meniscus vibrates in the nozzle hole 9, thereby ejecting the liquid. Details of the liquid ejection head 3 will be described later.

If the liquid is ink, for example, a tank 112 is provided for each type of ink. For example, four tanks 112 are provided, and each tank 112 stores black, yellow, cyan, and magenta ink. The ink in the tank 112 is supplied to the corresponding nozzle holes 9 .

2 is a plan view of the liquid ejection head 3 of FIG. 1, and FIG. 3 is a plan view of the liquid ejection head 3 of FIG. 2 with the second channel member 7 removed.

As shown in FIG. 2, the liquid ejection head 3 of the present embodiment includes a first flow path member 5, a second flow path member 7 that supplies liquid to the first flow path member 5, and a pressure section. and a piezoelectric actuator substrate 41 including a displacement element 51 . The first channel member 5 and the second channel member 7 each extend in the longitudinal direction. In this embodiment, the longitudinal direction is the extending direction of the supply manifold 21, which will be described later. The width direction in FIGS. 2 and 3 is a direction perpendicular to the longitudinal direction.

On the upper surface of the second flow path member 7, an opening 25b is provided at one end in the longitudinal direction, and an opening 27b is provided at the other end in the longitudinal direction. Liquid from the outside is supplied to the second channel member 7 through the opening 25b, and liquid not discharged in the first channel member 5 described later is recovered from the second channel member 7 through the opening 27b. It's like A through hole 19a is provided in the second flow path member 7, and a signal transmission section (FPC: Flexible Printed Circuit) (not shown) for sending a signal to each displacement element 51 passes through the through hole 19a. It is electrically connected to the control section of the abbreviation.

As shown in FIG. 3, a plurality of elongated supply manifolds 21 and a plurality of elongated return manifolds 23 are provided in the first channel member 5 so as to extend in the longitudinal direction. Each return manifold 23 is arranged below the corresponding supply manifold 21 .

The supply manifold 21 has openings 21b at both ends in the longitudinal direction. Further, the return manifold 23 has openings 23b at both ends in the longitudinal direction and on the outside of the openings 21b of the supply manifold 21 in the longitudinal direction.

In such a configuration, in the first channel member 5, the liquid supplied from the second channel member 7 to each supply manifold 21 through each opening 21b flows toward the center of the supply manifold 21. . Then, the liquid flows into a plurality of pressure chambers 11, which will be described later, corresponding to each supply manifold 21, and then part of the liquid is discharged from the nozzle holes 9. As shown in FIG. On the other hand, the liquid that has not been discharged from the nozzle holes 9 flows into the return manifold 23 and is discharged to the outside from the first channel member 5 through each opening 23b.

Next, the cross-sectional configuration of the first channel member 5 in the liquid ejection head 3 will be described. FIG. 4 is a cross-sectional view of the first channel member 5 of the liquid ejection head 3. As shown in FIG.

As shown in FIG. 4, the first channel member 5 has a laminated structure in which a plurality of plates are laminated. The piezoelectric actuator substrate 41 has a laminated structure including two piezoelectric ceramic layers 41a and 41b, which are piezoelectric bodies. The lower surface of this piezoelectric ceramic layer 41b serves as the pressure chamber surface SF1. A plurality of pressurizing chambers 11 are arranged side by side in the longitudinal direction (that is, the direction of the nozzle rows) on the pressurizing chamber surface SF1. Further, a plurality of nozzle holes 9 for ejecting liquid are arranged side by side in the longitudinal direction on the ejection surface SF2.

The first channel member 5 has plates 5a to 5l, for example. The plate 5a is connected to the pressure chamber surface SF1, which is the lower surface of the piezoelectric ceramic layer 41b. Plates 5b to 5l are stacked in this order under the plate 5a. Each plate is formed with holes and grooves of various sizes. A plurality of nozzle holes 9, a plurality of individual flow paths 60 described later, a supply manifold 21 and a return manifold 23 are formed as liquid flow paths by combining holes and grooves inside a flow path forming body formed by stacking each plate. It is In addition, the opening 21b and the opening 23b which were mentioned above are provided in pressurization chamber surface SF1. Further, a nozzle hole 9 is opened in the ejection surface SF2.

The nozzle hole 9 is formed through the plate 5l in the stacking direction (height direction). The tips of a plurality of nozzle holes 9 are arranged side by side in the direction of the nozzle rows on the ejection surface SF2 of the plate 5l.

The pressurizing chamber 11 is composed of a pressurizing chamber main body 11a facing the displacement element 51 and a descender 11b having a smaller cross-sectional area than the pressurizing chamber main body 11a. The pressure chamber main body 11a is formed in the plate 5a. Also, the descender 11b is formed over the plates 5b to 5k.

The pressurizing chamber main body 11 a and the supply manifold 21 are connected by a supply throttle passage 13 . That is, the supply throttle path 13 individually communicates each pressurizing chamber main body 11 a with the supply manifold 21 . The supply throttle passage 13 is formed by a hole penetrating the plate 5b, a groove penetrating the plate 5c, and a hole penetrating the plate 5d.

The descender 11 b and the feedback manifold 23 are connected by a feedback throttle path 15 . That is, the feedback throttle path 15 individually communicates each descender 11 b with the feedback manifold 23 . The feedback throttle path 15 is formed in a groove 15aa that is adjacent to a hole formed in the plate 5k of the descender 11b and that penetrates the plate 5k, a groove 15ab that penetrates the plate 5j, and a plate 5i of the return manifold 23. It is formed by a groove 15b adjacent to the hole and passing through the plate 5i.

In the present embodiment, the flow path including the supply throttle path 13 , the pressurization chamber 11 (the pressurization chamber main body 11 a and the descender 11 b ), and the return throttle path 15 is the individual flow path 60 . Individual channels 60 are connected to supply manifold 21 and return manifold 23 . Specifically, the individual flow path 60 has an upstream end connected to the supply manifold 21, a downstream end connected to the return manifold 23, and connected to the base end of the nozzle hole 9 therebetween.

The supply manifold 21 is formed by stacking holes passing through the plates 5e and 5f. A damper chamber 30A is provided below the supply manifold 21 . The damper chamber 30A is formed by half-etching the lower half of the plate 5g in the thickness direction. Thus, a thin damper portion 29A is formed under the supply manifold 21. As shown in FIG.

The return manifold 23 is formed by stacking holes passing through the plates 5i and 5j. A damper chamber 30B is provided below the return manifold 23 . The damper chamber 30B is formed by half-etching the lower half of the plate 5k in the thickness direction. Thus, a thin damper portion 29B is formed under the return manifold 23. As shown in FIG.

The displacement element 51 of the piezoelectric actuator substrate 41 is provided so as to be positioned above the pressure chamber 11 described above. Moreover, the individual electrode 45 is provided in the position which opposes each pressurization chamber 11 in a height direction. The individual electrodes 45 are electrically connected to the driver IC. The driver IC receives a control signal from a control unit (not shown), generates a drive signal, and applies the drive signal to the individual electrodes 45 .

A common electrode 43 is provided between the piezoelectric ceramic layers 41 a and 41 b of the piezoelectric actuator substrate 41 . A common electrode 43 is provided so as to cover each pressure chamber 11 . The common electrode 43 is always held at ground potential. Note that the piezoelectric ceramic layer 41b functions as a diaphragm.

The active portion of the piezoelectric ceramic layer 41a on which the individual electrode 45 overlaps expands and contracts along with the individual electrode 45 and the common electrode 43 in response to the drive signal. In response to this, the piezoelectric ceramic layer 41b, which is a vibration plate, is cooperatively deformed, and the volume of the pressurizing chamber 11 is increased or decreased. As a result, a discharge pressure for discharging the liquid from the nozzle hole 9 is applied to the pressure chamber 11 according to the volume of the pressure chamber 11 .

In such a configuration, the liquid first flows from the supply manifold 21 into the supply throttle passage 13 and then flows into the pressurization chamber 11 from the supply throttle passage 13 . The liquid then flows through the descender 11 b and into the nozzle hole 9 . When the ejection pressure is applied to the pressurizing chamber 11 in this state, the liquid is ejected from the nozzle hole 9 .

On the other hand, part of the liquid that has not been discharged from the nozzle hole 9 flows through the return throttle passage 15 and then flows into the return manifold 23 . The liquid that has flowed into the return manifold 23 flows through the return manifold 23 and returns to the second channel member 7 .

Next, the second flow path member in this embodiment will be described in detail. FIG. 5 is a plan view of the second channel member 7. FIG. 6 is a plan view of a plate 7a that constitutes the second channel member 7. FIG. FIG. 7(a) is a plan view of a plate 7b constituting the second channel member 7, (b) is a side view of the plate 7b in (a), and (c) is a plate 7b in (a). It is a bottom view. 8(a) and 8(b) are plan views of plates 7c and 7d, respectively, which constitute the second flow path member 7. FIG. 9(a) and 9(b) are plan views of plates 7e and 7f that constitute the second channel member 7. FIG.

As shown in FIG. 5, the second flow path member 7 is joined to the pressure chamber surface SF1 of the first flow path member 5. As shown in FIG. The second channel member 7 is composed of plates 7a to 7f, which are etching plates stacked in order from the top. A plate 7f shown in FIG. 9B is provided with a housing space 19 for housing the piezoelectric actuator substrate 41 described above. The second channel member 7 has a supply integration channel 25 that supplies liquid to the supply manifold 21 and a recovery integration channel 27 that recovers the liquid in the return manifold 23 . The supply integration channel 25 includes an opening 25b, a member 25a1, a reservoir 25a2, a branch channel 25a3 and a branch channel 25a4, which will be described later. The collection integration channel 27 also includes an opening 27b, a member 27a1, a reservoir 27a2, a branch channel 27a3, and a branch channel 27a4, which will be described later.

As shown in FIG. 6 , an opening 25 b that opens to the upper surface of the plate 7 a of the second flow path member 7 is arranged at one longitudinal end of the second flow path member 7 . The channel configuration of the supply integration channel 25 starts from the upstream opening 25b, is provided with a portion 25a1 as shown in FIG. 7(a), and is provided with a storage portion 25a2. A branch flow path 25a3 extending in the longitudinal direction is provided downstream of the reservoir 25a2, as shown in FIG. 8(b). The branch channel 25a3 is branched at the center in the longitudinal direction into two channels extending on one side and the other side in the longitudinal direction. As shown in FIGS. 8(b) and 9(a) and (b), there is a width direction at the tip of the one-side channel and the tip of the other-side channel of the branch channel 25a3. An extending branch channel 25a4 is connected. Each of the branch flow paths 25 a 4 is branched to one side and the other side in the width direction of the second flow path member 7 and connected to the openings 21 b in the supply manifold 21 of the first flow path member 5 .

On the other hand, at the other end of the second channel member 7 in the longitudinal direction, as shown in FIG. The flow path configuration of the recovery integration flow path 27 starts from an opening 27b on the upstream side, is provided with a portion 27a1 as shown in FIG. 7(a), and is provided with a storage portion 27a2. A branch channel 27a3 extending in the longitudinal direction is provided on the downstream side of the reservoir 27a2, as shown in FIG. 8(b). The branch channel 27a3 is branched into two channels extending on one side and the other side in the longitudinal direction at the center in the longitudinal direction. As shown in FIG. 8B and FIGS. An extending branch channel 27a4 is connected. Each of the branch flow paths 27 a 4 is branched to one side and the other side in the width direction of the second flow path member 7 and connected to the openings 23 b in the return manifold 23 of the first flow path member 5 . In a plan view, the branch flow path 25a3 and the branch flow path 27a3 are arranged such that at least a portion thereof overlaps with each other. In the configuration as described above, when performing printing, the liquid is supplied from the outside to the openings 25b of the supply integration channel 25, and the liquid that has not been discharged from the nozzle holes 9 is recovered from the openings 27b of the recovery integration channel 27. It is designed to be

Here, as shown in FIGS. 5 and 8B, the second channel member 7 is provided with a bypass channel 65 that connects the supply integration channel 25 and the recovery integration channel 27. ing. Specifically, as shown in FIG. 8(b), the bypass channel 65 includes one end in the width direction of each branch channel 25a4 and one end of each branch channel 27a4 on both one side and the other side in the longitudinal direction. Each one-side bypass channel 65a connecting the one end is included. In addition, the bypass channel 65 includes the other side bypass channel 65b that connects the other end in the width direction of the branch channel 25a4 and the other end of the branch channel 27a4 on one side and the other side in the longitudinal direction. The flow path resistance of the bypass flow path 65 is the combined resistance of flow paths from the supply manifold 21 to the return manifold 23 via the nozzle holes 9 , specifically, from the supply manifold 21 to the return manifold 23 via the individual flow paths 60 . Higher than the combined resistance of the flow path.

As described above, according to the liquid ejection head 3 of the present embodiment, by providing the bypass channel 65 that connects the supply integration channel 25 and the recovery integration channel 27, the liquid accumulated in the supply integration channel 25 Air can be discharged to the collection integration channel 27 via the bypass channel 65 . In addition, since the supply integration channel 25 and the recovery integration channel 27 are gathered at one end in the longitudinal direction of the supply manifold 21, the bypass channel 65 can be shortened, which facilitates air discharge. Furthermore, since the air in the supply integration channel 25 is caught in the second channel member 7 during purging and when the print duty is high, the possibility of clogging the nozzle holes 9 can be reduced.

Moreover, in this embodiment, the bypass channel 65 includes a one-side bypass channel 65a and the other-side bypass channel 65b. In this way, by providing the bypass channels 65 at both ends in the longitudinal direction of the integrated supply channel 25 (the branch channel 25a4 of the integrated supply channel 25), the discharge of air in the integrated supply channel 25 is improved. be able to.

Furthermore, in the present embodiment, the flow path resistance of the bypass flow path 65 is the combined resistance of flow paths from the supply manifold 21 through the nozzle holes 9 to the return manifold 23 , specifically, the individual flow path 60 from the supply manifold 21 . higher than the combined resistance of the flow path through to the return manifold 23 . In this case, by minimizing the flow rate of liquid in the bypass channel 65, the amount of liquid in the channel from the supply manifold 21 to the return manifold 23 via the nozzle holes 9 can be made sufficient.

<Modification>
The present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the gist of the present invention. For example:

As shown in FIG. 10, a bypass channel 165 may be formed in at least the uppermost plate 7a among the plurality of plates 7a to 7f. In this case, the bypass channels 165 may be formed in the plates 7a, 7b, 7c. This makes it possible to further improve the air discharge performance.

As shown in FIG. 11, the position between the bypass channel 65 and the supply manifold 21 in the supply integration channel 25 (the branch channel 25a4 of the supply integration channel 25) (more specifically, the position of the second channel member 7) A filter FT may be affixed to the position P1 directly above. In this case, even if the filter FT is provided, since the air can be discharged through the bypass flow path 65, the air discharge is not hindered. On the other hand, as shown in FIG. 12, no filter is arranged in the recovery integration channel 27 (the branch channel 27a4 of the recovery integration channel 27). In this case, unnecessary provision of filters can be avoided.

Further, as shown in FIG. 13(a), as a modification of the branch channel 25a4 of the supply integration channel 25, a channel 125a4 formed in a plurality of plates (for example, plates 7d, 7e, and 7f) is adopted. good too. The channel 125a4 is formed by combining the openings of the stacked plates 7d, 7e, and 7f, and the upper plate among the plates 7d, 7e, and 7f has a tapered shape in which the opening becomes smaller. . Employing such a channel 125a4 makes it easier to discharge the air in the supply integration channel 25. As shown in FIG.

Also, as shown in FIG. 13(b), a plurality of individual integration flow paths 225a4 may be formed in the plates 7e and 7f to be individually connected to each of the plurality of supply manifolds 21 respectively. The individual integrated channel 225a4 includes an individual channel 72 formed in the plate 7e and an individual channel 73 formed in the plate 7f. The widthwise dimension of the individual integrated channel 225 a 4 is the same as the widthwise dimension of the supply manifold 21 . In this case, it becomes easier to discharge the air in the supply integration channel 25 .

Further, as shown in FIG. 14, the bypass channel 65 connects one end in the width direction of each branch channel 25a4 and one end of each branch channel 27a4 on both one side and the other side in the longitudinal direction. Each one-side bypass channel 65a is included. In addition, the bypass channel 65 includes, on the other side in the longitudinal direction, the other side bypass channel 65b that connects the other end in the width direction of the branch channel 25a4 and the other end of the branch channel 27a4. Here, a liquid supply channel 66 is provided in the plate 7d of the second channel member 7. As shown in FIG. In this case, in a mode in which one half of the branch channel 25a3 in the longitudinal direction is not provided, the liquid supply channel 66 has one longitudinal end of the branch channel 25a3 and a branch channel arranged on the one longitudinal side of the branch channel 25a3. 25a4 is connected to the other end in the width direction. Such a configuration allows the liquid to flow smoothly within the integrated supply channel 25 . In FIG. 14, the liquid supply channel 66 is provided only on one side in the longitudinal direction. However, the present invention is not limited to this. A liquid supply path 66 may be provided in the same manner as on one side.

Furthermore, in the above embodiment, the damper portion 29B is formed under the feedback manifold 23, but the damper portion 29B is not an essential component, and the damper portion may not be under the feedback manifold 23. .

3 liquid ejection head 9 nozzle hole 21 supply manifold 23 return manifold 25 supply integration channel 27 recovery integration channel 65, 165 bypass channel 65a one side bypass channel 65b other side bypass channel 66 liquid supply channel 225a4 individual integration channel FT filter

Claims (9)

a plurality of supply manifolds having a long dimension and arranged side by side in a width direction intersecting with the longitudinal direction to supply liquid to the nozzles;
a plurality of return manifolds extending in the longitudinal direction and arranged side by side in the width direction, into which liquid not ejected by the nozzles flows;
A plurality of individual streams having an upstream end connected to the supply manifold and a downstream end connected to the return manifold, and individually communicating with a plurality of nozzles arranged in rows in the longitudinal direction of the supply manifold. road and
a supply integration channel provided at one longitudinal end of the supply manifold for supplying liquid to the plurality of supply manifolds;
a recovery integration channel provided at one longitudinal end of the supply manifold for recovering liquid from the plurality of return manifolds;
A liquid ejection head, comprising: a bypass flow path that connects the integrated supply flow path and the integrated recovery flow path. the supply integration channel extends in the width direction so as to span the plurality of supply manifolds;
The bypass flow path includes a one-end bypass flow path provided at one end side of the integrated supply flow path in the width direction and a other end side bypass flow path provided at the other end side of the integrated supply flow path in the width direction. 2. The liquid ejection head of claim 1, including channels. the supply integration channel extends in the width direction so as to span the plurality of supply manifolds;
The bypass channel includes a one end side bypass channel provided at one end side of the supply integration channel in the width direction,
2. The liquid ejection head according to claim 1, further comprising a liquid supply channel, one end of which is connected to the other end in the width direction of the integrated supply channel. The supply integration channel is formed by a plurality of stacked plates,
4. The liquid ejection head according to claim 1, wherein said bypass channel is formed in at least the uppermost plate among said plurality of plates. 5. The liquid ejection head according to claim 1, wherein a flow path resistance of said bypass flow path is higher than a combined resistance of flow paths from said supply manifold to said return manifold via said nozzles. The integrated supply channel includes a plurality of individual integrated channels individually connected to each of the plurality of supply manifolds,
6. The liquid ejection head according to claim 5, wherein the dimension in the width direction of the individual integrated channel is the same as the dimension in the width direction of the supply manifold. 7. The liquid ejection head according to any one of claims 1 to 6, further comprising a filter disposed between said bypass channel and said supply manifold in said integrated supply channel. 8. The liquid ejection head according to any one of claims 1 to 7, wherein no filter is arranged in said recovery integration channel. The supply integration channel is formed by combining the openings of a plurality of stacked plates, and the openings of the plurality of plates are smaller the higher the plate is, thereby forming a tapered shape. The liquid ejection head according to any one of claims 1 to 8.

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