JP6672913B2 - Liquid discharge head, liquid discharge unit, device for discharging liquid - Google Patents

Description

  The present invention relates to a liquid discharge head, a liquid discharge unit, and a device for discharging liquid.

  In the liquid ejection head, it is necessary to reduce or prevent mutual interference, ejection failure, liquid dripping, and the like caused by the propagation of the pressure wave generated by the liquid ejection to the common liquid chamber.

  Therefore, conventionally, a flow path plate that forms a plurality of individual liquid chambers through which a plurality of nozzles that eject droplets communicates, a common liquid chamber member that forms a common liquid chamber that supplies liquid to the plurality of individual liquid chambers, A wall member forming a deformable damper region on a part of the wall surface of the liquid chamber member, wherein the flow path plate and the common liquid chamber member are laminated with the wall member interposed therebetween; There is a configuration in which a concave damper chamber corresponding to the above is formed, and a pillar portion connected to the wall surface of the wall member facing in the laminating direction is provided at the concave bottom of the damper chamber (Patent Document 1). ).

JP 2015-186901 A

  Incidentally, the length of the common liquid chamber in the nozzle arrangement direction is substantially the same as the length of the nozzle row (individual liquid chamber row) in order to reduce the retention of bubbles at both ends. Therefore, on the end side and the center side in the nozzle arrangement direction, the rigidity at the nozzle row end side where the walls at both ends of the common liquid chamber are present is relatively high, and the rigidity at the nozzle row center is relatively high. Lower.

  As a result, the pressure generated in the individual liquid chamber at the center in the nozzle arrangement direction is partially absorbed by the deformation, so that in one nozzle row, the ejection characteristics of the nozzle at the center in the nozzle arrangement direction and the nozzle arrangement There is a problem that a variation occurs with the ejection characteristics of the nozzle at the end of the direction.

  The present invention has been made in view of the above problems, and has as its object to reduce the variation in ejection characteristics.

In order to solve the above-mentioned problems, a liquid discharge head according to claim 1 of the present invention is provided.
A common liquid chamber member that forms a common liquid chamber that supplies the liquid to a plurality of individual liquid chambers through which nozzles that discharge the liquid communicate;
A damper forming a part of the wall surface of the common liquid chamber,
In the common liquid chamber member, in the nozzle arrangement direction, has a lightening portion via partition walls on both sides of the common liquid chamber,
The damper also forms a wall surface of the lightening portion of the common liquid chamber member,
The damper is provided with a rib for partitioning the damper into a plurality of damper regions in a nozzle arrangement direction,
The ribs of the damper and the partition of the common liquid chamber member are displaced in the nozzle arrangement direction ,
The common liquid chamber is divided into an upstream common liquid chamber and a downstream common liquid chamber by a filter for filtering foreign substances,
The common liquid chamber member is a member forming the downstream common liquid chamber,
The rib of the damper is arranged on the side facing the downstream common liquid chamber in the nozzle arrangement direction .

  According to the present invention, it is possible to reduce variations in ejection characteristics.

FIG. 1 is an explanatory perspective view showing the appearance of an example of a liquid ejection head according to the present invention. FIG. 2 is a cross-sectional explanatory view in a direction orthogonal to a nozzle arrangement direction along line XX in FIG. 1. FIG. 3 is an explanatory sectional view taken along line AA of FIG. FIG. 4 is an explanatory cross-sectional view along a nozzle arrangement direction corresponding to line BB of FIG. 3 used for describing the first embodiment of the present invention. FIG. 4 is an explanatory plan view of the channel plate viewed from the diaphragm member side. FIG. 6 is an explanatory plan view of the diaphragm member viewed from a second common liquid chamber member side. It is a plane explanatory view of a 2nd common liquid chamber member similarly. FIG. 5 is an enlarged sectional explanatory view of a main part of FIG. It is a principal part expanded sectional explanatory view used for description of 2nd Embodiment of this invention. It is a principal part enlarged sectional explanatory view used for description of 3rd Embodiment of this invention. FIG. 2 is an explanatory plan view of a main part of an example of an apparatus for discharging liquid according to the present invention. It is a principal part side explanatory view of the same apparatus. FIG. 11 is an explanatory plan view of a main part of another example of the liquid ejection unit according to the present invention. FIG. 13 is a front explanatory view of still another example of the liquid ejection unit according to the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. An example of the liquid ejection head according to the present invention will be described with reference to FIGS. 1 is a perspective explanatory view of the appearance of the head, FIG. 2 is a sectional explanatory view in a direction orthogonal to the nozzle arrangement direction along line XX in FIG. 1, and FIG. 3 is a sectional explanatory view along line AA in FIG. It is.

  The liquid discharge head includes a nozzle plate 2, a flow path plate 3 serving as a flow path member, a vibration plate member 4 serving also as a damper member and a wall member, and a second common liquid chamber member 5 serving as a common liquid chamber member. The filter member 6 and the first common liquid chamber member 7 are laminated and joined.

  A plurality of nozzles 20 for discharging droplets are arranged in a staggered two rows on the nozzle plate 2. The nozzle plate 2 forms the nozzle 20 by press working using, for example, stainless steel (here, SUS316).

  The flow path plate 3 forms an individual liquid chamber 21 that is an individual liquid chamber that communicates with the nozzle 20, a fluid resistance part 27 that communicates with the individual liquid chamber 21, and a liquid introduction part 28 that communicates with the fluid resistance part 27. The flow path plate 3 was formed by press working using, for example, stainless steel (SUS316 in this case), and was subjected to post-processing so that deformation and burrs due to pressing were almost flat by double-side polishing.

  The diaphragm member 4 forms a part of the wall surface of the individual liquid chamber 21 as a displaceable vibration region 4a. The diaphragm member 4 has a liquid supply passage 22 facing the common liquid chamber 25 below the filter, which is a common liquid chamber on the downstream side, and passing through the common liquid chamber 25 under the filter and the liquid introduction part 28 of each individual liquid chamber 21. Is formed. The diaphragm member 4 can be formed by, for example, Ni electroforming.

  A second common liquid chamber member 5, a filter member 6, and a first common liquid chamber member 7, which also serves as a frame of the head, are sequentially laminated on the side of the diaphragm member 4 opposite to the individual liquid chamber 21, and are joined with an adhesive. doing.

  The first common liquid chamber member 7 and the second common liquid chamber member 5 form a common liquid chamber 10 communicating with each individual liquid chamber 21. The common liquid chamber 10 includes an upper filter common liquid chamber 26 that is an upstream common liquid chamber upstream of the filter member 6 and a lower filter common liquid chamber 25 that is a downstream downstream liquid chamber. . The upper common liquid chamber 26 is a common liquid chamber to which liquid is supplied from the outside and which discharges the liquid to the outside.

  The filter member 6 is provided with a filter region 29 in which a large number of filter holes are formed, and traps foreign matter from the liquid flowing from the common liquid chamber 26 above the filter to the common liquid chamber 25 below the filter.

  The first common liquid chamber member 7 forms a common liquid chamber 26 above the filter, and as shown in FIG. 4 to be described later, a liquid supply port 61 for supplying liquid from outside and a liquid discharge port for discharging liquid to outside. An outlet 62 is provided.

  The piezoelectric actuator 8 is arranged on the side of the vibration area 4 a of the vibration plate member 4 opposite to the individual liquid chamber 21.

  In the piezoelectric actuator 8, two piezoelectric members 32 in which columnar piezoelectric elements (piezoelectric columns) 32A are formed on one base member 33 at a pitch of, for example, half the nozzle pitch in accordance with two nozzle rows. Each piezoelectric column of the piezoelectric member 32 is joined to the convex portion 4b formed in the vibration region 4a of the vibration plate member 4, and a drive signal is given from the drive IC 81 provided in the flexible wiring member 34 via the flexible wiring member 34. .

  The flow path plate 3 and the common liquid chamber member (second common liquid chamber member 5) are laminated with the diaphragm member 4 as a wall member interposed therebetween.

  The diaphragm member 4 also serves as a damper member, and forms a deformable damper 24 that forms a wall surface of the common liquid chamber 25 below the filter. A damper chamber 35 is formed in the flow path plate 3 so as to face the common liquid chamber 25 under the filter with the damper 24 interposed therebetween.

  The damper chamber 35 is open to the atmosphere through an atmosphere opening channel 42 formed in the flow path plate 3, an atmosphere opening hole 43 formed in the diaphragm member 4, and an atmosphere opening channel 44 formed in the piezoelectric member 32.

  In this liquid discharge head, the piezoelectric actuator 8 is driven to displace the vibration area 4 a of the vibration plate member 4, the liquid in the individual liquid chamber 21 is pressurized, and the liquid droplet is discharged from the nozzle 20.

  Next, a first embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a cross-sectional explanatory view taken along a nozzle arrangement direction corresponding to line BB in FIG. 3 for explaining the embodiment, FIG. 5 is a plan explanatory view of the channel plate viewed from the diaphragm member side, and FIG. FIG. 7 is a plan view of the diaphragm member viewed from the second common liquid chamber member side, FIG. 7 is a plan view of the second common liquid chamber member, and FIG. 8 is an enlarged sectional view of a main part of FIG. .

  The second common liquid chamber member 5 is provided with a through-hole portion 25a which forms a common liquid chamber under the filter 25 having substantially the same length as the nozzle row along the nozzle arrangement direction. In addition, as shown in FIG. 7, a through hole 58 for disposing the piezoelectric actuator 8 is provided at the center.

  In the second common liquid chamber member 5, lightening portions 25 b are provided on both sides of the common liquid chamber 25 below the filter via a partition wall 51 in the nozzle arrangement direction. That is, in the nozzle arrangement direction, the lightening portion 25b formed of a through hole or a recess is provided outside the outermost nozzle 20 (individual liquid chamber 21).

  In the present embodiment, as shown in FIG. 8, the chamber 52 formed by the lightening portion 25b is an open-to-atmosphere chamber that is open to the atmosphere.

  The damper 24 also forms the wall surface of the lightening portion 25b (chamber 52) of the second common liquid chamber member 5.

  A concave damper chamber 35 corresponding to the damper 24 is formed along the nozzle arrangement direction on the end side of the flow path plate 3 in a direction orthogonal to the nozzle arrangement direction.

  The damper chamber 35 faces the common liquid chamber 25 below the filter and the lightening portion 25b (chamber 52) with the damper 24 interposed therebetween. Accordingly, in the nozzle arrangement direction, the damper chamber 35 extends to the outside of the individual liquid chambers 21 located at the end of the plurality of individual liquid chambers 21 in the nozzle arrangement direction.

  At both ends of the damper chamber 35 in the nozzle arrangement direction, open-to-atmosphere paths 42 that open the damper chamber 35 to the atmosphere (open to the atmosphere) are provided. As described above, the open-to-atmosphere path 42 communicates with the atmosphere through the open-to-atmosphere hole 43 of the diaphragm member 4 and the open-to-atmosphere path 44 of the piezoelectric member 32, and the damper chamber 35 is open to the atmosphere.

  In FIG. 4, a wall 35a, which is a column supporting the damper 24, is provided at the concave bottom of the damper chamber 35, but FIG. 5 shows an example of a configuration without the wall 35a.

  Further, the damper 24 is provided with a plurality of ribs 55 arranged in the nozzle arrangement direction and is divided into a plurality of damper regions 24a. One damper region 24a corresponds to two or more individual liquid chambers 21.

  In the present embodiment, the rib 55 is formed integrally with the damper 24, but a member on which the rib 55 is formed may be attached to the damper 24.

  The rib 55 of the damper 24 and the partition 51 of the second common liquid chamber member 5 are displaced from each other in the nozzle arrangement direction. That is, the rib 55 of the damper 24 is provided at a position shifted in the nozzle arrangement direction with respect to the partition wall 51 of the second common liquid chamber member 5.

  In the present embodiment, the rib 55 of the damper 24 is shifted to the side facing the lightening portion 25b of the second common liquid chamber member 5.

  As a result, since the partition wall 51 of the second common liquid chamber member 5 and the damper 24 are not directly joined via the rib 55, the influence of the rigidity of the partition wall 51 of the second common liquid chamber member 5 forms the damper 24. Irrespective of the vibrating plate member 4, uniform rigidity in the nozzle arrangement direction of the head can be obtained.

  Therefore, it is possible to reduce the variation in the ejection characteristics of the nozzles at the end in the nozzle array direction and the variation in the ejection characteristics of the nozzles at the center, particularly the variation in the ejection speed.

  Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 9 is an enlarged sectional explanatory view of a main part used for describing the embodiment.

  In the present embodiment, the rib 55 of the damper 24 is shifted to the side of the second common liquid chamber member 5 facing the common liquid chamber 25 below the filter.

  Thereby, the liquid flowing from the common liquid chamber 26 above the filter to the common liquid chamber 25 below the filter can be smoothly supplied to the individual liquid chamber 21.

  In other words, in the configuration of the first embodiment, since the lower common liquid chamber 25 of the filter communicates with the gap between the partition wall 51 of the second common liquid chamber member 5 and the damper 24, the flow of the liquid is reduced. Stagnation may occur and bubbles may be trapped. On the other hand, since the common liquid chamber 25 below the filter does not communicate with the gap between the partition wall 51 of the second common liquid chamber member 5 and the damper 24, no stagnation occurs in the flow of liquid, and trapping of air bubbles is prevented. Without this, the liquid smoothly flows to the individual liquid chamber 21 side.

  Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 10 is an enlarged sectional explanatory view of a main part used for describing the same embodiment.

  In the present embodiment, similarly to the first embodiment, the rib 55 of the damper 24 is shifted toward the filter lower common liquid chamber 25 with respect to the partition wall 51 of the second common liquid chamber member 5. The gap between the partition wall 51 of the second common liquid chamber member 5 and the damper 24 is filled with a filler 57 having a Young's modulus lower than that of the damper 24 to fill the gap. ing.

  Thereby, it is possible to prevent the bubbles under the filter from being trapped in the gap between the partition 51 and the damper 24 of the second common liquid chamber member 5.

  Next, an example of an apparatus for discharging a liquid according to the present invention will be described with reference to FIGS. FIG. 11 is an explanatory plan view of a main part of the apparatus, and FIG. 12 is an explanatory side view of an essential part of the apparatus.

  This device is a serial type device, and the carriage 403 reciprocates in the main scanning direction by the main scanning moving mechanism 493. The main scanning movement mechanism 493 includes a guide member 401, a main scanning motor 405, a timing belt 408, and the like. The guide member 401 is bridged between the left and right side plates 491A and 491B, and movably holds the carriage 403. The carriage 403 is reciprocated in the main scanning direction by the main scanning motor 405 via a timing belt 408 spanned between the driving pulley 406 and the driven pulley 407.

  On the carriage 403, a liquid discharge unit 440 in which the liquid discharge head 404 and the head tank 441 according to the present invention are integrated is mounted. The liquid discharge head 404 of the liquid discharge unit 440 discharges, for example, liquid of each color of yellow (Y), cyan (C), magenta (M), and black (K). The liquid ejection head 404 has a nozzle row composed of a plurality of nozzles arranged in a sub-scanning direction orthogonal to the main scanning direction, and is mounted with the ejection direction facing downward.

  The liquid stored in the liquid cartridge 450 is supplied to the head tank 441 by a supply mechanism 494 for supplying the liquid stored outside the liquid discharge head 404 to the liquid discharge head 404.

  The supply mechanism 494 includes a cartridge holder 451, which is a filling section for mounting the liquid cartridge 450, a tube 456, a liquid sending unit 452 including a liquid sending pump, and the like. The liquid cartridge 450 is detachably mounted on the cartridge holder 451. The liquid is sent from the liquid cartridge 450 to the head tank 441 by the liquid sending unit 452 via the tube 456.

  This apparatus includes a transport mechanism 495 for transporting the sheet 410. The transport mechanism 495 includes a transport belt 412 as transport means, and a sub-scanning motor 416 for driving the transport belt 412.

  The transport belt 412 attracts the paper 410 and transports the paper 410 at a position facing the liquid ejection head 404. The transport belt 412 is an endless belt, and is stretched between a transport roller 413 and a tension roller 414. Suction can be performed by electrostatic suction or air suction.

  The transport belt 412 is rotated in the sub-scanning direction by rotating the transport roller 413 via the timing belt 417 and the timing pulley 418 by the sub-scanning motor 416.

  Further, on one side of the carriage 403 in the main scanning direction, a maintenance and recovery mechanism 420 for maintaining and recovering the liquid ejection head 404 is arranged on the side of the transport belt 412.

  The maintenance and recovery mechanism 420 includes, for example, a cap member 421 for capping the nozzle surface (the surface on which the nozzle is formed) of the liquid ejection head 404, a wiper member 422 for wiping the nozzle surface, and the like.

  The main scanning movement mechanism 493, the supply mechanism 494, the maintenance and recovery mechanism 420, and the transport mechanism 495 are attached to a housing including side plates 491A and 491B and a back plate 491C.

  In this apparatus configured as described above, the paper 410 is fed onto the transport belt 412 and is adsorbed, and the paper 410 is transported in the sub-scanning direction by the orbital movement of the transport belt 412.

Therefore, by driving the liquid ejection head 404 according to the image signal while moving the carriage 403 in the main scanning direction, the liquid is ejected to the stopped paper 410 to form an image.

  As described above, since this apparatus includes the liquid ejection head according to the present invention, a high-quality image can be stably formed.

  Next, another example of the liquid ejection unit according to the present invention will be described with reference to FIG. FIG. 13 is an explanatory plan view of a main part of the unit.

  The liquid discharge unit includes a housing portion including side plates 491A and 491B and a back plate 491C, a main scanning moving mechanism 493, a carriage 403, It comprises a discharge head 404.

  In addition, a liquid discharge unit in which at least one of the above-described maintenance and recovery mechanism 420 and the supply mechanism 494 is further attached to, for example, the side plate 491B of the liquid discharge unit may be configured.

  Next, still another example of the liquid ejection unit according to the present invention will be described with reference to FIG. FIG. 14 is an explanatory front view of the unit.

  The liquid discharge unit includes a liquid discharge head 404 to which a flow path component 444 is attached, and a tube 456 connected to the flow path component 444.

  The flow path component 444 is disposed inside the cover 442. A head tank 441 may be included instead of the flow path component 444. Further, a connector 443 for making an electrical connection with the liquid ejection head 404 is provided above the flow path component 444.

  In the present application, the liquid to be discharged is not particularly limited as long as it has a viscosity and surface tension that can be discharged from the head, and the viscosity becomes 30 mPa · s or less at normal temperature and normal pressure, or by heating and cooling. Preferably, it is More specifically, solvents such as water and organic solvents, coloring agents such as dyes and pigments, polymerizable compounds, resins, functional imparting materials such as surfactants, and biocompatible materials such as DNA, amino acids, proteins, and calcium. , Edible materials such as natural pigments, and the like, solutions, suspensions, emulsions, and the like. These include, for example, ink-jet inks, surface treatment liquids, components of electronic elements and light-emitting elements, and formation of resist patterns for electronic circuits. Liquid, three-dimensional modeling material liquid, and the like.

  As the energy generation source for discharging liquid, piezoelectric actuators (laminated piezoelectric elements and thin-film piezoelectric elements), thermal actuators using electrothermal transducers such as heating resistors, and electrostatic actuators composed of a diaphragm and a counter electrode are used. Are included.

  The “liquid ejection unit” is a liquid ejection head in which functional components and mechanisms are integrated, and includes an assembly of components related to liquid ejection. For example, the “liquid ejection unit” includes a combination of at least one of a head tank, a carriage, a supply mechanism, a maintenance and recovery mechanism, and a main scanning movement mechanism with a liquid ejection head.

  Here, the term “integration” means, for example, a case where the liquid ejection head and the functional component or mechanism are fixed to each other by fastening, bonding, engagement, or the like, or a case where one is movably held with respect to the other. Including. Further, the liquid ejection head, the functional component, and the mechanism may be configured to be detachable from each other.

  For example, there is a liquid discharge unit in which a liquid discharge head and a head tank are integrated. In some cases, the liquid ejection head and the head tank are integrated with each other by a tube or the like. Here, a unit including a filter can be added between the head tank and the liquid discharge head of these liquid discharge units.

  There is a liquid discharge unit in which a liquid discharge head and a carriage are integrated.

  Further, as a liquid discharge unit, there is a liquid discharge head in which a liquid ejection head is movably held by a guide member constituting a part of a scanning movement mechanism, and the liquid ejection head and the scanning movement mechanism are integrated. In some cases, a liquid discharge head, a carriage, and a main scanning moving mechanism are integrated.

  Further, as a liquid discharge unit, there is a liquid discharge head in which a cap member which is a part of a maintenance / recovery mechanism is fixed to a carriage to which a liquid discharge head is attached, and the liquid discharge head, the carriage, and the maintenance / recovery mechanism are integrated. .

  Further, as a liquid discharge unit, there is a liquid discharge head in which a tube is connected to a liquid discharge head to which a head tank or a flow path component is attached, and a liquid discharge head and a supply mechanism are integrated. The liquid in the liquid storage source is supplied to the liquid ejection head via this tube.

  The main scanning movement mechanism includes a guide member alone. The supply mechanism also includes a tube unit and a loading unit alone.

The “device that discharges liquid” includes a device that includes a liquid discharge head or a liquid discharge unit and drives the liquid discharge head to discharge liquid. The device that discharges liquid includes not only a device that can discharge liquid to an object to which liquid can be attached, but also a device that discharges liquid into the air or into the liquid.

  The “device for discharging liquid” may include a unit for feeding, transporting, and discharging paper to which liquid can be attached, as well as a pre-processing device and a post-processing device.

  For example, as a "device for ejecting liquid", an image forming apparatus that ejects ink to form an image on paper, and a powder is formed in layers to form a three-dimensional object (three-dimensional object) There is a three-dimensional modeling device (three-dimensional modeling device) that discharges a modeling liquid to the formed powder layer.

  Further, the “device for discharging liquid” is not limited to a device in which a significant image such as a character or a graphic is visualized by the discharged liquid. For example, those that form a pattern or the like that has no meaning in itself, and those that form a three-dimensional image are also included.

  The above-mentioned "thing to which a liquid can be attached" means a thing to which a liquid can be attached at least temporarily, such as a thing which adheres and adheres, a thing which adheres and penetrates, and the like. Specific examples include recording media such as paper, recording paper, recording paper, film, and cloth; electronic components such as electronic substrates and piezoelectric elements; powder layers (powder layers); organ models; and media such as inspection cells. Yes, unless otherwise specified, includes everything to which a liquid adheres.

  The material of the above-mentioned "thing to which the liquid can be attached" may be paper, thread, fiber, cloth, leather, metal, plastic, glass, wood, ceramics, etc. as long as the liquid can be attached even temporarily.

  In addition, the “device for discharging liquid” includes a device in which a liquid discharge head and a device to which liquid can adhere are relatively moved, but are not limited thereto. Specific examples include a serial device that moves the liquid ejection head, a line device that does not move the liquid ejection head, and the like.

  In addition, as the "device for discharging liquid", in addition, a processing liquid coating apparatus for discharging a processing liquid to the paper to apply the processing liquid to the surface of the paper for the purpose of modifying the surface of the paper, 2. Description of the Related Art There is an injection granulating apparatus in which a composition liquid in which a raw material is dispersed in a solution is sprayed through a nozzle to granulate fine particles of the raw material.

  Note that, in the terms of the present application, image formation, recording, printing, printing, printing, modeling, and the like are all synonyms.

2 Nozzle plate 3 Flow path plate 4 Vibration plate member (damper member)
Reference Signs List 5 second common liquid chamber member 6 filter member 7 first common liquid chamber member 8 piezoelectric actuator 10 common liquid chamber 20 nozzle 21 pressure chamber (individual liquid chamber)
24 damper 32 piezoelectric member 35 damper chamber 51 partition wall 55 rib 403 carriage 404 liquid discharge head 440 liquid discharge unit

Claims (7)

A common liquid chamber member that forms a common liquid chamber that supplies the liquid to a plurality of individual liquid chambers through which nozzles that discharge the liquid communicate;
A damper forming a part of the wall surface of the common liquid chamber,
In the common liquid chamber member, in the nozzle arrangement direction, has a lightening portion via partition walls on both sides of the common liquid chamber,
The damper also forms a wall surface of the lightening portion of the common liquid chamber member,
The damper is provided with a rib for partitioning the damper into a plurality of damper regions in a nozzle arrangement direction,
The ribs of the damper and the partition of the common liquid chamber member are displaced in the nozzle arrangement direction,
The common liquid chamber is divided into an upstream common liquid chamber and a downstream common liquid chamber by a filter for filtering foreign substances,
The common liquid chamber member is a member forming the downstream common liquid chamber,
Ribs of the damper, in the nozzle array direction, the liquid discharge head characterized in that it is arranged on the side facing the downstream common liquid chamber. A common liquid chamber member that forms a common liquid chamber that supplies the liquid to a plurality of individual liquid chambers through which nozzles that discharge the liquid communicate;
A damper forming a part of the wall surface of the common liquid chamber,
In the common liquid chamber member, in the nozzle arrangement direction, has a lightening portion via partition walls on both sides of the common liquid chamber,
The damper also forms a wall surface of the lightening portion of the common liquid chamber member,
The damper is provided with a rib for partitioning the damper into a plurality of damper regions in a nozzle arrangement direction,
The ribs of the damper and the partition of the common liquid chamber member are displaced in the nozzle arrangement direction,
The common liquid chamber is divided into an upstream common liquid chamber and a downstream common liquid chamber by a filter for filtering foreign substances,
The common liquid chamber member is a member forming the downstream common liquid chamber,
Ribs of the damper, in the nozzle array direction, the liquid discharge head characterized in that it is arranged on the side facing the lightening portion. A common liquid chamber member that forms a common liquid chamber that supplies the liquid to a plurality of individual liquid chambers through which nozzles that discharge the liquid communicate;
A damper forming a part of the wall surface of the common liquid chamber,
In the common liquid chamber member, in the nozzle arrangement direction, has a lightening portion via partition walls on both sides of the common liquid chamber,
The damper also forms a wall surface of the lightening portion of the common liquid chamber member,
The damper is provided with a rib for partitioning the damper into a plurality of damper regions in a nozzle arrangement direction,
The ribs of the damper and the partition of the common liquid chamber member are displaced in the nozzle arrangement direction,
The common liquid chamber is divided into an upstream common liquid chamber and a downstream common liquid chamber by a filter for filtering foreign substances,
The common liquid chamber member is a member forming the downstream common liquid chamber,
Between the partition wall of the common liquid chamber member and damper area of the damper, the liquid discharge head you characterized by low filler Young's modulus than the damper is filled.   A filler having a Young's modulus lower than that of the damper is filled between the damper region of the damper and the partition wall of the common liquid chamber member.
The liquid ejection head according to claim 1, wherein A liquid discharge unit, characterized in that it comprises a liquid discharge head according to any one of claims 1 to 4. A head tank for storing liquid to be supplied to the liquid discharge head, a carriage on which the liquid discharge head is mounted, a supply mechanism for supplying liquid to the liquid discharge head, a maintenance and recovery mechanism for maintaining and recovering the liquid discharge head, and the liquid The liquid ejection unit according to claim 5 , wherein at least one of a main scanning movement mechanism for moving the ejection head in the main scanning direction and the liquid ejection head are integrated. Claims 1 to liquid discharge head according to any one of 4, or a device for ejecting a liquid, characterized in that it comprises a liquid discharge unit according to claim 5 or 6.

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