JP6950552B2 - Liquid discharge head, liquid discharge unit and device that discharges liquid - Google Patents

Description

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

As an image forming apparatus for printers, facsimiles, copying devices, plotters, and multifunction devices thereof, for example, image forming of a liquid ejection recording method using a recording head including a liquid ejection head (droplet ejection head) for ejecting ink droplets. Devices (eg, inkjet recording devices) are known.

The inkjet recording device means a paper (not limited to paper, including OHP, etc., to which ink droplets, other liquids, etc. can adhere) to which ink droplets are conveyed from a recording head, and is a recording medium or a recording medium. It is also called a recording medium, a recording paper, a recording paper, etc.) to form an image (recording, printing, printing, and printing are also used as synonyms), and is used on a recording head. On the other hand, while moving the paper relatively, ink droplets are adhered to the paper by ejecting ink from the recording head in response to the printing signal, and the ink dots form an image on the paper.
As such an inkjet recording device, an on-demand type device that ejects minute droplets of ink only when recording is required is the mainstream.

As an ink ejection method, a vibrating plate is provided on a part of the wall of the liquid chamber filled with ink, and the vibrating plate is displaced by a piezoelectric actuator or the like to increase the pressure in the liquid chamber and eject ink droplets from the nozzle. There are known a piezoelectric type and a thermal type in which a heating element that generates heat when energized is provided in the liquid chamber, and the pressure in the liquid chamber is increased by bubbles generated by the heat generated by the heating element to eject ink droplets. In either method, the pressure generation source is driven by a drive signal from the drive circuit for driving the device, and ink droplets are ejected from the nozzles and adhered to the recording medium.

When the individual liquid chambers are pressurized to eject droplets, the pressure fluctuation becomes a pressure wave and propagates to the common liquid chamber that supplies the liquid to the plurality of individual liquid chambers. When the pressure wave propagating in this common liquid chamber propagates back to the individual liquid chambers, the pressure in the individual liquid chambers fluctuates, the meniscus of the nozzle cannot be controlled, and droplets are discharged at the required drop velocity and drop volume (drop volume). It will not be possible to discharge or it will cause non-discharge. In addition, when the pressure wave propagating in the common liquid chamber propagates to the adjacent individual liquid chambers and causes mutual interference that affects the liquid, unintended leakage of droplets from the nozzle, discharge, and unstable discharge state ( Crosstalk) will be triggered.

To solve this problem, it is known that a damper structure is provided in a part of a liquid chamber or a flow path to make it difficult for pressure to be transmitted to an adjacent nozzle. Further, in a liquid discharge head having a circulation function, there is also known a technique of providing a gas storage unit in order to reduce crosstalk and using the stored gas as a damper (see, for example, Patent Document 1).

In Patent Document 1, a water stop area is formed, a common recovery path for collecting liquid from the recovery path is provided, a storage portion for collecting air bubbles is provided in the water stop area, and the flow path resistance of the recovery path is higher than the flow path resistance of the supply path. A droplet ejection head that is small and easily propagates pressure fluctuations generated in a pressure chamber during ink ejection to a common recovery path rather than a common supply path has been proposed.

In the conventional technology of using the stored gas as a damper, there is a problem that the ink volume is increased by providing a storage portion for accommodating the gas, and a control mechanism such as a sensor is used to keep the amount of gas constant. It may be necessary, and there is a problem that the size of the device is increased and the cost is increased.
It is said that the droplet ejection head of Patent Document 1 is also preferably provided with a means for detecting air bubbles in the common collection path, and it is difficult to realize miniaturization and cost reduction by providing such a control mechanism. There is a risk.

Therefore, the present invention provides a liquid discharge head capable of storing a certain amount of gas without providing a control mechanism, obtaining discharge stability due to the damper effect, and realizing miniaturization and cost reduction. With the goal.

In order to solve the above problems, the liquid discharge head of the present invention is provided in a nozzle plate in which a plurality of nozzles for discharging droplets are formed, a plurality of individual liquid chambers communicating with the plurality of nozzles, and the individual liquid chambers. A flow path plate member that forms a supply flow path for supplying a liquid and a circulation flow path that communicates with the individual liquid chamber and collects a part of the liquid in the individual liquid chamber, and supplies the liquid to the supply flow path. The buffer chamber includes at least a common supply liquid chamber, a common circulating liquid chamber for accommodating a liquid from the circulation flow path, and a frame member having a buffer chamber having a space capable of storing a gas, and the buffer chamber is the flow. It is characterized by having a gas permeable film that communicates with the circulation flow path via a buffer flow path formed in a road plate member and / or a frame member and allows only a gas to permeate inside.

According to the present invention, it is possible to provide a liquid discharge head capable of storing a certain amount of gas without providing a control mechanism, obtaining discharge stability due to a damper effect, and realizing miniaturization and cost reduction. Can be done.

It is sectional drawing which shows an example of the conventional liquid discharge head to which this invention is applied. It is sectional drawing of the liquid discharge head which concerns on 1st Embodiment of this invention. It is sectional drawing of the liquid discharge head which concerns on 2nd Embodiment of this invention. It is sectional drawing of the liquid discharge head which concerns on 3rd Embodiment of this invention. It is a side explanatory view of the main part which shows an example of the apparatus which discharges a liquid which concerns on this invention. It is a plane explanatory view of the main part which shows an example of the liquid discharge unit which concerns on this invention. It is a front explanatory view which shows another example of the liquid discharge unit which concerns on this invention.

Hereinafter, the liquid discharge head, the liquid discharge unit, and the device for discharging the liquid according to the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments shown below, and can be modified within the range conceivable by those skilled in the art, such as other embodiments, additions, modifications, and deletions. However, as long as the action and effect of the present invention are exhibited, it is included in the scope of the present invention.

FIG. 1 shows a cross-sectional view in a direction orthogonal to the nozzle arrangement direction of a conventional inkjet head as a liquid discharge head to which the present invention can be applied.
This liquid discharge head includes a frame member in which an ink supply port 1a, a common supply liquid chamber 1b, an ink discharge port 1c, and a common circulation liquid chamber 1d are formed, a fluid resistance portion 2a, and an individual liquid chamber (pressure generation chamber) 2b. It has a supply flow path plate 2C in which the supply flow path 2d is formed.

Further, the liquid discharge head includes a communication flow path plate 2B in which a communication port 2c for communicating the supply flow path 2d and the circulation flow path 2e via the individual liquid chamber 2b and a circulation flow path plate 2B in which the circulation flow path 2e is formed. It has a flow path plate 2A and a nozzle plate 3 in which a plurality of nozzles 3a are formed.

Further, the liquid discharge head includes a diaphragm 6 having a convex portion 6a and a diaphragm portion 6b, a laminated piezoelectric element 5 as an energy generating element bonded to the diaphragm 6, and a base 4 fixing the laminated piezoelectric element 5. And have.

The base 4 is made of, for example, a stainless steel material, and the laminated piezoelectric elements 5 are arranged in two rows and joined.

The laminated piezoelectric element 5 is divided into a comb-teeth shape by a half-cut dicing process, and each of them is used as a drive unit and a non-drive support unit. An FPC 8 on which a driver (not shown) is mounted is solder-bonded to the drive unit, thereby controlling the application of a drive voltage to the drive unit.

The diaphragm 6 has a thickness including a thin film diaphragm portion 6b, a convex portion 6a which is an island-shaped convex portion (island portion) joined to a driving portion of the laminated piezoelectric element 5 formed in the central portion of the diaphragm portion 6b, and a beam. It is formed by stacking two layers of a film portion and a nickel alloy-plated film having an opening formed by an electroforming method. The joint between the convex portion 6a and the drive portion and the joint between the diaphragm 6 and the frame member are formed by patterning and adhering an adhesive layer containing a gap material.

Examples of the material of the flow path plate member 2 including the circulation flow path plate 2A, the communication flow path plate 2B, and the supply flow path plate 2C include stainless steel. A fluid resistance portion 2a, a pressure generating chamber 2b, a communication port 2c, a common supply flow path 2d, and a common circulation flow path 2e can be manufactured from a stainless steel material by a pressing method. Further, a portion for narrowing the punching width can be provided and this can be used as the fluid resistance portion 2a.

The nozzle plate 3 is made of a metal material (for example, a stainless steel material), and a large number of nozzles 3a, which are fine ejection ports for flying ink droplets by press working, are formed.
The nozzle 3a is preferably formed so that its internal (inside) shape is tapered. For example, the nozzle 3a is formed so that the diameter is about 20 to 35 μm on the discharge side and the pitch is 150 dpi.
The frame member is made of, for example, a stainless steel material, and a common supply liquid chamber 1b, a common circulating liquid chamber 1d, and the like are formed by cutting.

In the liquid discharge head configured as described above, a drive waveform composed of a pulse voltage of 10 to 50 V is applied to the drive unit of the laminated piezoelectric element 5 according to the recording signal, so that the drive unit of the laminated piezoelectric element 5 is subjected to a drive waveform. A displacement in the stacking direction occurs, the individual liquid chamber 2b is pressurized via the vibrating plate 6, the pressure rises, and ink droplets are ejected from the nozzle 3a. After that, the ink pressure in the individual liquid chamber 2b decreases with the end of ink droplet ejection, and a negative pressure is generated in the individual liquid chamber 2b due to the inertia of the ink flow and the discharge process of the drive pulse, and the ink filling step. Move to.
At this time, the ink supplied from the ink tank flows into the common supply liquid chamber 1b, and is filled into the individual liquid chamber 2b from the common supply liquid chamber 1b via an ink inlet and a fluid resistance portion 2a (not shown).

The fluid resistance portion 2a is effective in damping the residual pressure vibration after ejecting ink droplets, but is resistant to refilling due to surface tension. By appropriately selecting the fluid resistance portion 2a, the damping of the residual pressure and the refill time can be balanced, and the time (driving cycle) until the next ink droplet ejection operation is started can be shortened.

However, in the conventional liquid discharge head having the above-described configuration, there is a problem that a damper structure cannot be formed between the supply flow path 2d and the circulation flow path 2e, which adversely affects the droplet discharge.
Therefore, the configuration of the liquid discharge head of the present invention that solves this problem will be described below.

[First Embodiment]
FIG. 2 shows a cross-sectional view in a direction orthogonal to the nozzle arrangement direction of the liquid discharge head according to the first embodiment of the present invention.
The liquid discharge head of the present embodiment includes a nozzle plate 3 in which a plurality of nozzles 3a for discharging droplets are formed, a plurality of individual liquid chambers (pressure generating chambers) 2b communicating with the plurality of nozzles 3a, and individual liquid chambers 2b. The flow path plate member 2 that communicates with the supply flow path 2d that supplies the liquid to the individual liquid chamber and the individual liquid chamber 2b to form the circulation flow path 2e that collects a part of the liquid in the individual liquid chamber, and the supply flow path 2d. At least a common supply liquid chamber 1b for supplying a liquid, a common circulating liquid chamber 1d for accommodating a liquid from a circulation flow path 2e, and a frame member 1 in which a buffer chamber 7a having a space capable of storing a gas is formed are provided. ing.

The buffer chamber 7a includes a gas permeable membrane 7b that communicates with the circulation flow path 2e via the buffer flow path 7c formed in the flow path plate member 2 and / or the frame member 1 and allows only gas to permeate inside. ..
Further, the buffer chamber 7a preferably has a structure that communicates with the atmosphere.

In the present embodiment, in the frame member 1, the common supply liquid chamber 1b, the common circulating liquid chamber 1d, and the buffer chamber 7a are formed in this order from the nozzle 3a side in the longitudinal direction of the circulation flow path 2e, and the buffer flow path 7c is formed in this order. It is formed on the flow path plate member 2 (communication flow path plate 2B, supply flow path plate 2C) and the frame member 1. One end of the buffer flow path 7c is open to the side end surface of the circulation flow path 2e.

The surface of the buffer chamber 7a in the direction opposite to gravity is open to the atmosphere, and a gas permeable membrane 7b is installed between the buffer chamber 7a and the open surface to the atmosphere.
The gas permeable membrane 7b is not particularly limited as long as it can permeate only gas (for example, air), and examples thereof include resin-made membranes. By providing the gas permeable membrane 7b, the gas can be easily stored in the buffer chamber 7a only by pressurization by a pump or the like or atmospheric pressure alone.

Since the gas overflowing from the buffer chamber 7a is discharged to the circulation flow path 2e via the buffer flow path 7c, the amount of gas in the buffer chamber 7a is kept substantially constant.

With the above configuration, a certain amount of gas can be stored in the buffer chamber 7a without providing a control mechanism, and discharge stability due to the damper effect can be obtained. Further, since a means such as a sensor for keeping the amount of gas constant is not required, it is possible to realize miniaturization and cost reduction.

[Second Embodiment]
FIG. 3 shows a cross-sectional view in a direction orthogonal to the nozzle arrangement direction of the liquid discharge head according to the second embodiment of the present invention.
In this embodiment, the arrangement positions of the buffer chamber 7a and the buffer flow path 7c are different from those in the first embodiment described above, but other configurations are the same.

In the present embodiment, in the frame member 1, the common supply liquid chamber 1b, the buffer chamber 7a, and the common circulating liquid chamber 1d are formed in this order from the nozzle 3a side in the longitudinal direction of the circulation flow path 2e, and the buffer flow path 7c is formed in this order. It is formed on the flow path plate member 2 (communication flow path plate 2B, supply flow path plate 2C) and the frame member 1.
One end of the buffer flow path 7c is open on the circulation flow path (the surface of the circulation flow path 2e along the flow direction).

Since the buffer chamber 7a in the present embodiment is arranged at a position closer to the nozzle 3a than in the first embodiment described above, it is possible to suppress the pressure fluctuation more quickly.
Further, as in the first embodiment, the gas overflowing from the buffer chamber 7a is discharged to the circulation flow path 2e via the buffer flow path 7c, so that the amount of gas in the buffer chamber 7a is kept substantially constant. Is done.

With the above configuration, a certain amount of gas can be stored in the buffer chamber 7a without providing a control mechanism, and discharge stability due to the damper effect can be obtained. Further, since a means such as a sensor for keeping the amount of gas constant is not required, it is possible to realize miniaturization and cost reduction.

[Third Embodiment]
FIG. 4 shows a cross-sectional view in a direction orthogonal to the nozzle arrangement direction of the liquid discharge head according to the third embodiment of the present invention.
In this embodiment, the arrangement positions of the buffer chamber 7a and the buffer flow path 7c are different from those in the first embodiment described above, but other configurations are the same.

In the present embodiment, in the frame member 1, the common supply liquid chamber 1b, the common circulating liquid chamber 1d, and the buffer chamber 7a are formed in this order from the nozzle 3a side in the longitudinal direction of the circulation flow path 2e, and the buffer flow path 7c is formed in this order. It is formed on the frame member 1.
One end of the buffer flow path 7c is open to the side end surface of the common circulating liquid chamber 1d.

In the present embodiment, since the buffer flow path 7c is formed only by the frame member 1, it is not necessary to process the flow path plate member 2. That is, the buffer chamber 7a and the buffer flow path 7c can be formed by only one component.
Further, as in the first embodiment, the gas overflowing from the buffer chamber 7a is discharged to the common circulating liquid chamber 1d communicating with the circulation flow path 2e via the buffer flow path 7c, so that the gas in the buffer chamber 7a is discharged. The amount of gas is kept almost constant.

With the above configuration, a certain amount of gas can be stored in the buffer chamber 7a without providing a control mechanism, and discharge stability due to the damper effect can be obtained. Further, since a means such as a sensor for keeping the amount of gas constant is not required, it is possible to realize miniaturization and cost reduction.

Next, an example of the device for discharging the liquid according to the present invention will be described with reference to FIG. FIG. 5 is an explanatory side view of a main part of the device.
The device for discharging the liquid of the present embodiment includes the above-mentioned liquid discharge head according to the present invention.

The device that discharges the liquid shown in FIG. 5 is an example of a serial type device, and the carriage 403 reciprocates in the main scanning direction by the main scanning moving mechanism.
The carriage 403 is equipped with a liquid discharge unit 440 in which the liquid discharge head 404 and the head tank 441 according to the present invention are integrated. The liquid discharge head 404 of the liquid discharge unit 440 discharges liquids of, for example, yellow (Y), cyan (C), magenta (M), and black (K). Further, the liquid discharge head 404 is mounted by arranging a nozzle array composed of a plurality of nozzles in the sub-scanning direction orthogonal to the main scanning direction and directing the discharge direction downward.

The transport belt 412 attracts the paper and transports the paper at a position facing the liquid discharge head 404. The transport belt 412 is an endless belt, and is hung between the transport roller 413 and the tension roller 414. Adsorption can be performed by electrostatic adsorption, air suction, or the like.
The transfer belt 412 orbits in the sub-scanning direction by rotationally driving the transfer roller 413 via the timing belt and the timing pulley by the sub-scanning motor.
The paper is fed onto the transport belt 412 and sucked, and the paper is transported in the sub-scanning direction by the orbital movement of the transport belt 412.
Therefore, by driving the liquid ejection head 404 in response to the image signal while moving the carriage 403 in the main scanning direction, the liquid is ejected onto the stopped paper to form an image.

Next, an example of the liquid discharge unit according to the present invention will be described with reference to FIG. FIG. 6 is an explanatory plan view of a main part of the unit.
The liquid discharge unit of the present embodiment includes the above-mentioned liquid discharge head according to the present invention.

This liquid discharge unit includes a housing portion composed of side plates 491A, 491B and a back plate 491C, a main scanning moving mechanism 493, a carriage 403, and a liquid discharge among the members constituting the device for discharging the liquid. It is composed of a head 404.

A liquid discharge unit may be configured in which at least one of a maintenance / recovery mechanism and a supply mechanism is further attached to, for example, the side plate 491B of the liquid discharge unit.

Next, another example of the liquid discharge unit according to the present invention will be described with reference to FIG. 7. FIG. 7 is a front explanatory view of the unit.

This liquid discharge unit includes a liquid discharge head 404 to which the flow path component 444 is attached, and a tube 456 connected to the flow path component 444.
The flow path component 444 is arranged inside the cover 442. A head tank 441 may be included instead of the flow path component 444. Further, a connector 443 that electrically connects to the liquid discharge head 404 is provided on the upper part of the flow path component 444.

In the present application, the liquid to be discharged may have a viscosity and surface tension that can be discharged from the head, and is not particularly limited, but the viscosity becomes 30 mPa · s or less at room temperature, under normal pressure, or by heating or cooling. It is preferable that it is a thing. More specifically, solvents such as water and organic solvents, colorants such as dyes and pigments, polymerizable compounds, resins, functionalizing materials such as surfactants, biocompatible materials such as DNA, amino acids and proteins, and calcium. , Solvents, suspensions, emulsions, etc. containing edible materials such as natural pigments, etc., for example, inks for inkjets, surface treatment liquids, components of electronic elements and light emitting elements, and formation of electronic circuit resist patterns. It can be used for applications such as a liquid for use and a material liquid for three-dimensional modeling.

Piezoelectric actuators (laminated piezoelectric elements and thin-film piezoelectric elements), thermal actuators that use electrothermal conversion elements such as heat-generating resistors, and electrostatic actuators that consist of a vibrating plate and counter electrodes are used as energy sources for discharging liquid. Includes what to do.

The "liquid discharge unit" includes a head tank, a carriage, a supply mechanism, a maintenance / recovery mechanism, a main scanning movement mechanism in which at least one of the configurations is combined with a liquid discharge head, and the like.

Here, "integration" means, for example, a liquid discharge head and a functional component, a mechanism in which the mechanism is fixed to each other by fastening, adhesion, engagement, etc., or one in which one is movably held with respect to the other. include. Further, the liquid discharge head, the functional parts, and the mechanism may be detachably attached to each other.

For example, as a liquid discharge unit, there is one in which a liquid discharge head and a head tank are integrated. Further, there is a case in which the liquid discharge head and the head tank are integrated by being connected to each other by a tube or the like. Here, a unit including a filter can be added between the head tank of these liquid discharge units and the liquid discharge head.

Further, as a liquid discharge unit, there is a liquid discharge head and a carriage integrated.

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

Further, as a liquid discharge unit, there is a carriage to which a liquid discharge head is attached, in which a cap member which is a part of the maintenance / recovery mechanism is fixed, 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 unit in which a tube is connected to a head tank or a liquid discharge head to which a flow path component is attached, and the liquid discharge head and a supply mechanism are integrated. Through this tube, the liquid of the liquid storage source is supplied to the liquid discharge head.

The main scanning movement mechanism shall also include a single guide member. In addition, the supply mechanism shall include a single tube and a single loading unit.

The "device for discharging a liquid" includes a device provided with a liquid discharge head or a liquid discharge unit and driving the liquid discharge head to discharge the liquid. The device for discharging the liquid includes not only a device capable of discharging the liquid to a device to which the liquid can adhere, but also a device for discharging the liquid toward the air or the liquid.

The "device for discharging the liquid" can also include means for feeding, transporting, and discharging paper to which the liquid can adhere, as well as a pretreatment device, a posttreatment device, and the like.

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

Further, the "device for discharging a liquid" is not limited to a device in which a significant image such as characters and figures is visualized by the discharged liquid. For example, those that form patterns that have no meaning in themselves and those that form a three-dimensional image are also included.

The above-mentioned "material to which a liquid can adhere" means a material to which a liquid can adhere at least temporarily, such as one that adheres and adheres, and one that adheres and permeates. Specific examples include paper, recording paper, recording paper, film, recording media such as cloth, electronic substrates, electronic components such as piezoelectric elements, powder layers (powder layers), organ models, and media such as inspection cells. Yes, including anything to which the liquid adheres, unless otherwise specified.

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

Further, the "device for discharging the liquid" includes, but is not limited to, a device in which the liquid discharge head and the device to which the liquid can adhere move relatively. Specific examples include a serial type device that moves the liquid discharge head, a line type device that does not move the liquid discharge head, and the like.

In addition, as a "device for ejecting a liquid", a treatment liquid coating device for ejecting a treatment liquid to a paper in order to apply the treatment liquid to the surface of the paper for the purpose of modifying the surface of the paper, etc. There is an injection granulation device that granulates fine particles of the raw material by injecting a composition liquid in which the raw material is dispersed in a solution through a nozzle.

In addition, image formation, recording, printing, printing, printing, modeling, etc. in the terms of the present application are all synonymous.

1 Frame member 1a Ink supply port 1b Common supply liquid chamber 1c Ink discharge port 1d Common circulation liquid chamber 2 Flow path plate member 2A Circulation flow path plate 2B Communication flow path plate 2C Supply flow path plate 2a Fluid resistance part 2b Individual liquid chamber ( Pressure generation chamber)
2c Communication port 2d Supply flow path 2e Circulation flow path 3 Nozzle plate 4 Base 5 Laminated piezoelectric element 6 Diaphragm 6a Convex part 6b Diaphragm part 6c Internal filter 7a Buffer chamber 7b Gas permeable membrane 7c Buffer flow path 8 FPC

Japanese Patent No. 5475389

Claims (7)

A nozzle plate on which multiple nozzles for ejecting droplets are formed,
A plurality of individual liquid chambers communicating with the plurality of nozzles, a supply flow path for supplying liquid to the individual liquid chambers, and a circulation flow path communicating with the individual liquid chambers and collecting a part of the liquid in the individual liquid chambers. And the flow path plate member that forms
At least a common supply liquid chamber for supplying liquid to the supply flow path, a common circulating liquid chamber for accommodating liquid from the circulation flow path, and a frame member having a buffer chamber having a space capable of storing gas. Prepare
The buffer chamber is characterized by including a gas permeable membrane that communicates with the circulation flow path via a buffer flow path formed in the flow path plate member and / or the frame member and allows only gas to permeate inside. Liquid discharge head. The liquid discharge head according to claim 1, wherein the buffer chamber communicates with the atmosphere. In the frame member, a common supply liquid chamber, a common circulating liquid chamber, and a buffer chamber are formed in this order from the nozzle side in the longitudinal direction of the circulation flow path.
The buffer flow path is formed in the flow path plate member and the frame member, and is formed on the flow path plate member and the frame member.
The liquid discharge head according to claim 1 or 2, wherein one end of the buffer flow path opens to a side end surface of the circulation flow path. In the frame member, a common supply liquid chamber, a buffer chamber, and a common circulating liquid chamber are formed in this order from the nozzle side in the longitudinal direction of the circulation flow path.
The buffer flow path is formed in the flow path plate member and the frame member, and is formed on the flow path plate member and the frame member.
The liquid discharge head according to claim 1 or 2, wherein one end of the buffer flow path opens on the circulation flow path. In the frame member, a common supply liquid chamber, a common circulating liquid chamber, and a buffer chamber are formed in this order from the nozzle side in the longitudinal direction of the circulation flow path.
The buffer flow path is formed in the frame member and is formed.
The liquid discharge head according to claim 1 or 2, wherein one end of the buffer flow path opens to a side end surface of the common circulating liquid chamber. A liquid discharge unit comprising the liquid discharge head according to any one of claims 1 to 5. A device for discharging a liquid, which comprises the liquid discharge head according to any one of claims 1 to 5.

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