JP2020032635A - Defoaming unit, liquid ejection head and liquid ejection device - Google Patents

Abstract

To prevent a liquid circulating in one of two liquid channels of a defoaming unit from leaking into the other liquid channel.SOLUTION: A defoaming unit that removes air bubbles in a liquid flowing through a liquid channel comprises: a liquid channel member having a first opening and a second opening; a gas channel member having a third opening; and an elastic member through which gas can pass, the elastic member blocking the first opening, the second opening, and the third opening. The elastic member has: a first permeable portion through which gas in a first liquid channel is passed into a gas channel; a second permeable portion through which gas in a second liquid channel is passed into the gas channel; and a region sandwiched by the liquid channel member and the gas channel member between the first permeable portion and the second permeable portion.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a defoaming unit, a liquid discharge head, and a liquid discharge device.

  Conventionally, two liquid supply paths, which are liquid flow paths through which liquid flows, a decompression chamber connected to the two liquid supply paths in a state in which gas can flow, and a liquid supply path and a pressure reduction chamber There is known a liquid supply device having a partition arranged in a liquid crystal panel (for example, Patent Document 1). In this liquid supply device, the two liquid supply passages and the decompression chamber are partitioned by one partition. The partition wall is configured to allow the gas to permeate from the liquid supply path to the decompression chamber and reduce the permeation of the liquid from the liquid supply path to the decompression chamber by decompression of the decompression chamber. The partition wall is arranged so as to be in contact with a wall separating the two liquid supply passages, and is partitioned so as not to communicate with the two liquid supply passages.

JP 2010-76412 A

  In the related art, when the negative pressure in the decompression chamber is increased, when the area of the partition is increased, or when an elastic member is employed as a member of the partition, the present inventors have accompanied the decompression of the decompression chamber. It has been found that the partition walls may be deformed. When the partition wall is deformed, a gap may be generated between the partition wall and the wall separating the two liquid supply paths with the deformation of the partition wall. If a gap occurs, leakage of liquid between the two liquid supply paths may occur.

  According to one embodiment of the present disclosure, there is provided a defoaming unit that removes bubbles in a liquid flowing through a liquid channel. The defoaming unit is a first wall defining a first liquid flow path and a second liquid flow path, and a first opening communicating with the first liquid flow path. A liquid flow path member having a first wall formed with a second opening communicating with the second liquid flow path, and a second gas flow path for flowing a gas. A gas channel member having a wall portion, a second wall portion formed with a third opening communicating with the gas channel, and an elastic member permeable to gas, An elastic member for closing the first opening, the second opening, and the third opening between the liquid flow path member and the gas flow path member; And the gas flow path member, wherein the third opening faces at least a part of the first opening and at least a part of the second opening. And the elastic member is located between the first opening and the third opening to partition the first liquid flow path and the gas flow path, A first permeable portion for allowing gas in the liquid flow path to pass through the gas flow path, and the second liquid flow path located between the second opening and the third opening; And a second flow path for dividing the gas in the second liquid flow path into the second flow path for the gas, the second flow path, and the second flow path. And a region sandwiched between the liquid flow path member and the gas flow path member between the transmission part.

FIG. 2 is a schematic diagram illustrating an internal configuration of a liquid ejection device. FIG. 2 is a schematic diagram illustrating a configuration of a head unit according to the first embodiment. FIG. 3 is a schematic sectional view showing a 3-3 section in FIG. 2. Sectional drawing in the 4-4 section shown in FIG. FIG. 3 is a schematic diagram showing a state of a head unit when the pressure in the gas flow path is reduced. FIG. 7 is a schematic diagram of a head unit according to a comparative example. The schematic diagram for demonstrating the structure of the defoaming unit which concerns on 2nd Embodiment. FIG. 7 is a schematic diagram illustrating a structure of a head unit according to a first different embodiment.

A. First embodiment A1. Configuration of Liquid Discharge Apparatus FIG. 1 is a schematic diagram illustrating an internal configuration of the liquid discharge apparatus 1. The liquid ejection device 1 is a so-called inkjet printer, and performs printing on the medium 20 by ejecting ink as a liquid onto the medium 20. The medium 20 is a printing medium such as a sheet, a board, or a cloth. As the ink, for example, an aqueous ink or a solvent ink can be used. In the present embodiment, an aqueous ink is used as the ink. FIG. 1 illustrates three spatial axes orthogonal to each other, that is, an X axis, a Y axis, and a Z axis. The direction along the X axis is defined as the X axis direction, the direction along the Y axis is defined as the Y axis direction, and the direction along the Z axis is defined as the Z axis direction. The liquid ejection device 1 is installed on a plane parallel to an XY plane defined by the X-axis direction and the Y-axis direction. The -Z-axis direction is a vertically downward direction, and the + Z-axis direction is a vertically upward direction. In other drawings described below, the Z axis is attached as necessary.

  The liquid ejection device 1 includes a transport mechanism 15 for transporting the medium 20, a control unit 17, a carriage 19, and a liquid supply source 30 detachably mounted on the carriage 19 inside the outer shell 10. The transport mechanism 15 has a motor M as a power source. The carriage 19 includes the head unit 12 that functions as a liquid discharge head that discharges liquid to the outside. The control unit 17 controls various operations of the liquid ejection device 1, for example, a printing operation. In the present embodiment, the liquid supply source 30 is a liquid tank capable of storing a liquid therein.

  The carriage 19 has a head unit 12 and a mounting unit 11 arranged on the head unit 12. The mounting portion 11 has, for example, a concave shape that opens in the + Z-axis direction, and forms a mounting space in which the liquid supply source 30 is mounted. The mounting portion 11 has a liquid introduction needle portion 112 protruding from the lower surface defining the mounting space in the + Z-axis direction. The liquid introduction needle 112 is connected to the liquid supply source 30. The liquid introduction needle portion 112 is hollow, and a communication hole communicating with the inside is formed at the distal end side. The liquid supplied from the liquid supply source 30 flows through the inside of the liquid introduction needle 112 through the communication hole of the liquid introduction needle 112. The head unit 12 communicates with the liquid introduction needle portion 112 and discharges the liquid supplied from the liquid supply source 30 to the medium 20.

A2. Configuration of Liquid Discharge Head Unit FIG. 2 is a schematic diagram illustrating a configuration of the head unit 12 according to the first embodiment. The head unit 12 includes the defoaming unit 100 and four heads 170. In the present embodiment, the defoaming unit 100 and the head 170 are integrated. In a normal use state, the upper side of FIG. 2 is the + Z axis direction side, and the lower side of the paper plane is the −Z axis direction side.

  The defoaming unit 100 performs defoaming processing for removing bubbles contained in the liquid, and supplies the liquid after the defoaming processing to the head 170. The defoaming unit 100 is provided with a pressure adjusting mechanism 192 used in the defoaming process. The defoaming unit 100 includes a liquid flow path member 120, a gas flow path member 140, and an elastic member 160. In the present embodiment, the defoaming unit 100 has a structure in which the liquid flow path member 120, the elastic member 160, and the gas flow path member 140 are stacked in this order from the −Z axis direction to the + Z axis direction. . Hereinafter, the direction in which the liquid flow path member 120, the elastic member 160, and the gas flow path member 140 are stacked is referred to as a stacking direction.

  The liquid flow path member 120 has a first wall 130. The first wall section 130 partitions the internal space of the liquid flow path member 120 and defines a first liquid flow path 1222 and a second liquid flow path 1224. The gas flow path member 140 has a second wall 150. The second wall section 150 defines an internal space of the gas flow path member 140 and defines a gas flow path 142.

  In the gas flow path member 140, a part of the first liquid flow path 1222 and the second liquid flow path 1224 may be formed. In the present embodiment, the liquid flow path member 120 and the gas flow path member 140 are formed of a synthetic resin such as polypropylene.

  The elastic member 160 is a single plate-like member formed of rubber having gas permeability. The liquid flow path member 120 and the gas flow path member 140 are joined to each other using screws or rivets. The elastic member 160 is fixed between the liquid channel member 120 and the gas channel member 140 by the pressure applied from the liquid channel member 120 and the gas channel member 140. That is, the elastic member 160 is sandwiched between the liquid flow path member 120 and the gas flow path member 140. The elastic member 160 may be bonded to the liquid flow path member 120 and the gas flow path member 140.

  The head 170 discharges the liquid supplied from the defoaming unit 100 to the medium 20 (FIG. 1). The head 170 includes a main body 171 having an internal space (not shown) for accommodating a liquid, a nozzle 172 as an opening for discharging the liquid supplied from the defoaming unit 100 to the outside, and an energy generating element 173. And The energy generating element 173 applies power for discharging the liquid flowing in the defoaming unit 100 to the outside. The energy generating element 173 is, for example, a piezo actuator. In the present embodiment, the head 170 employs a piezo method. The piezo-type head 170 discharges liquid from the nozzle 172 by changing the volume in the main body 171 using a piezo actuator.

  The first liquid flow path 1222 and the second liquid flow path 1224 are flow paths formed inside the defoaming unit 100. The liquid supplied from the liquid supply source 30 to the defoaming unit 100 is used as a head. This is a flow channel that circulates up to 170. The first liquid channel 1222 has a first liquid supply channel 1242 and a first liquid storage chamber 1262. Similarly, the second liquid flow path 1224 has a second liquid supply flow path 1244 and a second liquid storage chamber 1264. In the following, when the common configuration and effect of the first liquid channel 1222 and the second liquid channel 1224 are described, the first liquid channel 1222 and the second liquid channel are described. The passage 1224 is also described as a liquid passage 122. Further, the first liquid supply channel 1242 and the second liquid supply channel 1244 are also described as a liquid supply channel 124. Further, the first liquid storage chamber 1262 and the second liquid storage chamber 1264 are also described as a liquid storage chamber 126.

  The liquid supply flow path 124 is a flow path located on the upstream side of the liquid flow path 122, and is a flow path for flowing the liquid supplied from the liquid supply source 30 into the liquid storage chamber 126. In the present embodiment, the liquid supply channel 124 is formed by combining a channel structure 124 a formed in the liquid channel member 120 and a channel structure 124 b formed in the gas channel member 140. I have.

  The liquid storage chamber 126 has an internal space for temporarily storing the liquid flowing into the head 170. In the present embodiment, the internal space of the liquid storage chamber 126 has a truncated cone shape.

  The first wall portion 130 defines a liquid channel 122 in the liquid channel member 120. The first wall portion 130 has, for example, an isolation wall 134 that partitions the first liquid channel 1222 and the second liquid channel 1224. In the first wall 130, a first opening 1382 and a second opening 1384 are formed. The first opening 1382 is formed in the first wall 130 on the top surface side of the liquid storage chamber 126 of the first liquid channel 1222. The first opening 1382 allows the inside and the outside of the liquid storage chamber 126 to communicate with each other. The second opening 1384 is formed in the first wall 130 on the top surface side of the liquid storage chamber 126 of the second liquid flow path 1224. The second opening 1384 allows the inside and the outside of the liquid storage chamber 126 to communicate with each other. The first opening 1382 and the second opening 1384 are closed by the elastic member 160. For this reason, at least a part of the top surface of the liquid storage chamber 126 is defined by the elastic member 160. A communication hole 128 for communicating the liquid storage chamber 126 with the head 170 is formed in a region of the first wall 130 that defines the bottom surface of the liquid storage chamber 126. In the present embodiment, two heads 170 are connected to the first liquid storage chamber 1262 and the second liquid storage chamber 1264, respectively. Therefore, two communication holes 128 are formed, each of the first liquid storage chamber 1262 and the second liquid storage chamber 1264. A filter (not shown) may be disposed in the communication hole 128, and the liquid flowing from the liquid storage chamber 126 to the head 170 may be filtered by the filter (not shown).

  The separating wall 134 is provided at a position between the first liquid channel 1222 and the second liquid channel 1224. The isolation wall 134 is a wall that defines a side surface of the liquid channel 122 extending in the + Z-axis direction from the bottom surface of the liquid channel 122. The distal end surface of the isolation wall 134 is in contact with the elastic member 160.

  The second wall 150 defines a gas flow path 142 in the gas flow path member 140. The second wall 150 has, for example, a first regulating wall 1542 and a second regulating wall 1544. A third opening 158 is formed in the second wall 150. The third opening 158 is formed in the second wall 150 on the bottom side of the gas flow path 142. The third opening 158 allows the inside and the outside of the gas flow path 142 to communicate with each other. The third opening 158 is provided at a position facing at least a part of the first opening 1382 and is provided at a position facing at least a part of the second opening 1384. Therefore, in the present embodiment, the third opening 158 has at least a part of the first opening 1382 and at least one of the second opening 1384 when viewed from the direction along the Z-axis direction. And is formed at a position overlapping the portion. The third opening 158 is closed by the elastic member 160. For this reason, at least a part of the bottom surface of the gas flow path 142 is defined by the elastic member 160.

  A connection port 146 for connecting the gas flow path 142 and the pressure adjusting mechanism 192 is formed in the second wall 150. The connection port 146 is formed in a wall of the second wall 150 that defines a top surface of the gas flow path 142. The pressure adjusting mechanism 192 adjusts the pressure in the gas channel 142. In the present embodiment, the pressure adjusting mechanism 192 is a pump, and reduces the pressure in the gas flow path 142 by sucking the gas in the gas flow path 142. Thereby, for example, the pressure in the gas channel 142 is adjusted to be lower than the pressure in the first liquid channel 1222 and the second liquid channel 1224. The gas sucked by the pressure adjusting mechanism 192 is discharged to the outside. In the present embodiment, only one connection port 146 is provided in the second wall 150. Further, only one pressure adjusting mechanism 192 is connected to the connection port 146.

  The elastic member 160 functions as a seal member between the liquid flow path member 120 and the gas flow path member 140, and suppresses leakage of the liquid flowing in the liquid flow path 122. For example, the joint between the flow path structure 124 a of the liquid flow path member 120 and the flow path structure 124 b of the gas flow path member 140 forming the liquid supply flow path 124 is sealed by the elastic member 160. Further, for example, at the outer edges of the first opening 1382 and the second opening 1384, the joint between the liquid flow path member 120 and the gas flow path member 140 is sealed by the elastic member 160. Since the elastic member 160 has elasticity, the elastic member 160 is deformed by being pressed by the liquid flow path member 120 and the gas flow path member 140, and the gap between the liquid flow path member 120 and the gas flow path member 140 is formed. Seal. For this reason, the elastic member 160 can be easily sealed without performing adhesion or the like.

  Further, the elastic member 160 has a first transmission part 1622 and a second transmission part 1624 functioning as a gas transmission filter. To function as a gas permeable filter means to connect the liquid flow path 122 and the gas flow path 142 in a state where gas can flow and a state where liquid cannot flow. The first transmission portion 1622 is located between the third opening 158 and the first opening 1382 in the stacking direction of the elastic member 160, and the first liquid storage chamber 1262 and the gas flow path 142 Is an area that partitions The second transmission portion 1624 is located between the third opening 158 and the second opening 1384 in the laminating direction of the elastic member 160, and the second liquid storage chamber 1264 and the gas flow path 142 Is an area that partitions When the pressure in the gas flow path 142 is lower than the pressure in the first liquid flow path 1222, the first transmission section 1622 causes the first liquid flow path 1222, specifically the first The gas in the liquid storage chamber 1262 is transmitted to the gas channel 142. When the pressure in the gas flow path 142 is lower than the pressure in the second liquid flow path 1224, the second transmission section 1624 forms the second liquid flow path 1224, specifically, the second The gas in the liquid storage chamber 1264 is transmitted to the gas channel 142. In the following, when the common configuration and effect of the first transmitting unit 1622 and the second transmitting unit 1624 are described, the first transmitting unit 1622 and the second transmitting unit 1624 are also described as the transmitting unit 162. Is done.

The elastic member 160 has gas permeability equal to or higher than a predetermined reference value in order to smoothly move the gas between the liquid channel 122 and the gas channel 142. In the present embodiment, the gas permeability is evaluated using the oxygen permeability of a test piece having a thickness of 50 μm in an environment at a temperature of 25 degrees Celsius. In the present embodiment, the predetermined reference value is an oxygen permeability of 100,000 (cc · m / (m ² day · atm)) or more. In addition, the oxygen permeability of the elastic member 160 is preferably not less than 200000 (cc · m / (m ² day · atm)), and not less than 500000 (cc · m / (m ² day · atm)). Is more preferred. In the present embodiment, the elastic member 160 is formed of silicone rubber, and has an oxygen permeability of 700,000 (cc · m / (m ² day · atm)) or more.

  FIG. 3 is a schematic cross-sectional view showing a 3-3 cross section in FIG. As shown in FIGS. 2 and 3, the second wall 150 includes a first regulating wall 1542 formed around the first opening 1382 and a second regulating wall 1542 around the second opening 1384. And a second regulating wall 1544 formed along. The first regulating wall 1542 and the second regulating wall 1544 press the elastic member 160 by at least a part of the tip on the −Z axis direction side. A gas flow portion 144 is formed in the first restriction wall 1542 and the second restriction wall 1544. The gas flow section 144 has an opening for flowing gas between the inside and the outside of the space surrounded by the first and second control walls 1542 and 1544. For this reason, in the gas flow path 142, the gas can be circulated between the first transmitting portion 1622 and the second transmitting portion 1624. In the following, when the common configuration and effect of the first regulation wall 1542 and the second regulation wall 1544 are described, the first regulation wall 1542 and the second regulation wall 1544 are also described as the regulation wall 154. Is done.

  As shown in FIG. 2, in the present embodiment, a first wall portion 130 is provided on the opposite side of the elastic member 160 from the regulation wall 154 side. The first wall portion 130 includes a partition wall 134 as a part thereof, and further includes a wall that is a part of the first wall portion 130 and defines a side surface of the liquid storage chamber 126. For this reason, around the first opening 1382 and the second opening 1384, the elastic member 160 is sandwiched between the regulating wall 154 and a part of the first wall 130 including the separating wall 134. It has a region 168. In the present embodiment, having the sandwiched region 168 means a state in which the elastic member 160 is in contact with both the regulating wall 154 and a part of the first wall portion 130 and is sandwiched. Accordingly, the movement of the elastic member 160 at least around the first opening 1382 and the second opening 1384 is suppressed.

  FIG. 4 is a cross-sectional view taken along the line 4-4 shown in FIG. As shown in FIG. 4, a concave portion 156 is formed in the first restriction wall 1542 and the second restriction wall 1544. The concave portion 156 has a shape in which a part of a wall is chipped at a distal end portion, and forms a gap that functions as a gas flow portion 144 between the concave portion 156 and the elastic member 160. The recess 156 has a shape in which the height h1 is larger than the width w1. The width w1 means the size of the recess 156 in the width direction. In the present embodiment, the width direction refers to a direction along the wall surface of the regulating wall 154 in which the concave portion 156 is formed, of the in-plane direction that is a direction along the surface of the elastic member 160 in the present embodiment. The height h1 means the size of the recess 156 in the height direction. In the present embodiment, the height direction is a direction orthogonal to the surface of the elastic member 160, that is, the Z-axis direction. Since the width w1 of the recess 156 is larger than the height h1, a decrease in the surface area of the elastic member 160 pressed by the first regulating wall 1542 due to the formation of the recess 156 is suppressed. Note that the second restriction wall 1544 has a structure similar to that of the first restriction wall 1542.

  FIG. 5 is a schematic diagram showing a state of the head unit 12 when the pressure in the gas flow path 142 is reduced. In FIG. 5, the flow direction of the liquid is indicated by an arrow d1 drawn by a solid line. The gas flow direction is indicated by an arrow d2 drawn by a broken line.

  The liquid flows into the liquid supply channel 124 by being supplied from the liquid supply source 30. The liquid that has flowed into the liquid supply channel 124 flows downstream of the liquid supply channel 124 and flows into the liquid storage chamber 126. The liquid that has flowed into the liquid storage chamber 126 temporarily stays in the liquid storage chamber 126 and then flows into the head 170.

  Part of the gas contained in the liquid flows into the liquid storage chamber 126 as bubbles. Bubbles flowing into the liquid storage chamber 126 move vertically upward (+ Z axis direction) by buoyancy. The bubbles break and disappear after reaching the liquid level. The gas flowing into the liquid storage chamber 126 together with the liquid is collected on the top surface of the liquid storage chamber 126, that is, on the side of the transmission section 162 in this embodiment. The gas in the liquid storage chamber 126 moves to the gas flow path 142 via the transmission part 162.

  In the present embodiment, the pressure in the gas passage 142 is adjusted by the pressure adjusting mechanism 192 so as to be lower than the pressure in the liquid storage chamber 126. As a result, the movement of the gas in the liquid storage chamber 126 toward the gas flow path 142 can be promoted. Thereby, the gas in the liquid storage chamber 126 is efficiently discharged, and the bubbles in the liquid storage chamber 126 are removed. Therefore, the flow of bubbles from the liquid flow path 122 into the head 170 due to the flow of the liquid is suppressed, and the occurrence of defects such as defective ejection of liquid due to the bubbles flowing into the head 170 is suppressed. .

  The generation of bubbles can be caused by the following factors, for example. For example, bubbles dissolved in the liquid are precipitated due to a rise in the temperature of the head unit 12 or a change in the environmental temperature, thereby generating bubbles. Further, for example, gas is mixed into the liquid flow channel 122 due to attachment / detachment of the liquid supply source 30, generation of cavitation bubbles due to ultrasonic waves generated from the piezo actuator, and waving of the liquid surface accompanying movement of the carriage 19 (FIG. 1). In some cases, bubbles may be generated.

  The defoaming unit 100 may always perform the suction of the gas by the pressure adjusting mechanism 192, or may perform the suction intermittently. In the present embodiment, the defoaming unit 100 constantly performs the suction of the gas by the pressure adjusting mechanism 192 during the time when the power is turned off after the power of the liquid discharging apparatus 1 (FIG. 1) is turned on. Thereby, the inflow of bubbles into the head 170 can be further suppressed as compared with the case where the suction of gas is performed intermittently.

  As shown in FIG. 5, when the pressure in the gas flow path 142 is reduced, the elastic member 160 bends due to the pressure difference between the gas flow path 142 and the liquid flow path 122. The bending of the elastic member 160 occurs in the transmission part 162 through which gas flows. The defoaming unit 100 has a structure in which a portion 168 of the elastic member 160 is sandwiched between the gas flow path member 140 and the liquid flow path member 120 around the transmission section 162. Therefore, even when the elastic member 160 is bent, the deformation of the elastic member 160 in the transmission portion 162 located between the gas flow path member 140 and the liquid flow path member 120 is suppressed. In the present embodiment, the deformation of the elastic member 160 in the transmission section 162 means a deformation in a direction connecting the gas flow path member 140 and the liquid flow path member 120. In the present embodiment, the direction connecting the gas flow path member 140 and the liquid flow path member 120 substantially coincides with the Z-axis direction.

A3. FIG. 6 is a schematic diagram of a head unit 412 according to a comparative example. The head unit 412 according to the comparative example differs from the head unit 412 of the first embodiment in the structure of the defoaming unit 300. Specifically, the gas flow path member 340 provided in the defoaming unit 300 in the comparative example has a structure corresponding to the regulating wall 154 of the gas flow path member 140 (FIG. 2) in the first embodiment. I haven't. For this reason, in the head unit 412 according to the comparative example, the elastic member 160 is not fixed around the transmission part 162. In the following, the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

  As shown in FIG. 6, when the pressure in the gas flow path 342 is reduced by the head unit 412 according to the comparative example, the pressure difference between the gas flow path 342 side and the liquid flow path 122 side causes the elasticity. The member 160 is bent. The defoaming unit 300 in the comparative example does not have a structure in which the elastic member 160 is sandwiched between the gas flow path member 340 and the liquid flow path member 120 around the transmission section 162. Therefore, when the elastic member 160 is bent, the elastic member 160 is deformed in the transmission part 162 located between the gas flow path member 340 and the liquid flow path member 120. As shown in FIG. 6, in the head unit 412 according to the comparative example, a gap is formed above the isolation wall 134 that separates the first liquid channel 1222 and the second liquid channel 1224 due to the bending of the elastic member 160. Can occur. Thereby, even when the pressure in the gas flow path 342 is reduced, the seal by the elastic member 160 may not be maintained. If the seal by the elastic member 160 is not maintained, leakage of liquid may occur between the first liquid channel 1222 and the second liquid channel 1224.

  According to the defoaming unit 100 according to the first embodiment described above, the elastic member 160 allows the liquid flow path member 120 and the gas flow between the first permeable portion 1622 and the second permeable portion 1624. It has an area sandwiched by the road member 140. Therefore, even if the pressure in the gas flow path 142 is lower than the pressures in the first liquid flow path 1222 and the second liquid flow path 1224, the first liquid flow path 1222 The deformation of the elastic member 160 between itself and the second liquid flow path 1224 is suppressed. Thereby, even when the pressure in the gas flow path 142 is reduced, the seal by the elastic member 160 is maintained. Therefore, due to the deformation of the elastic member 160, the liquid flowing in one liquid flow path between the first liquid flow path 1222 and the second liquid flow path 1224 is used for the other liquid flow path. The formation of a leakable gap on the flow path side can be suppressed.

  Further, according to the defoaming unit 100 according to the first embodiment described above, the pressure in the gas flow path 142 is controlled by one pressure adjusting mechanism attached to the connection port 146 provided in the second wall 150. 192. Therefore, a defoaming process for defoaming bubbles contained in the plurality of liquid flow path members 120 is performed using one pressure adjusting mechanism 192. Thus, it is not necessary to provide the pressure adjusting mechanism 192 for each liquid flow path requiring defoaming. Therefore, as compared with the case where the pressure adjusting mechanism 192 is provided for each liquid flow path, it is possible to reduce the space and cost of the defoaming unit 100. Further, since there is no need to receive a plurality of connection ports 146, the labor in the manufacturing process is reduced.

  Further, according to the defoaming unit 100 according to the first embodiment described above, the first opening 1382, the second opening 1384, and the third opening 158 are closed by one elastic member 160. ing. Therefore, the manufacturing cost is reduced as compared with the case where the plurality of elastic members 160 are used to close the first opening 1382, the second opening 1384, and the third opening 158.

B. Second Embodiment FIG. 7 is a schematic diagram for explaining a structure of a defoaming unit 200 according to a second embodiment. FIG. 7 shows a cross section of the defoaming unit 200 corresponding to the cross section shown in FIG. In the following, the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description will be omitted.

  As shown in FIG. 7, in the defoaming unit 200 according to the second embodiment, the structure of the gas flow path member 240, specifically, the shape of the concave portion 256 formed in the gas flow path member 240 is the first. This is different from the defoaming unit 100 according to the embodiment. The defoaming unit 200 according to the second embodiment is different from the defoaming unit 100 according to the first embodiment in the shape of the elastic member 260.

  The recess 256 has tapered surfaces 257 facing each other. The distance between the tapered surfaces 257 gradually increases toward the side where the elastic member 260 is disposed. In the present embodiment, the direction toward the side on which the elastic member 260 is arranged substantially coincides with the −Z-axis direction. In the case where the tapered surface 257 is provided, the width w2 of the concave portion 256 is the largest value among the distances of the tapered surfaces 257 facing each other on a plane perpendicular to the Z axis. In the present embodiment, it is the distance between the tapered surfaces 257 at the lower end of the concave portion 256.

  The elastic member 260 has a protrusion 267 protruding toward the liquid flow path member 120 on the surface on the side where the gas flow path member 240 is disposed. The protrusion 267 is provided so as to be located in a space defined by the tapered surface 257 of the concave portion 256. To be located in the space defined by the tapered surface 257 means a state where the concave portion 256 and at least a part of the protrusion 267 overlap when viewed from the + Z-axis direction side. It is preferable that the protrusion 267 and the tapered surface 257 are in contact with each other. In the present embodiment, the tapered surface 257 is in contact with the projection 267. Further, in the present embodiment, the protrusion 267 is fitted in the recess 256 while being pressed by the tapered surface 257.

  According to the second embodiment described above, a similar effect is obtained in that the second embodiment has the same configuration as the first embodiment. Further, according to the defoaming unit 200 according to the second embodiment, the concave portion 256 has the tapered surface 257, and the elastic member 260 has the projection 267 provided so as to be located in the space defined by the tapered surface 257. Have. For this reason, even when the elastic member 260 is deformed by the decompression process, the deformation is suppressed by the protrusion 267 being in contact with the tapered surface 257. Further, in the present embodiment, the protrusion 267 is fitted in the recess 256 while being pressed by the tapered surface 257. Thus, the elastic member 260 is pressed from the tapered surface 257 in addition to the portion of the regulating wall 154 where the concave portion 256 is not provided. Thereby, the elastic member 260 has a large area pressed by the regulating wall 154, so that deformation is suppressed. Therefore, the liquid flowing in one liquid flow path between the first liquid flow path 1222 and the second liquid flow path 1224 can leak to the other liquid flow path side by the deformation of the elastic member 260. It is possible to more efficiently suppress the formation of a simple gap.

C. Other Embodiment C1. First Other Embodiment In the above embodiment, the flow path structure formed in the defoaming units 100 and 200 can be appropriately changed as long as it has a plurality of liquid flow paths 122. For example, in the above embodiment, two liquid channels 1222 and 1224 are formed as the plurality of liquid channels 122, but the present invention is not limited to this. For example, three or more liquid channels may be formed in the defoaming units 100 and 200. In this case, the first liquid channel 1222 may be any one of three or more liquid channels provided in the defoaming units 100 and 200. The second liquid flow path 1224 is provided at a position adjacent to the first liquid flow path 1222 when viewed from a direction in which a plurality of liquid flow paths are arranged among three or more liquid flow paths. The flow path for liquid may be provided. When three or more liquid channels are formed in the defoaming units 100 and 200, each liquid channel may be provided with an opening for performing a defoaming process.

  Further, in the above embodiment, the liquid storage chamber 126 is provided, but the invention is not limited to this. For example, the liquid storage chamber 126 may not be provided. That is, a space for temporarily storing the liquid may not be provided in the middle of the liquid channel 122. In this case, the first opening 1382 and the second opening 1384 may be provided in the middle of the liquid supply channel 124.

  FIG. 8 is a schematic diagram illustrating a structure of a head unit 512 according to the first other embodiment. In the above embodiment, the positional relationship between the liquid supply channel 124 and the liquid storage chamber 126 in the liquid channel member 120 can be changed. Specifically, for example, as shown in FIG. 8, a first liquid supply channel 1242 and a second liquid supply channel 1244 are provided between the first liquid storage chamber 1262 and the second liquid storage chamber 1264. It may be provided. In this case, the separating wall 134 is provided between the first liquid storage chamber 1262 and the second liquid storage chamber 1264 including a region defining the first liquid supply channel 1242 and the second liquid supply channel 1244. The whole wall.

C2. Second Embodiment In the above embodiment, the elastic members 160 and 260 are provided between the first transmission part 1622 and the second transmission part 1624, and the liquid flow path member 120 and the gas flow path member 140 are provided. , 240, but is not limited thereto. Between the first transmission part 1622 and the second transmission part 1624, the elastic member 160 in a direction connecting the gas flow path 142 with the first liquid flow path 1222 and the second liquid flow path 1224. , 260, the structure of the defoaming units 100 and 200 can be changed as appropriate. For example, of the elastic members 160 and 260, the region pressed by the first wall 130 and the region pressed by the second wall 150 need not overlap.

C3. Third Other Embodiment In the above embodiment, the second wall 150 is formed of a single member, but is not limited to this. For example, the second wall 150 may be composed of a plurality of members. Specifically, a portion of the second wall 150 that functions as the regulation wall 154 may be formed separately from other portions.

C4. Fourth Other Embodiment In the above embodiment, the gas flow path members 140 and 240 are depressurized by one pressure adjusting mechanism 192, but the number of the pressure adjusting mechanisms 192 is not limited to this. For example, two or more pressure adjusting mechanisms 192 may be provided. In this case, the connection ports 146 may be provided on the first transmission section 1622 side and the second transmission section 1624, respectively. When the connection ports 146 are provided on the first transmission section 1622 side and the second transmission section 1624, respectively, the gas flow path members 140 and 240 are connected to the first transmission section 1622 side and the second transmission section 1624. It is not necessary to have a structure in which the transmission portion 1624 communicates with the transmission portion 1624.

C5. Fifth Other Embodiment In the above-described embodiment, the defoaming units 100 and 300 are configured so that the gas in the gas flow path 142 is discharged from the connection port 146, so that the pressure in the first liquid flow path 1222 is reduced. The gas flow path 142 has a pressure lower than the pressure in the second liquid flow path 1224. However, in the defoaming units 100 and 300, the gas flow path 142 may have a pressure smaller than the pressure in the first liquid flow path 1222 and the pressure in the second liquid flow path 1224 by another method. May be configured. For example, by increasing the pressure in the liquid channel 122, the pressure in the first liquid channel 1222 and the pressure in the second liquid channel 1224 are reduced to the pressure in the gas channel member 140. It may be larger. In this case, the defoaming unit 100 may include a pump capable of pumping the liquid in the liquid channel 122.

C6. Sixth Other Embodiment In the above embodiment, the elastic members 160 and 260 have, in addition to gas permeability, a sealing property for suppressing leakage of liquid around the liquid flow path 122. However, the elastic members 160 and 260 do not need to have a sealing property. In this case, leakage of the liquid around the liquid channel 122 may be suppressed by another seal member.

C7. Seventh Other Embodiment In the above embodiment, the gas flow portion 144 is formed by a gap formed between the elastic members 160 and 260 and the concave portions 156 and 256 having widths w1 and w2 larger than the height h1. However, the structure of the gas circulation unit 144 is not limited to this. For example, the gas flow portion 144 may be formed by a gap formed between the elastic members 160 and 260 and the concave portions 156 and 256 having a shape having a width larger than the height. Further, the gap is formed between the concave portions 156 and 256 and the elastic members 160 and 260, but is not limited thereto. For example, a through hole provided in the regulating wall 154 may be used.

C8. Eighth Other Embodiment In the above embodiment, different liquid supply sources 30 are connected to the first liquid channel 1222 and the second liquid channel 1224, respectively. However, a common liquid supply source 30 may be connected to the first liquid channel 1222 and the second liquid channel 1224.

C9. Ninth Other Embodiment In the above embodiment, the first wall portion 130 and the second wall portion 150 may have hollow walls. In this case, the weight of the defoaming units 100 and 200 can be reduced.

C10. Tenth Other Embodiment In the above embodiment, the head 170 employs the piezo method. However, the head 170 is not limited to this. For example, a thermal head may be employed instead of the piezo head 170. In this case, the energy generating element 173 is a heating element that heats the liquid in the head.

C11. Eleventh Other Embodiment In the above embodiment, two heads 170 are connected to one liquid storage chamber 126, but the present invention is not limited to this. For example, one head 170 may be connected to one liquid storage chamber 126. Further, for example, three or more heads 170 may be attached to one liquid storage chamber 126.

C. 12. Twelfth Other Embodiment In the above embodiment, the sealing property between the liquid channel member 120 and the gas channel member 140 is pressed by the liquid channel member 120 and the gas channel member 140. It is secured by the elastic member 160. However, the method for ensuring the sealing property between the liquid flow path member 120 and the gas flow path member 140 is not limited to this. For example, the joint between the flow path structure 124a of the liquid flow path member 120 and the flow path structure 124b of the gas flow path member 140 forming the liquid supply flow path 124 is not an elastic member 160 but an adhesive or the like. May be sealed. Further, for example, an adhesive or the like may be used in addition to the elastic member 160. In this case, the degree of deformation of the elastic member 160 due to pressing may be smaller than in the case of the above embodiment.

  The first to twelfth other embodiments described above have the same effect in that they have the same configuration as the above embodiment.

C13. Thirteenth Other Embodiment The present disclosure is not limited to a liquid ejection device that ejects ink, and can be applied to any liquid ejection device that ejects liquid other than ink. For example, the present disclosure is applicable to the following various types of liquid ejection devices.
(1) An image recording device such as a facsimile device.
(2) A color material discharge device used for manufacturing a color filter for an image display device such as a liquid crystal display.
(3) An electrode material discharge device used for forming electrodes of an organic EL (Electro Luminescence) display, a surface emitting display (Field Emission Display, FED) and the like.
(4) A liquid ejecting apparatus for ejecting a liquid containing a biological organic substance used for manufacturing a biochip.
(5) A sample ejection device as a precision pipette.
(6) Lubricating oil discharge device.
(7) A resin liquid discharging device.
(8) A liquid discharge device that discharges lubricating oil to a precision machine such as a clock or a camera in a pinpoint manner.
(9) A liquid discharging apparatus that discharges a transparent resin liquid such as an ultraviolet curable resin liquid onto a substrate to form a micro hemispherical lens (optical lens) used for an optical communication element or the like.
(10) A liquid discharge device that discharges an acidic or alkaline etchant for etching a substrate or the like.
(11) A liquid ejecting apparatus including a liquid ejecting head for ejecting any other small amount of liquid droplets.

  The term “droplets” refers to the state of the liquid discharged from the liquid discharge device, and includes those that leave a tail in a granular shape, a tear shape, or a thread shape. The “liquid” here may be any material that can be consumed by the liquid ejection device. For example, "liquid" may be a material in a state when the substance is in a liquid phase, a material in a high or low viscosity liquid state, and sol, gel water, other inorganic solvents, organic solvents, solutions, A liquid material such as a liquid resin and a liquid metal (metal melt) is also included in the “liquid”. In addition, not only a liquid as one state of a substance but also a liquid in which particles of a functional material formed of a solid such as a pigment or metal particles are dissolved, dispersed, or mixed in a solvent is also included in the “liquid”. Representative examples of the liquid include ink and liquid crystal. Here, the inks include general water-based inks and oil-based inks, and various liquid compositions such as gel inks and hot melt inks.

  The present disclosure is not limited to the above-described embodiments, and can be implemented with various configurations without departing from the spirit thereof. For example, the technical features in the embodiments corresponding to the technical features in each embodiment described in the summary of the invention may be used to solve some or all of the above-described problems, or to provide one of the above-described effects. In order to achieve a part or all, replacement or combination can be appropriately performed. If the technical features are not described as essential in this specification, they can be deleted as appropriate.

(1) According to one embodiment of the present disclosure, a defoaming unit that removes bubbles in a liquid flowing through a liquid channel is provided. The defoaming unit includes a liquid flow path member having a first opening communicating with the first liquid flow path and a second opening communicating with the second liquid flow path, and a gas for flowing gas. A gas flow path member having a third opening communicating with the liquid flow path, and an elastic member permeable to gas, wherein the liquid flow path member and the gas flow path member have the third And an elastic member that closes the first opening, the second opening, and the third opening, wherein the elastic member is located between the first opening and the third opening, A first permeable section that partitions the first liquid flow path and the gas flow path, and that allows the gas in the first liquid flow path to pass through to the gas flow path; Between the first opening and the third opening to partition the second liquid flow path and the gas flow path, and the second liquid flow path A second permeable portion that allows the gas to pass through to the gas flow channel, and the liquid flow channel between the first permeable portion and the second permeable portion in an in-plane direction of the elastic member. And a region sandwiched between the member and the gas flow path member.
According to the defoaming unit of this aspect, the elastic member defines a region between the liquid passage member and the gas passage member between the first transmission portion and the front second transmission portion. Have. For this reason, the deformation of the elastic member is suppressed between the first liquid flow path and the second liquid flow path by the liquid flow path portion and the gas flow path member. Thereby, even when the pressure in the gas flow path is lower than the pressures in the first liquid flow path and the second liquid flow path, the first liquid flow path and the second liquid flow The deformation of the elastic member with respect to the use flow path is suppressed. Therefore, a gap is formed between the first liquid flow path and the second liquid member, through which the liquid flowing in one liquid flow path can leak to the other liquid flow path due to the deformation of the elastic member. Control that.

(2) According to another embodiment of the present disclosure, there is provided a defoaming unit for removing air bubbles in a liquid flowing through a liquid channel. The defoaming unit includes a liquid flow path member having a first opening communicating with the first liquid flow path and a second opening communicating with the second liquid flow path, and a gas for flowing gas. A gas flow path member having a third opening communicating with the liquid flow path, and an elastic member permeable to gas, wherein the liquid flow path member and the gas flow path member have the third And an elastic member that closes the first opening, the second opening, and the third opening, wherein the elastic member is located between the first opening and the third opening, A first permeable section that partitions the first liquid flow path and the gas flow path, and that allows the gas in the first liquid flow path to pass through to the gas flow path; Between the first opening and the third opening to partition the second liquid flow path and the gas flow path, and the second liquid flow path A second permeable portion that allows the gas to pass through to the gas flow channel, and the liquid flow channel between the first permeable portion and the second permeable portion in an in-plane direction of the elastic member. The member and the gas flow path member, a region in which deformation in a direction connecting the gas flow path, the first liquid flow path, and the second liquid flow path is suppressed, Have.
According to the defoaming unit of this aspect, the elastic member is provided between the first permeable portion and the front second permeable portion by the liquid flow path member and the gas flow path member, thereby forming the gas flow path and the second flow path. There is a region where deformation in the direction connecting the first liquid flow path and the second liquid flow path is suppressed. Thereby, even when the pressure in the gas flow path is lower than the pressures in the first liquid flow path and the second liquid flow path, the first liquid flow path and the second liquid flow The deformation of the elastic member with respect to the use flow path is suppressed. Therefore, a gap is formed between the first liquid flow path and the second liquid member, through which the liquid flowing in one liquid flow path can leak to the other liquid flow path due to the deformation of the elastic member. Control that.

(3) In the above aspect, a connection port for connecting the gas flow path and a pump is formed in the gas flow path member, and the gas flow path member is connected to the gas flow path from the connection port. The gas in the flow path may be configured to be exhausted. According to the defoaming unit of this embodiment, it is possible to decompress the gas flow path using the pump.

(4) In the above aspect, the gas flow path member has a wall extending toward the elastic member between the first permeable portion and the second permeable portion, and the elastic member of the wall includes A recess may be formed at the tip on the member side, and the recess may form an opening at a contact surface between the elastic member and the wall. According to the defoaming unit of this aspect, since the opening is formed at the contact surface between the elastic member and the wall, the gas flows between the first permeable portion side and the second permeable portion side in the gas flow path. It will be easier.

(5) In the aspect described above, the recesses have tapered surfaces facing each other, the distance of which gradually increases toward a side on which the elastic member is disposed, and the elastic member includes the tapered surface. It may have a protrusion located in a space defined by the surface. According to the defoaming unit of this mode, the elastic member has the protrusion located in the space defined by the tapered surface. For this reason, the deformation of the elastic member is further suppressed.

(6) In the above aspect, the size in the width direction of the opening formed by the recess may be smaller than the size in the height direction of the opening formed by the recess. According to the defoaming unit of this aspect, it is possible to suppress a decrease in the area of the region pressed by the gas flow path member in the elastic member when forming the concave portion.

(7) In the above aspect, the elastic member may seal a joint between the liquid flow path member and a member other than the liquid flow path member in the liquid flow path. According to the defoaming unit of this mode, the number of members constituting the defoaming unit can be reduced as compared with the case where sealing is performed by a member different from the elastic member.

(8) According to another embodiment of the present disclosure, there is provided a liquid discharge head that discharges liquid to the outside. This liquid discharge head includes the defoaming unit of the above-described embodiment, and an energy generating element that applies power for discharging liquid flowing through the defoaming unit to the outside.
According to the liquid ejection head of this aspect, the defoaming unit of the above aspect is provided. For this reason, in the defoaming unit, even if the pressure in the gas flow path is lower than the pressure in the first liquid flow path and the pressure in the second liquid flow path, the first liquid flow path The deformation of the elastic member between the second liquid flow path and the second liquid flow path is suppressed. Therefore, a gap is formed between the first liquid flow path and the second liquid member, through which the liquid flowing in one liquid flow path can leak to the other liquid flow path due to the deformation of the elastic member. Control that.

(9) According to another aspect of the present disclosure, there is provided a liquid ejection device. The liquid ejection head according to the above aspect includes a transport mechanism that has a motor as a power source and transports a medium that receives liquid ejected from the liquid ejection head.
According to the liquid ejecting apparatus of this mode, the defoaming unit of the above mode is provided. For this reason, in the defoaming unit, even if the pressure in the gas flow path is lower than the pressure in the first liquid flow path and the pressure in the second liquid flow path, the first liquid flow path The deformation of the elastic member between the second liquid flow path and the second liquid flow path is suppressed. Therefore, a gap is formed between the first liquid flow path and the second liquid member, through which the liquid flowing in one liquid flow path can leak to the other liquid flow path due to the deformation of the elastic member. Control that.

  The present disclosure can be realized in various forms other than the defoaming unit, the liquid discharge head, and the liquid discharge device. For example, it can be realized in the form of a method for manufacturing a defoaming unit or a liquid discharge head.

    DESCRIPTION OF SYMBOLS 1 ... Liquid discharger, 10 ... Outer shell, 11 ... Mounting part, 12 ... Head unit, 15 ... Transport mechanism, 17 ... Control part, 19 ... Carriage, 20 ... Media, 30 ... Liquid supply source, 100 ... Defoaming unit , 112: liquid introduction needle portion, 120: liquid flow path member, 122: liquid flow path, 124: liquid supply flow path, 124a, 124b: flow path structure, 126: liquid storage chamber, 128: communication hole, 130 .., First wall portion, 134, isolation wall, 140, gas flow channel member, 142, gas flow channel, 144, gas flow portion, 146, connection port, 150, second wall portion, 154, restriction wall 156 recess, 158 third opening, 160 elastic member, 162 transmitting section, 168 area, 170 head, 171 body part, 172 nozzle, 173 energy generating element, 192 pressure regulation Mechanism, 200 ... Bubble unit, 240: gas flow path member, 256: recess, 257: tapered surface, 260: elastic member, 267: protrusion, 300: defoaming unit, 340: gas flow path member, 412: head unit, 512 .. Head unit, 1222 first liquid channel, 1224 second liquid channel, 1242 first liquid supply channel, 1244 second liquid supply channel, 1262 first liquid Storage chamber, 1264: second liquid storage chamber, 1382: first opening, 1384: second opening, 1542: first regulating wall, 1544: second regulating wall, 1622: first transmission Section, 1624: second transmission section, M: motor

Claims (9)

A defoaming unit for removing bubbles in the liquid flowing through the liquid flow path,
A liquid channel member having a first opening communicating with the first liquid channel and a second opening communicating with the second liquid channel;
A gas flow path member having a third opening communicating with a gas flow path for flowing gas;
An elastic member that is permeable to gas, and is an elastic member that closes the first opening, the second opening, and the third opening between the liquid channel member and the gas channel member. And a member,
The elastic member,
The first liquid flow path and the gas flow path are located between the first opening and the third opening, and the gas in the first liquid flow path is separated from the first liquid flow path and the gas flow path. A first permeable portion for transmitting the gas to the gas flow path;
The second liquid flow path and the gas flow path are located between the second opening and the third opening, and the gas in the second liquid flow path is separated from the second liquid flow path and the gas flow path. A second permeation part for transmitting the gas to the gas flow path,
A region sandwiched between the liquid flow path member and the gas flow path member between the first transmission section and the second transmission section in the in-plane direction of the elastic member; , Defoaming unit. A defoaming unit for removing bubbles in the liquid flowing through the liquid flow path,
A liquid channel member having a first opening communicating with the first liquid channel and a second opening communicating with the second liquid channel;
A gas flow path member having a third opening communicating with a gas flow path for flowing gas;
An elastic member that is permeable to gas, and is an elastic member that closes the first opening, the second opening, and the third opening between the liquid channel member and the gas channel member. And a member,
The elastic member,
The first liquid flow path and the gas flow path are located between the first opening and the third opening, and the gas in the first liquid flow path is separated from the first liquid flow path and the gas flow path. A first permeable portion for transmitting the gas to the gas flow path;
The second liquid flow path and the gas flow path are located between the second opening and the third opening, and the gas in the second liquid flow path is separated from the second liquid flow path and the gas flow path. A second permeation part for transmitting the gas to the gas flow path,
Between the first permeable portion and the second permeable portion in the in-plane direction of the elastic member, the liquid flow path member and the gas flow path member form the gas flow path and the second flow path. A defoaming unit comprising: a region in which deformation in a direction connecting the first liquid flow path and the second liquid flow path is suppressed. It is a defoaming unit according to claim 1 or claim 2,
A connection port for connecting the gas flow path and a pump is formed in the gas flow path member,
The degassing unit, wherein the gas flow path member is configured to discharge gas in the gas flow path from the connection port. The defoaming unit according to any one of claims 1 to 3, wherein
The gas flow path member has a wall extending toward the elastic member between the first permeable portion and the second permeable portion,
A recess is formed at the tip of the wall on the elastic member side,
The defoaming unit, wherein the recess forms an opening at a contact surface between the elastic member and the wall. The defoaming unit according to claim 4, wherein
The concave portion is a tapered surface facing each other, and has a tapered surface in which the distance between each other gradually increases toward the side where the elastic member is disposed,
The defoaming unit, wherein the elastic member has a protrusion located in a space defined by the tapered surface. The defoaming unit according to claim 4 or claim 5,
The defoaming unit, wherein the size in the width direction of the opening formed by the recess is smaller than the size in the height direction of the opening formed by the recess. The defoaming unit according to any one of claims 1 to 6, wherein
The defoaming unit, wherein the elastic member seals a joint between the liquid flow path member and a member other than the liquid flow path member in the liquid flow path. A liquid discharge head that discharges liquid to the outside,
A defoaming unit according to any one of claims 1 to 7,
A liquid discharging head, comprising: an energy generating element for applying power for discharging the liquid flowing in the defoaming unit to the outside. A liquid ejection device,
A liquid ejection head according to claim 8,
A transport mechanism that has a motor as a power source and transports a medium that receives the liquid discharged from the liquid discharge head.

Images