JP6596237B2 - Inkjet head and inkjet recording apparatus - Google Patents

Description

  The present invention relates to an inkjet head and an inkjet recording apparatus.

  A technique related to an inkjet head of an inkjet recording apparatus has been proposed. For example, Patent Document 1 discloses a liquid discharge head. The liquid discharge head is configured by laminating and bonding a nozzle liquid chamber substrate, a vibration plate substrate, and an actuator substrate. The nozzle liquid chamber substrate is formed by integrally forming a nozzle plate and a liquid chamber member by electroforming using a metal material. The nozzle liquid chamber substrate has a nozzle, a liquid chamber, a fluid resistance portion, and a common liquid chamber. The liquid chamber communicates with a nozzle that discharges droplets. The fluid resistance portion communicates with the liquid chamber. The common liquid chamber supplies the recording liquid to each liquid chamber via the fluid resistance portion. The liquid chamber member forms a liquid chamber interval wall that separates the liquid chambers. The diaphragm substrate is formed of a metal material by an electroforming method. The diaphragm substrate has a diaphragm, a convex portion, and a supply port. In the diaphragm, a portion corresponding to the liquid chamber is a thin film. The convex portion is formed on the surface of the diaphragm opposite to the liquid chamber. The supply port supplies the recording liquid to the common liquid chamber. In the actuator substrate, the actuator and the support column are provided on a base substrate such as SUS. The actuator and the support column are made of a laminated piezoelectric element, and are joined to the convex portion of the diaphragm by an adhesive or the like. The liquid chamber member including the liquid chamber interval wall is formed of a metal material. The liquid chamber member is formed in a tapered shape in which the width in the direction in which the liquid chambers are arranged inclines continuously from the diaphragm side toward the nozzle plate side.

  Patent Document 2 discloses an ink jet printer head. The cavity unit of the ink jet printer head is composed of a nozzle plate, a damper plate, two manifold plates, three spacer plates, and a base plate, each of which is laminated by laminating and bonding a total of eight thin plates with an adhesive. Structured. Each of the aforementioned plates except for the synthetic resin nozzle plate is made of 42% nickel alloy steel plate. A spacer plate is bonded to the lower surface side of the base plate with an adhesive, and a piezoelectric actuator is bonded to the upper surface of the base plate. In the base plate, the rolling direction is a direction parallel to the short side direction of the base plate. In other words, in the base plate, the rolling direction is set along the longitudinal direction of the pressure chamber.

JP 2007-276149 A JP-A-2005-41047

  In the ink jet head, an internal flow path is formed inside. The internal flow path leads to the nozzle. The ink supplied to the inkjet head flows through the internal flow path, is supplied to the nozzle, and is ejected from the nozzle. The ink may contain bubbles. If bubbles contained in the ink remain at a predetermined position in the internal flow path, ink ejection failure may occur. The inventor studied the structure of the internal flow path that can suppress the bubbles from staying in the internal flow path and allow the bubbles to flow smoothly when the ink contains bubbles.

  An object of the present invention is to provide an ink jet head and an ink jet recording apparatus capable of suppressing bubbles contained in ink from stagnating in an internal flow path.

One aspect of the present invention is a plate-like member having a predetermined thickness, which forms a flow passage portion that is a part of an internal flow passage through which the ink is connected to a nozzle that ejects ink, and is a plate-like member An intermediate member formed with through-holes that open to the first side and the second side in the thickness direction, and a plate-like member having a predetermined thickness in the thickness direction, the first side in the thickness direction A plurality of first grooves that are joined to the intermediate member at the surface and perpendicular to the thickness direction and along the flow direction in which the ink flows through the flow path portion are formed on the first side surface in the thickness direction, A first joining member in which a first surface in the thickness direction forms a wall surface of the flow path portion together with an inner peripheral surface of the through-hole portion; and a plate-like member having a predetermined thickness in the thickness direction. And joined to the intermediate member on the second surface in the thickness direction, Are formed on the second side surface in the thickness direction, and the second side surface in the thickness direction is the inner circumferential surface of the through-hole portion and the thickness direction of the first joining member. A second bonding member that forms a wall surface of the flow path portion together with the first side surface, and the plurality of first grooves have a depth of 0.5 to 5 μm and a width of 0.5 to 5 μm. has a 20μm shape of the first joining member the a region in terms of the first side in the thickness direction to form a wall surface of the flow path section 50 to 1000 lines / mm is formed, the plurality of second groove A region having a shape with a depth of 0.5 to 5 μm and a width of 0.5 to 20 μm, and forming a wall surface of the flow path portion on the second side surface in the thickness direction of the second joining member The inkjet head is formed at 50 to 1000 lines / mm .

Another aspect of the present invention is a plate-like member having a predetermined thickness, which forms a flow path portion that is a part of an internal flow path through which the ink is connected to a nozzle that ejects ink, and has a plate-like shape. An intermediate member having through-holes that are open on the first side and the second side in the thickness direction of the member, and a plate-like member having a predetermined thickness in the thickness direction, the first member in the thickness direction A plurality of first grooves that are joined to the intermediate member on the side surface, perpendicular to the thickness direction and along the flow direction in which the ink flows through the flow path portion are formed on the first side surface in the thickness direction. A first joining member in which a first-side surface in the thickness direction forms a wall surface of the flow passage portion together with an inner peripheral surface of the through-hole portion, and a plate-like member having a predetermined thickness in the thickness direction And is joined to the intermediate member on the second surface in the thickness direction, and the thickness A second joining member, wherein the second surface in the direction forms the wall surface of the flow path portion together with the inner peripheral surface of the through-hole portion and the first side surface in the thickness direction of the first joining member; The plurality of first grooves have a shape with a depth of 0.5 to 5 μm and a width of 0.5 to 20 μm, and the first joining member has a surface on the first side in the thickness direction. 50 to 1000 lines / mm are formed in the region forming the wall surface of the flow path portion, and the second joining member ejects the ink from the nozzles onto the first surface in the thickness direction of the second joining member. In the inkjet head, the driving element that generates energy to be generated is a plate-like member having a predetermined thickness provided in a state corresponding to the through hole .

Still another aspect of the present invention is a plate-like member having a predetermined thickness, which forms a flow path portion that is a part of an internal flow path through which the ink is connected to a nozzle that ejects ink, and has a plate shape. An intermediate member formed with through-holes that open on the first side and the second side in the thickness direction of the member, and a plate-like member having a predetermined thickness in the thickness direction, A first joining member that is joined to the intermediate member at one side surface, and wherein the first side surface in the thickness direction forms a wall surface of the flow path portion together with an inner peripheral surface of the through-hole portion; A plate-like member having a predetermined thickness, which is joined to the intermediate member on the second surface in the thickness direction, orthogonal to the thickness direction, and in the flow direction in which the ink flows in the flow path portion. A plurality of second grooves along the surface are formed on the second surface in the thickness direction, A second joining member in which a second side surface in the only direction forms a wall surface of the flow path portion together with an inner peripheral surface of the through-hole portion and a first side surface in the thickness direction of the first joining member; The plurality of second grooves have a shape with a depth of 0.5 to 5 μm and a width of 0.5 to 20 μm, and are formed on the second surface in the thickness direction of the second joining member. 50 to 1000 lines / mm are formed in the region forming the wall surface of the flow path portion, and the second bonding member is formed on the first surface in the thickness direction of the second bonding member from the nozzle. The ink jet head is a plate-like member having a predetermined thickness provided with a drive element that generates energy to be ejected in a state corresponding to the through hole .

  According to the above-described ink jet head, a smooth ink flow can be realized in the flow path portion of the internal flow path. Even if air bubbles are included in the ink, the air bubbles can flow in the flow direction together with the ink flowing in the flow direction.

  In the inkjet head, the second joining member has a driving element that generates energy for ejecting the ink from the nozzle on the first surface in the thickness direction of the second joining member. A plate-shaped member having a predetermined thickness may be provided. According to this, the energy generated by the driving element can be applied to the ink stored in the flow path portion of the internal flow path. In other words, the energy generated by the drive element can be prevented from acting on the bubbles. In this case, the drive element may be a piezoelectric element. According to this, energy to act on the ink can be generated by the deformation of the piezoelectric element.

  Still another aspect of the present invention is an ink jet recording apparatus including any one of the ink jet heads described above. According to this, ink ejection failure from the nozzles can be suppressed. It is possible to suppress deterioration in the quality of images recorded by the ink jet recording apparatus.

  ADVANTAGE OF THE INVENTION According to this invention, the inkjet head and inkjet recording device which can suppress that the bubble contained in an ink stagnates in an internal flow path can be obtained.

1 is a perspective view illustrating a schematic configuration of an ink jet recording apparatus. It is a perspective view which shows schematic structure of an inkjet head. The upper part shows the drive element, the first plate, the second plate, the third plate, the fourth plate, the fifth plate, the sixth plate, and the seventh plate that form the inkjet head, as shown in FIG. It is sectional drawing cut in the position of S line. The lower part is a cross-sectional view of the inkjet head shown in FIG. 2 taken along the line PQRS. The lower part shows an example of the internal flow path of the inkjet head. The first surface of the second plate or the fourth surface of the fifth plate formed with a plurality of first grooves, or the second surface of the third plate or the fifth surface of the sixth plate formed with a plurality of second grooves. It is the elements on larger scale which show schematic structure. The partial enlarged view on the left side corresponds to the range on the third side in the main scanning direction of each surface of each plate described above. The partial enlarged view on the right side corresponds to the fourth range in the main scanning direction of each surface of each plate described above.

  Embodiments for carrying out the present invention will be described with reference to the drawings. The present invention is not limited to the configurations described below, and various configurations can be employed in the same technical idea. For example, some of the configurations shown below may be omitted or replaced with other configurations. Other configurations may be included.

<Inkjet recording apparatus>
The ink jet recording apparatus 10 will be described with reference to FIG. In the ink jet recording apparatus 10, the recording medium 15 is conveyed and an image is recorded on the recording medium 15. In the ink jet recording apparatus 10, images are recorded on various recording media 15. As the recording medium 15, for example, a fabric or a building material is used. In the embodiment, the case where the recording medium 15 is a long fabric is illustrated (see FIG. 1). The ink colors used for image recording are four colors of black, magenta, yellow and cyan. The ink color may be a color other than these. The number of ink colors may be 3 colors or less or 5 colors or more. A pattern given to the portion of the recording medium 15 illustrated on the downstream side in the transport direction in FIG. 1 corresponds to an image recorded on the recording medium 15.

  As shown in FIG. 1, the ink jet recording apparatus 10 includes a transport unit 20, ink jet heads 30K, 30M, 30Y, and 30C, a carriage 31, a moving unit 110, main tanks 120K, 120M, 120Y, and 120C. Flow paths 121K, 121M, 121Y, 121C are provided. The transport unit 20 transports the recording medium 15. The recording medium 15 transported by the transport unit 20 passes through the ink jet heads 30K, 30M, 30Y, and 30C. In the embodiment, a direction in which the recording medium 15 is transported by the transport unit 20 is referred to as a “transport direction”. A direction orthogonal to the transport direction is referred to as a “main scanning direction”. The conveyance direction and the opposite direction are collectively referred to as “sub-scanning direction”.

  The inkjet head 30K is an inkjet head that discharges black ink and records an image with the black ink. A plurality of nozzles 32 (see FIG. 3 to be described later) for discharging black ink are formed on the inkjet head 30K. The inkjet head 30M is an inkjet head that discharges magenta ink and records an image with the magenta ink. A plurality of nozzles 32 that eject magenta ink are formed in the inkjet head 30M. The inkjet head 30Y is an inkjet head that discharges yellow ink and records an image with the yellow ink. A plurality of nozzles 32 for discharging yellow ink are formed on the inkjet head 30Y. The inkjet head 30C is an inkjet head that discharges cyan ink and records an image with the cyan ink. A plurality of nozzles 32 that discharge cyan ink are formed in the inkjet head 30C.

  The inkjet heads 30K, 30M, 30Y, and 30C are mounted on the carriage 31 in a state where they are positioned at predetermined positions. As shown in FIG. 1, the inkjet heads 30K, 30M, 30Y, and 30C are mounted on the carriage 31 in a state of being adjacent to each other in the main scanning direction. The arrangement order of the inkjet heads 30K, 30M, 30Y, and 30C may be different from that shown in FIG. These arrangement orders are appropriately determined in consideration of various conditions. The other description regarding the inkjet heads 30K, 30M, 30Y, and 30C will be described later.

  The moving unit 110 moves the carriage 31 back and forth in the main scanning direction. As illustrated in FIG. 1, the moving unit 110 includes two pulleys 111 and 112, a timing belt 113, and a motor 114. The two pulleys 111 and 112 are respectively provided on both sides in the main scanning direction with the transport unit 20 as a reference. A motor 114 is connected to the pulley 111. The pulley 112 is rotatably supported. The pulley 111 rotates as the motor 114 rotates. The timing belt 113 is stretched over the pulleys 111 and 112 in a state where tension is applied. A carriage 31 on which the inkjet heads 30K, 30M, 30Y, and 30C are mounted is attached to the timing belt 113 via a support portion 115.

  The main tank 120K stores black ink. The supply flow path 121K connects the main tank 120K and the inkjet head 30K. The black ink flows out of the main tank 120K, flows through the supply channel 121K, and is supplied to the inkjet head 30K. The main tank 120M stores magenta ink. The supply flow path 121M connects the main tank 120M and the inkjet head 30M. The magenta ink flows out of the main tank 120M, flows through the supply channel 121M, and is supplied to the inkjet head 30M. The main tank 120Y stores yellow ink. The supply flow path 121Y connects the main tank 120Y and the inkjet head 30Y. The yellow ink flows out of the main tank 120Y, flows through the supply channel 121Y, and is supplied to the inkjet head 30Y. The main tank 120C stores cyan ink. The supply channel 121C connects the main tank 120C and the inkjet head 30C. The cyan ink flows out of the main tank 120C, flows through the supply channel 121C, and is supplied to the inkjet head 30C.

  In FIG. 1, the supply flow paths 121K, 121M, 121Y, and 121C are illustrated in a simplified state. The supply flow paths 121K, 121M, 121Y, and 121C are provided in a state that can handle the reciprocating movement of the carriage 31 in the main scanning direction. The inkjet heads 30K, 30M, 30Y, and 30C have the same configuration. The main tanks 120K, 120M, 120Y, and 120C have the same configuration. Supply flow paths 121K, 121M, 121Y, and 121C have the same configuration. In the embodiment, the inkjet heads 30K, 30M, 30Y, and 30C are referred to as “inkjet head 30” when they are not distinguished or are collectively referred to. When the main tanks 120K, 120M, 120Y, and 120C are not distinguished or are collectively referred to as “main tank 120”. When the supply channels 121K, 121M, 121Y, and 121C are not distinguished from each other or are collectively referred to as “supply channel 121”.

  The inkjet recording apparatus 10 includes a liquid feeding unit in addition to the above-described units. The ink stored in the main tank 120 flows through the supply channel 121 by the liquid feeding unit and is supplied to the inkjet head 30. In FIG. 1, the liquid feeding unit is not shown. As the liquid feeding unit, a liquid feeding unit similar to a known ink jet recording apparatus can be adopted. Therefore, the description regarding the liquid feeding unit is omitted.

  Image recording by the inkjet recording apparatus 10 is started when an image recording start command is input to the control device. In FIG. 1, illustration of the control device is omitted. The control device is communicably connected to the inkjet recording apparatus 10 and controls the inkjet recording apparatus 10. With the input of the start command to the control device, the moving unit 110 and the transport unit 20 operate as follows. That is, in the moving unit 110, the motor 114 connected to the pulley 111 reciprocally rotates clockwise and counterclockwise. As the motor 114 rotates, the pulley 111 rotates back and forth on both the left and right sides. An arc-shaped arrow shown inside the pulley 111 in FIG. 1 indicates the rotation direction of the pulley 111. When the pulley 111 rotates counterclockwise as the motor 114 rotates in a predetermined direction, the timing belt 113 rotates counterclockwise. The pulley 112 rotates following the timing belt 113 that rotates counterclockwise. Accordingly, the carriage 31 moves from the fourth side in the main scanning direction to the third side. When the carriage 31 reaches the third moving end in the main scanning direction, the rotation direction of the motor 114 is reversed and the pulley 111 rotates to the right. When the pulley 111 rotates to the right, the timing belt 113 also rotates to the right. The pulley 112 rotates following the timing belt 113 that rotates clockwise. Along with this, the carriage 31 moves from the third side to the fourth side in the main scanning direction. When the carriage 31 reaches the moving end on the fourth side in the main scanning direction, the rotation direction of the motor 114 is reversed again, and the pulley 111 rotates left again.

  The transport unit 20 transports the recording medium 15 in the transport direction in response to the reciprocation of the carriage 31 in the main scanning direction. That is, the conveyance of the recording medium 15 by the conveyance unit 20 is intermittently performed according to the reciprocation of the carriage 31 in the main scanning direction. The inks of the respective colors are ejected toward the recording medium 15 from the nozzles 32 formed on the inkjet heads 30K, 30M, 30Y, and 30C at a predetermined timing when the carriage 31 moves in the main scanning direction. Ink of each color ejected from each nozzle 32 of the inkjet heads 30K, 30M, 30Y, and 30C lands on the recording medium 15. An image is recorded on the recording medium 15 by the landed ink of each color.

  The moving unit 110 operates until image recording is completed. Therefore, the reciprocating movement of the carriage 31 in the main scanning direction is repeated until the image recording is completed. For example, the conveyance unit 20 stops at a predetermined timing after the image recording is completed. As the transport unit 20 stops, transport of the recording medium 15 in the transport direction also ends.

<Inkjet head>
The inkjet head 30 will be described with reference to FIGS. As described above, the inkjet heads 30K, 30M, 30Y, and 30C have the same configuration. That is, the ink jet heads 30K, 30M, 30Y, and 30C are ink jet heads having an aspect as shown in the lower part of FIGS. Accordingly, the following description will be made without distinguishing ink colors.

  Half of the plurality of nozzles 32 formed in the inkjet head 30 are arranged in the sub-scanning direction to form one nozzle row, and are arranged in a state where two nozzle rows are provided in the main scanning direction. In this case, the two nozzle rows are provided adjacent to each other in the main scanning direction while being shifted by a predetermined amount in the sub scanning direction. That is, the plurality of nozzles 32 are arranged in a staggered manner. Such an arrangement of the plurality of nozzles 32 is an example. Therefore, the arrangement of the plurality of nozzles 32 may be different from such an arrangement.

  The inkjet head 30 includes an internal flow path 33 (see the lower part of FIG. 3). The internal flow path 33 is a flow path formed inside the inkjet head 30. The internal flow path 33 flows the ink supplied to the inkjet head 30 through the supply port 34 (see FIG. 2) to the nozzle 32. The supply port 34 is connected to the end of the supply flow path 121 that is opposite to the end of the supply flow path 121 connected to the main tank 120. Each of the supply port 34 and the plurality of nozzles 32 is connected by an internal flow path 33. The ink supplied from the main tank 120 flows into the inkjet head 30 from the supply port 34 and flows through the internal flow path 33. The ink flowing through the internal flow path 33 reaches each of the plurality of nozzles 32 and is ejected from each nozzle 32.

  2 and 3, the inkjet head 30 includes a plurality of drive elements 39, a first plate 40, a second plate 50, a third plate 60, a fourth plate 70, and a fifth plate 80. And a sixth plate 90 and a seventh plate 100. The first plate 40, the second plate 50, the third plate 60, the fourth plate 70, the fifth plate 80, the sixth plate 90, and the seventh plate 100 are formed of, for example, a metal material plate. Examples of the metal material that forms each member described above include stainless steel and nickel. When the metal material is stainless steel, the above-described members are formed by etching or pressing. When the metal material is nickel, the above-described members are formed by, for example, electroforming.

  In the embodiment, the thickness direction of the first plate 40, the second plate 50, the third plate 60, the fourth plate 70, the fifth plate 80, the sixth plate 90, and the seventh plate 100 is referred to as a “thickness direction”. One side in the thickness direction is referred to as a “first side”, and the side opposite to the first side in the thickness direction is referred to as a “second side”. In the ink jet recording apparatus 10, the thickness direction is the vertical direction. The first side in the thickness direction is the upper side in the vertical direction, and the second side in the thickness direction is the lower side in the vertical direction.

  The first plate 40, the second plate 50, the third plate 60, the fourth plate 70, the fifth plate 80, the sixth plate 90, and the seventh plate 100 are stacked in the thickness direction. Each of the aforementioned plates is arranged from the first side to the second side in the thickness direction from the third plate 60, the first plate 40, the second plate 50, the sixth plate 90, the fourth plate 70, the fifth plate 80, and the like. The seventh plate 100 is laminated in this order. The plates stacked in the above order are joined by an adhesive. 2 and 3, the illustration of the adhesive layer in which the adhesive for joining the aforementioned plates is cured is omitted. In the embodiment, the first plate 40, the second plate 50, the third plate 60, the fourth plate 70, the fifth plate 80, the sixth plate 90, and the seventh plate 100 are joined by an adhesive (see FIGS. The lower part of FIG.

  For example, when focusing on the first plate 40, the second plate 50, and the third plate 60 in the joined state, the first plate 40 is an intermediate portion disposed between the second plate 50 and the third plate 60 in the thickness direction. It becomes a member. The second plate 50 is a first joining member that is joined to the first plate 40 as an intermediate member on the first surface 53. The first surface 53 is a surface on the first side in the thickness direction of the second plate 50. The third plate 60 is a second joining member that is joined to the first plate 40 as an intermediate member on the second surface 61. The second surface 61 is a surface on the second side in the thickness direction of the third plate 60.

  Unlike the above, when focusing on the fourth plate 70, the fifth plate 80, and the sixth plate 90 in the joined state, the fourth plate 70 is disposed between the fifth plate 80 and the sixth plate 90 in the thickness direction. It becomes an intermediate member. The fifth plate 80 is a first joining member that is joined to the fourth plate 70 as an intermediate member on the fourth surface 82. The fourth surface 82 is a surface on the first side in the thickness direction of the fifth plate 80. The sixth plate 90 is a second joining member that is joined to the fourth plate 70 as an intermediate member on the fifth surface 93. The fifth surface 93 is a surface on the second side in the thickness direction of the sixth plate 90.

  The first plate 40, the second plate 50, the fourth plate 70, the fifth plate 80, and the sixth plate 90 are formed with through-hole portions to be described later. In the joined state, the internal flow path 33 is formed by connecting through holes formed in each of the above-described plates. The internal flow path 33 includes a main flow part 35 and a plurality of branch parts. The main flow part 35 is a part of the internal flow path 33 having the supply port 34 as an end. The main flow part 35 is provided in a state extending in the sub-scanning direction. The tributary portion is a portion of the internal flow path 33 that branches from the main flow portion 35 toward the nozzles 32. One branch part connected to one nozzle 32 includes a pressure chamber 36, a first flow path 37, and a second flow path 38 (see the lower part of FIG. 3). Each of the pressure chamber 36, the first flow path 37, and the second flow path 38 is a flow path portion that forms the internal flow path 33. The pressure chamber 36 is a space elongated in the main scanning direction. Ink is stored in the pressure chamber 36. The ink stored in the pressure chamber 36 flows from the main flow portion 35 into the first flow path 37, flows through the first flow path 37, and flows into the pressure chamber 36. The ink stored in the pressure chamber 36 flows from the pressure chamber 36 to the second flow path 38 and reaches the nozzle 32. In the lower part of FIG. 3, the portion of the tributary part of the internal flow path 33 is mainly illustrated.

  A through hole 41 is formed in the first plate 40. The through-hole portion 41 is a through-hole portion that forms the internal flow path 33 described above. The through hole 41 is a hole that opens on the first side and the second side in the thickness direction and penetrates the first plate 40 in the thickness direction (see the upper part of FIG. 3). The through hole 41 is a long hole. The through-hole portion 41 forms a flow path portion that is a part of the internal flow path 33. The aforementioned flow path portion formed by the through hole portion 41 is the pressure chamber 36. In the joined state, the inner peripheral surface (wall surface) of the through hole portion 41 forms a part of the wall surface of the pressure chamber 36. In the embodiment, the longitudinal direction of the through hole 41 coincides with the main scanning direction. The direction in which the ink flows through the through hole 41 and a through hole 71 of the fourth plate 70 described later is referred to as a “flow direction”. The flow direction is orthogonal to the thickness direction. In the tributary part of the internal flow path 33 connected to each nozzle 32 of the nozzle row provided on the third side in the main scanning direction, the flow direction in the through hole 41 is from the fourth side to the third side in the main scanning direction. . In the tributary part of the internal flow path 33 connected to each nozzle 32 of the nozzle row provided on the fourth side in the main scanning direction, the flow direction in the through hole 41 is from the third side to the fourth side in the main scanning direction. .

  Through-hole portions 51 and 52 are formed in the second plate 50. The through hole portions 51 and 52 are through hole portions that form the internal flow path 33 described above. The through-hole portions 51 and 52 are holes that open on the first side and the second side in the thickness direction and penetrate the second plate 50 in the thickness direction (see the upper part of FIG. 3). The through hole 51 connects the first flow path 37 and the pressure chamber 36 in the internal flow path 33. The ink stored in the pressure chamber 36 passes through the through hole 51 and flows into the pressure chamber 36 from the first flow path 37. The through hole 51 may be referred to as a restrictor. The through hole 52 connects the pressure chamber 36 and the second flow path 38 in the internal flow path 33. The ink stored in the pressure chamber 36 passes through the through hole 52 and flows out from the pressure chamber 36 to the second flow path 38.

  As shown in FIG. 4, a plurality of first grooves 54 are formed on the first surface 53 of the second plate 50. For example, the first groove 54 is formed on the entire first surface 53 in a state along the flow direction. For example, the first groove 54 is formed by polishing the first surface 53. In this case, the 1st surface 53 of the 2nd plate 50 is grind | polished in the state in which the grinding | polishing groove | channel by grinding | polishing becomes a main scanning direction in a joining state. Accordingly, the plurality of first grooves 54 can be formed on the first surface 53 in a state along the flow direction. The first groove 54 is a streak-like groove having a depth of about 0.5 to 5 μm and a width of about 0.5 to 20 μm. The first groove 54 is formed at about 50 to 1000 lines / mm in a direction orthogonal to both the thickness direction and the flow direction. In FIG. 4, the plurality of first grooves 54 are illustrated in a simplified state without considering the correspondence with the above-described aspect. In the embodiment, the direction orthogonal to both the thickness direction and the flow direction is the sub-scanning direction. The width direction of the first groove 54 is also the sub-scanning direction (the same applies to the first groove 83 and the second grooves 62 and 94 described later). In the joined state, the first surface 53 formed with the plurality of first grooves 54 forms the wall surface of the pressure chamber 36 together with the inner peripheral surface of the through hole portion 41 of the first plate 40.

  As shown in FIG. 4, a plurality of second grooves 62 are formed on the second surface 61 of the third plate 60. For example, the second groove 62 is formed on the entire second surface 61 in a state along the flow direction. For example, the second groove 62 is formed by polishing the second surface 61. In this case, the second surface 61 of the third plate 60 is polished in a state where the polishing groove by polishing is in the main scanning direction in the bonded state. Thereby, the plurality of second grooves 62 can be formed on the second surface 61 in a state along the flow direction. The second groove 62 is a streak-like groove having the same shape as the first groove 54. The number per unit length in the direction (sub-scanning direction) orthogonal to both the thickness direction and the flow direction is also the same as that of the first groove 54. In FIG. 4, the plurality of second grooves 62 are illustrated in a simplified state without considering the correspondence with the above-described aspect. In the joined state, the second surface 61 on which the plurality of second grooves 62 are formed is the wall surface of the pressure chamber 36 together with the inner peripheral surface of the through hole 41 of the first plate 40 and the first surface 53 of the second plate 50. Form.

  A drive element 39 is provided on the third plate 60. The drive element 39 is joined to the third surface 63 of the third plate 60 in a state corresponding to the through hole 41 (pressure chamber 36) of the first plate 40. The third surface 63 is a surface on the first side in the thickness direction of the third plate 60. The drive element 39 sandwiches the third plate 60 and faces the through hole 41 (pressure chamber 36) of the first plate 40. An adhesive is used for joining the drive elements 39. 2 and 3, the illustration of the adhesive layer in which the adhesive that joins the drive element 39 and the third plate 60 is cured is omitted. The description regarding the drive element 39 is mentioned later.

  Through holes 71 and 72 are formed in the fourth plate 70. The through hole portions 71 and 72 are through hole portions that form the internal flow path 33 described above. The through-hole portions 71 and 72 are holes that open on the first side and the second side in the thickness direction and penetrate the fourth plate 70 in the thickness direction (see the upper part of FIG. 3). The through hole 71 is a long hole. The through hole 71 forms a flow path portion that is a part of the internal flow path 33. The aforementioned flow path portion formed by the through hole 71 is the first flow path 37. In the joined state, the inner peripheral surface (wall surface) of the through hole portion 71 forms the wall surface of the first flow path 37. The inner peripheral surface of the through hole portion 71 opens at a position connected to the main flow portion 35. In the embodiment, the longitudinal direction of the through hole portion 71 coincides with the main scanning direction like the through hole portion 41 of the first plate 40. The ink flowing from the main flow portion 35 flows through the through hole portion 71 in the flow direction. In the tributary part of the internal flow path 33 connected to each nozzle 32 of the nozzle row provided on the third side in the main scanning direction, the flow direction in the through hole 71 is from the fourth side in the main scanning direction to the third side. . In the tributary part of the internal flow path 33 connected to each nozzle 32 of the nozzle row provided on the fourth side in the main scanning direction, the flow direction in the through hole 71 is from the third side to the fourth side in the main scanning direction. .

  The through hole 72 forms a flow path portion that is a part of the internal flow path 33. The aforementioned flow path portion formed by the through hole portion 72 is the second flow path 38. In the joined state, the inner peripheral surface (wall surface) of the through hole portion 72 forms the wall surface of the second flow path 38.

  A through hole 81 is formed in the fifth plate 80. The through hole portion 81 is a through hole portion that forms the internal flow path 33 described above. The through-hole portion 81 is a hole portion that opens on the first side and the second side in the thickness direction and penetrates the fifth plate 80 (see the upper part of FIG. 3). The through-hole portion 81 forms a flow path portion that is a part of the internal flow path 33. The aforementioned flow path portion formed by the through hole 81 is the second flow path 38. In the joined state, the inner peripheral surface (wall surface) of the through hole portion 81 forms the wall surface of the second flow path 38 together with the inner peripheral surface of the through hole portion 72 of the fourth plate 70.

  As shown in FIG. 4, a plurality of first grooves 83 are formed in the fourth surface 82 of the fifth plate 80. The first groove 83 is formed, for example, on the entire surface of the fourth surface 82 in the state along the flow direction, like the first groove 54 formed on the first surface 53 of the second plate 50. For example, the first groove 83 is formed by polishing the fourth surface 82. In this case, the fourth surface 82 of the fifth plate 80 is polished in a state where the polishing groove by polishing is in the main scanning direction in the bonded state. Thereby, the plurality of first grooves 83 can be formed on the fourth surface 82 in a state along the flow direction. The first groove 83 is a streak-like groove having the same shape as the first groove 54 and the second groove 62. The number per unit length in the direction (sub-scanning direction) perpendicular to both the thickness direction and the flow direction is also the same as that of the first groove 54 and the second groove 62. In FIG. 4, the plurality of first grooves 83 are illustrated in a simplified state without considering the correspondence with the above-described aspect. In the joined state, the fourth surface 82 formed with the plurality of first grooves 83 forms the wall surface of the first flow path 37 together with the inner peripheral surface of the through hole portion 71 of the fourth plate 70.

  Through holes 91 and 92 are formed in the sixth plate 90. The through hole portions 91 and 92 are through hole portions that form the internal flow path 33 described above. The through-hole portions 91 and 92 are holes that open on the first side and the second side in the thickness direction and penetrate the sixth plate 90 in the thickness direction (see the upper part of FIG. 3). The through hole portion 91 forms a flow path portion that is a part of the internal flow path 33. The aforementioned flow path portion formed by the through hole portion 91 is the first flow path 37. In the joined state, the inner peripheral surface (wall surface) of the through hole portion 91 forms the wall surface of the first flow path 37 together with the inner peripheral surface of the through hole portion 71 of the fourth plate 70 and the fourth surface 82 of the fifth plate 80. To do. The through hole portion 92 forms a flow path portion that is a part of the internal flow path 33. The aforementioned flow path portion formed by the through hole portion 92 is the second flow path 38. In the joined state, the inner peripheral surface (wall surface) of the through hole portion 92 is the wall surface of the second flow path 38 together with the inner peripheral surfaces of the through hole portion 72 of the fourth plate 70 and the through hole portion 81 of the fifth plate 80. Form.

  As shown in FIG. 4, a plurality of second grooves 94 are formed on the fifth surface 93 of the sixth plate 90. Similarly to the second groove 62 formed on the second surface 61 of the third plate 60, the second groove 94 is formed, for example, on the entire surface of the fifth surface 93 in a state along the flow direction. For example, the second groove 94 is formed by polishing the fifth surface 93. In this case, the fifth surface 93 of the sixth plate 90 is polished in a state where the polishing groove by polishing is in the main scanning direction in the bonded state. Thereby, the plurality of second grooves 94 can be formed on the fifth surface 93 in a state along the flow direction. The second groove 94 is a streak-like groove having the same shape as the first grooves 54 and 83 and the second groove 62. The number per unit length in the direction (sub-scanning direction) perpendicular to both the thickness direction and the flow direction is also the same as that of the first grooves 54 and 83 and the second groove 62. In FIG. 4, the plurality of second grooves 94 are illustrated in a simplified state without considering the correspondence with the above-described aspect. In the joined state, the fifth surface 93 in which the plurality of second grooves 94 are formed includes the inner peripheral surface of the through hole portion 71 of the fourth plate 70, the fourth surface 82 of the fifth plate 80, and the inside of the through hole portion 91. A wall surface of the first flow path 37 is formed together with the peripheral surface.

  The seventh plate 100 includes a plurality of nozzles 32. That is, in the inkjet head 30, the plurality of nozzles 32 are formed on the seventh plate 100. In addition, the seventh plate 100 includes an inflow portion 101. The inflow portion 101 connects the nozzle 32 and the second flow path 38. The inflow portion 101 is a flow path for flowing ink flowing through the second flow path 38 to the nozzle 32. The ink flowing through the second flow path 38 passes through the inflow portion 101 from the second flow path 38 and reaches the nozzle 32.

  The drive element 39 generates energy for ejecting ink from the nozzles 32. An example of the driving element 39 is a piezo element. When the driving element 39 is a piezo element, energy for ejecting ink from the nozzle 32 is generated by the deformation of the piezo element. The piezo element is deformed in response to application of a voltage. The energy generated by the drive element 39 acts on the ink stored in the pressure chamber 36. That is, the pressure associated with the deformation of the piezo element acts on the ink stored in the pressure chamber 36. The ink stored in the pressure chamber 36 flows into the second flow path 38 from the pressure chamber 36 through the through hole 52 due to the pressure acting on the ink. Along with this, ink is ejected from the nozzle 32. As the driving element 39, a heater can be adopted as in the known ink jet head. When the drive element 39 is a heater, the energy for ejecting ink from the nozzle 32 is the thermal energy generated by the heater.

<Effect of embodiment>
In the inkjet head 30, the pressure chamber 36 is formed by the through hole 41 of the first plate 40, the second plate 50, and the third plate 60. In the pressure chamber 36, a plurality of first grooves 54 are formed on the first surface 53 of the second plate 50 that is the second wall surface in the thickness direction. In the pressure chamber 36, a plurality of second grooves 62 are formed on the second surface 61 of the third plate 60 which is the first wall surface in the thickness direction. The first groove 54 and the second groove 62 are streak-like grooves having a shape along the flow direction. In the inkjet head 30, the first flow path 37 is formed by the through hole 71 of the fourth plate 70, the fifth plate 80, and the sixth plate 90. In the first flow path 37, a plurality of first grooves 83 are formed on the fourth surface 82 of the fifth plate 80 that is the second wall surface in the thickness direction. In the first flow path 37, a plurality of second grooves 94 are formed on the fifth surface 93 of the sixth plate 90 which is the wall surface on the first side in the thickness direction. The first groove 83 and the second groove 94 are streak-like grooves along the flow direction.

  Therefore, a smooth ink flow can be realized in the pressure chamber 36 and the first flow path 37. Even if air bubbles are included in the ink, the air bubbles can flow in the flow direction together with the ink flowing in the flow direction. By causing the bubbles to flow out from the pressure chamber 36, the energy generated by the drive element 39 can be applied to the ink stored in the pressure chamber 36. In other words, it is possible to suppress the energy generated by the drive element 39 from acting on the bubbles.

  In the inkjet head 30, the plurality of branch portions of the internal flow path 33 connected to the nozzles 32 of the nozzle row arranged on the third side or the fourth side in the main scanning direction are adjacent to each other in a state of being close to the sub scanning direction. Provided. That is, the plurality of pressure chambers 36 and the plurality of first flow paths 37 are provided adjacent to each other while being close to each other in the sub-scanning direction. Therefore, when joining the first plate 40, the second plate 50, and the third plate 60 with an adhesive, there is a concern that the adhesive moves in the sub-scanning direction and easily protrudes to the pressure chamber 36 side. The When the fourth plate 70, the fifth plate 80, and the sixth plate 90 are joined with an adhesive, there is a concern that the adhesive may move in the sub-scanning direction and easily protrude into the first flow path 37 side. .

  However, in the inkjet head 30, the movement of the adhesive in the sub-scanning direction as described above can be suppressed as follows. That is, by forming a plurality of first grooves 54 along the flow direction on the first surface 53 of the second plate 50, the movement of the adhesive sandwiched between the first plate 40 and the second plate 50 in the sub-scanning direction is performed. Can be suppressed by the first groove 54. By forming a plurality of second grooves 62 along the flow direction on the second surface 61 of the third plate 60, the movement of the adhesive sandwiched between the first plate 40 and the third plate 60 in the sub-scanning direction is It can be suppressed by the second groove 62. In the sub-scanning direction, the sticking out of the adhesive into the pressure chamber 36 can be suppressed.

  By forming a plurality of first grooves 83 along the flow direction on the fourth surface 82 of the fifth plate 80, the movement of the adhesive sandwiched between the fourth plate 70 and the fifth plate 80 in the sub-scanning direction is It can be suppressed by the first groove 83. By forming a plurality of second grooves 94 along the flow direction on the fifth surface 93 of the sixth plate 90, the movement of the adhesive sandwiched between the fourth plate 70 and the sixth plate 90 in the sub-scanning direction is It can be suppressed by the second groove 94. In the sub-scanning direction, the sticking out of the adhesive to the first flow path 37 can be suppressed.

<Modification>
The embodiment can also be performed as follows. Some configurations of the modifications shown below can be appropriately combined and employed. Hereinafter, points different from the above will be described, and description of similar points will be omitted as appropriate.

  (1) In the inkjet recording apparatus 10, an image is recorded on the recording medium 15 that is transported in the transport direction by the transport unit 20 while the carriage 31 is reciprocated in the main scanning direction by the moving unit 110 (see FIG. 1). An ink jet recording apparatus of a type different from the ink jet recording apparatus 10 has been put into practical use. This different type of ink jet recording apparatus includes an ink jet head called a line type. The structure of the inkjet head 30 can also be adopted for a line-type inkjet head. In the line-type inkjet head, the plurality of nozzles are arranged in the main scanning direction that coincides with the short direction of the recording medium 15. The range in the main scanning direction in which the nozzles are arranged is, for example, not less than the width W of the recording medium 15 (see FIG. 1). The number of nozzle rows may be a plurality of rows as described above. For example, when the number of nozzle rows is two, the two nozzle rows are arranged in the sub-scanning direction.

  When the line-type inkjet head has the same structure as the inkjet head 30 shown in FIGS. 2 and 3, the flow direction described above is as follows. In this description, in order to clarify the correspondence with the above, the same reference numerals are used for the same or corresponding configurations. In the line-type inkjet head 30, the longitudinal direction of the through-hole portions 41 and 71 coincides with the sub-scanning direction.

  In the through holes 41 and 71 in the internal flow path 33 connected to the nozzles 32 of the nozzle row arranged on the side corresponding to the upstream side in the transport direction among both sides in the sub-scanning direction, the flow direction is the transport direction. The opposite direction (the direction from the downstream side to the upstream side). A plurality of first grooves 54 are formed on the first surface 53 of the second plate 50 along the aforementioned flow direction. A plurality of second grooves 62 are formed on the second surface 61 of the third plate 60 along the aforementioned flow direction. In the through-hole portions 41 and 71 in the internal flow path 33 connected to each nozzle 32 of the nozzle row arranged on the side corresponding to the downstream side in the transport direction among both sides in the sub-scanning direction, the flow direction is the transport direction. Become. A plurality of first grooves 83 are formed on the fourth surface 82 of the fifth plate 80 along the aforementioned flow direction. A plurality of second grooves 94 are formed on the fifth surface 93 of the sixth plate 90 in a state along the flow direction described above.

  (2) In the inkjet recording apparatus 10, the main tank 120 and the inkjet head 30 are directly connected via the supply flow path 121 (see FIG. 1). The ink jet recording apparatus 10 may include a sub tank in addition to the above-described units. A sub tank is provided corresponding to each ink jet head 30 for each color. The sub tank for each color is provided in the middle of the supply flow path 121 for each color. The sub tank stores the ink supplied from the main tank 120 via the first portion of the supply channel 121. The ink stored in the sub tank flows out of the sub tank, flows through the second portion of the supply channel 121, and is supplied to the inkjet head 30. The first part of the supply channel 121 is a part of the supply channel 121 that connects the main tank 120 and the sub tank. The second part of the supply channel 121 is a part of the supply channel 121 that connects the sub tank and the inkjet head 30. Of the both end portions of the second portion of the supply flow path 121, the end portion on the ink jet head 30 side is connected to the supply port 34.

  (3) The inner peripheral surface of the through hole 41 of the first plate 40, the first surface 53 of the second plate 50, and the second surface 61 of the third plate 60 form a wall surface of the pressure chamber 36 (see FIG. 3). ). A plurality of first grooves 54 are formed on the first surface 53 of the second plate 50 along the flow direction (see FIG. 4). A plurality of second grooves 62 along the flow direction are formed on the second surface 61 of the third plate 60 (see FIG. 4). Regarding the wall surface of the pressure chamber 36, the first groove 54 or the second groove 62 may be omitted. It is assumed that the first groove 54 is omitted. In this case, the first surface of the second plate is, for example, a smooth flat surface having no unevenness as compared with the first surface 53 on which the first groove 54 is formed. It is assumed that the second groove 62 is omitted. In this case, the second surface of the third plate is, for example, a smooth flat surface having no unevenness as compared with the second surface 61 in which the second groove 62 is formed.

  The inner peripheral surface of the through hole 71 of the fourth plate 70, the fourth surface 82 of the fifth plate 80, and the fifth surface 93 of the sixth plate 90 form the wall surface of the first flow path 37 (see FIG. 3). A plurality of first grooves 83 are formed in the fourth surface 82 of the fifth plate 80 along the flow direction (see FIG. 4). A plurality of second grooves 94 are formed in the fifth surface 93 of the sixth plate 90 along the flow direction (see FIG. 4). Regarding the wall surface of the first flow path, the first groove 83 or the second groove 94 may be omitted. It is assumed that the first groove 83 is omitted. In this case, the fourth surface of the fifth plate is, for example, a smooth flat surface having no unevenness as compared with the fourth surface 82 in which the first groove 83 is formed. It is assumed that the second groove 94 is omitted. In this case, the fifth surface of the sixth plate is, for example, a smooth flat surface having no irregularities as compared with the fifth surface 93 in which the second groove 94 is formed.

  (4) The first plate 40, the second plate 50, the third plate 60, the fourth plate 70, the fifth plate 80, the sixth plate 90, and the seventh plate 100 are each a single plate having a predetermined thickness. (See the upper part of FIG. 3). Each of the aforementioned plates may be formed as a single plate as shown in the upper part of FIG. 3 by laminating and joining a plurality of plate-like members in the thickness direction. Regarding the seventh plate 100, it is assumed that two plate-like members are laminated and joined in the thickness direction. In this case, a through-hole portion serving as the inflow portion 101 is formed in the plate-like member disposed on the first side in the thickness direction. A plurality of nozzles 32 are formed on the plate-like member arranged on the second side in the thickness direction. For example, the above plate-like member in which the through-hole portion serving as the inflow portion 101 is formed may be formed by further laminating and joining a plurality of plate-like members in the thickness direction.

DESCRIPTION OF SYMBOLS 10 Inkjet recording device, 15 Recording medium, 20 Conveyance part 30,30K, 30M, 30Y, 30C Inkjet head, 31 Carriage 32 Nozzle, 33 Internal flow path, 34 Supply port, 35 Main flow part, 36 Pressure chamber 37 First flow path, 38 2nd flow path, 39 Drive element, 40 1st plate 41 Through-hole part, 50 2nd plate, 51,52 Through-hole part, 53 1st surface 54 1st groove | channel, 60 3rd plate, 61 2nd surface, 62 2nd groove 63 3rd surface, 70 4th plate, 71,72 Through-hole part 80 5th plate, 81 Through-hole part, 82 4th surface, 83 1st groove 90 6th plate, 91,92 Through-hole part 93, fifth surface, 94 second groove, 100 seventh plate, 101 inflow portion, 110 moving portion, 111, 112 pulley, 113 timing belt, 114 Motor 115 support section, 120, 120K, 120M, 120Y, 120C main tank 121, 121K, 121M, 121Y, 121C supply flow path, W width

Claims (6)

A plate-shaped member having a predetermined thickness, which forms a flow channel portion that is a part of an internal flow channel through which the ink is connected to a nozzle that ejects ink, and is a first side in the thickness direction of the plate-shaped member And an intermediate member in which a through-hole portion opened on the second side is formed,
A plate-like member having a predetermined thickness in the thickness direction, which is joined to the intermediate member on a first side in the thickness direction, and the ink flows through the flow path portion perpendicular to the thickness direction. A plurality of first grooves along the flow direction are formed on the first side surface in the thickness direction, and the first side surface in the thickness direction forms the wall surface of the flow path portion together with the inner peripheral surface of the through-hole portion. Forming a first joining member;
A plate-like member having a predetermined thickness in the thickness direction, which is joined to the intermediate member on a second surface in the thickness direction, and a plurality of second grooves along the flow direction are formed in the thickness direction. A wall surface of the flow path portion is formed on the second side surface, the second side surface in the thickness direction together with the inner peripheral surface of the through hole portion and the first side surface in the thickness direction of the first joining member. Forming a second joining member,
The plurality of first grooves are
It has a shape with a depth of 0.5-5 μm and a width of 0.5-20 μm,
50-1000 pieces / mm are formed in the region where the wall surface of the flow path part is formed on the first surface in the thickness direction of the first joining member,
The plurality of second grooves are
It has a shape with a depth of 0.5-5 μm and a width of 0.5-20 μm,
The inkjet head formed in 50-1000 piece / mm in the area | region which forms the wall surface of the said flow-path part in the surface by the side of the said thickness direction of the said 2nd joining member. A plate-shaped member having a predetermined thickness, which forms a flow channel portion that is a part of an internal flow channel through which the ink is connected to a nozzle that ejects ink, and is a first side in the thickness direction of the plate-shaped member And an intermediate member in which a through-hole portion opened on the second side is formed,
A plate-like member having a predetermined thickness in the thickness direction, which is joined to the intermediate member on a first side in the thickness direction, and the ink flows through the flow path portion perpendicular to the thickness direction. A plurality of first grooves along the flow direction are formed on the first side surface in the thickness direction, and the first side surface in the thickness direction forms the wall surface of the flow path portion together with the inner peripheral surface of the through-hole portion. Forming a first joining member;
A plate-like member having a predetermined thickness in the thickness direction, which is joined to the intermediate member on a second side surface in the thickness direction, and the second side surface in the thickness direction is inside the through hole portion. Forming a wall surface of the flow path portion together with a circumferential surface and a first side surface in the thickness direction of the first bonding member, and a second bonding member,
The plurality of first grooves are
It has a shape with a depth of 0.5-5 μm and a width of 0.5-20 μm,
50-1000 pieces / mm are formed in the region where the wall surface of the flow path part is formed on the first side surface in the thickness direction of the first joining member ,
The second bonding member is provided on the first surface in the thickness direction of the second bonding member with a driving element that generates energy for ejecting the ink from the nozzle corresponding to the through hole. An inkjet head , which is a plate-like member having a predetermined thickness . A plate-shaped member having a predetermined thickness, which forms a flow channel portion that is a part of an internal flow channel through which the ink is connected to a nozzle that ejects ink, and is a first side in the thickness direction of the plate-shaped member And an intermediate member in which a through-hole portion opened on the second side is formed,
A plate-like member having a predetermined thickness in the thickness direction, which is joined to the intermediate member at a first side surface in the thickness direction, and the first side surface in the thickness direction is within the through hole portion. Forming a wall surface of the flow path part together with a peripheral surface, a first joining member;
A plate-like member having a predetermined thickness in the thickness direction, joined to the intermediate member on the second side in the thickness direction, and the ink flows perpendicularly to the thickness direction and through the flow path portion. A plurality of second grooves along the flow direction are formed on the second side surface in the thickness direction, and the second side surface in the thickness direction is the inner peripheral surface of the through-hole portion and the first joining member. Forming a wall surface of the flow path part together with the first side surface in the thickness direction, and a second joining member,
The plurality of second grooves are
It has a shape with a depth of 0.5-5 μm and a width of 0.5-20 μm,
50-1000 pieces / mm are formed in a region where the wall surface of the flow path part is formed on the second side surface in the thickness direction of the second joining member ,
The second bonding member is provided on the first surface in the thickness direction of the second bonding member with a driving element that generates energy for ejecting the ink from the nozzle corresponding to the through hole. An inkjet head , which is a plate-like member having a predetermined thickness . The second bonding member is provided on the first surface in the thickness direction of the second bonding member with a driving element that generates energy for ejecting the ink from the nozzle corresponding to the through hole. The inkjet head according to claim 1, wherein the inkjet head is a plate-like member having a predetermined thickness. The inkjet head according to any one of claims 2 to 4 , wherein the driving element is a piezoelectric element.   An ink jet recording apparatus comprising the ink jet head according to any one of claims 1 to 5.

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