Liquid jet head and liquid jet device

Abstract

To solve the problem that in a conventional liquid jet head, a flow of a liquid toward a common liquid chamber on a recovery side from a pressure chamber is likely to cause stagnation.SOLUTION: A liquid jet head 1 includes a nozzle for jetting a liquid in a first direction, and an individual flow channel communicating with the nozzle, wherein the individual flow channel includes a pressure chamber extending in a second direction perpendicular to the first direction, a first part extending in the second direction, and a second part which makes the pressure chamber and the end in the second direction of the first part communicate with each other and extends in the first direction, the first part includes a first surface formed with the nozzle, the second part includes a first wall surface facing a third direction opposite to the second direction, the individual flow channel has a first connection surface arranged between the first wall surface and the first surface, and the first connection surface approaches the third direction as going to the first direction.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a liquid ejection head and a liquid ejection apparatus. [Background technology]

[0002] Patent document 1 discloses a liquid ejection head including a nozzle that ejects liquid in a first direction, an individual flow path connected to the nozzle, a supply-side common liquid chamber that supplies liquid to the individual flow path, and a recovery-side common liquid chamber that recovers liquid from the individual flow path. In the liquid ejection head, each individual flow path has a pressure chamber extending in a second direction perpendicular to the first direction, a first portion extending in the second direction for recovering liquid that has not been ejected from the nozzle, and a second portion extending in the first direction and connecting the pressure chamber with the first portion. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-065249 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the liquid jet head of Patent Document 1, when the liquid flowing through the second part flows toward the first part, the flow of liquid turns at a right angle, which may cause stagnation in the flow of liquid from the second part to the first part. [Means for solving the problem]

[0005] A liquid ejection head according to one embodiment of the present invention comprises a nozzle that ejects liquid in a first direction and an individual flow path communicating with the nozzle, wherein the individual flow path includes a pressure chamber extending in a second direction perpendicular to the first direction, a first portion extending in the second direction, and a second portion that communicates with the pressure chamber and an end of the first portion in the second direction and extends in the first direction, wherein the first portion includes a first surface on which the nozzle is formed, and the second portion includes a first wall surface facing the third direction that is opposite to the second direction, and the individual flow path has a first connection surface arranged between the first wall surface and the first surface, and the first connection surface approaches the third direction as it approaches the first direction.

[0006] A liquid ejection device according to one embodiment of the present invention is characterized in that it comprises the above-mentioned liquid ejection head and a circulation mechanism that circulates liquid between the inside and outside of the liquid ejection head via the individual flow paths. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is an explanatory diagram illustrating an example of a liquid ejection device 100. [Diagram 2] FIG. 4 is a block diagram illustrating a circulation mechanism 94. [Diagram 3] FIG. 2 is an exploded perspective view of the liquid jet head 1. [Figure 4] FIG. 2 is a cross-sectional view of the liquid jet head 1. [Diagram 5] FIG. 4 is an enlarged cross-sectional view of the vicinity of the piezoelectric element PZ. [Figure 6] Cross-sectional view of circulation flow path RJ. [Figure 7] FIG. 4 is an enlarged cross-sectional view of the vicinity of an intersection portion AR. [Figure 8] 4 is a cross-sectional view of a circulation flow path provided in the liquid jet head 1Z, as viewed in the Y-axis direction. FIG. [Figure 9] FIG. 4 is an enlarged cross-sectional view of the vicinity of an intersection portion AR. [Figure 10] FIG. 4 is an enlarged cross-sectional view of the vicinity of an intersection portion AR. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, the embodiments for carrying out the present invention will be described with reference to the drawings. However, in each drawing, the dimensions and scale of each part are appropriately different from the actual ones. In addition, since the embodiments described below are preferred specific examples of the present invention, various technically preferable limitations are attached, but the scope of the present invention is not limited to these embodiments unless otherwise specified in the following description to the effect that the present invention is limited.

[0009] 1: First embodiment A liquid ejecting apparatus 100 according to this embodiment will be described below with reference to FIG.

[0010] 1-1: Overview of liquid injection device 1 is an explanatory diagram showing an example of a liquid ejection device 100 according to the present embodiment. The liquid ejection device 100 according to the present embodiment is an inkjet printing device that ejects ink, which is an example of a liquid, onto a medium PP. The medium PP is typically printing paper, but any printing target such as a resin film or fabric can be used as the medium PP. 1, the liquid ejecting device 100 includes a liquid container 93 that stores ink. As the liquid container 93, for example, a cartridge that is detachable from the liquid ejecting device 100, a bag-shaped ink pack formed of a flexible film, or an ink tank that can be refilled with ink can be used.

[0011] As illustrated in FIG. 1, the liquid ejecting apparatus 100 includes a control device 90, a transport mechanism 91, a moving mechanism 92, and a circulation mechanism 94. Of these, the control device 90 includes a processing circuit such as a CPU or FPGA, and a storage circuit such as a semiconductor memory, and controls each element of the liquid ejection device 100. Here, CPU is an abbreviation for Central Processing Unit, and FPGA is an abbreviation for Field Programmable Gate Array. The transport mechanism 91 transports the medium PP in the +Y direction under the control of the control device 90. Note that, hereinafter, the +Y direction and the -Y direction opposite to the +Y direction are collectively referred to as the Y-axis direction. Note that the +Y direction is an example of the "fourth direction." Further, under the control of the control device 90, the movement mechanism 92 reciprocates the multiple liquid jet heads 1 in the +X direction and the -X direction, which is the direction opposite to the +X direction. Note that, hereinafter, the +X direction and the -X direction are collectively referred to as the X-axis direction. Here, the +X direction is a direction that intersects with the +Y direction. Typically, the +X direction is a direction perpendicular to the +Y direction. Note that the -X direction is an example of the "second direction." Furthermore, the +X direction is an example of the "third direction." The moving mechanism 92 includes a storage case 921 that stores a plurality of liquid ejecting heads 1, and an endless belt 922 to which the storage case 921 is fixed. Note that the liquid container 93 may be stored in the storage case 921 together with the liquid ejecting heads 1.

[0012] Further, under the control of the control device 90, the circulation mechanism 94 supplies the ink stored in the liquid container 93 to a supply flow path RC provided in the liquid jet head 1. Further, under the control of the control device 90, the circulation mechanism 94 recovers the ink stored in a discharge flow path RA provided in the liquid jet head 1, and returns the recovered ink to the supply flow path RC. The supply flow path RC and the discharge flow path RA will be described later with reference to FIGS. 4 and 5. Next, an example of the circulation mechanism 94 will be described with reference to Fig. 2. Fig. 2 is a block diagram illustrating the circulation mechanism 94. The circulation mechanism 94 is composed of a liquid container 93 as a main tank, a supply tank 131, a circulation tank 132, a compressor 133, a vacuum pump 134, a first liquid feed pump 135, a second liquid feed pump 136, a supply side pressure sensor 137, a circulation side pressure sensor 138, regulators (R) 139a, 139b, and a flow path pipe for communicating each of these elements. The flow path pipe is formed of, for example, an elastic tube. In FIG. 2, the arrows indicate the flow path pipe. The supply tank 131, the flow path pipe for communicating the supply tank 131 with a supply port 52 (to be described later) provided in the liquid jet head 1, the flow path pipe for communicating the discharge port 51 (to be described later) provided in the liquid jet head 1 with the circulation tank 132, the circulation tank 132, and the flow path pipe for communicating the circulation tank 132 with the supply tank 131 constitute a circulation flow path RL provided outside the liquid jet head 1. The supply-side pressure sensor 137 is located between the supply tank 131 and the liquid jet head 1, and is connected to a flow path connected to the supply port 52 of the liquid jet head 1. The circulation-side pressure sensor 138 is located between the liquid jet head 1 and the circulation tank 132, and is connected to a flow path connected to the discharge port 51 of the liquid jet head 1. One side of the circulation tank 132 is connected to the supply tank 131 via a first liquid feed pump 135, and the other side of the circulation tank 132 is connected to the liquid container 93 via a second liquid feed pump 136. As a result, liquid flows from the supply tank 131 into the liquid jet head 1 through the supply port 52, passes through a circulation flow path RJ inside the liquid jet head 1, and is discharged from the discharge port 51 to the circulation tank 132. The first liquid feed pump 135 then sends the liquid from the circulation tank 132 to the supply tank 131, thereby circulating the liquid. Further, a compressor 133 is connected to the supply tank 131, and is controlled so that a supply-side pressure sensor 137 detects a predetermined positive pressure. Meanwhile, a vacuum pump 134 is connected to the circulation tank 132, and is controlled so that a circulation-side pressure sensor 138 detects a predetermined negative pressure. This allows the negative pressure of the meniscus to be kept constant while circulating the liquid through the circulation flow path RJ in the liquid ejection head 1. Furthermore, when liquid is ejected from the nozzle N, the amount of liquid in the supply tank 131 and the circulation tank 132 decreases. Therefore, the second liquid feed pump 136 is used to replenish the liquid from the liquid container 93 to the circulation tank 132 as appropriate. The timing of refilling the liquid from the liquid container 93 to the circulation tank 132 can be controlled based on the detection result of a liquid level sensor or the like provided in the circulation tank 132, such as refilling the liquid when the liquid level in the circulation tank 132 falls below a predetermined level.

[0013] As illustrated in FIG. 1, the liquid jet head 1 is supplied with a drive signal Com for driving the liquid jet head 1 and a control signal SI for controlling the liquid jet head 1 from a control device 90. The liquid jet head 1 is driven by the drive signal Com under the control of the control signal SI, and ejects ink in the +Z direction from some or all of the multiple nozzles N provided in the liquid jet head 1. The +Z direction is a direction intersecting the +X direction and the +Y direction. Typically, the +Z direction is a direction perpendicular to the +X direction and the +Y direction. Hereinafter, the +Z direction and the -Z direction, which is the opposite direction to the +Z direction, may be collectively referred to as the Z-axis direction. The +Z direction is an example of a "first direction." The nozzle N will be described later with reference to FIGS. The liquid ejection head 1 ejects ink from some or all of the multiple nozzles N in conjunction with the transportation of the medium PP by the transport mechanism 91 and the reciprocating movement of the liquid ejection head 1 by the movement mechanism 92, and causes the ejected ink to land on the surface of the medium PP, thereby forming a desired image on the surface of the medium PP.

[0014] 1-2: Overview of liquid jet heads 3 to 6, an overview of the liquid jet head 1 will be described. Fig. 3 is an exploded perspective view of the liquid jet head 1. Fig. 4 is a cross-sectional view of the liquid jet head 1 cut parallel to the XZ plane so as to pass through the circulation flow path RJ.

[0015] As illustrated in FIGS. 3 and 4, the liquid jet head 1 includes a nozzle substrate 60, a compliance sheet 61, a communication plate 2, a pressure chamber substrate 3, a vibration plate 4, a storage chamber forming substrate 5, and a wiring substrate 8.

[0016] As illustrated in FIG. 3 and FIG. 4, the nozzle substrate 60 is a plate-like member that is long in the Y-axis direction and extends approximately parallel to the XY plane, and is provided with a nozzle row Ln. Here, "approximately parallel" is a concept that includes a case where it is completely parallel, as well as a case where it is considered to be parallel when an error is taken into consideration. Here, the nozzle row Ln is a collection of multiple nozzles N that are provided so as to extend in the Y-axis direction. The nozzle substrate 60 is manufactured by processing a silicon single crystal substrate using a semiconductor manufacturing technique such as etching. However, known materials and manufacturing methods can be arbitrarily adopted for manufacturing the nozzle substrate 60. Also, the nozzles N are through holes provided in the nozzle substrate 60.

[0017] 3 and 4, a communication plate 2 is provided on the -Z side of the nozzle substrate 60. The communication plate 2 is a plate-shaped member that is elongated in the Y-axis direction and extends substantially parallel to the XY plane, and forms an ink flow path. Specifically, the communication plate 2 is formed with a discharge flow passage RA, a part of the discharge flow passage RB, and a supply flow passage RC. Of these, the discharge flow passage RA is provided so as to extend in the X-axis direction. The discharge flow passage RB is provided so as to communicate with an end of the discharge flow passage RA in the +X direction, and to extend in the Z-axis direction in the -Z direction as viewed from the discharge flow passage RA. The supply flow passage RC is provided so as to communicate with a supply flow passage RD, which will be described later, and to extend in the X-axis direction in the -Z direction as viewed from the discharge flow passage RA. In addition, the communication plate 2 is formed with a portion of a plurality of communication channels RR, a plurality of intersections AR, and a plurality of nozzle channels RN corresponding to each of the plurality of nozzles N. The portion of the communication channel RR is a portion on the +Z side of the communication channel RR. The communication channel RR is provided so as to extend in the Z-axis direction in the -X direction as viewed from the connection channel RK. The intersection AR communicates the communication channel RR with the nozzle channel RN, and is located in the +Z direction as viewed from the communication channel RR and in the -X direction as viewed from the nozzle channel RN. In addition, the nozzle channel RN, together with the channels R1 and R2, communicates the discharge channel RA with the communication channel RR, and is provided so as to extend in the X-axis direction in the +Z direction as viewed from the communication channel RR and the connection channel RK. The nozzle channel RN communicates with the nozzle N corresponding to the nozzle channel RN. 3 and 4, the communicating plate 2 includes a first communicating plate 21 and a second communicating plate 22. The second communicating plate 22 is laminated on the surface of the first communicating plate 21 facing the -Z direction. The communicating plate 2 is manufactured by processing a single crystal silicon substrate using semiconductor manufacturing technology, for example. However, any known material or manufacturing method may be used to manufacture the communicating plate 2.

[0018] 3 and 4, a pressure chamber substrate 3 is provided on the -Z side of the communication plate 2. The pressure chamber substrate 3 is a plate-shaped member that is elongated in the Y-axis direction and extends approximately parallel to the XY plane, and has an ink flow path formed therein. Specifically, the pressure chamber substrate 3 is formed with a plurality of pressure chambers CB corresponding to the respective nozzles N, a plurality of connection flow paths RK, and a remainder of a plurality of communication flow paths RR. The connection flow path RK communicates with the supply flow path RC and is provided so as to extend in the Z-axis direction in the -Z direction as viewed from the supply flow path RC. The remainder of the communication flow path RR is the -Z side portion of the communication flow path RR. The pressure chamber CB communicates between the connection flow path RK and the communication flow path RR, and is provided so as to extend in the X-axis direction, connecting the -Z side end of the connection flow path RK and the -Z side end of the communication flow path RR when viewed in the Y-axis direction. The pressure chamber substrate 3 is manufactured by processing a single crystal silicon substrate using, for example, semiconductor manufacturing technology. However, any known material or manufacturing method may be used to manufacture the pressure chamber substrate 3.

[0019] The flow paths provided inside the liquid jet head 1, that is, the ink flow paths configured by the supply port 52, the supply flow path RD, the supply flow path RC, the connection flow path RK, the pressure chamber CB, the communication flow path RR, the intersection portion AR, the nozzle flow path RN, the flow path R1, the flow path R2, the discharge flow path RA, the discharge flow path RB, and the discharge port 51, are referred to as the circulation flow path RJ. Here, the multiple connection flow paths RK are connected to a common supply flow path RC, and the multiple flow paths R2 are connected to a common discharge flow path RA. In other words, the portion of the circulation flow path RJ from the connection flow path RK to the flow path R2 corresponds to an "individual flow path" provided corresponding to each of the multiple nozzles N. In other words, the circulation flow path RJ branches independently from each other for each of the multiple nozzles N in the portion from the connection flow path RK to the flow path R2.

[0020] 3 and 4, a vibration plate 4 is provided on the -Z side of the pressure chamber substrate 3. The vibration plate 4 is a plate-like member that is elongated in the Y-axis direction and extends approximately parallel to the XY plane, and is a member that can vibrate elastically.

[0021] 3 and 4, a plurality of piezoelectric elements PZ corresponding to the plurality of pressure chambers CB are provided on the -Z side of the vibration plate 4. The piezoelectric elements PZ are passive elements that deform in response to a change in potential of the drive signal Com. In other words, the piezoelectric elements PZ are an example of an energy conversion element that converts the electrical energy of the drive signal Com into kinetic energy.

[0022] FIG. 5 is an enlarged cross-sectional view of the vicinity of the piezoelectric element PZ. 5, the piezoelectric element PZ is a laminate in which a piezoelectric body ZM is interposed between a lower electrode ZD to which a predetermined reference potential VBS is supplied and an upper electrode ZU to which a drive signal Com is supplied. When viewed in the +Z direction, for example, the piezoelectric element PZ is a portion where the lower electrode ZD, the upper electrode ZU, and the piezoelectric body ZM overlap. In addition, a pressure chamber CB is provided in the +Z direction of the piezoelectric element PZ. As described above, the piezoelectric element PZ is driven and deformed in response to the change in potential of the drive signal Com. The vibration plate 4 vibrates in conjunction with the deformation of the piezoelectric element PZ. When the vibration plate 4 vibrates, the pressure in the pressure chamber CB fluctuates. As the pressure in the pressure chamber CB fluctuates, the ink filled in the pressure chamber CB is ejected in the +Z direction from the nozzle N via the communication flow path RR and the nozzle flow path RN.

[0023] As illustrated in FIG. 3 and FIG. 4, a wiring board 8 is mounted on the surface of the vibration plate 4 on the -Z side. The wiring board 8 is a component for electrically connecting the control device 90 and the liquid jet head 1. As the wiring board 8, for example, a flexible wiring board such as FPC or FFC is preferably adopted. Here, FPC is an abbreviation for Flexible Printed Circuit, and FFC is an abbreviation for Flexible Flat Cable. A driving circuit 81 is mounted on the wiring board 8. The driving circuit 81 is an electric circuit that switches whether or not to supply a driving signal Com to the piezoelectric element PZ under the control of a control signal SI. As illustrated in FIG. 5, the driving circuit 81 supplies the driving signal Com to the upper electrode ZU of the piezoelectric element PZ via a wiring 810.

[0024] 3 and 4, a storage chamber forming substrate 5 is provided on the -Z side of the communication plate 2. The storage chamber forming substrate 5 is a member that is elongated in the Y-axis direction, and has an ink flow path formed therein. Specifically, the reservoir chamber forming substrate 5 is formed with the supply flow path RD and a portion of the discharge flow path RB that is not included in the communication plate 2. Of these, the supply flow path RD is connected to the supply flow path RC and is provided so as to extend in the Z-axis direction in the -Z direction as viewed from the supply flow path RC. The discharge flow path RB is connected to the discharge flow path RA and is provided so as to extend in the Z-axis direction in the -Z direction as viewed from the discharge flow path RA. The storage chamber forming substrate 5 is provided with a discharge port 51 communicating with the discharge flow path RB and a supply port 52 communicating with the supply flow path RD. Ink is supplied to the supply flow path RD from the circulation flow path RL via the supply port 52. The ink stored in the discharge flow path RB is collected in the circulation flow path RL via the discharge port 51. Furthermore, an opening 50 is provided in the storage chamber forming substrate 5. Inside the opening 50, a pressure chamber substrate 3, a vibration plate 4, and a wiring substrate 8 are provided. The reservoir chamber forming substrate 5 is formed, for example, by injection molding of a resin material. However, the reservoir chamber forming substrate 5 can be manufactured using any known material or method.

[0025] In this embodiment, ink supplied from the circulation flow channel RL to the supply port 52 flows into the supply flow channel RC via the supply flow channel RD. Then, a portion of the ink that flows into the supply flow channel RC flows into the pressure chamber CB via the connection flow channel RK. In addition, a portion of the ink that flows into the pressure chamber CB flows through the communication flow channel RR, the nozzle flow channel RN, the flow channel R1, the flow channel R2, the discharge flow channel RA, and the discharge flow channel RB, and is discharged from the discharge port 51. When the piezoelectric element PZ is driven by the drive signal Com, a portion of the ink filled in the pressure chamber CB is ejected from the nozzle N via the communication flow path RR and the nozzle flow path RN.

[0026] 3 and 4, a compliance sheet 61 is provided on the +Z side surface of the communication plate 2 so as to block the discharge flow path RA. The compliance sheet 61 is made of an elastic material and absorbs pressure fluctuations of the ink in the discharge flow path RA.

[0027] As described above, the liquid jet head 1 according to this embodiment circulates ink within the circulation flow path RJ. Therefore, in this embodiment, even if there is a period in which the ink inside the pressure chamber CB is not ejected from the nozzle N, it is possible to prevent the ink from remaining stagnant inside the pressure chamber CB and in the nozzle flow path RN, etc. Therefore, in this embodiment, even if there is a period in which the ink inside the pressure chamber CB is not ejected from the nozzle N, it is possible to suppress the ink inside the pressure chamber CB from thickening, and it is possible to prevent the occurrence of an ejection abnormality in which the ink cannot be ejected from the nozzle N due to the thickening of the ink.

[0028] 1-3: Shape of the circulation flow path Hereinafter, the shape of the circulation flow path RJ will be described with reference to FIG.

[0029] FIG. 6 is a cross-sectional view of the circulation channel RJ.

[0030] As illustrated in FIG. 6, the communication flow path RR has a wall surface HRa facing the +X direction and a wall surface HRb facing the -X direction when viewed in the Y-axis direction. The normal of the wall surface HRa is in the +X direction, and the normal of the wall surface HRb is in the -X direction. In addition to these wall surfaces, the communication flow path RR is defined by an end EC in the -Z direction, which is a boundary with the pressure chamber CB, and an end ER in the +Z direction, which is a boundary with the intersection portion AR. Here, the wall surface HRa is a wall surface extending in the Z-axis direction when viewed in the Y-axis direction. The wall surface HRb is the wall surface opposite to the wall surface HRa of the two wall surfaces constituting the communication flow path RR, and is a wall surface extending in the Z-axis direction when viewed in the Y-axis direction.

[0031] Moreover, the nozzle flow path RN has a wall surface HNa facing the -Z direction, a wall surface HNb facing the +Z direction, and a wall surface HNc facing the -X direction when viewed in the Y-axis direction. The normal of the wall surface HNa faces the -Z direction, the normal of the wall surface HNb faces the +Z direction, and the normal of the wall surface HNc faces the -X direction. Here, the wall surface HNa is a wall surface on which the nozzle N is formed among the wall surfaces constituting the nozzle flow path RN, and is a wall surface extending in the X-axis direction when viewed in the Y-axis direction. Moreover, the wall surface HNb is a wall surface opposite to the wall surface HNa among the three wall surfaces constituting the nozzle flow path RN when viewed in the Y-axis direction, and is a wall surface extending in the X-axis direction when viewed in the Y-axis direction. Moreover, the wall surface HNc constitutes the end of the nozzle flow path RN in the +X direction, and is a wall surface extending in the Z-axis direction when viewed in the Y-axis direction.

[0032] Furthermore, an intersection AR that connects the communication flow path RR and the nozzle flow path RN is provided between the communication flow path RR and the nozzle flow path RN. The intersection AR is defined by an end ER of the communication flow path RR in the +Z direction, a wall surface HRa, a connection surface Hj3 (described later), a wall surface HNa, an end EN of the nozzle flow path RN in the -X direction, and a connection surface Hj4 (described later).

[0033] Also, the flow path R1 has a wall surface H1a facing the -Z direction, a wall surface H1b facing the +Z direction, a wall surface H1c facing the +X direction, and a wall surface H1d facing the -X direction when viewed in the Y-axis direction. Here, the wall surface H1a is a wall surface extending in the X-axis direction when viewed in the Y-axis direction. The normal line of the wall surface H1a is oriented in the -Z direction. Also, the wall surface H1b is a wall surface opposite to the wall surface H1a among the four wall surfaces constituting the flow path R1 when viewed in the Y-axis direction, and is a wall surface extending in the X-axis direction when viewed in the Y-axis direction. The normal line of the wall surface H1b is oriented in the +Z direction. Also, the wall surface H1c constitutes the end portion of the flow path R1 in the -X direction, and is a wall surface extending in the Z-axis direction when viewed in the Y-axis direction. The normal line of the wall surface H1c is oriented in the +X direction. In addition, it is preferable that the wall surface H1c is located at the same position as the wall surface HNc in the X-axis direction or in the -X direction from the wall surface HNc. The wall surface H1d constitutes the end of the flow path R1 in the +X direction and is a wall surface that extends in the Z-axis direction when viewed in the Y-axis direction. The normal line of the wall surface H1d faces the -X direction.

[0034] Also, the flow path R2 has a wall surface H2a facing the -Z direction, a wall surface H2b facing the +Z direction, and a wall surface H2c facing the +X direction when viewed in the Y-axis direction. Here, the wall surface H2a is a wall surface extending in the X-axis direction when viewed in the Y-axis direction. The normal line of the wall surface H2a is in the -Z direction. Also, the wall surface H2b is a wall surface opposite to the wall surface H2a among the three wall surfaces constituting the flow path R2 when viewed in the Y-axis direction, and is a wall surface extending in the X-axis direction when viewed in the Y-axis direction. The normal line of the wall surface H2b is in the +Z direction. Also, the wall surface H2c constitutes the end portion of the flow path R2 in the -X direction, and is a wall surface extending in the Z-axis direction when viewed in the Y-axis direction. It is preferable that the wall surface H2c is located at the same position as the wall surface H1d in the X-axis direction, or in the -X direction from the wall surface H1d. The normal of wall H2c faces the +X direction.

[0035] 6, a connection surface Hj2 extending in the W2 direction when viewed in the Y-axis direction is provided between wall surface HCa and wall surface HRa facing the +Z direction of the pressure chamber CB. More specifically, the connection surface Hj2 is provided so as to connect the wall surface HCa and the wall surface HRa. Here, the W2 direction is a direction between the -X direction and the +Z direction when viewed in the Y-axis direction. In this embodiment, the connection surface Hj2 is provided such that the angle θ2 between the normal direction of the connection surface Hj2 and the normal direction of the wall surface HCa is equal to or greater than 30 degrees and less than 60 degrees. The connection surface Hj2 may be an inclined surface that inclines along the W2 direction. Alternatively, the connection surface Hj2 may have a part that is an inclined surface and another part that is a curved surface. Alternatively, the connection surface Hj2 may be a curved surface in its entirety.

[0036] In addition, a connection surface Hj3 is provided between the wall surface HRa and the wall surface HNa, extending in the W3 direction when viewed in the Y-axis direction. More specifically, the connection surface Hj3 is provided so as to connect the wall surface HRa and the wall surface HNa. The connection surface Hj3 in this embodiment is an inclined surface that inclines along the W3 direction. Here, the W3 direction is a direction between the +X direction and the +Z direction when viewed in the Y-axis direction. In this embodiment, the connection surface Hj3 is provided such that the angle θ3 between the normal direction of the connection surface Hj3 and the normal direction of the wall surface HNa is equal to or greater than 30 degrees and less than 60 degrees. The connection surface Hj3 may have a part that is an inclined surface and another part that is a curved surface, or the entire connection surface Hj3 may be a curved surface.

[0037] In addition, a connection surface Hj4 is provided between the wall surface HRb and the wall surface HNb, extending in the W4 direction when viewed in the Y-axis direction. More specifically, the connection surface Hj4 is provided so as to connect the wall surface HRb and the wall surface HNb. The connection surface Hj4 in this embodiment is an inclined surface that inclines along the W4 direction. Here, the W4 direction is a direction between the +X direction and the +Z direction when viewed in the Y-axis direction. In this embodiment, the connection surface Hj4 is provided such that the angle θ4 between the normal direction of the connection surface Hj4 and the normal direction of the wall surface HRb is equal to or greater than 30 degrees and less than 60 degrees. The connection surface Hj4 may have a part that is an inclined surface and another part that is a curved surface, or the entire connection surface Hj4 may be a curved surface.

[0038] Further, a connection surface Hj5 extending in the W5 direction when viewed in the Y-axis direction is provided between the wall surface HNb and the wall surface H1c. More specifically, the connection surface Hj5 is provided so as to connect the wall surface HNb and the wall surface H1c. Here, the W5 direction is a direction between the +X direction and the -Z direction when viewed in the Y-axis direction. In this embodiment, the connection surface Hj5 is provided such that the angle θ5 between the normal direction of the connection surface Hj5 and the normal direction of the wall surface HNb is 30 degrees or more and less than 60 degrees. The connection surface Hj5 may be an inclined surface that inclines along the W5 direction. Alternatively, the connection surface Hj5 may have a part that is an inclined surface and another part that is a curved surface. Alternatively, the connection surface Hj5 may be entirely a curved surface.

[0039] Further, a connection surface Hj6 extending in the W6 direction when viewed in the Y-axis direction is provided between the wall surface HNc and the wall surface H1a. More specifically, the connection surface Hj6 is provided so as to connect the wall surface HNc and the wall surface H1a. Here, the W6 direction is a direction between the +X direction and the -Z direction when viewed in the Y-axis direction. In this embodiment, the connection surface Hj6 is provided such that the angle θ6 between the normal direction of the connection surface Hj6 and the normal direction of the wall surface HNc is equal to or greater than 30 degrees and less than 60 degrees. The connection surface Hj6 may be an inclined surface that inclines along the W6 direction. Alternatively, the connection surface Hj6 may have a part that is an inclined surface and another part that is a curved surface. Alternatively, the connection surface Hj6 may be entirely a curved surface.

[0040] In the cross-sectional view shown in Fig. 6, the wall surface HNc may not be present between the connection surface Hj6 and the wall surface HNa. In other words, the connection surface Hj6 may be directly connected to the wall surface HNa. In addition, the wall surface H2c may not be present between the connection surface Hj7 and the wall surface H2a. In other words, the connection surface Hj7 may be directly connected to the wall surface H2a.

[0041] In addition, a connection surface Hj7 extending in the W7 direction when viewed in the Y-axis direction is provided between the wall surface H1a and the wall surface H2c. More specifically, the connection surface Hj7 is provided so as to connect the wall surface H1a and the wall surface H2c.

[0042] Further, a connection surface Hj8 extending in the W8 direction when viewed in the Y-axis direction is provided between the wall surface H1d and the wall surface H2b. More specifically, the connection surface Hj8 is provided so as to connect the wall surface H1d and the wall surface H2b.

[0043] 6 shows flows FL1 and FL2 as examples of the flow of ink passing through the pressure chamber CB, communicating flow path RR, intersection portion AR, and nozzle flow path RN of the circulation flow path RJ. In the pressure chamber CB, the flow FL1 is located in the +Z direction from the flow FL2. In the communicating flow path RR, the flow FL1 is located in the +X direction from the flow FL2. At the intersection portion AR, the flow FL1 is located in the +X direction and in the -Z direction from the flow FL2. In the nozzle flow path RN, the flow FL1 is located in the -Z direction from the flow FL2.

[0044] As a result, the pigment P that settles to the bottom surface of the pressure chamber CB is carried by the flow FL1, not the flow FL2. At the intersection AR and the nozzle flow path RN, the flow FL1 is located farther from the nozzle N than the flow FL2. Furthermore, the flow FL1 flows along the connection surface Hj4 and the wall surface HNb. Moreover, the flow FL2 flows along the connection surface Hj3 and the wall surface HNa located in the vicinity of the nozzle N. The flow FL1 carrying the pigment P cannot cross the flow FL2. For this reason, the flow FL1 carrying the pigment P is suppressed from flowing into the nozzle N. As a result, it is possible to suppress the flow of the pigment P into the nozzle N.

[0045] In this embodiment, the communication flow path RR is an example of a "second portion." The intersection portion AR, the nozzle flow path RN, the flow path R1, and the flow path R2 as a whole are an example of a "first portion." In other words, the second portion communicates the -X direction end EC of the pressure chamber CB with the -X direction end ER of the first portion. Wall surface HRa is an example of a "first wall surface." Wall surface HRb is an example of a "second wall surface." Connection surface Hj3 is an example of a "first connection surface" and also an example of a "first inclined surface." Connection surface Hj4 is an example of a "second connection surface" and also an example of a "second inclined surface." Wall surface HNa is an example of a "first surface." Wall surface HNb is an example of a "second surface."

[0046] 6, the connection surface Hj3, the wall surface HNc, the connection surface Hj6, the wall surface H1a, the connection surface Hj7, the wall surface H2c, the connection surface Hj4, the wall surface HNb, the connection surface Hj5, the wall surface H1c, the wall surface H1d, the connection surface Hj8, the wall surface H2b, and the connection surface Hj9 are formed on the first communicating plate 21. The wall surface H1b is formed on the second communicating plate 22. However, this is merely an example, and each wall surface and each connecting surface may be formed on either the first communicating plate 21 or the second communicating plate 22 as long as they are in the positional relationship described above. Also, the communicating plate 2 does not have to include only the first communicating plate 21 and the second communicating plate 22, and may be composed of only one plate, or may be composed of three or more plates stacked together.

[0047] 1-4: Configuration near the nozzle Hereinafter, the configuration in the vicinity of the nozzle N will be described with reference to FIG.

[0048] Fig. 7 is an enlarged cross-sectional view of the vicinity of the intersection AR in Fig. 6. In Fig. 7, the first center position C1 is a position in the X-axis direction, and is the center position between the position ERb in the X-axis direction of the wall surface HRb and the position Ej3 in the X-axis direction of the end portion in the +X direction of the connection surface Hj3. The second center position C2 is a position in the X-axis direction, and is the center position between the position ERb in the X-axis direction of the wall surface HRb and the position ERa in the X-axis direction of the wall surface HRa.

[0049] The nozzle N is disposed between the position Ej3 and the position ERb in the X-axis direction. In this embodiment, the nozzle N is disposed in the -X direction from the first center position C1. Moreover, at the intersection AR, the nozzle N is disposed in the -X direction from the second center position C2. Moreover, when the intersection AR is viewed in the Y-axis direction, the opening NP on the -Z side of the nozzle N is disposed on an extension of a line segment indicating an inclined surface included in the connection surface Hj3. Moreover, when the intersection AR is viewed in the Y-axis direction, the opening NP on the -Z side of the nozzle N is located in the -X direction from the intersection point between a straight line including a line segment indicating the wall surface HNa and a straight line including a line segment indicating an inclined surface included in Hj4.

[0050] Furthermore, the connection surface Hj3 approaches the +X direction as it moves in the +Z direction. Similarly, the connection surface Hj4 approaches the +X direction as it moves in the +Z direction. It is preferable that the connection surface Hj3 and the connection surface Hj4 are approximately parallel to each other.

[0051] As shown in FIG. 8, the connection surface Hj3 and the connection surface Hj4 preferably overlap in a direction perpendicular to the connection surface Hj3.

[0052] 1-5: Reference example In order to clarify the effects of this embodiment, a liquid jet head 1Z according to a reference example will be described below with reference to FIG.

[0053] FIG. 8 is a cross-sectional view of a circulation channel RJ provided in a liquid jet head 1Z according to a reference example, as viewed in the Y-axis direction. As shown in FIG. 8, the liquid jet head 1Z is configured similarly to the liquid jet head 1 according to the present embodiment, but is different in the following respects. Specifically, in the liquid jet head 1Z, the wall surface HCa and the wall surface HRa are connected, and the connection surface Hj2 is not provided between the wall surface HCa and the wall surface HRa. In addition, in the liquid jet head 1Z, the wall surface HRa and the wall surface HNa are connected, and the connection surface Hj3 is not provided between the wall surface HRa and the wall surface HNa. In addition, in the liquid jet head 1Z, the wall surface HNa and the wall surface HNc are connected, and the connection surface Hj4 is not provided between the wall surface HRb and the wall surface HNb. In addition, in the liquid jet head 1Z, the wall surface HNb and the wall surface H1c are connected, and the connection surface Hj5 is not provided between the wall surface HNb and the wall surface H1c. In addition, in the liquid jet head 1Z, the wall surface HNc and the wall surface H1a are connected, and the connection surface Hj6 is not provided between the wall surface HNc and the wall surface H1a. That is, in the liquid jet head 1Z according to the reference example, a corner Ed2 is formed at a connection point between the wall surface HCa and the wall surface HRa. In addition, in the liquid jet head 1Z, a corner Ed3 is formed at a connection point between the wall surface HRa and the wall surface HNa. In addition, in the liquid jet head 1Z, a corner Ed4 is formed at a connection point between the wall surface HRb and the wall surface HNb. In addition, in the liquid jet head 1Z, a corner Ed5 is formed at a connection point between the wall surface HNb and the wall surface H1c. In addition, in the liquid jet head 1Z, a corner Ed6 is formed at a connection point between the wall surface HNc and the wall surface H1a.

[0054] As shown in FIG. 8, in the liquid jet head 1Z according to the reference example, a stagnation point St1 where the ink flow stagnates exists near the corner Ed3 on the +X side and the -Z side of the corner Ed3. Also, a stagnation point St2 where the ink flow stagnates exists near the corner Ed4 on the +Z side of the corner Ed4. Air bubbles are likely to remain in the stagnation points St1 and St2. Specifically, the flow FL11 does not bend at a right angle at the corner Ed4 and swells significantly in the +Z direction, causing the stagnation point St2. Also, the flow FL2 does not reach the corner Ed3 and flows in an arc in a region closer to the corner Ed4 than the corner Ed3, causing stagnation near the corner Ed3. When the flow FL1 tries to turn vertically at the corner Ed4, it cannot complete the turn, and some of the ink and pigment P are pulled outward from the flow FL1 due to centrifugal force. As a result, the ink and pigment P that have deviated from the flow FL11 move in the +Z direction, which is the flow direction of the flow FL11 in the communication flow path RR, making it easier for the pigment P to flow into the nozzle N. As a result, the pigment P that has settled to the bottom of the pressure chamber CB is easier to flow into the nozzle N by the ink flow FL1.

[0055] In contrast, in the circulation flow path RJ included in the liquid jet head 1 according to this embodiment, a connection surface Hj3 is provided between the wall surface HRa and the wall surface HNa. Therefore, the flow FL21 flows along the connection surface Hj3, and the stagnation point St1 does not occur. Furthermore, in the circulation flow path RJ according to this embodiment, a connection surface Hj4 is provided between the wall surface HRb and the wall surface HNb. Since the flow FL1 flows along the connection surface Hj4, no stagnation point St2 occurs. Since the flow FL1 flows along the connection surface Hj4, the centrifugal force is small, and it is possible to prevent the pigment P from moving out of the flow FL1 in the +Z direction and flowing into the nozzle N. As a result, as described above, the flow FL1 carrying the pigment P can cross the flow FL2 and reduce the flow of the pigment P into the nozzle N.

[0056] 1-6: Advantages of the First Embodiment The liquid jet head 1 according to this embodiment includes a nozzle N that ejects liquid in the +Z direction, and an individual flow path that communicates with the nozzle N. The individual flow path includes a pressure chamber CB that extends in the -X direction perpendicular to the +Z direction, a first portion that extends in the -X direction, and a second portion that communicates between the pressure chamber CB and an end portion ER of the first portion in the second direction and extends in the +Z direction. The first portion includes a wall surface HNa in which the nozzle N is formed. The second portion includes a wall surface HRa that faces the +X direction opposite to the -X direction. The individual flow path has a connection surface Hj3 that is disposed between the wall surface HRa and the wall surface HNa. The connection surface Hj3 approaches the +X direction as it moves in the +Z direction.

[0057] Therefore, in the liquid jet head 1 according to this embodiment, the presence of the connection surface Hj3 eliminates stagnation of the ink flow compared to the reference example. Specifically, since the flow FL2 flows along the connection surface Hj3, the stagnation point St1 does not occur. As a result, air bubbles are prevented from remaining in the corners of the flow path.

[0058] Furthermore, in the liquid jet head 1 according to this embodiment, the second portion includes a wall surface HRb facing the -X direction. The nozzle N formed on the wall surface HNa is disposed between a position Ej3 of the end of the connection surface Hj3 in the +X direction and a position ERb of the wall surface HRb in the -X direction.

[0059] Therefore, the ink circulating in the liquid jet head 1 flows through the second portion and then flows near the opening NP of the nozzle N, which makes it easier to agitate the ink in the nozzle N and suppresses thickening of the ink, thereby improving the efficiency of ink ejection from the nozzle N.

[0060] In the liquid jet head 1 according to this embodiment, the center position in the -X direction between the wall surface HRb and the end of the connection surface Hj3 in the +X direction is a first center position C1. The nozzle N formed on the wall surface HNa is disposed between the first center position C1 and the position Ej3 of the end of the connection surface Hj3 in the +X direction in the -X direction.

[0061] Therefore, the ink in the nozzle N is more easily stirred, and the ink is prevented from thickening. As a result, the efficiency of ink ejection from the nozzle N is further improved.

[0062] In the liquid jet head 1 according to this embodiment, the center position in the -X direction between the wall surface HRa and the wall surface HRb is a second center position C2. The nozzle N formed on the wall surface HNa is disposed between the second center position C2 and a position Ej3 of the end of the connection surface Hj3 in the +X direction in the -X direction.

[0063] Therefore, the ink in the nozzle N is more easily stirred, and the ink is prevented from thickening. As a result, the efficiency of ink ejection from the nozzle N is further improved.

[0064] Furthermore, in the liquid jet head 1 according to this embodiment, the opening NP of the nozzle N formed in the wall surface HNa is positioned on an extension line of the connection surface Hj3 when viewed in the +Y direction perpendicular to both the +Z direction and the -X direction.

[0065] Therefore, the ink circulating in the liquid jet head 1 flows near the connection surface Hj3 and then near the opening NP of the nozzle N, which makes it easier to agitate the ink in the nozzle N and suppresses thickening of the ink, thereby further increasing the efficiency of ink ejection from the nozzle N.

[0066] In the liquid jet head 1 according to this embodiment, the connection surface Hj3 has a first inclined surface, and the angle between the normal to the first inclined surface and the normal to the wall surface HNa is 30 degrees or more and 60 degrees or less. In this embodiment, since the connection surface Hj3 is the first inclined surface, in other words, the angle between the normal to the connection surface Hj3 and the normal to the wall surface HNa is 30 degrees or more and 60 degrees or less.

[0067] For this reason, by having the connection surface Hj3 have an inclined surface that is inclined at an angle of 30 degrees or more and 60 degrees or less with respect to the wall surface HNa, air bubbles present in the corners of the flow channel are easily discharged.

[0068] In the liquid jet head 1 according to this embodiment, the first portion has a wall surface HNb facing the wall surface HNa. The second portion includes a wall surface HRb facing the -X direction. The individual flow paths have a connection surface Hj4 disposed between the wall surfaces HRb and HNb. The connection surface Hj4 approaches the +X direction as it moves in the +Z direction.

[0069] For this reason, in the liquid jet head 1 according to this embodiment, the presence of the connection surface Hj4 eliminates stagnation of the ink flow compared to the reference example. Because the flow FL1 flows along the connection surface Hj4, the centrifugal force is small, and it is possible to prevent the pigment P from departing from the flow FL1, moving in the +Z direction, and flowing into the nozzle N. Because the flow FL1 flows along the connection surface Hj4, stagnation points St2 do not occur. As a result, air bubbles are prevented from remaining in the corners of the flow path.

[0070] In the liquid jet head 1 according to this embodiment, the connection surface Hj3 has a first inclined surface, and the connection surface Hj4 has a second inclined surface, and the first inclined surface and the second inclined surface are substantially parallel when viewed in the +Y direction perpendicular to both the +Z direction and the -X direction. In this embodiment, the connection surface Hj3 is the first inclined surface, and the connection surface Hj4 is the second inclined surface, in other words, the connection surface Hj3 and the connection surface Hj4 are substantially parallel when viewed in the +Y direction perpendicular to both the +Z direction and the -X direction.

[0071] Therefore, since the first inclined surface and the second inclined surface are substantially parallel to each other, pressure loss at the intersection portion AR is suppressed.

[0072] In the liquid jet head 1 according to this embodiment, the first inclined surface and the second inclined surface overlap in a direction perpendicular to the first inclined surface. In other words, the connection surface Hj3 and the connection surface Hj4 overlap when viewed in a direction along the normal to the connection surface Hj3.

[0073] Therefore, the pressure loss at the intersection portion AR is further suppressed.

[0074] Furthermore, the liquid ejection device 100 according to this embodiment includes a liquid ejection head 1 and a circulation mechanism 94 that circulates liquid between the inside of the liquid ejection head 1 and the outside of the liquid ejection head 1 via individual flow paths.

[0075] Therefore, in the liquid ejecting device 100 according to this embodiment, the presence of the connection surface Hj3 eliminates stagnation of the ink flow when circulating the ink, compared to the reference example.

[0076] 2: Second embodiment Hereinafter, the liquid ejecting apparatus 100A according to this embodiment will be described with reference to FIG.

[0077] A liquid jet apparatus 100A according to this embodiment includes a liquid jet head 1A instead of the liquid jet head 1 included in the liquid jet apparatus 100 according to the first embodiment. The liquid jet head 1A has a different configuration from the liquid jet head 1 at an intersection portion AR.

[0078] 2-1: Configuration near the nozzle Fig. 9 is an enlarged cross-sectional view of the vicinity of the intersection AR. In Fig. 9, the intersection AR is defined by an end ER of the communication flow path RR in the +Z direction, a wall surface HRa, a connection surface Hj3, a wall surface HRaa, a wall surface HNa, an end EN of the nozzle flow path RN in the -X direction, and a connection surface Hj4.

[0079] The wall surface HRaa is a wall surface located in the +X direction and +Z direction with respect to the wall surface HRa, and extends in the Z-axis direction. A connection surface Hj3 is provided between the wall surfaces HRa and HRaa, and extends in the W3 direction when viewed in the Y-axis direction. More specifically, the connection surface Hj3 is provided so as to connect the wall surface HRa and the wall surface HRaa.

[0080] Furthermore, a corner Ed3a is formed at the connection between the wall surface HRaa and the wall surface HNa.

[0081] In the intersection portion AR according to this embodiment, the first center position C1 is the center position between the position ERb of the wall surface HRb in the X-axis direction and the position Ej33 of the wall surface HRaa in the X-axis direction. Moreover, the second center position C2 is the center position between the position ERb of the wall surface HRb in the X-axis direction and the position ERa of the wall surface HRa in the X-axis direction. In the intersection portion AR, the nozzle N is disposed in the +X direction from the first center position C1. In addition, in the intersection portion AR, the nozzle N is disposed in the +X direction from the second center position C2. In addition, in the intersection portion AR, the nozzle N overlaps with the connection surface Hj4 when viewed in the Z-axis direction.

[0082] Furthermore, in a predetermined range of the wall surface HNa centered on the opening of the nozzle N, a groove portion NT is provided around the nozzle N, which is a portion recessed in the +Z direction from the wall surface HNa. In this embodiment, when the flow FL2 flows along the wall surface HNa, it enters the groove portion NT and then flows in the +X direction. Therefore, the flow FL2 can refresh the inside of the opening of the nozzle N.

[0083] Furthermore, the connection surface Hj3 approaches the +X direction as it moves in the +Z direction. Similarly, the connection surface Hj4 approaches the +X direction as it moves in the +Z direction. It is preferable that the connection surface Hj3 and the connection surface Hj4 are approximately parallel to each other.

[0084] In addition, in the -X direction, the center position of the nozzle N in the -X direction is located between both ends of the connection surface Hj4 in the -X direction. In other words, in the -X direction, it is preferable that the center position of the nozzle N in the -X direction is located between the end EN and the position ERb corresponding to the positions of both ends of the connection surface Hj4 in the -X direction.

[0085] 2-2: Advantages of the Second Embodiment The liquid jet head 1 according to this embodiment includes a nozzle N that ejects liquid in the +Z direction, and an individual flow path that communicates with the nozzle N. The individual flow path includes a pressure chamber CB that extends in the -X direction perpendicular to the +Z direction, a first portion that extends in the -X direction, and a second portion that communicates the pressure chamber CB with an end ER of the first portion in the second direction and extends in the +Z direction. The first portion includes a wall surface HNa in which the nozzle N is formed, and a wall surface HNb that faces the wall surface HNa. The second portion includes a wall surface HRb that faces the -X direction. The individual flow path has a connection surface Hj4 that is disposed between the wall surface HRb and the wall surface HNb. The connection surface Hj4 approaches the +X direction as it moves in the +Z direction.

[0086] Therefore, in the liquid jet head 1 according to this embodiment, the presence of the connection surface Hj4 eliminates stagnation of the ink flow compared to the reference example. Specifically, the flow FL1 flows along the connection surface Hj4, so that the stagnation point St2 does not occur. As a result, air bubbles are prevented from remaining in the corners of the flow path.

[0087] In the liquid jet head 1A according to this embodiment, the communication flow path RR, which is the second portion, connects the -X direction end EC of the pressure chamber CB to the -X direction end ER of the first portion. When viewed in the +Z direction, the nozzle N overlaps with the connection surface Hj4.

[0088] For this reason, in the liquid jet head 1A, the pigment P that has settled in the pressure chamber CB flows through the second portion and then passes through the vicinity of the connection surface Hj4. As a result, it is possible to prevent the pigment P from entering the nozzle N that is separated from the connection surface Hj4. Furthermore, by separating the nozzle N in the +Z direction as viewed from the connection surface Hj4, a flow different from the ink flowing near the connection surface Hj4 flows near the nozzle N. For this reason, the ink in the nozzle N is easily agitated, and thickening of the ink is suppressed. This in turn increases the efficiency of ink ejection from the nozzle N.

[0089] 3: Third embodiment Hereinafter, the liquid ejecting apparatus 100B according to this embodiment will be described with reference to FIG.

[0090] The liquid jet device 100B according to this embodiment includes a liquid jet head 1B instead of the liquid jet head 1 included in the liquid jet device 100 according to the first embodiment. The liquid jet head 1B is different from the liquid jet head 1 in the configurations of the intersection portion AR1 and the intersection portion AR2.

[0091] 3-1: Configuration near the nozzle Fig. 10 is an enlarged cross-sectional view of the vicinity of the intersection AR. In Fig. 10, the intersection AR is defined by an end ER of the communication flow path RR in the +Z direction, a wall surface HRa, a connection surface Hj3, a wall surface HRaa, a wall surface HNa, an end EN of the nozzle flow path RN in the -X direction, a wall surface HRd, a wall surface HRc, and a connection surface Hj4a.

[0092] The wall surface HRaa is a wall surface located in the +X direction and +Z direction with respect to the wall surface HRa, and extends in the Z-axis direction. A connection surface Hj3 is provided between the wall surfaces HRa and HRaa, extending in the W3 direction when viewed in the Y-axis direction. More specifically, the connection surface Hj3 is provided so as to connect the wall surfaces HRa and HRaa. In addition, a corner portion Ed3a is formed at the connection portion between the wall surfaces HRaa and HNa.

[0093] The wall surface HRd is a wall surface located in the −Z direction with respect to the wall surface HNa, and extends in the X-axis direction.

[0094] The wall surface HRc is a wall surface located in the -X direction and the +Z direction with respect to the wall surface HRb, and extends in the Z-axis direction. A connection surface Hj4a is provided between the wall surfaces HRc and HRb, and extends in the W4a direction when viewed in the Y-axis direction. More specifically, the connection surface Hj4a is provided so as to connect the wall surfaces HRc and HRb.

[0095] Here, the W4a direction is a direction between the -X direction and the +Z direction when viewed in the Y-axis direction. In this embodiment, the angle θ4aa between the normal direction of the connection surface Hj4a and the normal direction of the wall surface HNa is preferably 30 degrees or more and less than 60 degrees.

[0096] At least a portion of the connection surface Hj3 and at least a portion of the connection surface Hj4a overlap when viewed in the -X direction. In other words, at least a portion of the connection surface Hj3 and at least a portion of the connection surface Hj4a overlap when viewed in the -X direction. Also, the +Z end of the connection surface Hj3 is closer to the wall surface HNa than the +Z end of the connection surface Hj4a.

[0097] At the intersection AR according to the present embodiment, the position of the nozzle N is located in the +X direction from the position ERaa of the wall surface HRaa in the X-axis direction. Also, at the intersection AR, the position of the nozzle N is located in the -X direction from the position ERc of the wall surface HRc in the X-axis direction.

[0098] At the intersection AR, the flow FL1 flows along the wall surface HRb, the connecting surface Hj4a, the wall surface HRc, and the wall surface HRd. The flow FL2 flows along the wall surface HRa, the connecting surface Hj3, the wall surface HRaa, and the wall surface HNa. As a result, the flow FL1 and the flow FL2 are attracted to the vicinity of the opening of the nozzle N. This in turn improves the ink ejection efficiency.

[0099] In this embodiment, the connection surface Hj3 is an example of a "first connection surface." The wall surface HRb is an example of a "second wall surface." The connection surface Hj4a is an example of a "third connection surface." The wall surface HRc is an example of a "third wall surface." The wall surface HNa is an example of a "first surface." The wall surface HRd is an example of a "second surface."

[0100] 3-2: Advantages of the Third Embodiment In the liquid jet head 1B according to this embodiment, the first portion has a wall surface HRd facing the wall surface HNa. The second portion includes a wall surface HRb facing the -X direction. The individual flow paths have a connection surface Hj4a disposed between the wall surfaces HRb and HRd. The connection surface Hj4a approaches the -X direction as it moves in the +Z direction.

[0101] Therefore, the ink circulating in the liquid jet head 1B flows near the connection surfaces Hj3 and Hj4a, and then flows near the openings NP of the nozzles N, which makes it easier to agitate the ink in the nozzles N and suppresses thickening of the ink, thereby improving the efficiency of ink ejection from the nozzles N.

[0102] Furthermore, in the liquid jet head 1B according to this embodiment, at least a portion of the connection surface Hj3 and at least a portion of the connection surface Hj4a overlap when viewed in the -X direction.

[0103] Therefore, the ink flowing near the connection surface Hj3 and the ink flowing near the connection surface Hj4a are attracted to the vicinity of the opening NP of the nozzle N, which makes it easier to agitate the ink in the nozzle N and further suppresses the thickening of the ink. This in turn further increases the efficiency of ink ejection from the nozzle N.

[0104] Furthermore, in the liquid jet head 1B according to this embodiment, the individual flow path has a wall surface HRc that extends in the +Z direction and connects the connection surface Hj4a and the wall surface HRd.

[0105] This ensures the strength of the tip portion of the connection surface Hj4a.

[0106] Furthermore, in the liquid jet head 1B according to this embodiment, the end of the connection surface Hj3 in the +Z direction is closer to the wall surface HNa than the end of the connection surface Hj4a in the +Z direction.

[0107] Therefore, the ink that has flowed near the nozzle N is more likely to flow into the nozzle flow path RN, which is a flow path in which the ink is collected, and further into the flow path R1 and the flow path R2.

[0108] 4: Variation The above-mentioned embodiments can be modified in various ways. Specific examples of the modifications are given below.

[0109] 4-1: Variation 1 In the embodiment described above, both the exhaust port 51 and the supply port 52 are located in the +X direction with respect to the pressure chamber CB. However, one of the exhaust port 51 and the supply port 52 may be located in the +X direction with respect to the pressure chamber CB, and the other may be located in the -X direction with respect to the pressure chamber CB. [Explanation of symbols]

[0110] 1, 1A, 1B, 1Z...liquid ejection head, 2...communication plate, 3...pressure chamber substrate, 4...vibration plate, 5...storage chamber forming substrate, 8...wiring substrate, 21...substrate, 22...substrate, 50...opening, 51...exhaust port, 52...supply port, 53...exhaust port, 54...supply port, 60...nozzle substrate, 61...compliance sheet, 81...drive circuit, 90...control device, 91...transport mechanism, 92...movement mechanism, 93...liquid container, 94...circulation mechanism, 100, 100A, 100B...liquid ejection device, 810...wiring, 9 21...storage case, 922...endless belt, C1...first center position, C2...second center position, CB...pressure chamber, EC, EN, ER...ends, H1a, H1b, H1c, H1d, H2a, H2b, H2c, HCa, HNa, HNb, HNc, HRa, HRaa, HRb, HRc, HRd...wall surfaces, Hj2, Hj3, Hj4, Hj4a, Hj5, Hj6, Hj7, Hj8, Hj9...connection surfaces, N...nozzle, R1, R2...flow path, θ2, θ3, θ4, θ4aa, θ5, θ6...angles

Claims

1. A nozzle that ejects liquid in a first direction; An individual flow path communicating with the nozzle; Equipped with The individual flow paths include A pressure chamber extending in a second direction perpendicular to the first direction; A first portion extending in the second direction; a second portion that communicates with the pressure chamber and an end portion of the first portion in the second direction and extends in the first direction, the first portion includes a first surface in which the nozzle is formed, the second portion includes a first wall surface facing the third direction opposite to the second direction, The individual flow paths each have a first connection surface disposed between the first wall surface and the first surface, the first connection surface approaches the third direction as it moves in the first direction; A liquid jet head comprising:

2. The second portion includes a second wall surface facing the second direction, the nozzle formed on the first surface is disposed in the second direction between an end of the first connection surface in the third direction and the second wall surface; The liquid jet head according to claim 1 .

3. a center position in the second direction between the second wall surface and an end portion in the third direction of the first connection surface is a first center position, the nozzle formed on the first surface is disposed in the second direction between the first center position and an end of the first connection surface in the third direction; The liquid jet head according to claim 2 .

4. a center position between the first wall surface and the second wall surface in the second direction is a second center position; the nozzle formed on the first surface is disposed in the second direction between the second center position and an end of the first connection surface in the third direction; The liquid jet head according to claim 3 .

5. The first connection surface has a first inclined surface, an opening of the nozzle formed on the first surface is disposed on an extension line of the first inclined surface when viewed in a fourth direction perpendicular to both the first direction and the second direction; The liquid jet head according to claim 1 .

6. The first connection surface has a first inclined surface, an angle between a normal line of the first inclined surface and a normal line of the first surface is greater than or equal to 30 degrees and less than or equal to 60 degrees; The liquid jet head according to claim 1 .

7. The first portion has a second surface opposite to the first surface, The second portion includes a second wall surface facing the second direction, The individual flow path has a second connection surface disposed between the second wall surface and the second surface, the second connection surface approaches the third direction as it moves toward the first direction; The liquid jet head according to claim 1 .

8. The first connection surface has a first inclined surface, The second connection surface has a second inclined surface, The first inclined surface and the second inclined surface are substantially parallel to each other when viewed in a fourth direction perpendicular to both the first direction and the second direction. The liquid jet head according to claim 7 .

9. The first inclined surface and the second inclined surface overlap each other in a direction perpendicular to the first inclined surface. The liquid jet head according to claim 8 .

10. the second portion communicates an end of the pressure chamber in the second direction with an end of the first portion in the second direction; When viewed in the first direction, the nozzle overlaps the second connection surface. The liquid jet head according to claim 7 .

11. The first portion has a second surface opposite to the first surface, The second portion includes a second wall surface facing the second direction, The individual flow path has a third connection surface disposed between the second wall surface and the second surface, the third connection surface approaches the second direction as it moves toward the first direction, The liquid jet head according to claim 1 .

12. At least a portion of the first connection surface and at least a portion of the third connection surface overlap when viewed in the second direction. The liquid jet head according to claim 11 .

13. The individual flow paths each have a third wall surface that connects the third connection surface and the second surface and extends in the first direction. The liquid jet head according to claim 11 .

14. an end portion of the first connection surface in the first direction is closer to the first surface than an end portion of the third connection surface in the first direction; The liquid jet head according to claim 11 .

15. A nozzle that ejects liquid in a first direction; An individual flow path communicating with the nozzle; Equipped with The individual flow paths include A pressure chamber extending in a second direction perpendicular to the first direction; A first portion extending in the second direction; a second portion that communicates with the pressure chamber and an end portion of the first portion in the second direction and extends in the first direction, the first portion includes a first surface in which the nozzle is formed and a second surface opposed to the first surface, The second portion includes a second wall surface facing the second direction, The individual flow path has a second connection surface disposed between the second wall surface and the second surface, the second connection surface approaches a third direction opposite to the second direction as it advances in the first direction; A liquid jet head comprising:

16. the second portion communicates an end of the pressure chamber in the second direction with an end of the first portion in the second direction; When viewed in the first direction, the nozzle overlaps the second connection surface. The liquid jet head according to claim 15 .

17. In the second direction, a center position of the nozzle in the second direction is located between both ends of the second connection surface in the second direction. The liquid jet head according to claim 16 .

18. A liquid jet head according to any one of claims 1 to 17, a circulation mechanism that circulates liquid between an inside of the liquid jet head and an outside of the liquid jet head via the individual flow paths; A liquid ejection apparatus comprising:

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