Liquid ejection head and liquid ejection device

Abstract

The present invention provides a liquid ejection head and a liquid ejection device that improve ejection performance. The liquid ejection head comprises: a pressure chamber substrate provided with a first pressure chamber and a second pressure chamber adjacent to the first pressure chamber in a first direction; a connecting plate provided with a first connecting channel communicating with the first pressure chamber and the second pressure chamber, and a first common liquid chamber communicating with the first pressure chamber and the second pressure chamber at a position different from the first connecting channel; a nozzle substrate provided with a first nozzle communicating with the first pressure chamber and the second pressure chamber via the first connecting channel, and a second connecting channel provided on the pressure chamber substrate or the connecting plate, the second connecting channel communicating with the first common liquid chamber and with the first pressure chamber and the second pressure chamber.

Description

Technical Field

[0001] The present invention relates to a liquid ejecting head and a liquid ejecting device. Background Art

[0002] Generally, a liquid ejection head provided in a liquid ejection device such as a piezoelectric inkjet printer includes a nozzle, a pressure chamber communicating with the nozzle, and a piezoelectric element for changing the pressure in the pressure chamber.

[0003] In order to cope with the increase in ink viscosity or the discharge of liquid with a large particle size, for example, a device is known as described in Patent Document 1, which discharges liquid from a plurality of pressure chambers through a single nozzle.

[0004] In the device described in Patent Document 1, two pressure chambers arranged side by side in a direction intersecting the direction of nozzle arrangement are connected to a single nozzle. Alternatively, a configuration in which two pressure chambers arranged side by side in the direction of nozzle arrangement are connected to a single nozzle is conceivable. This configuration has the advantage of requiring only a single shared liquid chamber for supplying liquid to the two pressure chambers. However, if this configuration is employed in its entirety, the pressure in each pressure chamber easily escapes into the shared liquid chamber, leaving room for improvement in ejection performance.

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2018-103418 Summary of the Invention

[0006] In order to solve the above problems, one method of the liquid ejection head involved in the present invention includes: a pressure chamber substrate, which is provided with a first pressure chamber and a second pressure chamber adjacent to the first pressure chamber in a first direction relative to the first pressure chamber; a connecting plate, which is provided with a first connecting channel connected to the first pressure chamber and the second pressure chamber and a first common liquid chamber connected to the first pressure chamber and the second pressure chamber at a position different from the first connecting channel; a nozzle substrate, which is provided with a first nozzle connected to the first pressure chamber and the second pressure chamber via the first connecting channel, and a second connecting channel is provided on the pressure chamber substrate or the connecting plate, and the second connecting channel is connected to the first common liquid chamber and is connected to the first pressure chamber and the second pressure chamber.

[0007] One embodiment of a liquid ejection device according to the present invention includes: the liquid ejection head of the above embodiment; and a control unit that controls the ejection operation of the liquid in the liquid ejection head. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a diagram schematically showing the structure of the liquid ejecting device according to the first embodiment.

[0009] Figure 2 It is an explanatory diagram of a liquid flow path in the liquid ejection device according to the first embodiment.

[0010] Figure 3 It is a cross-sectional view of the liquid ejecting head according to the first embodiment.

[0011] Figure 4 To schematically represent Figure 3 A plan view of the flow path of the liquid ejection head is shown.

[0012] Figure 5 for Figure 4 BB line section view in.

[0013] Figure 6 It is a cross-sectional view of a liquid ejecting head according to a second embodiment.

[0014] Figure 7 It is a cross-sectional view of a liquid ejecting head according to a third embodiment.

[0015] Figure 8 To schematically represent Figure 7 A plan view of the flow path of the liquid ejection head is shown.

[0016] Figure 9 It is a cross-sectional view of a liquid ejecting head according to a fourth embodiment.

[0017] Figure 10 To schematically represent Figure 9 A plan view of the flow path of the liquid ejection head is shown.

[0018] Figure 11 It is a plan view schematically showing a flow path of a liquid ejecting head according to a fifth embodiment.

[0019] Figure 12 It is an explanatory diagram of a liquid flow path in a liquid ejection device according to a sixth embodiment. DETAILED DESCRIPTION

[0020] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the accompanying drawings, the dimensions and scales of various components may differ from actual dimensions, and some components are schematically illustrated for ease of understanding. The scope of the present invention is not limited to these embodiments unless otherwise specified in the following description.

[0021] In addition, for the sake of convenience, the following description is appropriately carried out using the X-axis, Y-axis, and Z-axis that intersect with each other. In addition, in the following description, a direction along the X-axis is the X1 direction, and the direction opposite to the X1 direction is the X2 direction. Similarly, directions along the Y-axis and opposite to each other are the Y1 direction and the Y2 direction. In addition, directions along the Z-axis and opposite to each other are the Z1 direction and the Z2 direction. The Y1 direction or the Y2 direction is an example of a "first direction". The X1 direction or the X2 direction is an example of a "second direction". The Z1 direction or the Z2 direction is an example of a "third direction". In addition, there is a case where observation in the direction along the Z-axis is referred to as "planar observation".

[0022] Typically, the Z axis is a vertical axis, and the Z2 direction corresponds to the downward direction of the vertical direction. However, the Z axis does not have to be a vertical axis. Furthermore, while the X axis, Y axis, and Z axis are typically orthogonal to each other, this is not limiting. For example, they may intersect at an angle within a range of 80° to 100°.

[0023] 1. Implementation Method

[0024] 1-1. Overall structure of the liquid ejection device

[0025] Figure 1 This is a schematic diagram illustrating the structure of a liquid ejection device 100 according to the first embodiment. The liquid ejection device 100 is an inkjet printing device that ejects ink, an example of liquid, as droplets onto a medium M. The medium M is typically printing paper. However, the medium M is not limited to printing paper and may be any material to be printed on, such as a resin film or fabric.

[0026] like Figure 1 As shown, a liquid container 10 for storing ink is installed in a liquid ejecting device 100. Specific examples of the liquid container 10 include an ink cartridge that can be attached to and detached from the liquid ejecting device 100, a bag-shaped ink bag formed of a flexible film, and an ink tank for refilling the ink. The type of ink stored in the liquid container 10 is arbitrary.

[0027] The liquid ejection device 100 includes a control unit 20 , a transport mechanism 30 , a movement mechanism 40 , a liquid ejection head 50 , and a circulation mechanism 60 .

[0028] The control unit 20 includes a processing circuit such as a CPU (Central Processing Unit) or an FPGA (Field Programmable Gate Array) and a storage circuit such as a semiconductor memory, and controls the operation of each component of the liquid ejection device 100. The control unit 20 is an example of a "control unit" and controls the ejection of ink from the liquid ejection head 50. A single control unit 20 may be provided, or multiple control units may be provided.

[0029] The transport mechanism 30 transports the medium M in the Y2 direction under the control of the control unit 20. The moving mechanism 40 reciprocates the liquid ejecting head 50 in the X1 direction and the X2 direction under the control of the control unit 20. Figure 1 In the illustrated example, the moving mechanism 40 includes a generally box-shaped transport body 41, called a carriage, which houses the liquid ejecting head 50, and a conveyor belt 42 that secures the transport body 41. The number of liquid ejecting heads 50 mounted on the transport body 41 is not limited to one; multiple liquid ejecting heads 50 may be mounted. Furthermore, in addition to the liquid ejecting heads 50, the transport body 41 may also carry the aforementioned liquid container 10.

[0030] Under the control of the control unit 20 , the liquid ejection head 50 ejects ink supplied from the liquid container 10 via the circulation mechanism 60 from a plurality of nozzles N in the Z2 direction toward the medium M. This ejection is performed in parallel with the transport of the medium M by the transport mechanism 30 and the reciprocating movement of the liquid ejection head 50 by the movement mechanism 40 , thereby forming an image formed by the ink on the surface of the medium M.

[0031] The circulation mechanism 60 is a mechanism that supplies ink to the liquid ejection head 50 and recovers the ink discharged from the liquid ejection head 50 for resupply to the liquid ejection head 50. The operation of the circulation mechanism 60 can suppress the increase in ink viscosity or reduce the retention of bubbles in the ink. Figure 2 To explain.

[0032] 1-2. Flow path of liquid ejection device

[0033] Figure 2 FIG1 is an explanatory diagram of the flow path of the liquid in the liquid ejection device 100 according to the first embodiment. Figure 2 As shown, the liquid ejection head 50 is provided with a plurality of nozzles N, a plurality of independent flow channels P, a first common liquid chamber R1 and a second common liquid chamber R2 , and is connected to a circulation mechanism 60 .

[0034] The plurality of nozzles N are arranged along the Y axis, and a collection of the plurality of nozzles N constitutes a nozzle row L. Each of the plurality of nozzles N communicates with an independent flow path P.

[0035] A plurality of independent flow passages P are provided for each nozzle N. Each independent flow passage P includes four pressure chambers C, a nozzle flow passage Nf, a communication passage Na1 as an example of a "first communication passage", a communication passage Na2 as an example of a "fourth communication passage", a communication passage Ra1 as an example of a "second communication passage", and a communication passage Ra2 as an example of a "third communication passage".

[0036] The multiple pressure chambers C in the multiple independent flow channels P are divided into multiple pressure chambers C belonging to a column L1 arranged along the Y axis and multiple pressure chambers belonging to a column L2 arranged along the Y axis at a position different from the column L1 in the X1 direction or the X2 direction.

[0037] Here, the four pressure chambers C included in each independent flow path P are composed of two adjacent pressure chambers C among the plurality of pressure chambers C belonging to the row L1 and two adjacent pressure chambers C among the plurality of pressure chambers C belonging to the row L2.

[0038] Furthermore, one of the two pressure chambers C belonging to row L1 in each independent flow channel P corresponds to the first pressure chamber C_1, described later, and the other pressure chamber C corresponds to the second pressure chamber C_2, described later. One of the two pressure chambers C belonging to row L2 in each independent flow channel P corresponds to the third pressure chamber C_3, described later, and the other pressure chamber C corresponds to the fourth pressure chamber C_4, described later.

[0039] However, it can also be said that of the two pressure chambers C in row L1 of each independent flow channel P, one pressure chamber C adjacent to the second pressure chamber of the other independent flow channel P corresponds to the fifth pressure chamber C_5, described later, and the other pressure chamber C corresponds to the sixth pressure chamber C_6, described later. Furthermore, it can also be said that of the two pressure chambers C in row L2 of each independent flow channel P, one pressure chamber C adjacent to the second pressure chamber of the other independent flow channel P corresponds to the seventh pressure chamber C_7, described later, and the other pressure chamber C corresponds to the eighth pressure chamber C_8, described later.

[0040] The two pressure chambers C in row L1 and the two pressure chambers C in row L2 of each independent flow channel P are connected via the nozzle flow channel Nf, the communication channel Na1, and the communication channel Na2. The communication channel Na1 is interposed between the two pressure chambers C in row L1 and the nozzle flow channel Nf. On the other hand, the communication channel Na2 is interposed between the two pressure chambers C in row L2 and the nozzle flow channel Nf. A nozzle N is provided in each nozzle flow channel Nf. In each nozzle flow channel Nf, ink is ejected from the nozzle N by varying the pressure in the two pressure chambers C in row L1 and the two pressure chambers C in row L2.

[0041] Multiple independent flow channels P are connected to a first common liquid chamber R1 and a second common liquid chamber R2, respectively. The first common liquid chamber R1 is connected to the X1-direction end of each independent flow channel P and communicates with the two pressure chambers C in the column L1 via a communication channel Ra1 within each independent flow channel P. Ink is stored in the first common liquid chamber R1 for supply to each independent flow channel P. Meanwhile, the second common liquid chamber R2 is connected to the X2-direction end of each independent flow channel P and communicates with the two pressure chambers C in the column L2 via a communication channel Ra2 within each independent flow channel P. Ink discharged from each independent flow channel P without being ejected is stored in the second common liquid chamber R2.

[0042] The first common liquid chamber R1 and the second common liquid chamber R2 are connected to a circulation mechanism 60. The circulation mechanism 60 supplies ink to the first common liquid chamber R1 and recovers ink discharged from the second common liquid chamber R2 for redistribution to the first common liquid chamber R1. The circulation mechanism 60 includes a first supply pump 61, a second supply pump 62, a storage tank 63, a recovery flow path 64, and a supply flow path 65.

[0043] The first supply pump 61 is a pump that supplies ink stored in the liquid container 10 to the storage container 63. The storage container 63 is a sub-tank that temporarily stores the ink supplied from the liquid container 10. The recovery channel 64 is a channel interposed between the second common liquid chamber R2 and the storage container 63 and used to recover ink from the second common liquid chamber R2 into the storage container 63. In addition to supplying ink stored in the liquid container 10 from the first supply pump 61 to the storage container 63, ink discharged from each independent flow channel P into the second common liquid chamber R2 is also supplied to the storage container 63 via the recovery channel 64. The second supply pump 62 is a pump that delivers ink stored in the storage container 63. The supply channel 65 is a channel interposed between the first common liquid chamber R1 and the storage container 63 and used to supply ink from the storage container 63 to the first common liquid chamber R1.

[0044] 1-3. Overall structure of the liquid ejection head

[0045] Figure 3FIG. 1 is a cross-sectional view of the liquid ejecting head 50 according to the first embodiment. Figure 3 In the Figure 2 AA line section view. Figure 3 As shown, the liquid ejection head 50 has: a nozzle substrate 51, a connecting plate 52, a pressure chamber substrate 53, a vibration plate 54, a vibration absorber 551 and a vibration absorber 552, multiple piezoelectric elements 56, a shell part 57, a sealing body 58, a wiring substrate 59 and a driving circuit 70.

[0046] Here, in an area located closer to the Z1 direction than the connecting plate 52, a pressure chamber substrate 53, a vibration plate 54, a plurality of piezoelectric elements 56, a shell portion 57, and a sealing body 58 are provided. On the other hand, in an area located closer to the Z2 direction than the connecting plate 52, a nozzle substrate 51, a vibration absorber 551, and a vibration absorber 552 are provided. The nozzle substrate 51, the connecting plate 52, the pressure chamber substrate 53, and the vibration plate 54 of the structural elements of such a liquid ejection head 50 are laminated in this order toward the Z1 direction, and the above-mentioned first common liquid chamber R1, the second common liquid chamber R2, the plurality of independent flow channels P, and the plurality of nozzles N are provided in the structure formed by the lamination. In addition, each of these structural elements is schematically a plate-like component that is elongated in the Y direction and is bonded to each other by, for example, an adhesive.

[0047] A plurality of nozzles N are provided on the nozzle substrate 51. Each of the plurality of nozzles N is a through-hole extending through the nozzle substrate 51 and passing ink therethrough. The nozzle substrate 51 is manufactured, for example, by processing a single crystal silicon substrate using semiconductor processing technology. As the single crystal silicon substrate, for example, a (100) single crystal silicon substrate is preferably used.

[0048] The connecting plate 52 is provided with a portion of each of the first common liquid chamber R1 and the second common liquid chamber R2, and portions of the plurality of independent flow passages P excluding the pressure chambers C. Specifically, the nozzle flow passage Nf, the connecting passage Na1, the connecting passage Na2, the connecting passage Ra1, and the connecting passage Ra2, which constitute the independent flow passages P, are provided on the connecting plate 52.

[0049] The first common liquid chamber R1 and the second common liquid chamber R2 each have a portion that penetrates the communicating plate 52. Vibration absorbers 551 and 552 are provided on the surface of the communicating plate 52 facing the Z2 direction to block the opening formed by the space.

[0050] The vibration absorber 551 and the vibration absorber 552 are each layered members made of an elastic material. The vibration absorber 551 forms a portion of the wall surface of the first common liquid chamber R1 and absorbs pressure fluctuations within the first common liquid chamber R1. Similarly, the vibration absorber 552 forms a portion of the wall surface of the second common liquid chamber R2 and absorbs pressure fluctuations within the second common liquid chamber R2.

[0051] The nozzle flow channel Nf is a space provided in a groove on the surface of the connecting plate 52 facing the Z2 direction. Here, the nozzle substrate 51 constitutes a part of the wall surface of the nozzle flow channel Nf. The connecting channel Na1, the connecting channel Na2, the connecting channel Ra1 and the connecting channel Ra2 are respectively spaces that pass through the connecting plate 52 and are open in each direction of the Z1 direction and the Z2 direction. The above connecting plate 52 is manufactured, for example, by processing a single crystal silicon substrate using semiconductor processing technology. As the single crystal silicon substrate, for example, a (110) single crystal silicon substrate is preferably used. In addition, based on the Figure 4 as well as Figure 5 The nozzle flow path Nf, the communication passage Na1 , the communication passage Na2 , the communication passage Ra1 , and the communication passage Ra2 will be described in detail.

[0052] A plurality of pressure chambers C with independent flow channels P are provided on the pressure chamber substrate 53. Each pressure chamber C penetrates the pressure chamber substrate 53 and is formed in the gap between the connecting plate 52 and the vibration plate 54. The pressure chamber substrate 53 is manufactured, for example, by processing a single crystal silicon substrate using semiconductor processing technology. As the single crystal silicon substrate, a (110) single crystal silicon substrate is preferably used, for example.

[0053] The vibration plate 54 is a plate-shaped component that can vibrate elastically. The vibration plate 54 is, for example, a laminate including a first layer composed of silicon dioxide (SiO2) and a second layer composed of zirconium dioxide (ZrO2). Here, other layers such as metal oxides may be present between the first layer and the second layer. In addition, a part or all of the vibration plate 54 may also be integrally formed with the same material as the pressure chamber substrate 53. For example, by selectively removing a part in the thickness direction of the area corresponding to the pressure chamber C in a plate-shaped component of a predetermined thickness, the vibration plate 54 and the pressure chamber substrate 53 can be formed integrally. In addition, the vibration plate 54 may also be composed of a layer of a single material.

[0054] A plurality of piezoelectric elements 56 are provided on the surface of the vibration plate 54 facing the Z1 direction, corresponding to each pressure chamber C. Each piezoelectric element 56 is constituted by, for example, laminating a first electrode and a second electrode facing each other and a piezoelectric layer disposed between the two electrodes. Each piezoelectric element 56 causes the ink in the pressure chamber C to be ejected from the nozzle N by changing the pressure of the ink in the pressure chamber C. The piezoelectric element 56 vibrates the vibration plate 54 as it deforms due to the drive signal supplied from the drive circuit 70. The pressure of the ink in the pressure chamber C changes due to the expansion or contraction of the pressure chamber C caused by the vibration. In addition, in each independent flow channel P, the piezoelectric element 56 may also be provided to be shared by two pressure chambers C in column L1 or column L2.

[0055] The housing portion 57 is a housing for storing ink. The housing portion 57 is provided with a space for each of the first common liquid chamber R1 and the second common liquid chamber R2, excluding the portion provided on the connecting plate 52. Furthermore, the housing portion 57 is provided with a hole 571 and a hole 572. The hole 571 is a pipe communicating with the first common liquid chamber R1 and is connected to the supply flow channel 65 of the circulation mechanism 60. Therefore, the ink delivered from the second supply pump 62 to the supply flow channel 65 is supplied to the first common liquid chamber R1 via the hole 571. On the other hand, the hole 572 is a pipe communicating with the second common liquid chamber R2 and is connected to the recovery flow channel 64 of the circulation mechanism 60. Therefore, the ink in the second common liquid chamber R2 is discharged into the recovery flow channel 64 via the hole 572.

[0056] The sealing body 58 is a structure that protects the plurality of piezoelectric elements 56 and reinforces the mechanical strength of the pressure chamber substrate 53 and the vibration plate 54. The sealing body 58 is bonded to the surface of the vibration plate 54 using, for example, an adhesive. The sealing body 58 is provided with a recessed portion for accommodating the plurality of piezoelectric elements 56.

[0057] A wiring substrate 59 is bonded to the surface of the vibration plate 54 facing the Z1 direction. The wiring substrate 59 is a mounting component that forms a plurality of wirings for electrically connecting the control unit 20 and the liquid ejection head 50. For example, the wiring substrate 59 is a flexible wiring substrate such as an FPC (Flexible Printed Circuit) or an FFC (Flexible Flat Cable). A drive circuit 70 for driving the piezoelectric elements 56 is mounted on the wiring substrate 59. The drive circuit 70 supplies a drive signal to each piezoelectric element 56.

[0058] In the liquid ejection head 50 having the above structure, the operation of the circulation mechanism 60 causes ink to flow sequentially through the first common liquid chamber R1, the communication channel Ra1, the pressure chambers C in row L1, the communication channel Na1, the nozzle flow path Nf, the communication channel Na2, the pressure chambers C in row L2, the communication channel Ra2, and the second common liquid chamber R2. The operation period and timing of the circulation mechanism 60 are arbitrary, and whether or not they overlap with the period or timing of ink ejection from the nozzles N is also arbitrary.

[0059] Furthermore, in each independent flow channel P, by simultaneously driving the piezoelectric elements 56 corresponding to the two pressure chambers C in the column L1 and the two pressure chambers C in the column L2, the pressures in these pressure chambers C fluctuate, and the ink is ejected from the nozzles N in accordance with the pressure fluctuations. Figure 3 In FIG, the path and direction of the flow of the ink at this time are shown by the dotted line and arrow marks.

[0060] 1-4. Flow path of liquid ejection head

[0061] Figure 4 To schematically represent Figure 3 A plan view of the flow path of the liquid ejection head 50 is shown. Figure 5 for Figure 4 The BB line section view in Figure 4 , the arrangement of the pressure chamber C, nozzle flow channel Nf, communication channel Na1, communication channel Na2, communication channel Ra1, communication channel Ra2, first common liquid chamber R1, and second common liquid chamber R2 when the pressure chamber substrate 53 is viewed in the Z2 direction is shown. Figure 4 For ease of explanation, the shapes of the various parts of the flow channel are schematically shown, but in reality, for example, when the flow channel is formed by processing a single crystal silicon substrate using anisotropic etching, the wall surface along the crystal surface of the single crystal silicon substrate is appropriately arranged in the flow channel.

[0062] exist Figure 4 In FIG, a first nozzle N_1 and a second nozzle N_2 are shown as two nozzles N adjacent to each other in the Y1 direction or the Y2 direction. Figure 4 In FIG, as the nozzle flow channel Nf corresponding to the first nozzle N_1, the first nozzle flow channel Nf_1 is shown, and as the four pressure chambers C corresponding to the first nozzle N_1, the first pressure chamber C_1, the second pressure chamber C_2, the third pressure chamber C_3, and the fourth pressure chamber C_4 are shown. Figure 4, the second nozzle flow channel Nf_2 is shown as the nozzle flow channel Nf corresponding to the second nozzle N_2, and the fifth pressure chamber C_5, the sixth pressure chamber C_6, the seventh pressure chamber C_7 and the eighth pressure chamber C_8 are shown as the four pressure chambers C corresponding to the second nozzle N_2.

[0063] like Figure 4 As shown, the first pressure chamber C_1, the second pressure chamber C_2, the fifth pressure chamber C_5, and the sixth pressure chamber C_6 are arranged in this order along the Y2 direction. Here, the first pressure chamber C_1 and the second pressure chamber C_2 are adjacent to each other along the Y1 direction or the Y2 direction. The second pressure chamber C_2 and the fifth pressure chamber C_5 are adjacent to each other along the Y1 direction or the Y2 direction. The fifth pressure chamber C_5 and the sixth pressure chamber C_6 are adjacent to each other along the Y1 direction or the Y2 direction.

[0064] Similarly, the third pressure chamber C_3, the fourth pressure chamber C_4, the seventh pressure chamber C_7, and the eighth pressure chamber C_8 are arranged in this order along the Y2 direction. The third pressure chamber C_3 is located in the X2 direction relative to the first pressure chamber C_1, and the first pressure chamber C_1 and the third pressure chamber C_3 are arranged along the X1 direction or the X2 direction. Similarly, the second pressure chamber C_2 and the fourth pressure chamber C_4 are arranged along the X1 direction or the X2 direction. The fifth pressure chamber C_5 and the seventh pressure chamber C_7 are arranged along the X1 direction or the X2 direction. The sixth pressure chamber C_6 and the eighth pressure chamber C_8 are arranged along the X1 direction or the X2 direction.

[0065] The communication channel Na1 has a first portion Na11 and a second portion Na12. These portions are each formed by a hole independently penetrating the communication plate 52. Thus, for each nozzle N, the communication channel Na1 is formed by two flow paths.

[0066] Here, in the communication channel Na1 corresponding to the first nozzle N_1, the first portion Na11 is interposed between the first pressure chamber C_1 and the first nozzle flow channel Nf_1, and the second portion Na12 is interposed between the second pressure chamber C_2 and the first nozzle flow channel Nf_1. Similarly, in the communication channel Na1 corresponding to the second nozzle N_2, the first portion Na11 is interposed between the fifth pressure chamber C_5 and the second nozzle flow channel Nf_2, and the second portion Na12 is interposed between the sixth pressure chamber C_6 and the second nozzle flow channel Nf_2.

[0067] On the other hand, the communication channel Na2 has a first portion Na21 and a second portion Na22. These portions are each formed by a hole independently penetrating the communication plate 52. Thus, for each nozzle N, the communication channel Na2 is formed by two holes penetrating the communication plate 52.

[0068] Here, in the communication channel Na2 corresponding to the first nozzle N_1, the first portion Na21 is interposed between the third pressure chamber C_3 and the first nozzle flow channel Nf_1, and the second portion Na22 is interposed between the fourth pressure chamber C_4 and the first nozzle flow channel Nf_1. Similarly, in the communication channel Na2 corresponding to the second nozzle N_2, the first portion Na21 is interposed between the seventh pressure chamber C_7 and the second nozzle flow channel Nf_2, and the second portion Na22 is interposed between the eighth pressure chamber C_8 and the second nozzle flow channel Nf_2.

[0069] On the other hand, each of the communication passages Ra1 and Ra2 is different from each of the communication passages Na1 and Na2 in that each of the communication passages Ra1 and Ra2 is constituted by one hole penetrating the communication plate 52 for each nozzle N.

[0070] Here, the communication channel Ra1 corresponding to the first nozzle N_1 is provided as a shared channel between the first and second pressure chambers C_1 and C_2, and is located between the first and second pressure chambers C_1 and C_2 and the first common liquid chamber R1. Therefore, the communication channel Ra1 corresponding to the first nozzle N_1 opens into each of the first and second pressure chambers C_1 and C_2, and also opens into the first common liquid chamber R1.

[0071] Similarly, the communication channel Ra1 corresponding to the second nozzle N_2 is provided as a shared channel between the fifth and sixth pressure chambers C_5 and C_6, and is located between the fifth and sixth pressure chambers C_5 and C_6 and the first common liquid chamber R1. Therefore, the communication channel Ra1 corresponding to the second nozzle N_2 opens toward each of the fifth and sixth pressure chambers C_5 and C_6, and toward the first common liquid chamber R1.

[0072] In order to effectively transmit the pressure from the pressure chamber C of the column L1 to the nozzle N, the connecting channel Ra1 as described above is constructed so that the pressure is difficult to escape compared to the connecting channel Na1. Specifically, for example, the flow resistance of the connecting channel Ra1 is higher than the flow resistance of the connecting channel Na1. From this point of view, when the total value of the cross-sectional area of ​​the connecting channel Ra1 at the opening to the first pressure chamber C_1 and the second pressure chamber C_2 is set to A, the cross-sectional area of ​​the first part Na11 at the opening to the first pressure chamber C_1 is set to B, and the cross-sectional area of ​​the second part Na12 at the opening to the second pressure chamber C_2 is set to C, it is preferable that the relationship A<B+C is satisfied. In addition, in Figure 4 In the example shown, A is (W2X×W2Y×2), and B and C are (W1X×W1Y), respectively.

[0073] Furthermore, in practice, it is preferable to consider the efficiency of the pressure from the pressure chamber C not only when comparing the opening of the communication channel Ra1 with the opening of the communication channel Na1, but also when comparing the entire area of ​​the communication channel Ra1 extending in the Z direction with the entire area of ​​the communication channel Na1 extending in the Z direction. Generally speaking, the longer the flow channel and the smaller the cross-sectional area, the greater the flow resistance. On the other hand, since both the communication channel Ra1 and the communication channel Na1 are provided so as to penetrate the communication plate 52, their lengths cannot be significantly different. Therefore, when the average cross-sectional area of ​​the communication channel Ra1 is set to D, the average cross-sectional area of ​​the first portion Na11 of the communication channel Na1 is set to E, and the average cross-sectional area of ​​the second portion Na12 of the communication channel Na1 is set to F, it is more preferable to satisfy the relationship D < E + F.

[0074] On the other hand, the communication channel Ra2 corresponding to the first nozzle N_1 is provided as a shared channel between the third and fourth pressure chambers C_3 and C_4, and is located between the third and fourth pressure chambers C_3 and C_4 and the second common liquid chamber R2. Therefore, the communication channel Ra2 corresponding to the first nozzle N_1 opens into each of the third and fourth pressure chambers C_3 and C_4, and into the second common liquid chamber R2.

[0075] Similarly, the communication channel Ra2 corresponding to the second nozzle N_2 is provided as a common channel between the seventh and eighth pressure chambers C_7 and C_8, and is located between the seventh and eighth pressure chambers C_7 and C_8 and the second common liquid chamber R2. Therefore, the communication channel Ra2 corresponding to the second nozzle N_2 opens toward each of the seventh and eighth pressure chambers C_7 and C_8, and toward the second common liquid chamber R2.

[0076] In order to effectively transmit the pressure from the pressure chambers C of the row L2 to the nozzles N, the communication passage Ra2 is configured to prevent the pressure from escaping more easily than the communication passage Na2, similar to the communication passage Ra1.

[0077] As described above, the liquid ejection head 50 includes a pressure chamber substrate 53, a connecting plate 52, and a nozzle substrate 51. As described above, the pressure chamber substrate 53 includes a first pressure chamber C_1 and a second pressure chamber C_2 adjacent to the first pressure chamber C_1 in the Y2 direction, which is an example of a "first direction." The connecting plate 52 includes a connecting channel Na1, an example of a "first connecting channel" connecting the first and second pressure chambers C_1 and C_2, and a first common liquid chamber R1, which connects to the first and second pressure chambers C_1 and C_2 at a different location from the connecting channel Na1. The nozzle substrate 51 includes a first nozzle N_1, which connects to both the first and second pressure chambers C_1 and C_2 via the connecting channel Na1.

[0078] On this basis, a communication channel Ra1 as an example of a “second communication channel” is provided on the communication plate 52 . The communication channel Ra1 communicates with the first common liquid chamber R1 and communicates with both the first pressure chamber C_1 and the second pressure chamber C_2 .

[0079] In the above-described liquid ejection head 50, since the first and second pressure chambers C_1 and C_2 communicate with the first common liquid chamber R1 via a common communication channel Ra1, the flow resistance of the communication channel Ra1 can be made higher than the flow resistance of the communication channel Na1, compared to a structure in which the first and second pressure chambers C_1 and C_2 each communicate with the first common liquid chamber R1 via independent communication channels. Consequently, the degradation of ejection performance caused by the pressure of the first and second pressure chambers C_1 and C_2 escaping into the first common liquid chamber R1 can be reduced. In other words, the pressure of the first and second pressure chambers C_1 and C_2 can be effectively used to eject ink from the first nozzle N_1, resulting in improved ejection performance compared to the conventional technology.

[0080] In contrast, in a structure where the first pressure chamber C_1 and the second pressure chamber C_2 each communicate with the first common liquid chamber R1 via independent communication channels, increasing the flow resistance of these independent communication channels requires forming a communication plate through extremely fine processing. In particular, with the recent trend toward narrower nozzle pitches, these independent communication channels have required further miniaturization, making their formation more difficult.

[0081] In this embodiment, as described above, the communication channel Ra1 is not provided on the pressure chamber base plate 53 but on the communication plate 52. Therefore, compared to a configuration in which at least a portion of the communication channel Ra1 is provided on the pressure chamber base plate 53, the structure of the pressure chamber base plate 53 can be simplified. As a result, the degree of freedom in the design of the pressure chamber base plate 53 can be increased.

[0082] Furthermore, as described above, the first pressure chamber C_1 and the second pressure chamber C_2 each extend along the X1 direction or the X2 direction, which is an example of a "second direction intersecting the first direction." The communication channel Na1 extends along the Z1 direction or the Z2 direction, which is an example of a "third direction intersecting the first and second directions." Therefore, compared to a configuration in which the communication channel Na1 extends along the same plane as the first and second pressure chambers C_1 and C_2, pressure can be more efficiently transmitted from each of the first and second pressure chambers C_1 and C_2 to the first nozzle N_1 via the communication channel Na1.

[0083] As described above, the communication channel Na1 includes a first portion Na11 and a second portion Na12. The first portion Na11 is located between the first pressure chamber C_1 and the first nozzle N_1. The second portion Na12 is located between the second pressure chamber C_2 and the first nozzle N_1 at a position separated from the first portion Na11. This communication channel Na1 allows for more efficient pressure transfer from the first and second pressure chambers C_1 and C_2 to the first nozzle N_1, respectively, via the communication channel Na1, compared to a single flow path shared by the first and second pressure chambers C_1 and C_2.

[0084] Furthermore, as described above, the connecting plate 52 is further provided with the first nozzle flow channel Nf_1, which has a portion interposed between the first portion Na11 and the second portion Na12 and the first nozzle N_1. Therefore, compared to a configuration in which the first nozzle flow channel Nf_1 is provided solely on the nozzle substrate 51, the liquid ejection head 50 can be miniaturized while increasing the cross-sectional area of ​​the first nozzle flow channel Nf_1.

[0085] Furthermore, as described above, the first nozzle flow channel Nf_1 extends in a direction intersecting the Y2 direction. Therefore, the first nozzle flow channel Nf_1 can be provided along the nozzle substrate 51.

[0086] Furthermore, as described above, when the total cross-sectional area of ​​the communication channel Ra1 at its opening to the first pressure chamber C_1 and the second pressure chamber C_2 is represented by A, the cross-sectional area of ​​the first portion Na11 at its opening to the first pressure chamber C_1 is represented by B, and the cross-sectional area of ​​the second portion Na12 at its opening to the second pressure chamber C_2 is represented by C, it is preferable to satisfy the relationship A<B+C. When this relationship is satisfied, the flow resistance of the communication channel Ra1 can be made greater than that of the communication channel Na1, even if the lengths of the communication channel Ra1 and the communication channel Na1 are the same. Furthermore, it is more preferable to satisfy the relationship D<E+F.

[0087] Here, when the relationships A>B and A>C are satisfied, the forming of the communication channel Ra1 does not require high processing accuracy, compared to when the relationships A<B and A<C are satisfied. Therefore, the communication channel Ra1 is easily formed. In addition, for this purpose, it is more preferable to satisfy the relationships D>E and D>F.

[0088] On the other hand, satisfying the relationships A<B and A<C can increase the flow resistance of the communication channel Ra1 compared to satisfying the relationships A>B and A>C. For this purpose, satisfying the relationships D<E and D<F is more preferable.

[0089] Furthermore, as described above, the pressure chamber substrate 53 is provided with a fifth pressure chamber C_5 adjacent to the second pressure chamber C_2 in the Y2 direction. The nozzle substrate 51 is also provided with a second nozzle N_2 adjacent to the first nozzle N_1 in the Y2 direction and connected to the fifth pressure chamber C_5. Therefore, ink from the fifth pressure chamber C_5 can be ejected from the second nozzle N_2 independently of ink ejection from the first nozzle N_1.

[0090] Here, the pressure chamber substrate 53 also includes a sixth pressure chamber C_6, adjacent to the fifth pressure chamber C_5 in the Y2 direction. The second nozzle N_2 communicates with both the fifth and sixth pressure chambers C_5 and C_6. Therefore, the pressures in the fifth and sixth pressure chambers C_5 and C_6 can be utilized to efficiently eject ink from the second nozzle N_2.

[0091] As described above, a third pressure chamber C_3 and a fourth pressure chamber C_4 are also provided on the pressure chamber substrate 53. The third pressure chamber C_3 is located at a position different from the first pressure chamber C_1 in the X1 or X2 direction. The fourth pressure chamber C_4 is located at a position different from the second pressure chamber C_2 in the X1 or X2 direction and is adjacent to the third pressure chamber C_3 in the Y2 direction. Furthermore, a second common liquid chamber R2 is provided in the connecting plate 52. This second common liquid chamber R2 is located at a position different from the first common liquid chamber R1 in the X1 or X2 direction and is connected to the third pressure chamber C_3 and the fourth pressure chamber C_4. Furthermore, in addition to being connected to the first and second pressure chambers C_1 and C_2, the first nozzle N_1 is also connected to the third and fourth pressure chambers C_3 and C_4. Therefore, ink can be efficiently ejected from the first nozzle N_1 by utilizing not only the pressures of the first pressure chamber C_1 and the second pressure chamber C_2 but also the pressures of the third pressure chamber C_3 and the fourth pressure chamber C_4 .

[0092] As described above, the connecting plate 52 is further provided with a connecting channel Ra2, serving as an example of a "third connecting channel." This connecting channel Ra2 communicates with the second common liquid chamber R2 and is also in communication with the third pressure chamber C_3 and the fourth pressure chamber C_4. Therefore, compared to a configuration in which the third and fourth pressure chambers C_3 and C_4 communicate with the second common liquid chamber R2 via separate connecting channels, the flow resistance of the connecting channel Ra2 is increased. As a result, the degradation of ejection performance caused by the pressure of the third and fourth pressure chambers C_3 and C_4 escaping into the second common liquid chamber R2 can be reduced.

[0093] In this embodiment, as described above, the first common liquid chamber R1 is a liquid chamber that receives ink supplied to the first pressure chamber C_1 and the second pressure chamber C_2. Therefore, a hole 571 is provided in the first common liquid chamber R1 as a supply port for supplying liquid. On the other hand, the second common liquid chamber R2 is a liquid chamber that receives ink supplied to the third pressure chamber C_3 and the fourth pressure chamber C_4. Therefore, a hole 572 is provided in the second common liquid chamber R2 as a supply port for supplying ink. As described above, these holes 571 and 572 are connected to the circulation mechanism 60. This can suppress the increase in viscosity of the ink within the liquid ejection head 50 and reduce the accumulation of bubbles within the ink flow path of the liquid ejection head 50.

[0094] 2. Second Implementation

[0095] In the following, the second embodiment of the present invention will be described. In the following embodiments, elements having the same functions and effects as those in the first embodiment will be assigned the same reference numerals as in the first embodiment, and detailed descriptions thereof will be omitted as appropriate.

[0096] Figure 6 This is a cross-sectional view of a liquid ejection head 50A according to the second embodiment. The liquid ejection head 50A is identical to the liquid ejection head 50 according to the first embodiment, except for the shape of the communication channel Ra1. Although not shown, the communication channel Ra2 is configured similarly to the communication channel Ra1.

[0097] In this embodiment, if Figure 6 As shown, the connecting channel Ra1 has a shape in which the width gradually decreases toward the Z2 direction when viewed from a cross section perpendicular to the X-axis. That is, the connecting channel Ra1 has a portion Ra11 connected to the first pressure chamber C_1 and the second pressure chamber C_2, and a portion Ra12 between the portion Ra11 and the first common liquid chamber R1, and the width of the portion Ra12 along the Y-axis is smaller than the width of the portion Ra11 along the Y-axis. Figure 6 In FIG, “w2y” represents the width of portion Ra12 along the Y axis.

[0098] In addition, the shape of the communication channel Ra1 is not limited to Figure 6 In the example shown, for example, three or more portions having different widths along the Y axis may be provided, and the width of the communication channel Ra1 along the Y axis may be continuously reduced toward the Z2 direction.

[0099] Compared to the prior art, the second embodiment can also achieve improved ejection performance similar to the first embodiment. In this embodiment, since the width of the communication channel Ra1 along the Y axis decreases toward the first common liquid chamber R1, the flow resistance of the communication channel Ra1 is more easily increased compared to a structure with a fixed width.

[0100] 3. Third Implementation

[0101] In the following, the third embodiment of the present invention will be described. In the following embodiments, elements having the same functions and effects as those in the first embodiment will be assigned the same reference numerals as in the first embodiment, and detailed descriptions thereof will be omitted as appropriate.

[0102] Figure 7 It is a cross-sectional view of a liquid ejecting head 50B according to the third embodiment. Figure 8 To schematically represent Figure 7 FIG2 is a plan view of the flow path of a liquid ejection head 50B shown in FIG2. The liquid ejection head 50B is identical to the liquid ejection head 50 of the first embodiment described above, except that a connecting plate 52B is provided instead of the connecting plate 52. The connecting plate 52B is identical to the connecting plate 52, except that the shape of the connecting channel Ra1 is different.

[0103] like Figure 7 As shown, the connecting channel Ra1 of this embodiment, when viewed from a cross section perpendicular to the Y axis, has a portion Ra13 extending along the X axis and a portion Ra14 extending along the Z axis. Here, portion Ra14 is located between portion Ra13 and the first common liquid chamber R1. Similarly, the connecting channel Ra2 of this embodiment, when viewed from a cross section perpendicular to the Y axis, has a portion Ra23 extending along the X axis and a portion Ra24 extending along the Z axis. Here, portion Ra24 is located between portion Ra23 and the second common liquid chamber R2.

[0104] like Figure 8As shown, in the communication channel Ra1 of this embodiment, portion Ra13 is connected to the first pressure chamber C_1 and the second pressure chamber C_2, and the width of portion Ra14 along the Y axis is smaller than the width of portion Ra13 along the Y axis. Therefore, the communication channel Ra1 can be connected to the first pressure chamber C_1 and the second pressure chamber C_2 through portion Ra13, and the flow resistance of the communication channel Ra1 can be reduced through portion Ra14. Figure 8 , the width of the portion Ra14 along the Y axis is represented by “w2y”, and the width of the portion Ra14 along the X axis is represented by “w2x”.

[0105] Similarly, in the communication channel Ra2 of this embodiment, portion Ra23 communicates with the third pressure chamber C_3 and the fourth pressure chamber C_4, and the width of portion Ra24 along the Y-axis is smaller than the width of portion Ra23 along the Y-axis. Therefore, portion Ra23 enables communication channel Ra2 to communicate with the third pressure chamber C_3 and the fourth pressure chamber C_4, while portion Ra24 reduces the flow resistance of communication channel Ra2.

[0106] According to the third embodiment described above, as compared with the conventional technology, it is possible to improve the discharge performance in the same manner as in the first embodiment described above.

[0107] 4. Fourth Implementation

[0108] In the following, a fourth embodiment of the present invention will be described. Elements having the same functions and effects as those in the first embodiment will be assigned the same reference numerals as in the first embodiment, and detailed descriptions thereof will be omitted as appropriate.

[0109] Figure 9 It is a cross-sectional view of a liquid ejecting head 50C according to a fourth embodiment. Figure 10 To schematically represent Figure 9 FIG2 is a plan view of the flow path of a liquid ejection head 50C shown in FIG2. The liquid ejection head 50C is identical to the liquid ejection head 50 of the first embodiment described above, except that it includes a pressure chamber substrate 53C instead of the pressure chamber substrate 53. The pressure chamber substrate 53C is identical to the pressure chamber substrate 53, except that it includes a communication channel Ra1 and a portion of the communication channel Ra2.

[0110] like Figure 9 As shown, the communication channel Ra1 of this embodiment includes a portion Ra15 provided in the pressure chamber substrate 53C and a portion Ra16 provided in the communication plate 52. Similarly, the communication channel Ra2 of this embodiment includes a portion Ra25 provided in the pressure chamber substrate 53C and a portion Ra26 provided in the communication plate 52.

[0111] like Figure 10 As shown, in the connecting channel Ra1 of this embodiment, the minimum width of the portion Ra15 along the Y axis is smaller than the minimum width of the portion Ra16 along the Y axis. Therefore, the flow resistance of the connecting channel Ra1 can be reduced by the portion Ra15. Here, since the portion Ra15 is provided in the pressure chamber substrate 53C, the portion Ra15 can be formed together with the pressure chamber C through the same processing step. Therefore, the positioning of the portion Ra15 and the pressure chamber C can be easily implemented. In addition, in this embodiment, the total value A of the above-mentioned cross-sectional area is Figure 10 (W2X) and Figure 9 Twice the product of (W2Z) shown.

[0112] Similarly, in the communication channel Ra2 of this embodiment, the minimum width of portion Ra25 along the Y-axis is smaller than the minimum width of portion Ra26 along the Y-axis. Therefore, portion Ra25 can reduce the flow resistance of the communication channel Ra2. Here, because portion Ra25 is provided in the pressure chamber substrate 53C, it can be formed simultaneously with the pressure chamber C in the same processing step. This simplifies the positioning of portion Ra25 and the pressure chamber C.

[0113] Compared to the prior art, according to the fourth embodiment, it is also possible to achieve an improvement in ejection performance in the same manner as in the first embodiment. In this embodiment, the communication channel Ra1 and the communication channel Ra2 are provided in the pressure chamber substrate 53C. Therefore, compared to a structure in which the communication channel Ra1 and the communication channel Ra2 are not provided in the pressure chamber substrate 53C, it is possible to simplify the positioning of the communication channel Ra1 and the communication channel Ra2 and the pressure chamber C during manufacturing. In addition, although Figure 10 In the example shown, the portion Ra16 is provided in common to the first pressure chamber C_1 and the second pressure chamber C_2 . However, the portion Ra16 may be provided independently for each pressure chamber C, rather than being shared by the first pressure chamber C_1 and the second pressure chamber C_2 .

[0114] 5. Fifth embodiment

[0115] In the following, a fifth embodiment of the present invention will be described. Elements having the same functions and effects as those in the first embodiment will be assigned the same reference numerals as in the first embodiment, and detailed descriptions thereof will be omitted as appropriate.

[0116] Figure 11FIG2 is a plan view schematically showing the flow path of a liquid ejecting head 50D according to the fifth embodiment. The liquid ejecting head 50D is identical to the liquid ejecting head 50 according to the first embodiment, except that a connecting plate 52D is provided in place of the connecting plate 52. The connecting plate 52D is identical to the connecting plate 52, except that the shapes of the connecting channel Ra1 and the nozzle flow path Nf are different.

[0117] The communication passage Ra1 of this embodiment is provided to be shared by the three pressure chambers C. Figure 11 In FIG, the first pressure chamber C_1, the second pressure chamber C_2, and the fifth pressure chamber C_5 are shown as the three pressure chambers C. Similarly, the communication passage Ra2 of this embodiment is provided to be shared by the three pressure chambers C. Figure 11 , as the three pressure chambers C, a third pressure chamber C_3 , a fourth pressure chamber C_4 , and a seventh pressure chamber C_7 are shown.

[0118] The connecting channel Ra1 of this embodiment has a portion Ra17 that is connected to the first pressure chamber C_1, the second pressure chamber C_2, and the fifth pressure chamber C_5, and a portion Ra18 between the portion Ra17 and the first common liquid chamber R1. The portion Ra17 is shaped to extend along the Y-axis so as to span the first pressure chamber C_1, the second pressure chamber C_2, and the fifth pressure chamber C_5. Here, the length of the portion Ra18 along the Y-axis is shorter than the length of the portion Ra17 along the Y-axis. Therefore, the connecting channel Ra1 can be connected to the first pressure chamber C_1, the second pressure chamber C_2, and the fifth pressure chamber C_5 through the portion Ra17, and the flow resistance of the connecting channel Ra1 can be reduced through the portion Ra18.

[0119] Similarly, the connecting channel Ra2 of this embodiment has a portion Ra27 that is connected to the third pressure chamber C_3, the fourth pressure chamber C_4, and the seventh pressure chamber C_7, and a portion Ra28 between the portion Ra27 and the second common liquid chamber R2. The portion Ra27 is shaped to extend along the Y-axis so as to span the third pressure chamber C_3, the fourth pressure chamber C_4, and the seventh pressure chamber C_7. Here, the length of the portion Ra28 along the Y-axis is shorter than the length of the portion Ra27 along the Y-axis. Therefore, the connecting channel Ra2 can be connected to the third pressure chamber C_3, the fourth pressure chamber C_4, and the seventh pressure chamber C_7 through the portion Ra27, and the flow resistance of the connecting channel Ra2 can be reduced through the portion Ra28.

[0120] The first nozzle flow channel Nf_1, serving as the nozzle flow channel Nf in this embodiment, communicates with the first pressure chamber C_1, the second pressure chamber C_2, and the fifth pressure chamber C_5 via a connecting channel Na1. The connecting channel Na1 in this embodiment comprises a first portion Na11, a second portion Na12, and a third portion Na13. These portions are each formed by a hole independently extending through the connecting plate 52. Thus, the connecting channel Na1 comprises three flow channels for each nozzle N. The third portion Na13 is located between the fifth pressure chamber C_5 and the first nozzle flow channel Nf_1.

[0121] Compared to the prior art, the fifth embodiment can also achieve improved ejection performance, similar to the first embodiment described above. In this embodiment, the pressure chamber substrate 53 is further provided with a fifth pressure chamber C_5 adjacent to the second pressure chamber C_2 in the Y2 direction. The first nozzle N_1 is not only in communication with the first and second pressure chambers C_1 and C_2, but also with the fifth pressure chamber C_5. Therefore, ink can be efficiently ejected from the first nozzle N_1 using not only the pressure in the first and second pressure chambers C_1 and C_2, but also the pressure in the fifth pressure chamber C_5.

[0122] 6. Sixth Implementation

[0123] In the following, the sixth embodiment of the present invention will be described. In the embodiments exemplified below, elements having the same effects and functions as those in the first embodiment will be assigned the same reference numerals as in the first embodiment, and detailed descriptions thereof will be omitted as appropriate.

[0124] Figure 12 1 and 2 are diagrams illustrating a liquid flow path in a liquid ejection device 100E according to a sixth embodiment. The liquid ejection device 100E is the same as the liquid ejection device 100 according to the first embodiment, except that the circulation mechanism 60 is omitted.

[0125] In this embodiment, if Figure 12 As shown, ink from the liquid container 10 is supplied to the first common liquid chamber R1 and the second common liquid chamber R2. Although not shown, a pump for pressurizing ink to the liquid ejection head 50 may be provided between the liquid container 10 and the liquid ejection head 50.

[0126] Compared to the prior art, the sixth embodiment can also achieve improved ejection performance, similar to the first embodiment. However, in this embodiment, the first common liquid chamber R1 is a liquid chamber that receives ink supplied to the first pressure chamber C_1 and the second pressure chamber C_2. The second common liquid chamber R2 is a liquid chamber that receives ink discharged from the third pressure chamber C_3 and the fourth pressure chamber C_4.

[0127] 7. Modifications

[0128] Each of the above examples can be modified in many ways. The following examples illustrate specific modified methods that can be applied to each of the above examples. In addition, two or more methods arbitrarily selected from the following examples can be appropriately combined within the scope of non-contradiction.

[0129] 5-1. Modification 1

[0130] Although in the above-mentioned methods, the structure in each independent flow channel P is constructed in a symmetrical manner in the Y1 direction or the Y2 direction, it is not limited to this. The structure in each independent flow channel P can also be constructed in an asymmetrical manner in the Y1 direction or the Y2 direction.

[0131] 5-2. Modification 2

[0132] Although the above-described embodiments illustrate a structure having pressure chambers C in row L1 and pressure chambers C in row L2, the present invention is not limited to this structure, and the pressure chambers C in either row L1 or row L2 and their associated components may be omitted.

[0133] 5-3. Modification 3

[0134] Although the above-mentioned embodiments illustrate a structure in which the number of pressure chambers C included in each independent flow channel P is 4 or 6, the present invention is not limited to this structure. As long as the structure includes the first pressure chamber C_1 and the second pressure chamber C_2, the number is arbitrary.

[0135] 5-4. Modification 4

[0136] Although the above-described embodiments illustrate a serial-type liquid ejecting apparatus 100 in which the transport body 41 carrying the liquid ejecting head 50 reciprocates, the present invention can also be applied to a line-type liquid ejecting apparatus in which a plurality of nozzles N are distributed across the entire width of the medium M.

[0137] 5-5. Modification 5

[0138] The liquid ejection device 100 illustrated in each of the above embodiments can be used in various devices, including fax machines and copiers, in addition to being used in printing-specific devices. The application of the liquid ejection device of the present invention is not limited to printing. For example, a liquid ejection device that ejects a solution of a color material can be used as a manufacturing device for forming color filters for liquid crystal displays. Furthermore, a liquid ejection device that ejects a solution of a conductive material can be used as a manufacturing device for forming wiring and electrodes for wiring substrates.

[0139] Explanation of symbols

[0140] 10…Liquid container; 20…Control unit (control unit); 30…Conveying mechanism; 40…Moving mechanism; 41…Conveying body; 42…Conveying belt; 50…Liquid ejection head; 50A…Liquid ejection head; 50B…Liquid ejection head; 50C…Liquid ejection head; 50D…Liquid ejection head; 51…Nozzle substrate; 52…Connecting plate; 52B…Connecting plate; 52D…Connecting plate; 53…Pressure chamber substrate; 53C…Pressure chamber substrate; 54…Vibrating plate; 56…Piezoelectric element; 57…Casing; 58…Sealing plate Sealing body; 59…wiring substrate; 60…circulating mechanism; 61…first supply pump; 62…second supply pump; 63…storage container; 64…recovery channel; 65…supply channel; 70…driving circuit; 100…liquid ejecting device; 100E…liquid ejecting device; 551…vibration absorber; 552…vibration absorber; 571…hole; 572…hole; C…pressure chamber; C_1…first pressure chamber; C_2…second pressure chamber; C_3…third pressure chamber; C_4…fourth pressure chamber; C_5…fifth pressure chamber; C _6…sixth pressure chamber; C_7…seventh pressure chamber; C_8…eighth pressure chamber; L…nozzle array; L1…row; L2…row; M…medium; N…nozzle; N_1…first nozzle; N_2…second nozzle; Na1…connecting channel (first connecting channel); Na11…first portion; Na12…second portion; Na13…third portion; Na2…connecting channel; Na21…first portion; Na22…second portion; Nf…nozzle flow path; Nf_1…first nozzle flow path; Nf_2…second nozzle flow path Nozzle flow channel; P…independent flow channel; R1…first common liquid chamber; R2…second common liquid chamber; Ra1…connecting channel (second connecting channel); Ra11…part; Ra12…part; Ra13…part; Ra14…part; Ra15…part; Ra16…part; Ra17…part; Ra18…part; Ra2…connecting channel (third connecting channel); Ra23…part; Ra24…part; Ra25…part; Ra26…part; Ra27…part; Ra28…part.

Claims

1. A liquid ejection head, characterized in that: have: a pressure chamber substrate provided with a first pressure chamber and a second pressure chamber adjacent to the first pressure chamber in a first direction; a communication plate provided with a first communication passage communicating with the first pressure chamber and the second pressure chamber, and a first common liquid chamber communicating with the first pressure chamber and the second pressure chamber at a position different from the first communication passage; a nozzle substrate provided with a first nozzle communicating with the first pressure chamber and the second pressure chamber via the first communication channel; A second communication channel is provided on the pressure chamber substrate or the communication plate, the second communication channel being in communication with the first common liquid chamber and in communication with both the first pressure chamber and the second pressure chamber. The first communication channel comprises: a first portion disposed between the first pressure chamber and the first nozzle; a second portion interposed between the second pressure chamber and the first nozzle at a position separated relative to the first portion, Let A be the total cross-sectional area of ​​the second communication passage at its opening to the first pressure chamber and the second pressure chamber. The cross-sectional area of ​​the first portion at the opening to the first pressure chamber is set to B, When the cross-sectional area of ​​the second portion at the opening to the second pressure chamber is defined as C, Satisfies the relationship A<B+C.

2. The liquid ejection head according to claim 1, wherein The first pressure chamber and the second pressure chamber extend along a second direction intersecting the first direction. The first communication passage extends along a third direction intersecting the first direction and the second direction.

3. The liquid ejection head according to claim 1, wherein A first nozzle flow channel is further provided on the connecting plate. The first nozzle flow channel has a portion between the first portion, the second portion, and the first nozzle.

4. The liquid ejection head according to claim 3, wherein The first nozzle flow channel extends along a direction intersecting the first direction.

5. The liquid ejection head according to claim 1, wherein The relationship A>B and A>C is satisfied.

6. The liquid ejection head according to claim 1, wherein The relationship A<B and A<C is satisfied.

7. The liquid ejection head according to claim 1, wherein A fifth pressure chamber is further provided on the pressure chamber substrate and is adjacent to the second pressure chamber in the first direction. A second nozzle is further provided on the nozzle substrate, adjacent to the first nozzle in the first direction and communicating with the fifth pressure chamber.

8. The liquid ejection head according to claim 7, wherein A sixth pressure chamber is further provided on the pressure chamber substrate and is adjacent to the fifth pressure chamber in the first direction. The second nozzle is communicated with both the fifth pressure chamber and the sixth pressure chamber.

9. The liquid ejection head according to claim 1, wherein The pressure chamber substrate is further provided with a fifth pressure chamber adjacent to the second pressure chamber in the first direction. The first nozzle is in common communication with the first pressure chamber and the second pressure chamber, and is also in common communication with the fifth pressure chamber.

10. The liquid ejection head according to claim 1, wherein The first common liquid chamber is a liquid chamber that accommodates liquid supplied to the first pressure chamber and the second pressure chamber.

11. The liquid ejection head according to claim 1, wherein The first common liquid chamber is a liquid chamber that accommodates liquid discharged from the first pressure chamber and the second pressure chamber.

12. A liquid ejection head, characterized in that: have: a pressure chamber substrate provided with a first pressure chamber and a second pressure chamber adjacent to the first pressure chamber in a first direction; a communication plate provided with a first communication passage communicating with the first pressure chamber and the second pressure chamber, and a first common liquid chamber communicating with the first pressure chamber and the second pressure chamber at a position different from the first communication passage; a nozzle substrate provided with a first nozzle communicating with the first pressure chamber and the second pressure chamber via the first communication channel; A second communication channel is provided on the pressure chamber substrate or the communication plate, the second communication channel being in communication with the first common liquid chamber and in communication with both the first pressure chamber and the second pressure chamber. A third pressure chamber and a fourth pressure chamber are also provided on the pressure chamber substrate. The third pressure chamber is arranged at a position different from that of the first pressure chamber in a second direction intersecting the first direction. The fourth pressure chamber is arranged at a position different from the second pressure chamber in the second direction and is adjacent to the third pressure chamber in the first direction. A second common liquid chamber is further provided on the communication plate. The second common liquid chamber is arranged at a position different from the first common liquid chamber in the second direction and is communicated with the third pressure chamber and the fourth pressure chamber. The first nozzle is in common communication with the first pressure chamber and the second pressure chamber, and is also in common communication with the third pressure chamber and the fourth pressure chamber.

13. The liquid ejection head according to claim 12, wherein A third communication channel is further provided on the pressure chamber substrate or the communication plate. The third communication channel is communicated with the second common liquid chamber and is communicated with both the third pressure chamber and the fourth pressure chamber.

14. The liquid ejection head according to claim 12 or 13, wherein: The first common liquid chamber is a liquid chamber that receives liquid supplied to the first pressure chamber and the second pressure chamber. The second common liquid chamber is a liquid chamber that accommodates liquid supplied to the third pressure chamber and the fourth pressure chamber.

15. The liquid ejection head according to claim 12 or 13, wherein The first common liquid chamber is a liquid chamber that receives liquid supplied to the first pressure chamber and the second pressure chamber. The second common liquid chamber is a liquid chamber that accommodates liquid discharged from the third pressure chamber and the fourth pressure chamber.

16. The liquid ejection head according to claim 1 or 12, wherein: The second communication channel is not provided on the pressure chamber substrate. The second communicating channel is provided on the communicating plate.

17. The liquid ejection head according to claim 1 or 12, wherein: The second communication channel is provided on the pressure chamber substrate.

18. A liquid ejection device, characterized in that: have: The liquid ejection head according to any one of claims 1 to 17; A control unit controls the liquid ejection operation of the liquid ejection head.

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