Liquid jet head and liquid jet apparatus

Abstract

To suppress increase in liquid pressure loss even if a filter is provided in a common liquid chamber.SOLUTION: A liquid jet head comprises: a nozzle array configured in such a manner that a plurality of nozzles for jetting a liquid in a first direction are arranged in a second direction orthogonal to the first direction; a driving element for jetting the liquid from the plurality of nozzles of the nozzle array; and a plurality lamination components which define a common liquid chamber communicating with the plurality of nozzles of the nozzle array. The plurality of lamination components include: a filter which divides the common liquid chamber into an upstream side common liquid chamber and a downstream side common liquid chamber; a first case which defines a first common liquid chamber part as a part of the upstream side common liquid chamber, and is laminated on the filter; and a second case which defines a second common liquid chamber part as a part of the upstream side common liquid chamber, and is laminated on the first case. The second common liquid chamber part is positioned in a direction opposite to the first direction with respect to the driving element, and a width of the second common liquid chamber part in a third direction orthogonal to the first direction and the second direction is longer than a width of the first common liquid chamber part in the third direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] Liquid ejection devices, such as inkjet printers, are generally provided with a liquid ejection head that ejects liquid such as ink. For example, Patent Document 1 discloses a liquid ejection device that ejects liquid stored in a common liquid chamber from nozzles. Patent Document 2 discloses a liquid ejection device in which a filter is provided in the common liquid chamber. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-133604 [Patent Document 2] Japanese Patent Application Laid-Open No. 2016-000461 Summary of the Invention [Problem to be solved by the invention]

[0004] If the filter described in Patent Document 2 is provided in the common liquid chamber described in Patent Document 1, the pressure loss of the liquid in the common liquid chamber increases, degrading the nozzle ejection characteristics. The ejection characteristics are one or both of the ejection amount and the ejection speed. To suppress the increase in liquid pressure loss, the common liquid chamber needs to be enlarged. However, in recent years, there has been a demand for higher density liquid ejection devices. If the common liquid chamber is enlarged while maintaining the size of the liquid ejection head, the shape of the common liquid chamber becomes complex, making it difficult to manufacture the liquid ejection head. For these reasons, in liquid ejection devices of the prior art, it was difficult to suppress the increase in liquid pressure loss when a filter was provided in the common liquid chamber. [Means for solving the problem]

[0005] In order to solve the above problems, a preferred embodiment of the present invention provides a liquid jet head comprising: a nozzle array configured by arranging a plurality of nozzles that eject liquid in a first direction in a second direction perpendicular to the first direction; a drive element for ejecting liquid from the plurality of nozzles in the nozzle array; and a plurality of laminated components that define a common liquid chamber communicating with the plurality of nozzles in the nozzle array, wherein the plurality of laminated components include a filter that divides the common liquid chamber into an upstream common liquid chamber and a downstream common liquid chamber; a first case that defines a first common liquid chamber portion that is part of the upstream common liquid chamber and is laminated on the filter; and a second case that defines a second common liquid chamber portion that is part of the upstream common liquid chamber and is laminated on the first case, wherein the second common liquid chamber portion is located in a direction opposite to the first direction relative to the drive element, and the width of the second common liquid chamber portion in a third direction perpendicular to the first direction and the second direction is longer than the width of the first common liquid chamber portion in the third direction.

[0006] A liquid ejecting apparatus according to a preferred aspect of the present invention includes the liquid ejecting head according to the above aspect, and a liquid reservoir that stores liquid to be supplied to the liquid ejecting head. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram illustrating a liquid ejecting apparatus 100 according to a first embodiment. [Figure 2] FIG. 2 is a perspective view of a liquid jet head 50 and a support 41 according to the first embodiment. [Figure 3] FIG. 1 is an exploded perspective view of a liquid jet head 50 according to a first embodiment. [Figure 4] FIG. [Figure 5] Cross-sectional view taken along line AA in Figure 4. [Figure 6] Cross-sectional view of line BB in Figure 4. [Figure 7] Cross-sectional view taken along line CC in Figure 5. [Figure 8] FIG. 10 is an exploded perspective view of a head chip 54A according to a first modified example. [Figure 9] Cross-sectional view taken along line DD in Figure 8. [Figure 10] Cross-sectional view taken along line EE in Figure 8. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments of 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 those of the actual parts. Furthermore, since the embodiments described below are preferred specific examples of the present invention, various technically preferable limitations are applied, 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] For convenience, the following description will use the mutually intersecting X-axis, Y-axis, and Z-axis as appropriate. In the following description, one direction along the X-axis is the X1 direction, and the direction opposite the X1 direction is the X2 direction. Similarly, the Y1 direction and the Y2 direction are opposite directions along the Y-axis. Furthermore, the Z1 direction and the Z2 direction are opposite directions along the Z-axis. Viewing in the Z-axis direction may be simply referred to as "planar view." The Z2 direction is an example of a "first direction." The Y1 direction or the Y2 direction is an example of a "second direction." The X1 direction or the X2 direction is an example of a "third direction."

[0010] Typically, the Z axis is a vertical axis, and the Z2 direction corresponds to the downward direction in the vertical direction. However, the Z axis does not have to be a vertical axis. Furthermore, the X axis, Y axis, and Z axis are typically perpendicular to each other, but are not limited to this. For example, they may intersect at an angle between 80° and 100°.

[0011] 1. First embodiment 1-1. Schematic configuration of the liquid ejection device FIG. 1 is a schematic diagram illustrating a liquid ejection apparatus 100 according to a first embodiment. The liquid ejection apparatus 100 is an inkjet printing apparatus that ejects ink, which is an example of a "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 a printing target made of any material, such as a resin film or fabric.

[0012] As shown in FIG. 1, the liquid ejecting device 100 includes a liquid storage section 10, a control unit 20, a transport mechanism 30, a movement mechanism 40, and a liquid ejecting head 50.

[0013] The liquid storage unit 10 is a container that stores ink. Specific examples of the liquid storage unit 10 include a cartridge that is detachable from the liquid ejection device 100, a bag-shaped ink pack made of a flexible film, and a container such as an ink tank that can be refilled with ink.

[0014] Although not shown, the liquid storage unit 10 has multiple containers that store different types of ink. The inks stored in the multiple containers are not particularly limited, but include, for example, cyan ink, magenta ink, yellow ink, black ink, clear ink, white ink, and treatment liquid, and a combination of two or more of these is used. The composition of the ink is not particularly limited, and may be, for example, an aqueous ink in which a coloring material such as a dye or pigment is dissolved in an aqueous solvent, a solvent-based ink in which a coloring material is dissolved in an organic solvent, or an ultraviolet-curable ink.

[0015] In this embodiment, four different types of ink are used, each having a different color, such as cyan ink, magenta ink, yellow ink, and black ink.

[0016] The control unit 20 controls the operation of each element of the liquid ejection device 100. For example, the control unit 20 includes a processing circuit such as a CPU or FPGA, and a storage circuit such as a semiconductor memory. CPU stands for Central Processing Unit. FPGA stands for Field Programmable Gate Array. The control unit 20 outputs a drive signal Com and a control signal S to the liquid ejection head 50. The drive signal Com is a signal that includes a drive pulse that drives a drive element of the liquid ejection head 50. The control signal S is a signal that specifies whether or not to supply the drive signal Com to the drive element.

[0017] The transport mechanism 30 transports the medium M in a transport direction DM, which is the Y1 direction, under the control of the control unit 20. The movement mechanism 40 reciprocates the liquid ejection head 50 in the X1 direction and the X2 direction under the control of the control unit 20. In the example shown in FIG. 1, the movement mechanism 40 has a substantially box-shaped support 41 called a carriage that houses the liquid ejection head 50, and a transport belt 42 to which the support 41 is fixed. Note that, in addition to the liquid ejection head 50, the aforementioned liquid storage unit 10 may also be mounted on the support 41.

[0018] The liquid jet head 50 has a plurality of head chips 54, as will be described later, and under the control of the control unit 20, ejects ink supplied from the liquid storage section 10 from each of the plurality of nozzles N of each head chip 54 in the ejection direction, that is, 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 jet head 50 by the movement mechanism 40, so that a predetermined image is formed in ink on the surface of the medium M.

[0019] 1-2. Liquid jet head installation status FIG. 2 is a perspective view of a liquid jet head 50 and a support 41 according to the first embodiment. As shown in FIG. 2, the liquid jet head 50 is supported by the support 41. The support 41 is a member that supports the liquid jet head 50, and as described above, in this embodiment, it is a substantially box-shaped carriage. The constituent material of the support 41 is not particularly limited, but it is preferable to use a metal material such as stainless steel, aluminum, titanium, or a magnesium alloy. When the support 41 is made of a metal material, the rigidity of the support 41 can be easily increased, and therefore the liquid jet head 50 can be stably supported relative to the support 41.

[0020] Here, an opening 41a and a plurality of screw holes 41b are provided in the support body 41. In this embodiment, the support body 41 is substantially box-shaped with a plate-like bottom, and, for example, the opening 41a and the plurality of screw holes 41b are provided in the bottom. The liquid jet head 50 is inserted into the opening 41a and fixed to the support body 41 by screws using the plurality of screw holes 41b. As described above, the liquid jet head 50 is attached to the support body 41.

[0021] 2, one liquid jet head 50 is attached to the support 41. The number of liquid jet heads 50 attached to the support 41 may be two or more. In this case, the support 41 is provided with an opening 41a having a number or shape corresponding to the number of liquid jet heads 50.

[0022] 1-3. Liquid jet head configuration Fig. 3 is an exploded perspective view of the liquid jet head 50 according to the first embodiment. As shown in Fig. 3, the liquid jet head 50 includes a flow path structure 51, a substrate unit 52, a holder 53, four head chips 54_1 to 54_4, a fixing plate 55, and a cover 58. These are arranged in the Z2 direction in the following order: cover 58, substrate unit 52, flow path structure 51, holder 53, four head chips 54, and fixing plate 55. Each part of the liquid jet head 50 will be described below in order.

[0023] The flow path structure 51 is a structure in which a flow path is provided inside for supplying the ink stored in the liquid storage portion 10 to the four head chips 54. The flow path structure 51 has a flow path member 51a and eight connection pipes 51b.

[0024] Although not shown, the flow path member 51a is provided with four supply flow paths, one for each of the four ink types, and four discharge flow paths, one for each of the four ink types. Each of the four supply flow paths has one inlet that receives ink supply from the connection tube 51b and two discharge outlets that discharge ink toward the connection port IO of the head chip 54 (described below). Each of the four discharge flow paths has two inlet ports that receive ink supply from the connection port IO of the head chip 54 and one discharge outlet that discharges ink to the connection tube 51b. The inlet ports of each supply flow path and the discharge outlets of each discharge flow path are provided on the surface of the flow path member 51a facing the Z1 direction. In contrast, the discharge outlets of each supply flow path and the inlet ports of each discharge flow path are provided on the surface of the flow path member 51a facing the Z2 direction.

[0025] Furthermore, the flow path member 51a is provided with a plurality of wiring holes 51c. Each of the plurality of wiring holes 51c is a hole through which a wiring substrate 54i (described later) of the head chip 54 is passed toward the substrate unit 52. The side surface of the flow path member 51a is provided with two notched portions in the circumferential direction. The flow path member 51a is also provided with holes (not shown), and is fixed to the holder 53 by screws using the holes.

[0026] Although not shown, the flow path member 51a is configured as a laminate in which multiple substrates are stacked in a direction along the Z axis. In this specification, the expression "element A and element B are stacked" is not limited to a configuration in which element A and element B are in direct contact with each other. In other words, a configuration in which another element C is interposed between element A and element B is also included in the concept of "element A and element B are stacked with each other." Similarly, the expression "element B is formed on the surface of element A" is not limited to a configuration in which element A and element B are in direct contact with each other. In other words, even if element C is formed on the surface of element A and element B is formed on the surface of element C, the concept of "element B is formed on the surface of element A" is included in the concept of "element A is formed on the surface of element A" as long as at least a portion of element A and element B overlap in a planar view.

[0027] Each of the plurality of substrates is appropriately provided with grooves and holes for the aforementioned supply flow paths and discharge flow paths. The plurality of substrates are joined to one another, for example, by adhesive, brazing, welding, or screwing. In the following description, the plurality of substrates are assumed to be joined to one another by adhesive. When joined by adhesive, the adhesive is applied, and then the plurality of components are pressed together until the adhesive hardens. Note that, if necessary, a sheet-like sealing member made of a rubber material or the like may be appropriately disposed between the plurality of substrates. Furthermore, the number or thickness of the substrates constituting the flow path member 51a is determined depending on the shape and other aspects of the supply flow paths and discharge flow paths, and is not particularly limited and is arbitrary.

[0028] Each of the eight connecting pipes 51b is a pipe protruding from the surface of the flow path member 51a facing the Z1 direction. The eight connecting pipes 51b correspond to the four supply flow paths and the four discharge flow paths described above, and are connected to the inlets of the corresponding supply flow paths or the discharge outlets of the corresponding discharge flow paths.

[0029] Of the eight connection tubes 51b, four connection tubes 51b corresponding to the four supply flow paths are connected to the liquid storage unit 10 so as to receive different types of ink. On the other hand, of the eight connection tubes 51b, four connection tubes 51b corresponding to the four discharge flow paths are connected to a discharge container for discharging ink at a predetermined time, such as when the liquid jet head 50 is initially filled with ink, or to a sub-tank or the like that is disposed between the liquid storage unit 10 and the liquid jet head 50 and is capable of holding ink. During normal times, such as during printing, the four connection tubes 51b corresponding to the four discharge flow paths are closed with a sealing body such as a cap. Note that when the liquid storage unit 10 is connected to the liquid jet head 50 via a circulation mechanism, the four connection tubes 51b corresponding to the four discharge flow paths are normally connected to a flow path for recovering ink in the circulation mechanism.

[0030] The substrate unit 52 is an assembly having mounted components for electrically connecting the liquid jet head 50 to the control unit 20. The substrate unit 52 has a circuit board 52a, a connector 52b, and a support plate 52c.

[0031] The circuit board 52a is a printed wiring board such as a rigid wiring board having wiring for electrically connecting each head chip 54 and the connector 52b. The circuit board 52a is disposed on the flow path structure 51 via a support plate 52c, and the connector 52b is disposed on the surface of the circuit board 52a facing the Z1 direction.

[0032] The connector 52b is a connecting part for electrically connecting the liquid jet head 50 and the control unit 20. The support plate 52c is a plate-shaped member for attaching the circuit board 52a to the flow path structure 51. The circuit board 52a is placed on one surface of the support plate 52c, and the circuit board 52a is fixed to the support plate 52c by screws or the like. The other surface of the support plate 52c is in contact with the flow path structure 51, and in this state, the support plate 52c is fixed to the flow path structure 51 by screws or the like. The constituent material of the support plate 52c is a resin material such as a modified polyphenylene ether resin such as Zylon, a polyphenylene sulfide resin, or a polypropylene resin. Zylon is a registered trademark. The constituent material of the support plate 52c may include a fiber base material such as glass fiber, or a filler such as alumina particles, in addition to the resin material.

[0033] The holder 53 is a structure that houses and supports four head chips 54. The holder 53 is generally tray-shaped and has a recess 53a, multiple ink holes 53b, multiple wiring holes 53c, multiple recesses 53d, multiple holes 53e, multiple screw holes 53i, and multiple screw holes 53k. The recess 53a opens in the Z1 direction and is a space in which the flow path member 51a is disposed. Each of the multiple ink holes 53b is a flow path that distributes ink between the head chip 54 and the flow path structure 51. Each of the multiple wiring holes 53c is a hole through which the wiring substrate 54i of the head chip 54 passes toward the substrate unit 52. Each of the multiple recesses 53d is open in the Z2 direction and is a space in which the head chip 54 is disposed. The holes 53e are flow paths for connecting each of the connection ports IO provided on the head chips 54 (described later) to the discharge ports of the supply flow paths and the inlets of the discharge flow paths of the flow path member 51a. The screw holes 53i are screw holes for screwing the holder 53 to the support body 41. The screw holes 53k are screw holes for screwing the cover 58 to the holder 53.

[0034] Each head chip 54 ejects ink. Each head chip 54 has a plurality of nozzles N that eject a first ink and a plurality of nozzles N that eject a second ink that is different from the first ink. Here, the first ink and the second ink are two of the four types of ink mentioned above. For example, head chip 54_1 and head chip 54_2 each use two of the four types of ink as the first ink and the second ink. Then, head chip 54_3 and head chip 54_4 each use the remaining two types of ink. Each head chip 54 is provided with a wiring substrate 54i. Note that FIG. 3 shows a simplified configuration of each head chip 54. The configuration of the head chip 54 will be described in detail with reference to FIG. 4, which will be described later.

[0035] The fixing plate 55 is a plate-like member to which the four head chips 54 and the holder 53 are fixed. Specifically, the fixing plate 55 is arranged so that the four head chips 54 are sandwiched between the fixing plate 55 and the holder 53, and each head chip 54 and the holder 53 are fixed with an adhesive or the like. The fixing plate 55 is provided with a plurality of openings 55a that expose the nozzle surfaces FN of the four head chips 54. In the example shown in FIG. 3, the plurality of openings 55a are provided individually for each head chip 54. The fixing plate 55 is made of a metal material such as stainless steel, titanium, or magnesium alloy, for example.

[0036] The cover 58 is a box-shaped member that houses the board unit 52. The cover 58 is made of a resin material such as modified polyphenylene ether resin, polyphenylene sulfide resin, or polypropylene resin, similar to the support plate 52c described above.

[0037] Eight through holes 58a and an opening 58b are provided in the cover 58. The eight through holes 58a correspond to the eight connecting pipes 51b of the flow path structure 51, and the corresponding connecting pipes 51b are inserted into each through hole 58a. The aforementioned connector 52b is passed through the opening 58b from the inside to the outside of the cover 58.

[0038] 1-4.Head chip configuration FIG. 4 is an exploded perspective view of the head chip 54. FIG. 5 is a cross-sectional view taken along line AA in FIG. 4. FIG. 6 is a cross-sectional view taken along line BB in FIG. 4. However, to avoid complication of the drawing, the wiring substrate 54i is omitted from FIG. 6. As shown in FIGS. 4 and 5, the head chip 54 has a plurality of nozzles N arranged in the direction along the Y axis. The plurality of nozzles N are divided into a first nozzle row L1 and a second nozzle row L2 arranged at intervals along the X axis. Each of the first nozzle row L1 and the second nozzle row L2 is a collection of a plurality of nozzles N arranged linearly in the direction along the Y axis.

[0039] The head chips 54 are configured to be approximately symmetrical with respect to each other in the direction along the X-axis. However, the positions of the multiple nozzles N of the first nozzle row L1 and the multiple nozzles N of the second nozzle row L2 in the direction along the Y-axis may be the same or different. Figure 5 illustrates a configuration in which the positions of the multiple nozzles N of the first nozzle row L1 and the multiple nozzles N of the second nozzle row L2 in the direction along the Y-axis are the same.

[0040] 4 and 5, the head chip 54 includes a communication plate 54a, a pressure chamber substrate 54b, a nozzle plate 54c, a vibration absorber 54d, a vibration plate 54e, multiple piezoelectric elements 54f, a protective substrate 54g, a wiring board 54i, a drive circuit 54j, a frame 54k, a first case 54m, a second case 54n, and a filter 54o. However, to avoid cluttering the illustration, the pressure chamber substrate 54b, the vibration plate 54e, the multiple piezoelectric elements 54f, the vibration absorber 54d, the wiring board 54i, the drive circuit 54j, and the frame 54k are not shown in FIG.

[0041] The communication plate 54a and the pressure chamber substrate 54b are stacked in this order in the Z1 direction to form a flow path for supplying ink to the multiple nozzles N. A filter 54o, a pressure chamber substrate 54b, a vibration plate 54e, multiple piezoelectric elements 54f, a protective substrate 54g, a first case 54m, a second case 54n, a wiring substrate 54i, and a drive circuit 54j are installed in an area located further in the Z1 direction than the communication plate 54a. On the other hand, a nozzle plate 54c, a vibration absorber 54d, and a frame 54k are installed in an area located further in the Z2 direction than the communication plate 54a. Each element of the head chip 54 is generally a plate-like member elongated in the Y direction and joined to each other, for example, with an adhesive. Each element of the head chip 54 will be described below in order.

[0042] The nozzle plate 54c is a plate-like member provided with a plurality of nozzles N, each of which is a first nozzle row L1 and a second nozzle row L2. Each of the nozzles N is a through-hole that allows ink to pass through. The surface of the nozzle plate 54c facing the Z2 direction is the nozzle face FN. In other words, the normal direction of the nozzle face FN is the direction of the normal vector of the nozzle face FN, which is the ejection direction, the Z2 direction. The nozzle plate 54c is manufactured by processing a silicon single crystal substrate using semiconductor manufacturing techniques such as dry etching or wet etching. However, other known methods and materials may also be used as appropriate to manufacture the nozzle plate 54c. Furthermore, the cross-sectional shape of the nozzle N is typically circular, but is not limited thereto and may be non-circular, such as polygonal or elliptical.

[0043] The communication plate 54a is provided with a downstream common liquid chamber DR, a plurality of supply channels Ra, and a plurality of communication channels Na, which will be described later, for each of the first nozzle row L1 and the second nozzle row L2. Here, the downstream common liquid chamber DR that communicates with the plurality of nozzles N of the first nozzle row L1 is referred to as a downstream common liquid chamber DR[L1]. The downstream common liquid chamber DR that communicates with the plurality of nozzles N of the second nozzle row L2 is referred to as a downstream common liquid chamber DR[L2].

[0044] The downstream common liquid chamber DR[L1] includes an opening DR1[L1] that penetrates the communicating plate 54a in the Z-axis direction, an opening DR2[L1] that penetrates the communicating plate 54a in the Z-axis direction, and a connecting flow path Xa[L1]. The openings DR1[L1] and DR2[L1] are separated by a communicating plate beam portion BR2[L1] that extends in the X-axis direction. The openings DR1[L1] and DR2[L1] each extend in the Y-axis direction. Similarly, the downstream common liquid chamber DR[L2] includes an opening DR1[L2] that penetrates the communicating plate 54a in the Z-axis direction, an opening DR2[L2] that penetrates the communicating plate 54a in the Z-axis direction, and a connecting flow path Xa[L2]. The openings DR1[L2] and DR2[L2] are separated by a communicating plate beam portion BR2[L2] that extends in the X-axis direction. The opening DR1[L2] and the opening DR2[L2] each extend in the Y-axis direction.

[0045] Here, when there is no particular distinction between the openings DR1[L1] and DR1[L2], they are simply referred to as the opening DR1. When there is no particular distinction between the connection flow path Xa[L1] and the connection flow path Xa[L2], they are simply referred to as the connection flow path Xa. Furthermore, when there is no particular distinction between openings DR2[L1] and DR2[L2], they will simply be referred to as openings DR2. When there is no particular distinction between communicating plate beam portion BR2[L1] and communicating plate beam portion BR2[L2], they will simply be referred to as communicating plate beam portion BR2. In the example of FIG. 4, one communicating plate beam portion BR2 is provided corresponding to each of the first nozzle row L1 and the second nozzle row L2, but multiple communicating plate beam portions BR2 may be provided corresponding to each of the first nozzle row L1 and the second nozzle row L2. The communicating plate beam portion BR2 is an example of a "second beam portion."

[0046] The connection flow path Xa communicates with the multiple supply flow paths Ra at one end in the X-axis direction, and communicates with both the openings DR1 and DR2 at the other end in the X-axis direction. That is, ink that has passed through the openings DR1 and DR2 flows into the multiple supply flow paths Ra via the connection flow path Xa. Each of the supply flow path Ra and the communication flow path Na is a through hole formed for each nozzle N.

[0047] As shown in FIG. 5, a common liquid chamber R communicating with the plurality of nozzles N is provided for each of the first nozzle row L1 and the second nozzle row L2. In the following description, the common liquid chamber R communicating with the plurality of nozzles N of the first nozzle row L1 may be referred to as a common liquid chamber R[L1]. The common liquid chamber R communicating with the plurality of nozzles N of the second nozzle row L2 may be referred to as a common liquid chamber R[L2]. The common liquid chamber R stores ink to be supplied to the plurality of pressure chambers CB. The common liquid chamber R is defined by a vibration absorber 54d, a communication plate 54a, a filter 54o, a first case 54m, and a second case 54n. The vibration absorber 54d, the communication plate 54a, the filter 54o, the first case 54m, and the second case 54n are examples of "plurality of stacked components." The filter 54o divides the common liquid chamber R into an upstream common liquid chamber UR and a downstream common liquid chamber DR. The communication plate 54a defines a part of the downstream common liquid chamber DR.

[0048] The pressure chamber substrate 54b is a plate-shaped member in which a plurality of pressure chambers CB are provided for each of the first nozzle row L1 and the second nozzle row L2. The plurality of pressure chambers CB are arranged in a direction along the Y axis. Each pressure chamber CB is formed for each nozzle N and is an elongated space extending in a direction along the X axis in a plan view. Like the nozzle plate 54c described above, the communication plate 54a and the pressure chamber substrate 54b are manufactured by processing a silicon single crystal substrate using semiconductor manufacturing technology, for example. However, other known methods and materials may also be used as appropriate to manufacture the communication plate 54a and the pressure chamber substrate 54b.

[0049] The pressure chamber CB is a space located between the communication plate 54a and the vibration plate 54e. A plurality of pressure chambers CB are arranged in the direction along the Y axis for each of the first nozzle row L1 and the second nozzle row L2. The pressure chamber CB also communicates with the communication flow path Na and the supply flow path Ra. Therefore, the pressure chamber CB communicates with the nozzle N via the communication flow path Na, and with the downstream common liquid chamber DR via the supply flow path Ra.

[0050] A diaphragm 54e is disposed on the surface of the pressure chamber substrate 54b facing the Z1 direction. The diaphragm 54e is a plate-like member that can elastically vibrate. The diaphragm 54e has, for example, a first layer and a second layer, which are stacked in this order in the Z1 direction. The first layer is, for example, an elastic film made of silicon oxide. The elastic film is formed, for example, by thermally oxidizing one surface of a silicon single crystal substrate. The second layer is, for example, an insulating film made of zirconium oxide. The insulating film is formed, for example, by forming a zirconium layer by sputtering and then thermally oxidizing the layer. Note that the diaphragm 54e is not limited to the configuration of the stack of the first and second layers described above, and may be, for example, a single layer or three or more layers.

[0051] On the surface of the vibration plate 54e facing the Z1 direction, a plurality of piezoelectric elements 54f corresponding to the nozzles N of the first nozzle row L1 and the second nozzle row L2 are arranged as drive elements. Each piezoelectric element 54f is a passive element that deforms when a drive signal Com is supplied. Each piezoelectric element 54f has an elongated shape extending in the direction along the X-axis in a plan view. The plurality of piezoelectric elements 54f are arranged in the direction along the Y-axis so as to correspond to the plurality of pressure chambers CB. The piezoelectric elements 54f overlap the pressure chambers CB in a plan view.

[0052] Each piezoelectric element 54f includes a first electrode, a piezoelectric layer, and a second electrode, which are stacked in this order in the Z1 direction (not shown). One of the first and second electrodes is an individual electrode spaced apart from the other for each piezoelectric element 54f, and a drive signal Com is applied to the one electrode. The other of the first and second electrodes is a strip-shaped common electrode extending along the Y-axis so as to extend continuously across the plurality of piezoelectric elements 54f, and a predetermined reference potential is supplied to the other electrode. Examples of metal materials for these electrodes include platinum, aluminum, nickel, gold, and copper. One of these metals can be used alone, or two or more can be combined in the form of an alloy or laminate. The piezoelectric layer is made of a piezoelectric material such as lead zirconate titanate, and is, for example, strip-shaped and extending along the Y-axis so as to extend continuously across the plurality of piezoelectric elements 54f. However, the piezoelectric layer may be integral across the plurality of piezoelectric elements 54f. In this case, the piezoelectric layer is provided with through-holes that extend in the direction along the X-axis in areas that correspond in plan view to the gaps between adjacent pressure chambers CB. When the vibration plate 54e vibrates in conjunction with the deformation of the piezoelectric elements 54f, the pressure in the pressure chambers CB fluctuates, causing ink to be ejected from the nozzles N. Note that instead of the piezoelectric elements 54f, a heating element that heats the ink in the pressure chambers CB may be used as the driving element.

[0053] The protective substrate 54g is a plate-like member installed on the surface of the vibration plate 54e facing the Z1 direction, and protects the multiple piezoelectric elements 54f and reinforces the mechanical strength of the vibration plate 54e. As shown in FIGS. 4 and 5, an opening h1 is provided in the protective substrate 54g. The opening h1 is a hole through which the wiring substrate 54i passes. Furthermore, the surface of the protective substrate 54g facing the Z2 direction has two recesses recessed in the Z1 direction, one corresponding to each of the first nozzle row L1 and the second nozzle row L2. The multiple piezoelectric elements 54f are housed between the recesses of the protective substrate 54g and the vibration plate 54e. The protective substrate 54g is formed, for example, from a silicon monocrystalline substrate.

[0054] The filter 54o is a plate- or sheet-shaped member laminated on the surface of the communication plate 54a facing the Z1 direction. The filter 54o allows ink to pass through while capturing foreign matter that gets mixed into the ink.

[0055] In the direction along the X-axis, the outer shape of the filter 54o is the same as or smaller than the outer shapes of the first case 54m and the second case 54n, and is larger than the outer shape of the communication plate 54a. In the example of Figure 5, the outer shape of the filter 54o in the direction along the X-axis is smaller than the outer shape of the second case 54n.

[0056] The filter 54o is provided with a plurality of filter holes h23 through which ink passes and an opening h21. The plurality of filter holes h23 are an example of "a plurality of holes through which liquid passes." The opening h21 is a through-hole through which the pressure chamber substrate 54b passes. The plurality of filter holes h23 are provided within a filter hole region FR. In the following description, the filter hole region FR provided with the filter holes h23 communicating with the downstream common liquid chamber DR[L1] may be referred to as the filter hole region FR[L1], and the filter hole region FR provided with the filter holes h23 communicating with the downstream common liquid chamber DR[L2] may be referred to as the filter hole region FR[L1]. The filter holes h23 provided in the filter hole region FR[L1] may be referred to as the filter holes h23[L1], and the filter holes h23 provided in the filter hole region FR[L2] may be referred to as the filter holes h23[L2]. The filter hole region FR is formed of an electroformed filter. The electroformed filter may be made of, for example, a Ni-Pd alloy, or may be made of stainless steel.

[0057] The first case 54m is a member laminated on the surface of the filter 54o facing the Z1 direction. The first case 54m defines a first common liquid chamber portion UR1, which is part of the upstream common liquid chamber UR. The first case 54m is provided with an opening h31, a first common liquid chamber portion UR1 that communicates with the multiple nozzles N of the first nozzle row L1, and a first common liquid chamber portion UR1 that communicates with the multiple nozzles N of the second nozzle row L2. The opening h31 is a hole through which the wiring board 54i passes. The first common liquid chamber portion UR1 is an elongated through-hole that extends in the direction along the Y axis in a plan view seen in the direction along the Z axis. In the following description, the first common liquid chamber portion UR1 included in the common liquid chamber R[L1] may be referred to as the first common liquid chamber portion UR1[L1], and the first common liquid chamber portion UR1 included in the common liquid chamber R[L2] may be referred to as the first common liquid chamber portion UR1[L2]. The first common liquid chamber portion UR1 is formed by penetrating the first case 54m in the direction along the Z axis.

[0058] The first case 54m is provided in the first common liquid chamber UR1 and has a case beam BR1 extending in the direction along the X-axis. In the following description, the case beam BR1 provided in the first common liquid chamber UR1[L1] may be referred to as the case beam BR1[L1], and the case beam BR1 provided in the first common liquid chamber UR1[L2] may be referred to as the case beam BR1[L2]. The case beam BR1 is an example of a "first beam." As shown in FIG. 4, three case beams BR1[L1] are provided in the first common liquid chamber UR1[L1], and three case beams BR1[L2] are provided in the first common liquid chamber UR1[L2]. That is, three case beam portions BR1 are provided corresponding to the first nozzle row L1 and the second nozzle row L2, respectively, but one may be provided corresponding to the first nozzle row L1 and the second nozzle row L2, or a number other than three may be provided.

[0059] The first case 54m has four side walls w31 arranged along the X-axis. The four side walls w31 include two side walls w31[L1] that define the first common liquid chamber portion UR1[L1] and two side walls w31[L2] that define the first common liquid chamber portion UR1[L2]. Each of the four side walls w31 has a notch k32 in the wall surface that does not define the first common liquid chamber portion UR1. The adhesive 70 used to bond the first case 54m and the filter 54o flows into the notch k32. This prevents excess adhesive 70 from moving into the filter hole h23, thereby preventing the filter hole h23 from becoming clogged.

[0060] The second case 54n is a member laminated on the surface of the first case 54m facing the Z1 direction. The second case 54n defines a second common liquid chamber portion UR2, which is a part of the upstream common liquid chamber UR. The second case 54n is provided with an opening h41 and a plurality of connection ports IO for allowing ink to flow into each common liquid chamber R from the liquid storage portion 10 located outside the head chip 54 and outside the liquid jet head 50, or for allowing ink to flow out from each common liquid chamber R to the outside of the liquid jet head 50. The second common liquid chamber portion UR2 is formed by recessing from the surface SZ2 in the Z1 direction. The surface SZ2 is the surface of the second case 54n that is joined to the surface SZ1 of the first case 54m.

[0061] The second case 54n has four side walls w44 arranged along the X-axis. The four side walls w44 are two side walls w44[L1] that define the second common liquid chamber portion UR2[L1] and two side walls w44[L2] that define the second common liquid chamber portion UR2[L2]. Each of the four side walls w44 has a notch k45 on a wall surface that does not define the second common liquid chamber portion UR2. The adhesive 71 used to bond the first case 54m and the second case 54n flows into the notch k45, thereby preventing the adhesive 71 from flowing into the common liquid chamber R compared to an embodiment without the notch k45.

[0062] Like the support plate 52c, the first case 54m and the second case 54n are made of a resin material such as modified polyphenylene ether resin, polyphenylene sulfide resin, or polypropylene resin. The first case 54m and the second case 54n are manufactured by, for example, injection molding. Specifically, the manufacturer injects molten resin material into a mold having cavities of the same shapes as the first case 54m and the second case 54n, hardens the resin material in the cavities, and then removes the mold from the hardened resin material.

[0063] Fig. 7 is a cross-sectional view taken along CC in Fig. 5. As can be seen from Fig. 7, when viewed in the Z2 direction, the area r38 of the portion of the surface SZ1 of the first case 54m facing the Z1 direction that defines the second common liquid chamber portion UR2 is larger than the area r39 of the opening formed in the surface SZ1 to define the first common liquid chamber portion UR1.

[0064] As shown in FIG. 5, the second common liquid chamber UR2 is located further in the Z1 direction than the piezoelectric element 54f. The width dx2 of the second common liquid chamber UR2 along the X axis is longer than the width dx1 of the first common liquid chamber UR1 along the X axis. The width dx1 is, for example, approximately 0.58 mm. As shown in FIG. 5, the first common liquid chamber UR1 does not overlap the protective substrate 54g when viewed in the Z2 direction. On the other hand, the second common liquid chamber UR2 overlaps the protective substrate 54g when viewed in the Z2 direction. Two objects overlapping means that part or all of one object overlaps part or all of the other object. In the example of FIG. 5, the second common liquid chamber UR2 overlaps the piezoelectric element 54f when viewed in the Z2 direction. However, the second common liquid chamber UR2 does not have to overlap the piezoelectric element 54f when viewed in the Z2 direction. 5, the first common liquid chamber UR1 overlaps with the protective substrate 54g when viewed along the X axis, while the second common liquid chamber UR2 does not overlap with the protective substrate 54g when viewed along the X axis.

[0065] The vibration absorber 54d, also referred to as a compliance substrate, is a flexible resin film that forms the wall surface of the common liquid chamber R and absorbs pressure fluctuations of the ink in the common liquid chamber R. The vibration absorber 54d may also be a flexible thin metal plate. The surface of the vibration absorber 54d facing the Z1 direction is bonded to the communication plate 54a with an adhesive or the like. Meanwhile, a frame 54k is bonded to the surface of the vibration absorber 54d facing the Z2 direction with an adhesive or the like. The frame 54k is a frame-shaped member that fits along the outer periphery of the vibration absorber 54d and comes into contact with the aforementioned fixing plate 55. Here, the frame 54k is made of a metal material such as stainless steel, aluminum, titanium, or a magnesium alloy.

[0066] The wiring board 54i is mounted on the surface of the diaphragm 54e facing the Z1 direction and is a mounting component for electrically connecting the control unit 20 and the head chip 54. The wiring board 54i is a flexible wiring board such as a COF (Chip On Film), an FPC (Flexible Printed Circuit), or an FFC (Flexible Flat Cable). In this embodiment, a drive circuit 54j for supplying a drive voltage to each piezoelectric element 54f is mounted on the wiring board 54i. The drive circuit 54j is a circuit that switches whether or not to supply at least a portion of the waveform included in the drive signal Com as a drive pulse based on the control signal S.

[0067] 1-5. Regarding the first case 54m and the second case 54n The reason why the case defining the upstream common liquid chamber UR in the first embodiment is divided into a first case 54m and a second case 54n will be explained. Providing a filter 54o in the common liquid chamber R increases the flow path resistance within the common liquid chamber R. As the flow path resistance increases, the energy required to supply ink to the nozzles N increases, resulting in increased power consumption by the liquid jet head 50. Therefore, it is preferable to reduce the flow path resistance. One method for reducing the flow path resistance within the common liquid chamber R is to increase the volume of the common liquid chamber R. However, as shown in FIG. 5, if the common liquid chamber R is extended in the Z1 direction while maintaining the width of the first common liquid chamber portion UR1 along the X axis due to the layout of the case and the protective substrate 54g, the head chip 54 will become larger in the direction along the Z axis. On the other hand, it is also possible to extend the common liquid chamber R into the space in the Z1 direction of the protective substrate 54g, but in one case, when viewed from the direction along the X axis, it is difficult to manufacture by injection molding a complex shape in which the width of the common liquid chamber R is narrow in the area that overlaps with the protective substrate 54g and the width of the common liquid chamber R is wide in the area that does not overlap with the protective substrate 54g. More specifically, injection molding includes a step of removing the mold from the cured resin material, but if there is a portion where the cured resin material engages with the mold in the direction of mold removal, it becomes difficult to remove the mold from the cured resin material.

[0068] Therefore, as shown in the first embodiment, the case that defines the upstream common liquid chamber UR is divided into a first case 54m and a second case 54n. As can be seen from Fig. 5, the mold for the first case 54m and the mold for the second case 54n can be easily removed in the Z2 direction, which makes it easy to manufacture the first case 54m and the second case 54n while increasing the volume of the common liquid chamber R.

[0069] Dividing the case defining the upstream common liquid chamber UR into the first case 54m and the second case 54n results in a phenomenon in which the rigidity of the first case 54m is reduced compared to the rigidity of the second case 54n. The second case 54n has an outer wall in the Z1 direction, allowing it to maintain a certain degree of rigidity. On the other hand, the first case 54m has a long opening extending along the Y axis due to the formation of the first common liquid chamber UR1, resulting in reduced rigidity. If the rigidity of the first case 54m is reduced, the first case 54m may be deformed, for example, due to pressure applied when curing an adhesive. Therefore, in the first embodiment, a case beam BR1 is provided along the X axis, which intersects with the Y axis, to prevent a decrease in the rigidity of the first case 54m. However, if the case beam BR1 contacts the filter 54o, some of the filter holes h23 are blocked by the case beam BR1, reducing the effective area of ​​the filter hole region FR. Furthermore, since no ink flows between the case beam portion BR1 and the filter 54o, there are areas where air bubbles can accumulate. In the first embodiment, the case beam portion BR1 is provided, but the areas where air bubbles can accumulate are suppressed.

[0070] 1-6. Details of case beam BR1 and connecting plate beam BR2 The case beam BR1 is spaced apart from the filter 54o. Specifically, in the direction along the Z axis, the case beam BR1 is spaced a distance dz1 from the filter 54o. The distance dz1 is the distance from the filter 54o to the bottom surface of the case beam BR1. The dimension of the case beam BR1 in the direction along the Z axis is a distance dz2. The dimension of the first case 54m in the direction along the Z axis is a distance dz3. The sum of the distances dz1 and dz2 is equal to the distance dz3. The distance dz2 is approximately half of the distance dz3. Specifically, approximately half of the distance dz3 is 40% to 60% of the distance dz3. Preferably, approximately half of the distance dz3 is 45% to 55% of the distance dz3, and more preferably 49% to 51% of the distance dz3. The distance dz1 is, for example, approximately 0.60 mm.

[0071] 6, the case beam portion BR1 and the communicating plate beam portion BR2 are arranged offset in the direction along the Y axis so as not to overlap when viewed in the Z2 direction. Specifically, in the direction along the Y axis, the case beam portion BR1 that is closest to the communicating plate beam portion BR2 among the three case beam portions BR1 is separated by a distance dy1 from the communicating plate beam portion BR2.

[0072] As shown in FIG. 6, the surface SB1 of the case beam BR1 facing the second case 54n is flush with the surface SZ1 of the first case 54m facing the second case 54n. Being flush means that there is no step between the two surfaces. The surface SB1 is an example of a "surface of the first beam facing the second case." The surface SZ1 is an example of a "surface of the first case joined to the second case." Note that the surface SB1 can be considered a part of the surface SZ1. Meanwhile, the Z2-direction surface of the case beam BR1 is a tapered surface whose width along the Y-axis narrows as it approaches the Z2 direction. In the example of FIG. 6, the Z2-direction surface of the case beam BR1, when viewed along the X-axis, is semicircular and protrudes in the Z2 direction. However, it may also be trapezoidal, with its upper edge in the Z2 direction.

[0073] As shown in FIG. 6, the surface SB2 of the communicating plate beam portion BR2 in the Z1 direction is flush with the surface SZ3 of the communicating plate 54a in the Z1 direction.

[0074] As shown in FIG. 6, some filter holes h23f out of the plurality of filter holes h23 are formed in the portion of the filter 54o that is stacked on the communicating plate beam portion BR2.

[0075] In the direction along the Y axis, the outer shape of the filter 54o is the same as or smaller than the outer shapes of the first case 54m and the second case 54n, and is larger than the outer shape of the communicating plate 54a. In the example of Fig. 6, in the direction along the Y axis, the outer shape of the filter 54o is smaller than the outer shape of the second case 54n. As can be seen from Figs. 5 and 6, when viewed in the Z2 direction, the outer shape of the filter 54o is the same as or smaller than the outer shape of the second case 54n, and is larger than the outer shape of the communicating plate 54a.

[0076] 6, the second case 54n has two side walls w47 that define a second common liquid chamber UR2 and are arranged in the direction along the Y axis of the second case 54n. The two side walls w47 are a side wall w47 arranged in the Y2 direction and a side wall w47 arranged in the Y1 direction. The tapered surface t48 of the side wall w47 arranged in the Y2 direction moves away from the connection port IO in the Y2 direction as it moves in the Z2 direction from the connection port IO. The tapered surface t48 of the side wall w47 arranged in the Y1 direction moves away from the connection port IO in the Y1 direction as it moves in the Z2 direction from the connection port IO.

[0077] 1-7. Summary of the first embodiment The liquid jet head 50 includes a first nozzle array L1, a second nozzle array L2, a piezoelectric element 54f, and multiple laminated components. The first nozzle array L1 and the second nozzle array L2 are configured by arranging multiple nozzles N, which eject ink in the Z2 direction, in a direction along the Y axis perpendicular to the Z2 direction. The piezoelectric element 54f ejects ink from the multiple nozzles N of the first nozzle array L1 and the second nozzle array L2. The multiple laminated components define a common liquid chamber R that communicates with the multiple nozzles N of the first nozzle array L1 and the second nozzle array L2. The multiple laminated components include a filter 54o, a first case 54m, and a second case 54n. The filter 54o divides the common liquid chamber R into an upstream common liquid chamber UR and a downstream common liquid chamber DR. The first case 54m defines a first common liquid chamber portion UR1, which is part of the upstream common liquid chamber UR, and is laminated on the filter 54o. The second case 54n defines a second common liquid chamber portion UR2, which is part of the upstream common liquid chamber UR, and is stacked on the first case 54m. The second common liquid chamber portion UR2 is located in the Z1 direction relative to the piezoelectric element 54f. The width dx2 of the second common liquid chamber portion UR2 along the X axis is longer than the width dx1 of the first common liquid chamber portion UR1 along the X axis. According to the first embodiment, even if the upstream common liquid chamber UR has a complex shape, in which the width of the upstream common liquid chamber UR in the region overlapping with the protective substrate 54g is narrow and the width of the upstream common liquid chamber UR in the region not overlapping with the protective substrate 54g is wide, it can be manufactured more easily than in an embodiment in which a single case is manufactured to define the upstream common liquid chamber UR. Therefore, the width of the head chip 54 in the direction along the Z axis can be made smaller compared to an embodiment in which the common liquid chamber R is extended in the Z1 direction while maintaining the width of the first common liquid chamber portion UR1 along the X axis, thereby ensuring the same volume as the common liquid chamber of the first embodiment. Because the width of the head chip 54 in the direction along the Z axis can be made smaller, the width of the liquid jet head 50 in the direction along the Z axis can also be made smaller.

[0078] The liquid jet head 50 further includes a protective substrate 54g that covers the piezoelectric elements 54f. The first common liquid chamber UR1 overlaps with the protective substrate 54g when viewed along the X-axis, but does not overlap with the protective substrate 54g when viewed in the Z2 direction. The second common liquid chamber UR2 does not overlap with the protective substrate 54g when viewed along the X-axis, but overlaps with the protective substrate 54g when viewed in the Z2 direction. According to the first embodiment, compared to the configuration in which the second common liquid chamber portion UR2 does not overlap with the protective substrate 54g when viewed in the Z2 direction, the common liquid chamber R can be enlarged while maintaining the outer shape of the second case 54n not to be larger than the outer shape of the first case 54m when viewed in the Z2 direction.

[0079] The first common liquid chamber UR1 is formed by penetrating the first case 54m in the Z2 direction. The second common liquid chamber UR2 is formed by recessing the surface SZ2 of the second case 54n in the Z1 direction. The first case 54m is provided within the first common liquid chamber UR1 and has a case beam BR1 extending in the direction along the X-axis. The case beam BR1 is disposed at a distance from the filter 54o. According to the first embodiment, the first case 54m has reduced rigidity compared to the second case 54n, which has an outer wall in the Z1 direction, but the case beam BR1 can suppress this reduction in rigidity. Furthermore, because the case beam BR1 is spaced apart from the filter 54o, ink can pass between the case beam BR1 and the filter 54o, making it easier to expel air bubbles. Furthermore, because the X2-direction surface of the case beam BR1 is tapered, air bubbles can move more easily in the Z1 direction, making it easier to expel air bubbles compared to an embodiment in which the X2-direction surface of the case beam BR1 is not tapered.

[0080] A surface SB1 of the case beam portion BR1 facing the second case 54n is flush with a surface SZ1 of the first case 54m that is joined to the second case 54n. In an embodiment in which the surface SB1 is not flush with the surface SZ1, i.e., in an embodiment in which the surface SB1 is stepped from the surface SZ1, the first case 54m must be manufactured so that a step is provided on the surface in the Z1 direction of the first case 54m. On the other hand, in an embodiment in which the surface SB1 is flush with the surface SZ1, a step is not required on the surface in the Z1 direction of the first case 54m, making manufacturing the first case 54m easier. Furthermore, in an embodiment in which the surface SB1 is flush with the surface SZ1, the distance from the case beam BR1 to the filter 54o can be increased, assuming that the width of the case beam BR1 in the Z-axis direction is the same, compared to an embodiment in which the surface SB1 is positioned further away from the surface SZ1 in the Z2 direction. Increasing the distance from the case beam BR1 to the filter 54o facilitates the passage of ink between the case beam BR1 and the filter 54o, thereby facilitating the removal of air bubbles.

[0081] A distance dz2, which is the dimension of the case beam portion BR1 in the Z2 direction, is approximately half of a distance dz3, which is the dimension of the first case 54m in the Z2 direction. Increasing the distance dz2 increases the rigidity of the first case 54m, but reduces the ability of ink to pass between the case beam BR1 and the filter 54o, making it difficult to expel air bubbles. On the other hand, shortening the distance dz2 makes it easier to expel air bubbles, but reduces the rigidity of the first case 54m. According to the first embodiment, the distance dz2 is approximately half the distance dz3, which maintains a certain level of rigidity of the first case 54m while also preventing air bubbles from becoming difficult to expel. Furthermore, when the distance dz1 from the filter 54o to the bottom surface of the case beam BR1 is equal to or greater than the width dx1 of the first common liquid chamber UR1 along the X axis, the effect of pressure loss due to the provision of the case beam BR1 can be reduced. In the first embodiment, the distance dz1 is 0.60 mm and the width dx1 is 0.58 mm, which reduces the effect of pressure loss due to the provision of the case beam BR1 compared to an embodiment in which the distance dz1 is shorter than the width dx1. Furthermore, it is preferable that the distance dz1 from the filter 54o to the bottom surface of the case beam portion BR1 is equal to or greater than the width dy2 of the first common liquid chamber portion UR1 in the direction along the Y axis.

[0082] The multiple laminated members that define the common liquid chamber R further include a communicating plate 54a that defines a portion of the downstream common liquid chamber DR. The communicating plate 54a has a communicating plate beam portion BR2 that extends in the direction along the X-axis. The case beam portion BR1 and the communicating plate beam portion BR2 are offset in the direction along the Y-axis so that they do not overlap when viewed in the Z2 direction. When the case beam portion BR1 and the communicating plate beam portion BR2 overlap as viewed in the Z2 direction, ink is less likely to flow into the nozzles N that are located at the same positions as the case beam portion BR1 and the communicating plate beam portion BR2 in the direction along the Y axis. Furthermore, when the case beam portion BR1 and the communicating plate beam portion BR2 overlap as viewed in the Z2 direction, the gap between the case beam portion BR1 and the communicating plate beam portion BR2 is narrowed, making it difficult for ink to flow and therefore difficult to expel air bubbles. Therefore, according to the first embodiment, compared to the configuration in which the case beam portion BR1 and the communicating plate beam portion BR2 overlap as viewed in the Z2 direction, it is less likely that a nozzle N will be created that has difficulty in allowing ink to flow, and it is also easier to expel air bubbles.

[0083] The filter 54o is stacked on the communication plate 54a. The filter 54o has a plurality of filter holes h23 formed therein, through which ink passes. Some of the filter holes h23, namely, filter holes h23f, are formed in the portion of the filter 54o stacked on the communication plate beam portion BR2. According to the first embodiment, the filter 54o is easier to manufacture than in a mode in which the filter holes h23 are formed in a manner that avoids the portion of the filter 54o that is stacked on the communicating plate beam portion BR2.

[0084] The second case 54n has a sidewall w44 that defines the second common liquid chamber portion UR2 and is arranged in the direction along the Y axis of the second case 54n, and a connection port IO that is arranged in the Z1 direction from a surface SZ2 of the second case 54n that is joined to the first case 54m, and that allows ink to flow in from outside the liquid jet head 50. The sidewall w44 defines the second common liquid chamber portion UR2 and has a tapered surface t48 that moves away from the connection port IO in the direction along the Y axis as it moves in the Z2 direction from the connection port IO. According to this embodiment, the wall thickness of the second case 54n in the Z1 direction can be increased, assuming the volume of the second common liquid chamber portion UR2 is the same, compared to an embodiment in which the side wall w44 does not have the tapered surface t48. Furthermore, according to this embodiment, the volume of the second common liquid chamber portion UR2 can be increased, compared to an embodiment in which the side wall w44 does not have the tapered surface t48 and the wall thickness of the second case 54n in the Z1 direction is maintained all the way to the end in the Z2 direction.

[0085] When viewed in the Z2 direction, the area r38 of the portion of the surface SZ1 that is joined to the second case 54n of the first case 54m and that defines the second common liquid chamber portion UR2 is larger than the area r39 of the opening formed in the surface SZ1 that is joined to the second case 54n of the first case 54m to define the first common liquid chamber portion UR1.

[0086] The first case 54m and the second case 54n are made of a resin material. Resin materials are generally characterized by their light weight and ease of processing compared to metals and ceramics. However, when components are made of resin, it is difficult to form complex shapes. However, in the first embodiment, by dividing the first case 54m and the second case 54n into two components, it is possible to easily manufacture a case that defines the upstream common liquid chamber UR having a complex shape while increasing the volume of the upstream common liquid chamber UR. Furthermore, although components made of resin have lower rigidity compared to components made of metal or ceramics, the case beam BR1 can prevent a decrease in the rigidity of the first case 54m.

[0087] When viewed in the Z2 direction, the outer shape of the filter 54o is the same as or smaller than the outer shape of the second case 54n, and is larger than the outer shape of the communication plate 54a. According to the first embodiment, the rigidity of the filter 54o can be increased compared to an embodiment in which the outer shape of the filter 54o is the same as the outer shape of the communicating plate 54a when viewed in the Z2 direction. However, if the outer shape of the filter 54o is larger than the outer shape of the second case 54n when viewed in the Z2 direction, the outer shape of the liquid jet head 50 in a direction perpendicular to the Z axis becomes larger. Therefore, according to the first embodiment, the rigidity of the filter 54o can be increased while maintaining the outer shape of the liquid jet head 50 in a direction perpendicular to the Z axis, compared to an embodiment in which the outer shape of the filter 54o is the same as the outer shape of the communicating plate 54a when viewed in the Z2 direction.

[0088] The liquid ejection device 100 includes a liquid ejection head 50 and a liquid storage unit 10 that stores liquid to be supplied to the liquid ejection head 50. According to the first embodiment, even when the filter 54o is provided in the common liquid chamber R, it is possible to provide a liquid ejecting device 100 that suppresses an increase in ink pressure loss.

[0089] 2. Variations The above-described embodiments can be modified in various ways. Specific modifications are exemplified below. Two or more embodiments selected from the following examples can be combined as long as they are not mutually contradictory.

[0090] 2.1. First Modification In the first embodiment, the filter 54o is laminated on the communication plate 54a, but this is not limiting. In the first modified example, a spacer 54p is provided between the communication plate 54a and the filter 54o.

[0091] Fig. 8 is an exploded perspective view of head chip 54A in the first modified example, Fig. 9 is a cross-sectional view taken along line DD in Fig. 8, and Fig. 10 is a cross-sectional view taken along line EE in Fig. 8.

[0092] Head chip 54A differs from head chip 54 in that it has a spacer 54p. As shown in Figures 8 to 10, spacer 54p is laminated on communication plate 54a. Filter 54o is laminated on spacer 54p.

[0093] The spacer 54p is used to ensure a space between the filter hole h23 and the communication plate 54a. The spacer 54p is made of metal or ceramics. In the first modified example, the communication plate 54a and the spacer 54p define a part of the downstream common liquid chamber DR.

[0094] As shown in FIG. 8 , the spacer 54p has an opening h61 and two through holes SR. The opening h61 is a through hole through which the pressure chamber substrate 54b passes. One of the two through holes SR communicates with some or all of the filter holes h23[L1]. The other of the two through holes SR communicates with some or all of the filter holes h23[L2]. Hereinafter, the through hole SR that communicates with some or all of the filter holes h23[L1] may be referred to as the through hole SR[L1], and the through hole SR that communicates with some or all of the filter holes h23[L2] may be referred to as the through hole SR[L2]. To increase the effective area of ​​the filter hole region FR, it is preferable that the through hole SR[L1] communicates with all of the filter holes h23[L1] and the through hole SR[L2] communicate with all of the filter holes h23[L2]. As shown in FIG. 10, when viewed in the Z2 direction, among the plurality of filter holes h23, the filter holes h23f that overlap with the communicating plate beam portion BR2 overlap with the through-holes SR.

[0095] As described above, in the first modified example, the multiple laminated components that define the common liquid chamber R further include a spacer 54p that defines a portion of the downstream common liquid chamber DR. The filter 54o is laminated on the spacer 54p. The filter 54o has multiple filter holes h23f formed therein through which ink passes. The spacer 54p is laminated on the communicating plate 54a. The spacer 54p is made of metal or ceramics. The spacer 54p has through holes SR formed by penetrating the spacer 54p in the Z2 direction. When viewed in the Z2 direction, the filter holes h23f that overlap with the communicating plate beam portion BR2 of the multiple filter holes h23f overlap with the through holes SR. Because the spacer 54p is made of metal or ceramic, which has higher rigidity than resin material, deformation of the spacer 54p can be suppressed compared to an embodiment in which the spacer 54p is made of resin material. Furthermore, the through-holes SR ensure space between the communicating plate beam portion BR2 and the filter holes h23f, which prevents the filter holes h23f from being blocked. Therefore, the effective area of ​​the filter hole region FR can be prevented from being narrowed.

[0096] 2.2. Second Modification In each of the above-described embodiments, the surface SB1 of the case beam portion BR1 facing the second case 54n is flush with the surface SZ1 of the first case 54m facing the second case 54n, but the surface SB1 may be located in the Z2 direction from the surface SZ1.

[0097] 2.3.Third Modification In each of the above-described embodiments, the distance dz2, which is the dimension of the case beam portion BR1 in the Z2 direction, is approximately half the distance dz3, which is the dimension of the first case 54m in the Z2 direction, but is not limited to this. For example, the distance dz2 may be shorter than approximately half the distance dz3. In this case, it is preferable that the first case 54m be made of metal or ceramic, which has higher rigidity than resin material. Alternatively, the distance dz2 may be longer than approximately half the distance dz3.

[0098] 2.4. Fourth Variant In each of the above-described embodiments, the communicating plate 54a is provided with the communicating plate beam portion BR2, but the communicating plate beam portion BR2 does not have to be provided.

[0099] 2.5. Fifth Variant In each of the above-described embodiments, the side wall w47 of the second case 54n has the tapered surface t48, but it does not have to have the tapered surface t48.

[0100] 2.6. Sixth Variant In each of the above-described embodiments, the area r38 of the surface SZ1 of the first case 54m that is joined to the second case 54n is larger than the area r39 of the opening formed in the surface SZ1 of the first case 54m that is joined to the second case 54n when viewed in the Z2 direction, but this is not limited to this. For example, the area r38 may be the same size as or smaller than the area r39.

[0101] 2.7. Seventh Variant In each of the above-described embodiments, the first case 54m has the case beam BR1, but it does not have to have the case beam BR1. For example, the first case 54m may be made of metal or ceramic instead of a resin material, so that the first case 54m has enough rigidity to suppress deformation when pressure is applied after adhesive is applied, even if it does not have the case beam BR1. Furthermore, the second case 54n may also be made of metal or ceramic instead of a resin material.

[0102] 2.8. Eighth Variant In each of the above-described embodiments, a serial-type liquid ejection device 100 that reciprocates a support 41 that supports the liquid ejection head 50 is exemplified, but the present invention can also be applied to a line-type liquid ejection device in which a plurality of nozzles N are distributed across the entire width of the medium M. In other words, the support that supports the liquid ejection head 50 is not limited to a serial-type carriage, and may be a structure that supports the liquid ejection head 50 in a line-type system. In this case, for example, a plurality of liquid ejection heads 50 are arranged side by side in the width direction of the medium M, and the plurality of liquid ejection heads 50 are collectively supported by a single support.

[0103] 2.9. Ninth Variant The liquid ejection apparatus exemplified in the above-described embodiment can be employed in various devices such as facsimile machines and copiers, as well as devices dedicated to printing. However, the uses of the liquid ejection apparatus are not limited to printing. For example, a liquid ejection apparatus that ejects a solution of a coloring material is used as a manufacturing apparatus for forming color filters for display devices such as liquid crystal display panels. Furthermore, a liquid ejection apparatus that ejects a solution of a conductive material is used as a manufacturing apparatus for forming wiring and electrodes on a wiring board. Furthermore, a liquid ejection apparatus that ejects a solution of an organic substance related to a living body is used as a manufacturing apparatus for manufacturing biochips, for example.

[0104] 3. Notes From the above-described exemplary embodiments, the following configurations can be understood, for example.

[0105] A preferred embodiment of the liquid jet head according to aspect 1 includes a nozzle array configured by arranging a plurality of nozzles that eject liquid in a first direction in a second direction perpendicular to the first direction, a drive element for ejecting liquid from the plurality of nozzles in the nozzle array, and a plurality of laminated components that define a common liquid chamber that communicates with the plurality of nozzles in the nozzle array, wherein the plurality of laminated components include a filter that divides the common liquid chamber into an upstream common liquid chamber and a downstream common liquid chamber, a first case that defines a first common liquid chamber portion that is part of the upstream common liquid chamber and is laminated on the filter, and a second case that defines a second common liquid chamber portion that is part of the upstream common liquid chamber and is laminated on the first case, wherein the second common liquid chamber portion is located in a direction opposite to the first direction relative to the drive element, and the width of the second common liquid chamber portion in a third direction perpendicular to the first direction and the second direction is longer than the width of the first common liquid chamber portion in the third direction. According to the first aspect, even if the upstream common liquid chamber has a complex shape, in which the width of the common liquid chamber R in the region overlapping with the protective substrate is narrow and the width of the common liquid chamber in the region not overlapping with the protective substrate is wide, the upstream common liquid chamber can be manufactured more easily than in an aspect in which a single case defining the upstream common liquid chamber is manufactured. Therefore, the width of the liquid jet head in the first direction can be made smaller compared to an aspect in which the common liquid chamber is extended in the direction opposite to the first direction while maintaining the width of the first common liquid chamber portion in the third direction, thereby ensuring the same volume as the common liquid chamber of the first aspect.

[0106] In aspect 2, which is a specific example of aspect 1, the liquid crystal display device further includes a protective substrate that covers the driving element, wherein the first common liquid chamber portion overlaps with the protective substrate when viewed in the third direction but does not overlap with the protective substrate when viewed in the first direction, and the second common liquid chamber portion does not overlap with the protective substrate when viewed in the third direction but overlaps with the protective substrate when viewed in the first direction. According to aspect 2, compared to an aspect in which the second common liquid chamber portion does not overlap with the protective substrate when viewed in the first direction, the common liquid chamber R can be made larger while maintaining the outer shape of the second case not larger than the outer shape of the first case when viewed in the first direction.

[0107] In aspect 3, which is a specific example of aspect 1 or aspect 2, the first common liquid chamber portion is formed by penetrating the first case in the first direction, the second common liquid chamber portion is formed by recessing in a direction opposite to the first direction from the surface of the second case that is joined to the first case, the first case is provided within the first common liquid chamber portion and has a first beam portion that extends in the third direction, and the first beam portion is arranged at a distance from the filter. According to Aspect 3, the first case has reduced rigidity compared to the second case having an outer wall in the opposite direction to the first direction, but the first beam portion can suppress the reduction in rigidity. Furthermore, because the first beam portion is disposed at a distance from the filter, liquid can pass between the first beam portion and the filter, making it easier to expel air bubbles.

[0108] In Aspect 4, which is a specific example of Aspect 3, the surface of the first beam portion facing the second case is flush with the surface of the first case that is joined to the second case. In Example 4, in an example in which there is a step between the surface of the first beam portion facing the second case and the surface of the first case joined to the second case, it is necessary to manufacture the first case so that the step is provided on the surface of the first case opposite the first direction. On the other hand, in Example 4, there is no need to provide a step on the surface of the second case opposite the first direction, which makes it easier to manufacture the first case.

[0109] In Aspect 5, which is a specific example of Aspect 4, the dimension of the first beam portion in the first direction is approximately half the dimension of the first case in the first direction. Increasing the dimension of the first beam in the first direction can increase the rigidity of the first case, but it becomes more difficult for liquid to pass between the first beam and the filter, making it more difficult to expel air bubbles. On the other hand, shortening the dimension of the first beam in the first direction can make it easier to expel air bubbles, but the rigidity of the first case decreases. According to aspect 5, it is possible to prevent air bubbles from becoming more difficult to expel while maintaining a certain level of rigidity of the first case.

[0110] In aspect 6, which is a specific example of aspects 3 to 5, the multiple laminated components further include a communicating plate that defines a portion of the downstream common liquid chamber, the communicating plate having a second beam portion extending in the third direction, and the first beam portion and the second beam portion are arranged offset in the second direction so as not to overlap when viewed in the first direction. In an aspect in which the first beam portion and the second beam portion overlap when viewed in the first direction, it is difficult for liquid to flow into a nozzle located at the same position as the first beam portion and the second beam portion in the second direction. Furthermore, in an aspect in which the first beam portion and the second beam portion overlap when viewed in the first direction, the distance between the first beam portion and the second beam portion is narrower than in aspect 6, making it difficult for liquid to flow and therefore difficult to expel bubbles. According to aspect 6, it is possible to make it difficult for nozzles in which liquid has difficulty flowing to occur, and further to make it easier to expel bubbles, compared to an aspect in which the first beam portion and the second beam portion overlap when viewed in the first direction.

[0111] In aspect 7, which is a specific example of aspect 6, the filter is stacked on the communicating plate, and the filter has a plurality of holes through which liquid passes, and some of the plurality of holes are formed in the part of the filter that is stacked on the second beam portion. According to the seventh aspect, the filter can be manufactured more easily than in the aspect in which the holes are formed in a manner that avoids the portion of the filter that is stacked on the second beam portion.

[0112] In aspect 8, which is a specific example of aspect 6, the multiple laminated components further include a spacer that defines a portion of the downstream common liquid chamber, the filter is laminated on the spacer, and the filter has multiple holes through which liquid passes, the spacer is laminated on the communicating plate, the spacer is made of metal or ceramic, and the spacer has a through hole formed by penetrating the spacer in the first direction, and when viewed in the first direction, the hole among the multiple holes that overlaps with the second beam portion overlaps with the through hole. According to the eighth aspect, the spacer is made of metal or ceramic, which has higher rigidity than a resin material, and thus deformation of the spacer can be suppressed compared to the aspect in which the spacer is made of a resin material. Furthermore, the through-holes ensure a space between the second beam portion and the filter holes, which can suppress clogging of the filter holes. Therefore, the effective area of ​​the filter can be prevented from being reduced.

[0113] In aspect 9, which is a specific example of any one of aspects 1 to 8, the second case has a side wall that defines the second common liquid chamber and is arranged in the second direction of the second case, and a connection port that is arranged in the opposite direction of the first direction from the surface of the second case that is joined to the first case, for allowing liquid to flow in from the outside or out to the outside, and the side wall defines the second common liquid chamber and has a tapered surface that moves away from the connection port in the second direction as it moves toward the first direction from the connection port. According to aspect 9, the wall thickness of the second case in the direction opposite to the first direction can be made thicker, assuming the volume of the second common liquid chamber is the same, compared to an aspect in which the side wall does not have a tapered surface. Furthermore, according to aspect 9, the volume of the second common liquid chamber can be made larger, compared to an aspect in which the side wall does not have a tapered surface and the wall thickness of the second case in the direction opposite to the first direction is maintained up to the end in the first direction.

[0114] In aspect 10, which is a specific example of any one of aspects 1 to 9, when viewed in the first direction, the area of ​​the portion of the surface of the first case that is joined to the second case and that defines the second common liquid chamber is larger than the area of ​​the opening formed in the surface of the first case that is joined to the second case to define the first common liquid chamber.

[0115] In Aspect 11, which is a specific example of any one of Aspects 1 to 10, the first case and the second case are made of a resin material. Resin materials are generally characterized by being lightweight and easy to process compared to metals and ceramics. However, when components are made of resin materials, it is difficult to form complex shapes. However, in aspect 11, by dividing the first case and the second case into two components, it is possible to easily manufacture a case that defines an upstream common liquid chamber having a complex shape while increasing the volume of the upstream common liquid chamber. Furthermore, although components made of resin materials have lower rigidity than components made of metal or ceramics, the first beam portion can prevent the rigidity of the first case from decreasing.

[0116] In aspect 12, which is a specific example of any one of aspects 1 to 11, the multiple laminated components further include a communicating plate that defines at least a portion of the downstream common liquid chamber in the second direction and the third direction, and when viewed in the first direction, the outer shape of the filter is the same as or smaller than the outer shape of the second case and larger than the outer shape of the communicating plate. According to aspect 12, the rigidity of the filter can be increased compared to an aspect in which the outer shape of the filter is the same as the outer shape of the communicating plate when viewed in the first direction. However, if the outer shape of the filter is larger than the outer shape of the second case when viewed in the first direction, the outer shape of the liquid jet head in a direction perpendicular to the first direction will be larger. Therefore, according to aspect 12, the outer shape of the liquid jet head in a direction perpendicular to the first direction is maintained, while the rigidity of the filter can be increased compared to an aspect in which the outer shape of the filter is the same as the outer shape of the communicating plate when viewed in the first direction.

[0117] A liquid jet apparatus according to a thirteenth aspect, which is a preferred aspect, includes the liquid jet head according to any one of the first to twelfth aspects, and a liquid reservoir that stores liquid to be supplied to the liquid jet head. Even when a filter is provided in the common liquid chamber, it is possible to provide a liquid ejecting device 100 that suppresses an increase in pressure loss of the liquid. [Explanation of symbols]

[0118] 10...liquid storage section, 20...control unit, 30...transport mechanism, 40...movement mechanism, 41...support, 41a...opening, 41b...screw hole, 42...transport belt, 50...liquid ejection head, 51...flow path structure, 51a...flow path member, 51b...connection pipe, 51c...wiring hole, 52...substrate unit, 52a...circuit board, 52b...connector, 52c...support plate, 53...holder, 53a...recess, 53b...ink hole, 53c...wiring hole, 53d...recess, 53e...hole, 5 3i, 53k...screw holes, 54, 54A, 54_1, 54_2, 54_3, 54_4...head chip, 54a...communicating plate, 54b...pressure chamber substrate, 54c...nozzle plate, 54d...vibration absorber, 54e...diaphragm, 54f...piezoelectric element, 54g...protective substrate, 54i...wiring substrate, 54j...drive circuit, 54k...frame body, 54m...first case, 54n...second case, 54o...filter, 54p...spacer, 55...fixing plate, 55a...opening, 58...cover, 5 8a...through hole, 58b...opening, 100...liquid ejection device, BR1...case beam portion, BR2...communicating plate beam portion, CB...pressure chamber, Com...driving signal, DM...transport direction, DR...downstream common liquid chamber, DR1, DR2...opening, FN...nozzle surface, FR...filter hole area, IO...connection port, L1...first nozzle row, L2...second nozzle row, M...medium, N...nozzle, Na...communicating flow path, R...common liquid chamber, Ra...supply flow path, S...control signal, SB1, SB2...surface, SR...through hole Through hole, SZ1, SZ2, SZ3... surface, UR... upstream common liquid chamber, UR1... first common liquid chamber section, UR2... second common liquid chamber section, Xa... connecting flow path, dx1, dx2... width, dy1, dy2, dz1, dz2, dz3... distance, h1, h21... opening, h23, h23f... filter hole, h31... opening, h41... opening, h49... recess, h61... opening, k32, k45... notch, r38, r39... area, t48... tapered surface, w31, w44, w47... side wall.

Claims

1. a nozzle array configured by arranging a plurality of nozzles that eject liquid in a first direction in a second direction perpendicular to the first direction; a driving element for ejecting liquid from the plurality of nozzles of the nozzle row; a plurality of laminated components defining a common liquid chamber communicating with the plurality of nozzles of the nozzle row; Equipped with The plurality of laminate components include: a filter that divides the common liquid chamber into an upstream common liquid chamber and a downstream common liquid chamber; a first case that defines a first common liquid chamber portion that is a part of the upstream common liquid chamber and is laminated on the filter; a second case that defines a second common liquid chamber portion that is a part of the upstream common liquid chamber and is stacked on the first case; the second common liquid chamber is located in a direction opposite to the first direction relative to the drive element; a width of the second common liquid chamber portion in a third direction perpendicular to the first direction and the second direction is longer than a width of the first common liquid chamber portion in the third direction; the first common liquid chamber is formed by penetrating the first case in the first direction, the second common liquid chamber is formed by recessing a surface of the second case that is joined to the first case in a direction opposite to the first direction, the first case is provided in the first common liquid chamber and has a first beam portion extending in the third direction; The first beam portion is disposed at a distance from the filter. A liquid jet head characterized by:

2. A nozzle array configured by arranging a plurality of nozzles that spray liquid in a first direction in a second direction perpendicular to the first direction; a driving element for ejecting liquid from the plurality of nozzles of the nozzle row; a protection substrate having a recess formed therein to cover the driving element; a plurality of laminated components defining a common liquid chamber communicating with the plurality of nozzles of the nozzle row; Equipped with The plurality of laminate components include: a filter that divides the common liquid chamber into an upstream common liquid chamber and a downstream common liquid chamber; a first case that is a member different from the protection substrate, that defines a first common liquid chamber portion that is a part of the upstream common liquid chamber, and that is laminated on the filter; a second case that defines a second common liquid chamber portion that is a part of the upstream common liquid chamber and is stacked on the first case; the second common liquid chamber is located in a direction opposite to the first direction relative to the drive element; the first common liquid chamber portion overlaps with the protection substrate when viewed in a third direction perpendicular to the first direction and the second direction, and does not overlap with the protection substrate when viewed in the first direction; the second common liquid chamber does not overlap the protection substrate when viewed in the third direction, but overlaps the protection substrate when viewed in the first direction; a width in the third direction of the second common liquid chamber portion is greater than a width in the third direction of the first common liquid chamber portion; the first case has at least one first opening formed in a first surface of the first case joined to the second case to define the first common liquid chamber; the second case has at least one second opening formed in a second surface of the second case joined to the first case to define the second common liquid chamber; the first opening is directly connected to the second opening so that the first common liquid chamber communicates with the second common liquid chamber; A liquid jet head characterized by:

3. Further, a protection substrate covering the driving element is provided, the first common liquid chamber portion overlaps with the protection substrate when viewed in the third direction, but does not overlap with the protection substrate when viewed in the first direction; the second common liquid chamber does not overlap the protection substrate when viewed in the third direction, but overlaps the protection substrate when viewed in the first direction; The liquid jet head according to claim 1 .

4. the first common liquid chamber is formed by penetrating the first case in the first direction, the second common liquid chamber is formed by recessing a surface of the second case that is joined to the first case in a direction opposite to the first direction, the first case is provided in the first common liquid chamber and has a first beam portion extending in the third direction; The first beam portion is disposed at a distance from the filter. The liquid jet head according to claim 2 .

5. a surface of the first beam portion facing the second case is flush with a surface of the first case joined to the second case; The liquid jet head according to claim 1 .

6. a dimension of the first beam portion in the first direction is approximately half a dimension of the first case in the first direction; The liquid jet head according to claim 5 .

7. the plurality of stacked components further include a communication plate that defines a portion of the downstream common liquid chamber, the communicating plate has a second beam portion extending in the third direction, The first beam portion and the second beam portion are arranged to be shifted in the second direction so as not to overlap when viewed in the first direction. The liquid jet head according to claim 4 .

8. The filter is laminated on the communication plate, The filter has a plurality of holes formed therein through which a liquid passes, some of the holes are formed in a portion of the filter that is stacked on the second beam portion; The liquid jet head according to claim 7 .

9. the plurality of stacked components further include a spacer that defines a portion of the downstream common liquid chamber; the filter is laminated to the spacer; The filter has a plurality of holes formed therein through which a liquid passes, the spacer is laminated on the communicating plate, the spacer is made of metal or ceramic; the spacer has a through-hole formed by penetrating the spacer in the first direction, When viewed in the first direction, among the plurality of holes of the filter, a hole overlapping with the second beam portion overlaps with the through hole of the spacer. The liquid jet head according to claim 7 .

10. the second case has a sidewall that defines the second common liquid chamber and is disposed in the second direction of the second case, and a connection port that is disposed in a direction opposite to the first direction from a surface of the second case that is joined to the first case, and that is used to introduce liquid from the outside or to discharge liquid to the outside, the side wall defines the second common liquid chamber portion and has a tapered surface that moves away from the connection port in the second direction as it moves away from the connection port in the first direction; The liquid jet head according to claim 1 .

11. A nozzle array configured by arranging a plurality of nozzles that spray liquid in a first direction in a second direction perpendicular to the first direction; a driving element for ejecting liquid from the plurality of nozzles of the nozzle row; a plurality of laminated components defining a common liquid chamber communicating with the plurality of nozzles of the nozzle row; Equipped with The plurality of laminate components include: a filter that divides the common liquid chamber into an upstream common liquid chamber and a downstream common liquid chamber; a first case that defines a first common liquid chamber portion that is a part of the upstream common liquid chamber and is laminated on the filter; a second case that defines a second common liquid chamber portion that is a part of the upstream common liquid chamber and is stacked on the first case; the second common liquid chamber is located in a direction opposite to the first direction relative to the drive element; a width of the second common liquid chamber portion in a third direction perpendicular to the first direction and the second direction is longer than a width of the first common liquid chamber portion in the third direction; the second case has a sidewall that defines the second common liquid chamber and is disposed in the second direction of the second case, and a connection port that is disposed in a direction opposite to the first direction from a surface of the second case that is joined to the first case, and that is used to introduce liquid from the outside or to discharge liquid to the outside, the side wall defines the second common liquid chamber portion and has a tapered surface that moves away from the connection port in the second direction as it moves away from the connection port in the first direction; A liquid jet head characterized by:

12. an area of ​​a portion of a surface of the first case joined to the second case that defines the second common liquid chamber is larger than an area of ​​an opening formed in the surface of the first case joined to the second case for defining the first common liquid chamber, when viewed in the first direction; The liquid jet head according to claim 1 .

13. The first case and the second case are made of a resin material. The liquid jet head according to claim 1 .

14. A nozzle array configured by arranging a plurality of nozzles that spray liquid in a first direction in a second direction perpendicular to the first direction; a driving element for ejecting liquid from the plurality of nozzles of the nozzle row; a plurality of laminated components defining a common liquid chamber communicating with the plurality of nozzles of the nozzle row; Equipped with The plurality of laminate components include: a filter that divides the common liquid chamber into an upstream common liquid chamber and a downstream common liquid chamber; a first case that defines a first common liquid chamber portion that is a part of the upstream common liquid chamber and is laminated on the filter; a second case that defines a second common liquid chamber portion that is a part of the upstream common liquid chamber and is stacked on the first case; the second common liquid chamber is located in a direction opposite to the first direction relative to the drive element; a width of the second common liquid chamber portion in a third direction perpendicular to the first direction and the second direction is longer than a width of the first common liquid chamber portion in the third direction; The first case and the second case are made of a resin material. A liquid jet head characterized by:

15. A nozzle array configured by arranging a plurality of nozzles that spray liquid in a first direction in a second direction perpendicular to the first direction; a driving element for ejecting liquid from the plurality of nozzles of the nozzle row; a plurality of laminated components defining a common liquid chamber communicating with the plurality of nozzles of the nozzle row; Equipped with The plurality of laminate components include: a filter that divides the common liquid chamber into an upstream common liquid chamber and a downstream common liquid chamber; a first case that defines a first common liquid chamber portion that is a part of the upstream common liquid chamber and is laminated on the filter; a second case that defines a second common liquid chamber portion that is a part of the upstream common liquid chamber and is stacked on the first case; the second common liquid chamber is located in a direction opposite to the first direction relative to the drive element; a width of the second common liquid chamber portion in a third direction perpendicular to the first direction and the second direction is longer than a width of the first common liquid chamber portion in the third direction; the first common liquid chamber is formed by penetrating the first case in the first direction, the second common liquid chamber is formed by recessing a surface of the second case that is joined to the first case in a direction opposite to the first direction, the first case is made of metal, The second case is made of a resin material. A liquid jet head characterized by:

16. the plurality of stacked components further include a communication plate that defines at least a portion of the downstream common liquid chamber in the second direction and the third direction, When viewed in the first direction, the outer shape of the filter is equal to or smaller than the outer shape of the second case and is larger than the outer shape of the communication plate. The liquid jet head according to claim 1 .

17. A nozzle array configured by arranging a plurality of nozzles that spray liquid in a first direction in a second direction perpendicular to the first direction; a driving element for ejecting liquid from the plurality of nozzles of the nozzle row; a plurality of laminated components defining a common liquid chamber communicating with the plurality of nozzles of the nozzle row; Equipped with The plurality of laminate components include: a filter that divides the common liquid chamber into an upstream common liquid chamber and a downstream common liquid chamber; a first case that defines a first common liquid chamber portion that is a part of the upstream common liquid chamber and is laminated on the filter; a second case that defines a second common liquid chamber portion that is a part of the upstream common liquid chamber and is stacked on the first case; the second common liquid chamber is located in a direction opposite to the first direction relative to the drive element; a width of the second common liquid chamber portion in a third direction perpendicular to the first direction and the second direction is longer than a width of the first common liquid chamber portion in the third direction; the plurality of stacked components further include a communication plate that defines at least a portion of the downstream common liquid chamber in the second direction and the third direction, When viewed in the first direction, the outer shape of the filter is equal to or smaller than the outer shape of the second case and is larger than the outer shape of the communication plate. A liquid jet head characterized by:

18. the first case has at least one first opening formed in a first surface of the first case joined to the second case to define the first common liquid chamber; the second case has at least one second opening formed in a second surface of the second case joined to the first case to define the second common liquid chamber; the first opening is directly connected to the second opening so that the first common liquid chamber communicates with the second common liquid chamber; The liquid jet head according to claim 1 .

19. The liquid jet head according to any one of claims 1 to 18, a liquid storage section that stores the liquid to be supplied to the liquid jet head; A liquid ejection device comprising:

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