JP2018047600A - Flow passage member, liquid discharge head, liquid discharge device, and manufacturing method of the flow passage member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow passage member which can reduce a defect caused by a non-welded part (a sink), and provide a liquid discharge head, a liquid discharge device, and a manufacturing method of the flow passage member.SOLUTION: A flow passage member includes a first member (52) having a t thick part (54) and a thin part (55), a second member (53) laminated on the first member, a flow passage (57) defined by the first member and the second member, and a joint part (56) in which the first member and the second member are joined. The joint part includes a first joint part of which a distance from the thick part is relatively long, and a second joint part of which a distance from the thick part is relatively short. The first joint part defines the flow passage, and a ratio of a width of a non-joint part of the first joint part to a width of the first joint part is smaller than a ratio of a width of a non-joint part of the second joint part to a width of the second joint part.SELECTED DRAWING: Figure 13

Description

  The present invention relates to a flow path member through which a liquid discharged from a liquid discharge head such as an ink jet recording head flows, a liquid discharge head, a liquid discharge apparatus, and a method for manufacturing the flow path member.

  The liquid discharge apparatus includes a liquid discharge head, and discharges (sprays) various liquids from the liquid discharge head. As this liquid ejection device, for example, there is an image recording device such as an ink jet printer or an ink jet plotter. Recently, various types of manufacturing have been made by taking advantage of the ability to accurately land a very small amount of liquid on a predetermined position. It is also applied to devices. For example, a display manufacturing apparatus for manufacturing a color filter such as a liquid crystal display, an electrode forming apparatus for forming an electrode such as an organic EL (Electro Luminescence) display or FED (surface emitting display), a chip for manufacturing a biochip (biochemical element) Applied to manufacturing equipment. The recording head for the image recording apparatus ejects liquid ink, and the color material ejection head for the display manufacturing apparatus ejects a solution of each color material of R (Red), G (Green), and B (Blue). The electrode material discharge head for the electrode forming apparatus discharges a liquid electrode material, and the bioorganic discharge head for the chip manufacturing apparatus discharges a bioorganic solution.

  In the above-described liquid discharge apparatus, a flow path through which these fluids flow is formed in order to supply liquid to the liquid discharge head or to supply gas for adjusting the pressure of the liquid in the flow path. Some channel members are provided. For example, the flow path member (flow path structure) disclosed in Patent Document 1 has a plurality of synthetic resin flat plate-like first members and second members joined together in a laminated state, so that a plurality of them are internally provided. A flow path is formed. For bonding these substrates, for example, thermal welding using a laser, ultrasonic welding using ultrasonic waves, or the like is suitably used in addition to bonding with an adhesive.

JP-A-2015-174391

  However, when molding resin parts such as the first member and the second member constituting the above-mentioned flow path member, the surface is particularly thicker than the center portion or other portions of the product. A so-called sink in which a part of the dent is formed occurs. In the portion where the sink marks are formed on the joining surfaces of the parts, the adhesiveness of the resin parts is insufficient, and the joining may be insufficient. That is, a non-joined part may occur in the joint surface. For example, in the case where sink marks occur at the peripheral joint portion that defines the liquid flow path, there is a problem in that liquid leaks from a portion where the joint is insufficient.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a flow path member, a liquid discharge head, a liquid discharge device, and a flow that can reduce problems caused by non-joining portions due to sink marks or the like. A method for manufacturing a road member is provided.

The present invention has been proposed in order to achieve the above object, and includes a first member having a thick part and a thin part,
A second member laminated to the first member;
A flow path defined by the first member and the second member;
A joined portion in which the first member and the second member are joined;
With
The joint includes a first joint having a relatively long distance from the thick part and a second joint having a relatively short distance from the thick part,
The first joint defines the flow path;
The ratio of the width of the non-joined portion in the first joint portion to the width of the first joint portion is smaller than the proportion of the width of the non-joint portion in the second joint portion to the width of the second joint portion. It is characterized by.

  According to the present invention, since there are a plurality of joint portions in which the proportion of the non-joining portion varies depending on the distance from the thick-walled portion, it is possible to use and layout the flow path in which the non-joining portion is less problematic.

Moreover, in the said structure, the said thick part and the said thin part are arrange | positioned along a 1st direction in the said 1st member,
It is desirable that the first joint portion and the second joint portion are disposed along the first direction in the first member.

  According to this configuration, since the alignment direction of the thick portion and the thin portion and the alignment direction of the first joint portion and the second joint portion are aligned, the portion where the non-joint portion is liable to be clarified becomes clear. And the layout of the joint becomes easier. Moreover, it is easy to change the distance between the thick part and the first welded part according to the distance between the thick part and the second welded part where the non-joined part is likely to occur.

The present invention also includes a first member,
A second member laminated to the first member;
A flow path defined by the first member and the second member;
A joined portion in which the first member and the second member are joined;
With
The first member has a joint projecting from the one surface that communicates with the flow path,
The joint includes a first joint having a relatively long distance from the joint and a second joint having a relatively short distance from the joint,
The ratio of the width of the non-joined portion in the first joint portion to the width of the first joint portion is smaller than the proportion of the width of the non-joint portion in the second joint portion to the width of the second joint portion. It is characterized by.

  According to the present invention, since there are a plurality of joint portions in which the proportion of the non-joining portion varies depending on the distance from the joint, it is possible to use and layout the flow path in which the non-joining portion is less problematic.

Moreover, in the said structure, the said joint and the part which does not have the said joint are arrange | positioned along a 1st direction in the said 1st member,
It is desirable that the first joint portion and the second joint portion are disposed along the first direction in the first member.

  According to this configuration, since the alignment direction of the joint and the portion having no joint is aligned with the alignment direction of the first joint portion and the second joint portion, the portion where the non-joint portion is likely to occur is clarified. In addition, the layout of the flow path and the joint becomes easier. In addition, the distance between the joint and the first welded portion can be easily changed according to the distance between the joint and the second welded portion where non-joined portions are likely to occur.

The present invention also includes a first member,
A second member laminated to the first member;
A flow path defined by the first member and the second member;
A joined portion in which the first member and the second member are joined;
With
The joint includes, in the first member, a plurality of first joints and a second joint located between the plurality of first joints,
The ratio of the width of the non-joined portion in the first joint portion to the width of the first joint portion is smaller than the proportion of the width of the non-joint portion in the second joint portion to the width of the second joint portion. It is characterized by.

  According to the present invention, since there are a plurality of first joint portions and a second joint portion in which the non-joint portion occupies a different proportion from the first joint portion, the usage of the flow path where the non-joint portion is less problematic Layout becomes possible.

Further, the present invention provides a first member having a housing portion that houses a fixing member for fixing the flow path member,
A second member laminated to the first member;
A flow path defined by the first member and the second member;
A joined portion in which the first member and the second member are joined;
With
The joint includes a first joint having a relatively long distance from the housing and a second joint having a relatively short distance from the housing,
The ratio of the width of the non-joined portion in the first joint portion to the width of the first joint portion is smaller than the proportion of the width of the non-joint portion in the second joint portion to the width of the second joint portion. It is characterized by.

  According to the present invention, since the plurality of first joint portions and the second joint portions arranged between the first joint portions and having different ratios occupied by the non-joint portions, the non-joint portions are less likely to be a problem. Road usage and layout are possible.

Moreover, in the said method, the said accommodating part and the part which does not have the said accommodating part are arrange | positioned along a 1st direction in the said 1st member,
It is desirable that the first joint portion and the second joint portion are disposed along the first direction in the first member.

  According to this method, since the alignment direction of the accommodating portion and the portion not having the accommodating portion and the alignment direction of the first bonding portion and the second bonding portion are aligned, the portion where the non-bonding portion is likely to occur is clear. Thus, the layout of the flow path and the joint becomes easier. Moreover, it is easy to change the distance between the accommodating portion and the first welded portion according to the distance between the accommodating portion and the second welded portion where the non-joined portion is likely to occur.

  In the above method, it is preferable that the flow path includes a first flow path defined by the first joint and a second flow path defined by the second joint.

  According to this configuration, since there are a plurality of flow paths that are defined by different joints, the flow paths can be assigned according to the application.

In the above configuration, the first flow path is a flow path for liquid,
The second flow path is preferably a gas flow path.

  According to this configuration, the liquid flow path is defined by the joined part that does not have the non-joined part, or the first joint part that is relatively light even if it has the non-joined part. Leakage is suppressed. In addition, the gas flow path is not as problematic as the liquid flow path even if some leakage occurs due to the non-joined portion.

  Further, in the above configuration, a configuration in which the pressure generated in the first flow path is larger than the pressure in the second flow path can be adopted.

  According to this configuration, the flow paths can be allocated according to the pressure generated in the flow paths.

  In the above configuration, it is preferable that the first joint portion is formed so as to surround the second joint portion.

  According to this configuration, the first joint portion is formed so as to surround the periphery of the second joint portion, so that even if liquid leaks from the flow path defined by the second joint portion, The first joint portion prevents the leaked liquid from flowing out to the outside or another flow path. Further, the first joint portion prevents the water from evaporating from the flow path defined by the second joint portion.

  In the above configuration, it is preferable that the amount of protrusion of the second joint portion is larger than the amount of protrusion of the first joint portion.

  According to this configuration, since the amount of protrusion of the second joint is larger than the amount of protrusion of the first joint, the pressure applied at the time of joining the second joint is more than the force applied at the time of joining the first joint. This also indicates that the first member and the second member are more reliably joined at the second joint portion. For this reason, for example, even when there is a non-joined portion in the joined portion before joining, the flow path defined by the first member and the second member is more reliably sealed (liquid tight In a state in which the property or airtightness is ensured). As a result, problems such as liquid leakage and air leakage in the flow path are suppressed.

  Moreover, the said structure WHEREIN: The said 1st junction part or the said 2nd junction part prescribes | regulates the said accommodating part.

  According to this configuration, since the housing portion is defined by the first joint portion or the second joint portion, the liquid in the flow path is prevented from leaking to the housing portion side and diffusing outside the flow path member. Is done.

  In the above configuration, in the stacking direction of the first member and the second member, the thickness of the portion defining the flow path extending along the plane orthogonal to the stacking direction of the second member is It is desirable to adopt a configuration that is thinner than the thickness of the portion that defines the flow path extending along the plane of the first member.

  According to this configuration, since the portion where the non-joined portion is likely to occur in the joint portion can be concentrated on the relatively thick first member, the position where the first joint portion and the second joint portion should be provided becomes clearer. The layout of the joint and the flow path becomes easy.

  In addition, the liquid discharge head of the present invention is characterized in that the liquid is introduced from the flow path member having any one of the configurations, and the introduced liquid is discharged from the nozzle.

  According to the present invention, there is little risk of liquid leakage or air leakage in the flow path member, and reliability is improved.

  Furthermore, a liquid discharge apparatus according to the present invention includes the liquid discharge head.

  According to the present invention, there is little risk of liquid leakage or air leakage in the flow path member, and reliability is improved.

Further, the flow path member manufacturing method of the present invention is a flow path member manufacturing method having a flow path between the laminated first member and second member,
A first step of joining the first member and the second member at a first joint;
A second step of joining the first member and the second member at a second joint at a position different from the first joint;
Including
The ratio of the width of the non-joined portion in the first joint portion to the width of the first joint portion is smaller than the proportion of the width of the non-joint portion in the second joint portion to the width of the second joint portion. It is characterized by.

  According to this manufacturing method, it is possible to manufacture the flow path member using the joint portion in which the ratio of the non-joint portion is different without increasing the number of steps and complicating the process.

In the above method, the first member has a thick part and a thin part,
It is desirable that the second joint portion is closer to the thick portion than the first joint portion.

  According to this manufacturing method, it is easy to assign a flow path, and it is possible to manufacture a flow path member more easily by using a plurality of joint portions in which the proportion of the non-joint portion is different according to the distance from the thick wall portion. It becomes.

In the manufacturing method, the first member has a joint communicating with the flow path,
The second joint is preferably closer to the joint than the first joint.

  According to this manufacturing method, it is easy to assign a flow path and to manufacture a flow path member more easily by using a plurality of joint portions in which the proportion of the non-joint portion varies depending on the distance from the joint. .

  In the above manufacturing method, it is preferable that the plurality of first joint portions are respectively provided at positions sandwiching the second joint portion therebetween.

  According to this manufacturing method, it is easy to assign the flow path by the first joint portion in which the proportion occupied by the non-joined portion is relatively small and the second joint portion in which the proportion occupied by the non-joined portion is relatively large, It becomes possible to manufacture the flow path member more easily.

2 is a perspective view illustrating an internal configuration of the printer. FIG. FIG. 3 is an exploded perspective view of the recording head as viewed obliquely from above. FIG. 3 is an exploded perspective view of the recording head as viewed obliquely from below. It is a figure explaining the composition of a channel member. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG. It is CC sectional view taken on the line in FIG. It is the DD sectional view taken on the line in FIG. It is a schematic diagram explaining the junction structure of the liquid flow path in the vicinity of the liquid introduction joint. It is a schematic diagram explaining the junction structure of the liquid flow path in the vicinity of the liquid outlet joint. It is a top view explaining the width | variety of the sink mark in a junction part. It is a figure explaining the manufacturing process of a channel member. It is a figure explaining the manufacturing process of a channel member. It is a figure explaining the manufacturing process of a channel member. It is a figure explaining the modification of the manufacturing process of a flow path member. It is a figure explaining the modification of the manufacturing process of a flow path member. It is a figure explaining the modification of the manufacturing process of a flow path member. It is sectional drawing of the flow-path member in 2nd Embodiment. It is sectional drawing of the flow-path member in 3rd Embodiment. It is a top view of the 1st substrate in a 4th embodiment. It is the FF sectional view taken on the line in FIG. It is a side view of the pressure adjustment member in a 5th embodiment. It is a top view of the pressure adjustment member in 5th Embodiment. It is the other side view of the pressure adjustment member in 5th Embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings. Note that, in the embodiments described below, various limitations are made as preferred specific examples of the present invention. However, the scope of the present invention is not limited to the following description unless otherwise specified. However, the present invention is not limited to this embodiment. In the following, an ink jet printer 1 (a type of liquid ejecting apparatus, which is equipped with a flow path member 13 for supplying ink and air to an ink jet recording head (hereinafter referred to as a recording head) 3 which is a kind of liquid ejecting head. , Simply referred to as a printer).

  The configuration of the printer 1 will be described with reference to FIG. The printer 1 is an apparatus that records an image or the like by ejecting liquid ink onto the surface of a recording medium 2 such as recording paper. The printer 1 includes a recording head 3 including a plurality of head units 4, a transport mechanism 5 that transports the recording medium 2, and a medium that supports the recording medium 2 transported to a position facing each nozzle surface of the head unit 4. A support portion 6 (also referred to as a platen) is provided inside the apparatus main body 7.

  The recording head 3 in the present embodiment is a line head that is long in a direction (second direction) intersecting (orthogonal in the present embodiment) in the conveyance direction (first direction) of the recording medium 2. The recording head 3 is connected to a liquid supply tube 8 that communicates with the inside of an ink cartridge (not shown) that stores ink, which is a kind of liquid. Ink from the ink cartridge is supplied to a flow path member 13 (described later) of the recording head 3 via the liquid supply tube 8. A configuration in which the ink cartridge is mounted on the recording head can also be employed. A gas supply tube 9 that supplies gas (air in the present embodiment) to the recording head using a pump (not shown) is connected to the flow path member 13 of the recording head 3. Although not shown, the recording head 3 is also connected to a wiring member such as an FFC that supplies a drive signal from the control unit to the recording head.

  The transport mechanism 5 is disposed in a pair of upper and lower first transport rollers 10 a disposed on the upstream side in the first direction with respect to the medium support unit 6, and on the downstream side in the transport direction with respect to the medium support unit 6. A second transport roller 10b. The recording medium 2 from the supply side is conveyed toward the discharge side through the medium support unit 6 while being sandwiched between the upper and lower rollers by driving of the conveyance rollers 10a and 10b. In some cases, the transport mechanism includes an endless belt or a drum. In such a configuration, the belt or the drum functions as a medium support unit. Furthermore, as the medium support portion, a structure that adsorbs the recording medium by electrostatic force or a structure that adsorbs the recording medium by generating a negative pressure with a suction pump or the like can be adopted.

  FIG. 2 is an exploded perspective view of the recording head 3 viewed from obliquely above, and FIG. 3 is an exploded perspective view of the recording head 3 viewed from obliquely below. In the following description, the stacking direction of the constituent members of the recording head 3 will be described as an appropriate vertical direction. The recording head 3 in this embodiment includes a flow path member 13 in which a flow path for supplying ink to each head unit 4 is formed, a pressure adjustment member 14 for adjusting the pressure of ink flowing inside, and the pressure adjustment member 14. A protection plate 15 housed inside, and a head unit 4 attached to the lower surface of a base plate 16 for fixing the protection plate 15 are provided.

  Each of the flow path members 13 is formed with a liquid flow path 32 (a kind of flow path in the present invention) through which ink flows and a gas flow path 33 (a kind of flow path in the present invention) through which gas (air) flows. It is a synthetic resin plate-like member that supplies ink to the head unit 4. On the upper surface of the flow path member 13 (the upper surface of the first substrate 30 described later), a liquid introduction joint 18 (a kind of joint in the present invention) to which the liquid supply tube 8 corresponding to each color is connected protrudes in a cylindrical shape. In this state, a plurality (four in this embodiment) are formed along the first direction. In the present embodiment, as shown in FIG. 4, two adjacent liquid introduction joints 18 form a group. In the first direction, one set is disposed close to one edge of the upper surface of the first substrate 30, and the other set is disposed close to the other edge of the upper surface of the first substrate 30. For this reason, a gap is formed between the set of these liquid introduction joints 18. Each liquid introduction joint 18 is connected to a liquid outlet joint 20 (a joint according to the present invention) formed on the lower surface of the channel member 13 (the lower surface of the second substrate 31 described later) via the liquid channel 32 inside the channel member 13. ). A plurality of (two in this embodiment) gas introduction joints 19 (one type of joints in the present invention) to which the gas supply tube 9 is connected are formed on the upper surface of the flow path member 13. As shown in FIG. 4, in the first direction, the set of the gas introduction joints 19 is arranged at the center portion (position corresponding to the gap of the set of the liquid introduction joints 18) on the upper surface of the first substrate 30. Yes. The gas introduction joint 19 is communicated with a gas outlet joint 21 (a kind of joint in the present invention) formed on the lower surface of the flow path member 13 via a gas flow path inside the flow path member 13. In the present embodiment, four types of ink (for example, black (K), cyan (C), magenta (M), and yellow (Y)) are supplied to the flow path member 13 through the liquid supply tube 8 and gas is supplied. Two systems of air are supplied through the supply tube 9. The flow path member 13 distributes each of the four types of ink and the two systems of air to a total of six head units 4 in this embodiment. Details of the flow path member 13 will be described later.

  The pressure adjusting member 14 is a member made of synthetic resin, and a plurality (six in this embodiment) are arranged between the flow path substrate 31 and the base plate 16 corresponding to each head unit 4. A liquid inlet 23 corresponding to the liquid outlet joint 20 of the channel member 13 and a gas inlet 24 corresponding to the gas outlet joint 21 of the channel member 13 are formed on the upper surface of each pressure adjusting member 14. Yes. The liquid inflow port 23 communicates with a liquid outflow port 25 that protrudes below the pressure adjustment member 14 through a liquid flow path formed inside the pressure adjustment member 14. In addition, the liquid flow path inside the pressure adjusting member 14 in the present embodiment is configured to be pressurized by the air flowing in from the gas inlet 24. For this reason, the pressure of the ink in the liquid flow path can be increased by driving the pump and sending air to the pressure adjusting member 14 via the gas supply tube 9, the flow path member 13, and the gas inlet 24. Thus, the pressure of the ink in the head unit 4 can be increased. Each pressure adjusting member 14 controls the opening and closing of the four ink channels distributed by the channel member 13 to each head unit 4 and the ink supply pressure in accordance with the two air systems. By controlling the pressure of the ink in the head unit 4, the recording head 3 can also perform a cleaning operation for forcibly discharging the ink from each nozzle 26, for example.

  The six head units 4 are arranged along the second direction. Each head unit 4 has a head chip (not shown) that ejects ink from a plurality of nozzles 26. In each head unit 4, the nozzles 26 are arranged as a total of six nozzle rows along a third direction inclined at a predetermined angle with respect to the first direction and the second direction. Then, four types of ink that have passed through each pressure adjusting member 14 are supplied to six nozzle rows through the internal flow path. Each head unit 4 can selectively eject ink introduced into the internal flow path from each nozzle 26 by driving an actuator such as a piezoelectric element (not shown).

  As shown in FIG. 2, four supply ports 27 are formed for each head unit 4 on the arrangement surface of the pressure adjusting member 14 in the base plate 16. Each supply port 27 communicates with the internal flow path of the corresponding head unit 4. In a state where the pressure adjusting member 14 is mounted on the base plate 16, each supply port 27 of each head unit 4 is inserted into each liquid outlet 25 that forms an outlet flow path of the pressure adjusting member 14. Accordingly, four types of ink are supplied to the four supply ports 27 of each head unit 4 from the liquid outlet 25 of the pressure adjusting member 14.

  FIG. 4 is a top view (upper stage), a side view (middle stage), and a bottom view (lower stage) of the flow path member 13. 5 is a sectional view taken along line AA in FIG. 4, FIG. 6 is a sectional view taken along line BB in FIG. 4, and FIG. 7 is a sectional view taken along line CC in FIG. 8 is a cross-sectional view taken along the line DD in FIG. The flow path member 13 in the present embodiment has a flat plate structure in which a first substrate 30 (a kind of first member in the present invention) and a second substrate 31 (a kind of second member in the present invention) are bonded to each other. Is the body. The 1st board | substrate 30 and the 2nd board | substrate 31 are flat plate materials long in said 2nd direction, for example, are shape | molded by resin materials, such as a polypropylene. The first substrate 30 and the second substrate 31 are bonded together by bonding with an adhesive, laser welding, or ultrasonic welding in a state where they are stacked on each other. In the present embodiment, the thickness of the first substrate 30 (here, the thickness of the portion excluding the protruding portion of the liquid introduction joint 18 described later) is the thickness of the second substrate 31 (also the liquid derivation described later). It is thicker than the thickness of the portion excluding the protruding portion of the joint 20 or the like. In addition, regarding the “thickness” of these substrates 30 and 31, when specifically specified as described later, the thickness including the joint may be meant.

  On the upper surface of the first substrate 30 (the surface opposite to the bonding surface with the second substrate 31 and the upper surface of the flow path member 13), as described above, a total of four liquid introduction joints 18 and a total of 2 A number of gas introduction joints 19 are formed. In addition, a total of four liquid outlet joints 20 and a total of two liquid outlet joints 20 are provided on the lower surface of the second substrate 31 (the surface opposite to the bonding surface with the first substrate 30 and the lower surface of the flow path member 13). Gas outlet joints 21 are individually formed for each of the six head units 4.

  Four liquid channels 32 and two gas channels 33 corresponding to the inks of the respective colors are formed on the bonding surface of the first substrate 30 (the surface facing the second substrate 31). Each liquid flow path 32 and each gas flow path 33 extend along a second direction that is the longitudinal direction of the flow path member 13. In the first direction, which is the short direction of the flow path member 13, a total of four liquid flow paths 32 are formed on both sides, with two gas flow paths 33 sandwiched therebetween. That is, in the first direction of the flow path member 13, the gas flow path 33 is disposed on the center side, and the liquid flow path 32 is disposed on the outer side. As for these flow paths 32 and 33, the layout is determined based on the likelihood of sink marks in the joint 41 as will be described later. Each liquid flow path 32 is formed at a position overlapping the corresponding liquid introduction joint 18 in plan view, communicates with a liquid introduction path 35 formed in the liquid introduction joint 18, and is formed in the liquid outlet joint 19. Communicated with the liquid outlet path 37. Similarly, each gas flow path 33 is formed so as to overlap with the corresponding gas introduction joint 19 in plan view, communicates with a gas introduction path 36 formed in the gas introduction joint 19, and is connected to the gas outlet joint 21. It communicates with the gas outlet path 38 formed inside.

  In the flow path member 13, the ink flowing from the liquid introduction path 35 branches to one side and the other in the second direction and flows toward both ends of the liquid flow path 32. Then, the ink that flows toward both ends (both ends in the second direction) of the liquid flow path 32 flows out from a total of six liquid outlet paths 37 in the present embodiment. Note that the number and arrangement of the liquid introduction path 35 and the liquid outlet path 37 are not limited to those exemplified in this embodiment.

  Here, as shown in FIG. 8, both end surfaces defining both ends in the longitudinal direction (second direction) of the liquid flow path 32 are liquid flow paths from the upper surface side to the lower surface side of the first substrate 30. The inclined surface 40 is inclined in the direction in which the inner dimension in the longitudinal direction of 32 is enlarged. By using such an inclined surface 40, the ink flowing along the second direction in the liquid flow path 32 is guided by the inclined surface 40, and each of the liquid outlet passages 37 arranged in the second direction is positioned at both ends. It can flow smoothly into the liquid outlet path 37. Thereby, it is suppressed that an ink retains in the both ends of the liquid flow path 32, As a result, the discharge property of a bubble can be improved.

  9 and 10 are cross-sectional perspective views illustrating the bonding of the first substrate 30 and the second substrate 31. FIG. More specifically, FIG. 9 schematically shows the joining structure of the liquid flow path 32 in the vicinity of the liquid introduction joint 18, and FIG. 10 schematically shows the joining structure of the liquid flow path in the vicinity of the liquid outlet joint 21. ing. In addition, the joining structure of the gas flow path is substantially the same as that shown in FIGS. Further, the illustrated sink S (non-joined portion) indicates that there is a possibility that the sink S (non-joined portion) may occur in the joint portion 41, and does not necessarily indicate that it occurs in all the joint portions 41. The liquid flow path 32 and the gas flow path 33 are stacked so that the first substrate 30 and the second substrate 31 are in contact with each other, and are formed as a flow path formed in at least one of them. It is defined by joining the peripheral edge of the opening (for example, a groove or a recess). That is, in the plan view, the liquid channel 32 and the gas channel 33 are surrounded by the joint portion 41 so that the outer shape as the channel in the plan view is defined by the joint portion 41. A joint portion 41 is a portion where the first substrate 30 and the second substrate 31 are joined to each other at the opening peripheral portion of the flow passage space. Note that, at a stage before joining (before bonding or before welding), a part corresponding to the joining part 41 is a planned joining part 42 described later. In the case of bonding, the bonding portion 41 is a portion where the adhesive is applied at the bonding planned portion 42, the adhesive is cured between the first substrate 30 and the second substrate 31, and both are bonded. Further, in the case of welding, after the resin is melted by heat due to laser irradiation or heat due to application of ultrasonic vibration in the bonding portion 42, the temperature is lowered and the portion is solidified, whereby the first substrate 30 and A portion where the second substrate 31 is welded is a joint portion 41. In this case, in the joint portion 41, the resin of the first substrate 30 and the resin of the second substrate 31 may be melted and mixed together by heat. Then, the joint part 41 including the joint part 42 before joining is appropriately referred to as a joint part 41.

  Here, when molding resin parts such as the first substrate 30 and the second substrate 31 constituting the flow path member 13 in the present embodiment, a so-called sink (a book) in which a part of the surface becomes depressed. (Corresponding to a non-joined part in the invention) S may occur. In addition, in the state which board | substrates 30 and 31 were joined, the part (part like an air pocket) which is not joined in the part corresponding to the said sink S in the junction part 41 corresponds to a non-joining part. This sink S is more likely to occur as the resin part itself becomes thicker as a whole, and more likely to occur in a thicker part than other parts in the same resin part. Further, sink S is likely to occur in the central part of the resin part. When the thick portion is defined, first, it means a portion that is relatively thicker than other portions in the same member. For example, in the first substrate 30, the portion where the joints 18 and 19 are formed (the joint portion 41 on the extension of the wall forming the joints 18 and 19), or the longitudinal direction (second Or a partition wall 72 (see FIG. 21) that divides a nut accommodating portion 70 to be described later. Secondly, it means a relatively thick portion of the portion that defines the flow path in the same member (the portion that becomes the wall that divides the flow path). For example, a portion where the joints 18 and 19 are formed, the inclined surface 40 of the liquid flow path 32, and the like. 3rdly, the part which prescribes | regulates the flow path of the other member thicker than the part which prescribes | regulates the flow path of one member of the 1st member and 2nd member which comprise a flow path member. For example, the junction 41 of the first substrate 30 as the other member, which is thicker than the portion corresponding to the junction 41 of the second substrate 31 as one member. 4thly, it is a thick part of the other member rather than the thickest part of one member of the 1st member and 2nd member which comprise a flow path member. For example, as will be described later, the thick portion 54 of the first substrate 52, which is the other member, is thicker than the partition wall 53b of the second substrate 53, which is one member (see FIG. 18). On the other hand, a thin part means a part which is not a thick part in each of the first to fourth parts. For example, it is the thinnest part that defines the flow path (excluding the flow path in the joint) along the joint surface of the members constituting the flow path member. Alternatively, the second substrate 31 is a portion where the joints 20 and 21 are not formed. Alternatively, as will be described later, it is a thin portion 55 having a relatively small thickness among the portions defining the flow path 57 in the first substrate 52 (see FIG. 18).

  In the present embodiment, in particular, in the first substrate 30 that is generally thicker than the second substrate 31, the junction at the center of the region where a plurality of the liquid introduction joints 18 and the gas introduction joints 19 are formed densely. Sink S is likely to occur in the portion 41. In the portion where the sink S is generated on the joint surface (interface) between the components, the joint may be insufficient. As shown in FIGS. 9 and 10, when sink S occurs in the joint portion 41 that defines the flow path or the like, the joint may be insufficient in the portion, and the liquid may flow from the portion. There was a problem that problems such as leakage occurred.

  FIG. 11 is a schematic plan view for explaining the sink S in the joint portion 41.

  Here, the width of the joint 41 in the width direction (short direction or thickness direction in the case of a linear joint) perpendicular to the extending direction of the joint 41 defining the flow path or the like. The ratio of the width bd of sink S to Bd becomes larger as it is closer to the center part of the part or closer to the thick part. That is, among a plurality of joint portions 41 (scheduled joint portions 42) arranged side by side, the joint portion 41 (the first portion in the present invention) having a relatively long distance from the central portion or the thick portion of the parts of the flow path member 13 is used. The ratio of the width bd of sink S to the width Bd of the joint portion 41 in one kind of joint portion is a joint portion 41 (second in the present invention) whose distance from the center portion or the thick portion is relatively short. The width bd of sink S in the joint portion is smaller than the proportion of the width Bd of the joint portion 41. The joint portion 41 in the present embodiment includes a plurality of first joint portions relatively distant from a portion (center portion, thick portion, or joint) of the first substrate 30 where sink marks are likely to occur, and the plurality of the joint portions 41. 2nd junction part (joint part 41 relatively close to a sink generating part) located between these 1st junction parts is included. Regarding the width bd of sink S, as shown in FIG. 11, when there are a plurality of independent sinks S (in the case of FIG. 11, S 1 and S 2) within the width of the joint portion 41, these sinks The sum of the widths bd1 and bd2 of S is the width bd of sink S. In the joint 41 where no sink S is generated, the ratio of the width bd of the sink S to the width Bd of the joint 41 is zero.

  As described above, a plurality of joint portions 41 having different proportions of sink marks S according to the distance from the central portion, the thick portion, or the joint of the constituent members of the flow path member 13 (the first substrate 30 in the present embodiment). Among the (scheduled joining part 42), the flow path defined by the joining part 41 having a relatively long distance from the central part or the like of the constituent member is the liquid flow path 32 through which ink flows (the first flow path in the present invention). For example, a gas flow path 33 (in the present invention) through which a gas flows is defined as a flow path defined by the joint portion 41 having a relatively short distance from the central portion or the like of the component of the flow path member 13. A layout used as a kind of the second flow path in FIG. That is, the flow path in which the bonding strength (sealing degree) at the bonding portion 41 is more important in order to suppress problems due to liquid leakage has a relatively long distance from the central portion, thick portion, or joint of the component. A flow path that is defined by the joint 41 and whose joint strength (sealing degree) is not regarded as important is a joint having a relatively short distance from the center, thick part, or joint of the parts of the flow path member 13. 41 can be configured. Thus, since it has the some junction part 41 from which the ratio which the sink S occupies differs according to the distance from the center part of the structural member of the flow path member 13, a thick part, or a joint, the case where sink S arises However, the flow path can be used and laid out so that sink S is not a problem.

  In the present embodiment, as shown in FIGS. 5 to 7, the portion where sink S is most likely to occur (the proportion of sink S is larger in the joint portion 41) is the center of the first substrate 30 in the first direction. Part. Then, regarding the distance between each of the joint portions 41a to 41d arranged along the first direction of the first substrate 30 and the central portion, the first joint portion 41a having the longest distance, the second joint portion 41b, and the third joint portion. The distance is shorter in the order of the portion 41c and the fourth joint portion 41d. That is, in the present embodiment, the first substrate 30 has a relatively short distance from the central portion between the plurality of first joint portions having a relatively long distance from the central portion where sink S is most likely to occur. It has a configuration in which two junctions are arranged. For example, when the first joint 41a is viewed as the first joint in the present invention, the second joint 41b, the third joint 41c, and the fourth joint 41d located between them are It corresponds to the second joint. For example, when the 3rd junction part 41c is seen as the 1st junction part in the present invention, the 4th junction part 41d located between these is equivalent to the 2nd junction part in the present invention.

  In the present embodiment, the first liquid flow path 32a is defined by the first joint portion 41a and the second joint portion 41b located one inside (center side). Similarly, a second liquid channel 32b is defined by the second joint 41b and the third joint 41c located one more central than the second joint 41b. Further, the first gas flow path 33a and the second gas flow path 33b are defined by the third joint portion 41c and the fourth joint portion 41d closest to the center (sink generation portion). Here, in the present embodiment, the joint portion 41 (second joint portion in the present invention) located at a position relatively close to the central portion where sink S is most likely to occur is compared with the portion where sink S is more likely to occur. And located between a plurality of joints 41 (first joints in the present invention) that are relatively far away. As a result, the liquid flow path 32 is defined by the joint 41 having no sink S or the relatively light joint 41 even if it has the sink S. It is suppressed. Further, the gas flow path 33 is not as problematic as the liquid flow path 32 even if some leakage occurs due to the sink S. As described above, according to the configuration of the present embodiment, it is possible to use and layout the flow path in which sink S is unlikely to be a problem. Furthermore, since there are a plurality of channels defined by the junctions 41 that have different proportions of sink S in the junctions 41, the channels can be assigned according to the application. In the recording head 3 and the printer 1 provided with such a flow path member 13, there is little risk of liquid leakage in the liquid flow path 32 and air leakage in the gas flow path 33, so that reliability is improved.

  Note that, as in the present embodiment, the layout is not limited to the liquid flow path 32 and the gas flow path 33, and for example, a configuration in which only the liquid flow path 33 is laid out or a structure in which only the gas flow path 33 is laid out. Can be applied. Further, the use and layout of the flow path can be determined based on the pressure (time average value or maximum value) generated in each flow path. That is, the flow path defined by the joint portion 41 having a relatively long distance from the central portion or the like of the constituent members of the flow path member 13 is a flow path with a relatively large pressure (the first flow path in the present invention). Used as a kind), and the flow path defined by the joint portion 41 having a relatively short distance from the central portion or the like of the constituent members of the flow path member 13 is a flow path (in the present invention, the pressure is relatively small). A layout used as a kind of the second flow path) can be employed. Thereby, about the flow path to which a bigger pressure is provided, it becomes possible to suppress the liquid leak from the flow path and the gas leakage by the said pressure, or to suppress peeling of a junction part. Further, for a flow path having a relatively small pressure generated inside, the pressure is small, so there is little risk of liquid leakage or gas leakage from the flow path.

  Further, for example, the width Bd of the joint 41 (first joint) having a relatively long distance from the center of the constituent member is relatively narrow, and the distance from the center of the constituent member is relatively short. The width Bd of the joint portion 41 (second joint portion) can be relatively wide. Thereby, in the joint part 41 in which the ratio of sink S is larger, a larger joint area can be secured, and the joint 41 in which the ratio of sink S is smaller is configured by narrowing the width. The enlargement of the member can be suppressed. Alternatively, conversely, the width Bd of the joint 41 (first joint) having a relatively long distance from the central portion of the constituent member is relatively wide, and the distance from the central portion of the constituent member is relatively large. The width Bd of the short joint portion 41 (second joint portion) can be relatively narrow. As a result, the flow area in which the airtightness is regarded as important secures a larger joint area of the joint portion 41, so that the airtightness of the flow path is ensured more reliably, and the airtightness is more important than this. About the flow path which is not seen, the enlargement of a structural member can be suppressed by narrowing the width | variety of the junction part 41. FIG. Thus, it becomes possible to use properly according to the use and characteristic of a flow path.

  Also, what is defined by the joint portion 41 is not limited to the flow path. For example, a flow path defined by the first joint portion and a configuration other than the flow path defined by the second joint portion (for example, a nut housing portion 70 described later) may be included. Further, for example, a configuration other than the flow path defined by the first joint portion and a flow path defined by the second joint portion may be included.

  FIGS. 12 to 14 are process diagrams for explaining a method of manufacturing the flow path member 13, mainly the joining of the first substrate 30 and the second substrate 31. In the manufacturing method according to the present embodiment, a joining method that suppresses the defect due to the sink S as much as possible is employed. In these drawings, the first substrate 30 and the second substrate 31 are schematically shown for easy understanding. In each drawing, a portion that becomes the liquid flow path 32 and the gas flow path 33 is shown as an empty portion 43. Moreover, the opening peripheral part of the empty part 43 in the joint surface of the 1st board | substrate 30 is the joining plan part 42 which is a part used as the joined part 41 joined. Furthermore, in this embodiment, laser welding is exemplified as an example of the bonding method. For this reason, the 1st board | substrate 30 is produced with the thermoplastic resin which has absorptivity (light absorptivity) with respect to a laser beam. On the other hand, the 2nd board | substrate 31 is produced with the resin material which has the transmittance | permeability (light transmittance) with respect to a laser beam. In the present embodiment, sink S is generated in the planned joining portion 42 provided near the center of the first substrate 30. Hereinafter, such a portion is referred to as a sink generation portion.

  First, as shown in FIG. 12, the first substrate 30 and the second substrate 31 are stacked and placed on the support base 44 in a state where their joint surfaces are in contact with each other. The support table 44 supports a surface of the first substrate 30 opposite to the bonding surface on the second substrate 31 side. In addition, a pressure plate 45 having translucency, such as glass, is disposed on the surface of the second substrate 31 placed on the support base 44 opposite to the bonding surface with the first substrate 30. The Thereby, the stacked first substrate 30 and second substrate 31 are sandwiched between the support base 44 and the pressing plate 45. As shown by the white arrow in FIG. 12, the pressing plate 45 places the second substrate 31 in a predetermined direction toward the support base 44 in the direction in which the first substrate 30 and the second substrate 31 approach each other (stacking direction). Press with the force of. As a result, pressure is applied to each joining portion 42 as indicated by the black arrows. Assuming that each planned joining portion 42 is aligned on the same surface, the pressure applied to each scheduled joining portion 42 is substantially equal before joining (before welding).

  In the above-described state, first, the pressing plate 45 and the second substrate 31 are transmitted to the first joining planned portion 42a located farthest from the sink generation portion among the plurality of joining planned portions 42 arranged in parallel. The laser beam L is irradiated and condensed, and the part is melted by heat. About the laser beam L, it selects suitably according to the absorption spectrum, plate | board thickness (transmission length), etc. of the material of the 2nd board | substrate 31. FIG. In addition, the irradiation of the laser beam onto the planned bonding portion 42 may be performed in a batch or may be a scanning type in which a laser beam spot is moved along the planned bonding portion 42. In addition, in the case where the laser beam irradiation is performed in a plurality of times on the portion where the sink mark is generated as in the later second bonding planned portion 42b, the laser beam irradiation is not divided at the portion where the sink mark is generated. It is desirable to make it.

  The heat generated when the first bonding planned portion 42a is irradiated with laser light is also transmitted to the portion of the second substrate 31 corresponding to the first bonding planned portion 42a and melts. Then, when these portions are solidified (cured), the first substrate 30 and the second substrate 31 are welded to each other (first step). The first joining portion 41a formed by melting and curing the first joining planned portion 42a corresponds to the first joining portion in the present invention. In this first step, the resin (including the resin of the first substrate 30 and the resin of the second substrate 31; the same applies hereinafter) in the first bonding planned portion 42a is melted. The height of the surface is slightly lower than the height of the surface of the second joint planned portion 42b. For this reason, in the first step, as the height of the first bonding planned portion 42a decreases, the pressure applied to the first bonding planned portion 42a is lower than the initial pressure at the start of the first step. Accordingly, the pressure applied to the second joint planned portion 42b is increased by an amount corresponding to the pressure applied to the first joint planned portion 42a and the second joint planned portion 42b at the beginning of the first step (black in FIG. 13). See arrow). Thereby, in the 2nd joining plan part 42b, the resin part will be compressed a little by the said pressure, and it will be in the state which has a stress. In the present embodiment, the first substrate 30 and the second substrate 31 are sandwiched between the pressing plate 45 and the support base 44 and are in a substantially flat state (the main body shape of the first substrate 30 and the second substrate 31 is the same). Maintained state). That is, the original shape of the substrates 30 and 31 is maintained as a whole except for a part of the deformation such as the bonding planned portion 42. In addition, in the 1st junction part 41a, it becomes the shape which a part of molten resin protruded in the empty part 43 used as a flow path. A part of the first substrate 30 or the second substrate 31 that partially protrudes from the main body (wall surface defining the empty portion 43) toward the empty portion 43 is the first protruding portion 47a. In addition, in the structure which joins the board | substrates 30 and 31 with an adhesive agent, the excess adhesive agent which protruded from the junction part 41 to the flow path side turns into a protrusion part.

  After the first step, the laser beam L is irradiated and condensed on the second joining planned portion 42b located closer to the above sink generation portion in a state where the pressure applied to the second joining planned portion 42b is increased. After the resin of the part is melted and cured, the first substrate 30 and the second substrate 31 are welded to each other in the part (second step). The second joint portion 41b formed by melting and curing the resin in the second joint portion 42b corresponds to the second joint portion in the present invention. Since the pressure applied to the second joint planned portion 42b at the beginning of the second step is larger than the pressure applied to the first joint planned portion 42a and the second joint planned portion 42b at the beginning of the first step, the second Even when sink marks S occur in the bonding planned portion 42b, the adhesion between the first substrate 30 and the second substrate 31 in the portion is increased. Then, when the laser beam L is irradiated and condensed on the second bonding scheduled portion 42b and the resin in the portion is melted, as shown in FIG. 14, sink marks S disappear (or decrease to a level that can be ignored substantially). Then, the first substrate 30 and the second substrate 31 are welded at the second bonding portion 41b by curing. The compartments are formed in a state in which the empty portion 43 serving as the liquid flow path 32 and the gas flow path 33 is more reliably sealed (a state in which liquid tightness is ensured, a state in which air tightness is ensured). As a result, liquid leakage in the liquid channel 32 and air leakage in the gas channel 33 are suppressed. That is, by adopting the above-described flow path layout with as few defects as possible when sinks S occur, the first substrate 30 and the second substrate 31 are joined by the manufacturing method according to the present embodiment, thereby causing defects due to sinks S. Is suppressed more effectively. Further, since the first substrate 30 and the second substrate 31 are sandwiched between the pressing plate 45 and the support base 44 and joined in a substantially flat state, the first substrate 30 and the second substrate 31 are joined. The relative positional deviation with respect to 31 is suppressed. Thereby, the flow path member 13 to which the first substrate 30 and the second substrate 31 are bonded can be manufactured with higher positional accuracy. Also in the second joint portion 41b formed in this way, the second protruding portion 47b in which a part of the molten resin protrudes into the empty portion 43 serving as a flow path is formed as in the first joint portion 41a. The The protruding amount w2 of the second protruding portion 47b is larger than the protruding amount w1 of the first protruding portion 47a. That is, since the protrusion amount w2 of the second protrusion 47b is larger than the protrusion amount w1 of the first protrusion 47a, the pressure applied at the time of joining (welding) the second joint 41b is the first joint 41a. This indicates that the force is greater than the force applied at the time of bonding, and the first substrate 30 and the second substrate 31 are more reliably bonded at the second bonding portion 41b. Further, since the gas flow path 33 is assigned to the flow path having a relatively large amount of protrusion, the protrusion is compared with the liquid flow path 32 that may cause problems such as bubble adhesion due to the protrusion 47. There is no risk of malfunction due to the portion 47. Note that, in a configuration in which a joint portion joined by welding by laser light or ultrasonic vibration and a joint portion joined by an adhesive coexist, the above relationship is not necessarily satisfied with respect to the protrusion amount of the protrusion portion.

  The 1st process and the 2nd process in the above-mentioned manufacturing method show the relative order of the process, and when the number of the joining planned portions 42 which are the places to be welded is larger than the case of FIGS. The first step and the second step described above are repeated in order from the planned joining portion 42 at a position farther from the portion where the sink S is likely to occur (the central portion of the constituent member, the thick portion, or the joint). That is, with reference to each of FIGS. 5 to 7, the first joint 41 a located on the outermost side in the juxtaposed direction (first direction) of the flow paths 32, 33, the second joint 41 b, the third The welding process is performed in the order of the joint portion 41c and the fourth joint portion 41d. In this case, for example, when welding is performed on the third joint 41c, the welding process of the second joint 41b (first joint) immediately before this is the first process, and the third joint The welding process about 41c (2nd junction part) is a 2nd process. As described above, the first member and the second member can be more reliably welded at the joint portion 41 at a position close to a portion where the sink mark is likely to occur (the central portion, the thick portion, or the joint of the component member). For this reason, even if sink S is present in the joint portion 41, the flow path defined by the first member (first substrate 30) and the second member (second substrate 31) is more reliably sealed. The compartments are formed in a state where Moreover, in the positional relationship of each joint part 41 (joining planned part 42), the some joint part 41 (1st junction part) formed in welding of a 1st process is a junction part formed in welding of a 2nd process. 41 (2nd junction part) is provided in the position which pinches | interposes. Thereby, since the force which acts on a 2nd junction part with welding to the some 1st junction part in a 1st process becomes larger, it can weld more reliably in the 2nd junction part which tends to produce a sink.

  Furthermore, in the present embodiment, in the stacking direction of the first substrate 30 and the second substrate 31, a portion that defines the flow paths 32 and 33 of the second substrate 31 (a portion that faces the flow paths 32 and 33). Since the thickness is thinner than the thickness of the portion that defines the flow paths 32 and 33 of the first substrate 30, the portion where sink marks are likely to occur can be concentrated on the first substrate 30. For this reason, as compared with the case where the first substrate 30 and the second substrate 31 are provided with portions where sink marks are likely to occur, the positions where the first joint portion and the second joint portion should be provided become clearer. The layout of the flow paths 32 and 33 becomes easier. Regarding the welding method, in the present embodiment, the second substrate 31 made of a light transmissive material is made thinner overall than the first substrate 30, whereby the laser beam permeability can be improved. Further, in the present embodiment, by providing a portion where sink S is more likely to occur in the first substrate 30 than in the second substrate 31, for example, the diameter of the liquid introduction path 35 in the liquid introduction joint 18 can be reduced within the liquid outlet joint 20. It is easy to make the diameter larger than the diameter of the liquid outlet path 37, or to make the diameter of the gas inlet path 36 in the gas inlet joint 19 larger than the diameter of the gas outlet path 38 in the gas outlet joint 21. Thereby, the pressure loss in the liquid introduction path 35 and the gas introduction path 36 before branching to the liquid lead-out path 37 and the gas lead-out path 38 can be reduced.

  15 to 17 are process diagrams for explaining a modification of the method for manufacturing the flow path member 13 (joining of the first substrate 30 and the second substrate 31). This modification is different from the above manufacturing method in that the first substrate 30 and the second substrate 31 that are stacked are welded without being pressed by the pressing plate 45. That is, as shown in FIG. 15, the first substrate 30 and the second substrate 31 are stacked and placed on the support table 44 with their joint surfaces in contact with each other. In this state, first, the first substrate 30 and the second substrate 31 are welded to each other at the first joint planned portion 42a located farthest from the sink generating portion among the plurality of joint planned portions 42 arranged in parallel ( First step). At the time of laser light irradiation, pressure is applied from the surface opposite to the bonding surface of the second substrate 31 toward the first bonding planned portion 42 (black arrow in FIG. 15). In response to this, some pressure is also applied to the second bonding scheduled portion 42b, but the pressure is not positively applied.

  The first joint portion 41a formed by melting and curing the resin in the first joint planned portion 42a in the first step corresponds to the first joint portion in the present invention. In this first step, since the resin in the first joint planned portion 42a melts, the height of the surface of the portion that was the first joint planned portion 42a is slightly lower than the height of the surface of the second joint planned portion 42b. Become. As a result, the first substrate 30 is bent, and the pressing force applied to the bonding portion 42b when the laser beam is irradiated in the second step and the restoring force for returning to the original flat state of the first substrate 30; The resultant force in the substrate stacking direction is applied to the second bonding planned portion 42b. As a result, the pressure applied to the second scheduled joining portion 42b increases from the initial pressure at the start of the first step (see the black arrow in FIG. 16). Also in the present modified example, the first protruding portion 47a in which a part of the molten resin protrudes into the empty portion 43 is formed in the first joint portion 41a.

  After the first step, the first substrate 30 and the second substrate 31 are connected to each other in the second bonding planned portion 42b that is closer to the sink generation portion in a state where the pressure applied to the second bonding planned portion 42b is increased. It is welded (second step). The second joint portion 41b formed by melting and curing the resin in the second joint portion 42b corresponds to the second joint portion in the present invention. As described above, in the first step, the first substrate 30 and the second substrate 31 are welded by the first bonding planned portion 42a (first bonding portion 41a), so that at least one of the substrates 30, 31 is at least one of them. In the second step, the first substrate 30 and the second substrate 31 are welded at the second bonding planned portion 42b (second bonding portion 41b) in the second step, so that the bending of the bent substrate is reduced. The first substrate 30 and the second substrate 31 are joined so as to approach the original flat state. As a result, the pressure applied to the second bonding planned portion 42b at the beginning of the second step is equal to the restoring force of the bent substrate, so that the first bonding planned portion 42a and the second bonding planned portion at the beginning of the first step start. Since the pressure is greater than the pressure applied to 42b, even when sink marks S are generated in the second joint planned portion 42b, the laser light L is irradiated and condensed on the second joint planned portion 42b, and the resin in that portion. When melted, sink mark S disappears or decreases, and then hardens, whereby the first substrate 30 and the second substrate 31 are welded at the second joint portion 41 b, and the liquid channel 32 and the gas channel 33 become empty. The partition 43 is formed in a state where the portion 43 is more reliably sealed. As a result, liquid leakage in the liquid channel 32 and air leakage in the gas channel 33 are suppressed. Also in the second joint portion 41 b formed in this way, the second protruding portion 47 b in which a part of the molten resin protrudes into the empty portion 43 is formed in the same manner as the first joint portion 41 a. The amount of protrusion of the second protrusion 47b is larger than the amount of protrusion of the first protrusion 47a.

  In the above manufacturing method, a joining method that suppresses the defect due to the sink S as much as possible is adopted, but the above procedure is not necessarily required. In short, the first step of joining the first substrate 30 and the second substrate 31 with the joint 41 (first joint) in which the ratio of sink S is smaller, and the joint 41 (in which the ratio of sink S is larger) A manufacturing method (joining method) in which the first substrate 30 and the second substrate 31 are joined through the second step of joining the first substrate 30 and the second substrate 31 in the second joining portion) can also be adopted. . In this case, the order of the first step and the second step is not limited, and for example, the first step and the second step may be performed simultaneously. According to this manufacturing method, the flow path member 13 can be manufactured by the joint portion 41 in which the ratio of sink S is different without increasing the number of steps and complicating the process.

  FIG. 18 is a cross-sectional view illustrating the configuration of the flow path member 51 in the second embodiment. The first substrate 52 (a kind of the first member in the present invention) in the present embodiment is thicker than the second substrate 53 as a whole, and has a thick part 54 that is relatively thick and a relatively thin thickness. And a thin portion 55. On the other hand, the second substrate 53 (a kind of second member in the present invention) is the first substrate 52 side from the substrate body 53a and the bonding surface (surface opposite to the first substrate 52) side of the substrate body 53a. And partition walls 53b extending toward the front. The partition wall 53b is a wall extending along the second direction, and a plurality of partitions (in the present embodiment, a total of four partition walls 53b1 to 53b4) are provided at intervals in the first direction. In addition to the partition wall 53b along the second direction, a termination wall (not shown) extending from both edges of the bonding surface of the substrate body 53a in the second direction toward the first substrate 52 is also extended. ing. This end wall is a wall that defines an end of the flow path 57 in the second direction. The length from the surface on the bonding surface side of the substrate body 53a to the end surface of the partition wall 53b (the length from the surface on the bonding surface side of the substrate body 53a to the end surface of the end wall) is the bonding surface of the first substrate 52. The height difference between the thick portion 54 and the thin portion 55 (the surface facing the second substrate 53) is aligned. The distance between the second partition wall 53b2 and the third partition wall 53c is the distance between the first partition wall 53b1 and the second partition wall 53b2 by the amount that the thick portion 54 of the first substrate 52 is disposed therebetween. Alternatively, it is set larger than the interval between the third partition wall 53b3 and the fourth partition wall 53b4. That is, the first partition wall 53b1 and the second partition wall 53b2 are walls for partitioning the first flow path 57a, and the second partition wall 53b2 is connected to the thick portion 54 of the first substrate 52. It is also a wall for partitioning the second flow path 57b. Similarly, the third partition wall 53b3 and the fourth partition wall 53b4 are walls for partitioning the fourth flow path 57d, and the third partition wall 53b3 is connected to the thick portion 54 of the first substrate 52. It is also a wall for partitioning the third flow path 57c. The thickness of each partition wall 53b, which is the thickest portion of the second substrate 53, is smaller than the thickness of the thick portion 54 of the first substrate 52.

  A portion of the first substrate 52 that contacts the end surface of the first partition wall 53b1 and the end surface of the fourth partition wall 53b4 of the second substrate 53 is the first joint portion 56a. Similarly, portions of the first substrate 52 that are in contact with the end surface of the second partition wall 53b2 and the end surface of the third partition wall 53b3 of the second substrate 53 are the second joint portions 56b. And the end surface of the thick part 54 in the 1st board | substrate 52 which contact | abuts the joining surface of the board | substrate main-body part 53a of the 2nd board | substrate 53 is the 3rd junction part 56c. The first substrate 52 and the second substrate 53 are bonded to each other at the bonding portions 56, whereby flow paths 57 a to 57 d are defined inside the flow path member 66. In the present embodiment, regarding the distance from the thick portion 54, the first joint portion 56a is the longest, the third joint portion 56c is the shortest, and the second joint portion 56b is an intermediate distance therebetween.

  In the present embodiment, sink marks are likely to occur on the end surface (top surface) of the thick portion 54 (the ratio of sink S to the junction 56 is the largest). For this reason, the 1st junction part 56a located in the outermost side in the juxtaposition direction (1st direction) of each flow path 57, the 2nd junction part 56b located in one inner side (center part side) from this, The first flow path 57a and the fourth flow path 57d defined by the above are used as flow paths for liquid, and the second flow path 57b and the third flow path defined by the second joint portion 56b and the third joint portion 56c. The channel 57c is used as a gas channel. As a result, the first flow path 57a and the fourth flow path 57d are defined by the joint portion 56 in which sink S does not occur or the relatively slight joint portion 56 even if sink sink S has occurred. Liquid leakage in the flow paths 57a and 57d is suppressed. Further, the second flow path 57b and the third flow path 57c are not as problematic as the first flow path 57a and the fourth flow path 57d even if some leakage occurs due to the sink S. Thereby, even when sink marks S are generated, it is possible to use and layout the flow path where sink marks are unlikely to be a problem. As described above, since the plurality of joint portions 56 having different proportions of sink marks S according to the distance from the thick wall portion 54 are provided, it is possible to use and layout the flow path where the sink marks S are not problematic. In the present embodiment, the thick portion 54 and the thin portion 55 are arranged along the first direction in the first substrate 52, and the joint portions 56 a to 56 c are along the first direction in the first substrate 52. Are arranged. That is, since the arrangement direction of the thick portion 54 and the thin portion 55 and the arrangement direction of the joint portions 56a to 56c are aligned, a portion where sink S is likely to occur is clarified, and the layout of the flow path and the joint portion is clear. It becomes easier. In addition, the distance between the thick portion 54 and the first welded portion can be easily changed according to the distance between the thick portion 54 and the second welded portion where a non-joined portion is likely to occur. Other configurations are the same as those in the first embodiment.

  FIG. 19 is a cross-sectional view illustrating the configuration of the flow path member 59 of the third embodiment. The first substrate 60 (a kind of first member in the present invention) in the present embodiment is thicker than the second substrate 61 as a whole, and further, one surface (surface opposite to the bonding surface with the second substrate 61). ) And two joints 62a and 62b aligned in the first direction. The joints 62a and 62b communicate with the second flow path 63b and the third flow path 63c among the flow paths 63a to 63d defined by the first substrate 60 and the second substrate 61, respectively. The first substrate 60 and the second substrate 61 are bonded to each other at the bonding portions 64, whereby flow paths 63 a to 63 d are defined inside the flow path member 59. Thus, in this embodiment, regarding the distance from the center of the two joints 62, the first joint portion 64a is the longest, the third joint portion 64c is the shortest, and the second joint portion 64b is an intermediate between them. It is a distance.

  In the present embodiment, sink S is most likely to occur in the third joint portion 64 c in the vicinity of the joint 62 (the ratio of sink S in the joint portion 64 is the largest). For this reason, the 1st junction part 64a located in the outermost side in the juxtaposition direction (1st direction) of each flow path 63, the 2nd junction part 64b located in one inner side (center part side) from this, The first flow path 63a and the fourth flow path 63d defined by the above are used as liquid flow paths, and the second flow path 63b and the third flow path defined by the second joint portion 64b and the third joint portion 64c. The channel 63c is used as a gas channel. As a result, the first flow path 63a and the fourth flow path 63d are defined by the joint portion 64 in which sink S does not occur, or the relatively light joint portion 64 even if sink sink S has occurred. Liquid leakage in the flow paths 63a and 63d is suppressed. Further, the second flow path 63b and the third flow path 63c are not as problematic as the first flow path 63a and the fourth flow path 63d even if some leakage occurs due to the sink S. Thereby, even when sink marks S are generated, it is possible to use and layout the flow path where sink marks are unlikely to be a problem. As described above, since the plurality of joints 64 having different proportions of sink marks S according to the distance from the joint 62 are provided, it is possible to use and layout the flow path where sink marks are unlikely to be a problem. In the present embodiment, the joint 62 and the portion that does not have the joint 62 are arranged along the first direction in the first substrate 60, and the joints 64 a to 64 c are arranged in the first direction on the first substrate 60. Are arranged along. That is, since the alignment direction of the joint 62 and the portion not having the joint 62 and the alignment direction of the joint portions 64a to 64c are aligned, the portion where sink S is likely to occur is clarified. Layout becomes easier. In addition, the distance between the joint 62 and the first welded portion can be easily changed according to the distance between the joint 62 and the second welded portion where a non-joined portion is likely to occur. Other configurations are the same as those in the first embodiment.

  20 and 21 are views for explaining the configuration of the flow path member 66 in the fourth embodiment. FIG. 20 is a bottom view (joint surface) of the first substrate 67, and FIG. 21 is a FF in FIG. It is line sectional drawing. The flow path member 66 in the present embodiment includes a plurality of flow paths 69a to 69d similar to the liquid flow path 32 and the gas flow path 33 of the flow path member 13, and a nut ( A nut housing part 70 (a kind of housing part in the present invention) in which a kind of fixing member is housed is provided. The nut housing portion 70 includes a recess 70a that follows the shape of the nut on the first substrate 67 side (that is, a hexagon in plan view), an insertion hole 70b through which a bolt shaft corresponding to the nut is inserted, and a second substrate. And an opening 70 c on the 68 side, and the periphery is surrounded by the partition wall 72. In the present embodiment, the nuts are provided on the four bases 67 (a kind of the first member in the present invention) with a total of four projecting portions 73 projecting from the edge portions on both sides in the juxtaposed direction (first direction) of the flow path 69. A housing part 70 is formed. Further, the longitudinal direction of the first substrate 67 is also at the center side of the first substrate 67 in the parallel direction of the flow paths 69a to 69d and at a position different from the nut accommodating portion 70 of the protrusion 73 in the second direction. A total of four nut accommodating portions 70 are formed at intervals in the (second direction). The peripheral edge portion of the nut housing portion 70 on the joint surface of the first substrate 67, that is, the lower surface of the partition wall 72 is a joint portion 71 related to the joint with the second substrate 68.

  In the present embodiment, the ratio of sink S in the joint portion 71 (first joint portion) relatively far from the nut housing portion 70 located on the center portion side in the first direction is the center portion side in the first direction. It is smaller than the proportion of sink S in the joint 71 (second joint) that is relatively close to the positioned nut housing 70. That is, among the nut accommodating portions 70 in the first substrate 67, the nut accommodating portion 70 (the nut accommodating portion formed in the protruding portion 73) located outside in the first direction is closer to the central portion in the first direction. The sink S is likely to occur in the vicinity of the nut accommodating portion 70 located. More specifically, in FIG. 21, sink marks S are likely to occur at the fourth joint portion 71 d located at the peripheral edge portion of the nut housing portion 70 at the center portion. For this reason, also in this embodiment, the 1st junction part 71a located in the outermost side in the parallel arrangement direction (1st direction) of each flow path 69a-69d and the nut accommodating part 70, and one inner side from this (center) The first flow path 69a and the fourth flow path 69d defined by the second joint 71b located on the (part side) are used as liquid flow paths. Further, the second flow path 69b and the third flow path 69c defined by the third joint portion 71c and the fourth joint portion 71d are used as gas flow passages. As a result, the first flow path 69a and the fourth flow path 69d are defined by the joint 71 where no sink S is generated or the joint 71 where the sink S is generated even if the sink S is generated. Liquid leakage in the channels 69a and 69d is suppressed. Further, the second flow path 69b and the third flow path 69c are not as problematic as the first flow path 69a and the fourth flow path 69d even if some leakage occurs due to the sink S. Thereby, even when sink marks S are generated, it is possible to use and layout the flow path where sink marks are unlikely to be a problem. As described above, since the plurality of joints 71 having different ratios of sink marks S according to the distance from the nut housing section 70 are provided, it is possible to use and layout the flow path in which sink marks are unlikely to be a problem. Moreover, in this embodiment, the nut accommodating part 70 located in the outer side in the 1st direction is prescribed | regulated by the 1st junction part 71a and the 2nd junction part 71b. Thereby, while the peripheral part of the said nut accommodating part 70 is joined more reliably, the 1st flow path 69a adjacent to this is divided and formed in the state sealed more reliably. As a result, the necessary joint strength for the nut housing part 70 can be ensured more reliably. Further, since the joint portion 71 between the flow path 69 and the nut housing portion 70 is more reliably welded, for example, the liquid in the flow path 69 leaks to the nut housing portion 70 side and the outside of the flow path member 13 It is suppressed that it spreads to the surface. On the other hand, the nut accommodating part 70 located in the center part of the 1st direction is prescribed | regulated by the 4th junction part 71d. The central nut housing portion 70 is adjacent to the second flow path 69b and the third flow path 69c, which are gas flow paths, with the fourth joint portion 71d interposed therebetween, so that nuts are received from the flow paths 69b and 69c. Even if gas leaks to the portion 70 side, there is no particular problem.

  In the present embodiment, the nut housing portion 70 and the portion that does not have the nut housing portion 70 are disposed along the first direction in the first substrate 67, and the first joint portion and the second joint portion are: The first substrate 67 is disposed along the first direction. That is, since the alignment direction of the nut housing portion 70 and the portion not having the nut storage portion 70 and the alignment direction of the first joint portion and the second joint portion are aligned, the portion where sink marks are likely to occur is clarified. In addition, the layout of the flow path and the joint becomes easier. Moreover, it is easy to change the distance of the nut accommodating part 70 and the 1st welding part according to the distance of the nut accommodating part 70 and the 2nd welding part which a non-joining part tends to produce. Other configurations are the same as those in the first embodiment.

  22 to 24 are views for explaining the configuration of the pressure adjusting member 75 (a kind of flow path member in the present invention) in the fifth embodiment, and FIG. 22 is a side view of the pressure adjusting member 75. 23 is a top view of the pressure adjusting member 75, and FIG. 24 is another side view of the pressure adjusting member 75. The pressure adjusting member 75 is a member that adjusts the supply pressure of ink supplied from an ink supply source such as an ink cartridge to the head unit, and has two independent liquid channels. These liquid channels are channels that connect a liquid inlet 79 and a liquid outlet 80 provided in the casing 77, and each have a channel chamber 82 and a pressure adjustment chamber 83 in the middle. .

  The pressure adjusting member 75 in the present embodiment is a flow in which a flexible film 86a and a lid member 87a corresponding to the first flow path, and a flexible film 86b and a lid member 87b corresponding to the second flow path are joined to the casing 77. It is a road member. A liquid inflow port 79 for the first flow path 61 a and the second flow path 61 b is formed on the upper surface of the casing 77, and a liquid flow outlet 80 for the first flow path and the second flow path is formed on the lower surface of the casing 77. Each is formed.

  The lid member 87a of the first channel and the flexible film 86b of the second channel are joined to one side surface of the casing 77, and the flexible film 86a of the first channel and the lid member 87b of the second channel are the casing. 77 is joined to the other side surface. The flexible film 86 is a thin material having translucency and flexibility. Further, the lid member 87 is a plate material made of a thermoplastic resin having optical transparency like the second substrate 31 in the first embodiment. The flexible film 86 and the lid member 87 are disposed so as to face each other with the casing 77 interposed therebetween. In the following, since the configuration corresponding to the first flow path and the configuration corresponding to the second flow path are in a relationship to be rotated, the configuration corresponding to one flow path will be described.

  In the region covered with the lid member 87 of the casing 77, a concave portion that becomes the flow channel chamber 82, a groove portion that becomes the outlet flow channel 88, a first joint portion 89, and a second joint portion 90 are formed. Yes. The channel chamber 82 and the outlet channel 88 are portions that are recessed from the side surface of the casing 77. The channel chamber 82 communicates with the liquid inlet 79, and the end of the outlet 77 on the bottom side of the casing 77 communicates with the liquid outlet 80. On the other hand, the first joint portion 89 and the second joint portion 90 are portions that protrude from the side surface of the casing 77. The first joint portion 89 is a welding projection formed in an annular shape so as to surround the outside of the flow channel chamber 82 and the outlet flow channel 88 following the outer shape of the lid member 87. Similarly, the second joint 90 is also a welding projection, and is formed along the opening periphery of the first flow path chamber 82 and the opening periphery of the outlet flow path 88 on the inner side of the first joint 89. The lid member 87 is joined to the end surfaces of the joint portions 89 and 90, and thereby the flow path chamber 82 and the outlet flow path 88 are defined by the lid member 87 and the recess formed in the casing 77. . For joining the lid member 87 to the fixing portion 74, laser welding is adopted in which the lid portion 87 is joined by melting the fixing portion 74 by irradiation with laser light L as will be described later.

  A filter 84 that filters ink flowing through the liquid flow path and collects bubbles and foreign matters is installed inside the flow path chamber 82. The filter 84 is disposed in a portion that is depressed on the opposite side surface of the casing 77 from the end surface of the second joint portion 90 around the flow channel chamber 82. For this reason, a gap through which ink can pass is provided between the lid member 87 joined to the second joining portion 90 and the filter 84. In addition, a communication port 91 is formed at the bottom of the flow channel chamber 82 to communicate the flow channel chamber 82 with the pressure adjustment chamber 83 on the opposite side surface.

  The pressure adjustment chamber 83 formed on the side surface opposite to the flow channel chamber 82 is a space formed between the flow channel chamber 82 and the outlet flow channel 88, and is circular in a plan view recessed from the side surface of the casing 77. A concave portion having a shape is formed by sealing with a flexible film 86. In a region covered with the flexible film 86, a third fixing portion 95 formed in an annular shape is provided along the opening periphery of the concave portion serving as the pressure adjusting chamber 83. A flexible film 86 is welded to the end face of the third fixing portion 95 by laser or ultrasonic waves. A pressure adjustment mechanism 92 is installed between the pressure adjustment chamber 83 and the flow path chamber 82. This pressure adjustment mechanism 92 is coupled with the deformation of the flexible film 86 in accordance with the pressure (negative pressure) in the pressure adjustment chamber 83, and ink is supplied from the flow path chamber 82 to the pressure adjustment chamber 83 through the communication port 91. This is a valve mechanism that switches between flow and block. When the pressure adjustment mechanism 92 allows the ink to flow from the flow path chamber 82 to the pressure adjustment mechanism 92 through the communication port 91 by opening the communication port 91, the ink flowing into the pressure adjustment chamber 83 flows out from the outlet port 93. The liquid flows into the channel 88 and is supplied to the head unit side from the liquid outlet 80 communicating with the outlet channel 88. That is, in the pressure adjusting member 75, the liquid inlet 79, the channel chamber 82, the outlet channel 88, the communication port 91, the pressure adjusting chamber 83, the outlet port 93, the outlet channel 88, and the liquid outlet 80 are used. Two systems of liquid flow paths for distributing ink are formed.

  Even when the casing 77 having the above-described configuration is molded, sink marks having a partially depressed surface may occur as in the case of the first substrate 30 in the first embodiment. More specifically, in FIG. 22 or FIG. 24, sink S is likely to occur at a portion indicated by X of the second joint portion 90. In the present embodiment, the flow path is defined by the second joint portion 90 that is close to the portion where the sink S is likely to occur. However, the position is farther from the portion where the sink S is more likely to occur than the second joint 90. Since the first joint 89 is provided in the case, even if liquid leaks from the flow channel chamber 82 or the outlet flow channel 88 defined by the second joint 90, the leaked ink Is prevented from flowing out to the outside or other flow paths by the first joint portion 89. Further, the first joint 89 prevents the water of the ink from evaporating from the flow path chamber 82 or the outlet flow path 88 defined by the second joint 90.

  In the above description, the ink jet recording head 3 (recording head 3), which is a kind of liquid ejection head, has been described as an example. However, the present invention is a flow path member formed by joining a first member and a second member. Can be applied to other liquid discharge heads. For example, color material discharge heads used for the production of color filters such as liquid crystal displays, electrode material discharge heads used for electrode formation such as organic EL (Electro Luminescence) displays, FEDs (surface emitting displays), biochips (biochemical elements) The present invention can also be applied to a liquid discharge head unit including a plurality of bioorganic discharge heads and the like and a liquid discharge apparatus including the same.

  DESCRIPTION OF SYMBOLS 1 ... Printer, 2 ... Recording medium, 3 ... Recording head, 4 ... Head unit, 5 ... Conveyance mechanism, 6 ... Medium support part, 7 ... Main part of apparatus, 8 ... Liquid supply tube, 9 ... Gas supply tube, 10 ... Transfer roller, 13 ... Flow path member, 14 ... Pressure adjustment member, 15 ... Protection plate, 16 ... Base Plate, 18 ... Liquid inlet joint, 19 ... Gas inlet joint, 20 ... Liquid outlet joint, 21 ... Gas outlet joint, 22 ... Mounting hole, 23 ... Liquid inlet, 24 ... Liquid outlet, 26 ... Nozzle, 27 ... Supply port, 30 ... First substrate, 31 ... Second substrate, 32 ... Liquid flow path, 33 ... Gas flow 35, liquid introduction path, 36 ... gas introduction path, 37 ... liquid lead-out path, 38 ... gas lead-out path, 40 ... inclined surface, 41 ... fixed part, 42. ..Scheduled joint part, 43 ... empty part, 44 ... support base, 45 ... pressing plate, 47 ... extrusion part, 51 ... channel member, 52 ... first base 53 ... second substrate, 54 ... thick part, 55 ... thin part, 56 ... fixed part, 57 ... channel, 59 ... channel member, 60 ... First substrate 61 ... Second substrate 62 ... Joint joint 63 ... Flow path 64 ... Joint portion 66 ... Flow path member 67 ... First substrate 68. ..Second substrate, 69 ... flow path, 70 ... nut housing part, 71 ... fixing part, 72 ... partition wall, 73 ... projection part, 75 ... pressure adjusting member, 76 ... Liquid channel, 77 ... Casing, 79 ... Liquid inlet, 80 ... Liquid outlet, 82 ... Channel chamber, 83 ... Pressure regulating chamber, 84 ... Filter, 86 ... Flexible film, 87 ... Lid member, 88 ... Derived flow path, 89 ... First joint 90 ... Second fixing part, 91 ... Communication port, 92 ... Pressure adjustment mechanism, 93 ... Outlet, 95 ... Third fixing part

Claims (20)

A first member having a thick part and a thin part;
A second member laminated to the first member;
A flow path defined by the first member and the second member;
A joined portion in which the first member and the second member are joined;
With
The joint includes a first joint having a relatively long distance from the thick part and a second joint having a relatively short distance from the thick part,
The first joint defines the flow path;
The ratio of the width of the non-joined portion in the first joint portion to the width of the first joint portion is smaller than the proportion of the width of the non-joint portion in the second joint portion to the width of the second joint portion. A flow path member characterized by the above. The thick part and the thin part are arranged along the first direction in the first member,
2. The flow path member according to claim 1, wherein the first joint portion and the second joint portion are disposed along the first direction in the first member. A first member;
A second member laminated to the first member;
A flow path defined by the first member and the second member;
A joined portion in which the first member and the second member are joined;
With
The first member has a joint projecting from the one surface that communicates with the flow path,
The joint includes a first joint having a relatively long distance from the joint and a second joint having a relatively short distance from the joint,
The ratio of the width of the non-joined portion in the first joint portion to the width of the first joint portion is smaller than the proportion of the width of the non-joint portion in the second joint portion to the width of the second joint portion. A flow path member characterized by the above. The joint and the portion not having the joint are disposed along the first direction in the first member,
The flow path member according to claim 3, wherein the first joint portion and the second joint portion are arranged along the first direction in the first member. A first member;
A second member laminated to the first member;
A flow path defined by the first member and the second member;
A joined portion in which the first member and the second member are joined;
With
The joint includes, in the first member, a plurality of first joints and a second joint located between the plurality of first joints,
The ratio of the width of the non-joined portion in the first joint portion to the width of the first joint portion is smaller than the proportion of the width of the non-joint portion in the second joint portion to the width of the second joint portion. A flow path member characterized by the above. A first member having an accommodating portion for accommodating a fixing member for fixing the flow path member;
A second member laminated to the first member;
A flow path defined by the first member and the second member;
A joined portion in which the first member and the second member are joined;
With
The joint includes a first joint having a relatively long distance from the housing and a second joint having a relatively short distance from the housing,
The ratio of the width of the non-joined portion in the first joint portion to the width of the first joint portion is smaller than the proportion of the width of the non-joint portion in the second joint portion to the width of the second joint portion. A flow path member characterized by the above. The accommodating portion and the portion not having the accommodating portion are arranged along the first direction in the first member,
The flow path member according to claim 6, wherein the first joint portion and the second joint portion are disposed along the first direction in the first member.   The said flow path contains the 1st flow path prescribed | regulated by the said 1st junction part, and the 2nd flow path prescribed | regulated by the said 2nd junction part, The Claim 1 to Claim 7 characterized by the above-mentioned. The flow path member according to any one of the above. The first channel is a channel for liquid,
The flow path member according to claim 8, wherein the second flow path is a gas flow path.   The flow path member according to claim 8 or 9, wherein a pressure generated in the first flow path is larger than a pressure in the second flow path.   The flow path member according to any one of claims 1 to 10, wherein the first joint portion is formed so as to surround the second joint portion.   The flow path member according to any one of claims 1 to 11, wherein an amount of protrusion of the second joint portion is larger than an amount of protrusion of the first joint portion.   The flow path member according to claim 6 or 7, wherein the first joint portion or the second joint portion defines the housing portion.   In the stacking direction of the first member and the second member, the thickness of the portion that defines the flow path extending along the plane orthogonal to the stacking direction of the second member is the thickness of the first member. 14. The flow path member according to claim 1, wherein the flow path member is thinner than a thickness of a portion that defines the flow path extending along the plane.   15. A liquid discharge head, wherein a liquid is introduced from the flow path member according to claim 1, and the introduced liquid is discharged from a nozzle.   A liquid discharge apparatus comprising the liquid discharge head according to claim 15. A method of manufacturing a flow path member having a flow path between the laminated first member and second member,
A first step of joining the first member and the second member at a first joint;
A second step of joining the first member and the second member at a second joint at a position different from the first joint;
Including
The ratio of the width of the non-joined portion in the first joint portion to the width of the first joint portion is smaller than the proportion of the width of the non-joint portion in the second joint portion to the width of the second joint portion. A method for manufacturing a flow path member. The first member has a thick part and a thin part,
The flow path member manufacturing method according to claim 17, wherein the second joint portion is closer to the thick portion than the first joint portion. The first member has a joint communicating with the flow path,
The flow path member manufacturing method according to claim 17, wherein the second joint portion is closer to the joint than the first joint portion.   The manufacturing method of the flow path member according to claim 17, wherein the plurality of first joint portions are respectively provided at positions sandwiching the second joint portion therebetween.

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