Droplet dispensing head and droplet dispensing device

Abstract

A droplet discharging head according to the present disclosure comprises a flow path member, a branch flow path member, and a reservoir. The flow path member has a plurality of discharge holes from which droplets are discharged. The branch flow path member is positioned above the flow path member and has a branch flow path which is connected to the flow path member. The reservoir is positioned above the branch flow path member and supplies a liquid to the branch flow path member. The branch flow path member has a box shape.

Description

【Technical Field】 【0001】 The present disclosure relates to a droplet discharge head and a droplet discharge device. 【Background Art】 【0002】 Conventionally, as a printing head, for example, a liquid discharge head that performs various types of printing by discharging a liquid onto a recording medium is known. Patent Document 1 discloses an inkjet head having a flat laminated flow path unit having an ink flow path that guides ink supplied from an ink supply port to an ink discharge port. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2004-114404 【Summary of the Invention】 【0004】 A droplet discharge head according to an aspect of the present disclosure includes a flow path member, a branch flow path member, and a reservoir. The flow path member has a plurality of discharge holes through which droplets are discharged. The branch flow path member is located above the flow path member and has a branch flow path connected to the flow path member. The reservoir is located above the branch flow path member and supplies liquid to the branch flow path member. The branch flow path member has a box shape. 【Brief Description of the Drawings】 【0005】 [Figure 1] FIG. 1 is a schematic side view of a printer according to the first embodiment. [Figure 2] FIG. 2 is a schematic plan view of a printer according to the first embodiment. [Figure 3] FIG. 3 is an exploded perspective view showing a schematic configuration of a droplet discharge head according to the first embodiment. [Figure 4] FIG. 4 is an enlarged cross-sectional view taken along line IV-IV shown in FIG. 3. [Figure 5]Figure 5 is a perspective view illustrating the structure of the branch channel member according to the first embodiment. [Figure 6] Figure 6 is a schematic plan view of the branch channel member according to the first embodiment. [Figure 7] Figure 7 is a schematic front view of the droplet dispensing head according to the first embodiment. [Figure 8] Figure 8 is a schematic front view of the droplet dispensing head according to the first embodiment. [Figure 9] Figure 9 is an enlarged perspective view of the droplet dispensing head according to the first embodiment. [Figure 10] Figure 10 is an exploded perspective view showing the schematic configuration of the droplet dispensing head according to the second embodiment. [Figure 11] Figure 11 is a schematic perspective view showing the configuration of the wiring board, first support member, and second support member according to the second embodiment. [Figure 12] Figure 12 is a schematic perspective view showing the configuration of the pressing member according to the second embodiment. [Figure 13] Figure 13 is a cross-sectional view along the line XIII-XIII in Figure 10. [Figure 14] Figure 14 is a schematic cross-sectional view showing the configuration of one end of a droplet dispensing head according to a modified example of the second embodiment. [Modes for carrying out the invention] 【0006】 The embodiments for implementing the droplet dispensing head and droplet dispensing device according to this disclosure (hereinafter referred to as "embodiments") will be described in detail below with reference to the drawings. However, this disclosure is not limited by these embodiments. Furthermore, each embodiment can be combined as appropriate, provided that the processing content is not inconsistent. Also, the same parts are denoted by the same reference numerals in each of the following embodiments, and redundant descriptions are omitted. 【0007】 Furthermore, in the embodiments described below, expressions such as "constant," "orthogonal," "perpendicular," or "parallel" may be used, but these expressions do not require strict adherence to "constant," "orthogonal," "perpendicular," or "parallel" conditions. In other words, each of the above expressions allows for deviations such as manufacturing accuracy or installation accuracy. 【0008】 Furthermore, in the drawings referenced below, for the sake of clarity, mutually orthogonal X, Y, and Z axis directions are sometimes defined, and a Cartesian coordinate system is shown with the positive Z axis as the vertically upward direction. Also, the direction of rotation with the vertical axis as the center of rotation is sometimes referred to as the θ direction. 【0009】 Conventionally, as a printing head, liquid ejection heads are known that perform various types of printing by ejecting liquid onto a recording medium. Patent Document 1 discloses an inkjet head having a flat plate stacked channel unit having an ink channel that guides ink supplied from an ink supply port to an ink outlet. 【0010】 However, droplet ejection heads having a flow channel unit constructed by stacking multiple flat plates, as described in Patent Document 1, still have room for further improvement in terms of increasing rigidity. Furthermore, if the rigidity of the droplet ejection head is low, for example, a large amount of deflection of the nozzle surface may occur, potentially leading to ejection failures or a decrease in printing accuracy. 【0011】 Therefore, technologies that increase the rigidity of the droplet dispensing head are highly anticipated. 【0012】 (First Embodiment) <Printer Configuration> First, an overview of the printer 1, which is an example of a recording device according to the first embodiment, will be described with reference to Figures 1 and 2. Figure 1 is a schematic side view of the printer 1 according to the first embodiment, and Figure 2 is a schematic top view of the printer 1 according to the first embodiment. The printer 1 according to the first embodiment is, for example, a color inkjet printer. 【0013】 As shown in FIG. 1, the printer 1 includes a paper feed roller 2, a guide roller 3, a coater 4, a head case 5, a plurality of transport rollers 6, a plurality of frames 7, a plurality of droplet ejection heads 8, a transport roller 9, a dryer 10, a transport roller 11, a sensor unit 12, and a recovery roller 13. 【0014】 Furthermore, the printer 1 has a control unit 14 that controls the paper feed roller 2, the guide roller 3, the coater 4, the head case 5, the plurality of transport rollers 6, the plurality of frames 7, the plurality of droplet ejection heads 8, the transport roller 9, the dryer 10, the transport roller 11, the sensor unit 12, and the recovery roller 13. 【0015】 The printer 1 records an image or characters on the printing paper P by landing droplets on the printing paper P. The printing paper P is an example of a recording medium. The printing paper P is in a state of being wound around the paper feed roller 2 before use. Then, the printer 1 transports the printing paper P from the paper feed roller 2 through the guide roller 3 and the coater 4 into the inside of the head case 5. 【0016】 The coater 4 uniformly applies a coating agent to the printing paper P. As a result, the surface treatment can be performed on the printing paper P, so that the printing quality of the printer 1 can be improved. 【0017】 The head case 5 houses a plurality of transport rollers 6, a plurality of frames 7, and a plurality of droplet ejection heads 8. Inside the head case 5, a space is formed that is isolated from the outside, except for a part such as a portion where the printing paper P enters and exits that is connected to the outside. 【0018】 The internal space of the head case 5 is controlled by the control unit 14 for at least one of control factors such as temperature, humidity, and air pressure as needed. The transport roller 6 transports the printing paper P inside the head case 5 near the droplet ejection head 8. 【0019】 The frame 7 is a rectangular flat plate positioned close above the printing paper P being transported by the transport rollers 6. Furthermore, as shown in Figure 2, the frame 7 is positioned so that its longitudinal direction is perpendicular to the transport direction of the printing paper P. Inside the head case 5, multiple (for example, four) frames 7 are positioned along the transport direction of the printing paper P. 【0020】 In the following explanation, the transport direction of the printing paper P will also be referred to as the "sub-scanning direction," and the direction perpendicular to this sub-scanning direction and parallel to the printing paper P will also be referred to as the "main scanning direction." 【0021】 The droplet ejection head 8 is supplied with a liquid, such as ink, from a liquid tank (not shown). The droplet ejection head 8 ejects droplets supplied from the liquid tank. 【0022】 The control unit 14 controls the droplet ejection head 8 based on data such as images or characters, and ejects droplets toward the printing paper P. The distance between the droplet ejection head 8 and the printing paper P is, for example, about 0.5 to 20 mm. 【0023】 The droplet ejection head 8 is fixed to the frame 7. The droplet ejection head 8 is fixed to the frame 7, for example, at both ends in the longitudinal direction. The droplet ejection head 8 is positioned so that its longitudinal direction is perpendicular to the transport direction of the printing paper P. 【0024】 In other words, the printer 1 according to the first embodiment is a so-called line printer in which a droplet ejection head 8 is fixed inside the printer 1. However, the printer 1 according to the first embodiment is not limited to a line printer, but may also be a so-called serial printer. A serial printer is a printer that alternately performs the operation of recording while moving the droplet ejection head 8 in a direction intersecting the transport direction of the printing paper P, for example, in a nearly perpendicular direction, and transporting the printing paper P. 【0025】 As shown in Figure 2, multiple (for example, five) droplet ejection heads 8 are fixed to a single frame 7. Figure 2 shows an example where three droplet ejection heads 8 are located in front of the printing paper P in the transport direction and two are located behind it, and the droplet ejection heads 8 are positioned so that the centers of each droplet ejection head 8 do not overlap in the transport direction of the printing paper P. 【0026】 A head group 8A is formed by multiple droplet ejection heads 8 located on a single frame 7. The four head groups 8A are positioned along the transport direction of the printing paper P. Droplet ejection heads 8 belonging to the same head group 8A are supplied with ink of the same color. As a result, the printer 1 can print using four colors of ink with the four head groups 8A. 【0027】 The ink colors ejected from each head group 8A are, for example, magenta (M), yellow (Y), cyan (C), and black (K). The control unit 14 controls each head group 8A to eject multiple colors of ink onto the printing paper P, thereby enabling the printing of a color image on the paper P. 【0028】 Furthermore, in order to treat the surface of the printing paper P, a coating agent may be dispensed onto the printing paper P from the droplet ejection head 8. 【0029】 Furthermore, the number of droplet ejection heads 8 included in one head group 8A, or the number of head groups 8A installed in printer 1, can be appropriately changed depending on the object to be printed or the printing conditions. For example, if the color to be printed on the printing paper P is a single color and the printing is limited to the area that can be printed with one droplet ejection head 8, then the number of droplet ejection heads 8 installed in printer 1 may be as small as one. 【0030】 The printed paper P, which has been processed inside the head case 5, is transported to the outside of the head case 5 by the transport roller 9 and passes through the inside of the dryer 10. The dryer 10 dries the printed paper P. The dried printed paper P is transported by the transport roller 11 and collected by the recovery roller 13. 【0031】 In printer 1, drying the printing paper P in the dryer 10 reduces the likelihood of overlapping printing paper P sticking together or undried liquid rubbing against each other in the recovery roller 13. 【0032】 The sensor unit 12 is composed of a position sensor, a speed sensor, or a temperature sensor, etc. Based on the information from the sensor unit 12, the control unit 14 can determine the state of each part of the printer 1 and control each part of the printer 1. 【0033】 The printer 1 described so far has shown the case where printing paper P is used as the printing target (i.e., recording medium), but the printing target in printer 1 is not limited to printing paper P. For example, the printing target may be a roll of cloth or the like. 【0034】 Alternatively, the printer 1 may transport the printing paper P on a conveyor belt instead of directly transporting it. By using a conveyor belt, the printer 1 can print on sheets of paper, cut cloth, wood, tiles, etc. 【0035】 The printer 1 may also print wiring patterns for electronic devices by ejecting droplets containing conductive particles from the droplet ejection head 8. Alternatively, the printer 1 may produce chemical compounds by ejecting a predetermined amount of liquid chemical agent or droplets containing a chemical agent from the droplet ejection head 8 toward a reaction vessel or the like. 【0036】 The printer 1 may also include a cleaning unit for cleaning the droplet ejection head 8. The cleaning unit cleans the droplet ejection head 8, for example, by wiping or capping. 【0037】 Wiping is a process that removes liquid adhering to the droplet dispensing head 8 by wiping the surface of the area where the droplets are dispensed with a flexible wiper, for example. 【0038】 Furthermore, the capping process is carried out, for example, as follows: First, a cap is placed over the surface of the area from which the droplets are dispensed (this is called capping). This creates a nearly sealed space between the surface of the area from which the droplets are dispensed and the cap. 【0039】 Next, the droplets are repeatedly dispensed within this sealed space. This removes any liquid or foreign matter with a higher viscosity than standard that may have clogged the nozzle from which the droplets are dispensed. 【0040】 <Configuration of the droplet dispensing head> Next, the configuration of the droplet dispensing head 8 according to the first embodiment will be described with reference to Figures 3 and 4. Figure 3 is an exploded perspective view showing the schematic configuration of the droplet dispensing head 8 according to the first embodiment. Figure 4 is an enlarged cross-sectional view along the line IV-IV shown in Figure 3. 【0041】 The droplet dispensing head 8 comprises a head body 20, a wiring section 30, a head cover 40, and two heat sinks 45. The head body 20 includes a flow path member 21, a piezoelectric actuator substrate 22 (see Figure 4), a branched flow path member 23, and a reservoir 24. 【0042】 In the following explanation, for convenience, the direction in which the head body 20 is provided in the droplet dispensing head 8 may be referred to as "down," and the direction in which the head cover 40 is provided relative to the head body 20 may be referred to as "up." 【0043】 The flow path member 21 of the head body 20 is substantially flat in shape and has a first surface 21a (see Figure 4), which is a main surface, and a second surface 21b (see Figure 4), which is located on the opposite side of the first surface. The first surface 21a has an opening (not shown), and liquid is supplied from the reservoir 24 to the inside of the flow path member 21 through this opening. 【0044】 The second surface 21b has multiple discharge holes (not shown) for discharging droplets onto the printing paper P. The flow channel member 21 has a flow channel inside that allows liquid to flow from the first surface 21a to the second surface 21b. 【0045】 The piezoelectric actuator substrate 22 is located on the first surface 21a of the flow channel member 21. The piezoelectric actuator substrate 22 has a plurality of displacement elements (not shown). The flexible substrate 31 of the wiring section 30 is electrically connected to the piezoelectric actuator substrate 22. 【0046】 The branch channel member 23 is located on the channel member 21. The branch channel member 23 has a branch channel 231 (see Figure 6) inside that connects to the channel of the channel member 21. The branch channel member 23 is made of a highly rigid material such as stainless steel. Details of the branch channel member 23 will be described later with reference to Figure 4. 【0047】 The reservoir 24 is located on the branched flow channel member 23. The reservoir 24 has openings 24a at both ends in the main scanning direction (Y-axis direction). In other words, the reservoir 24 has two openings 24a. The reservoir 24 has a flow channel inside, and liquid is supplied from the outside through the openings 24a. The reservoir 24 supplies liquid to the flow channel member 21. The reservoir 24 also stores the liquid supplied to the flow channel member 21. 【0048】 When printing, liquid may be supplied from one opening 24a while the other opening 24a is closed. Alternatively, liquid may be supplied from both openings 24a. When initially introducing liquid to the droplet ejection head 8, supplying liquid from one opening 24a and collecting it from the other opening 24a allows air and storage liquid in the flow path inside the reservoir 24 to easily escape from the flow path, thus facilitating the introduction of liquid to the droplet ejection head 8. 【0049】 Furthermore, while printing is in progress, liquid may be supplied from one opening 24a and collected from the other opening 24a. Doing so makes it less likely for air bubbles to accumulate in the flow path inside the reservoir 24. In addition, by supplying liquid adjusted to a constant temperature, the temperature of the droplet ejection head 8 can be stabilized. The collected liquid may be passed through a filter or the like and then supplied back to the droplet ejection head 8. In other words, the liquid may be circulated. The supply and collection of liquid to and from the droplet ejection head 8, or the circulation of the liquid, may be controlled by the control unit 14. 【0050】 Furthermore, liquid may be supplied from the reservoir 24 to the flow channel member 21, and liquid may be collected from the flow channel member 21 to the reservoir 24. In addition, within the flow channel member 21, liquid may be supplied and collected in the flow channel facing the nozzle (discharge hole) to prevent liquid from accumulating inside and around the nozzle. In such an embodiment, liquid is supplied to the droplet discharge head 8 from the outside, a portion of the liquid is discharged from the discharge hole, and the undischarged liquid is collected to the outside. 【0051】 As shown in Figure 4, the reservoir 24 may further include a heater substrate 24c and a heat-generating resistor 24d. The heater substrate 24c brings the liquid flowing through the head body 20 closer to a predetermined temperature. In addition, a hole 24b for accommodating a fixing member 50 (see Figure 8) is formed on the side of the reservoir 24 facing the heat sink 45. 【0052】 The wiring section 30 includes a flexible circuit board 31, a wiring circuit board 32, a plurality of driver ICs 33, and a pressing member 34. The flexible circuit board 31 is a flexible wiring circuit board that transmits a predetermined signal sent from the outside to the head body 20. As shown in Figure 3, the droplet ejection head 8 according to the first embodiment has two flexible circuit boards 31. 【0053】 One end of the flexible circuit board 31 is electrically connected to the piezoelectric actuator circuit board 22 of the head body 20 (see Figure 4). The other end of the flexible circuit board 31 is extended above the reservoir 24 and is electrically connected to the wiring circuit board 32. This allows the piezoelectric actuator circuit board 22 of the head body 20 to be electrically connected to the outside. 【0054】 The wiring board 32 is located above the head body 20. The wiring board 32 distributes signals to multiple driver ICs 33. 【0055】 Multiple driver ICs 33 are located on one main surface of the flexible substrate 31. As shown in Figure 3, in the droplet ejection head 8 according to the first embodiment, two driver ICs 33 are provided on each flexible substrate 31. However, the number of driver ICs 33 provided on a single flexible substrate 31 is not limited to two. 【0056】 The driver IC 33 drives each displacement element on the piezoelectric actuator substrate 22 of the head body 20 based on the drive signal sent from the control unit 14 (see Figure 1). This allows the driver IC 33 to drive the droplet dispensing head 8. 【0057】 The pressing member 34 is, for example, a leaf spring having a roughly U-shape in cross-section. The pressing member 34 is located between the two flexible substrates 31 and presses the driver IC 33 on the flexible substrates 31 toward the heat sink 45. As a result, the driver IC is in close contact with the heat sink 45, allowing the heat generated when the driver IC 33 is driven to be efficiently dissipated to the heat sink 45. 【0058】 The head cover 40 is attached to the head body 20 and is positioned to cover the wiring section 30 located on the head body 20, such as the flexible circuit board 31, the wiring circuit board 32, the pressing member 34, etc. This allows the head cover 40 to seal the wiring section 30. The head cover 40 is made of, for example, resin or metal. 【0059】 The head cover 40 is box-shaped and extends long in the main scanning direction, and has a first opening 40a and a second opening 40b on two opposing sides along the sub-scanning direction. In the example in Figure 3, the first opening 40a is provided on the side located on the positive X-axis side, and the second opening 40b is provided on the side located on the negative X-axis side. The head cover 40 also has a third opening 40c on its lower surface and a fourth opening 40d on its upper surface. 【0060】 The two heat sinks 45 are attached to the head cover 40. One of the two heat sinks 45 is positioned to cover the first opening 40a, and the other is positioned to cover the second opening 40b. 【0061】 The heat sink 45 is, for example, a plate-shaped member that is long in the longitudinal direction of the droplet ejection head 8, and is made of a metal or alloy with high heat dissipation properties. The heat sink 45 is provided so as to be in contact with the driver IC 33 and dissipates the heat generated by the driver IC 33. 【0062】 Each of the two heat sinks 45 has multiple through holes 46 for accommodating a fixing member 50 (see Figure 8). The head cover 40 has multiple through holes 41 for accommodating such fixing member 50. The two heat sinks 45 are each fixed to the head cover 40 by the fixing member 50 (see Figure 8). The head cover 40 to which the heat sinks 45 are attached has a box shape with the first opening 40a and the second opening 40b closed and the third opening 40c and the fourth opening 40d open. 【0063】 The third opening 40c is positioned opposite the reservoir 24. The flexible substrate 31 and the pressing member 34 are inserted through the third opening 40c. 【0064】 The fourth opening 40d is provided for inserting a connector (not shown) provided on the wiring board 32. Sealing the space between the connector and the fourth opening 40d with resin or the like makes it difficult for liquids or debris to enter the inside of the head cover 40. 【0065】 Furthermore, the head cover 40 may have an insulating section (not shown) between the heat sink 45 and the head body 20. By providing an insulating section in the head cover 40, heat generated by the driver IC 33 is less likely to be transferred to the head body 20 via the heat sink 45. 【0066】 Figure 3 shows an example of the configuration of the droplet dispensing head 8, and may include other components besides those shown in Figure 3. 【0067】 Next, the details of the branch channel member 23 according to the first embodiment will be described with reference to Figures 5 and 6. Figure 5 is a perspective view illustrating the structure of the branch channel member 23 according to the first embodiment. Figure 6 is a schematic plan view of the branch channel member 23 according to the first embodiment. 【0068】 As shown in Figure 5, the branch channel member 23 is a box-shaped member that extends long in the main scanning direction (Y-axis direction) and has an open top surface. The branch channel member 23 has a bottom portion 233, a peripheral wall portion 234 rising from the bottom portion 233, and two slit portions 235. The bottom portion 233 is located above the channel member 21. The bottom portion 233 has an opposing surface 233a facing the channel member 21 and a box bottom surface 233b located opposite the opposing surface 233a (see Figure 4). The box bottom surface 233b is surrounded by the peripheral wall portion 234. 【0069】 Because the branch channel member 23 is box-shaped, its rigidity can be increased compared to when the branch channel member 23 is flat. As a result, the amount of deflection of the nozzle surface of the channel member 21 joined to the branch channel member 23 can be reduced. 【0070】 In the branch channel member 23 according to the first embodiment, the height H1 (see Figure 4) of the peripheral wall portion 234 relative to the box bottom surface 233b is greater than 20% of the width W1 (see Figure 4) in the short direction of the bottom portion 233. This makes it possible to further increase the rigidity of the branch channel member 23. 【0071】 The peripheral wall portion 234 of the branch channel member 23 further has an overhang portion 234a that extends outward from the branch channel member 23. This prevents droplets discharged from the discharge hole of the channel member 21 from scattering onto the heat sink 45 or the fixing materials 70a to 70d described later. 【0072】 A portion of the reservoir 24 is located in the region enclosed by the bottom 233 and the peripheral wall 234 of the branch channel member 23. In other words, a portion of the reservoir 24 is housed inside the box-shaped branch channel member 23. This allows the droplet discharge head 8 to be made smaller in the height direction (Z-axis direction) compared to the case where the reservoir 24 is provided on a flat-plate-shaped branch channel member 23. 【0073】 The slit portion 235 is a groove-shaped void extending along the longitudinal direction (Y-axis direction) of the branch channel member 23. The two slit portions 235 are arranged so as to sandwich the bottom portion 233 in a plan view. A flexible substrate 31 connected to the piezoelectric actuator substrate 22 is inserted through the slit portions 235. 【0074】 In the first embodiment, an elastic member 60 is positioned between the branch channel member 23 and the reservoir 24. The elastic member 60 is a plate-shaped member that extends long in the longitudinal direction (Y-axis direction) of the droplet discharge head 8 in a plan view, and is positioned on the bottom 233 of the branch channel member 23 (see Figure 4). For example, silicone rubber may be used for the elastic member 60. The elastic member 60 may have a higher thermal conductivity than the branch channel member 23. This allows heat from the heater substrate 24c of the reservoir 24 to be efficiently transferred to the branch channel member 23, making the temperature distribution on the nozzle surface more uniform. 【0075】 In the first embodiment, a plurality of O-rings 80 are positioned between the branched flow channel member 23 and the reservoir 24 to seal the connection between the branched flow channel member 23 and the reservoir 24. This further improves the sealing performance of the droplet discharge head 8. 【0076】 Furthermore, in the droplet discharge head 8 according to the first embodiment, even when stress occurs due to the provision of the elastic member 60 and the O-ring 80, the rigidity of the branched flow channel member 23 is high, so the amount of deflection of the nozzle surface of the flow channel member 21 joined to the branched flow channel member 23 can be reduced. 【0077】 In the first embodiment, the branch channel member 23 and the reservoir 24 are fixed at both ends in the longitudinal direction of the droplet discharge head 8. For example, as shown in Figure 6, the branch channel member 23 and the reservoir 24 are fixed by fixing materials 90a and 90b (an example of the first fixing material). The fixing materials 90a and 90b are, for example, waterproof double-sided tape. However, the fixing materials 90a and 90b may be gel or sealing resin, etc. This improves the sealing performance of the branch channel member 23 and the reservoir 24, and prevents liquid leakage. 【0078】 Next, the details of the fixing points between the heat sink 45 and the branch channel member 23 and reservoir 24 will be explained with reference to Figures 7 to 9. Figures 7 and 8 are schematic front views of the droplet dispensing head 8 according to the first embodiment. Figure 9 is an enlarged perspective view of the droplet dispensing head 8 according to the first embodiment. For ease of understanding, the heat sink 45 and fixing member 50 are omitted from Figure 7. Also, the recess 47 of the heat sink 45 and the fixing member 50 are omitted from Figure 9. 【0079】 As shown in Figures 7 and 8, in the first embodiment, the heat sink 45, the branch channel member 23, and the reservoir 24 are fixed together by a fixing material 70d (an example of a second fixing material). For example, double-sided tape, gel, or sealing resin may be used as the fixing material 70d. If the fixing material 70d is waterproof double-sided tape, one adhesive surface of the fixing material 70d is positioned to straddle the branch channel member 23 and the reservoir 24, and the other adhesive surface is positioned on the heat sink 45. This further improves the sealing performance of the droplet discharge head 8 and makes it less likely for liquid to leak. 【0080】 Furthermore, in the first embodiment, the head cover 40 and the heat sink 45 may be fixed together by fixing materials 70a to 70c (an example of a third fixing material). Similar to fixing material 70c, waterproof double-sided tape, gel, or sealing resin may be used for fixing materials 70a to 70c. If fixing materials 70a to 70c are waterproof double-sided tape, one adhesive surface of fixing material 70a to 70c is located on the flange portion (the part where the through hole 41 is provided) located on the periphery of the first opening 40a and second opening 40b (Figure 3) of the head cover 40, and the other adhesive surface is located on the heat sink 45. This further enhances the sealing performance of the droplet ejection head 8. 【0081】 Furthermore, in the first embodiment, the reservoir 24 and head cover 40 and the heat sink 45 are partially sealed with a sealant. Specifically, as shown in Figure 9, the droplet dispensing head 8 has a region P1 in which neither the fixing material 70c nor the fixing material 70d is present in part of the gap between the reservoir 24 and head cover 40 and the heat sink 45. The sealant is located in this region P1. That is, the sealant is positioned across the reservoir 24 and the heat sink 45 so as to seal the gap between the reservoir 24 and the heat sink 45 where neither the fixing material 70c nor the fixing material 70d is present. For example, resin may be used as the sealant. This makes it possible to fix the reservoir 24 and the heat sink 45 even between adjacent fixing materials, and further improves the sealing performance of the droplet dispensing head 8. 【0082】 As shown in Figure 8, the portion of the heat sink 45 facing the branch channel member 23 and the reservoir 24 protrudes in the longitudinal direction (Y-axis direction) of the head body 20 more than the portion facing the head cover 40. The upper surface 45a of the portion facing the branch channel member 23 and the reservoir 24 is located below the region P1 described above. This allows the upper surface 45a to receive any uncured sealant applied to region P1 during the manufacturing of the droplet discharge head 8, for example, so that the sealant can be more reliably sealed in region P1. 【0083】 Furthermore, the branch channel member 23 and reservoir 24 and the heat sink 45 are partially sealed with caulking material. Specifically, as shown in Figure 9, the droplet discharge head 8 has a region P2 in which the fixing material 90a and fixing material 70d come into contact in part of the gap between the branch channel member 23 and reservoir 24 and the heat sink 45. The caulking material is located in this region P2. In region P2, the side surface (the non-adhesive surface) of the fixing material 90a comes into contact with the fixing material 70d, which may result in insufficient sealing. Therefore, by sealing the space between the fixing material 90a and fixing material 70d with caulking material, the sealing performance of the droplet discharge head 8 can be further improved. This allows the branch channel member 23 and reservoir 24 and the heat sink 45 to be fixed even in places where the fixing materials come into contact perpendicularly, thereby further improving the sealing performance of the droplet discharge head 8. 【0084】 As shown in Figure 8, the upper surface 23a of the overhang portion 234a of the branch channel member 23 is located below the region P2 described above. This allows the upper surface 23a to receive any uncured caulking material applied to region P2 during the manufacturing of the droplet discharge head 8, for example, so that the sealing of region P2 with the caulking material can be made more reliable. 【0085】 In the first embodiment, the reservoir 24 and the heat sink 45 are fixed together by a fixing member 50. Specifically, the reservoir 24 and the heat sink 45 are fixed together by the fixing member 50 at both ends in the longitudinal direction of the droplet dispensing head 8. The fixing member 50 has a shaft portion having a spiral groove on its outer circumference and a head portion located at the end of the shaft portion. For example, screws, bolts, or bolts may be used as the fixing member 50. This makes it possible to fix the area around the parts that are fixed with fixing materials 70a to 70d or caulking material, and further improves the sealing performance of the droplet dispensing head 8. 【0086】 Furthermore, in the first embodiment, the heat sink 45 has a plurality of recesses 47 that accommodate the head of the fixing member 50. This makes it possible to reduce the amount of protrusion of the fixing member 50 compared to the case where there are no recesses 47, and to miniaturize the droplet discharge head 8 in the shorter direction. 【0087】 (Second Embodiment) Next, the droplet dispensing head 8a according to the second embodiment will be described with reference to Figures 10 to 13. Figure 10 is an exploded perspective view showing the schematic configuration of the droplet dispensing head 8a according to the second embodiment. Figure 11 is a schematic perspective view showing the configuration of the wiring board 32, the first support member 161, and the second support member 162 according to the second embodiment. Figure 12 is a schematic perspective view showing the configuration of the pressing member 163 according to the second embodiment. Figure 13 is a cross-sectional view along the line XIII-XIII in Figure 10. In other words, Figure 13 is a cross-sectional view of one end of the head body 20 in the longitudinal direction. For ease of understanding, the support member 160 is omitted from Figure 10. Furthermore, in the following second embodiment, the same symbols are used for the same parts as in the first embodiment to omit redundant explanations. 【0088】 The droplet ejection head 8a shown in Figure 10 differs from the droplet ejection head 8 according to the first embodiment shown in Figure 3, mainly in the configuration of the wiring section 30. 【0089】 The droplet ejection head 8a according to the second embodiment is similar to the droplet ejection head 8 according to the first embodiment shown in Figure 3, and includes a head body 20a, a wiring section 30a, a head cover 40, and two heat sinks 45. 【0090】 The head body 20a includes a flow channel member 21, a piezoelectric actuator substrate (not shown), a branch flow channel member 51, and a reservoir 52. 【0091】 The wiring section 30a includes a flexible substrate 31, a wiring substrate 32, a plurality of support members 160, a plurality of driver ICs 33, and a pressing member 163. 【0092】 As shown in Figure 11, the multiple support members 160 support the wiring board 32. Specifically, the multiple support members 160 include a first support member 161 and a second support member 162. 【0093】 The first support member 161 is located at one end of the wiring board 32 in the longitudinal direction of the head body 20a. Specifically, the first support member 161 has a base portion 161b, a support portion 161a extending vertically from one end of the base portion 161b in the longitudinal direction, and a fixing portion 161c extending vertically from the other end of the base portion 161b in the longitudinal direction. The wiring board 32 is positioned so that its bottom surface is on top of the base portion 161b and one of its main surfaces is in contact with the support portion 161a. 【0094】 A through hole 161d is formed in the support portion 161a. The wiring board 32 has a through hole 32b that penetrates both main surfaces at a position corresponding to the through hole 161d. The wiring board 32 and the first support member 161 are fixed together by inserting and screwing in fixing members (not shown) such as bolts or screws through the through holes 161d and 32b. A through hole 161e is formed in the base portion 161b. Details of the fixing portion 161c will be described later. 【0095】 The second support member 162 is located at the other end of the wiring board 32 in the longitudinal direction of the head body 20a. Specifically, the second support member 162 has a base portion 162b, a support portion 162a extending vertically from one end of the base portion 162b in the longitudinal direction, and a fixing portion 162c extending vertically from the other end of the base portion 162b in the longitudinal direction. The wiring board 32 is positioned so that its bottom surface is on top of the base portion 162b and one of its main surfaces is in contact with the support portion 162a. 【0096】 A through hole 162d is formed in the support portion 162a. The wiring board 32 has a through hole 32b that penetrates both main surfaces at a position corresponding to the through hole 161d. The wiring board 32 and the second support member 162 are fixed together by inserting and screwing in fixing members (not shown) such as bolts or screws through the through holes 161d and 32b. A through hole 162e is formed in the base portion 162b. Details of the fixing portion 162c will be described later. 【0097】 As shown in Figure 12, the pressing member 163 comprises two side wall portions 163a and 163b, a bottom portion 163c, and two fixing portions 163d. 【0098】 The bottom portion 163c connects the lower ends of the two side wall portions 163a and 163b. The bottom portion 163c has multiple through holes 165 at both ends in the longitudinal direction of the head body 20. The reservoir 52 has through holes (not shown) at positions corresponding to the through holes 165. The branch channel member 51 has screw holes (not shown) at positions corresponding to the through holes 165. Fixing members (not shown), such as bolts or screws, are inserted through the through holes 165 in the bottom portion 163c of the pressing member 163 and the through holes in the reservoir 52. The fixing members (not shown) are screwed into the screw holes of the branch channel member 51. In this way, the pressing member 163 is fixed to the branch channel member 51, which is made of a high-rigidity material, via the reservoir 52. 【0099】 Furthermore, a through hole 166a is formed in the bottom portion 163c at a position corresponding to the through hole 161e (see Figure 11) in the base portion 161b of the first support member 161. A fixing member (not shown), such as a bolt or screw, is inserted through the through hole 166a and the through hole 161e. The fixing member (not shown) is screwed into, for example, a threaded groove formed in the through hole 161e. In this way, the first support member 161 is fixed to the pressing member 163. Similarly, a through hole 166b is formed in the bottom portion 163c at a position corresponding to the through hole 162e in the base portion 162b of the second support member 162. A fixing member (not shown), such as a bolt or screw, is inserted through the through hole 166b and the through hole 162e. The fixing member (not shown) is screwed into, for example, a threaded groove formed in the through hole 162e. In this way, the second support member 162 is fixed to the pressing member 163. In this way, the first support member 161 is fixed to the pressing member 163, and thereby fixed to the branch channel member 51 made of a high-rigidity material via the pressing member 163 and the reservoir 52. 【0100】 The two fixing portions 163d are provided at both ends of one of the two side wall portions 163a and 163b (in this case, side wall portion 163b). In other words, the two fixing portions 163d are provided at both ends of the pressing member 163 in the longitudinal direction of the head body 20. Details of the fixing portions 163d will be described later. 【0101】 As described above, the pressing member 163 and the plurality of support members 160 according to the second embodiment are fixed to the branch channel member 51 made of a high-rigidity material. The heat sink 45 according to the second embodiment is fixed to these pressing member 163 and the plurality of support members 160 at both ends in the longitudinal direction of the head body 20. With this configuration, the droplet discharge head 8a is less likely to tip over even when an external force is applied to the heat sink 45. 【0102】 The details of the fixing points between the head cover 40, the pressing member 163, and the multiple support members 160 will be described below with reference to Figure 13. Figure 13 shows the configuration of the fixing point at one end in the longitudinal direction of the droplet discharge head 8a, and the configuration of the fixing point at the other end is omitted, but the fixing point at the other end has the same configuration as the fixing point at one end. 【0103】 First, the fixing point on one end of the droplet ejection head 8a in the width direction, specifically on the negative X-axis side, will be described. A through hole 163e is formed in the fixing portion 163d of the pressing member 163. The head cover 40 has a through hole 41 located at a position corresponding to the through hole 163e. One of the two heat sinks 45 has a through hole 46 located at a position corresponding to the through hole 163e. The fixing member 180 is inserted through these through holes 163e, 41, and 46 and screwed in, thereby fixing the pressing member 163, the head cover 40, and the heat sink 45 at one end in the longitudinal direction of the head body 20. 【0104】 Next, the fixing point on the other end of the droplet ejection head 8a in the width direction, specifically on the positive X-axis side, will be described. A through hole 161f is formed in the fixing portion 161c of the first support member 161. The head cover 40 has a through hole 41 located at a position corresponding to the through hole 161f. The other of the two heat sinks 45 has a through hole 46 located at a position corresponding to the through hole 161f. The fixing member 181 is inserted through these through holes 161f, 41, and 46 and screwed in, thereby fixing the first support member 161, the head cover 40, and the heat sinks 45 at one end in the longitudinal direction of the head body 20. 【0105】 Similarly, at the other end of the head body 20 in the longitudinal direction, the pressing member 163 or the second support member 162, the head cover 40, and the heat sink 45 are fixed by fixing members. In this way, the heat sink 45 and the head cover 40 according to the second embodiment are fixed at both ends of the head body 20 in the longitudinal direction to members (here, the pressing member 163, the first support member 161, and the second support member 162) that are directly or indirectly fixed to the branch flow channel member 51. This makes it difficult for the head cover 40 to tip over even if an external force is applied to the droplet discharge head 8a. If the head cover 40 were to tip over, the resin seal between the head cover 40 and the reservoir 52 might peel off. In contrast, with the droplet discharge head 8a according to the second embodiment, the head cover 40 is less likely to tip over, making it difficult for the seal to break. 【0106】 In the droplet discharge head 8a according to the second embodiment, the branched channel member 51 may be box-shaped, similar to the droplet discharge head 8 according to the first embodiment. This increases the rigidity of the branched channel member 51 compared to the case where the branched channel member 51 is flat. As a result, the amount of deflection of the nozzle surface of the channel member 21 joined to the branched channel member 51 can be reduced. 【0107】 The droplet dispensing head 8a according to the second embodiment may further have two plate members 170 that join the heat sink 45 and the head body 20. 【0108】 The plate member 170 is made of resin and joins the heat sink 45 to the branch channel member 51 of the head body 20. The plate member 170 is a member that extends long in the main scanning direction (Y-axis direction). The width of the plate member 170 in the longitudinal direction is about the same as the width of the heat sink 45 in the longitudinal direction. The thermal conductivity of the plate member 170 may be lower than that of the heat sink 45. By providing the plate member 170, heat generated by the driver IC 33 is less likely to be transferred to the head body 20 via the heat sink 45. 【0109】 The plate member 170, the heat sink 45, and the branch channel member 51 of the head body 20 may be bonded together with double-sided tape or adhesive. 【0110】 As described above, the droplet ejection head 8a according to the second embodiment is fixed to the branch channel member 51, a member directly or indirectly fixed to it, a heat sink 45, and both ends of the head body 20 in the longitudinal direction. This increases the rigidity of the droplet ejection head 8a. 【0111】 In this example, the members fixed to both ends of the heat sink 45 and the head body 20 in the longitudinal direction are the pressing member 163 and the support member 160. However, such members only need to be members that are directly or indirectly fixed to the branch channel member 51, and do not necessarily need to be the pressing member 163 and the support member 160. For example, the members fixed to both ends of the heat sink 45 and the head body 20 in the longitudinal direction may consist only of the pressing member 163. In this case, fixing portions 163d may be provided on both of the two side wall portions 163a and 163b (see Figure 12) of the pressing member 163. Also, the members fixed to both ends of the heat sink 45 and the head body 20 in the longitudinal direction may consist only of the support member 160, or they may be other members. 【0112】 <Modified form of the second embodiment> A modified example of the droplet dispensing head 8a according to the second embodiment will be described with reference to Figure 14. Figure 14 is a schematic cross-sectional view showing the configuration of one end of the droplet dispensing head 8a according to a modified example of the second embodiment. In the following modifications, the same symbols are used for parts that are the same as in the second embodiment, and redundant explanations will be omitted. 【0113】 The fixing member for fixing the heat sink 45 to the pressing member 163 and the fixing member for fixing the heat sink 45 to the support member 160 may be fastened to the same member. 【0114】 Specifically, as shown in Figure 14, the first support member 161 may have a cylindrical portion 167 with screw grooves formed on its inner circumferential surface. The cylindrical portion 167 is, for example, cylindrical. For example, the cylindrical portion 167 may be inserted through a notch 161g provided in the support portion 161a of the first support member 161. Alternatively, the cylindrical portion 167 may be formed integrally with the first support member 161. The first male screw 190 is inserted through the through hole 46 of one of the two heat sinks 45, the through hole 41 of the head cover 40, and the through hole 163e of the fixing portion 163d of the pressing member 163. The first male screw 190 is screwed into the cylindrical portion 167. As a result, one of the two heat sinks 45, the head cover 40, and the pressing member 163 are fixed at one end in the longitudinal direction of the head body 20. 【0115】 Similarly, the second male screw 191 is inserted through the through hole 46 of the other of the two heat sinks 45, the through hole 41 of the head cover 40, and the through hole 161e of the fixing portion 161c of the first support member 161. The second male screw 191 is screwed into the cylindrical portion 167, thereby fixing the other of the two heat sinks 45, the head cover 40, and the first support member 161 at one end in the longitudinal direction of the head body 20. 【0116】 Similarly, at the other end of the head body 20 in the longitudinal direction, the second support member 162 may have a cylindrical portion (not shown) with screw grooves formed on its inner circumferential surface, and a first male screw (not shown) for fixing one of the two heat sinks 45 and the pressing member 163, and a second male screw (not shown) for fixing the other of the two heat sinks 45 and the second support member 162 may be fastened to the same cylindrical portion. 【0117】 Thus, in the droplet ejection head 8a according to the second embodiment, the rigidity of the droplet ejection head 8a can be further increased by fastening the first male screw 190 and the second male screw 191 to the same cylindrical portion 167. 【0118】 In one embodiment, (1) a droplet dispensing head (for example, droplet dispensing head 8) includes a flow channel member (for example, flow channel member 21), a branched flow channel member (for example, branched flow channel member 23), and a reservoir (for example, reservoir 24). The flow channel member has a plurality of dispensing holes from which droplets are dispensed. The branched flow channel member is located above the flow channel member and has a branched flow channel (for example, branched flow channel 231) connected to the flow channel member. The reservoir is located above the branched flow channel member and supplies liquid to the branched flow channel member. The branched flow channel member is box-shaped. 【0119】 (2) In the droplet discharge head described in (1) above, the branched flow channel member has a bottom portion (for example, bottom portion 233) located above the flow channel member and a peripheral wall portion (for example, peripheral wall portion 234) rising from the bottom portion, the bottom portion has a contact surface with the flow channel member and a box bottom surface located opposite the contact surface, and the height of the peripheral wall portion with respect to the box bottom surface may be greater than 20% of the width of the bottom portion in the short direction. 【0120】 (3) In the droplet discharge head described in (2) above, the peripheral wall portion may further have an overhang portion (for example, an overhang portion 234a) that protrudes outward toward the branched flow channel member. 【0121】 (4) Any one of the droplet dispensing heads described in (1) to (3) above may have an elastic member (for example, an elastic member 60) between the branched flow channel member and the reservoir. 【0122】 (5) Any one of the droplet dispensing heads described in (1) to (4) above may have an O-ring (for example, an O-ring 80) between the branch channel member and the reservoir to seal the connection between the branch channel and the reservoir. 【0123】 (6) In any one of the droplet dispensing heads described in (1) to (5) above, the branched flow channel member and the reservoir may be fixed at both ends in the longitudinal direction of the droplet dispensing head. 【0124】 (7) In any one of the droplet discharge heads described in (1) to (6) above, the branched flow channel member and the reservoir may be fixed together by a waterproof fixing material (for example, fixing materials 90a and 90b). 【0125】 (8) Any one of the droplet dispensing heads described in (1) to (7) above may further have a plate-shaped heat sink that is long in the longitudinal direction of the droplet dispensing head, and the heat sink, the branch channel member and the reservoir may be fixed together by a waterproof fixing material (for example, fixing material 70d). 【0126】 (9) Any one of the droplet discharge heads described in (1) to (8) above further comprises a plate-shaped heat sink that is elongated in the longitudinal direction of the droplet discharge head, the branch channel member and the reservoir are fixed together by a first waterproof fixing material (for example, fixing materials 90a and 90b), the branch channel member and the reservoir and the heat sink are fixed together by a second waterproof fixing material (for example, fixing material 70d), and the area of ​​the gap between the branch channel member and the reservoir and the heat sink that is in contact with the first fixing material and the second fixing material may be sealed with a caulking material. 【0127】 (10) Any one of the droplet dispensing heads described in (1) to (9) above further comprises a head cover attached to the head body and a plate-shaped heat sink that is long in the longitudinal direction of the droplet dispensing head, wherein the reservoir and the heat sink are fixed together by a second waterproof fixing material, and the head cover and the heat sink are fixed together by a third waterproof fixing material (for example, fixing materials 70a to 70c), and the area of ​​the gap between the reservoir and the head cover and the heat sink where neither the second nor the third fixing material is present may be sealed with a caulking material. 【0128】 (11) Any one of the droplet dispensing heads described in (1) to (10) above further comprises a plate-shaped heat sink that is elongated in the longitudinal direction of the droplet dispensing head, and the heat sink and the reservoir are fixed together by a fixing member (for example, a fixing member 50) which has a shaft portion having a spiral groove on its outer circumference and a head portion located at the end of the shaft portion, and the heat sink may have a recess (for example, a recess 47) for accommodating the head portion. 【0129】 (12) In any one of the droplet dispensing heads described in (2) to (11) above, a portion of the reservoir may be located in the region surrounded by the bottom and peripheral wall of the branched flow channel member. 【0130】 (13) Any one of the droplet dispensing heads described in (1) to (12) above includes a driver IC that controls the drive of the head body, a heat sink that dissipates heat generated by the driver IC, and a fixing part (for example, fixing parts 161c, 162c, 163d) that is directly or indirectly fixed to the branched flow channel member, and the heat sink and the fixing part may be fixed at both ends in the longitudinal direction of the head body. 【0131】 (14) The droplet ejection head described in (13) further includes a pressing member that presses the driver IC against the heat sink, and the fixing portion may be provided at both ends of the pressing member in the longitudinal direction of the droplet ejection head. 【0132】 (15) The droplet ejection head described in (13) above has a driver IC mounted on it and comprises a flexible substrate electrically connected to the head body, a wiring board electrically connected to the flexible substrate (for example, a wiring board 32), and a plurality of support members (for example, support members 160) that support the wiring board, wherein the plurality of support members include a first support member (for example, a first support member 161) that supports one end of the wiring board in the longitudinal direction of the droplet ejection head, and a second support member (for example, a second support member 162) that supports the other end of the wiring board in the longitudinal direction of the droplet ejection head, and fixing parts may be provided on the first support member and the second support member. 【0133】 (16) The droplet discharge head described in (15) above has two heat sinks located at both ends in the width direction of the head body, at least two first male screws (for example, first male screws 190) inserted through one of the two heat sinks, and at least two second male screws (for example, second male screws 191) inserted through the other of the two heat sinks, and the first support member and the second support member have a cylindrical portion (for example, a cylindrical portion 167) that is open at both ends in the width direction of the head body and has screw grooves formed on its inner circumferential surface, and the first male screws and the second male screws may be fastened to the same cylindrical portion. 【0134】 (17) Any one of the droplet dispensing heads described in (13) to (16) above may further include a resin plate member (for example, a plate member 170) that joins the heat sink and the branch channel member. 【0135】 (18) The droplet dispensing device may have one of the droplet dispensing heads described in (1) to (17) above, and a control unit that controls the droplet dispensing head. 【0136】 The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. Indeed, the embodiments described above can be embodied in a variety of forms. Furthermore, the embodiments described above may be omitted, replaced, or modified in various ways without departing from the scope and spirit of the appended claims. [Explanation of symbols] 【0137】 1. Printer 6 Conveyor rollers 7 frames 8 droplet dispensing heads 20 Head Body 21 Flow channel member 22 Piezoelectric actuator substrate 23 Branch channel member 231 Branch channel 233 Bottom 234 Peripheral wall section 24 Reservoir 30 Wiring section 40 headcovers 41 Through hole 45 Heat sink 46 Through hole 47 Recess 50 Fixing member 60 Elastic members 70a~70d Fixing material 80 O-rings

Claims

[Claim 1] A flow channel member having multiple discharge holes from which droplets are discharged, A branch channel member located above the channel member and having a branch channel connected to the channel member, A reservoir located above the branch channel member and supplying liquid to the branch channel member, A plate-shaped heat sink that is long in the longitudinal direction of the droplet ejection head and It has, The aforementioned branch channel member is box-shaped, The branch channel member and the reservoir are fixed together by a first fixing material that has waterproof properties. The branch channel member and the reservoir and the heat sink are fixed together by a second waterproof fixing material. A droplet dispensing head in which the region of the gap between the branch channel member and the reservoir and the heat sink where the first fixing member and the second fixing member come into contact is sealed with a caulking material. [Claim 2] A flow channel member having a plurality of discharge holes from which droplets are discharged, A branch channel member located above the channel member and having a branch channel connected to the channel member, A reservoir located above the branch channel member and supplying liquid to the branch channel member, A head cover that attaches to the head body, A plate-shaped heat sink that is long in the longitudinal direction of the droplet ejection head and It has, The aforementioned branch channel member is box-shaped, The reservoir and the heat sink are fixed together by a second waterproof fixing material. The head cover and the heat sink are fixed together by a third fixing material that has waterproof properties. A droplet dispensing head in which the area of ​​the gap between the reservoir and the head cover and the heat sink in which neither the second fixing material nor the third fixing material is present is sealed with a caulking material. [Claim 3] A flow channel member having a plurality of discharge holes from which droplets are discharged, A branch channel member located above the channel member and having a branch channel connected to the channel member, A reservoir located above the branch channel member and supplying liquid to the branch channel member, A driver IC that controls the drive of the head body, A heat sink for dissipating the heat generated by the driver IC, A fixing part directly or indirectly fixed to the branch channel member, A flexible circuit board is mounted on the aforementioned driver IC and is electrically connected to the head body, A wiring board electrically connected to the aforementioned flexible substrate, A plurality of support members that support the aforementioned wiring board It has, The aforementioned plurality of support members are A first support member that supports one end of the wiring board in the longitudinal direction of the droplet dispensing head, A second support member that supports the other end of the wiring board in the longitudinal direction of the droplet dispensing head and Includes, The aforementioned branch channel member is box-shaped, The heat sink and the fixing part are fixed at both ends in the longitudinal direction of the droplet dispensing head. The fixed portion is a droplet dispensing head provided on the first support member and the second support member. [Claim 4] The branch channel member has a bottom portion located above the channel member and a peripheral wall portion rising from the bottom portion. The bottom portion has a contact surface with the flow channel member and a box bottom surface located opposite the contact surface. The droplet dispensing head according to any one of claims 1 to 3, wherein the height of the peripheral wall portion with respect to the bottom surface of the box is greater than 20% of the width of the bottom in the short direction. [Claim 5] The droplet dispensing head according to claim 4, wherein the peripheral wall portion further comprises an overhang portion that extends outward toward the branch channel member. [Claim 6] A droplet dispensing head according to any one of claims 1 to 3, comprising an elastic member between the branched flow channel member and the reservoir. [Claim 7] A droplet dispensing head according to any one of claims 1 to 3, further comprising an O-ring between the branch channel member and the reservoir, which seals the connection between the branch channel and the reservoir. [Claim 8] The droplet dispensing head according to any one of claims 1 to 3, wherein the branch channel member and the reservoir are fixed at both ends in the longitudinal direction of the droplet dispensing head. [Claim 9] The droplet dispensing head according to claim 8, wherein the branch channel member and the reservoir are fixed together by a waterproof fixing material. [Claim 10] The droplet dispensing head according to any one of claims 1 to 3, wherein the heat sink, the branch channel member, and the reservoir are fixed together by a waterproof fixing material. [Claim 11] The branch channel member and the reservoir are fixed together by a first fixing material that has waterproof properties. The branch channel member and the reservoir and the heat sink are fixed together by a second waterproof fixing material. The droplet dispensing head according to claim 3, wherein the region of the gap between the branch channel member and the reservoir and the heat sink where the first fixing member and the second fixing member are in contact is sealed with a caulking material. [Claim 12] Head cover to be attached to the head body It further possesses, The reservoir and the heat sink are fixed together by a second waterproof fixing material. The head cover and the heat sink are fixed together by a third fixing material that has waterproof properties. The droplet dispensing head according to claim 3, wherein the region of the gap between the reservoir and the head cover and the heat sink in which neither the second fixing material nor the third fixing material is present is sealed with a caulking material. [Claim 13] The heat sink and the reservoir are fixed together by a fixing member having a shaft portion having a spiral groove on its outer circumference and a head portion located at the end of the shaft portion. The droplet dispensing head according to any one of claims 1 to 3, wherein the heat sink has a recess for accommodating the head. [Claim 14] The droplet dispensing head according to claim 4, wherein a portion of the reservoir is located in the region enclosed by the bottom and the peripheral wall of the branched flow channel member. [Claim 15] A driver IC that controls the drive of the head body, A fixing part directly or indirectly fixed to the branch channel member and It has, The droplet dispensing head according to claim 1 or 2, wherein the heat sink and the fixing portion are fixed at both ends in the longitudinal direction of the droplet dispensing head. [Claim 16] The driver IC further comprises a pressing member that presses against the heat sink, The droplet dispensing head according to claim 15, wherein the fixing portion is provided at both ends of the pressing member in the longitudinal direction of the droplet dispensing head. [Claim 17] A flexible circuit board is mounted on the aforementioned driver IC and is electrically connected to the head body, A wiring board electrically connected to the aforementioned flexible substrate, A plurality of support members that support the aforementioned wiring board It has, The aforementioned plurality of support members are A first support member that supports one end of the wiring board in the longitudinal direction of the droplet dispensing head, A second support member that supports the other end of the wiring board in the longitudinal direction of the droplet dispensing head and Includes, The droplet dispensing head according to claim 15, wherein the fixing portion is provided on the first support member and the second support member. [Claim 18] The two heat sinks located at both ends in the width direction of the droplet dispensing head, At least two first male screws are inserted through one of the two heat sinks, At least two second male screws are inserted into the other of the two heat sinks and It has, The first support member and the second support member each have a cylindrical portion with both ends open in the width direction of the droplet dispensing head and a screw groove formed on its inner circumferential surface. The droplet dispensing head according to claim 3, wherein the first male screw and the second male screw are fastened to the same cylindrical portion. [Claim 19] The droplet dispensing head according to claim 15, further comprising a resin plate member that joins the heat sink and the branch channel member. [Claim 20] A droplet dispensing head according to any one of claims 1 to 3, A control unit that controls the droplet dispensing head and A droplet dispensing device having the following features.

Images