JP2007203528A - Liquid droplet discharge unit and liquid droplet discharge device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a heat dissipation property of each driver IC and the assembling property of parts making each of the driver ICs dissipate heat, space efficiency and maintainability of an inkjet recording head unit with a plurality of driver ICs. <P>SOLUTION: Many piezoelectric elements provided in a long recording head 32 of the inkjet recording head unit are driven by the driver ICs 80. The driver ICs 80 and heat pipes 90 are provided at a ratio of one to one. The heat pipes 90 are connected to the driver ICs 80 in a state of being able to transmit heat. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a droplet discharge unit that discharges droplets from a nozzle, and a droplet discharge device including the droplet discharge unit.

  In a droplet discharge unit such as an ink jet recording head unit that discharges ink droplets from a nozzle to a recording medium, a driving unit such as a piezoelectric actuator changes the volume of the pressure chamber to transfer the liquid filled in the pressure chamber into the pressure chamber. It discharges as a droplet from the connected nozzle. Since the driving unit is provided corresponding to each pressure chamber, the number of the driving units is very large in the case of a long droplet discharge head whose width is equal to or larger than the width of the recording medium. With the recent demand for higher printing speed, the driving speed of the drive unit has been increased. For this reason, the amount of heat generated by the drive element that drives the drive unit by transmitting an electric signal to the drive unit is increased, and the drive element is easily damaged by heat, so that the reliability of the drive element is improved. A method of radiating heat from the drive element using a heat sink has been devised (for example, see Patent Document 1). Also, a method of radiating heat from the droplet discharge head itself using a heat pipe has been devised (see, for example, Patent Documents 2 and 3).

  Here, in the case of a long droplet discharge head, it is difficult to electrically connect a large number of driving units to a single driving element. Therefore, a large number of driving units are divided into a plurality of sections. A drive element is provided for each. On the other hand, in the ink jet recording head unit described in Patent Document 1, one long heat sink is provided for one long ink jet recording head. For this reason, there is a problem that a plurality of drive elements must be connected to one heat sink, and the assembly work of the heat sink becomes complicated. In addition, when a long ink jet recording head is configured by connecting a plurality of short ink jet recording heads, replacement of each short ink jet recording head cannot be performed. Will have to be replaced. As a result, there has been a waste of replacing even a short inkjet recording head that does not need to be replaced.

  Further, in order to increase the heat dissipation of the drive element by the heat sink, the surface area of the heat sink must be increased, so that the space occupied by the heat sink is widened and the inkjet recording head unit is enlarged.

Further, in the ink jet recording head units described in Patent Documents 2 and 3, since one long heat pipe is provided for one long ink jet recording head, a plurality of driving elements are used by using this heat pipe. When radiating heat from the printer, it is necessary to connect a plurality of drive elements to a single heat pipe, which complicates the work of assembling the heat pipe and wastes when replacing the inkjet recording head. To do.
JP 2003-311953 A Japanese Patent No. 2723998 Japanese Patent No. 2732693

  The present invention has been made in consideration of the above facts, and in a droplet discharge unit including a plurality of driving elements, while improving the heat dissipation of the driving elements, the assemblability of parts that radiate the driving elements, space efficiency, The maintainability of the droplet discharge unit is improved.

  The droplet discharge unit according to claim 1, wherein a plurality of nozzles, a plurality of pressure chambers each of which is filled with a liquid are communicated with each nozzle, and each nozzle is configured by changing the volume of each pressure chamber. A droplet discharge head comprising a plurality of drive means for discharging droplets from the liquid and a plurality of drive elements each driving one of the plurality of drive means, each connected to each drive element so as to be capable of transferring heat And a plurality of heat pipes that move heat to one end side in the axial direction.

  The droplet discharge head of the droplet discharge unit according to claim 1 is provided with a plurality of nozzles, a plurality of pressure chambers, a plurality of drive units, and a plurality of drive elements. In this droplet discharge head, each pressure chamber filled with liquid is communicated with each nozzle, and when any one of a plurality of driving means is driven by each driving element, the volume of each pressure chamber is driven by the driving means. Is changed and droplets are discharged from each nozzle.

  In addition, a heat pipe is connected to each drive element so that heat can be transferred, and heat generated by the drive element is transferred to the heat pipe and moves to one end side in the axial direction of the heat pipe. As a result, heat dissipation of the drive element is promoted, so that the drive element can be prevented from being destroyed.

  Here, instead of connecting a plurality of driving elements to one heat pipe, one or more heat pipes are provided for each driving element, and each heat pipe is connected to each driving element. By configuring as described above, the assemblability is improved as compared with the case of connecting a heat radiating component such as one heat pipe or heat sink to a plurality of driving elements.

  When a long droplet discharge head is configured by connecting a plurality of short droplet discharge heads each having a drive element, the short droplet discharge head and the heat pipe are combined into a single unit. Therefore, the droplet discharge head can be replaced for each short droplet discharge head. Therefore, useless replacement of the droplet discharge head is eliminated, and an increase in running cost of the droplet discharge head can be suppressed.

  In addition, compared with a case where one heat pipe is connected to a plurality of drive elements, the heat dissipation of each drive element is increased, and the reliability of the drive element is destroyed and the quality is lowered.

  In addition, heat pipes have a higher degree of freedom in shape and better space efficiency than heat sinks and other heat-dissipating parts. Can be miniaturized.

  The droplet discharge unit according to claim 2 is the droplet discharge unit according to claim 1, wherein the droplet discharge unit is connected to one end portion in the axial direction of the heat pipe so as to be capable of transferring heat and receives heat from the heat pipe. It has the member.

  In the droplet discharge unit according to the second aspect, the heat receiving member is connected to one end portion in the axial direction of the heat pipe so that heat can be transferred, and the heat receiving member receives heat from the one end portion in the axial direction of the heat pipe. Thereby, the movement of heat in the heat pipe is promoted, and the heat radiation of the driving element is promoted.

  The droplet discharge unit according to claim 3 is the droplet discharge unit according to claim 2, wherein a tank for storing liquid and the heat receiving member are connected so as to be capable of transferring heat, and the pressure chamber is connected to the tank. And a liquid supply path for supplying a liquid to the liquid crystal.

  In the droplet discharge unit according to the third aspect, the liquid stored in the tank is supplied to the pressure chamber through the liquid supply path. Here, the heat receiving member is connected to the liquid supply path so as to be able to transfer heat, and the heat of the drive element is transferred to the liquid in the liquid supply path via the heat pipe and the heat receiving member. As a result, the temperature of the liquid supplied to the pressure chamber rises and the viscosity of the liquid decreases, so that droplets can be ejected regardless of the use state or environment.

  The droplet discharge unit according to claim 4 is the droplet discharge unit according to claim 2, wherein a tank for storing liquid, a liquid supply path for supplying liquid from the tank to the pressure chamber, The heat receiving member is connected to be able to transfer heat, and has a liquid recirculation path for recirculating liquid from the pressure chamber to the tank.

  In the droplet discharge unit according to the fourth aspect, the liquid stored in the tank is supplied to the pressure chamber by the liquid supply path, and the liquid is refluxed from the pressure chamber to the tank by the liquid reflux path. Here, a heat receiving member is connected to the liquid reflux path so that heat can be transferred, and heat of the drive element is transmitted to the liquid in the liquid reflux path via the heat pipe and the heat receiving member. As a result, the temperature of the liquid circulating between the tank and the pressure chamber rises, and the viscosity of the liquid decreases, so that droplets can be ejected regardless of the use state or environment.

  By the way, oxygen may be dissolved in the liquid, and when such a liquid is heated, oxygen appears as bubbles, but in the present invention, the liquid that is refluxed to the tank through the liquid reflux path is heated. As a result, the generated bubbles move to the tank together with the liquid. Bubbles that flow into the tank can be released to the atmosphere by opening the tank to the atmosphere, so that bubbles generated by heating the liquid can be prevented from flowing into the pressure chamber, Deterioration of discharge performance can be prevented.

  According to a fifth aspect of the present invention, there is provided a liquid droplet ejection apparatus comprising: the liquid droplet ejection unit according to any one of the first to fourth aspects; and a transport unit that transports a recording medium to face the nozzle. Features.

  In the liquid droplet ejection apparatus according to the fifth aspect, the recording medium is conveyed by the conveying means so as to face the nozzles of the liquid droplet ejection head. At this time, a plurality of driving units are driven by the plurality of driving elements, and the volumes of the plurality of pressure chambers are changed to eject droplets from the plurality of nozzles, thereby forming an image or the like on the recording medium.

  Here, as described above, by using a heat pipe as a component for radiating heat from the drive element, and suppressing the increase in size of the droplet discharge unit, the increase in size of the droplet discharge device can be suppressed.

  Since the present invention is configured as described above, in the droplet discharge unit including a plurality of drive elements, the heat dissipation of the drive elements is improved, the assembly of parts for radiating the drive elements, the space efficiency, and the maintenance of the droplet discharge units. Improves.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an ink jet recording apparatus 12 of the present embodiment. A paper feed tray 16 is provided in the lower part of the casing 14 of the ink jet recording apparatus 12, and the sheets P stacked in the paper feed tray 16 can be taken out one by one by a pickup roll 18. The taken paper P is transported by a plurality of transport roller pairs 20 constituting a predetermined transport path 22.

  Above the paper feed tray 16, an endless transport belt 28 stretched around a drive roll 24 and a driven roll 26 is disposed. A recording head array 30 is disposed above the conveyor belt 28 and faces the flat portion 28F of the conveyor belt 28. This opposed area is an ejection area SE where ink droplets are ejected from the recording head array 30. The sheet P transported along the transport path 22 is held by the transport belt 28 and reaches the discharge area SE, and ink droplets corresponding to image information are attached from the recording head array 30 in a state of facing the recording head array 30. The

  In this embodiment, the recording head array 30 has a long shape in which the effective recording area is equal to or larger than the width of the paper P (the length in the direction orthogonal to the transport direction), and is yellow (Y) and magenta (M). , Cyan (S), and four inkjet recording heads (hereinafter referred to as recording heads) 32 corresponding to the four colors of black (K) are arranged along the transport direction, so that a full-color image can be recorded. ing.

  Each recording head 32 is controlled by a head drive circuit (not shown). The head drive circuit has a configuration in which, for example, the ejection timing of ink droplets and the ink ejection port (nozzle) to be used are determined according to image information and a drive signal is sent to the recording head 32.

  The recording head array 30 may be stationary in a direction orthogonal to the transport direction. However, if the recording head array 30 is configured to move as necessary, an image with higher resolution can be obtained by multi-pass image recording. Or the failure of the recording head 32 is not reflected in the recording result.

  Four maintenance units 34 corresponding to the respective head units 32 are arranged on both sides of the recording head array 30. As shown in FIG. 2, when performing maintenance on the head unit 32, the recording head array 30 moves upward, and the maintenance unit 34 moves into the gap formed between the conveyance belt 28 and enters. Then, a predetermined maintenance operation (suction, wiping, capping, etc.) is performed while facing the nozzle surface 32N (see FIG. 3).

  As shown in FIG. 3, a charging roll 36 to which a power source 38 is connected is disposed on the upstream side of the recording head array 30. The charging roll 36 is driven while sandwiching the conveyance belt 28 and the paper P with the driven roll 26, and moves between a pressing position for pressing the paper P against the conveyance belt 28 and a separation position separated from the conveyance belt 28. It is possible. At the pressing position, a predetermined potential difference is generated between the grounded driven roll 26 and the sheet P can be charged and electrostatically attracted to the transport belt 28.

  A separation plate 40 is disposed on the downstream side of the recording head array 30 and separates the paper P from the conveyance belt 28. The peeled paper P is transported by a plurality of discharge roller pairs 42 that constitute a discharge path 44 on the downstream side of the peeling plate 40, and is discharged to a paper discharge tray 46 provided on the top of the housing 14.

  As shown in FIGS. 1 and 2, a main ink tank 54 that stores ink of each color is disposed above the recording head array 30. As shown in FIG. 4, each main ink tank 54 is connected to a recording head 32 provided in an inkjet recording head unit (hereinafter referred to as a head unit) 10.

Hereinafter, the configuration of the head unit 10 will be described. Here, one head unit 10 will be described, but the other head units 10 have the same configuration.
[First Embodiment]
As shown in FIGS. 4 and 5, in the head unit 10, the recording head 32 has a configuration in which a plurality of (for example, five as shown) short recording heads 33 are arranged in the width direction of the paper P. . In each recording head 33, the nozzles 50 are arranged in two rows in the width direction of the paper P.

  As shown in FIG. 6, in each recording head 33, a nozzle plate 33A, a flow path plate 33B, and a vibration plate 33C are laminated. The nozzle 50 is formed in the nozzle plate 33A, the pressure chamber 52 in a state where the joint surface with the vibration plate 33C is dug down, the manifold 54 in the state where the joint surface with the nozzle plate 33A is dug down, and the manifold An ink channel 56 </ b> A that connects the pressure chamber 52 and the pressure chamber 52 and an ink channel 56 </ b> B that communicates the pressure chamber 52 and the nozzle 50 are formed. The flow path plate 33B is formed by laminating a plurality of plates each having a hole for forming the pressure chamber 52, the manifold 54, and the ink flow paths 56A and 56B.

  A piezoelectric element 58 is bonded to the back side of each pressure chamber 52 side of the diaphragm 33C. The wiring of the flexible printed wiring board 60 is soldered to the piezoelectric element 58. Further, a block 64 in which an ink chamber 62 is formed is joined on the vibration plate 33C with the flexible printed wiring board 60 interposed therebetween. The ink chamber 62 communicates with the manifold 54 through an ink flow path (not shown), and also communicates with an ink supply path branch 66 inserted into the block 64.

  As shown in FIGS. 4 to 6, the plurality of ink supply path tributaries 66, each inserted into each recording head 33, are branched from the ink supply path 70. One end of the ink supply path 70 is inserted into the sub ink tank 68. In addition, one end of an ink supply path 72 is inserted into the sub ink tank 68. The other end of the ink supply path 72 is inserted into the main ink tank 54. The ink supply path 72 and the ink supply path 70 are respectively provided with pumps 74 and 76, and the ink is supplied from the main ink tank 54 to the sub ink tank 68 by driving the pump 74, and the ink is supplied to the sub ink tank 68. The ink is supplied from the sub ink tank 68 to each recording head 33 by driving the pump 76, and the ink chamber 62, the manifold 54, the pressure chamber 52, and the ink flow paths 56A and 56B are filled with ink.

  Further, the flexible printed wiring board 60 in which the wiring is electrically connected to the piezoelectric element 58 is routed from the lower side of the block 64 to the upper side through the side wall. In the flexible printed wiring board 60, a plurality of wirings each electrically connected to each piezoelectric element 58 and a plurality of terminals of the driver IC 80 are electrically and mechanically connected by solder. A plurality of wirings of the flexible printed wiring board 60 solder-connected to a plurality of elements of the driver IC 80 are connected to the head driving circuit by a cable 78.

  The head drive circuit selects the driver IC 80 according to the image information, and transmits a drive signal to the selected driver IC. Then, the driver IC 80 that has received the drive signal selects the piezoelectric element 58 according to the drive signal, and applies a voltage to the selected piezoelectric element 58. The piezoelectric element 58 to which the voltage is applied is bent to change the volume of the pressure chamber 52, and the ink filled in the pressure chamber 52 is ejected from the nozzle 50.

  Here, one end of the heat pipe 90 in the axial direction is connected to each driver IC 80 by a highly heat-conductive connecting member 82 so that heat can be transferred to the driver IC 80. It is transmitted to.

  When heat is input to the heat pipe 90, the liquid in the pipe of the heat pipe 90 evaporates, and a steam flow is generated from the other end side in the high temperature axial direction to one end side in the low temperature axial direction. Condenses and releases latent heat. Then, the liquid formed by condensing the vapor returns to the other end side in the axial direction. In this way, the heat pipe 90 moves the heat of the driver IC 80 from the other end side in the axial direction to one end side.

  Further, the heat pipe 90 is bent at a substantially right angle in the central portion in the axial direction, and the other end side in the axial direction of the heat pipe 90 extends upward between the adjacent flexible printed wiring boards 60. . The other end of the heat pipe 90 in the axial direction is joined to a heat radiating plate 84 formed of a material having high heat radiating properties such as aluminum. Thereby, the movement of heat in the heat pipe 90 is promoted, and the heat radiation of the driver IC 80 is promoted.

  Here, instead of connecting one heat pipe to a plurality of driver ICs 80, a plurality of heat pipes 90 and a plurality of driver ICs 80 are provided in a one-to-one ratio, and each driver IC 90 is connected to each heat pipe 90. Since they are connected, the short recording head 33, the flexible printed wiring board 60, the driver IC 80, and the heat pipe 90 can be made into a single unit. As a result, the heat pipe 90 can be assembled in units, so that the assemblability is improved. In addition, since the recording head 32 can be replaced for each short recording head 33 and the unnecessary replacement of the short recording head 33 can be eliminated, the running cost of the recording head 32 can be suppressed.

  In addition, compared with the case where one heat pipe is connected to a plurality of driver ICs 80, the heat dissipation of the driver IC 80 is increased, and the reliability of the driver IC 80 with respect to destruction and quality deterioration is increased.

  Further, in the present embodiment, the heat pipe 90 is refracted into an L shape and disposed in a vacant space, so that the heat pipe 90 has a high degree of freedom in shape and high space efficiency, so the head unit 10 can be downsized. .

  Here, as shown in FIG. 7, when the heat sink 21 is used as a means for radiating heat from the driver IC 80, the fins 21 </ b> A of the heat sink 21 project in the transport direction, and the interval between the recording heads 32 aligned in the transport direction is widened. Therefore, not only the head unit 10 is increased in size, but also the difficulty in adjusting the registration is increased.

  On the other hand, as shown in FIG. 6, the heat pipe 90 in the present embodiment is much smaller in the transport direction than the fins 21 </ b> A of the heat sink 21, and the recording heads 32 aligned in the transport direction are arranged. Since the interval can be narrowed, the head unit 10 can be miniaturized and the registration can be easily adjusted.

  Moreover, since the heat pipe 90 is a semi-permanent part that does not require maintenance, there is no running cost.

  In the present embodiment, as shown in FIG. 8, the heat pipe 90 is fitted into the connection member 82 in which the groove 82 </ b> A along the peripheral surface of the heat pipe 90 is formed, and is fixed by a method such as adhesion. The heat pipe 90 is connected to the surface of the driver IC 80 by fixing 82 to the surface of the driver IC 80 by a method such as adhesion, but other connection structures are also applicable.

  For example, as shown in FIG. 9, a part of the heat pipe 90 may be formed flat, and the flat part may be connected to the surface of the driver IC 80 by a method such as adhesion. In this case, the contact area between the heat pipe 90 and the driver IC 80 is larger than that of the connection structure shown in FIG. 9, and since the heat pipe 90 and the driver IC 80 are in direct contact, the heat dissipation of the driver IC 80 is shown in FIG. Higher than the connection structure.

  Further, as shown in FIG. 10, the entire heat pipe 90 may be formed flat. In addition, as a method of maintaining the contact state between the heat pipe 90 and the driver IC 80, adhesion or pressure welding may be used. However, when bonding, it is desirable to use an adhesive having high heat conductivity. It is desirable to interpose a heat transfer accelerator such as silicone oil having high heat transfer property.

[Second Embodiment]
As shown in FIGS. 11 and 12, the head unit 100 is provided with an ink circulation path 102 that circulates ink between the sub ink tank 68 and the recording head 32. The ink circulation path 102 includes an ink supply path 102A for supplying ink from the sub ink tank 68 to the recording head 32, and an ink return path 102B for returning ink from the recording head 32 to the sub ink tank 68. The plate 84 is connected to the ink supply path 102A and the ink reflux path 102B so as to be able to transfer heat. The ink circulation path 102 is formed of a metal or resin having high heat conductivity.

  Therefore, the heat generated in the driver IC 80 is transmitted to the ink supply path 102A and the ink return path 102B via the heat pipe 90 and the heat radiating plate 84, and the ink flowing in the ink supply path 102A and the ink return path 102B is heated. The As a result, the viscosity of the ink is lowered, so that the ink can be ejected regardless of the use state or environment.

Further, by circulating the ink between the sub ink tank 68 and the recording head 32, the temperature of the whole ink in the ink circulation system becomes constant at a high level and the viscosity becomes constant at a low level. As a result, stable ink ejection can be performed continuously.
[Third embodiment]
As shown in FIGS. 13 and 14, in the head unit 200, the heat radiating plate 84 is connected to the ink reflux path 102 </ b> B so that heat can be transferred. For this reason, the ink returning to the sub ink tank 68 is heated and reduced in viscosity when passing through the heat receiving portion from the heat dissipation plate 84 of the ink return path 102B.

  By the way, oxygen is dissolved in the ink, and when the ink is heated, the oxygen appears as bubbles, but in this embodiment, the ink returning to the sub ink tank 68 through the ink reflux path 102B is heated. Therefore, the generated bubbles move to the sub ink tank 68 together with the ink. Here, the sub ink tank 68 is open to the atmosphere, and the bubbles flowing into the sub ink tank 68 are released into the atmosphere. Accordingly, since bubbles generated by heating the ink can be prevented from flowing into the recording head 32, deterioration of the ink ejection performance can be prevented.

  In the configuration in which the heat radiating plate 84 is connected to the ink supply path 102 </ b> A and the ink supplied to the recording head 33 is heated, there may be a difference in the temperature of the ink supplied to each recording head 33. For example, there is a case in which the amount of ink discharged from the central recording head 33 is prominent and only the driver IC 80 that drives the recording head 33 becomes hot. In this case, in the ink supply path 102A, the ink is heated to a high temperature on the downstream side in the circulation direction with respect to the heat sink 84 connected to the driver IC 80, and on the upstream side in the circulation direction with respect to the heat sink 84, Since the ink is not heated and becomes a low temperature, the high-temperature ink is supplied from the center to the recording head 33 on the downstream side in the circulation direction, and the low-temperature ink is supplied to the recording head 33 on the upstream side in the circulation direction from the center. . As a result, there is a difference in the ink ejection performance for each recording head 33.

  On the other hand, in the present embodiment, the heat radiating plate 84 is connected to the ink reflux path 102B, and the ink returning from the recording head 33 to the sub ink tank 68 is heated, so that it is supplied to each recording head 33. The temperature difference between the inks can be suppressed, and the difference in ink ejection performance for each recording head 33 can be suppressed.

  In the first to third embodiments, the present invention has been described by taking the ink jet recording apparatus as an example. However, the liquid droplet ejection head of the present invention is not limited to the ink jet recording head, and is colored on a polymer film or glass. Production of display color filter by discharging ink, formation of bump for component mounting by discharging molten solder onto substrate, formation of EL display panel by discharging organic EL solution onto substrate In addition, the present invention is applicable to general liquid droplet ejection heads intended for various industrial uses such as formation of bumps for electrical mounting performed by discharging molten solder onto a substrate.

  In addition, the “recording medium” that is a target of image recording in the droplet discharge device of the present invention includes a wide range of objects as long as the droplet discharge head discharges droplets. Therefore, the recording medium includes a recording sheet, an OHP sheet, and the like, but also includes, for example, a substrate on which a wiring pattern or the like is formed.

1 is a diagram showing an outline of an ink jet recording apparatus according to an embodiment of the present invention. 1 is a diagram showing an outline of an ink jet recording apparatus according to an embodiment of the present invention. It is a figure which shows the outline of the printing part of the inkjet recording device of embodiment of this invention. It is a figure which shows 1st Embodiment of the inkjet recording head unit with which the inkjet recording device of FIG. 1, FIG. 2 was equipped. It is a perspective view which shows the inkjet recording head unit of FIG. FIG. 6 is a cross-sectional view taken along 6-6 in FIG. 5. It is sectional drawing which shows the conventional inkjet recording head unit. FIG. 7 is a perspective view showing a connection structure between a heat pipe and a driver IC in the ink jet recording head unit of FIGS. 4 to 6. FIG. 7 is a perspective view illustrating a modified example of a connection structure between a heat pipe and a driver IC in the ink jet recording head unit of FIGS. 4 to 6. FIG. 7 is a perspective view illustrating a modified example of a connection structure between a heat pipe and a driver IC in the ink jet recording head unit of FIGS. 4 to 6. It is a figure which shows 2nd Embodiment of the inkjet recording head unit with which the inkjet recording device of FIG. 1, FIG. 2 was equipped. It is sectional drawing which shows the inkjet recording head unit of FIG. It is sectional drawing which shows 3rd Embodiment of the inkjet recording head unit with which the inkjet recording apparatus of FIG. 1, FIG. 2 was equipped. It is sectional drawing which shows the inkjet recording head unit of FIG.

Explanation of symbols

10 Inkjet recording head unit (droplet discharge unit)
12 Inkjet recording device (droplet ejection device)
28 Conveying belt (conveying means)
32 Inkjet recording head (droplet ejection head)
50 Nozzle 52 Pressure chamber 58 Piezoelectric element (driving means)
66 Ink supply path tributary (liquid supply path)
68 Sub-ink tank (tank)
70 Ink supply path (liquid supply path)
80 Driver IC (Drive element)
84 Heat sink (heat receiving member)
90 Heat Pipe 100 Inkjet Recording Head Unit (Droplet Discharge Unit)
102A Ink supply path (liquid supply path)
102B Ink reflux path (liquid reflux path)
200 Inkjet recording head unit (droplet discharge unit)
P paper (recording medium)

Claims (5)

Multiple nozzles,
A plurality of pressure chambers in which each chamber filled with liquid communicates with each nozzle;
A plurality of driving means each for changing the volume of each pressure chamber and discharging droplets from each nozzle;
A plurality of drive elements each driving any one of the plurality of drive means, and a droplet discharge head comprising:
A plurality of heat pipes each connected to each drive element so as to be capable of transferring heat, and moving heat to one end side in the axial direction;
A droplet discharge unit comprising:   2. The droplet discharge unit according to claim 1, further comprising a heat receiving member connected to one end of the heat pipe in an axial direction so as to be capable of transferring heat and receiving heat from the heat pipe. A tank for storing liquid;
A liquid supply path connected to the heat receiving member so as to be capable of transferring heat, and supplying liquid from the tank to the pressure chamber;
The droplet discharge unit according to claim 2, comprising: A tank for storing liquid;
A liquid supply path for supplying liquid from the tank to the pressure chamber;
A liquid reflux path in which the heat receiving member is connected so as to be capable of transferring heat, and refluxs the liquid from the pressure chamber to the tank;
The droplet discharge unit according to claim 2, comprising: The droplet discharge unit according to any one of claims 1 to 4,
Conveying means for conveying the recording medium to face the nozzle;
A droplet discharge apparatus comprising:

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