JP5957864B2 - Liquid ejecting head and manufacturing method thereof - Google Patents

Description

  The present invention relates to a liquid ejecting head and a liquid ejecting apparatus, and more particularly to an ink jet recording head and an ink jet recording apparatus that eject ink as a liquid.

  A typical example of a liquid ejecting head that ejects liquid is an ink jet recording head that ejects ink. As an ink jet recording head, for example, it has a manifold that stores liquid, takes ink into a pressure generating chamber that communicates with the manifold, deforms the pressure generating chamber with pressure generating means such as a piezoelectric element, and nozzles There is known one provided with a head main body for discharging liquid from the head.

  Such an ink jet recording head has a liquid flow path serving as a flow path for ink supplied to the manifold (see, for example, Patent Document 1). Examples of the liquid flow path include those formed by joining members provided with through holes with an adhesive so that the through holes communicate with each other.

JP-A-11-300987

  Bubbles generated in the liquid flow path are captured by a filter disposed in the liquid flow path, or are sucked out from the nozzle side with a negative pressure to be discharged together with the ink.

  However, when the adhesive that joins the members provided with the through holes reaches the inside of the through holes and hardens, bubbles adhere to the adhesive that protrudes into the through holes and are difficult to be discharged to the outside. That is, the discharge property of the bubbles in the liquid channel is lowered. If bubbles remain in the liquid flow path even when the bubbles are discharged in this way, the bubbles may move to the nozzle side during printing and cause ink ejection failure.

  On the other hand, when the amount of the adhesive is reduced, sufficient adhesive does not reach the bonding surface between the members, and a region not bonded by the adhesive is generated. In this region, there is a possibility that bubbles stay or the ink in the through hole penetrates and reaches the inside of the head through the interface between the adhesive and the member. For example, the ink may reach an electrical component such as a circuit board that controls the ejection of the ink, causing a short circuit or failure.

  As described above, when the members provided with the through holes are joined to each other, there is a problem whether the adhesive applied to the periphery of the through holes is too much or too little. Therefore, it is necessary to appropriately manage the direction and amount of the adhesive spreading around the through hole.

  Such a problem also exists in a liquid ejecting head and a liquid ejecting apparatus that eject liquid other than ink.

  In view of such circumstances, the present invention reliably joins members constituting a liquid flow path with an adhesive, and improves discharge quality by improving the discharge of bubbles in the liquid flow path and the liquid. It aims at providing an injection device.

An aspect of the present invention that solves the above problems includes a head main body that discharges liquid from a nozzle, a liquid channel that is in communication with the nozzle and through which a liquid supplied to the head main body flows, and a part of the liquid channel The first member and the second member joined with an adhesive so that the through holes communicate with each other, and the surface of the first member has a periphery of the through holes. A first protrusion that surrounds and protrudes toward the second member, and a second protrusion that surrounds the outside of the first protrusion and protrudes toward the second member are formed. The first protrusion and the first protrusion The two protrusions have an adhesive surface bonded to the second member side through the adhesive, and are formed so that the distance between the adhesive surface and the second member side is equal, The adhesive provided between the first protrusion and the second protrusion crosses the bonding surface of the first protrusion. Together reach the through hole Te, a liquid-jet head, characterized in that it reaches the outside of the second projection beyond the adhesive surface of the second projection. Here, it is preferable that the adhesive spreads toward the first protrusion and the second protrusion with the groove between the first protrusion and the second protrusion as a center.
In this mode, since the spread of the adhesive between the first protrusion and the second protrusion provided on the first member and the second member can be managed, the adhesive is excessive on the first protrusion side. It is possible to prevent the adhesive from being pulled out between the first protrusion and the second protrusion and the second member. Specifically, the adhesive reaches the through hole (liquid flow path) beyond the bonding surface of the first protrusion and reaches the outside of the second protrusion beyond the bonding surface of the second protrusion. . Thereby, the state where the adhesive is closed is prevented, and bubbles remain in the closed portion, or the liquid reaches the circuit board or the like through the interface between the adhesive and the first member and the second member from the closed portion. Is prevented. As a result, a liquid ejecting head having improved bubble discharge properties and improved reliability is provided.

  Here, out of the through holes of the first member and the second member, the one far from the nozzle is the first through hole, and the one near the nozzle is the second through hole, and the first through hole is the first through hole. The opening shape on the two member side is preferably formed larger than the opening shape on the first member side of the second through hole. According to this, since the second member is located on the downstream side of the adhesive, it is possible to prevent bubbles in the liquid from remaining on the downstream side of the adhesive. Accordingly, since the bubble discharge performance is improved, it is possible to prevent the bubbles from moving to the nozzle side during discharge and causing a liquid discharge failure. Therefore, a liquid jet head with improved discharge quality is provided.

  Further, the first protrusion and the second protrusion are formed so that the height from the surface on the second member side of the first member to the adhesion surface is the same, and the height of the second member The region facing the bonding surface is preferably formed flush. According to this, the spread of the adhesive can be managed even better.

  Further, it is preferable that the first protrusion and the second protrusion are formed so that the widths of the bonding surfaces are the same. According to this, the spread of the adhesive can be managed even better.

  The head body includes a pressure generating chamber communicating with a nozzle for discharging liquid, a plurality of pressure generating means for deforming the pressure generating chamber, and a head case to which the pressure generating means is fixed. Is provided with an insertion hole through which each pressure generating means is inserted, and the through hole, the first protrusion, and the second protrusion are provided so as to be positioned between the insertion holes. preferable. According to this, it is possible to narrow the space | interval of an insertion hole and a 2nd protrusion as much as possible. As a result, in a liquid jet head having a plurality of pressure generating means, it is possible to save space for the size in plan view.

According to another aspect of the invention, there is provided a liquid ejecting apparatus including the liquid ejecting head according to the above aspect.
In such an aspect, there is provided a liquid ejecting apparatus in which the members constituting the liquid flow path are reliably bonded with an adhesive, and the discharge property of the bubbles in the liquid flow path is improved to improve the discharge quality.

1 is a perspective view illustrating a schematic configuration of a recording apparatus according to an embodiment. FIG. 2 is an exploded perspective view of a recording head according to an embodiment. FIG. 2 is a bottom view and a side view of a recording head according to an embodiment. FIG. 4 is a sectional view taken along line AA in FIG. 3. FIG. 4 is a sectional view taken along line BB in FIG. 3. FIG. 3 is a cross-sectional view of a main part of a recording head according to an embodiment. It is principal part sectional drawing of the head main body which concerns on one Embodiment. It is the top view of the surface joined to the diaphragm of a reinforcement member, and its AA sectional view. It is principal part sectional drawing to which the principal part of the head main body which concerns on one Embodiment was expanded. It is principal part sectional drawing to which the principal part of the head main body which concerns on one Embodiment was expanded. It is principal part sectional drawing to which the principal part of the head main body which concerns on one Embodiment was expanded.

<Embodiment 1>
Hereinafter, the present invention will be described in detail based on embodiments. Hereinafter, the ink jet recording head is an example of a liquid ejecting head, and is also simply referred to as a recording head. The ink jet recording apparatus is an example of a liquid ejecting apparatus.

  FIG. 1 is a perspective view showing a schematic configuration of an ink jet recording apparatus according to the present embodiment. The ink jet recording apparatus 1 includes a recording head 2. The recording head 2 is mounted on the carriage 4 together with the ink cartridge 3, and the carriage 4 is provided so as to be movable along the carriage shaft 9.

  A driving force of a driving motor (not shown) is transmitted to the carriage 4 via a plurality of gears and a timing belt 7, so that the carriage 4 on which the recording head 2 is mounted is moved along the carriage shaft 9.

  The position of the carriage 4 in the direction along the carriage axis 9 is detected by the linear encoder 10, and a detection signal is transmitted as position information to a control unit (not shown). Accordingly, the control unit can control the ink ejection operation and the like while recognizing the position of the carriage 4 (recording head 2) based on the position information from the linear encoder 10.

  The ink jet recording apparatus 1 includes a platen 5, and a recording sheet 6, which is a recording medium such as paper fed by a paper feeding mechanism 8, is wound around the platen 5 and conveyed. .

  2 is an exploded perspective view of the recording head, FIG. 3 is a bottom view and a side view of the recording head, FIG. 4 is a cross-sectional view taken along line AA in FIG. 3, and FIG. FIG. 6 is a cross-sectional view taken along the line -B, and FIG.

  As shown in these drawings, the recording head 2 of the present embodiment includes a flow path member 12, a circuit board 13, a head body 14, and a head cover 15.

  The flow path member 12 is a member having a part of a liquid flow path for supplying ink from the ink cartridge 3 to the head main body 14. Specifically, the flow path member 12 is configured by joining a first flow path member 17, a second flow path member 21, and a third flow path member 19.

  The first flow path member 17 includes an ink cartridge mounting portion 22 to which a plurality of ink cartridges 3 are detachably mounted on the upper surface. A plurality of ink introduction needles 23 are formed on the upper surface of the bottom of the ink cartridge mounting portion 22 corresponding to each ink cartridge 3 to be mounted. In the present embodiment, four ink introduction needles 23 are arranged in a row corresponding to inks of four colors (for example, cyan, magenta, yellow, and black).

  A first ink supply path 24 is formed inside the ink introduction needle 23. By inserting the ink introduction needle 23 into the ink cartridge 3, the first ink supply path 24 and the inside of the ink cartridge 3 are communicated.

  Further, as shown in FIG. 5, four concave portions 84 constituting a part of the horizontal flow path 86 are formed on the bottom surface (the surface on the second flow path member 21 side) of the first flow path member 17. . The first ink supply path 24 described above opens at one end of each recess 84.

  As shown in FIGS. 2 and 6, the second flow path member 21 includes a second ink supply path 29 that penetrates in the thickness direction of the second flow path member 21. A filter 20 is disposed in the opening of the second ink supply path 29 on the first flow path member 17 side. Further, the circuit board 13 side of the second ink supply path 29 protrudes to the circuit board 13 side, and is inserted into a flow path insertion hole 34 of the circuit board 13 described later.

  As shown in FIG. 6, the third flow path member 19 is sandwiched between the first flow path member 17 and the second flow path member 21. The third flow path member 19 is a member that defines a horizontal flow path 86 with the first flow path member 17. The horizontal flow path 86 communicates with the first ink supply path 24 and the second ink supply path 29.

  Specifically, each recess 84 (see FIG. 5) of the first channel member 17 is sealed by each projection 85 of the third channel member 19, thereby defining a horizontal channel 86. The convex part 85 comprises a part of horizontal flow path 86, and the four convex parts 85 are provided facing each recessed part 84 of the 1st flow path member 17 (refer FIG. 2). The third flow path member 19 is bonded to the first flow path member 17 with a resin adhesive 102 applied to the peripheral edge of each convex portion 85. Thereby, the opening of each recessed part 84 of the 1st flow path member 17 is sealed by each convex part 85 of the 3rd flow path member 19, and the four horizontal flow paths 86 are formed. The third flow path member 19 is also bonded to the second flow path member 21 with an adhesive.

  The third flow path member 19 is provided with four communication paths 27 penetrating in the thickness direction. Each communication path 27 opens to one end of each convex portion 85 and communicates with the second ink supply path 29 of the second flow path member 21 via the filter 20. That is, the horizontal flow path 86 communicates with the first ink supply path 24 and the second ink supply path 29. The filter 20 captures feelings and foreign matters mixed in the ink in the first ink supply path 24.

  As shown in FIG. 6, a seal member 18 is sandwiched between the first flow path member 17 and the second flow path member 21. The seal member 18 is an elastic member made of resin or the like having an inner diameter larger than the outer diameter of the third flow path member 19 and formed in an annular shape.

  In the present embodiment, the seal member 18 has a concave cross section, and the joint portion 17a of the first flow path member 17 is in contact with the joint surface 82 that is the bottom surface of the concave shape. Further, the joint surface 83 opposite to the joint surface 82 of the seal member 18 is in contact with the second flow path member 21.

  Although not particularly illustrated, the second flow path member 21 is provided with a boss protruding toward the first flow path member 17, and is caulked in a state where the boss is inserted into a through hole provided in the first flow path member 17. As a result, the first flow path member 17 and the second flow path member 21 are fixed in a state where the seal member 18 is sandwiched.

  As described above, the seal member 18 is sandwiched between the first flow path member 17 and the second flow path member 21, whereby the air chamber 100 is defined by these members. Further, although not shown in particular, it communicates with the outside through a communication passage provided in the seal member 18 or the like. The second flow path member 21 and the third flow path member 19 are provided with a third atmospheric communication hole 103 and a second atmospheric communication hole 101, which are through holes, respectively. The third atmospheric communication hole 103 and the second atmospheric communication hole 101 communicate with each other and communicate with the air chamber 100 described above.

  As shown in FIGS. 2 and 4, the circuit board 13 has an electrical component such as an IC or a resistor mounted on the surface thereof. The circuit board 13 is disposed between the second flow path member 21 and the head body 14.

  The circuit board 13 is joined with a flexible cable 33 constituting the vibrator unit 45 of the head body 14. The circuit board 13 is provided with a connector 32 to which a signal cable (not shown) is connected. The signal cable is connected to the control unit of the ink jet recording apparatus 1. The circuit board 13 receives a drive signal or the like sent from the control unit through the signal cable, and drives the vibrator unit 45 through the flexible cable 33.

  The circuit board 13 is formed with a flow passage insertion hole 34 penetrating in the thickness direction in a region corresponding to the second ink supply passage 29. The lower end of the second ink supply path 29 is inserted into the flow path insertion hole 34, and the lower end of the second ink supply path 29 is below the circuit board 13 and the first flow path 71 of the head case body 47 (see FIG. 7). ).

  A head main body 14 is provided on the opposite side of the circuit board 13 from the second flow path member 21. As will be described in detail later, the head body 14 includes a head case 41, a flow path unit 39, and a vibrator unit 45 that is an example of a pressure generating unit. The head case 41 includes a head case main body 47 and a reinforcing member 48.

  The head case main body 47 is made of, for example, a resin such as epoxy resin, and extends from the case portion 47a to the side at the upper end of the case portion 47a (see FIG. 2) having a hollow box shape. Plate-shaped portion 47b (see FIG. 2). A projecting portion 75 that is positioned with respect to the reinforcing member 48 protrudes downward from the lower surface of the case portion 47a (see FIG. 2). Further, the flow path unit 39 is joined to the reinforcing member 48 on the surface opposite to the head case main body 47.

  A head cover 15 is attached to the head body 14. The head cover 15 is a metal member that is connected to the head case main body 47 and protects the flow path unit 39 and the head case 41. The head cover 15 is made of a thin plate member, surrounds the side surface of the head case 41, and has a lower end bent substantially 90 degrees toward the nozzle plate 49 and is in contact with the surface of the nozzle plate 49. The surface of the head cover 15 that contacts the surface of the nozzle plate 49 is formed in a frame shape so as to expose the nozzles (not shown). Further, a flange portion 80 projecting sideways is provided at the upper end of the head cover 15, and a head cover reference hole 81 is formed in the flange portion 80. A head cover positioning portion 76 projecting from the lower surface side of the head case main body 47 is inserted into the head cover reference hole 81 to position the head cover 15.

  Here, the head main body 14 will be described in detail with reference to FIG. FIG. 7 is a cross-sectional view of the main part of the head body. The flow path unit 39 constituting the head body 14 includes a nozzle plate 49, a flow path forming substrate 50, and a vibration plate 51.

  In the flow path forming substrate 50, a plurality of pressure generating chambers 38 are partitioned by a partition wall and arranged in parallel in the width direction. For example, in this embodiment, two rows in which the plurality of pressure generation chambers 38 are arranged in parallel are provided on the flow path forming substrate 50 (not shown).

  A manifold 52 that stores ink supplied to each pressure generating chamber 38 is provided outside the row of each pressure generating chamber 38 so as to penetrate the flow path forming substrate 50 in the thickness direction. Each pressure generating chamber 38 and the manifold 52 communicate with each other via an ink supply path 53 that is an individual flow path.

  In this embodiment, the flow path forming substrate 50 is made of a silicon single crystal substrate, and the pressure generation chamber 38 and the like provided in the flow path forming substrate 50 are formed by etching the flow path forming substrate 50. Yes.

  A nozzle plate 49 on which nozzles 36 are formed is joined to one side of the flow path forming substrate 50. The end of the pressure generating chamber 38 opposite to the manifold 52 communicates with the nozzle 36.

  A vibration plate 51 is bonded to the other surface side of the flow path forming substrate 50, that is, the opening surface side of the pressure generation chamber 38, and each pressure generation chamber 38 is sealed by the vibration plate 51.

  The vibration plate 51 is formed of a composite plate of an elastic film 55 and a support plate 54 that supports the elastic film 55, and the elastic film 55 side is bonded to the flow path forming substrate 50. The elastic film 55 is formed from an elastic member such as a resin film, for example. The support plate 54 is made of, for example, a metal material.

  In addition, in the region of the vibration plate 51 facing each pressure generating chamber 38, an island portion 60 with which the tip portion of the piezoelectric element 43 abuts is provided. That is, a thin portion 58 having a thickness smaller than that of the other regions is formed in a region facing the peripheral edge of each pressure generating chamber 38 of the diaphragm 51, and island portions 60 are respectively provided inside the thin portion 58. Yes.

  A head case body 47 is joined to the diaphragm 51. Specifically, a reinforcing member 48 fixed to the lower surface of the case portion 47 a of the head case main body 47 with an adhesive is joined on the diaphragm 51. Inside the case portion 47 a, an accommodation space 46 is formed that communicates with the insertion hole 40 of the reinforcing member 48, and a part of the vibrator unit 45, which is an example of pressure generating means, is accommodated in the accommodation space 46. Has been.

  The vibrator unit 45 includes a fixed plate 42, a piezoelectric element 43 fixed to the fixed plate 42, and a flexible cable 33 joined to the piezoelectric element 43. In the present embodiment, the piezoelectric element 43 is formed by laminating the piezoelectric material 61 and the electrode forming materials 62 and 63 alternately sandwiched vertically. The inactive region that does not contribute to the vibration of the piezoelectric element 43 is fixed to the fixing plate 42, and the tip portion that contributes to the vibration of the piezoelectric element 43 is fixed in contact with the vibration plate 51.

  In the region facing the manifold 52 of the vibration plate 51, similarly to the thin portion 58, a compliance portion 59 that is substantially composed only of the elastic film 55 is provided by removing the support plate 54 by etching. The elastic film 55 of the compliance portion 59 is formed of a resin material such as a PPS (polyphenylene sulfide) film having a thickness of about several μm, for example. The ink does not pass through the elastic film 55 of the compliance portion 59, but the water vapor evaporated from the water passes through the ink.

  A compliance space 56 that allows deformation of the compliance portion 59 is formed in a portion of the reinforcing member 48 that faces the compliance portion 59. The compliance space 56 is opened to the outside as follows.

  The head case main body 47 and the reinforcing member 48 are formed with first air communication holes 73 penetrating in the thickness direction. The first atmosphere communication hole 73 communicates with the compliance space 56 via a communication passage 48 b formed on the vibration member 51 side of the reinforcing member 48. Further, the first atmosphere communication hole 73 communicates with the second atmosphere communication hole 101 (see FIG. 4). On the other hand, as described above, the second atmospheric communication hole 101 communicates with the outside through the third atmospheric communication hole 103 and the air chamber 100.

  In other words, the compliance space 56 communicates with the air chamber 100 through the communication passage 48 b and the first atmospheric communication hole 73, and further through the second atmospheric communication hole 101 and the third atmospheric communication hole 103, and passes through the air chamber 100. It is open to the atmosphere. As a result, the compliance portion 59 is favorably deformed as the pressure of the manifold 52 changes.

  The reinforcing member 48 is formed with a first flow path 71 penetrating in the thickness direction. The head case main body 47 is formed with a second flow path 72 penetrating in the thickness direction. The first flow path 71 has one opening communicating with the manifold 52 and the other opening communicating with the second flow path 72. The second flow path 72 has one opening communicating with the first flow path 71 and the other opening communicating with the second ink supply path 29 (see FIGS. 2 and 6).

  The first flow path 71 and the second flow path 72, the first ink supply path 24, the horizontal flow path 86, and the second ink supply path 29 (see FIGS. 2 to 4) communicate with each other to form a liquid flow path. Is formed. Ink from the ink cartridge is supplied to the liquid channel, and the ink is supplied to the manifold 52 through the liquid channel.

  Here, a joint portion between the reinforcing member 48 and the diaphragm 51 will be described in detail with reference to FIGS. 8 and 9. FIG. 8 is a plan view of a surface of the reinforcing member 48 to be joined to the diaphragm 51 and a cross-sectional view taken along the line AA of FIG. 9, and FIG. 9 is an enlarged cross-sectional view of the main part of the head main body 14.

  In the present embodiment, the first member in the claims is the reinforcing member 48, and the second member is the diaphragm 51. The first through hole provided in the first member is the first flow path 71, and the second through hole provided in the second member is provided in the vibration plate 51 (the support plate 54 and the elastic film 55). This is a communication hole 78.

  As illustrated, the reinforcing member 48 is formed with two insertion holes 40 along the longitudinal direction. Four first flow paths 71 are arranged between the insertion holes 40. One first air communication hole 73 is also disposed between these insertion holes 40.

  Although not particularly illustrated, the head case main body 47 is also provided with two accommodation cavities 46 facing the insertion holes 40, and the second flow path 72 and the first atmosphere communication are provided between the accommodation cavities 46. A hole 73 is provided.

  In the present embodiment, four first flow paths 71 (second flow paths 72) are provided corresponding to the four colors of ink, respectively. The flow path unit 39 is also provided with four manifolds 52, and each first flow path 71 communicates with each manifold 52. In addition, the compliance space 56 provided in each manifold 52 communicates with one first air communication hole 73 in common.

  On the surface of the reinforcing member 48 on the vibration plate 51 side, the first protrusion 91 that surrounds the periphery of the first flow path 71 and protrudes toward the vibration plate 51, and the vibration plate 51 that surrounds the outside of the first protrusion 91. A second protrusion 92 protruding to the side is formed. In the present embodiment, the first protrusion 91 is formed so as to surround the first flow path 71 in an annular shape, and the second protrusion 92 further surrounds the periphery of the first protrusion 91 in an annular shape. Is formed. The first flow path 71, the first protrusion 91, and the second protrusion 92 are concentric. A groove 93 is formed between the first protrusion 91 and the second protrusion.

The first protrusion 91 has an adhesive surface 91 a that is bonded to the diaphragm 51, and the second protrusion 92 has an adhesive surface 92 a that is bonded to the diaphragm 51. Further, the gap G1 between the adhesive surface 91a and the surface of the diaphragm 51 is formed to be equal to the gap G2 between the adhesive surface 92a and the surface of the diaphragm 51. In order to make the gaps G1 and G2 uniform, in this embodiment, the heights H ₁ and H ₂ of the first protrusion 91 and the second protrusion 92 from the surface of the reinforcing member 48 are the same. The surface of the diaphragm 51 is flush. Furthermore, the width _{W 1} of the adhesive surface 91a of the first projection 91, the width _{W 2} of the bonding surface 92a of the second projections 92 are formed to be the same.

  The reinforcing member 48 on which the first protrusion 91 and the second protrusion 92 are formed is joined to the diaphragm 51 with an adhesive 77. Specifically, the first flow path 71 and the communication hole 78 communicate with each other, and the adhesive surface 91 a of the first protrusion 91 and the adhesive surface 92 a of the second protrusion 92 are joined to the diaphragm 51 with an adhesive 77. .

  In such joining of the reinforcing member 48 and the diaphragm 51, the adhesive 77 is attached to the groove portion 93 of the reinforcing member 48. For example, the amount of the adhesive 77 is such that the inside of the groove 93 is filled and rises from the adhesive surface 91a and the adhesive surface 92a. Then, the reinforcing member 48 to which such an adhesive 77 is attached is joined to the diaphragm 51. As a result, the adhesive 77 spreads around the groove 93 toward the first protrusion 91 and the second protrusion 92, and between the adhesive surface 91a and the diaphragm 51 and between the adhesive surface 92a and the diaphragm 51. To penetrate and glue them together.

At this time, as described above, the gaps G1 and G2 between the diaphragm 51 and the bonding surface 91a and the bonding surface 92a are made uniform, so that the adhesive 77 is centered on the groove 93 and the first protrusion 91 side and the second protrusion 92 The amount spreading to the side is also equal. That is, the adhesive 77 adheres evenly to the adhesive surface 91a and the adhesive surface 92a. The adhesive 77 adheres evenly means that the thickness of the adhesive 77 between the adhesive surface 91a and the adhesive surface 92a and the diaphragm 51 is equal, and the width of the adhesive 77 attached to the adhesive surface 91a and the adhesive surface 92a. Means the same width. Furthermore, in the present embodiment, since the uniform width W ₁ and the width W ₂ of the first projection 91 and second projection 92, the width of the adhesive 77 covering the adhesive surface 91a and the adhesive surface 92a is also the same .

  By forming the first protrusion 91 and the second protrusion 92 as described above, it is possible to manage how much the adhesive 77 is adhered between the adhesive surface 91a and the adhesive surface 92a and the diaphragm 51. It becomes possible. That is, if the amount of the adhesive 77 provided in the groove 93 is appropriately determined, the adhesive 77 can be evenly adhered between the adhesive surface 91 a and the adhesive surface 92 a and the diaphragm 51.

  Assume that the gap G1 is wider than G2. In this case, a large amount of the adhesive 77 adheres to the first protrusion 91, and the adhesive 77 does not much adhere to the second protrusion 92 side. That is, the adhesive 77 does not evenly adhere to the adhesive surface 91a and the adhesive surface 92a. If the adhesive 77 does not adhere evenly in this way, the adhesive 77 that protrudes into the first flow path 71 becomes excessive, obstructing the flow of ink, or bubbles in the ink adhere to the protruding adhesive 77. There is a risk of reducing the discharge of bubbles. Conversely, the adhesive 77 between the first protrusion 91 and the diaphragm 51 may be insufficient (the adhesive 77 is pulled). In this case, bubbles of ink accumulate in a portion where the adhesive 77 generated between the first protrusion 91 and the vibration plate 51 is absent, or ink penetrates from the portion and reaches the circuit board 13 or the like. There is a fear.

  However, in the recording head 2 according to the present embodiment, since the spread of the adhesive 77 between the first protrusion 91 and the second protrusion 92 and the diaphragm 51 can be managed, the adhesive on the first protrusion 91 side. It is possible to prevent excessive 77 from protruding into the first flow path 71 or causing the adhesive 77 to be pulled between the bonding surface 91 a and the diaphragm 51.

  Specifically, the adhesive 77 reaches the first flow path 71 beyond the bonding surface 91a of the first protrusion 91, and extends outside the second protrusion 92 beyond the bonding surface 92a of the second protrusion 92. Has reached. This prevents air bubbles from remaining in the portion where the adhesive 77 has been drawn, or the ink from reaching the circuit board 13 or the like through the interface between the adhesive 77, the vibration plate 51 and the reinforcing member 48 from the drawn portion. Yes. As a result, the recording head 2 is provided which has improved bubble discharge and improved reliability.

  In the present embodiment, the opening 71 a of the first flow path 71 is formed larger than the opening 78 a of the communication hole 78. That is, the opening on the upstream side of the liquid channel is formed larger than the opening on the downstream side. By forming the opening shape in this way, the opening 78a is positioned inside the opening 71a. The peripheral surface of the opening 78a of the diaphragm 51 is exposed. Let the exposed surface of this diaphragm 51 be the exposed part 51a. The exposed portion 51 a is a region outside the opening 78 a and is a region closer to the opening 78 a than the bonding surface 91 a of the reinforcing member 48.

  The adhesive 77 is adhered to the exposed portion 51a. That is, the adhesive 77 adheres to the exposed portion 51 a and does not adhere to the first flow path 71.

  By providing the exposed portion 51 a in this way, only the upstream side of the first flow path 71 of the adhesive 77 protruding into the first flow path 71 comes into contact with the ink. That is, the adhesive 77 has the exposed portion 51 a on the downstream side of the first flow path 71, so that the ink does not contact the downstream surface of the adhesive 77.

  As shown in FIG. 10, when the opening 71 a of the first flow path 71 and the opening 78 a of the communication hole 78 have the same opening shape, the adhesive 77 that protrudes into the first flow path 71 is removed from the first flow path 71. The ink also contacts the downstream side. In this case, in the region R on the downstream side of the adhesive 77, the ink flow rate decreases. For this reason, in the region R, bubbles contained in the ink remain without being discharged downstream. Furthermore, if the first flow path 71 is along the vertical direction as in this embodiment, even if the bubbles try to move upstream due to buoyancy, the bubbles are restricted by the adhesive 77, and the bubbles remain more in the region R. It has become easier.

  However, in the configuration shown in FIG. 9, it is possible to prevent bubbles from remaining on the downstream side of the adhesive 77 by forming the exposed portion 51 a. Accordingly, since the bubble discharge performance is improved, it is possible to prevent the bubbles from moving to the nozzle side during printing and causing an ink discharge failure. Thus, the recording head 2 with improved discharge quality is provided.

  In addition, as shown in FIG. 10, the case where the opening 71a of the 1st flow path 71 and the opening 78a of the communicating hole 78 are made into the same opening shape is also included in this invention. Since the present invention can manage the amount of the adhesive 77 protruding as described above, even if the adhesive 77 protrudes into the first flow path 71, the amount of protrusion is such that the residual bubbles are negligible. Because it is possible to do.

  Further, as shown in FIG. 8, the adhesive 77 protruding from the adhesive surface 92 a of the second protrusion 92 can reach the insertion hole 40 through which the vibrator unit 45 is inserted. However, even if the adhesive 77 flows into the insertion hole 40, there is no problem that causes bubbles in the ink to remain. Therefore, it is possible to reduce the distance between the insertion hole 40 and the second protrusion 92 as much as possible. Thereby, in the recording head 2 having the plurality of transducer units 45, it is possible to save the space in terms of the size in plan view.

  In the recording head 2 described above, when ejecting ink droplets, the volume of each pressure generating chamber 38 is changed by deformation of the vibrator unit 45 and the diaphragm 51 so that ink droplets are ejected from a predetermined nozzle 36. It has become.

  Specifically, the piezoelectric element 43 is contracted by applying a voltage to the piezoelectric element 43 of the vibrator unit 45. As a result, the diaphragm 51 is deformed together with the piezoelectric element 43 to expand the volume of the pressure generating chamber 38, and ink is drawn into the pressure generating chamber 38 from the manifold 52. Then, after the ink is filled up to the nozzle 36, the voltage applied to the piezoelectric element 43 is released according to the recording signal transmitted from the circuit board 13 via the flexible cable 33. As a result, the piezoelectric element 43 is expanded to return to the original state, and the diaphragm 51 is also displaced to return to the original state. As a result, the volume of the pressure generation chamber 38 contracts, the pressure in the pressure generation chamber 38 increases, and ink droplets are ejected from the nozzle 36.

<Other embodiments>
As mentioned above, although one Embodiment of this invention was described, the basic composition of this invention is not limited to what was mentioned above.

  FIG. 11 is an enlarged cross-sectional view of a main part of the head main body 14 according to the embodiment. In addition, the same code | symbol is attached | subjected to the same thing as Embodiment 1, and the overlapping description is abbreviate | omitted.

  As shown in the figure, the first protrusion 91 and the second protrusion 92 have different heights H1 and H2 from the surface of the reinforcing member 48. On the other hand, the diaphragm 51 includes a flat portion 54 a that faces the first protrusion 91, and a flat portion 54 b that protrudes closer to the reinforcing member 48 than the flat portion 54 a and faces the second protrusion 92. The gap G1 between the flat portion 54a and the bonding surface 91a is formed to be the same as the gap G2 between the flat portion 54b and the bonding surface 92a.

  Thus, even when the first protrusion 91 and the second protrusion 92 are not the same height, and the surface of the diaphragm 51 is not flush, the above-described gaps G1 and G2 are the same. By forming them in the same manner as in the first embodiment, it is possible to manage the adhesive 77 adhered to the groove portion 93.

  In the first embodiment, the reinforcing member 48 is exemplified as the first member of the claims and the diaphragm 51 is exemplified as the second member. However, the present invention is not limited to such a member. By reversing these, the first member may be the diaphragm 51 and the second member may be the reinforcing member 48. In addition, the head case main body 47 as the first member, the second flow path member as the second member, the through hole of the first member is the second flow path of the head case main body 47, and the through hole of the second member is the second flow. The second ink supply path 29 of the path member may be used. In any case, any member constituting the liquid channel can be used as the first member and the second member.

  Further, as the pressure generating means, for example, a thin film type piezoelectric element in which a lower electrode, a piezoelectric layer made of a piezoelectric material, and an upper electrode are formed by a film forming and lithography method may be used, or a green sheet is attached. A thick film type piezoelectric element formed by such a method can also be used. Also, as a pressure generating means, a heating element is arranged in the pressure generating chamber, and droplets are discharged from the nozzle opening by bubbles generated by the heat generated by the heating element, or static electricity is generated between the diaphragm and the electrode. In addition, it is possible to use a device in which a diaphragm is deformed by electrostatic force and droplets are ejected from a nozzle opening.

  In the ink jet recording apparatus 1 described above, the recording head 2 is mounted on the carriage 4 and moves in the main scanning direction. However, the present invention is not limited to this. For example, the recording head 2 is fixed, paper or the like The present invention can also be applied to a so-called line type recording apparatus that performs printing only by moving the recording sheet 6 in the sub-scanning direction.

  In each of the above embodiments, an ink jet recording head has been described as an example of a liquid ejecting head, and an ink jet recording apparatus has been described as an example of a liquid ejecting apparatus. The present invention is intended for the entire apparatus, and can of course be applied to a liquid ejecting head and a liquid ejecting apparatus that eject liquid other than ink. Other liquid ejecting heads include, for example, various recording heads used in image recording apparatuses such as printers, color material ejecting heads used in the manufacture of color filters such as liquid crystal displays, organic EL displays, and FEDs (field emission displays). Examples thereof include an electrode material ejection head used for electrode formation, a bio-organic matter ejection head used for biochip production, and the like, and can also be applied to a liquid ejection apparatus provided with such a liquid ejection head.

  DESCRIPTION OF SYMBOLS 1 Inkjet recording device (liquid ejecting apparatus), 2 Inkjet recording head (liquid ejecting head), 12 Flow path member, 14 Head main body, 36 Nozzle, 40 Insertion hole, 41 Head case, 45 Vibrator unit, 48 Reinforcement member 48b communication path, 49 nozzle plate, 51 diaphragm, 51a exposed part, 54 support plate, 55 elastic membrane, 71 first flow path, 72 second flow path, 77 adhesive, 78 communication hole, 91 first protrusion 91a bonding surface, 92 second protrusion, 92a bonding surface, 93 groove

Claims (9)

A head body that discharges liquid from a nozzle;
A liquid flow path the liquid flows supplied previously Kihe head body,
A through hole that constitutes a part of the liquid channel is provided, and includes a first member and a second member that are joined with an adhesive so that the through hole communicates,
On the surface of the first member, there are a first protrusion that protrudes toward the second member around the periphery of the through hole, and a first protrusion that protrudes toward the second member around the outside of the first protrusion. Two protrusions and a groove between the first protrusion and the second protrusion are formed,
The first protrusion and the second protrusion have an adhesive surface bonded to the second member side via the adhesive, and the distance between the adhesive surface and the second member side is equal. Formed to be
Before SL adhesives, it said has spread to the first projection side and the second projection side around the groove, and, together with the reach the through-hole beyond the adhesive surface of the first projection, wherein The liquid ejecting head, wherein the liquid ejecting head extends beyond the bonding surface of the second protrusion to the outside of the second protrusion. The liquid ejecting head according to claim 1,
Of the through holes of the first member and the second member, the one far from the nozzle is the first through hole, and the one close to the nozzle is the second through hole,
The liquid ejecting head, wherein an opening shape of the first through hole on the second member side is formed larger than an opening shape of the second through hole on the first member side. The liquid ejecting head according to claim 1 or 2,
The first protrusion and the second protrusion are formed such that the height from the surface on the second member side of the first member to the adhesive surface is the same, and the adhesive surface of the second member The liquid jet head is characterized in that a region facing the surface is formed flush with the surface. In the liquid jet head according to any one of claims 1 to 3,
The liquid ejecting head, wherein the first projecting portion and the second projecting portion are formed to have the same width of the bonding surface. In the liquid jet head according to any one of claims 1 to 4,
The head body includes a pressure generation chamber communicating with a nozzle for discharging liquid, a plurality of pressure generation means for deforming the pressure generation chamber, and a head case to which the pressure generation means is fixed,
In the head case,
An insertion hole through which each pressure generating means is inserted is provided,
The liquid ejecting head, wherein the through hole, the first protrusion, and the second protrusion are provided so as to be positioned between the insertion holes. A method for manufacturing a liquid jet head, comprising:
The liquid jet head includes:
A head body that discharges liquid from a nozzle;
A liquid channel through which the liquid supplied to the head body flows;
A through hole constituting a part of the liquid flow path is provided, and a first member and a second member joined with an adhesive so that the through hole communicates,
On the surface of the first member, there are a first protrusion that protrudes toward the second member around the periphery of the through hole, and a first protrusion that protrudes toward the second member around the outside of the first protrusion. Two protrusions and a groove between the first protrusion and the second protrusion are formed,
The first protrusion and the second protrusion have an adhesive surface bonded to the second member side via the adhesive, and the distance between the adhesive surface and the second member side is equal. Formed to be
Attaching the adhesive to the groove so that the adhesive rises from the adhesive surface of the first protrusion and the second protrusion; and
The adhesive attached to the groove part reaches the through hole beyond the adhesive surface of the first protrusion, and reaches the outside of the second protrusion beyond the adhesive surface of the second protrusion. a method of manufacturing a liquid jet head, characterized in that and a step of joining the first member and the second member. In the manufacturing method of the liquid jet head according to claim 6,
Of the through holes of the first member and the second member, the one far from the nozzle is the first through hole, and the one close to the nozzle is the second through hole,
The opening shape of the first through hole on the second member side is formed larger than the opening shape of the second through hole on the first member side.
A method of manufacturing a liquid ejecting head. In the manufacturing method of the liquid jet head according to claim 6 or 7,
The first protrusion and the second protrusion are formed such that the height from the surface on the second member side of the first member to the adhesive surface is the same, and the adhesive surface of the second member The area opposite to is formed flush
A method of manufacturing a liquid ejecting head. In the manufacturing method of the liquid jet head according to any one of claims 6 to 8,
The first protrusion and the second protrusion are formed to have the same width of the bonding surface.
A method of manufacturing a liquid ejecting head.

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