JP2012187731A - Liquid ejecting head and liquid ejecting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid ejecting head which has a structure for preventing liquid leaked at an upper stream side of the liquid ejecting head from intruding into an internal space formed by a plurality of members from a clearance of a boundary part combined by the plurality of members.SOLUTION: The liquid ejecting head includes: a head body; a case member; a flow passage member; and a circuit substrate. An upper end surface 64 of a wall surface part 63 of the case member and a lower end surface 65 of the wall surface part 88 of the cover member are mutually oppose to. The lower end surface 65 is projected downward at the outer peripheral side, and has a convex part 67 relatively opposed to through a gap G between the upper end surface 64. The upper end surface 64 is projected upward at an inner peripheral surface side rather than the inner peripheral surface of the wall surface part 88, and has the convex part 66 in which a tip end surface 66A is positioned at the upper side rather than the tip end surface 67A of the convex part 67 at the outer peripheral side, and also has a space 68 which becomes a liquid accumulation part in communication with the gap G between the convex part 67 at the outer peripheral side and the convex part 66 at the inner peripheral side. Meniscus of ink is formed between the end part at the outer peripheral side on the tip end surface 66A of the convex part 66 and the lower end surface 65.

Description

  The present invention relates to a liquid ejecting head and a liquid ejecting apparatus, and is particularly useful when applied to a liquid ejecting head that ejects liquid supplied from a liquid storage unit to a head body via a liquid supply path from a nozzle.

  An ink jet recording head (hereinafter also referred to as “recording head”), which is a typical example of a liquid ejecting head, generally has an ink flow path (liquid flow path) from an ink cartridge (liquid storage means) filled with ink. Ink is supplied to the pressure generating chamber of the head main body. An ink droplet is ejected from a nozzle communicating with the pressure generating chamber by applying pressure to the pressure generating chamber by a pressure generating means such as a piezoelectric element.

  A specific configuration of the recording head includes, for example, a head main body, a head case to which a plurality of head main bodies are fixed, and a cartridge case to which the head case is fixed, and between the head case and the cartridge case. In some cases, a circuit board that supplies a signal for driving a piezoelectric element is housed and fixed (see, for example, Patent Document 1). Here, the circuit board is usually provided with a connector, and external wiring is connected through the connector.

JP 2003-11383 A

  As described above, in the recording head that includes the head case and the cartridge case, and the circuit board is housed and fixed between the head case and the cartridge case, the ink leaked for some reason is transmitted to the surface of the cartridge case. There is a concern about a situation in which it enters the inside through the gap between the case and the cartridge case and goes around the circuit board.

  For this reason, conventionally, for example, measures have been taken such as making the gap between the head case and the cartridge case as small as possible and applying a filler to necessary portions.

  However, an ink jet recording apparatus having the recording head (hereinafter also referred to as “recording apparatus”) may require disassembly during reassembly or reuse within the manufacturing process. At the time of such decomposition, if the filler as described above is applied, it is difficult to perform predetermined decomposition, and man-hours are required for peeling and cleaning the filler after decomposition. As a result, if fillers are used, costs (auxiliary costs, labor costs) will increase.

  In addition, the connector has a connection port to which external wiring is connected that opens toward the outside. Therefore, there is a possibility that ink may enter even through the connection port.

  Such a problem exists not only in an ink jet recording head but also in a liquid ejecting head that ejects liquid other than ink.

  In the present invention, in view of the problems of the prior art as described above, the liquid leaked on the upstream side of the liquid ejecting head enters the internal space formed by the member from the gap at the boundary portion where a plurality of members are combined. It is an object of the present invention to provide a liquid ejecting head and a liquid ejecting apparatus that can be suppressed.

An aspect of the present invention that solves the above problems is housed in a head body that ejects liquid droplets, a case member to which the head body is fixed, and a cover member that is a box-shaped member that opens on the case member side. And a flow path member that is fixed to the case member with a liquid supply path through which liquid flows, and a pressure generating element of the head body that is housed and fixed in an internal space formed by the case member and the flow path member A liquid ejecting head having a circuit board connected to the upper end surface of the wall surface of the case member extending toward the flow path member and surrounding the liquid supply path and extending toward the case member. The lower end surface of the wall surface portion of the cover member is configured to face each other, and the lower end surface protrudes toward the case member on the outer peripheral side and has a gap between the upper end surface. While having the convex part which opposes, the said upper end surface protrudes in the said cover member side by the inner peripheral surface side rather than the inner peripheral surface of the wall surface part of the said cover member, and from the front end surface of the convex part of the said outer peripheral side The liquid ejecting head according to claim 1, further comprising a convex portion having a front end surface located on the cover member side.
According to this aspect, the leaked liquid that has fallen along the wall surface portion tries to enter the internal space formed by the flow path member and the case member through the gap at the boundary between the upper and lower wall surface portions. Since the entrance of the space is narrowed by forming, intrusion can be suppressed at this portion. On the other hand, the liquid that has entered through the gap attempts to flow over the tip surface and flow into the inner peripheral surface side of the wall surface portion, but a liquid meniscus is formed between the tip surface and the lower end surface. The meniscus prevents the liquid from flowing into the inner peripheral surface.
As a result, it is possible to satisfactorily suppress the leakage liquid from entering the internal space formed by the flow path member and the case member.

  Here, it is desirable that a space serving as a liquid storage portion communicated with the gap is formed between the convex portion on the outer peripheral side and the convex portion on the inner peripheral side. In this case, the space functions as a storage portion for the liquid that has entered the space, whereby a predetermined intrusion liquid corresponding to the volume of the space can be stored. Further, it is desirable that a liquid meniscus is formed between the outer peripheral end of the tip end surface and the lower end surface of the convex portion on the inner peripheral side. This ensures that a liquid meniscus is formed between the outer peripheral end of the tip surface and the lower end surface, and reliably prevents the liquid from entering beyond the tip surface of the convex portion. can do.

  Furthermore, it is preferable that the upper surface portion of the cover member has a plurality of grooves for guiding the leaked liquid to the wall surface portion. Thereby, when the liquid leaked by the liquid leak adheres to the upper surface of the cover member, the leaked liquid is guided to the wall portion by being guided by the relatively low groove. As a result, the leaked liquid guided to the wall surface part is transmitted by its own weight through the surface of the wall surface part, and reaches the position where the lower end surface of the wall surface part of the cover member and the upper end surface of the wall surface part of the case member face each other. Is captured in this part as well.

  Further, an exposed opening for exposing the connection port of the connector is formed in the cover member in a region facing the connector disposed on the circuit board and connected to the external wiring, and the leaked liquid is guided to the wall surface. Desirably, a groove is formed around the exposed opening. In this case, not only the leaked liquid adhering to the upper surface of the cover member but also the leaked liquid adhering to the periphery of the connection port of the connector are similarly detected on the lower end surface of the wall surface of the cover member and the wall surface of the case member. It can be captured at a position facing the end face. As a result, it is possible to prevent the leaked liquid from entering the connector through the exposed opening and the connection port.

  According to another aspect of the invention, there is provided a liquid ejecting apparatus including the liquid ejecting head as described above. In this aspect, the durability of the head can be improved, and a liquid ejecting apparatus with improved reliability can be realized.

1 is an exploded perspective view showing an overall configuration of a recording head according to an embodiment of the present invention. FIG. 2 is an assembled cross-sectional view of a recording head according to an embodiment of the invention. 1 is a schematic perspective view of a recording head according to an embodiment of the present invention excluding a head body. It is a disassembled perspective view of the head main body in one Embodiment of this invention. It is sectional drawing of the head main body in one Embodiment of this invention. It is sectional drawing which extracts and expands the A section of FIG. 1 is a schematic configuration diagram illustrating a recording apparatus according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 is an exploded perspective view of an ink jet recording head which is an example of a liquid jet head according to an embodiment of the present invention, FIG. 2 is an assembled sectional view thereof, and FIG. 3 is a perspective view thereof.

  As shown in FIGS. 1 to 3, the recording head 10 includes a plurality of head main bodies 20 that eject ink droplets, a case member 60 to which the head main bodies 20 are fixed, and a surface of the case member 60 opposite to the head main body 20. It has a flow path member 80 provided on the side, a circuit board 90 provided between the case member 60 and the flow path member 80, and a connector 92 to which external wiring (not shown) is connected. Thus, the flow path member 80 through which the ink supplied to the head main body 20 circulates and the case member 60 store and fix the circuit board 90 in the internal space via the seal member 95 (detailed configuration of this portion) Will be described in detail later).

  Here, an example of the configuration of the head main body 20 will be described with reference to FIGS. 4 and 5. FIG. 4 is an exploded perspective view of the head main body in one embodiment, and FIG. 5 is a cross-sectional view in the longitudinal direction of the pressure generating chamber of the head main body.

  As shown in FIGS. 4 and 5, the flow path forming substrate 21 constituting the head body 20 is provided with two rows in which a plurality of pressure generating chambers 22 are arranged in the width direction. In addition, a communication portion 23 is formed in a region outside the longitudinal direction of the pressure generation chambers 22 in each row, and the communication portion 23 and each pressure generation chamber 22 are provided with an ink supply path 24 provided for each pressure generation chamber 22 and It communicates via the communication path 25.

  One surface of the flow path forming substrate 21 is joined to a nozzle plate 27 in which nozzles 26 communicating with the vicinity of the end of each pressure generating chamber 22 on the side opposite to the ink supply path 24 are formed.

  On the other hand, a piezoelectric element 30 is formed on the surface of the flow path forming substrate 21 opposite to the nozzle plate 27 via an elastic film 28 and an insulator film 29. The piezoelectric element 30 includes a first electrode 31, a piezoelectric layer 32, and a second electrode 33. A lead electrode 34 extending to the insulator film 29 is connected to the second electrode 33 constituting each piezoelectric element 30. One end of the lead electrode 34 is connected to the second electrode 33, and the other end is a flexible wiring member (COF substrate), and a driving wiring 35 on which a driving IC 35 a for driving the piezoelectric element 30 is mounted. Connected with. Thus, the lead electrode 34 is connected to one end side of the drive wiring 35, and the other end side of the drive wiring 35 is fixed to the circuit board 90 (see FIG. 2).

  On the flow path forming substrate 21 on which such a piezoelectric element 30 is formed, a protective substrate 37 provided with a piezoelectric element holding portion 36 which is a space for protecting the piezoelectric element 30 in a region facing the piezoelectric element 30. Are joined by an adhesive 38. The protective substrate 37 is provided with a manifold portion 39. In the present embodiment, the manifold portion 39 is connected to the communication portion 23 of the flow path forming substrate 21 to constitute a manifold 40 that serves as a common ink chamber for the pressure generating chambers 22.

  The protective substrate 37 is provided with a through hole 41 that penetrates the protective substrate 37 in the thickness direction. In the present embodiment, the through hole 41 is provided between the two piezoelectric element holding portions 36. The end portion of the lead electrode 34 drawn out from each piezoelectric element 30 faces the through hole 41.

  Further, a compliance substrate 46 including a sealing film 44 and a fixing plate 45 is bonded on the protective substrate 37. Here, the sealing film 44 is made of a material having low rigidity and flexibility, and one surface of the manifold portion 39 is sealed by the sealing film 44. The fixed plate 45 is made of a hard material such as metal. Since the region of the fixing plate 45 facing the manifold 40 is an opening 47 that is completely removed in the thickness direction, one surface of the manifold 40 is sealed only with a flexible sealing film 44. It has been stopped. Further, the compliance substrate 46 is provided with an ink introduction port 48 for introducing ink into the manifold 40.

  A head case 49 is fixed on the compliance substrate 46. The head case 49 is provided with an ink introduction path 50 that communicates with the ink introduction port 48 and supplies ink from a storage unit such as a cartridge to the manifold 40. Further, the head case 49 is provided with a wiring member holding hole 51 that communicates with the through hole 41 provided in the protective substrate 37, and the drive wiring 35 is inserted into the wiring member holding hole 51 and has one end thereof. The side is connected to the lead electrode 34.

  Each head body 20 having such a configuration is fixed to the case member 60. More specifically, as shown in FIGS. 1 and 2, a plurality of (four in the present embodiment) head bodies 20 are fixed to the bottom surface side of the case member 60. The case member 60 is provided with a through hole 61 penetrating the case member 60 in the thickness direction corresponding to each head body 20. A supply path 62 that communicates with the ink introduction path 50 provided in the head case 49 of the head body 20 is provided outside the through hole 61 of the case member 60. The drive wiring 35 of each head main body 20 is inserted into the through hole 61, and the head case 49 of each head main body 20 is placed on the peripheral portion of the through hole 61 with the ink introduction path 50 and the supply path 62 communicating with each other. It is joined.

  A cover head 70 having a window 71 through which the nozzle 26 is exposed is fixed to the surface of each head body 20 fixed to the case member 60 on the nozzle plate 27 side.

  The flow path member 80 is fixed to the surface of the case member 60 opposite to the head body 20 via a circuit board 90 and a seal member 95 made of a rubber material or the like.

  On the circuit board 90, electronic components and various wirings for driving the piezoelectric element 30 are mounted as described above. The circuit board 90 is provided with a connection hole 91 penetrating in the thickness direction. The drive wiring 35 of the head main body 20 is inserted into the connection hole 91, and the tip thereof is electrically connected to various wirings of the circuit board 90.

  The flow path member 80 includes a flow path member main body 81 and a cover member 82. The circuit board 90 and the seal member 95 described above are held between the flow path member main body 81 and the case member 60 constituting the flow path member 80.

  A flow path member main body 81 constituting one of the flow path members 80 is provided with a fixed portion 83 to which a plurality of ink supply needles 100 inserted into the ink cartridge are fixed on one surface side, and a lower surface of the fixed portion 83. It is comprised with the flow-path formation part 84 to be performed. The flow path forming portion 84 is formed with an ink supply hole 85 whose one end is opened facing the ink supply needle 100. The other end side of the ink supply hole 85 is connected to the supply path 62 of the case member 60 via a supply communication path 96 provided in the seal member 95.

  A filter 110 for removing bubbles and foreign matters in the ink is provided at the opening on one end side of the ink supply hole 85. That is, the ink supply needle 100 is fixed to the fixing portion 83 of the flow path member main body 81 through the filter 110.

  Each ink supply needle 100 includes a through passage 101 communicating with the ink supply hole 85 therein. When the ink supply needle 100 is inserted into an ink cartridge (not shown), the ink in the ink cartridge passes through the through path 101, the ink supply hole 85, the supply path 62, and the like of the head main body 20 through the ink supply needle 100. Are supplied to the manifold 40.

  The cover member 82 that constitutes the other side of the flow path member 80 is a box-shaped case member that opens on the lower surface side (the head main body 20 side), and is superimposed on the flow path member main body 81 from the ink supply needle 100 side. It is integrated with the flow path member main body 81. Specifically, the cover member 82 has a top surface 86 provided with an opening 87 through which the ink supply needle 100 is exposed, and a wall surface that surrounds the flow path forming portion 84 and reaches the case member 60. Part 88. The cover member 82 is overlapped on the flow path member main body 81 from the ink supply needle 100 side, and the cover member 82 and the case are sandwiched between the flow path member main body 81 and the case member 60 with the circuit board 90 and the seal member 95 interposed therebetween. The member 60 is fixed by a fastening member 120 such as a screw. Thereby, the flow path member main body 81 and the cover member 82 are integrated to form the flow path member 80, and the flow path member 80 and the case member 60 are integrated. In the present embodiment, the flow path member 80 and the case member 60 are fixed by four fastening members 120 provided on each side thereof.

  Thus, in the recording head 10 according to the present embodiment, the periphery of the circuit board 90 on which electronic components and the like for driving the piezoelectric element 30 are mounted is covered with the flow path member 80 and the case member 60. That is, the circuit board 90 is accommodated in a space formed between the cover member 82 and the case member 60. Thereby, it is possible to effectively suppress the ink mist generated when the ink droplets are ejected from the nozzles 26 of the head main body 20 from adhering to the circuit board 90. Here, the circuit board 90 is provided with a connector 92 to which external wiring (not shown) is connected. The connectors 92 are respectively disposed at opposite corners of the substantially rectangular circuit board 90, and a connection port 93 through which an external wiring is inserted and removed opens toward the flow path member 80 side. The cover member 82 constituting the flow path member 80 has an exposed opening 89 that exposes the connection port 93 of the connector 92 in a region facing the connector 92. Thus, external wiring can be inserted into and removed from the connection port 93 of the connector 92 through the exposed opening 89 from the outside of the flow path member 80.

  As described above, in this embodiment, the cover member 82 is overlapped on the flow path member main body 81 from the ink supply needle 100 side, and the circuit board 90 and the seal member 95 are sandwiched between the flow path member main body 81 and the case member 60. In this state, the cover member 82 and the case member 60 are fixed by a fastening member 120 such as a screw. Therefore, the circuit board 90 and the seal member 95 are pressed against the case member 60 by the cover member 82 via the flow path member main body 81.

  On the other hand, the upper end surface of the wall surface portion 63 of the case member 60 extending to the flow path member 80 side (upward) and the lower end surface 65 of the wall surface portion 88 of the cover member 82 extending to the case member 60 side (downward) are interposed via a gap. They are opposed to each other. The structure of this part will be described in more detail with reference to FIG. FIG. 6 is a cross-sectional view showing a portion A of FIG. 2 extracted and enlarged. As shown in the figure, the lower end surface 65 of the wall surface portion 88 has a convex portion 67 that protrudes downward on the outer peripheral side and opposes the upper end surface 64 with a gap therebetween. The dimension of the gap G that opens to the outside of the wall surface portions 88 and 63 is defined between the front end surface 67A and the upper end surface 64 of the convex portion 67. On the other hand, the upper end surface 64 of the wall surface portion 63 has a convex portion 66 protruding upward on the inner peripheral side thereof. Here, the convex portion 66 protrudes upward on the inner peripheral surface side of the wall surface portion 63 from the inner peripheral surface of the wall surface portion 88. That is, the point α (a point on the outermost surface side of the convex portion 66) is located closer to the inner peripheral surface side of the wall portion 63 than the point β (a point on the inner peripheral surface of the wall surface portion 88) in the figure. It is formed as follows. The convex portion 66 is formed such that the height from the upper end surface 64 to the tip end surface 66A is larger than the gap G. Thus, a space 68 serving as a liquid storage portion communicating with the gap G is formed between the convex portion 67 and the convex portion 66. The vertical position of the space 68 is defined by the lower end surface 65 and the upper end surface 64.

  Further, the dimension between the end on the outer peripheral side of the front end surface 66A of the convex portion 66 and the lower end surface 65, that is, the dimension between the point α and the point β is the dimension at which the ink meniscus M is formed. .

  In the present embodiment as described above, the ink that has leaked for some reason and has fallen along the wall surface portion 88 passes through the gap G at the boundary portion γ of the wall surface portions 88 and 63 and passes through the gap member G and the case member 60. Try to penetrate into the internal space that forms. In the present embodiment, since the gap G is formed and the entrance of the space 68 is narrowed, the intrusion can be suppressed at this portion. However, since the gap G communicates with the space 68, if the amount of leaked ink reaches a certain amount, it flows into the space 68 through the gap G. Here, since the space 68 is formed as a relatively wide space, it functions as an ink storage portion and stores a predetermined amount of leaked ink. When the storage amount gradually increases and reaches the position of the front end surface 66A of the convex portion 66, the ink tries to flow over the front end surface and flow into the inner peripheral surface side of the wall surface portion 63. However, in the present embodiment, the meniscus M is formed by the ink that is in contact with the front end surface 66A and the inner peripheral surface of the lower end surface 65 or the wall surface portion 88, and this meniscus M flows into the inner peripheral surface of the ink. To prevent. As a result, it is possible to satisfactorily suppress ink from entering the internal space formed by the flow path member 80 and the case member 60. Therefore, it is possible to prevent corrosion and the like on the electronic components on the circuit board 90 due to the penetrating ink. At this time, it is not necessary to apply a filler or the like for closing the gap G.

  Here, in the present embodiment, since the convex portion 66 is formed on the inner peripheral surface side with respect to the inner peripheral surface of the wall surface portion 88, the predetermined meniscus M is formed well in combination with the dimension between the points α and β. be able to. For example, the meniscus M can be easily formed by setting the gap G> (α−β).

  As shown in detail in FIG. 3, a plurality of grooves 97 for guiding the leaked ink to the wall surface portion 88 are formed on the upper surface portion 86 of the cover member 82 in the recording head 10 according to the present embodiment. In the present embodiment, the ink supply needle 100 is formed from the end portion of the opening portion 87 toward the wall surface portion 88 so as to correspond to the opening portion 87 from which the ink supply needle 100 is exposed. This is because there is a high possibility of ink leakage in this portion. Further, in the cover member 82, an exposed opening 89 that exposes the connection port of the connector 92 is formed in a region facing the connector 92 (see FIG. 1), but leaked around the exposed opening 89 as well. A groove 98 that guides the ink to the wall surface 88 is formed.

  In this embodiment in which the grooves 97 and 98 are formed in this way, when the ink leaked due to liquid leakage adheres to the upper surface of the cover member 82 or adheres to the vicinity of the exposed opening 89, the leaked ink is 97 and 98 are guided to the wall surface portion 88. As a result, the leaked ink guided to the wall surface portion 88 travels along the surface of the wall surface portion 88 by its own weight, reaches the boundary portion between the wall surface portions 88 and 63, and is captured by this portion in the same manner as described above.

  As mentioned above, although one embodiment of the present invention was described, of course, the present invention is not limited to this embodiment.

  For example, in the above embodiment, a plurality of grooves 97 that guide the leaked ink to the upper surface portion 86 of the cover member 82 to the wall surface portion 88 are formed, and leaks around the exposed opening 89 that exposes the connection port 93 of the connector 92. Although the groove 98 for guiding the ink to the wall surface portion 88 is formed, these are not always necessary. However, when the grooves 97 and 98 are formed, it is possible to satisfactorily suppress ink penetration into the inside by guiding the leaked ink to the grooves 97 and 98.

  Moreover, in the said embodiment, although the flow path member illustrated what comprised the flow path member main body and the cover member, the structure of a flow path member is not specifically limited. For example, the flow path member may be one in which a flow path member main body and a cover member are integrally formed.

  In the above embodiment, the pressure generating element is exemplified by a thin film type piezoelectric element. However, the configuration of the pressure generating element is not particularly limited, and for example, a thick film type formed by a method of attaching a green sheet or the like. Or a longitudinal vibration type piezoelectric element in which piezoelectric materials and electrode forming materials are alternately laminated to expand and contract in the axial direction. In addition, as a pressure generating element, a heat generating element is arranged in the pressure generating chamber, and droplets are ejected from the nozzle by bubbles generated by the heat generated by the heat generating element, or static electricity is generated by generating static electricity between the diaphragm and the electrode. A so-called electrostatic actuator that deforms the diaphragm by force and ejects droplets from the nozzle can be used.

  Further, the recording head of the above embodiment constitutes a part of an ink jet recording head unit having an ink flow path communicating with an ink cartridge or the like, and is mounted on the ink jet recording apparatus. FIG. 7 is a schematic view showing an example of the ink jet recording apparatus.

  As shown in FIG. 7, the recording head units 1A and 1B having the recording head are detachably provided with cartridges 2A and 2B constituting the ink supply means, and the carriage 3 on which the recording head units 1A and 1B are mounted includes: A carriage shaft 5 attached to the apparatus body 4 is provided so as to be movable in the axial direction. The recording head units 1A and 1B eject, for example, a black ink composition and a color ink composition, respectively.

  The driving force of the driving motor 6 is transmitted to the carriage 3 via a plurality of gears and timing belt 7 (not shown), so that the carriage 3 on which the recording head units 1A and 1B are mounted is moved along the carriage shaft 5. The On the other hand, the apparatus body 4 is provided with a platen 8 along the carriage shaft 5, and a recording sheet S that is a recording medium such as paper fed by a paper feed roller (not shown) is wound around the platen 8. It is designed to be transported.

  In the above-described embodiment, the ink jet recording head has been described as an example of the liquid ejecting head. However, the present invention is intended for a wide range of liquid ejecting heads and liquid ejecting apparatuses including the same. Various recording heads used in image recording devices such as printers, color material ejection heads used in the manufacture of color filters such as liquid crystal displays, organic EL displays, electrode material ejections used in the formation of electrodes such as FEDs (field emission displays) The present invention can also be applied to a head and a bio-organic matter ejecting head used for biochip production.

DESCRIPTION OF SYMBOLS 10 Recording head, 20 Head main body, 60 Case member, 61 Through-hole, 62 Supply path, 63 Wall surface part, 64 Upper end surface, 65 Lower end surface, 66 Convex part,
66A tip surface, 67 convex portion, 67A tip surface, 68 space, 70 cover head, 71 window, 80 channel member, 81 channel member body, 82 cover member, 83 fixing unit, 84 channel forming unit, 85 ink supply Hole, 86 upper surface portion, 87 opening portion, 88 wall surface portion, 89 exposure opening portion, 90 circuit board, 91 connection hole, 91 connection hole, 92 connector, 93 connection port, 95 seal member, 96 supply communication path, 100 ink supply Needle, 101 Through passage, 110 Filter, 120 Fastening member, G gap, M meniscus

Claims (6)

A head main body for ejecting liquid droplets, a case member to which the head main body is fixed, and a liquid supply path that is housed in a cover member that is a box-shaped member that opens on the case member side and through which liquid flows. And a circuit board that is housed and fixed in an internal space formed by the case member and the flow path member and to which the pressure generating element of the head body is connected. Head,
The upper end surface of the wall surface portion of the case member extending toward the flow path member side is opposed to the lower end surface of the wall surface portion of the cover member extending around the liquid supply path and extending toward the case member side. Configured,
And while the said lower end surface has the convex part which opposes through the gap | interval between the said upper end surface while projecting to the said case member side in the outer peripheral side,
The upper end surface protrudes toward the cover member on the inner peripheral surface side of the inner peripheral surface of the wall surface portion of the cover member, and the front end surface is located closer to the cover member side than the front end surface of the convex portion on the outer peripheral side. A liquid ejecting head having a convex portion. The liquid ejecting head according to claim 1,
A liquid ejecting head, wherein a space serving as a liquid storage portion communicated with the gap is formed between the outer peripheral convex portion and the inner peripheral convex portion. In the liquid ejecting head according to claim 1 or 2,
The liquid ejecting head according to claim 1, wherein a liquid meniscus is formed between an outer peripheral end of the tip end surface and the lower end surface of the convex portion on the inner peripheral side. In the liquid jet head according to any one of claims 1 to 3,
The liquid jet head according to claim 1, wherein the cover member has a plurality of grooves for guiding the leaked liquid to the wall surface portion. In the liquid jet head according to any one of claims 1 to 4,
An exposed opening for exposing the connection port of the connector is formed in the cover member in a region facing the connector disposed on the circuit board and connected to external wiring, and a groove for guiding leaked liquid to the wall surface is formed. The liquid ejecting head is formed around the exposed opening.   A liquid ejecting apparatus comprising the liquid ejecting head according to claim 1.

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