JP2013052512A - Liquid jetting head and liquid jetting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid jetting head and a liquid jetting device, configured to have reduced number of parts to reduce material cost and assembling cost, while preventing leakage of liquid.SOLUTION: The liquid jetting device includes: a circuit board 40 disposed between a head body 30 and a flow channel member 20, and having larger area than the head body 30; and a lid member 50 in contact with the head body 30 circumferentially on the outside of a liquid jetting surface and in contact with the flow channel member 20 circumferentially on the outside of the circuit board 40, to form space for hermetically sealing the circuit board 40 between the flow channel member 20 and the head body 30. An inner circumferential seal member 55 for hermetically sealing the lid member 50 and the head body 30 is formed in one of the lid member 50 and the head body 30 by two-color molding, and an outer circumferential seal member 52 for hermetically sealing the lid member 50 and the flow channel member 20 is formed in one of the lid member 50 and the flow channel member 20 by two-color molding.

Description

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

  In an ink jet recording head which is an example of a liquid ejecting head, a pressure change is generated in a pressure generating chamber communicating with a nozzle opening, and ink droplets are ejected from the nozzle opening.

  Here, the ink jet recording head includes a head main body that ejects ink droplets, a flow path member provided on the opposite side of the liquid ejection surface from which the ink droplets of the head main body are ejected, a head main body and a flow path member. And a circuit board provided between the two (see, for example, Patent Document 1).

  In this ink jet recording head, the circuit board is wider than the liquid ejecting surface of the head main body, and therefore, between the head main body and a holding member such as a carriage that holds the ink jet recording head, and between the flow path member and the holding member. A sealing member such as rubber is held on the circuit board, and the circuit board is sealed in a space defined by the holding member, the head body, and the flow path member.

JP 2008-32794 A

  However, in the configuration as in Patent Document 1, the two positions between the head main body and the holding member and between the flow path member and the holding member differ depending on component tolerances, pressure errors in the lamination direction of the lamination members, and the like. There is a problem that it may be located at a height, and it is difficult to seal different heights with one seal member.

  In addition, when the ink jet recording head is mounted on the ink jet recording apparatus, the liquid ejecting surface of the head main body needs to be provided close to the recording medium such as paper, but the head main body in the transport direction of the recording medium Since a transport means such as a roller for transporting the recording medium is arranged before and after the liquid ejecting surface, a space is required before and after the liquid ejecting surface of the head body, particularly in a region facing the circuit board of the holding member. It becomes. For this reason, it is necessary to arrange two places to be sealed between the head main body and the holding member and between the flow path member and the holding member at different heights.

  Further, since the seal member seals two regions as a single unit, the seal member has a complicated shape, and it is necessary to position the seal member. Therefore, the assembly work is complicated, and ink due to poor positioning of the seal member. There are problems such as the possibility of leakage.

  By the way, although it is possible to make the circuit board smaller than the head body so that it fits on the side opposite to the liquid ejecting surface of the head body, in order to make the circuit board smaller, a multilayer circuit There is a problem that it is necessary to use a substrate and the cost becomes high.

  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.

  SUMMARY An advantage of some aspects of the invention is that it provides a liquid ejecting head and a liquid ejecting apparatus that can reduce the number of parts to reduce material costs and assembly costs, and can suppress liquid leakage. And

An aspect of the present invention that solves the above problems includes a head main body that ejects liquid, a flow path member that is provided on a surface of the head main body opposite to the liquid ejecting surface that ejects liquid, the head main body, and the flow body. A circuit board having a larger area than the head main body, and abutting the head main body in the circumferential direction outside the liquid ejecting surface, and the circuit on the flow path member. A lid member that abuts in the circumferential direction outside the substrate and defines a space for sealing the circuit board between the flow path member and the head body, and the lid member and the head An inner peripheral seal member that seals between the main body is formed by two-color molding on either the lid member or the head main body, and an outer peripheral seal that seals between the lid member and the flow path member What is the member of the lid member and the flow path member? Lying in the liquid jet head, characterized in that one is formed by two-color molding or.
In this aspect, by providing the lid member, the circuit board is not exposed to the outside, and can be prevented from coming into contact with the circuit board at the time of handling the liquid ejecting head, etc. It is possible to suppress adhesion of foreign matters such as dust. Further, the number of parts can be reduced by integrating the lid member or the head main body and the flow path member with the inner peripheral seal member and the outer peripheral seal member by two-color molding. Further, positioning of the outer peripheral seal member and the inner peripheral seal member with respect to the lid member, the head main body, and the flow path member is not necessary, so that the assembly can be simplified and the positional deviation of the outer peripheral seal member and the inner peripheral seal member is caused. Intrusion of liquid can be suppressed.

  Here, it is preferable that the inner peripheral seal member and the outer peripheral seal member are provided at different heights in the stacking direction of the head body and the flow path member. According to this, an unnecessary design of the liquid ejecting head is not required, the size can be reduced, a space can be secured around the liquid ejecting surface, and the transporting unit or the like when mounted on the liquid ejecting apparatus. The liquid ejecting surface can be brought close to the recording medium.

  Further, on the other side of the lid member and the head body where the inner peripheral seal member is not provided, an inner peripheral rib that contacts the inner peripheral seal member is provided at a position facing the inner peripheral seal member. On the other side of the lid member and the flow path member where the outer peripheral seal member is not provided, an outer peripheral rib that contacts the outer peripheral seal member is provided at a position opposite to the outer peripheral seal member. It is preferable. According to this, a desired area | region can be sealed more reliably by making a rib and a sealing member contact and sealing.

According to another aspect of the invention, there is provided a liquid ejecting apparatus including the liquid ejecting head according to the above aspect and a holding member that holds the liquid ejecting head.
In this aspect, since the circuit board is sealed by the lid member before the liquid ejecting head is held by the holding member, it is possible to suppress problems such as foreign matter adhering to the circuit board of the liquid ejecting head alone. it can. In addition, it is possible to realize a liquid ejecting apparatus that can be reduced in size and suppressed from breaking the circuit board due to liquid intrusion.

  Further, the holding member may be provided in the apparatus main body so as to be movable in a direction intersecting with the conveyance direction of the recording medium.

FIG. 2 is an exploded perspective view of a recording head according to Embodiment 1 of the invention. FIG. 2 is an exploded perspective view of a recording head according to Embodiment 1 of the invention. FIG. 3 is a plan view of the recording head according to the first embodiment of the invention. FIG. 3 is a cross-sectional view of the recording head according to the first embodiment of the invention. FIG. 2 is an enlarged cross-sectional view of a main part of the recording head according to Embodiment 1 of the invention. 1 is a schematic perspective view of a recording apparatus according to Embodiment 1 of the present invention.

Hereinafter, the present invention will be described in detail based on embodiments.
(Embodiment 1)
1 and 2 are exploded perspective views of the main part of an ink jet recording head which is an example of a liquid jet head according to Embodiment 1 of the present invention, and FIG. 3 is a plan view of the ink jet recording head. 4 is a cross-sectional view taken along line AA ′ of FIG. 3, and FIG. 5 is an enlarged cross-sectional view of the main part of FIG.

  As shown in the drawing, an ink jet recording head 10 which is an example of a liquid ejecting head according to Embodiment 1 of the present invention includes a flow path member 20, a head body 30 provided on one surface side of the flow path member 20, The circuit board 40 provided between the flow path member 20 and the head main body 30 and the lid member 50 provided on the head main body 30 side of the flow path member 20 are provided.

  The flow path member 20 is connected to liquid storage means such as an ink tank or ink cartridge in which ink is stored as an external liquid, directly or via a tube or the like, and supplies ink from the liquid storage means to the head main body 30. It is. Specifically, as shown in FIG. 1, the flow path member 20 is formed with an inlet 21 to which a liquid storage means (not shown) is connected on one surface. The ink introduced from the introduction port 21 is supplied to an internal liquid flow path (not shown), and the ink in the liquid supply path is supplied to the head body 30 from the supply port 22 shown in FIG.

  Although not particularly illustrated, the flow path member 20 includes a filter that removes bubbles and foreign matters contained in the ink, and ink that opens and closes according to the pressure of the liquid flow path on the downstream side and flows from upstream to downstream. A valve mechanism for controlling the flow of the ink and a heating means for heating the ink in the liquid channel may be provided.

  As shown in FIG. 2, an outer peripheral rib 23 that is continuous in the circumferential direction on the outer peripheral side of the flow path member 20 is provided on the surface side where the supply port 22 of the flow path member 20 opens. The outer peripheral rib 23 is continuously provided on the outer peripheral side of the flow path member 20 in the circumferential direction, so that the outer periphery of the circuit board 40 sandwiched between the flow path member 20 and the head body 30 described later in detail. Are provided continuously in the circumferential direction. Such an outer peripheral rib 23 is in pressure contact with an outer peripheral seal member 52 of the lid member 50 described later in detail, and seals between the flow path member 20 and the lid member 50.

  The head main body 30 is provided with a liquid ejecting surface 31 on which a nozzle that ejects ink droplets as a liquid opens on the side opposite to the surface fixed to the flow path member 20. Further, inside the head main body 30 (not shown) are provided a liquid flow path communicating with the nozzles, a pressure generating means for causing a pressure change in the ink in the liquid flow path, and the like. As such pressure generating means, for example, the volume of the liquid flow path is changed by deformation of a piezoelectric actuator having a piezoelectric material exhibiting an electromechanical conversion function to cause a pressure change in the ink in the liquid flow path, and the ink from the nozzle A device that ejects droplets, a heating element placed in the liquid flow path, and a device that ejects ink droplets from the nozzle by bubbles generated by the heat generated by the heating device, or generates static electricity between the diaphragm and the electrode Thus, it is possible to use a so-called electrostatic actuator that discharges ink droplets from the nozzles by deforming the diaphragm by electrostatic force.

  Further, a flange portion 32 that protrudes in the surface direction of the liquid ejecting surface 31 is provided on the side opposite to the liquid ejecting surface 31 of the head body 30. The flange portion 32 is provided so as to protrude from the side surface of the head body 30 (the surface intersecting the liquid ejecting surface 31) in the surface direction of the liquid ejecting surface 31 around the liquid ejecting surface 31.

  On the surface of the flange portion 32 on the liquid ejecting surface 31 side, an inner peripheral rib 33 protruding in the liquid ejecting direction is continuously provided along the outer periphery in the circumferential direction.

  The inner peripheral rib 33 is in pressure contact with an inner peripheral seal member 55 of the lid member 50 described later in detail, and seals between the head main body 30 and the lid member 50.

  A circuit board 40 is provided on the side of the head body 30 opposite to the liquid ejection surface 31, that is, on the flange portion 32 side. The circuit board 40 is electrically connected to a pressure generating means (not shown) of the head main body 30 and is electrically connected to external wiring for supplying a print signal or the like from the outside. Etc. are installed.

  Such a circuit board 40 has a larger area than the head body 30. Here, the circuit board 40 having a larger area than the head main body 30 means that the circuit board 40 is larger than the area on the flange portion 32 side where the circuit board 40 opposite to the liquid ejecting surface 31 of the head main body 30 is provided. Say that the area is large. As a result, a part of the circuit board 40 protrudes from one side surface that intersects the surface of the head body 30 on which the liquid ejection surface 31 and the circuit board 40 are provided.

  Thus, by providing the circuit board 40 with a relatively large area, it is possible to provide a large number of wirings on a relatively small number of stacked circuit boards 40 as compared to using a circuit board in which a large number of wirings are stacked. Therefore, the cost can be reduced. That is, if the number of stacked substrates constituting the circuit board 40 is increased, the wiring can be provided in multiple stages, so that the area of the circuit board 40 can be reduced, but the circuit board 40 having a large number of stacked substrates is It becomes expensive.

  The head body 30 is preferably formed to be relatively small. This is because, when the head body 30 is formed using a thermoplastic resin having excellent heat resistance as a resin material, it is difficult to mold a large resin member that covers the circuit board 40 and the cost becomes high. It is. For this reason, the head main body 30 is made as small as possible, and the circuit board 40 having a larger area than the head main body 30 is used to suppress molding defects of the resin member constituting the head main body 30 and to reduce the head main body 30 and the circuit board. The increase in cost of 40 can be suppressed.

  Further, a connector 41 to which external wiring is connected is formed in a region protruding from the head main body 30 of the circuit board 40. The connector 41 is provided on the side opposite to the head body 30 in a direction in which external wiring is inserted and connected in the ink droplet ejection direction.

  As shown in FIG. 3, the flow path member 20 is provided with an insertion port 24 penetrating in the thickness direction at a position opposite to the connector 41, and the external wiring is different from the flow path member 20. It is connected to the connector 41 through the slot 24.

  The head body 30 and the flow path member 20 are fixed with the circuit board 40 sandwiched therebetween. At this time, a seal member 45 that seals between the supply port 22 and the liquid flow path of the head main body 30 is provided between the circuit board 40 and the flow path member 20. The seal member 45 has a plate shape formed of a material such as rubber or elastomer, and ink leaks from the connection portion when the supply port 22 of the flow path member 20 and the liquid flow path of the head body 30 are connected. It is for not to do.

  A lid member 50 is provided on the assembly of the flow path member 20 and the head main body 30 integrated with the seal member 45 interposed therebetween.

  The lid member 50 is made of a plate-like member formed of a resin material, has substantially the same size as the surface side to which the head main body 30 of the flow path member 20 is fixed, and the head main body 30 of the flow path member 20 is fixed. Fixed to the surface.

  As shown in FIGS. 4 and 5, a wall portion 51 that protrudes toward the flow path member 20 is provided on the surface of the lid member 50 on the flow path member 20 side. The wall portion 51 is provided continuously along the outer periphery of the lid member 50 over the circumferential direction of the outer periphery.

  Further, the lid member 50 is provided with an outer peripheral seal member 52 along the wall portion 51 on the inner side of the wall portion 51, that is, on the inner peripheral surface.

  The outer peripheral seal member 52 is formed of rubber, elastomer, or the like, and is continuously provided in the inner side (inner peripheral surface) of the wall portion 51 along the outer periphery of the lid member 50 in the circumferential direction like the wall portion 51. It has been. Further, the outer peripheral seal member 52 is formed at substantially the same height as the wall portion 51 protruding to the flow path member 20 side.

  Further, the lid member 50 is provided with an insertion hole 53 through which the liquid ejection surface 31 of the head main body 30 can be inserted in a region facing the head main body 30.

  The insertion hole 53 has an opening area larger than the liquid ejection surface 31 of the head body 30 and an opening area smaller than the flange portion 32 of the head body 30. Thus, when the head main body 30 is inserted into the insertion hole 53 of the lid member 50 and the lid member 50 is fixed to the flow path member 20, the flange portion 32 of the head main body 30 is connected to the insertion hole 53 of the lid member 50. Abut against the periphery.

  Further, the surface of the lid member 50 on the flow path member 20 side is provided with a groove portion 54 that communicates with the insertion hole 53 along the inner circumference of the insertion hole 53 along the circumferential direction of the inner circumference.

  An inner peripheral seal member 55 is provided in the groove portion 54 along the inner periphery of the insertion hole 53 along the circumferential direction of the insertion hole 53. In the present embodiment, the inner peripheral seal member 55 is provided by being filled in the groove portion 54. That is, the inner peripheral seal member 55 is formed in the groove 54 with a width that is substantially flush with the inner circumferential surface of the insertion hole 53 and a thickness that is substantially flush with the surface of the lid member 50 on the flow path member 20 side. Has been.

  The inner peripheral seal member 55 is formed of rubber, elastomer or the like, like the outer peripheral seal member 52.

  As described above, the inner peripheral seal member 55 is provided by being filled in the groove portion 54 of the lid member 50, and the outer peripheral seal member 52 is provided on the inner peripheral surface of the wall portion 51 provided to protrude toward the flow path member 20 side. Since it is provided, the inner peripheral seal member 55 and the outer peripheral seal member 52 are provided at different positions on the lid member 50. Here, the height of the lid member 50 refers to the thickness direction in the stacking direction of the flow path member 20, the head body 30, and the lid member 50. Therefore, the inner peripheral seal member 55 and the outer peripheral seal member 52 are provided at different positions in the stacking direction of the lid member 50.

  When such a lid member 50 is fixed to the assembly in which the flow path member 20 and the head main body 30 are assembled, the inner peripheral sealing member 55 of the lid member 50 is connected to the inner periphery provided on the flange portion 32 of the head main body 30. The boundary between the lid member 50 and the head main body 30 is sealed by pressing against the rib 33. At the same time, the outer peripheral seal member 52 of the lid member 50 is in pressure contact with the outer peripheral rib 23 provided on the outer peripheral side of the flow path member 20 to seal the outer seam between the flow path member 20 and the lid member 50. Thus, a space sealed by the inner peripheral seal member 55 and the outer peripheral seal member 52 is defined between the flow path member 20, the head main body 30, and the lid member 50, and a circuit is formed in the sealed space. The substrate 40 is held.

  As a result, the circuit board 40 having a larger area than the head body 30 is held in the space sealed by the lid member 50 without being exposed to the outside. Therefore, it is possible to suppress problems such as contact with the circuit board 40 and the occurrence of breakage such as disconnection of the wiring of the circuit board 40 or short circuit due to adhesion of foreign substances such as liquid such as ink or dust. .

  The lid member 50, the outer peripheral seal member 52, and the inner peripheral seal member 55 can be integrally formed by two-color molding. Thereby, compared with the case where the plate-shaped inner peripheral seal member 55 and the outer peripheral seal member 52 that are separate from the lid member 50 are used, the number of parts can be reduced, and the manufacturing cost can be reduced. .

  Further, the lid member 50, the outer peripheral seal member 52, and the inner peripheral seal member 55 are integrally formed by two-color molding, so that the lid member 50 is simply positioned with respect to the flow path member 20 and the head main body 30. Then, the inner peripheral seal member 55 and the outer peripheral seal member 52 are positioned with respect to the flow path member 20 and the head main body 30. Therefore, the assembling work of the ink jet recording head 10 can be simplified and the cost can be reduced. That is, when the plate-like inner peripheral seal member 55 and the outer peripheral seal member 52 that are separate from the lid member 50 are used, the inner peripheral seal member 55 and the flow path member 20 and the head main body 30 The outer peripheral seal member 52 must be positioned, and the assembly work becomes complicated. In particular, when the outer peripheral seal member 52 and the inner peripheral seal member 55 are provided at different heights, the outer peripheral seal member 52 and the inner peripheral seal member 55 may have to be provided separately. When the member 52 and the inner peripheral seal member 55 are separated from each other, they must be positioned with respect to the lid member 50, and the positioning work becomes complicated and the outer peripheral seal member 52 and the inner peripheral seal member The position shift of the outer peripheral seal member 52 and the inner peripheral seal member 55 is likely to occur, and there is a possibility that the ink or the foreign matter may enter the inside. In this embodiment, even if the outer peripheral seal member 52 and the inner peripheral seal member 55 provided at different heights are provided integrally or separately, the outer peripheral seal member 52 and the inner peripheral seal member 55 are not covered. Since the member 50 is integrally formed by two-color molding, the positioning work of the outer peripheral seal member 52 and the inner peripheral seal member 55 is not required, and the work can be simplified and the outer peripheral seal member 52 and the inner periphery can be simplified. The positional deviation of the seal member 55 can be suppressed, and ink and dust can be prevented from entering the space in which the circuit board 40 is held.

  In addition, the inner peripheral seal member 55 and the outer peripheral seal member 52 may be provided continuously in a part, and the inner peripheral seal member 55 and the outer peripheral seal member 52 are completely independent and discontinuous. You may provide so that it may become. In this embodiment, as shown in FIG. 1, the inner peripheral seal member 55 and the outer peripheral seal member 52 are partially continuous at the opening edge portion of the insertion hole 53. As a result, when the lid member 50, the inner peripheral seal member 55, and the outer peripheral seal member 52 are molded in two colors, the rubber or elastomer melted in the mold becomes a region that becomes the inner peripheral seal member 55 and the outer peripheral seal member 52. Filling can be facilitated, and occurrence of poor filling can be suppressed.

  Further, in the present embodiment, the positioning of the lid member 50 with respect to the flow path member 20 and the head main body 30 is performed by placing the flange portion 32 of the head main body 30 on the surface of the lid member 50 on the flow path member 20 side, as shown in FIG. A pair of positioning projections 56 that contact a pair of side surfaces (a side surface on which the circuit board 40 protrudes and a side surface on the opposite side) are provided, and the flange portion 32 of the head body 30 is sandwiched between the pair of positioning projections 56. Thus, the lid member 50 is positioned with respect to the assembly in which the flow path member 20 and the head main body 30 are integrated. Incidentally, a clearance is provided between the pair of positioning projections 56 and the flange portion 32 of the head main body 30. This clearance is for facilitating insertion of the flange portion 32 of the head main body 30 between the pair of positioning projections 56 when the lid member 50 is positioned on the assembly of the flow path member 20 and the head main body 30. . That is, the flange portion 32 of the head main body 30 may not be inserted between the pair of positioning projections 56 due to dimensional tolerances of the flow path member 20, the head main body 30, the lid member 50, and the like. This clearance is provided in such a size that it can move within a range in which the inner peripheral rib 33 contacts the inner peripheral seal member 55 and within a range in which the outer peripheral rib 23 contacts the outer peripheral seal member 52. That is, if the clearance between the positioning projection 56 and the flange portion 32 is too large, the inner peripheral rib 33 and the inner peripheral seal member 55 do not contact each other, and the outer peripheral rib 23 and the outer periphery seal member 52 do not contact each other. This is because it is not sealed.

  Further, a reinforcing portion 57 that protrudes toward the circuit board 40 is provided in a region of the lid member 50 facing the circuit board 40. And the recessed part 58 is provided in the surface at the side of the liquid ejection surface 31 of the area | region which opposes the circuit board 40 of the cover member 50, and the cover member 50 is compared with the area | region which seals the head main body 30. A region opposite to the circuit substrate 40 (region of the circuit substrate 40 protruding from the head main body 30) is formed thin. When the ink jet recording head 10 is mounted on the ink jet recording apparatus, the recess 58 is relatively wide between the liquid ejecting surface 31 and the recording medium on the side where the circuit board 40 protrudes from the head body 30. A space is defined, and conveying means such as a conveying roller can be arranged.

  The method for fixing the lid member 50 to the flow path member 20 is not particularly limited, but in the present embodiment, the lid member 50 is fixed to the flow path member 20 by a fastening member 60 such as a male screw.

  As described above, in the ink jet recording head 10 of the present embodiment, by providing the lid member 50, the circuit board 40 is exposed to the outside even if the circuit board 40 having a larger area than the head body 30 is used. Therefore, it is possible to suppress contact with the circuit board 40 during handling, and it is possible to prevent foreign matters such as ink and dust from adhering to the circuit board 40.

  Even if the height of the region for sealing the flow path member 20 and the lid member 50 and the region for sealing the head body 30 and the lid member 50 are provided at different positions, the outer periphery of the lid member 50 By forming the seal member 52 and the inner peripheral seal member 55 by two-color molding, two regions having different heights can be reliably sealed. Further, the outer peripheral seal member 52 and the inner peripheral seal member 55 are formed on the cover member 50 by two-color molding, so that the outer peripheral seal member 52 and the inner peripheral seal are formed between the cover member 50, the flow path member 20 and the head body 30. There is no need to position the seal member 55, the assembling work can be simplified, and the positional deviation between the outer peripheral seal member 52 and the inner peripheral seal member 55 can be suppressed to prevent ink from entering due to poor sealing. can do.

  Such an ink jet recording head 10 is mounted on an ink jet recording apparatus. FIG. 6 is a schematic perspective view showing an example of the ink jet recording apparatus. As shown in FIG. 6, in the ink jet recording apparatus 1 of the present embodiment, an ink jet recording head 10 is mounted on a carriage 2 that is a holding member. The carriage 2 on which the ink jet recording head 10 is mounted is provided on a carriage shaft 2 a attached to the apparatus body 7 so as to be movable in the axial direction.

  In addition, the apparatus main body 7 is provided with a storage unit 3 including a tank in which ink is stored, and the ink from the storage unit 3 is stored in the ink jet recording head 10 (flow path member 20) mounted on the carriage 2. Is supplied via the supply pipe 4.

  The driving force of the driving motor 8 is transmitted to the carriage 2 via a plurality of gears and timing belt 8a (not shown), so that the carriage 2 on which the ink jet recording head 10 is mounted is moved along the carriage shaft 2a. . On the other hand, the apparatus body 7 is provided with a platen 9 along the carriage shaft 2a, and a recording sheet S, which is a recording medium such as paper fed by a not-shown paper feed roller, is wound around the platen 9. It is designed to be transported.

  In such an ink jet recording apparatus 1, the carriage 2 is moved along the carriage shaft 2 a and ink is ejected by the head main body 30 of the ink jet recording head 10 to be printed on the recording sheet S.

  As described above, in this embodiment, before the ink jet recording head 10 is mounted on the carriage 2 of the ink jet recording apparatus 1, the circuit board 40 is held in the sealed space by the lid member 50. Therefore, before the ink jet recording head 10 is mounted on the ink jet recording apparatus 1, the wiring of the circuit board 40 is cut by contact, or a foreign substance such as liquid or dust adheres to the circuit board 40 to cause a short circuit. The occurrence of problems such as these can be suppressed.

  In the present embodiment, the inkjet recording head 10 is provided with the lid member 50, and the inkjet recording head 10 provided with the lid member 50 is mounted on the carriage 2. Therefore, when the inkjet recording head 10 is repaired or replaced. Even if the ink jet recording head 10 is attached to or detached from the carriage 2, the sealed state of the lid member 50, the flow path member 20, and the head main body 30 is not released. Incidentally, when the carriage 2 serves as the lid member 50 without providing the lid member 50, the carriage 2, the flow path member 20, and the head main body 30 are sealed with the inner circumferential seal member 55 and the outer circumferential seal member 52. Since the inner seal member 55 and the outer seal member 52 once sealed are elastically deformed, once the flow path member 20 and the head main body 30 are removed from the carriage 2, the flow path member 20 and the head are attached to the same carriage 2. The main body 30 cannot be attached again. That is, every time the ink jet recording head 10 is removed from the carriage 2, the inner peripheral seal member 55 and the outer peripheral seal member 52 need to be replaced, that is, the carriage 2 needs to be replaced. In this embodiment, by providing the lid member 50 on the ink jet recording head 10, even if the ink jet recording head 10 is removed from the carriage 2, the sealed state is not released, and replacement of the carriage 2 or the like becomes unnecessary. Cost can be reduced.

(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. For example, in the first embodiment described above, the inner peripheral seal member 55 and the outer peripheral seal member 52 are integrally formed on the lid member 50 by two-color molding. However, the present invention is not particularly limited to this. The member 55 and the outer peripheral seal member 52 may be integrally formed on the head body 30 and the flow path member 20 by two-color molding, respectively, and the inner peripheral rib 33 and the outer peripheral rib 23 may be provided on the lid member 50 side. Of course, either the inner peripheral seal member 55 or the outer peripheral seal member 52 may be formed on the lid member 50 by two-color molding, and the other may be formed on the head body 30 or the flow path member 20 by two-color molding. .

  In Embodiment 1 described above, the inkjet recording head 10 is provided with the lid member 50, and the inkjet recording head 10 provided with the lid member 50 is mounted on the carriage 2. However, the present invention is not limited to this. The carriage 2 provided with the outer peripheral seal member 52 and the inner peripheral seal member 55 in the same manner as the lid member 50 without using the lid member 50 in the ink jet recording head 10 also serves as the lid member 50 of the first embodiment. Also good.

  Further, in the ink jet recording apparatus 1 described above, the ink jet recording head 10 is mounted on the carriage 2 and moves in the main scanning direction. However, the present invention is not particularly limited thereto. The present invention can also be applied to a so-called line-type recording apparatus that is fixed to the apparatus body 7 and performs printing only by moving a recording sheet S such as paper in the sub-scanning direction. Such a line recording apparatus is not provided with the carriage 2, but a holding member for holding the ink jet recording head 10 on the apparatus main body 7 is provided as an equivalent of the carriage 2.

  In the above-described example, the ink jet recording head 10 is described as an example of the liquid ejecting head and the ink jet recording apparatus 1 is illustrated as an example of the 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), 10 Inkjet recording head (liquid ejecting head), 20 Flow path member, 30 Head main body, 31 Liquid ejecting surface, 40 Circuit board, 41 Connector, 50 Cover member, 52 Outer periphery seal Member, 55 inner periphery sealing member, 60 fastening member

Claims (5)

A head body for ejecting liquid;
A flow path member provided on the side opposite to the liquid ejection surface for ejecting the liquid of the head body;
A circuit board provided between the head body and the flow path member and having a larger area than the head body;
The head main body abuts on the outer side of the liquid ejection surface in the circumferential direction, and contacts the flow path member on the outer side of the circuit board in the circumferential direction. A lid member defining a space for sealing the circuit board therebetween,
An inner peripheral sealing member that seals between the lid member and the head body is formed by two-color molding on either the lid member or the head body,
An outer peripheral sealing member for sealing between the lid member and the flow path member is formed by two-color molding on either the lid member or the flow path member.   2. The liquid jet according to claim 1, wherein the inner peripheral seal member and the outer peripheral seal member are provided at different heights in the stacking direction of the head body and the flow path member. head. On the other side of the lid member and the head body where the inner peripheral seal member is not provided, an inner peripheral rib that contacts the inner peripheral seal member is provided at a position opposite to the inner peripheral seal member. ,
On the other side of the lid member and the flow path member where the outer peripheral seal member is not provided, an outer peripheral rib that contacts the outer peripheral seal member is provided at a position facing the outer peripheral seal member. The liquid jet head according to claim 1 or 2.   A liquid ejecting apparatus comprising: the liquid ejecting head according to claim 1; and a holding member that holds the liquid ejecting head.   The liquid ejecting apparatus according to claim 4, wherein the holding member is provided in the apparatus main body so as to be movable in a direction intersecting a conveyance direction of the recording medium.

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