JP6108060B2 - Liquid ejecting head and liquid ejecting apparatus - 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.

  A typical example of a liquid ejecting head that ejects droplets is an ink jet recording head that ejects ink droplets. As the ink jet recording head, for example, a head main body that ejects ink droplets from nozzle openings and a common flow path member that supplies ink from an ink cartridge (liquid storage member) in which ink is stored to the head main body are provided. What it comprises is proposed.

  In such an ink jet recording head, a flow path through which ink circulates is provided in a plurality of members such as a head main body and a flow path member (head case). By connecting each member, each flow path is One liquid channel is formed in communication (see, for example, Patent Document 1). Thus, when forming one liquid channel from a plurality of members, a seal is provided between each member. For example, a contact portion that protrudes toward the head main body side is provided at the opening edge of the flow path on the head case side, and the liquid flow passage is sealed by applying the contact portion to the head main body side each time. And the seal | sticker is made more reliable by providing and adhering so that the outer periphery of the contact part may be enclosed with an adhesive agent this time.

JP-A-11-300987

  However, a contact portion and an adhesive are required for one liquid flow path when surrounding the opening edge portion. For this reason, if the number of the liquid flow paths increases, the space required for the contact portion and the adhesive increases in proportion thereto, and the head becomes large.

  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 reliably seal a liquid flow path and can be downsized.

In an aspect of the present invention that solves the above problem, a first flow path member provided with a plurality of first flow paths and a second flow path member provided with a plurality of second flow paths are joined with an adhesive, A flow path member having a plurality of liquid flow paths in which the first flow paths and the second flow paths communicate with each other; and a head main body that discharges the liquid supplied from the liquid flow path. At least one of the member and the second flow path member is provided with a contact portion that protrudes and contacts the other side, and the adhesive is provided annularly in each of the plurality of liquid flow paths, and adjacent to each other. The adhesive provided in each of the liquid flow paths is continuous with each other, and the contact portion is provided outside the annular adhesive and is not provided between the adjacent liquid flow paths. The liquid ejecting head is characterized by the above.
In such an aspect, each liquid flow path is sealed with an adhesive and a fitting portion, and between adjacent liquid flow paths is sealed with an adhesive common to the liquid flow paths. According to such a configuration, there is no need to provide a contact portion between the liquid channels, so that a channel member in which the liquid channels are arranged closer to each other can be obtained. Accordingly, a liquid ejecting head having a reduced size in the planar direction of the flow path member (a direction orthogonal to the stacking direction of the first flow path member and the second flow path member) is provided.
Here, at least one of the first flow path member or the second flow path member is provided with a groove at an opening edge of the first flow path or the second flow path, and the adhesive It is preferable that it is provided closer to the contact portion than the inner portion or the groove portion. According to this, it is possible to prevent a part of the adhesive from entering the head main body through the liquid flow path, and it is possible to prevent discharge failure and clogging. Furthermore, it is possible to apply the adhesive not only in the vicinity of the contact portion but also in the groove portion. Thereby, adhesion with the 1st channel member and the 2nd channel member, and a seal of a liquid channel can be made more reliable.
The liquid channel is preferably provided with a filter that crosses the liquid channel closer to the head body than the adhesive. According to this, even if a part of the adhesive peels off and flows downstream with the liquid, it can be captured by the filter.
Further, it is preferable that the contact portion is formed in an annular shape. According to this, it can seal more reliably with respect to all the liquid flow paths, and it can prevent that an adhesive protrudes outside an applicator part.
The head main body has a manifold for storing liquid, a compliance portion for absorbing a pressure change in the manifold, and a compliance space provided to face the compliance portion. An atmosphere opening path that communicates with the compliance space and communicates with the atmosphere is provided, and the atmosphere opening path is defined by the adhesive provided in part between adjacent liquid channels. preferable. According to this, the compliance part can be favorably deformed with the pressure change of the manifold.
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 this aspect, it is possible to realize a liquid ejecting apparatus that can ensure the sealing of the liquid flow path and can be downsized.
Another aspect of the present invention that solves the above problem is that a first flow path member provided with a plurality of first flow paths and a second flow path member provided with a plurality of second flow paths are joined by an adhesive. A flow path member having a plurality of liquid flow paths in which the first flow paths and the second flow paths communicate with each other, and a head body that discharges the liquid supplied from the liquid flow path, At least one of the flow path member or the second flow path member is provided with a contact portion that protrudes and abuts on the other side, and the adhesive includes the first flow path and the second flow passage more than the contact portion. The liquid jet head is characterized in that, on the flow channel side, the first flow channel and the second flow channel are annularly provided at the opening edge portions and are continuous with the other adjacent adhesives.
In such an aspect, each liquid flow path is sealed with an adhesive and a fitting portion, and between adjacent liquid flow paths is sealed with an adhesive common to the liquid flow paths. According to such a configuration, there is no need to provide a contact portion between the liquid channels, so that a channel member in which the liquid channels are arranged closer to each other can be obtained. Accordingly, a liquid ejecting head having a reduced size in the planar direction of the flow path member (a direction orthogonal to the stacking direction of the first flow path member and the second flow path member) is provided.

  Here, at least one of the first flow path member or the second flow path member is provided with a groove at an opening edge of the first flow path or the second flow path, and the adhesive It is preferable that it is provided closer to the contact portion than the inner portion or the groove portion. According to this, it is possible to prevent a part of the adhesive from entering the head main body through the liquid flow path, and it is possible to prevent discharge failure and clogging. Furthermore, it is possible to apply the adhesive not only in the vicinity of the contact portion but also in the groove portion. Thereby, adhesion with the 1st channel member and the 2nd channel member, and a seal of a liquid channel can be made more reliable.

  The liquid channel is preferably provided with a filter that crosses the liquid channel closer to the head body than the adhesive. According to this, even if a part of the adhesive peels off and flows downstream with the liquid, it can be captured by the filter.

  Further, it is preferable that the contact portion is formed in an annular shape. According to this, it can seal more reliably with respect to all the liquid flow paths, and it can prevent that an adhesive protrudes outside an applicator part.

  The head main body has a manifold for storing liquid, a compliance portion for absorbing a pressure change in the manifold, and a compliance space provided to face the compliance portion. An atmosphere opening path that communicates with the compliance space and communicates with the atmosphere is provided, and the atmosphere opening path is defined by the adhesive provided in part between adjacent liquid channels. preferable. According to this, the compliance part can be favorably deformed with the pressure change of the manifold.

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 this aspect, it is possible to realize a liquid ejecting apparatus that can ensure the sealing of the liquid flow path and can be downsized.

FIG. 2 is an exploded perspective view of a recording head according to an embodiment of the invention. It is principal part sectional drawing of the head main body which concerns on embodiment of this invention. It is a top view of a channel member concerning an embodiment of the present invention. 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. 1 is a schematic view of an ink jet recording apparatus according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail based on embodiments.
FIG. 1 is an exploded perspective view illustrating an ink jet recording head which is an example of a liquid ejecting head according to an embodiment of the invention.

  As shown in FIG. 1, the ink jet recording head 10 of the present embodiment includes a head main body 20 that can eject ink droplets as a liquid, a flow path member 30 that supplies ink to the head main body 20, And a wiring board 40 held between the road members 30.

  The flow path member 30 is fixed to the case 250 with the wiring board 40 interposed therebetween. Although details will be described later, the flow path member 30 is provided with a liquid flow path (not shown). The liquid channel is configured such that ink of an ink cartridge (not shown) is introduced via the needle portion 35 and the ink is supplied to the head body 20 via the channel provided in the case 250. ing.

  The head body 20 will be described in detail with reference to FIG. FIG. 2 is a cross-sectional view showing the main part of the head body.

  As shown in FIG. 2, the head body 20 of the present embodiment includes a plurality of actuator units 210, a case 250 that can accommodate the actuator units 210 therein, and a flow path unit 230 that is joined to one surface of the case 250. Are provided.

  The actuator unit 210 of the present embodiment includes a piezoelectric actuator forming member 212 in which a plurality of piezoelectric actuators 211 are arranged in parallel in the width direction, and a distal end (one end) side of the piezoelectric actuator forming member 212 is a free end. A base plate (other end) side has a fixed plate 213 joined as a fixed end.

  The piezoelectric actuator forming member 212 is adjacent to the piezoelectric material 214 and the internal electrodes constituting the two poles of the piezoelectric actuator 211, that is, the individual internal electrodes 215 constituting the individual electrodes electrically independent of the adjacent piezoelectric actuator 211. The piezoelectric actuator 211 and the common internal electrode 216 that constitutes a common electrode that is electrically common are alternately stacked and stacked.

  In the piezoelectric actuator forming member 212, a plurality of slits 217 are formed by, for example, a wire saw or the like, and the front end side is cut into a comb-like shape to form a row of piezoelectric actuators 211.

  The region joined to the fixed plate 213 of the piezoelectric actuator 211 is an inactive region that does not contribute to vibration. When a voltage is applied between the individual internal electrode 215 and the common internal electrode 216 constituting the piezoelectric actuator 211, the fixed plate Only the region on the tip side that is not joined to 213 vibrates. And the front end surface of the piezoelectric actuator 211 is fixed to the island part 240 of the diaphragm 232 mentioned later via an adhesive agent.

  Each piezoelectric actuator 211 is connected to a circuit board 221 such as a COF on which a drive circuit 220 such as a drive IC for driving the piezoelectric actuator 211 is mounted.

  The flow path unit 230 includes a flow path forming substrate 231, a vibration plate 232, and a nozzle plate 233.

  The flow path forming substrate 231 is made of a silicon single crystal substrate, and a pressure generation chamber 235 defined by a plurality of partition walls 234 is arranged in parallel in the width direction (short direction) on the surface layer portion on one surface side. ing.

  A manifold 236 for supplying ink, which is an example of liquid, to each pressure generation chamber 235 is disposed on one end side in the longitudinal direction of each pressure generation chamber 235 via an ink supply path 237, which is an example of a liquid supply path. It is communicated. In addition, the opening surface side of the pressure generation chamber 235 of the flow path forming substrate 231 is sealed with a vibration plate 232, and a nozzle plate 233, which is an example of a nozzle forming member having a nozzle opening 238 formed on the other surface side, is bonded. It is bonded via an agent or a heat welding film. The nozzle opening 238 of the nozzle plate 233 and the pressure generation chamber 235 communicate with each other through a nozzle opening communication hole 239 provided through the flow path forming substrate 231.

  The vibration plate 232 is formed of a composite plate of an elastic film 232a and a support plate 232b, and the elastic film 232a side is joined to the flow path forming substrate 231. The elastic film 232a is formed of an elastic member such as a resin film. Further, the support plate 232b is formed of, for example, a stainless steel plate (SUS).

  In a region facing each pressure generation chamber 235 of the vibration plate 232, an island portion 240 with which the tip of the piezoelectric actuator 211 comes into contact is provided. That is, a thin portion 241 having a thickness thinner than other regions is formed in a region of the diaphragm 232 facing the peripheral portion of each pressure generating chamber 235, and an island portion 240 is provided inside each thin portion 241. Yes. In such an island 240, the tip of the piezoelectric actuator 211 of the actuator unit 210 described above is fixed via an adhesive or the like, for example.

  In a region facing the manifold 236 of the vibration plate 232, similarly to the thin portion 241, a support portion 232b is removed by etching, and a compliance portion 242 configured substantially only by the elastic film 232a is provided. The compliance portion 242 absorbs the pressure change due to the deformation of the elastic film 232a of the compliance portion 242 when a pressure change occurs in the manifold 236, and always keeps the pressure in the manifold 236 constant. Fulfill.

  In the present embodiment, the diaphragm 232 is constituted by the elastic film 232a and the support plate 232b, and the peripheral part of the island part 240 and the compliance part 242 are constituted only by the elastic film 232a. However, the present invention is not limited to this. For example, the island portion 240 and the compliance portion 242 are formed by using a single plate-like member as the vibration plate and providing a concave thin-wall portion obtained by removing a part of the plate-like member in the thickness direction. It may be.

  The case 250 is fixed on the vibration plate 232 of the flow path forming substrate 231, and is connected to the flow path member 30 provided on the opposite side of the vibration plate 232 via the wiring substrate 40, and is not shown. An ink introduction path 251 for supplying ink from a liquid storage unit such as an ink cartridge to the manifold 236 is provided. The ink introduction path 251 communicates with a liquid flow path 80 provided in the flow path member 30 described later.

  The case 250 is provided with a plurality of storage portions 252 penetrating in the thickness direction, and the actuator unit 210 is positioned and fixed to each storage portion 252. In the present embodiment, eight actuator units 210 are provided, and eight accommodating portions 252 are provided so that the actuator units 210 are independently accommodated.

  Further, the case 250 is provided with a compliance space 253 having a concave shape that opens in a region facing the compliance portion 242. The compliance portion 242 is held by the compliance space 253 so as to be deformable. Further, the case 250 is formed with an air communication path 254 communicating with the compliance space 253. As will be described in detail later, the atmosphere communication path 254 communicates with an atmosphere open path provided in the flow path member 30.

  Further, as shown in FIG. 1, the wiring board 40 provided with conductive pads to which each wiring of the circuit board 221 is connected is fixed to the surface of the case 250 opposite to the surface bonded to the diaphragm 232. Has been. The housing part 252 of the case 250 is substantially closed by the wiring board 40. In the wiring substrate 40, a slit-like opening 41 is formed in a region facing the housing portion 252 of the case 250. The circuit board 221 is drawn out of the housing part 252 from the opening 41 of the wiring board 40 and is electrically connected to the wiring board 40 on the surface of the wiring board 40 opposite to the case 250.

  In addition, the wiring board 40 is provided with an insertion portion 42 through which a protrusion 53 (see FIG. 4) provided in the flow path member 30 is inserted, and the flow path of the flow path member 30 inserted through the insertion portion 42. And the ink introduction path 251 communicate with each other.

  In such a head main body 20, when ejecting ink droplets, the volume of each pressure generating chamber 235 is changed by deformation of the piezoelectric actuator 211 and the diaphragm 232 so that ink droplets are ejected from predetermined nozzle openings 238. It has become. Specifically, ink is supplied from an ink cartridge (not shown) to the manifold 236 via a liquid flow path 80 (see FIG. 4) provided in the flow path member 30 and an ink introduction path 251 provided in the case 250. . Ink is distributed from the manifold 236 to the pressure generation chambers 235 through the ink supply path 237. Actually, the piezoelectric actuator 211 is contracted by applying a voltage to the piezoelectric actuator 211. As a result, the diaphragm 232 is deformed together with the piezoelectric actuator 211 to expand the volume of the pressure generation chamber 235, and ink is drawn into the pressure generation chamber 235. Then, after the ink is filled up to the nozzle opening 238, the voltage applied to the electrodes 215 and 216 of the piezoelectric actuator 211 is released in accordance with a recording signal supplied via the circuit board 221. As a result, the piezoelectric actuator 211 is extended to return to the original state, and the diaphragm 232 is displaced to return to the original state. As a result, the volume of the pressure generation chamber 235 contracts, the pressure in the pressure generation chamber 235 increases, and ink droplets are ejected from the nozzle openings 238.

  Here, the flow path member 30 will be described in detail with reference to FIGS. 3 is a plan view showing a flow path member according to an embodiment of the present invention, FIG. 4 is a cross-sectional view taken along line AA in FIG. 3, and FIG. 5 is a cross-sectional view taken along line BB in FIG. It is. 3, the illustration of the second flow path member 32 constituting the flow path member 30 is omitted.

  As shown in the figure, the flow path member 30 is configured by laminating a first flow path member 31 and a second flow path member 32, and a liquid flow path 80 through which ink flows is provided.

  Specifically, the flow path member 30 includes a first flow path member 31 provided on the head main body 20 side and a second flow path member provided on the opposite side of the first flow path member 31 from the head main body 20. 32, and the first flow path member 31 and the second flow path member 32 are laminated. The first flow path member 31 and the second flow path member 32 can be formed from, for example, a resin material, but the material is not particularly limited to the resin material.

  The first flow path member 31 is provided with a first flow path 50 penetrating in the stacking direction (thickness direction). The first flow path 50 includes a first straight portion 51 that penetrates linearly in the thickness direction, and a first tapered portion 52 that communicates with the first straight portion 51. The first taper portion 52 opens toward the second flow path member 32 in the first flow path member 31, and the diameter of the opening gradually decreases toward the first straight section 51.

  Further, a protrusion 53 protruding from the surface of the first flow path member 31 is formed on the head body 20 side of the first flow path member 31. A first straight portion 51 is opened on the top surface of the protrusion 53 (the surface on the head body 20 side). The protrusion 53 is inserted into the insertion portion 42 of the wiring board shown in FIG. 1 so that the first straight portion 51 and the ink introduction path 251 communicate with each other.

  The second flow path member 32 is provided with a second flow path 60 penetrating in the stacking direction (thickness direction). The second flow path 60 includes a second straight portion 61 that penetrates linearly in the thickness direction, and a second tapered portion 62 that communicates with the second straight portion 61. The second taper portion 62 opens toward the first flow path member 31 in the second flow path member 32, and the diameter of the opening gradually decreases toward the second straight section 61.

  A needle portion 35 is provided on the opposite side of the second flow path member 32 from the head body 20. The needle portion 35 is formed integrally with the second flow path member 32, and the inside thereof is formed in a hollow shape and communicates with the second straight portion 61. The needle portion 35 is a portion to which an ink cartridge (not shown) is attached, and ink in the ink cartridge is brought into the inside of the needle portion 35 through an opening portion (not shown) provided in the needle portion 35. It is configured to be introduced.

  On the surface of the first flow path member 31 on the second flow path member 32 side, a contact portion 54 that protrudes toward the second flow path member 32 is provided. The degree contact portion 54 is formed such that its top surface comes into contact with the second flow path member 32. In the present embodiment, as shown in FIG. 3, the stitching portion 54 is integrally formed so as to surround all the first tapered portions 52.

  The first flow path member 31 and the second flow path member 32 are in contact with each other at the contact portion 54, and the first taper part 52 of the first flow path 50 and the second taper part 62 of the second flow path 60 Are arranged so as to face each other.

  The opening edge 55 of the first flow path 50 (opening edge 55 of the first tapered section 52) and the opening edge 65 of the second flow path 60 (opening edge 65 of the second tapered section 62) are as follows. Are bonded with an adhesive 70.

  The adhesive 70 is located on the inner side of the contact portion 54, that is, on the first flow channel 50 and the second flow channel 60 side of the contact portion 54, and the opening edges of the first flow channel 50 and the second flow channel 60. 55, the opening edge 65 is formed in an annular shape.

  In this way, the first flow path 50 and the second flow path 60 communicate with each other so that the ink does not leak to the outside by providing the circular contact portion 54 and the adhesive 70 inside the contact portion 54. As a result, one liquid flow path 80 is formed. That is, the contact portion 54 and the adhesive 70 function as a seal that prevents the ink in the liquid flow path 80 from leaking from the gap between the joint surfaces of the first flow path member 31 and the second flow path member 32. ing.

  Ink is introduced from the ink cartridge into the liquid flow path 80 thus formed via the needle portion 35. The ink passes through a filter 90 described later, and is then supplied to the ink introduction path 251 of the case 250.

  In the present embodiment, eight first flow paths 50 are formed in the first flow path member 31, and eight second flow paths 60 are formed in the second flow path member 32. The first flow path 50 and the second flow path 60 are arranged to face each other and sealed by the annular adhesive 70 and the contact portion 54, and a total of eight liquid flow paths 80 are formed in the flow path member 30. ing.

  As shown in FIG. 5, the liquid flow paths 80 are arranged in parallel in one direction. The annular adhesive 70 formed for each liquid channel 80 is continuous with other adjacent adhesives 70. That is, the contact portion 54 is not provided between the two adjacent liquid flow paths 80, and the adhesive 70 is provided. As described above, the adhesive 70 is provided to function as a seal for the liquid flow path 80 in which the first flow path 50 and the second flow path 60 communicate with each other. Therefore, the adhesive 70 positioned between two adjacent liquid channels 80 is shared as a seal for both the liquid channels 80.

  As described above, in the ink jet recording head 10 according to the above-described embodiment, each liquid flow path 80 is sealed by the adhesive 70 and the contact portion 54, and between the adjacent liquid flow paths 80, those liquid flow paths 80 are sealed. Sealed with an adhesive 70 common to the liquid flow path 80. According to such a configuration, it is not necessary to provide the contact portion 54 between the liquid flow paths 80, so that the flow path member 30 in which the liquid flow paths 80 are arranged closer to each other can be obtained. Thereby, the ink jet recording head 10 in which the size in the planar direction of the flow path member 30 (direction orthogonal to the stacking direction of the first flow path member 31 and the second flow path member 32) is reduced is provided.

  In the prior art, the liquid flow path is sealed by providing a contact portion on the outside of the liquid flow path and an adhesive agent on the outside of the contact section each time. According to such a configuration, not only the adhesive but also the contact portion exists between the adjacent liquid flow paths, and a space must be provided in the plane direction by the amount of the contact portion each time.

  Furthermore, in the present invention, since the adhesive 70 is shared between the adjacent liquid flow paths 80, the amount of the adhesive 70 used can be reduced correspondingly, and the cost can be reduced.

  Here, a groove 56 is provided in the opening edge 55 of the first flow path member 31. The shape of the groove portion 56 is not particularly limited, but may be, for example, an annular shape that surrounds the opening edge portion 55. Further, the adhesive 70 is provided inside the groove portion 56 and closer to the contact portion 54 than the groove portion 56.

  Thereby, even if the adhesive 70 applied to the contact portion 54 side with respect to the groove portion 56 overflows to the liquid channel 80 side before curing, the adhesive 70 can be retained in the groove portion 56. Thereby, it is possible to prevent a part of the adhesive 70 from entering the head main body 20 through the liquid flow path 80, and it is possible to prevent discharge failure and clogging.

  In other words, it is possible to apply the adhesive 70 not only in the vicinity of the fitting portion 54 but also in the groove portion 56. That is, the area where the first flow path member 31 and the second flow path member 32 are bonded can be increased. Thereby, the adhesion between the first flow path member 31 and the second flow path member 32 and the sealing of the liquid flow path 80 can be made more reliable.

  Further, the liquid channel 80 is provided with a filter 90 that crosses the liquid channel 80. More specifically, the filter 90 is disposed in the filter chamber 91 which is a space mainly defined by the first tapered portion 52 and the second tapered portion 62. The size of the filter 90 is larger than the opening of the first tapered portion 52 of the first flow path 50, and the filter 90 is placed on the first flow path member 31 so as to cover the opening. The filter 90 is joined to the first flow path member 31 by heat welding or an adhesive.

  The filter 90 removes foreign matters and bubbles contained in the ink. The filter 90 is not particularly limited, and examples thereof include a linear metal twill, a flat plate member made of SUS provided with a large number of holes, and a non-woven fabric.

  In the present embodiment, the filter 90 is provided closer to the head body 20 than the adhesive 70. That is, the filter 90 is disposed downstream of the adhesive 70 in the liquid channel 80. As a result, even if a part of the adhesive 70 is peeled off and flows downstream along with the ink, it can be captured by the filter 90. That is, this can more reliably prevent a part of the adhesive 70 from entering the head main body 20 via the liquid flow path 80, and can more reliably prevent ejection failure and clogging. it can.

  Further, as described above, the contact portion 54 is formed so as to surround the outside of all the liquid flow paths 80. As a result, all the liquid channels 80 can be more reliably sealed, and the adhesive 70 can be prevented from protruding beyond the contact portion 54.

  As shown in FIG. 5, the flow path member 30 is provided with an air release path 58. A part of the atmosphere opening path 58 is defined by an adhesive 70. Specifically, the first flow path member 31 is provided with a first open path 57 penetrating in the thickness direction, and the second flow path member 32 is provided with a second open path 67 penetrating in the thickness direction. ing. The first open path 57 and the second open path 67 are disposed so as to face each other, and the adhesive 70 is bonded to the opening edges of the first open path 57 and the second open path 67. That is, a space 71 is formed in the adhesive 70 in a region facing the first open path 57 and the second open path 67. An air release path 58 is formed from the first open path 57, the second open path, and the space 71.

  The opening on the head main body 20 side of the atmosphere opening path 58 (the opening on the lower side in FIG. 5) communicates with the compliance space 253 via the atmosphere communication path 254 shown in FIG. Further, the opening on the side of the needle portion 35 of the atmosphere opening path 58 (the opening on the upper side in FIG. 5) communicates with the atmosphere. By configuring such an air release path 58, the compliance space 253 can be opened to the atmosphere. Thereby, the compliance part 242 can be favorably deformed with the pressure change of the manifold 236. Further, since the atmosphere opening path 58 is configured to be sealed by the adhesive 70, air (fluid) from the compliance space 253 leaks from the joint surface between the first flow path member 31 and the second flow path member 32. Can be prevented.

  In the ink jet recording head 10 according to the above-described embodiment, the adhesive 70 between the adjacent liquid channels 80 is shared for all of the eight liquid channels 80, but is limited to such an aspect. Not. In other words, the adhesive 70 may be continuous between at least two adjacent liquid channels 80.

  Moreover, although the allowance part 54 was provided in the 1st flow path member 31, it is not limited to such an aspect. For example, the contact portion 54 may be provided on the second flow path member 32 side, or may be provided on both the first flow path member 31 and the second flow path member 32. Furthermore, the contact portion 54 is provided in an annular shape on the outside of the adhesive 70 so as to surround the periphery thereof, but is not limited to such a mode. For example, the stitching portion 54 may be discontinuous instead of an annular shape. Even in this case, since at least the adhesive 70 functions as a seal for the liquid channel 80, there is no possibility that the liquid leaks from the liquid channel 80.

  The liquid flow path 80 is not limited to the above-described form. For example, the first flow path 50 and the second flow path 60 may both be formed in a straight shape and communicated to form the liquid flow path 80. In this case, the adhesive 70 may be provided in an annular shape at the opening edges of the first flow path 50 and the second flow path 60.

  Further, as the pressure generating means for causing a pressure change in the pressure generating chamber 235, the longitudinal vibration type piezoelectric actuator 211 that alternately laminates the piezoelectric material 214 and the electrodes 215 and 216 and expands and contracts in the axial direction has been described. The pressure generating means is not particularly limited to this, for example, a thin film type in which electrodes and a piezoelectric material are formed by film formation and lithography and a pressure film type formed by a method such as attaching a green sheet. A flexural vibration type piezoelectric actuator can 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. Thus, a so-called electrostatic actuator that discharges liquid droplets from the nozzle openings by deforming the diaphragm by electrostatic force can be used.

  The ink jet recording head 10 is mounted on an ink jet recording apparatus. FIG. 6 is a schematic diagram illustrating an example of an ink jet recording apparatus.

  An ink jet recording apparatus I shown in FIG. 6 has a carriage 3 provided on a carriage shaft 5 attached to the apparatus main body 4 so as to be movable in the axial direction. An ink jet recording head 10 is attached to the carriage 3, and the ink jet recording head 10 is detachably provided with a cartridge 2 for storing a black ink composition and a color ink composition, for example.

  The driving force of the driving motor 6 is transmitted to the carriage 3 through a plurality of gears and timing belt 7 (not shown), so that the carriage 3 on which the ink jet recording head 10 is mounted is moved along the carriage shaft 5. . 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 ink jet recording apparatus I described above, the ink jet recording head 10 is mounted on the carriage 3 and moved 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 in which printing is performed simply by moving a recording sheet S such as paper in the sub-scanning direction.

  Furthermore, in the above-described example, the ink jet recording head 10 including the head main body 20 and the flow path member 30 fixed to the head main body 20 has been described. However, the ink jet recording in which the flow path member 30 is provided separately from the head main body 20. The present invention can also be applied to an apparatus. Specifically, the storage means in which ink is stored is not mounted on the carriage 3 but is fixed to the apparatus body 4, and a flow path member 30 is provided at a place where the storage means is installed. An ink jet recording apparatus having a configuration in which the head body 20 mounted on the carriage 3 is connected by a tube-like supply pipe may be used.

  In the above embodiment, 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.

  The present invention is not limited to the flow path member mounted on the liquid ejecting head and the liquid ejecting apparatus, and can be applied to the flow path member mounted on other devices.

  I ink jet recording apparatus (liquid ejecting apparatus), 10 ink jet recording head (liquid ejecting head), 20 head body, 30 flow path member, 31 first flow path member, 32 second flow path member, 50 first flow path , 54 degree contact part, 55, 65 opening edge part, 56 groove part, 58 atmosphere release path, 60 second flow path, 70 adhesive, 80 liquid flow path, 90 filter, 235 pressure generating chamber, 236 manifold, 238 nozzle opening , 242 Compliance Department, 253 Compliance Space, 254 Air Communication Path

Claims (6)

A first flow path member provided with a plurality of first flow paths and a second flow path member provided with a plurality of second flow paths are joined with an adhesive, and each first flow path and each second flow path. A flow path member having a plurality of liquid flow paths communicating with each other;
A head main body for discharging the liquid supplied from the liquid flow path,
At least one of the first flow path member or the second flow path member is provided with a contact portion that protrudes and contacts the other side,
The adhesive is provided annularly in each of the plurality of liquid flow paths,
The adhesive provided in each of the adjacent liquid flow paths is continuous with each other,
The liquid ejecting head, wherein the contact portion is provided outside the annular adhesive and is not provided between the adjacent liquid flow paths . The liquid ejecting head according to claim 1,
At least one of the first flow path member or the second flow path member is provided with a groove at an opening edge of the first flow path or the second flow path.
The liquid ejecting head, wherein the adhesive is provided in the groove portion or closer to the contact portion than the groove portion. The liquid ejecting head according to claim 1 or 2,
The liquid jet head is characterized in that the liquid channel is provided with a filter that crosses the liquid channel closer to the head body than the adhesive. In the liquid jet head according to any one of claims 1 to 3,
The contact portion is formed in an annular shape. In the liquid jet head according to any one of claims 1 to 4,
The head main body has a manifold that stores liquid, a compliance portion that absorbs a pressure change in the manifold, and a compliance space that is provided to face the compliance portion.
The flow path member is provided with an atmosphere open path communicating with the compliance space and communicating with the atmosphere.
A part of the air release path is defined by the adhesive provided between adjacent liquid flow paths.   A liquid ejecting apparatus comprising the liquid ejecting head according to claim 1.

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