JP2005144691A - Liquid jet head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid jet head which enhances the accuracy of form, which protects a circuit board and which can be easily manufactured. <P>SOLUTION: A channel unit 17, which comprises a nozzle plate 22, a pressure generating chamber 26 for pressurizing a liquid by a pressure generating means 30, and a liquid storage chamber 23 for storing the liquid supplied into the chamber 26, is provided with a channel member 35 which is joined to a head case 15 in a state wherein a space 15h is arranged in the head case 15, and which is provided with a channel part 37 for supplying the liquid into the chamber 23; the channel member 35 is constituted as a separate member which is attached to the head case 15; and the channel part 37 exists in the space 15h in a state wherein the channel member 35 is attached to the head case 15. Thus, the channel member 35 serves as an independent component, so that the problem associated with molding can be solved without reference to the head case 15. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an improvement in shape accuracy and a structure simplification of a liquid jet head.

  A liquid ejecting apparatus including a liquid ejecting head that ejects liquid from a nozzle opening is known for various liquids. Among them, a representative one is mounted on an ink jet recording apparatus. An ink ejecting apparatus can be mentioned. Therefore, the prior art will be described taking the ink jet recording apparatus as an example.

  4 to 7 show a conventional technique. FIG. 4 is a perspective view showing an example of the peripheral structure of the ink jet recording apparatus. This apparatus includes a carriage 3 on which an ink cartridge 2 is mounted and an ink ejecting apparatus, that is, a recording head 1 is attached.

  The carriage 3 is connected to a stepping motor 5 via a timing belt 4 and is guided by a guide bar 6 to reciprocate in the paper width direction (main scanning direction) of the recording paper 7. The carriage 3 has a box shape that opens to the top, is attached so that the nozzle surface of the recording head 1 is exposed on the surface (the lower surface in this example) facing the recording paper 7, and accommodates the ink cartridge 2. It is like that.

  Then, ink is supplied from the ink cartridge 2 to the recording head 1 and ink droplets are ejected onto the upper surface of the recording paper 7 while moving the carriage 3 so that images and characters are printed on the recording paper 7 in a dot matrix. Yes. In FIG. 4, reference numeral 8 denotes a cap that prevents the nozzle from being dried as much as possible by sealing the nozzle opening of the ink ejecting apparatus 1 during a printing pause, and 9 is a wiper member that wipes the nozzle surface of the recording head 1. Further, as shown in FIG. 4, a guide bar 6 is inserted into the carriage 3.

  FIG. 5 is a cross-sectional view showing a specific structure of the recording head 1, the carriage 3, the ink cartridge 2, and the like. An ink cartridge fixing lever 12 for fixing the ink cartridge 2 to the upper side of the box-shaped frame 10 corresponding to the carriage 3 and for pushing, pulling up and fixing the ink cartridge 2 into the storage chamber 11 is provided. It has been. The ink cartridge 2 shown in FIG. 4 has six colors mounted thereon, but the one shown in FIG. 5 is an example in which one color ink cartridge 2 is mounted.

  An ink supply needle 14 to be inserted into the ink needle insertion port 13 of the ink cartridge 2 is planted on the bottom surface of the frame 10, and an ink flow path 16 provided from the ink cartridge 2 to a head case 15 to be described later is provided. Thus, ink can be supplied to the flow path unit 17 of the recording head 1.

  Reference numeral 18 denotes a circuit board on which an operation circuit for operating the flow path unit 17 of the recording head 1 is mounted. The circuit board 18 is disposed along the side of the frame 10 as shown in FIG. The circuit board 18 is connected to the flow path unit 17 by a flexible circuit board 19.

  Reference numeral 15 denotes the head case described above, which is made by injection molding a polymer material having durability against an ink solvent, gas barrier properties, injection molding properties, heat welding properties, and adhesive properties, for example, a cyclic olefin copolymer resin. . The base portion 14a of the ink supply needle 14 is fixed in communication with the ink flow path 16 provided in the head case 15, and the head case 15 is fixed to the bottom surface of the frame 10 with screws (not shown). Yes.

  As shown in FIG. 6, the structure of the flow path unit 17 includes a nozzle plate 22 in which nozzle openings 21 are arranged, a flow path forming plate 24 in which an ink storage chamber 23 is formed, and a passage described later. Further, the ink supply port forming plate 25 is bonded in a three-layer structure, and pressure generating chamber forming members 27, 28, and 29 for forming the pressure generating chamber 26 are bonded in layers. The pressure generating chamber forming member 27 is a diaphragm, the member 28 is a frame-like member that forms a space of the pressure generating chamber 26, and the member 29 is a bottom plate. The piezoelectric vibrator 30 for pressurizing the ink in the pressure generating chamber 26 is of a so-called chips type in a flexural vibration mode. The thicknesses of the nozzle plate 22, the flow path forming plate 24, the ink supply port forming plate 25, etc. that form the flow path unit 17 are exaggerated for easy understanding of the flow path structure. Actually, the thickness is as shown in FIG.

  The flow path unit 17 is joined to the head case 15 via an adhesive 34.

  A passage 31 to the ink storage chamber 23 is provided in the ink supply port forming plate 25, and a passage 32 for supplying ink from the ink storage chamber 23 to the pressure generation chamber 26 is provided in the ink supply port forming plate 25 and the bottom plate 29. A passage 33 communicating the pressure generating chamber 26 and the nozzle opening 21 is provided in the bottom plate 29, the ink supply port forming plate 25, and the flow path forming plate 24. The piezoelectric vibrator 30, the pressure generating chamber 26, the nozzle opening 21 and the like are arranged in a direction perpendicular to the paper surface of FIG.

  The ink that has flowed from the ink flow path 16 through the ink storage chamber 23 into the pressure generation chamber 26 is pressurized by the flexural vibration of the piezoelectric vibrator 30 and is ejected from the nozzle opening 21 through the passage 33 as ink droplets.

  As described above, the head case 15 is made of a synthetic resin material by injection molding. However, as shown in FIG. 7, a plurality of ink supply needles 14 corresponding to the type of ink color are arranged. A large area for attaching the ink supply needle 14 is required. On the other hand, the size of the nozzle surface of the flow path unit 17 is set by the arrangement of nozzle rows suitable for ink droplet ejection, and the area thereof is significantly smaller than the mounting area of the ink supply needle 14. Accordingly, the ink flow path 20a from the ink supply needle 14 to the flow path unit 17 needs to be formed in an inclined state as shown in FIG. Further, in order to configure the ink flow path 20a, it is necessary to form a bulging portion 20b that extends continuously as shown in FIG. At the same time, ribs 20c for reinforcing the head case 15 are also formed. FIG. 7B is a cross-sectional view taken along the line (B)-(B) in FIG.

In order to prevent the length of the ink flow path 20a from being too long, the inclination angle of the ink flow path 20a is reduced to some extent, so that the flow path unit 17 is attached to the head case 15 as shown in FIG. In the joined state, a space 15 h is formed in the head case 15.
JP-A-9-216375

  In addition to the molding of the head case 15 itself, the shape shown in FIG. 7 is to mold each ink flow path 20a integrally. The state changes suddenly from thin to thick. Such a sudden change in the thickness causes “shrinkage”, and, for example, the planar accuracy of the mounting surface 14b with which the base portion 14a of the ink supply needle 14 is in close contact is lowered, thereby causing the risk of ink leakage. In order to prevent such “squeezing”, a recessed part or an opening part is arranged in a necessary part. However, depending on the shape of the recessed part or the opening, there is a possibility that the leaked ink may be accumulated. If ink drops, the recording paper 7 may be soiled.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a liquid ejecting head that can prevent a reduction in shape accuracy due to “shrinkage”, protect a circuit board, and is easy to manufacture. It is in.

  In order to achieve the above object, a liquid jet head according to the present invention includes a nozzle plate in which nozzle openings are arranged, a pressure generation chamber that communicates with the nozzle openings and pressurizes liquid by pressure generation means, and the pressure generation chamber. A flow path unit including a liquid storage chamber for storing supplied liquid is a liquid ejecting head joined to the head case in a state where a space is formed in the head case, and supplies the liquid to the liquid storage chamber. A flow path member provided with a flow path portion, wherein the flow path member is configured as another member attached to the head case, and the flow path member is attached to the head case. Is present in the space.

  That is, a flow path member provided with a flow path portion for supplying a liquid to the liquid storage chamber is provided, the flow path member is configured as another member attached to the head case, and the flow path member is a head. The said flow path part exists in the said space in the state attached to the case. Thus, the flow path member and the head case are prepared in the form of separate parts, and the flow path portion is disposed in the space in a state where both parts are assembled. For this reason, the flow path portion can be arranged at a predetermined location in the space with a large degree of freedom, and a liquid supply source attached to the flow path member, for example, liquid from a liquid supply needle is limited to the flow path unit. It can be accurately guided to a predetermined location. Therefore, the flow path member can be set in its own shape so as to perform the necessary function for the component without being affected by the shape of the head case, etc., and the change in the thickness is also “closed”. Can be reduced to a level where there is substantially no problem. Furthermore, the flow path member has a structure in which slanted flow paths and the like are congested, and the mounting surface of the liquid supply needle must be formed with high accuracy. Since the material is molded in a state separated from the head case, accuracy control can be performed properly without being affected by “shrinkage”, and the degree of freedom in the arrangement of molds in injection molding and the like is expanded. The operability of the movable mold is improved, which is effective in terms of productivity.

  For these reasons, for example, the surface accuracy of the mounting surface of the liquid supply needle can be improved so that liquid leakage does not occur. Further, since it is substantially unnecessary to provide a recess or an opening for preventing “squeezing”, the problem of liquid accumulation does not occur.

  In the liquid jet head according to the aspect of the invention, in the case where a bottom member having a flow hole that guides the liquid in the flow path portion to the liquid storage chamber is formed in the bottom portion of the head case, the liquid storage in the flow path portion is stored. The flow path portion inserted into the space of the head case can be supported by the bottom member with high support rigidity in a state where the communication with the chamber is ensured.

  In the liquid ejecting head according to the aspect of the invention, when the seal member is provided between the end portion of the flow path portion and the bottom member, the flow path member is assembled to the head case in the form of a separate part. However, it is possible to reliably prevent liquid leakage.

  In the liquid ejecting head according to the aspect of the invention, the flow path unit has a flat shape, and when the flow path unit is bonded to the opening end of the head case and a part of the bottom member, the bonding is the opening end of the head case. Joining is performed at a plurality of locations between the portion and the location inside the opening. In particular, since the flow path unit has a flat shape, if any external force acts on the flow path unit, the flow path unit is likely to be deformed. The flow path unit can be joined to the head case. The deformation of the above-mentioned flow path unit is likely to appear in a state where the flow path unit is bent, for example, when a cap is attached to the flow path unit and a negative pressure is applied to the nozzle surface to perform a cleaning operation. Such a concern is eliminated by the arrangement of the joints.

  In the liquid ejecting head according to the aspect of the invention, the flow path member may include a liquid supply needle that receives a liquid from a liquid storage source on one side of a base plate that forms the base member, and the flow path portion on the other side. The base plate functions as a basic member for strength, and the liquid supply needle disposed on one side and the flow path portion disposed on the other side are present with high support rigidity. Can do. That is, even if the liquid cartridge is strongly pressed against the liquid supply needle, the liquid supply needle does not tilt. Further, since the flow path portion is also firmly integrated with the base plate, the joining position with the bottom member can be accurately maintained.

  In the liquid jet head according to the present invention, when the wall plate for preventing the liquid from flowing out from a part of the bottom member is erected, the attachment portion of the liquid supply needle or the joint between the flow path portion and the bottom member Even if a liquid leaks from the liquid, the wall plate can prevent the liquid from flowing out, so that no liquid contamination or the like in the peripheral portion occurs.

  In the liquid jet head according to the aspect of the invention, when the wall plate is disposed between the base plate and the circuit board on which the operation signal circuit of the pressure generating unit is disposed, the wall plate leaks for some reason. Since the wall can prevent the liquid from reaching the circuit board, it is possible to prevent the circuit board from being poorly connected, short-circuited, and the like, and a liquid jet head having a highly reliable performance can be obtained.

  In the liquid ejecting head according to the aspect of the invention, when the circuit board is disposed along the wall board near the wall board, the circuit board is disposed without protruding along the wall board. In addition, the circuit board and the wall plate can be gathered in a small space, and the liquid jet head can be made compact.

  In the liquid jet head according to the present invention, when a slit is formed between the wall plate and the head case, the flexible circuit board that sends the signal of the circuit board to the pressure generation unit of the flow path unit is inserted. When joining the flow path unit to the head case, the flexible circuit board can be inserted into the slit first, and then the flexible circuit board can be connected to the circuit board. In addition, the flexible circuit board can be connected together, and the assembly workability is improved.

  In the liquid jet head according to the aspect of the invention, when the pressure generating unit is a piezoelectric vibrator in a flexural vibration mode, the dimension in the thickness direction of the flow path unit is minimized because the piezoelectric vibrator is flat. Accordingly, a large space can be secured, and the flow path member can be easily disposed in the space.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  The liquid ejecting head according to the present invention can function for various liquids as described above. In the illustrated embodiment, as a typical example, the ink ejecting head employed in the ink jet recording apparatus, that is, The recording head is an object of the embodiment.

  1 to 3 show an embodiment of a liquid jet head according to the present invention. Members having the same functions as those described in FIGS. 4 to 7 are denoted by the same reference numerals.

  FIG. 1 is a perspective view showing a state in which the flow path member 35 and the flow path unit 17 are assembled to the head case 15. FIG. 2 is a perspective view of the flow path member 35 taken from the head case 15 and viewed from the back side. FIG. 3 is a cross-sectional view of the assembly of FIG.

  The flow path member 35 is prepared as another component to be attached to the head case 15 and is formed by injection molding of the synthetic resin material as described above. A mounting surface 14b is formed on one side of the base plate 36 that forms the base member of the flow path member 35, to which the base portion 14a in the shape of a flange of the ink supply needle 14 is joined. Further, on the other side of the base plate 36, a flow path portion 37 that is formed integrally with the base plate 36 is provided.

  The flow path portion 37 is composed of a tapered portion 37a formed continuously from the filter 14c and a substantially straight pipe line portion 37b continuous to the tapered portion 37a, and the filter 14c and the ink supply are provided therein. A supply flow path 37 c communicating with the inside of the needle 14 is provided. As described with reference to FIG. 7, the flow path portion 37 configures an inclined flow path similar to the ink flow path 20 a arranged in an oblique direction. Therefore, the flow path part 37 is arranged in an inclined state as shown in FIG. In FIG. 2, the base portion 14 a of the ink supply needle 14 corresponding to each flow path portion 37 is illustrated by a two-dot chain line. Since this embodiment is a case of six colors, six base parts 14a and six flow path parts 37 connected thereto are arranged.

  The outer shape of the head case 15 is a square box shape, and is provided with a bottom member 15b formed integrally with the side wall plate 15a. The bottom member 15 b has a plate shape and is disposed at the bottom of the head case 15. As shown in FIGS. 1 and 3, a flat wall plate 15 c is formed integrally with the bottom member 15 b in a state of standing from the end of the bottom member 15 b, and its upper end has a height required to support the substrate 18. Has been. Thus, the space surrounded by the side wall plate 15a, the bottom member 15b, and the wall plate 15c of the head case 15 is the space 15h.

  As shown in FIG. 3, the wall plate 15c forms a slit 15d that is a space between the wall plate 15c and the side wall plate 15a shown on the right side. A flow hole 15e for supplying ink to the flow path unit 17 is provided in the bottom member 15b, and a supply passage 37c of the flow path section 37 communicates with the flow hole 15e.

  A seal member 38 is interposed at a connection portion between the flow hole 15e and the supply passage 37c. The seal member 38 is made of an elastic material such as rubber or elastomer, and is disposed in a state of being sandwiched between the end of the pipe line portion 37b and the bottom member 15b. The seal member 38 is also provided with a through-opening 38a to establish communication between the supply passage 37c and the flow hole 15e. Note that the flow hole 15e, the communication port 38a, the supply passage 37c, and the like correspond to the ink flow path 16 shown in FIG.

  The bottom member 15b is formed with a joining surface 15f around the circulation hole 15e. The joining surface 15f is a flat surface for joining the flow path unit 17 provided in a part of the bottom member 15b, and has a circular shape centering on the flow hole 15e. The bonding surface 15f is present on the same virtual plane as the opening end of the head case 15, that is, the opening surface 15g. The flow path unit 17 is bonded to both the frame-shaped opening surface 15g and the bonding surface 15f disposed inside the opening surface 15g with an adhesive.

  The flexible circuit board 19 connected to the flow path unit 17 is connected to the circuit board 18 through the slit 15d. And this circuit board 18 is arrange | positioned in the state along the wall board 15c via support means (not shown), such as a support bracket. Since the circuit board 18 is also generally flat, both are arranged in a substantially parallel positional relationship.

  FIG. 3 shows a state in which the cleaning cap 8 is in close contact with the nozzle plate 22 as indicated by a two-dot chain line.

  As shown in FIG. 1, an arrow line 39 indicates the main scanning direction of the recording apparatus, and an arrow line 40 indicates the direction in which the recording paper 7 is fed out.

  When the flow path unit 17 is bonded to the head case 15 using an adhesive, first, the distal end portion of the flexible circuit board 19 connected to the flow path unit 17 is inserted into the lower portion of the slit 15d, and the flexible circuit board 19 is further inserted. Is inserted into the slit 15d, the flexible circuit board 19 is exposed to the upper side of the head case 15 while being guided in the gap-like space of the slit 15d. In this state, the flow path unit 17 is in close contact with the opening surface 15g and the bonding surface 15f, and the above-described close contact portions are bonded via an adhesive (not shown). After the bonding, the flexible circuit board 19 is connected to the circuit board 18 to fix the circuit board 18. As described above, this fixing means can be easily performed using, for example, a bracket member.

  The effects of the above embodiment are listed as follows.

  The flow path member 35 and the head case 15 are prepared in the form of separate parts, and the flow path part 37 is arranged in the space 15h in a state where both parts are assembled. For this reason, the flow path portion 37 can be arranged at a predetermined position in the space 15h with a large degree of freedom, and the ink from the ink supply needles 14 attached to the flow path member 35 is limited to the flow path unit 17. It is possible to accurately lead to a predetermined place (see the passage 31 and FIG. 6). Therefore, the flow path member 35 can be set in its own shape so as to perform a necessary function for the component without being influenced by the shape or the like of the head case 15, and the change in the wall thickness is also “ The occurrence of “shrinking” can be reduced to a level where there is substantially no problem. Furthermore, the flow path member 35 has a structure in which oblique flow paths 37 and the like are congested, and the attachment surface 14b of the ink supply needle 14 must be formed with high accuracy. The portion is molded in a state where the flow path member 35 is separated from the head case 15, so that accuracy control can be properly performed without being affected by “shrinkage”, and the degree of freedom of mold placement in injection molding or the like is increased. This expands and improves the operability of the split movable mold, which is effective in terms of productivity.

  Accordingly, for example, the surface accuracy of the mounting surface 14b of the ink supply needle 14 can be improved so that ink leakage does not occur. In addition, since it is substantially unnecessary to provide a recess or an opening to prevent “squeezing”, the problem of ink stagnation does not occur.

  A bottom member 15b having a flow hole 15e that guides the ink in the flow path portion 37 to the ink storage chamber 23 is formed at the bottom of the head case 15, so that the flow path portion 37 with respect to the ink storage chamber 23 is formed. The flow path portion 37 inserted into the space 15h of the head case 15 can be supported by the bottom member 15b with high support rigidity in a state where the communication is ensured.

  Since the seal member 38 is provided between the end of the flow path portion 37 and the bottom member 15b, ink leakage may occur even when the flow path member 35 is assembled to the head case 15 in the form of a separate part. Can be reliably prevented.

  The flow path unit 17 has a flat shape and is joined to the opening surface 15g of the head case 15 and the joint surface 15f of the bottom member 15b. In this way, the bonding is performed at a plurality of locations of the opening surface 15g of the head case 15 and the bonding surface 15f at the location inside the opening. In particular, since the flow path unit 17 has a flat shape, if any external force acts on the flow path unit 17, the flow path unit 17 is likely to be deformed. However, it is easily deformed by joining at a plurality of locations as described above. In such a state, the flow path unit 17 can be joined to the head case 15. The deformation of the flow path unit 17 is likely to appear when the flow path unit 17 is bent when the cap 8 is brought into close contact with the flow path unit 17 and a negative pressure is applied to the nozzle surface to perform the cleaning operation. However, such a concern is eliminated by the arrangement of the joints.

  In the flow path member 35, the ink supply needle 14 for receiving ink from the ink cartridge 2 is disposed on one side of the base plate 36 forming the base member, and the flow path portion 37 is disposed on the other side. Therefore, the base plate 36 is caused to function as a basic member for strength, and the ink supply needle 14 disposed on one side and the flow path portion 37 disposed on the other side are present with high support rigidity. Can do. That is, even if the ink cartridge 2 is strongly pressed against the ink supply needle 14, the ink supply needle 14 does not tilt. Further, since the flow path portion 37 is also firmly integrated with the base plate 36, the joining position with the bottom member 15b can be accurately maintained.

  Since the wall plate 15c that prevents the outflow of ink from a part of the bottom member 15b is erected, ink leaks from the attachment portion of the ink supply needle 14 and the joint portion between the flow path portion 37 and the bottom member 15b. Even if it occurs, the wall plate 15c can prevent the ink from flowing out, and ink stains and the like in the peripheral portion do not occur.

  Since the wall plate 15c is arranged between the base plate 36 and the circuit board 18 on which the operation signal circuit of the piezoelectric vibrator 30 is arranged, the ink leaked for some reason is the circuit board 18. Can be prevented by the wall plate 15c, and the recording head 1 having a highly reliable performance with no conduction failure or short circuit of the circuit board 18 can be obtained.

  The circuit board 18 is disposed near the wall plate 15c and along the wall plate 15c. Therefore, since the circuit board 18 is arranged without protruding along the wall plate 15c, the circuit board 18 and the wall plate 15c can be formed in a small space, and the recording head 1 can be made compact.

  Between the wall plate 15 c and the head case 15, a slit 15 d is formed through which the flexible circuit board 19 that sends the signal of the circuit board 18 to the piezoelectric vibrator 30 of the flow path unit 17 is inserted. For this reason, when the flow path unit 17 is joined to the head case 15, the flexible circuit board 19 can be inserted into the slit 15 d first, and then the flexible circuit board 19 can be connected to the circuit board 18. When the path unit 17 is fixed to the head case 15, the flexible circuit board 19 can be connected together and the assembly workability is improved.

  Since the piezoelectric vibrator 30 is in the form of a flexural vibration mode, the piezoelectric vibrator 30 becomes flat, the dimension in the thickness direction of the flow path unit 17 is minimized, and accordingly, the space 15h can be secured large, It becomes easy to arrange the flow path member 35 in the space 15h.

  Each of the above embodiments is directed to an ink jet recording apparatus. However, the liquid ejecting head obtained according to the present invention is not only intended for ink for an ink jet recording apparatus, but includes glue, nail polish, Conductive liquid (liquid metal) or the like can be ejected. Furthermore, in the above-described embodiments, the ink jet recording head using ink that is one of the liquids has been described. However, the colors used for the manufacture of color filters such as recording heads and liquid crystal displays used in image recording apparatuses such as printers. Applied to all liquid ejecting heads for ejecting liquids, such as material ejecting heads, organic EL displays, electrode material ejecting heads used for electrode formation such as FED (surface emitting display), bio-organic ejecting heads used in biochip manufacturing, etc. Is also possible.

  As described above, the flow path member that is a separate part can be secured with good molding quality, and when assembling it to the head case, the flow path portion of the flow path member is placed in the space of the head case. Can be arranged. Therefore, the flow path portion can be arranged at an optimum location for the flow path unit, and an optimal liquid ejecting head as a liquid flow system can be obtained. Such a liquid ejecting head or various devices equipped with the liquid ejecting head can be provided to the market, and high industrial applicability can be expected.

1 is a perspective view of a recording head that is an embodiment of the present invention. FIG. It is the perspective view which looked at the channel member from the channel part side. FIG. 2 is a cross-sectional view of the recording head illustrated in FIG. 1. 1 is a perspective view of an ink jet recording apparatus. It is sectional drawing which shows the part of the recording head and ink cartridge of a prior art example. It is sectional drawing of a flow-path unit. It is a side view which shows the head case of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Recording head, ink ejection apparatus 2 Ink cartridge 3 Carriage 4 Timing belt 5 Stepping motor 6 Guide bar 7 Recording paper 8 Cap 9 Wiper member 10 Frame 11 Storage chamber 12 Ink cartridge fixing lever 13 Ink needle insertion port 14 Ink supply needle 14a Base Base portion 14b Mounting surface 14c Filter 15 Head case 15a Side wall plate 15b Bottom member 15c Wall plate 15d Slit 15e Flow hole 15f Joint surface 15g Open surface 15h Space 16 Ink channel 17 Channel unit 18 Circuit board 19 Flexible circuit board 20a Ink flow Path 20b Raised portion 20c Rib 21 Nozzle opening 22 Nozzle plate 23 Ink storage chamber 24 Flow path forming plate 25 Ink supply port forming plate 26 Pressure generating chamber 27 Pressure generating chamber forming member 28 Pressure generating chamber forming member 29 Pressure Generation chamber forming member, bottom plate 30 Piezoelectric vibrator 31 passage 32 passage 33 passage 34 adhesive 35 flow passage member 36 base plate 37 flow passage portion 37a taper portion 37b pipe portion 37c supply passage 38 seal member 38a through port 39 arrow line 40 arrow line

Claims (10)

  A flow path unit including a nozzle plate in which nozzle openings are arranged, a pressure generation chamber communicating with the nozzle openings and pressurizing liquid by pressure generating means, and a liquid storage chamber storing liquid supplied to the pressure generation chamber Is a liquid ejecting head joined to the head case in a state where a space is formed in the head case, and includes a flow path member provided with a flow path section for supplying a liquid to the liquid storage chamber. The channel member is configured as another member attached to the head case, and the channel portion is present in the space in a state where the channel member is attached to the head case. Jet head.   The liquid ejecting head according to claim 1, wherein a bottom member having a flow hole for guiding the liquid in the flow path portion to the liquid storage chamber is formed at a bottom portion of the head case.   The liquid ejecting head according to claim 2, wherein a seal member is provided between an end portion of the flow path portion and a bottom member.   The liquid jet head according to claim 2, wherein the flow path unit has a flat shape and is joined to an opening end portion of the head case and a part of the bottom member.   5. The flow path member according to claim 1, wherein a liquid supply needle that receives liquid from a liquid storage source is disposed on one side of a base plate that forms the base member, and the flow path portion is disposed on the other side. The liquid ejecting head according to claim 1.   The liquid ejecting head according to claim 2, wherein a wall plate that prevents liquid from flowing out from a part of the bottom member is raised.   The liquid ejecting head according to claim 6, wherein the wall plate is disposed between the base plate and a circuit board on which an operation signal circuit of the pressure generating unit is disposed.   The liquid ejecting head according to claim 7, wherein the circuit board is disposed in a state along the wall plate near the wall plate.   The slit which the flexible circuit board which sends the signal of a circuit board to the pressure generation means of a flow-path unit is penetrated between the said wall board and head case is formed. Liquid jet head.   The liquid ejecting head according to claim 1, wherein the pressure generating unit is a piezoelectric vibrator in a flexural vibration mode.

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