JP2009113250A - Liquid jetting head and liquid jetting apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid jetting head and a liquid jetting apparatus which can certainly prevent a liquid from leaking while enabling the head to be miniaturized. <P>SOLUTION: The liquid jetting head is equipped with a feeding member 30 in which a liquid feeding passage 32 for feeding the liquid from a liquid feeding means for each of two or more nozzle openings of a head body is provided, a feeding object 90 which is provided in one end side of the liquid feeding passage 32 of the feeding member 30, and feeds the liquid in the liquid storing means to the feeding member 30, and a filter 40 installed between the feeding member 30 and the feeding object 90. The filter 40 is equipped with a sheet-like filter part 41 and a frame part 42 which was prepared integrally, ranging the outer periphery of the filter region for filtering the liquid of the filter part 41 at least in the surface of the feeding body 90 side of the filter part 41. The feeding member 30 and the feeding body 90 are stuck to the frame part 42 in the region wherein the feeding member 30 and the feeding object 90 are faced each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a liquid ejecting head and a liquid ejecting apparatus that eject liquid, 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 a typical example of a liquid ejecting head, generally, an ink supply needle that is an ink supply body that is detachably inserted from an ink cartridge that is a liquid storage unit filled with ink into the ink cartridge. Ink is supplied to the head body via an ink flow path formed in a supply member such as a cartridge case that holds the ink cartridge, and the head is driven by driving pressure generating means such as a piezoelectric element provided in the head body. The ink supplied to the main body is ejected from the nozzle.

  In such an ink jet recording head, if bubbles that are present in the ink of the ink cartridge or bubbles that are mixed in the ink when the ink cartridge is attached / detached are supplied to the head body, such as dot dropout due to the bubbles. There is a problem that defective discharge occurs. In order to solve such a problem, there is one in which a filter for removing bubbles, dust, etc. in ink is provided between an ink supply needle inserted into an ink cartridge and a supply member (for example, Patent Documents). 1).

  Further, such a filter and the supply member are fixed by heat welding or the like, and the ink supply needle and the supply member are fixed by ultrasonic welding or the like at a position different from the region where the filter and the supply member are fixed. ing.

JP 2000-2111130 A

  However, in the configuration as disclosed in Patent Document 1, an area for individually welding an ink supply needle and a filter that are ink supply bodies is necessary on the supply member, and therefore, the interval between adjacent ink supply needles is shortened. However, there is a problem that the head becomes large.

  Further, the region where the filter is welded to the supply member and the region where the ink supply needle is welded to the supply member are located at the same position, that is, the ink supply needle is placed on the region where the filter and the supply member are fixed. Even if welding is attempted, since the filter is made of metal, non-woven fabric, or the like, there is no resin on the filter, so that welding failure occurs between the filter and the ink supply needle, and ink from the region where welding failure has occurred. There is a problem of leakage.

  Furthermore, if the ink supply needle is to be fixed other than by welding, for example, by adhesion via an adhesive, the adhesive oozes out to the filter, causing problems such as blocking the ink flow by the adhesive. There is a problem.

  In addition, for example, if the area of the filter is excessively reduced in order to reduce the size of the head, the dynamic pressure increases, so that the drive voltage for driving pressure generating means such as a piezoelectric element or a heating element must be increased. There is.

  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 size of the head and reliably prevent liquid leakage.

An aspect of the present invention that solves the above-described problems includes a head body having a nozzle opening that ejects liquid supplied from a liquid storage unit that stores liquid, and a plurality of nozzle opening groups of the head body from the liquid supply unit. A supply member provided with a liquid supply path for supplying the liquid; a supply body provided on one end side of the liquid supply path of the supply member for supplying the liquid in the liquid storage means to the supply member; and the supply A filter provided between a member and the supply body, and the filter filters the liquid of the filter section on a sheet-like filter section and at least the surface of the filter section on the supply body side. A frame portion provided by integral molding over the outer periphery of the filter region, and the supply member and the supply body are fixed to the frame portion in a region where the supply member and the supply body face each other. A liquid-jet head characterized by that.
In this aspect, since the supply member and the supply body can be fixed to the frame portion of the filter in an area where the supply member and the supply body are opposed to each other, an area for individually welding the supply body and the filter to the supply member becomes unnecessary. The effective area can be increased, the interval between adjacent supply bodies can be shortened, and the head can be miniaturized. Further, by providing the filter with a frame portion, it is possible to prevent the adhesive from flowing out to the filter region where the liquid of the filter is filtered even when the adhesive is used. Further, it is not necessary to reduce the area of the filter in order to reduce the size of the head, and it is not necessary to increase the driving voltage for driving the pressure generating means such as the piezoelectric element and the heating element by preventing the dynamic pressure from increasing.

  Here, it is preferable that the frame portion of the filter is provided on both surfaces of the filter portion. According to this, the frame portion of the filter, the supply body, and the supply member can be fixed by any method such as welding or bonding via an adhesive, and the supply member and the supply body are opposed to each other. It can be fixed to the frame of the filter. That is, the frame part of the filter can be bonded to the supply member via an adhesive. In addition, a first protrusion is provided on one surface where the frame portion and the supply member are bonded to each other around the filter region, and the first surface is provided on the other surface. It is preferable that a first groove portion into which the protrusion portion is inserted is provided. According to this, since the bonding area where the frame portion and the supply member are bonded to each other can be widened, the adhesive strength can be improved by the anchor effect, and the liquid from the liquid supply path can block the adhesive interface. It is possible to reliably prevent leakage outside the street.

  Moreover, it is preferable that the said frame part of the said filter is welded with the said supply member. According to this, even if the frame portion is welded to the supply member, the frame portion and the supply body can be fixed by welding or adhesion in a region opposite to the region where the frame portion and the supply member are welded.

  Moreover, it is preferable that the said frame part of the said filter is welded with the said supply body. According to this, a filter and a supply body can be fixed easily and reliably by welding.

  Moreover, it is preferable that the said frame part of the said filter is adhere | attached through the said supply body and the adhesive agent. According to this, a filter and a supply body can be fixed easily and reliably by adhesion via an adhesive. Note that a second protrusion is provided on the one surface where the frame portion and the supply body are bonded to each other around the filter region, and the second surface is provided on the other surface. It is preferable that the 2nd groove part in which this protrusion part is inserted is provided. According to this, since the bonding area where the frame portion and the supply body are bonded to each other can be increased, the adhesive strength can be improved by the anchor effect, and the liquid from the liquid supply path can be used to prevent the adhesive interface. It is possible to reliably prevent leakage outside the street.

  The supply member is provided with a plurality of liquid supply paths, the liquid supply body is provided for each of the plurality of liquid supply paths, and the filter extends over the plurality of liquid supply paths. It is preferable that they are provided continuously. According to this, the number of parts can be reduced, and the process of cutting the filter part and the process of forming the frame part in each filter part by integral molding become unnecessary, and the cost can be reduced.

  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, the liquid ejecting apparatus can be reduced in size.

Hereinafter, the present invention will be described in detail based on embodiments.
(Embodiment 1)
FIG. 1 is a schematic perspective view of an ink jet recording apparatus which is an example of a liquid ejecting apparatus according to Embodiment 1 of the invention. As shown in FIG. 1, the ink jet recording apparatus 10 of the present invention has an ink jet recording head (hereinafter also referred to as a recording head) 11, which is an example of a liquid ejecting head for ejecting ink droplets, fixed to a carriage 12. The recording head 11 is an ink cartridge that is a liquid storage means in which a plurality of different color inks such as black (B), light black (LB), cyan (C), magenta (M), and yellow (Y) are stored. 13 are fixed so that attachment or detachment is possible respectively.

  The carriage 12 on which the recording head 11 is mounted is provided on a carriage shaft 15 attached to the apparatus main body 14 so as to be movable in the axial direction. Then, the driving force of the driving motor 16 is transmitted to the carriage 12 via a plurality of gears and a timing belt 17 (not shown), so that the carriage 12 is moved along the carriage shaft 15. On the other hand, the apparatus main body 14 is provided with a platen 18 along the carriage shaft 15, and a recording medium S such as paper fed by a paper feeding device (not shown) or the like is conveyed on the platen 18. ing.

  A capping device 20 having a cap member 19 that seals the nozzle forming surface of the recording head 11 is provided at a position corresponding to the home position of the carriage 12, that is, near one end of the carriage shaft 15. . The cap member 19 seals the nozzle forming surface on which the nozzle openings are formed, thereby preventing the ink from drying. The cap member 19 also functions as an ink receiver during the flushing operation.

  Here, the recording head 11 according to the present embodiment will be described. FIG. 2 is a schematic perspective view of an ink jet recording head which is an example of the liquid jet head according to the present embodiment, and FIG. 3 is a cross-sectional view of a main part of the ink jet recording head.

  As shown in FIG. 2, the recording head 11 is fixed to a supply member 30 such as a cartridge case to which an ink cartridge 13 as a liquid storage unit is fixed, and a surface of the supply member 30 opposite to the ink cartridge 13. The head main body 220 and the cover head 240 provided on the liquid ejecting surface side of the head main body 220 are provided.

  As shown in FIG. 2, the supply member 30 has a supply body forming portion 31 on which one of the ink cartridges 13 (corresponding to “liquid storage means” described in the claims) is mounted. Of course, the ink supply 13 may not be directly attached to the supply body forming section 31 but the ink may be guided from the liquid storage means to the supply body forming section 31 via a tube.

  Further, as shown in FIG. 3, the supply member 30 has one end opened to each supply body forming portion 31 and the other end opened to the head main body 220 side, and ink from the ink cartridge 13 is supplied to the head main body 220. A liquid supply path 32 for supply is provided. In addition, the liquid supply path 32 is provided in parallel with the longitudinal direction of the supply member 30, and two rows provided in plural are provided. The liquid supply path 32 is provided in the ink cartridge 13 provided for each ink color. In contrast, each is provided independently.

  The supply body forming portion 31 of the supply member 30 is provided with supply needles 90 as supply bodies corresponding to the respective liquid supply paths 32 via the filters 40. The supply needle 90 plays a role of supplying the liquid in the liquid storage means (ink cartridge 13) to the supply member 30.

  The filter 40 includes a sheet-like filter portion 41 and a frame portion 42 that is provided continuously around the periphery of the filter region that filters the ink (liquid) opposite to the liquid supply path 32 of the filter portion 41. It has.

  The filter unit 41 may be, for example, one provided with a plurality of fine holes by finely knitting a metal, or one provided with a fine hole penetrating a metal plate. Of course, the filter unit 41 may be made of a material other than metal, such as resin or nonwoven fabric. Further, a plurality of filter units 41 may be provided independently for each liquid supply path 32, or may be provided continuously over the plurality of liquid supply paths 32. In the present embodiment, one filter unit 41 is provided across all the liquid supply paths 32.

  The frame portion 42 is provided so as to be integrated with at least the surface of the filter portion 41 on the supply needle 90 side. In the present embodiment, the frame portion 42 has the same shape on both surfaces of the filter portion 41. Provided.

  Further, the frame portion 42 is provided with an opening 43 that exposes the filter portion 41 in a region facing the liquid supply path 32 of the filter portion 41, and the filter region of the filter portion 41 is exposed by the opening portion 43. ing.

  Such a frame portion 42 is formed so as to be integrated with the filter portion 41 by integrally molding resin or the like to the filter portion 41. The frame portion 42 formed by integral molding is provided so as to face both surfaces of the filter portion 41, that is, the surface on the supply member 30 side and the surface on the supply needle 90 side. Further, the frame part 42 is integrated between both surfaces of the filter part 41, that is, filled in the fine holes of the filter part 41, so that the frame part 42 is integrated on both surfaces of the filter part 41 and holds the filter part 41.

  In addition, when the filter part 41 is what formed the fine hole by braiding a metal as mentioned above, since resin used as the frame part 42 is filled in the filter part 41 by integral molding. The filter part 41 can be firmly held by the frame part 42. Moreover, in the case of the filter part 41 provided with the fine hole which penetrates a metal plate, since the resin used as a frame part is filled in the fine hole by integral molding, the filter part 41 can be held by the frame part 42. However, by making the outer periphery of the filter part 41 smaller than the outer periphery of the frame part 42, the frame part 42 is integrated in the thickness direction of the filter part 41 outside the filter part 41, and the outer peripheral edge of the filter part 41 Thus, the holding strength of the filter part 41 by the frame part 42 can be improved. Of course, even when the filter part 41 in which fine holes are formed by braiding metal is used, the holding strength can be further improved by making the outer periphery of the filter part 41 smaller than the frame part 42.

  The filter 40 including the filter part 41 and the frame part 42 is fixed by fixing the frame part 42 to the surface of the supply member 30 (supply body forming part 31). In addition, the frame part 42 and the supply member 30 can be fixed by, for example, ultrasonic welding or adhesion via an adhesive. Here, in this embodiment, since the frame part 42 was provided on both surfaces of the filter part 41, the frame part 42 and the supply member 30 can be ultrasonically welded or bonded. For example, even when the frame portion 42 is provided only on the supply needle 90 side of the filter portion 41, the frame portion 42 and the supply member 30 can be welded, but they are bonded via an adhesive. Thus, reliability can be improved.

  The supply needle 90 is provided for each liquid supply path 32 on the surface (supply body forming portion 31) of the supply member 30, and is fixed to the supply member 30 via the filter 40.

  Further, the supply needle 90 includes a through passage 91 communicating with the liquid supply passage 32. Further, a space having a larger inner diameter than other regions, that is, a filter chamber 92 that is a wide portion is provided in a connection region between the supply passageway 90 of the supply needle 90 and the liquid supply passage 32. In this embodiment, for example, the filter chamber 92 is formed so that the inner diameter becomes larger toward the supply member 30 side. The filter chamber 92 is formed with a larger inner diameter than other regions of the through passage 91 in order to increase the area of the filter 40 and reduce the resistance when ink passes through as much as possible.

  Further, the supply needle 90 has a flange portion 93 in the vicinity of the end portion on the supply member 30 side. This flange portion 93 is fixed to the frame portion 42 of the filter 40. That is, the supply needle 90 has a flange portion 93 fixed to a frame portion 42 provided on the supply needle 90 side of the filter portion 41.

  The region where the supply needle 90 is fixed to the filter 40 is a region opposite to the region where the frame portion 42 of the filter 40 and the supply member 30 are fixed. In other words, the supply member 30 and the supply needle 90 are fixed to the frame portion 42 of the filter 40 in regions facing each other.

  The supply needle 90 and the frame portion 42 of the filter 40 can be fixed by, for example, ultrasonic welding or adhesion via an adhesive.

  As described above, the filter 40 includes the sheet-like filter portion 41 that filters ink (liquid) and the frame portion 42 that is integrally formed on the outer periphery of the filter region of the filter portion 41. The frame portion 42, the supply member 30, and the supply needle 90 can be fixed at the same position (regions facing each other) by welding or bonding via an adhesive.

  Since the supply member 30 and the supply needle 90 can be fixed to the frame portion 42 of the filter 40 in regions facing each other, the filter 40 and the supply needle 90 are individually welded to the supply member 30. A region is not required, the interval between adjacent supply needles 90 can be shortened, and the head can be miniaturized.

  Further, the filter 40 is provided with a frame portion 42 formed by integral molding, and the supply member 30 and the supply needle 90 can be fixed to the frame portion 42 by welding. It is possible to reliably prevent leakage. In addition, when the supply member 30 and the supply needle 90 are fixed to the frame portion 42 of the filter 40 by a method other than welding, for example, adhesion through an adhesive, the adhesive is moved from the frame portion 42 to the filter portion 41 side. It is difficult to flow out, and it is possible to reliably prevent inhibition of the ink flow due to the adhesive oozing out into the filter portion 41.

  Furthermore, it is not necessary to reduce the area of the filter in order to reduce the size of the head, and the increase in dynamic pressure due to insufficient filter area is prevented, and the drive voltage for driving pressure generating means such as a piezoelectric element and a heating element is increased. There is no need.

  Here, a fixing method of the supply member 30, the filter 40, and the supply needle 90 of the present embodiment will be described. 4 and 5 are cross-sectional views illustrating a method for manufacturing an ink jet recording head which is an example of the liquid ejecting head according to the present embodiment.

  First, as shown in FIG. 4A, the filter 40 is brought into contact with the surface of the supply member 30 where the liquid supply path 32 is open.

  As described above, the filter 40 is integrated by integrally forming the frame portion 42 with the filter portion 41, and the first welding protrusion 44 is provided in advance when the frame portion 42 is integrally formed. It has been.

  Next, as shown in FIG. 4B, the frame portion 42 of the filter 40 and the supply member 30 are fixed by irradiating and melting the first welding projection 44 of the frame portion 42 with ultrasonic waves. That is, the frame portion 42 of the filter 40 and the supply member 30 are fixed by ultrasonic welding.

  Next, as shown in FIG. 5A, the supply needle 90 is brought into contact with the frame portion 42 of the filter 40. The supply needle 90 can be formed by, for example, insert molding or the like, and a second welding projection 94 is provided on a surface fixed to the frame portion 42 of the flange portion 93.

  Then, as shown in FIG. 5B, the frame portion 42 of the filter 40 and the supply needle 90 are fixed by irradiating and melting the second welding projection 94 of the supply needle 90 with ultrasonic waves. That is, the frame portion 42 of the filter 40 and the supply needle 90 are fixed by ultrasonic welding. Thereby, the supply member 30, the filter 40, and the supply needle 90 are assembled.

  As described above, in the present embodiment, as the filter 40, the sheet-like filter part 41 that actually filters ink (liquid) and the frame part 42 provided on the outer periphery of the filter region of the filter part 41 are used. The supply member 30 and the supply needle 90 can be fixed to the opposing regions of the frame portion 42 of the filter 40 by welding.

  In the present embodiment, the first welding protrusion 44 that is melted when the supply member 30 is welded to the frame portion 42 of the filter 40 is provided. However, the present invention is not particularly limited thereto. A first welding projection may be provided on the first. In other words, it is only necessary that the first welding projection 44 is provided on one surface where the frame portion 42 of the filter 40 and the supply member 30 are welded to each other. Similarly, in the present embodiment, the second welding protrusion 94 is provided on the supply needle 90. However, the present invention is not particularly limited thereto. For example, the second welding protrusion is provided on the frame portion 42 of the filter 40. May be. In other words, it is only necessary that the second welding projection is provided on either surface where the frame portion 42 of the filter 40 and the supply member 30 are welded to each other.

  In this way, the first welding projection 44 and the second welding projection 94 are provided, and the first welding projection 44 and the second welding projection 94 are melted to weld the supply member 30, the filter 40, and the supply needle 90. By fixing by this, strength can be improved and the occurrence of poor welding can be surely prevented.

  Incidentally, in this embodiment, the first welding projection 44 and the second welding projection 94 are provided, but the present invention is not limited to this, and the first welding projection 44 and the second welding projection 94 are provided. Even if not, the supply member 30, the filter 40, and the supply needle 90 can be fixed by welding.

  A head body 220 is provided on the other side of the liquid supply path 32 of the supply member 30, that is, on the side opposite to the supply needle 90. Here, the head body 220 will be described. FIG. 6 is an exploded perspective view of the head body, and FIG. 7 is a cross-sectional view of the head body.

  As shown in the figure, the flow path forming substrate 60 constituting the head main body 220 is made of a silicon single crystal substrate in the present embodiment, and an elastic film 50 made of silicon dioxide is formed on one surface thereof. The flow path forming substrate 60 is formed with two rows in which pressure generation chambers 62 partitioned by a plurality of partition walls are arranged in parallel in the width direction by anisotropic etching from the other side. Further, on the outer side in the longitudinal direction of the pressure generation chambers 62 in each row, communication is made with a reservoir portion 81 provided on a reservoir forming substrate 80 described later, and constitutes a reservoir 100 serving as a common ink chamber for each pressure generation chamber 62. A portion 63 is formed. The communication portion 63 is in communication with one end portion in the longitudinal direction of each pressure generating chamber 62 through the ink supply path 64. That is, in the present embodiment, the pressure generation chamber 62, the communication part 63, and the ink supply path 64 are provided as liquid supply paths formed on the flow path forming substrate 60.

  Further, the nozzle plate 70 in which the nozzle openings 71 are formed is fixed to the opening surface side of the flow path forming substrate 60 via the adhesive 400. Specifically, a plurality of nozzle plates 70 are provided so as to correspond to the plurality of head main bodies 220, and the nozzle plates 70 have a slightly larger area than an exposed opening 241 of the cover head 240 described in detail later. And is fixed by an adhesive or the like in a region overlapping with the cover head 240. In addition, the nozzle openings 71 of the nozzle plate 70 are formed at positions where the pressure generating chambers 62 communicate with each other on the side opposite to the ink supply path 64. In this embodiment, since two rows in which the pressure generating chambers 62 are arranged in parallel are provided on the flow path forming substrate 60, two nozzle rows 71A in which nozzle openings 71 are arranged in parallel are provided in one head body 220. Yes. In the present embodiment, the surface of the nozzle plate 70 where the nozzle openings 71 are open is the liquid ejection surface. Examples of such a nozzle plate 70 include a silicon single crystal substrate and a metal substrate such as stainless steel (SUS).

  On the other hand, on the side opposite to the opening surface of the flow path forming substrate 60, on the elastic film 50, a lower electrode film made of metal, a piezoelectric layer made of a piezoelectric material such as lead zirconate titanate (PZT), A piezoelectric element 300 is formed by sequentially laminating an upper electrode film made of metal.

  On the flow path forming substrate 60 on which such a piezoelectric element 300 is formed, a reservoir forming substrate 80 having a reservoir portion 81 that constitutes at least a part of the reservoir 100 is joined. In the present embodiment, the reservoir portion 81 is formed across the reservoir forming substrate 80 in the thickness direction and across the width direction of the pressure generating chamber 62, and as described above, the communication portion of the flow path forming substrate 60. The reservoir 100 is connected to the pressure generating chamber 62 and serves as a common ink chamber.

  A piezoelectric element holding portion 82 having a space that does not hinder the movement of the piezoelectric element 300 is provided in a region facing the piezoelectric element 300 of the reservoir forming substrate 80.

  Further, on the reservoir forming substrate 80, a drive circuit 110 made of a semiconductor integrated circuit (IC) or the like for driving each piezoelectric element 300 is provided. Each terminal of the drive circuit 110 is connected to a lead wiring drawn from the individual electrode of each piezoelectric element 300 via a bonding wire or the like (not shown). Each terminal of the drive circuit 110 is connected to the outside via an external wiring 111 such as a flexible printed circuit (FPC), and receives various signals such as a print signal from the outside via the external wiring 111. Yes.

  In addition, the compliance substrate 140 is bonded onto the reservoir forming substrate 80. An ink introduction port 144 for supplying ink to the reservoir 100 is formed in a region facing the reservoir 100 of the compliance substrate 140 by penetrating in the thickness direction. In addition, the region other than the ink inlet 144 in the region facing the reservoir 100 of the compliance substrate 140 is a flexible portion 143 formed thin in the thickness direction, and the reservoir 100 is sealed by the flexible portion 143. Has been. This flexible portion 143 provides compliance within the reservoir 100.

  A head case 230 is fixed on the compliance substrate 140.

  The head case 230 is provided with an ink supply communication path 231 that communicates with the ink introduction port 144 and also communicates with the liquid supply path 32 of the supply member 30 to supply ink from the supply member 30 to the ink introduction port 144. . In the head case 230, a groove portion 232 is formed in a region facing the flexible portion 143 of the compliance substrate 140, and the flexible portion 143 is appropriately deformed. The head case 230 is provided with a drive circuit holding portion 233 penetrating in the thickness direction in a region facing the drive circuit 110 provided on the reservoir forming substrate 80, and the external wiring 111 holds the drive circuit holding The drive circuit 110 is connected through the portion 233.

  Further, as shown in FIG. 2, the head main body 220 held by the supply member 30 via the head case 230 is relative to each other by a cover head 240 having a box shape so as to cover the liquid ejection surface side of the five head main bodies 220. Positioned and held. The cover head 240 has an exposed opening 241 that exposes the nozzle opening 71, an exposed opening 241, and both ends of the nozzle openings 71 arranged in parallel in at least the nozzle row 71 </ b> A on the liquid ejection surface of the head body 220. And a joint portion 242 to be joined.

  In the present embodiment, the joint portion 242 extends between the frame portion 243 provided along the outer periphery of the liquid ejecting surface across the plurality of head main bodies 220 and the adjacent head main body 220 to be exposed opening portions 241. The frame portion 243 and the beam portion 244 are joined to the liquid ejecting surface of the head main body 220, that is, the surface of the nozzle plate 70.

  Further, the cover head 240 is provided with a side wall portion 245 that extends so as to bend over the outer peripheral edge portion of the liquid ejection surface on the side surface side of the liquid ejection surface of the head body 220.

  As described above, the cover head 240 adheres the joint portion 242 to the liquid ejecting surface of the head main body 220. Therefore, the step between the liquid ejecting surface and the cover head 240 can be reduced, and the liquid ejecting surface can be wiped or sucked. Even if the operation is performed, it is possible to prevent ink from remaining on the liquid ejection surface. Further, since the adjacent head main bodies 220 are blocked by the beam portions 244, ink does not enter between the adjacent head main bodies 220, and deterioration due to ink such as the piezoelectric element 300 and the drive circuit 110 and the like. Destruction can be prevented. Further, since the liquid ejection surface of the head main body 220 and the cover head 240 are bonded without any gap by an adhesive, the recording medium S is prevented from entering the gap, and the cover head 240 is deformed and paper jam occurs. Can be prevented. Further, since the side wall 245 covers the outer peripheral edge portions of the plurality of head main bodies 220, it is possible to reliably prevent the ink from flowing into the side surfaces of the head main bodies 220. In addition, since the cover head 240 is provided with the joint portion 242 that is joined to the liquid ejecting surface of the head main body 220, each nozzle row 71A of the plurality of head main bodies 220 is positioned with high accuracy with respect to the cover head 240. Can be joined.

  As such a cover head 240, metal materials, such as stainless steel, are mentioned, for example, A metal plate may be formed by press work and may be formed by shaping | molding. Further, the cover head 240 can be grounded by using a conductive metal material. The joining of the cover head 240 and the nozzle plate 70 is not particularly limited, and examples thereof include adhesion using a thermosetting epoxy adhesive or an ultraviolet curable adhesive.

  The ink jet recording head 11 according to this embodiment takes in ink from the ink cartridge 13 from the liquid supply path 32 and reaches the nozzle opening 71 from the reservoir 100 through the ink supply communication path 231 and the ink introduction port 144. After filling the inside with ink, a voltage is applied to each piezoelectric element 300 corresponding to each pressure generating chamber 62 in accordance with a recording signal from the drive circuit 110 to cause the elastic film 50 and the piezoelectric element 300 to bend and deform. The pressure in each pressure generating chamber 62 increases and ink droplets are ejected from the nozzle openings 71.

(Embodiment 2)
FIG. 8 is a cross-sectional view of a main part of an ink jet recording head which is an example of a liquid jet head according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to the member similar to Embodiment 1 mentioned above, and the overlapping description is abbreviate | omitted.

  As shown in FIG. 8, the filter 40 </ b> A includes a sheet-like filter portion 41 similar to that of the first embodiment described above, and a frame portion 42 </ b> A provided on the outer periphery of the filter region of the filter portion 41.

  42 A of frame parts are provided in both surfaces of the filter part 41 similarly to Embodiment 1 mentioned above. The frame portion 42A is provided with a first protrusion 45 that protrudes toward the supply member 30A and a second protrusion 46 that protrudes toward the supply needle 90. The first protrusion 45 and the second protrusion 46 are continuously provided around the filter area of the filter portion 41.

  The supply member 30A is provided with a first groove 33 into which the first protrusion 45 of the filter 40A is inserted in a region where the filter 40A is fixed.

  The supply needle 90 </ b> A is provided with a second groove portion 95 into which the second protrusion 46 of the filter 40 </ b> A is inserted in a region where the filter 40 </ b> A of the flange portion 93 is fixed.

  In this embodiment, the supply member 30A and the filter 40A are bonded via an adhesive 200, and the filter 40A and the supply needle 90A are bonded via an adhesive 201. The adhesive 200 is filled in the gap between the first protrusion 45 and the first groove 33, and bonds the supply member 30A and the filter 40A. Similarly, the adhesive 201 is filled in the gap between the second protrusion 46 and the second groove 95 to bond the filter 40A and the supply needle 90A.

  The supply member 30A and the supply needle 90A are bonded to the frame portion 42A of the filter 40A via adhesives 200 and 201 in regions facing each other.

  As described above, the filter 40A includes the sheet-like filter portion 41 that filters ink (liquid) and the frame portion 42A that is integrally formed on the outer periphery of the filter region of the filter portion 41. The frame portion 42A, the supply member 30A, and the supply needle 90A can be fixed by bonding via the adhesives 200 and 201 at the same position (regions facing each other).

  Then, since the supply member 30A and the supply needle 90A can be bonded to the frame portion 42A of the filter 40A in regions facing each other, the filter 40A and the supply needle 90A are individually bonded to the supply member 30A. A region is not required, the interval between adjacent supply needles 90A can be shortened, and the head can be miniaturized.

  Further, since the filter 42A is provided with a frame portion 42A formed by integral molding, and the supply member 30A and the supply needle 90A can be bonded to the frame portion 42A, the adhesives 200 and 201 are applied to the filter portion from above the frame portion 42A. Inhibiting the flow of ink due to the adhesives 200 and 201 oozing out into the filter part 41 can be reliably prevented.

  Furthermore, it is not necessary to reduce the area of the filter in order to reduce the size of the head, and the increase in dynamic pressure due to insufficient filter area is prevented, and the drive voltage for driving pressure generating means such as a piezoelectric element and a heating element is increased. There is no need.

  Further, in the present embodiment, the first protrusion 45 and the second protrusion 46 are provided on the frame part 42A of the filter 40A, and the first protrusion 45 and the second protrusion 46A are respectively provided on the supply member 30A and the supply needle 90A. The first groove portion 33 and the second groove portion 95 into which the protrusion portion 46 is inserted are provided, and the supply member 30A, the filter 40A, and the supply needle 90A are provided between the first protrusion portion 45 and the first groove portion 33. Since the second protrusion 46 and the second groove 95 are bonded by the adhesives 200 and 201, the bonding area can be widened, and the bonding strength can be improved by the anchor effect. The ink passing through the liquid supply path 32 can be prevented from leaking outside from the interface between the adhesives 200 and 201, and the reliability can be improved.

  Of course, even if the first protrusion 45, the second protrusion 46, the first groove 33, and the second groove 95 are not provided, the supply member 30A, the filter 40A, and the supply needle 90A can be bonded to the adhesives 200 and 201. Can be adhered to each other.

  In the present embodiment, the first protrusion 45 and the second protrusion 46 are provided on the frame 42A of the filter 40A, the first groove 33 is provided on the supply member 30A, and the second groove is provided on the supply needle 90. 95 is provided, but the present invention is not particularly limited to this, and the first groove portion and the second groove portion are provided in the frame portion 42A of the filter 40A, the first protrusion is provided in the supply member 30A, and the supply needle 90A is provided. A second protrusion may be provided. That is, the first protrusion is provided around the periphery of the filter region on one surface where the frame portion 42A of the filter 40A and the supply member 30A are bonded to each other, and the first surface is provided on the other surface. The 1st groove part in which one projection part is inserted should just be provided. Similarly, on one surface where the frame portion 42A of the filter 40A and the supply needle 90A are bonded to each other, a second protrusion is provided around the filter region, and on the other surface, It is only necessary to provide a second groove into which the second protrusion is inserted.

(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 and second embodiments described above, the sheet-like filter portions 41 and 41A and the frame portions 42 and 42A provided on both surfaces of the filter portions 41 and 41A are provided as the filters 40 and 40A. The frame portions 42 and 42A may be provided at least on the surface of the filter portion 41 on the supply needle 90 or 90A side. As described above, when the frame portion is provided only on the supply needles 90 and 90A side of the filter portion 41, the frame portion and the supply members 30 and 30A may be fixed by welding, and the frame portion and the supply needles 90 and 90A are fixed. Can be fixed by welding or bonding via an adhesive. In other words, even when the frame portion is provided only on the supply needles 90 and 90A side, the frame portion and the supply needles 90 and 90A are arranged in regions opposite to the fixing region between the frame portion and the supply members 30 and 30A. It can be fixed.

  In the first and second embodiments described above, the configuration in which the supply needles 90 and 90A are provided independently for each liquid supply path 32 is disclosed. However, the present invention is not particularly limited thereto. Alternatively, a plurality of integrated members may be used.

  Furthermore, in the first and second embodiments described above, one filter portion 41 is provided for the plurality of liquid supply paths 32, and the frame portions 42 and 42A provided integrally with the filter portion 41 are provided. For example, the filter 40 in which the filter part 41 and the frame parts 42 and 42A are integrated may be individually provided for each liquid supply path 32. Note that, as in the first and second embodiments described above, one filter unit 41 is provided for the plurality of liquid supply paths 32, and frame units 42 and 42A provided integrally with the filter unit 41 are provided. By doing so, the number of parts can be reduced, and the process of cutting the sheet-like filter part 41 and the process of individually forming the frame parts 42 and 42A become unnecessary, and the cost can be reduced.

  In the first embodiment described above, the ink cartridge 13 that is a liquid storage unit is provided so as to be detachable from the supply member 30. However, the present invention is not particularly limited thereto. Etc. may be provided at a position different from the recording head 11, and the liquid storage means and the recording head 11 may be connected via a supply pipe such as a tube. That is, in Embodiment 1 mentioned above, the needle-shaped supply needles 90 and 90A were illustrated as a supply body, However, A supply body is not limited to a needle-shaped thing.

  Furthermore, in the first embodiment described above, the configuration in which the five head main bodies 220 are provided for the plurality of liquid supply paths 32 is exemplified, but one head main body 220 is provided with three or more nozzle rows. Alternatively, one nozzle row may be provided in one head main body 220. In any case, each liquid supply path 32 may be communicated with each nozzle row. Of course, the liquid supply path 32 may not communicate with each nozzle array, and one liquid supply path 32 may communicate with a plurality of nozzle arrays, and one nozzle array is divided into two. The liquid supply path 32 may be communicated with each other. That is, the liquid supply path 32 only needs to communicate with a nozzle opening group including a plurality of nozzle openings.

  Further, in the above-described embodiment, the present invention has been described by exemplifying the ink jet recording head 11 that ejects ink droplets. However, the present invention is widely intended for all liquid ejecting heads. Examples of the liquid ejecting head include a recording head used for an image recording apparatus such as a printer, a color material ejecting head used for manufacturing a color filter such as a liquid crystal display, an organic EL display, and an electrode formation such as an FED (field emission display). Electrode material ejecting heads used in manufacturing, bioorganic matter ejecting heads used in biochip production, and the like.

1 is a schematic perspective view of a recording apparatus according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view of a recording head according to Embodiment 1 of the invention. FIG. 2 is a cross-sectional view of a main part of the recording head according to Embodiment 1 of the invention. FIG. 5 is a cross-sectional view illustrating the recording head manufacturing method according to the first embodiment of the invention. FIG. 5 is a cross-sectional view illustrating the method for manufacturing the recording head according to the first embodiment of the invention. It is a disassembled perspective view which shows the head main body which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the head main body which concerns on Embodiment 1 of this invention. FIG. 6 is a cross-sectional view of a main part of a recording head according to Embodiment 2 of the invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Inkjet recording apparatus (liquid ejecting apparatus), 11 Inkjet recording head (liquid ejecting head), 30, 30A supply member, 40, 40A filter, 41 Filter part 41, 42A Frame part, 90, 90A Supply needle (supply body) ), 220 head body, 240 cover head

Claims (10)

A head main body having a nozzle opening for ejecting liquid supplied from a liquid storage means for storing liquid, and a liquid supply path for supplying the liquid from the liquid supply means for each of a plurality of nozzle opening groups of the head main body are provided. A supply member that is provided on one end side of the liquid supply path of the supply member and supplies the liquid in the liquid storage means to the supply member, and is provided between the supply member and the supply member. A filter,
The filter includes a sheet-like filter portion, and a frame portion provided by integral molding on an outer periphery of a filter region for filtering the liquid of the filter portion on at least the surface of the filter portion on the supply body side. And
The liquid ejecting head, wherein the supply member and the supply body are fixed to the frame portion in a region where the supply member and the supply body face each other.   The liquid ejecting head according to claim 1, wherein the frame portion of the filter is provided on both surfaces of the filter portion.   The liquid ejecting head according to claim 2, wherein the frame portion of the filter is bonded to the supply member via an adhesive.   The first protrusion is provided on one surface where the frame portion and the supply member are bonded to each other around the filter region, and the first protrusion is formed on the other surface. The liquid ejecting head according to claim 3, wherein a first groove portion into which the portion is inserted is provided.   The liquid ejecting head according to claim 1, wherein the frame portion of the filter is welded to the supply member.   The liquid ejecting head according to claim 1, wherein the frame portion of the filter is welded to the supply body.   The liquid ejecting head according to claim 1, wherein the frame portion of the filter is bonded to the supply body via an adhesive.   A second protrusion is provided on one surface where the frame and the supply body are bonded to each other around the filter region, and the second protrusion is formed on the other surface. The liquid ejecting head according to claim 7, wherein a second groove portion into which the portion is inserted is provided.   The supply member is provided with a plurality of liquid supply paths, the liquid supply body is provided for each of the plurality of liquid supply paths, and the filter is continuous over the plurality of liquid supply paths. The liquid ejecting head according to claim 1, wherein the liquid ejecting head is provided.   A liquid ejecting apparatus comprising the liquid ejecting head according to claim 1.