JP2011148165A - Liquid ejection head, liquid ejector, and manufacturing method of liquid ejection head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid ejecting head and a liquid ejecting apparatus capable of efficiently using a filter, and a method for manufacturing the liquid ejecting head.
A liquid ejecting head according to the present invention includes a head main body that ejects liquid supplied from a liquid storage unit via a liquid supply path, and a first liquid supply path that constitutes a part of the liquid supply path. A first supply member, a second liquid supply path that communicates with the first liquid supply path and forms a part of the liquid supply path, a second supply member that supplies liquid to the head body 220, and a first A filter 33 sandwiched between the liquid supply path and the second liquid supply path; and an integrally molded portion for integrally molding and joining the first supply member and the second supply member. A bent portion 39 that is bent so that the filter protrudes toward the first liquid supply path from the surface that holds the filter is provided over the peripheral edge in the supply path.
[Selection] Figure 4

Description

  The present invention relates to a liquid ejecting head, a liquid ejecting apparatus, and a method of manufacturing a liquid ejecting head.

  In an ink jet recording head, which is a typical example of a liquid ejecting head, generally, an ink supply needle serving as an ink supply body that is detachably inserted into an ink cartridge from a liquid storage means filled with ink. Ink is supplied to the head main body through an ink supply 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 main body. The ink supplied to the main body is ejected from the nozzle.

  In such an ink jet recording head, in order to solve a discharge failure such as missing dots due to bubbles or the like, bubbles or dust in the ink is removed between the ink supply needle inserted into the ink cartridge and the cartridge case. A filter provided with a filter is known (for example, see Patent Document 1). The filter and the cartridge case are fixed by thermal welding or the like, and the ink supply needle and the cartridge case are fixed by ultrasonic welding or the like.

JP 2000-2111130 A

  However, in the configuration as in Patent Document 1, a filter, a cartridge case, or the like may be deformed due to heat or the like during welding. In this case, there is a problem that the filter is liable to stick to the inner wall surface of the cartridge case or the like, and air bubbles are likely to accumulate between the twisted filter and the inner wall surface of the cartridge case.

  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 efficiently use a filter, and a method of manufacturing the liquid ejecting head.

  The liquid ejecting head of the present invention includes a head body that ejects the liquid supplied from the liquid storage unit via the liquid supply path, and a first liquid supply path that constitutes a part of the liquid supply path. A second liquid supply path that communicates with the first liquid supply path and forms a part of the liquid supply path, and supplies the liquid to the head body; A filter sandwiched between one liquid supply path and the second liquid supply path; and an integrally molded portion that integrally molds and joins the first supply member and the second supply member. In addition, a bent portion is provided over the periphery of the filter in the liquid supply path so that the filter protrudes closer to the first liquid supply path than the surface holding the filter. And In the present invention, since the filter is provided with the bent portion, the filter protrudes toward the first liquid supply member. Therefore, the distance between the peripheral edge of the filter and the second supply member is widened, and bubbles are not easily collected. In addition, sticking between the filter and the second supply member can be suppressed. Therefore, in the present invention, the filter can be used efficiently.

  The liquid ejecting apparatus according to the aspect of the invention includes the liquid ejecting head in order to efficiently use the filter.

The method for manufacturing a liquid jet head according to the present invention includes a first supply member provided with a first liquid supply path that constitutes a part of the liquid supply path, and the liquid supply path in communication with the first liquid supply path. The first supply member and the second supply member are arranged such that a filter protrudes toward the first supply member side between the second supply member provided with a second liquid supply path constituting a part thereof. And holding the filter in a state of being sandwiched between the first supply member and the second supply member, injecting resin, cooling, and curing the resin to perform integral molding A clamping step comprising: a molding step; and an installation step in which a liquid is supplied from the second supply member via the liquid supply path and the head body for ejecting the supplied liquid is provided in the second liquid supply member. Before the filter, the liquid flow Characterized in that it comprises a bending step of protruded form to one side of the bent bending portion over a position corresponding to the periphery of the.
By bending the filter in advance by a bending process to form a bent portion, a liquid ejecting head that can suppress sticking between the filter and the second supply member can be easily formed.

  Here, as preferable embodiment of this invention, it is mentioned that the said filter protrudes more to the 1st supply member side by the shrinkage | contraction at the time of hardening of the said integral molding process.

1 is a schematic perspective view of a recording apparatus according to Embodiment 1. FIG. FIG. 3 is an exploded perspective view of the recording head according to the first embodiment. 3 is a top view of a supply member according to Embodiment 1. FIG. 3 is a cross-sectional view of a supply member according to Embodiment 1. FIG. It is a schematic diagram for demonstrating the shape of a filter. FIG. 3 is an exploded perspective view showing a head body according to the first embodiment. FIG. 3 is a cross-sectional view showing the head body according to the first embodiment.

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 example of a liquid storage unit in which a plurality of different color inks such as black (B), light black (LB), cyan (C), magenta (M), and yellow (Y) are stored. Each of the ink cartridges 13 is detachably fixed.

  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, so that a recording medium S such as paper fed by a paper feeding device (not shown) 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, in the vicinity of 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.

  As shown in FIG. 2, the recording head 11 includes a plurality of ink supply needles 31 (first supply members) inserted into an ink cartridge 13 that is a liquid storage unit, and a cartridge case 32 (first assembly) to which the ink cartridge 13 is fixed. 2 supply members), a head main body 220 fixed to the surface of the supply member 30 opposite to the ink cartridge 13, and a cover head 240 provided on the liquid ejection surface side of the head main body 220. It has.

  First, the supply member 30 will be described in detail. As shown in FIG. 3 which is a top view of the supply member 30 and FIG. 4 which is a cross-sectional view taken along line AA ′ of FIG. 3, the cartridge case 32 constituting the supply member 30 is a cartridge to which the ink cartridge 13 is mounted. A mounting portion 35 is provided. Further, the cartridge case 32 is formed with a second ink supply path 92 (second liquid supply path) having one end opened to the cartridge mounting portion 35 side and the other end opened to the head main body 220 side. As shown in FIG. 4, the second ink supply path 92 includes a filter chamber 93 having an inner diameter that gradually decreases from the ink supply needle 31 side, and an opening 94 (liquid portion) of the filter chamber 93 on the head body 220 side. It is configured by a communication supply path 99 that communicates with the filter chamber 93 at the supply port) and also communicates with the head body 220.

  An ink supply needle 31 is fixed to the opening of the second ink supply path 92 of the cartridge mounting portion 35 of the cartridge case 32 via a filter 33. The ink supply needle 31 has a first ink supply path 91 (first liquid supply path) having one end opened to the cartridge case 32 side and the other end opened to the ink cartridge 13 side. The first ink supply path 91 has a wide portion 95 whose inner diameter gradually decreases from the cartridge case 32 side. The first ink supply path 91 and the second ink supply path 92 are in communication with each other and constitute a part of an ink supply path (liquid supply path) that connects the ink cartridge 13 and the head body 220.

  The cartridge case 32 and the ink supply needle 31 have a clamping region 38 that is a region for clamping the filter 33. In the present embodiment, the clamping region 38 includes a filter clamping unit 37 provided at an opening edge of the cartridge case 32 on the cartridge mounting unit 35 side of the second ink supply path 92 and a cartridge case 32 side of the ink supply needle 31. It comprises a needle-side filter clamping part 42 provided at the opening edge and facing the filter clamping part 37. The filter clamping portion 37 and the needle-side filter clamping portion 42 constitute a filter clamping surface described later.

  Further, the filter 33 is a sheet-like material in which a plurality of fine holes are formed by finely weaving metal, and is held by a holding region 38 constituted by a filter holding part 37 and a needle side filter holding part 42. Accordingly, the first ink supply path 91 provided in the ink supply needle 31 and the second ink supply path 92 provided in the cartridge case 32 are provided. The filter 33 removes bubbles and foreign matters in the ink. In the present embodiment, the filter 33 is provided with a bent portion 39 which will be described in detail later.

  In the present invention, the supply member 30 includes an integrally molded portion 34 that integrates the cartridge case 32, the ink supply needle 31, and the filter 33. The integral molding unit 34 integrally molds and joins the cartridge case 32 sandwiching the filter 33 and the ink supply needle 31. Here, the integral molding joining means that the cartridge case 32 and the ink supply needle 31 are formed regardless of ultrasonic welding or the like by molding the integral molding portion 34 so as to contact both the cartridge case 32 and the ink supply needle 31. Is to join. In the present embodiment, a wall portion 43 that protrudes from the surface of the cartridge case 32 to which the ink supply needle 31 is fixed is formed, and is formed inside the wall portion 43 by a manufacturing process that will be described later. An integrally molded portion 34 is provided.

  Thus, since the cartridge case 32 and the ink supply needle 31 are integrally molded and joined, the recording head 11 can be reduced in size. More specifically, when the cartridge case 32 and the ink supply needle 31 are not integrally joined, as in the prior art, the filter 33 is welded to the cartridge case 32 by heat welding or the like, and the ink supply needle 31 is further ultrasonicated. It is manufactured by a method of welding by welding or the like. In this case, an area for welding the filter 33 is provided in the cartridge case 32, and an area for welding the ink supply needle 31 is required outside the area. On the other hand, in the present invention, since the cartridge case 32 and the ink supply needle 31 are fixed by the integral molding portion 34, such a region for welding is unnecessary. Thereby, the space | interval of the adjacent ink supply needle | hook 31 can be shortened, and the recording head 11 can be reduced in size. Further, in the present invention, since it is possible to reduce the size of the filter 33, it is not necessary to reduce the area of the filter 33 to reduce the size of the recording head 11. It is not necessary to increase the driving voltage for driving the pressure generating means such as the piezoelectric element 300 or the heating element.

  By the way, when the cartridge case 32 and the ink supply needle 31 are fixed by such an integrally molded portion 34, conventionally, the filter 33 bends due to thermal contraction after the integrally molded joining, and the filter 33 is formed by the filter clamping portion 37 and the needle side filter. A plane including the edge of the filter 33 sandwiched by the sandwiching portion 42 (a sandwiching surface of the filter 33), that is, a joint surface P (hereinafter simply referred to as a joint surface P) between the ink supply needle 31 and the cartridge case 32. As a result, the filter 33 tends to stick to the inner wall surface 96, and the filter 33 and the inner wall surface 96 are too close to each other so that bubbles are likely to accumulate between them.

  Therefore, in the present embodiment, at the periphery of the ink supply path (the first ink supply path 91 and the second ink supply path 92) of the filter 33 so that the central portion of the filter 33 is convex toward the ink supply needle 31 side. Is provided with a bent portion 39. Since the filter 33 is bent at the bent portion 39, the filter 33 protrudes toward the ink supply needle 31 in the ink supply path. Accordingly, it is possible to suppress the filter 33 from sticking to the inner wall surface 96 and to make it difficult for bubbles to accumulate between the filter 33 and the inner wall surface 96. Hereinafter, the bent portion 39 of the filter 33 will be described in detail.

  The bent portion 39 is provided over the periphery of the ink supply path (the first ink supply path 91 and the second ink supply path 92) of the filter 33. Since bubbles easily accumulate around the periphery of the ink supply path, a bent portion 39 is provided along the periphery of the ink supply path, and the distance between the filter 33 and the inner wall surface 96 at the periphery is increased. Air bubbles are less likely to accumulate between

  That is, as shown in FIG. 5, the filter 33 includes a protruding portion 33 </ b> A that is bent and protruded by the bent portion 39, and a flat surface portion 33 </ b> B that is a flat surface. The protruding portion 33A is formed of a curved surface. In the present embodiment, the projecting portion 33A is configured by a dome-shaped curved surface that is substantially arc-shaped in a cross-sectional view. In this way, by being formed of a curved surface, the filter 33 is not easily deformed by the flow of ink flowing from the ink supply needle 31, and sticking between the filter 33 and the inner wall surface 96 can be suppressed. The flat surface portion 33B is a portion that is sandwiched by a sandwiching region 38 that includes the filter sandwiching portion 37 and the needle-side filter sandwiching portion 42. The bent portion 39 has a substantially circular shape in a top view according to the cross-sectional shape of the ink supply path, and the inner diameter of the bent portion 39 is substantially the same as the inner diameter of the ink supply path. Note that the shape of the bent portion 39 in a top view is substantially circular, but is not limited thereto, and may be in accordance with the cross-sectional shape of the ink supply path. For example, if the cross-sectional shape of the ink supply path in a top view is a substantially rectangular shape, it is preferable that the ink supply path has a substantially rectangular shape along with the shape.

  As described above, in the present embodiment, the use of the filter 33 in which the bent portion 39 is formed suppresses sticking of the filter 33 to the inner wall surface 96 and accumulation of bubbles. Here, in order to suppress the accumulation of bubbles, in order to increase the distance between the filter 33 and the inner wall surface 96, it is preferable to provide the filter 33 with a bent portion 39 as in the present embodiment. For example, when the distance between the filter 33 and the inner wall surface 96 is increased by providing the filter with a flat surface and providing the joint surface P closer to the ink supply needle 31 than in the case shown in FIG. There is a possibility that the flow velocity is lowered by being too close to the needle 31 side. Further, if the joint surface P is provided on the ink supply needle 31 side as compared with the case shown in FIG. 4, the configuration of the cartridge case 32 and the ink supply needle 31 must be changed, which increases costs. On the other hand, in the present embodiment, the distance between the filter 33 and the inner wall surface 96 can be increased by changing the configuration of the filter 33 without changing other designs, and the cost is not increased.

  In addition, since the bent portion 39 is formed and the filter 33 protrudes toward the ink supply needle 31 side, the effective area of the filter 33 is large and air bubbles and the like are more easily trapped.

  In the case of integral molding, it cannot be determined from the appearance whether or not the filter 33 is deformed, and in order to grasp the deformation of the filter 33, it is necessary to confirm by destroying the member provided with the filter 33 or the like. However, in this embodiment, since the bent portion 39 is provided in advance in the filter 33 as will be described later, the filter 33 may stick to the inner wall surface 96 by breaking the member provided with the filter 33 or the like. There is no need to check whether or not.

  The above-described ink jet recording head 11, particularly the supply member 30 is manufactured as follows, for example.

  First, the filter 33 is bent at the bent portion 39 to be deformed (bending step). In the present embodiment, when the filter 33 is manufactured by punching with a mold, a bent portion 39 is formed simultaneously with the formation of the filter 33 by using a mold provided with a shape corresponding to the bent portion 39. Thus, the protruding portion 33A and the flat portion 33B are formed. Thus, the bending part 39 can be easily provided by simultaneously producing the bending part 39 when the filter 33 is molded. Of course, after the flat filter 33 is formed by punching, the filter 33 can be bent and protruded at the bent portion 39 by, for example, pressing.

  Between the filter holding portion 37 of the cartridge case 32 and the needle-side filter holding portion 42 of the ink supply needle 31, a filter 33 provided with a bent portion 39 is disposed so as to protrude toward the ink supply needle 31 side. And the ink supply needle 31 hold the filter 33 (holding step). When the filter 33 is attached in a state where the cartridge case 32 is inclined, the filter 33 is held between the cartridge case 32 and the ink supply needle 31 while sucking.

  Next, the cartridge case 32 and the ink supply needle 31 holding the filter 33 are held by a mold, and a space is formed by the mold, the surface of the cartridge case 32, and the inner surface of the wall portion 43, and the space is heated. After the injected resin is injected, it is cooled to cure the resin, thereby forming the integrally molded portion 34 (see FIG. 4) (integrated molding step). In the present embodiment, when the integral molding portion 34 is formed, the filter 33 is caused by a difference in linear expansion coefficient between the cartridge case 32 and the ink supply needle 31, thermal contraction of the resin forming the integral molding portion 34, or the like. As a result, the filter 33 further protrudes toward the ink supply needle 31, so that the filter 33 sticks to the inner wall surface 96 of the cartridge case 32 or between the bent filter 33 and the inner wall surface 96 of the cartridge case 32. Prevents air bubbles from accumulating. That is, before the integral molding, the filter 33 is provided with a bent portion 39 in advance, and the filter 33 is bent so as to protrude toward the ink supply needle 31, whereby stress is applied to the filter 33 and the filter 33 is further supplied with ink. It can be made to protrude toward the needle 31 side. In particular, since the filter 33 is bent by providing the bent portion 39 to the filter 33, the filter 33 is in a state of being tensioned. As a result, the distance between the inner wall surface 96 of the cartridge case 32 and the filter 33 is increased as shown in FIG. 4, so that the filter 33 sticks to the inner wall surface 96 of the cartridge case 32 or is bent. It is possible to suppress the accumulation of bubbles between the two.

  Thereafter, the head body 220 is provided on the supply member 30 via the head case 230 (installation step), and the cover head 240 is attached so as to cover the head body 220, whereby the recording head 11 is formed (see FIG. 2). ).

  A head main body 220 is provided on the side of the supply member 30 opposite to the ink cartridge 13. Here, the head main body 220 will be described with reference to FIGS. 6 and 7. 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, which will be described later, and constitutes a reservoir 100 serving as a common ink chamber for each pressure generation chamber 62. A portion 63 is formed. Further, the communication part 63 is in communication with one end part in the longitudinal direction of each pressure generating chamber 62 via the supply path 64. That is, in the present embodiment, the pressure generation chamber 62, the communication part 63, and the supply path 64 are provided as the liquid channels formed in the channel 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 they communicate with each other on the side opposite to the supply path 64 of each pressure generating chamber 62. 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 first electrode 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 a second electrode made of metal.

  A reservoir forming substrate 80 having a reservoir portion 81 constituting at least a part of the reservoir 100 is joined on the flow path forming substrate 60 on which such a piezoelectric element 300 is formed. In this 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. As described above, the communicating portion of the flow path forming substrate 60 is formed. 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 of the reservoir forming substrate 80 that faces the piezoelectric element 300.

  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. Further, 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 ink supply path of the supply member 30 and supplies 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.

  Each member constituting the head main body 220 is provided with two pin insertion holes 234 into which pins for positioning the respective members are inserted at the time of assembly. Then, the head main body 220 is integrally combined by inserting the pins into the pin insertion hole 234 and joining the members while performing relative positioning of the respective members.

  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 head joint 242 joined to the head.

  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 is configured such that the head joint portion 242 is bonded 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. Even if a suction operation or the like 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. Further, since the head joining portion 242 joined to the liquid ejection surface of the head main body 220 is provided in the cover head 240, the nozzle rows 71A of the plurality of head main bodies 220 are positioned with high accuracy with respect to the cover head 240. Can be joined together.

  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 of this embodiment takes in ink from the ink cartridge 13 via the first ink supply path 91 and the second ink supply path 92, and opens the ink supply communication path 231 and the ink introduction port 144. Then, after filling the interior from the reservoir 100 to the nozzle opening 71 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, and the elastic film 50 and the piezoelectric element 300 are bent and deformed, the pressure in each pressure generating chamber 62 is increased, and ink droplets are ejected from the nozzle openings 71.

(Other embodiments)
As mentioned above, although embodiment of this invention was described, the basic composition of this invention is not limited to what was mentioned above.

  In the above-described embodiment, the filter 33 is sandwiched between the ink supply needle 31 and the cartridge case 32, and then integrally molded and joined by the integral molding portion 34. However, the present invention is not limited to this as long as it is integrally molded and joined. For example, the filter 33 in which the bent portion 39 is formed may be welded to the cartridge case 32, and then the cartridge case 32 to which the filter 33 is welded and the ink supply needle 31 may be integrally molded and joined by the integral molding portion 34. When the filter 33 is welded to the cartridge case 32, the filter 33 may be deformed due to heat or the like. However, in the present invention, the filter 33 is provided with the bent portion 39 in advance, so that the filter 33 Even if the filter 33 is deformed at the time of welding, it is possible to prevent the filter 33 from sticking to the inner wall surface 96 or bubbles from being easily collected.

  Furthermore, in the above-described embodiment, the filter 33 is in the form of a sheet woven with metal, but is not limited thereto. For example, it may be formed by punching a metal plate or a sheet-like material made of a resin having fine holes, but is preferably one that can easily form the bent portion 39.

  In the above-described embodiment, the ink cartridge 13 as the liquid storage unit is provided so as to be detachable from the supply member 30. However, the present invention is not limited to this. For example, an ink tank or the like is recorded as the liquid storage unit. It may be provided at a position different from the 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 the above-described embodiment, the needle-like ink supply needle 31 is exemplified as the first supply member, but the first supply member is not limited to the needle-like one.

  In the above-described embodiment, the configuration in which one head main body 220 is provided for two liquid supply paths has been illustrated, but a plurality of head main bodies may be provided for each ink color. In such a case, each liquid supply path communicates with each head body. That is, each liquid supply path may be provided so as to communicate with each nozzle row in which nozzle openings provided in each head body are arranged in parallel. Of course, the liquid supply path does not have to communicate with each nozzle array, and one liquid supply path may communicate with a plurality of nozzle arrays, and each nozzle array is divided into two, A liquid supply path may be communicated with the liquid. That is, the liquid supply path only needs to communicate with a nozzle opening group including a plurality of nozzle openings.

  Furthermore, 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.

  DESCRIPTION OF SYMBOLS 10 Inkjet recording apparatus (liquid ejecting apparatus), 11 Inkjet recording head (liquid ejecting head), 30 Supply member, 31 Ink supply needle, 32 Cartridge case, 33 Filter, 34 Integrated molding part, 39 Bending part, 91 1st Ink supply path, 92 Second ink supply path, 93 Filter chamber, 94 Opening, 96 Inner wall surface

Claims (4)

A head main body for ejecting the liquid supplied from the liquid storage means via the liquid supply path;
A first supply member provided with a first liquid supply path constituting a part of the liquid supply path;
A second liquid supply path that communicates with the first liquid supply path and forms a part of the liquid supply path; a second supply member that supplies the liquid to the head body;
A filter sandwiched between the first liquid supply path and the second liquid supply path;
An integral molding part for integrally molding and joining the first supply member and the second supply member;
The filter is provided with a bent portion that is bent so that the filter protrudes to the first liquid supply path side from the surface holding the filter over the peripheral edge in the liquid supply path of the filter. A liquid ejecting head characterized by comprising:   A liquid ejecting apparatus comprising the liquid ejecting head according to claim 1. A first supply member provided with a first liquid supply path that constitutes a part of the liquid supply path, and a second liquid supply path that communicates with the first liquid supply path and constitutes a part of the liquid supply path. A clamping step of placing the filter between the first supply member and the second supply member by arranging the filter so as to protrude toward the first supply member between the provided second supply member;
An integral molding step of performing integral molding by holding the filter in a state of being sandwiched between the first supply member and the second supply member, injecting resin, cooling, and curing the resin;
A liquid is supplied from the second supply member via the liquid supply path, and the head main body for ejecting the supplied liquid is provided on the second liquid supply member; and
A liquid ejecting head comprising: a bending step of bending the filter over a position corresponding to a peripheral edge of the liquid flow path to form a bent portion and projecting to one side before the clamping step. Production method. The method of manufacturing a liquid jet head according to claim 3, wherein the filter protrudes further toward the first supply member due to shrinkage during curing in the integral molding step.

Images