JP2012218255A - Liquid jetting head and liquid jetting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid jetting head and a liquid jetting apparatus which can prevent liquid adhesion to a fixing member by surely joining the fixing member and a liquid jetting surface.SOLUTION: The liquid jetting head includes a head body 220 which has the liquid jetting surface A with an opening of a nozzle 21 formed thereon for jetting an ink and a cover head 240 which is fixed to the head body 220 and has an exposing opening part 241 where the nozzle 21 is exposed. A step 24 dented more than the liquid jetting surface A in an opposite direction to a direction for the ink to be ejected is prepared at an edge part of the liquid jetting surface A of the head body 220. A joining part 242 of the cover head 240 is joined to the step 24 of the head body 220. A liquid repellent tape 25 having liquid repellency to the ink is provided continuously from a surface of the cover head 240 to a part of the liquid jetting surface A.

Description

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

  Examples of the ink jet recording head that ejects ink as liquid include a nozzle plate having a liquid ejecting surface in which a nozzle that ejects ink opens, and a fixed plate that is fixed to the liquid ejecting surface of the nozzle plate via an adhesive. (For example, refer patent document 1).

  When a part of the ejected ink adheres to the fixing member and solidifies, it becomes a protrusion protruding from the fixing member. The protrusions come into contact with a print medium such as paper and cause problems such as rubbing the paper surface.

  In order to prevent such problems, an ink jet recording head in which a liquid repellent film is provided on a fixed plate has been proposed (see, for example, Patent Document 2). For example, the liquid repellent film is provided on the entire surface of the fixing member by immersing the fixing member in a solution having liquid repellency. By providing the liquid-repellent film on the fixing member, it is possible to prevent the ink from adhering to the fixing member, and to prevent a protrusion that has solidified the ink from being generated.

  Further, an ink jet recording head in which a metal cover is used as a fixing member and the cover and the nozzle plate are joined via a conductive member having a protrusion and a conductive adhesive has been proposed (for example, Patent Document 3). reference).

Japanese Patent Laying-Open No. 2005-096419 JP 2008-221653 A JP 2009-196328 A

  When the liquid repellent film is formed on the entire surface of the fixing member, the liquid repellent film is formed up to the joint surface with the nozzle plate. For this reason, even if the fixing member is bonded to the nozzle plate with an adhesive or the like, the adhesive force is weak and poor bonding occurs.

  On the other hand, it is possible to provide a mask on the joint surface of the fixing member with the nozzle plate and not provide a liquid repellent film on the joint surface with the nozzle plate. However, a step of attaching a mask to selectively provide a liquid repellent film on the fixing member is required. In such a process, precision is required for the work of attaching the mask, which takes time and cost. Furthermore, when the mask is repeatedly applied and peeled, the fixing member may be deformed. If the fixing member is deformed, the position of the head main body attached to the fixing member will vary.

  In addition, when a conductive member having a protrusion is interposed in the joint between the fixing member and the nozzle plate, there is a problem that the nozzle plate may be broken due to the protrusion.

  SUMMARY An advantage of some aspects of the invention is that it provides a liquid ejecting head and a liquid ejecting apparatus that can reliably bond a fixing member and a liquid ejecting surface to each other and prevent adhesion of liquid to the fixing member. To do.

An aspect of the present invention that solves the above problem includes a head main body having a liquid ejection surface provided with a nozzle for ejecting liquid, and a fixing member that is fixed to the head main body and has an exposed opening through which the nozzle is exposed. The edge of the liquid ejecting surface of the head body is provided with a step that is recessed from the liquid ejecting surface in a direction opposite to the direction in which the liquid is ejected, and the fixing member is provided on the step of the head body. A liquid ejecting head, wherein a liquid repellent member bonded and having liquid repellency to the liquid is continuously provided from at least a part of the surface of the fixing member to a part of the liquid ejecting surface. It is in.
In this aspect, the surface of the fixing member on which the liquid may adhere can be reliably protected with the liquid repellent member. That is, it is possible to prevent the protrusions that are solidified due to the liquid adhering to the fixing member. This prevents the protrusions from coming into contact with a print medium such as paper and rubbing the surface of the print medium.
Further, it is not necessary to provide a liquid repellent film on the entire surface of the fixing member as in the prior art. Accordingly, when the fixing member and the liquid ejecting surface are bonded with an adhesive, the adhesive force is not reduced, so that the fixing member and the liquid ejecting surface can be reliably bonded. Further, as in the prior art, the labor and cost for selectively forming the liquid repellent film on the surface of the fixing member are not required.
Furthermore, by providing a step at the edge of the liquid ejecting surface and joining the fixing member to the step, the surface of the fixing member and the liquid ejecting surface can be substantially flush with each other. As a result, the liquid repellent member can be affixed in a planar manner to the fixing member and the liquid ejection surface that are flush with each other. Therefore, the liquid repellent member is difficult to peel from the fixing member and the liquid ejection surface.

  Here, it is preferable that the fixing member is metal-bonded to the step of the head body. Thereby, a liquid repellent member can be reliably joined by a fixing member and a liquid ejection surface.

  Further, the liquid ejecting surface has a liquid repellent region and a non-liquid repellent region provided with a liquid repellent film, and the liquid repellent member extends from at least a part of the surface of the fixing member to the liquid ejecting surface. It is preferable that the non-liquid repellent region is continuously provided. As a result, the liquid repellent member is joined to the non-liquid repellent area having no liquid repellency, so that the liquid repellent member can be more reliably joined.

According to another aspect of the invention, there is provided a liquid ejecting apparatus including the liquid ejecting head according to the above aspect.
In this aspect, it is possible to realize a liquid ejecting apparatus that can reliably bond the fixing member and the liquid ejecting surface and prevent the liquid from adhering to the fixing member.

FIG. 2 is an exploded perspective view of a recording head according to an embodiment. FIG. 3 is an assembled perspective view of a recording head according to an embodiment. It is a disassembled perspective view of the head main body which concerns on one Embodiment. FIG. 3 is a cross-sectional view of a main part of a recording head according to an embodiment. FIG. 3 is an enlarged cross-sectional view of a main part of a recording head according to an embodiment. FIG. 3 is an enlarged cross-sectional view of a main part of a recording head according to an embodiment. 1 is a schematic diagram illustrating an ink jet recording apparatus according to an embodiment.

  Hereinafter, the present invention will be described in detail based on embodiments. Hereinafter, the ink jet recording head is an example of a liquid ejecting head, and is also simply referred to as a recording head.

  FIG. 1 is an exploded perspective view of a recording head according to the embodiment, and FIG. 2 is an assembled perspective view of the recording head.

  As shown in FIG. 1, the cartridge case 210 constituting the recording head 1 has a cartridge mounting portion 211 to which an ink cartridge (not shown) as an ink supply means is mounted. For example, in this embodiment, the ink cartridge is configured as a separate body filled with black and three color inks, and the ink cartridges of the respective colors are mounted in the cartridge case 210. In addition, the cartridge case 210 is provided with an ink communication path (not shown) serving as an ink flow path. The ink communication path has one end opened to each cartridge mounting portion 211 and the other end opened to the head case 230 side. A filter (not shown) for removing bubbles and foreign matters in the ink is provided in the ink communication path. Furthermore, an ink supply needle 213 that is inserted into the ink supply port of the ink cartridge and that is connected to the opening of the ink communication path is fixed to the cartridge mounting portion 211.

  A head case 230 to which the head main body 220 is fixed is provided on the bottom surface side of the cartridge case 210 (the side opposite to the cartridge mounting portion 211).

  A plurality of head main bodies 220 are provided corresponding to the ink colors, and each head main body 220 discharges ink of each color of the ink cartridge. The detailed configuration of the head main body 220 will be described later. A head case 230 is also provided independently for each head body 220.

  The recording head 1 also includes a cover head 240 that is an example of a fixing member that holds a plurality of head main bodies 220. The cover head 240 has a box shape and is made of a metal material. Specifically, the cover head 240 includes a joint portion 242 that forms a box-shaped bottom surface.

  The joint portion 242 includes a flat frame portion 243 having an opening in the center portion and a beam portion 244 that divides the opening of the frame portion 243. The opening of the frame portion 243 divided by each beam portion 244 is referred to as an exposed opening portion 241. The nozzle 21 of each head body 220 joined to the joint 242 is exposed to the exposed opening 241, and a part of the surface of the nozzle plate 20 of the head body 220 is joined to the frame part 243 and the beam part 244. ing. Details of a joint portion between the nozzle plate 20 of the head main body 220 and the joint portion 242 (cover head 240) will be described later.

  Further, the cover head 240 is provided with a bent side wall portion 245 that is continuous with the joint portion 242 and is provided on the side surface side (side surface side continuous with the nozzle plate 20) of the head main body 220. Further, the side wall portion 245 is provided with a flange portion 246 projecting sideways, and the flange portion 246 is provided with a fixing hole 247 penetrating in the thickness direction. The fixing hole 247 is inserted with a protrusion 215 provided in the cartridge case 210. The protrusion 215 is inserted into the fixing hole 247 and the tip of the protrusion 215 is caulked by heating, so that the cover head 240 is positioned and fixed to the cartridge case 210.

  FIG. 3 is an exploded perspective view of the head main body and the head case, and FIG. 4 is a cross-sectional view of the head main body, the head case, and the cover head. As shown in FIGS. 3 and 4, the flow path forming substrate 10 constituting the head body 220 is made of a silicon single crystal substrate in this embodiment, and one surface thereof is made of silicon dioxide previously formed by thermal oxidation. An elastic film 50 is formed. The flow path forming substrate 10 is formed with a plurality of pressure generating chambers 12 partitioned by a plurality of partition walls by anisotropic etching from the other side. The pressure generation chambers 12 are arranged side by side along a direction in which a plurality of nozzles 21 that eject ink of the same color are arranged in parallel. The direction in which the pressure generation chambers 12 are arranged side by side is defined as a first direction. In the present embodiment, a group of a plurality of pressure generating chambers 12 arranged in parallel along the first direction are arranged in parallel in a second direction orthogonal to the first direction. On the outer side in the second direction of the pressure generation chambers 12 in each row, a communication portion 13 constituting a manifold 100 described later is formed. The communication portion 13 is in communication with one end portion of each pressure generating chamber 12 via the ink supply path 14.

  On the opposite side of the flow path forming substrate 10 from the piezoelectric element 300, a nozzle plate 20 having a nozzle 21 communicating with each pressure generating chamber 12 is fixed via an adhesive, a heat welding film, or the like. The nozzle plate 20 is provided with a nozzle row 21A in which a plurality of nozzles 21 are arranged along the first direction corresponding to the pressure generation chamber 12, and the two nozzle rows 21A are arranged in the second direction. Has been.

  The nozzle plate 20 is made of a silicon single crystal substrate, and the nozzle 21 is formed by, for example, anisotropic etching. The nozzle plate 20 is not limited to a silicon single crystal substrate, and may be formed of SUS.

  In addition, a liquid repellent film 23 is provided on a part of the liquid ejection surface A of the nozzle plate 20 (the surface on the side where the nozzle 21 is opened and ink is ejected) (excluding the edge of the nozzle plate 20). It has been. A liquid repellent tape that is an example of a liquid repellent member is provided on the surface of the cover head 240 and at least a part of the liquid ejecting surface A of the nozzle plate 20 (a region where the liquid repellent film 23 is not provided on the liquid ejecting surface A). Is affixed. Details regarding the joint between the cover head 240 and the nozzle plate 20 and the liquid repellent tape will be described later.

  On the other hand, on the side opposite to the opening surface of the flow path forming substrate 10, on the elastic film 50, a lower electrode film made of metal, a piezoelectric layer made of lead zirconate titanate (PZT) or the like, and made of metal. A piezoelectric element 300 formed by sequentially laminating the upper electrode film is formed. On the flow path forming substrate 10 on which such a piezoelectric element 300 is formed, a protective substrate 30 having a manifold portion 31 constituting at least a part of the manifold 100 is bonded. The manifold portion 31 extends through the protective substrate 30 in the thickness direction and extends in the first direction, and communicates with the communication portion 13 of the flow path forming substrate 10. The manifold portion 31 and the communication portion 13 constitute a manifold 100 serving as an ink chamber common to the pressure generating chambers 12.

  A piezoelectric element holding portion 32 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 protective substrate 30. Examples of such a protective substrate 30 include glass, ceramic, metal, plastic, and the like, but it is preferable to use a material that is substantially the same as the coefficient of thermal expansion of the flow path forming substrate 10. It was formed using a silicon single crystal substrate made of the same material as the path forming substrate 10.

  A drive IC 110 for driving each piezoelectric element 300 is provided on the protective substrate 30. Each terminal of the drive IC 110 is connected to a lead wire drawn from the individual electrode of each piezoelectric element 300 via a bonding wire or the like (not shown). Each terminal of the driving IC 110 is connected to the outside via an external wiring 111 such as a flexible printed cable (FPC) as shown in FIG. 1, and various signals such as a print signal from the outside via the external wiring 111. Receive.

  Further, a compliance substrate 40 is bonded on the protective substrate 30. An ink introduction port 44 for supplying ink to the manifold 100 is formed in a region facing the manifold 100 of the compliance substrate 40 by penetrating in the thickness direction. Further, the region of the compliance substrate 40 other than the ink introduction port 44 in the region facing the manifold 100 is a flexible portion 43 formed thin in the thickness direction, and the manifold 100 is sealed by the flexible portion 43. Has been. The flexible portion 43 provides compliance within the manifold 100.

  As described above, the head main body 220 according to the present embodiment includes the four substrates, that is, the nozzle plate 20, the flow path forming substrate 10, the protective substrate 30, and the compliance substrate 40. A head case 230 is provided on the compliance substrate 40 of the head main body 220.

  The head case 230 is provided with an ink supply communication path 231. The ink supply communication path 231 communicates with the ink introduction port 44 and also communicates with the ink communication path of the cartridge case 210, and supplies ink from the cartridge case 210 to the ink introduction port 44.

  Further, the head case 230 is formed with a recess 232 in a region facing the flexible portion 43 so that the flexible portion 43 is flexibly deformed. The head case 230 is provided with a drive IC holding part 233 penetrating in the thickness direction in a region facing the drive IC 110 provided on the protective substrate 30, and the external wiring 111 is connected to the drive IC holding part 233. Is connected to the drive IC 110.

  Such a head body 220 forms a large number of chips on one silicon wafer at the same time, and bonds and integrates the nozzle plate 20 and the compliance substrate 40, and then, for each flow path forming substrate 10 of one chip size. The head main body 220 is obtained by dividing the head main body 220.

  Each member constituting the head case 230 and 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. The head body 220 and the head case 230 are integrally formed by inserting pins into the pin insertion hole 234 and joining the members while performing relative positioning of the members.

  The head main body 220 according to this embodiment takes in ink from the ink cartridge from the ink introduction port 44 via the ink communication path and the ink supply communication path 231, and inks the inside of the flow path from the manifold 100 to the nozzle 21. Fill with. Thereafter, the head main body 220 applies a voltage to each piezoelectric element 300 corresponding to the pressure generating chamber 12 in accordance with a recording signal from the driving IC 110 to bend and deform the elastic film 50 and the piezoelectric element 300. Due to the bending deformation of the piezoelectric element 300, the pressure in each pressure generating chamber 12 is increased and ink droplets are ejected from the nozzle 21.

  Further, since the recording head 1 of the present embodiment includes four head bodies 220 including two nozzle arrays 21A, the recording head 1 includes eight nozzle arrays 21A in total. By increasing the number of recording heads 1 in this way, it is possible to prevent a decrease in yield as compared with the case where the nozzle arrays 21A are formed in multiple lines in one head body 220. Further, by using a plurality of head main bodies 220 in order to increase the number of nozzle arrays 21A, the number of head main bodies 220 that can be formed from a single silicon wafer can be increased. Can be reduced to reduce the manufacturing cost.

  Here, the joint portion between the cover head 240 and the nozzle plate 20 and the liquid repellent tape will be described in detail. FIG. 5 is an enlarged view of a main part of FIG.

  As shown in the figure, a liquid repellent film 23 is provided on the liquid ejection surface A of the nozzle plate 20 via a base film 22.

The base film 22 can be a plasma polymerized film of silicon material, SiO ₂ , ZnO, NiO, SnO ₂ , Al ₂ O ₃ , ZrO ₂ , copper oxide, silver oxide, chromium oxide, or iron oxide. In this embodiment, a plasma polymerization film obtained by polymerizing silicone with argon plasma gas is used as the base film 22. The base film 22 has a role of improving the adhesion between the liquid repellent film 23 which is a molecular film described later and the nozzle plate 20 made of a silicon single crystal substrate.

  The liquid repellent film 23 is a film having liquid repellency with respect to ink. For example, it consists of a metal alkoxide molecular film. The molecular film can be formed by mixing a silane coupling agent such as alkoxysilane with a solvent such as thinner to form a metal alkoxide solution, and immersing the nozzle plate 20 in the metal alkoxide solution.

  The liquid repellent film 23 made of the molecular film can be formed thinner than a conventional liquid repellent film, for example, a liquid repellent film formed by eutectoid plating, and the liquid ejecting surface A is wiped by wiping when cleaning the head surface. This also has the advantage that the rub resistance and liquid resistance can be improved without deteriorating the liquid repellency. Of course, although the abrasion resistance and liquid repellency are inferior, a conventional liquid repellent film can also be used.

  The end portions of the liquid repellent film 23 and the base film 22, that is, the region in the vicinity of the step 24 of the nozzle plate 20 described later is removed, and the liquid ejection surface A of the nozzle plate 20 is exposed. The area where the liquid ejection surface A is exposed is referred to as a non-liquid-repellent area 26, and the area where the liquid-repellent film 23 appears on the surface is referred to as a water-repellent area 27.

  At the edge of the liquid ejection surface A of the nozzle plate 20, a step 24 that is recessed from the liquid ejection surface A in the direction opposite to the direction in which ink is ejected (lower side in the figure) is provided. The depth of the step 24 is substantially the same as the thickness of the joint 242. In the present embodiment, the step 24 is provided over the entire edge of the liquid ejection surface of the nozzle plate 20.

  The step 24 is a planar region where the joint portion 242 (the frame portion 243 and the beam portion 244) of the cover head 240 is joined. A part of the surface of the joint portion 242 of the cover head 240 is bonded to the step 24 via an adhesive 28. Thus, each head body 220 is fixed to the cover head 240 by bonding the step 24 of the nozzle plate 20 to the joint 242 with the adhesive 28.

  A liquid repellent tape 25, which is an example of a liquid repellent member, is attached to a part of the surface of the joint portion 242 joined to the step 24. The liquid repellent tape 25 is formed in a shape that covers the entire outer surface of the cover head 240. That is, the cover head 240 is formed in accordance with the shape of the frame part 243, the beam part 244 and the side wall part 245. A liquid repellent tape 25 is attached to the surface of the frame portion 243, the beam portion 244, and the side wall portion 245 opposite to the head body 220 with an adhesive (not shown).

  Further, the liquid repellent tape 25 extends from the joint portion 242 to the non-liquid repellent area 26 of the nozzle plate 20. Specifically, the liquid repellent tape 25 has an end portion 25 a that extends inward (center side of the nozzle plate 20) from the exposed opening 241. The end portion 25a covers the non-liquid-repellent area 26 of the nozzle plate 20, and an adhesive (not shown) provides the non-liquid-repellent area 26 (at least part of the surface of the nozzle plate 20. In this embodiment, the liquid-repellent film 23 is provided. The surface is not attached.)

  Such a liquid repellent tape 25 is formed of a film made of polyimide, polyester, or the like used in COF (chip on film) or FPC (flexible printed circuit board). The liquid repellent tape 25 is not limited to being formed from such a film, but may be a member formed in a tape shape from a material having liquid repellency with respect to ink. For example, a liquid repellent tape in which a film similar to the liquid repellent film 23 described above is formed on one surface of a tape-shaped member made of resin or the like can also be used.

  As described above, since the surface of the cover head 240 is covered with the liquid repellent tape 25, ink is prevented from adhering to the cover head 240. That is, it is possible to prevent protrusions from being generated by the ink adhering to the surface of the cover head 240 and solidifying. Furthermore, since the liquid repellent tape 25 continues to the non-liquid repellent area 26 of the nozzle plate 20, the entire surface of the joint portion 242 of the cover head 240 can be reliably covered.

  As described above, according to the recording head 1 according to the present embodiment, the surface of the cover head 240 to which ink may adhere can be reliably protected by the liquid repellent tape 25. In other words, it is possible to prevent protrusions that are solidified due to ink adhering to the cover head 240. This prevents the protrusions from coming into contact with a print medium such as paper and rubbing the paper surface.

  In the present embodiment, since the liquid repellent film 23 is also provided on the nozzle plate 20, it is possible to prevent protrusions from occurring on the surface of the nozzle plate 20.

  Furthermore, in the recording head 1 according to the present embodiment, the liquid repellent tape 25 is provided only on the surface (outer surface) opposite to the head body 220 without providing the liquid repellent film on the entire surface of the cover head 240. Yes. Thereby, since the adhesive 28 that adheres the cover head 240 and the nozzle plate 20 does not have a reduced adhesive force, the cover head 240 and the nozzle plate 20 can be reliably bonded. In the present embodiment, since the conductive member having the protrusion is not interposed between the cover head 240 and the nozzle plate 20 in order to improve the adhesion, the nozzle plate 20 cannot be damaged by the protrusion.

  In the recording head according to the related art, if a liquid-repellent film is selectively formed on the outer surface of the cover head 240 using a mask, labor and cost are required. Further, the cover head 240 is deformed by applying / peeling the mask.

  However, in the recording head 1 according to the present embodiment, the liquid repellent tape 25 is simply provided on the outer surface of the cover head 240 without taking such labor and cost and without causing the cover head 240 to be deformed. Ink can be prevented from adhering to the outer surface.

  Here, if the joint 242 and the non-liquid-repellent region 26 are not flush with each other and there is a step, the liquid-repellent tape 25 is bonded to the joint 242 and the non-liquid-repellent region 26 with the step bent. It will be. For this reason, the liquid repellent tape 25 is peeled off from the joint portion 242 or the non-liquid repellent area 26 by a restoring force to return from the folded state.

  However, in the recording head 1 according to the present embodiment, the nozzle plate 20 is provided with the step 24 and the joining portion 242 is joined to the step 24 so that the surface of the joining portion 242 is substantially the same as the liquid ejection surface A of the nozzle plate 20. It is one. The liquid repellent tape 25 can be applied in a planar manner to the joint portion 242 and the non-liquid repellent region 26 that are flush with each other without being bent. Therefore, the liquid repellent tape 25 is difficult to peel off from the joint portion 242 and the non-liquid repellent region 26. Thereby, the recording head 1 in which the peeling of the liquid repellent tape 25 is prevented is provided.

<Embodiment 2>
In the first embodiment, the liquid repellent tape 25 is bonded to the non-liquid repellent area 26 with an adhesive, but is not limited to such a mode.

  FIG. 6A is an enlarged cross-sectional view of a main part of the recording head according to the second embodiment. In addition, the same code | symbol is attached | subjected to the same thing as Embodiment 1, and the overlapping description is abbreviate | omitted.

  The liquid repellent tape 25 according to this embodiment is a COF film on which a wiring pattern made of metal is formed. A part of the wiring pattern is exposed at the end 25 a of the liquid repellent tape 25 on the surface of the nozzle plate 20 on the liquid ejection surface A side. Solder 29 is provided on a part of the exposed wiring pattern. On the other hand, the nozzle plate 20 is made of SUS.

  Similarly to the first embodiment, the liquid repellent tape 25 covers the side wall portion 245 and the joint portion 242 of the cover head 240, and the end portion 25 a continuously covers the non-liquid repellent region 26. The end 25 a and the non-liquid repellent region 26 are joined by solder 29.

  In this way, the liquid repellent tape 25 can be firmly bonded to the nozzle plate 20 by metal bonding with the solder 29. Even when the nozzle plate 20 is formed of a silicon single crystal substrate, metal bonding by soldering may be performed in the same manner. In this case, a metal wiring pattern is also formed on the nozzle plate 20 side. Then, the wiring patterns formed on both the end portion 25 a and the nozzle plate 20 are metal-bonded with solder 29.

  In the first embodiment, the liquid repellent tape 25 is bonded to the surface of the nozzle plate 20, but is not limited to such a mode.

  FIG. 6B is an enlarged cross-sectional view of a main part of the recording head according to the second embodiment. In addition, the same code | symbol is attached | subjected to the same thing as Embodiment 1, and the overlapping description is abbreviate | omitted.

  In the nozzle plate 20 according to this embodiment, a base film 22 is provided on the liquid ejection surface A, and a liquid repellent film 23 is provided on the base film 22.

  At the end of the nozzle plate 20 near the step 24, the liquid-repellent film 23 is partially removed, and the base film 22 is exposed. The base film 22 and the surface of the joint portion 242 joined to the step 24 are substantially flush with each other. A portion where the base film 22 is exposed is a non-liquid repellent region 26.

  The liquid repellent tape 25 covers the surface of the side wall portion 245 and the joint portion 242 of the cover head 240 and continuously covers the non-liquid repellent region 26. Unlike the liquid repellent film 23, the base film 22 does not reduce the adhesive strength of the adhesive, so that the liquid repellent tape 25 can be reliably bonded to the nozzle plate 20.

<Embodiment 3>
The recording head 1 exemplified in the first and second embodiments is mounted on an ink jet recording apparatus I. FIG. 7 is a schematic view showing an ink jet recording apparatus according to an embodiment of the present invention.

  As shown in the drawing, an ink jet recording apparatus I that is a liquid ejecting apparatus according to the present embodiment includes, for example, a plurality of different color inks such as black (B), cyan (C), magenta (M), and yellow (Y). The recording head 1 is equipped with an ink cartridge (liquid storage means) 2 having a storage chamber in which is stored. The recording head 1 is mounted on a carriage 3, and the carriage 3 on which the recording head 1 is mounted is provided on a carriage shaft 5 attached to the apparatus body 4 so as to be movable in the axial direction. Then, the driving force of the driving motor 6 is transmitted to the carriage 3 through a plurality of gears and a timing belt 7 (not shown), so that the carriage 3 is moved along the carriage shaft 5. On the other hand, the apparatus body 4 is provided with a platen 8 along the carriage shaft 5, so that a recording medium S such as paper fed by a paper feeding device (not shown) is conveyed on the platen 8. ing.

<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.

  For example, in Embodiment 1 described above, the cover head 240 is exemplified as the fixing member that holds the nozzle plate 20 of the head main body 220, but the fixing member is not particularly limited thereto. For example, it may be a flat plate-like fixing member that does not have the side wall portion 245 and is composed only of the joint portion 242. Further, although one cover head 240 is commonly attached to the plurality of head main bodies 220, the present invention is not limited to such a mode. For example, one cover head 240 may be provided on one head body 220.

  The liquid repellent tape 25 does not need to cover the entire outer surface of the cover head 240, and may be provided on at least a part of the outer surface. For example, the liquid repellent tape 25 may be bonded only to the surface of the bonding portion 242 that is flush with the liquid ejection surface A. Moreover, although the liquid repellent tape 25 was provided in the whole edge part of the liquid ejection surface A, it is not limited to such an aspect. For example, the liquid repellent tape 25 may be joined to a part of the edge of the liquid ejection surface A so that the nozzle 21 is not sealed.

  Further, in the first embodiment described above, the flexural vibration type piezoelectric element 300 has been described as the pressure generating means for causing the pressure change in the pressure generating chamber 12, but the present invention is not particularly limited thereto. A longitudinal vibration type piezoelectric element that is alternately stacked with electrode forming materials and expands and contracts in the axial direction can be used. In addition, as a pressure generating means, a heating element is arranged in the pressure generating chamber, and droplets are ejected from the nozzle by bubbles generated by heat generation of the heating element, or static electricity is generated between the diaphragm and the electrode. In addition, it is possible to use a device in which a diaphragm is deformed by electrostatic force and droplets are ejected from a nozzle.

  Note that the ink jet recording head, the ink jet recording head unit, and the ink jet recording apparatus I that discharge ink as the liquid ejecting head have been described as examples. However, the present invention is broadly described as a liquid ejecting head, a liquid ejecting head unit, and a liquid ejecting apparatus. It is intended for general use. 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.

  I ink jet recording apparatus (liquid ejecting apparatus), 1 ink jet recording head (liquid ejecting head), 10 flow path forming substrate, 20 nozzle plate, 21 nozzle, 22 base film, 23 liquid repellent film, 24 step, 25 liquid repellent Tape, 25a end, 26 non-liquid repellent area, 27 water repellent area, 28, adhesive, 29 solder, 220 head body, 240 cover head, 241 exposed opening, 242 joint, 243 frame, 244 beam, 245 Side wall

Claims (4)

A head body having a liquid ejection surface provided with a nozzle for ejecting liquid;
A fixing member fixed to the head body and having an exposed opening through which the nozzle is exposed,
At the edge of the liquid ejecting surface of the head body, a step that is recessed from the liquid ejecting surface in a direction opposite to the direction in which the liquid is ejected is provided,
The fixing member is joined to the step of the head body,
A liquid ejecting head, wherein a liquid repellent member having liquid repellency with respect to the liquid is continuously provided from at least a part of the surface of the fixing member to a part of the liquid ejecting surface. The liquid ejecting head according to claim 1,
The liquid ejecting head, wherein the fixing member is metal-bonded to the step of the head body. The liquid ejecting head according to claim 1 or 2,
The liquid ejection surface has a liquid repellent region provided with a liquid repellent film and a non-liquid repellent region,
The liquid ejecting head, wherein the liquid repellent member is continuously provided from at least a part of the surface of the fixing member to a non-liquid repellent region of the liquid ejecting surface.   A liquid ejecting apparatus comprising the liquid ejecting head according to claim 1.

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