JP4788237B2 - Droplet discharge head - Google Patents

Description

  The present invention relates to a droplet discharge head that discharges droplets onto a recording medium.

  In an ink jet recording head used in an ink jet recording apparatus, when an ink droplet is ejected from a nozzle, ink leakage may occur due to an overshoot phenomenon in which the ink rises from the nozzle, and the ink droplet may adhere to the periphery of the nozzle. The ink adhering to the periphery of the nozzle may incline the ink ejection direction, and the ink droplet diameter and speed may vary, and this may cause the printing performance of the ink jet recording head to deteriorate significantly.

  In order to prevent ink droplets from adhering to the periphery of the nozzle, a water repellent film is applied to the nozzle surface. However, this water-repellent film may be destroyed by rubbing due to paper floating or mechanical friction due to wiping for maintenance of the nozzle surface. As a result, the ink ejection performance is deteriorated, for example, the ink ejection direction is inclined and the ink droplet diameter and speed are varied.

  As a countermeasure, as shown in FIG. 10A, a metal plate 106 having a counterbore hole 104 is laminated on the nozzle plate 102 to form a counterbore (step) around the nozzle 108. By retreating the portion on which the nozzle 108 is formed from the surrounding plate surface, the water repellent film 110 around the nozzle 108 is prevented from being subjected to friction due to contact with paper or mechanical friction due to wiping or the like. (See Patent Document 1).

  However, in Patent Document 1, since the nozzles 108 are individually surrounded by the holes 104 formed in the metal plate 106, when the excess ink on the nozzle surface is removed during maintenance, the removed excess ink, dust, or the like is removed from the holes 104. The residual ink is poorly removed, such as remaining in the corners (side walls) of the ink.

On the other hand, as shown in FIG. 10B, by surrounding the plurality of nozzles 112 arranged on the same line with recesses 114 extending along the arrangement direction of the nozzles 112, the periphery of the nozzles 112 is surrounded by the plate surface. There exists what was made the structure made to reverse (refer patent document 2). However, in Patent Document 2, although the removability of excess ink around the nozzle 112 located in the center of the recess 114 is improved, excess ink, dust, or the like accumulates at the end of the recess 114, and The removability of excess ink around the nozzle 112 located in the vicinity of the end portion is poor, and the discharge performance of the nozzle 112 in the vicinity of the end portion is deteriorated.
JP-A-4-234665 JP 11-334084 A

  In consideration of the above problems, an object of the present invention is to prevent excess ink from being removed from all nozzles and to prevent dust from being collected around the nozzles.

  According to the first aspect of the present invention, in the recording head having a nozzle row composed of a plurality of nozzles for discharging droplets, the nozzle rows are arranged on both sides of the nozzle row on a droplet discharge surface on which the droplets are discharged. And a horizontal convex portion that connects one end of the vertical convex portion on the side in which the nozzles are arranged is provided.

The present invention is defined in claim 1, a recording head having a nozzle array comprising a plurality of nozzles for ejecting droplets, the droplet ejecting face of the liquid droplet is ejected, the across adjacent nozzle rows nozzle In addition , an inclined convex portion is provided in an oblique direction with respect to the nozzle row.

According to the first aspect of the present invention, the inclined convex portion provided across the adjacent nozzle rows is provided in an oblique direction with respect to the nozzle rows. As a result, excess ink, dust, or the like adhering to the nozzle moves obliquely with respect to the nozzle row along the inclined convex portion. Therefore, excess ink, dust, etc. do not collect around the nozzles. Further, since excess ink, dust, and the like are moved obliquely, the direction in which the cleaning member that cleans the nozzles is moved is not limited.

  Furthermore, since the inclined convex portion is provided in a wide area across the nozzle row, it is possible to prevent the pressing force applied to the nozzle plate from being concentrated in a narrow range when another plate is joined to the nozzle plate. . Therefore, there is no possibility that the nozzle plate is bent or damaged by the pressing force.

According to a second aspect of the present invention, in the invention according to the first aspect, the nozzles provided in the nozzle row are orthogonal to the nozzle arrangement direction with respect to the nozzles provided in the adjacent nozzle row. The inclined convex portions are inclined obliquely across the adjacent nozzle rows so that the nozzles provided in the adjacent nozzle rows are shifted by one in the nozzle arrangement direction. It is characterized by.

  According to the seventh aspect of the present invention, the nozzle is surrounded by the annular annular convex portion having an opening formed at least at one place. As a result, excess ink, dust or the like adhering to the nozzle is discharged from the opening to the outside of the annular convex portion, so that it does not collect around the nozzle.

  Since the present invention has the above-described configuration, it is possible to remove excess ink at all nozzles and prevent dust and the like from being collected around the nozzles.

Hereinafter, a reference embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing an ink jet recording head 10 according to a reference embodiment of the present invention.

  As shown in FIG. 1, the ink jet recording head 10 includes a total of seven protection convex portions 12, a nozzle plate 14, a pool plate 16, a communication hole plate 18, a supply path plate 20, a pressure chamber plate 22, and a diaphragm 24. The plates are formed by aligning and laminating the plates and bonding them by a bonding means such as an adhesive.

  The nozzle plate 14 is provided with nozzles 26 that eject ink. As shown in FIG. 2, the nozzles 26 are arranged at a predetermined interval along a direction orthogonal to the paper transport direction, and form a nozzle row 26A. A plurality of the nozzle rows 26A are arranged at predetermined intervals along the paper transport direction.

Further, as shown in FIG. 1, the nozzle plate 14 is made of a synthetic resin excellent in mechanical strength, chemical resistance and thinning, and polyimide is used in the present embodiment . By using polyimide, there is an advantage that crosstalk is suppressed by a damper effect when ejection energy is given to the ink.

  In the pool plate 16 and the communication hole plate 18, communication holes 28 and 30 are formed, respectively. A supply hole 32 is formed in the supply path plate 20. The nozzle 26, the communication holes 28 and 30, and the supply hole 32 communicate with the pool plate 16, the communication hole plate 18, and the supply path plate 20 in a stacked state, and a pressure chamber 34 formed in the pressure chamber plate 22. It is connected.

  An ink pool 40 is formed on the pool plate 16 and stores ink supplied from an ink supply hole (not shown). The communication hole plate 18 and the supply path plate 20 are provided with supply holes 42 and 44, respectively. The ink pool 40 and the supply holes 42 and 44 communicate with each other in a state where the pool plate 16, the communication hole plate 18, and the supply path plate 20 are stacked, and are connected to a pressure chamber 34 formed in the pressure chamber plate 22.

  Although not shown, a single plate type piezoelectric element is attached to the upper portion of the vibration plate 24 above the pressure chamber 34 so that a driving voltage is applied from a flexible wiring board (not shown). ing.

  With the above configuration, the ink supplied from the ink supply hole (not shown) and stored in the ink pool 40 is filled into the pressure chamber 34 through the supply holes 42 and 44. When a drive voltage is applied to the piezoelectric element (not shown), the diaphragm 24 is deformed together with the piezoelectric element to expand or compress the pressure chamber 34. As a result, a volume change occurs in the pressure chamber 34, and a pressure wave is generated in the pressure chamber 34. The ink is moved by the action of the pressure wave, and ink droplets are ejected from the nozzle 26 to the outside.

On the other hand, a protective projection 12 is provided on the surface (nozzle surface) of the nozzle plate 14 on the ink discharge side. As shown in FIG. 2, the protective convex portion 12 has a thin plate shape, and as shown in FIG. 2, a rectangular vertical convex portion 12A provided on both sides of the nozzle row 26A along the arrangement direction of the nozzles 26 and one of the vertical convex portions 12A. It is configured in a comb-like shape with a horizontal convex portion 12B provided at the end and connecting the other vertical convex portions 12A. That is, the protective convex portion 12 is provided on the ink discharge side surface of the nozzle plate 14 so as to surround the three directions of the nozzle row 26A. Thus, the nozzle plate 14 is provided with a step, and the nozzle 26 is formed at the step. In this reference embodiment , the thickness of the protective convex portion 12 is 5 μm or more and 50 μm or less, but the thickness of the protective convex portion 12 is not limited to this value.

  In this way, by providing a step on the surface of the nozzle plate 14 on the ink ejection side, the paper that has floated during printing is prevented from coming into contact with the nozzle surface. Therefore, a water repellent film 38, which will be described later, provided around the nozzle 26. Is not scratched.

  A water repellent film 38 is provided around the surface of the protective convex portion 12, the side wall of the protective convex portion 12, and the nozzle 26 surrounded by the protective convex portion 12. The water repellent film 38 prevents ink ejected from the nozzle 26 from adhering around the nozzle 26. As a result, the ejection performance of the ink droplets ejected from the nozzle 26 is not reduced. In FIG. 2, the water repellent film 38 is omitted.

  By the way, the nozzle surface of the nozzle plate 14 is wiped by a wiper blade (not shown) that moves along a direction (arrow A direction) perpendicular to the paper transport direction by contacting the nozzle surface during a maintenance operation. ing. At this time, the nozzle row 26 </ b> A is surrounded by the comb-like protective convex portions 12 (vertical convex portions 12 </ b> A and horizontal convex portions 12 </ b> B), and one end portion in the arrangement direction of the nozzles 26 is open. That is, since the end of the wiper blade on the downstream side in the wiping direction is opened, excess ink, dust or the like adhering to the nozzle 26 is discharged from the side opened by the wiper blade to the outside of the protective projection 12. Therefore, it is difficult to collect around the nozzle 26.

  Next, a method for manufacturing the inkjet recording head 10 will be described.

  First, as shown in FIG. 3A, a protective convex portion 12 made of a metal such as SUS is pressure-bonded to the surface of a nozzle plate 14 made of a polyimide film by heating and pressing.

  Next, a resist 58 was applied to the surface of the protective convex portion 12 by spin coating, and after pre-baking, a pattern mask on which the shape of the protective convex portion 12 was baked was superimposed and UV exposed to selectively expose the resist 58. Later, it is immersed in a developing solution and developed, and then baked again. Thereby, as shown in FIG. 3B, a pattern is formed on the resist 58 on the surface of the protective convex portion 12.

  Next, using oxygen plasma, the protective projection 12 is dry-etched using the resist 58 as a mask, and the resist 58 is removed. As a result, as shown in FIG. 3C, the protective convex portion 12 is formed in a predetermined shape (for example, substantially U-shaped as shown in FIG. 2).

Next, as shown in FIG. 3D, a water repellent film 38 is formed on the surface of the protective convex portion 12, that is, the surface on the ink ejection side, by vapor deposition or the like. The water-repellent film 38 includes a tetrafluoroethylene-6 fluoropropylene copolymer (FEP), a tetrafluoroethylene resin (PTFE), a tetrafluoroethylene-perfluoroalkoxyethylene copolymer resin (PFA), a fluorine Fluorine resins such as vinylidene fluoride resin and vinyl fluoride resin are used. In particular, tetrafluoroethylene resin (PTFE) and tetrafluoroethylene-perfluoroalkoxyethylene copolymer resin (PFA) are preferable, and tetrafluoroethylene resin (PTFE) is used in this embodiment .

  Next, as shown in FIG. 3E, a protective sheet 46 is adhered to the surface of the water repellent film 38 by a vacuum laminator. As a result, the water repellent film 38 is covered with the protective sheet 46. The protective sheet 46 is a sheet that can be ablated by the excimer laser L. Here, as protective sheet 46, ORDYL BF45Z (manufactured by Tokyo Ohka), ELEP holder BT-150E-KL (manufactured by Nitto Denko), ELEGRIP TAPE AD-80H (manufactured by Denki Kagaku Kogyo), etc. are used.

  Ablation is a phenomenon in which the polymer material absorbs the excimer laser L and thereby the molecular bond of the polymer material is broken, and the broken molecules and atoms are decomposed and scattered. This is a processing method for forming a desired shape in a polymer material using ablation.

  Then, as shown in FIG. 3F, the excimer laser L is irradiated from the back surface (the side opposite to the ink ejection side) of the nozzle plate 14. In the irradiation region of the excimer laser L, a hole having a shape substantially similar to the beam cross section of the excimer laser L (a shape corresponding to the nozzle 26) is formed, and the hole is dug deeper as the irradiation time of the excimer laser L increases. This hole penetrates the nozzle plate 14 and the water repellent film 38 and irradiates the excimer laser L until reaching the middle of the protective sheet 46, thereby forming a hole corresponding to the nozzle 26 in the nozzle plate 14 and the water repellent film 38. .

  By forming the hole 38A in the water repellent film 38 by the above method, no burr is generated around the hole 38A, and the hole 38A can be formed with high accuracy.

  Then, as shown in FIG. 3G, the protective sheet 46 is peeled off and removed. A plurality of nozzles 26 formed by the above configuration are provided in a predetermined pattern.

  Thereafter, as shown in FIG. 1, the pool plate 16 is joined to the back surface of the nozzle plate 14. The communication hole plate 18, the supply path plate 20, and the pressure chamber plate 22 are joined to the pool plate 16, and the diaphragm 24 is joined so as to cover the opening of the pressure chamber plate 22.

  The ink jet recording head 10 is formed by the above steps.

The water repellent film 38 is permeable to the excimer laser L, and a hole corresponding to the nozzle 26 cannot be formed directly by the excimer laser L. Therefore, in this embodiment , the nozzle plate 14 is ablated by the excimer laser L and the protective sheet 46 is ablated via the water-repellent film 38, so that the nozzle plate 14 and the protective sheet 46 are disassembled and scattered. A hole 38 </ b> A is formed in the water-repellent film 38 by molecules and atoms. As a result, a hole 38A having a cross-sectional shape of the excimer laser L (a shape corresponding to the nozzle 26) is also formed in the water repellent film 38.

In this reference embodiment , the water-repellent film 38 is formed on the surface of the protective projection 12 by the vapor deposition method. However, the method for forming the water-repellent film 38 is not limited to the vapor deposition method. May be used.

  Moreover, although the protective convex part 12 was formed by etching, the formation method of the protective convex part 12 is not limited to an etching. For example, a protective convex portion formed in a predetermined shape by laser processing or press processing may be pressure-bonded to the nozzle plate 14.

In the present embodiment , as shown in FIG. 2, the nozzle row 26 </ b> A is formed by the protective convex portion 12 including the vertical convex portion 12 </ b> A and the horizontal convex portion 12 </ b> B that connects one end of the vertical convex portion 12 </ b> A. Although it was set as the structure enclosed, a protection convex part is not limited to this form.

  For example, as shown in FIG. 4 (A), a protective convex portion composed of a convex portion 50A provided along the arrangement direction of the nozzles 26 and a convex portion 50B connecting one end of the convex portion 50A. 50, a convex portion 50C projecting toward the nozzle 26 may be formed in the vicinity of the nozzle 26 of the convex portion 50A. As a result, the protective convex portion 50 has a corrugated shape in which the gap between the nozzles 26 is narrow and the gap between the nozzles 26 is wide, and the leading edge of the paper is less likely to hit the nozzle surface. Therefore, damage to the water repellent film 38 (see FIG. 1) provided on the nozzle surface can be prevented.

  Further, as shown in FIG. 4B, a protective convex portion composed of a convex portion 52A provided along the arrangement direction of the nozzles 26 and a convex portion 52B connecting one end of the convex portion 52A. In 52, a recess 52C may be formed in the vicinity of the nozzle 26 of the protrusion 52A. As a result, the protective convex portion 50 has a wavy shape in which the gap between the nozzles 26 is wide and the gap between the nozzles 26 is narrow, and excess ink or dust attached to the nozzles 26 by the wiper blade stays in the concave portions 52C. Therefore, it does not collect around the nozzle 26.

Next, an embodiment of the present invention will be described. In addition, the description about the part similar to the reference form of this invention is omitted.

  As shown in FIG. 5, the surrounding convex portion 60 provided on the nozzle surface of the nozzle plate 14 has a plate shape that is substantially the same size as the nozzle plate 14, and all the nozzles are exposed when stacked on the nozzle plate 14. An opening 62 of a size to be formed is formed in a square shape. That is, the surrounding convex portion 60 is provided along the edge of the nozzle plate 14 and surrounds all the nozzles 26.

  Thereby, when joining the pool plate 16 (refer FIG. 1) to the nozzle plate 14, the pressing force concerning the nozzle plate 14 is received by the surrounding convex part 60. FIG. Therefore, there is no fear that the nozzle plate 14 is bent or damaged when the pressing force is concentrated on one point of the nozzle plate 14.

  Further, a long convex portion 64 is provided between the nozzle rows 26A. The convex portion 64 is slightly smaller in size in the longitudinal direction than the opening 62 of the surrounding convex portion 60, and a gap 66 is formed between the opening 62 and the convex portion 64.

  When the wiping blade is wiped along the longitudinal direction (arrow A direction) of the convex portion 64, excess ink and dust adhering to the nozzle 26 are removed by the wiper blade, and the wall of the opening 62 on the wiping direction side is removed. The wall portion is moved along the gap 66 while adhering to the portion. Accordingly, excess ink, dust, or the like does not collect around the nozzles 26.

  In the present embodiment, the surrounding projections 60 are provided at the edge of the nozzle plate 14, and the nozzles 26 are provided in the openings 62 of the surrounding projections 60 while the gaps 66 are provided on both sides in the arrangement direction of the nozzles 26. However, as shown in FIG. 6A, one end portion of the protective convex portion 68 provided along the arrangement direction of the nozzles 26 is surrounded by the surrounding convex portion. 60 may be connected. In other words, the gap 69 is formed on one side in the arrangement direction of the nozzle 26. At this time, if the wiping blade is moved toward the gap 69, excess ink, dust, etc. move to the gap 69 and do not accumulate around the nozzles 26.

  Further, as shown in FIG. 6B, the opening 72 may be formed on the nozzle row 26 </ b> A of the surrounding convex portion 70 provided at the edge of the nozzle plate 14. That is, since the opening 72 is provided along the wiping direction, excess ink, dust, or the like adhering to the nozzle 26 is discharged from the opening 72 to the outside of the nozzle surface. Accordingly, excess ink, dust, or the like does not collect around the nozzles 26.

  Furthermore, as shown in FIG. 7A, a protruding portion 74A that protrudes toward the nozzle 26 may be formed in the vicinity of the nozzle 26 of the convex portion 74 provided between the nozzle rows 26A. Thereby, the space | interval of the nozzle 26 and the convex part 74 (overhang | projection part 74A) becomes narrow, the front-end | tip of a paper becomes difficult to touch a nozzle surface, and damage to the water-repellent film 38 (refer FIG. 1) of a nozzle surface can be prevented. Further, as shown in FIG. 7B, a recess 76A may be formed in the vicinity of the nozzle 26 of the protrusion 76 provided between the nozzle rows 26A. As a result, the gap between the nozzle 26 and the convex portion 76 (concave portion 76A) is increased, so that excess ink, dust or the like does not accumulate around the nozzle 26.

In the reference embodiment and the embodiment of the present invention, the configuration in which the convex portions are provided on both sides of the nozzle row 26A (between the nozzle rows 26A) has been described. However, as shown in FIG. (Between 26) may be provided with a convex portion.

  For example, as shown in FIG. 8A, rectangular protective convex portions 80 are provided on both sides of the nozzle row 26A along the arrangement direction of the nozzles 26, and small convex portions 82 are provided on both sides of the nozzle 26 in the arrangement direction. Provide. As a result, when excess ink or dust attached to the nozzle 26 is removed by the wiper blade, excess ink or dust or the like of the upstream nozzle 26 in the wiping direction (arrow A direction) enters the downstream nozzle 26. There is no fear.

  Further, as shown in FIG. 8B, convex portions 84 are provided on both sides of the nozzles 26 in the arrangement direction, and gaps are provided between the convex portions 84 so as to project both sides in the direction orthogonal to the arrangement direction of the nozzles 26. A portion 85 may be provided. Thereby, since the nozzle 26 is surrounded by the convex part 84 and the convex part 85, it becomes difficult for the front end of a sheet | seat to hit a nozzle surface, and damage to the water-repellent film 38 (refer FIG. 1) of a nozzle surface can be prevented. In addition, since a plurality of gaps are formed around the nozzle 26 by the convex portions 84 and the convex portions 85, excess ink, dust, and the like are discharged from the gaps. Accordingly, surplus ink, dust, and the like do not accumulate around the nozzles 26. Further, since the gap is formed in the arrangement direction of the nozzles 26 and the paper transport direction, even if wiping is performed in the paper transport direction, excess ink, dust or the like does not collect around the nozzles 26. That is, the wiping direction is not limited.

  Further, as shown in FIG. 8C, an inclined convex portion 86 may be provided so as to straddle the adjacent nozzle rows 26A and 26B. For example, the sloped convex portion 86 is provided below the lowermost nozzle 26a in the drawing of the nozzle row 26A and from below the nozzle row 26B adjacent to the nozzle row 26A to below the second stage nozzle 26b. That is, the inclined convex portion 86 is provided obliquely with respect to the nozzle rows 26A and 26B and the paper transport direction. As a result, when wiping is performed along the nozzle rows 26A and 26B, surplus ink, dust, and the like adhering to the nozzle 26 move obliquely along the wall surface of the inclined convex portion 86 provided obliquely. Therefore, excess ink, dust, etc. do not collect around the nozzles 26. Further, since the inclined convex portion 86 is provided in a wide range with respect to the nozzle surface, the pressure applied to the nozzle plate 14 when the pool plate 16 (see FIG. 1) is joined to the nozzle plate 14 is a narrow range. You can avoid concentrating on. Therefore, there is no fear that the nozzle plate 14 is bent or damaged by the pressing force. Furthermore, since the inclined convex portion 86 is provided obliquely with respect to the nozzle rows 26A and 26B and the paper transport direction, the wiping direction is not limited.

  Further, as shown in FIG. 9, an annular convex portion 88 may be provided around the nozzle 26. At this time, since the nozzle 26 is surrounded by the annular projection 88, the nozzle surface is protected from the leading edge of the paper P. At this time, by providing an opening in the annular protrusion 88, excess ink or dust attached to the nozzle 26 is removed by the wiper blade and discharged from the opening, so that it does not collect around the nozzle 26. For example, as shown in FIG. 9A, two openings 90 are formed in the annular convex portion 88 along the arrangement direction of the nozzles 26, and wiping is performed along the arrangement direction (arrow A direction) of the nozzles 26. In such a case, excess ink, dust, or the like is discharged from the opening 90. Further, as shown in FIG. 9B, three openings 92 are formed in the annular convex portion 88, and one of them is formed along the arrangement direction of the nozzles 26, so that the nozzles 26 are arranged in the arrangement direction. When wiping along the nozzle 26, excess ink or dust adhering to the upstream nozzle 26 in the wiping direction is discharged from the opening 92 formed along the arrangement direction of the nozzles 26 and surrounds the downstream nozzle 26. It moves in the paper conveying direction along the wall surface of the annular convex portion 88. Accordingly, there is no possibility that excess ink, dust, or the like of the upstream nozzle 26 in the wiping direction enters the downstream nozzle 26. Further, as shown in FIG. 9C, openings 94 are formed at four locations in the arrangement direction of the nozzles 26 of the annular convex portion 88 and in the paper conveyance direction. Thus, excess ink, dust, or the like does not accumulate around the nozzles 26 regardless of whether they are wiped along the arrangement direction of the nozzles 26 or wiped along the paper transport direction. That is, the wiping direction is not limited.

It is sectional drawing which shows the inkjet recording head which concerns on the reference form of this invention. It is a perspective view which shows the inkjet recording head which concerns on the reference form of this invention. It is the figure which showed typically a part of manufacturing process of the inkjet recording head which concerns on the reference form of this invention in order from (A) to (G). It is a top view which shows the nozzle plate of the reference form of this invention. It is a top view which shows the nozzle plate of the inkjet recording head which concerns on embodiment of this invention. It is a top view which shows the nozzle plate of embodiment of this invention. It is a top view which shows the nozzle plate of embodiment of this invention. It is a top view which shows the nozzle plate of embodiment of this invention. It is a top view which shows the nozzle plate of embodiment of this invention. It is sectional drawing and a perspective view of the conventional inkjet recording head.

Explanation of symbols

10 Inkjet recording head (droplet ejection head)
12A Vertical convex part 12B Horizontal convex part 26 Nozzle 26A Nozzle row 60 Surrounding convex part 64 Convex part (medium convex part)
80 Protective convex part (first convex part)
82 Small convex part (second convex part)
84 Convex (first island convex)
85 Convex (Second Island Convex)
86 Inclined convex part 88 Annular convex part

Claims (2)

In a recording head having a nozzle row composed of a plurality of nozzles for discharging droplets,
  The droplet discharge surface on which the droplet is discharged has an inclined convex portion provided between the nozzles across the adjacent nozzle rows and in an oblique direction with respect to the nozzle rows. Discharge head. The nozzles provided in the nozzle row are arranged so as to be aligned in a direction orthogonal to the nozzle arrangement direction with respect to the nozzles provided in the adjacent nozzle row,
The said inclined convex part inclines in the diagonal direction across the adjacent nozzle row so that the nozzle with which the adjacent nozzle row was equipped may be shifted by one in the nozzle arrangement direction. Droplet discharge head.

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