JP2006082409A - Inkjet head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the occurrence of ink leakage when using an inkjet body again after replacing only an orifice plate. <P>SOLUTION: The inkjet head is composed by joining the orifice plate 3 and an ink channel member 1. A protruding part 5 made of an elastic material is formed around an exit of a channel being the orifice plate 3 joining face of the ink channel member 1 beforehand. When the orifice plate is joined to the ink channel member, the protruding part made of an elastic material is pressed and deformed, and then, the tightly fitted structure of the ink channel member and the orifice plate can be maintained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an ink jet recording head, and more particularly, to an attachable / detachable orifice plate technique for extending the life of an ink jet head.

  Inkjet heads, which have been widely used as consumer printers in the past, are all assemblies of precision parts that make full use of micro and sophisticated technologies and are manufactured through many processes. It was an expensive assembly part. However, when these ink jet heads are used to perform ink ejection for a long period of time, there is a problem in that some of the ink jet components are deteriorated and the ink jet heads cannot be used and must be discarded after reaching the end of their lives. .

  For example, in many inkjet heads, there is a type in which an orifice plate component having a large number of ejection openings for ejecting ink is bonded to an ink flow path outlet. In such an ink jet head, deterioration of the orifice plate has been a problem. That is, when ink is ejected for a long period of time, ink droplets adhere to the orifice plate surface, and the ink dries out, making it difficult to remove and the orifice plate surface becomes dirty. In addition, in order to remove the residual ink, the orifice plate surface may be wiped several times by a sponge-like recovery means, and the ink may be wiped by engulfing dry ink or fine dust. Scratches and deteriorates. Recently, in addition to consumer printer inks, various types of inks are used for industrial purposes, and depending on the type of ink, they cause a chemical reaction with the orifice plate material and gradually deteriorate. There is also a problem that the orifice plate itself is gradually dissolved and deteriorated.

  In order to solve the above problem, there has been a proposal that the entire inkjet head is not discarded when the orifice plate is deteriorated, only the orifice plate is replaced, and the inkjet main body is used again.

That is, in Patent Document 1, there is a proposal to prepare an orifice plate having a plurality of rows of ink ejection ports and replace the rows of the ink ejection ports sequentially.
Japanese Patent Application Laid-Open No. H10-228707 proposes that the orifice plate is closely attached to the ink channel outlet by suction and can be replaced.

Further, in Patent Document 3, there is a proposal that the orifice plate is pressed by a spring member to be exchangeable.
Japanese Patent Laid-Open No. 11-309860 JP 2002-67311 A JP 2003-211674 A

  However, in Patent Document 1 of the above-mentioned conventional example, the orifice plate is simply displaced on the ink flow path outlet surface of the ink jet main body, so that the sealing performance between the orifice plate and the ink flow path surface is insufficient, and the ink is not separated from the orifice plate. There was a problem of leakage from a gap with the ink flow path member. Further, since there is a possibility that the nozzle surface which has not been used yet will be wiped at the time of recovery, there has been a problem that the unused portion will be scratched at the time of repeated wiping.

  In Patent Document 2, the orifice plate is brought into close contact with the flow path member only by the suction force, and the nozzle ports each having a large number of holes having a diameter of about 10-50 μm are brought into close contact with each other. It is quite impossible to ensure precise adhesion with only a partial suction force, and there is a problem that pressure distribution naturally occurs at the joint between the flat surfaces, resulting in poor adhesion. Further, when ink leaks due to poor adhesion, the pressure at the time of ejection is not accurately transmitted to the ink droplets to be ejected, and there is a problem that ink ejection becomes unstable.

  Further, Patent Document 3 is an example applied to a case where there is one nozzle port, and there is a problem that ink leakage occurs only with spring pressure in a plurality of nozzles.

  In order to solve the above problems, the present invention provides an inkjet head configured by joining an orifice plate and an ink flow path member, around a flow path outlet that is an orifice plate joint surface of the ink flow path member. In addition, the elastic material convex portion is formed in advance, and when the orifice plate is joined to the ink flow path member, the elastic material convex portion is pressed and deformed, and the ink flow path member and the orifice plate maintain a close contact structure. It is an object of the present invention to provide a novel inkjet head configuration that enables a removable orifice plate that does not leak ink.

  According to the present invention, in an ink jet head configured by joining an orifice plate and an ink flow path member, an elastic material convex portion is formed in advance around a nozzle that is an ink flow path member joint surface of the orifice plate. When the orifice plate is joined to the ink flow path member, the elastic material convex portion is pressed and deformed, and the ink flow path member and the orifice plate maintain a close contact structure, so that there is no other ink leakage and is detachable. It is an object of the present invention to provide a novel inkjet head configuration that enables an orifice plate.

  The material of the elastic material projection may be any polymer resin material, for example, silicone resin, elastic epoxy resin, polyethylene resin, polypropylene resin, polyurethane resin, polyester resin, nylon resin, fluorine resin, poly Examples thereof include a vinyl acetate resin, a polyvinyl butyral resin, a rubber resin, and a mixture thereof. It is possible to apply or form a convex shape and a ring shape around the flow path outlet of the inkjet head or the nozzle opening of the orifice plate, and it is desirable that the cured product has an appropriate flexibility after being adhesively cured.

  In addition, if the polymer material is a cured silicone resin, it is possible to provide an adhesive structure with better confidentiality by utilizing the chemical resistance and appropriate flexibility of the silicone resin.

  As long as the ink flow path member is at least a part of the pressure generation chamber for ejecting ink, it is possible to simply replace the conventional orifice type adhesive plate of an inkjet head as it is with the present invention. . Here, the ink channel material may be any material as long as it is a piezoelectric material, and is usually made of piezoelectric ceramics, and is selected from materials such as lead zirconate titanate, lead titanate, and lead metaniobate. In addition, drive electrodes for generating pressure are appropriately disposed where necessary.

  The joint portion of the ink flow path member with the orifice plate has a positioning structure in advance, and the orifice plate side also has a corresponding positioning structure. When the orifice plate is joined to the ink flow path member, each positioning is performed. Providing a configuration that enables accurate alignment of the flow path center and the nozzle center by maintaining a structure in which the flow path center of the ink flow path member and the nozzle center of the orifice plate substantially coincide with each other by contacting the structure. To do. The positioning guide may be made of any material such as metal, ceramics, and plastic. For example, such as stainless steel and engineering plastic material, the accuracy of fitting with the orifice plate 3 is maintained, and the chemical does not deteriorate even when it comes into contact with ink. Those having high mechanical durability are preferred.

  The ink jet head main body including the ink flow path member has a pressing pressure structure for pressing the periphery of the nozzle opening of the orifice plate. It is possible to provide a novel inkjet head that can provide a detachable orifice plate that is highly reliable and free from ink leakage, with no variation in adhesion.

  The orifice plate has a concave portion at a position corresponding to the elastic material convex portion formed on the ink flow path member, and the elastic material convex portion of the ink flow path member and the concave portion of the orifice plate are fitted to maintain a close contact structure. As a result, the number of deformation contact surfaces of the convex portions can be increased, and thus a novel inkjet head that enables a more reliable removable orifice plate can be provided.

  The ink flow path member has a concave portion at a position corresponding to the elastic material convex portion formed on the orifice plate, and the elastic material convex portion of the orifice plate and the concave portion of the ink flow channel member are fitted to maintain a close contact structure. By this, even with another method, the deformation contact surface of the convex portion can be increased, and a highly reliable ink jet head can be provided.

  According to the present invention as described above, in an inkjet head configured by joining an orifice plate and an ink flow path member, around the flow path outlet which is the orifice plate joint surface of the ink flow path member in advance. An elastic material convex portion is formed, and when the orifice plate is joined to the ink flow path member, the elastic material convex portion is pressed and deformed, and the ink flow path member and the orifice plate maintain a close contact structure, thereby preventing ink leakage. Thus, a novel ink jet head capable of detachably attaching the orifice plate can be realized.

  Further, according to the present invention, in an ink jet head configured by joining an orifice plate and an ink flow path member, an elastic material projection is previously formed around the back surface of the nozzle port that is the ink flow path member joint surface of the orifice plate. When the orifice plate is joined to the ink flow path member, the convex portion of the elastic material is pressed and deformed, and the ink flow path member and the orifice plate maintain a close contact structure so that there is no ink leakage and the orifice plate Thus, a novel ink jet head that can be detachably mounted becomes possible.

  If the material of the elastic material convex portion of the present invention is a polymer material, it can be easily applied or molded around the flow path outlet of the ink jet head or the nozzle opening of the orifice plate.

  If the cured resin of the present invention is a cured silicone resin, the silicone resin is excellent in chemical resistance and therefore has long-term ink durability. In addition, since there is moderate flexibility, it is possible to provide a close contact structure with better confidentiality.

  If the ink flow path member of the present invention is a part of the pressure generating chamber, it is possible to simply replace the conventional adhesive type orifice plate of the ink jet head with that of the present invention as it is.

  By having a positioning structure at the junction between the ink flow path member and the orifice plate of the present invention, the flow path center of the ink flow path member and the nozzle center of the orifice plate are kept substantially coincident, thereby allowing accurate flow. It is possible to align the center of the path and the center of the nozzle.

  Since the ink flow path member of the present invention has a pressure structure, the convex portions are pressed and deformed to maintain the adhesion structure, so that there is no variation in the adhesion between the nozzles, and there is no ink leakage and highly reliable attachment / detachment. Allow possible orifice plates. Further, by releasing the pressing force of this pressing pressure structure, it is possible to easily replace the orifice plate with a new one.

  Since the orifice plate of the present invention has a concave portion, and the elastic material convex portion of the ink flow path member and the concave portion of the orifice plate are fitted together to maintain a close-contact structure, the deformed and close-contact surface of the convex portion can be increased, so that the reliability is further improved. Highly removable orifice plate is possible.

  According to the present invention, the ink flow path member has a concave portion, and the elastic material convex portion of the orifice plate and the concave portion of the ink flow channel member are fitted to maintain a close contact structure. This enables a highly reliable removable orifice plate.

Example 1
Hereinafter, the present invention will be described with reference to specific examples.

  A shear mode type piezo flow path member having an ink flow path of 100 × 80 μm, an ink flow path pitch of 450 μm, and also serving as an ink pressure generation chamber having 60 flow paths was prepared. FIG. 1 a is a side sectional view schematically showing only one flow path, and FIG. 1 b is a view of a flow path outlet surface. Reference numeral 1 denotes an ink flow path member, which is a piezoelectric ceramic material made of lead zirconate titanate. Reference numeral 2 denotes an ink flow path, and the lower side of FIG.

  Reference numeral 5 denotes an elastic material convex portion made of a silicone-based liquid gasket material (ThreeBond Co., Ltd., TB1215, viscosity 20 Pa · s, rubber hardness JISA 45). With a precise dispenser nozzle, the line width is 70 μm and the height is 40 μm. As shown in FIG. 1 b, it was applied in a square shape along the outlet shape of the flow path 2, and then cured by standing for 24 hours at a humidity of 70% and a temperature of 50 ° C.

  Next, as shown in FIG. 2, the nozzle 4 has a taper-shaped section having a thickness of 120 μm, a nozzle inlet diameter of Φ60 μm, and an outlet diameter of Φ30 μm, and has the same number of nozzles and pitch intervals as the number of channels of the channel member. An orifice plate 3 was prepared. The material is nickel and the surface is provided with a eutectoid plating film of nickel and fluorine resin having water repellency.

  Finally, as shown in FIG. 3, the flow path member 1 and the orifice plate 3 are aligned and brought into close contact with the pressing pressure 6 to obtain the ink jet head of the present invention.

  The above is a description of one flow path and one nozzle in order to explain the present invention in an easy-to-understand manner. FIGS. 7 and 8 are configuration examples for maintaining close contact between a large number of flow paths and a large number of nozzles for the entire inkjet head. In FIG. 8, since the elastic convex portion is deformed by the pressing pressure 6, even if there is some variation in the pressing pressure between the nozzles, the variation can be absorbed by the amount of deformation. Even in this case, it is possible to reliably maintain the close contact structure.

  The positioning method here is a method of fixing each part to the positioning stage and finely adjusting the stage while viewing a microscope observation image, a method of positioning using a reference surface or positioning pins (described later) Any method may be employed as long as it is a precision component positioning method.

  Further, the pressing pressure here is good enough to slightly deform the elastic material convex portion as shown in FIG. 3, and the pressure is determined from the cured material properties and shape of the elastic material convex material to be used and the number of channels. It is desirable. Further, it is preferable that the portion where the pressure should be applied is applied as uniformly as possible to the elastic convex portion. In other words, it is preferable to apply the operating portion as much as possible to the entire orifice plate and in the vicinity of the nozzle.

  In this embodiment, the ink flow path 1 is a shear mode type piezo flow path and also serves as a pressure generating chamber. FIG. 10 shows a schematic diagram of the channel outlet surface of an actual shear mode type piezo channel. Reference numeral 1 denotes an ink flow path member made of a piezoelectric material that is a piezoelectric element, 2 denotes an ink flow path, and 11 denotes an air chamber between the flow paths 2 for dividing the piezoelectric drive unit. Here, the elastic material convex portion 5 is formed in a portion sandwiched between the flow path 1 and the air chamber 11.

  In order to finally form the contact structure of the ink flow path member 1 and the orifice plate 3 as an ink jet head, a common ink chamber is formed on the flow path entrance surface side of the ink flow path 1 as shown in FIG. The manifold 7 having the ink inlet 8 and the ink outlet 9 is bonded and fixed. Ink droplets 10 can be ejected by supplying ink in the direction of the arrow from the ink inlet 8 side and applying a driving voltage to the pressure generating chamber. At this time, the ink flow path 1 and the orifice plate 3 are kept in close contact with each other by the elastic material projections 5, so that there is no ink leakage.

(Example 2)
Next, another configuration of the present invention will be described.

  A flow path member 1 similar to that in Example 1 as shown in FIG. 4 was prepared. Next, the same orifice plate 3 as in Example 1 as shown in FIG. 5 was prepared. Further, as shown in FIGS. 5A and 5B, the same material as in Example 1 was applied in a circular shape along the periphery of the inlet of the nozzle 4 of the orifice plate 3, and then the humidity was 70%, the temperature was 50 ° C., and 24 hours. The elastic material convex part 5 with a line width of 70 μm and a height of 40 μm was formed by curing by standing.

  Finally, as shown in FIG. 6, the flow path member 1 and the orifice plate 3 are aligned and brought into close contact with the pressing pressure 6 to obtain the ink jet head of the present invention. Thus, even if the elastic material convex portion 5 is provided on the orifice plate side, the close contact structure of the present invention can be maintained.

(Example 3)
Next, a specific configuration of the positioning structure of the ink flow path member 1 and the orifice plate 3 according to the present invention will be described.

  A flow channel member 1 similar to that of Example 1 as shown in FIG. 11 is prepared, and a pair of positioning guides 12 (stainless steel, SUS304) was adhered and fixed. Next, an orifice plate 3 similar to that of the first embodiment as shown in FIG. 11 is prepared, and further, the same material as that of the first embodiment is used as shown in 5 of FIG. After coating in a rectangular shape along the periphery, the elastic material convex part 5 having a line width of 70 μm and a height of 40 μm was formed by curing by standing for 24 hours at a humidity of 70%, a temperature of 50 ° C.

  As shown in FIG. 12 later, the orifice plate 3 was fixed by fitting with the positioning guide 12 of the flow path member 1 and brought into close contact with the pressing pressure 6 to obtain the ink jet head of the present invention. If the positioning guide 12 is provided on the ink flow path member in this way, the orifice plate 3 can be easily positioned and fixed with high accuracy to maintain a close contact structure.

Example 4
Next, a specific configuration of another positioning structure for the ink flow path member 1 and the orifice plate 3 according to the present invention will be described.

  The nozzle portion as shown in FIG. 13 is the same as that of Example 1, but the orifice plate 3 having the positioning holes 14 of Φ500 μm at both ends of the orifice plate 3 where the nozzle is not formed. Next, a flow path member 1 similar to that of Example 1 was prepared, and a pair of tapers having a tip diameter of Φ420 μms and a root diameter of Φ500 μm corresponding to the positions of the positioning holes 14 of the orifice plate 3 at both ends of the flow path outlet surface. A shape positioning pin 13 (stainless steel, SUS304) was adhered and fixed. Next, as shown in 5 of FIG. 13, the same material as in Example 1 was applied in a square shape along the periphery of the outlet of the flow path 2 of the ink flow path member 1, and then the humidity was 70% and the temperature was 50 ° C. Then, the elastic material convex part 5 having a line width of 70 μm and a height of 40 μm was formed by curing by standing for 24 hours.

  Finally, as shown in FIG. 14, the positioning pin 13 of the flow path member 1 is fitted and fixed in the positioning hole 14 of the orifice plate 3, and is brought into close contact with the pressing force 6 to obtain the ink jet head of the present invention. Thus, if the positioning pin 13 and the positioning hole 14 are provided in the ink flow path member and the orifice plate, the orifice plate 3 can be easily positioned and fixed with high accuracy to maintain a close contact structure.

(Example 5)
Next, a specific configuration of the pressing structure according to the present invention will be described.

  A flow path member 1 similar to that of Example 1 as shown in FIG. 15 was prepared, and spring fixing members 17 having metal spring hook holes on both side surfaces thereof were positioned and fixed in advance with an epoxy adhesive. Next, one end of the spring-like pressing pressure spring 16 was hung on each spring fixing member 17 and the other end was hung on the pressing pressure member 15 to produce the pressing pressure structure member of the present invention. The pressing member 15 is made of stainless steel and has a shape surrounding the ink flow path member 1.

  Next, an orifice plate 3 similar to that in Example 1 as shown in FIG. 15 was prepared. Subsequently, as shown in 5 of FIG. 15, the same material as in Example 1 was applied in a square shape along the periphery of the outlet of the flow path 2 of the ink flow path member 1, and then the humidity was 70% and the temperature was 50 ° C. Then, the elastic material convex part 5 having a line width of 70 μm and a height of 40 μm was formed by curing by standing for 24 hours.

  Finally, as shown in FIG. 16, the pressure spring 16 is extended and the pressure member 15 is lifted up once, and then the orifice plate 3 is fitted under the pressure member 15 to contract the spring, so that the spring is tightly attached. An inkjet head of the present invention was obtained. If the pressure member 15 having a spring structure is provided in the ink flow path member 1 in this way, the orifice plate 3 can be easily fixed to maintain the close contact structure.

  Further, it was confirmed that the spring pressure of the pressing member 15 was released, the orifice plate 3 was removed, and another orifice plate 3 was attached, so that it could be removed any number of times.

(Example 6)
Hereinafter, another specific configuration of the close contact structure portion of the present invention will be described.

  The elastic convex part 5 was formed with the material and shape similar to Example 1 on the flow-path exit surface of the ink flow-path member 1 similar to Example 1, and the ink flow-path member of FIG. 17a was created. Next, as shown in FIG. 17b, two ring-shaped protrusions (by a nickel electroforming method using a resist mask are formed on the opposing surface on the orifice plate 3 side where the elastic material protrusion 5 of the ink flow path member 1 comes into contact. 20 μm in height and 40 μm in width). This means that an orifice plate in which a concave portion 18 composed of two convex portions is formed.

  Next, as shown in FIG. 18, the ink flow path member 1 and the orifice plate 3 having the recesses 18 were brought into close contact with each other by the pressing pressure 6 to obtain the ink jet head of the present invention. Thus, if a recessed part is formed in the opposing surface of the orifice plate 3, it is possible to increase the deformation area of an elastic convex part by pushing pressure, and to maintain the structure with more excellent adhesiveness.

(Example 7)
The elastic convex part 5 was formed with the material and shape similar to Example 1 on the flow-path exit surface of the ink flow-path member 1 similar to Example 1, and the ink flow-path member of FIG. 17a was created. Next, a ring-shaped concave portion (depth 20 μm, width) is formed on the opposite surface on the orifice plate 3 side where the elastic material convex portion 5 of the ink flow path member 1 as shown in FIG. 40 μm) 19 was formed.

  Next, as shown in FIG. 19, the ink flow path member 1 and the orifice plate 3 having the concave portion 19 were brought into close contact with each other by the pressing pressure 6 to obtain the ink jet head of the present invention. Thus, if a recessed part is formed in the opposing surface of the orifice plate 3, the deformation area of an elastic convex part will increase and it will be possible to maintain the structure with more excellent adhesiveness.

(Example 8)
An orifice plate 3 having elastic convex portions 5 as shown in FIG. Next, two quadrangular convex portions (height: 20 μm, width: 40 μm) as shown in FIG. 20a are formed on the outlet surface of the ink flow path member 1 at positions facing the elastic convex portions 5 of the orifice plate 3. Formed. As a forming method, first, a thin film electrode was vacuum-deposited on the outlet face of the flow path, a resist mask was applied thereon, and an electrode was used to form a nickel electroforming method using the mask. And the ink flow path member 1 which has the recessed part 20 formed of these two convex parts was created.

  Next, as shown in FIG. 21, the ink flow path member 1 having the recess 20 and the orifice plate 3 were brought into close contact with the pressing force 6 to obtain the ink jet head of the present invention. Thus, if the recessed part is formed in the flow-path member 1, the deformation area of an elastic convex part will increase and it will be possible to maintain the structure which was more excellent in adhesiveness.

Example 9
An orifice plate 3 having elastic convex portions 5 as shown in FIG. Next, a concave portion (depth 20 μm, width 40 μm) 21 as shown in FIG. 20 b was formed on the flow path outlet surface of the ink flow path member 1 at a position facing the elastic convex portion 5 of the orifice plate 3. As a method, formation was performed using a dry etching method.

  Next, as shown in FIG. 22, the ink flow path member 1 having the recess 21 and the orifice plate 3 were brought into close contact with each other by the pressing pressure 6 to obtain the ink jet head of the present invention. Thus, if the recessed part is formed in the flow-path member 1, the deformation area of an elastic convex part will increase and it will be possible to maintain the structure which was more excellent in adhesiveness.

The flow path member in which the elastic material convex part of the present invention is formed Orifice plate Inkjet head of the present invention Channel member Orifice plate on which elastic material convex portions of the present invention are formed Inkjet head of the present invention Flow path member and orifice plate on which elastic material convex portion of the present invention is formed Inkjet head of the present invention Inkjet head of the present invention The flow path member in which the elastic material convex part of the present invention is formed The figure which shows the positioning structure of the flow-path member of this invention The figure which shows the positioning structure of the flow-path member of this invention The figure which shows the positioning structure of the flow-path member of this invention The figure which shows the positioning structure of the flow-path member of this invention The figure which shows the pressing structure of this invention The figure which shows the pressing structure of this invention Channel member and orifice plate recess of the present invention Fitting diagram using orifice plate recess of the present invention Fitting diagram using orifice plate recess of the present invention Orifice plate and channel member recess of the present invention Fitting diagram using the channel member recess of the present invention Fitting diagram using the channel member recess of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ink flow path member 2 Ink flow path 3 Orifice plate 4 Nozzle 5 Elastic material convex part 6 Pushing pressure 7 Manifold 8 Ink inlet 9 Ink outlet 10 Ink droplet 11 Air chamber 12 Positioning guide 13 Positioning pin 14 Positioning hole 15 Pressing pressure member 16 Pressure spring 17 Spring fixing member 18 Orifice plate recess 19 Orifice plate recess 20 Channel member recess 21 Channel member recess 22 Adhesive

Claims (9)

  In an ink jet head configured by joining an orifice plate and an ink flow path member, an elastic material convex portion is formed in advance around a flow path outlet that is an orifice plate joint surface of the ink flow path member, An ink jet head characterized in that when the orifice plate is joined to the ink flow path member, the elastic material convex portion is pressed and deformed, and the ink flow path member and the orifice plate maintain a close contact structure.   In an ink jet head configured by joining an orifice plate and an ink flow path member, an elastic material convex portion is formed in advance around a nozzle that is an ink flow path member joint surface of the orifice plate. The ink jet head is characterized in that the elastic material convex portion is pressed and deformed when joining the ink flow path member to the ink flow path member, and the ink flow path member and the orifice plate maintain a close contact structure.   The ink jet head according to claim 1, wherein the elastic material convex portion is a polymer material.   4. The ink jet head according to claim 3, wherein the polymer material is a cured silicone resin.   An ink jet head according to claim 1, wherein the ink flow path member is at least a part of a pressure generating chamber for discharging ink.   The joint portion of the ink flow path member of the first and second aspects with the orifice plate has a positioning structure in advance, and has a corresponding positioning structure on the orifice plate side, and joins the orifice plate to the ink flow path member. In this case, the ink jet head is characterized in that a structure in which the flow path center of the ink flow path member and the nozzle center of the orifice plate substantially coincide with each other by contacting each positioning structure.   An inkjet head main body including the ink flow path member according to claim 1 or 2 has a pressing structure for pressing around the nozzle opening of the orifice plate.   The orifice plate according to claim 1 has a concave portion at a position corresponding to the elastic material convex portion formed on the ink flow path member, and the elastic material convex portion of the ink flow path member and the concave portion of the orifice plate are fitted and closely adhered. An ink jet head characterized by maintaining a structure.   The ink flow path member according to claim 2 has a concave portion at a position corresponding to the convex portion of the elastic material formed on the orifice plate, and the elastic material convex portion of the orifice plate and the concave portion of the ink flow channel member are fitted to closely contact each other. An ink jet head characterized by maintaining a structure.

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