JP2009184290A - Ink-jet head, ink-jet recording device and manufacturing method of ink-jet head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink-jet head, which can compactly and positioningly be housed to a carriage and the number of positioning faces provided on the carriage fixed thereto is reduced. <P>SOLUTION: In a plurality of ink-jet heads 9, each of which is equipped with a nozzle plate 19 having a plurality of ink jetting holes 19a arranged in one direction L1 and with base plates 20 and 21 supporting the nozzle plate is such a manner that a plurality of its ink jetting holes face opposite to a recording medium and which are installed on a carriage 28 drivable towards a scanning direction L2 normal to one direction L1 towards the scanning direction L2, at respectively opposing surfaces S1 and S2 in base plates adjoining to each other in the scanning direction L2, a pair of projecting parts 21a at both the ends in one direction L1 of one opposing surface and a pair of planar parts 21b at both the ends in one direction L1 of the other opposing surface are respectively provided so as to abut the projecting parts and the planar parts against each other in the scanning direction L2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an inkjet head, an inkjet recording apparatus, and a method for manufacturing an inkjet head.

In an inkjet head of a conventional inkjet recording apparatus, various structures have been studied in order to fix a plurality of inkjet heads that eject ink in parallel with a carriage.
As one of the fixing structures, there is known a structure in which a head case (inkjet head) is fixed to a plurality of through portions arranged in parallel on one side of a fixing member (carriage) (see, for example, Patent Document 1). .
Further, as another fixing structure, there is one in which the position where the print head module (inkjet head) is fixed is controlled by a pattern shape formed alternately on both sides of a block-shaped print bar (carriage) (for example, Patent Document 2). reference).
As another fixing structure, the recording head support member is fixed to one side of a block-shaped carriage, and the recording head unit is attached to the recording head support member so that the recording head unit (inkjet head) is inclined with respect to the carriage. A method of mounting is known (for example, see Patent Document 3).
JP 2001-162811 A Japanese Patent Laid-Open No. 5-27099 Japanese Patent Laid-Open No. 7-81049

However, in the head case described in Patent Document 1, the head case is fixed to the carriage by bringing the head case into contact with the penetrating portion of the fixing member. For this reason, it is necessary to set a wide gap between the head cases, and the size of the carriage in the direction in which the head cases are arranged side by side is large. As a result, the carriage was large. In addition, since the plurality of head cases are respectively positioned on the carriage, the number of finished surfaces for positioning the carriage is increased.
Also for the print head module described in Patent Document 2, since the position where the print head module is fixed is controlled by the pattern shape formed on the print bar, it is necessary to set a wide gap between the print head modules. Also for the recording head unit described in Patent Document 3, since the recording head unit is fixed to the recording head support member fixed to the carriage, it is necessary to set a wide gap between the recording head units.

  The present invention has been made in view of such problems, and is an inkjet head that can be compactly positioned and accommodated in a carriage and has a reduced number of positioning surfaces provided on a fixed carriage, An inkjet recording apparatus on which an inkjet head is mounted and an inkjet head manufacturing method are provided.

In order to solve the above problems, the present invention proposes the following means.
The inkjet head of the present invention includes a nozzle plate having a plurality of ink ejection holes arranged in one direction, and a base plate that supports the nozzle plate such that the plurality of ink ejection holes face a recording medium, A plurality of ink jet heads mounted side by side in the scanning direction on a carriage supported so as to be drivable in a scanning direction orthogonal to one direction, the opposing surfaces of the base plates adjacent to each other in the scanning direction, In a plan view of the base plate as viewed from the side where the ink ejection holes are opened, a pair of protrusions are provided at both ends in one direction of one of the opposing surfaces, and a pair is provided at both ends in one direction of the other opposing surface. Are provided so that the protruding portion and the flat portion are abutted with each other in the scanning direction. It is set to.

According to this invention, the base plate adjacent in the scanning direction is positioned in the scanning direction by the pair of protrusions provided at both ends in one direction of one facing surface and the both ends in one direction of the other facing surface. It can carry out by a pair of plane part provided in.
Since the ink jet head includes the base plate, the ink jet heads that are adjacent to each other in the scanning direction can be positioned in the scanning direction by bringing the ink jet heads into contact with each other. Accordingly, since the ink jet heads can be positioned and mounted on the carriage with a close interval, the ink jet heads can be compactly positioned and accommodated in the carriage.
In addition, since each of the opposing surfaces of the base plates facing each other is provided with a protruding portion and a flat portion at both ends in one direction, the inkjet head can be positioned while preventing rattling in the scanning direction. it can.
In addition, since the adjacent inkjet heads can be positioned in the scanning direction by bringing the inkjet heads into contact with each other, the number of positioning surfaces provided on the carriage can be reduced.

Further, it is more preferable that the protruding portion and the flat portion are provided on the ink ejection hole side of the base plate.
According to this invention, positioning of the inkjet heads in the scanning direction can be performed at a location close to the ink ejection holes. Accordingly, the position adjustment of the ink ejection holes can be easily performed.

More preferably, the flat portion is a flat surface recessed from the facing surface.
According to the present invention, the projecting portion and the flat surface portion that is a concave plane are brought into contact with each other in the scanning direction, so that the projecting portion is positioned so as to enter the recessed flat surface portion. Therefore, a plurality of inkjet heads can be arranged more compactly in the scanning direction and accommodated in the carriage.

Moreover, it is more preferable that the ink jet recording apparatus of the present invention is equipped with the ink jet head described above.
According to the present invention, since the ink jet head can be arranged more compactly in the scanning direction and accommodated in the carriage, the ink jet recording apparatus equipped with the ink jet head can be made smaller as a whole.

  Moreover, the manufacturing method of the inkjet head of this invention is a manufacturing method of the inkjet head which manufactures one of said inkjet heads, Comprising: The said nozzle plate is fixed to the said base plate, and the said inkjet head is formed in multiple numbers. A pair of imaginary lines specifying a first imaginary line passing through each ink ejection hole located at both ends of the one direction among the plurality of ink ejection holes for each of the inkjet heads; The protrusion is removed so that a second imaginary line passing through the tip of the protrusion is parallel to the first imaginary line, and a third imaginary line passing through the tip surfaces of the pair of flat portions is And a processing step of removing the planar portion so as to be parallel to the first imaginary line.

According to the present invention, after the nozzle plate is fixed to the base plate in the forming step, each of the ink jets positioned at both ends in one direction among the plurality of ink jet holes for each of the ink jet heads in the virtual line specifying step. A first imaginary line through the hole is identified.
And in a processing process, while removing a projection part so that the 2nd imaginary line which passes along the tip of a pair of projection parts may become parallel to the 1st imaginary line, the 3rd which passes along the tip surface of a pair of plane parts The plane portion is removed so that the virtual line is parallel to the first virtual line.
Further, the ink jet head processed as described above is moved in such a manner that the pair of projecting portions and the pair of flat portions provided on the base plate provided in each ink jet head adjacent in the scanning direction abut each other. To be installed. Accordingly, the direction of the first imaginary line of the plurality of inkjet heads mounted on the carriage, that is, the direction in which the plurality of ink ejection holes are arranged can be adjusted in parallel.

  According to the ink jet head of the present invention, it is possible to position and accommodate the carriage in a compact manner, and to reduce the number of positioning surfaces provided on the carriage to be fixed. Further, according to the ink jet recording apparatus of the present invention, the entire apparatus can be made smaller. According to the method of manufacturing an ink jet head of the present invention, the ink jet head can be accommodated in the carriage in a compact manner by adjusting the direction in which the ink ejection holes of the ink jet head mounted on the carriage are arranged in parallel.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 8 are explanatory diagrams of an ink jet recording apparatus according to an embodiment of the present invention. 1 is a perspective view of the whole, and FIG. 2 is a perspective view of a main part in FIG.
In the present embodiment, an ink jet printer will be described as an example of an ink jet recording apparatus.

As shown in FIGS. 1 and 2, the ink jet printer 1 of the present embodiment has a head block 2 provided with a plurality of ink jet heads 9 that eject ink W of different colors and a recording paper P in advance. A transport unit 3 that transports the recording paper P in the transport direction L1 and a moving unit 4 that reciprocally moves a head chip 11 (to be described later) of the head block 2 in a scanning direction L2 orthogonal to the transport direction L1. The head chip 11 is moved in the scanning direction L2 while being conveyed to L1, and characters, figures, and the like are recorded on the recording paper P.
Note that the recording paper P corresponds to the recording medium of the claims, and may be a cut paper, a continuous paper, a slip, or the like. The transport direction L1 corresponds to one direction of the claims.
In the illustrated example, the case where four inkjet heads 9 are provided and black, cyan, magenta, and yellow ink W is ejected is taken as an example. The four inkjet heads 9 have the same configuration.

The head block 2 includes a carriage 28 supported by the moving unit 4 so as to be drivable in the scanning direction L2, and a plurality of ink jet heads 9 mounted on the carriage 28 side by side in the scanning direction L2.
The four inkjet heads 9 are positioned by a method described later while being arranged in the scanning direction L2 on the carriage 28, and are fixed to a pair of bosses 28a formed on the carriage 28 by fixing screws 29. A supply tube 41 that supplies ink W from the ink tank 43 is connected to each inkjet head 9. The supply tube 41 is a long and flexible tube made of a soft material so as not to hinder the movement of the inkjet head 9 by the carriage 28.

The carriage 28 is disposed on a pair of guide rails 44 extending on the base 40 along the scanning direction L2 so as to be movable in the scanning direction L2, and is also disposed at a distance in the scanning direction L2. It is connected to the conveyor belt 46 wound around the pulley 45.
The carriage 28 is formed with a mounting hole 28c for fixing the ink jet head 9. A first positioning surface 28d and a second positioning surface 28e used for positioning the inkjet head 9 are provided so as to surround the attachment hole 28c. The first positioning surface 28d is disposed perpendicular to the transport direction L1, and the second positioning surface 28e is disposed perpendicular to the scanning direction L2.

Of the pair of pulleys 45, one pulley 45 is rotated by receiving a rotational driving force from a driving motor 47 fixed to the base 40.
Thereby, the carriage 28 can reciprocate along the scanning direction L2. That is, the pair of guide rails 44, the pair of pulleys 45, the conveyance belt 46, and the drive motor 47 constitute the moving unit 4.

  In addition, the base 40 is provided with two pairs of a pair of transport rollers 48 having an axis extending along the scanning direction L2 with an interval in the transport direction L1. A pair of guide rails 44 is disposed between the two sets of transport rollers 48. The pair of transport rollers 48 are arranged such that their axes are spaced from each other in the ejection direction L3 perpendicular to both the transport direction L1 and the scanning direction L2, and between the pair of transport rollers 48. The recording paper P is sandwiched.

  The pair of transport rollers 48 are supported by motors (not shown) so as to rotate in opposite directions around the respective axes, and the recording paper P sandwiched between the transport rollers 48 is moved in the transport direction L1. It is designed to be transported. That is, the pair of transport rollers 48 constitutes the transport unit 3.

3 is a cross-sectional view taken along a cutting line AA in FIG. 2, and FIG. 4 is a view in the direction of arrow B of the inkjet head 9 in FIG.
Note that the shape shown in FIG. 4 is a plan view of the nozzle cap 21 as viewed from the side where the ink ejection holes 19a described later are opened.
2 and 3, the inkjet head 9 includes a head chip unit 10, a nozzle plate 19, a base plate 20, a nozzle cap 21, an ink flow path member 23, a filter 24, and a damper 25. I have.
The head chip unit 10 includes a control board 15, a head chip 11 that ejects ink W toward the recording paper P in response to a signal from the control board 15, and a flexible circuit that electrically connects the control board 15 and the head chip 11. And a printed wiring (FPC) 16.

As shown in FIG. 4, the nozzle plate 19 has a plurality of ink ejection holes 19 a that eject the ink W. Further, the nozzle cap 21 supports the nozzle plate 19 so that the plurality of ink ejection holes 19a face the recording paper P in the ejection direction L3 and are arranged in the transport direction L1.
Further, the base plate 20 and the nozzle cap 21 shown in FIG. 3 are each formed by casting or the like using an aluminum alloy as a material.
The base plate 20 and the nozzle cap 21 correspond to the base plate in the claims. In the present embodiment, the base plate 20 and the nozzle cap 21 are separate components, but the base plate 20 and the nozzle cap 21 may be formed integrally to form the base plate 20.

As shown in FIGS. 2 and 3, the damper 25 relaxes the inertia force generated by the movement of the head chip 11 between the supply tube 41 that supplies the ink W to the inkjet head 9 and the ink flow path member 23. It is connected to the. The damper 25 is fixed to the base plate 20.
Further, the ink flow path member 23 is injection-molded with a synthetic resin to form a connection portion (not shown) to which the damper 25 is connected, and guides the ink W supplied from the damper 25 to the head chip 11.
In addition, a filter 24 that filters the ink W that has flowed through the damper 25 is attached to the ink flow path member 23. The filter 24 has a mesh shape with a plurality of fine openings, and removes foreign matters of a predetermined size or more contained in the ink W.

  The base plate 20 and the nozzle cap 21 are bonded and fixed with an adhesive (not shown). Similarly, the base plate 20 and the head chip 11, and the nozzle cap 21 and the nozzle plate 19 are also bonded and fixed by an adhesive.

As shown in FIG. 4, in each of the facing surfaces S1 and S2 facing each other in the nozzle caps 21 adjacent in the scanning direction L2, a pair of protruding portions 21a are provided at both ends in the transport direction L1 of the one facing surface S1. A pair of flat surface portions 21b are provided at both ends of the opposite surface S2 in the transport direction L1 so that the protruding portions 21a and the flat surface portions 21b face each other in the scanning direction L2. As shown in FIG. 3, the protruding portion 21 a and the flat portion 21 b are provided on the nozzle cap 21 on the ink ejection hole 19 a side.
Further, as shown in FIG. 4, a positioning portion 21e having the same shape as the protruding portion 21a is provided on the surface of the carriage 28 of the nozzle cap 21 on the first positioning surface 28d side so as to face the first positioning surface 28d. ing. A pair of U-shaped portions 21 f for fixing the nozzle cap 21 to the carriage 28 are formed at both ends of the nozzle cap 21.
In addition, the protrusion part 21a, the plane part 21b, and the positioning part 21e are integrally molded with the nozzle cap 21 and made of aluminum alloy or the like as a material.

Here, as for the shape of the protrusion part 21a in this embodiment, a cross section becomes square shape, and the cross section becomes small as it goes to the front-end | tip 21c of a protrusion part. For this reason, the process of the front-end | tip 21c of a protrusion part can be performed easily. In addition, as long as this protrusion part 21a is a shape where the cross section becomes small as it goes to the front-end | tip 21c, the shape of a cross section may be triangular shape, circular shape, etc.
The flat surface portion 21b is a flat surface that protrudes from the facing surface S2, and a front end surface 21d is provided at a portion that abuts on the front end 21c of the protruding portion.

As will be described later, in order to adjust the direction in which the ink ejection holes 19a are arranged, a process of removing the tip 21c of the protruding portion of the nozzle cap 21 and the tip surface 21d of the flat portion is performed.
For this reason, the front end surface 21d of the flat surface portion and the front end 21c of the protrusion portion are reliably brought into contact with each other even if the positions of the protruding portion 21a and the flat surface portion 21b are slightly shifted on the opposing surfaces S1 and S2 adjacent in the scanning direction L2. Thus, the width of the front end surface 21d of the flat portion is set. That is, since the protrusion 21a hardly deviates in the injection direction L3 with respect to the flat part 21b, it is not necessary to set the width of the flat part 21b in the injection direction L3 wide. On the other hand, the width of the flat surface portion 21b in the scanning direction L2 is set to a predetermined width so as to surely abut against the protruding portion 21a.
Further, the inner diameter of the U-shaped portion 21f is set larger than the diameter of the screw portion of the fixing screw 29 so that the U-shaped portion 21f can be fixed to the boss 28a even if the position of the nozzle cap 21 with respect to the carriage 28 is slightly shifted. .

Next, a process for manufacturing the ink jet head of this embodiment will be described. FIG. 5 is a flowchart showing the manufacturing process of the inkjet head. In addition, when demonstrating and distinguishing several inkjet heads 9, it attaches | subjects a code | symbol like the inkjet heads 9a, 9b, 9c, and 9d for convenience.
First, in the forming step (step S11), the base plate 20 and the nozzle cap 21 are fixed with an adhesive. A plurality of inkjet heads 9 are formed by fixing the head chip 11, the nozzle plate 19, and the like to the base plate 20 and the nozzle cap 21 that are fixed.
Next, in the imaginary line specifying step (step S12), as shown in FIG. 6, the ink ejection holes 19a located at both ends in the transport direction L1 among the plurality of ink ejection holes 19a are provided for each of the inkjet heads 9. The first virtual line C1 that passes through is specified.
Specifically, the step of specifying the first virtual line C1 is performed by fixing the surface of the inkjet head 9 on which the ink ejection holes 19a are formed on an XY table.

Next, in the processing step (step S13), as shown in FIG. 7, the protruding portion 21a is set so that the second imaginary line C2 passing through the distal ends 21c of the pair of protruding portions is parallel to the first imaginary line C1. While removing, the plane part 21b is removed so that the 3rd virtual line C3 which passes along the front end surface 21d of a pair of plane part may become in parallel with the 1st virtual line C1.
Specifically, a virtual surface M that is perpendicular to the surface of the nozzle plate 19 on which the ink ejection holes 19a are formed and includes the first virtual line C1 is specified. The end mill is arranged so that the surface on which the ink ejection holes 19a are formed and the axis of rotation of the end mill are orthogonal to each other. Further, the inkjet head 9 on the XY table is moved so that the distance between the identified virtual surface M and the end mill is constant, and the tip 21c of the pair of protrusions and the tip surface 21d of the pair of flat portions are deleted by the end mill. .

Finally, in the mounting process (step S14), a plurality of inkjet heads 9 are mounted on the carriage 28 as shown in FIG.
Specifically, first, the first inkjet head 9a is abutted against the second positioning surface 28e of the carriage 28 with the tips 21c of the pair of protruding portions, and the positioning portion 21e is abutted against the first positioning surface 28d. The ink jet head 9 a is positioned with respect to the carriage 28.
Then, the U-shaped portion 21 f formed on the nozzle cap 21 is fixed to a boss 28 a formed on the carriage 28 with a fixing screw 29, thereby fixing the inkjet head 9 a to the carriage 28.
Next, the second inkjet head 9b is abutted against the distal end surface 21d of the flat surface portion of the first inkjet head 9a while the positioning portion 21e is brought into contact with the first positioning surface 28d. The ink jet head 9b is positioned with respect to the carriage 28 by abutting. Then, the U-shaped portion 21 f formed on the nozzle cap 21 is fixed to a boss 28 a formed on the carriage 28 with a fixing screw 29, thereby fixing the inkjet head 9 b to the carriage 28.
The third and fourth inkjet heads 9c and 9d are positioned in the same process as the inkjet head 9b and then fixed to the carriage 28. In this way, the inkjet mounted on the carriage 28 The direction of the first virtual line C1 of the heads 9a, 9b, 9c, 9d, that is, the direction in which the plurality of ink ejection holes 19a are arranged can be adjusted to be parallel to the transport direction L1.

Thus, according to the ink jet printer of the embodiment of the present invention, the positioning in the scanning direction L2 between the nozzle caps 21 adjacent in the scanning direction L2 is performed at a pair of both ends of the opposite surface S1 in the transport direction L1. This can be performed by the protruding portion 21a and a pair of flat surface portions 21b provided at both ends of the other facing surface S2 in the transport direction L1.
Since the inkjet head 9 includes the nozzle cap 21, it is possible to position the inkjet heads 9 adjacent to each other in the scanning direction L2 in the scanning direction L2 by abutting the inkjet heads 9 together. Accordingly, since the ink jet heads 9 can be positioned and mounted on the carriage 28 with a small space between them, the ink jet head 9 can be compactly positioned and accommodated in the carriage 28.
Further, in each of the facing surfaces S1 and S2 facing each other in the nozzle cap 21, the protruding portion 21a and the flat portion 21b are provided at both end portions in the transport direction L1, respectively, thus preventing rattling in the scanning direction L2. Thus, the inkjet head 9 can be positioned.
In addition, since the adjacent inkjet heads 9 can be positioned in the scanning direction L2 by abutting the inkjet heads 9 with each other, the number of positioning surfaces provided on the carriage 28 can be reduced. In the present embodiment, the number of positioning surfaces is two, that is, the first positioning surface 28d and the second positioning surface 28e.

Further, the protruding portion 21 a and the flat portion 21 b are provided on the ink ejection hole 19 a side of the nozzle cap 21. Thereby, positioning of the inkjet heads 9 in the scanning direction L2 can be performed at a location close to the ink ejection holes 19a. Accordingly, the position adjustment of the ink ejection holes 19a can be easily performed.
Moreover, since the front end surface 21d is provided on the flat surface portion 21b, the front end 21c of the protruding portion and the flat surface portion 21b can be reliably abutted.
Further, since the ink jet printer 1 is equipped with the ink jet head 9 as described above, the ink jet head 9 can be compactly arranged in the scanning direction L2 and accommodated in the carriage 28. For this reason, it becomes possible to make the inkjet printer 1 equipped with the inkjet head 9 smaller as a whole.

In the above embodiment, the flat portion 21b of the nozzle cap 21 is a flat surface that protrudes from the facing surface S2. However, as shown in FIG. 9, the plane portion 21b may be a plane that is recessed from the facing surface S2.
In this case, the projecting portion 21a and the recessed flat surface portion 21b are brought into contact with each other in the scanning direction L2, so that the projecting portion 21a is positioned so as to enter the recessed flat surface portion 21b. Accordingly, a plurality of inkjet heads 9 can be arranged in a compact manner in the scanning direction L2 and accommodated in the carriage 28.

Moreover, in the said embodiment, a pair of protrusion part 21a is located in the both ends of the conveyance direction L1 of one opposing surface S1 of one nozzle cap 21, and a pair of plane part is located in the both ends of the conveyance direction L1 of the other opposing surface S2. 21b is provided so that the protruding portion 21a and the flat surface portion 21b face each other in the scanning direction L2.
However, as shown in FIG. 10, the nozzle cap 21 in which only the protruding portions 21a are provided on the opposing surfaces S1 and S2 and the nozzle cap 21 in which only the flat surface portion 21b is provided on the opposing surfaces S1 and S2 are alternately arranged on the carriage 28. You may arrange.
Even if comprised in this way, there can exist an effect similar to the said embodiment.

  Moreover, in the said embodiment, the protrusion part 21a and the plane part 21b were provided in the opposing surfaces S1 and S2 of the nozzle cap 21, and the scanning direction L2 of the inkjet heads 9 was positioned. However, the protruding portion 21a and the flat portion 21b may be provided on the base plate 20 to position the inkjet heads 9 in the scanning direction L2.

In the above embodiment, the protruding portion 21 a and the flat portion 21 b are provided on the ink ejection hole 19 a side of the nozzle cap 21. However, the protruding portion 21 a and the flat portion 21 b may be provided on the opposite side of the nozzle cap 21 from the ink ejection hole 19 a.
This is because even in this case, the position of the ink ejection hole 19a can be adjusted by reliably positioning the protrusion 21a and the flat portion 21b.

1 is a perspective view of an inkjet printer according to an embodiment of the present invention. It is the principal part perspective view which fractured | ruptured some ink jet printers of embodiment of this invention. FIG. 3 is a cross-sectional view taken along a cutting line AA in FIG. 2. It is a B direction arrow directional view of the inkjet head in FIG. It is a flowchart which shows the manufacturing process of the inkjet head of the inkjet printer of embodiment of this invention. It is explanatory drawing which shows the manufacturing process of the inkjet head of the inkjet printer of embodiment of this invention. It is explanatory drawing which shows the manufacturing process of the inkjet head of the inkjet printer of embodiment of this invention. It is explanatory drawing which shows the manufacturing process of the inkjet head of the inkjet printer of embodiment of this invention. It is a modification of the inkjet head of the inkjet printer of embodiment of this invention. It is a modification of the inkjet head of the inkjet printer of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inkjet printer 9 Inkjet head 19 Nozzle plate 19a Ink ejection hole 20 Base plate 21 Nozzle cap (base plate)
21a Protruding portion 21b Planar portion 21c Tip end of projecting portion 21d Tip end surface of planar portion 28 Carriage C1 First virtual line C2 Second virtual line C3 Third virtual line L1 Transport direction (one direction)
L2 Scanning direction S1, S2 Opposite surface

Claims (5)

A nozzle plate having a plurality of ink ejection holes arranged in one direction;
A base plate that supports the nozzle plate such that the plurality of ink ejection holes face a recording medium;
An inkjet head mounted in a row in the scanning direction on a carriage supported so as to be drivable in a scanning direction orthogonal to the one direction;
In each opposing surface of the base plates adjacent to each other in the scanning direction, a pair is provided at both ends of the one opposing surface in the one direction when the base plate is viewed from the side where the ink ejection holes are opened. And a pair of flat portions are provided at both end portions in the one direction of the other facing surface so that the protruding portions and the flat portions face each other in the scanning direction. An inkjet head. The inkjet head according to claim 1,
The inkjet head according to claim 1, wherein the protruding portion and the flat portion are provided on the ink ejection hole side of the base plate. The inkjet head according to claim 1 or 2,
The ink jet head according to claim 1, wherein the flat portion is a flat surface recessed from the facing surface.   An ink jet recording apparatus comprising the ink jet head according to claim 1. An inkjet head manufacturing method for manufacturing the inkjet head according to any one of claims 1 to 3,
Forming a plurality of the inkjet heads by fixing the nozzle plate to the base plate;
For each of the inkjet heads, a virtual line specifying step of specifying a first virtual line passing through each ink jet hole located at both ends of the one direction among the plurality of ink jet holes;
A third imaginary line that passes through the tip surfaces of the pair of flat surfaces while removing the projection so that a second imaginary line that passes through the tips of the pair of projections is parallel to the first imaginary line. A processing step of removing the planar portion so that is parallel to the first imaginary line,
A method of manufacturing an ink jet head, comprising:

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