JP3744129B2 - Inkjet head manufacturing method, inkjet head, and inkjet printer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention belongs to the technical field of a so-called full-line type inkjet head, which is an inkjet head in an inkjet printer and includes a plurality of unit heads each having a plurality of ink discharge ports (nozzles) formed in a row. .
[0002]
[Prior art]
  In the conventional full-line type inkjet head, a recording head having a width larger than the entire width in the direction perpendicular to the conveyance direction of the recording medium such as recording paper (a plurality of ink discharge ports are arranged in a line in the width direction) Is inclined in a plane parallel to the conveyance direction with respect to the conveyance direction of the recording medium, so that one dot is formed on the recording medium by the ink ejected from the ink ejection port. The desired resolution was obtained by setting the interval of (1) to a predetermined interval.
[0003]
  In addition to this, a plurality of recording heads (hereinafter referred to as unit heads) which are smaller than the entire width of the recording medium and have the ink discharge ports arranged in a line in the width direction are arranged in the width direction. A recording head configured so that the ink discharge ports are arranged over the entire width of the recording medium by arranging them is also common.
[0004]
[Problems to be solved by the invention]
  However, when a recording head larger than the full width of the recording medium is used, the recording head itself is long and large, so that it is difficult to manufacture accurately and the manufacturing yield is significantly reduced. There is a problem.
[0005]
  Further, when a recording head is formed over the entire width of the recording medium using a plurality of unit heads, in order to improve the resolution by narrowing the dot interval in the recording medium rather than the nozzle pitch in the unit head, each unit In general, the head is arranged to be inclined with respect to the recording medium conveyance direction to narrow the dot interval. However, in this method, the adjacent unit heads are strictly positioned in correspondence with the desired dot interval (more specifically, the interval between the outermost ink discharge ports in the adjacent unit heads is accurately determined. In this case, the unit head itself is very small (for example, when realizing a resolution of 300 dpi (dot per inch), the interval between the ink ejection ports is set to about 75 μm). For this reason, there is a problem that it is difficult to arrange each unit head with high accuracy (more specifically, for example, accuracy of about ± 1 μm is necessary).
[0006]
  In addition, there is a problem that the resolution is partially different due to an error in the tilt angle of each unit head, or the ink discharge ports cannot be arranged over the entire width of the recording paper.
[0007]
  Therefore, the present invention has been made in view of the above-described problems, and the problem is that an inkjet head manufacturing method capable of easily manufacturing a full-line type inkjet head having a predetermined resolution with a high yield, and An ink jet head and an ink jet printer provided with the ink jet head are provided.
[0008]
[Means for Solving the Problems]
  In order to solve the above-described problems, the invention described in claim 1 is characterized in that ink discharge ports for discharging ink for forming a dot on a recording medium such as recording paper are arranged in a line at equal intervals. An inkjet head manufacturing method for manufacturing an inkjet head formed by including a plurality of unit heads each having a discharge port array formed on the outermost surface of one of the discharge port arrays in one unit head. A straight line connecting the ink discharge port located and the ink discharge port located on the outermost side in the opposite direction to the one of the discharge port rows in the other unit head adjacent to the one unit head. The plurality of unit heads such that a certain connection straight line is perpendicular to a straight line including the discharge port array and the straight lines including the discharge port array in each of the unit heads are parallel to each other. Connect while shifting in one direction,When the interval between the ink discharge ports in one unit head is P and the distance between the two ink discharge ports included in the connection straight line is L, the plurality of dots are arranged in a line. A plurality of unit heads are connected so that an angle θ formed by a straight line including a dot row and a straight line including the discharge port row is tan θ = P / L.A forming step of forming the inkjet head;SaidWhen the interval between the dots on the recording medium is D, an angle θ formed by a straight line including a dot row in which a plurality of the dots are arranged in a row and a straight line including the ejection port row is cos θ = A fixing step of installing and fixing the formed inkjet head so as to be D / P.
[0009]
  According to the operation of the first aspect of the invention, in the forming step, the connecting straight line is perpendicular to the straight line including the discharge port array, and the straight lines including the discharge port array in each unit head are parallel to each other. Connect multiple unit heads while shifting them in one direction.The plurality of dots are arranged in a line when the interval between the ink discharge ports in one unit head is P and the distance between the two ink discharge ports included in the connection straight line is L. The plurality of unit heads are connected so that an angle θ formed by a straight line including the dot row and the straight line including the discharge port row is tan θ = P / L.An ink jet head is formed.
[0010]
  Then, in the fixing step, the inkjet head is installed and fixed so that the angle θ formed by the straight line including the dot row on the recording medium and the straight line including the ejection port row is cos θ = D / P.
[0011]
  Therefore, since the inkjet head can be formed by simply connecting a plurality of unit heads so that the connecting straight line is perpendicular to the straight line including the ejection port array, the positioning process at the time of connecting the unit head is simplified and the inkjet head is manufactured. The overall process can be simplified, and the yield in manufacturing the inkjet head is improved.
[0012]
  Further, by changing the angle θ, an arbitrary dot pitch can be easily realized on the recording medium.
[0013]
  Further, in the forming process, when the distance between the two ink discharge ports included in the connection straight line is L, a plurality of unit heads are connected so that tan θ = P / L, and the inkjet head Form.
  Therefore, even when a plurality of unit heads are connected to form an ink jet head, the interval between all dots in the dot row on the recording medium can be made constant.
[0014]
In order to solve the above-described problem, the invention according to claim 2 is the method of manufacturing an ink-jet head according to claim 1, wherein, in the forming step, each unit head has a thickness of the distance L. The plurality of ink ejection openings are arranged on a center line passing through the center in the thickness direction.
According to the operation of the invention described in claim 2, in addition to the operation of the invention described in claim 1, in the forming step, the thickness of each unit head is the distance L, and a plurality of ink discharge ports They are arranged on a center line passing through the center in the thickness direction.
Therefore, since the inkjet head can be formed by simply connecting a plurality of unit heads so that the connecting straight line is perpendicular to the straight line including the ejection port array, the positioning process at the time of connecting the unit head is simplified and the inkjet head is manufactured. The overall process can be simplified, and the yield in manufacturing the inkjet head is improved.
[0015]
In order to solve the above-mentioned problem, the invention according to claim 3 is the method of manufacturing an ink-jet head according to claim 1, wherein in the fixing step, the ink-jet head is arranged in a straight line perpendicular to the conveyance direction of the recording medium. Is fixed so that the plane including all the ink discharge ports is parallel to the recording surface of the recording medium.
According to the operation of the invention described in claim 3, in addition to the operation of the invention described in claim 1, in the fixing step, the inkjet head is formed at an angle θ with respect to a straight line perpendicular to the conveyance direction of the recording medium. At the same time, the plane including all the ink discharge ports is fixed so as to be parallel to the recording surface of the recording medium.
Therefore, even when a plurality of unit heads are connected to form an ink jet head, all the dot intervals in the dot row on the recording medium can be made constant.
[0016]
  To solve the above problems, the claims4The invention described in 1 includes a unit head having an ejection port array in which ink ejection ports for ejecting ink for performing recording by forming dots on a recording medium such as recording paper are formed in a line at equal intervals. A plurality of inkjet heads, the ink ejection ports located on the outermost side of one of the ejection port arrays in one unit head, and the other unit heads adjacent to the one unit head A connection straight line that connects the ink discharge ports located on the outermost side in the direction opposite to the one of the discharge port arrays is perpendicular to a straight line including the discharge port arrays, and the unit head in each of the unit heads. A plurality of the unit heads are connected so as to be displaced in one direction so that straight lines including the discharge port arrays are parallel to each other,When the interval between the ink discharge ports in one unit head is P and the distance between the two ink discharge ports included in the connection straight line is L, the plurality of dots are arranged in a line. The angle θ formed by the straight line including the dot row and the straight line including the discharge port row is tan θ = P / L,Furthermore,SaidWhen the interval between the dots on the recording medium is D, an angle θ formed by a straight line including a dot row in which a plurality of the dots are arranged in a row and a straight line including the ejection port row is cos θ = D / P.
[0017]
  Claim4According to the operation of the invention described in (4), a plurality of unit heads are connected so that the connecting straight line is perpendicular to the straight line including the discharge port array and the straight lines including the discharge port array in each unit head are parallel to each other. Further, the angle θ formed by the straight line including the dot row on the recording medium and the straight line including the discharge port row is cos θ = D / P.
[0018]
  Therefore, since the inkjet head can be formed by simply connecting a plurality of unit heads so that the connecting straight line is perpendicular to the straight line including the ejection port array, the positioning process at the time of connecting the unit head is simplified and the inkjet head is manufactured. The overall process can be simplified, and the yield in manufacturing the inkjet head is improved.
[0019]
  Further, an arbitrary dot pitch can be easily realized on the recording medium by changing the angle θ.
[0020]
Further, when the distance between the two ink ejection ports included in the connection straight line is L, the plurality of unit heads are connected so that tan θ = P / L.
Therefore, when the distance between the two ink discharge ports included in the connection straight line is L, a plurality of unit heads are connected so that tan θ = P / L. Even when the head is formed, all the dot intervals in the dot row on the recording medium can be made constant.
[0021]
  In order to solve the above-described problem, according to a fifth aspect of the present invention, in the inkjet head according to the fourth aspect, each unit head has the thickness L and the plurality of ink discharge heads. The outlets were formed so as to be arranged on a center line passing through the center in the thickness direction.
According to the operation of the invention described in claim 5, in addition to the operation of the invention described in claim 4, the thickness of each unit head is the distance L, and the plurality of ink discharge ports have the thickness. They were arranged on a center line passing through the center in the vertical direction.
Therefore, since the inkjet head can be formed by simply connecting a plurality of unit heads so that the connecting straight line is perpendicular to the straight line including the ejection port array, the positioning process at the time of connecting the unit head is simplified and the inkjet head is manufactured. The overall process can be simplified, and the yield in manufacturing the inkjet head is improved.
In order to solve the above-described problem, the invention according to claim 6 is the ink-jet head according to claim 4, wherein the angle θ with respect to a straight line perpendicular to the conveyance direction of the recording medium is set to the ink-jet head. At the same time, the flat surface including all the ink discharge ports was fixed so as to be parallel to the recording surface of the recording medium.
According to the operation of the invention described in claim 6, in addition to the operation of the invention described in claim 4, the ink jet head is formed at an angle θ with respect to a straight line perpendicular to the conveyance direction of the recording medium and The flat surface including the ink discharge ports was fixed so as to be parallel to the recording surface of the recording medium.
Therefore, even when a plurality of unit heads are connected to form an ink jet head, all the dot intervals in the dot row on the recording medium can be made constant.
[0022]
  To solve the above problems, the claims7The invention described in claimAny one of 4 to 6A head drive unit that drives the ink-jet head based on recording information to be recorded and performs recording on the recording medium, and a supply unit such as a pump that supplies the ink to the ink-jet head. And other driving means.
[0023]
  Claim7According to the operation of the invention described in claimAny one of 4 to 6In addition to the operation of the invention described in (1), the supply means supplies ink to the inkjet head.
[0024]
  The driving unit drives the ink jet head based on the recording information and performs recording on the recording medium.
[0025]
  Therefore, an inkjet printer can be obtained by simply manufacturing an inkjet head.
[0026]
  Further, it is possible to record at an arbitrary resolution by changing the angle θ in the ink jet head.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
  Next, preferred embodiments of the present invention will be described with reference to the drawings. The embodiment described below is an embodiment when the present invention is applied to a printer having a so-called full-line type ink jet head in which ink discharge ports are arranged over the entire width of a recording sheet. .
[0028]
(I) Overall configuration and outline operation of the printer
  First, the overall configuration of the printer according to the embodiment will be described with reference to FIG.
[0029]
  As shown in FIG. 1, the printer S according to the embodiment includes an inkjet head 1, a CPU 2, a data development unit 3, a head drive unit 4 as a drive unit, an ink tank 5, and a supply unit according to the present invention. As a pump 6, a hose 7, an operation unit 8, and a display unit 9.
[0030]
  Next, the outline operation of each part will be described.
[0031]
  The data expansion unit 3 expands the recording information Sr to be recorded input from the outside into so-called bitmap data for one sheet of recording paper, and generates a data signal Sdr.
[0032]
  Then, the head drive unit 4 outputs a drive signal Sd for driving the inkjet head 1 having the configuration described below based on the data signal Sdr and causes the inkjet head 1 to eject ink under the control of the CPU 2. With this control, an image corresponding to the recording information Sr is formed on the recording paper conveyed in synchronism with ink ejection.
[0033]
  In parallel with this, the pump 6 supplies the ink stored in the ink tank 5 to the inkjet head 1 under the control of the CPU 2.
[0034]
  On the other hand, the CPU 2 controls the entire operation of the printer S including the above-described operation.
[0035]
  At this time, the operation unit 8 generates an input signal based on a user's operation and outputs it to the CPU 2, and the display unit 9 displays necessary items such as the operating state of the printer S under the control of the CPU 2.
[0036]
(II) Configuration of inkjet head
  Next, the configuration of the inkjet head 1 according to the present invention will be described with reference to FIG. FIG. 2 is a front view of the surface including the ink discharge port of the inkjet head 1 as viewed from the ink discharge direction.
[0037]
  As shown in FIG. 2A, the inkjet head 1 is configured by connecting four unit heads 10a to 10d having a width smaller than the entire width of the recording paper 12 so as to be displaced in one direction. (A) The ink discharge port 11 is arranged in the direction of the recording paper 12 below the conveyance path of the recording paper 12 conveyed in the direction indicated by the middle arrow (the other side of the recording paper 12 in FIG. 2A). Has been.
[0038]
  Each of the unit heads 10a to 10d includes a plurality of ink discharge ports 11 arranged in a line, and the interval between the ink discharge ports 11 is P. Further, an angle formed between a straight line including each ink discharge port 11 in each unit head 10a to 10d and a straight line perpendicular to the conveyance direction of the recording paper 12 is θ, and each ink discharge port in each unit head 10a to 10d. 11 are parallel to each other, and are arranged so that an image can be formed over the entire width of the recording paper 12 by the ink discharge ports 11 in all the unit heads 10a to 10d. In addition, the inkjet head 1 is arranged so that the surface including all the ink discharge ports 11 and the recording surface of the recording paper 12 are parallel to each other.
[0039]
  With this configuration, the interval D between the dots 13 formed on the recording paper 12 is as follows for each of the unit heads 10a to 10d.
  D = P × cos θ (<P)
  Therefore, it is possible to form dots 13 on the recording paper 12 by forming the dots 13 at an interval narrower than the interval P of the ink discharge ports 11 in each of the unit heads 10a to 10d (that is, at a high resolution).
[0040]
  Next, a configuration of a connection portion between one unit head 10a to 10c and another unit head 10b to 10d adjacent to the unit head 10a to 10c will be described using the case of the unit head 10a and the unit head 10b as an example with reference to FIG. .
[0041]
  As shown in FIG. 2B, at the connecting portion between the unit head 10a and the unit head 10b, a straight line connecting the ink discharge port 11a at one end of the unit head 10a and the ink discharge port 11b at the other end of the unit head 10b. The unit heads 10a or 10b are connected so as to be perpendicular to a straight line including the ink discharge ports 11. The distance L between the straight line including the ink discharge port 11 in the unit head 10a and the straight line including the ink discharge port 11 in the unit head 10b is
  tan θ = P / L
  (In other words, the thickness of each of the unit heads 10a to 10d is L, and the ink discharge port 11 is formed on the center line of the unit heads 10a to 10d). .
[0042]
  This is because the distance between the dot 13a formed by the ink from the ink discharge port 11a and the dot 13b formed by the ink from the ink discharge port 11b at the connecting portion of the unit head 10a and the unit head 10b is also the above D (= P × cos θ), but at this time,
  L × sin θ = D = P × cos θ
  So, from this,
  P / L = sin θ / cos θ = tan θ
  Then, the interval between the dots 13a and 13b is D which is the same as the interval between the other dots.
[0043]
(III) Manufacturing process of inkjet head
  Next, the manufacturing process of the inkjet head 1 according to the present invention will be described with reference to FIGS.
[0044]
  In manufacturing the ink-jet head 1, as shown in FIG. 3, the unit heads 10a to 10d are first positioned (step S1). In this positioning, the connecting portions of the unit heads 10a to 10d are visually observed while being enlarged using a camera and a monitor so that the connecting portions of the unit heads 10a to 10d have the shape shown in FIG. 2B. The At this time, for example, in the relationship between the unit head 10a and the unit head 10b, the ink discharge port 11a and the ink discharge port 11b are on a straight line as shown in FIG. 4A, and the straight line corresponds to each unit head 10a. 10d to 10d, the unit heads 10a to 10d are thin (thickness L) if they are positioned so as to be perpendicular to the straight line including the ink discharge port 11, and at least the diameter of the ink discharge port 11 or less. The unit heads can be positioned with high accuracy.
[0045]
  When the positioning of the unit heads 10a to 10d is completed in step S1, each unit head 10a to 10d is connected at the determined position (step S2). Thereby, the inkjet head 1 itself is completed.
[0046]
  Next, in order to obtain the desired interval D of the dots 13, the completed inkjet head 1 is formed with the angle θ with respect to a straight line perpendicular to the conveyance direction of the recording paper 12 and a plane including all the ink ejection ports 11. The inkjet head 1 is fixed to a support portion (not shown) so as to be parallel to the recording surface of the recording paper 12 (see FIG. 4B). After that, the connection of the hose 7 or the head driving portion 4 or the like Connection is performed (step S4), and the manufacture of the inkjet head 1 is completed.
[0047]
  As described above, according to the inkjet head 1 and the method for manufacturing the same of the present invention, for example, the straight line connecting the ink discharge port 11a and the ink discharge port 11b is perpendicular to the straight line including each ink discharge port 11. The plurality of unit heads 10a to 10d are connected while being shifted in one direction so that the straight lines including the ink discharge ports 11 in the respective unit heads 10a to 10d are parallel to each other, and then the inkjet head 1 is formed. Since the ink jet head is installed and fixed so that the angle θ formed by the straight line including the dots 13 on the recording paper 12 and the straight line including the ink discharge port 11 is cos θ = D / P, the ink discharge port 11a and the ink discharge port are fixed. The inkjet head 1 can be formed simply by connecting the straight line connecting the outlet 11b so as to be perpendicular to the straight line including the ink discharge port 11. In addition, the positioning process when connecting the unit heads can be simplified to simplify the entire manufacturing process of the inkjet head 1, and the yield in manufacturing the inkjet head can be improved.
[0048]
  Further, an arbitrary dot pitch can be easily realized on the recording paper 12 by changing the angle θ.
[0049]
  In the above-described embodiment, the ink discharge ports 11 in adjacent unit heads are overlapped one by one to perform positioning of each unit head. However, in addition to this, a plurality of ink discharge ports 11 may be overlapped. Thus, an ink jet head may be configured. In this case, by disposing the positions of the ink discharge ports 11 of one unit head in a staggered manner between the ink discharge ports 11 of adjacent unit heads, it is possible to form a higher resolution image.
[0050]
  The present invention can also be applied to a printer capable of color recording. In this case, the ink jet head 1 and the ink tank 5 are provided for each color used for recording (for example, each color of cyan, magenta, yellow, and black).
[0051]
  Furthermore, in the above embodiment, the inkjet head 1 in which the ink discharge ports 11 are arranged over the entire width of the recording paper 12 has been described. However, in addition to this, the inkjet head 1 has a plurality of unit heads, and the width of the recording paper at the time of recording. The present invention can also be applied to an inkjet head that performs recording while moving in the direction.
[0052]
【The invention's effect】
  As described above, according to the first aspect of the present invention, the connecting straight line is perpendicular to the straight line including the discharge port array, and the straight lines including the discharge port array in each unit head are parallel to each other. A plurality of unit heads are connected to each other while being shifted in one direction to form an ink jet head. Next, an angle θ formed by a straight line including a dot row on a recording medium and a straight line including an ejection port row is cos θ = D / Install and fix the inkjet head so that it becomes P.
[0053]
  Therefore, since the inkjet head can be formed by simply connecting a plurality of unit heads so that the connecting straight line is perpendicular to the straight line including the ejection port array, the positioning process at the time of connecting the unit head is simplified and the inkjet head is manufactured. The overall process can be simplified, and the yield in manufacturing the inkjet head is improved.
[0054]
  Further, by changing the angle θ, an arbitrary dot pitch can be easily realized on the recording medium.
[0055]
  Therefore, an inkjet head having a predetermined resolution can be easily manufactured.
Further, in the forming step, when the distance between the two ink discharge ports included in the connection straight line is L, a plurality of unit heads are connected so as to satisfy tan θ = P / L. Even when the unit heads are connected to form an ink jet head, all the dot intervals in the dot row on the recording medium can be made constant.
[0056]
According to the operation of the invention described in claim 2, in addition to the effect of the invention described in claim 1, in the forming step, the thickness of each unit head is the distance L, and the plurality of ink discharge ports are By forming an array on the center line passing through the center in the thickness direction, an inkjet head can be formed simply by connecting a plurality of unit heads so that the connecting straight line is perpendicular to the straight line including the ejection port array. The positioning process at the time of head connection can be simplified to simplify the entire manufacturing process of the inkjet head, and the yield in manufacturing the inkjet head can be improved.
According to the operation of the invention described in claim 3, in addition to the effect of the invention described in claim 1, in the fixing step, the inkjet head is formed at an angle θ with respect to a straight line perpendicular to the conveyance direction of the recording medium. At the same time, even when an inkjet head is formed by connecting a plurality of unit heads by fixing the plane including all the ink discharge ports so as to be parallel to the recording surface of the recording medium, All dot intervals can be made constant.
[0057]
  Claim4According to the invention described above, the plurality of unit heads are arranged in one direction so that the connecting straight line is perpendicular to the straight line including the discharge port array and the straight lines including the discharge port array in each unit head are parallel to each other. Further, the angle θ formed by the straight line including the dot row on the recording medium and the straight line including the ejection port row is cos θ = D / P.
[0058]
  Therefore, since the inkjet head can be formed by simply connecting a plurality of unit heads so that the connecting straight line is perpendicular to the straight line including the ejection port array, the positioning process at the time of connecting the unit head is simplified and the inkjet head is manufactured. The overall process can be simplified, and the yield in manufacturing the inkjet head is improved.
[0059]
  Further, an arbitrary dot pitch can be easily realized on the recording medium by changing the angle θ.
Further, when the distance between the two ink discharge ports included in the connection straight line is L, a plurality of unit heads are connected so that tan θ = P / L. Even when the head is formed, all the dot intervals in the dot row on the recording medium can be made constant.
[0060]
  According to the operation of the invention described in claim 5, in addition to the effect of the invention described in claim 4, the thickness of each unit head is the distance L, and the plurality of ink discharge ports have the thickness. Since the plurality of unit heads are arranged on the center line passing through the center in the vertical direction, an inkjet head can be formed simply by connecting a plurality of unit heads so that the connecting straight line is perpendicular to the straight line including the discharge port array. The positioning process at the time of connection can be simplified to simplify the entire manufacturing process of the inkjet head, and the yield in manufacturing the inkjet head can be improved.
According to the operation of the invention described in claim 6, in addition to the effect of the invention described in claim 4, the inkjet head is formed at an angle θ with respect to a straight line perpendicular to the conveyance direction of the recording medium. By fixing the plane including the ink discharge port so as to be parallel to the recording surface of the recording medium, even when an inkjet head is formed by connecting a plurality of unit heads, All dot intervals in the dot row can be made constant.
[0061]
  Claim7According to the invention described in claimAny one of 4 to 6In addition to the effects of the invention described in (1), ink is supplied to the ink jet head, the ink jet head is driven based on the recording information, and recording is performed on the recording medium. Can be acquired.
[0062]
  Further, it is possible to record at an arbitrary resolution by changing the angle θ in the ink jet head.
[Brief description of the drawings]
FIG. 1 is a block diagram illustrating a schematic configuration of a printer according to an embodiment.
2A and 2B are diagrams illustrating a configuration of an inkjet head according to an embodiment, in which FIG. 2A is a diagram illustrating an overall configuration, and FIG. 2B is an enlarged view illustrating a connection portion;
FIG. 3 is a flowchart showing manufacturing steps of the ink jet head.
4A and 4B are diagrams for explaining a manufacturing process of an inkjet head, FIG. 4A is a diagram for explaining positioning of a unit head, and FIG. 4B is a diagram for explaining fixing of the inkjet head.
[Explanation of symbols]
  1 ... Inkjet head
  2 ... CPU
  3 ... Data development department
  4. Head drive unit
  5 ... Ink tank
  6 ... Pump
  7 ... Hose
  8 ... Operation part
  9 ... Display section
  10a, 10b, 10c, 10d ... unit head
  11, 11a, 11b ... Ink ejection port
  12. Recording paper
  13 ... dot
  S ... Printer
  Sr ... Recording information
  Sdr: Data signal
  Sd: Drive signal

Claims (7)

An inkjet head formed by including a plurality of unit heads each having an ejection port array in which ink ejection ports for ejecting ink for recording by forming dots on a recording medium are arranged in a line at equal intervals An inkjet head manufacturing method for manufacturing,
The ink ejection port located on the outermost side of one of the ejection port arrays in one unit head is opposite to the one of the ejection port arrays in the other unit head adjacent to the one unit head. The connecting straight line connecting the ink discharge ports located at the outermost part of the direction is perpendicular to the straight line including the discharge port arrays, and the straight lines including the discharge port arrays in the unit heads are mutually connected. The plurality of unit heads are connected while being shifted in one direction so as to be parallel, and the interval between the ink discharge ports in one unit head is P, and between the two ink discharge ports included in the connection straight line When the distance is L, an angle θ formed by a straight line including a dot row in which a plurality of the dots are arranged in a row and a straight line including the ejection port row,
tan θ = P / L
Forming the inkjet head by connecting a plurality of unit heads such that
When the interval between the dots on the recording medium is D, an angle θ formed by a straight line including a dot row in which a plurality of the dots are arranged in a row and a straight line including the ejection port row is,
cos θ = D / P
A fixing step of installing and fixing the formed inkjet head to be
An ink jet head manufacturing method comprising: The inkjet head manufacturing method according to claim 1,
In the forming step, each unit head has a thickness L, and the plurality of ink discharge ports are formed by being arranged on a center line passing through the center in the thickness direction. Manufacturing method of the head. The inkjet head manufacturing method according to claim 1,
In the fixing step, the inkjet head is formed at the angle θ with respect to a straight line perpendicular to the conveyance direction of the recording medium, and a plane including all the ink discharge ports is parallel to the recording surface of the recording medium. A method for manufacturing an ink jet head, wherein the fixing is performed as described above . An ink jet head including a plurality of unit heads each having an ejection port array in which ink ejection ports for ejecting ink for forming dots on a recording medium are arranged in a line at equal intervals,
The ink ejection port located on the outermost side of one of the ejection port arrays in one unit head is opposite to the one of the ejection port arrays in the other unit head adjacent to the one unit head. The connecting straight line connecting the ink discharge ports located at the outermost part of the direction is perpendicular to the straight line including the discharge port arrays, and the straight lines including the discharge port arrays in the unit heads are mutually connected. The plurality of unit heads are connected to be shifted in one direction so as to be parallel, and the interval between the ink discharge ports in one unit head is P, and between the two ink discharge ports included in the connection straight line When the distance is L, an angle θ formed by a straight line including a dot row in which a plurality of the dots are arranged in a row and a straight line including the ejection port row,
tan θ = P / L
And
Furthermore, the spacing of the dots on the recording medium when is D, the angle between the straight line in which a plurality of said dots including linear and the outlet row including the dot row formed in a row θ ,
cos θ = D / P
An ink jet head characterized by that. The inkjet head according to claim 4 ,
Each of the unit heads has a thickness of the distance L, and the plurality of ink discharge ports are formed on a center line passing through the center in the thickness direction . The inkjet head according to claim 4,
The inkjet head is fixed so that the angle θ is formed with respect to a straight line perpendicular to the conveyance direction of the recording medium, and a plane including all the ink ejection ports is parallel to the recording surface of the recording medium. an inkjet head according to claim. The inkjet head according to any one of claims 4 to 6 ,
Supply means for supplying the ink to the inkjet head;
Driving means for driving the inkjet head based on recording information to be recorded and recording on the recording medium;
An ink jet printer comprising:

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