JP5171127B2 - Inkjet recording head and inkjet recording apparatus - Google Patents

Description

  The present invention relates to a discharge port arrangement configuration on an orifice plate of an ink jet recording head having a plurality of discharge ports for discharging ink for a plurality of colors.

  In recent years, serial color ink jet recording apparatuses that are relatively small and easy to use have been widely used as image output apparatuses. In a serial type ink jet recording apparatus, a recording main scan that scans a recording medium while ejecting ink from a recording head and a sub-scan that transports a predetermined amount of the recording medium in a direction intersecting the recording main scan are intermittent. The image is formed step by step by repeating the above. In this case, when it is desired to output an image at high speed, so-called bi-directional printing is adopted in which ink is ejected in both forward scanning and backward scanning of the recording head.

  However, when bi-directional printing is performed using a plurality of colors of ink, the order of ink application to the recording medium is reversed depending on the scanning direction of the recording head, which raises an image problem of color unevenness. For example, even when a green image is recorded by a mixed color of cyan and yellow, green formed by adding cyan to the recording medium first and then yellow, and cyan after applying yellow first. The green color is not the same when applied and formed. Therefore, since two types of greens with different colors recorded in the forward scan and the backward scan are alternately arranged in the sub-scanning direction, this causes adverse color unevenness and deteriorates the image.

  Patent Document 1 discloses a configuration of a symmetric recording head for solving such a problem of color unevenness. The target type recording head has a plurality of ink ejection port arrays for each color, and the ejection order of the inks to the recording medium is the same for both forward scanning and backward scanning. The outlet rows are arranged symmetrically.

  FIG. 9 is a schematic diagram for explaining an example of the arrangement of ejection openings in the symmetric recording head. In the figure, the orifice plate 1004 has six rows of ejection port arrays, each of which is formed by arranging ejection ports for ejecting the same type of ink at a pitch T in the sub-scanning direction. Here, C1 and C2 are ejection port arrays that eject cyan ink, M1 and M2 are ejection port arrays that eject magenta ink, and Y1 and Y2 are ejection port arrays that eject yellow ink, respectively. As described above, since the ejection port arrays for each of the two colors are arranged symmetrically, the order of ink application to the recording medium in both forward scanning and backward scanning is cyan → magenta → yellow → yellow → magenta → They are unified in the order of cyan. Therefore, even if bi-directional recording is performed for high-speed output, color unevenness does not occur.

  In the recording head shown in FIG. 9, two ejection port arrays (for example, C1 and C2) of the same color are arranged so as to be shifted from each other by T / 2 pitch in the sub-scanning direction. With such a configuration, in one recording scan of the recording head, a high-resolution recording image in which dots are arranged at a pitch of T / 2 in the sub-scanning direction can be obtained. That is, when the individual ejection port arrays are arranged at a pitch of 600 dpi (dot / inch; reference value), an image having a resolution of 1200 dpi can be recorded on the recording medium.

  In Patent Document 1, while using a recording head as shown in FIG. 9, recording is performed by only C1, M1, and Y1 in the forward scanning, and in one pass bidirectional by only C2, M2, and Y2 in the backward scanning. A method of recording is also disclosed. By adopting such a recording method, it is possible to output an image having no adverse effects on color unevenness at a high speed although it has a low resolution.

  FIG. 10 is a schematic diagram for explaining another configuration example of the symmetric recording head. Here, four ejection port arrays are prepared for cyan ink and magenta ink, respectively. That is, C1, Cs1, C2, and Cs2 eject cyan ink, M1, Ms1, M2, and Ms2 eject magenta ink, and Y1 and Y2 eject yellow ink, respectively. Cs1, Cs2, Ms1, and Ms2 are ejection port arrays that eject less ink than C1, C2, M1, M2, Y1, and Y2. In recent years, in order to reduce the graininess of the highlight part of the image and improve the gradation, a number of ink jet recording heads have been provided that realize two or more levels of ejection for each ink color. Has been.

JP 2001-171119 A

  However, as shown in FIG. 9 and FIG. 10, the symmetrical recording head in which many ejection port arrays are arranged has many mists and satellites at the time of recording operation, and there is a new problem due to these adhering to the orifice plate. Has been invited.

  In a high-density discharge operation of a large number of discharge port arrays, an air flow is generated from the orifice plate 1004 toward the recording medium, and this affects the traveling direction of the ink being discharged and the floating mist. According to the study by the present inventors, such an air flow tends to flow from the outside to the inside in the main scanning direction of the recording head, and tends to collect a lot of ink mist at the center between the ejection port arrays to be used. It was confirmed. When recording an arbitrary ink color independently, the two nozzle rows that discharge the same color and the same discharge amount of ink have substantially the same discharge frequency, and the most ink is at the center of the two discharge port rows. Is attached. Therefore, as shown in FIG. 10, in a configuration in which nozzle rows of the same color and the same discharge amount are symmetrically arranged on the left and right, all color inks are located near the center of the orifice plate, that is, near the center line indicated by XX ′. Adhere most.

  FIG. 11 is a diagram for explaining the state of ink mist adhering to the orifice plate after recording a uniform image at a predetermined frequency using all the ejection port arrays. As shown in the figure, the most ink is adhered near the center of the orifice plate, that is, between the nozzle row Y1 and the nozzle row Y2. In such a state, the adhering ink may enter the Y1 or Y2 ejection port, and if an image is recorded in this state, the yellow image will be mixed with other color inks, degrading the image. .

  The present invention has been made in view of the above problems. Therefore, the target is an ejection port capable of avoiding color mixing caused by ink adhering to the orifice plate as much as possible even in a configuration having many ejection port arrays such as a symmetric recording head. An inkjet recording head having an array configuration is provided.

Therefore, in the present invention, an integral orifice plate configured by arranging a plurality of ejection port arrays in which ejection ports for ejecting ink are arranged in parallel in a direction intersecting the direction of the arrangement, and the ejection port And an integrated substrate including a plurality of elements that generate energy used to eject ink,
The plurality of ejection port arrays include at least a first ejection port array and a second ejection port array that eject ink of the same color and the same ejection amount,
Said first outlet row and the second ejection port center line in the middle extending in the direction of the array of columns are spaced with any 0.2mm or more distances of the plurality of outlet rows, wherein The plurality of ejection port arrays are arranged in parallel so that the order in which the ink colors are arranged is the same in both the forward direction and the backward direction in the direction intersecting the arrangement direction,
The plurality of ejection port arrays include first and second ejection port arrays that eject ink of the first color from one end side to the other end side of the orifice plate in a direction intersecting the arrangement direction. A third group of ejection port groups, a second group of ejection ports comprising two rows of ejection port rows in parallel to eject ink of the second color, and a third group of ejection port rows in parallel to eject ink of the first color. It is arranged in the order of the discharge port group,
The distance between the center line of the two ejection port arrays in the first ejection port group and the center line of the two ejection port arrays in the second ejection port group, and 2 in the second ejection port group. The distance between the center line of the discharge port array and the center line of the two discharge port arrays in the third discharge port group is different .

  According to the present invention, the ejection port arrays of the respective colors are separated from any of the regions where ink is most likely to adhere by the two ejection port arrays of the same color and the same ejection amount, and the color mixing phenomenon can be avoided.

  FIG. 1 is a perspective view for explaining the internal configuration of a serial type color ink jet recording apparatus 200 applicable to the present invention. The carriage 201 moves reciprocally with respect to the main scanning direction in the figure as the screw shaft 204 rotates in a state where the recording head 100 that discharges ink and the ink tank 202 that supplies ink of three colors to the recording head 100 are mounted. Scan. During this moving scan, an image for one line is recorded on the recording medium P by performing ejection based on the recording signal from the recording head 100. When such one recording scan is completed, the recording medium P is conveyed by a predetermined amount in the sub-scanning direction by the rotation of the conveying roller 205. An image is formed in stages on the recording medium P by alternately repeating the recording scanning and the conveying operation as described above.

  The recording head 100 is detachably mounted on the carriage 201. Also, referring to FIG. 2, three ink tanks 202Y, 202M and 202C containing ink of each color are also independently attached to and detached from the recording head 100. It is possible.

  FIG. 3 is a diagram for explaining the configuration of the recording head 100 in more detail. The recording head 100 receives a recording signal from the recording element substrate 110 having a configuration for ejecting ink and the recording apparatus main body, and causes each recording element of the recording element substrate 110 to perform ejection. A connector 120 for transmission is provided.

  4A and 4B are a plan view and a cross-sectional view for explaining the structure of the recording element substrate 110. FIG. The recording element substrate 110 is configured by laminating an orifice plate 104 for guiding various wirings and inks on a silicon substrate 105. Here, FIG. 4A is a plan view for mainly explaining the wiring structure of the recording element substrate 110. On the silicon substrate 105, a plurality of heaters 107 for generating energy used for ejecting ink are arranged at a pitch corresponding to the recording resolution. In the figure, 107-L is a large heater for ejecting a relatively large amount of ink, and 107-S is a small heater for ejecting a relatively small amount of ink. A drive circuit 108 is disposed on the side of each heater row, and drives each heater 107 based on recording signals received from a large number of connection elements 109. An ink supply path 111 for supplying ink in common to the positions of the individual heaters is formed between the large heater row and the small heater row.

  FIG. 4B is a cross-sectional view for explaining a state in which the orifice plate 104 is laminated on the silicon substrate 105 on which the wiring and the ink supply path 111 are formed as described above. In the orifice plate 104, ink paths and ejection ports 101 are provided at positions corresponding to individual heaters. 101-C1 is an ejection port for ejecting a large amount of cyan ink, and 101-Cs1 is an ejection port for ejecting a small amount of cyan ink. 101-M1 is an ejection port for ejecting a large amount of magenta ink, and 101-Ms1 is an ejection port for ejecting a small amount of magenta ink. Further, 101-Y1 and 101-Y2 are discharge ports for discharging a large amount of yellow ink. In this example, the large discharge amount represents 5 pl, and the small discharge amount represents 2 pl. Ink is supplied from the same ink supply paths 111C, 111M, and 111Y to large and small groups that discharge the same color ink, that is, 101-C1 and 101-Cs1, 101-M1 and 101-Ms1, and 101-Y1 and 101-Y2, respectively. Has been. Since the ink supply path 111 is formed by anisotropic etching on the silicon substrate 105 made of <100> silicon, its cross-sectional shape is trapezoidal as shown in the figure.

  Here, the example in which the orifice plate 104 and the ink path are integrally formed has been described, but a structure in which a flow path wall in which an ink path is formed is provided between the orifice plate in which only the ejection port is formed and the silicon substrate. It may be.

  Based on the recording signal received by the connecting element 109, the drive circuit 108 drives the individual heaters 107, thereby causing foaming in the ink existing on the heater surface. It is a mechanism that drops are ejected.

  Examples of the ejection port arrangement state on the orifice plate characteristic of the present invention in the ink jet recording apparatus and the ink jet recording head applicable to the present invention described above will be described below as some embodiments.

  FIG. 5 is a plan view for explaining an arrangement state of the discharge ports in the orifice plate 104 according to the first embodiment. Also in this embodiment, as in the conventional example described with reference to FIG. 10, all the 10 discharge port arrays C1, C2, M1, M2, Y1, Y2, Cs1, Cs2, Ms1, and Ms2 are half in the sub-scanning direction. Although shifted by pitch, they are arranged symmetrically about the center line A-A ′. As a result, even if a one-pass bidirectional recording operation is performed, a high-resolution image of 1200 dpi can be recorded without color unevenness.

  Hereinafter, the discharge port arrangement of the present embodiment will be described more specifically. From the discharge port arrays C1, C2, M1, M2, Y1, and Y2 with large discharge amounts of this embodiment, 5 pl of each color is discharged, and from the discharge port columns Cs1, Cs2, Ms1, and Ms2 with small discharge amounts, 2 pl of ink is ejected. Further, the distance between adjacent large discharge amount ejection port arrays (for example, C1, M1, and Y1) and the distance between adjacent small ejection amount ejection port arrays (for example, Cs1 and Ms1) are each 1.376 mm. . Furthermore, the distance between the discharge port arrays (for example, C1 and Cs1 and M1 and Ms1) of adjacent discharge port arrays of the same color other than Y1 and Y2 is 0.254 mm, but the distance between the two yellow discharge port arrays Y1 and Y2 L is 0.454 mm.

  Comparing FIG. 5 with FIG. 10, the present embodiment is characterized in that the distance L between the two yellow discharge port arrays Y1 and Y2 is longer than that in the prior art. As already described, mist and satellites floating during recording are likely to accumulate near the center line of the orifice plate 1004, and this is the same for the recording head of this embodiment. However, as in this embodiment, the two rows Y1 and Y2 arranged in contrast to the position closest to the center line A-A 'are further separated from the center line A-A' so that these discharge port rows are configured. It is possible to suppress the ink adhering to the vicinity of the center line from entering the discharge port.

  In order to confirm the effect of the present embodiment, the inventors of the present invention set the distance L of Y1 and Y2 to L = 0.454 mm, and other configurations are the same as in the present embodiment. A recording head having a distance L = 0.254 mm between Y1 and Y2 was prepared. This distance of 0.254 mm coincides with the distance between adjacent ejection port arrays of the same color, that is, the distance between C1 and Cs1 and the distance between M1 and Ms1. Then, after these two recording heads were used and a recording operation was performed under predetermined recording conditions, the occurrence of color mixing in Y1 and Y2 was confirmed for each recording head. Specifically, the ink is ejected from the individual ejection ports of the cyan nozzle rows C1 and C2 arranged symmetrically at a driving frequency of 15 KHz, and is uniformly 100% at a recording resolution of 600 dpi in the main scanning direction. The image was recorded on one A4 size recording medium. As a result, a total of 122,880,000 ejection operations were performed from the C1 and C2 ejection port arrays. Further, the distance between sheets during recording, that is, the distance between the discharge port surface of the orifice plate 104 and the recording medium was set to 1.5 mm.

  Thereafter, a uniform yellow image was recorded evenly using the ejection port arrays Y1 and Y2 without performing any maintenance process on the recording head, and the color mixture state was confirmed in the output image. As a result, the yellow image recorded with the conventional recording head with L = 0.254 mm was confirmed to have a mixed color of cyan ink, whereas the yellow image recorded with the recording head of this example with L = 0.454 mm. No color mixing was confirmed.

  As in this embodiment, in a configuration corresponding to two large ejection amount ejection port arrays in one ink supply path, if the distance L between the two columns is too short, density unevenness caused by crosstalk during ejection is caused. May be a concern. However, in the configuration in which the distance between the two ejection port arrays is further increased as in the present embodiment, the distance of the individual ink paths leading from the supply path to the individual ejection ports also increases, so that crosstalk is suppressed. The effect is also obtained.

  FIG. 6 is a plan view for explaining the arrangement state of the discharge ports in the orifice plate 104 of the second embodiment. Also in this embodiment, similarly to the conventional example and the first embodiment, the discharge port rows of all 10 rows of C1, C2, M1, M2, Y1, Y2, Cs1, Cs2, Ms1, and Ms2 are half pitch in the sub-scanning direction. Although they are shifted one by one, they are arranged in a symmetrical order. The amount of ink ejected from each ejection port array is also the same as in the conventional example and the first embodiment.

  In this embodiment, the distances between adjacent discharge port arrays of the same color, that is, C1 and Cs1, M1 and Ms1, Y1 and Y2, Ms2 and M2, and Cs2 and C2 are all equal to 0 in the conventional example. 254 mm. Further, as shown in the figure, assuming that the center lines between adjacent ejection port arrays of the same color are c1, m1, y1, m2, and c2, and their distances are D1, D2, D3, and D4, D1 = D2 = D4 = 1.376 mm. On the other hand, D3 is 2.003 mm which is larger than this. By doing so, conventionally, Y1 and Y2 closest to the center line were only 0.0254 mm / 2 = 0.127 mm away from the center line, but in this embodiment, the center line BB ′ is separated from the center line. Even the closest Y2 is arranged at a position 0.5 mm away from the center line.

  As already described, the portion where mist and satellite are likely to adhere is in the vicinity of the center line of the two ejection port arrays having the same color and the same ejection amount. Therefore, with regard to cyan and magenta, the largest amount of ink is likely to adhere to the vicinity of BB ′ for both the large ejection amount ejection port array and the small ejection amount ejection port array. Therefore, as shown in the present embodiment, the yellow discharge port array located closest to the center line is arranged at a position sufficiently spaced from the center line while being close to one side of the center line as shown in the figure. By doing so, it is possible to avoid color mixing in yellow.

  In the case of this example, the adhesion of the ink accompanying the ejection of the yellow ejection port rows Y1 and Y2 is the position of the center line of Y1 and Y2 that deviates from the center line BB ′. However, even if the yellow ink attached here enters the ejection discharge port arrays Y1 and Y2 that perform the same ink, no color mixing occurs. Therefore, also in the present embodiment, the same effect as in the first embodiment can be obtained.

  In order to confirm the effect of the present embodiment, the inventors of the present invention set D3 = 2.003 mm, and the other configuration is the same as that of the present embodiment, while D1 = D2 = D3. A recording head with D4 = 1.376 mm was prepared. Then, after these two recording heads were used and a recording operation was performed under the same recording conditions as in Example 1, the occurrence of color mixing in Y1 and Y2 was confirmed for each recording head. As a result, in the yellow image recorded by the conventional recording head of D3 = 1.376 mm, the mixed color of cyan ink was confirmed, whereas the yellow image recorded by the recording head of this example in which D3 = 2.003 mm was obtained. No color mixing was confirmed.

  FIG. 7 is a plan view for explaining an arrangement state of the discharge ports in the orifice plate 104 of the third embodiment. In this embodiment as well, as in the conventional example and the above-described embodiments, all the 10 ejection port rows of C1, C2, M1, M2, Y1, Y2, Cs1, Cs2, Ms1, and Ms2 have a half pitch in the sub-scanning direction. Although they are shifted one by one, they are arranged in parallel in a predetermined order. The amount of ink ejected from each ejection port array is also the same as in the conventional example and the first embodiment.

  In this embodiment, the center line of the two ejection port arrays prepared for each ejection amount of each color is set so that the ink application order to the recording medium is equal in the forward direction and the backward direction in bidirectional recording. They are arranged so as not to coincide with the center line of the orifice plate.

  Hereinafter, the arrangement state of the individual ejection port arrays will be specifically described. In the conventional example shown in FIGS. 10, 6, and 7 and the above-described embodiment, in order from the outside, for large cyan droplets, for small cyan droplets, for large magenta droplets, for small magenta droplets The individual discharge port arrays were arranged in the order for large yellow droplets. In such a configuration, the center line coincides with the center line of the orifice plate 104 in all ink colors and all discharge amounts. On the other hand, in the present embodiment shown in FIG. 7, the outermost arrangement is an ejection port array with a large cyan discharge amount on one side, but an ejection port array with a small cyan ejection amount on the other side. ing. On the inner side, the small ejection amount row of cyan and the large ejection amount row of cyan are arranged on the left and right, respectively. Further, the magenta large discharge amount and the small discharge amount discharge port arrays arranged on the inner side also have the same arrangement relationship as the above cyan. In such a configuration, the center line of the two discharge port arrays that discharge the same color and the same discharge amount, that is, the portion where a lot of mist generated by the discharge operation of these discharge port arrays adheres is the center of the orifice plate 104. As a result, the line C-C 'is shifted to the left or right.

  For example, in FIG. 7, the center lines of C1 and C2 that discharge a large amount of cyan discharge are shifted to the left with respect to the center line CC ′ of the orifice plate, and are positioned between Ms1 and Y1. The center lines of Cs1 and Cs2, which discharge a small amount of cyan, are shifted to the right with respect to the center line C-C 'of the orifice plate, and are positioned between M2 and Y2. Further, the center lines of M1 and M2 that discharge a large amount of magenta are shifted to the left with respect to the center line CC ′ of the orifice plate, and are positioned between Ms1 and Y1. Further, the center lines of Ms1 and Ms2 that discharge a small amount of magenta are shifted to the right with respect to the center line CC ′ of the orifice plate so as to be positioned between M2 and Y2. In this embodiment, the center line of cyan and magenta can be obtained by bringing the two yellow discharge port arrays close to each other at the approximate center of the orifice plate close to each other while the center line position is varied for each discharge amount of each color. The line is set so as to be out of between the yellow outlet rows.

  Specific numerical values are shown below with reference to the drawings. In this embodiment, the distance D7 between the cyan and magenta adjacent ejection port arrays is 0.75 mm, while the distance D8 between the yellow ejection port arrays Y1 and Y2 is 0.254 mm. Further, the distances D1, D2, D3, and D4 of the center lines c1, m1, y1, m2, and c2 between the adjacent discharge port arrays of the same color are all equal to 1.376 mm. In such a configuration, the yellow discharge port rows Y1 and Y2 deviate from the individual center lines of cyan and magenta, and a distance of 0.248 mm can be set even in the closer discharge port row. This is a distance approximately double that of the conventional example of 0.127 mm.

  In order to confirm the effect of this embodiment, the present inventors use the recording head of this embodiment shown in FIG. 7 and the recording head of the conventional example, and perform the recording operation under the same recording conditions as in Embodiment 1. Then, the occurrence of color mixing in Y1 and Y2 was confirmed for each recording head. As a result, a mixed color of cyan ink was confirmed in the yellow image recorded by the conventional recording head, whereas no mixed color was confirmed in the yellow image recorded by the recording head of the present embodiment shown in FIG. .

  FIG. 8 is a plan view showing an arrangement state of the discharge ports for explaining a modification of the present embodiment. The method for shifting the center line of the discharge amount of each color from the center line of the orifice plate 104 while keeping the order of ink application to the recording medium during bidirectional recording is not limited to the arrangement shown in FIG. In FIG. 8, the arrangement of the discharge port arrays M1 and M2 with a large discharge amount of magenta and the discharge ports Ms1 and Ms2 with a small discharge amount is further changed from that in FIG. An example in which the positions are made different is shown. Specifically, the center lines of C1 and C2 that discharge large cyan droplets are shifted to the left with respect to the center line C-C 'of the orifice plate, and the center lines of Cs1 and Cs2 that discharge small cyan droplets are Shift to the right with respect to the center line CC ′ of the orifice plate. Also, the center lines of M1 and M2 that discharge large magenta droplets are shifted to the right with respect to the center line CC ′ of the orifice plate, and the center lines of Ms1 and Ms2 that discharge magenta small droplets are the center lines of the orifice plate. Shift to the left with respect to the center line CC ′. Even in such an arrangement state, the effect of the present embodiment can be obtained as in FIG.

  In each of the three embodiments described above, in any case, the center line between the two discharge port arrays (the first discharge port array and the second discharge port array) of the same color and the same discharge amount is all the discharge ports. Each discharge row is arranged so as to be at a predetermined distance or more from the row. That is, the ejection port arrays for the respective colors are arranged so as to be out of the region where ink is most likely to adhere by the first ejection port array and the second ejection port array having the same color and the same ejection amount. According to the earnest study by the present inventors, it was confirmed that such a predetermined distance is preferably 0.2 mm or more.

  In the above-described embodiments, the description has been given of the configuration in which the three colors of cyan, magenta, and yellow are used and the yellow is arranged in the center. However, the present invention is not limited to this. If the arrangement is such that the ink application sequence to the mourning recording medium is the same in both the forward and backward directions when performing bidirectional recording, use more ink colors and more appropriate amounts of liquids Alternatively, the arrangement order may not be centered on yellow. Further, even with a recording head configuration in which the ink droplet amount is not prepared in a plurality of stages, for example, a recording head as shown in FIG. 9, the effects of the present invention described in the first and second embodiments can be obtained. I can do it.

1 is a perspective view for explaining an internal configuration of a serial type color ink jet recording apparatus applicable to the present invention. FIG. 4 is a diagram for explaining how three ink tanks are independently attached to and detached from a recording head. FIG. 3 is a diagram for explaining the configuration of a recording head in detail. (A) And (b) is the top view and sectional drawing for demonstrating the structure of a recording element board | substrate. 4 is a plan view for explaining an arrangement state of discharge ports in the orifice plate of Embodiment 1. FIG. 6 is a plan view for explaining an arrangement state of discharge ports in an orifice plate of Example 2. FIG. 6 is a plan view for explaining an arrangement state of discharge ports in an orifice plate of Example 3. FIG. FIG. 10 is a plan view for explaining another example of the arrangement state of the discharge ports in the orifice plate of the third embodiment. FIG. 5 is a schematic diagram for explaining an arrangement example of ejection openings in a symmetric recording head. FIG. 10 is a schematic diagram for explaining another configuration example of a symmetric recording head. It is a figure for demonstrating the adhesion state of the ink mist in an orifice plate after recording a uniform image with a predetermined frequency using all the ejection opening arrays.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Recording head 101 Discharge port 104 Orifice plate 105 Silicon substrate 107 Heater 108 Drive circuit 109 Connection element 110 Recording element substrate 111 Ink supply path 200 Inkjet recording apparatus 201 Carriage 202 Ink tank 204 Screw shaft 205 Conveyance roller

Claims (1)

A plurality of ejection port arrays in which ejection ports for ejecting ink are arranged, an integral orifice plate configured in parallel in a direction intersecting the direction of the arrangement, and provided corresponding to the ejection ports; In an inkjet recording head having an integrated substrate including a plurality of elements that generate energy used to eject ink,
The plurality of ejection port arrays include at least a first ejection port array and a second ejection port array that eject ink of the same color and the same ejection amount,
A center line extending in the direction of the arrangement in the middle between the first discharge port array and the second discharge port array is disposed at a distance of 0.2 mm or more with respect to any of the plurality of discharge port arrays, The plurality of ejection port arrays are arranged in parallel so that the order in which the ink colors are arranged is the same in both the forward direction and the backward direction in the direction intersecting the arrangement direction ,
The plurality of ejection port arrays include first and second ejection port arrays that eject ink of the first color from one end side to the other end side of the orifice plate in a direction intersecting the arrangement direction. A third group of ejection port groups, a second group of ejection ports comprising two rows of ejection port rows in parallel to eject ink of the second color, and a third group of ejection port rows in parallel to eject ink of the first color. It is arranged in the order of the discharge port group,
The distance between the center line of the two ejection port arrays in the first ejection port group and the center line of the two ejection port arrays in the second ejection port group, and 2 in the second ejection port group. An ink jet recording head, characterized in that an interval between a center line of the discharge port array and a center line of two discharge port arrays in the third discharge port group is different .

Images