JP2005305959A - Ink-jet recording head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink-jet recording head capable of performing the operation of high-speed printing with making the best use of the effect acquired by enlarging the printing width. <P>SOLUTION: The ink-jet recording head keeps two groups of recording-element substrate separately arranged in the direction of driving a carriage, in which group the recording-element substrate having two or more nozzles for discharging a liquid and two or more recording elements generating a discharging energy are arranged in proximity. The recording-element substrates to which the same kind of ink is fed are arranged in a bilateral symmetry in relating to the carriage driving direction with bordering the center of the two groups of the recording element substrate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an ink jet recording head mounted on an ink jet recording apparatus that performs recording by discharging a recording liquid onto a recording paper.

  The ink jet recording apparatus is a so-called non-impact recording type recording apparatus. High-speed recording and recording on various recording media are possible, and there is a feature that noise during recording hardly occurs. For this reason, it is widely adopted as a device that bears a recording mechanism such as a printer, a word processor, a facsimile machine, and a copying machine.

  Inkjet recording is a method in which minute droplets are ejected from minute ejection ports and recording is performed on a recording paper. A typical method is a method using an electrothermal conversion element. Such ink jet recording is generally composed of an ink jet recording head having nozzles for forming droplets and a supply system for supplying ink to the head. In an ink jet recording head using an electrothermal conversion element, an electrothermal conversion element is provided in a pressurizing chamber, and an electric pulse serving as a recording signal is applied thereto to give thermal energy to the recording liquid. The bubble pressure at the time of foaming (boiling) of the recording liquid caused by the change is used for ejecting recording droplets.

  In recent years when many recording devices are used, in order to realize high-definition image recording at a higher speed, an inkjet recording head having a wider print width is required, and a plurality of recording element substrates are arranged in the sub-scanning direction. Thus, it has been proposed to form a plurality of lines of images in a single scan. Then, when arranging multiple recording element substrates in the sub-operation direction so as not to cause streak / unevenness in the image of the connecting portion between adjacent recording element substrates, the adjacent recording element substrates overlap each other. A method of staggering so as to have overlapping regions is disclosed. For example, Japanese Patent Application Laid-Open No. 5-57965 discloses an overlapping area process at this time. In this patent, the number of recording elements used in the overlapping area is gradually reduced, and the recording head is gradually increased in the overlapping area of the other recording element substrate that shares the overlapping area with each other, corresponding to the front end portion. A technique for preventing the recorded images in the overlapping region from becoming abruptly discontinuous is disclosed.

However, with the above head, high-speed printing becomes possible as the print width becomes wider due to the increase in the number of nozzles. However, when two different types of ink are applied adjacent to recording paper during high-speed printing, the inks However, there is a problem that a phenomenon (bleeding) occurs in which the quality of the color image is deteriorated by mixing at the boundary portion. In particular, color mixing at the boundary between black ink and color ink has a large effect on image quality degradation, and various solutions have been studied. A typical solution is that an ink set and a recording medium have a mechanism for preventing bleeding when at least one of the coloring materials is aggregated or precipitated when two types of ink are applied to the recording paper adjacent to each other. Is the method.
Japanese Patent Laid-Open No. 5-57965

  As described above, in the above configuration, the effect of widening the printing width cannot be fully utilized for high-speed printing due to the influence of bleeding. For this reason, it has been difficult to realize higher-speed printing with the above-described prior art in an inkjet recording head that requires higher-speed printing in addition to recent photographic image quality.

  Accordingly, the present invention has been made paying attention to the problems of the prior art described above, and an inkjet recording head having a configuration in which the effect of the printing width is maximized for high-speed printing in an inkjet recording head having a wide printing width. The purpose is to provide.

  In order to achieve the above object, there are at least two recording element substrate groups in which a plurality of recording element substrates in which a plurality of nozzles for discharging liquid and a plurality of recording elements for generating discharge energy are arranged are arranged close to each other. Each recording element substrate group is separated in the carriage driving direction and is shifted in a direction parallel to the arrangement direction of the recording elements in the recording element substrate, and the recording element substrate to which the same ink type is supplied. In the ink jet recording head in which the ink is arranged away from each other in the carriage driving direction, the ink types supplied to the arranged recording element substrates are symmetrical with respect to the center.

  According to the present invention, when printing is performed by reciprocation of the carriage, it is possible to make the order of the ink types to be printed on the recording paper the same, and to prevent color unevenness. Therefore, it is possible to provide an ink jet recording head capable of performing high-speed printing that makes the most of the effect of widening the printing width.

  In addition, when the ink type supplied to the arranged recording element substrates is the same ink type only in the center, preferably black ink, when printing is often performed with only one color such as text (black etc.), It is possible to provide an ink jet recording head capable of reducing the range of movement of the carriage on which the ink jet recording head is mounted and being capable of high-speed printing while being hardly affected by the recording element substrates being arranged apart from each other.

  In addition, when the reactive ink type often used for high-speed printing is used, the ink serving as the base can be printed on the paper first, regardless of whether the carriage on which the head is mounted moves in the reciprocating direction. Therefore, an ink jet recording head capable of high speed printing can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

(Device body)
1 and 2 show a schematic configuration of a printer using an ink jet recording method. In FIG. 1, the outer shell of the printer apparatus main body M1000 in this embodiment includes an exterior member including a lower case M1001, an upper case M1002, an access cover M1003, and a discharge tray M1004, and a chassis M3019 ( (See FIG. 2).

  The chassis M3019 is composed of a plurality of plate-shaped metal members having a predetermined rigidity, forms a skeleton of the recording apparatus, and holds each recording operation mechanism described later. The lower case M1001 forms a substantially lower half part of the outer shell of the apparatus main body M1000, and the upper case M1002 forms a substantially upper half part of the outer shell of the apparatus main body M1000. It has a hollow body structure having a storage space for storing each mechanism. An opening is formed in each of the upper surface portion and the front surface portion of the apparatus main body M1000.

  Further, one end of the discharge tray M1004 is rotatably held by the lower case M1001, and the opening formed on the front surface of the lower case M1001 can be opened and closed by the rotation. For this reason, when executing the recording operation, the discharge tray M1004 is rotated to the front side to open the opening so that the recording sheets can be discharged and the discharged recording sheets P are sequentially stacked. It has come to be able to do. The paper discharge tray M1004 stores two auxiliary trays M1004a and M1004b. By pulling out each tray as necessary, the paper support area can be expanded or reduced in three stages. It has become.

  One end of the access cover M1003 is rotatably held by the upper case M1002, and can open and close an opening formed on the upper surface. By opening the access cover M1003, the access cover M1003 is housed inside the main body. It is possible to replace the print head cartridge H1000 or the ink tank H1900. Although not specifically shown here, when the access cover M1003 is opened and closed, the protrusion formed on the back surface rotates the cover opening and closing lever, and the rotation position of the lever is detected by a micro switch or the like. Thus, the open / closed state of the access cover can be detected.

  On the upper surface of the rear part of the upper case M1002, a power key E0018 and a resume key E0019 are provided so that they can be pressed, and an LED E0020 is provided. When the power key E0018 is pressed, the LED E0020 lights up and recording is possible. This is to inform the operator. The LED E0020 also has various display functions such as changing the blinking method and color and notifying the operator of printer troubles. Further, the buzzer E0021 (FIG. 5) can be leveled. When the trouble is solved, the recording is resumed by pressing the resume key E0019.

  Next, the recording operation mechanism in the present embodiment that is housed and held in the printer main body M1000 will be described.

  As a recording operation mechanism in the present embodiment, an automatic feeding unit M3022 that automatically feeds the recording sheet P into the apparatus main body, and a recording sheet P that is sent one by one from the automatic feeding unit are recorded in a predetermined manner. A conveyance unit M3029 for guiding the recording sheet P from the recording position to the discharge unit M3030, a recording unit for performing desired recording on the recording sheet P conveyed to the recording position, and a recovery process for the recording unit And a recovery unit (M5000).

Here, the recording unit will be described. The recording unit includes a carriage M4001 that is movably supported by a carriage shaft M4021, and a recording head cartridge H1000 that is detachably mounted on the carriage M4001.
First, a recording head cartridge used in the recording unit will be described with reference to FIGS.

  The recording head cartridge H1000 in this embodiment includes an ink tank H1900 that stores ink and a recording head H1001 that ejects ink supplied from the ink tank H1900 from nozzles according to recording information, as shown in FIG. . The recording head H1001 adopts a so-called cartridge system that is detachably mounted on a carriage M4001 described later.

  In the recording head cartridge H1000 shown here, for example, black, light cyan, light magenta, cyan, magenta and yellow ink tanks H1900 are prepared as ink tanks in order to enable high-quality color recording with photographic tone. As shown in FIG. 4, each is detachable from the recording head H1001.

(carriage)
Next, a carriage M4001 on which the recording head cartridge H1000 is mounted will be described with reference to FIG.

  As shown in FIG. 2, the carriage M4001 is engaged with a carriage cover M4002 for guiding the recording head H1001 to a predetermined mounting position on the carriage M4001, and a tank holder H1500 of the recording head H1001, and the recording head H1001 is predetermined. There is provided a head set lever M4007 that presses to be set at the mounting position. That is, the head set lever M4007 is provided at the upper part of the carriage M4001 so as to be rotatable with respect to the head set lever shaft, and a spring-set head set plate (not shown) is provided at the engaging portion with the recording head H1001. It is provided via a spring, and is configured to be mounted on the carriage M4001 while pressing the recording head H1001 by this spring force.

  A contact flexible print cable (refer to FIG. 5; hereinafter referred to as a contact FPC) E0011 is provided at another engaging portion of the carriage M4001 with the recording head H1001, and is provided on the contact portion on the contact FPC E0011 and the recording head H1001. The contact portion (external signal input terminal) H1301 is in electrical contact, and can exchange various information for recording, supply power to the recording head H1001, and the like.

  Here, an elastic member such as rubber (not shown) is provided between the contact portion of the contact FPC E0011 and the carriage M4001, and the contact portion and the carriage M4001 are connected by the elastic force of the elastic member and the pressing force by the headset lever spring. It is designed to enable reliable contact. Further, the contact FPC E0011 is connected to a carriage substrate E0013 mounted on the back surface of the carriage M4001 (see FIG. 5).

  A first embodiment of the ink jet recording head in the ink jet recording apparatus described above will be described below.

  FIG. 12 is a partially exploded perspective view for explaining the configuration of the recording element substrate 1100.

  In the recording element substrate H1100, a plurality of recording elements, a plurality of ink flow paths corresponding to the recording elements, and a plurality of ejection ports H1100T are formed by photolithography, and the ink supply ports are opened on the back surface. Is formed. In addition, the recording element substrate H1100 is, for example, a side shooter type, and is configured by a single substrate. In the substrate, the plurality of ejection openings H1100T formed in two rows in a staggered pattern are formed, for example, at about 1200 dpi for each ink color, and eject inks of different ink colors.

  In the recording head of this embodiment, as will be described later with reference to FIGS. 13A to 13H, the air generated in the ink by the electrothermal transducer 13 (H1103) generating thermal energy communicates with the atmosphere. A so-called atmospheric communication type in which ink is discharged as droplets from the discharge outlet is preferably used. FIGS. 13A to 13H are diagrams showing an example of a discharge state by the air communication method in time series. As shown in these drawings, the bubbles 301 generated by the electrothermal transducer 13 communicate with the atmosphere before the droplets fly away from the head (FIG. 13 (h)) (FIG. 13 (f)). There is no defoaming process, and as a result, the gas-liquid interface 301a behind the bubble 301 moves backward with the foaming of the liquid and the growth of the bubble. As the gas-liquid interface 301a moves backward, the rear liquid is pushed back toward the ink supply path.

  For example, as shown in FIG. 12, the recording element substrate H1100 includes a Si substrate 1101 having a thin film formed on the surface thereof and an orifice plate H1112 formed on the substrate 1101.

  The substrate 1101 has, for example, a thickness of 0.5 to 1 (mm), and ink supply ports H1102 including long groove-like through ports are integrally formed in parallel with each other as ink channels. The distance between the adjacent ink supply ports H1102 is set to about 2.5 mm, for example. Since the mutual distance is relatively small as described above, the recording head can be reduced in size. On both sides of each ink supply port H1102, a plurality of electrothermal conversion elements H1103 as recording elements are arranged in a zigzag pattern, for example, approximately 1200 dpi for each ink color.

  A plurality of electrothermal transducers H1103 formed on the substrate 1101 and electrical wiring such as Al for supplying electric power to each electrothermal transducer H1103 (not shown in FIG. 12) are formed by a film forming technique. Yes. Moreover, the electrode part H1104 for supplying electric power to the electric wiring is formed along the end in the direction orthogonal to the arrangement direction of the electrothermal conversion elements H1103. The electrode portion H1104 is provided with a plurality of bumps H1105 such as gold corresponding to the electrode terminals H1302 of the electric wiring board H1300 described above.

  The ink supply port H1102 is formed, for example, by performing anisotropic etching using the crystal plane orientation of the Si substrate 1101. When the crystal plane orientation is <100> on the wafer surface and <111> in the thickness direction, an angle of about 54.7 degrees (surface to be etched) is obtained by alkaline etching (KOH, TMAH, humanradine, etc.) Etching proceeds at the inner angle of the rising edge. By using this method, the ink supply port H1102 is formed by etching to a desired depth.

  Further, as shown in FIG. 12, the orifice plate H1112 formed on the substrate H1101 has an ink channel wall H1106 and an ejection port 1100T for forming an ink channel corresponding to each electrothermal conversion element H1103. Are formed by photolithography. Accordingly, the adjacent ejection ports 1100T are partitioned from each other by the ink flow path wall H1106.

  An ejection port H1100T row corresponding to each ink supplied from each ink supply port H1102 is integrally formed in one orifice plate H1105. Similar to the arrangement of the electrothermal conversion elements H1103, a plurality of the ejection port H1100T rows are arranged in a staggered manner, for example, about 1200 dpi for each ink color. That is, the discharge port H1100T is provided to face the electrothermal conversion element H1103.

  These recording heads are moved back and forth in the main scanning direction (carriage moving direction), for example, and controlled by the drive circuit described above to perform recording on the recording medium.

  A first embodiment of the present invention in which the recording element substrates supplied with the same ink type shown in FIGS. 6 and 7 are separated from each other in the main scanning direction will be described. FIG. 6 is a perspective view showing the external configuration of the ink jet recording head of the present invention. FIG. 7 is an enlarged view of the face surface of FIG. 6 and shows a simplified arrangement of the recording element substrate. As shown in FIG. 7, the ink types supplied to the recording element substrate are configured to be symmetrical with respect to the center. In FIG. 7, the inkjet recording head H1000Bk is a recording head for black ink, the recording head H1000C is for cyan ink, the recording head H1000M for magenta ink, the recording head H1000Y is for yellow ink, and the recording head H1000LC is for light cyan ink, recording. The head H1000LM is for light magenta ink. With such an arrangement of the recording element substrate, when printing is performed by reciprocation of the carriage, the order of ink types (color ink type and black ink order) applied to the recording paper becomes the same, and color unevenness occurs. Can be prevented. Conventionally, when reciprocal printing is performed, the order of the types of ink applied to the recording paper is different between the forward path and the backward path, resulting in color unevenness. Therefore, in order to keep the order of the ink types to be printed on the recording paper and to prevent color unevenness, printing is performed in one direction of either the forward path or the backward path of the carriage. FIG. 8 shows a comparison of the printing process between the first embodiment of the present invention and a conventional head having the same printing width. As can be seen from FIG. 8, in this embodiment, printing of three times the nozzle width is completed while the recording head reciprocates twice. On the other hand, in the conventional example, since only one-way printing can be performed, the print width that is completed after two reciprocations is twice the nozzle width. For this reason, even if the printing width is increased, the effect cannot be fully utilized for high-speed printing.

  In the configuration described above, when the number of nozzles is increased and the printing width is increased in order to perform high-speed printing, the recording element substrates to which the same ink type is supplied are separated in the main scanning direction, and are arranged in an array. With the configuration in which the ink types supplied to the substrate are symmetric with respect to the center, the order of ink type placement is the same even when reciprocal printing is performed, so that occurrence of color unevenness can be suppressed. As a result, the effect of widening the print width can be utilized to the maximum in high-speed printing. Therefore, it is possible to provide an ink jet recording head having improved throughput as compared with a conventional ink jet recording head having the same print width.

  FIG. 9 is a diagram for explaining a second embodiment of the present invention. In the second embodiment, as in the ink jet recording head shown in the first embodiment, the ink type supplied to the recording element substrate in the central portion of the symmetrical arrangement is black ink.

  FIG. 9 is a diagram comparing the range of movement of the carriage during printing using mainly black ink between the second embodiment and the example in which black ink is disposed outside the symmetrical arrangement. From this figure, it can be seen that when the black ink is supplied to the recording element substrate in the central portion as in the second embodiment, the range of movement of the carriage is minimal and the printing time can be shortened. . In other words, by adopting the above configuration, in the case of text printing, in which printing is usually performed with only one black ink, it is not affected by the fact that the recording element substrates supplied with the same ink type are arranged apart from each other. It is possible to reduce the range of movement of the carriage on which the ink jet recording head is mounted.

  In the configuration described above, when the number of nozzles is increased and the printing width is increased to perform high-speed printing, the recording element substrate to which the same ink type is supplied is separated, and the ink supplied to the central recording element substrate Since the ink type is the same, and the ink is black ink, the range of movement of the carriage equipped with the inkjet recording head is reduced during text printing, which is often printed with black ink. A fast ink jet recording head can be provided.

  FIG. 10 is a diagram for explaining a third embodiment of the present invention. FIG. 10 is an enlarged view of the face surface of FIG. 6 to simplify the arrangement of the recording element substrate. As shown in FIG. 10, the ink types supplied to the recording element substrate with respect to the center are configured to be symmetrical. In FIG. 10, the inkjet recording head H1000Bk is a recording head for black ink, the recording head H1000C is for cyan ink, the recording head H1000M for magenta ink, the recording head H1000Y is for yellow ink, and the recording head H1000LC is for light cyan ink, recording. The head H1000LM is for light magenta ink. And one of these ink types, for example, a color ink type contains a precipitating agent (for example, a polyvalent metal salt), and another ink, for example, a black ink in the form of an organic dye having a carboxyl or carboxylate group. Adopt a colorant. Printing these inks next to each other causes precipitation of the colorant with a precipitant, thereby preventing migration of the colorant to other inks and reducing bleeding between two adjacent print areas. . (Reactive Ink-US Pat. No. 5,428,383, etc.) When such a reactive ink type is used, the recording paper is also used when printing is performed by reciprocation of the carriage due to the arrangement of the recording element substrate shown in the third embodiment. The order of the ink type to be applied to the ink (the color ink type having the precipitating agent as the base and the order of the black ink having the carboxyl or carboxylate group to be applied later) can be made the same, and the occurrence of bleeding Can be prevented. Conventionally, when reciprocal printing is performed, bleeding occurs because the order of ink types to be printed on the recording paper differs between the forward path and the backward path. Therefore, in order to keep the order of the ink types to be printed on the recording paper and to prevent bleeding, printing is performed in one direction of either the forward or backward path of the carriage. In FIG. 10, the printing process of the conventional head having the same print width is compared with the third embodiment of the present invention. As can be seen from this figure, in this embodiment, the recording head is moved back and forth twice. In addition, printing that is three times the nozzle width is completed. On the other hand, in the conventional example, since only one-way printing can be performed, the print width that is completed after two reciprocations is twice the nozzle width. For this reason, when the reactive ink type is used for the purpose of high-speed printing by widening the printing width, the effect cannot be fully utilized for high-speed printing.

  In the configuration described above, when the number of nozzles is increased and the printing width is increased in order to perform high-speed printing, the recording element substrates to which the same ink type is supplied are separated in the main scanning direction, and are arranged in an array. With the configuration in which the ink types supplied to the substrate are symmetric with respect to the center, the order of ink type placement is the same even when reciprocal printing is performed, so that occurrence of bleeding can be suppressed. As a result, the effect of widening the print width can be utilized to the maximum in high-speed printing. Therefore, it is possible to provide an ink jet recording head having improved throughput as compared with a conventional ink jet recording head having the same print width.

  FIG. 11 is a diagram for explaining a fourth embodiment of the present invention. FIG. 11 is an enlarged view of the face surface of FIG. 6 to simplify the arrangement of the recording element substrate, as in FIG. In the fourth embodiment, in the ink jet recording head shown in the first embodiment, the recording element substrates to which all ink types are supplied are arranged apart from each other.

  By taking the above configuration, for printing such as patterns that use many of the same ink type, because the recording element substrate that discharges the same ink type is far apart, the heat storage is more dispersed to suppress the temperature rise, Even when printing with high density, high-speed printing is possible without reducing the throughput. Further, since the arrangement of the recording element substrate to which the ink type is supplied is the same as that in the second embodiment, the range of movement of the carriage on which the ink jet recording head is mounted can be increased during text printing, which is often printed with black ink. It is possible to reduce the printing throughput due to the separation of the recording element substrate. Furthermore, since the order of ink placement is the same during reciprocal printing, high-speed printing is possible without causing color unevenness. Further, when the reactive ink type is used, the printing order of the ink type is the same during the reciprocal printing, so that high-speed printing is possible without causing bleeding.

  In the configuration shown above, when the number of nozzles is increased and the print width is increased to perform high-speed printing, the recording element substrates are separated from each other. It is possible to further reduce the temperature rise by dispersing heat storage, to prevent color unevenness, and to prevent beading when using a kind of reactive ink. For this reason, it is possible to provide an ink jet recording head capable of performing high-speed printing without reducing throughput even when printing with high density printing.

1 is a perspective view illustrating an external configuration of an inkjet printer according to an embodiment of the present invention. It is a perspective view which shows the state which removed the exterior member of the printer shown in FIG. 1 is a perspective view showing a state in which a recording head cartridge used in a printer according to an embodiment of the present invention is assembled. FIG. FIG. 4 is an exploded perspective view showing the recording head cartridge shown in FIG. 3. 1 is a block diagram schematically showing an overall configuration of an electrical circuit in a printer according to an embodiment of the present invention. 1 is a perspective view showing an ink jet recording head according to a first embodiment of the present invention. FIG. 3 is an enlarged simplified view showing a recording element substrate arrangement of the ink jet recording head according to the first embodiment of the present invention. (A) (b) It is the figure which compared the printing process of the inkjet recording head by 1st embodiment of this invention, and the head of a prior art example. It is a figure which shows the carriage movement range at the time of the printing of the inkjet recording head by 2nd embodiment of this invention. (A) (b) It is the figure which compared the printing process of the inkjet recording head by 3rd embodiment of this invention, and the head of a prior art example. It is an expansion simplification figure which shows the printing element board | substrate arrangement | positioning of the inkjet recording head by 4th embodiment of this invention. FIG. 2 is a partially broken perspective view showing a main part of a recording head according to an embodiment of the present invention. (A), (b), (c), (d), (e), (f), (g), and (h) are cross-sectional views for explaining the ink discharge state by the air communication method in time series. It is.

Explanation of symbols

M1000 device main body M1001 lower case M1002 upper case M1003 access cover M1004 discharge tray M2015 paper gap adjustment lever M2003 paper discharge roller M3001 LF roller M3019 chassis M3022 automatic feeding unit M3029 transport unit M3030 discharge unit M4001 carriage head M4007 carriage cover M4001 carriage head Carriage shaft M5000 Recovery unit E0001 Carriage motor E0002 LF motor E0003 PG motor E0004 Encoder sensor E0005 Encoder scale E0006 Ink end sensor E0007 PE sensor E0008 GAP sensor (inter-paper sensor)
E0009 ASF sensor E0010 PG sensor E0011 Contact FPC (flexible printed cable)
E0012 CRFFC (flexible flat cable)
E0013 Carriage board E0014 Main board E0015 Power supply unit E0016 Parallel I / F
E0017 Serial I / F
E0018 Power key E0019 Resume key E0020 LED
E0021 Buzzer E0022 Cover sensor H1000 Recording head cartridge H1001 Recording head H1100 Recording element substrate H1100T Discharge port H1300 Electrical wiring substrate H1900 Ink tank 11 Discharge port 12 Flow path 13 Electrothermal conversion element 14 Orifice plate

Claims (8)

A plurality of nozzles for discharging a liquid and at least two recording element substrates each having a plurality of recording element substrates in which a plurality of recording elements for generating discharge energy are arranged and arranged in proximity to each other; The groups are arranged apart from each other in the carriage driving direction and in a direction parallel to the arrangement direction of the recording elements in the recording element substrate, and the recording element substrates supplied with the same ink type are separated in the carriage driving direction. In the inkjet recording heads arranged in such a manner,
An ink jet recording head, wherein ink types supplied to the arrayed recording element substrates are symmetrical with respect to a center.   2. The ink jet recording according to claim 1, wherein, in the ink jet recording head, the ink type supplied to the central recording element substrate is black ink among the ink types supplied to the arranged recording element substrates. head.   2. The ink jet recording head according to claim 1, wherein the ink jet recording head has two or more types of ink supplied to the arrayed recording element substrates.   2. The ink jet recording head according to claim 1, wherein the ink type supplied to the arrayed recording element substrates is a reactive ink type. 3. A plurality of nozzles for discharging a liquid and at least two recording element substrates each having a plurality of recording element substrates in which a plurality of recording elements for generating discharge energy are arranged and arranged in proximity to each other; The groups are arranged apart from each other in the carriage driving direction and in a direction parallel to the arrangement direction of the recording elements in the recording element substrate, and the recording element substrates supplied with the same ink type are separated in the carriage driving direction. In the inkjet recording heads arranged in such a manner,
The recording element substrates supplied with different ink types are arranged adjacent to each other, and the ink types supplied to the arranged recording element substrates are symmetrical with respect to the center. Inkjet recording head.   6. The ink jet recording according to claim 5, wherein the ink type supplied to the central recording element substrate in the ink jet recording head is black ink. head.   6. The ink jet recording head according to claim 5, wherein the ink jet recording head has two or more types of ink supplied to the arrayed recording element substrates.   6. The ink jet recording head according to claim 5, wherein the ink type supplied to the arrayed recording element substrates is a reactive ink type.

Images