JP2008044170A - Liquid droplet jet head and liquid droplet jet device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a miniaturized liquid droplet jet head of improve operation speed and quality. <P>SOLUTION: This liquid droplet jet head comprises a nozzle array, ejection chambers 2, 200, a plurality of common liquid droplet chambers 4, 3, 400, 300, diaphragms 7, 70, and a drive means. The plurality of common liquid droplet chambers 4, 3, 400, 300 form a lamination structure by laminating them. The plurality of ejection chambers 2, 200 are coupled to the common liquid droplet chambers 4, 3, 400, 300 to form a plurality of liquid droplet ejection sections w, x, y, z. The ejection chambers 2, 200 of each of the liquid droplet ejection sections w, x, y, z are arranged in a nozzle array direction, and nozzle holes 11, 110 communicating to the ejection chambers 2, 200 of each of the liquid droplet ejection sections w, x, y, z are arranged in a line. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a droplet discharge head and a droplet discharge device.

  In a conventional inkjet head, a plurality of single color pressure chambers (discharge chambers) are arranged in a predetermined order to form a pressure chamber block, and a plurality of pressure chamber blocks are arranged in a line to form a multicolor pressure chamber. Was. Each single color pressure chamber included in the multicolor pressure chamber is supplied with ink of a predetermined color via an ink supply path from a common ink flow path for each ink color arranged parallel to the arrangement direction of the pressure chamber blocks. . In this way, when nozzles that discharge different colors are alternately arranged, the printing speed is improved and the printing quality is improved (see, for example, Patent Document 1).

JP 7-329294 A (page 4-5, FIG. 2, FIG. 3)

  In the conventional ink jet head, a plurality of common ink chambers and corresponding flow paths are arranged in parallel in the ink jet head, which hinders the downsizing of the ink jet head. Further, in the conventional inkjet head, when printing as bidirectional printing, the order of the combination of each color may be different between the forward path and the backward path, and it is difficult to improve the quality.

  SUMMARY An advantage of some aspects of the invention is to provide a droplet discharge head and a droplet discharge apparatus that can improve the operation speed and quality and can be downsized. To do.

A droplet discharge head according to the present invention includes a nozzle row including a plurality of nozzle holes, a plurality of discharge chambers communicating with the respective nozzle holes, and a plurality of discharge chambers connected to the discharge chambers and supplying liquid to the discharge chambers. A common droplet chamber; a diaphragm formed on a bottom surface of the discharge chamber; and driving means for displacing the diaphragm to discharge the liquid in the discharge chamber from the nozzle hole. The droplet chambers have a laminated structure formed by stacking, and a plurality of discharge chambers are formed in communication with each common droplet chamber to form a plurality of droplet discharge portions. The chambers are arranged in the nozzle row direction, and the nozzle holes communicating with the respective discharge chambers of the respective droplet discharge portions are arranged in a row.
Thereby, the operation speed and quality of the droplet discharge head are improved, and the droplet discharge head can be downsized. When the droplet discharge head is an ink jet head, since the nozzle row is one when scanning the ink jet head, the color overlap is the same in the forward pass and the return pass, and high print quality is obtained even in bidirectional printing. In addition, landing droplets (ink droplets of different colors) can be stacked with high accuracy.

In the droplet discharge head according to the present invention, the droplet discharge portions are arranged on both sides of the nozzle row to form two rows of discharge chambers facing each other, and the discharge chambers facing the droplet discharge portions are staggered. Is arranged.
Thereby, the common droplet chamber has a stacked structure, and different droplets are supplied to the respective common droplet chambers. With respect to the discharge chambers arranged in one row of the opposite droplet discharge portions, Each droplet can be supplied alternately.

In the droplet discharge head according to the present invention, the common droplet chamber of the droplet discharge portion forms a two-layered structure on each side of the nozzle row.
Thereby, the two common droplet chambers have a stacked structure, and different droplets are supplied to each of them. With respect to the discharge chambers arranged in one row of the two droplet discharge portions facing each other, Each droplet can be supplied alternately.

In the liquid droplet ejection head according to the present invention, the liquid droplet ejection section is disposed on one side of the nozzle row to constitute a row of ejection chambers.
As a result, the common droplet chamber is arranged on one side as a stacked structure, and different droplets are supplied to each of the common droplet chambers. Each droplet can be supplied to the.

In the droplet discharge head according to the present invention, the common droplet chamber of the droplet discharge portion forms a four-layer laminated structure on one side of the nozzle row.
As a result, the four common droplet chambers have a stacked structure, and different droplets are supplied to each of them, and each droplet is alternately supplied to one discharge chamber of the droplet discharge section. be able to.

In the droplet discharge head according to the present invention, different types of liquids are supplied to the common droplet chambers of the respective droplet discharge portions, and the discharge chambers corresponding to the common droplet chambers from the respective common droplet chambers. Are discharged from nozzle holes corresponding to the respective discharge chambers, and different liquid dots are sequentially formed in the nozzle row direction.
As a result, when the droplet discharge device is an inkjet head, the color superposition method is the same in the forward pass and the return pass, and high print quality is obtained even in bidirectional printing. In addition, ink droplets of different colors can be superimposed with high accuracy.

In the droplet discharge head according to the present invention, the first droplet discharge portion and the second droplet discharge portion are arranged on one side of the nozzle row, and the third droplet discharge portion and the fourth droplet discharge portion are arranged. A droplet discharge portion is disposed on the other side of the nozzle row, and these are in the nozzle row direction, the discharge chamber of the first droplet discharge portion, the discharge chamber of the third droplet discharge portion, and the second droplet The discharge chamber of the discharge unit and the discharge chamber of the fourth droplet discharge unit are repeatedly arranged in this order, the first liquid is discharged from the nozzle hole of the discharge chamber of the first droplet discharge unit, and the third liquid is discharged. The third liquid is discharged from the nozzle hole of the discharge chamber of the droplet discharge section, the second liquid is discharged from the nozzle hole of the discharge chamber of the second droplet discharge section, and the fourth droplet discharge section The fourth liquid is discharged from the nozzle holes of the discharge chambers, and the discharge liquid discharged from these nozzle holes is repeated in the order of arrangement of the discharge chambers in the nozzle row direction. And it forms a dot rows.
As a result, when the droplet discharge device is an ink jet head, the above-described nozzle arrangement can be arranged in four color nozzle arrangements, and the colors can be superimposed with high print quality and high accuracy. When speeding up printing with head scanning as bidirectional printing, if the order of superimposing colors differs between the forward path and the backward path, the print quality will be insufficient and the accuracy of color superposition will be reduced. Since the order of superimposing is the same in the forward path and the backward path, the color superposition is the same in the scanning forward path and the backward path, and the above problem does not occur.

In the droplet discharge head according to the present invention, the first droplet discharge portion, the second droplet discharge portion, the third droplet discharge portion, and the fourth droplet discharge portion may be one of the nozzle rows. These are arranged on the side, and these are the discharge chamber of the first droplet discharge portion, the discharge chamber of the second droplet discharge portion, the discharge chamber of the third droplet discharge portion, and the fourth droplet in the nozzle row direction. Repeatedly arranged in the order of the discharge chambers of the discharge unit, the first liquid is discharged from the nozzle holes of the discharge chamber of the first droplet discharge unit, and from the nozzle holes of the discharge chamber of the second droplet discharge unit The second liquid is discharged, the third liquid is discharged from the nozzle hole of the discharge chamber of the third droplet discharge section, and the fourth liquid is discharged from the nozzle hole of the discharge chamber of the fourth droplet discharge section. Is discharged, and the discharge liquid discharged from these nozzle holes forms a dot row in which the discharge chambers are repeated in the arrangement order of the discharge chambers in the nozzle row direction.
As a result, when the droplet discharge head is an inkjet head, the above-described nozzle arrangement can be arranged in four color nozzle arrangements so that colors can be superimposed with high print quality and high accuracy.
When speeding up printing with head scanning as bidirectional printing, if the order of superimposing colors differs between the forward path and the backward path, the print quality will be insufficient and the accuracy of color superposition will be reduced. Since the order of superimposing is the same in the forward path and the backward path, the color superposition is the same in the scanning forward path and the backward path, and the above problem does not occur.

In the droplet discharge head according to the present invention, a diaphragm is provided between the stacked common droplet chambers.
Thereby, pressure interference between the common droplet chambers of the droplet discharge head can be prevented.

The droplet discharge head according to the present invention is a face eject type.
This makes it possible to reduce the thickness of the droplet discharge head.

The droplet discharge head according to the present invention is an edge eject type.
As a result, the planar shape of the nozzle surface of the droplet discharge head can be reduced. Further, the nozzle communication channel is not necessary, and the channel resistance can be reduced.

A droplet discharge device according to the present invention includes a plurality of nozzle rows including a plurality of nozzle holes, a plurality of discharge chambers communicating with the respective nozzle holes, and a plurality of discharge chambers connected to the discharge chambers and supplying liquid to the discharge chambers. A common droplet chamber; a diaphragm formed on a bottom surface of the discharge chamber; and driving means for displacing the diaphragm to discharge the liquid in the discharge chamber from the nozzle hole. The droplet chambers have a laminated structure formed by stacking, and a plurality of discharge chambers are formed in communication with each common droplet chamber to form a plurality of droplet discharge portions. A chamber is arranged in the nozzle row direction, and includes a droplet discharge head in which nozzle holes communicating with the discharge chambers of the droplet discharge portions are arranged in a row.
As a result, the operation speed and quality (printing speed and printing quality) can be improved, and a liquid droplet ejection apparatus including a miniaturized liquid droplet ejection head can be provided.

Embodiment 1 FIG.
1 is an exploded perspective view showing an essential part of an ink jet head according to Embodiment 1 of the present invention, FIG. 2 is an explanatory plan view of the assembled state of the ink jet head shown in FIG. 1, and FIG. It is a longitudinal cross-sectional view of the state cut | disconnected by the line. In addition, the exploded perspective view of FIG. 1 is shown in a state in which the front side and the right side of the drawing are partially omitted.
1 to 3, the inkjet head has a four-layer structure in which four substrates, a nozzle substrate 10, a reservoir substrate 20, a cavity substrate 30, and an electrode substrate 40 are bonded together in this order.
Hereinafter, the configuration of each substrate will be described in detail. In the description, one side of the nozzle row of the inkjet head (the first row A side including the ink pressure chamber located on the back side in FIG. 1 or the right side in FIG. 2) and the other side This will be described separately on the side (the second row B side including the ink pressure chamber located on the near side in FIG. 1 or the left side in FIG. 2).

The nozzle substrate 10 is made of a silicon material. A large number of nozzle holes 11 and 110 are arranged in the nozzle substrate 10 at a predetermined interval (adjacent nozzle holes are the same pitch, hereinafter may be referred to as one pitch) and penetrated perpendicularly to the substrate surface. Yes. Nozzle holes 11 (first nozzle hole 11a, second nozzle hole 11b, third nozzle hole 11c, fourth nozzle hole 11d,... Belonging to the first row portion A side of the nozzle rows arranged in a row. ), And nozzle holes 110 (first nozzle hole 110a, second nozzle hole 110b, third nozzle hole 110c, fourth nozzle hole 110d...) Belonging to the second row portion B side of the nozzle row, Are alternately arranged on a straight line. That is, as a whole, the first nozzle hole 11a, the first nozzle hole 110a, the second nozzle hole 11b, the second nozzle hole 110b, the third nozzle hole 11c, the third nozzle hole 110c, and the fourth The nozzle holes 11d and the fourth nozzle holes 110d are arranged in this order. And the 1st row part A provided with nozzle hole 11 and the 2nd row part B provided with nozzle hole 110 are arranged facing both sides of a nozzle row.
The nozzle substrate 10 includes a first reservoir for preventing pressure interference between discharge chambers (described later) at the upper surface position of a first reservoir (first common ink chamber or common droplet chamber) (described later). A diaphragm 12 and a second diaphragm (not shown) are provided.

  The reservoir substrate 20 is made of a silicon material. On the first row portion A side of the reservoir substrate 20, the reservoir substrate 20 is vertically penetrated, and nozzle holes 11 (first nozzle holes 11 a, second nozzle holes 11 b, and third nozzles) provided in the nozzle substrate 10 are provided. The nozzle communication channel 21 (the first nozzle communication channel 21a, the second nozzle channel 11a, the second nozzle hole 11d,...) Having a slightly larger diameter than the nozzle holes 11 communicating independently with each other. A nozzle communication channel 21b, a third nozzle communication channel 21c, a fourth nozzle communication channel 21d,...) Are provided.

On the second row portion B side of the reservoir substrate 20, the reservoir substrate 20 is vertically penetrated, and the nozzle holes 110 (the first nozzle hole 110 a, the second nozzle hole 110 b, the third nozzle hole 110 provided in the nozzle substrate 10 are provided. The nozzle communication channel 210 (the first nozzle communication channel 210a, the second nozzle communication channel 210a, the second nozzle hole 110d,...) Having a slightly larger diameter than the nozzle holes 110 communicating independently with each other. Nozzle communication channel 210b, third communication channel 210c, fourth communication channel 210d,...) Are provided.
Note that the nozzle communication channels 21 and 210 penetrating the reservoir substrate 20 are provided coaxially with the nozzle holes 11 and 110 of the nozzle substrate 10, respectively, so that straightness is obtained when ink droplets are ejected.

  Further, on the first row portion A side of the reservoir substrate 20, a part of the nozzle communication channel 21 (the first nozzle communication channel 21a, the third nozzle communication channel 21c. ..) Through a part of the discharge recesses 31 (the first discharge recesses 31a, the third discharge recesses 31c,... Arranged alternately) that become the discharge chambers 2 provided in the cavity substrate 30. A first reservoir recess 22 is formed which serves as a first reservoir (first common ink chamber) 3 communicating with each other.

On the bottom wall of the first reservoir recess 22 that becomes the first reservoir 3, ink is applied to a part of the discharge chamber 2 (the first discharge recess 31 a that becomes the discharge chamber 2, the third discharge recess 31 c...). Supply port 5 (supply port 5a...) And a supply hole that is a part of the first ink supply hole 6 for supplying ink from the outside to the first reservoir 3 are penetrated. ing.
Note that, on the lower surface of the first reservoir concave portion 22 of the reservoir substrate 20, a concave surface 23 a that forms a diaphragm 23 is provided in which the joint surface side with the cavity substrate 30 is formed in a concave shape in cross section.

  Further, on the second row portion B side of the reservoir substrate 20, similarly to the first row portion A side, a part of the nozzle communication flow path 210 (first nozzle communication flow paths arranged every other one). 210a, the third nozzle communication flow path 210c... Are part of the discharge recesses 310 that become the discharge chambers 200 provided in the cavity substrate 30 (the first discharge recesses 310a, the second discharge recesses 310a, the second discharge recesses 310a, and the like). 3, the first reservoir recess 220 serving as the first reservoir (first common ink chamber) 300 is formed.

On the bottom wall of the first reservoir recess 220 serving as the first reservoir 300, ink is applied to a part of the discharge chamber 200 (the first discharge recess 310a, the third discharge recess 310c... Serving as the discharge chamber 200). A supply hole which is a part of the first ink supply hole 60 for supplying the ink is penetrated.
Note that the lower surface of the first reservoir recess 220 of the reservoir substrate 20 is formed with a concave cross section on the joint surface side with the cavity substrate 30 in the same manner as the first row A side, and the recess (FIG. Not shown).
An ink protective film made of, for example, a thermal oxide film (SiO ₂ film) is formed on the entire surface of the reservoir substrate 20 in order to prevent silicon corrosion due to ink (not shown).

  The cavity substrate 30 is made of a silicon material. On the first row portion A side of the cavity substrate 30, the nozzle communication channel 21 (first nozzle communication channel 21a, second nozzle communication channel 21b, third nozzle communication channel 21c of the reservoir substrate 20 is provided. , The fourth communication flow path 21d, and the discharge chamber 2 (the first discharge chamber 2a, the second discharge chamber 2b, the third discharge chamber 2c, and the fourth discharge chamber) that communicate with each other independently. 2d..., Which is a discharge recess 31 (first discharge recess 31a, second discharge recess 31b, third discharge recess 31c, fourth discharge recess 31d...).

  The diaphragm 7 is provided on the bottom wall of the discharge recess 31 and is constituted by a boron diffusion layer formed by diffusing high-concentration boron into silicon. Since the diaphragm 7 is made of a boron diffusion layer, the etching stop in the wet etching can be sufficiently performed, so that the thickness and surface roughness of the diaphragm 7 can be adjusted with high accuracy.

A part of the discharge recesses 31 (second discharge recesses 31b, fourth discharge recesses 31d, etc. arranged every other one) is connected to the second reservoir (the second reservoir) via the supply port 32. The second reservoir recess 33 is formed to be the second common ink chamber or the common droplet chamber 4).
A supply hole that is a part of the second ink supply hole 34 for supplying ink from the outside to the second reservoir recess 33 is passed through the bottom wall of the second reservoir recess 33.

  Further, the first discharge recesses 31a are disposed alternately with respect to the other portions of the discharge recesses 31 on the first row A side (second discharge recesses 31b, fourth discharge recesses 31c,... , And the third discharge recess 31d... Communicate with the first reservoir recess 22 provided in the previous reservoir substrate 20 via the supply ports 5 (5a, 5c...).

On the side of the second row B of the cavity substrate 30, the nozzle communication channel 210 (first communication channel 210a, second communication channel 210b, third communication channel 210c, fourth channel of the reservoir substrate 20 is provided. Of the communication flow paths 210d... Independently communicated with each other (first discharge chamber 200a, second discharge chamber 200b, third discharge chamber 200c, fourth discharge chamber 200d,...). The discharge recess 310 (first discharge recess 310a, second discharge recess 310b, third discharge recess 310c, fourth discharge recess 310d,...) Is provided.
A diaphragm 70 is provided on the bottom wall of the discharge recess 310, and is constituted by a boron diffusion layer formed by diffusing high-concentration boron into silicon.

A part of the discharge recesses 310 (the second discharge recesses 310b, the fourth discharge recesses 310d, etc. arranged every other one) is connected to the second reservoir (the first reservoir) via the supply port 320. A second reservoir recess 330 is formed which becomes the second common ink chamber or common droplet chamber 400).
A supply hole that is a part of the second ink supply hole 340 for supplying ink from the outside to the second reservoir recess 330 is passed through the bottom wall of the second reservoir recess 330.

  Other portions of the discharge recesses 310 (the first discharge recesses 310a, the third discharge recesses 310d, etc. arranged alternately with respect to the second discharge recesses 310b, the fourth discharge recesses 310d,...). ) Communicates with the first reservoir recess 200 provided in the reservoir substrate 20 via the supply ports 50 (50a, 50c...).

On the lower surface of the cavity substrate 30, for example, an insulating film made of SiO ₂ film is formed by plasma CVD (Chemical Vapor Deposition) using TEOS (Tetraethylorthosilicate Tetraethoxysilane) as a raw material. (Not shown). This insulating film is provided in order to prevent dielectric breakdown and short circuit when the ink jet head is driven. On the other hand, an ink protective film (not shown) similar to the reservoir substrate 20 is formed on the upper surface of the cavity substrate 30.
The cavity substrate 30 is provided with a supply hole that becomes a part of the first ink supply hole 6 that supplies ink to the first reservoir 3 on the first row portion A side, and on the second row portion B side. A supply hole that is a part of the first ink supply hole 60 that supplies ink to the first reservoir 300 is provided.

The aforementioned recess 23 a formed in the lower portion of the first reservoir recess 22 on the first row A side of the reservoir substrate 20 is located on the opening side of the second reservoir recess 33 of the cavity substrate 30, and is ejected. A second diaphragm 23 for preventing pressure interference between the chambers is formed.
The aforementioned recess (not shown) formed in the lower portion of the first reservoir recess 220 on the second row B side of the reservoir substrate 20 is located on the opening side of the second reservoir recess 330 of the cavity substrate 30. It forms a second diaphragm (not shown) for preventing pressure interference between the discharge chambers. The thickness of these diaphragms 23 and the like can be adjusted by dry etching from the back surface of the reservoir substrate 20.

  The electrode substrate 40 is made of a glass material. Among them, it is suitable to use a borosilicate heat-resistant hard glass having a thermal expansion coefficient close to that of the silicon material of the cavity substrate 30. By using borosilicate heat-resistant hard glass, the stress generated between the electrode substrate 40 and the cavity substrate 30 is reduced when the electrode substrate 40 and the cavity substrate 30 are anodically bonded because the thermal expansion coefficients of both substrates are close. As a result, the electrode substrate 40 and the cavity substrate 30 can be firmly bonded without causing problems such as peeling.

On the first row portion A side of the electrode substrate 40, electrode concave portions 41 are respectively provided at positions on the surface of the cavity substrate 30 facing the diaphragm 7, and on the second row portion B side of the electrode substrate 40, Electrode recesses 410 are respectively provided at positions on the surface of the cavity substrate 30 facing the vibration plate 70, and these are formed by etching.
On the bottom surface of the electrode recess 41 (41a, 41b ...) on the first row A side and the bottom surface of the electrode recess 410 (410a, 410b ...) on the second row B, ITO ( The individual electrodes 8 (8a, 8b...) And the individual electrodes 80 (80a, 80b...) Made of Indium Tin Oxide are formed by sputtering. Therefore, the air gap G (gap) formed between the diaphragm 7 and the individual electrode 8 on the first row A side and the diaphragm 70 and the individual electrode 80 on the second row B side is the first. The depth of the electrode recess 41 on the column A side and the thickness of the individual electrode 8, and the depth of the electrode recess 410 on the second column B side and the thickness of the individual electrode 80 are determined. The air gap G greatly affects the ejection characteristics of the inkjet head 1. The open end of the air gap G is hermetically sealed with a sealing material (not shown) made of an epoxy adhesive or the like.

The terminal portion 85 of the individual electrode 8 on the first row portion A side is exposed to the electrode extraction portion 9 side where the end portions of the reservoir substrate 20 and the cavity substrate 30 are opened. A flexible wiring board (not shown) on which a drive control circuit such as an IC is mounted is connected to the terminal portion 85 of each individual electrode 8 and the common electrode 35 provided at the end of the cavity substrate 30.
The terminal portions (not shown) of the individual electrodes 80 on the second row portion B side are exposed to the electrode extraction portion (not shown) side where the end portions of the reservoir substrate 20 and the cavity substrate 30 are opened, In the electrode extraction portion, for example, a flexible wiring board (not shown) on which a drive control circuit such as a driver IC is mounted is provided at a terminal portion (not shown) of each individual electrode 80 and an end portion of the cavity substrate 30. And a common electrode (not shown).
Further, the electrode substrate 40 is provided with holes that constitute part of the ink supply holes 6 and 34 connected to an ink cartridge (not shown).

Next, the operation of the inkjet head 1 configured as described above will be described with reference to FIGS. A first droplet discharge portion w is formed on the first row portion A side of the inkjet head 1, and ink (for example, yellow-Y) in an external ink cartridge passes through the first ink supply hole 6. Supplied into the first reservoir 3, the discharge chamber 2 (first discharge chamber 2 a, third discharge chamber 2 c...), Nozzle communication flow from the individual supply ports 5 (5 a, 5 c...) The tip of the nozzle hole 11 (the first nozzle hole 11a, the third nozzle hole 11c...) Through the passage 21 (the first nozzle communication flow path 21a, the third nozzle communication flow path 21c...). Has been met.
In addition, a second droplet discharge portion x is formed on the first row portion A side, and ink (for example, black K) in another external ink cartridge passes through the second ink supply hole 34 to form the second droplet discharge portion x. 2 are supplied into the reservoir 4 and from the individual supply ports 32 (32b, 32d...), The respective discharge chambers 2 (second discharge chamber 2b, fourth discharge chamber 2d...), Nozzle communication. The nozzle hole 11 (second nozzle hole 11b, fourth nozzle hole 11d...) Passes through the flow path 21 (second nozzle communication flow path 21b, fourth nozzle communication flow path 21d...). Filled up to the tip.

Further, a third droplet discharge portion y is formed on the second row portion B side, and ink (for example, cyan C) in another external ink cartridge passes through the first ink supply hole 60 to form the first ink. Are supplied into one reservoir 300, and are connected to respective discharge chambers 200 (first discharge chamber 200a, third discharge chamber 200c...) And nozzle communication from individual supply ports 50 (50a, 50c...). The nozzle hole 110 (the first nozzle hole 110a, the third nozzle hole 110c...) Passes through the flow path 210 (the first nozzle communication flow path 210a, the third nozzle communication flow path 210c...). Filled up to the tip.
In addition, a fourth droplet discharge portion z is formed on the second row portion B side, and the ink (for example, magenta M) in another external ink cartridge passes through the second ink supply hole 340 to form the second droplet discharge portion z. 2 are supplied into the reservoir 400, and from the individual supply ports 320 (320b, 320d...), The respective discharge chambers 200 (second discharge chamber 200b, fourth discharge chamber 200d...), Nozzle communication. The nozzle hole 110 (the second nozzle hole 110b, the fourth nozzle hole 110d,...) Passes through the flow path 210 (the second nozzle communication path 210b, the fourth nozzle communication path 210d,...). Filled up to the tip.

  When a drive signal (pulse voltage) is supplied to the individual electrode 8 on the first column A side and the individual electrode 80 on the second column B side by the drive control circuit with the ink filled as described above. A pulse voltage is applied to the individual electrodes 8 and 80 from the drive control circuit to charge the individual electrodes 8 and 80 positively, while the corresponding diaphragms 7 and 70 are negatively charged. At this time, since electrostatic force (Coulomb force) is generated between the individual electrodes 8 and 80 and the diaphragms 7 and 70, the diaphragms 7 and 70 are attracted toward the individual electrodes 8 and 80 and bent by the electrostatic force. . As a result, the volume of the discharge chambers 2 and 200 increases. Next, when the pulse voltage is turned off, the electrostatic force disappears, and the diaphragms 7 and 70 return to their original state due to the elastic force. At this time, the volume of the discharge chambers 2 and 200 is rapidly reduced. Part of the ink in the discharge chambers 2 and 200 is discharged from the nozzle holes 11 and 110 by the pressure.

Thus, the ink (yellow Y) in the discharge chamber 2 (the first discharge chamber 2a, the third discharge chamber 2c,...) Of the first droplet discharge portion w on the first row portion A side is the nozzle. The nozzle hole 11 (first nozzle hole 11a, third nozzle) passes through the communication channel 21 (first nozzle communication channel 21a, third nozzle communication channel 21c...) And becomes ink droplets. It is discharged from the holes 11c.
The ink (black K) in the discharge chamber 2 (second discharge chamber 2b, fourth discharge chamber 2d,...) Of the second droplet discharge section x on the first row portion A side is a nozzle. It passes through the communication channel 21 (second nozzle communication channel 21b, fourth nozzle communication channel 21d...) And becomes ink droplets to form nozzle holes 11 (second nozzle holes 11b, fourth nozzles). It is discharged from the holes 11d.

Further, the ink (cyan C) in the discharge chamber 200 (first discharge chamber 200a, third discharge chamber 200c...) Of the third droplet discharge portion y on the second row portion B side is a nozzle. The nozzle hole 110 (first nozzle hole 110a, third nozzle) passes through the communication channel 210 (first nozzle communication channel 210a, third nozzle communication channel 210c...) And becomes ink droplets. Are discharged from the holes 110c.
Further, the ink (magenta M) in the discharge chamber 200 (second discharge chamber 200b, fourth discharge chamber 200d...) Of the fourth droplet discharge portion z on the second row portion B side is a nozzle. The nozzle hole 110 (second nozzle hole 110b, fourth nozzle) passes through the communication channel 210 (second nozzle communication channel 210b, fourth nozzle communication channel 210d...) And becomes ink droplets. Are discharged from the holes 110d.

Then, the pulse voltage is applied again, and the diaphragm 7 on the first row portion A side bends toward the individual electrode 8 side, so that the ink (yellow Y) of the first droplet discharge portion w becomes the first From the reservoir 3 through the supply port 5 (5a, 5c...), The discharge chamber 2 (first discharge chamber 2a, third discharge chamber 2c...) Is replenished. Further, the ink (black K) of the second droplet discharge section x passes through the supply port 32 (32b, 32d,...) From the second reservoir 4 to the discharge chamber 2 (second discharge chamber 2b, The fourth discharge chamber 2d ...) is replenished.
Further, the diaphragm 70 on the second row B side bends to the individual electrode 80 side, so that the ink (cyan C) of the third droplet discharge portion y is supplied from the first reservoir 300 to the supply port 50 ( 50a, 50c...) Is supplied into the discharge chamber 200 (first discharge chamber 200a, third discharge chamber 200c...). Further, the ink (magenta M) in the fourth droplet discharge section z passes through the supply port 320 (320b, 320d,...) From the second reservoir 400, and then the discharge chamber 200 (second discharge chamber 200b, The fourth discharge chamber 200d ...) is replenished.

Thus, as shown in FIG. 4, from the nozzle holes 11 (first nozzle hole 11a, third nozzle hole 11c...) Of the first droplet discharge portion w on the first row portion A side, Yellow Y1, Y3,... Are ejected, and black K2, K4,... Are ejected from the nozzle holes 11 (second nozzle hole 11b, fourth nozzle hole 11d,...) Of the second droplet discharge section x. Are ejected to form dot rows (Y1, K2, Y3, K4...) Having different colors alternately in the row line direction on the paper surface.
Further, cyan C1, C3,... Are generated from the nozzle holes 110 (first nozzle hole 110a, third nozzle hole 110c,...) Of the third droplet discharge unit y on the second row B side. Magenta M2, M4,... Are ejected from the nozzle holes 110 (second nozzle hole 110b, fourth nozzle hole 110d,...) Of the fourth droplet discharge section z, and are ejected onto the paper surface. Are formed with dot rows (C1, M2, C3, M4...) Of different colors alternately in the column line direction.

  In the above case, the nozzle holes 11 on the first row portion A side and the nozzle holes 110 on the second row portion B side are respectively provided in the row direction at intervals of 2 pitches in the row direction. The dots Y1, K2, Y3, K4... Of the first row A side dot row and the C1, M2, C3, M4. The dots are formed in a state shifted by 1 pitch in the row direction.

  More specifically with reference to FIG. 5, the left side of the figure is a dot row on the second row B side, and the dots of cyan C1, magenta K2, cyan C3, magenta K4... Are shifted by 2 pitches in the row direction. Overlapping alternately. The right side of the figure is a dot row on the first row portion A side where the nozzle position is shifted by one pitch in the row direction with respect to the second row portion B side, and yellow Y1, black K2, yellow Y3. The dots overlap in a state where they are alternately shifted by 2 pitches in the row direction. The size of the dots in each of the row portions A and B is such that the distance to the dot centers of other colors adjacent in the row direction becomes a circle radius (a state shifted by 2 pitches).

  And the column line on the first column part A side and the column line on the second column part B side are described in parallel independently as two column lines in FIG. Actually, the nozzle holes 11 on the first row portion A side and the nozzle holes 110 on the second row portion B side are arranged in a line as shown in FIG. 6, that is, on the same straight line. These column lines shown in FIG. 5 are the same column lines that overlap as shown in FIG. Therefore, as shown in FIG. 6, the dot rows on the first row portion A side and the second row portion B side are located on the same straight line, and yellow Y1, cyan C1, black K2, magenta M2, yellow Like Y3, cyan C3, black K4,..., They are arranged on the same straight line at intervals of one pitch. In this way, four colors of nozzles are arranged on the same straight line, and a full color is realized.

As described above, the four nozzle color schemes are alternately formed on the line of the paper. The above color schemes are in the direction in which the head moves (the horizontal direction in FIG. 2 and the horizontal direction in FIG. 6). This is one scene, and the head moves in the left-right direction in FIG. 2 (FIG. 6) while forming the dot row as shown above (as in FIG. 6).
After moving in one direction of FIG. 6 (for example, the right side of the figure), the direction is changed at the end and moved in the opposite direction (left side of FIG. 6).
At this time, the paper surface moves in a direction perpendicular to the moving direction of the head.

According to the first embodiment, as shown in FIG. 2, two rows of discharge chambers (the discharge chamber 2 on the first row portion A side and the discharge chamber 200 on the second row portion B side) facing each other are staggered. Since the nozzles 11 and 100 arranged and communicating with the respective discharge chambers 2 and 200 are arranged in a line, as shown in FIG. 6, full color expression (three-color composite + black) can be performed by one scan. . When head scanning is performed as bidirectional printing, as shown in FIG. 6, the superposition of each color does not differ between the forward path and the backward path of scanning, and the order of superposition of each color is always constant. In this way, with the four-color nozzle arrangement, even with bidirectional printing, high print quality can be achieved, colors (landing droplets) can be superimposed with high accuracy, print quality can be improved, and high image quality can be achieved. It becomes possible to reduce the size of the inkjet head.
In addition, since the diaphragms 12 and 23 are provided in contact with the two reservoirs 3 and 4, pressure interference between the discharge chambers 2 can be prevented.
Further, since the above structure is adopted in the face eject type ink jet head, the ink jet head can be made thin.

Embodiment 2. FIG.
FIG. 7 is an explanatory plan view of an ink jet head according to Embodiment 2 of the present invention, and FIG. 8 is a longitudinal sectional view of FIG. 7 cut along a roll line.
In Embodiment 1, two rows of discharge chambers facing each other are arranged in a staggered manner, nozzles communicating with the respective discharge chambers are arranged in one row, and two common ink chambers belonging to each row side are arranged in a stacked structure. In the second embodiment, the droplet discharge chambers are arranged in one row, and the nozzles communicating with the respective discharge chambers are arranged in one row. This is a one-row, four-color, single-row structure in which four common ink chambers are arranged as a laminated structure. In this ink jet head, the four substrates of the nozzle substrate 10, the third reservoir substrate 20a, the second reservoir substrate 20b, the first reservoir substrate 20c, the cavity substrate 30 and the electrode substrate 40 are bonded together in this order. It has a 6-layer structure.
Hereinafter, the configuration of each substrate will be described in detail.

  The nozzle substrate 10 is made of a silicon material. The nozzle substrate 10 has a number of nozzle holes 11 (first nozzle holes 11a, second nozzle holes 11b, third nozzle holes 11c, fourth nozzle holes 11d, fifth nozzle holes 11e, sixth nozzles). The holes 11f, the seventh nozzle holes 11g, the eighth nozzle holes 11h,...) Are arranged in a line at the same pitch and penetrated perpendicularly to the substrate surface.

The reservoir substrate 20 is made of a silicon material. In the second embodiment, the reservoir substrate 20 is formed by stacking three substrates, and the third reservoir substrate 20a, the second reservoir substrate 20b, and the first reservoir substrate 20c are stacked in this order from the nozzle substrate 10 side. It is.
The first, second, and third reservoir substrates 20c, 20b, and 20a are vertically penetrated through the nozzle holes 11 (the first nozzle hole 11a, the second nozzle hole 11b, The nozzle communication channel 21 (the first communication channel 21a, the second communication channel 21a, the second communication channel 21a, the second nozzle hole 11d,...) Has a slightly larger diameter than the nozzle holes 11 that communicate with each other independently. A communication channel 21b, a third communication channel 21c, a fourth communication channel 21d,...) Are provided.

  In the first reservoir substrate 20c, a part of the nozzle communication channel 21 (second nozzle communication channel 21b, and sixth communication channels 21f arranged sequentially every three from the second nozzle communication channel 21b), A second reservoir (second common ink) communicating with each other via the discharge chambers 2 (second discharge chambers 2b, sixth discharge chambers 2f,... Arranged every third) provided on the cavity substrate 30. Chamber) 3c is formed. A supply port 5 (5b, 5b) for supplying ink to a part of the discharge chamber 2 (second discharge chamber 2b, sixth discharge chamber 2f,...) Is formed on the bottom wall of the second reservoir 3c. 5f...) And a supply hole that is a part of the second ink supply port 6c for supplying ink from the outside to the first reservoir 3c are penetrated.

  In the second reservoir substrate 20b, a part of the nozzle communication channel 21 (fourth communication channel 21d, and eighth communication channels 21h arranged in order from every third channel) is cavityd. A central reservoir (central common ink chamber) 3b communicated via the ejection chambers 2 (fourth ejection chambers 2d, eighth ejection chambers 2h,... Arranged every third) provided on the substrate 30. Is formed. A supply port 5 (5d, 5d) for supplying ink to a part of the discharge chamber 2 (fourth discharge chamber 2d, eighth discharge chamber 2h,...) Is formed in the bottom wall of the second reservoir 2. 5h...) And a supply hole that is a part of the central ink supply port 6b for supplying ink to the central reservoir 3b from the outside is penetrated.

  In the third reservoir substrate 20a, a part of the nozzle communication channel 21 (the first nozzle communication channel 21a, and the fifth nozzle communication channel 21e.. And an upper reservoir (upper common ink chamber) communicating with each other through the discharge chambers 2 (the first discharge chamber 2a, the fifth discharge chamber 2e,... Arranged every third) provided on the cavity substrate 30. 3a is formed. Further, on the bottom wall of the upper reservoir 3a, supply ports 5a, 5e,... For supplying ink to a part of the discharge chamber 2 (first discharge chamber 2a, fifth discharge chamber 2e,...). And a supply hole that is a part of the upper ink supply port 6a for supplying ink from the outside to the upper reservoir 3a.

The cavity substrate 30 is made of a silicon material. The cavity substrate 30 includes a discharge chamber (ink pressure chamber) 2 (first discharge chamber 2 a, second discharge chamber 2 b, third discharge) that communicates independently with each of the nozzle communication channels 21 of the reservoir substrate 20. Chamber 2c, fourth discharge chamber 2d...).
A diaphragm 7 is provided on the bottom wall of the discharge chamber 2 and is constituted by a boron diffusion layer formed by diffusing high-concentration boron into silicon.

A part of the discharge chamber 2 (the third discharge chamber 2c arranged every other chamber, the seventh discharge chamber 2g...) Is supplied through the supply port 32 (32c, 32g...). A first reservoir (first common ink chamber or common droplet chamber) 4 that communicates is formed.
The bottom wall of the first reservoir 4 passes through a supply hole that is a part of the first ink supply port 34 for supplying ink to the first reservoir 4 from the outside.

On the lower surface of the cavity substrate 30, for example, an insulating film made of SiO ₂ film is formed by plasma CVD (Chemical Vapor Deposition) using TEOS (Tetraethylorthosilicate Tetraethoxysilane) as a raw material. (Not shown). On the other hand, an ink protective film (not shown) similar to the reservoir substrate 20 is formed on the upper surface of the cavity substrate 30.

The electrode substrate 40 is made of a glass material.
The electrode substrate 40 is provided with an electrode recess 41 at a position on the surface of the cavity substrate 30 facing the diaphragm 7. Generally, an ITO (Indium Tin Oxide) is formed on the bottom surface of each electrode recess 41. The individual electrode 8 made of is formed by sputtering.
The terminal portion 85 of the individual electrode 8 is exposed to the electrode extraction portion 9 side where the end portions of the reservoir substrate 20 and the cavity substrate 30 are opened, and a drive control circuit such as a driver IC is mounted on the electrode extraction portion 9. The formed flexible wiring board (not shown) is connected to the terminal portion 85 of each individual electrode 8 and the common electrode 35 provided at the end of the cavity substrate 30.
In addition, the electrode substrate 40 passes through supply holes that are part of the ink supply ports 34, 6c, 6b, 6a connected to the respective ink cartridges (not shown).

  The operation of the ink jet head configured as described above will be described with reference to FIGS. The ink jet head 1 is formed with a first droplet discharge portion s, and ink (for example, yellow-Y) in an external ink cartridge is supplied into the upper reservoir 3a through the upper ink supply hole 6a. From the supply port 5 (5a, 5e...), The discharge chamber 2 (first discharge chamber 2a, fifth discharge chamber 2e...), The nozzle communication channel 21 (first communication channel 21a, first) 5, and the tip of the nozzle hole 11 (first nozzle hole 11a, fifth nozzle hole 11e...) Is filled.

  In addition, the second droplet discharge portion t is formed, and the ink (for example, cyan C) in another external ink cartridge is supplied into the first reservoir 3c through the first ink supply hole 6c, and is individually supplied. From the supply ports 5 (5b, 5f...), The respective discharge chambers 2 (second discharge chamber 2b, sixth discharge chamber 2f...), Nozzle communication channel 21 (second nozzle communication flow) The nozzles 11 (second nozzle holes 11b, sixth nozzle holes 11f,...) Are filled up through the passages 21b, the sixth nozzle communication channels 21f,.

  Further, the third droplet discharge unit u is formed, and the ink (for example, black K) in another external ink cartridge is supplied into the second reservoir 4 through the second ink supply hole 34 and supplied. From the ports 32 (32c, 32g...), The respective discharge chambers 2 (third discharge chamber 2c, seventh discharge chamber 2g...), Nozzle communication channel 21 (third nozzle communication channel 21c). , The nozzle nozzle 11 (third nozzle hole 11c, seventh nozzle hole 11g...) Is filled through the seventh nozzle communication channel 21g.

  In addition, a fourth droplet discharge portion v is formed, and ink (for example, magenta M) in another external ink cartridge is supplied into the central reservoir 3b through the central ink supply hole 6b, and the supply port 5 (5d). 5h..., From each discharge chamber 2 (fourth discharge chamber 2d, eighth discharge chamber 2h...), Nozzle communication channel 21 (fourth communication channel 21d, eighth nozzle). It is filled up to the tip of the nozzle hole 11 (the fourth nozzle hole 11d, the eighth nozzle hole 11h...) Through the communication flow path 21h.

Thus, the ink (yellow Y) in the discharge chamber 2 (first discharge chamber 2a, fifth discharge chamber 2e...) Of the first droplet discharge section s is transferred to the nozzle communication channel 21 (first Passes through the nozzle communication flow path 21a, the fifth nozzle communication flow path 21e,..., And is ejected from the nozzle holes 11 (the first nozzle holes 11a, the fifth nozzle holes 11e,...) As ink droplets. Is done.
Further, the ink (cyan C) in the discharge chamber 2 (second discharge chamber 2b, sixth discharge chamber 2f...) Of the second droplet discharge section t is transferred to the nozzle communication channel 21 (second discharge chamber 2). Passes through the communication channel 21b, the sixth communication channel 21f,..., And is ejected from the nozzle holes 11 (second nozzle hole 11b, sixth nozzle hole 11f,...) As ink droplets. .

Further, the ink (black K) in the discharge chamber 2 (third discharge chamber 2c, seventh discharge chamber 2g...) Of the third droplet discharge section u is transferred to the nozzle communication channel 21 (third Passes through the nozzle communication channel 21c, the seventh nozzle communication channel 21g..., And is ejected from the nozzle holes 11 (third nozzle hole 11c, seventh nozzle hole 11g...) As ink droplets. Is done.
Further, the ink (magenta M) in the discharge chamber 2 (fourth discharge chamber 2d, eighth discharge chamber 2h,...) Of the fourth droplet discharge section v is transferred to the nozzle communication flow path 21 (fourth flow path). Passes through the nozzle communication channel 21c, the eighth nozzle communication channel 21h, etc., and is discharged as ink droplets from the nozzle holes 11 (fourth nozzle hole 11c, eighth nozzle hole 11h,...). Is done.

  According to the second embodiment, as shown in FIGS. 7 and 8, the discharge chambers 2 are arranged in a row, and the nozzles 11 communicating with the respective discharge chambers 2 are arranged in a row, and four common ink chambers 4 are arranged. Since a single-row structure of 4 colors in 1 row in which 3c, 3b, and 3a are arranged as a stacked structure, full color expression (3-color composite + black) is possible in one scan. When the head scanning is performed as bi-directional printing, the nozzles 11 are arranged in a line, so that the superposition of each color does not differ between the forward and backward scans, and the superposition order of each color is always constant. In this way, with the four-color nozzle arrangement, even with bidirectional printing, high print quality can be achieved, colors (landing droplets) can be superimposed with high accuracy, print quality can be improved, and high image quality can be achieved. The inkjet head can be reduced in size.

In the above description, the face eject type ink jet head has been described. However, the present invention can also be applied to an edge eject type ink jet head.
According to the edge eject type inkjet head, the planar shape of the nozzle substrate 10 can be reduced. Further, since the nozzle communication flow path 21 which is indispensable in the face eject type is not necessary, the flow path resistance can be reduced.

Embodiment 3 FIG.
FIG. 9 is a perspective view of the ink jet printer according to Embodiment 3, and FIG. 10 is a perspective view of the main part of FIG.
9 and 10, the ink jet printer 150 is mainly configured by a drum 151 on which a print paper 160 that is a printing object is supported, and an ink jet head 152 that performs recording by discharging ink onto the print paper 160. .
There is an ink supply means (not shown) for supplying ink to the inkjet head 152. The print paper 160 is held by being pressed against the drum 151 by a paper press roller 153 provided parallel to the axial direction of the drum 151. A feed screw 154 is provided in parallel with the axial direction of the drum 151, and the inkjet head 152 is held. The inkjet head 152 is moved in the axial direction of the drum 151 by the rotation of the feed screw 154.

  On the other hand, the drum 151 is rotationally driven by a motor 156 via a belt 155 or the like. Further, the print control unit 157 drives the feed screw 154 and the motor 156 based on the print data and the control signal, and although not shown here, drives the oscillation drive circuit to vibrate the diaphragm 7, Printing is performed on the printing paper 160 while controlling.

In the above description, liquid is ejected as ink onto the print paper 160, but the liquid ejected from the droplet ejection head is not limited to the above-described ink.
For example, in an application to be discharged onto a substrate to be a color filter, a light emitting element is used in an application to be discharged onto a substrate of a display panel (OLED or the like) using an electroluminescent element such as a liquid containing a color filter pigment or an organic compound. For example, a liquid containing a compound and a liquid containing a conductive metal may be discharged from a droplet discharge head provided in each device.

  In addition, when the droplet discharge head is used as a dispenser and used for discharging onto a substrate that is a microarray of biomolecules, DNA (Deoxyribo Nucleic Acids: deoxyribonucleic acid), other nucleic acids (for example, Ribo Nucleic Acid: ribonucleic acid, Peptide Nucleic Acids: peptide nucleic acids, etc.), and liquids containing probes such as proteins may be discharged. In addition, it can also be used for discharging dyes such as cloth.

FIG. 2 is an exploded perspective view showing the main part of the inkjet head according to Embodiment 1 of the invention. FIG. 2 is an explanatory plan view of an assembled state of the ink jet head shown in FIG. 1. The longitudinal cross-sectional view which cut | disconnected FIG. 2 by the II line. FIG. 3 is an explanatory diagram showing an array of ink dots ejected from an inkjet head. FIG. 3 is an explanatory diagram illustrating a state of ink dots ejected from an inkjet head. FIG. 3 is an explanatory diagram illustrating a state of ink dots ejected from the inkjet head according to the first embodiment. Plane explanatory drawing of the inkjet head which concerns on Embodiment 2 of this invention. The longitudinal cross-sectional view which cut | disconnected FIG. 7 by the roll line. FIG. 6 is a perspective view of an ink jet printer according to Embodiment 3 of the present invention. The perspective view of the principal part of FIG.

Explanation of symbols

2,200 Discharge chamber, 3, 3a, 3b, 3c, 4, 300, 400 Reservoir (common droplet chamber), 7,70 Vibration plate, 8, 80 Individual electrode, 10 Nozzle substrate, 11, 110 Nozzle hole, 12 , 23 Diaphragm, 20, 20a, 20b, 20c Reservoir substrate, 30 Cavity substrate, 40 Electrode substrate, A 1st row portion, B 2nd row portion, s, t, u, v, w, x, y, z Droplet discharge unit.

Claims (12)

A nozzle row composed of a plurality of nozzle holes, a plurality of discharge chambers communicating with the respective nozzle holes, a plurality of common droplet chambers communicating with each of the discharge chambers and supplying a liquid to the discharge chambers, A vibration plate formed on the bottom surface, and driving means for displacing the vibration plate to discharge the liquid in the discharge chamber from the nozzle hole,
The plurality of common droplet chambers has a stacked structure formed by stacking,
A plurality of discharge chambers communicate with each common droplet chamber to form a plurality of droplet discharge portions,
A droplet discharge device characterized in that discharge chambers of the droplet discharge portions are arranged in the nozzle row direction, and nozzle holes communicating with the discharge chambers of the droplet discharge portions are arranged in a line. head.   The droplet discharge units are arranged on both sides of a nozzle row to form two rows of discharge chambers facing each other, and the discharge chambers facing the droplet discharge units are arranged in a staggered manner. 1. A droplet discharge head according to 1.   3. The droplet discharge head according to claim 2, wherein the common droplet chamber of the droplet discharge section forms a two-layered structure on each side of the nozzle row.   The droplet discharge head according to claim 1, wherein the droplet discharge unit is disposed on one side of the nozzle row to constitute a row of discharge chambers.   5. The droplet discharge head according to claim 4, wherein the common droplet chamber of the droplet discharge portion forms a four-layer stacked structure on one side of the nozzle row.   Different types of liquids are supplied to the common droplet chambers of the respective droplet discharge units, supplied from the respective common droplet chambers to the discharge chambers corresponding to the common droplet chambers, and from the nozzle holes of the respective discharge chambers. The liquid droplet ejection head according to claim 1, wherein different liquid dots are ejected and formed repeatedly in a predetermined order in the nozzle row direction.   The first droplet discharge portion and the second droplet discharge portion are arranged on one side of the nozzle row, and the third droplet discharge portion and the fourth droplet discharge portion are on the other side of the nozzle row. These are arranged in the nozzle row direction, the discharge chamber of the first droplet discharge unit, the discharge chamber of the third droplet discharge unit, the discharge chamber of the second droplet discharge unit, the fourth droplet discharge in the nozzle row direction The first liquid is discharged from the nozzle hole of the discharge chamber of the first droplet discharge unit, and the nozzle hole of the discharge chamber of the third droplet discharge unit is discharged from the nozzle hole of the third droplet discharge unit. 3 liquid is discharged, the second liquid is discharged from the nozzle hole of the discharge chamber of the second droplet discharge portion, and the fourth liquid is discharged from the nozzle hole of the discharge chamber of the fourth droplet discharge portion. The ejected liquid ejected from these nozzle holes forms a dot row that is repeated in the nozzle row direction in the arrangement order of the ejection chambers. Droplet discharge head according to any one of claims 1, 2 and 3 that.   The first droplet discharge unit, the second droplet discharge unit, the third droplet discharge unit, and the fourth droplet discharge unit are arranged on one side of the nozzle row, and these are arranged in the nozzle row direction. The discharge chamber of the first droplet discharge section, the discharge chamber of the second droplet discharge section, the discharge chamber of the third droplet discharge section, and the discharge chamber of the fourth droplet discharge section are repeatedly arranged in this order. The first liquid is discharged from the nozzle hole of the discharge chamber of the first droplet discharge unit, the second liquid is discharged from the nozzle hole of the discharge chamber of the second droplet discharge unit, and the third liquid is discharged. The third liquid is discharged from the nozzle holes of the discharge chamber of the droplet discharge section, the fourth liquid is discharged from the nozzle holes of the discharge chamber of the fourth droplet discharge section, and is discharged from these nozzle holes. 6. The dot row in which the discharged liquid is repeated in the nozzle row direction in the arrangement order of the discharge chambers. Liquid droplet ejection head of.   The liquid droplet ejection head according to claim 1, wherein a diaphragm is provided between the common liquid droplet chambers configured to be stacked.   The liquid droplet ejection head according to claim 1, wherein the liquid droplet ejection head is of a face eject type.   The liquid droplet ejection head according to claim 1, wherein the liquid droplet ejection head is of an edge eject type. A nozzle row composed of a plurality of nozzle holes, a plurality of discharge chambers communicating with the respective nozzle holes, a plurality of common droplet chambers communicating with each of the discharge chambers and supplying a liquid to the discharge chambers, A vibration plate formed on the bottom surface, and driving means for displacing the vibration plate to discharge the liquid in the discharge chamber from the nozzle hole,
The plurality of common droplet chambers has a stacked structure formed by stacking,
A plurality of discharge chambers communicate with each common droplet chamber to form a plurality of droplet discharge portions,
A droplet discharge head in which discharge chambers of the droplet discharge units are arranged in the nozzle row direction, and nozzle holes communicating with the discharge chambers of the droplet discharge units are arranged in a line;
A droplet discharge apparatus comprising:

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