KR100390119B1 - Ink-jet head and method of manufacturing color filter - Google Patents

Abstract

Provided are a color filter manufacturing method and an ink jet head capable of reducing the color filter cost and making the color density of the color filter uniform.

A method of manufacturing a color filter in which ink droplets are ejected to pixel compartments on a color filter substrate using an ink jet head to form a colored layer of the color filter, wherein a plurality of ink droplets are simultaneously applied to one pixel compartment and each ink is used. Characteristics such as volume and emergency velocity of the droplets were uniformly discharged.

Description

Manufacturing method of ink jet head and color filter {INK-JET HEAD AND METHOD OF MANUFACTURING COLOR FILTER}

In recent years, with the development of personal computers, especially portable computers, the demand for liquid crystal monitors, especially color liquid crystal monitors, tends to increase. However, in order to spread it further, it is necessary to reduce the cost of the liquid crystal monitor, and in particular, the demand for the cost reduction of the color filter having a high specific gravity is increasing.

The main manufacturing method of a color filter includes a printing method, an electrodeposition method, a dyeing method, or a pigment dispersion method. Hereinafter, each method is demonstrated.

First, the printing method repeatedly prints on the curable resin used as a colored layer, dividing three colors of red (hereinafter referred to as R), green (hereinafter referred to as G) and blue (hereinafter referred to as B), The thermosetting resin is heat cured to form a colored layer. In that case, what disperse | distributed a pigment is used as a coating material.

This printing method is simple but has the disadvantage of poor color filter resolution and flatness.

Next, in the electrodeposition method, a transparent electrode is patterned on a transparent substrate, and the first color is electrodeposited by immersing it in an electrodeposition coating liquid containing pigment, resin, electrolyte solution and the like. This process is repeated three times to form colored layers of R, G, and B, and finally baked.

Although this electrodeposition method is excellent in the flatness of a color filter, there exists a fault that the color pattern of the color filter which can be formed is limited.

Next, the dyeing method is carried out by adding a photosensitive agent to a water-soluble polymer material, which is a material for dyeing, on a glass substrate, and then photosensitive the patterned photosensitive layer into a desired shape by a photolithography step. Get This process is repeated three times to form colored layers of R, G and B.

This dyeing method has a drawback that the color of the color filter is clear, but the weather resistance, light resistance, heat resistance and hygroscopicity of the color filter are inferior.

Finally, the pigment dispersion method first forms a photosensitive resin layer in which a pigment is dispersed on a substrate, and then patterned this to obtain a monochromatic pattern. In addition, by repeating this process three times, three colored layers of R, G, and B are formed.

This pigment dispersion method is disadvantageous in that a material loss is large because 70% or more of the material to be applied is discarded at the time of patterning.

It is common for all these four methods to form a protective layer on a colored layer.

In addition, since the above four methods form colored layers of three colors R, G, and B, it is necessary to repeat the same process three times, which inevitably increases the manufacturing cost and lowers the yield and productivity. There was a flaw.

In order to solve these drawbacks, the manufacturing method of the color filter using the inkjet method is already proposed, This is for example, Unexamined-Japanese-Patent No. 59-75205, Unexamined-Japanese-Patent No. 63-235901, Japan Japanese Patent Laid-Open Publication No. 1-217302, Japanese Patent Laid-Open Publication No. 4-123005, Japanese Patent Laid-Open Publication No. 7-146406, and the like.

In this ink jet method, a coloring liquid (hereinafter referred to as ink) containing respective pigments of R, G, and B is discharged to a color filter substrate by a nozzle, and the ink is dried on a transparent substrate serving as a color filter to form a colored layer. It is.

According to this ink jet method, since each colored layer of R, G, and B can be formed at once, and waste is not generated even when the amount of ink is used, it is expected to obtain a significant improvement in productivity and cost reduction. Can be.

This ink jet method uses two methods, a thermal ink jet head (also called a bubble jet head) for ejecting ink droplets using thermal energy, or a direct mode deformation of a piezoelectric element (a property in which piezoelectric ceramics are distorted). A method of directly coloring the coloring portion of the color filter with ink of each color using a piezo head which discharges ink droplets, and first forming the ink receiving layer from a material which absorbs liquid such as cellulose, acrylic resin, gelatin, There are two methods of dyeing with the ejected ink.

First, a method of directly coloring a color filter substrate comprises discharging ink droplets into a pixel compartment divided into a frame (black matrix) on the color filter substrate, filling a predetermined amount of ink into the pixel compartment, and drying and solidifying the ink. It forms a colored layer.

In that case, in order to ensure the flatness of a frame body and a colored layer, the height of a frame body is restrict | limited to the height at the time of ink solidification. For this reason, the ink is filled with the amount exceeding the height of the frame by calculating the volume reduction due to drying, and the ink is filled into the frame made of the photosensitive resin material so that it becomes a convex meniscus and remains stable. By containing a fluorine-type material, the liquid repellent property is added.

A method of discharging ink by filling the frame body with an ink jet head will be described with reference to Figs. 8A to 8E.

8A to 8E are explanatory views showing a method of manufacturing a color filter by a conventional ink jet method of directly coloring a color filter substrate, and showing the case where four ink droplets are discharged in one pixel compartment.

8A shows the shape of the first ink droplets before the impact, FIG. 8B shows the shape of the second ink droplets before the collision, FIG. 8C shows the shape of the third ink droplets before the collision, and FIG. 8D shows the shape of the first ink droplets before the impact. 8E shows the shape after the collision of the fourth ink droplets, respectively.

8A to 8E, reference numeral 81 denotes an ink jet head in which one nozzle 84 is provided in one pressure chamber 82, and reference numeral 82 is supplied by an ink supply source (not shown). Pressure chamber filled with the filled ink, reference numeral 84 denotes a nozzle for discharging ink filled in the pressure chamber 82, reference numeral 85 denotes a pixel compartment, and reference numeral 86 denotes a transparent substrate to be a color filter (hereinafter, Reference numeral 87 denotes a frame formed by a black matrix, reference numeral 88a denotes first ink droplets ejected to the pixel compartment 85, and reference numeral 88b denotes a pixel. Second ink droplets ejected secondly with respect to the compartment 85, reference numeral 88c are third ink droplets ejected third with respect to the pixel compartment 85, and reference numeral 88d is pixel compartments 85 The fourth ink droplets ejected with respect to the fourth ink droplets and the reference numerals 89a, 89b, 89c, and 89d are respectively the ink droplets 88a, 88b, 88c, and 88d. It is the filling ink after colliding with.

In FIG. 8A, the ink jet head 81 is filled with ink in the pressure chamber 82, and ink droplets are ejected from the nozzle 84 toward the pixel compartment 85 of the color filter substrate 86. As shown in FIG.

When the ink droplets 88a collide with the surface of the color filter substrate 86, as shown in Fig. 8B, the filling ink 89a spread by colliding between the frame bodies 87 is obtained. At this time, the ink jet head 81 and the color filter substrate 86 continue to move relative to each other so that the ink droplets do not collide with the same point, and the second, third, and fourth ink droplets (in the order of FIGS. 8B to 8D) 88b, 88c, and 88d are discharged from the ink jet head 81, and the frame 87 is filled with the filling ink 89c. After the predetermined amount of ink is filled into the frame 87, as shown in FIG. 8D, the height of the filling ink 89d becomes higher than the height of the frame 87, so that a convex meniscus is formed. .

In the method of coloring the receiving layer with ink, an ink receiving layer on the pixel area partitioned by a black matrix film on the color filter substrate is formed in advance, and ink droplets are discharged as in the case of coloring the color filter substrate directly toward the receiving layer. The color filter is formed by absorbing impingement ink in the receiving layer in front of the pixel region.

The conventional ink jet method is constructed as described above, and unlike the conventional method of forming a color filter by paint printing, chemical process or the like, it is not necessary to repeat the same process for each color, resulting in a good yield rate by repeating the process. It was expected to produce a color filter without causing any deterioration or an increase in production cost, and no waste of filter material.

However, the manufacturing method of the color filter by the conventional inkjet method had the problem described below.

Hereinafter, the subject of this prior art is demonstrated using FIGS. 8A-8E and 9A-9C.

9A to 9C are schematic diagrams showing a colored layer of a color filter manufactured by a conventional ink jet method, and FIGS. 9A and 9B show a case in which a color filter substrate is directly colored, and FIG. 9C shows an aqueous layer on a color filter substrate. The case of coloring is shown, respectively.

In the drawings, the same reference numerals as those in Figs. 8A to 8E denote the same or equivalent, and reference numeral 90 denotes a color fading and reference numeral 91a, 9lb, 91c, 91d showing a portion where ink is not filled in the pixel compartment. ) Denotes a first ink dot, a second ink dot, a third ink dot, a fourth ink dot, reference numeral 92 denotes an overlapping portion of the ink dot, reference numeral 93 denotes a single portion of the ink dot, Reference numeral 94 denotes menstrual ink over the frame 87, reference numerals 95a, 95b, 95c, 95d, 95e, 95f, 95g, 95h, 95i are colored layers, and reference numerals 99b, 99e are respectively. It is the filling ink of the colored layers 95b and 95e.

In this conventional ink jet method, when the frame 87 is filled with predetermined ink droplets from an ink jet head to directly color the color filter substrate, a large convex meniscus is used when the last ink droplet enters the frame 87. Is formed in the frame body 87, a wave may occur in the filling ink due to the impact of the last ink droplet colliding therewith, and the overflowed ink may penetrate the frame body into the adjacent frame body and cause mixed color.

FIG. 9A shows a state where the ink 99b of such an ink filled region has penetrated the colored layers 95a and 95c adjacent to the original colored layer 95b beyond the frame 87. This mixed color is particularly likely to occur at a portion where the ink holding ability is lowered due to the shape of the frame 87 and the liquid repellency gap added to the frame 87.

In addition, when the residue of liquid repellent material etc. remains on the color filter substrate surface of the coloring part partitioned by the frame body, as shown in FIG. 9B, the filling ink 99e does not spread uniformly to the edge part in a pixel compartment. Instead, a pixel in which discoloration 90 has occurred may occur in a plurality of pixels. This is likely to occur near the point of impact of the last ink drop, or at the corners within the pixel compartment.

On the other hand, in the case of dyeing the ink receiving layer on the color filter substrate, as shown in Fig. 9C, after the ink droplets collide with the receiving layer (not shown) at regular time intervals to widen the ink, the ink dots 91a, 91b, 91c, 91d are sequentially formed. ) And absorbed into the receiving layer, the overlap portion 92 and the single portion 93 are formed in the ink dot, whereby unevenness may occur.

As mentioned above, the color filter manufactured by the conventional inkjet method generate | occur | produces mixed color, discoloration, or a stain of an ink, and there existed a problem that a color density did not become uniform.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and the ink jet which realizes the color filter manufacturing method which can make the color density of a color filter uniform, can be manufactured at low cost, and the manufacturing method of the color filter is realized. To provide the head.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a color filter and an ink jet head for use in a liquid crystal display panel and the like, and in particular, an ink for realizing a method for manufacturing a color filter by discharging color ink by the ink jet head and a method for manufacturing the color filter It relates to the improvement of a jet head.

1 is a schematic diagram showing a coloring pattern of a color filter;

2A and 2B are explanatory views showing the manufacturing method of the color filter concerning Example 1 of this invention, FIG. 2A is a figure which shows the state just after ink ejection, and FIG. 2B is a figure which shows the state after ink collision. ,

3 is a schematic view seen from the ink discharge direction of an ink jet head provided with a plurality of nozzles in one pressure chamber;

4 is a schematic view seen from the ink discharge direction of an ink jet head provided with a plurality of pressure chambers and air chambers using shear mode deformation of piezoelectric ceramics;

5 is an explanatory diagram showing a manufacturing method of a color filter according to a second embodiment of the present invention;

FIG. 6 is a schematic view as seen in the ink ejection direction of an ink jet head provided with a plurality of pressure chambers using transverse strain mode deformation of piezoelectric ceramics; FIG.

7 is an explanatory diagram showing a manufacturing method of a color filter according to a third embodiment of the present invention;

8A, 8B, 8C and 8D are explanatory views showing the manufacturing method of the color filter by the conventional inkjet method in the case of directly coloring a color filter substrate, and FIG. 8A is a view before the collision of the first ink. 8B shows the shape before the collision of the second ink droplet, FIG. 8C shows the shape before the collision of the third ink droplet, and FIG. 8D shows the shape before the collision of the fourth ink droplet. 8E is a view showing the shape after the impact of the fourth ink droplet,

9A, 9B and 9C are schematic diagrams showing the colored layers of color filters manufactured by the conventional ink jet method, and Fig. 9A is a diagram showing a case of directly coloring a color filter substrate, and Fig. 9B is a direct color filter. The figure which shows the case of coloring a board | substrate, FIG. 9C is a figure which shows the case of coloring the receiving layer on a color filter substrate.

As described above, according to the invention of claim 1, in the method of manufacturing a color filter in which ink droplets are ejected to pixel sections on a color filter substrate using an ink jet head to form a colored layer, By simultaneously discharging a plurality of ink droplets, in the case of directly coloring the color filter substrate, collision energy is consumed by a force that radially spreads the ink, so that the force to cross the frame is suppressed, and color mixing and discoloration of the ink are suppressed. In the case of coloring the receiving layer on the color filter substrate, ink can be absorbed into the receiving layer after each ink dot is mixed to prevent staining. As a result, in any case, a color filter having a uniform color concentration is produced. can do.

In addition, according to the invention of claim 2, there is provided a nozzle plate having a nozzle row formed of a plurality of nozzles, and a flat plate provided with an actuator deformed by an electrical signal, wherein the space is surrounded by the nozzle plate and the flat plate. Pressure chamber is formed, pressurizes the ink supplied from the ink source to the pressure chamber by the actuator, and discharges ink droplets from the nozzle, thereby simultaneously discharging the ink at a small pitch without crosstalk. It is possible to obtain an ink jet head capable of producing a color filter having a uniform color density.

In addition, according to the invention of claim 3, a plurality of piezoelectric material substrates are formed so that grooves deeper than the length of the groove width are parallel to each other, a nozzle plate formed in plural so that nozzle rows composed of a plurality of nozzles are parallel to each other at a required location; A cover plate for sealing a deep groove of the piezoelectric material substrate, and an actuator for imparting a potential difference to a partition of the deep groove of the piezoelectric material substrate to deform the partition into a shear mode, and the deep groove of the piezoelectric material substrate; A plurality of pressure chambers are formed by a space surrounded by the nozzle plate, the cover plate, and the actuator at the position where the nozzle row is formed, and the deep groove of the piezoelectric material substrate and the nozzle where the nozzle row is not formed. The space surrounded by the plate, the cover plate and the actuator is deformed by the actuator Air chambers, the pressure chambers and the air chambers are alternately arranged, and the ink filled in the plurality of pressure chambers from an ink supply source is pressurized by the actuator, and the ink droplets are discharged from the nozzles. It is possible to reduce crosstalk by reducing interference when two pressure chambers are driven, and to discharge ink droplets at the same time and to uniformize the characteristics such as volume and emergency speed of ink droplets. An ink jet head can be obtained which can produce one color filter.

In addition, according to the invention of claim 4, a plurality of piezoelectric material substrates formed so that the grooves shallower than the groove width are parallel to each other, a nozzle plate formed of a plurality of nozzle rows formed of a plurality of nozzles in a straight line, and a piezoelectric material substrate An actuator for imparting a potential difference to deform the piezoelectric material substrate in a lateral deformation mode, and a diaphragm for sealing a shallow groove of the piezoelectric material substrate and displacing the actuator by the actuator, the shallow groove of the piezoelectric material substrate and the nozzle. A plurality of pressure chambers are formed by the space enclosed by the plate and the diaphragm, and the ink filled in the plurality of pressure chambers by the ink supply source is pressurized by the displacement of the diaphragm to discharge ink droplets from the nozzle, At the same time, the characteristics of the droplets and the speed of Can be discharged so as to be one, it is possible to obtain an ink jet head capable of producing a color filter, the color density uniformly as the cost of equipment.

Further, according to the invention of claim 5, the ink jet head according to any one of claims 2 to 4, wherein the colored layer is formed in a pixel compartment in which the shape is generally rectangular and the ratio of the length of the long side and the short side is three or more. The nozzle row is arranged so that the number of nozzles based on the shape of the pixel compartment is provided in parallel with the long side direction of the pixel compartment and at the same nozzle spacing, so that the collided ink droplets are efficiently in the pixel compartment. An ink jet head can be obtained which can be spread to produce a color filter having a uniform color density.

Further, according to the invention of claim 6, in the ink jet head according to any one of claims 2 to 4, the nozzle row corresponds to nozzles located at both ends of the nozzle chamber on the short side wall of the pressure chamber. By setting the length of the short side wall more than the length, the actuator gives a uniform and large pressure to the ink filled in the pressure chamber with a slight deformation, and uniforms all the characteristics such as the volume and the emergency speed of the ejected ink droplets. Since it is possible to make it possible, an ink jet head capable of producing a color filter having a uniform color concentration can be obtained.

Further, according to the invention of claim 7, in the ink jet head according to claim 3 or 4, the actuator has the partition or the piezoelectric material substrate, a signal electrode and a common electrode, and a signal electrode and By simultaneously deforming all the barrier ribs or the piezoelectric material substrates on the basis of the first and second signals and potential differences applied to the common electrode, respectively, the ink jet head can be miniaturized, simplified, and reduced in cost. The facility can obtain an ink jet head capable of producing a color filter.

Further, according to the invention of claim 8, the ink jet head according to any one of claims 2 to 4 allows a plurality of ink droplets to be simultaneously drawn for one pixel compartment, By uniformly discharging the discharge characteristics, a color filter having a uniform color concentration can be manufactured at low cost by the ink jet method.

(Example 1)

In the method for manufacturing a color filter according to the first embodiment of the present invention, a plurality of ink droplets are simultaneously placed in one pixel compartment using an ink jet head provided with a plurality of nozzles in one pressure chamber, It discharges so that characteristics, such as an emergency speed | rate, may be made uniform, and the colored layer of a color filter is formed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the coloring pattern of the color filter manufactured by the manufacturing method of the color filter which concerns on Example 1 of this invention.

In the drawing, reference numeral 6 denotes a transparent substrate (hereinafter referred to as a color filter substrate) to be a color filter, reference numeral R denotes a red colored layer, reference numeral G denotes a green colored layer, and reference numerals. (B) is a blue colored layer, and this color filter is a colored pattern in which three colors are patterned in stripe shape. Reference numeral 7 denotes a frame formed of a black matrix.

And, there are the following two methods as a method for producing the colored layer (R, G, B) using the ink jet head.

First, a method of directly forming a colored layer using an ultraviolet curable ink containing a pigment and a dye is filled with ink in a frame 7 of a black matrix having liquid repellency with an ink jet head, and solidified to dry the colored layer. To form.

On the other hand, the ink mixed with the coloring dye and the method to use the dye layer are provided with an ink receiving layer on a black matrix formed in a lattice pattern by sputtering and photolithography of chromium, and ink is attached to the receiving layer by an ink jet head. By absorbing, a colored layer is formed.

First, the manufacturing method which forms a colored layer by filling ink with the frame of a black matrix is demonstrated using FIG. 2A and FIG. 2B.

2A and 2B are explanatory views showing the manufacturing method of the color filter concerning Example 1 of this invention, FIG. 2A shows the state just after ink discharge, and FIG. 2B shows the state after ink collision, respectively.

In the drawings, the same reference numerals as in FIG. 1 denote the same or equivalent ones. Reference numeral 1 is an ink jet head provided with a plurality of nozzles 4 (4a to 4d in this example) in one pressure chamber 2, and reference numeral 2 is ink supplied from an ink supply source (not shown). At the same time, the pressure chamber for pressurizing the ink to be filled in the color filter substrate with the actuator, the reference numeral 3 is installed on the front of the pressure chamber 2, the nozzle row 5 is formed, the pressure chamber 2 A nozzle plate for sealing the plurality of nozzles, the reference numeral 4 is a plurality of nozzles for discharging the ink filled in the pressure chamber 2, the reference numeral 5 is a plurality of nozzles 4a to 4d arranged at equal intervals and in line with each other Nozzle row, reference numeral 7 denotes a frame formed of a black matrix, reference numeral 8 denotes ink droplets discharged from the plurality of nozzles 4a to 4d, and reference numeral 9 denotes the frame 7. Pixel compartment divided by reference numeral 10 denotes an ink discharge direction, and reference numeral 11 denotes a convex meniscus. The filling is filling ink, which is formed from ink droplets 8a to 8d discharged simultaneously from the nozzles 4a to 4d.

In addition, the ink ejection position of the ink jet head 1 is a position where the center of the nozzle row 5 overlaps with the center of the pixel compartment 9 when viewed in the ink ejection direction 10.

In the case where the shape of the pixel compartment 9 is generally rectangular and the ratio of the lengths of the long side and the short side is three or more, the number of the plurality of nozzles 4 provided in one pressure chamber 2 is equal to the size of the pixel compartment 9. The integer is close to the ratio of the length of the long side and the short side. This is to allow the colliding ink droplets to spread efficiently within the pixel compartment.

Next, the operation will be described.

The ink jet head 1 drives the ink jet head 1 from a movement control circuit (not shown) when the frame 7 on the upper surface of the color filter substrate 6 moves to the discharge position of the ink jet head 1. An ink ejection signal is output to the circuit, and the ink filled in the pressure chamber 2 is pressurized with an actuator or the like based on the ink ejection signal, and the nozzles 4a, 4b, 4c and 4d of the nozzle row 5 are pressurized. Ink droplets 8a, 8b, 8c, and 8d are ejected at the same time. These ink droplets 8a, 8b, 8c, and 8d have almost uniform characteristics such as volume and emergency speed, and they collide almost simultaneously with the surface of the substrate 6 of the pixel compartment (ink filling region) 9 at different collision points. Then, it is crushed at the next moment and spread radially about the point of collision, forming a thin columnar ink dot. Next, the ink dot flows in the pixel compartment 9, and the shape of the dot is disturbed to form a filling ink 11 which forms a convex meniscus together with other ink dots.

In the experiment, when ink droplets having a viscosity of 10 to 15 cp and a volume of 15 to 30 pl were impinged on the pixel compartment 9 of the color filter substrate 6 at an emergency speed of 4 to 7 m / s, the diameter of the ink dot was about 60 to 90. Μm. If the types of the ink and the color filter substrate are the same, the diameter of the ink dot is determined by the volume of the ink droplets and the emergency speed of the ink droplets, so that the appropriate ink is selected from the size of the pixel compartment 9 and the amount of the filling ink 11. The diameter of the dot can be selected.

As described above, in the first embodiment, since the plurality of ink droplets 8 collide simultaneously with the surface of the transparent substrate 6, each ink dot is formed simultaneously in the pixel region (ink filling region) 8 simultaneously and simultaneously. The ink spreads over the entire ink filling region due to the interference force between adjacent ink dots.

On the other hand, in the ink filling method in which the conventional ink droplets are in sequence, the ink droplets are discharged one by one, so that the convex menis of the ink filling regions formed in the previously ejected ink droplets 8a, 8b and 8c. When the last ink droplet 8d enters the curse, a large wave is generated in the meniscus, and the ink may overflow from the frame 7 to the adjacent pixels.

However, in the ink filling method of the first embodiment, since all the ink droplets 8a, 8b, 8c, and 8d collide simultaneously with the surface of the color filter substrate 6, the ink of the respective ink droplets is transferred to the substrate 6 surface. Energy is consumed by the force to spread to, and the force to pass the frame 7 of the ink is suppressed.

In addition, in the conventional method, discoloration may occur without ink penetrating into the corner portion of the ink filling region near the collision position of the last ink droplet 8d. This is because when the ink filled by the preceding ink droplets 8a to 8c is filled leaving the edges of the ink filling area, even if the final ink droplets 8d rush over the filling ink, pressure flows to the filling ink side, and the corners This is because ink is difficult to penetrate.

Also in this case, in the method according to the first embodiment, other ink droplets 8a and 8b are placed on the surface of the transparent substrate 6 near the corners of the ink filling region corresponding to the collision position of the final ink droplet 8d of the conventional method. 8c) directly impinges on the surface of the transparent substrate 6, so that ink easily penetrates to the edge of the ink filling region 8 by the force of radially spreading the ink on the surface of the transparent substrate 6 after the collision. It works.

Also in the case of discharging ink droplets to the accommodating layer, according to the first embodiment, a plurality of ink droplets collide uniformly and simultaneously into the accommodating layer, so that adjacent ink dot interference portions on the accommodating layer are mixed after being mixed in a liquid state. Therefore, the density | concentration unevenness of the overlapping part of the ink dot seen by the conventional method is eliminated.

Next, the relationship between the pressure chamber and the nozzle of the ink jet head in Example 1 is demonstrated using FIG.

3 is a schematic view of an ink jet head provided with a plurality of nozzles in one pressure chamber as viewed in the ink discharge direction.

Here, the case where four nozzles are formed is shown. These nozzles are arranged in line with the shape of the ink filled region of the color filter.

In the drawings, the same reference numerals as those in Figs. 2A and 2B denote the same or equivalent ones. Reference numeral 12 is a long side wall of the pressure chamber 2 made of flat plates 14a and 14b provided with an actuator (not shown), and reference numeral 13 is a pressure chamber 2 made of flat plates 14c and 14d. Reference numeral L denotes the length of the inner side of the pressure chamber 2 long side wall 12, and reference numeral W denotes the length of the inner side of the pressure chamber 2 short side wall 13. The symbol S is the length from the center of the nozzles 4a and 4d located at both ends of the nozzle row 5 to the short side wall 13.

These four nozzles 4a to 4d are provided in one pressure chamber 2. The cross-sectional shape of the pressure chamber 2 is a rectangle having the long side wall 12 of the axial length L of the nozzle row 5 and the short side wall 13 of the width W perpendicular thereto. The space | interval S from the short side wall 13 to the center of the nozzle of the both ends of the nozzle row 5 is comprised by the length more than the width W of the short side wall 13. Moreover, the actuator which is not shown in figure for pressurizing the ink in the pressure chamber 2 is provided in the long side wall 12 of the cross section of the pressure chamber 2, and is comprised so that it may displace in the direction perpendicular to the long side wall 12. As shown in FIG. .

Here, the installation of the plurality of nozzles 4 in one pressure chamber 2 depends on the following circumstances.

In other words, the pixel pitch of a representative color filter is about 300 μm, for example, for a 0.4 inch VGA (640 × 480 dot) liquid crystal panel, for a 330 μm, 18.1 inch SVGA (1024 × 1024 dot) liquid crystal panel. It is 280 micrometers. Although the number of nozzles suitable for this pixel compartment is four, it is very important for a normal (for printer) ink jet head 1 to arrange these four nozzles 4 at a pitch of 60 µm within 300 µm and to simultaneously discharge ink. It is difficult. This is because, for example, the minimum pitch in the piezo system is about 141 µm and the minimum pitch in the bubble jet system is about 71 µm, which exceeds 60 µm.

Also, in such narrow pitch heads, the distance from adjacent channels is shortened, so that crosstalk, that is, pressure vibration when ejecting ink in a certain channel, affects the adjacent channels, thereby ejecting ink droplets from adjacent nozzles simultaneously. In this case, since the ejection performance in the case of a large amount of defects in the ejection performance in the case of ejecting ink droplets from one nozzle is large, the printer ink jet head avoids ejecting ink droplets from adjacent nozzles simultaneously. At the same time, one nozzle is provided in the pressure chamber, and the ejection timing of the individual nozzles in the plurality of pressure chambers is delayed to achieve ink droplet ejection over all the nozzles.

However, the idea of providing one nozzle in one pressure chamber is indispensable for printer use, but it is not necessary for the manufacture of color filters. This is because, as already mentioned, when ink droplets are ejected one by one, staining or the like occurs.

Therefore, the ink jet head 1 is specialized for manufacturing color filters, and the nozzles 4 arranged in the compartments are arranged in the same pressure chamber 2 so that a plurality of ink droplets can be discharged simultaneously and the nozzles are narrow. It was conceived to obtain an ink jet head optimized for the production of color filters which can be arranged at pitch.

However, in the ink jet head optimized for manufacturing such a color filter, the ejection characteristics of each nozzle are provided, and it is essential that no crosstalk occurs even though the nozzle is a narrow pitch nozzle.

As a result of earnestly research by this inventor, it discovered that this can be implement | achieved with the following structures.

First, the cross-sectional shape of the pressure chamber 2 of the ink jet head optimized for producing such a color filter will be described.

In Fig. 3, in order to obtain the same ejection characteristics from any nozzle 4 in the nozzle row 5, it is effective to insert the nozzle row 5 into parallel plates so that the parallel plane flow of ink in the previous nozzle is added.

And the position of the short side wall 13 used as the side wall of a parallel plate is so that this short side wall 13 may not influence the flow of the nozzle of the both ends of the nozzle row 5 of the nozzle 4a, 4d of the both ends. The distance S from the center to the short side wall 13 is set to the distance between parallel plates, that is, the short side length W or more. It is preferable to make this short side length W into the magnitude | size more than twice the diameter of a nozzle.

In order to effectively pressurize the ink in the pressure chamber 2 of this shape, the length S from both end nozzles to the short side wall is equal to the flow of ink discharged from both end nozzles 4a and 4d. It is installed above the length W inside the short side wall 13 so as not to be affected, and the nozzle row 5 is installed on a straight line parallel to the long side wall 12 and passing through the center of the short side wall 13. Moreover, it is preferable to make length W of the inside of the short side wall 13 into 2 times or more of the nozzle diameter.

By doing in this way, uniform and large pressure can be given to ink by slight displacement of the long side wall 12. FIG.

As described above, according to the first embodiment of the present invention, a plurality of ink droplets 8a, 8b, 8c, and 8d are simultaneously placed in one pixel compartment 9, and the characteristics such as volume and emergency speed of ink droplets are uniform. In this case, when the color filter substrate 6 is directly colored, the collision energy is consumed by the force of radially widening the ink, and the force to cross the frame 7 is suppressed. Mixing and discoloration can be prevented, and in the case of coloring the receiving layer on the color filter substrate 6, after each ink dot is mixed, the ink can be absorbed into the receiving layer to prevent unevenness. A color filter having a uniform color concentration can be produced.

Further, in Example 1 of the present invention, by using the ink jet head 1 in which a plurality of nozzles 4 are provided in one pressure chamber 2, ink is discharged simultaneously at a small pitch without causing crosstalk. Since it is possible, a color filter having a uniform color concentration can be produced.

Furthermore, in Example 1 of this invention, it has the long side wall 12 of the pressure chamber 2 which consists of a flat plate provided with an actuator, and shortens the length S from both end nozzles to the short side wall 13. By using the ink jet head 1 provided to be equal to or greater than the length W inside the side wall 13, the actuator gives a uniform and large pressure to the ink filled in the pressure chamber 2 with slight deformation. All the characteristics such as the volume and the emergency speed of the ink droplets 8a, 8b, 8c, and 8d to be discharged can be made uniform, and a color filter having a uniform color concentration can be produced.

In addition, in Example 1 of this invention, when the shape of the pixel compartment 9 is substantially rectangular, and the ratio of the length of a long side and a short side is three or more, the number of the some nozzle 4 with respect to one pressure chamber 2 is carried out. Is an integer close to the ratio between the long side and the short side of the pixel compartment 9, and by using an ink jet head having the nozzles 4 arranged at equal intervals in a row, the collided ink droplets spread efficiently within the pixel compartment. In addition, a color filter having a uniform color concentration can be produced.

(Example 2)

The color filter manufacturing method according to the second embodiment of the present invention uses a plurality of pressure chambers using a plurality of pressure chambers and air chambers using shear mode deformation of piezoelectric ceramics, and a plurality of same colors in the short side direction of the pixel compartment. At the same time, the ink droplets are discharged to the pixel compartment so as to make the characteristics such as the volume and the emergency speed of the ink droplets uniform, thereby forming the colored layer of the color filter.

Fig. 4 is a schematic view of an ink jet head having a plurality of pressure chambers and an air chamber and utilizing the shear mode deformation of the piezoelectric ceramic as viewed in the ink discharge direction.

In the figure, reference numeral 41 denotes a partition wall that closes between the pressure chamber 42 and the air chamber 48. Reference numeral 42 is a plurality of pressure chambers filled with ink, and is composed of a nozzle plate, an actuator 100, a piezoelectric ceramic substrate 49, and a cover plate 50. Reference numeral 45 is a nozzle array formed by providing a plurality of nozzles in parallel to each other, reference numeral 46 is a signal electrode formed of a metal film in a portion corresponding to the upper half of the pressure chamber inner wall, reference numeral 47 is The common electrode formed by the metal film on the upper half of the inner wall of the chamber, and the reference numeral 48 are a plurality of chambers filled with air therein, and the nozzle plate, the actuator, the piezoelectric ceramic substrate 49, and the cover plate. It consists of 50 and does not have a nozzle. Reference numeral 49 is a piezoelectric ceramic substrate formed so that the deep grooves that become the pressure chamber 42 and the air chamber 48 are parallel to each other, and the reference numeral 50 is formed of a ceramic material or a resin material, and the pressure chamber 42. ) And a cover plate for sealing the opening of the deep groove to be the air chamber 48, the reference numeral 52 denotes the polarization direction of the partition 41, the reference numeral V1 denotes the potential applied to the common electrode 47, and the reference. Reference sign V2 is a potential applied to the signal electrode 46.

Reference numeral 100 denotes an actuator, which is composed of a partition wall 41, a signal electrode 46, and a common electrode 47, and the deep grooves of the piezoelectric ceramic substrate 49 are formed in the pressure chamber 42 and the air chamber ( This is formed so that 48) is arranged at predetermined intervals.

The ink jet head 1 shown in FIG. 4 is composed of a piezoelectric ceramic substrate 49 and a cover plate 50 polarized in the same direction as the polarization direction 52, a nozzle plate (not shown) and a driver substrate (not shown). have. In the piezoelectric ceramic substrate 49, a plurality of deep grooves are formed in parallel with the same depth. In the partition wall 41 of the piezoelectric ceramic polarized in the direction 52 between the deep groove and the deep groove, only the upper half is formed with a metal film, and is connected to the groove end portion in the depth direction to connect one signal electrode 46 and the common electrode 47. ) Further, these deep grooves alternately form the pressure chamber 42 and the air chamber 48 of the ink. The nozzle is not formed in the air chamber 48 and is sealed by the cover plate 50 at the groove end portion, and the pressure chamber 42 communicates with the ink supply passage. The cover plate 50 is made of a ceramic material, a resin material, or the like, and is firmly bonded to the piezoelectric ceramic substrate 49 with an epoxy adhesive. In addition, a nozzle plate (not shown) having a nozzle row 45 provided corresponding to the pressure chamber 42 is joined to the front end surfaces of the piezoelectric ceramic substrate 49 and the cover plate 50. The nozzle row 45 is provided in parallel in the depth direction of the groove in which the arrangement axis is deep. The signal electrode 46 of the pressure chamber 42 and the common electrode 47 of the air chamber 48 are connected in common, respectively, and are connected to the driver circuit which is not shown in figure.

From this driver circuit, a voltage of V1 is applied to the common electrode 47 of the air chamber 48, and a potential of V2 is applied to the signal electrode 46 of the pressure chamber 42, thereby providing a potential difference between the partitions 41. If so, the polarization direction 52 and the electric field direction are orthogonal to each other, the upper half of the partition wall receives a shear force, and the partition walls on both sides of the pressure chamber 42 simultaneously displace inwardly as shown by the broken line in the drawing, and the pressure is applied. The ink in the chamber 42 is pressurized. The pressurized ink is discharged as ink droplets from the nozzles in the nozzle row 45. In this case, ink droplets are discharged simultaneously from four nozzles in the nozzle row 45.

That is, the partition 41 is polarized by the potential difference between V1 and V2, and the shear force is applied to the upper half of the partition 41 by the perpendicular direction of the polar direction 52 and the electric field. By the shear force, the partition 41 of the pressure chamber 42 deforms inward and pressurizes the ink filled in the pressure chamber 42 at the same time, as indicated by the broken line in FIG. 4. The partition 41 deforms outward. The ink pressurized by the partition wall 41 is simultaneously discharged from the nozzle row 45 to color a plurality of same-color pixel blocks in a column perpendicular to the moving direction of the color filter substrate.

Here, the air chamber 48 is provided in order to eliminate the influence of crosstalk caused by the interference when the pressure chambers 42 adjacent to each other are driven, which makes the ink droplets stable and accurate in the frame of the pixel compartment. Effective for discharging and colliding with position and quantity.

That is, in the piezoelectric shearing mode type head, ink ejection is performed from all channels of a conventional adjacent channel, which is an effective method for shortening the nozzle pitch, and is effective for a print head aimed at speeding up. In other words, crosstalk cannot be avoided because pressure vibration is applied to other channels through the ink in the channel sidewall and the adjacent channel.

On the other hand, in Embodiment 2, high-precision ink discharge amount control is considered to be optimized for the manufacture of color filters having a relatively low resolution, and nozzles are removed from adjacent channels of the ink discharge channels, and the channels are made into air layers.

This makes it possible to prevent the pressure vibration occurring through the ink of the adjacent channel, which has occurred conventionally, so that high-precision and highly stable ink ejection without crosstalk is possible.

This is because propagation of pressure vibrations through the air layer does not occur because the elastic modulus of air is very low as compared with ink.

And even when these air chambers 48 are provided, it is possible to adjust the pitch of the pressure chamber 42 to the pixel pitch of the specific color of a color filter. Moreover, by providing this air chamber 48, it becomes possible to drive many pressure chambers 42 only by the signals V1 and V2 of two systems, and the driver circuit is simplified and contributes to the overall cost reduction.

That is, in the piezoelectric shearing mode type head in which nozzles are provided in all conventional continuous channels and ink ejection is possible from each nozzle, a signal V1 (negative pressure: ink filling) is applied to the ink ejection channel, and then, it continues. By applying the signal V2 (pressure: ink ejection) to the adjacent channel, the ejection of one drop is completed, and when the ink is ejected from the channel to which the signal is now given, the signal V1 continues to be adjacent to the channel. It is necessary to give V1 and V2 to the channel by the discharge pattern in such a manner that the signal V2 is applied to the channel.

On the other hand, if the structure has air layers on both sides of the ink discharge channel of the second embodiment, the signal V1 is applied to the ink discharge channel, and only the signal V2 is applied to the channels of the air layers on both sides.

And when the nozzle pitch of the head which has an air layer is made to match the pixel pitch of a color filter, since the pixel arrangement axis of a color filter and the nozzle arrangement axis of a head can be made parallel, the delay process of the drive signal required when a head inclines. The driver circuit is simplified because no wiring is required and wiring can be discharged at the same time.

For this reason, it is possible to fan out the signal V1 to many discharge channels and the signal V2 to many air channel channels.

It is explanatory drawing which shows the manufacturing method of the color filter which concerns on Example 2 of this invention.

4, the same code | symbol as FIG. 4 has shown the same or equivalent thing. Reference numeral 51 has a plurality of pressure chambers 42 and an air chamber 48, an ink jet head utilizing the shear mode deformation of piezoelectric ceramics, reference numeral 53 denotes the direction of movement of the color filter substrate, reference numeral ( P1) is the interval between the pixel compartments of the same color in the direction of the short side of the pixel compartment. In addition, the pressure chamber 42, the air chamber 48, and the nozzle row 45 are arranged to maintain this gap P1.

Next, the manufacturing method is demonstrated. An ink jet head having a pressure chamber having a pitch equal to the pitch P1 of a specific color of the pixel compartments R, G, and B formed in the color filter substrate 56, and a nozzle row provided perpendicular to the direction in which the pressure chamber is arranged. 51 and the color filter substrate 56 are arranged in the positional relationship as shown in FIG. 5, and the substrate 56 is moved in the direction of the arrow 53 to sequentially collide ink droplets on the pixel compartments at the discharge position of the head. Recharge the ink. The color filter is manufactured by the manufacturing apparatus which performs this manufacturing operation.

As described above, in the second embodiment of the present invention, a plurality of pressure chambers (using the ink jet head 51 provided with the plurality of pressure chambers 42 and the air chambers 48 using the shear mode deformation of piezoelectric ceramics) 42) It is possible to reduce crosstalk by reducing interference when driving, and to eject ink droplets at the same time and to make the characteristics such as volume and emergency speed of ink droplets uniform. One color filter can be made.

In the second embodiment of the present invention, the actuators provided in the pressure chamber 42 and the air chamber 48 are driven by two types of electrodes consisting of the signal electrode 46 and the common electrode 47, thereby providing an ink jet head. The 51 can be downsized, simplified, and low in cost, so that the color filter can be manufactured with a low cost facility.

(Example 3)

The method for manufacturing a color filter according to the third embodiment of the present invention uses a ink jet head provided with a plurality of pressure chambers using lateral strain mode deformation of piezoelectric ceramics, to a plurality of same color pixel compartments in the long side direction of the pixel compartment. At the same time, the ink droplets are discharged at the same time so as to make the characteristics such as the volume of the ink droplets and the emergency speed uniform, thereby forming a colored layer of the color filter.

6 is a schematic view of an ink jet head having a plurality of pressure chambers and using a transverse strain mode deformation of a piezoelectric ceramic as viewed in the ink discharge direction.

In the figure, reference numeral 62 denotes a plurality of pressure chambers filled with ink, and is composed of a nozzle plate, a piezoelectric ceramic substrate 69, and a vibration plate 70. Reference numeral 64 denotes a piezoelectric ceramic plate that deforms in the transverse deformation mode, reference numeral 65 denotes a nozzle array made up of a plurality of nozzles arranged in a straight line on the nozzle plate, reference numeral 66 denotes a signal electrode, reference numeral ( The reference numeral 67 denotes a common electrode, the reference numeral 69 denotes a piezoelectric ceramic substrate in which a plurality of grooves shallower than the groove width are formed in parallel with each other, and the reference numeral 70 seals the opening of the shallow groove of the piezoelectric ceramic substrate 69. The diaphragm, reference numeral V1 is a potential applied to the common electrode 67, and reference numeral V2 is a potential applied to the signal electrode 66. Reference numeral 110 is an actuator and is composed of a piezoelectric ceramic plate 64, a signal electrode 66, and a common electrode 67.

The ink jet head shown here is comprised from the pressure chamber 62, the diaphragm 70, and the piezoelectric ceramic plate 64. As shown in FIG. The pressure chamber 62 has the structure which sealed the opening part of the shallow groove formed in the upper end surface of the ceramic substrate 69 by shaping | molding or cutting with the diaphragm 70. As shown in FIG. The actuator 110 has a piezoelectric ceramic plate 64 bonded to the upper surface of the diaphragm 70 corresponding to the pressure chamber 62, a signal of the common electrode 67 on the upper surface of the diaphragm 70, and the upper surface of the piezoelectric ceramic plate 64. It consists of an electrode 66. The piezoelectric ceramic plate 64 is polarized by applying a high voltage to the common electrode 67 and the signal electrode 66. When a potential difference in driving level is provided between the common electrode 67 and the signal electrode 66 sandwiching the polarized piezoelectric ceramic plate 64 in this manner, an electric field in a direction parallel to the polarization direction is applied to the piezoelectric ceramic plate. Transverse deformation of 64 occurs and contracts in a plate surface direction. Bending stress is applied to the diaphragm 70 by the contraction of the piezoelectric ceramic plate 64, and the diaphragm 70 displaces inward of the pressure chamber 62. A nozzle plate (not shown) is joined to the entire surface of the pressure chamber 62, and a nozzle row 65 is provided corresponding to the position of the pressure chamber 62. The nozzle arrangement axis of the nozzle array 65 is provided in parallel with the joining member of the diaphragm 70 and the piezoelectric ceramic plate 64, ie, the plate surface of the actuator. Also in the case of the transverse deformation mode, an ink jet head suitable for the present invention can be manufactured by forming a shallow groove in the ceramic substrate 69 in this manner and using the actuator as the substrate upper wall which contacts the long side wall of the pressure chamber 62. .

The piezoelectric ceramic plate 64 is polarized by the potential difference between V1 and V2, and transverse strain occurs because the pole direction and the electric field become parallel. The diaphragm 70 is subjected to bending stress by the transverse deformation of the piezoelectric ceramic plate 64, and deforms into the pressure chamber 62 as shown by the broken line in FIG. The pressure chamber 62 pressurizes the ink to be filled by the deformation of the diaphragm 70 and simultaneously ejects ink droplets from the nozzle row 65, so that a plurality of the same color pixels in the column perpendicular to the moving direction of the color filter substrate. Color the compartment.

It is explanatory drawing which shows the manufacturing method of the color filter which concerns on Example 3 of this invention.

In the drawings, the same reference numerals as in FIG. 6 denote the same or equivalent. Reference numeral 71 has a plurality of pressure chambers 62, an ink jet head using a transverse strain mode deformation of piezoelectric ceramics, reference numeral 73 denotes a moving direction of the color filter substrate, and reference numeral P2 denotes a pixel compartment. It is the spacing between pixel compartments adjacent to the long side direction of. In addition, the pressure chamber 62 and the nozzle row 65 are arranged to maintain this interval P2.

Next, the manufacturing method is demonstrated.

A pressure chamber formed at the same pitch as the pitch P2 of the specific color of the pixel sections R, G, and B formed on the color filter substrate 76, and a nozzle row 65 provided in parallel with the arrangement direction of the pressure chamber. The ink jet head 71 and the color filter substrate 76 are arranged in the positional relationship as shown in FIG. 7 so that the substrate 76 moves in the direction of the arrow 73 to sequentially ink the pixel compartments at the discharge position of the head. Charge the droplets by crashing them. The color filter is manufactured by the manufacturing apparatus which performs this manufacturing operation.

As described above, in the third embodiment of the present invention, by using the ink jet head 71 provided with the plurality of pressure chambers 62 using the transverse strain mode deformation of the piezoelectric ceramic, the volume of the ink droplets and Discharge can be performed so that characteristics, such as an emergency speed | rate, can be made uniform, and a color filter with a uniform color density can be manufactured with the installation which reduced cost.

In addition, although the case of manufacturing color filters, such as a liquid crystal display panel, was demonstrated in all the said Examples 1-3, this invention is not limited to this, If the ink is made to collide and fill in cells, such as a recessed part and a division, Applicable

As described above, the method for producing a color filter and the ink jet head according to the present invention are suitable for inexpensively manufacturing a color filter having a uniform color density by discharging ink droplets to a color filter substrate of a liquid crystal monitor.

Claims (8)

In the manufacturing method of the color filter which forms a colored layer by ejecting ink droplets to the pixel block on a color filter substrate using an inkjet head, Characterized in that a plurality of ink droplets are discharged simultaneously for one pixel compartment Method for producing a color filter. A nozzle plate having a nozzle row formed of a plurality of nozzles, A flat plate provided with an actuator deformed by an electric signal, and a pressure chamber is formed in a space surrounded by the nozzle plate and the flat plate, Pressurizing ink supplied from the ink supply source to the pressure chamber with the actuator, and ejecting ink droplets from the nozzle; Inkjet head. A plurality of piezoelectric material substrates formed such that grooves deeper than the length of the groove width are parallel to each other; A nozzle plate formed in plural so that a nozzle row composed of a plurality of nozzles is parallel to each other at a required location; A cover plate for sealing a deep groove of the piezoelectric material substrate; An actuator for imparting a potential difference to the partition walls of the deep grooves of the piezoelectric material substrate and deforming the partition walls in shear mode; A plurality of pressure chambers are formed by a deep groove of the piezoelectric material substrate, a space surrounded by the nozzle plate, the cover plate, and the actuator in a position where the nozzle row is formed, A plurality of air chambers are formed in which a deep groove of the piezoelectric material substrate, a space surrounded by the nozzle plate, the cover plate, and the actuator in a place where the nozzle row is not formed, is deformed by the actuator, The pressure chamber and the air chamber is installed to be alternately arranged, Pressurizing ink filled in the plurality of pressure chambers from an ink supply source with the actuator to eject ink droplets from the nozzle; Inkjet head. A piezoelectric material substrate formed with a plurality of grooves shallower than the groove width in parallel with each other, A nozzle plate having a plurality of nozzle rows formed of a plurality of nozzles on a straight line, An actuator for imparting a potential difference to the piezoelectric material substrate to deform the piezoelectric material substrate into a transverse strain mode; A diaphragm which seals a shallow groove of the piezoelectric material substrate and is displaced by the actuator, A plurality of pressure chambers are formed by a space surrounded by a shallow groove of the piezoelectric material substrate, the nozzle plate and the vibration plate, It is characterized by ejecting ink droplets from the nozzle by pressing the ink filled in the plurality of pressure chambers from the ink supply source by the displacement of the diaphragm. Inkjet head. The method according to any one of claims 2 to 4, When the colored layer is formed in a pixel compartment in which the shape is coarse rectangular and the ratio of the length of the long side to the short side is three or more, The nozzle row is, A number of nozzles based on the shape of the pixel compartment is provided in parallel with the long side direction of the pixel compartment and at the same nozzle interval. Inkjet head. The method according to any one of claims 2 to 4, When the colored layer is formed in a pixel compartment in which the shape is coarse rectangular and the ratio of the length of the long side to the short side is three or more, The nozzle row is installed so that the nozzles located at both ends are separated from the short side wall of the pressure chamber by more than the length of the short side wall. Inkjet head. The method according to claim 3 or 4, The actuator is, The barrier rib or the piezoelectric material substrate, the signal electrode and the common electrode, and simultaneously deform all the barrier ribs or the piezoelectric material substrate based on the first and second signals and potential differences applied to the signal electrode and the common electrode, respectively. Characterized by Inkjet head. The method according to any one of claims 2 to 4, Characterized in that a plurality of ink droplets are discharged simultaneously with respect to one pixel compartment, and the discharge characteristics of each ink droplet are uniformly discharged. Method for producing a color filter.