JP5159679B2 - Ink liquid filling method and color filter manufacturing method - Google Patents

Description

  The present invention relates to an ink liquid filling method and a color filter manufacturing method.

  Color filters are used for color liquid crystal displays, organic EL displays, and the like. The color filter includes pigments such as pigments and dyes by relatively scanning a transparent substrate in which a plurality of concave element formation regions surrounded by partition walls are arranged in a matrix and an inkjet head having nozzle holes. Ink droplets are ejected as ink droplets from the nozzle holes to the element forming region to form an ink liquid reservoir in the element forming region, and the transparent substrate is manufactured by baking including the ink liquid reservoir in the element forming region.

  However, in the manufacturing method as described above, wrinkles that affect the optical characteristics of the color filter may occur on the upper surface of the ink reservoir in the baking process. If the fluidity of the ink liquid reservoir in the element formation region is higher on the transparent substrate side (bottom side) than on the upper surface side before entering the firing step, that is, the upper surface side of the ink liquid reservoir on the transparent substrate side. It is known that it is likely to occur when curing of the resin proceeds.

  As a technique for suppressing the generation of wrinkles, a technique described in Patent Document 1 is known. In this technology, when manufacturing a color filter, a coating material in which a pigment is dispersed in an ultraviolet curable resin is applied to the surface of a transparent glass substrate, and the transparent glass is applied to the coating material on the transparent glass substrate before the firing step. This is a technique for preventing generation of wrinkles on the surface of the coating material in the baking process by irradiating ultraviolet rays from the back surface of the substrate.

  Therefore, by using the technique described in Patent Document 1, it is possible to suppress the occurrence of wrinkles on the upper surface of the ink liquid reservoir in the element formation region in the baking process.

JP-A-9-230132

  However, when the technique described in Patent Document 1 is used, ultraviolet rays are irradiated to the ink reservoir through glass having a property that the absorption coefficient is remarkably increased in the wavelength region of ultraviolet rays. Compared to the above, there is a problem that the irradiation time must be lengthened and the productivity is significantly reduced. In some cases, plastic is used as the material of the transparent substrate. However, since the absorption coefficient of plastic further increases in the wavelength region of ultraviolet rays as compared with glass, productivity is further reduced.

  The present invention has been made to solve the above problems, and an ink liquid filling method and a color filter manufacturing capable of suppressing the occurrence of wrinkles on the upper surface of the ink liquid reservoir without causing a significant decrease in productivity. It aims to provide a method.

In order to achieve the above object, the ink liquid filling method according to claim 1 is characterized in that the curing sensitivity is gradually increased layer by layer from the lower layer to the upper layer in the region surrounded by the partition on the medium on which the ink liquid is ejected. In response to specific energy so that a laminate is formed in which a plurality of ink liquid layers are formed, and the content of the curing accelerator gradually decreases from the lower layer to the upper layer in units of layers. The ink liquid to be filled is filled.

According to the ink liquid filling method of claim 1, by applying a specific energy to the laminate, curing of the lower ink liquid layer can proceed more than the upper ink liquid layer, resulting in production. It is possible to suppress the occurrence of wrinkles on the upper surface of the ink liquid reservoir without causing a significant decrease in properties.

Further, the method of the ink filled in the ink liquid, light curing accelerator to accelerate the curing in response to light energy, and at least one thermally curing accelerator to promote the reaction to cure the heat energy It may be contained. Alternatively, the ink liquid may contain a photosensitizer that causes photosensitization in response to light energy. Thereby, the curing of the lower ink liquid layer can proceed more easily than the upper ink liquid layer.

In the above ink liquid filling method, the area is rectangular, a plurality of the areas are arranged in a matrix on the medium , and the ink liquid is filled so that the laminate is formed in each area. It is good also as what to do. Thereby, the ink liquid distribution in each region on the recording medium can be made uniform.

In the ink liquid filling method, the partition may be formed of a liquid repellent material that repels ink liquid. As a result, the ink liquid can be prevented from flowing over the partition and out of the region.

On the other hand, in order to achieve the above object, a color filter manufacturing method according to claim 6 uses the ink liquid filling method according to any one of claims 1 to 5, and the medium is a transparent substrate. Is.

  Therefore, according to the color filter manufacturing method of the present invention, since it operates in the same manner as the invention of any one of claims 1 to 5, it is described in any one of claims 1 to 5. Similar to the invention, it is possible to suppress the occurrence of wrinkles on the upper surface of the ink liquid reservoir without causing a significant decrease in productivity.

On the other hand, in order to achieve the above object, the color filter manufacturing method according to claim 7 contains a photocuring accelerator that accelerates curing in response to light energy in a region surrounded by the partition on the transparent substrate. A step of filling the ink liquid; a step of removing the solvent of the ink liquid filled in the region; and the region having a smaller content of the photocuring accelerator than the ink liquid previously filled in the region and being cured. The step of filling the ink liquid having low sensitivity with the ink liquid previously filled, the step of drying the ink liquid filled in the region, and the light applied to the ink liquid filled in the region. A step of applying energy, and a step of baking the transparent substrate including the ink liquid filled in the region.

According to the color filter manufacturing method of claim 7, the curing of the lower ink liquid layer is advanced than the upper ink liquid layer by applying specific energy to the ink liquid filled in the region. As a result, the occurrence of wrinkles on the upper surface of the ink reservoir can be suppressed without causing a significant decrease in productivity.

  According to the ink liquid filling method and the color filter manufacturing method of the present invention, it is possible to suppress the occurrence of wrinkles on the upper surface of the ink liquid reservoir without causing a significant decrease in productivity.

It is a block diagram which shows the principal part structure of the inkjet recording device which concerns on embodiment. FIG. 3 is a cross-sectional view illustrating a three-dimensional configuration of one droplet discharge element in the ink jet recording apparatus according to the embodiment. It is a figure which shows the structure by the side on which the ink droplet on the transparent substrate which concerns on embodiment is ejected. 1 is a block diagram illustrating a main configuration of an electric system of an ink jet recording apparatus according to an embodiment. It is a flowchart which shows the flow of a process of the droplet ejection control processing program which concerns on embodiment. FIG. 6 is a side cross-sectional view illustrating an example of a state of high-sensitivity ink filled in a droplet ejection region. FIG. 6 is a side sectional view showing an example of a state in which the solvent of the high sensitivity ink filled in the droplet ejection region is removed. FIG. 6 is a side view sectional view showing an example of a state of a laminated body formed in a droplet ejection region. It is a figure which shows the other example of the ink droplet ejection form.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings. In this embodiment, an example of a case where a color filter is manufactured by using an ink jet recording apparatus and filling the ink liquid (hereinafter also simply referred to as “ink”) from the ink jet recording apparatus by the ink liquid filling method of the present invention. Will be described.

  FIG. 1 is a configuration diagram showing a main configuration of an inkjet recording apparatus 10 according to the present embodiment. As shown in the figure, the ink jet recording apparatus 10 includes a red (R) high-sensitivity ink (details will be described later) and a low-sensitivity ink (details will be described later), a green (G) high-sensitivity ink and a low-sensitivity ink. , Blue (B) high-sensitivity ink and low-sensitivity ink, which are provided corresponding to each of the inks, and discharge a corresponding ink droplet, and a plurality of ink jet recording heads (hereinafter referred to as heads) 12 and transparent as a recording medium. A mounting table 16 on which the substrate 14 is mounted, and a motor 18 that is connected to the head 12 and generates power for moving the head 12 along the arrow direction (hereinafter also referred to as “scanning direction”) in FIG. And. Hereinafter, when it is not necessary to distinguish between high-sensitivity ink and low-sensitivity ink, they are simply referred to as “ink”.

  The head 12 includes a nozzle 12A, which is a discharge port for discharging ink droplets, and an ink chamber unit (droplet discharge element) 20 including a pressure chamber and the like corresponding to the nozzle 12A. The mounting table 16 includes a mechanism (not shown) that fixes the transparent substrate 14 serving as a basis of the color filter at a reference position. In the figure, only one head 12 is shown to avoid complications.

  Here, the ink according to the present embodiment will be described. The ink according to this embodiment is a dye ink containing a photopolymerization initiator. The dye ink of R according to this embodiment includes cyclohexanone (manufactured by Wako Pure Chemical Industries) as an organic solvent (solvent), DPCA-60 (manufactured by Nippon Kayaku Co., Ltd.) as a monomer, and KF-353 (Shin-Etsu Silicone Co., Ltd.) as a surfactant. And a dye having a mass ratio of organic solvent: monomer: surfactant: dye = 69.95: 20: 0.05: 10. In addition, the G dye ink according to the present embodiment includes cyclohexanone (manufactured by Wako Pure Chemical Industries, Ltd.) and DCHMA (manufactured by Tokyo Chemical Industry Co., Ltd.) as the organic solvent (solvent), DPCA-60 (manufactured by Nippon Kayaku Co., Ltd.) as the monomer, interface KF-353 (manufactured by Shin-Etsu Silicone) and a dye are used as the activator, and the mass ratio is organic solvent (cyclohexanone): organic solvent (DCHMA): monomer: surfactant: dye = 80.83: 0 .7: 10.35: 0.05: 8.07. In addition, the dye ink of B according to this embodiment includes cyclohexanone (manufactured by Wako Pure Chemical Industries) as an organic solvent (solvent), DPCA-60 (manufactured by Nippon Kayaku Co., Ltd.) as a monomer, and KF-353 (Shin-Etsu) as a surfactant. Manufactured by Silicone Co., Ltd.) and dyes are used, and the mass ratio is adjusted to be cyclohexanone (organic solvent): monomer: surfactant: dye = 62.95: 27: 0.05: 10 .

  As the photopolymerization initiator contained in the ink according to the present embodiment, a photocleavage type that continuously proceeds with polymerization by generating a radical (free radical) by cleaving its chemical bond in response to light. However, the present invention is not limited to this, and a hydrogen abstraction type that generates radicals by extracting hydrogen in the monomer to be photopolymerized may be applied. In the present embodiment, the following compound (1) is applied as the photopolymerization initiator. However, the present invention is not limited thereto, and for example, the following compound (2) may be applied.

上述したように、本実施形態に係るインクは、光重合開始剤を含んで構成されているため、光が照射されることによりインクの硬化が促進される。高感度インクは、低感度インクよりも硬化速度が速いインクである。すなわち、高感度インク及び低感度インクは、光重合開始剤の含有量が低感度インクよりも高感度インクの方が多くなるように（例えば、高感度インクの光重合開始剤：低感度インクの光重合開始剤＝５：１となるように）調製されている。

As described above, since the ink according to this embodiment includes a photopolymerization initiator, curing of the ink is promoted by irradiation with light. The high sensitivity ink is an ink having a faster curing speed than the low sensitivity ink. That is, in the high-sensitivity ink and the low-sensitivity ink, the content of the photopolymerization initiator is higher in the high-sensitivity ink than in the low-sensitivity ink (for example, the photopolymerization initiator of the high-sensitivity ink: Photopolymerization initiator = 5: 1).

  FIG. 2 is a cross-sectional view showing a three-dimensional configuration of one droplet discharge element (a liquid chamber unit corresponding to one nozzle 12A) 20. As shown in the figure, the pressure chamber 22 provided corresponding to the nozzle 12A has a substantially square planar shape, and an outlet to the nozzle 12A is provided at one of the diagonal corners. On the other hand, a supply ink inlet (supply port) 24 is provided. In addition to the above, the shape of the pressure chamber 22 may take various forms such as a square shape (rhombus, rectangle, etc.), a pentagon, a hexagon, other polygons, a circle, and an ellipse.

  The pressure chamber 22 communicates with the flow path 26 through the supply port 24. The flow path 26 communicates with an ink tank (not shown) as an ink supply source, and ink supplied from the ink tank is supplied to the pressure chamber 22 via the flow path 26.

  An actuator 32 having an individual electrode 30 is joined to a pressure plate (vibrating plate also serving as a common electrode) 28 constituting a part of the pressure chamber 22 (the top surface in FIG. 2). By applying a driving voltage between the individual electrode 30 and the common electrode, the actuator 32 is deformed to change the volume of the pressure chamber 22, and an ink droplet is ejected from the nozzle 12 </ b> A due to a pressure change accompanying this. The actuator 32 is preferably a piezoelectric element using a piezoelectric material such as lead zirconate titanate or barium titanate. After the ink is ejected, when the displacement of the actuator 32 is restored, new ink is refilled into the pressure chamber 22 from the flow path 26 through the supply port 24.

  Therefore, in the ink jet recording apparatus 10 according to the present embodiment, by controlling the driving of the actuator 32 corresponding to the nozzle 12A according to the dot arrangement data generated from the image information, it is possible to discharge the droplet from the nozzle 12A. it can.

  FIG. 3 is a diagram illustrating a configuration on the side on which the ink droplets on the transparent substrate 14 are ejected. As shown in the figure, the transparent substrate 14 is divided into a plurality of rectangular droplet ejection regions 42 that are surrounded by a partition wall 40 and formed in a concave shape. The droplet ejection region 42 is a transparent substrate 14. A plurality of them are arranged in a matrix. The droplet ejection area 42 is configured to finally form pixels of the color filter by being filled with ink by the inkjet recording apparatus 10, and the scanning direction is the long side direction, and the direction orthogonal to the scanning direction is the short side. It is considered to be a direction. In the present embodiment, a transparent glass substrate is applied as the transparent substrate 14, but not limited to this, acrylic glass, a plastic substrate, and a plastic film are also applicable. In this embodiment, the thickness of the partition wall 40 is 2 μm, the length of the droplet ejection region 42 in the longitudinal direction is 320 μm, and the length of the droplet ejection region 42 in the short side direction is 90 μm. Is possible. Moreover, in this embodiment, the partition 40 is comprised by resin (for example, black resin) which does not have translucency. As described above, the partition wall 40 is preferably made of a liquid repellent material that repels ink and does not have translucency.

  FIG. 4 is a block diagram showing the main configuration of the electrical system of the inkjet recording apparatus 10 according to the present embodiment. As shown in FIG. 1, the inkjet recording apparatus 10 includes a head 12, a motor 18, a communication interface 50, a system controller 52, an image memory 54, a ROM (Read Only Memory) 56, a motor driver 58, and a print control unit 60. It is configured.

  A communication interface 50, an image memory 54, a ROM 56, a motor driver 58 and a print control unit 60 are connected to the system controller 52.

  The communication interface 50 is an interface unit with the host device 62 that is used when a user gives a drawing instruction or the like to the inkjet recording apparatus 10. As the communication interface 50, a serial interface such as USB (Universal Serial Bus), IEEE 1394, Ethernet (registered trademark), a wireless network, or a parallel interface such as Centronics can be applied. In this part, a buffer memory (not shown) for speeding up communication may be mounted.

  Image information sent from the host device 62 and indicating an image to be formed on the transparent substrate 14 is taken into the inkjet recording apparatus 10 via the communication interface 50 and temporarily stored in the image memory 54. The image memory 54 is a storage unit that stores image information input via the communication interface 50, and data is read and written through the system controller 52. The image memory 54 is not limited to a memory made of a semiconductor element, and a magnetic medium such as a hard disk may be used.

  The system controller 52 includes a CPU (central processing unit) and its peripheral circuits, and functions as a control device that controls the entire inkjet recording apparatus 10 according to a predetermined program, and also functions as an arithmetic device that performs various calculations. . That is, the system controller 52 controls the communication interface 50, the image memory 54, the ROM 56, the motor driver 58, the print control unit 60, and the like, and performs communication control with the host device 62 and read / write control of the image memory 54 and ROM 56. And a control signal for controlling the driving of the motor 18 is generated. In addition to the control signal, image information stored in the image memory 54 is transmitted to the print control unit 60.

  The ROM 56 stores programs executed by the system controller 52 and various data necessary for control. The ROM 56 may be a non-rewritable storage means. However, when various data are updated as necessary, it is preferable to use a rewritable storage means such as an EEPROM.

  The image memory 54 is used as a temporary storage area for image information, and is also used as a program development area and a calculation work area for the system controller 52.

  The motor driver 58 is a driver (drive circuit) that drives the motor 18 in accordance with an instruction from the system controller 52. The print control unit 60 functions as a signal processing unit that performs various processes such as processing and correction for generating a discharge control signal from image information transmitted from the system controller 52 according to the control of the system controller 52. The ejection drive of the head 12 is controlled based on the generated droplet ejection data.

  Next, the color filter manufacturing process will be described.

  The production of the color filter is performed along the following steps 1 to 4.

Step 1: Fill all the droplet ejection regions 42 with ink to form an ink reservoir in each droplet ejection region 42.

Step 2: The ink reservoir in the droplet ejection area 42 is dried (hereinafter also referred to as “pre-baking”).

Step 3: Light is irradiated to the ink reservoir in the droplet ejection area 42.

Step 4: The transparent substrate 14 is fired (hereinafter also referred to as “post-bake”).

  First, step 1 (a step of filling all the droplet ejection regions 42 with ink and forming an ink reservoir in each droplet ejection region 42) will be described.

  In the inkjet recording apparatus 10 according to the present embodiment, when an instruction to start production of a color filter is input, first, for each droplet ejection region 42 on the transparent substrate 14, in order to form a pixel of the color filter, A droplet ejection control process for ejecting ink droplets is performed so that an ink reservoir is formed in each droplet ejection region 42.

  Hereinafter, the operation of the inkjet recording apparatus 10 when the droplet ejection control process is executed will be described with reference to FIG. FIG. 5 is a flowchart showing the flow of the droplet ejection control processing program executed by the system controller 52 at that time, and the program is stored in a predetermined area of the ROM 56 in advance.

  In step 100 in the figure, the motor 18 is driven so that the head 12 moves along a predetermined path at a predetermined speed. In the next step 102, the process waits until the nozzle 12 </ b> A reaches the high-sensitivity ink droplet ejection start position (here, the position facing the droplet ejection area 42 where no high-sensitivity ink is ejected), and then the process proceeds to step 104. Then, the head 12 is controlled to eject high-sensitivity ink as ink droplets from the nozzle 12A.

  In the next step 106, the process waits until the number of droplets of high-sensitivity ink reaches a predetermined number (here, the number of droplets that causes the high-sensitivity ink to be in the state shown in FIG. 6 as an example in the droplet ejection region 42). Thereafter, the process proceeds to step 108, and the head 12 is controlled so as to stop the discharge of the high sensitivity ink. As a result, the head 12 stops discharging high-sensitivity ink.

  In the next step 110, it is determined whether or not the processing of steps 104 to 108 has been executed for all droplet ejection regions 42. If a negative determination is made, the process returns to step 102, whereas if an affirmative determination is made. Goes to step 112.

  In step 112, the process waits until a predetermined time has elapsed (here, the time until the high-sensitivity ink in the droplet ejection area 42 is dried and the state shown in FIG. 7 is taken as an example). As a result, the solvent of the high-sensitivity ink filled in the droplet ejection region 42 evaporates to some extent, so that the concentration of the photopolymerization initiator of the high-sensitivity ink and the low-sensitivity ink does not become uniform even if the low-sensitivity ink is overfilled later. . In this embodiment, the solvent of the high-sensitivity ink filled in the droplet ejection area 42 is evaporated by natural drying. However, the present invention is not limited to this, and forced drying is performed using a hot plate or a furnace. May be.

  In the next step 114, the process waits until the nozzle 12 </ b> A reaches the low-sensitivity ink droplet ejection start position (here, the position facing the droplet ejection area 42 where the low-sensitivity ink is not ejected), and then proceeds to step 116. Then, the head 12 is controlled to eject low-sensitivity ink as ink droplets from the nozzle 12A.

  In the next step 118, the process waits until the number of droplets of low-sensitivity ink reaches a predetermined number (here, the number of droplets that causes the low-sensitivity ink to be in the state shown in FIG. 8 as an example in the droplet ejection region 42). Thereafter, the process proceeds to step 120 where the head 12 is controlled so as to stop the discharge of the low sensitivity ink. As a result, the head 12 stops discharging the low-sensitivity ink.

  In the next step 122, it is determined whether or not the processing of steps 116 to 120 has been executed for all the droplet ejection regions 42. If a negative determination is made, the process returns to step 102, whereas if an affirmative determination is made. Ends the droplet ejection control processing program.

  As described above, when the droplet ejection control processing program is executed by the system controller 52, all the droplet ejection regions 42 have a high sensitivity ink layer 65A and a low sensitivity ink layer 65B as shown in FIG. A laminated body 65 is formed as an ink reservoir.

  Thus, after the laminated body 65 is formed in all the droplet ejection regions 42, the above-described step 2 is performed. In step 2, the transparent substrate 14 including the laminated body 65 formed in all the droplet ejection regions 42 is left in an atmosphere having a temperature of 100 to 130 ° C. for several minutes to evaporate most of the ink solvent. In the present embodiment, the pre-baking in step 2 and the post-baking in step 4 are performed in an atmospheric oven, but the present invention is not limited to this, and may be performed in a nitrogen replacement oven, a hot plate, or the like.

  In the next step 3, the laminated body 65 of the transparent substrate 14 is irradiated with ultraviolet rays from above. As a result, the polymerization and crosslinking of the monomers contained in the ink proceed and the laminate 65 is cured. At this time, curing of the high sensitivity ink layer 65A is promoted more than the low sensitivity ink layer 65B.

  In the next step 4, the transparent substrate 14 including the laminated body 65 formed in all the droplet ejection regions 42 is baked by leaving it in an atmosphere having a temperature of 200 to 230 ° C. for about 30 minutes. At this time, since the curing of the high-sensitivity ink layer 65A positioned below the low-sensitivity ink layer 65B proceeds more than the curing of the low-sensitivity ink layer 65B, the upper surface of the stacked body 65 (the upper surface of the low-sensitivity ink layer 65B). ) Is less likely to cause wrinkles.

  In addition, by manufacturing a color filter using both photocuring and thermal curing as described above, the curability of the ink reservoir (laminate 65) constituting each pixel is increased, and the chemical resistance, heat resistance, and light resistance are increased. And weather resistance can be improved. In particular, an ink using a dye as in this embodiment may be inferior in chemical resistance to an ink using a pigment, and therefore it is effective to use photocuring and heat curing in combination.

  As described above in detail, according to the method for manufacturing a color filter according to the present embodiment, the curing rate is increased in the layer unit from the lower layer to the upper layer in the droplet ejection region 42 surrounded by the partition 40 on the transparent substrate 14. A specific energy (in this case, light energy by ultraviolet rays) is formed so that a laminate 65 is formed by laminating ink liquid layers (here, high-sensitivity ink layer 65A and low-sensitivity ink layer 65B) so as to be gradually slowed down. Since the ink which is cured by reaction is filled, the curing of the lower ink liquid layer (here, the high sensitivity ink layer 65A) is advanced than the upper ink liquid layer (here, the low sensitivity ink layer 65B). As a result, the occurrence of wrinkles on the upper surface of the ink reservoir (here, the upper surface of the laminate 65) can be suppressed without causing a significant decrease in productivity.

  Further, according to the method for producing a color filter according to the present embodiment, the ink contains a curing accelerator (here, a photopolymerization initiator) that accelerates curing in response to specific energy, and is a laminate. 65 is configured by laminating the ink liquid layer so that the content of the curing accelerator gradually decreases in units of layers from the lower layer to the upper layer, so that the lower layer ink is easier than the upper ink liquid layer. Curing of the liquid layer can proceed.

  In addition, according to the method for manufacturing a color filter according to the present embodiment, the droplet ejection region 42 is formed in a rectangular shape, and a plurality of droplet ejection regions 42 are arranged in a matrix on the transparent substrate 14. Since the ink is filled so that 65 is formed, a color filter having a uniform ink distribution can be manufactured.

  In addition, according to the color filter manufacturing method of the present embodiment, the partition 40 is made of a liquid repellent material that repels ink, so that the ink passes over the partition 40 and flows out of the droplet ejection region 42. Can be suppressed.

  In the above embodiment, a single nozzle 12A ejects a plurality of ink droplets onto the droplet ejection area 42. However, the present invention is not limited to this, and as shown in FIG. Alternatively, the line head 70 having a plurality of nozzles 70A for discharging the ink may be tilted by a fixed angle θ that is not orthogonal to the scanning direction to perform one-pass scanning on the droplet ejection region 42. This can improve productivity.

  In the above embodiment, the case where each of the high-sensitivity ink and the low-sensitivity ink contains the compound (1) as a photopolymerization initiator has been described, but the present invention is not limited to this, As the photopolymerization initiator contained in the sensitivity ink, a compound having higher reactivity than the compound (1) may be applied instead of the compound (1). In addition, the following compound (3) can be illustrated as a compound with higher reactivity than a compound (1) as a photoinitiator.

また、上記実施形態では、感光波長域を広げて、光エネルギーを有効に利用することにより光重合開始剤の感度を高める化合物からなる光増感剤をインクに含有させてもよい。この場合、低感度インクよりも高感度インクにより多くの光増感剤を含有させる。光増感剤としては、ベンゾフェノン、アセトフェノン、チオキトサンなどが例示できる。

Moreover, in the said embodiment, you may make the ink contain the photosensitizer which consists of a compound which expands the photosensitive wavelength range and improves the sensitivity of a photoinitiator by using optical energy effectively. In this case, more photosensitizer is contained in the high-sensitivity ink than in the low-sensitivity ink. Examples of the photosensitizer include benzophenone, acetophenone, thiochitosan and the like.

  In the above embodiment, the case where the ink contains a photopolymerization initiator has been described. However, the present invention is not limited to this, and the ink is at least one of a photopolymerization initiator and a thermal polymerization initiator. As long as one is contained. When a thermal polymerization initiator is used, more thermal polymerization initiator is contained in the high sensitivity ink than in the low sensitivity ink. By using the thermal polymerization initiator in this way, it is possible to promote the ink polymerization reaction during pre-baking and post-baking. Examples of the thermal polymerization initiator include organic peroxides typified by benzoyl peroxide (BPO) and azo compounds typified by azobisisobutyronitrile (AIBN).

  Further, in the above-described embodiment, the description has been given of the form example in the case where the stacked body 65 is configured by two layers of the high-sensitivity ink layer 65A and the low-sensitivity ink layer 65B, but the present invention is not limited to this. It is good also as a laminated body of three or more layers. In this case, it is set as the laminated body which laminated | stacked the ink layer so that a cure rate may become slow gradually in a layer unit from a lower layer toward an upper layer. Thereby, the effect similar to the said embodiment or more can be anticipated.

  Further, in the above-described embodiment, the description has been given by taking the form example in the case of ejecting ink droplets from the head 12 while moving the head 12 relative to the transparent substrate 14, but the present invention is not limited to this. For example, ink droplets may be ejected from the head 12 while moving the transparent substrate 14 relative to the head 12, or ink droplets may be ejected from the head 12 while moving both the head 12 and the transparent substrate 14. Good. In this way, ink droplets may be ejected from the head 12 while relatively moving at least one of the head 12 and the transparent substrate 14.

  In the above embodiment, the case where the color filter is manufactured by ejecting ink droplets onto the transparent substrate 14 has been described. However, the present invention is not limited to this, and the recording medium may be a sheet, a plate material, or a sheet material. The image may be recorded by filling the droplet ejection area of the recording medium with the ink filling method of the present invention.

10 Inkjet recording device 12 Head 14 Transparent substrate (recording medium)
40 Bulkhead 42 Dropping area (area)
52 System Controller 65 Laminate 65A High Sensitivity Ink Layer (Lower Layer)
65B Low sensitivity ink layer (upper layer)

Claims (7)

In the region surrounded by the partition on the medium on which the ink liquid is ejected , the curing sensitivity gradually decreases in units of layers from the lower layer to the upper layer, and the content of the curing accelerator is in units of layers from the lower layer to the upper layer. An ink liquid filling method of filling an ink liquid that is cured in response to specific energy so as to form a laminated body in which a plurality of ink liquid layers that gradually decrease in step are formed . The ink liquid, light curing accelerator to accelerate the curing in response to light energy, and ink of claim 1, wherein which contains at least one of the heat curing accelerator to promote the reaction to cure the heat energy Filling method. The ink liquid filling method according to claim 1, wherein the ink liquid contains a photosensitizer that causes photosensitization in response to light energy. 4. The method according to claim 1, wherein the region is rectangular, the plurality of regions are arranged in a matrix on the medium , and the ink liquid is filled so that the stacked body is formed in each region. The ink liquid filling method according to claim 1.   The ink liquid filling method according to any one of claims 1 to 4, wherein the partition wall is made of a liquid repellent material that repels ink liquid. A color filter manufacturing method using the ink liquid filling method according to claim 1, wherein the medium is a transparent substrate. Filling an ink liquid containing a photocuring accelerator that accelerates curing in response to light energy into a region surrounded by a partition on a transparent substrate;
Removing the solvent of the ink liquid filled in the region;
Filling the region with an ink liquid having a lower photocuring accelerator content and a lower curing sensitivity than the previously filled ink liquid, overlaid on the previously filled ink liquid;
Drying the ink liquid filled in the region;
Applying the light energy to the ink liquid filled in the region;
Baking the transparent substrate including the ink liquid filled in the region;
A color filter manufacturing method comprising:

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