JP2008155180A - Application needle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an application needle on which the drying and fixing of ink is prevented and by which the fluidity and transferring property of ink are enhanced when used for applying ink. <P>SOLUTION: The application needle 1 is used for applying a liquid material to a substrate while bringing the tip of the application needle 1 into contact with a minute area on the substrate. A water-repellent layer 5 containing a resin base stock having water repellency is formed on at least a part of the surface of the application needle. Since a water-repellent layer 5-formed portion has strong water repellency, the drying and fixing of ink can be prevented and the fluidity of ink on the surface of the application needle 1 can be enhanced. When ink is transferred to the object such as the substrate to be coated, such a function of the application needle can be enhanced that a fixed amount of ink is poured. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an application needle, and more particularly, to an application needle for applying a liquid material to a substrate by bringing the tip into contact with a fine region on the substrate such as a color filter for a liquid crystal display.

  In recent years, with the increase in size and resolution of LCDs (Liquid Crystal Displays, liquid crystal displays), the number of pixels has increased, making it difficult to manufacture LCDs without defects and increasing the probability of occurrence of defects. Under these circumstances, in order to improve the yield, a defect correction apparatus that converts non-defective products by correcting defects generated in the manufacturing process of the color filter of the LCD is indispensable for the production line.

  Recently, LCDs having a size of about 37 to 45 inches are commercially available, and the size of one pixel has increased from about 60 μm × 200 μm to about 200 μm × 600 μm of a small panel. As the pixel size increases, the defect size also increases and the correction size also increases. In such a situation, even a correction quality that was not a problem with a conventional small correction size may become a problem because it becomes an area that can be seen with a large correction size.

  FIGS. 9A to 9C are diagrams showing defects that occur in the manufacturing process of the color filter of the LCD. As shown in FIGS. 9A to 9C, the color filter includes a transparent substrate, a lattice pattern called a black matrix 300 formed on the surface thereof, and a plurality of sets of R (red) pixels 301, G. (Green) pixel 302 and B (blue) pixel 303. In the manufacturing process of the color filter, the white defect 304 in which the color of the pixel or the black matrix 300 is lost as shown in FIG. 9A, or the color of the adjacent pixel is mixed as shown in FIG. 9B. Or a black defect 305 in which the black matrix 300 protrudes from the pixel, or a foreign substance defect 306 in which a foreign substance adheres to the pixel as shown in FIG.

  In an inspection / correction process for applying color ink, such as correction of a defect in a color filter, color correction using an application needle is the mainstream. As a method for correcting the white defect 304, ink having the same color as that of the pixel in which the white defect 304 is present is attached to the tip of the application needle, and the ink layer on the circular flat surface at the tip of the needle is transferred to the white defect 304. There is a method of covering the white defect 304 with an ink layer. Further, as a method of correcting the black defect 305 and the foreign matter defect 306, the defective portion is laser-cut to form a rectangular white defect 304, and the rectangular white defect 304 is formed using a coating needle having a rectangular tip flat surface. There is a method of transferring a rectangular ink layer.

In the inspection / correction process for applying colored inks, the three primary colors of red, green, blue, and black are applied using a single needle. After washing the needle, different colors are applied. The flow is to select and apply. Alternatively, the cleaning operation may be omitted by using a total of four needles for each color. For example, Patent Document 1 proposes an application technique using an application needle. In addition, for the purpose of stabilizing the amount of ink and cleaning liquid adhering to the coating needle so as not to exceed a predetermined amount and improving the cleaning performance, a technique in which the coating needle is subjected to water repellent processing by nickel plating has been proposed. (For example, refer to Patent Document 2).
JP-A-8-292442 JP 2004-205912 A

  The ink used for correcting the defect of the color filter has a strong fixing power. That is, the ink attached to the application needle for application to the substrate is easily fixed to the application needle. If immersion of the application needle in the ink having strong fixability is repeated, even if the application needle is washed each time, the partially dried ink tends to adhere to the outer peripheral portion of the application needle.

  In the color filter defect correction, the color correction is performed assuming that the diameter of the tip of the coating needle approximates the diameter of the ink to be transferred. However, when the dried ink adheres to the tip of the application needle, a desired application diameter cannot be obtained. If excessive ink adheres to the periphery of the tip of the application needle, more ink than necessary may adhere to the application needle when the application needle is immersed in the ink, resulting in an abnormal ink transfer state thereafter.

  Therefore, a main object of the present invention is to provide an application needle that prevents the ink from drying and sticking and improves the fluidity and transferability of the ink when the ink is applied.

  An application needle according to the present invention is an application needle for applying a liquid material to a substrate by bringing the tip into contact with a fine region on the substrate, and a water repellent containing a water-repellent resin material on at least a part of the surface. A processed layer is formed. In this case, strong water repellency is obtained in the portion where the water repellent layer is formed, and thus it is possible to prevent the ink from being dried and fixed. In addition, the fluidity of the ink on the surface of the application needle is increased, and the function of pouring a certain amount of ink is enhanced at the time of ink transfer to an application target such as a substrate. The water repellency refers to the property of repelling water and can be evaluated by the contact angle of water droplets measured using a contact angle meter. If the contact angle (water repellency) of the resin material is 80 ° or more, it can be suitably used as the water-repellent layer of the application needle of the present invention.

  Preferably, the water-repellent layer is a layer obtained by impregnating or coating a metal material of a coating needle with a resin material. In this case, the water-repellent layer can be formed on the surface of the application needle by impregnating or coating the metal material of the application needle such as iron with a resin material.

  Preferably, a resin material is used as the material of the application needle. In this case, a water repellent layer can be formed on the surface of the application needle by using a resin material as the material of the application needle itself and integrally processing it.

  Preferably, the resin material has corrosion resistance. In this case, for example, corrosion of the application needle due to the influence of a cleaning liquid that is an organic solvent can be prevented, and the life of the application needle can be extended. Corrosion resistance refers to resistance to corrosion of materials, in particular, difficulty in deterioration, alteration, and decomposition in chemicals such as solvents. Corrosion resistance is evaluated based on, for example, the absence of surface corrosion and rusting of the base material after the evaluation material is immersed in a solvent such as ethanol or PEGMA (polyethylene glycol methacrylol) in addition to the ink, for example, for 24 hours. be able to.

  Preferably, the resin material is a fluororesin. In this case, by forming a water-repellent layer on the surface of the application needle with a fluorine-based resin having excellent water repellency and corrosion resistance, the ink is prevented from drying and adhering to the application needle. Fluidity and transferability can be improved. In addition, the life of the application needle can be extended. For example, polytetrafluoroethylene (PTFE), tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (PFA), or the like can be used as the fluororesin.

  As described above, according to the application needle of the present invention, it is possible to prevent the ink from drying and adhering to the application needle, and to improve the fluidity and transferability of the ink when applying the ink.

  Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a schematic view of an application needle according to Embodiment 1 of the present invention. As shown in FIG. 1, in the application needle 1, the cross-sectional area of the application needle 1 from the front end to the base end of the application needle 1 is extended at the distal end over a length that is not affected by the surface tension of the ink. A taper portion 2 that gradually expands is provided. A flat surface 3 is provided at the tip of the application needle 1. By providing the tapered portion 2 and the flat surface 3 at the tip portion, when the application needle 1 immersed in the ink tank in order to attach ink to the application needle 1 is pulled up from the ink tank, the upper portion of the taper portion 2 is caused by surface tension. Ink pool is generated in the surface, and the flat surface 3 and its vicinity are covered with a thin ink layer. The amount of ink held by the application needle 1 can be adjusted by controlling the immersion depth of the application needle 1 in the ink tank.

  When applying ink to the surface of the substrate using the application needle 1, the flat surface 3 at the tip of the application needle 1 with ink attached to the tip is brought into contact with and held at a predetermined position on the surface of the substrate. At this time, even if the contact holding time between the application needle 1 and the substrate is increased, the amount of ink flowing out to the contact portion between the application needle 1 and the substrate hardly changes. That is, since the surface tension of the ink adhering to the taper portion 2 is strong, the ink adhering to the ink reservoir above the taper portion 2 is held as it is and does not flow into the substrate. Therefore, it is possible to transfer an amount of ink attached to the flat surface 3 to a transfer object such as a substrate.

  When the flat surface 3 at the tip of the application needle 1 is brought into contact with the substrate, the ink adhering to the flat surface 3 is pushed out to the outer periphery of the flat surface 3 and slightly spreads, and is transferred and applied to a predetermined position on the surface of the substrate. For example, when the application needle 1 having a flat surface 3 of φ50 μm is used, the diameter of the transferred ink is about φ60 μm. In this way, it is possible to obtain a desired ink correction size by controlling the dimensions of the flat surface 3 at the tip of the application needle 1. The flat surface 3 is circular in FIG. 1, and its diameter is preferably, for example, about 20 μm or more and 70 μm or less. The planar shape of the flat surface 3 is not limited to a circle, but may be a polygon such as a quadrangle or a triangle. The tip of the application needle 1 does not necessarily have to be flat, and may be anything such as a convex shape or a concave shape.

  Further, as shown in FIG. 1, a water repellent layer 5 is formed on the surface of the application needle 1. The water repellent layer 5 includes a resin material having water repellency, and is formed without a break so as to surround the entire surface of the application needle 1. The water repellent layer 5 can be formed by impregnating the metal material of the application needle 1 with a resin material. For example, NIDAX (R) treatment in which a porous porous nickel film deposited on the surface of iron or stainless steel is impregnated with fluororesin, or a hard alumite film formed on the surface of aluminum or aluminum alloy is impregnated with fluororesin (R) Processing can be performed. The water repellent layer 5 can be formed by coating the metal material of the application needle 1 with a resin material. As the resin material, for example, a resin material having corrosion resistance such as a fluorine resin and a silicone resin is suitable.

  For the purpose of application to a soft surface, the water repellent layer 5 can be formed up to the flat surface 3 at the tip of the application needle 1 as shown in FIG. Depending on the application, as shown in FIG. 2, the water-repellent layer 5 may be formed on the tapered portion 2 without forming the water-repellent layer 5 on the cylindrical portion of the application needle 1. That is, there is no restriction on the target surface or portion of the application needle that is impregnated or coated with the resin material to form the water repellent layer, and the water repellent layer 5 is formed on at least a part of the surface of the application needle 1. That's fine.

  When the water repellent layer 5 is formed by coating the resin material, if the resin material becomes too thick, the surface pressure applied to the flat surface 3 when the flat surface 3 at the tip of the application needle 1 contacts the object to be corrected. Since the resin material is elastically deformed and spreads, the ink may protrude beyond the defect to be corrected. If the resin material is too thin, problems such as peeling of the coating and early wear may occur. Accordingly, the coating thickness is 5 μm or more and 30 μm or less, and the ink application diameter can be optimized by properly using the coating thickness depending on the surface hardness and material of the object to be corrected.

  FIG. 3 is a partially omitted perspective view showing a configuration of an ink application mechanism for applying ink using the application needle 1 shown in FIG. 1 or FIG. As shown in FIG. 3, the ink application mechanism 21 includes an application needle 1 for applying ink. Further, the application needle 1 is driven vertically so that the tip of the application needle 1 contacts the liquid material in the container holding the liquid material, and the tip of the application needle 1 is closer to the substrate than the standby position. And an application needle drive cylinder 22 as a drive unit for stopping the tip of the application needle 1 at least at two positions. The application needle 1 is provided at the distal end portion of the drive shaft 23 of the application needle drive cylinder 22 via the holding member 24.

  The ink application mechanism 21 includes a rotary table 25 provided horizontally. A plurality of ink tanks 28 to 31 as containers for holding a liquid material are sequentially arranged on the rotary table 25 in the circumferential direction, and a cleaning device 32 and an air purge device 33 are provided on the rotary table 25. It is done. A rotating shaft 26 is erected at the center of the rotary table 25. Further, the rotary table 25 is formed with a notch 27 for allowing the needle 1 to pass through when applying ink. Ink tanks 28 to 31 are each appropriately filled with R (red), G (green), B (blue), and black ink. The cleaning device 32 is for removing ink attached to the application needle 1, and the air purge device 33 is for blowing off the cleaning liquid attached to the application needle 1.

  The ink application mechanism 21 also includes an index motor 34 for rotating the rotary shaft 26 of the rotary table 25. Further, the index plate 35 that rotates together with the rotary shaft 26, the index sensor 36 for detecting the rotational position of the rotary table 25 by the index plate 35, and the rotational position of the rotary table 25 returned to the origin by the index plate 35. And an origin return sensor 37 for detecting. The motor 34 is controlled based on the outputs of the index sensor 36 and the origin return sensor 37, and rotates the rotary table 25 so that any one of the notch 27, the ink tanks 28 to 31, the cleaning device 32, and the air purge device 33 is rotated. It is located below the application needle 1.

  The application needle drive cylinder 22 and the motor 34 are fixed to a Z-axis table (not shown), and the Z-axis table and the color filter substrate to be subjected to defect correction are an XY table (not shown) below the application needle 1. )).

  Next, the operation of the ink application mechanism 21 will be described. First, the XY table and the Z-axis table are driven, and the tip of the application needle 1 is positioned at a predetermined position above the defective portion of the color filter substrate. Next, the rotary table 25 is rotated by the motor 34, and a desired ink tank (for example, 28) is moved below the application needle 1. Next, the application needle 1 is driven up and down by the application needle drive cylinder 22, and ink is attached to the tip of the application needle 1.

  Next, the rotary table 25 is rotated by the motor 34, and the notch 27 is moved below the application needle 1. Next, the application needle 1 is driven up and down by the application needle driving cylinder 22, and the ink adhering to the tip of the application needle 1 is applied to the defective portion of the color filter substrate.

  When cleaning the application needle 1, the rotary table 25 is rotated by the motor 34, and the cleaning device 32 is moved below the application needle 1. Next, the application needle 1 is driven up and down by the application needle driving cylinder 22 to wash the ink adhering to the application needle 1. Next, the rotary table 25 is rotated by the motor 34, and the air purge device 33 is moved below the application needle 1. Next, the application needle 1 is driven up and down by the application needle drive cylinder 22, and the cleaning liquid adhering to the application needle 1 is blown off.

  FIG. 4 is a diagram showing an overall configuration of a defect correcting apparatus equipped with the ink application mechanism 21 shown in FIG. As shown in FIG. 4, the defect correction apparatus includes a defect correction head unit including an observation optical system 40, a CCD camera 41, a laser 42, an ink application mechanism 21, and an ink curing illumination 43. In addition, a positioning mechanism is provided that performs positioning by relatively moving the defect correction head unit and the substrate table. The positioning mechanism includes a Z-axis table 44 as a first sub-driving unit that moves the defect correction head unit in a direction perpendicular to the substrate 6 (Z-axis direction), and a Z-axis table 44 mounted on the Y-axis direction. An X-axis table 45 as a second sub-driving unit that moves in the X-axis direction orthogonal to and substantially parallel to the substrate, and a substrate table for mounting the substrate 6 and moving in the Y-axis direction substantially parallel to the substrate And a Y-axis table 46. Further, a control computer 47 for controlling the operation of the entire apparatus and an operation panel 48 for inputting a command from the operator to the control computer 47 are provided.

  The observation optical system 40 is for observing the surface state of the substrate 6 (including defective portions on the surface of the substrate 6) and the state where ink is applied by the ink application mechanism 21. An image observed by the observation optical system 40 is converted into an electrical signal by the CCD camera 41 and displayed on the monitor screen of the control computer 47. The ink curing illumination 43 irradiates light for curing the ink applied by the ink application mechanism 21. When the ink is of an ultraviolet curing type, the ultraviolet illumination is selected as the ink curing illumination 43 and mounted on the apparatus. When the ink is of a thermosetting type, the halogen illumination is selected as the ink curing illumination 43 and mounted on the apparatus. The laser 42 is used for irradiating a black defect or a foreign matter defect with laser light to remove it. With this apparatus configuration, the ink adhering to the tip of the application needle 1 can be applied and corrected in a hole in which a white defect, or a black defect or a foreign substance defect has been removed by the laser 42, and the white color generated in the color filter can be corrected. Defects, black defects, and foreign object defects can be corrected.

  As described above, the application needle 1 according to this embodiment is applied to a use in which a liquid material such as ink is applied to a defect generated in a manufacturing process such as an LCD color filter or a printed circuit board. be able to. The application needle 1 is for applying a liquid material to a substrate by bringing its tip into contact with a fine region such as a defect generated on the substrate. Then, by impregnating or coating the metal material of the application needle 1 with a resin material having water repellency and corrosion resistance, such as a fluorine resin, on at least a part of the surface of the application needle 1, the water repellent layer 5 is formed. It is formed.

  As a result, the water-repellent layer 5 is formed on the portion of the applicator needle 1 where the ink adheres, so that strong water repellency can be obtained. Even if the applicator needle 1 is immersed in the ink tank, the applicator needle 1 Since the ink can be prevented from being dried and fixed, a stable ink application diameter can be obtained. In the ink application mechanism 21 shown in FIG. 3, since the application needle 1 is used in common for each color, the application needle 1 must be washed when the ink color to be applied is changed. As the water performance increases, the cleaning time can be shortened. By using a resin material having corrosion resistance, for example, corrosion of the application needle 1 due to the influence of a cleaning liquid that is an organic solvent can be prevented, and the life of the application needle 1 can be extended.

(Embodiment 2)
FIG. 5 is a schematic diagram of the application needle of the second embodiment. As shown in FIG. 5, in this application needle 71, the cross-sectional area of the application needle 71 extends from the tip of the application needle 71 to the base end over a length that is not affected by the surface tension of the ink. A taper portion 72 that gradually expands is provided. A flat surface 73 is provided at the tip of the application needle 71.

  In FIG. 5, a resin material is used as the material of the application needle 71 itself, the application needle 71 is integrally processed, and the entire application needle 71 is formed of a resin material. Therefore, the resin material appears on the entire surface of the application needle 71, and the water repellent layer 75 including the resin material having water repellency is formed on the entire surface of the application needle 71. With this configuration, strong water repellency can be obtained on the entire surface of the application needle 71, so that it is possible to prevent the ink from drying and adhering to the surface of the application needle 71. The application needle 71 of the second embodiment is used for correcting defects in LED color filters, and is a thin glass substrate such as a liquid crystal substrate, a thick glass substrate for plasma display, a resin system such as a hard plastic printed substrate, and a film liquid crystal. It is suitably used for correction applications such as soft materials, and can be used for a wide range of applications and has high expandability.

(Embodiment 3)
FIG. 6 is a schematic diagram of the application needle of the third embodiment. 6 (a) is a front view showing the tip of the application needle 81, FIG. 6 (b) is a bottom view thereof, FIG. 6 (c) is an enlarged view of a portion A in FIG. FIG. 4D is a cross-sectional view taken along the line VID-VID in FIG. 4A, and FIG. 4E is an enlarged view of a portion B in FIG.

  As shown in FIGS. 6A to 6E, the tip of the application needle 81 is applied from the tip of the application needle 81 toward the base end over a length that is not affected by the surface tension of the ink. A taper portion 82 where the cross-sectional area of the needle 81 gradually increases is provided, a flat surface 83 is provided at the tip of the application needle 81, and the outer peripheral surface of the tip portion of the application needle 81 is provided with a taper portion 82 from the tip. A groove 84 having a predetermined dimension is formed over the upper portion.

  Thus, by providing the tapered portion 82, the flat surface 83, and the groove 84 at the tip portion, when the application needle 81 is pulled up from the ink tank, an ink pool is generated in the upper portion of the tapered portion 82 due to the surface tension, and the flat surface. 83 and its vicinity are covered with a thin ink layer, and ink accumulates in the groove 84. When the flat surface 83 at the tip of the application needle 81 is brought into contact with the substrate surface, the ink adheres to the substrate surface, resulting in an imbalance in surface tension, and the ink accumulated in the upper portion of the taper portion 82 or in the groove 84 is capillary action. Is supplied to the tip via the groove 84 and applied to the substrate. For example, when ink is applied to the white defect of the color filter, the ink can be accurately and easily applied to the entire white defect by bringing the tip of the application needle 81 into contact with the center of the white defect.

  As shown in FIG. 6, a water repellent layer 85 containing a water-repellent resin material is formed on the entire surface of the application needle 81. In the portion where the water repellent layer 85 is formed, strong water repellency is obtained, so that the fluidity of the ink is increased. Therefore, when the flat surface 83 is brought into contact with the substrate surface, the filling function that the ink adhering to the outer peripheral portion of the application needle 81 easily flows into the substrate is enhanced. Therefore, the application needle 81 of this embodiment can be suitably used for correction applications such as correction of large defective portions and filling of holes with ink.

  As shown in FIG. 6, the groove 4 may penetrate to the flat surface 83, but the flat surface 83 at the tip of the application needle 81 contacts the substrate surface, and the ink adhering to the flat surface 83 is pushed out to the outer periphery. If it is formed to a position where the pushed ink and the ink stored in the groove 84 are sufficiently connected, the flat surface 83 may not be penetrated. Further, the cross-sectional shape of the groove 84 may be a quadrangle as shown in FIG. 6, but may be a semicircular shape or a wedge shape, or any shape.

  Further, the number of the grooves 84 may be one as shown in FIG. 6, or two or more. As the number of the grooves 84 increases, the amount of ink stored in the grooves 84 increases, so the amount of ink that flows out to the contact portion between the application needle 81 and the substrate increases. In addition, a large amount of ink can flow out in a shorter time, and the correction time can be shortened.

  Further, the width of the groove 84 may be the same over the entire length of the groove 84 as shown in FIG. 6, but it may be gradually widened from the distal end of the application needle 81 toward the proximal end. A polygonal wide portion may be formed, and a circular wide portion may be formed at the center of the groove 84. When the width of the groove 84 is increased, the volume of the groove 84 can be increased, and the same effect as when the number of the grooves 84 is increased can be obtained. In the method of increasing the number of grooves 84, the number of grooves 84 is limited when the tip diameter of the application needle 81 is small. In that case, the amount of ink stored in one groove 84 can be increased by increasing the width of the groove 84 above the tip of the application needle 81.

(Embodiment 4)
FIG. 7 is a schematic diagram of the application needle of the fourth embodiment. FIG. 7 (a) is a side view showing the tip of the application needle 91, FIG. 7 (b) is a front view thereof, FIG. 7 (c) is a bottom view thereof, and FIG. It is the VIID-VIID sectional view taken on the line of Drawing (b), the figure (e) is the VIIE-VIIE sectional view of the figure (b), the figure (f) is the VIIF-VIIF of the figure (b). It is line sectional drawing.

  As shown in FIG. 7, at the tip of the application needle 91, the cross-sectional area of the application needle 1 gradually increases from the tip of the application needle 91 to the base end over a length that is not affected by the surface tension of the ink. A taper portion 92 that expands is provided, a flat surface 93 is provided at the tip of the application needle 91, and a flat surface 94 having a predetermined dimension extends from the tip to the top of the taper portion 92 on the outer peripheral surface of the taper portion 92. Is formed.

  By providing the tapered portion 92 and the flat surfaces 93 and 94 at the tip portion in this way, when the application needle 91 is pulled up from the ink tank, an ink pool is generated on the upper portion of the tapered portion 92 due to surface tension, and the tip is flat. Surface 93 and its vicinity are covered with a thin ink layer. Due to the surface tension of the ink, more ink is held on the flat surface 94 of the tapered portion 92 than on the outer peripheral surface other than the flat surface 94. Note that the amount of ink held on the flat surface 94 increases as the ink viscosity increases, and decreases when the ink viscosity is low. Further, the amount of ink held by the application needle 91 can also be adjusted by controlling the immersion depth of the application needle 91 in the ink tank.

  When the flat surface 93 at the tip of the application needle 91 is brought into contact with the substrate surface, the ink adheres to the substrate surface, resulting in an imbalance in surface tension, and the ink held on the upper portion of the taper portion 92 and the flat surface 94. Is supplied to the contact portion between the flat surface 93 at the tip and the substrate, and applied to the substrate.

  As shown in FIG. 7, a water repellent layer 95 including a resin material having water repellency is formed on the surface of the application needle 91. In the portion where the water-repellent layer 95 is formed, strong water repellency is obtained, so that the fluidity of the ink is increased. Therefore, when the flat surface 93 is brought into contact with the substrate surface, the filling function that the ink adhering to the outer peripheral portion of the application needle 91 easily flows into the substrate is enhanced. Therefore, the application needle 91 according to this embodiment can be suitably used for correction such as correction of a large defect portion or filling of a hole with ink.

  In FIG. 7, four flat surfaces 94 are provided on the outer peripheral surface of the taper portion 92 and the flat surface 93 at the tip is a quadrangle, but the number of flat surfaces 94 can be arbitrarily determined. For example, as shown in FIG. 8, three flat surfaces 94 may be provided. When three flat surfaces 94 are provided, the flat surface 93 at the tip becomes a triangle. The application needle 91 can be formed such that the dimensions of each side of the quadrangle or triangle formed by the flat surface at the tip are, for example, about 20 μm or more and 50 μm or less.

  The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a schematic diagram of the application needle | hook of Embodiment 1 of this invention. FIG. 6 is a schematic diagram showing a modification of the application needle of the first embodiment. It is a perspective view which shows the structure of an ink application | coating mechanism. It is a figure which shows the whole structure of a defect correction apparatus. 6 is a schematic diagram of an application needle according to Embodiment 2. FIG. 6 is a schematic diagram of an application needle according to Embodiment 3. FIG. FIG. 6 is a schematic diagram of an application needle of a fourth embodiment. FIG. 10 is a schematic diagram showing a modification of the application needle of the fourth embodiment. It is a figure which shows the defect which generate | occur | produces in a color filter.

Explanation of symbols

  1,71,81,91 coating needle, 2,72,82,92 taper portion, 3,73,83,93 flat surface, 5,75,85,95 water-repellent layer, 6 substrate, 21 ink coating mechanism, 22 coating needle drive cylinder, 23 drive shaft, 24 holding member, 25 rotary table, 26 rotary shaft, 27 notch, 28, 29, 30, 31 ink tank, 32 cleaning device, 33 air purge device, 34 motor, 35 index plate , 36 Index sensor, 37 Origin return sensor, 40 Observation optical system, 41 CCD camera, 42 Laser, 43 Ink curing illumination, 44 Z-axis table, 45 X-axis table, 46 Y-axis table, 47 Control computer, 48 operation panel, 84 grooves, 94 flat surface, 300 black matrix, 301 R pixel, 302 G pixel 303 B pixel, 304 white defect, 305 black defect, 306 foreign substance defect.

Claims (5)

In the application needle for applying the liquid material to the substrate by bringing the tip into contact with a fine region on the substrate,
A coating needle in which a water repellent layer containing a water-repellent resin material is formed on at least a part of the surface.   The application needle according to claim 1, wherein the water repellent layer is a layer obtained by impregnating or coating the metal material of the application needle with the resin material.   The application needle according to claim 1, wherein the resin material is used as a material of the application needle.   The application needle according to any one of claims 1 to 3, wherein the resin material has corrosion resistance.   The application needle according to any one of claims 1 to 4, wherein the resin material is a fluororesin.

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