JP2010194490A - Coating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coating device capable of inhibiting bubbles from being included into a container even if the vertical moving speed of a coating needle is raised, allowing accurate repair, scarcely permitting the coating needle from being deformed and capable of drawing a repair line with a continuous smooth contour. <P>SOLUTION: The coating device comprises a coating container having a space for accommodating a paste-like coating inside and an opening formed in the bottom thereof for allowing the space and the outside to communicate with each other, the needle of a circular horizontal cross-section shape vertically movably supported on the vertical line passing the center of the opening, a drive source for vertically moving the coating needle between a coating position where the tip end of the needle protrudes below the opening and a stored position where the tip end is drawn into the coating container, a table on which an object is placed, and a moving device for moving the table within a horizontal plane. The diameter d of the tip end of the needle and the diameter D of the opening satisfies d/D≤0.2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a coating apparatus, and more particularly, to a coating apparatus used when a defect such as a short circuit of a wiring in a wiring board such as a liquid crystal display panel or a plasma display panel is repaired with a paste-like coating material. .

  Conventionally, various devices for repairing defects on a substrate such as a liquid crystal display panel or a plasma display panel have been proposed, but roughly divided into a type that discharges a coating material from a nozzle to a repair portion, There is a type that transfers and applies the applied material adhered to the tip of the application needle to the restoration part. As the latter type of application device, for example, as shown in Patent Documents 1 and 2, an application needle having a diameter substantially the same as that of the opening is projected from the bottom opening of the container into which the application is injected. There has been proposed an apparatus for transferring and applying a coating material adhering to the tip of a metal to a defective portion to be repaired.

  However, in this conventional coating apparatus, bubbles may be caught in the container as the coating needle is pulled into the container, and as a result, the coating material is continuously and stably applied. In other words, it is difficult to transfer and apply the coated material to the repaired portion accurately. The entrainment of bubbles in the container becomes particularly noticeable when the speed at which the coating needle is moved up and down is increased in order to increase the repair speed. Therefore, the conventional coating apparatus cannot increase the defect repair speed. is there.

  Further, in the above-described conventional coating apparatus, the coating needle is adapted to transfer and apply the coating material adhering to the tip of the coating needle to the repair site by bringing the tip of the coating needle into contact with the coating surface. Since the width of the electrode on the substrate is very small, the wire diameter of the application needle is generally very small, and even a slight contact pressure may cause distortion in the application needle. When the coating needle is distorted, there is a problem that the vertical movement of the coating needle is hindered, and the coating material cannot be applied at an accurate position. Furthermore, the above-described conventional coating apparatus has a drawback that the repair line drawn by the coated and transferred coated product is dumped and the contour is not smooth.

JP 2006-276188 A JP 2006-310266 A

  The present invention has been made to solve the above-mentioned problems of conventional coating apparatuses. Even if the speed at which the coating needle is moved up and down is increased in order to increase the repair speed, bubbles are trapped in the container. Therefore, it is an object of the present invention to provide a coating apparatus that can perform accurate repair, can hardly cause distortion in the coating needle, and can draw a smooth repair line with a continuous contour.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that the entrainment of bubbles in the container due to the vertical movement of the application needle involves the size of the opening of the container for storing the application and the application It has been found that the bubble diameter can be effectively prevented by setting the tip diameter of the application needle to 0.2 or less of the opening diameter of the container.

  That is, the present invention provides the above-described problem, a coating material container having a space portion for accommodating a paste-like coating material inside, and having an opening for communicating the space portion and the outside on the lower surface; An applicator needle having a circular horizontal cross-sectional shape supported so as to be movable up and down on a vertical line passing through the center; an applicator needle, an applicator position whose tip protrudes downward from the opening, and a tip inside the applicator container A drive source that moves up and down between the retracted accommodation position; a table on which the object is placed; and a moving device that moves the table in a horizontal plane, the diameter d of the tip of the application needle, and the opening This is solved by providing a coating apparatus having a diameter D of d / D ≦ 0.2.

  In a preferred embodiment of the present invention, in addition to the above, the vertical distance L from the lower surface opening of the application container to the tip of the application needle at the application position is L / D with respect to the diameter D of the opening. It is good that it is in the range of ≦ 1.5, and this makes it possible to more effectively prevent entrainment of bubbles.

  In addition, the present inventors can transfer and apply the coating by adhering the coating material adhering to the lower surface of the tip of the coating needle to the coating surface without bringing the tip of the coating needle itself into contact with the coating surface. The thickness of the coating material adhering to the lower surface of the tip of the coating needle is found to be related to the size of the tip diameter of the coating needle, and s is the vertical distance from the coating needle tip to the object at the coating position. When s has a relationship of (1/2) d ≦ s ≦ d with respect to the diameter d of the tip of the application needle, the application can be transferred and applied without bringing the application needle into contact with the application surface. I found out.

  That is, according to the present invention, the vertical distance s from the tip of the application needle to the object at the application position has a relationship of (1/2) d ≦ s ≦ d with respect to the diameter d of the tip of the application needle. By providing the above, the above-mentioned problems are solved.

  The applicator needle preferably has a tapered surface with a concavity at the tip, and the drive source for moving the applicator needle up and down is preferably a piezoelectric element. When a piezoelectric element is used as the drive source, it is advantageous because the application needle can be driven up and down with a minute amplitude and at a high frequency.

  Furthermore, the present inventors have found that in the conventional coating apparatus, each time the coating needle moves up and down, the coating material adhering to the tip of the coating needle becomes a separate lump on the coating surface. Since the transfer line is transferred and applied, the repair line formed by the transferred application is assumed to be dumped, and the feed pitch of the object to be moved for each vertical movement of the application needle As a result of various trials and changes, the vertical distance s from the tip of the application needle to the object at the application position is (1/2) d ≦ s ≦ d with respect to the diameter d of the tip of the application needle. In the case of the coating apparatus having the relationship, the feeding pitch of the object is set to a range of 1/3 to 1/2 of the diameter d of the tip of the coating needle, thereby being drawn by the coated and coated coated material. We found that the restoration line was smooth and continuous.

  Therefore, according to the present invention, while the application needle rises from the application position and then descends to the application position, the table on which the object is placed is reduced to 1/3 to 1/2 of the diameter d of the tip of the application needle. The above-described problems are solved by providing a coating apparatus including a control device that moves in the horizontal direction by a distance.

  According to the coating apparatus of the present invention, even if the coating needle is moved up and down at high speed, bubbles are unlikely to be entrained in the coated material container, so that faster and more efficient repair is possible. Further, since the application needle does not come into contact with the object, there is an advantage that the application needle is hardly distorted, and the life of the application needle is extended and the maintenance is facilitated. Further, the repair line drawn by transferring and applying the coating has the advantage that the contour is smooth and continuous, and a beautiful restoration closer to the original shape is possible.

It is the schematic which shows an example of the coating device of this invention. It is an enlarged view of a coated material container and a coating needle. It is a schematic diagram which shows the relationship between a coating needle and a coated material when it exists in the range of L / D <= 1.5. It is a schematic diagram which shows the relationship between a coating needle and a coated material when it exists in the range of L / D> 1.5. It is a schematic diagram which shows the relationship between a coating needle front-end | tip and a target object (application | coating surface). It is a schematic diagram which shows the state in which a repair line is drawn by the transfer and the apply | coated application thing. It is an enlarged view of an application needle and a subject. It is a figure which shows a state when an application needle | hook has reached the application position. It is a figure which shows an example of the repair line drawn.

  Hereinafter, the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the illustrated one.

  FIG. 1 is a schematic view showing an example of a coating apparatus of the present invention. In FIG. 1, reference numeral 1 denotes a coating apparatus of the present invention, reference numeral 2 denotes a coating material container, and 3 denotes a paste-like coating material housed in a space inside the coating material container 2. As the coating 3, a conductive paste is used in which fine particles of conductive metal such as gold, silver, platinum, and copper are stably dispersed in an organic solvent. Reference numeral 4 denotes an opening provided on the lower surface of the application container. The opening 4 communicates the internal space of the application container with the outside. The horizontal cross-sectional shape of the applied product container 2 is usually circular, and the shape of the opening 4 provided on the lower surface thereof is also circular.

  Reference numeral 5 denotes a holding body for fixing and holding the application container 2, which is coupled to the support arm 6, and the support arm 6 is attached to the support arm base 7 so as to be movable in the vertical direction. Reference numeral 8 denotes a manual or electric drive unit that moves the support arm 6 in a direction perpendicular to the support arm base 7.

  An application needle 9 is fixed to the application needle fixing plate 10 at the base portion. Reference numeral 11 denotes a linear guide that supports the application needle fixing plate 10 so as to be movable in the vertical direction. The application needle 9 can be moved up and down on a vertical line passing through the center of the opening 4 by the application needle fixing plate 10 and the linear guide 11. It is supported by. The application needle 9 is usually formed of a thin metal wire such as tungsten, and its horizontal cross-sectional shape is circular. Moreover, the taper surface of a downward constriction is provided in the downward direction and the front-end | tip part so that it may mention later.

  Reference numeral 13 denotes a drive source that generates a reciprocating motion in the vertical direction, and moves the application needle 9 up and down via the operating body 14 and the application needle fixing plate 10. Any driving source 13 may be used as long as the applicator needle 9 can be moved up and down. From the viewpoint of generating a fine reciprocation with a high frequency, a piezoelectric element is used. It is desirable to use it. As such a piezoelectric element, for example, a piezoelectric element with a displacement enlarging mechanism disclosed in JP 2008-99399 A can be cited. Reference numeral 15 denotes a displacement sensor, and the displacement sensor 15 measures the vertical displacement of the operating body 14 that moves up and down in a contact or non-contact manner, so that the vertical position of the application needle 9 and the stroke of the vertical movement are determined. You can know the length. The displacement sensor 15 may measure the vertical displacement of the application needle 9 itself, not the displacement of the operating body 14.

  The support arm base 7, the drive unit 8, the support arm 12 of the linear guide 11, and the drive source 13 are fixed to a lifting platform 17 that is attached to the main body 16 of the coating apparatus 1 so as to be movable in the vertical direction. . Reference numeral 18 denotes a manual or electric drive unit that raises and lowers the lifting platform 17.

  19 is a table attached to the main body 16 so as to be movable in the horizontal direction at least on the X axis and Y axis, 20 is a drive unit for moving the table 19 in the horizontal direction, and 21 is placed on the table 19. It is a target object.

  Reference numeral 22 denotes a non-contact distance sensor attached to the lower surface of the holding body 5 and measures the distance to the object 21, that is, the application surface. By obtaining the distance in the vertical direction between the distance sensor 22 and the opening 4 of the application container 2 in advance, the distance from the opening 4 to the application surface of the object 21 is known based on the measured value by the distance sensor 22. be able to.

  Reference numeral 23 denotes a control device that receives signals from the displacement sensor 15 and the distance sensor 22 via a signal line (not shown), and controls the operation of the drive units 8, 18, 20 and the operation of the drive source 13. is there. Reference numeral 24 denotes an input / output device. Through this input / output device 24, various settings and changes can be made for the coating apparatus 1 and its operation, and the setting status and operating state of the coating apparatus 1 can be confirmed. .

  FIG. 2 is an enlarged view showing only the application container 2 and the application needle 9. In the figure, an application needle 9 indicated by a solid line indicates an application needle at an application position for transferring and applying an application to an object (application surface), and an application needle 9 indicated by a broken line is drawn into the application container 2. The applicator needle is shown in the stored position. D indicates the diameter of the opening 4, and d indicates the diameter of the tip of the application needle 9. V is the stroke length of the vertical movement of the application needle 9 and corresponds to the vertical distance between the accommodation position indicated by the broken line and the application position indicated by the solid line. L is the distance in the vertical direction from the opening 4 to the tip of the application needle 9 at the application position, and corresponds to the protruding length of the tip of the application needle 9 from the opening 4. As shown in the drawing, a tapered surface 25 having a lower concavity is provided at the tip of the application needle 9.

  In the coating apparatus 1 according to the present invention, the relationship between the diameter D of the opening 4 and the diameter d of the tip of the coating needle 9 is restricted to a range of d / D ≦ 0.2, so that the coating needle 9 is in the storage position. When rising upward, air bubbles are prevented from being entrained in the coating material container 2 from the outside. Hereinafter, the experiment which acquired said knowledge is demonstrated.

<Observation experiment of bubble entrainment>
That is, using the combination of the application container 2 and the application needle 9 shown in FIG. 2, the diameter D of the opening 4 and the tip diameter d of the application needle 9 are variously changed, and the vertical movement of the application needle is repeated. The presence or absence of entrainment of bubbles at that time was observed. “X” indicates that bubbles are immediately entrained after starting the up-and-down movement of the application needle, “△” indicates that entrainment of bubbles occurs after several seconds, “△” indicates that entrainment of bubbles does not occur even if continued for 10 seconds or more. The results are shown in Table 1 as “◯”. The experimental conditions are as follows.

Application: “Silver nanopaste NPS-HTB” (manufactured by Harima Chemicals Co., Ltd.) (viscosity: 100 Pa · s)
Stroke length V: 200 μm
Projection length L from the opening: 100 μm
Driving source: Piezoelectric element Vertical movement speed of application needle: 20 times / second Observation device: High-speed camera ("FASTCAM SA1.1" (manufactured by Photoron Co., Ltd.)

  As shown in Table 1, according to experiments conducted by variously changing the diameter D of the opening 4 and the tip diameter d of the application needle 9, the diameter D of the opening 4 and the diameter d of the tip of the application needle 9 are obtained. When d / D ≦ 0.2, no entrainment of bubbles in the coating material container was observed even when the coating needle was moved up and down at a high speed of 20 times / second. Based on this result, in order to increase the number of vertical movements of the application needle 9 per second and increase the repair speed, the relationship between the diameter D of the opening 4 and the diameter d of the tip of the application needle 9 is expressed as d / It has been found that it is effective to regulate in the range of D ≦ 0.2. As long as the experiment was conducted, the lower limit of d / D could not be found. However, if d is too small, the strength of the application needle 9 cannot withstand the vertical movement in the viscous fluid. Is estimated to be about 0.01 confirmed in the above experiment.

  Next, the diameter D of the opening 4 and the tip diameter d of the application needle 9 are fixed to d = 2 μm and D = 200 μm, which have obtained good results in the above experiment, and the accommodation position of the application needle 9 is set to the above-described position. By fixing the same position as in the experiment and changing the stroke length V, the protrusion length L was changed, the other conditions were the same as in the above experiment, and the presence or absence of bubble entrainment at that time was observed. The results are shown in Table 2.

  As shown in the results of Table 2, when d / D is 0.2, entrainment of bubbles was not observed even when L was changed between 50 μm and 300 μm, but L became 350 μm, and L When / D exceeded 1.5, it was evaluated as “Δ”, in which bubbles were involved after several seconds. From the above results, it was determined that the upper limit of L / D is preferably 1.5 or less in order to more effectively prevent the entrainment of bubbles in the coated product container. In addition, although experiment was not performed when L is less than 50 μm and L / D is less than 0.4, when L / D is too small and less than 0.4, the tip of the application needle 9 is applied at the application position. It is considered that the amount of the coating material adhering to the surface becomes too large, and it becomes difficult to transfer and apply the coating material with a desired line width. Therefore, the lower limit of L / D is preferably 0.4.

  The above results are interpreted as follows using FIG. 3 and FIG. 4, for example. That is, FIG. 3 is a schematic diagram showing the relationship between the application needle 9 and the application product 3 when L / D ≦ 1.5. As shown in FIG. When the length L is appropriate for the diameter D of the opening 4, the side surface of the application needle 9 is covered with the application material 3 including the tip portion at the application position. For this reason, even if the application needle 9 is lifted to the storing position after the application material 3 is transferred and applied to the application surface, the side surface of the application needle 9 is covered with the application material 3, so that air bubbles are mixed in from the outside. There is no.

  However, as shown in FIG. 4, when the protrusion length L of the application needle 9 is too long compared to the diameter D of the opening 4 and L / D exceeds 1.5, the flow of the application material 3 is The application needle 9 cannot be lowered, and the application material 9 is cut off halfway, and an exposed portion 26 whose side surface is not covered with the application material 3 is generated in the application needle 9. When the application needle 9 is drawn into the storage position in this state, air is drawn into the application container 2 from the outside together with the exposed portion 26 whose side surface is not covered with the application substance 3, and there are slight bubbles. Is considered to occur. As shown in FIG. 4, when L is too long and the applied product 3 is interrupted, the applied product to be transferred and applied to the object adheres to the vicinity of the tip of the application needle 9. This results in inconvenience that the repair line becomes a dumpling or becomes partially thin.

  In the coating apparatus 1 of the present invention, in order to adjust L / D to 1.5 or less, the value of D can be obtained by measuring in advance. Therefore, the amplitude of the vertical movement generated by the drive source 13 is determined by a displacement sensor. 15 with reference to the measurement value of 15 or operating the drive unit 8 manually or via the control device 23 to appropriately move the holding body 5 up and down, so that the application container 2 and the application needle 9 are relatively moved. The length of L may be changed by adjusting the positional relationship.

  FIG. 5 is a schematic diagram showing the relationship between the tip of the application needle 9 and the object (application surface). In FIG. 5, s represents a vertical distance between the tip of the application needle 9 and the object 21. As described above with reference to FIG. 3, in the coating apparatus 1 of the present invention, the tip and the side surface of the coating needle 9 are covered with the coating 3 even at the coating position. According to what the present inventors have confirmed, the thickness of the coating 3 covering the tip of the coating needle 9 is substantially the same as the diameter d of the tip. Therefore, when the tip of the application needle 9 is brought close to the object 21 to a distance equal to or less than the diameter d of the application needle tip, the application 3 attached to the tip comes into contact with the object 21, and the object 21 The material 21 is transferred and applied. That is, if the application needle 9 is brought close to the object 21 until s ≦ d, the application object 3 is transferred and applied to the object 21 without the tip of the application needle 9 being in contact with the object 21. It is possible.

  However, if the tip of the application needle 9 is too close to the object 21, the tip of the application needle 9 comes into contact with the object 21 in the event of a disturbance or the like, and the object 21 as well as the application needle 9 is damaged. Therefore, the distance s between the tip of the application needle 9 and the object 21 is preferably kept at least at least ½ of the diameter d of the tip of the application needle. That is, the tip diameter d of the application needle 9 and the distance s between the tip of the application needle 9 and the object 21 are regulated so that both satisfy the relationship of (1/2) d ≦ s ≦ d. It will be good.

  Thus, in the coating apparatus 1 shown in this example, the coating needle 9 is configured to transfer and apply the coating material to the object 21 (application surface) without contacting the object 21. For this reason, the applicator needle 9 is not distorted, and there is an advantage that the life of the applicator needle can be extended and the maintenance can be facilitated.

  In the coating apparatus 1 of the present invention, in order to satisfy the relationship of (1/2) d ≦ s ≦ d, the value of d can be obtained by measuring in advance. The distance from the lower surface of the object 21 to the object 21 is measured, based on the distance, the distance from the lower surface of the holding body 5 to the opening 4 obtained separately, and the protrusion length L at the application position of the application needle 9, The drive unit 18 may be operated manually or via the control device 23 to adjust the distance s between the tip of the application needle 9 and the object 21.

  FIG. 6 is a schematic diagram showing a state in which a repair line is drawn on the object 21 by the applied and applied application 3. In FIG. 6, reference numeral 27 denotes a repair line formed by the coating 3. That is, when the table 19 is moved in the direction of the arrow in synchronization with the movement of the application needle 9 while moving the application needle 9 vertically in the vertical direction between the application position and the storage position, A repair line 27 composed of the applied materials 3a, 3b,... Transferred and applied each time is drawn.

  FIG. 7 shows only the application needle 9 and the object 21 in an enlarged manner. The application needle 9 is in the process of descending from the storage position to the application position, and the application objects 3a, 3b... Are already transferred and applied onto the object 21 by the vertical movement of the application needle 9, and the repair line 27 is formed. It is partly drawn. In the case of this figure, each time the applicator needle 9 moves up and down once, the object 21 is moved by the table 19 in the left direction in the figure by a distance of ½ of the tip diameter d of the applicator needle 9. . That is, the table 19 on which the object 21 is placed until the application needle 9 rises from the application position and then lowers to the application position has a distance of ½ of the diameter d of the tip of the application needle 9. It is moving horizontally. Such an operation of the table 19 is realized by moving the table 19 at a predetermined pitch by the control device 23 in synchronization with the vertical movement of the application needle 9.

  As described above, the thickness of the coating 3 covering the tip of the coating needle 9 is substantially the same as the diameter d of the tip, and the coating 3 itself has a slight fluidity. The applied products 3a, 3b,... Spread on the object 21 in a hemispherical shape whose diameter is almost twice the tip diameter d. Therefore, if the movement distance of the object 21 with one up-and-down movement of the application needle 9 is (1/2) d, the application products 3a, 3b,. It overlaps and exists on the target object 21. When the moving distance of the object 21 with one up-and-down movement of the application needle 9 exceeds (1/2) d, the overlapping of the applied and applied objects 3a, 3b,. The repair line 27 tends to have a dumped outline.

  FIG. 8 shows a state in which the application needle 9 descends from the position of FIG. 7 and reaches the application position. When the application needle 9 reaches the application position, as shown in FIG. 8, not only the application material adhering to the tip of the application needle 9 but also the application adhering to the tapered surface 25 of the tip side portion of the application needle 9. The object 3 is also transferred and applied onto the object 21 by contacting the objects 3a, 3b,... Already existing on the object 21 and attracting each other. The application 3 supplied from the tapered surface 25 on the side of the application needle 9 compensates for the shortage of the application 3 adhering to the tip of the application needle 9 and contributes to smoothing the repair line. It is thought that there is. FIG. 9 shows an example of the repair line 27 to be formed. As shown in FIG. 9, although the repair line 27 is formed by transferring and applying the coatings 3a, 3b... At each time, the outline is as if it were drawn continuously. So smooth.

  Note that the distance by which the table 19 on which the object 21 is placed is moved from the application position to the next application position is 1 / diameter of the diameter d of the tip of the application needle 9. It may be smaller than 2. However, if the moving pitch of the table 19 is too small and less than (1/3) d, the applied material is repeatedly transferred and applied to the same location, and the width of the repair line is unnecessarily widened. In addition, there is a disadvantage that the length of the repair line that can be drawn per unit time is shortened and the repair speed is slow. Therefore, the distance by which the table 19 is moved before the application needle 9 rises from the application position and then drops to the application position is equal to or less than ½ of the diameter d of the tip of the application needle 9. It is desirable to be 3 or more.

  As described above, according to the coating apparatus of the present invention, a piezoelectric element is used as a drive source, and a coating needle or the like is transferred and coated by moving the coating needle up and down at a speed of 10 times or more per second. However, the entrainment of bubbles does not occur in the coated material container, and a constant amount of coated material can always be transferred and coated on the object. Further, according to the coating apparatus of the present invention, the tip of the coating needle is not in direct contact with the object, so that the coating needle is not distorted by impact, and the service life of the coating needle can be extended and maintenance can be facilitated. it can. Furthermore, according to the coating apparatus of the present invention, a repair line with a smooth contour can be drawn, so that a required repaired part can be repaired more reliably and cleanly. The coating apparatus of the present invention has great utility in the industrial field related to the manufacture of liquid crystal display panels and plasma display panels.

DESCRIPTION OF SYMBOLS 1 Application | coating apparatus 2 Application object container 3 Application object 4 Opening 5 Holding body 6, 12 Support arm 7 Support arm base 8, 18, 20 Drive part 9 Application needle 10 Application needle fixing plate 11 Linear guide 13 Drive source 14 Operating body 15 Displacement sensor 16 Main body 17 Lifting table 19 Table 21 Object 22 Distance sensor 23 Control device 24 Input / output device 25 Tapered surface 26 Exposed portion 27 Repair line D Opening diameter d Coating needle tip diameter V Stroke length L Distance from the opening s Distance between the tip of the application needle and the object

Claims (7)

  A coating container having a space for accommodating a paste-like coating on the inside and having an opening on the lower surface for communicating the space and the outside; supported vertically movable on a vertical line passing through the center of the opening; An applicator needle having a circular shape in horizontal cross section; the applicator needle is moved up and down between an application position in which the tip protrudes downward from the opening and a storage position in which the tip is drawn into the application container A driving source to be placed; a table on which the object is placed; and a moving device for moving the table in a horizontal plane, wherein the diameter d of the tip of the application needle and the diameter D of the opening are d / D ≦ 0. Application device in the range of.   2. The coating apparatus according to claim 1, wherein the distance L in the vertical direction from the lower surface opening of the coating material container to the tip of the coating needle at the coating position is in the range of L / D ≦ 1.5 with respect to the diameter D of the opening. .   The vertical distance from the lower surface opening of the application container to the table on which the object is placed and / or the vertical distance L from the lower surface opening of the application container to the tip of the application needle at the application position are adjusted. Means and a means for measuring the distance from the lower surface of the application container to the object placed on the table, and the vertical distance s from the tip of the application needle to the object at the application position is The coating apparatus according to claim 1, wherein the coating apparatus has a relationship of (½) d ≦ s ≦ d with respect to the diameter d of the tip.   The applicator according to any one of claims 1 to 3, wherein the applicator needle has a tapered surface with a concavity at the tip.   The coating apparatus according to any one of claims 1 to 4, wherein the driving source for moving the coating needle up and down is a piezoelectric element.   While the application needle is raised from the application position and then lowered to the application position, the table on which the object is placed is moved in the horizontal direction by a distance of 1/3 to 1/2 of the diameter d of the tip of the application needle. The coating apparatus in any one of Claims 1-5 provided with the control apparatus to be made. The coating apparatus according to any one of claims 1 to 6, wherein the coated material is a conductive metal paste.

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