JP2012050968A - Device for applying paste and method of applying the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for applying paste increasing accuracy in repairing application for a defectively applied part of a pattern applied and drawn on a substrate of a liquid crystal display device or the like, and to provide a method of applying paste in repairing application.SOLUTION: The device for applying paste 10, which includes a moving device 28 relatively moving a nozzle 26 and the substrate 16 and also includes a discharge device 25 discharging the paste from the nozzle 26, includes an application repairing pattern selection part 36C selecting an application repairing pattern 45A or 45B when repairing application for the defectively applied part 33A of the applied and drawn pattern 33, and a control device 36 controlling the moving device 28 and the discharge device 25 so as to repair application of the defectively applied part 33A with the selected application repairing pattern 45A or 45B.

Description

  The present invention relates to a paste coating apparatus capable of coating and repairing a coating defect portion of a pattern drawn and drawn on a substrate by discharging a paste from a nozzle, and a paste coating method for coating and repairing a coated and drawn pattern.

  In the manufacturing process of the liquid crystal display panel, a sealing agent as a paste is applied in a rectangular frame pattern on one of the two rectangular glass substrates, and the two substrates and the sealing agent pattern are applied. The liquid crystal is sealed in a region surrounded by. A paste coating device is used for applying the sealant.

  The paste applicator is preset on the substrate by discharging a sealant from the nozzle while moving one of the stage or nozzles in a horizontal plane with respect to the other while holding the substrate on the stage. Apply and draw a frame-shaped pattern. At this time, the distance (gap) between the substrate and the nozzle tip is kept constant so that the coating amount on the substrate is constant.

  Here, when the pattern is applied and drawn on the substrate, bubbles are mixed in the sealing agent, or the viscosity of the sealing agent changes, and the pattern of the sealing agent applied and drawn on the substrate is broken. May occur. When such a coating defect occurs, the liquid crystal sealed between the substrates bonded in the subsequent process of bonding the two substrates leaks from the disconnected portion, and the liquid crystal display panel becomes a defective product, resulting in production yield. Decreases.

  By the way, when repairing a broken portion by coating and repairing with a linear pattern, as in the case of applying and drawing a sealing agent pattern on the surface of the substrate, the sealing agent may or may not adhere to the substrate. It may be easy to peel off.

  This is because when the sealant is applied linearly, the nozzle and the substrate move relative to each other along the surface of the substrate, so that the nozzle moves relative to the substrate immediately after being applied to the surface of the substrate. This is thought to be due to the tensile force acting in the direction.

  Therefore, if the part where the sealant is applied on the surface of the substrate is in a state where it is difficult for the sealant to adhere, the application amount of the sealant decreases or breaks off at that part, and repair is performed with the required application amount. May not be possible.

  Here, the state in which the sealant is difficult to adhere is, for example, a state in which the sealant is repelled. This is because the pattern formed on the surface of the substrate has a characteristic pattern that repels the sealant or in an upstream process. This is considered to be caused by the fact that a sufficient amount of oil or the like is allowed to remain in the substrate in the step of cleaning the substrate.

  In addition, when applying the sealing agent to the surface of the substrate with a coating repair pattern on the line, control to maintain the interval between the tip of the nozzle and the surface of the substrate at the interval necessary for applying and drawing the sealing agent, so-called Gap control is performed. The gap control measures the distance between the laser displacement meter and the surface of the substrate with a laser displacement meter provided integrally with the nozzle, and determines the position of the tip of the nozzle and the substrate from the vertical positional relationship between the nozzle and the laser displacement meter. The distance between the surface and the surface is calculated, and the calculated value is fed back to adjust the vertical position of the nozzle to the required distance.

  In this way, as shown in FIG. 6A, when repairing a broken portion with a low island portion 33D in between with a linear coating repair pattern, the measurement point of the laser displacement meter 34 is indicated by an arrow. If the nozzle 26 is positioned in front of the substrate 16 in the advancing direction, the gap control is performed on the island portion 33D so that the gap between the upper surface and the tip of the nozzle 26 is the required gap G1. It will be. As a result, as schematically shown by the alternate long and short dash line in FIG. 6A, the same amount of sealing agent as the disconnected portion 33A without the island portion 33D is applied on the island portion 33D. As a result, the pattern of the sealing agent after the application repair is excessive in the island portion 33D by the application amount of the island portion 33D.

  Patent Document 1 discloses a coating apparatus that applies a viscous material (sealer material) to a workpiece such as an automobile panel. This application device detects the application width of the sealer material applied linearly to the workpiece with a sensor attached to the rear of the application nozzle, and detects the part where the application width of the sealer material is less than the predetermined width or no part at all. It is determined that there is a coating defect portion, and the sealer material is re-applied to the portion determined to be a coating defect portion and repaired. At the time of application, the application control means counts the time from the application start time and stores the position of the application defect portion.

  Re-application is by moving the application nozzle along the application trajectory of the sealer material, and discharging the sealer material from the application nozzle in accordance with the time from the application start time when the application nozzle passes through the stored defective portion, Re-apply the sealer material only to the coating defect.

  However, the coating apparatus disclosed in Patent Document 1 does not disclose or suggest that the coating repair accuracy is improved when the sealer material is repaired by repairing a portion determined to be a coating defect portion.

Japanese Patent Laid-Open No. 1-159075

  An object of the present invention is to successfully repair a coating defect portion in a pattern drawn and drawn on a substrate, and to reduce the occurrence of defective products, and a paste coating method at the time of coating repair Is to provide.

  According to a first aspect of the present invention, there is provided a paste application device that discharges paste from a nozzle and applies and draws the paste on a substrate in a preset pattern, and a moving device that relatively moves the nozzle and the substrate; An ejection device for ejecting a paste; a coating repair pattern selection unit for selecting a coating repair pattern when coating and repairing a coating defect portion of the coating-drawn pattern; and the coating defect portion with the selected coating repair pattern. The moving device and a control device for controlling the discharge device so as to repair the coating are provided.

  The invention of claim 2 further comprises a position setting unit for setting information relating to the position of a coating defect portion of the coating drawn pattern in the invention of claim 1, and the coating repair pattern selecting unit includes the position setting unit. The coating repair pattern is selected for each position set in (1).

  According to a third aspect of the present invention, in the first or second aspect of the invention, the coating / repair pattern selecting unit can select either a linear coating / repair pattern or a dotted coating / repair pattern.

  According to a fourth aspect of the present invention, there is provided a paste application apparatus that discharges paste from a nozzle and applies and draws on a substrate in a preset pattern, and a moving device that relatively moves the nozzle and the substrate; An ejection device for ejecting paste, an input unit for inputting information on the length of a coating defect portion of the pattern drawn and drawn, and repairing the coating defect portion with a linear coating repair pattern, A threshold setting unit that sets a threshold for selecting whether to repair with a coating repair pattern, and a comparison unit that compares the length of the coating defect portion with the threshold based on information on the length of the coating defect portion of the pattern Based on the comparison result of the comparison part, the application repair for selecting whether the application defect part is repaired by the linear application repair pattern or the spot application repair pattern is selected. A pattern selection section, in which and a control unit for controlling the mobile device and the discharge device so that the coating defect coating repair with coating repair patterns said selected.

  According to a fifth aspect of the present invention, in the fourth aspect of the invention, the apparatus further comprises a disconnection detecting device for detecting a coating defect portion of the coated and drawn pattern, and the input unit applies the pattern from the detection result of the disconnection detecting device. Information on the length of the defective portion is obtained.

  According to a sixth aspect of the present invention, in the fifth aspect of the invention, the disconnection detection device further comprises a distance detector that measures the height of a pattern that is ejected from the nozzle and applied and drawn on the substrate. .

  According to a seventh aspect of the present invention, there is provided a paste application method for applying and drawing a paste on a substrate in a preset pattern by relatively moving the substrate and a nozzle for discharging the paste onto the substrate. Based on the information on the length of the coating defect portion, select whether to repair the coating defect portion with a linear coating repair pattern or a point-like coating repair pattern, and to the selected coating repair pattern Thus, the application defect portion is applied and repaired.

  According to an eighth aspect of the present invention, in the seventh aspect of the present invention, a threshold value for determining whether the coating defect portion is repaired with a linear coating repair pattern or a dotted coating repair pattern is determined. The point-shaped application repair pattern is selected when the length of the application defect portion is equal to or smaller than the threshold value, and the linear application repair pattern is selected when the length is greater than the threshold value. .

  According to the present invention, it is possible to satisfactorily repair the coating defect portion, and thus it is possible to reduce the occurrence of defects.

FIG. 1 is an overall perspective view of the paste application apparatus. FIG. 2 is a schematic perspective view showing an embodiment of the disconnection detecting device. FIG. 3 is a schematic view showing another embodiment of the disconnection detecting device. FIG. 4 is a schematic diagram showing an aspect of a coating defect portion of a pattern drawn and drawn. FIG. 5 is a schematic diagram showing a coating repair pattern. FIGS. 6A and 6B are schematic diagrams for explaining the setting of the gap when applying and repairing the disconnected portion. FIG. 6A shows the setting of the gap in the prior art, and FIG. 6B shows the setting of the gap in the embodiment. FIG. 7 is a schematic diagram showing the arrangement of laser displacement meters in another embodiment of the disconnection detection device.

  1 is an overall perspective view of a paste application apparatus, FIG. 2 is a schematic perspective view showing an embodiment of a disconnection detection apparatus, FIG. 3 is a schematic view showing another embodiment of the disconnection detection apparatus, and FIG. FIG. 5 is a schematic diagram showing a coating repair pattern, FIG. 6 is a schematic diagram for explaining the setting of a gap when coating and repairing a broken portion, and FIG. Is a conventional gap setting, FIG. 7B is a schematic diagram showing an arrangement of laser displacement meters in another embodiment of the disconnection detecting device.

(First embodiment)
Embodiment 1 of the present invention will be described below with reference to the drawings.

  FIG. 1 is a perspective view showing a schematic configuration of the paste coating apparatus 10, and the paste coating apparatus 10 includes a rectangular parallelepiped base 11. A Y table unit 12 is provided on the upper surface of the base 11. The Y table unit includes a Y table 12a, and the Y table 12a can be moved along the Y-axis direction (the front-rear direction of the paste applying apparatus 10 in FIG. 1) by driving the servo motor 13.

  A stage 15 is provided on the Y table 12 a via a θ rotation mechanism 14. As shown in FIG. 1, the stage 15 can be rotated in the horizontal plane around the Z axis that intersects the Y axis perpendicularly by the θ rotation mechanism 14. On the upper surface of the stage 15, for example, a glass rectangular substrate 16 used for manufacturing a liquid crystal display panel is placed and held by suction by means such as vacuum suction (not shown).

  A gate-shaped support body 20 is provided on the upper surface of the base 11 so as to straddle the Y table unit 12. A guide rail 21 that configures an X table unit 22 on the front surface of the horizontal beam portion of the support 20 along the X-axis direction (the horizontal direction of the coating apparatus in FIG. 1) perpendicular to the Y-axis direction. Is fixed. An X table 22a is provided on the guide rail 21 so as to be movable in the X-axis direction, and the X table 22a is driven by a driving means including a linear motor (not shown). The linear motor includes a magnet provided on the guide rail 21 and a coil provided on the X table 22a.

  A Z table 23 is provided on each X table 22 a so as to be movable in the Z-axis direction (vertical direction), and is driven by a servo motor 24.

  On the Z table 23, a discharge device 25 for discharging the sealant is provided. The discharge device 25 includes a syringe 27 having a cylindrical nozzle 26 at the tip, and the syringe 27 is detachably attached to a holder 29 that is fixed on the Z table 23. The syringe 27 is filled with a sealant as a paste, and the syringe 27 is connected to a pressurized gas source (not shown) via a conduit 30, and an electromagnetic on-off valve 31 is provided between the syringe 27 and the pressurized gas source. An electropneumatic regulator 32 is interposed downstream of the electromagnetic on-off valve 31. The sealing agent filled in the syringe 27 is pressurized by the pressurized gas from the pressurized gas source and is discharged from the nozzle 26 at the tip of the syringe 27. The electromagnetic on-off valve 31 opens and closes the communication between the syringe 27 and the pressurized gas source to control the discharge and stop of the sealing agent from the tip of the nozzle 26, and the electropneumatic regulator 32 controls the gas that pressurizes the sealing agent in the syringe 27. Adjust pressure.

  The X table unit 22, the Y table unit 12, and the Z table 23 are configured to connect the substrate 16 sucked and held on the stage 15 and the nozzle 26 of the discharge device 25 provided on the Z table 23 in the X axis direction and the Y axis direction. And a moving device 28 for relatively moving in the Z-axis direction.

  A distance detector composed of a laser displacement meter 34 is integrally attached and fixed to the syringe 27. The control device 36 to be described later acquires a measurement value of the distance (distance in the Z-axis direction) between the laser displacement meter 34 and the upper surface of the substrate 16 by the laser displacement meter 34, and the Z-axis direction between the nozzle and the laser displacement meter The distance (hereinafter referred to as a gap) between the nozzle tip and the upper surface of the substrate 16 is calculated from the positional relationship in FIG.

  On the Z table 23, an image pickup device including a CCD camera 35 is attached. The CCD camera 35 images the pattern 33 of the sealing agent applied and drawn on the substrate 16 and displays an application defect portion such as a disconnection portion 33A of the pattern 33 on the monitor. The CCD camera 35 is also used when the substrate 16 is positioned by imaging an alignment mark attached on the substrate 16.

  A control device 36 is provided on one side of the base 11 of the paste application device 10. The control device 36 controls the servo motor 13 of the Y table unit 12, the linear motor (not shown) of the X table unit 22, and the servo motor 24 that drives the Z table 23.

  The control device 36 controls the servo motor 24 of the Z table 23 based on the measurement value of the laser displacement meter 34 (hereinafter referred to as gap control) so that the gap becomes an interval necessary for applying and drawing the sealant. .

  The control device 36 controls the electromagnetic on-off valve 31 and the electropneumatic regulator 32. The controller 36 controls the opening and closing of the electromagnetic on-off valve 31 to control the discharge and stop of the sealing agent, and also controls the electropneumatic regulator 32 to adjust the gas pressure downstream of the electropneumatic regulator 32. Adjust the discharge pressure of the sealant.

  The paste application device 10 operates as described below.

  The control device 36 controls the driving of the X table unit 22, the Y table unit 12, and the Z table 23, and the length of each side of the coating pattern 33 to be coated and drawn on the substrate 16 stored in the storage unit of the control device 36. The nozzle 26 and the substrate 16 are moved relative to each other according to the coating pattern information such as the sheath position and the sealing agent is discharged from the nozzle 26 during the movement, and the pattern 33 is formed in a frame shape on the peripheral edge of the substrate 16. Apply and draw on.

  However, when the pattern 33 is applied and drawn, bubbles may be mixed in the sealing agent, or the viscosity of the sealing agent may change, so that an application defect portion such as disconnection may occur in the pattern 33. FIG. 4 shows an aspect of a coating defect portion of the pattern 33 drawn and drawn. FIG. 4A shows a case where a disconnection portion 33A including a gap is formed between the coating start point S and the coating end point F. ) Shows a case where a broken portion 33A is generated in a straight line portion in the middle of drawing, and (C) shows a case where a broken portion 33A is generated at the exit of a corner portion. If bubbles are mixed in the sealant, the coating pattern 33 is disconnected as shown in FIG. 4B while the bubbles are discharged from the nozzle 26. In this case, the disconnection portion 33A tends to be relatively long.

  Further, the disconnection portion 33A as shown in FIG. 4C occurs when there is a portion on the surface of the substrate 16 where it is difficult for the sealant to adhere, as described in the background art, and tends to have a relatively short length. It is in.

  In addition to the disconnection, there is a coating defect portion of the pattern 33 in which the coating amount is not constant, such as a portion that is not disconnected but has a low coating height, a portion that has a narrow coating width, or a portion that includes both. Thus, the aspect of the application | coating defect part of a pattern is not uniform.

  As shown in FIG. 2, in the subsequent process of the paste coating apparatus 10, a disconnection inspection apparatus 41 as a disconnection detection apparatus is used to detect a coating defect portion of the pattern 33 applied and drawn by the paste coating apparatus 10. 10 is provided separately. The disconnection inspection device 41 includes a stage 42 provided on a base (not shown) so as to be movable in the Y-axis direction, and a support 43 fixed on the base (not shown) so as to straddle the stage 42. An image pickup device including four CCD cameras 44 is provided on the front surface of the support 43 so that it can be independently driven in the X-axis direction. On the stage 42, the substrate 16 on which the pattern 33 is applied and drawn by the paste application device 10 in the previous process is placed and held.

  When the substrate 16 is placed and held on the stage 42, the disconnection inspection device 41 moves each CCD camera 44 along the applied pattern 33 according to the application pattern information received from the control device 36 of the paste application device 10. .

  For example, as shown in FIG. 2, when one rectangular frame-shaped sealing agent pattern 33 is formed on the substrate 16, first, the four CCD cameras 44 are moved leftward from the state shown in the figure. And the image of one side along the X-axis direction in the pattern 33 is shared and picked up.

  Next, only the rightmost CCD camera 44 is returned to the state shown in FIG. 2, the stage 42 is moved from the state shown in the figure toward the back side, and images of two sides along the Y-axis direction are displayed. Take an image using.

  Thereafter, the three CCD cameras 44 excluding the right end are moved to the right by the arrangement pitch of the CCD cameras 44, and the image of the other side along the X-axis direction is the same as the case of one side along the X-axis direction. Image. In this way, an image of the entire pattern 33 is taken.

  The disconnection inspection device 41 includes an image processing device (not shown). The image processing device captures an image of the pattern 33 on the substrate 16 captured by the CCD camera 44 and binarizes the captured image.

  The image processing apparatus obtains the start position and the end position of the disconnection portion as information related to the position of the disconnection portion from the binarized pattern 33 image, and the start end position and the end position as information related to the length of the disconnection portion. Find the distance between.

  This operation will be described with reference to FIG. 4B.

  First, the image processing apparatus sets measurement points at a preset interval t on the formation position of the pattern 33 based on the application pattern information.

  After setting the measurement points, the image processing apparatus scans each measurement point in order from the application start point S to the application end point F with a predetermined scanning width across the pattern 33 in the width direction, and the pattern 33 is measured for each measurement point. The edge of the width direction is detected. Then, the coating width is calculated from the detected distance between the end portions. The end portion in the width direction of the pattern 33 can be confirmed by detecting a portion having a large shade change. Further, the scanning width is set wide by a certain distance in the width direction of the pattern 33.

  Every time the application width is detected at the measurement point, the image processing apparatus determines the presence or absence of the application defect portion (disconnected portion 33A) of the pattern depending on whether or not the application width is equal to or greater than the threshold value. That is, when the application width is smaller than the threshold, the portion is determined as the disconnection portion 33A.

  When the disconnection part 33A is detected, the position (start position and end position) and length (distance between the start position and end position) of the disconnection part 33A are obtained.

  The position and length of the disconnection portion 33A can be obtained as follows.

  The position of the start end of the disconnection portion 33A is assumed to be at the measurement point a immediately before the measurement point b determined to be the disconnection portion 33A, and the coordinates of the intersection of the scanning line m and the center line of the pattern 33 at the measurement point a And Further, the position of the end point is assumed to be at the measurement point d where the detection of the application width is restarted from the measurement point b where the disconnection portion 33A is detected and then the application width equal to or greater than the threshold value is detected, and scanning at the measurement point d is performed. The coordinates of the intersection of the line m and the center line of the pattern 33 are used. Here, the position information of the center line of the pattern 33 can be obtained from the application pattern information.

  Further, the length of the disconnection portion 33A is obtained by calculating the distance between the start end (detection position a) and the end point (detection position d) obtained above.

  Needless to say, the smaller the interval between the measurement points b, the more accurately the positions of the start and end of the disconnection portion 33A can be obtained.

  In addition, here, the interval t described above is preferably set to a length shorter than the minimum length expected as the length of the disconnected portion 33A.

  If there is a disconnection portion 33A, an alarm is issued to notify the operator.

  As described above, the disconnection inspection device 41 detects the start and end positions of the disconnection portion 33A of the pattern 33 where the disconnection is detected, and the distance therebetween. The substrate 16 on which the pattern 33 in which the disconnection portion 33 is detected by the disconnection inspection device 41 is drawn is carried into the paste coating apparatus 10 to apply and repair the disconnection portion 33A in order to apply and repair the disconnection portion 33A.

  In order to apply and repair the disconnection portion 33A detected by the disconnection inspection device 41, the paste application device 10 selects whether to select the application repair method and set the application repair conditions manually or automatically. As a switching means, a changeover switch is displayed on the monitor display 46 as a touch panel.

  As shown in FIG. 1, the control device 36 of the paste coating apparatus 10 includes a position setting unit 36 </ b> A for setting information related to the position (coordinates) of the disconnection portion 33 </ b> A of the pattern 33 obtained by the disconnection inspection device 41; An application unit 36B for inputting information relating to the length of the disconnection portion 33A detected by the disconnection inspection device 41, and a coating defect portion such as the disconnection portion 33A of the coated and drawn pattern 33 as shown in FIG. An application repair pattern selection unit 36C is provided for selecting an application repair pattern (linear application repair pattern 45A or dotted application repair pattern 45B).

  Further, the control device 36 of the paste coating apparatus 10 further repairs the coating defect portion with the linear coating repair pattern 45A or applies the spot-shaped coating for repairing the detected disconnection portion 33A automatically. The threshold value setting unit 36D for setting a threshold value for selecting whether to repair with the repair pattern 45B, and the length of the disconnection portion 33A and the threshold value setting unit 36D based on the information about the length of the disconnection portion 33A of the pattern 33 are set. And a comparison unit 36F for comparing the threshold value. Based on the comparison result by the comparison unit 36F, the above-described application repair pattern selection unit 36C determines whether to repair the disconnection portion 33A with the linear application repair pattern 45A or with the dotted application repair pattern 45B. It is also possible to do.

  A monitor display 46 and a keyboard 50 are connected to the control device 36 of the paste application device 10.

  The control device 36 then moves the moving device 28 and the discharge device 25 of the paste coating device 10 so as to apply and repair the coating defect portion with the coating repair pattern 45A or 45B selected by the coating repair pattern selection unit 36C. Control.

  The application repair work for the application defect portion such as the disconnection portion 33A of the pattern 33 applied and drawn on the substrate 16 is performed as follows.

  As described above, when the disconnection portion 33 </ b> A is detected in the pattern 33 applied and drawn on the substrate 16, the substrate 16 in which the disconnection occurs based on the alarm of the disconnection inspection device 41 is carried into the paste application device 10. .

  The control device 36 sucks and holds the loaded substrate 16 on the stage 15, and performs alignment (positioning) of the substrate 16 using the CCD camera 35 provided on the Z table 23.

  Next, the control device 36 determines the position of the disconnection portion 33A, that is, the position of the start end and the end of the disconnection portion 33A, of the position of the disconnection portion 33A and the length of the disconnection portion 33A of the pattern 33 sent from the disconnection inspection device 41. Based on this position, the CCD camera 35 is moved onto the disconnection portion 33A that is closest to the application start point of the pattern 33 on the pattern 33, and the disconnection portion 33A is imaged by the CCD camera 35.

  The operator confirms the state of the disconnection portion 33 </ b> A captured by the CCD camera 35 on the monitor display 46, selects whether the application repair work for the application defect portion is performed manually or automatically, and switches on the monitor display 46. Set manually or automatically with the switch.

  First, the case where the selection of the coating repair method and the setting of the coating repair conditions are performed manually will be described.

  The operator inputs the application repair method and application repair conditions for the disconnected portion 33A according to the state of the disconnected portion 33A.

  As an application repair method for the disconnection portion 33A, the operator selects whether to repair with the linear application repair pattern 45A or with the dotted application repair pattern 45B depending on the length of the disconnection portion 33A, and the selected application The repair method is input from the keyboard 50 to the application repair pattern selection unit 36 </ b> C of the control device 36. For example, in the case where the length of the disconnection portion 33A is short enough to apply up to two point-like applications, the application repair pattern selection unit 36C selects the point-like application repair pattern 45B and is longer than two For this, a linear coating repair pattern 45A is selected.

  As will be described later, when the broken portion 33A is applied and repaired by the dot-shaped application repair pattern 45B, the pattern 33 and the application repair pattern 45B are applied so that a part of the pattern 33 and the application repair pattern 45B overlap with each other. When the coating diameter is the same as the coating width of the pattern 33, the length of the disconnection portion 33A that can be repaired by up to two dot-shaped coatings is smaller than the length twice the coating diameter.

  Here, a cursor with a scale engraved for each predetermined dimension is displayed on the screen of the monitor display 46, and the length of the disconnection portion 33A is determined based on the scale attached to the cursor. Anyway.

  Here, the linear coating repair pattern 45A and the dotted coating repair pattern 45B each include a coating repair pattern in which the coating amount can be changed halfway.

  As an input of application repair conditions, the operator applies the application start and end positions of the application repair pattern to the disconnection portion 33A to be applied and repaired, the discharge pressure, and the discharge time and application pitch of the sealing agent in the case of a dotted application repair pattern. The application speed, gap, and the like in the case of a linear application repair pattern are input from the keyboard 50. The discharge pressure is set by inputting the set pressure of the electropneumatic regulator 32 interposed between the syringe 27 and the pressurized gas source, and the discharge time of the sealing agent is set by setting the on / off time of the electromagnetic on-off valve 31.

  In setting the positions of the application start point and end point of the application repair pattern, the center of the cursor on the monitor display 46 is moved to the start end and end of the disconnection portion 33A, respectively, and the position of the application start point and end point is taught to the position setting unit 36A. Is done.

  For example, the application start point of the application repair pattern is set to a position on the end portion of the pattern 33 located at the start end of the disconnection portion 33A. At this time, as shown in FIG. 5, the end of the pattern 33 has a tapered shape such as a semicircular shape. Therefore, the width of the end of the pattern 33 is applied at an appropriate application amount as the application start point. The position is set to a position on the end that is 1 / n of the width of the pattern 33. Therefore, the operator locates on the screen of the monitor display 46 at the position where the width of the pattern 33 is 1 / n at the end of the pattern 33 and the center in the width direction of the pattern 33, and at that position. Move the center of the cursor. In this state, the keyboard 47 is operated to set the current position (coordinates) of the cursor as the application start point in the position setting unit 36A.

  Thus, when the application start point is set at a position on the end portion of the pattern 33, when repairing the disconnection portion 33A, the start end of the application repair pattern 45A overlaps the end portion of the pattern 33, and the end portion of the pattern 33 Since the coating amount of the sealing agent is supplemented, it is possible to prevent the coating amount of the sealing agent from becoming too small at the joint between the pattern 33 and the coating repair pattern 45A. Therefore, the uniformity of the coating amount can be ensured even at the joint.

  At this time, the value of n may be determined according to the shape of the end of the pattern 33. For example, as shown in FIG. 5, when the shape of the tip is semicircular, the value of n is preferably about 2-3.

  The position of the application end point is set in the same manner.

  When there are a plurality of disconnection portions 33A in the pattern 33 applied and drawn on the substrate 16, the above setting is performed for each disconnection portion 33A.

  In setting the positions of the application start point and the application end point, the side closer to the application start point S of the pattern 33 is set as the start point, and the far side is set as the end point.

  The control device 36 of the paste coating apparatus 10 drives and controls the moving device 28 and the discharge device 25 in accordance with the coating repair method selected by the coating repair pattern selection unit 36C and the input coating repair conditions, thereby disconnecting the portion 33A of the pattern 33. Repair of.

  For example, as shown in FIG. 5A, when repairing the broken line 33A that can be compensated by applying two points of the spot-shaped coating repair pattern 45B to the sealing agent, first, the nozzle 26 is positioned above the coating start point. The Y table unit 12 and the X table unit 22 are controlled so that the nozzle 26 and the substrate 16 are moved relative to each other. Then, the nozzle 26 is lowered from the standby position depending on the measured value of the laser displacement meter 34 until a set gap is obtained between the tip of the nozzle 26 and the surface of the substrate 16. When the set gap is obtained, the electromagnetic on-off valve 31 is opened for a set time, the sealant is discharged from the nozzle 26, and a predetermined amount of sealant is applied onto the substrate 16. When the set time elapses, the electromagnetic on-off valve 31 is discharged. Is closed and the nozzle 26 is raised to the standby position. Next, the nozzle 26 and the substrate 16 are relatively moved so that the nozzle 26 is positioned above the application end point, and the sealing agent is applied to the application end point in the same manner as described above.

  Further, as shown in FIG. 5B, when the broken portion 33A is repaired with a linear coating repair pattern 45A, first, the nozzle 26 is moved onto the coating start point. Then, the nozzle 26 is lowered from the standby position depending on the measured value of the laser displacement meter 34 until a set gap is obtained between the tip of the nozzle 26 and the surface of the substrate 16. Next, the nozzle 26 and the substrate 16 are relatively moved so that the nozzle 26 moves linearly to the coating end point. During this relative movement, the electromagnetic on-off valve 31 is controlled so that the discharge of the sealing agent is started with the start of the relative movement and the discharge of the sealing agent is stopped with the completion of the relative movement. When the nozzle 26 reaches the application end point, the nozzle 26 is raised to the standby position.

  Furthermore, as shown in FIG. 5C, when the two broken portions 33A arranged with the island portion 33D interposed therebetween are repaired with the dotted application repair pattern 45B and the linear application repair pattern 45A, the above-described FIG. 5 Perform in the same manner as in (A) and (B). That is, as shown by a broken line in the drawing, the shorter disconnection portion 33A is repaired with two dotted application repair patterns 45B, and the longer disconnection portion 33A is repaired with a linear application repair pattern 45A.

  In this example, it is assumed that a necessary coating amount is obtained in the island portion 33D.

  As described above, the broken disconnection portion 33A having a short length is repaired by a dotted application repair pattern 45B, and the long disconnected portion 33A is repaired by a linear application repair pattern 45A.

  Here, for linear application, if there is a part where the sealant is difficult to adhere to the part where the sealant is applied, for the reason described in the background art, the application amount of the sealant is reduced or interrupted at that part. Sometimes.

  On the other hand, in the dot application, since the nozzle 26 and the substrate 16 do not move relative to each other in the XY direction when the sealing agent is discharged from the nozzle, a tensile force in the XY direction does not act on the applied sealing agent. For this reason, even if the sealant is difficult to adhere to, it is difficult for the application amount to be reduced or to be interrupted, and the sealant can be stably adhered onto the substrate 16.

  Therefore, even if the surface of the substrate 16 has a short length of the broken portion 33A that may have occurred due to the property that the sealant is difficult to adhere, the broken portion 33A can be repaired satisfactorily.

  Next, the case where the application repair work of the application defect portion of the pattern 33 detected by the disconnection inspection apparatus 41 is automatically performed will be described.

  In order to automatically perform the coating repair work, the control device 36 of the paste coating apparatus 10 performs the above-described coating repair method and coating based on the position (coordinates) and length of the disconnection portion 33A detected by the disconnection inspection apparatus 41. A program for determining repair conditions is provided.

  First, the position (coordinates) of the disconnection portion 33A is sent from the disconnection inspection device 41 to the control device 36 of the coating device, and the position (coordinates) of the disconnection portion 33A in the paste application device 10 is obtained from the sent position by a program. It is done.

  Further, the length of the disconnection portion 33A is input from the disconnection inspection device 41 to the input portion 36B of the control device 36. The length of the disconnection portion 33A input to the input unit 36B is compared with the threshold of the length of the disconnection portion 33A set in the threshold setting unit 36D in the comparison unit 36F. As a result of the comparison by the comparison unit 36F, the application repair pattern selection unit 36C selects the dotted application repair pattern 45B when the length of the disconnection part 33A is equal to or smaller than the threshold value, and the linear application repair pattern when the length is larger than the threshold value. Select 45A. For example, as shown in FIG. 5A, in the case where the length of the disconnection portion 33A is short enough for up to two dot-like coatings, the dot repair is automatically performed by the coating repair pattern selection unit 36C. As shown in FIG. 5B, when the length is longer than two, linear coating is automatically selected.

  The control device 36 drives the moving device 28 and the discharge device 25 so as to apply and repair the disconnection portion 33A according to the application repair patterns 45A and 45B selected by the application repair pattern selection unit 36C and the determined application repair conditions and program. Control is performed to repair the disconnection portion 33A.

  Also, in this case, settings such as the position of the application start point and the application end point, which were performed by the operator when performing manually, are acquired using an image processing technique. Here, a case where the application start point is set on the end portion of the pattern 33 located on the start end side of the disconnection portion 33A will be described with reference to FIG.

  First, the control device 36 sets a scanning area E in an image captured by the CCD camera 35. The scanning area E has a size capable of capturing the end of the disconnection portion 33A, and is set so that the center thereof is located at the position of the start end of the disconnection portion 33A sent from the disconnection inspection device 41.

  If the scanning area E is set, the scanning area E is sequentially scanned in the horizontal direction while shifting one pixel at a time from the upper side to the lower side. At this time, the edge of the pattern 33 is detected for each scan, and the width dimension of the pattern 33 is acquired from the detected value. Of the acquired width dimensions, the scanning position where the width dimension that is closest to the value of 1 / n of the width of the pattern 33 applied with an appropriate application amount is obtained. The intersection of the obtained scanning line at the scanning position and the center line of the pattern 33 is set as the coordinates of the application start point.

  The application end point of the disconnection portion 33A can be performed in the same manner.

  In addition, since the operation | movement which repairs the disconnection part 33A is the same as the operation | movement demonstrated using FIG. 5 (A)-(C) in the case of manual operation, description is abbreviate | omitted.

  Next, the setting of the gap between the tip of the nozzle 26 and the top surface of the substrate 16 in the case of repairing a coating defect portion that has been disconnected while leaving the island portion 33D having a low coating height in the disconnection portion 33A will be described.

  As described with reference to FIG. 6A in the background art, when the gap control of the nozzle 26 is performed using the laser displacement meter 34 during the coating repair work, the measurement point of the laser displacement meter 34 is already applied. By being positioned on the pattern 33, the applied amount of the pattern after repair may be excessive in the island portion 33D where the coating height is low.

  Therefore, as shown in FIG. 6B, in the island portion 33D, the gap control is not performed, the gap G0 just before application to the island portion 33D is maintained, and the gap control is resumed when the nozzle 26 passes through the island portion 33D. To do. The position information of the island portion 33D may be set as the application repair condition. When the gap G0 is set in this way, the gap between the tip of the nozzle 26 and the surface of the island portion 33D becomes small in the island portion 33D where the coating height is low, so that the discharge resistance when the sealant is discharged from the nozzle 26 is reduced. Larger and less discharge of sealant. By setting the gap in this way, it is possible to prevent the application amount from being excessive in the island portion 33D having a low application height, as shown in FIG.

  Further, when the measurement point of the laser displacement meter 34 is located on a straight line inclined by a predetermined angle in the XY direction with respect to the traveling direction of the nozzle 26 when viewed from the nozzle 26, the corner portion of the pattern 33 or near the corner portion. When repairing the disconnected portion 33 </ b> A, the measurement point of the laser displacement meter 34 may be located on the pattern 33 or may cross the pattern 33.

  Even in such a case, it is conceivable that an excessive amount of coating occurs due to an increase in the gap.

  Therefore, outside the corner portion of the pattern 33, for example, at a point Q (FIG. 4A) where the extension line of the center line of the pattern 33 along the X direction and the extension line of the center line of the pattern 33 along the Y direction intersect. The height of the surface of the substrate 16 is measured and stored before performing the coating repair work, and when performing the coating repair work, gap control is performed based on the stored measurement value. Here, the height of the surface of the substrate 16 at the point Q (FIG. 4A) can be obtained from the measured value of the laser displacement meter 34 and the position information of the Z table 23.

  By doing so, it is possible to prevent an excessive amount of coating that may occur when the measurement point of the laser displacement meter 34 is positioned on or crosses the pattern 33.

  According to the present embodiment, the following operational effects can be obtained.

  (a) The application repair pattern 45A or 45B when applying and repairing the disconnection portion 33A of the pattern 33 drawn and drawn is selected, and the disconnection portion 33A is applied and repaired by the selected application repair pattern 45A or 45B. Therefore, the disconnection portion 33A can be repaired with the application repair patterns 45A and 45B that match the state of the disconnection portion 33A. As a result, the broken portion can be repaired satisfactorily with a necessary coating amount, and the occurrence of defects can be prevented. Therefore, the productivity of the liquid crystal display panel can be improved.

  (b) The paste application apparatus 10 includes a position setting unit 36A for setting a position for applying and repairing the disconnection portion 33A of the pattern 33 drawn and drawn. The application repair pattern selecting unit 36C is set by the position setting unit 36A. Since the application repair pattern 45 is selected for each position, even if the pattern 33 has a plurality of disconnection portions 33A, repair is performed with the application repair patterns 45A and 45B that match the state of the disconnection portion 33A for each disconnection portion 33A. Can do. As a result, the plurality of disconnected portions 33A can be repaired satisfactorily with a necessary coating amount, and the occurrence of defective products can be prevented.

  (c) The application repair pattern 33 when applying and repairing the disconnected portion 33A of the drawn pattern 33 is either a linear application repair pattern 45A or a dotted application repair pattern 45B. As described in the embodiment, even when the surface of the substrate 16 is difficult to adhere to the sealing agent, when the sealing agent is applied with the dotted application repair pattern 45B, the coating repair pattern 45A on the line is used. The sealing agent can be adhered more stably than when the sealing agent is applied. Therefore, the reliability of the coating repair can be improved by selecting either the linear coating repair pattern 45A or the dot-shaped coating repair pattern 45B according to the state of the disconnected portion 33A of the pattern 33.

  (d) The paste application apparatus 10 inputs the information on the length of the disconnection portion 33A, and repairs the disconnection portion 33A with the linear application repair pattern 45A or repairs it with the dotted application repair pattern 45B. A threshold setting unit 36D for setting a threshold for selecting whether or not to compare the length of the disconnection portion 33A with the threshold value, and repair the disconnection portion 33A with a linear coating repair pattern 45A or Since it is selected whether the repair is performed with the coating repair pattern 45B and the disconnection portion 33A is coated and repaired, the coating repair work can be performed automatically. For this reason, the coating repair work can be performed efficiently.

  (e) The paste application device 10 includes a disconnection detection device 41 for detecting the disconnection portion 33A of the pattern 33 drawn and drawn, and the input unit 36B of the paste application device 10 determines the pattern 33 from the detection result of the disconnection detection device 41. The information regarding the length of the disconnection portion 33A is obtained. That is, since the detection work of the disconnection part 33A is performed in parallel with the application work in the paste application device 10, the repair work of the disconnection part 33A can be efficiently performed.

  (f) When the length of the disconnection portion 33A is a short one that is equal to or less than the threshold value, the dot-shaped application repair pattern 45B is selected and repaired. Therefore, as described in the above-described embodiment, the necessary coating amount is required even in the case of the short disconnection portion 33A, which may have occurred because the surface of the substrate 16 is difficult to adhere to the sealing agent. Can be applied and repaired well. Further, when the length of the disconnection portion 33A is longer than the threshold value, the linear coating repair pattern 45A is selected and repaired, so that the repair work can be performed efficiently.

(Second Embodiment)
In the first embodiment, the disconnection inspection device 41 is used as the disconnection detection device, and the disconnection portion 33A is detected in the subsequent process of the paste coating device 10. However, in this embodiment, the disconnection detection device is added to the paste coating device 10. is there. FIG. 3 shows an example in which a distance detector comprising a laser displacement meter 51 is used as a disconnection detection device, and the laser displacement meter 51 is arranged behind the nozzle 26 in the traveling direction. The coating height of the pattern 33 of the sealing agent applied while applying to is measured.

  The coating height of the sealant pattern 33 can be obtained from the difference between the distance between the laser displacement meter 51 and the substrate 22 measured in advance and the distance between the laser displacement meter 51 and the pattern 33. it can.

  Although not shown in FIG. 3, this example also includes a laser displacement meter 34 for performing gap control as in the first embodiment.

  The control device 36 in the coating apparatus compares the height of the pattern 33 measured by the laser displacement meter 51 with a preset height threshold and detects the presence or absence of the disconnection portion 33A or a portion with a low coating height. . When the coating height is equal to or lower than the threshold value, it is possible to detect that a disconnection or a portion with a low coating height has occurred.

  The nozzle 26 bends 90 degrees to one side of the traveling direction at each of the four corners in order to apply and draw the pattern 33 in a square frame shape. Therefore, as shown in FIG. 7, when the laser displacement meter 51 is arranged so that the measurement points 51a of the laser displacement meter 51 are equally positioned around the nozzle 26 at four locations, and the nozzle 26 is bent at a corner. It is good to switch so that it may measure with the laser displacement meter 51 located in the back of the nozzle 26. FIG. In this case, each laser displacement meter 51 is arranged on the Z table 23 at a position away from the nozzle 26, and the light projecting portion and the light receiving portion of each laser displacement meter 51 are guided to the vicinity of the nozzle 26 using an optical fiber. Then, the height of the pattern 33 can be measured without arranging the relatively bulky laser displacement meter 51 around the nozzle 26. Also, four sets of optical fibers are connected to the light projecting portion and the light receiving portion of the single laser displacement meter 51 via an optical path switch, and each set of optical fibers is equally distributed around the nozzle 26 at four locations. However, if the set of optical fibers is switched and used by using the optical path switch, four locations can be measured by one laser displacement meter 51, so that the configuration of the disconnection detection device can be simplified. it can.

  Further, the laser displacement meter 51 is rotatably mounted around the syringe 27, and the laser displacement meter 51 is rotated around the syringe at the corner so that the laser displacement meter 51 is always located on the rear side in the traveling direction of the syringe. Then, the laser displacement meter 51 can always measure the pattern 33 that has been applied and drawn.

  Although the application height of the pattern 33 of the sealant applied in parallel with the application of the sealant was measured, the application height of the pattern 33 was measured independently after the application of the sealant was completed. Also good.

  Further, the laser displacement meter 51 for measuring the height of the sealant pattern 33 may also be used as the laser displacement meter 34 for gap control. In this case, unlike the case where the laser displacement meter 51 and the laser displacement meter 34 are provided separately, the coating height of the pattern 33 cannot be measured in parallel with the coating of the pattern 33, but the laser displacement meter Therefore, the configuration of the paste coating apparatus 10 can be simplified.

  According to the present embodiment, in addition to the effects (a) to (d) and (f) of the first embodiment, the following operational effects can be obtained.

  (g) Since the disconnection detecting device of the paste applying apparatus 10 includes the laser displacement meter 51 that measures the height of the sealant discharged from the nozzle 26 of the applying apparatus and applied onto the substrate 16, the paste applying apparatus 10 itself Thus, it is possible to detect disconnection, and it is not necessary to provide a disconnection detection device separately, and the installation space for the device can be reduced accordingly.

  (h) When the application defect portion of the application pattern 33 is detected based on the application height of the sealing agent, the application defect of the disconnection portion 33A or the like is compared with that based on the application width of the seal agent for the following reason. The detection accuracy of the part increases. When the application amount of the sealant is reduced because the gap between the tip of the nozzle 26 and the substrate 16 is smaller than the set amount, the applied sealant has a lower application height by the smaller gap. turn into. On the other hand, the application width becomes relatively wide because the nozzle 26 crushes the sealant. In other words, you want to flatten. Then, even if the application amount is small, the application width is not much different from the pattern 33 applied with the required application amount. Therefore, it is difficult to determine whether or not the application amount is sufficient (whether or not it is defective) by comparing the application widths. On the other hand, since the coating height is sufficiently different from the required amount of coating height, the quality of the coating amount can be accurately determined.

  Further, the same procedure as that by the disconnection inspection measure 41 is performed by using an imaging device such as a CCD camera instead of the laser displacement meter 34 used in Example 2 and imaging the pattern 33 immediately after coating by the CCD camera. Thus, the application defect portion of the pattern 33 can also be detected.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention. For example, only when the application repair operation of the application defect portion of the pattern 33 is automatically performed, the length of the disconnection portion 33A is compared with the threshold value, and the application repair pattern selection unit 36C performs a linear application repair pattern 45A or a dot-like pattern. The application repair pattern 45B is automatically selected. However, when the application repair work is performed manually, the length of the disconnection part 33 is input to the input part 36B using the keyboard 47 or the like, and is manually input. The length of the disconnection part 33A may be compared with a threshold value, and the linear repair repair pattern 45A or the spot repair repair pattern 45B may be automatically selected by the repair repair pattern selector 36C.

  Moreover, although the Example demonstrated the application repair of the disconnection part mainly, it cannot be overemphasized that the application | coating defect part by having few application | coating amounts other than a disconnection part may be sufficient. In addition, when repairing the coating defect part with a small coating amount, the discharge amount of the sealing agent from the nozzle 26 is set to be smaller than when repairing the disconnection part 33A. For example, when repairing an application defect portion where the sealant is applied only at half the application amount, the discharge amount of the sealant from the nozzle 26 is set to half of the discharge amount when repairing the disconnected portion 33A. Condition.

  Moreover, although the example which repaired the long disconnection part 33A only with the linear application | coating repair pattern 45A was demonstrated, when the part with bad adhesiveness of a sealing agent exists in the middle of the disconnection part 33A, the part Only the point-shaped application repair pattern 45B may be repaired. In this way, even when there is a part with poor adhesion of the sealing agent in the middle of the long disconnection part 33A, the reliability of the coating repair is improved as described in the first embodiment.

  Further, the condition for repairing with the dot-shaped coating repair pattern 45B is a case where the length of the broken portion 33A is up to two point-shaped coatings, but may be three or more. In this case, the application pitch P may be set in advance in a storage unit (not shown) of the control device 36, and the application position of each point application may be set with the application pitch P stored between the application start point and the application end point. At this time, if the interval L between the application start point and the application end point cannot be divided by the set application pitch P, the quotient obtained by dividing the interval L by the integer closest to the quotient obtained by dividing the interval L by the application pitch is the new application pitch P. 'And good.

  Further, when there are a plurality of disconnection portions 33A in one pattern 33A drawn and drawn on the substrate 16, it may be set by switching whether the coating repair work is performed manually or automatically for each disconnection portion 33A. good.

  Moreover, although the discharge apparatus 25 demonstrated in one example, you may provide two or more. For example, two X tables 22a may be provided on the guide rail 21 shown in FIG. 1, and the discharge device 25 may be provided on each X table 22a.

  In addition, when the two discharge devices 25 are provided on the single guide rail 21, the two discharge devices 25 cannot be simultaneously positioned at different positions in the Y-axis direction. Then, when repairing by sharing the broken portions at different positions in the Y-axis direction in the two patterns 33, after repairing the broken portion 33A of one pattern 33 by one ejection device 25, the second pattern 33 is repaired. What is necessary is just to make it repair by the other discharge apparatus 25 of a disconnection part.

  If the two ejection devices 25 can move independently in the X and Y directions, the broken portions of the two patterns 33 can be repaired in parallel.

DESCRIPTION OF SYMBOLS 10 Paste coating device 16 Substrate 25 Discharge device 26 Nozzle 28 Moving device 33 Pattern 33A Disconnection part (application defect part)
34 Laser displacement meter (distance detector)
36 control device 36A position setting unit 36B input unit 36C application repair pattern selection unit 36D threshold setting unit 36F comparison unit 41 disconnection inspection device (disconnection detection device)
45A Linear coating repair pattern 45B Dot coating repair pattern

Claims (8)

In a paste coating apparatus that discharges paste from a nozzle and coats and draws on a substrate with a preset pattern,
A moving device for relatively moving the nozzle and the substrate;
A discharge device for discharging the paste from the nozzle;
A coating repair pattern selection unit for selecting a coating repair pattern when coating and repairing a coating defect portion of the pattern drawn by coating; and
A paste coating apparatus comprising: the moving device and a control device that controls the discharge device so as to coat and repair the coating defect portion with the selected coating repair pattern. A position setting unit for setting information on the position of the application defect portion of the pattern drawn and applied;
The paste application device according to claim 1, wherein the application repair pattern selection unit selects the application repair pattern for each position set by the position setting unit.   The paste coating apparatus according to claim 1 or 2, wherein the coating repair pattern selection unit can select either a linear coating repair pattern or a dotted coating repair pattern. In a paste coating apparatus that discharges paste from a nozzle and coats and draws on a substrate with a preset pattern,
A moving device for relatively moving the nozzle and the substrate;
A discharge device for discharging the paste from the nozzle;
An input unit for inputting information on the length of the coating defect portion of the coating-drawn pattern;
A threshold setting unit for setting a threshold for selecting whether to repair the coating defect portion with a linear coating repair pattern or a point-shaped coating repair pattern;
A comparison unit that compares the length of the coating defect portion with the threshold based on information on the length of the coating defect portion of the pattern;
Based on the comparison result of the comparison unit, a coating repair pattern selection unit that selects whether the coating defect portion is repaired with the linear coating repair pattern or the point-shaped coating repair pattern, and
A paste coating apparatus comprising: a control device that controls the moving device and the discharge device so as to coat and repair the coating defect portion with the selected coating repair pattern. A disconnection detecting device for detecting a coating defect portion of the coating drawn pattern;
The paste application apparatus according to claim 4, wherein the input unit obtains information related to a length of an application defect portion of the pattern from a detection result of the disconnection detection apparatus.   The paste application device according to claim 5, wherein the disconnection detection device includes a distance detector that measures a height of a pattern ejected from the nozzle and applied and drawn on the substrate. In a paste application method in which a substrate and a nozzle that discharges paste on the substrate are relatively moved, and the paste is applied and drawn on the substrate in a preset pattern,
Based on the information on the length of the coating defect portion of the pattern drawn and drawn,
Select whether to repair the coating defect part with a linear coating repair pattern or to repair with a dotted coating repair pattern,
A paste coating method comprising coating and repairing the coating defect portion with the selected coating repair pattern. Set a threshold value for determining whether to repair the coating defect portion with a linear coating repair pattern or to repair with a dotted coating repair pattern,
The paste application method according to claim 7, wherein when the length of the application defect portion is equal to or smaller than the threshold value, the dot-shaped application repair pattern is selected, and when the length is larger than the threshold value, the linear application repair pattern is selected. .

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