JP2017144367A - Coating method and coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize a deviation between an amount to be coated at a change point with coating liquid and an amount actually coated at the change point with the coating liquid.SOLUTION: A coating method using a coating device 1 which coats a plurality of points on a printed circuit board P in the order with coating liquid Q for adhering parts onto the printed circuit board P includes: a specification process (S301) of specifying a change point as a coating point at which an amount different from an amount set at an immediately before coating point is set, from such coating amount data that an amount to be coated at each coating point with the coating liquid Q is associated with a coating order and set; a first correction process (S308) of correcting the amount set at the change point based on a first correction value in accordance with the amount and the amount set at immediately before coating point; and a coating process (S103) of coating the plurality of coating points with the coating liquid based on the coating data after the first correction process.SELECTED DRAWING: Figure 4

Description

  The technology disclosed in this specification relates to a coating method and a coating apparatus.

  Conventionally, in a coating method using a coating apparatus that sequentially applies a coating liquid for bonding a component to a substrate such as a printed circuit board to a coating point on the substrate, there is a technique that corrects in advance the amount of the coating liquid applied to the substrate It is known (see, for example, Patent Document 1).

  Specifically, in the coating method described in Patent Document 1, a syringe that discharges from a nozzle and applies it to a substrate by pressurizing a bond stored therein with air pressure, and moves the syringe in a horizontal direction with respect to the substrate And a plurality of syringes with different application amounts. One syringe applies the same amount of bond to multiple application points on the actual substrate, and the amount of bond application varies depending on differences in syringe movement distance and application timing. It reproduces the movement distance and application timing of the syringe when applying the bond to the actual substrate when applying, and the application amount applied to the application point where the application amount is rejected is corrected in advance. .

JP 10-32001 A

By the way, although the application method described in Patent Document 1 described above applies one amount of bond to a plurality of application points by one syringe, a different amount of application liquid is applied to a plurality of application points with one syringe. Sometimes you want to.
When different amounts of application liquid are applied to a plurality of application points with a single syringe, a change point that is an application point where an amount of application liquid different from the amount applied to the previous application point is applied. Conventionally, such a change point has not been sufficiently studied, and there is a possibility that the amount of the coating liquid to be applied to the change point and the amount of the coating liquid actually applied to the change point may be shifted.

  The present specification discloses a technique for reducing the difference between the amount of the coating liquid to be applied to the changing point and the amount of the coating liquid actually applied to the changing point.

  The coating method disclosed in this specification is a coating method using a coating apparatus that sequentially coats a plurality of coating points on the substrate with a coating solution for bonding components to the substrate, and the coating method is applied to each of the coating points. The amount of the applied liquid to be applied is changed from the application amount data set in association with the application sequence, and the change is the application point at which an amount different from the amount set at the immediately preceding application point is set A first step of specifying a point and correcting the amount set at the change point based on a first correction value according to the amount and the amount set at the immediately preceding application point A correction step; and an application step of applying the application liquid to the plurality of application points based on the application amount data after the first correction step.

When the coating liquid is discharged from the nozzle and applied to the coating point, the coating liquid remains at the tip of the nozzle in a state of protruding from the tip due to surface tension. The amount of the coating solution remaining in the protruding state is almost directly proportional to the amount applied.
By the way, when applying an amount of coating liquid of A to a certain coating point, the coating apparatus drives a pressure unit that pressurizes the coating liquid in the syringe and discharges it from the nozzle according to a control amount corresponding to A. Usually, the control amount corresponding to A is determined on the assumption that the amount of the coating liquid applied immediately before is also A. In other words, the control amount corresponding to A is determined on the assumption that the amount of coating liquid remaining at the tip of the nozzle remains at the tip of the nozzle when the amount of coating liquid of A is applied.
However, since an amount different from the amount set at the previous application point is set at the change point, when the amount A is set at the change point, the amount set at the previous application point Is not A. For this reason, the premise mentioned above collapses, and even if the pressurizing unit is driven according to the control amount corresponding to A, there is a possibility that the amount applied to the changing point does not become A. That is, there is a possibility that the amount of the coating liquid to be applied to the changing point and the amount of the coating liquid actually applied to the changing point may deviate.
According to the application method, the amount set at the change point is corrected based on the first correction value corresponding to the amount and the amount set at the immediately preceding application point. In this way, it is assumed that the amount of the coating liquid remaining at the tip of the nozzle when the coating liquid is applied to the immediately preceding coating point, and the tip of the nozzle when applying the coating liquid to the changing point. It is possible to correct a deviation caused by a difference from a certain amount (that is, an amount remaining when an application liquid of an amount set at a change point is applied). Thereby, the shift | offset | difference of the quantity of the coating liquid which should be apply | coated to a change point, and the quantity of the application liquid actually applied to a change point can be reduced.

  Further, following the first test application step of applying an amount of the coating liquid set at the application point immediately before the change point to a test substrate, and the first test application step, the change is performed. A second test application step of applying an amount of the application liquid set to a point to a test substrate, and detection of detecting the amount of the application liquid applied in the second test application step by a detection unit And a first correction value setting step of setting the first correction value based on a difference between the amount set at the change point and the amount detected in the detection step. .

  According to the above application method, the deviation caused by the difference in the amount of the coating liquid remaining at the tip of the nozzle can be corrected from the amount set at the change point and the amount set at the immediately preceding application point. A possible first correction value can be set.

  Further, a second correction step of correcting the amount set at the application point that is the continuous predetermined number of the application points following the change point and not the change point based on a second correction value is further provided. May be included.

Even if the amount set at the change point is corrected, the amount actually applied and the amount to be originally applied (that is, the amount before correction) may not match. In that case, there is a possibility that the amount of the application liquid applied to the application point subsequent to the change point is also deviated from the set amount.
According to the above application method, not only the change point, but also the prescribed number of application points following the change point and the application points that are not the change point are corrected for the amount set at the application point. Also, the deviation between the set amount and the actually applied amount can be reduced.

  In the second correction step, after the first correction step, a third test in which an amount of the coating solution set at the application point immediately before the change point is applied to a test substrate. Subsequent to the application step, the third test application step, the fourth test application step of applying the corrected amount of the application liquid set at the change point to the test substrate, and the fourth After the test application step, the step of applying the amount of the application liquid set at the application point immediately after the change point to the test substrate and the amount of the application liquid applied in the step are detected. Repeating the process of detecting by the part until the difference between the amount set at the immediately subsequent application point and the detected amount falls within the allowable range, and when the difference falls within the allowable range A prescribed number setting step for setting the prescribed number based on the number of times. But good.

  According to the above application method, it is possible to automatically determine the minimum specified number in which the deviation between the amount set at the application point following the change point and the amount actually applied is within the allowable range. Thus, it is possible to reliably correct the application point that needs to be corrected while avoiding unnecessary correction to the application point that does not require correction.

  In the second correction step, the continuous regulation following the change point is based on the difference between the amount set at the application point immediately after the change point and the amount detected in the repetition step. A second correction value setting step of individually setting the second correction value for each of the number of application points may be further included.

  According to the above control device, since the second correction value is individually set for each of the prescribed number of application points following the change point, the second correction value is uniformly set to the amount set for these application points. The correction can be made with higher accuracy than the correction based on the above.

  Further, the coating apparatus disclosed in this specification is a coating apparatus that sequentially applies a coating liquid for bonding components to a substrate to a plurality of coating points on the substrate, and includes a control unit, and the control unit includes: The amount of the application liquid applied to each application point is set based on the application amount data set in association with the application order, and an amount different from the amount set for the previous application point is set. Specific processing for identifying the change point that is the application point, and the amount set at the change point to a first correction value according to the amount and the amount set at the previous application point A first correction process based on the first correction process and an application process for applying the application liquid to the plurality of application points based on the application amount data after the first correction process are executed.

  According to the above-described coating apparatus, it is possible to reduce a deviation between the amount of the coating liquid to be applied to the changing point and the amount of the coating liquid actually applied to the changing point.

  According to the technology disclosed in the present specification, it is possible to reduce a deviation between the amount of the coating liquid to be applied to the changing point and the amount of the coating liquid actually applied to the changing point.

Top view of coating apparatus according to Embodiment 1 Side view of coating device Block diagram showing the electrical configuration of the coating device Schematic diagram showing an example of coating amount data Flow chart of application method Normal correction flowchart Schematic diagram showing the coating solution remaining at the tip of the nozzle after applying the coating solution for 20 milliseconds Schematic showing the coating solution remaining at the tip of the nozzle after applying the 40 millisecond coating solution The amount of change in the diameter of the coating solution when a coating solution of 40 milliseconds is applied after the coating solution of 20 milliseconds is applied, and the coating solution of 20 milliseconds after the application of the coating solution of 40 milliseconds. Showing the amount of change in the diameter of the coating solution when coating is continuously applied The change rate of the diameter of the coating liquid when the coating liquid of 40 milliseconds is applied after the coating liquid of 20 milliseconds is applied, and the coating liquid of 20 milliseconds after the coating liquid of 40 milliseconds is applied. Graph showing the rate of change in the diameter of the coating solution when applied continuously Flow chart of change point correction process The change rate of the diameter of the coating liquid when the coating liquid of 40 milliseconds is applied after the coating liquid of 20 milliseconds according to the second embodiment is applied, and 20 milliseconds after the coating liquid of 40 milliseconds is applied. A graph showing the rate of change of the diameter of the coating liquid when the coating liquid is applied Flow chart of application method Flow chart of application point correction process

<Embodiment 1>
The first embodiment will be described with reference to FIGS. In the following description, the left-right direction shown in FIG. 1 is called the X-axis direction, the front-rear direction is called the Y-axis direction, and the direction perpendicular to the paper surface in FIG.

(1-1) Configuration of Coating Device The coating device 1 according to the present embodiment includes a base 11, a pair of conveyors 12, a head transport unit 13, a head unit 14, and an air supply circuit 15 illustrated in FIG. A substrate recognition camera 16 (an example of a detection unit) shown in FIG. 2 is provided.

  As shown in FIG. 1, the base 11 has a rectangular shape in plan view and has a flat upper surface. In FIG. 1, a rectangular frame P indicated by a two-dot chain line indicates a printed circuit board (an example of a circuit board) located at a work position when the coating liquid Q (see FIG. 7) is applied.

  The pair of conveyors 12 is disposed at a substantially central position of the base 11 in the Y-axis direction, and extends in the X-axis direction. The rear conveyor 12 is arranged so as to be movable in the Y-axis direction with respect to the front conveyor 12, and the operator can adjust the interval between the two conveyors 12 according to the size of the printed board P. The printed circuit board P is carried into a work position on the base 11 by a pair of conveyors 12 from one side (right side in FIG. 1) in the X-axis direction, stopped at the work position and coated with the coating liquid Q, and then a pair of It is carried out by the conveyor 12 to the other side (left side in FIG. 1).

  The head transport unit 13 transports the head unit 14 in the X axis direction and the Y axis direction within a certain movable region. The head transport unit 13 includes a pair of Y-axis guide rails 17 extending in the Y-axis direction, a Y-axis ball screw 18, a Y-axis servo motor 19 that rotates the Y-axis ball screw 18 around the axis, a Y-axis ball nut 21, and an X-axis direction. A head support 20, an X-axis ball screw 22, an X-axis servo motor 23 for rotating the X-axis ball screw 22 around the axis, an X-axis ball nut 24, and the like.

  The head support 20 is supported by the Y-axis guide rail 17 so that both ends in the X-axis direction are slidable. The Y-axis ball nut 21 is fixed to the head support 20 and is screwed into the Y-axis ball screw 18. When the Y-axis servo motor 19 is energized, the Y-axis ball nut 21 advances and retreats along the Y-axis ball screw 18 and the head support 20 moves in the Y-axis direction.

  The X-axis ball screw 22 and the X-axis servo motor 23 are supported by the head support 20. The X-axis ball nut 24 is fixed to the head unit 14 and is screwed into the X-axis ball screw 22. When the X-axis servomotor 23 is energized, the X-axis ball nut 24 advances and retreats along the X-axis ball screw 22, and the head unit 14 moves in the X-axis direction.

  The head unit 14 is for applying a coating liquid Q such as an adhesive or cream solder on the printed circuit board P. As shown in FIG. 2, the head unit 14 has two dispenser heads 25 for applying the coating liquid Q onto the printed circuit board P, a Z-axis servo motor 27, an R-axis servo motor 28, and the like.

  The two dispenser heads 25 are arranged side by side in the X-axis direction, and are respectively supported by the head unit 14 so as to be movable in the Z-axis direction and rotatable about the R-axis parallel to the Z-axis direction. The dispenser head 25 includes a syringe 25A for storing the coating liquid Q, and a nozzle 25B serving as a discharge port for the coating liquid Q in the syringe 25A, and compressed air supplied from the air supply circuit 15 (see FIG. 3) is supplied. In response to being introduced into the syringe 25A, the coating liquid Q is discharged from the nozzle 25B.

  The Z-axis servo motor 27 is for moving the dispenser head 25 in the Z-axis direction. The R-axis servo motor 28 is for rotating the dispenser head 25 in the R-axis direction.

  As shown in FIG. 3, the air supply circuit 15 is installed in the middle of the air supply 31 made of a compressor, the air pipe 31 for introducing the air supplied from the air supply source 30 into the syringe 25 </ b> A, and the air pipe 31. And a switching valve 32 made of a solenoid valve.

  As shown in FIG. 2, the board recognition camera 16 is provided at the lower end of the head unit 14 with the imaging surface facing downward. The board recognition camera 16 images the coating liquid Q applied to the printed board P.

(1-2) Electrical Configuration of Coating Device Next, the electrical configuration of the coating device 1 will be described with reference to FIG. As shown in FIG. 3, the coating apparatus 1 includes a control unit 33. The control unit 33 is connected to the Y-axis servo motor 19, the X-axis servo motor 23, the Z-axis servo motor 27, the R-axis servo motor 28, the board recognition camera 16, the switching valve 32, and the like.

  The control unit 33 includes a CPU, a ROM, a RAM, a storage unit, and the like. The CPU executes a control program stored in the ROM to control each part of the coating apparatus 1. The ROM stores a control program executed by the CPU. The RAM is used as a main storage device for the CPU to execute various processes. The storage unit is an external storage device such as a hard disk or a rewritable nonvolatile memory, and stores various data such as substrate data.

  The substrate data includes substrate information relating to the number of printed circuit boards P to be applied, application point data in which the coordinates of application points on the printed circuit board P are set in association with the application order, and application to each application point. The amount of coating liquid Q to be applied is set in association with the coating order. The description of the coating amount data will be described later.

  In the coating apparatus 1 configured as described above, during the automatic operation, the pair of conveyors 12 conveys the printed circuit board P to the work position on the base 11 and the printed circuit board P conveyed to the work position. The application state in which the application liquid Q is applied to the upper application point is alternately executed.

(1-3) Application Amount Data Next, the application amount data described above will be described with reference to FIG. Here, in the present embodiment, the amount of the coating liquid Q discharged from the nozzle 25B is almost directly proportional to the time during which the switching valve 32 is open. For this reason, in this embodiment, the amount of the coating liquid Q is represented by the time (milliseconds) for opening the switching valve 32.

  In FIG. 4, the leftmost amount indicates the amount of the coating liquid Q applied to the first application point, and indicates the amount of the coating liquid Q applied to the application point whose application order is slower toward the right. Yes. That is, in the application amount data according to this embodiment, the order from left to right corresponds to the application order.

(1-4) Application Method Using Application Apparatus As shown in FIG. 5, the application method according to the present embodiment includes a normal correction step (S101), a change point correction step (S102), and an application step (S103). Including. Note that the normal correction process and the change point correction process are not necessarily performed every time before the coating process, and are performed when the type of the printed circuit board P is switched in this embodiment.

(1-4-1) Normal Correction Step In the coating apparatus 1, the amount of the coating liquid Q set in the coating amount data and the amount of the coating liquid Q that is actually applied for various reasons such as changes with time. It may shift. The normal correction is to correct the application amount data so that the deviation between the amount set at the application point and the amount actually applied is reduced for each application point.

The normal correction process will be specifically described with reference to FIG.
In S201, the control unit 33 extracts the amount of the coating liquid Q from the coating amount data without overlapping. For example, in the application amount data shown in FIG. 4, a plurality of the same amount is set such as 2 for 10 milliseconds, 6 for 30 milliseconds, and the like when extracted without duplication, 10 milliseconds, 20 milliseconds, and 30 milliseconds. A total of four quantities are extracted: seconds and 40 milliseconds.

In S202, the control unit 33 selects one extracted amount.
In S203, the control unit 33 applies the selected amount of the coating liquid Q to the test printed board P. And the control part 33 images the coating liquid Q apply | coated to the printed circuit board P with the board | substrate recognition camera 16, produces | generates an image, analyzes the image, and judges the diameter of the coating liquid Q. And the control part 33 detects the quantity (millisecond) of the coating liquid Q actually apply | coated by converting the diameter into the time when the switching valve 32 was opened. The controller 33 repeats this for the selected amount a plurality of times, and detects the average value as the amount of the coating liquid Q actually applied for the selected amount.

In S204, the control unit 33 sets a value obtained by subtracting the selected amount from the amount detected in S203 as a correction value. For example, if the selected amount is 20 milliseconds and the detected amount is 21 milliseconds, 1 millisecond (the value obtained by subtracting the selected amount (20 milliseconds) from the detected amount (21 milliseconds) ( = 21 milliseconds-20 milliseconds) is set as the correction value.
In S205, the control unit 33 uniformly corrects all the selected amounts set in the application amount data to an amount obtained by subtracting the correction value from the selected amount. For example, in the case of the above-described example, the amount obtained by subtracting the correction value (1 millisecond) from the selected amount (20 milliseconds) is 19 milliseconds (= 20 milliseconds-1 milliseconds). All 20 milliseconds being corrected are uniformly corrected to 19 milliseconds.

  In S206, the control unit 33 determines whether or not all the extracted amounts have been selected. If all the amounts have been selected, the normal correction process is terminated. If there is an amount that has not yet been selected, the process returns to S202. Repeat the process.

(1-4-2) Change Point Correction Step First, change points will be described with reference to FIG. The change point refers to an application point at which an amount different from the amount set at the immediately preceding application point is set. For example, the amount of the coating liquid Q set at the second application point is 10 milliseconds and the amount of the coating liquid Q set at the third application point is 30 milliseconds. The second application point will be the change point. Similarly, the fifth, ninth, and eleventh application points are also changing points.

At the change point, even if the above-described normal correction is performed, there is a possibility that the difference between the set amount and the actually applied amount becomes large. This will be specifically described below.
FIG. 7 shows the coating liquid Q remaining at the tip of the nozzle 25B after applying the coating liquid Q for 20 milliseconds, and FIG. 8 shows the coating liquid Q remaining at the tip of the nozzle 25B after applying the coating liquid Q for 40 milliseconds. The coating liquid Q is shown. As can be seen from these figures, when the coating liquid Q is applied, the tip of the nozzle 25B remains in a state where the coating liquid Q protrudes due to surface tension, and the amount of the coating liquid Q remaining in the protruding state is the amount applied. Is almost directly proportional to.

  By the way, in the present embodiment, the time for opening the switching valve 32 to apply the coating liquid Q in the amount of A (that is, the control amount corresponding to A) is that the amount of the coating liquid Q applied immediately before is also A. It is decided on the assumption. In other words, the time is determined on the assumption that an amount of the coating liquid Q remaining at the tip of the nozzle 25B remains at the tip of the nozzle 25B when the amount of the coating liquid Q of A is applied.

  For this reason, for example, when the coating liquid Q is applied for 40 milliseconds after the coating liquid Q is applied for 20 milliseconds, the amount of the coating liquid Q remaining at the tip of the nozzle 25B is assumed (that is, 40). When the coating liquid Q is applied in an amount of millisecond, it is less than the amount remaining at the tip of the nozzle 25B, and the above-mentioned premise is broken, and the amount actually applied becomes smaller than the set amount.

  More specific description will be given with reference to FIGS. In FIG. 9, a solid line 34 indicates the amount of change in the diameter of the coating liquid Q when the coating liquid Q of 40 milliseconds is applied six times continuously after the coating liquid Q of 20 milliseconds is applied. Specifically, FIG. 9 shows the difference in the diameter of each coating liquid Q from the first to the fifth with respect to the diameter of the sixth coating liquid Q on the basis of the diameter of the coating liquid Q applied the sixth time. Yes. In FIG. 10, a solid line 35 indicates the ratio (change rate) of the diameter of each coating liquid Q from the first to the fifth to the diameter of the sixth coating liquid Q in%.

  In the example shown in FIG. 9 and FIG. 10, since the amount applied immediately before is 20 milliseconds, the amount of the coating solution Q applied for the first time is the amount of the coating solution Q applied at the change point. Equivalent to. On the other hand, the second to sixth times correspond to the amount of the coating liquid Q applied to the application point that is not the change point because the amount of the coating liquid Q applied immediately before is 40 milliseconds. As can be seen from these figures, the difference between the first time (ie, the change point) and the sixth time is about 0.05 mm (5%) smaller than the second time to the fifth time (application point that is not the change point). The difference from the 6th is large.

  On the contrary, for example, when the coating liquid Q is applied for 20 milliseconds after the coating liquid Q is applied for 40 milliseconds, the amount of the coating liquid Q remaining at the tip of the nozzle 25B is larger than the expected amount. As a result, the above-mentioned premise is broken and the amount actually applied becomes larger than the set amount.

  More specific description will be given with reference to FIGS. In FIG. 9, the dotted line 36 indicates the amount of change in the diameter of the coating liquid Q when the 20 millisecond coating liquid Q is applied six times continuously after the 40 millisecond coating liquid Q is applied. A dotted line 37 indicates a change rate of the diameter of the coating liquid Q when the coating liquid Q of 20 milliseconds is applied six times continuously after the coating liquid Q of 40 milliseconds is applied. As can be seen from these figures, the difference between the first time (change point) and the sixth time is about 0.08 mm (10%), compared to the second time to the fifth time (application point that is not the change point). The difference from the 6th is large.

  As described above, even if the above-described normal correction is performed at the change point, there is a possibility that the difference between the set amount and the actually applied amount becomes larger than the application point that is not the change point. The change point correction is to correct the application amount data so that the deviation between the amount set at the change point and the amount actually applied is reduced for each change point.

With reference to FIG. 11, the change point correction step will be specifically described.
In S301, the control unit 33 specifies a change point from the application amount data (an example of a specifying step).
In S302, the control unit 33 extracts the change patterns at the change points without overlapping. For example, in the case of the example shown in FIG. 4, “10 milliseconds to 30 milliseconds”, “30 milliseconds to 20 milliseconds”, “20 milliseconds to 40 milliseconds”, and “40 milliseconds to 30 milliseconds”. A total of four change patterns are extracted.

In S303, the control unit 33 selects one extracted change pattern.
In S304, the control unit 33 applies an amount of the coating liquid Q before the change in the selected change pattern to the test printed board P (an example of a first test application process). For example, when the selected change pattern is “20 milliseconds to 40 milliseconds”, the amount before the change is 20 milliseconds.
In S305, following the above-described S304, the control unit 33 applies the changed amount of the coating liquid Q in the selected change pattern to the printed circuit board P (an example of a second test application process). For example, when the selected change pattern is “20 milliseconds to 40 milliseconds”, the amount after the change is 40 milliseconds.

  In S306, the control unit 33 images the coating liquid Q applied in S305 with the substrate recognition camera 16, and detects the amount of the coating liquid Q actually applied (an example of a detection process).

  In S307, the control unit 33 sets a value obtained by subtracting the amount set at the changing point from the amount detected in S306 as a first correction value (an example of a first correction value setting step). For example, if the extracted change pattern is “20 milliseconds to 40 milliseconds” and the detected amount is 38 milliseconds, the amount (40 milliseconds) set as the change point from the detected amount (38 milliseconds). -2 milliseconds (= 38 milliseconds-40 milliseconds), which is a value obtained by subtracting (second), is set as the first correction value.

  In S308, the control unit 33 obtains the first correction value from the amount set for the change point for all the change points that match the change pattern selected by the change pattern. Correction is uniformly made to the reduced amount (an example of the first correction step). For example, in the case of the above-described example, the amount obtained by subtracting the first correction value (−2 milliseconds) from the amount (40 milliseconds) set at the changing point is 42 milliseconds [= 40 milliseconds − (− 2 milliseconds). Second)], the amount set for all change points whose change pattern matches “20 milliseconds to 40 milliseconds” is uniformly corrected to 42 milliseconds.

  In S309, the control unit 33 determines whether or not all the change patterns have been selected. If all the change patterns are selected, the change point correction process is terminated, and if there is a change pattern that has not yet been selected, S303. Return to and repeat the process.

(1-4-3) Application Step In the application step, the above-described conveyance state and application state are executed alternately, and the application liquid Q is applied to a plurality of printed circuit boards P. And in this application | coating state, the control part 33 opens the switching valve 32 according to the quantity (millisecond) set to application quantity data, and each quantity of application liquid Q set to application quantity data is each set. Apply to application point.

(1-5) Effect of Embodiment According to the coating apparatus 1 according to the first embodiment described above, the amount set at the change point is determined according to the amount and the amount set at the immediately preceding application point. Correction is performed based on the correction value of 1. In this way, the amount of the coating solution remaining at the tip of the nozzle 25B when the coating solution Q is applied to the immediately preceding coating point, and the tip of the nozzle 25B when applying the coating solution Q to the changing point. It is possible to correct the deviation caused by the difference from the amount assumed to be present (that is, the amount remaining when the coating liquid Q is applied in the amount set at the change point). Thereby, the shift | offset | difference of the quantity of the coating liquid Q which should be apply | coated to a change point, and the quantity of the application liquid Q actually applied to a change point can be reduced.

  Furthermore, according to the coating apparatus 1, since the first test coating process, the second test coating process, the detection process, and the first correction value setting process are executed, the amount set at the change point and the immediately preceding amount are set. From the amount set at the application point, it is possible to set a first correction value that can correct the deviation caused by the difference in the amount of the coating liquid Q remaining at the tip of the nozzle 25B.

<Embodiment 2>
Next, Embodiment 2 will be described with reference to FIGS.
A solid line 38 shown in FIG. 12 indicates a change rate of the diameter of the coating liquid Q when the coating liquid Q of 40 milliseconds is applied six times continuously after applying the coating liquid Q of 20 milliseconds. Indicates the change rate of the diameter of the coating liquid Q when the coating liquid Q of 20 milliseconds is applied six times continuously after the coating liquid Q of 40 milliseconds is applied.

  However, unlike FIG. 9 described above, the first point (that is, the change point) shown in FIG. 12 is the amount of the coating liquid after the amount set at the change point is corrected based on the first correction value. Q is applied. As shown in FIG. 12, even if the amount set at the change point is corrected, the amount actually applied and the amount to be applied (that is, the amount before correction set at the change point) are the same. It may not be exactly the same. In that case, there is a possibility that the amount of the coating liquid Q applied to the application point subsequent to the change point may also deviate from the set amount.

  Therefore, as shown in FIG. 13, the control unit 33 according to the second embodiment executes the application point correction step (S401) after the above-described change point correction step (S102) and before the application step (S103). . The application point correction step corrects the amount set at the application point for a predetermined number of consecutive application points following the change point (however, application points that are not change points) based on the second correction value. Is.

  By the way, as shown in FIG. 12, since the application point following the change point has a different rate of change, if the amount set at these application points is uniformly corrected based on the same second correction value, the correction point is corrected. There is a risk that the accuracy may decrease. Therefore, in the application point correction step, the control unit 33 individually sets a second correction value for each of the prescribed number of application points following the change point, and the second correction value is set to the application point for each application point. Correction is performed using the correction value.

(2-1) Application Point Correction Step The application point correction step will be specifically described with reference to FIG.
In S501, the control unit 33 selects one change pattern.
In S502, the control unit 33 applies an amount of the coating liquid Q before the change in the selected change pattern to the test printed board P (an example of a third test application process).

  In S503, following S502, the control unit 33 applies the amount of coating liquid Q after the change in the selected change pattern (that is, the amount after correction set at the change point) to the test printed board P (see FIG. Example of fourth test application step). This corresponds to the first application described above.

In S504, the control unit 33 sets 1 as an initial value to a variable i for counting the number of repetitions.
In step S <b> 505, the control unit 33 applies a coating liquid Q in an amount set at the application point immediately after the change point (that is, the same amount as the pre-correction amount set at the change point) to the test printed board P. (That is, apply the second and subsequent points).

In S <b> 506, the control unit 33 detects the amount of the coating liquid Q by imaging the coating liquid Q applied in S <b> 505 with the substrate recognition camera 16.
In S507, the control unit 33 determines whether or not the difference between the amount set at the application point immediately after the change point and the detected amount is within the allowable range. If the difference is not within the allowable range, the process proceeds to S508. If it is within the allowable range, the process proceeds to S509.
In S508, the control unit 33 adds 1 to the number of repetitions i, and returns to S505. S504 to S508 described above are an example of a repetition process.

In S509, the number obtained by subtracting 1 from the number of repetitions i when the above-described difference is within the allowable range is set as the specified number (an example of the specified number setting step).
For example, assume that the rate of change is the above-described difference, and the allowable range of the difference is ± 3%. In that case, the solid line 38 shown in FIG. 12 is within 3% in the second application. In this case, the number of repetitions i when the difference is within the allowable range is 1, and the number obtained by subtracting 1 from the number of repetitions i is 0, so 0 is set as the specified number. Accordingly, in this case, no correction using the second correction value is performed for any application point following the change point.

  The dotted line 39 is within 3% in the third application. In this case, the number of repetitions i when the difference is within the allowable range is 2, and the number obtained by subtracting 1 from the number of repetitions i is 1, so 1 is set as the prescribed number. In this case, correction using the second correction value is performed for the first one application point following the change point.

  In S510, the control unit 33 subtracts the amount set at the application point (that is, the same amount as the pre-correction amount set at the change point) from the amount detected at S506 for each specified number of application points. Thus, the difference is individually obtained, and the obtained difference is individually set as a second correction value to be applied to a specified number of application points following the change point (an example of a second correction value setting step).

  In S511, the control unit 33 performs second correction corresponding to each of the change points of the change pattern that matches the selected change pattern from the amounts set for the continuous prescribed number of application points following the change point. These amounts are corrected by subtracting the values (an example of a second correction step).

  In S512, the control unit 33 determines whether or not all the change patterns have been selected. If all the change patterns are selected, the application point correction process is terminated, and if there is a change pattern that has not yet been selected, S501. Return to and repeat the process.

(2-2) Effects of the Embodiment According to the coating apparatus according to the second embodiment described above, not only the change point but also a specified number of application points following the change point are corrected based on the second correction value described above. Therefore, it is possible to reduce a deviation between the set amount and the actually applied amount for the prescribed number of application points.

  Furthermore, the coating apparatus according to the second embodiment can automatically determine the minimum specified number in which the deviation between the set amount and the actually applied amount is within the allowable range. Thus, it is possible to reliably correct the application point that needs to be corrected while avoiding unnecessary correction to the application point that does not require correction.

  Furthermore, according to the coating apparatus according to the second embodiment, the second correction value applied to the specified number of coating points following the change point is individually set, so that the amount set for these coating points is uniformly set. As compared with the case where correction is performed based on the same second correction value, correction can be made with higher accuracy.

<Other embodiments>
The technology disclosed in this specification is not limited to the embodiments described with reference to the above description and the drawings. For example, the following embodiments are also included in the technical scope.

(1) In the above embodiment, the case where the change point correction step S102 is performed when the type of the printed circuit board P is switched has been described as an example. On the other hand, the first correction value may be obtained for each assumed change pattern (or for each assumed change pattern and each type of coating liquid Q) regardless of the type change. In the change point correction step S102, the amount set at the change point may be corrected based on the first correction value corresponding to the change pattern of the change point.
Alternatively, the first correction value corresponding to each change pattern may be fixedly stored in the storage unit at the factory shipment stage, or the first correction value corresponding to each change pattern may be acquired from an external computer. It may be configured to.

  (2) In the above embodiment, the case where the amount of the coating liquid Q is adjusted by adjusting the time for opening the switching valve 32 has been described as an example. On the other hand, for example, the amount of the coating liquid Q may be adjusted by changing the pressure of the compressed air while always keeping the switching valve 32 open.

  (3) In the second embodiment, the case where the specified number is set by executing the repetitive steps (S504 to S508) has been described as an example. On the other hand, the prescribed number may be fixedly stored in the storage unit at the time of factory shipment, or the user may arbitrarily set the prescribed number by operating the operation unit.

DESCRIPTION OF SYMBOLS 1 ... Application | coating apparatus, 13 ... Head conveyance part, 15 ... Air supply circuit, 16 ... Board | substrate recognition camera (an example of a detection part), 25 ... Dispenser head, 25A ... Syringe, 25B ... Nozzle, P ... Printed circuit board, Q ... Application | coating liquid

Claims (6)

A coating method using a coating apparatus for sequentially coating a plurality of coating points on the substrate with a coating liquid for bonding components to the substrate,
An amount different from the amount set at the previous application point is set from the application amount data in which the amount of the application liquid applied to each application point is set in association with the application order. A specific step of identifying a change point that is the application point;
A first correction step of correcting the amount set at the change point based on a first correction value according to the amount and the amount set at the immediately preceding application point;
An application step of applying the application liquid to the plurality of application points based on the application amount data after the first correction step;
A coating method comprising: A first test application step of applying an amount of the application liquid set at the application point immediately before the change point to a test substrate;
Subsequent to the first test application step, a second test application step of applying an amount of the application liquid set at the change point to a test substrate;
A detection step of detecting the amount of the coating liquid applied in the second test application step by a detection unit;
A first correction value setting step for setting the first correction value based on the difference between the amount set at the change point and the amount detected in the detection step;
The coating method according to claim 1, further comprising:   A second correction step of correcting, based on a second correction value, an amount set for the application point that is a predetermined number of the application points that follow the change point and is not a change point; The coating method according to claim 1 or 2. The second correction step includes
After the first correction step, a third test application step of applying an amount of the application liquid set at the application point immediately before the change point to a test substrate;
Subsequent to the third test application step, a fourth test application step of applying the corrected amount of the application liquid set at the change point to a test substrate;
After the fourth test application step, a step of applying an amount of the application liquid set at the application point immediately after the change point to a test substrate, and a step of applying the application liquid applied in the step Repeating the step of detecting the amount by the detection unit until the difference between the amount set at the immediately subsequent application point and the detected amount is within an allowable range, and
A prescribed number setting step for setting the prescribed number based on the number of repetitions when the difference is within an allowable range;
The coating method according to claim 3, comprising:   In the second correction step, based on the difference between the amount set at the application point immediately after the change point and the amount detected in the repetition step, the predetermined number of continuous values following the change point The coating method according to claim 4, further comprising a second correction value setting step of individually setting the second correction value for each coating point. A coating apparatus for sequentially coating a plurality of coating points on the substrate with a coating liquid for bonding components to the substrate,
With a control unit,
The controller is
An amount different from the amount set at the previous application point is set from the application amount data in which the amount of the application liquid applied to each application point is set in association with the application order. A specific process for specifying a change point that is the application point;
A first correction process for correcting the amount set at the change point based on a first correction value according to the amount and the amount set at the immediately preceding application point;
An application process for applying the application liquid to the plurality of application points based on the application amount data after the first correction process;
Performing the coating device.

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