JPH03217099A - Coating and inspecting method for adhesive - Google Patents

Abstract

PURPOSE:To automatically inspect a thread or a positional deviation of a coated adhesive which causes a problem and to coat with high reliability by coating an adhesive coating position on a board with adhesive by a coating nozzle, recognizing the position by image recognition means having a window at a predetermined position, and determining whether the coating state is satisfactory or not. CONSTITUTION:A circuit board 2 is positioned at a position directly under a coating nozzle 3, the nozzle 3 is moved down to the vicinity of the board 2, and discharges adhesive in a predetermined amount from its end. Then, a coating head 5 ls moved in a direction X, a television camera 4 is moved to a position directly above the coating position to recognize the shape of the coated adhesives 7. The profile line of the image of the coated adhesive 7 is extracted by image processing means which inputs an image signal from the camera 4 to determine whether it crosses the profile line of the window 6 or not.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an adhesive application inspection method used when applying an adhesive to a circuit board for temporarily fixing mounted electronic components.

Conventional TechnologyIn the process of mounting electronic components on a circuit board, prior to mounting the electronic components on the circuit board, an adhesive is applied to the circuit board to temporarily fix the electronic components until they are permanently fixed with solder, etc. There is a process of applying it.

Normally, when applying this adhesive, an adhesive applicator is used, which is configured to introduce high-pressure gas into the upper space of the application nozzle containing the adhesive and discharge the adhesive. A predetermined amount of adhesive is applied onto the surface by discharging it from a coating nozzle.

By the way, if this adhesive is not applied properly and stringy or misaligned, the adhesive will adhere to the electrodes of the circuit board, resulting in poor bonding. This will cause problems such as:

Therefore, in the past, images of the adhesive application positions were sequentially taken with a television camera and displayed on a monitor television, and an operator visually inspected the adhesive application positions to see if there was any stringiness or positional deviation.

However, the problem that the invention aims to solve is that the visual inspection as described above takes time and is extremely inefficient. In addition, frequent inspections are not possible, and on the other hand, stringiness can occur due to various factors such as outside air, temperature changes in the adhesive inside the application nozzle, dirt on the tip of the nozzle, and residual adhesive. There is a problem in that it is difficult to improve the reliability of adhesive application.

Although it is possible to inspect the adhesive application state by image processing the recognized image of the adhesive application position, it is relatively easy to calculate the area of the applied adhesive by processing the image data. However, it is extremely difficult to recognize whether the shape is appropriate or stringy.

In view of the above-mentioned conventional problems, the present invention provides an adhesive application inspection method that can realize highly reliable adhesive application by automatically inspecting the applied adhesive for problems such as stringiness and misalignment. The purpose is to

Means for Solving the Problems In order to achieve the above object, the present invention applies adhesive to an adhesive application position on a substrate using a coating nozzle, and detects the application position using an image recognition means having a window at a predetermined position. Recognized,
The present invention is characterized in that the quality of the applied adhesive is judged based on whether or not the shape of the applied adhesive protrudes from the window.

According to the above-described structure of the present invention, if the applied adhesive has stringiness or the application position is shifted and protrudes from the window, this is automatically detected by simple image data processing. By setting this window in such a way that it is possible to detect stringing and positional deviations that may cause problems during bonding in subsequent processes, highly reliable adhesive application is possible.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

First, the schematic configuration of the adhesive applicator will be explained with reference to FIG. 2.
A -Y table 1 is provided, and a circuit board 2 is fixed at a predetermined position on this XY table 1. Above the X-Y table 1, there is disposed a coating head 5 in which a dispensing nozzle 3 that can be elevated and a television camera 4 for image recognition of the shape of the applied adhesive are arranged side by side in the X direction. has been done. The coating head 5 is configured to be movable in the direction in which the coating nozzles 3 and the television camera 4 are arranged, that is, in the X direction.

Next, the process of applying adhesive to the circuit board 2 will be explained.

After the circuit board 2 is carried onto the X-Y table 1 by an appropriate conveyance means and fixed at a predetermined position, the X-Y table 1 is operated to position the adhesive application position directly below the application nozzle 3. The circuit board 2 is positioned as follows. circuit board 2
When the coating nozzle 3 is positioned, the coating nozzle 3 descends to the vicinity of the circuit board 2 and a predetermined amount of adhesive is discharged from its tip, and after discharging, the coating nozzle 3 rises to deposit a predetermined amount of adhesive onto the circuit board 2. is applied.

Next, the coating head 5 moves in the X direction, and the television camera 4
is located directly above the application position, and as shown in FIG. 1, the shape of the applied adhesive 7 can be recognized. An image processing means (not shown) to which an image signal from the television camera 4 is input is provided with a window 6 so as to surround an area where if the adhesive exceeds the area, it will affect subsequent processes. Further, images of the applied adhesive 7 and the window 6 are also displayed on a monitor television (not shown) as necessary. In the image processing means, the outline of the image of the applied adhesive 7 is extracted, and it is determined whether it intersects with the outline of the window 6 or not.

That is, when the applied adhesive 7 does not protrude from the window 6 as shown in FIG. 1(a), it is determined that the applied state is proper. On the other hand, if the applied adhesive 7 is stringy and protrudes from the window 6 as shown in FIG. 1(b), the outline lines intersect with each other, so that the stringing is detected. Further, as shown in FIG. 1(C), even if the coating position is shifted, it is detected in the same way.

In this way, the shape of the applied adhesive 7 is inspected using the window 6, and subsequent coating conditions are adjusted based on the inspection results.

This adhesive application and inspection may be performed when test application is performed on the test application area provided on each circuit board 2. In the main application process, the adhesive application and inspection may be performed on all application positions or on a fixed application area. You may do it every number of times.

In the above embodiment, a single circuit board 2 is positioned and fixed on an X-Y table 1, and a coating head 5 movable in the X direction
A coating nozzle 3 and a television camera 4 are arranged side by side in the X direction, and the coating head 5 is moved for each coating, each circuit board, or a predetermined number of coatings, and the adhesive is coated with the television camera 4. Although the configuration is such that the shape of the agent 7 is inspected, the productivity will be low if all coating locations are inspected.

Therefore, when performing a 100% inspection, as shown in FIG. Above the coating nozzle 3 and TV camera 4
are respectively fixed and arranged, and at the same time, the adhesive is applied to one circuit board 2 with the application nozzle 3, and at the same time, the shape of the adhesive applied on the other circuit board 2 is observed with the television camera 4.
It is preferable to configure the system so that it is recognized and inspected.

7 In this way, adhesive application and 100% inspection can be performed with high productivity.

Furthermore, an adhesive application device and an inspection device provided with an image processing means having a television camera and a window may be provided separately, and the inspection results may be fed back to the application device.

Effects of the Invention According to the present invention, if the shape of the applied adhesive protrudes from the window, it can be automatically detected by simple image data processing, and by setting the window appropriately, it can be detected in the subsequent process. It is possible to reliably and automatically detect stringing and positional misalignment, which can cause problems in the process, eliminating the need for visual inspection of defective coatings and preventing the occurrence of defective coatings due to omissions in inspections, resulting in highly reliable coatings. Adhesive application becomes possible.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, and FIG. 1 (
a), (b), and (C) are explanatory diagrams of the positional relationship between the applied adhesive and the window, FIG. 2 is a front view showing the schematic configuration of the adhesive coating device 8, and FIG. FIG. 2 is a front view showing a schematic configuration of an adhesive coating device in an embodiment of the present invention. Circuit board application nozzle TV camera window applied adhesive.

Claims (1)

[Claims] Adhesive is applied to the adhesive application position on the substrate using a coating nozzle, and the application position is recognized by an image recognition means having a window at a predetermined position, and whether the shape of the applied adhesive protrudes from the window or not is determined. An adhesive application inspection method characterized by determining whether the application state is good or bad.