JPH049705A - Judging method for clogging of application nozzle - Google Patents

Abstract

PURPOSE:To judge whether or not a nozzle is clogged in a wide range of the state from where an applied pattern is not present at all to where the applied amount of the pattern is insufficient even if the number of the applied patterns is changed by measuring the sum of the area of a plurality of the applied patterns through image processing and comparing the sum with a reference value. CONSTITUTION:An applied pattern 3 on a circuit substrate 2 illuminated by an illuminating device 1 is photographed by a camera 4. When an image taken by the camera 4 is processed by an image processor 5, it is detected whether an application nozzle is clogged. In other words, the presence or absence of the applied pattern is detected first. Thereafter, the size of the applied pattern is measured and compared with a reference size. Moreover, if the applied amount is insufficient although the applied pattern by each nozzle is present, the individual area of each applied pattern is compared with a reference value. Accordingly, it becomes possible to judge a plurality of nozzles as to whether they are clogged.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for determining whether a nozzle for applying an adhesive for fixing a circuit board and an electronic component is clogged in the field of mounting electronic components.

2. Description of the Related Art Conventionally, the following method is known as a method for determining clogging of this type of coating nozzle.

(1) Nozzle clogging is determined by determining the presence or absence of an applied pattern through image processing using a camera or the like.

(2) The number of coated patterns is determined by image processing using a camera, etc., and compared with the reference number (
An example of a determination formula (Table 1) is used to determine whether a nozzle is clogged.

Table 1 Problems that the invention aims to solve However, the above method requires an increase in the amount of coating.

If the number of coating patterns changes due to reduction, stringiness, etc., it is difficult to determine the nozzle tip υ of only a few of the multiple nozzles, and there are still coating patterns from all coating nozzles. However, it is impossible to determine the nozzle blockage for a nozzle that is causing an insufficient coating amount.

An object of the present invention is to determine whether a nozzle is clogged in a wide range from a state where there is no application pattern to a state where an insufficient amount of application occurs even when the number of application patterns changes.

Means for Solving the Problems Therefore, in the nozzle block determination method of the present invention, after determining the presence or absence of a pattern (first step), the dimensions of the pattern are measured and compared with reference dimensions (second step).
Furthermore, if there is a coating amount insufficient even if there are coating patterns by each nozzle, the individual area of each coated pattern is compared with the reference value (third step) to determine whether the coating is applied by multiple nozzles. In other words, it determines.

Operation According to the above method, if all of the plurality of application nozzles are clogged, the nozzle blockage can be determined by the pattern presence/absence determination in step 1. Further, if only some of the plurality of coating nozzles cause tamping and the nozzles causing tamping do not apply at all, nozzle tamping can be determined by pattern size determination in step 2.

Furthermore, if some of the plurality of nozzles are lacking in coating amount, clogging of the nozzles can be determined by pattern individual area determination in step 3.

As described above, even if the number of patterns changes, it is possible to always determine whether or not the pattern is complete.

Example An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of a coating nozzle clogging determination apparatus of this embodiment, FIG. 2 is a flowchart of a coating nozzle clogging determination method of this embodiment, and FIG. 3 is a supplementary explanatory diagram.

The outline of the nozzle clogging determination device of this embodiment will be explained using FIG. A coating pattern 3 on a circuit board 2 illuminated by an illumination device 1 is imaged by a camera 4. The image captured by the camera 4 is processed by the image processing device 6 to determine if the coating nozzle is clogged.

Now, Fig. 2 shows the method for determining clogging of the application nozzle in the example.
This will be explained using FIG. As pre-processing, data such as nine types of coating pattern positions are input into the image processing device 5 as a coating nozzle clogging determination device. A window 17 is set within the camera screen so that the application pattern 3, which is the object to be recognized, is included (step 6).

The illumination device 1 illuminates, and the camera 4 captures the number of images (step 7).

Then, in the window 17 set in (Step 6), 18, −-dimensional luminance data is read out passing near the center of the coating pattern.Step 8) Among the points 19 to 22 whose luminance changes with respect to position, Then, point 19 where the amount of change is positive
．． 21 and the points 20 and 22 having a negative amount of change are set as edge bears, and among the edge bears, the edge bear 19 and 22 having the largest interval is set as the size 16 of the coating pattern (step 9).

If the coating pattern size 16 cannot be determined here, it is determined that there is only one nozzle in the pattern presence/absence determination (step 1o). Further, by comparing and judging the dimension 16 of the coating pattern and the dimension serving as a reference value (see Table 2 as an example of the judgment formula), pattern size judgment step 11) is performed to judge the nozzle holder. Edgebear 1 with the above coating pattern
Using the point determined in 9.22 as a starting point, the boundary of the coating pattern is traced, and the total area of each individual coating pattern is measured (step 12).

The quotient of the reference total area divided by the number of nozzles is set as the nozzle reference area (Step 13), and the nozzle reference area is compared and judged with the smallest value among the pattern individual areas (an example of the judgment formula, Table 3). Accordingly, pattern individual area determination (step 14) is performed to determine the nozzle tab 9. If it is determined that the nozzle is clogged, error processing is performed (step 15).

Table 2 Effects of the Invention As described above, according to the present invention, when all of the plurality of nozzles are causing blockage, or when several nozzles among the plurality of nozzles are causing blockage, Also, it is possible to judge a wide range of nozzle toe υ (from no pattern being applied at all to a state where the nozzle is applying but the amount is insufficient) without depending on the number of applied patterns. It has the effect of being able to

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a coating nozzle clogging determination device according to an embodiment of the present invention, FIG. 2 is a flowchart of a method for determining coating nozzle clogging according to this embodiment, and FIG. 3 is an explanatory diagram. . 1...Lighting device, 2...Circuit board, 3
. . . Applied pattern, 4 . . . Camera, 5 . . . Image processing device. Name of agent: Patent attorney Shigetaka Awano and one other person (α
) Chart Chart Chart Brightness

Claims (4)

[Claims] (1) A coating nozzle clogging determination method in which the total area of a plurality of coated patterns is measured by image processing and compared with the total area serving as a reference value to determine if the coating nozzle is clogged. (2) A method for determining clogging of a coating nozzle, in which the individual areas of a plurality of coated patterns are measured by image processing and compared with a reference individual area to determine whether the coating nozzle is clogged. (3) A method for determining clogging of a coating nozzle according to claim 2, wherein the total area serving as a reference for a plurality of patterns to be coated is divided by the number of nozzles, and clogging of a nozzle is determined using this value as an individual area serving as a reference value. (4) A first step of determining the presence or absence of multiple applied patterns through image processing, a second step of measuring the dimensions of the multiple patterns and comparing them with reference dimensions, and measuring the individual areas of the multiple patterns. A method for determining whether a coating nozzle is clogged, which includes a third step of comparing and determining the area with the individual area serving as a reference value.