JP3511636B2 - Board inspection method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a visual inspection of a printed circuit board in each step such as a raw board inspection, a post-printing inspection, a component mounting inspection, and a reflow inspection in the mounting process of a printed circuit board for an electronic circuit. The present invention relates to an inspection data creating method for creating data for an automatic inspection device.

[0002]

2. Description of the Related Art In recent years, as the density of printed circuit boards for electronic circuits has increased and the number of bonding points has increased, it has become difficult to perform manual inspections in the mounting process. Efforts are underway. The resolution of one screen of a visual recognition device which is generally used at present is about 512 pixels in the horizontal direction and 480 pixels in the vertical direction. In order to recognize a defect such as a deviation with sufficient accuracy, it is necessary to divide the entire substrate into several tens to hundreds of tens of screens for recognition. Therefore, in the conventional technique, the inspection screen is determined by dividing the entire substrate into a grid shape according to the size of the visual field of the camera as shown in FIG. Also, in in-line inspection, the inspection time per board must be shorter than the production takt time of the whole line, so the visual inspection equipment currently in practical use uses multiple visual recognition devices to provide multiple inspection screens. The inspection tact is shortened by performing the inspections in parallel.

[0003]

However, in the inspection screen dividing method as described above, even an area in the board where no inspection portion exists is included in the inspection screen as it is, so that the total number of inspection screens is increased. Time was getting longer. Further, in the above method, the number of inspection points for each inspection screen varies, and the inspection time of the inspection screen with the most inspection points becomes the completion time of the parallel processing. Was becoming. In addition, there is a problem that the inspection location which is near the boundary line of the grid and extends over the two inspection screens is not yet inspected.

In view of the above problems, the present invention reduces the number of inspection screens by freely setting the inspection screen position and reduces the variation in the number of inspection points among the inspection screens, thereby performing inspection in a short inspection time. The present invention provides a method of creating inspection data that can be performed and that can prevent the occurrence of uninspected locations in advance.

[0005]

In order to solve the above problems, the inspection data creating method according to claim 1 of the present invention comprises a step of creating a row by vertically dividing the entire substrate at equal intervals, and an inspection. Inside the set inspection screen, the process of rearranging the position data of the place in order from the top of the board, the process of setting the inspection screen so that the top inspection place is included in the upper part of the screen for each column. The inspection point data is registered.

Furthermore, test data creation method according to claim 1 of the present invention, for each number of the recognition device can be concurrently processed,
Determining whether the result of subtracting the number of inspection points on the lower inspection screen from the number of inspection points on the upper inspection screen between adjacent inspection screens is within a certain value, and the result of the subtraction is more than a certain value In the case of, a process is provided in which, of the inspection points included in the upper inspection screen, some of the inspection points closer to the lower one are not registered, and the position of the lower inspection screen is reset.

In the inspection data creating method according to the second aspect of the present invention, a step of setting an inspection screen at a position including an unregistered inspection point and an inspection order of the inspection screen data set here are optimal. It is provided with a structure called a step of inserting it at the position.

[0008]

According to the present invention, by the above-described configuration, the entire substrate is vertically divided into equal intervals to form columns, and the position data of the inspection points are rearranged in order from the upper part of the substrate for each column. Next, the position of the inspection screen is set so that the uppermost inspection place is included in the upper part of the inspection screen for each column, and the inspection place data in the set inspection screen is registered.

Next, the position of the inspection screen is set so that the inspection position located at the top among the remaining inspection positions excluding the registered inspection position is included in the upper part of the inspection screen, and is registered first. It is determined whether the difference between the number of inspection points on the inspection screen and the number of inspection points on the inspection screen is within the allowable value. If it is more than the allowable value, the registration of the inspection points included in the previous inspection screen is canceled, and the registration is performed again in order from the upper part of the screen. At this time, if the value obtained by dividing the total number of inspection points included in the two inspection screens by 2 is registered, the registration of the upper screen is completed and the registration of the lower inspection screen is started. By performing this process up to the last column, the difference in the number of inspection points between the inspection screens processed in parallel becomes small. Furthermore, after the above processing is completed, if there is an inspection point that has not been registered in the board, the inspection screen is set at the position including the inspection point, and the inspection screen data set here is used for the inspection order. The non-inspection is prevented by being inserted in the optimum position of.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An inspection data creating method according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a flow chart of an inspection data creating method in an embodiment of the present invention. In FIG. 1, 1 is the length of the overlapping portion between each row of the inspection screen,
That is, the step of inputting the initial value such as the overlap amount or the allowable value of the difference in the number of inspection points in the vertically adjacent inspection screens in the same row, 2 is the horizontal length of the substrate, the inspection screen pitch, that is, the inspection screen. The process of rearranging the inspection point data in the column by dividing by the value obtained by subtracting the overlap amount of the inspection screen from the horizontal length of 3 is currently registered in the column. The step 4 of setting the inspection screen position so that the uppermost inspection point that is not included is included in the uppermost portion of the inspection screen. 4 is the step of registering the data of the inspection point included in the inspection screen, and the registered inspection point is subjected to the subsequent inspection. This is a process for omitting from the target when setting the surface. Further, 5 is a step of newly setting an inspection screen in the same manner as in step 3 except for the inspection points registered in step 4, and 6 is an inspection in the screen between the inspection screens set in step 3 and step 5. Step 7 is to judge whether the difference in the number of points is less than or equal to the allowable value. In step 7, if the difference in the number of inspection points is greater than or equal to the allowable value, the inspection point registered in step 4 is canceled and the inspection screen set in step 3 is displayed. Step of registering up to the re-registered number shown in ( Equation 1) in order from the inspection point located at the top, 8 is a step of judging whether the setting of the inspection screen is completed from the board size to the end of the row, 9 is all inspections The unregistered inspection location is searched from the location data, the inspection screen is set to the unregistered location, and the registration data is set to the optimal inspection sequence position from the inspection screen position already set. Is a step of inserting.

The operation of the inspection data creating method configured as described above will be described below with reference to FIGS. 1, 2, 3, 4, 5, 5, and 7 .

FIG. 6 shows an example of a printed circuit board to be inspected. The outer peripheral rectangle 10 represents the outer shape of the printed circuit board, and the small rectangle 11 in the printed circuit board and many other rectangles are the inspection points. First, it is assumed that the overlap amount is set in the step 1 and the tolerance of the number of inspection points is set within 4 points. The size of the inspection screen is assumed to be known in advance. Next, the printed circuit board is vertically divided into four as shown in FIG. 2 by the operation of step 2 to form the first row 12, the second row 13, the third row 14, and the fourth row 15, and further, for each row. The inspection location data table shown in (Table 1) is rearranged in order from the inspection location having the highest right Y coordinate. First, the setting of the inspection screen is started from the first row. Inspection point 16 at the top of the first row by step 3
The inspection screen 17 is set so that is at the top of the screen. Next, in step 4, the inspection location in the inspection screen 17 is registered. In FIG. 2 , the registered inspection points are indicated by dotted lines. Subsequently, the inspection screen 19 is set so that the inspection position 18 located at the uppermost position among the inspection positions left in the first row in step 5 is located at the uppermost part of the screen. Here, in step 6, the difference in the number of inspection points on the inspection screen 17 and the inspection screen 19 is calculated. In this case, the number of inspection points on the inspection screen 17 is 9,
The number of inspection points on the inspection screen 19 is 11, so the difference is
Since the number is two, which is within the tolerance, the screen position resetting in step 7 is not executed. Next, in step 8, it is judged whether or not the inspection screen 17 is at the end of the row. Since it is not the last, the procedure returns to step 3 and the inspection point 18 located at the top among the remaining inspection points in the first row is at the top of the screen. The inspection screen 19 is set so as to enter the upper part. Next, in step 4, the inspection location in the inspection screen 19 is registered. Subsequently, the inspection screen 21 is set so that the inspection position 20 located at the top among the inspection positions left in the first row in step 5 is located at the top of the screen. Here, in step 6, the difference in the number of inspection points between the inspection screen 19 and the inspection screen 21 is calculated. In this case, since the number of inspection points on the inspection screen 19 is 11 and the number of inspection points on the inspection screen 21 is 6, the difference is 5, which exceeds the allowable difference.
The screen position is reset. Inspection screen 1 in step 7
Cancel the registration of 9 inspection points,

[0014]

[Equation 1]

The inspection points are re-registered up to the re-registration number of 9 which is the result of the calculation of. Where m is a natural number
Yes, screen m and screen m + 1 are adjacent screens in the column direction.
Show. At this time, the inspection points are re-registered from the upper part of the screen, so that the inspection points 22 and 23 are not registered. Finally, the inspection screen 24 is set so that the inspection position 22 located at the uppermost position among the inspection positions left in the first row by the process 3 and the process 4 enters the uppermost part of the screen.

FIG. 3 shows that the inspection screens 25 and 26 are set also for the second column by the same operation as described above.

FIG. 4 shows that after the operations of claims 1 and 2 are completed, the inspection point 27 is not included in any inspection screen and is not yet inspected. At this time, step 9 is to check the unregistered inspection points.

[0018]

[Table 1]

Detection is performed by searching the registration completion flag of the inspection point data shown in, and the inspection screen 28 is set at a position where the inspection point 27 enters the center of the screen as shown in FIG. Next, based on the value of the X coordinate on the inspection screen 28

[0020]

[Table 2]

The data of the inspection screen 28 is inserted next to the data of the inspection screen 26 in the inspection screen data table shown in FIG. In this case, the inspection order shall be inspected from left to right on the printed circuit board.

As described above, according to this embodiment, by providing each step shown in FIG. 1, the difference in the number of inspection points on the inspection screens 17, 19, 24 becomes within 4 as shown in FIG. . In addition, as shown in FIG. 3, the inspection screen of the second row is 25,
The number of inspection screens can be reduced because there are only two. Further, as shown in FIG. 5, since the dedicated inspection screen 28 is set for the inspection points 27 extending between the inspection screens, the occurrence of uninspected points can be prevented.

Although the rows are formed in the vertical direction of the substrate in the embodiment, the rows may be formed in the horizontal direction of the substrate. Also,
Although the first row is the left edge of the substrate in the embodiment, the first row may be the right edge of the substrate.

[0024]

As described above, according to the present invention, the number of inspection screens on the entire substrate is reduced by providing a step of freely setting the inspection screen position so as not to include an area where no inspection portion exists in the printed circuit board as much as possible. It is possible to create inspection data with less inspection time.

Further, by providing a step of automatically setting the position of the inspection screen so that the difference in the number of inspection points on the screen between adjacent inspection screens becomes small, the load of the visual recognition device is leveled. It is possible to create inspection data that shortens the inspection time.

Further, by providing a step of newly setting an inspection screen for an uninspected part, it is possible to create inspection data in which an uninspected part does not occur.

[Brief description of drawings]

FIG. 1 is a flowchart of an inspection data creating method according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an inspection screen dividing method of the inspection data creating method in the first embodiment.

FIG. 3 is an explanatory diagram of an inspection screen dividing method according to the second embodiment.

FIG. 4 is an explanatory diagram of an inspection screen dividing method according to the third embodiment of the present invention.

FIG. 5 is an explanatory diagram of the inspection screen dividing method.

FIG. 6 is a diagram of a printed circuit board used for explaining the inspection screen dividing method of the present invention.

FIG. 7 is an explanatory diagram showing a conventional inspection screen dividing method.

[Explanation of symbols]

2, 3, 4 steps

Claims (7)

(57) [Claims] 1. Multiple boards to be inspected with components mounted
Divide the inspection area, In a board inspection method for inspecting the component, The method of dividing into multiple inspection areas is Dividing step of dividing the inspection substrate into a plurality of regions in the column direction
When, A plurality of inspection objects are provided for each of the plurality of divided columns.
In the selected inspection object, in the column direction
The inspection object having the maximum Y-axis coordinate value is a column of the inspection area
First inspection at the position inscribed on the side with the largest Y-axis coordinate value in the direction
A setting step 1 for setting a region, The number and the number of the inspection objects included in the inspection area
A registration process for registering coordinate positions, By repeating the setting step 1 and the registration step, a plurality of
Setting step 2 to set the inspection area of
The setting step 1 and the registration step for each of the plurality of regions
And a setting step 2 described above.
Law. 2. After setting and registering the first inspection area,
Set a second inspection area that has a small Y-axis coordinate value and is adjacent
When included in the first inspection area and the second inspection area,
The first inspection so that the difference in the number of inspection objects is within the allowable range.
Characterized by having a resetting process for changing the inspection area
The board inspection method according to claim 1. 3. After setting and registering the first inspection area,
Set a second inspection area that has a small Y-axis coordinate value and is adjacent
When the number of inspection objects included in the first inspection area is m
The difference in the number n of inspection objects included in the second inspection area is an allowable value.
At the above time, registration of the inspection object included in the first inspection area
Is canceled once, and the above-mentioned inspection pair is repeated up to the number of (m + n) / 2.
The first inspection in order from the largest Y-axis coordinate value in the column direction of the elephant
The method further comprising the step of registering in the inspection area.
2. The board inspection method described in 2. 4. Multiple boards to be inspected with components mounted
Divide the inspection area, In a board inspection method for inspecting the component, The method of dividing into multiple inspection areas is Dividing step for dividing the inspection substrate into a plurality of regions in the row direction
When, A plurality of the inspection objects for each of the plurality of divided lines
In the selected object to be inspected, in the row direction
The inspection object having the maximum X-axis coordinate value is a line in the inspection area.
First inspection at the position where the X-axis coordinate value of the direction is inscribed in the side with the maximum
A setting step 1 for setting a region, The number and the number of the inspection objects included in the inspection area
A registration process for registering coordinate positions, By repeating the setting step 1 and the registration step, a plurality of
Setting step 2 to set the inspection area of
The setting step 1 and the registration step for each of the plurality of regions
And a method of inspecting a board, characterized in that the setting step 2 is performed.
Law. 5. After setting and registering the first inspection area,
Set a second inspection area with a small X-axis coordinate value and adjacent to it
At this time, the inspection included in the first inspection area and the second inspection area is performed.
Make sure that the difference in the number of objects to be inspected is within the allowable range.
A claim comprising a resetting step for changing the area
Item 4. The board inspection method according to Item 4. 6. After setting and registering the first inspection area,
Set a second inspection area with a small X-axis coordinate value and adjacent to it
At this time, the number m of inspection objects included in the first inspection area and the
The difference in the number of inspection objects n included in the second inspection area is less than or equal to the allowable value.
At the time above, register the inspection object included in the first inspection area
Canceled once, the above-mentioned inspection target up to the number of (m + n) / 2
First inspection in descending order of X-axis coordinate value of the object
6. The method according to claim 5, further comprising a step of registering in the area.
The board inspection method described. 7. A means for comparing an inspection object registered in the whole substrate with all inspection objects to search for an unregistered inspection object, and an unregistered inspection object. In the case where there is an inspection object, a means for setting an inspection screen at a position including the inspection object and a means for inserting the inspection area between the registered inspection objects according to the inspection order are provided. The board inspection method according to claim 1.