JPH0766517A - Test coupon set - Google Patents

Abstract

PURPOSE:To detect the positional slip of through hole parts within the wide range of a printed-circuit substrate by a method wherein the title test coupons provided with a plurality of clearance parts are arranged on the plurality of positions of removable lug part of a printed-circuit substrate. CONSTITUTION:Within the test coupon set 10, testing conductive patterns 12 are provided with a reference part 13 for boring a reference through hole part 21 and a plurality of clearance parts 14 having respective difference clearances for boring testing through holes 22. Next, the test coupons 10 are arranged in a plurality of positions of the removable lug part of a printed-substrate 50 for electrical check in respective test coupons 10 to detect the positional slip of through hole part 20 within the wide range of the printed-circuit board 50. Accordingly, the positional slip of the through hole part 20 can be detected to eliminate the part of through hole part 20 having the positional slip exceeding the allowance range thereby enabling the reliability upon the while through hole part of the printed-circuit board to be enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test coupon set, and more particularly to a test coupon set which can easily and surely perform an electrical check of a through hole portion provided in a printed circuit board.

[0002]

2. Description of the Related Art Conventionally, in printed circuit boards,
Whether the through hole is formed at the correct position,
This is done by electrically checking the conduction or insulation between the through hole and the conductive pattern.

For example, in the through hole formed in the escape portion of the conductive pattern of the inner layer as shown in FIGS. 8 and 9, it is electrically checked whether the through hole and the conductive pattern of the inner layer are insulated. Checking is performed. For a through hole formed on a land portion of an inner layer conductive pattern as shown in FIGS. 10 and 11, for example, whether the through hole and the inner layer conductive pattern are electrically connected or not It was done by checking electrically.

The electrical check is not limited to that performed after through-hole plating is performed to form the final through-hole. For example, after the through-hole primary hole is formed, the through-hole primary hole is formed. It can also be implemented by inserting a conductive pin or the like into the through hole, and the through hole and its primary hole that can be electrically checked are collectively referred to as a through hole portion.

[0005]

However, the permissible range of positional deviation of the through hole due to the electrical check,
That is, the clearance is determined by the size of the relief portion or the land portion of the above-described conduction pattern with respect to the size of the through hole portion, and thus the positional deviation of the through hole portion is a great cause of various obstacles in the future. Even if there is, there is a problem that it is judged as a good product as long as the positional deviation is equal to or less than the clearance.

Further, if the positional deviation of the through hole portion is equal to or larger than the clearance, it is naturally judged as a defective product, but the degree of the deviation cannot be detected, and the positional deviation of the through hole portion is corrected. Was difficult.

On the other hand, the electrical check is not carried out on all through holes of the printed circuit board,
Generally, a through hole portion is provided for a test in a releasable ear portion of a printed circuit board, and this through hole portion is used. For this reason, stress in the manufacturing process of the printed circuit board, the transportation process, etc., distortion of the printed circuit board itself caused by various factors such as temperature and humidity, and
Even if some of the through-holes on the printed circuit board are misaligned by more than the clearance due to mechanical misalignment due to the characteristics of the punching machine that punches through-holes, etc. Further, when it is determined that the test through-hole portion is a good product, there is a problem that the entire through-hole portion of the printed circuit board is also determined to be a good product. Therefore, it has been demanded to detect a partial positional deviation of the through-hole portion of the printed circuit board and improve the reliability of the entire through-hole portion of the printed circuit board which is determined to be a good product. ..

The present invention has been made in order to solve such a problem, and the purpose thereof is that even if it can be judged as a non-defective product in an electrical check, the position shift occurs in the through hole portion. If there is a problem, this can be detected, and not only the degree of positional deviation can be detected, but also the reliability of the entire through hole part of the printed circuit board can be improved. Is provided by a simple structure.

[0009]

The means adopted by the present invention for solving the above problems will be described with reference to the reference numerals used in the drawings. "The through hole portion 20 provided in the printed circuit board 50 will be described. A test coupon set for performing an electrical check, which includes a reference through hole portion 2
The test coupon 10 including the test conductive pattern 12 having the reference portion 13 for making a hole 1 and a plurality of clearance portions 14 having different clearances for making the test through hole portion 22 is printed on the printed board. It is arranged at a plurality of locations on the releasable ear portion 52 of the circuit board 50 ”.

[0010]

The test coupon set of the present invention thus constructed operates as follows.

First, the test coupon 10 is provided with a plurality of clearance portions 14 having different clearances for forming the test through hole portion 22. For this reason, the test through-hole portions 22 are bored in the clearance portions 14, and the test through-hole portions 22 are electrically checked to determine whether the electrical check is good or bad. By detecting the positional deviation based on the clearance value, the printed circuit board 50 can be rejected as a defective product when a large positional deviation that may cause trouble in the future occurs.

Further, by detecting the degree of misalignment, it becomes possible to immediately make corrections such as timely correction of a punching machine or the like for forming the through-hole portion 20, which may result in defective products. It can be prevented in advance.

Next, the test coupon 10 as described above.
Are arranged at a plurality of releasable ears of the printed circuit board 50. Therefore, by performing an electrical check for each test coupon 10, the printed circuit board 50
It is possible to detect the positional deviation of the through hole portion 20 in a wide range. Therefore, the printed circuit board 50
Due to the distortion of itself and the characteristics of the punching machine, even if some of the through holes 20 are misaligned, it can be detected. If this is above the allowable range, it is rejected as a defective product. You will get it. That is, a partial positional deviation of the through hole portion 20 of the printed circuit board 50, which cannot be detected conventionally, is detected, and a part of the through hole portion 2 is detected.
The printed circuit board 5 which is determined to be a good product by excluding a product having a positional deviation of 0 or more than the allowable range as a defective product.
It is possible to improve the reliability of the entire 0 through hole portion 20.

Further, by detecting a partial positional deviation of the through-hole portion 20 of the printed circuit board 50, it becomes easy to find a factor that causes the positional deviation of the through-hole portion 20, for example, the printed circuit board 50 itself. If the local distortion is used, the quality of the printed circuit board 50 itself is improved, and if the characteristics of the punching machine are used, the machine precision is improved. For this reason, it is possible to prevent the generation of defective products of the printed circuit board 50.

[0015]

EXAMPLE An example of a test coupon set according to the present invention will now be described in detail with reference to the drawings.

1 and 2 show an example in which the test coupon set according to the present invention is applied to a printed circuit board 50 having a conductive pattern (not shown) in the inner layer. The printed circuit board 50 includes a work area 51 in which a normal conductive pattern (not shown) is provided on the inner layer and the surface layer, and electronic parts are mounted on the work area 51. 52, each of the ear portions 52 is provided with an individual test coupon 10.

The test coupon 10 is provided with a land 11 as a mark of the drilling positions of the reference through hole portion 21 and each test through hole portion 22 as shown in FIG. 3 on the surface layer, and the inner layer as shown in FIG. The test conductive pattern 12 as shown in FIG. And the conductive pattern for test 1
The reference numeral 2 includes a reference portion 13 for forming the reference through hole portion 21 and a plurality of clearance portions 14 for forming the test through hole portion 22. Here, the clearances of the respective clearance portions 14 are made to increase sequentially from the outer end side of the printed circuit board 50 toward the inner side. This is generally done by laminating insulating base materials to form the printed circuit board 50. At this time,
This is because the printed circuit board 50 itself tends to be distorted on the outer end side, and the printed circuit board 50 is provided with the clearance portion 14 having a small clearance on the outer end side.
This is to ensure that the positional deviation of the through hole portion 20 caused by the distortion of itself can be detected.

In this embodiment, the clearance portion 14 is provided with a relief portion 15, and the relief portion 1
If the test through-hole portion 22 is formed in the inside 5, the test through-hole portion 22 and the test conductive pattern 12 are formed.
Although the example in which the and are insulated is shown, the invention is not limited to this, and the land portion is provided, and the test through hole portion 22 is provided on the land portion.
The through hole portion 22 for test and the conductive pattern 12 for test may be electrically connected to each other by drilling.

The inner conductive test pattern 12 is also provided.
Is not limited to the so-called solid pattern as shown in FIG.
Reference site 13 and each clearance site 14 as shown in
May have a swollen shape. In this case, when the printed circuit board 50 is formed by laminating the insulating base materials, the insulating base materials on the front and back sides of the test conductive pattern 12 are firmly bonded to each other as compared with the solid test conductive pattern 12. It is possible and convenient.

Further, in this embodiment, the land 11 on the surface layer corresponding to the reference portion 13 on the inner layer is provided with a reference numeral 11a such as letters and symbols to indicate the land 11 corresponding to each clearance portion. A numerical value 11b indicating the clearance value of each clearance portion 14 is attached so that the result can be clearly recognized visually when an electrical check is performed. In addition, the numerical value 11b of the land 11 corresponding to the clearance portion 14 which is the allowable range of positional deviation
Is marked with a mark 11c such as an underline so that a positional deviation exceeding the allowable range can be surely recognized.

By the way, in the electrical check, after the through holes are plated to form the final through holes, the presence or absence of continuity or insulation between the through holes of the reference portion 13 and the through holes of each clearance portion 14 is inspected. After the primary hole of the through hole is drilled, the conductive pin 31 is inserted into the primary hole of the through hole of the reference portion 13 and each clearance portion 14 to inspect for conduction or insulation. You may go by. In addition to the above, as shown in FIG. 2, as shown in FIG. 2, prior to the formation of the primary hole of the through hole in the work area 51, the ear portion 52 is formed.
In this case, the primary hole of the through hole is bored. At this time, the conductive pin 31 is inserted into the primary hole of the through hole of the reference portion 13, and the drill 32 for bore the primary hole of the through hole of each clearance portion 14. The conductive pin 31 and the conductive pin 31 may be connected to the conductivity check unit 30 and the conductivity check unit 30 may perform an electrical check at the time when the primary hole of the through hole is drilled by the drill 31. In this way, the electrical check process can be simplified.

Next, FIG. 6 shows another embodiment of the test coupon set of the present invention. This is one in which the test coupons 10 in the X direction and the Y direction are arranged at a plurality of locations on the ear portion 52 of the printed circuit board 50, and the positional deviation of the through hole portion 20 in the X direction and the Y direction is detected. It was made possible. According to such a test coupon set, by accurately detecting the positional deviation of the through hole portion 20, for example, the punching machine can be accurately corrected in the X direction or the Y direction, and the positional deviation exceeding the allowable range can be achieved. It can be more reliably prevented from occurring.

Finally, FIG. 7 shows another example of the test coupon 10. This is the test conductive pattern 1
2, a first test conductive pattern 12a including a reference portion 13a and a plurality of clearance portions 14a having different clearances in the X direction, a reference portion 13b and a Y portion, respectively.
Clearance sites with different clearances 1
4b and a second test conductive pattern 12b provided in a layer different from the first test conductive pattern 12a. Such a test coupon 1
According to 0, it is possible to detect the positional deviation of the through hole portion 20 in the X direction and the Y direction with one test coupon 10, and the ear portion 5 of the limited area of the printed circuit board 50.
It is possible to easily dispose even in No. 2.

[0024]

As described in detail above, in the test coupon set of the present invention, test coupons having a plurality of clearance portions having different clearances are arranged at a plurality of releasable ear portions of a printed circuit board. In addition to being able to detect the degree of positional deviation of the through-hole portion, it is possible to detect the positional deviation of the through-hole portion over a wide range of the printed circuit board.

Therefore, according to the present invention, even if it can be judged as a non-defective product in the electrical check, if there is a problem of positional deviation in the through hole portion, this can be detected, and the positional deviation can be detected. It is possible to provide a test coupon set with a simple structure that can detect not only the degree of the above, but also can improve the reliability of the entire through hole portion of the printed circuit board.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a test coupon set according to the present invention.

FIG. 2 is an enlarged sectional view taken along line AA in FIG.

FIG. 3 is a view as seen from the arrow BB in FIG.

FIG. 4 is a sectional view taken along line CC in FIG.

FIG. 5 is a partial plan view showing another example of the test conductive pattern.

FIG. 6 is a plan view showing another embodiment of the test coupon set according to the present invention.

FIG. 7 is a partial plan view showing another example of the test coupon.

FIG. 8 is a sectional front view showing a conventional electrical check means.

9 is a sectional view taken along line DD in FIG.

FIG. 10 is a sectional front view showing a conventional electrical check means.

11 is a sectional view taken along line EE in FIG.

[Explanation of symbols]

 10 Test Coupon 11 Land 11a Code 11b Numerical Value 11c Mark 12 Test Conductive Pattern 12a First Test Conductive Pattern 12b First Test Conductive Pattern 13 Reference Part 13a Reference Part 13b Reference Part 14 Clearance Part 14a Clearance Part 14b Clearance Part 15 Relief part 20 Through hole part 21 Reference through hole part 22 Test through hole part 30 Continuity check part 31 Conductive pin 32 Drill 50 Printed circuit board 51 Work area 52 Ear part

Claims (1)

[Claims] 1. A test coupon set for performing an electrical check of a through-hole portion provided on a printed circuit board, comprising a reference portion for forming a reference through-hole portion and a test through-hole portion. It is characterized in that a test coupon having a plurality of clearance portions each having a different clearance for drilling is provided in a test conductive pattern, and the test coupons are arranged at a plurality of releasable ear portions of the printed circuit board. And test coupon set.