JPH0623012Y2 - Printed wiring board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a printed wiring board, and more particularly to a structure of a printed wiring board that can be electrically detected without visually observing a mechanical processing deviation of the printed wiring board.

(Prior Art) Conventionally, an electric component such as a capacitor or an IC is connected to a wiring pattern made of, for example, a copper foil formed on a printed circuit board made of an insulator. The place where it is connected and soldered is called a pattern land.

In order to connect electric parts to these pattern lands, first, holes are formed in the pattern lands by, for example, pressing, terminals of the electric parts are inserted into the holes, and soldering is performed. Since these processed holes are generally punched at once by a press, if the setting position of the printed board is displaced, all the processed holes are displaced.

Therefore, conventionally, a representative machined hole is defined for inspection, and the deviation of the machined hole is visually measured using a magnifying glass or the like to determine whether the printed wiring board passes or fails.

FIGS. 4 (a) and 4 (b) are plan views for explaining a conventional method for inspecting a deviation of a processed hole. In the figure, 10 is a pattern land, and 11 is a processed hole.

FIG. 3A shows a case where the machined hole 11 is provided at a standard position, and the interval between the machined hole 11 end and the linear end 10a of the pattern land is, for example, 0.3 mm.

The figure (b) shows the limit of acceptance of the processed hole 11,
For example, when the deviation of the center value of the processed hole 11 is less than 0.25 mm, or when the distance between the end of the processed hole 11 and the straight end 10a of the pattern land is 0.05 mm or more, it is defined as pass. In other words, the permissible error of machined hole deviation is 0.25 mm.

(Problems to be solved by the invention) As described above, an inspector visually inspects a machining deviation such as a hole formed in a printed wiring board by a press, based on the inspection standard. The number of man-hours required for inspection per sheet is large, and eyes are tired if inspection work continues for a long time.
There was a problem that the inspection accuracy decreased and the reliability was poor.
Moreover, since it cannot be automated, it has been a bottleneck in the process.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and in a printed wiring board in which a wiring pattern made of a good electric conductor is formed on an insulating substrate, a predetermined width t Two semi-circular patterns 21a, 21a having an inner diameter d, and linear patterns 21b, 21b connected to the semi-circular patterns 21a, 21a and having the same width t as described above.
And a terminal portion 22, 23 connected to one end of each of the linear patterns 21b, 21b, respectively, and the detection portion 21.
The predetermined width t provided on the detection conductor pattern 20 is set to the same size as the tolerance of the deviation of the processed hole 11.
To provide a printed wiring board provided in the margin.

(Embodiment) FIG. 1 is a plan view showing an essential part of a printed wiring board according to the present invention. In the figure, reference numeral 20 denotes a detection conductor pattern of the present invention made of a conductor film, which is formed in a margin of a printed wiring board on which a wiring pattern (not shown) is formed. The detection pattern 20 has a substantially S-shaped detection portion 21.
And terminal portions 22 and 23 formed at the ends thereof. The detection unit 21 has a width t and is composed of two semicircular patterns 21a having an inner diameter d and a linear pattern 21b having a width t connected to the semicircular patterns 21a and 21b. Circular terminal portions 22 and 23 are formed. Therefore, the terminals 22 and 23 are electrically connected.

The size of the width t of each of the patterns 21a and 21b of the detection unit 21 is set to have the same size as the tolerance of the deviation of the processing hole 11. Before use, a pair of detection hole pins and dies having the same diameter as the inner diameter d of the semicircular pattern 21a are formed on a printed wiring board in advance in a die for punching, together with a pin and a die for processed hole for pattern land. The inner diameter d of the two formed semicircular patterns 21a is provided so as to be accurately pulled out.

Therefore, when the setting of the printed wiring board is deviated during the hole processing, the formation positions of the detection holes 24 and 25 are also deviated together with the formed pattern land processing holes. It is a top view for explaining a gap of detection holes 24 and 25. In FIG. 2, the detection holes 24 and 25 are A.
A case where the detection holes 24 are formed in a state in which one detection hole 24 extends over a part of the semicircular pattern 21a is shown, but each pattern of the detection unit 21 is not cut.
Therefore, the terminals 22 and 23 are electrically connected.
This means that if the deviation value of the detection hole is within the width t of the detection pattern 20, that is, within the allowable error range, the terminal portion 2
This means that continuity between 2 and 23 is always obtained.
FIG. 3 shows a case where the detection holes 24 and 25 are displaced in the B direction by more than the allowable error range, and shows a state in which a part of the detection pattern 20 is cut. In this case, the terminal parts 22, 23
There is no electrical continuity between them.

In the above description, the deviation of the detection holes 24 and 25 in the A and B directions has been described as an example. However, the deviation directions are not limited to these, and the same results as above can be obtained in all directions (360 °). There is no need to explain what can be obtained.

Therefore, in the inspection of the deviation of the processed hole 11 of the pattern land 10 at the time of shipment, it is possible to determine whether or not the deviation amount is within the allowable error range simply by checking the presence or absence of conduction between the terminal portions 22 and 23. Not only the accuracy and work efficiency are greatly improved, but also automation is possible, which greatly contributes to the rationalization of the entire printed wiring board process.

(Effects of the Invention) As described above, according to the present invention, in a printed wiring board having a wiring pattern made of a good electric conductor formed on an insulating substrate, two semi-circular patterns having a predetermined width and inner diameter are provided. , A substantially S-shaped detecting portion formed of linear patterns having the same width as the above connected to each of the semicircular patterns, and a terminal portion connected to one end of the linear pattern. Moreover, the predetermined width provided in the detection section is set to the same size as the permissible error of the deviation of the processed hole, and the detection conductor pattern is provided in the margin portion of the printed wiring board. It is possible to immediately determine whether or not the deviation of the plurality of machined holes formed in the range is within the allowable error range by electrically checking the presence or absence of continuity between the terminal parts, and to improve the inspection accuracy and work efficiency. Big The width can be improved, and the inspection can be automated, which makes it possible to provide a printed wiring board that is extremely advantageous for streamlining the process.

Further, since the detection conductor pattern as described above is provided in the blank portion of the printed wiring board, it is not necessary to use the corresponding portion of the printed wiring board to which the component is originally attached, for the electrical check. This is very convenient because it can be performed by using this conductor pattern, and it can be shaved off after checking, which has the advantage of expanding the utilization of the entire printed wiring board.

[Brief description of drawings]

FIG. 1 is a plan view showing a main part of a printed wiring board according to the present invention, FIGS. 2 and 3 are plan views for explaining a deviation of a detection hole, and FIGS. 4 (a) and 4 (b) are conventional. FIG. 6 is a plan view for explaining the method for inspecting the deviation of the processed hole. 10 ... Pattern land, 11 ... Processed hole, 20 ... Detection conductor pattern, 21, 31 ... Detection part, 22, 23 ... Terminal part 24, 25 ... Detection hole.

Claims (1)

[Scope of utility model registration request] 1. A printed wiring board in which a wiring pattern made of a good electric conductor is formed on an insulating substrate, two semicircular patterns having a predetermined width and an inner diameter, and the semicircular patterns respectively connected to the semicircular patterns. A substantially S-shaped detecting portion formed of a linear pattern having a width similar to that of the above, and a terminal portion connected to one end of the linear pattern, and provided in the detecting portion. The printed wiring board is characterized in that the margin is provided with a detection conductor pattern having a width equal to the tolerance of the deviation of the processed hole.