JPH0630879B2 - Press punch metal fittings for printed board processing - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a press punch metal fitting for printed board processing capable of forming an appropriate double-sided connection conductor on a side end surface or the like of a printed board.

(Prior Art) FIGS. 3A and 3B show structures for connecting printed wiring patterns 2 formed on the upper and lower surfaces of a substrate 1, respectively.
In (a), the double-sided connecting conductor 3 is arranged on the side end surface of the substrate 1, and in (b), the double-sided connecting conductor 3 is arranged on the inner wall surface of the through hole 4 formed through the substrate 1.

Such a connecting conductor is used not only for connecting between the wiring patterns on both surfaces of one printed board, but also for connecting between the wiring patterns on the inner and outer surfaces of a multilayer printed board.

On the other hand, as a method of forming a connecting conductor for connecting both surfaces of the printed board or the inner and outer layers of the multilayer printed board, first, copper, nickel, is formed on the entire surface of the substrate 1 including the side end surface and the inner wall of the through hole.
A method of depositing a metal such as gold or solder by vapor deposition or plating, and then removing an unnecessary portion of the metal by etching or another method is generally used, but in this method, a photoresist or an inner wall of the through hole of the substrate is used, Since selective etching with resist ink or the like cannot be performed, the inner wall of the through hole is cut using a press punch metal fitting, a drill, or a router bit (rotary blade).

However, in the conventional method of processing a router, it is not possible to form a smooth connecting conductor surface because the conductor peripheral portion cut by the router bit is turned up. For this reason, there is a drawback that the conductor film is peeled off from the turned-up portion, or plating vapor deposition in the subsequent step does not go smoothly.

FIGS. 4 (a) and 4 (b) are press-extracting metal fittings 10 which are conventionally used.
FIG. 3 is an explanatory view of the connection conductor 3 cut and formed by the press punching metal fitting 10, which has an advantage in that a plurality of connection conductors can be cut at the same time. However, in the press punching metal fitting 10 used here, the blade 10a has the side end surface of the substrate 1 (the inner wall surface of the through hole) as shown in the drawing.
Since it extends in a direction orthogonal to, the conductor of the cut end face (inner wall) is crushed and turned up in the direction of the arrow in the figure, which is not suitable for practical use.

(Object of the Invention) The present invention has been made in view of the above, and a print in which a connection conductor having a smooth surface can be separately formed by pressing on a side end surface of a substrate or an inner wall of a through hole. The object is to provide a press punching metal fitting for plate processing.

(Summary of the Invention) In order to achieve the above object, the press punching metal fitting for processing a printed board of the present invention forms a plurality of separate and independent connecting conductors by pressing on a side end surface of a printed board or an inner wall surface of a through hole. In the press punching metal member, the press punching metal member has a male die protruding in a trapezoidal shape, and the blade on the side of the male die has an acute intersection angle θ with the end face of the substrate 1 or the inner wall surface of the through hole. Is characterized by.

Further, it is characterized in that the connection conductor is formed by performing a press working using the press punching metal fitting.

(Example) Hereinafter, the press punch metal fitting for processing a printed board of the present invention will be described in detail with reference to the accompanying drawings.

1 (a) and 1 (b) are a perspective view and a plan view showing the structure of the press-excluding metal fitting of the present invention. The metal fitting 20 has a horizontally long base portion 21 and a trapezoidal shape with a predetermined distance from the base portion 21. It is composed of a plurality of male molds 22 formed to project. Male 2
Both sides of 2 are inclined blades 22a having a predetermined angle, and each blade 22a intersects with the end surface of the substrate 1 (or the inner wall surface of the through hole) as shown in FIG. 1 (b). θ is an acute angle (θ
<90 degrees). The optimum value of the intersection angle θ varies depending on the material of the substrate to be cut, the plate thickness, the thickness of the conductor to be cut, and the like.

The bottom surface 23 of the valley formed between the male molds 22 and the conductor 3 on the side end surface
The space t formed between the space and the space is, for example, 0.05 to
Set to about 0.5 mm. In FIG. 1 (b), the thickness of the printed wiring pattern 2 protruding from the edge of the substrate 1 is shown to be large for the convenience of illustration, and as a result, between the blade 22a and the corner of the pattern 2 is shown. Although it gives the impression that a triangular void is formed, the void is negligible because the thickness of the protrusion of the pattern 2 is actually small.

FIG. 2 is an explanatory view of the cutting surface of the printed board cut by the press punching metal fitting 20 of the present invention, and the connecting conductor 3 cut by the blade 22a having an acute crossing angle θ.
No defect such as turning up is formed on the side edge of.

As described above, in the present invention, the metal conductor layers are uniformly formed on both sides and side end surfaces of the substrate 1, and further in the through holes, and then unnecessary metal on both the front and back surfaces of the substrate is removed by etching, and finally the press punching is performed. By cutting the side end surface (the inner wall surface of the through hole) with the metal fitting 20, it is possible to easily and accurately create an appropriate connection conductor 3 without turning up.

As a result, it is possible to easily realize the internal connection of both surfaces of the board and the multilayer board through the side end surface of the printed board and the inner wall of the through hole, and the mounting density by the through hole structure can be significantly improved.

(Effect of the Invention) As described above, according to the present invention, appropriate connection conductors having a smooth surface can be formed independently on the side end surface of the substrate and the inner wall of the through hole by press working.

[Brief description of drawings]

1 (a) and 1 (b) are a perspective view and a plan view showing the structure of a press punching metal fitting of the present invention, and FIG. 2 is an explanatory view of a connecting conductor of a printed board made by the press punching metal fitting of the present invention, 3 (a) and 3 (b) are structural diagrams for connecting printed wiring patterns formed on both upper and lower surfaces of the substrate, respectively, and FIG. 4 (a).
(b) is an explanatory view of a conventionally used press-excluding metal fitting and a connection conductor cut and formed by the press-excluding metal fitting. 1 ... Substrate, 2 ... Printed wiring pattern, 3 ... Double-sided connection conductor, 4 ... Through hole, 10 ... Press punch metal fitting, 1
0a ... blade, 20 ... metal fitting, 21 ... base, 22 ... male, 22a ... blade, 23 ... valley bottom

Claims (2)

[Claims] 1. A press-extracting metal fitting for cutting and forming a plurality of separate and independent connecting conductors on a side end surface of a printed circuit board or an inner wall surface of a through hole by press working, wherein the press-extracting metal fitting has a trapezoidal male die. The blade on the side of the male die has an acute intersecting angle θ with the end face of the substrate or the inner wall surface of the through hole. 2. A method for manufacturing a connection conductor of a printed board, which comprises forming the connection conductor by press working using the press punching metal fitting according to claim 1.