JPS6157663B2 - - Google Patents

Abstract

A connector pin, adapted to be inserted into a metallized bore in a conductive plate to form a solder-free mechanical and electrical connection between the pin and plate, is fabricated to provide an elongated deformable region adapted to engage the sides of the bore and consisting of two elongated beam members that are interconnected to one another by a cross member. The cross section of the resulting deformable region may be M-shaped or W-shaped. Upon insertion of the pin into the bore, the deformable region deforms elastically and, in the case of a small diameter bore, partially plastically to provide a good electrical and mechanical connection between the pin and plate.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compression pin for attaching a terminal to a conductive hole in at least one printed circuit board without using solder, and the pin has two outer parts on the outside of the compression part. The portion is electrically connected to the surrounding wall of the hole, and the portions are connected to each other by a bridge, which bridge is adapted to deform when the pin is inserted into the hole.

Compression pins in which the cross section of the compression part is square or rectangular are known. When such a compression pin is inserted into a conductive hole in a printed circuit board, the outer corner of the compression part penetrates into the tin layer applied to the wall of the hole. Since not only the diameter of the hole but also the dimensions of the cross section of the compressed portion of the pin vary, it is difficult to always ensure good conduction. This is especially true for
This occurs when such compression pins are used in holes drilled in a stack of printed boards. Furthermore, the compression pins installed in the holes drilled in the stacked printed boards must also mechanically fix the printed boards at the same time, but such things are not given in advance. This is impossible with the mechanical precision available.

What is known as an AMP compression pin is
In this pin, the compression part has two beam-like parallel parts, which are independent of each other and partially overlap in the center. When such a pin is inserted into a hole in a printed circuit board, the beam-like portions become misaligned with each other. In that way, relatively large tolerances between the bore and the compression section will be tolerated. A disadvantage of this approach is that in the compression section, only the two outer, mutually diagonal corners contact the wall of the hole. Since each beam-like part bends in the axial direction of the pin in the shape of a holder stretched on both sides, it is difficult to electrically connect or mechanically fix multiple printed boards stacked together. This is especially true since there is a difference in the ease of bending the pin in the axial direction, especially in the beam-like portion.

Other compression pin embodiments include pipes with slits running the length of the compression section. When such a pin is inserted into a hole in a printed circuit board, the circular arcuate portion of the compressed portion is bent inward. A large area contact is made between the wall of the hole and the compression section. Therefore, if a high resistance layer is formed on the hole surrounding wall and/or the compressed portion, the contact resistance between the pin and the hole surrounding wall may be affected.

No corner of the compression part leaks into the tin membrane attached to the wall of the hole. In this case as well, the drawbacks mentioned above occur. This means that electrical and/or mechanical connections between stacks of printed circuit boards cannot always be made reliably with such compression pins.

The compression pin must be such that an electrical and mechanical connection is always made between the pin and the printed circuit board within the tolerance tolerance of the hole and/or the compression part. Electric like that,
A mechanically sound connection must also be obtained for a large number of superimposed printed circuit boards which are interconnected by compression pins.

The compression pin made by EP-PS (European patent) 5356 has a thick outer part and is made so as not to deform, and the outer diameter of that part is made to match the inner diameter of the hole. It is circularly arcuate. The outer peripheries are connected to each other by thin bridges. If such a pin is inserted into the hole, the bridge will become deformed or detached.
The outer diameter of the outer portion contacts the wall of the hole. This does not penetrate the tin film on the wall surrounding the hole, resulting in the drawbacks mentioned above. especially,
The bridge becomes completely deformed or detached, so that it no longer has the elasticity necessary to force the outer diameter of the outer portion against the wall of the hole when the pin is inserted into the hole. The disadvantage is that Such drawbacks appear particularly when the pin is subjected to mechanical loads, and in particular when it is rocked. This compression pin is unsuitable when two or more printed circuit boards must be connected to each other by such holes. If the pin is inserted through the hole in the top printed board, the bridge will be completely deformed or peeled off by the retainer attached to the hole, so the hole in the second printed board will If the diameter of the hole is not smaller than the diameter of the hole in the first printed board, the compressed portion will not be able to receive support in the hole in the second printed board.

These problems have been solved by the method described in claim 1. Examples that take advantage of this advantage are described in the second and subsequent claims.

The thin bridge connecting the outer leg-shaped parts deforms firstly elastically when the compression pin is inserted into the hole in the printed circuit board, and partly plastically where the hole diameter is very narrow. The outer leg-shaped part is only elastically deformable. However, the outer corner of this part rests against the tin layer on the hole surround and is in constant contact with the hole's copper surround.
In this way, airtight, vibration-free contact surfaces are created at four locations. If the hole diameter is small,
The outer leg-shaped part deforms elastically and in the extreme case has an outer diameter approximately equal to the inner diameter of the wall of the hole. Since the thin bridge part and the outer part can be elastically deformed, the contact between the holes drilled in the stacked printed boards and the pin is such that the holding part is in each hole. Since it deforms according to the conditions, it can be obtained well.

Examples will be described in more detail below using the drawings.

The compression pin shown in FIG. 1 has a spring contact 5 attached to its upper side. A compression section 6 is attached below it. This compressed part 6 is further formed into a pin 7 for an ordinary wire wrap.

The compression pin is made by stamping from a strip of material. The compression part 6 is cast and then separated from the connection made of a strip of material 8 with locating holes.

Such compression pins are inserted into holes 9 in the printed circuit board 10. As can be seen from FIG. 2, the compression section 6 is
It deforms when inserted into the hole 9. Comparing FIG. 2 and FIG. 3, it can be seen that the inserted pin is elastically deformed so that in FIG. 3 there is a bulge 6 at the bottom of the hole.

An example of a cross section of the compression section is shown in FIG.
This compression section has a generally M-shaped cross section. It consists of parallel outer parts 11, 12 in the form of two outer legs. The two outer parts 11, 12 are connected to each other by a bridge 13. The bridge 13 is V-shaped.

As can be seen from FIG. 5, the conversion section 14 between the compression section 6 and the pin 7 is approximately conical. The apex angle of this cone is approximately 15°. At this conversion portion 14, the bridge 13 is narrowed downward in a wedge shape. The tip of that part is rounded off to 15. Bridge 13
It is more convenient for the end faces to be at right angles (see the outline shown by the dash-dotted line). FIG. 6 shows a state in which the pin is inserted into the hole 9 up to the compression part 6. This hole is shown with standard dimensions. Compression section 6
When a pin with a . At this time, the bridge 13 is elastically deformed. The outer parts 11, 12 also undergo elastic deformations, but their magnitude is less than that experienced by the bridge 13. Due to the elastic deformation of the bridge 13 and the outer parts 11, 12, mechanical energy is stored and the corner 16
generates the necessary contact pressure in the area to ensure reliable contact function. Since the elastically deformed portion is relatively large, a certain difference in the size of the hole can be compensated for, as will be explained further later. The four corners 16 fit into the tin layer 2 and come into contact with the copper tube 3, which is then slightly deformed but not cut.
The internal stress generated in the printed board 10 at this time is relatively small. The reliability of the contact is provided by the elastic part of the compression part 6 and the amount of energy stored in the hole 9.

In the embodiment shown in FIG. 4, when the bridge 13 is crushed, the upper ends of the legs of the outer parts 11 and 12 (the upper ends in the upper part of FIG. 4) are pushed outward, so that the cross section becomes W-shaped. Due to the elasticity of the outer parts 11, 12, which tend to come into contact with the walls of the hole, the distance between the upper corners 16 is restored to be equal to that of the lower corners 16 in FIG.

In the embodiment of FIG. 7, the bridge 13' is also V-shaped. Contrary to the embodiment of FIG. 4, the leg 17 of the bridge 13' has a leg-shaped outer portion 1.
1, 12 begins a distance 18 from the lateral edge 19 of the lateral edges 19 of 1, 12. 4 and 7, the legs 17 of the bridges 13 or 13' join the outer portions 11, 12 at about 60° or less, and the legs of the bridges form an angle of about 120° with respect to each other. What they have in common is that they intersect. The bridge 13 or 13' has a leg-shaped outer part and the same thickness as 11, 12, but may also be thinner. Also, according to the preferred embodiment, the length of the outer portions 11, 12 (as shown in the drawings) is approximately equal to the thickness of the outer portions 11, 12, as shown.
It is 2.5 times.

As already mentioned, when the bridge 13 is crushed as shown in FIG. 4, the upper leg-shaped outer parts 11 and 12 are pushed outward, and the inserted part has a W-shaped cross section. Tend. The reason why the M-shaped shape is preserved in the inserted pin is due to the elasticity of the outer parts 11 and 12, which are fixed on the lower side and act like an object to which a force is applied on the upper side. and deforms to match the wall surface of the hole 9.

In the embodiment of FIG. 7, even when the bridge 13' is crushed, the leg-shaped outer parts 11,1
The free ends of 2 are bent outwards, ie the cross-section is essentially W-shaped. However, since the leg 17 of the V-shaped bridge 13' is attached to the central part of the leg-shaped outer part 11, 12, this part 11, 12 acts as a support in the central part of the deformation area. do. This support is loaded at both ends 16.

As can be seen in FIG. 8, if the dimensions of the holes 9 are too large, the corners 16 will penetrate evenly into the tin layer.
When the pin is inserted, the bridge 13' deforms elastically so that the angle between the two legs 17 is less than 120°. At 11, 12 an elastic deformation takes place in the indicated part, the deformation being less in the upper part than in the lower part.

The parts indicated by 11 and 12 are as if they were corner 1.
Since the portion 6 functions as a support supported at the center where force is applied, the outer edges of the portions 11 and 12 are aligned with the inner edge of the hole 9. This is clearly seen in FIG. 8 in the case of oversized holes.

A pin having the cross-sectional shape shown in FIG.
When inserted into the undersized hole 9 shown in FIG. 9, the leg 13' is plastically deformed by a certain amount. This plastic deformation first of all produces the base 20 of the V-shaped bridge 13'.

The parts indicated by 11 and 12 are elastically deformed to a large extent, and the corner 16 completely penetrates into the tin layer 2 and sticks into the copper tube. In that way, the entire outer edge of the portions designated 11, 12 is coated with the tin layer 2 and also at the corner 16.
comes into contact with the copper cylinder 3.

In the embodiment shown in the figures, the thickness of the sections 11, 12 is preferably equal to the thickness of the bridge 13 or 13'.

bridge 13 or 13' and outer part 11,
12 have the same thickness, the pins can connect a plurality of printed boards 10 to each hole 9.
It has become suitable for connection by. Optionally, the bridge 13 or 13' may here be thicker than the outer parts 11, 12'.

On the other hand, if the plate is thin and the pin is inserted into a narrow hole, the bridge 13 or 13' can be made thinner than the outer parts 11, 12.

The pin described here is produced by casting and stamping. In the embodiment shown in FIG. In other words, it was shown that it is just right to make it in the same way as the press mold used to make the bridge 13'.

Pins can also be made by making cuts in pipe. FIG. 10 shows a cross section of the compressed portion of the pin thus made.

The pipe 27 is made with a cut 28 and, on the opposite side, a semicircular depression 29, which has a rounded outer leg-shaped part 11', 1
It is connected to 2'. The semicircular recess 29 together with the rounded portion 30 corresponds in its operation to the bridge 13 or 13' in the previously shown embodiment. The outer circular arcuate parts 11', 12' are similar to the outer parts 11 and 12 in the previously shown embodiments.
It can be compared to

11', 1 to ensure that it enters the tin layer 2.
The outer portion of 2' is flared outward. This outward spread is indicated at 26. The result is corner 25, which is the same as corner 16 in the previously shown embodiment.

[Brief explanation of the drawing]

Figure 1 shows a compression pin 2 with a spring-like contact surface.
Figure 2 shows the state at the beginning of the book, Figure 2 shows the compression pin shown in Figure 1 inserted into the hole in the printed board as far as the insertion point, and Figure 3 shows the compression pin attached to the printed board. 4 shows a cross section of the compression section, FIG. 5 shows a side view of the compression section shown in FIG. 4, and FIG. 6 shows the compression pin shown in FIGS. 4 and 5. Fig. 7 shows a cross section of a compressed part in another embodiment, and Fig. 8 is the same as Fig. 6, and shows a cross section of a standard-sized one inserted into a hole drilled on a printed board. Fig. 9 is the same as Fig. 8 but shows a cross section when the hole size is small, and Fig. 10 shows the cross section with the compressed part shown in Fig. 7 when A cross section of an example is shown. 10; printed board, 9; hole, 13; bridge,
11, 12; Leg portion, 6; Compression portion.

Claims (1)

[Scope of Claims] 1. A connector pin made of a conductive material that is inserted by compression into a hole formed in a conductive plate and connected without using solder, comprising two deformable outer portions that engage with the wall of the hole; has a bridge that connects the
A compression pin whose bridge deforms when the pin is inserted into the hole, wherein the shape of the outer portions 11, 11', 12, 12' is beam-shaped, each having at least one outer end 16, 25'; A compression pin characterized in that the bridge is elastically deformable and substantially V-shaped. 2. The compression pin according to claim 1, wherein the outer portions 11, 11', 12, 12' are also elastically deformable. 3. In the compression pin according to claim 1 or 2, the outer portions 11, 11', 12, 1
2' and bridges 13, 13', 29, 30 are of approximately the same thickness. 4. In the compression pin according to any one of claims 1 to 3, the bridge leg 17
A compression pin characterized by an angle of 120°. 5. In the compression pin according to claim 3 or 4, the width of the bridge 13, 13' between the outer parts 11, 12 is approximately equal to that of the outer parts 11, 12.
A compression pin characterized in that the overall thickness is equal to 12. 6. In the compression pin according to any one of claims 1 to 5, the leg 17 of the bridge 13' is attached at a certain distance from the lateral edge 19 of the outer parts 11, 12. A compression pin characterized by: 7. A compression pin according to claim 6, characterized in that the leg 17 is attached approximately to the center of the outer portions 11, 12. 8. The compression pin according to claim 5, wherein the length of the cross section of the outer portions 11, 12 is about 2.5 times the thickness of the cross section. 9. The compression pin according to claim 6 or 7, characterized in that the V-shaped bridge 13' is formed by pressing, and the displacement of the material by pressing is approximately equal on both sides of the bridge 13'. compression pin. 10. A compression pin according to any one of claims 1 to 3, which is made of a cut pipe 27 and has a semicircular shape on the opposite side of the longitudinal cut 28. A compression pin characterized in that it is provided with a recess 29 and its outer portions 11', 12' are flared outwardly on the free side. 11. The compression pin according to claim 10, wherein the outer portions 11' and 12' are formed in an arcuate shape. 12. In the compression pin according to claim 10 or 11, the recess 29 and the outer portion 1
A compression pin characterized in that a radius 30 is provided between 1' and 12'.