JP2003123876A - Contact terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composition of a contact terminal avoiding friction between a press contact part and a chassis, moreover, enabling to design the contact terminal with small width in the left and right direction. SOLUTION: A contact terminal comprises a bottom part 1 having a joint surface 11 capable of connecting with a lower side base board 5 through a solder 7, a press contact part 3 pressing an upper side chassis 6, a folded part 2 formed into folded-shape through the bottom part 1 and the press contact part 3, elastically deforming at the one side of left and right side direction, and a stopper engaging with a lower side piece 31 extending from the press contact part at the other side of left and right side direction, preventing the press contact part from moving upward by the elastic force of the folded part 2. The problem is solved by forming the press contact part 3 into a shape of protruding upward, and by making at least the part connected to the folded part, out of connection part 23 located between the turnup part 2 and the press contact part 3, extend obliquely upward from the folded part 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is in a state of being connected to a lower substrate via solder, and elastically presses the upper chassis to support the chassis from below, and The present invention relates to a contact terminal capable of conducting a current between a chassis and a board.

[0002]

2. Description of the Related Art There are various structures for contact terminals,
In recent years, as shown in FIG. 3 and FIG.
A bottom portion 1 having a joint surface 11 that can be connected to the lower substrate 5 via the press contact portion 3 for press contacting the upper chassis 6;
A folded-back portion 2 that is elastically deformed on one side of the left and right and has a folded shape from the bottom portion 1 toward the pressure-contacting portion 3, and a lower piece 31 that extends from the pressure-contacting portion on the other side of the left and right. A relatively large number of connection terminals are used that are engaged with each other and have a stopper that prevents the pressure contact portion 3 from moving upward due to the elastic force of the folded portion 2.

The contact terminal has a relatively simple structure, but elastically supports it when pressure is applied from the chassis 6 side, and when pressure is not applied,
It is excellent in that its shape can be kept compact by holding the engaging portion 4.

As a contact terminal that actually realizes the above-mentioned structure, as shown in FIG. 3, from the pressure contact portion 3 to the folded portion 2
There are cases where a design is adopted that has a shape that changes into a gentle curve.

In the above design, as the chassis 6 moves downward, the portion where the pressure contact portion 3 and the chassis 6 are in pressure contact gradually move to the folded portion 2 side.

[0006] However, with such a shift of the pressure contact portion, friction is inevitably generated between the chassis 6 and the pressure contact portion 3 due to the pressure contact, which inevitably causes wear of the pressure contact portion 3. Absent.

Further, in the area of the pressure contact portion 3, gold plating is often performed in order to prevent wear and corrosion, but when the area of pressure contact is wide as in the above design, a wide range of gold plating is performed. Is required, and it is extremely uneconomical.

Apart from the design shown in FIG. 3, as shown in FIG. 4, the pressure contact portion 3 has a shape protruding upward, and the connection portion 23 connecting between the folded portion 2 and the pressure contact portion 3 has a bottom portion 1. In some cases, a design that is substantially parallel to is adopted.

In the case of the above design, since the width of the region in contact with the chassis 6 is relatively narrow, there is a risk that the pressure contact portion 3 will be worn due to the dynamic friction with the chassis 6 as in the case of the design shown in FIG. And it is possible to avoid the uneconomicalness due to the wide range of gold plating.

However, since the press contact portion 3 is substantially parallel to the bottom portion 1, the vertical width of the folded portion 2 becomes large, and the area of the folded portion 2 is inevitably large.

Therefore, in order to elastically deform the folded-back portion 2, a large bending moment is required as compared with the structure shown in FIG.

The extent of the folded portion 2 and the bending moment depends on the length of the connecting portion 23 in the left-right direction.
After all, in the case of the configuration shown in FIG. 4, since the required bending moment is large, when performing pressure contact with the chassis 6 by the same elastic force, compared to the design shown in FIG.
Since it is necessary to design the width of the connecting portion 23 in the left-right direction to be large, it is inevitable that a problem will occur in the basic problem of the contact terminal of compact design.

[0013]

The present invention is based on FIG. 3 and FIG.
It is an object of the present invention to provide a contact terminal structure capable of overcoming the design drawbacks of the prior art as shown in FIG. 1 and realizing both design advantages.

[0014]

In order to solve the above-mentioned problems, the structure of the present invention is such that a bottom portion having a joint surface capable of joining to a lower substrate via solder and an upper chassis are pressure-welded. Section, which is elastically deformed on one side of the left and right sides and has a folded shape from the bottom toward the pressure contact section, and engages with a lower piece extending from the pressure contact section on the other side of the left and right sides. In addition, in the contact terminal having a stopper that prevents the pressure contact portion from moving upward due to the elastic force of the return portion, the pressure contact portion has a shape protruding upward, and the return portion and the pressure contact portion The contact terminal is based on the fact that at least the portion of the connecting portion that connects with the fold-back portion is connected to the fold-back portion and extends obliquely upward from the fold-back portion.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION FIGS. 1 (a), 1 (b) and 1 (c) are
An embodiment of the present invention is shown. (A) uses the entire area of the bottom 1 as a joint surface 11 via the substrate 5 and the solder 7, while (b) shows one recess 12 provided in the bottom 1. One side is the joint surface 11, and (c) shows the inside of the two recesses 12 provided in the bottom 1 as the joint surface.

As shown in FIG. 1, in the connecting portion 23, the folded-back portion 2 extends obliquely upward, while the press-contact portion 3 is provided.
Has a shape protruding upward from the connecting portion 23.

Since the press contact portion 3 has a shape protruding upward, the present invention does not need to present the connection portion 23 that is gently curved from the folded portion 2 as in the case of the conventional example shown in FIG. .

Due to such a shape of the pressure contact portion 3, the area where the pressure contact portion 3 is in pressure contact with the chassis 6 is narrow, and like the conventional example shown in FIG. 3, the pressure contact portion 3 due to dynamic friction with the chassis 6 is formed. Wear can be avoided, and the width of gold plating in the region of pressure contact can be narrowed.

On the other hand, as shown in FIG. 1, in the connecting portion 23 between the folded-back portion 2 and the pressure contact portion 3, since the folded-back portion 2 extends obliquely upward, the radius of curvature of the folded-back portion 2 is Compared with the case of the conventional example shown in FIG. 4, the design can be made smaller, and the bending moment required to elastically bend the folded portion 2 can be designed smaller.

Based on the selection of the angle of the connecting portion 23, the left and right directions of the connecting portion 23 necessary to maintain the elastic force based on the bending moment required to withstand the pressure contact with the chassis 6 in the pressure contact portion 3. The length can be designed smaller than in the case of the prior art shown in FIG.

FIG. 5 shows a specific example of the engagement relationship between the lower piece 31 of the press contact portion and the upper portion of the stopper.
In the above, the lower piece 31 is branched into two pieces on the lower side, is joined at the lower end in the front-rear direction, and is engaged with the left-right piece at the upper part of the stopper.
The engagement relationship between 1 and the stopper is not limited to the specific example shown in FIG. The engagement relationship shown in FIG. 5 is also adopted in the conventional example shown in FIGS. 3 and 4.

A description will be given below according to an embodiment.

[0023]

FIG. 2 shows a typical embodiment of the invention,
In FIG. 2, unlike the case of FIG. 1, not all the connecting portions 23 are extended obliquely, but a design that is substantially parallel to the bottom portion 1 is adopted on the side connected to the press contact portion 3.
As described above, since a certain large width can be secured in the vertical direction in the portion where some of the connecting portions 23 are substantially parallel to the bottom portion 1, the contact terminals are automatically mounted at a predetermined portion at a high speed. It is possible and extremely convenient.

Moreover, in the design of the embodiment, as shown in FIG. 2 (a), the angle when the connecting portion 23 extends obliquely upward from the folded-back portion 2 with reference to the bottom portion 1 is shown in FIG. As in the case of No. 1, it is possible to design larger than the case where all the connecting portions 23 are extended obliquely upward.

Designing the angle to be large means that the degree of deformation of the curved portion is small when the angle of the folded-back portion 2 becomes small by moving downward due to pressure contact with the chassis 6 at the pressure contact portion 3. Meaning,
Eventually, it contributes to reducing the fatigue of the folded portion 2.

Moreover, when the chassis 6 is pressed from the upper side, as shown in FIG. 2B, when the lower end extended from the pressure contact part 3 contacts the bottom part 1, the connecting part 23 is slanted upward. The highest part by the end of the extended part and the top part of the press contact part 3 are set to substantially the same level in the vertical direction, so that it is possible to press contact with the chassis 6 at two positions in the left and right direction. Can contribute to support in a stable state.

[0027]

As described above, the present invention overcomes the drawbacks of the prior arts shown in FIGS. 3 and 4 by improving the prior arts, and makes full use of the advantages of these prior arts. be able to.

Moreover, in the embodiment, depending on the design, it is possible to realize the pressure contact itself at two places with respect to the chassis, and the value of the present invention is great.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention, (a)
Shows the case where the entire area of the bottom is used as the joint surface,
(B) shows the case where one side of one recess provided in the bottom is used as the joint surface, and (c) shows the case where the inside of the two recesses provided in the bottom is used as the joint surface.

FIG. 2 is a front view showing the configuration of the embodiment of the present invention,
(A) shows a case where the chassis is not in a pressure contact state, and (b) shows a case where the chassis is press-contacted and the chassis is supported by two places.

FIG. 3 is a front view showing a configuration of a conventional technique in which a connection portion from a folded portion to a pressure contact portion is designed to be connected in a smoothly continuous shape.

FIG. 4 is a front view showing a configuration of a conventional technique having a shape in which a connection portion is designed to be substantially parallel to a bottom portion between a pressure contact portion having a shape protruding upward from a folded portion.

FIG. 5 is a side view showing an engagement relationship between a lower piece of the pressure contact portion and a stopper.

[Explanation of symbols]

1 bottom 11 Bonding surface 12 recess 2 Folded part 23 Connection 3 Pressure contact part 31 Lower piece of pressure contact part 4 Engagement part 5 substrates 6 chassis 7 Solder

Claims (3)

[Claims] 1. A bottom portion having a joining surface capable of joining to a lower substrate via solder, a pressure-contacting portion for pressure-contacting an upper-side chassis, and elastically deforming on one of the left and right sides and pressure-contacting from the bottom portion. The folded portion that has a folded shape toward the portion,
Contact with the other of the left and right sides, which has a stopper that engages with the lower piece that extends from the pressure contact portion and that prevents the pressure contact portion from moving upward due to the elastic force of the folded portion. In the terminal, the pressure contact part has a shape protruding upwards,
In addition, a contact terminal based on at least a portion of the connecting portion connecting the folded-back portion and the pressure-contacting portion, which is connected to the folded-back portion, extending obliquely upward from the folded-back portion. 2. The contact terminal according to claim 1, wherein the portion of the connecting portion on the side connected to the pressure contact portion is designed to be substantially parallel to the bottom portion. 3. The design is such that the top of the press contact part and the highest part of the connection part are substantially at the same height when the press contact part reaches a position near the lowest position due to press contact with the chassis. The contact terminal according to claim 2, wherein