JPH088124B2 - contact - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact, and more particularly to a contact whose contact reliability is improved by the shape of a contact portion formed at the tip of an elastically deformable portion.

[0002]

2. Description of the Related Art First, regarding this type of contact, FIG.
Will be described with reference to. The illustrated contact 3 has a terminal portion 32 formed at one end of a fixed portion 31 that is fixedly supported by a housing or a printed circuit board, and a contact portion 34 at the tip formed at the other end as well. The elastically deformable portion 33 is provided. For example, when the contact 3 is used as a female contact and the pin contact is used as a male contact, the contact portion 34 is pressed downward by the tip of the pin contact to press the contact 3 and the pin contact, As a result, the contact 3 and the pin contact are electrically connected.

[0003]

By the way, in this type of contact, the deformation amount of the elastically deformable portion is designed to allow the manufacturing tolerance of the connector. However, the deformation amount varies within the tolerance. The contact force is greatly affected by this, and if the contact force is too low, the contact reliability is impaired. Therefore, in general, the contact force is currently set to be slightly higher. However, when the contact force is increased as described above, the friction force at the time of fitting or inserting / removing the contact is also increased accordingly, and as a result, the wear of the contact portion of the contact is accelerated, resulting in a long-term contact reliability of the contact. It is a factor to be damaged.

An object of the present invention is to provide a contact capable of ensuring contact reliability for a long period of time.

[0005]

According to the present invention, there is provided a contact having a contact portion formed on one end side of the elastically deformable portion, the contact portion being formed continuously with the elastically deformable portion. A first contact point and a second contact point that is continuous with the first contact point through an elastically deformable piece, and the elastically deformable piece prevents the first and second contact points from overlapping with each other. Folding back the second contact to the first contact side and forming a step between the second contact and the first contact in a state where no contact force is applied to the first and second contacts. A contact is provided, wherein a portion is provided, and the second contact is positioned above the first contact when no contact force is applied to the first and second contacts. Is obtained.

[0006]

In the present invention, when a contact force is applied to the contact,
Due to the elastic deformation of the elastic deformation piece, the step is eliminated,
The second contact elastically deforms until the first and second contacts are flush. When the contact force is further applied, the elastically deformable portion is elastically deformed, but the elastically deformable piece is not further deformed. Therefore, the contact force at the second contact can be kept constant without being influenced by the displacement amount at the contact elastically deformable portion, and as a result, the contact reliability of the contact can be ensured for a long period of time.

[0007]

Embodiments of the present invention will be described below. Figure 1 (a)
, (B) show contacts according to the present invention. The contact 1 shown in FIG. 1 (a) includes a pair of first contacts 141 formed on both sides of the elastically deformable portion 13 continuously, and a second contact formed adjacent to the central portion of the first contacts 141.
Contact 143 of The second contact point 143 and the two first contact points 141 are continuous via an elastic deformation piece 142 having a substantially W-shaped folded portion. Then, in a state where no contact force is applied to the illustrated first contact 141 and second contact 143, the upper surface of the second contact 143 is located above the upper surface of the first contact 141 by the step t1. .

The contact 2 shown in FIG. 1 (b) has a first contact 241 formed continuously with the elastically deforming portion 23 and a second contact 243 formed adjacent to the first contact 241. The first contact point 241 and the second contact point 243 are continuous via the elastic deformation piece 242 having a substantially U-shaped folded portion. Further, similar to the contact shown in FIG. 1A, when no contact force is applied to the first contact 241 and the second contact 243, the upper surface of the second contact 243 and the first contact 241 are A step t2 is provided between them.

The contacts 1 and 2 are shown in FIG.
Similar to the contact 3 described in 1., the elastic deformation portion 1 in the figure
On the left side of 3, 23, there are provided a fixing portion fixedly supported by a housing or a printed circuit board, and a terminal portion formed at one end of the fixing portion, but the illustration is omitted for convenience of explanation. Then, for example, when these contacts 1 and 2 are used as female contacts and the pin contact is used as a male contact, by pressing the contact portions 14 and 24 downward by the tip of the pin contact,
That is, the contacts 1 and 2 and the pin contact are brought into pressure contact with each other to establish electrical continuity between them.

The displacement of each contact of the contact portion 24 when such contact is made in the contact 2 will be described below with reference to FIGS. 2 and 3. When the contact portion 24 is fitted with the pin contact or the card edge, the contact force at this time first pushes down the second contact 243, and as a result, the elastic deformation piece 242 is elastically deformed. The first contact 241 and the second contact 24
The level difference with 3 is almost eliminated, and these contacts come into contact with the same surface of the contact such as the pin connector.

This is the state I shown in FIG.
Contact 243 of the contact force P required to reach this state.
A acts, while the first contact 241 has a contact force PB corresponding to the deformed state of the entire contact.
This contact 2 is the smallest displacement that causes this condition.
The minimum amount of contact displacement allowed by δMIN.

Next, a case where the contact force applied to the terminal portion 24 is large and the displacement amount of the terminal portion 24 is a displacement amount δ larger than the minimum contact displacement amount δMIN will be described. In this case,
Since the contact force applied to the second contact 243 remains at PA, the deformed state of the elastic deformation piece 242 does not change. On the other hand, the contact force PB at the first contact point 241 has a value corresponding to this displacement amount δ, and this force is transmitted to the elastically deformable portion 2, so that the contact point portion 24 as a whole is further elastically deformed by the elastically deformable portion 2. Move down. This state is shown in II. As the amount of displacement increases, the elastically deformable portion 2 of the contact 2
There is a point when the plastic deformation starts. The amount of displacement at this time is the maximum amount of displacement δMAX.

The contact force PA acting on the second contact 243 is set to a minimum value necessary for stable contact between the contact portion of the contact 2 and the corresponding pin contact, that is, the minimum contact displacement amount. By setting δMIN <displacement amount δ <maximum deformation amount δMAX, the contact force PA at the second contact 243 can be kept constant and permanent deformation of the contact 2 can be prevented. Further, within the range of this maximum deformation amount δMAX, the contact force between the pin contact and the second contact can be kept constant even if the diameter of the counterpart pin contact or the like changes to some extent.

[0014]

As described above, according to the contact of the present invention, the contact force at the second contact can be kept constant without being influenced by the displacement amount at the elastically deformable portion of the contact. There is an effect that it can be secured over.

[Brief description of drawings]

1 is an illustration of an embodiment of a contact according to the present invention.

FIG. 2 is an explanatory view of a state where the contact of FIG. 1 is elastically deformed by applying a contact force to a second contact.

FIG. 3 is an explanatory diagram showing a transition of elastic deformation when a contact force is applied to the contact of FIG.

FIG. 4 is an explanatory diagram of a conventional contact.

[Explanation of symbols]

 1 Contact 2 Contact 3 Contact 13 Elastic Deformation Part 14 Contact Part 23 Elastic Deformation Part 24 Contact Part 31 Fixed Part 32 Terminal Part 33 Elastic Deformation Part 34 Contact Part 141 First Contact 142 Elastic Deformation Piece 143 Second Contact 241 First Contact point 242 elastic deformation piece 243 second contact point

Claims (1)

[Claims] 1. A contact including a contact portion formed on one end side of an elastically deformable portion, wherein the contact portion is a first contact formed continuously with the elastically deformable portion, and the first contact. A second contact that is continuous through an elastic deformation piece,
The elastic deformation piece is prevented from overlapping the first and second contacts, and the second contact is folded back toward the first contact side so that no contact force is applied to the first and second contacts. In the state, a folded-back portion that forms a step between the second contact and the first contact is provided, and the second contact is provided when a contact force is not applied to the first and second contacts. The contact is located above the first contact.