JPH089855Y2 - Flexible member including flexible conductive portion - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to improvement of the structure of a flexible member including a flexible conductive portion such as a tape-shaped electric wire and a flexible substrate, and more particularly to a flexible member having an improved connection portion. A flexible member including a conductive portion.

Description of Prior Art Conventionally, in order to reduce the size and weight of electronic devices,
A flexible member including a flexible conductive portion such as a tape-shaped electric wire or a flexible substrate is widely used.
FIG. 1 is a sectional view schematically showing a tape-shaped electric wire as an example of a conventional flexible member of this type. The tape-shaped electric wire 1 includes a conductor 2 as a flexible conductive portion and an insulating layer 3 covering the conductor 2.

By the way, at the connection end of the tape-shaped electric wire 1, as is apparent from FIG. 1, the conductor 2 is exposed, and a relatively hard reinforcing layer 4 is formed so as to connect the exposed portion 2a and the insulating layer 3. It is provided. The reinforcing layer 4 is provided to keep the connecting portion rigid and to make the other portions flexible when connecting with a connector (not shown), and to improve the fitting property with the connector. .

By the way, when connecting to a flexible conductive portion of a flexible member such as a tape-shaped electric wire or a flexible substrate, a card edge type connector is excellent as a connector in terms of price, workability and reliability. Widely used. The connection state with this card edge type connector is shown in FIG. 2 in a schematic partially cutaway sectional view. As is clear from FIG. 2, not only the conductor 2 but also the reinforcing layer 4 is fitted in the groove 5a of the connector 5, and therefore the connecting portion is reinforced, even if the conductor 2 is illustrated. Even if it is bent like this, it is ensured that good joining performance is obtained.

However, as also shown in the schematic cross-sectional view in FIG. 3, when the tape-shaped electric wire 1 is fitted into the connector 5 and the tape-shaped electric wire 1 is shaken by applying a load F, the reinforcing layer 4 peels off. However, there is a drawback that the conductor 2 is easily broken. This is because, while the conductor 2 of the tape-shaped electric wire 1 is soft, on the other hand, the reinforcing layer 4 that reinforces the connecting portion is relatively hard, so that the total load concentrates on the boundary portion between the reinforcing layer 4 and the insulating layer 3, It is considered that the reinforcing layer 4 is peeled off. Further, after the reinforcing layer 4 is peeled off, the load applied to the tape-shaped electric wire 1 is applied only to the conductor 2, so that it is considered that disconnection occurs. The above-mentioned drawbacks described with reference to FIG. 2 and FIG. 3 are phenomena inside the actual equipment, but as shown in FIG. 4, a load is applied to the tape-shaped electric wire 1 in the arrow F direction. , 5 has been confirmed by an experiment in which the connector 5 is repeatedly circularly moved in the directions of arrows A and B.

As described above, in the conventional tape-shaped electric wire 1, the reinforcing layer 4
There was a drawback that the conductor was broken due to the peeling off of the conductor, but this problem was the same in the flexible substrate having the reinforcing layer at the connecting portion.

Therefore, an object of the present invention is to provide a flexible conductive portion which can solve the above-mentioned drawbacks and dramatically improve the peeling strength of the reinforcing layer, and therefore can dramatically eliminate the disconnection accident of the conductor. To provide a flexible member including.

SUMMARY OF THE INVENTION The present invention is summarized as follows: a flexible conductive part, an insulating layer coated on the conductive part so as to expose an end of the conductive part as a connection end, and a connection of the conductive part. A reinforcing layer that connects the exposed portion near the end and the insulating layer is provided, so that both the reinforcing member and the insulating layer are connected to each other. A flexible member including a flexible conductive portion, which is provided with a thin re-reinforced layer.

Hereinafter, the details of the present invention will be clarified by describing an embodiment with reference to the drawings.

Description of Embodiment FIG. 5 is a partially cutaway sectional view showing an embodiment of the present invention. The feature of the present invention is that a re-reinforcing layer having a thickness smaller than that of the reinforcing member is applied so as to connect the reinforcing layer 4 and the insulating layer 3 so as to extend over both the reinforcing layer 4 and the insulating layer 3. Especially. About other points, it has the same structure as the conventional tape-shaped electric wire 1 shown in FIG.

The re-reinforcing layer 11 can be made of a highly flexible member such as an adhesive tape or a heat-sealing tape, but any material can be used as long as it can improve the peel strength of the reinforcing layer 4. . When the heat-sealing tape is used as the re-strengthening layer 11, when the thickness is about 10 to 15 μm, the flexibility of the tape-shaped electric wire 1 is not impaired, and therefore, the breakage of the conductor 2 is less likely to occur. It has been confirmed that the appearance is also good.

In the embodiment shown in FIG. 5, since the re-strengthening layer 11 is provided as described above, even if the tape-shaped electric wire 1 is loaded even when the tape-shaped electric wire 1 is connected to the card edge type connector, As shown in FIG. 6, since the re-reinforcing layer 11 follows the movement of the tape-shaped electric wire 1, the possibility that the reinforcing layer 4 peels off is dramatically reduced. This is a reinforcement layer 11
This is because the stress is dispersed by the action of, and even if the stress is concentrated on the boundary portion between the reinforcing layer 4 and the insulating layer 3, only the re-reinforcing layer 11 is torn off or the re-reinforcing layer 11 is peeled off. Until this happens, peeling of the reinforcing layer 4 does not occur.
Then, unless the reinforcing layer 4 is peeled off, the load is not applied only to the conductor 2, so that it is understood that the number of times of bending to break the conductor 2 is dramatically increased.

Next, the concrete experimental results for the above-mentioned embodiment will be described. The conventional tape-shaped electric wire 1 shown in FIG.
The tape-shaped electric wire of the embodiment shown in the figure was prepared and placed in a constant temperature bath at a constant temperature and a constant humidity as shown in FIG.
After applying a load of g and leaving it at a temperature of 40 ° C for 96 hours,
The results shown in the table below were obtained.

As is clear from the above table, it can be seen that the example shown in FIG. 5 exhibits extremely excellent peeling resistance as compared with the conventional tape-shaped electric wire.

Next, the tape-shaped electric wire (A) shown in FIG. 1, the embodiment (B) of FIG. 5 using a thin heat-sealing film as the re-reinforcing layer 11 and the thick adhesive tape as the re-reinforcing layer 11 (however, , (Thinner than the reinforcing member) was used to prepare the example (C) of FIG. 5, and the temperature was set to 180 ° C. by the experimental method shown in FIG.
A bending test was performed to check the number of times the conductor 2 was broken.
The results are shown in Fig. 8. In addition, all three samples A, B, and C were prepared, and the number of disconnection was examined for each sample, and the average value thereof is shown in FIG.

As is clear from FIG. 8, according to this embodiment, the number of times of bending to break the conductor is considerably increased as compared with the conventional tape-shaped electric wire. It will be understood that, particularly when a thick adhesive tape (though thinner than the reinforcing member) is used as the re-reinforcing layer 11, the number of times of bending until breakage is drastically increased.

The embodiment shown in FIG. 5 is for a tape-shaped electric wire, but it goes without saying that the present invention is not limited to this and can be easily applied to a flexible substrate.

Effects of the Invention As described above, according to the present invention, a re-reinforcing layer that is thinner than the reinforcing member applied over the reinforcing member and the insulating layer is provided so as to connect both the reinforcing member and the insulating layer. Since it is provided, it is possible to dramatically improve the peeling strength of the reinforcing layer and the number of times of bending until the conductor is broken, and thus a flexible conductive portion with few failures that can correspond to the reduction in size and weight of electronic devices is provided. It is possible to obtain a flexible member including the same.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing a tape-shaped electric wire as a conventional flexible member. 2 and 3 are schematic partial cutaway sectional views for explaining the problems of the conventional tape-shaped electric wire. FIG. 4 is a partially cutaway cross-sectional view for explaining a method for testing the number of times of bending of a tape-shaped electric wire before breaking the conductor. FIG. 5 is a partially cutaway sectional view showing an embodiment of the present invention. FIG.
It is a partially cutaway cross-sectional view showing a state in which the embodiment shown in the drawing is connected to a connector and bent. FIG. 7 is a partial cutaway sectional view for explaining a test method for measuring the peel strength of the embodiment shown in FIG. FIG. 8 is a diagram showing the results of measuring the number of times of bending until the conductor is broken in the embodiment of the present invention. In the figure, 1 is a tape-shaped electric wire as a flexible member, 2
Is a conductor as a flexible conductive part, 2a is an exposed part of the conductor, 3
Is an insulating layer, 4 is a reinforcing member, and 11 is a re-reinforced layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toru Karuga 3-3 Satsuki-cho, Kanuma City, Tochigi Prefecture Sumitomo Electric Industries, Ltd. Kanto Works (72) Inventor Eiji Kikuchi 3-3 Satsuki-cho, Kanuma City, Tochigi Prefecture Sumitomo Electric Industry Co., Ltd. Kanto Works (72) Inventor Toru Miyashita 3-3 Satsuki-cho, Kanuma City, Tochigi Prefecture Sumitomo Electric Industries Co., Ltd. Kanto Works (56) Reference JP 58-1918 (JP, A) 59-110989 (JP, U) Actually opened 58-82718 (JP, U) Actually opened 59-39886 (JP, U)

Claims (3)

[Scope of utility model registration request] 1. A flexible conductive portion, an insulating layer coated on the conductive portion so as to expose a terminal of the conductive portion to form a connection end, and an exposed portion near the connection end of the conductive portion. In a flexible member including a flexible conductive portion, the insulating member being relatively harder than the conductive portion coated so as to connect the layer, a reinforcement applied across the reinforcing member and the insulating layer. A flexible member including a flexible conductive portion, comprising a re-reinforcing layer thinner than the member. 2. The flexible member including the flexible conductive portion according to claim 1, wherein the re-reinforcing layer is an adhesive tape. 3. A flexible member including a flexible conductive portion according to claim 1, wherein the re-reinforcing layer is a heat-adhesive tape.