JPH03145011A - Flat wire with shield and its manufacture - Google Patents

Abstract

PURPOSE:To maintain a high reliability of connection and to prevent a breakage of a conductor by laminating a solder layer on one side of a metal layer to compose a shield layer, and attaching the shield layer along the whole length of the surface of a conductor to be the grand line through the solder layer. CONSTITUTION:The surface of a conductor to be the grand line 11a is exposed from an insulator layer 12 along the whole length, a shield layer 13 is composed by laminating solder layers 15 on one side surface of a metal layer 14, and the shield layer 13 is attached to the surface of the conductor to be the grand line 11a through the solder layer 15 along the whole length. Since the shield layer 13 and the grand line 11a are attached along the whole length through the metal layer 15 in such a way, the connection is solidified, and the connecting condition can be uniformed in the longitudinal direction. As a result, no stress concentration is generated even though the wire is bent, and the both members are hardly removed. Consequently, the reliability of connection of the grand line 11a and the shield layer 13 is increased, and a peeling-off, a breakage of the conductor, and the like are not generated.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a shielded flat electric wire, and particularly to a shielded flat electric wire that improves the reliability of the connection between a ground wire and a shield, and a method for manufacturing the same.

``Conventional technology'' Conventionally, compact and flexible flat electric wires have been widely used for wiring between printed wiring boards of electronic devices, but in recent years, the demand for shielded wires has increased due to problems such as radiated noise. There is.

As such a flat electric wire, a shield tape electric wire 12 as shown in FIGS. 4 and 5, respectively, is known. These shield tape electric wires 1.degree. 2 have a plurality of conductors 3a, 3b, as shown in the figure.

3c and '3d are arranged parallel to each other in the same plane, and the whole of these conductors is sandwiched and connected together with insulating tape 4.4 from both sides, and further, these insulating tapes 4, 4
This is achieved by covering the entire conductor with shield tape 5.

Among these, in the shield tape electric wire 1, the surface of the conductor 3b which becomes a ground wire is exposed from one of the insulating tapes 4, and the conductor 3b and the shield tape 5 are brought into contact with each other to establish continuity between the two. In this case, an insulating adhesive was applied in stripes to the shield tape 5, and the shield tape 5 was adhered thereto.

In addition, the shield tape electric wire 2 is as shown in FIG.
The conductor 3b and the shield tape 5 are welded at positions A at a constant interval in the longitudinal direction.

"Problems to be Solved by the Invention" The conventional shield tape N wire described above had the following points to be improved.

First, in the shield tape 'i*i, the conductor 3b, which becomes the ground wire, and the shield tape 5 are adhered with an insulating adhesive applied to the shield tape 5 in a stripe shape, and both are bonded to the surface B of the conductor 3b. In this case, the metal surfaces are simply in contact with each other.

Therefore, due to the growth of an oxide film on the metal surface and the peeling of the adhesive part, the conductor 3b may be bent at a particularly small curvature or used repeatedly.
The conduction between the shield tape 5 and the shield tape 5 may become unstable during long-term use, and the shielding effect of the shield tape 5 may not be sufficiently exhibited.

In addition, the shield tape electric wire 2 is spot-welded at regular intervals as described above, but when used in a curved state, stress is concentrated on the spot-welded portion A, causing the above-mentioned The bond between the conductor 3b and the shield tape 5 may peel off, and the conduction between them may become unstable.

Furthermore, since the conductor 3b is damaged by spot welding, if the conductor 3b is used in a curved state, there is a possibility that the conductor 3b will break at that part A, which detracts from the original feature of the shielded flat wire that it can be used flexibly. It had the disadvantage that it could not be used without problems.

The present invention was made in view of the above-mentioned conventional problems, and is a shielded flat 11 wire in which the connection between the ground wire and the shield is made with high reliability. The object of the present invention is to provide a shielded flat electric wire that does not cause peeling from the shield or breakage of the conductor, and a method for manufacturing the same.

"Means for Solving the Problems" The shielded flat electric wire of the present invention includes a plurality of conductors arranged in parallel to each other in the same plane, an insulating layer covering the entirety of these conductors, and a surface of the insulating layer. A shielded flat electric wire consisting of a shield layer covering the conductor, the surface of the conductor serving as the ground wire is exposed over the entire length from the insulating layer, and the shield layer is a metal layer with a solder layer laminated on one side. It is characterized in that it is bonded over its entire length to the surface of the conductor that becomes the ground line via the solder layer.

In addition, in the method for manufacturing a shielded flat electric wire of the present invention, m number of conductors are arranged in parallel to each other in the same plane, and after bonding an insulating layer so as to cover the whole of these conductors, A method for manufacturing the shielded flat electric wire by exposing the entire length of the surface of the conductor from the insulating layer, and further adhering a shield layer to cover the surface of the insulating layer and the ground wire, the method comprising: is formed by laminating a first adhesive layer on one side of an insulating layer and a second adhesive layer having a lower melting point than the first adhesive layer on the other side, and the insulating layer and the conductor is characterized in that the shield layer and the insulating layer are bonded together by the second adhesive layer, and the shield layer and the insulating layer are bonded together by the first adhesive layer.

"Function" The shielded flat electric wire of the present invention has t! It is worn. For this reason, these connections are stronger than conventional shielded flat wires in which the metal surfaces of the wires are simply in contact with each other, and the connection condition can be made uniform in the longitudinal direction. Therefore, even if it is bent, stress concentration does not occur and separation between the two is unlikely to occur.

Moreover, solder is better against temperature changes than adhesives made of synthetic resin, etc., so it is 11! The reliability of the connection between the ground line and the shield is extremely high even in an environment with rapid temperature changes. Further, since the shield layer can be attached by heat compression bonding and manufactured without damaging the ground wire, the ground wire will not break even under severe usage conditions.

Furthermore, according to the manufacturing method of the present invention, since the insulating layer and the shield layer are firmly bonded by the first adhesive layer of the insulating layer, the entire shield layer is bonded uniformly and firmly in the longitudinal direction. Moreover, it is possible to obtain a shielded flat electric wire in which the shield layer and the ground wire are connected with high reliability by metal bonding.

In addition, since the first adhesive layer is said to have a higher @ point than the second adhesive layer placed inside to sandwich the conductor, the attachment of the insulating layer is performed on the first adhesive layer located on the surface. This can be easily carried out by heat-pressing using a normal hot roll without causing the adhesive layer to flow.

``Example'' An example of the present invention will be described below with reference to FIGS. 1 to 3.

In FIG. 3, what is generally designated by the reference numeral 10 is a shielded tape electric wire (shielded flat wire) which is an embodiment of the present invention. The shield tape electric wire 10 is made of rectangular conductors 11a, llb, llc with a thickness of about 35 μm.
, lids are arranged parallel to each other in the same plane, and the entirety of these conductors is covered with insulating tape (insulating layer) 12 from both sides.
．． 12 to connect them together, and then apply shield tape (shield layer) to sandwich and cover the whole of them.
13.13 is attached.

In the shield tape electric wire 10, one surface of the conductor 11a, which serves as a ground wire, is exposed from the insulating tape 12 over its entire length.

Further, as shown in FIGS. 1 and 2, the shield tape 13 has a solder layer 1 on one side of the metal layer 14 with a thickness of about 9 μm.
The conductor 11. It is bonded to the surface of a over its entire length. Further, both ends of the shield tape 13.13 in the width direction are bonded to each other by a solder layer 15.15. Here, copper foil or the like can be used as the metal layer 14, and the solder layer IS can be formed by plating.

In addition, as shown in FIGS. 1 and 2, the insulating tape 12 has a first adhesive layer 17 laminated on one side of the insulating layer 16, and a second adhesive layer 17 having a lower melting point than the first adhesive layer on the other side. Second adhesive layer 18
The second adhesive R1B is placed on the inside.

Here, a polyester adhesive having a melting point of about 264° C. and a thickness of about 25 μm can be used as the insulating layer 16, and a polyester adhesive having a melting point of about 187° C. can be used for the first adhesive layer 17. The second adhesive layer 18 has a melting point of about 140
°C PVC adhesive adhesive can be used.

The shield tape electric wire 10 having the above structure can be manufactured by the following procedure.

That is, first, conductors lla, l arranged on the same plane
! b, llc, and lid are sandwiched between insulating tapes 12.12 with the second adhesive layer 18.18 inside, and the surface temperature of the first adhesive layer 17 is higher than the melting point of the second adhesive layer 18.
The conductors and the insulating layer 16 are bonded together by pressing with a hot roll at a temperature lower than the melting point of the conductor (for example, 170° C.), melting only the second adhesive layer 18, and integrally connecting each conductor and the insulating layer 16 with the adhesive layer 18.

Next, the part of one insulating tape 12 located on the surface of the conductor 11a is peeled off over its entire length to expose one surface of the conductor 11a, and then the whole is covered with shield tapes 13, 13 with the solder layer 15 inside. The solder layer z5 may be sandwiched and crimped using hot rolls at a temperature higher than the melting point of the solder layer z5 (190 to 21Q'C) and lower than the melting point of the insulating layer 16 (about 264°C).

As a result, the first adhesive layer 17 as well as the solder layer 15
is melted, and the exposed surface of the conductor 11a and the metal layer 14 are reliably bonded via the metal solder layer 15, and the insulator layer 16 and the shield tape 13 are bonded to each other via the adhesive layer 1.
7, it is firmly adhered.

The shield tape electric wire 10 of this embodiment has the following features.

That is, the shield tape 13 and the ground wire 11a are bonded uniformly in the longitudinal direction by a metal layer (solder layer 15) that is resistant to temperature changes. For this reason, these electrical connections are stronger than conventional shielded tape wires in which the metal surfaces of the wires are simply in contact with each other, and there is no stress concentration even when the wires are bent, making them reliable. A highly flexible connection has been achieved. On the other hand, the insulating tape 12 and the shield tape 13 are connected to the first adhesive layer 1.
It is firmly bonded via 7.

Therefore, the entire shield tape 13 is bonded uniformly and firmly in the longitudinal direction, and the shield tape 13 and the ground wire (conductor 11a) are connected with high reliability, and the bending characteristics as a whole are good. It is a shield tape electric wire that can fully demonstrate the shielding effect.

Further, the insulating tape 12 and the shielding tape 13 can be attached by heat-pressing using a normal heat roll, and can be easily manufactured using conventional manufacturing techniques.

"Effects of the Invention" In the shielded flat electric wire of the present invention, since the connection between the shield layer and the ground wire is made through the solder layer, the connection is maintained with high reliability, and the conductor is less likely to break. This has the effect of being able to exhibit stable shielding performance against radiation noise.

Furthermore, according to the manufacturing method of the present invention, since the entire shield tape is bonded uniformly and firmly in the longitudinal direction, there is an effect that a shielded tape electric wire having even better bending properties as a whole can be obtained. In addition, the insulating layer and the shield layer can be bonded together by hot press bonding using a normal hot roll, and the shielded flat electric wire having the above-mentioned characteristics can be easily manufactured using conventional manufacturing techniques.

[Brief explanation of the drawing]

FIGS. 1 to 3 are diagrams showing an embodiment of the present invention,
Figure 1 is a partial cross-sectional view of a shielded flat wire, Figure 2
The figure is a cross-sectional view taken along the line ■--■ in FIG. 1, and FIG. 3 is a perspective view of the shielded flat electric wire. Moreover, FIGS. 4 to 6 are diagrams showing conventional shielded flat electric wires, and FIGS. 4 and 5 are cross-sectional views of the shielded flat electric wires, respectively, and FIG.
It is a Vl sectional view. Shielded flat wire (shield tape wire), 11b, lie, lld... Conductor (lla
...Ground wire) insulation layer (insulation tape), -shield layer (shield tape), ...metal layer, 15 ...solder layer, ...insulator layer,
17...First adhesive layer,...Second adhesive layer. ○ 1a 2 3 14... l 6... 18...

Claims (2)

[Claims] (1) A shielded flat electric wire consisting of a plurality of conductors arranged in parallel to each other in the same plane, an insulating layer that covers the entirety of these conductors, and a shield layer that further covers the surface of the insulating layer, The insulating layer is partially removed over the entire length of the surface of the conductor that becomes the ground line, and the shield layer is formed by laminating a solder layer on one side of a metal layer. A shielded flat electric wire, characterized in that the shielded flat electric wire is bonded over its entire length to the surface of the conductor that becomes the ground wire. (2) After arranging a plurality of conductors parallel to each other in the same plane and bonding an insulating layer to cover the entirety of these conductors, the surface of the conductor that will become the ground line is exposed over its entire length from the insulating layer. A method for manufacturing a shielded flat electric wire according to claim 1, further comprising bonding a shield layer so as to cover the surfaces of the insulating layer and the ground wire, the method comprising: applying the insulating layer to one surface of the insulating layer; A first adhesive layer is laminated, and a second adhesive layer having a melting point lower than that of the first adhesive layer is laminated on the other side, and the insulating layer and the conductor are connected to each other by the second adhesive layer. 2. The method of manufacturing a shielded flat electric wire according to claim 1, wherein the shield layer and the insulating layer are bonded together by the first adhesive layer.