JP2003133781A - Flat cable having shield layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earth connection for a shield layer without removing an insulating resin film on a flat cable including the shield layer. SOLUTION: There are provided a flat cable having a shield layer, and an earth terminal 12 on the surface of an insulating resin film 14 attached onto both sides of each of conductors 11 which are arranged parallelly at intervals. The flat cable is fixed to a shield layer 15, inside of which is formed of a conductive layer 16 and outside of which is formed of an insulating resin layer 17. The terminal 12 is formed of a piece of metal in an L-like shape. The conductive layer 16 appears out by removing the end of the shield layer 15 so as to be bent backward. The internal surface of the metal piece of the earth terminal 12 is adhered to the external surface of the conductive layer 16. The adhered portion is inserted into a die to be molded with a fixation resin member 18 which is made of polyamide resin. In this constitution, the flat cable and the earth terminal 12 are fixed together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat cable with a shield layer, and more particularly to a flat cable having a ground connection portion in advance.

[0002]

2. Description of the Related Art In recent years, many sensors and electronic devices have been attached to automobiles in order to enhance safety performance, running performance and comfort. Further, as the voltage of hybrid vehicles, electric vehicles, fuel cell vehicles, and the like increases, the demand for electromagnetic wave shielding is increasing. On the other hand, along with the modularization of automobile parts, not only ordinary round electric wires but also flat cables are being used for automobile wire harnesses. Therefore, also in the flat cable, since it is necessary to shield noise due to electromagnetic waves, a flat cable with a shield layer in which a conductive layer (shield layer) made of a metal foil is coated on the outer peripheral surface of the wire is used.

As shown in FIG. 10, this type of flat cable with a shield layer is arranged in parallel with a plurality of conductors 2 of the flat cable 1 and a ground connecting wire (drain wire) 3 for the shield layer in a plane beforehand. And these conductors 2
The front and back surfaces of the ground connection 3 are laminated with the insulating resin film 4, and a shield material such as a metal foil is fixed to the surface of the insulating resin film 4 to form the shield layer 5.
Shield layer 5 and drain wire 3 of the above flat cable 1
As a method for establishing electrical continuity with the shield layer 5, a method of peeling off a required portion 4a of the insulating resin film 4 interposed between the shield layer 5 and the drain wire 3 and directly contacting each other has been generally used. .

[0004]

However, in order to bring the shield layer 5 and the drain wire 3 into contact with each other, the work of peeling off the insulating resin film is troublesome and there is a problem in workability. To solve this problem, a method of melting and removing the insulating resin film 4 by ultrasonic waves, or a connection portion by a slit such as a triangular shape that can be pushed into the shield layer 5 like the flat cable 1 ′ shown in FIG. A method has also been proposed in which 6, 6 are provided, and the insulating film 4 is pierced by the acute-angled portions 6a, 6a at the tips by pushing in the connecting portions 6, 6 to make contact with the drain wire 3 (Japanese Patent Laid-Open No. 2-2120)
000-23447). However, even with the method described above, the work of removing the insulating film is still required, and there is a limit to improvement in workability.

The present invention has been made in view of the above problems, and an object thereof is to provide a ground connection portion of a shield layer without removing the insulating resin film.

[0006]

In order to solve the above-mentioned problems, the present invention firstly proposes that the inside is a conductive layer on the surface of an insulating resin film which is attached to both surfaces of conductors arranged in parallel at intervals. Consists of a flat cable with a shield layer, the outer side of which is fixed to a shield layer made of an insulating resin layer, and an L-shaped ground terminal made of a metal plate. The end portion of the shield layer is peeled off and folded back in two. By folding back, the conductive layer is exposed to the outer surface, and the lateral plate portion of the L-shaped ground terminal is adhered to the outer surface of the exposed conductive layer over the entire length in the width direction and fixed with resin. On the other hand, the vertical plate portion is projected on the side portion of the conductor exposed from the tip of the flat cable in parallel with these conductors and at the same pitch as the conductor pitch, and the vertical plate portion of the ground terminal is connected to the connector together with the conductor. It is composed It provides a flat cable with shielding layer, wherein the door.

The L-shaped ground terminal is a clip-shaped ground terminal in which the horizontal plate portion is formed of two metal pieces and the vertical plate portion is sandwiched and connected at one end thereof.
The shield layer folded back from both sides of the flat cable is sandwiched between the two metal plates, and the horizontal plate portion is tightly fixed to the conductive layers of the shield layers on both sides.

According to the above structure, since the horizontal plate portion of the ground terminal is in close contact with the conductive layer of the shield layer folded back, the ground terminal can be directly connected to the conductive layer of the shield layer, which is conventionally required. It is not necessary to remove the insulating resin film of the flat cable that has been cut. Further, since the contact portion is fixed by the resin, the horizontal plate portion of the ground terminal can be securely fixed at a required position on the shield layer. Further, by projecting the vertical plate portion of the ground terminal at the same pitch as the conductor of the flat cable, the ground terminal is inserted into the connector together with these conductors, and electrically connected to the ground terminal provided in the connector, thereby shielding. The earth connection of the layers can easily be made via the connector.

Secondly, according to the present invention, a shield layer having a conductive layer on the inner side and an insulating resin layer on the outer side is fixed to the surface of an insulating resin film attached to both surfaces of conductors arranged side by side with a gap. Consisting of a flat cable with a shield layer and an I-shaped ground terminal made of a metal plate to which a ground wire is connected. The conductive layer is formed on the outer surface by peeling the end of the shield layer and folding it back in two. (EN) A flat cable with a shield layer, characterized in that the ground terminal is exposed to the outside, and the ground terminal is closely adhered to the outer surface of the exposed conductive layer over the entire length in the width direction and fixed with resin.

The I-shaped ground terminal is a clip-shaped ground terminal which is formed of two metal pieces, and is connected with one end of which is sandwiched the core wire exposed from the end of the ground wire. The shield layers folded back from both sides of the flat cable are sandwiched between the two metal plates to be tightly fixed to the conductive layers of the shield layers on both sides.

That is, in the first invention, the ground terminal is L-shaped, but in the second invention, the ground terminal is I-shaped and the terminal of the ground wire is directly connected to the ground terminal. Specifically, the core wire exposed from the end of the ground wire is sandwiched at one end of two metal plates and soldered or welded, and the ground wire is fixed to the metal plate and at the same time, the two metal plates are also fixed and clipped. I am in a state. Even when this I-type ground terminal is used, since the conductive layer exposed on the outer surface by folding back the shield layer can be directly connected to the ground terminal, it is not necessary to remove the insulating resin film which has been conventionally required.

The flat cable with the shield layer and the ground terminal are fixed by resin-molding a contact portion between the folded conductive layer of the shield layer and the ground terminal in a mold.

The resin for molding the folded conductor of the flat cable with the shield layer and the ground terminal may be a thermoplastic resin made of polyamide or polyester resin, and a resin having a low viscosity is preferable. Further, when the resin sheet or the resin film is covered and melted by ultrasonic waves, a thermoplastic resin or a resin sheet or a resin film made of polyamide, polyester or polyolefin resin is preferably used. These resins may be used alone or may be blended so as to be easily melted by ultrasonic waves.

The ground terminal is made of a metal plate of copper, tin-plated copper or brass. When connecting the ground wire to the I-shaped ground terminal, a covered wire, a twisted metal wire, or a braided wire is used as the ground wire, and the other end of the ground wire is a vehicle body or the like. Grounded to.

[0015]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of the present invention, and a flat cable 1 having a shield layer 15 is shown.
An L-shaped ground terminal 12 is attached to 0, and is fixed by molding with a fixing resin material 18.

This flat cable 10 is used for a wire harness for an automobile, and as shown in FIG. 3A, a plurality of (three in the embodiment) conductors 11 are arranged in parallel at a constant pitch. Both the front and back surfaces are continuously bonded with the insulating resin film 14, and then the shield layers 15 are fixed to both surfaces. The shield layer 15 is configured by bonding a conductive layer 16 made of a copper foil and an insulating resin layer 17 made of a PET film, and is bonded to the upper and lower insulating resin films 14 with the conductive layer 16 inside. . In the present embodiment, the conductor 11 has a width of 1.5 mm,
It is formed from a thin copper plate having a thickness of 0.1 mm.

The L-shaped ground terminal 12 is in the form of a clip composed of a horizontal plate portion 12a made of two metal pieces and a vertical plate portion 12b which is connected to one end of the horizontal plate portion 12a. The horizontal plate portion 12a is to be electrically connected to the conductive layer 16 of the shield layer 15, and the vertical plate portion 12b is protruded at one side of the conductor 11 of the flat cable 10 at the same pitch as the conductor 11 so as to be connected to the conductor 11 together with the connector. It is inserted into (not shown) and electrically connected to the ground terminal housed in the connector. The vertical plate portion 12b is sandwiched at one end of the upper and lower horizontal plate portions 12a and fixed by soldering or welding, and the upper and lower horizontal plate portions 12a are also fixed to each other to form the above-mentioned clip shape with the other end opened. 2 of ground terminal 12
One horizontal plate portion 12a and one vertical plate portion 12b have the same shape,
In the present embodiment, a brass plate having a length of 13 mm, a width of 1.5 mm and a thickness of 0.1 mm is used, and the conductor 11 has the same width and the same thickness.

In order to connect the L-shaped ground terminal 12 to the flat cable 10, first, as shown in FIGS. 3A and 3B, the shield layers 15 on both upper and lower surfaces are required from the end of the flat cable 10. Width (width of about 5 mm in the embodiment)
Then, the conductive layer 16 is exposed to the surface by being folded back in two folds.

Next, as shown in FIG. 4, the L-shaped ground terminal 12 is attached from the side of the flat cable 10 so as to sandwich the folded back conductive layer 16 from above and below. In this state, the upper and lower horizontal plate portions 12a are in close contact with the upper and lower conductive layers 16 over the entire width direction, and
The vertical plate portion 12b is projected to one side of the conductor 11 exposed from the tip of the flat cable 10 at the same pitch P as that of the conductor 11 and has the same protrusion amount as the conductor 11.

The horizontal plate portion 12a of the ground terminal 12 is attached with the folded back portion of the shield layer 15 sandwiched between them. However, since it is not in a fixed state, the ground terminal 12 is fixed to the flat cable 10 and therefore grounded. Terminal 12
The fixing resin material 1 made of polyamide resin is inserted into the mold by inserting only the portion where the horizontal plate portion 12a of the above and the conductive layer 16 are in close contact with each other.
8 and mold the horizontal plate 12a to the flat cable 10
It is fixed to.

With the above structure, the flat cable 10 with a shield layer has a shape in which the ground terminal of the shield layer 15 is provided in advance. Therefore, the vertical plate portion 12b of the ground terminal 12
Can be easily grounded by connecting to the ground terminal housed in the connector only by connecting the connector with the conductor 11 of the flat cable 10.

FIG. 5 shows a second embodiment of the present invention. An L-shaped ground terminal 12 is attached to a flat cable 10 having a shield layer 15, and is sealed and fixed with a resin sheet 31. The flat cable 10 and the L-shaped ground terminal 12 used in the present embodiment are the first
It is similar to the embodiment.

The L-shaped ground terminal 12 is attached to the flat cable 10 by the same method as in the first embodiment, and the conductive layer 16 in which the shield layer 15 is folded back and the horizontal plate portion 12a of the L-shaped ground terminal 12 are attached. The contact portion with and is covered from both sides with a resin sheet 31, the resin sheet 31 is melted and sealed by an ultrasonic welding machine, and the L-shaped ground terminal 12 is fixed to the flat cable 10. The resin sheet 31 is a laminate of polyethylene and polyester, and the polyethylene layer is placed inside when the contact portion between the conductive layer 16 and the lateral plate portion 12a of the ground terminal 12 is covered. Also in the above configuration, the same effect as that of the first embodiment can be obtained.

FIGS. 6 to 8 show a third embodiment of the present invention. An I-shaped ground terminal 21 is attached to the flat cable 10 having the shield layer 15 and is fixed by molding with a fixing resin material 18. . The flat cable 10 used in this embodiment is the same as that in the first embodiment.

The I-shaped ground terminal 21 is formed of two metal pieces 21a, and a core wire 22a exposed at the end of the ground wire 22 is provided at one end thereof as shown in FIGS. 7 (A) and 7 (B). The two metal plates 21a are sandwiched at one end and soldered or welded, and the ground wire 22 is fixed to the metal plate 21a, and at the same time, the two metal plates 21a are also fixed by welding to form a clip shape. 2 of the I-shaped ground terminal 21
The metal pieces 21a have the same shape and, in the present embodiment, are made of a brass plate having a length of 13 mm, a width of 1.5 mm and a thickness of 0.1 mm.

As shown in FIG. 8, the I-shaped ground terminal 21 is attached from the side of the flat cable 10 so as to sandwich the folded back conductive layer 16 from above and below. In this state, the upper and lower metal pieces 21a are in close contact with the upper and lower conductive layers 16 over the entire length in the width direction.

Since the I-shaped ground terminal 21 is fixed to the flat cable 10, only the portion of the I-shaped ground terminal 21 where the metal piece 21a and the conductive layer 16 are in close contact with each other is made of gold as in the first embodiment. The metal piece 21a is inserted into the mold and is molded with the fixing resin material 18 made of polyamide resin to fix the metal piece 21a to the flat cable 10 to have the structure shown in FIG.

As described above, the I-shaped ground terminal 21 is provided.
Also in the case of using, the conductive layer 16 that is folded back of the shield layer 15 and exposed on the outer surface can be directly connected to the ground terminal 21, so that it is not necessary to remove the insulating resin film which is conventionally required. The other end of the ground wire 22 connected to the ground terminal 21 is grounded directly to the vehicle body or to a ground joint connector.

FIG. 9 shows a fourth embodiment of the present invention, in which an I-shaped ground terminal 21 is attached to the flat cable 10 having the shield layer 15, and like the second embodiment,
The resin sheet 31 is sealed and fixed. The flat cable 10 and the I-shaped ground terminal 21 used in this embodiment are the same as those in the third embodiment, and the resin sheet 31 is the same as that in the second embodiment.

The I-shaped ground terminal 21 is attached from the side of the flat cable 10 so as to sandwich the folded back conductive layer 16 from above and below. In this state, the upper and lower metal pieces 21a are in close contact with the upper and lower conductive layers over the entire width in the width direction. Then, in order to fix the I-shaped ground terminal 21 to the flat cable 10,
By the same method as in the second embodiment, the contact portion between the folded conductive layer of the shield layer and the I-shaped ground terminal 21 is covered from both sides with a resin sheet 31, and the resin sheet 31 is bonded by an ultrasonic welding machine. The I-shaped ground terminal 21 is fixed to the flat cable 10 by melting and sealing. Even with the above configuration, the same effect as that of the third embodiment can be obtained.

[0031]

As is apparent from the above description, according to the present invention, the metal piece of the ground terminal adheres to the conductive layer of the shield layer which is folded back, so that the ground terminal serves as the conductive layer of the shield layer. It can be directly connected, and it is not necessary to remove the insulating resin film of the flat cable which has been conventionally required. Further, since the contact portion is fixed by the resin, the ground terminal can be reliably fixed at a required position on the shield layer.

Further, when the above L-shaped ground terminal is used, the vertical plate portion of the ground terminal is projected at the same pitch as the conductor of the flat cable so that the ground terminal is inserted into the connector together with these conductors. By electrically connecting to the ground terminal provided in the connector, the ground connection of the shield layer can be easily made through the connector.

[Brief description of drawings]

FIG. 1 is a perspective view of a flat cable with a shield layer according to a first embodiment of the present invention.

FIG. 2 is a perspective view of an L-shaped ground terminal.

FIG. 3A is a perspective view of a shielded flat cable, and FIG. 3B is a sectional view taken along line I-I.

[Fig. 4] (A) is a flat cable with a shield layer and L
It is a perspective view showing a state in which a character-shaped ground terminal is attached,
(B) is a perspective view after mounting.

FIG. 5 is a perspective view of a flat cable with a shield layer according to a second embodiment of the present invention.

FIG. 6 is a perspective view of a flat cable with a shield layer according to a third embodiment of the present invention.

7A is a perspective view of an I-shaped ground terminal, and FIG. 7B is a front view.

FIG. 8 is a perspective view showing a state in which an I-shaped ground terminal is attached to a shielded flat cable.

FIG. 9 is a perspective view of a flat cable with a shield layer according to a fourth embodiment of the present invention.

FIG. 10 is a diagram showing a conventional example.

FIG. 11 is a diagram showing another conventional example.

[Explanation of symbols]

10 flat cable 11 conductors 12 L-shaped ground terminal 12a Horizontal plate part 12b Vertical plate part 14 Insulating resin film 15 Shield layer 16 Conductive layer 17 Insulating resin layer 18 Fixed resin material 21 I-shaped ground terminal 22 Ground wire 31 resin sheet

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5E023 AA04 AA06 BB06 BB09 BB23                       CC04 EE27 EE36 GG14 HH05                       HH12 HH16                 5E321 AA14 CC11 CC12 GG09                 5G309 FA04                 5G311 CA05 CB01 CC01 CD03 CE01                       CF02 CF04                 5G313 AA10 AB05 AC03 AD08

Claims (6)

[Claims] 1. A flat cable with a shield layer, in which a shield layer having a conductive layer on the inner side and an insulating resin layer on the outer side is fixed to the surface of an insulating resin film attached to both surfaces of conductors arranged in parallel at intervals. And an L-shaped ground terminal made of a metal plate. The end portion of the shield layer is peeled off and folded back in two to expose the conductive layer to the outer surface. The horizontal plate is attached to the exposed outer surface of the conductive layer over the entire length in the width direction by resin, while the vertical plate is attached to the side of the conductor exposed from the tip of the flat cable. A flat cable with a shield layer, characterized in that it is configured to project in parallel with these conductors and at the same pitch as the conductor pitch to connect the vertical plate portion of the ground terminal together with the conductor to the connector. 2. The L-shaped ground terminal is a clip-shaped ground terminal in which a horizontal plate portion is formed from two metal pieces and the vertical plate portion is sandwiched and connected at one end thereof. The flat cable with a shield layer according to claim 1, wherein the shield layer folded back from both sides of the flat cable is sandwiched between the two metal plates, and the horizontal plate portion is tightly fixed to the conductive layers of the shield layers on both sides. 3. A flat cable with a shield layer, in which a shield layer having a conductive layer on the inside and an insulating resin layer on the outside is fixed to the surface of an insulating resin film attached to both surfaces of conductors arranged in parallel at intervals. And an I-shaped ground terminal made of a metal plate to which a ground wire is connected, the end of the shield layer is peeled off and folded back in two to expose the conductive layer to the outer surface, and the ground A flat cable with a shield layer, in which terminals are closely attached to the outer surface of the exposed conductive layer over the entire length in the width direction and fixed with resin. 4. The clip-shaped ground terminal, wherein the I-shaped ground terminal is formed of two metal pieces, and the core wire exposed from the end of the ground wire is sandwiched at one end of the metal piece and connected. 4. The flat cable with a shield layer according to claim 3, wherein the shield layer folded back from both sides of the flat cable is sandwiched between the two metal plates and closely fixed to the conductive layers of the shield layers on both sides. 5. The grounding terminal is fixed to the flat cable by resin-molding a contact portion between the conductive layer folded back of the shield layer and the grounding terminal, and the grounding terminal is fixed to the flat cable. Flat cable with shield layer. 6. A resin sheet or a resin film covers the contact portion between the folded conductive layer of the shield layer and the ground terminal, and the ultrasonic welding machine melts and seals the resin sheet or resin film. 5. The ground terminal is fixed to the flat cable according to claim 1.
The flat cable with a shield layer according to any one of 1.