JP2003132981A - Ground wire connecting structure for shield-layer- attached flat cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ground wire connecting structure for a shield-layer- attached flat cable, by which the number of processes for connecting a ground wire can be reduced to improve work efficiency. SOLUTION: The ground wire connecting structure comprises the shield-layer- attached flat cable 10, and a connection terminal 20 consisting of a metal plate 21 to which a ground wire 30 is connected, the metal plate provided with projections 22 on the inner surface thereof, where the projection can be stuck to shield layers 15. The ends of the shield layers 15 are peeled off and are folded up backward to expose conductive layers 15. Then, the inner surface of the metal plate 21 is attached closely to the exposed surface of the conductive layers 15, where the projections 22 are stuck and fixed to the shield layers 15, and the ground wire 30 is connected to the shield layers 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for connecting a ground wire to a flat cable with a shield layer.
It is intended to improve the workability of connecting the ground wire to the flat cable with a shield layer.

[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. In this type of flat cable with a shield layer, a plurality of conductors 2 and drain lines 3 are arranged in parallel in a plane like a flat cable 1 shown in FIG.
Both the front and back surfaces of the drain wire 3 are continuously covered with an 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 a shield layer 5. As a method for establishing electrical continuity between the shield layer 5 and the drain wire 3 of the flat cable 1, a required portion 4 of the insulating resin film 4 interposed between the shield layer 5 and the drain wire 3
Conventionally, a method of peeling a and directly contacting each other has been used.

[0003]

However, 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 such as a flat cable 1 ′ shown in FIG. A method has also been proposed in which the portions 6, 6 are provided, and the connecting portions 6, 6 are pushed in to break through the insulating film 4 at the acute-angled portions 6a, 6a at the tips to make contact with the drain wire 3 (Japanese Patent Laid-Open No. 2000-23447). However, in both cases, the workability improvement is limited because the process of removing the insulating film is still required.

The present invention has been made in view of the above problems, and an object thereof is to provide a ground wire connecting structure to a flat cable with a shield layer, which can reduce the number of steps of connecting the ground wire to improve work. .

[0005]

In order to solve the above-mentioned problems, the present invention is directed to a surface of an insulating resin film which is attached to both surfaces of conductors which are arranged side by side with a conductive layer inside and an insulating resin outside. Consisting of a flat cable with a shield layer to which a shield layer consisting of layers is fixed, and a connection terminal in which a protrusion capable of piercing the shield layer is provided on the inner surface of the metal plate to which the ground wire is connected. The conductive layer is exposed to the outer surface by peeling off the part and folding back in two, and the inner surface of the metal plate of the connection terminal is brought into close contact with the exposed outer surface of the conductive layer and the projection is formed on the shield layer. A structure for connecting a ground wire to a flat cable with a shield layer, characterized in that the ground wire and the shield layer are connected by being pierced and fixed.

According to the above structure, since the metal plate of the connection terminal is in close contact with the conductive layer of the shield layer folded back,
The ground wire can be directly connected to the conductive layer via the connection terminal. In addition, since the protrusion protruding from the connection terminal pierces the shield layer, the connection terminal can be fixed at a required position on the shield layer, and the protrusion itself contacts the conductive layer, thereby connecting the connection terminal and the conductive layer. Can be made more reliable. Therefore, the ground wire can be connected to the shield layer by a simple operation as compared with the method of using the inner conductor as the drain wire by peeling off the insulating resin film and connecting the inner conductor to the conductive layer of the shield layer. .

The connection terminal is made of a metal plate of copper, tin-plated copper or brass, and the ground wire is made of a covered electric wire, a twisted metal wire, or a braided wire.
Then, one end of the ground wire is fixed to the metal plate by welding or soldering. Further, the protrusions provided on the metal plate are fixed by welding, soldering, or forming holes in the metal plate and press-fitting the protrusions. The shape of the protrusion is preferably a needle-like protrusion that is easy to pierce.

The shield layer is fixed to the outer surfaces of the insulating resin films on both sides which are attached to both surfaces of the conductor,
The connection terminals are attached so as to sandwich the shield layers on both sides, and the projections of the connection terminals are provided so as to face the shield layers on the upper and lower sides, and are also pierced on the upper and lower shield layers to connect with the conductive layers is doing. By doing so, the connection terminals will contact the conductive layers of the shield layers on both the upper and lower surfaces, which will further improve the connection reliability and will be easy to install simply by sandwiching the connection terminals between the flat cables with shield layers. You can Further, since the shield layers are arranged on the upper and lower surfaces, the electromagnetic shielding effect can be further enhanced.

Further, the connection terminal may be housed in a connector housing having a mounting portion capable of being clamped and fixed to the flat cable, and the connection terminal may be fixedly attached to the shield layer via the connector housing. Good. As a result, the workability and the mounting strength of the connection terminal on the flat cable can be further improved. Furthermore, on the inner surface of the connector housing,
By disposing an elastic sheet for preventing slippage at a portion in contact with the shield layer, it is possible to prevent positional displacement of the connector housing with respect to the shield layer.

[0010]

DETAILED DESCRIPTION OF THE INVENTION A first embodiment of the present invention will be described with reference to the drawings. 1 to 3 show a ground wire connection structure for a flat cable with a shield layer according to a first embodiment of the present invention, in which a ground wire is connected to a side portion of a flat cable 10 having a shield layer 15 via a connection terminal 20. 30 are connected. This flat cable 10 is used for a wire harness for automobiles, and four conductors 11 made of a thin copper plate having a width of 1.5 mm and a thickness of 0.1 mm are arranged in parallel at intervals, and both front and back surfaces are insulated. Resin film 14
And 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. .

As shown in FIG. 2, the connection terminal 20 includes a metal plate 21 made of copper, tin-plated copper, brass or the like having a length of 13 mm, a width of 1.5 mm and a thickness of 0.1 mm, and the metal plate 21. And two projections 22 vertically projecting from both ends in the length direction. The projection 22 has a triangular mountain shape or a needle-like sharpened shape so as to be able to pierce the shield layer 15, and has a projection height of about 1 mm. The projection 22 is formed by punching out the metal plate 21 from one direction, or is formed by penetrating another body and fixing it by welding, soldering, or the like. Further, a core wire 30a at the other end of the ground wire 30 whose one end is connected to the ground connection portion of the vehicle body or the like is fixed to the metal plate 21 of the connection terminal 20 by welding, soldering or the like. In addition to the resin-coated electric wire, a twisted metal wire, a braided metal wire, or the like may be used as the ground wire 30, and various terminals may be attached to the end portion of the attachment to the vehicle body.

To connect the connection terminals 20 to the flat cable 10, first, as shown in FIGS. 1 and 3, from the end of the flat cable 10 to the shield layers 1 on both upper and lower surfaces.
5 is peeled off over a width of about 5 mm and folded back in two folds to expose the conductive layer 16 on the surface. Then
The metal plate 21 of the connection terminal 20 is folded in two, and the flat cable 10 is attached so as to sandwich the folded back conductive layer 16 from above and below. As a result, the inner surface of the metal plate 21 is brought into close contact with the conductive layer 16, and the protrusion 22 protruding from the metal plate 21 is pierced and fixed in the shield layer 15, and the peripheral surface of the protrusion 22 also contacts the conductive layer 16. . Therefore, the ground wire 30 fixed to the metal plate 21
Is the conductive layer 16 of the shield layer 15 via the connection terminal 20.
As a result, the ground wire 30 can be easily taken out from the flat cable 10.

4 and 5 show a second embodiment of the present invention. In the second embodiment, the connection terminal 40 is housed in the connector housing 50 and attached to the flat cable 10. As in the first embodiment, the connection terminal 40 is provided with a protrusion 42 on the surface of a metal plate 41, but the metal plate 41 is used as a single plate without being folded in two. The connector housing 50 is composed of a pair of half-moon-shaped housing bodies 51, 52 that can be divided into upper and lower parts. The connection terminal 40 is fitted and fixed in a recess 51 a formed in the inner surface of one of the housing bodies 51. The fixed ground wire 30 is extended to the outside through the groove portion 51b extending from the recess 51a to one end of the housing body 51. The connector housing 50 is
Molded from a thermoplastic resin such as polyamide, polyester, or polyolefin, or an elastomer.

Further, a locking piece 53 having a locking claw 53a at the lower end is projected from both ends of the inner surface of the other housing main body 52, and the locking piece 5 is provided at a position opposite to the one housing main body 51.
3, a locking hole 54 capable of receiving 3 is formed. When the flat cable 10 is sandwiched between the upper and lower housing bodies 51 and 52, the locking piece 53 can be locked by the locking claw 53a at the lower end through the other housing body 52 and at the rim of the locking hole 54. It is set to a different length. An elastic sheet 60 made of a rubber sheet or an elastomer is attached to the inner surface of the housing bodies 51 and 52 at a portion that comes into contact with the shield layer 15 when the flat cable 10 is attached.

To connect the connection terminal 40 to the flat cable 10 using the connector housing 50, the first
As in the embodiment, the housing bodies 51 and 52 are attached to the shield layer 15 which is folded back to be sandwiched from above and below. As a result, the locking piece 53 protruding from the housing main body 52 is inserted into the locking hole 54 of the other housing main body 51 and locked and fixed. At the same time, the projection 42 of the connection terminal 40 fitted on the inner surface of the housing body 51 pierces the shield layer 15, and the metal plate 41 contacts the conductive layer 16 to connect the ground wire 30 from the shield layer 15 via the connection terminal 40. You can take it out. In this way, the ground wire 3 can be easily attached to the flat cable 10 by simply attaching the connector housing 50.
The connection terminal 40 connected to 0 can be fixed in contact with the shield layer 15. The housing bodies 51, 52
The interposition of the elastic sheet 60 attached to the inner surface of the connector also prevents the connector housing 50 from being displaced with respect to the flat cable 10.

In each of the above embodiments, the flat cable 10 is provided with the shield layers 15 on both the front and back surfaces, but the flat cable 10 may have only one surface.
Further, in the first embodiment, the example in which the connection terminal 20 is folded in two and sandwiched between the flat cables 10 from above and below is shown. However, as the connection terminals 20, a pair of single plates may be attached from above and below. May be. Furthermore,
In the second embodiment, the example in which the connection terminal 40 is fitted to only one of the housing main bodies 51 has been shown, but the connection terminals 40 may be provided in both of the housing main bodies 51 and 52.

[0017]

As is apparent from the above description, according to the present invention, it is only necessary to attach the connection terminal having the ground wire to the shield layer folded back in the flat cable so as to sandwich it from the outer surface. The projection provided on the connection terminal can be pierced and fixed in the shield layer, and at the same time, electrical contact can be obtained. Therefore, the ground wire connection to the flat cable with the shield layer can be performed by a simple operation without requiring troublesome work, and the workability can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a ground wire connection structure for a flat cable with a shield layer according to the present invention.

FIG. 2 is a perspective view of a connection terminal.

3 is a cross-sectional view of a main part of FIG.

FIG. 4 is an exploded perspective view of a connector housing used in the second embodiment.

FIG. 5 is a sectional view showing how the connector housing is attached to the flat cable.

FIG. 6 is a diagram showing a conventional example.

FIG. 7 is a diagram showing another conventional example.

[Explanation of symbols]

10 flat cable 11 conductors 14 Insulating resin film 15 Shield layer 16 Conductive layer 17 Insulating resin layer 20, 40 connection terminals 21 metal plate 22, 42 protrusion 30 ground wire 50 connector housing

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) H02G 15/02 H01R 9/07 B // H01R 107: 00 H02G 3/28 FF term (reference) 5E023 AA06 BB06 BB23 EE29 HH12 HH16 5E077 BB05 BB18 BB25 BB32 DD11 FF07 FF24 JJ16 5G355 AA08 BA04 BA12 5G363 AA09 BA05 DC02 5G375 AA11 AA12 CA03 CA13 CA19 CC07 DA08 DA36 DB11 DB16

Claims (4)

[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 a connection terminal in which a protrusion capable of piercing the shield layer is provided on the inner surface of the metal plate to which the ground wire is connected.The conductive layer is formed by peeling the end portion of the shield layer and folding it back in two. The layer is exposed to the outer surface, the inner surface of the metal plate of the connection terminal is brought into close contact with the outer surface of the exposed conductive layer, and the protrusion is pierced and fixed to the shield layer to connect the ground wire and the shield layer. A ground wire connection structure to a flat cable with a shield layer. 2. The shield layer is fixedly attached to the outer surfaces of insulating resin films on both sides which are attached to both sides of the conductor, and the connection terminals are attached so as to sandwich the shield layers on both sides. The earth wire connection structure for a flat cable with a shield layer according to claim 1, wherein the protrusion is provided so as to face the shield layers on both upper and lower sides, and is pierced into the upper and lower shield layers to be connected to the conductive layer. . 3. The connection terminal is internally provided in a connector housing having a mounting portion capable of being clamped and fixed to the flat cable, and the connection terminal is fixedly attached to the shield layer via the connector housing. Item 1
Alternatively, the ground wire connecting structure to the flat cable with a shield layer according to claim 2. 4. A ground wire connecting structure to a flat cable with a shield layer according to claim 3, wherein an elastic sheet for preventing slippage is interposed in a portion of the inner surface of the connector housing that comes into contact with the shield layer. .