JP2003045241A - Shield flat cable and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield flat cable of narrow width and its manufacturing method. SOLUTION: The shield flat cable is constructed of a drain wire 25 and one or more insulating core wires 24 that are arranged in parallel on the same plane, a shield 26 made of shield metallic tapes 28, 29 that are formed by clipping the drain wire 25 and the one or more insulating core wires 24 from both front and rear direction crossing the above plane at right angles, and a sheath 27 as an insulating body that covers the shield 26. The shield 26 comprises a wire shield part 30 that covers the drain 25 and the one or more insulating core wires 24 respectively and a shield bridge part 31 that continues from the wire shield part 30 and connects the adjoining drain wire 25 and the one or more insulating core wires 24, and the shield bridge part 31 is arranged in bent state and makes the distance of the above adjoining wires narrow.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielded flat electric wire and a method of manufacturing the same, and more particularly, to a shielded flat electric wire having a shield formed so as to integrally cover a drain wire and one or more insulated wire cores and a method of manufacturing the same. Regarding

[0002]

2. Description of the Related Art A shield flat electric wire 1 as shown in FIG. 6 is generally known as a shield flat electric wire of this type. The shield flat electric wire 1 is
A plurality of insulated wire cores 4 in which the conductor 2 is covered with an insulator 3, a drain wire 5 made of only the conductor, a shield 6 integrally covering these, and a sheath 7 covered on the shield 6 are provided. It is configured.

Explaining each of the above structures in a little more detail, a plurality of insulating wire cores 4 and drain wires 5 are arranged in parallel on the same plane with a predetermined interval. Also,
The shield 6 includes a plurality of insulating wire cores 4 and a drain wire 5 from the front and back directions orthogonal to the above plane, and a shield metal tape 8,
It is formed so as to be sandwiched by 8 and has a line shield portion 9 and a shield bridge portion 10.

The wire shield portion 9 is formed so as to cover each of the plurality of insulating wire cores 4 and the drain wire 5.
Moreover, the shield bridge portion 10 is formed so as to be continuous with the wire shield portion 9 and to connect between the adjacent ones of the plurality of insulating wire cores 4 and the drain wires 5. The bridge portion 11 of the sheath 7 is formed on the shield bridge portion 10.

Incidentally, the shield bridge portion 10 is, for example,
The shield bridge portion 10 is formed with a width capable of ensuring a predetermined adhesive force so that peeling (opening) does not occur in the overlapping portion (if the peeling occurs in the overlapping portion, the shielding performance is improved. In addition, there is a possibility that the electrostatic capacitance formed by the conductor 2 and the shield 6 and kept constant may fluctuate to cause a reflection phenomenon. It shall coincide with the direction in which the core 4 and the drain wire 5 are arranged).

[0006]

In the above-mentioned prior art, however, the width of the shield bridge portion 10 cannot be reduced because it is necessary to secure a predetermined adhesive force. Therefore, there has been a problem that it is not possible to make a shielded flat electric wire having a narrow width that meets the needs for weight reduction and space saving that have been increasing in recent years. Further, as a result of the problem, there has been a problem that the pressure contact connector connected to the terminal cannot be reduced in weight and space.

In order to deal with these problems, it is considered that the width of the shield bridge portion 10 is narrowed by using a shielding metal tape having a high adhesive force. The strength also increased, and peeling processing during terminal processing became difficult, so it was not adopted.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a shielded flat electric wire having a narrow width and a method for manufacturing the same.

[0009]

A shield flat electric wire according to the present invention, which has been made to solve the above-mentioned problems, comprises a drain wire and one or a plurality of insulating cores arranged in parallel on the same plane. A shield comprising a shield metal tape formed by sandwiching the drain wire and one or more insulating wire cores from the front and back directions orthogonal to the plane, and an insulator covered on the shield, The shield includes a wire shield portion that covers each of the drain wire and the one or more insulating wire cores, and a shield bridge that connects the drain wire and one or more insulating wire cores that are adjacent to each other and that are continuous to the wire shield portion. And a desired shield bridge portion is bent and arranged so that a space between the adjacent ones is narrowed.

A method for manufacturing a shielded flat electric wire according to the present invention as set forth in claim 2 for solving the above-mentioned problems,
A step of arranging the drain wire and the one or more insulating wire cores in parallel on the same plane; and a metal for shielding from the front and back directions in which the drain wire and the one or more insulating wire cores arranged in parallel are orthogonal to the plane. A step of forming a shield sandwiched with tape, and a step of coating an insulator on the formed shield, in the step of forming the shield, each of the drain wire and one or a plurality of insulating wire cores And a shield bridge portion that connects the drain wire and one or more insulating cores that are adjacent to each other and that connects to the wire shield portion that covers the wire shield portion. Between the step of forming the shield and the step of covering the insulator, the desired shield bridge portion is bent and arranged, and the interval between the adjacent portions is narrowed. It is characterized by including that step.

According to the present invention described in claim 1,
The shield bridge portion forming the shield is bent and arranged between the corresponding wire shield portions. As a result, the line pitch is narrowed while securing the adhesive force of the shield bridge portion. Then, in this state, the shield is covered with the insulator, so that a shield flat electric wire having a narrow width is formed.

According to the invention described in claim 2,
After the step of forming the shield is performed, a step of bending and arranging a desired shield bridge portion and narrowing the interval between adjacent ones corresponding thereto is performed. After that, a step of covering the insulator is performed to manufacture the shield flat electric wire. In such a process, since the shield bridge portion is bent and arranged between the corresponding line shield portions, the line pitch is narrowed while the adhesive force of the shield bridge portion is secured. Then, in this state, the shield is covered with the insulator, so that the shield flat electric wire having a narrow width is manufactured.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the shield flat electric wire of the present invention, and FIGS. 2 to 5 are sectional views showing an embodiment of the method of manufacturing the shield flat electric wire of the present invention.

In FIG. 1, reference numeral 21 indicates a shield flat electric wire. The shielded flat electric wire 21 includes a plurality of known insulated wire cores 24 in which a conductor 22 is covered with an insulator 23, and a known drain wire 25 composed of only the conductor.
And a shield 26 that integrally covers the insulating wire core 24 and the drain wire 25, and a sheath 27 (corresponding to the insulator described in the claims) that covers the shield 26. There is. In addition, the shield flat electric wire 21
Is formed to be narrower in width than the conventional shield flat electric wire.

The shield 26 is formed using, for example, a pair of upper and lower shield metal tapes 28 and 29.
Only the drain wire 25 is electrically connected with the plurality of insulating wire cores 24 and the drain wire 25 being integrally covered. Further, the shield 26 is formed with a plurality of line shield portions 30 and a shield bridge portion 31 continuous with the line shield portions 30. That is, in FIG. 1, the wire shield portions 30 are formed so as to be in close contact with the outer surfaces of the insulator 23 and the drain wire 25 of each insulated wire core 24. Further, the leftmost insulated wire core 24 and the second insulated wire core 24 from the left in the figure, the second insulated wire core 24 from the left and the third insulated wire core 2 from the left.
4 and the third insulated wire core 24 and drain wire 2 from the left
5, the shield bridge portions 31 that are bonded to each other and connect between the adjacent portions are formed.

Here, each shield bridge portion 31 will be described in more detail. The shield bridge portions 31 of the present embodiment are not arranged straight along the width direction as in the conventional case, but are shown in FIG. It is arranged along the corresponding line shield portion 30. That is, from the upper right of the leftmost insulated wire core 24 to the lower left of the second insulated wire core 24, the second insulated wire core 2
4 from the upper right to the lower left of the third insulated wire core 24, from the upper right of the third insulated wire core 24 to the lower left of the drain wire 25, and corresponding lines in a state that they are also sandwiched between adjacent ones. It is arranged along the shield portion 30 in a meandering manner. In other words, it is bent or arranged non-parallel to the same plane described later. This makes it possible to narrow the line pitch while ensuring the adhesive force of each shield bridge portion 31. The bending state is not limited to this embodiment.

The metal shield tapes 28, 29 constituting the shield 26 are metal foils provided with an adhesive layer, and concretely include copper-coated aluminum polyester tapes for shield and the like. In addition to the pure metal foil such as copper foil, those having a reinforcing layer such as resin can be used as the metal foil.

The sheath 27 is formed of an insulating synthetic resin. The portion of the sheath 27 corresponding to each insulating wire core 24 is formed to have a circular cross section so as to have a uniform thickness.
Further, since the line pitch is narrowed as described above, it is formed in a state where there is no bridge portion as in the conventional case. On the other hand, the portion of the sheath 27 corresponding to the drain wire 25 is formed in a circular shape so that the outer diameter thereof substantially matches the diameter of the insulating wire core 24. That is, the sheath 2
When the end of the portion corresponding to each insulated wire core 24 of 7 is peeled off, the portion corresponding to the drain wire 25 is changed to each insulated wire core 2
It is formed so as to have the same diameter as 4. This allows
There is an advantage that all the pressure contact terminals of the pressure contact connector (not shown) can be of the same type.

As described above, even if a force due to bending is applied to the shield flat electric wire 21, since the adhesive force of each shield bridge portion 31 is secured, the shield flat wire 21 is separated (opened) at the overlapping portion of each shield bridge portion 31. Does not occur. Therefore, it is possible to provide the device having a narrower width than the conventional one in a state in which the shield performance is kept good and the occurrence of the reflection phenomenon is prevented. As a result, weight reduction and space saving can be achieved. In addition, it is possible to reduce the weight and space of an unillustrated pressure contact connector (connector) connected to the end of the shielded flat electric wire 21.

Next, a method of manufacturing the shield flat electric wire 21 will be described. The shield flat electric wire 21
Is manufactured by including the steps of arranging the insulating wire cores 24 and the drain wires 25, the step of forming the shield 26, the step of narrowing the interval, and the step of covering the sheath 27 (manufactured. The description is omitted because the winding process of the shield flat electric wire 21 is the same as the conventional one.

First, as shown in FIG. 2, a step of arranging each of the insulating cores 24 and the drain wire 25 is performed.
Then, when this step is performed, each insulating wire core 24 and drain wire 25 are arranged in parallel on the same plane with a line pitch P1. The virtual line L1 is assumed to be on the same plane. Further, a direction parallel to the virtual line L1 and in which the insulating cores 24 and the drain wires 25 are arranged is referred to as a width direction in this specification.

Next, as shown in FIG. 3, a step of forming the shield 26 is performed. In this step, the insulating wire cores 24 and the drain wires 25 are attached to the shield metal tape 2 from the front and back directions (see the direction of arrow A) orthogonal to the plane.
It is carried out by being sandwiched by 8 and 29. Then, when this step is performed, the wire shield portions 30 are formed on the outer surfaces of the insulator 23 and the drain wire 25 of each insulated wire core 24,
In addition, the leftmost insulation core 24 and the second insulation core 24 from the left, the second insulation core 24 from the left and the third insulation core 24 from the left, and the third insulation core from the left Between the insulated wire core 24 and the drain wire 25, the shield bridge portions 31 that are bonded to each other and connect between the adjacent wires are formed. That is, the shield 26 is formed.

Subsequently, as shown in FIG. 4, a step of narrowing the interval is performed. Then, when this step is performed, each insulated wire core 2 having a wire pitch of P1 (see FIG. 2) is
4 and the drain wire 25 are shrunk to the line pitch P2 (shrinked in the arrow B direction along the width direction, P1> P2).

Subsequently, as shown in FIG. 5, a step of covering the sheath 27 is performed. Then, when this step is performed, the narrow shield flat electric wire 21 is manufactured (the sheath 27 is extruded on the shield 26).

For comparison, the conventional shield flat electric wire 41 is shown by an imaginary line. The conventional shield flat electric wire 41 is manufactured to have a width W2 because the shield bridge portion (not shown) is arranged straight along the width direction and the bridge portion 42 is formed in the sheath. Therefore, if the width of the shielded flat electric wire 21 is W1, it is understood that the shielded flat electric wire 21 is manufactured to be sufficiently narrower than the conventional shielded flat electric wire 41 (W1 <W2).

By adopting the above manufacturing method,
The shielded flat electric wire 21 having a narrow width can be manufactured in a state where the adhesive force of the shield bridge portion 31 is secured.

In addition, it goes without saying that the present invention can be modified in various ways without departing from the spirit of the present invention. In the above description, a plurality of insulated wire cores 24 (three in the figure. Two,
Four, but it could be), but one is of course good. Further, although the line pitch P1 is made equal in the step of arranging each insulating wire core 24 and the drain wire 25, it is not limited to this. Further, although all the shield bridge portions 31 are bent to narrow the width, the present invention is not limited to this. That is, only some of the shield bridge portions 31 may be used.

[0028]

As described above, according to the present invention described in claim 1, it is possible to form a narrow shield flat electric wire in which the adhesive force of the shield bridge portion is secured. Further, this makes it possible to reduce the weight and space of the shielded flat electric wire. Further, it is possible to reduce the weight and space of the connector connected to the end of the shielded flat electric wire.

According to the present invention described in claim 2,
By adopting the manufacturing method of the present invention, it is possible to manufacture a narrow shield flat electric wire in which the adhesive strength of the shield bridge portion is secured. This makes it possible to reduce the weight and space of the shielded flat electric wire. Further, it is possible to reduce the weight and space of the connector connected to the end of the shielded flat electric wire.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a shield flat electric wire according to the present invention.

FIG. 2 is a cross-sectional view showing a step of disposing a drain wire and an insulating wire core in an embodiment of the method for manufacturing a shielded flat electric wire according to the present invention.

FIG. 3 is a cross-sectional view showing a step of forming a shield in the embodiment of the method for manufacturing the shielded flat electric wire according to the present invention.

FIG. 4 is a cross-sectional view showing a step of narrowing an interval in the embodiment of the method for manufacturing the shielded flat electric wire according to the present invention.

FIG. 5 is a cross-sectional view showing a step of coating an insulator in the embodiment of the method for producing a shielded flat electric wire according to the present invention.

FIG. 6 is a cross-sectional perspective view showing the structure of a shielded flat electric wire of a conventional example.

[Explanation of symbols]

21 Shield flat electric wire 22 conductor 23 Insulator 24 insulated wire core 25 drain wire 26 Shield 27 Sheath (insulator) 28, 29 Shielding metal tape 30 wire shield 31 Shield bridge

Claims (2)

[Claims] 1. A drain wire and one or a plurality of insulating wire cores arranged in parallel on the same plane, and the drain wire and one or a plurality of insulating wire cores sandwiched between the front and back directions orthogonal to the plane. A shield made of a metal tape for shielding, and an insulator coated on the shield, wherein the shield includes a wire shield portion covering each of the drain wire and one or more insulating wire cores, and the wire. A shield flat electric wire having a shield bridge part continuous to the shield part and connecting between the drain wire and one or more insulating wire cores adjacent to each other, wherein the desired shield bridge part is arranged by bending the adjacent parts. Shield flat electric wire characterized by narrowing the gap between each other. 2. A step of arranging a drain wire and one or a plurality of insulating wire cores in parallel on the same plane, and a front and back surface in which the drain wire and one or a plurality of insulating wire cores arranged in parallel are orthogonal to the plane. Including a step of sandwiching a shield with a shield metal tape from a direction, and a step of coating an insulator on the formed shield, in the step of forming the shield, the drain wire and one or a plurality of A shield flat electric wire configured to form a wire shield portion that covers each of the insulated wire cores, and a shield bridge portion that is continuous with the wire shield portion and that connects the drain wire and one or more adjacent insulated wire cores to each other. Between the step of forming the shield and the step of covering the insulator, the desired shield bridge portion is arranged by bending and is adjacent to the shield bridge portion. Method for manufacturing a shielded flat cable, characterized in that, including the step of narrowing the gap between.