JP5114119B2 - Flexible flat cable and manufacturing method thereof - Google Patents

Description

  The present invention relates to a shielded flexible flat cable and a method for manufacturing the same. More specifically, the present invention relates to a flexible flat cable having a simple configuration that does not require lamination of an external shield, and a manufacturing method capable of simplifying the manufacturing process.

  In a flexible flat cable (FFC), in order to prevent electromagnetic interference from the wiring material, the outer surface of the wiring material is covered with a conductor and an electromagnetic shield layer is provided. How to install this shield layer is an important technical issue.

3 to 6 are diagrams schematically showing an example of a conventional flexible flat cable. 3 and 4 are top views, FIG. 5A is a top view, FIG. 5B is a cross-sectional view, and FIG. 6 is a cross-sectional view.
In the production of the flexible flat cable, first, the rectangular conductors 100 are arranged at equal intervals to leave a conductor having a predetermined length, and then the insulating layers 101 are bonded to both surfaces of the rectangular conductor 100. Next, the reinforcing plate 102 is bonded to one side. Finally, a shield layer is bonded to the insulating layer 101 (see, for example, Patent Documents 1 and 2).

  At this time, in order to ground the shield layer, one of the rectangular conductors 100 is used as a grounding conductor 100a, and then the insulating layer 101 on the grounding conductor 100a is cut as shown in FIG. Method), a method in which the insulating layer 101 is not formed on the grounding conductor 100a (see FIG. 4, the second method), the grounding conductor 100a is composed of two flat conductors 100, and a lead portion (See FIG. 5, third method), etc. are known.

However, the conventional method has the following problems.
In the first method, when the insulating layer is cut and the grounding conductor and the shield layer are made conductive, the cutting of the insulating layer is a manual operation, so that the workability is poor and the cost is high.
In the second method, since an insulating layer is not formed on the grounding conductor, it is very difficult to manufacture due to problems such as conductor pitch and insulating wrinkles.

In the third method, it is difficult to manufacture two flat conductors along the grounding conductor and to align the two flat conductors without deviation when folded at the lead-out portion.
In any of the methods, as shown in FIG. 6, an external shield laminating process is required after the production of the flexible flat cable, which complicates the process and requires extra man-hours.
Japanese Patent Laid-Open No. 5-242736 JP-A-4-272617

The present invention has been devised in view of such a conventional situation, and a first object thereof is to provide a flexible flat cable having a simple configuration and excellent shielding properties.
The present invention also provides a method for producing a flexible flat cable, which can simplify the process and improve workability, and can produce a flexible flat cable excellent in shielding properties while reducing man-hours and costs. Second purpose.

  The flexible flat cable according to claim 1 of the present invention is an insulating conductor in which an insulating layer and an adhesive layer are sequentially stacked around the first flat rectangular conductor as viewed from the transverse cross-sectional direction. And a grounding conductor made of a second flat rectangular conductor, and an insulating tape formed by bonding a resin tape and a metal tape, and the insulating conductor and the grounding conductor are arranged at predetermined intervals in the width direction. Arranged and sandwiched and laminated in the thickness direction by the insulating tape with the metal tape side inside, and the longitudinal ends of the first rectangular conductor and the second rectangular conductor have a predetermined length of the insulating tape It is exposed to the outside of the tape.

  According to a second aspect of the present invention, there is provided a method for manufacturing a flexible flat cable, wherein an insulating layer and an adhesive layer are sequentially stacked around a first long rectangular conductor as viewed from the cross-sectional direction. A step of bonding a resin tape and a metal tape to form an insulating tape, and arranging the insulating conductor and a grounding conductor composed of a long second rectangular conductor in a line at a predetermined interval in the width direction. A step of laminating the insulating conductor and the grounding conductor with the insulating tape with the metal tape side inside, leaving a predetermined length at the longitudinal ends thereof, and the insulating conductor; and In the longitudinal direction end portion, at least the step of removing the insulating layer and the adhesive layer not sandwiched between the insulating tapes to expose the first flat conductor is provided.

  In the flexible flat cable of the present invention, a long insulating conductor and a long grounding conductor are arranged at predetermined intervals in the width direction, and are sandwiched from the thickness direction by the insulating tape. Laminated, the longitudinal ends of the first rectangular conductor and the second rectangular conductor have a configuration in which a predetermined length is exposed to the outside of the insulating tape. Thereby, it is possible to provide a flexible flat cable having a simple configuration and excellent shielding properties.

  Further, in the method for producing a flexible flat cable of the present invention, a long insulated conductor and a long grounding conductor are arranged at predetermined intervals in the width direction and sandwiched from the thickness direction by an insulating tape. By laminating, cable fabrication and external shield lamination can be done in one step. Also, post-processing (insulation layer incision, conductor folding, etc.) for obtaining conductor alignment and electrical connection between the grounding conductor and the external shield is not required. Thereby, in this invention, while simplifying a process and improving workability | operativity, the flexible flat cable excellent in shielding property can be manufactured, reducing a man-hour and cost.

  Hereinafter, an embodiment of a flexible flat cable according to the present invention will be described with reference to the drawings.

1A and 1B are diagrams schematically showing an embodiment of a flexible flat cable of the present invention, in which FIG. 1A is a top view and FIG. 1B is a cross-sectional view.
The flexible flat cable 1 of the present invention includes an insulating conductor 5 in which an insulating layer 3 and an adhesive layer 4 are sequentially stacked around the first flat rectangular conductor 2 as viewed from the transverse cross-sectional direction. A grounding conductor 7 composed of a second flat rectangular conductor 6 and an insulating tape 10 formed by bonding a resin tape 8 and a metal tape 9 together.
And the flexible flat cable 1 of the present invention has the insulating conductor 5 and the grounding conductor 7 arranged at predetermined intervals in the width direction, and the insulating tape 10 with the metal tape 9 side inside, The first flat rectangular conductor 2 and the second flat rectangular conductor 6 are laminated and sandwiched from the thickness direction, and a predetermined length is exposed to the outside of the insulating tape 10. .

  In the flexible flat cable 1 of the present invention, a long insulated conductor 5 and a long grounding conductor 7 are arranged at predetermined intervals in the width direction, and are sandwiched from the thickness direction by an insulating tape 10. The longitudinal ends of the first rectangular conductor 2 and the second rectangular conductor 6 have a configuration in which a predetermined length is exposed to the outside of the insulating tape 10. As a result, the flexible flat cable 1 has a simple configuration and excellent shielding properties.

Next, the manufacturing method of such a flexible flat cable 1 is demonstrated.
The method for producing a flexible flat cable according to the present invention is a process of forming an insulating conductor 5 by sequentially stacking an insulating layer 3 and an adhesive layer 4 around the long first flat rectangular conductor 2 as viewed from the cross-sectional direction. The step of bonding the resin tape 8 and the metal tape 9 to form the insulating tape 10, the insulating conductor 5 and the grounding conductor 7 made of the long second rectangular conductor 6 are spaced apart in the width direction by a predetermined distance. Laminated and sandwiched from the width direction by the insulating tape 10 with the metal tape 9 side inside, leaving a predetermined length at the longitudinal ends of the insulating conductor 5 and the grounding conductor 7. And a step of removing the portion of the insulating layer 3 and the adhesive layer 4 that are not sandwiched between the insulating tapes 10 at the longitudinal ends of the insulating conductor 5 to expose the first flat conductor 2. Having at least And features.

In the present invention, the insulated conductor 5 and the grounding conductor 7 are arranged side by side in the width direction at a predetermined interval, and laminated with the insulating tape 10 sandwiched from the thickness direction, thereby producing a cable and external shielding. Can be laminated in one step. Also, post-processing (insulation layer incision, conductor folding, etc.) for obtaining conductor alignment and continuity between the grounding conductor 7 and the external shield becomes unnecessary. Thereby, in this invention, while simplifying a process and improving workability | operativity, the flexible flat cable 1 excellent in shielding property can be manufactured, reducing a man-hour and cost.
Hereinafter, each step will be described.

(1) First, as shown in FIG. 2 (a), an insulating layer 3 and an adhesive layer 4 are sequentially stacked around the first flat rectangular conductor 2 as viewed from the cross-sectional direction. 5
A method for forming the insulating layer 3 and the adhesive layer 4 is not particularly limited, but a coating method by extrusion coating is desirable because of its high efficiency.

The material of the insulating layer 3 is not particularly limited, and examples thereof include insulating materials such as enamel, UV resin, and polyethylene resin.
Although it does not specifically limit as a material of the contact bonding layer 4, For example, the material with adhesive effects, such as a hot melt, an adhesive agent, and a solvent, is mentioned.

(2) Also, as shown in FIG. 2B, the resin tape 8 and the metal tape 9 are bonded together to form an insulating tape 10.
Although it does not specifically limit as a material of the resin tape 8, For example, a polyethylene terephthalate (PET) etc. are mentioned.
The material of the metal tape 9 is not particularly limited, and examples thereof include a metal material having a shielding effect such as copper and aluminum.

(3) Next, as shown in FIG. 2 (c), the insulated conductor 5 and the grounding conductor 7 composed of the elongated second flat conductor 6 are arranged side by side at a predetermined interval in the width direction, The insulating conductor 5 and the grounding conductor 7 are laminated so as to be sandwiched from the thickness direction by the insulating tape 10 with the metal tape 9 side inward, leaving a predetermined length at the longitudinal ends.
As the grounding conductor 7, a bare flat conductor (second flat conductor 6) that is not processed is prepared.

The insulating conductor 5 and the grounding conductor 7 are arranged, and after leaving a predetermined length at the end portion in the longitudinal direction of the conductor, the insulating tape 10 is bonded with the metal tape 9 inside.
In the laminating process, the insulated conductor 5 and the grounding conductor 7 are used as conductors, the grounding conductors 7 are arranged at predetermined positions, and the insulated conductor 5 is used for the other conductors. These grounded conductors 7 and insulated conductors 5 are sandwiched and laminated with insulating tape 10 with the metal surface inside.

2D and 2E are enlarged perspective views showing a portion surrounded by a dotted line α in FIG.
(4) Next, as shown in FIGS. 2 (d) and 2 (e), the insulating layer 3 and the adhesive layer 4 that are not sandwiched between the insulating tapes 10 at the ends in the longitudinal direction of the insulating conductor 5 are formed. It removes and the said 1st flat conductor 2 is exposed.
The insulating layer 3 and the adhesive layer 4 on the portion of the insulating conductor 5 not sandwiched between the insulating tapes 10 are removed by, for example, manual work to expose the first rectangular conductor 2.
Thereby, the flexible flat cable 1 as shown in FIG. 1 is produced.

  As described above, in the present invention, the long insulating conductors and the long grounding conductors are arranged side by side in the width direction at predetermined intervals, and laminated by sandwiching from the thickness direction with the insulating tape, Cable fabrication and external shield lamination can be done in one step. Also, post-processing (insulation layer incision, conductor folding, etc.) for obtaining conductor alignment and electrical connection between the grounding conductor and the external shield is not required. Thereby, in this invention, while simplifying a process and improving workability | operativity, the flexible flat cable excellent in shielding property can be manufactured, reducing a man-hour and cost.

  As mentioned above, although the flexible flat cable and its manufacturing method of this invention were demonstrated, this invention is not limited to this, It can change suitably.

  The present invention is widely applicable to flexible flat cables.

It is a figure which shows an example of the flexible flat cable which concerns on this invention. It is a figure which shows the manufacturing process of the flexible flat cable of FIG. It is a figure which shows an example of the conventional flexible flat cable. It is a figure which shows another example of the conventional flexible flat cable. It is a figure which shows another example of the conventional flexible flat cable. It is a figure which shows the manufacturing method of the conventional flexible flat cable which requires an external shield lamination process.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Flexible flat cable, 2 First flat conductor, 3 Insulating layer, 4 Adhesive layer, 5 Insulating conductor, 6 Second flat conductor, 7 Grounding conductor, 8 Resin tape, 9 Metal tape, 10 Insulating tape

Claims (2)

An insulating conductor in which an insulating layer and an adhesive layer are sequentially stacked on the periphery as viewed from the cross-sectional direction of the long first flat conductor,
A grounding conductor composed of an elongated second rectangular conductor; and
Insulating tape formed by bonding resin tape and metal tape,
The insulated conductor and the grounding conductor are arranged at predetermined intervals in the width direction, and are sandwiched and laminated from the thickness direction by the insulating tape with the metal tape side inside,
The flexible flat cable is characterized in that the longitudinal ends of the first flat conductor and the second flat conductor have a predetermined length exposed to the outside of the insulating tape. A process in which an insulating layer and an adhesive layer are sequentially stacked around the first cross-sectional direction of the elongated first flat conductor to form an insulating conductor;
The process of bonding resin tape and metal tape to make insulating tape,
The insulated conductor and a grounding conductor made of a long second rectangular conductor are arranged at predetermined intervals in the width direction thereof, and a predetermined length of a longitudinal end portion of the insulated conductor and the grounding conductor is set. Leaving and laminating from the thickness direction by the insulating tape with the metal tape side inside, and,
A flexible flat cable comprising at least a step of exposing the first flat conductor by removing a portion of the insulating layer and the adhesive layer that are not sandwiched by the insulating tape at an end portion in the longitudinal direction of the insulating conductor. Manufacturing method.

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