JP2003022714A - Flat cable with shield provided with earth connecting part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate an earth connecting work of a flat cable with a shield. SOLUTION: A drain material 12 composed of an electroconductive material at which conductors and minute needle-like protrusions 13 are installed taking distances in parallel, both faces of the drain material 12 are laminated by insulating resin films 14 together with the conductors, the needle-like protrusions 13 break through the insulating resin films 14 being laminated and are protruded outward, these protruded needle-like protrusions 13 are made into contact with electrically conducting layer 17 for the shield adhered and fixed to the surface of the insulating resin films 14, and the drain materials 12 are made to be protruded outward from the end of the insulating resin films 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shielded flat cable having a ground connection, and more specifically,
It improves the workability of the ground connection processing of the shielded flat cable.

[0002]

2. Description of the Related Art With the recent high-speed digital processing, flat cables for connecting electronic devices such as computers or inside electronic devices are required to be shielded from noise due to electromagnetic waves. A flat cable with a shield covering a layer (shield layer) is used. This kind of shielded flat cable
Like a flat cable 1 shown in FIG. 6, a plurality of conductors 2 and drain wires 3 are arranged in a plane in parallel, and both front and back surfaces of these conductors 2 and drain wires 3 are 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 the shield layer 5. As a method for establishing continuity between the shield layer 5 of the flat cable 1 and the drain wire 3, the shield layer 5
A conventional method has heretofore been used in which the required portion 4a of the insulating resin film 4 interposed between the drain line 3 and the drain line 3 is peeled off to directly contact each other.

[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 connecting portion by a slit such as a triangular shape that can be pushed into the shield layer 5 as in the flat cable 1 ′ shown in FIG. A method has also been proposed in which 6, 6 are provided, and the connecting portions 6, 6 are pushed in to break through the insulating resin film 4 at the acute-angled portions 6a, 6a at the tips to make contact with the drain wire 3 (JP 2001-23447 A). ), All of them still require a process of removing the insulating resin film, and thus there is a limit to improvement in workability.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a shielded flat cable having a grounding connection, which can reduce the number of steps of grounding connection and improve workability.

[0005]

In order to solve the above problems, the present invention provides a shield conductive layer made of a metal foil on the surface of an insulating resin film laminated on both surfaces of conductors arranged in parallel at intervals. A fixed shielded flat cable, in which a drain material made of a conductive material provided with minute needle-like protrusions is arranged in parallel with the conductors arranged side by side, and the drain material is formed on both sides of the insulating resin film together with the conductor. A shield for sticking the needle-like protrusions of the conductive material to the surface of the insulating resin film by sticking the needle-like protrusions of the conductive material through the insulating resin film to be laminated and protruding outward. A seal provided with a ground connection portion, which is in contact with a conductive layer and wherein the drain material is projected outward from an end portion of the insulating resin film. It has proposed a flat cable attached.

In the flat cable having the above-mentioned structure, the needle-like projections formed on the drain material cover the surface of the insulating resin film and simultaneously pierce the insulating resin film to project outward and are fixed to the outside thereof. The drain material and the conductive layer for shielding can be electrically conductive by directly contacting the conductive layer for shielding. Therefore, the work of confirming the peeling position of the insulating resin film and the troublesome peeling work itself are unnecessary, and the number of steps is reduced, so that the workability can be greatly improved.

The drain material is a foil made of a metal or a metal compound, a metal plate or a metal wire, and the minute needle-like protrusions are formed by piercing a drain material with a pin or by spraying a metal material. Use the one that you made. Alternatively, the needle-like protrusion may be formed by making a hole in the drain material and folding it back from the hole in a direction perpendicular to the required dimension.

The conductive layer for shielding is fixed to the outer surfaces of the insulating resin films on both sides which are laminated on both sides of the conductor and the drain material, and the needle-like protrusions of the drain material project on both sides to form insulating resin films on both sides. It may break through and be brought into contact with the conductive layers for shielding on both sides. Also, stick the conductive layer for shielding to only one side of the flat cable,
Needless to say, the needle-like protrusions of the drain material may be formed on only one surface of the shield conductive layer on the fixed surface side.

A pair of the drain materials may be arranged on both sides of a conductor made of metal foil arranged in parallel. Thereby, the electromagnetic wave shielding effect can be further enhanced.

It is preferable that the conductor and the drain material are projected in parallel from one outer end of the insulating resin film and the shield conductive layer and connected to an FFC connector (flexible flat cable connector). This F
By connecting the drain wire in the FC connector to a circuit for ground connection, the shield conductive layer of the flat cable can be easily grounded.

[0011]

DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a flat cable 10 with a shield according to a first embodiment of the present invention,
This flat cable 10 has two conductors 11 made of a metal foil and two drain materials 12 made of a metal plate, and a pair of drain materials 12 are arranged on both sides of the two conductors 11 so as to be spaced apart from each other. It has a structure in which the shield conductive layers 17 made of metal foils 16 are fixed to the outer surfaces of the insulating resin films 14 on both sides, after being laminated in parallel with each other and continuously laminating both sides of the insulating resin films 14. The tip ends of the conductor 11 and the drain material 12 are made to project in parallel from the insulating resin film 14 and one outer end of the shield conductive layer 17.

As shown in FIG. 2, the drain material 12 is formed by vertically piercing both front and back surfaces with a pin 13 made of a conductive material having pointed portions 13a at both upper and lower ends, and projecting needle-like protrusions on both front and back surfaces. There is.

When the shielded flat cable 10 using the drain material 12 is formed, as shown in FIG. 3 (A), when the drain material 12 is laminated with the conductor 11 on both sides of the insulating resin film 14, The pin 13 of the drain material 12 penetrates the insulating resin film 14 and projects outward on both front and back sides. By fixing the metal foil 16 for shielding to the front and back sides with the adhesive material 15 there, the metal foil 16 and the pin 13 can be directly contacted, as shown in FIG. 3 (B). Next, the drain material 12 and the tip of the conductor 11 protruding from the insulating resin film 14 and the shielding conductive layer 17 are used as terminals 18, and the terminals 18 are connected to the FFC connector 19 as shown in FIG.
The fork-shaped tab 19a locked inside is inserted and connected for ground connection.

With the above structure, the drain material 1
2 and the shield conductive layer 17 are the insulating resin film 14
Since it is possible to conduct electricity through the pin 13 at the same time as the laminating work, the labor and process of partially peeling off the insulating resin film 14 interposed therebetween as in the conventional case is unnecessary, and the flat cable with shield can be formed. Workability can be improved. Further, in the shielded flat cable 10, a pair of drain materials 12 are arranged on both sides so as to sandwich the conductor 11, and the shield conductive layer 1 is provided.
Since 7 is fixed on both the front and back surfaces, the electromagnetic wave shielding effect is enhanced, and the conductive portions between the drain material 12 and the shield conductive layer 17 are increased, so that a high shielding effect can be maintained.

FIGS. 5A and 5B show a shielded flat cable 20 according to the second embodiment of the present invention. As shown in FIG. 5 (A), the flat cable 20 has two conductors 21 made of a metal foil and one drain material 22 made of a metal compound foil so that the drain material 22 is located at an end. Are arranged in parallel with each other with a space therebetween, and both front and back surfaces thereof are continuously laminated with an insulating resin film 24. Then, a conductive conductive layer 27 for shielding made of a metal foil 26 is adhered to only one surface of the insulating resin film 24 with an adhesive material 25. It consists of a fixed structure. As shown in FIG. 5B, the drain material 22 has a plurality of needle-like protrusions 23 formed vertically on the outside by spraying a conductive metal material on only one surface thereof.

Also in this embodiment, at the same time when the insulating resin film 24 is laminated, the needle-like projections 23 of the drain material 22 penetrate the insulating resin film 24 and project outward on one side, so that the needle-like projections 23 project. By fixing the metal foil 26 to the above surface from above, the needle-like protrusions 23 and the metal foil 26 are in direct contact with each other, and the drain material 22 and the conductive layer 27 for shielding can be electrically connected.

[0017]

As is apparent from the above description, according to the present invention, by forming needle-like protrusions vertically on the surface of the drain material used for the flat cable, the drain material and the conductor are insulated from each other. At the same time as laminating with a film, the needle-shaped protrusions can pierce the insulating resin film and protrude outward, and can be in direct contact with the metal foil for shielding fixed thereto. Therefore, the drain material and the conductive layer for shielding can be easily conducted without the need for laborious peeling work of the insulating resin film and confirmation of the peeling position. The number of steps can be reduced and workability can be improved.

[Brief description of drawings]

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

FIG. 2 is a partially enlarged perspective view of the drain material shown in FIG.

3A and 3B are partially enlarged front views showing a method for forming the flat cable shown in FIG.

FIG. 4 is a cross-sectional view of essential parts showing a state in which the flat cable shown in FIG. 1 is grounded to an FFC connector.

FIG. 5 shows a flat cable according to a second embodiment of the present invention, (A) is a perspective view, and (B) is an enlarged front view of a main part.

FIG. 6 is a diagram showing a conventional example.

FIG. 7 is a diagram showing another conventional example.

[Explanation of symbols]

10, 20 shielded flat cable 11, 21 conductor 12, 22 Drain material 13 pin 23 Needles 14, 24 Insulating resin film 16,26 Metal foil 17, 27 Conductive layer for shield

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Claims (5)

[Claims] 1. A flat cable with a shield in which a conductive layer for shielding made of a metal foil is fixed to the surface of an insulating resin film laminated on both surfaces of conductors arranged in parallel with each other, which are minute needle-shaped. A drain material made of a conductive material provided with protrusions is arranged in parallel with the conductors arranged in parallel, the drain material is laminated with the conductor on both sides with the insulating resin film, and needle-like protrusions of the conductive material are laminated. The insulating resin film is pierced and projected outward, and the projected needle-like projection is brought into contact with a conductive layer for shielding that is fixed to the surface of the insulating resin film, and the drain material is the insulating resin film. A shielded flat cable with a ground connection, characterized in that it projects outward from the end of the. 2. The drain material comprises a foil made of a metal or a metal compound, a metal plate or a metal wire, and the minute needle-like protrusions are formed by piercing a drain material with a pin, or the metal material is thermally sprayed. A shielded flat cable having a ground connection according to claim 1, wherein the flat cable has a ground connection. 3. The conductive layer for shielding is fixed to the outer surface of the insulating resin film on both sides laminated on both sides of the conductor and the drain material, and the needle-like projections of the drain material project on both sides to insulate the resin on both sides. Break through the film,
A shielded flat cable comprising the ground connecting part according to claim 1 or 2, which is in contact with the conductive layers for shielding on both sides. 4. A shielded flat cable having a ground connection according to claim 1, wherein a pair of the drain members are arranged on both sides of a conductor made of metal foil arranged in parallel. . 5. The structure according to claim 1, wherein the conductor and the drain material project in parallel from one outer end of the insulating resin film and the shield conductive layer and are connected to the FFC connector. Flat cable with shield as described.