JPH08255511A - Flexible flat cable - Google Patents

Abstract

PURPOSE: To provide a flexible flat cable having an excellent bending property. CONSTITUTION: In this flexible flat cable, plural conductors 220 are arrayed in parallel at intervals, insulating tapes 130a and 130b are stuck from both the surfaces of the conductors, and the conductors have flexible structure to bending. A conductor 210 can be any of a flat type metallic braid wherein a metallic fine wire is braided, or a straight angle wire made a flat type by rolling a stranded wire composed of the metallic fine wire.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a flat cable having a structure in which a plurality of wires are sandwiched by insulators,
Conventionally, it has been used for internal wiring of electronic devices and the like.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a flexible flat cable. The flat cable includes a plurality of flat conductors 120a, 120b, 120c, 120.
., c, 120e, .. are arranged in parallel at intervals, and insulating tapes 130a, 130b are adhered from both sides thereof. The insulating tapes 130a, 130 on both ends
The conductor exposed portions 140a and 140b are removed by removing the portion b in advance.
Is formed so that the work of exposing the conductor can be omitted when wiring in the electronic device.

FIG. 4 shows the flat cable AA '.
It shows a cross section. Flat conductors 120a, 120
b, 120c, .. are arranged at regular intervals, and the insulating tapes 130a, 130b are composed of base materials 132a, b and adhesives 134a, b, and are bonded together.

[0004]

Since the flat cable as described above is excellent in flexibility and occupies a small space, it has been conventionally used for internal wiring of electronic equipment such as video and printers, and especially for equipment. Contributes to miniaturization.

However, in recent years, there has been an increasing demand for making electronic devices having advanced functions more compact. The electronic parts tend to generate a large amount of heat when they are provided with advanced functions, and the environment in which the flat cable is used is becoming severe due to the radiant heat from the electronic parts and the like. Under such an environment, the bending characteristics are deteriorated due to deterioration of the plastic used as the insulating material of the flat cable.

Therefore, an object of the present invention is to provide a flexible flat cable having better flexibility.

[0007]

In order to solve the above-mentioned problems, the flexible flat cable according to the present invention comprises:
A flexible flat cable in which a plurality of conductors are arranged in parallel at intervals and insulating tapes are adhered from both surfaces thereof, is characterized in that the conductor has a flexible structure against bending.

Here, the conductor may be either a flat metal braid in which fine metal wires are woven or a flat wire obtained by rolling a stranded wire made of fine metal wires into a flat shape.

Further, the conductor may have a structure in which a plurality of flat rectangular conductors having the same shape are stacked as a set.

[0010]

According to the flexible flat cable of the present invention, since the plurality of conductors sandwiched by the insulating tapes have a flexible structure against bending, the flexibility is improved and the flexibility is improved. .

In particular, when the conductor is a flat wire obtained by rolling a metal braid or a stranded wire into a flat wire, the adhesive surface area with the adhesive of the insulating tape is increased to further increase the adhesive strength, resulting in higher reliability. Will be a big one.

[0012]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a flexible flat cable of the first embodiment. This flexible flat cable has a structure in which flat conductors 220 are arranged at regular intervals, and insulating tapes 130a and 130b are laminated so as to sandwich the flat conductor 220 in the vertical direction.

The insulating tapes 130a and 130b are made of PE.
Base material 1 made of plastic such as T, PEN, PPS
32a and 132b and adhesives 134a and 134b such as polyester-based or chlorinated resin-based adhesives. Conductor 22
For 0, a flat metal braid in which fine metal wires are woven is used, and copper, copper alloy with tin or silver, or the like can be used for the fine metal wires. This embodiment is characterized in this respect.

In this flexible flat cable, the metal braid is excellent in flexibility due to its mesh-like structure, and by using this for the conductor 220, the flexibility is further improved.
That is, a flexible flat cable having excellent flexibility can be obtained. Further, since the metal braid has irregularities on its surface, the adhesive surface area between the adhesives 134a and 134b of the insulating tapes 130a and 130b and the conductor 220 is increased, so that it is more bonded than a conventional flat conductor having a flat surface. The power becomes great. Further, because of the mesh-like structure of the metal braid, the conductor 220 is mechanically stretchable. Therefore, it becomes more reliable.

As described above, since the conductor has a flexible structure against bending, the flexible flat cable of the present invention has better bending property, improved flexibility, and is strong against bending fatigue. Without insulating tape 130a, 1
The adhesive strength of 30b is improved, and the reliability is further improved.

As the flat conductor 220, not only a metal braid but also a flat wire obtained by rolling a stranded wire made of a fine metal wire into a flat shape can be used. Flexibility can be similarly improved by using this rectangular wire.

FIG. 2 shows a flexible flat cable of the second embodiment. The flexible flat cable has a structure in which flat conductors 220 are arranged at a constant interval, and insulating tapes 130a and 130b are laminated so as to sandwich the flat conductor 220 in the vertical direction. Similar to the first embodiment, but each flat conductor 220 includes a plurality of thin flat conductors 220a and 220a.
It is characterized in that it has a structure in which b and 220c are combined as a set and are stacked. Flat conductors 220a, 220b, 22
0c has the same shape and a plate shape, and copper, a copper alloy with tin or silver, or the like can be used.

Since the flat conductor 220 has a flexible structure against such bending, the flat conductors 220a, 220b, 220c are bent differently when the flat cable is bent, so that flexibility is improved and resistance is improved. Flexing characteristics are improved.

In this embodiment, the rectangular conductors 220a, 22a
0b and 220c are all plate-shaped, but any one (or all) of the rectangular conductors 220a, 220b and 220c is flat-shaped by rolling a metal braid or a stranded wire as in the first embodiment. It is possible to use a rectangular wire. Thus, the rectangular conductors 220a, 220b, 220
By combining c, the advantages of the first embodiment can be obtained.

[0021]

As described above, according to the flexible flat cable of the present invention, the plurality of conductors sandwiched by the insulating tape have a flexible structure against bending, so that the flexibility is improved. Flexibility is improved. In particular, when the conductor is a flat metal wire obtained by rolling a metal braid or a stranded wire into a flat wire, the adhesive surface area of the insulating tape with the adhesive increases, resulting in a larger adhesive force and a higher reliability. It becomes a thing.

[Brief description of drawings]

FIG. 1 is a diagram showing a flexible flat cable of a first embodiment.

FIG. 2 is a diagram showing a flexible flat cable of a second embodiment.

FIG. 3 is a plan view of a conventional flexible flat cable.

FIG. 4 is a cross-sectional view of a conventional flexible flat cable.

[Explanation of symbols]

 130a, b Insulating tape 220 Conductor

Claims (3)

[Claims] 1. A flexible flat cable in which a plurality of conductors are arranged in parallel at intervals, and insulating tapes are adhered from both sides thereof, wherein the conductors have a flexible structure against bending. Flexible flat cable. 2. The flexible flat according to claim 1, wherein the conductor is a flat metal braid in which fine metal wires are woven or a flat wire obtained by rolling a stranded wire made of fine metal wires into a flat shape. cable. 3. The flexible flat cable according to claim 1, wherein the conductor has a structure in which a plurality of flat rectangular conductors having the same shape are stacked as a set.