JP2003045232A - Flat conductor and flat cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flat conductor and a flat cable using the same that has good bending characteristics. SOLUTION: The flat conductor 12 is constructed of copper or copper alloy and has a thickness of 0.020-0.035 mm and a width of 0.2-0.3 mm, and using this flat conductor as a main body 13, a thermoset resin film 14 of a thickness of 0.005-0.02 mm is formed around the main body 13. The flat cable using this flat conductor is made by forming a group of flat conductors 23 by arranging in parallel the plural conductors 12 at a prescribed pitch and providing an insulating body 34 at the outer circumference of the group of flat conductors 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat conductor and a flat cable using the flat conductor, and more particularly to a flat conductor having excellent bending characteristics and a flat cable using the flat conductor.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for downsizing and weight saving of electronic equipment and space saving of wiring space. It is becoming more popular, and flat cables are often used.

As shown in FIG. 3, the flat cable 31
Is a plurality of conductors 32 (four in FIG. 3) arranged in parallel at a predetermined pitch to form a conductor group 33, and an insulator 34 is provided on the outer periphery of the conductor group 33. The insulator 34 includes, for example, insulator films 36a and 36b having an adhesive layer 35 on one surface thereof, the conductor group 33 being sandwiched with the adhesive layer 35 inside, and the insulator films 36a and 3b.
It is formed by heating 6b to fuse the adhesive layer 35. The conductor 32 is an annealed material (tensile strength of 20) of Sn (or solder) plated tough pitch copper (or oxygen free copper).
0 MPa or more, elongation 20% or more, conductivity 100% IAC
S) and a copper alloy made of a rectangular conductor (Japanese Utility Model Laid-Open No. 63-61703, JP-A-11-11107).
No.

By using this flat cable, the cables are not bundled and the wiring space can be saved. In addition, the mounting density can be improved and the risk of incorrect wiring is reduced, which facilitates maintenance and inspection. Further, since the flexibility is good, the wiring work is easy.

[0005]

However, in recent years,
The demand for miniaturization of electronic devices is further increasing, and in flat cables, there are increasing demands for narrower pitch, higher density, and higher bending characteristics. In particular, the bending characteristic is one of the important characteristics in the flat cable because it is the performance that affects the reliability of the product.

An object of the present invention, which was devised in consideration of the above circumstances, is to provide a flat conductor having good bending characteristics and a flat cable using the flat conductor.

[0007]

In order to achieve the above object, a rectangular conductor according to the present invention is made of copper or a copper alloy and has a thickness of 0.020 to 0.035 mm and a width of 0.2 to 0. 3m
In the m rectangular conductor, the rectangular conductor is used as a main body, and a thermosetting resin coating having a film thickness of 0.005 to 0.02 mm is formed around the main body.

With the above structure, the breaking strength and elongation of the rectangular conductor are better than those of the main body alone.

On the other hand, the flat cable using the flat conductor according to the present invention has a thickness of 0.020 to 0.035 mm,
A plurality of rectangular conductors formed by forming a thermosetting resin coating with a film thickness of 0.005 to 0.02 mm around a rectangular conductor body having a width of 0.2 to 0.3 mm in parallel at a predetermined pitch. A rectangular conductor group is formed by arranging the conductors, and an insulator is provided on the outer periphery of the rectangular conductor group.

According to the above construction, a flat cable having good bending characteristics can be obtained by forming the flat cable by using the rectangular conductor having good breaking strength and elongation.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of the flat conductor according to the first embodiment, and FIG. 2 is a sectional view of a flat cable using the flat conductor according to the first embodiment. Incidentally, FIG.
The same members are designated by the same reference numerals.

As shown in FIG. 1, the rectangular conductor 12 according to the present embodiment is formed by forming a thermosetting resin coating film 14 around a rectangular conductor body 13 made of copper or a copper alloy. Is. Here, the size of the rectangular conductor main body 13 is
The thickness is 0.020 to 0.035 mm and the width is 0.2 to 0.
The thickness of the thermosetting resin coating film 14 is 3 mm.
5 to 0.02 mm, preferably 0.01 to 0.0175
mm, particularly preferably about half the thickness of the body 13.

Examples of the resin forming the thermosetting resin coating film 14 include polyurethane and polyester. Here, the method for forming the coating film 14 is not particularly limited, and any conventional method can be applied.

In the flat conductor 12 according to the present embodiment, the flat conductor 1 having only one thermosetting resin coating 14 is provided.
Although the description has been given with reference to the second example, it goes without saying that a plurality of layers of the coating film 14 may be formed around the main body portion 13.

On the other hand, as shown in FIG. 2, the flat cable 21 using the flat conductor according to the present embodiment has a plurality of the flat conductors 12 described above in parallel at a predetermined pitch (see FIG. 2).
(Four of them are shown in the drawing) are arranged to form a rectangular conductor group 23,
An insulator 34 is provided on the outer periphery of the rectangular conductor group 23. The insulator 34 has, for example, an adhesive layer 35 on one surface.
The insulating films 36a and 36b having
It is formed by sandwiching the conductor group 23 with 5 as the inside and heating the insulating films 36a and 36b to fuse the adhesive layer 35.

The conductor pitch of the rectangular conductors 12 in the rectangular conductor group 23 is preferably 0.3 to 0.5 mm.

As the insulator films 36a and 36b, a PET or polyester film is used as the adhesive layer 3
Examples of the adhesive constituting 5 include a resin having polyester or polyethylene as a base polymer.

Next, the operation of this embodiment will be described.

Since the rectangular conductor 12 in the present embodiment has the thermosetting resin coating 14 formed around the rectangular conductor body 13, the rectangular conductor 12 using the body 13 alone (see, for example, FIG. 3). The breaking strength (breaking load) and elongation of the rectangular conductor itself are improved as compared with the illustrated rectangular conductor 32).

As a result, the flat cable 21 using the flat conductor 12 is less likely to be cracked on the surface of the main body portion 13 of the flat conductor 12 when bent, and the flat cable 21 is subjected to repeated flexing. (Characteristics) are remarkably improved.

Further, according to the present embodiment, since the flat cable 21 has good bending characteristics, the thickness of the rectangular conductor should be thinner than that of the conventional flat cable (see FIG. 3). As a result, the flat cable can be made thinner.

Furthermore, conductive metal powder or the like may be added to the resin forming the thermosetting resin coating 14 of the rectangular conductor 12 to make the coating 14 conductive. This further improves the terminal connectivity when the flat cable 21 is connected to the terminal, and facilitates the wiring work.

The flat conductor wire 12 according to the present embodiment is not limited to being applied only to a flat cable, but can be applied to any cable as long as it is a cable used for bending.

[0025]

Example 1 Thermosetting resin having a thickness of 0.01 mm and made of polyurethane around a rectangular conductor body having a width of 0.3 mm and a thickness of 0.02 mm made of a soft material of tough pitch copper. A resin coating is formed to produce a rectangular conductor having the structure shown in FIG.

This flat conductor is provided with a conductor pitch of 0.3 mm.
Then, ten parallel conductors are arranged in parallel to form a rectangular conductor group. Next, a PET film having an adhesive layer of a resin using polyester as a base polymer is sandwiched between the rectangular conductor groups with the adhesive layer inside, and the PET film is heated,
The adhesive layer was fused to form an insulator, and a flat cable having the structure shown in FIG. 2 was produced.

(Conventional Example 1) The structure shown in FIG. 3 was obtained in the same manner as in Example 1 except that a flat rectangular conductor having a width of 0.3 mm and a thickness of 0.02 mm made of Sn-plated tough pitch copper alone was used. A flat cable was produced.

A U-shaped bending test and a left-right 90 ° bending test were performed on each flat cable to evaluate the bending resistance.

The U-shaped bending test was conducted according to JIS C 5016. Specifically, each flat cable was attached between the sliding rod of the tester and the sample fixing frame, and the bending radius was 5 m.
m, sliding stroke set to 25 mm, 1500 rp
While reciprocating at m, the flat conductor of each flat cable and the power source are connected in series to conduct electricity, and the current is 10 ^-6.
Measure the number of bends before the break for more than one second.

In the left-right 90 ° bending test, the load applied to each flat cable is 0.98 N (0.1 kgf),
Set the bending r of each flat cable to 0.5 mm,
Left and right 90 ° bending was performed at 30 cycles / min.

Comparing the evaluation results of each test, Example 1
The bending property of the flat cable in Example 1 was 10 times or more the bending property of the flat cable in Conventional Example 1, and it was confirmed that the flat cable had good bending property.

It is needless to say that the embodiments of the present invention are not limited to the above-mentioned embodiments but various other embodiments are possible.

[0033]

In summary, according to the present invention, a flat cable having good bending characteristics is obtained by forming a flat cable using a rectangular conductor having a thermosetting resin coating formed around the rectangular conductor body. It has the excellent effect of being able to.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a rectangular conductor according to a first embodiment.

FIG. 2 is a cross-sectional view of a flat cable using the flat conductor according to the first embodiment.

FIG. 3 is a sectional view of a flat cable using a conventional rectangular conductor.

[Explanation of symbols]

12 Flat conductor 13 Flat conductor body (body) 14 Thermosetting resin coating 21 flat cable 23 Flat conductor group 34 Insulator 35 Adhesive layer 36a, 36b Insulator film

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Takaro Ichikawa             Hitachi, 1-1 Hidaka-cho, Hitachi City, Ibaraki Prefecture             Electric Cable Co., Ltd. F-term (reference) 5G307 CA04 CB02                 5G311 CA01 CB01 CB02 CD03

Claims (3)

[Claims] 1. A copper or copper alloy having a thickness of 0.0
In a rectangular conductor having a width of 20 to 0.035 mm and a width of 0.2 to 0.3 mm, the rectangular conductor serves as a main body, and a thermosetting resin film having a film thickness of 0.005 to 0.02 mm around the main body. A rectangular conductor characterized by being formed. 2. The rectangular conductor according to claim 1, wherein the resin constituting the thermosetting resin film is a thermosetting resin to which conductive metal powder is added. 3. A flat conductor group is formed by arranging a plurality of flat conductors according to claim 1 in parallel at a predetermined pitch to form a flat conductor group, and an insulator is provided on the outer periphery of the flat conductor group. A flat cable that uses a rectangular conductor.