JP2001127426A - Connection method and connection structure for circuit conductors of flat conductor wiring board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection method and a connection structure of a circuit conductor of a flat conductor wiring board which can be metal-bonded, have excellent connection reliability, and can easily perform connection work. SOLUTION: Flat conductor wiring boards 20, 3 are provided at positions where desired connection regions in circuit conductors 21, 31 overlap each other.
0 are superimposed to penetrate the circuit conductors 21 and 31 in which the linear connection members 11 are superposed in the connection area, and both ends of the connection members 11 are formed along the surfaces of the flat conductor wiring boards 20 and 30. Bend in the same direction and bend 11a, 11
b, the two bent portions 11 of the connecting member 11
a, 11b are heated and pressurized to extrude the softened or melted insulating material 28a, 38a interposed in the connection area to the adjacent area, while bending each of the bent parts 11a, 11b.
And the circuit conductors 21 and 31 and the circuit conductors 21 and 31 are brought into direct contact with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and a structure for connecting circuit conductors of a flat conductor wiring board mounted on a vehicle body or an electric device.

[0002]

2. Description of the Related Art In recent years, as vehicles and electric equipment have become more sophisticated, circuits for controlling them have become more complicated, and it has become necessary to provide more wiring in a vehicle body and electric equipment. .
For this reason, a so-called FPC (flexible) in which a circuit conductor made of copper foil or the like is covered with an insulating material such as a thin insulating film.
le printed circuit), FFC (f
Since flat conductor wiring boards such as flexible flat cables have a very thin shape, they are suitable for arranging in the width direction in a narrow space portion and performing complicated wiring, and thus have been widely used. ing.

When circuit conductors of two flat conductor wiring boards are connected to each other, the covering of the insulating material in a desired connection region of each of the flat conductor wiring boards is peeled off to expose the circuit conductors. After soldering the circuit conductors to each other to electrically connect the circuit conductors (conventional example 1), or overlapping the flat conductor wiring boards so that the desired connection regions of the circuit conductors overlap with each other, the metal pins (Prior Art 2).

[0004]

However, in the case of the connection method of the prior art 1 described above, the work of exposing the circuit conductor by peeling off the coating of the insulating material in the desired connection area is cumbersome and troublesome. However, the workability is poor and the work time is prolonged.

[0005] In the case of the connection method of the above-mentioned conventional example 2, there is a problem that a sufficient contact area cannot be secured, contact resistance increases, and connection reliability decreases.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and is capable of performing metal connection, excellent connection reliability, and easy connection work. It is an object to provide a connection method and a connection structure.

[0007]

A connecting method according to the present invention is to electrically connect circuit conductors of a plurality of flat conductor wiring boards each having a circuit conductor covered with an insulating material. A first step of superposing a plurality of flat conductor wiring boards at positions where desired connection regions in the circuit conductor overlap with each other, and penetrating the circuit conductor in which the linear connection members are superposed in the connection region; A second step in which both ends of the member are bent in the same direction along the surface of each flat-type conductor wiring board to form a bent portion; A third step of directly contacting each bent portion with the circuit conductor and the circuit conductor in the connection region while extruding the softened or molten insulating material interposed between the bent portion and the circuit conductor and the circuit conductor into another region. I do.

According to this method, a plurality of flat conductor wiring boards are overlapped with each other at a position where desired connection areas of the circuit conductors overlap with each other without peeling off an insulating material covering the plurality of circuit conductors. By penetrating the circuit conductor in which the connecting members of the filaments are overlapped in the connection area,
The circuit conductor and the connecting member are brought into contact with each other at the penetrating portion to conduct. Then, after bending both ends of the connection member in the same direction along the surface of each flat conductor wiring board to form a bent portion, heating and pressing both the bent portions of the connection member are performed. , Each bent portion and the circuit conductor and the insulating material interposed between the circuit conductors become high temperature and are softened or melted and extruded into other regions, and the respective bent portions and the circuit conductors and the circuit conductors directly contact each other in the connection region. I do. For this reason, a sufficient contact area can be ensured, and the connection reliability is excellent. Moreover, there is no need to peel off the insulating material covering the circuit conductor, and the connection operation can be reliably performed in a short time.

A connection structure according to the present invention is a circuit conductor of a flat conductor wiring board for electrically connecting circuit conductors of a plurality of flat conductor wiring boards each having a circuit conductor covered with an insulating material. A plurality of flat conductor wiring boards superposed at positions where desired connection regions in the circuit conductor overlap with each other, a linear connection member penetrates the circuit conductor overlapped in the connection region, and the connection member Are formed in the same direction along the surface of each flat conductor wiring board at both ends of the flat conductor wiring board. , And the bent portions are in direct contact with the circuit conductors and the circuit conductors.

According to this connection structure, since each bent portion and the circuit conductor and the circuit conductor are in direct contact with each other, a sufficient contact area can be ensured and the connection reliability is excellent.

In the connection method of the present invention described above, when the connection member is coated with a low melting point metal,
In the third step, the low-melting-point metal coated on the connection member is heated and melted by energization, and then solidifies at the bonding interface with the circuit conductor. Therefore, the bonding becomes stronger due to metal bonding, and the contact resistance is further increased. Since it is reduced, the connection reliability can be further improved.

Further, the connecting member is made of copper, copper alloy, iron, carbon steel, stainless steel or alloy steel.

When the connecting member is made of copper or a copper alloy, the electric resistance of the copper and the copper alloy is small, so that the circuit resistance at the connecting portion can be reduced.

Further, when the connecting member is made of iron, carbon steel, stainless steel or alloy steel, since these materials have high mechanical strength, the connecting member of the filament passes through the flat conductor wiring board. The connection work can be performed more reliably without buckling at the time of the connection.

[0015]

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

A method and a structure for connecting circuit conductors of a flat conductor wiring board according to the present invention are described in which a plurality of flat conductor wiring boards each having a circuit conductor covered with an insulating material are superposed on each other, and Are electrically connected to each other using a linear connecting member.

FIGS. 1 to 3 specifically show an example of a connection method and a connection structure of circuit conductors of the flat conductor wiring board.

First, as a first step, as shown in FIGS. 2A and 2B, a plurality of parallel circuit conductors 21 to 27 shown in FIG. And a plurality of parallel circuit conductors 31
And the flat conductor wiring boards 20 and 30 in which the desired connection regions in the circuit conductors 21 to 27 and 31 to 37 overlap with each other. In addition, as shown in FIG.
The circuit conductors 21, 3 in which the linear connecting members 11 are overlapped in the connecting region without peeling the insulating materials 28, 38
1 through. As a result, the circuit conductors 21 and 31 and the connection member 11 come into contact with each other at the penetrating portion 11c to conduct electricity. Here, the width dimension of the linear connecting member 11 is
1 is narrower.

Next, as a second step, as shown in FIG. 2C, both ends of the connecting member 11 penetrating the flat conductor wiring boards 20 and 30 are brought into contact with the surface of each of the flat conductor wiring boards 20 and 30. To form the bent portions 11a and 11b.

Next, as a third step, as shown in FIGS. 1B and 2D, both bent portions 11a sandwiching a plurality of circuit conductors 21 and 31 via insulating materials 28 and 38, 11b
Is heated by resistance welding heads 41, 42 and the like and pressurized in the direction of the arrow shown in the figure, between the bent portion 11a and the circuit conductor 21, between the bent portion 11b and the circuit conductor 31, and between the bent portion 11b and the circuit conductor 31 and the circuit conductor 2
While extruding the softened or melted insulating materials 28a and 38a interposed between the first and the circuit conductors 31 into the adjacent region, as shown in FIG.
And the circuit conductor 21, the bent portion 11b and the circuit conductor 31, and the circuit conductor 21 and the circuit conductor 31 are brought into direct contact with each other.

According to the above connection method and connection structure,
As shown in FIG. 3, the surface S1 of the bent portion 11a, the surface S2 of the circuit conductor 21, the surface S4 of the bent portion 11b, the surface S5 of the circuit conductor 31, and the circuit conductor 21a in the connection region.
Surface S3 of the circuit conductor 31a and the surface S6 of the circuit conductor 31a can be brought into direct contact with each other, a sufficient contact area can be secured, and the connection reliability is excellent. Moreover, the insulating materials 28, 3 covering the circuit conductors 21-27, 31-37
8 does not need to be peeled off, and the connection operation can be reliably performed in a short time.

In this connection method, the connection member 11
Is coated with a low-melting-point metal such as tin, solder, or the like, in the third step, after the low-melting-point metal coated on the connecting member 11 is heated and melted by energization, it is joined to the circuit conductors 21 and 31. Since the solidification occurs at the interface, the bonding becomes stronger due to the metal bonding, and the contact resistance is further reduced, so that the connection reliability can be further improved.

The connecting member 11 is made of copper, copper alloy,
The structure is made of iron, carbon steel, stainless steel or alloy steel.

If the connecting member 11 is made of copper or a copper alloy, the electric resistance of the copper and the copper alloy is small, so that the circuit resistance at the connecting portion can be reduced.

The connecting member 11 is made of iron, carbon steel,
When made of stainless steel or alloy steel, since these materials have high mechanical strength, they do not buckle when penetrating the linear connection member 11 through the flat conductor wiring boards 20 and 30, so that the connection work is not performed. Can be performed more reliably.

If the tip of the connection member 11 is formed into a pointed shape, the connection member 11 is driven from one surface of the stacked flat conductor wiring boards 20 and 30 to penetrate the circuit conductors 21 and 31 in the connection area. It is easy to do.

As described above, the connection method and connection structure of the flat conductor wiring board of the present invention are not limited to the specific structure of the above-described embodiment, and the structure or steps may be modified, added or deleted as needed. Needless to say, such a configuration may be adopted.

For example, in the above, an example in which two layers of flat conductor wiring are connected to each other is shown. However, the present invention is not limited to this, and three or more layers of flat conductor wiring are stacked. It goes without saying that the present invention can be applied to the case of connection.

[0029]

As described above, according to the method and structure for connecting circuit conductors of the flat conductor wiring board of the present invention, the insulating material covering the plurality of circuit conductors can be removed without peeling.
A plurality of flat conductor wiring boards are superimposed at positions where desired connection regions in the circuit conductor overlap with each other, and the circuit conductor in which the linear connection members are superposed in the connection region penetrates, and both ends of this connection member are After bending in the same direction along the surface of each flat conductor wiring board to form a bent portion, both bent portions of this connecting member are heated and pressed to soften or melt the insulating material interposed in the connection region. Since each bent portion of the connecting member is brought into direct contact with the circuit conductors and the circuit conductors while extruding the material to the adjacent region, a sufficient contact area can be secured and the connection reliability is excellent. In addition, since it is not necessary to peel off the insulating material covering the circuit conductor, the connection operation can be reliably performed in a short time.

When the connecting member is coated with a low melting point metal, the low melting point metal coated on the connecting member solidifies at the joining interface after being heated and melted by heating in the third step. The bonding further strengthens the bonding and further reduces the contact resistance, so that the connection reliability can be further improved.

When the connecting member is made of copper or a copper alloy, the electric resistance of the copper and the copper alloy is small, so that the circuit resistance at the connecting portion can be reduced.

When the connecting member is made of iron, carbon steel, stainless steel or alloy steel, since these materials have high mechanical strength, the connecting pins of the connecting member penetrate the flat conductor wiring board. The connection work can be performed more reliably without buckling at the time of the connection.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a method of connecting circuit conductors of a flat conductor wiring board of the present invention, wherein (a) shows a first step and a second step, and (b) shows a third step.

FIGS. 2A and 2B are cross-sectional views showing a method of connecting circuit conductors of the flat conductor wiring board of the present invention, wherein FIGS. 2A and 2B show a first step, FIG. 2C shows a second step, and FIG. ) And (e) represent the third step by a PP section in FIG. 1 (a) or a QQ section in FIG. 1 (b).

FIG. 3 is a cross-sectional view showing details of a connection portion according to a method of connecting circuit conductors of the flat conductor wiring board of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Connection member 11a, 11b Bent part 11c Penetration part 20, 30 Flat-type conductor wiring board 21-27, 31-37 Circuit conductor 28, 38 Insulation material

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Atsuhiko Fujii 1-7-10 Kikuzumi, Minami-ku, Nagoya-shi, Aichi F-term in Harness Research Institute, Inc. (reference) 5E344 AA02 AA21 BB02 BB05 CC08 CD13 DD07 DD11 EE21

Claims (6)

[Claims] 1. A method of connecting circuit conductors of a flat conductor wiring board, wherein the circuit conductors of a plurality of flat conductor wiring boards each having a circuit conductor covered with an insulating material are electrically connected to each other. A first step of superimposing a plurality of flat conductor wiring boards at positions where desired connection regions in a circuit conductor overlap with each other, and penetrating a circuit conductor in which a linear connection member is superposed in the connection region; A second step of bending both ends of the connecting member in the same direction along the surface of each flat conductor wiring board to form a bent portion, and heating and pressurizing both bent portions of the connection member, thereby forming each bent portion. A third step of directly contacting each bent portion with the circuit conductor and the circuit conductor in the connection region while extruding the softened or molten insulating material interposed between the portion and the circuit conductor and the circuit conductor into another region. Characterized by Connection method for circuit conductors on flat conductor wiring boards. 2. The method according to claim 1, wherein the connection member is coated with a low melting point metal. 3. The method according to claim 1, wherein said connecting member is made of copper, copper alloy, iron, carbon steel, stainless steel or alloy steel. 4. A connection structure of circuit conductors of a flat conductor wiring board, wherein the circuit conductors of a plurality of flat conductor wiring boards each having a circuit conductor covered with an insulating material are electrically connected to each other. For a plurality of flat conductor wiring boards superimposed at positions where desired connection regions in circuit conductors overlap each other,
The connecting member of the wire penetrates the circuit conductor overlapped in the connection area, and a bent portion is formed by bending both ends of the connecting member in the same direction along the surface of each flat conductor wiring board. In the connection area, each bent portion and the circuit conductor and the insulating material interposed between the circuit conductors are extruded to other regions, and each bent portion, the circuit conductor and the circuit conductor are in direct contact with each other. Connection structure of circuit conductors on flat conductor wiring boards. 5. The connection structure for circuit conductors on a flat conductor wiring board according to claim 4, wherein said connection member is covered with a low melting point metal. 6. The connection structure for circuit conductors of a flat conductor wiring board according to claim 4, wherein said connection member is made of copper, copper alloy, iron, carbon steel, stainless steel or alloy steel.