JP3602384B2 - Method and connection structure for connecting circuit conductors of flat conductor wiring board - Google Patents

Description

[0001]
TECHNICAL 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, an electric device, or the like.
[0002]
[Prior art]
2. Description of the Related Art Recently, as vehicles and electric devices 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 devices. For this reason, a flat conductor wiring board such as a so-called flexible printed circuit (FPC) or a flexible flat cable (FFC) in which a circuit conductor made of copper foil or the like is covered with an insulating material such as a thin insulating film has a very thin shape. For this reason, it is suitable for arranging in a narrow space in the width direction and performing complicated wiring, and thus it is widely used.
[0003]
FIG. 3 shows an example of a known flat conductor wiring board of this type. The flat conductor wiring boards 81 and 82 are made of copper that forms a conductor pattern on insulating materials 81a and 82a. A plurality of circuit conductors 83 and 84 made of foil or the like are printed, and the upper surfaces thereof are covered with insulating materials 81b and 82b.
[0004]
When the circuit conductors 83 and 84 of the flat conductor wiring boards 81 and 82 are connected to each other, the flat conductor wiring boards 81 and 82 are overlapped so that desired regions of the circuit conductors 83 and 84 overlap each other. It is known that after the metal pin 85 is passed through the desired area, the metal pin 85 and the desired area of the circuit conductors 83 and 84 are ultrasonically welded to connect the circuit conductors 83 and 84. (See, for example, Japanese Patent Application Laid-Open No. Hei 5-110246).
[0005]
However, according to this method, since ultrasonic welding must be performed using a special tool, there is a problem that workability is poor and work time is lengthened if there are many connection points.
[0006]
Therefore, as a simpler connection method, there has been proposed a method of connecting circuit conductors of stacked flat conductor wiring boards using cylindrical rivets.
[0007]
As shown in FIG. 4A, the cylindrical rivet 91 used in this method is made of a conductive material having a shape in which a cylindrical peripheral wall 91b extends downward from a dish-shaped head 91a. The cylindrical rivet 91 is overlapped so that desired regions of the circuit conductors 83 and 84 of the flat conductor wiring boards 81 and 82 shown in FIG. 3 overlap each other, and the portion is penetrated from above the covering 81b. . Next, as shown in the side sectional view of FIG. 4B, the cylindrical rivet 91 is fixed to the connection portion between the flat conductor wiring boards 81 and 82 by caulking while expanding the distal end portion 91c of the peripheral wall 91b outward. Thus, the circuit conductors 83 and 84 of the flat conductor wiring boards 81 and 82 are electrically connected to each other via the outer peripheral surface of the peripheral wall 91b of the cylindrical rivet 91.
[0008]
[Problems to be solved by the invention]
However, in the case of the conventional connection method using the above-described cylindrical rivet 91, as shown in FIG. 4C, which is a cross-sectional view taken along the line SS of FIG. 4B, the inner wall of the peripheral wall 91b indicated by the region R92. Since the circuit conductor 83 is punched in the area surrounded by, the electrical contact surface between the circuit conductors 83 and 84 of the flat-type conductor wiring boards 81 and 82 and the cylindrical rivet 91 corresponds to the peripheral wall 91b indicated by the region R91. Since there is only the outer periphery, a sufficient contact area cannot be ensured, and there may be a problem that the resistance value of the connection portion increases.
[0009]
The present invention has been made to solve the problems of the related art, and can secure a sufficient contact area, is excellent in connection reliability, and can easily perform a connection work. It is an object of the present invention to provide a connection method and a connection structure.
[0010]
[Means for Solving the Problems]
The method for connecting circuit conductors of the flat conductor wiring board of the present invention is a method of electrically connecting circuit conductors of a plurality of flat conductor wiring boards each having a circuit conductor covered with an insulating material, A cylindrical connecting wall extends downward from the dish-shaped head, and a conductor connecting member having a notch extending from the root to the tip in the axial direction of the surrounding wall is used. A plurality of flat conductor wiring boards are overlapped at a position where they overlap with each other, the peripheral wall of the connection member is penetrated in the connection region, and the circuit conductor in the connection region is brought into contact with the entire periphery of the inside and outside of the peripheral wall to conduct. .
[0011]
According to this method, the circuit conductors of each of the flat conductor wiring boards are simply passed through the connection region of the superposed flat conductor wiring boards without peeling off the insulating material covering the circuit conductors. Can be connected, and the connection operation can be easily performed.
[0012]
The connection structure of the circuit conductor of the flat conductor wiring board of the present invention electrically connects the circuit conductors of the plurality of flat conductor wiring boards each formed by covering the circuit conductor with an insulating material, A cylindrical peripheral wall extends downward from a dish-shaped head to a plurality of flat conductor wiring boards that are superimposed at positions where desired connection regions in the circuit conductor overlap with each other, and the head extends in the axial direction of the peripheral wall. A peripheral wall of a connection member of a conductor provided with a notch extending from a root to a tip penetrates in a connection region, and has a structure in which a circuit conductor in the connection region comes into contact with the entire inner and outer circumferences of the peripheral wall to conduct electricity.
[0013]
According to the above configuration, the peripheral wall of the connection member penetrates the insulating material and the circuit conductor in the connection region, whereby the island-shaped circuit conductor formed to be surrounded by the peripheral wall of the connection member is axially formed on the peripheral wall. The number of holding portions corresponding to the number of cutouts provided is held. By the presence of the island-shaped circuit conductors, each circuit conductor comes into contact with the entire inner and outer circumferences of the peripheral wall and conducts, so that it is possible to secure a sufficient contact area, which is advantageous for connection reliability. Become.
[0014]
In the connection structure of the present invention described above, if the number of cutouts provided in the peripheral wall is two or three, a desired contact area can be reliably ensured.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
[0016]
1 and 2 show a configuration example of a connection structure of circuit conductors of a flat conductor wiring board of the present invention.
[0017]
As shown in FIG. 1, this connection structure is composed of circuit conductors 24 of flat conductor wiring boards 21, 22, 23 formed by covering circuit conductors 24, 25, 26 with insulating materials 21a, 22a, 23a, respectively. , 25, 26 are electrically connected to each other. Here, an example is shown in which a flat conductive wiring board 22 connected to the connector 32 and a flat conductive wiring board 23 connected to the connector 33 are branched and connected to the flat conductive wiring board 21 connected to the connectors 30 and 31. .
[0018]
Further, as shown in FIG. 2B, which is a cross-sectional view taken along line PP in FIG. 1, this connection structure includes two flat-type superimposed portions where desired connection regions in circuit conductors 24 and 25 are overlapped with each other. The peripheral wall 11b of the conductor connecting member 11 having a notch 11d extending from the base of the head 11a to the tip in the axial direction of the peripheral wall 11b shown in FIG. 2 (c), in which the circuit conductors 24 and 25 in the connection region are in contact with the entire periphery of the inside and outside of the peripheral wall 11b of the connection member 11 to conduct electricity.
[0019]
Here, as shown in FIG. 2A, three notches 11d are provided extending from the root of the head 11a to the tip in the axial direction of the peripheral wall 11b of the connection member 11, and are taken along the line QQ in FIG. 2B. FIG. 2C shows an example in which the peripheral wall 11b is divided into three parts. Further, the distal end portion 11c of the peripheral wall 11b has a pointed shape, so that it is easy to drive the connecting member 11 into and penetrate the two superposed flat conductor wiring boards 21 and 22.
[0020]
In this conductive structure 10, the peripheral wall 11 b of the connection member 11 penetrates through the insulating materials 21 a and 22 a and the circuit conductors 24 and 25 in the connection region, thereby forming an island surrounded by the peripheral wall 11 b of the connection member 11. As shown in FIG. 2 (c), the circuit conductor 24a is held by three holding portions 24b corresponding to the number of cutouts 11d provided in the axial direction on the peripheral wall 11b of the connection member 11. Since the island-shaped circuit conductors 24a are present, the circuit conductors 24 and 25 come into contact with the entire inner and outer peripheries of the respective peripheral walls 11b indicated by the region R11 of the connection member 11 to conduct, so that a sufficient contact area is secured. This is advantageous for connection reliability.
[0021]
Further, according to this connection method, the peripheral wall 11b of the connection member 11 is connected to the connection region of the superposed flat conductor wiring boards 21 and 22 without peeling off the insulating materials 21a and 22a covering the circuit conductors 24 and 25. The circuit conductors 24 and 25 of each of the flat-type conductor wiring boards 21 and 22 can be reliably connected to each other simply by being penetrated, and the connection operation can be easily performed to improve workability.
[0022]
As shown in the side sectional view of FIG. 2B, after the peripheral wall 11b of the connecting member 11 is made to penetrate through the connecting portions of the flat conductor wiring boards 21 and 22, the distal end 11c of the peripheral wall 11b of the connecting member 11 is formed. It is preferable that the connecting member 11 is fixed to the connecting portions of the flat conductor wiring boards 21 and 22 by caulking while spreading outward. The notch 11d provided in the peripheral wall 11b of the connection member 11 may be configured to provide two or four or more notches and divide the peripheral wall 11b into a number other than three.
[0023]
As described above, the connection structure of the flat conductor wiring board of the present invention is not limited to the specific configuration of the above-described embodiment, and it is needless to say that the configuration may be appropriately modified, added, or deleted as needed. No.
[0024]
For example, in the above description, an example in which branch wiring is performed with reference to FIG. 1 has been described, but the present invention is not limited to this, and the circuit conductors of the upper and lower flat conductive wiring boards illustrated in FIG. It goes without saying that the present invention can be applied to a case where intermediate portions are connected to each other. In any case, the flat conductor wiring board may be configured to overlap three or more layers.
[0025]
【The invention's effect】
As described above, according to the method for connecting a circuit conductor of a flat conductor wiring board of the present invention, a conductor is connected to a connection region of a superposed flat conductor wiring board without peeling off an insulating material covering the circuit conductor. By simply penetrating the peripheral wall of the connection member, the circuit conductors of each flat-type conductor wiring board can be reliably connected to each other, and the connection operation can be easily performed, thereby improving workability.
[0026]
According to the connection structure of the circuit conductor of the flat conductor wiring board of the present invention, the peripheral wall of the connection member of the conductor penetrates the insulating material and the circuit conductor in the connection region, and is thereby surrounded by the peripheral wall of the connection member. Since the formed island-shaped circuit conductors are held by the number of holding portions corresponding to the number of notches provided in the axial direction on the peripheral wall, each circuit conductor is Since contact is made with the entire inner and outer peripheries of the peripheral wall to conduct electricity, a sufficient contact area can be ensured, which is advantageous for connection reliability.
[0027]
In the connection structure of the present invention described above, if the number of cutouts provided on the peripheral wall is two or three, a desired contact area can be reliably ensured.
[Brief description of the drawings]
FIG. 1 is a plan view showing a configuration example of a connection structure of circuit conductors of a flat conductor wiring board of the present invention.
FIGS. 2A and 2B are diagrams illustrating a configuration example of a connection structure of circuit conductors of a flat conductor wiring board according to the present invention, wherein FIG. 2A is a perspective view illustrating a configuration example of a tubular connection member, and FIG. 1, (c) shows a QQ sectional view in (b) when three notches are provided in the peripheral wall in the axial direction.
FIG. 3 is a perspective view showing a method for connecting circuit conductors of a conventional flat conductor wiring board.
4A and 4B are diagrams illustrating another configuration example of the connection structure of the circuit conductor of the conventional flat conductor wiring board, in which FIG. 4A is a perspective view illustrating a configuration example of a cylindrical rivet, and FIG. The side sectional view of the structure is shown, and (c) shows the SS sectional view in (b).
[Explanation of symbols]
Reference Signs List 10 Conductive structure 11 Connection member 11a Head 11b Peripheral wall 11c Tip 11d Notch 21, 22, 23 Flat conductor wiring board 24, 25, 26 Circuit conductor 21a, 22a, 23a Insulating material

Claims (3)

A method of connecting a flat conductor wiring board to electrically connect circuit conductors of a plurality of flat conductor wiring boards each formed by covering a circuit conductor with an insulating material, comprising: A peripheral wall extends downward, and a conductor connecting member having a notch extending from the root to the tip in the axial direction of the peripheral wall is used, and a plurality of flat conductors are provided at positions where desired connection regions in the circuit conductor overlap with each other. A circuit for a flat-type conductor wiring board, wherein a circuit board in the connection area is penetrated in a connection area by superimposing wiring boards, and a circuit conductor in the connection area is brought into contact with the entire circumference of the inside and outside of the peripheral wall to conduct electricity. How to connect conductors. A flat conductor wiring board connection structure for electrically connecting circuit conductors of a plurality of flat conductor wiring boards each formed by covering a circuit conductor with an insulating material, wherein a desired connection area in the circuit conductor is For a plurality of flat conductor wiring boards superimposed at positions overlapping each other, a cylindrical peripheral wall extends downward from a dish-shaped head, and a notch extending from the root of the head to the tip in the axial direction of the peripheral wall is provided. A circuit for a flat-type conductor wiring board, wherein a peripheral wall of a connecting member of a conductor penetrates in a connection region, and a circuit conductor in the connection region has a structure in which the circuit conductor comes into contact with the entire periphery inside and outside of the peripheral wall to conduct electricity. Conductor connection structure. 3. The connection structure for circuit conductors on a flat conductor wiring board according to claim 2, wherein the number of cutouts provided in the peripheral wall is two or three.

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