JPH07201433A - Flexible flat conductor cable connection method - Google Patents

Abstract

(57) [Abstract] [Object] The present invention relates to a method for connecting a flexible flat conductor cable to another conductor, which enables easy and reliable removal of an insulating coating, thereby improving productivity and reliability. An object is to provide a method of connecting a highly flexible flat conductor cable. [Structure] The FPC 1 is placed on a peeling jig 4 having a ring-shaped peeling blade 5 having a diameter smaller than the width of the flat conductor 2 of a flexible flat conductor cable (FPC) 1, and the connecting portion 1a of the FPC 1 is By pressing the punching pin 6 from above, the insulating coating 3 of the connecting portion 1a is peeled off to expose the flat conductor 2, and then the flat conductor 2 is connected to the counterpart circuit body 7.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method of connecting a flexible flat conductor cable to another conductor.

[0002]

2. Description of the Related Art A flexible flat conductor cable (hereinafter, abbreviated as "FPC" in this specification) is a circuit pattern made of a conductor such as copper via an adhesive on an insulating film such as polyimide. It refers to a cable formed by laminating a film similar to the above with an adhesive to form a film.

Such an FPC is flexible and easy to wire because the conductor is patterned on the film, and is often used particularly for connecting complicated circuits and devices. When connecting this FPC and another circuit member, for example, Japanese Patent Laid-Open No. 5-47442 proposes a connecting method as shown in FIG. In the connection method shown in FIG. 10, the pressure contact piece c of the connection terminal b housed in the connection connector a is pressure-contacted with the circuit pattern f of the connection portion where the insulating film e on the surface of the FPCd is removed to perform connection. I have to.

Therefore, since the terminal is pressed against the exposed surface of the conductor of the FPC to form the electrical contact state, the insulating coating of the connection portion must be removed in advance. Therefore, it is good to produce a large number of patterns with the same connection part, but when changing the connection part for each circuit pattern, it is necessary to remove the insulating coating of the corresponding part each time, which is a troublesome insulating coating. However, there is a drawback that the connection must be made after the removal step.

On the other hand, as shown in FIG. 11 and FIG.
A method of making a connection using the through terminal T has also been proposed. The through-type terminal T is provided with a locking piece g. The locking piece g is inserted into the insulating coating h of the FPC d'and then bent as shown in g'of FIG.
The circuit pattern f'of d'is connected. However, the connection method using the through type terminal T has a problem that it is difficult to reduce the size and increase the density of the parts because it is necessary to increase the number of parts and the pitch between the conductors.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and can easily and surely remove the insulating coating of a flexible flat conductor cable, thereby improving productivity and reliability. An object of the present invention is to provide a method for connecting a flexible flat conductor cable having high flexibility.

[0007]

In order to achieve the above-mentioned object, the present invention is a method for connecting a flexible flat conductor cable to another conductor, the flexible flat conductor cable comprising: The flexible flat conductor cable is placed on a peeling jig having a peeling blade that is smaller than the width of the conductor and has a shape corresponding to the shape of the connecting portion, and the flexible flat cable is placed on the peeling blade. The conductor of the flexible flat conductor cable is removed by locating the connecting portion of the conductor cable and pressing the connecting portion against the peeling blade with a punching pin to peel off the insulating coating of the connecting portion. After being exposed, it is characterized in that it is joined to another conductor at the connection portion. It is preferable that a connecting hole is formed in the connecting portion of the flexible flat conductor cable, and solder is supplied through the connecting hole for connection (claim 2). It is preferable that a connecting hole is formed in the conductor on the other side that is connected to the flexible flat conductor cable, and the connecting hole and the conductor of the connecting portion of the flexible flat conductor cable are engaged to connect. (Claim 3).

[0008]

According to the present invention, the FPC is placed on a peeling jig having a peeling blade formed corresponding to the shape of the connecting portion, and pressure is applied thereto to make a cut in the insulating coating and peel off. Therefore, the connection portions can be peeled off by a single operation, and even if there are a plurality of connection portions, the connection portions can be peeled off simultaneously by one operation.
Further, even if the conductor of the connection portion of the FPC extends in a convex shape and there is an adhesive layer between the insulating coating and the conductor, it is automatically peeled off due to the difference in inner and outer diameters with respect to the extension, and the insulating coating of the FPC is peeled off. The productivity of the manufacturing process is significantly improved. Furthermore, since the conductor of the connecting portion projects, the conductor of the mating side can be easily adhered, and a highly reliable connection can be made. As described in claim 2, when the connecting hole of the flexible flat conductor cable is formed and the solder is supplied through the connecting hole, the productivity of the connecting step by the solder is remarkably increased. improves. As described in claim 3, if a connecting hole is formed in the conductor on the other side and the connecting hole is engaged with the conductor of the connecting portion of the flexible flat conductor cable, the connecting hole is connected. The positioning of the connection part is easy and reliable.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing an example of a process of peeling an insulating coating of an FPC in a process of connecting a flexible flat conductor cable (FPC) according to the present invention. FPC1 is
This is a cable formed by covering a flat conductor 2 made of copper from both sides with an insulating coating 3 made of an electrically insulating synthetic resin film.

When connecting the FPC 1 to another conductor, first, the FPC 1 is placed on the peeling jig 4 as shown in FIG. 2 in order to remove the insulating coating 3. Peeling jig 4
Is made of special steel in a plate shape, and has a ring-shaped peeling blade 5 formed in a circular shape and having a diameter smaller than the width of the flat conductor 2 in a peeling recess 4a. The tip of the peeling blade 5 is formed slightly lower than the surface 4b of the peeling jig 4 to protect the cutting edge.

On the peeling jig 2, the predetermined connecting portion 1a of the FPC 1 is positioned on the peeling blade 5, and as shown in FIG. 3, the punching pin 6 is lowered to press the conductor 3 of the FPC 1. . A ring-shaped cut is made in the insulating coating 3 of the pressed FPC 1 by the peeling blade 5. When pressure is further applied, the flat conductor 2 is rolled by the spherical pressing surface 6a at the tip of the punching pin 6, and the flat conductor 2 of the connecting portion 1a projects in a convex shape.
The insulating coating 3 is peeled off in a circular shape, becomes a peeling piece 3a and falls off, and the flat conductor 2 is exposed.

At this time, the pressing force is set so that the flat conductor 2 is not cut. Even if the flat conductor 2 and the insulating coating 3 are bonded to each other, the adhesive extension is automatically separated by the convex extension of the flat conductor 2 and the insulating coating 3 is easily peeled off. Further, since the flat conductor 2 projects at the connecting portion 1a, it becomes easy to connect to the conductor such as the circuit body on the other side.

By providing an air hole 4c penetrating the peeling recess 4a at the center of the ring-shaped peeling blade 5 and applying a negative pressure, the peeling piece 3a of the insulating coating 3 can be reliably removed. , Peeling piece 3a by applying positive pressure
Can be accurately removed from the peeling jig 4.

Next, as shown in FIG. 4, the connecting portion 1a with the exposed flat conductor 2 is brought into close contact with the mating circuit body 7, and the flat conductor 2 and the circuit body 7 are connected to each other with solder 8. Connecting. Alternatively, the flat conductor 2 and the circuit body 7 are connected by welding by irradiation with the laser beam 9.

FIG. 5 is a perspective view showing a peeling jig 10 according to another embodiment of the present invention. The peeling jig 10 is provided with a rectangular peeling blade 11 in the peeling recess 10a, which is different from the ring-shaped peeling blade 5 in the above-described embodiment. By placing the FPC 1 on the peeling jig 10 and pressing it with the kamaboko-shaped punching pin 6 ′, a wide range of the insulating coating 3 can be peeled off.

When peeling a plurality of connecting parts from the FPC 1, as shown in FIG. 6, a plurality of peeling jigs 4 are arranged at respective predetermined positions, and the peeling jig 4 is provided above the peeling jigs 4. Correspondingly, by integrally providing a plurality of ejection pins 6, it is possible to simultaneously perform peeling at a plurality of positions by one pressing operation.

Further, when connecting with the circuit body of the other side by soldering, it is necessary to supply the solder between the joints, but in order to facilitate the soldering process, it is shown in FIG. As described above, at the same time as the operation of peeling the insulating coating 3 of the connection portion 1a of the FPC 1 or after the peeling,
It is also possible to provide a joining hole 12 penetrating to a and to place the joining hole 12 on the counterpart circuit body 7, and to supply solder through the joining hole 12.

When the mating conductor to be connected is a plate-shaped body such as a so-called bus bar, as shown in FIG. 8, a connection hole 14 is formed in the bus bar 13 and the flat conductor 2 of the connecting portion 1a of the FPC 1 is connected. By fitting with the convex portion 2a, positioning and soldering are facilitated, and both can be efficiently connected.

Furthermore, when connecting three or more FPCs in a stacked manner, or in the case of laser welding, it may be necessary to remove the insulating coating on both sides of the FPC. In that case, the peeled FPC may be turned upside down and the peeling step may be performed again with the surface from which the insulating coating has been peeled up facing up. From above the flat conductor 2 with the insulation coating on both sides peeled off,
As shown in FIG. 9, by irradiating the laser beam 15, the circuit body 7 on the other side can be efficiently connected by welding.

[0020]

According to the present invention, since the FPC is placed on the peeling jig and the pressure is applied to peel off the insulating coating of the connecting portion, the peeling of the connecting portion can be performed by a single operation. When there are multiple connecting parts, by using multiple pairs of peeling blades and hammering pins, it is possible to simultaneously peel off each connecting part in a single operation. Is significantly improved. Also,
Since the conductor of the connecting portion extends and protrudes in a convex shape, it is easy to make close contact with the conductor on the other side, and there are advantages such as highly reliable connection.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a process of peeling an insulating coating of a flexible flat conductor cable (FPC) according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which an FPC is placed on the peeling jig shown in FIG.

3 is a cross-sectional view showing a state in which the FPC of FIG. 2 is pressed by a punching pin.

FIG. 4 is an explanatory diagram of a process of connecting the FPC from which the insulation coating has been peeled off in the process of FIG. 3 and the circuit body on the other side.

FIG. 5 is a perspective view of a peeling jig according to a second embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a step of peeling off the insulating coating of the FPC according to the third embodiment of the present invention.

FIG. 7 is an explanatory diagram of a process of connecting an FPC according to a fourth embodiment of the present invention and a circuit body on the partner side.

FIG. 8 is an explanatory diagram showing an example of a process of connecting the FPC of FIG. 4 and a bus bar on the partner side.

FIG. 9 is an explanatory diagram showing a step of performing laser welding after performing the step of FIG. 3 on both sides of the FPC.

FIG. 10 is an explanatory diagram showing a conventional FPC connection method.

FIG. 11 is a perspective view of a through-type terminal used in another connection method of the conventional FPC.

FIG. 12 is an explanatory diagram of a process of connecting an FPC using the through terminal of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible flat conductor cable (FPC) 1a Connection part 2 Flat conductor 3 Insulation coating 4 Peeling jig 5 Peeling blade 6 Ejection pin 12 Joining hole 13 Busbar 14 Connecting hole

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[Procedure amendment]

[Submission date] April 20, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

Claims (3)

[Claims] 1. A method for connecting a flexible flat conductor cable to another conductor, which is smaller than the width of the conductor of the flexible flat conductor cable and is formed corresponding to the shape of the connecting portion. The flexible flat conductor cable is placed on a peeling jig having a peeling blade, the connecting portion of the flexible flat conductor cable is positioned on the peeling blade, and the connecting portion is punched out. By pressing the peeling blade against the peeling blade, the insulating coating of the connecting portion is peeled off to expose the conductor of the flexible flat conductor cable, and then the conductor is joined to another conductor at the connecting portion. A method for connecting a flexible flat conductor cable, characterized by: 2. The connection of the flexible flat conductor cable according to claim 1, wherein a connecting hole is formed in a connecting portion of the flexible flat conductor cable, and the solder is supplied through the connecting hole. Method. 3. A connecting hole is formed in a conductor on the other side to be connected to the flexible flat conductor cable, and the connecting hole is engaged with the conductor of the connecting portion of the flexible flat conductor cable. The method for connecting a flexible flat conductor cable according to claim 1, wherein the flexible flat conductor cable is connected.