JP4514505B2 - Flat wiring material - Google Patents

Description

The present invention relates to a flexible flat wiring material used for automobiles and electronic devices and a method for manufacturing the same, and more particularly to a flat wiring material that requires joint connection between wiring circuits.

  A flexible flat wiring material used for electric wiring of automobiles, for example, a plurality of electric wires (wiring circuits) having a round cross section or a rectangular cross section formed in a predetermined circuit form, and an insulating coating such as an insulating film When the wiring circuits are jointly connected, the two flat wiring members are connected to each other using a jointer (Patent Document 1), or joint wiring wires are arranged in advance during manufacturing. The joint wiring process is performed by installing (patent document 2).

JP 2002-163937 A (pages 3 to 4, FIGS. 1 to 3) JP-A-6-231622 (page 3, FIG. 3)

  However, when joint wiring processing is performed using a joined body as described in Patent Document 1, a joined body for connecting each wiring circuit is required in addition to the wiring material, which increases the number of parts, thereby reducing product management. There is a problem that it is complicated and the manufacturing cost is increased. Moreover, when the electric wire for joint wiring is previously arrange | positioned at the time of manufacture of a wiring material like patent document 2, the copper clad laminated board (CCL) after arrangement | positioning and the coverlay film (CL) as insulation coating Defects such as voids may occur around the wires arranged in the bonding step, and the quality may be significantly degraded. Furthermore, in this case, there is a problem that the burden of product management increases because fine product number management of each component constituting the wiring material is required depending on whether joint wiring processing is performed or not at the time of manufacturing the wiring material.

The present invention has been made in view of such problems, and an object of the present invention is to provide a flat wiring material that can facilitate product management and joint wiring processing and can reduce manufacturing costs.

The present invention relates to a first and second wiring circuit extending in a predetermined wiring direction and the first and second wiring circuits in a flexible flat wiring material in which a plurality of wiring circuits are provided and covered with an insulating film. And a third wiring circuit wired between the second wiring circuit and a first wiring circuit exposed portion where the insulating film is removed from a predetermined portion of the first wiring circuit and the wiring circuit is exposed. A second wiring circuit exposed portion from which the insulating film in a predetermined portion of the second wiring circuit is removed and the wiring circuit is exposed, and the first wiring circuit exposed portion and the first wiring A portion separated in a strip shape along the wiring circuit is folded back so as to include a part of the first wiring circuit connected to the circuit exposed portion, and the first wiring circuit exposed portion and the second wiring circuit exposed portion Are electrically connected by welding or soldering. A joint wiring portion is formed, and a portion other than the joint wiring portion forms a main wiring portion, and the first and second wiring circuits constitute a shield wiring for the third wiring circuit. It is characterized by.

According to the flat wiring material of the present invention, the first wiring circuit exposed portion and the second wiring circuit exposed portion of the flexible flat main wiring portion are laser processed by the joint wiring portion made of a flat wiring member. Since these are connected by welding or soldering, the wiring material can be formed with a small number of parts, and the manufacturing cost can be reduced. In addition, according to the present invention, since the joint wiring material is disposed on the wiring circuit covered with the insulating film, there is no generation of voids in the insulating film, and the wiring material without deterioration in quality is provided. Can do.

Hereinafter, the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a plan view showing a state of a part of a flexible flat wiring material according to a first reference example of the present invention before joint connection, and FIG. 2 is a plan view showing the state after joint connection. is there. The flat wiring material described below is, for example, a flexible pudding substrate (FPC), a flexible flat cable (FFC), or the like.

  As shown in FIG. 1, the flat wiring material includes a main wiring portion 10 and a joint wiring portion 20, and is made of copper or a copper alloy formed in parallel along a predetermined wiring direction, and is necessary for the conductor exposed portion. A plurality of planar first wiring circuit 11, second wiring circuit 12 and third wiring circuit 13 which have been plated in accordance with the above are synthesized with polyethylene terephthalate (PET), polyethylene naphthalate (PEN) or the like. It is comprised by coat | covering with the insulating film 16 which consists of resin.

  The first to third wiring circuits 11 to 13 constitute a conductor group including a plurality of conductors 17, 18 and 19 arranged in parallel. Among these, the third wiring circuit 13 extends long in the wiring direction, and the first and second wiring circuits 11 and 12 are arranged on both sides of the third wiring circuit 13. Therefore, in order to connect the first and second wiring circuits 11 and 12, joint wiring having a shape straddling the third wiring circuit 13 is necessary. The upper end of the first wiring circuit 11 is in the middle of the third wiring circuit 13, and the lower end of the second wiring circuit 12 is positioned slightly below the upper end of the first wiring circuit 11. Then, the insulating film 16 at the upper end portion of the first wiring circuit 11 is removed to form the opening portion 14, and the terminal portion 17 a of the conductor 17 exposed to the opening portion 14 constitutes the first wiring circuit exposed portion. ing. On the other hand, a bent portion 18b that is bent outward and perpendicular to the wiring direction is formed at the lower end of the second wiring circuit 12, and the insulating film 16 at the tip of the bent portion 18b is removed to open the opening. A portion 15 is formed, and a terminal portion 18a of the conductor 18 exposed in the opening 15 forms a second wiring circuit exposed portion.

  The terminal portion 17 a of the first wiring circuit 11 and the upper end portion of the first wiring circuit 11 connected to the terminal portion 17 a are separated in a band shape by a cutting line 9 along the first wiring circuit 11. The part separated into the strip shape constitutes the joint wiring part 20, and the remaining part constitutes the main wiring part 10. As shown in FIG. 2, the joint wiring portion 20 is turned 90 ° in the surface direction, and the terminal portion 17 a is overlapped with the terminal portion 18 a of the second wiring circuit 12. The terminal portions 17a and 18a are electrically connected by soldering, resistance welding or the like. As a result, the first wiring circuit 11 and the second wiring circuit 12 are connected to each other across the third wiring circuit 13 and can be used as a common wiring circuit.

FIG. 3 is a flowchart showing manufacturing steps of the flat wiring material according to the first reference example.
First, the openings 14 and 15 are formed in the insulating film 16 (S11), the wiring circuits 11 to 13 are formed (S12), and then the insulating film 16 is bonded to each other with the wiring circuits 11 to 13 interposed therebetween. A wiring board including the portion 10 and the joint wiring portion 20 is formed (S13). Next, a part of the wiring board is cut into a strip shape along the cutting line 9 (S14), and the cut strip-shaped portion (joint wiring portion 20) is folded to connect the terminal portions 17a and 18a (S15). The terminal portions 17a and 18a are connected by soldering in the case of FPC or resistance welding (series welding) in the case of FFC, but may be by other methods such as laser welding or ultrasonic welding. Finally, an insulating member (not shown) is attached to the connecting portions of the terminal portions 17a and 18a (S16), thereby completing the flat wiring material with the joint connection.

According to the first reference example , the main wiring portion 10 and the joint wiring portion 20 are integrally formed as a single wiring board, and therefore no separate parts for joint wiring are required. Moreover, there is only one connection location, and the joint wiring work is greatly simplified. In addition, the portions other than the connection portion are covered with the insulating film 16, and the second wiring circuit 12 has a direction in which the terminal portion 18 a extends by the bent portion 18 b after the terminal portion 17 a of the joint wiring portion 20 is folded back. Since the directions coincide with each other, even if the openings 14 and 15 are made relatively large, no short circuit occurs in unnecessary portions.

FIG. 4 is a plan view showing a part of the flexible flat wiring material according to the second reference example of the present invention before joint connection, and FIG. 5 is a plan view showing the state after joint connection. is there.
In the second reference example , the pattern of the second wiring circuit 12 'of the main wiring portion 10' is different from the first one. In this reference example , the second wiring circuit 12 'has a conductor 18c extending again in the wiring direction from the front end side of the bent portion 18b, and is entirely formed in a crank shape.
In the case of this reference example , it is possible to form a branch circuit that branches at the connection portion between the first wiring circuit 11 and the second wiring circuit 12 ′.

6 and 7 are plan views respectively showing a state before connection of some joints of the flexible flat wiring material according to the third reference example of the present invention, and FIG. 8 is a state after connection of the joints. FIG.
In this reference example , the main wiring part 30 and the joint wiring part 40 are separated from each other, and each is constituted by FPC or FFC. As in the first reference example , the main wiring section 30 includes a first wiring circuit 31, a second wiring circuit 32, and a third wiring circuit 33 that are formed in parallel along a predetermined wiring direction. These wiring circuits 31 to 33 also constitute a conductor group composed of a plurality of conductors 37, 38, and 39 arranged in parallel. The second and third wiring circuits 32 and 33 have the same wiring pattern as that of the first reference example , but the end of the first wiring circuit 31 is the same as the end of the second wiring circuit 32. The bent portions 37b and 38b are formed so as to be arranged in the wiring direction position and face each other, and the insulating film 16 at the tip of the bent portions 37b and 38b is removed to form the openings 34 and 35. The terminal portions 37a, 38a of the conductors 37, 38 exposed in the openings 34, 35 constitute first and second wiring circuit exposed portions.

  On the other hand, the joint wiring portion 40 is made of the same FPC or FFC as the main wiring portion 20 and is a belt-like flexible flat member in which a wiring circuit in which a plurality of conductors 41 are arranged in parallel is covered with an insulating film 16. At both ends of the plurality of conductors 41, the insulating film 16 is removed, and the terminal portions 41a and 41b of the conductor 41 are exposed here. And as shown in FIG. 8, this joint wiring part 40 is arrange | positioned orthogonally to a wiring direction so that the terminal part 41a41b may overlap with the terminal parts 37a and 38a of the main wiring part 30, and terminal part 41a, 37a and The connecting portions 41b and 38a are joined by a method such as welding or soldering.

FIG. 9 is a flowchart showing manufacturing steps of the flat wiring material according to the third reference example .
First, the openings 34 and 35 are formed in the insulating film 16 (S21), the wiring circuits 31 to 33 are formed (S22), and then the insulating film 16 is attached to each other with the wiring circuits 31 to 33 interposed therebetween. The part 30 is formed (S23). Next, the strip-shaped joint wiring part 40 is formed by the same process (S24). And the terminal parts 37a and 38a of the main wiring part 30 and the terminal parts 41a and 41b of the joint wiring part 40 are connected (S25). Also in this case, the connection between the terminal portions 37a and 41a and the terminal portions 38a and 41b is preferably soldering in the case of FPC and resistance welding (series welding) in the case of FFC, but in addition, laser welding, ultrasonic waves A method such as welding may be used. Finally, an insulating member (not shown) is attached to the connecting portions of the terminal portions 37a and 41a and the terminal portions 38a and 41b (S26), thereby completing the flat wiring material with the joint connection.

Also in this reference example, the additional parts are limited to only the joint wiring portion 40, and the number of connection locations is two, so the work is easy. In addition, since there is no folded portion as in the first reference example , there is an advantage that the whole can be made thin.

FIG. 10 is a plan view showing a state of the flexible flat wiring member according to the embodiment of the present invention before a joint connection, and FIG. 11 is a plan view showing the state after the joint connection.
As shown in FIG. 10, the flat wiring member includes a main wiring portion 50 and a joint wiring portion 60, and includes a planar first wiring circuit 51 and a second wiring formed in parallel along a predetermined wiring direction. The wiring circuit 52 and the third wiring circuit 53 are configured by covering with the insulating film 16.

  The first and second wiring circuits 51 and 52 are each composed of one conductor 57 and 58, and the third wiring circuit 53 is a conductor group composed of a plurality of conductors 59 arranged in parallel. . And the terminal part 59a of the conductor 59 which comprises the 3rd wiring circuit 53 comprises the connector part by which the insulating film 16 is removed and it connects to the connection terminal which is not shown in figure, and is accommodated in a connector housing. Further, the terminal portion 57a of the conductor 57 of the first wiring circuit 51 forms the first wiring circuit exposed portion by removing the insulating film 16. The conductor 58 of the second wiring circuit 52 is formed shorter than the other conductors 57 and 59 so that the terminal portion 58a is disposed at a position deeper from the tip than the terminal portion 57a, and the terminal portion 58a is formed of an insulating film. 16 is removed to form a second wiring circuit exposed portion.

  Then, the distal end side of the first wiring circuit 51 is cut into a band shape by the cutting line 54 to the position of the terminal portion 58 a of the second wiring circuit 52 along the conductor 57, thereby constituting the joint wiring portion 60. A portion other than the belt-shaped portion constituting the joint wiring portion 60 is the main wiring portion 50. The joint wiring portion 60 is folded 90 ° on a plane so that the terminal portions 57a and 58a overlap (see FIG. 11), and the terminal portions 57a and 58a are connected by a method such as welding or soldering.

  According to this flat wiring material, the third wiring circuit 53 connected to the connector portion can be surrounded by the first wiring circuit 51 and the second wiring circuit 52. If the other end side is connected to the ground potential, these wiring circuits 51 and 52 can function as shield lines of the third wiring circuit 53.

It is a top view before the joint connection of the flat wiring material which concerns on the 1st reference example of this invention. It is a top view after the joint connection of the flat wiring material. It is a flowchart which shows the manufacturing process of the same flat wiring material. It is a top view before the joint connection of the flat wiring material which concerns on the 2nd reference example of this invention. It is a top view after the joint connection of the flat wiring material. It is a top view before the joint connection of the main wiring part in the flat wiring material which concerns on the 3rd reference example of this invention. It is a top view before the joint connection of the joint wiring part in the same flat wiring material. It is a top view after the joint connection of the flat wiring material. It is a flowchart which shows the manufacturing process of the same flat wiring material. It is a top view before the joint connection of the flat wiring material which concerns on embodiment of this invention. It is a top view after the joint connection of the flat wiring material.

10, 30, 50... Main wiring section, 11, 31, 51... First wiring circuit, 12, 32, 52... Second wiring circuit, 13, 33, 53. 34, 35 ... opening, 16 ... insulating film, 17-19, 37-39, 41, 57-59 ... conductor, 17a, 18a, 37a, 38a, 41a, 41b, 57a, 58a, 59a ... terminal, 20 , 40, 60 ... Joint wiring part.

Claims (1)

In a flexible flat wiring material in which a plurality of wiring circuits are provided and covered with an insulating film,
First and second wiring circuits extending in a predetermined wiring direction;
A third wiring circuit wired between the first and second wiring circuits;
A first wiring circuit exposed portion in which the insulating film in a predetermined portion of the first wiring circuit is removed and the wiring circuit is exposed;
A second wiring circuit exposed portion where the insulating film in a predetermined portion of the second wiring circuit is removed and the wiring circuit is exposed;
The first wiring circuit exposed portion and a portion separated in a strip shape along the wiring circuit so as to include the first wiring circuit exposed portion and a part of the first wiring circuit connected to the first wiring circuit exposed portion are folded back to the first wiring circuit. Forming a joint wiring portion in which the wiring circuit exposed portion and the second wiring circuit exposed portion are electrically connected by welding or soldering,
Parts other than this joint wiring part form the main wiring part ,
The flat wiring material, wherein the first and second wiring circuits constitute a shield wiring for the third wiring circuit.

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