JPH11149951A - Joined body of flexible wire distribution body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To join conductor-naked part exposed out of an insulating film to counterpart conductors at high precision. SOLUTION: This joined body comprises flexible wire distribution bodies 10, 11 having a plurality of conductor-naked parts 3A exposed out of insulating films 2, 4 for joining. The respective conductor-naked parts 3A are joined to corresponding counterpart conductors 3 (3A) in a crossed state each other. Consequently, pitch difference of respective conductor-naked parts 3A and the counterpart conductors 3 (3A) to be joined with the conductor-naked parts 3A can be absorbed in the mutual cross joined state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joined body of flexible wiring bodies, and more particularly, to a joined body of flexible wiring bodies used for internal wiring of OA equipment, home electric appliances, automobiles and the like.

[0002]

2. Description of the Related Art Referring to FIG. 12, which is a schematic plan view of a conventional example, a flexible wiring body 1 is a laminated body that generically includes a flexible flat cable and a flexible printed circuit. As an example of such a flexible wiring body 1, a conductor pattern is formed by arranging a substantially linear conductor 3 on a base film 2 and then a coverlay film 4 is formed on the conductor pattern. Are laminated, a part of the plurality of conductors 3 constituting the conductive pattern is respectively exposed from a part of the flexible wiring body (the flat cable in the illustrated example) 1 and each exposed part is exposed. A conductor 7 is formed by joining the conductor 3 in parallel with the corresponding conductor 3 on the other side by anisotropic conductive film, solder, or the like. In the example shown in the figure, since the configuration is adopted in which the conductors 3 and 3 are joined by soldering, the openings 5 for exposing the conductors are formed on both insulating films (the base film 2 and the coverlay film 4). Is provided.

[0003]

When the flexible wiring members 1 are joined as described above, the conductors 3 formed on the individual flexible wiring members 1 are precisely positioned with respect to the conductors 3 to be joined. Therefore, it is necessary to prevent short-circuiting with other conductors and poor connection.

However, the fact that the material of the flexible wiring body 1 employs an insulating film (base film 2 or cover lay film 4) which is difficult to obtain dimensional accuracy,
In recent years, it has been required to splice a plurality of divided flexible wiring bodies 1 in order to constitute a large-sized circuit. It was often difficult to match the pitch precisely.

Therefore, as shown in FIG. 13 which is a schematic plan view showing the problem of the conventional example, when the flexible wiring bodies 1 are displaced from each other when the flexible wiring bodies 1 are connected, the conductive There has been a problem that the body-exposed portions 3A and 3A are also displaced, resulting in poor conduction. Further, as shown in FIG. 14 which is a schematic plan view showing another aspect of the problem of the conventional example, even if a part of the conductor 3 has a slight pitch defect (P1> P2), There was also a problem that connection with the conductor on the side could not be made.

Further, as shown in FIG. 15, which is an enlarged schematic plan view showing another aspect of the problem of the conventional example, when soldering, an adhesive or the like is employed as a method of joining the conductor 3,
In some cases, a poor connection may occur even if it looks as if the connection is good on a plane. That is, as shown in FIG. 16A, which is a cross-sectional view taken along the line AA in FIG.
For example, in the case where the joining by the solder 6 is good, the solder 6 is turned between the upper conductor 3 and the lower conductor 3, but as shown in FIG.
Is attached only to the upper conductor 3,
In some cases, a state of contact failure occurred.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and enables a conductor exposed from an insulating film to be bonded to a counterpart conductor with high accuracy. It is an object of the present invention to provide a joined body of flexible wiring bodies capable of obtaining a finish.

[0008]

In order to solve the above-mentioned problems, the present invention comprises a pair of insulating films and a plurality of conductors laminated between the two insulating films to form a conductive pattern. In the joined body of the flexible wiring body which exposes a part of each conductor to form a conductor exposed portion for bonding, the conductor exposed portion is a partner to which the conductor exposed portion is to be connected. A flexible wiring body that is joined only to the other conductor while intersecting with the other conductor.

In the invention including the specific matter, when the exposed conductor portion of the flexible wiring body having the exposed conductor portion for joining is electrically and mechanically joined to the other conductor, The exposed portions cross each other and are joined to the corresponding counterpart conductors. As a result, the pitch deviation between the exposed portions of the conductors and the opposing conductors joined to the exposed portions of the conductors is absorbed by the joining states crossing each other. here,
The conductor on the other side may be a conductor of a flexible wiring body, or may be formed on another wiring board.

[0010] Further, as a mode of "joining the exposed conductor portion only to the opposing conductor", the exposed conductor portion may be aligned with an opposing interval longer than the width dimension of the conductor. With respect to those arranged at opposing intervals smaller than the width dimension, a configuration may be adopted in which only the portion constituting the conductor exposed portion is expanded in the width direction. In a preferred aspect, the conductor has a portion forming a parallel conductive pattern, and the conductor exposed portion is
It is bent with respect to the parallel conductive pattern.

In the invention including the specific matter, even when a plurality of flexible wiring bodies are joined along a straight line, the joined portions can be reliably crossed to conduct electricity.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
A preferred embodiment of the present invention will be described in detail. FIG. 1 is a schematic plan view showing an embodiment of the present invention,
(A) shows a state before the flat cables 10 and 11 as a flexible wiring body are joined, and (B) shows a state where both flat cables are joined to form a joined body 20. FIGS. 2 and 3 are schematic partial plan views showing the operation of the joined body 20 shown in FIG. 1 (B), and FIG.
It is a partial enlarged schematic diagram which expands and shows the principal part of (B).

Referring to FIGS. 1A and 1B, the illustrated embodiment shows an example in which a joined body 20 is formed by joining two flat cables 10 and 11 formed in pieces. Is shown. Each flat cable 10, 11
Are formed by arranging a plurality of conductors 3 forming a predetermined conductive pattern on a base film 2 made of resin and covering the conductors 3 with a cover lay film 4 also made of resin to form an integrated laminate. Make up. Each flat cable 10,
When the openings 5 are provided in 11, the two insulating films (the base film 2 and the coverlay film 4) provided with the openings 5 may be joined as a pair, like the conventional flat cable 1. Flat cable 1
For 0, base film 2 and cover lay film 4
And for the other flat cable 11, one film (the coverlay film 4 in the illustrated example)
Alternatively, an opening 5 may be provided in the vicinity of one end edge.

In each case, each flat cable 10,
The conductors 3, 3 are partially exposed by the openings 5 of the eleventh opening, and the exposed conductor portions 3A for joining are formed in parallel with each other. Here, in the illustrated embodiment,
The conductor exposed portion 3A opened by the opening 5 is
By bending in the same direction with respect to the covering portion 3B of the conductor 3, the conductor exposed portion 3A of one flat cable 10 and the conductor exposed portion of the other flat cable 11 as shown in FIG. 3A are symmetrical to each other.

In this state, as shown in FIG. 1 (B), the flat cable 10 is placed on the upper side, and the opening 5 of the flat cable 11 is vertically opposed to the opening 5 of the lower flat cable 11. Individual conductor exposed part 3
A is joined to the corresponding exposed conductor 3A on the other side to form a joined body 20. Then, the opening 5 of the joined body 20
Is closed by an insulating sheet (not shown).

In the above-described configuration, the two flat cables 1
When the conductors 0 and 11 are joined, the conductor exposed portions 3A are joined in a state of intersecting with the conductor exposed portions 3A to be connected to the conductor exposed portions 3A.
Even if the position shift has occurred in the flat cable 11 itself or the pitch shift (P1> P2) has occurred in the conductor exposed portions 3A, 3A... Of the flat cables 10, 11 as shown in FIG. The positional deviation and the pitch deviation are absorbed by the intersecting state of the conductor exposed portions 3A, 3A,..., So that a reliable bonding state can be obtained.

Further, as shown in FIG. 4, during the soldering, the solder 6 turns along the edge of one of the exposed conductor portions 3A to the upper surface of the other exposed conductor portion 3A. As a result, the bonding state of the solder 6 can be visually confirmed. As described above, the embodiment according to the present invention has a remarkable effect that a highly reliable bonding structure and a good finish can be obtained.

FIG. 5 et seq. Show another embodiment of the present invention. First, FIG. 5 is a schematic plan view showing another embodiment of the present invention. FIG. 5A shows a state before the printed circuit board 40 is joined to the flat cable 10 of FIG.
Indicates a state in which both are joined to form a joined body 21. As shown in FIGS. 5A and 5B, the joined body 21
May be a printed circuit board 40 connectable to the flat cable 10 in FIG. 1 in addition to the flat cables 10 to 12 illustrated in FIGS.

Also in this case, the flat cable 1
By crossing the conductor exposed portion 3A of 0 with the conductor 41 formed on the printed circuit board 40, the same operation and effect as the embodiment of FIG. FIGS. 6A and 6B are schematic plan views showing still another embodiment of the present invention, wherein FIG. 6A shows a state before the flat cable 13 and the printed circuit board 40 are joined, and FIG. It shows the state that it is doing.

As shown in FIGS. 6A and 6B, at least one of the conductors (printed in the illustrated example) is used to cross and connect the exposed conductor 3A and the conductor 41 on the other side. It is sufficient that the conductor 41) formed on the substrate 40 bends and extends obliquely, and depending on the connection mode, a conventional flat portion forming the conductor exposed portion 3A extending linearly with the covering portion 3B. It is possible to configure the joined body 22 by employing the cable 1.

FIG. 7 is a schematic plan view showing still another embodiment of the present invention.
4 shows a state before the joining, and FIG.
3 shows the state of the image forming apparatus 3. FIGS. 7A and 7B
As shown in (2), when forming the conductor exposed portion 3A, an opening 5 for opening a portion different from the conductor exposed portion 3A formed at the end may be provided in the middle part of the flat cable 14. In the illustrated example, the opening 5 is the conductor 3
Obliquely intersect with the flat cable 11 and the flat cable 11 shown in FIG.

FIG. 8 is a schematic plan view showing another flat cable 15 to which the present invention can be applied. FIG.
FIG. 3 is a schematic plan view showing still another embodiment of the present invention, in which (A) is a state before the flat cable 16 is processed,
(B) shows the state of the flat cable 16 after processing. Referring to these drawings, a flat cable 15 to which the present invention can be applied has a conductor 3 exposed from both insulating films 2 and 4 to form a conductor exposed portion 3A. You may.

In this case, like the flat cable 15 shown in FIG. 8, the conductor exposed portion 3A may be bent by wiring or the like, and FIGS. 9A to 9B 8), after the conductor exposed portion 3A is formed, it may be bent by performing a bending process to finish the same shape as the flat cable 15 in FIG. FIG.
5A is a schematic plan view showing still another embodiment of the present invention, wherein FIG. 5A shows a state before the flat cables 17 and 17 are bonded, and FIG. 5B shows a state in which both are bonded to form a bonded body 24. ing.

As shown in FIGS. 10A and 10B, when the exposed conductor 3A is joined by using ultrasonic welding, a hot-melt adhesive, or an anisotropic conductive film, a flattened portion is required. Only one of the insulating films 2 and 4 at the end of the cable 17 is removed to form the conductor exposed portion 3A, and the flat cable 17 having the same specification is joined in a pair to form the joined body 24. Good.

FIG. 11 is a schematic plan view of another flat cable 18 to which the present invention can be applied. Each of the above-described embodiments shown in FIGS. 1 to 10 is particularly effective when the width of the conductor 3 is narrower than the gap between the wired conductors 3. Therefore, as shown in FIG. 12, for the flat cable 18 in which the width of the conductor 3 is wider than the distance between the conductors 3 and 3 (the width b in FIG. 11), as shown in FIG. The width a of the terminal side where the conductor exposed portion 3A is formed may be set to be larger than the width W of the conductor 3.

As described above, the above-described embodiment is merely an example of a preferred specific example of the present invention, and the present invention is not limited to the above-described embodiment. It goes without saying that various design changes are possible within the scope of the claims of the present invention.

[0027]

As described above, according to the present invention,
In electrically and mechanically joining a flexible wiring body having a conductor exposed portion for joining with a conductor of a partner, each conductor exposed portion and a conductor of the partner to be joined to these conductor exposed portions are joined. As a result of the pitch deviation from the body being absorbed by the intersecting joining states, a remarkable effect that a highly reliable joining structure and a good finish can be obtained can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an embodiment of the present invention, in which (A) shows a state before a flat cable as a flexible wiring body is bonded, and (B) shows a state in which both flat cables are bonded to form a bonded body. This shows the configuration state.

FIG. 2 is a partial plan view showing the operation of the joined body shown in FIG. 1 (B).

FIG. 3 is a partial plan view showing the operation of the joined body shown in FIG. 1 (B).

FIG. 4 is a partially enlarged schematic diagram showing an enlarged main part of FIG. 1 (B).

FIG. 5 is a schematic plan view showing another embodiment of the present invention;
(A) shows a state before the printed circuit board and the flat cable of FIG. 1 are joined, and (B) shows a state in which the two are joined to form a joined body.

FIG. 6 is a schematic plan view showing still another embodiment of the present invention, wherein (A) shows a state before the flat cable and the printed circuit board are joined, and (B) shows a state where the two are joined to form a joined body. The state is shown.

FIG. 7 is a schematic plan view showing still another embodiment of the present invention, in which (A) is a state before the flat cable is joined,
(B) has shown the state which both were joined and the joined body was comprised.

FIG. 8 is a schematic plan view showing another flat cable to which the present invention can be applied.

FIG. 9 is a schematic plan view showing still another embodiment of the present invention, in which (A) is a state before the flat cable is joined,
(B) has shown the state which both were joined and the joined body was comprised.

FIG. 10 is a schematic plan view showing still another embodiment of the present invention, wherein (A) is a state before the flat cable is joined,
(B) has shown the state which both were joined and the joined body was comprised.

FIG. 11 is a schematic plan view of still another flat cable to which the present invention can be applied.

FIG. 12 is a schematic partial plan view of a conventional example.

FIG. 13 is a schematic plan view showing a problem of a conventional example.

FIG. 14 is a schematic plan view showing another aspect of the problem of the conventional example.

FIG. 15 is an enlarged schematic plan view showing another aspect of the problem of the conventional example.

16 is a cross-sectional view taken along line AA of FIG. 15, where (A) shows a non-defective product and (B) shows a defective product.

[Explanation of symbols]

2 Base film (insulating film) 3 Conductor 3A Conductor exposed part 4 Coverlay film (insulating film) 5 Opening 10-18 Flat cable (flexible wiring) 20-24 Joint

Claims (2)

[Claims] 1. A bonding method comprising: a pair of insulating films; and a plurality of conductors laminated between the two insulating films to form a conductive pattern. In the joined body of the flexible wiring body forming the conductor exposed part, the conductor exposed part is a conductor of the other party in a state where the conductor exposed part crosses the conductor of the other party to be connected. A bonded body of a flexible wiring body, which is bonded only to 2. The joined body of flexible wiring bodies according to claim 1, wherein said conductor has a portion for forming a parallel conductive pattern, and said conductor exposed portion is provided with said parallel conductive pattern. A joined body of flexible wiring bodies that is bent with respect to.