JPH0794033A - Flat multiconductor electric wire - Google Patents

Abstract

PURPOSE:To form an electric wire into a flat type, improve flexibility, and eliminate the high-temperature treatment of the contact part of an end part by juxtaposing plural flat electric wires, composed of straight square conductors, at given intervals in a plane state to connect the contact parts in both end parts of respective flat type electric wires by a covering connection tape. CONSTITUTION:Covering 22 composed of insulating material are formed on straight square conductors 21 to compose flat type electric wires 23, and plural flat type electric wires 23 are juxtaposed at given intervals into a plane state. The covering 22 of both end parts of the respective flat type electric wires 23 are separated to expose the respective conductors 21 to form contact parts 25. Conductor connection tapes 26 composed of insulating material are arranged on the back surface sides of both right and left contact parts 25, and the tape 26, respective exposed conductors 21, and the covering 22 in the vicinities of the contact parts 25 are stuck to retain the respective straight square conductors 21 into a connected condition. Plural flat type electric wires 23 composed of these conductors 21 are juxtaposed at given intervals into a plane state to connect the contact parts 25 of both the end parts of the respective electric wires 23 by the connection tape 26 and a connection tape 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat multicore electric wire used for wiring consumer equipment, office automation equipment, vehicle-mounted electronic equipment and the like.

[0002]

2. Description of the Related Art Conventionally, as a flat type multi-core electric wire of this type,
For example, there are those shown in FIGS. 6 and 7, and those shown in FIG. 6 are generally FPC (flexible printed wiring board) and FF.
Called C (flat flexible wiring board), a plurality of elongated flat conductors 1 of thin plate or foil are arranged side by side at a predetermined interval, and the upper and lower surfaces thereof are sandwiching tape 2a over the entire length.
The rectangular conductor 1 is exposed by removing the sandwiching tapes 2a on the upper surfaces of both ends, and the exposed portions of the rectangular conductor 1 are pushed into a connector (not shown) to make contact with internal terminals of the connector. It is supposed to be done.

On the other hand, the flat type multi-core electric wire shown in FIG. 7 is described in Japanese Patent Application Laid-Open No. 3-236112 proposed by the applicant of the present application, in which an insulating coating 6 is applied to a round conductor 5. A plurality of round electric wires 7 are arranged side by side in a plane at a predetermined interval, the coatings 6 at both ends of each round electric wire 7 are peeled off, the round conductors 5 are exposed, and contact portions 8 are formed. The fixing tape 9 disposed on the back surface side of the contact portion 8 is adhered to the exposed round conductors 5 and the coating 6 near the contact portion 8, and
A connecting tape 10 disposed on the surface side near the contact portion 8 is attached to the cover 6.

At this time, in the case of the structure shown in FIG.
Since the conductor 5 and the fixing tape 9 have a round shape, a sufficient fixing force cannot be obtained between the conductor 5 and the fixing tape 9 by using an adhesive alone. Therefore, the whole round conductor 5 is usually coated with tin, and the tin is kept at a high temperature of about 350 ° C. Is melted and tin is permeated into the fixing tape 9 to fix the fixing tape 9 and the round conductor 5 of the contact portion 8.

[0005]

However, F shown in FIG.
In the case of flat type multi-core electric wires such as PC and FFC, since the conductor itself is rectangular and has high bending rigidity in the left-right direction, the conductor 1 is less likely to bend when the connector is inserted into the exposed end of the conductor. , The tapes 2a sandwiching the whole rectangular conductor 1
Since the structure is sandwiched between 2b, the bendability in the left-right direction is lacking, and two-dimensional bent wiring is difficult.

On the other hand, in the case of the flat type multi-core electric wire shown in FIG. 7, since the round conductor 5 is used, the thickness of the whole electric wire is increased as compared with the case shown in FIG. 6 using the rectangular conductor 1. There is also a problem that wiring in a narrow space may be difficult, and even if the conductor has the same cross-sectional area, it is inferior in flexibility due to the round shape.

Further, in the case of FIG. 7, in order to obtain a sufficient fixing force between the round conductor 5 and the fixing tape 9 at the contact portion 8, it is necessary to coat tin only on the exposed portion of the round conductor 5. Considering this, tin is coated on the entire round conductor 5 and treated at a high temperature to dissolve the tin. Therefore, tin coating of the conductor 5 is required, which is time-consuming, and oxidation of the manufacturing jig due to the subsequent high temperature treatment. There is also the problem of inviting such things.

Therefore, the present invention has been made in order to solve the above-mentioned problems, and is thin and excellent in bendability, does not require high-temperature treatment of the contact portion of the end portion, and has narrow space wiring and two-dimensional bending. It is an object of the present invention to provide a flat multicore electric wire that can be wired.

[0009]

A flat multicore electric wire according to the present invention comprises a plurality of flat electric wires each of which is formed by coating a rectangular conductor with an insulating material and arranged in a plane, and each of the flat electric wires. Contact portions formed by exposing the flat conductors by peeling off the coating of the end portions of the flat conductors, the flat conductors disposed on the back surface side of the contact portions and the flat molds in the vicinity of the contact portions. A conductor coupling tape attached to the coating of the electric wire and a coating coupling in which each of the electric wires is sandwiched between the conductor coupling tape which is disposed on the surface side near the contact portion and is attached to the coating near the contact portion. It is characterized by having a tape.

[0010]

In the present invention, a plurality of flat electric wires coated with a rectangular conductor are arranged side by side, so that they are thinner and more flexible than conventional round conductors, and narrow space wiring is possible. Moreover, since the conductor is a rectangular conductor, an adhesive agent may be used to fix the contact portion to the conductor connecting tape, and the high temperature treatment of the contact portion at the end is not required.

On the other hand, as compared with FPC and FFC, even if the same rectangular conductor is used, the two-dimensional bent wiring is possible because the portions other than the contact portions at the ends are in a separated state.

[0012]

1 is a plan view of an embodiment of the present invention, FIG. 2 is a sectional side view taken along line XX 'of FIG. 1, FIG. 3 is an enlarged view of a portion of FIG. 2, and FIG. 4 is a partially enlarged side view of the embodiment shown in FIG. 5, and FIG. 5 is a perspective view of the portion shown in FIG.

As shown in these figures, a rectangular conductor 21 made of copper foil or tin-plated copper foil is extruded to form a coating 22 made of an insulating material such as polyvinyl chloride (PVC) or polyethylene (PE). The flat electric wire 23 is formed by forming the plurality of flat electric wires 23, and the plurality of flat electric wires 23 are arranged side by side at a predetermined interval on a plane.

At this time, the thickness ta of the rectangular conductor 21 is 0.
The thickness tb of the coating 22 is preferably 0.1 to 0.3 mm, and the width w is preferably 0.3 to 1.0 mm.

Further, the line pitch, which is the distance between the centers of the rectangular conductors 21 of the adjacent flat electric wires 23, is 0.5,0.
It is preferably set to 8, 1.0, 1.25 mm or the like.

As shown in FIGS. 1, 4 and 5, the coatings 22 on the left and right ends of each flat electric wire 23 are peeled off to expose each rectangular conductor 21 to form a contact portion 25. Then, the conductor connecting tape 26 made of an insulating material such as polyethylene terephthalate (PET), PVC, or polyimide (PI) is disposed on the back surface side (lower surface side) of both the left and right contact portions 25, and is bonded by an adhesive. The conductor connecting tape 26 and the exposed rectangular conductors 21 and the coating 22 in the vicinity of the contact portions 25 are adhered to each other to hold the rectangular conductors 21 in a connected state.

The adhesive used at this time is, for example, a well-known thermoplastic adhesive, and one that melts at a relatively low temperature of about 200 ° C. is preferable.

On the surface side (upper surface side) in the vicinity of both contact portions 25, as with the conductor connecting tape 26, PET, PVC, P
A cover connecting tape 27 made of an insulating material such as I is provided, and the cover connecting tape 27 and the cover 22 in the vicinity of the contact portion 25 are adhered to each other by the above-mentioned thermoplastic adhesive. The end portions of the flat electric wires 23 are sandwiched between the flat electric wires 23, and the flat electric wires 23 are connected to each other at their both end portions while keeping the distance between the flat electric wires 23 at a predetermined value by the adhesive force of the adhesive. The middle portion of the flat electric wire 23 is not connected and is kept in a separated state.

Therefore, a plurality of flat electric wires 23 composed of the rectangular conductors 21 are arranged in a plane at predetermined intervals, and each flat electric wire 23 is arranged.
By connecting the contact portions 25 at both end portions of the above with connecting tapes 26 and 27, compared to the case of the conventional round conductor shown in FIG. 7 (see Japanese Patent Laid-Open No. 3-236112), it is thin and excellent in flexibility. Wiring in a narrow space is possible, and since the conductor 21 has a flat angle, a sufficient adhesive force can be obtained between the conductor connecting tape 26 and each of the rectangular conductors 21 in the contact portion 25 with an adhesive. The coating and high temperature treatment are not required, and the treatment of the contact portion 25 can be performed extremely easily.

On the other hand, compared with the case of the FPC and FFC shown in FIG. 6, even if the flat conductors are used in the same manner, the contact portions 25 of the flat electric wires 23 are separated from each other.
Since two-dimensional bent wiring is possible and the schematic configuration of the contact portion 25 is almost the same as that of the FPC and FFC, the FP
Existing connectors used for C and FFC can be applied to the contact portion 25, and it is not necessary to separately develop and manufacture a connector having a special structure.

At this time, comparing the connector used for FPC and FFC with the connector for flat multicore electric wire of circular conductor, in the latter case, since the circular conductor is used, the thickness of the connector is inevitable. FPC and F made of the former rectangular conductor
Since the connector is thicker than the FC connector, the connector applied to the flat multicore electric wire of this embodiment is thin, and it is possible to more effectively perform the narrow space wiring.

[0022]

As described above, according to the flat-type multi-core electric wire of the present invention, a plurality of flat-shaped electric wires made of rectangular conductors are arranged in a plane at predetermined intervals, and both end portions of each flat-shaped electric wire are arranged. Since the contact part is connected by the conductor and the covering connecting tape, it is thin and has excellent flexibility, and it does not require the high temperature treatment of the contact part at the end as in the past.
It is possible to provide a flat type multi-core electric wire capable of performing narrow space wiring and two-dimensional bending wiring, which is extremely effective for wiring consumer equipment, office automation equipment, in-vehicle electronic equipment and the like.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a sectional side view taken along line X-X ′ of FIG.

3 is an enlarged view of a part of FIG. 2. FIG.

FIG. 4 is a partially enlarged side view of the embodiment of FIG.

5 is a perspective view of the portion shown in FIG. 4. FIG.

FIG. 6 is a diagram showing a conventional example.

FIG. 7 is a diagram showing another conventional example.

[Explanation of symbols]

 12 Flat Angle Conductor 22 Coated 23 Flat Electric Wire 25 Contact Part 26 Conductor Connection Tape 27 Coated Connection Tape

Claims (1)

[Claims] 1. A plurality of flat electric wires, each of which is formed by coating a flat conductor with an insulating material and arranged in a plane, and the flat conductors are exposed by peeling off the coating of the end portions of the flat electric wires. The contact portion formed by the above, a conductor connecting tape affixed to each of the flat conductors disposed on the back surface side of the contact portion and exposed, and a coating of each of the flat electric wires in the vicinity of the contact portion, and the contact. A flat multicore electric wire, which is provided on the surface side near the contact portion and is attached to the covering near the contact portion, and a covering connecting tape in which the respective electric wires are sandwiched between the conductor connecting tape. .