JP2540912Y2 - Flat cable - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-core flat cable used for wiring in a device such as a large computer or a telephone exchange.

[0002]

2. Description of the Related Art Since wiring in equipment such as a large-sized computer and a telephone exchange does not take up space and wiring work to a flat connector is easy, for example, as shown in FIG.
Are arranged around the outer periphery of a coaxial wire D provided with a shield layer C coaxially around the insulator B. A flat cable in which the side surfaces G of the outer sheath E of the adjacent core wires F are bonded (fused) to each other is often used. In particular, for transmission of data signals, the coaxial strand D
A coaxial flat cable in which a plurality of core wires F provided with a plurality of core wires are arranged and bonded or fused is used.

[0003] Flat connectors are attached to the longitudinal ends of these flat cables. In a flat connector, the pitch between the contacts is equal, and the pitch is 2.
54 mm or 1.27 mm is often used. In addition, connectors having a contact pin number of up to about 50 cores have been put to practical use.

In the flat cable shown in FIG. 9, the pitch P between the conductors A of the adjacent core wires F depends on the width Q of the outer sheath E. This results in an error in the pitch P between A.

When a connector is attached to a flat cable, the conductor A of the core wire F at both ends in the width direction of the flat cable is used.
The error of the interval Z between them becomes a problem. When the outer sheath E is extruded and covered by a normal extrusion method, when the variation in the width Q of the outer sheath E is accumulated by the number of the core wires F, the error exceeds an allowable value, and the connector cannot be mounted. There are many. For this reason, conventionally, two types of large and small cores F having different values of the width Q of the outer sheath E have been manufactured,
These core wires F are combined and arranged to obtain a necessary pitch accuracy.

[0006]

However, in the above-mentioned method, two types of cores F having different widths Q of the outer sheath E must be prepared, so that the production is troublesome, and when the cores F are arranged side by side. The combination is also troublesome, and furthermore, it is necessary to prepare more core wires F than is actually required for the combination, and there is a problem that waste is increased.

An object of the present invention is to arrange one kind of core wire having the same width of the outer sheath, and to press the core wire inward from both outer sides in the width direction to obtain a gap between the conductors at both ends in the width direction. It is to provide a flat cable which can be adjusted.

[0008]

As shown in FIGS. 1, 4 and 5, the flat cable according to the present invention comprises one or a plurality of parallel wires 4 provided with an insulator 2 around a conductor 1. As shown in FIG. And a plurality of core wires 6 formed by extruding and covering the outer sheath 5 so as to have a substantially rectangular cross section around the core wires, and a plurality of core wires 6 are bonded or fused to each other. In the above, the concave portion 7 which is depressed inward at the central portion on one side in the width direction of the outer sheath 5 of all or a part of the core wires 6 and the protruding portion 8 which protrudes outward is formed at the central portion on the other side. Then, the protrusion 8 of the other core wire 6 is fitted into the recess 7 of one adjacent core wire 6, and a space 9 is formed between the fitted recess 7 and the protrusion 8.

[0009]

The flat cable according to the present invention has adjacent core wires 6
Since the space 9 is formed between the recessed portion 7 and the protruding portion 8 in which the outer sheath 5 is fitted, the width of the outer sheath 5 is set to be slightly larger than the standard value as the core wire 6, and the number of the core wires 6 is increased. After arranging them side by side, force F is applied to the core wires 6 at both ends in the width direction from outside to inside.
By adding (FIG. 1), as shown in FIG. 3, the protruding portion 8 is deeply pushed into the fitted concave portion 7, and the pitch P (FIG. 1) between the conductors 1 of the adjacent core wires 6 is adjusted. At the same time, the distance between the conductors 1 of the core wires 6 at both ends in the width direction is adjusted to a predetermined value.

[0010]

Embodiment 1 A flat cable according to the present invention is shown in FIG.
As shown in FIG. 4 and FIG.
Or a plurality of strands 4 are arranged in parallel, a shield layer 3 is provided thereon, and a plurality of cores 6 provided with an outer sheath 5 on the outside are arranged side by side. Bonding or heat fusion.

The element wire 4 comprises a conductor 1 and an insulator 2 provided around the conductor 1, and a shield layer 3 is provided therearound. Specifically, the outside of the conductor 1 made of a 0.26 mm soft copper wire is coated with an insulator 2 made of foamed polyethylene to have an outer diameter of 0.6 mm.
An 8 mm soft copper wire is spirally tightly wound to form a shield layer 3 having a characteristic impedance of 50Ω.

The outer sheath 5 is formed by extrusion-coating a thermoplastic resin on the outer side of the shield layer 3 so as to have a substantially rectangular cross section. A projecting portion 8 projecting outward is formed at the center. The concave portion 7 and the projecting portion 8 have a V-shaped or U-shaped (arc-shaped) side surface so that they can be fitted to each other.

In the case of a V-shape, as shown in FIG. 2, the angle θ _{1 of the} recess 7 is, for example, about 100 °, and the angle θ _{2 of the} projection 8 is
Is desirably about 120 °. Further, the length L from the tip of the concave portion 7 to the tip of the protruding portion 8 is about 1.20 mm,
The difference (N−M) between the depth N of the recess 7 and the height M of the protrusion 8 was set to about 0.14 mm.

In the present invention, as shown in FIG. 4, only the outer surface 11 of the core wire 6 disposed at both ends in the width direction of the flat cable may be flat without forming a concave portion or a projecting portion.
By doing so, the entire width of the cable can be further stabilized.

As shown in FIG. 5 and FIG. 6, the core wire 6 in the present invention is composed of two or more wires 4 in which an insulator 2 is applied to a conductor 1, and a shield layer 3 is provided on the wires. The outer sheath 5 may be provided on the outside. Further, the concave portion 7 and the protruding portion 8 on one side in the width direction of the outer sheath 5 of the core wire 6 may be formed in a U-shape (arc shape).

In the present invention, a plurality of the core wires 6 are arranged in the lateral direction, and the protrusion 8 of the other core wire 6 is fitted into the recess 7 of the adjacent one core wire 6 so that the fitted concave portion is formed. A space 9 is formed between 7 and the projection 8. In this case, for example, twenty-five core wires 6 each having a width of 1.27 mm of the outer sheath 5 are arranged side by side, and the middle of the adjacent core wires 6 in the longitudinal direction is fused to each other.
As shown in FIG. 1, a fusion-bonded portion 12 is formed, and the other portion is formed as a non-fusion portion 13 without fusion, and the fusion portion 12 and the non-fusion portion 13 are alternately repeated to form a flat type cable. And
Incidentally, the length of the fused portion 12 is about 50 mm,
Was about 300 mm in length.

In this case, as shown in FIG. 1, a force F is applied to the fusion splicing portion 12 from the lateral direction to adjust the depth of insertion of the protruding portion 8 into the concave portion 7, thereby adjusting the width of the space portion 9, and The distance Z (FIG. 1) between the conductors 1 of the core wires 6 at both ends in the width direction is 3
The core wire 6 was heated to 1.75 mm (1.27 × 25 cores) by a heat press 15 as shown in FIG. 7 in this state, and the outer sheaths 5 of the core wire 6 were fused together. . As a result, a flat cable was obtained in which the pitch between the conductors 1, the spacing Z between the conductors 1 at both ends in the width direction of the flat cable, and the total width W of the flat cable were stable.

[0018]

Embodiment 2 As shown in FIGS. 5 and 6, a conductor 1 formed of a tin-plated soft copper wire of 0.26 mm is coated with a polyethylene insulator 2 to form a wire 4 having an outer diameter of 0.8 mm. Aluminum-polyester (Al-PET) outside the strands 4
A shield layer 3 is formed by shielding with a tape, and an outer sheath 5 is formed by extrusion-coating PVC on the shield layer 3. Projection 8 protruding outward in the center of the side in an arc shape
To form a cord 6. Here, the curvature r ₁ of the concave portion 7 in FIG. 6 is about 1.6 mm, the curvature r ₂ of the projection 8 is about 2 mm,
The length L from the tip of the concave portion 7 to the tip of the protrusion 8 is about 2.
5 mm. At this time, the difference (N−M) between the depth N of the recess 7 and the height M of the protrusion 8 was about 0.10 mm. The characteristic impedance of the core wire 6 was about 100Ω.

Twelve core wires 6 are arranged side by side in parallel, and the width of the flat cable obtained from both sides in the width direction is 2.
The core wires 6 are aligned by applying a force so as to be 30.48 mm, which is 12 times as large as 54 mm, and in this state, intermittently in the longitudinal direction as shown in FIG. 8 by using the hot press machine 15 shown in FIG. It was fused to form a blind type flat cable. Here, in each of the above embodiments, only the wire 4 covered with the shield layer 3 is shown, but the present invention can be applied even when the shield layer 3 is not provided.

[0020]

[Effect of the Invention] The flat cable of the present invention has the following effects. a. By simply applying a force from both outer sides in the width direction of the multiple core wires 6, the spacing Z (FIG. 9) between the conductors 1 of the core wires 6 at both ends in the width direction of the flat cable can be adjusted, and the connector is attached. Is easy. b. This is very convenient because it is not necessary to prepare several types of core wires having different outer sheath widths as in the conventional case.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a flat cable according to the present invention.

FIG. 2 is a detailed view of a core wire which is a component of the flat cable of FIG. 1;

FIG. 3 is an explanatory view showing a state in which a force is applied from a side to two core wires arranged.

FIG. 4 is a longitudinal sectional view showing a second embodiment of the flat cable of the present invention.

FIG. 5 is a longitudinal sectional view showing a third embodiment of the flat cable of the present invention.

FIG. 6 is a detailed view of a core wire which is a component of the flat cable of FIG. 5;

FIG. 7 is an explanatory view of a case where a large number of cords are hot-pressed and fused.

FIG. 8 is a plan view of the flat cable of the present invention.

FIG. 9 is a longitudinal sectional view showing an example of a conventional flat cable.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Conductor 2 Insulator 3 Shield layer 4 Element wire 5 Outer sheath 6 Core wire 7 Depression 8 Projection part 9 Space part

Claims (1)

(57) [Scope of request for utility model registration] 1. One or a plurality of wires 4 provided with an insulator 2 around a conductor 1 are arranged in parallel, and an outer sheath 5 is extruded around the wire so as to have a substantially rectangular cross section. In a flat cable formed by arranging a plurality of core wires 6 side by side and bonding or fusing adjacent core wires 6 to each other, in the width direction of the outer sheath 5 of all or some of the core wires 6 A concave portion 7 that is depressed inward at the center of one side and a protruding portion 8 that protrudes outward is formed at the central portion of the other side, and the protruding portion 8 of the other core 6 is inserted into the concave 7 of one adjacent core 6. Insert
A flat cable, wherein a space portion 9 is formed between the fitted concave portion 7 and the protruding portion 8.