JP3366594B2 - Multi-wire cable and coaxial 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-wire structure cable and a coaxial cable formed by coating a core wire in which a plurality of conductor wires are bundled with a coating film.

[0002]

2. Description of the Related Art A multi-wire cable attached to a connector or the like and used for signal transmission has, for example, as shown in FIG. 87 is arranged to form a core wire 80, and the outer periphery of the core wire 80 is covered with an insulating coating film 90. This multi-wire structure cable is used alone, and is also used as a core wire of a multi-core cable or a core wire of a coaxial cable.

When attaching such a multi-wire cable to a substrate of a connector or the like, first, the coating film 90 is peeled off at the tip of the cable to expose the core wire 80. Next, the molten solder is applied to the core wire 80, cooled, coated, positioned at a predetermined position (on the terminal), and then pressed while being heated by a pulse heater or the like. This melts the solder, and the core wire 80 can be mounted on the substrate. In FIG. 7B, the exposed core wire 80 is shown.
3 shows that the solder S is held and coated between the respective conducting wires.

[0004]

However, in the multi-wire structure cable having such a structure, since the diameters of the seven conductor wires constituting the core wire are the same and are in close contact with each other, the molten solder is Even if it was applied, it could be attached only to the outer peripheral portion of the peripheral conducting wire, and it was not possible to hold a sufficient amount of solder. For this reason, there is a problem in that the amount of solder is insufficient at the time of mounting on the substrate, and thus mounting error or mounting failure occurs.

The present invention has been made in view of the above problems, and it is possible to coat the core wire with a sufficient amount of solder before soldering, and the solder is insufficient when it is mounted on a substrate or the like. It is an object of the present invention to provide a multi-wire structure cable and a coaxial cable having a configuration that does not cause a mounting error or a mounting failure.

[0006]

[0007]

In order to achieve such an object, a multi-wire structure cable according to the present invention bundles a plurality of conducting wires into a core wire, and the outer periphery of the core wire is covered with an insulating coating. In a multi-wire structure cable covered with a membrane, the number of core wires is 1.
It is composed of a central conductor wire and six peripheral conductor wires of the same diameter arranged so as to surround the outer periphery of the central conductor wire, and the diameter of the central conductor wire is formed smaller than the diameter of the peripheral conductor wire. In the multi-wire structure cable having such a configuration, a gap is generated between the peripheral conductor wire and the center conductor wire, and the melted solder enters the gap during the solder coating, so that a larger amount of solder is held between the conductor wires than before. It In addition, by changing the diameter of the conductive wire in this way, when the core wire is exposed, the conductive wires are likely to come apart, and even more solder can be coated from that surface. For this reason, there is no shortage of solder at the time of attachment to the substrate, and it is possible to prevent mistakes in attachment or defective attachment.

[0008]

Further, the coaxial cable according to the present invention includes the above-mentioned multi-wire structure cable, a conductive shield layer disposed on the outer periphery of the multi-wire structure cable, and an insulating coating for covering the shield layer. It is composed of a membrane. In the coaxial cable having such a configuration, since the multi-wire structure cable is included as it is, the same effect as when the above-mentioned multi-wire structure cable is used alone is obtained, and the soldering is performed when the cable is attached to the board. There is no shortage, and it is possible to prevent a mounting error or a mounting failure.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a multi-wire structure cable and a coaxial cable will be described below with reference to the drawings. 1 and 2 show the structure of a coaxial cable 10 having a multi-line structure cable. As shown in these figures, the coaxial cable 10 has seven conductors 21 to 21.
A core wire 20 in which 27 are bundled, an insulator film 30 that covers the outer circumference of the core wire 20, a conductive shield layer 40 provided on the outer circumference of the insulator film 30, and an outer circumference of the shield layer 40 are covered. The protective film 50 is provided so that The core wire 20 and the insulator film 30 form a multi-wire structure cable.

As shown in FIG. 2, the core wire 20 is composed of one center conductor 21 and six peripheral conductors 22 to 27 arranged so as to surround the outer periphery of the center conductor 21. Here, the diameters of the peripheral conductive wires 22 to 27 are all the same, and the diameter of the central conductive wire 21 is formed larger than the diameter of these peripheral conductive wires 22 to 27. Therefore, each of the peripheral conductive wires 22 to 27 is in contact with the central conductive wire 21, and the peripheral conductive wires 22 to 27 are adjacent to each other with a certain distance.

The insulator film 30 is an insulating coating film made of, for example, PFA (fluorine resin), and electrically insulates the core wire 20 from the outside. The shield layer 40 is formed by braiding a large number of conductive wires, and is provided in layers on the outer periphery of the insulator film 30. The protective coating 50 is, for example, PET
It is an insulating coating film made of (polyester) and electrically insulates the shield layer 40 from the outside.

Further, in the coaxial cable 10, the core wire 20 is twisted at a predetermined pitch and the insulating film 3 is formed.
0, and the shield layer 40 is also twisted at a predetermined pitch and covered with the protective coating 50. This is to make the entire coaxial cable 10 easier to bend, but since durability against repeated bending is also improved, the service life can be extended.

An example of a procedure for attaching the coaxial cable 10 having such a configuration to the terminals on the substrate will be described with reference to FIG. A core wire mounting terminal 61 is provided on the upper surface of the substrate 60, and the core wire 20 is soldered to the core wire mounting terminal 61. Further, a shield layer mounting terminal 62 is also provided on the substrate 60, and the shield layer 40 is mounted on the shield layer mounting terminal 62, but this is not mounted by soldering. Is omitted.

Before soldering, melted solder is used for the core wire 2
Apply to 0. At this time, the melted solder enters between the conductor wires 21 to 27 of the core wire 20 and becomes a state in which the solder necessary for soldering is coated. After such solder coating is completed, the core wire 20 is positioned on the upper surface of the core wire mounting terminal 61, and the pulse heater 70 heated while maintaining this state is pressed from above. As a result, the solder coating is melted, and the core wire 20 is attached to the core wire mounting terminal 61.
To be joined to.

In this way, the coaxial cable 10 has the substrate 6
It is attached to 0, but this coaxial cable 10
In the above, as described above, the peripheral conductive wires 22 to 2 of the core wire 20 are
Since the diameters of 7 are all the same and the diameter of the center conductor 21 is larger than the diameters of these peripheral conductors 22 to 27, a gap is created between the conductors of the peripheral conductors 22 to 27, Since the molten solder enters this gap during solder coating, a larger amount of solder than before is applied to the conductors 21 to 21.
Hold between 27. For this reason, the solder will not run short when mounted on the substrate 60, and mounting mistakes and mounting defects can be prevented. FIG. 4 shows an example of a situation in which the solder S is held between the conductors 21 to 27 of the bare core wire 20.

FIG. 5A is a sectional view of a coaxial cable 110 having a multi-wire structure cable according to the present invention. As you can see from the figure, this coaxial cable 110
Is a core wire 120 formed by bundling seven conductors 121 to 127, an insulator film 130 covering the outer circumference of the core wire 120, and a conductive shield layer 14 provided on the outer circumference of the insulator film 130.
0 and an insulating protective coating 150 provided so as to cover the outer circumference of the shield layer 140. Note that the multi-wire structure cable according to the present invention is composed of the core wire 120 and the insulator film 130, as in the case of the coaxial cable 10.

The core wire 120 of this coaxial cable 110 is 1
It is composed of a central conducting wire 121 and six peripheral conducting wires 122 to 127 arranged so as to surround the outer periphery of the central conducting wire 121. The diameters of the peripheral conductive wires 122 to 127 are all the same, and the diameter of the central conductive wire 121 is the same as those of the peripheral conductive wires 1.
The diameter is smaller than 22 to 127. The configurations of the insulating film 130, the shield layer 140, and the protective coating 150 are the same as those of the insulating film 30, the shield layer 40, and the protective coating 50 in the case of the coaxial cable 10, and thus the description thereof is omitted.

In such a structure, a gap is created between each of the peripheral conductors 122 to 127 of the core wire 120 and the center conductor 121, and as in the case of the coaxial cable 10, the solder melted during the solder coating is formed. Because it enters this gap,
A larger amount of solder than before is held between the conductive wires 121 to 127. For this reason, the solder will not run short when mounted on the substrate 60, and mounting mistakes and mounting defects can be prevented. 5B shows an example of a situation in which the solder S is held between the conductors 121 to 127 of the bare core wire 120.

FIG. 6A is a sectional view of a coaxial cable 210 having a multi-wire structure cable. As can be seen from the figure, this coaxial cable 210 includes a core wire 220 formed by bundling six conductor wires 222 to 227, and a core wire 220.
An insulating film 230 covering the outer periphery of the insulating film, a conductive shield layer 240 provided on the outer periphery of the insulating film 230, and an insulating protective coating 250 provided so as to cover the outer periphery of the shield layer 240. It consists of The core wire 220 and the insulator film 230 form a multi-wire structure cable.

The core wire 220 of the coaxial cable 210 is composed of six conductors 222 to 227 arranged in a ring shape. The conductors 222 to 227 have the same diameter. Insulator film 230, shield layer 240 and protective film 2
The structure of 50 is the insulator film 30 in the case of the coaxial cable 10,
Since it is similar to the shield layer 40 and the protective film 50, the description thereof is omitted.

In such a configuration, the conductor wire 2 of the core wire 220 is
A gap is created in the portion surrounded by 22 to 227, and as in the case of the coaxial cables 10 and 110, the solder melted during solder coating enters this gap, so a larger amount of solder than before is applied between the conductors 222 and 227. Held in. For this reason, the solder will not run short when mounted on the substrate 60, and mounting mistakes and mounting defects can be prevented. Note that FIG. 6B shows an example of a situation in which the solder S is held between the conductive wires 222 to 227 of the bare core wire 220.

As described above, the coaxial cables 10 and 11 are
In Nos. 0 and 210, by changing the diameters of the conductor wires used for the core wires 20, 120 and 220, gaps are formed between the conductor wires, and by inserting solder into the gaps, a larger amount of solder can be coated than before. However, by changing the diameter of the conductor wire in this way, the core wires 20, 120, 22
When the 0 is exposed, the conductors tend to come apart,
From this aspect, it is possible to coat more solder.

Further, the coaxial cables 10, 110, 2
In No. 10, the twist pitch interval of the core wires 20, 120, 220 is made larger than the conventional one. For example, when the conventional twist pitch interval is 1 to 2 mm, it is preferable to set it to 3 to 4 mm. By thus increasing the twist pitch interval, the bundled conductors are likely to be separated when the core wires 20, 120, 220 are exposed, and thus the core wires 20, 120, 220 are coated with a large amount of solder. It will be possible. In addition, the core wires 20, 120, 22 can also be made by making the hardness of each conductor slightly harder than the conventional one.
0 can be easily separated, and the core wires 20, 120,
220 allows more solder to be coated.

Up to now, the multi-wire structure cables according to the present invention have been described as an example in which they are used as a part of the coaxial cable (core wire), but it is of course possible to use these multi-wire structure cables alone. is there. At this time, the effects shown in the above embodiment can be directly obtained. Further, a bundle of a plurality of the above-mentioned multi-wire structure cables may be covered with an insulating protective film to form a multi-core cable, but similar effects can be obtained with such a multi-core cable.

[0026]

[0027]

As described above, the multi-wire structure cable according to the present invention is a multi-wire in which a plurality of conducting wires are bundled into a core wire, and the outer circumference of the core wire is covered with an insulating coating film. In the structural cable, the core wire is composed of one center conductor wire and six peripheral conductor wires of the same diameter arranged so as to surround the outer periphery of the center conductor wire, and the diameter of the center conductor wire is smaller than the diameter of the peripheral conductor wire. Although it is formed, in the multi-wire structure cable with such a configuration, a gap is created between the peripheral conductor and the center conductor, and the melted solder enters into this gap during solder coating. Solder is held between the conductors.
In addition, by changing the diameter of the conductive wire in this way, when the core wire is exposed, the conductive wires are likely to come apart, and even more solder can be coated from that surface. For this reason, there is no shortage of solder at the time of attachment to the substrate, and it is possible to prevent mistakes in attachment or defective attachment.

[0028]

Further, the coaxial cable according to the present invention comprises the above-mentioned multi-wire structure cable, a conductive shield layer arranged on the outer periphery of the multi-wire structure cable, and an insulating coating for covering the shield layer. It is composed of a membrane and
In the coaxial cable having such a configuration, since the multi-wire structure cable is included as it is, the same effect as when the above-mentioned multi-wire structure cable is used alone is obtained, and the soldering is performed when the cable is attached to the board. There is no shortage, and it is possible to prevent a mounting error or a mounting failure.

[Brief description of drawings]

FIG. 1 is a perspective view of a coaxial cable having a multi-line structure cable.

FIG. 2 is a sectional view of the coaxial cable.

FIG. 3 is an explanatory diagram showing a procedure for attaching the coaxial cable to a substrate.

FIG. 4 is an end view of a core wire showing a situation in which the bare core wire is coated with solder in the coaxial cable.

5A and 5B are views showing a coaxial cable having a multi-wire structure cable according to the present invention, in which FIG. 5A is a cross-sectional view of the cable, and FIG. FIG. 6 is an end view of the core wire showing the situation when doing.

6A and 6B are diagrams showing a coaxial cable having a multi-wire structure cable, in which FIG. 6A is a cross-sectional view of the cable, and FIG. 6B is a situation in which a bare core wire of this cable is coated with solder. It is an end view of the core wire showing.

FIG. 7 is a diagram showing a conventional multi-wire structure cable,
(A) is a cross-sectional view of this cable, and (B) is an end view of the core wire showing a situation when the exposed core wire is coated with solder.

[Explanation of symbols]

10 coaxial cable 20 cores 21 center conductor 22-27 peripheral conductor 30 Insulator film 40 Shield layer 50 Protective film

Continuation of the front page (56) Reference JP-A-56-126207 (JP, A) JP-A-48-102276 (JP, A) Actually opened 63-45918 (JP, U) Actually opened 63-56518 (JP , U) Actual development 56-52817 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01B 5/08 H01B 11/06 H01B 11/18

Claims (2)

(57) [Claims] 1. A multi-wire structure cable in which a plurality of conductor wires are bundled to form a core wire, and the outer circumference of the core wire is covered with an insulating coating film. It consists of six peripheral conductor wires of the same diameter, which are arranged so as to surround the outer circumference of the central conductor wire.
A multi-wire structure cable, wherein the diameter of the central conductor is smaller than the diameter of the peripheral conductor. 2. The multi-wire structure cable according to claim 1, a conductive shield layer disposed on the outer periphery of the multi-wire structure cable, and an insulating coating film that covers the shield layer. A coaxial cable that is characterized by.