JPS58947Y2 - Coaxial cable connection - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a coaxial cable connection.

Conventionally, to connect a coaxial cable whose outer conductor is a metal braid and a connector outer conductor, only the ends of the outer braided conductor are folded back to the outside to make the outer diameter of only the ends larger, and a relatively large pushing force is applied to the connector. A method in which the outer conductor of the connector and the outer conductor of the coaxial cable are connected using only pressure contact force, or the outer conductor of the connector is inserted between the outer braided conductor and the insulator, and the outer conductor of the coaxial cable is inserted from the outside of the outer braided conductor. The method used was to connect the two by crimping a crimping ring.

These connection methods have the disadvantage that the pressure contact force between the two decreases over a long period of use, and the degree of connection failure gradually increases.

Poor connection causes problems such as increased noise.

On the other hand, in order to eliminate the connection failure mentioned above, a method is known in which the external braided conductor and the connector external conductor are directly soldered. There is a problem that the insulating layer made of polyethylene, which is used exclusively as a constituent material, deforms to a greater or lesser extent due to melting or softening, and this deformation greatly reduces the signal transmission characteristics of the connection part. Currently, cable connections are only used for extremely limited applications in the low frequency range.

Although there have been proposals to use fluororesin or other heat-resistant resins as constituent materials for the above-mentioned insulators, fluororesins are extremely expensive, and other heat-resistant resins have poor flexibility, resulting in Due to the problem that the insulating layer part of polyethylene is easily broken, it is currently used for only a very limited number of special purposes, even more so than polyethylene.

By the way, according to research by the present inventors, ASTM D 1238-70 (260°C, 5 kg)
The melt index measured at 5-80.23°C has a density of 0.82-0.85, preferably 0.83-0.
84. An aliphatic hydrocarbon vinyl compound containing at least 60% by weight of 4-methylpentene-1 polymerization component;
-Crystalline copolymer with methylbenzone-J (hereinafter, this copolymer is referred to as 4-methylpentene-1 copolymer).

), the soldering described above has heat deformation resistance that does not substantially deform during connection, has excellent electrical insulation properties, and also has flexibility.

The present invention proposes a novel coaxial cable connection part as claimed in the claims of the utility model registration, which was completed based on the above-mentioned new knowledge.

The accompanying drawing is a sectional view of an embodiment of the present invention, in which 1 is a plug-type connector having an internal conductor pin 2, a support 3 made of an insulator, a cap nut 4, and a connector main body 5.

6 is a coaxial cable consisting of an inner conductor 7, an insulating layer 8 made of a 4-methylpentene 1 copolymer, a braided outer conductor 9, and a protective layer 10.

At the tip of the coaxial cable, the inner conductor 7, insulator layer 8, and braided outer conductor 9 are exposed, and the tip of the inner conductor 7 is inserted into the inner conductor pin 2 of the connector and soldered with solder 11.

The tip of the insulating layer 8 is inserted into the connector main body 5.

A connector body 5 is provided between the braided outer conductor 9 and the insulator layer 8.
The front end of the connector main body 5 and the braided outer conductor 9 are soldered with solder 12.

As the solder used therein, those commonly used for soldering copper and copper alloys can be used, but those with a melting point of 400° C. or lower are preferable.

The 4-methylpentene-1 copolymer used in the present invention is produced, for example, by a method of polymerizing 4-methylpentene-1 and a copolymerization component described below using a Ziegler type catalyst.

Copolymerization components include ethylene, propylene, butene,
Pentene, hexene, octene, 3-methyl-butene-
1,3-methyl-pentene-1,4,4'-dimethyl-
Examples include pentene-1,3-methyl-hexene-1 and even higher carbon number (preferably about C25 or less) linear or branched aliphatic hydrocarbon vinyl compounds.

One type of copolymerization component may be used, or two or more types may be used.

However, the 4-methylpentene-1 polymerization component is at least 6
It needs to be 0% by weight.

On the other hand, the aliphatic hydrocarbon vinyl compound polymerization component is 0.5
It is preferably at least 1% by weight, particularly at least 1% by weight.

The 4-methylpentene-1 copolymer has excellent flexibility compared to the 4-methylpentene-1 homopolymer.

Therefore, ordinary chemicals such as anti-aging agents and pigments may be added as long as they do not impair this flexibility.On the other hand, for soldering, a small amount may be used as long as it does not impair properties (heat deformation resistance). A plasticizer such as Nobiichi olefin oligomer may be blended and used.

[Brief explanation of the drawing]

The attached figure is a sectional view of an embodiment of the present invention, in which 1 is a plug-type connector, 6 is a coaxial cable, 8 is an insulator layer made of 4-methylpentene-1 copolymer, 9 is a braided outer conductor, 5
1 is a connector body of a plug type connector, and 12 is solder.

Claims (1)

[Claims for Utility Model Registration] A connecting portion of a coaxial cable whose outer conductor is made of a metal braid, the coaxial cable having an insulator made of a crystalline copolymer of an aliphatic hydrocarbon vinyl compound and 4-methylpentene 1. The melt index measured by ASTM D 1238-70 (260°C, 5 kg) is 5 to 80.23°C and the density is 0.82 to 0.85.4-methylpentene-1 polymerized component. A connecting part of a coaxial cable, characterized in that the content thereof is at least 60% by weight, and the outer conductor of the cable and the connector are soldered.