JPH08106960A - Coaxial cable connector - Google Patents

Abstract

(57) [Summary] [Object] To provide a connector for a coaxial cable in which the center conductor of the connector or the center conductor of the coaxial cable is not damaged even if the temperature range of the heat cycle is widened. According to the coaxial cable connector of the present invention,
The central conductor of the coaxial cable connector including the central conductor 1 and the outer conductor 2 arranged concentrically around the outer periphery of the central conductor 1 and the insulating spacer 3 for holding the central conductor 1 and the outer conductor 2 at a predetermined interval is part of the central conductor. It has a bellows-like expandable conductor 4. 【effect】

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coaxial cable connector. More specifically, the present invention relates to a coaxial cable connector that is not damaged even when subjected to a heat cycle or the like when the coaxial cable connectors are connected and used.

[0002]

2. Description of the Related Art As is well known, a coaxial cable has a center conductor and an outer conductor formed of a metal sheath or the like provided coaxially with the center conductor on the outer side of the center conductor. Insulator made of plastic etc. to hold,
It consists of a protective coating made of plastic or the like around the outer conductor. When such a coaxial cable is used, it is connected to a connection box or other coaxial cable at the terminal, and a coaxial cable connector dedicated to the coaxial cable is usually used for the connection.

FIG. 2 shows an example of a conventional coaxial cable connector. In FIG. 2, 11 is a center conductor, 12 is an outer conductor, and 13 is an insulating spacer, which is the center conductor 11 and the outer conductor 12.
It is a disc-shaped member that holds and at appropriate intervals. The center conductor 11 is made of a conductive material such as brass, and is connected to the center conductor 14 of the coaxial cable by screwing or caulking using a sleeve or the like. Like the center conductor 11, the outer conductor 12 is made of a conductive material such as brass, and is the outer conductor 1 of the coaxial cable.
5 is connected by crimping or screwing.

The insulating spacer 13 is an insulator made of plastic such as fluororesin and serves as a means for holding the central conductor 11 and the outer conductor 12 at appropriate intervals and fixing the central conductor 11 for movement in the longitudinal direction of the coaxial cable. ing. Reference numeral 16 in the figure is an insulator of the coaxial cable.
The outer conductor 12 can be divided into, for example, an outer conductor body 12A and an outer conductor front flange 12B, and the bolt 1
It is designed to be integrally fixed at 2C. Reference numeral 1 in the figure
2D and 12E are inner flanges for positioning the insulating spacer 13.

Reference numerals 11A and 11B in the figure denote positioning flanges for the central conductor 11. The outer conductor 12 and the outer conductor 15 of the coaxial cable are crimp-fixed and electrically connected by tightening the crimp ring 19 into the shell 20 screwed to the outer conductor 12. A sealing member 18 made of a sealing tape or the like is provided across the shell 20 and the protective coating 17.

[0006]

By the way, recently, coaxial cables have been made longer along with higher output, and there are increasing cases in which they are installed outdoors such as CATV. The installation environment of outdoor installations is much more severe than that of indoor wiring, and the operating temperature range is wider, so that coaxial cables to be used must be able to withstand a wide temperature range. On the other hand, even if the conventional coaxial cable connector described above does not cause any problem in the conventional usage environment, the following problems may occur when the usage temperature range is widened.

In the coaxial cable, the metal center conductor 14 and the protective coating 17 and the insulator 16 made of plastic are used.
Has a different linear expansion coefficient from that of the protective coating 17 and the insulator 1.
Since 6 has a larger linear expansion coefficient than the central conductor 14, the protective coating 17 and the insulator 16 contract when the temperature becomes low, and the central conductor 14 relatively projects from the cable end surface. The same phenomenon is observed when the materials of the central conductor 14 and the outer conductor 15 are different and the linear expansion coefficients are different. When the center conductor 14 of the coaxial cable protrudes from the cable end surface in this way, the center conductor 14 acts to protrude the center conductor 11 of the connector connected to the center conductor 14, but the connector does not extend in the longitudinal direction of the coaxial cable. As described above, the center conductor 11 is fixed to the insulating spacer 13, the insulating spacer 13 is fixed to the outer conductor 12, and the outer conductor 12 is fixed so that the connection failure does not occur in the connector portion even if the load of
Is integrally fixed to the outer conductor 15 of the coaxial cable and the protective coating 17 of the coaxial cable by the seal member 18, the center conductor 11 of the connector cannot move and the center conductor 11 of the connector or the center conductor of the coaxial cable. 14
Either or both of them will bend or be damaged.

At a high temperature, the protective coating 17 and the insulator 16 stretch, so that the center conductor 14 relatively retracts from the cable end surface. When the center conductor 14 of the coaxial cable is retracted from the end face of the cable, the center conductor 14 acts so as to retract the center conductor 11 of the connector connected to the center conductor 14, but the center conductor 11 of the connector may move. Therefore, either the center conductor 11 of the connector or the center conductor 14 of the coaxial cable will break. Such a phenomenon is further promoted when there is a difference in linear expansion coefficient between the metal central conductor 14 and the outer conductor 15.

An object of the present invention is to solve the above problems and to provide a coaxial cable connector in which the center conductor of the connector or the center conductor of the coaxial cable is not damaged even if the temperature range of the heat cycle is widened. To do.

[0010]

The present invention has the following means in order to solve the above problems.

The coaxial cable connector of the present invention is provided with a center conductor, an outer conductor concentrically arranged around the outer periphery of the center conductor, and an insulating spacer for holding the center conductor and the outer conductor at a predetermined interval. The connector is characterized in that the central conductor has a bellows-shaped expandable conductor in a part thereof.

[0012]

According to the coaxial cable connector of the present invention, the coaxial cable connector is provided with the center conductor, the outer conductor concentrically arranged on the outer periphery of the center conductor, and the insulating spacer for holding the center conductor and the outer conductor at a predetermined interval. Since the central conductor of has a bellows-shaped expandable conductor in a part thereof, when the coaxial cable connector of the present invention is attached to the coaxial cable, the central conductor of the coaxial cable undergoes heat cycle. Even if it protrudes or retracts from the cable end face, the bellows-shaped conductor provided in a part of the center conductor of the connector that connects with the center conductor of the coaxial cable expands and contracts freely, so that the connector attached to the coaxial cable Neither the center conductor nor the center conductor of the coaxial cable is damaged.

[0013]

The present invention will be described below in detail with reference to examples. FIG. 1 is a sectional view showing an embodiment of the coaxial cable connector of the present invention. Note that, in FIG. 1, the same members as those in the related art are designated by the same reference numerals, and detailed description thereof will be omitted. In FIG. 1, 1 is a central conductor, 2 is an outer conductor, and 3 is an insulating spacer. The center conductor 1 is made of a conductive material such as brass. The outer conductor 2 is concentrically arranged on the outer periphery of the center conductor 1 and is made of a conductive material such as brass, like the center conductor 1. The conductive material of the center conductor 1 and the outer conductor 2 is not limited to brass, but other copper alloys, aluminum alloys, etc. may be used.

The central conductor 1 has a bellows-shaped expandable conductor 4 in the middle thereof. Bellows-shaped flexible conductor 4
A copper alloy such as brass or an aluminum alloy is used as the material. Both ends of the expandable conductor 4 are integrally fixed to the linear center conductor 1 by brazing. The expandable conductor 4 is electrically the same in outer diameter as the central conductor 1 so that the impedance is the same as that of the central conductor 1. The insulating spacer 3 is an insulator made of plastic such as fluorine resin, and the insulating spacer 3 holds the center conductor 1 and the outer conductor 2 at appropriate intervals.

The outer conductor 2 can be divided into an outer conductor body 2A and an outer conductor front flange 2B, and a bolt 2C.
It is designed to be fixed together. Reference numeral 2D in the figure,
2E is an inner flange for positioning the insulating spacer 3. In the figure, reference numerals 1A and 1B are positioning flanges for the central conductor 1, and the male conductor provided on the outer periphery of the central conductor 1 is screwed onto the flanges 1A and 1B having female threads to fix them on both sides of the insulating spacer 3. Positioning of the tip of No. 1 is performed.

The above-mentioned coaxial cable connector is attached to the coaxial cable as follows. The protective coating 17 of the coaxial cable is peeled off for a predetermined length, and the center conductor 1 of the coaxial cable 1
4 and the outer conductor 15 of the coaxial cable are exposed for a predetermined length,
The shell 20 and the crimp ring 19 are previously inserted on the outer conductor 15 of the coaxial cable. The center conductor 14 of the coaxial cable and the center conductor 1 of the connector are connected by soldering or brazing, and then the outer conductor 1 of the coaxial cable.
The outer conductor 2 of the connector is positioned so that the wedge portion 2F at the tip thereof is inserted under 5, and the shell 20 previously covered by the coaxial cable is screwed to the outer conductor 2 of the connector and tightened. As a result, the outer conductor 15 of the coaxial cable is crimped and fixed to the outer conductor 2 of the connector via the crimp ring 19. Finally, the outer conductor 2, the outer conductor 15 of the coaxial cable, and the protective coating 17 of the coaxial cable are integrally fixed and sealed by a seal member 18 made of a sealing tape or the like.

When the connector attached to the coaxial cable as described above undergoes heat cycle and the center conductor 14 of the coaxial cable projects from the end face of the cable, the center conductor 14 is connected to the center conductor 14 of the connector. Although the center conductor 1 of the connector has a bellows-like expandable conductor 4, the expandable conductor 4 contracts by the amount of protrusion and moves the center conductor 1 in the axial direction. The connector is not damaged.

When the center conductor 14 of the coaxial cable is retracted from the end face of the cable, the center conductor 14 acts so as to retract the center conductor 1 of the connector connected to the center conductor 14, but the retractable conductor 4 is used. It is possible to prevent the center conductor 1 from moving in the axial direction due to the extension by the retracted amount and to damage the connector. Even if the expandable conductor 4 contracts by the protrusion amount or extends by the retracted amount, its outer diameter does not change significantly, so that the impedance of the central conductor 1 including the expandable conductor 4 does not change.

[0019]

As described above, according to the coaxial cable connector of the present invention, the center conductor and the outer conductor concentrically arranged on the outer periphery of the center conductor and the insulation for holding the center conductor and the outer conductor at a predetermined interval are provided. Since the center conductor of the coaxial cable connector provided with the spacer has a bellows-shaped expandable conductor in a part thereof, when the coaxial cable connector of the present invention is attached to the coaxial cable, the center of the coaxial cable is Even if the conductor projects or retracts from the cable end surface due to heat cycle, the bellows-shaped conductor provided in a part of the center conductor of the connector that connects with the center conductor of the coaxial cable expands and contracts elastically, so it is coaxial. Neither the center conductor of the connector attached to the cable nor the center conductor of the coaxial cable is damaged. Even if the expandable conductor contracts by the protrusion amount or extends by the retracted amount, its outer diameter does not change significantly, so that the impedance of the central conductor of the connector including the expandable conductor does not change.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a coaxial cable connector of the present invention.

FIG. 2 is a sectional view showing an example of a conventional coaxial cable connector.

[Explanation of symbols]

 1 center conductor 2 outer conductor 3 insulating spacer 4 expandable conductor

Claims (1)

[Claims] 1. A coaxial cable connector comprising a center conductor, an outer conductor concentrically arranged on the outer periphery of the center conductor, and an insulating spacer that holds the center conductor and the outer conductor at a predetermined interval, the center cable comprising: A connector for a coaxial cable, wherein the conductor has a bellows-like expandable conductor in a part thereof.