JP2002352921A - Connector for coaxial cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To dissolve the point where a film face is apt to break, when it is tightened strongly, and an inner conductor of the coaxial cable falls off, when weakly tightened in order to mount the cable on a connector. SOLUTION: This is the connector 10 provided with a split sleeve part 18 of a type where a high-frequency coaxial cable 20, having a thin film incapable of being soldered is made to be the exterior conductor 26 is inserted and made to be coupled, and a wedge-state claw 30 for preventing position drift between the coaxial cable inserted along a sleeve and a connector body 12 is provided, and when the coaxial cable and the connector are connected, the claw is put to push a cable dielectric body 24, in such a degree that it is deformed slightly in the drifting direction from a nearly vertical direction, and the coaxial cable is fixed by a coupling nut 14 and a clamping ring 16. With the coaxial cable having 1.5 to 3.0 mmϕ for outside diameter and the amount of dielectric body deformation being 0.04 to about 7%, fitting state becomes proper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a connector for a coaxial cable. More specifically, it is a continuation component for selecting a relatively thin core wire as an internal conductor, surrounding the core wire with a dielectric, and connecting a coaxial cable having a metal thin film formed as an external conductor on the outside thereof to another electric member. Related to connectors.

[0002]

2. Description of the Related Art A thin coaxial cable,
Care must be taken when handling an external conductor composed of an extremely thin metal thin film of 5 μm or less. One of the reasons is
The connection with the connector cannot be strongly tightened with the tightening tool on the split sleeve part of the connector (the thin film is broken if it is strongly tightened). Another reason is that the tightening is loose and the connector is connected to the connector of another electric member. In such a case, a problem that the center conductor of the connector is pushed out and the coaxial cable comes off from the connector easily occurs. For further reasons,
This is because brazing (fixing with solder) cannot be performed because the external conductor is thin.

[0003]

As a method of connecting a cable that cannot be soldered to a connector, a cable is inserted into a metal split sleeve, and the split sleeve is connected by, for example, a ring-shaped fastener. There are known ways to do this. By using this method, the connector can be easily attached to a coaxial cable that is difficult to solder, such as a high-frequency coaxial cable whose external conductor is formed of a thin film. However, when mounting this coaxial cable for mounting, the inner conductor of this coaxial cable is pushed back depending on the degree of tightness of the mating connector with the internal conductor socket, and the coaxial cable itself is removed from the connector. There was a problem that it came off.

FIG. 7 schematically shows this situation. The coaxial cable 20 is wrapped around an inner conductor 22 by a dielectric 24, and the outer side is covered by an outer conductor 26. The coaxial cable 20 is connected to the split sleeve 18 at the connector 10.
The coaxial cable 20 can be inserted along. After the coaxial cable is housed in the connector body 12, the coupling nut 14 is fastened and fixed to the mating connector (connector (f)) 40.

In the present invention, a high-frequency coaxial cable in which the outer conductor 26 is covered with a thin film is used. Since the outer conductor is a thin film formed by depositing or plating metal, the mechanical strength is low and the film surface is easily cracked or peeled.
Of course, soldering is impossible. As already mentioned, to mount this thin-film coated coaxial cable to the connector for mounting, if it is strongly tightened, the membrane surface is easily broken due to deformation of the underlying dielectric, and if the tightening is weak, the inner conductor of the coaxial cable is pushed back. Therefore, the coaxial cable itself often falls off from the connector. According to actual measurements, the pushing force of the connector at this time was about 10 N · f. If you tighten the sleeve of the connector too much to prevent this coaxial cable from coming off,
A new problem arises in that the outer conductor of the coaxial cable cracks when tightened.

[0006]

The connector according to the present invention is an improved technique applicable to a thin film coaxial cable, in which a wedge-shaped claw is provided in the connector, and the wedge is connected to a high-frequency cable. This is to prevent the coaxial cable from coming off by pressing. At this time, the coaxial cable can be fixed by the connector sleeve with a weak force enough to take the ground.

According to a first aspect of the present invention, there is provided a connector provided with a sleeve into which a high-frequency coaxial cable having a thin film that cannot be soldered (waxed) as an outer conductor can be inserted. Equipped with a wedge-shaped claw that can prevent misalignment with the connector, when connecting the high-frequency coaxial cable to the connector, ideally from the vertical direction (preferably from an angle close to vertical),
This is a coaxial cable connector having a function of pressing the claws.

According to a second aspect of the present invention, in the first aspect of the present invention, the reduction of the dielectric cross section caused by pressing the wedge-shaped claw is adjusted to a range of 0.04% to 7.07%. Features.

Further, according to a third aspect of the present invention, in the first aspect of the present invention, the wedge is positioned so as to be at least 0.05 mm inside the outer conductor surface and at least 0.18 mm outside the inner conductor. It presses a claw-shaped claw and specifies an appropriate position of a wedge-shaped claw.

[0010]

The thin film of the outer conductor may crack in the thin film of the outer conductor of the coaxial cable depending on the pressing amount of the wedge-shaped claws. However, since the crack occurs inside the connector, even if a temporary crack occurs, the connector itself functions as an external conductor, and does not exert any adverse electric effect.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a thin-film coaxial cable applied to a connector according to the present invention. The coaxial cable 20 includes an inner conductor (core wire) 22, a dielectric 24, and an outer conductor (thin film) 26. The cross-sectional area of the dielectric 24 is represented by S. Next, FIG. 2 is a cross-sectional view illustrating a state in which a wedge-shaped claw 30 is pressed against the thin-film coaxial cable shown in FIG. 1 from the side. Fig. 2 shows the tip of the wedge-shaped claw.
As shown in (1), the distance (position) from the inner conductor surface to the tip of the wedge-shaped claw and the distance (position) from the outer surface of the outer conductor to the tip of the claw are determined. These two amounts (lengths) are defined as the pressing amount of the wedge-shaped claws. The area S of the dielectric is determined by the pressing amount of the wedge-shaped claws.
Also changes naturally. And this deformation is the connector body 12
This has the effect of preventing the coaxial cable (entire) 20 from being pulled out. FIG. 3 is a longitudinal sectional view showing a state in which the wedge-shaped claws 30 are pressed, so that the coaxial cable 20 does not come out of the connector main body 12.

[0012]

<Embodiment 1> FIG. 4 shows an embodiment of the present invention. The wedge-shaped claws are pressed against in the manner already described. After the coaxial cable 20 is inserted along the split sleeve portion, the tab 30
The connector body 12, the outer conductor 26 and the dielectric 2
4 so that it is deformed to some extent. At this time, the amount of deformation of the dielectric 24 is 0.04% to 7.0 in section reduction rate.
A range of 7% is preferred. This amount of deformation is known empirically, and is particularly suitable for coaxial cables having an outer diameter of 1.5 mm to 3.0 mm. Therefore, the outer diameter of the coaxial cable is less than 1.5 mm or 3.0 m.
For those exceeding m, it is preferable to select a condition similar to the relationship of this embodiment (the relationship between the wedge-shaped claws and their positions). <Embodiment 2> FIG.
FIG. 4 is a longitudinal sectional view showing a state where the wedge-shaped claws are pushed and spread, closed at an original position after inserting a coaxial cable, and pressed against a wedge-shaped claw. Even if the wedge-shaped claws are removed, the coaxial cable (entire) 20 will not be pulled out if the effect of pressing against the dielectric 24 remains. <Embodiment 3> Coaxial cable outer diameters of 2.99 and 1.68
A high-frequency coaxial cable in which the outer conductor (each unit: mm) was formed of a thin film was prepared so that the distance between the connectors was 100 mm. Keep the sleeve tightened to the extent that the ground of the outer conductor can be taken out, and the amount of wedges applied varies within a range of 0.05 mm or more inside the outer conductor surface of the coaxial cable and 0.18 mm or more outside the inner conductor. An experiment was conducted and the insertion loss was measured. As a result, no coaxial cable was disconnected due to attachment, and no insertion loss and no deterioration in VSWR were observed. Table 1 shows the results.

FIG. 6 shows a longitudinal sectional view of the coaxial cable having an outer diameter of 1.68 mm used in the experiment. The claw is of a spiral type and has a cable with an outer diameter of 2.99 mm (Fig. 3
Slightly different from the dielectric 24 of the coaxial cable.
There is no difference in the action of deforming.

[0014]

[Table 1]

[0015]

When the wedge-shaped claws of the present invention are used,
The problem of coaxial cable disconnection is completely eliminated. As a result, the sleeve does not need to be tightened by an excessive force, so that electrical connection can be made without damaging the thin film which is the outer conductor of the coaxial cable.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view (schematic diagram) of a coaxial cable provided to a connector of the present invention.

FIG. 2 is a cross-sectional view for explaining the positions and pressing amounts of wedge-shaped claws used when inserting the coaxial cable of the present invention.

FIG. 3 is a longitudinal sectional view for explaining that when a wedge-shaped claw of the present invention is pressed, the core wire is not pulled out of the coaxial cable even if the core wire is pressed.

FIG. 4 is a longitudinal sectional view illustrating a state in which the present invention is being carried out and showing a situation in which a wedge-shaped claw is pressed after a coaxial cable is inserted.

FIG. 5 is an explanatory view (longitudinal sectional view) illustrating an example of the present invention, in which a wedge-shaped claw is detached after a coaxial cable is inserted.

FIG. 6 is an explanatory view (longitudinal sectional view) showing an example of the present invention and showing a thin example (outer diameter = 1.68) as a coaxial cable.

FIG. 7 is a longitudinal sectional view of a connector showing an example of the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 SMA (m) connector 12 Connector body 14 Coupling nut 16 Tightening ring 18 Split sleeve 20 Coaxial cable (whole) 22 Inner conductor 24 Dielectric 26 Outer conductor (may be a thin film) 30 Wedge-shaped claw 40 SMA (f ) Connector 42 Inner conductor 44 Dielectric 46 Outer conductor 48 Inner conductor socket 50 Core pin 52 Dielectric

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroki Hoshizaki 500-1, Minamiyama, Yonenogi-cho, Nisshin-shi, Aichi Pref.

Claims (3)

[Claims] 1. A connector provided with a sleeve into which a high-frequency coaxial cable having a thin film that cannot be soldered (waxed) as an outer conductor can be inserted, wherein a misalignment between the high-frequency coaxial cable inserted into the sleeve and the connector is provided. A connector for a coaxial cable having a wedge-shaped claw that can prevent the claw, and having a function of pressing the claw from a direction substantially perpendicular to a deviation direction when connecting the high-frequency coaxial cable to the connector. 2. The method according to claim 1, wherein the reduction in the dielectric cross section caused by pressing the wedge-shaped claws is 0.04% to 7.0%.
Connector for coaxial cable in the range of 07%. 3. The method according to claim 1, wherein the distance from the outer conductor surface is 0.
A connector for a coaxial cable, characterized in that a wedge-shaped claw can be pressed so as to be located at an inner position of at least 05 mm and at least 0.18 mm outside of an inner conductor.