JPS6127087Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the terminal structure of a shielded wire, and in particular, aims to provide a shielded wire terminal structure that has a simple structure, allows easy connection to a printed board, and can be reliably supported on the printed board. It is something to do.

For example, a shielded wire with a braided wire, such as a high-frequency coaxial cable, may be directly connected to a printed board. Conventionally, as shown in FIG. 1, the end of the braided wire 1 is divided into two, for example, and the two divided braided wires 1 are soldered to the ground conductor attached to the back side of the printed board 2, and the center conductor 3 is soldered. is soldered to a desired conductor, and the cable 5 is further clamped to the printed board 2 using a plated wire 4.

In this way, conventionally, the work of electrically connecting the braided wire 1 to the ground conductor of the printed board 2, and the work of electrically connecting the cable 5
Since the work of clamping the parts to the surface of the printed board 2 is performed separately, there is a drawback that the work efficiency is poor.
Further, since the plating wire 4 is directly pressed against the sheathing of the cable 5, and the plating wire 4 is soldered to the printed circuit board 2 in this state, the coating melts when the plating wire 4 is heated. For this reason, play is likely to occur in the clamped state, and this play causes bending stress to be applied to the soldered portion of the braided wire 1 and the center conductor 3.
There is a risk of disconnection between the braided wire 1 and the center conductor 3, and furthermore, if a strong force is applied to the cable, the plated wire 4 may stretch or come off, resulting in poor reliability.

The purpose of this invention is to provide a shielded wire terminal structure that is easy to install and has high reliability.

FIG. 2 shows an embodiment of this invention. In the figure, 1 shows the braided wire, 3 shows the center conductor, and 5 shows the entire cable.

In this invention, an exposed part of the braided wire 1 is formed at the end of the cable 5, a core member 6 is inserted inside the exposed braided wire 1, and a cylindrical crimping tool is installed on the outside of the braided wire 1. 7 is attached, and the earthing tool member 8 is supported by this cylindrical crimping tool 7.

The core member 6 can be, for example, in the shape of a cylindrical body made of a conductive material with a flange 6a attached to the end, as shown in FIG. On the other hand, it is preferable that the crimping tool 7 has a cylindrical shape, for example, as shown in FIG. 4, and has a bent portion 7a formed in advance. At the end of the cable 5, the center conductor 3 and the braided wire 1 are exposed in advance as shown in FIG. 5, and the braided wire 1 is pushed out and the core member 6 is inserted inside the braided wire 1. A ground conductor 8 is bent into a U-shape and inserted into the crimping tool 7 in advance, and the crimping tool 7 is placed over the braided wire 1 in this state. The bent portion 7a of the crimping tool 7 is crushed using a tool, and the crimping tool 7 is crimped onto the core member 6 via the braided wire 1.

By attaching the ground conductor 8 to the braided wire 1 with the crimping tool 7 in this way, the ground conductor 8
is in electrical contact with the braided wire 1 and is also strongly supported mechanically.

Therefore, by soldering this ground conductor 8 to the printed circuit board 2 as shown in FIG.
The terminals of are securely clamped to the printed board 2. In particular, even if heat is transferred to the ground conductor 8 when the ground conductor 8 is soldered, the bond between the ground conductor 8 and the cable 5 will not loosen. Therefore, after the ground conductor 8 is soldered to the printed board 2, the clamping state of the cable 5 will not loosen, and the cable 5 will be clamped to the printed board 2 without play, so the soldering of the core wire 3 will not loosen. No bending force is applied to the attached portion, and the core wire 3 will not break. Furthermore, since the ground conductor 8 is soldered to the printed board 2 at a position close to where it is pressed against the peripheral surface of the braided wire 1 by the crimping tool 7, a strong supporting force can be obtained. Therefore, even if a relatively large force is applied to the cable 5, there is no risk of the ground conductor 8 breaking.
A highly reliable shielded wire terminal structure can be obtained.

In the above description, an example has been described in which the ground conductor 8 is formed of a wire material such as a plated wire, but the ground conductor 8 may be formed integrally with the crimping tool 7 as shown in FIG. 7, for example. Also, the flange portion 6a of the core member 6
It can also be formed integrally.

As explained above, according to this invention, the terminal of the cable 5 is clamped to the printed board 2 by soldering the ground conductor 8 to the printed board 2, and the braided wire 1 is connected to the ground conductor of the printed board 2. Both of these can be done at once, and wiring work can be done easily. Furthermore, since the ground conductor 8 is soldered to the printed board 2 near the portion held down by the crimping tool 7, its strength can be maintained strong. Therefore, the terminal of the cable 5 can be firmly clamped, and a highly reliable terminal structure of the shielded wire can be obtained without causing a disconnection accident in the core wire 3.

[Brief explanation of the drawing]

Fig. 1 is a perspective view for explaining the terminal structure of a conventional shielded wire, Fig. 2 is a sectional view showing an embodiment of this invention, and Fig. 3 is an example of a core member used in the terminal structure of this invention. Figure 4 is a perspective view showing an example of the crimping tool and ground conductor used in the terminal structure of this invention, and Figure 5 shows the state of the terminal of the shielded cable before the terminal structure of this invention is installed. 6 is a sectional view for explaining the state in which the terminal structure of this invention is mounted on a printed board,
FIG. 7 is a perspective view showing another embodiment of this invention. 1: braided wire, 2: printed board, 3: cable core wire, 5: cable, 6: core member, 7: crimping tool,
8: Grounding conductor.

Claims (1)

[Claims for Utility Model Registration] Coaxially inserted between the exposed part of the braided wire formed at the end of the shielded wire and the insulating layer inside thereof,
A cylindrical core member made of a metal material from which the core wire of the shield wire protrudes; and a tube that coaxially covers the exposed portion of the braided wire and tightens the exposed portion of the braided wire toward the core member. A shielded wire terminal structure comprising a cylindrical crimping tool, and a grounding conductor supported by and electrically connected to the cylindrical crimping tool and protruding outward in a radial direction with respect to the shielded wire.