JPH0538717U - Shielded wire - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a shielded wire that can be inserted into a pressure contact terminal in a balanced and even manner. An insulating wire core 3 for signals and a metal core wire 4 for grounding, which are made of polyethylene resin and are arranged in parallel and spaced from each other, are in direct contact with a shielding layer 5 made of a metal tape to be integrated. And an outer sheath 8 made of polyvinyl chloride resin is provided on the outer sheath 6 and the insulating wire core 3 and the earth-side outer sheath 6 covering the metal core wire 4 are formed to have substantially the same diameter. Moreover, the insulator 3 and the outer cover 8 have substantially the same hardness.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shielded wire that can be connected to a pressure contact terminal, and is used for internal wiring of electrical equipment such as telecommunications equipment.

[0002]

[Prior Art]

 Among the electric devices, the electric wires used for the internal wiring of audio devices such as radios, televisions, video devices, and video devices are required to have electrostatic shielding ability, and thus shielded wires are used.

Further, unlike a crimp terminal, as a means for connecting the end of the shielded wire to a device, a printed circuit, etc., it is not necessary to expose the core wire at the time of installation, and it is not necessary to connect to the connector after the installation, and the efficiency is remarkably improved. Pressure-contact terminals, which have advantages, are often used.

As a shielded wire that can be easily connected to this press-contact terminal, a shielded wire in which an insulating wire core for signals and a metal core wire for grounding, which are arranged in parallel at a distance from each other, are made of metal tape It is in direct contact with the layer, is wrapped in one piece, and is provided with an outer cover, and the insulating core and the earth-side outer cover covering the metal core are formed to have substantially the same diameter. The structure described above is disclosed in JP-A-58-1919.

However, since the signal insulating wire core to be inserted into each pressure contact terminal is required to have a low capacitance, polyethylene resin or the like is used as the insulator, and the signal insulating wire and the metal core wire are also used. For the economical part, a polyvinyl chloride resin, which has a different hardness from polyethylene resin, is used because the outer covering that covers and is not required to have the same low capacitance as the insulating core for signals.

Therefore, when the insulation core and the ground core are exposed by peeling off the outer cover of the connection end, and the core is attached to the pressure terminal, even if the shielded wire disclosed in the above publication is used. Even if the insulation core and the outer sheath that covers the ground core are formed to have the same diameter, they cannot be inserted into the pressure contact terminals evenly in a well-balanced manner, and there is a risk that they may be inserted at an angle and connection failure may occur. .

[0007]

[Problems to be solved by the device]

 The problem to be solved by the present invention is that a shielded wire that can be connected to a conventional pressure contact terminal cannot be inserted into the pressure contact terminal in a balanced manner, and there is a concern that it may be inserted at an angle and cause a connection failure. It is a point.

[0008]

[Means for Solving the Problems]

 According to the present invention, an insulating wire core for signals and a metal core wire for ground, which have polyethylene resin as an insulator and are arranged in parallel with each other with a space therebetween, directly contact with a shielding layer made of a metal tape and are integrally packaged. In a shielded wire that is rare and has a jacket made of polyvinyl chloride resin formed on it, the insulated core and the ground-side jacket that covers the metal core are formed to have approximately the same diameter. The insulating wire and the outer cover have substantially the same hardness, and an object of the present invention is to provide a shielded wire that can be uniformly and evenly inserted into a press contact terminal.

[0009]

[Action]

 By making the hardness of the polyethylene resin that constitutes the insulator of the insulated core to be inserted into the pressure contact terminals and the polyvinyl chloride resin that constitutes the outer sheath covering the metal core equal, respectively Make sure they are the same, and insert them into the pressure contact terminals evenly and in a balanced manner.

[0010]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show an embodiment of the present invention in which an insulating wire core 3 for a signal and a metal core wire 4 for a ground are connected to each other. The insulating cores 3 are arranged in parallel with a space therebetween, and an insulating wire 2 made of polyethylene resin is coated on a core wire 1 having a diameter substantially the same as that of the metal core wire 4.

In addition, the insulating wire core 3 and the metal core wire 4 are longitudinally packaged together with a laminated tape of a metal such as copper or aluminum and a synthetic resin such as polyester or a tape made of only metal. In addition to being integrally wrapped with the formed shielding layer 5, an outer cover 8 made of vinyl chloride resin is provided thereon.

[0012] Then, formed on the diameter D ₂ Togabo equal dimensions of the enveloping part 6 of the ground-side covering the diameter D ₁ and the metal core wire 4 of the insulating core wires 3.

The outer cover 8 made of vinyl chloride resin and the polyethylene resin forming the insulator 2 have the same hardness.

As means for making the insulator 2 and the jacket 8 to have substantially the same hardness, the polyethylene resin forming the insulator 2 is softened and the vinyl chloride resin forming the jacket 8 is hardened. However, considering the penetration into the connection terminal, it is preferable to soften the polyethylene resin forming the insulator 2. As means for softening the polyethylene resin, there are conventionally known means such as selection of polymerization conditions or forming into foam.

As shown in FIGS. 3 and 4, the shielded electric wire having such a structure is insulated by stripping only the outer sheath 7 on the signal side of the connection end or the shield layer 5 with an appropriate tool. A wire core 3 is exposed, and pressure contact terminals 9a and 9b are pierced and attached to each of the insulated wire core 3 and the metal core wire 4 which is still covered with the jacket portion 6 and connected to a predetermined location such as a printed circuit. The blades of the press contact terminals 9a and 9b contact the core wire 1 and the metal core wire 4.

At this time, in this embodiment, the diameter D ₁ of the insulating wire core 3 from which the jacket 7 is removed and the diameter D _{2 of the} ground-side jacket 6 that covers the metal core wire 4 are formed to be substantially equal. In addition, since the outer cover 8 and the insulator 2 have the same hardness, they can be evenly inserted into any of the press contact terminals 9a and 9b arranged at a predetermined interval without being inclined, and a connection failure can occur. There is no worry of goodness.

The present invention is not limited to the shielded electric wire having the single insulated wire core 3 for signals. For example, as shown in FIGS. 5 and 6, the insulated wire core 3 has two insulated wire cores 3. It is needless to say that the same can be applied to the shielded electric wires of more than that.

[0018]

[Effect of the device]

 According to the present invention, the diameter of the insulation core without the jacket is equal to the diameter of the jacket on the ground side covering the metal core, and in addition, the hardness of the jacket and the insulator is increased. Since the wires are formed equally, the insulated core and the metal core covered with the jacket can be inserted evenly into any of the pressure contact terminals arranged at a predetermined interval without tilting. The installation work can be done easily and surely, and there will be no connection failure.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a perspective view of an end portion showing a usage state of the embodiment shown in FIG.

4 is a cross-sectional view taken along the line BB of FIG.

FIG. 5 is a vertical cross-sectional view of another embodiment.

FIG. 6 is a vertical cross-sectional view of another embodiment.

[Explanation of symbols]

 3 ... Insulating wire core 4 ... Metal core wire 5 ... Shielding layer 6 ... Envelope part 8 ... Envelope

Claims (1)

[Scope of utility model registration request] 1. An insulating wire core for signals and a metal core wire for grounding, which are made of polyethylene resin as an insulator and are arranged in parallel with each other at a distance from each other, are brought into direct contact with a shielding layer made of a metal tape to be integrally formed. In a shielded wire which is wrapped and has an outer cover made of polyvinyl chloride resin provided thereon, the insulating wire core and the earth-side outer cover covering the metal core wire are formed to have substantially the same diameter. And a shielded wire in which the insulator and the outer cover have substantially the same hardness.