JPH0628941U - Shield tube - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the shielding property of the shield tube that focuses electric wires and shields the influence of electromagnetic waves. [Structure] Outer insulator 2 and inner insulator 3 wound in an annular shape
A conductive hot melt material 4 is interposed between the outer insulator and the inner insulator, and cut-out step portions 5a and 5b exposing the conductive hot melt material are formed at opposite ends of the outer insulator and the inner insulator. The step portions are polymerized with each other and fixed by the melting of the conductive hot melt material.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shield tube capable of focusing electric wires and shielding the influence of electromagnetic waves.

[0002]

[Prior art]

 FIG. 4 shows a shield tube described in Japanese Utility Model Publication No. 56-158627. The shield tube 10 has a state in which the shielding metal foil 12 is continuously adhered to the inner side surface and the outer side surface of one end of the flexible insulating resin plate 11 and the insulating resin plate 11 is rolled into a cylindrical shape. Then, the locking arm 13 provided at the other end of the insulating resin plate 11 and the socket 14 provided at the one end are connected to each other to form the outer shield foil 12a at the one end and the inner shield foil at the other end. 12b is contacted. The inner shield foil 12b is connected to the ground drain wire 15 provided on the outer surface of the other end of the insulating resin plate 11 to remove the influence of noise or the like.

However, the above-mentioned conventional structure has a problem that the structure becomes complicated because the locking arm 13 and the socket 14 are integrally provided on the insulating resin plate 11. Further, since the outer shield foil 12a and the inner shield foil 12b are brought into contact with each other by the engagement of the locking arm 13 and the socket 14, there is a drawback that a contact failure is likely to occur.

[0004]

[Problems to be solved by the device]

 The present invention has been made in view of the above points, and an object of the present invention is to provide a shield tube having a simple structure, good contact, and high shieldability.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention has a conductive hot melt material interposed between an outer insulator and an inner insulator that are wound in an annular shape, and the outer insulator and the inner insulator face each other. A structure is adopted in which a notched step portion exposing the conductive hot melt material is formed at an end, and the notched step portions are polymerized with each other and fixed by melting the conductive hot melt material.

[0006]

[Action]

 By overlapping the cut-out steps and heating the conductive hot-melt material, the melted conductive hot-melt material firmly fixes the cut-out steps and forms an annular shield.

[0007]

【Example】

 FIG. 1 is a front view of a shield tube according to an embodiment of the present invention in a non-connected state, and FIG. 2 is a front view of the same connected state. In the shield tube 1, a conductive hot melt material (adhesive material) 4 is interposed between a flexible outer insulator 2 and an inner insulator 3 which are wound in an annular shape, and the outer insulator 2 and Notch step portions 5a, 5b are formed at opposite ends of the inner insulator 3 so that the connection portions 4a, 4b of the conductive hot melt material 4 are exposed so as to face each other. The notch step portions 5a, 5b are formed. 5b are polymerized with each other so that the conductive hot melt material 4 can be fixed by melting.

That is, as shown in FIG. 3, the flexible outer insulator 2 and inner flexible insulator 3 are initially formed in a plate shape, and a conductive hot melt material 4 is disposed between them. The outer insulator 2 and the inner insulator 3 are displaced from each other in the longitudinal direction so as to form notch step portions 5a and 5b exposing the connection portions 4a and 4b of the conductive hot melt material 4 at both ends. ing.

Further, metal foils 6 and 6 are attached between the outer insulator 2 and the conductive hot melt material 4 and between the inner insulator 3 and the conductive hot melt material 4. Further, inside the outer insulator 2, a grounding drain wire 7 that comes into contact with the metal foil 6 is provided. The metal foils 6 and 6 are for further enhancing the shielding effect, and the conductive hot melt material 4 alone exhibits sufficient shielding properties.

The conductive hot melt material 4 is a cellulosic adhesive or an acrylic monomer adhesive to which carbon is added to have conductivity, and examples thereof include polyolefin, ethylene / vinyl acetate copolymer resin, and diene. -A heat-melting resin such as a styrene copolymer resin is used as a base, and if necessary, additives such as a tackifier, a plasticizer, and an antiaging agent are mixed therein, and more preferably a diameter of 1.0 μm or less and a long length. A carbon fiber having a thickness of 50 μm or less is preferably mixed and dispersed in an amount of 10 to 200 parts by weight (see Japanese Patent Application No. 4-12038).

Then, the initial shape body 1 ′ shown in FIG. 3 is rolled into an annular shape to obtain the shield tube 1 having a shape in which the notched step portions 5 a and 5 b shown in FIG. The notched step portions 5a and 5b have contact portions 4a and 4b of the conductive hot melt material 4 facing each other. The conductive hot melt material 4 is melted by a heating means such as a hot air dryer and adhered to the outer insulator 2 and the inner insulator 3 (more precisely, to the metal foils 6 and 6 of both insulators 2 and 3). At the same time, the connecting portions 4a and 4b in the cutout step portions 5a and 5b are fused to each other and integrated into an annular shape. As a result, as shown in FIG. 2, a shield 4'without a joint (contact portion) is formed, and a high electric shielding property is exhibited.

[0012]

[Effect of device]

 As described above, according to the present invention, the connection of the outer and inner insulators and the connection of the shield connection portion are simultaneously performed by the fusion of the conductive hot melt material, and the conventional connecting procedure is not necessary. It becomes compact and the shield is improved by forming an integral shield.

[Brief description of drawings]

FIG. 1 is a front view of a shield tube according to an embodiment of the present invention in a non-connected state.

FIG. 2 is a front view of the same connection state.

FIG. 3 is a perspective view showing an initial shape of the shield tube.

FIG. 4 is a front view showing a conventional example.

[Explanation of symbols]

 2 Outer insulator 3 Inner insulator 4 Conductive hot melt material 5a, 5b Notch step

Claims (1)

[Scope of utility model registration request] 1. A conductive hot melt material is interposed between an outer insulator and an inner insulator which are wound in an annular shape, and the conductive material is provided at opposite ends of the outer insulator and the inner insulator. A shield tube, characterized in that a notched step portion exposing a hot melt material is formed, and the notched step portions are mutually polymerized and fixed by melting of the conductive hot melt material.