JPH04297096A - Electromagnetic shielding cover structure for cable lead-in opening - Google Patents

Abstract

PURPOSE:To provide a structure having good characteristics in electromagnetic shield, together with advantages in reliability and cost, for an electromagnetic shielding cover of a cable lead-in opening. CONSTITUTION:A cylindrical shape of conductive cloth is constituted of a piece of wire cloth 1 made of braided metal wire 9 in fine meshes and a piece of insulating cloth 2 covering the wire cloth 1. At the one end, the cylindrical shape of conductive cloth is fixed to a surrounding edge of a wire lead-in opening on a panel 10. At the other end, the cylindrical shape of conductive cloth has a binding band 7 for binding a bundle of cables thereon.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable inlet electromagnetic shielding cover structure for a cable inlet of an electronic equipment cabinet.

0002

[Background Art] In recent years, electronic computers, communication devices, etc. have become digital and faster, and as these have become widespread, electromagnetic interference waves radiated from the devices into the surrounding space have become a problem. . For this reason, electronic devices are electromagnetically shielded by housing them in cabinets made of metal or conductive plastic. The cabinet is provided with a cable inlet for introducing cables, but in order to obtain good shielding performance as a whole of the cabinet, it is necessary to make the gap between the cable inlets as small as possible. As a countermeasure against this problem, a structure is used in which the cable inlet is closed with conductive cloth.

FIG. 3 shows a perspective view of a conventional general cable inlet electromagnetic shield cover structure.

A cable introduction port 12 for introducing a cable bundle 11 into the cabinet is provided in a panel 10 provided on the top, bottom, or side surface of the cabinet. The cable bundle 11 consists of signal cables, power cables, etc. between devices. Since a connector is normally attached to each cable end in advance, the cable introduction port 12 is made considerably wider than the outer circumference of the cable bundle 11 so that the cable introduction can be carried out smoothly. As a result,
A large gap is created around the cable bundle 11 of the cable introduction port 12. Therefore, in order to prevent electromagnetic waves from leaking through this gap, a cylindrical conductive cloth 13 is attached to the cable introduction port 12. One end of the conductive cloth 13 is fixed to the panel 10 by a pressing plate 14, and the conductive cloth 13 and the panel 10 are in electrical contact. A wrapping band 15 is attached to the other end of the conductive cloth 13, so that the cable bundle 11 is secured to the conductive cloth 1 after the cable is introduced.
It is bound together with 3. As a result, cable inlet 12
will be electromagnetically shielded. Conductive cloth 1
3 may be mounted toward the outside of the cabinet or toward the inside of the cabinet.

[0005] The conductive cloth 13 is made of woven metal wire or the like. In this case, since the surface of the conductive cloth 13 is conductive, when the conductive cloth 13 is mounted toward the outside of the cabinet, it comes into contact with surrounding metal structures such as a device mounting stand, and the conductive cloth 13 13, when it is mounted toward the inside of the cabinet, there is a risk that it will come into contact with the power supply terminal inside the device, and the grounding system of the device may be disturbed or the power supply system may be short-circuited.

[0006] Figures 4 and 5 show conventional conductive fabrics that eliminate the above-mentioned drawbacks. All of these are configured to shield the interference waves directly radiated from the cable by covering the cable bundle, but are not configured to shield the cable inlet. However, by suturing these into a cylindrical shape as shown in Figure 3,
It is clear that by attaching the wrapping band 15, it can also be configured as a cable inlet shield cover structure. Therefore, the following describes the problems that occur when a cable inlet shield device is constructed using these conventional conductive cloths.

[0007]

[Problems to be Solved by the Invention] The conductive cloth shown in FIG. 4 is made by overlapping an aluminum foil 21 with an insulating cloth 22. The wire mesh line 23 arranged along one end is sewn together with the aluminum foil 21 and the insulating cloth 22 to form a strong stitched part, and is rolled into a cylindrical shape with the aluminum foil 21 inside. This is for sometimes electrically contacting the other end of the aluminum foil 21. Because of this structure, if you try to use it for the cable inlet shield cover structure shown in Figure 3, first of all, the surface of the aluminum foil 21 tends to form an oxidized insulating film. The joints between the aluminum foils 21 and the aluminum foils 21 and the panel 10 are not electrically contacted, and only a weak shielding performance can be obtained. When a wire mesh line 23 as shown in Fig. 4 is attached to these joints, the mesh is attached to the aluminum foil 21.
Although a part of the insulating film on the surface is destroyed and electrical contact is made, the contact is not stable, and the addition of such members and the complicated processing impair economic efficiency. In addition, aluminum foil itself has poor shape recovery properties, so
In a three-dimensional structure such as a cable inlet shield cover structure, repeated wrapping and unwrapping at the wrapping portion in particular causes wrinkles and cracks in the aluminum foil, impairing cable introduction performance and shielding performance.

The conductive cloth of FIG. 5 is similar to the conductive cloth of FIG. 4, except that wire mesh 24 is used as the conductor. The wire mesh 24 is made by knitting metal wires 25 as shown in FIG. 6, and is also widely used as a shield gasket material. metal wire 25
Generally, the wire diameter is about 0.1 mm, the mesh size is about 1 to 2 mm, and the opening ratio is large, and it is highly elastic. In addition to aluminum, the metal wire 25 may be made of stainless steel,
Monel, nickel, etc. are used. If such a conductive cloth is used in the cable inlet shield cover structure shown in FIG. 3, the stitches will be coarse and the ends will need to be formed because they expand and contract, and the seams between the wire meshes 24 and the wire mesh It was necessary to interpose a wire mesh line at the joint between 24 and panel 10, which was uneconomical. In addition, since the wire mesh 24 has poor shape recovery properties and tends to come loose at locations other than the seamed portion with the insulating cloth, it may block the cable inlet 12 and prevent the cable from being introduced smoothly, or if an attempt is made to prevent this, the wire mesh 24 may become loose. The wire mesh 24 and the insulating cloth had to be sewn together. Furthermore, since the weave is coarse, connectors, terminal protrusions, metal fittings, etc. attached to the end of the cable may get caught when the cable is introduced, impairing workability or damaging the wire mesh 24.

The object of the invention is to eliminate the above-mentioned drawbacks and to
It is an object of the present invention to provide a cable inlet electromagnetic shielding cover structure that has high electromagnetic shielding performance and is excellent in reliability and economical efficiency.

0010

[Means for Solving the Problems] In the cable inlet electromagnetic shield cover structure of the present invention, the conductive cloth is composed of a wire cloth made of finely woven metal wires, and an insulating cloth that covers the wire cloth.

[0011]

[Function] A wire cloth made of woven metal wires,
Since a conductive cloth comprising an insulating cloth covering the wire cloth is used, the cable can be introduced without causing electrical contact between the conductive cloth and the metal structures around the device or the electrical terminals inside the device. An electromagnetic shielding cover structure can be provided. In addition, since the wire cloth mentioned above is a cloth made of finely woven metal wires, the cable can be introduced smoothly without the protrusions of the connector getting caught in the weave.
In addition, since it is flexible and highly resilient, it is possible to provide an inexpensive cable inlet electromagnetic shielding cover structure that does not require additional members for forming.

[0012] By making the wire cloths from metal wires that do not readily undergo oxidation or corrosion, stable electrical contact can be obtained between the wire cloths and between the wire cloths and the panel.

[0013]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of a cable inlet electromagnetic shield cover structure according to an embodiment of the present invention.

The wire cloth 1 is formed into a cylindrical shape, and both ends thereof are sewn together at a seam portion 3. In the stitched portion 3, both ends of the wire cloth 1 overlap by about 1 to 2 cm so that the ends thereof are in sufficient electrical contact with each other. The insulating cloth 2 covers the wire cloth 1 and is sewn to the wire cloth 1 at a seam portion 4. The wire cloth 1 and the insulating cloth 2 constitute a conductive cloth. A suitable material for the insulating cloth 2 is flame-retardant vinylon or the like. The end 5 of the wire cloth 1 to be attached to the panel 10 is folded back so as to sandwich the lower end of the insulating cloth 2,
By fixing the holding plate 6 to the panel 10 using screws 8 or the like, the wire cloth 1 and the panel 10 are brought into sufficient electrical contact. One end of the encircling band 7 is sewn to one side of the insulating cloth 2. As the wrapping band 7, a hook-and-loop fastener with good wrapping workability is suitable.

FIG. 2 is a plan view showing the structure of the wire cloth 1.

The wire cloth 1 is made by weaving metal wires 9 in a plain weave manner. Twill weave may also be used. Wire cloth 1 is characterized by having small stitches. For example, a wire cloth using wire with a wire diameter of 0.1 mm has a high density of 100 mesh or more. Here, mesh is a unit representing the number of wires per inch. Further, although the wire cloth 1 has almost no elasticity, it is flexible and at the same time has a relatively good shape recovery property. In this way, the wire cloth 1 is completely different from the wire mesh 24 shown in FIG. 5 in terms of structure and properties. Further, the material of the metal wire 9 is preferably stainless steel, monel, nickel, etc., which are unlikely to be oxidized or corroded.

As shown in FIG. 1, the upper end of the conductive cloth is left open when the cable is introduced, and the upper end of the conductive cloth is wrapped with a wrapping band 7 after the cable is introduced, thereby leaving a gap around the cable bundle. It's completely blocked. Cable addition and removal are performed by once releasing the wrapping band 7 and opening the upper end of the conductive cloth again. In this way, the conductive cloth can be repeatedly closed and opened by simple operations.

Since the conductive cloth is constructed as described above, the conductive cloth and the panel 10 are brought into sufficient and stable electrical contact over a relatively large area by the pressing force exerted by the presser plates 6 on the four sides. In addition to this, the conductive cloth covers the cable bundle without any gaps, resulting in high shielding performance. Furthermore, since the surface of the conductive cloth is covered with the insulating cloth 2, electrical contact between the conductive cloth and metal structures around the device or electrical terminals inside the device is prevented. Since the wire cloth 1 is a cloth knitted with metal wires 9 that are not susceptible to oxidation, corrosion, etc., stable electrical contact between the wire cloths 1 and between the wire cloth 1 and the panel 10 can be obtained for a long period of time. Further, since the wire cloth 1 is a cloth made of finely woven metal wires 9, the cable can be introduced smoothly without the protrusions of the connector getting caught in the weave. In addition, since the wire cloth 1 is difficult to expand and contract, and is highly flexible and resilient, it can be separated from the insulating cloth 2 even when the insulating cloth 2 moves by simply sewing the upper end to the insulating cloth 2. There is no need to narrow the cable entry port and prevent cable introduction. In addition, since forming is easy due to these properties of the wire cloth 1,
There is no need to add another member for attachment to the panel 10. In addition, since wire cloth 1 is difficult to expand and contract,
It can be easily processed with high precision and has excellent manufacturability.

[0020]

[Effects of the Invention] As explained above, the present invention has the following effects. (1) The invention of claim 1 uses a conductive cloth comprising a wire cloth made of knitted metal wires and an insulating cloth covering the wire cloth, so there is a gap around the introduced cable. It is possible to provide an electromagnetic shielding cover structure for the cable inlet that prevents leakage of electromagnetic waves by eliminating electromagnetic waves and prevents electrical contact between the conductive cloth and the metal structures surrounding the device or the electrical terminals inside the device. ,Also,
Wire cloth is a cloth made of finely knitted metal wires, so the cable can be introduced smoothly without the protrusions of the connector getting caught in the weave, and it is flexible and resilient, so it can be used as an additional material for forming. Therefore, it is possible to provide an inexpensive cable inlet electromagnetic shielding cover structure that does not require additional cable inlet electromagnetic shielding. (2) In the invention of claim 2, since the wire cloth is a cloth knitted from metal wires that are not susceptible to oxidation or corrosion, stable electrical contact can be obtained between the wire cloths and between the wire cloth and the panel. .

[Brief explanation of drawings]

FIG. 1 is a perspective view of a cable inlet electromagnetic shield cover structure according to an embodiment of the present invention.

FIG. 2 is a plan view showing the structure of the wire cloth 1 in FIG. 1.

FIG. 3 is a perspective view of a conventional example of a cable inlet electromagnetic shield cover structure.

4 is a plan view for explaining the conductive cloth 4 in FIG. 3. FIG.

5 is a plan view for explaining the conductive cloth 4 in FIG. 3. FIG.

6 is a plan view illustrating a wire mesh 24 that constitutes the insulating cloth 22 of FIG. 5. FIG.

[Explanation of symbols]

1 Wire cloth 2 Insulating cloth 3 Sewing portion 4 Sewing portion 5 Attachment end portions 6, 14 Holding plates 7, 15 Confinement band 8 Screws 9, 25 Metal wire 10 Panel 11 Cable bundle 12 Cable introduction port 13 Conductive cloth 21 Aluminum Foil 22 Insulating cloth 23 Wire mesh line 24
wire mesh

Claims (2)

[Claims] Claim 1: A cylindrical conductive cloth, one end of which is fixed to the periphery of a cable inlet of an electronic device cabinet, and the other end of the conductive cloth is attached to wrap a cable bundle together with the conductive cloth. A cable introduction port electromagnetic shielding cover structure including a wrapping band, characterized in that the conductive cloth consists of a wire cloth made of finely woven metal wires and an insulating cloth covering the wire cloth. Mouth electromagnetic shield cover structure. 2. The cable inlet electromagnetic shield cover structure according to claim 1, wherein the wire cloth is made of a metal wire that is resistant to oxidation and corrosion.