JP2656893B2 - Electromagnetic wave shielding material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of protecting a shielded material from external electromagnetic waves by covering a shielded material such as an electric wire or a signal line with a conductive sheet, or preventing electromagnetic waves generated from the shielded material. The present invention relates to an electromagnetic shielding material for preventing leakage to the outside.

[0002]

2. Description of the Related Art Conventionally, as this kind of electromagnetic wave shielding material, for example, as disclosed in Japanese Utility Model Publication No. 28719/1990, when a material to be shielded is covered with a conductive sheet as an electromagnetic wave shielding material. In addition to connecting and closing both end portions of the conductive sheet, a conductive slide fastener was attached to the connection portion in order to secure the electrical continuity of the connected portion and prevent invasion and leakage of electromagnetic waves. Electromagnetic shielding materials are known.

[0003]

However, such a slide fastener cannot completely close the occlusal portion due to the structure of a fastener for stopping the fastener element, so that a gap is formed. In order to prevent electromagnetic waves from entering or leaking from gaps, there is a problem that some other method must be applied.

The inventor of the present invention has used a hook-and-loop fastener having a simple structure to connect both end portions of the conductive sheet, and has a predetermined width at the end of the conductive sheet positioned inside when closed with the hook-and-loop fastener. Provide a conductive contact portion having a, the contact portion, when closed by the hook-and-loop fastener, by contact with the conductive layer near the end of the conductive sheet located outside, between the two ends of the conductive sheet We considered a shield material that is electrically connected and electromagnetically covers the shielded material without any gaps.However, this shield material can be coated on wires that are arranged in a bent state, or this shield material can be coated on wires. If the conductive sheet is placed in a bent state, the conductive sheet in the bent part will be loose and a gap will be created between the contact part that electrically connects both ends of the conductive sheet and the conductive sheet. And the shielding effect is low There is a problem that to will is.

The present invention has been made to solve the above problems.
It is an object of the present invention to provide an electromagnetic wave shielding material having a simple structure, in which both ends of a conductive sheet are closed and electrically connected to each other to reliably prevent electromagnetic waves from entering and leaking.

[0006]

In order to achieve the above-mentioned object, according to the present invention, a shielded material such as an electric wire or a signal line is covered.
An electromagnetic wave shielding material to cover, a conductive sheet formed by laminating a conductive layer and an insulating layer, a surface of the conductive layer at an end of the conductive sheet, and a surface of the insulating layer at the other end of the conductive sheet. Are attached to each other, and a surface fastener that can be detached from each other, and at the end of the conductive sheet having the surface fastener attached to the surface of the insulating layer, at least facing the insulating layer side of the conductive sheet. The surface has conductivity, and the surface having conductivity extends a sheet-shaped contact portion having a predetermined width electrically connected to the conductive layer, and further has a predetermined interval at an edge of the contact portion. The invention further provides an electromagnetic wave shielding material characterized in that cuts are formed continuously.

[0007]

In the electromagnetic wave shielding material of the present invention configured as described above, the conductive sheet wound around the material to be shielded physically covers the material to be shielded and forms the conductive sheet. The conductive layer electromagnetically covers the shielded material.

The hook-and-loop fastener fixes both end portions of the conductive sheet so that the conductive sheet covering the shielded material is not opened. Further, the contact portion provided at one end of the conductive sheet, when covering the shielded material and fixing the conductive sheet in a tubular shape with a surface fastener, near the end portion on the side where the contact portion is not provided. By contacting the conductive layer with a predetermined width, both ends of the conductive sheet coated with the shielded material are electrically connected.

Therefore, when the electromagnetic wave shielding material of the present invention covers the material to be shielded, the periphery of the material to be shielded is covered with the conductive layer of the conductive sheet, and both ends of the conductive sheet are further contacted through the contact portions. By electrically connecting, the shielded material is electromagnetically covered without any gap, so that invasion and leakage of electromagnetic waves can be reliably prevented.

Further, according to the electromagnetic wave shielding material of the present invention,
When covering the bent shielded material or bending after covering the shielded material, the bent outer portion is required at the portion where the conductive sheets overlap (that is, the contact portion and the portion in contact with the contact portion). The part located at is pulled and the part located inside the bent is compressed, but the cut formed at the contact part opens,
Further, since the portions divided by the cuts overlap, the contact portion absorbs this expansion and contraction, and always maintains a good contact state between the contact portion and the conductive surface.

Therefore, even when the bent shielded material is covered, or the shielded material is covered and then bent, both ends of the conductive sheet are always connected in good condition via the contact portion. The shield effect is not reduced.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing the entire configuration of the electromagnetic wave shielding material of the present invention, and shows a state when the electromagnetic wave shielding material is not used and is not coated.

As shown in FIG. 1, the electromagnetic wave shielding material 2 of the present embodiment comprises a conductive sheet 4 having a conductive surface 4a on one side and an insulating surface 4b on the other side. . Then, at one end of the conductive sheet 4,
The contact portion 6 is formed by folding the conductive sheet 4 by a predetermined width so that the conductive surface 4a is on the outside, and a predetermined interval (for example, about 5 m)
m), a cut 8 having a predetermined depth (for example, about 5 mm) is made.

The boundary between the conductive surface 4a and the insulating surface 4b formed by the folding of the conductive sheet 4 and the end of the conductive sheet 4 which is not folded back are on the conductive surface 4a side. Fasteners 10a, 1 for fixing the electromagnetic wave shielding material 2 in a cylindrical shape with the conductive surface 4a inside.
0b is attached. In addition, the hook-and-loop fastener 10a,
10 b is sewn and fixed to the conductive sheet 4.

Here, the conductive sheet 4 may be a synthetic resin film made of polyvinyl chloride, polyolefin, polyester, polyamide, fluororesin, silicon resin, or the like, a synthetic fiber fabric made of the same material, or a composite material thereof. One side is made conductive by metal plating or metal deposition of aluminum, copper, nickel, and alloys thereof.

The electromagnetic wave shielding material 2 configured as described above
As shown in FIG. 2, after covering the shielded material such as the electric wire 20 with the conductive surface 4a of the conductive sheet 4 inside,
The conductive sheet 4 is used by being fixed in a cylindrical shape by the surface fasteners 10a and 10b. At this time, the ends of the conductive sheet 4 on the side where the contact portions 6 of the conductive sheet 4 are formed (hereinafter referred to as inside ends) are at the bottom, and the contact portions 6 are not formed. The end on the side (hereinafter, referred to as the outer end) overlaps with the upper side, and the conductive surface 4a of the contact portion 6 formed at the inner end contacts the conductive surface 4a near the outer end.

Accordingly, in the electromagnetic wave shielding member 2 of the present embodiment, the conductive surface 4a of the conductive sheet 4 covers the periphery of the shielded material, and the contact portions 6 electrically connect both ends of the conductive sheet 4. By connecting, the shielded material is covered electromagnetically without gaps, so that invasion and leakage of electromagnetic waves can be reliably prevented.

The bent electric wire 20 may be covered with the electromagnetic wave shielding material 2 or may be covered with the electromagnetic wave shielding material 2.
When the electric wire 20 covering the conductive sheet 4 is disposed by bending, the portion of the conductive sheet 4 where the outer end portion and the inner end portion of the conductive sheet 4 overlap with each other is pulled, and the portion of the conductive sheet 4 located outside the bent portion is pulled, Inside conductive sheet 4
Is compressed, but a cut 8 is formed in the contact portion 6 to absorb the expansion and contraction, so that the contact state between the contact portion 6 formed at the inner end and the conductive surface 4a near the outer end is good. That is, when the cut 8 is not formed,
Since the conductive sheet 4 cannot greatly expand and contract,
A gap is formed between the conductive sheet 4 that has been in contact with the outer end portion and the inner end portion due to the wrinkles caused by the portion of the conductive sheet 4 located on the inside that is bent and wrinkled. If a gap is formed between the inner end and the outer end of the conductive sheet 4 as described above, electromagnetic waves enter and leak from the gap, and the original shielding effect cannot be obtained.

However, since the notch 8 is formed, each notch 8 is opened when the contact portion 6 is pulled, and the portions divided by the notch 8 overlap when the contact portion 6 is compressed, so that the electromagnetic wave shield is formed. Since the expansion and contraction applied to the contact portion 6 when the material 2 is bent is absorbed, the conductive sheet 4 is not loosened, and therefore, the contact portion 6 formed at the inner end portion and the outer end portion are not formed. The state of contact with the conductive surface 4a in the vicinity of the portion is kept good.

As described above, according to the electromagnetic wave shielding material 2 of the present embodiment, when the material to be shielded such as the electric wire 20 is covered, the contact portion 6 formed at one end of the conductive sheet 4 becomes conductive. By contacting and electrically connecting the conductive surface 4a at the other end of the conductive sheet 4, the material to be shielded is electromagnetically covered without any gap, so that the surface fastener 10
Electromagnetic waves can be reliably prevented from entering and leaking from gaps where the a and b are attached.

Further, in the electromagnetic wave shielding material 2 of the present embodiment, the notch 8 formed in the contact portion 6 where the conductive sheet 4 overlaps when the material to be shielded is covered.
Prevents the conductive sheet 4 from being loosened when the electromagnetic wave shielding material 2 is bent, and improves the contact state between the contact portion 6 formed at the inner end and the conductive surface 4a near the outer end. Therefore, even if the electromagnetic wave shielding material 2 is used in a bent state, the shielding effect does not decrease.

Further, according to the electromagnetic wave shielding material 2 of the present embodiment, the contact portions 6 for ensuring the electrical continuity at both ends when the conductive sheet 4 is formed into a cylindrical shape, the conductive sheet 4 Since it is formed by folding back so that the conductive surface 4a is on the outside, manufacture is extremely easy.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can take various forms without departing from the gist of the present invention. For example, in the present embodiment, the conductive sheet 4 is made of a synthetic resin film, a woven fabric of synthetic fibers, or a composite material of which has one side made conductive by metal plating or metal deposition.
A metal foil made of copper, nickel, an alloy thereof, or the like may be bonded to a synthetic resin film or a synthetic fiber fabric.

In this embodiment, the hook-and-loop fastener 10 is used.
A and 10b are sewn and attached to the conductive sheet 4. The so-called ultrasonic bonding, which applies ultrasonic waves and high-frequency waves to a bonding portion formed of a thermoplastic resin, generates heat, and melts and bonds them, is used. It may be attached or attached using a normal adhesive.

Further, in this embodiment, the cut 8
Are formed at the same depth and at the same interval, but may be formed at any interval and depth within an appropriate interval or at an appropriate depth or more. For example, the direction of the cut 8 may be inclined with respect to the edge, the cut may be formed in a wave shape, or the cut may be formed so as to resemble a fold formed naturally during use.

In this embodiment, the contact portion 6 is formed by folding one end of the conductive sheet 4, but the contact portion may be formed by using a conductive sheet comprising only a conductive layer.
A conductive sheet having a predetermined width in which the conductive layer and the insulating layer are turned upside down, that is, the conductive layer and the insulating layer may be added to the end of the conductive sheet.

As shown in FIG. 3, a ground wire 11 in which a metal wire is braided may be attached to the conductive surface 4a.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating an overall configuration of an electromagnetic wave shielding material of the present embodiment.

FIG. 2 is an explanatory diagram illustrating a use state of the electromagnetic wave shielding material of the present embodiment.

FIG. 3 is an explanatory diagram showing an overall configuration when an earth wire is attached to the electromagnetic wave shielding material of the present embodiment.

[Explanation of symbols]

2: Electromagnetic wave shielding material 4: Conductive sheet 6: Contact portion 8: Cut 10a, 10b: Surface fastener 11: Ground wire
20 ... Electric wire

Claims (1)

(57) [Claims] 1. A shielded material such as an electric wire or a signal line is covered.
A conductive sheet formed by laminating a conductive layer and an insulating layer; a conductive layer surface at an end of the conductive sheet; and an insulating layer surface at the other end of the conductive sheet. Surface fasteners attached and detachable from each other, and a surface facing at least an insulating layer side of the conductive sheet at an end of the conductive sheet having the surface fastener attached to the surface of the insulating layer. Has a conductive property, and the conductive surface extends a sheet-shaped contact portion having a predetermined width electrically connected to the conductive layer. Further, a predetermined interval is provided at an edge of the contact portion. An electromagnetic wave shielding material characterized in that cuts are continuously formed in the electromagnetic wave shielding material.