JPH10284871A - Electromagnetic shielding material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a shielding effect of electromagnetic shielding material. SOLUTION: An electromagnetic shielding material 100 has an electromagnetic shielding sheet 110 made by stacking a conductive layer 111 and an insulating layer 112 and disconnectable sections 120, 121 which, being formed at one end and the other end of the electromagnetic shield sheet 110 respectively, can be connected to or disconnected from each other. When the disconnectable sections 120, 121 are formed on one face and the other face of the sheet 110 respectively, the electromagnetic shielding material 100 can be so deformed that the conductive layer 111 may come inside. In such an electromagnetic shield material, a projecting bent contact section 111a is formed in parallel with the disconnectable section 120, 121 by overlapping parts of the electromagnetic shielding sheet 110. In the bent contact section 111a, part of the conductive layer 111 at one end of the electromagnetic shielding sheet 110 and part of the conductive layer 111 at the other end of the sheet 110 can be brought into contact with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is to cover a shielded material such as an electric wire or a signal line to prevent external electromagnetic waves from entering the shielded material, and / or
The present invention relates to an electromagnetic wave shielding material for preventing electromagnetic waves generated from a shielded material from leaking outside.

[0002]

2. Description of the Related Art Conventional electromagnetic wave shielding materials are disclosed in
As disclosed in JP-A-66583, one end of a conductive sheet formed by laminating a conductive layer having conductivity and an insulating layer having insulating property is folded back so that the conductive layer is on the outside, and is contacted. In some cases, a notch having a predetermined depth is formed at predetermined intervals in a contact portion, and a hook-and-loop fastener for fixing the conductive sheet in a cylindrical shape is provided. When this electromagnetic wave shielding material covers an electric wire or the like, the contact portion and the conductive layer come into contact with each other, so that the electric wire or the like is electromagnetically covered without any gap, and attempts to prevent intrusion and / or leakage of the electromagnetic wave.

[0003]

However, this conventional electromagnetic wave shielding material cannot prevent invasion and / or leakage of electromagnetic waves unless the material to be shielded (such as an electric wire) is physically covered with no gap. In other words, since this conventional electromagnetic wave shielding material is structurally used by simply winding a conductive sheet into a roll and deforming it into a cylindrical shape, there is little gap in the overlapping portion of the rolled conductive sheet. If this is possible, however, electromagnetic waves will enter or / and leak from it. And, in practice, regardless of whether the material to be shielded is one or many, even if it is intended to wind the electromagnetic wave shielding material tightly around the entire material to be shielded, It cannot be placed inside the shield material without gaps. Therefore, a gap is formed in the overlapping portion of the conductive sheet, and electromagnetic wave intrusion and / or leakage occurs therefrom. Also, if the overall thickness of the shielded material is smaller than the inner diameter of the electromagnetic wave shielding material formed in a cylindrical shape, the electromagnetic wave shielding material loosens,
A larger gap is generated in the overlapping portion of the electromagnetic wave shielding sheet, and the penetration or leakage of the electromagnetic wave from the joint portion of the hook-and-loop fastener is further increased.

SUMMARY OF THE INVENTION An object of the present invention is to reliably perform electromagnetic wave shielding on a shielded material, especially when the overall thickness of the shielded material is smaller than the inner diameter when the electromagnetic wave shielding material is assembled. An object of the present invention is to provide an electromagnetic wave shielding material that can reliably shield electromagnetic waves.

[0005]

In order to solve the above problems, an electromagnetic wave shielding material according to the present invention comprises an electromagnetic wave shielding sheet comprising a conductive layer having conductivity and an insulating layer having insulation properties. An electromagnetic wave shield sheet is provided with an attachable / detachable portion which is provided at one end side and at least any part of the other end side excluding the one end side and is detachable from each other,
When the one end side and the other end side of the electromagnetic wave shielding sheet are attached to the attaching / detaching portion, the electromagnetic wave shielding material is deformable so that the conductive layer is on the inside, and the conductive layer of the electromagnetic wave shielding sheet is On the side, parallel to the detachable part,
A bent contact portion in which a part of the electromagnetic wave shield sheet is overlapped and protruded is formed, and the bent contact portion is a conductive layer on one end side of the electromagnetic wave shield sheet, and the other end side of the electromagnetic wave shield sheet. To the surface of the conductive layer.

According to this configuration, the distal end of the conductive layer at one end of the electromagnetic wave shielding sheet is inserted into the base end of the projecting bent contact portion. Therefore, the route through which the electromagnetic wave may enter or / and leak is formed in a substantially hairpin shape (in cross-section). In addition, since the periphery of the route formed in a substantially hairpin shape is a portion of the conductive layer of the electromagnetic wave shielding sheet, the electromagnetic wave is efficiently attenuated by absorption loss and reflection loss while passing through this route, so that the electromagnetic wave passes. It is difficult to do. Further, since the conductive layer on one end side of the electromagnetic wave shielding sheet and the conductive layer on the other end side of the electromagnetic wave shielding sheet are in surface contact with each other in a bent contact portion, an electrically closed circuit is formed, and electromagnetic waves are cut off. You.

Further, the electromagnetic wave shielding material of the present invention is characterized in that at least the conductive layer on one end side of the electromagnetic wave shielding sheet and / or the conductive layer on the one end side connected to the bent contact portion has at least one surface. Elastic conductive portions in which an inner material having elasticity is covered with a conductive material may be provided by lamination.

[0008] With this configuration, the elastic conductive portion, which covers the at least elastic inner member with the conductive material, protrudes around the route formed in a substantially hairpin shape so as to reduce the width of the route. It takes shape. Therefore, the number of times of reflection of the electromagnetic wave passing through this route increases, so that the electromagnetic wave can be more reliably attenuated by absorption loss and reflection loss. Also, an elastic conductive portion which is a bent contact portion and is covered with a conductive material provided on the surface of the conductive layer at one end of the electromagnetic wave shielding sheet, and a conductive material at the other end of the electromagnetic wave shielding sheet. Since the layers are brought into surface contact, an electrically closed circuit is formed, and electromagnetic waves are cut off. Therefore, intrusion and / or leakage of electromagnetic waves can be prevented more reliably.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electromagnetic shielding material according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1A is an exploded perspective view showing an electromagnetic wave shielding material according to the first embodiment of the present invention, and FIG. 1B is an electromagnetic wave shielding material according to the first embodiment of the present invention. It is sectional drawing which shows the state covered with.

An electromagnetic wave shielding material 100 according to a first embodiment of the present invention includes a rectangular electromagnetic wave shielding sheet 110 formed by laminating a conductive layer 111 having conductivity and an insulating layer 112 having insulating properties. Electromagnetic wave shield sheet 11
0 is provided on one end side and near the other end side opposite thereto, and is a hook-and-loop fastener 12 as a detachable portion which is detachable from each other.
0, 121, a surface fastener fixing sheet 126 for fixing the surface fastener 120 to one end of the electromagnetic wave shielding sheet 110, and an earth wire 150.

On the conductive layer 111 side of the electromagnetic wave shielding sheet 110, a bent contact portion 111a is formed in which a part of the electromagnetic wave shielding sheet 110 is overlapped and projected. The bent contact portion 111a is
0 and 121 are formed in parallel. The base end side of the bent contact portion 111a is fixed at the position 113 using a fixing means such as an insulating adhesive or a double-sided tape. From the fixed portion to the tip side of the bent contact portion 111a, the electromagnetic wave shielding sheet 110 is formed to have a shape in which the superposition of the electromagnetic shielding sheet 110 is flattened in sectional view Ω (hereinafter, referred to as “substantially flat Ω shape”).

The hook-and-loop fastener fixing sheet 126 is a rectangular insulating sheet having a width larger than the width direction of the hook-and-loop fastener 120. The hook-and-loop fastener 120 is fixed to one end of the hook-and-loop fastener fixing sheet 126 by a fixing means such as an adhesive or a double-sided tape. After fixing, the hook-and-loop fastener 120
Is the fixed surface side, and the surface fastener fixing sheet 12
6 (the surface fastener 12) on the other end side opposite to the one end section.
0 is not fixed) and the portion of the insulating layer 112 on the one end side of the electromagnetic wave shielding sheet 110 is fixed by fixing means such as heat-pressing or insulating adhesive or double-sided tape. That is, the hook-and-loop fastener 120 is
Is fixed to the electromagnetic wave shielding sheet 110 such that the upper surface of the surface fastener is on the side of the conductive layer 111 and the longitudinal direction of the surface fastener 120 is parallel to the edge on one end side of the electromagnetic wave shielding sheet 110.

The other surface fastener 121 deforms the electromagnetic wave shielding material 100 so that the conductive layer 111 is on the inner side, and makes the front end portion of the other side of the electromagnetic wave shielding sheet 110 the electromagnetic wave shielding material of the bent contact portion 111a. 100
The hook-and-loop fastener 121 is located at the base end on one end side of the
And the hook-and-loop fastener 120 are fixed at a position where they contact each other. The hook-and-loop fastener 121 is fixed so that the longitudinal direction is parallel to the edge on the other end side of the electromagnetic wave shielding sheet 110. The fixing of the surface fastener 121 is performed using a fixing means 114 such as an insulating adhesive or a double-sided tape on the insulating layer 112 near the other end of the electromagnetic wave shielding sheet 110.

The ground wire 150 is stitched and fixed along the other end of the electromagnetic wave shielding sheet 110 with a thread. However, the end on the other end side of the electromagnetic wave shielding sheet 110 is bent so that the conductive layer 111 is on the outside, and the base end of the overlapping portion is sewn with a thread to provide the installation portion 115 for the ground wire 150 in advance. ing. And the ground wire 150
Is stitched and fixed to a portion where a part of the conductive layer 111 is bent toward the insulating layer 112. In addition, the installation part 115 performs the suturing so that an internal space such as a loop shape in a sectional view is formed even after the earth wire 150 is sewn and fixed.

The manner in which the shielded material 200 is shielded by the electromagnetic wave shielding material 100 configured as described above will be described.

First, in FIG. 1A, the electromagnetic wave shielding material 100 should shield the conductive layer 111 of the electromagnetic wave shielding sheet 110 on the left conductive layer 111L on the left side of the bent contact portion 111a. The shielded material 200 is placed. Next, the ground wire 150 side provided on the left end of the electromagnetic wave shielding material 100 is connected to the bent contact portion 111a.
The ground wire 1 is connected to the right side of the conductive layer 111R, which is the right side of the conductive layer 111, and to the base end of the bent contact portion 111a.
It is positioned so that the tip on the 50 side is in contact. next,
When the hook-and-loop fastener 120 and the hook-and-loop fastener 121 are attached to each other, the state shown in FIG.

In this state, the shielded material 200 is completely completely wrapped in the electromagnetic wave shielding material 100. The shielded material 200 is completely surrounded by the conductive layer 111. Further, the portion formed by the right conductive layer 111R and the right side of the bent contact portion 111a has a substantially hairpin shape (in cross-sectional view) after the shielded material 200 is wrapped in the electromagnetic wave shielding material 100. Therefore, the entire thickness of the shielded material 200 is the same as the electromagnetic shielding material 10 after the electromagnetic wave shielding material 100 is wrapped in the shielded material 200.
In the case where the inner diameter is equal to 0, the substantially hairpin-shaped portions are in close contact with each other and are electrically connected. That is, the electromagnetic wave shielding member 100 has a closed circuit. Therefore, the shielded material 200 is completely electromagnetically sealed by the electromagnetic wave shielding material 100.

Also, when the overall thickness of the shielded material 200 is smaller than the inner diameter of the electromagnetic wave shield 100 after the electromagnetic wave shield 100 has been wrapped in the shielded material 200, the electromagnetic wave shield 100 may be loosened. Even in the state in which the electromagnetic wave is formed, the substantially hairpin-shaped portion functions to prevent intrusion and leakage of electromagnetic waves. In other words, although the substantially hairpin-shaped portion is not completely adhered, even if an attempt is made to cause penetration or leakage of electromagnetic waves through this substantially hairpin-shaped portion (root), Since the periphery of the portion (route) is covered with the conductive layer 111, the electromagnetic wave is efficiently attenuated by absorption loss and reflection loss while passing through this route.

The ground wire 150 is located on this substantially hairpin-shaped route. Further, the bent contact portion 111a formed in a substantially flat Ω shape and the installation portion 115 of the ground wire 150 formed in a substantially loop shape or the like are expanded on the substantially hairpin-shaped route to form a substantially hairpin-shaped route. Since it is positioned so as to reduce the width, it works to block the passage of electromagnetic waves. Therefore, the substantially hairpin-shaped portions are in contact with each other and are electrically connected. That is, the electromagnetic wave shielding member 100 has a closed circuit. Therefore, the shielded material 2
00 is electromagnetically sealed.

The electromagnetic wave shielding material 1 described above
Of the 00 components, the ground wire 150 can be omitted. The electromagnetic wave shielding sheet 110 is formed by bonding an aluminum foil to an insulating synthetic resin sheet, and in addition, one side of an insulating synthetic fiber fabric or the like is made conductive by metal coating or metal deposition. Or a composite thereof. Further, the bent contact portion 111a formed in a substantially flat Ω shape and the installation portion 115 of the ground wire 150 formed in a substantially loop shape or the like are mutually connected to each other by using a double-sided tape or an adhesive. You may adhere. However, in that case, it is desirable to insert an elastic inner material into the inner surface such that the bent contact portion 111a and the installation portion 115 have bulges.

The interconnection between the electromagnetic wave shielding sheet 110 and the hook-and-loop fasteners 120 and 121 or the ground wire 150 is merely an example, and other fixing means than described above may be used. The installation part 11 of the ground wire 150
5 and the method of forming the installation portion 115 are also merely examples, and any other method may be used. Further, an adhesive tape, a slide fastener, or the like may be used instead of the surface fasteners 120 and 121.

Next, an electromagnetic wave shielding material according to a second embodiment of the present invention will be described with reference to FIG. FIG. 2A is an exploded perspective view showing an electromagnetic wave shielding material according to a second embodiment of the present invention, and FIG. 2B is an electromagnetic wave shielding material according to a second embodiment of the present invention. It is sectional drawing which shows the state covered with.

The difference between the electromagnetic wave shielding material 101 according to the second embodiment of the present invention and the above-described electromagnetic wave shielding material 100 according to the first embodiment of the present invention is that urethane as an inner material having elasticity is used. Form 141 is formed of conductive cloth 142
The elastic conductive part 140 covered with the bent contact part 111a
Is provided by laminating from the right side surface to the right side conductive surface 111R.

Therefore, the manner in which the shielded material 200 is shielded by the electromagnetic wave shielding material 101 according to the second embodiment is basically the same. That is, the shielded material 20 to be shielded by the electromagnetic wave shielding material 101 is placed on the left conductive layer 111L of the electromagnetic wave shielding sheet 110.
Put 0. Next, with respect to the elastic conductive portion 140 provided by laminating the ground wire 150 side provided on the left end of the electromagnetic wave shielding material 101 to a portion formed by the right conductive layer 111R and the right portion of the bent contact portion 111a. Then, the end portion on the ground wire 150 side is positioned so as to contact the bent portion of the elastic conductive portion 140. Next, when the hook-and-loop fastener 120 and the hook-and-loop fastener 121 are attached to each other, the state shown in FIG.

In this state, the shielded material 200 is completely completely wrapped by the electromagnetic wave shielding material 101. The shielded material 200 is completely surrounded by the conductive layer 111. Furthermore, after the elastic conductive portion 140 wraps the shielded material 200 in the electromagnetic wave shielding material 101,
(Cross section view) It is almost hairpin-shaped. Therefore, the entire thickness of the shielded material 200 is
When the inside diameter of the electromagnetic wave shielding material 101 after the 1 is wrapped in the material to be shielded 200 coincides with each other, the substantially hairpin-shaped portions are brought into close contact with each other and are electrically connected. That is, the electromagnetic wave shielding material 101 has a closed circuit. Therefore,
The shielded material 200 is electromagnetically completely sealed by the electromagnetic wave shielding material 101.

Also, when the entire thickness of the shielded material 200 is smaller than the inner diameter of the electromagnetic wave shield 101 after the electromagnetic wave shield 101 is wrapped in the shielded material 200, the electromagnetic wave shield 101 is not loosened. Even in the state in which the electromagnetic wave is formed, the substantially hairpin-shaped portion functions to prevent intrusion and leakage of electromagnetic waves.

That is, although the substantially hairpin-shaped portion is not completely in close contact, even if an attempt is made to cause electromagnetic waves to enter or leak along this substantially hairpin-shaped portion (route), the substantially hairpin-shaped portion (root) is not substantially adhered. Since the periphery of the hairpin-shaped portion (route) is covered with the elastic conductive portion 140 and the conductive layer 111, the electromagnetic wave is efficiently attenuated by absorption loss and reflection loss while traveling along this route. Since the urethane foam 141 is contained in the elastic conductive part 140 as an inner material, the gap of this route is smaller than that of the electromagnetic wave shielding material 100 according to the first embodiment. Therefore, the number of times of reflection of the electromagnetic wave passing through this route increases, so that the electromagnetic wave can be more reliably attenuated by absorption loss and reflection loss. Therefore, the shielded material 200 is electromagnetically sealed by the electromagnetic wave shielding material 101 more reliably than in the case of the electromagnetic wave shielding material 100 according to the first embodiment.

The ground wire 150 is located on this substantially hairpin-shaped route. Therefore, the electromagnetic wave is also efficiently attenuated by the ground wire 150 due to absorption loss and reflection loss. Further, the bent contact portion 111a formed in a substantially flat Ω shape and the installation portion 115 of the ground wire 150 formed in a substantially loop shape or the like are expanded on the substantially hairpin-shaped route to form a substantially hairpin-shaped route. Since it is positioned so as to reduce the width, it works to block the passage of electromagnetic waves. Therefore, compared with the case of the electromagnetic wave shielding material 100 according to the first embodiment, the substantially hairpin-shaped portions are more reliably in contact with each other and are electrically connected (that is, the electromagnetic wave shielding material 100 is in a closed circuit). Has become). Therefore, the shielded material 200 is more reliably electromagnetically sealed by the electromagnetic wave shielding material 101.

[0029]

As described above, according to the first aspect of the present invention,
The electromagnetic wave shielding material according to the present invention, an electromagnetic wave shielding sheet obtained by laminating a conductive layer having conductivity and an insulating layer having insulating property, and at least one end of the electromagnetic wave shielding sheet and the other end excluding the one end. And a detachable portion which is provided on any one of the portions and which is detachable from each other. When one end and the other end of the electromagnetic wave shielding sheet are attached to the detachable portion, the conductive layer is located inside. A deformable electromagnetic wave shielding material, on the conductive layer side of the electromagnetic wave shielding sheet, a bent contact portion formed by overlapping a part of the electromagnetic wave shielding sheet and projecting in parallel with the attaching / detaching portion. The conductive layer on one end side of the electromagnetic wave shielding sheet, which is formed in the bent contact portion, is brought into contact with the surface of the conductive layer on the other end side of the electromagnetic wave shielding sheet.

According to this configuration, the distal end of the conductive layer at one end of the electromagnetic wave shielding sheet is inserted into the base end of the protruding bent contact portion. Therefore, the route through which the electromagnetic wave may enter or / and leak is formed in a substantially hairpin shape (in cross-section). In addition, since the periphery of the route formed in a substantially hairpin shape is a portion of the conductive layer of the electromagnetic wave shielding sheet, the electromagnetic wave is efficiently attenuated by absorption loss and reflection loss while passing through this route, so that the electromagnetic wave passes. It is difficult to do. Further, since the conductive layer on one end side of the electromagnetic wave shielding sheet and the conductive layer on the other end side of the electromagnetic wave shielding sheet are in surface contact with each other in a bent contact portion, an electrically closed circuit is formed, and electromagnetic waves are cut off. You. Therefore, even when the entire thickness of the shielded material is smaller than the inner diameter when the electromagnetic wave shielding material is assembled, the electromagnetic wave can be reliably shielded.

Further, the electromagnetic wave shielding material according to a second aspect of the present invention is the electromagnetic wave shielding material, wherein the bent-shaped contact portion has a conductive layer on one end side of the electromagnetic wave shielding sheet and / or a conductive layer on the one end side connected thereto. On the surface, at least an elastic conductive portion in which an inner material having elasticity was covered with a conductive material was laminated and provided.

According to this structure, the elastic conductive portion, which is formed by covering the at least elastic inner member with the conductive material, protrudes around the substantially hairpin-shaped route so as to reduce the width of the route. It takes shape. Therefore, the number of times of reflection of the electromagnetic wave passing through this route increases, so that the electromagnetic wave can be more reliably attenuated by absorption loss and reflection loss. Also, an elastic conductive portion which is a bent contact portion and is covered with a conductive material provided on the surface of the conductive layer at one end of the electromagnetic wave shielding sheet, and a conductive material at the other end of the electromagnetic wave shielding sheet. Since the layers are brought into surface contact, an electrically closed circuit is formed, and electromagnetic waves are cut off. Therefore, intrusion and / or leakage of the electromagnetic wave can be more reliably prevented.

[Brief description of the drawings]

FIG. 1A is an exploded perspective view showing an electromagnetic wave shielding material according to a first embodiment of the present invention, and FIG. 1B is an electromagnetic wave shielding material according to the first embodiment of the present invention; It is sectional drawing which shows the state covered with.

FIG. 2A is an exploded perspective view showing an electromagnetic wave shielding material according to a second embodiment of the present invention, and FIG. 2B is an electromagnetic wave shielding material according to a second embodiment of the present invention; It is sectional drawing which shows the state covered with.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 electromagnetic wave shielding material 110 electromagnetic wave shielding sheet 111 conductive layer 111 a bent contact portion 112 insulating layer 120 surface fastener (removable portion) 121 surface fastener (removable portion) 200 shielded material

Claims (2)

[Claims] 1. An electromagnetic shield sheet comprising a conductive layer having conductivity and an insulating layer having insulating property, and at least one of one end of the electromagnetic shield sheet and the other end excluding the one end. And an attachable / detachable portion which is provided on each of the electromagnetic shield sheets, and when the one end and the other end of the electromagnetic wave shielding sheet are attached to the attachable / detachable portion, the conductive layer is located inside. In the deformable electromagnetic wave shielding material, on the conductive layer side of the electromagnetic wave shielding sheet, a bent contact portion is formed in which a part of the electromagnetic wave shielding sheet is overlapped and projected in parallel with the attaching / detaching portion. A bent contact portion, wherein the conductive layer on one end of the electromagnetic wave shielding sheet can be brought into contact with the surface of the conductive layer on the other end of the electromagnetic wave shielding sheet. An electromagnetic wave shielding material. 2. The electromagnetic shielding material according to claim 1, wherein the conductive layer on the one end side of the electromagnetic shielding sheet and / or the conductive layer on the one end side which is continuous with the bent contact portion. An electromagnetic wave shielding material comprising: an elastic conductive portion in which at least an inner material having elasticity is covered with a conductive material.