JPH1154980A - Electromagnetic wave shielding gasket and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic wave shielding gasket and a method for manufacturing it which is more simply manufactured at low cost than conventional manner, and employs a structure in which a conductive material of high electromagnetic wave shielding effect such as a metal foil, etc., hard to use hitherto is also used. SOLUTION: An electromagnetic shielding gasket 10 is provided with a flexible long elastic material part 100, a conductive part 200 which is fixed extending from at least one outer surface side of the elastic material part 100 to the outer surface side opposite to it, and a double-faced tape 300 acting as a fixing means attached to the outer surface of the conductive part 200. The elastic material part 100 has a bending part 110.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shielding gasket which is attached to an opening / closing portion of a door or the like in, for example, an anechoic chamber to block electromagnetic waves and a method of manufacturing the same.

[0002]

2. Description of the Related Art A conventional electromagnetic shielding gasket of this type will be described with reference to FIG. First, this type of electromagnetic wave shielding gasket is attached to, for example, an opening / closing unit such as a door in an anechoic chamber to block electromagnetic waves.

[0003] The electromagnetic wave shielding gasket shown in FIG. 10 is made of a flexible foam such as urethane, EPT, or silicone, or a highly stretchable soft material such as elastomer (hereinafter, referred to as "gasket").
An elastic body 900 (base portion of an electromagnetic wave shielding gasket) made of “foam or the like”;
The conductive cloth 910 includes a conductive cloth 910 having conductivity and a double-sided tape 920 as an attachment means attached to an outer surface of the conductive cloth 910.

The elastic member 900 is a long member having a certain length (for example, 1 m) having a substantially rectangular shape or an L-shape in cross section. The conductive member 910 is wrapped by bonding. Cover the outside. The double-sided tape 920 is attached to the back surface side of the electromagnetic wave shielding gasket, which is the overlapping portion of the conductive cloth 910. This double-sided tape 9
Reference numeral 20 is attached to, for example, a frame to which a door of an anechoic chamber is attached, and electromagnetically shields a gap between the door and the frame.

[0005]

However, when the elastic portion of the electromagnetic wave shielding gasket is made of a hard material, the elastic portion wound around a reel is wrapped with a conductive cloth while being pulled. Although the elastic member may be manufactured in such a manner, when the elastic member is formed of a foam material or the like which is a soft material, the elastic member cut into a certain length such as 1 m is wrapped with a conductive cloth. It is manufactured by. In other words, if the elastic portion, which is a soft material, is wound on a reel and is wrapped with a conductive cloth while being pulled out from the reel, the elastic portion is made of a foam or the like as described above. Even if the pulling force of the feeding roller slightly changes, the size of the elastic portion does not become constant. For example, if the elastic portion is pulled too much, the elastic portion stretches and is wrapped in a conductive cloth in this state, so that when the product becomes a product, the conductive cloth wrinkles and the quality becomes unstable. There was a problem. Therefore, the conventional electromagnetic wave shielding gasket can be manufactured only by a manual operation of wrapping the elastic portion cut into a predetermined length with a conductive cloth.

As a method of manufacturing a long electromagnetic wave shielding gasket, as described in US Pat. No. 4,857,668, a foam corresponding to an elastic portion is filled inside a coating made of a conductive cloth. Some foams are foamed and expanded to form an electromagnetic wave shielding gasket.

However, this method requires a long time for the foam to stabilize, so that the production time is relatively long. Further, a coating is required inside the coating made of the conductive cloth to prevent the foam from bleeding before foaming. Since this coating deprives the flexibility of the conductive cloth, it is difficult to conform to a complicated shape.

Further, a metal foil having a higher electromagnetic wave shielding effect than a conductive cloth is not only easily wrinkled but also easily torn than a conductive cloth, so that an electromagnetic wave using a metal foil instead of the conductive cloth is used. It was extremely difficult to manufacture a shield gasket, and even with the manual method described above, productivity was extremely poor.

A main object of the present invention is to provide an electromagnetic wave shielding gasket having a structure that can be manufactured more easily and at lower cost than conventional methods and that can use a conductive material having a high electromagnetic wave shielding effect, such as a metal foil, which has been conventionally difficult to use. And a method for manufacturing the same.

[0010]

According to a first aspect of the present invention, there is provided an electromagnetic wave shielding gasket having a long and flexible elastic member and at least one outer surface of the elastic member facing the elastic member. An electromagnetic wave shielding gasket comprising: a conductor portion attached to an outer surface side; and attachment means attached to an outer surface of the conductor portion, wherein the elastic portion has a bent portion.

According to a second aspect of the present invention, there is provided an electromagnetic wave shielding gasket comprising: a long elastic body having flexibility; a conductor attached to the elastic body; and an outer surface of the conductor. An electromagnetic wave shielding gasket comprising: a mounting portion attached thereto, wherein the elastic portion has a roll shape, and the conductor portion has at least a roll-shaped curved surface and a portion of which is an outer surface side. Attached to.

[0012] In the case of the electromagnetic wave shielding gasket according to claim 1 or 2 of the present invention, the conductive portion may be not only a conductive cloth as in the conventional case but also a conductive material such as a metal foil or a metal mesh. Good.

On the other hand, the method for manufacturing an electromagnetic wave shielding gasket according to claim 1 of the present invention is characterized in that a substantially rectangular plate-like elastic material as an elastic material is provided on a surface of a substantially same-sized conductor as a conductor material. Is attached, the step of cutting the elastic material and the conductor in a direction substantially orthogonal to the surface of the conductor, and bending the elastic material so that the conductor is disposed outside, The method includes a step of fixing in this state, and a step of attaching an attaching means to a part of the conductor.

According to a second aspect of the present invention, there is provided a method of manufacturing an electromagnetic wave shielding gasket, wherein a conductor having substantially the same size as a conductor portion material is attached to a surface of a substantially rectangular plate-like elastic material serving as an elastic portion material. And a step of cutting the elastic material and the conductor in a direction substantially orthogonal to the surface of the conductor, winding the elastic material such that the conductor is disposed outside, Fixing to a state,
Attaching mounting means to a portion of the conductor facing outward.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of an electromagnetic wave shielding gasket according to the present invention will be described with reference to FIGS. 1 to 3 are schematic perspective views for explaining a method of manufacturing an electromagnetic wave shielding gasket according to a first embodiment of the present invention, and FIG. 3C shows a completed state thereof. FIG. 4 is a schematic cross-sectional view for explaining the operation of the electromagnetic wave shielding gasket according to the first embodiment of the present invention.

An electromagnetic wave shielding gasket 1 according to the present invention.
Reference numeral 0 denotes a long elastic body portion 100 having flexibility, and a conductive member attached from one outer surface side of the elastic body portion 100 to the outer surface side facing the elastic body portion 100 as shown in FIG. It has a body part 200 and a double-sided tape 300 as attachment means attached to the outer surface of the conductor part 200.

The elastic body portion 100 is made of a flexible elastic material such as urethane, EPT, silicone, elastomer, or the like (foam, etc.), similarly to a conventional electromagnetic wave shielding gasket. The elastic portion 100 is bent into two at the position of the bent portion 110 and is formed in a rectangular shape having a substantially U-shaped cross section, and its inner surface contact portion is bonded by an adhesive fixing means such as an adhesive (not shown). Fixed.

The conductor portion 200 is made of a conductive cloth, a conductive nonwoven fabric,
It is made of a metal foil such as aluminum, copper, permalloy, or a conductor such as a metal mesh. A contact portion between the elastic body portion 100 and the conductor portion 200 is also fixed by an adhesive fixing means such as an adhesive (not shown).

The double-sided tape 300 is attached to the lower surface side (the lower side in FIG. 3C) of the conductor portion 200 along the longitudinal direction of the conductor portion 200. This double-sided tape 30
The width dimension of 0 is at least smaller than the width dimension of the lower surface of the conductor section 200, and the depth dimension of the double-sided tape 300 is substantially equal to the depth dimension of the conductor section 200.

Such an electromagnetic wave shielding gasket 10
A method of manufacturing the device will be described. In the method of manufacturing the electromagnetic wave shielding gasket 10, a "step of attaching a conductor of substantially the same size as a conductor part material to a surface of a substantially rectangular plate-like elastic material as an elastic body part material"; A step of cutting the elastic material and the conductor in a direction substantially perpendicular to the surface of the conductor ", and" bending the elastic material so that the conductor is disposed outside, and fixing the elastic material in this state. And a step of attaching an attaching means to a part of the conductor.

First, FIG. 1A shows the “step of attaching a conductor of substantially the same size as the conductor part material to the surface of the substantially rectangular plate-like elastic material as the elastic body part material”. So that the substantially rectangular plate-like elastic material 100a and the conductor 2
00a is prepared. The elastic material 100a is made of urethane, EPT, silicone, elastomer, etc. (foam, etc.)
The conductor 200a is a conductive cloth, a conductive nonwoven fabric, a metal foil of aluminum, copper, permalloy, or the like, a metal mesh, or the like.

The width of the elastic material 100a is determined by the creepage dimension of the conductor 200 of the electromagnetic wave shielding gasket 10 [the width a of the upper surface of the conductor 200 in FIG. Of the upper and lower dimensions b and the width c of the lower surface portion of the electromagnetic wave shielding gasket 10. The size of the conductor 200a is
The size is substantially the same as the size of a.

In FIG. 1A, an adhesive fixing means such as an adhesive (not shown) is applied to the upper surface of the elastic material 100a or the lower surface of the conductor 200a. As shown in FIG. 1B, a conductor 20 is provided on the upper surface of the elastic material 100a.
0a is placed on it and a hot melt processing machine (not shown)
The elastic material 100a and the conductor 200a are sandwiched from above and below, and the entire upper and lower surfaces are heated while being pressurized.
a and the conductor 200a are bonded and fixed.

Next, in the "step of cutting the elastic material and the conductor in a direction substantially orthogonal to the surface of the conductor", as shown in FIG.
00a and the conductor 200a in a direction perpendicular to the plane of the conductor 200a,
Cut at every width dimension equal to the creepage dimension of 00 [the dimension obtained by adding the width dimension a of the upper surface portion, the upper and lower dimension b of the left side surface portion, and the width dimension c of the lower surface portion in FIG. 3C]. I will do it.

In FIG. 2A, a dashed line 500
Indicates a scheduled cutting position. FIG. 2 shows a state of one object after the above-described cutting (hereinafter, referred to as a “strip-shaped body 10W”).
(B). The strip-shaped body 10W includes an elastic material part 100W that is a part of the elastic material 100a and a conductor material part 200W that is a part of the conductor 200a.

Next, in the "step of bending the elastic material so that the conductor is disposed outside and fixing the elastic material in this state", the strip 10W is moved as shown in FIG. Then, the elastic material portion 100W is bent in a direction in which both end portions on the lower surface side are brought into contact with each other. At this time, an adhesive fixing means such as an adhesive (not shown) is applied to the lower surface side of the elastic material portion 100W.

The strip-shaped body 10W thus folded into two is inserted into a rectangular mold having a rectangular cross section of a hot-melt processing machine (not shown), and is heated while being pressed, as shown in FIG. State. That is, the strip-shaped body 10W in the folded state is formed into a substantially rectangular shape in cross section, and the contact surfaces of the folded elastic material portions 100W are bonded and fixed to each other. The strip 10W in this state is referred to as a folded strip 10C. In the folded strip 10C, the elastic material portion 100W has the bent portion 11
The elastic member 100 is formed by folding the elastic member 100 at a position of 0, and the conductive member 200 is adhered and fixed to a surface extending from the upper surface of the elastic member 100 to the lower surface via the left side surface.

Next, in the "step of attaching the attaching means to a part of the conductor", as shown in FIG.
The double-sided tape 300 as an attachment means is attached to the conductor portion 200 as a conductor. Double-sided tape 300
Is attached to the lower surface side of the conductor portion 200 along the longitudinal direction of the conductor portion 200. The width of the double-sided tape 300 is at least narrower than the width of the lower surface of the conductor 200, and the depth of the double-sided tape 300 is
Approximately equal to the depth dimension of. At this stage, the electromagnetic wave shielding gasket 10 is completed.

As described above, since each step is only a simple means, the manufacturing method is simpler than the conventional method.
Cost reduction can be achieved. In addition, in the conventional manufacturing method, wrinkles, metal foils and metal meshes that were difficult to use due to easy occurrence of tears, etc., if the manufacturing method according to the present invention,
Easy to use. Therefore, as the material of the shield material, that is, the material of the conductor portion 200, there are iron, copper, aluminum, permalloy, and the like as metals, and the material must be determined in consideration of conductivity and magnetic permeability depending on the type of electromagnetic wave. However, this manufacturing method can be easily applied.

The function of the electromagnetic wave shielding gasket 10 is as follows.
An example in which the apparatus is installed on a door of an anechoic chamber will be described with reference to FIG. The electromagnetic shielding gasket 10 is shown in FIG.
As shown in (A), the electromagnetic wave shielding gasket 10 extends along the convex portion 611 of the frame 610 of the door of the anechoic chamber on the side where the door 600 of the door of the anechoic chamber comes into contact. Is attached using the double-sided tape 300 of FIG.

In this case, assuming that the upper side of the electromagnetic wave shielding gasket 10 in FIG.
The side where the 0 elastic body part 100 is exposed faces the side facing the gap 650 between the frame body 610 and the door part 600 (see FIG. 4B). This is because the elastic member 100 of the electromagnetic wave shielding gasket 10 has a good appearance.
This is because when a material that easily sucks, accumulates, and generates dust, such as urethane, is used, dust is not generated in the anechoic chamber side. However, when used in a clean room or the like, dust cannot be completely prevented by the structure in which the elastic body portion 100 is exposed like the electromagnetic wave shielding gasket 10, so that the elastic body portion 100 is made of silicone or the like. It is preferable to use a material that does not easily suck, accumulate, and generate dust. Further, it is more preferable that the elastic body portion 100 is of a type that is not exposed, such as an electromagnetic wave shielding gasket 11 described later. In addition, when such cleanliness is required, in the present invention, a metal foil that does not have to worry about sucking, accumulating, and generating dust in the conductor portion 200 can be used.

The gap 650 is provided so as not to collide with the frame 610 because the door 600 is a rotary type. In addition to the approach route, it also serves as a leak route for radio waves from the anechoic chamber.

FIG. 4B shows a state in which the door 600 is closed.
As shown in FIG.
1, the electromagnetic wave shielding gasket 10 is compressed between the two. In this state, the conductor portion 200 of the electromagnetic wave shielding gasket 10
The projection 611 of the frame 610 is brought into contact with the door 600.
Also contact.

Therefore, (the convex portion 611 of the frame body 610)
Since the surfaces of the door unit 600 and the door unit 600 are made of at least conductive materials, the frame body 610 and the door unit 60
0 is electrically connected through the conductor portion 200. An electromagnetic wave from the outside (not shown) that is going to pass through the compressed electromagnetic wave shielding gasket 10 is attenuated by the conductor portion 200 due to absorption loss, reflection loss, and internal reflection loss, and is electromagnetically shielded.

At this time, in the electromagnetic wave shielding gasket 10 of the present invention, a metal foil can be used for the conductor portion 200 instead of the conductive cloth which has been mainly used in the past, so that the shielding effect is improved. Can be. This is because when using a conductive cloth for the conductor portion 200 and when using a metal foil, and when using the same amount of metal per unit area, the difference between the presence or absence of a gap and the use of the metal foil This can increase the shielding effect.

Further, when the door 600 is opened, the force applied to the electromagnetic wave shielding gasket 10 is lost, so that the electromagnetic wave shielding gasket 10
Due to the restoring force of, it returns to its original shape.

Next, an electromagnetic wave shielding gasket according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a schematic perspective view showing a method of manufacturing an electromagnetic wave shielding gasket according to the second embodiment of the present invention, showing a step subsequent to FIG. 1, and FIG. It is a schematic sectional view for explaining the operation of the electromagnetic wave shielding gasket according to the embodiment.

As shown in FIG. 5C, an electromagnetic wave shielding gasket 11 according to the second embodiment of the present invention has a long elastic body portion 101 having flexibility and this elastic body portion. Conductor part 201 attached to the outer periphery of elastic body part 101 with the start and end near the bottom center of base 101
And a double-sided tape 301 as attachment means attached to the outer surface of the conductor portion 201.

The elastic portion 101 is made of a flexible elastic material such as urethane, EPT, silicone, elastomer or the like (foamed material), like the elastic portion 100. The elastic body portion 101 has two bent portions 111 and 111. The elastic body portion 101 is located at the position of the bent portion 111,
Each is bent into two, and both end portions of the elastic body portion 101 are abutted. That is, it is formed in a rectangular shape having a substantially C-shape in cross section. The inner surface contact portion is bonded and fixed by bonding and fixing means such as an adhesive (not shown).

The conductor portion 201 is made of a conductor such as a conductive cloth, a conductive nonwoven fabric, a metal foil such as aluminum, copper, or permalloy, or a metal mesh, similarly to the conductor portion 200.
The contact portion between the elastic body portion 101 and the conductor portion 201 is also bonded and fixed by a bonding means such as an adhesive (not shown).

The double-sided tape 301 is attached to the lower surface of the conductor 201 (the lower side in FIG. 5C) along the longitudinal direction of the conductor 201. At this time, it is preferable from the viewpoint of appearance and strength that the double-sided tape 301 is attached so as to straddle the part where the elastic body part 101 is abutted, that is, the part where the conductive part 201 is abutted. The width of the double-sided tape 301 is at least smaller than the width of the lower surface of the conductor 201, and the depth of the double-sided tape 301 is substantially equal to the depth of the conductor 201.

Such an electromagnetic wave shielding gasket 11
A method of manufacturing the device will be described. In the method of manufacturing the electromagnetic wave shielding gasket 11, similarly to the electromagnetic wave shielding gasket 10, “a conductor of substantially the same size as the conductor part material is attached to the surface of the substantially rectangular plate-like elastic material as the elastic body part material. A step of cutting the elastic material and the conductor in a direction substantially orthogonal to the surface of the conductor, and bending the elastic material so that the conductor is disposed outside, Fixing the material in this state "and" attaching an attaching means to a part of the conductor ".

Also in the specific description, the range shown in FIG. 1, ie, “the step of attaching a conductor of substantially the same size as the conductor part material to the surface of the substantially rectangular plate-like elastic material as the elastic body part material” And "the step of cutting the elastic material and the conductor in a direction substantially orthogonal to the surface of the conductor" are basically the same as those of the electromagnetic wave shielding gasket 10, and therefore the description thereof is omitted.

Therefore, a description will be given after the formation of the strip 10W. However, the width of the strip 10W is cut so as to be equal to the outer peripheral distance of the conductor portion 201 of the electromagnetic wave shielding gasket 11. In the “step of bending the elastic material so that the conductor is disposed outside and fixing the elastic material in this state”, the strip 10W is bent into a C shape as shown in FIG. While bending, both ends of the elastic material portion 100W are bent in a direction in which they abut each other.
At this time, an adhesive fixing means such as an adhesive (not shown) is applied to the lower surface side of the elastic material portion 100W.

The strip 1 thus folded
0W is inserted into a rectangular mold having a rectangular cross section of a hot-melt processing machine (not shown), and heated while being pressed.
The state shown in FIG. That is, the strip-shaped body 10W in a folded state is formed into a substantially rectangular shape in cross section, and the contact surfaces of the folded elastic material portion 100W are bonded and fixed to each other. The strip 10W in this state is referred to as a folded strip 11C. Folded strip 11C
Is an elastic body portion 101 formed by folding the elastic material portion 100W in two at the positions of the two bent portions 111, respectively.
And the conductor portion 201 bonded and fixed to the outer peripheral surface of the elastic body portion 101.

Next, in the "step of attaching an attaching means to a part of the conductor", as shown in FIG.
The double-sided tape 301 as an attachment means is attached to the conductor portion 201 as a conductor. Double-sided tape 301
Is attached to the lower surface side of the conductor portion 201 along the longitudinal direction of the conductor portion 201 so as to straddle a portion where both ends of the elastic material portion 100W abut each other. The width of the double-sided tape 301 is at least smaller than the width of the lower surface of the conductor 201, and the depth of the double-sided tape 301 is substantially equal to the depth of the conductor 201. At this stage, the electromagnetic wave shielding gasket 11 is completed.

As described above, the electromagnetic wave shielding gasket 1
Also in the case of 1, as in the case of the electromagnetic wave shielding gasket 10, since each step is only a simple means, the manufacturing method is simpler and the cost can be reduced as compared with the related art.
In addition, metal foils, metal meshes, and the like, which have been difficult to use in the conventional manufacturing method because they are apt to cause wrinkles and tears, can be easily used in the manufacturing method according to the present invention.
Therefore, as the material of the shield material, that is, the material of the conductor portion 201, there are iron, copper, aluminum, permalloy, and the like as metals, and the material must be determined in consideration of conductivity, magnetic permeability, and the like depending on the type of electromagnetic wave. However, this manufacturing method can be easily applied.

The function of the electromagnetic wave shielding gasket 11 is as follows.
An example in which the apparatus is installed on the door of an anechoic chamber will be described with reference to FIG. The electromagnetic shielding gasket 11 is shown in FIG.
As shown in (A), the electromagnetic wave shielding gasket 11 extends along the convex portion 611 of the anechoic chamber door frame 610 on the side where the door portion 600 of the anechoic chamber abuts. Is attached using the double-sided tape 301 of FIG.

At this time, as in the case of the electromagnetic wave shielding gasket 10, since the end of the elastic body portion 101 is not exposed, the left and right mounting directions of the electromagnetic wave shielding gasket 11 in FIG. No need.

FIG. 6B shows a state in which the door 600 is closed.
As shown in FIG.
1, the electromagnetic wave shielding gasket 11 is compressed between the two. In this state, the conductor portion 201 of the electromagnetic wave shielding gasket 11
The projection 611 of the frame 610 is brought into contact with the door 600.
Also contact.

Therefore, (the convex portion 611 of the frame body 610)
Since the surfaces of the door unit 600 and the door unit 600 are made of at least conductive materials, the frame body 610 and the door unit 60
0 is electrically connected via the conductor portion 201. The electromagnetic wave from the outside (not shown) that is going to pass through the compressed electromagnetic wave shielding gasket 11 is attenuated by the conductor portion 201 due to absorption loss, reflection loss, and internal reflection loss, and is electromagnetically shielded.

At this time, in the electromagnetic wave shielding gasket 11 of the present invention, a metal foil can be used for the conductor portion 201 instead of the conductive cloth which has been mainly used in the past, so that the shielding effect is improved. Can be. Also,
The electromagnetic wave shielding gasket 11 has a higher electromagnetic wave shielding effect than the electromagnetic wave shielding gasket 10 because the total thickness of the conductor portion 201 is twice as large as the electromagnetic wave ingress / leakage path at the time of installation. In addition, since the end of the elastic portion 101 is not exposed as described above, if a metal foil is used for the conductive portion 201, the electromagnetic wave shielding gasket 11 has an optimal structure in a place where dust is not desired, such as a clean room. ing.

Next, an electromagnetic wave shielding gasket according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a schematic perspective view for explaining a method of manufacturing an electromagnetic wave shielding gasket according to the third embodiment of the present invention, showing a step after FIG. 1, and FIG. FIG. 9 is a schematic cross-sectional view for explaining the operation of the electromagnetic wave shielding gasket according to the third embodiment;
FIG. 9 is a schematic cross-sectional view for explaining that the electromagnetic wave shielding gasket according to the third embodiment has a higher electromagnetic wave shielding effect than a conventional electromagnetic wave shielding gasket.

As shown in FIG. 7B, an electromagnetic wave shielding gasket 12 according to a third embodiment of the present invention has a long elastic body portion 102 having flexibility and an elastic body portion 102. And a mounting means 302 attached to the outer surface of the conductive portion 202.
The elastic member 102 has a roll shape, and the conductor portion 202 is at least a roll-shaped curved surface and a part thereof is attached to a surface on the outer surface side.

The elastic portion 102 is made of a flexible elastic material such as urethane, EPT, silicone, elastomer or the like (foam or the like), like the elastic portion 100 or the elastic portion 101.

The conductor portion 202, like the conductor portion 200 and the conductor portion 201, is made of a conductor such as a conductive cloth, a conductive nonwoven fabric, a metal foil such as aluminum, copper, permalloy, or a metal mesh. The contact portion between the elastic portion 102 and the conductor portion 202 is fixedly adhered by an adhesive fixing means such as an adhesive (not shown).

The double-sided tape 302 is attached to the lower surface of the conductor 202 (the lower side in FIG. 7B) along the longitudinal direction of the conductor 201. This double-sided tape 30
The width dimension of 1 is sufficiently smaller than the diameter dimension of the conductor section 201, and the depth dimension of the double-sided tape 301 is substantially equal to the depth dimension of the conductor section 201.

Such an electromagnetic wave shielding gasket 12
A method of manufacturing the device will be described. The manufacturing method of the electromagnetic wave shielding gasket 12 includes “a step of attaching a conductor of substantially the same size as a conductor part material to a surface of a substantially rectangular plate-like elastic material as an elastic body part material”; And a step of cutting the conductor in a direction substantially orthogonal to the surface of the conductor, and a step of wrapping the elastic material so that the conductor is disposed outside and fixing the elastic material in this state. And "attaching an attaching means to a part of the conductor facing the outside".

Among the above steps, "a step of attaching a conductor of substantially the same size as the conductor part material to the surface of the substantially rectangular plate-like elastic material as the elastic body part material"; The step of cutting the conductor in a direction substantially perpendicular to the surface of the conductor "is basically the same as the method of manufacturing the electromagnetic wave shielding gasket 10 (the step in the range of FIG. 1), and therefore description thereof is omitted. I do.

Therefore, description will be made after the strip-shaped body 10W is formed. However, the width of the strip 10W is a width when the electromagnetic wave shielding gasket 12 is deployed.

In the "step of winding the elastic material so that the conductor is disposed outside and fixing the elastic material in this state", the strip 10W is wound in a roll shape. At this time, an adhesive fixing means such as an adhesive (not shown) is applied to the lower surface side of the elastic material portion 100W.

The strip-shaped body 10W thus wound
Is inserted into a mold having a substantially circular shape in cross section of a hot-melt processing machine (not shown), and heated while being pressed, as shown in FIG.
It is adhesively fixed in the state. The rolled strip-shaped body 10W is referred to as a roll-shaped body 12C. The roll-shaped body 12C has a state in which the elastic body portion 102 in which the elastic material portion 100W is formed in a roll shape and the conductor portion 202 in which the conductive material portion 200W is formed in a roll shape are overlapped and fixed in a roll shape. Things.

Next, in the “step of attaching attachment means to a part of the conductor facing outside”, as shown in FIG. 7B, the double-sided tape 302 as attachment means is used.
Is attached on the bottom side of the roll-shaped body 12C, along the longitudinal direction of the roll-shaped body 12C, with its width dimension being sufficiently smaller than the diameter of the roll-shaped body 12C. The depth dimension of the double-sided tape 302 is substantially equal to the depth dimension of the conductor portion 202. At the stage where the double-sided tape 302 is attached, the electromagnetic wave shielding gasket 12 is completed.

As described above, the electromagnetic wave shielding gasket 1
In step 2, since each step is only a simple means, the manufacturing method is simpler than in the past, and the cost can be reduced. In addition, metal foils, metal meshes, and the like, which have been difficult to use in the conventional manufacturing method because they are apt to cause wrinkles and tears, can be easily used in the manufacturing method according to the present invention. Therefore, the shield material, that is, the conductor portion 202
Materials include iron, copper, aluminum, permalloy, and the like.Even if it is necessary to determine the material while taking into account the conductivity and magnetic permeability depending on the type of electromagnetic wave, this manufacturing method is easy. Can respond to.

The function of the electromagnetic wave shielding gasket 12 is as follows.
An example in which the apparatus is installed on a door of an anechoic chamber will be described with reference to FIG. The electromagnetic wave shielding gasket 12 is shown in FIG.
As shown in (A), the electromagnetic wave shielding gasket 12 extends along the convex portion 611 of the anechoic chamber door frame 610 on the side where the door 600 of the anechoic chamber door comes into contact. Is attached using the double-sided tape 302.

At this time, as in the case of the electromagnetic wave shielding gasket 10, the end of the elastic body portion 101 is exposed, and the mounting direction of the electromagnetic wave shielding gasket 12 in this case is such that the upper side in FIG. Assuming that the elastic member 102 of the electromagnetic wave shielding gasket 12 is exposed, the frame 610 and the door 60
0 toward the gap 650. This is because the electromagnetic shielding gasket 1
This is because when a material that easily sucks, accumulates, and generates dust, such as urethane, is used for the second elastic body portion 100, dust is not generated toward the anechoic chamber. However, in a case where the elastic member 102 is used in a clean room or the like, the dust cannot be completely prevented by the structure where the elastic member 102 is exposed like the electromagnetic wave shielding gasket 12, so that the elastic member 102 is made of silicone or the like. It is preferable to use a material that does not easily suck, accumulate, and generate dust. Further, it is more preferable that the elastic body 102 is not exposed, as in the case of the electromagnetic wave shielding gasket 11 described above. Also, when cleanliness is required as described above, in the present invention, the conductor portion 2 is used.
Metal foil that does not have to worry about sucking, accumulating, and generating dust can be used.

FIG. 8B shows a state in which the door 600 is closed.
As shown in FIG.
1, the electromagnetic wave shielding gasket 12 is compressed by being sandwiched between the two. In this state, the conductor portion 202 of the electromagnetic wave shielding gasket 12
The projection 611 of the frame 610 is brought into contact with the door 600.
Also contact.

Therefore, (the convex portion 611 of the frame body 610)
Since the surfaces of the door unit 600 and the door unit 600 are made of at least conductive materials, the frame body 610 and the door unit 60
0 is electrically connected through the conductor portion 202. The electromagnetic wave from the outside (not shown) that is going to pass through the compressed electromagnetic wave shielding gasket 12 is attenuated by the conductor portion 202 due to absorption loss, reflection loss, and internal reflection loss, and is electromagnetically shielded.

In this case, since the electromagnetic wave shielding gasket 12 of the present invention can use a metal foil for the conductor portion 201 instead of the conductive cloth which has been mainly used in the past, it is necessary to enhance the shielding effect. Can be. Also,
The electromagnetic wave shielding gasket 12 has a larger number of rolls of the conductor portion 202, so that the closer to the center of the electromagnetic wave shielding gasket 11 [see FIG. Overall thickness can be increased,
The electromagnetic wave shielding effect can be increased. For example, FIG.
In the case shown in (B), an external electromagnetic wave γ
The thickness of the electromagnetic wave shielding gasket 11 [FIG.
(See (A)), the electromagnetic wave shielding effect is 3.5 times higher.

By the way, in the first embodiment and the second embodiment, "the step of bending the elastic material so that the conductor is disposed outside and fixing the elastic material in this state", and the third step. In the embodiment of the "step of winding the elastic material so that the conductor is disposed outside, and fixing the elastic material in this state",
As the means for “fixing the elastic material in this state”, an adhesive fixing means such as an adhesive is used, but a fixing means such as sewing may be used.

[0071]

As described above, according to the first aspect of the present invention,
The electromagnetic wave shielding gasket according to the present invention has a long elastic body portion having flexibility, a conductor portion attached from at least one outer surface side of the elastic body portion to an outer surface side opposed thereto, and the conductor portion And an attaching means attached to the outer surface of the electromagnetic wave shielding gasket, wherein the elastic body portion has a bent portion.

Therefore, in the case of the electromagnetic wave shielding gasket according to the first aspect of the present invention, the structure at the completion stage is characterized by the structure of the elastic portion on the inner side, so that the cost can be reduced more easily than in the past. An electromagnetic wave shielding gasket having a structure that can be manufactured using a conductive material having a high electromagnetic wave shielding effect, such as a metal foil, which has been conventionally difficult to use.

In the case of the electromagnetic wave shielding gasket according to the first aspect of the present invention, the conductive portion may be not only a conductive cloth as in the related art but also a conductive material such as a metal foil or a metal mesh. For this reason, as the material of the conductor portion, for example, as the metal, iron, copper, aluminum, permalloy, or the like that can be easily used in consideration of the conductivity and magnetic permeability in accordance with the type of electromagnetic wave can be used. In particular, metal foil has a higher electromagnetic wave shielding effect than conductive cloth. Therefore, the electromagnetic wave shielding effect can be higher than that of the conventional electromagnetic wave shielding gasket. In addition, since a metal foil that does not have to worry about sucking, accumulating, and generating dust can be used for the conductor, an electromagnetic wave shielding gasket that is optimal for a place where dust is not desired, such as a clean room, can be provided.

According to the method for manufacturing an electromagnetic wave shielding gasket according to the first aspect of the present invention, a conductor having substantially the same size as a conductor part material is attached to a surface of a substantially rectangular plate-like elastic material as an elastic body part material. And a step of cutting the elastic material and the conductor in a direction substantially orthogonal to a surface of the conductor, and bending the elastic material so that the conductor is disposed outside, and bringing the elastic material into this state. Fixing to the
And attaching a mounting means to a part of the conductor. Therefore, compared to the conventional electromagnetic wave shielding gasket, only a simple manufacturing process is required, so that the manufacturing is easy and the cost can be reduced.

The electromagnetic wave shielding gasket according to claim 2 of the present invention has a long elastic body having flexibility, a conductor attached to the elastic body, and an outer surface of the conductor. An electromagnetic wave shielding gasket comprising: a mounting portion attached thereto, wherein the elastic portion has a roll shape, and the conductor portion has at least a roll-shaped curved surface and a portion of which is an outer surface side. Attached to.

Therefore, in the case of the electromagnetic wave shielding gasket according to the second aspect of the present invention, the characteristic feature of the structure of the elastic body allows the manufacturing to be performed more easily and at lower cost than in the conventional case.
In addition, the electromagnetic wave shielding gasket has a structure in which a conductive material having a high electromagnetic wave shielding effect, such as a metal foil, which has conventionally been difficult to use, can be used.

Also in the case of the electromagnetic wave shielding gasket according to the second aspect of the present invention, the conductive portion may be not only a conductive cloth as in the related art but also a conductive material such as a metal foil or a metal mesh. For this reason, as the material of the conductor portion, for example, as the metal, iron, copper, aluminum, permalloy, or the like that can be easily used in consideration of the conductivity and magnetic permeability in accordance with the type of electromagnetic wave can be used. Further, in particular, the metal foil has a higher electromagnetic wave shielding effect than the conductive cloth. Therefore, the electromagnetic wave shielding effect can be higher than that of the conventional electromagnetic wave shielding gasket.

Further, in the case of the electromagnetic wave shielding gasket according to the second aspect of the present invention, since the conductive portion has a roll shape, the electromagnetic wave shielding effect is enhanced as the number of turns increases. A gasket can be provided. In addition, since a metal foil that does not have to worry about sucking, accumulating, and generating dust can be used for the conductor, an electromagnetic wave shielding gasket that is optimal for a place where dust is not desired, such as a clean room, can be provided.

According to a second aspect of the present invention, there is provided a method of manufacturing an electromagnetic wave shielding gasket, wherein a conductor having substantially the same size as a conductor portion material is attached to a surface of a substantially rectangular plate-like elastic material serving as an elastic body portion material. And a step of cutting the elastic material and the conductor in a direction substantially orthogonal to the surface of the conductor, winding the elastic material such that the conductor is disposed outside, Fixing to a state,
Attaching a mounting means to a part of the conductor facing the outside. Therefore, compared to the conventional electromagnetic wave shielding gasket, only a simple manufacturing process is required, so that the manufacturing is easy and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view for explaining a method of manufacturing an electromagnetic wave shielding gasket according to a first embodiment of the present invention.

FIG. 2 is a schematic perspective view for explaining a method of manufacturing the electromagnetic wave shielding gasket according to the first embodiment of the present invention.

FIG. 3 is a schematic perspective view for explaining a method of manufacturing the electromagnetic wave shielding gasket according to the first embodiment of the present invention, and FIG. 3 (C) shows a completed state thereof.

FIG. 4 is a schematic cross-sectional view for explaining the operation of the electromagnetic wave shielding gasket according to the first embodiment of the present invention.

FIG. 5 is a schematic perspective view showing a method for manufacturing an electromagnetic wave shielding gasket according to a second embodiment of the present invention,
FIG. 2 shows a step subsequent to FIG. 1.

FIG. 6 is a schematic cross-sectional view for explaining an operation of the electromagnetic wave shielding gasket according to the second embodiment of the present invention.

FIG. 7 is a schematic perspective view for explaining a method of manufacturing an electromagnetic wave shielding gasket according to a third embodiment of the present invention, and shows a step subsequent to FIG.

FIG. 8 is a schematic cross-sectional view for explaining the operation of the electromagnetic wave shielding gasket according to the third embodiment of the present invention.

FIG. 9 is a schematic cross-sectional view for explaining that the electromagnetic wave shielding gasket according to the third embodiment has a higher electromagnetic wave shielding effect than a conventional electromagnetic wave shielding gasket.

FIG. 10 is a schematic sectional view showing a conventional electromagnetic wave shielding gasket.

[Explanation of symbols]

 Reference Signs List 10 electromagnetic wave shielding gasket 100 elastic part 110 bent part 200 conductor part 300 double-sided tape (attaching means)

Claims (5)

[Claims] 1. An elongated elastic body portion having flexibility, a conductor portion attached from at least one outer surface side of the elastic body portion to an outer surface side opposed thereto, and an outer surface of the conductor portion An electromagnetic wave shielding gasket comprising: an attaching means attached to the electromagnetic wave shielding gasket, wherein the elastic body portion has a bent portion. 2. An electromagnetic wave shield comprising: a long elastic body having flexibility; a conductor attached to the elastic body; and mounting means attached to an outer surface of the conductor. An electromagnetic wave, wherein the elastic portion has a roll shape, and the conductor portion has at least a roll-shaped curved surface, and a part of the conductive portion is attached to a surface on an outer surface side. Shield gasket. 3. The apparatus according to claim 1, wherein the conductor is a conductor such as a metal foil, a metal mesh, or a conductive cloth.
Or the electromagnetic wave shielding gasket according to 2. 4. An elongated elastic member having flexibility, a conductor attached from at least one outer surface of the elastic member to an outer surface facing the elastic member, and an outer surface of the conductor. Wherein the elastic member has a bent portion. The method according to claim 1, wherein the elastic member has a bent portion. A step of attaching a conductor of substantially the same size as a component material, a step of cutting the elastic material and the conductor in a direction substantially orthogonal to a surface of the conductor, and a step of disposing the conductor outside. Bending the elastic material to fix the elastic material in this state, and attaching an attaching means to a part of the conductor. 5. An electronic apparatus comprising: a long elastic body having flexibility; a conductor attached to the elastic body; and an attaching means attached to an outer surface of the conductor. A manufacturing method of an electromagnetic wave shielding gasket, wherein the elastic portion has a roll shape, and the conductive portion has at least a roll-shaped curved surface and a part of which is attached to a surface which is an outer surface side; A step of attaching a conductor of substantially the same size as a conductor part material to a surface of a substantially rectangular plate-shaped elastic material as a part material, and making the elastic material and the conductor substantially orthogonal to the surface of the conductor. Cutting in the direction, winding the elastic material so that the conductor is disposed outside, fixing the elastic material in this state, and attaching means to a part of the conductor facing outside. Having an attaching step Method of manufacturing an electromagnetic wave shielding gasket according to claim.