JPH10326989A - Electromagnetic wave shielding gasket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the performance of shielding effect securely without considering the distance between a frame body and a door strictly, and to prevent the deformation or the break of a base part by excessive pressing of it. SOLUTION: A gasket is an electromagnetic shielding gasket A for shielding electromagnetic waves between a door 600 that is an opening and closing member attached to a frame body openably an the frame body 610, and provided with a base part 100, a conductive cloth 300 having conductivity wrapping the long base part 100 having flexibility, a magnet 200 accommodated inside the base part 100, and an angle 500 that is a conductive attaching means attached on the outer surface of the conductive cloth 300. It is structured to be attached to the frame body 610 with the angle 500.

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 an anechoic chamber, for example, to block electromagnetic waves.

[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.

An electromagnetic wave shielding gasket S shown in FIG.
Is a flexible material such as urethane, EPT, silicone, etc., which has high elasticity,
A base part 100 made of “foam or the like”), and a conductive cloth 30 having conductivity that surrounds the base part 100.
0, and a double-sided tape 400 as an attachment means attached to the outer surface of the conductive cloth 300.

The base portion 100 is a long one having a certain length (for example, 1 m) having a substantially rectangular shape or an L-shape in cross section. The conductive portion 300 is wrapped by bonding. It covers the outside. The double-sided tape 400 is attached to the back side of the electromagnetic wave shielding gasket S, which is the butted portion of the conductive cloth 300. The double-sided tape 400 is attached to, for example, a frame 610 to which a door 600 of an anechoic chamber is attached, and electromagnetically blocks a gap between the door 600 and the frame 610.

[0005]

However, the above-mentioned conventional electromagnetic wave shielding gasket has the following problems. That is, as shown in FIG.
Since the door 600 is in close contact with the electromagnetic wave shielding gasket S attached to the electromagnetic wave shielding gasket S, the compression allowance of the base portion 100 of the electromagnetic wave shielding gasket S (generally, about 25% of the thickness of the electromagnetic wave shielding gasket S) is taken into consideration. , The distance α between the frame 610 and the door 600 needs to be determined. That is, if the distance α is too large, the door 600 does not contact the electromagnetic wave shielding gasket S, and a gap G is generated between the door 600 and the electromagnetic wave shielding gasket S, and the shielding effect is cut off by the gap G. I will.
Conversely, if the distance α is too small, the base portion 100 of the electromagnetic wave shielding gasket may be excessively compressed by the door 600 and may be deformed or damaged.

The present invention has been made in view of the above circumstances, and can exert a reliable shielding effect without strictly considering the distance between the frame body and the door as compared with the related art, and furthermore, has an excessively large base portion. It is an object of the present invention to provide an electromagnetic wave shielding gasket which does not cause deformation, breakage, and the like due to compression.

[0007]

An electromagnetic wave shielding gasket according to the present invention is an electromagnetic wave shielding gasket for shielding an electromagnetic wave between an opening / closing member attached to a frame and being openable and closable, and the frame. A long base portion having a property, a magnet included in the base portion, a conductive cloth wrapping the base portion, and a conductive material attached to an outer surface of the conductive cloth. Mounting means, and is configured to be mounted on the frame and / or the door by the mounting means.

Further, an electromagnetic wave shielding gasket according to the present invention is an electromagnetic wave shielding gasket for shielding an electromagnetic wave between an opening / closing member attached to a frame so as to be openable and closable and the frame, and having a flexible length. A scale-shaped base portion, a magnet included in the base portion, a conductive cloth having conductivity surrounding the base portion, and mounting means attached to an outer surface of the conductive cloth, The conductive cloth is in contact with the frame and / or door on which the electromagnetic wave shielding gasket is mounted.

[0009]

FIG. 1 is a schematic sectional view showing the relationship between an electromagnetic wave shielding gasket, a door and a frame according to a first embodiment of the present invention, and FIG. 2 is a first embodiment of the present invention. Schematic front view of the electromagnetic wave shielding gasket according to the embodiment, FIG.
FIG. 4 is a schematic sectional view showing the relationship between an electromagnetic wave shielding gasket, a door, and a frame according to a second embodiment of the present invention.
FIG. 5 is a schematic cross-sectional view showing a relationship between an electromagnetic wave shielding gasket, a door, and a frame according to a third embodiment of the present invention.
FIGS. 7A and 7B are diagrams showing a relationship between an electromagnetic wave shielding gasket, a door and a frame according to a third embodiment of the present invention, wherein FIG. 7A is a schematic cross-sectional view, and FIG. It is a schematic sectional drawing of the state which is not attached. It is to be noted that parts and the like that are substantially the same as those of the related art are denoted by the same reference numerals and described.

As shown in FIG. 1, an electromagnetic wave shielding gasket A according to a first embodiment of the present invention has a long base 100 having flexibility and a magnet included in the base 100. 200, a conductive cloth 300 having conductivity surrounding the base portion 100, and the conductive cloth 3
00 as an attachment means attached to the outer surface of 00
0.

The base portion 100 is made of a flexible foam such as urethane, EPT, or silicon, similarly to a conventional electromagnetic wave shielding gasket. The base portion 100 is formed in a substantially rectangular shape in cross section.

Inside the base 100, a magnet 200 having flexibility similar to the base 100, which is a so-called rubber magnet, is included. This magnet 200
The electromagnetic wave shielding gasket A attached to the frame body 610 is provided not at the center of the base portion 100 but at a position near the door 600 as a closed opening / closing member. Since ferrite has a property of absorbing electromagnetic waves by itself, it is desirable to use a ferrite magnet as the magnet 200.

The conductive cloth 300 is formed, for example, by applying a conductive coating to the cloth itself and has conductivity. The base portion 100 in which the magnet 200 is included is wrapped by the conductive cloth 300.

A conductive double-sided tape 400 is attached to the conductive cloth 300. In addition, the double-sided tape 400 is attached so as to straddle the portion where the both ends of the conductive cloth 300 are abutted.

The angle 500 is made of a metal plate in the form of a flat plate having conductivity.
00 is attached to the outer surface of the conductive cloth 300.
Therefore, the angle 500 is conducted to the conductive cloth 300 via the double-sided tape 400. In addition, this angle 500
Is mounted on the side far from the magnet 200.

As shown in FIG. 2, a plurality of screw holes 510 for attaching the electromagnetic wave shielding gasket A to the frame 610 are formed in the angle 500 at predetermined intervals.

The operation of the thus constructed electromagnetic wave shielding gasket A will be described. It is assumed that the electromagnetic wave shielding gasket A is attached along a frame 610 to which a door 600 is attached so as to be openable and closable, for example, as shown in FIG. Frame 61 of this electromagnetic wave shielding gasket A
The attachment to zero is performed using the screw hole 510 and the screw 520 of the angle 500.

When the door 600 is closed, the door 600 is pressed toward the frame 610, so that the electromagnetic wave shielding gasket A is sandwiched between them and compressed. In this state, the conductive cloth 300 contacts the door 600 and also contacts the frame 610. Therefore, the door 600 and the frame 610 are connected to the conductive cloth 30 of the electromagnetic wave shielding gasket A.
Since they are electrically connected via the 0 and the angle 500, electromagnetic shielding is performed between the two.

Particularly, since the magnet 200 is located on the door 600 side, when the door 600 is about to be closed, the door 60 is closed.
If 0 is made of a magnetic material, it is adsorbed, so
00 closely adheres to the electromagnetic wave shielding gasket A, that is, the conductive cloth 300 on the outer surface.

Further, when the door 600 is opened, the force applied to the electromagnetic wave shielding gasket A disappears, so that the electromagnetic wave shielding gasket A returns to its original shape by the restoring force of the base portion 100.

Next, an electromagnetic wave shielding gasket B according to a second embodiment of the present invention will be described with reference to FIG. An electromagnetic wave shield gasket B according to the second embodiment differs from the electromagnetic wave shield gasket A according to the first embodiment in that the angle
It is the shape of. That is, as shown in FIG. 3, the angle 530 of the electromagnetic wave shielding gasket B according to the second embodiment has a substantially hairpin shape in cross-section where the front side 531 and the back side 532 face each other. 610
Is sandwiched between the front side portion 531 and the back side portion 532 to attach the electromagnetic wave shielding gasket B to the frame body 610. Since the conductive cloth 300 is attached to the angle 530 with the conductive double-sided tape 400, the angle 530 and the conductive cloth 300
Is conducted by the double-sided tape 400.

By forming the angle 530 in a substantially hairpin shape in a sectional view, the mounting of the electromagnetic wave shielding gasket B on the frame 610 becomes very easy, and the frame 610 is sandwiched from both front and back sides. 6
There is an effect that conduction between 00 and the frame 610 becomes more reliable. The edge of the back side portion 532 of the angle 530 is slightly curved outward so as to be easily pinched by the operator's finger or the like.

Next, an electromagnetic wave shielding gasket C according to a third embodiment of the present invention will be described with reference to FIG. An electromagnetic wave shielding gasket C according to the third embodiment is different from the two electromagnetic wave shielding gaskets A and B described above in that the two electromagnetic wave shielding gaskets A and B are connected to the conductive cloth 3 via the angles 500 and 530.
00 was conducted to the frame 610, whereas the electromagnetic wave shielding gasket C provided the conductive cloth 300 and the frame 61.
0 is directly conducted.

Therefore, the electromagnetic wave shielding gasket C according to the third embodiment is configured as follows. First, the electromagnetic wave shielding gasket C includes a long base 100 having flexibility and a base 10.
0, a conductive cloth 300 having conductivity surrounding the base section 100, and an angle 540 as an attachment means attached to an outer surface of the conductive cloth 300.

The angle 540 of the electromagnetic wave shielding gasket C does not need to have conductivity, and for example, a non-conductive synthetic resin or the like can be used. The angle 540 is formed in a substantially hairpin shape in cross-section where the front side 541 and the back side 542 face each other.
The electromagnetic wave shielding gasket C is attached to the frame 610 by sandwiching a part of the frame 610.
The edge of the rear side portion 542 of the angle 540 is slightly curved outward so as to be easily pinched by the operator's finger or the like. Further, a claw portion 543 for cutting into the frame body 610 is formed inside the back side portion 542.

Further, the base portion 100 is formed in a substantially semi-cylindrical shape when viewed in cross section.
Is included. Unlike the base part 100 of the electromagnetic wave shielding gaskets A and B, the base part 100 is directly attached to the angle 540.

On the other hand, the conductive cloth 300, which is a characteristic part of the electromagnetic wave shielding gasket C, is
And one end thereof is located between the front side portion 541 and the back side portion 542 of the angle 540, that is, a portion where a part of the frame body 610 is sandwiched.
It extends to 42.

This electromagnetic wave shielding gasket C is
10, the conductive cloth 300 is angled at 540.
Between the front side 541 and the frame body 610, the door 600 in contact with the conductive cloth 300 is
0 is electrically connected to the frame 610.

When the door 600 is closed, it is attracted by the magnet 200 if the door 600 is made of a magnetic material.
0 and the conductive cloth 300, and thus the continuity with the frame 610 can be reliably ensured.

In addition to the above three patterns of electromagnetic wave shielding gaskets A, B and C, an electromagnetic wave shielding gasket D using an angle 550 as shown in FIG. 5 is also conceivable. In the angle 550 having a substantially L-shaped cross section,
Since there is no angle 550 between the frame 610 and the conductive cloth 300, the conductive cloth 300 and the frame 610 are in direct contact. Therefore, the angle 550 can also be made of a synthetic resin having no conductivity.

In this case, as shown in FIG. 5B, it is desirable that the side contacting the frame 610 protrudes slightly outward from the angle 550. That is, by protruding outward from the angle 550 in this way, when the conductive cloth 300 is attached to the frame 610, the conductive cloth 300 reliably contacts the frame 610.

An angle 500 as a mounting member,
Instead of using 530 and 540, a conductive double-sided tape or conductive adhesive may be used as the attachment member.
In this case, there is an effect that members corresponding to the angles 500, 530, and 540 become unnecessary.

In the above embodiment, the electromagnetic wave shielding gaskets A, B, C, and D are described as being attached to the frame 610, but the present invention is not limited to this. Electromagnetic wave shielding gasket A,
B, C, and D may be attached to the door 600 in reverse, or the door 6
00 and the frame body 610.

[0034]

The electromagnetic wave shielding gasket according to the present invention is an electromagnetic wave shielding gasket for shielding an electromagnetic wave between an opening / closing member attached to a frame so as to be able to open and close and the frame, and has a flexible length. A scale-shaped base portion, a magnet included in the base portion, a conductive cloth having conductivity surrounding the base portion, and a mounting means having conductivity attached to an outer surface of the conductive cloth. And is configured to be attached to the frame and / or the door by the attaching means.

Accordingly, when the electromagnetic wave shielding gasket is attached only to the frame, if the door is made of a magnetic material, it is attracted by the magnet, so that the gap H (door 600) shown in FIG.
When the gap between the door and the frame 610 is secured, the door surely adheres to the electromagnetic wave shielding gasket, and the door is electrically conducted through the conductive cloth and the mounting member. For this reason, a reliable shielding effect can be exhibited without strictly considering the compression allowance of the electromagnetic wave shielding gasket and the distance between the frame and the door as in the related art. In addition, when the door is in the closed state, the door is attracted by the magnet, so that there is no excessive compression of the base portion and no deformation or breakage due to this is caused.

The same applies to the case where this electromagnetic wave shielding gasket is attached only to the door or the case where it is attached to both the door and the frame.

Another electromagnetic wave shielding gasket according to the present invention is an electromagnetic wave shielding gasket for shielding an electromagnetic wave between an opening / closing member attached to a frame so as to be openable and closable and the frame, and having flexibility. A long base portion, a magnet included in the base portion, a conductive cloth wrapping the base portion, and mounting means attached to an outer surface of the conductive cloth. The conductive cloth is in contact with a frame and / or a door on which the electromagnetic wave shielding gasket is mounted.

Therefore, according to this electromagnetic wave shielding gasket, not only the effect of the above-mentioned electromagnetic wave shielding gasket but also the effect that there is no need to form the mounting means with a conductive material is obtained. That is, since the mounting means can be made of a non-conductive synthetic resin or the like which can be formed at a lower cost, an electromagnetic wave shielding gasket can be provided which is inexpensive and can exert a reliable electromagnetic wave shielding effect.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a relationship between an electromagnetic wave shielding gasket, a door, and a frame according to a first embodiment of the present invention.

FIG. 2 is a schematic front view of the electromagnetic wave shielding gasket according to the first embodiment of the present invention.

FIG. 3 is a schematic sectional view showing a relationship between an electromagnetic wave shielding gasket, a door, and a frame according to a second embodiment of the present invention.

FIG. 4 is a schematic sectional view showing a relationship between an electromagnetic wave shielding gasket, a door, and a frame according to a third embodiment of the present invention.

5A and 5B are diagrams showing a relationship between an electromagnetic wave shielding gasket, a door and a frame according to a third embodiment of the present invention, wherein FIG. 5A is a schematic cross-sectional view, and FIG. It is a schematic sectional drawing in the state not attached to the frame.

FIG. 6 is a schematic sectional view showing a relationship between a conventional electromagnetic shielding gasket of this type, a door, and a frame.

[Explanation of symbols]

REFERENCE SIGNS LIST 100 base portion 200 magnet 300 conductive cloth 500 angle A electromagnetic wave shielding gasket (according to the third embodiment)

Claims (2)

[Claims] An electromagnetic wave shielding gasket for shielding an electromagnetic wave between an opening / closing member attached to a frame so as to be able to open and close and the frame, an elongated base having flexibility, and A conductive cloth surrounding the base, the conductive cloth surrounding the base, and conductive mounting means attached to an outer surface of the conductive cloth; An electromagnetic wave shielding gasket which is attached to a body and / or a door. 2. An electromagnetic wave shielding gasket for shielding an electromagnetic wave between an opening / closing member openably and closably attached to a frame and the frame, a flexible long base, and a flexible base. An electromagnet, a conductive cloth wrapping the base portion, and mounting means attached to an outer surface of the conductive cloth, wherein the conductive cloth is provided with an electromagnetic wave shielding gasket. An electromagnetic wave shielding gasket, which is in contact with a frame and / or a door provided.