JP7142354B2 - Shield material connection structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to a connection structure of a connecting portion when connecting electromagnetic wave shielding materials to each other.

Shielding materials are used in electromagnetic shielding boxes, electromagnetic shielding tents, entrances and exits of laboratories, etc., so as not to be affected by electromagnetic waves from the outside.
In order to form these shielded environments, it is necessary to have entrances and exits for equipment, researchers, and measurement personnel.
In this case, if the mutual bonding between the shield material for forming the opening member and the doorway and the shield material for forming the periphery of the opening of the shield box or shield tent is insufficient, electromagnetic waves may leak from that part. be.

Patent Documents 1 and 2 disclose a structure in which a conductive hook-and-loop fastener is provided between the opening and closing portion and the peripheral portion of the opening.
These conductive hook-and-loop fasteners have metal-plated cores of loops and hooks.
However, such loops and hooks coated with plating or the like have weak mutual contact pressure, insufficient electrical connectivity, and repeated engagement and disengagement due to the coating peeling off easily, resulting in reduced shielding performance. I had a problem.

JP-A-8-52010 JP-A-2-185204

SUMMARY OF THE INVENTION It is an object of the present invention to provide a connection structure for shield members that has excellent electromagnetic wave shielding performance at the contact portion between the shield members and that has excellent durability against repeated engagement and disengagement.

A shield material connection structure according to the present invention is a connection structure between a first shield material and a second shield material having electromagnetic wave shielding properties, wherein the first shield material includes a conductive first contact portion and a first hook-and-loop fastener. The second shield material has a conductive second contact portion and a second hook-and-loop fastener, and when the first hook-and-loop fastener and the second hook-and-loop fastener are joined, the conductive first contact portion and the conductive second It is characterized by having a pressing means that brings two contact parts into contact with each other and produces a mutual adhesion force therebetween.

Here, the shielding material refers to a cloth-like material used for the purpose of shielding electromagnetic waves.
Fabrics used as shielding materials include those made by weaving chemical fibers and ultra-fine metal threads like cloth, chemical fibers wrapped with ultra-thin metal foil, and metal-plated fibers on the market. You can use the fabric that is used.
Further, the hook-and-loop fastener used in the present invention is one in which a plurality of hooks raised on one side and a plurality of loops raised on the other side are made to be mutually engageable and detachable, and are used as fasteners for clothing and various daily necessities. .
Therefore, in the present invention, the first surface fastener and the second surface fastener refer to a pair of surface fasteners having hooks formed on one side and loops formed on the other side.

In the conductive hook-and-loop fasteners described in Patent Documents 1 and 2, etc., the plating is peeled off due to repeated engagement and disengagement of locking and releasing, and the reliability of the shield connection is reduced. and the second shield material are provided with conductive first and second contact portions that are in contact with each other, and in addition to the conductive contact portions to maintain or improve the contact force, mutually engageable and detachable surfaces are provided. It has a fastener.
That is, when the first hook-and-loop fastener provided on one shield member and the second hook-and-loop fastener provided on the other shield member are engaged with each other, the first conductive contact portion and the second conductive contact portion are separated. A mutual pressing force is applied to improve the adhesion.
In the present invention, the first hook-and-loop fastener and the second hook-and-loop fastener are composed of a plurality of mutually arranged loops and a plurality of hooks, and the conductive first contact portion and the conductive second contact portion are composed of the plurality of loops. or between the plurality of hooks.
In this way, the conductive contact portion can be formed integrally with the hook-and-loop fastener.

The adhesion force between the conductive first contact portion and the conductive second contact portion can be improved simply by providing a pair of hook-and-loop fasteners near the contact portions, and the mutual pressing force acts. In the pressing means, the conductive first contact portion and the conductive second contact portion are connected to each other by having joint portions made of hook-and-loop fasteners on both sides of the conductive first contact portion and the conductive second contact portion. A tensile force may act on the first shielding material and the second shielding material in a direction in which the first shielding material and the second shielding material are in close contact with each other. An elastic member is provided on one or both of the back sides, and when the hook-and-loop fasteners are joined together, the elastic pressure of the elastic member causes the conductive first contact portion and the conductive second contact portion to come into close contact with each other. A force may act.

In the connection structure of the shield material according to the present invention, since the hook-and-loop fastener having a pair of loops and hooks raised is provided in addition to the conductive contact portions, the hook-and-loop fastener ensures reliability in repeated engagement and disengagement. Therefore, the connection reliability between the shield members is also improved by the conductive contact portion.

An example of a connection structure according to the present invention is shown, (a) before connection and (b) after connection. A second embodiment is shown. (a) shows before connection, and (b) shows after connection. A third embodiment is shown. An example in which the connection structure according to the present invention is applied to a shield box is shown. (a) shows the state in which the outer flap is spread as shown in FIG. 5, (b) shows the state in which the outer flap is locked to the outside of the inner flap, and (c) shows the opening and closing member (second Shield material) is lifted up. FIG. 5 shows a sectional view taken along line CC of FIG. 4; (a) to (c) show examples in which a conductive contact portion is formed integrally with a hook-and-loop fastener.

An example of the shield material connection structure according to the present invention will be described below with reference to the drawings.
FIG. 1 shows a structural example of a connecting portion between a first shield material 10 and a second shield material 20 as a first embodiment.
The conductive first contact portion (conductive fabric) 13 provided on the first shield material 10 and the conductive second contact portion (conductive fabric) 23 provided on the second shield material 20 are closely connected to connected.
In order to secure the adhesion of this part, in this first embodiment, an elastic material 24 such as a cushion material is arranged on the back side of the conductive second contact portion 23, and the first hook-and-loop fastener (A ) 11, a fastener (A) portion of a second surface fastener (A) 21, and a fastener (B) portion of a first surface fastener (B) 12 and a second surface fastener (B) 22. be.
FIG. 1(b) shows a state in which the fastener (A) portion and the fastener (B) portion of the first shield material 10 and the second shield material 20 are engaged.
As a result, the second conductive contact portion 23 is pressed against the first conductive contact portion 13 by the repulsive force of the elastic member 24, so that the adhesion is improved and the reliability of electrical connection is improved.

FIG. 2 shows an example in which loops 13a and 23a made of raised conductive fibers are brought into close contact with each other by elastic force instead of the cushioning material used in the first embodiment.
As the loop used here, it is preferable to use a loop in which a very thin metal tape is wrapped around the chemical fiber, or a loop in which a very fine metal thread and the chemical fiber are woven.
Such a loop is difficult to peel off unlike plating.

FIG. 3 shows an example in which line fasteners (16, 26) and hook-and-loop fasteners are combined as a third embodiment.
In this embodiment, the first shielding material 10 and the second shielding material 20 can be opened and closed by mutual line fasteners (16, 26). is provided.
An elastic member 24 is arranged inside the flap 25 and on the back side of the second conductive contact portion 23, and both sides thereof can be engaged and disengaged by a fastener (A) portion and a fastener (B) portion made of hook-and-loop fasteners. This is an example.

FIG. 4 shows an example in which the connection structure according to the present invention is applied to the shield box 1, and FIG. 5 shows a sectional view taken along line CC.
As shown in FIGS. 5 and 4(c), a wire fastener 26 is provided on the outer periphery of the second shield material 20 so that the second shield material 20 can be opened and closed by bending in the vertical direction, and a first fastener forming a box. A line fastener 16 attached to the opening of the shield material 10 is connected by fasteners.
An inner flap 25a is provided so as to overlap the peripheral edge of the opening of the first shield material 10 from the outer periphery of the second shield material 20, and an outer flap 15 is formed along the opening of the first shield material 10. .
An elastic member 24 is arranged inside the tip of the inner flap 25a, and a second hook-and-loop fastener 21a is attached to the outside of the inner flap 25a on the opening side of the elastic member 24. is attached with the first hook-and-loop fastener 11a.
As a result, the first conductive contact portion 13 is pressed against the frame member 1a of the shield box 1, and the repulsive force of the elastic member 24 is used to move the second conductive contact portion 23 to the first conductive contact portion. It can be brought into close contact with the portion 13 .
In this case, it is preferable to pull the outer flap 15 to lock the first hook-and-loop fastener 11a to the second hook-and-loop fastener 21a.
Since the connecting portion of the wire fastener (16, 26) is covered with the conductive inner flap 25a, the shielding performance of this portion is also high.

FIG. 6 shows an example in which the functions of a conductive contact portion and a hook-and-loop fastener are integrated.
As shown in FIG. 6A, the hook-and-loop fastener provided facing the first shield material 10 and the second shield material 20 has a loop 21b made of pile on one side and a hook 11b made of pile on the other side. Forming causes them to disengage from each other.
FIG. 6A shows an example in which a first conductive contact portion 13a and a second conductive contact portion 23a made of conductive fibers are provided between the hook 11b and the loop 21b so as to face each other.
The conductive fibers may be ultra-fine metal wires, elastic chemical fibers such as polyethylene wound with ultra-fine metal threads or ultra-thin metal foils, or carbon fibers.
6(b) and (c) show a modification of (a).
(b) is an example of using a combination of (loop 11c, hook 11b) and (loop 21b, hook 21c) for each hook-and-loop fastener, and (c) is a mushroom-shaped male portion 13b made of metal and a loop 21b and loop 23a are engaged and disengaged.
Thus, the reliability of electrical connection is improved by forming conductive contact portions between the hooks and loops that constitute the conventional hook-and-loop fastener.

10 First shield material 11 First hook-and-loop fastener (A)
11b hook 11c loop 12 first surface fastener (B)
13 Conductive first contact portion 13b Male portion 15 Outer flap 20 Second shield material 21 Second hook-and-loop fastener (A)
21b loop 21c hook 22 second surface fastener (B)
23 conductive second contact portion 24 elastic member 25 flap 25a inner flap

Claims (4)

A connection structure between a first shield material and a second shield material having electromagnetic wave shielding properties,
The first shield material has a conductive first contact portion and a first hook-and-loop fastener,
The second shield material has a conductive second contact portion and a second hook-and-loop fastener,
When the first hook-and-loop fastener and the second hook-and-loop fastener are joined, the first conductive contact portion and the second conductive contact portion are brought into contact with each other, and a pressing means is provided to generate a mutual adhesion force therebetween. connection structure of the shielding material. The first hook-and-loop fastener and the second hook-and-loop fastener comprise a plurality of mutually arranged loops and a plurality of hooks, and the conductive first contact portion and the conductive second contact portion are located between the loops or between the loops. 2. The connecting structure of the shielding material according to claim 1, wherein the connecting structure of the shield material is erected from between the plurality of hooks. The pressing means has connecting portions made of hook-and-loop fasteners on both sides of the first conductive contact portion and the second conductive contact portion, respectively, so that the first conductive contact portion and the second conductive contact portion are mutually connected. 2. The connecting structure of shielding materials according to claim 1, wherein a tensile force acts on the first shielding material and the second shielding material in a direction in which the first shielding material and the second shielding material are in close contact with each other. The pressing means has an elastic member on the back side of one or both of the first conductive contact portion and the second conductive contact portion, and when the hook-and-loop fasteners are joined to each other, the elastic pressure of the elastic member is increased. 4. The connection structure of the shielding material according to claim 1, wherein a contact force acts in a direction in which the conductive first contact portion and the conductive second contact portion are brought into close contact with each other.

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