JP4732205B2 - Electromagnetic shielding gasket mounting structure - Google Patents

Description

  The present invention relates to an electromagnetic shielding gasket used for preventing leakage of electromagnetic waves due to a gap formed between a door frame and a door of an electromagnetic shielding room.

  An MRI (magnetic resonance imaging) inspection apparatus and the like are installed in an electromagnetic wave shield room in order to eliminate leakage of electromagnetic waves from the MRI inspection apparatus and influence of external electromagnetic waves.

[Necessity of gasket]
The electromagnetic shielding room is equipped with doors for entering and exiting. The gap between the door frame and the door of the electromagnetic shielding room is a cause of electromagnetic leakage, so use a shielding member to prevent leakage. I have to.

[Types of shield members]
Conventional shield members include shield fingers that utilize the elasticity of metal plate pieces such as beryllium copper alloy, copper, and stainless steel, and elastic materials such as neoprene rubber and urethane foam as core materials. There is a shield gasket with a metal mesh on the surface. A hollow type shield gasket made of beryllium copper alloy wire as shown in FIG. 5 has also been proposed. This is a shield gasket that utilizes the spring property of the beryllium copper alloy and has high resilience (Patent Document 1).

[Attaching the shield member]
The shield member is attached to the shield room or the like using a shield finger, by screwing (Patent Document 2), or by using a finger rail on which the shield finger can be slid (Patent). Reference 3). In addition, the adhesive structure using the double-sided adhesive tape (Patent Document 4) and the gasket having the attachment portion are attached by screwing.

US Patent 5,294,270 (Heat-treated wire-mesh EMI / RFI shielding gasket) JP-A-06-275978 (shield gasket fixing structure) JP-A-10-284868 (Finger rail structure) JP-A-11-004094 (Electromagnetic wave shielding gasket and manufacturing method thereof: page 4, FIG. 4)

  As described above, conventionally, a gasket, which is a shield member, is attached to a door or the like by fixing with a screw or using a double-sided adhesive tape or an adhesive. In addition, in the method of attaching to the metal groove, it took time and effort to install the shield gasket, such as the need to groove the door, etc., and the need for a groove forming member, resulting in a complicated structure. In addition, when a shield member (shield gasket) has been used for a long time, it will be time-consuming to replace it when it has deteriorated or damaged. With the double-sided tape method, the adhesive residue is removed. And there is a problem that it is difficult to completely remove the residue.

  An object of the present invention is to provide a gasket mounting structure in which a shield gasket can be easily mounted and replaced without using an adhesive or a screw.

In order to solve the above-mentioned problems, the invention described in claim 1 of the present invention has an electromagnetic wave shielding gasket having a mesh-like surface constituted by a conductive member and a joint portion of a plurality of mushroom-like protrusions. It consists of a gasket holding member . When the electromagnetic shielding gasket is pressed against the gasket holding member, the joints of the mushroom-like protrusions are connected by being caught on the mesh-like surface and removed by peeling, and the electromagnetic shielding gasket holds the gasket It is characterized by being detachable from the member.

According to a second aspect of the present invention, in the electromagnetic wave shielding gasket mounting structure according to the first aspect , both ends are arranged along the longitudinal direction between the gasket holding member and the mounted body on which the gasket mounting structure is installed. A conductive mounting plate member having a bent shape on the gasket holding member side is provided.

  According to the electromagnetic wave shield gasket mounting structure of the first aspect of the present invention, the shield gasket can be easily attached and detached without impairing the electromagnetic wave shielding effect, and the mounting portion is beautifully finished. Further, the present invention is not limited to sliding doors, and can be applied over a wide range as a simple mounting structure of shield gaskets at joints of hinged doors, windows, shutters, and panels. The mounting plate member can improve the electrical continuity between the gasket and the mounted body and further improve the electromagnetic wave shielding effect.

  In the invention described in claim 2, in addition to the same effects as in the invention described in claim 1, the mounting plate member of the shield gasket is used as a part of the component from the time of manufacturing each component such as a door and a door frame Since it can be built in, no adjustments are required on site, and the shield gasket can be installed accurately and easily according to the design drawing, so the following effects can be obtained.

  In the factory manufacturing process, the mounting plate member can be accurately mounted at a predetermined position by welding or screwing. Moreover, it is easy to attach the gasket holding member to the bottom portion of the mounting plate member, and accuracy can be expected in the mounting. At the site, it can be installed by simply pressing the shield gasket against the gasket holding member, and can be replaced by peeling it off by hand. Subsequent repairs can be done in a very short time. On-site contractors can achieve a beautiful finish without requiring special skills. As a result, the line of the fitted shield gasket is straight and the height is uniform, so that the construction according to the design drawing can be finished. Therefore, the best electromagnetic shielding effect can be expected.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an example of an electromagnetic shielding gasket mounting structure according to this embodiment. In this figure, 10 is an electromagnetic shielding gasket having a mesh-like surface that is attached to the door or door frame of the electromagnetic shielding room to shield the electromagnetic wave, and 20 is a gasket for attaching and holding the electromagnetic shielding gasket. It is a holding member.

〔gasket〕
An electromagnetic shielding gasket 10 used in the electromagnetic shielding gasket mounting structure of the present invention is shown in FIG. This electromagnetic wave shielding gasket 10 is an electromagnetic wave shielding gasket having a tubular wire-mesh structure in which a metal wire is knitted. In the present embodiment, as shown in the figure, the cross section is circular in a natural state where no force is applied. However, the cross section is not necessarily circular, and an ellipse, a rectangular shape, or other polygonal shapes can be applied. It is an electromagnetic shielding gasket with a structure that is made by braiding thin metal wires into a mesh shape, and is rich in elasticity and resilience. The material is preferably a material having a high spring property such as a beryllium copper alloy or stainless steel. For example, a shielding product manufactured by Instrument Specialties may be used.

[Gasket holding member]
A gasket holding member 20 used in the electromagnetic wave shielding gasket mounting structure of the present invention is shown in FIG. As an example, the structure is a fastener in which mushroom-like stems (engagement / locking members) 201 protrude from an olefin resin, and has about 170 to 400 stems 201 per 25.4 mm square. In this product, the mushroom-shaped stem 201 is usually engaged by pressing the fasteners together, and can be repeatedly attached and detached as necessary. In the present invention, this fastener is used as a holding member for the electromagnetic shielding gasket.

  A conductive material is optimal for enhancing the electromagnetic shielding effect. An insulating material such as plastic can also be used. In this case, a metal mounting plate member, which will be described later, may be used as an auxiliary member in order to enhance the shielding effect. This holding member has a pressure-sensitive adhesive tape on the back surface, and thereby the holding member is attached to a member to be mounted (a door, a door frame or the like). Specifically, it can be attached simply by peeling the release film and applying pressure from above. In addition, it is also possible to adopt an attachment method other than the adhesive tape, such as adhesive bonding, sewing, or staples. For example, a dual lock (TM) fastener manufactured by Sumitomo 3M Limited can be used.

[Removal of gasket]
In order to attach the shield gasket 10, the gasket mesh is engaged with the mushroom-like protrusion 201 formed on the surface of the holding member by pressing the gasket 10 against the gasket holding member 20. Further, when removing, it can be removed like a velvet fastener by simply peeling off the gasket 10, and no special tool is required, and replacement can be easily performed.

[Example of usage]
The electromagnetic wave shield gasket mounting structure of the present invention can be implemented in various forms as follows, and will be described with reference to the drawings.

[Use condition (Example 1) Lateral slide press]
FIG. 2 is an example showing a use state of the electromagnetic wave shielding gasket mounting structure of the present invention. This is used for electromagnetic shielding of sliding doors.

[Mounting plate member (auxiliary member)]
In this example, the mounting plate member 30 is used as an auxiliary member for more effectively implementing the electromagnetic wave shield described above. The mounting plate member 30 is a plate-like metal member disposed between the gasket holding member 20 and a door (contact plate) 400 or a door frame (gasket support plate) 410 on which the mounting structure of the present invention is mounted. , Are arranged with the same length as the gasket 10. As shown in the figure, it is preferable that both ends be bent upward along the longitudinal direction, and thereby, electrical conduction between the shield gasket 10 and the mounted body 410 such as a door frame is reliably achieved. be able to.

  In this state of use, when the door 400 is closed, a friction force is applied to the shield gasket by a part of the door or the attached (contact) plate along with the displacement, and the mounting plate member is rotated while rotating it. Crimp to the side. Further, when the door 400 or the like is opened, deformation due to excessive rubbing of the shield gasket 10 can be suppressed by the opposite side surface.

[Use condition (Example 2) Longitudinal flat plate crimping]
FIG. 3 shows another example of the usage state of the present invention. This is used for a shield facing the door 400 or the like. The electromagnetic wave shielding gasket 10 is compressed on the flat plate surface of the door 400 and is spread on the wall surface of the mounting plate member 30 to form an electromagnetic wave shield.

[Use condition (Example 3) Longitudinal protrusion plate pressure bonding]
In FIG. 4, the projection member 401 of the door is inserted into the electromagnetic shielding gasket 10, and this is spread on the wall surface of the mounting plate member 30 to form an electromagnetic shielding.
As described above, it can be used in various modes.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows one Embodiment of this invention, (A) is a side view, (B) is a front view, It is the figure notched partially. It is a figure which shows the use condition of the electromagnetic wave shield attachment structure of this invention. It is a figure which shows the other example of the use condition of the electromagnetic wave shield attachment structure of this invention. It is a figure which shows the other example of the use condition of the electromagnetic wave shield attachment structure of this invention. It is a perspective view which shows the electromagnetic wave shielding gasket used by this invention. It is a perspective view which shows the gasket holding member used by this invention.

Explanation of symbols

10 Electromagnetic shielding gasket 20 Gasket holding member 30 Mounting plate member 400 Door (contact plate)
410 Door frame (gasket support plate)

Claims (2)

It consists of an electromagnetic shielding gasket having a mesh-like surface made of a conductive member and a gasket holding member having a joint portion of a plurality of mushroom-like protrusions. By pressing the electromagnetic shielding gasket against the gasket holding member, a mushroom shape An electromagnetic wave shield gasket mounting structure, characterized in that the joint portion of the projection is coupled by being caught on a mesh-like surface, is removed by peeling, and the electromagnetic wave shield gasket is detachable from the gasket holding member.
2. The electromagnetic wave shielding gasket mounting structure according to claim 1, further comprising a shape in which both ends are bent toward the gasket holding member side along the longitudinal direction between the gasket holding member and the mounted body on which the gasket mounting structure is installed . An electromagnetic wave shielding gasket mounting structure comprising a conductive mounting plate member.

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