JP2009032925A - Gasket for electromagnetic shielding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gasket for electromagnetic shielding capable of providing good electromagnetic shielding characteristics without compression and reducing manufacturing cost. <P>SOLUTION: The gasket 1 for electromagnetic shielding includes a core material 2 formed from an elastic foamed material into a post having a rectangular cross section, and a sheet-like conductive covering material 4 which is fitted around the side surface of the core material 2 through a both-sided tape 3. The both-sided tape 3 is respectively pasted on the surfaces corresponding to the major sides of the rectangular cross section of the core material 2, and no tape is pasted on the surfaces corresponding to the minor sides thereof. The conductive covering material 4 is so fitted as to enclose, from the outer periphery, the core material 2 except for the central portion of one both-sided tape 3. The gasket 1 for electromagnetic shielding can be fixed to a conductive case or the like, not shown in figure, through the both-sided tape 3 exposed from the gap of the conductive covering material 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electromagnetic wave shielding gasket that shields electromagnetic waves that try to pass through a gap between conductors, for example.

Conventionally, as this type of electromagnetic wave shielding gasket, a conductive coating material is applied to the outer peripheral surface of a core material made of an elastic material via an adhesive layer such as a double-sided adhesive tape (hereinafter referred to as double-sided tape). Things have been proposed. Further, in this type of electromagnetic shielding gasket, a double-sided tape is further attached to the outer peripheral surface of the conductive coating material, and the electromagnetic shielding gasket is fixed to a conductive housing or the like by the double-sided tape (for example, , See Patent Document 1).
Japanese Patent No. 2801180

  However, when the electromagnetic shielding gasket is fixed by the double-sided tape provided on the surface of the conductive coating material as described above, the electromagnetic shielding gasket is compressed to bring the conductive coating material into contact with the conductive casing or the like. I have to let it. In conventional gaskets for electromagnetic wave shielding, for example, sufficient electromagnetic wave shielding properties cannot be obtained only by compressing about 10%, and there are some gaskets that need to be compressed about 20%. Further, when a fixing double-sided tape is attached to the surface of the conductive coating material, the number of parts and the number of manufacturing steps increase, and the manufacturing cost also increases. Accordingly, an object of the present invention is to provide an electromagnetic wave shielding gasket which can obtain good electromagnetic wave shielding properties without being compressed and can reduce the manufacturing cost.

  The invention according to claim 1, which has been made to achieve the above object, is a gasket for electromagnetic wave shielding formed by depositing a conductive coating material on an outer peripheral surface of a core material made of an elastic material via an adhesive layer, The conductive coating material is applied to the outer peripheral surface of the core material leaving a part of the outer peripheral surface of the core material, and the adhesive material is also applied to the outer peripheral surface of the core material exposed from the gap of the conductive coating material. The gist of the present invention is an electromagnetic shielding gasket characterized in that a layer is provided.

  In the present invention configured as described above, the conductive coating material is applied to the outer peripheral surface of the core member through the adhesive layer while leaving a part of the outer peripheral surface, and is exposed from the gap between the conductive coating materials. The adhesive layer is also provided on the outer peripheral surface (hereinafter referred to as an exposed surface) of the core material. For this reason, the gasket for electromagnetic wave shielding can be fixed to a conductive housing or the like via the adhesive layer provided on the exposed surface. Here, since the adhesive layer is provided on the core side of the conductive coating material, when the electromagnetic wave shielding gasket is fixed to the conductive housing or the like in this way, the conductive coating is fixed by the fixing. The material comes into contact with the conductive housing or the like. For this reason, the electromagnetic wave shielding gasket of the present invention can provide good electromagnetic wave shielding properties without being compressed. In addition, in the electromagnetic wave shielding gasket of the present invention, it is not necessary to separately provide a double-sided tape for fixing to a conductive housing or the like, so that the manufacturing cost can be reduced by reducing the number of parts and the number of manufacturing steps.

  The invention according to claim 2 made to achieve the above object is characterized in that a conductive coating is applied to the outer peripheral surface of the adhesive layer, leaving a part of the outer peripheral surface of the adhesive layer. The gist of the gasket for electromagnetic shielding is as follows.

  Even in the present invention configured as described above, the electromagnetic shielding gasket can be fixed to a conductive casing or the like through the adhesive layer exposed from the gap of the conductive coating material. Here, since the adhesive material layer is provided on the inner side of the conductive coating material, when the electromagnetic shielding gasket is fixed to the conductive housing or the like in this way, the conductive coating material is fixed by the fixing. Contact the conductive housing. For this reason, even with the electromagnetic wave shielding gasket of the present invention, good electromagnetic wave shielding properties can be obtained without compression. In addition, in the electromagnetic wave shielding gasket of the present invention, it is not necessary to separately provide a double-sided tape for fixing to a conductive housing or the like, so that the manufacturing cost can be reduced by reducing the number of parts and the number of manufacturing steps.

  When the core material is used as in the first aspect of the invention, it becomes easy to control the compression performance (low resilience, high resilience, etc.) of the electromagnetic shielding gasket. On the other hand, when the core material is not provided as in the second aspect of the invention, the electromagnetic shielding gasket can be easily bent and can be easily fixed to a curved surface such as a conductive housing. .

[First Embodiment]
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a configuration of an electromagnetic shielding gasket 1 as a first embodiment of the present invention. As shown in FIG. 1, the electromagnetic shielding gasket 1 includes a core material 2 formed into a columnar shape having a rectangular cross section by an elastic foam material (for example, a member in which chloroprene, polyurethane, or the like is formed in a sponge shape). A sheet-like conductive coating material 4 is provided around the side surface of the core material 2 via a double-sided tape 3 as an adhesive layer. As the conductive coating material 4, various materials such as a metal foil, a wire mesh, a metal-plated cloth, or a film material made of a synthetic resin and a metal layer can be applied.

  As shown in FIG. 1, the double-sided tape 3 is attached to the surface corresponding to the long side of the rectangular cross section of the core material 2, and is not attached to the surface corresponding to the short side of the rectangular cross section. And the conductive coating | covering material 4 is adhere | attached so that the center part of one double-sided tape 3 may be left and the core material 2 may be surrounded from outer periphery. A release paper 5 is attached to the surface of the double-sided tape 3 exposed from the gap between the conductive coating materials 4.

  The electromagnetic shielding gasket 1 configured as described above is a conductive casing (not shown) that peels off the release paper 5 and the electromagnetic shielding gasket 1 through the double-sided tape 3 exposed from the gap of the conductive coating material 4. Etc. can be fixed. Here, since the double-sided tape 3 is provided closer to the core material 2 than the conductive coating material 4, when the electromagnetic shielding gasket 1 is fixed to the conductive housing or the like in this way, it is electrically conductive by the fixing. The conductive covering material 4 comes into contact with the conductive casing or the like. For this reason, the electromagnetic wave shielding gasket 1 can provide good electromagnetic wave shielding properties without being compressed. In addition, since the electromagnetic shielding gasket 1 does not need to be provided with a double-sided tape for fixing to the conductive casing or the like, the number of parts and the number of manufacturing steps can be reduced to reduce the manufacturing cost.

  Further, in the electromagnetic shielding gasket 1, the conductive coating material 4 is not attached to the core material 2 at the portion facing the short side of the rectangular cross section of the core material 2. For this reason, even when the electromagnetic shielding gasket 1 is compressed, the conductive coating material 4 is gently bent outward without being bent inside the core material 2, so that the conductive coating material 4 is deteriorated. There is no. Further, since both ends in the circumferential direction of the conductive covering material 4 are not fixed to each other, the electromagnetic shielding gasket 1 can be displaced in the direction indicated by the arrow in FIG. It can suppress adding.

Further, in the electromagnetic shielding gasket 1, the core material 2 is formed by laminating a plurality of foam materials, or by constituting a laminated structure of the foam material and a double-sided tape. Compression performance such as repulsion and high repulsion can be adjusted according to the application. Furthermore, if a double-sided tape 3 that is easy to peel off is used, the core material 2 and the conductive coating material 4 can be easily separated after use, and the recyclability can be improved. Furthermore, even if the width of the double-sided tape 3 exposed from the gap between the conductive coating materials 4 is wide, the conductive coating material 4 can be satisfactorily brought into contact with the conductive housing or the like as described above. The fixing strength of the gasket 1 can also be ensured.
[Second Embodiment]
FIG. 2 is a cross-sectional view showing a configuration of an electromagnetic wave shielding gasket 11 as a second embodiment of the present invention. As shown in FIG. 2, the electromagnetic wave shielding gasket 11 is formed by covering the outer peripheral surface of an adhesive layer 13 formed by forming a gel-like adhesive material in a columnar shape with a conductive coating material 14 while leaving a part of the outer peripheral surface. It is composed by wearing. As the conductive coating material 14, various materials such as a metal foil, a wire mesh, a metal-plated cloth, or a film material made of a synthetic resin and a metal layer can be applied. A release paper 15 is attached to the surface of the pressure-sensitive adhesive layer 13 exposed from the gap between the conductive coating materials 14.

  The electromagnetic shielding gasket 11 configured as described above is a conductive casing (not shown) that peels off the release paper 15 and uses the adhesive layer 13 exposed from the gap of the conductive coating material 14 to expose the electromagnetic shielding gasket 11. Etc. can be fixed. Here, since the adhesive layer 13 is provided on the inner side of the conductive coating material 14, when the electromagnetic shielding gasket 11 is fixed to the conductive housing or the like in this way, the conductive coating material is fixed by the fixing. 14 contacts a conductive housing or the like. For this reason, the electromagnetic wave shielding gasket 11 can provide good electromagnetic wave shielding properties without being compressed. In addition, the electromagnetic shielding gasket 11 does not need to be provided with a double-sided tape for fixing to the conductive housing or the like, so the number of parts and the number of manufacturing processes can be reduced to reduce the manufacturing cost.

Further, since the electromagnetic shielding gasket 11 does not have a core material, the electromagnetic shielding gasket 11 can be easily bent and can be easily fixed to a curved surface such as a conductive casing. . Further, since both ends in the circumferential direction of the conductive coating material 14 are not fixed to each other, the electromagnetic shielding gasket 11 can be displaced in the direction indicated by the arrow in FIG. It can suppress adding.
[Other embodiments]
The present invention is not limited to the above embodiments, and can be implemented in various forms without departing from the gist of the present invention. For example, the present invention may be one in which a conductive coating material such as a metal foil is applied leaving a part around the double-sided tape. In this case, the base material of the double-sided tape corresponds to the core material, and the adhesive applied to the double-sided tape corresponds to the adhesive layer. In this case, a so-called base-less double-sided tape having no base material may be used. In this case, bending can be facilitated similarly to the electromagnetic wave shielding gasket 11 of the second embodiment. it can.

  Furthermore, in the electromagnetic wave shielding gasket 1 of the first embodiment, the conductive coating material 4 is not attached to the core material 2 at the portion facing the short side of the rectangular cross section of the core material 2. The covering material 4 may be attached over the entire circumference of the core material 2. Further, in the electromagnetic shielding gasket 1 of the first embodiment, the surface corresponding to the short side of the rectangular cross section of the core material 2 is not attached to the conductive coating material 4, and the surface corresponding to the long side is attached. However, in the case where the cross-section of the core material is vertically long, the surface corresponding to the short side may be attached and the surface corresponding to the long side may not be attached.

  Furthermore, the edge which opens the said clearance gap of the conductive coating | covering material 4 and opposes may be cut linearly, and may be cut by the serrated shape. Moreover, in the electromagnetic wave shielding gasket 1, if a double-sided tape 3 having vibration damping properties is used, the electromagnetic wave shielding gasket 1 can be given vibration damping properties.

It is sectional drawing showing the structure of the gasket for electromagnetic wave shielding of 1st Embodiment. It is sectional drawing showing the structure of the gasket for electromagnetic wave shielding of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 ... Electromagnetic wave shielding gasket 2 ... Core material 3 ... Double-sided tape 4, 14 ... Conductive coating material 5, 15 ... Release paper 13 ... Adhesive layer

Claims (2)

An electromagnetic shielding gasket formed by attaching a conductive coating material to an outer peripheral surface of a core material made of an elastic material via an adhesive layer,
The conductive coating material is applied to the outer peripheral surface of the core material leaving a part of the outer peripheral surface of the core material,
The gasket for electromagnetic wave shielding, wherein the adhesive layer is also provided on the outer peripheral surface of the core material exposed from the gap between the conductive coating materials.   A gasket for electromagnetic wave shielding, comprising a conductive coating on the outer peripheral surface of the adhesive layer, leaving a part of the outer peripheral surface of the adhesive layer.

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