KR100245629B1 - Conductive gasket manufacturing method for electromagentic shielding - Google Patents

Abstract

A cushioning material having a rectangular cross-sectional shape is processed into a predetermined size and attached to the upper side of the support, and then pulls both widthwise ends of the conductive cover coated with a liquid adhesive on the inside to fix the adhesive to the support to fix the square cross-sectional shape of the cushioning material. After deforming to a shape and then heating the conductive cover, the liquid adhesive melts and adheres to the hemispherical cushioning material to complete the conductive gasket. Accordingly, the manufacturing process can be simplified and the manufacturing cost can be lowered because a separate processing step for forming a hemispherical cross-sectional shape of the sponge is not required.

Description

Manufacturing method of conductive gasket for hemispherical electromagnetic shielding

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The present invention relates to a conductive gasket structure for electromagnetic shielding and a method for manufacturing the same, and more particularly, to a conductive gasket structure capable of preventing leakage or intrusion of electromagnetic waves in various joints or connecting portions of a device, and a method for manufacturing the same. will be.

In response to the development of the electronic communication industry and the establishment of the information society, modern home appliances, industrial electronic devices and information communication devices are required to be downsized, have high processing capacity, and have low power consumption. More devices were installed in the space. As a result, it is gradually placed in an environment susceptible to propagation noise, and various measures have been taken to solve this problem.

The main parts of the device to which electromagnetic waves leak and penetrate include a connection part of the device, a cable, a transparent display panel, and a connector connection part. Among them, to shield the electromagnetic wave generated from the cable, shield or ground the cable itself, and use twisted wires or cores inside the cable as much as possible. In addition, in order to shield the electromagnetic waves leaking to the transparent display panel, the transparent display panel is manufactured by using a transparent insulating material such as acrylic, and a metal fabric mesh and a conductive mesh are embedded in the transparent display panel, or a conductive material is transparent on one side of the transparent display panel. By deposition.

In such a part, although electromagnetic wave shielding is possible to some extent, shielding in the connection part of an apparatus is not easy enough.

The electromagnetic shielding at the connection part of the device is mainly performed to prevent outside radio waves from entering the inside of the device through the atmosphere or to prevent leakage of the electromagnetic waves generated inside the device to the outside. In order to maximize the shielding of the electromagnetic wave at the connection part of the device, it is optimal to design it seamlessly, but it is impossible to make it seamless at the connection part of the device. Therefore, electromagnetic chipping or leakage at the connection part of the device is inevitable and a conductive gasket is used to prevent this.

For example, a device incorporating various electronic devices is usually formed as a door having a transparent window at the front thereof, so that the operation state of the electronic devices can be examined. In this case, the electromagnetic waves emitted from the transparent window of the door can be shielded by using a transparent display panel incorporating the above-described metal fabric mesh or the like, and the electromagnetic waves at the connection portion between the door and the main body of the door can provide a conductive gasket. To shield.

1 is a cross-sectional view of a conductive gasket conventionally used.

As shown, the entire sponge 3 is surrounded by the conductive cover 1 with an adhesive 2 and bonded. Next, the double-sided adhesive agent 5 is attached to the bottom surface to complete the conductive gasket 10.

The conductive gasket 10 having such a structure is attached to the front inner side 20 of the body main body 30 as shown in FIG. 2A. Therefore, when the door (not shown) formed on the front part is closed, the door and the main body of the device are electrically connected by the conductive cover 1 surrounding the conductive gasket 10 and at the same time, they are completely brought into close contact with each other. To shield the electromagnetic waves from intrusion. At this time, the sponge 3 formed inside the conductive gasket serves to tightly close the door and the rack body by being crimped when the door is closed with a cushioning material.

Also, as shown in FIG. 2B, a conductive gasket 10 is installed along the outer periphery of the computer body 50. As shown in FIG. Therefore, when the main body is closed using the conductive case 40, the computer main body 50 and the conductive case 40 may be electrically connected to shield leakage of electromagnetic waves generated inside the computer.

However, the conductive gasket having a sponge having a rectangular cross section inside requires a lot of force to be pressed when the door is closed because the upper surface contacting the door is flat, and the compressive force is not evenly transmitted as a whole, so that partial leakage of electromagnetic waves occurs. This may occur. In addition, when the door is closed at the hinge portion to which the door and the mechanism body are connected, the inner portion of the door is pushed while pressing the upper edge of the conductive gasket, thereby repeating the deformation of the conductive gasket. In addition, even when the computer cover is frequently opened and closed, the conductive case is pushed while pressing the upper edge of the conductive gasket, and thus the shape of the conductive gasket is deformed.

In order to solve this problem, a conductive gasket having a structure as shown in FIG. 3 is used. That is, the cross-sectional shape of the sponge of the conductive gasket is changed to hemispherical shape, and the material and shape of the other parts are the same. In the case of shielding using the conductive gasket 10 having such a structure, since the contact area is small as the apex of the hemisphere and the contact area is small, the compressive force is small, and accordingly, the airtight crimp is sufficiently performed even by the small force. In addition, since the contact area is contacted in an increasing manner, the compressive force is evenly transmitted so that no partial leakage occurs.

However, hemispherical sponges used in such conductive gaskets had to be manufactured by molding or extruding to hemispherical shapes from the beginning. However, in order to mold or extrude the hemispherical sponge 6, it was possible to use a material of a certain density or more. In other words, it is impossible to extrude a sponge of low density, and thus, a sponge having a hemispherical cross section could not be made. Therefore, there is a problem in that a lot of force is required to compress the door when closing the door, compared to a conventional sponge having a low density cross section.

In addition, in order to manufacture such a hemispherical sponge has to go through a separate processing process there is a problem that the manufacturing process is complicated and the manufacturing cost increases.

SUMMARY OF THE INVENTION The object of the present invention is to solve such problems of the prior art, and a method for manufacturing a conductive gasket with a simple process and a low manufacturing cost that does not require much force and does not cause partial electromagnetic leakage when used. To provide.

1 is a cross-sectional view of a conventional conductive gasket using a square cross-section sponge,

2 is a state diagram used in the general conductive gasket,

3 is a cross-sectional view of a conventional conductive gasket using a sponge having a hemispherical cross section,

4 is a manufacturing process diagram of the conductive gasket according to the present invention.

<Description of the symbols used in the main parts of the drawing>

1: conductive cover 2: adhesive

3: sponge 4: support

5: double sided adhesive 6: hot melt adhesive

According to the invention, the step of processing a cushioning material having a rectangular cross-sectional shape to a predetermined size; Attaching a cushioning material on the upper side of the support; Applying a liquid adhesive to the inside of the conductive cover; Pulling both ends in the width direction of the conductive cover and adhering the support to deform the rectangular cross-sectional shape of the cushioning material into a hemispherical shape; Disclosed is a method of manufacturing a conductive gasket for electromagnetic shielding, comprising heating the conductive cover.

And preferably attaching the double sided tape over the conductive cover attached to the underside of the support. Also preferably, the liquid adhesive comprises a hot melt and the cushioning material comprises any one sponge selected from the group consisting of foamed polyurethane sponges, foamed silicone sponges, foamed neoprene sponges and thermoplastic elastomer sponges.

Also preferably the support comprises PVC or polyethylene, and the conductive cover comprises a cloth which is conductive by weaving electroless metal plating on polyester fiber, nylon fiber or nonwoven fabric.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

4 diagrammatically shows a process for making the conductive gasket of the present invention.

First, the sponge 3 of a general rectangular cross section is appropriately processed to meet a desired standard (FIG. 4A). The sponge 3 acts as a cushioning material and is used by a foamed polyurethane sponge, a silicone sponge, a neoprene sponge, or a thermo plastic elastomer sponge. do.

Subsequently, the upper surface of the support 4 such as PVC or polyethylene processed to fit the width of the sponge is attached via a normal adhesive (FIG. 4B). At this time, the width of the support can be the same or slightly smaller than the width of the sponge, if the cross-sectional shape of the gasket can be larger than the width of the sponge in the case of P shape or dumbbell shape. In addition, the support itself can be made into a fastener shape or a clip shape according to the characteristics of the site where the conductive gasket is installed.

Next, a liquid adhesive is applied to the inside of the conductive cover 1 (Fig. 4C). Preferably, a hot melt adhesive is used as the liquid adhesive. The magnitude | size of the width | variety of an electroconductive cover is sufficient as it is a grade for transforming the cross-sectional shape of a rectangular sponge to hemispherical shape in the process mentioned later. In the conductive cover 1, preferably, a conductive cloth obtained by electroless metal plating of copper (Cu), copper-nickel (Cu + Ni) or silver (Ag) on a polyester or nylon cloth is used.

Subsequently, the conductive cover 1 and the sponge 3 having a rectangular cross-sectional shape are pushed into a mold (not shown) in which a hemispherical space is formed at the same time in the direction of the arrow, and the both ends of the conductive cover 1 are pulled in the width direction with a predetermined tool. The rectangular cross-sectional shape of the sponge 3 is deformed into hemispherical shape (FIG. 4D). At this time, the both ends of the conductive cover may overlap, may be exactly fit or some distance.

In this state, the conductive cover 1 is heated (Fig. 4E). At this time, since the hot melt is coated on the inner surface of the conductive cover, the inner sponge 3 and the conductive cover 1 are bonded to each other while melting by heating.

Finally, the double-sided tape 5 is attached onto the conductive cover 1 on the lower side of the support base to complete it (FIG. 4F). As the double-sided adhesive tape 5, a conventional adhesive tape or a conductive double-sided adhesive tape is used. Preferably the width of the double-sided adhesive tape is less than or equal to the width of the support. In this case, when the support itself is made into a fastener shape or a clip shape according to the characteristics of the site where the conductive gasket is installed, since the double-sided tape does not need to be used, this step can be omitted.

The conductive gasket of the present invention manufactured as described above does not need to be processed separately so that the sponge has a hemispherical cross-sectional shape as in the prior art. That is, since the cross-sectional shape of the inner sponge is deformed from a square shape to a hemispherical shape automatically by the support and the conductive cover during the process of attaching the conductive cover, no separate processing step is required. Accordingly, the manufacturing process is simplified and the manufacturing cost is lowered because the time and cost required for separate processing can be reduced.

As described above, according to the present invention, since a separate processing step for forming a hemispherical cross-sectional shape of the sponge is not required, the manufacturing process may be simplified and the manufacturing cost may be lowered.

Claims (6)

Processing the cushion member having a rectangular cross-sectional shape to a predetermined size; Attaching the cushion material on the upper side of the support; Applying a liquid adhesive to the inside of the conductive cover; Pulling both ends in the width direction of the conductive cover and adhering to the support to deform the rectangular cross-sectional shape of the cushion material into a hemispherical shape; Method of manufacturing a conductive gasket for electromagnetic shielding comprising the step of heating the conductive cover. The method of claim 1, further comprising attaching a double-sided tape on the conductive cover attached to the lower side of the support. The method of manufacturing a conductive gasket for electromagnetic wave shield according to claim 1, wherein the liquid adhesive comprises hot melt. The conductive gasket for electromagnetic shielding according to claim 1, wherein the cushioning material comprises any one sponge selected from the group consisting of a foamed polyurethane sponge, a foamed silicone sponge, a foamed neoprene sponge, and a thermoplastic elastomer sponge. Manufacturing method. The method of manufacturing a conductive gasket for electromagnetic wave shield according to claim 1, wherein the support comprises PVC or polyethylene. The method of manufacturing a conductive gasket for electromagnetic shielding according to claim 1, wherein the conductive cover comprises a cloth having conductivity by weaving by electroless metal plating on polyester fiber, nylon fiber or nonwoven fabric.

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