JP4343784B2 - Conductive member - Google Patents

Description

  The present invention relates to a conductive member.

Conventionally, a conductive member having a structure in which a net-like conductor is provided around a core material has already been proposed (see, for example, Patent Document 1 below).
JP-A-2-296396

  However, since the conventional conductive member described in Patent Document 1 is in a state in which the mesh conductor is completely exposed to the outside of the core material, the material forming the mesh conductor is a material that easily oxidizes. In the case of oxidization, there is a problem that rust is generated or the conductivity is lowered with oxidation.

  For such problems, the present inventors have exposed only a part of the mesh conductor to the surface of the core material, and other parts are embedded in the core material, so that the part embedded in the core material. The contact with outside air was cut off, and it was thought that this could suppress the oxidation of the network conductor. In the case of such a configuration, in order to maximize the conductive performance of the mesh conductor, it is desirable that the part contacting the interstitial part is desirably exposed to the core surface, while the interstitial part is exposed. In order to suppress oxidation of the network conductor, it is considered preferable to bury the portion that does not come into contact with the core material as much as possible.

  However, it is practically impossible to accurately determine the portion that contacts the interposed portion and the portion that does not contact at the stage of manufacturing the conductive member. Therefore, normally, in order to fully exhibit the conductive performance of the network conductor, the network conductor must be excessively exposed on the surface of the core material, including the portion that is not actually in contact with the intervening location. It was difficult to suppress the oxidation of the spot.

  That is, it is not difficult to increase the range of the mesh conductor embedded in the core material itself, but if the mesh conductor is embedded in the core material excessively, the core is made up to the portion that becomes a contact point with the interposition site. There is a risk of being buried inside the material, and in that case, the conductive performance of the network conductor is reduced by the amount of decrease in the number of contacts with the intervening locations. Therefore, in order to avoid a decrease in the conductive performance of the network conductor, the network conductor has to be excessively exposed on the surface of the core material.

  The present invention has been made to solve the above problems, and its purpose is to reliably expose the portion in contact with the intervention site to the surface of the core material to maximize the performance of the network conductor. In addition, an object of the present invention is to provide a conductive member capable of suppressing the oxidation of the net-like conductor by burying the portion that does not come into contact with the intervening portion inside the core material.

The characteristic configuration employed in the present invention will be described below.
The conductive member of the present invention is
Consists of an elastically deformable core material and a net-like conductor provided around the core material, and when sandwiched between the first member and the second member, fills the gap between the two members A conductive member for electrically connecting both members,
The network conductor is provided on the outer periphery of the core material, and then melts the surface layer of the core material with heat, so that in a non-pressurized state, a part of the mesh conductor is buried in the core material, der which a part is in a state exposed to the core material surface is,
The core material, when sandwiched between the front Symbol first member and the second member, part bulges to the outer surface side of the mesh conductor exits the mesh of the mesh conductor It is formed of a gel-like resin material, and as the bulging portion wraps a part on the outer surface side of the mesh conductor, the portion buried in the core material is increased. Features.

  In this conductive member, as the mesh conductor, for example, a wire woven by crossing a wire equivalent to warp and a wire equivalent to a weft, or a knitted wire knitted by a knitting method such as knitting is used. Can do. Moreover, if it has a structure that can be regarded as a net-like structure, the net-like conductor can be formed of a material other than a wire. For example, a network conductor may be formed by connecting a large number of rings. The shape of the mesh is arbitrary, and may be anything such as one having a square mesh, one having a hexagonal mesh, or one having an irregular mesh.

  Moreover, this mesh-like conductor may be formed in a mesh shape in advance, and may be wound around the core material, or may be formed while winding a wire around the core material. For example, in the case of forming a net while winding a wire around a rod-shaped core material, one or more wire rods are wound clockwise and another one or more wire rods are left-handed, and each is a spiral. When it is wound around the core material so as to draw, a net is woven on the surface of the core material. Further, the net may be knitted around the core material while passing the core material through the center of a knitting machine capable of continuously knitting a tubular net.

  As a material for constituting the network conductor, a material made of a metal or an alloy having low electrical resistance represented by copper or aluminum, a material made of carbon fiber, or a base material made of a non-conductive substance, A material in which a conductive layer (for example, a plating layer) made of a conductive material such as a metal is formed on the surface layer can be used.

  On the other hand, the core material is formed of a gel-like resin material. Gel resin material is a resin material that has a structure that includes a fluid component in the gap between the three-dimensional network structure formed by the molecular chains of the base polymer. is there.

  The base polymer may be any polymer that does not cause any inconvenience in forming a gel-like resin material. Typical examples thereof include various thermoplastic elastomers such as styrene, ester, amide, and urethane. , As well as hydrogenated products and other modified products, or styrene, ABS, olefin, vinyl chloride, acrylate ester, methacrylate ester, carbonate, acetal, amide, halogenated poly Examples thereof include thermoplastic resins such as ether-based, halogenated olefin-based, cellulose-based, vinylidene-based, vinylbutyral-based, and alkylene oxide-based materials, and rubber-modified products of these resins. These may be used alone or in combination of two or more as long as they are compatible with each other.

  The flowable component may be any component that does not cause inconvenience in forming the gel-like resin material, but usually a liquid or liquid material is suitably used at room temperature. More specifically, for example, various softeners for rubber or resin can be used, and any hydrophilic or hydrophobic softener can be used as long as it is compatible with the base polymer. However, any type of softening agent such as mineral oil, vegetable oil, or synthetic oil may be used. These fluid components may be used alone or in combination of two or more as long as the compatibility is good.

The hardness of the gel-like resin material is such that when the conductive member is sandwiched between the first member and the second member, a part of the core material passes through the mesh of the mesh conductor and the mesh conductor It is adjusted so as to have a hardness (hardness) enough to bulge to the outer surface side of the. Specific numerical values indicating the hardness, but may also vary in relation to the size of the mesh of the mesh conductor, as a guideline, for example, when there is a hardness of Asker FP hardness 0.1 desirable. This is because when the Asker FP hardness is less than 0.1, a large amount of softening agent is added, so that the compression set tends to increase. In addition, if the Asker FP hardness exceeds 100, it will not be possible to compress it to the intended state unless a larger pressure is applied when it is sandwiched between the intervention parts. Is not preferred. The Asker FP hardness is a hardness that can be measured by an Asker FP type hardness meter manufactured by Kobunshi Keiki Co., Ltd. JIS A hardness of “JIS K6253” is known as one of the standards related to relatively general hardness, but the Asker FP hardness is a low-hardness material in which it is difficult to obtain a measured value having a significant difference with JIS A hardness. It is a standard that is used when measuring the hardness.

  The hardness of the gel resin material can be set to a desired hardness by appropriately adjusting the blending ratio of the base polymer and the fluid component. Specifically, as the amount of the fluid component increases, the gel resin material has a desired hardness. Since the hardness decreases, the blending ratio of the two may be adjusted to a desired hardness according to the combination of the selected base polymer and fluid component. As an example, for example, when the gel-like resin material is obtained by blending 50 to 2000 parts by weight of a hydrocarbon-based process oil as a softening agent with respect to 100 parts by weight of a styrene block copolymer. It is possible to obtain a low-hardness gel-like resin material suitable for use in the above. In addition, in a gel-like resin material, you may give or improve a flame retardance, electroconductivity, damping property, etc. by adding various additives and fillers as needed.

  The core material made of such a gel-like resin material is molded so as to have a form according to the purpose. For example, when it is inserted in a specific part, it is processed by a known molding method (for example, injection molding, extrusion molding, etc.) so as to have a shape suitable for the specific part. Moreover, if the core is formed into a columnar or prismatic shape, it can be cut into a general-purpose product that can be used as necessary.

  Moreover, the length of the core material can be arbitrarily set from a relatively short to a long one. When the conductive member is formed of a long core material, for example, the conductive member can be suitably used as a conductive gasket. Specifically, if a conductive gasket, which is a long conductive member, is arranged so as to surround the opening along the periphery of the opening of the housing, the conductive material will be conductive when the opening is closed with a lid. The gap between the casing and the lid can be filled with the property gasket, and the casing and the lid can be electrically connected. By providing such a conductive gasket, electromagnetic waves can be prevented from leaking out of the housing through the gap between the housing and the lid, and electromagnetic waves coming from outside the housing can be prevented from entering the gap between the housing and the lid. Can be prevented from entering into the casing. On the other hand, even if the core material is not long, it can be used as, for example, a conductive part such as a ground contact, and both parts are electrically connected by sandwiching them between two parts that are not directly electrically connected. Can be connected to. As a more specific example, when two printed wiring boards are arranged in parallel, the conductive member of the present invention is sandwiched between the two printed wiring boards to electrically connect them. Therefore, if only one printed wiring board is grounded, the other printed wiring board can be grounded.

  Further, in this conductive member, the net-like conductor is in a state where a part thereof is buried in the core material and the other part is exposed on the surface of the core material in an unpressurized state. In the invention, it is sufficient to secure a sufficient portion exposed on the surface of the core material. If the portion exposed on the surface of the core material is sufficiently secured, the mesh conductor will surely come into contact with the interstitial site, and the conductive performance of the mesh conductor will be maximized. Can do.

  In addition, if the portion that is exposed on the core material surface is sufficiently secured, it will be exposed to the core material surface up to the place that does not actually contact the interstitial site, in the case of the present invention, When the conductive member is sandwiched between the interposed portions, a part of the core material passes through the mesh of the mesh conductor and bulges to the outer surface side of the mesh conductor, and this bulged portion is a gap between the interposed portion and the mesh conductor. In the form of entering, a part of the outer surface side of the net-like conductor is wrapped, and the portion buried in the core material is increased. At this time, the location where the outer surface side is encased by the bulging portion of the core material is a location where a gap exists between the location and the interstitial site, so that this is electrically connected to the interstitial location. There is no place. On the contrary, since there is no gap in which the bulging portion of the core material enters in the place in contact with the intervening location, such a location will not be buried in the core material.

  In other words, in the conductive member of the present invention, even when the portion exposed to the core material surface is sufficiently secured, when the conductive member is sandwiched between the interposed portions, useless exposed portions Is buried in the core.

  Therefore, according to the conductive member of the present invention, the portion in contact with the intervention site can be reliably exposed to the surface of the core material, and the performance of the mesh conductor can be maximized. About the part which does not contact, when it pinches | interposes in an intervention location, it is made to embed dynamically in the inside of a core material, and, thereby, the oxidation of a net-like conductor can be suppressed.

As mentioned above, although the electroconductive member of this invention was demonstrated, it is preferable in this invention that the following structures are employ | adopted further.
First, after the net-like conductor is provided on the outer periphery of the core material, the surface layer of the core material is melted by heat so that a part of the mesh conductor is buried in the core material in an unpressurized state. Good thing.

  In the conductive member having such a structure, a net-like conductor is provided on the outer periphery of a core material formed of a gel-like resin material, and then the core material and the net-like conductor are passed through a heated die to heat the surface layer of the core material. And a part of the mesh conductor is buried in the core material.

With the conductive member having such a structure, a structure in which a part of the conductive material is buried in the core material can be formed relatively easily.
Further, the contact surface of the core member that comes into contact with each member when sandwiched between the first member and the second member is a convex surface in which the central portion swells to the outer surface side than the peripheral portion. It is preferable.

  In the case of the conductive member having such a structure, when the conductive member is sandwiched between the first member and the second member, the contact range is set to the periphery after the central portion comes into contact with each member. Since it expands to a part, it becomes difficult to pinch air between each member and a core material, and the adhesiveness of each of the first and second members and the conductive member can be further improved.

Next, an embodiment of the present invention will be described with an example.
As shown in FIG. 1, the conductive member 1 has a structure in which a net-like conductor 5 is provided on the outer periphery of a core material 3.

Core member 3 has been formed by the gel-like resin material, in this embodiment, the gel-like resin material for styrene block copolymer 100 parts by weight, 50 to 2000 parts by weight softener The blended hydrocarbon process oil is used. Further, the process oil contained in the gel-like resin material also functions as a rust preventive that suppresses oxidation of the surface of the network conductor 5 when attached to the surface of the network conductor 5.

  The net-like conductor 5 is formed by winding a plurality of metal wires around the core material 3 in a spiral manner, half of which is right-handed and half of which is left-handed. Are alternately crossed so as to overlap from above, forming a net-like structure.

  In addition, in the non-pressurized state, the net-like conductor 5 has a part (the part indicated by a broken line in FIG. 1) buried in the core material 3 and the other part (a solid line in FIG. 1). The portion shown) is exposed on the surface of the core material 3. In such a structure, first, a net-like conductor 5 is provided on the outer periphery of the core material 3, and a die having a through hole having substantially the same shape as the cross-sectional shape of the core material 3 and the net-like conductor 5 is heated, The core material 3 and the net-like conductor 5 are passed through this die, the surface layer of the core material 3 is melted by heat, and a part of the inner surface side of the net-like conductor 5 is buried in the core material 3 continuously. Can be manufactured.

  As shown in FIG. 2A, each of the plurality of wires constituting the mesh conductor 5 is bent so as to wave in the thickness direction of the mesh conductor 5, and the conductive member 1 is connected to the first member 11. Before being sandwiched between the second member 12 (that is, in an unpressurized state), a portion that is convex toward the outer surface side of the core material 3 (hereinafter referred to as a convex portion) is the core. A concave portion that is exposed on the surface of the material 3 and is between the convex portions is buried in the core material 3.

On the other hand, when the conductive member 1 is sandwiched between the first member 11 and the second member 12, the plurality of wires constituting the reticulated conductor 5 are cores as shown in FIG. The portion buried in the material 3 increases. This is because the core member 3 is formed of a gel-like resin material such as described below.

  More specifically, for example, FIG. 3A shows a state in which the conductive member 1 is sandwiched between the first member 11 and the second member 12 as shown in FIG. 2A and FIG. FIG. 6 is an enlarged cross-sectional view showing the moment when the vicinity of the portion A indicated by an arrow contacts the first member 11. At this time, the mesh conductor 5 is a part of the portion exposed on the surface of the core member 3. 5 a contacts the first member 11, and a gap 17 is formed between the other part 5 b and the first member 11.

  However, for example, when the cut surface indicated by the line BB in FIG. 3A is viewed, the moment when the mesh conductor 5 contacts the first member 11 (the moment when the state shown in FIG. 3A is reached). ), There is a gap 17 between the mesh conductor 5 and the first member 11 (see the left side of FIG. 3B), but when the conductive member 1 is further pressurized. When a part of the core material 3 passes through the mesh of the mesh conductor 5 and bulges to the outer surface side of the mesh conductor 5 (see the center diagram in FIG. 3B), and the conductive member 1 is further pressurized. Eventually, the bulging portion wraps around the outer surface side of the mesh conductor 5, and the bulging portion fills the gap 17 between the mesh conductor 5 and the first member 11. As a result, the mesh conductor 5 is embedded in the core material 3 in an unpressurized state as shown in FIG. 4A (see the left side of FIG. 3B). Will also increase when the pressure is reached (see the diagram on the right side of FIG. 3B).

  In this way, the range embedded in the core material 3 due to the pressurization is a portion where the gap 17 exists between the net-like conductor 5 and the first member 11, and the first member 11. It is a place which is not electrically connected to. On the contrary, since there is no gap 17 in which the bulging portion of the core material 3 enters in the range electrically connected to the first member 11, such a location is inside the core material 3. It will never be buried in the water. That is, with this conductive member 1, even when the portion exposed on the surface of the core material 3 is sufficiently secured, the conductive member 1 is wasted when the conductive member 1 is sandwiched between the interposed portions. The exposed portions are buried in the core material 3.

  Therefore, according to the conductive member 1, the portion contacting the interposition location can be reliably exposed on the surface of the core material 3, and the performance of the net-like conductor 5 can be maximized. About the part which does not contact a location, at the time of being pinched | interposed into the intervention location, it is made to embed dynamically in the inside of the core material 3, and thereby, the oxidation of the net-like conductor 5 can be suppressed.

  Note that, as described above, the conductive member 1 is configured such that the gap 17 dynamically disappears with the contact with the intervention location, so that the air in the clearance 17 is sandwiched between the intervention locations. It is preferable that the escape place is not lost and the contact of the core member 3 that contacts each of the members 11 and 12 when sandwiched between the first member 11 and the second member 12 is achieved. As shown in FIG. 4B, the surface is a convex surface in which the central portion swells outward from the peripheral portion (the surface in which the central portion swells by the height C shown in FIG. 4B). And preferred.

  With such a conductive member, when the conductive member is sandwiched between the first member 11 and the second member 11, the central portion contacts the members 11 and 12, and then the contact Since the range expands to the peripheral portion, it becomes difficult to sandwich air between the members 11 and 12 and the core material 3, and the adhesion between the first and second members 11 and 12 and the conductive member. Can be further improved.

As mentioned above, although embodiment of this invention was described, this invention is not limited to said specific one Embodiment, In addition, it can implement with a various form.
For example, in the above embodiment, the mesh conductor 5 is woven so as to intersect a plurality of metal wires. However, for example, as in the mesh conductor 21 shown in FIG. A metal wire knitted by the above knitting method may be used, or a metal wire connected like a mesh conductor 23 shown in FIG. 5B may be used. These network conductors 21 and 23 also have a limited contact point with an intervening place because wires and rings have a three-dimensional structure in the thickness direction of each network conductor. Since the portion that does not come into contact with the mounting portion is encased by the core material bulging from the inside, this prevents the reticulated conductor 5 from being oxidized.

The perspective view of the electroconductive member illustrated as embodiment of this invention. The fragmentary sectional view of the said electroconductive member. FIG. 3 is an enlarged cross-sectional view near the portion A shown in FIG. 2. (A) is the figure which looked at the surface of the electroconductive member, and is a figure which shows the change of the embedded part of a net-like conductor, (b) made the convex part which the center part of the core material swelled to the outer surface side rather than the peripheral part. FIG. The figure which shows the modification of a net-like conductor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Conductive member, 3 ... Core material, 5, 21, 23 ... Reticulated conductor, 11 ... 1st member, 12 ... 2nd member.

Claims (3)

Consists of an elastically deformable core material and a net-like conductor provided around the core material, and when sandwiched between the first member and the second member, fills the gap between the two members A conductive member for electrically connecting both members,
The network conductor is provided on the outer periphery of the core material, and then melts the surface layer of the core material with heat, so that in a non-pressurized state, a part of the mesh conductor is buried in the core material, der which a part is in a state exposed to the core material surface is,
The core material, when sandwiched between the front Symbol first member and the second member, part bulges to the outer surface side of the mesh conductor exits the mesh of the mesh conductor It is formed of a gel-like resin material, and as the bulging portion wraps a part on the outer surface side of the mesh conductor, the portion buried in the core material is increased. A conductive member. The contact surface of the core member that comes into contact with each member when sandwiched between the first member and the second member is a convex surface in which the central portion swells outward from the peripheral portion. The conductive member according to claim 1 . A net-like conductor is provided on the outer periphery of the core material formed of the gel-like resin material, and the core material and the net-like conductor are passed through a heated die to melt the surface layer of the core material by heat, and A method for producing a conductive member, comprising: embedding a part in the core.

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