JP6815822B2 - Thermally conductive gasket - Google Patents

Description

INDUSTRIAL APPLICABILITY According to the present invention, in an electronic device, a heat conductive gasket capable of providing cushioning properties to a gap between electric conductors and a gap between an electric conductor and a ground substrate to electrically stably conduct electricity and dissipate heat. Regarding.

In electronic devices such as mobile phones and personal computers, conductive gaskets are used to conduct conduction while providing cushioning properties to gaps between electric conductors and gaps between electric conductors and a ground substrate. The conductive gasket is composed of, for example, a rectangular parallelepiped cushion main body, a conductive film covering the cushion main body, and a double-sided adhesive tape for sticking the cushion main body and the conductive film.
In addition, some of the conductive gaskets also have a function of dissipating heat from electronic components. For example, it is described in Japanese Patent Application Laid-Open No. 2013-242989.
Further, in order to ensure good heat conduction, a graphite sheet is attached to the cushion body.

Japanese Unexamined Patent Publication No. 2013-242989

However, although the one described in Patent Document 1 can secure electrically stable conduction, there is a slight problem in heat dissipation as compared with the one using a graphite sheet.
On the other hand, the one using the graphite sheet is superior to the one described in Patent Document 1 in heat dissipation, but has a problem that a short circuit accident is likely to occur.
Since the graphite sheet has a property that the end face is easily peeled off, the end face of the graphite sheet exposed during use is liable to peel off and cause a short circuit accident.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a thermally conductive gasket that can secure electrically stable conduction and does not cause a short circuit accident.

The thermoconductive gasket according to the present invention is a thermally conductive gasket that is sandwiched between a first conductor and a second conductor to ensure continuity between the two conductors.
A first surface, a second surface facing the first surface, a first side surface connecting the first surface and the second surface, and a second side surface facing the first side surface. A cushion body having a rectangular cross-sectional view and
A first double-sided adhesive tape that covers the entire surface of the first surface, the entire surface of the first side surface, and the entire surface of the second surface so that the end surface faces the second side surface side .
A graphite sheet that is attached to the entire surface of the first double-sided adhesive tape and has an end face facing the second side surface side together with the first double-sided adhesive tape .
An insulating film that covers the entire surface of the graphite sheet and faces the end face toward the second side surface side together with the first double-sided adhesive tape and the graphite sheet .
The entire surface of the insulating film covering the first surface, a part of the insulating film covering the second surface , the second side surface, and the end surface of the first double-sided adhesive tape facing the second side surface side. , A conductive film that covers the end face of the graphite sheet facing the second side surface side and the end face of the insulating film facing the second side surface side .
It is provided with a second double-sided adhesive tape that is attached to a portion of the second surface that is not covered with the conductive film.

Further, the conductive film is coated with an adhesive on the back surface side.
Further, the insulating film is coated with an adhesive on the back surface side.

Since the thermoconductive gasket according to the present invention uses a graphite sheet, it has excellent heat dissipation. Moreover, since the end face of the graphite sheet is covered with the conductive film, it does not peel off and does not cause a short circuit accident.
Further, since this thermoconductive gasket has a cushion body in the center, the first conductor and the second conductor can be reliably connected to each other, so that electrically stable conduction is also ensured. be able to.

It is a schematic sectional drawing of the heat conductive gasket which concerns on embodiment of this invention. It is a schematic cross-sectional view which shows the state which attached the thermal conductive gasket which concerns on embodiment of this invention to a 2nd conductor. It is a schematic cross-sectional view which shows the state which sandwiched the heat conductive gasket which concerns on embodiment of this invention by a 1st conductor and a 2nd conductor.

The thermoconducting gasket 1000 according to the embodiment of the present invention is a thermoconducting gasket that is sandwiched between a first conductor and a second conductor to ensure continuity between the two conductors.
The thermoconductive gasket 1000 is a first side surface 130 connecting the first surface 110, the second surface 120 facing the first surface 110, and the first surface 110 and the second surface 120. And the cushion body 100 having a rectangular cross-sectional view having the first side surface 130 and the second side surface 140 facing the first side surface 130.
A first double-sided adhesive tape 200 that covers the entire surface of the first surface 110, the entire surface of the first side surface 130, and the entire surface of the second surface 120 so that the end surface faces the second side surface 140 side .
A graphite sheet 300 that is attached to the entire surface of the first double-sided adhesive tape 200 and has an end face facing the second side surface 140 side together with the first double-sided adhesive tape 200 .
An insulating film 400 that covers the entire surface of the graphite sheet 300 and faces the end face toward the second side surface 140 side together with the first double-sided adhesive tape 200 and the graphite sheet 300 .
The entire surface of the insulating film 400 covering the first surface 110, a part of the insulating film 400 covering the second surface 120, the second side surface 120, and the first facing the second side surface 140 side. A conductive film 500 covering the end face of the double-sided adhesive tape 200, the end face of the graphite sheet 300 facing the second side surface 140 side, and the end face of the insulating film 400 facing the second side surface 140 side .
It includes a second double-sided adhesive tape 600 that is attached to a portion of the second surface 120 that is not covered with the conductive film 500.

The cushion body 100 is made of a flexible and insulating material such as urethane.
The cushion body 100 is formed in a thin flat plate shape having a rectangular shape in a plan view, the largest surface is the first surface 110, and the surface facing the first surface 110 is the second surface 120. There is. The first side surface 130, which is one side surface connecting the first surface 110 and the second surface 120, is a second side surface 140 which is the other side surface connecting the first surface 120 and the second surface 120. Facing.

The first double-sided adhesive tape 200 extends from the first surface 110 of the cushion body 100 to the second surface 120 across the first side surface 130. That is, the first double-sided adhesive tape 200 covers all but the second side surface 140, the front surface and the back surface of the cushion body 100.
As the first double-sided adhesive tape 200, for example, a PET film having a thickness of 10 μm coated with an acrylic adhesive on both sides is used.

The graphite sheet 300 is attached to the entire surface of the first double-sided adhesive tape 200. As a result, the first double-sided adhesive tape 200 is entirely covered with the graphite sheet 300.
The graphite sheet 300 ensures the heat dissipation of the thermoconductive gasket 1000.
A graphite sheet 300 having a thickness of 25 μm is used.

The entire surface of the graphite sheet 300 is covered with the insulating film 400. The insulating film 400 is a PET film coated with an acrylic adhesive only on one side (back side).
As the insulating film 400, a film having a thickness of 10 μm is used.

The end faces of the first double-sided adhesive tape 200, the graphite sheet 300, and the insulating film 400, which are sequentially laminated on the first surface 110, the first side surface 130, and the second surface 120 of the cushion body 100, are the cushion body 100. It is exposed in a laminated state on the second side surface 140 of the above.
Since the graphite sheet 300 has excellent thermal conductivity but is easily peeled off, the graphite sheet 300 has a problem that it is peeled off from the exposed end face in this state.
The conductive film 500 described below solves this problem.

The conductive film 500 includes the entire surface of the insulating film 400 laminated on the first surface 110 and a portion of about 1/2 which is a part of the insulating film 400 laminated on the second surface. And the entire surface of the insulating film 400 that covers the second side surface 140.
Therefore, the second side surface 140 of the cushion body 100 is covered with the conductive film 500 together with the exposed end faces of the first double-sided adhesive tape 200, the graphite sheet 300, and the insulating film 400.
As a result, the problem of peeling from the end face of the graphite sheet 300 covered with the conductive film 500 can be avoided.

For the conductive film 500, a conductive cloth tape having a thickness of 35 μm, in which an acrylic adhesive is applied only to one side (back side), is used. Such a conductive cloth tape is composed of a ester yarn and a nickel-plated copper fiber.
The conductive film 500 ensures the conductivity of the thermoconductive gasket 1000 according to the embodiment of the present invention.

A second double-sided adhesive tape 600 is attached to a portion not covered by the conductive film 500, that is, an insulating film 400 located on the first side surface 130 side of the cushion body 100.
As the second double-sided adhesive tape 600, as in the case of the first double-sided adhesive tape 200, for example, a PET film having a thickness of 10 μm coated with an acrylic adhesive on both sides is used.

The thermoconducting gasket 1000 configured in this way is attached to the second conductor 800 by the second double-sided adhesive tape 600. Then, the conductive film 500 is brought into close contact with the second conductor 800.
At this time, as shown in FIG. 2, the thermally conductive gasket 1000 is provided with the conductive film 500 due to the difference between the thickness dimension of the second double-sided adhesive tape 600 and the thickness dimension of the conductive film 500. The side is attached to the second conductor 800 in a state of being slightly displaced from the side on which the second double-sided adhesive tape 600 is provided to the anti-second conductor 800 side.

In this state, as shown in FIG. 3, the first conductor 700 is pressed against the opposite side of the heat conductive gasket 1000, that is, from the first surface 110 side of the cushion body 100. As a result, the first conductor 700 and the second conductor 800 are conducted through the conductive film 500.
At the same time as this conduction, the gap between the first conductor 700 and the second conductor 800 is absorbed by the heat conductive gasket 1000.
Further, assuming that the first conductor 700 is a ground substrate conducted to the ground and the second conductor 800 is mounted with a heat generating component (not shown), the heat from the heat generating component is passed through the thermoconducting gasket 1000. It is transmitted to the first conductor 700 to dissipate heat, and the ground of the second conductor 800 is also secured.
That is, since the cushion body 100 having flexibility exists at the center of the heat conductive gasket 1000 and the graphite sheet is used for heat dissipation, it is between the first conductor 700 and the second conductor 800. Conduction and heat dissipation can be reliably ensured while absorbing the gaps between the two.

In the above-described embodiment, the conductive film 500 is a conductive cloth tape having a thickness of 35 μm to which an acrylic adhesive is applied only to one side (back side), but the present invention is limited to this. It goes without saying that there is no such thing.
For example, a metal foil body such as a copper foil or an aluminum foil in which an acrylic adhesive is applied only on one side (back side), or an acrylic adhesive is applied only on one side (back side) and a metal thin film is formed on the front side. It may be a formed conductive film or a conductive film having an adhesive coated on the back surface side and impregnated with a conductive filler on the front surface side.
Needless to say, the adhesive is not limited to acrylic adhesives.

Further, in the above-described embodiment, the insulating film 400 is a PET film in which an acrylic adhesive is applied to only one side (the back side), but it goes without saying that the present invention is not limited thereto. Nor.
For example, another kind of polymer insulating film having an adhesive coated on the back surface side, for example, a polyethylene film, a polyimide film, or a polyethylene terephthalate film can be used as the insulating film 400.
Further, as the insulating film 400, a material having excellent insulating properties such as paper and rubber, which is not made of polymer (non-polymer), is molded into a film shape, and acrylic adhesive is applied only to one side (back side) thereof. It may be coated with an agent.
Needless to say, the adhesive is not limited to acrylic adhesives.

It goes without saying that the materials and dimensions of the members constituting the heat conductive gasket 1000 described above are examples, and the present invention is not limited thereto.

1000 Thermally conductive gasket 100 Cushion body 110 First surface 120 Second surface 130 First side surface 140 Second side surface 200 First double-sided adhesive tape 300 Graphite sheet 400 Insulating film 500 Conductive film 600 Second Double-sided adhesive tape 700 First conductor 800 Second conductor

Claims (5)

In a thermally conductive gasket that is sandwiched between a first conductor and a second conductor to ensure continuity between them.
A first surface, a second surface facing the first surface, a first side surface connecting the first surface and the second surface, and a second side surface facing the first side surface. A cushion body having a rectangular cross-sectional view and
A first double-sided adhesive tape that covers the entire surface of the first surface, the entire surface of the first side surface, and the entire surface of the second surface so that the end surface faces the second side surface side .
A graphite sheet that is attached to the entire surface of the first double-sided adhesive tape and has an end face facing the second side surface side together with the first double-sided adhesive tape .
An insulating film that covers the entire surface of the graphite sheet and faces the end face toward the second side surface side together with the first double-sided adhesive tape and the graphite sheet .
The entire surface of the insulating film covering the first surface, a part of the insulating film covering the second surface , the second side surface, and the end surface of the first double-sided adhesive tape facing the second side surface side. , A conductive film that covers the end face of the graphite sheet facing the second side surface side and the end face of the insulating film facing the second side surface side .
A thermally conductive gasket characterized by comprising a second double-sided adhesive tape attached to a portion of the second surface that is not covered with the conductive film. The heat conductive gasket according to claim 1, wherein the conductive film is coated with an adhesive material on the back surface side. The conductive film has a conductive cloth tape coated with an adhesive on the back surface side, a metal foil body coated with an adhesive on the back surface side, and an adhesive coated on the back surface side to form a metal thin film on the front surface side. The thermally conductive gasket according to claim 1, wherein the conductive film is either a conductive film coated with an adhesive on the back surface side or a conductive film impregnated with a conductive filler on the front surface side. The heat conductive gasket according to claim 1, 2 or 3, wherein the insulating film is coated with an adhesive on the back surface side. The insulating film is a polymer insulating film having an adhesive coated on the back surface side or a non-polymer insulating film having an adhesive coated on the back surface side. Claims 1, 2, 3 or 4 The heat conductive gasket described.

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