KR20160056374A - Heat radiation and insulation sheet and portable terminal equipment having the same - Google Patents

Abstract

The hybrid heat-dissipating single sheet of the present invention comprises: a heat-diffusing layer made of a metallic material having a first thermal conductivity so as to diffuse heat horizontally; And a heat insulating layer formed of a metal material having a second thermal conductivity lower than the first thermal conductivity so as to prevent heat from being transferred in a vertical direction, the heat insulating layer being laminated on one surface of the heat diffusion layer, It is possible to prevent the deterioration of the heat generating component by diffusing the heat and to prevent the heat generated from the heat generating component from being transmitted to other components.

Description

TECHNICAL FIELD [0001] The present invention relates to a hybrid heat-and-insulating sheet and a portable terminal equipped therewith.

The present invention relates to a heat dissipation sheet, and more particularly, to a heat dissipation sheet that dissipates and dissipates heat generated from a heat generating component of an electronic device by using a relatively inexpensive metal plate, And a portable terminal provided with the same.

2. Description of the Related Art In general, electronic devices such as computers, personal digital assistants, and communication devices can not dissipate excessive heat energy generated inside a device to the outside, which causes serious problems of after-image problems and system stability. These thermal energies shorten the life of the product, cause malfunctions and malfunctions, and, in severe cases, cause explosions and fires.

Particularly, portable electronic devices are slim and thin, and their performance is high, so that heat generated from various circuit components inside the device is quickly released to prevent various parts of the electronic device from being damaged by heat.

On the other hand, a portable terminal device such as a smart phone or the like has a temperature of a case which is grasped during use or contacted with a face or the like for a reason such as an uncomfortable feeling at the time of use and a low temperature image.

In addition, in the portable electronic device, various functions are integrated in the smartphone to achieve high performance, while being made super thin and light in weight. In addition, in order to reduce weight and material cost, a case made of a synthetic resin is used instead of a metal case. There is a problem that it is difficult to lower the heat inside the metal case since the metal case is not provided with a passage for discharging the heat generated inside the metal case to the outside.

Therefore, a large number of heat-radiating sheets are provided to radiate heat energy generated inside the electronic device to the outside.

As disclosed in Korean Patent Publication No. 10-0721462, a conventional heat-radiating sheet includes a thermally conductive metal plate and a sticky foam sheet formed on at least one surface of the metal sheet and having a cell formed therein as a foam structure And the adhesive foam sheet is formed of an adhesive mixture containing a pressure-sensitive adhesive and a cell-forming agent, and the pressure-sensitive adhesive is an acrylic resin, a silicone resin or a polyurethane resin, and the cell former is composed of a microspheres.

However, since the conventional heat radiation sheet is used by attaching a sticky foam sheet to the surface of the metal sheet, it is used for a slim portable electronic device requiring a thickness of at least 50 mu m as the thickness is 50 to 1000 mu m There is a difficult problem.

Korean Patent Laid-Open No. 10-2008-76761 (Patent Document 2) discloses a thermally conductive layer formed by a composition comprising an organic polymer and a thermally conductive filler, a thermal diffusion layer formed on the surface of the thermally conductive layer and formed by a metal material, A thermal diffusion sheet provided on the surface of the thermal diffusion layer and including a heat insulating layer formed by an electrically insulating material has been proposed.

A graphite sheet or a film is mainly used as a base material for heat dissipation. The graphite sheet is produced by thermally decomposing a polymer film, which has a problem of handling because it is so close to a single crystal and low in burst strength and tensile strength. In addition, when it is attached to a heat generating component using a point contact adhesive, there is a problem that the carbon crystal easily peels off from the bonding interface.

In order to solve this problem, there has been developed a technique of coating a radiating substrate layer of a metal component using graphite, but this technique is very expensive and increases the price of the product, thereby deteriorating the price competitiveness.

The inventors of the present invention have found that the above conventional heat radiation sheet has a problem in that it is slim and does not have a thermal diffusion and heat collecting or heat insulating function and therefore the metal material having low thermal conductivity has a large heat capacity, It is possible to realize both the heat dissipation and the heat insulating function while the thin metal sheet is laminated and laminated with two metal thin plates having a difference in thermal conductivity of more than a predetermined amount.

Patent Document 1: Korean Patent Registration No. 10-0721462 Patent Document 2: Korean Patent Laid-Open No. 10-2008-76761

The present invention has been conceived to solve the problems as described above. It is an object of the present invention to provide a heat dissipation sheet for a first metal plate having a high thermal conductivity by combining two metal plates having different thermal conductivities, The present invention provides a hybrid heat-and-insulating sheet and a portable terminal unit using the heat-insulating and heat-insulating sheet.

Another object of the present invention is to provide a hybrid heat-insulating sheet capable of enhancing product competitiveness by implementing a heat-radiating sheet that exhibits heat dissipation effect equal to or higher than that of graphite by hybridizing a metal plate having a relatively low cost without using expensive graphite, And a portable terminal equipped with the same.

In order to achieve the above object, the hybrid heat-dissipating single sheet of the present invention comprises a heat diffusion layer made of a metallic material having a first thermal conductivity so as to diffuse heat horizontally; And a heat insulating layer made of a metal material having a second thermal conductivity lower than the first thermal conductivity so as to prevent heat from being transferred in a vertical direction, the heat insulating layer being laminated on one surface of the heat diffusion layer.

The heat diffusion layer may be formed of a metal material having a thermal conductivity of 100 W / mK or more and made of any one of Al, Cu, Ag, Au, Tw, Zn, Mg,

The heat insulating layer may be made of a metallic material having a thermal conductivity of 20 W / mK or less, and the heat insulating layer may be made of any one of amorphous alloy, FeCrAl, nichrome alloy, and stainless steel.

The stainless steel may be one of SUS 304, SUS 430, and SUS 316.

The heat insulating layer may be an amorphous thin plate magnetic sheet made of a heat-treated amorphous ribbon. The amorphous thin plate magnetic sheet may use an amorphous alloy or a nanocrystalline alloy.

The hybrid heat-insulating and heat-insulating sheet of the present invention may further comprise an oxidation-preventing layer which is formed on the surface of the heat-diffusing layer to prevent oxidation of the heat-diffusing layer. The oxidation- Alternatively, the surface of the heat diffusion layer may be oxidized to form an oxide film.

The heat insulating layer and the heat diffusion layer may be bonded together using an adhesive or a double-sided tape, or may be bonded by diffusion bonding.

The hybrid heat-insulating and heat-insulating sheet of the present invention may further include an adhesive layer laminated on the other surface of the heat-diffusing layer. At this time, the adhesive layer may be a heat-sealable adhesive layer.

The heat-radiating adhesive layer may be formed of an adhesive material or a double-sided tape having thermal conductivity of an inorganic material type so that heat generated from the heat generating component can be quickly transferred to the heat diffusion layer. The adhesive layer may be a general thermally conductive adhesive tape or a thermally conductive adhesive sheet, and may be formed in the form of an inorganic porous nano-web by an electrospinning method.

When the pressure-sensitive adhesive layer is formed in the form of an inorganic ball nano-web, a thermally conductive metal such as Cu, Ag or Al, a carbon black (carbon black), a carbon nanotube (CNT) An adhesive material having a viscosity suitable for electrospinning may be prepared by mixing any one of graphene and conductive polymer (PDOT), a pressure-sensitive adhesive and a solvent, and then electrospinning the pressure-sensitive adhesive material.

Furthermore, the adhesive layer may be applied to a structure in which the adhesive layer is also laminated on the heat insulating layer and the adhesive layer is provided on both sides of the heat radiation sheet.

In addition, the hybrid heat-insulating sheet of the present invention may further include a heat-radiating coating layer on both sides or one side of the heat-dissipating layer and the heat-insulating layer exposed to the air to improve the thermal emissivity.

According to another aspect of the present invention, there is provided a hybrid heat-insulating / heat-insulating sheet comprising: a first metal plate having a high thermal conductivity; And a second metal plate laminated on the first metal plate and having a low thermal conductivity, wherein the first metal plate is made of a metal material having a thermal conductivity of 100 W / mK or more, and the second metal plate is a metal material having a thermal conductivity of 20 W / .

The hybrid heat-radiating and heat-insulating sheet of the present invention can be used, for example, inserted between a display and a bracket in a portable terminal, between an FPCB and an inner cover, and between an inner cover and a back cover.

As described above, in the present invention, the first metal plate having a large thermal conductivity is used as a thermal diffusion sheet, and the second metal plate having a small thermal conductivity is used as a heat insulating sheet by combining two metal plates having large thermal conductivity differences. It is possible to implement both the insulation function. Metal materials with low thermal conductivity can be used as excellent insulation materials because they have a high capacity to store the transferred heat without transferring the heat.

The present invention can improve the product competitiveness by implementing a heat-radiating sheet that exhibits heat radiation effect equal to or higher than that of graphite by hybridizing a metal sheet material which is relatively inexpensive without using expensive graphite.

Therefore, by applying the hybrid heat-insulating sheet of the present invention, it is possible to prevent the deterioration of the heat-generating component by rapidly diffusing the heat generated from the heat-generating component of the electronic device and to suppress the heat transfer to the outside of the electronic device, Can be kept below the specified temperature.

FIG. 1 is an exploded view schematically illustrating a portable terminal device to which a hybrid heat-and-insulating sheet according to the present invention is applied.
2 is a cross-sectional view of a hybrid heat-insulating and heat-insulating sheet according to a preferred embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. Definitions of these terms should be based on the content of this specification.

The term " sheet " used in the present invention is a term including both a sheet and a film, and is expressed as a sheet for the understanding of the invention. The terms " one side " and " other side " used in the present invention mean the direction or position in which the layers are stacked, and the meaning of " laminated on one side or the other side " To form the bonding surfaces directly, or to bond the layers by means of an adhesive (or a pressure-sensitive adhesive) or the like.

1, a portable terminal device 1, for example, a mobile communication terminal to which a hybrid heat-and-insulating sheet according to the present invention is applied includes a display 101 made of an OLED or LCD, a bracket 103, A component 104 includes a main PCB mounted on the FPCB 105 and an inner cover 106 and a back cover 109. The inner cover 106 includes a USIM case 107 and a micro memory case 108 are coupled.

A digitizer panel (not shown) may be included between the display 101 and the bracket 103 to implement an electronic pen function and a battery (not shown) may be included between the inner cover 106 and the back cover 109. [ .

In this portable terminal machine 1, for example, heat insulation is provided between the display 101 and the bracket 103, between the FPCB 105 and the inner cover 106, between the inner cover 106 and the back cover 109, The heat insulating sheet 100 is inserted to block the heat generated in the heat generating component from being transferred to other components.

Further, between the battery and the back cover 109, an antenna coil necessary for performing a wireless charging and an NFC function is disposed, and a shielding sheet for shielding a magnetic field is integrally attached to the back surface thereof. Accordingly, it is preferable that the shielding sheet provided on the back cover has an ultra-thin thickness of less than 50 mu m so as to block the transmission of heat generated from the battery to the user at the same time as the shielding of the magnetic field.

The heat-insulating sheet 100 of the present invention can be used as a heat-generating component such as an application processor, a power management integrated circuit (PMIC), a communication processor, And hot spots), thereby preventing generation of locally high heat, thereby preventing the heat generating components from being damaged by heat, and preventing the heat generated from the heat generating components from being transmitted to other components .

In general, the portable terminal device 1 can not perform forced convection of heat generated from its internal heat-generating components, and it is difficult to conduct the heat to the outside, and heat blocking is required from the upper and lower surfaces of the heat- Is mainly conducted by conduction which is transmitted without the flow of the medium.

The thermal conductivity (P) is the heat conductivity (P), simply called the conductivity, the energy delivered per unit time when Q is the energy delivered through the plate with the cold side on the hot side during time t , Can be expressed by the following Equation 1 according to the Fourier conduction law.

[Equation 1]

P = Q / t = kA (TH - TC) / L

Where L is the thickness of the sheet to which the heat is transferred, t is the thickness of the sheet to which the heat is transferred, t is the thickness of the sheet to which the heat is transferred, The time at which heat is transferred, k is the thermal conductivity.

As the area of the sheet (plate) to be delivered is wide and the temperature difference between the high temperature portion and the low temperature portion is large, the heat conductivity P becomes large. On the other hand, the thicker the sheet (plate) to be conveyed, the smaller the thermal conductivity.

k is a constant with respect to the material indicating the degree of heat transfer. Usually, wood, air, styrofoam, etc. have low conductivity of heat and heat conduction is not good. On the other hand, metals have free electrons, which transmit thermal kinetic energy, which leads to a higher conductivity of the heat and hence better thermal conduction.

Equation (1) is summarized in terms of thermal conductivity k.

&Quot; (2) "

k = Q L / t A (TH - TC)

A material with a high thermal conductivity (k) is a good thermal conductor, and a material with a low thermal conductivity (k) is a good thermal insulator, ie, an insulating material.

Most of the known insulation materials are organic insulation materials such as expanded polystyrene, foamed polyurethane, extruded expanded polystyrene and polyethylene. The rest are inorganic insulators such as glass wool and mineral wool. Recently, building insulation materials such as VIP (Vacuum Insulation Panels), GFP (Gas-Filled Panels) and aerogels have been developed. Most of these thermal insulation materials have been developed for architectural purposes and have low thermal conductivity but are not thin enough to be applied to electronic devices.

Though many thin metal materials such as Ag, Cu, Al and the like having a large thermal conductivity are generally known, a thin metal material having a low thermal conductivity is not known much.

Hereinafter, a hybrid heat-insulating sheet according to the present invention applied to the portable terminal machine 1 will be described.

2, the heat-radiating, heat insulating sheet 100 according to the first embodiment includes a heat-diffusing layer 20 for rapidly diffusing heat in a horizontal direction, and a heat- And an insulating layer 10 that blocks and / or delays transmission.

The heat-radiating and heat-insulating sheet 100 according to the first embodiment further includes an adhesive layer 30 laminated on the other surface of the heat-diffusing layer 20 so that the sheet can be adhered to the heat-generating component.

The heat dissipation thermal insulating sheet 100 is obtained by inserting an adhesive or a double-sided tape 30a between the heat insulating layer 10 and the heat spreading layer 20 and attaching the release film 40 to one side of the heat spreading layer 20 Layer 30 is laminated and pressed.

Since the heat insulating layer 10 and the heat spreading layer 20 are both made of a metal material, special bonding such as diffusion bonding may be used depending on the metal material to be bonded.

The release film 40 attached to the outer surface of the adhesive layer 30 is peeled off at the time of use.

The release film 40 used in the heat-insulating and heat-insulating sheet 100 of the present invention protects the heat-diffusing layer 20 and can be a general release film used in the art. But it is preferable to use a film containing at least one resin selected from polyethylene terephthalate resin, polyethylene resin or polypropylene resin.

The pressure-sensitive adhesive or adhesive that can be used for bonding the heat insulating layer 10 and the heat-diffusing layer 20 may be any of those commonly used in the art, and is not particularly limited. For example, an acrylic adhesive or a hot-melt adhesive may be used, and other types of adhesives may be used.

The hot-melt adhesive may be thermoplastic and may be one of urethane, polyamide, polyethylene, E.V.A., polyester, and P.V.C.

The average thickness of the adhesive layer (or pressure-sensitive adhesive layer) is not particularly limited. However, it is preferable that the average thickness of the adhesive layer (or the pressure-sensitive adhesive layer) is set to be at least thin within a range in which adhesion (or adhesion) The adhesive layer (or the adhesive layer) may be formed in a partially bonded form.

In the present invention, the heat diffusion layer 20 is capable of rapidly diffusing heat in the horizontal direction when the thermal conductivity k is large, so that the heat diffusion layer 20 can be easily manufactured and can be easily formed into a thin plate, The heat insulating layer 10 can block and / or delay the transfer of heat in the vertical direction when the value of the thermal conductivity k is small as opposed to the heat diffusion layer 20, Is used.

A material having a small thermal conductivity (k) value is a material having a large heat capacity and can be used as an excellent thermal insulator. That is, the heat capacity is a value that can determine how easily the temperature of an object changes with the amount of heat required to raise the temperature of a certain substance by 1 ° C. If a thin plate metal having a large heat capacity is used as the heat insulating layer 10, The ability to receive and store the transferred heat is large, so that heat transfer to other adjacent components can be prevented.

Since the heat capacity of the metal material having a small thermal conductivity is high, the ability to receive and store the heat transferred from the heat diffusion layer 20 is large. If a metal material having a small thermal conductivity value k is selected as a heat insulating material, it is easy to manufacture and can easily be realized as a thin plate. Thus, a heat dissipation / heat insulating sheet 20 is laminated with a heat diffusion layer 20 formed of a thin metal plate A heat-insulating and heat-insulating sheet of a thin film can be realized.

The heat diffusion layer 20 uses a thin plate metal having a thermal conductivity of at least 100 W / mK, preferably at least 200 W / mK, and the heat insulation layer 10 is made of a heat- A thin metal sheet having a conductivity of 20 W / mK or less, preferably 15 W / mK or less is used.

Here, the larger the thickness of the heat diffusion layer 20, the better the heat diffusion performance. The thicker the heat insulation layer 10, the better the heat insulation performance. Therefore, the optimum performance can be achieved by adjusting the thickness of the heat insulating layer 10 and the heat diffusion layer 20 according to the installation position.

Examples of the metal having a thermal conductivity of not less than 100 W / mK that can be used for the heat diffusion layer 20 include Al, Cu, Ag, Au, Tw, Zn, Mg, Mo and their alloys. As the metal having a conductivity of about 20 W / mK or less, an amorphous thin plate magnetic sheet, a heat resistant metal thin plate sheet, or a stainless steel thin sheet can be used.

In this case, it is preferable to use Cu or Al in view of heat conduction, manufacturing cost, ductility and toughness, and thinning of the heat spreading layer 20.

When an oxidizable material such as Cu is used for the heat diffusion layer 20, an oxidation prevention layer may be formed to prevent oxidation of the heat diffusion layer. The oxidation preventing layer may be formed by coating an antioxidant on the surface of the heat diffusion layer 20 and oxidizing the surface of the heat diffusion layer 20 to form an oxide layer. Here, the antioxidant may be Ni and is specifically prepared by coating Ni to a thickness of about 0.2 mu m.

As described above, the heat radiation < / RTI > heat insulating sheet 100 according to the first embodiment prevents the oxidation of the heat diffusion layer by forming an oxidation preventing film on the surface of the heat diffusion layer 20, can do.

The heat spreading layer 20 quickly diffuses the heat generated from the heat generating component in the horizontal direction to prevent the locally high heat from being sustained, thereby preventing the heat generating component and other adjacent components from being damaged by the high heat.

As the amorphous thin plate magnetic sheet, an amorphous ribbon made of an amorphous alloy or a nano-crystal alloy can be used. The amorphous alloy may be an Fe-based or a Co-based amorphous alloy, and it is preferable to use an Fe-based amorphous alloy in view of material cost.

The Fe-Si-B alloy and the Fe-Si-B-Co alloy may be used as the Fe-based amorphous alloy, and the Co-Si-B- Si-B or Co-Fe-Cr-Si-B alloy.

For example, a Fe-Si-B-Cu-Nb alloy may be used as the nano-crystal alloy used for the thin-film magnetic sheet. In this case, Fe is 73-80 at%, the sum of Si and B is 15 -26 at%, and the sum of Cu and Nb is preferably 1-5 at%. An amorphous alloy having such a composition range in the form of a ribbon can be easily precipitated into nano-phase grains by heat treatment.

The amorphous alloy comprising the amorphous alloy or the nanocrystalline alloy is manufactured by a rapid quenching method (RSP) by melt spinning and then slit and cut to a predetermined width and length so as to facilitate the post-treatment after the heat treatment, Laminated.

When the amorphous ribbon is an amorphous alloy, an extremely thin amorphous ribbon of 30 μm or less made of an Fe-based amorphous ribbon, for example, an Fe-Si-B alloy, is prepared by a rapid coagulation method (RSP) The laminated amorphous ribbon is subjected to a heat treatment at a temperature range of 300 ° C to 600 ° C for 30 minutes to 2 hours.

In this case, the heat treatment atmosphere may be a heat treatment in a nitrogen atmosphere or air.

If the above-mentioned heat treatment temperature is less than 300 ° C, the stress relief of the internal stress generated in the production of the magnetic sheet is not perfect, and unevenness of magnetic properties such as magnetic permeability is not solved, If the temperature exceeds 600 ° C, crystallization in the magnetic sheet rapidly occurs due to the superheat treatment, which results in a remarkably low permeability and does not exhibit a desired permeability. In general, a low heat treatment temperature requires a long treatment time, while a high heat treatment temperature means a short treatment time.

When the amorphous ribbon is made of a nanocrystalline alloy, an extremely thin amorphous ribbon of 30 μm or less made of an Fe-based amorphous ribbon, for example, an Fe-Si-B-Cu-Nb alloy, ). The laminated ribbon sheet is heat-treated at a temperature range of 300 ° C to 700 ° C for 30 minutes to 2 hours so as to obtain a desired magnetic permeability to form a nanocrystalline ribbon sheet having nanocrystalline grains.

In this case, since the content of Fe is 70 at% or more in the heat treatment atmosphere, if the heat treatment is performed in the air, oxidation is performed, which is not preferable from the viewpoint of the visual point. However, even if the heat treatment is performed in the oxidizing atmosphere, the permeability of the sheet is not substantially different at the same temperature condition.

In this case, when the annealing temperature is less than 300 ° C, nanocrystalline grains are not sufficiently generated, and a desired magnetic permeability can not be obtained and the annealing time is long. In the case where the annealing temperature is more than 700 ° C, there is a problem. If the heat treatment temperature is low, the treatment time is long. On the other hand, if the heat treatment temperature is high, the treatment time is preferably shortened.

In the present invention, FeCrAl and Nichrome alloy are used as heat-resistant metal sheet sheets having a small thermal conductivity and can be formed into thin plates, and stainless steels such as SUS 304, SUS 430, SUS 316, and the like.

The amorphous thin plate magnetic sheet has a thickness of 15 to 35 μm, preferably 18 to 27 μm, and the permeability of the sheet increases in proportion to the thickness. The FeCrAl alloy, which is a refractory metal, can be manufactured to a thickness of at least 20 mu m as a thin plate.

The thermal conductivity of the metal material usable as the thermal diffusion layer 20 and the heat insulating layer 10 is shown in Table 1 below.

Kinds Thermal conductivity (W / mK) Kinds Thermal conductivity (W / mK) Ag 429 FeSiB 8 Cu 400 FeSiBCuNb 8 Al 237 CoSiBFe 7 Au 317 FeCrAl 16 Tw 174 Nichrome alloy 12 Zn 116 SUS304 13.2 Mg 156 SUS430 13.1 Mo 138 SUS316 16.3

The adhesive layer 30 is formed of a heat dissipation adhesive layer or a double-sided tape having thermal conductivity of an inorganic material type so that the heat generated from the heat generating component can be quickly transferred to the heat diffusion layer 20. [ The heat-radiating adhesive layer may be a conventional thermally conductive adhesive tape or a thermally conductive adhesive sheet, and may be formed into an inorganic ball nano-web by an electrospinning method.

When the adhesive layer 30 is in the form of an inorganic nano-web, the thermally conductive and electrically conductive adhesive material may include a thermally conductive metal such as Cu, Ag, and Al, a carbon black, a carbon nanotube (CNT) , A conductive polymer (PDOT), a pressure-sensitive adhesive and a solvent to prepare an adhesive material having a viscosity suitable for electrospinning, electrospinning the adhesive material to form a nanofiber, Is accumulated and formed into an inorganic ball nanofiber web.

That is, the adhesive layer 30 can be formed by the electrospinning method, and the thickness of the adhesive layer 30 can be made freely since the thickness is determined according to the amount of radiation of the adhesive substance. The adhesive layer 30 may also be laminated on the heat insulating layer 10 so that a pressure sensitive adhesive layer is provided on both sides of the heat radiation sheet.

In the heat-radiating and heat insulating sheet 100 of the present invention, a heat-radiating coating layer (not shown) may be further included in the heat-dissipating layer 20 and the heat insulating layer 10 to improve the thermal emissivity on both sides or one side exposed to air have. For example, the heat-dissipating layer 20 may have a smaller area than the heat-dissipating layer 20, and the heat-dissipating material may be heat-dissipated from the exposed heat- .

The heat dissipation coating layer is one of a coating layer including a graphene powder, a graphene thin layer, and a film formed by gelation and heat treatment coated with a nanosol dispersed with heat dissipation particles.

Here, the film formed by coating the nano-sol with the heat-dissipating particles dispersed therein and being formed by gelation and heat treatment may be formed, for example, by coating the heat-diffusing layer 20 with the nano-sol dispersed with the heat-dissipating particles and drying to form a gelled film, And the coating layer containing the graphene powder is formed by coating a binder mixed with the graphene powder on the heat diffusion layer 20 by a method such as spray coating, dip coating or roll coating. The graphene thin film refers to a thin film made of pure graphene containing no different materials such as a binder.

In the present invention, by forming concave and convex portions such as micro dimples on the surface of the heat diffusion layer 20 and increasing the contact area with air, the efficiency of heat dissipation from the heat diffusion layer 20 to the outside is improved Can be improved.

As described above, the hybrid heat-insulating sheet 100 according to the present invention is attached to a heat-generating component or another component close to the heat-generating component, so that the heat generated from the heat-generating component is quickly diffused in the horizontal direction by the heat- And the heat insulating layer 10 performs a vertical heat insulating function to suppress or block the heat generated in the heat generating component from being transferred to other components.

In the present invention, since a thin metal plate having a small thermal conductivity value k is used as the heat insulating layer 10, the heat capacity is large and the ability to receive and store the heat transferred from the heat diffusion layer 20 is large. Or the heat transfer to the user is suppressed, so that the external temperature of the electronic apparatus can be maintained at the specified temperature or lower.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the embodiments set forth herein. Various changes and modifications may be made by those skilled in the art.

10: thermal insulation layer 20: heat diffusion layer
30: Adhesive layer 30a: Double-sided tape
40: protective cover layer 100: heat-

Claims (11)

A heat diffusion layer made of a metallic material having a first thermal conductivity so as to diffuse heat in a horizontal direction; And
And a heat insulating layer made of a metal material having a second thermal conductivity lower than the first thermal conductivity so as to prevent heat from being transferred in a vertical direction, the heat insulating layer being laminated on one surface of the heat diffusion layer. The method according to claim 1,
Wherein the heat diffusion layer is made of a metal plate having a thermal conductivity of 100 W / mK or more and includes one or more alloys selected from Al, Cu, Ag, Au, Tw, Zn, Mg and Mo, Thermal insulation sheet. The method according to claim 1,
Wherein the heat insulating layer is made of a metal plate having a thermal conductivity of 20 W / mK or less. The method of claim 3,
Wherein the heat insulating layer is made of any one of amorphous alloy, FeCrAl, nichrome alloy, and stainless steel. 5. The method of claim 4,
Wherein the stainless steel is one of SUS 304, SUS 430, and SUS 316. The heat-insulating and heat-insulating hybrid sheet according to claim 1, wherein the heat insulating layer is an amorphous thin plate magnetic sheet made of a heat-treated amorphous ribbon. The method according to claim 1,
Wherein the heat insulating layer and the heat diffusion layer are bonded to each other using an adhesive or a double-sided tape or by diffusion bonding. The method according to claim 1,
And a pressure-sensitive adhesive layer laminated on the other surface of the heat-diffusing layer. The method according to claim 1,
Wherein the heat-dissipating and heat-insulating sheet further comprises a heat-radiating coating layer on both sides or one side of the heat-diffusing layer and the heat-insulating layer exposed to the air to improve the thermal emissivity. A first metal plate having a high thermal conductivity; And
A second metal plate laminated on the first metal plate and having a low thermal conductivity,
Wherein the first metal plate is made of a metal material having a thermal conductivity of 100 W / mK or more, and the second metal plate is made of a metal material having a thermal conductivity of 20 W / mK or less. The portable terminal device according to any one of claims 1 to 10, comprising a hybrid heat-and-insulating sheet.

Images