KR20150141402A - Heat radiation and insulation sheet and portable terminal equipment having the same - Google Patents

Abstract

According to the present invention, a hybrid heat insulation sheet comprises: a thermal diffusion layer which is made of a metal material of low non-resistance to diffuse heat in a horizontal direction; a heat insulation layer which is made of a metal material of high non-resistance and laminated on one surface of the thermal diffusion layer to prevent heat from being vertically transferred; and an adhesive layer which is laminated on the other surface of the thermal diffusion layer. Heat generated in a heating component of an electronic device is diffused to prevent deterioration of the heating component and prevent heat generated in the heating component from being transferred to the 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 hybrid heat-and-insulating sheet capable of rapidly dissipating heat generated from a heat-generating component of an electronic device and preventing transmission of generated heat to other components, and a portable terminal device having 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.

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.

The conventional heat radiation sheet includes a thermally conductive metal sheet 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, as disclosed in Patent Document 10-0721462 , The adhesive 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-

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.

In addition, the conventional heat-radiating sheet has a function of attaching to a component of an electronic apparatus and performing only a function of dissipating heat generated from the component, and the heat generated in the component can not be blocked from being transmitted to other components.

Furthermore, the portable electronic device is provided with a plurality of antennas for radio communication necessary for NFC, RFID, digitizer, etc., and for transmitting and receiving radio waves necessary for wireless charging, in addition to wireless communication required for mobile communication. A plurality of thin film shielding sheets having a magnetic field or an electromagnetic wave shielding function are required.

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 thermal diffusion and heat trapping or heat insulating function. In view of the fact that when the specific resistance is large, thermal conductivity is very low, The present invention has been achieved.

In addition, it has been found that the amorphous thin film sheet can be easily realized as an ultra-thin film as well as having a high specific resistance, and can be used as a shielding sheet, and has the advantage of simultaneously realizing the adiabatic, magnetic field or electromagnetic wave shielding function.

Patent Document 1: Registration No. 10-0721462

The present invention has been conceived to solve the problems as described above. The object of the present invention is to provide a metal plate having a small specific resistance and a second metal plate having a high resistivity by combining a first metal plate having a high thermal conductivity, And a second metal plate having a small width is used as a heat insulating sheet to realize both a heat insulating function and a heat insulating function while being an ultra thin film, and a portable terminal device having the same.

An object of the present invention is to provide a hybrid heat-and-insulating sheet capable of simultaneously realizing an adiabatic, magnetic field or electromagnetic wave shielding function by using an amorphous thin sheet which can be easily realized as an ultra-thin film as well as a high specific resistance, And a portable terminal device.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. .

In order to achieve the above object, the hybrid heat-dissipating single sheet of the present invention comprises a heat-diffusing layer made of a metal material having a small specific resistance so as to diffuse heat horizontally; A heat insulating layer made of a metal material having a high specific resistance so as to prevent heat from being transferred in a vertical direction; And an adhesive layer laminated on the other surface of the heat diffusion layer.

The heat diffusion layer may be formed of a metal plate made of Cu, Ag, Al, or an alloy containing at least two of Cu, Ag, and Al. And an oxidation preventing layer stacked on the surface of the heat diffusion layer 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, or oxidizing the surface of the heat diffusion layer to form an oxidation coating.

The heat insulating layer may use a metal material having a resistivity of 100 or more. The heat insulating layer may be formed of any one of an amorphous thin plate magnetic sheet and FeCrAl, TiAlV, and NiMoFe alloys.

The amorphous thin plate magnetic sheet may use an amorphous alloy or a nanocrystalline alloy.

In addition, the heat insulating layer may include an amorphous thin-film magnetic sheet having a heat-treated amorphous ribbon flaked and separated and / or cracked into a plurality of minute pieces; A protective film adhered to one side of the amorphous thin plate magnetic sheet; And a double-sided tape adhered to the other side of the amorphous thin plate magnetic sheet.

The adhesive layer may be formed of any one of a thermally conductive metal, a carbon black, a carbon nanotube, a Graphene, a thermally conductive polymer (PDOT), a conductive adhesive material obtained by mixing a pressure-sensitive adhesive and a solvent .

According to another aspect of the present invention, a hybrid type heat-insulating sheet includes a first metal plate having a small specific resistance; And a second metal plate laminated on the first metal plate and having a large specific resistance, wherein the first metal plate is made of a metal material having a specific resistance of less than 5, and the second metal plate is made of a metal material having a specific resistance of 100 or more.

As described above, in the present invention, the first metal plate having a small resistivity and the second metal plate having a large resistivity are combined to form a thermal diffusion sheet, and the second metal plate having a small thermal conductivity is used as a thermal insulation sheet It is possible to realize both the heat radiation and the heat insulation function while being an ultra thin film.

In addition, the present invention can easily realize an ultra-thin film as well as a high resistivity, and can realize an adiabatic, magnetic field or electromagnetic wave shielding function simultaneously by using an amorphous thin film sheet which can be used as a shielding sheet.

Therefore, by applying the hybrid heat-insulating sheet of the present invention, the heat generated from the heat-generating component of the electronic device is rapidly diffused to prevent the deterioration of the heat-generating component, and the heat generated from the heat- .

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 first embodiment of the present invention.
3 is a cross-sectional view of a hybrid heat-insulating and heat-insulating sheet according to a second embodiment of the present invention.
4 is a graph showing the correlation between the thermal conductivity and the resistivity of the metal material applied to the hybrid heat-insulating sheet 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.

FIG. 2 is a cross-sectional view of a hybrid thermal insulation sheet according to a first embodiment of the present invention, and FIG. 3 is a cross-sectional view of the hybrid thermal insulation sheet according to the first embodiment of the present invention. Sectional view of a hybrid thermal insulation sheet according to a second embodiment of the present invention.

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 is generated in an exothermic component such as an application processor, a PMIC (Power Management Integrated Circuit), a communication processor, and a battery provided in the portable terminal device 1 So that the heat generating component is prevented from being damaged by heat and the heat generated in the heat generating component is prevented from being transferred to the other component.

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 a pressure-sensitive adhesive layer (30) laminated on the other surface of the heat diffusion layer (20).

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

The heat-diffusing layer 20 is formed of a metal having excellent thermal conductivity. For example, Cu, Ag, Al and alloys thereof may be used. Preferably, Cu having excellent thermal conductivity may be used.

On the other hand, according to the Wiedemann-Franz Law, on the basis of the fact that the product of the electrical resistivity and the thermal conductivity is constant irrespective of the kind of the metal, the present invention considers that the thermal conductivity is large when the specific resistance is small A metal material having a small specific resistance was selected as a heat diffusion material.

In the present invention, as described later, in the hybrid type heat-insulating sheet, the heat-diffusing layer 20 can be made of a metal material having a resistivity different from that of the heat-insulating layer 10. In this case, the heat diffusion layer 20 preferably has a specific resistance of less than 5.

When an oxidizable material such as Cu is used for the heat diffusion layer, 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.

The heat spreading layer 20 can be made of any material capable of rapidly diffusing heat in a horizontal direction such as a graphite sheet in addition to a thermally conductive metal.

The heat insulating layer 10 is made of a metal material having a low resistivity and a high resistivity so as to block the heat transmitted in the vertical direction.

Here, the heat insulating performance is improved as the thickness of the heat insulating layer 10 is thicker, and the heat spreading performance can be improved as the thickness of the heat spreading layer 20 is thicker. 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.

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.

Thermal conductivity refers to the energy delivered per unit time by the heat transfer coefficient (P), simply referred to as the conductivity, when the energy transferred through the plate from the hot side to the cold side during the time (t) Fourier) < / RTI >

[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, metal has high conductivity of heat, and heat conduction is good.

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.

In general, metals are known to be unsuitable as an insulating material because they are excellent thermal conductors having a high thermal conductivity (k) value. In the present invention, according to the Wiedemann-Franz law, electrical resistivity Based on the fact that the product of the thermal conductivity is constant, considering the fact that the thermal conductivity is small when the specific resistivity is large, a metal material with a high resistivity is selected as the thermal insulator.

Accordingly, in the present invention, a heat-resistant metal material made of an amorphous thin plate magnetic sheet and a FeCrAl, TiAlV, or NiMoFe alloy is used as a material applicable to the insulating layer 10.

The relationship between the thermal conductivity and the resistivity of the metal material adopted as the material of the thermal diffusion layer 20 and the heat insulating layer 10 in the present invention is shown in Table 1 and shown in the graph in FIG.

Kinds Thermal conductivity (W / mK) Resistivity (μΩ · cm) Ag 429 1.6 Cu 400 1.7 Al 237 2.6 Ni 90 6.9 Fe 80 10.0 SUS304 13.2 67.0 SUS430 13.1 60.0 FeCrAl 16 134.0 FeSiB 8 130.0 FeSiBCuNb 8 130.0 CoSiBFe 7 142.0

As shown in Table 1, according to the Wiedemann-Franz Law, a metal having a small specific resistance has a large thermal conductivity, and a metal having a large specific resistance has a small thermal conductivity.

For example, Cu with a specific resistivity of 1.7 has a thermal conductivity of 400 and a FeSiB with a specific resistivity of 130.0 has a thermal conductivity of 8, which is small.

In the present invention, in the case of a heat insulating material having a heat insulating function and a shielding function simultaneously, in the case of an amorphous material having a high specific resistance, not only the thermal conductivity k is relatively small but also the thinning can be easily performed, And developed it as an insulation material.

In the present invention, in the case of a heat insulating material not requiring a shielding function and requiring only a heat insulating function, FeCrAl, TiAlV, or NiMoFe alloy, which has a high specific resistance and can be formed into a thin plate, is used as a heat resistant metal material.

The FeCrAl alloy has a resistivity of 134.0, the TiAlV alloy has a resistivity of 171, and the NiMoFe alloy has a very large value of 130, and the thermal conductivity is known to be similar to the amorphous material described above.

In the present invention, a metal material having a high resistivity is used as a heat insulator. As the metal material having a high specific resistance, an amorphous thin plate magnetic sheet as a soft magnetic material and a thin sheet made of FeCrAl, TiAlV, or NiMoFe alloy having excellent heat resistance can be used.

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.

Further, it is preferable to use an alloy satisfying the following formula (3).

&Quot; (3) "

_{Fe 100 -cdefg- h A c D d} E e Si f B g Z h

Wherein A is at least one element selected from Cu and Au and D is at least one element selected from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Ni, Co and rare earth elements At least one element selected from Mn, Al, Ga, Ge, In, Sn and a platinum group element; Z represents at least one element selected from C, N and P; , c, d, e, f, g, and h satisfy the relationships 0.01? c? 8at%, 0.01? d? 10at%, 0? e? 10at%, 10? f? 25at% ? F + g + h? 35at%, and the area ratio of the alloy structure is 20% or more and has a fine structure with a particle diameter of 50 nm or less.

In the above formula (3), the element A is used for improving the corrosion resistance of the alloy, preventing coarsening of crystal grains, and improving magnetic properties such as iron loss and magnetic permeability of the alloy. If the content of the element A is too small, it is difficult to obtain a coarsening inhibiting effect of the crystal grains. On the other hand, if the content of element A is too large, the magnetic properties are deteriorated. Therefore, the content of the element A is preferably in the range of 0.01 to 8 at%. The D element is an element effective for homogenizing crystal grain diameters and reducing magnetostriction. The content of the D element is preferably in the range of 0.01 to 10 at%.

The element E is an effective element for improving the soft magnetic characteristics and corrosion resistance of the alloy. The content of the element E is preferably 10 at% or less. Si and B are the elements for promoting the amorphization of the alloy in the production of the magnetic sheet. The Si content is preferably in the range of 10 to 25 at%, and the B content is preferably in the range of 3 to 12 at%. In addition, the alloy may contain a Z element as an amorphization forming element of an alloy other than Si and B. In this case, the total content of Si, B and Z elements is preferably in the range of 15 to 35 atomic%. The microcrystalline structure is preferably formed so as to realize a structure in which crystal grains having a grain size of 5 to 30 nm exist in an area ratio of 50 to 90% in the alloy structure.

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 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.

FeCrAl, TiAlV, and NiMoFe alloys, which are heat-resistant metal materials, can be used which are made of thin plates to a thickness of at least 20 μm.

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 addition, the amorphous ribbon becomes brittle when heat treatment is performed, so flakes can be easily formed in flakes in a subsequent process.

The adhesive layer 30 is formed of an adhesive material 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 rapidly transferred to the heat diffusion layer 20. [ For example, the adhesive layer may be a conventional thermally conductive adhesive tape or a thermally conductive adhesive sheet, and may be formed in the form of an inorganic ball nanowire 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 in the electrospinning method, and the thickness of the adhesive layer 30 can be freely determined because the thickness is determined according to the amount of the adhesive material. 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.

As described above, in the hybrid heat-insulating sheet 100 according to the first embodiment, the heat generated from the heat-generating component is adhered to the heat-generating component or other components close to the heat-generating component, and the heat is quickly diffused So that the heat insulating layer 10 performs a vertical heat insulating function to block the heat generated in the exothermic parts from being transferred to other parts.

3, the hybrid thermal insulation sheet according to the second embodiment of the present invention includes a heat diffusion layer 20 for diffusing heat in a horizontal direction, And a pressure-sensitive adhesive layer (30) laminated on the other surface of the heat-diffusing layer (20).

In the second embodiment, the heat diffusion layer 20 and the adhesive layer 30 have the same structure as that of the first embodiment.

In the second embodiment, the heat insulating layer 10a is applied to a case where an amorphous thin plate magnetic sheet which can be easily flaked as a fine piece when heat treatment is used as an insulating material.

The heat insulating layer 10a includes an amorphous thin plate magnetic sheet 12 having an amorphous ribbon or strip (hereinafter, simply referred to as a ribbon) heat treated and flaked and separated and / or cracked into a plurality of minute pieces, A protective film 11 adhered to one side of the amorphous thin plate magnetic sheet 12, and a double-sided tape 13 adhered to the other side of the amorphous thin plate magnetic sheet 12.

As the amorphous thin plate magnetic sheet 12, an amorphous ribbon made of an amorphous alloy or a nano-crystal alloy can be used as in the first embodiment.

The protective film 11 may be formed of, for example, a polyethylene terephthalate (PET) film, a polyimide film, a polyester film, a polyphenyl linseed fade (PPS) film, a polypropylene (PP) film, A base material 11a such as a fluororesin film may be used and a first adhesive layer 11b may be formed on one side of the first adhesive layer 11b. When the first adhesive layer 11b is attached to one side of the amorphous thin plate magnetic sheet 12, 11b are removed and attached to the other side of the first adhesive layer 11b to protect the first adhesive layer 11b.

The double-sided tape 13 may be made of an inorganic material or a substrate type. In the case of a substrate type, a double-sided tape 13 may be formed by using a fluororesin film such as PET (polyethylene terephthalate) On the outer side of the adhesive layer, a release film is attached to protect the adhesive layer.

The double-sided tape 13 is used in a state where the upper release film is removed when adhered to the lower portion of the amorphous thin plate magnetic sheet 12 and the lower release film is used as the heat release layer 10a, And is peeled off.

The double-sided tape 13 may be of a type having a base material as described above and an inorganic material type formed only of a pressure-sensitive adhesive layer without a base material, and it is preferable to use an inorganic material type in view of thinness.

The adhesive layer used for the protective film 11 and the double-sided tape 12 can be, for example, an acrylic adhesive, and it is of course possible to use other kinds of adhesives.

The heat insulating layer 10a is formed by using a heat treated amorphous ribbon as the amorphous thin plate magnetic sheet 12 and laminating the protective film 11 on one side of the amorphous thin plate magnetic sheet 12 and forming the amorphous thin plate magnetic sheet 12, The double-sided tape 13 is laminated on the other side. Thereafter, the laminated sheet is passed through a flake processing apparatus to separate and / or crack into a plurality of minute pieces in the amorphous thin plate magnetic sheet 12, and then passed through a lamination apparatus to form a plurality of flow- As well as slimming and stabilizing the micro-pieces.

The heat insulating layer 10a is separated into fine pieces by the flaking treatment of the amorphous thin plate magnetic sheet 12, thereby reducing the eddy current. In addition, the gap formed between the fine pieces may be partially filled with the adhesive layer from the protective film and the double-sided tape during the planarization process.

The heat insulating layer 11a is attached to the back surface of the digitizer panel to shield the electromagnetic field generated from various parts of the portable terminal device body. The magnetic shielding sheet for a digitizer, the body of the portable terminal device, A magnetic shield sheet for a wireless charger, an electromagnetic wave absorbing sheet, or the like.

Therefore, the hybrid heat-insulating sheet according to the second embodiment of the present invention is equipped with a heat-dissipating and heat-insulating function in the same manner as the first embodiment, and shields the magnetic field to block mutual influences between the circuits .

The protective cover layer 40 is formed on the exposed surface of the adhesive layer 30, and is peeled off when the protective cover layer 40 is used.

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, 10a: insulating layer 11: protective film
12: amorphous thin plate magnetic sheet 13: double-sided tape
20: heat diffusion layer 30: adhesive layer
40: protective cover layer 100: heat-

Claims (12)

A heat diffusion layer made of a metal material having a small specific resistance so as to diffuse heat in a horizontal direction;
A heat insulating layer made of a metal material having a high specific resistance so as to prevent heat from being transferred in a vertical direction; And
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 dissipation layer is formed of a metal plate made of a graphite sheet, Cu, Ag, Al, or an alloy thereof. The method according to claim 1,
Wherein the heat insulating layer is made of a metallic material having a resistivity of 100 or more. The method of claim 3,
Wherein the heat insulating layer is made of any one of amorphous thin plate magnetic sheet, FeCrAl, TiAlV, and NiMoFe alloy. 5. The method of claim 4,
Wherein the amorphous thin plate magnetic sheet is made of an amorphous alloy or a nanocrystalline alloy. The heat sink according to claim 1, wherein the heat insulating layer
An amorphous thin plate magnetic sheet on which a heat-treated amorphous ribbon is flaked to separate and / or crack into a plurality of minute pieces;
A protective film adhered to one side of the amorphous thin plate magnetic sheet; And
And a double-sided tape adhered to the other side of the amorphous thin plate magnetic sheet. The method according to claim 1,
Further comprising an oxidation preventing layer laminated on the surface of the heat diffusion layer to prevent oxidation of the heat diffusion layer. 8. The method of claim 7,
Wherein the oxidation preventing film is formed by coating an antioxidant material on the surface of the heat diffusion layer or oxidizing the surface of the heat diffusion layer to form an oxide film. 8. The method of claim 7,
Wherein the heat diffusion layer is made of Cu and the oxidation preventing film is made of Ni. The method according to claim 1,
The adhesive layer is formed of a conductive adhesive material obtained by mixing any one of a thermally conductive metal, a carbon black, a carbon nanotube, a Graphene, a thermally conductive polymer (PDOT), a pressure sensitive adhesive and a solvent Of the heat-insulating sheet. A first metal plate having a small specific resistance; And
And a second metal plate stacked on the first metal plate and having a high specific resistance,
Wherein the first metal plate is made of a metal material having a specific resistance of less than 5 and the second metal plate is made of a metal material having a specific resistance of 100 or more. A portable terminal device comprising the hybrid heat-and-insulating sheet according to any one of claims 1 to 11.

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