KR20150080438A - Complex sheet and portable terminal having the same - Google Patents

Abstract

The present invention relates to a complex sheet and a portable terminal having the same. The complex sheet includes a first insulation member including multiple fine pores forming an air pocket for insulation; a heat spreader diffusing and radiating heat; and a second insulation member easily transferring conducted heat in horizontal direction, but controlling transfer in vertical direction.

Description

[0001] Description [0002] COMPOSITE SHEET AND PORTABLE TERMINAL HAVING THE SAME [Technical Field]

The present invention relates to a composite sheet, and more particularly, to a composite sheet capable of maximizing heat transfer suppressing function and heat dissipation function by dissipating heat to dissipate heat, .

Generally, when an electronic product such as a computer, a display, or a portable terminal can not adequately diffuse the heat generated from the inside to the outside, it causes generation of a screen afterimage due to excessive accumulated heat, a collision with a system failure, May shorten the life of the device or, in severe cases, may cause explosion or fire.

2. Description of the Related Art In recent years, electronic products including portable terminals have been continuously developed, and electronic products have been promoted in terms of high performance and versatility according to the needs of users.

Particularly, in order to maximize the portability and convenience of the user, the portable terminal is required to be downsized and lightweight, and components integrated in smaller and smaller spaces for high performance are mounted. Accordingly, components used in the portable terminal have high performance and high heat generation temperature, and the increased heat generation temperature affects the adjacent components, thereby causing a problem of deteriorating the performance of the portable terminal.

Various heat insulating materials have been applied to portable terminals in order to solve the problem by such heat generation. However, until now, various researches and technologies for insulation have been developed since an optimal heat insulating material having a thin thickness and excellent heat insulating performance is not developed yet.

Korean Patent Registration No. 10-1134880 discloses a portable terminal having a heat insulating film including a heat insulating film disposed on the front surface of an LCD, so that heat generated from the portable terminal is transmitted to the user's face through an LCD There is an advantage that it can be prevented. However, such a heat insulating film is a low emissivity film which blocks the passage of heat while permitting the maximum transmittance of the visible light ray. It is attached to the front of the LCD panel and used for the high temperature There is a limit in inserting the heat, and there is a problem that the heat problem generated in the recent high performance portable terminal can not be solved.

Therefore, the inventors of the present invention have been continuously studying a technique capable of achieving slimness and excellent heat transfer suppression performance, thereby maximizing the heat transfer suppression efficiency with a single sheet, And has completed the present invention which is more economical, utilizable and competitive.

Korean Patent Registration No. 10-1134880

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a composite sheet capable of performing both heat insulation suppression and heat dispersion as a single heat insulating sheet, There is.

Another object of the present invention is to provide a composite sheet capable of maximizing the heat transfer suppression efficiency by double heat shielding in the first and second heat insulating members, and a portable terminal having the composite sheet.

In order to achieve the above-mentioned object, an embodiment of the present invention is characterized by comprising: a first heat insulating member having a plurality of micropores forming an air pocket for thermal insulation; A heat spreader for diffusing heat to dissipate heat; And a second heat insulating member which facilitates transfer of the conducted heat in the horizontal direction but inhibits transmission in the vertical direction.

According to another aspect of the present invention, A rear cover detachable from the rear surface of the terminal body; A display unit exposed on the terminal body; And a composite sheet adhered to the inside of the rear cover or the rear surface of the display unit, wherein the composite sheet comprises: a first heat insulating member having a plurality of micropores forming air pockets for heat insulation; A heat spreader for diffusing heat to dissipate heat; And a second heat insulating member which facilitates transmission of the conducted heat in the horizontal direction but inhibits transmission in the vertical direction.

As described above, in the present invention, the heat transfer suppression and the heat dissipation can be performed together with one sheet, so that it is unnecessary to provide the respective sheets for heat transfer suppression and heat dissipation, so that the manufacturing cost can be remarkably reduced.

In the present invention, there is an effect that an ultra-thin first heat insulating member, a heat spreader and a second heat insulating member are laminated to obtain an ultra thin sheet for heat transfer suppression and heat radiation having a thickness of several tens of um.

In the present invention, there is an advantage that heat transfer can be suppressed in the first and second heat insulating members to maximize the heat transfer suppressing efficiency.

In the present invention, a nanofiber web in which electrospun nanofibers are arranged in a three-dimensional network structure is applied to a composite sheet to improve heat transfer suppression performance by using three-dimensional nano-sized micropores of a nanofiber web having a high heat- Can be provided.

In the present invention, an ultra-thin sheet can be made excellent in heat transfer suppression and heat dissipation performance, and can be applied to a high-performance electronic product including a portable terminal.

Figs. 1A to 1C are schematic cross-sectional views of a composite sheet according to first to third embodiments of the present invention,
FIGS. 2A and 2B are conceptual sectional views illustrating a porous thin film adopted as a first heat insulating member of a composite sheet according to first to third embodiments of the present invention,
3A and 3B are conceptual cross-sectional views illustrating a state in which an adhesive layer is applied to the composite sheet according to the first to third embodiments of the present invention,
4A to 4C are conceptual sectional views showing a state in which a double-sided tape is applied to the composite sheet according to the first to third embodiments of the present invention,
5 is a cross-sectional view of a composite sheet according to a fourth embodiment of the present invention,
6 is a cross-sectional view of a composite sheet according to a fifth embodiment of the present invention,
7A and 7B are conceptual sectional views illustrating a portable terminal equipped with a composite sheet according to the present invention.

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

1A to 1C are schematic cross-sectional views of a composite sheet according to the first to third embodiments of the present invention.

The composite sheet of the present invention comprises a first heat insulating member having a plurality of micropores forming an air pocket for heat insulation; A heat spreader for dispersing heat; And a second heat insulating member for transferring the conducted heat in the horizontal direction but suppressing the transfer in the vertical direction are stacked to realize a heat transfer suppressing function and a heat radiating function in one sheet.

That is, in the present invention, the first heat insulating member 100; A heat spreader 110; And the second heat insulating member 120 are formed into a single sheet, it is possible to perform a function of suppressing heat transfer and a function of dissipating heat by dispersing heat.

In the present invention, the first heat insulating member 100, the heat spreader 110, and the second heat insulating member 120 are freely disposed in the order of the position where the sheet is mounted, the purpose of using the sheet, Can be used as a composite sheet.

That is, referring to FIG. 1A, a composite sheet according to a first embodiment of the present invention includes: a first heat insulating member 100; A heat spreader 110 laminated on the first heat insulating member 100; And a second heat insulating member 120 laminated on the heat spreader 110. That is, in the first embodiment, the first heat insulating member 100, the heat spreader 110, and the second heat insulating member 120 are laminated in this order.

1B is a view illustrating a composite sheet according to a second embodiment of the present invention by stacking the heat spreader 110, the first heat insulating member 100, and the second heat insulating member 120 in this order.

The composite sheet according to the third embodiment of the present invention is formed by stacking the heat spreader 110, the second heat insulating member 120, and the first heat insulating member 100 in this order as shown in FIG. 1C.

The first heat insulating member 100 is preferably applied as a porous thin film having a plurality of pores capable of blocking heat such as a nanofiber web.

The lamination in the present invention means that the first heat insulating member 100, the heat spreader 110 and the second heat insulating member 120 are piled up by a bonding relationship such as adhesion, adhesion, contact, fixing and the like.

In the composite sheet according to the first to third embodiments of the present invention, the transmitted heat is blocked by the first heat insulating member 100 to perform a heat insulating function, and heat is dispersed in the heat spreader 110, And the second heat insulating member 120 performs a heat transfer suppressing function to perform both heat transfer suppression and heat dissipation in a single sheet.

In addition, the composite sheet of the present invention can be realized as an ultra-thin sheet having a thickness of several tens of um by realizing the ultra-thin first heat insulating member 100, the heat spreader 110 and the second heat insulating member 120 by lamination.

The second heat insulating member 120 may include a magnetic sheet having a vertical thermal conductivity ratio of 10: 1 or more in a direction perpendicular to the thermal conductivity, and may include a magnetic sheet having a specific resistance of at least 100 or more. At this time, the magnetic sheet may be composed of an Fe-based amorphous alloy or a Co-based amorphous alloy, and the Fe-based amorphous alloy may be an Fe-Si-B alloy or an Fe-Si-B-Cu-Nb alloy.

Further, the magnetic sheet may be separated into a plurality of pieces or in a bulk state (not separated into three pieces). Here, the magnetic sheet in a state of being divided into a plurality of pieces is composed of a plurality of fine pieces separated in a minute size and adjacently arranged, and an adhesive member is attached to one or both of the upper and lower portions of the magnetic sheet, May have structural features that are wholly or partly insulated. The gap may be a part of the adhesive provided on the adhesive member,

At this time, it is preferable that many pieces of the magnetic sheet have an irregular size of several tens of μm to 3 mm or less, and the pieces of the magnetic sheet may have the same shape or different shapes, and may be a random shape.

The thickness of the magnetic sheet may be 5 to 50 mu m.

The first heat insulating member 100 is formed of a porous thin film capable of blocking transmitted heat by pores. The first heat insulating member 100 may be, for example, a nano-fiber web having a plurality of pores by electrospinning, a nonwoven fabric having a plurality of pores, polyether sulfone (PES), etc., Any material can be applied as long as it can be vertically insulated. Here, it is preferable that the pore size of the first heat insulating member 100 is less than a maximum of 5 占 퐉 at several tens nm.

When the first heat insulating member 100 is in the form of a nanofiber web, a spinning solution is prepared by mixing a polymer material having excellent heat resistance and a solvent at a predetermined ratio, and the spinning solution is electrospun to form nanofibers And the nanofibers are accumulated to form a nano web having a plurality of pores.

As the diameter of the nanofiber decreases, the specific surface area of the nanofiber increases and the heat shielding ability of the nanofiber web having a plurality of micropores increases, thereby improving the heat insulating performance. Therefore, the diameter of the nanofiber is in the range of 0.3-1.5 μm, and the thickness of the first heat insulating member 100 is 10-25 μm. The porosity of the pores formed in the first heat insulating member 100 is preferably in the range of 50 to 80%.

Here, the spinning method applied to the present invention is a spinning method using general electrospinning, air-electrospinning (AES), electrospray, electrobrown spinning, centrifugal electrospinning, , And flash-electrospinning may be used.

The polymeric material used to make the first heat insulating member 100 may be selected from, for example, low polymer polyurethane, high polymer polyurethane, PS (polystylene), PVA (polyvinylalcohol), PMMA (polymethyl methacrylate), polylactic acid (PVA), polyvinylpyrrolidone (PVP), polyvinylchloride (PVA), polyvinylpyrrolidone (PVA), polyacrylonitrile (PCA) , Nylon, polycarbonate, polyetherimide, polyvinylidene fluoride (PVdF), polyetherimide (PEI), and polyestheresulphone (PES).

Among the above polymers, the polyurethane (PU) has a thermal conductivity of 0.016 to 0.040 W / mK and the polystyrene has a thermal conductivity of 0.033 to 0.040 W / mK, and the nanoweb obtained by spinning it also has a low thermal conductivity.

The solvent is selected from the group consisting of DMA (dimethyl acetamide), N, N-dimethylformamide, N-methyl-2-pyrrolidinone, DMSO, THF, DMAc, ethylene carbonate, DEC, dimethyl carbonate, ethyl methyl carbonate, propylene carbonate, water, acetic acid, and acetone. .

Since the first heat insulating member 100 is manufactured by the electrospinning method, the thickness is determined according to the spinning amount of the spinning solution. Therefore, there is an advantage that it is easy to make the thickness of the first heat insulating member 100 to a desired thickness.

Since the first heat insulating member 100 is formed as a nanofiber web in which the nanofibers are accumulated by the spinning method, the first heat insulating member 100 can be formed into a shape having a plurality of pores without any additional process. It is also possible to adjust the size. Therefore, it is possible to finely form a large number of pores, so that the heat shielding performance is excellent and the heat insulating performance can be improved accordingly.

The heat spreader 110 disperses heat transmitted from the outside. That is, the heat spreader 110 can function to dissipate heat by preventing the heat generated from the heat generating component from concentrating in one place.

Further, the heat spreader 110 may be a metal thin plate having a thermal conductivity of 200 W / m · K or more, and the metal thin plate is preferably Cu or Al.

FIGS. 2A and 2B are conceptual sectional views illustrating a porous thin film adopted as a first heat insulating member of a composite sheet according to first to third embodiments of the present invention. FIG.

The first heat insulating member of the composite sheet according to the first through third embodiments of the present invention can be applied as a porous thin film having a plurality of micropores. At this time, the first heat insulating member is integrated by the nanofibers into the porous thin film The nanofiber webs 102 and 103 having a micropore structure, the nonwoven fabric 101, and the laminated structure thereof.

The laminated structure of the nanofiber webs 102 and 103 and the nonwoven fabric 101 may be a laminated structure of the nanofibrous web 102 and the nonwoven fabric 101 as shown in FIGS. 2A and 2B, 102) / non-woven fabric 101 / nanofiber web 103 (Fig. 2B). At this time, it is preferable that the thickness t1 of the nanofiber web 102 is thinner than the thickness t2 of the nonwoven fabric 101.

If the first heat insulating member is applied to the laminated structure of the nanofiber web 102 and the nonwoven fabric 101, the nonwoven fabric 101 is less expensive and has a higher strength than the nanofiber web 102, The manufacturing cost of the sheet can be reduced and the strength can be improved. In addition, since the nonwoven fabric 101 also has a plurality of pores, the nonwoven fabric 101 has a function of blocking heat and plays a role of a heat insulating part.

Here, the nanofiber web 102 and the nonwoven fabric 101 may be fused due to thermocompression bonding, and the melting point of the nanofiber web 102 may be designed to be lower than the melting point of the nonwoven fabric 101, It is preferable that the nanofiber web 102 is melted and fused to the nonwoven fabric 101. For example, when the polymer material for forming the nanofiber web 102 is applied as PVdF, since the melting point of PVdF is 155 ° C, the nonwoven fabric 101 is a polyester-based material having a melting point higher than 155 ° C, A nonwoven fabric 101 made of one of nylon series and cellulosic series is applied.

Therefore, at the time of thermocompression bonding, the region of the nanofiber web 102 contacting the nonwoven fabric 101 melts and is fused to the nonwoven fabric 101. Here, since the pore size of the nonwoven fabric 101 is much larger than the pore size of the nanofiber web, a part of the molten nanofiber web 102 penetrates into the pores of the nonwoven fabric 101. That is, the nanofibrous web 102 (which is melted in the direction of the nanofiber web 102 and in the direction of the nonwoven fabric 101) after thermocompression based on the interface between the nonwoven fabric 101 and the nanofiber web 102 before thermocompression ) Is spread and distributed. When the degree of melting of the nanofiber web 102 is adjusted, the nanofiber web 102 is melted into the pores of the nonwoven fabric 101, and the nano- The fibrous web 102 performs a locking function to improve the adhesion between the nano-fiber web 102 and the nonwoven fabric 101.

In the present invention, as a polymer material forming a nanofiber web, a polymer material in which PVdF and PAN are mixed in a ratio of 5: 5 can be applied. At this time, the electrospun nanofibers are formed of a structure comprising a core made of PAN and an outer skin made of PVdF surrounding the core, and the nanofibers having such a structure are laminated to form a nanofiber web 102. When the nanofibrous web 102 and the nonwoven fabric 101 having the core and the outer skin structure laminated are thermally compressed, the PVdF of the outer skin melts and fuses to the nonwoven fabric 101.

3A and 3B are conceptual cross-sectional views illustrating a state in which an adhesive layer is applied to the composite sheet according to the first to third embodiments of the present invention.

In the composite sheet according to the first to third embodiments of the present invention, an adhesive layer 130 capable of rapidly transferring the heat generated from the heat generating component to the first heat insulating member 100 or the heat spreader 110 is applied, The adhesive layer 130 is formed of an adhesive material having excellent thermal conductivity.

As an example, the adhesive layer 130 may be formed of a conventional thermally conductive adhesive tape or a thermally conductive adhesive sheet, and may be formed into an inorganic pore nanofiber web by an electrospinning method.

When the adhesive layer 130 is in the form of an inorganic nanofiber web, the thermally conductive and electrically conductive adhesive material may include thermally conductive metals such as Ni, Cu, and Ag, which have excellent thermal conductivity, carbon black, carbon nanotubes, A pressure sensitive adhesive material having a viscosity suitable for electrospinning is prepared by mixing a pressure sensitive adhesive and a solvent with either one of Graphene and Conductive Polymer (PDOT), and the adhesive material is electrospun to form a nanofiber, And is formed into an inorganic ball type film.

That is, the adhesive layer 130 can be formed in the same electrospinning method as the method of forming the first heat insulating member 100, and the thickness of the adhesive layer 130 can be freely determined because the thickness is determined according to the amount of the adhesive material. .

The adhesive layer 130 may be formed on the second heat insulating member 120 as shown in FIG. 3A, or may be formed on the first heat insulating member 100 as shown in FIG. 3B. In addition, the adhesive layer 130 may be formed on the heat spreader 110 in the structures of Figs. 1B and 1C.

In addition, in the laminated structure of the composite sheet, the adhesive layer 130 may be interposed between the first heat insulating member 100, the heat spreader 110, and the second heat insulating member 120, respectively.

4A to 4C are conceptual cross-sectional views showing a state in which a double-sided tape is applied to the composite sheet according to the first to third embodiments of the present invention.

The double-sided tapes 151 and 152 may be interposed between the stacked layers of the first heat insulating member 100, the heat spreader 110 and the second heat insulating member 120 of the composite sheet (Fig. 4A) The double-sided tape 153 is adhered to one of the first heat insulating member 100, the heat spreader 110 and the second heat insulating member 120 exposed on the upper or lower portion of the composite sheet having the laminated structure as shown in FIG. 1C . Here, in FIG. 4B, the double-faced tape 153 is bonded to the second heat insulating member 120.

4C, the composite sheet may include a second heat insulating member 120, a first double-sided tape 154 bonded to the upper portion of the second heat insulating member 120, A second double-sided tape 155 adhered to a lower portion of the heat spreader 110 and a heat spreader 110 bonded to a lower portion of the second double-sided tape 155 to disperse the transferred heat, 3 double-sided tape 156, and a first heat insulating member 100 bonded to a lower portion of the third double-sided tape 156.

Here, the double-sided tapes 151, 152, 153, 154, 155, and 156 use, for example, a tape having an adhesive layer on both sides of a PET (polyethylene terephthalate) film.

The second heat insulating member 120 described above may use a ribbon of a thin plate made of an amorphous alloy or a nano-crystal alloy. The amorphous alloy may be an Fe-based or a Co-based magnetic alloy, and it is preferable to use an Fe-based magnetic alloy in consideration of material cost.

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

Since the second heat insulating member 120 has a thermal conductivity of 3-4 W / mK in the horizontal direction and a thermal conductivity of 0.4 W / mK in the vertical direction, heat dissipation due to heat diffusion is excellent but heat transfer in the vertical direction is suppressed Insulation efficiency can also be obtained.

FIG. 5 is a cross-sectional view of a composite sheet according to a fourth embodiment of the present invention, and FIG. 6 is a cross-sectional view of a composite sheet according to a fifth embodiment of the present invention.

Referring to FIG. 5, the composite sheet according to the fourth embodiment includes a laminate structure 180 in which a first heat insulating member, a heat spreader, and a second heat insulating member are stacked, and an electroconductive adhesive layer 160 .

The electrically conductive adhesive layer 160 can be formed by the electrospinning device in the same manner as the first insulating member and the electrically insulating adhesive layer 160 is formed on the second insulating member of the laminated structure 180 . At this time, the electrically conductive adhesive layer 160 may be applied as an electrically conductive adhesive film and attached to one surface of the second heat insulating member.

When such an electrically conductive adhesive layer 160 is formed by an electrospinning device, a polymer solution capable of electrospinning, an electrically conductive adhesive material, and a solvent are mixed at a predetermined ratio to prepare a spinning solution, and this spinning solution is electrospun And the nanofibers are accumulated and formed into a nanoparticle-type nanofiber web.

As described above, the composite sheet according to the fifth embodiment includes the electrically conductive adhesive layer 160 to absorb electromagnetic waves, thereby further improving the electromagnetic wave shielding efficiency.

6, the composite sheet according to the fifth embodiment further forms a color cover layer 170 having various colors in a laminated structure 180 in which a first heat insulating member, a heat spreader, and a second heat insulating member are stacked. Respectively.

When the composite sheet according to the fifth embodiment is used in a portion exposed to the outside, the color cover layer 170 having various colors may be provided at a portion exposed to the outside of the composite sheet, so that the design can be made beautiful.

The color cover layer 170 may be formed by coating a coating material of a color hue on the surface of the second insulating member, and a single-sided adhesive tape having a color hue on one surface thereof may be used.

At this time, the color cover layer 170 may be laminated to the second heat insulating member of the laminated structure 180 of the composite sheet.

For example, when the composite sheet of the present invention is attached to the inner surface of the cover of the portable terminal, if the cover is detached from the body, the inner surface of the cover is exposed to the outside. Accordingly, the color cover layer 170 is formed in the same color as the cover, such as forming a white color when the cover is white and a black color when the cover is black.

7A and 7B are conceptual sectional views illustrating a portable terminal equipped with a composite sheet according to an embodiment of the present invention.

The composite sheet according to an embodiment of the present invention can be mounted on a portable terminal. When the composite sheet is mounted on the portable terminal, the heat generated in the portable terminal is blocked by the first heat insulating member, spot is dispersed in the heat spreader, thereby minimizing the thermal influence applied to the internal parts of the portable terminal and preventing the heat generated in the hot spot from leaking to the outside, thereby gripping the portable terminal Thereby minimizing the heat transmitted to the heat exchanger.

In the present invention, as shown in FIG. 7A, the composite sheet 300 can be installed inside the rear cover 210 of the portable terminal. Here, the portable terminal includes a terminal body 200 that performs a portable terminal function; And a rear cover 210 detachable from the rear surface of the terminal main body 200. The rear cover 210 is detachably attached to the rear surface of the main body 200. The rear cover 210 is provided at a rear surface of the main body 200, Lt; / RTI >

In the present invention, as shown in FIG. 7B, the composite sheet 300 is adhered to the rear surface of the display unit 250 of the portable terminal, so that the heat transmitted through the display unit 250 can be suppressed. For reference, since the display unit 250 is exposed from the outer case 260 of the terminal body of the portable terminal, heat can be applied to the user through the display unit 250.

That is, the portable terminal includes a terminal body that performs a portable terminal function; A display unit 250 exposed to the terminal body; And a composite sheet 300 bonded to the rear surface of the display unit. Here, the composite sheet 300 is embedded in the terminal body, and is bonded to the opposite surface of the exposed portion of the display unit 250 exposed to the terminal body.

The composite sheet 300 may be attached to the rear cover 210 or the rear surface of the display unit 250 so that the second heat insulating member or the first heat insulating member is close to the rear surface of the rear cover 210 or the display unit 250. [ . That is, the second thermal insulating member or the first thermal insulating member can be adhered to the rear cover 210 of the portable terminal or the back surface of the display unit 250 in two modes.

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.

100: first heat insulating member 101: nonwoven fabric
102, 103: Nano fiber web 110: Heat spreader
120: second heat insulating member 130: adhesive layer
151, 152, 153, 154, 155, 156: double-sided tape 160: electrically conductive adhesive layer
170: color cover layer 180: laminated structure
200: terminal body 210: rear cover
250: display part 260: outer case
300: composite sheet

Claims (12)

A first heat insulating member having a plurality of micropores forming an air pocket for heat insulation; A heat spreader for diffusing heat to dissipate heat; And a second heat insulating member which facilitates transfer of the conducted heat in the horizontal direction but suppresses the transfer in the vertical direction. 2. The heat exchanger according to claim 1,
And a magnetic sheet having a thermal conductivity ratio in a vertical direction to a horizontal direction thermal conductivity of 10: 1 or more. 3. The heat exchanger according to claim 2,
A composite sheet comprising a magnetic sheet having a specific resistance of at least 100 or more. The method according to claim 2 or 3,
Wherein the magnetic sheet is a Fe-based amorphous alloy or a Co-based amorphous alloy. 5. The method of claim 4,
Wherein the Fe-based amorphous alloy is an Fe-Si-B alloy or an Fe-Si-B-Cu-Nb alloy. The magnetic sheet according to claim 4,
A plurality of fine pieces separated in a fine size are arranged adjacently, and an adhesive member is attached to either one of the upper side and the lower side, and the upper side and the lower side of the composite sheet, . The method according to claim 1,
Wherein the heat spreader is a thin metal sheet having a thermal conductivity of 200 W / m · K or more. 8. The method of claim 7,
Wherein the metal thin plate is Cu or Al. The semiconductor device according to claim 1,
A structure in which the first heat insulating member, the heat spreader, and the second heat insulating member are stacked in this order;
A structure in which the heat spreader, the first heat insulating member and the second heat insulating member are stacked in this order; And
A structure in which the heat spreader, the second heat insulating member and the first heat insulating member are stacked in this order; A composite sheet. The method according to claim 1,
Wherein the first heat insulating member is one of a nanofiber web, a nonwoven fabric, and a laminated structure thereof. The composite sheet according to claim 1, further comprising an adhesive layer laminated on the first heat insulating member. A terminal body;
A rear cover detachable from the rear surface of the terminal body;
A display unit exposed on the terminal body; And
And a composite sheet adhered to the inside of the rear cover or the rear surface of the display unit,
A first heat insulating member having a plurality of micropores forming an air pocket for heat insulation; A heat spreader for diffusing heat to dissipate heat; And a second heat insulating member which facilitates transfer of the conducted heat in the horizontal direction but suppresses the transfer in the vertical direction.

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