KR20150080439A - 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 comprises a heat spreader diffusing and radiating heat; and a magnetic sheet stacked on the heat spreader, and secondarily diffusing heat saturated in the heat spreader, and controlling heat transfer in vertical direction.

Description

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

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite sheet, and more particularly, to a composite sheet capable of performing heat radiation and heat transfer suppression with an ultra-thin sheet and a portable terminal having the same.

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.

Accordingly, the inventors of the present invention have continued to research on a technique capable of suppressing the transfer of heat generated in the portable terminal, thereby inventing the structural characteristics of the sheet capable of performing heat radiation and heat transfer suppression functions, , And completed the present invention which is usable 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 heat radiation and heat transfer suppression with an ultra-thin sheet and a portable terminal having the composite sheet.

Another object of the present invention is to provide a composite sheet capable of improving heat radiation efficiency by dispersing heat generated from a hot spot by using a heat spreader, and a portable terminal having the composite sheet.

According to an aspect of the present invention, there is provided a heat spreader for diffusing heat to dissipate heat; And a magnetic sheet laminated on the heat spreader to diffuse the heat saturated in the heat spreader secondarily and to inhibit heat transfer in the vertical direction.

Here, the magnetic sheet may be configured such that a plurality of fine pieces separated in a fine size are disposed adjacent to each other, and an adhesive member is attached to one or both of upper and lower portions of the magnetic sheet, Based amorphous sheet or nano-crystal grain sheet that is partially insulated and processed.

According to another aspect of the present invention, there is provided a portable terminal comprising: a terminal body for performing a portable terminal function; A rear cover detachable from the rear surface of the terminal body; A display unit exposed on the terminal body; And a composite sheet bonded to the inside of the rear cover or the rear surface of the display unit, wherein the composite sheet includes a heat spreader for diffusing heat to dissipate heat; And a magnetic sheet laminated on the heat spreader to diffuse the heat saturated in the heat spreader secondarily and to inhibit heat transfer in the vertical direction.

As described above, in the present invention, it is possible to realize a multifunctional ultra-thin sheet capable of suppressing heat radiation and heat transfer, and it is advantageous in that manufacturing cost can be reduced by eliminating the application of separate separate sheets for heat dissipation and heat transfer suppression have.

In the present invention, heat generated by a hot spot of a portable terminal is dispersed by a heat spreader to minimize thermal influence applied to internal parts of the portable terminal, and heat generated from the hot spot is prevented from leaking to the outside, There is an advantage that the heat transmitted to the user who grips the terminal can be minimized.

1 is a conceptual sectional view for explaining a composite sheet according to an embodiment of the present invention,
2 is a conceptual sectional view for explaining the structure of a double-sided tape applied to a composite sheet according to an embodiment of the present invention,
3 is a conceptual cross-sectional view illustrating a laminated structure of a composite sheet according to an embodiment of the present invention,
4A and 4B are conceptual sectional views illustrating a portable terminal equipped with a composite sheet according to an embodiment of the present invention.

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

Referring to FIG. 1, a composite sheet according to an embodiment of the present invention includes a magnetic sheet 100 for spreading conducted heat and suppressing heat transfer in a vertical direction; A first double-sided tape 110 adhered to an upper portion of the magnetic sheet 100; A second double-sided tape (120) adhered to a lower portion of the magnetic sheet (100); And a heat spreader 130 adhered to the lower surface of the second double-sided tape 120 and diffusing heat to dissipate heat.

Here, the first and second double-sided tapes 110 and 120 applied to the composite sheet of the present invention are adhesive members, and the structure of FIG. 1 is an example of a composite sheet. The heat spreader 130 ); And a plurality of fine pieces which are laminated on the heat spreader 130 and are separated to a fine size are disposed adjacent to each other. Adhesive members are attached to one or both of upper and lower portions of the heat spreader 130, The gap may be wholly or partly insulated to form a composite sheet including a magnetic sheet 100 that secondarily diffuses the heat saturated in the heat spreader 130 and inhibits heat transfer in the vertical direction . Here, the bonding member includes a double-sided tape.

Therefore, in the composite sheet according to the embodiment of the present invention, the heat spreader 130 disperses the transmitted heat to perform the heat dissipating function, and the magnetic sheet 100 diffuses the conducted heat in the second order, And has a merit that it is possible to implement a multi-functional sheet capable of performing heat dissipation and heat transfer suppression in one sheet.

Here, the heat spreader 130 is preferably applied as a metal material. Nickel plating may be performed on the heat spreader 130 of the copper material to solve oxidation and corrosion problems.

Further, the heat spreader 130 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.

 The magnetic sheet 100 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 100 may be made 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 100 may be separated into a plurality of pieces or 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 insulating process may be performed by allowing a part of the adhesive provided on the adhesive member to penetrate into the gap.

At this time, it is preferable that many pieces of the magnetic sheet 100 have an irregular size of several tens of μm to 3 mm or less, and the pieces of the magnetic sheet 100 may have the same shape or different shapes, and may be a random shape.

The thickness of the magnetic sheet 100 may be 5 to 50 mu m.

Further, since the magnetic sheet 100 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, Can be obtained.

The magnetic sheet 100 described above may use a ribbon of a thin plate made of an amorphous alloy or a nanocrystalline 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-based magnetic alloy can be, for example, an Fe-Si-B alloy, and it is preferable that Fe is 70-90 atomic%, and the sum of Si and B is 10-30 atomic%. The higher the content of Fe and other metals, the higher the saturation magnetic flux density. However, when the content of Fe element is excessive, it is difficult to form amorphous. Therefore, in the present invention, the content of Fe is preferably 70-90 atomic%. When the sum of Si and B is in the range of 10-30 atomic%, the amorphous formability of the alloy is the most excellent. In order to prevent corrosion in such a basic composition, corrosion resistance elements such as Cr and Co may be added in an amount of 20 atomic% or less, and a small amount of other metal elements may be added as needed to impart different properties.

For example, the Fe-Si-B alloy may have a crystallization temperature of 508 캜 and a Curie temperature (Tc) of 399 캜. However, such a crystallization temperature can be varied depending on the content of Si and B, or other metal elements added in addition to the ternary alloy component and its content. In the present invention, an Fe-Si-B-Co alloy may be used as the Fe-based amorphous alloy, if necessary.

The Fe-based nano-crystal magnetic alloy used for the magnetic sheet 100 may be Fe-Si-B-Cu-Nb alloy. In this case, the Fe content is 73-80 at% 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 a heat treatment to be described later.

Further, the first double-sided tape 110 may be formed, for example, on one side of a PET (polyethylene terephthalate) film with an adhesive layer. The thickness of the first double-sided tape 110 is preferably larger than the thickness of the second double-sided tape 120. That is, the first double-sided tape 110 must have a predetermined thickness for the purpose of protecting the magnetic sheet 100. The second double-sided tape 120 may be formed by bonding the magnetic sheet 100 and the heat spreader 130 The thickness of the second double-sided tape 120 is formed to be thinner than the thickness of the first double-sided tape 110.

At this time, the first double-sided tape 110 may have a thickness of 10 um to 30 um, and the second double-sided tape 120 may have a thickness of 1 um to 9 um.

As described above, the composite sheet of the present invention can be realized as an ultra-thin sheet having a thickness of several tens of um, and can perform heat radiation and heat transfer suppression functions with a single sheet.

Referring to FIG. 2, the second double-sided tape 120 includes adhesive layers 120b and 120c formed on both sides of a substrate 120a made of a fluororesin film such as a polyethylene terephthalate (PET) film.

As the adhesive layers 120b and 120c, for example, an acrylic adhesive may be used, and other types of adhesives may be used. The release film is integrally adhered to the adhesive layers 120b and 120c at the time of manufacturing the double-sided tape, and is peeled off when the composite sheet according to the present invention is attached to an electronic apparatus.

Referring to FIG. 3, the composite sheet according to an embodiment of the present invention may include a plurality of magnetic sheets. At this time, the double-sided tapes 120A ₁ , 120A ₂ , and 120A ₃ bonded to the lower portions of the magnetic sheets 100A ₁ , 100A ₂ , and 100A ₃ are repeatedly stacked on the heat spreader 130. That is, the magnetic sheet (100A _1), and double-faced tape (120A _1), a magnetic sheet to the stack the first set, and the first magnetic sheet (100A ₁₎ of the set of (100A _2), and double-sided tape to the heat spreader 130 stacking a second set of (120A _2), and is laminated to the third set of magnetic sheet (100A ₂₎ magnetic sheet (100A ₃₎ and double-faced tape (120A ₃₎ in the second set. When the composite sheet includes a plurality of magnetic sheets 100A ₁ , 100A ₂ , and 100A ₃ , the heat transfer suppressing ability is improved and the electromagnetic shielding function is also excellent.

4A and 4B 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, and when the composite sheet is mounted on the portable terminal, it is possible to perform the heat distribution function and the heat transfer suppression function generated in the portable terminal, A user who is gripping a portable terminal by minimizing the thermal influence applied to the internal parts of the portable terminal by dissipating heat generated from the hot spot of the portable terminal and preventing the heat generated from the hot spot from leaking to the outside, Thereby minimizing the heat transmitted to the heat exchanger.

In the present invention, as shown in FIG. 4A, 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 > Here, the rear cover 210 may be referred to as a battery cover.

In the present invention, as shown in FIG. 4B, the composite sheet 300 is adhered to the rear surface of the display unit 250 of the portable terminal, so that the transmission of heat conducted through the display unit 250 can be suppressed. For reference, the display unit 250 is exposed from the outer case 260 of the terminal body of the portable terminal, and 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 adhered to the rear surface of the display unit 250. 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 is adhered to the rear surface of the rear cover 210 or the display unit 250 so that the magnetic sheet or the heat spreader is close to the rear surface of the rear cover 210 or the display unit 250 of the portable terminal. That is, the magnetic sheet or the heat spreader can be adhered to the back cover 210 of the portable terminal or the back surface of the display unit 250 in two modes.

Table 1 below shows a comparative example in which a sheet of a 61 占 퐉 -thick embodiment having the structure shown in Fig. 1 of the present invention including a magnetic sheet and a Cu thin plate as a heat spreader and a graphite sheet laminated with a double- 2 is mounted on the rear cover and the portable terminal of Comparative Example 1 in which the seat is not mounted on the rear cover is prepared and then the moving image is continuously operated in each of the portable terminals and the temperature change of the rear cover is opened (FLIR T420 model).

As shown in Table 1, the embodiment showing the composite sheet of the present invention showed that the heat transmitted from Comparative Example 1 in which no sheet existed was reduced and the temperature change was almost the same as that of the graphite sheet in Comparative Example 2, It can be seen that the composite sheet has excellent heat transfer suppression efficiency.

Sheet 20 minutes 30 minutes 40 minutes Comparative Example 1 (No sheet) 41.2 DEG C 41.6 DEG C 42.4 DEG C Comparative Example 2 (Graphite sheet) 38.1 DEG C 38.8 DEG C 40.1 DEG C Example (magnetic sheet + Cu thin plate) 39.1 DEG C 39.8 DEG C 40.1 DEG C

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, 100A1, 100A2, 100A2: magnetic sheet 101: microstructure
102, 105: fine space 103: crack
110, 120, 120A1, 120A2, 120A3:
120a: substrate 120b, 120c: adhesive layer
130: Heat spreader 200:
210: rear cover 250:
260: outer case 300: composite sheet

Claims (11)

A heat spreader for diffusing heat to dissipate heat; And
And a magnetic sheet laminated on the heat spreader to diffuse the heat saturated in the heat spreader secondarily and to suppress heat transfer in the vertical direction. The magnetic sheet according to claim 1, wherein the magnetic sheet comprises a plurality of fine pieces separated in a fine size, and an adhesive member is attached to one or both of the upper and lower portions of the magnetic sheet, The gaps may be wholly or partly insulated composite sheets. The composite sheet according to claim 1, wherein the adhesive member comprises a double-sided tape. The magnetic recording medium 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. The magnetic recording medium according to claim 1,
A composite sheet comprising a magnetic sheet having a specific resistance of at least 100 or more. The method according to claim 4 or 5,
Wherein the magnetic sheet is a Fe-based amorphous alloy or a Co-based amorphous alloy. The method according to claim 6,
Wherein the Fe-based amorphous alloy is an Fe-Si-B alloy or an Fe-Si-B-Cu-Nb alloy. The composite sheet according to claim 1, wherein the magnetic sheet has a thickness of 5 to 50 탆. The method according to claim 1,
The heat spreader is a metal sheet having a thermal conductivity of 200 W / m · K or more, 10. The method of claim 9,
Wherein the metal thin plate is Cu or Al. A terminal body for performing a portable terminal function;
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 portion,
In the composite sheet,
A heat spreader for diffusing heat to dissipate heat; And
And a magnetic sheet laminated on the heat spreader to diffuse the heat saturated in the heat spreader secondarily and to inhibit heat transfer in the vertical direction.

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