KR20160005236A - Heat dissipation sheet unified NFC antenna and electronic equipment having the same - Google Patents

Abstract

The present invention relates to a near field communications (NFC) antenna-integrated heat dissipation sheet, and an electronic apparatus comprising the same. The NFC antenna-integrated heat dissipation sheet comprises: an NFC antenna module including an NFC antenna; and a heat dissipation member attached to the NFC antenna module, and spreading and dissipating heat generated in a heating component of the electronic apparatus.

Description

TECHNICAL FIELD [0001] The present invention relates to a heat dissipation sheet having an NFC antenna and an electronic apparatus having the same,

The present invention relates to an NFC antenna integrated type heat dissipation sheet, and more particularly, to an integrated NFC antenna heat dissipation sheet capable of improving radiation characteristics and heat dissipation efficiency of an NFC antenna with an integrated sheet and an electronic apparatus having the same.

In recent years, the technology has rapidly developed, and high-performance, light-weight, and shortened electronic devices have appeared on the market and are being commercialized.

If such an electronic device fails to dissipate heat generated internally, excessive heat accumulation may cause image retention, system failure, and shortened product life. In severe cases, it may cause explosion or fire .

Particularly, a portable terminal such as a mobile phone (smart phone) is required to be downsized and lightweight in order to maximize the portability and convenience of the user, and components integrated in smaller and smaller spaces for high performance are mounted. As a result, the parts used in the mobile terminal have higher performance and higher heat generation temperature, and the higher temperature increases the performance of the portable terminal by affecting adjacent components.

On the other hand, a portable terminal such as a mobile phone is often used in contact with a human face in use. Heat generated in the portable terminal is transmitted to the skin, resulting in a low temperature image, It is necessary to lower the heat transmitted to the outside of the mobile terminal to a certain temperature or less.

Various materials have been adopted to solve the problem caused by the heat generated by the portable terminal. However, until now, an optimal material having a thin thickness and excellent heat dissipation performance has not been developed.

Meanwhile, Korean Patent Laid-Open Publication No. 10-2012-0094380 discloses a heat dissipation adhesive layer which can be attached to a display that is a heat dissipation target; A conductive layer provided on the outside of the heat-dissipative adhesive layer so that heat generated in the display can be rapidly transmitted; And a heat dissipation sheet disposed on the outer side of the conductive layer and configured to rapidly discharge the heat conducted by the conductive layer to the outside in the vertical direction and the horizontal direction of the display.

However, such a heat-radiating sheet can be installed between the glass and the heat spreader constituting the display to efficiently dissipate the heat generated in the display in the vertical direction and the horizontal direction. However, the function of performing NFC communication And when the heat-radiating sheet is mounted on an electronic device separately from the NFC antenna module, the space utilization is lowered and the radiation function of the NFC antenna can be hindered. Thus, the recent high-performance and light- The efficiency of application to an electronic device such as a mobile terminal is low.

Korean Patent Publication No. 10-2012-0094380

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 an NFC antenna integrated type heat dissipating device capable of realizing an NFC communication function and a heat radiation function in a single sheet, Sheet and an electronic apparatus having the same.

Another object of the present invention is to provide an NFC antenna-integrated heat-radiating sheet suitable for an electronic apparatus which is realized with high performance and light weight and short life by implementing an ultra-thin thickness sheet, and an electronic apparatus having the same.

Another object of the present invention is to provide an NFC antenna-integrated heat-radiating sheet and an electronic apparatus having the NFC-incorporated heat-radiating sheet, which can significantly reduce the manufacturing cost without using an expensive heat-

According to an aspect of the present invention, there is provided an NFC antenna integrated type heat dissipation sheet including: an NFC antenna module including an NFC antenna; And a heat dissipating member attached to the NFC antenna module for spreading and radiating heat generated from a heat generating component of the electronic device.

According to another aspect of the present invention, there is provided an electronic apparatus comprising: a main board on which components for driving a portable terminal are mounted; A rear cover covering the main board; And a back cover spaced apart from the rear cover and detachably attached to the rear cover, wherein the back cover or the rear cover is provided with an NFC communication function and heat transmitted from the heat generating component, And an NFC antenna integrated type heat dissipation sheet for suppressing external transmission of the heat to maintain an external temperature of the electronic device at a predetermined temperature or lower, including a heat dissipation function for dissipating heat.

In the present invention, it is possible to efficiently heat the heat generated from the heat-generating component of the electronic device without interfering with the radiation function of the NFC antenna by stacking the sheets in an optimized manner so as to perform the NFC communication function on the front surface and perform the heat- And the radiation characteristic of the NFC antenna can be improved.

According to the present invention, it is possible to provide a hybrid sheet suitable for electronic equipment which is high-performance and light-weight and short-life because an ultra-thin heat radiation member is adhered to the NFC antenna module and integrated.

In the present invention, it is advantageous to attach a heat dissipating member of ultra-thin thickness to a sheet-like NFC antenna module in a large area to increase the heat dissipation property and to avoid the use of expensive heat dissipation sheet, thereby reducing manufacturing costs.

According to the present invention, heat generated from a heat generating component of an electronic device is diffused and heat dissipated, heat dissipated, and adiabated, thereby preventing deterioration of the exothermic component and lowering the temperature of heat transmitted from the exothermic component to the other component.

The temperature of the heat transmitted from the heat generating component of the electronic device to the outside of the electronic device can be lowered to maintain the temperature of the front and rear surfaces of the electronic device below the predetermined temperature.

1 is a sectional view of an NFC antenna integrated type heat radiation sheet according to the present invention,
FIG. 2 is a cross-sectional view of an NFC antenna module applied to an NFC antenna integrated type heat radiating sheet according to the present invention,
3 is a cross-sectional view of a heat dissipating member applied to an NFC antenna integrated type heat radiation sheet according to the present invention,
4 is a cross-sectional view of a modification of the heat dissipating member applied to the NFC antenna integrated type heat radiation sheet according to the present invention,
5 is a schematic sectional view illustrating a state in which the NFC antenna integrated type heat radiation sheet according to the present invention is installed on a back cover of a portable terminal;
6 is a schematic sectional view for explaining a state in which the NFC antenna integrated heat radiating sheet according to the present invention is installed on a rear cover of a portable terminal.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 1, the NFC antenna integrated heat dissipation sheet 100 according to the present invention includes an NFC antenna module 110 including an NFC antenna; And a heat dissipating member 120 adhered to the NFC antenna module 110 and spreading heat generated from a heat generating component of the electronic device to dissipate heat.

The NFC antenna integrated type heat dissipation sheet 100 according to the present invention performs an NFC communication function on the front surface and maintains an optimized arrangement relationship capable of performing a heat radiation function on the rear surface, It is possible to efficiently dissipate the heat generated from the heat generating component of the electronic device and to excellently radiate the NFC antenna.

Since the NFC antenna integrated heat dissipation sheet 100 has the ultra thin heat dissipating member 120 adhered to the NFC antenna module 110 so that the internal space of the electronic device can be further secured, It is possible to improve the usability as a suitable part for the electronic device having the function.

That is, when the NFC antenna module 110 and the heat radiating member 120 are separately mounted in different areas of the electronic equipment, the separated NFC antenna module 110 and the heat radiating member 120 Each occupying a predetermined area, and the space utilization is reduced.

In addition, the NFC antenna integrated heat dissipation sheet 100 according to the present invention can adhere the ultra-thin heat dissipation member 120 with a large area to the bottom surface of the sheeted NFC antenna module 110, There is an advantage in that price competitiveness can be ensured even if an expensive heat-dissipating sheet is not used.

The NFC antenna module is a module including an antenna for performing NFC communication in an electronic device, and includes a substrate on which an NFC antenna is formed and an adhesive layer.

As shown in FIG. 2, the NFC antenna module includes a substrate 111 on which an NFC antenna is formed, first and second adhesive layers 113a and 113b formed on both sides of the substrate 111, And a third adhesive layer 113c formed on the other surface of the electromagnetic wave shielding sheet 112. [

Here, the substrate 111 can be used as an FPCB (Flexible Printed Circuit Board), and an NFC antenna pattern is formed on the FPCB. In this case, the NFC antenna can be divided into a single-sided loop NFC antenna and a double-sided loop NFC antenna. In the double-sided loop NFC antenna, terminal portions respectively formed at the start end and the end of the loop NFC antenna pattern are formed on the same surface of the substrate 111, and the double-sided loop NFC antenna has terminal portions formed on different surfaces of the substrate 111 do.

The first adhesive layer 113a formed on one surface of the substrate 111 on which the NFC antenna is formed is for adhering to a component of the electronic device (for example, a back cover of a portable terminal described later) The second adhesive layer 113b is for adhering to the electromagnetic wave shielding sheet 112.

The third adhesive layer 113c is for adhering to the heat dissipating member 120 described above.

The electromagnetic wave shielding sheet 112 absorbs electromagnetic waves generated from components incorporated in the electronic device to perform an electromagnetic wave shielding function. The electromagnetic wave shielding sheet 112 is made of an amorphous alloy or a nano- Sheet; Amorphous ribbon; ferrite; And a polymer sheet comprising magnetic powder; Can be used.

FIG. 3 is a cross-sectional view of a heat dissipating member applied to an NFC antenna integrated type heat radiation sheet according to the present invention, and FIG. 4 is a sectional view of a heat radiation member applied to an NFC integrated heat radiation sheet according to the present invention.

The heat dissipating member applied to the NFC antenna integrated type heat dissipation sheet according to the present invention may use all of the materials made of a material capable of dissipating transmitted heat to dissipate heat.

3, the heat dissipating member may include a heat dissipation layer 121 for dissipating heat by dissipating heat and an adhesive layer 122 formed on the heat dissipation layer 121.

The heat dissipation layer 121 may include a sheet-like member having a thermal conductivity of at least 200 W / mk.

Preferably, the heat dissipation layer 121 may be made of any one of Cu, Al, Ag, Ni, and graphite, or a combination thereof, having a thermal conductivity of about 200 to 3000 W / mk. Taking into consideration the unit price and characteristics, a laminated structure of Cu or graphite, copper and graphite can be preferably applied.

The heat dissipation layer 121 may include a first heat dissipation layer having a first thermal conductivity and diffusing the transmitted heat. And a second heat dissipation layer bonded to the first heat dissipation layer and having a second thermal conductivity different from the first thermal conductivity and diffusing heat transmitted from the first heat dissipation layer.

Here, the first thermal conductivity of the first heat dissipation layer may be equal to or different from the second thermal conductivity of the second heat dissipation layer. When the first and second thermal conductivity ratios are different, the first thermal conductivity of the first heat dissipation layer is lower than the second thermal conductivity of the second heat dissipation layer, and the first heat dissipation layer having a relatively low thermal conductivity is attached to, Are combined into one state.

The first heat dissipation layer and the second heat dissipation layer may be diffusion bonded. In this case, a bonding layer formed by diffusion bonding may be formed between the first heat dissipation layer and the second heat dissipation layer.

At this time, the first structure in which the first heat dissipation layer is made of one of Al, Mg, and Au and the second heat dissipation layer is made of Cu; A second structure in which the first heat dissipation layer is made of Cu and the second heat dissipation layer is made of Ag; And a third structure in which the first heat dissipation layer is made of one of Al, Mg, Au, Ag and Cu and the second heat dissipation layer is made of graphite; As shown in FIG.

The adhesive layer 122 may be one of acryl, epoxy, aramid, urethane, polyamide, polyethylen, EVA, polyester, and PVC Or may be a hot melt adhesive sheet in a web state or in an inorganic state having a plurality of pores in which fibers capable of heat bonding are accumulated and which have a plurality of pores.

4, the heat dissipating member includes a heat dissipating layer 121 for dissipating heat by dissipating heat, an adhesive layer 122 formed on the heat dissipating layer 121, a heat insulating layer 122 for adhering one surface to the adhesive layer 122, (123) and an adhesive layer (122a) formed on the other surface of the heat insulating layer (123).

Here, the adhesive layer 122a formed on the other side of the heat insulating layer 123 is for adhering to parts of electronic equipment.

The heat insulating layer 123 may include a sheet member having a thermal conductivity of 20 W / mk or less. The heat insulating layer 123 may be formed of a porous substrate or a graphite layer having a plurality of micropores for forming an air pocket capable of trapping air.

Here, the porous substrate traps air in a plurality of micropores to suppress air convection, thereby making it possible to use air as a heat insulating material.

The porous substrate may be, for example, a nano-web having a plurality of pores by an electrospinning method, a nonwoven fabric having a plurality of pores, a polyether sulfone (PES), etc., And any material can be applied as long as it is a material capable of vertical insulation. Here, it is preferable that the pore size of the porous substrate is less than 5 mu m at most from several tens nm.

Preferably, the porous substrate may be one of a nanofiber web having a plurality of pores formed by accumulation of nanofibers, a nonwoven fabric, and a laminated structure thereof.

Here, the nanofiber web is prepared by preparing a spinning solution by mixing a polymer material having excellent heat resistance and a solvent at a predetermined ratio, forming a nanofiber by electrospinning the spinning solution, accumulating the nanofiber, And is formed in the form of a nano web having fine pores.

As the diameter of the nanofibers is smaller, the specific surface area of the nanofibers is increased and the air trapping ability of the nanofiber web having a plurality of micropores is increased, so that the heat insulating performance is improved. Therefore, it is preferable that the diameter of the nanofiber is in the range of 0.3 to 5 um and the porosity of the micropores is in the range of 50 to 80%.

In general, air is known as an excellent thermal insulation material with low thermal conductivity, but it can not be used as a thermal insulation material by convection or the like. However, since the heat insulating sheet according to the present invention is formed in the form of a nanoweb having a plurality of micropores, air is not convected in each micropores and trapped (trapped). It is.

The spinning method applied to the present invention can be applied to a variety of spinning processes including general electrospinning, air-electrospinning (AES), electrospray, electrobrown spinning, centrifugal electrospinning, Any one of flash-electrospinning may be used.

Polymer materials used to make nanofiber webs include, for example, low polymer polyurethanes, high polymer polyurethanes, polystyrene (PS), polyvinylalcohol (PVA), polymethyl methacrylate (PMMA), polylactic acid (PLA) (PVA), polyvinylpyrrolidone (PVP), polyvinylchloride (PVC), nylon (Nylon), polyacrylonitrile (PAN) ), Polycarbonate (PC), polyetherimide (PEI), polyvinylidene fluoride (PVdF), polyetherimide (PEI), and polyestheresulphone (PES).

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 nanofiber web is manufactured by the electrospinning method, the thickness is determined according to the spinning amount of the spinning solution. Therefore, there is an advantage in that it is easy to make the thickness of the nanofiber web to a desired thickness.

As described above, since the nanofiber web is formed as a nanofiber web in which the nanofibers are accumulated by the spinning method, it can be formed into a form having a plurality of micropores without any additional process, and the size of the micropores It is also possible to control. Therefore, it is possible to finely form a large number of pores, so that the heat transfer inhibiting performance is excellent and the heat insulating performance can be improved.

As described above, in the NFC antenna integrated heat dissipation sheet of the present invention, when the adhesive layer formed on the NFC antenna module and the heat dissipation member is exposed to the outside, the handling properties such as transportation and storage may be deteriorated due to the adhesive property of the adhesive layer. , The releasing member is bonded to the adhesive layer exposed at the outermost periphery (the upper surface or the lower surface of the heat radiation sheet) of the NFC antenna integrated heat dissipation sheet.

That is, the release member functions to protect the adhesive layer by adhering to the adhesive layer before the NFC antenna integrated heat radiating sheet is attached to the electronic component, separates the release member, attaches the NFC antenna integrated heat radiating sheet to the electronic component .

Such a release member can be made of a resin material such as a PET film, and a fiber material other than a resin material can be used.

FIG. 5 is a schematic sectional view illustrating a state in which the NFC antenna integrated type heat radiating sheet according to the present invention is installed on a back cover of a portable terminal. FIG. 6 is a cross- Sectional view for explaining a state where the cover is installed on the cover.

As described above, the NFC antenna integrated type heat radiating sheet according to the present invention is bonded to the internal components of the electronic device to enable the NFC communication function in the electronic device and to dissipate the heat transmitted from the heat generating component of the electronic device.

Here, the electronic device may be any portable electronic device such as a mobile phone, a smart phone, a notebook computer, a digital broadcast terminal, a PDA (personal digital assistant), a portable multimedia player (PMP) A refrigerator, and the like. Especially, the NFC antenna integrated heat-radiating sheet of the present invention can be very usefully applied to a portable terminal in which a problem of heat generation is rising.

In such a portable terminal, various heat generating components such as a battery are built in the terminal body, and a lot of heat is generated. When the terminal usage time is prolonged, the heat generated in the terminal body is transmitted to the body to cause burns or an uncomfortable feeling in use.

Accordingly, in the present invention, an NFC antenna integrated heat radiating sheet is attached to a back cover or a rear cover of a portable terminal to enable an NFC communication function, heat dissipated from the heat generated by the heat generating component of the portable terminal, It is possible to minimize the heat transmitted to the user who is gripping the portable terminal and prevent the user who is in contact with the portable terminal from wearing the low temperature image.

That is, as shown in FIGS. 5 and 6, the portable terminal includes a main board 530 on which various components for driving the portable terminal are mounted; A rear cover 520 covering the main board 530; And a back cover 510 spaced apart from the rear cover 520 and detachably attached to the rear cover 520.

A front cover (not shown) located on the front surface of the portable terminal forms a predetermined space between the rear cover and a space between the front cover and the rear cover. In a space between the front cover and the rear cover, Parts are built in. A separate case for joining the front cover and the rear cover may be provided.

In the front cover, a display panel capable of displaying a screen such as an OLED panel or an LCD panel is exposed, and the back cover is coupled to the rear cover or is coupled to the case.

In the portable terminal configured as described above, it is preferable that the NFC antenna integrated heat dissipation sheet 100 of the present invention is mounted on the back cover 510 or the rear cover 520.

At this time, the rear cover 520 is provided with a battery receiving groove 521 capable of accommodating the battery 550. The NFC antenna integrated type heat radiating sheet 100 has a receiving groove 521 Can be adhered to the surface of the rear cover 520 which is not formed.

When the NFC antenna integrated heat dissipation sheet 100 is bonded to the back cover 510, the first adhesive 113a formed on the substrate 111 is bonded to the back cover 510 in the NFC antenna module of FIG.

When the NFC antenna integrated heat dissipation sheet 100 is bonded to the rear cover 520, the adhesive layer 122a formed on the other surface of the heat insulating layer 123 in the heat dissipating member structure of FIG. 4 is bonded to the rear cover 520.

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.

The present invention provides an NFC antenna integrated type heat radiation sheet capable of realizing an NFC communication function and a heat dissipation function in an integrated sheet, thereby improving the radiation characteristic of the NFC antenna and improving the heat radiation efficiency.

100: NFC antenna integrated heat dissipation sheet 110: NFC antenna module
111: substrate 112: electromagnetic wave shielding sheet
113A, 113B, 113C, 122, and 122a: an adhesive layer 120:
121: heat dissipation layer 123:
510: back cover 520: rear cover
530: Motherboard

Claims (14)

An NFC antenna module including an NFC antenna; And
And a heat dissipating member bonded to the NFC antenna module for spreading and radiating heat generated from a heat generating component of the electronic device. The method according to claim 1,
The NFC antenna module includes a substrate on which an NFC antenna is formed, first and second adhesive layers formed on both sides of the substrate, an electromagnetic wave shielding sheet having one side bonded to the second adhesive layer, and a third adhesive layer formed on the other side of the electromagnetic wave shielding sheet NFC antenna integrated heat spreading sheet. 3. The method of claim 2,
The electromagnetic wave shielding sheet may include a magnetic sheet obtained by heat treating a ribbon of an amorphous alloy or a nano-crystal alloy and then subjecting the sheet to flake treatment; Amorphous ribbon; ferrite; And a polymer sheet comprising magnetic powder; One of the NFC antenna heat sinks. 3. The method of claim 2,
The first, second, and third adhesive layers may be acrylic, epoxy, aramid, urethane, polyamide, polyethylen, EVA, polyester, Or a hot melt adhesive sheet in a web state or an inorganic ball state having a plurality of pores in which fibers capable of being thermally adhered are accumulated. The method according to claim 1,
Wherein the heat dissipation member includes a heat dissipation layer for dissipating heat by dissipating heat and an adhesive layer formed on the heat dissipation layer. 6. The method of claim 5,
Wherein the heat dissipation layer includes a sheet-like member having a thermal conductivity of at least 200 W / mk or more. 6. The method of claim 5,
Wherein the heat dissipation layer is made of a material selected from the group consisting of Cu, Al, Ag, Ni, and graphite, or a combination thereof. 6. The method of claim 5,
The heat dissipation layer may include a first heat dissipation layer having a first thermal conductivity and diffusing the transmitted heat; And a second heat dissipation layer joined to the first heat dissipation layer and having a second heat conductivity different from the first heat dissipation factor and diffusing heat transmitted from the first heat dissipation layer. 6. The method of claim 5,
Further comprising a heat insulating layer bonded to one side of the adhesive layer and inhibiting the transmission of heat, and an adhesive layer formed on the other side of the heat insulating layer. 10. The method of claim 9,
Wherein the heat insulating layer includes a sheet-like member having a thermal conductivity of 20 W / mk or less. 10. The method of claim 9,
Wherein the heat insulating layer is a porous substrate or a graphite layer having a plurality of micropores forming air pockets capable of trapping air. 12. The method of claim 11,
Wherein the porous substrate is one of a nanofiber web having a plurality of pores formed by accumulation of nanofibers, a nonwoven fabric, and a laminated structure thereof. 13. The method of claim 12,
The nanofiber web may be a low polymer polyurethane, a high polymer polyurethane, a polystyrene, a polyvinylalcohol (PVA), a polymethyl methacrylate (PMMA), a polylactic acid (PLA), a polyethylene oxide (PVA), a polyvinylacetate ), Polyacrylic acid (PAA), polycaprolactone (PCL), polyacrylonitrile (PAN), polymethyl methacrylate (PMMA), polyvinylpyrrolidone (PVP), polyvinylchloride (PVC), nylon, polycarbonate an NFC antenna integrated heat-radiating sheet consisting of one or a mixture of polyetherimide, polyvinylidene fluoride (PVdF), polyetherimide (PEI), and polyestheresulphone (PES). A main board on which parts for driving a portable terminal are mounted; A rear cover covering the main board; And a back cover spaced apart from the rear cover and detachably attached to the rear cover,
A first cover provided on the back cover or the rear cover and including an NFC communication function and a heat dissipation function for dissipating heat transmitted from the heat generating component to suppress external transmission of the heat to maintain the external temperature of the electronic device below a predetermined temperature, 15. An electronic apparatus comprising the NFC antenna integrated type heat dissipation sheet according to any one of claims 1 to 15.

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