KR102265396B1 - Hybrid sheet for digitizer, method of manufacturing the same and apparatus having the same - Google Patents

Abstract

The present invention relates to a hybrid sheet for a digitizer, a method for manufacturing the same, and an electronic device having the same, which is a hybrid sheet laminated on a digitizer panel of an electronic device to simultaneously perform electromagnetic field shielding, thermal insulation and heat dissipation functions, wherein the hybrid sheet for a digitizer generates a magnetic field A thin magnetic sheet for shielding and suppressing heat transfer in the vertical direction; a first adhesive member stacked on top of the thin magnetic sheet; a second adhesive member stacked under the thin magnetic sheet; and a heat spreader which is adhered to the thin magnetic sheet by the second adhesive member to spread the locally generated heat in a horizontal direction to dissipate heat.

Description

Hybrid sheet for digitizer, manufacturing method thereof, and electronic device having the same

The present invention relates to a hybrid sheet for a digitizer, and more particularly, a hybrid sheet for a digitizer capable of having an ultra-thin structure, suppressing heat transferred to a digitizer panel and shielding a magnetic field to prevent deterioration of digitizer function, and manufacturing thereof It relates to a method and an electronic device having the same.

In recent years, electronic products, including portable terminals, have been continuously developed, and high performance and multifunctionalization of electronic products are being promoted according to user needs.

In particular, in order to maximize the user's portability and convenience, miniaturization and weight reduction are essential for portable terminals, and components integrated in a smaller space for high performance are being mounted. Accordingly, the components used in the portable terminal have a high heating temperature due to high performance, and the increased heating temperature affects the adjacent components, thereby causing a problem of degrading the performance of the portable terminal.

In order to solve the problem of heat generation, various insulation materials have been applied to portable terminals, but until now, an optimal insulation material having a thin thickness and excellent insulation performance has not been developed, so various research and technology development for insulation is being made.

Korean Patent Publication No. 10-1134880 discloses a portable terminal having an insulation film including an insulation film disposed on the front side of the LCD, indicating that heat generated from the portable terminal is transmitted to the user's face through the LCD. There are advantages to avoiding it. However, these insulating films do not have other functions other than the heat blocking function.

For example, the electronic device as described above, particularly the electronic device having a digitizer function, applies a separate electromagnetic field shielding sheet to prevent distortion of characters due to an electromagnetic field and electromagnetic field from being transmitted to a user through the LCD.

Therefore, the inventors of the present inventors continuously conduct research on technologies that can block heat and electromagnetic fields generated in portable terminals to derive and invent structural features of sheets that can simultaneously perform heat dissipation, thermal insulation and electromagnetic field shielding functions, A more economical, usable and competitive present invention has been completed.

Korean Patent Publication No. 10-1134880

The present invention has been devised in view of the above points, and its object is to suppress the heat transferred to the digitizer panel and shield the magnetic field to prevent deterioration of the digitizer function, a manufacturing method thereof, and a method for manufacturing the same to provide electronic devices.

Another object of the present invention is to provide a hybrid sheet for a digitizer capable of performing heat dissipation, heat insulation and magnetic field shielding functions in a single sheet, a manufacturing method thereof, and an electronic device having the same.

In order to achieve the above object, a hybrid sheet for a digitizer according to an embodiment of the present invention is a hybrid sheet that is laminated on a digitizer panel of an electronic device to simultaneously perform electromagnetic field shielding, thermal insulation and heat dissipation functions. In addition, a thin magnetic sheet that suppresses heat transfer in the vertical direction; a first adhesive member stacked on top of the thin magnetic sheet; a second adhesive member stacked under the thin magnetic sheet; and a heat spreader which is adhered to the thin magnetic sheet by the second adhesive member to spread the locally generated heat in a horizontal direction to dissipate heat.

Here, the thin magnetic sheet may include a plurality of fine pieces and/or cracks formed separately by flake treatment after heat treatment of a ribbon sheet made of an Fe-based amorphous alloy, a Co-based amorphous alloy, or a nano-crystalline alloy.

In addition, the thin magnetic sheet may have a magnetic permeability of 100 to 200 uH/m, a specific resistance of 150 uΩ·cm or more, and a thickness of 5 to 50 μm at a frequency of 100 to 560 KHz, and preferably the thickness of the thin magnetic sheet is 25 to 27 μm. can

In addition, the present invention may be configured by stacking a plurality of the thin magnetic sheets.

In addition, the first and second adhesive members are double-sided tapes, and the thickness of the first adhesive member may be thicker than that of the second adhesive member.

In addition, the heat spreader may include a thin plate sheet made of a metal or non-metal having a thermal conductivity of 200 W/mK or more, and the thin plate sheet is any one of a graphite sheet, a Cu thin film, an Al thin film, and an Ag thin film, or a laminate structure thereof can be used.

A method of manufacturing a hybrid sheet for a digitizer for achieving the object of the present invention, heat-treating a ribbon made of an amorphous alloy or nano-crystalline alloy; attaching a first double-sided tape to one side of the heat-treated ribbon and attaching a second double-sided tape to the other side to form a laminated sheet, then flake-treating the laminated sheet; and adhering the heat spread to the second double-sided tape.

In addition, the present invention may further perform the step of laminating the flake-treated laminated sheet.

An electronic device for achieving the object of the present invention, a case; a display panel disposed on the front side of the case; a digitizer panel disposed on a rear surface of the display panel; and a hybrid sheet for a digitizer as described above adhered to the rear surface of the digitizer panel.

As described above, in the present invention, it is possible to manufacture in an ultra-thin shape, simplify the manufacturing process and reduce manufacturing cost, and suppress the heat transferred to the digitizer panel and shield the magnetic field to prevent deterioration of the digitizer function.

In the present invention, it is possible to implement a multifunctional ultra-thin sheet that can perform both heat dissipation, heat insulation and magnetic field shielding in one sheet, and it is possible to reduce manufacturing costs by not applying individual sheets for heat dissipation, heat insulation and magnetic field shielding. There is a point.

In the present invention, the microcavity between the plurality of micro-pieces formed on the magnetic sheet by the flake treatment and the microcavity existing in the crack function as micro pockets for heat collection, thereby collecting the transferred heat, thereby improving the insulation efficiency. there is

1 is a conceptual cross-sectional view for explaining a hybrid sheet for a digitizer according to an embodiment of the present invention,
2 is a conceptual cross-sectional view for explaining a state in which micropores are formed in a magnetic sheet of a hybrid sheet for a digitizer according to an embodiment of the present invention;
3 is a cross-sectional view showing a state in which a comparative example of the hybrid sheet of the present invention is adhered to a digitizer panel;
4 is a cross-sectional view showing a state in which the hybrid sheet of the present invention is adhered to the digitizer panel;
5 is a conceptual cross-sectional view for explaining the structure of a double-sided tape applied to a hybrid sheet for a digitizer according to an embodiment of the present invention,
6 is a conceptual cross-sectional view for explaining a laminated structure of a hybrid sheet for a digitizer according to an embodiment of the present invention;
7 is a flowchart of a method of manufacturing a hybrid sheet for a digitizer according to an embodiment of the present invention;
8 is an exploded perspective view of a portable terminal according to an embodiment of the present invention.

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

1 is a conceptual cross-sectional view for explaining a hybrid sheet for a digitizer according to an embodiment of the present invention, Figure 2 is a state in which micropores are formed in the magnetic sheet of the hybrid sheet for a digitizer according to an embodiment of the present invention It is a conceptual cross-section for

Referring to Figure 1, the hybrid sheet for a digitizer according to an embodiment of the present invention is a plurality of fine pieces (細片) (not shown) by heat-treating a ribbon of an amorphous alloy or nanocrystalline alloy and then flake-treated and / Or at least one layer of the magnetic sheet 100 in which cracks are formed and micro pockets for heat collection are formed, the first double-sided tape 110 adhered to the upper portion of the magnetic sheet 100, and the magnetic sheet 100 ) includes a second double-sided tape 120 attached to a lower portion, and a heat spreader 130 attached to a lower portion of the second double-sided tape 120 .

That is, in the hybrid sheet for a digitizer according to an embodiment of the present invention, one side of the first double-sided tape 110 is adhered to the magnetic sheet 100, and the other side of the first double-sided tape 110 is adhered to the digitizer panel and is portable. It is possible to prevent the deterioration of the digitizer function by suppressing the transfer of heat generated from the heating part of the terminal to the digitizer panel and shielding the magnetic field generated from the parts of the portable terminal.

As such, in the hybrid sheet for a digitizer according to an embodiment of the present invention, the heat spreader 130 performs a heat dissipation function by dispersing the transferred heat, and the magnetic sheet 100 performs a function of shielding a magnetic field, and magnetic The micro pocket for heat collection of the sheet 100 has the advantage of implementing a multifunctional sheet that can perform both heat dissipation, thermal insulation and magnetic field shielding in one sheet by collecting and insulating the conducted heat. .

Here, the heat spreader 130 preferably includes a thin plate sheet made of a metal or a non-metal having a thermal conductivity of 200 W/mK or more, and the thin plate sheet is any one of a graphite sheet, a Cu sheet, an Al sheet, an Ag sheet, or their It may have a laminated structure. In addition, nickel plating may be performed on the heat spreader 130 of the copper material in order to solve the oxidation and corrosion problems.

And, it is preferable that the plurality of fine pieces of the magnetic sheet 100 have a size of several tens of μm to 3 mm or less. In addition, the magnetic sheet 100 may be used, for example, having a thickness of 5 to 50um per sheet.

In addition, the first double-sided tape 110 uses, for example, an adhesive layer formed on one side of a PET (Polyethylene Terephthalate) film. The thickness of the first double-sided tape 110 is preferably thicker than the thickness of the second double-sided tape 120 . That is, the first double-sided tape 110 is required to secure a predetermined thickness for the purpose of protecting the magnetic sheet 100, but the second double-sided tape 120 satisfies only the adhesive function of the magnetic sheet 100 and the heat spreader 130 Therefore, the thickness of the second double-sided tape 120 is formed to be thinner than the thickness of the first double-sided tape 110 .

As such, the hybrid sheet for a digitizer of the present invention can be implemented as an ultra-thin sheet having a thickness of several tens of μm, and can perform both heat dissipation, thermal insulation and magnetic field shielding functions with a single sheet.

Meanwhile, the first double-sided tape 110 may have a thickness of 10 μm to 30 μm, and the second double-sided tape 120 may use a thickness of 1 μm to 20 μm.

In the hybrid sheet for a digitizer of the present invention, when the adhesive layer of the first double-sided tape 110 is exposed to the outside, handling properties such as transport and storage may be reduced due to the adhesive component of the adhesive layer, so a release film is applied to the adhesive layer. Adhere.

That is, the release film is adhered to the adhesive layer before the hybrid sheet for digitizer is attached to the hybrid sheet for digitizer to protect the adhesive layer, and after separating the release film, the hybrid sheet for digitizer is attached to the back of the digitizer panel. will be.

As the release film, a resin material such as a PET film may be used, and a fiber material may be applied in addition to the resin material.

Referring to Figure 2, the hybrid sheet for a digitizer is, as described below, when the ribbon of an amorphous alloy or nanocrystalline alloy is subjected to heat treatment and flake process, the ribbon is separated into a plurality of fine pieces 101, and cracks in the ribbon ( The magnetic sheet 100 on which 103 is formed is obtained. At this time, since the plurality of fine fragments 101 are separated, a microcavity 102 is formed between the fine fragments 101 . In addition, the microcavity 105 may be sometimes formed in the crack 103 region. The microcavity 105 formed in the microcavity 102 and the crack 103 between the micro-pieces 101 is a first double-sided tape 110 adhered to the upper and lower surfaces of the magnetic sheet 100 and By the second double-sided tape 120, it becomes a trapped pore, and becomes a micro-pocket capable of collecting the transferred heat.

The above-described magnetic sheet 100 may use a ribbon of a thin plate made of an amorphous alloy or a nanocrystalline alloy. The amorphous alloy may use a Fe-based or Co-based magnetic alloy, it is preferable to use a Fe-based magnetic alloy in consideration of material cost.

Fe-based magnetic alloy, for example, may use a Fe-Si-B alloy, Fe is preferably 70-90atomic%, the sum of Si and B is 10-30atomic%. The higher the content of metals including Fe, the higher the saturation magnetic flux density. However, when the content of the Fe element is excessive, it is difficult to form amorphous. In the present invention, it is preferable that the content of Fe is 70-90 atomic%. In addition, when the sum of Si and B is in the range of 10-30 atomic%, the amorphous forming ability of the alloy is the best. In order to prevent corrosion in this basic composition, corrosion-resistant elements such as Cr and Co may be added within 20 atomic%, and other metal elements may be included in small amounts as needed to impart other characteristics.

The Fe-Si-B alloy may have, for example, a crystallization temperature of 508°C and a Curie temperature (Tc) of 399°C. However, the crystallization temperature may vary depending on the content of Si and B or other metal elements added in addition to the ternary alloy component or the content thereof. In the present invention, as the Fe-based amorphous alloy, if necessary, a Fe-Si-B-Co alloy may be used.

On the other hand, the magnetic sheet 100 may use a ribbon of a thin plate made of a Fe-based nano-crystalline magnetic alloy, the Fe-based nano-crystalline magnetic alloy, it is preferable to use an alloy satisfying the following equation (1).

In Equation 1, A is at least one element selected from Cu and Au, D is Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Ni, Co and rare earth elements selected from At least one element, E represents at least one element selected from Mn, Al, Ga, Ge, In, Sn and platinum group elements, Z represents at least one element selected from C, N and P; , c, d, e, f, g and h are the relations 0.01≤c≤8at%, 0.01≤d≤10at%, 0≤e≤10at%, 10≤f≤25at%, 3≤g≤12at%, 15 ≤f+g+h≤35at%, respectively, and 20% or more as an area ratio of the alloy structure consists of a microstructure with a particle diameter of 50 nm or less.

In Equation 1, element A is used to improve corrosion resistance of the alloy, to prevent coarsening of crystal grains, and to improve magnetic properties such as iron loss and permeability of the alloy. When there is too little content of A element, it will be difficult to acquire the coarsening suppression effect of a crystal grain. Conversely, when the content of element A is too large, the magnetic properties deteriorate. Accordingly, the content of element A is preferably in the range of 0.01 to 8 at%. Element D is an element effective for uniform crystal grain diameter, reduction of magnetostriction, and the like. The content of element D is preferably in the range of 0.01 to 10 at%.

E element is an effective element for improving soft magnetic properties and corrosion resistance of the alloy. The content of element E is preferably 10 at% or less. Si and B are elements that form amorphous-ization of the alloy at the time of manufacturing the magnetic sheet. The content of Si is preferably in the range of 10 to 25 at%, and the content of B is preferably in the range of 3 to 12 at%. Moreover, the Z element may be included in the alloy as an amorphous composition element of alloys other than Si and B. In that case, the total content of Si, B and Z elements is preferably in the range of 15 to 35 at%. The microcrystal structure is preferably formed to implement 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.

In addition, the Fe-based nano-crystal grain magnetic alloy used in the magnetic sheet 100 may use a Fe-Si-B-Cu-Nb alloy, in this case, Fe is 73-80 at%, the sum of Si and B 15-26 at%, the sum of Cu and Nb is preferably 1-5 at%. An amorphous alloy manufactured in the form of a ribbon having such a composition range may be easily precipitated as nano-phase crystal grains by heat treatment to be described later.

The thin magnetic sheet applied to the present invention as described above preferably has a magnetic permeability of 100 to 200 uH/m, a specific resistance of 150 uΩ·cm or more, and a thickness of 5 to 50 μm at a frequency of 100 to 560 KHz, and the thickness of the thin magnetic sheet is preferably 25 to 27 μm. .

3 is a cross-sectional view illustrating a state in which a comparative example of the hybrid sheet of the present invention is adhered to a digitizer panel, and FIG. 4 is a cross-sectional view illustrating a state in which the hybrid sheet of the present invention is adhered to the digitizer panel.

3 and 4, a comparative example of the hybrid sheet of the present invention is between the heat spreader 10 and the first magnetic sheet 30, double-sided tape 23 / graphite 22 / double-sided tape 21 It is a sheet of a structure in which a laminated structure and a second magnetic sheet 25 are interposed, and a double-sided tape 50 is adhered to the upper surface of the first magnetic sheet 30 .

And, as described above, in the hybrid sheet of the present invention, the first double-sided tape 110 is adhered to the upper portion of the magnetic sheet 100 , and the second double-sided tape 120 is adhered to the lower portion of the magnetic sheet 100 . and has a structure in which the heat spreader 130 is adhered to the lower portion of the second double-sided tape 120 .

The hybrid sheet of the present invention and the sheet of the comparative example are adhered to the digitizer panel 1000 of the portable terminal to suppress the transfer of heat generated from an application processor chip (AP) inside the portable terminal to the digitizer panel 1000 . Thus, the temperature of the heat transferred through the digitizer panel 1000 of the portable terminal may be maintained below the specified temperature.

Here, the digitizer panel 1000 is mounted on a portable terminal such as a smartphone, and enables an electronic pen function that allows a user to input numbers or text by touching the screen using an input tool such as an electronic pen. .

Therefore, the hybrid sheet of the present invention and the sheet of the comparative example are adhered to the digitizer panel 1000 of the portable terminal, and heat generated from a hot spot heating component such as an AP chip of the portable terminal is transferred to the digitizer panel 1000 function to prevent it from happening.

The sheet of the comparative example has a double-sided tape 23/graphite 22/double-sided tape 21 stacked structure and a band-shaped second magnetic sheet 25 between the Cu layer 10 and the first magnetic sheet 30 . Since it is interposed, it is relatively thicker than the hybrid sheet of the present invention, and it is impossible to apply the roll-to-roll method to mass production process, so assembly productivity is low, and manufacturing cost is increased due to expensive materials such as graphite 22 do.

In other words, the hybrid sheet of the present invention has a simpler structure than the sheet of the comparative example and can be manufactured to be ultra-thin, so it is easy to be embedded in a portable terminal that is becoming high-performance and lightweight, and it can simplify the manufacturing process and reduce the manufacturing cost. There are significant advantages to

At this time, looking at the structural features of the hybrid sheet of the present invention and the sheet of the comparative example, first, the first magnetic sheet 30 of the sheet of the comparative example applies a polymer sheet having a low magnetic permeability of 90 to 150 uH / m, and various parts of the terminal body. It shields the magnetic field generated by

Therefore, the sheet of the comparative example can shield the magnetic field generated in the portable terminal by the first magnetic sheet 30 alone, but cannot block the digitizer from being affected by the magnesium frame disposed on the side, so that the magnetic permeability is the first The second magnetic sheet 25 , which is relatively higher than the magnetic sheet 30 , is interposed between the Cu layer 10 and the first magnetic sheet 30 .

The magnetic sheet 100 applied to the hybrid sheet of the present invention is separated and/or cracked into a plurality of fine pieces by heat-treating the ribbon of an amorphous alloy or nanocrystalline alloy and then flake-treated, and micro pockets for heat collection are formed. It is composed of more than one layer, and it has a magnetic permeability in the range of 80~600uH/m, so it has a shielding ability to shield not only the magnetic field transmitted inside the portable terminal but also the influence of the magnesium frame.

That is, the hybrid sheet of the present invention is adhered to the digitizer panel 1000 to prevent the digitizer function from being affected by magnetic fields generated from various parts built in the portable terminal body.

In addition, the hybrid sheet of the present invention can shield the magnetic field transmitted from the magnesium frame for reinforcing the strength of the portable terminal and supporting various parts by the magnetic sheet 100 having high magnetic permeability, such as the sheet of the comparative example. There is no need to provide a separate second magnetic sheet 25 .

And, looking at the function of suppressing the transfer of heat generated from the heat generating part of the portable terminal to the digitizer panel 1000, the sheet of the comparative example embeds expensive graphite 22 and Cu layer 10 in the heat generating part. The generated heat is diffused to dissipate heat, but the hybrid sheet of the present invention dissipates heat generated from the heat generating part in the heat spreader 130 and then insulates it in the micro pockets for heat collection of the magnetic sheet 100 to suppress heat transfer do.

Here, the magnetic sheet 100 of the hybrid sheet of the present invention is provided with micro pockets for heat collection, and since the first and second double-sided tapes 110 and 120 are adhered to both sides of the magnetic sheet 100, this heat collection Air trapped in the micro-pockets becomes an air pocket. Since this air pocket is trapped (contained) without convection of air, it can exhibit excellent thermal insulation properties of air itself.

That is, the sheet of the comparative example is generated from the AP chip mounted on the main board of the portable terminal by the expensive graphite 22 and the Cu layer 10 interposed between the Cu layer 10 and the first magnetic sheet 30 . The heat transferred to the digitizer panel 1000 is suppressed by diffusing and dissipating the heat in two stages.

On the other hand, the hybrid sheet of the present invention has a magnetic sheet 100 , a first double-sided tape 110 adhered to the upper portion of the magnetic sheet 100 , and a second double-sided tape 120 adhered to the lower portion of the magnetic sheet 100 . , and a heat spreader 130 attached to the lower portion of the second double-sided tape 120, so that the heat generated from the AP chip of the portable terminal is radiated from the heat spreader 130, and the magnetic sheet ( 100), by insulating in the micro pocket for heat collection, suppresses the heat transferred to the digitizer panel (1000).

Therefore, the sheet of the comparative example has only a heat dissipation function by the graphite 22 and the Cu layer 10, but the hybrid sheet of the present invention has a heat dissipation function by the heat spreader 130 and a micro pocket of the magnetic sheet 100. It has a thermal insulation function.

The sheet of the comparative example and the hybrid sheet of the present invention were manufactured under the conditions shown in Table 1, and heat dissipation properties were tested.

layer material sheet of comparative example first sheet of the present invention Second sheet of the present invention One Double-sided tape 35㎛ 35㎛ 35㎛ 2 magnetic sheet 50㎛ 27㎛ 27㎛ 3 Double-sided tape 15㎛
Magnetic sheet 55㎛ 3㎛ 3㎛ 4 graphite 25㎛ - - 5 Double-sided tape 15㎛ - - 6 Cu 35㎛ 100㎛ 50㎛ overall thickness 175㎛ 165㎛ 115㎛

Referring to Table 1, in the prepared comparative example sheet and the first and second sheets of the present invention, the magnetic sheet in the second layer of the comparative example sheet is a polymer sheet, and the magnetic sheet located in the third to fifth layers is a polymer The magnetic sheet applied to the second layer of the first and second sheets of the present invention having a higher magnetic permeability than the sheet was disposed.

And, the sheet of Comparative Example has a total thickness of 175 µm, the total thickness of the first sheet of the present invention is 165 µm, and the total thickness of the second sheet of the present invention is designed to be 115 µm, and the first and second sheets of the present invention are designed to have a total thickness of 115 µm. The total thickness of the 2 sheets was made thinner than the sheet of the comparative example.

In this case, the comparative example sheet has a six-layer structure, but since the first and second sheets of the present invention have a four-layer structure, the overall thickness can be relatively thin.

In addition, in the case of a magnetic sheet disposed on the second layer, a polymer sheet should be applied to the sheet of the comparative example and set to a thickness of 50 μm due to low magnetic permeability, but in the first and second sheets of the present invention, the magnetic permeability is high and for heat collection Since the magnetic sheet has a characteristic in which micro pockets are formed, the magnetic field shielding ability does not deteriorate even if it is set to a relatively thin thickness of about 27 μm compared to the polymer sheet applied to the sheet of Comparative Example.

As such, in the first and second sheets of the present invention, it is possible to reduce the thickness of the two-layer magnetic sheet, and since the fourth and fifth layers of the sheet of the comparative example are not required, the entire thickness can be configured to be thin, In addition, even if the Cu layer is applied as 100 μm, which is relatively thicker than the thickness of the Cu layer 35 μm of the sheet of Comparative Example due to the thin thickness of the first to third layers, the total thickness of the first and second sheets of the present invention is the sheet of Comparative Example thinner than the full thickness of

thickness
(μm)
Temperature (℃)
Size (mm)

Outside temperature (℃)
10 min/25 min/30 min Front back side 10 minutes 25 minutes 30 minutes 10 minutes 25 minutes 30 minutes comparative example 175 35.6 38.0 38.2 33.3 36.3 36.3

46 X 51.3 25.1/25.2/25.2 1st sheet 165 34.7
(-0.9) 37.6
(-0.4) 38.0
(-0.2) 32.5
(-0.8) 36.0
(-0.3) 36.0
(-0.3) 25.2/25.2/25.2 2nd sheet 115 35.0
(-0.6) 37.8
(-0.2) 38.0
(-0.2) 32.7
(-0.6) 36.0
(-0.3) 36.0
(-0.3) 25.1/25.2/25.2

Therefore, the first and second sheets of the present invention and the sheets of the comparative example were prepared under the conditions shown in Table 1, and then adhered to the digitizer panel of the portable terminal, and after a time elapses in a call state of the portable terminal, the front surface of the portable terminal And as a result of measuring the temperature of the rear surface, as shown in Table 2, it can be seen that the first and second sheets of the present invention exhibited excellent heat dissipation characteristics lower by about 0.2 to 0.9°C than the sheets of the comparative example, and It can be seen that the heat transfer suppression ability of the

5 is a conceptual cross-sectional view for explaining a structure of a double-sided tape applied to a hybrid sheet for a digitizer according to an embodiment of the present invention, and FIG. 6 is a laminated structure of a hybrid sheet for a digitizer according to an embodiment of the present invention It is a conceptual cross-section for

As shown in FIG. 5 , the second double-sided tape 120 has adhesive layers 120b and 120c formed on both sides of a base material 120a made of a fluororesin-based film, such as a polyethylene terephthalate (PET) film.

For the adhesive layers 120b and 120c, for example, an acrylic adhesive may be used, and of course, other types of adhesive may be used. In addition, the release film is formed integrally by being adhered to the adhesive layers 120b and 120c during the manufacture of the double-sided tape, and is peeled off and removed when the hybrid sheet for a digitizer according to the present invention is attached to an electronic device.

Referring to FIG. 6 , the hybrid sheet for a digitizer according to an embodiment of the present invention may include a plurality of magnetic sheets. In this case, the double-sided tapes 120A1, 120A2, and 120A3 adhered to the lower portions of the magnetic sheets 100A1, 100A2, 100A3 are repeatedly laminated on the heat spreader 130 and implemented. That is, a first set consisting of a magnetic sheet 100A1 and a double-sided tape 120A1 is laminated on the heat spreader 130, and a magnetic sheet 100A2 and a double-sided tape 120A2 are laminated on the first set of magnetic sheets 100A1. The second set is laminated, and a third set made of the magnetic sheet 100A3 and the double-sided tape 120A3 is laminated on the second set of magnetic sheets 100A2. As such, when the hybrid sheet for a digitizer includes a plurality of magnetic sheets 100A1 , 100A2 , and 100A3 , the heat collection ability is increased to improve the thermal insulation function, and the magnetic field shielding function can be further improved.

7 is a flowchart of a method of manufacturing a hybrid sheet for a digitizer according to an embodiment of the present invention.

In the method of manufacturing a hybrid sheet for a digitizer according to an embodiment of the present invention, first, a ribbon made of an amorphous alloy is prepared by a rapid cooling and solidification method (RSP) by melt spinning (S100). At this time, in order to facilitate post-processing after heat treatment, it is first cut to a predetermined length and laminated in a sheet form.

For example, an ultra-thin Fe-based amorphous ribbon of 30 μm or less made of Fe-Si-B or Fe-Si-B-Co alloy is manufactured by rapid solidification (RSP) by melt spinning, and 300 μm or less can be obtained to obtain the desired magnetic permeability. A heat treatment is performed for 30 minutes to 2 hours in a temperature range of ℃ to 600℃ (S110).

In this case, since the heat treatment atmosphere is performed in a temperature range in which oxidation does not occur even if the Fe content of the ribbon is high, it is not necessary to perform the heat treatment in an atmosphere furnace, and the heat treatment may be performed in the air. In addition, even if the heat treatment is performed in an oxidizing atmosphere or a nitrogen atmosphere, there is substantially no difference in the magnetic permeability of the amorphous ribbon under the same temperature conditions.

When the above heat treatment temperature is less than 300 ° C, the magnetic permeability is higher than the desired magnetic permeability and there is a problem that the heat treatment time takes a long time, and when it exceeds 600 ° C, the magnetic permeability is significantly lowered by the overheating treatment There is a problem that the desired magnetic permeability is not shown. . In general, when the heat treatment temperature is low, the treatment time is long, whereas when the heat treatment temperature is high, the treatment time is shortened.

On the other hand, in the case of obtaining a nano-crystalline ribbon sheet, for example, an ultra-thin amorphous ribbon of 30 μm or less having a Fe-Si-B-Cu-Nb composition is prepared by a rapid solidification method (RSP) by melt spinning, and the desired To obtain permeability, the ribbon sheet is subjected to a magnetic field heat treatment at a temperature range of 400° C. to 700° C. for 30 minutes to 2 hours to form a nano crystal grain ribbon sheet having nano crystal grains.

In this case, since the content of Fe in the heat treatment atmosphere is 70at% or more, oxidation is made when heat treatment is performed in the atmosphere, which is not preferable from a visual point of view. Therefore, it is preferable to perform it in a nitrogen atmosphere. However, even if heat treatment is performed in an oxidizing atmosphere, there is substantially no difference in the magnetic permeability of the sheet under the same temperature conditions.

In this case, when the heat treatment temperature is less than 400 ℃, there is a problem that the desired permeability is not obtained because the nanocrystal grains are not sufficiently generated and the heat treatment time is long, and when it exceeds 700 ℃, the magnetic permeability is significantly lowered by overheating there is a problem. When the heat treatment temperature is low, it is preferable that the treatment time is long, and on the contrary, when the heat treatment temperature is high, the treatment time is shortened.

In addition, in the present invention, the thickness of the ribbon is used in the range of 15 ~ 35um, the magnetic permeability of the ribbon increases in proportion to the thickness of the ribbon.

Furthermore, the ribbon becomes brittle when heat treatment is performed, so that flakes can be easily formed when performing flake treatment in a subsequent process.

Next, a first double-sided tape is attached to one side of the heat-treated ribbon, and a second double-sided tape is attached to the other side to flake the release film to form micro pockets for heat collection (S120).

The flake treatment separates the ribbon into a plurality of fine pieces by, for example, passing a laminated sheet in which the first double-sided tape, the ribbon and the second double-sided tape and the release film are sequentially laminated through a flake device. Here, a ribbon may be attached to a lower portion of the first double-sided tape, and a release film or a protective film may be attached to an upper portion of the first double-sided tape.

The usable flake device may include, for example, a metal roller having a plurality of irregularities formed on its outer surface, and a rubber roller disposed to face the metal roller.

In this way, when the laminated sheet is passed through the flake device, the ribbon is separated into a plurality of fine pieces, and microcavities are generated between the fine pieces.

Since many fine pieces of the ribbon are formed to have a size in the range of several tens of um to 3 mm, the uniformity of permeability to the sheet is increased by increasing the anti-magnetic field to remove the hysteresis loss.

On the other hand, when only the flake treatment is performed, the size of the fine fragments increases as the fine fragments come into contact with each other according to the flow of the fine fragments, thereby increasing the eddy current loss.

Moreover, in the flaked laminated sheet, surface unevenness of the sheet may occur during flake treatment, and stabilization of the flaked ribbon is required.

Therefore, a lamination process for planarization, slimming and stabilization of the flake-treated laminated sheet is performed (S130). At this time, by performing lamination under process conditions that can prevent the adhesive from penetrating into the microcavity, it is preferable to make the magnetic sheet have micro pockets for heat collection.

Here, it is possible to prevent the adhesive from penetrating into the microcavity according to the properties of the adhesive and the laminating process conditions, and sometimes the adhesive may penetrate into some areas of the microcavity present in the laminated sheet flaked by the laminating process.

Finally, the release film is removed, and the heat spread is adhered to the second double-sided tape from which the release film is removed (S140).

8 is an exploded perspective view of a portable terminal according to an embodiment of the present invention.

8, the portable terminal according to an embodiment of the present invention includes a main PCB (not shown) disposed in the inner space of the cases 1100 and 1110 and on which various circuit components are mounted; A display panel 1120 for visually displaying information, a digitizer panel 1130 for performing an electronic pen function, and a hybrid sheet for a digitizer disposed on the rear side of the digitizer panel 1130 and mounted inside the cases 1100 and 1110 1300 and a frame 1150 for fixing various parts mounted inside the cases 1100 and 1110 and reinforcing the strength of the case.

The cases 1100 and 1110 include a front case 1100 having a transparent window 1102 and a rear case 1110 coupled to the front case 100 and serving as a battery cover.

The display panel 1120 may be provided as a touch screen for inputting information by a user's touch.

Since such a portable terminal is portable, it should be light in weight and strong in strength. For this purpose, the frame 1150 is a lightweight and strong magnesium frame is used.

The hybrid sheet for a digitizer of the present invention may be mounted on an electronic device including the aforementioned portable terminal. This electronic device is equipped with a digitizer panel to perform an electronic pen function.

These electronic devices include all portable electronic devices such as mobile phones, smart phones, notebook computers, digital broadcasting terminals, personal digital assistants (PDA), portable multimedia players (PMPs), navigation devices, and TVs and refrigerators. It includes large electronic devices including heat-generating parts, such as

In the above, the present invention has been illustrated and described with examples of specific preferred embodiments, but the present invention is not limited to the above-described embodiments, and within the scope of not departing from the spirit of the present invention, common knowledge in the technical field to which the present invention belongs Various changes and modifications will be possible by those who have

10: Cu layer 13: crack
21,23,50,110,120,120A1,120A2,120A3: double-sided tape
25,30,100,100A1,100A2,100A2: magnetic sheet
101: fine engraving
102,105: microcavity 120b, 120c: adhesive layer
130: heat spreader 200: terminal body
210: rear cover 250: display unit
260: outer case 300: hybrid seat for digitizer
1000: digitizer panel

Claims (11)

A hybrid sheet that is laminated on a digitizer panel of an electronic device to simultaneously perform magnetic field shielding, thermal insulation and heat dissipation functions,
A thin magnetic sheet including fine air pockets for heat collection so as to shield the magnetic field and suppress heat transfer in the vertical direction;
a first adhesive member stacked on top of the thin magnetic sheet;
a second adhesive member stacked under the thin magnetic sheet; and
and a heat spreader that is adhered to the thin magnetic sheet by the second adhesive member and spreads the locally generated heat in the horizontal direction to dissipate the heat;
The thin magnetic sheet includes a plurality of fine fragments and/or cracks formed separately by flake treatment of a Fe-based amorphous alloy, a Co-based amorphous alloy, or a nano-grain alloy ribbon,
The hybrid sheet, characterized in that the fine air pockets are microcavities formed between the minute pieces or in cracks. delete According to claim 1,
The thin magnetic sheet is a hybrid sheet having a magnetic permeability of 100 to 200uH/m, a specific resistance of 150uΩ·cm or more, and a thickness of 5 to 50um at a frequency of 100 to 560KHz. 4. The method of claim 3,
The thickness of the thin magnetic sheet is a hybrid sheet of 25 ~ 27um. The method of claim 1
A hybrid sheet in which a plurality of the thin magnetic sheets are stacked. According to claim 1,
The first and second adhesive members are double-sided tapes, and the thickness of the first adhesive member is thicker than that of the second adhesive member. According to claim 1,
The heat spreader is a hybrid sheet comprising a thin plate sheet made of a metal or non-metal with a thermal conductivity of 200 W / mK or more. 8. The method of claim 7,
The thin sheet is any one of a graphite sheet, a Cu sheet, an Al sheet, an Ag sheet, or a hybrid sheet having a laminate structure thereof. Heating the Fe-based amorphous alloy, Co-based amorphous alloy or nano-grain alloy ribbon;
A first double-sided tape is attached to one side of the heat-treated ribbon, and a second double-sided tape is attached to the other side to form a laminated sheet, and then flakes the laminated sheet to suppress heat transfer in the vertical direction. forming fine air pockets for and
Adhering a heat spread to the second double-sided tape; Method of manufacturing a hybrid sheet comprising a. delete case;
a display panel disposed on the front side of the case;
a digitizer panel disposed on a rear surface of the display panel; and
An electronic device comprising a; the hybrid sheet according to any one of claims 1, 3 to 8, which is adhered to the rear surface of the digitizer panel.

Images