KR20160013602A - 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 manufacturing method thereof, and an electronic apparatus comprising the same. The hybrid sheet simultaneously performing electromagnetic field blocking, insulating, and heat radiating functions by being stacked on a digitizer panel of the electronic apparatus comprises an amorphous magnetic sheet blocking an electro magnetic field, and controlling vertical heat transfer; a first adhesive member laminated on the upper part of the amorphous magnetic sheet; a second adhesive member laminated on the lower part of the amorphous magnetic sheet; and a heat spreader attached to the amorphous magnetic sheet by the second adhesive member, and horizontally diffusing locally generated heat, and radiating the same.

Description

Technical Field [0001] The present invention relates to a hybrid sheet for a digitizer, a method of manufacturing the same, and an electronic apparatus having the same.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hybrid sheet for a digitizer, and more particularly, to a hybrid sheet for a digitizer capable of an ultra-thin structure and capable of suppressing heat transmitted to a digitizer panel and shielding a magnetic field, And an electronic apparatus 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 users, miniaturization and weight reduction are indispensable for a portable terminal, and components integrated in smaller and smaller spaces are mounted for high performance. Accordingly, the parts used in the portable terminal have higher performance and higher 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, various researches and technologies have been developed for insulation since an optimal heat insulating material having a thin thickness and excellent heat insulating performance has not been developed.

Korean Patent Publication 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, and 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 an insulating film has no function other than the heat shielding function.

For example, in order to prevent the above-described electronic apparatuses, particularly electronic apparatuses having a digitizer function, from being transmitted to the user through distortion of letters due to electromagnetic fields and electromagnetic fields of LCDs, a separate electromagnetic shielding sheet is applied.

Accordingly, the inventors of the present invention invented the structural characteristics of the seat capable of simultaneously performing the heat insulation, the heat insulation and the electromagnetic shielding function by continuously studying the technology capable of blocking heat and electromagnetic fields generated in the portable terminal, And has completed the present invention which is more economical, utilizable and competitive.

Korean Patent Registration No. 10-1134880

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a hybrid sheet for a digitizer capable of suppressing heat transmitted to a digitizer panel and shielding a magnetic field to prevent deterioration of the function of the digitizer, And to provide an electronic apparatus.

Another object of the present invention is to provide a hybrid sheet for a digitizer capable of performing heat radiation, heat insulation and magnetic shielding functions in a single sheet, a method of manufacturing the same, and an electronic apparatus 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 laminated on a digitizer panel of an electronic device to simultaneously perform electromagnetic shielding, heat insulation, and heat radiation functions, An amorphous magnetic sheet for suppressing heat transfer in a vertical direction; A first adhesive member laminated on the amorphous magnetic sheet; A second adhesive member laminated on the lower portion of the amorphous magnetic sheet; And a heat spreader which is adhered to the amorphous magnetic sheet by the second adhesive member and diffuses heat locally generated in the horizontal direction to dissipate heat.

Here, the amorphous magnetic sheet may include a plurality of micro-pieces and / or cracks separated and formed by heat treatment of an Fe-based amorphous alloy, a Co-based amorphous alloy, or a nanocrystalline alloy ribbon after flaking.

The amorphous magnetic sheet may have a permeability of 100 to 200 at a frequency of 100 to 560 KHz, a resistivity of 150 Ω · cm or more, and a thickness of 5 to 50 μm, and the thickness of the amorphous magnetic sheet may preferably be 25 to 27 μm .

Further, the present invention can be constituted by stacking a plurality of amorphous magnetic sheets.

Further, the first and second adhesive members may be double-sided tape, and the thickness of the first adhesive member may be thicker than the thickness of the second adhesive member.

The heat spreader may include a thin plate sheet made of a metal or a non-metal having a thermal conductivity of 200 W / mK or more. The thin sheet may be any one of a graphite sheet, a Cu thin film, an Al thin film and an Ag thin film, Can be used.

 According to another aspect of the present invention, there is provided a method of manufacturing a hybrid sheet for a digitizer, the method comprising: heat treating a ribbon made of an amorphous alloy or a nanocrystalline 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, and then flaking the ribbon; And bonding a heat spray to the second double-sided tape.

Further, the present invention may further include a step of laminating the flaked laminated sheet after the flake processing step.

An electronic device for achieving the object of the present invention includes: a case; A display panel disposed on a front surface 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 back surface of the digitizer panel.

As described above, according to the present invention, it is possible to manufacture an ultra-thin type, simplify the manufacturing process, reduce the manufacturing cost, suppress heat transmitted to the digitizer panel, and shield the magnetic field, thereby preventing the digitizer function from deteriorating.

In the present invention, it is possible to realize a multi-function ultra-thin sheet capable of performing both heat dissipation, thermal insulation and magnetic shielding in one sheet, and it is possible to reduce the manufacturing cost without applying the individual sheet for heat dissipation, There is an advantage.

In the present invention, a micro-space between a plurality of micro-pieces formed on a magnetic sheet by flake treatment and a micro-space existing in a crack function as a micro-pocket for heat-trapping and collect heat transferred, .

1 is a conceptual sectional view for explaining a hybrid sheet for a digitizer according to an embodiment of the present invention,
2 is a conceptual sectional view for explaining a state in which micro pores 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 bonded 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 a digitizer panel,
5 is a conceptual cross-sectional view illustrating a structure of a double-sided tape applied to a hybrid sheet for a digitizer according to an embodiment of the present invention,
FIG. 6 is a conceptual cross-sectional view illustrating a lamination 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.

FIG. 1 is a conceptual sectional view for explaining a hybrid sheet for a digitizer according to an embodiment of the present invention. FIG. 2 illustrates a state in which fine pores are formed in a magnetic sheet of a hybrid sheet for a digitizer according to an embodiment of the present invention Fig.

1, a hybrid sheet for a digitizer according to an embodiment of the present invention includes a ribbon of an amorphous alloy or a nano-crystal alloy, which is heat treated and flaked to be separated and / or divided into a plurality of fine pieces (not shown) At least one or more magnetic sheets 100 having cracks formed therein and having heat collecting fine pockets formed thereon, a first double-sided tape 110 bonded to the upper portion of the magnetic sheet 100, A second double-sided tape 120 adhered to a lower portion of the second double-sided tape 120, and a heat spreader 130 bonded 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 surface of the first double-sided tape 110 is bonded to the magnetic sheet 100, the other surface of the first double-sided tape 110 is bonded to the digitizer panel, It is possible to prevent the heat generated from the heat generating component of the terminal from being transmitted to the digitizer panel and to prevent the degradation of the digitizer function by shielding the magnetic field generated in the component of the portable terminal.

In the hybrid sheet for a digitizer according to an embodiment of the present invention, the heat spreader 130 disperses the heat transferred thereto to perform a heat radiating function, and the magnetic sheet 100 functions to shield a magnetic field, The fine pockets for heat collection of the sheet 100 have an advantage that a multi-functional sheet capable of performing both heat dissipation, thermal insulation, and magnetic field shielding in one sheet can be realized by performing the function of collecting and insulating the conducted heat .

Preferably, the heat spreader 130 includes a thin sheet made of a metal or a non-metal having a thermal conductivity of 200 W / mK or more. The thin sheet may be any one of a graphite sheet, a Cu thin film, an Al thin film, and an Ag thin film, May be a laminated structure. Nickel plating can be performed on the heat spreader 130 of the copper material to solve oxidation and corrosion problems.

It is preferable that the majority of the fine pieces of the magnetic sheet 100 have a size of several tens um to 3 mm or less. The magnetic sheet 100 may have a thickness of, for example, 5 to 50 mu m per sheet.

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.

As described above, the hybrid sheet for a digitizer of the present invention can be realized as an ultra-thin sheet having a thickness of several tens of um and can perform both heat radiation, heat insulation and magnetic shielding functions with a single sheet.

On the other hand, 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 20 um.

When the adhesive layer of the first double-sided tape 110 is exposed to the outside, the hybrid sheet for a digitizer of the present invention may have poor handleability such as transportation and storage due to the adhesive component of the adhesive layer, Bond the film.

That is, the release film functions to protect the adhesive layer by adhering to the adhesive layer before the digitizer hybrid sheet is attached to the digitizer hybrid sheet, separating the release film, and then bonding the digitizer hybrid sheet to the back of the digitizer panel will be.

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

2, when a ribbon of an amorphous alloy or a nanocrystalline alloy is subjected to a heat treatment and a flaking process, a ribbon is separated into a plurality of minute pieces 101 and a crack 103 are formed on the magnetic sheet 100. At this time, since the plurality of minute pieces 101 are separated from each other, a minute space 102 is formed between the minute pieces 101. [ In addition, the fine space 105 can be formed in the crack 103 region. The micro-space 102 and the micro-space 105 formed in the crack 103 between the micro-pieces 101 may include a first double-sided tape 110 bonded to the upper and lower surfaces of the magnetic sheet 100, By the second double-sided tape 120, the micro pores become trapped micro pores and become the micro pockets capable of collecting the transmitted heat.

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.

On the other hand, the magnetic sheet 100 may be a thin plate ribbon made of an Fe-based nano-crystal magnetic alloy, and the Fe-based nano-crystal magnetic alloy preferably uses an alloy satisfying the following formula (1).

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

In the above formula (1), the element A is used for enhancing the corrosion resistance of the alloy, preventing coarsening of crystal grains, and improving magnetic properties such as iron loss and magnetic permeability of the alloy. If the content of the element A is too small, it is difficult to obtain a coarsening inhibiting effect of the crystal grains. On the other hand, if the content of element A is too large, the magnetic properties are deteriorated. Therefore, the content of the element A is preferably in the range of 0.01 to 8 at%. The D element is an element effective for homogenizing crystal grain diameters and reducing magnetostriction. The content of the D element is preferably in the range of 0.01 to 10 at%.

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

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.

The amorphous magnetic sheet according to the present invention preferably has a permeability of 100 to 200 at a frequency of 100 to 560 KHz, a specific resistance of 150 Ω · cm or more, and a thickness of 5 to 50 μm, and a thickness of the amorphous magnetic sheet is preferably 25 to 27 μm.

FIG. 3 is a sectional view showing 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 sectional view showing a state in which a hybrid sheet of the present invention is adhered to a digitizer panel.

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

In the hybrid sheet of the present invention, as described above, the first double-sided tape 110 is bonded 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 a heat spreader 130 is adhered to a lower portion of the second double-sided tape 120. [

The hybrid sheet of the present invention and the sheet of the comparative example are bonded to the digitizer panel 1000 of the portable terminal to inhibit the heat generated in the AP chip (application processor chip) inside the portable terminal from being transmitted to the digitizer panel 1000 So that the temperature of the heat transmitted through the digitizer panel 1000 of the portable terminal can be kept below the specified temperature.

Here, the digitizer panel 1000 is mounted on a portable terminal such as a smart phone, and enables an electronic pen function that enables a user to input numbers, text, etc. 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 bonded to the digitizer panel 1000 of the portable terminal, and the heat generated from the hot spot heat generating component such as the AP chip of the portable terminal is transmitted to the digitizer panel 1000 And the like.

The sheet of the comparative example has a laminated structure of a double-faced tape 23 / graphite 22 / double-faced tape 21 and a strip-shaped second magnetic sheet 25 between the Cu layer 10 and the first magnetic sheet 30 It is impossible to apply the mass-production process in the roll-to-roll system and thus the assembly productivity is low, and the production cost is increased due to the expensive material such as the graphite 22 do.

In other words, the hybrid sheet of the present invention can be manufactured to be ultra-thin and simple in structure compared to the seat of the comparative example, so that it is easy to embed in a portable terminal which is high performance and light and thin, and can simplify the manufacturing process and reduce the manufacturing cost There is a remarkable advantage.

The first magnetic sheet 30 of the comparative example sheet was produced from various parts of the terminal main body by applying a polymer sheet having a low magnetic permeability of 90 to 150, Shielding the magnetic field.

Therefore, the sheet of the comparative example can shield the magnetic field generated in the portable terminal by the single structure of the first magnetic sheet 30, but can not prevent the digitizer from being affected by the magnesium frame disposed on the side, It is inevitable that the second magnetic sheet 25 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 characterized in that the amorphous alloy or the nanocrystalline alloy ribbon is heat treated and flaked to separate and / or crack into a plurality of fine pieces and a fine pockets for heat collection are formed And has a magnetic permeability in the range of 80 to 600, so that it can shield not only the magnetic field transmitted from the portable terminal but also the magnesium frame even in a single configuration.

That is, the hybrid sheet of the present invention can be prevented from adversely affecting the digitizer function due to the magnetic field generated from various parts incorporated in the portable terminal body by being bonded to the digitizer panel 1000.

In addition, since 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 components by the magnetic sheet 100 having a high magnetic permeability, It is not necessary to provide a separate second magnetic sheet 25.

The function of suppressing the heat generated in the heat generating component of the portable terminal from being transmitted to the digitizer panel 1000 is as follows. The sheet of the comparative example has the built-in high-priced graphite 22 and the Cu layer 10, The hybrid sheet of the present invention dissipates the generated heat to dissipate heat. The heat generated from the heat generating component is dissipated in the heat spreader 130, and then the heat is transferred to the heat absorbing fine pockets of the magnetic sheet 100, do.

Here, the magnetic sheet 100 of the hybrid sheet of the present invention has fine pockets for heat collection. Since the first and second double-sided tapes 110 and 120 are bonded to both surfaces of the magnetic sheet 100, The air trapped in the micro pocket is used as an air pocket. This air pocket can not exhibit convection and is trapped (trapped) so that it can exhibit excellent thermal insulation characteristics of the air itself.

That is, the sheet of the comparative example is generated in 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 transmitted to the digitizer panel 1000 is suppressed.

On the other hand, the hybrid sheet of the present invention includes a magnetic sheet 100, a first double-sided tape 110 bonded to the top of the magnetic sheet 100, a second double-sided tape 120 bonded to the bottom of the magnetic sheet 100, And the heat spreader 130 bonded to the lower portion of the second double-sided tape 120. Heat generated in the AP chip of the portable terminal is dissipated in the heat spreader 130, 100, thereby suppressing the heat transmitted to the digitizer panel (1000).

Therefore, although the comparative sheet has only a heat radiating function by the graphite 22 and the Cu layer 10, the hybrid sheet of the present invention is superior in heat radiation function by the heat spreader 130 and fine pockets of the magnetic sheet 100 It has insulation function.

The sheet of the comparative example and the hybrid sheet of the present invention were produced under the same conditions as in Table 1, and the heat radiation characteristics were tested.

layer material Comparative Example Sheet The first sheet of the present invention The second sheet One Double-sided tape 35 탆 35 탆 35 탆 2 Magnetic sheet 50 탆 27 탆 27 탆 3 Double-sided tape 15 탆
Magnetic sheet 55 m 3 탆 3 탆 4 Graphite 25 m - - 5 Double-sided tape 15 탆 - - 6 Cu 35 탆 100 탆 50 탆 Overall Thickness 175 탆 165 탆 115 탆

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

The total thickness of the first sheet of the present invention was 165 탆 and the total thickness of the second sheet of the present invention was designed to be 115 탆. The total thickness of the two sheets was made thinner than that of the comparative sheet.

At this time, the sheet of the comparative example has a six-layer structure, but since the first and second sheets of the present invention have a four-layer structure, the total thickness can be relatively reduced.

In the case of the magnetic sheet disposed on the two layers, the comparative sheet should be set to have a thickness of 50 mu m by applying a polymer sheet with a low permeability. In the first and second sheets of the present invention, The magnetic sheet shielding ability is not deteriorated even if the thickness is set to a relatively small thickness of about 27 mu m as compared with the polymer sheet applied to the comparative sheet because it is a magnetic sheet having a feature in which fine pockets are formed.

As described above, the first and second sheets of the present invention can reduce the thickness of the two-layered magnetic sheet, and the fourth and fifth layers of the sheet of the comparative example are not required, Even if the Cu layer is applied to the Cu layer of comparative example at a thickness of 100 mu m which is relatively thicker than the thickness of 35 mu m by the thin thickness of 1 to 3 layers, the total thickness of the first and second sheets of the present invention, As shown in FIG.

thickness
(탆)
Temperature (℃)
Size (mm)

Outside temperature (℃)
10 minutes / 25 minutes / 30 minutes 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 The first 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 The second 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 sheet of the comparative example of the present invention were produced under the conditions shown in Table 1, adhered to the digitizer panel of the portable terminal, and then, after the lapse of time in the communication state of the portable terminal, As a result, it was found that the first and second sheets of the present invention exhibited excellent heat radiation characteristics by 0.2 to 0.9 ° C lower than those of the sheets of the comparative example, Is superior in heat transfer inhibiting ability.

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

As shown in FIG. 5, 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 PET (polyethylene terephthalate) 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 hybrid sheet for a digitizer according to the present invention is attached to an electronic device.

Referring to FIG. 6, a hybrid sheet for a digitizer according to an embodiment of the present invention may include a plurality of magnetic sheets. At this time, the double-sided tapes 120A1, 120A2, and 120A3 bonded to the bottoms of the magnetic sheets 100A1, 100A2, and 100A3 are repeatedly stacked on the heat spreader 130. That is, the first set of the magnetic sheet 100A1 and the double-sided tape 120A1 are laminated on the heat spreader 130 and the magnetic sheet 100A2 and the double-sided tape 120A2 are laminated on the first set of magnetic sheets 100A1 And a third set of the magnetic sheet 100A3 and the double-sided tape 120A3 is laminated on the second set of magnetic sheets 100A2. When the hybrid sheet for a digitizer includes a plurality of magnetic sheets 100A1, 100A2, and 100A3, the heat collecting ability is increased, the heat insulating function is improved, and the magnetic 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 a method of manufacturing a hybrid sheet for a digitizer according to an embodiment of the present invention, a ribbon made of an amorphous alloy or a nano-crystal alloy is manufactured by a rapid quenching method (RSP) by melt spinning (S100). At this time, in order to facilitate the post-treatment after the heat treatment, the sheet is cut into a predetermined length and laminated in a sheet form.

When the ribbon is an amorphous alloy, an extremely thin amorphous ribbon of an Fe-based amorphous ribbon, for example, an Fe-Si-B or Fe-Si-B-Co alloy of 30um or less is obtained by a rapid coagulation method (RSP) The laminated ribbon is heat-treated at a temperature of 300 ° C to 600 ° C for 30 minutes to 2 hours so as to obtain a desired permeability (S110).

In this case, the heat treatment atmosphere is performed in a temperature range where oxidation is not generated even though the Fe content of the ribbon is high. Therefore, it is not necessary to perform the heat treatment in the atmosphere, and the heat treatment may proceed in the atmosphere. Further, even if the heat treatment is performed in an oxidizing atmosphere or a nitrogen atmosphere, the magnetic permeability of the amorphous ribbon is not substantially different under the same temperature condition.

When the temperature of the heat treatment is less than 300 ° C, it has a higher permeability than the desired permeability and requires a longer heat treatment time. When the temperature exceeds 600 ° C, the permeability is remarkably lowered due to the superheating treatment, . Generally, if the heat treatment temperature is low, the treatment time is long. On the contrary, if the heat treatment temperature is high, the treatment time is shortened.

When the ribbon is made of a nanocrystalline alloy, an extremely thin amorphous ribbon of 30 μm or less made of an Fe-based amorphous ribbon, for example, an Fe-Si-B-Cu-Nb alloy is formed by a rapid coagulation method (RSP) And the laminated ribbon sheet is subjected to a heat treatment for 30 minutes to 2 hours at a temperature of 400 ° C to 700 ° C to form a nanocrystalline ribbon sheet having nanocrystalline grains so as to obtain a desired permeability.

In this case, since the content of Fe is 70 at% or more in the heat treatment atmosphere, if the heat treatment is performed in the air, oxidation is performed, which is not preferable from the viewpoint of the visual point. However, even if the heat treatment is performed in the oxidizing atmosphere, the permeability of the sheet is not substantially different at the same temperature condition.

In this case, when the heat treatment temperature is lower than 400 ° C., nanocrystalline grains are not sufficiently generated and desired magnetic permeability can not be obtained and the heat treatment time is long. In the case where the temperature exceeds 700 ° C., the permeability is remarkably lowered there is a problem. If the heat treatment temperature is low, the treatment time is long. On the other hand, if the heat treatment temperature is high, the treatment time is preferably shortened.

Also, in the present invention, a ribbon having a thickness in the range of 15 to 35 um is used, and the permeability of the ribbon increases in proportion to the thickness of the ribbon.

In addition, the ribbon may be brittle when heat treated, resulting in easier flaking when flakes are applied in subsequent processes.

Next, a first double-sided tape is attached to one side of the heat-treated ribbon, and a flip is performed in a state where a release film is attached to the other side with a second double-sided tape (S120).

The flake processing separates the ribbon into a plurality of fine pieces by passing a laminated sheet, for example, a first double-sided tape, a ribbon and a second double-sided tape and a release film in sequence, through a flake device. Here, a ribbon is adhered to the lower part of the first double-sided tape, and a release film or a protective film can be adhered to the upper part of the first double-sided tape.

The usable flake device may be composed of, for example, a metal roller having a plurality of recesses and protrusions formed on its outer surface and a rubber roller arranged to face the metal roller.

As described above, when the laminated sheet is passed through the flake device, the ribbon is divided into a plurality of minute pieces, and a minute space is generated between the minute pieces.

Since many microstructures of the ribbon are formed to have a size ranging from several tens of μm to 3 mm, the semi-magnetic field is increased to remove the hysteresis loss, thereby increasing the uniformity of the permeability to the sheet.

In addition, when the flake process is performed only, the minute pieces may contact each other due to the flow of the minute pieces, thereby increasing the size of the minute pieces and increasing the eddy current loss.

Moreover, the flaked laminated sheet may cause surface unevenness of the sheet during the flake treatment, and stabilization of the flaked ribbon is necessary.

Therefore, a lamination process for planarization, slimming, and stabilization of the flaked laminated sheet is performed (S130). At this time, it is preferable to carry out laminating under the process conditions that can prevent the adhesive from penetrating into the micro space, so that the micro seat for heat trapping is present in the magnetic sheet.

Here, it is possible to prevent the adhesive from penetrating into the micro space according to the properties of the adhesive and the laminating process conditions, and in some cases, the adhesive may be penetrated into the micro-space in some areas of the laminated sheet that have been flaked by the laminating process.

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

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

Referring to FIG. 8, a portable terminal according to an embodiment of the present invention includes a case 1100 and 1110, a main PCB (not shown) disposed in an inner space of the case 1100 and 1110 and mounting various circuit components, A digitizer panel 1130 for performing an electronic pen function and a hybrid sheet for a digitizer 1130 disposed on the rear surface of the digitizer panel 1130 and mounted inside the case 1100 and 1110, And a frame 1150 for fixing various components to be 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 include a touch screen for inputting information by a user's touch.

Since such a portable terminal is portable, it must be light in weight and strong in strength. To this end, the frame 1150 uses a magnesium frame having a light weight and high strength.

The hybrid sheet for a digitizer of the present invention can be mounted on an electronic apparatus including the aforementioned portable terminal. This electronic apparatus is provided with a digitizer panel and can perform the function of the electronic pen.

Such electronic apparatuses are used in portable electronic apparatuses such as mobile phones, smart phones, notebook computers, digital broadcasting terminals, personal digital assistants (PDAs), portable multimedia players (PMPs) And large electronic devices including heat-generating components.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limited to the embodiments set forth herein. Various changes and modifications may be made by those skilled in the art.

10: Cu layer 13: crack
21,23,50,110,120,120A1,120A2,120A3: Double-sided tape
25, 30, 100, 100A1, 100A2, 100A2:
The present invention relates to a digitizer panel and a digitizer panel, and more particularly, to a digitizer panel and a digitizer panel,

Claims (11)

A hybrid sheet laminated on a digitizer panel of an electronic device for simultaneously performing electromagnetic shielding, heat insulation, and heat radiation functions,
An amorphous magnetic sheet that shields an electromagnetic field and suppresses heat transfer in a vertical direction;
A first adhesive member laminated on the amorphous magnetic sheet;
A second adhesive member laminated on the lower portion of the amorphous magnetic sheet; And
And a heat spreader which is adhered to the amorphous magnetic sheet by the second adhesive member and diffuses heat generated locally in a horizontal direction to dissipate heat. The method according to claim 1,
Wherein the amorphous magnetic sheet comprises a plurality of micro-pieces and / or cracks separated and formed by heat-treating an Fe-based amorphous alloy, a Co-based amorphous alloy, or a nanocrystalline alloy ribbon after flaking. The method according to claim 1,
Wherein the amorphous magnetic sheet has a permeability of 100 to 200 at a frequency of 100 to 560 KHz, a resistivity of 150 Ω · cm or more, and a thickness of 5 to 50 μm. The method of claim 3,
The amorphous magnetic sheet has a thickness of 25 to 27 um. The method of claim 1, wherein
A hybrid sheet for a digitizer in which a plurality of amorphous magnetic sheets are laminated. The method according to claim 1,
Wherein the first and second adhesive members are double-sided tapes and the thickness of the first adhesive member is thicker than the thickness of the second adhesive member. The method according to claim 1,
Wherein the heat spreader comprises a thin sheet sheet made of a metal or a non-metal having a thermal conductivity of 200 W / mK or more. 8. The method of claim 7,
Wherein 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 laminated structure thereof. Heat treating the ribbon of an amorphous alloy or a nanocrystalline 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, and then flaking the ribbon; And
And adhering a heat spray to the second double-sided tape. 10. The method of claim 9,
Further comprising the step of laminating the flaked laminated sheet after the flake processing step. case;
A display panel disposed on a front surface of the case;
A digitizer panel disposed on a rear surface of the display panel; And
The electronic device according to any one of claims 1 to 8, wherein the digitizer panel is bonded to the back surface of the digitizer panel.

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