WO2014137151A1 - Composite sheet for shielding magnetic field and electromagnetic wave, and antenna module comprising same - Google Patents

Abstract

The present invention relates to a composite sheet for shielding a magnetic field and an electromagnetic wave, and an antenna module using the same, which can block influence of a magnetic field on a main body and a battery of a mobile terminal device, and the like, and shield an electromagnetic wave at the same time, by significantly reducing a loss due to an eddy current by flaking an amorphous ribbon sheet. The composite sheet according to the present invention comprises: a magnetic sheet; and a conductor sheet for shielding an electromagnetic wave and radiating heat, the conductor sheet being stacked on the magnetic sheet. The magnetic sheet comprises: an amorphous ribbon sheet which is thermally treated, flaked, and then separated into a plurality of minute pieces; a protective film bonded to one side surface of the amorphous ribbon sheet; and an adhesive tape bonded to the other side surface of the amorphous ribbon sheet.

Description

Composite sheet for magnetic field and electromagnetic shielding and antenna module having same

According to the present invention, a magnetic field capable of shielding electromagnetic waves and blocking electromagnetic field effects on a main body and a battery of a mobile terminal device by greatly reducing the loss caused by eddy current by flake processing of an amorphous ribbon sheet, and It relates to an electromagnetic shielding composite sheet and an antenna module having the same.

Recently, various functions such as RFID (Radio Frequency Identification), Near Field Communication (NFC), Wireless Charger, Interactive Pen Tablet, etc. have been added to portable terminals including mobile phones and tablet PCs.

NFC is an electronic tag, a non-contact short-range wireless communication module using the 13.56Mz frequency band and transmits data between terminals at a close distance of 10 cm. NFC is not only mobile payment but also file transfer method, and is widely used in supermarkets or general stores to transmit goods information or travel information for visitors, transportation, and access control lock.

In addition, the Android Beam, which was recently installed by Google, has a near field communication (NFC) -based short-range information transmission / reception function, which enables not only mobile payment but also photos, business cards, files, maps and websites. It provides the ability to forward to another phone.

In the mobile terminal device, a radio frequency identification (RFID) wireless environment is widely used. For example, an NFC chip for implementing Near Field Communication (NFC) is installed in the mobile terminal device. When a contactless smart card, such as a USIM (Universal Subscriber Identity Module) card, is attached to an external RF reader, the information of the USIM card of the mobile terminal device is read by the RF reader and recorded necessary information by near field communication. For example, a built-in function such as an electronic money function (e.g., an electronic money function) is realized.

At this time, information exchange between the NFC chip and the RF reader is driven by the induced electromotive force at 13.56 MHz between the primary coil (antenna) installed in the RF reader and the coil (antenna) of the NFC chip installed in the portable terminal. By supplying power for

In general, a contactless (wireless) charging antenna is installed in the battery cover of the portable terminal device. As the charging circuit to which the antenna is connected is recently miniaturized and built in the portable terminal device, only the antenna (part) is included in the battery cover Left.

In addition, the NFC chip installed in the portable terminal device has been developed to operate as an RFID reader to read information recorded in an external RFID tag. When the NFC chip operates as an RF reader, an antenna (coil) connected to the NFC chip acts as a primary coil to transmit power, and induction electromotive force is generated from a coil (antenna) installed in an external RFID tag to wirelessly communicate. To be realized.

In other words, in order to apply the RFID system (NFC) to the portable terminal, a spiral coil type loop antenna capable of generating induced electromotive force is required, and an NFC antenna is mainly installed in a battery cover.

In this case, the induced electromotive force induced in the loop antenna of the helical coil type is determined by Faraday's law and Lenz's law. Therefore, in order to obtain a high voltage signal, the induced electromotive force is interlinked with the secondary coil (antenna coil). The greater the amount of magnetic flux, the better. The amount of magnetic flux increases as the amount of soft magnetic material included in the secondary coil increases, and as the material permeability increases.

In addition, a magnetic field of 100 kHz to several tens of MHz is generated in the antenna coil provided in the portable terminal when performing a near field communication (NFC) function with an adjacent terminal.

Accordingly, the portable terminal device having such additional functions prevents heat generation due to eddy currents in the components (particularly, the battery) of the portable terminal device due to the magnetic field, and also maximizes the performance of the additional function by focusing the magnetic field. In order to achieve this, a magnetic shielding sheet is essentially used.

As such a magnetic shielding sheet, it is common to use a magnetic material such as an amorphous ribbon, ferrite, or a polymer sheet containing magnetic powder. The magnetic field focusing effect to improve magnetic shielding and add-on performance is as follows: amorphous magnetic ribbon with high magnetic permeability, ferrite, and polymer sheet containing magnetic powder.

Korean Patent No. 10-523313 has a composition selected from the group consisting of Fe-Si-B, Fe-Si-B-Cu-Nb, Fe-Zr-B and Co-Fe-Si-B and includes an amorphous alloy. Absorption for an RFID antenna made of a magnetic sheet, an RFID antenna and a wireless identification device including the same have been proposed.

The Korean Patent No. 10-523313 is a kind of polymer sheet made of a sheet by mixing amorphous alloy powder with a resin, and there is a problem in that the permeability, that is, the inductance value of the sheet is lower than 10 μH.

Furthermore, Korean Patent No. 10-623518 discloses first and second magnetic sheet layers made of an alloy powder containing at least one amorphous alloy in order to simplify the manufacturing process of Korean Patent No. 10-523313 and increase the permeability. After stacking the first amorphous alloy ribbon in between, and to increase the relative density of the laminated sheet and at the same time to form a micro crack in the first amorphous alloy ribbon, the laminated multi-layer sheet produced by rolling or pressing by compression molding A magnetic sheet for RFID and an RFID antenna using the same are disclosed.

Although the Korean Patent No. 10-623518 forms a micro crack in the first amorphous alloy ribbon by compression molding the multilayer magnetic sheet layer, the micro crack has a limit in lowering the magnetic resistance, and is caused by eddy currents. There is a problem that can not greatly reduce the loss.

Meanwhile, the portable terminal device is provided with a wireless charging antenna for wireless charging together with the NFC antenna in the battery pack.

In this case, when the power transmission speed increases from the primary side of the wireless charger, not only coupling between adjacent transformers but also defects due to heat generation are likely to occur in the peripheral parts thereof. That is, in the case of using a planar coil, the magnetic flux passing through the planar coil is connected to a substrate or the like inside the device, and the inside of the device generates heat by eddy current generated by electromagnetic induction. As a result, there was a problem that a large power could not be transmitted and charging time was long.

The power receiving device of the conventional non-contact type charging system has a high permeability and a large permeability on the surface opposite to the primary coil side, that is, the surface of the secondary coil, in order to enhance coupling and improve shielding to improve heat generation and improve heat shielding. The magnetic body (magnetic sheet) of a volume is arrange | positioned. According to this arrangement, the variation in the inductance of the primary coil increases, and a problem arises in that the operating condition of the resonant circuit deviates from the resonance condition in which the sufficient effect can be exerted according to the relative positional relationship between the magnetic body and the primary coil.

Currently, the antenna for NFC using the 13.56Mz frequency band is implemented using a ferrite sheet with low frequency dependency.

The magnetic permeability of the ferrite sheet or the polymer sheet containing the magnetic powder is somewhat lower than that of the amorphous ribbon, and in order to improve the performance of the low magnetic permeability, the thickness becomes thinner than the amorphous ribbon, which is tens of μm thick thin sheets. It is difficult to cope with the handset trend.

In addition, in case of amorphous ribbon with high magnetic permeability, there is no burden on thickness because the ribbon itself is a metal thin plate. Deterioration or problems such as deterioration of efficiency and heat generation during wireless charging.

In the case of wireless chargers, in order to maximize the efficiency of the charger, there are many structures in which the permanent magnet is used in the power transmission transmitter to help align with the receiver, and the thin shielding sheet is saturated due to the DC magnetic field of the permanent magnet. Occurs, the performance is degraded or the power transmission efficiency drops sharply.

Accordingly, in order to exhibit the shielding characteristics without being affected by the permanent magnet, the thickness of the shielding sheet must be very thick to 0.5T or more, thereby maintaining a desired power transmission efficiency, which is a great obstacle to slimming the portable terminal.

Since the voltage induced in the secondary coil of the NFC antenna and the wireless charger is determined by Faraday's law and Lenz's law, it is necessary to bridge the secondary coil to obtain a high voltage signal. The higher the amount of magnetic flux is, the better. The amount of magnetic flux increases as the amount of soft magnetic material included in the secondary coil increases, and as the material permeability increases. In particular, since near field communication (NFC) and wireless charging are inherently non-contact power transmission, a magnetic field in which a secondary coil is mounted is used to focus radio electromagnetic waves generated by a primary coil of a transmitter to a secondary coil of a receiver. It is necessary that the shield sheet is made of a magnetic material having a high permeability.

Conventional NFC and magnetic field shielding sheet for wireless charging is a thin film does not present a solution to increase the heat generation problem and wireless charging efficiency by shielding. Accordingly, the present inventors recognize that the inductance (permeability) decreases even if the ribbon becomes flake in the case of the amorphous ribbon, and the quality factor (Q) of the secondary coil increases as the decrease in the magnetic resistance increases. It came.

Therefore, the present invention has been proposed to solve the above problems of the prior art, and its object is to significantly reduce the loss due to eddy current by flake processing of the amorphous ribbon, such as a main body and a battery of a mobile terminal device. The present invention provides an antenna module including a magnetic sheet and an electromagnetic shielding composite sheet which can increase the communication distance and charging efficiency by increasing the quality factor (Q) of the secondary coil while blocking the influence of the magnetic field.

Another object of the present invention is to fill the gap between the fine pieces of the amorphous ribbon by the crushing lamination treatment after the amorphous ribbon to prevent the penetration of moisture by the adhesive filling the fine pieces by wrapping the fine pieces with an adhesive (dielectric) at the same time The present invention provides a composite sheet for shielding magnetic fields and electromagnetic waves, which is capable of preventing eddy currents from being insulated from each other and preventing a drop in shielding performance.

Still another object of the present invention is to provide a magnetic sheet and an electromagnetic shielding composite sheet and an antenna module having the same, which prevents an increase in the frequency fluctuation range when the NFC antenna is mounted on the battery pack, thereby reducing the defective rate of the NFC antenna.

Another object of the present invention is to provide a conductor sheet having electromagnetic shielding and heat dissipation function on one side, and at the same time serves as a heat shielding layer capable of collecting heat by a plurality of micropores provided in the shielding sheet, The present invention provides a composite sheet for shielding magnetic fields and electromagnetic waves capable of performing both heat dissipation and thermal insulation, and an antenna module having the same.

Another object of the present invention is to provide a multi-sheet magnetic field and electromagnetic shielding composite sheet and an antenna module having the same that can be carried out both heat diffusion, heat collection and electromagnetic and magnetic field shielding in a single sheet.

Another object of the present invention to provide a magnetic sheet and electromagnetic shielding composite sheet and an antenna module having the same that can be used simultaneously for NFC and wireless charging.

In order to achieve the above object, the present invention is heat-treated and flake-treated amorphous ribbon sheet separated into a plurality of fine pieces, a protective film adhered to one side of the amorphous ribbon sheet and the other side of the amorphous ribbon sheet A magnetic sheet having an adhesive tape; It provides a magnetic sheet and electromagnetic shielding composite sheet comprising a; and the electromagnetic shielding and heat dissipation conductor sheet laminated to the magnetic sheet.

According to another feature of the invention, the present invention is a magnetic permeability of the first magnetic sheet; And a second magnetic sheet laminated on the first magnetic sheet having a second permeability lower than that of the first magnetic sheet, wherein the first magnetic sheet is divided into a plurality of fine pieces and the plurality of fine pieces It is disposed on the same plane, the protective film and the double-sided tape is laminated on both sides, the gap between the plurality of fine pieces is a magnetic field and electromagnetic shielding composite sheet filled with a part of the adhesive layer included in the protective film and the double-sided tape to provide.

According to another feature of the invention, the present invention is made of a loop form on the substrate and the NFC antenna for transmitting and receiving NFC (Near field communications) signal; And it provides an antenna module comprising a composite sheet for shielding the magnetic field and electromagnetic waves stacked on the substrate.

According to another feature of the invention, the present invention is a wireless charging secondary coil for receiving a high-frequency power signal for wireless charging and formed in a loop form on the outside of the substrate and the NFC antenna coil for transmitting and receiving high-frequency signals for NFC Dual antenna provided; And it provides an antenna module comprising a composite sheet for shielding the magnetic field and electromagnetic waves stacked on the substrate.

According to another feature of the invention, the invention consists of a coil portion formed in a spiral pattern on the surface of the substrate and the first to third terminal terminals extending therefrom and between the first terminal terminal and the second terminal terminal; NFC and wireless high-frequency antenna for transmitting and receiving, and receiving a high-frequency signal for wireless transmission transmitted from the transmitter of the wireless charger from between the third terminal terminal and the first or second terminal terminal; And it provides an antenna module comprising a composite sheet for shielding the magnetic field and electromagnetic waves stacked on the substrate.

As described above, in the present invention, the loss of the eddy current is greatly reduced by the flake processing of the amorphous ribbon, thereby preventing the magnetic field effects on the main body and the battery of the mobile terminal device and the quality of the secondary coil. By increasing the coefficient Q, the power transmission efficiency is excellent, and the communication distance is increased.

In addition, in the present invention, the gap between the fine pieces of the amorphous ribbon is filled by the adhesive lamination treatment after the flake treatment of the amorphous ribbon to prevent moisture penetration and at the same time, all surfaces of the fine pieces are surrounded by the adhesive (dielectric). It is possible to prevent the deterioration of the shielding performance by reducing the eddy current by insulating fine pieces from each other. Further, by enclosing all sides of the fine pieces with an adhesive (dielectric), moisture can penetrate, and the amorphous ribbon is oxidized to prevent changes in appearance and deterioration of properties.

Furthermore, in the present invention, when the NFC antenna is mounted on the battery pack, the frequency fluctuation range can be prevented from increasing, thereby reducing the defective rate of the NFC antenna.

In the present invention, by providing a conductive sheet having excellent electrical conductivity and thermal conductivity on one side of the sheet, electromagnetic wave shielding is possible and rapid diffusion of locally conducted heat can be achieved, and a plurality of micropores provided in the shielding sheet are conductive. By acting as a heat shield layer that can collect heat by blocking the convection of the heat, it can perform both electromagnetic shielding and heat dissipation and heat insulation.

As a result, the composite sheet of the present invention can perform heat diffusion (dispersion), heat collection (insulation), electromagnetic wave and magnetic field shielding in a single sheet, and can be implemented in an ultra-thin.

1 is an exploded perspective view showing a magnetic shielding sheet for NFC and wireless charging according to the present invention,

2 is a cross-sectional view showing an example of using one sheet of nanocrystalline ribbon according to the first embodiment;

3 is a cross-sectional view showing an example of using six nano-crystal ribbon sheet according to the second embodiment,

4 and 5 are cross-sectional views showing the structure of the protective film and double-sided tape used in the present invention, respectively;

6 is an exploded perspective view showing a magnetic shielding sheet for NFC and wireless charging according to a third embodiment of the present invention;

7 is a process chart for explaining a process for manufacturing a magnetic shielding sheet for NFC and wireless charging according to the present invention;

8 and 9 are cross-sectional views showing the flake process of the laminated sheet according to the present invention, respectively;

10 is a cross-sectional view showing a state where the flakes of the laminated sheet according to the present invention;

11 and 12 are cross-sectional views showing the lamination process of the flake-laminated sheet according to the invention, respectively;

13 is a cross-sectional view showing a state in which the laminate after the flake processing of the NFC and wireless charging magnetic shielding sheet according to the first embodiment of the present invention,

14A and 14B are enlarged photographs of the humidity test of the magnetic field shielding sheet not subjected to the lamination process after the flake treatment, respectively, and an enlarged photograph after the humidity test of the laminated magnetic field shielding sheet after the flake treatment according to the present invention;

15 is a cross-sectional view showing a thin magnetic sheet used in the magnetic shielding sheet for NFC and wireless charging according to a fourth embodiment of the present invention;

16 is a cross-sectional view showing a composite sheet for shielding electromagnetic fields and electromagnetic waves according to a fifth embodiment of the present invention;

17 is an exploded perspective view showing the structure of an NFC antenna module according to the present invention;

18 is an exploded perspective view illustrating that the NFC antenna module of FIG. 17 is assembled to a battery cover and coupled to a portable terminal device;

19 is a plan view illustrating a dual antenna structure in which an NFC antenna and a wireless charging antenna are formed in one FPCB according to the present invention;

20A and 20B are a plan view and an equivalent circuit diagram showing a structure in which an integrated antenna for NFC and wireless charging is implemented using one coil in one FPCB according to the present invention, respectively.

The above objects, features, and advantages will become more apparent from the following detailed description with reference to the accompanying drawings, and as such, those skilled in the art to which the present invention pertains may share the spirit of the present invention. It will be easy to implement.

In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

1 is an exploded perspective view showing an NFC and a wireless charging magnetic shielding sheet according to the present invention, Figure 2 is a cross-sectional view showing an example of using a sheet of nano-crystal ribbon according to the first embodiment.

1 and 2, the NFC and wireless charging magnetic shielding sheet 10 according to the first embodiment of the present invention is a plurality of fine pieces by heat treatment after the ribbon of the amorphous alloy or nanocrystalline alloy after flake treatment A multilayer thin magnetic sheet 2 of at least one or more layers in which separation and / or cracks are formed by a thin film 20, a protective film 1 adhered to an upper portion of the thin magnetic sheet 2, and the thin magnetic sheet ( And a release film 4 detachably adhered to the lower portion of the double-sided tape 3.

The thin magnetic sheet 2 may be, for example, a thin ribbon made of an amorphous alloy or a nanocrystalline alloy.

The amorphous alloy may be a Fe-based or Co-based magnetic alloy, it is preferable to use a Fe-based magnetic alloy in consideration of the material cost.

As the Fe-based magnetic alloy, for example, a Fe-Si-B alloy can be used, 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 the metal, including Fe, the higher the saturation magnetic flux density, but when the content of the Fe element is too high, it is difficult to form amorphous. In the present invention, the content of Fe is preferably 70-90 atomic%. Further, 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 a small amount of other metal elements may be included as necessary to impart other properties.

As the Fe-Si-B alloy, for example, a crystallization temperature of 508 ° C and a Curie temperature (Tc) of 399 ° C may be used. However, this crystallization temperature may vary depending on the content of Si and B or other metal elements and their content added in addition to the tertiary alloy component.

In the present invention, an Fe-Si-B-Co-based alloy may be used as the Fe-based amorphous alloy.

On the other hand, the thin magnetic sheet 2 may be a ribbon of a thin plate made of a Fe-based nanocrystalline magnetic alloy.

As the Fe-based nanocrystalline magnetic alloy, it is preferable to use an alloy that satisfies the following expression (1).

Equation 1

In Equation 1, A is at least one element selected from Cu and Au, D is selected from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Ni, Co and rare earth elements 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 relations 0.01≤c≤8at%, 0.01≤d≤10at%, 0≤e≤10at%, 10≤f≤25at%, 3≤g≤12at%, 15 ≤ f + g + h ≤ 35 at%, respectively, and the area ratio of the alloy structure is 20% or more of the microstructure having a particle size of 50nm or less.

In the above Equation 1, element A is used to improve the 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. If the content of element A is too small, it is difficult to obtain the effect of suppressing coarsening of crystal grains. On the contrary, when there is too much content of A element, magnetic property will deteriorate. Therefore, it is preferable to make content of element A into the range of 0.01-8 at%. D element is an element effective for uniformizing the grain diameter and reducing the magnetic strain. It is preferable to make content of D element into the range of 0.01-10 at%.

The element E is an element effective for improving the soft magnetic properties and the corrosion resistance of the alloy. It is preferable to make content of E element into 10 at% or less. Si and B are elements which form amorphousization of the alloy at the time of magnetic sheet manufacture. It is preferable to make content of Si into the range of 10-25 at%, and it is preferable to make content of B into the range of 3-12 at%. In addition, Z element may be included in the alloy as an amorphous compositional element of alloys other than Si and B. In that case, it is preferable to make the total content of Si, B, and Z elements into the range of 15-35 at%. The fine crystal structure is preferably formed to realize a structure in which grains having a particle diameter of 5 to 30 nm exist in the range of 50 to 90% by area ratio in the alloy structure.

In addition, the Fe-based nanocrystalline magnetic alloy used in the thin magnetic sheet 2 may be a Fe-Si-B-Cu-Nb alloy, in this case, Fe is 73-80 at%, the sum of Si and B It is preferable that the sum of this 15-26 at% and Cu and Nb is 1-5 at%. This composition range of the amorphous alloy produced in the form of a ribbon can be easily precipitated into the crystal grains of the nano phase by the heat treatment described later.

The protective film 1 is, for example, polyethylene terephthalate (PET) film, polyimide film, polyester film, polyphenylene sulfate (PPS) film, polypropylene (PP) film, polyterephthalate as shown in FIG. A resin film 11 such as a fluororesin film such as (PTFE) can be used, and is attached to one side of the thin magnetic sheet 2 via the first adhesive layer 12.

In addition, the protective film 1 can use the thing of 1-100 micrometers, Preferably it is 10-30 micrometers, It is good to have a thickness of 20 micrometers more preferably.

The protective film 1 used in the present invention is a release film 4a attached to protect the first adhesive layer 12 on the other surface of the first adhesive layer 12 when attached to one side of the thin magnetic sheet 2. Is removed and attached.

In addition, as shown in FIG. 5, the double-sided tape 3 is used as a base material 32 made of a fluororesin-based film such as, for example, a polyethylene terephthalate (PET) film, so that the second and third adhesive layers 31 are formed on both sides thereof. , 33 is used, and the release film 4 is attached to the outer surfaces of the second and third adhesive layers 31 and 33. The release film 4 is integrally formed at the time of manufacture of the double-sided tape 3, and is peeled off and removed when the shielding sheet 10 is attached to the battery cover or the rear cover of the electronic device.

The magnetic field shielding sheet for NFC and wireless charging according to the third embodiment shown in FIG. 3 is used in order to bond the plurality of amorphous ribbon sheets 21-26 used as the multilayer thin magnetic sheet 2 to each other. The double-sided tape 3a-3e inserted between -26) removes and uses both the release films 4 and 4b on both sides.

The double- sided tape 3,3a-3f is also applicable to the type with a base material as described above, and an inorganic material type formed only of an adhesive layer without a base material. In the case of the double-sided tape 3a-3e inserted between the amorphous ribbon sheets 21-26, it is preferable to use an inorganic material type from the viewpoint of thinning.

As the first to third adhesive layers 12, 31, and 33, for example, an acrylic adhesive may be used, and other types of adhesives may be used.

The double-sided tape 3 can use what has thickness of 10, 20, and 30 micrometers, Preferably, it has a thickness of 10 micrometers.

The thin magnetic sheet 2 used for the shielding sheet 10 may have a thickness of, for example, 15 to 35 μm per sheet. In this case, considering the handling process after the heat treatment of the thin magnetic sheet 2, the thickness of the thin magnetic sheet 2 is preferably set to 25 to 30 μm. As the thickness of the amorphous ribbon becomes thinner, cracking of the ribbon may occur even with slight impact during handling after heat treatment.

As shown in FIGS. 17 and 18, the magnetic shielding sheet 10 is used by attaching the NFC antenna 6 to the shielding sheet 10 using the double-sided tape 30b.

In addition, the magnetic shielding sheet 10 may be used in combination with the dual antennas 40 and 50 for NFC and wireless charging shown in FIGS. 19 to 20b.

At the time of wireless charging, since the secondary coil of the dual antenna 40 for NFC and wireless charging, that is, the antenna coil 43 forms a resonant circuit, the shield sheet 10 is a resonant circuit formed by the secondary coil 43. This will affect the inductance of the furnace.

The shielding sheet 10 serves as a magnetic shield to block the effect of, for example, a 300 kHz wireless power signal on the portable terminal 101 from the transmitting device, and simultaneously transmits the wireless power signal to the secondary coil 43 of the receiving device. It serves as an inductor to induce reception with high efficiency.

In general, when a mobile terminal having a built-in NFC chip approaches an external RF reader, a 13.56 MHz NFC high frequency signal is applied from a primary coil (antenna) installed in the RF reader, the coil of the NFC chip installed in the portable terminal (antenna) Induced electromotive force is generated. By supplying electric power for driving a USIM (Universal Subscriber Identity Module) card by induced electromotive force, the information of the USIM card of the mobile terminal device is read by the RF reader and recorded the necessary information by near field communication, for example, electronically. Built-in functions such as money functions (e.g., electronic money functions) are realized.

When near field communication (NFC) is performed, the magnetic shielding sheet 10 has an effect on the portable terminal device 101 by a high frequency signal for NFC of 13.56 MHz generated from a primary coil (antenna) installed in an RF reader. At the same time as the magnetic field shielding to cut off, the NFC antenna 6 serves as an inductor for inducing high frequency signals for NFC to be received with high reception sensitivity.

The thin magnetic sheet 2 is separated into a plurality of fine pieces 20 by flake processing, as shown in Figs. 2 and 3, it is preferable that the plurality of fine pieces 20 has a size of several tens of micrometers ~ 3mm or less.

When the thin magnetic sheet 2 is flaked and separated into a plurality of fine pieces 20, the magnetic resistance R is reduced more than the decrease in the inductance L value of the magnetic sheet. As a result, when flake processing of the thin magnetic sheet 2 is performed, the quality coefficients of the resonant circuit formed by the NFC antenna coil 6a in NFC communication and the resonant circuit formed by the secondary coil of the receiver during wireless charging ( Q) increases to increase the power transmission efficiency.

In addition, when the thin magnetic sheet 2 is separated into a plurality of fine pieces 20, it is possible to block the heat generation problem of the battery by reducing the loss due to the eddy current.

Furthermore, in the present invention, the thin magnetic sheet 2 is flakes as shown in FIG. 10, and then laminated as shown in FIG. 13, and thus the first and second adhesive layers 12 are formed as a gap 20a between the plurality of fine pieces 20. A part of, 31 penetrates, and the plurality of fine pieces 20 are separated by the first and second adhesive layers 12 and 31 serving as dielectrics.

As a result, when only the flake processing is performed, as the fine pieces 20 are in contact with each other according to the flow of the fine pieces 20, the size of the fine pieces 20 may increase, so that the eddy current loss may increase. This problem is avoided because the entire surface of the fine piece 20 is surrounded by the dielectric by the lamination process.

As shown in FIG. 2, the magnetic field shielding sheet 10a for NFC and wireless charging according to the first embodiment of the present invention is formed on one side using one amorphous ribbon sheet 21 as a thin magnetic sheet 2. The protective film 1 is bonded, and the release film 4 is bonded to the other side via the double-sided tape 3.

In addition, the magnetic field shielding sheet 10b of the present invention, as in the second embodiment shown in Figure 3, to improve the quality factor (Q) and power transmission efficiency of the secondary coil 43 of the receiving device thin magnetic sheet ( As 2), many amorphous ribbon sheets 21-26 can be laminated | stacked and used. The protective film 1 is adhered to one side of the thin magnetic sheet 2, and the release film 4 is adhered to the other side via the double-sided tape 3f.

The wireless charger may employ a permanent magnet in the power transmission transmitter to help align with the receiver to maximize the efficiency of the charger. That is, by providing a circular permanent magnet inside the primary coil (transmitting coil) of the transmitter, it makes an accurate position alignment with the receiver placed on the transmitter, and holds the receiver stationarily.

Therefore, the magnetic shielding sheet for wireless charging is required to shield not only the alternating current (AC) magnetic field generated by the power transmission of 100 to 150KHz (or 300KHz) frequency from the transmitter but also the direct current (DC) magnetic field by the permanent magnet. do.

However, since the direct current (DC) magnetic field is larger than the influence on the magnetic shielding sheet 10 by the alternating current (AC) magnetic field, the thin shielding sheet is self-saturated to degrade the performance as the shielding sheet or rapidly reduce the power transmission efficiency. Dropping problem occurs.

Accordingly, in the case where the permanent magnet is used as the transmitter of the wireless charger, it is required to determine the amorphous ribbon sheets 21-26 to be laminated in consideration of the number of layers in which the magnetic saturation is performed by the permanent magnet.

In addition, the Fe-based amorphous alloy has a larger saturation magnetic field than the nanocrystalline alloy. Accordingly, in the case of using a plurality of amorphous ribbon sheets 21-26 made of an Fe-based amorphous alloy, two to eight layers can be laminated and used, for example, a high permeability can be obtained by using three to five layers. It is preferable to lose. In this case, the inductance (ie, permeability) of the laminated sheet is preferably about 13 to 19 mu H.

In addition, in the case of using a plurality of amorphous ribbon sheets 21-26 made of nanocrystalline alloys, 4 to 12 layers can be laminated and used, for example, using 7 to 9 layers has a high permeability. desirable. In this case, the inductance (ie, permeability) of the laminated sheet is preferably about 13 to 21 mu H.

On the other hand, when the permanent magnet is not used as the transmitter of the wireless charger, it is also possible to use a relatively small number of amorphous ribbon sheets as compared with the case where the permanent magnet is adopted.

In this case, in the case of using an amorphous ribbon sheet made of an Fe-based amorphous alloy or a nanocrystalline alloy, one to four layers may be laminated and used, and the inductance (ie, permeability) of the laminated sheet is preferably about 13 to 21 μH. .

Referring to FIG. 3, the magnetic shielding sheet 10b according to the second embodiment is a thin magnetic sheet 2, for example, a case in which a plurality of amorphous ribbon sheets 21-26 are stacked. As shown, a plurality of adhesive layers or double-sided tapes 3a-3e are inserted between the plurality of amorphous ribbon sheets 21-26.

That is, the adhesive layer or the double-sided tape (3a-3e) to the amorphous ribbon sheet (filled in the gap (20a) between the fine pieces 20 to maintain the separated position during the flake and laminating process separated) Between 21-26).

Magnetic field shielding sheet 10-10b according to the present invention generally forms a rectangular or square quadrangular shape corresponding to a battery cell, in addition to polygonal or circular or ellipse, such as a pentagon, and partially rectangular and circular combinations. It may be formed in a shape, and preferably has a shape corresponding to the shape of the portion where the magnetic field shielding is required.

In addition, in the magnetic field shielding sheet according to the present invention, when the wireless charger includes a permanent magnet in the center of the primary coil, the shielding sheet is magnetized (saturated) by the magnetic field of the permanent magnet. Like the magnetic shielding sheet 10c of the third embodiment shown, it may be formed in an annular shape corresponding to the secondary coil 43 of the receiver.

The magnetic field shielding sheet 10c of the third embodiment has a shape of any one of a rectangle, a circle, and an oval in response to the secondary coil 43 of the receiver having a shape of any one of a rectangle, a circle, and an oval. In this case, the magnetic field shielding sheet 10c preferably has a width of about 1-2 mm wider than the width of the secondary coil 43.

In the magnetic field shielding sheet 10c of the third embodiment, an annular thin magnetic sheet 2b having an annular protective film 1a attached to its upper surface is attached to the release film 4 through an annular double-sided tape 30. It may have a structure.

The annular magnetic shielding sheet 10c preferably uses a rectangular release film 4 having an area larger than that of the magnetic shielding sheet 10c so as to be easily peeled from the release film 4.

Hereinafter, a method of manufacturing a magnetic shielding sheet according to the present invention will be described with reference to FIG. 7.

First, an amorphous ribbon made of an amorphous alloy or a nano-crystalline alloy is prepared by rapid quenching and solidification (RSP) by melt spinning (S11), and then first cut into a sheet shape to a predetermined length to facilitate post-treatment after heat treatment. A plurality of amorphous ribbon sheets are laminated (S12).

In the case where the amorphous ribbon is an amorphous alloy, a quench solidification method using melt spinning is performed on a Fe-based amorphous ribbon, for example, an ultra-thin amorphous ribbon having a thickness of 30 μm or less composed of Fe-Si-B or Fe-Si-B-Co alloy (RSP). ), The amorphous ribbon sheet laminated so as to obtain the desired permeability is subjected to a magnetic field heat treatment for 30 minutes to 2 hours in the temperature range of 300 ℃ to 600 ℃ (S13).

In this case, the heat treatment atmosphere does not need to be made in the atmosphere furnace even if the Fe content of the amorphous ribbon is high, since it is made in a temperature range where oxidation does not occur, 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, the permeability of the amorphous ribbon is not substantially different under the same temperature conditions.

If the heat treatment temperature is less than 300 ℃ exhibits a high permeability higher than the desired permeability, there is a problem that takes a long heat treatment time, and if the heat treatment temperature exceeds 600 ℃ there is a problem that the permeability is significantly lowered by overheating treatment does not exhibit the desired permeability. . In general, when the heat treatment temperature is low, the treatment time is long. On the contrary, when the heat treatment temperature is high, the treatment time is shortened.

In addition, when the amorphous ribbon is made of a nano-crystalline alloy, quench solidification method by melt spinning the ultra-thin amorphous ribbon of less than 30㎛ made of Fe-based amorphous ribbon, for example, Fe-Si-B-Cu-Nb alloy (RSP And a nanocrystalline ribbon sheet on which the nanocrystalline grains are formed by subjecting the amorphous ribbon sheets laminated so as to obtain a desired permeability to a magnetic field heat treatment for 30 minutes to 2 hours at a temperature range of 300 ° C to 700 ° C. S13).

In this case, the heat treatment atmosphere is more than 70at% of the Fe content, so if the heat treatment is performed in the air, the oxidation is not preferred in terms of visual, it is preferably made in a nitrogen atmosphere. However, even if the heat treatment is performed in an oxidizing atmosphere, the magnetic permeability of the sheet is not substantially different under the same temperature conditions.

In this case, if the heat treatment temperature is less than 300 ℃ nano-crystal grains are not sufficiently generated, the desired permeability is not obtained, the heat treatment time is long, there is a problem that the heat permeability is significantly lowered by overheating if it exceeds 700 ℃ there is a problem. If the heat treatment temperature is low, the treatment time is long, and conversely, if the heat treatment temperature is high, the treatment time is preferably shortened.

In addition, the amorphous ribbon of the present invention uses a thickness having a range of 15 ~ 35㎛, the permeability of the amorphous ribbon increases in proportion to the thickness of the ribbon.

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

Subsequently, as shown in FIGS. 2 and 3, the heat treated amorphous ribbon sheets 2a; 21-26 are used as one or multiple layers of desired layers, and the protective film 1 is attached to one side and the other side. The flake process is performed in the state which attached the double-sided tape 3; 3f with the release film 4 attached to it (S14).

The flake treatment is, for example, as shown in Figs. 8 and 9, a lamination sheet in which the protective film 1, the amorphous ribbon sheets 2a; 21-26, and the double-sided tape 3 and the release film 4 are sequentially laminated. By passing the 100 through the first and second flake devices 110 and 120, the amorphous ribbon sheets 2a; 21-26 are separated into a plurality of fine pieces 20. In this case, the separated plurality of fine pieces 20 are kept separated by the first and second adhesive layers 12 and 31 adhered to both sides.

The usable first flake device 110 is, for example, as shown in Figure 8, the metal roller 112 having a plurality of irregularities 116 is formed on the outer surface, and is disposed to face the metal roller 112 It may be composed of a rubber roller 114, the second flake device 120 is, as shown in Figure 9, a metal roller 122, a plurality of spherical ball 126 is mounted on the outer surface, the metal roller 122 It may be composed of a rubber roller 124 is disposed opposite to.

As such, when the laminated sheet 100 passes through the first and second flake devices 110 and 120, as shown in FIG. 10, the amorphous ribbon sheet 2a is divided into a plurality of fine pieces 20, and fine pieces. A gap 20a is generated between the 20's. 10 shows a flake treatment using one amorphous ribbon sheet 2a.

Since the plurality of fine pieces 20 of the amorphous ribbon sheet 2a are formed to have a size in the range of several tens of micrometers to 3mm, the magnetic field is increased to remove the hysteresis loss, thereby increasing the uniformity of the permeability to the sheet.

In addition, the amorphous ribbon sheet 2a may block the heat generation problem due to the eddy current generated by the alternating magnetic field as the surface area of the fine piece 20 is reduced by the flake treatment.

In the flake-laminated sheet 200, a gap 20a is present between the fine pieces 20, and when moisture penetrates into the gap 20a, the amorphous ribbon is oxidized so that the appearance of the amorphous ribbon becomes poor and shielding. The performance will drop.

In addition, when only the flake processing is performed, as the fine pieces 20 are in contact with each other according to the flow of the fine pieces 20, the size of the fine pieces 20 may increase, thereby increasing the eddy current loss.

In addition, the flake-treated laminated sheet 200 may cause a surface unevenness of the sheet during flake processing, it is necessary to stabilize the flake-treated ribbon.

Therefore, the flake-laminated sheet 200 performs a lamination process for flattening, slimming, and stabilizing at the same time filling the adhesive with the gap 20a between the fine pieces 20 (S15). As a result, while preventing moisture infiltration, the microflakes 20 can be separated from each other by enclosing all surfaces of the microflakes 20 with an adhesive to reduce eddy currents.

The laminate apparatus 400 and 500 for the lamination process is a second pressing roller 210 and the first pressing roller 210 passing through the flake-laminated sheet 200 as shown in FIG. The roll press type consisting of the pressure roller 220 may be applied, and as shown in FIG. 12, the upper pressurized to be vertically movable above the lower pressurizing member 240 and the lower pressurizing member 240. A hydraulic press type consisting of the member 250 can be used.

When the flake-laminated sheet 200 is heated to room temperature or 50 to 80 ° C. and then passed through the laminating devices 400 and 500, the first adhesive layer 12 of the protective film 1 is pressed while the first adhesive layer 12 is pressed. In addition to the some of the adhesive is introduced into the gap (20a) and the double-sided tape (3) is pressed, some of the adhesive of the second adhesive layer 31 is introduced into the gap (20a) between the fine pieces 20 to close the gap (20a) To seal.

Here, the first adhesive layer 12 and the second adhesive layer 31 may be an adhesive that can be deformed when pressed at room temperature, or a thermoplastic adhesive that is deformed by applying heat may be used.

In addition, the thicknesses of the first adhesive layer 12 and the second adhesive layer 31 preferably have a thickness of 50% or more relative to the thickness of the amorphous ribbon so as to sufficiently fill the gap 20a between the plurality of fine pieces.

In addition, the gap between the first pressing roller 210 and the second pressing roller 220 and the upper pressing member so that the adhesive of the first adhesive layer 12 and the second adhesive layer 31 can flow into the gap 20a. In the lowered state, an interval between the upper pressing member 250 and the lower pressing member 240 is preferably formed to be 50% or less of the thickness of the laminated sheet 200.

In addition, when the amorphous ribbon sheets 21-26 having the multilayer structure shown in FIG. 3 are used as the magnetic sheet 2, the first adhesive layer 12 of the protective film 1 and the second of the double-sided tape 3 are used. A part of the adhesive of the adhesive layer 31 and the adhesive of the adhesive layer or double-sided tape 3a-3e inserted between the laminated amorphous ribbon sheets 21-26 are filled with the gap 20a to separate the fine pieces 20. Let's do it.

In the present invention, any device can be used as long as the pressing and flake processing of the laminated sheets 100 and 200 can be performed.

When the lamination process is completed, the magnetic field shielding sheet 10 according to the present invention, as shown in FIG. 13, the thin magnetic sheet 2 using the amorphous ribbon sheet 2a is separated into a plurality of fine pieces 20. The first adhesive layer 12 and the second adhesive layer 31 partially fill the gaps 20a between the fine pieces 20 in a closed state to prevent oxidation and flow of the amorphous ribbon sheet 2a. do.

Finally, the magnetic field shielding sheet 10 made of the laminate is stamped into the size and shape necessary for the place and use for the electronic device is made into a commercialization (S16).

In the present invention, when laminating six amorphous ribbon sheets 21-26 as the thin magnetic sheet 2 as shown in FIG. 3, 212 μm including the protective film 1 and the release film 4 before lamination is performed. It has a thickness of, and when laminating is made slimmer to 200㎛.

In the above embodiment, one protective film 1 is attached to one side of the magnetic sheet 2 to flake and laminate treatment. However, damage to the protective film 1 may occur when the flake processing is performed. Therefore, preferably, another protective film for protecting the protective film 1 is attached to the upper portion of the protective film 1 to proceed with the treatment process, and after the treatment is completed, the surface protective film may be peeled off and removed.

(Humidity test)

The magnetic field shielding sheet 10 and the laminated sheet 200 which were not subjected to the lamination process after the flake treatment according to the present invention obtained above were subjected to a humidity test at a temperature of 85 ° C. and a humidity of 85% for 120 hours.

As a result, in the case of the flake-only laminated sheet 200 as shown in FIG. 14A, when the amorphous ribbon is separated into a plurality of fine pieces, moisture penetrates into the gaps between the pieces to oxidize the amorphous ribbon. It can be seen that the appearance has been changed, the magnetic shielding sheet 10 according to the present invention subjected to the lamination process can be seen that the appearance does not change as shown in Figure 14b.

Meanwhile, the magnetic shielding sheet according to the present invention may be constructed using the heterogeneous materials shown in FIGS. 15A and 15B.

As shown in FIG. 15A, the hybrid magnetic field shielding sheet 35 has a high magnetic permeability of the first magnetic sheet 35a and a low magnetic permeability second magnetic sheet 35b having a lower magnetic permeability than the first magnetic sheet 35a. It can be configured in a hybrid form by inserting the adhesive layer 35c in between. The adhesive layer 35c may be composed of a double-sided tape having an inorganic material adhesive layer or a base material.

As the first magnetic sheet 35a, a thin magnetic sheet 2 is formed by flake treating an amorphous ribbon sheet made of an amorphous alloy or a nanocrystalline alloy as in the first and second embodiments shown in FIGS. The shielding sheet (10-10b) used as can be applied.

The second magnetic sheet 35b may be a polymer sheet made of magnetic powder and resin having high magnetic permeability such as amorphous alloy powder, soft magnetic powder, and sendust.

In this case, the amorphous alloy powder has a composition selected from the group consisting of, for example, Fe-Si-B, Fe-Si-B-Cu-Nb, Fe-Zr-B, and Co-Fe-Si-B and is amorphous. It is preferable to use an amorphous alloy powder containing at least one alloy.

In addition, when the NFC and the wireless charging function is simultaneously employed in the portable terminal, the hybrid magnetic field shielding sheet 35 is composed of the first and second magnetic sheets 35a and 35b bonded by the adhesive layer 35c. In this case, the first magnetic sheet 35a applies the magnetic shielding sheet 10-10b of the first and second embodiments using an amorphous ribbon sheet, and applies a ferrite sheet with low frequency dependency as the second magnetic sheet 35b. By laminating and using the first and second magnetic sheets 35a and 35b, a second magnetic sheet 35b using a ferrite sheet is used for shielding NFC magnetic fields, and an amorphous ribbon sheet is used for wireless charging. It is also possible to optimize using the first magnetic sheet 35a.

In this case, the ferrite sheet used as the second magnetic sheet 35b is made of divided ferrite divided into a plurality of pieces, and the upper / lower and side surfaces of each divided ferrite are preferably surrounded by an insulator such as an adhesive layer.

Furthermore, when the NFC and the wireless charging function are simultaneously employed in the portable terminal, the hybrid magnetic field shielding sheet 35 has an amorphous ribbon sheet having a predetermined area in the center as the first magnetic sheet 35a, as shown in FIG. 15B. It is also possible to use the shielding sheet 10-10b used, and combine the annular second magnetic sheet 35b surrounding the first magnetic sheet 35a as a whole with the ferrite sheet outside the first magnetic sheet 35a. It is possible. That is, the second magnetic sheet 35b (ie, ferrite sheet) having a relatively low permeability relative to the first magnetic sheet 35a (ie, the amorphous ribbon sheet) is formed in a loop shape to form the first magnetic sheet 35a ( (Amorphous ribbon sheet).

On the other hand, Figure 16 shows a magnetic sheet and electromagnetic shielding composite sheet according to a fourth embodiment of the present invention.

The magnetic sheet and the electromagnetic shielding composite sheet 10d of the fourth embodiment are electromagnetic shielding and heat radiation on the upper surface of the protective film 1 or the lower surface of the double-sided tape 3 of the magnetic shielding sheet 10 according to the first embodiment. In order to have a function, the conductive sheet 5 made of Cu or Al foil having excellent conductivity and thermal conductivity is bonded to each other using a double-sided tape or an adhesive. FIG. 16 shows that the conductor sheet 5 is formed on the protective film 1 of the magnetic field shielding sheet 10.

As the adhesive, it is preferable to use an acrylic adhesive having a thermal conductivity function. The acrylic adhesive is an adhesive capable of room temperature curing.

The adhesive may contain 10 to 30 volume% of Ag and Ni powders based on the total volume% of the adhesive. Ag and Ni powder are conductive metals, which provide thermal conductivity to the adhesive layer, thereby improving heat dissipation.

Ag and Ni powders are difficult to exert a heat conduction function when the sum is less than 10 vol%, and when the volume exceeds 30 vol%, the adhesiveness of the adhesive is lowered.

In addition, the adhesive further includes a binder, an additive, and a curing agent to increase adhesion. The binder may be epoxy, and the additive may include a diluent and a dispersant.

The conductor sheet 5 attached to the magnetic field shielding sheet 10 is suitably made of 5 to 100 µm, preferably 10 to 20 µm thick. (The thickness of the copper heat dissipation layer is 10 µm or less.)

The magnetic sheet and electromagnetic shielding composite sheet 10d of the fourth embodiment has the opposite side where the conductor sheet 5 is attached to the double-sided tape 3 and the conductor sheet 5 is not attached, that is, the upper portion of the protective film 1. NFC antenna 6 or dual antenna 40 for NFC and wireless charging are welded to each other through a double-sided tape (bonding sheet), and additional processes such as a hot press process are further performed after attaching coverlays to both sides thereof. It is preferable.

In addition, the thin film metal layer of Cu, Ni, Ag, Al, Au, Sn, Zn, Mn, Mg, Cr, Tw, Ti or a combination of these metals may be sputtered or vacuum deposited instead of the foil-shaped conductor sheet 5 ( Formed on the upper surface of the protective film 1 of the magnetic shielding sheet 10 or the lower surface of the double-sided tape 3 by any one of vacuum evaporation, chemical vapor deposition, and electroplating. Can be.

When the metal layer is made of Cu, the method may further include depositing a seed layer made of Ti—Cu by a sputtering method in order to increase the bonding force of the Cu metal layer. The thickness of the Cu metal layer may be set to 10 μm or more, and the thickness of the seed layer made of Ti—Cu may be set to 0.5 μm.

The composite sheet 10d having the magnetic field and the electromagnetic shielding and heat dissipation function, for example, prevents an increase in the frequency fluctuation when the NFC antenna is mounted in the battery pack when electromagnetic waves such as power supply noise are severely generated. It is reduced, and has a heat dissipation function by heat dissipation when the portable terminal device body or the battery generates heat.

In this case, the composite sheet 10d of the fourth embodiment is used by being attached through the double-sided tape to the back of the battery cover so that the conductor sheet 5 is exposed toward the battery.

On the other hand, the magnetic field shielding sheet 10-10c according to the first to third embodiments of the present invention is a thin magnetic sheet 2 as a single or multiple ribbon sheets (21-26) by stacking and flake finely The gap 20a formed between the 20 may have an air trap structure capable of trapping air by holding the gap 20a as shown in FIG. 10 under the control of the pressing force during the laminating process. .

That is, the thin magnetic sheet 2 has a protective film 1 and a double-sided tape 3 is attached to both sides, the adhesive layer or double-sided tape (3a-3e) between a plurality of laminated ribbon sheets (21-26) Since the gaps 20a formed between the fine pieces 20 are inserted, they form closed micropores capable of trapping air.

The air trapped in the closed micropores does not escape by itself, that is, convection is suppressed to capture heat conducted from the heat generating source serves to suppress heat transfer. In this case, the air trapped in the micropores is known to have a low thermal conductivity of 0.025W / mK, so that the magnetic field shielding sheet (10-10b) has an excellent heat insulating action with respect to the Z direction perpendicular to the plane of the sheet Can serve as

In addition, the magnetic sheet and the electromagnetic shielding composite sheet 10d according to the fourth embodiment is a thermal diffusion sheet for rapidly diffusing heat conducted by the conductor sheet 5 made of Cu or Al foil having excellent thermal conductivity in the XY direction. It can act as a (Heat Spread Sheet).

In general, when a heating element is provided in a closed space, such as a portable terminal device, such as a plurality of integrated circuits (ICs) for signal processing apparatus, the thermal diffusion sheet diffuses the temperature of the heating element as quickly as possible to prevent the temperature from rising locally. It is necessary to block or delay the transfer of heat to the user through the front display or the back cover by the insulation sheet.

For example, the wireless charging receiver rectifies the high-frequency wireless power signal received from the secondary coil, that is, the wireless charging antenna coil 43 into DC, and then converts the voltage to DC- for converting the voltage level required for storing in the battery. It may be provided with a signal processing processor used for the control to increase the reception efficiency of the DC converter or the wireless power signal.

Therefore, when the magnetic field and electromagnetic wave shielding composite sheet 10d according to the fourth embodiment is used as a magnetic shielding sheet for wireless charging, for example, when the active element for signal processing is mounted on an extended portion thereof, The conductor sheet 5 diffuses heat generated from the active element in the horizontal direction, and the magnetic shielding sheet 10 blocks or delays heat transfer in the Z direction, that is, insulates it and delivers it to the user who grips it through the rear cover. Can lower the heat.

The composite sheet of the present invention has a conductive layer having electromagnetic shielding and heat dissipation functions on one side, and at the same time serves as a heat shielding layer capable of collecting heat by a plurality of micropores provided in the shielding sheet, magnetic fields, electromagnetic waves Both shielding, heat dissipation and thermal insulation can be performed.

Meanwhile, a structure in which the magnetic shielding sheet according to the present invention is attached to the NFC antenna module and the portable terminal applied to the NFC antenna will be described below with reference to FIGS. 17 and 18.

17 is an exploded perspective view illustrating a coupling relationship between a magnetic shielding sheet and an NFC antenna according to the present invention, and FIG. 18 is an exploded perspective view illustrating that the NFC antenna module of FIG. 17 is assembled to a battery cover and coupled to a portable terminal.

Referring to FIG. 17, when the magnetic shielding sheet according to the present invention is applied to an NFC antenna, the NFC antenna 6 is attached to the upper portion of the protective film 1 of the magnetic shielding sheet 10 by using a double-sided tape 30b. The lower part of the magnetic field shielding sheet 10 removes the release film 4 and attaches the finishing material to the third adhesive layer 33 of the exposed double-sided tape 3.

In addition, instead of the antenna assembly method, it is also possible to remove the release film 4 of the magnetic shielding sheet 10 and attach the NFC antenna 6 to the double-sided tape 3.

NFC antenna module 103 assembled with the NFC antenna 6 and the magnetic shielding sheet 10 is a portable terminal device 101 using a double-sided tape (30a) on the surface of the NFC antenna 6 as shown in FIG. To the battery cover 15. Thereafter, when the battery cover 15 is coupled to the portable terminal device 101, the magnetic field shielding sheet 10 is used to cover the battery 7.

The magnetic field shielding sheet 10 may be assembled by other well-known methods other than being disposed outside the battery.

In addition, when the portable terminal device 101 uses the rear cover instead of the battery cover in the main body, the NFC antenna module 103 may be disposed inside the rear cover.

In addition, the NFC antenna module 103 may be assembled with the NFC antenna 6 and the magnetic shielding sheet 10a-10d of the second to fourth embodiments in addition to the magnetic shielding sheet 10 of the first embodiment.

Referring to FIG. 17, the NFC antenna 6 may have any well-known structure. NFC antenna 6 is, for example, NFC antenna coil 6a made of any one of a spiral, square, round, oval shape on a flexible printed circuit board (FPCB) 6b made of a synthetic resin such as polyimide (PI) It may be configured as. The NFC antenna coil 6a patterns a conductor such as a copper foil attached to the flexible printed circuit board (FPCB) 6b in the form of a loop so that an induced current flows due to an external magnetic field change, or uses a conductive ink to form a flexible printed circuit board ( Loop-shaped metal patterns can be formed in the FPCB) 6b.

The NFC antenna 6 has a pair of terminal terminals 6c and 6d respectively disposed at the protrusions of the flexible printed circuit boards (FPCBs) 6b formed on one side of the NFC antenna coil 6a.

The outer line of the NFC antenna coil 6a is directly connected to the first terminal terminal 6c, and the inner line is a terminal connection pattern formed on the rear surface of the substrate 6b through conductive through holes 6e and 6f (not shown). Is connected to the second terminal terminal 6d.

In addition, the NFC antenna 6 is attached to the magnetic shielding sheet 10 using the double-sided tape (30b), one adhesive sheet that serves as an insulating layer instead of the NFC antenna 6 and the double-sided tape (30b), For example, the NFC antenna coil 6a may be directly formed on the double-sided tape to be assembled into a thin film structure. As a result, the flexible printed circuit board (FPCB) 6b on which the NFC antenna coil 6a is formed can be removed, and the thickness can be reduced.

As described above, when the NFC antenna module 103, which is an assembly of the NFC antenna 6 and the magnetic shielding sheet 10, is provided in the battery cover 15 of the portable terminal device 101, the NFC function is not contacted to the portable terminal device ( It is possible to block the influence on the portable terminal device 101 by the alternating magnetic field generated when implemented in a wireless) manner and absorb the electromagnetic waves required to perform the NFC function.

That is, the magnetic field shielding sheet 10 of the present invention has a multi-layered magnetic sheet 2, which is flake-processed and separated into a plurality of fine pieces 20, whereby the Q value is increased to increase the high frequency signal transmission and power transmission efficiency. As a result, the surface area of the sheet is reduced by the flake treatment, thereby preventing the heat generation problem of the battery (secondary cell) 7 due to the eddy current generated by the alternating magnetic field.

19 is a plan view illustrating a dual antenna structure in which a near field communications (NFC) antenna and a wireless charging antenna are integrally formed using an FPCB.

Dual antenna 40 for simultaneously performing the NFC and wireless charging function is preferably implemented using an FPCB having a double-sided substrate structure. However, the dual antenna of the present invention is not limited thereto and may have a structure of another type.

Referring to FIG. 19, the dual antenna 40 includes, for example, an NFC antenna coil 41 and a wireless charging secondary coil 43 on a substrate 49 using an FPCB. In this case, for example, the substrate 49 may use a double-sided adhesive tape, and the NFC antenna coil 41 and the wireless charging secondary coil 43 may be formed on the adhesive substrate using a transfer method. .

Since the NFC antenna coil 41 has a higher frequency band than the secondary coil 43 for wireless charging, the NFC antenna coil 41 is formed in a conductive pattern in a rectangular shape having a fine line width along the periphery of the substrate 49, and the secondary coil for wireless charging ( 43) is required to transmit power and uses a lower frequency band than NFC, so that the line width is wider than the line width of the NFC antenna coil 41 inside the NFC antenna coil 41, and is formed in a substantially elliptic conductive pattern. The NFC antenna coil 41 and the secondary charging coil 43 for wireless charging are formed by patterning the copper foil attached to the substrate 49 by etching. Inductance values of the NFC antenna coil 41 and the wireless charging secondary coil 43 serve as the NFC antenna and the wireless charging antenna.

In this case, since the secondary coil 43 for wireless charging is to receive power wirelessly, it is also possible to use a common coil by winding it in the form of a flat inductor and attaching it to a substrate.

The dual antenna 40 has a pair of terminal terminals 41a and 41b and 43a and 43b, respectively, on the protrusions of the substrate 49 formed on one side of the NFC antenna coil 41 and the wireless charging secondary coil 43. Is arranged.

The outer line of the NFC antenna coil 41 is directly connected to the first terminal terminal 41a, and the inner line is a terminal connection pattern formed on the rear surface of the substrate 49 through conductive through holes 45a and 45b (not shown). Is connected to the second terminal 41b).

Similarly, the outer line of the secondary coil 43 for wireless charging is connected to the third terminal terminal 43a through a terminal connection pattern (not shown) formed on the back surface of the substrate 49 through the conductive through holes 47a and 47b. ), And the inner line is connected to the fourth terminal terminal 43b through a terminal connection pattern (not shown) formed on the rear surface of the substrate 49 through the conductive through holes 47c and 47d.

The substrate 49 may have a protective film formed on a surface thereof, for example, to protect an antenna coil pattern such as a photo solder resist (PSR).

In the case of simultaneously employing the NFC and the wireless charging function, as described above, the shielding sheet employing the hybrid magnetic sheet of Figs. 15A and 15B can be used.

On the other hand, the portable terminal device 101 includes a rectifier (not shown) for rectifying the AC voltage generated in the secondary coil 43 for wireless charging into a DC inside the main body, and the rectified DC voltage is a battery (secondary battery). 7).

When the dual antenna 40 illustrated in FIG. 19 is applied to the portable terminal device 101 in combination with the magnetic field shielding sheet 10-10d, the NFC antenna coil 41 and the secondary charging coil 43 for wireless charging may be used. At the same time, NFC and wireless charging can be solved together, and the NFC function blocks the effect on the mobile terminal device 101 by the alternating magnetic field generated when the NFC and wireless charging functions are implemented in a non-contact (wireless) manner. It can absorb the electromagnetic waves needed to

Meanwhile, in the above-described embodiment, the NFC antenna coil 41 and the wireless charging secondary coil 43 constituting the dual antenna are exemplified in a structure in which both sides of the substrate are disposed, but the NFC is formed on one side of the substrate. The antenna coil 41 is arrange | positioned, and it is also possible to comprise so that the secondary coil 43 for a wireless charging may be arrange | positioned on the other side.

20A and 20B are a plan view and an equivalent circuit diagram showing a structure in which an integrated antenna for NFC and wireless charging is implemented using one coil in one FPCB according to the present invention, respectively.

The integrated antenna 50 for both NFC and wireless charging, as shown in Figure 20a, is composed of a coil unit 51 formed in a spiral along the outer periphery of the substrate on the rectangular substrate 59, the coil unit Three terminal terminals are connected to 51.

The coil unit 51 may be formed by, for example, patterning a copper foil formed on an FPCB substrate, and an outer line of the coil unit 51 is directly connected to the first terminal terminal 53, and an inner line is conductive through. It is connected to the second terminal terminal 55 through a terminal connection pattern (not shown) formed on the back of the hole and the substrate 59, and is located at a predetermined position between the first and second terminal terminals 53 and 55. A lead wire branched out from the coil part 51 is connected to the third terminal terminal 54 through a conductive connection hole and a terminal connection pattern (not shown) formed on the back surface of the substrate 59.

The NFC and the wireless charging combined antenna are relatively similar to the equivalent circuit diagram shown in FIG. 20B, because the entire coil unit 51 between the first terminal terminal 53 and the second terminal terminal 55 has a large inductance value. An inductance value is set to serve as a wireless charging antenna in which low-frequency wireless power communication is performed, and the first coil part 51a or the second terminal terminal between the first terminal terminal 53 and the third terminal terminal 54. Since the second coil part 51b between the 55 and the third terminal terminal 54 has a small inductance value, the inductance value is set to serve as an NFC antenna for relatively high frequency NFC communication.

That is, the length of the entire coil unit 51 is set to have an inductance value suitable for the wireless charging antenna, and the third terminal terminal 54 has the inductance of the first coil unit 51a or the second coil unit 51b. The branch position of the third terminal terminal 54 is set so that the value serves as an antenna for NFC.

As a result, the NFC and the wireless dual-use antenna receives the wireless charging signal according to the wireless power communication from the first terminal terminal 53 and the second terminal terminal 55, the first terminal terminal 53 and the third terminal terminal The NFC communication is performed by receiving the NFC radio signal from the 54 or the second terminal 55 and the third terminal 54.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following examples are merely examples of the present invention, and the scope of the present invention is not limited thereto.

(Example 1-4, Comparative Example 1-3)

(Electrical characteristics of magnetic shielding sheet)

When a magnetic shielding sheet was not used (Comparative Example 1), a magnetic shielding sheet using one non-heat treated amorphous ribbon sheet (Comparative Example 2), and a magnetic shielding sheet using a heat treated one nanocrystalline ribbon sheet (Comparative Example 3) ), Using a heat treated one nanocrystalline ribbon sheet, flake-treated magnetic shielding sheet (Example 1), using a heat treated two nanocrystalline ribbon sheet, a flake-treated magnetic shielding sheet (Example 2), Using three heat-treated nanocrystalline ribbon sheets, a flake-treated magnetic shielding sheet (Example 3), using a heat-treated four nanocrystalline ribbon sheets, to prepare a flake-treated magnetic shielding sheet (Example 4), respectively It was.

The amorphous ribbon applied to the shielding sheet was prepared by forming an amorphous ribbon made of Fe _73.5 Cu ₁ Nb ₃ Si _13.5 B ₉ alloy to a thickness of 25 μm by quenching and solidification (RSP) by melt spinning, and cutting the sheet into 580 ° C., N. ₂ Amorphous ribbon sheet obtained by atmosphere-free heat treatment for 1 hour is inserted between a 10 탆 thick protective film using a PET substrate and a 10 탆 thick double-sided tape (excluding a release film) using a PET substrate, and the laminated sheet is Then, the flake and the lamination process were performed using the flake processing apparatus of FIG. 8 and the lamination apparatus of FIG. When stacking two or more nanocrystalline ribbon sheets, the double-sided tape inserted between the sheets was formed with an acrylic adhesive layer on both sides of the PET film and used to have a thickness of 12 μm.

In order to investigate the effect of the fabricated shielding sheet on the secondary coil, a circular flat coil having a inductance of 12.2μH and a resistance of 237mΩ was used as the secondary coil, that is, the measurement coil, coupled to the shielding sheet. . After connecting the measurement coil to the LCR meter, place the rectangular parallelepiped weighing about 500g on the shielding coil and set the LCR meter to 100kHz and 1V under constant pressure. ), Magnetoresistance (Rs), impedance (Z), and the quality factor (Q) of the coil were measured and shown in Table 1 below.

Table 1

Used ribbon	Ribbon number	Ls (μH)	Rs (mΩ)	Z	Q
Comparative Example 1 (No Sheet)	0	12.08	245	7.59	30.9
Comparative Example 2 (non-heat treated ribbon)	1 EA	17.91	1020	11.3	11.03
Comparative Example 3 (Heat Treated Ribbon)	1 EA	21.74	605	13.67	22.53
Example 1 (heat treatment and flake treatment)	1 EA	21.52	442	13.52	30.5
Example 2 (heat treatment and flake treatment)	2 EA	21.54	355	13.54	38
Example 3 (heat treatment and flake treatment)	3 EA	21.56	327	13.55	41.4
Example 4 (heat treatment and flake treatment)	4 EA	21.7	308	13.64	44.2

As can be seen from Table 1, in the case of the shielding sheet (Comparative Example 2) using a ribbon that is not heat-treated, the magnetic permeability is low, the inductance (Ls) value of the secondary coil is small, the electrical resistance of the ribbon is low The resistance (Rs) value is large, and the Q value, which is a quality factor of the coil, is significantly lower.

In the case of the shielding sheet using the ribbon sheet subjected to heat treatment (Comparative Example 3), the permeability is increased to increase the inductance (Ls) value of the secondary coil, and the electrical conductivity of the ribbon sheet is obtained through the nano-grain microstructure generated in the ribbon sheet by heat treatment. As the resistance increased, the magnetoresistance (Rs) value was significantly lower than before the heat treatment, and as a result, the coil's quality factor (Q) value was found to be significantly higher than before the heat treatment.

In addition, in the case of the shielding sheet (Example 1) in which the ribbon sheet is flaked while using the ribbon sheet subjected to heat treatment, the inductance (Ls) value of the secondary coil is not significantly changed, and the magnetoresistance (Rs) value is Is much lower than without flake treatment, and the Q value of the overall coil is further increased.

In addition, the higher the laminated number of the ribbon sheet compared to Example 1, the higher the quality factor (Q) value of the coil was found to increase significantly.

As described above, when the shielding sheet according to the present invention is used in the wireless charger, the inductance (Ls) and Q value of the secondary coil increases, and the magnetoresistance (Rs) value decreases as the transmission to the secondary coil of the wireless charger. It is possible to increase the transmission efficiency of the magnetic flux transmitted from the device.

(Example 5-8, Comparative Example 1)

(Power transmission efficiency of magnetic shielding sheet)

Magnetic field shielding sheet of Examples 5 to 7 was prepared in the same manner as in Examples 1 to 4, and the number of nanocrystalline ribbon sheets laminated only on the sheet was changed to 6 sheets, 9 sheets, and 12 sheets. The magnetic field shielding sheet of 8 differs in that the shape of the magnetic field shielding sheet (number of nanocrystalline ribbon sheets: 6 sheets) of Example 6 is processed into the same annular shape as that of the secondary coil.

Comparative Example 1 (when no magnetic shielding sheet was used) and the magnetic shielding sheets of Examples 5 to 8, respectively, as shown in FIG. 19, a 0.5 mm thick sheet of paper was placed on top of the transmitter 8 of the wireless charger. (9), and applied to the primary coil of the transmitter (Tx) 8 with the receiver on which the magnetic shielding sheet 10 and the secondary coil 6 assembled on the lithium ion battery 7 mounted. The voltage (V) and the current (mA), and the voltage (V) and current (mA) received by the secondary coil 6 of the receiver Rx are measured and described in Table 2 below, based on which the power transmission is performed. The efficiency was calculated.

TABLE 2

Used ribbon	Tx		Rx		efficiency(%)
	V	mA	V	mA
Comparative Example 1 (No Sheet)	19	188	4.87	520	70.895857
Example 5 (six square ribbons)	19	205	4.87	521	65.141720
Example 6 (nine pieces of square ribbons)	19	194	4.87	521	68.835323
Example 7 (12 square ribbons)	19	190	4.87	521	70.284488
Example 8 (six pieces of coil shape ribbons)	19	192	4.87	521	69.552357

Conventionally, when a permanent magnet is included in a transmitter of a wireless charger, a shielding sheet using a ferrite sheet should be 0.5 T or more due to the DC magnetic field caused by the permanent magnet, thereby enabling optimal wireless charging operation as the shielding sheet.

Referring to Table 2, as in Examples 5 to 7, when the shielding sheet, that is, the shape of the nano-crystal ribbon sheet is made of a square, the power transmission efficiency almost the same as the receiver of Comparative Example 1 does not use any shielding sheet It can be seen that in order to have a nano-grain ribbon sheet should be laminated about 12 sheets.

In addition, in the case of using the 12 nanocrystalline ribbon sheet as in Example 7 of the present invention, the magnetic permeability is high, even when the shielding sheet using a conventional ferrite sheet, even within 0.3 T lower than 0.5 T characteristics equivalent to the ferrite or polymer sheet Indicates.

Furthermore, as in Example 8, when the shape of the magnetic field shielding sheet (number of nanocrystalline ribbon sheets: 6 sheets) was produced in the same annular shape as that of the secondary coil, the number of nanocrystalline ribbon sheets used was Example 7 (nanocrystalline grains). Although the number of ribbon sheets: 12 sheets) is 1/2, it can be seen that the power transmission efficiency is almost equivalent to that of the seventh embodiment.

As a result, when the shape of the magnetic shielding sheet was formed in the same annular shape as that of the secondary coil as in Example 8, the number of nanocrystalline ribbon sheets to be used can be reduced to 1/2, so that the manufacturing cost was reduced and the product thickness was reduced. It becomes possible to slim down further.

This result shows almost the same result even when the shape of the secondary coil of the receiving device and the corresponding shape of the magnetic shielding sheet are changed to other shapes.

(Temperature characteristic)

The magnetic field shielding sheet according to Example 8 was set as shown in FIG. 19, and the charging time was measured in 30 minutes from 30 minutes to 4 hours 30 minutes, and the temperature of the nanocrystalline ribbon sheet of the battery and the magnetic field shielding sheet was measured. It is shown in Table 3 below.

TABLE 3

Charging operation time	Battery temperature (℃)	Ribbon sheet temperature (℃)
0.5 hours	29.5	30
1.0 hours	30	30
1.5 hours	30.5	30.5
2.0 hours	30.5	30.5
2.5 hours	30.5	31
3.0 hours	30.5	31
3.5 hours	30.5	31
4.0 hours	30.5	31
4.5 hours	30.5	31

In general, when a wireless charging is performed, a secondary battery such as a lithium ion battery 7 may have a safety problem when it exceeds 40 ° C. or more.

When applying the shielding sheet of the present invention to the wireless charger, as shown in Table 3, the temperature of the battery and the shielding sheet does not rise even as time passes, it is found that the temperature is maintained at around 30 ° C to ensure safety Can be.

(Example 9)

Amorphous ribbons made of Fe ₆₇ B ₁₄ Si ₁ Co ₁₈ alloy were manufactured to have a thickness of 25 μm by quenching and solidification (RSP) by melt spinning, and then cut into sheets to be cut at 487 ° C., 459 ° C., and 450 ° C. for 1 hour. An amorphous ribbon sheet obtained by long heat treatment was obtained. Thereafter, the amorphous ribbon sheet obtained by heat treatment was inserted between a 10 μm thick protective film using a PET substrate and a 10 μm thick double-sided tape using a PET substrate (separate release film) to prepare a laminated sheet, and FIG. 8. The flake and the lamination process were performed using the flake processing apparatus of and the lamination apparatus of FIG.

At this time, the number of amorphous ribbon sheets used in the laminated sheet was used 1 to 9 sheets for each heat treatment temperature, and double-sided tape was inserted between the amorphous ribbon sheets, and the inductance (permeability) and the heat treatment temperature of each amorphous ribbon sheet were measured. The charging efficiency is measured and shown in Table 4 below.

Table 4

Inductance (permeability)	Charge efficiency (%)
	1 page	Chapter Two	Chapter three	Chapter four	Chapter five	Chapter 6	Chapter seven	Chapter eight	Chapter nine
13 μH	56	61	65.6	65.8	67.1	68.4	68.9	69.1	Operation
15 μH	59.2	65.8	68	68.4	68.6	69.1	69.1	69.3	68.9
18 μH	57	63.6	66.3	68	68.2	68.9	69.1	69.1	68.9

The amorphous ribbon sheet was subjected to magnetic field heat treatment at 487 ° C, 459 ° C, and 450 ° C for 1 hour, respectively. As a result, the inductance (permeability) of each sheet was reduced to 13 μH, 15 μH, and 18 μH with increasing heat treatment temperature.

The filling efficiency for each inductance of each sheet was the highest when the inductance (permeability) heat-treated at 459 ° C was 15 μH, and the charging efficiency was proportional to each other as the number of amorphous ribbon sheets laminated increased from 1 to 8 sheets. It showed a tendency to increase, and when the four sheets were stacked, the saturation phenomenon was shown, and when more than eight sheets, the charging efficiency tended to decrease.

(Example 10)

The inductance (permeability) was measured using the amorphous ribbon sheet having a thickness of 15 μH, and the maximum filling efficiency for each layer of the sheet was measured, and the results are shown in Table 5 below.

The maximum charging efficiency is a value obtained by adjusting the time constant value of the receiver based on the inductance value of the receiver of the wireless charger, that is, the secondary coil, to adjust the efficiency to the maximum value.

Table 5

Permeability	Max Charging Efficiency (%)
	1 page	Chapter Two	Chapter three	Chapter four
15 μH	61.3	68.7	71.1	71.9

Referring to Table 5, the efficiency increased with the number of amorphous ribbon sheets stacked, and the maximum filling efficiency was the highest at 71.9% when 4 sheets were stacked.

As described above, in the present invention, the loss caused by the eddy current is greatly reduced by the flake processing of the amorphous ribbon, thereby preventing the magnetic field effects on the main body and the battery of the portable terminal device and the like, and The power transmission efficiency is excellent by increasing the quality factor (Q).

In addition, in the present invention, the gap between the fine pieces of the amorphous ribbon is filled by the adhesive lamination treatment after the flake treatment of the amorphous ribbon to prevent moisture penetration and at the same time, all surfaces of the fine pieces are surrounded by the adhesive (dielectric). It is possible to prevent the deterioration of the shielding performance by reducing the eddy current by insulating fine pieces from each other.

In the above-described embodiment, the wireless charger is applied to the portable terminal, but the present invention can be applied to all portable electronic devices that provide a wireless charging function in a non-contact (wireless) manner.

In the above description of the embodiment has been described by illustrating that the magnetic field shielding sheet is applied to both NFC and wireless charging, it is also possible to use NFC or wireless charging alone. In addition, it is also possible to apply a magnetic field and electromagnetic shielding composite sheet in addition to the magnetic shielding sheet for NFC and wireless charging.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments, and the present invention is not limited to the spirit of the present invention. Various changes and modifications will be possible by those who have the same.

The present invention is applied to a variety of portable electronic devices including a portable terminal to block the influence on the portable terminal device by the alternating current and direct current magnetic field generated when implementing NFC and wireless charging in a non-contact (wireless) method, NFC and wireless charging It can be applied to the composite sheet for magnetic field and electromagnetic shielding to help absorb the required electromagnetic waves.

Claims (16)

1. A magnetic sheet having an amorphous ribbon sheet heat-treated and flakes separated into a plurality of fine pieces, a protective film adhered to one side of the amorphous ribbon sheet, and an adhesive tape adhered to the other side of the amorphous ribbon sheet; And

   Magnetic sheet and electromagnetic shielding composite sheet comprising a; electromagnetic shielding and heat dissipation conductor sheet laminated on the magnetic sheet.
2. The method of claim 1,

   The gap between the plurality of fine pieces of the magnetic sheet is a composite sheet for shielding magnetic fields and electromagnetic waves is filled with a portion of the adhesive of the protective film and the adhesive tape.
3. The composite sheet for magnetic field and electromagnetic shielding according to claim 1, wherein a plurality of the magnetic sheets are stacked.
4. The method of claim 1,

   The conductive sheet is bonded to the magnetic sheet by an acrylic adhesive or double-sided tape, the acrylic adhesive is a magnetic sheet and electromagnetic shielding composite sheet containing 10 to 30volume% Ag or Ni powder.
5. The composite sheet for magnetic field and electromagnetic shielding according to claim 1, wherein the conductor sheet is made of a metal thin film or a metal film formed by vacuum deposition or electroplating.
6. A first magnetic sheet of first permeability; And

   It includes a second magnetic sheet laminated on the first magnetic sheet having a second magnetic permeability lower than the magnetic permeability of the first magnetic sheet,

   The first magnetic sheet is separated into a plurality of fine pieces and the plurality of fine pieces are disposed on the same plane, the protective film and the double-sided tape is laminated on both sides,

   The gap between the plurality of fine pieces is a magnetic sheet and electromagnetic shielding composite sheet is filled with a portion of the adhesive layer included in the protective film and the double-sided tape.
7. The method of claim 6,

   The first magnetic sheet uses an amorphous ribbon sheet,

   The second magnetic sheet is a magnetic sheet and electromagnetic shielding composite sheet using a polymer sheet made of magnetic powder and resin.
8. The method of claim 6,

   The first magnetic sheet is composed of an amorphous ribbon sheet, the second magnetic sheet is a magnetic sheet and electromagnetic shielding composite sheet made of a ferrite sheet.
9. The method of claim 8,

   The first magnetic sheet is disposed in a central area in a predetermined area,

   The second magnetic sheet is a composite sheet for shielding magnetic fields and electromagnetic waves consisting of an annular enclosing the first magnetic sheet.
10. The method of claim 6,

    The composite sheet for magnetic field and electromagnetic shielding further comprises a conductive sheet formed of a conductive metal thin film on the outer surface of the first magnetic sheet having an electromagnetic shielding and heat radiation.
11. The method of claim 6,

    The shielding sheet is applied to the receiver of the wireless charger,

    The magnetic sheet is a Fe-based amorphous alloy having a magnetic field heat treatment for 30 minutes to 2 hours at a temperature of 300 ℃ to 600 ℃ or a nano-crystalline alloy heat treated for 30 minutes to 2 hours at a temperature of 300 ℃ to 700 ℃ Composite sheet for shielding magnetic fields and electromagnetic waves.
12. NFC antenna is made in the form of a loop on the substrate for transmitting and receiving NFC (Near Field Communication) signal; And

    The antenna module laminated on the substrate, comprising a composite sheet for shielding the magnetic field and electromagnetic waves according to any one of claims 1 to 11.
13. It is formed in a loop form on the inside of the substrate and is formed in a loop form on the outside of the substrate and a wireless charging secondary coil for receiving a wireless charging high frequency power signal transmitted from a transmitter of a wireless charger and transmits and receives a high frequency signal for NFC. Dual antenna having an NFC antenna coil for; And

    The antenna module stacked on the substrate, comprising a composite sheet for shielding the magnetic field and electromagnetic waves according to any one of claims 1 to 11.
14. The method of claim 13,

    The composite sheet is extended, the antenna module is mounted with a DC-DC converter circuit for converting the high-frequency power signal received in the extended area to a direct current, and then required for the DC level conversion.
15. The method of claim 13,

    The composite sheet is an antenna module using an amorphous ribbon sheet of 1 to 12 layers.
16. Comprising one coil portion formed in a spiral pattern on the surface of the substrate and the first to third terminal terminals extending therefrom, and transmits and receives a high frequency signal for NFC between the first terminal terminal and the second terminal terminal, the third NFC and wireless charging combined antenna for receiving a high frequency signal for wireless charging transmitted from the transmitter of the wireless charger from between the terminal terminal and the first or second terminal terminal; And

    The antenna module laminated on the substrate, comprising a composite sheet for shielding the magnetic field and electromagnetic waves according to any one of claims 1 to 11.

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