WO2014137151A1 - 자기장 및 전자파 차폐용 복합시트 및 이를 구비하는 안테나 모듈 - Google Patents
자기장 및 전자파 차폐용 복합시트 및 이를 구비하는 안테나 모듈 Download PDFInfo
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- WO2014137151A1 WO2014137151A1 PCT/KR2014/001795 KR2014001795W WO2014137151A1 WO 2014137151 A1 WO2014137151 A1 WO 2014137151A1 KR 2014001795 W KR2014001795 W KR 2014001795W WO 2014137151 A1 WO2014137151 A1 WO 2014137151A1
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- sheet
- magnetic
- shielding
- nfc
- magnetic field
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/526—Electromagnetic shields
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/04—Screened antennas
Definitions
- 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.
- RFID Radio Frequency Identification
- NFC Near Field Communication
- Wireless Charger Wireless Charger
- Interactive Pen Tablet etc.
- 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.
- 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.
- NFC near field communication
- a radio frequency identification (RFID) wireless environment is widely used.
- RFID radio frequency identification
- NFC Near Field Communication
- a contactless smart card such as a USIM (Universal Subscriber Identity Module) card
- USIM Universal Subscriber Identity Module
- 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.
- a built-in function such as an electronic money function (e.g., an electronic money function) is realized.
- a contactless (wireless) charging antenna is installed in the battery cover of the portable terminal device.
- 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.
- 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.
- 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.
- 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.
- 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.
- NFC near field communication
- 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.
- a magnetic shielding sheet is essentially used.
- 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.
- 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 ⁇ H.
- 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.
- 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.
- the portable terminal device is provided with a wireless charging antenna for wireless charging together with the NFC antenna in the battery pack.
- 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
- 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 ⁇ m thick thin sheets. It is difficult to cope with the handset trend.
- the thickness of the shielding sheet 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.
- 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 amount of magnetic flux increases as the amount of soft magnetic material included in the secondary coil increases, and as the material permeability increases.
- NFC near field communication
- 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.
- 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.
- 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.
- 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.
- 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.
- NFC Near field communications
- 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.
- 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.
- 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.
- the coefficient Q By increasing the coefficient Q, the power transmission efficiency is excellent, and the communication distance is increased.
- 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.
- the frequency fluctuation range can be prevented from increasing, thereby reducing the defective rate of the NFC antenna.
- 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.
- 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.
- 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.
- FIG. 1 is an exploded perspective view showing a magnetic shielding sheet for NFC and wireless charging according to the present invention
- FIG. 2 is a cross-sectional view showing an example of using one sheet of nanocrystalline ribbon according to the first embodiment
- FIG. 3 is a cross-sectional view showing an example of using six nano-crystal ribbon sheet according to the second embodiment
- FIGS. 4 and 5 are cross-sectional views showing the structure of the protective film and double-sided tape used in the present invention, respectively;
- FIG. 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.
- FIG. 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.
- FIG. 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;
- FIG. 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
- FIG. 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.
- FIG. 17 is an exploded perspective view showing the structure of an NFC antenna module according to the present invention.
- 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 device;
- FIG. 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.
- FIG. 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.
- the NFC and wireless charging magnetic shielding sheet 10 is a plurality of fine pieces by heat treatment after the ribbon of the amorphous alloy or nanocrystalline alloy after flake treatment
- 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.
- 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 content of Fe is preferably 70-90 atomic%.
- the sum of Si and B is in the range of 10-30 atomic%, the amorphous forming ability of the alloy is the best.
- 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.
- the Fe-Si-B alloy for example, a crystallization temperature of 508 ° C and a Curie temperature (Tc) of 399 ° C may be used.
- 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.
- an Fe-Si-B-Co-based alloy may be used as the Fe-based amorphous alloy.
- the thin magnetic sheet 2 may be a ribbon of a thin plate made of a Fe-based nanocrystalline magnetic alloy.
- the Fe-based nanocrystalline magnetic alloy it is preferable to use an alloy that satisfies the following expression (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
- 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.
- 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%.
- 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.
- 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.
- 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.
- 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.
- an inorganic material type from the viewpoint of thinning.
- 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 ⁇ m per sheet.
- the thickness of the thin magnetic sheet 2 is preferably set to 25 to 30 ⁇ m. As the thickness of the amorphous ribbon becomes thinner, cracking of the ribbon may occur even with slight impact during handling after heat treatment.
- the magnetic shielding sheet 10 is used by attaching the NFC antenna 6 to the shielding sheet 10 using the double-sided tape 30b.
- 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.
- 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.
- 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.
- the USIM Universal Subscriber Identity Module
- 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.
- the magnetic shielding sheet 10 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.
- 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.
- the magnetic resistance R is reduced more than the decrease in the inductance L value of the magnetic sheet.
- 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.
- 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.
- 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.
- 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.
- 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
- 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.
- 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.
- AC alternating current
- DC direct current
- 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.
- 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.
- the inductance (ie, permeability) of the laminated sheet is preferably about 13 to 21 mu H.
- the permanent magnet 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.
- the inductance (ie, permeability) of the laminated sheet is preferably about 13 to 21 ⁇ H. .
- 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.
- 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 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.
- the shielding sheet 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.
- 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.
- the magnetic field shielding sheet 10c preferably has a width of about 1-2 mm wider than the width of the secondary coil 43.
- 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.
- 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.
- RSP rapid quenching and solidification
- S11 melt spinning
- S12 melt spinning
- 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 ⁇ m 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 °C to 600 °C (S13).
- 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.
- 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.
- the heat treatment temperature is less than 300 °C 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 °C there is a problem that the permeability is significantly lowered by overheating treatment does not exhibit the desired permeability. .
- the heat treatment temperature is low, the treatment time is long.
- the heat treatment temperature is high, the treatment time is shortened.
- 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 ⁇ m 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).
- 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.
- the heat treatment temperature is less than 300 °C 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 °C 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.
- the amorphous ribbon of the present invention uses a thickness having a range of 15 ⁇ 35 ⁇ m, the permeability of the amorphous ribbon increases in proportion to the thickness of the ribbon.
- 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.
- 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.
- the amorphous ribbon sheets 2a; 21-26 are separated into a plurality of fine pieces 20.
- 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.
- 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.
- the magnetic field is increased to remove the hysteresis loss, thereby increasing the uniformity of the permeability to the sheet.
- 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.
- 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.
- the size of the fine pieces 20 may increase, thereby increasing the eddy current loss.
- 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.
- 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).
- 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.
- the first adhesive layer 12 of the protective film 1 is pressed while the first adhesive layer 12 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.
- 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.
- 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.
- 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.
- 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.
- any device can be used as long as the pressing and flake processing of the laminated sheets 100 and 200 can be performed.
- the magnetic field shielding sheet 10 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.
- 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).
- one protective film 1 is attached to one side of the magnetic sheet 2 to flake and laminate treatment.
- 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.
- 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.
- the magnetic shielding sheet according to the present invention may be constructed using the heterogeneous materials shown in FIGS. 15A and 15B.
- 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.
- 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 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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).
- 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.
- 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.
- 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.
- the adhesive further includes a binder, an additive, and a curing agent to increase adhesion.
- the binder may be epoxy
- 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 ⁇ m, preferably 10 to 20 ⁇ m thick. (The thickness of the copper heat dissipation layer is 10 ⁇ m 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.
- 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.
- 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 ⁇ m or more, and the thickness of the seed layer made of Ti—Cu may be set to 0.5 ⁇ m.
- the composite sheet 10d having the magnetic field and the electromagnetic shielding and heat dissipation function 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.
- 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.
- the magnetic field shielding sheet 10-10c 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. .
- 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.
- 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
- 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).
- 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.
- 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.
- 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.
- FIG. 17 is an exploded perspective view illustrating a coupling relationship between a magnetic shielding sheet and an NFC antenna according to the present invention
- 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.
- 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.
- 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.
- the NFC antenna module 103 may be disposed inside the rear cover.
- 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.
- 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.
- FPCBs flexible printed circuit boards
- 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.
- 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),
- the NFC antenna coil 6a may be directly formed on the double-sided tape to be assembled into a thin film structure.
- 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.
- the NFC antenna module 103 which is an assembly of the NFC antenna 6 and the magnetic shielding sheet 10
- 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.
- 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.
- 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.
- NFC near field communications
- Dual antenna 40 for simultaneously performing the NFC and wireless charging function is preferably implemented using an FPCB having a double-sided substrate structure.
- the dual antenna of the present invention is not limited thereto and may have a structure of another type.
- 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.
- 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. .
- the NFC antenna coil 41 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.
- 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).
- 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.
- 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).
- PSR photo solder resist
- the shielding sheet employing the hybrid magnetic sheet of Figs. 15A and 15B can be used.
- 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).
- the NFC antenna coil 41 and the secondary charging coil 43 for wireless charging may be used.
- 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
- 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
- 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 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.
- the length of the entire coil unit 51 is set to have an inductance value suitable for the wireless charging antenna
- 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.
- 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.
- 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 ⁇ m 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 ⁇ thick protective film using a PET substrate and a 10 ⁇ 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.
- 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 ⁇ m.
- a circular flat coil having a inductance of 12.2 ⁇ H and a resistance of 237m ⁇ was used as the secondary coil, that is, the measurement coil, coupled to the shielding sheet.
- the secondary coil that is, the measurement coil, coupled to the shielding sheet.
- the measurement coil was connected 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.
- 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.
- 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.
- 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.
- 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.
- 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
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
- a secondary battery such as a lithium ion battery 7 may have a safety problem when it exceeds 40 ° C. or more.
- 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.
- Amorphous ribbons made of Fe 67 B 14 Si 1 Co 18 alloy were manufactured to have a thickness of 25 ⁇ m 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 ⁇ m thick protective film using a PET substrate and a 10 ⁇ m 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.
- 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.
- the amorphous ribbon sheet was subjected to magnetic field heat treatment at 487 ° C, 459 ° C, and 450 ° C for 1 hour, respectively.
- the inductance (permeability) of each sheet was reduced to 13 ⁇ H, 15 ⁇ H, and 18 ⁇ H 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 ⁇ H, 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.
- the inductance (permeability) was measured using the amorphous ribbon sheet having a thickness of 15 ⁇ H, 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.
- 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).
- 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.
- 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.
- 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.
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Abstract
Description
| 사용된 리본 | 리본 수 | Ls(μH) | Rs(mΩ) | Z(Ω) | Q |
| 비교예 1(No Sheet) | 0 | 12.08 | 245 | 7.59 | 30.9 |
| 비교예 2(비 열처리 리본) | 1 EA | 17.91 | 1020 | 11.3 | 11.03 |
| 비교예 3(열처리된 리본) | 1 EA | 21.74 | 605 | 13.67 | 22.53 |
| 실시예 1(열처리 및 플레이크 처리) | 1 EA | 21.52 | 442 | 13.52 | 30.5 |
| 실시예 2(열처리 및 플레이크 처리) | 2 EA | 21.54 | 355 | 13.54 | 38 |
| 실시예 3(열처리 및 플레이크 처리) | 3 EA | 21.56 | 327 | 13.55 | 41.4 |
| 실시예 4(열처리 및 플레이크 처리) | 4 EA | 21.7 | 308 | 13.64 | 44.2 |
| 사용된 리본 | Tx | Rx | 효율(%) | ||
| V | mA | V | mA | ||
| 비교예 1(No Sheet) | 19 | 188 | 4.87 | 520 | 70.895857 |
| 실시예 5(사각형 리본 6장) | 19 | 205 | 4.87 | 521 | 65.141720 |
| 실시예 6(사각형 리본 9장) | 19 | 194 | 4.87 | 521 | 68.835323 |
| 실시예 7(사각형 리본 12장) | 19 | 190 | 4.87 | 521 | 70.284488 |
| 실시예 8(코일 형상 리본 6장) | 19 | 192 | 4.87 | 521 | 69.552357 |
| 충전 동작시간 | 배터리 온도(℃) | 리본시트 온도(℃) |
| 0.5시간 | 29.5 | 30 |
| 1.0시간 | 30 | 30 |
| 1.5시간 | 30.5 | 30.5 |
| 2.0시간 | 30.5 | 30.5 |
| 2.5시간 | 30.5 | 31 |
| 3.0시간 | 30.5 | 31 |
| 3.5시간 | 30.5 | 31 |
| 4.0시간 | 30.5 | 31 |
| 4.5시간 | 30.5 | 31 |
| 인덕턴스(투자율) | 충전 효율(%) | ||||||||
| 1장 | 2장 | 3장 | 4장 | 5장 | 6장 | 7장 | 8장 | 9장 | |
| 13μH | 56 | 61 | 65.6 | 65.8 | 67.1 | 68.4 | 68.9 | 69.1 | 동작불가 |
| 15μH | 59.2 | 65.8 | 68 | 68.4 | 68.6 | 69.1 | 69.1 | 69.3 | 68.9 |
| 18μH | 57 | 63.6 | 66.3 | 68 | 68.2 | 68.9 | 69.1 | 69.1 | 68.9 |
| 투자율 | 최대 충전 효율(%) | |||
| 1장 | 2장 | 3장 | 4장 | |
| 15μH | 61.3 | 68.7 | 71.1 | 71.9 |
Claims (16)
- 열처리되고 플레이크 처리되어 다수의 미세 조각으로 분리된 비정질 리본시트, 상기 비정질 리본시트의 일측면에 접착된 보호필름 및 상기 비정질 리본시트의 타측면에 접착된 접착테이프를 구비하는 자성시트; 및상기 자성시트에 적층된 전자파 차폐 및 방열용 전도체 시트;를 포함하는 자기장 및 전자파 차폐용 복합시트.
- 제1항에 있어서,상기 자성시트의 다수의 미세 조각 사이의 틈새는 상기 보호필름 및 접착 테이프의 접착제의 일부가 충진되어 있는 자기장 및 전자파 차폐용 복합시트.
- 제1항에 있어서, 다수의 상기 자성시트가 적층되어 있는 자기장 및 전자파 차폐용 복합시트.
- 제1항에 있어서,상기 전도체 시트는 상기 자성시트에 아크릴계 접착제 또는 양면 테이프에 의해 접착되며, 상기 아크릴계 접착제는 10 내지 30volume%의 Ag 또는 Ni 분말을 함유하는 자기장 및 전자파 차폐용 복합시트.
- 제1항에 있어서, 상기 전도체 시트는 금속 박막 또는 진공증착이나 전기도금에 의해 형성되는 금속막으로 이루어지는 자기장 및 전자파 차폐용 복합시트.
- 제1투자율의 제1자성시트; 및상기 제1자성시트의 투자율보다 낮은 제2투자율을 갖고 상기 제1자성시트에 적층되는 제2자성시트를 포함하며,상기 제1자성시트는 다수의 미세 조각으로 분리되고 상기 다수의 미세 조각은 동일한 평면상에 배치되며, 양면에 보호필름과 양면 테이프가 적층되며,상기 다수의 미세 조각 사이의 틈새는 상기 보호필름과 양면 테이프에 포함된 접착층의 일부가 충진되는 자기장 및 전자파 차폐용 복합시트.
- 제6항에 있어서,상기 제1자성시트는 비정질 리본시트를 사용하며,상기 제2자성시트는 자성분말과 수지로 이루어진 폴리머 시트를 사용하는 자기장 및 전자파 차폐용 복합시트.
- 제6항에 있어서,상기 제1자성시트는 비정질 리본시트로 이루어지고, 상기 제2자성시트는 페라이트 시트로 이루어지는 자기장 및 전자파 차폐용 복합시트.
- 제8항에 있어서,상기 제1자성시트는 중앙부에 일정 면적으로 배치되고,상기 제2자성시트는 제1자성시트를 둘러싸는 환형으로 이루어지는 자기장 및 전자파 차폐용 복합시트.
- 제6항에 있어서,상기 제1자성시트의 외측면에 전도성 금속 박막으로 형성되어 전자파 차폐 및 방열 기능을 갖는 전도체 시트를 더 포함하는 자기장 및 전자파 차폐용 복합시트.
- 제6항에 있어서,상기 차폐시트는 무선 충전기의 수신장치에 적용되며,상기 자성시트가 300℃ 내지 600℃의 온도에서 30분 ~ 2시간 동안 무자장 열처리가 이루어진 Fe계 비정질 합금 또는 300℃ 내지 700℃의 온도에서 30분 ~ 2시간 동안 무자장 열처리가 이루어진 나노 결정립 합금으로 이루어지는 자기장 및 전자파 차폐용 복합시트.
- 기판에 루프 형태로 이루어지며 NFC(Near Field Communication) 신호를 송수신하기 위한 NFC 안테나; 및상기 기판에 적층되며, 제1항 내지 제11항 중 어느 한 항에 따른 자기장 및 전자파 차폐용 복합시트를 포함하는 안테나 모듈.
- 기판의 내측에 루프 형태로 형성되며 무선 충전기의 송신장치로부터 전송된 무선 충전용 고주파 전력신호를 수신하기 위한 무선 충전용 2차 코일과 상기 기판의 외측에 루프 형태로 형성되며 NFC용 고주파 신호를 송수신하기 위한 NFC 안테나 코일을 구비하는 듀얼 안테나; 및상기 기판에 적층되며, 제1항 내지 제11항 중 어느 한 항에 따른 자기장 및 전자파 차폐용 복합시트를 포함하는 안테나 모듈.
- 제13항에 있어서,상기 복합시트는 연장 형성되고, 연장 형성된 영역에 수신된 고주파 전력신호를 직류로 변환한 후 직류 레벨변환에 필요한 DC-DC 컨버터회로가 실장되는 안테나 모듈.
- 제13항에 있어서,상기 복합시트는 1 내지 12층의 비정질 리본시트를 사용하는 안테나 모듈.
- 기판의 표면에 나선형으로 패턴 형성된 하나의 코일부와 이로부터 연장된 제1 내지 제3 터미널 단자로 이루어지며 상기 제1 터미널 단자와 제2 터미널 단자 사이에서 NFC용 고주파 신호를 송수신하고, 상기 제3 터미널 단자와 제1 또는 제2 터미널 단자 사이로부터 무선 충전기의 송신장치로부터 전송된 무선 충전용 고주파 신호를 수신하는 NFC 및 무선 충전 겸용 안테나; 및상기 기판에 적층되며, 제1항 내지 제11항 중 어느 한 항에 따른 자기장 및 전자파 차폐용 복합시트를 포함하는 안테나 모듈.
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| CN201480012615.4A CN105027355B (zh) | 2013-03-05 | 2014-03-05 | 磁场及电磁波屏蔽用复合板及具有其的天线模块 |
| US14/772,431 US9812774B2 (en) | 2013-03-05 | 2014-03-05 | Composite sheet for shielding magnetic field and electromagnetic wave, and antenna module comprising same |
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| KR10-2013-0023470 | 2013-03-05 | ||
| KR20130023470 | 2013-03-05 | ||
| KR1020140025828A KR101703842B1 (ko) | 2013-03-05 | 2014-03-05 | 자기장 및 전자파 차폐용 복합시트 및 이를 구비하는 안테나 모듈 |
| KR10-2014-0025828 | 2014-03-05 |
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| CN106515126A (zh) * | 2016-11-08 | 2017-03-22 | 广东小天才科技有限公司 | 磁性叠层结构、磁性叠层结构的制备方法及输入装置 |
| US20210241956A1 (en) * | 2018-09-19 | 2021-08-05 | Amosense Co., Ltd. | Magnetic field shielding sheet, method for manufacturing magnetic field shielding sheet, and antenna module using same |
| US11594356B2 (en) * | 2018-09-19 | 2023-02-28 | Amosense Co., Ltd. | Magnetic field shielding sheet, method for manufacturing magnetic field shielding sheet, and antenna module using same |
| CN112772011B (zh) * | 2018-10-03 | 2022-03-08 | 东洋油墨Sc控股株式会社 | 电磁波遮蔽片以及电子零件搭载基板 |
| CN112772011A (zh) * | 2018-10-03 | 2021-05-07 | 东洋油墨Sc控股株式会社 | 电磁波遮蔽片以及电子零件搭载基板 |
| CN110661079A (zh) * | 2019-10-10 | 2020-01-07 | Oppo(重庆)智能科技有限公司 | 一种壳体组件以及电子装置 |
| CN115917875A (zh) * | 2020-06-22 | 2023-04-04 | 阿莫善斯有限公司 | 天线模块 |
| US20230238702A1 (en) * | 2020-06-22 | 2023-07-27 | AMOSENSE Co.,Ltd | Antenna module |
| US12206186B2 (en) * | 2020-06-22 | 2025-01-21 | Amosense Co., Ltd | Antenna module |
| CN115881407A (zh) * | 2022-12-28 | 2023-03-31 | 西安电掣风云智能科技有限公司 | 一种超薄无线电能传输用的线圈模块及应用 |
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