USOO9252611B2
`
`(12) United States Patent
`Lee et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 9.252,611 B2
`Feb. 2, 2016
`
`(54) MAGNETIC FIELD SHIELDING SHEET FOR
`A WIRELESS CHARGER, METHOD FOR
`MANUFACTURING SAME, AND RECEIVING
`APPARATUS FOR AWIRELESS CHARGER
`USING THE SHEET
`
`(71) Applicant: AMOSENSE CO.,LTD., Cheonan-si
`(KR)
`(72) Inventors: Dong Hoon Lee, Yongin-si (KR); Kil
`Jae Jang, Seoul (KR)
`(73) Assignee: AMOSENSE CO.,LTD. (KR)
`(*) Notice:
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 36 days.
`14/366,439
`
`(21) Appl. No.:
`
`Dec. 21, 2012
`PCT/KR2O12/O11256
`
`(22) PCT Filed:
`(86). PCT No.:
`S371 (c)(1),
`Jun. 18, 2014
`(2) Date:
`(87) PCT Pub. No.: WO2013/095.036
`PCT Pub. Date: Jun. 27, 2013
`
`(65)
`
`(30)
`
`Prior Publication Data
`US 2015/O1236O4A1
`May 7, 2015
`Foreign Application Priority Data
`
`Dec. 21, 2011 (KR) ........................ 10-2011-O138987
`(51) Int. Cl.
`HIM I/44
`HIM I/46
`
`(2006.01)
`(2006.01)
`(Continued)
`
`(52) U.S. Cl.
`CPC ............... H02J 7/0042 (2013.01); B32B37/12
`(2013.01); B32B 37/18 (2013.01);
`(Continued)
`
`
`
`(58) Field of Classification Search
`CPC ......... H02J 5/005; H02J 7/025; H02J 7/0042:
`H02J 7/355; H01F 27/362; H01F 27/365
`USPC ............... 320/107, 108, 114; 336/84 R, 84 C
`See application file for complete search history.
`References Cited
`
`(56)
`
`U.S. PATENT DOCUMENTS
`
`4,774,148 A * 9/1988 Goto ....................... B32B 15,04
`428,607
`5,097,373 A * 3/1992 Yuki ......................... HO1F 3/O2
`360,125.01
`
`(Continued)
`
`FOREIGN PATENT DOCUMENTS
`
`JP
`KR
`
`10, 2006
`2006269536
`2, 2003
`102003OO13831
`(Continued)
`OTHER PUBLICATIONS
`International Search Report PCT/KR2012/01 1256 dated Mar 18,
`2013.
`Primary Examiner — Edward Tso
`(74) Attorney, Agent, or Firm — Cantor Colburn LLP
`(57)
`ABSTRACT
`Provided are a magnetic field shield sheet for a wireless
`charger, which blocks an effect of an alternating-current mag
`netic field generated when a charger function for a portable
`mobile terminal device is implemented in a non-contact wire
`less manner on a main body of the portable mobile terminal
`device and exhibits excellent electric power transmission effi
`ciency, a method of manufacturing the sheet, and a receiver
`for the wireless charger by using the sheet. The sheet
`includes: at least one layer thin magnetic sheet made of an
`amorphous ribbon separated into a plurality of fine pieces; a
`protective film that is adhered on one surface of the thin
`magnetic sheet via a first adhesive layer provided on one side
`of the protective film; and a double-sided tape that is adhered
`on the other Surface of the thin magnetic sheet via a second
`adhesive layer provided on one side of the double-sided adhe
`sive tape, wherein gaps among the plurality of fine pieces are
`filled by some parts of the first and second adhesive layers, to
`thereby isolate the plurality of fine pieces.
`18 Claims, 11 Drawing Sheets
`
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`

`US 9.252,611 B2
`Page 2
`
`(51) Int. Cl.
`H02. 7/00
`HOIF 38/14
`HOIF 27/36
`B32B 37/2
`B32B 37/18
`B32B 38/00
`H02. 7/02
`
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`5,227,727 A * 7/1993 Segawa .................. GOR 33.36
`5,680,046 A * 10, 1997 Frederick
`coirs:
`CCCCK .............
`324,318
`
`FOREIGN PATENT DOCUMENTS
`
`(2006.01)
`
`HO25/00
`(52) U.S. C.
`CPC ......... B32B 38/0004 (2013.01); H01F 27/365
`(2013.01); HOIF 38/14 (2013.01); H02J 5/005
`(2013.01); H02J 7/025 (2013.01)
`
`1020030051394
`KR
`1020030086122
`KR
`102O100031139
`SR
`101399.024
`.
`* cited by examiner
`
`6, 2003
`11, 2003
`3, 2010
`5, 2014
`
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`U.S. Patent
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`Feb. 2, 2016
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`Sheet 1 of 11
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`US 9.252,611 B2
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`FIG. 2
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`V
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`7
`V
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`10a
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`1
`s
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`- 21
`3
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`Sheet 2 of 11
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`US 9.252,611 B2
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`FIG. 3
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`
`
`)
`3a 3b 3c 3d 3e 3f
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`20
`
`FIG. 4
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`FIG. 5
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`4b
`31
`32
`33
`4.
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`Feb. 2, 2016
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`US 9.252,611 B2
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`FIG. 6
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`Sheet 4 of 11
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`US 9.252,611 B2
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`FIG. 7
`
`SAR
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
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`PRESPARE AMORPOS R3BON
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`C
`
`E AMORPOS R3BON N A SEET FORM
`
`S1
`
`S2
`
`EA REAT AMORPHOS RIBRON SEE
`
`S13
`
`AMENAER. BBON SEE BE WEEN PROECW
`EF MAN) () BE-S)ED AP AND EN
`PERFORM FAKE REAMEN
`
`S14
`
`PERFORM AMENAON REAMEN
`
`-S15
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`SAMP AMINAE SEET
`NA) ESRE) SWE AND SAEPE
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`
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`S6
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`FIG. 8
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`US 9.252,611 B2
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`S.
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`FIG 11
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`C
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`400
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`210
`200
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`220
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`FIG. 12
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`1N-240
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`FIG. 14A
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`FIG. 14B
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`US 9.252,611 B2
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`FIG. 15A
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`35
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`,
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`35a 35C 35b
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`FIG. 15B
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`35
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`,
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`35a
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`35b
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`Feb. 2, 2016
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`US 9.252,611 B2
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`FG 16
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`FIG. 17
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`Feb. 2, 2016
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`Sheet 11 of 11
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`US 9.252,611 B2
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`FIG. 19
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`BAERY
`
`RANSMSSON DEVICE
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`
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`
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`1 :
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`

`1.
`MAGNETC FELD SHIELDING SHEET FOR
`A WIRELESS CHARGER, METHOD FOR
`MANUFACTURING SAME, AND RECEIVING
`APPARATUS FOR AWIRELESS CHARGER
`USING THE SHEET
`
`TECHNICAL FIELD
`
`10
`
`The present invention relates to a magnetic field shield
`sheet for a wireless charger, a method of manufacturing the
`magnetic field shield sheet, and a receiver for the wireless
`charger by using the magnetic field shield sheet, and more
`particularly to, a magnetic field shield sheet for a wireless
`charger, which blocks an effect of an alternating-current mag
`netic field generated when a charger function for a portable
`15
`mobile terminal device is implemented in a non-contact wire
`less manner on a main body of the portable mobile terminal
`device and exhibits excellent electric power transmission effi
`ciency, a method of manufacturing the magnetic field shield
`sheet, and a receiver for the wireless charger by using the
`magnetic field shield sheet.
`
`BACKGROUND ART
`
`As methods of charging secondary batteries mounted in
`electronic equipment such as portable terminals and video
`cameras, there are two types of charging methods, i.e., a
`contact type charging method and a non-contact type charg
`ing method. The contact type charging method carries out a
`charging operation by making an electrode of a power recep
`tion device in direct contact with an electrode of a power
`feeding device.
`The contact type charging method is commonly used in a
`wide range of applications, since a structure of a device
`implementing the contact type charging method is simple.
`However, in association with miniaturization and weight
`reduction of electronic equipment, various electronic devices
`become light in the weight thereof, and accordingly a low
`contact pressure between electrodes of the power reception
`device and the power feeding device may cause problems
`Such as charge failure charge error. Further, secondary batter
`ies are weak at heat, which needs to prevent the temperature
`rise of the batteries, and to pay attention to a circuit design so
`as not to cause overcharge and overdischarge. To cope with
`these problems, a non-contact type charging method is being
`considered in recent years.
`The non-contact type charging method is a charging
`method using an electromagnetic induction principle in
`which coils are mounted at both sides of the power reception
`device and the power feeding device.
`A non-contact type charger can be miniaturized by putting
`a ferrite core to be in a magnetic core and winding coils
`around the ferrite core. Furthermore, for miniaturization and
`reduction in thickness, a technique of forming a resin Sub
`strate by mixing ferrite powder and amorphous powder and
`mounting a coil and the like on the resin Substrate, has been
`proposed. However, in the case that a ferrite sheet is processed
`thinly, the thinly processed ferrite sheet may be easily broken
`and weak in impact resistance. As a result, there have been
`problems that defects have occurred in the power reception
`device due to a fall or collision of the non-contact type
`charger.
`Further, in order to reduce thickness of a power reception
`portion of an electronic device in response to reduction in the
`thickness of the electronic device, a planar coil that is formed
`by printing a metal powder paste as a coil have been
`employed. A structure of strengthening a coupling of a planar
`
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`US 9.252,611 B2
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`2
`coil and a magnetic sheet has been proposed. In the proposed
`structure, a magnetic body or a magnetic sheet is used as a
`core material to strengthen the coupling between primary and
`secondary coils.
`Meanwhile, if a power transmission speed increases,
`defects between adjacent transformers, as well as defects
`caused by heat from the Surrounding components, may be
`likely to occur. That is, in the case that the planar coils are
`used, the magnetic flux passing through the planar coils is
`connected to a substrate or the like inside an electronic device,
`an internal portion of the electronic device may be heated due
`to eddy currents caused by electromagnetic induction. As a
`result, large power cannot be transmitted and thus a time
`consuming problem may be caused for charging the elec
`tronic device.
`To cope with this problem, a magnetic body or a magnetic
`sheet was used as a shielding member on the back of the
`substrate. In order to obtain a sufficient shielding effect, as the
`magnetic body or the magnetic sheet may have the larger
`magnetic permeability, and the larger area and thickness, a
`more effective shielding effect can be obtained.
`In general, a magnetic body Such as an amorphous ribbon,
`a ferrite sheet, or a polymer sheet containing magnetic pow
`der is used as the magnetic field shield sheet. An effect of
`focusing a magnetic field for improving magnetic field
`shielding performance and additional features may be good in
`the order of amorphous ribbons, a ferrite sheet, and a polymer
`sheet containing magnetic powder, with high magnetic per
`meability.
`In the case of a power reception device of a conventional
`non-contact type charging system, a magnetic body or a mag
`netic sheet with high magnetic permeability and large volume
`is disposed on the opposite surface to a primary coil side, i.e.,
`on the Surface of a secondary coil, for reinforcement of a
`coupling for improving transmission efficiency, and for
`improving a shielding performance for Suppression of heat
`generation. According to this arrangement, fluctuations in the
`inductance of the primary coil become large, and an operation
`condition of a resonant circuit is shifted from a resonance
`condition at which a sufficient effect can be exhibited accord
`ing to a relative positional relationship between the magnetic
`body and the primary coil.
`Korean Patent Application Publication No. 10-2010-31139
`provides a power reception device for improving a resonance
`performance and also suppressing heat generation to Solve
`the aforementioned problems, and proposes a technique of
`enabling large transmission power and shortening charge
`time, through an the electronic device and a power reception
`system using the power reception device.
`In other words, according to Korean Patent Application
`Publication No. 10-2010-3 1139, a composite magnetic body
`including a plurality of magnetic sheets magnetic ribbons are
`arranged at at least one location between a spiral coil a power
`reception-side spiral coil: a secondary coil and a secondary
`battery, and between a rectifier and the spiral coil, to thereby
`prevent a magnetic flux generated from the power reception
`side spiral coil from interlinking a circuit board and a second
`ary battery, and to thereby suppress noise and heat generation
`caused by an induced electromotive force electromagnetic
`induction, and the amount of fluctuation of inductance in the
`primary coil is controlled due to presence or absence of the
`secondary coil to thus enhance a resonance performance of a
`resonant circuit constituted by the primary coil and to thereby
`effectively control oscillation.
`The composite magnetic body is set So that first magne
`toresistance of a first magnetic sheet adjacent to the spiral coil
`is less than or equal to 60, second magnetoresistance of a
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`3
`second magnetic sheet laminated on the first magnetic sheet is
`greater than or equal to 100, and a value of the second mag
`netoresistance divided by the first magnetoresistance is equal
`to or greater than 1.0.
`The first magnetic sheet is prepared by bonding polycar
`bonate resins on both surfaces of a first amorphous ribbon by
`using adhesive layers, respectively, and the second magnetic
`sheet is prepared by bonding polycarbonate resins on both
`Surfaces of a second amorphous ribbon with large relative
`permeability by using adhesive layers, respectively. Then, the
`first magnetic sheet and the second magnetic sheet are inte
`grally bonded via an adhesive layer.
`Meanwhile, the ferrite sheet or a polymer sheet containing
`magnetic powder has the magnetic permeability a little lower
`than the amorphous ribbon, and thus in order to improve the
`performance of Such low magnetic permeability, thickness of
`the ferrite sheet or a polymer sheet becomes large compared
`to the thinamorphous ribbon of several tens um. Therefore, it
`is difficult to respond to a thinning tendency of terminals.
`Further, in the case of amorphous ribbon with high mag
`netic permeability, the ribbon itself is a metal thin plate, and
`thus there is no burden on thickness of the amorphous ribbon.
`However, when an alternating-current magnetic field accord
`ing to frequency of 100 kHz used for power transmission is
`applied to the amorphous ribbon, functionality of applica
`25
`tions may be reduced due to an influence of eddy currents of
`the ribbon Surface, or problems of reducing wireless charging
`efficiency and causing heat generation may occur.
`Co-based or Fe-based amorphous ribbons can increase
`Surface resistance slightly, through heat treatment. However,
`in the case that a processing treatment such as a flake treat
`ment process of reducing a surface area of the ribbon is
`performed in order to further reduce the eddy current effects,
`the magnetic permeability is significantly degraded and the
`function as the shield sheet is greatly degraded.
`Also, most of wireless chargers employ a structure of
`adopting permanent magnets that assist an alignment with a
`power receiver in a power transmitter for power transmission,
`in order to increase the power transfer efficiency of the charg
`ers to the maximum. A magnetization or saturation phenom
`40
`enon occurs in a thin shield sheet due to a direct-current
`magnetic field of the permanent magnets, to thereby decrease
`the performance of the chargers or sharply decreasing the
`power transmission efficiency.
`Accordingly, in the case of the conventional chargers, the
`45
`thickness of the shield sheet must be quite thick in the order of
`0.5 T or higher, in order to indicate shielding features without
`being affected by the permanent magnets, and to maintain
`high power transmission efficiency, which may cause a major
`obstacle on slimming of portable terminals.
`A Voltage induced in a secondary coil of a wireless charger
`is determined by the Faraday's law and the Lenz’s law, and
`thus it is more advantageous to have the greater amount of
`magnetic flux linked with the secondary coil in order to obtain
`a high Voltage signal. The amount of the magnetic flux
`becomes large as the amount of a soft magnetic material
`contained in the secondary coil becomes large and the mag
`netic permeability of the material becomes high. In particular,
`since the wireless chargers essentially employ a non-contact
`power transmission system, a magnetic field shield sheet in
`which the secondary coil is mounted is needed to be made of
`a magnetic material with high permeability, in order to focus
`wireless electromagnetic waves made from the primary coil
`of a power transmission device, on the secondary coil of a
`power reception device.
`Conventional magnetic field shield sheets for wireless
`chargers do not present Solutions for attaining the thin film but
`
`4
`Solving the heat generation problem due to shields and
`improving the wireless charging efficiency. Thus, the present
`inventors recognized that inductance (magnetic permeabil
`ity) is less reduced and magnetoresistance is greatly reduced,
`although an amorphous ribbon undergoes flakes in the case of
`the amorphous ribbon, and thus a quality factor (Q) of the
`secondary coil is increased, to thereby reach the present
`invention.
`
`DISCLOSURE
`
`Technical Problem
`
`To solve the above problems or defects, it is an object of the
`present invention to provide a magnetic field shield sheet for
`a wireless charger, which greatly reduces a loss due to eddy
`currents by a flake treatment process of an amorphous ribbon,
`to thereby block an effect of a magnetic field influencing upon
`a main body and a battery of a portable mobile terminal
`device and simultaneously to increase a quality factor (Q) of
`a secondary coil, and to thus exhibit excellent electric power
`transmission efficiency, a method of manufacturing the mag
`netic field shield sheet, and a receiver for the wireless charger
`by using the magnetic field shield sheet.
`It is another object of the present invention to provide a
`magnetic field shield sheet for a wireless charger, which fills
`a gap between fine pieces of an amorphous ribbon through a
`flake treatment process of the amorphous ribbon and then a
`compression laminating process with an adhesive, to thereby
`prevent water penetration, and which simultaneously Sur
`rounds all surfaces of the fine pieces with an adhesive (or a
`dielectric) to thus mutually isolate the fine pieces to thereby
`promote reduction of eddy currents and prevent shielding
`performance from falling, and a manufacturing method
`thereof.
`It is still another object of the present invention to provide
`a magnetic field shield sheet for a wireless charger, which
`establishes a shape of a shield sheet into a shape similar to that
`of a secondary coil of a receiving device for a wireless
`charger, to thereby exhibit high powertransmission efficiency
`even though a small number of nanocrystalline ribbons are
`used, and a power reception device using the magnetic field
`shield sheet.
`It is yet another object of the present invention to provide a
`magnetic field shield sheet for a wireless charger, which
`sequentially performs a flake treatment process and a lami
`nating process by using a roll-to-roll method, to thereby
`achieve a sheet molding process to thus maintain original
`thickness of the sheet and to thus exhibit high productivity
`and inexpensive manufacturing costs.
`
`Technical Solution
`
`To accomplish the above and other objects of the present
`invention, according to an aspect of the present invention,
`there is provided a magnetic field shield sheet for a wireless
`charger, the magnetic field shield sheet comprising:
`at least one layer thin magnetic sheet made of an amor
`phous ribbon separated into a plurality of fine pieces;
`a protective film that is adhered on one surface of the thin
`magnetic sheet via a first adhesive layer provided on one side
`of the protective film; and
`a double-sided tape that is adhered on the other surface of
`the thin magnetic sheet via a second adhesive layer provided
`on one side of the double-sided adhesive tape,
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`5
`wherein gaps among the plurality offine pieces are filled by
`some parts of the first and second adhesive layers, to thereby
`isolate the plurality of fine pieces.
`According to another aspect of the present invention, there
`is provided a method of manufacturing a magnetic field shield
`sheet for a wireless charger, the method comprising the steps
`of:
`adhering a protective film and a double-sided tape formed
`of a release film on an exposed surface of the double-sided
`tape, on both sides of at least one layer thin magnetic sheet
`made of an amorphous ribbon, to thereby form a laminate
`sheet;
`performing a flake treatment process of the laminate sheet
`to thus separate the thin magnetic sheet into a plurality offine
`pieces; and
`laminating the flake treatedlaminate sheet, to thus fill some
`parts of first and second adhesive layers provided in the pro
`tective film and the double-sided tape into gaps among the
`plurality of fine pieces,
`a protective film that is adhered on one surface of the thin
`magnetic sheet via a first adhesive layer provided on one side
`of the protective film; and
`a double-sided tape that is adhered on the other surface of
`the thin magnetic sheet via a second adhesive layer provided
`on one side of the double-sided adhesive tape, together with
`flattening and thinning of the laminate sheet, and to thereby
`isolate the plurality of fine pieces.
`According to still another aspect of the present invention,
`there is provided a reception device for a wireless charger that
`charges a secondary battery by an electromagnetic induction
`method from a transmission device for the wireless charger,
`the reception device comprising:
`a secondary coil that receives a wireless high frequency
`signal transmitted by the electromagnetic induction method
`from the transmission device; and
`a magnetic field shield sheet that is disposed between the
`secondary coil and the secondary battery, and that shields a
`magnetic field generated by the wireless high frequency sig
`nal and simultaneously induces the secondary coil to absorb
`the wireless high frequency signal necessary to perform a
`wireless charging function,
`wherein the magnetic field shield sheet comprises:
`at least one layer thin magnetic sheet made of an amor
`phous ribbon separated into a plurality of fine pieces;
`a protective film that is adhered on one surface of the thin
`magnetic sheet via a first adhesive layer provided on one side
`of the protective film; and
`a double-sided tape that is adhered on the other surface of
`the thin magnetic sheet via a second adhesive layer provided
`on one side of the double-sided adhesive tape,
`wherein gaps among the plurality of fine pieces are filled by
`some parts of the first and second adhesive layers, to thereby
`isolate the plurality of fine pieces.
`Advantageous Effects
`
`6
`In addition, the present invention provides a magnetic field
`shield sheet for a wireless charger, which fills a gap between
`fine pieces of an amorphous ribbon through a flake treatment
`process of the amorphous ribbon and then a compression
`laminating process with an adhesive, to thereby prevent water
`penetration, and which simultaneously surrounds all Surfaces
`of the fine pieces with an adhesive (or a dielectric) to thus
`mutually isolate the fine pieces to thereby promote reduction
`of eddy currents and prevent shielding performance from
`falling, and a manufacturing method thereof As a result, all
`surfaces of the fine pieces are surrounded by an adhesive (or
`a dielectric material) to thereby prevent water from penetrat
`ing into the amorphous ribbon and to thus prevent the amor
`phous ribbon from being oxidized and changes in appearance
`and characteristics from being deteriorated.
`Moreover, the present invention provides a magnetic field
`shield sheet for a wireless charger, which establishes a shape
`of a shield sheet into a shape similar to that of a coil of a
`receiving device for a wireless charger, to thereby exhibit a
`high power transmission efficiency or equal power transmis
`sion efficiency while lowering thickness of the magnetic field
`shield sheet to be equal to or less than 0.3 mm, even though a
`Small number of nanocrystalline ribbons are used, and a
`power reception device using the magnetic field shield sheet.
`In addition, the present invention provides a magnetic field
`shield sheet for a wireless charger, which sequentially per
`forms a flake treatment process and a laminating process by
`using a roll-to-roll method, to thereby achieve a sheet mold
`ing process to thus maintain original thickness of the sheet
`and to thus exhibit high productivity and inexpensive manu
`facturing costs.
`
`DESCRIPTION OF DRAWINGS
`
`FIG. 1 is an exploded perspective view showing a magnetic
`field shield sheet for a wireless charger according to the
`present invention.
`FIG. 2 is a cross-sectional view showing an example of
`using one piece of nanocrystalline ribbon sheet according to
`a first embodiment of the present invention.
`FIG. 3 is a cross-sectional view showing an example of
`using six pieces of nanocrystalline ribbon sheets according to
`a second embodiment of the present invention.
`FIGS. 4 and 5 are cross-sectional views showing the struc
`ture of a protective film and a double-sided tape that are
`respectively used in the present invention.
`FIG. 6 is an exploded perspective view showing a magnetic
`field shield sheet for a wireless charger according to a third
`embodiment of the present invention.
`FIG. 7 is a flowchart view for describing a process of
`manufacturing a magnetic field shield sheet for a wireless
`charger according to the present invention.
`FIGS. 8 and 9 are cross-sectional views showing a flake
`treatment process of a laminate sheet according to the present
`invention, respectively.
`FIG. 10 is a cross-sectional view showing a state where a
`laminate sheet is flake-processed according to the present
`invention.
`FIGS. 11 and 12 are cross-sectional views showing a lami
`nating process of a flake-treated laminate sheet according to
`the present invention, respectively.
`FIG. 13 is a cross-sectional view showing a state where a
`magnetic field shield sheet for a wireless charger according to
`a first embodiment of the present invention has been flake
`processed and then laminated.
`FIG. 14A is an enlarged photograph of a magnetic field
`shield sheet that has not passed through a laminating process
`
`5
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`10
`
`15
`
`25
`
`30
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`35
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`40
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`45
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`50
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`55
`
`As described above, the present invention provides a mag
`netic field shield sheet for a wireless charger, which greatly
`reduces a loss due to eddy currents by a flake treatment
`process of an amorphous ribbon, to thereby block an effect of
`a magnetic field influencing upon a main body and a battery of
`a portable mobile terminal device and simultaneously to
`increase a quality factor (Q) of a secondary coil, and to thus
`exhibit excellent electric power transmission efficiency, a
`method of manufacturing the magnetic field shield sheet, and
`a receiver for the wireless charger by using the magnetic field
`shield sheet.
`
`60
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`65
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`Ex.1006
`APPLE INC. / Page 16 of 26
`
`

`

`US 9.252,611 B2
`
`7
`after having performed a flake treatment process, but has
`undergone a humidity test, and FIG. 14B is an enlarged pho
`tograph of a magnetic field shield sheet that has passed
`through a laminating process after having performed a flake
`treatment process and has undergone a humidity test.
`FIGS. 15A and 15B are a cross-sectional view and a plan
`view showing a thin magnetic sheet that is used in a magnetic
`field shield sheet for a wireless charger according to a fourth
`embodiment of the present invention.
`FIG. 16 is an exploded perspective view showing a struc
`ture that a magnetic field shield sheet according to the present
`invention is applied to a reception device for a wireless
`charger.
`FIG. 17 is an exploded perspective view showing that the
`reception device for a wireless charger of FIG. 16 is
`assembled with a battery cover and coupled with a portable
`terminal.
`FIG. 18 is a plan view showing a dual-antenna structure in
`which an antenna for near field communications (NFC) and
`an antenna for a wireless charger are formed by using a
`flexible printed circuit board (FPCB).
`FIG. 19 is a schematic diagram showing a measuring struc
`ture for testing the efficiency and temperature characteristics
`of a magnetic field shield sheet according to the present
`invention.
`
`10
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`15
`
`25
`
`8
`and the content of a sum of Si and B is 10-30 at %. The higher
`content of Fe and other metals may be, the higher the satura
`tion magnetic flux density may be, but when the content of Fe
`is excessive, it is difficult to form an amorphous state. Thus,
`the content of Fe in the present invention is preferably 70-90
`at %. In addition, when the content of the sum of Si and B is
`in the range of 10-30 at %, an amorphous forming capability
`ofan alloy is the most excellent. In order to prevent corrosion,
`corrosion resistant elements such as Crand Co can be added
`within 20 at % into this basic composition, and if necessary,
`other metallic elements may be included in Small quantities in
`the basic composition to impart different properties.
`The Fe—Si Balloys can be used; for example, the crys
`tallization temperature of a certain Fe—Si Balloy is 508°
`C., and the Curie temperature (Tc) thereof is 399° C. How
`ever, the crystallization temperature can be varied depending
`on the content of Si and B, or the other metal elements and the
`content thereof added in addition to ternary alloy elements.
`A Fe-based amorphous alloy, for example, a Fe-Si-B-
`Co-based alloy may be used according to the required condi
`tions, in the present invention.
`Meanwhile, a thin ribbon made of a Fe-based nanocrystal
`line magnetic alloy can be used as the thin magnetic sheet 2.
`An alloy satisfying the following Equation 1 is preferably
`used as the Fe-based nanocrystalline magnetic alloy.
`
`Equation 1
`Fe100-c-d-e-figA.D.E.S./B.Zi,
`In Equation 1, an element A is at least one element selected
`from Cu and Au, an element D is at least one element selected
`from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Ni, Co, and rare earth
`elements, an element E is at least one element selected from
`Mn, Al. Ga, Ge, In, Sn, and platinum group elements, an
`element Z is at least one element selected from C, N, and P. c.
`d, e, f, g, and h are numbers that satisfy the following rela
`tional expressions 0.01 scs8 at %, 0.01sds 10 at 96,0ses 10 at
`%, 10sfs25 at %, 3.sgs 12 at %, 15sf+g+hs35 at %, respec
`tively, and the alloy structure of an area ratio of 20% or more
`is formed of the fine structure of the particle size of equal to or
`less than 50 nm.
`In the aforementioned Equation 1, the element A is used to
`enhance corrosion resistance of the alloy, to prevent coarsen
`ing of crystal grains and at the same time, improve the mag
`netic properties such as the iron loss and the permeability of
`the alloy. When the content of the element A is too small, it is
`difficult to obtain the effect of Suppressing coarsening of
`crystal grains. Conversely, when the content of the element A
`is excessively large, the magnetic properties are degraded.
`Thus, it is preferable that the content of the element A is in the
`range from 0.01 to 8 at 96. The element D is an element that is
`effective for the uniformity of the crystal grain diameter, the
`reduction of magnetostriction, etc. It is preferable that the
`content of the element D is in the range from 0.01 to 10 at %.
`The element E is an element that is effective for the soft
`magnetic properties of the alloy and improvement of corro
`sion resistance of the alloy. The content of the element E is
`preferably not more than 10 at %. The elements Si and B are
`elements that make the alloy to become amorphous at the time
`of producing the magnetic sheet. It is preferable that the
`content of the element Si is in the range from 10 to 25 at %,
`and it is preferable that the content of the element B is in the
`range from 3 to 12 at %. In addition, it may include the
`element Z as an element that makes the alloy to become
`amorphous, other than Si and B. In that case, the total content
`of the elements Si, B and Z is preferably in the range of 15 to
`35 at %. It is preferable to implement t