IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII
`US009252611B2
`
`112) United States Patent
`Lee et al.
`
`110) Patent No. :
`145) Date of Patent:
`
`US 9,252,611 B2
`Feb. 2, 2016
`
`154) MAGNETIC FIELD SHIELDING SHEET FOR
`A WIRELESS CHARGER, METHOD FOR
`MANUFACTURING SAME, AND RECEIVING
`APPARATUS FOR A WIRELESS CHARGER
`USING THE SHEET
`
`171) Applicant: AMOSENSE CO., LTD., Cheonan-si
`1KR)
`
`172)
`
`Inventors: Dong Hoon Lee, Yongin-si 1KR); Kil
`Jae Jang, Seoul 1KR)
`
`173) Assignee: AMOSENSE CO., LTD. 1KR)
`* ) Notice:
`
`1
`
`the term of this
`Subject to any disclaimer,
`is extended or adjusted under 35
`patent
`U.S.C. 1541b) by 36 days.
`
`121) Appl. No. :
`
`14/366, 439
`
`122) PCT Filed:
`
`Dec. 21, 2012
`
`186) PCT No. :
`) 371 1c)11),
`12) Date:
`
`PCT/KR2012/011256
`
`Jun. 1S, 2014
`
`187) PCT Pub. No. : WO2013/095036
`PCT Pub. Date: Jun. 27, 2013
`
`165)
`
`130)
`
`Prior Publication Data
`US 2015/0123604 Al
`May 7, 2015
`
`Foreign Application Priority Data
`
`Dec. 21, 2011
`
`1KR)
`
`10-2011-0138987
`
`151)
`
`Int. Cl.
`H01/II 10/44
`H01/II 10/46
`
`152) U.S. Cl.
`CPC ....
`
`12006.01)
`12006.01)
`1Continued)
`
`H02J 7/0042 12013.01);8328 37/12
`12013.01);8328 37/18 12013.01);
`
`1Continued)
`
`158) Field of ClassiTication Search
`CPC ......... H02J 5/005; H02J7/025; H02J7/0042;
`H02J 7/355; HOIF 27/362; HOIF 27/365
`USPC ............... 320/107, 108, 114; 336/84 R, 84 C
`See application file for complete search history.
`References Cited
`
`156)
`
`U.S. PATENT DOCUMENTS
`4,774, 148 A *
`5,097,373 A *
`
`9/1988 Goto
`
`3/1992 Yuki
`
`. .. B32B IS/04
`428/607
`. ... . HOIF 3/02
`360/125. 01
`
`1Continued)
`
`FOREIGN PATENT DOCUMENTS
`
`JP
`KR
`
`2006269536
`1020030013831
`
`10/2006
`2/2003
`
`1Continued)
`OTHER PUBLICATIONS
`PCT/KR2012/011256 dated Mar. 18,
`Search Report
`
`International
`2013.
`Edward Tso
`Primary Examiner
`174) Attorney, Agent, or Firm
`Cantor Colburn LLP
`ABSTRACT
`157)
`for a wireless
`Provided are a magnetic
`field shield sheet
`charger, which blocks an effect of an alternating-current mag-
`function for a portable
`netic field generated when a charger
`in a non-contact wire-
`mobile terminal device is implemented
`less manner on a main body of the portable mobile terminal
`device and exhibits excellent electric power transmission efii-
`ciency, a method of manufacturing
`the sheet, and a receiver
`for
`the sheet. The sheet
`the wireless
`charger
`by using
`sheet made of an
`includes: at least one layer thin magnetic
`ribbon separated into a plurality of fine pieces; a
`amorphous
`is adhered on one surface of the thin
`protective
`film that
`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 ofthe 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.
`1S Claims, 11 Drawing Sheets
`
`30a
`6
`
`10
`7
`101
`
`Petitioner Samsung and Google Ex-1007, 0001
`
`

`

`US 9,252,611 B2
`Page 2
`
`(51)
`
`Int. Cl.
`H02J 7/00
`H01F 38/14
`H01F 27/36
`8328 37/12
`8328 37/18
`8328 38/00
`H02J 7/02
`H02J 5/00
`(52) U.S. CI.
`CPC ......... 8328 38/0004 (2013.01);H01F 27/365
`(2013.01);H01F 38/14 (2013.01);H02J5/005
`(2013.01);H02J 7/025 (2013.01)
`
`(2006.01)
`(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 . ... ..
`5,680,046 A * 10/1997 Frederick . ..
`
`G01R 33/36
`324/318
`G01R 33/422
`324/318
`
`FOREIGN PATENT DOCUMENTS
`
`1020030051394
`KR
`KR
`1020030086122
`1020100031139
`KR
`101399024
`KR
`* cited by examiner
`
`6/2003
`11/2003
`3/2010
`5/2014
`
`Petitioner Samsung and Google Ex-1007, 0002
`
`

`

`U.S. Patent
`
`Feb. 2, 2016
`
`Sheet 1 of 11
`
`US 9,252,611 B2
`
`FIG. 1
`
`10
`
`FIG. 2
`
`1Oa
`
`21
`3
`
`21
`—31
`32 3
`33
`
`20
`
`Petitioner Samsung and Google Ex-1007, 0003
`
`

`

`U.S. Patent
`
`Feb. 2, 2016
`
`Sheet 2 of 11
`
`US 9,252,611 B2
`
`FIG. 3
`
`10b
`
`3a 3b 3c 3d 3e 3f
`
`20
`
`FIG. 4
`
`FIG. 5
`
`21
`22
`23
`24
`25
`26
`
`11
`---12)
`4a
`
`4b
`31
`32
`33
`4
`
`Petitioner Samsung and Google Ex-1007, 0004
`
`

`

`U.S. Patent
`
`Feb. 2, 2016
`
`Sheet 3 of 11
`
`US 9,252,611 B2
`
`FIG. 6
`
`iOc
`
`ia
`
`2b
`
`30
`
`Petitioner Samsung and Google Ex-1007, 0005
`
`

`

`U.S. Patent
`
`Feb. 2, 2016
`
`Sheet 4 of 11
`
`US 9,252,611 B2
`
`FIG. 7
`
`SYART
`
`PREPARE cV~IORPI-K)l JS RIBBON
`
`("l)'I THE AMORPFIOL! S RIBBON IN A SHEET FORM
`
`HEAT I'REAI' ARIORPHOIJS RIBBON SFIEET
`
`LAMINA'I E RIBBON SFIFET BETWEEN PROTE("I IV
`EFlLM AND J3OUBLE-SIDE13 TAP AND TI.lEN
`PERFORM FLAKE TREATMENT
`
`PERFORM LAMINA I'ION TREAI MEN'I'
`
`STAMP LAMINATE SI-IEET
`IN A DESIRED SIZE AND SIIAPE
`
`Petitioner Samsung and Google Ex-1007, 0006
`
`

`

`U.S. Patent
`
`Feb. 2, 2016
`
`Sheet 5 of 11
`
`US 9,252,611 B2
`
`FIG. 8
`
`110
`
`116
`112
`
`100
`
`114
`
`120
`
`126
`
`122
`
`100
`
`124
`
`FIG. 9
`
`Petitioner Samsung and Google Ex-1007, 0007
`
`

`

`U.S. Patent
`
`Feb. 2, 2016
`
`Sheet 6 of 11
`
`US 9,252,611 B2
`
`FIG. 10
`
`200
`
`20a
`I
`
`20
`
`4}&
`2a
`~31
`32 3
`
`LLL
`
`.V.LLL' LtLLLLLL
`
`FIG. 11
`
`400
`
`2i 0
`
`200
`
`220
`
`Petitioner Samsung and Google Ex-1007, 0008
`
`

`

`U.S. Patent
`
`Feb. 2, 2016
`
`Sheet 7 of 11
`
`US 9,252,611 B2
`
`FIG. 12
`
`500
`
`250
`
`(
`
`200
`
`240
`
`FIG. 13
`
`20
`
`Petitioner Samsung and Google Ex-1007, 0009
`
`

`

`U.S. Patent
`
`Feb. 2, 2016
`
`Sheet 8 of 11
`
`US 9,252,611 B2
`
`FIG. 14A
`
`FIG. 14B
`
`Petitioner Samsung and Google Ex-1007, 0010
`
`

`

`U.S. Patent
`
`Feb. 2, 2016
`
`Sheet 9 of 11
`
`US 9,252,611 B2
`
`FIG. 15A
`
`FIG. 15B
`
`35a
`
`35b
`
`Petitioner Samsung and Google Ex-1007, 0011
`
`

`

`U.S. Patent
`
`Feb. 2, 2016
`
`Sheet 10 of 11
`
`US 9,252,611 B2
`
`FIG. 16
`
`6a
`
`6b
`
`FIG. 17
`
`30a
`6
`
`30
`
`7
`101
`
`Petitioner Samsung and Google Ex-1007, 0012
`
`

`

`U.S. Patent
`
`Feb. 2, 2016
`
`Sheet 11 of 11
`
`US 9,252,611 B2
`
`FIG. 18
`
`43
`
`47c
`
`41
`
`47a
`
`40
`
`47b 47d
`
`ea
`43a
`43b
`41b
`
`45b
`
`49
`
`45a
`
`FIG. 19
`
`BATTERY
`
`'I'kANSMISS1ON Dt VJCE
`
`Petitioner Samsung and Google Ex-1007, 0013
`
`

`

`US 9,252,611 B2
`
`1
`MAGNETIC FIELD SHIELDING SHEET FOR
`A WIRELESS CHARGER, METHOD FOR
`MANUFACTURING SAME, AND RECEIVING
`APPARATUS FORA WIRELESS CHARGER
`USING THE SHEET
`
`TECHNICAL FIELD
`
`to a magnetic
`The present
`relates
`field shield
`invention
`sheet for a wireless charger, a method of manufacturing
`the
`for the wireless
`field shield sheet, and a receiver
`magnetic
`field shield sheet, and more
`charger by using the magnetic
`field shield sheet for a wireless
`to, a magnetic
`particularly
`charger, which blocks an effect of an alternating-current mag-
`function for a portable
`netic field generated when a charger
`in a non-contact wire-
`mobile terminal device is implemented
`less manner on a main body of the portable mobile terminal
`device and exhibits excellent electric power transmission efft-
`ciency, a method of manufacturing
`the magnetic field shield
`for the wireless
`sheet, and a receiver
`charger by using the
`magnetic field shield sheet.
`
`BACKGROUND ART
`
`As methods of charging
`secondary batteries mounted
`in
`electronic equipment
`and video
`such as portable terminals
`there are two types of charging methods,
`i.e., a
`cameras,
`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
`since a structure of a device
`wide range of applications,
`the contact
`type charging method is simple.
`implementing
`in association with miniaturization
`and weight
`However,
`reduction of electronic equipment, various electronic devices
`become light
`thereof, and accordingly
`a low
`in the weight
`contact pressure between electrodes of the power reception
`feeding device may cause problems
`device and the power
`secondary batter-
`such as charge failure charge error. Further,
`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
`is a charging
`charging method
`type
`an electromagnetic
`method
`in
`induction
`principle
`using
`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
`a technique of forming a resin sub-
`reduction in thickness,
`strate by mixing ferrite powder and amorphous
`powder and
`a coil and the like on the resin substrate, has been
`mounting
`in the case that a ferrite sheet is processed
`proposed. However,
`the thinly processed ferrite sheet may be easily broken
`thinly,
`resistance. As a result,
`there have been
`and weak in impact
`that defects have occurred in the power reception
`problems
`device due to a fall or collision of the non-contact
`type
`charger.
`in order to reduce thickness of a power reception
`Further,
`portion of an electronic device in response to reduction in the
`thickness of the electronic device, a planar coil that is formed
`as a coil have been
`a metal powder
`paste
`by printing
`employed. A structure of strengthening
`a coupling of a planar
`
`10
`
`15
`
`20
`
`25
`
`30
`
`35
`
`40
`
`45
`
`50
`
`55
`
`60
`
`65
`
`coil and a magnetic sheet has been proposed.
`In the proposed
`a magnetic body or a magnetic
`is used as a
`sheet
`structure,
`core material
`to strengthen the coupling between primary and
`secondary coils.
`if a power
`speed increases,
`transmission
`Meanwhile,
`as well as defects
`defects between adjacent
`transformers,
`components, may be
`caused by heat
`from the surrounding
`is, in the case that
`likely to occur. That
`the planar coils are
`flux passing through the planar coils is
`the magnetic
`used,
`connected to a substrate or the like inside an electronic device,
`an internal portion ofthe electronic device may be heated due
`to eddy currents caused by electromagnetic
`induction. As a
`and thus a time-
`large power cannot be transmitted
`result,
`problem may be caused for charging the elec-
`consuming
`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
`In order to obtain a sufficient shielding effect, as the
`substrate.
`magnetic body or the magnetic
`sheet may have the larger
`and the larger area and thickness,
`a
`magnetic permeability,
`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-
`field shield sheet. An effect of
`der is used as the magnetic
`field for
`a magnetic
`focusing
`field
`improving magnetic
`features may be good in
`shielding performance
`and additional
`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
`type charging system, a magnetic body or a mag-
`non-contact
`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
`for
`and for
`transmission
`efficiency,
`improving
`coupling
`for suppression of heat
`a shielding performance
`improving
`generation. According to this arrangement,
`in the
`fluctuations
`inductance ofthe primary coil become large, and an operation
`condition of a resonant
`circuit
`is shifted from a resonance
`condition at which a su fficient 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
`to solve
`performance
`heat generation
`and also suppressing
`a technique of
`the aforementioned
`and proposes
`problems,
`large transmission
`charge
`power
`and shortening
`enabling
`through an the electronic device and a power reception
`time,
`system using the power reception device.
`In other words, according to Korean Patent Application
`Publication No. 10-2010-31139,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
`spiral coil: a secondary coil and a secondary
`reception-side
`battery, and between a rectifier and the spiral coil, to thereby
`prevent a magnetic flux generated from the power reception-
`a circuit board and a second-
`side spiral coil from interlinking
`ary battery, and to thereby suppress noise and heat generation
`force electromagnetic
`caused by an induced electromotive
`and the amount of fluctuation of inductance
`in the
`induction,
`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 ofa first magnetic sheet adjacent to the spiral coil
`of a
`is less than or equal
`to 60, second magnetoresistance
`
`Petitioner Samsung and Google Ex-1007, 0014
`
`

`

`US 9,252,611 B2
`
`second magnetic sheet laminated on the first magnetic sheet is
`to 100, and a value of the second mag-
`greater than or equal
`netoresistance divided by the first magnetoresistance
`is equal
`to or greater than 1.0.
`The first magnetic
`is prepared by bonding polycar-
`sheet
`bonate resins on both surfaces of a first amorphous
`ribbon by
`and the second magnetic
`using adhesive layers, respectively,
`resins on both
`sheet
`is prepared by bonding polycarbonate
`surfaces of a second amorphous
`ribbon with large relative
`permeability by using adhesive layers, respectively. Then, the
`sheet are inte-
`sheet and the second magnetic
`first magnetic
`grally bonded via an adhesive layer.
`the ferrite sheet or a polymer
`sheet containing
`Meanwhile,
`a little lower
`magnetic powder has the magnetic permeability
`ribbon, and thus in order to improve the
`than the amorphous
`performance of such low magnetic permeability,
`thickness of
`sheet becomes large compared
`the ferrite sheet or a polymer
`ribbon of several
`tens pm. Therefore,
`to the thin amorphous
`it
`to respond to a thinning tendency of terminals.
`is difficult
`in the case of amorphous
`ribbon with high mag-
`Further,
`the ribbon itself is a metal
`netic permeability,
`thin plate, and
`thus there is no burden on thickness ofthe amorphous
`ribbon.
`However, when an alternating-current magnetic field accord-
`ing to frequency of 100 kHz used for power transmission
`is
`of applica-
`applied to the amorphous
`ribbon,
`functionality
`tions may be reduced due to an influence of eddy currents of
`the ribbon surface, or problems ofreducing wireless charging
`efficiency and causing heat generation may occur.
`Co-based or Fe-based amorphous
`can increase
`ribbons
`surface resistance slightly,
`through heat treatment. However,
`such as a flake treat-
`in the case that a processing treatment
`a surface area of the ribbon is
`ment process of reducing
`performed in order to further reduce the eddy current effects,
`is significantly
`degraded and the
`the magnetic permeability
`is greatly degraded.
`function as the shield sheet
`a structure of
`Also, most of wireless
`chargers
`employ
`that assist an alignment with a
`adopting permanent magnets
`for power transmission,
`power receiver in a power transmitter
`in order to increase the power trans fer efficiency ofthe charg-
`ers to the maximum. A magnetization
`or saturation phenom-
`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
`efficiency.
`power transmission
`in the case of the conventional
`the
`Accordingly,
`chargers,
`thickness ofthe 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
`efficiency, which may cause a major
`high power transmission
`obstacle on slimming of portable terminals.
`A voltage induced in a secondary coil of a wireless charger
`law and the Lenz's law, and
`is determined by the Faraday's
`to have the greater amount of
`thus it is more advantageous
`magnetic flux linked with the secondary coil in order to obtain
`signal. The amount of the magnetic
`a high voltage
`flux
`large as the amount of a soft magnetic material
`becomes
`contained in the secondary coil becomes large and the mag-
`netic permeability ofthe material becomes high. In particular,
`since the wireless chargers essentially employ a non-contact
`system, a magnetic
`in
`field shield sheet
`transmission
`power
`which the secondary coil is mounted is needed to be made of
`in order to focus
`a magnetic material with high permeability,
`wireless electromagnetic waves made from the primary coil
`of a power
`device, on the secondary coil of a
`transmission
`power reception device.
`for wireless
`field shield sheets
`Conventional magnetic
`chargers do not present solutions for attaining the thin film but
`
`5
`
`10
`
`15
`
`20
`
`25
`
`30
`
`35
`
`40
`
`45
`
`50
`
`55
`
`60
`
`65
`
`problem due to shields
`the heat generation
`and
`solving
`improving the wireless charging efficiency. Thus, the present
`recognized that
`(magnetic permeabil-
`inductance
`inventors
`ity) is less reduced and magnetoresistance
`is greatly reduced,
`flakes in the case of
`ribbon undergoes
`although an amorphous
`ribbon, and thus a quality factor (Q) of the
`the amorphous
`coil
`reach the present
`to thereby
`is increased,
`secondary
`invention.
`
`DISCLOSURE
`
`Technical Problem
`
`it is an object ofthe
`To solve the above problems or defects,
`invention to provide a magnetic field shield sheet for
`present
`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 ofa magnetic field influencing upon
`a main body and a battery of a portable mobile terminal
`to increase a quality factor (Q) of
`device and simultaneously
`a secondary coil, and to thus exhibit excellent electric power
`efficiency, a method of manufacturing
`the mag-
`transmission
`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
`to provide a
`invention
`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
`sur-
`and which simultaneously
`prevent water penetration,
`all surfaces of the fine pieces with an adhesive
`(or a
`rounds
`dielectric) to thus mutually
`isolate the fine pieces to thereby
`reduction of eddy currents
`promote
`shielding
`and prevent
`performance
`and a manufacturing
`from falling,
`method
`thereof.
`It is still another object of the present
`invention to provide
`field shield sheet for a wireless
`a magnetic
`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
`to thereby exhibit high power transmission efficiency
`charger,
`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 ofthe present
`invention to provide a
`for a wireless
`field shield sheet
`charger, which
`magnetic
`performs a flake treatment process and a lami-
`sequentially
`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
`costs.
`and inexpensive manufacturing
`
`Technical Solution
`
`To accomplish the above and other objects of the present
`according to an aspect of the present
`invention,
`invention,
`there is provided a magnetic field shield sheet for a wireless
`the magnetic field shield sheet comprising:
`charger,
`sheet made of an amor-
`at least one layer thin magnetic
`phous ribbon separated into a plurality of fine pieces;
`is adhered on one surface of the thin
`a protective film that
`magnetic sheet via a first adhesive layer provided on one side
`of the protective film; and
`is adhered on the other surface of
`a double-sided tape that
`the thin magnetic sheet via a second adhesive layer provided
`on one side of the double-sided adhesive tape,
`
`Petitioner Samsung and Google Ex-1007, 0015
`
`

`

`US 9,252,611 B2
`
`wherein gap s 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
`there
`invention,
`a magnetic field shield
`is provided a method of manufacturing
`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
`to thereby form a laminate
`ribbon,
`sheet;
`performing a flake treatment process of the laminate
`sheet
`to thus separate the thin magnetic sheet into a plurality of fine
`pieces; and
`laminating the flake treated laminate 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,
`is adhered on one surface of the thin
`a protective film that
`magnetic sheet via a first adhesive layer provided on one side
`of the protective film; and
`is adhered on the other surface of
`a double-sided tape that
`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
`device for the wireless charger,
`method from a transmission
`the reception device comprising:
`a secondary coil that receives a wireless high frequency
`by the electromagnetic
`induction method
`transmitted
`signal
`device; and
`from the transmission
`is disposed between the
`a magnetic field shield sheet
`that
`secondary coil and the secondary battery, and that shields a
`magnetic field generated by the wireless high frequency sig-
`induces the secondary coil to absorb
`nal and simultaneously
`signal necessary to perform a
`the wireless high frequency
`wireless charging function,
`wherein the magnetic field shield sheet comprises:
`sheet made of an amor-
`at least one layer thin magnetic
`phous ribbon separated into a plurality of fine pieces;
`is adhered on one surface of the thin
`a protective film that
`magnetic sheet via a first adhesive layer provided on one side
`of the protective film; and
`is adhered on the other surface of
`a double-sided tape that
`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
`
`As described above, the present
`invention provides a mag-
`netic field shield sheet for a wireless charger, which greatly
`a loss due to eddy currents
`reduces
`by a flake treatment
`process of an amorphous
`to thereby block an effect of
`ribbon,
`a magnetic field influencing upon a main body and a battery of
`to
`device and simultaneously
`a portable mobile
`terminal
`increase a quality factor (Q) of a secondary coil, and to thus
`electric power
`exhibit excellent
`a
`transmission
`efficiency,
`method of manufacturing
`the magnetic field shield sheet, and
`a receiver for the wireless charger by using the magnetic field
`shield sheet.
`
`6
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`10
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`26
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`30
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`46
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`60
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`60
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`66
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`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
`to thereby prevent water
`laminating process with an adhesive,
`all surfaces
`and which simultaneously
`penetration,
`surrounds
`of the fine pieces with an adhesive
`to thus
`(or a dielectric)
`isolate the fine pieces to thereby promote reduction
`mutually
`of eddy currents
`from
`performance
`shielding
`and prevent
`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-
`the amor-
`ribbon and to thus prevent
`ing into the amorphous
`phous ribbon from being oxidized and changes in appearance
`and characteristics
`from being deteriorated.
`invention provides a magnetic field
`Moreover,
`the present
`shield sheet for a wireless charger, which establishes
`a shape
`of a shield sheet
`to that of a coil of a
`into a shape similar
`receiving device for a wireless charger,
`to thereby exhibit a
`efficiency or equal power transmis-
`high power transmission
`sion efficiency while lowering thickness ofthe magnetic field
`to or less than 03 mm, even though a
`shield sheet to be equal
`small number of nanocrystalline
`are used, and a
`ribbons
`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-
`thickness of the sheet
`ing process to thus maintain original
`and to thus exhibit high productivity
`and inexpensive manu-
`facturing costs.
`
`DESCRIPTION OF DRAWINGS
`
`FIG. 1 is an exploded perspective view showing a magnetic
`for a wireless
`according to the
`field shield sheet
`charger
`invention.
`present
`view showing an example of
`FIG. 2 is a cross-sectional
`using one piece of nanocrystalline
`ribbon sheet according to
`a first embodiment of the present
`invention.
`view showing an example of
`FIG. 3 is a cross-sectional
`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 magnetic
`field shield sheet
`manufacturing
`charger according to the present
`invention.
`FIGS. S and 9 are cross-sectional views
`showing a flake
`treatment process of a laminate sheet according to the present
`respectively.
`invention,
`FIG. 10 is a cross-sectional view showing a state where a
`according to the present
`is flake-processed
`sheet
`laminate
`invention.
`FIGS. 11 and 12 are cross-sectional views showing a lami-
`nating process of a flake-treated laminate
`sheet according to
`the present
`respectively.
`invention,
`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
`
`a process of
`for a wireless
`
`Petitioner Samsung and Google Ex-1007, 0016
`
`

`

`US 9,252,611 B2
`
`after having performed
`a flake treatment
`process, but has
`test, and FIG. 14B is an enlarged pho-
`a humidity
`undergone
`tograph of a magnetic
`field shield sheet
`that has passed
`process after having performed a flake
`through a laminating
`test.
`a humidity
`treatment process and has undergone
`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
`device for a wireless
`is applied to a reception
`invention
`charger.
`FIG. 17 is an exploded perspective view showing that
`the
`charger of FIG. 16 is
`for a wireless
`reception
`device
`assembled with a battery cover and coupled with a portable
`terminal.
`FIG. 1S is a plan view showing a dual-antenna
`structure in
`for near field communications
`which an antenna
`(NFC) and
`for a wireless
`are formed by using a
`an antenna
`charger
`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.
`
`BEST MODE
`
`The above and other objects, features, and advantages of
`can be appreciated
`by the following
`the present
`invention
`description and will be understood more clearly by embodi-
`ment of the present
`it will be appreci-
`In addition,
`invention.
`ated that the objects and advantages of the present
`invention
`will be easily realized by means shown in the appended patent
`thereof Accordingly,
`the technical
`claims, and combinations
`spirit of the present
`invention can be easily implemented
`by
`one of ordinary skill
`in the art.
`if it is determined that
`the detailed description of
`Further,
`the known art related to the present
`invention makes the gist
`of the present
`obscure,
`a detailed
`unnecessarily
`invention
`description thereof will be omitted.
`FIG. 1 is an exploded perspective view showing a magnetic
`for a wireless
`according to the
`field shield sheet
`charger
`and FIG. 2 is a cross-sectional view show-
`present
`invention,
`ing an example of using one piece of nanocrystalline
`ribbon
`sheet according to a first embodiment of the present
`inven-
`tion.
`Referring to FIGS. 1 and 2, a magnetic field shield sheet 10
`for a wireless
`according to the present
`charger
`invention
`includes: at least one layer (or a multi-layer)
`thin magnetic
`sheet 2 separated and/or cracked into a plurality of fine pieces
`alloy ribbon or
`20, by thermally
`an amorphous
`treating
`alloy ribbon and then performing
`a flake
`nanocrystalline
`treatment process; a protective film 1 that
`is adhered on an
`upper portion of the thin magnetic
`sheet 2; a double-sided
`is adhered on a lower portion of the thin magnetic
`tape 3 that
`sheet 2; and a release film 4 that
`is separably adhered on a
`lower portion of the double-sided tape 3.
`For example, a thin ribbon made of an amorphous
`alloy or
`alloy may be used as the thin magnetic sheet
`nanocrystalline
`2.
`
`A Fe-based or Co-based magnetic
`alloys may be used as
`alloy, and considering the material cost, the
`the amorphous
`Fe-based magnetic alloys are preferably used.
`Si B alloys may be used as the Fe-
`For example, Fe
`based magnetic alloys. Here,
`it is preferable that
`the content
`of Fe is 70-90 atomic % (which will be abbreviated as at %),
`
`6
`
`10
`
`16
`
`20
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`26
`
`30
`
`36
`
`40
`
`46
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`60
`
`66
`
`60
`
`66
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`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,
`state. Thus,
`to form an amorphous
`it is difficult
`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,
`such as Cr and Co can be added
`corrosion resistant elements
`and if necessary,
`within 20 at % into this basic composition,
`other metallic elements may be included in small quantities
`in
`the basic composition to impart different properties.
`Si B alloys can be used; for example,
`The Fe
`the crys-
`Si B alloy is 508'
`tallization temperature of a certain Fe
`(Tc) thereof is 399' C. How-
`C., and the Curie temperature
`can be varied depending
`ever, the crystallization
`temperature
`on the content of Si and B, or the other metal elements and the
`thereof added in addition to ternary alloy elements.
`content
`Si B
`alloy, for example, a Fe
`A Fe-based amorphous
`Co-based alloy may be used according to the required condi-
`in the present
`invention.
`tions,
`a thin ribbon made of a Fe-based nanocrystal-
`Meanwhile,
`line magnetic alloy can be used as the thin magnetic sheet 2.
`An alloy satisfying the following Equation I is preferably
`used as the Fe-based nanocrystalline magnetic alloy.
`
`Fetoo a,&~,DaE,Sing„
`Equation 1
`In Equation I, 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
`an element E is at least one element
`selected from
`elements,
`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,
`that satisfy the fo