`US009252611B2
`
`c12) 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 FORA WIRELESS 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 ofthis
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 36 days.
`
`(21) Appl. No.:
`
`14/366,439
`
`(22) PCT Filed:
`
`Dec. 21, 2012
`
`(86) PCT No.:
`
`PCT /KR2012/011256
`
`§ 371 (c)(l),
`(2) Date:
`
`Jun.18,2014
`
`(87) PCT Pub. No.: WO2013/095036
`PCT Pub. Date: Jun. 27, 2013
`
`(65)
`
`(30)
`
`Prior Publication Data
`US 2015/0123604Al
`May 7, 2015
`
`Foreign Application Priority Data
`
`Dec. 21, 2011
`
`(KR) ........................ 10-2011-0138987
`
`(51)
`
`Int. Cl.
`H0lM 10144
`H0lM 10146
`
`(2006.01)
`(2006.01)
`(Continued)
`
`(52) U.S. Cl.
`CPC ............... H02J 710042 (2013.01); B32B 37112
`(2013.01); B32B 37118 (2013.01);
`
`(Continued)
`
`(58) Field of Classification Search
`CPC ......... H02J 5/005; H02J 7/025; H02J 7/0042;
`H02J 7/355; H0lF 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 ......................... HOlF 3/02
`360/125.01
`
`(Continued)
`
`FOREIGN PATENT DOCUMENTS
`
`JP
`KR
`
`10/2006
`2006269536
`2/2003
`1020030013831
`(Continued)
`OTHER PUBLICATIONS
`International Search Report-PCT/KR2012/011256 dated Mar. 18,
`2013.
`Primary Examiner - Edward Tso
`(74) Attorney, Agent, or Firm - Cantor Colburn LLP
`ABSTRACT
`(57)
`Provided are a magnetic field shield sheet for a wireless
`charger, which blocks an effect of an alternating-current mag(cid:173)
`netic field generated when a charger function for a portable
`mobile terminal device is implemented in a non-contact wire(cid:173)
`less manner on a main body of the portable mobile terminal
`device and exhibits excellent electric power transmission effi(cid:173)
`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(cid:173)
`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
`
`5
`
`Ex.1019
`APPLE INC. / Page 1 of 26
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`
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`US 9,252,611 B2
`Page 2
`
`(51)
`
`(52)
`
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`(2006.01)
`
`Int. Cl.
`H02J7/00
`H0JF 38/14
`H0JF 27136
`B32B 37112
`B32B 37118
`B32B 38/00
`H02J 7102
`H02J5/00
`U.S. Cl.
`CPC ......... B32B 38/0004 (2013.01); H0JF 271365
`(2013.01); H0JF 38/14 (2013.01); H02J 51005
`(2013.01); H02J 71025 (2013.01)
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`5,227,727 A * 7/1993 Segawa .................. G01R33/36
`324/318
`5,680,046 A * 10/1997 Frederick ............. G0lR 33/422
`324/318
`
`FOREIGN PATENT DOCUMENTS
`
`KR
`KR
`KR
`KR
`
`1020030051394
`1020030086122
`1020100031139
`101399024
`
`6/2003
`11/2003
`3/2010
`5/2014
`
`* cited by examiner
`
`Ex.1019
`APPLE INC. / Page 2 of 26
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`
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`U.S. Patent
`
`Feb.2,2016
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`Sheet 1 of 11
`
`US 9,252,611 B2
`
`FIG. 1
`
`10
`
`FIG. 2
`
`10a
`
`11}1
`/----------------\.--------- 12
`
`21
`\:::==+=====-:=;=;~ 3;/3
`-------31
`-33)
`~ /~4
`-------
`
`20
`
`Ex.1019
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`U.S. Patent
`
`Feb.2,2016
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`Sheet 2 of 11
`
`US 9,252,611 B2
`
`FIG. 3
`
`10b
`
`1
`21
`22
`23
`24
`25
`26
`4
`
`3a 3b 3c 3d 3e 3f
`
`20
`
`FIG. 4
`
`~-------~·-------11}1
`l===============r-----12
`4a
`
`FIG. 5
`
`1===============1~~
`
`4
`
`Ex.1019
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`U.S. Patent
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`Feb.2,2016
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`Sheet 3 of 11
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`US 9,252,611 B2
`
`FIG. 6
`
`10c
`
`1a
`
`Ex.1019
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`U.S. Patent
`
`Feb.2,2016
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`Sheet 4 of 11
`
`US 9,252,611 B2
`
`FIG. 7
`
`START
`
`PREPARE AlvtORPHOUS RIBBON
`
`CUT THE AMORPHOlJS RIBBON IN A SHEET FORM
`
`HEAT TREAT AMORPHOUS RIBBON SHEET
`
`S11
`
`S12
`
`S13
`
`LAMINATE RIBBON SHEET BETWEEN PROTECT! V
`EFILM AND DOUBLE-SIDED TAP AND THEN
`PERFORM FLAKE TREATMENT
`
`S14
`
`PERFORM LAMINATION TREATMENT
`
`STAMP LAMINATE SHEET
`IN A DESJRED SIZE AND SHAPE
`
`S15
`
`S16
`
`END
`
`Ex.1019
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`U.S. Patent
`
`Feb.2,2016
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`Sheet 5 of 11
`
`US 9,252,611 B2
`
`FIG. 8
`
`110
`I
`
`FIG. 9
`
`114
`
`120
`I
`
`126
`
`122
`
`100
`
`124
`
`Ex.1019
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`U.S. Patent
`
`Feb.2,2016
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`Sheet 6 of 11
`
`US 9,252,611 B2
`
`FIG. 10
`
`200
`
`FIG. 11
`
`400
`
`!
`
`210
`
`200
`
`220
`
`Ex.1019
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`U.S. Patent
`
`Feb.2,2016
`
`Sheet 7 of 11
`
`US 9,252,611 B2
`
`FIG. 12
`
`500
`I
`
`250
`(
`
`FIG. 13
`
`10
`
`Ex.1019
`APPLE INC. / Page 9 of 26
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`U.S. Patent
`
`Feb.2,2016
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`Sheet 8 of 11
`
`US 9,252,611 B2
`
`FIG. 14A
`
`FIG. 14B
`
`Ex.1019
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`U.S. Patent
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`Feb.2,2016
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`Sheet 9 of 11
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`US 9,252,611 B2
`
`FIG. 15A
`
`35 ;
`- - -35a 35c 35b
`
`FIG. 158
`
`35 ;
`
`r-;-------------::-7
`
`I
`
`I
`
`I
`
`I
`
`I
`
`I
`
`I
`
`I
`
`__,/ 35a
`/ ~
`
`.,,.-
`
`~ 35b
`
`I
`
`I
`
`I
`
`I
`
`I
`
`I
`
`I
`
`I
`
`I
`L.:: _____________ :'.J
`
`Ex.1019
`APPLE INC. / Page 11 of 26
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`
`
`U.S. Patent
`
`Feb.2,2016
`
`Sheet 10 of 11
`
`US 9,252,611 B2
`
`FIG. 16
`
`FIG. 17
`
`Ex.1019
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`
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`U.S. Patent
`
`Feb.2,2016
`
`Sheet 11 of 11
`
`US 9,252,611 B2
`
`FIG. 18
`
`43
`
`47c 41
`
`478
`
`/40
`
`41b
`
`45b
`
`49 45a
`
`FIG. 19
`
`BATTERY
`
`7
`10
`----6
`9
`,---~-----~-------,
`
`TRANSMISSION DEVICE
`
`8
`
`Ex.1019
`APPLE INC. / Page 13 of 26
`
`
`
`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
`
`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(cid:173)
`netic field generated when a charger function for a portable
`mobile terminal device is implemented in a non-contact wire(cid:173)
`less manner on a main body of the portable mobile terminal
`device and exhibits excellent electric power transmission effi(cid:173)
`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
`
`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
`10 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(cid:173)
`consuming problem may be caused for charging the elec-
`15 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
`20 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(cid:173)
`der is used as the magnetic field shield sheet. An effect of
`25 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(cid:173)
`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
`35 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
`40 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 PatentApplication 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. 10-2010-31139, 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
`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(cid:173)
`side spiral coil from interlinking a circuit board and a second(cid:173)
`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(cid:173)
`toresistance of a first magnetic sheet adjacent to the spiral coil
`is less than or equal to 60, second magnetoresistance of a
`
`50
`
`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(cid:173)
`ing method. The contact type charging method carries out a
`charging operation by making an electrode of a power recep- 30
`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(cid:173)
`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 45
`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(cid:173)
`strate by mixing ferrite powder and amorphous powder and 55
`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 60
`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 65
`by printing a metal powder paste as a coil have been
`employed. A structure of strengthening a coupling of a planar
`
`Ex.1019
`APPLE INC. / Page 14 of 26
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`US 9,252,611 B2
`
`4
`solving the heat generation problem due to shields and
`improving the wireless charging efficiency. Thus, the present
`inventors recognized that inductance (magnetic permeabil(cid:173)
`ity) is less reduced and magnetoresistance is greatly reduced,
`5 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
`
`3
`second magnetic sheet laminated on the first magnetic sheet is
`greater than or equal to 100, and a value of the second mag(cid:173)
`netoresistance divided by the first magnetoresistance is equal
`to or greater than 1.0.
`The first magnetic sheet is prepared by bonding polycar(cid:173)
`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 10
`first magnetic sheet and the second magnetic sheet are inte(cid:173)
`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 15
`performance of such low magnetic permeability, thickness of
`the ferrite sheet or a polymer sheet becomes large compared
`to the thin amorphous ribbon of several tens µm. Therefore, it
`is difficult to respond to a thinning tendency of terminals.
`Further, in the case of amorphous ribbon with high mag- 20
`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(cid:173)
`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 ofreducing 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, 30
`in the case that a processing treatment such as a flake treat(cid:173)
`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 orderof
`0.5 Tor 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 55
`becomes large as the amount of a soft magnetic material
`contained in the secondary coil becomes large and the mag(cid:173)
`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 60
`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
`
`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(cid:173)
`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 power transmission 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(cid:173)
`nating process by using a roll-to-roll method, to thereby
`50 achieve a sheet molding process to thus maintain original
`thickness of the sheet and to thus exhibit high productivity
`and inexpensive manufacturing costs.
`
`35
`
`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(cid:173)
`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,
`
`65
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`Ex.1019
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`US 9,252,611 B2
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`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
`10 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(cid:173)
`ing into the amorphous ribbon and to thus prevent the amor(cid:173)
`phous ribbon from being oxidized and changes in appearance
`15 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
`20 high power transmission efficiency or equal power transmis(cid:173)
`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(cid:173)
`forms a flake treatment process and a laminating process by
`using a roll-to-roll method, to thereby achieve a sheet mold(cid:173)
`ing process to thus maintain original thickness of the sheet
`30 and to thus exhibit high productivity and inexpensive manu(cid:173)
`facturing costs.
`
`DESCRIPTION OF DRAWINGS
`
`5
`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.
`According to another aspect of the present invention, there
`is provided a method of manufacturing a magnetic field shield 5
`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 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(cid:173)
`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 25
`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(cid:173)
`nal and simultaneously induces the secondary coil to absorb
`the wireless high frequency signal necessary to perform a 40
`wireless charging function,
`wherein the magnetic field shield sheet comprises:
`at least one layer thin magnetic sheet made of an amor(cid:173)
`phous ribbon separated into a plurality of fine pieces;
`a protective film that is adhered on one surface of the thin 45
`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.
`
`35
`
`50
`
`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(cid:173)
`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
`55 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(cid:173)
`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(cid:173)
`processed and then laminated.
`FIG. 14A is an enlarged photograph of a magnetic field
`shield sheet that has not passed through a laminating process
`
`Advantageous Effects
`
`As described above, the present invention provides a mag(cid:173)
`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 60
`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 65
`a receiver for the wireless charger by using the magnetic field
`shield sheet.
`
`Ex.1019
`APPLE INC. / Page 16 of 26
`
`
`
`US 9,252,611 B2
`
`5
`
`7
`after having performed a flake treatment process, but has
`undergone a humidity test, and FIG. 14B is an enlarged pho(cid:173)
`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- 10
`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 15
`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 20
`flexible printed circuit board (FPCB).
`FIG.19 is a schematic diagram showing a measuring struc(cid:173)
`ture for testing the efficiency and temperature characteristics
`of a magnetic field shield sheet according to the present
`invention.
`
`25
`
`BEST MODE
`
`8
`and the content ofa sum of Si andB is 10-30 at%. The higher
`content of Fe and other metals may be, the higher the satura(cid:173)
`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
`of an alloy is the most excellent. In order to prevent corrosion,
`corrosion resistant elements such as Cr and 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-B alloys can be used; for example, the crys(cid:173)
`tallization temperature of a certain Fe-Si-B alloy is 508°
`C., and the Curie temperature (Tc) thereof is 399° C. How(cid:173)
`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(cid:173)
`tions, in the present invention.
`Meanwhile, a thin ribbon made of a Fe-based nanocrystal(cid:173)
`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
`
`The above and other objects, features, and advantages of
`the present invention can be appreciated by the following 30
`description and will be understood more clearly by embodi(cid:173)
`ment of the present invention. In addition, it will be appreci(cid:173)
`ated that the objects and advantages of the present invention
`will be easily realized by means shown in the appended patent
`claims, and combinations thereof Accordingly, the technical 35
`spirit of the present invention can be easily implemented by
`one of ordinary skill in the art.
`Further, if it is determined that the detailed description of
`the known art related to the present invention makes the gist
`of the present invention unnecessarily obscure, a detailed 40
`description thereof will be omitted.
`FIG.1 isanexplodedperspectiveview showing a magnetic
`field shield sheet for a wireless charger according to the
`present invention, and FIG. 2 is a cross-sectional view show(cid:173)
`ing an example of using one piece ofnanocrystalline ribbon 45
`sheet according to a first embodiment of the present inven(cid:173)
`tion.
`Referring to FIGS.1 and 2, a magnetic field shield sheet 10
`for a wireless charger according to the present invention
`includes: at least one layer (or a multi-layer) thin magnetic 50
`sheet 2 separated and/or cracked into a plurality of fine pieces
`20, by thermally treating an amorphous alloy ribbon or