1111111111111111 IIIIII IIIII 1111111111 11111 11111 11111 111111111111111 11111 1111111111 11111111
`US 20100007215Al
`
`c19) United States
`c12) Patent Application Publication
`Sakuma
`
`c10) Pub. No.: US 2010/0007215 Al
`Jan. 14, 2010
`(43) Pub. Date:
`
`(54) SOFT MAGNETIC SHEET, MODULE
`INCLUDING THE SHEET AND
`NON-CONTACT POWER TRANSMISSION
`SYSTEM INCLUDING THE MODULE
`
`(75)
`
`Inventor:
`
`Sadakatsu Sakuma, Sendai-shi
`(JP)
`
`Correspondence Address:
`FRISHAUF, HOLTZ, GOODMAN & CHICK, PC
`220 Fifth Avenue, 16TH Floor
`NEW YORK, NY 10001-7708 (US)
`
`(73) Assignee:
`
`NEC TOKIN Corporation,
`Sendai-shi (JP)
`
`(21) Appl. No.:
`
`12/499,215
`
`(22) Filed:
`
`Jul. 8, 2009
`
`(30)
`
`Foreign Application Priority Data
`
`(JP) ................................. 2008-180583
`Jul. 10, 2008
`Sep.26,2008
`(JP) ................................. 2008-247346
`Publication Classification
`
`(51)
`
`Int. Cl.
`HOJF 38/14
`(2006.01)
`HOJF 3/10
`(2006.01)
`(52) U.S. Cl. ......................................... 307/104; 335/297
`ABSTRACT
`(57)
`
`A non-contact power transmission system comprises a power
`receiver and a power transmitter. The power transmitter
`includes a transmitter coil. The power receiver includes a
`module which comprises a coil sheet and a soft magnetic
`sheet stacked on the coil sheet. The coil sheet includes a
`receiver coil. Electric power is transmitted from the transmit(cid:173)
`ter coil to the receiver coil. The soft magnetic sheet comprises
`a pair of insulation films and a soft magnetic member her(cid:173)
`metically interposed between the insulation films.
`
`23a
`
`45
`
`13a /.
`
`12
`
`2 3 - -,,,_~-=::--=:--:=--=::::-ir------'
`22-------n-
`21
`
`11(31)
`12(33)
`13
`
`21
`
`24
`
`Petitioner Samsung and Google
`Ex-1005, 0001
`
`

`

`Patent Application Publication
`
`Jan. 14, 2010 Sheet 1 of 8
`
`US 2010/0007215 Al
`
`23a
`
`13a
`
`FIG.1
`
`11(31)
`
`12(33)
`13
`
`21
`
`24
`
`Petitioner Samsung and Google
`Ex-1005, 0002
`
`

`

`Patent Application Publication
`
`Jan. 14, 2010 Sheet 2 of 8
`
`US 2010/0007215 Al
`
`31
`
`311
`
`311
`
`311
`
`FIG.2A
`
`12(33)
`
`FIG.2B
`
`Petitioner Samsung and Google
`Ex-1005, 0003
`
`

`

`Patent Application Publication
`
`Jan. 14, 2010 Sheet 3 of 8
`
`US 2010/0007215 Al
`
`31c
`
`31d
`
`31d
`
`31c
`
`FIG.3A
`
`12(33)
`)
`
`FIG.3B
`
`Petitioner Samsung and Google
`Ex-1005, 0004
`
`

`

`Patent Application Publication
`
`Jan. 14, 2010 Sheet 4 of 8
`
`US 2010/0007215 Al
`
`~
`-----------------
`
`12
`
`33
`
`41
`
`41
`
`42
`
`34
`
`41
`
`11
`
`~
`
`32
`
`41
`
`31
`
`44
`
`41
`
`41
`
`FIG.4
`
`Petitioner Samsung and Google
`Ex-1005, 0005
`
`

`

`Patent Application Publication
`
`Jan. 14, 2010 Sheet 5 of 8
`
`US 2010/0007215 Al
`
`12
`
`34
`
`33
`
`31a1
`
`FIG.SA
`
`31a1
`
`FIG.SB
`
`31a2
`
`- 1 1
`
`45
`
`31a2
`
`- 1 1
`
`45
`
`31a1
`
`31a1
`
`FIG.SC
`
`Petitioner Samsung and Google
`Ex-1005, 0006
`
`

`

`Patent Application Publication
`
`Jan. 14, 2010 Sheet 6 of 8
`
`US 2010/0007215 Al
`
`51
`
`11
`~
`55
`
`32
`
`32
`
`32
`
`52
`
`FIG.6A
`
`32 7 (cid:143)
`
`1'--~~~____,J
`11m ---...::-6;.;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;~~
`51----
`
`32
`
`_.1.;;;;;;;;;;;;;;==.-====;::===~-
`32
`52
`32
`
`32
`
`32
`
`FIG.6B
`
`Petitioner Samsung and Google
`Ex-1005, 0007
`
`

`

`Patent Application Publication
`
`Jan. 14, 2010 Sheet 7 of 8
`
`US 2010/0007215 Al
`
`34 12 M:563
`
`~
`
`~
`
`51
`
`32
`
`32
`
`32
`
`11m~
`
`32
`
`32
`
`61 54
`
`FIG.7
`
`Petitioner Samsung and Google
`Ex-1005, 0008
`
`

`

`Patent Application Publication
`
`Jan. 14, 2010 Sheet 8 of 8
`
`US 2010/0007215 Al
`
`FIG.BA
`
`FIG.BB
`
`52
`
`51
`
`FIG.BC
`
`Petitioner Samsung and Google
`Ex-1005, 0009
`
`

`

`US 2010/0007215 Al
`
`Jan. 14, 2010
`
`1
`
`SOFT MAGNETIC SHEET, MODULE
`INCLUDING THE SHEET AND
`NON-CONTACT POWER TRANSMISSION
`SYSTEM INCLUDING THE MODULE
`
`CROSS REFERENCE TO RELATED
`APPLICATIONS
`
`[0001] An applicant claims priority under 35 U.S.C. §119
`of Japanese Patent Application No. JP2008-l 80583 filed Jul.
`10, 2008 and Japanese Patent Application No. JP2008-
`247346 filed Sep. 26, 2008.
`
`BACKGROUND OF THE INVENTION
`
`[0002] This invention relates to anon-contact orcontactless
`power transmission system based on electromagnetic induc(cid:173)
`tion between coils.
`[0003] One of the non-contact or contactless power trans(cid:173)
`mission systems comprises a power receiver and a power
`transmitter. The power receiver includes a receiver coil, while
`the power transmitter includes a transmitter coil. Without
`direct contact between the transmitter coil and the receiver
`coil, electric power is transmitted from the transmitter coil to
`the receiver coil on the basis of the electromagnetic induction
`caused therebetween. For example, such non-contact power
`transmission system is used in a power supply system for
`supplying electric power to an artificial heart. Other appli(cid:173)
`cable arts are a power supply system for a hand-held device,
`an IC tag system, a battery charger system and so on.
`[0004] Effective power transmission system is disclosed in
`JP-A 2003-45731, the contents of which are incorporated
`herein by reference. The disclosed power transmission sys(cid:173)
`tem comprises two coils, i.e. a receiver coil and a transmitter
`coil, and a ferrite sheet. The ferrite sheet includes a plurality
`of soft magnetic ferrite chips and is arranged on an outside of
`one of the coils.
`[0005] Recently, a non-contact power transmission system,
`especially a power receiver is required to have a low-profile.
`For the low-profile requirement, a soft magnetic sheet such as
`the above-mentioned disclosed sheet is also required to be
`thinned. However, a thin soft magnetic sheet may be break(cid:173)
`able when a force is applied to the soft magnetic sheet; if the
`soft magnetic sheet is broken, magnetic powder is scattered
`from the broken sheet within/out of the power receiver. There
`is a need for a thin soft magnetic sheet which is used for a
`power receiver of a non-contact power transmission system
`and which can prevent scattering of magnetic power even
`when a force is applied to the soft magnetic sheet.
`
`SUMMARY OF THE INVENTION
`
`[0006] One aspect of the present invention provides a soft
`magnetic sheet comprising a pair of insulation films and a soft
`magnetic member hermetically interposed between the insu(cid:173)
`lation films.
`[0007] Another aspect of the present invention provides a
`module which comprises the above-mentioned soft magnetic
`sheet and a coil sheet stacked on the soft magnetic sheet, the
`coil sheet comprising a coil.
`[0008] Another aspect of the present invention provides a
`non-contact power transmission system which comprises a
`power receiver and a power transmitter, the power receiver
`comprising the above-mentioned module.
`[0009] An appreciation of the objectives of the present
`invention and a more complete understanding of its structure
`
`may be had by studying the following description of the
`preferred embodiment and by referring to the accompanying
`drawings.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`[0010] FIG. 1 is a cross-sectional view schematically show(cid:173)
`ing a part of a non-contact power transmission system accord(cid:173)
`ing to an embodiment of the present invention, wherein the
`non-contact power transmission system comprises a power
`transmitter and a power receiver.
`[0011] FIG. 2A is a perspective view schematically show(cid:173)
`ing a soft magnetic sheet of the power receiver of FIG. 1.
`[0012] FIG. 2B is a perspective view schematically show(cid:173)
`ing a part of the power receiver of FIG. 1, the power receiver
`including the soft magnetic sheet of FIG. 2A.
`[0013] FIG. 3A is a perspective view schematically show(cid:173)
`ing a modification of the soft magnetic sheet of FIG. 2A.
`[0014] FIG. 3B is a perspective view schematically show(cid:173)
`ing a modification of the power receiver of FIG. 2B, the power
`receiver including the soft magnetic sheet of FIG. 3A.
`[0015] FIG. 4 is an exploded, perspective view schemati(cid:173)
`cally showing a modification of the power receiver of FIG. 1.
`[0016] FIG. SA is a cross-sectional view schematically
`showing a modification of the power receiver of FIG. 1
`[0017] FIG. SB is a cross-sectional view schematically
`showing another modification of the powerreceiverofFIG.1.
`[0018] FIG. SC is a cross-sectional view schematically
`showing another modification of the powerreceiverofFIG.1.
`[0019] FIG. 6A is a cross-sectional view schematically
`showing a part of another modification of the power receiver
`of FIG. 1, wherein the illustrated part corresponds to the right
`part or the left part of FIG. SB or FIG. SC.
`[0020] FIG. 6B is a cross-sectional view schematically
`showing a part of another modification of the power receiver
`of FIG. 1, wherein the illustrated part corresponds to the right
`part or the left part of FIG. SB or FIG. SC.
`[0021] FIG. 7 is a cross-sectional view schematically show(cid:173)
`ing a part of another modification of the power receiver of
`FIG. 1, wherein the illustrated part corresponds to the right
`part or the left part of FIG. SB or FIG. SC.
`[0022] FIG. SA is a perspective view schematically show(cid:173)
`ing a modification of the soft magnetic sheet of FIG. 2A.
`[0023] FIG. SB is a perspective view schematically show(cid:173)
`ing another modification of the soft magnetic sheet of FIG.
`2A.
`[0024] FIG. SC is a perspective view schematically show(cid:173)
`ing another modification of the soft magnetic sheet of FIG.
`2A.
`[0025] While the invention is susceptible to various modi(cid:173)
`fications and alternative forms, specific embodiments thereof
`are shown by way of example in the drawings and will herein
`be described in detail. It should be understood, however, that
`the drawings and detailed description thereto are not intended
`to limit the invention to the particular form disclosed, but on
`the contrary, the intention is to cover all modifications,
`equivalents and alternatives falling within the spirit and scope
`of the present invention as defined by the appended claims.
`
`DESCRIPTION OF PREFERRED
`EMBODIMENTS
`[0026] With reference to FIG. 1, a non-contact or contact(cid:173)
`less power transmission system according to an embodiment
`of the present invention comprises a power receiver 1 and a
`power transmitter 2.
`
`Petitioner Samsung and Google
`Ex-1005, 0010
`
`

`

`US 2010/0007215 Al
`
`Jan. 14, 2010
`
`2
`
`[0027] The power receiver 1 comprises a soft magnetic
`sheet 11, a coil sheet 12, a receiver housing 13 and a circuit
`board 45. The soft magnetic sheet 11 is mounted on the circuit
`board 45. The coil sheet 12 is stacked on the soft magnetic
`sheet 11. The coil sheet 12 includes a receiver coil 33, as
`described later, which is connected to a circuit pattern formed
`on the circuit board 45. The receiver housing 13 is made of
`insulator and accommodates the soft magnetic sheet 11, the
`coil sheet 12 and the circuit board 45.
`[0028] With reference to FIGS. 2A and 2B, the soft mag(cid:173)
`netic sheet 11 comprises a pair of insulation films 32 and a
`soft magnetic member 31, wherein the insulation films 32 are
`partially omitted in FIG. 2B for the sake of better understand(cid:173)
`ing. The soft magnetic member 31 of the present embodiment
`is fixed between the insulation films 32. Specifically, the soft
`magnetic member 31 is hermetically interposed between the
`insulation films 32. In other words, the soft magnetic member
`31 has a laminate structure. Each of the insulation films 32 is
`made of a polyester film. However, the present invention is
`not limited thereto. The insulation film 32 may be made of
`other materials.
`[0029] The soft magnetic member 31 of the present
`embodiment comprises ten soft magnetic pieces 311. Each of
`the soft magnetic pieces 311 has a small tile shape. However,
`the present invention is not limited thereto. The soft magnetic
`piece may have other shapes such as triangle and so on. In
`addition, the soft magnetic pieces 311 have the same shapes
`as each other. However, the present invention is not limited
`thereto. For example, as shown in FIGS. 3A and 3B, the soft
`magnetic member may be comprised of soft magnetic pieces
`3 lc, 3 ld, wherein the insulation films 32 are partially omitted
`in FIG. 3B for the sake of better understanding. Each of the
`soft magnetic pieces 31c has a rectangular shape. Each of the
`soft magnetic pieces 3 ld has a similar shape to the soft mag(cid:173)
`netic piece 31c but is formed with a depression which gener(cid:173)
`ally has a half circle. The soft magnetic pieces 31d with
`depressions are arranged so as to form a circular depression
`which is positioned at a center section of the soft magnetic
`member. The depression may have any other shape.
`[0030] The soft magnetic pieces 311 of the present embodi(cid:173)
`ment are arranged in one layer so as to constitute a single loop
`so that the soft magnetic member 31 has a center section
`which does not contain any soft magnetic piece 311. At the
`center section, the insulation films 31 are directly fixed to
`each other. The insulation films 31 may be formed with an
`opening at the center section.
`[0031] The coil sheet 12 comprises two insulation films and
`the receiver coil 33. The receiver coil 33 is hermetically
`interposed between the insulation films. In other words, the
`coil sheet 12 has a laminate structure so that the receiver coil
`33 is insulated from the outside of the receiver coil 33 by the
`insulation films. The material of the receiver coil 33 of the
`present embodiment is a litz wire, but the present invention is
`not limited to a specific material. The coil sheet 12 is attached
`to the soft magnetic sheet 11 so that an inside area of the
`receiver coil 33 corresponds to the center section of the soft
`magnetic sheet 11, as apparent from FIG. 2B. The coil sheet
`12 may have other structures. For example, the coil sheet may
`be formed as a printed circuit board in which a coil is printed
`on a substrate or board. The coil sheet may have a structure a
`discrete coil fixed on an insulation sheet. The coil sheet may
`consist of a discrete coil which is formed of turns of self(cid:173)
`welding wire.
`
`[0032] The receiver housing 13 is formed with a depression
`portion 13a. The depression portion 13a is positioned to
`correspond to the center section of the soft magnetic sheet 11.
`The depression portion 13a of the present embodiment has a
`rounded rectangular shape. However, the depression portion
`13a may have any shape.
`[0033] With reference to FIG. 1, the power transmitter 2
`comprises a soft magnetic sheet 21, a coil sheet 22, a trans(cid:173)
`mitter housing 23 and a circuit board 24 for supplying electric
`power. The soft magnetic sheet 21 has the same structure as
`the soft magnetic sheet 11. The coil sheet 22 has the same
`structure as the coil sheet 12, wherein the coil of the coil sheet
`22 is used as a transmitter coil. However, the soft magnetic
`sheet 21 and/or the coil sheet 22 may have other structures.
`The transmitter coil is connected to a circuit pattern formed
`on the circuit board 24. The electric power is transmitted from
`the transmitter coil of the coil sheet 22 to the receiver coil 33.
`[0034] The transmitter housing 23 is formed with a protu(cid:173)
`berant portion 23a which is fittable with the depression por(cid:173)
`tion 13a. The protuberant portion 23a is positioned to corre(cid:173)
`spond to the center section of the soft magnetic sheet 21.
`Upon the fitting of the protuberant portion 23a with the
`depression portion 13a, the receiver coil 33 and the transmit(cid:173)
`ter coil are arranged to surround the protuberant portion 23a
`and the depression portion 13a, while the transmitter coil of
`the coil sheet 22 is positioned in correspondence with the
`receiver coil 33 of the coil sheet 12, as shown in FIG. 1. The
`positional correspondence between the receiver coil 33 and
`the transmitter coil enhances power transmission efficiencies.
`In this embodiment, the depression portion 13a is formed as
`a part of the receiver housing 13, while the protuberant por(cid:173)
`tion 23a is formed as a part of the transmitter housing 23.
`Alternatively, the depression portion may be formed as a part
`of the transmitter housing 23, while the protuberant portion
`may be formed as a part of the receiver housing 13.
`[0035] The power receiver 1 may be modified as shown in
`FIG. 4. The illustrated circuit board 45 is provided with
`positioning marks 41. The insulation films 32 of the soft
`magnetic sheet 11 are also provided with positioning marks
`41. Likewise, the insulation films 34 of the coil sheet 12 are
`also formed with positioning marks 41. The positional corre(cid:173)
`spondence among the positioning marks 41 provides a suit(cid:173)
`able stacking of the circuit board 45, the soft magnetic sheet
`11 and the coil sheet 12. The positioning marks 41 may have
`any other shapes.
`[0036]
`In this modification, the circuit board 45 is provided
`with electronic components 44. In consideration of the elec(cid:173)
`tronic components 44, the soft magnetic sheet 11 and the coil
`sheet 12 are provided with cut-off like portions 42, 43, respec(cid:173)
`tively. Because of the cut-off like portions 42, 43, the soft
`magnetic sheet 11 and the coil sheet 12 are prevented from
`being undesirably bent when the soft magnetic sheet 11 and
`the coil sheet 12 are stacked on the circuit board 45.
`[0037]
`In the above-mentioned embodiment, both of the
`power receiver 1 and the power transmitter 2 comprise the
`respective soft magnetic sheets 11, 21. Depending upon its
`used environment, any one of the power receiver 1 and the
`power transmitter 2 may comprise a soft magnetic sheet.
`However, it is preferable that the power receiver 1 comprises
`the soft magnetic sheet 11.
`[0038]
`In the above-mentioned embodiment, the soft mag(cid:173)
`netic sheet comprises a uniform thickness of the soft mag(cid:173)
`netic member 31, and the number of the soft magnetic sheet is
`only one. However, the present invention is not limited
`
`Petitioner Samsung and Google
`Ex-1005, 0011
`
`

`

`US 2010/0007215 Al
`
`Jan. 14, 2010
`
`3
`
`thereto. For example, the soft magnetic sheet may have a
`mount portion and a surrounding portion, wherein the
`receiver coil of the coil sheet is mounted on the mount por(cid:173)
`tion, and the surrounding portion has a thickness larger than
`another thickness of the mount portion. The non-uniform
`thickness of the soft magnetic sheet is embodied in for
`example FIGS. SA to SC. The soft magnetic sheet 11 of FIG.
`SA comprises soft magnetic pieces 31al and soft magnetic
`pieces 31a2. Each of the soft magnetic pieces 3lal has a
`uniform thickness. On the other hand, each of the soft mag(cid:173)
`netic pieces 3la2 has an L-shaped cross-section, i.e. a non(cid:173)
`uniform thickness. The soft magnetic pieces 31al and the soft
`magnetic pieces 31a2 are arranged so that the soft magnetic
`sheet 11 has a thinner section and a thicker section, wherein
`the thinner section serves as the mount portion, while the
`thicker portion serves as the surrounding portion. The thicker
`portion, i.e. the surrounding portion enhances power trans(cid:173)
`mission characteristics.
`[0039] Although the soft magnetic sheet 11 ofFIG. SA does
`not have the above-mentioned center section, the soft mag(cid:173)
`netic sheet may have the center section even if the soft mag(cid:173)
`netic sheet has the surrounding portion. For example, the soft
`magnetic sheet 11 of FIG. 5B comprises soft magnetic pieces
`31al and soft magnetic pieces 3la2 which are arranged so
`that the soft magnetic sheet 11 has a thinner section and a
`thicker section, similar to FIG. SA. In addition, the soft mag(cid:173)
`netic sheet 11 of FIG. 5B is provided with the center section
`which does not contain any soft magnetic member. Further(cid:173)
`more, a similar structure of the soft magnetic sheet 11 may be
`formed of two soft magnetic sheets which have different
`shapes than each other, as shown in FIG. SC. In FIG. SC, each
`of the soft magnetic sheet lla and the soft magnetic sheet llb
`has a uniform thickness of the soft magnetic members. How(cid:173)
`ever, the soft magnetic member of the soft magnetic sheet llb
`has a large aperture in comparison with the soft magnetic
`sheet lla. Note here that the soft magnetic sheets ofFIGS. SA
`to SC are schematically illustrated so that the insulation films
`32 are not shown.
`[0040]
`Instead of the soft magnetic pieces the soft magnetic
`sheet 11 may have one or more soft magnetic plate. For
`example, the soft magnetic sheet 11 of FIG. 6A comprises
`two soft magnetic plates 51 and 52, which are bonded
`together by using an adhesive agent 55. It is preferable that the
`adhesive agent 55 has a small Young's modulus and a small
`contractibility upon hardening process. The illustrated soft
`magnetic plates 51 and 52 are made of materials different
`from each other. The module of FIG. 6B comprises three soft
`magnetic sheets llu, llm and 11 6 . The upper soft magnetic
`sheet llu has a frame shape. The middle soft magnetic sheet
`llm is made of a material same as that of the upper soft
`magnetic sheet llu but has a normal plate-like shape. The
`bottom soft magnetic sheet 11 6 is made of a material different
`from the middle soft magnetic sheet llm but has the same
`shape as the middle soft magnetic sheet llm. Note here that
`each of the modules of FIGS. 6A and 6B has a structure which
`has a thinner section and a thicker section similar to FI GS. SA
`to 5B.
`[0041] FIG. 7 shows another modification of the module.
`The module of FIG. 7 comprises two soft magnetic sheets
`llg, llP. The soft magnetic sheet llP has a normal sheet-like
`soft magnetic member 54. On the other hand, the soft mag(cid:173)
`netic sheet llg has a soft magnetic member 51 which is
`provided with a magnetic gap 61. The magnetic gap 61 is
`positioned just below the coil 33 so as to enhance the mag-
`
`netic saturation characteristic of the module of FIG. 7. It is
`preferable that the soft magnetic member 51 has a large
`permeability such as ferrite or metallic soft magnetic mate(cid:173)
`rial. The ferrite is for example Mn-Zn ferrite or Ni-Zn
`ferrite. The metallic soft magnetic material is for example
`sendust. The soft magnetic member 54 serves to prevent
`magnetic leakage. The soft magnetic member 54 is made of
`an electromagnetic interference suppression sheet which
`comprises sendust flakes dispersed and arranged into resin
`binder. The modification may be further modified in consid(cid:173)
`eration ofFIG. 6A. Specifically, the soft magnetic member 51
`and the soft magnetic member 54 are bonded together, and the
`whole members 51, 54 are hermetically interposed between
`two insulation films 32.
`[0042] Although the soft magnetic member 31 of the soft
`magnetic sheet 11 of FIG. 2A consists of the soft magnetic
`pieces 311 which are same as each other, the present invention
`is not limited thereto. The soft magnetic sheet may consist of
`two or more kinds of soft magnetic pieces, depending upon its
`used environment. In detail, if high insulation is required only
`in a particular region, soft magnetic pieces with higher insu(cid:173)
`lation characteristic should be used for the particular region.
`For example, between Mn-Zn based ferrite and Ni-Zn
`based ferrite, Ni-Zn based ferrite should be used for the
`particular region; instead, Mn-Zn based ferrite may be used
`for the other region other than the particular region. Likewise,
`if heat generation components are arranged only on a specific
`region, soft magnetic pieces with higher Curie points should
`be used for the specific region. For example, between
`Mn-Zn based ferrite and Ni-Zn based ferrite, Ni-Zn
`based ferrite should be used for the specific region; instead,
`Mn-Zn based ferrite may be used for the other region other
`than the specific region.
`[0043]
`In FIG. SA, two kinds of soft magnetic pieces 51, 52
`are used. The soft magnetic pieces 52 are arranged only on
`one side edge; the other area are occupied by the other soft
`magnetic pieces 51. This is the case which has the particular
`region or the specific region as mentioned above. In FIG. SB,
`two kinds of soft magnetic pieces 51, 52 are used but are
`arranged in a checkered flag pattern so that their magnetic
`characteristics are averaged. In addition, the soft magnetic
`sheet of FIG. SC comprises two layers of soft magnetic
`pieces. In this embodiment, the number of the soft magnetic
`pieces of the upper layer is equal to the number of the soft
`magnetic pieces of the lower layer. In other words, the soft
`magnetic pieces belonging to the upper layer is equal in
`number to the soft magnetic pieces belonging to the lower
`layer. The lower layer comprises two kinds of soft magnetic
`pieces 51, 52 are used but are arranged in a checkered flag
`pattern, similar to FIG. SB. The upper layer comprises one
`kind of soft magnetic pieces 53.
`
`Example 1
`
`[0044] The non-contact power transmission system accord(cid:173)
`ing to an example 1 was fabricated and evaluated. The present
`example 1 is based on FIGS. 1, 2A and 2B. Each of the soft
`magnetic pieces 311 was made of sintered spinelle ferrite
`which had permeability of about 2500 and saturation magne(cid:173)
`tization of about 0.5 T (5000 G). The size of each piece 311 is
`11 mmx 11 mmx 1 mm. The insulation films 32 were made of
`polyester films. The soft magnetic sheet 21 had a structure
`same as the soft magnetic sheet 11. The receiver coil was
`formed of five turns oflitz wire, which was formed of a bundle
`often copper-based self welding wires each having a diam-
`
`Petitioner Samsung and Google
`Ex-1005, 0012
`
`

`

`US 2010/0007215 Al
`
`Jan. 14, 2010
`
`4
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`eter of 100 µm. The receiver coil had a rectangular loop shape
`which had an outer size of 35 mmx25 mm while having an
`inner size of25 mmxl 5 mm; the thickness of the receiver coil
`was 1.5 mm. The receiver coil was interposed between the
`insulation films of polyester. The coil sheet 22 had a structure
`same as the coil sheet 12. The protuberant portion 23a had a
`shape of3 mmx18.5 mmx8.5 mm, while the depression por(cid:173)
`tion 13a had a shape of 3 mmx20 mmxl0 mm. Under the
`conditions of frequency of 100 kHz and a primary voltage
`level of 4 V, a secondary voltage level P2 and its transforma(cid:173)
`tion efficiency ri was evaluated, where ri=( output power/input
`power)xl00 (%). The evaluated secondary voltage level P2
`was 8 W, while the evaluated transformation efficiency ri was
`58%. These evaluated values show good power transmission
`capability.
`
`Example 2
`
`[0045] Similar evaluation was carried out for the case of
`FIGS. 3A and 3B. The soft magnetic piece 31c had a size of
`35 mmxl 1 mmxl mm. The half circle shaped depression of
`the soft magnetic piece 31d had a radius of 5 mm. The other
`conditions were same as those of the above-mentioned
`example 1. The evaluated secondary voltage level P2 was 8 W,
`while the evaluated transformation efficiency ri was 59%
`These evaluated values show good power transmission capa(cid:173)
`bility.
`
`Example 3
`
`[0046] Similar evaluation was carried out for the case of
`FIG. 5B. The thinner portion had a thickness of 1 mm. The
`thicker portion had a thickness of 2.5 mm. The other condi(cid:173)
`tions were same as those of the above-mentioned example 1.
`The evaluated secondary voltage level P2 was 8 W, while the
`evaluated transformation efficiency ri was 68%. As under(cid:173)
`stood from the evaluation, the thicker portion enhances the
`transformation efficiency ri.
`
`Example 4
`
`[0047] Evaluation was carried out for the case of FIG. 7.
`The soft magnetic member 51 was made of Mn-Zn ferrite
`andhadashapeofll mmx5mmxl mm. The magnetic gap 61
`of the soft magnetic member 51 was 1 mm. The soft magnetic
`member 54 was made of an electromagnetic interference
`suppression sheet which comprised sendust power dispersed
`in resin binder. The magnetic gap 61 prevented magnetic
`saturation, while the electromagnetic interference suppres(cid:173)
`sion sheet prevented magnetic leakage. In addition, the soft
`magnetic sheet was allowed to have a radius of curvature of30
`mm.
`[0048] The present application is based on Japanese patent
`applications of JP2008-180583 and JP2008-247346 filed
`before the Japan Patent Office on Jul. 10, 2008 and Sep. 26,
`2008, respectively, the contents of which are incorporated
`herein by reference.
`[0049] While there has been described what is believed to
`be the preferred embodiment of the invention, those skilled in
`the art will recognize that other and further modifications may
`be made thereto without departing from the spirit of the
`invention, and it is intended to claim all such embodiments
`that fall within the true scope of the invention.
`
`What is claimed is:
`1. A soft magnetic sheet comprising:
`a pair of insulation films; and
`a soft magnetic member fixed between the insulation films.
`2. The soft magnetic sheet according to claim 1, wherein
`the soft magnetic member is hermetically interposed between
`the insulation films.
`3. The soft magnetic sheet according to claim 1, wherein
`the soft magnetic member comprises two or more soft mag(cid:173)
`netic pieces.
`4. The soft magnetic sheet according to claim 3, wherein
`the soft magnetic pieces are arranged in one layer.
`5. The soft magnetic sheet according to claim 3, wherein
`the soft magnetic pieces are arranged in two or more layers,
`each of layers comprising two or more of the soft magnetic
`pieces.
`6. The soft magnetic sheet according to claim 5, wherein
`the soft magnetic pieces belonging to one of the layers are
`equal in number to the soft magnetic pieces belonging to
`another one of the layers.
`7. The soft magnetic sheet according to claim 3, wherein
`the soft magnetic pieces are grouped into at least two groups,
`the groups being made of materials different from each other.
`8. The soft magnetic sheet according to claim 1, wherein
`the soft magnetic member comprises two or more soft mag(cid:173)
`netic plates which are stacked each other.
`9. The soft magnetic sheet according to claim 8, wherein
`the soft magnetic plates are grouped into at least two groups,
`the groups being made of materials different from each other.
`10. The soft magnetic sheet according to claim 2, including
`a center section which does not contain the soft magnetic
`member at which the insulation films are directly fixed to each
`other.
`11. A module comprising the soft magnetic sheet according
`to claim 1 and a coil sheet stacked on the soft magnetic sheet,
`the coil sheet comprising a coil.
`12. The module according to claim 11, wherein the coil
`sheet is a laminate structure comprising two films and the coil
`hermetically interposed therebetween.
`13. The module according to claim 11, wherein the soft
`magnetic sheet including a mount portion and a surrounding
`portion, the coil being positioned on the mount portion, the
`surrounding portion having a thickness larger than another
`thickness of the mount portion.
`14. A non-contact power transmission system comprising a
`power receiver and a power transmitter, the power receiver
`comprising the module according to claim 11.
`15. The non-contact power transmission system according
`to claim 14, wherein: the power receiver comprises a receiver
`housing; the power transmitter comprises a transmitter hous(cid:173)
`ing; one of the receiver housing and the transmitter housing is
`provided with a protuberant portion, while a remaining one of
`the receiver housing and the transmitter housing is provided
`with a depression portion; and the protuberant portion is fit
`with the depression portion when the power transmitter trans(cid:173)
`mits power to the power receiver.
`16. The non-contact power transmission system according
`to claim 15, wherein the coil of the module serves as a receiver
`coil of the power receiver; the power transmitter includes a
`transmitter coil; the receiver coil and the transmitter coil are
`arranged to surround the protuberant portion and the depres(cid:173)
`sion portion.
`
`* * * * *
`
`Petitioner Samsung and Google
`Ex-1005, 0013
`
`