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`US 20080164840A1
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`as) United States
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`a2) Patent Application Publication co) Pub. No.: US 2008/0164840 Al
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`(43) Pub. Date: Jul. 10, 2008
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`Kato et al.
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`(54) NONCONTACT POWER-TRANSMISSION
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`COIL, PORTABLE TERMINAL, AND
`TERMINAL CITARGING DEVICE
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`(30)
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`Foreign Application Priority Data
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`Jan. 9, 2007
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`IP) vee cceeesereeeereee cones 2007-001634
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`(75)
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`Inventors:
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`Hiroshi Kato, Kanagawa (JP);
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`Kuniharu Suzuki, Tokyo (JP);
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`Katsuya Suzuki, Gunma(JP);
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`Manabu Yamazaki, Kanagawa
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`(JP); Yoichira Kondo, Nagano(JP);
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`Kota Onishi, Aichi (JP); Kentaro
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`Yoda, Nagano (JP); Mikimoto Jin,
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`Nagano (JP); Takahiro Kamijo,
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`Nagano (JP); Haruhiko Sogabe,
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`Nagano (JP)
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`Publication Classification
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`(51)
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`Int. Cl.
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`(2006.01)
`102] 7/00
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`(2006.01)
`TOF 5/00
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`(2006.01)
`HOIF 27/28
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`(52) US. Cle ceeccssccstsssssesseeestenseneee 320/108; 336/200
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`ABSTRACT
`(57)
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`A noncontact power-transmission coil is provided. The non-
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`contact power-transmission coil includes a planar coil and a
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`printed-circuit board. The planar coil is formed by spirally
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`winding a linear conductor made ofasingle or twisted wire in
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`a substantially same plane. The printed-circuit board includes
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`a first external connection terminal portion, a second external
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`connection terminal portion,a first contact portion connected
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`to an inner peripheral end ofthe spirally-wound linear con-
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`ductor, a second contact portion connected to the outer
`SonyEricsson Mobile
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`Communications Japan,Inc.,
`peripheral end of the spirally-woundlinear conductor,a first
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`Tokyo (JP); Seiko Epson conductor pattern connectingthefirst contact portion toafirst
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`Corporation, Tokyo (JP)
`external connection terminal portion, and a second conductor
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`pattern connecting the second contact portion to a second
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`external connection terminal portion. One planar portion of
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`the planar coil is attached on the surface of the flexible
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`printed-circuit board.
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`Correspondence Address:
`RADER FISHMAN & GRAUER PLLC
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`LION BUILDING, 1233 20TH STREET N.W.,
`SUITE 501
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`WASHINGTON,DC 20036
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`(73) Assignees:
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`(21) Appl. No.:
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`12/007,078
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`(22)
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`Filed:
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`Jan. 7, 2008
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`23
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`Eeeee
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`10
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`Jul. 10, 2008 Sheet 1 of 12
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`US 2008/0164840 Al
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`FIG. 1
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`oS OQOO0ODGOR0GOC
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`«213202
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`201
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`Jul. 10, 2008 Sheet 2 of 12
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`FIG. 3
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`Jul. 10, 2008 Sheet 4 of 12
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`US 2008/0164840 Al
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`FIG. 6
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`vA ,rfhKNCORNf AtLaeet? CY
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`—*~CXXYXX) (XXXXXONS
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`38
`KKAKKAX
`(VX AKA AD 38
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`UO) (a7
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`30 37
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`FIG. /
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`Jul. 10, 2008 Sheet 5 of 12
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`Jul. 10, 2008 Sheet 6 of 12
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`Fameeh
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`| CATT[|ThtTN
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`Patent Application Publication
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`Jul. 10, 2008 Sheet 7 of 12
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`FIG. 17
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`Jul. 10, 2008 Sheet 9 of 12
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`FIG. 18
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`3139 32
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`Jul. 10, 2008 Sheet 10 of 12
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`FIG. 21
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`LOOOOOOOI
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`TR($RNNNNNy.—§“~S—(<sSU
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`US 2008/0164840 Al
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`Jul. 10, 2008
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`NONCONTACT POWER-TRANSMISSION
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`COIL, PORTABLE TERMINAL, AND
`TERMINAL CHARGING DEVICE
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`CROSS-REFERENCES TO RELATED
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`APPLICATIONS
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`subject matter
`invention contains
`[0001] The present
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`related to Japanese Patent Application JP 2007-001634,filed
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`in the Japanese Patent Office on Jan. 9, 2007, the entire
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`contents of which are incorporated herein by reference.
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`BACKGROUNDOF THE INVENTION
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`[0002]
`1. Field of the Invention
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`[0003] This invention relates to a noncontact power-trans-
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`mission coil for use in power transmission in a noncontact
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`manner using electromagnetic induction, when charging a
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`rechargeable battery incorporated in a small-size, thin por-
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`table terminal such as a mobile phone unit. The invention
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`further relates to a portable terminal and a termina! charging
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`device incorporating such noncontact power-transmission
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`[0004]
`2. Description of the Related Art
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`[0005]
`In the past, systems have been known in which
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`charging powerto charge a rechargeable battery incorporated
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`within a portable terminal, for example, has been transmitted
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`by electromagnetic induction using a noncontact power-
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`[0006]
`In addition, Japanese Unexamined Patent Applica-
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`tion Publication No. 2006-42519 (fIG. 2 and FIG. 3) dis-
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`closes a planar coil as a noncontact power-transmissioncoil
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`mounted on a portable terminal desired to be thin, such as a
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`mobile phoneunit. In this case, the planar coil is constructed
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`suchthat anelectric wire is formed of a single or twisted wire.
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`The surfaceofthe wireis provided with aninsulating layer. In
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`addition, the wire is spirally wound in a substantially same
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`plane. Furthermore, this Patent Documentalso discloses that
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`the formation ofa magnetic sheet. That is, a planer coil on the
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`power-transmitting, side and a planar coil on the power-re-
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`ceiving, side are arranged facing to each other. Then, the
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`counter surface of each coil, which is opposite to the surface
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`facing to the othercoil, is entirely covered with a magnelic
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`sheet to prevent undesired radiation with the magnetic field
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`generated from both coils.
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`SUMMARYOF THE INVENTION
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`FIG. 1 and FIG. 2 illustrate the schematic configu-
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`ration of a noncontact power-transmission coil 200 including
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`a spirally-woundplanar coil according to related art.
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`[0008] As shown in FIG. 1, the spiral planar coil is con-
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`structed of a spirally-wound electric wire 201 made of a
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`single or twisted wire in a substantially sameplane. An elec-
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`tric wire end (for example, the electric wire end on the wind-
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`ing-end side) 205 on an outerperiphery 203 of the planar coil
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`is directly drawnto the outside. On the other hand, an electric
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`wire end (the electric wire end on the winding-start end) 204
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`onaninner periphery 202 is passed over (or under)a spirally-
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`woundelectric wire portion and then drawn to the outside.
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`Furthermore, as shown in FIG. 2, a magnetic sheet 210 is
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`attached on one planarportion of the planar coil of the non-
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`contact power-transmission coil 200 through an adhesion
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`sheet 211. The other planar portion is attached on the internal
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`surface or the like of a terminal housing 213 through an
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`adhesion sheet 211 orthe like ifrequired. Although not shown
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`Page 14 of 23
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`is
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`in the figure, a metal sheet, of aluminum or the like,
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`attached on the outer side of the magnetic sheet 210.
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`[0009] Recently, furthermore, mobile phone units and so on
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`which are thinner than ever may have been demandedin the
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`art. Therefore, a reduction in thickness of the noncontact
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`power-transmission coil constructed of the above spiral
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`planer coil has also been requested in addition to attain a
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`reduction in thickness of any of various electronic parts
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`arranged in the housing of such unit.
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`[0010] However, when the spiral planar coil in the related
`art as illustrated in FIG. 1 and FIG. 2 is mounted on a mobile
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`phoneunitor the like, the electric wire end 204 of the inner
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`periphery 202 of the planarcoil is passed over (or under) the
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`electrical wire portion wound into the spiral shape and then
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`drawn to the outside. Thus, the portions ofan electric wire
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`having a certain thickness may be overlapped one another. In
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`other words, the overlapped portion ofthe electric wire may
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`have a large increase in the thickness of the planar coil,
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`thereby preventing the mobile phone unit from further thin-
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`ning.
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`Itis desirable to provide a noncontact power-trans-
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`mission coil formedofa spiral planar coil capable of further
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`being thin in shape, and a portable terminal and a terminal
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`charging device each incorporating the noncontact power-
`transmission coil.
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`[0012] According to an embodimentof the present inven-
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`tion, there is provided a noncontact power-transmission coil
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`including: a planar coil formed by spirally winding a linear
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`conductor madeof a single or twisted wire in a substantially
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`same plane; and a printed-circuit board. The printed-circuit
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`board hasfirst and second external connection terminal por-
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`tions, first and second contact portions, and first and second
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`conductor patterns. The first contact portion is connected to
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`the inner peripheral end ofthe spirally-woundlinear conduc-
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`tor. The second contact portion is connected to the outer
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`peripheral end of the spirally-wound linear conductor. The
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`first conductor pattern connectsthe first contact portion to a
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`first external connection terminal portion. The second con-
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`ductorpattern connects the second contact portion to a second
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`external connection terminal portion. Furthermore, one pla-
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`nar portion ofthe planarcoil is attached on the surface ofthe
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`flexible printed-circuit board.
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`[0013] Another embodiment of the present invention is a
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`portable terminal including the above-described noncontact
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`power-transmission coil.
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`[0014] A further embodimentof the present invention is a
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`terminal charging device including the above-described non-
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`contact power-transmissioncoil.
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`[0015] According to the embodimentsofthe present inven-
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`tion, a planar coil is formed by spirally winding a linear
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`conductor madeof a single or twisted wire in a substantially
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`sameplane. In addition, the inner peripheral end ofthe planar
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`coil is connected with an external connection terminal by a
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`conductor pattern on a printed-circuit board. ‘hercfore, the
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`linear conductorofthe planar coil maynot cause overlapping
`ofthe linear conductor in contrast to the case in which the
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`linear conductor ofthe planar coil is drawn from the inner
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`peripheryto the outer periphery.
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`[0016] According to the embodimentsofthe present inven-
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`tion, therefore, a linear conductor madeofa single or twisted
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`wire can be prevented from overlapping and further a non-
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`contact power-transmission coil can be made thin. Conse-
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`Page 14 of 23
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`

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`US 2008/0164840 Al
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`Jul. 10, 2008
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`quently, any of portable terminals and terminal charging
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`devices can be made thin by mounting the noncontact power-
`transmission coil thereon.
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`BRIEF DESCRIPTION OF THE DRAWINGS
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`[0017]
`FIG. 1 is a schematic front view of a planer coil
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`accordingto a related art, in which an electric wire end ofthe
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`inner periphery of a spirally-woundelectric wire is drawn to
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`the outside by passing the electric wire over or undera spi-
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`rally-woundelectric wire portion.
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`FIG. 2 is a schematic cross-sectional view of the
`[0018]
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`planner coil shownin FIG. 1.
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`[0019] FIG.3 is adiagram showing a schematic innerstruc-
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`ture of a principal part of a mobile phone unit and a cradle
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`according to an embodimentofthe present invention.
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`FIG. 4 is a schematic front view of a noncontact
`[0020]
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`power-transmission coil in which a planar coil formed of a
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`spirally-woundelectric wire is stuck on a flexible printed-
`circuit board.
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`[0021] TIG. 5 is a schematic front view ofthe noncontact
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`power-transmission coil in which the planar coil shown in
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`FIG.4 is not stuck on the flexible printed-circuit board.
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`[0022]
`FIG. 6 is a schematic cross-sectional view of the
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`noncontact power-transmission coil shownin FIG. 4.
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`FIG. 7 is a schematic front view of a noncontact
`[0023]
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`power-transmission coil having a multi-layered flexible
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`printed-circuit board in which a planarcoil pattern formed of
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`a spirally-formed conductor pattern is formed on top of the
`other.
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`[0024]
`FIG. 8 is aschematic perspective view of the multi-
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`layered flexible printed-circuit board shawnin FIG. 7, where
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`the respective layers are separated from each other.
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`[0025]
`FIG. 9is a schematic cross-sectional view ofa non-
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`contact power-transmission coil having the multi-layered
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`flexible printed-circuit board shown in FIG.7.
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`FIG. 10 is a partly-enlarged view of the noncontact
`[0026]
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`power-transmission coil having the multi-layered flexible
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`printed-circuit board shown in FIG.9.
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`FIG. 11 is a schematic cross sectional view of a
`[0027]
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`near-coil portion when the noncontact power-transmission
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`coil of the mobile phone unit and the noncontact power-
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`transmission coil of the cradle are arranged in proximity to
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`each other, where a magnetic sheetis stuck on each ofthem so
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`that the flat surface of a planar coil formed of a spirally-
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`wound electric wire is entirely covered with the magnetic
`sheet.
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`FIG. 12 is an enlarged viewof a part of FIG. 11,
`[0028]
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`where the flow of a magnetic flux formed by both coils is
`illustrated.
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`[0029] TIG. 13 is a schematic cross sectional view of a
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`near-coil portion when the noncontact power-transmission
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`coil of the mobile phone unit and the noncontact power-
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`transmission coil of the cradle are arranged in proximity to
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`each other, where a magnetic sheet is stuck on each ofthem so
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`that the magnetic sheet is only placed onthe flat surface of a
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`planar coil formed ofa spirally-woundelectric wire.
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`[0030]
`FIG. 14 is an enlarged viewof a part of FIG. 12,
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`wherethe flow of a magnetic flux formedby both the coils is
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`illustrated;
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`FIG. 15 is a schematic cross sectional view of a
`[0031]
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`near-coil portion when the noncontact power-transmission
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`coil of the mobile phone unit and the noncontact power-
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`transmission coil of the cradle are arranged in proximity to
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`each other, where a magnetic sheet is stuck on each ofthem so
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`Page 15 of 23
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`that both the flat surface and the side portionofa planarcoil
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`formedof a spirally-woundelectric wire is entirely covered
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`with the magnetic sheet.
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`[0032]
`FIG. 16 is an enlarged view of a part of FIG. 15,
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`wherethe flow of a magnetic flux formed by both the coils is
`illustrated.
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`FIG. 17 is a schematic front view of a noncontact
`[0033]
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`power-transmission coil having a flexible printed-circuit
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`board with the shape substantially fit to a planar coil formed
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`of a spirally-woundelectric wire.
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`[0034]
`FIG. 18 is a schematic front view of the noncontact
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`power-transmission coil in which the planar coil shown in
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`FIG. 17 is not stuck on the flexible printed-circuit board.
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`[0035]
`FIG. 19 is a schematic cross-sectional view of the
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`noncontact power-transmission coil, where a magnetic layer
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`is formed on boththe flat surface and an outer peripheryside
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`portion ofthe planer coil shown in FIG. 17.
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`FIG.20 is a partly-enlarged view of the noncontact
`[0036]
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`power-transmission coil shown in FIG. 17.
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`FIG. 21 is a schematic front view of a noncontact
`[0037]
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`power-transmission coil having a multi-layered flexible
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`printed-circuit board with the shape substantially fit to a pla-
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`nar coil pattern madeof a spirally-formed conductorpattern.
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`[0038]
`FIG. 22 is a schematic cross-sectional view ofthe
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`noncontact power-transmission coil, where a magnetic layer
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`is formed on boththeflat surface and an outer peripheryside
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`portion ofthe planercoil ofthe multi-layered flexible printed-
`circuit board shownin FIG.21.
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`[0039]
`[IG. 23 is a partly-enlarged view of the noncontact
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`power-transmission coil shownin I'IG. 22.
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`FIG. 24 is a schematic cross sectional view of a
`[0040]
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`noncontact power-transmission coil, where a magnetic layer
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`is formed up to the part of a hole opened in the planar coil
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`inner periphery portion of a multi-layered flexible printed-
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`circuit board with the shape substantially fit to a planar coil
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`pattern madeofa spirally-formed conductor patter.
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`FIG.25 is a partly-enlarged view of the noncontact
`[0041]
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`power-transmissioncoil shown in FIG. 24.
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`FIG. 26 is a schematic cross-sectional view of a
`[0042]
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`noncontact power-transmission coil as an example, where a
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`temperature-detecting element layer is formed in a flexible
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`printed-circuil board ofa noncontact power-transmission coil
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`on which a magnetic layer is formed on both theflat surface
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`and the outer periphery side portion ofa planar coil formed of
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`a spirally-woundelectric wire.
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`[0043]
`FIG. 27 is a schematic front view of the flexible
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`printed-circuit board having the temperature-detecting ele-
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`ment layer shown in FIG. 26 in which the planar coil is not
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`stuck on the flexible printed-circuit board.
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`[0044]
`FIG. 28 is a schematic cross-sectional view of a
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`noncontact power-transmission coil as an example, where a
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`temperature-detecting element layer is formed in a flexible
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`printed-circuit board of a noncontact power-transmission coil
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`on which a magnetic layer is formed on both theflat surface
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`andthe outer periphery side portion ofa planar coil formed of
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`a spirally-wound conductorpattern.
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`DESCRIPTION OF THE PREFERRED
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`EMBODIMENTS
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`[0045] Hereinafter, one embodimentof the present inven-
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`tion will be described with referenceto the attached drawings.
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`[0046]
`Inthis embodiment, a mobile phone unit is provided
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`as an example of a portable terminal. In this case, a noncon-
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`tact power-transmission coil with a spiral planar coil in accor-
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`Page 15 of 23
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`US 2008/0164840 Al
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`Jul. 10, 2008
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`invention is
`dance with the embodiment of the present
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`mounted on the portable terminal. In addition, as an example
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`of a terminal charging device in accordance with an embodi-
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`mentofthe present invention, a cradle capable of charging at
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`least the above mobile phone unit is provided. Needless to
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`say, any content described herein is only provided as an
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`example and the present invention is thus not limited to such
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`an example.
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`[0047]
`[General Configurations of Cradle and Mobile
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`Phone Unit and their Basic Actions in Charging]
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`[0048]
`FIG. 3 is a diagram that schematically illustrates
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`both the inner structure ofprincipalparts ofa cradle 1 and the
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`innerstructure ofprincipal parts of a mobile phoneunit 2.
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`[0049] The mobile phone unit 2 ofthe present embodiment
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`includes a battery 22, a secondary power-transmission coil
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`21, a circuit board 23, and a housing in which these structural
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`components are housed. Specifically, the battery 22 includes
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`at least a rechargeable battery that generates power for oper-
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`ating the terminal. The secondary power-transmission coil 21
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`is provided as a noncontact power-transmission coil on the
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`power-receiving side for charging the battery. Furthermore,
`various electronic circuits are mounted on the circuit board
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`23. The electronic circuits include a charging control circuit
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`that chargesthe battery 22 by supplying the received power to
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`the battery 22 through the secondary power-transmission coil
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`21. In the present embodiment,
`the illustration and the
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`description ofother structural components such as those com-
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`monlyinstalled in any typical mobile phoneunit are omitted.
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`‘lhe battery 22 is detachably mounted on the mobile
`[0050]
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`phone unit 2. The mobile phone unit 2 is provided with a
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`battery cover 20 to be closed and opened (or detached or
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`attached) whenthe battery 22 is detached from or attached to
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`the mobile phone unit 2.
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`[0051] The secondary power-transmission coil 21 is
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`formed of a planar coil in which a linear conductor having
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`electrical conductivityis spirally formed. One planar section
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`of the secondary power-transmission coil 21 is affixed to the
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`inner wall of the battery cover or on the outer surface of the
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`battery 22 on the battery cover (20)’s side. The present
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`embodiment will be described with respect to the case in
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`whichthe secondary power-transmission coil 21 is affixed to
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`the inner wall of the battery cover 20. The details of the
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`configuration of the secondary power-transmission coil 21
`will be described later.
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`the cradle 1 of the present
`[0052] On the other hand,
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`embodimentincludes a primary power-transmission coil 10,
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`a control board 11, a power-supply cord 12, and a housing in
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`which these structural components are housed. The primary
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`power-transmission coil 10 is provided as a noncontact
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`power-transmission coil on the power-transmission side for
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`charging the battery 22 of the mobile phone unit 2. The
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`control board 11 supplies power to the primary power-trans-
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`mission coil 10 and controls the operation. In addition, the
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`power-supply cord 12 is, for example, connected to a con-
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`sumer power supply system.Illustration and description of
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`otherstructural components provided withtypical cradles are
`omitted herein.
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`[0053]
`Substantially similar to the case of the secondary
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`power-transmission coil 21 of the mobile phone unit 2, the
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`primary power-transmission coil 10 ofthe cradle 1 is a planar
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`coil in which a linear conductorwith electrical conductivityis
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`spirally formed. One flat surface of the power-transmission
`coil 10 is stuck on the inner wall side of the terminal-mount-
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`ing baseof the cradle 1.
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`[0054] The mobile phone unit 2 is placed on the terminal
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`mounting base of the cradle 1. Then, the secondary power-
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`transmission coil 21 of the mobile phone unit 2 and the
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`primary power-transmission coil 10 ofthe cradle 1 are posi-
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`tioned in proximity. Accordingly, the state of the magnetic
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`field within the primary power-transmission coil 10 changes.
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`The control board portion 11 monitors changesin thestate of
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`the magnetic field in the primary power-transmission coil 10
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`when the secondary transmission coil 21 is positioned in
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`proximity, by intermittent driving or similar.
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`[0055] The charging control circuit of the mobile phone
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`unit 2 according to the embodiment is allowed to detect a
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`voltage change in response to a change in magnetic field of
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`the secondary power-transmission coil 21. The change in
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`magnetic field occurs when the mobile phoneunit 2 is placed
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`on the terminal-mounting base of the cradle 1 and the sec-
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`ondary power-transmission coil 21 ofthe mobile phoneunit 2
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`is then closely arranged to the primary power-transmission
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`coil 10 of the cradle 1. Furthermore, a change in magnetic
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`field of the secondary power-transmission coil 21 is caused
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`when the primary power-transmission coil 10 is closcly
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`arranged. When a voltage level duc to such a change has
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`reached a predetermined level, the charging control circuit of
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`the mobile phoneunit 2 then determines that the phone unit 2
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`is placed on the terminal-mounting base ofthe cradle 1.
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`[0056]
`Furthermore, in the present embodiment, both the
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`cradle 1 and the mobile phone unit 2 are designed to be
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`capable of transmitting information through the primary
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`power-transmission coil 10 and the secondary power-trans-
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`mission coil 21, respectively. For example, when the mobile
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`phoneunit 2 is placed on the terminal-mounting base of the
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`cradle 1, they mutually detect a close arrangement of the
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`primary coil 10 and the secondary power-transmission coil 21
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`on the basis of a change in magneticfield as described above.
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`At this time, the cradle 1 and the mobile phone unit 2
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`exchange their identification information for authenticating
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`the counterpart by transmitting the information through the
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`primary power-transmission coil 10 and the secondary
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`power-transmission coil 21, respectively.
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`[0057]
`Furthermore, according to the embodiment of the
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`present invention, both the cradle 1 and the mobile phoneunit
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`2 detect the close arrangement of the primary power-trans-
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`mission coil 10 and the secondary power-transmission coil
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`21. Furthermore, whenthe cradle 1 and the mobile phoneunit
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`2 authenticate each other, the cradle 1 is then allowed to
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`transmit powerto the mobile phoneunit 2. Subsequently, the
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`battery 22 of the mobile phone unit 2 is charged with the
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`transmitted power.
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`[0058]
`In this way, when the charging ofthe battery 22 of
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`the mobile phone unit 2 is started as described above, the
`control board 11 ofthe cradle 1 converts a consumeralternat-
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`ing voltage supplied through the power-supply cord 12 into a
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`predetermined direct current voltage. An alternating voltage
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`at a predetermined frequency is generated using the direct
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`current voltage and the generated alternating voltage is then
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`suppli