(19) United States
`(12) Patent Application Publication (10) Pub. No.: US 2008/016484.0 A1
`(43) Pub. Date:
`Jul. 10, 2008
`Kato et al.
`
`US 2008O164840A1
`
`(54) NONCONTACT POWER-TRANSMISSION
`COIL, PORTABLE TERMINAL AND
`TERMINAL CHARGING DEVICE
`
`(30)
`
`Foreign Application Priority Data
`
`Jan. 9, 2007 (JP) ................................. 2007-OO1634
`
`(75) Inventors:
`
`Hiroshi Kato, Kanagawa (JP);
`Kuniharu Suzuki, Tokyo (JP);
`Katsuya Suzuki, Gunma (JP);
`Manabu Yamazaki, Kanagawa
`(JP); Yoichiro Kondo, Nagano (JP);
`Kota Onishi, Aichi (JP); Kentaro
`Yoda, Nagano (JP); Mikimoto Jin,
`Nagano (JP); Takahiro Kamijo,
`Nagano (JP); Haruhiko Sogabe,
`Nagano (JP)
`
`Correspondence Address:
`RADERFISHMAN & GRAUER PLLC
`LION BUILDING, 1233 20TH STREET N.W.,
`SUTESO1
`WASHINGTON, DC 20036
`
`(73) Assignees:
`
`Sony Ericsson Mobile
`Communications Japan, Inc.,
`Tokyo (JP); Seiko Epson
`Corporation, Tokyo (JP)
`
`(21) Appl. No.:
`
`12/007,078
`
`(22) Filed:
`
`Jan. 7, 2008
`
`Publication Classification
`
`(51) Int. Cl.
`(2006.01)
`H02. 7/00
`(2006.01)
`HOIF 5/00
`(2006.01)
`HOIF 27/28
`(52) U.S. Cl. ......................................... 320/108; 336/200
`(57)
`ABSTRACT
`A noncontact power-transmission coil is provided. The non
`contact power-transmission coil includes a planar coil and a
`printed-circuit board. The planar coil is formed by spirally
`winding a linear conductor made of a single or twisted wire in
`a Substantially same plane. The printed-circuit board includes
`a first external connection terminal portion, a second external
`connection terminal portion, a first contact portion connected
`to an inner peripheral end of the spirally-wound linear con
`ductor, a second contact portion connected to the outer
`peripheral end of the spirally-wound linear conductor, a first
`conductor pattern connecting the first contact portion to a first
`external connection terminal portion, and a second conductor
`pattern connecting the second contact portion to a second
`external connection terminal portion. One planar portion of
`the planar coil is attached on the surface of the flexible
`printed-circuit board.
`
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`Patent Application Publication
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`Jul. 10, 2008 Sheet 1 of 12
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`US 2008/O16484.0 A1
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`Patent Application Publication
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`Jul. 10, 2008 Sheet 2 of 12
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`US 2008/O16484.0 A1
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`Patent Application Publication
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`Jul. 10, 2008 Sheet 4 of 12
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`Patent Application Publication
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`Jul. 10, 2008 Sheet 6 of 12
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`US 2008/O16484.0 A1
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`Patent Application Publication
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`Jul. 10, 2008 Sheet 9 of 12
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`Patent Application Publication
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`Jul. 10, 2008 Sheet 10 of 12
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`Patent Application Publication
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`Jul. 10, 2008 Sheet 11 of 12
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`US 2008/O16484.0 A1
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`Patent Application Publication
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`Jul. 10, 2008 Sheet 12 of 12
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`US 2008/016484.0 A1
`
`Jul. 10, 2008
`
`NONCONTACT POWER-TRANSMISSION
`COIL, PORTABLE TERMINAL AND
`TERMINAL CHARGING DEVICE
`
`CROSS-REFERENCES TO RELATED
`APPLICATIONS
`0001. The present invention contains subject matter
`related to Japanese Patent Application.JP 2007-001634, filed
`in the Japanese Patent Office on Jan. 9, 2007, the entire
`contents of which are incorporated herein by reference.
`
`BACKGROUND OF THE INVENTION
`0002 1. Field of the Invention
`0003. This invention relates to a noncontact power-trans
`mission coil for use in power transmission in a noncontact
`manner using electromagnetic induction, when charging a
`rechargeable battery incorporated in a small-size, thin por
`table terminal such as a mobile phone unit. The invention
`further relates to a portable terminal and a terminal charging
`device incorporating Such noncontact power-transmission
`coil.
`0004 2. Description of the Related Art
`0005. In the past, systems have been known in which
`charging power to charge a rechargeable battery incorporated
`within a portable terminal, for example, has been transmitted
`by electromagnetic induction using a noncontact power
`transmission coil.
`0006. In addition, Japanese Unexamined Patent Applica
`tion Publication No. 2006-42519 (FIG. 2 and FIG. 3) dis
`closes a planar coil as a noncontact power-transmission coil
`mounted on a portable terminal desired to be thin, such as a
`mobile phone unit. In this case, the planar coil is constructed
`such that an electric wire is formed of a single or twisted wire.
`The surface of the wire is provided with an insulating layer. In
`addition, the wire is spirally wound in a Substantially same
`plane. Furthermore, this Patent Document also discloses that
`the formation of a magnetic sheet. That is, a planer coil on the
`power-transmitting side and a planar coil on the power-re
`ceiving side are arranged facing to each other. Then, the
`counter Surface of each coil, which is opposite to the Surface
`facing to the other coil, is entirely covered with a magnetic
`sheet to prevent undesired radiation with the magnetic field
`generated from both coils.
`
`SUMMARY OF THE INVENTION
`0007 FIG. 1 and FIG. 2 illustrate the schematic configu
`ration of a noncontact power-transmission coil 200 including
`a spirally-wound planar coil according to related art.
`0008. As shown in FIG. 1, the spiral planar coil is con
`structed of a spirally-wound electric wire 201 made of a
`single or twisted wire in a Substantially same plane. An elec
`tric wire end (for example, the electric wire end on the wind
`ing-end side) 205 on an outer periphery 203 of the planar coil
`is directly drawn to the outside. On the other hand, an electric
`wire end (the electric wire end on the winding-start end) 204
`on an inner periphery 202 is passed over (or under) a spirally
`wound electric wire portion and then drawn to the outside.
`Furthermore, as shown in FIG. 2, a magnetic sheet 210 is
`attached on one planar portion of the planar coil of the non
`contact power-transmission coil 200 through an adhesion
`sheet 211. The other planar portion is attached on the internal
`surface or the like of a terminal housing 213 through an
`adhesion sheet 211 or the like if required. Although not shown
`
`in the figure, a metal sheet, of aluminum or the like, is
`attached on the outer side of the magnetic sheet 210.
`0009 Recently, furthermore, mobile phone units and so on
`which are thinner than ever may have been demanded in the
`art. Therefore, a reduction in thickness of the noncontact
`power-transmission coil constructed of the above spiral
`planer coil has also been requested in addition to attain a
`reduction in thickness of any of various electronic parts
`arranged in the housing of Such unit.
`0010. However, when the spiral planar coil in the related
`art as illustrated in FIG. 1 and FIG. 2 is mounted on a mobile
`phone unit or the like, the electric wire end 204 of the inner
`periphery 202 of the planar coil is passed over (or under) the
`electrical wire portion wound into the spiral shape and then
`drawn to the outside. Thus, the portions of an electric wire
`having a certain thickness may be overlapped one another. In
`other words, the overlapped portion of the electric wire may
`have a large increase in the thickness of the planar coil,
`thereby preventing the mobile phone unit from further thin
`ning.
`0011. It is desirable to provide a noncontact power-trans
`mission coil formed of a spiral planar coil capable of further
`being thin in shape, and a portable terminal and a terminal
`charging device each incorporating the noncontact power
`transmission coil.
`0012. According to an embodiment of the present inven
`tion, there is provided a noncontact power-transmission coil
`including: a planar coil formed by spirally winding a linear
`conductor made of a single or twisted wire in a Substantially
`same plane; and a printed-circuit board. The printed-circuit
`board has first and second external connection terminal por
`tions, first and second contact portions, and first and second
`conductor patterns. The first contact portion is connected to
`the inner peripheral end of the spirally-wound linear conduc
`tor. The second contact portion is connected to the outer
`peripheral end of the spirally-wound linear conductor. The
`first conductor pattern connects the first contact portion to a
`first external connection terminal portion. The second con
`ductor pattern connects the second contact portion to a second
`external connection terminal portion. Furthermore, one pla
`nar portion of the planar coil is attached on the surface of the
`flexible printed-circuit board.
`0013 Another embodiment of the present invention is a
`portable terminal including the above-described noncontact
`power-transmission coil.
`0014. A further embodiment of the present invention is a
`terminal charging device including the above-described non
`contact power-transmission coil.
`0015. According to the embodiments of the present inven
`tion, a planar coil is formed by spirally winding a linear
`conductor made of a single or twisted wire in a Substantially
`same plane. In addition, the inner peripheral end of the planar
`coil is connected with an external connection terminal by a
`conductor pattern on a printed-circuit board. Therefore, the
`linear conductor of the planarcoil may not cause overlapping
`of the linear conductor in contrast to the case in which the
`linear conductor of the planar coil is drawn from the inner
`periphery to the outer periphery.
`0016. According to the embodiments of the present inven
`tion, therefore, a linear conductor made of a single or twisted
`wire can be prevented from overlapping and further a non
`contact power-transmission coil can be made thin. Conse
`
`Ex.1017 / IPR2022-00118 / Page 14 of 23
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`US 2008/016484.0 A1
`
`Jul. 10, 2008
`
`quently, any of portable terminals and terminal charging
`devices can be made thin by mounting the noncontact power
`transmission coil thereon.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`0017 FIG. 1 is a schematic front view of a planer coil
`according to a related art, in which an electric wire end of the
`inner periphery of a spirally-wound electric wire is drawn to
`the outside by passing the electric wire over or under a spi
`rally-wound electric wire portion.
`0.018
`FIG. 2 is a schematic cross-sectional view of the
`planner coil shown in FIG. 1.
`0019 FIG.3 is a diagram showing a schematic inner struc
`ture of a principal part of a mobile phone unit and a cradle
`according to an embodiment of the present invention.
`0020 FIG. 4 is a schematic front view of a noncontact
`power-transmission coil in which a planar coil formed of a
`spirally-wound electric wire is stuck on a flexible printed
`circuit board.
`0021
`FIG. 5 is a schematic front view of the noncontact
`power-transmission coil in which the planar coil shown in
`FIG. 4 is not stuck on the flexible printed-circuit board.
`0022 FIG. 6 is a schematic cross-sectional view of the
`noncontact power-transmission coil shown in FIG. 4.
`0023 FIG. 7 is a schematic front view of a noncontact
`power-transmission coil having a multi-layered flexible
`printed-circuitboard in which a planar coil pattern formed of
`a spirally-formed conductor pattern is formed on top of the
`other.
`0024 FIG. 8 is a schematic perspective view of the multi
`layered flexible printed-circuitboard shown in FIG. 7, where
`the respective layers are separated from each other.
`0.025 FIG.9 is a schematic cross-sectional view of a non
`contact power-transmission coil having the multi-layered
`flexible printed-circuit board shown in FIG. 7.
`0026 FIG. 10 is a partly-enlarged view of the noncontact
`power-transmission coil having the multi-layered flexible
`printed-circuit board shown in FIG. 9.
`0027 FIG. 11 is a schematic cross sectional view of a
`near-coil portion when the noncontact power-transmission
`coil of the mobile phone unit and the noncontact power
`transmission coil of the cradle are arranged in proximity to
`each other, where a magnetic sheet is stuck on each of them so
`that the flat surface of a planar coil formed of a spirally
`wound electric wire is entirely covered with the magnetic
`sheet.
`0028 FIG. 12 is an enlarged view of a part of FIG. 11,
`where the flow of a magnetic flux formed by both coils is
`illustrated.
`0029 FIG. 13 is a schematic cross sectional view of a
`near-coil portion when the noncontact power-transmission
`coil of the mobile phone unit and the noncontact power
`transmission coil of the cradle are arranged in proximity to
`each other, where a magnetic sheet is stuck on each of them so
`that the magnetic sheet is only placed on the flat surface of a
`planar coil formed of a spirally-wound electric wire.
`0030 FIG. 14 is an enlarged view of a part of FIG. 12,
`where the flow of a magnetic flux formed by both the coils is
`illustrated;
`0031
`FIG. 15 is a schematic cross sectional view of a
`near-coil portion when the noncontact power-transmission
`coil of the mobile phone unit and the noncontact power
`transmission coil of the cradle are arranged in proximity to
`each other, where a magnetic sheet is stuck on each of them so
`
`that both the flat surface and the side portion of a planar coil
`formed of a spirally-wound electric wire is entirely covered
`with the magnetic sheet.
`0032 FIG. 16 is an enlarged view of a part of FIG. 15,
`where the flow of a magnetic flux formed by both the coils is
`illustrated.
`0033 FIG. 17 is a schematic front view of a noncontact
`power-transmission coil having a flexible printed-circuit
`board with the shape substantially fit to a planar coil formed
`of a spirally-wound electric wire.
`0034 FIG. 18 is a schematic front view of the noncontact
`power-transmission coil in which the planar coil shown in
`FIG. 17 is not stuck on the flexible printed-circuit board.
`0035 FIG. 19 is a schematic cross-sectional view of the
`noncontact power-transmission coil, where a magnetic layer
`is formed on both the flat surface and an outer periphery side
`portion of the planer coil shown in FIG. 17.
`0036 FIG. 20 is a partly-enlarged view of the noncontact
`power-transmission coil shown in FIG. 17.
`0037 FIG. 21 is a schematic front view of a noncontact
`power-transmission coil having a multi-layered flexible
`printed-circuit board with the shape substantially fit to a pla
`nar coil pattern made of a spirally-formed conductor pattern.
`0038 FIG. 22 is a schematic cross-sectional view of the
`noncontact power-transmission coil, where a magnetic layer
`is formed on both the flat surface and an outer periphery side
`portion of the planer coil of the multi-layered flexible printed
`circuit board shown in FIG. 21.
`0039 FIG. 23 is a partly-enlarged view of the noncontact
`power-transmission coil shown in FIG. 22.
`0040 FIG. 24 is a schematic cross sectional view of a
`noncontact power-transmission coil, where a magnetic layer
`is formed up to the part of a hole opened in the planar coil
`inner periphery portion of a multi-layered flexible printed
`circuit board with the shape substantially fit to a planar coil
`pattern made of a spirally-formed conductor patter.
`0041
`FIG. 25 is a partly-enlarged view of the noncontact
`power-transmission coil shown in FIG. 24.
`0042 FIG. 26 is a schematic cross-sectional view of a
`noncontact power-transmission coil as an example, where a
`temperature-detecting element layer is formed in a flexible
`printed-circuitboard of a noncontact power-transmission coil
`on which a magnetic layer is formed on both the flat surface
`and the outer periphery side portion of a planarcoil formed of
`a spirally-wound electric wire.
`0043 FIG. 27 is a schematic front view of the flexible
`printed-circuit board having the temperature-detecting ele
`ment layer shown in FIG. 26 in which the planar coil is not
`stuck on the flexible printed-circuit board.
`0044 FIG. 28 is a schematic cross-sectional view of a
`noncontact power-transmission coil as an example, where a
`temperature-detecting element layer is formed in a flexible
`printed-circuitboard of a noncontact power-transmission coil
`on which a magnetic layer is formed on both the flat surface
`and the outer periphery side portion of a planarcoil formed of
`a spirally-wound conductor pattern.
`
`DESCRIPTION OF THE PREFERRED
`EMBODIMENTS
`0045. Hereinafter, one embodiment of the present inven
`tion will be described with reference to the attached drawings.
`0046. In this embodiment, a mobile phone unit is provided
`as an example of a portable terminal. In this case, a noncon
`tact power-transmission coil with a spiral planarcoil in accor
`
`Ex.1017 / IPR2022-00118 / Page 15 of 23
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`US 2008/016484.0 A1
`
`Jul. 10, 2008
`
`dance with the embodiment of the present invention is
`mounted on the portable terminal. In addition, as an example
`of a terminal charging device in accordance with an embodi
`ment of the present invention, a cradle capable of charging at
`least the above mobile phone unit is provided. Needless to
`say, any content described herein is only provided as an
`example and the present invention is thus not limited to Such
`an example.
`0047
`General Configurations of Cradle and Mobile
`Phone Unit and their Basic Actions in Charging
`0048 FIG. 3 is a diagram that schematically illustrates
`both the inner structure of principal parts of a cradle 1 and the
`inner structure of principal parts of a mobile phone unit 2.
`0049. The mobile phone unit 2 of the present embodiment
`includes a battery 22, a secondary power-transmission coil
`21, a circuit board 23, and a housing in which these structural
`components are housed. Specifically, the battery 22 includes
`at least a rechargeable battery that generates power for oper
`ating the terminal. The secondary power-transmission coil 21
`is provided as a noncontact power-transmission coil on the
`power-receiving side for charging the battery. Furthermore,
`various electronic circuits are mounted on the circuit board
`23. The electronic circuits include a charging control circuit
`that charges the battery 22 by Supplying the received power to
`the battery 22 through the secondary power-transmission coil
`21. In the present embodiment, the illustration and the
`description of other structural components such as those com
`monly installed in any typical mobile phone unit are omitted.
`0050. The battery 22 is detachably mounted on the mobile
`phone unit 2. The mobile phone unit 2 is provided with a
`battery cover 20 to be closed and opened (or detached or
`attached) when the battery 22 is detached from or attached to
`the mobile phone unit 2.
`0051. The secondary power-transmission coil 21 is
`formed of a planar coil in which a linear conductor having
`electrical conductivity is spirally formed. One planar section
`of the secondary power-transmission coil 21 is affixed to the
`inner wall of the battery cover or on the outer surface of the
`battery 22 on the battery cover (20)'s side. The present
`embodiment will be described with respect to the case in
`which the secondary power-transmission coil 21 is affixed to
`the inner wall of the battery cover 20. The details of the
`configuration of the secondary power-transmission coil 21
`will be described later.
`0052. On the other hand, the cradle 1 of the present
`embodiment includes a primary power-transmission coil 10,
`a control board 11, a power-supply cord 12, and a housing in
`which these structural components are housed. The primary
`power-transmission coil 10 is provided as a noncontact
`power-transmission coil on the power-transmission side for
`charging the battery 22 of the mobile phone unit 2. The
`control board 11 Supplies power to the primary power-trans
`mission coil 10 and controls the operation. In addition, the
`power-supply cord 12 is, for example, connected to a con
`Sumer power Supply system. Illustration and description of
`other structural components provided with typical cradles are
`omitted herein.
`0053 Substantially similar to the case of the secondary
`power-transmission coil 21 of the mobile phone unit 2, the
`primary power-transmission coil 10 of the cradle 1 is a planar
`coil in which a linear conductor with electrical conductivity is
`spirally formed. One flat surface of the power-transmission
`coil 10 is stuck on the inner wall side of the terminal-mount
`ing base of the cradle 1.
`
`0054 The mobile phone unit 2 is placed on the terminal
`mounting base of the cradle 1. Then, the secondary power
`transmission coil 21 of the mobile phone unit 2 and the
`primary power-transmission coil 10 of the cradle 1 are posi
`tioned in proximity. Accordingly, the state of the magnetic
`field within the primary power-transmission coil 10 changes.
`The control board portion 11 monitors changes in the state of
`the magnetic field in the primary power-transmission coil 10
`when the secondary transmission coil 21 is positioned in
`proximity, by intermittent driving or similar.
`0055. The charging control circuit of the mobile phone
`unit 2 according to the embodiment is allowed to detect a
`Voltage change in response to a change in magnetic field of
`the secondary power-transmission coil 21. The change in
`magnetic field occurs when the mobile phone unit 2 is placed
`on the terminal-mounting base of the cradle 1 and the sec
`ondary power-transmission coil 21 of the mobile phone unit 2
`is then closely arranged to the primary power-transmission
`coil 10 of the cradle 1. Furthermore, a change in magnetic
`field of the secondary power-transmission coil 21 is caused
`when the primary power-transmission coil 10 is closely
`arranged. When a Voltage level due to Such a change has
`reached a predetermined level, the charging control circuit of
`the mobile phone unit 2 then determines that the phone unit 2
`is placed on the terminal-mounting base of the cradle 1.
`0056 Furthermore, in the present embodiment, both the
`cradle 1 and the mobile phone unit 2 are designed to be
`capable of transmitting information through the primary
`power-transmission coil 10 and the secondary power-trans
`mission coil 21, respectively. For example, when the mobile
`phone unit 2 is placed on the terminal-mounting base of the
`cradle 1, they mutually detect a close arrangement of the
`primary coil 10 and the secondary power-transmission coil 21
`on the basis of a change in magnetic field as described above.
`At this time, the cradle 1 and the mobile phone unit 2
`exchange their identification information for authenticating
`the counterpart by transmitting the information through the
`primary power-transmission coil 10 and the secondary
`power-transmission coil 21, respectively.
`0057. Furthermore, according to the embodiment of the
`present invention, both the cradle 1 and the mobile phone unit
`2 detect the close arrangement of the primary power-trans
`mission coil 10 and the secondary power-transmission coil
`21. Furthermore, when the cradle 1 and the mobile phone unit
`2 authenticate each other, the cradle 1 is then allowed to
`transmit power to the mobile phone unit 2. Subsequently, the
`battery 22 of the mobile phone unit 2 is charged with the
`transmitted power.
`0058. In this way, when the charging of the battery 22 of
`the mobile phone unit 2 is started as described above, the
`control board 11 of the cradle 1 converts a consumer alternat
`ing Voltage Supplied through the power-supply cord 12 into a
`predetermined direct current Voltage. An alternating Voltage
`at a predetermined frequency is generated using the direct
`current Voltage and the generated alternating Voltage is then
`supplied to the primary power-transmission coil 10. On the
`other hand, when an alternating Voltage is induced in the
`secondary power-transmission coil 21 with the alternating
`voltage from the primary power-transmission coil 10 of the
`cradle 1, the mobile phone unit 2 rectifies the induced alter
`nating Voltage and then converts it into a direct current Volt
`age, followed by charging the battery 22 with the direct cur
`rent Voltage.
`
`Ex.1017 / IPR2022-00118 / Page 16 of 23
`APPLE INC. v. SCRAMOGE TECHNOLOGY, LTD.
`
`

`

`US 2008/016484.0 A1
`
`Jul. 10, 2008
`
`0059. Furthermore, in the present embodiment, the con
`trol board 11 of the cradle 1 makes a determination under the
`following conditions. One side cannot authenticate the other
`side on the basis of the identification information thereof.
`Such a state may occur when a Voltage level based on a
`change in electric field of the primary power-transmission
`coil 10 has not reach a predetermined voltage level. Such a
`state may also occur even when a Voltage level based on a
`change in electric field of the primary power-transmission
`coil 10 has reached a predetermined voltage level. Conse
`quently, the control board 11 of the cradle 1 determines that a
`change in magnetic field of the primary power-transmission
`coil 10 is generated when a metal Substance. Such as a coin, or
`any of other substances with electrical conductivities is
`placed on the terminal-mounting base. Then, the control
`board 11 takes control of terminating the supply of power to
`the primary power-transmission coil 10.
`0060. Furthermore, in the present embodiment, when the
`battery 22 of the mobile phone unit 2 is being charged by
`transferring power from the cradle 1, the transmission of
`charging information is carried out between the cradle 1 and
`the mobile phone unit 2 through the primary power-transmis
`sion coil 10 and the secondary power-transmission coil 21. In
`other words, the charging control circuit of mobile phone unit
`2 transmits the charging information of the battery 22 of the
`mobile phone unit 2 to the cradle 1 when the battery 22 is
`being charged by the power transmission from the cradle 1.
`The control board 11 of the cradle 1 monitors the charging
`status of the battery 22 of the mobile phone unit 2 on the basis
`of the charging information transmitted from the unit 2. When
`the control board 11 grasps from the charging information the
`fact that the charging of the battery 22 has not been com
`pleted, the power transmission through the primary power
`transmission coil 10 is carried on. In contrast, when the con
`trol board 11 grasps from the charging information the fact
`that the charging of the battery 22 has been completed, it
`carries out control of terminating the power transmission. In
`addition, for example, the control board 11 carries out control
`of terminating the power transmission if it receives the infor
`mation about a certain abnormality from the mobile phone
`unit 2.
`Details of Noncontact Power-Transmission Coil
`0061.
`0062 Hereinafter, the detailed configuration of the non
`contact power-transmission coil in accordance with the
`embodiment of the present invention will be described. Here,
`in each of the embodiments as described below, the noncon
`tact power-transmission coil (secondary power-transmission
`coil 21) mainly mounted on the mobile phone unit 2 will be
`exemplified. In addition, each figure as represented below
`will be provided for illustrating the schematic configuration
`of the noncontact power-transmission coil of each embodi
`ment. The number of windings of the coil and the scale sizes,
`arrangements, and so on of the respective parts are different
`from those of an actual product. In other words, these matters
`are defined as required for facilitating the explanation of the
`present invention.
`0063.
`Details of Noncontact Power-Transmission Coil in
`which an Electric Wire is Spirally Wound
`0064 Referring to FIGS. 4 to 6, the schematic configura
`tion of a noncontact power-transmission coil 21WS having a
`planar coil in which an electric wire 40 is spirally wound will
`be described. FIG. 4 is a schematic front view of the noncon
`tact power-transmission coil 21WS in which a planar coil is
`mounted on a flexible printed-circuit board 30. FIG. 5 is a
`
`schematic front view of the flexible printed-circuit board 30
`from which the planar coil is removed. In addition, FIG. 6 is
`a schematic cross sectional view of the noncontact power
`transmission coil 21WS of the present embodiment.
`0065. As shown in FIGS. 4 to 6, the noncontact power
`transmission coil 21WS of the present embodiment includes
`the planar coil formed by spirally winding a single or twisted
`electric wire 40 coated with a surface-insulating layer on
`approximately the same plane. One flat Surface side of the
`planar coil is stuck on the surface of the flexible printed
`circuit board 30 through an adhesion sheet 42. In addition, the
`other flat Surface side of the planar coil is stuck on a magnetic
`sheet 43 through an adhesion sheet 41 so that the magnetic
`sheet 43 can entirely cover the other flat surface side of the
`planarcoil. The magnetic sheet 43 effectively forms magnetic
`paths for the planar coil and the noncontact power-transmis
`sion coil 10 of the cradle 1 to cause an increase in inter
`linkage magnetic flux, while preventing undesired radiation
`of magnetic fields generated from both of the coils. The planar
`coil can be mounted on the flexible printed-circuit board 30
`and stuck to the magnetic sheet 43 by adhesion with adhesion
`sheets 41, 43 as illustrated by an example shown in FIG. 6,
`respectively. Alternatively, for example, the mounting of the
`planarcoil may be performed by inserting an adhesive resin in
`the planar coil or between the planar coil and the printed
`circuit board 30, or the planar coil and the magnetic sheet 43.
`When the mounting is carried out by insertion of the resin as
`described above, there is no need of the adhesion sheet. It
`enables the thickness of the noncontact power-transmission
`coil to be reduced. Furthermore, though omitted from the
`figure, a metal sheet made of aluminum or the like may be
`stuck on the outside of the magnetic sheet 43 if needed. In
`addition, in contrast to the side the flexible printed-circuit
`board 30 on which the above-mentioned noncontact power
`transmission coil 21WS of the flexible printed-circuit board
`30 is stuck, the opposite side thereof is stuck on the inner wall
`surface of the battery cover 20 of the mobile phone unit 2 by
`an adhesion sheet not shown in the figure.
`0066. The flexible printed-circuit board 30 is a substrate in
`the shape of a considerably thin sheet, for example, one using
`a polyimide resin as