1111111111111111 IIIIII IIIII 111111111111111 1111111111 111111111111111 IIIII 1111111111 11111111
`US 20140306656Al
`
`c19) United States
`c12) Patent Application Publication
`Tabata et al.
`
`c10) Pub. No.: US 2014/0306656 Al
`Oct. 16, 2014
`(43) Pub. Date:
`
`(54) NON-CONTACT CHARGING MODULE AND
`PORTABLE TERMINAL PROVIDED WITH
`SAME
`
`(71) Applicant: Panasonic Corporation, Osaka (JP)
`
`(72)
`
`Inventors: Kenichiro Tabata, Oita (JP); Shuichiro
`Yamaguchi, Oita (JP); Munenori
`Fujimura, Oita (JP); Akio Hidaka, Oita
`(JP); Takumi Naruse, Miyazaki (JP)
`
`(21) Appl. No.:
`
`14/359,564
`
`(22) PCT Filed:
`
`Dec. 4, 2012
`
`(86) PCT No.:
`
`PCT I JP2012/007775
`
`§ 371 (c)(l),
`(2), ( 4) Date: May 20, 2014
`
`(30)
`
`Foreign Application Priority Data
`
`Dec. 7, 2011
`Dec. 7, 2011
`Dec. 7, 2011
`
`(JP) ................................. 2011-267964
`(JP) ................................. 2011-267965
`(JP) ................................. 2011-267966
`
`Publication Classification
`
`(51)
`
`Int. Cl.
`H02J 7102
`H04B 5100
`H0JF 38/14
`(52) U.S. Cl.
`CPC ................ H02J 71025 (2013.01); H0JF 38/14
`(2013.01); H04B 510037 (2013.01)
`USPC .......................................................... 320/108
`
`(2006.01)
`(2006.01)
`(2006.01)
`
`(57)
`
`ABSTRACT
`
`Provided is a non-contact charging module for which minia(cid:173)
`turization is achieved by making a non-contact charging coil,
`an NFC antenna, and a magnetic sheet into one module, and
`which enables transmission and power propagation in the
`same direction. This device of the present invention is pro(cid:173)
`vided with a charging coil comprising a wound lead wire, an
`NFC coil disposed so as to surround the charging coil, and a
`magnetic sheet that holds the charging coil and the NFC coil
`from the same direction. The number of turns of the charging
`coil is greater than that of the NFC coil.
`
`Ex.1007
`APPLE INC. / Page 1 of 27
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`

`US 2014/0306656 Al
`
`Oct. 16, 2014
`
`1
`
`NON-CONTACT CHARGING MODULE AND
`PORTABLE TERMINAL PROVIDED WITH
`SAME
`
`TECHNICAL FIELD
`
`[ 0001] The present invention relates to a non-contact charg(cid:173)
`ing module including a non-contact charging module and an
`NFC antenna, as well as a portable terminal that includes the
`non-contact charging module.
`
`BACKGROUND ART
`
`[0002]
`In recent years, NFC (Near Field Communication)
`antennas that utilize RFID (Radio Frequency IDentification)
`technology and use radio waves in the 13.56 MHz band and
`the like are being used as antennas that are mounted in com(cid:173)
`munication apparatuses such as portable terminal devices. To
`improve the communication efficiency, an NFC antenna is
`provided with a magnetic sheet that improves the communi(cid:173)
`cation efficiency in the 13.56 MHz band and thus configured
`as an NFC antenna module. Technology has also been pro(cid:173)
`posed in which a non-contact charging module is mounted in
`a communication apparatus, and the communication appara(cid:173)
`tus is charged by non-contact charging. According to this
`technology, a power transmission coil is disposed on the
`charger side and a power reception coil is provided on the
`communication apparatus side, electromagnetic induction is
`generated between the two coils at a frequency in a band
`between approximately 100 kHz and 200 kHz to thereby
`transfer electric power from the charger to the communica(cid:173)
`tion apparatus side. To improve the communication effi(cid:173)
`ciency, the non-contact charging module is also provided with
`a magnetic sheet that improves the efficiency of communica(cid:173)
`tion in the band between approximately 100 kHz and 200
`kHz.
`[0003] Portable terminals that include such NFC modules
`and non-contact charging modules have also been proposed
`(for example, see PTL 1).
`
`CITATION LIST
`
`Patent Literature
`
`[0004] PTL 1
`[0005]
`Japanese Patent No. 4669560
`
`SUMMARY OF INVENTION
`
`Technical Problem
`
`[0006] The term "NFC" refers to short-range wireless com(cid:173)
`munication that achieves communication by electromagnetic
`induction using a frequency in the 13.56 MHz band. Further,
`non-contact charging transmits power by electromagnetic
`induction using a frequency in a band between approximately
`100 kHz and 200 kHz. Accordingly, an optimal magnetic
`sheet for achieving highly efficient communication (power
`transmission) in the respective frequency bands differs
`between an NFC module and a non-contact charging module.
`On the other hand, since both the NFC module and the non(cid:173)
`contact charging module perform communication (power
`transmission) by electromagnetic induction, the NFC module
`and the non-contact charging module are liable to interfere
`with each other. That is, there is a possibility that when one of
`the modules is performing communication, the other module
`will take some of the magnetic flux, and there is also the
`
`possibility that an eddy current will be generated in the other
`coil and weaken electromagnetic induction of the one module
`that is performing communication.
`[0007] Therefore, in PTL 1, the NFC module and the non(cid:173)
`contact charging module each include a magnetic sheet and
`are each arranged as a module, which in turn hinders minia(cid:173)
`turization of the communication apparatus. The communica(cid:173)
`tion directions of the NFC module and the non-contact charg(cid:173)
`ing module are made to differ so that mutual interference does
`not arise when the respective modules perform communica(cid:173)
`tion, and as a result the communication apparatus is
`extremely inconvenient because the communication surface
`changes depending on the kind of communication. In addi(cid:173)
`tion, in recent years there has been an increase in the use of
`smartphones in which a large proportion of one surface of the
`casing serves as a display portion, so that if the aforemen(cid:173)
`tioned communication apparatus is applied to a smartphone it
`is necessary to perform one of the kinds of communication on
`the surface where the display section exists.
`[0008] An object of the present invention is to provide a
`non-contact charging module that enables a reduction in size
`by making a non-contact charging coil, an NFC antenna, and
`a magnetic sheet into a single module, and that enables com(cid:173)
`munication and power transmission in the same direction, and
`also to provide a portable terminal including the non-contact
`charging module.
`
`Solution to Problem
`
`[0009] To solve the above mentioned problem, a non-con(cid:173)
`tact charging module according to an aspect of the present
`invention includes: a charging coil that comprises: a coil
`portion formed of a wound conducting wire; and two leg
`portions that extend from both ends of the conducting wire
`corresponding to a winding start point and a winding end
`point of the coil portion, respectively, an NFC coil that is
`disposed so as to surround the charging coil; a magnetic sheet
`that supports the charging coil and the NFC coil from a same
`direction; and a slit that is formed in the magnetic sheet,
`wherein at least a part of each of the two leg portions of the
`charging coil is housed in the slit, wherein the part of each of
`the two leg portions housed in the slit includes a part that
`overlaps with the NFC coil.
`
`Advantageous Effects oflnvention
`
`[0010] According to the present invention, a non-contact
`charging module and a communication apparatus that enable
`a reduction in size by making a non-contact charging coil, an
`NFC antenna, and a magnetic sheet into a single module, that
`can ease adverse effects by modularization and that also
`enable communication and power transmission in the same
`direction.
`
`BRIEF DESCRIPTION OF DRAWINGS
`
`[0011] FIGS. lA and lB are an assembly perspective dia(cid:173)
`gram of a non-contact charging module and a top view of an
`NFC coil according to an embodiment of the present inven(cid:173)
`tion;
`[0012] FIG. 2 is a top view of a charging coil according to
`the embodiment of the present invention;
`[0013] FIGS. 3A and 3B are a top view of a second mag(cid:173)
`netic sheet and a top view of a first magnetic sheet according
`to the embodiment of the present invention;
`
`Ex.1007
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`US 2014/0306656 Al
`
`Oct. 16, 2014
`
`2
`
`[0014] FIGS. 4A to 4D illustrate relations between a pri(cid:173)
`mary-side non-contact charging module that includes a mag(cid:173)
`net, and a charging coil;
`[0015] FIG. 5 illustrates a relation between the size of an
`inner diameter of a hollow portion of a charging coil and an L
`value of the charging coil when an outer diameter of the
`hollow portion of the charging coil is kept constant with
`respect to a case where a magnet is provided in a primary-side
`non-contact charging module and a case where a magnet is
`not provided therein;
`[0016] FIG. 6 illustrates a relation between an L value of a
`charging coil and a percentage of hollowing of a center por(cid:173)
`tion with respect to a case where a magnet is provided in a
`primary-side non-contact charging module and a case where
`a magnet is not provided therein;
`[0017] FIGS. 7 A and 7B illustrate a top view and a bottom
`view of the non-contact charging module according to the
`present embodiment;
`[0018] FIGS. SA and 8B are sectional views of the non(cid:173)
`contact charging module according to the embodiment;
`[0019] FIG. 9 is a schematic diagram illustrating a first
`magnetic sheet that includes an L-shaped slit according to the
`embodiment;
`[0020] FIG. 10 illustrates a frequency characteristic of the
`magnetic permeability of the first magnetic sheet (Mn-Zn
`ferrite sintered body) according to the embodiment;
`[0021] FIG. 11 illustrates a frequency characteristic of the
`magnetic permeability of a second magnetic sheet (Ni-Zn
`ferrite sintered body) according to the embodiment;
`[0022] FIG. 12 illustrates a frequency characteristic of a Q
`value of the second magnetic sheet according to the embodi(cid:173)
`ment; and
`[0023] FIGS. 13A to 13E are sectional views that schemati(cid:173)
`cally illustrate a portable terminal including the non-contact
`charging module according to the embodiment.
`
`DESCRIPTION OF EMBODIMENT
`
`Embodiment
`
`Regarding Non-Contact Charging Module
`
`[0024] Hereunder, an overview of a non-contact charging
`module according to an embodiment of the present invention
`will be described using FIGS. IA and 1B to FIGS. 3A and 3B.
`FIGS. lA and 1B to FIGS. 3A and 3B are schematic diagrams
`of a non-contact charging module (hereunder, referred to as
`"non-contact charging module 100") according to the
`embodiment of the present invention. FIG. lA is an assembly
`perspective diagram of the non-contact charging module.
`FIG. 1B is a top view of an NFC coil. FIG. 2 is a top view of
`a charging coil. FIG. 3A is a top view of a second magnetic
`sheet. FIG. 3B is a top view of a first magnetic sheet.
`[0025] Non-contact charging module 100 of the present
`embodiment includes: charging coil 30 that includes a wound
`conducting wire; NFC coil 40 that is disposed so as to sur(cid:173)
`round charging coil 30; and first magnetic sheet 10 that sup(cid:173)
`ports charging coil 30 and NFC coil 40 from the same direc(cid:173)
`tion.
`[0026] Non-contact charging module 100 includes a sheet(cid:173)
`like first magnetic sheet 10 that includes an upper face and a
`lower face in an opposite direction. Second magnetic sheet 20
`is disposed on a part of the upper face of first magnetic sheet
`10. Second magnetic sheet 20 also has a sheet-like form and
`includes an upper face and a lower face in an opposite direc-
`
`tion, and furthermore, is formed in a square shape that has a
`through-hole at a center portion thereof. Charging coil 30 is
`disposed on the upper face of first magnetic sheet 10 within
`the through-hole of second magnetic sheet 20, with the lower
`face of charging coil 30 that is wound in a planar shape being
`adhered to the upper face of first magnetic sheet 10, and the
`circumference of charging coil 30 being surrounded by sec(cid:173)
`ond magnetic sheet 20. NFC coil 40 is provided on the upper
`face of second magnetic sheet 20 and is wound around the
`circumference of charging coil 30 at a fixed distance from
`charging coil 30. An insulative double-faced tape or adhesive
`or the like is used to adhere the upper face of first magnetic
`sheet 10 and the lower face of second magnetic sheet 20, to
`adhere the upper face of first magnetic sheet 10 and the lower
`face of charging coil 30, and to adhere the upper face of
`second magnetic sheet 20 and the lower face of NFC coil 40.
`It is advantageous to arrange the entire charging coil 30 on
`first magnetic sheet 10 so as not to protrude therefrom, and to
`arrange the entire NFC coil 40 on second magnetic sheet 20 so
`as not to protrude therefrom. It is advantageous to arrange
`second magnetic sheet 20 so as not to protrude from first
`magnetic sheet 10. Adopting such a configuration can
`improve the communication efficiency of both charging coil
`30 and NFC coil 40. Note that slit 11 is formed in first
`magnetic sheet 10. The shape of slit 11 may be the shape
`shown in FIG. lA (a shape as shown in FIG. 9 that is
`described later), or may be the shape shown in FIG. 3A.
`
`Regarding Charging Coil
`
`[0027] The charging coil will be described in detail using
`FIG. lB.
`[0028]
`In the present embodiment, charging coil 30 is
`wound in a substantially square shape, but may be wound in
`any shape such as a substantially rectangular shape including
`a substantially oblong shape, a circular shape, an elliptical
`shape, and a polygonal shape.
`[0029] The charging coil has two leg portions (terminals)
`32a and 32b as a starting end and a terminating end thereof,
`and includes a litz wire constituted by around 8 to 15 con(cid:173)
`ducting wires having a diameter of approximately 0.1 mm or
`a plurality of wires (preferably, around 2 to 15 conducting
`wires having a diameter of0.08 mm to 0.3 mm) that is wound
`around a hollow portion as though to draw a swirl on the
`surface. For example, in the case of a coil including a wound
`litz wire made of 12 conducting wires having a diameter of
`0.1 mm, in comparison to a coil including a single wound
`conducting wire having the same cross-sectional area, the
`alternating-current resistance decreases considerably due to
`the skin effect. If the alternating-current resistance decreases
`while the coil is operating, heat generation by the coil
`decreases and thus charging coil 30 that has favorable thermal
`properties can be realized. At this time, if a litz wire that
`includes 8 to 15 conducting wires having a diameter of0.08
`mm to 1.5 mm is used, favorable power transfer efficiency can
`be achieved. If a single wire is used, it is advantageous to use
`a conducting wire having a diameter between 0.2 mm and 1
`mm. Further, for example, a configuration may also be
`adopted in which, similarly to a litz wire, a single conducting
`wire is formed of three conducting wires having a diameter of
`0.2 mm and two conducting wires having a diameter of 0.3
`mm. Terminals 32a and 32b as a current supply section supply
`a current from a commercial power source that is an external
`power source to charging coil 30. Note that an amount of
`
`Ex.1007
`APPLE INC. / Page 16 of 27
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`US 2014/0306656 Al
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`Oct. 16, 2014
`
`3
`
`current that flows through charging coil 30 is between
`approximately 0.4 A and 2 A. In the present embodiment the
`amount of current is 0.7 A.
`[0030]
`In charging coil 30 of the present embodiment, a
`distance between facing sides ( a length of one side) of the
`hollow portion having a substantially square shape is 20 mm
`(between 15 mm and 25 mm is preferable), and a distance
`between facing sides ( a length of one side) at an outer edge of
`the substantially square shape is 35 mm (between 25 mm and
`45 mm is preferable). Charging coil 30 is wound in a donut
`shape. In a case where charging coil 30 is wound in a sub(cid:173)
`stantially oblong shape, with respect to facing sides of the
`hollow portion of the substantially oblong shape, a distance
`between short sides ( a length of one side) is 15 mm (between
`10 mm and 20 mm is preferable) and a distance between long
`sides ( a length of one side) is 23 mm (between 15 mm and 30
`mm is preferable). Further, with respect to facing sides at an
`outer edge of a substantially square shape, a distance between
`short sides ( a length of one side) is 28 mm (between 15 mm
`and 35 mm is preferable) and a distance between long sides ( a
`length of one side) is 36 mm (between 20 mm and 45 mm is
`preferable). In a case where charging coil 30 is wound in a
`circular shape, the diameter of the hollow portion is 20 mm
`(between 10 mm and 25 mm is preferable) and the diameter of
`an outer edge of the circular shape is 35 mm (between 25 mm
`and 45 mm is preferable).
`[0031] Further, in some cases charging coil 30 utilizes a
`magnet for aligmnent with a coil of a non-contact charging
`module inside a charger that supplies power to charging coil
`30 as a counterpart for power transmission. A magnet in such
`a case is defined by the standard (WPC) as a circular ( coin
`shaped) neodymium magnet having a diameter of approxi(cid:173)
`mately 15.5 mm (approximately 10 mm to 20 mm) and a
`thickness of approximately 1.5 to 2 mm or the like. A favor(cid:173)
`able strength of the magnet is approximately 75 mT to 150
`mT. Since an interval between a coil of the primary-side
`non-contact charging module and charging coil 30 is around
`2 to 5 mm, it is possible to adequately perform alignment
`using such a magnet. The magnet is disposed in a hollow
`portion of the non-contact charging module coil on the pri(cid:173)
`mary side or secondary side. In the present embodiment, the
`magnet is disposed in the hollow portion of charging coil 30.
`[0032] That is, for example, the following methods may be
`mentioned as an aligning method. For example, a method is
`available in which a protruding portion is formed in a charg(cid:173)
`ing surface of a charger, a recessed portion is formed in an
`electronic device on the secondary side, and the protruding
`portion is fitted into the recessed portion to thereby physically
`(geometrically) perform compulsory aligning. A method is
`also available in which a magnet is mounted on at least one of
`the primary side and secondary side, and alignment is per(cid:173)
`formed by attraction between the respective magnets or
`between a magnet on one side and a magnetic sheet on the
`other side. According to another method, the primary side
`detects the position of a coil of the secondary side and auto(cid:173)
`matically moves a coil on the primary side to the position of
`the coil on the secondary side. Other available methods
`include a method in which a large number of coils are pro(cid:173)
`vided in a charger so that a portable device can be charged at
`every place on the charging surface of the charger.
`[0033] Thus, various methods can be mentioned as com(cid:173)
`mon methods for aligning the coils of the primary-side
`(charging-side) non-contact charging module and the second(cid:173)
`ary-side (charged-side) non-contact charging module, and the
`
`methods are divided into methods that use a magnet and
`methods that do not use a magnet. Non-contact charging
`module 100 is configured to be adaptable to both of a primary
`side (charging-side) non-contact charging module that uses a
`magnet and a primary-side non-contact charging module that
`does not use a magnet. Therefore, charging can be performed
`regardless of the type of primary-side non-contact charging
`module, which in tum, improves the convenience of the mod(cid:173)
`ule.
`[0034] The influence that a magnet has on the power trans(cid:173)
`mission efficiency of non-contact charging module 100 will
`be described.
`[0035] When magnetic flux for electromagnetic induction
`is generated between the primary-side non-contact charging
`module and non-contact charging module 100 to transmit
`power, the presence of a magnet between or around the pri(cid:173)
`mary-side non-contact charging module and non-contact
`charging module 100 leads extension of the magnetic flux to
`avoid the magnet. Otherwise, the magnetic flux that passes
`through the magnet becomes an eddy current or generates
`heat in the magnet and is lost. Furthermore, if the magnet is
`disposed in the vicinity of first magnetic sheet 10, first mag(cid:173)
`netic sheet 10 that is in the vicinity of the magnet saturates and
`the magnetic permeability thereof decreases. Therefore, the
`magnet that is included in the primary-side non-contact
`charging module may decrease an L value of charging coil 30.
`As a result, transmission efficiency between the non-contact
`charging modules will decrease. To prevent this, in the
`present embodiment the hollow portion of charging coil 30 is
`made larger than the magnet. That is, the area of the hollow
`portion is made larger than the area of a circular face of the
`coin-shaped magnet, and an inside edge (portion surrounding
`the hollow portion) of charging coil 30 is configured to be
`located at a position that is on the outer side relative to the
`outer edge of the magnet. Further, because the diameter of the
`magnet is 15.5 mm or less, it is sufficient to make the hollow
`portion larger than a circle having a diameter of 15.5 mm. As
`another method, charging coil 30 may be wound in a substan(cid:173)
`tially oblong shape, and a diagonal of the hollow portion
`having a substantially oblong shape may be made longer than
`the diameter (maximum 15.5 mm) of the magnet. As a result,
`since the comer portions (four corners) at which the magnetic
`flux concentrates of charging coil 30 that is wound in a sub(cid:173)
`stantially oblong shape are positioned on the outer side rela(cid:173)
`tive to the magnet, the influence of the magnet can be sup(cid:173)
`pressed. Effects obtained by employing the above described
`configuration are described hereunder.
`[0036] FIGS. 4A to 4D illustrate relations between the pri(cid:173)
`mary-side non-contact charging module including the mag(cid:173)
`net, and the charging coil. FIG. 4A illustrates a case where the
`aligning magnet is used when the inner width of the wound
`charging coil is small. FIG. 4B illustrates a case where the
`aligning magnet is used when the inner width of the wound
`charging coil is large. FIG. 4C illustrates a case where the
`aligning magnet is not used when the inner width of the
`wound charging coil is small. FIG. 4D illustrates a case where
`the aligning magnet is not used when the inner width of the
`wound charging coil is large.
`[0037] Primary-side non-contact charging module 200 that
`is disposed inside the charger includes primary-side coil 210,
`magnet 220, and a magnetic sheet (not illustrated in the draw(cid:173)
`ings). In FIGS. 4A to 4D, first magnetic sheet 10, second
`magnetic sheet 20, and charging coil 30 inside non-contact
`charging module 100 are schematically illustrated.
`
`Ex.1007
`APPLE INC. / Page 17 of 27
`
`

`

`US 2014/0306656 Al
`
`Oct. 16, 2014
`
`4
`
`[ 0038] Non-contact charging module 100 and primary-side
`non-contact charging module 200 are aligned so that primary(cid:173)
`side coil 210 and charging coil 30 face each other.A magnetic
`field is generated between inner portion 211 of primary-side
`coil 210 and inner portion 33 of charging coil 30 and power is
`transmitted. Inner portion 211 and inner portion 33 face each
`other. Inner portion 211 and inner portion 33 are close to
`magnet 220 and are liable to be adversely affected by magnet
`220.
`In addition, because magnet 220 is disposed in the
`[0039]
`vicinity of first magnetic sheet 10 and second magnetic sheet
`20, the magnetic permeability of the magnetic sheets in the
`vicinity of magnet 220 decreases. Naturally, second magnetic
`sheet 20 is closer than first magnetic sheet 10 to magnet 220,
`and is more liable to be affected by magnet 220. Therefore,
`magnet 220 included in primary-side non-contact charging
`module 200 weakens the magnetic flux of primary-side coil
`210 and charging coil 30, particularly, at inner portion 211
`and inner portion 33, and exerts an adverse effect. As a result,
`the transmission efficiency of the non-contact charging
`decreases. Accordingly, in the case illustrated in FIG. 4A,
`inner portion 33 that is liable to be adversely affected by
`magnet 220 is large.
`In contrast, in the case illustrated in FIG. 4C in
`[0040]
`which a magnet is not used, the L value increases because the
`number of turns of charging coil 30 is large. As a result, since
`there is a significant decrease in the numerical value from the
`L value in FIG. 4C to the L value in FIG. 4A, when using a
`wound coil having a small inner width, the L-value decrease
`rate with respect to an L value in a case where magnet 220 is
`included for alignment and an L value in a case where magnet
`220 is not included is extremely large.
`[0041] Further, if the inner width of charging coil 30 is
`smaller than the diameter of magnet 220 as illustrated in FIG.
`4A, charging coil 30 is directly adversely affected by magnet
`220 to a degree that corresponds to the area of charging coil 30
`that faces magnet 220. Accordingly, it is better for the inner
`width of charging coil 30 to be larger than the diameter of
`magnet 220.
`In contrast, when the inner width of charging coil 30
`[0042]
`is large as illustrated in FIG. 4B, inner portion 33 that is liable
`to be adversely affected by magnet 220 is extremely small.
`Alternatively, magnet 220 is not used.
`In the case illustrated in FIG. 4D, the L value is
`[0043]
`smaller than in FIG. 4C because the number of turns of
`charging coil 30 is less. Consequently, because a decrease in
`the numerical value from the L value in the case illustrated in
`FIG. 4D to the L value in the case illustrated in FIG. 4B is
`small, the L-value decrease rate can be suppressed to a small
`amount in the case of coils that have a large inner width.
`Further, as the inner width of charging coil 30 increases, the
`influence of magnet 220 can be suppressed because the dis(cid:173)
`tance from magnet 220 to the edge of the hollow portion of
`charging coil 30 increases.
`[0044] Since non-contact charging module 100 is mounted
`in an electronic device or the like, charging coil 30 cannot be
`made larger than a certain size. Accordingly, if the inner width
`of charging coil 30 is made large to reduce the adverse effects
`from magnet 220, the number of turns will decrease and the L
`value itself will decrease regardless of the presence or
`absence of a magnet. Therefore, charging coil 30 can be
`increased to the maximum size in a case where the area of
`magnet 220 and the area of the hollow portion of charging coil
`30 are substantially the same (the outer diameter of magnet
`
`220 is about O to 2 mm smaller than the inner width of
`charging coil 30, or the area of magnet 220 is a proportion of
`about 7 5% to 95% relative to the area of the hollow portion of
`charging coil 30). Hence, the accuracy of the alignment
`between the primary-side non-contact charging module and
`the secondary-side non-contact charging module can be
`improved. Further, if the area of magnet 220 is less than the
`area of the hollow portion of