JP2015149833A - Electronic apparatus - Google Patents
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- JP2015149833A JP2015149833A JP2014021568A JP2014021568A JP2015149833A JP 2015149833 A JP2015149833 A JP 2015149833A JP 2014021568 A JP2014021568 A JP 2014021568A JP 2014021568 A JP2014021568 A JP 2014021568A JP 2015149833 A JP2015149833 A JP 2015149833A
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Abstract
Description
本発明は、例えば携帯端末機器等の電子機器に係り、特に例えば非接触給電用の受電コイル等を内包する金属筐体の構造に特徴を有する電子機器に関する。 The present invention relates to an electronic device such as a portable terminal device, and more particularly to an electronic device characterized by a structure of a metal casing that encloses a receiving coil for non-contact power feeding or the like.
近年、非接触給電の導入に伴って、スマートフォン等の携帯端末機器には電力伝送用のコイルアンテナが搭載されている。非接触給電に用いられる電力伝送方式としては、例えば、電磁誘導方式、電波受信方式、磁気共鳴方式等が挙げられる。 In recent years, along with the introduction of non-contact power feeding, portable terminal devices such as smartphones are equipped with coil antennas for power transmission. Examples of the power transmission method used for non-contact power feeding include an electromagnetic induction method, a radio wave reception method, a magnetic resonance method, and the like.
この中で、電磁誘導方式は、対をなすコイル間の電磁誘導を利用したもので、送電コイルで発生した磁束変化を受電コイルに鎖交させることで受電コイルに電圧を発生させるものである。この場合、送電コイル、受電コイルの近傍に金属が存在すると、送電コイルによる磁束変化により、当該金属に前記磁束変化を妨げるように電流が流れる（渦を巻くように流れるので一般に"渦電流"と称される）。 Among them, the electromagnetic induction method uses electromagnetic induction between a pair of coils, and generates a voltage in the power receiving coil by linking the magnetic flux change generated in the power transmitting coil to the power receiving coil. In this case, if a metal exists in the vicinity of the power transmission coil and the power reception coil, a current flows through the metal so as to prevent the magnetic flux change due to a magnetic flux change caused by the power transmission coil. Called).
この現象は、送電コイル、受電コイル間の磁気的結合を低下させる。特に受電コイルの送電コイル側とは反対側に金属がある場合、この渦電流の影響が顕著となるので、一般的には、高透磁率の磁性体（磁気シールド材）を受電コイルと金属の間に挿入して当該金属に渦電流が発生するのを防いでいる。 This phenomenon reduces the magnetic coupling between the power transmission coil and the power reception coil. In particular, when there is a metal on the opposite side of the power receiving coil to the power transmitting coil side, the effect of this eddy current becomes significant. Therefore, in general, a magnetic material (magnetic shield material) with high permeability is used between the power receiving coil and the metal. It is inserted in between to prevent the eddy current from being generated in the metal.
尚、特許文献１では、基材の表面上にスパイラルコイルからなるアンテナ導体と、基材の裏面に金属面を備えたトランスポンダに用いるアンテナ回路が開示されており、金属面は中央部がくり抜かれたループ形状となっており、金属面に発生する渦電流がループして流れるのを回避するために、切り込みが設けられている。 Patent Document 1 discloses an antenna circuit used for a transponder having an antenna conductor formed of a spiral coil on the surface of a base material and a metal surface on the back surface of the base material, and the metal surface is hollowed out at the center. In order to prevent the eddy current generated on the metal surface from flowing in a loop, a notch is provided.
上記のように、通常、非接触給電用アンテナは、送電コイル、受電コイル共に、その一方の面に磁気シールド材が設置された構成となっている。 As described above, the non-contact power feeding antenna usually has a configuration in which the magnetic shield material is installed on one surface of both the power transmission coil and the power reception coil.
ところで、携帯端末機器では、内部に電波通信用やＲＦＩＤ用、あるいは非接触給電用など種々のアンテナを搭載しているため、そのアンテナの通信や電力伝送を阻害しないように、従来より樹脂製の筺体が用いられることが多い。 By the way, since a mobile terminal device is equipped with various antennas for radio communication, RFID, or non-contact power feeding, it has been made of resin from the past so as not to hinder communication and power transmission of the antenna. A rod is often used.
このような中、最近では、電子機器の筐体には、デザイン性、強度等の観点から金属を用いたものもある。このような電子機器に非接触給電アンテナを搭載する場合、非接触給電アンテナを覆うように金属が配置されていると、前記のように金属筐体に渦電流が流れて送受電性能を阻害する。そのため、金属筐体の一部をくり抜いて窓部を設けて、当該窓部の内側に受電コイルを設置している。 Under such circumstances, recently, some cases have been made of metal from the viewpoints of design, strength, etc., in the case of electronic devices. When a non-contact power feeding antenna is mounted on such an electronic device, if a metal is disposed so as to cover the non-contact power feeding antenna, an eddy current flows through the metal housing as described above, thereby hindering power transmission / reception performance. . Therefore, a part of the metal casing is cut out to provide a window portion, and the power receiving coil is installed inside the window portion.
しかしながら、この場合も、窓部を大きくしておかないと、送受電時においては受電コイルの周囲の金属筐体の窓部の周囲を周回するように渦電流が発生し、送電アンテナと受電アンテナとの間の伝送効率を悪化させてしまう。 However, even in this case, if the window is not enlarged, an eddy current is generated so as to circulate around the window of the metal casing around the power receiving coil at the time of power transmission / reception. The transmission efficiency between the two will deteriorate.
尚、上述した特許文献１の技術は渦電流の影響を軽減するためのものであるが、非接触ＩＣカードとしてのトランスポンダへの適用を想定するもので、非接触給電アンテナの伝送効率の低下を抑制する目的でなされたものではない。 The technique of Patent Document 1 described above is intended to reduce the effect of eddy currents, but is assumed to be applied to a transponder as a non-contact IC card and reduces the transmission efficiency of the non-contact power feeding antenna. It was not made for the purpose of suppression.
本発明は、上記問題に鑑みてなされたもので、送電アンテナからの磁束変化により金属筐体上に流れる渦電流が大きく迂回したループを形成して流れるようにして、非接触給電アンテナの伝送効率の低下を抑制することを目的とする。 The present invention has been made in view of the above problems, and the transmission efficiency of a non-contact power feeding antenna is formed by forming a loop in which an eddy current flowing on a metal casing largely bypasses due to a change in magnetic flux from a power transmitting antenna. It aims at suppressing the fall of.
上記目的を達成するために、本発明の一態様に係る電子機器は、金属筐体の少なくとも一部を形成する金属部に窓部を設け、前記窓部に非接触給電アンテナを設置する電子機器であって、前記金属部に前記非接触給電アンテナ側から前記金属板を横断するように溝が設けられていることを特徴としている。 In order to achieve the above object, an electronic device according to one embodiment of the present invention is provided with a window portion in a metal portion that forms at least part of a metal casing, and a non-contact power feeding antenna is installed in the window portion. And the groove | channel is provided in the said metal part so that the said metal plate may be crossed from the said non-contact electric power feeding antenna side, It is characterized by the above-mentioned.
本発明の他の態様に係る電子機器は、金属筐体の少なくとも一部を形成する金属部に窓部を設け、前記窓部に非接触給電アンテナを設置する電子機器であって、前記金属筐体が前記非接触給電アンテナを囲むようにして複数に分割されていることを特徴としている。 An electronic apparatus according to another aspect of the present invention is an electronic apparatus in which a window is provided in a metal part that forms at least a part of a metal casing, and a non-contact power feeding antenna is installed in the window. The body is divided into a plurality of parts so as to surround the non-contact power feeding antenna.
本発明によれば、金属筐体に非接触給電アンテナ側から金属板を横断するように溝等を設け、或いは金属筐体を非接触給電アンテナを囲むようにして複数に分割することで、送電アンテナからの磁束変化により金属筐体上に流れる渦電流が大きく迂回したループを形成して流れるようにして、非接触給電アンテナの伝送効率の低下を抑制した電子機器を提供することができる。 According to the present invention, a groove or the like is provided in the metal housing so as to cross the metal plate from the non-contact power feeding antenna side, or the metal housing is divided into a plurality of parts so as to surround the non-contact power feeding antenna. Thus, an electronic device can be provided in which a decrease in transmission efficiency of the non-contact power feeding antenna is suppressed by forming a loop in which an eddy current flowing on the metal casing largely bypasses due to a change in magnetic flux.
以下、本発明を実施するための形態について、図面を参照しながら詳細に説明する。なお、本発明は、以下の実施形態のみに限定されるものではなく、本発明の要旨を逸脱しない範囲内において種々の変更が可能であることは勿論である。本発明は、金属筐体に窓部を設け、当該窓部に非接触給電アンテナを設置する、スマートフォン等の携帯電子機器等を概念上含む電子機器に適用されるものである。 Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. It should be noted that the present invention is not limited to the following embodiments, and various modifications can be made without departing from the scope of the present invention. The present invention is applied to an electronic device that conceptually includes a portable electronic device such as a smartphone in which a window is provided in a metal casing and a non-contact power feeding antenna is installed in the window.
はじめに、本発明の一実施形態に係る電子機器の特徴について概説すると、本発明の実施形態は、携帯端末機器等への適用を想定しており、当該機器の筺体の裏面を形成する金属板に、受電コイルの外形よりも大きい開口を設け、この開口に樹脂板を接合して窓部を形成する。そして、当該窓部から金属板の周辺端部に向けてスリット（或いは溝）を形成する。或いは、このスリットの形成に替えて、窓部を挟んで金属板を２つ以上の領域に分割する。受電コイルは、このスリットの形成された、或いは２つ以上の領域に分割された窓部の筺体内部側に配置される。以下、詳述する。 First, the characteristics of an electronic device according to an embodiment of the present invention will be outlined. The embodiment of the present invention is assumed to be applied to a mobile terminal device or the like, and a metal plate that forms the back surface of the casing of the device. An opening larger than the outer shape of the power receiving coil is provided, and a resin plate is joined to the opening to form a window portion. And a slit (or groove | channel) is formed toward the peripheral edge part of a metal plate from the said window part. Alternatively, instead of forming the slit, the metal plate is divided into two or more regions across the window. The power receiving coil is disposed inside the housing of the window portion in which the slit is formed or divided into two or more regions. Details will be described below.
図１（ａ），（ｂ）には、本発明の一実施形態に係る非接触給電機能を備えた電子機器の非接触給電を実現する送電アンテナと受電アンテナとの相対的な位置関係を示し、説明する。ここでは図示を省略するが、受電アンテナは例えば携帯端末機器等の筐体の中に収納され、後述するように筐体としては金属筐体を採用する。一方、送電アンテナは、詳細な説明は省略するが、送電用の送電ボックスの筐体の中に収納される。 1A and 1B show a relative positional relationship between a power transmitting antenna and a power receiving antenna that realizes non-contact power feeding of an electronic device having a non-contact power feeding function according to an embodiment of the present invention. ,explain. Although not shown here, the power receiving antenna is housed in, for example, a housing of a mobile terminal device or the like, and a metal housing is adopted as the housing as will be described later. On the other hand, the power transmission antenna is housed in a casing of a power transmission box for power transmission, although detailed description is omitted.
図１（ａ），（ｂ）に示されるように、受電アンテナ１０は、スパイラルコイル等の受電コイル１が、磁気シールド材２に積層された構成となっている。即ち、ここでは不図示であるが、受電コイル１は接着層を介して磁気シールド材２に接着されている。受電アンテナ１０を上面からみた様子は図２に示される通りである。同図に示されるように、磁気シールド材２は、受電コイル１の外形よりも少し大きい領域を形成している。それは、後述する金属筐体への収納を見込んだものである。 As shown in FIGS. 1A and 1B, the power receiving antenna 10 has a structure in which a power receiving coil 1 such as a spiral coil is laminated on a magnetic shield material 2. That is, although not shown here, the power receiving coil 1 is bonded to the magnetic shield material 2 via an adhesive layer. A state of the power receiving antenna 10 as seen from above is as shown in FIG. As shown in the figure, the magnetic shield material 2 forms a region slightly larger than the outer shape of the power receiving coil 1. It is expected to be housed in a metal casing described later.
一方、送電アンテナ２０は、スパイラルコイル等の送電コイル１１が、磁気シールド材１２に積層された構成となっている。ここでも、送電コイル１１は、不図示の接着層を介して磁気シールド材１２に接着されている。送電アンテナ２０は、電子機器とは別体の送電ボックスに収納されることになる。 On the other hand, the power transmission antenna 20 has a configuration in which a power transmission coil 11 such as a spiral coil is laminated on the magnetic shield material 12. Also here, the power transmission coil 11 is bonded to the magnetic shield material 12 via an adhesive layer (not shown). The power transmission antenna 20 is housed in a power transmission box separate from the electronic device.
ここで、磁気シールド材２，１２としては、Ｆｅ系、Ｆｅ−Ｓｉ系、センダスト、パーマロイ、アモルファス等の金属磁性体や、ＭｎＺｎ系フェライト、ＮｉＺｎ系フェライト、或いは、上記磁性材からなる磁性粒子に結合剤としての樹脂を加えて作製した磁性樹脂材や、磁性粒子に少量のバインダーを加えて圧縮成型して作成する圧粉成型材料を用いることができる。これらの磁性体は単独あるいは混合して用いることができる。 Here, as the magnetic shield materials 2 and 12, metal magnetic materials such as Fe-based, Fe-Si-based, Sendust, Permalloy, and amorphous, MnZn-based ferrite, NiZn-based ferrite, or magnetic particles made of the above-described magnetic material are used. A magnetic resin material prepared by adding a resin as a binder or a powder molding material prepared by compression molding by adding a small amount of binder to magnetic particles can be used. These magnetic materials can be used alone or in combination.
また、上記接着用の不図示の接着層としては、粘着性を有するものであればよく、例えば両面粘着テープや磁性樹脂シートを用いることもできる。 Further, the adhesive layer (not shown) for adhesion is not particularly limited as long as it has adhesiveness, and for example, a double-sided adhesive tape or a magnetic resin sheet can be used.
図３に示されるように、受電アンテナ１０は、ステンレス板等からなる金属筐体３に形成された窓部４に格納される。この窓部４は、金属筐体３の開口に樹脂板を接合して形成されたもので、搭載される受電アンテナ１０の外形よりも大きい開口となるように形成されている。受電アンテナ１０は、窓部４の中に不図示の接着層により接着されるか、或いは樹脂等により封止される。 As shown in FIG. 3, the power receiving antenna 10 is housed in a window portion 4 formed in a metal casing 3 made of a stainless steel plate or the like. The window portion 4 is formed by joining a resin plate to the opening of the metal housing 3 and is formed to have an opening larger than the outer shape of the power receiving antenna 10 to be mounted. The power receiving antenna 10 is bonded to the window portion 4 with an adhesive layer (not shown) or sealed with a resin or the like.
そして、本実施形態では、金属筐体３にスリット（又は溝）を入れて、送電アンテナ２０からの磁束変化により金属筐体３上に流れる渦電流が、大きく迂回したループを形成するように流れるようにすることを特徴としている。そして、図４に示されるように、ステンレス板等の金属筐体３の窓部４から金属筐体３の端部まで達するスリット（又は溝）５を形成している。換言すれば、金属筐体３に窓部４を設け、当該窓部４に受電アンテナ１０を設置する電子機器において、金属筐体３に受電アンテナ１０側から金属筐体３を横断するように１本のスリット（又は溝）５が設けられている。 In the present embodiment, slits (or grooves) are formed in the metal housing 3, and eddy currents flowing on the metal housing 3 due to a change in magnetic flux from the power transmission antenna 20 flow so as to form a largely bypassed loop. It is characterized by doing so. And as FIG. 4 shows, the slit (or groove | channel) 5 which reaches from the window part 4 of metal housings 3, such as a stainless steel plate, to the edge part of the metal housing 3 is formed. In other words, in an electronic device in which the window 4 is provided in the metal housing 3 and the power receiving antenna 10 is installed in the window 4, the metal housing 3 is crossed over the metal housing 3 from the power receiving antenna 10 side. A slit (or groove) 5 is provided.
また、他の態様では、図５に示されるように、窓部４より金属筐体の端部に向けて形成されたスリット（又は溝）５ａ，５ｂにより当該金属筐体を２つの領域３ａ，３ｂに分割している。換言すれば、金属筐体３に窓部４を設け、当該窓部４に受電アンテナ１０を設置する電子機器において、金属筐体３が非接触給電用の受電アンテナ１０を囲むようにしてスリット（又は溝）５ａ，５ｂにより複数の領域（この例では、領域３ａ，３ｂ）に分割されている。 Further, in another aspect, as shown in FIG. 5, the metal casing is divided into two regions 3a, 5b by slits (or grooves) 5a, 5b formed from the window 4 toward the end of the metal casing. It is divided into 3b. In other words, in an electronic device in which the window 4 is provided in the metal housing 3 and the power receiving antenna 10 is installed in the window 4, the metal housing 3 surrounds the power receiving antenna 10 for non-contact power feeding so that the slit (or groove). ) 5a and 5b are divided into a plurality of regions (in this example, regions 3a and 3b).
ここで、受電アンテナ１０の金属筐体への実装の様子は、図６（ａ）乃至（ｃ）に示される。即ち図６（ａ）は本発明を適用した実施形態に係る電子機器の金属筐体３の様子を示し、図６（ｂ）には当該金属筺体３への受電アンテナ１０の設置の様子を示し、図６（ｃ）には当該金属筺体３への受電アンテナ１０の他の設置の様子を示し説明する。 Here, the manner in which the power receiving antenna 10 is mounted on the metal casing is shown in FIGS. 6A shows a state of the metal casing 3 of the electronic device according to the embodiment to which the present invention is applied, and FIG. 6B shows a state of installation of the power receiving antenna 10 on the metal casing 3. FIG. 6C shows another state of installation of the power receiving antenna 10 on the metal casing 3 and will be described.
この例では、図６（ａ）に示されるように、金属筐体３は、スリット５ａ，５ｂにより２つの領域３ａ，３ｂに分割されている。そして、図６（ｂ）に示される関係では、金属筐体３の窓部４が樹脂封止材７で封止され、この封止材７に対して電子機器の内面から接着層６を介して受電アンテナ１０が受電コイル１側から接着される。この接着層６としては、両面テープや接着剤を用いることができる。一方、図６（ｃ）に示される他の関係では、金属筐体３の窓部４の電子機器外面側に保護板８が配置され、当該保護板８に受電アンテナ１０の受電コイル１側から当接するように配置され、受電アンテナ１０も含めて窓部４内が樹脂封止材７により封止される。 In this example, as shown in FIG. 6A, the metal housing 3 is divided into two regions 3a and 3b by slits 5a and 5b. In the relationship shown in FIG. 6B, the window 4 of the metal housing 3 is sealed with a resin sealing material 7, and the sealing material 7 is interposed from the inner surface of the electronic device via the adhesive layer 6. Thus, the power receiving antenna 10 is bonded from the power receiving coil 1 side. As the adhesive layer 6, a double-sided tape or an adhesive can be used. On the other hand, in another relationship shown in FIG. 6C, a protective plate 8 is disposed on the electronic device outer surface side of the window portion 4 of the metal housing 3, and the protective plate 8 is connected to the power receiving antenna 10 from the power receiving coil 1 side. It arrange | positions so that it may contact | abut and the inside of the window part 4 including the power receiving antenna 10 is sealed with the resin sealing material 7. FIG.
このように、本発明の実施形態に係る電子機器では、金属筐体３に非接触給電用の受電アンテナ１０側から金属筺体３を横断するようにスリット（又は溝）５が設けられており（図４参照）、或いは金属筐体３が非接触給電用の受電アンテナ１０を囲むようにしてスリット（又は溝）５ａ，５ｂにより複数に分割（領域３ａ，３ｂ）されているので、送電アンテナからの磁束変化により金属筐体３上に流れる渦電流が、大きく迂回したループを形成するように流れることになり、非接触給電アンテナの伝送効率の低下を抑制することができる。 Thus, in the electronic device according to the embodiment of the present invention, the metal housing 3 is provided with the slits (or grooves) 5 so as to cross the metal housing 3 from the power receiving antenna 10 side for non-contact power feeding ( 4), or the metal casing 3 is divided into a plurality of regions (regions 3a and 3b) by slits (or grooves) 5a and 5b so as to surround the power receiving antenna 10 for non-contact power feeding, so that the magnetic flux from the power transmitting antenna Due to the change, the eddy current flowing on the metal casing 3 flows so as to form a largely detoured loop, and a decrease in transmission efficiency of the non-contact power feeding antenna can be suppressed.
本発明では、実施例として、先に図１（ａ），（ｂ）に示した位置関係で、図２乃至図５の各状態を電磁界解析ソフトウェアを用いて解析した。 In the present invention, as an example, the states shown in FIGS. 2 to 5 were analyzed using electromagnetic field analysis software based on the positional relationship shown in FIGS. 1A and 1B.
即ち、送電アンテナ２０と受電アンテナ１０を対向させて、送電コイル１１に磁界を発生させた（送電）ときの受電コイル１に発生する電流をシミュレーションによって解析した。このとき、金属筺体に相当するステンレス板を受電コイルに近接させている。 That is, the current generated in the power receiving coil 1 when the power transmitting antenna 20 and the power receiving antenna 10 face each other and a magnetic field is generated in the power transmitting coil 11 (power transmission) was analyzed by simulation. At this time, a stainless steel plate corresponding to the metal casing is brought close to the power receiving coil.
解析にあたっては、金属筐体は、厚さ０．２５ｍｍのステンレスとし、窓部の寸法及び受電アンテナの大きさはそれぞれ３１×３１ｍｍ、３０×３０ｍｍとした。また、送電アンテナ２０はＷＰＣ規格 「System Description Wireless Power Transfer Volume1 :Low Power」記載のデザインＡ１０に準じたものとした。但し、解析では、受電コイル１、送電コイル１１共に１Ｔで解析している。その解析結果を表１に示す。 In the analysis, the metal casing was made of stainless steel having a thickness of 0.25 mm, and the size of the window portion and the size of the power receiving antenna were 31 × 31 mm and 30 × 30 mm, respectively. The power transmission antenna 20 conforms to the design A10 described in the WPC standard “System Description Wireless Power Transfer Volume 1: Low Power”. However, in the analysis, both the power receiving coil 1 and the power transmitting coil 11 are analyzed at 1T. The analysis results are shown in Table 1.
ここでは、図２に示したように金属筐体に入れない場合に受電コイル１に流れる電流を１として、各構成（図３乃至図５）での受電コイル１に流れる電流を比較している。図３に示すように金属筐体３に収納した構成の場合では電流が約５％低下するのに対し、図４に示すように金属筺体３にスリット５を入れた構成、図５に示すように金属筐体３をスリット５ａ，５ｂにより２つの領域（３ａ，３ｂ）に分割した構成では、ほとんど電流の低下がみられなかった。これは、スリット（又は溝）を入れた構成が、渦電流の影響を軽減していることを意味する。 Here, as shown in FIG. 2, the current flowing through the power receiving coil 1 when it cannot be put in the metal casing is defined as 1, and the current flowing through the power receiving coil 1 in each configuration (FIGS. 3 to 5) is compared. . In the case of the configuration housed in the metal housing 3 as shown in FIG. 3, the current decreases by about 5%, whereas the configuration in which the slit 5 is inserted in the metal housing 3 as shown in FIG. 4, as shown in FIG. Further, in the configuration in which the metal casing 3 is divided into two regions (3a, 3b) by the slits 5a, 5b, almost no decrease in current was observed. This means that the configuration with slits (or grooves) reduces the effects of eddy currents.
一方、図７乃至９は、送電アンテナ側で発生した磁束の変化に伴い、金属筐体３に発生した電流を解析したものである。 On the other hand, FIGS. 7 to 9 show the analysis of the current generated in the metal housing 3 with the change of the magnetic flux generated on the power transmission antenna side.
これらの図７乃至９からも、金属筐体３にスリット、分割がない場合、金属筐体窓部に沿って強い電流が流れているのに対し（図７参照）、金属筺体３にスリット、分割があるものでは、金属筐体３に流れる電流が大きく迂回していることが分かる（図８，９参照）。このため、スリット、分割があるものでは、送電アンテナ２０で発生した磁束を打ち消す効果が抑制され、金属筐体３がない場合と略同程度の電流が受電コイル１に流れることが明らかとなった。 7 to 9, when the metal housing 3 has no slit or division, a strong current flows along the metal housing window (see FIG. 7), whereas the metal housing 3 has a slit, In the case where there is a division, it can be seen that the current flowing through the metal casing 3 is largely detoured (see FIGS. 8 and 9). For this reason, in the case where there are slits and divisions, the effect of canceling the magnetic flux generated in the power transmission antenna 20 is suppressed, and it has become clear that substantially the same current flows in the power receiving coil 1 as in the case where there is no metal housing 3. .
このように、図７乃至図９の比較からも、金属筺体３としてのステンレス板にスリットを設けることで、或いは複数領域に分割することで、渦電流の影響が軽減され、受電効率が向上することが明らかとなった。 Thus, also from the comparison of FIG. 7 to FIG. 9, the effect of eddy current is reduced and the power receiving efficiency is improved by providing a slit in the stainless steel plate as the metal casing 3 or by dividing into a plurality of regions. It became clear.
以上詳述したように、本発明に係る電子機器では、金属筐体に前記非接触給電アンテナ側から前記金属筺体を横断するように溝が設けられており、また前記金属筐体が前記非接触給電アンテナを囲むようにして複数に分割されているので、送電アンテナユニットからの磁束変化により金属筐体上に流れる渦電流が、大きく迂回したループを形成するように流れることになり、非接触給電アンテナの伝送効率の低下を抑制することができる。 As described above in detail, in the electronic device according to the present invention, a groove is provided in the metal casing so as to cross the metal casing from the non-contact power feeding antenna side, and the metal casing is in the non-contact state. Since it is divided into a plurality of parts so as to surround the power supply antenna, the eddy current flowing on the metal casing due to the magnetic flux change from the power transmission antenna unit flows so as to form a largely bypassed loop. A reduction in transmission efficiency can be suppressed.
１ 受電コイル
２，１２ 磁気シールド材
３，３ａ，３ｂ 金属筐体
４ 受電アンテナ用窓
５ 溝
６ 接着層
７ 樹脂封止材
８ 保護板
１０ 受電アンテナ
１１ 送電コイル
２０ 送電アンテナ
DESCRIPTION OF SYMBOLS 1 Power receiving coil 2,12 Magnetic shield material 3,3a, 3b Metal housing 4 Power receiving antenna window 5 Groove 6 Adhesive layer 7 Resin sealing material 8 Protective plate 10 Power receiving antenna 11 Power transmitting coil 20 Power transmitting antenna
Claims (2)
前記金属部に前記非接触給電アンテナ側から前記金属板を横断するように溝が設けられていること
を特徴とする電子機器。 An electronic device in which a window part is provided in a metal part that forms at least a part of a metal housing, and a non-contact power feeding antenna is installed in the window part,
An electronic device, wherein a groove is provided in the metal portion so as to cross the metal plate from the non-contact power feeding antenna side.
前記金属筐体が前記非接触給電アンテナを囲むようにして複数に分割されていること
を特徴とする電子機器。 An electronic device in which a window part is provided in a metal part that forms at least a part of a metal housing, and a non-contact power feeding antenna is installed in the window part,
An electronic apparatus, wherein the metal casing is divided into a plurality so as to surround the non-contact power feeding antenna.
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| JP2014021568A JP2015149833A (en) | 2014-02-06 | 2014-02-06 | Electronic apparatus |
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| JP2014021568A JP2015149833A (en) | 2014-02-06 | 2014-02-06 | Electronic apparatus |
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| JP2015149833A true JP2015149833A (en) | 2015-08-20 |
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