JP2019041273A - Coil antenna and electronic device - Google Patents

Coil antenna and electronic device Download PDF

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JP2019041273A
JP2019041273A JP2017162595A JP2017162595A JP2019041273A JP 2019041273 A JP2019041273 A JP 2019041273A JP 2017162595 A JP2017162595 A JP 2017162595A JP 2017162595 A JP2017162595 A JP 2017162595A JP 2019041273 A JP2019041273 A JP 2019041273A
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coil
conductor
coil conductor
opening
antenna
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JP6702282B2 (en
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博宣 高橋
Hironori Takahashi
博宣 高橋
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Murata Manufacturing Co Ltd
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Murata Manufacturing Co Ltd
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Abstract

To increase a Q value while keeping the degree of coupling with a transmission-side antenna.SOLUTION: A coil antenna 2 comprises a coil conductor 6 having a coil opening 60. The coil conductor 6 includes: a first coil conductor unit 64a (64b); a second coil conductor unit 65a (65b); and a third coil conductor unit 66a (66b). The second coil conductor unit 65a (65b) is provided apart from the coil opening 60 in comparison to the first coil conductor unit 64a (64b). The third coil conductor unit 66a (66b) is provided apart from the coil opening 60 in comparison to the second coil conductor unit 65a (65b). A conductor line width W13 (W23) of the third coil conductor unit 66a (66b) is thicker than a conductor line width W11 (W21) of the first coil conductor unit 64a (64b), and thinner than a conductor line width W12 (W22) of the second coil conductor unit 65a (65b).SELECTED DRAWING: Figure 1

Description

本発明は、コイルアンテナ及び電子機器に関する。   The present invention relates to a coil antenna and an electronic device.

従来、コイル導体の導体線幅が位置によって異なるコイルアンテナが知られている(例えば特許文献1参照)。   Conventionally, a coil antenna is known in which the conductor line width of the coil conductor differs depending on the position (see, for example, Patent Document 1).

特許文献1に記載されたコイルアンテナでは、コイル開口の重心とコイル導体の最外周とを結ぶ直線上において、コイル開口の重心から離れるほどコイル導体の導体線幅が太くなっている。つまり、特許文献1には、コイル導体の外周側よりもコイル導体の内周側のほうが導体線幅の細いパターンが開示されている。   In the coil antenna described in Patent Document 1, the conductor line width of the coil conductor increases as the distance from the center of gravity of the coil opening increases on a straight line connecting the center of gravity of the coil opening and the outermost periphery of the coil conductor. That is, Patent Document 1 discloses a pattern in which the conductor line width is narrower on the inner peripheral side of the coil conductor than on the outer peripheral side of the coil conductor.

米国特許出願公開第2017/0040695号明細書US Patent Application Publication No. 2017/0040695

しかしながら、特許文献1に記載された従来のコイルアンテナでは、コイルアンテナの特性であるQ値は向上するが、コイルアンテナと相手側アンテナとの間の結合度が低下するという問題があった。   However, the conventional coil antenna described in Patent Document 1 has a problem that the Q factor, which is a characteristic of the coil antenna, is improved, but the degree of coupling between the coil antenna and the counterpart antenna is lowered.

本発明は上記の点に鑑みてなされた発明であり、本発明の目的は、相手側アンテナとの結合度を保ちつつ、Q値を向上させることができるコイルアンテナ、及び、このコイルアンテナを備える電子機器を提供することにある。   The present invention has been made in view of the above points, and an object of the present invention is to provide a coil antenna capable of improving the Q value while maintaining the degree of coupling with the counterpart antenna, and the coil antenna. To provide electronic equipment.

本発明の一態様に係るコイルアンテナは、コイル導体を備える。前記コイル導体は、巻回軸の周りに巻き回され、コイル開口を有する。前記コイル導体は、第1コイル導体部と、第2コイル導体部と、第3コイル導体部とを備える。前記第1コイル導体部は、少なくとも1回巻かれた状態に設けられている。前記第2コイル導体部は、少なくとも1回巻かれた状態であり、前記第1コイル導体部に比べて前記コイル開口から離れて設けられている。前記第3コイル導体部は、少なくとも1回巻かれた状態であり、前記第2コイル導体部に比べて前記コイル開口から離れて設けられている。前記第3コイル導体部の導体線幅は、前記第1コイル導体部の導体線幅よりも太く、かつ、前記第2コイル導体部の導体線幅よりも細い。   A coil antenna according to one embodiment of the present invention includes a coil conductor. The coil conductor is wound around a winding axis and has a coil opening. The coil conductor includes a first coil conductor portion, a second coil conductor portion, and a third coil conductor portion. The first coil conductor portion is provided in a state wound at least once. The second coil conductor portion is wound at least once, and is provided farther from the coil opening than the first coil conductor portion. The third coil conductor portion is wound at least once, and is provided farther from the coil opening than the second coil conductor portion. The conductor line width of the third coil conductor part is larger than the conductor line width of the first coil conductor part and is thinner than the conductor line width of the second coil conductor part.

本発明の一態様に係るコイルアンテナは、コイル導体を備える。前記コイル導体は、巻回軸の周りに巻き回され、コイル開口を有する。前記コイル導体は、第1領域、第2領域、及び第3領域を有する。前記第1領域、前記第2領域、及び前記第3領域は、前記コイル開口の重心と前記コイル導体の最外周とを結ぶ直線上において、前記コイル導体の最内周と前記コイル導体の前記最外周との間の長さを3等分して得られる。前記第1領域は、前記第2領域に比べて前記コイル開口の重心に近接する。前記第2領域は、前記第3領域に比べて前記コイル開口の重心に近接する。前記第3領域内の前記直線上における線間数は、前記第1領域内の前記直線上における線間数よりも少なく、かつ、前記第2領域内の前記直線上における線間数よりも多い。   A coil antenna according to one embodiment of the present invention includes a coil conductor. The coil conductor is wound around a winding axis and has a coil opening. The coil conductor has a first region, a second region, and a third region. The first region, the second region, and the third region are located on a straight line connecting the center of gravity of the coil opening and the outermost periphery of the coil conductor, and the innermost periphery of the coil conductor and the outermost portion of the coil conductor. It is obtained by dividing the length between the outer circumference into three equal parts. The first region is closer to the center of gravity of the coil opening than the second region. The second region is closer to the center of gravity of the coil opening than the third region. The number of lines on the straight line in the third region is smaller than the number of lines on the straight line in the first region, and more than the number of lines on the straight line in the second region. .

本発明の一態様に係る電子機器は、前記コイルアンテナと、制御部とを備える。前記制御部は、前記コイルアンテナが受信又は送信する信号を制御する。   An electronic apparatus according to an aspect of the present invention includes the coil antenna and a control unit. The control unit controls a signal received or transmitted by the coil antenna.

本発明の上記態様に係るコイルアンテナ及び電子機器によれば、相手側アンテナとの結合度を保ちつつ、Q値を向上させることができる。   According to the coil antenna and the electronic apparatus according to the above aspect of the present invention, the Q value can be improved while maintaining the degree of coupling with the counterpart antenna.

図1Aは、本発明の一実施形態に係るアンテナ装置の断面図である。図1Bは、同上のアンテナ装置の要部の断面図である。FIG. 1A is a cross-sectional view of an antenna device according to an embodiment of the present invention. FIG. 1B is a cross-sectional view of a main part of the antenna device. 図2は、同上のアンテナ装置の正面図である。FIG. 2 is a front view of the antenna device. 図3は、同上のアンテナ装置の分解斜視図である。FIG. 3 is an exploded perspective view of the antenna device. 図4は、本発明の一実施形態に係るコイルアンテナにおけるコイル導体の導体線幅を表す図である。FIG. 4 is a diagram illustrating the conductor line width of the coil conductor in the coil antenna according to the embodiment of the present invention. 図5は、同上のアンテナ装置及び相手側アンテナの使用時の断面図である。FIG. 5 is a cross-sectional view of the antenna device and the counterpart antenna when used. 図6は、同上のコイルアンテナにおける磁束の向きを示す説明図である。FIG. 6 is an explanatory diagram showing the direction of magnetic flux in the coil antenna. 図7は、同上のアンテナ装置の要部の断面図である。FIG. 7 is a cross-sectional view of a main part of the antenna device. 図8は、本発明の一実施形態に係る電子機器の概略図である。FIG. 8 is a schematic diagram of an electronic apparatus according to an embodiment of the present invention. 図9Aは、本発明の一実施形態の第1変形例に係るコイルアンテナにおけるコイル導体の導体線幅を表す図である。図9Bは、本発明の一実施形態の第2変形例に係るコイルアンテナにおけるコイル導体の導体線幅を表す図である。図9Cは、本発明の一実施形態の第3変形例に係るコイルアンテナにおけるコイル導体の導体線幅を表す図である。図9Dは、本発明の一実施形態の第4変形例に係るコイルアンテナにおけるコイル導体の導体線幅を表す図である。FIG. 9A is a diagram illustrating a conductor line width of a coil conductor in a coil antenna according to a first modification of the embodiment of the present invention. FIG. 9B is a diagram illustrating the conductor line width of the coil conductor in the coil antenna according to the second modification of the embodiment of the present invention. FIG. 9C is a diagram illustrating a conductor line width of a coil conductor in a coil antenna according to a third modification of the embodiment of the present invention. FIG. 9D is a diagram illustrating a conductor line width of a coil conductor in a coil antenna according to a fourth modification of an embodiment of the present invention. 図10は、本発明の一実施形態の第5変形例に係るアンテナ装置の断面図である。FIG. 10 is a cross-sectional view of an antenna device according to a fifth modification of the embodiment of the present invention.

以下、実施形態に係るコイルアンテナ、アンテナ装置、及び電子機器について、図面を参照して説明する。なお、明細書及び図面に記載された構成要素について、明細書及び図面に記載された大きさ及び厚さ、並びにそれらの寸法関係は例示であり、これらの構成要素は、明細書及び図面に記載された例示には限定されない。   Hereinafter, a coil antenna, an antenna device, and an electronic device according to embodiments will be described with reference to the drawings. In addition, about the component described in a specification and drawing, the magnitude | size and thickness which were described in the specification and drawing, and those dimensional relationships are illustrations, These components are described in a specification and drawing. It is not limited to the exemplified examples.

(実施形態)
(1)アンテナ装置の全体構成
本実施形態に係るアンテナ装置1は、図1A、図1B、図2、及び図3に示すように、コイルアンテナ2と、平面導体3とを備える。アンテナ装置1では、コイルアンテナ2が、コイル開口60を有するコイル導体6を含む。平面導体3は、コイルアンテナ2と対向するように配置されている。
(Embodiment)
(1) Overall Configuration of Antenna Device As shown in FIGS. 1A, 1B, 2 and 3, the antenna device 1 according to this embodiment includes a coil antenna 2 and a planar conductor 3. In the antenna device 1, the coil antenna 2 includes a coil conductor 6 having a coil opening 60. The planar conductor 3 is disposed so as to face the coil antenna 2.

コイル導体6は、第1コイル導体部材61と、第2コイル導体部材62と、複数のスルーホール63とを含む。第1コイル導体部材61は、第1方向D1に沿った第1軸(巻回軸)の周りにスパイラル状に設けられている。第2コイル導体部材62は、第1方向D1に沿った第2軸(巻回軸)の周りにスパイラル状に設けられている。   The coil conductor 6 includes a first coil conductor member 61, a second coil conductor member 62, and a plurality of through holes 63. The first coil conductor member 61 is provided in a spiral shape around a first axis (winding axis) along the first direction D1. The second coil conductor member 62 is provided in a spiral shape around the second axis (winding axis) along the first direction D1.

上記のようなアンテナ装置1において、第1コイル導体部材61は、第1コイル導体部64aと、第2コイル導体部65aと、第3コイル導体部66aとを含む。第2コイル導体部材62は、第1コイル導体部64bと、第2コイル導体部65bと、第3コイル導体部66bとを含む。   In the antenna device 1 as described above, the first coil conductor member 61 includes a first coil conductor part 64a, a second coil conductor part 65a, and a third coil conductor part 66a. The second coil conductor member 62 includes a first coil conductor portion 64b, a second coil conductor portion 65b, and a third coil conductor portion 66b.

第1コイル導体部材61において、第3コイル導体部66aの導体線幅W13は、第1コイル導体部64aの導体線幅W11よりも太く、かつ、第2コイル導体部65aの導体線幅W12よりも細い。同様に、第2コイル導体部材62において、第3コイル導体部66bの導体線幅W23は、第1コイル導体部64bの導体線幅W21よりも太く、かつ、第2コイル導体部65bの導体線幅W22よりも太い。   In the first coil conductor member 61, the conductor line width W13 of the third coil conductor part 66a is larger than the conductor line width W11 of the first coil conductor part 64a, and more than the conductor line width W12 of the second coil conductor part 65a. Is also thin. Similarly, in the second coil conductor member 62, the conductor wire width W23 of the third coil conductor portion 66b is larger than the conductor wire width W21 of the first coil conductor portion 64b, and the conductor wire of the second coil conductor portion 65b. Thicker than width W22.

上記のようなアンテナ装置1は、図8に示すように、電子機器8に搭載されており、例えば、磁界結合を利用した電子機器8に対するワイヤレス給電(ワイヤレス充電を含む)に用いられる。アンテナ装置1が用いられるワイヤレス給電方式としては、例えば電磁誘導方式又は磁界共鳴方式がある。電磁誘導方式のワイヤレス給電の規格としては、例えばWPC(Wireless Power Consortium)の策定するQi(登録商標)がある。磁界共鳴方式のワイヤレス給電の規格としては、例えばA4WP(Alliance for Wireless Power)がある。   The antenna device 1 as described above is mounted on an electronic device 8 as shown in FIG. 8, and is used for, for example, wireless power feeding (including wireless charging) to the electronic device 8 using magnetic field coupling. As a wireless power feeding method in which the antenna device 1 is used, for example, there is an electromagnetic induction method or a magnetic field resonance method. As an electromagnetic induction type wireless power supply standard, for example, there is Qi (registered trademark) established by WPC (Wireless Power Consortium). For example, A4WP (Alliance for Wireless Power) is a standard for magnetic resonance wireless power feeding.

アンテナ装置1を備える電子機器8は、例えば、スマートフォンを含む携帯電話、ウェアラブル機器、腕時計型端末、ヘッドフォン又は補聴器である。電子機器8は、アンテナ装置1を備えると共に、制御部81を備える。制御部81は、コイルアンテナ2が受信又は送信する信号を制御する。   The electronic device 8 including the antenna device 1 is, for example, a mobile phone including a smartphone, a wearable device, a wristwatch type terminal, headphones, or a hearing aid. The electronic device 8 includes the antenna device 1 and a control unit 81. The control unit 81 controls a signal received or transmitted by the coil antenna 2.

(2)アンテナ装置の各構成要素
次に、本実施形態に係るアンテナ装置1の各構成要素について、図面を参照して説明する。
(2) Each component of antenna apparatus Next, each component of the antenna apparatus 1 which concerns on this embodiment is demonstrated with reference to drawings.

(2.1)平面導体
平面導体3は、図1A及び図3に示すように、金属などにより例えば四角形状に形成されている。平面導体3は、例えば、アルミニウム、ステンレス又は銅などの単一の材料により形成されている。平面導体3は、例えば、電子機器8(図8参照)内に搭載されている二次電池の金属ケースである。平面導体3は、第1主面31と、第2主面32とを有し、第1方向D1において第1主面31がコイルアンテナ2と対向するように配置されている。第1主面31及び第2主面32は四角形状の平面であり、平面導体3における厚み方向(第1方向D1)の両端に位置する。また、第1主面31及び第2主面32は互いに対面し、第1主面31の法線方向及び第2主面32の法線方向は第1方向D1と一致するか、実質的に一致する。
(2.1) Planar Conductor As shown in FIGS. 1A and 3, the planar conductor 3 is formed of a metal or the like, for example, in a square shape. The planar conductor 3 is made of, for example, a single material such as aluminum, stainless steel, or copper. The planar conductor 3 is, for example, a metal case of a secondary battery mounted in the electronic device 8 (see FIG. 8). The planar conductor 3 has a first main surface 31 and a second main surface 32, and is arranged so that the first main surface 31 faces the coil antenna 2 in the first direction D1. The first main surface 31 and the second main surface 32 are rectangular planes and are located at both ends of the planar conductor 3 in the thickness direction (first direction D1). The first main surface 31 and the second main surface 32 face each other, and the normal direction of the first main surface 31 and the normal direction of the second main surface 32 coincide with the first direction D1 or substantially. Match.

平面導体3では、第1方向D1の寸法に対する第2方向D2の寸法(第1方向D1と直交する方向、又は、平面導体3の第1主面31若しくは第2主面32に沿った方向)の寸法比が1よりも大きい。つまり、平面導体3は、第1方向D1の寸法よりも第2方向D2の寸法のほうが長い平面導体である。   In the planar conductor 3, the dimension in the second direction D2 with respect to the dimension in the first direction D1 (the direction orthogonal to the first direction D1 or the direction along the first major surface 31 or the second major surface 32 of the planar conductor 3). The dimensional ratio is greater than 1. That is, the planar conductor 3 is a planar conductor whose dimension in the second direction D2 is longer than the dimension in the first direction D1.

なお、平面導体3において、コイルアンテナ2と対向する第1主面31が完全な平面であることには限定されない。ここでは、平面導体3の第1方向D1における寸法(平面導体3の厚み)又は第2方向D2における寸法に比べて小さい凹凸があっても、平面といえる。また、第1主面31の全てが平面であることにも限定されない。すなわち、第1主面31は、少なくとも一部において、平面であってもよい。なお、平面導体3に代えて、曲面を有する面状導体を用いてもよい。   In the planar conductor 3, the first main surface 31 facing the coil antenna 2 is not limited to being a complete plane. Here, even if there are unevenness smaller than the dimension in the first direction D1 of the planar conductor 3 (the thickness of the planar conductor 3) or the dimension in the second direction D2, it can be said to be a plane. Moreover, it is not limited that all the 1st main surfaces 31 are planes. That is, the first main surface 31 may be a flat surface at least partially. Instead of the planar conductor 3, a planar conductor having a curved surface may be used.

(2.2)コイルアンテナ
コイルアンテナ2は、図1A、図1B、及び図2に示すように、四角形状に形成されており、基材5と、コイル導体6と、磁性体7とを備える。また、コイルアンテナ2は、2つの接続端子21と、第1保護層41と、第2保護層42とを更に備える。コイルアンテナ2は、第1方向D1において平面導体3に隣接(近接)している。なお、コイルアンテナ2は、平面導体3と密着してもよいし、平面導体3に対して隙間を介して配置されていてもよい。
(2.2) Coil Antenna As shown in FIGS. 1A, 1B, and 2, the coil antenna 2 is formed in a quadrangular shape, and includes a base material 5, a coil conductor 6, and a magnetic body 7. . The coil antenna 2 further includes two connection terminals 21, a first protective layer 41, and a second protective layer 42. The coil antenna 2 is adjacent (close) to the planar conductor 3 in the first direction D1. The coil antenna 2 may be in close contact with the planar conductor 3 or may be disposed with a gap with respect to the planar conductor 3.

(2.2.1)基材
基材5は、樹脂などの電気絶縁材料により板状又はシート状に形成されており、第1主面51及び第2主面52を有する。基材5に用いられる電気絶縁材料としては、例えば、ポリイミド、PET(Poly Ethylene Terephthalate:ポリエチレンテレフタレート)又は液晶ポリマー(Liquid Crystal Polymer:LCP)がある。基材5は、第1方向D1からの平面視で四角形状である。基材5の大きさは、コイル導体6が設けられるのに十分な大きさである。
(2.2.1) Base Material The base material 5 is formed in a plate shape or a sheet shape from an electrically insulating material such as a resin, and has a first main surface 51 and a second main surface 52. Examples of the electrical insulating material used for the substrate 5 include polyimide, PET (Poly Ethylene Terephthalate) or liquid crystal polymer (LCP). The base material 5 has a quadrangular shape in a plan view from the first direction D1. The size of the base material 5 is sufficient to provide the coil conductor 6.

(2.2.2)コイル導体
コイル導体6は、上述したように、第1方向D1からの平面視で円環状であり、コイル開口60を有する。また、コイル導体6は、上述したように、第1コイル導体部材61と、第2コイル導体部材62と、複数のスルーホール63とを備える。コイルアンテナ2の抵抗成分を低減するために、第1コイル導体部材61と第2コイル導体部材62とが電気的に並列に接続されており、第1コイル導体部材61と第2コイル導体部材62とを複数のスルーホール63が電気的に接続している。本実施形態において、コイル開口60の中心と重心は一致している。
(2.2.2) Coil conductor As described above, the coil conductor 6 has an annular shape in plan view from the first direction D1 and has a coil opening 60. In addition, as described above, the coil conductor 6 includes the first coil conductor member 61, the second coil conductor member 62, and a plurality of through holes 63. In order to reduce the resistance component of the coil antenna 2, the first coil conductor member 61 and the second coil conductor member 62 are electrically connected in parallel, and the first coil conductor member 61 and the second coil conductor member 62 are connected. A plurality of through holes 63 are electrically connected to each other. In the present embodiment, the center of the coil opening 60 and the center of gravity coincide.

第1コイル導体部材61は、図2及び図3に示すように、第1方向D1に沿った第1軸の周りにスパイラル状に設けられている。第1コイル導体部材61は、例えば12回巻かれた状態に設けられている。第1コイル導体部材61は、銅又はアルミニウムなどにより、基材5の第1主面51に設けられている。例えば、エッチング又は印刷により、銅膜又はアルミニウム膜が基材5の第1主面51上に形成されることによって、第1コイル導体部材61が基材5の第1主面51に設けられる。   As shown in FIGS. 2 and 3, the first coil conductor member 61 is provided in a spiral shape around the first axis along the first direction D1. The first coil conductor member 61 is provided in a state wound, for example, 12 times. The first coil conductor member 61 is provided on the first main surface 51 of the base material 5 with copper, aluminum, or the like. For example, the first coil conductor member 61 is provided on the first main surface 51 of the base material 5 by forming a copper film or an aluminum film on the first main surface 51 of the base material 5 by etching or printing.

第2コイル導体部材62は、第1コイル導体部材61と同様、図3に示すように、第1方向D1に沿った第2軸の周りにスパイラル状に設けられている。第2コイル導体部材62は、例えば12回巻かれた状態に設けられている。第2コイル導体部材62は、第1方向D1において第1コイル導体部材61に比べて平面導体3の近くに位置する。第2コイル導体部材62は、銅又はアルミニウムなどにより、基材5の第2主面52(図1A参照)に設けられている。例えば、エッチング又は印刷により、銅膜又はアルミニウム膜が基材5の第2主面52上に形成されることによって、第2コイル導体部材62が基材5の第2主面52に設けられる。なお、本実施形態においては、平面導体3の第1主面31、平面導体3の第2主面32、基材5の第1主面51、及び基材5の第2主面52は互いに平行である。また、基材5の第1主面51及び基材5の第2主面52は互いに対面し、基材5の第1主面51の法線方向及び基材5の第2主面52の法線方向は第1方向D1と一致するか、実質的に一致する。   Similar to the first coil conductor member 61, the second coil conductor member 62 is provided in a spiral shape around the second axis along the first direction D1, as shown in FIG. The second coil conductor member 62 is provided, for example, in a state wound 12 times. The second coil conductor member 62 is located closer to the planar conductor 3 than the first coil conductor member 61 in the first direction D1. The 2nd coil conductor member 62 is provided in the 2nd main surface 52 (refer to Drawing 1A) of substrate 5 with copper or aluminum. For example, the second coil conductor member 62 is provided on the second main surface 52 of the base material 5 by forming a copper film or an aluminum film on the second main surface 52 of the base material 5 by etching or printing. In the present embodiment, the first main surface 31 of the flat conductor 3, the second main surface 32 of the flat conductor 3, the first main surface 51 of the base material 5, and the second main surface 52 of the base material 5 are mutually connected. Parallel. Further, the first main surface 51 of the base material 5 and the second main surface 52 of the base material 5 face each other, the normal direction of the first main surface 51 of the base material 5 and the second main surface 52 of the base material 5. The normal direction coincides with or substantially coincides with the first direction D1.

ここで、「N(Nは自然数)回巻かれた状態に設けられている」とは、線状の導線がN回巻かれている場合だけではなく、線状の導体がN回巻かれた形状にパターン形成されている場合も含む。   Here, “provided in a state where N (N is a natural number) is wound” means that the linear conductor is wound N times, not only when the linear conductor is wound N times. This includes cases where the pattern is formed in a shape.

また、スパイラル状に設けられているコイル導体部材(第1コイル導体部材61、第2コイル導体部材62)は、一の平面上において巻回軸の周りに渦巻き状に複数回巻かれているような形状の2次元のコイル導体であってもよいし、あるいは、巻回軸の周りに巻回軸に沿ってらせん状に複数回巻かれているような形状の3次元のコイル導体であってもよい。図1A、図2、及び図3は、2次元のコイル導体を示す。   In addition, the coil conductor members (the first coil conductor member 61 and the second coil conductor member 62) provided in a spiral shape seem to be wound a plurality of times around the winding axis in a spiral shape on one plane. It may be a two-dimensional coil conductor having an arbitrary shape, or a three-dimensional coil conductor having a shape that is wound a plurality of times in a spiral shape around the winding axis. Also good. 1A, 2 and 3 show a two-dimensional coil conductor.

第1コイル導体部材61は、図1A、図1B及び図3に示すように、第1方向D1において、第2コイル導体部材62よりも磁性体7から遠い位置(図1Aでは上側の位置)に設けられている。一方、第2コイル導体部材62は、第1方向D1において、第1コイル導体部材61よりも磁性体7に近い位置(図1Aでは下側の位置)に設けられている。つまり、第2コイル導体部材62は、第1コイル導体部材61に比べて、磁性体7に近接する。   As shown in FIGS. 1A, 1B, and 3, the first coil conductor member 61 is located farther from the magnetic body 7 than the second coil conductor member 62 in the first direction D1 (upper position in FIG. 1A). Is provided. On the other hand, the second coil conductor member 62 is provided at a position closer to the magnetic body 7 than the first coil conductor member 61 (a lower position in FIG. 1A) in the first direction D1. That is, the second coil conductor member 62 is closer to the magnetic body 7 than the first coil conductor member 61.

第2コイル導体部材62は、第1方向D1からの平面視で、第1コイル導体部材61と重なる位置にある。そして、第2コイル導体部材62は、第1方向D1からの平面視で、第1コイル導体部材61に沿って形成されている。言い換えると、第2コイル導体部材62は、第1コイル導体部材61と直交して形成されているのではなく、第2コイル導体部材62の周方向が第1コイル導体部材61の周方向と略平行になるように形成されている。   The second coil conductor member 62 is in a position overlapping the first coil conductor member 61 in plan view from the first direction D1. The second coil conductor member 62 is formed along the first coil conductor member 61 in a plan view from the first direction D1. In other words, the second coil conductor member 62 is not formed orthogonal to the first coil conductor member 61, but the circumferential direction of the second coil conductor member 62 is substantially the same as the circumferential direction of the first coil conductor member 61. It is formed to be parallel.

上記のように、第2コイル導体部材62が第1コイル導体部材61と重なっていることにより、第1コイル導体部材61及び第2コイル導体部材62で囲まれているコイル開口60を大きくしつつ、コイルアンテナ2が大きくなることを抑制することができる。   As described above, since the second coil conductor member 62 overlaps the first coil conductor member 61, the coil opening 60 surrounded by the first coil conductor member 61 and the second coil conductor member 62 is enlarged. It can suppress that the coil antenna 2 becomes large.

複数のスルーホール63は、図1A、図1B、図2、及び図3に示すように、第1方向D1からの平面視で互いに異なる位置に設けられており、第1コイル導体部材61と第2コイル導体部材62とを電気的に接続させる。複数のスルーホール63は、基材5の内部において互いに異なる位置に設けられている。   As shown in FIGS. 1A, 1B, 2 and 3, the plurality of through holes 63 are provided at different positions in plan view from the first direction D1, and the first coil conductor member 61 and the first The two-coil conductor member 62 is electrically connected. The plurality of through holes 63 are provided at different positions inside the base material 5.

図示例では、第1コイル導体部材61の幅方向において、第2コイル導体部材62の中心が第1コイル導体部材61の中心と一致するように、第2コイル導体部材62は形成されている。ただし、第2コイル導体部材62の中心は、第1コイル導体部材61の中心と一致することには限定されない。   In the illustrated example, the second coil conductor member 62 is formed so that the center of the second coil conductor member 62 coincides with the center of the first coil conductor member 61 in the width direction of the first coil conductor member 61. However, the center of the second coil conductor member 62 is not limited to coincide with the center of the first coil conductor member 61.

また、上述したように、第1コイル導体部材61と第2コイル導体部材62とは、複数のスルーホール63により、電気的に接続されている。これにより、スルーホール63を介して電流が第1方向D1(第1コイル導体部材61から第2コイル導体部材62に向かう方向、又は、第2コイル導体部材62から第1コイル導体部材61に向かう方向)に流れることができる。その結果、第1コイル導体部材61のみ、あるいは、第2コイル導体部材62のみでコイル導体6が構成されている場合に比べて、抵抗成分を小さくすることができる。   Further, as described above, the first coil conductor member 61 and the second coil conductor member 62 are electrically connected by the plurality of through holes 63. Accordingly, the current flows through the through hole 63 in the first direction D1 (the direction from the first coil conductor member 61 toward the second coil conductor member 62, or the second coil conductor member 62 toward the first coil conductor member 61). Direction). As a result, the resistance component can be reduced as compared with the case where the coil conductor 6 is configured by only the first coil conductor member 61 or only the second coil conductor member 62.

(2.2.3)コイル導体の導体線幅
コイル導体6の第1コイル導体部材61及び第2コイル導体部材62は、図1A、図1B、図2、及び図3に示すように、細長い線状の導体である。より詳細には、第1コイル導体部材61は、第1軸方向(第1方向D1)からの平面視で第1軸の周りに巻かれた形状に設けられている。第2コイル導体部材62は、第2軸方向(第1方向D1)からの平面視で第2軸の周りに巻かれた形状に設けられている。
(2.2.3) Conductor Line Width of Coil Conductor The first coil conductor member 61 and the second coil conductor member 62 of the coil conductor 6 are elongated as shown in FIGS. 1A, 1B, 2, and 3. It is a linear conductor. More specifically, the first coil conductor member 61 is provided in a shape wound around the first axis in a plan view from the first axial direction (first direction D1). The second coil conductor member 62 is provided in a shape wound around the second axis in plan view from the second axis direction (first direction D1).

このような第1コイル導体部材61では、コイル導体6の最内周とコイル導体6の最外周との間において、導体線幅は、全ての位置で同じではない。第2コイル導体部材62でも、第1コイル導体部材61と同様、コイル導体6の最内周とコイル導体6の最外周との間において、導体線幅は、全ての位置で同じではない。以下、第1コイル導体部材61及び第2コイル導体部材62の導体線幅について、詳細を説明する。   In such a first coil conductor member 61, the conductor line width is not the same at all positions between the innermost periphery of the coil conductor 6 and the outermost periphery of the coil conductor 6. Also in the second coil conductor member 62, the conductor line width is not the same at all positions between the innermost periphery of the coil conductor 6 and the outermost periphery of the coil conductor 6, as in the first coil conductor member 61. Hereinafter, the conductor line widths of the first coil conductor member 61 and the second coil conductor member 62 will be described in detail.

まず、第1コイル導体部材61について説明する。第1コイル導体部材61は、図1A、図1B、図2、及び図3に示すように、第1コイル導体部64aと、第2コイル導体部65aと、第3コイル導体部66aとを備える。第1コイル導体部64aは、少なくとも1回(図示例では4回)巻かれた状態に設けられている。第2コイル導体部65aは、少なくとも1回(図示例では4回)巻かれた状態であり、第1コイル導体部64aに比べてコイル開口60から離れて設けられている。第3コイル導体部66aは、少なくとも1回(図示例では4回)巻かれた状態であり、第2コイル導体部65aに比べてコイル開口60から離れて設けられている。   First, the first coil conductor member 61 will be described. As shown in FIGS. 1A, 1B, 2, and 3, the first coil conductor member 61 includes a first coil conductor portion 64a, a second coil conductor portion 65a, and a third coil conductor portion 66a. . The first coil conductor portion 64a is provided in a state of being wound at least once (four times in the illustrated example). The second coil conductor portion 65a is wound at least once (four times in the illustrated example) and is provided farther from the coil opening 60 than the first coil conductor portion 64a. The third coil conductor portion 66a is wound at least once (four times in the illustrated example), and is provided farther from the coil opening 60 than the second coil conductor portion 65a.

第1コイル導体部材61において、第3コイル導体部66aの導体線幅W13は、第1コイル導体部64aの導体線幅W11よりも太く、かつ、第2コイル導体部65aの導体線幅W12よりも細い。つまり、第1コイル導体部材61において、内周部の導体線幅及び外周部の導体線幅に対して、中間部の導体線幅が太い。   In the first coil conductor member 61, the conductor line width W13 of the third coil conductor part 66a is larger than the conductor line width W11 of the first coil conductor part 64a, and more than the conductor line width W12 of the second coil conductor part 65a. Is also thin. That is, in the first coil conductor member 61, the conductor line width in the intermediate part is larger than the conductor line width in the inner periphery part and the conductor line width in the outer periphery part.

ここで、第1コイル導体部64aの導体線幅W11とは、第1コイル導体部64aを構成する線状の導体のうち、第1コイル導体部材61の第1軸に直交しコイル開口60の重心を通る直線L11上に位置する部分の幅をいう。例えば、第1コイル導体部64aの導体線幅W11は、第1コイル導体部64aを構成する線状の導体の第2方向D2における長さである。ここで、第1コイル導体部材61の第1軸に直交しコイル開口60の重心を通る直線L11は、言い換えれば、コイル開口60の重心とコイル導体6の最外周とを結ぶ直線ともいうことができる。また、第1軸の方向において、コイル開口60の重心と第1コイル導体部材61とが異なる位置にある場合、直線L11は、第1軸の方向からの平面視で、第1軸に直交し、コイル開口60の重心とコイル導体6の最外周を結ぶ直線とする。   Here, the conductor wire width W11 of the first coil conductor part 64a is orthogonal to the first axis of the first coil conductor member 61 among the linear conductors constituting the first coil conductor part 64a. The width of the part located on the straight line L11 passing through the center of gravity. For example, the conductor line width W11 of the first coil conductor portion 64a is the length in the second direction D2 of the linear conductor that forms the first coil conductor portion 64a. Here, the straight line L11 that is orthogonal to the first axis of the first coil conductor member 61 and passes through the center of gravity of the coil opening 60 may also be referred to as a straight line that connects the center of gravity of the coil opening 60 and the outermost periphery of the coil conductor 6. it can. When the center of gravity of the coil opening 60 and the first coil conductor member 61 are in different positions in the direction of the first axis, the straight line L11 is orthogonal to the first axis in plan view from the direction of the first axis. The straight line connecting the center of gravity of the coil opening 60 and the outermost periphery of the coil conductor 6.

なお、本実施形態では、上記の規定を満たす全て(任意)の直線L11上において、第1コイル導体部64aの導体線幅W11、第2コイル導体部65aの導体線幅W12、及び第3コイル導体部66aの導体線幅W13が上記の条件を満たしている。ただし、全ての直線L11上において、導体線幅W11,W12,W13が上記の条件を満たしていることには限定されず、特定の1本の直線L11上において、導体線幅W11,W12,W13が上記の条件を満たしていてもよい。   In the present embodiment, the conductor line width W11 of the first coil conductor part 64a, the conductor line width W12 of the second coil conductor part 65a, and the third coil on all (arbitrary) straight lines L11 that satisfy the above-mentioned definition. The conductor line width W13 of the conductor portion 66a satisfies the above conditions. However, the conductor line widths W11, W12, and W13 are not limited to satisfy the above conditions on all the straight lines L11. The conductor line widths W11, W12, and W13 are not limited to the specific straight line L11. May satisfy the above conditions.

第1コイル導体部64aが第1軸の周りに円状に巻かれているような形状である場合、第1コイル導体部64aの導体線幅W11は、第1コイル導体部64aを構成する線状の導体において長手方向(円周方向)に直交する短手方向の長さをいう。この場合、第1コイル導体部64aを構成する線状の導体の長手方向が円周方向に沿っているから、上記導体の短手方向が半径方向となる。   When the first coil conductor portion 64a is shaped like a circle wound around the first axis, the conductor wire width W11 of the first coil conductor portion 64a is a line that constitutes the first coil conductor portion 64a. This is the length in the short direction perpendicular to the longitudinal direction (circumferential direction). In this case, since the longitudinal direction of the linear conductor constituting the first coil conductor portion 64a is along the circumferential direction, the short direction of the conductor is the radial direction.

また、第1コイル導体部64aが複数回巻かれているような形状である場合、第1コイル導体部64aの導体線幅W11とは、第1コイル導体部64aを構成する線状の導体のうち、第1コイル導体部材61の第1軸に直交しコイル開口60の重心を通る直線L11上に位置する複数の部分の幅の平均値をいう。例えば、図1Aに示すように第1コイル導体部64aが4回巻かれているような形状である場合、つまり、第2方向D2において4か所の導体部分がある場合、第1コイル導体部64aの導体線幅W11は、上記4か所の導体部分の第2方向D2における長さの平均値である。   In addition, when the first coil conductor portion 64a has a shape that is wound a plurality of times, the conductor line width W11 of the first coil conductor portion 64a is the linear conductor that constitutes the first coil conductor portion 64a. Among these, the average value of the widths of a plurality of portions located on a straight line L11 that is orthogonal to the first axis of the first coil conductor member 61 and passes through the center of gravity of the coil opening 60 is referred to. For example, as shown in FIG. 1A, when the first coil conductor portion 64a is shaped to be wound four times, that is, when there are four conductor portions in the second direction D2, the first coil conductor portion The conductor line width W11 of 64a is an average value of the lengths in the second direction D2 of the four conductor portions.

第2コイル導体部65aについても、第1コイル導体部64aと同様、第2コイル導体部65aの導体線幅W12とは、第2コイル導体部65aを構成する線状の導体のうち、第1コイル導体部材61の第1軸に直交しコイル開口60の重心を通る直線L11上に位置する部分の幅をいう。例えば、第2コイル導体部65aの導体線幅W12は、第2コイル導体部65aを構成する線状の導体の第2方向D2における長さである。   Similarly to the first coil conductor portion 64a, the second coil conductor portion 65a also has the conductor line width W12 of the second coil conductor portion 65a, which is the first of the linear conductors constituting the second coil conductor portion 65a. The width of the part located on the straight line L11 orthogonal to the 1st axis | shaft of the coil conductor member 61 and passing through the gravity center of the coil opening 60 is said. For example, the conductor line width W12 of the second coil conductor portion 65a is the length in the second direction D2 of the linear conductor constituting the second coil conductor portion 65a.

第2コイル導体部65aが第1軸の周りに円状に巻かれているような形状である場合、第2コイル導体部65aの導体線幅W12は、第2コイル導体部65aを構成する線状の導体において長手方向(円周方向)に直交する短手方向の長さをいう。この場合、第2コイル導体部65aを構成する線状の導体の長手方向が円周方向に沿っているから、上記導体の短手方向が半径方向となる。   When the second coil conductor portion 65a is shaped like a circle wound around the first axis, the conductor wire width W12 of the second coil conductor portion 65a is a line constituting the second coil conductor portion 65a. This is the length in the short direction perpendicular to the longitudinal direction (circumferential direction). In this case, since the longitudinal direction of the linear conductor constituting the second coil conductor portion 65a is along the circumferential direction, the short direction of the conductor is the radial direction.

また、第2コイル導体部65aが複数回巻かれているような形状である場合、第2コイル導体部65aの導体線幅W12とは、第2コイル導体部65aを構成する線状の導体のうち、第1コイル導体部材61の第1軸に直交しコイル開口60の重心を通る直線L11上に位置する複数の部分の幅の平均値をいう。例えば、第2コイル導体部65aが4回巻かれているような形状である場合、つまり、第2方向D2において4か所の導体部分がある場合、第2コイル導体部65aの導体線幅W12は、上記4か所の導体部分の第2方向D2における長さの平均値である。   Further, when the second coil conductor portion 65a has a shape such that it is wound a plurality of times, the conductor line width W12 of the second coil conductor portion 65a is the linear conductor constituting the second coil conductor portion 65a. Among these, the average value of the widths of a plurality of portions located on a straight line L11 that is orthogonal to the first axis of the first coil conductor member 61 and passes through the center of gravity of the coil opening 60 is referred to. For example, when the shape is such that the second coil conductor portion 65a is wound four times, that is, when there are four conductor portions in the second direction D2, the conductor line width W12 of the second coil conductor portion 65a. Is an average value of the lengths of the four conductor portions in the second direction D2.

第3コイル導体部66aについても、第1コイル導体部64a及び第2コイル導体部65aと同様、第3コイル導体部66aの導体線幅W13とは、第3コイル導体部66aを構成する線状の導体のうち、第1コイル導体部材61の第1軸に直交しコイル開口60の重心を通る直線L11上に位置する部分の幅をいう。例えば、第3コイル導体部66aの導体線幅W13は、第3コイル導体部66aを構成する線状の導体の第2方向D2における長さである。   Similarly to the first coil conductor portion 64a and the second coil conductor portion 65a, the third coil conductor portion 66a also has a conductor line width W13 of the third coil conductor portion 66a that is a linear shape constituting the third coil conductor portion 66a. Among the conductors, the width of a portion located on a straight line L11 that is orthogonal to the first axis of the first coil conductor member 61 and passes through the center of gravity of the coil opening 60 is referred to. For example, the conductor line width W13 of the third coil conductor portion 66a is the length in the second direction D2 of the linear conductor constituting the third coil conductor portion 66a.

第3コイル導体部66aが第1軸の周りに円状に巻かれているような形状である場合、第3コイル導体部66aの導体線幅W13は、第3コイル導体部66aを構成する線状の導体において長手方向(円周方向)に直交する短手方向の長さをいう。この場合、第3コイル導体部66aを構成する線状の導体の長手方向が円周方向に沿っているから、上記導体の短手方向が半径方向となる。   When the third coil conductor portion 66a is shaped like a circle wound around the first axis, the conductor line width W13 of the third coil conductor portion 66a is a line constituting the third coil conductor portion 66a. This is the length in the short direction perpendicular to the longitudinal direction (circumferential direction). In this case, since the longitudinal direction of the linear conductor constituting the third coil conductor portion 66a is along the circumferential direction, the short direction of the conductor is the radial direction.

また、第3コイル導体部66aが複数回巻かれているような形状である場合、第3コイル導体部66aの導体線幅W13とは、第3コイル導体部66aを構成する線状の導体のうち、第1コイル導体部材61の第1軸に直交しコイル開口60の重心を通る直線L11上に位置する複数の部分の幅の平均値をいう。例えば、第3コイル導体部66aが4回巻かれているような形状である場合、つまり、第2方向D2において4か所の導体部分がある場合、第3コイル導体部66aの導体線幅W13は、上記4か所の導体部分の第2方向D2における長さの平均値である。   In addition, when the third coil conductor portion 66a is shaped to be wound a plurality of times, the conductor line width W13 of the third coil conductor portion 66a is the linear conductor constituting the third coil conductor portion 66a. Among these, the average value of the widths of a plurality of portions located on a straight line L11 that is orthogonal to the first axis of the first coil conductor member 61 and passes through the center of gravity of the coil opening 60 is referred to. For example, when the shape is such that the third coil conductor portion 66a is wound four times, that is, when there are four conductor portions in the second direction D2, the conductor line width W13 of the third coil conductor portion 66a. Is an average value of the lengths of the four conductor portions in the second direction D2.

図1Aに示す例の場合、第1コイル導体部材61は、12回巻かれた状態に設けられている。第1コイル導体部材61における1ターン目から12ターン目までの導体線幅w1〜w12の関係は、図4に示すとおりである。図4の横軸は、第1コイル導体部材61を構成する線状の導体部分における各部分の位置を、ターン番号として表わしている。例えば、図4の横軸の「1」は、1ターン目の導体部分を表し、横軸の「12」は、12ターン目の導体部分を表す。コイル導体6の最内周側から順に、1ターン目、2ターン目と規定し、コイル導体6の最外周が12ターン目となる。   In the case of the example shown in FIG. 1A, the first coil conductor member 61 is provided in a state of being wound 12 times. The relationship of the conductor line widths w1 to w12 from the first turn to the twelfth turn in the first coil conductor member 61 is as shown in FIG. The horizontal axis of FIG. 4 represents the position of each part in the linear conductor part which comprises the 1st coil conductor member 61 as a turn number. For example, “1” on the horizontal axis in FIG. 4 represents the conductor portion of the first turn, and “12” on the horizontal axis represents the conductor portion of the twelfth turn. The first turn and the second turn are defined in order from the innermost circumference side of the coil conductor 6, and the outermost circumference of the coil conductor 6 is the 12th turn.

図4に示す例では、第1コイル導体部64aでは、1ターン目から4ターン目までの導体線幅w1〜w4は0.5mmである。したがって、第1コイル導体部64aの導体線幅W11は0.5mmである。第2コイル導体部65aでは、5ターン目及び8ターン目の導体線幅w5,w8は1.6mmであり、6ターン目及び7ターン目の導体線幅w6,w7は1.7mmである。第2コイル導体部65aの導体線幅W12は、5ターン目から8ターン目までの導体線幅w5〜w8の平均値であるから、1.65mmである。第3コイル導体部66aでは、9ターン目の導体線幅w9は1.0mmであり、10ターン目の導体線幅w10は0.9mmであり、11ターン目の導体線幅w11は0.8mmであり、12ターン目の導体線幅w12は0.7mmである。第3コイル導体部66aの導体線幅W13は、9ターン目から12ターン目までの導体線幅w9〜w12の平均値であるから、0.85mmである。   In the example shown in FIG. 4, in the first coil conductor portion 64a, the conductor line widths w1 to w4 from the first turn to the fourth turn are 0.5 mm. Therefore, the conductor line width W11 of the first coil conductor portion 64a is 0.5 mm. In the second coil conductor portion 65a, the conductor line widths w5 and w8 for the fifth and eighth turns are 1.6 mm, and the conductor line widths w6 and w7 for the sixth and seventh turns are 1.7 mm. The conductor line width W12 of the second coil conductor portion 65a is 1.65 mm because it is the average value of the conductor line widths w5 to w8 from the fifth turn to the eighth turn. In the third coil conductor portion 66a, the conductor line width w9 of the ninth turn is 1.0 mm, the conductor line width w10 of the tenth turn is 0.9 mm, and the conductor line width w11 of the eleventh turn is 0.8 mm. The conductor line width w12 of the 12th turn is 0.7 mm. The conductor line width W13 of the third coil conductor portion 66a is 0.85 mm because it is the average value of the conductor line widths w9 to w12 from the ninth turn to the twelfth turn.

次に、第2コイル導体部材62について説明する。第2コイル導体部材62は、図1A、図1B、及び図3に示すように、第1コイル導体部64bと、第2コイル導体部65bと、第3コイル導体部66bとを備える。第1コイル導体部64bは、少なくとも1回(図示例では4回)巻かれた状態に設けられている。第2コイル導体部65bは、少なくとも1回(図示例では4回)巻かれた状態であり、第1コイル導体部64bに比べてコイル開口60から離れて設けられている。第3コイル導体部66bは、少なくとも1回(図示例では4回)巻かれた状態であり、第2コイル導体部65bに比べてコイル開口60から離れて設けられている。   Next, the second coil conductor member 62 will be described. As shown in FIGS. 1A, 1B, and 3, the second coil conductor member 62 includes a first coil conductor portion 64b, a second coil conductor portion 65b, and a third coil conductor portion 66b. The first coil conductor portion 64b is provided in a state of being wound at least once (four times in the illustrated example). The second coil conductor portion 65b is wound at least once (four times in the illustrated example), and is provided farther from the coil opening 60 than the first coil conductor portion 64b. The third coil conductor portion 66b is wound at least once (four times in the illustrated example), and is provided farther from the coil opening 60 than the second coil conductor portion 65b.

第2コイル導体部材62においても、第1コイル導体部材61と同様、第3コイル導体部66bの導体線幅W23は、第1コイル導体部64bの導体線幅W21よりも太く、かつ、第2コイル導体部65bの導体線幅W22よりも細い。   Also in the second coil conductor member 62, like the first coil conductor member 61, the conductor line width W23 of the third coil conductor portion 66b is larger than the conductor line width W21 of the first coil conductor portion 64b. It is narrower than the conductor line width W22 of the coil conductor portion 65b.

ここで、第2コイル導体部材62についても、第1コイル導体部材61と同様、第1コイル導体部64bの導体線幅W21とは、第1コイル導体部64bを構成する線状の導体のうち、第2コイル導体部材62の第2軸に直交しコイル開口60の重心を通る直線L12上に位置する部分の幅をいう。例えば、第1コイル導体部64bの導体線幅W21は、第1コイル導体部64bを構成する線状の導体の第2方向D2における長さである。ここで、第2コイル導体部材62の第2軸に直交しコイル開口60の重心を通る直線L12は、言い換えれば、コイル開口60の重心とコイル導体6の最外周とを結ぶ直線ともいうことができる。また、第2軸の方向において、コイル開口60の重心と第2コイル導体部材62とが異なる位置にある場合、直線L12は、第2軸の方向からの平面視で、第2軸に直交し、コイル開口60の重心とコイル導体6の最外周を結ぶ直線とする。   Here, also about the 2nd coil conductor member 62, like the 1st coil conductor member 61, the conductor line width W21 of the 1st coil conductor part 64b is a linear conductor which comprises the 1st coil conductor part 64b. The width of the portion located on the straight line L12 that is orthogonal to the second axis of the second coil conductor member 62 and passes through the center of gravity of the coil opening 60. For example, the conductor line width W21 of the first coil conductor portion 64b is the length in the second direction D2 of the linear conductor that forms the first coil conductor portion 64b. Here, the straight line L12 orthogonal to the second axis of the second coil conductor member 62 and passing through the center of gravity of the coil opening 60 can also be referred to as a straight line connecting the center of gravity of the coil opening 60 and the outermost periphery of the coil conductor 6. it can. Further, when the center of gravity of the coil opening 60 and the second coil conductor member 62 are in different positions in the direction of the second axis, the straight line L12 is orthogonal to the second axis in plan view from the direction of the second axis. The straight line connecting the center of gravity of the coil opening 60 and the outermost periphery of the coil conductor 6.

なお、本実施形態では、上記の規定を満たす全て(任意)の直線L12上において、第1コイル導体部64bの導体線幅W21、第2コイル導体部65bの導体線幅W22、及び第3コイル導体部66bの導体線幅W23が上記の条件を満たしている。ただし、全ての直線L12上において、導体線幅W21,W22,W23が上記の条件を満たしていることには限定されず、特定の1本の直線L12上において、導体線幅W21,W22,W23が上記の条件を満たしていてもよい。   In the present embodiment, the conductor line width W21 of the first coil conductor portion 64b, the conductor line width W22 of the second coil conductor portion 65b, and the third coil on all (arbitrary) straight lines L12 that satisfy the above-mentioned definition. The conductor line width W23 of the conductor portion 66b satisfies the above conditions. However, the conductor line widths W21, W22, and W23 are not limited to satisfy the above-mentioned conditions on all the straight lines L12, and the conductor line widths W21, W22, and W23 are not limited to one particular straight line L12. May satisfy the above conditions.

第1コイル導体部64bが第2軸の周りに円状に巻かれているような形状である場合、第1コイル導体部64bの導体線幅W21は、第1コイル導体部64bを構成する線状の導体において長手方向(円周方向)に直交する短手方向の長さをいう。この場合、第1コイル導体部64bを構成する線状の導体の長手方向が円周方向に沿っているから、上記導体の短手方向が半径方向となる。   When the first coil conductor portion 64b is shaped like a circle wound around the second axis, the conductor wire width W21 of the first coil conductor portion 64b is a line constituting the first coil conductor portion 64b. This is the length in the short direction perpendicular to the longitudinal direction (circumferential direction). In this case, since the longitudinal direction of the linear conductor constituting the first coil conductor portion 64b is along the circumferential direction, the short direction of the conductor is the radial direction.

また、第1コイル導体部64bが複数回巻かれているような形状である場合、第1コイル導体部64bの導体線幅W21とは、第1コイル導体部64bを構成する線状の導体のうち、第2コイル導体部材62の第2軸に直交しコイル開口60の重心を通る直線L12上に位置する複数の部分の幅の平均値をいう。例えば、第1コイル導体部64bが4回巻かれているような形状である場合、つまり、第2方向D2において4か所の導体部分がある場合、第1コイル導体部64bの導体線幅W21は、上記4か所の導体部分の第2方向D2における長さの平均値である。   In addition, when the first coil conductor portion 64b has a shape that is wound a plurality of times, the conductor line width W21 of the first coil conductor portion 64b is the linear conductor constituting the first coil conductor portion 64b. Among these, the average value of the widths of a plurality of portions located on a straight line L12 that is orthogonal to the second axis of the second coil conductor member 62 and passes through the center of gravity of the coil opening 60 is referred to. For example, when the shape is such that the first coil conductor portion 64b is wound four times, that is, when there are four conductor portions in the second direction D2, the conductor line width W21 of the first coil conductor portion 64b. Is an average value of the lengths of the four conductor portions in the second direction D2.

第2コイル導体部65bについても、第1コイル導体部64bと同様、第2コイル導体部65bの導体線幅W22とは、第2コイル導体部65bを構成する線状の導体のうち、第2コイル導体部材62の第2軸に直交しコイル開口60の重心を通る直線L12上に位置する複数の部分の幅をいう。例えば、第2コイル導体部65bの導体線幅W22は、第2コイル導体部65bを構成する線状の導体の第2方向D2における長さである。   Similarly to the first coil conductor portion 64b, the second coil conductor portion 65b also has a conductor line width W22 of the second coil conductor portion 65b, which is the second of the linear conductors constituting the second coil conductor portion 65b. The width of a plurality of portions located on a straight line L12 that is orthogonal to the second axis of the coil conductor member 62 and passes through the center of gravity of the coil opening 60 is referred to. For example, the conductor line width W22 of the second coil conductor portion 65b is the length in the second direction D2 of the linear conductor constituting the second coil conductor portion 65b.

第2コイル導体部65bが第2軸の周りに円状に巻かれているような形状である場合、第2コイル導体部65bの導体線幅W22は、第2コイル導体部65bを構成する線状の導体において長手方向(円周方向)に直交する短手方向の長さをいう。この場合、第2コイル導体部65bを構成する線状の導体の長手方向が円周方向に沿っているから、上記導体の短手方向が半径方向となる。   When the second coil conductor portion 65b is shaped like a circle wound around the second axis, the conductor wire width W22 of the second coil conductor portion 65b is a line constituting the second coil conductor portion 65b. This is the length in the short direction perpendicular to the longitudinal direction (circumferential direction). In this case, since the longitudinal direction of the linear conductor constituting the second coil conductor portion 65b is along the circumferential direction, the short direction of the conductor is the radial direction.

また、第2コイル導体部65bが複数回巻かれているような形状である場合、第2コイル導体部65bの導体線幅W22とは、第2コイル導体部65bを構成する線状の導体のうち、第2コイル導体部材62の第2軸に直交しコイル開口60の重心を通る直線L12上に位置する複数の部分の幅の平均値をいう。例えば、第2コイル導体部65bが4回巻かれているような形状である場合、つまり、第2方向D2において4か所の導体部分がある場合、第2コイル導体部65bの導体線幅W22は、上記4か所の導体部分の第2方向D2における長さの平均値である。   Further, when the second coil conductor portion 65b has a shape that is wound a plurality of times, the conductor line width W22 of the second coil conductor portion 65b is the linear conductor constituting the second coil conductor portion 65b. Among these, the average value of the widths of a plurality of portions located on a straight line L12 that is orthogonal to the second axis of the second coil conductor member 62 and passes through the center of gravity of the coil opening 60 is referred to. For example, when the shape is such that the second coil conductor portion 65b is wound four times, that is, when there are four conductor portions in the second direction D2, the conductor line width W22 of the second coil conductor portion 65b. Is an average value of the lengths of the four conductor portions in the second direction D2.

第3コイル導体部66bについても、第1コイル導体部64b及び第2コイル導体部65bと同様、第3コイル導体部66bの導体線幅W23とは、第3コイル導体部66bを構成する線状の導体のうち、第2コイル導体部材62の第2軸に直交しコイル開口60の重心を通る直線L12上に位置する部分の幅をいう。例えば、第3コイル導体部66bの導体線幅W23は、第3コイル導体部66bを構成する線状の導体の第2方向D2における長さである。   Similarly to the first coil conductor portion 64b and the second coil conductor portion 65b, the third coil conductor portion 66b also has a conductor line width W23 of the third coil conductor portion 66b that is a linear shape constituting the third coil conductor portion 66b. Among the conductors, the width of a portion located on a straight line L12 that is orthogonal to the second axis of the second coil conductor member 62 and passes through the center of gravity of the coil opening 60 is referred to. For example, the conductor line width W23 of the third coil conductor portion 66b is the length in the second direction D2 of the linear conductor constituting the third coil conductor portion 66b.

第3コイル導体部66bが第2軸の周りに円状に巻かれているような形状である場合、第3コイル導体部66bの導体線幅W23は、第3コイル導体部66bを構成する線状の導体において長手方向(円周方向)に直交する短手方向の長さをいう。この場合、第3コイル導体部66bを構成する線状の導体の長手方向が円周方向に沿っているから、上記導体の短手方向が半径方向となる。   When the third coil conductor portion 66b is shaped like a circle wound around the second axis, the conductor line width W23 of the third coil conductor portion 66b is a line constituting the third coil conductor portion 66b. This is the length in the short direction perpendicular to the longitudinal direction (circumferential direction). In this case, since the longitudinal direction of the linear conductor constituting the third coil conductor portion 66b is along the circumferential direction, the short direction of the conductor is the radial direction.

また、第3コイル導体部66bが複数回巻かれているような形状である場合、第3コイル導体部66bの導体線幅W23とは、第3コイル導体部66bを構成する線状の導体のうち、第2コイル導体部材62の第2軸に直交しコイル開口60の重心を通る直線L12上に位置する複数の部分の幅の平均値をいう。例えば、第3コイル導体部66bが4回巻かれているような形状である場合、つまり、第2方向D2において4か所の導体部分がある場合、第3コイル導体部66bの導体線幅W23は、上記4か所の導体部分の第2方向D2における長さの平均値である。   In addition, when the third coil conductor portion 66b has a shape that is wound a plurality of times, the conductor line width W23 of the third coil conductor portion 66b is the linear conductor that constitutes the third coil conductor portion 66b. Among these, the average value of the widths of a plurality of portions located on a straight line L12 that is orthogonal to the second axis of the second coil conductor member 62 and passes through the center of gravity of the coil opening 60 is referred to. For example, when the shape is such that the third coil conductor portion 66b is wound four times, that is, when there are four conductor portions in the second direction D2, the conductor line width W23 of the third coil conductor portion 66b. Is an average value of the lengths of the four conductor portions in the second direction D2.

図1Aに示す例の場合、第1コイル導体部材61と同様、第2コイル導体部材62は12回巻かれた状態に設けられている。第2コイル導体部材62における1ターン目から12ターン目までの導体線幅w1〜w12の関係は、第1コイル導体部材61と同様であり、図4に示すとおりである。   In the case of the example shown in FIG. 1A, like the first coil conductor member 61, the second coil conductor member 62 is provided in a state of being wound 12 times. The relationship of the conductor line widths w1 to w12 from the first turn to the twelfth turn in the second coil conductor member 62 is the same as that of the first coil conductor member 61 and is as shown in FIG.

図4に示す例では、第1コイル導体部64bでは、1ターン目から4ターン目までの導体線幅w1〜w4は0.5mmである。したがって、第1コイル導体部64bの導体線幅W21は0.5mmである。第2コイル導体部65bでは、5ターン目及び8ターン目の導体線幅w5,w8は1.6mmであり、6ターン目及び7ターン目の導体線幅w6,w7は1.7mmである。第2コイル導体部65bの導体線幅W22は、5ターン目から8ターン目までの導体線幅w5〜w8の平均値であるから、1.65mmである。第3コイル導体部66bでは、9ターン目の導体線幅w9は1.0mmであり、10ターン目の導体線幅w10は0.9mmであり、11ターン目の導体線幅w11は0.8mmであり、12ターン目の導体線幅w12は0.7mmである。第3コイル導体部66bの導体線幅W23は、9ターン目から12ターン目までの導体線幅w9〜w12の平均値であるから、0.85mmである。   In the example shown in FIG. 4, in the first coil conductor portion 64b, the conductor line widths w1 to w4 from the first turn to the fourth turn are 0.5 mm. Therefore, the conductor line width W21 of the first coil conductor portion 64b is 0.5 mm. In the second coil conductor portion 65b, the conductor line widths w5 and w8 for the fifth and eighth turns are 1.6 mm, and the conductor line widths w6 and w7 for the sixth and seventh turns are 1.7 mm. The conductor line width W22 of the second coil conductor portion 65b is 1.65 mm because it is the average value of the conductor line widths w5 to w8 from the fifth turn to the eighth turn. In the third coil conductor portion 66b, the conductor line width w9 of the ninth turn is 1.0 mm, the conductor line width w10 of the tenth turn is 0.9 mm, and the conductor line width w11 of the eleventh turn is 0.8 mm. The conductor line width w12 of the 12th turn is 0.7 mm. Since the conductor line width W23 of the third coil conductor portion 66b is an average value of the conductor line widths w9 to w12 from the ninth turn to the twelfth turn, it is 0.85 mm.

上記のような導体線幅の関係を有するコイル導体6の周囲には、図6に示すような磁束が発生する。図6の矢印は、磁束を表す。   A magnetic flux as shown in FIG. 6 is generated around the coil conductor 6 having the above-described conductor line width relationship. The arrows in FIG. 6 represent magnetic flux.

まず、コイル導体6の内周側に位置する第1コイル導体部64a,64bでは、第1コイル導体部64aの導体線幅W11が第2コイル導体部65aの導体線幅W12よりも細く、かつ、第1コイル導体部64bの導体線幅W21が第2コイル導体部65bの導体線幅W22よりも細い。このため、第1コイル導体部64a,64bでは、第2コイル導体部65a,65bに比べて、第1方向D1の磁束が強い。第1コイル導体部64a,64bでは、第2コイル導体部65a,65bに比べて、電流密度が高いから、導体の周りの磁束密度も大きい。   First, in the first coil conductor portions 64a and 64b located on the inner peripheral side of the coil conductor 6, the conductor wire width W11 of the first coil conductor portion 64a is narrower than the conductor wire width W12 of the second coil conductor portion 65a, and The conductor line width W21 of the first coil conductor part 64b is narrower than the conductor line width W22 of the second coil conductor part 65b. For this reason, in the 1st coil conductor parts 64a and 64b, the magnetic flux of the 1st direction D1 is strong compared with the 2nd coil conductor parts 65a and 65b. Since the first coil conductor portions 64a and 64b have a higher current density than the second coil conductor portions 65a and 65b, the magnetic flux density around the conductor is also large.

同様に、コイル導体6の外周側に位置する第3コイル導体部66a,66bでも、第3コイル導体部66aの導体線幅W13が第2コイル導体部65aの導体線幅W12よりも細く、かつ、第3コイル導体部66bの導体線幅W23が第2コイル導体部65bの導体線幅W22よりも細い。このため、第3コイル導体部66a,66bでも、第2コイル導体部65a,65bに比べて、第1方向D1の磁束が強い。第3コイル導体部66a,66bでは、第2コイル導体部65a,65bに比べて、電流密度が高いから、導体の周りの磁束密度も大きい。   Similarly, in the third coil conductor portions 66a and 66b located on the outer peripheral side of the coil conductor 6, the conductor line width W13 of the third coil conductor portion 66a is narrower than the conductor line width W12 of the second coil conductor portion 65a, and The conductor line width W23 of the third coil conductor portion 66b is narrower than the conductor line width W22 of the second coil conductor portion 65b. For this reason, also in the 3rd coil conductor parts 66a and 66b, the magnetic flux of the 1st direction D1 is strong compared with the 2nd coil conductor parts 65a and 65b. Since the third coil conductor portions 66a and 66b have a higher current density than the second coil conductor portions 65a and 65b, the magnetic flux density around the conductor is also high.

また、導体線幅W11,W21及び導体線幅W13,W23を細くすることにより、第1コイル導体部64a,64b及び第3コイル導体部66a,66bにおいて、磁束が鎖交する面積を小さくすることができる。これにより、第1コイル導体部64a,64b及び第3コイル導体部66a,66bに発生する渦電流を低減させることができる。   Further, by reducing the conductor line widths W11 and W21 and the conductor line widths W13 and W23, the area where the magnetic flux links in the first coil conductor portions 64a and 64b and the third coil conductor portions 66a and 66b is reduced. Can do. Thereby, the eddy current which generate | occur | produces in the 1st coil conductor parts 64a and 64b and the 3rd coil conductor parts 66a and 66b can be reduced.

一方、第1コイル導体部64aと第3コイル導体部66aとの間に位置する第2コイル導体部65aでは、第2コイル導体部65aの導体線幅W12が第1コイル導体部64aの導体線幅W11及び第3コイル導体部66aの導体線幅W13よりも太い。また、第1コイル導体部64bと第3コイル導体部66bとの間に位置する第2コイル導体部65bでは、第2コイル導体部65bの導体線幅W22が第1コイル導体部64bの導体線幅W21及び第3コイル導体部66bの導体線幅W23よりも太い。このため、第1コイル導体部64a,64b及び第3コイル導体部66a,66bに比べて、第2方向D2の磁束が強い。第2コイル導体部65a,65bでは、導体部分に遮られるため、第1方向D1の磁束が少ない。   On the other hand, in the second coil conductor portion 65a located between the first coil conductor portion 64a and the third coil conductor portion 66a, the conductor wire width W12 of the second coil conductor portion 65a is the conductor wire of the first coil conductor portion 64a. It is thicker than the width W11 and the conductor line width W13 of the third coil conductor portion 66a. In the second coil conductor portion 65b located between the first coil conductor portion 64b and the third coil conductor portion 66b, the conductor line width W22 of the second coil conductor portion 65b is the conductor wire of the first coil conductor portion 64b. It is thicker than the width W21 and the conductor line width W23 of the third coil conductor portion 66b. For this reason, the magnetic flux in the second direction D2 is stronger than the first coil conductor portions 64a and 64b and the third coil conductor portions 66a and 66b. Since the second coil conductor portions 65a and 65b are blocked by the conductor portion, the magnetic flux in the first direction D1 is small.

上記のような導体線幅W11〜W13,W21〜W23の関係を有するコイル導体6は、導体線幅が一定であるコイル導体に比べて、コイル導体6の抵抗を小さくすることができる。これにより、コイルアンテナ2と相手側アンテナ9との結合の強さを表す結合度kの大きさを保ちつつ、コイルアンテナ2のQ値(=2πfL/R)を大きくすることができる(L:コイル導体6のインダクタンス、R:コイル導体6の抵抗、f:周波数)。その結果、本実施形態に係るコイルアンテナ2では、コイルアンテナ2の性能を表す指標であるkQ積を向上させることができる。kQ積が大きいほど送電効率が向上する。   The coil conductor 6 having the relationship of the conductor line widths W11 to W13 and W21 to W23 as described above can reduce the resistance of the coil conductor 6 as compared with the coil conductor having a constant conductor line width. As a result, the Q value (= 2πfL / R) of the coil antenna 2 can be increased while maintaining the magnitude of the degree of coupling k representing the strength of coupling between the coil antenna 2 and the counterpart antenna 9 (L: Inductance of coil conductor 6, R: resistance of coil conductor 6, f: frequency). As a result, in the coil antenna 2 according to the present embodiment, the kQ product that is an index representing the performance of the coil antenna 2 can be improved. The larger the kQ product, the better the transmission efficiency.

例えば、第1コイル導体部64a,64bの導体線幅W11,W21が0.5mmであり、第2コイル導体部65a,65bの導体線幅W12,W22が1.65mmであり、第3コイル導体部66a,66bの導体線幅W13,W23が0.85mmである場合、全ての導体線幅が1.0mmと一定であるコイル導体に比べて、結合度kを略一定に保ちつつ、Q値を大きくすることができる。その結果、kQ積を20%程度大きくすることができる。   For example, the conductor coil widths W11 and W21 of the first coil conductor portions 64a and 64b are 0.5 mm, the conductor wire widths W12 and W22 of the second coil conductor portions 65a and 65b are 1.65 mm, and the third coil conductor When the conductor line widths W13 and W23 of the portions 66a and 66b are 0.85 mm, the Q value is maintained while keeping the coupling degree k substantially constant as compared with the coil conductor in which all the conductor line widths are constant at 1.0 mm. Can be increased. As a result, the kQ product can be increased by about 20%.

ところで、コイル導体6の第1コイル導体部材61及び第2コイル導体部材62において、第1コイル導体部64a,64b、第2コイル導体部65a,65b、及び第3コイル導体部66a,66bにおける全ての線間幅δ1は、第1コイル導体部64a,64bの導体線幅W11,W21、第2コイル導体部65a,65bの導体線幅W12,W22、及び第3コイル導体部66a,66bの導体線幅W13,W23よりも細い。例えば、第1コイル導体部64a,64bの導体線幅W11,W21が0.5mm、第2コイル導体部65a,65bの導体線幅W12,W22が1.65mm、第3コイル導体部66a,66bの導体線幅W13,W23が0.85mmであるのに対し、線間幅δ1は、全て0.15mmである。   By the way, in the 1st coil conductor member 61 and the 2nd coil conductor member 62 of the coil conductor 6, all in the 1st coil conductor parts 64a and 64b, the 2nd coil conductor parts 65a and 65b, and the 3rd coil conductor parts 66a and 66b. Is the conductor line widths W11 and W21 of the first coil conductor portions 64a and 64b, the conductor line widths W12 and W22 of the second coil conductor portions 65a and 65b, and the conductors of the third coil conductor portions 66a and 66b. It is narrower than the line widths W13 and W23. For example, the conductor wire widths W11 and W21 of the first coil conductor portions 64a and 64b are 0.5 mm, the conductor wire widths W12 and W22 of the second coil conductor portions 65a and 65b are 1.65 mm, and the third coil conductor portions 66a and 66b. The conductor line widths W13 and W23 are 0.85 mm, whereas the line width δ1 is 0.15 mm.

上記より、第1コイル導体部材61及び第2コイル導体部材62の各々において、線間幅δ1が導体線幅W11〜W13,W21〜W23よりも細いので、線間を通る磁束を低減させることができる。   From the above, in each of the first coil conductor member 61 and the second coil conductor member 62, the line width δ1 is narrower than the conductor line widths W11 to W13, W21 to W23, so that the magnetic flux passing between the lines can be reduced. it can.

ところで、本実施形態のコイル導体6では、第1コイル導体部材61及び第2コイル導体部材62の各々において、第1コイル導体部64a,64bは、上述したように、複数回巻かれた状態に設けられている。そして、第1コイル導体部64a,64bにおいて、コイル開口60の重心とコイル導体6の最外周とを結ぶ直線L11,L12上に位置する複数の導体部分の導体線幅w1〜w4は、コイル開口60の重心からの距離に関係なく一定である(図4参照)。上記より、第1コイル導体部64a,64bを容易に作成することができる。   By the way, in the coil conductor 6 of this embodiment, in each of the first coil conductor member 61 and the second coil conductor member 62, the first coil conductor portions 64a and 64b are in a state of being wound a plurality of times as described above. Is provided. And in 1st coil conductor part 64a, 64b, conductor wire width w1-w4 of the some conductor part located on the straight lines L11 and L12 which connect the gravity center of the coil opening 60 and the outermost periphery of the coil conductor 6 is coil opening. It is constant regardless of the distance from the center of gravity of 60 (see FIG. 4). From the above, the first coil conductor portions 64a and 64b can be easily created.

一方、本実施形態のコイル導体6では、第1コイル導体部材61及び第2コイル導体部材62の各々において、第3コイル導体部66a,66bは、上述したように、複数回巻かれた状態に設けられている。そして、第3コイル導体部66a,66bにおいて、コイル開口60の重心とコイル導体6の最外周とを結ぶ直線L11,L12上に位置する複数の導体部分の導体線幅w9〜w12は、コイル開口60の重心から離れるほど細くなる(図4参照)。上述したように、導体線幅が細いほど第1方向D1の磁束が強くなり、導体線幅が太いほど第2方向D2の磁束が強くなる。上記より、コイル導体6の外周側における磁束の方向を水平方向から垂直方向へ容易に変えることができ、図6に示すような、磁束のループC1を形成しやすくなる。   On the other hand, in the coil conductor 6 of the present embodiment, in each of the first coil conductor member 61 and the second coil conductor member 62, the third coil conductor portions 66a and 66b are wound in a plurality of turns as described above. Is provided. And in 3rd coil conductor part 66a, 66b, conductor wire width w9-w12 of the some conductor part located on the straight line L11, L12 which connects the gravity center of the coil opening 60 and the outermost periphery of the coil conductor 6 is coil opening. It becomes so thin that it leaves | separates from the gravity center of 60 (refer FIG. 4). As described above, the thinner the conductor line width, the stronger the magnetic flux in the first direction D1, and the thicker the conductor line width, the stronger the magnetic flux in the second direction D2. From the above, the direction of the magnetic flux on the outer peripheral side of the coil conductor 6 can be easily changed from the horizontal direction to the vertical direction, and the magnetic flux loop C1 as shown in FIG. 6 can be easily formed.

また、本実施形態のコイル導体6では、第1コイル導体部材61及び第2コイル導体部材62の各々において、第2コイル導体部65a,65bは、上述したように、複数回巻かれた状態に設けられている。そして、第2コイル導体部65a,65bにおいて、コイル開口60の重心とコイル導体6の最外周とを結ぶ直線L11;L12上に位置する複数の導体部分の導体線幅w5〜w8は、第2コイル導体部65a,65bの中央に近づくほど太くなる(図4参照)。例えば、5ターン目の導体線幅w5及び8ターン目の導体線幅w8が1.6mmであるのに対し、6ターン目の導体線幅w6及び7ターン目の導体線幅w7は1.7mmである。   Further, in the coil conductor 6 of the present embodiment, in each of the first coil conductor member 61 and the second coil conductor member 62, the second coil conductor portions 65a and 65b are wound in a plurality of turns as described above. Is provided. In the second coil conductor portions 65a and 65b, the conductor line widths w5 to w8 of the plurality of conductor portions located on the straight line L11; L12 connecting the center of gravity of the coil opening 60 and the outermost periphery of the coil conductor 6 are the second The coil conductor portions 65a and 65b become thicker as they approach the center (see FIG. 4). For example, the conductor line width w5 of the fifth turn and the conductor line width w8 of the eighth turn are 1.6 mm, whereas the conductor line width w6 of the sixth turn and the conductor line width w7 of the seventh turn are 1.7 mm. It is.

ところで、第1コイル導体部材61及び第2コイル導体部材62の各々において、第1コイル導体部64a,64bの2つの領域幅A3の各々は、相手側アンテナ9におけるコイル導体91のコイル開口92の開口幅A2とコイル開口60の開口幅A1との差の2分の1以下である。相手側アンテナ9が送電側アンテナであり、本実施形態に係るコイルアンテナ2が受電側アンテナである場合、コイル導体91の最内周付近の磁束密度が最も高い。上記より、相手側アンテナ9からの磁束が最大となる部分に、導体線幅の細い第1コイル導体部64a,64bを位置させることができる。なお、コイル導体6のコイル開口60及びコイル導体91のコイル開口92は、用途又は規格に応じて異なる。例えばQiの規格に基づいてワイヤレス給電のために用いられる場合、コイル開口60の直径は16.5mmであり、コイル開口92の直径は20mmである。   By the way, in each of the first coil conductor member 61 and the second coil conductor member 62, each of the two area widths A3 of the first coil conductor portions 64a and 64b corresponds to the coil opening 92 of the coil conductor 91 in the counterpart antenna 9. This is less than half of the difference between the opening width A2 and the opening width A1 of the coil opening 60. When the counterpart antenna 9 is a power transmission antenna and the coil antenna 2 according to this embodiment is a power reception antenna, the magnetic flux density near the innermost circumference of the coil conductor 91 is the highest. As described above, the first coil conductor portions 64a and 64b having a narrow conductor line width can be positioned in the portion where the magnetic flux from the counterpart antenna 9 is maximized. In addition, the coil opening 60 of the coil conductor 6 and the coil opening 92 of the coil conductor 91 differ according to a use or a specification. For example, when used for wireless power supply based on the Qi standard, the coil opening 60 has a diameter of 16.5 mm and the coil opening 92 has a diameter of 20 mm.

(2.2.4)コイル導体の線間数
コイル導体6の第1コイル導体部材61は、図7に示すように、4回以上(図示例では12回)巻かれた状態に設けられている。
(2.2.4) Number of Coil Conductor Lines As shown in FIG. 7, the first coil conductor member 61 of the coil conductor 6 is provided in a state of being wound four times or more (12 times in the illustrated example). Yes.

図7に示すように、第1コイル導体部材61は、第1領域B11、第2領域B12、及び第3領域B13を有する。第1領域B11、第2領域B12、及び第3領域B13は、コイル開口60の重心とコイル導体6の最外周とを結ぶ直線L11上において、第1コイル導体部材61の最内周と第1コイル導体部材61の最外周との間の長さを3等分して得られる。   As shown in FIG. 7, the first coil conductor member 61 has a first region B11, a second region B12, and a third region B13. The first region B11, the second region B12, and the third region B13 are located on the straight line L11 that connects the center of gravity of the coil opening 60 and the outermost periphery of the coil conductor 6, and the first innermost periphery of the first coil conductor member 61 and the first region B11. It is obtained by dividing the length between the coil conductor member 61 and the outermost periphery into three equal parts.

第1領域B11は、第2領域B12に比べてコイル開口60に近接する。第2領域B12は、第3領域B13に比べてコイル開口60に近接する。第3領域B13は、第1領域B11及び第2領域B12に比べて外周側に位置する。   The first region B11 is closer to the coil opening 60 than the second region B12. The second region B12 is closer to the coil opening 60 than the third region B13. The third region B13 is located on the outer peripheral side compared to the first region B11 and the second region B12.

第1領域B11は、第1コイル導体部材61を構成する線状の導体のうち、3回以上巻かれた状態の導体部分である。つまり、第1領域B11内には、2つ以上の線間が存在する。第3領域B13は、第1コイル導体部材61を構成する線状の導体のうち、2回以上巻かれた状態の導体部分である。つまり、第3領域B13には、1つ以上の線間が存在する。これに対して、第2領域B12は、第1コイル導体部材61を構成する線状の導体のうち、1回以上巻かれた状態の導体部分である。つまり、第2領域B12が1回巻かれた状態の導体部分である場合、第2領域B12内には、線間が存在しない。一方、第2領域B12が2回以上巻かれた状態の導体部分である場合、第2領域B12内には、1つ以上の線間が存在する。   The first region B <b> 11 is a conductor portion that is wound three or more times among the linear conductors constituting the first coil conductor member 61. That is, there are two or more lines in the first region B11. The third region B <b> 13 is a conductor portion in a state of being wound twice or more among the linear conductors constituting the first coil conductor member 61. That is, one or more lines exist in the third region B13. On the other hand, 2nd area | region B12 is a conductor part of the state wound more than once among the linear conductors which comprise the 1st coil conductor member 61. FIG. That is, when the second region B12 is a conductor portion wound once, there is no line spacing in the second region B12. On the other hand, when the second region B12 is a conductor portion wound twice or more, one or more lines exist in the second region B12.

上記のような第1コイル導体部材61において、第3領域B13内の直線L11上における線間数は、第1領域B11内の直線L11上における線間数よりも少なく、かつ、第2領域B12内の直線L11上における線間数よりも多い。図7の例では、第1領域B11内の線間数は5つであり、第2領域B12内の線間数は2つであり、第3領域B13内の線間数は4つである。他の例としては、第1コイル導体部材61が4回巻かれた状態に設けられている場合がある。第1コイル導体部材61全体における線間数の総数は3つである。この場合、第1領域B11内の線間数は2つであり、第2領域B12内の線間数は0であり、第3領域B13内の線間数は1つである。   In the first coil conductor member 61 as described above, the number of lines on the straight line L11 in the third region B13 is smaller than the number of lines on the straight line L11 in the first region B11, and the second region B12. More than the number of lines on the straight line L11. In the example of FIG. 7, the number of lines in the first area B11 is five, the number of lines in the second area B12 is two, and the number of lines in the third area B13 is four. . As another example, the first coil conductor member 61 may be provided in a state where it is wound four times. The total number of lines between the first coil conductor members 61 is three. In this case, the number of lines in the first region B11 is two, the number of lines in the second region B12 is zero, and the number of lines in the third region B13 is one.

第1領域B11、第2領域B12、及び第3領域B13は3等分して得られた領域であるから、第1領域B11と第2領域B12と第3領域B13との直線L11上における長さは同一である。したがって、線間数が多いほど、領域内に含まれる導体部分の導体線幅は細くなり、線間数が少ないほど、領域内に含まれる導体の導体線幅は太くなる。なお、線間幅δ1は一定である。   Since the first region B11, the second region B12, and the third region B13 are regions obtained by dividing into three equal parts, the length of the first region B11, the second region B12, and the third region B13 on the straight line L11 is long. Is the same. Therefore, the larger the number of lines, the thinner the conductor line width of the conductor portion included in the region, and the smaller the number of lines, the thicker the conductor line width of the conductor included in the region. The line width δ1 is constant.

第2コイル導体部材62も、第1コイル導体部材61と同様、3回以上(図示例では12回)巻かれた状態に設けられている。   Similarly to the first coil conductor member 61, the second coil conductor member 62 is also provided in a state of being wound three or more times (12 times in the illustrated example).

第2コイル導体部材62は、第1領域B21、第2領域B22、及び第3領域B23を有する。第1領域B21、第2領域B22、及び第3領域B23は、コイル開口60の重心とコイル導体6の最外周とを結ぶ直線L12上において、第2コイル導体部材62の最内周と第2コイル導体部材62の最外周との間の距離を3等分して得られる。   The second coil conductor member 62 has a first region B21, a second region B22, and a third region B23. The first region B21, the second region B22, and the third region B23 are located on the straight line L12 that connects the center of gravity of the coil opening 60 and the outermost periphery of the coil conductor 6, and the second innermost periphery of the second coil conductor member 62 and the second region B23. The distance from the outermost periphery of the coil conductor member 62 is obtained by dividing it into three equal parts.

第1領域B21は、第2領域B22に比べてコイル開口60に近接する。第2領域B22は、第3領域B23に比べてコイル開口60に近接する。第3領域B23は、第1領域B21及び第2領域B22に比べて外周側に位置する。   The first region B21 is closer to the coil opening 60 than the second region B22. The second region B22 is closer to the coil opening 60 than the third region B23. The third region B23 is located on the outer peripheral side compared to the first region B21 and the second region B22.

第1領域B21は、第2コイル導体部材62を構成する線状の導体のうち、3回以上巻かれた状態の導体部分である。つまり、第1領域B21内には、2つ以上の線間が存在する。第3領域B23は、第2コイル導体部材62を構成する線状の導体のうち、2回以上巻かれた状態の導体部分である。つまり、第3領域B23には、1つ以上の線間が存在する。これに対して、第2領域B22は、第2コイル導体部材62を構成する線状の導体のうち、1回以上巻かれた状態の導体部分である。つまり、第2領域B22が1回巻かれた状態の導体部分である場合、第2領域B22内には、線間が存在しない。一方、第2領域B22が2回以上巻かれた状態の導体部分である場合、第2領域B22内には、1つ以上の線間が存在する。   The first region B <b> 21 is a conductor portion that is wound three or more times among the linear conductors that constitute the second coil conductor member 62. That is, there are two or more lines in the first region B21. The third region B <b> 23 is a conductor portion that is wound twice or more among the linear conductors that constitute the second coil conductor member 62. That is, one or more lines exist in the third region B23. On the other hand, 2nd area | region B22 is a conductor part of the state wound one or more times among the linear conductors which comprise the 2nd coil conductor member 62. FIG. That is, when the second region B22 is a conductor portion wound once, there is no line space in the second region B22. On the other hand, when the second region B22 is a conductor portion wound two or more times, one or more lines exist in the second region B22.

上記のような第2コイル導体部材62において、第3領域B23内の直線L12上における線間数は、第1領域B21内の直線L12上における線間数よりも少なく、かつ、第2領域B22内の直線L12上における線間数よりも多い。図7の例では、第1領域B21内の線間数は5つであり、第2領域B22内の線間数は2つであり、第3領域B23内の線間数は4つである。他の例としては、第2コイル導体部材62が4回巻かれた状態に設けられている場合がある。第2コイル導体部材62全体における線間数の総数は3つである。この場合、第1領域B21内の線間数は2つであり、第2領域B22内の線間数は0であり、第3領域B23内の線間数は1つである。   In the second coil conductor member 62 as described above, the number of lines on the straight line L12 in the third region B23 is smaller than the number of lines on the straight line L12 in the first region B21, and the second region B22. More than the number of lines on the straight line L12. In the example of FIG. 7, the number of lines in the first region B21 is five, the number of lines in the second region B22 is two, and the number of lines in the third region B23 is four. . As another example, the second coil conductor member 62 may be provided in a state of being wound four times. The total number of lines between the second coil conductor members 62 as a whole is three. In this case, the number of lines in the first region B21 is two, the number of lines in the second region B22 is 0, and the number of lines in the third region B23 is one.

第1領域B21、第2領域B22、及び第3領域B23は3等分して得られた領域であるから、第1領域B21と第2領域B22と第3領域B23との直線L12上における長さは同一である。したがって、線間数が多いほど、領域内に含まれる導体部分の導体線幅は細くなり、線間数が少ないほど、領域内に含まれる導体の導体線幅は太くなる。なお、第2コイル導体部材62においても、線間幅δ1は一定である。   Since the first region B21, the second region B22, and the third region B23 are regions obtained by dividing into three equal parts, the length of the first region B21, the second region B22, and the third region B23 on the straight line L12 Is the same. Therefore, the larger the number of lines, the thinner the conductor line width of the conductor portion included in the region, and the smaller the number of lines, the thicker the conductor line width of the conductor included in the region. Also in the second coil conductor member 62, the line width δ1 is constant.

上記のような導体線幅の関係を有するコイル導体6の周囲には、図6に示すような磁束が発生する。   A magnetic flux as shown in FIG. 6 is generated around the coil conductor 6 having the above-described conductor line width relationship.

コイル導体6の内周側に位置する第1領域B11,B21の導体線幅の平均値は、第2領域B12,B22の導体線幅の平均値よりも細いため、第1領域B11,B21では、第2領域B12,B22に比べて、第1方向D1の磁束が強くなる。第1領域B11,B21では、電流密度が高いから、導体の周りの磁束密度も大きくなる。同様に、コイル導体6の外周側に位置する第3領域B13,B23の導体線幅の平均値も、第2領域B12,B22の導体線幅の平均値よりも細いため、第3領域B13,B23では、第2領域B12,B22に比べて、第1方向D1の磁束が強くなる。第3領域B13,B23では、電流密度が高いから、導体の周りの磁束密度も大きくなる。   Since the average value of the conductor line widths of the first regions B11 and B21 located on the inner peripheral side of the coil conductor 6 is thinner than the average value of the conductor line widths of the second regions B12 and B22, in the first regions B11 and B21, Compared with the second regions B12 and B22, the magnetic flux in the first direction D1 becomes stronger. In the first regions B11 and B21, since the current density is high, the magnetic flux density around the conductor is also increased. Similarly, since the average value of the conductor line widths of the third regions B13 and B23 located on the outer peripheral side of the coil conductor 6 is also thinner than the average value of the conductor line widths of the second regions B12 and B22, the third regions B13, In B23, the magnetic flux in the first direction D1 is stronger than in the second regions B12 and B22. In the third regions B13 and B23, since the current density is high, the magnetic flux density around the conductor also increases.

一方、第1領域B11,B21と第3領域B13,B23との間に位置する第2領域B12,B22の導体線幅は、第1領域B11,B21の導体線幅及び第3領域B13,B23の導体線幅よりも太いため、第2領域B12,B22では、第1領域B11,B21及び第3領域B13,B23に比べて、第2方向D2の磁束が強くなる。第2領域B12,B22では、導体部分に遮られるため、第1方向D1の磁束が少ない。これにより、コイル導体6の最外周における磁束の方向を水平方向から垂直方向へ容易に変えることができ、図6に示すような、磁束のループC1が形成される。   On the other hand, the conductor line widths of the second regions B12 and B22 located between the first regions B11 and B21 and the third regions B13 and B23 are the conductor line widths of the first regions B11 and B21 and the third regions B13 and B23. Therefore, in the second regions B12 and B22, the magnetic flux in the second direction D2 is stronger in the second regions B12 and B22 than in the first regions B11 and B21 and the third regions B13 and B23. In 2nd area | region B12, B22, since it is interrupted | blocked by a conductor part, there are few magnetic fluxes in the 1st direction D1. Thereby, the direction of the magnetic flux in the outermost periphery of the coil conductor 6 can be easily changed from the horizontal direction to the vertical direction, and a magnetic flux loop C1 as shown in FIG. 6 is formed.

上記のような導体線幅の関係を有するコイル導体6は、上述したように、導体線幅が一定であるコイル導体に比べて、コイル導体6の抵抗を小さくすることができる。これにより、コイルアンテナ2と相手側アンテナ9との結合度kの大きさを保ちつつ、コイルアンテナ2のQ値を大きくすることができる。その結果、本実施形態に係るコイルアンテナ2では、コイルアンテナ2の性能を表す指標であるkQ積を向上させることができる。   As described above, the coil conductor 6 having the conductor line width relationship as described above can reduce the resistance of the coil conductor 6 as compared with the coil conductor having a constant conductor line width. Accordingly, the Q value of the coil antenna 2 can be increased while maintaining the degree of coupling k between the coil antenna 2 and the counterpart antenna 9. As a result, in the coil antenna 2 according to the present embodiment, the kQ product that is an index representing the performance of the coil antenna 2 can be improved.

(2.2.5)接続端子
2つの接続端子21は、図2に示すように、制御部81(図8参照)などの外部回路とコイル導体6とを電気的に接続するために、基材5に形成されている。2つの接続端子21は、コイル導体6の両端に接続されており、コイル導体6の両端以外と電気的に絶縁するように形成されている。
(2.2.5) Connection Terminal As shown in FIG. 2, the two connection terminals 21 are connected to an external circuit such as the control unit 81 (see FIG. 8) and the coil conductor 6 in order to electrically connect them. It is formed on the material 5. The two connection terminals 21 are connected to both ends of the coil conductor 6 and are formed so as to be electrically insulated from other than the both ends of the coil conductor 6.

(2.2.6)第1保護層
第1保護層41は、図1Aに示すように、基材5の第1主面51に設けられた第1コイル導体部材61を覆い、外力などから第1コイル導体部材61を保護する。第1保護層41は、樹脂などの電気絶縁材料により板状又はシート状に形成されている。第1方向D1からの平面視において、第1保護層41の平面形状は、基材5と略同じ形状である。第1保護層41は、図示しない接着層を介して基材5の第1主面51に貼付されている。
(2.2.6) First Protective Layer As shown in FIG. 1A, the first protective layer 41 covers the first coil conductor member 61 provided on the first main surface 51 of the substrate 5, and from an external force or the like. The first coil conductor member 61 is protected. The first protective layer 41 is formed in a plate shape or a sheet shape from an electrically insulating material such as a resin. In a plan view from the first direction D1, the planar shape of the first protective layer 41 is substantially the same as that of the base material 5. The 1st protective layer 41 is affixed on the 1st main surface 51 of the base material 5 through the contact bonding layer which is not shown in figure.

(2.2.7)第2保護層
第2保護層42は、図1Aに示すように、基材5の第2主面52に設けられた第2コイル導体部材62を覆い、外力などから第2コイル導体部材62を保護する。第2保護層42は、第1保護層41と同様、樹脂などの電気絶縁材料により板状又はシート状に形成されている。第1方向D1からの平面視において、第2保護層42の平面形状は、基材5と略同じ形状である。第2保護層42は、図示しない接着層を介して基材5の第2主面52に貼付されている。
(2.2.7) Second Protective Layer As shown in FIG. 1A, the second protective layer 42 covers the second coil conductor member 62 provided on the second main surface 52 of the base material 5, and from an external force or the like. The second coil conductor member 62 is protected. Similar to the first protective layer 41, the second protective layer 42 is formed in a plate shape or a sheet shape from an electrically insulating material such as a resin. In a plan view from the first direction D1, the planar shape of the second protective layer 42 is substantially the same as that of the substrate 5. The 2nd protective layer 42 is stuck on the 2nd main surface 52 of the base material 5 via the contact bonding layer which is not shown in figure.

(2.2.8)磁性体
磁性体7は、図1A及び図3に示すように、第1方向D1において第2コイル導体部材62と平面導体3との間に設けられている。磁性体7は、フェライトなどの強磁性材料により四角形の板状又は四角形のシート状に形成されている。磁性体7は、第1主面71と、第2主面72とを有する。磁性体7は、平面導体3、基材5、第1保護層41及び第2保護層42よりも高い透磁率を有する。磁性体7に用いられる強磁性材料としては、例えばNi−Zn−Cu系フェライト又は六方晶系フェライトがある。なお、本実施形態においては、平面導体3の第1主面31、平面導体3の第2主面32、磁性体7の第1主面71、及び磁性体7の第2主面72は、互いに平行である。また、磁性体7の第1主面71及び磁性体7の第2主面72は互いに対面し、磁性体7の第1主面71の法線方向及び磁性体7の第2主面72の法線方向は第1方向D1と一致するか、実質的に一致する。
(2.2.8) Magnetic Material As shown in FIGS. 1A and 3, the magnetic material 7 is provided between the second coil conductor member 62 and the planar conductor 3 in the first direction D1. The magnetic body 7 is formed in a square plate shape or a square sheet shape from a ferromagnetic material such as ferrite. The magnetic body 7 has a first main surface 71 and a second main surface 72. The magnetic body 7 has a higher magnetic permeability than the planar conductor 3, the base material 5, the first protective layer 41, and the second protective layer 42. Examples of the ferromagnetic material used for the magnetic body 7 include Ni—Zn—Cu ferrite and hexagonal ferrite. In the present embodiment, the first main surface 31 of the flat conductor 3, the second main surface 32 of the flat conductor 3, the first main surface 71 of the magnetic body 7, and the second main surface 72 of the magnetic body 7 are: They are parallel to each other. Further, the first main surface 71 of the magnetic body 7 and the second main surface 72 of the magnetic body 7 face each other, the normal direction of the first main surface 71 of the magnetic body 7 and the second main surface 72 of the magnetic body 7. The normal direction coincides with or substantially coincides with the first direction D1.

磁性体7は、第1コイル導体部材61に比べて第2コイル導体部材62に近接する。すなわち、第1コイル導体部材61は、第1方向D1において、磁性体7側ではなく、磁性体7とは反対側に位置し、第2コイル導体部材62は、第1方向D1において、磁性体7側に位置する。磁性体7の第1主面71は、第1方向D1において第2コイル導体部材62と対面し、磁性体7の第2主面72は、第1方向D1において平面導体3の第1主面31と対面する。   The magnetic body 7 is closer to the second coil conductor member 62 than the first coil conductor member 61. That is, the first coil conductor member 61 is located not on the magnetic body 7 side but on the opposite side to the magnetic body 7 in the first direction D1, and the second coil conductor member 62 is disposed on the magnetic body 7 in the first direction D1. Located on the 7th side. The first main surface 71 of the magnetic body 7 faces the second coil conductor member 62 in the first direction D1, and the second main surface 72 of the magnetic body 7 is the first main surface of the planar conductor 3 in the first direction D1. It faces 31.

(3)アンテナ装置の動作
次に、本実施形態に係るアンテナ装置1を備える電子機器8(図8参照)のワイヤレス給電におけるアンテナ装置1の動作について、図1A及び図2を参照して説明する。
(3) Operation of Antenna Device Next, the operation of the antenna device 1 in the wireless power feeding of the electronic device 8 (see FIG. 8) including the antenna device 1 according to the present embodiment will be described with reference to FIGS. 1A and 2. .

まず、アンテナ装置1の第1コイル導体部材61の第1軸に沿った第1方向D1において電子機器8と外部機器(図示せず)とが対向するように、電子機器8と外部機器とを近づける。より詳細には、第1方向D1に外部機器の相手側アンテナ9(図5参照)のコイル導体91(図5参照)の巻回軸が沿うように、電子機器8と外部機器とを近づける。その後、外部機器のコイル導体91に流れる電流により、外部機器の相手側アンテナ9の周囲には、磁束が発生する。そして、外部機器から放射される磁束が電子機器8のコイル導体6を鎖交することにより、電子機器8のコイル導体6には、コイル導体6を鎖交した磁束の変化に応じた大きさの起電力が発生して誘導電流が流れる。これにより、外部機器から電子機器8を給電することができる。   First, the electronic device 8 and the external device are arranged so that the electronic device 8 and the external device (not shown) face each other in the first direction D1 along the first axis of the first coil conductor member 61 of the antenna device 1. Move closer. More specifically, the electronic device 8 and the external device are brought closer to each other so that the winding axis of the coil conductor 91 (see FIG. 5) of the counterpart antenna 9 (see FIG. 5) of the external device is along the first direction D1. Thereafter, a magnetic flux is generated around the counterpart antenna 9 of the external device due to the current flowing through the coil conductor 91 of the external device. And the magnetic flux radiated | emitted from an external apparatus links the coil conductor 6 of the electronic device 8, and the coil conductor 6 of the electronic device 8 has a magnitude | size according to the change of the magnetic flux linked with the coil conductor 6. An electromotive force is generated and an induced current flows. Thereby, the electronic device 8 can be supplied with power from an external device.

(4)効果
以上説明したように、本実施形態に係るコイルアンテナ2では、第3コイル導体部66a,66bの導体線幅W13,W23は、第1コイル導体部64a,64bの導体線幅W11,W21よりも太く、かつ、第2コイル導体部65a,65bの導体線幅W12,W22よりも細い。これにより、導体線幅が一定であるコイル導体に比べて、コイル導体6の抵抗を小さくすることでき、その結果、コイルアンテナ2と相手側アンテナ9との結合度を保ちつつ、コイルアンテナ2のQ値を向上させることができる。
(4) Effect As described above, in the coil antenna 2 according to the present embodiment, the conductor line widths W13 and W23 of the third coil conductor portions 66a and 66b are equal to the conductor line width W11 of the first coil conductor portions 64a and 64b. , W21 and thinner than the conductor line widths W12, W22 of the second coil conductor portions 65a, 65b. As a result, the resistance of the coil conductor 6 can be made smaller than that of the coil conductor having a constant conductor line width. As a result, the degree of coupling between the coil antenna 2 and the counterpart antenna 9 can be maintained, and The Q value can be improved.

また、コイル導体6では、一般的に、外周部に位置するほど線長が伸びるため、内周部と外周部とで導体線幅が一定である場合、外周部のほうが内周部よりも抵抗が大きい。そこで、本実施形態に係るコイルアンテナ2では、外周部である第3コイル導体部66a,66bの導体線幅W13,W23が、内周部である第1コイル導体部64a,64bの導体線幅W11,W21よりも太い。これにより、内周部である第1コイル導体部64a,64bに対する外周部である第3コイル導体部66a,66bの抵抗の増加率を抑制することができる。特にワイヤレス充電の場合、コイル導体6の抵抗を低減させることが望ましい。   In addition, in the coil conductor 6, the wire length generally increases as it is located at the outer peripheral portion. Therefore, when the conductor line width is constant between the inner peripheral portion and the outer peripheral portion, the outer peripheral portion is more resistant than the inner peripheral portion. Is big. Therefore, in the coil antenna 2 according to the present embodiment, the conductor line widths W13 and W23 of the third coil conductor portions 66a and 66b that are the outer peripheral portions are the conductor line widths of the first coil conductor portions 64a and 64b that are the inner peripheral portions. Thicker than W11 and W21. Thereby, the increase rate of the resistance of the 3rd coil conductor parts 66a and 66b which are the outer peripheral parts with respect to the 1st coil conductor parts 64a and 64b which are inner peripheral parts can be suppressed. Particularly in the case of wireless charging, it is desirable to reduce the resistance of the coil conductor 6.

本実施形態に係るコイルアンテナ2によれば、最も細い導体線幅W11,W21よりも線間幅δ1が細いので、線間を通る磁束を低減させることができる。   According to the coil antenna 2 according to the present embodiment, since the line width δ1 is narrower than the narrowest conductor line widths W11 and W21, the magnetic flux passing between the lines can be reduced.

本実施形態に係るコイルアンテナ2では、第1コイル導体部64a,64bが複数回巻かれた状態に設けられている。これにより、コイルアンテナ2と相手側アンテナ9との結合度を更に高めることができる。   In the coil antenna 2 according to the present embodiment, the first coil conductor portions 64a and 64b are provided in a state of being wound a plurality of times. Thereby, the degree of coupling between the coil antenna 2 and the counterpart antenna 9 can be further increased.

本実施形態に係るコイルアンテナ2では、第1コイル導体部64a,64bにおける複数の導体部分の導体線幅w1〜w4がコイル開口60の重心からの距離に関係なく一定である。これにより、第1コイル導体部64a,64bを容易に作成することができる。   In the coil antenna 2 according to the present embodiment, the conductor line widths w1 to w4 of the plurality of conductor portions in the first coil conductor portions 64a and 64b are constant regardless of the distance from the center of gravity of the coil opening 60. Thereby, the 1st coil conductor parts 64a and 64b can be created easily.

本実施形態に係るコイルアンテナ2では、第3コイル導体部66a,66bが複数回巻かれた状態に設けられている。これにより、コイルアンテナ2と相手側アンテナ9との結合度を更に高めることができる。   In the coil antenna 2 according to the present embodiment, the third coil conductor portions 66a and 66b are provided in a state of being wound a plurality of times. Thereby, the degree of coupling between the coil antenna 2 and the counterpart antenna 9 can be further increased.

本実施形態に係るコイルアンテナ2では、第3コイル導体部66a,66bにおける複数の導体部分の導体線幅w9〜w12がコイル開口60の重心から離れるほど細くなる。これにより、コイル導体6の最外周における磁束の方向を水平方向から垂直方向へ容易に変えることができる。   In the coil antenna 2 according to the present embodiment, the conductor line widths w9 to w12 of the plurality of conductor portions in the third coil conductor portions 66a and 66b become thinner as the distance from the center of gravity of the coil opening 60 increases. Thereby, the direction of the magnetic flux in the outermost periphery of the coil conductor 6 can be easily changed from the horizontal direction to the vertical direction.

本実施形態に係るコイルアンテナ2では、第2コイル導体部65a,65bが複数回巻かれた状態に設けられている。これにより、コイルアンテナ2と相手側アンテナ9との結合度を更に高めることができる。   In the coil antenna 2 according to the present embodiment, the second coil conductor portions 65a and 65b are provided in a state of being wound a plurality of times. Thereby, the degree of coupling between the coil antenna 2 and the counterpart antenna 9 can be further increased.

本実施形態に係るコイルアンテナ2によれば、相手側アンテナ9からの磁束が大きい部分に第1コイル導体部64a,64bを位置させることができる。   According to the coil antenna 2 according to the present embodiment, the first coil conductor portions 64a and 64b can be positioned in a portion where the magnetic flux from the counterpart antenna 9 is large.

本実施形態に係るコイルアンテナ2では、第3領域B13,B23内の線間数は、第1領域B11,B21内の線間数よりも少なく、かつ、第2領域B12,B22内の線間数よりも多い。これにより、導体線幅が一定であるコイル導体に比べて、コイル導体6の抵抗を小さくすることができる。その結果、コイルアンテナ2と相手側アンテナ9との結合度を保ちつつ、コイルアンテナ2のQ値を向上させることができる。   In the coil antenna 2 according to the present embodiment, the number of lines in the third regions B13 and B23 is smaller than the number of lines in the first regions B11 and B21, and the number of lines in the second regions B12 and B22. More than the number. Thereby, the resistance of the coil conductor 6 can be made smaller than that of the coil conductor having a constant conductor line width. As a result, the Q value of the coil antenna 2 can be improved while maintaining the degree of coupling between the coil antenna 2 and the counterpart antenna 9.

(5)変形例
以下、本実施形態の変形例について説明する。
(5) Modifications Hereinafter, modifications of the present embodiment will be described.

本実施形態の第1変形例として、図9Aに示すように、第3コイル導体部66a,66bにおいて、コイル開口60の重心とコイル導体6の最外周とを結ぶ直線L11,L12上に位置する複数の導体部分の導体線幅w9〜w12は、コイル開口60の重心からの距離に関係なく一定であってもよい。   As a first modification of the present embodiment, as shown in FIG. 9A, the third coil conductor portions 66a and 66b are located on straight lines L11 and L12 that connect the center of gravity of the coil opening 60 and the outermost periphery of the coil conductor 6. The conductor line widths w9 to w12 of the plurality of conductor portions may be constant regardless of the distance from the center of gravity of the coil opening 60.

第1変形例に係るコイルアンテナ2では、第3コイル導体部66a,66bにおける複数の導体部分の導体線幅w9〜w12がコイル開口60の重心からの距離に関係なく一定である。これにおり、第3コイル導体部66a,66bを容易に作成することができる。   In the coil antenna 2 according to the first modification, the conductor wire widths w9 to w12 of the plurality of conductor portions in the third coil conductor portions 66a and 66b are constant regardless of the distance from the center of gravity of the coil opening 60. Thus, the third coil conductor portions 66a and 66b can be easily formed.

また、第2コイル導体部65a,65bの導体線幅w5〜w8も、第3コイル導体部66a,66bの導体線幅w9〜w12と同様、コイル開口60の重心からの距離に関係なく一定であってもよい。   Also, the conductor line widths w5 to w8 of the second coil conductor portions 65a and 65b are constant regardless of the distance from the center of gravity of the coil opening 60, similarly to the conductor line widths w9 to w12 of the third coil conductor portions 66a and 66b. There may be.

第1変形例では、第1コイル導体部64a,64b、第2コイル導体部65a,65b、及び第3コイル導体部66a,66bの各々において、コイル開口60の重心からの距離に関係なく導体線幅w1〜w12が一定である。ただし、第1コイル導体部64a,64bの導体線幅W11,W21(導体線幅w1〜w4の平均値)と第2コイル導体部65a,65bの導体線幅W12,W22(導体線幅w5〜w8の平均値)と第3コイル導体部66a,66bの導体線幅W13,W23(導体線幅w9〜w12の平均値)はそれぞれ異なっている。第1変形例においても、実施形態1と同様、第3コイル導体部66a,66bの導体線幅W13,W23は、第1コイル導体部64a,64bの導体線幅W11,W12よりも太く、かつ、第2コイル導体部65a,65bの導体線幅W12,W22よりも細い。   In the first modified example, the conductor wires of the first coil conductor portions 64a and 64b, the second coil conductor portions 65a and 65b, and the third coil conductor portions 66a and 66b, regardless of the distance from the center of gravity of the coil opening 60. The widths w1 to w12 are constant. However, the conductor wire widths W11 and W21 (average values of the conductor wire widths w1 to w4) of the first coil conductor portions 64a and 64b and the conductor wire widths W12 and W22 (conductor wire widths w5 to 5 of the second coil conductor portions 65a and 65b). The average value of w8) is different from the conductor line widths W13 and W23 of the third coil conductor portions 66a and 66b (average values of the conductor line widths w9 to w12). Also in the first modification, as in the first embodiment, the conductor line widths W13 and W23 of the third coil conductor portions 66a and 66b are thicker than the conductor line widths W11 and W12 of the first coil conductor portions 64a and 64b, and The conductor coil widths W12 and W22 of the second coil conductor portions 65a and 65b are narrower.

次に、本実施形態の第2変形例として、図9Bに示すように、第1コイル導体部64a,64bの各々において、コイル開口60の重心とコイル導体6の最外周とを結ぶ直線L11,L12上に位置する複数の導体部分の導体線幅w1〜w4は、コイル開口60の重心から離れるほど太くなってもよい。ただし、第2変形例においても、実施形態1と同様、第3コイル導体部66a,66bの導体線幅W13,W23は、第1コイル導体部64a,64bの導体線幅W11,W12よりも太く、かつ、第2コイル導体部65a,65bの導体線幅W12,W22よりも細い。   Next, as a second modification of the present embodiment, as shown in FIG. 9B, in each of the first coil conductor portions 64a and 64b, a straight line L11 connecting the center of gravity of the coil opening 60 and the outermost periphery of the coil conductor 6; The conductor line widths w <b> 1 to w <b> 4 of the plurality of conductor portions positioned on L <b> 12 may be thicker as the distance from the center of gravity of the coil opening 60 increases. However, also in the second modified example, the conductor line widths W13 and W23 of the third coil conductor portions 66a and 66b are thicker than the conductor line widths W11 and W12 of the first coil conductor portions 64a and 64b, as in the first embodiment. In addition, the conductor line widths W12 and W22 of the second coil conductor portions 65a and 65b are narrower.

一般的に、導体線幅が細いほど第1方向D1の磁束が強くなり、導体線幅が太いほど第2方向D2の磁束が強くなる。したがって、第2変形例に係るコイルアンテナ2では、第1コイル導体部64a,64bにおける複数の導体部分の導体線幅w1〜w4がコイル開口60の重心から離れるほど太くなる。これにより、コイル導体6の最内周における磁束の向きを垂直方向から水平方向に徐々に変え、図6で示すループC1のような磁束のループを形成することができる。   Generally, the thinner the conductor line width, the stronger the magnetic flux in the first direction D1, and the thicker the conductor line width, the stronger the magnetic flux in the second direction D2. Therefore, in the coil antenna 2 according to the second modified example, the conductor wire widths w1 to w4 of the plurality of conductor portions in the first coil conductor portions 64a and 64b become thicker as the distance from the center of gravity of the coil opening 60 increases. Thereby, the direction of the magnetic flux in the innermost circumference of the coil conductor 6 is gradually changed from the vertical direction to the horizontal direction, and a magnetic flux loop like the loop C1 shown in FIG. 6 can be formed.

さらに、本実施形態の第3変形例として、図9Cに示すように、第1コイル導体部材61及び第2コイル導体部材62の各々について、導体線幅w1〜w12が徐々に変化していってもよい。より詳細には、1ターン目から6ターン目までは導体線幅w1〜w6が徐々に太くなっていき、7ターン目から12ターン目までは導体線幅w7〜w12が徐々に細くなっていく。第3変形例においても、1ターン目から4ターン目までを第1コイル導体部64a,64bとし、5ターン目から8ターン目までを第2コイル導体部65a,65bとし、9ターン目から12ターン目までを第3コイル導体部66a,66bとすることができる。第3変形例においても、実施形態1と同様、第3コイル導体部66a,66bの導体線幅W13,W23は、第1コイル導体部64a,64bの導体線幅W11,W21よりも太く、かつ、第2コイル導体部65a,65bの導体線幅W12,W22よりも細い。   Further, as a third modification of the present embodiment, as shown in FIG. 9C, the conductor line widths w1 to w12 gradually change for each of the first coil conductor member 61 and the second coil conductor member 62. Also good. More specifically, the conductor line widths w1 to w6 gradually increase from the first turn to the sixth turn, and the conductor line widths w7 to w12 gradually decrease from the seventh turn to the twelfth turn. . Also in the third modification, the first to fourth turns are the first coil conductor portions 64a and 64b, and the fifth to eighth turns are the second coil conductor portions 65a and 65b, and the ninth to 12th turns. The third coil conductor portions 66a and 66b can be used up to the turn. Also in the third modification, as in the first embodiment, the conductor line widths W13 and W23 of the third coil conductor portions 66a and 66b are thicker than the conductor line widths W11 and W21 of the first coil conductor portions 64a and 64b, and The conductor coil widths W12 and W22 of the second coil conductor portions 65a and 65b are narrower.

また、本実施形態の第4変形例として、図9Dに示すように、コイル導体6が3回しか巻かれていない状態に設けられており、第1コイル導体部64a,64b、第2コイル導体部65a,65b、及び第3コイル導体部66a,66bがそれぞれ1回しか巻かれていない状態に設けられていてもよい。この場合、第1コイル導体部64a,64bの導体線幅W11,W21は、1ターン目の導体線幅w1であり、第2コイル導体部65a,65bの導体線幅W12,W22は、2ターン目の導体線幅w2であり、第3コイル導体部66a,66bの導体線幅W13,W23は、3ターン目の導体線幅w3であり。第4変形例においても、実施形態1と同様、第3コイル導体部66a,66bの導体線幅W13,W23は、第1コイル導体部64aの導体線幅W11,W21よりも太く、かつ、第2コイル導体部65a,65bの導体線幅W12,W22よりも細い。   Further, as a fourth modification of the present embodiment, as shown in FIG. 9D, the coil conductor 6 is provided in a state where it is wound only three times, and the first coil conductor portions 64a and 64b, the second coil conductor are provided. The portions 65a and 65b and the third coil conductor portions 66a and 66b may be provided in a state where they are wound only once. In this case, the conductor wire widths W11 and W21 of the first coil conductor portions 64a and 64b are the conductor wire width w1 of the first turn, and the conductor wire widths W12 and W22 of the second coil conductor portions 65a and 65b are 2 turns. The conductor line width w2 of the eye and the conductor line widths W13 and W23 of the third coil conductor portions 66a and 66b are the conductor line width w3 of the third turn. Also in the fourth modified example, as in the first embodiment, the conductor line widths W13 and W23 of the third coil conductor portions 66a and 66b are thicker than the conductor line widths W11 and W21 of the first coil conductor portion 64a, and It is narrower than the conductor line widths W12 and W22 of the two-coil conductor portions 65a and 65b.

本実施形態の第5変形例に係るアンテナ装置1aでは、図10に示すように、コイルアンテナ2aのコイル導体6aは、第1コイル導体部材61及び第2コイル導体部材62の2層構造には限定されず、1層構造であってもよい。つまり、第5変形例に係るコイルアンテナ2aのコイル導体6aは、実施形態1に係るコイルアンテナ2における第1コイル導体部材61及び第2コイル導体部材62のうちいずれか一方しか備えていない。   In the antenna device 1a according to the fifth modification of the present embodiment, as shown in FIG. 10, the coil conductor 6a of the coil antenna 2a has a two-layer structure of a first coil conductor member 61 and a second coil conductor member 62. It is not limited, A single layer structure may be sufficient. That is, the coil conductor 6a of the coil antenna 2a according to the fifth modification includes only one of the first coil conductor member 61 and the second coil conductor member 62 in the coil antenna 2 according to the first embodiment.

コイルアンテナ2aは、基材5と、コイル導体6aと、磁性体7と、保護層43とを備える。コイル導体6aは、第1コイル導体部67と、第2コイル導体部68と、第3コイル導体部69とを備える。コイル導体6aは、コイル開口60aを有する。   The coil antenna 2 a includes a base material 5, a coil conductor 6 a, a magnetic body 7, and a protective layer 43. The coil conductor 6 a includes a first coil conductor portion 67, a second coil conductor portion 68, and a third coil conductor portion 69. The coil conductor 6a has a coil opening 60a.

第5変形例においても、実施形態1と同様、コイル開口60aの重心とコイル導体6aの最外周とを結ぶ直線L2上において、第3コイル導体部69の導体線幅W33は、第1コイル導体部67の導体線幅W31よりも太く、かつ、第2コイル導体部68の導体線幅W32よりも細い。   Also in the fifth modification, as in the first embodiment, the conductor line width W33 of the third coil conductor portion 69 is the first coil conductor on the straight line L2 connecting the center of gravity of the coil opening 60a and the outermost periphery of the coil conductor 6a. It is thicker than the conductor line width W31 of the portion 67 and thinner than the conductor line width W32 of the second coil conductor portion 68.

また、コイルアンテナ2のコイル導体6が2層構造である場合、第1コイル導体部材61及び第2コイル導体部材62の両方において、第3コイル導体部66a,66bの導体線幅W13,W23が、第1コイル導体部64a,64bの導体線幅W11,W21よりも太く、かつ、第2コイル導体部65a,65bの導体線幅W12,W22よりも細いという条件を満たしていることには限定されない。第1コイル導体部材61及び第2コイル導体部材62のいずれか一方において、上記条件を満たしていてもよい。要するに、コイル導体6が2層構造である場合、第1コイル導体部材61及び第2コイル導体部材62の少なくとも一方において、上記条件を満たしていればよい。   Further, when the coil conductor 6 of the coil antenna 2 has a two-layer structure, the conductor line widths W13 and W23 of the third coil conductor portions 66a and 66b are the same in both the first coil conductor member 61 and the second coil conductor member 62. It is limited to satisfying the condition that the conductor wire widths W11 and W21 of the first coil conductor portions 64a and 64b are larger than the conductor wire widths W12 and W22 of the second coil conductor portions 65a and 65b. Not. Any one of the first coil conductor member 61 and the second coil conductor member 62 may satisfy the above condition. In short, when the coil conductor 6 has a two-layer structure, it is sufficient that at least one of the first coil conductor member 61 and the second coil conductor member 62 satisfies the above condition.

一方、コイルアンテナ2のコイル導体6は、3層以上の構造であってもよい。コイル導体6が3層以上の構造であっても、3つ以上のコイル導体部材の全てにおいて、第3コイル導体部の導体線幅が、第1コイル導体部の導体線幅よりも太く、かつ、第2コイル導体部の導体線幅よりも細いという条件を満たしている。あるいは、3つ以上のコイル導体部材のうちの1つ又は2つにおいて、上記条件を満たしていてもよい。要するに、コイル導体6が3層以上の構造である場合、3つ以上のコイル導体部材の少なくとも1つにおいて、上記条件を満たしていればよい。   On the other hand, the coil conductor 6 of the coil antenna 2 may have a structure of three or more layers. Even if the coil conductor 6 has a structure of three or more layers, the conductor line width of the third coil conductor part is larger than the conductor line width of the first coil conductor part in all of the three or more coil conductor members, and The condition that it is narrower than the conductor line width of the second coil conductor portion is satisfied. Alternatively, one or two of the three or more coil conductor members may satisfy the above condition. In short, when the coil conductor 6 has a structure of three or more layers, it is sufficient that at least one of the three or more coil conductor members satisfies the above condition.

また、コイル導体6が複数層構造(2層構造を含む)である場合、コイル導体部材ごとに、上記条件を満たしていればよい。   Further, when the coil conductor 6 has a multi-layer structure (including a two-layer structure), it is only necessary to satisfy the above conditions for each coil conductor member.

また、本実施形態の変形例として、コイルアンテナ2は、磁性体7を備えなくてもよい。つまり、磁性体7は必須の構成ではない。   Further, as a modification of the present embodiment, the coil antenna 2 may not include the magnetic body 7. That is, the magnetic body 7 is not an essential configuration.

アンテナ装置1の用途は、ワイヤレス給電(ワイヤレス充電を含む)には限定されない。アンテナ装置1は、NFC(Near Field Communication)のような近距離無線通信のために用いられてもよい。   The application of the antenna device 1 is not limited to wireless power feeding (including wireless charging). The antenna device 1 may be used for near field communication such as NFC (Near Field Communication).

アンテナ装置1は、複数のコイルアンテナを備えてもよい。つまり、アンテナ装置1は、いわゆるコンボアンテナを備えてもよい。複数のコイルアンテナとしては、例えば、異なる規格の給電方式のアンテナがある。具体的には、アンテナ装置1は、複数のコイルアンテナとして、Qi用のアンテナとA4WP用のアンテナとの両方を備えてもよい。   The antenna device 1 may include a plurality of coil antennas. That is, the antenna device 1 may include a so-called combo antenna. As the plurality of coil antennas, for example, there are power feeding type antennas of different standards. Specifically, the antenna device 1 may include both a Qi antenna and an A4WP antenna as a plurality of coil antennas.

また、アンテナ装置1が複数のコイルアンテナを備える場合、複数のコイルアンテナの全てが、第3コイル導体部の導体線幅が第1コイル導体部の導体線幅よりも太く、かつ、第2コイル導体部の導体線幅よりも細いという条件を満たしていてもよいし、複数のコイルアンテナのうちの一部のコイルアンテナが上記条件を満たしていてもよい。要するに、複数のコイルアンテナのうち少なくとも1つが上記条件を満たしていればよい。   Further, when the antenna device 1 includes a plurality of coil antennas, all of the plurality of coil antennas have a conductor wire width of the third coil conductor portion larger than that of the first coil conductor portion, and the second coil. The condition that it is narrower than the conductor line width of the conductor portion may be satisfied, or some of the coil antennas among the plurality of coil antennas may satisfy the above condition. In short, it is sufficient that at least one of the plurality of coil antennas satisfies the above condition.

平面導体3は、二次電池の金属ケースには限定されず、電子機器8(図8参照)の筐体の金属部分であってもよく、電子機器8内に搭載されているグランド基板やシールドボックス、又はディスプレイのバックメタル等の各種金属部材であってもよい。   The planar conductor 3 is not limited to the metal case of the secondary battery, and may be a metal portion of the housing of the electronic device 8 (see FIG. 8). The ground conductor or shield mounted in the electronic device 8 may be used. Various metal members such as a box or a back metal of a display may be used.

また、本実施形態の変形例として、コイルアンテナ2は、平面導体3を備えなくてもよい。つまり、平面導体3は必須の構成ではない。   Further, as a modification of the present embodiment, the coil antenna 2 may not include the planar conductor 3. That is, the planar conductor 3 is not an essential configuration.

コイルアンテナ2の形状は、四角形状には限定されない。コイルアンテナ2は、第1方向D1からの平面視で、円状に形成されていてもよい。あるいは、コイルアンテナ2は、四角形以外の多角形状に形成されていてもよい。   The shape of the coil antenna 2 is not limited to a square shape. The coil antenna 2 may be formed in a circular shape in plan view from the first direction D1. Alternatively, the coil antenna 2 may be formed in a polygonal shape other than a quadrangle.

さらに、第1コイル導体部材61のループ数(巻回数)は12回には限定されない。第1コイル導体部材61は、11回以下に巻かれた状態に設けられていてもよいし、13回以上巻かれた状態に設けられていてもよい。   Further, the number of loops (number of turns) of the first coil conductor member 61 is not limited to twelve. The 1st coil conductor member 61 may be provided in the state wound 11 times or less, and may be provided in the state wound 13 times or more.

同様に、第2コイル導体部材62のループ数(巻回数)も12回には限定されない。第2コイル導体部材62は、11回以下に巻かれた状態に設けられていてもよいし、13回以上巻かれた状態に設けられていてもよい。   Similarly, the number of loops (number of turns) of the second coil conductor member 62 is not limited to twelve. The 2nd coil conductor member 62 may be provided in the state wound 11 times or less, and may be provided in the state wound 13 times or more.

また、コイルアンテナ2は、樹脂などの電気絶縁材料により形成されている基材5に代えて、例えば磁性材料により形成されている基材を備えてもよい。基材が磁性材料により形成されている場合においても、コイル導体6は、磁性材料の基材に直接形成される。また、基材が磁性材料で形成されている場合、基材と磁性体7とを兼用することができる。これにより、コイルアンテナ2の第1方向D1の厚みを低減させることができる。   In addition, the coil antenna 2 may include a base material formed of, for example, a magnetic material instead of the base material 5 formed of an electrically insulating material such as resin. Even when the base material is formed of a magnetic material, the coil conductor 6 is directly formed on the base material of the magnetic material. Moreover, when a base material is formed with the magnetic material, a base material and the magnetic body 7 can be combined. Thereby, the thickness of the coil antenna 2 in the first direction D1 can be reduced.

上記の各変形例に係るアンテナ装置1においても、本実施形態に係るアンテナ装置1と同様の効果を奏する。   The antenna device 1 according to each of the above modifications also has the same effect as the antenna device 1 according to the present embodiment.

以上説明した実施形態及び変形例は、本発明の様々な実施形態及び変形例の一部に過ぎない。また、実施形態及び変形例は、本発明の目的を達成できれば、設計等に応じて種々の変更が可能である。   The embodiments and modifications described above are only a part of the various embodiments and modifications of the present invention. In addition, the embodiment and the modification can be variously changed according to the design or the like as long as the object of the present invention can be achieved.

(まとめ)
以上説明した実施形態から以下の態様が開示されていることが明らかである。
(Summary)
From the embodiment described above, it is apparent that the following aspects are disclosed.

第1の態様に係るコイルアンテナ(2;2a)は、コイル導体(6;6a)を備える。コイル導体(6;6a)は、巻回軸の周りに巻き回され、コイル開口(60;60a)を有する。コイル導体(6;6a)は、第1コイル導体部(64a;64b;67)と、第2コイル導体部(65a;65b;68)と、第3コイル導体部(66a;66b;69)とを備える。第1コイル導体部(64a;64b;67)は、少なくとも1回巻かれた状態に設けられている。第2コイル導体部(65a;65b;68)は、少なくとも1回巻かれた状態であり、第1コイル導体部(64a;64b;67)に比べてコイル開口(60;60a)から離れて設けられている。第3コイル導体部(66a;66b;69)は、少なくとも1回巻かれた状態であり、第2コイル導体部(65a;65b;68)に比べてコイル開口(60;60a)から離れて設けられている。第3コイル導体部(66a;66b;69)の導体線幅(W13;W23;W33)は、第1コイル導体部(64a;64b;67)の導体線幅(W11;W21;W31)よりも太く、かつ、第2コイル導体部(65a;65b;68)の導体線幅(W12;W22;W32)よりも細い。   The coil antenna (2; 2a) according to the first aspect includes a coil conductor (6; 6a). The coil conductor (6; 6a) is wound around a winding axis and has a coil opening (60; 60a). The coil conductor (6; 6a) includes a first coil conductor portion (64a; 64b; 67), a second coil conductor portion (65a; 65b; 68), and a third coil conductor portion (66a; 66b; 69). Is provided. The first coil conductor portions (64a; 64b; 67) are provided in a state of being wound at least once. The second coil conductor portion (65a; 65b; 68) is wound at least once, and is provided farther from the coil opening (60; 60a) than the first coil conductor portion (64a; 64b; 67). It has been. The third coil conductor portion (66a; 66b; 69) is in a state of being wound at least once, and is provided farther from the coil opening (60; 60a) than the second coil conductor portion (65a; 65b; 68). It has been. The conductor line width (W13; W23; W33) of the third coil conductor part (66a; 66b; 69) is larger than the conductor line width (W11; W21; W31) of the first coil conductor part (64a; 64b; 67). It is thicker and narrower than the conductor line width (W12; W22; W32) of the second coil conductor portion (65a; 65b; 68).

第1の態様に係るコイルアンテナ(2;2a)では、第3コイル導体部(66a;66b;69)の導体線幅(W13;W23;W33)は、第1コイル導体部(64a;64b;67)の導体線幅(W11;W21;W31)よりも太く、かつ、第2コイル導体部(65a;65b;68)の導体線幅(W12;W22;W32)よりも細い。これにより、導体線幅が一定であるコイル導体に比べて、コイル導体(6;6a)の抵抗を小さくすることでき、その結果、コイルアンテナ(2;2a)と相手側アンテナ(9)との結合度を保ちつつ、コイルアンテナ(2;2a)のQ値を向上させることができる。   In the coil antenna (2; 2a) according to the first aspect, the conductor line width (W13; W23; W33) of the third coil conductor portion (66a; 66b; 69) is the first coil conductor portion (64a; 64b; 67) which is thicker than the conductor line width (W11; W21; W31) and thinner than the conductor line width (W12; W22; W32) of the second coil conductor part (65a; 65b; 68). As a result, the resistance of the coil conductor (6; 6a) can be reduced as compared with the coil conductor having a constant conductor line width. As a result, the coil antenna (2; 2a) and the counterpart antenna (9) can be reduced. The Q value of the coil antenna (2; 2a) can be improved while maintaining the degree of coupling.

第2の態様に係るコイルアンテナ(2;2a)では、第1の態様において、第1コイル導体部(64a;64b;67)、第2コイル導体部(65a;65b;68)、及び第3コイル導体部(66a;66b;69)における複数の線間幅(δ1)は、それぞれ、第1コイル導体部(64a;64b;67)の導体線幅(W11;W21;W31)よりも細い。   In the coil antenna (2; 2a) according to the second aspect, in the first aspect, the first coil conductor part (64a; 64b; 67), the second coil conductor part (65a; 65b; 68), and the third The plurality of line widths (δ1) in the coil conductor portions (66a; 66b; 69) are narrower than the conductor wire widths (W11; W21; W31) of the first coil conductor portions (64a; 64b; 67), respectively.

第2の態様に係るコイルアンテナ(2;2a)によれば、最も細い導体線幅(W11;W21;W31)よりも線間幅(δ1)が細いので、線間を通る磁束を低減させることができる。   According to the coil antenna (2; 2a) according to the second aspect, since the line width (δ1) is narrower than the narrowest conductor line width (W11; W21; W31), the magnetic flux passing between the lines can be reduced. Can do.

第3の態様に係るコイルアンテナ(2;2a)では、第1又は2の態様において、第1コイル導体部(64a;64b;67)は、複数回巻かれた状態に設けられている。   In the coil antenna (2; 2a) according to the third aspect, in the first or second aspect, the first coil conductor portion (64a; 64b; 67) is provided in a state of being wound a plurality of times.

第3の態様に係るコイルアンテナ(2;2a)では、第1コイル導体部(64a;64b;67)が複数回巻かれた状態に設けられている。これにより、コイルアンテナ(2;2a)と相手側アンテナ(9)との結合度を更に高めることができる。   In the coil antenna (2; 2a) according to the third aspect, the first coil conductor (64a; 64b; 67) is provided in a state of being wound a plurality of times. Thereby, the degree of coupling between the coil antenna (2; 2a) and the counterpart antenna (9) can be further increased.

第4の態様に係るコイルアンテナ(2;2a)は、第3の態様を引用し、第1コイル導体部(64a;64b;67)において、コイル開口(60;60a)の重心とコイル導体(6;6a)の最外周とを結ぶ直線(L11;L12;L2)上に位置する複数の導体部分の導体線幅(w1〜w4)は、コイル開口(60;60a)の重心から離れるほど太くなる。   The coil antenna (2; 2a) according to the fourth aspect refers to the third aspect. In the first coil conductor portion (64a; 64b; 67), the center of gravity of the coil opening (60; 60a) and the coil conductor ( 6; 6a) The conductor line widths (w1 to w4) of the plurality of conductor portions located on the straight line (L11; L12; L2) connecting with the outermost periphery are thicker as they are separated from the center of gravity of the coil opening (60; 60a). Become.

第4の態様に係るコイルアンテナ(2;2a)では、第1コイル導体部(64a;64b;67)における複数の導体部分の導体線幅(w1〜w4)がコイル開口(60;60a)の重心から離れるほど太くなる。これにより、コイル導体(6;6a)の最内周における磁束の向きを垂直方向から水平方向に徐々に変えることができる。   In the coil antenna (2; 2a) according to the fourth aspect, the conductor wire widths (w1 to w4) of the plurality of conductor portions in the first coil conductor portion (64a; 64b; 67) are the coil openings (60; 60a). The thicker the distance from the center of gravity. Thereby, the direction of the magnetic flux in the innermost circumference of the coil conductor (6; 6a) can be gradually changed from the vertical direction to the horizontal direction.

第5の態様に係るコイルアンテナ(2;2a)は、第3の態様を引用し、第1コイル導体部(64a;64b;67)において、コイル開口(60;60a)の重心とコイル導体(6;6a)の最外周とを結ぶ直線(L11;L12;L2)上に位置する複数の導体部分の導体線幅(w1〜w4)は、コイル開口(60;60a)の重心からの距離に関係なく一定である。   The coil antenna (2; 2a) according to the fifth aspect refers to the third aspect. In the first coil conductor portion (64a; 64b; 67), the center of gravity of the coil opening (60; 60a) and the coil conductor ( The conductor line widths (w1 to w4) of the plurality of conductor portions located on the straight line (L11; L12; L2) connecting the outermost periphery of 6; 6a) are the distances from the center of gravity of the coil opening (60; 60a). Regardless.

第5の態様に係るコイルアンテナ(2;2a)では、第1コイル導体部(64a;64b;67)における複数の導体部分の導体線幅(w1〜w4)がコイル開口(60;60a)の重心からの距離に関係なく一定である。これにより、第1コイル導体部(64a;64b;67)を容易に作成することができる。   In the coil antenna (2; 2a) according to the fifth aspect, the conductor line widths (w1 to w4) of the plurality of conductor portions in the first coil conductor portion (64a; 64b; 67) are the coil openings (60; 60a). It is constant regardless of the distance from the center of gravity. Thereby, a 1st coil conductor part (64a; 64b; 67) can be produced easily.

第6の態様に係るコイルアンテナ(2;2a)では、第1〜5の態様のいずれか1つにおいて、第3コイル導体部(66a;66b;69)は、複数回巻かれた状態に設けられている。   In the coil antenna (2; 2a) according to the sixth aspect, in any one of the first to fifth aspects, the third coil conductor portion (66a; 66b; 69) is provided in a state of being wound a plurality of times. It has been.

第6の態様に係るコイルアンテナ(2;2a)では、第3コイル導体部(66a;66b;69)が複数回巻かれた状態に設けられている。これにより、コイルアンテナ(2;2a)と相手側アンテナ(9)との結合度を更に高めることができる。   In the coil antenna (2; 2a) according to the sixth aspect, the third coil conductor (66a; 66b; 69) is provided in a state of being wound a plurality of times. Thereby, the degree of coupling between the coil antenna (2; 2a) and the counterpart antenna (9) can be further increased.

第7の態様に係るコイルアンテナ(2;2a)は、第6の態様を引用し、第3コイル導体部(66a;66b;69)において、コイル開口(60;60a)の重心とコイル導体(6;6a)の最外周とを結ぶ直線(L11;L12;L2)上に位置する複数の導体部分の導体線幅(w9〜w12)は、コイル開口(60;60a)の重心から離れるほど細くなる。   The coil antenna (2; 2a) according to the seventh aspect refers to the sixth aspect. In the third coil conductor portion (66a; 66b; 69), the center of gravity of the coil opening (60; 60a) and the coil conductor ( 6; 6a) The conductor line widths (w9 to w12) of the plurality of conductor portions located on the straight line (L11; L12; L2) connecting to the outermost periphery are so narrow that they are separated from the center of gravity of the coil opening (60; 60a). Become.

第7の態様に係るコイルアンテナ(2;2a)では、第3コイル導体部(66a;66b;69)における複数の導体部分の導体線幅(w9〜w12)がコイル開口(60;60a)の重心から離れるほど細くなる。これにより、コイル導体(6;6a)の最外周における磁束の方向を水平方向から垂直方向へ容易に変えることができる。   In the coil antenna (2; 2a) according to the seventh aspect, the conductor line widths (w9 to w12) of the plurality of conductor portions in the third coil conductor portion (66a; 66b; 69) are the coil openings (60; 60a). The thinner you get from the center of gravity. Thereby, the direction of the magnetic flux in the outermost periphery of the coil conductor (6; 6a) can be easily changed from the horizontal direction to the vertical direction.

第8の態様に係るコイルアンテナ(2;2a)は、第6の態様を引用し、第3コイル導体部(66a;66b;69)において、コイル開口(60;60a)の重心とコイル導体(6;6a)の最外周とを結ぶ直線(L11;L12;L2)上に位置する複数の導体部分の導体線幅(w9〜w12)は、コイル開口(60;60a)の重心からの距離に関係なく一定である。   The coil antenna (2; 2a) according to the eighth aspect refers to the sixth aspect. In the third coil conductor portion (66a; 66b; 69), the center of gravity of the coil opening (60; 60a) and the coil conductor ( The conductor line widths (w9 to w12) of the plurality of conductor portions located on the straight line (L11; L12; L2) connecting the outermost circumference of 6; 6a) are the distance from the center of gravity of the coil opening (60; 60a). Regardless.

第8の態様に係るコイルアンテナ(2;2a)では、第3コイル導体部(66a;66b;69)における複数の導体部分の導体線幅(w9〜w12)がコイル開口(60;60a)の重心からの距離に関係なく一定である。これにおり、第3コイル導体部(66a;66b;69)を容易に作成することができる。   In the coil antenna (2; 2a) according to the eighth aspect, the conductor line widths (w9 to w12) of the plurality of conductor portions in the third coil conductor portion (66a; 66b; 69) are the coil openings (60; 60a). It is constant regardless of the distance from the center of gravity. Thus, the third coil conductor portion (66a; 66b; 69) can be easily created.

第9の態様に係るコイルアンテナ(2;2a)では、第1〜8の態様のいずれか1つにおいて、第2コイル導体部(65a;65b;68)は、複数回巻かれた状態に設けられている。   In the coil antenna (2; 2a) according to the ninth aspect, in any one of the first to eighth aspects, the second coil conductor portion (65a; 65b; 68) is provided in a state of being wound a plurality of times. It has been.

第9の態様に係るコイルアンテナ(2;2a)では、第2コイル導体部(65a;65b;68)が複数回巻かれた状態に設けられている。これにより、コイルアンテナ(2;2a)と相手側アンテナ(9)との結合度を更に高めることができる。   In the coil antenna (2; 2a) according to the ninth aspect, the second coil conductor portion (65a; 65b; 68) is provided in a state of being wound a plurality of times. Thereby, the degree of coupling between the coil antenna (2; 2a) and the counterpart antenna (9) can be further increased.

第10の態様に係るコイルアンテナ(2;2a)では、第3〜9の態様のいずれか1つにおいて、第1コイル導体部(64a;64b;67)の領域幅(A3)は、相手側アンテナ(9)におけるコイル導体(91)のコイル開口(92)の開口幅(A2)とコイル開口(60;60a)の開口幅(A1)との差の2分の1以下である。   In the coil antenna (2; 2a) according to the tenth aspect, in any one of the third to ninth aspects, the area width (A3) of the first coil conductor portion (64a; 64b; 67) is It is less than or equal to one half of the difference between the opening width (A2) of the coil opening (92) of the coil conductor (91) and the opening width (A1) of the coil opening (60; 60a) in the antenna (9).

第10の態様に係るコイルアンテナ(2;2a)によれば、相手側アンテナ(9)からの磁束が大きい部分に第1コイル導体部(64a;64b;67)を位置させることができる。   According to the coil antenna (2; 2a) according to the tenth aspect, the first coil conductor portion (64a; 64b; 67) can be positioned in a portion where the magnetic flux from the counterpart antenna (9) is large.

第11の態様に係るコイルアンテナ(2;2a)は、コイル導体(6;6a)を備える。コイル導体(60;60a)は、巻回軸の周りに巻き回され、コイル開口(60;60a)を有する。コイル導体(6;6a)は、第1領域(B11;B21)、第2領域(B12;B22)、及び第3領域(B13;B23)を有する。第1領域(B11;B21)、第2領域(B12;B22)、及び第3領域(B13;B23)は、コイル開口(60;60a)の重心とコイル導体(6;6a)の最外周とを結ぶ直線(L11;L12;L2)上において、コイル導体(6;6a)の最内周とコイル導体(6;6a)の最外周との間の長さを3等分して得られる。第1領域(B11;B21)は、第2領域(B12;B22)に比べてコイル開口(60;60a)の重心に近接する。第2領域(B12;B22)は、第3領域(B13;B23)に比べてコイル開口(60;60a)の重心に近接する。第3領域(B13;B23)内の直線(L11;L12;L2)上における線間数は、第1領域(B11;B21)内の直線(L11;L12;L2)上における線間数よりも少なく、かつ、第2領域(B12;B22)内の直線(L11;L12;L2)上における線間数よりも多い。   The coil antenna (2; 2a) according to the eleventh aspect includes a coil conductor (6; 6a). The coil conductor (60; 60a) is wound around a winding axis and has a coil opening (60; 60a). The coil conductor (6; 6a) has a first region (B11; B21), a second region (B12; B22), and a third region (B13; B23). The first region (B11; B21), the second region (B12; B22), and the third region (B13; B23) are the center of gravity of the coil opening (60; 60a) and the outermost periphery of the coil conductor (6; 6a). Is obtained by dividing the length between the innermost circumference of the coil conductor (6; 6a) and the outermost circumference of the coil conductor (6; 6a) into three equal parts on a straight line (L11; L12; L2). The first region (B11; B21) is closer to the center of gravity of the coil opening (60; 60a) than the second region (B12; B22). The second region (B12; B22) is closer to the center of gravity of the coil opening (60; 60a) than the third region (B13; B23). The number of lines on the straight line (L11; L12; L2) in the third region (B13; B23) is larger than the number of lines on the straight line (L11; L12; L2) in the first region (B11; B21). The number is less than the number of lines on the straight line (L11; L12; L2) in the second region (B12; B22).

第11の態様に係るコイルアンテナ(2;2a)では、第3領域(B13;B23)内の線間数は、第1領域(B11;B21)内の線間数よりも少なく、かつ、第2領域(B12;B22)内の線間数よりも多い。これにより、導体線幅が一定であるコイル導体に比べて、コイル導体(6;6a)の抵抗を小さくすることができる。その結果、コイルアンテナ(2;2a)と相手側アンテナ(9)との結合度を保ちつつ、コイルアンテナ(2;2a)のQ値を向上させることができる。   In the coil antenna (2; 2a) according to the eleventh aspect, the number of lines in the third region (B13; B23) is smaller than the number of lines in the first region (B11; B21), and More than the number of lines in the two regions (B12; B22). Thereby, the resistance of the coil conductor (6; 6a) can be reduced as compared with the coil conductor having a constant conductor line width. As a result, the Q factor of the coil antenna (2; 2a) can be improved while maintaining the degree of coupling between the coil antenna (2; 2a) and the counterpart antenna (9).

第12の態様に係るコイルアンテナ(2;2a)は、第1〜11の態様のいずれか1つにおいて、磁界結合によるワイヤレス給電に用いられる。   The coil antenna (2; 2a) according to the twelfth aspect is used for wireless power feeding by magnetic field coupling in any one of the first to eleventh aspects.

第13の態様に係る電子機器(8)は、第1〜12の態様のいずれか1つのコイルアンテナ(2;2a)と、制御部(81)とを備える。制御部(81)は、コイルアンテナ(2;2a)が受信又は送信する信号を制御する。   An electronic apparatus (8) according to a thirteenth aspect includes any one of the coil antennas (2; 2a) according to the first to twelfth aspects and a control unit (81). A control part (81) controls the signal which a coil antenna (2; 2a) receives or transmits.

第13の態様に係る電子機器(8)によれば、導体線幅が一定であるコイル導体に比べて、コイル導体(6;6a)の抵抗を小さくすることができる。その結果、コイルアンテナ(2;2a)と相手側アンテナ(9)との結合度を保ちつつ、コイルアンテナ(2;2a)のQ値を向上させることができる。   According to the electronic device (8) according to the thirteenth aspect, the resistance of the coil conductor (6; 6a) can be made smaller than that of the coil conductor having a constant conductor line width. As a result, the Q factor of the coil antenna (2; 2a) can be improved while maintaining the degree of coupling between the coil antenna (2; 2a) and the counterpart antenna (9).

2,2a コイルアンテナ
6,6a コイル導体
60,60a コイル開口
64a,64b,67 第1コイル導体部
65a,65b,68 第2コイル導体部
66a,66b,69 第3コイル導体部
8 電子機器
81 制御部
9 相手側アンテナ
91 コイル導体
92 コイル開口
W11,W21,W31 導体線幅
W12,W22,W32 導体線幅
W13,W23,W33 導体線幅
w1〜w12 導体線幅
δ1 線間幅
A1,A2 開口幅
A3 領域幅
B11,B21 第1領域
B12,B22 第2領域
B13,B23 第3領域
C1 磁束のループ
L11,L12,L2 直線
2, 2a coil antenna 6, 6a coil conductor 60, 60a coil opening 64a, 64b, 67 first coil conductor portion 65a, 65b, 68 second coil conductor portion 66a, 66b, 69 third coil conductor portion 8 electronic device 81 control Part 9 Mating antenna 91 Coil conductor 92 Coil opening W11, W21, W31 Conductor line width W12, W22, W32 Conductor line width W13, W23, W33 Conductor line width w1 to w12 Conductor line width δ1 Line width A1, A2 Opening width A3 area width B11, B21 1st area B12, B22 2nd area B13, B23 3rd area C1 loop of magnetic flux L11, L12, L2 straight line

Claims (13)

巻回軸の周りに巻き回され、コイル開口を有するコイル導体を備え、
前記コイル導体は、
少なくとも1回巻かれた状態に設けられている第1コイル導体部と、
少なくとも1回巻かれた状態であり、前記第1コイル導体部に比べて前記コイル開口から離れて設けられている第2コイル導体部と、
少なくとも1回巻かれた状態であり、前記第2コイル導体部に比べて前記コイル開口から離れて設けられている第3コイル導体部と、を備え、
前記第3コイル導体部の導体線幅は、前記第1コイル導体部の導体線幅よりも太く、かつ、前記第2コイル導体部の導体線幅よりも細い
ことを特徴とするコイルアンテナ。
Comprising a coil conductor wound around a winding axis and having a coil opening;
The coil conductor is
A first coil conductor provided in a state wound at least once;
A second coil conductor portion that is wound at least once and is provided farther from the coil opening than the first coil conductor portion;
A third coil conductor portion that is wound at least once and is provided farther from the coil opening than the second coil conductor portion,
The coil antenna, wherein a conductor line width of the third coil conductor part is larger than a conductor line width of the first coil conductor part and is thinner than a conductor line width of the second coil conductor part.
前記第1コイル導体部、前記第2コイル導体部、及び前記第3コイル導体部における複数の線間幅は、それぞれ、前記第1コイル導体部の前記導体線幅よりも細い
ことを特徴とする請求項1に記載のコイルアンテナ。
A plurality of line widths in the first coil conductor part, the second coil conductor part, and the third coil conductor part are each smaller than the conductor line width of the first coil conductor part. The coil antenna according to claim 1.
前記第1コイル導体部は、複数回巻かれた状態に設けられている
ことを特徴とする請求項1又は2に記載のコイルアンテナ。
The coil antenna according to claim 1 or 2, wherein the first coil conductor portion is provided in a state of being wound a plurality of times.
前記第1コイル導体部において、前記コイル開口の重心と前記コイル導体の最外周とを結ぶ直線上に位置する複数の導体部分の導体線幅は、前記コイル開口の前記重心から離れるほど太くなる
ことを特徴とする請求項3に記載のコイルアンテナ。
In the first coil conductor portion, the conductor line width of a plurality of conductor portions located on a straight line connecting the center of gravity of the coil opening and the outermost periphery of the coil conductor becomes thicker as the distance from the center of gravity of the coil opening increases. The coil antenna according to claim 3.
前記第1コイル導体部において、前記コイル開口の重心と前記コイル導体の最外周とを結ぶ直線上に位置する複数の導体部分の導体線幅は、前記コイル開口の前記重心からの距離に関係なく一定である
ことを特徴とする請求項3に記載のコイルアンテナ。
In the first coil conductor portion, the conductor wire widths of the plurality of conductor portions located on a straight line connecting the center of gravity of the coil opening and the outermost periphery of the coil conductor are independent of the distance from the center of gravity of the coil opening. The coil antenna according to claim 3, wherein the coil antenna is constant.
前記第3コイル導体部は、複数回巻かれた状態に設けられている
ことを特徴とする請求項1〜5のいずれか1項に記載のコイルアンテナ。
The coil antenna according to any one of claims 1 to 5, wherein the third coil conductor portion is provided in a state of being wound a plurality of times.
前記第3コイル導体部において、前記コイル開口の重心と前記コイル導体の最外周とを結ぶ直線上に位置する複数の導体部分の導体線幅は、前記コイル開口の前記重心から離れるほど細くなる
ことを特徴とする請求項6に記載のコイルアンテナ。
In the third coil conductor portion, the conductor line widths of the plurality of conductor portions located on a straight line connecting the center of gravity of the coil opening and the outermost periphery of the coil conductor become narrower as the distance from the center of gravity of the coil opening increases. The coil antenna according to claim 6.
前記第3コイル導体部において、前記コイル開口の重心と前記コイル導体の最外周とを結ぶ直線上に位置する複数の導体部分の導体線幅は、前記コイル開口の前記重心からの距離に関係なく一定である
ことを特徴とする請求項6に記載のコイルアンテナ。
In the third coil conductor portion, the conductor line width of the plurality of conductor portions located on a straight line connecting the center of gravity of the coil opening and the outermost periphery of the coil conductor is independent of the distance from the center of gravity of the coil opening. The coil antenna according to claim 6, wherein the coil antenna is constant.
前記第2コイル導体部は、複数回巻かれた状態に設けられている
ことを特徴とする請求項1〜8のいずれか1項に記載のコイルアンテナ。
The coil antenna according to any one of claims 1 to 8, wherein the second coil conductor portion is provided in a state of being wound a plurality of times.
前記第1コイル導体部の領域幅は、相手側アンテナにおけるコイル導体のコイル開口の開口幅と前記コイル開口の開口幅との差の2分の1以下である
ことを特徴とする請求項3〜9のいずれか1項に記載のコイルアンテナ。
The region width of the first coil conductor portion is less than or equal to one half of the difference between the opening width of the coil opening of the coil conductor and the opening width of the coil opening in the counterpart antenna. 10. The coil antenna according to any one of 9 above.
巻回軸の周りに巻き回され、コイル開口を有するコイル導体を備え、
前記コイル導体は、前記コイル開口の重心と前記コイル導体の最外周とを結ぶ直線上において、前記コイル導体の最内周と前記コイル導体の前記最外周との間の長さを3等分して得られる第1領域、第2領域、及び第3領域を有し、
前記第1領域は、前記第2領域に比べて前記コイル開口の前記重心に近接し、
前記第2領域は、前記第3領域に比べて前記コイル開口の前記重心に近接し、
前記第3領域内の前記直線上における線間数は、前記第1領域内の前記直線上における線間数よりも少なく、かつ、前記第2領域内の前記直線上における線間数よりも多い
ことを特徴とするコイルアンテナ。
Comprising a coil conductor wound around a winding axis and having a coil opening;
The coil conductor divides the length between the innermost circumference of the coil conductor and the outermost circumference of the coil conductor into three equal parts on a straight line connecting the center of gravity of the coil opening and the outermost circumference of the coil conductor. A first region, a second region, and a third region obtained by
The first region is closer to the center of gravity of the coil opening than the second region,
The second region is closer to the center of gravity of the coil opening than the third region,
The number of lines on the straight line in the third region is smaller than the number of lines on the straight line in the first region, and more than the number of lines on the straight line in the second region. A coil antenna characterized by that.
磁界結合によるワイヤレス給電に用いられる
ことを特徴とする請求項1〜11のいずれか1項に記載のコイルアンテナ。
The coil antenna according to claim 1, wherein the coil antenna is used for wireless power feeding by magnetic field coupling.
請求項1〜12のいずれか1項に記載のコイルアンテナと、
前記コイルアンテナが受信又は送信する信号を制御する制御部と、を備える
ことを特徴とする電子機器。
A coil antenna according to any one of claims 1 to 12,
An electronic device comprising: a control unit that controls a signal received or transmitted by the coil antenna.
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