WO2016129620A1 - Antenna device and electronic device - Google Patents

Antenna device and electronic device Download PDF

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Publication number
WO2016129620A1
WO2016129620A1 PCT/JP2016/053895 JP2016053895W WO2016129620A1 WO 2016129620 A1 WO2016129620 A1 WO 2016129620A1 JP 2016053895 W JP2016053895 W JP 2016053895W WO 2016129620 A1 WO2016129620 A1 WO 2016129620A1
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Prior art keywords
antenna
conductor
opening
coil
antenna device
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PCT/JP2016/053895
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French (fr)
Japanese (ja)
Inventor
天野信之
山口真介
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株式会社村田製作所
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Priority to JP2016574825A priority Critical patent/JPWO2016129620A1/en
Publication of WO2016129620A1 publication Critical patent/WO2016129620A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop

Definitions

  • the present invention relates to an antenna device, and more particularly to an antenna device having a coil antenna.
  • the present invention also relates to an electronic apparatus, and more particularly to an electronic apparatus including an antenna device having a coil antenna.
  • Patent Document 1 discloses a coil antenna having a conductor pattern in which a magnetic core is wound around in a helical shape.
  • a magnetic core is constituted by a magnetic layer
  • a coil is constituted by a linear conductor portion formed along the main surface of the magnetic layer, and the whole is constituted as a surface mount type chip component. . Therefore, this type of coil antenna is mounted on a circuit board included in a communication device that is an assembly destination.
  • a metal casing may be used for communication equipment in consideration of improvement in strength and design of communication equipment.
  • a conductor such as a metal housing
  • an eddy current in a direction that prevents the change of magnetic flux flows through the conductor. That is, the electromagnetic field is shielded and communication is disabled.
  • An object of the present invention is to provide an antenna device capable of communication and an electronic apparatus including the antenna device while having a structure in which a coil antenna is surrounded by a conductor such as a metal casing.
  • An antenna device of the present invention includes a coil antenna having a helically wound coil conductor, and a conductor surrounding the coil antenna,
  • the conductor has a first opening, a second opening, and a side surface;
  • the inside of the coil antenna having a substantially axial direction as the winding axis direction of the coil conductor has a hollow cylindrical shape, and the conductor has a slit extending in the axial direction from the first opening on the side surface. It is characterized by that.
  • the position of the coil antenna is offset in the direction of the first opening with respect to the center of the conductor in the axial direction. This increases the magnetic flux density in the vicinity of the first opening of the conductor and improves the communication characteristics in the first opening direction. Further, since the path of the magnetic flux entering and exiting the coil antenna is asymmetric between the first opening direction and the second opening direction from the center of the conductor, communication on the slit forming surface of the conductor is also possible.
  • the slit further extends in the direction of the second opening from the position of the coil antenna in plan view. This effectively suppresses eddy currents that hinder changes in the magnetic flux of the coil antenna.
  • the slit communicates from the first opening to the second opening. This more effectively suppresses eddy currents that hinder changes in the magnetic flux of the coil antenna.
  • the conductor is, for example, a housing that accommodates a circuit or member other than the coil antenna therein.
  • the metal housing since the metal housing is provided, it can be integrated into an electronic device excellent in strength and design.
  • An electronic device of the present invention includes the antenna device according to any one of (1) to (5) above and a power feeding circuit connected to the coil antenna. With this configuration, it is possible to obtain an electronic device capable of communication using an internal coil antenna while the casing is made of metal.
  • an antenna device capable of communication and an electronic device including the antenna device can be obtained while having a structure in which a coil antenna is surrounded by a conductor such as a metal casing.
  • FIG. 1 is a perspective view of an antenna device 101 according to the first embodiment.
  • FIG. 2 is a plan view of the antenna device 101.
  • FIG. 3 is an exploded perspective view showing the internal configuration of the coil antenna 2.
  • FIG. 4A is a diagram illustrating an eddy current flowing through the cylindrical conductor 1 included in the antenna device 101.
  • FIG. 4B is a diagram illustrating an eddy current flowing through the cylindrical conductor 1P included in the antenna device of the comparative example.
  • FIG. 5A is a diagram illustrating a state of coupling between the antenna device 101 and the communication partner antenna 3.
  • FIG. 5B is a diagram showing a state of coupling between the antenna device of the comparative example and the communication partner side antenna 3.
  • FIG. 6A and 6B are perspective views of the antenna devices 102A and 102B according to the second embodiment.
  • FIG. 7 is a plan view of an antenna device 102C according to the second embodiment.
  • FIG. 8 is a plan view of an antenna device 103A according to the third embodiment.
  • FIG. 9 is a perspective view of another antenna device 103B according to the third embodiment.
  • FIG. 10 is a front view of the electronic apparatus 201.
  • the “antenna device” is an antenna that radiates magnetic flux.
  • the antenna device is an antenna used for near-field communication using magnetic field coupling with an antenna on the communication partner side, and is used for communication such as NFC (Near field communication).
  • the antenna device is used, for example, in the HF band, particularly at a frequency near 13.56 MHz or 13.56 MHz.
  • the size of the antenna device is sufficiently smaller than the wavelength ⁇ at the used frequency, and the radiation characteristics of the electromagnetic wave are poor in the used frequency band.
  • the size of the antenna device is ⁇ / 10 or less.
  • the wavelength here refers to the effective wavelength which considered the wavelength shortening effect by the dielectric property of the base material in which an antenna is formed, or magnetic permeability. Both ends of the coil conductor included in the coil antenna are connected to a power feeding circuit that operates a used frequency band (HF band, particularly around 13.56 MHz).
  • FIG. 1 is a perspective view of an antenna device 101 according to the first embodiment.
  • FIG. 2 is a plan view of the antenna device 101.
  • the conductor 1 of the antenna device 101 includes a coil antenna 2 and a cylindrical conductor 1 surrounding the coil antenna 2.
  • the coil antenna 2 is a chip-shaped coil antenna having a coil conductor wound in a helical shape.
  • a broken line in FIG. 1 represents a winding axis AX-AX of the coil conductor.
  • the winding axis AX-AX of the coil conductor faces the Y-axis direction.
  • the cylindrical conductor 1 has a first opening 11, a second opening 12, and a side surface in which the winding axis AX-AX direction of the coil conductor of the coil antenna 2 is a substantial axial direction, and the inside is a hollow cylindrical shape (In this example, a rectangular tube shape).
  • the surface of the first opening 11 and the surface of the second opening 12 are each parallel to the XZ plane.
  • the cylindrical conductor 1 is an example of the “conductor” according to the present invention.
  • a slit 1S extending in the axial direction from the first opening 11 to the second opening 12 is provided on the side surface of the cylindrical conductor 1.
  • the gap of the slit 1S is, for example, 0.1 mm.
  • the cylindrical conductor 1 is a bent body of a metal plate such as stainless steel, magnesium, or aluminum.
  • the coil antenna 2 is positioned with respect to the center of the cylindrical conductor 1 in the axial direction, that is, with respect to the center of the cylindrical conductor 1 (point O in FIG. 2) in plan view. It is offset in the direction of one opening 11.
  • the coil antenna 2 is disposed substantially at the center in both the height direction (Z-axis direction) and the left-right width direction (X-axis direction) of the first opening 11 of the cylindrical conductor 1. Note that the coil antenna 2 does not have to be disposed substantially in the center in either the height direction of the first opening 11 of the cylindrical conductor 1 or the width direction of the left and right sides. It may be offset in the width direction.
  • FIG. 3 is an exploded perspective view showing the internal configuration of the coil antenna 2.
  • the coil antenna 2 includes base material layers 20a, 20b, 20c, 20d, and 20e, and a conductor pattern formed on a predetermined base material layer among these base material layers.
  • the base material layers 20b, 20c, and 20d are magnetic layers, and the base material layers 20a and 20e are nonmagnetic layers.
  • the magnetic layer acts as a magnetic core of the coil antenna.
  • a plurality of coil conductors 23 are formed on the upper surface of the base material layer 20b, and a plurality of coil conductors 24 are formed on the upper surface of the base material layer 20e.
  • Interlayer connection conductors (via conductors) 25 that connect the coil conductors 23 and 24 to each other are formed on the base material layers 20b, 20c, and 20d.
  • Mounting electrodes 21, 22, and 27 are formed on the lower surface of the base material layer 20e.
  • the ends of the coil conductors 23 at both ends in the arrangement direction of the plurality of coil conductors 23 are connected to the mounting electrodes 21 and 22 via the interlayer connection conductor 26, respectively.
  • the coil antenna 2 is configured as a surface-mounted chip component.
  • the size of the coil antenna 2 is, for example, 5.7 mm ⁇ 2.8 mm ⁇ 0.9 mm.
  • FIG. 4A is a diagram showing eddy currents flowing through the cylindrical conductor 1 provided in the antenna device 101 of the present embodiment.
  • FIG. 4B is a diagram illustrating an eddy current flowing through the cylindrical conductor 1P included in the antenna device of the comparative example. Both are views seen from the first opening 11 of the cylindrical conductor.
  • the dot symbol of the coil antenna 2 indicates the direction of the magnetic flux generated in the coil antenna 2.
  • the slit 1S As shown in FIG. 4 (B), if the slit 1S is not formed in the cylindrical conductor 1, the magnetic flux passing through the coil antenna 2 causes the cylindrical conductor 1P to move as shown by an arrow in FIG. 4 (B). Eddy current flows.
  • the slit 1S is formed in the conductor 1, so that the eddy current does not flow, the electromagnetic field shielding by the cylindrical conductor 1 is suppressed, and the communication partner antenna and Communication by magnetic field coupling becomes possible.
  • the antenna device of the comparative example in which the coil antenna is surrounded by the cylindrical conductor in which the slit 1S is not formed is compared with the antenna device 101 of the present embodiment.
  • the communication partner antenna is a coil antenna with a diameter of 70 mm, the distance from the center of the communication partner antenna to the first opening 11 of the cylindrical conductor 1 is 10 mm, and the distance from the center of the communication partner antenna to the coil antenna 2 is 11.5 mm.
  • the coupling coefficient between the antenna device of this comparative example and the communication partner antenna is only 0.0025, and is hardly coupled.
  • the coupling coefficient between the antenna device 101 of this embodiment and the communication partner antenna is 0.0150. Further, since the coupling coefficient of the coil antenna 2 alone without the cylindrical conductor 1 is 0.0157, there is almost no decrease in the coupling coefficient due to the provision of the cylindrical conductor 1.
  • FIG. 5A is a diagram showing a state of coupling between the antenna device 101 of the present embodiment and the communication partner side antenna 3.
  • FIG. 5B is a diagram showing a state of coupling between the antenna device of the comparative example and the communication partner side antenna 3. In both cases, the broken lines indicate magnetic flux. In addition, two positional relationships of the communication partner antenna 3 with respect to the antenna device are also illustrated.
  • the coil antenna 2 is arranged at the center of the cylindrical conductor 1. Therefore, the magnetic flux entering and exiting the first opening 11, the second opening 12, and the slit 1S is symmetric when viewed in the direction shown in the figure. Therefore, in a state where the communication partner antenna 3 is close along the slit 1S, the magnetic flux does not substantially interlink with the communication partner antenna 3, and communication is impossible.
  • the coil antenna 2 is offset toward the first opening 11 of the cylindrical conductor 1, so that the first opening 11
  • the coil antenna 2 and the communication partner antenna are most strongly magnetically coupled in a state where the communication partner antenna 3 is close. Further, even when the communication partner side antenna 3 is close along the slit 1S, the communication partner side antenna 3 is linked to the magnetic flux, and communication is possible.
  • 6A and 6B are perspective views of the antenna devices 102A and 102B according to the second embodiment.
  • the formation position of the slit 1S is different from the antenna device 101 shown in FIG. 1 in the first embodiment.
  • Other configurations are the same as those of the antenna device 101 of the first embodiment.
  • a slit 1S is formed at one ridge.
  • a slit 1 ⁇ / b> S is formed on the side surface of the cylindrical conductor 1.
  • the slit 1S blocks eddy current that tends to flow through the conductor 1. Therefore, similarly to the antenna device 101 of the first embodiment, electromagnetic field shielding by the cylindrical conductor 1 is suppressed, and communication is possible.
  • FIG. 7 is a plan view of the antenna device 102C according to the second embodiment.
  • the slit 1S of the cylindrical conductor 1 has an opening 1A in the middle thereof.
  • An operation unit 7 such as a push button switch is exposed in the opening 1A.
  • a part of the slit 1S may also serve as an exposed portion of a desired member.
  • the operation unit it may also serve as a device such as an opening for a camera lens, a detection unit for various sensors, a microphone, and a speaker.
  • FIG. 8 is a plan view of an antenna device 103A according to the third embodiment.
  • the shape of the slit 1S is different from the antenna device 101 shown in FIG. 1 in the first embodiment.
  • a slit 1S extending from the first opening 11 toward the second opening 12 (in the axial direction of the cylindrical conductor 1) is formed in the cylindrical conductor 1.
  • the slit 1S does not reach the second opening 12 and ends in the middle.
  • the slit 1 ⁇ / b> S is further extended by L from the position of the coil antenna 2 in the direction of the second opening 12.
  • the slit 1S does not necessarily need to communicate from the first opening 11 to the second opening 12.
  • the magnetic flux density is higher as it is closer to the coil antenna 2. That is, the magnetic flux density distribution is concentrated around the coil antenna 2. For this reason, the eddy current flowing in the position of the cylindrical conductor 1 away from the coil antenna 2 is small.
  • the coupling coefficient between the antenna device 103A and the communication partner antenna is 0.0106. Since the coupling coefficient of the antenna device 101 in which the slit 1S is connected from the first opening 11 to the second opening 12 shown in the first embodiment is 0.0150, there is no significant decrease in the coupling coefficient.
  • FIG. 9 is a perspective view of another antenna device 103B according to the third embodiment.
  • the shape of the cylindrical conductor 1 is different from the antenna device 101 shown in FIG. 1 in the first embodiment.
  • the area of the second opening 12 of the cylindrical conductor 1 is smaller than the area of the first opening 11.
  • the slit 1 ⁇ / b> S communicates from the first opening 11 to the second opening 12.
  • the substantial opening area of the cylindrical conductor 1 may be narrowed. Since the magnetic flux passes through the narrowed opening (second opening 12 in the example of FIG. 9), the phenomenon that an eddy current that hinders the change in the magnetic flux of the coil antenna 2 flows to the cylindrical conductor is suppressed.
  • the first opening and the second opening may be configured as slits having substantially the same width as the slits.
  • FIG. 10 is a front view of the electronic apparatus 201.
  • This electronic apparatus 201 uses the cylindrical conductor 1 of the antenna device 101 shown in FIG. 1 in the first embodiment as a casing. Therefore, the overall shape of the electronic apparatus 201 is the same as that of the antenna device 101 shown in FIG.
  • a circuit board 4 is housed inside the cylindrical conductor (metal casing) 1.
  • a coil antenna 2 is mounted on the upper surface of the circuit board 4.
  • a Micro ⁇ USB connector 5 is mounted on the lower surface of the circuit board 4.
  • a battery 6 as a power source is disposed on the circuit board 4.
  • an RFIC connected to the coil antenna 2 and a resonance frequency setting chip capacitor are mounted on the circuit board 4.
  • RFIC is used in HF band RFID systems such as NFC and FeliCa (registered trademark).
  • the RFIC and the resonance frequency setting chip capacitor are examples of the “feed circuit” according to the present invention.
  • the circuit board 4 is further provided with a communication circuit for performing communication by Bluetooth (registered trademark).
  • a resin member is provided between the circuit board 4 and the battery 6 on which various components are mounted and the inner surface of the cylindrical conductor 1, and the circuit board 4 and the battery 6 pass through the resin member with respect to the cylindrical conductor 1. Buffered.
  • the electronic device 201 performs communication by NFC using the coil antenna 2.
  • the electronic device 201 is a headset controller that receives digital audio data by Bluetooth (registered trademark), for example, and performs pairing of Bluetooth (registered trademark) using NFC.
  • the connector 5 is used for charging the battery 6.
  • cylindrical conductor 1 as a metal casing of the electronic device 201, it is possible to reduce the size by using a thin casing and to improve the design.
  • Examples of electronic devices include mobile phones such as smartphones and feature phones, wearable terminals such as smart watches and smart glasses, notebook PCs, tablet terminals, cameras, game machines, and toys.
  • the shape of the cylindrical conductor is not limited to a rectangular tube shape, but can be similarly applied to a cylindrical shape, an elliptical cylindrical shape, a polygonal cylindrical shape, and the like.
  • the slit is not limited to a straight line, and may be non-parallel to the axial direction of the cylinder. Further, the slit may be curved instead of linear. The slit may be bent in the middle. There may be a plurality of slits. There may be a plurality of coil antennas.
  • the antenna device and the electronic device in the communication system mainly using magnetic field coupling such as NFC have been described.
  • the antenna device and the electronic device in the above-described embodiment are contactless using magnetic field coupling.
  • the power transmission system (electromagnetic induction method, magnetic field resonance method) can be used similarly.
  • the antenna device in the above-described embodiment is used as a power receiving antenna device for a power receiving device of a magnetic resonance type non-contact power transmission system used in the HF band, particularly in the vicinity of 6.78 MHz or 6.78 MHz, and transmits power to the power transmitting device. It can be applied as an antenna device. Even in this case, the antenna device functions as a power receiving antenna device or a power transmitting antenna device.
  • both ends of the coil conductor included in the coil antenna of the antenna device are connected to a power reception circuit or a power transmission circuit that operates a use frequency band (HF band, particularly around 6.78 MHz).
  • AX ... winding axis O ... center point 1 ... cylindrical conductor (conductor) DESCRIPTION OF SYMBOLS 1A ... Opening part 1P ; Cylindrical conductor 1S ... Slit 2 ... Coil antenna 3 ... Communication partner side antenna 4 ... Circuit board 5 ... Connector 6 ... Battery 7 ... Operation part 11 ... 1st opening 12 ... 2nd opening 20a, 20b, 20c, 20d, 20e ... substrate layers 21, 22, 27 ... mounting electrodes 23, 24 ... coil conductor 26 ... interlayer connection conductors 101, 101A, 102A, 102B, 102C, 103A, 103B ... antenna device 201 ... electronic equipment

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  • Near-Field Transmission Systems (AREA)

Abstract

An antenna device (101), provided with: a coil antenna (2) having a coil conductor shaped so as to be wound in a helical shape; and a cylindrical conductor (1) enclosing the coil antenna (2). The cylindrical conductor (1) has a cylindrical shape having a first opening (11) and a second opening (12) with the axial direction essentially being the direction of a winding axis AX-AX of the coil conductor of the coil antenna (2), and also has a slit (1S) extending in the axial direction from the first opening (11) of the cylinder shape. An antenna device structured so that the surroundings of a coil antenna is enclosed by a metal casing or another conductor is thus formed.

Description

アンテナ装置および電子機器ANTENNA DEVICE AND ELECTRONIC DEVICE
　本発明は、アンテナ装置に関し、特に、コイルアンテナを有するアンテナ装置に関する。また、本発明は電子機器に関し、特にコイルアンテナを有するアンテナ装置を備えた電子機器に関する。 The present invention relates to an antenna device, and more particularly to an antenna device having a coil antenna. The present invention also relates to an electronic apparatus, and more particularly to an electronic apparatus including an antenna device having a coil antenna.
　磁性体コアの周囲をヘリカル状に巻回した形状の導体パターンを備えたコイルアンテナが特許文献１に示されている。 Patent Document 1 discloses a coil antenna having a conductor pattern in which a magnetic core is wound around in a helical shape.
　このようなコイルアンテナは、磁性層で磁性体コアが構成され、磁性層の主面に沿って形成された線状導体部でコイルが構成され、全体は表面実装型のチップ部品として構成される。したがって、この種のコイルアンテナは、組み込み先である通信機器が有する回路基板に実装される。 In such a coil antenna, a magnetic core is constituted by a magnetic layer, a coil is constituted by a linear conductor portion formed along the main surface of the magnetic layer, and the whole is constituted as a surface mount type chip component. . Therefore, this type of coil antenna is mounted on a circuit board included in a communication device that is an assembly destination.
国際公開第２０１３／１６８５５８号International Publication No. 2013/168558
　上記コイルアンテナの実装構造は簡素であるので、実装上の自由度は高く、近年様々な機器に組み込まれるようになっている。 Since the mounting structure of the coil antenna is simple, the degree of freedom in mounting is high, and in recent years it has been incorporated into various devices.
　一方、通信機器の強度向上やデザイン性向上を考慮して、通信機器に金属筐体が用いられることがある。ところが、コイルアンテナの周囲が金属筐体等の導体で囲まれると、その導体に、磁束の変化を妨げる方向の渦電流が流れる。すなわち、電磁界が遮蔽されて通信不能となる。 On the other hand, a metal casing may be used for communication equipment in consideration of improvement in strength and design of communication equipment. However, when the periphery of the coil antenna is surrounded by a conductor such as a metal housing, an eddy current in a direction that prevents the change of magnetic flux flows through the conductor. That is, the electromagnetic field is shielded and communication is disabled.
　本発明の目的は、コイルアンテナの周囲が金属筐体等の導体で囲まれる構造でありながら、通信を可能としたアンテナ装置およびそれを備える電子機器を提供することにある。 An object of the present invention is to provide an antenna device capable of communication and an electronic apparatus including the antenna device while having a structure in which a coil antenna is surrounded by a conductor such as a metal casing.
（１）本発明のアンテナ装置は、ヘリカル状に巻回された形状のコイル導体を有するコイルアンテナと、前記コイルアンテナを囲む導体と、を備え、
　前記導体は、第１開口、第２開口および側面を有し、
前記コイルアンテナの前記コイル導体の巻回軸方向を実質的な軸方向とする内部が空洞の筒状をなし、前記導体は、前記側面に前記第１開口から前記軸方向に延伸するスリットを有することを特徴とする。 (1) An antenna device of the present invention includes a coil antenna having a helically wound coil conductor, and a conductor surrounding the coil antenna,
The conductor has a first opening, a second opening, and a side surface;
The inside of the coil antenna having a substantially axial direction as the winding axis direction of the coil conductor has a hollow cylindrical shape, and the conductor has a slit extending in the axial direction from the first opening on the side surface. It is characterized by that.
　上記構成により、コイルアンテナから発生する磁束が上記導体に鎖交しても、導体を周回しようとする電流経路はスリットで分断されるので、コイルアンテナの磁束の変化を妨げる渦電流は上記導体に流れにくい。その結果、導体による電磁界遮蔽が抑制され、通信が可能となる。 With the above configuration, even if the magnetic flux generated from the coil antenna is interlinked with the conductor, the current path that attempts to circulate the conductor is divided by the slit, so that the eddy current that prevents the coil antenna from changing the magnetic flux is applied to the conductor. Difficult to flow. As a result, electromagnetic field shielding by the conductor is suppressed, and communication becomes possible.
（２）上記（１）において、前記コイルアンテナの位置は、前記導体の前記軸方向における中心に対して前記第１開口の方向へオフセットしていることが好ましい。このことにより、導体の第１開口付近の磁束密度が高まり、第１開口方向での通信特性が良好となる。また、コイルアンテナを出入りする磁束の経路は導体の中心から第１開口方向と第２開口方向とで非対称となるので、導体のスリット形成面での通信も可能となる。 (2) In the above (1), it is preferable that the position of the coil antenna is offset in the direction of the first opening with respect to the center of the conductor in the axial direction. This increases the magnetic flux density in the vicinity of the first opening of the conductor and improves the communication characteristics in the first opening direction. Further, since the path of the magnetic flux entering and exiting the coil antenna is asymmetric between the first opening direction and the second opening direction from the center of the conductor, communication on the slit forming surface of the conductor is also possible.
（３）上記（１）または（２）において、平面視で、前記スリットは前記コイルアンテナの位置より前記第２開口の方向へ更に延伸していることが好ましい。このことにより、コイルアンテナの磁束の変化を妨げる渦電流が効果的に抑制される。 (3) In the above (1) or (2), it is preferable that the slit further extends in the direction of the second opening from the position of the coil antenna in plan view. This effectively suppresses eddy currents that hinder changes in the magnetic flux of the coil antenna.
（４）上記（１）から（３）のいずれかにおいて、前記スリットは前記第１開口から前記第２開口まで連通していることが好ましい。このことにより、コイルアンテナの磁束の変化を妨げる渦電流がより効果的に抑制される。 (4) In any one of (1) to (3), it is preferable that the slit communicates from the first opening to the second opening. This more effectively suppresses eddy currents that hinder changes in the magnetic flux of the coil antenna.
（５）上記（１）から（４）のいずれかにおいて、前記導体は、例えば、内部に前記コイルアンテナ以外の回路または部材を収納する筐体である。この構成であれば、金属筐体を備えるので、強度面およびデザイン面で優れた電子機器に一体的に組み込むことができる。 (5) In any one of the above (1) to (4), the conductor is, for example, a housing that accommodates a circuit or member other than the coil antenna therein. With this configuration, since the metal housing is provided, it can be integrated into an electronic device excellent in strength and design.
（６）本発明の電子機器は、上記（１）から（５）のいずれかに記載のアンテナ装置と、前記コイルアンテナに接続される給電回路とを備える。この構成により、筐体が金属でありながらも、内部のコイルアンテナを用いた通信が可能な電子機器が得られる。 (6) An electronic device of the present invention includes the antenna device according to any one of (1) to (5) above and a power feeding circuit connected to the coil antenna. With this configuration, it is possible to obtain an electronic device capable of communication using an internal coil antenna while the casing is made of metal.
　本発明によれば、コイルアンテナの周囲が金属筐体等の導体で囲まれる構造でありながら、通信を可能としたアンテナ装置およびそれを備える電子機器が得られる。 According to the present invention, an antenna device capable of communication and an electronic device including the antenna device can be obtained while having a structure in which a coil antenna is surrounded by a conductor such as a metal casing.
図１は第１の実施形態に係るアンテナ装置１０１の斜視図である。FIG. 1 is a perspective view of an antenna device 101 according to the first embodiment. 図２はアンテナ装置１０１の平面図である。FIG. 2 is a plan view of the antenna device 101. 図３はコイルアンテナ２の内部の構成を示す分解斜視図である。FIG. 3 is an exploded perspective view showing the internal configuration of the coil antenna 2. 図４（Ａ）はアンテナ装置１０１が備える筒状導体１に流れる渦電流について示す図である。図４（Ｂ）は比較例のアンテナ装置が備える筒状導体１Ｐに流れる渦電流について示す図である。FIG. 4A is a diagram illustrating an eddy current flowing through the cylindrical conductor 1 included in the antenna device 101. FIG. 4B is a diagram illustrating an eddy current flowing through the cylindrical conductor 1P included in the antenna device of the comparative example. 図５（Ａ）はアンテナ装置１０１と通信相手側アンテナ３との結合の様子を示す図である。図５（Ｂ）は比較例のアンテナ装置と通信相手側アンテナ３との結合の様子を示す図である。FIG. 5A is a diagram illustrating a state of coupling between the antenna device 101 and the communication partner antenna 3. FIG. 5B is a diagram showing a state of coupling between the antenna device of the comparative example and the communication partner side antenna 3. 図６（Ａ）（Ｂ）は第２の実施形態に係るアンテナ装置１０２Ａ、１０２Ｂの斜視図である。6A and 6B are perspective views of the antenna devices 102A and 102B according to the second embodiment. 図７は第２の実施形態に係るアンテナ装置１０２Ｃの平面図である。FIG. 7 is a plan view of an antenna device 102C according to the second embodiment. 図８は第３の実施形態に係るアンテナ装置１０３Ａの平面図である。FIG. 8 is a plan view of an antenna device 103A according to the third embodiment. 図９は第３の実施形態に係る別のアンテナ装置１０３Ｂの斜視図である。FIG. 9 is a perspective view of another antenna device 103B according to the third embodiment. 図１０は電子機器２０１の正面図である。FIG. 10 is a front view of the electronic apparatus 201.
　以降、図を参照して幾つかの具体的な例を挙げて、本発明を実施するための複数の形態を示す。各図中には同一箇所に同一符号を付す。第２の実施形態以降では第１の実施形態と共通の事柄についての記述を省略し、異なる点について説明する。特に、同様の構成による同様の作用効果については実施形態毎には逐次言及しない。 Hereinafter, several specific examples will be given with reference to the drawings to show a plurality of modes for carrying out the present invention. In the drawings, the same reference numerals are given to the same portions. In the second and subsequent embodiments, description of matters common to the first embodiment is omitted, and different points will be described. In particular, the same operation effect by the same configuration will not be sequentially described for each embodiment.
　以降に示す各実施形態において、「アンテナ装置」とは、磁束を放射するアンテナである。アンテナ装置は、通信相手側のアンテナと磁界結合を用いた近傍界通信のために用いられるアンテナであり、例えばＮＦＣ（Near field communication）等の通信に利用される。アンテナ装置は、例えばＨＦ帯、特に13.56MHzまたは13.56MHz近傍の周波数で用いられる。アンテナ装置の大きさは使用する周波数における波長λに比べて十分に小さく、使用周波数帯においては電磁波の放射特性は悪い。アンテナ装置の大きさはλ/10以下である。なお、ここでいう波長とは、アンテナが形成される基材の誘電性や透磁性による波長短縮効果を考慮した実効的な波長の事を指す。コイルアンテナが有するコイル導体の両端は、使用周波数帯（ＨＦ帯、特に13.56MHz近傍）を操作する給電回路に接続される。 In the following embodiments, the “antenna device” is an antenna that radiates magnetic flux. The antenna device is an antenna used for near-field communication using magnetic field coupling with an antenna on the communication partner side, and is used for communication such as NFC (Near field communication). The antenna device is used, for example, in the HF band, particularly at a frequency near 13.56 MHz or 13.56 MHz. The size of the antenna device is sufficiently smaller than the wavelength λ at the used frequency, and the radiation characteristics of the electromagnetic wave are poor in the used frequency band. The size of the antenna device is λ / 10 or less. In addition, the wavelength here refers to the effective wavelength which considered the wavelength shortening effect by the dielectric property of the base material in which an antenna is formed, or magnetic permeability. Both ends of the coil conductor included in the coil antenna are connected to a power feeding circuit that operates a used frequency band (HF band, particularly around 13.56 MHz).
《第１の実施形態》
　図１は第１の実施形態に係るアンテナ装置１０１の斜視図である。図２はアンテナ装置１０１の平面図である。アンテナ装置１０１の導体１はコイルアンテナ２とこのコイルアンテナ２を囲む筒状導体１とを備える。コイルアンテナ２はヘリカル状に巻回されたコイル導体を有するチップ状のコイルアンテナである。図１中の破線はコイル導体の巻回軸ＡＸ－ＡＸを表している。コイル導体の巻回軸ＡＸ－ＡＸはＹ軸方向を向く。 << First Embodiment >>
FIG. 1 is a perspective view of an antenna device 101 according to the first embodiment. FIG. 2 is a plan view of the antenna device 101. The conductor 1 of the antenna device 101 includes a coil antenna 2 and a cylindrical conductor 1 surrounding the coil antenna 2. The coil antenna 2 is a chip-shaped coil antenna having a coil conductor wound in a helical shape. A broken line in FIG. 1 represents a winding axis AX-AX of the coil conductor. The winding axis AX-AX of the coil conductor faces the Y-axis direction.
　筒状導体１は、コイルアンテナ２のコイル導体の巻回軸ＡＸ－ＡＸ方向を実質的な軸方向とする、第１開口１１、第２開口１２および側面を有し、内部が空洞の筒状（この例では角筒状）を成す。図１に示す例では、第１開口１１の面および第２開口１２の面はそれぞれＸ－Ｚ面に平行な面である。この筒状導体１は本発明に係る「導体」の一例である。 The cylindrical conductor 1 has a first opening 11, a second opening 12, and a side surface in which the winding axis AX-AX direction of the coil conductor of the coil antenna 2 is a substantial axial direction, and the inside is a hollow cylindrical shape (In this example, a rectangular tube shape). In the example shown in FIG. 1, the surface of the first opening 11 and the surface of the second opening 12 are each parallel to the XZ plane. The cylindrical conductor 1 is an example of the “conductor” according to the present invention.
　筒状導体１の側面には、第１開口１１から第２開口１２まで軸方向に延伸するスリット１Ｓを備える。スリット１Ｓの間隙は例えば0.1mmである。この筒状導体１は、例えばステンレススチール、マグネシウム、アルミニウム等の金属板の折り曲げ成形体である。 A slit 1S extending in the axial direction from the first opening 11 to the second opening 12 is provided on the side surface of the cylindrical conductor 1. The gap of the slit 1S is, for example, 0.1 mm. The cylindrical conductor 1 is a bent body of a metal plate such as stainless steel, magnesium, or aluminum.
　コイルアンテナ２の位置は、筒状導体１の軸方向における中心に対して、すなわち、平面視で、筒状導体１の中心（図２中の点Ｏ）に対して、筒状導体１の第１開口１１方向へオフセットしている。また、コイルアンテナ２は、筒状導体１の第１開口１１の高さ方向（Ｚ軸方向）、左右の幅方向（Ｘ軸方向）のいずれについてもほぼ中央に配置されている。なお、コイルアンテナ２は筒状導体１の第１開口１１の高さ方向、左右の幅方向のいずれについてもほぼ中央に配置されている必要は無く、第１開口１１の高さ方向、左右の幅方向においてオフセットされていてもよい。 The coil antenna 2 is positioned with respect to the center of the cylindrical conductor 1 in the axial direction, that is, with respect to the center of the cylindrical conductor 1 (point O in FIG. 2) in plan view. It is offset in the direction of one opening 11. The coil antenna 2 is disposed substantially at the center in both the height direction (Z-axis direction) and the left-right width direction (X-axis direction) of the first opening 11 of the cylindrical conductor 1. Note that the coil antenna 2 does not have to be disposed substantially in the center in either the height direction of the first opening 11 of the cylindrical conductor 1 or the width direction of the left and right sides. It may be offset in the width direction.
　図３はコイルアンテナ２の内部の構成を示す分解斜視図である。コイルアンテナ２は、基材層２０ａ，２０ｂ，２０ｃ，２０ｄ，２０ｅと、これら基材層のうち所定の基材層に形成された導体パターンとで構成される。基材層２０ｂ，２０ｃ，２０ｄは磁性体層であり、基材層２０ａ，２０ｅは非磁性体層である。上記磁性体層はコイルアンテナの磁性体コアとして作用する。 FIG. 3 is an exploded perspective view showing the internal configuration of the coil antenna 2. The coil antenna 2 includes base material layers 20a, 20b, 20c, 20d, and 20e, and a conductor pattern formed on a predetermined base material layer among these base material layers. The base material layers 20b, 20c, and 20d are magnetic layers, and the base material layers 20a and 20e are nonmagnetic layers. The magnetic layer acts as a magnetic core of the coil antenna.
　基材層２０ｂの上面には複数のコイル導体２３、基材層２０ｅの上面に複数のコイル導体２４がそれぞれ形成されている。基材層２０ｂ，２０ｃ，２０ｄには、コイル導体２３，２４間を層間接続する層間接続導体（ビア導体）２５が形成されている。基材層２０ｅの下面には実装用電極２１，２２，２７が形成されている。複数のコイル導体２３の配列方向の両端のコイル導体２３の端部は層間接続導体２６を介して実装用電極２１，２２にそれぞれ接続されている。このようにコイルアンテナ２は、表面実装型のチップ部品として構成されている。このコイルアンテナ２の大きさは、例えば5.7mm×2.8mm×0.9mmである。 A plurality of coil conductors 23 are formed on the upper surface of the base material layer 20b, and a plurality of coil conductors 24 are formed on the upper surface of the base material layer 20e. Interlayer connection conductors (via conductors) 25 that connect the coil conductors 23 and 24 to each other are formed on the base material layers 20b, 20c, and 20d. Mounting electrodes 21, 22, and 27 are formed on the lower surface of the base material layer 20e. The ends of the coil conductors 23 at both ends in the arrangement direction of the plurality of coil conductors 23 are connected to the mounting electrodes 21 and 22 via the interlayer connection conductor 26, respectively. Thus, the coil antenna 2 is configured as a surface-mounted chip component. The size of the coil antenna 2 is, for example, 5.7 mm × 2.8 mm × 0.9 mm.
　図４（Ａ）は本実施形態のアンテナ装置１０１が備える筒状導体１に流れる渦電流について示す図である。図４（Ｂ）は比較例のアンテナ装置が備える筒状導体１Ｐに流れる渦電流について示す図である。いずれも筒状導体の第１開口１１から見た図である。コイルアンテナ２のドット記号はコイルアンテナ２に生じる磁束の向きを示している。 FIG. 4A is a diagram showing eddy currents flowing through the cylindrical conductor 1 provided in the antenna device 101 of the present embodiment. FIG. 4B is a diagram illustrating an eddy current flowing through the cylindrical conductor 1P included in the antenna device of the comparative example. Both are views seen from the first opening 11 of the cylindrical conductor. The dot symbol of the coil antenna 2 indicates the direction of the magnetic flux generated in the coil antenna 2.
　図４（Ｂ）に示すように、筒状導体１にスリット１Ｓが形成されていないと、コイルアンテナ２を通る磁束により、図４（Ｂ）中に矢印で示すように、筒状導体１Ｐに渦電流が流れる。これに対し、本実施形態のアンテナ装置１０１では、導体１にスリット１Ｓが形成されていることにより、上記渦電流は流れず、筒状導体１による電磁界遮蔽が抑制され、通信相手側アンテナと磁界結合による通信が可能となる。 As shown in FIG. 4 (B), if the slit 1S is not formed in the cylindrical conductor 1, the magnetic flux passing through the coil antenna 2 causes the cylindrical conductor 1P to move as shown by an arrow in FIG. 4 (B). Eddy current flows. On the other hand, in the antenna device 101 of the present embodiment, the slit 1S is formed in the conductor 1, so that the eddy current does not flow, the electromagnetic field shielding by the cylindrical conductor 1 is suppressed, and the communication partner antenna and Communication by magnetic field coupling becomes possible.
　ここで、スリット１Ｓが形成されていない筒状導体でコイルアンテナが囲まれている比較例のアンテナ装置と本実施形態のアンテナ装置１０１とを比較する。 Here, the antenna device of the comparative example in which the coil antenna is surrounded by the cylindrical conductor in which the slit 1S is not formed is compared with the antenna device 101 of the present embodiment.
　通信相手側アンテナを直径70mmのコイルアンテナとし、通信相手側アンテナの中心から筒状導体１の第１開口１１までの距離を10mm、通信相手側アンテナの中心からコイルアンテナ２までの距離を11.5mmとしたとき、この比較例のアンテナ装置と通信相手側アンテナとの結合係数は僅か0.0025であり、殆ど結合しない。 The communication partner antenna is a coil antenna with a diameter of 70 mm, the distance from the center of the communication partner antenna to the first opening 11 of the cylindrical conductor 1 is 10 mm, and the distance from the center of the communication partner antenna to the coil antenna 2 is 11.5 mm. In this case, the coupling coefficient between the antenna device of this comparative example and the communication partner antenna is only 0.0025, and is hardly coupled.
　一方、本実施形態のアンテナ装置１０１と通信相手側アンテナとの結合係数は0.0150である。また、筒状導体１を設けないコイルアンテナ２単体での結合係数は0.0157であるので、筒状導体１を設けることによる結合係数の低下は殆ど無い。 On the other hand, the coupling coefficient between the antenna device 101 of this embodiment and the communication partner antenna is 0.0150. Further, since the coupling coefficient of the coil antenna 2 alone without the cylindrical conductor 1 is 0.0157, there is almost no decrease in the coupling coefficient due to the provision of the cylindrical conductor 1.
　図５（Ａ）は本実施形態のアンテナ装置１０１と通信相手側アンテナ３との結合の様子を示す図である。図５（Ｂ）は比較例のアンテナ装置と通信相手側アンテナ３との結合の様子を示す図である。いずれも破線は磁束を示す。また、アンテナ装置に対する通信相手側アンテナ３の二つの位置関係を併せて図示している。 FIG. 5A is a diagram showing a state of coupling between the antenna device 101 of the present embodiment and the communication partner side antenna 3. FIG. 5B is a diagram showing a state of coupling between the antenna device of the comparative example and the communication partner side antenna 3. In both cases, the broken lines indicate magnetic flux. In addition, two positional relationships of the communication partner antenna 3 with respect to the antenna device are also illustrated.
　図５（Ｂ）に示すように、比較例のアンテナ装置は、コイルアンテナ２が筒状導体１の中央に配置されている。そのため、第１開口１１、第２開口１２およびスリット１Ｓを出入りする磁束は図に示す方向に視て左右対称である。したがって、通信相手側アンテナ３がスリット１Ｓに沿って近接している状態では、通信相手側アンテナ３に磁束が実質的に鎖交せず、通信できない。 As shown in FIG. 5B, in the antenna device of the comparative example, the coil antenna 2 is arranged at the center of the cylindrical conductor 1. Therefore, the magnetic flux entering and exiting the first opening 11, the second opening 12, and the slit 1S is symmetric when viewed in the direction shown in the figure. Therefore, in a state where the communication partner antenna 3 is close along the slit 1S, the magnetic flux does not substantially interlink with the communication partner antenna 3, and communication is impossible.
　これに対して、本実施形態のアンテナ装置１０１は、図５（Ａ）に示すように、筒状導体１の第１開口１１寄りにコイルアンテナ２がオフセットしているので、この第１開口１１に、通信相手側アンテナ３が近接している状態で、コイルアンテナ２と通信相手側アンテナとは最も強く磁界結合する。また、通信相手側アンテナ３がスリット１Ｓに沿って近接している状態でも、通信相手側アンテナ３に磁束が鎖交し、通信可能である。 On the other hand, in the antenna device 101 of the present embodiment, as shown in FIG. 5A, the coil antenna 2 is offset toward the first opening 11 of the cylindrical conductor 1, so that the first opening 11 In addition, the coil antenna 2 and the communication partner antenna are most strongly magnetically coupled in a state where the communication partner antenna 3 is close. Further, even when the communication partner side antenna 3 is close along the slit 1S, the communication partner side antenna 3 is linked to the magnetic flux, and communication is possible.
《第２の実施形態》
　図６（Ａ）（Ｂ）は第２の実施形態に係るアンテナ装置１０２Ａ、１０２Ｂの斜視図である。第１の実施形態で図１に示したアンテナ装置１０１とはスリット１Ｓの形成位置が異なる。その他の構成は第１の実施形態のアンテナ装置１０１と同じである。 << Second Embodiment >>
6A and 6B are perspective views of the antenna devices 102A and 102B according to the second embodiment. The formation position of the slit 1S is different from the antenna device 101 shown in FIG. 1 in the first embodiment. Other configurations are the same as those of the antenna device 101 of the first embodiment.
　アンテナ装置１０２Ａの筒状導体１には、その１つの稜部にスリット１Ｓが形成されている。アンテナ装置１０２Ｂでは、筒状導体１の側面にスリット１Ｓが形成されている。いずれのアンテナ装置においても、スリット１Ｓは導体１に流れようとする渦電流を阻止する。そのため、第１の実施形態のアンテナ装置１０１と同様に、筒状導体１による電磁界遮蔽が抑制され、通信が可能となる。 In the cylindrical conductor 1 of the antenna device 102A, a slit 1S is formed at one ridge. In the antenna device 102 </ b> B, a slit 1 </ b> S is formed on the side surface of the cylindrical conductor 1. In any of the antenna devices, the slit 1S blocks eddy current that tends to flow through the conductor 1. Therefore, similarly to the antenna device 101 of the first embodiment, electromagnetic field shielding by the cylindrical conductor 1 is suppressed, and communication is possible.
　図７は第２の実施形態に係るアンテナ装置１０２Ｃの平面図である。筒状導体１のスリット１Ｓは、その途中に開口部１Ａを備えている。この開口部１Ａには押しボタンスイッチ等の操作部７が露出している。このように、スリット１Ｓの一部は所望の部材の露出部を兼ねていてもよい。操作部以外にカメラレンズ用の開口部、各種センサの検知部、マイク、スピーカー等のデバイスを兼ねてもよい。 FIG. 7 is a plan view of the antenna device 102C according to the second embodiment. The slit 1S of the cylindrical conductor 1 has an opening 1A in the middle thereof. An operation unit 7 such as a push button switch is exposed in the opening 1A. Thus, a part of the slit 1S may also serve as an exposed portion of a desired member. In addition to the operation unit, it may also serve as a device such as an opening for a camera lens, a detection unit for various sensors, a microphone, and a speaker.
《第３の実施形態》
　図８は第３の実施形態に係るアンテナ装置１０３Ａの平面図である。第１の実施形態で図１に示したアンテナ装置１０１とは、スリット１Ｓの形状が異なる。本実施形態のアンテナ装置１０３Ａでは、筒状導体１に、その第１開口１１から第２開口１２方向に（筒状導体１の軸方向に）延伸するスリット１Ｓが形成されている。スリット１Ｓは第２開口１２まで達せず、途中で終わっている。但し、スリット１Ｓはコイルアンテナ２の位置より第２開口１２の方向へ更にＬだけ延伸している。 << Third Embodiment >>
FIG. 8 is a plan view of an antenna device 103A according to the third embodiment. The shape of the slit 1S is different from the antenna device 101 shown in FIG. 1 in the first embodiment. In the antenna device 103A of the present embodiment, a slit 1S extending from the first opening 11 toward the second opening 12 (in the axial direction of the cylindrical conductor 1) is formed in the cylindrical conductor 1. The slit 1S does not reach the second opening 12 and ends in the middle. However, the slit 1 </ b> S is further extended by L from the position of the coil antenna 2 in the direction of the second opening 12.
　このように、スリット１Ｓは第１開口１１から第２開口１２まで必ずしも連通していなくてもよい。磁束密度はコイルアンテナ２に近い程高い。すなわち、磁束密度分布はコイルアンテナ２の周囲に集中している。そのため、コイルアンテナ２から離れた筒状導体１の位置には流れる渦電流は小さい。 Thus, the slit 1S does not necessarily need to communicate from the first opening 11 to the second opening 12. The magnetic flux density is higher as it is closer to the coil antenna 2. That is, the magnetic flux density distribution is concentrated around the coil antenna 2. For this reason, the eddy current flowing in the position of the cylindrical conductor 1 away from the coil antenna 2 is small.
　図８に示したように、平面視でコイルアンテナ２の近接部分にスリット１Ｓが形成されていれば、コイルアンテナ２の磁束の変化を妨げる渦電流が効果的に抑制される。 As shown in FIG. 8, if the slit 1S is formed in the vicinity of the coil antenna 2 in plan view, the eddy current that hinders the change in the magnetic flux of the coil antenna 2 is effectively suppressed.
　上記スリット１Ｓが筒状導体１の第１開口から中央まで延伸している場合、アンテナ装置１０３Ａと通信相手側アンテナとの結合係数は0.0106である。第１の実施形態で示した、スリット１Ｓが第１開口１１から第２開口１２まで連接しているアンテナ装置１０１の結合係数は0.0150であるので、結合係数の大きな低下は無い。 When the slit 1S extends from the first opening of the cylindrical conductor 1 to the center, the coupling coefficient between the antenna device 103A and the communication partner antenna is 0.0106. Since the coupling coefficient of the antenna device 101 in which the slit 1S is connected from the first opening 11 to the second opening 12 shown in the first embodiment is 0.0150, there is no significant decrease in the coupling coefficient.
　図９は第３の実施形態に係る別のアンテナ装置１０３Ｂの斜視図である。第１の実施形態で図１に示したアンテナ装置１０１とは、筒状導体１の形状が異なる。本実施形態のアンテナ装置１０３Ｂでは、筒状導体１の第２開口１２の面積は第１開口１１の面積より小さい。スリット１Ｓは第１開口１１から第２開口１２まで連通している。 FIG. 9 is a perspective view of another antenna device 103B according to the third embodiment. The shape of the cylindrical conductor 1 is different from the antenna device 101 shown in FIG. 1 in the first embodiment. In the antenna device 103 </ b> B of the present embodiment, the area of the second opening 12 of the cylindrical conductor 1 is smaller than the area of the first opening 11. The slit 1 </ b> S communicates from the first opening 11 to the second opening 12.
　このように筒状導体１の実質的な開口面積が狭められていてもよい。その狭められた開口（図９の例では第２開口１２）に磁束が通るので、コイルアンテナ２の磁束の変化を妨げる渦電流が筒状導体に流れる現象は抑制される。なお、第１開口および第２開口はスリットとほぼ同じ幅のスリットとして構成されていてもよい。 Thus, the substantial opening area of the cylindrical conductor 1 may be narrowed. Since the magnetic flux passes through the narrowed opening (second opening 12 in the example of FIG. 9), the phenomenon that an eddy current that hinders the change in the magnetic flux of the coil antenna 2 flows to the cylindrical conductor is suppressed. Note that the first opening and the second opening may be configured as slits having substantially the same width as the slits.
《第４の実施形態》
　第４の実施形態では電子機器の例を示す。図１０は電子機器２０１の正面図である。この電子機器２０１は、第１の実施形態で図１に示したアンテナ装置１０１の筒状導体１を筐体として利用したものである。したがって、電子機器２０１の全体の形状は図１に示したアンテナ装置１０１と同じである。 << Fourth Embodiment >>
The fourth embodiment shows an example of an electronic device. FIG. 10 is a front view of the electronic apparatus 201. This electronic apparatus 201 uses the cylindrical conductor 1 of the antenna device 101 shown in FIG. 1 in the first embodiment as a casing. Therefore, the overall shape of the electronic apparatus 201 is the same as that of the antenna device 101 shown in FIG.
　筒状導体（金属筐体）１の内部には回路基板４が収められている。回路基板４の上面にはコイルアンテナ２が実装されている。回路基板４の下面にはMicro USBのコネクタ５が実装されている。また、回路基板４の上部には電源としてのバッテリ６が配置されている。図１０には表れていないが、回路基板４には、コイルアンテナ２に接続されるRFICおよび共振周波数設定用チップキャパシタが実装されている。RFICはＮＦＣやFeliCa（登録商標）などのHF帯RFIDシステムで使用されるものである。このRFICおよび共振周波数設定用チップキャパシタは本発明に係る「給電回路」の例である。回路基板４には更にBluetooth（登録商標）で通信を行うための通信回路が設けられている。 A circuit board 4 is housed inside the cylindrical conductor (metal casing) 1. A coil antenna 2 is mounted on the upper surface of the circuit board 4. A Micro 下面 USB connector 5 is mounted on the lower surface of the circuit board 4. In addition, a battery 6 as a power source is disposed on the circuit board 4. Although not shown in FIG. 10, an RFIC connected to the coil antenna 2 and a resonance frequency setting chip capacitor are mounted on the circuit board 4. RFIC is used in HF band RFID systems such as NFC and FeliCa (registered trademark). The RFIC and the resonance frequency setting chip capacitor are examples of the “feed circuit” according to the present invention. The circuit board 4 is further provided with a communication circuit for performing communication by Bluetooth (registered trademark).
　各種部品が実装された回路基板４およびバッテリ６と筒状導体１の内面との間には樹脂部材が設けされていて、回路基板４およびバッテリ６は筒状導体１に対して樹脂部材を介して緩衝保持されている。 A resin member is provided between the circuit board 4 and the battery 6 on which various components are mounted and the inner surface of the cylindrical conductor 1, and the circuit board 4 and the battery 6 pass through the resin member with respect to the cylindrical conductor 1. Buffered.
　電子機器２０１は、コイルアンテナ２を用いてＮＦＣで通信を行う。本実施形態では、電子機器２０１は例えばBluetooth（登録商標）でデジタル音声データを受信するヘッドセットコントローラであり、ＮＦＣを用いてBluetooth（登録商標）のペアリングを行う。上記コネクタ５はバッテリ６の充電用に用いられる。 The electronic device 201 performs communication by NFC using the coil antenna 2. In the present embodiment, the electronic device 201 is a headset controller that receives digital audio data by Bluetooth (registered trademark), for example, and performs pairing of Bluetooth (registered trademark) using NFC. The connector 5 is used for charging the battery 6.
　このように筒状導体１を電子機器２０１の金属筐体として用いることにより、薄い筐体を用いて小型化でき、デザイン性も高めることができる。 Thus, by using the cylindrical conductor 1 as a metal casing of the electronic device 201, it is possible to reduce the size by using a thin casing and to improve the design.
　なお、電子機器としては、例えば、スマートフォンやフィーチャーフォン等の携帯電話、スマートウォッチやスマートグラス等のウェアラブル端末、ノートＰＣ、タブレット端末、カメラ、ゲーム機、玩具等が挙げられる。 Note that examples of electronic devices include mobile phones such as smartphones and feature phones, wearable terminals such as smart watches and smart glasses, notebook PCs, tablet terminals, cameras, game machines, and toys.
　なお、筒状導体の形状は角筒状に限らず、円筒状、楕円筒状、多角形の筒状等であっても同様に適用できる。 It should be noted that the shape of the cylindrical conductor is not limited to a rectangular tube shape, but can be similarly applied to a cylindrical shape, an elliptical cylindrical shape, a polygonal cylindrical shape, and the like.
　また、スリットは直線状に延伸しているものに限らず、筒の軸方向に対して非平行であってもよい。また、スリットは直線状ではなく曲線状であってもよい。また、スリットは途中で屈曲する形状であってもよい。また、スリットは複数あってもよい。また、コイルアンテナは複数あってもよい。 Further, the slit is not limited to a straight line, and may be non-parallel to the axial direction of the cylinder. Further, the slit may be curved instead of linear. The slit may be bent in the middle. There may be a plurality of slits. There may be a plurality of coil antennas.
　なお、上述の実施形態では、主にＮＦＣ等の磁界結合を利用した通信システムにおけるアンテナ装置および電子機器を説明したが、上述の実施形態におけるアンテナ装置および電子機器は、磁界結合を利用した非接触電力伝送システム（電磁誘導方式、磁界共鳴方式）でも同様に用いることができる。例えば、上述の実施形態におけるアンテナ装置は、ＨＦ帯、特に6.78MHzまたは6.78MHz近傍の周波数で使用される磁界共鳴方式の非接触電力伝送システムの受電装置に受電アンテナ装置としてや、送電装置に送電アンテナ装置として適用できる。この場合でも、アンテナ装置は受電アンテナ装置や送電アンテナ装置として機能する。非接触電力伝送システムにおいて、アンテナ装置のコイルアンテナが有するコイル導体の両端は、使用周波数帯（ＨＦ帯、特に6.78MHz近傍）を操作する受電回路や送電回路に接続される。 In the above-described embodiment, the antenna device and the electronic device in the communication system mainly using magnetic field coupling such as NFC have been described. However, the antenna device and the electronic device in the above-described embodiment are contactless using magnetic field coupling. The power transmission system (electromagnetic induction method, magnetic field resonance method) can be used similarly. For example, the antenna device in the above-described embodiment is used as a power receiving antenna device for a power receiving device of a magnetic resonance type non-contact power transmission system used in the HF band, particularly in the vicinity of 6.78 MHz or 6.78 MHz, and transmits power to the power transmitting device. It can be applied as an antenna device. Even in this case, the antenna device functions as a power receiving antenna device or a power transmitting antenna device. In the non-contact power transmission system, both ends of the coil conductor included in the coil antenna of the antenna device are connected to a power reception circuit or a power transmission circuit that operates a use frequency band (HF band, particularly around 6.78 MHz).
　最後に、上述の実施形態の説明は、すべての点で例示であって、制限的なものではない。当業者にとって変形および変更が適宜可能である。例えば、異なる実施形態で示した構成の部分的な置換または組み合わせが可能である。本発明の範囲は、上述の実施形態ではなく、特許請求の範囲によって示される。さらに、本発明の範囲には、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 Finally, the description of the above embodiment is illustrative in all respects and not restrictive. Modifications and changes can be made as appropriate by those skilled in the art. For example, partial replacements or combinations of the configurations shown in the different embodiments are possible. The scope of the present invention is shown not by the above embodiments but by the claims. Furthermore, the scope of the present invention is intended to include all modifications within the meaning and scope equivalent to the scope of the claims.
ＡＸ…巻回軸
Ｏ…中心点
１…筒状導体（導体）
１Ａ…開口部
１Ｐ…筒状導体
１Ｓ…スリット
２…コイルアンテナ
３…通信相手側アンテナ
４…回路基板
５…コネクタ
６…バッテリ
７…操作部
１１…第１開口
１２…第２開口
２０ａ，２０ｂ，２０ｃ，２０ｄ，２０ｅ…基材層
２１，２２，２７…実装用電極
２３，２４…コイル導体
２６…層間接続導体
１０１，１０１Ａ，１０２Ａ，１０２Ｂ，１０２Ｃ，１０３Ａ，１０３Ｂ…アンテナ装置
２０１…電子機器 AX ... winding axis O ... center point 1 ... cylindrical conductor (conductor)
DESCRIPTION OF SYMBOLS 1A ... Opening part 1P ... Cylindrical conductor 1S ... Slit 2 ... Coil antenna 3 ... Communication partner side antenna 4 ... Circuit board 5 ... Connector 6 ... Battery 7 ... Operation part 11 ... 1st opening 12 ... 2nd opening 20a, 20b, 20c, 20d, 20e ... substrate layers 21, 22, 27 ... mounting electrodes 23, 24 ... coil conductor 26 ... interlayer connection conductors 101, 101A, 102A, 102B, 102C, 103A, 103B ... antenna device 201 ... electronic equipment

Claims (6)

  1. 　ヘリカル状に巻回された形状のコイル導体を有するコイルアンテナと、
    　前記コイルアンテナを囲む導体と、を備え、
    　前記導体は、第１開口、第２開口および側面を有し、
    前記コイルアンテナの前記コイル導体の巻回軸方向を実質的な軸方向とする内部が空洞の筒状をなし、
    　前記導体は、前記側面に前記第１開口から前記軸方向に延伸するスリットを有することを特徴とする、アンテナ装置。     A coil antenna having a helically wound coil conductor;
    A conductor surrounding the coil antenna,
    The conductor has a first opening, a second opening, and a side surface;
    The inside of the coil antenna having a substantially axial direction as the winding axis direction of the coil conductor has a hollow cylindrical shape,
    The antenna device according to claim 1, wherein the conductor has a slit extending in the axial direction from the first opening on the side surface.
  2. 　前記コイルアンテナの位置は、前記導体の前記軸方向における中心に対して前記第１開口の方向へオフセットしている、請求項１に記載のアンテナ装置。 The antenna device according to claim 1, wherein a position of the coil antenna is offset in a direction of the first opening with respect to a center of the conductor in the axial direction.
  3. 　平面視で、前記スリットは前記コイルアンテナの位置より前記第２開口の方向へ更に延伸している、請求項１または２に記載のアンテナ装置。 The antenna device according to claim 1 or 2, wherein the slit further extends in a direction of the second opening from a position of the coil antenna in a plan view.
  4. 　前記スリットは前記第１開口から前記第２開口まで連通している、請求項１から３のいずれかに記載のアンテナ装置。 The antenna device according to any one of claims 1 to 3, wherein the slit communicates from the first opening to the second opening.
  5. 　前記導体は、内部に前記コイルアンテナ以外の回路または部材を収納する筐体である、請求項１から４のいずれかに記載のアンテナ装置。 The antenna device according to any one of claims 1 to 4, wherein the conductor is a housing that accommodates a circuit or a member other than the coil antenna therein.
  6. 　請求項１から５のいずれかに記載のアンテナ装置と、前記コイルアンテナに接続される給電回路とを備える、電子機器。 An electronic device comprising the antenna device according to any one of claims 1 to 5 and a power feeding circuit connected to the coil antenna.
PCT/JP2016/053895 2015-02-13 2016-02-10 Antenna device and electronic device WO2016129620A1 (en)

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