WO2016136622A1 - Antenna apparatus and electronic device - Google Patents

Antenna apparatus and electronic device Download PDF

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Publication number
WO2016136622A1
WO2016136622A1 PCT/JP2016/054874 JP2016054874W WO2016136622A1 WO 2016136622 A1 WO2016136622 A1 WO 2016136622A1 JP 2016054874 W JP2016054874 W JP 2016054874W WO 2016136622 A1 WO2016136622 A1 WO 2016136622A1
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WO
WIPO (PCT)
Prior art keywords
antenna
antenna coil
magnetic sheet
side portion
coil
Prior art date
Application number
PCT/JP2016/054874
Other languages
French (fr)
Japanese (ja)
Inventor
折原　勝久
Original Assignee
デクセリアルズ株式会社
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Filing date
Publication date
Application filed by デクセリアルズ株式会社 filed Critical デクセリアルズ株式会社
Publication of WO2016136622A1 publication Critical patent/WO2016136622A1/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • 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
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • 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
    • H01Q7/06—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 with core of ferromagnetic material

Definitions

  • the present invention relates to an antenna device that is incorporated in an electronic device and communicates with an external device such as a transmitter via an electromagnetic field signal, and an electronic device in which the antenna device is incorporated.
  • an antenna module for RFID Radio Frequency Identification
  • This antenna module performs communication using an inductive coupling with an antenna coil mounted on a transmitter such as a reader / writer. That is, in this antenna module, when the antenna coil receives the magnetic field from the reader / writer, the antenna coil can convert it into electric power and drive an IC that functions as a communication processing unit.
  • the antenna module needs to receive a magnetic flux of a certain value or more from the reader / writer with the antenna coil in order to reliably communicate. Therefore, in the antenna module according to the conventional example, a loop coil is provided in the casing of the mobile phone, and the coil receives the magnetic flux from the reader / writer.
  • the antenna module incorporated in an electronic device such as a cellular phone has a magnetic flux from the reader / writer rebounded due to an eddy current generated when a metal such as a substrate or a battery pack inside the device receives a magnetic field from the reader / writer. End up. For example, when considering the surface of a mobile phone case, the magnetic field coming from the reader / writer tends to be strong at the outer peripheral portion of the case surface and weak near the center of the case surface.
  • the loop coil In the case of an antenna using a normal loop coil, the loop coil is located at the central portion of the mobile phone where the opening portion cannot receive the magnetic field passing through the outer peripheral portion of the casing surface described above. For this reason, in the antenna using a normal loop coil, the efficiency which receives a magnetic field has deteriorated. Therefore, in an RFID antenna module built in an electronic device, a method for improving communication characteristics by using a metal plate such as a substrate, or an antenna device for increasing performance by increasing magnetic flux using a magnetic sheet has been proposed. (For example, refer to Patent Documents 1 to 4).
  • the coil resistance of the antenna rises due to the eddy current induced in the metal plate by the magnetic field generated by the antenna, and resonance at the frequency of the electromagnetic wave received by the tuning circuit constituting the antenna.
  • the Q value which is a characteristic related to the communication sensitivity of the antenna coil into which the magnetic field is efficiently drawn, is lowered, the communication performance of the antenna is lowered.
  • the present invention has been made in view of the above problems, and an object thereof is to provide a new and improved antenna device and electronic apparatus capable of suppressing a decrease in the Q value of an antenna.
  • One embodiment of the present invention is an antenna device which is incorporated in an electronic device and communicates with an external device via an electromagnetic field signal, and is wound so that the conductive wires facing in the width direction are close to each other through the opening.
  • An antenna coil that is inductively coupled to the external device, and is formed of a magnetic material, and the antenna coil overlaps at least a part of the antenna coil on a side opposite to the surface facing the external device.
  • a magnetic sheet provided penetrating through the opening, and the antenna coil has one side portion in which the conducting wire circulates in one direction via a center line that vertically cuts the opening in the longitudinal direction, and the conducting wire Bisected into the other side that circulates in the other direction, the one side overlaps the magnetic sheet on the surface opposite to the facing surface, the other side overlaps the magnetic sheet on the facing surface, and , Serial configured so as to shift to the opening side than the end portion of the other side end portion of the magnetic sheet which overlaps with the other side is the antenna coil.
  • the resistance of the antenna using the magnetic shield effect by the metal plate is reduced by shifting the end of the magnetic sheet from the end of the antenna coil, so that the reduction of the Q value can be suppressed.
  • the end portion of the magnetic sheet is configured such that the antenna coil is configured to be larger in the width direction than the magnetic sheet, or the magnetic sheet is configured to be smaller in the width direction than the antenna coil. It is good also as shifting to the said opening part side rather than the said edge part of the said other side part of the said antenna coil.
  • the end of the magnetic sheet is located on the opening side by a distance that is half the width of the other side than the end of the other side of the antenna coil. It is good also as shifting to.
  • the antenna coil may have a pitch different from a pitch of the conducting wire that circulates to the one side portion as a pitch of the conducting wire that circulates to the other side portion.
  • the difference in inductance between the one side and the other side can be made different, so that the deterioration in communication performance due to the induced voltages of the one side and the other side of the antenna coil canceling each other is reduced. it can.
  • the antenna coil may be configured to be provided by winding the conducting wire in a substantially strip shape.
  • the induction of the one side and the other side of the antenna coil is achieved by utilizing the magnetic shielding effect of the metal plate.
  • Good communication characteristics can be obtained by reducing deterioration in communication performance due to voltage canceling each other.
  • Another aspect of the present invention is an electronic device in which any of the antenna devices described above is incorporated and can communicate with an external device via an electromagnetic field signal.
  • good antenna communication characteristics of an electronic device with respect to an external device can be ensured by suppressing a reduction in the Q value of the antenna.
  • the end of the magnetic sheet is shifted from the end of the antenna coil, thereby reducing the resistance of the small NFC antenna using the magnetic shield effect by the metal plate and reducing the Q value. Therefore, good communication performance of the antenna can be ensured.
  • FIG. 1 is a perspective view illustrating a schematic configuration of a wireless communication system to which an antenna device according to an embodiment of the present invention is applied.
  • FIG. 2A is a perspective view illustrating an example of an electronic apparatus including the antenna device according to the embodiment of the present invention
  • FIG. 2B is a cross-sectional view for explaining the arrangement of the antenna device according to the embodiment of the present invention. It is.
  • FIG. 3A is a perspective view illustrating a schematic configuration of an antenna device according to an embodiment of the present invention
  • FIG. 3B is a cross-sectional view illustrating a schematic configuration of the antenna device according to an embodiment of the present invention.
  • 4A is a perspective view illustrating a schematic configuration of an antenna device according to another embodiment of the present invention
  • FIG. 4B is a cross-sectional view illustrating a schematic configuration of an antenna device according to another embodiment of the present invention.
  • FIG. 5A is a perspective view illustrating a schematic configuration of an antenna device according to another embodiment of the present invention
  • FIG. 5B is a cross-sectional view illustrating a schematic configuration of the antenna device according to another embodiment of the present invention.
  • FIG. 6A is a perspective view showing a schematic configuration of an antenna device according to another embodiment of the present invention
  • FIG. 6B is a cross-sectional view showing a schematic configuration of the antenna device according to another embodiment of the present invention.
  • FIG. 7A is a perspective view illustrating a schematic configuration of an antenna device according to another embodiment of the present invention, and FIG.
  • FIG. 7B is a cross-sectional view illustrating a schematic configuration of the antenna device according to another embodiment of the present invention.
  • FIG. 8A is a perspective view showing a schematic configuration of a conventional antenna device as a comparative example of the antenna device according to one embodiment of the present invention
  • FIG. 8B is a cross-sectional view showing the magnetic field strength of the antenna device in the comparative example.
  • FIG. 9A is a perspective view illustrating a schematic configuration of an example of an antenna device according to an embodiment of the present invention
  • FIG. 9B is a cross-sectional view illustrating the magnetic field strength of the antenna device according to the example.
  • FIG. 10A is a perspective view illustrating a schematic configuration of another example of the antenna device according to the embodiment of the present invention
  • FIG. 10B is a cross-sectional view illustrating the magnetic field strength of the antenna device according to the other example.
  • FIG. 11A is a perspective view for explaining an evaluation test for confirming the operation / effect of the antenna device according to the embodiment of the present invention
  • FIG. 11B is a diagram of the antenna device according to the embodiment of the present invention. It is sectional drawing for demonstrating the evaluation test for confirming an effect
  • FIG. 1 is a perspective view illustrating a schematic configuration of a wireless communication system to which an antenna device according to an embodiment of the present invention is applied
  • FIG. 2A is an electronic device including the antenna device according to an embodiment of the present invention. It is a perspective view which shows an example
  • FIG. 2: B is sectional drawing for demonstrating arrangement
  • the antenna device 1 is a device that is incorporated in an electronic device 30 and communicates with an external device via an electromagnetic field signal.
  • the antenna device 1 is incorporated in an RFID wireless communication system 100 as shown in FIG. Used.
  • the wireless communication system 100 includes an antenna device 1 provided in an electronic device 30 and a reader / writer 40 serving as an external device that accesses the antenna device 1.
  • the antenna device 1 and the reader / writer 40 are arranged to face each other on the XY plane of the three-dimensional orthogonal coordinate system XYZ shown in FIG.
  • the reader / writer 40 functions as a transmitter that transmits a magnetic field in the Z-axis direction to the antenna devices 1 that face each other in the XY plane, and specifically, an antenna 41 that transmits a magnetic field toward the antenna device 1 And a control board 42 that communicates with the antenna device 1 that is inductively coupled via the antenna 41.
  • the reader / writer 40 is provided with a control board 42 electrically connected to the antenna 41.
  • a control circuit 43 made of electronic components such as one or a plurality of integrated circuit chips is mounted on the control board 42.
  • the control circuit 43 executes various processes based on the data received from the antenna device 1.
  • the control circuit 43 when transmitting data to the antenna device 1, the control circuit 43 encodes the data, modulates a carrier wave of a predetermined frequency (for example, 13.56 MHz) based on the encoded data, and modulates the data.
  • the modulated signal is amplified, and the antenna 41 is driven by the amplified modulated signal.
  • the control circuit 43 when reading data from the antenna device 1, the control circuit 43 amplifies the modulation signal of the data received by the antenna 41, demodulates the modulation signal of the amplified data, and decodes the demodulated data.
  • the control circuit 43 uses an encoding method and a modulation method used in a general reader / writer. For example, a Manchester encoding method or an ASK (Amplitude Shift Keying) modulation method is used.
  • a Manchester encoding method or an ASK (Amplitude Shift Keying) modulation method is used.
  • ASK Amplitude Shift Keying
  • the antenna device 1 is incorporated into a housing 32 of an electronic device 30 such as a mobile phone that is disposed so as to face the reader / writer 40 in the XY plane, for example.
  • the antenna device includes an antenna module 2 having an antenna substrate 11 (see FIG. 2A) on which an antenna coil 12 capable of communicating with an inductively coupled reader / writer 40 is mounted.
  • a communication processing unit 13 that is driven by a flowing current and performs communication with the reader / writer 40 and the metal plate 3 are provided.
  • the antenna module 2 is provided inside the housing 32 (see FIG. 2A) of the electronic device 30 and communicates with the reader / writer 40 that is inductively coupled.
  • the antenna module 2 includes an antenna substrate 11, a communication processing unit 13, and a connection unit 14.
  • an antenna coil 12 formed by performing a patterning process or the like on a flexible conductive wire 12 a such as a flexible flat cable, and the antenna coil 12 and the communication processing unit 13 are electrically connected to the antenna substrate 11.
  • a terminal portion 14 is mounted.
  • the antenna coil 12 When the antenna coil 12 receives a magnetic field transmitted from the reader / writer 40, the antenna coil 12 is magnetically coupled to the reader / writer 40 by inductive coupling, receives the modulated electromagnetic wave, and performs communication processing of the received signal via the terminal unit 14. It has a function of supplying to the unit 13. As shown in FIG. 2A, the antenna coil 12 has a substantially strip shape, and one conductor 12a of the antenna coil 12 is circulated along the outer shape, and the center side is an opening 12b. That is, the antenna coil 12 is provided by being wound so that the conducting wires 12a facing each other in the width direction (X direction shown in FIG. 2A) are close to each other through the opening 12b. The antenna coil 12 is arranged so that the main surface around which the conducting wire 12a circulates opposes the reader / writer 40 in the XY plane shown in FIG. 1 during communication.
  • the communication processing unit 13 is driven by the current flowing through the antenna coil 12 and communicates with the reader / writer 40. Specifically, the communication processing unit 13 demodulates the received modulation signal, decodes the demodulated data, and writes the decoded data in the internal memory of the communication processing unit 13. The communication processing unit 13 reads the data to be transmitted to the reader / writer 40 from the internal memory, encodes the read data, modulates the carrier wave based on the encoded data, and is magnetically coupled by inductive coupling. The radio wave modulated through the coil 12 is transmitted to the reader / writer 40. Note that the communication processing unit 13 may be driven not by power flowing through the antenna coil 12 but by power supplied from a power supply unit such as a battery pack or an external power source incorporated in the electronic device.
  • a power supply unit such as a battery pack or an external power source incorporated in the electronic device.
  • the metal plate 3 is provided in the housing 32 of the electronic device 30 and serves as a first conductor facing the reader / writer 40 serving as an external device.
  • the metal plate 3 is provided in a housing of an electronic device such as a mobile phone, a smartphone, or a tablet PC, for example, and constitutes a first conductor that faces the reader / writer 40 during communication of the antenna module 2.
  • a metal cover affixed to the inner surface of the smartphone casing, a metal casing of a battery pack stored in the smartphone, or the back surface of the liquid crystal module of the tablet PC Corresponds to a metal plate or the like.
  • the metal plate 3 such as a battery pack flows electricity relatively well, when an AC magnetic field is applied from the outside, an eddy current is generated and the magnetic field is rebounded. Examining the magnetic field distribution when an AC magnetic field is applied from the outside, the magnetic field at the end 3a of the metal plate 3 facing the reader / writer 40 is strong. For this reason, in this embodiment, the antenna coil 12 of the antenna module 2 is provided on the outer edge side of the metal plate 3 such as a battery pack provided in the housing 32 of the mobile phone 30. As described above, by providing the antenna coil 12 on the outer edge side of the metal plate 3, the electronic device 30 can be reduced in size when incorporated in the electronic device 30 such as a cellular phone, and can be favorably connected to the reader / writer 40. Communication characteristics are realized.
  • the antenna coil 12 is, for example, a metal plate such as a battery pack provided on the XY plane of the three-dimensional orthogonal coordinate system XYZ as shown in FIG. 3 and the inner peripheral wall 32 a of the housing 32.
  • the antenna coil 12 is not only between the metal plate 3 and the inner peripheral wall 32a of the casing 32 as described above, but also, for example, an electric conductor disposed inside the casing such as an integrated circuit board and the inside of the casing. You may make it provide in the clearance gap with a surrounding wall.
  • the magnetic sheet 20 is provided so as to penetrate the opening 12 b of the antenna coil 12.
  • the magnetic sheet 20 is formed of a magnetic material such as iron oxide, chromium oxide, cobalt, or ferrite, and in order to improve the communication characteristics of the antenna module 2, a magnetic flux sent from the reader / writer 40 during communication of the antenna module 2 is used as an antenna coil. 12 has a function of guiding toward the center side.
  • the antenna coil 12 includes the one side portion 12a1 in which the conducting wire 12a circulates in one direction and the other in which the conducting wire 12a circulates in the other direction via the center line L1 that vertically cuts the opening 12b in the longitudinal direction. Divided into side parts 12a2. And as shown in FIG. 2B, the one side portion 12a1 overlaps with the magnetic sheet 20 on the surface opposite to the surface facing the external device 40, and the other side portion 12a2 overlaps with the magnetic sheet 20 on the facing surface. And it is comprised so that the edge part 20c of the magnetic sheet 20 superimposed on the other side part 12a2 may shift
  • FIG. 3A is a perspective view illustrating a schematic configuration of an antenna device according to an embodiment of the present invention
  • FIG. 3B is a cross-sectional view illustrating a schematic configuration of the antenna device according to an embodiment of the present invention.
  • the antenna substrate 11 shown in FIG. 2B is omitted.
  • the antenna device 1 has a configuration in which an antenna coil 12 is provided by winding a conducting wire 12a in a substantially strip shape. That is, the antenna coil 12 is provided by being wound so that the conductors 12a facing each other in the width direction (X direction shown in FIG. 3A) are close to each other through the opening 12b, and the longitudinal direction (Y direction shown in FIG. 3A). ) Is a long shape so as to expand. Further, the antenna coil 12 has one side portion in which the conducting wire 12a circulates in one direction (the Y-axis positive direction shown in FIGS. 3A and 3B) via a center line L1 that is a straight line that cuts through the opening 12b in the longitudinal direction. 12a1 and the conducting wire 12 are divided into two sides 12a2 which circulate in the other direction (Y-axis negative direction shown in FIGS. 3A and 3B).
  • the magnetic sheet 20 made of a magnetic material such as ferrite is superimposed on a part of the antenna coil 12. It is provided through the opening 12b.
  • the antenna coil 12 is configured to be an elongated and substantially strip-shaped conductor wire 12a
  • the one side portion 12a1 and the other side portion of the antenna coil 12 are utilized by utilizing the magnetic shielding effect of the metal plate 3.
  • the magnetic sheet 20 is provided through the opening 12b of the antenna coil 12 to ensure good antenna communication characteristics. .
  • the present inventor has shifted the end 20c of the magnetic sheet 20 from the end 12c of the antenna coil 12 to thereby achieve the magnetic shielding effect by the metal plate 3. It has been found that the reduction of the Q value can be suppressed because the resistance of the antenna using the antenna is reduced.
  • the antenna device 1 has one side portion 12a1 of the antenna coil 12 superimposed on the magnetic sheet 20 on the surface opposite to the surface facing the reader / writer 40, and the other side.
  • the side portion 12a2 is configured to overlap the magnetic sheet 20 on the facing surface.
  • the antenna device 1 of the present embodiment is configured such that the end portion 20c of the magnetic sheet 20 overlapping the other side portion 12a2 is shifted to the opening 12b side from the end portion 12c of the other side portion 12a2 of the antenna coil 12. It is characterized by.
  • the antenna coil 12 is configured to be larger in the width direction than the magnetic sheet 20, or the magnetic sheet 20 is configured to be smaller in the width direction than the antenna coil 12, so that the end 20 c of the magnetic sheet 20 is It is configured to be shifted to the opening 12b side with respect to the end portion 12c of the other side portion 12a2.
  • the “width direction” mentioned here indicates the width direction (X-axis direction in FIG. 3A) with respect to the longitudinal direction (Y-axis direction in FIG. 3A) of the antenna coil 12.
  • the antenna device 1 of the present embodiment uses the magnetic shield effect that improves the communication performance of the antenna by placing the elongated antenna coil 12 in the longitudinal direction on the end 3a of the metal plate 3.
  • the magnetic sheet 20 is used in order to suppress the reduction of the Q value of the antenna. The end portion 20 c of the antenna coil 12 is shifted to the inside of the end portion 12 c of the antenna coil 12.
  • the antenna module 2 that is built in the electronic device 30 and improves the characteristics by using the magnetic flux concentration due to the magnetic shield effect of the metal plate 3 such as a substrate, the spread of the magnetic flux to the surface facing the metal plate 3 is reduced. For this reason, the area of the magnetic sheet 20 facing the metal plate 3 is made smaller than the area of the antenna coil 12.
  • the end 20c of the magnetic sheet 20 to the opening 12b side by a distance that is half the size in the width direction of the other side 12a2 from the end 12c of the other side 12a2 of the antenna coil 12, it is high. Since the Q value can be secured, the communication performance of the antenna is improved.
  • the “distance that is half the size of the other side portion 12a2 in the width direction” referred to here is about 50% to about 60% of the size of the other side portion 12a2 in the width direction (X-axis direction shown in FIG. 3B). It is assumed that the distance of about half the size is included.
  • the pitch of the conductor 12a of the antenna coil 12 is equal between the one side portion 12a1 and the other side portion 12a2, so that the one side portion 12a1 and the other side portion 12a2 are the same.
  • the antenna device 1 according to the embodiment of the present invention is not limited to such a case as long as the end 20c of the magnetic sheet 20 is configured to be shifted to the inside of the end 12c of the antenna coil 12.
  • the pitch of the conducting wire 112a of the antenna coil 112 having the magnetic sheet 120 penetrated through the opening 112b is smaller on the other side 112a2 than on the one side 112a1, and is magnetic.
  • the area of the portion overlapping the other side portion 112a2 of the sheet 120 may also be reduced.
  • the end portion 120c of the magnetic sheet 120 is used. Can be suppressed to the inside of the end 112c of the antenna coil 112, the reduction of the Q value of the antenna can be suppressed.
  • the pitch of the conductor 212a of the antenna coil 212 having the magnetic sheet 220 penetrated through the opening 212b may be larger on the other side 212a2 than on the first side 212a1.
  • the pitch interval between the conductive wires 212a of the one side portion 212a1 and the other side portion 212a2 is changed and the area of the other side portion 212a2 is larger than that of the one side portion 212a1, the end portion 220c of the magnetic sheet 220 is obtained.
  • the reduction of the Q value of the antenna can be suppressed.
  • the pitch of the conducting wire 312a of the antenna coil 312 having the opening 312b penetrated by the magnetic sheet 320 is larger on the other side 312a2 than on the one side 312a1, and magnetically
  • the areas of the portions overlapping the one side 312a1 and the other side 312a2 of the sheet 320 may be the same.
  • the end portion 320c of the magnetic sheet 320 is provided. Is configured to be shifted to the inside of the end 312c of the antenna coil 312, the reduction in the Q value of the antenna can be suppressed.
  • the pitch of the conductor 412a of the antenna coil 412 in which the magnetic sheet 420 is passed through the opening 412b is larger on the other side 412a2 than on the one side 412a1, and magnetically
  • the area of the portion overlapping the sheet 420 may be larger on the other side portion 412a2 than on the one side portion 412a1.
  • the pitch interval between the conductive wires 412a of the one side portion 412a1 and the other side portion 412a2 is changed so that the area of the other side portion 412a2 is larger than that of the one side portion 412a1 and overlaps the magnetic sheet 420.
  • the pitches of the conductors on one side and the other side of the antenna coil are made different sizes, and the magnitude of the inductance on one side and the other side can be made different. By doing so, it is possible to reduce deterioration of communication performance due to the induced voltages of the one side and the other side of the antenna coil canceling each other. Further, at that time, by shifting the end of the magnetic sheet from the end of the antenna coil, the resistance of the antenna using the magnetic shield effect by the metal plate is reduced, so that the reduction of the Q value can be suppressed.
  • FIG. 8A is a perspective view showing a schematic configuration of a conventional antenna device as a comparative example of the antenna device according to one embodiment of the present invention
  • FIG. 8B is a cross-sectional view showing the magnetic field strength of the antenna device in the comparative example.
  • FIG. 9A is a perspective view showing a schematic configuration of an example of the antenna device according to one embodiment of the present invention
  • FIG. 9B is a cross-sectional view showing the magnetic field strength of the antenna device in the example.
  • 10A is a perspective view illustrating a schematic configuration of another example of the antenna device according to the embodiment of the present invention
  • FIG. 10B is a cross-sectional view illustrating the magnetic field strength of the antenna device according to the other example. It is.
  • the magnetic sheet 520 is inserted into the opening 512b of the antenna coil 512 having 40 mm ⁇ 12 mm and the conductive wire 512a having four turns, and the end portion 520c of the magnetic sheet 520 (521, 522).
  • the magnetic field strength distribution was observed when the width of the magnetic sheet 520 (X-axis direction shown in FIG. 8) was changed by shifting the distance from the end portion 512c of the antenna coil 512.
  • the widths of the antenna coil 512 and the magnetic sheet 520 are substantially equal, when the width of the magnetic sheet is slightly narrow (coil width 12 mm, magnetic sheet width 10 mm), and when the width of the magnetic sheet is further reduced ( The distribution of magnetic field strength was observed when 0.05 W of power was supplied to the terminals of an NFC antenna (40 mm ⁇ 12 mm, 4 turns) in a coil width of 12 mm and a magnetic sheet width of 8 mm.
  • the widths of the antenna coil 512 and the magnetic sheet 520 are substantially the same, as shown in FIG. For this reason, when a metal plate is brought under a magnetic field expansion, the effect of magnetically shielding the metal plate acts on the metal plate, so that the current that flows generates Joule heat and is lost accordingly. As a result, the resistance of the antenna coil increases.
  • FIG. 11A is a perspective view for explaining an evaluation test for confirming the operation / effect of the antenna device according to the embodiment of the present invention
  • FIG. 11B is a diagram of the antenna device according to the embodiment of the present invention. It is sectional drawing for demonstrating the evaluation test for confirming an effect
  • FIG. 12 is a graph which shows the evaluation result in the evaluation test for confirming the effect
  • the magnetic sheet 620 passed through the opening 612b of the antenna coil 612 superimposed on the outer edge side of the metal plate 603 was cut from the end 620c, and the Q value improvement effect was evaluated. Specifically, when the size of the antenna coil 612 is 40 mm ⁇ 12 mm and the size of the aluminum plate 603 serving as the first metal plate is 100 mm ⁇ 100 mm ⁇ 0.3 mm, as shown in FIG. The change of the Q value of the antenna when the sheet 620 was cut from the end 620c and the distance to the end 620c of the antenna coil 620 was changed was confirmed.
  • FIG. 12 shows the evaluation results in the above-described evaluation test.
  • the magnetic sheet 620 is not cut, that is, compared with the case where the widths of the antenna coil 612 and the magnetic sheet 620 are substantially equal, if the magnetic sheet 620 is cut from the end 620c, the antenna Q value Can be seen to rise.
  • the cut width from the end 620c of the magnetic sheet 620 is larger than 3 mm, the Q value starts to decrease.

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Abstract

A decrease in antenna Q factor is alleviated. An antenna apparatus (1) built inside an electronic device (30) to perform communication with an external device (40) via an electromagnetic field signal is provided with: an antenna coil (12) comprising conductive wires (12a) that oppose each other in a width direction across an opening portion (12b) and that are wound in such a manner as to be proximate to each other, the antenna coil being inductively coupled with the external device; and a magnetic sheet (20) provided penetrating through the opening portion in such a way as to overlap at least a part of the antenna coil on the opposite side from an opposing surface of the antenna coil which opposes the external device. The antenna coil is divided into two portions across a center line longitudinally traversing the opening portion in a longitudinal direction of the antenna coil, namely a one-side portion (12a1) in which the conductive wires are run around in one direction and an other-side portion (12a2) in which the conductive wires are run around in the opposite direction. The one-side portion is overlapped by the magnetic sheet on the opposite side from the opposing surface while the other-side portion is overlapped by the magnetic sheet on the opposing surface, and the end of the magnetic sheet that overlaps the other-side portion is displaced further toward the opening portion side than is the end of the other-side portion of the antenna coil.

Description

アンテナ装置、及び電子機器ANTENNA DEVICE AND ELECTRONIC DEVICE
　本発明は、電子機器に組み込まれ、発信器等の外部機器と電磁界信号を介して通信するアンテナ装置、及びこのアンテナ装置が組み込まれた電子機器に関する。本出願は、日本国において２０１５年２月２６日に出願された日本特許出願番号特願２０１５－０３６３８１を基礎として優先権を主張するものであり、これらの出願を参照することにより、本出願に援用される。 The present invention relates to an antenna device that is incorporated in an electronic device and communicates with an external device such as a transmitter via an electromagnetic field signal, and an electronic device in which the antenna device is incorporated. This application claims priority on the basis of Japanese Patent Application No. 2015-036381 filed on Feb. 26, 2015 in Japan. By referring to these applications, the present application Incorporated.
　携帯電話機等の電子機器において、近距離非接触通信の機能を搭載するため、ＲＦＩＤ（Radio Frequency Identification）用のアンテナモジュールが用いられている。このアンテナモジュールは、リーダライタ等の発信器に搭載されたアンテナコイルと誘導結合を利用して通信を行っている。すなわち、このアンテナモジュールは、リーダライタからの磁界をアンテナコイルが受けることによって、それを電力に変換して通信処理部として機能するＩＣを駆動させることができる。 In an electronic device such as a mobile phone, an antenna module for RFID (Radio Frequency Identification) is used in order to incorporate a short-range non-contact communication function. This antenna module performs communication using an inductive coupling with an antenna coil mounted on a transmitter such as a reader / writer. That is, in this antenna module, when the antenna coil receives the magnetic field from the reader / writer, the antenna coil can convert it into electric power and drive an IC that functions as a communication processing unit.
　アンテナモジュールは、確実に通信を行うため、リーダライタからのある値以上の磁束をアンテナコイルで受ける必要がある。そのために、従来例に係るアンテナモジュールでは、携帯電話機の筐体にループコイルを設け、このコイルでリーダライタからの磁束を受けている。携帯電話機等の電子機器に組み込まれたアンテナモジュールは、機器内部の基板やバッテリパック等の金属がリーダライタからの磁界を受けることによって発生する渦電流のために、リーダライタからの磁束が跳ね返されてしまう。例えば、携帯電話機の筐体表面で考えると、リーダライタから来る磁界は、筐体表面の外周部分が強くなり、筐体表面の真ん中付近が弱くなる傾向にある。 The antenna module needs to receive a magnetic flux of a certain value or more from the reader / writer with the antenna coil in order to reliably communicate. Therefore, in the antenna module according to the conventional example, a loop coil is provided in the casing of the mobile phone, and the coil receives the magnetic flux from the reader / writer. The antenna module incorporated in an electronic device such as a cellular phone has a magnetic flux from the reader / writer rebounded due to an eddy current generated when a metal such as a substrate or a battery pack inside the device receives a magnetic field from the reader / writer. End up. For example, when considering the surface of a mobile phone case, the magnetic field coming from the reader / writer tends to be strong at the outer peripheral portion of the case surface and weak near the center of the case surface.
　通常のループコイルを用いるアンテナの場合では、ループコイルは、その開口部が上述した筐体表面の外周部分を通過する磁界をあまり受けられない携帯電話機の中央部分に位置している。このため、通常のループコイルを用いるアンテナでは、磁界を受ける効率が悪くなっている。そこで、電子機器に内蔵するＲＦＩＤアンテナモジュールにおいて、基板等の金属板を利用して通信特性を高める方法や、磁性シートを用いて磁束を増やして性能を高めるようにしたアンテナ装置が提案されている（例えば、特許文献１乃至４参照）。 In the case of an antenna using a normal loop coil, the loop coil is located at the central portion of the mobile phone where the opening portion cannot receive the magnetic field passing through the outer peripheral portion of the casing surface described above. For this reason, in the antenna using a normal loop coil, the efficiency which receives a magnetic field has deteriorated. Therefore, in an RFID antenna module built in an electronic device, a method for improving communication characteristics by using a metal plate such as a substrate, or an antenna device for increasing performance by increasing magnetic flux using a magnetic sheet has been proposed. (For example, refer to Patent Documents 1 to 4).
特開２０１０－２４５７７６号公報JP 2010-245776 A 特開２０１０－２５２４０２号公報JP 2010-252402 A 特開２０１１－２２９１３３号公報JP 2011-229133 A 特開２０１２－２１７１３３号公報JP 2012-217133 A
　しかしながら、ＮＦＣアンテナと金属板が近接した場合、アンテナで発生する磁場によって金属板に誘導される渦電流でアンテナのコイル抵抗が上昇して、アンテナを構成する同調回路が受信する電磁波の周波数における共振のピークの鋭さを示すＱ値（Quality factor）が低下する問題があった。磁界が効率よく引き込まれるアンテナコイルの通信感度に係る特性となるＱ値が下がると、アンテナの通信性能が低下してしまう。 However, when the NFC antenna and the metal plate are close to each other, the coil resistance of the antenna rises due to the eddy current induced in the metal plate by the magnetic field generated by the antenna, and resonance at the frequency of the electromagnetic wave received by the tuning circuit constituting the antenna. There has been a problem that the Q value (Quality factor) indicating the sharpness of the peak is lowered. If the Q value, which is a characteristic related to the communication sensitivity of the antenna coil into which the magnetic field is efficiently drawn, is lowered, the communication performance of the antenna is lowered.
　本発明は、上記課題に鑑みてなされたものであり、アンテナのＱ値の低下を抑制することの可能な新規かつ改良されたアンテナ装置、及び電子機器を提供することを目的とする。 The present invention has been made in view of the above problems, and an object thereof is to provide a new and improved antenna device and electronic apparatus capable of suppressing a decrease in the Q value of an antenna.
　本発明の一態様は、電子機器に組み込まれ、外部機器と電磁界信号を介して通信するアンテナ装置であって、その開口部を介して幅方向に対向する導線が互いに近接するように巻回して設けられ、前記外部機器と誘導結合されるアンテナコイルと、磁性体から形成され、前記アンテナコイルの前記外部機器との対向面と反対側に少なくとも該アンテナコイルの一部と重畳するように前記開口部を貫通して設けられる磁性シートと、を備え、前記アンテナコイルは、その長手方向に前記開口部を縦断する中心線を介して前記導線が一方向に周回する一方側部と前記導線が他方向に周回する他方側部に二分され、前記一方側部が前記対向面と反対側の面で前記磁性シートと重畳し、前記他方側部が前記対向面で前記磁性シートと重畳し、かつ、前記他方側部と重畳する前記磁性シートの端部が前記アンテナコイルの前記他方側部の端部よりも前記開口部側にずれるように構成される。 One embodiment of the present invention is an antenna device which is incorporated in an electronic device and communicates with an external device via an electromagnetic field signal, and is wound so that the conductive wires facing in the width direction are close to each other through the opening. An antenna coil that is inductively coupled to the external device, and is formed of a magnetic material, and the antenna coil overlaps at least a part of the antenna coil on a side opposite to the surface facing the external device. A magnetic sheet provided penetrating through the opening, and the antenna coil has one side portion in which the conducting wire circulates in one direction via a center line that vertically cuts the opening in the longitudinal direction, and the conducting wire Bisected into the other side that circulates in the other direction, the one side overlaps the magnetic sheet on the surface opposite to the facing surface, the other side overlaps the magnetic sheet on the facing surface, and , Serial configured so as to shift to the opening side than the end portion of the other side end portion of the magnetic sheet which overlaps with the other side is the antenna coil.
　本発明の一態様によれば、磁性シートの端部をアンテナコイルの端部からずらすことによって、金属板による磁気シールド効果を利用したアンテナの抵抗を低減させるので、Ｑ値の低減を抑制できる。 According to one aspect of the present invention, the resistance of the antenna using the magnetic shield effect by the metal plate is reduced by shifting the end of the magnetic sheet from the end of the antenna coil, so that the reduction of the Q value can be suppressed.
　このとき、本発明の一態様では、前記アンテナコイルを前記磁性シートより幅方向に大きい構成、又は前記磁性シートを前記アンテナコイルより幅方向に小さい構成にすることによって、前記磁性シートの前記端部を前記アンテナコイルの前記他方側部の前記端部よりも前記開口部側にずらすこととしてもよい。 At this time, in one aspect of the present invention, the end portion of the magnetic sheet is configured such that the antenna coil is configured to be larger in the width direction than the magnetic sheet, or the magnetic sheet is configured to be smaller in the width direction than the antenna coil. It is good also as shifting to the said opening part side rather than the said edge part of the said other side part of the said antenna coil.
　このようにすれば、磁性シートの端部をアンテナコイルの端部からずらせるので、金属板による磁気シールド効果を利用したアンテナの抵抗を低減させて、Ｑ値の低減を抑制できるようになる。 In this way, since the end of the magnetic sheet is displaced from the end of the antenna coil, the resistance of the antenna using the magnetic shielding effect by the metal plate can be reduced, and the reduction of the Q value can be suppressed.
　また、本発明の一態様では、前記磁性シートの前記端部を前記アンテナコイルの前記他方側部の前記端部よりも該他方側部の幅方向の大きさの半分の距離だけ前記開口部側にずらすこととしてもよい。 Moreover, in one aspect of the present invention, the end of the magnetic sheet is located on the opening side by a distance that is half the width of the other side than the end of the other side of the antenna coil. It is good also as shifting to.
　このようにすれば、特に高いＱ値を確保することができるので、アンテナの通信性能を良好にできる。 In this way, since a particularly high Q value can be secured, the communication performance of the antenna can be improved.
　また、本発明の一態様では、前記アンテナコイルは、前記一方側部に周回する前記導線のピッチが前記他方側部に周回する前記導線のピッチと異なる大きさとなっていることとしてもよい。 Further, in one aspect of the present invention, the antenna coil may have a pitch different from a pitch of the conducting wire that circulates to the one side portion as a pitch of the conducting wire that circulates to the other side portion.
　このようにすれば、一方側部と他方側部のインダクタンスの大きさに差をつけられるので、アンテナコイルの一方側部と他方側部の誘起電圧が互いに打ち消し合うことによる通信性能の劣化を低減できる。 In this way, the difference in inductance between the one side and the other side can be made different, so that the deterioration in communication performance due to the induced voltages of the one side and the other side of the antenna coil canceling each other is reduced. it can.
　また、本発明の一態様では、前記アンテナコイルは、前記導線を略短冊形状に巻回して設けられる構成となっていることとしてもよい。 Further, in one aspect of the present invention, the antenna coil may be configured to be provided by winding the conducting wire in a substantially strip shape.
　このようにすれば、特に、アンテナコイルを細長く略短冊形状に導線を巻回した構成とした場合でも、金属板による磁気シールド効果を利用して、アンテナコイルの一方側部と他方側部の誘起電圧が互いに打ち消し合うことによる通信性能の劣化を低減して、良好な通信特性が得られる。 In this way, in particular, even when the antenna coil has a configuration in which a conductive wire is wound in an elongated and substantially strip shape, the induction of the one side and the other side of the antenna coil is achieved by utilizing the magnetic shielding effect of the metal plate. Good communication characteristics can be obtained by reducing deterioration in communication performance due to voltage canceling each other.
　また、本発明の他の態様は、前述した何れかのアンテナ装置が組み込まれ、外部機器と電磁界信号を介して通信可能な電子機器である。 Another aspect of the present invention is an electronic device in which any of the antenna devices described above is incorporated and can communicate with an external device via an electromagnetic field signal.
　本発明の他の態様によれば、アンテナのＱ値の低減を抑制することによって、外部機器に対する電子機器の良好なアンテナ通信特性を確保することができる。 According to another aspect of the present invention, good antenna communication characteristics of an electronic device with respect to an external device can be ensured by suppressing a reduction in the Q value of the antenna.
　以上説明したように本発明によれば、磁性シートの端部をアンテナコイルの端部からずらすことによって、金属板による磁気シールド効果を利用した小型ＮＦＣアンテナの抵抗を低減させて、Ｑ値の低減を抑制するので、アンテナの良好な通信性能を確保できる。 As described above, according to the present invention, the end of the magnetic sheet is shifted from the end of the antenna coil, thereby reducing the resistance of the small NFC antenna using the magnetic shield effect by the metal plate and reducing the Q value. Therefore, good communication performance of the antenna can be ensured.
本発明の一実施形態に係るアンテナ装置が適用される無線通信システムの概略構成を示す斜視図である。1 is a perspective view illustrating a schematic configuration of a wireless communication system to which an antenna device according to an embodiment of the present invention is applied. 図２Ａは、本発明の一実施形態に係るアンテナ装置を備える電子機器の一例を示す斜視図であり、図２Ｂは、本発明の一実施形態に係るアンテナ装置の配置を説明するための断面図である。FIG. 2A is a perspective view illustrating an example of an electronic apparatus including the antenna device according to the embodiment of the present invention, and FIG. 2B is a cross-sectional view for explaining the arrangement of the antenna device according to the embodiment of the present invention. It is. 図３Ａは、本発明の一実施形態に係るアンテナ装置の概略構成を示す斜視図であり、図３Ｂは、本発明の一実施形態に係るアンテナ装置の概略構成を示す断面図である。FIG. 3A is a perspective view illustrating a schematic configuration of an antenna device according to an embodiment of the present invention, and FIG. 3B is a cross-sectional view illustrating a schematic configuration of the antenna device according to an embodiment of the present invention. 図４Ａは、本発明の他の実施形態に係るアンテナ装置の概略構成を示す斜視図であり、図４Ｂは、本発明の他の実施形態に係るアンテナ装置の概略構成を示す断面図である。4A is a perspective view illustrating a schematic configuration of an antenna device according to another embodiment of the present invention, and FIG. 4B is a cross-sectional view illustrating a schematic configuration of an antenna device according to another embodiment of the present invention. 図５Ａは、本発明の他の実施形態に係るアンテナ装置の概略構成を示す斜視図であり、図５Ｂは、本発明の他の実施形態に係るアンテナ装置の概略構成を示す断面図である。FIG. 5A is a perspective view illustrating a schematic configuration of an antenna device according to another embodiment of the present invention, and FIG. 5B is a cross-sectional view illustrating a schematic configuration of the antenna device according to another embodiment of the present invention. 図６Ａは、本発明の他の実施形態に係るアンテナ装置の概略構成を示す斜視図であり、図６Ｂは、本発明の他の実施形態に係るアンテナ装置の概略構成を示す断面図である。FIG. 6A is a perspective view showing a schematic configuration of an antenna device according to another embodiment of the present invention, and FIG. 6B is a cross-sectional view showing a schematic configuration of the antenna device according to another embodiment of the present invention. 図７Ａは、本発明の他の実施形態に係るアンテナ装置の概略構成を示す斜視図であり、図７Ｂは、本発明の他の実施形態に係るアンテナ装置の概略構成を示す断面図である。FIG. 7A is a perspective view illustrating a schematic configuration of an antenna device according to another embodiment of the present invention, and FIG. 7B is a cross-sectional view illustrating a schematic configuration of the antenna device according to another embodiment of the present invention. 図８Ａは、本発明の一実施形態に係るアンテナ装置の比較例となる従来のアンテナ装置の概略構成を示す斜視図であり、図８Ｂは、当該比較例におけるアンテナ装置の磁界強度を示す断面図である。FIG. 8A is a perspective view showing a schematic configuration of a conventional antenna device as a comparative example of the antenna device according to one embodiment of the present invention, and FIG. 8B is a cross-sectional view showing the magnetic field strength of the antenna device in the comparative example. It is. 図９Ａは、本発明の一実施形態に係るアンテナ装置の実施例の概略構成を示す斜視図であり、図９Ｂは、当該実施例におけるアンテナ装置の磁界強度を示す断面図である。FIG. 9A is a perspective view illustrating a schematic configuration of an example of an antenna device according to an embodiment of the present invention, and FIG. 9B is a cross-sectional view illustrating the magnetic field strength of the antenna device according to the example. 図１０Ａは、本発明の一実施形態に係るアンテナ装置の他の実施例の概略構成を示す斜視図であり、図１０Ｂは、当該他の実施例におけるアンテナ装置の磁界強度を示す断面図である。FIG. 10A is a perspective view illustrating a schematic configuration of another example of the antenna device according to the embodiment of the present invention, and FIG. 10B is a cross-sectional view illustrating the magnetic field strength of the antenna device according to the other example. . 図１１Ａは、本発明の一実施形態に係るアンテナ装置の作用・効果を確認するための評価試験を説明するための斜視図であり、図１１Ｂは、本発明の一実施形態に係るアンテナ装置の作用・効果を確認するための評価試験を説明するための断面図である。FIG. 11A is a perspective view for explaining an evaluation test for confirming the operation / effect of the antenna device according to the embodiment of the present invention, and FIG. 11B is a diagram of the antenna device according to the embodiment of the present invention. It is sectional drawing for demonstrating the evaluation test for confirming an effect | action and an effect. 本発明の一実施形態に係るアンテナ装置の作用・効果を確認するための評価試験における評価結果を示すグラフである。It is a graph which shows the evaluation result in the evaluation test for confirming the effect | action and effect of the antenna apparatus which concerns on one Embodiment of this invention.
　以下、本発明の好適な実施の形態について詳細に説明する。なお、以下に説明する本実施形態は、特許請求の範囲に記載された本発明の内容を不当に限定するものではなく、本実施形態で説明される構成の全てが本発明の解決手段として必須であるとは限らない。 Hereinafter, preferred embodiments of the present invention will be described in detail. The present embodiment described below does not unduly limit the contents of the present invention described in the claims, and all the configurations described in the present embodiment are essential as means for solving the present invention. Not necessarily.
　まず、本発明の一実施形態に係るアンテナ装置の構成について、図面を使用しながら説明する。図１は、本発明の一実施形態に係るアンテナ装置が適用される無線通信システムの概略構成を示す斜視図であり、図２Ａは、本発明の一実施形態に係るアンテナ装置を備える電子機器の一例を示す斜視図であり、図２Ｂは、本発明の一実施形態に係るアンテナ装置の配置を説明するための断面図である。 First, the configuration of an antenna device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view illustrating a schematic configuration of a wireless communication system to which an antenna device according to an embodiment of the present invention is applied, and FIG. 2A is an electronic device including the antenna device according to an embodiment of the present invention. It is a perspective view which shows an example, FIG. 2: B is sectional drawing for demonstrating arrangement | positioning of the antenna apparatus which concerns on one Embodiment of this invention.
　本実施形態に係るアンテナ装置１は、電子機器３０に組み込まれ、外部機器と電磁界信号を介して通信する装置であって、例えば、図１に示すようなＲＦＩＤ用の無線通信システム１００に組み込まれて使用される。 The antenna device 1 according to the present embodiment is a device that is incorporated in an electronic device 30 and communicates with an external device via an electromagnetic field signal. For example, the antenna device 1 is incorporated in an RFID wireless communication system 100 as shown in FIG. Used.
　無線通信システム１００は、図１に示すように、電子機器３０に備わるアンテナ装置１と、アンテナ装置１に対するアクセスを行う外部機器となるリーダライタ４０とを含む。ここで、アンテナ装置１とリーダライタ４０とは、図１に示す三次元直交座標系ＸＹＺのＸＹ平面において互いに対向するように配置されているものとする。 As shown in FIG. 1, the wireless communication system 100 includes an antenna device 1 provided in an electronic device 30 and a reader / writer 40 serving as an external device that accesses the antenna device 1. Here, it is assumed that the antenna device 1 and the reader / writer 40 are arranged to face each other on the XY plane of the three-dimensional orthogonal coordinate system XYZ shown in FIG.
　リーダライタ４０は、ＸＹ平面において互いに対向するアンテナ装置１に対して、Ｚ軸方向に磁界を発信する発信器として機能し、具体的には、アンテナ装置１に向けて磁界を発信するアンテナ４１と、アンテナ４１を介して誘導結合されたアンテナ装置１と通信を行う制御基板４２とを備える。 The reader / writer 40 functions as a transmitter that transmits a magnetic field in the Z-axis direction to the antenna devices 1 that face each other in the XY plane, and specifically, an antenna 41 that transmits a magnetic field toward the antenna device 1 And a control board 42 that communicates with the antenna device 1 that is inductively coupled via the antenna 41.
　すなわち、リーダライタ４０は、アンテナ４１と電気的に接続された制御基板４２が配設されている。この制御基板４２には、一又は複数の集積回路チップ等の電子部品からなる制御回路４３が実装されている。この制御回路４３は、アンテナ装置１から受信されたデータに基づいて、各種の処理を実行する。 That is, the reader / writer 40 is provided with a control board 42 electrically connected to the antenna 41. A control circuit 43 made of electronic components such as one or a plurality of integrated circuit chips is mounted on the control board 42. The control circuit 43 executes various processes based on the data received from the antenna device 1.
　例えば、制御回路４３は、アンテナ装置１に対してデータを送信する場合、データを符号化し、符号化したデータに基づいて、所定の周波数（例えば、１３．５６ＭＨｚ）の搬送波を変調し、変調した変調信号を増幅し、増幅した変調信号でアンテナ４１を駆動する。また、制御回路４３は、アンテナ装置１からデータを読み出す場合、アンテナ４１で受信されたデータの変調信号を増幅し、増幅したデータの変調信号を復調し、復調したデータを復号する。 For example, when transmitting data to the antenna device 1, the control circuit 43 encodes the data, modulates a carrier wave of a predetermined frequency (for example, 13.56 MHz) based on the encoded data, and modulates the data. The modulated signal is amplified, and the antenna 41 is driven by the amplified modulated signal. In addition, when reading data from the antenna device 1, the control circuit 43 amplifies the modulation signal of the data received by the antenna 41, demodulates the modulation signal of the amplified data, and decodes the demodulated data.
　なお、制御回路４３では、一般的なリーダライタで用いられる符号化方式及び変調方式が用いられ、例えば、マンチェスタ符号化方式やＡＳＫ（Amplitude Shift Keying）変調方式が用いられている。また、以下では、非接触通信システムにおけるアンテナ装置等について説明をするが、Ｑｉ（チー）等の非接触充電システムについても同様に適用することができるものとする。 The control circuit 43 uses an encoding method and a modulation method used in a general reader / writer. For example, a Manchester encoding method or an ASK (Amplitude Shift Keying) modulation method is used. In the following description, the antenna device and the like in the non-contact communication system will be described, but the same can be applied to a non-contact charging system such as Qi (Chi).
　アンテナ装置１は、例えば、リーダライタ４０とＸＹ平面において対向するように配置される携帯電話機等の電子機器３０の筐体３２の内部に組み込まれる。本実施形態では、アンテナ装置は、誘導結合されたリーダライタ４０との間で通信可能となるアンテナコイル１２が実装されたアンテナ基板１１（図２Ａ参照）を有するアンテナモジュール２と、アンテナコイル１２に流れる電流により駆動し、リーダライタ４０との間で通信を行う通信処理部１３と、金属板３とを備える。 The antenna device 1 is incorporated into a housing 32 of an electronic device 30 such as a mobile phone that is disposed so as to face the reader / writer 40 in the XY plane, for example. In the present embodiment, the antenna device includes an antenna module 2 having an antenna substrate 11 (see FIG. 2A) on which an antenna coil 12 capable of communicating with an inductively coupled reader / writer 40 is mounted. A communication processing unit 13 that is driven by a flowing current and performs communication with the reader / writer 40 and the metal plate 3 are provided.
　アンテナモジュール２は、電子機器３０の筐体３２（図２Ａ参照）の内部に設けられ、誘導結合されたリーダライタ４０との間で通信を行う。本実施形態では、図１に示すように、アンテナモジュール２は、アンテナ基板１１と、通信処理部１３と、接続部１４とを備える。 The antenna module 2 is provided inside the housing 32 (see FIG. 2A) of the electronic device 30 and communicates with the reader / writer 40 that is inductively coupled. In the present embodiment, as shown in FIG. 1, the antenna module 2 includes an antenna substrate 11, a communication processing unit 13, and a connection unit 14.
　アンテナ基板１１には、例えばフレキシブルフラットケーブルなどの可撓性の導線１２ａがパターンニング処理などをすることによって形成されるアンテナコイル１２と、アンテナコイル１２と通信処理部１３とを電気的に接続する端子部１４とが実装されている。 For example, an antenna coil 12 formed by performing a patterning process or the like on a flexible conductive wire 12 a such as a flexible flat cable, and the antenna coil 12 and the communication processing unit 13 are electrically connected to the antenna substrate 11. A terminal portion 14 is mounted.
　アンテナコイル１２は、リーダライタ４０から発信される磁界を受けると、リーダライタ４０と誘導結合によって磁気的に結合され、変調された電磁波を受信して、端子部１４を介して受信信号を通信処理部１３に供給する機能を有する。アンテナコイル１２は、図２Ａに示すように略短冊形状をなし、外形に沿ってアンテナコイル１２の１本の導線１２ａが周回されており、その中心側が開口部１２ｂとなっている。すなわち、アンテナコイル１２は、その開口部１２ｂを介して幅方向（図２Ａに示すＸ方向）に対向する導線１２ａが互いに近接するように巻回して設けられる。また、アンテナコイル１２は、導線１２ａが周回する主面が通信時にリーダライタ４０と図１に示すＸＹ平面において対向するように配置される。 When the antenna coil 12 receives a magnetic field transmitted from the reader / writer 40, the antenna coil 12 is magnetically coupled to the reader / writer 40 by inductive coupling, receives the modulated electromagnetic wave, and performs communication processing of the received signal via the terminal unit 14. It has a function of supplying to the unit 13. As shown in FIG. 2A, the antenna coil 12 has a substantially strip shape, and one conductor 12a of the antenna coil 12 is circulated along the outer shape, and the center side is an opening 12b. That is, the antenna coil 12 is provided by being wound so that the conducting wires 12a facing each other in the width direction (X direction shown in FIG. 2A) are close to each other through the opening 12b. The antenna coil 12 is arranged so that the main surface around which the conducting wire 12a circulates opposes the reader / writer 40 in the XY plane shown in FIG. 1 during communication.
　通信処理部１３は、アンテナコイル１２に流れる電流により駆動し、リーダライタ４０との間で通信を行う。具体的に、通信処理部１３は、受信された変調信号を復調し、復調したデータを復号して、復号したデータを、当該通信処理部１３が有する内部メモリに書き込む。また、通信処理部１３は、リーダライタ４０に送信するデータを内部メモリから読み出し、読み出したデータを符号化し、符号化したデータに基づいて搬送波を変調し、誘導結合によって磁気的に結合されたアンテナコイル１２を介して変調された電波をリーダライタ４０に送信する。なお、通信処理部１３は、アンテナコイル１２に流れる電力ではなく、電子機器内に組み込まれたバッテリパックや外部電源などの電力供給手段から供給された電力によって駆動してもよい。 The communication processing unit 13 is driven by the current flowing through the antenna coil 12 and communicates with the reader / writer 40. Specifically, the communication processing unit 13 demodulates the received modulation signal, decodes the demodulated data, and writes the decoded data in the internal memory of the communication processing unit 13. The communication processing unit 13 reads the data to be transmitted to the reader / writer 40 from the internal memory, encodes the read data, modulates the carrier wave based on the encoded data, and is magnetically coupled by inductive coupling. The radio wave modulated through the coil 12 is transmitted to the reader / writer 40. Note that the communication processing unit 13 may be driven not by power flowing through the antenna coil 12 but by power supplied from a power supply unit such as a battery pack or an external power source incorporated in the electronic device.
　金属板３は、電子機器３０の筐体３２内に設けられ、外部機器となるリーダライタ４０に対向する第１の導電体となる。金属板３は、例えば、携帯電話やスマートフォン、又はタブレットＰＣ等の電子機器の筐体内に設けられ、アンテナモジュール２の通信時にリーダライタ４０に対向する第１の導電体を構成するものである。当該第１の導電体として、例えば、スマートフォンの筐体の内面に貼付されたメタルカバーや、スマートフォン内に収納されたバッテリパックの金属筐体、あるいは、タブレットＰＣの液晶モジュールの裏面に設けられた金属板等が相当する。 The metal plate 3 is provided in the housing 32 of the electronic device 30 and serves as a first conductor facing the reader / writer 40 serving as an external device. The metal plate 3 is provided in a housing of an electronic device such as a mobile phone, a smartphone, or a tablet PC, for example, and constitutes a first conductor that faces the reader / writer 40 during communication of the antenna module 2. As the first conductor, for example, a metal cover affixed to the inner surface of the smartphone casing, a metal casing of a battery pack stored in the smartphone, or the back surface of the liquid crystal module of the tablet PC Corresponds to a metal plate or the like.
　バッテリパック等の金属板３は、電気を比較的よく流すので、外部から交流磁界が加わると渦電流が発生し、磁界を跳ね返してしまう。このような外部から交流磁界が加わるときの磁界分布を調べると、リーダライタ４０と対向した金属板３の端部３ａの磁界が強いという特性を有する。このため、本実施形態では、アンテナモジュール２のアンテナコイル１２を携帯電話機３０の筐体３２内部に設けられたバッテリパック等の金属板３の外縁側に設けている。このように、アンテナコイル１２を金属板３の外縁側に設けることによって、携帯電話機等の電子機器３０に組み込んだ際に当該電子機器３０の小型化を図りつつ、リーダライタ４０との間で良好な通信特性が実現される。 Since the metal plate 3 such as a battery pack flows electricity relatively well, when an AC magnetic field is applied from the outside, an eddy current is generated and the magnetic field is rebounded. Examining the magnetic field distribution when an AC magnetic field is applied from the outside, the magnetic field at the end 3a of the metal plate 3 facing the reader / writer 40 is strong. For this reason, in this embodiment, the antenna coil 12 of the antenna module 2 is provided on the outer edge side of the metal plate 3 such as a battery pack provided in the housing 32 of the mobile phone 30. As described above, by providing the antenna coil 12 on the outer edge side of the metal plate 3, the electronic device 30 can be reduced in size when incorporated in the electronic device 30 such as a cellular phone, and can be favorably connected to the reader / writer 40. Communication characteristics are realized.
　本実施形態では、アンテナコイル１２は、例えば、図２Ａに示すような三次元直交座標系ＸＹＺのＸＹ平面上であって、携帯電話機３０の筐体３２内部に設けられたバッテリパック等の金属板３と、筐体３２の内周壁３２ａとの間に配置される。なお、アンテナコイル１２は、上記のように金属板３と筐体３２の内周壁３２ａとの間だけでなく、例えば、集積回路基板などの筐体内部に配置された導電体と筐体の内周壁との隙間に設けるようにしてもよい。 In the present embodiment, the antenna coil 12 is, for example, a metal plate such as a battery pack provided on the XY plane of the three-dimensional orthogonal coordinate system XYZ as shown in FIG. 3 and the inner peripheral wall 32 a of the housing 32. The antenna coil 12 is not only between the metal plate 3 and the inner peripheral wall 32a of the casing 32 as described above, but also, for example, an electric conductor disposed inside the casing such as an integrated circuit board and the inside of the casing. You may make it provide in the clearance gap with a surrounding wall.
　また、本実施形態では、図２Ｂに示すように、アンテナ基板１１上に形成されるアンテナコイル１２の外部機器４０との対向面と反対側の面に、少なくとも当該アンテナコイルの一部と重畳するように、磁性シート２０がアンテナコイル１２の開口部１２ｂを貫通して設けられる。磁性シート２０は、酸化鉄や酸化クロム、コバルト、フェライト等の磁性体から形成され、アンテナモジュール２の通信特性を高めるために、当該アンテナモジュール２の通信時にリーダライタ４０から送られる磁束をアンテナコイル１２の中心側に向けて誘導する機能を有する。 In the present embodiment, as shown in FIG. 2B, at least a part of the antenna coil is superimposed on the surface of the antenna coil 12 formed on the antenna substrate 11 opposite to the surface facing the external device 40. As described above, the magnetic sheet 20 is provided so as to penetrate the opening 12 b of the antenna coil 12. The magnetic sheet 20 is formed of a magnetic material such as iron oxide, chromium oxide, cobalt, or ferrite, and in order to improve the communication characteristics of the antenna module 2, a magnetic flux sent from the reader / writer 40 during communication of the antenna module 2 is used as an antenna coil. 12 has a function of guiding toward the center side.
　さらに、本実施形態では、アンテナコイル１２は、その長手方向に開口部１２ｂを縦断する中心線Ｌ１を介して導線１２ａが一方向に周回する一方側部１２ａ１と導線１２ａが他方向に周回する他方側部１２ａ２に二分されている。そして、図２Ｂに示すように、一方側部１２ａ１が外部機器４０との対向面と反対側の面で磁性シート２０と重畳し、他方側部１２ａ２が当該対向面で磁性シート２０と重畳し、かつ、他方側部１２ａ２と重畳する磁性シート２０の端部２０ｃがアンテナコイル１２の他方側部１２ａ２の端部１２ｃよりも開口部１２ｂ側にずれるように構成されることを特徴とする。なお、アンテナコイル１２の構成の詳細な説明については、後述する。 Further, in the present embodiment, the antenna coil 12 includes the one side portion 12a1 in which the conducting wire 12a circulates in one direction and the other in which the conducting wire 12a circulates in the other direction via the center line L1 that vertically cuts the opening 12b in the longitudinal direction. Divided into side parts 12a2. And as shown in FIG. 2B, the one side portion 12a1 overlaps with the magnetic sheet 20 on the surface opposite to the surface facing the external device 40, and the other side portion 12a2 overlaps with the magnetic sheet 20 on the facing surface. And it is comprised so that the edge part 20c of the magnetic sheet 20 superimposed on the other side part 12a2 may shift | deviate from the edge part 12c of the other side part 12a2 of the antenna coil 12 to the opening part 12b side. A detailed description of the configuration of the antenna coil 12 will be given later.
　次に、本発明の一実施形態に係るアンテナ装置の概略構成について、図面を使用しながら説明する。図３Ａは、本発明の一実施形態に係るアンテナ装置の概略構成を示す斜視図であり、図３Ｂは、本発明の一実施形態に係るアンテナ装置の概略構成を示す断面図である。なお、図３Ａ及び図３Ｂでは、図２Ｂに示すアンテナ基板１１を省略して図示しているものとする。 Next, a schematic configuration of an antenna device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 3A is a perspective view illustrating a schematic configuration of an antenna device according to an embodiment of the present invention, and FIG. 3B is a cross-sectional view illustrating a schematic configuration of the antenna device according to an embodiment of the present invention. In FIGS. 3A and 3B, the antenna substrate 11 shown in FIG. 2B is omitted.
　本実施形態に係るアンテナ装置１は、図３Ａ、図３Ｂに示すように、アンテナコイル１２が導線１２ａを略短冊形状に巻回して設けられる構成となっている。すなわち、アンテナコイル１２は、その開口部１２ｂを介して幅方向（図３Ａに示すＸ方向）に対向する導線１２ａが互いに近接するように巻回して設けられ、長手方向（図３Ａに示すＹ方向）に展開するように長尺化した形状となっている。また、アンテナコイル１２は、その長手方向に開口部１２ｂを縦断する直線である中心線Ｌ１を介して導線１２ａが一方向（図３Ａ、図３Ｂに示すＹ軸正方向）に周回する一方側部１２ａ１と、導線１２が他方向（図３Ａ、図３Ｂに示すＹ軸負方向）に周回する他方側部１２ａ２に二分される。 As shown in FIGS. 3A and 3B, the antenna device 1 according to the present embodiment has a configuration in which an antenna coil 12 is provided by winding a conducting wire 12a in a substantially strip shape. That is, the antenna coil 12 is provided by being wound so that the conductors 12a facing each other in the width direction (X direction shown in FIG. 3A) are close to each other through the opening 12b, and the longitudinal direction (Y direction shown in FIG. 3A). ) Is a long shape so as to expand. Further, the antenna coil 12 has one side portion in which the conducting wire 12a circulates in one direction (the Y-axis positive direction shown in FIGS. 3A and 3B) via a center line L1 that is a straight line that cuts through the opening 12b in the longitudinal direction. 12a1 and the conducting wire 12 are divided into two sides 12a2 which circulate in the other direction (Y-axis negative direction shown in FIGS. 3A and 3B).
　アンテナコイル１２のリーダライタ４０（図１参照）との対向面と反対側には、少なくともフェライト等の磁性体からなる磁性シート２０がアンテナコイル１２の一部と重畳するように、アンテナコイル１２の開口部１２ｂを貫通して設けられる。本実施形態では、アンテナコイル１２を細長く略短冊形状に導線１２ａを巻回した構成とした場合でも、金属板３による磁気シールド効果を利用して、アンテナコイル１２の一方側部１２ａ１と他方側部１２ａ２の誘起電圧が互いに打ち消し合うことによる通信性能の劣化を低減させるために、磁性シート２０をアンテナコイル１２の開口部１２ｂを貫通して設けることによって、良好なアンテナの通信特性を確保している。 On the side of the antenna coil 12 opposite to the surface facing the reader / writer 40 (see FIG. 1), at least the magnetic sheet 20 made of a magnetic material such as ferrite is superimposed on a part of the antenna coil 12. It is provided through the opening 12b. In the present embodiment, even when the antenna coil 12 is configured to be an elongated and substantially strip-shaped conductor wire 12a, the one side portion 12a1 and the other side portion of the antenna coil 12 are utilized by utilizing the magnetic shielding effect of the metal plate 3. In order to reduce the deterioration of the communication performance due to the induced voltages of 12a2 canceling each other, the magnetic sheet 20 is provided through the opening 12b of the antenna coil 12 to ensure good antenna communication characteristics. .
　本発明者は、前述した本発明の目的を達成するために鋭意検討を重ねた結果、磁性シート２０の端部２０ｃをアンテナコイル１２の端部１２ｃからずらすことによって、金属板３による磁気シールド効果を利用したアンテナの抵抗を低減させるので、Ｑ値の低減を抑制できることを見出した。なお、Ｑ値は、アンテナコイル１２を流れる電流の角周波数をω（ω＝２πｆ：ｆ＝アンテナコイルを流れる電流の周波数）、アンテナコイルのインダクタンスをＬ、アンテナコイル１２の損失を含む抵抗をＲとすると、ωＬ／Ｒで表される。 As a result of intensive studies to achieve the above-described object of the present invention, the present inventor has shifted the end 20c of the magnetic sheet 20 from the end 12c of the antenna coil 12 to thereby achieve the magnetic shielding effect by the metal plate 3. It has been found that the reduction of the Q value can be suppressed because the resistance of the antenna using the antenna is reduced. The Q value is the angular frequency of the current flowing through the antenna coil 12 ω (ω = 2πf: f = the frequency of the current flowing through the antenna coil), the inductance of the antenna coil L, and the resistance including the loss of the antenna coil R R Then, it is represented by ωL / R.
　本実施形態では、アンテナ装置１は、図３Ａ及び図３Ｂに示すように、アンテナコイル１２の一方側部１２ａ１がリーダライタ４０との対向面と反対側の面で磁性シート２０と重畳し、他方側部１２ａ２が当該対向面で磁性シート２０と重畳した構成となっている。そして、本実施形態のアンテナ装置１は、他方側部１２ａ２と重畳する磁性シート２０の端部２０ｃがアンテナコイル１２の他方側部１２ａ２の端部１２ｃよりも開口部１２ｂ側にずれるように構成されていることを特徴とする。 In the present embodiment, as shown in FIGS. 3A and 3B, the antenna device 1 has one side portion 12a1 of the antenna coil 12 superimposed on the magnetic sheet 20 on the surface opposite to the surface facing the reader / writer 40, and the other side. The side portion 12a2 is configured to overlap the magnetic sheet 20 on the facing surface. The antenna device 1 of the present embodiment is configured such that the end portion 20c of the magnetic sheet 20 overlapping the other side portion 12a2 is shifted to the opening 12b side from the end portion 12c of the other side portion 12a2 of the antenna coil 12. It is characterized by.
　具体的には、アンテナコイル１２を磁性シート２０より幅方向に大きい構成、又は磁性シート２０をアンテナコイル１２より幅方向に小さい構成にすることによって、磁性シート２０の端部２０ｃをアンテナコイル１２の他方側部１２ａ２の端部１２ｃよりも開口部１２ｂ側にずらした構成となっている。なお、ここで言及する「幅方向」とは、アンテナコイル１２の長手方向（図３ＡにおけるＹ軸方向）に対する幅方向（図３ＡにおけるＸ軸方向）を示す。 Specifically, the antenna coil 12 is configured to be larger in the width direction than the magnetic sheet 20, or the magnetic sheet 20 is configured to be smaller in the width direction than the antenna coil 12, so that the end 20 c of the magnetic sheet 20 is It is configured to be shifted to the opening 12b side with respect to the end portion 12c of the other side portion 12a2. The “width direction” mentioned here indicates the width direction (X-axis direction in FIG. 3A) with respect to the longitudinal direction (Y-axis direction in FIG. 3A) of the antenna coil 12.
　このように、磁性シート２０の端部２０ｃをアンテナコイル１２の端部１２ｃからずらすことによって、金属板３による磁気シールド効果を利用したアンテナの抵抗を低減させられるので、アンテナのＱ値の低減を抑制できる。このため、良好なアンテナの通信性能を維持することができる。 Thus, by shifting the end 20c of the magnetic sheet 20 from the end 12c of the antenna coil 12, the resistance of the antenna using the magnetic shield effect by the metal plate 3 can be reduced, so that the Q value of the antenna can be reduced. Can be suppressed. For this reason, it is possible to maintain good antenna communication performance.
　特に、本実施形態のアンテナ装置１は、金属板３の端部３ａに長手方向に細長いアンテナコイル１２を置くことによって、アンテナの通信性能を良好にする磁気シールド効果を利用している。このように、アンテナコイル１２を金属板３の近くに置くと、アンテナのＱ値が低下する問題があったが、本実施形態では、アンテナのＱ値の低減を抑制するために、磁性シート２０の端部２０ｃをアンテナコイル１２の端部１２ｃの内側にずらす構成としている。 In particular, the antenna device 1 of the present embodiment uses the magnetic shield effect that improves the communication performance of the antenna by placing the elongated antenna coil 12 in the longitudinal direction on the end 3a of the metal plate 3. As described above, when the antenna coil 12 is placed near the metal plate 3, there is a problem that the Q value of the antenna is lowered. In the present embodiment, in order to suppress the reduction of the Q value of the antenna, the magnetic sheet 20 is used. The end portion 20 c of the antenna coil 12 is shifted to the inside of the end portion 12 c of the antenna coil 12.
　すなわち、電子機器３０に内蔵し、基板等の金属板３の磁気シールド効果による磁束の集中を利用して特性を上げるアンテナモジュール２において、金属板３と対向する面への磁束の広がりを低減させるために、金属板３と対向する部分の磁性シート２０の面積をアンテナコイル１２の面積より小さくしている。特に、磁性シート２０の端部２０ｃをアンテナコイル１２の他方側部１２ａ２の端部１２ｃよりも当該他方側部１２ａ２の幅方向の大きさの半分の距離だけ開口部１２ｂ側にずらすことによって、高いＱ値を確保することができるので、アンテナの通信性能が良好になる。ここで言及する「他方側部１２ａ２の幅方向の大きさの半分の距離」とは、他方側部１２ａ２の幅方向（図３Ｂに示すＸ軸方向）の大きさの５０％前後から６０％程度の略半分の大きさの距離を含むものとする。 That is, in the antenna module 2 that is built in the electronic device 30 and improves the characteristics by using the magnetic flux concentration due to the magnetic shield effect of the metal plate 3 such as a substrate, the spread of the magnetic flux to the surface facing the metal plate 3 is reduced. For this reason, the area of the magnetic sheet 20 facing the metal plate 3 is made smaller than the area of the antenna coil 12. In particular, by shifting the end 20c of the magnetic sheet 20 to the opening 12b side by a distance that is half the size in the width direction of the other side 12a2 from the end 12c of the other side 12a2 of the antenna coil 12, it is high. Since the Q value can be secured, the communication performance of the antenna is improved. The “distance that is half the size of the other side portion 12a2 in the width direction” referred to here is about 50% to about 60% of the size of the other side portion 12a2 in the width direction (X-axis direction shown in FIG. 3B). It is assumed that the distance of about half the size is included.
　なお、本発明の一実施形態に係るアンテナ装置１は、アンテナコイル１２の導線１２ａのピッチが一方側部１２ａ１と他方側部１２ａ２でそれぞれ等間隔であるため、一方側部１２ａ１と他方側部１２ａ２の面積が略同一の大きさとなっている。しなしながら、本発明の一実施形態に係るアンテナ装置１は、磁性シート２０の端部２０ｃをアンテナコイル１２の端部１２ｃの内側にずらす構成となっていれば、かかる場合に限定されない。 In the antenna device 1 according to the embodiment of the present invention, the pitch of the conductor 12a of the antenna coil 12 is equal between the one side portion 12a1 and the other side portion 12a2, so that the one side portion 12a1 and the other side portion 12a2 are the same. Are substantially the same size. However, the antenna device 1 according to the embodiment of the present invention is not limited to such a case as long as the end 20c of the magnetic sheet 20 is configured to be shifted to the inside of the end 12c of the antenna coil 12.
　例えば、図４Ａ及び図４Ｂに示すように、開口部１１２ｂに磁性シート１２０を貫通させたアンテナコイル１１２の導線１１２ａのピッチが一方側部１１２ａ１より他方側部１１２ａ２の方を小さくして、かつ磁性シート１２０の他方側部１１２ａ２と重畳する部分の面積も小さくしてもよい。このように、一方側部１１２ａ１と他方側部１１２ａ２の導線１１２ａのピッチ間隔を変えて、他方側部１１２ａ２の方が一方側部１１２ａ１よりも面積を小さくした場合でも、磁性シート１２０の端部１２０ｃをアンテナコイル１１２の端部１１２ｃの内側にずらす構成となっていれば、アンテナのＱ値の低減を抑制できる。 For example, as shown in FIG. 4A and FIG. 4B, the pitch of the conducting wire 112a of the antenna coil 112 having the magnetic sheet 120 penetrated through the opening 112b is smaller on the other side 112a2 than on the one side 112a1, and is magnetic. The area of the portion overlapping the other side portion 112a2 of the sheet 120 may also be reduced. As described above, even when the pitch interval between the conductive wires 112a of the one side portion 112a1 and the other side portion 112a2 is changed and the area of the other side portion 112a2 is smaller than that of the one side portion 112a1, the end portion 120c of the magnetic sheet 120 is used. Can be suppressed to the inside of the end 112c of the antenna coil 112, the reduction of the Q value of the antenna can be suppressed.
　また、図５Ａ及び図５Ｂに示すように、開口部２１２ｂに磁性シート２２０を貫通させたアンテナコイル２１２の導線２１２ａのピッチが一方側部２１２ａ１より他方側部２１２ａ２の方が大きくしてもよい。このように、一方側部２１２ａ１と他方側部２１２ａ２の導線２１２ａのピッチ間隔を変えて、他方側部２１２ａ２の方が一方側部２１２ａ１よりも面積を大きくした場合でも、磁性シート２２０の端部２２０ｃをアンテナコイル２１２の端部２１２ｃの内側にずらす構成となっていれば、アンテナのＱ値の低減を抑制できる。 Further, as shown in FIGS. 5A and 5B, the pitch of the conductor 212a of the antenna coil 212 having the magnetic sheet 220 penetrated through the opening 212b may be larger on the other side 212a2 than on the first side 212a1. Thus, even when the pitch interval between the conductive wires 212a of the one side portion 212a1 and the other side portion 212a2 is changed and the area of the other side portion 212a2 is larger than that of the one side portion 212a1, the end portion 220c of the magnetic sheet 220 is obtained. Can be suppressed to the inside of the end 212c of the antenna coil 212, the reduction of the Q value of the antenna can be suppressed.
　さらに、図６Ａ及び図６Ｂに示すように、開口部３１２ｂに磁性シート３２０を貫通させたアンテナコイル３１２の導線３１２ａのピッチが一方側部３１２ａ１より他方側部３１２ａ２の方が大きくして、かつ磁性シート３２０の一方側部３１２ａ１と他方側部３１２ａ２と重畳する部分の面積をそれぞれ同じにしてもよい。このように、一方側部３１２ａ１と他方側部３１２ａ２の導線３１２ａのピッチ間隔を変えて、他方側部３１２ａ２の方を一方側部３１２ａ１よりも面積を大きくした場合でも、磁性シート３２０の端部３２０ｃをアンテナコイル３１２の端部３１２ｃの内側にずらす構成となっていれば、アンテナのＱ値の低減を抑制できる。 Further, as shown in FIGS. 6A and 6B, the pitch of the conducting wire 312a of the antenna coil 312 having the opening 312b penetrated by the magnetic sheet 320 is larger on the other side 312a2 than on the one side 312a1, and magnetically The areas of the portions overlapping the one side 312a1 and the other side 312a2 of the sheet 320 may be the same. Thus, even when the pitch interval of the conducting wires 312a of the one side portion 312a1 and the other side portion 312a2 is changed and the area of the other side portion 312a2 is larger than that of the one side portion 312a1, the end portion 320c of the magnetic sheet 320 is provided. Is configured to be shifted to the inside of the end 312c of the antenna coil 312, the reduction in the Q value of the antenna can be suppressed.
　また、図７Ａ及び図７Ｂに示すように、開口部４１２ｂに磁性シート４２０を貫通させたアンテナコイル４１２の導線４１２ａのピッチが一方側部４１２ａ１より他方側部４１２ａ２の方が大きくして、かつ磁性シート４２０と重畳する部分の面積を一方側部４１２ａ１よりも他方側部４１２ａ２の方を大きくしてもよい。このように、一方側部４１２ａ１と他方側部４１２ａ２の導線４１２ａのピッチ間隔を変えて、他方側部４１２ａ２の方を一方側部４１２ａ１よりも面積を大きくして、かつ、磁性シート４２０と重畳する部分の面積を一方側部４１２ａ１よりも他方側部４１２ａ２の方を大きくした場合でも、磁性シート４２０の端部４２０ｃをアンテナコイル４１２の端部４１２ｃの内側にずらす構成となっていれば、アンテナのＱ値の低減を抑制できる。 Further, as shown in FIGS. 7A and 7B, the pitch of the conductor 412a of the antenna coil 412 in which the magnetic sheet 420 is passed through the opening 412b is larger on the other side 412a2 than on the one side 412a1, and magnetically The area of the portion overlapping the sheet 420 may be larger on the other side portion 412a2 than on the one side portion 412a1. In this way, the pitch interval between the conductive wires 412a of the one side portion 412a1 and the other side portion 412a2 is changed so that the area of the other side portion 412a2 is larger than that of the one side portion 412a1 and overlaps the magnetic sheet 420. Even when the area of the portion is larger on the other side portion 412a2 than on the one side portion 412a1, if the end portion 420c of the magnetic sheet 420 is shifted to the inside of the end portion 412c of the antenna coil 412, the antenna Reduction of the Q value can be suppressed.
　これらの本発明の他の実施形態のように、アンテナコイルの一方側部と他方側部の導線のピッチを異なる大きさとして、一方側部と他方側部のインダクタンスの大きさに差をつけられるようにすることによって、アンテナコイルの一方側部と他方側部の誘起電圧が互いに打ち消し合うことによる通信性能の劣化を低減できる。また、その際に、磁性シートの端部をアンテナコイルの端部からずらすことによって、金属板による磁気シールド効果を利用したアンテナの抵抗を低減させるので、Ｑ値の低減を抑制できる。 As in these other embodiments of the present invention, the pitches of the conductors on one side and the other side of the antenna coil are made different sizes, and the magnitude of the inductance on one side and the other side can be made different. By doing so, it is possible to reduce deterioration of communication performance due to the induced voltages of the one side and the other side of the antenna coil canceling each other. Further, at that time, by shifting the end of the magnetic sheet from the end of the antenna coil, the resistance of the antenna using the magnetic shield effect by the metal plate is reduced, so that the reduction of the Q value can be suppressed.
　すなわち、アンテナコイルの中央側の開口部に磁性シートを挿入するＮＦＣアンテナにおいて、アンテナコイルの面積に対して磁性シートの面積を狭めることによって、金属板と対向する面への磁束の広がりを低減させられる。このため、金属板による磁気シールド効果を利用した小型ＮＦＣアンテナの抵抗を低減させることによって、Ｑ値の低減を抑制できるので、良好なアンテナの通信性能を確保できる。 That is, in an NFC antenna in which a magnetic sheet is inserted into the opening on the center side of the antenna coil, by reducing the area of the magnetic sheet relative to the area of the antenna coil, the spread of magnetic flux to the surface facing the metal plate is reduced. It is done. For this reason, since the reduction of the Q value can be suppressed by reducing the resistance of the small NFC antenna using the magnetic shield effect by the metal plate, it is possible to ensure the communication performance of the antenna.
　次に、本発明の一実施形態に係るアンテナ装置の検討評価の実施例について、図面を使用しながら説明する。なお、本発明は、本実施例に限定されるものではない。 Next, an example of examination and evaluation of an antenna device according to an embodiment of the present invention will be described using the drawings. In addition, this invention is not limited to a present Example.
　まず、本発明の一実施形態に係るアンテナ装置の磁性シートの大きさの変化に基づく、磁界強度の検証結果を示す実施例について、図面を使用しながら説明する。図８Ａは、本発明の一実施形態に係るアンテナ装置の比較例となる従来のアンテナ装置の概略構成を示す斜視図であり、図８Ｂは、当該比較例におけるアンテナ装置の磁界強度を示す断面図である。また、図９Ａは、本発明の一実施形態に係るアンテナ装置の実施例の概略構成を示す斜視図であり、図９Ｂは、当該実施例におけるアンテナ装置の磁界強度を示す断面図である。さらに、図１０Ａは、本発明の一実施形態に係るアンテナ装置の他の実施例の概略構成を示す斜視図であり、図１０Ｂは、当該他の実施例におけるアンテナ装置の磁界強度を示す断面図である。 First, an example showing the verification result of the magnetic field strength based on the change in the size of the magnetic sheet of the antenna device according to the embodiment of the present invention will be described with reference to the drawings. FIG. 8A is a perspective view showing a schematic configuration of a conventional antenna device as a comparative example of the antenna device according to one embodiment of the present invention, and FIG. 8B is a cross-sectional view showing the magnetic field strength of the antenna device in the comparative example. It is. FIG. 9A is a perspective view showing a schematic configuration of an example of the antenna device according to one embodiment of the present invention, and FIG. 9B is a cross-sectional view showing the magnetic field strength of the antenna device in the example. 10A is a perspective view illustrating a schematic configuration of another example of the antenna device according to the embodiment of the present invention, and FIG. 10B is a cross-sectional view illustrating the magnetic field strength of the antenna device according to the other example. It is.
　本実施例及び比較例では、ＮＦＣアンテナとして、４０ｍｍ×１２ｍｍで導線５１２ａが４ターンのアンテナコイル５１２の開口部５１２ｂに磁性シート５２０を挿入して、磁性シート５２０（５２１、５２２）の端部５２０ｃをアンテナコイル５１２の端部５１２ｃからずらすことによって、磁性シート５２０の幅（図８に示すＸ軸方向）を変えた場合の磁界強度分布を観察した。具体的には、アンテナコイル５１２と磁性シート５２０の幅がほぼ同等の場合、磁性シートの幅が少し狭い場合（コイル幅１２ｍｍ、磁性シート幅１０ｍｍ）、及び磁性シートの幅をさらに狭めた場合（コイル幅１２ｍｍ、磁性シート幅８ｍｍ）におけるＮＦＣアンテナ（４０ｍｍ×１２ｍｍ、４ターン）の端子に０．０５Ｗの電力を給電した場合における磁界強度の分布を観察した。 In the present example and the comparative example, as the NFC antenna, the magnetic sheet 520 is inserted into the opening 512b of the antenna coil 512 having 40 mm × 12 mm and the conductive wire 512a having four turns, and the end portion 520c of the magnetic sheet 520 (521, 522). The magnetic field strength distribution was observed when the width of the magnetic sheet 520 (X-axis direction shown in FIG. 8) was changed by shifting the distance from the end portion 512c of the antenna coil 512. Specifically, when the widths of the antenna coil 512 and the magnetic sheet 520 are substantially equal, when the width of the magnetic sheet is slightly narrow (coil width 12 mm, magnetic sheet width 10 mm), and when the width of the magnetic sheet is further reduced ( The distribution of magnetic field strength was observed when 0.05 W of power was supplied to the terminals of an NFC antenna (40 mm × 12 mm, 4 turns) in a coil width of 12 mm and a magnetic sheet width of 8 mm.
　アンテナコイル５１２と磁性シート５２０の幅がほぼ同等の場合では、図８Ｂに示すように、アンテナ上面と下面にほぼ同等の磁界の広がりが見える。このため、磁界が拡がったものの下に金属板を持ってきた場合には、その金属板を磁気シールドする効果が金属板に働くので、流れた電流がジュール熱を発して、その分、損失してしまい、アンテナコイルの抵抗が高まる。 In the case where the widths of the antenna coil 512 and the magnetic sheet 520 are substantially the same, as shown in FIG. For this reason, when a metal plate is brought under a magnetic field expansion, the effect of magnetically shielding the metal plate acts on the metal plate, so that the current that flows generates Joule heat and is lost accordingly. As a result, the resistance of the antenna coil increases.
　これに対して、磁性シート５２１の端部５２１ｃをアンテナコイル５１２の端部５１２ｃからずらして磁性シート５２１の幅を少し狭めた場合では、図９Ｂに示すように、アンテナ下面の磁界の広がりが減少して、アンテナコイル５１２の上側に磁界が集中するようになる。さらに、磁性シート５２２の端部５２２ｃをアンテナコイル５１２の端部５１２ｃからずらして磁性シート５２２の幅を更に狭めた場合では、図１０Ｂに示すように、アンテナ下面の磁界の広がりが更に減少して、よりアンテナコイル５１２の上側に磁界が集中するようになる。 On the other hand, when the end portion 521c of the magnetic sheet 521 is shifted from the end portion 512c of the antenna coil 512 and the width of the magnetic sheet 521 is slightly narrowed, as shown in FIG. Thus, the magnetic field is concentrated on the upper side of the antenna coil 512. Furthermore, when the end portion 522c of the magnetic sheet 522 is shifted from the end portion 512c of the antenna coil 512 and the width of the magnetic sheet 522 is further reduced, the spread of the magnetic field on the lower surface of the antenna is further reduced as shown in FIG. 10B. Thus, the magnetic field is more concentrated on the upper side of the antenna coil 512.
　かかる検討結果から、アンテナコイル５１２の端部５１２ｃと磁性シート５２０（５２１、５２２）の端部５２０ｃ（５２１ｃ、５２２ｃ）で磁界の広がりが強まることが分かる。このため、本発明の一実施形態に係るアンテナ装置１では、その磁界の広がりを分散させるために、アンテナコイル１２（図２Ｂ参照）の端部１２ｃと磁性シート２０の端部２０ｃの部分をずらすようにしている。 From this examination result, it can be seen that the spread of the magnetic field is strengthened at the end 512c of the antenna coil 512 and the end 520c (521c, 522c) of the magnetic sheet 520 (521, 522). For this reason, in the antenna device 1 according to the embodiment of the present invention, the end 12c of the antenna coil 12 (see FIG. 2B) and the end 20c of the magnetic sheet 20 are shifted in order to disperse the spread of the magnetic field. I am doing so.
　次に、本発明の一実施形態に係るアンテナ装置の作用・効果を確認するための評価試験について、図面を使用しながら説明する。図１１Ａは、本発明の一実施形態に係るアンテナ装置の作用・効果を確認するための評価試験を説明するための斜視図であり、図１１Ｂは、本発明の一実施形態に係るアンテナ装置の作用・効果を確認するための評価試験を説明するための断面図である。また、図１２は、本発明の一実施形態に係るアンテナ装置の作用・効果を確認するための評価試験における評価結果を示すグラフである。 Next, an evaluation test for confirming the operation and effect of the antenna device according to the embodiment of the present invention will be described with reference to the drawings. FIG. 11A is a perspective view for explaining an evaluation test for confirming the operation / effect of the antenna device according to the embodiment of the present invention, and FIG. 11B is a diagram of the antenna device according to the embodiment of the present invention. It is sectional drawing for demonstrating the evaluation test for confirming an effect | action and an effect. Moreover, FIG. 12 is a graph which shows the evaluation result in the evaluation test for confirming the effect | action and effect of the antenna apparatus which concerns on one Embodiment of this invention.
　この評価試験では、磁性シート６２０によるアンテナＱ値の改善について検討した。具体的には、金属板６０３の外縁側に重畳されたアンテナコイル６１２の開口部６１２ｂに貫通させた磁性シート６２０を端部６２０ｃからカットして、Ｑ値の改善効果を評価した。具体的には、アンテナコイル６１２の大きさを４０ｍｍ×１２ｍｍ、第１の金属板となるアルミ板６０３の大きさを１００ｍｍ×１００ｍｍ×０．３ｍｍとした場合に、図１１Ｂに示すように、磁性シート６２０を端部６２０ｃからカットして、アンテナコイル６２０の端部６２０ｃまでの距離を変更した場合におけるアンテナのＱ値の変化を確認した。 In this evaluation test, improvement of the antenna Q value by the magnetic sheet 620 was examined. Specifically, the magnetic sheet 620 passed through the opening 612b of the antenna coil 612 superimposed on the outer edge side of the metal plate 603 was cut from the end 620c, and the Q value improvement effect was evaluated. Specifically, when the size of the antenna coil 612 is 40 mm × 12 mm and the size of the aluminum plate 603 serving as the first metal plate is 100 mm × 100 mm × 0.3 mm, as shown in FIG. The change of the Q value of the antenna when the sheet 620 was cut from the end 620c and the distance to the end 620c of the antenna coil 620 was changed was confirmed.
　前述した評価試験における評価結果を図１２に示す。図１２に示すように、磁性シート６２０をカットしない場合、すなわち、アンテナコイル６１２と磁性シート６２０の幅がほぼ同等の場合と比べると、磁性シート６２０を端部６２０ｃからカットすると、アンテナのＱ値が上昇することが分かる。しかしながら、磁性シート６２０の端部６２０ｃからのカット幅が３ｍｍより大きくなると、Ｑ値が低下し始めることが分かる。このことから、磁性シート６２０の端部６２０ｃをアンテナコイル６１２の他方側部の端部６１２ｃよりも当該他方側部の幅方向の大きさの半分の距離だけ開口部６１２ｂ側にずらした場合に、最も高いＱ値を確保することができるので、アンテナの通信特性を良好に出来ることが分かる。 FIG. 12 shows the evaluation results in the above-described evaluation test. As shown in FIG. 12, when the magnetic sheet 620 is not cut, that is, compared with the case where the widths of the antenna coil 612 and the magnetic sheet 620 are substantially equal, if the magnetic sheet 620 is cut from the end 620c, the antenna Q value Can be seen to rise. However, it can be seen that when the cut width from the end 620c of the magnetic sheet 620 is larger than 3 mm, the Q value starts to decrease. From this, when the end 620c of the magnetic sheet 620 is shifted to the opening 612b side by a distance half the size in the width direction of the other side than the end 612c of the other side of the antenna coil 612, Since the highest Q value can be secured, it can be seen that the communication characteristics of the antenna can be improved.
　なお、上記のように本発明の各実施形態及び各実施例について詳細に説明したが、本発明の新規事項及び効果から実体的に逸脱しない多くの変形が可能であることは、当業者には、容易に理解できるであろう。従って、このような変形例は、全て本発明の範囲に含まれるものとする。 Although the embodiments and examples of the present invention have been described in detail as described above, it will be understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. It will be easy to understand. Therefore, all such modifications are included in the scope of the present invention.
　例えば、明細書又は図面において、少なくとも一度、より広義又は同義な異なる用語と共に記載された用語は、明細書又は図面のいかなる箇所においても、その異なる用語に置き換えることができる。また、アンテナ装置及び電子機器の構成、動作も本発明の各実施形態及び各実施例で説明したものに限定されず、種々の変形実施が可能である。 For example, a term described together with a different term having a broader meaning or the same meaning at least once in the specification or the drawings can be replaced with the different term in any part of the specification or the drawings. The configurations and operations of the antenna device and the electronic device are not limited to those described in the embodiments and examples of the present invention, and various modifications can be made.
１　アンテナ装置、２　アンテナモジュール、３　金属板（第１の導電体）、３ａ　（金属板の）端部、１１　アンテナ基板、１２、１１２、２１２、３１２、４１２、５１２、６１２　アンテナコイル、１２ａ、１１２ａ、２１２ａ、３１２ａ、４１２ａ、５１２ａ、６１２ａ　導線、１２ａ１、１１２ａ１、２１２ａ１、３１２ａ１、４１２ａ１、５１２ａ１、６１２ａ１　一方側部、１２ａ２、１１２ａ２、２１２ａ２、３１２ａ２、４１２ａ２、５１２ａ２、６１２ａ２　他方側部、１２ｂ、１１２ｂ、２１２ｂ、３１２ｂ、４１２ｂ、５１２ｂ、６１２ｂ　開口部、１２ｃ、１１２ｃ、２１２ｃ、３１２ｃ、４１２ｃ、５１２ｃ、６１２ｃ　（アンテナコイルの）端部、１３　通信処理部、１４　端子部、２０、１２０、２２０、３２０、４２０、５２０、５２１、５２２、６２０　磁性シート、２０ｃ、１２０ｃ、２２０ｃ、３２０ｃ、４２０ｃ、５２０ｃ、５２１ｃ、５２２ｃ、６２０ｃ　（磁性シートの）端部、３０　電子機器、３２　筐体、３２ａ　（筐体の）側壁部、４０　リーダライタ（外部機器）、４１　アンテナ、４２　制御基板、４３　制御回路、Ｌ１　中心線 1 antenna device, 2 antenna module, 3 metal plate (first conductor), 3a (metal plate) end, 11 antenna substrate, 12, 112, 212, 312, 412, 512, 612 antenna coil, 12a, 112a, 212a, 312a, 412a, 512a, 612a Conductor, 12a1, 112a1, 212a1, 312a1, 412a1, 512a1, 612a1, one side, 12a2, 112a2, 212a2, 312a2, 412a2, 512a2, 612a2, the other side, 12b, 112b 212b, 312b, 412b, 512b, 612b opening, 12c, 112c, 212c, 312c, 412c, 512c, 612c (antenna coil) end, 13 communication processing unit, 14 terminal unit, 20, 120, 220, 20, 420, 520, 521, 522, 620 magnetic sheet, 20c, 120c, 220c, 320c, 420c, 520c, 521c, 522c, 620c (magnetic sheet) end, 30 electronic device, 32 housing, 32a (housing) Body side wall, 40 reader / writer (external device), 41 antenna, 42 control board, 43 control circuit, L1 center line

Claims (7)

  1. 　電子機器に組み込まれ、外部機器と電磁界信号を介して通信するアンテナ装置であって、
    　その開口部を介して幅方向に対向する導線が互いに近接するように巻回して設けられ、前記外部機器と誘導結合されるアンテナコイルと、
    　磁性体から形成され、前記アンテナコイルの前記外部機器との対向面と反対側に少なくとも該アンテナコイルの一部と重畳するように前記開口部を貫通して設けられる磁性シートと、を備え、
    　前記アンテナコイルは、その長手方向に前記開口部を縦断する中心線を介して前記導線が一方向に周回する一方側部と前記導線が他方向に周回する他方側部に二分され、前記一方側部が前記対向面と反対側の面で前記磁性シートと重畳し、前記他方側部が前記対向面で前記磁性シートと重畳し、かつ、前記他方側部と重畳する前記磁性シートの端部が前記アンテナコイルの前記他方側部の端部よりも前記開口部側にずれるように構成されるアンテナ装置。     An antenna device incorporated in an electronic device and communicating with an external device via an electromagnetic field signal,
    An antenna coil that is wound around the opening so that the conductors facing in the width direction are close to each other and inductively coupled to the external device;
    A magnetic sheet formed from a magnetic body and provided through the opening so as to overlap at least a part of the antenna coil on a side opposite to the surface of the antenna coil facing the external device,
    The antenna coil is divided into one side portion in which the conducting wire circulates in one direction and a other side portion in which the conducting wire circulates in the other direction via a center line that vertically cuts the opening in the longitudinal direction, and the one side The end portion of the magnetic sheet overlaps the magnetic sheet on the surface opposite to the facing surface, the other side portion overlaps the magnetic sheet on the facing surface, and the other side portion overlaps the magnetic sheet. The antenna apparatus comprised so that it may shift | deviate to the said opening part side rather than the edge part of the said other side part of the said antenna coil.
  2. 　前記アンテナコイルを前記磁性シートより幅方向に大きい構成、又は前記磁性シートを前記アンテナコイルより幅方向に小さい構成にすることによって、前記磁性シートの前記端部を前記アンテナコイルの前記他方側部の前記端部よりも前記開口部側にずらす請求項１に記載のアンテナ装置。 The antenna coil is configured to be larger in the width direction than the magnetic sheet, or the magnetic sheet is configured to be smaller in the width direction than the antenna coil, so that the end of the magnetic sheet is placed on the other side of the antenna coil. The antenna device according to claim 1, wherein the antenna device is shifted from the end toward the opening.
  3. 　前記磁性シートの前記端部を前記アンテナコイルの前記他方側部の前記端部よりも該他方側部の幅方向の大きさの半分の距離だけ前記開口部側にずらす請求項２に記載のアンテナ装置。 The antenna according to claim 2, wherein the end portion of the magnetic sheet is shifted to the opening side by a distance that is half the size of the other side portion in the width direction from the end portion of the other side portion of the antenna coil. apparatus.
  4. 　前記アンテナコイルは、前記一方側部に周回する前記導線のピッチが前記他方側部に周回する前記導線のピッチと異なる大きさとなっている請求項１乃至３の何れか１項に記載のアンテナ装置。 The antenna device according to any one of claims 1 to 3, wherein the antenna coil has a size in which a pitch of the conducting wire that circulates to the one side portion is different from a pitch of the conducting wire that circulates to the other side portion. .
  5. 　前記アンテナコイルは、前記導線を略短冊形状に巻回して設けられる構成となっている請求項１乃至３の何れか１項に記載のアンテナ装置。 The antenna device according to any one of claims 1 to 3, wherein the antenna coil is configured by winding the conducting wire in a substantially strip shape.
  6. 　前記アンテナコイルは、前記導線を略短冊形状に巻回して設けられる構成となっている請求項４に記載のアンテナ装置。 The antenna device according to claim 4, wherein the antenna coil is configured by winding the conducting wire in a substantially strip shape.
  7. 　請求項１乃至６の何れか１項に記載のアンテナ装置が組み込まれ、外部機器と電磁界信号を介して通信可能な電子機器。 An electronic device in which the antenna device according to any one of claims 1 to 6 is incorporated and can communicate with an external device via an electromagnetic field signal.
PCT/JP2016/054874 2015-02-26 2016-02-19 Antenna apparatus and electronic device WO2016136622A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004164547A (en) * 2002-09-27 2004-06-10 Sony Corp Electronic equipment with communication function
JP2012060626A (en) * 2010-08-12 2012-03-22 Murata Mfg Co Ltd Communication terminal apparatus
JP2013115648A (en) * 2011-11-29 2013-06-10 Dexerials Corp Antenna device and communication device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004164547A (en) * 2002-09-27 2004-06-10 Sony Corp Electronic equipment with communication function
JP2012060626A (en) * 2010-08-12 2012-03-22 Murata Mfg Co Ltd Communication terminal apparatus
JP2013115648A (en) * 2011-11-29 2013-06-10 Dexerials Corp Antenna device and communication device

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