WO2021070474A1 - Contactless power feeding antenna coil - Google Patents

Contactless power feeding antenna coil Download PDF

Info

Publication number
WO2021070474A1
WO2021070474A1 PCT/JP2020/030881 JP2020030881W WO2021070474A1 WO 2021070474 A1 WO2021070474 A1 WO 2021070474A1 JP 2020030881 W JP2020030881 W JP 2020030881W WO 2021070474 A1 WO2021070474 A1 WO 2021070474A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
winding
power
power transmission
length dimension
Prior art date
Application number
PCT/JP2020/030881
Other languages
French (fr)
Japanese (ja)
Inventor
高嶋　政秀
昌史 宮本
Original Assignee
株式会社村田製作所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社村田製作所 filed Critical 株式会社村田製作所
Publication of WO2021070474A1 publication Critical patent/WO2021070474A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/14—Inductive couplings
    • 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
    • H01Q7/08—Ferrite rod or like elongated core
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Definitions

  • the present disclosure relates to a non-contact power feeding antenna coil that supplies power in a non-contact manner between a power transmitting side and a power receiving side.
  • a non-contact type feeding antenna coil having a power transmitting coil and a power receiving coil, in which the power transmitting coil and the power receiving coil are wound around a magnetic core is known.
  • a winding is tightly wound in a concave portion of a U-shaped magnetic core, and a connecting surface is a U-shaped bottom surface.
  • Patent Document 2 utilizes magnetic coupling at the end of a solenoid coil wound around a flat or columnar magnetic core.
  • the winding is tightly wound in the recess of the magnetic core. Therefore, the generated magnetic flux tends to concentrate on the power transmission coil side around the winding.
  • protrusions convex portions protruding in one direction are provided at both ends of the magnetic core.
  • a gap space is formed between the protrusion on the power transmission coil side and the protrusion on the power reception coil side.
  • the proportion of magnetic flux (magnetic flux loop) generated between these protrusions may increase depending on the shape and dimensions of the protrusions of each coil. Therefore, the ratio of the magnetic flux supplied (toward) to the power receiving coil is reduced, and there is a possibility that sufficient power transmission and reception cannot be performed.
  • FIG. 4 of Patent Document 2 discloses a solenoid coil type non-contact power feeding device as a conventional technique.
  • this non-contact power feeding device both the power transmitting coil and the power receiving coil are wound around a flat plate or columnar ferrite core. At this time, the end portion of the winding is led out to the outside, and the power transmission coil and the power reception coil disclosed in Patent Document 2 are not assumed to be surface-mounted. This point is the same for the power transmission coil and the power reception coil disclosed in Patent Document 1.
  • An object of an embodiment of the present invention is to provide a non-contact power feeding antenna coil that can be surface-mounted, has an improved degree of coupling between a power transmitting coil and a power receiving coil, and can improve power transmission efficiency. ..
  • a non-contact power feeding antenna coil comprising a power transmitting coil and a power receiving coil and supplying power between the power transmitting coil and the power receiving coil in a non-contact manner, wherein the power transmitting coil has a columnar shape.
  • a magnetic core having a winding core and a pair of flanges arranged at both ends of the winding core, a pair of terminal electrodes arranged on the mounting surface side of the pair of collars, and winding around the winding core.
  • the power receiving coil has a columnar winding core and a pair of collars arranged at both ends of the winding core, which are rotated and have windings whose both ends are connected to the pair of terminal electrodes, respectively.
  • the transmission coil has the above, assuming that the distance between the windings in the winding axis direction is longer than the diameter of the windings and the length of the flange in the winding axis direction is the width dimension.
  • the width dimension of each of the pair of collars is 1/4 or less of the length dimension of the winding core in the winding axis direction, and the collar portion protrudes from the winding core toward the terminal electrode side of the winding core portion.
  • the protruding dimension is longer than the diameter of the winding and shorter than 5 times the diameter of the winding, and the transmitting coil and the power receiving coil are in the depth direction and the height direction orthogonal to the winding axis direction. It has a length dimension, and the distance between the power transmission coil and the power receiving coil is the length dimension in the depth direction and the length dimension in the height direction of the power transmission coil, and the length dimension in the depth direction of the power receiving coil. It is arranged so as to be shorter than the longest length dimension of the length dimensions in the height direction.
  • FIG. 5 is a characteristic diagram showing the relationship between the distance between the power transmission coil and the power reception coil and the degree of coupling obtained based on actual measurement data for the first embodiment and the comparative example. It is sectional drawing which shows the non-contact type feeding antenna coil by the 2nd Embodiment of this invention.
  • FIG. 5 is a characteristic diagram showing the relationship between the distance between the power transmission coil and the power reception coil and the degree of coupling obtained based on actual measurement data for the first and second embodiments and comparative examples. It is a perspective view which shows the non-contact type feeding antenna coil by the 3rd Embodiment of this invention.
  • FIG. 1 shows a small terminal 1 and a touch pen 2 to which the non-contact feeding antenna coil 4 according to the first embodiment of the present invention is applied.
  • the small terminal 1 (hereinafter referred to as a terminal 1) is composed of a tablet terminal or the like capable of operating the screen with the touch pen 2.
  • a holder 3 for charging (supporting) the touch pen 2 is provided on the side surface of the terminal 1. Specifically, when the touch pen 2 on the power receiving side is supported by the holder 3 with the tip 2A of the touch pen 2 facing one end side (lower side in FIG. 1), power is transmitted to the power transmitting side. It is supplied from the terminal 1 of.
  • the non-contact type feeding antenna coil 4 (hereinafter referred to as an antenna coil 4) includes a power transmitting coil 5 provided in the terminal 1 on the power transmitting side and a power receiving coil 11 provided in the touch pen 2 on the power receiving side.
  • the antenna coil 4 supplies (transmits) electric power between the power transmitting coil 5 and the power receiving coil 11 in a non-contact manner.
  • the power transmission coil 5 is located near the side surface of the terminal 1 and is arranged on the side where the holder 3 is provided. That is, the power transmission coil 5 of the terminal 1 is in a state of facing the power receiving coil 11 of the touch pen 2 when the touch pen 2 is supported by the holder 3. In this case, the magnetic flux generated when the current is supplied to the power transmission coil 5 jumps over the gap between the power transmission coil 5 and the power reception coil 11, so that the magnetic flux is also generated on the power reception coil 11 side. At this time, an induced current flows through the power receiving coil 11. As a result, the antenna coil 4 supplies electric power between the power transmitting coil 5 and the power receiving coil 11. Therefore, the touch pen 2 can be charged via the antenna coil 4. More specifically, as shown in FIGS. 2 to 4, the power transmission coil 5 has a magnetic core 6, a pair of terminal electrodes 9, 9 and a winding 10.
  • the magnetic core 6 of the power transmission coil 5 is formed of a magnetic material having a high magnetic permeability such as a silicon steel plate, permalloy, or ferrite.
  • the magnetic core 6 has a winding core 7 and a pair of collar portions 8 and 8.
  • the power transmission coil 5 has a length dimension W in the depth direction and a length dimension T in the height direction orthogonal to the winding axis direction.
  • the winding core 7 is formed in, for example, a quadrangular columnar shape.
  • the winding 10 of the power transmission coil 5 is wound around the winding core 7.
  • the winding core 7 extends in the winding axis direction of the power transmission coil 5 and has a length dimension L in the winding axis direction. This length dimension L is the same as the total length of the power transmission coil 5 (magnetic material core 6) in the winding axis direction.
  • the pair of collar portions 8 and 8 are arranged at both ends (first end and second end) of the winding core 7 in the winding axis direction.
  • the collar portion 8 is formed integrally with the winding core 7.
  • the collar portion 8 is formed in a quadrangular tubular shape.
  • the collar portion 8 is provided on the winding core 7 so as to surround the outer peripheral side of the winding core 7.
  • the flange portion 8 has four outer peripheral surfaces 8A, 8B, 8C, and 8D clockwise with respect to the winding axis direction counting from one surface (lower surface of the power transmission coil 5 in FIG. 2). That is, the flange portion 8 projects radially outward from the four outer peripheral surfaces of the winding core 7.
  • one outer peripheral surface 8A of the flange portion 8 corresponds to a mounting surface (lower surface of the power transmission coil 5 in FIG. 2) on which the terminal electrode 9 is arranged.
  • the outer peripheral surface 8C located on the opposite side of the outer peripheral surface 8A corresponds to the coupling surface facing the power receiving coil 11, that is, the feeding surface (the upper surface of the power transmission coil 5 in FIG. 2).
  • the width dimension B of the pair of collar portions 8 and 8 is the winding axis direction as shown in the equation of Equation 1. It is 1/4 or less of the length dimension L of the winding core 7 (hereinafter referred to as the first condition).
  • the width dimension B of the flange portion 8 is larger than the size at which the terminal electrode 9 can be attached to the collar portion 8.
  • the width dimension B of the flange portion 8 is larger than, for example, 1/10 of the length dimension L of the winding core 7 in the winding axis direction.
  • the size of the flange portion 8 is reduced as compared with the conventional case, and the winding shaft between the collar portion 8 on the left side (first end side) and the collar portion 8 on the right side (second end side) in FIG.
  • the directional spacing can be increased.
  • the magnetic flux generated between the left flange portion 8 and the right flange portion 8 can be suppressed.
  • the pair of terminal electrodes 9 and 9 are arranged on the outer peripheral surface 8A side (the lower surface side of the power transmission coil 5 in FIG. 2) of the pair of flange portions 8 and 8.
  • the terminal electrode 9 is located on the outer peripheral surface 8A and is formed in a thin flat plate shape, and covers the entire surface of the outer peripheral surface 8A.
  • the flange portion 8 has a protruding dimension A protruding toward the terminal electrode 9 from the winding core 7.
  • the power transmission coil 5 has a configuration assuming surface mounting (surface mounting) in which the terminal electrode 9 is attached to the electrode on the surface of the substrate.
  • the pair of terminal electrodes 9 and 9 are arranged on the mounting surface side of the pair of collar portions 8 and 8, that is, on the outer peripheral surface 8A side of the pair of collar portions 8 and 8.
  • the terminal electrode is provided on the outer peripheral surface (coupling surface) of the flange portion where the coils face each other, the magnetic flux flows out from the collar portion to the power receiving side due to the influence of the terminal electrode. It becomes difficult and the degree of coupling between the coils may decrease.
  • the terminal electrodes 9 are not provided on the outer peripheral surfaces 8B, 8C, 8D other than the mounting surface (the outer peripheral surface 8A of the flange portion 8). ..
  • the winding 10 of the power transmission coil 5 is made of a conductive metal material such as copper.
  • the winding 10 is wound around the winding core 7 a plurality of times (6 times in the drawing). Further, both ends (first end and second end) of the winding 10 are connected to a pair of terminal electrodes 9 and 9, respectively. At this time, the winding 10 is wound around the winding core 7 with a predetermined interval in the winding axis direction, that is, the interval dimension P11.
  • the number of turns of the winding 10 is not limited to the illustrated example.
  • the winding 10 has a circular cross section and has a diameter D.
  • the spacing dimension P11 of the windings 10 with respect to the winding axis direction is longer than this diameter D as shown in the equation of Equation 2 (hereinafter, referred to as the second condition).
  • the spacing dimension P11 of the winding 10 with respect to the winding axis direction can be increased as compared with the conventional coil in which the winding is wound tightly around the winding core.
  • the winding 10 is wound around the winding core 7 at intervals with respect to the winding axis direction. Therefore, the generated magnetic flux tends to diffuse from the power transmission coil 5 to the surroundings, so that the generation of the magnetic flux loop on the power transmission coil 5 side can be suppressed. As a result, the generated magnetic flux can be dispersed and the ratio of the magnetic flux supplied to the power receiving coil 11 side can be increased.
  • the windings 10 may be further spaced with respect to the winding axis direction (that is, the spacing dimension P11 may be further increased).
  • the distance dimension P11 of the winding 10 with respect to the winding axis direction is longer than, for example, 9 times the diameter D of the winding 10, and the length of the winding core 7 in the winding axis direction, as shown in the equation of Equation 3. It may be shorter than 1/2 of the dimension L (hereinafter referred to as a third condition).
  • the degree of coupling between the power transmission coil 5 and the power reception coil 11 can be improved by adjusting the spacing dimension P11 of the winding 10 with respect to the winding axis direction according to the material and size of each member.
  • the third condition (9D ⁇ P11 ⁇ L / 2) is satisfied
  • the second condition (P11> D) is automatically satisfied.
  • the protruding dimension A of the flange portion 8 is longer than the diameter D of the winding 10 and shorter than 5 times the diameter D of the winding 10 (hereinafter, the fourth). Condition).
  • the terminal electrode 9 is provided on the flange portion 8 which is a magnetic material. Therefore, by adjusting the protruding dimension A of the flange portion 8 so as to satisfy the fourth condition, the winding 10 does not interfere with the substrate, and surface mounting can be easily performed.
  • the power transmission coil 5 is compared with the conventional one.
  • the degree of coupling between the power receiving coil 11 and the power receiving coil 11 can be improved, and surface mounting can be easily performed.
  • the power receiving coil 11 is in a state of facing the power transmission coil 5 when the touch pen 2 is supported by the holder 3 of the terminal 1 on the power transmission side.
  • the power receiving coil 11 is arranged on the outer peripheral surface 8C side (upper surface side of the power transmission coil 5 in FIG. 2) of the flange portion 8 of the power transmission coil 5.
  • the power receiving coil 11 has the same configuration as the power transmission coil 5. That is, the power receiving coil 11 has a magnetic core 12, a pair of terminal electrodes 15 and 15, and a winding 16 like the power transmission coil 5.
  • the magnetic core 12 has a winding core 13 formed in a quadrangular columnar shape, and a pair of collar portions 14, 14 arranged at both ends (first end and second end) of the winding core 13. There is.
  • the winding core 13 of the power receiving coil 11 has a length dimension L in the winding axis direction.
  • the length dimension L of the winding core 13 of the power receiving coil 11 is, for example, the same value as the length dimension L of the winding core 7 of the power transmission coil 5.
  • the flange portion 14 of the power receiving coil 11 has the same width dimension B as the flange portion 8 of the power transmission coil 5. Therefore, the power receiving coil 11 satisfies the first condition (B ⁇ L / 4).
  • the collar portion 14 is formed in a quadrangular tubular shape having four outer peripheral surfaces 14A, 14B, 14C, 14D clockwise from one surface (lower surface of the power receiving coil 11 in FIG. 2) in the winding axis direction.
  • the collar portion 14 is provided on the winding core 13 so as to surround the outer peripheral side of the winding core 13.
  • one outer peripheral surface 14C of the flange portion 14 corresponds to a mounting surface on which the terminal electrode 15 is arranged (the upper surface of the power receiving coil 11 in FIG. 2).
  • the outer peripheral surface 14A located on the opposite side of the outer peripheral surface 14C corresponds to a coupling surface facing the power transmission coil 5, that is, a power feeding surface (lower surface of the power receiving coil 11 in FIG. 2). Therefore, the power receiving coil 11 is arranged in a state where the outer peripheral surface 14A of the flange portion 14 of the power receiving coil 11 faces the outer peripheral surface 8C of the flange portion 8 of the power transmission coil 5 with respect to the power transmission coil 5.
  • the power receiving coil 11 has a length dimension W in the depth direction and a length dimension T in the height direction orthogonal to the winding axis direction.
  • the length dimension W in the depth direction of the power receiving coil 11 is, for example, the same value as the length dimension W in the depth direction of the power transmission coil 5.
  • the length dimension T in the height direction of the power receiving coil 11 has the same value as, for example, the length dimension T in the height direction of the power transmission coil 5.
  • the power transmission coil 5 and the power reception coil 11 are arranged so as to face each other so as to satisfy the fifth condition. Therefore, by reducing the distance G between the power transmission coil 5 and the power reception coil 11, the gap that the generated magnetic flux should jump over can be reduced. Therefore, by adjusting the distance G between the power transmission coil 5 and the power reception coil 11, the degree of coupling between the power transmission coil 5 and the power reception coil 11 can be improved.
  • the pair of terminal electrodes 15 and 15 are arranged on the mounting surface side of the pair of collar portions 14 and 14, that is, on the outer peripheral surface 14C side of the pair of collar portions 14 and 14.
  • the flange portion 14 of the power receiving coil 11 is on the terminal electrode 15 side of the winding core 13, that is, on the outer peripheral surface 14C side of one of the flange portions 14, like the flange portion 8 of the power transmission coil 5. It has a protruding dimension A protruding from the upper surface side of the coil 11.
  • the winding 16 of the power receiving coil 11 has the same diameter D as the winding 10 of the power transmission coil 5. Therefore, the power receiving coil 11 satisfies the fourth condition (D ⁇ A ⁇ 5D).
  • the winding 16 of the power receiving coil 11 is wound around the winding core 13 a plurality of times (6 times in the drawing), and both end portions (first end portion and second end portion) are wound. ) Are connected to the pair of terminal electrodes 15 and 15, respectively.
  • the winding 16 of the power receiving coil 11 is wound tightly around the winding core 13 as compared with the winding 10 of the power transmission coil 5. That is, the spacing dimension P21 of the winding 16 of the power receiving coil 11 with respect to the winding axis direction is smaller than the spacing dimension P11 of the winding 10 of the power transmission coil 5 with respect to the winding axis direction (P21 ⁇ P11).
  • FIG. 5 shows an example of actual measurement results when the frequency band used for non-contact power feeding is 13.5 MHz (NFC standard) and the distance G is 2 mm or less.
  • the actual measurement results when the antenna coil 4 according to the first embodiment is used are shown by solid lines in FIG.
  • the actual measurement result when the antenna coil according to the comparative example is used is shown by a two-dot chain line in FIG.
  • the power transmitting coil and the power receiving coil of the antenna coil according to the comparative example have the same magnetic core as in the first embodiment, the windings are tightly wound around the core of the magnetic core.
  • the distance between the windings in the winding axis direction is the same as the diameter of the windings.
  • the degree of coupling (or coupling coefficient) has an absolute value smaller than 1.
  • the degree of coupling is 0, it means that the power transmitting coil 5 and the power receiving coil 22 are not magnetically coupled.
  • the absolute value of the degree of coupling is 1, it indicates that the power transmitting coil 5 and the power receiving coil 22 are in a completely coupled state.
  • the degree of coupling is improved in a section where the distance G between the power transmission coil 5 and the power reception coil 11 is 2 mm or less, as compared with the comparative example. .. That is, the winding 10 of the power transmission coil 5 is wound around the winding core 7 at intervals in the winding axis direction, so that the ratio of the magnetic flux supplied to the power receiving coil 11 side is increased.
  • the gap through which the magnetic flux should jump increases as the distance G increases. Therefore, the degree of coupling between the power transmission coil 5 and the power reception coil 11 decreases as the distance G increases. Therefore, in the first embodiment, in order to reduce such a gap, the power transmission coil 5 and the power reception coil 11 are adjusted to satisfy the fifth condition (G ⁇ W, T).
  • the spacing dimension P11 of the winding 10 with respect to the winding axis direction is longer than the diameter D of the winding 10 (second condition).
  • the width dimension B of the pair of collar portions 8 and 8 is 1/1 of the length dimension L of the winding core 7 in the winding axis direction, respectively. It is 4 or less (first condition).
  • the flange portion 8 projects toward the terminal electrode 9 from the winding core 7, and the protrusion dimension A of the collar portion 8 is longer than the diameter D of the winding 10 and more than 5 times the diameter D of the winding 10. Is also shorter (fourth condition).
  • the power transmitting coil 5 and the power receiving coil 11 have a length dimension W in the depth direction and a length dimension T in the height direction orthogonal to the winding axis direction.
  • the distance G between the power transmitting coil 5 and the power receiving coil 11 is the length dimension W in the depth direction and the length dimension T in the height direction of the power transmitting coil 5, and the length dimension W and the height in the depth direction of the power receiving coil 11.
  • the power transmission coil 5 satisfies the second condition (P11> D). That is, the winding 10 of the power transmission coil 5 is wound around the winding core 7 at intervals. Therefore, as compared with the conventional case, the generated magnetic flux tends to diffuse around the power transmission coil 5, and the generation of the magnetic flux loop can be suppressed.
  • the power transmission coil 5 satisfies the first condition (B ⁇ L / 4). That is, the size of the flange portion 8 of the power transmission coil 5 can be reduced and the distance between the flange portion 8 and the collar portion 8 in the winding axis direction can be increased as compared with the conventional case. As a result, the magnetic flux generated between the flange portion 8 and the flange portion 8 can be suppressed. Further, the power transmission coil 5 satisfies the fifth condition (G ⁇ W, T). That is, by reducing the distance G between the power transmission coil 5 and the power reception coil 11, the gap that the generated magnetic flux should jump over can be reduced. As described above, the ratio of the magnetic flux supplied to the power receiving coil 11 side can be increased.
  • the power transmission coil 5 satisfies the fourth condition (D ⁇ A ⁇ 5D). That is, by adjusting the protruding dimension A of the flange portion 8 so as to satisfy the fourth condition, surface mounting can be easily performed without the winding 10 interfering with the substrate.
  • the degree of coupling between the power transmission coil 5 and the power reception coil 11 is improved as compared with the conventional case, the power transmission efficiency can be improved, and surface mounting can be easily performed.
  • the distance dimension P11 of the winding 10 with respect to the winding axis direction is longer than 9 times the diameter D of the winding 10, and the length of the winding core 7 in the winding axis direction. It is shorter than 1/2 of the dimension L (third condition).
  • the power transmission coil 5 satisfies the third condition (9D ⁇ P11 ⁇ L / 2) in addition to the second condition (D ⁇ A ⁇ 5D).
  • the windings 10 may be further spaced with respect to the winding axis direction (that is, the spacing dimension P11 may be further increased).
  • FIGS. 6 and 7 show a non-contact type feeding antenna coil according to the second embodiment of the present invention.
  • the feature of the second embodiment is that not only the power transmission coil side but also the power reception coil side is configured such that the windings are wound around the winding core at intervals.
  • the same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.
  • the non-contact type feeding antenna coil 21 (hereinafter referred to as antenna coil 21) according to the second embodiment includes a power transmission coil 5 and a power receiving coil 22 arranged so as to face the power transmission coil 5. It has.
  • the winding 16 of the power receiving coil 11 of the first embodiment described above was tightly wound around the winding core 13.
  • the winding 23 of the power receiving coil 22 of the second embodiment is wound at intervals in the winding axis direction, similarly to the power transmission coil 5.
  • the winding 23 has an interval dimension P12 with respect to the winding axis direction and a diameter D same as that of the power transmission coil 5.
  • the distance dimension P12 of the winding 23 with respect to the winding axis direction is longer than the diameter D of the winding 23 (hereinafter, referred to as the second condition).
  • the spacing between the windings 23 with respect to the winding axis direction may be further increased (that is, the spacing dimension P12 may be further increased).
  • the distance dimension P12 of the winding 23 with respect to the winding axis direction is longer than 9 times the diameter D of the winding 23 as shown in the equation of Equation 7, and the length of the winding core 13 in the winding axis direction. It may be shorter than 1/2 of the dimension L (hereinafter referred to as the third'condition).
  • the power receiving coil 22 also has the first condition (B ⁇ L / 4), the fourth condition (D ⁇ A ⁇ 5D), and the fifth condition (similar to the power transmission coil 5). G ⁇ W, T) is satisfied.
  • the distance G between the power transmitting coil 5 and the power receiving coil 22 based on the measured data (in FIG. 7).
  • the relationship between the distance between the coils) and the degree of coupling was determined.
  • An example of the actual measurement result at this time is shown in FIG.
  • the conditions for acquiring the measured data are the same as in FIG. 5 (distance G is 2 mm or less, frequency range is 13.5 MHz).
  • the actual measurement result when the antenna coil 21 according to the second embodiment is used is shown by a broken line in FIG.
  • the actual measurement results when the antenna coil 4 according to the first embodiment and the antenna coil according to the comparative example are used are the same as the actual measurement results shown in FIG. 5 described above, and thus the description thereof will be omitted.
  • the antenna coil 21 according to the second embodiment when used, it is coupled in a section where the distance G between the power transmission coil 5 and the power reception coil 22 is 2 mm or less as compared with the conventional (comparative example).
  • the degree is improving. That is, the winding 10 of the power transmission coil 5 is wound around the winding core 7 at intervals in the winding axis direction, and the winding 23 of the power receiving coil 22 is wound around the winding core 13 at intervals in the winding axis direction. As a result, the proportion of magnetic flux supplied to the power receiving coil 22 side is increasing.
  • the degree of coupling is higher in a section where the distance G between the power transmitting coil 5 and the power receiving coil 22 is shorter than about 1 mm, as compared with the first embodiment. .. That is, by adjusting this distance G, the degree of coupling between the power transmission coil 5 and the power reception coil 22 can be improved.
  • the distance dimension P12 of the winding 23 with respect to the winding axis direction is longer than the diameter D of the winding 23 (second condition).
  • the width dimension B of the pair of flange portions 14 and 14 is 1/1 of the length dimension L of the winding core 13 in the winding axis direction, respectively. It is 4 or less (first condition).
  • the flange portion 14 projects toward the terminal electrode 15 from the winding core 13, and the protrusion dimension A of the collar portion 14 is longer than the diameter D of the winding 23 and more than 5 times the diameter D of the winding 23. Is also shorter (fourth condition).
  • the power transmission coil 5 and the power reception coil 22 have a length dimension W in the depth direction and a length dimension T in the height direction orthogonal to the winding axis direction.
  • the distance G between the power transmitting coil 5 and the power receiving coil 22 is the length dimension W in the depth direction and the length dimension T in the height direction of the power transmitting coil 5, and the length dimension W and the height in the depth direction of the power receiving coil 22.
  • the power receiving coil 22 satisfies the first, second', fourth, and fifth conditions as well as the power transmission coil 5. That is, not only the power transmission coil 5 but also the winding 23 of the power receiving coil 22 is wound around the winding core 13 at intervals in the winding axis direction. Therefore, the degree of coupling between the power transmission coil 5 and the power reception coil 22 can be adjusted. As a result, the degree of coupling between the power transmission coil 5 and the power reception coil 22 can be improved as compared with the conventional case.
  • the distance dimension P12 of the winding 23 with respect to the winding axis direction is longer than 9 times the diameter D of the winding 23, and the length of the winding core 13 in the winding axis direction. It is shorter than 1/2 of the dimension L (third condition).
  • the power receiving coil 22 satisfies the third condition (9D ⁇ P12 ⁇ L / 2).
  • the windings 23 may be further spaced with respect to the winding axis direction (that is, the spacing dimension P12 may be further increased).
  • the interval dimension P12 so as to satisfy the third condition (9D ⁇ P12 ⁇ L / 2), the degree of coupling between the power transmission coil 5 and the power reception coil 22 can be improved.
  • FIG. 8 shows a non-contact type feeding antenna coil according to the third embodiment of the present invention.
  • the feature of the third embodiment is that three power receiving coils are arranged around one power transmission coil.
  • the same components as those in the second embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.
  • the non-contact type feeding antenna coil 31 (hereinafter referred to as antenna coil 31) according to the third embodiment has one power transmitting coil 5 and three power receiving coils 22, 22, 22 (in FIG. 8).
  • the three power receiving coils 22, 22, 22 are provided inside the housing 32 formed in a rectangular parallelepiped shape.
  • a groove 32A for arranging the power transmission coil 5 is formed on the lower surface of the housing 32.
  • the groove portion 32A is provided so as to extend straight (in the front-rear direction in FIG. 8) near the center of the housing 32.
  • the three power receiving coils 22, 22, and 22 are attached to a single device (power receiving device) in the third embodiment, they may be attached to different devices.
  • Three power receiving coils 22, 22, 22 are arranged around the power transmission coil 5. At this time, these three power receiving coils 22, 22, 22 face each of the three outer peripheral surfaces 8B, 8C, 8D except for the outer peripheral surface 8A on which the terminal electrodes 9 and 9 of the power transmission coil 5 are arranged. ..
  • the power receiving coil 22 on the left side is arranged on the left side of the power transmission coil 5 with the upper and lower sides of the power receiving coil 22 inverted. That is, the power receiving coil 22 on the left side has the outer peripheral surface 14C, which is the mounting surface on which the terminal electrode 15 is arranged, facing downward.
  • the power receiving coil 22 on the left side faces the outer peripheral surface 8B (the left side surface of the power transmission coil 5 in FIG. 8) of the flange portion 8 of the power transmission coil 5.
  • the power receiving coil 22 on the left side is in a state where the outer peripheral surface 14B of the flange portion 14 of the power receiving coil 22 (the right side surface of the power receiving coil 22 on the left side in FIG. 8) and the outer peripheral surface 8B of the flange portion 8 of the power transmission coil 5 face each other. , Is located on the left side of the power transmission coil 5.
  • the power receiving coil 22 on the right side is also arranged on the right side of the power transmitting coil 5 with the upper and lower sides of the power receiving coil 22 inverted. That is, the power receiving coil 22 on the right side has the outer peripheral surface 14C, which is the mounting surface on which the terminal electrode 15 is arranged, facing downward.
  • the power receiving coil 22 on the right side faces the outer peripheral surface 8D of the flange portion 8 of the power transmission coil 5 (the right side surface of the power transmission coil 5 in FIG. 8).
  • the power receiving coil 22 on the right side is in a state where the outer peripheral surface 14D of the flange portion 14 of the power receiving coil 22 (the left side surface of the power receiving coil 22 on the right side in FIG. 8) and the outer peripheral surface 8D of the flange portion 8 of the power transmission coil 5 face each other. , Is located on the right side of the power transmission coil 5.
  • the power transmission coil 5 is in a state of facing three outer peripheral surfaces 8B, 8C, 8D except for the outer peripheral surface 8A of the collar portion 8 on which the terminal electrode 9 is arranged. Then, three power receiving coils 22, 22, 22 are arranged.
  • the antenna coil 31 can supply electric power between the power transmission coil 5 and the three power receiving coils 22, 22, 22 in a non-contact manner.
  • the degree of coupling between the power transmission coil 5 and the upper power receiving coil 22, the degree of coupling between the power transmission coil 5 and the left power receiving coil 22, and the degree of coupling between the power transmission coil 5 and the right power receiving coil 22 are extremely high. Can be prevented from being different. That is, non-contact power supply is supplied between the power transmission coil 5 and the three power receiving coils 22, 22, 22 while minimizing the deviation of the degree of coupling with respect to the three power receiving coils 22, 22, 22. It can be carried out.
  • the winding core 7 of the power transmission coil 5 and the winding core 13 of the power receiving coil 11 are formed in a quadrangular columnar shape.
  • the present invention is not limited to this, and for example, the winding core may be formed in a columnar shape such as a circular shape or an elliptical shape. This also applies to the second and third embodiments.
  • the flange portion 8 of the power transmission coil 5 is formed in a quadrangular tubular shape having four outer peripheral surfaces 8A, 8B, 8C, 8D, and the flange portion 14 of the power receiving coil 11 has four outer peripheral surfaces 14A. , 14B, 14C, 14D, and the case of being formed in a quadrangular tubular shape have been described as an example.
  • the present invention is not limited to this, and for example, the flange portion of the power transmission coil and the flange portion of the power receiving coil may be configured to project toward the mounting surface side and the coupling surface side, respectively, and do not project in other directions. This also applies to the second and third embodiments.
  • the length dimension W in the depth direction of the power transmission coil 5 and the power receiving coil 11 is the same as the length dimension T in the height direction of the power transmission coil 5 and the power receiving coil 11. Further, in the first embodiment, the length dimension W in the depth direction of the power receiving coil 11 is set to the same value as the length dimension W in the depth direction of the power transmitting coil 5, and the length dimension T in the height direction of the power receiving coil 11 is set. Was set to the same value as the length dimension T in the height direction of the power transmission coil 5.
  • the present invention is not limited to this, and for example, the length dimension in the depth direction and the length dimension in the height direction may be different.
  • the length dimension in the depth direction of the power receiving coil is set to a value different from the length dimension in the depth direction of the power transmitting coil
  • the length dimension in the height direction of the power receiving coil is a value different from the length dimension in the height direction of the power transmitting coil. It may be configured as. This also applies to the second and third embodiments.
  • the present invention is not limited to this, and may be applied to, for example, non-contact power supply for small and power-saving devices such as wireless earphones and wireless headphones. This also applies to the second and third embodiments.
  • the non-contact type feeding antenna coil included in the above embodiment for example, the one described below can be considered.
  • the power transmitting coil is wound in a columnar shape.
  • a magnetic core having a core and a pair of flanges arranged at both ends of the winding core, a pair of terminal electrodes arranged on the mounting surface side of the pair of collars, and winding around the winding core.
  • the power receiving coil has a columnar winding core and a pair of collar portions arranged at both ends of the winding core.
  • the transmission coil has the winding spacing dimension longer than the winding diameter in the winding axis direction, and the length of the flange portion in the winding axis direction is the width dimension.
  • the width dimension of the flange portion of the coil portion is 1/4 or less of the length dimension of the winding core in the winding axis direction, the collar portion projects from the winding core toward the terminal electrode side, and the flange portion protrudes.
  • the dimensions are longer than the diameter of the winding and shorter than 5 times the diameter of the winding, and the transmission coil and the power receiving coil are lengths in the depth direction and the height direction orthogonal to the winding axis direction.
  • the distance between the power transmitting coil and the power receiving coil is the length dimension in the depth direction and the length dimension in the height direction of the power transmitting coil, and the length dimension in the depth direction of the power receiving coil. It is characterized in that it is arranged so as to be shorter than the longest length dimension of the length dimensions in the height direction.
  • the windings of the power transmission coil are wound around the winding core at intervals. Therefore, as compared with the conventional case, the generated magnetic flux tends to diffuse around the power transmission coil, and the generation of the magnetic flux loop can be suppressed.
  • the size of the flange portion of the power transmission coil can be reduced and the distance between the pair of flange portions in the winding axis direction can be increased as compared with the conventional case.
  • the magnetic flux generated between the pair of flanges can be suppressed.
  • the gap that the generated magnetic flux should jump over can be reduced.
  • the ratio of the magnetic flux supplied to the power receiving coil side can be increased.
  • the degree of coupling between the power transmission coil and the power reception coil is improved as compared with the conventional case, the power transmission efficiency can be improved, and surface mounting can be easily performed.
  • the distance between the windings in the winding axis direction is longer than the diameter of the windings, and the length of the collar portion in the winding axis direction.
  • the width dimension is defined as the width dimension
  • the width dimension of the pair of collar portions is 1/4 or less of the length dimension of the winding core in the winding axis direction
  • the collar portion is more than the winding core and the terminal electrode. Protruding to the side, the protruding dimension of the flange portion is longer than the diameter of the winding and shorter than 5 times the diameter of the winding, and the transmitting coil and the power receiving coil are orthogonal to the winding axis direction.
  • the distance between the power transmission coil and the power receiving coil is the length dimension in the depth direction and the length direction in the height direction of the power transmission coil, and the power reception. It is characterized in that the coil is arranged so as to be shorter than the longest of the length dimension in the depth direction and the length dimension in the height direction.
  • the degree of coupling between the power transmission coil and the power reception coil can be adjusted.
  • the degree of coupling between the power transmission coil and the power reception coil can be improved as compared with the conventional case.
  • the power transmission coil and the magnetic core of the power receiving coil have the flange portion formed in a quadrangular tubular shape having four outer peripheral surfaces.
  • the terminal electrodes are arranged on one outer peripheral surface of the flange portion, and three outer peripheral surfaces other than the outer peripheral surface on which the terminal electrodes are arranged are arranged around the power transmission coil. It is characterized in that the three power receiving coils are arranged in a facing state.
  • three power receiving coils can be arranged around one power transmitting coil.
  • the non-contact type feeding antenna coil can supply electric power between the transmitting coil and the three power receiving coils in a non-contact manner.
  • the length dimension in the depth direction and the length dimension in the height direction of the power transmission coil, and the length dimension and the length in the height direction of the power receiving coil in the depth direction is characterized by having the same dimensions.
  • the magnitude of the magnetic flux toward the third (for example, the right side) power receiving coil are almost equal.
  • the degree of coupling between the power transmission coil and the first power receiving coil, the degree of coupling between the power transmission coil and the second power receiving coil, and the degree of coupling between the power transmission coil and the third power receiving coil are extremely high. Can be prevented from being different. That is, non-contact power supply can be performed between the power transmission coil and the three power receiving coils in a state where the bias of the degree of coupling with respect to the three power receiving coils is minimized.
  • the power transmission coil has a winding distance dimension longer than 9 times the diameter of the winding in the winding axis direction. It is characterized in that it is shorter than 1/2 of the length dimension of the winding core.
  • the power transmission coil may further spacing the windings in the winding axis direction (ie, further increasing the spacing dimension). By adjusting this interval dimension, the degree of coupling between the power transmission coil and the power reception coil can be improved.
  • the distance between the windings with respect to the winding axis direction is longer than 9 times the diameter of the windings, and the length of the winding core in the winding axis direction. It is characterized by being shorter than 1/2 of the dimension.
  • the power receiving coil may be further spaced in the winding axis direction (that is, the spacing dimension may be further increased), similarly to the power transmission coil.
  • the spacing dimension may be further increased, similarly to the power transmission coil.
  • Antenna coil (non-contact type feeding antenna coil) 5 Transmission coil 6,12 Magnetic core 7,13 Winding core 8,14 Collar 8A, 8B, 8C, 8D, 14A, 14B, 14C, 14D Outer peripheral surface 9,15 Terminal electrode 10, 16, 23 Winding 11, 22 Power receiving coil A Protruding dimension B Width dimension D Diameter G Distance L Winding core length dimension P11, P12, P21 Spacing dimension T Height direction length dimension W Depth direction length dimension

Abstract

A power transmission coil (5) comprises a magnetic core (6), a pair of terminal electrodes (9), (9), and a winding (10). The magnetic core (6) includes a winding core (7) and a pair of flanges (8), (8). The winding (10) has a gap dimension (P11) greater than the diameter (D) of the winding (10). The flanges (8) have a width dimension (B) less than or equal to one fourth a length dimension (L) of the winding core (7) in a winding axis direction. The flanges (8) have a protrusion dimension (A) greater than the diameter (D) of the winding (10) and less than five times the diameter (D) of the winding (10). The distance (G) between the power transmission coil (5) and a power reception coil (11) is less than the longest of a depth-direction length dimension (W) and a height-direction length dimension (T) of the power transmission coil (5), and a depth-direction length dimension (W) and a height-direction length dimension (T) of the power reception coil (11).

Description

非接触型給電アンテナコイルNon-contact feeding antenna coil
　本開示は、送電側と受電側との間で非接触で電力を供給する非接触型給電アンテナコイルに関する。 The present disclosure relates to a non-contact power feeding antenna coil that supplies power in a non-contact manner between a power transmitting side and a power receiving side.
　送電コイルと受電コイルとを備え、送電コイルおよび受電コイルが磁性体コアに巻線が巻回されて構成された非接触型給電アンテナコイルが知られている。例えば、特許文献１では、コの字型の磁性体コアの凹部に巻線が密に巻回されており、結合面がコの字の底面になっている。また、例えば、特許文献２では、平板状または柱状の磁性体コアに巻回されたソレノイドコイルの端部での磁気結合を利用している。 A non-contact type feeding antenna coil having a power transmitting coil and a power receiving coil, in which the power transmitting coil and the power receiving coil are wound around a magnetic core, is known. For example, in Patent Document 1, a winding is tightly wound in a concave portion of a U-shaped magnetic core, and a connecting surface is a U-shaped bottom surface. Further, for example, Patent Document 2 utilizes magnetic coupling at the end of a solenoid coil wound around a flat or columnar magnetic core.
特開平８－２４１３８４号公報Japanese Unexamined Patent Publication No. 8-241384 特開２０１５－１３０７３４号公報JP-A-2015-130734
　ところで、特許文献１に記載されたアンテナコイルでは、磁性体コアの凹部に巻線を密に巻回している。このため、発生した磁束は、巻線の周囲で送電コイル側に集中する傾向がある。これに加えて、磁性体コアの両端には、一方向に突出した突起（凸部）が設けられている。送電コイル側の突起と受電コイル側の突起との間にギャップ（空間）が形成されている。この場合、各コイルの突起の形状や寸法によっては、これらの突起間で発生する磁束（磁束ループ）の割合が増える可能性がある。従って、受電コイルに供給される（向かう）磁束の割合が減り、十分な送電、受電ができない可能性がある。 By the way, in the antenna coil described in Patent Document 1, the winding is tightly wound in the recess of the magnetic core. Therefore, the generated magnetic flux tends to concentrate on the power transmission coil side around the winding. In addition to this, protrusions (convex portions) protruding in one direction are provided at both ends of the magnetic core. A gap (space) is formed between the protrusion on the power transmission coil side and the protrusion on the power reception coil side. In this case, the proportion of magnetic flux (magnetic flux loop) generated between these protrusions may increase depending on the shape and dimensions of the protrusions of each coil. Therefore, the ratio of the magnetic flux supplied (toward) to the power receiving coil is reduced, and there is a possibility that sufficient power transmission and reception cannot be performed.
　一方、特許文献２の図４には、従来技術としてソレノイドコイル方式の非接触給電装置が開示されている。この非接触給電装置では、送電コイルと受電コイルのいずれも、平板状または柱状のフェライトコアに巻線が巻回されている。このとき、巻線の端部は外部に導出されており、特許文献２に開示された送電コイルと受電コイルは、面実装を想定していない。この点は、特許文献１に開示された送電コイルと受電コイルも同様である。 On the other hand, FIG. 4 of Patent Document 2 discloses a solenoid coil type non-contact power feeding device as a conventional technique. In this non-contact power feeding device, both the power transmitting coil and the power receiving coil are wound around a flat plate or columnar ferrite core. At this time, the end portion of the winding is led out to the outside, and the power transmission coil and the power reception coil disclosed in Patent Document 2 are not assumed to be surface-mounted. This point is the same for the power transmission coil and the power reception coil disclosed in Patent Document 1.
　本発明の一実施形態の目的は、面実装が可能で、送電コイルと受電コイルとの結合度が向上し、電力伝送効率を向上することができる非接触型給電アンテナコイルを提供することにある。 An object of an embodiment of the present invention is to provide a non-contact power feeding antenna coil that can be surface-mounted, has an improved degree of coupling between a power transmitting coil and a power receiving coil, and can improve power transmission efficiency. ..
　本発明の一実施形態は、送電コイルと受電コイルとを備え、前記送電コイルと前記受電コイルとの間で非接触で電力を供給する非接触型給電アンテナコイルにおいて、前記送電コイルは、柱状の巻芯と前記巻芯の両端に配設された一対の鍔部とを有する磁性体コアと、前記一対の鍔部の実装面側に配設された一対の端子電極と、前記巻芯に巻回され、両端部が前記一対の端子電極にそれぞれ接続される巻線と、を有し、前記受電コイルは、柱状の巻芯と前記巻芯の両端に配設された一対の鍔部とを有する磁性体コアと、前記一対の鍔部の実装面側に配設された一対の端子電極と、前記巻芯に巻回され、両端部が前記一対の端子電極にそれぞれ接続される巻線と、を有し、前記送電コイルは、巻き軸方向に対する前記巻線の間隔寸法が前記巻線の直径よりも長くなっており、巻き軸方向に対する前記鍔部の長さを幅寸法とすると、前記一対の鍔部の幅寸法がそれぞれ巻き軸方向の前記巻芯の長さ寸法の１／４以下となっており、前記鍔部が前記巻芯よりも前記端子電極側に突出し、前記鍔部の突出寸法は、前記巻線の直径よりも長く、前記巻線の直径の５倍よりも短くなっており、前記送電コイルおよび前記受電コイルは、巻き軸方向と直交する奥行方向および高さ方向の長さ寸法を有し、前記送電コイルと前記受電コイルとの距離が、前記送電コイルの奥行方向の長さ寸法と高さ方向の長さ寸法、および、前記受電コイルの奥行方向の長さ寸法と高さ方向の長さ寸法のうち最長となる長さ寸法よりも短くなるように、配置される。 In one embodiment of the present invention, a non-contact power feeding antenna coil comprising a power transmitting coil and a power receiving coil and supplying power between the power transmitting coil and the power receiving coil in a non-contact manner, wherein the power transmitting coil has a columnar shape. A magnetic core having a winding core and a pair of flanges arranged at both ends of the winding core, a pair of terminal electrodes arranged on the mounting surface side of the pair of collars, and winding around the winding core. The power receiving coil has a columnar winding core and a pair of collars arranged at both ends of the winding core, which are rotated and have windings whose both ends are connected to the pair of terminal electrodes, respectively. A magnetic core, a pair of terminal electrodes arranged on the mounting surface side of the pair of collars, and a winding wound around the core and both ends connected to the pair of terminal electrodes. The transmission coil has the above, assuming that the distance between the windings in the winding axis direction is longer than the diameter of the windings and the length of the flange in the winding axis direction is the width dimension. The width dimension of each of the pair of collars is 1/4 or less of the length dimension of the winding core in the winding axis direction, and the collar portion protrudes from the winding core toward the terminal electrode side of the winding core portion. The protruding dimension is longer than the diameter of the winding and shorter than 5 times the diameter of the winding, and the transmitting coil and the power receiving coil are in the depth direction and the height direction orthogonal to the winding axis direction. It has a length dimension, and the distance between the power transmission coil and the power receiving coil is the length dimension in the depth direction and the length dimension in the height direction of the power transmission coil, and the length dimension in the depth direction of the power receiving coil. It is arranged so as to be shorter than the longest length dimension of the length dimensions in the height direction.
　本発明の一実施形態によれば、面実装が可能で、送電コイルと受電コイルとの結合度が向上し、電力伝送効率を向上することができる。 According to one embodiment of the present invention, surface mounting is possible, the degree of coupling between the power transmission coil and the power reception coil is improved, and the power transmission efficiency can be improved.
本発明の第１の実施形態による非接触型給電アンテナコイルの送電側となる小型端末と受電側となるタッチペンとを示す正面図である。It is a front view which shows the small terminal which becomes the power transmission side and the touch pen which becomes the power reception side of the non-contact type feeding antenna coil according to the 1st Embodiment of this invention. 図１中の非接触型給電アンテナコイルを示す断面図である。It is sectional drawing which shows the non-contact type feeding antenna coil in FIG. 図２中の送電コイルを示す断面図である。It is sectional drawing which shows the power transmission coil in FIG. 図３の送電コイルを示す斜視図である。It is a perspective view which shows the power transmission coil of FIG. 第１の実施形態および比較例について、実測データに基づいて求められた、送電コイルと受電コイルとの距離および結合度の関係を示す特性線図である。FIG. 5 is a characteristic diagram showing the relationship between the distance between the power transmission coil and the power reception coil and the degree of coupling obtained based on actual measurement data for the first embodiment and the comparative example. 本発明の第２の実施形態による非接触型給電アンテナコイルを示す断面図である。It is sectional drawing which shows the non-contact type feeding antenna coil by the 2nd Embodiment of this invention. 第１，第２の実施形態および比較例について、実測データに基づいて求められた、送電コイルと受電コイルとの距離および結合度の関係を示す特性線図である。FIG. 5 is a characteristic diagram showing the relationship between the distance between the power transmission coil and the power reception coil and the degree of coupling obtained based on actual measurement data for the first and second embodiments and comparative examples. 本発明の第３の実施形態による非接触型給電アンテナコイルを示す斜視図である。It is a perspective view which shows the non-contact type feeding antenna coil by the 3rd Embodiment of this invention.
　以下、本発明の実施形態による非接触型給電アンテナコイルを、添付図面を参照しつつ詳細に説明する。 Hereinafter, the non-contact type feeding antenna coil according to the embodiment of the present invention will be described in detail with reference to the attached drawings.
　図１は、本発明の第１の実施形態による非接触型給電アンテナコイル４が適用される小型端末１およびタッチペン２を示している。小型端末１（以下、端末１という）は、タッチペン２による画面操作が可能なタブレット端末等により構成されている。端末１の側面には、タッチペン２を充電（支持）するためのホルダ３が設けられている。具体的には、受電側のタッチペン２には、タッチペン２の先端部２Ａが一端側（図１の下側）に向いた状態でタッチペン２がホルダ３に支持されたときに、電力が送電側の端末１から供給される。 FIG. 1 shows a small terminal 1 and a touch pen 2 to which the non-contact feeding antenna coil 4 according to the first embodiment of the present invention is applied. The small terminal 1 (hereinafter referred to as a terminal 1) is composed of a tablet terminal or the like capable of operating the screen with the touch pen 2. A holder 3 for charging (supporting) the touch pen 2 is provided on the side surface of the terminal 1. Specifically, when the touch pen 2 on the power receiving side is supported by the holder 3 with the tip 2A of the touch pen 2 facing one end side (lower side in FIG. 1), power is transmitted to the power transmitting side. It is supplied from the terminal 1 of.
　非接触型給電アンテナコイル４（以下、アンテナコイル４という）は、送電側の端末１に設けられた送電コイル５と、受電側のタッチペン２に設けられた受電コイル１１とを備えている。アンテナコイル４は、送電コイル５と受電コイル１１との間で非接触で電力を供給（伝送）している。 The non-contact type feeding antenna coil 4 (hereinafter referred to as an antenna coil 4) includes a power transmitting coil 5 provided in the terminal 1 on the power transmitting side and a power receiving coil 11 provided in the touch pen 2 on the power receiving side. The antenna coil 4 supplies (transmits) electric power between the power transmitting coil 5 and the power receiving coil 11 in a non-contact manner.
　送電コイル５は、端末１の側面の近傍に位置してホルダ３が設けられている側に配置されている。即ち、端末１の送電コイル５は、タッチペン２がホルダ３に支持されることで、タッチペン２の受電コイル１１と対面した状態になる。この場合、送電コイル５に対して電流を供給したときに発生した磁束が送電コイル５と受電コイル１１との間のギャップを飛び越えることで、受電コイル１１側にも磁束が発生する。このとき、誘導電流が受電コイル１１に流れる。これにより、アンテナコイル４は、送電コイル５と受電コイル１１との間で電力を供給する。従って、アンテナコイル４を介してタッチペン２を充電することができる。より具体的には、図２ないし図４に示すように、送電コイル５は、磁性体コア６と一対の端子電極９，９と巻線１０とを有している。 The power transmission coil 5 is located near the side surface of the terminal 1 and is arranged on the side where the holder 3 is provided. That is, the power transmission coil 5 of the terminal 1 is in a state of facing the power receiving coil 11 of the touch pen 2 when the touch pen 2 is supported by the holder 3. In this case, the magnetic flux generated when the current is supplied to the power transmission coil 5 jumps over the gap between the power transmission coil 5 and the power reception coil 11, so that the magnetic flux is also generated on the power reception coil 11 side. At this time, an induced current flows through the power receiving coil 11. As a result, the antenna coil 4 supplies electric power between the power transmitting coil 5 and the power receiving coil 11. Therefore, the touch pen 2 can be charged via the antenna coil 4. More specifically, as shown in FIGS. 2 to 4, the power transmission coil 5 has a magnetic core 6, a pair of terminal electrodes 9, 9 and a winding 10.
　送電コイル５の磁性体コア６は、例えばケイ素鋼板、パーマロイ、フェライト等の高透磁率を有する磁性材料によって形成されている。磁性体コア６は、巻芯７と一対の鍔部８，８とを有している。送電コイル５は、巻き軸方向と直交する奥行方向の長さ寸法Ｗおよび高さ方向の長さ寸法Ｔを有している。 The magnetic core 6 of the power transmission coil 5 is formed of a magnetic material having a high magnetic permeability such as a silicon steel plate, permalloy, or ferrite. The magnetic core 6 has a winding core 7 and a pair of collar portions 8 and 8. The power transmission coil 5 has a length dimension W in the depth direction and a length dimension T in the height direction orthogonal to the winding axis direction.
　巻芯７は、例えば四角形の柱状に形成されている。巻芯７には、送電コイル５の巻線１０が巻回されている。巻芯７は、送電コイル５の巻き軸方向に延びており、巻き軸方向の長さ寸法Ｌを有している。この長さ寸法Ｌは、送電コイル５（磁性体コア６）の巻き軸方向の全長と同一である。 The winding core 7 is formed in, for example, a quadrangular columnar shape. The winding 10 of the power transmission coil 5 is wound around the winding core 7. The winding core 7 extends in the winding axis direction of the power transmission coil 5 and has a length dimension L in the winding axis direction. This length dimension L is the same as the total length of the power transmission coil 5 (magnetic material core 6) in the winding axis direction.
　一対の鍔部８，８は、巻芯７の巻き軸方向の両端（第１端と第２端）に配設されている。鍔部８は、巻芯７と一体化して形成されている。鍔部８は、四角形の筒状に形成されている。鍔部８は、巻芯７の外周側を取り囲む状態で、巻芯７に設けられている。このとき、鍔部８は、一面（図２では送電コイル５の下面）から数えて巻き軸方向に対して時計回りに４つの外周面８Ａ，８Ｂ，８Ｃ，８Ｄを有している。即ち、鍔部８は、巻芯７の４つの外周面よりも径方向外側にそれぞれ突出している。ここで、鍔部８の１つの外周面８Ａは、端子電極９が配設される実装面（図２では送電コイル５の下面）に相当する。外周面８Ａと反対側に位置する外周面８Ｃは、受電コイル１１と対面する結合面、即ち、給電面（図２では送電コイル５の上面）に相当する。 The pair of collar portions 8 and 8 are arranged at both ends (first end and second end) of the winding core 7 in the winding axis direction. The collar portion 8 is formed integrally with the winding core 7. The collar portion 8 is formed in a quadrangular tubular shape. The collar portion 8 is provided on the winding core 7 so as to surround the outer peripheral side of the winding core 7. At this time, the flange portion 8 has four outer peripheral surfaces 8A, 8B, 8C, and 8D clockwise with respect to the winding axis direction counting from one surface (lower surface of the power transmission coil 5 in FIG. 2). That is, the flange portion 8 projects radially outward from the four outer peripheral surfaces of the winding core 7. Here, one outer peripheral surface 8A of the flange portion 8 corresponds to a mounting surface (lower surface of the power transmission coil 5 in FIG. 2) on which the terminal electrode 9 is arranged. The outer peripheral surface 8C located on the opposite side of the outer peripheral surface 8A corresponds to the coupling surface facing the power receiving coil 11, that is, the feeding surface (the upper surface of the power transmission coil 5 in FIG. 2).
　また、巻き軸方向に対する鍔部８の長さを幅寸法Ｂ（図３参照）とすると、一対の鍔部８，８の幅寸法Ｂは、数１の式に示すように、それぞれ巻き軸方向の巻芯７の長さ寸法Ｌの１／４以下となっている（以下、第１の条件という）。但し、鍔部８の幅寸法Ｂは、端子電極９が鍔部８に取り付け可能となる大きさよりも大きい。具体的には、鍔部８の幅寸法Ｂは、例えば巻き軸方向の巻芯７の長さ寸法Ｌの１／１０よりも大きくなっている。 Further, assuming that the length of the flange portion 8 with respect to the winding axis direction is the width dimension B (see FIG. 3), the width dimension B of the pair of collar portions 8 and 8 is the winding axis direction as shown in the equation of Equation 1. It is 1/4 or less of the length dimension L of the winding core 7 (hereinafter referred to as the first condition). However, the width dimension B of the flange portion 8 is larger than the size at which the terminal electrode 9 can be attached to the collar portion 8. Specifically, the width dimension B of the flange portion 8 is larger than, for example, 1/10 of the length dimension L of the winding core 7 in the winding axis direction.
Figure JPOXMLDOC01-appb-M000001
Figure JPOXMLDOC01-appb-M000001
　従って、従来と比較して、鍔部８のサイズが低減し、図２中の左側（第１端側）の鍔部８と右側（第２端側）の鍔部８との間の巻き軸方向の間隔を増加させることができる。これにより、左側の鍔部８と右側の鍔部８との間で発生する磁束を抑制することができる。 Therefore, the size of the flange portion 8 is reduced as compared with the conventional case, and the winding shaft between the collar portion 8 on the left side (first end side) and the collar portion 8 on the right side (second end side) in FIG. The directional spacing can be increased. As a result, the magnetic flux generated between the left flange portion 8 and the right flange portion 8 can be suppressed.
　一対の端子電極９，９は、一対の鍔部８，８の外周面８Ａ側（図２では送電コイル５の下面側）に配設されている。端子電極９は、外周面８Ａ上に位置して薄い平板状に形成されており、外周面８Ａの全面を覆っている。このとき、鍔部８は、巻芯７よりも端子電極９側に突出した突出寸法Ａを有している。 The pair of terminal electrodes 9 and 9 are arranged on the outer peripheral surface 8A side (the lower surface side of the power transmission coil 5 in FIG. 2) of the pair of flange portions 8 and 8. The terminal electrode 9 is located on the outer peripheral surface 8A and is formed in a thin flat plate shape, and covers the entire surface of the outer peripheral surface 8A. At this time, the flange portion 8 has a protruding dimension A protruding toward the terminal electrode 9 from the winding core 7.
　ここで、実施形態による送電コイル５は、端子電極９を基板表面の電極に取り付ける面実装（表面実装）を想定した構成となっている。この場合、一対の端子電極９，９は、一対の鍔部８，８の実装面側、即ち、一対の鍔部８，８の外周面８Ａ側に配設されている。なお、実施形態とは異なり、例えば、コイル同士が互いに対面する鍔部の外周面（結合面）に端子電極が設けられる構成の場合、端子電極の影響で磁束が鍔部から受電側へ流出し難くなり、コイル間の結合度が低下する可能性がある。このような端子電極による影響を抑制するために、実施形態では、端子電極９は、実装面（鍔部８の外周面８Ａ）以外の外周面８Ｂ，８Ｃ，８Ｄに設けない構成となっている。 Here, the power transmission coil 5 according to the embodiment has a configuration assuming surface mounting (surface mounting) in which the terminal electrode 9 is attached to the electrode on the surface of the substrate. In this case, the pair of terminal electrodes 9 and 9 are arranged on the mounting surface side of the pair of collar portions 8 and 8, that is, on the outer peripheral surface 8A side of the pair of collar portions 8 and 8. Unlike the embodiment, for example, in the case where the terminal electrode is provided on the outer peripheral surface (coupling surface) of the flange portion where the coils face each other, the magnetic flux flows out from the collar portion to the power receiving side due to the influence of the terminal electrode. It becomes difficult and the degree of coupling between the coils may decrease. In order to suppress the influence of such terminal electrodes, in the embodiment, the terminal electrodes 9 are not provided on the outer peripheral surfaces 8B, 8C, 8D other than the mounting surface (the outer peripheral surface 8A of the flange portion 8). ..
　送電コイル５の巻線１０は、例えば銅等の導電性金属材料によって形成されている。巻線１０は、巻芯７に複数回（図面では６回）巻回されている。さらに、巻線１０の両端部（第１端部と第２端部）は、一対の端子電極９，９にそれぞれ接続されている。このとき、巻線１０は、巻き軸方向に所定の間隔、即ち、間隔寸法Ｐ１１をもって巻芯７に巻回されている。なお、巻線１０の巻き数は、図示の例に限らない。 The winding 10 of the power transmission coil 5 is made of a conductive metal material such as copper. The winding 10 is wound around the winding core 7 a plurality of times (6 times in the drawing). Further, both ends (first end and second end) of the winding 10 are connected to a pair of terminal electrodes 9 and 9, respectively. At this time, the winding 10 is wound around the winding core 7 with a predetermined interval in the winding axis direction, that is, the interval dimension P11. The number of turns of the winding 10 is not limited to the illustrated example.
　また、巻線１０は、断面が円形状に形成されており、直径Ｄを有している。送電コイル５では、巻き軸方向に対する巻線１０の間隔寸法Ｐ１１は、数２の式に示すように、この直径Ｄよりも長くなっている（以下、第２の条件という）。 Further, the winding 10 has a circular cross section and has a diameter D. In the power transmission coil 5, the spacing dimension P11 of the windings 10 with respect to the winding axis direction is longer than this diameter D as shown in the equation of Equation 2 (hereinafter, referred to as the second condition).
Figure JPOXMLDOC01-appb-M000002
Figure JPOXMLDOC01-appb-M000002
　従って、巻線を巻芯に密に巻回していた従来のコイルと比較して、巻き軸方向に対する巻線１０の間隔寸法Ｐ１１を増やすことができる。言い換えれば、巻線１０は、巻き軸方向に対して間隔をもって巻芯７に巻回されている。このため、発生した磁束は、送電コイル５から周囲に拡散する傾向になるから、送電コイル５側での磁束ループの発生を抑制することができる。これにより、発生した磁束を分散させて、受電コイル１１側に供給される磁束の割合を増やすことができる。 Therefore, the spacing dimension P11 of the winding 10 with respect to the winding axis direction can be increased as compared with the conventional coil in which the winding is wound tightly around the winding core. In other words, the winding 10 is wound around the winding core 7 at intervals with respect to the winding axis direction. Therefore, the generated magnetic flux tends to diffuse from the power transmission coil 5 to the surroundings, so that the generation of the magnetic flux loop on the power transmission coil 5 side can be suppressed. As a result, the generated magnetic flux can be dispersed and the ratio of the magnetic flux supplied to the power receiving coil 11 side can be increased.
　なお、巻き軸方向に対する巻線１０の間隔をさらにあけてもよい（即ち、間隔寸法Ｐ１１をさらに増やしてもよい）。具体的には、巻き軸方向に対する巻線１０の間隔寸法Ｐ１１は、数３の式に示すように、例えば巻線１０の直径Ｄの９倍よりも長く、巻き軸方向の巻芯７の長さ寸法Ｌの１／２よりも短くしてもよい（以下、第３の条件という）。 Note that the windings 10 may be further spaced with respect to the winding axis direction (that is, the spacing dimension P11 may be further increased). Specifically, the distance dimension P11 of the winding 10 with respect to the winding axis direction is longer than, for example, 9 times the diameter D of the winding 10, and the length of the winding core 7 in the winding axis direction, as shown in the equation of Equation 3. It may be shorter than 1/2 of the dimension L (hereinafter referred to as a third condition).
Figure JPOXMLDOC01-appb-M000003
Figure JPOXMLDOC01-appb-M000003
　従って、各部材の材料やサイズによって、巻き軸方向に対する巻線１０の間隔寸法Ｐ１１を調整することで、送電コイル５と受電コイル１１との結合度を向上させることができる。ここで、第３の条件（９Ｄ＜Ｐ１１＜Ｌ／２）が満たされるとき、第２の条件（Ｐ１１＞Ｄ）は自動的に満たされる。 Therefore, the degree of coupling between the power transmission coil 5 and the power reception coil 11 can be improved by adjusting the spacing dimension P11 of the winding 10 with respect to the winding axis direction according to the material and size of each member. Here, when the third condition (9D <P11 <L / 2) is satisfied, the second condition (P11> D) is automatically satisfied.
　さらに、鍔部８の突出寸法Ａは、数４の式に示すように、巻線１０の直径Ｄよりも長く、巻線１０の直径Ｄの５倍よりも短くなっている（以下、第４の条件という）。実施形態では、磁性体である鍔部８に端子電極９が設けられる。従って、第４の条件を満たすように鍔部８の突出寸法Ａを調整することで、巻線１０が基板に干渉することがなく、面実装が容易にできる。 Further, as shown in the equation of Equation 4, the protruding dimension A of the flange portion 8 is longer than the diameter D of the winding 10 and shorter than 5 times the diameter D of the winding 10 (hereinafter, the fourth). Condition). In the embodiment, the terminal electrode 9 is provided on the flange portion 8 which is a magnetic material. Therefore, by adjusting the protruding dimension A of the flange portion 8 so as to satisfy the fourth condition, the winding 10 does not interfere with the substrate, and surface mounting can be easily performed.
Figure JPOXMLDOC01-appb-M000004
Figure JPOXMLDOC01-appb-M000004
　特に、第１の条件（Ｂ≦Ｌ／４）、第２の条件（Ｐ１１＞Ｄ）および第４の条件（Ｄ＜Ａ＜５Ｄ）が満たされるときに、従来と比較して、送電コイル５と受電コイル１１との結合度を向上させることができ、かつ、面実装が容易にできる。 In particular, when the first condition (B ≦ L / 4), the second condition (P11> D) and the fourth condition (D <A <5D) are satisfied, the power transmission coil 5 is compared with the conventional one. The degree of coupling between the power receiving coil 11 and the power receiving coil 11 can be improved, and surface mounting can be easily performed.
　受電コイル１１は、タッチペン２が送電側の端末１のホルダ３に支持されているとき、送電コイル５と対面した状態になる。受電コイル１１は、送電コイル５の鍔部８の外周面８Ｃ側（図２では送電コイル５の上面側）に配置されている。 The power receiving coil 11 is in a state of facing the power transmission coil 5 when the touch pen 2 is supported by the holder 3 of the terminal 1 on the power transmission side. The power receiving coil 11 is arranged on the outer peripheral surface 8C side (upper surface side of the power transmission coil 5 in FIG. 2) of the flange portion 8 of the power transmission coil 5.
　また、受電コイル１１は、送電コイル５と同様の構成となっている。即ち、受電コイル１１は、送電コイル５と同様に、磁性体コア１２と、一対の端子電極１５，１５と、巻線１６とを有している。 Further, the power receiving coil 11 has the same configuration as the power transmission coil 5. That is, the power receiving coil 11 has a magnetic core 12, a pair of terminal electrodes 15 and 15, and a winding 16 like the power transmission coil 5.
　磁性体コア１２は、四角形の柱状に形成された巻芯１３と、この巻芯１３の両端（第１端と第２端）に配設された一対の鍔部１４，１４とを有している。受電コイル１１の巻芯１３は、巻き軸方向の長さ寸法Ｌを有している。受電コイル１１の巻芯１３の長さ寸法Ｌは、例えば送電コイル５の巻芯７の長さ寸法Ｌと同じ値になっている。また、受電コイル１１の鍔部１４は、送電コイル５の鍔部８と同一の幅寸法Ｂを有している。従って、受電コイル１１は、第１の条件（Ｂ≦Ｌ／４）を満たしている。 The magnetic core 12 has a winding core 13 formed in a quadrangular columnar shape, and a pair of collar portions 14, 14 arranged at both ends (first end and second end) of the winding core 13. There is. The winding core 13 of the power receiving coil 11 has a length dimension L in the winding axis direction. The length dimension L of the winding core 13 of the power receiving coil 11 is, for example, the same value as the length dimension L of the winding core 7 of the power transmission coil 5. Further, the flange portion 14 of the power receiving coil 11 has the same width dimension B as the flange portion 8 of the power transmission coil 5. Therefore, the power receiving coil 11 satisfies the first condition (B ≦ L / 4).
　鍔部１４は、一面（図２では受電コイル１１の下面）から巻き軸方向の時計回りに４つの外周面１４Ａ，１４Ｂ，１４Ｃ，１４Ｄを有する四角形の筒状に形成されている。鍔部１４は、巻芯１３の外周側を取り囲む状態で、巻芯１３に設けられている。ここで、鍔部１４の１つの外周面１４Ｃは、端子電極１５が配設される実装面（図２では受電コイル１１の上面）に相当する。この外周面１４Ｃと反対側に位置する外周面１４Ａは、送電コイル５と対面する結合面、即ち、給電面（図２では受電コイル１１の下面）に相当する。従って、受電コイル１１は、送電コイル５に対して、受電コイル１１の鍔部１４の外周面１４Ａが送電コイル５の鍔部８の外周面８Ｃと対面した状態で配置される。 The collar portion 14 is formed in a quadrangular tubular shape having four outer peripheral surfaces 14A, 14B, 14C, 14D clockwise from one surface (lower surface of the power receiving coil 11 in FIG. 2) in the winding axis direction. The collar portion 14 is provided on the winding core 13 so as to surround the outer peripheral side of the winding core 13. Here, one outer peripheral surface 14C of the flange portion 14 corresponds to a mounting surface on which the terminal electrode 15 is arranged (the upper surface of the power receiving coil 11 in FIG. 2). The outer peripheral surface 14A located on the opposite side of the outer peripheral surface 14C corresponds to a coupling surface facing the power transmission coil 5, that is, a power feeding surface (lower surface of the power receiving coil 11 in FIG. 2). Therefore, the power receiving coil 11 is arranged in a state where the outer peripheral surface 14A of the flange portion 14 of the power receiving coil 11 faces the outer peripheral surface 8C of the flange portion 8 of the power transmission coil 5 with respect to the power transmission coil 5.
　ここで、受電コイル１１は、巻き軸方向と直交する奥行方向の長さ寸法Ｗおよび高さ方向の長さ寸法Ｔを有している。受電コイル１１の奥行方向の長さ寸法Ｗは、例えば送電コイル５と奥行方向の長さ寸法Ｗと同じ値になっている。受電コイル１１の高さ方向の長さ寸法Ｔは、例えば送電コイル５と高さ方向の長さ寸法Ｔと同じ値になっている。また、送電コイル５および受電コイル１１の奥行方向の長さ寸法Ｗは、送電コイル５および受電コイル１１の高さ方向の長さ寸法Ｔと同一である（Ｗ＝Ｔ）。このとき、送電コイル５側の巻き軸方向の巻芯７の長さ寸法Ｌおよび受電コイル１１側の巻き軸方向の巻芯１３の長さ寸法Ｌは、奥行方向の長さ寸法Ｗ（＝高さ方向の長さ寸法Ｔ）よりも長くなっている（Ｌ＞Ｗ，Ｔ）。 Here, the power receiving coil 11 has a length dimension W in the depth direction and a length dimension T in the height direction orthogonal to the winding axis direction. The length dimension W in the depth direction of the power receiving coil 11 is, for example, the same value as the length dimension W in the depth direction of the power transmission coil 5. The length dimension T in the height direction of the power receiving coil 11 has the same value as, for example, the length dimension T in the height direction of the power transmission coil 5. Further, the length dimension W in the depth direction of the power transmission coil 5 and the power reception coil 11 is the same as the length dimension T in the height direction of the power transmission coil 5 and the power reception coil 11 (W = T). At this time, the length dimension L of the winding core 7 in the winding axis direction on the power transmission coil 5 side and the length dimension L of the winding core 13 in the winding axis direction on the power receiving coil 11 side are the length dimension W (= height) in the depth direction. It is longer than the vertical dimension T) (L> W, T).
　さらに、送電コイル５と受電コイル１１との間の距離Ｇ（間隔寸法）は、以下の数５の式に示すように、送電コイル５の奥行方向の長さ寸法Ｗと高さ方向の長さ寸法Ｔ、および、受電コイル１１の奥行方向の長さ寸法Ｗと高さ方向の長さ寸法Ｔのうち最長となる長さ寸法Ｗ（＝Ｔ）よりも短くなっている（以下、第５の条件という）。 Further, the distance G (interval dimension) between the power transmitting coil 5 and the power receiving coil 11 is the length dimension W in the depth direction and the length in the height direction of the power transmitting coil 5 as shown in the following equation (5). It is shorter than the longest length dimension W (= T) of the dimension T and the length dimension W in the depth direction and the length dimension T in the height direction of the power receiving coil 11 (hereinafter, the fifth). Condition).
Figure JPOXMLDOC01-appb-M000005
Figure JPOXMLDOC01-appb-M000005
　即ち、送電コイル５および受電コイル１１は、第５の条件を満たすように、互いに対面した状態で配置される。このため、送電コイル５と受電コイル１１との距離Ｇを低減することで、発生した磁束が飛び越えるべきギャップを減らすことができる。従って、送電コイル５と受電コイル１１との距離Ｇを調整することで、送電コイル５と受電コイル１１との結合度を向上させることができる。 That is, the power transmission coil 5 and the power reception coil 11 are arranged so as to face each other so as to satisfy the fifth condition. Therefore, by reducing the distance G between the power transmission coil 5 and the power reception coil 11, the gap that the generated magnetic flux should jump over can be reduced. Therefore, by adjusting the distance G between the power transmission coil 5 and the power reception coil 11, the degree of coupling between the power transmission coil 5 and the power reception coil 11 can be improved.
　一対の端子電極１５，１５は、一対の鍔部１４，１４の実装面側、即ち、一対の鍔部１４，１４の１つの外周面１４Ｃ側に配設されている。このとき、受電コイル１１の鍔部１４は、送電コイル５の鍔部８と同様に、巻芯１３よりも端子電極１５側、即ち、鍔部１４の１つの外周面１４Ｃ側（図２では受電コイル１１の上面側）に突出した突出寸法Ａを有している。また、受電コイル１１の巻線１６は、送電コイル５の巻線１０と同一の直径Ｄを有している。従って、受電コイル１１は、第４の条件（Ｄ＜Ａ＜５Ｄ）を満たしている。 The pair of terminal electrodes 15 and 15 are arranged on the mounting surface side of the pair of collar portions 14 and 14, that is, on the outer peripheral surface 14C side of the pair of collar portions 14 and 14. At this time, the flange portion 14 of the power receiving coil 11 is on the terminal electrode 15 side of the winding core 13, that is, on the outer peripheral surface 14C side of one of the flange portions 14, like the flange portion 8 of the power transmission coil 5. It has a protruding dimension A protruding from the upper surface side of the coil 11. Further, the winding 16 of the power receiving coil 11 has the same diameter D as the winding 10 of the power transmission coil 5. Therefore, the power receiving coil 11 satisfies the fourth condition (D <A <5D).
　受電コイル１１の巻線１６は、送電コイル５の巻線１０と同様に、巻芯１３に複数回（図面では６回）巻回されており、両端部（第１端部と第２端部）が一対の端子電極１５，１５にそれぞれ接続されている。このとき、送電コイル５の巻線１０と比較して、受電コイル１１の巻線１６は、巻芯１３に密に巻回されている。即ち、巻き軸方向に対する受電コイル１１の巻線１６の間隔寸法Ｐ２１は、巻き軸方向に対する送電コイル５の巻線１０の間隔寸法Ｐ１１よりも小さい（Ｐ２１＜Ｐ１１）。 Like the winding 10 of the power transmission coil 5, the winding 16 of the power receiving coil 11 is wound around the winding core 13 a plurality of times (6 times in the drawing), and both end portions (first end portion and second end portion) are wound. ) Are connected to the pair of terminal electrodes 15 and 15, respectively. At this time, the winding 16 of the power receiving coil 11 is wound tightly around the winding core 13 as compared with the winding 10 of the power transmission coil 5. That is, the spacing dimension P21 of the winding 16 of the power receiving coil 11 with respect to the winding axis direction is smaller than the spacing dimension P11 of the winding 10 of the power transmission coil 5 with respect to the winding axis direction (P21 <P11).
　より具体的には、巻き軸方向に対する巻線１６の間隔寸法Ｐ２１は、この直径Ｄと同一である（Ｐ２１＝Ｄ）。このため、送電コイル５は第１ないし第５の条件を満しているのに対して、受電コイル１１は第１、第４および第５の条件を満している。 More specifically, the spacing dimension P21 of the winding 16 with respect to the winding axis direction is the same as this diameter D (P21 = D). Therefore, the power transmission coil 5 satisfies the first to fifth conditions, while the power receiving coil 11 satisfies the first, fourth, and fifth conditions.
　次に、第１の実施形態によるアンテナコイル４および比較例によるアンテナコイルについて、実測データに基づいて送電コイル５と受電コイル１１との距離Ｇ（図５ではコイル間距離）および結合度の関係を求めた。非接触型給電に用いる周波数帯を１３．５ＭＨｚ（ＮＦＣ規格）とし、距離Ｇが２ｍｍ以下のときの実測結果の一例を図５に示す。ここで、第１の実施形態によるアンテナコイル４を用いたときの実測結果を図５中に実線で示している。一方、比較例については、比較例によるアンテナコイルを用いたときの実測結果を図５中に二点鎖線で示している。このとき、比較例によるアンテナコイルの送電コイルおよび受電コイルは、第１の実施形態と同じ磁性体コアを有するものの、巻線が磁性体コアの巻芯に密に巻き回されている。具体的には、比較例では、巻き軸方向に対する巻線の間隔寸法は、巻線の直径と同一となっている。 Next, with respect to the antenna coil 4 according to the first embodiment and the antenna coil according to the comparative example, the relationship between the distance G between the power transmission coil 5 and the power reception coil 11 (distance between the coils in FIG. 5) and the degree of coupling is determined based on the measured data. I asked. FIG. 5 shows an example of actual measurement results when the frequency band used for non-contact power feeding is 13.5 MHz (NFC standard) and the distance G is 2 mm or less. Here, the actual measurement results when the antenna coil 4 according to the first embodiment is used are shown by solid lines in FIG. On the other hand, as for the comparative example, the actual measurement result when the antenna coil according to the comparative example is used is shown by a two-dot chain line in FIG. At this time, although the power transmitting coil and the power receiving coil of the antenna coil according to the comparative example have the same magnetic core as in the first embodiment, the windings are tightly wound around the core of the magnetic core. Specifically, in the comparative example, the distance between the windings in the winding axis direction is the same as the diameter of the windings.
　一般的に、結合度（または結合係数）は、絶対値が１よりも小さい値になる。結合度が０のとき、送電コイル５と受電コイル２２とが磁気結合をしていないことを意味している。一方、結合度の絶対値が１のとき、送電コイル５と受電コイル２２とが完全結合状態であることを示している。 Generally, the degree of coupling (or coupling coefficient) has an absolute value smaller than 1. When the degree of coupling is 0, it means that the power transmitting coil 5 and the power receiving coil 22 are not magnetically coupled. On the other hand, when the absolute value of the degree of coupling is 1, it indicates that the power transmitting coil 5 and the power receiving coil 22 are in a completely coupled state.
　図５に示すように、第１の実施形態によるアンテナコイル４では、比較例と比較して、送電コイル５と受電コイル１１との距離Ｇが２ｍｍ以下の区間で、結合度が向上している。即ち、送電コイル５の巻線１０が巻芯７に巻き軸方向に対して間隔をもって巻回されることで、受電コイル１１側に供給される磁束の割合が増えている。 As shown in FIG. 5, in the antenna coil 4 according to the first embodiment, the degree of coupling is improved in a section where the distance G between the power transmission coil 5 and the power reception coil 11 is 2 mm or less, as compared with the comparative example. .. That is, the winding 10 of the power transmission coil 5 is wound around the winding core 7 at intervals in the winding axis direction, so that the ratio of the magnetic flux supplied to the power receiving coil 11 side is increased.
　しかし、第１の実施形態によるアンテナコイル４と、比較例によるアンテナコイルとの双方について、距離Ｇが増加するに従って、磁束が飛び越えるべきギャップが増える。このため、送電コイル５と受電コイル１１との結合度は、距離Ｇが増加するに従って、減少している。従って、第１の実施形態では、このようなギャップを減らすために、送電コイル５および受電コイル１１は、第５の条件（Ｇ＜Ｗ，Ｔ）を満たすように調整されている。 However, with respect to both the antenna coil 4 according to the first embodiment and the antenna coil according to the comparative example, the gap through which the magnetic flux should jump increases as the distance G increases. Therefore, the degree of coupling between the power transmission coil 5 and the power reception coil 11 decreases as the distance G increases. Therefore, in the first embodiment, in order to reduce such a gap, the power transmission coil 5 and the power reception coil 11 are adjusted to satisfy the fifth condition (G <W, T).
　かくして、第１の実施形態によるアンテナコイル４では、送電コイル５は、巻き軸方向に対する巻線１０の間隔寸法Ｐ１１が巻線１０の直径Ｄよりも長くなっている（第２の条件）。送電コイル５は、巻き軸方向に対する鍔部８の長さを幅寸法Ｂとすると、一対の鍔部８，８の幅寸法Ｂがそれぞれ巻き軸方向の巻芯７の長さ寸法Ｌの１／４以下となっている（第１の条件）。送電コイル５は、鍔部８が巻芯７よりも端子電極９側に突出し、鍔部８の突出寸法Ａは、巻線１０の直径Ｄよりも長く、巻線１０の直径Ｄの５倍よりも短くなっている（第４の条件）。送電コイル５および受電コイル１１は、巻き軸方向と直交する奥行方向の長さ寸法Ｗおよび高さ方向の長さ寸法Ｔを有している。送電コイル５と受電コイル１１との距離Ｇが、送電コイル５の奥行方向の長さ寸法Ｗと高さ方向の長さ寸法Ｔ、および、受電コイル１１の奥行方向の長さ寸法Ｗと高さ方向の長さ寸法Ｔのうち最長となる長さ寸法Ｗ（＝Ｔ）よりも短くなるように、送電コイル５および受電コイル１１は、配置される（第５の条件）。 Thus, in the antenna coil 4 according to the first embodiment, in the power transmission coil 5, the spacing dimension P11 of the winding 10 with respect to the winding axis direction is longer than the diameter D of the winding 10 (second condition). Assuming that the length of the flange portion 8 with respect to the winding axis direction of the power transmission coil 5 is the width dimension B, the width dimension B of the pair of collar portions 8 and 8 is 1/1 of the length dimension L of the winding core 7 in the winding axis direction, respectively. It is 4 or less (first condition). In the power transmission coil 5, the flange portion 8 projects toward the terminal electrode 9 from the winding core 7, and the protrusion dimension A of the collar portion 8 is longer than the diameter D of the winding 10 and more than 5 times the diameter D of the winding 10. Is also shorter (fourth condition). The power transmitting coil 5 and the power receiving coil 11 have a length dimension W in the depth direction and a length dimension T in the height direction orthogonal to the winding axis direction. The distance G between the power transmitting coil 5 and the power receiving coil 11 is the length dimension W in the depth direction and the length dimension T in the height direction of the power transmitting coil 5, and the length dimension W and the height in the depth direction of the power receiving coil 11. The power transmitting coil 5 and the power receiving coil 11 are arranged so as to be shorter than the longest length dimension W (= T) of the length dimension T in the direction (fifth condition).
　この構成によれば、送電コイル５は、第２の条件（Ｐ１１＞Ｄ）を満たしている。即ち、送電コイル５の巻線１０は、間隔をもって巻芯７に巻回されている。このため、従来と比較して、発生した磁束が送電コイル５の周囲に拡散する傾向になり、磁束ループの発生を抑制することができる。 According to this configuration, the power transmission coil 5 satisfies the second condition (P11> D). That is, the winding 10 of the power transmission coil 5 is wound around the winding core 7 at intervals. Therefore, as compared with the conventional case, the generated magnetic flux tends to diffuse around the power transmission coil 5, and the generation of the magnetic flux loop can be suppressed.
　また、送電コイル５は、第１の条件（Ｂ≦Ｌ／４）を満たしている。即ち、従来と比較して、送電コイル５の鍔部８のサイズを低減し、鍔部８と鍔部８との間の巻き軸方向の間隔を増加させることができる。これにより、鍔部８と鍔部８との間で発生する磁束を抑制することができる。さらに、送電コイル５は、第５の条件（Ｇ＜Ｗ，Ｔ）を満たしている。即ち、送電コイル５と受電コイル１１との距離Ｇを低減することで、発生した磁束が飛び越えるべきギャップを減らすことができる。以上により、受電コイル１１側に供給される磁束の割合を増やすことができる。 Further, the power transmission coil 5 satisfies the first condition (B ≦ L / 4). That is, the size of the flange portion 8 of the power transmission coil 5 can be reduced and the distance between the flange portion 8 and the collar portion 8 in the winding axis direction can be increased as compared with the conventional case. As a result, the magnetic flux generated between the flange portion 8 and the flange portion 8 can be suppressed. Further, the power transmission coil 5 satisfies the fifth condition (G <W, T). That is, by reducing the distance G between the power transmission coil 5 and the power reception coil 11, the gap that the generated magnetic flux should jump over can be reduced. As described above, the ratio of the magnetic flux supplied to the power receiving coil 11 side can be increased.
　加えて、送電コイル５は、第４の条件（Ｄ＜Ａ＜５Ｄ）を満たしている。即ち、この第４の条件を満たすように鍔部８の突出寸法Ａを調整することで、巻線１０が基板に干渉することなく、面実装が容易にできる。 In addition, the power transmission coil 5 satisfies the fourth condition (D <A <5D). That is, by adjusting the protruding dimension A of the flange portion 8 so as to satisfy the fourth condition, surface mounting can be easily performed without the winding 10 interfering with the substrate.
　この結果、従来と比較して、送電コイル５と受電コイル１１との結合度が向上し、電力伝送効率を向上させることができ、かつ、面実装が容易にできる。 As a result, the degree of coupling between the power transmission coil 5 and the power reception coil 11 is improved as compared with the conventional case, the power transmission efficiency can be improved, and surface mounting can be easily performed.
　第１の実施形態によるアンテナコイル４では、送電コイル５は、巻き軸方向に対する巻線１０の間隔寸法Ｐ１１が巻線１０の直径Ｄの９倍よりも長く、巻き軸方向の巻芯７の長さ寸法Ｌの１／２よりも短くなっている（第３の条件）。 In the antenna coil 4 according to the first embodiment, in the power transmission coil 5, the distance dimension P11 of the winding 10 with respect to the winding axis direction is longer than 9 times the diameter D of the winding 10, and the length of the winding core 7 in the winding axis direction. It is shorter than 1/2 of the dimension L (third condition).
　この構成によれば、送電コイル５は、第２の条件（Ｄ＜Ａ＜５Ｄ）に加えて第３の条件（９Ｄ＜Ｐ１１＜Ｌ／２）を満たしている。言い換えれば、巻き軸方向に対する巻線１０の間隔をさらにあけてもよい（即ち、間隔寸法Ｐ１１をさらに増やしてもよい）。第３の条件（９Ｄ＜Ｐ１１＜Ｌ／２）を満たすように、この間隔寸法Ｐ１１を調整することで、送電コイル５と受電コイル１１との結合度を向上させることができる。 According to this configuration, the power transmission coil 5 satisfies the third condition (9D <P11 <L / 2) in addition to the second condition (D <A <5D). In other words, the windings 10 may be further spaced with respect to the winding axis direction (that is, the spacing dimension P11 may be further increased). By adjusting the interval dimension P11 so as to satisfy the third condition (9D <P11 <L / 2), the degree of coupling between the power transmission coil 5 and the power reception coil 11 can be improved.
　次に、図６および図７は、本発明の第２の実施形態による非接触型給電アンテナコイルを示している。第２の実施形態の特徴は、送電コイル側だけでなく、受電コイル側も、巻線が巻芯に間隔をもって巻回される構成としたことにある。なお、第２の実施形態では、前述した第１の実施形態と同一の構成については同一の符号を付し、その説明は省略する。 Next, FIGS. 6 and 7 show a non-contact type feeding antenna coil according to the second embodiment of the present invention. The feature of the second embodiment is that not only the power transmission coil side but also the power reception coil side is configured such that the windings are wound around the winding core at intervals. In the second embodiment, the same components as those in the first embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.
　図６に示すように、第２の実施形態による非接触型給電アンテナコイル２１（以下、アンテナコイル２１という）は、送電コイル５と、送電コイル５と対面した状態で配置される受電コイル２２とを備えている。 As shown in FIG. 6, the non-contact type feeding antenna coil 21 (hereinafter referred to as antenna coil 21) according to the second embodiment includes a power transmission coil 5 and a power receiving coil 22 arranged so as to face the power transmission coil 5. It has.
　ここで、前述した第１の実施形態の受電コイル１１の巻線１６は、巻芯１３に密に巻回されていた。これに対して、第２の実施形態の受電コイル２２の巻線２３は、送電コイル５と同様に、巻き軸方向に対して間隔をもって巻回されている。巻線２３は、巻き軸方向に対して間隔寸法Ｐ１２と、送電コイル５と同一の直径Ｄとを有している。このとき、以下の数６の式に示すように、巻き軸方向に対する巻線２３の間隔寸法Ｐ１２は、巻線２３の直径Ｄよりも長くなっている（以下、第２’の条件という）。 Here, the winding 16 of the power receiving coil 11 of the first embodiment described above was tightly wound around the winding core 13. On the other hand, the winding 23 of the power receiving coil 22 of the second embodiment is wound at intervals in the winding axis direction, similarly to the power transmission coil 5. The winding 23 has an interval dimension P12 with respect to the winding axis direction and a diameter D same as that of the power transmission coil 5. At this time, as shown in the following equation of Equation 6, the distance dimension P12 of the winding 23 with respect to the winding axis direction is longer than the diameter D of the winding 23 (hereinafter, referred to as the second condition).
Figure JPOXMLDOC01-appb-M000006
Figure JPOXMLDOC01-appb-M000006
　なお、巻き軸方向に対する巻線２３の間隔をさらにあけてもよい（即ち、間隔寸法Ｐ１２をさらに増やしてもよい）。具体的には、巻き軸方向に対する巻線２３の間隔寸法Ｐ１２は、数７の式に示すように、巻線２３の直径Ｄの９倍よりも長く、巻き軸方向の巻芯１３の長さ寸法Ｌの１／２よりも短くなっていてもよい（以下、第３’の条件という）。 The spacing between the windings 23 with respect to the winding axis direction may be further increased (that is, the spacing dimension P12 may be further increased). Specifically, the distance dimension P12 of the winding 23 with respect to the winding axis direction is longer than 9 times the diameter D of the winding 23 as shown in the equation of Equation 7, and the length of the winding core 13 in the winding axis direction. It may be shorter than 1/2 of the dimension L (hereinafter referred to as the third'condition).
Figure JPOXMLDOC01-appb-M000007
Figure JPOXMLDOC01-appb-M000007
　また、第２の実施形態では、受電コイル２２も、送電コイル５と同様に、第１の条件（Ｂ≦Ｌ／４）、第４の条件（Ｄ＜Ａ＜５Ｄ）、第５の条件（Ｇ＜Ｗ，Ｔ）を満たしている。 Further, in the second embodiment, the power receiving coil 22 also has the first condition (B ≦ L / 4), the fourth condition (D <A <5D), and the fifth condition (similar to the power transmission coil 5). G <W, T) is satisfied.
　次に、第２の実施形態によるアンテナコイル２１、第１の実施形態によるアンテナコイル４および比較例によるアンテナコイルについて、実測データに基づいて送電コイル５と受電コイル２２との距離Ｇ（図７ではコイル間距離）および結合度の関係を求めた。このときの実測結果の一例を図７に示す。実測データを取得した条件は、図５と同じ（距離Ｇを２ｍｍ以下、周波数域を１３．５ＭＨｚ）である。ここで、第２の実施形態によるアンテナコイル２１を用いたときの実測結果は、図７中に破線で示している。一方、第１の実施形態によるアンテナコイル４および比較例によるアンテナコイルを用いたときの実測結果については、前述した図５に示す実測結果と同一であるため、説明を省略する。 Next, with respect to the antenna coil 21 according to the second embodiment, the antenna coil 4 according to the first embodiment, and the antenna coil according to the comparative example, the distance G between the power transmitting coil 5 and the power receiving coil 22 based on the measured data (in FIG. 7). The relationship between the distance between the coils) and the degree of coupling was determined. An example of the actual measurement result at this time is shown in FIG. The conditions for acquiring the measured data are the same as in FIG. 5 (distance G is 2 mm or less, frequency range is 13.5 MHz). Here, the actual measurement result when the antenna coil 21 according to the second embodiment is used is shown by a broken line in FIG. On the other hand, the actual measurement results when the antenna coil 4 according to the first embodiment and the antenna coil according to the comparative example are used are the same as the actual measurement results shown in FIG. 5 described above, and thus the description thereof will be omitted.
　図７に示すように、第２の実施形態によるアンテナコイル２１を用いたとき、従来（比較例）と比較して、送電コイル５と受電コイル２２との距離Ｇが２ｍｍ以下の区間で、結合度が向上している。即ち、送電コイル５の巻線１０が巻芯７に巻き軸方向に対して間隔をもって巻回されると共に、受電コイル２２の巻線２３が巻芯１３に巻き軸方向に対して間隔をもって巻回されることで、受電コイル２２側に供給される磁束の割合が増えている。 As shown in FIG. 7, when the antenna coil 21 according to the second embodiment is used, it is coupled in a section where the distance G between the power transmission coil 5 and the power reception coil 22 is 2 mm or less as compared with the conventional (comparative example). The degree is improving. That is, the winding 10 of the power transmission coil 5 is wound around the winding core 7 at intervals in the winding axis direction, and the winding 23 of the power receiving coil 22 is wound around the winding core 13 at intervals in the winding axis direction. As a result, the proportion of magnetic flux supplied to the power receiving coil 22 side is increasing.
　特に、第２の実施形態によるアンテナコイル２１では、第１の実施形態と比較して、送電コイル５と受電コイル２２との距離Ｇが１ｍｍ程度よりも短い区間で、結合度が高くなっている。即ち、この距離Ｇを調整することで、送電コイル５と受電コイル２２との結合度を向上させることができる。 In particular, in the antenna coil 21 according to the second embodiment, the degree of coupling is higher in a section where the distance G between the power transmitting coil 5 and the power receiving coil 22 is shorter than about 1 mm, as compared with the first embodiment. .. That is, by adjusting this distance G, the degree of coupling between the power transmission coil 5 and the power reception coil 22 can be improved.
　かくして、第２の実施形態でも第１の実施形態と同様に、面実装が容易になると共に、送電コイル５と受電コイル２２との結合度と電力伝送効率を向上させることができる。第２の実施形態では、受電コイル２２は、巻き軸方向に対する巻線２３の間隔寸法Ｐ１２が巻線２３の直径Ｄよりも長くなっている（第２’の条件）。受電コイル２２は、巻き軸方向に対する鍔部１４の長さを幅寸法Ｂとすると、一対の鍔部１４，１４の幅寸法Ｂがそれぞれ巻き軸方向の巻芯１３の長さ寸法Ｌの１／４以下となっている（第１の条件）。受電コイル２２は、鍔部１４が巻芯１３よりも端子電極１５側に突出し、鍔部１４の突出寸法Ａは、巻線２３の直径Ｄよりも長く、巻線２３の直径Ｄの５倍よりも短くなっている（第４の条件）。送電コイル５および受電コイル２２は、巻き軸方向と直交する奥行方向の長さ寸法Ｗおよび高さ方向の長さ寸法Ｔを有している。送電コイル５と受電コイル２２との距離Ｇが、送電コイル５の奥行方向の長さ寸法Ｗと高さ方向の長さ寸法Ｔ、および、受電コイル２２の奥行方向の長さ寸法Ｗと高さ方向の長さ寸法Ｔのうち最長となる長さ寸法Ｗ（＝Ｔ）よりも短くなるように、送電コイル５および受電コイル２２は、配置される（第５の条件）。 Thus, in the second embodiment as in the first embodiment, surface mounting can be facilitated, and the degree of coupling between the power transmission coil 5 and the power reception coil 22 and the power transmission efficiency can be improved. In the second embodiment, in the power receiving coil 22, the distance dimension P12 of the winding 23 with respect to the winding axis direction is longer than the diameter D of the winding 23 (second condition). Assuming that the length of the flange portion 14 with respect to the winding axis direction of the power receiving coil 22 is the width dimension B, the width dimension B of the pair of flange portions 14 and 14 is 1/1 of the length dimension L of the winding core 13 in the winding axis direction, respectively. It is 4 or less (first condition). In the power receiving coil 22, the flange portion 14 projects toward the terminal electrode 15 from the winding core 13, and the protrusion dimension A of the collar portion 14 is longer than the diameter D of the winding 23 and more than 5 times the diameter D of the winding 23. Is also shorter (fourth condition). The power transmission coil 5 and the power reception coil 22 have a length dimension W in the depth direction and a length dimension T in the height direction orthogonal to the winding axis direction. The distance G between the power transmitting coil 5 and the power receiving coil 22 is the length dimension W in the depth direction and the length dimension T in the height direction of the power transmitting coil 5, and the length dimension W and the height in the depth direction of the power receiving coil 22. The power transmitting coil 5 and the power receiving coil 22 are arranged so as to be shorter than the longest length dimension W (= T) of the length dimension T in the direction (fifth condition).
　この構成によれば、受電コイル２２は、送電コイル５と同様に、第１，第２’，第４，第５の条件を満たしている。即ち、送電コイル５だけでなく、受電コイル２２の巻線２３も、巻き軸方向に対して間隔をもって巻芯１３に巻回されている。このため、送電コイル５と受電コイル２２との結合度を調整できる。これにより、従来と比較して、送電コイル５と受電コイル２２との結合度を向上させることができる。 According to this configuration, the power receiving coil 22 satisfies the first, second', fourth, and fifth conditions as well as the power transmission coil 5. That is, not only the power transmission coil 5 but also the winding 23 of the power receiving coil 22 is wound around the winding core 13 at intervals in the winding axis direction. Therefore, the degree of coupling between the power transmission coil 5 and the power reception coil 22 can be adjusted. As a result, the degree of coupling between the power transmission coil 5 and the power reception coil 22 can be improved as compared with the conventional case.
　第２の実施形態によるアンテナコイル２１では、受電コイル２２は、巻き軸方向に対する巻線２３の間隔寸法Ｐ１２が巻線２３の直径Ｄの９倍よりも長く、巻き軸方向の巻芯１３の長さ寸法Ｌの１／２よりも短くなる（第３’の条件）。 In the antenna coil 21 according to the second embodiment, in the power receiving coil 22, the distance dimension P12 of the winding 23 with respect to the winding axis direction is longer than 9 times the diameter D of the winding 23, and the length of the winding core 13 in the winding axis direction. It is shorter than 1/2 of the dimension L (third condition).
　この構成によれば、受電コイル２２は、第３’の条件（９Ｄ＜Ｐ１２＜Ｌ／２）を満たしている。言い換えれば、巻き軸方向に対する巻線２３の間隔をさらにあけてもよい（即ち、間隔寸法Ｐ１２をさらに増やしてもよい）。第３’の条件（９Ｄ＜Ｐ１２＜Ｌ／２）を満たすように、この間隔寸法Ｐ１２を調整することで、送電コイル５と受電コイル２２との結合度を向上させることができる。 According to this configuration, the power receiving coil 22 satisfies the third condition (9D <P12 <L / 2). In other words, the windings 23 may be further spaced with respect to the winding axis direction (that is, the spacing dimension P12 may be further increased). By adjusting the interval dimension P12 so as to satisfy the third condition (9D <P12 <L / 2), the degree of coupling between the power transmission coil 5 and the power reception coil 22 can be improved.
　次に、図８は、本発明の第３の実施形態による非接触型給電アンテナコイルを示している。第３の実施形態の特徴は、３つの受電コイルが１つの送電コイルの周囲に配置される構成としたことにある。なお、第３の実施形態では、前述した第２の実施形態と同一の構成については同一の符号を付し、その説明は省略する。 Next, FIG. 8 shows a non-contact type feeding antenna coil according to the third embodiment of the present invention. The feature of the third embodiment is that three power receiving coils are arranged around one power transmission coil. In the third embodiment, the same components as those in the second embodiment described above are designated by the same reference numerals, and the description thereof will be omitted.
　図８に示すように、第３の実施形態による非接触型給電アンテナコイル３１（以下、アンテナコイル３１という）は、１つの送電コイル５と、３つの受電コイル２２，２２，２２（図８では、上側の受電コイル２２、左側の受電コイル２２、右側の受電コイル２２）とにより構成されている。このとき、３つの受電コイル２２，２２，２２は、直方体形状に形成された筐体３２の内部に設けられている。この筐体３２の下面部には、送電コイル５を配置するための溝部３２Ａが形成されている。この溝部３２Ａは、この筐体３２の中央付近を真直ぐ（図８の前後方向）に延びて設けられている。 As shown in FIG. 8, the non-contact type feeding antenna coil 31 (hereinafter referred to as antenna coil 31) according to the third embodiment has one power transmitting coil 5 and three power receiving coils 22, 22, 22 (in FIG. 8). , The upper power receiving coil 22, the left side power receiving coil 22, and the right side power receiving coil 22). At this time, the three power receiving coils 22, 22, 22 are provided inside the housing 32 formed in a rectangular parallelepiped shape. A groove 32A for arranging the power transmission coil 5 is formed on the lower surface of the housing 32. The groove portion 32A is provided so as to extend straight (in the front-rear direction in FIG. 8) near the center of the housing 32.
　なお、第３の実施形態では、３つの受電コイル２２，２２，２２は、単一のデバイス（受電装置）に取り付けられているが、それぞれ異なるデバイスに取り付けられる構成としてもよい。 Although the three power receiving coils 22, 22, and 22 are attached to a single device (power receiving device) in the third embodiment, they may be attached to different devices.
　送電コイル５の周囲には、３つの受電コイル２２，２２，２２が配置されている。このとき、これら３つの受電コイル２２，２２，２２は、送電コイル５の各端子電極９，９が配設された外周面８Ａを除く３つの外周面８Ｂ，８Ｃ，８Ｄとそれぞれ対面している。 Three power receiving coils 22, 22, 22 are arranged around the power transmission coil 5. At this time, these three power receiving coils 22, 22, 22 face each of the three outer peripheral surfaces 8B, 8C, 8D except for the outer peripheral surface 8A on which the terminal electrodes 9 and 9 of the power transmission coil 5 are arranged. ..
　この場合、上側の受電コイル２２は、第１および第２の実施形態と同様に、送電コイル５の鍔部８の結合面となる外周面８Ｃと対面している。より具体的には、上側の受電コイル２２は、この受電コイル２２の鍔部１４の結合面となる外周面１４Ａと、送電コイル５の鍔部８の外周面８Ｃとが対面した状態で、送電コイル５の上方に配置されている。このとき、奥行方向の長さ寸法Ｗ（＝高さ方向の長さ寸法Ｔ）分の磁束が、送電コイル５から上側の受電コイル２２に向かう。 In this case, the upper power receiving coil 22 faces the outer peripheral surface 8C which is the coupling surface of the flange portion 8 of the power transmission coil 5, as in the first and second embodiments. More specifically, the upper power receiving coil 22 transmits power in a state where the outer peripheral surface 14A serving as the coupling surface of the flange portion 14 of the power receiving coil 22 and the outer peripheral surface 8C of the flange portion 8 of the power transmission coil 5 face each other. It is arranged above the coil 5. At this time, the magnetic flux corresponding to the length dimension W (= length dimension T in the height direction) in the depth direction is directed from the power transmission coil 5 to the power receiving coil 22 on the upper side.
　左側の受電コイル２２は、上側の受電コイル２２の上，下が反転した状態で送電コイル５の左側に配置されている。即ち、左側の受電コイル２２は、端子電極１５が配設された実装面となる外周面１４Ｃが下方に向いている。 The power receiving coil 22 on the left side is arranged on the left side of the power transmission coil 5 with the upper and lower sides of the power receiving coil 22 inverted. That is, the power receiving coil 22 on the left side has the outer peripheral surface 14C, which is the mounting surface on which the terminal electrode 15 is arranged, facing downward.
　このとき、左側の受電コイル２２は、送電コイル５の鍔部８の外周面８Ｂ（図８では送電コイル５の左側面）と対面している。受電コイル２２の鍔部１４の外周面１４Ｂ（図８では左側の受電コイル２２の右側面）と、送電コイル５の鍔部８の外周面８Ｂとが対面した状態で、左側の受電コイル２２は、送電コイル５の左側に配置されている。 At this time, the power receiving coil 22 on the left side faces the outer peripheral surface 8B (the left side surface of the power transmission coil 5 in FIG. 8) of the flange portion 8 of the power transmission coil 5. The power receiving coil 22 on the left side is in a state where the outer peripheral surface 14B of the flange portion 14 of the power receiving coil 22 (the right side surface of the power receiving coil 22 on the left side in FIG. 8) and the outer peripheral surface 8B of the flange portion 8 of the power transmission coil 5 face each other. , Is located on the left side of the power transmission coil 5.
　右側の受電コイル２２も、左側の受電コイル２２と同様に、上側の受電コイル２２の上，下が反転した状態で送電コイル５の右側に配置されている。即ち、右側の受電コイル２２は、端子電極１５が配設された実装面となる外周面１４Ｃが下方に向いている。 Like the power receiving coil 22 on the left side, the power receiving coil 22 on the right side is also arranged on the right side of the power transmitting coil 5 with the upper and lower sides of the power receiving coil 22 inverted. That is, the power receiving coil 22 on the right side has the outer peripheral surface 14C, which is the mounting surface on which the terminal electrode 15 is arranged, facing downward.
　このとき、右側の受電コイル２２は、送電コイル５の鍔部８の外周面８Ｄ（図８では送電コイル５の右側面）と対面している。受電コイル２２の鍔部１４の外周面１４Ｄ（図８では右側の受電コイル２２の左側面）と、送電コイル５の鍔部８の外周面８Ｄとが対面した状態で、右側の受電コイル２２は、送電コイル５の右側に配置されている。このとき、高さ方向の長さ寸法Ｔ（＝奥行方向の長さ寸法Ｗ）分の磁束が、送電コイル５から左側の受電コイル２２と右側の受電コイル２２にそれぞれ向かう。 At this time, the power receiving coil 22 on the right side faces the outer peripheral surface 8D of the flange portion 8 of the power transmission coil 5 (the right side surface of the power transmission coil 5 in FIG. 8). The power receiving coil 22 on the right side is in a state where the outer peripheral surface 14D of the flange portion 14 of the power receiving coil 22 (the left side surface of the power receiving coil 22 on the right side in FIG. 8) and the outer peripheral surface 8D of the flange portion 8 of the power transmission coil 5 face each other. , Is located on the right side of the power transmission coil 5. At this time, the magnetic flux corresponding to the length dimension T (= length dimension W in the depth direction) in the height direction is directed from the power transmission coil 5 to the power receiving coil 22 on the left side and the power receiving coil 22 on the right side, respectively.
　かくして、第３の実施形態でも第１および第２の実施形態と同様に、面実装が容易になると共に、送電コイル５と受電コイル２２との結合度と電力伝送効率を向上させることができる。第３の実施形態によるアンテナコイル３１では、送電コイル５の周囲には、端子電極９が配設された鍔部８の外周面８Ａを除く３つの外周面８Ｂ，８Ｃ，８Ｄとそれぞれ対面した状態で、３つの受電コイル２２，２２，２２が配置されている。 Thus, in the third embodiment as in the first and second embodiments, surface mounting can be facilitated, and the degree of coupling between the power transmission coil 5 and the power reception coil 22 and the power transmission efficiency can be improved. In the antenna coil 31 according to the third embodiment, the power transmission coil 5 is in a state of facing three outer peripheral surfaces 8B, 8C, 8D except for the outer peripheral surface 8A of the collar portion 8 on which the terminal electrode 9 is arranged. Then, three power receiving coils 22, 22, 22 are arranged.
　この構成によれば、１つの送電コイル５の周囲に３つの受電コイル２２，２２，２２を配置できる。これにより、アンテナコイル３１は、送電コイル５と３つの受電コイル２２，２２，２２との間で非接触で電力を供給できる。 According to this configuration, three power receiving coils 22, 22, 22 can be arranged around one power transmission coil 5. As a result, the antenna coil 31 can supply electric power between the power transmission coil 5 and the three power receiving coils 22, 22, 22 in a non-contact manner.
　第３の実施形態によるアンテナコイル３１では、送電コイル５の奥行方向の長さ寸法Ｗと高さ方向の長さ寸法Ｔ、および、受電コイル２２，２２，２２の奥行方向の長さ寸法Ｗと高さ方向の長さ寸法Ｔが同一である（Ｗ＝Ｔ）。 In the antenna coil 31 according to the third embodiment, the length dimension W in the depth direction of the transmission coil 5, the length dimension T in the height direction, and the length dimension W in the depth direction of the power receiving coils 22, 22, 22 The length dimension T in the height direction is the same (W = T).
　この構成によれば、送電コイル５の鍔部８から上側の受電コイル２２に向かう磁束の大きさと、送電コイル５の鍔部８から左側の受電コイル２２と右側の受電コイル２２に向かう磁束の大きさとが、ほぼ等しくなる。これにより、送電コイル５と上側の受電コイル２２との結合度と、送電コイル５と左側の受電コイル２２との結合度と、送電コイル５と右側の受電コイル２２との結合度とが、極端に異なることを防ぐことができる。即ち、３つの受電コイル２２，２２，２２に対する結合度の強弱の片寄りを最小限に抑えた状態で、送電コイル５と３つの受電コイル２２，２２，２２との間で非接触型給電を行うことができる。 According to this configuration, the magnitude of the magnetic flux from the flange 8 of the power transmission coil 5 toward the upper power receiving coil 22 and the magnitude of the magnetic flux from the flange 8 of the power transmission coil 5 toward the left power receiving coil 22 and the right power receiving coil 22. Sato is almost equal. As a result, the degree of coupling between the power transmission coil 5 and the upper power receiving coil 22, the degree of coupling between the power transmission coil 5 and the left power receiving coil 22, and the degree of coupling between the power transmission coil 5 and the right power receiving coil 22 are extremely high. Can be prevented from being different. That is, non-contact power supply is supplied between the power transmission coil 5 and the three power receiving coils 22, 22, 22 while minimizing the deviation of the degree of coupling with respect to the three power receiving coils 22, 22, 22. It can be carried out.
　なお、前記第１の実施形態では、送電コイル５の巻芯７および受電コイル１１の巻芯１３が四角形の柱状にそれぞれ形成された場合を例に挙げて説明した。本発明はこれに限らず、例えば、巻芯を円形、楕円形等の柱状に形成してもよい。このことは、第２，第３の実施形態についても同様である。 In the first embodiment, the case where the winding core 7 of the power transmission coil 5 and the winding core 13 of the power receiving coil 11 are formed in a quadrangular columnar shape has been described as an example. The present invention is not limited to this, and for example, the winding core may be formed in a columnar shape such as a circular shape or an elliptical shape. This also applies to the second and third embodiments.
　前記第１の実施形態では、送電コイル５の鍔部８が４つの外周面８Ａ，８Ｂ，８Ｃ，８Ｄを有する四角形の筒状に形成され、受電コイル１１の鍔部１４が４つの外周面１４Ａ，１４Ｂ，１４Ｃ，１４Ｄを有する四角形の筒状に形成された場合を例に挙げて説明した。本発明はこれに限らず、例えば、送電コイルの鍔部および受電コイルの鍔部は、実装面側と結合面側とにそれぞれ突出し、他の方向には突出しない構成としてもよい。このことは、第２，第３の実施形態についても同様である。 In the first embodiment, the flange portion 8 of the power transmission coil 5 is formed in a quadrangular tubular shape having four outer peripheral surfaces 8A, 8B, 8C, 8D, and the flange portion 14 of the power receiving coil 11 has four outer peripheral surfaces 14A. , 14B, 14C, 14D, and the case of being formed in a quadrangular tubular shape have been described as an example. The present invention is not limited to this, and for example, the flange portion of the power transmission coil and the flange portion of the power receiving coil may be configured to project toward the mounting surface side and the coupling surface side, respectively, and do not project in other directions. This also applies to the second and third embodiments.
　前記第１の実施形態では、送電コイル５および受電コイル１１の奥行方向の長さ寸法Ｗが送電コイル５および受電コイル１１の高さ方向の長さ寸法Ｔと同一となる構成とした。また、前記第１の実施形態では、受電コイル１１の奥行方向の長さ寸法Ｗを送電コイル５の奥行方向の長さ寸法Ｗと同じ値とし、受電コイル１１の高さ方向の長さ寸法Ｔを送電コイル５の高さ方向の長さ寸法Ｔと同じ値とした構成とした。本発明はこれに限らず、例えば、この奥行方向の長さ寸法とこの高さ方向の長さ寸法とを異ならせてもよい。また、受電コイルの奥行方向の長さ寸法を送電コイルの奥行方向の長さ寸法と異なる値とし、受電コイルの高さ方向の長さ寸法を送電コイルの高さ方向の長さ寸法と異なる値とした構成としてもよい。このことは、第２，第３の実施形態についても同様である。 In the first embodiment, the length dimension W in the depth direction of the power transmission coil 5 and the power receiving coil 11 is the same as the length dimension T in the height direction of the power transmission coil 5 and the power receiving coil 11. Further, in the first embodiment, the length dimension W in the depth direction of the power receiving coil 11 is set to the same value as the length dimension W in the depth direction of the power transmitting coil 5, and the length dimension T in the height direction of the power receiving coil 11 is set. Was set to the same value as the length dimension T in the height direction of the power transmission coil 5. The present invention is not limited to this, and for example, the length dimension in the depth direction and the length dimension in the height direction may be different. Further, the length dimension in the depth direction of the power receiving coil is set to a value different from the length dimension in the depth direction of the power transmitting coil, and the length dimension in the height direction of the power receiving coil is a value different from the length dimension in the height direction of the power transmitting coil. It may be configured as. This also applies to the second and third embodiments.
　前記各実施形態で記載した具体的な数値は、一例を示したものであり、例示した値に限らない。 The specific numerical values described in each of the above embodiments show an example, and are not limited to the illustrated values.
　前記第１の実施形態では、アンテナコイル４を、端末１（小型端末）およびタッチペン２を用いたタッチペン充電に適用した場合を例に挙げて説明した。本発明はこれに限らず、例えば、ワイヤレスイヤホン、ワイヤレスヘッドホン等の小型かつ省電力機器向けの非接触型給電に適用してもよい。このことは、第２，第３の実施形態についても同様である。 In the first embodiment, the case where the antenna coil 4 is applied to the touch pen charging using the terminal 1 (small terminal) and the touch pen 2 has been described as an example. The present invention is not limited to this, and may be applied to, for example, non-contact power supply for small and power-saving devices such as wireless earphones and wireless headphones. This also applies to the second and third embodiments.
　前記各実施形態は例示であり、異なる実施形態で示した構成の部分的な置換または組み合わせが可能であることは言うまでもない。 It goes without saying that each of the above embodiments is an example, and partial replacement or combination of the configurations shown in different embodiments is possible.
　次に、上記実施形態に含まれる非接触型給電アンテナコイルとして、例えば、以下に述べる態様のものが考えられる。 Next, as the non-contact type feeding antenna coil included in the above embodiment, for example, the one described below can be considered.
　第１の態様としては、送電コイルと受電コイルとを備え、前記送電コイルと前記受電コイルとの間で非接触で電力を供給する非接触型給電アンテナコイルにおいて、前記送電コイルは、柱状の巻芯と前記巻芯の両端に配設された一対の鍔部とを有する磁性体コアと、前記一対の鍔部の実装面側に配設された一対の端子電極と、前記巻芯に巻回され、両端部が前記一対の端子電極にそれぞれ接続される巻線と、を有し、前記受電コイルは、柱状の巻芯と前記巻芯の両端に配設された一対の鍔部とを有する磁性体コアと、前記一対の鍔部の実装面側に配設された一対の端子電極と、前記巻芯に巻回され、両端部が前記一対の端子電極にそれぞれ接続される巻線と、を有し、前記送電コイルは、巻き軸方向に対する前記巻線の間隔寸法が前記巻線の直径よりも長くなっており、巻き軸方向に対する前記鍔部の長さを幅寸法とすると、前記一対の鍔部の幅寸法がそれぞれ巻き軸方向の前記巻芯の長さ寸法の１／４以下となっており、前記鍔部が前記巻芯よりも前記端子電極側に突出し、前記鍔部の突出寸法は、前記巻線の直径よりも長く、前記巻線の直径の５倍よりも短くなっており、前記送電コイルおよび前記受電コイルは、巻き軸方向と直交する奥行方向および高さ方向の長さ寸法を有し、前記送電コイルと前記受電コイルとの距離が、前記送電コイルの奥行方向の長さ寸法と高さ方向の長さ寸法、および、前記受電コイルの奥行方向の長さ寸法と高さ方向の長さ寸法のうち最長となる長さ寸法よりも短くなるように、配置されることを特徴としている。 As a first aspect, in a non-contact power feeding antenna coil including a power transmitting coil and a power receiving coil and supplying power between the power transmitting coil and the power receiving coil in a non-contact manner, the power transmitting coil is wound in a columnar shape. A magnetic core having a core and a pair of flanges arranged at both ends of the winding core, a pair of terminal electrodes arranged on the mounting surface side of the pair of collars, and winding around the winding core. The power receiving coil has a columnar winding core and a pair of collar portions arranged at both ends of the winding core. A magnetic core, a pair of terminal electrodes arranged on the mounting surface side of the pair of flanges, a winding wound around the winding core, and both ends connected to the pair of terminal electrodes, respectively. The transmission coil has the winding spacing dimension longer than the winding diameter in the winding axis direction, and the length of the flange portion in the winding axis direction is the width dimension. The width dimension of the flange portion of the coil portion is 1/4 or less of the length dimension of the winding core in the winding axis direction, the collar portion projects from the winding core toward the terminal electrode side, and the flange portion protrudes. The dimensions are longer than the diameter of the winding and shorter than 5 times the diameter of the winding, and the transmission coil and the power receiving coil are lengths in the depth direction and the height direction orthogonal to the winding axis direction. The distance between the power transmitting coil and the power receiving coil is the length dimension in the depth direction and the length dimension in the height direction of the power transmitting coil, and the length dimension in the depth direction of the power receiving coil. It is characterized in that it is arranged so as to be shorter than the longest length dimension of the length dimensions in the height direction.
　この第１の態様によれば、送電コイルの巻線は、間隔をもって巻芯に巻回されている。このため、従来と比較して、発生した磁束が送電コイルの周囲に拡散する傾向になり、磁束ループの発生を抑制することができる。 According to this first aspect, the windings of the power transmission coil are wound around the winding core at intervals. Therefore, as compared with the conventional case, the generated magnetic flux tends to diffuse around the power transmission coil, and the generation of the magnetic flux loop can be suppressed.
　また、従来と比較して、送電コイルの鍔部のサイズを低減し、一対の鍔部の間の巻き軸方向の間隔を増加させることができる。これにより、一対の鍔部の間で発生する磁束を抑制することができる。さらに、送電コイルと受電コイルとの距離を低減することで、発生した磁束が飛び越えるべきギャップを減らすことができる。以上により、受電コイル側に供給される磁束の割合を増やすことができる。 In addition, the size of the flange portion of the power transmission coil can be reduced and the distance between the pair of flange portions in the winding axis direction can be increased as compared with the conventional case. As a result, the magnetic flux generated between the pair of flanges can be suppressed. Further, by reducing the distance between the power transmission coil and the power reception coil, the gap that the generated magnetic flux should jump over can be reduced. As described above, the ratio of the magnetic flux supplied to the power receiving coil side can be increased.
　加えて、鍔部の突出寸法を調整することで、巻線が基板に干渉することなく、面実装が容易にできる。 In addition, by adjusting the protruding dimension of the collar, surface mounting can be easily performed without the windings interfering with the board.
　この結果、従来と比較して、送電コイルと受電コイルとの結合度が向上し、電力伝送効率を向上させることができ、かつ、面実装が容易にできる。 As a result, the degree of coupling between the power transmission coil and the power reception coil is improved as compared with the conventional case, the power transmission efficiency can be improved, and surface mounting can be easily performed.
　第２の態様としては、第１の態様において、前記受電コイルは、巻き軸方向に対する前記巻線の間隔寸法が前記巻線の直径よりも長くなっており、巻き軸方向に対する前記鍔部の長さを幅寸法とすると、前記一対の鍔部の幅寸法がそれぞれ巻き軸方向の前記巻芯の長さ寸法の１／４以下となっており、前記鍔部が前記巻芯よりも前記端子電極側に突出し、前記鍔部の突出寸法は、前記巻線の直径よりも長く、前記巻線の直径の５倍よりも短くなっており、前記送電コイルおよび前記受電コイルは、巻き軸方向と直交する奥行方向および高さ方向の長さ寸法を有し、前記送電コイルと前記受電コイルとの距離が、前記送電コイルの奥行方向の長さ寸法と高さ方向の長さ寸法、および、前記受電コイルの奥行方向の長さ寸法と高さ方向の長さ寸法のうち最長となる長さ寸法よりも短くなるように、配置されることを特徴としている。 In the second aspect, in the first aspect, in the power receiving coil, the distance between the windings in the winding axis direction is longer than the diameter of the windings, and the length of the collar portion in the winding axis direction. When the width dimension is defined as the width dimension, the width dimension of the pair of collar portions is 1/4 or less of the length dimension of the winding core in the winding axis direction, and the collar portion is more than the winding core and the terminal electrode. Protruding to the side, the protruding dimension of the flange portion is longer than the diameter of the winding and shorter than 5 times the diameter of the winding, and the transmitting coil and the power receiving coil are orthogonal to the winding axis direction. It has length dimensions in the depth direction and height direction, and the distance between the power transmission coil and the power receiving coil is the length dimension in the depth direction and the length direction in the height direction of the power transmission coil, and the power reception. It is characterized in that the coil is arranged so as to be shorter than the longest of the length dimension in the depth direction and the length dimension in the height direction.
　この第２の態様によれば、送電コイルだけでなく、受電コイルの巻線も、巻き軸方向に対して間隔をもって巻芯に巻回されている。このため、送電コイルと受電コイルとの結合度を調整できる。これにより、従来と比較して、送電コイルと受電コイルとの結合度を向上させることができる。 According to this second aspect, not only the power transmission coil but also the winding of the power receiving coil is wound around the winding core at intervals in the winding axis direction. Therefore, the degree of coupling between the power transmission coil and the power reception coil can be adjusted. As a result, the degree of coupling between the power transmission coil and the power reception coil can be improved as compared with the conventional case.
　第３の態様としては、第１または第２の態様において、前記送電コイルおよび前記受電コイルの前記磁性体コアは、４つの外周面を有する四角形の筒状に形成された前記鍔部を有しており、前記鍔部の１つの外周面には、前記端子電極が配設されており、前記送電コイルの周囲には、前記端子電極が配設された外周面を除く３つの外周面とそれぞれ対面した状態で、３つの前記受電コイルが配置されることを特徴としている。 In a third aspect, in the first or second aspect, the power transmission coil and the magnetic core of the power receiving coil have the flange portion formed in a quadrangular tubular shape having four outer peripheral surfaces. The terminal electrodes are arranged on one outer peripheral surface of the flange portion, and three outer peripheral surfaces other than the outer peripheral surface on which the terminal electrodes are arranged are arranged around the power transmission coil. It is characterized in that the three power receiving coils are arranged in a facing state.
　この第３の態様によれば、１つの送電コイルの周囲に３つの受電コイルを配置できる。これにより、非接触型給電アンテナコイルは、送電コイルと３つの受電コイルとの間で非接触で電力を供給できる。 According to this third aspect, three power receiving coils can be arranged around one power transmitting coil. As a result, the non-contact type feeding antenna coil can supply electric power between the transmitting coil and the three power receiving coils in a non-contact manner.
　第４の態様としては、第３の態様において、前記送電コイルの奥行方向の長さ寸法と高さ方向の長さ寸法、および、前記受電コイルの奥行方向の長さ寸法と高さ方向の長さ寸法が同一であることを特徴としている。 As a fourth aspect, in the third aspect, the length dimension in the depth direction and the length dimension in the height direction of the power transmission coil, and the length dimension and the length in the height direction of the power receiving coil in the depth direction. It is characterized by having the same dimensions.
　この第４の態様によれば、送電コイルの鍔部から１つ目（例えば、上側）の受電コイルに向かう磁束の大きさと、送電コイルの鍔部から２つ目（例えば、左側）の受電コイルと３つ目（例えば、右側）の受電コイルに向かう磁束の大きさとが、ほぼ等しくなる。これにより、送電コイルと１つ目の受電コイルとの結合度と、送電コイルと２つ目の受電コイルとの結合度と、送電コイルと３つ目の受電コイルとの結合度とが、極端に異なることを防ぐことができる。即ち、３つの受電コイルに対する結合度の強弱の片寄りを最小限に抑えた状態で、送電コイルと３つの受電コイルとの間で非接触型給電を行うことができる。 According to this fourth aspect, the magnitude of the magnetic flux toward the first (for example, upper side) power receiving coil from the flange portion of the transmission coil and the second (for example, left side) power receiving coil from the flange portion of the transmission coil. And the magnitude of the magnetic flux toward the third (for example, the right side) power receiving coil are almost equal. As a result, the degree of coupling between the power transmission coil and the first power receiving coil, the degree of coupling between the power transmission coil and the second power receiving coil, and the degree of coupling between the power transmission coil and the third power receiving coil are extremely high. Can be prevented from being different. That is, non-contact power supply can be performed between the power transmission coil and the three power receiving coils in a state where the bias of the degree of coupling with respect to the three power receiving coils is minimized.
　第５の態様としては、第１ないし第４のいずれかの態様において、前記送電コイルは、巻き軸方向に対する前記巻線の間隔寸法が前記巻線の直径の９倍よりも長く、巻き軸方向の前記巻芯の長さ寸法の１／２よりも短くなることを特徴としている。 In a fifth aspect, in any one of the first to fourth aspects, the power transmission coil has a winding distance dimension longer than 9 times the diameter of the winding in the winding axis direction. It is characterized in that it is shorter than 1/2 of the length dimension of the winding core.
　この第５の態様によれば、送電コイルは、巻き軸方向に対する巻線の間隔をさらにあけてもよい（即ち、間隔寸法をさらに増やしてもよい）。この間隔寸法を調整することで、送電コイルと受電コイルとの結合度を向上させることができる。 According to this fifth aspect, the power transmission coil may further spacing the windings in the winding axis direction (ie, further increasing the spacing dimension). By adjusting this interval dimension, the degree of coupling between the power transmission coil and the power reception coil can be improved.
　第６の態様としては、第５の態様において、前記受電コイルは、巻き軸方向に対する前記巻線の間隔寸法が前記巻線の直径の９倍よりも長く、巻き軸方向の前記巻芯の長さ寸法の１／２よりも短くなることを特徴としている。 In the sixth aspect, in the fifth aspect, in the power receiving coil, the distance between the windings with respect to the winding axis direction is longer than 9 times the diameter of the windings, and the length of the winding core in the winding axis direction. It is characterized by being shorter than 1/2 of the dimension.
　この第６の態様によれば、受電コイルは、送電コイルと同様に、巻き軸方向に対する巻線の間隔をさらにあけてもよい（即ち、間隔寸法をさらに増やしてもよい）。この間隔寸法を調整することで、送電コイルと受電コイルとの結合度を向上させることができる。 According to this sixth aspect, the power receiving coil may be further spaced in the winding axis direction (that is, the spacing dimension may be further increased), similarly to the power transmission coil. By adjusting this interval dimension, the degree of coupling between the power transmission coil and the power reception coil can be improved.
　４，２１，３１　アンテナコイル（非接触型給電アンテナコイル）
　５　送電コイル
　６，１２　磁性体コア
　７，１３　巻芯
　８，１４　鍔部
　８Ａ，８Ｂ，８Ｃ，８Ｄ，１４Ａ，１４Ｂ，１４Ｃ，１４Ｄ　外周面
　９，１５　端子電極
　１０，１６，２３　巻線
　１１，２２　受電コイル
　Ａ　突出寸法
　Ｂ　幅寸法
　Ｄ　直径
　Ｇ　距離
　Ｌ　巻芯の長さ寸法
　Ｐ１１，Ｐ１２，Ｐ２１　間隔寸法
　Ｔ　高さ方向の長さ寸法
　Ｗ　奥行方向の長さ寸法 4,21,31 Antenna coil (non-contact type feeding antenna coil)
5 Transmission coil 6,12 Magnetic core 7,13 Winding core 8,14 Collar 8A, 8B, 8C, 8D, 14A, 14B, 14C, 14D Outer peripheral surface 9,15 Terminal electrode 10, 16, 23 Winding 11, 22 Power receiving coil A Protruding dimension B Width dimension D Diameter G Distance L Winding core length dimension P11, P12, P21 Spacing dimension T Height direction length dimension W Depth direction length dimension

Claims (6)

  1. 　送電コイルと受電コイルとを備え、前記送電コイルと前記受電コイルとの間で非接触で電力を供給する非接触型給電アンテナコイルにおいて、
    　前記送電コイルは、
    　柱状の巻芯と前記巻芯の両端に配設された一対の鍔部とを有する磁性体コアと、
    　前記一対の鍔部の実装面側に配設された一対の端子電極と、
    　前記巻芯に巻回され、両端部が前記一対の端子電極にそれぞれ接続される巻線と、を有し、
    　前記受電コイルは、
    　柱状の巻芯と前記巻芯の両端に配設された一対の鍔部とを有する磁性体コアと、
    　前記一対の鍔部の実装面側に配設された一対の端子電極と、
    　前記巻芯に巻回され、両端部が前記一対の端子電極にそれぞれ接続される巻線と、を有し、
    　前記送電コイルは、
    　巻き軸方向に対する前記巻線の間隔寸法が前記巻線の直径よりも長くなっており、
    　巻き軸方向に対する前記鍔部の長さを幅寸法とすると、前記一対の鍔部の幅寸法がそれぞれ巻き軸方向の前記巻芯の長さ寸法の１／４以下となっており、
    　前記鍔部が前記巻芯よりも前記端子電極側に突出し、前記鍔部の突出寸法は、前記巻線の直径よりも長く、前記巻線の直径の５倍よりも短くなっており、
    　前記送電コイルおよび前記受電コイルは、巻き軸方向と直交する奥行方向および高さ方向の長さ寸法を有し、前記送電コイルと前記受電コイルとの距離が、前記送電コイルの奥行方向の長さ寸法と高さ方向の長さ寸法、および、前記受電コイルの奥行方向の長さ寸法と高さ方向の長さ寸法のうち最長となる長さ寸法よりも短くなるように、配置されることを特徴とする非接触型給電アンテナコイル。     In a non-contact power feeding antenna coil that includes a power transmitting coil and a power receiving coil and supplies power in a non-contact manner between the power transmitting coil and the power receiving coil
    The power transmission coil
    A magnetic core having a columnar winding core and a pair of flanges arranged at both ends of the winding core,
    A pair of terminal electrodes arranged on the mounting surface side of the pair of collar portions,
    It has a winding that is wound around the winding core and both ends of which are connected to the pair of terminal electrodes.
    The power receiving coil is
    A magnetic core having a columnar winding core and a pair of flanges arranged at both ends of the winding core,
    A pair of terminal electrodes arranged on the mounting surface side of the pair of collar portions,
    It has a winding that is wound around the winding core and both ends of which are connected to the pair of terminal electrodes.
    The power transmission coil
    The distance between the windings in the winding axis direction is longer than the diameter of the windings.
    Assuming that the length of the flange portion with respect to the winding axis direction is the width dimension, the width dimension of the pair of collar portions is 1/4 or less of the length dimension of the winding core in the winding axis direction, respectively.
    The collar portion protrudes from the winding core toward the terminal electrode side, and the protruding dimension of the collar portion is longer than the diameter of the winding and shorter than 5 times the diameter of the winding.
    The power transmission coil and the power reception coil have length dimensions in the depth direction and the height direction orthogonal to the winding axis direction, and the distance between the power transmission coil and the power reception coil is the length in the depth direction of the power transmission coil. The dimensions and the length dimension in the height direction, and the length dimension in the depth direction and the length dimension in the height direction of the power receiving coil should be arranged so as to be shorter than the longest length dimension. Characterized non-contact type feeding antenna coil.
  2. 　前記受電コイルは、
    　巻き軸方向に対する前記巻線の間隔寸法が前記巻線の直径よりも長くなっており、
    　巻き軸方向に対する前記鍔部の長さを幅寸法とすると、前記一対の鍔部の幅寸法がそれぞれ巻き軸方向の前記巻芯の長さ寸法の１／４以下となっており、
    　前記鍔部が前記巻芯よりも前記端子電極側に突出し、前記鍔部の突出寸法は、前記巻線の直径よりも長く、前記巻線の直径の５倍よりも短くなっており、
    　前記送電コイルおよび前記受電コイルは、巻き軸方向と直交する奥行方向および高さ方向の長さ寸法を有し、前記送電コイルと前記受電コイルとの距離が、前記送電コイルの奥行方向の長さ寸法と高さ方向の長さ寸法、および、前記受電コイルの奥行方向の長さ寸法と高さ方向の長さ寸法のうち最長となる長さ寸法よりも短くなるように、配置されることを特徴とする請求項１に記載の非接触型給電アンテナコイル。     The power receiving coil is
    The distance between the windings in the winding axis direction is longer than the diameter of the windings.
    Assuming that the length of the flange portion with respect to the winding axis direction is the width dimension, the width dimension of the pair of collar portions is 1/4 or less of the length dimension of the winding core in the winding axis direction, respectively.
    The collar portion protrudes from the winding core toward the terminal electrode side, and the protruding dimension of the collar portion is longer than the diameter of the winding and shorter than 5 times the diameter of the winding.
    The power transmission coil and the power reception coil have length dimensions in the depth direction and the height direction orthogonal to the winding axis direction, and the distance between the power transmission coil and the power reception coil is the length in the depth direction of the power transmission coil. The dimensions and the length dimension in the height direction, and the length dimension in the depth direction and the length dimension in the height direction of the power receiving coil should be arranged so as to be shorter than the longest length dimension. The non-contact type feeding antenna coil according to claim 1.
  3. 　前記送電コイルおよび前記受電コイルの前記磁性体コアは、４つの外周面を有する四角形の筒状に形成された前記鍔部を有しており、
    　前記鍔部の１つの外周面には、前記端子電極が配設されており、
    　前記送電コイルの周囲には、前記端子電極が配設された外周面を除く３つの外周面とそれぞれ対面した状態で、３つの前記受電コイルが配置されることを特徴とする請求項１または２に記載の非接触型給電アンテナコイル。     The power transmission coil and the magnetic core of the power reception coil have the flange portion formed in a quadrangular tubular shape having four outer peripheral surfaces.
    The terminal electrode is arranged on one outer peripheral surface of the collar portion.
    Claim 1 or 2 is characterized in that three power receiving coils are arranged around the power transmission coil so as to face each of the three outer peripheral surfaces excluding the outer peripheral surface on which the terminal electrodes are arranged. The non-contact type feeding antenna coil described in.
  4. 　前記送電コイルの奥行方向の長さ寸法と高さ方向の長さ寸法、および、前記受電コイルの奥行方向の長さ寸法と高さ方向の長さ寸法が同一であることを特徴とする請求項３に記載の非接触型給電アンテナコイル。 The claim is characterized in that the length dimension in the depth direction and the length dimension in the height direction of the power transmission coil, and the length dimension in the depth direction and the length dimension in the height direction of the power receiving coil are the same. The non-contact type feeding antenna coil according to 3.
  5. 　前記送電コイルは、巻き軸方向に対する前記巻線の間隔寸法が前記巻線の直径の９倍よりも長く、巻き軸方向の前記巻芯の長さ寸法の１／２よりも短くなることを特徴とする請求項１ないし４のいずれかに記載の非接触型給電アンテナコイル。 The power transmission coil is characterized in that the distance between the windings in the winding axis direction is longer than 9 times the diameter of the winding and shorter than 1/2 of the length dimension of the winding core in the winding axis direction. The non-contact power feeding antenna coil according to any one of claims 1 to 4.
  6. 　前記受電コイルは、巻き軸方向に対する前記巻線の間隔寸法が前記巻線の直径の９倍よりも長く、巻き軸方向の前記巻芯の長さ寸法の１／２よりも短くなることを特徴とする請求項５に記載の非接触型給電アンテナコイル。 The power receiving coil is characterized in that the distance between the windings in the winding axis direction is longer than 9 times the diameter of the winding and shorter than 1/2 of the length dimension of the winding core in the winding axis direction. The non-contact type feeding antenna coil according to claim 5.
PCT/JP2020/030881 2019-10-11 2020-08-14 Contactless power feeding antenna coil WO2021070474A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-187818 2019-10-11
JP2019187818 2019-10-11

Publications (1)

Publication Number Publication Date
WO2021070474A1 true WO2021070474A1 (en) 2021-04-15

Family

ID=75437103

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/030881 WO2021070474A1 (en) 2019-10-11 2020-08-14 Contactless power feeding antenna coil

Country Status (1)

Country Link
WO (1) WO2021070474A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01173914U (en) * 1988-05-28 1989-12-11
JP2018074265A (en) * 2016-10-26 2018-05-10 Tdk株式会社 Antenna device
JP2019068726A (en) * 2017-09-29 2019-04-25 アップル インコーポレイテッドＡｐｐｌｅ Ｉｎｃ． Inductive interconnection system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01173914U (en) * 1988-05-28 1989-12-11
JP2018074265A (en) * 2016-10-26 2018-05-10 Tdk株式会社 Antenna device
JP2019068726A (en) * 2017-09-29 2019-04-25 アップル インコーポレイテッドＡｐｐｌｅ Ｉｎｃ． Inductive interconnection system

Similar Documents

Publication Publication Date Title
US10574090B2 (en) Mobile terminal including wireless charging coil and magnetic sheet having inwardly receding portion
JP5316735B1 (en) Antenna device and communication terminal device
US9831685B2 (en) Wireless power transmitter
US10714251B2 (en) Precision transformer for antenna elements
US20180166918A1 (en) Mobile terminal
JP4894960B2 (en) Electronics
GB2469209A (en) Antenna including a coil having two offset and non-overlapping portions
JP2007194282A (en) Coil component
WO2013118482A1 (en) Power transmission coil
JP6179160B2 (en) Wireless power transmission equipment
JP2019041273A (en) Coil antenna and electronic device
US10224146B2 (en) Inductive coupling system and communication system
WO2021070474A1 (en) Contactless power feeding antenna coil
KR101870877B1 (en) Antenna structure for mobile apparatus
JP2009206974A (en) Magnetic body antenna, and antenna apparatus
KR102224621B1 (en) Wireless Power Transfer Apparatus with Receiver-Oriented Coupler Structure
JP2019208276A (en) Antenna device, antenna coil, and electronic apparatus
WO2018070128A1 (en) Antenna device, communication terminal apparatus and wristwatch with crown
US10396463B2 (en) Antenna device
JP2008060899A (en) Antenna device and electronic apparatus using it
WO2020158638A1 (en) Antenna device and electronic apparatus
WO2021085464A1 (en) Electronic device and antenna device
CN109792165B (en) Antenna core for wireless power transmission and wireless power transmission module including the same
JP6642699B2 (en) Coil antenna, power supply device, power receiving device, and wireless power supply system
JP6638254B2 (en) Antenna equipment and electronic equipment

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20874735

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20874735

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP