Antenna coil comprising plurality of coil portions
First Claim
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1. An antenna coil, comprising:
- a main coil portion formed by winding a length of conductor wire around a first reference axis; and
an auxiliary coil portion formed by winding a length of conductor wire around a second reference axis different from the first reference axis, the auxiliary coil portion having a smaller diameter than a diameter of the main coil portion, the auxiliary coil portion being disposed such that a magnetic flux of the main coil portion is deflected in a direction along the second reference axis;
wherein the main coil portion and the auxiliary coil portion are connected in series or in parallel to form a closed circuit, and wherein when current flows simultaneously in the main coil portion and the auxiliary coil portion, the magnetic flux of the main coil portion has directivity such that the magnetic flux of the main coil portion spreads on a side where the auxiliary coil portion is absent relative to a side where the auxiliary coil portion is present and the magnetic flux of the main coil portion bends and returns via the auxiliary coil portion as a bypassing circuit.
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Abstract
Provided is an antenna coil capable of forming a magnetic field in a desired direction in an efficient manner, while suppressing leakage of magnetic flux into a space other than the space in which the magnetic field is formed. The antenna coil includes a main coil portion formed by winding a length of conductor wire around a first reference axis and an auxiliary coil portion formed by winding the conductor wire around a second reference axis. The second reference axis is set to intersect the magnetic flux of the main coil portion at an axial end of the auxiliary coil portion. The main coil portion and the auxiliary coil portion are connected to together form a closed circuit.
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Citations
20 Claims
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1. An antenna coil, comprising:
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a main coil portion formed by winding a length of conductor wire around a first reference axis; and an auxiliary coil portion formed by winding a length of conductor wire around a second reference axis different from the first reference axis, the auxiliary coil portion having a smaller diameter than a diameter of the main coil portion, the auxiliary coil portion being disposed such that a magnetic flux of the main coil portion is deflected in a direction along the second reference axis; wherein the main coil portion and the auxiliary coil portion are connected in series or in parallel to form a closed circuit, and wherein when current flows simultaneously in the main coil portion and the auxiliary coil portion, the magnetic flux of the main coil portion has directivity such that the magnetic flux of the main coil portion spreads on a side where the auxiliary coil portion is absent relative to a side where the auxiliary coil portion is present and the magnetic flux of the main coil portion bends and returns via the auxiliary coil portion as a bypassing circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An antenna coil which is at least one of a power supplying side coil and a power receiving side coil of a magnetic-field resonance power supply apparatus for effecting wireless power supply between a power supplying circuit having the power supplying side coil and a power receiving circuit having the power receiving side coil, the antenna coil comprising:
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a main coil portion formed by winding a length of conductor wire around a first reference axis; and an auxiliary coil portion formed by winding a length of conductor wire around a second reference axis different from the first reference axis, the auxiliary coil portion having a smaller diameter than a diameter of the main coil portion; an opposing side axial end face of the antenna coil that is an end face perpendicular to the first reference axis at a first end of the main coil portion on a side where the power supplying side coil and the power receiving side coil are opposed to each other; and a back face side axial end face that is an end face perpendicular to the first reference axis at a second end of the main coil portion and is opposite the opposing side axial end face; wherein the main coil portion and the auxiliary coil portion are connected in series or in parallel to form a closed circuit, the auxiliary coil portion is disposed along the back face side axial end face with a depression angle of within 45 degrees for progressive inclination from the back face side axial end face toward the opposing side axial end face as the auxiliary coil portion extends toward a radial outer side of the main coil portion, and a magnetic flux of the main coil portion is deflected in a direction along the second reference axis, and wherein when current flows simultaneously in the main coil portion and the auxiliary coil portion, the magnetic flux of the main coil portion has directivity in a direction along the first reference axis such that the magnetic flux of the main coil portion spreads on a side where the auxiliary coil portion is absent relative to a side where the auxiliary coil portion is present and the magnetic flux of the main coil portion bends and returns via the auxiliary coil portion as a bypassing circuit. - View Dependent Claims (15, 16, 17, 18)
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19. An antenna coil which is at least one of a power supplying side coil and a power receiving side coil of a magnetic-field resonance power supply apparatus for effecting wireless power supply between a power supplying circuit having the power supplying side coil and a power receiving circuit having the power receiving side coil, the antenna coil comprising:
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a main coil portion formed by winding a length of conductor wire around a first reference axis; and an auxiliary coil portion formed by winding a length of conductor wire around a second reference axis different from the first reference axis, the auxiliary coil portion having a smaller diameter than a diameter of the main coil portion, the second reference axis being substantially in parallel with the first reference axis, wherein the main coil portion and the auxiliary coil portion are connected in series or in parallel to form a closed circuit, the auxiliary coil portion is inscribed in the main coil portion on a side where the power supplying side coil and the power receiving side coil are opposed to each other, or circumscribed on the main coil portion on a side where the power supplying side coil and the power receiving side coil are opposed to each other, and is disposed in such a manner as to have a portion thereof overlapped with the main coil portion as seen along a first direction perpendicular to the first reference axis, and a magnetic flux of the main coil portion is deflected in a direction along the second reference axis, and wherein when current flows simultaneously in the main coil portion and the auxiliary coil portion, the magnetic flux of the main coil portion has directivity in a second direction perpendicular to the first reference axis such that the magnetic flux of the main coil portion spreads on a side where the auxiliary coil portion is absent relative to a side where the auxiliary coil portion is present and the magnetic flux of the main coil portion bends and returns via the auxiliary coil portion as a bypassing circuit. - View Dependent Claims (20)
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Specification