Antenna device and electronic apparatus
First Claim
Patent Images
1. An antenna device comprising:
- an antenna coil;
a magnetic core; and
a metal member,the antenna coil being wound in a loop shape or a spiral shape along the magnetic core such that a winding center section thereof is a coil opening section,the magnetic core passing through the coil opening section,the antenna coil being positioned opposite to a communication partner side with respect to the metal member,the metal member having an opening whose inner edge is closed,the opening is surrounded by the metal member, andpart or all of a portion of the antenna coil being exposed through the opening in the metal member, the portion being nearer to the metal member than the magnetic core is near to the metal member.
1 Assignment
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Accused Products
Abstract
An antenna device includes an antenna coil, a magnetic core, and a metal member. The antenna coil is mounted on a flexible base. The antenna coil is wound in a loop shape or a spiral shape such that its winding center section is a coil opening section. The magnetic core passes through a slit opening section in the flexible base. The metal member has a rectangular opening. The antenna coil is exposed through the opening in the metal member. A front-side coil conductor is nearer the opening than the magnetic core, and thus a magnetic flux links the front-side coil conductor.
10 Citations
11 Claims
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1. An antenna device comprising:
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an antenna coil; a magnetic core; and a metal member, the antenna coil being wound in a loop shape or a spiral shape along the magnetic core such that a winding center section thereof is a coil opening section, the magnetic core passing through the coil opening section, the antenna coil being positioned opposite to a communication partner side with respect to the metal member, the metal member having an opening whose inner edge is closed, the opening is surrounded by the metal member, and part or all of a portion of the antenna coil being exposed through the opening in the metal member, the portion being nearer to the metal member than the magnetic core is near to the metal member. - View Dependent Claims (3, 6, 7, 8, 9)
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2. An antenna device comprising:
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an antenna coil; a magnetic core; and a metal member, the antenna coil being wound in a loop shape or a spiral shape along the magnetic core such that a winding center section thereof is a coil opening section, the magnetic core passing through the coil opening section, the antenna coil being positioned opposite to a communication partner side with respect to the metal member, the metal member having an opening being surrounded by the metal member, and part or all of a portion of the antenna coil being exposed through the opening in the metal member, the portion being nearer to the metal member than the magnetic core is near to the metal member, when seen in a direction perpendicular to the opening in the metal member, the winding center section of the antenna coil is displaced from a center of the opening in the metal member in a direction in which the portion of the antenna coil approaches the center of the opening. - View Dependent Claims (4)
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5. An antenna device comprising:
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an antenna coil; a magnetic core; and a metal member, the antenna coil being wound in a loop shape or a spiral shape along the magnetic core such that a winding center section thereof is a coil opening section, the magnetic core passing through the coil opening section, the antenna coil being positioned opposite to a communication partner side with respect to the metal member, the metal member having an opening being surrounded by the metal member, and part or all of a portion of the antenna coil being exposed through the opening in the metal member, the portion being nearer to the metal member than the magnetic core is near to the metal member, wherein a portion of the antenna coil, the portion being parallel to a direction through which the magnetic core passes, is positioned outside the opening when seen in a direction perpendicular to the opening in the metal member.
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10. An antenna device comprising:
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an antenna coil; a magnetic core; a metal member; and an excitation coil, the antenna coil being wound in a loop shape or a spiral shape along the magnetic core such that a winding center section thereof is a coil opening section, the magnetic core passing through the coil opening section, the antenna coil being positioned opposite to a communication partner side with respect to the metal member, the metal member having an opening being surrounded by the metal member, part or all of a portion of the antenna coil being exposed through the opening in the metal member, the portion being nearer to the metal member than the magnetic core is near to the metal member, and the excitation coil being different from an antenna coil in a reader-writer electromagnetic-field coupled to the antenna coil of the antenna device, wherein the antenna coil constitutes at least part of a resonant circuit.
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11. An electronic apparatus comprising:
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an antenna device; and a communication apparatus, wherein the antenna device comprising; an antenna coil; a magnetic core; and a metal member, the antenna coil being would in a loop shape or a spiral shape along the magnetic core such that a winding center section thereof is a coil opening section, the magnetic core passing through the coil opening section, the antenna coil being positioned opposite to a communication partner side with respect to the metal member, the metal member having an opening being surrounded by the metal member, and part or all of a portion of the antenna coil being exposed through the opening in the metal member, the portion being nearer to the metal member than the magnetic core is near to the metal member, wherein the metal member is part of a casing.
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Specification