Coil antenna and non-contact information medium
AssigneeNHK Spring Co., Ltd.
InventorsKiyotaka Fukushima, Kenji Yamamotoya, Masayuki Miura, Kenichiro Tami
Life of this patent
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Abstract
Without using a component such as a chip coil, a winding pattern is formed with a wire with which a main wiring pattern is formed. This enables to deal with the flexibility by realizing a thin product using a coil antenna. Further, the wiring pattern is designed such that the winding pattern is provided and distributed to the main wiring pattern forming a loop, and is formed with the wire so as to have a wound shape small enough compared with the main wiring pattern. In this way, the ratio of the self-inductance to the mutual inductance is appropriately made further large, so that the mutual inductance is made comparatively small.
Claims19
A non-contact information medium comprising:
- a base;
- a coil antenna formed with a wire arranged in a loop shape on the base and forming a resonant circuit with a capacitor electrically connected thereto, the coil antenna comprising a winding pattern that is distributed to a portion of or an entire main wiring pattern forming the loop, and that is formed with the wire to have a wound shape smaller than the main wiring pattern;
- and
- an IC circuit disposed on the base and connected to the resonant circuit to transmit and receive information to and from a reader/writer.
A coil antenna, formed with a wire arranged in a loop shape and forming a resonant circuit with a capacitor electrically connected thereto, the coil antenna comprising:
- a winding pattern that is distributed to a portion of or an entire main wiring pattern forming the loop, and that is formed with the wire to have a wound shape smaller than the main wiring pattern,
- wherein the wound shape of the winding pattern is a spiral shape,
- the winding pattern is formed on same plane as the main wiring pattern so as to be distributed to a plurality of locations in the main wiring pattern, and
- the winding pattern is formed continuously along the main wiring pattern so as to have the spiral shape having a turning direction opposite a turning direction of an adjoining spiral shape.
A coil antenna, formed with a wire arranged in a loop shape and forming a resonant circuit with a capacitor electrically connected thereto, the coil antenna comprising:
- a winding pattern that is distributed to a portion of or an entire main wiring pattern forming the loop, and that is formed with the wire to have a wound shape smaller than the main wiring pattern,
- wherein the wound shape of the winding pattern is a spiral shape, and
- the winding pattern is formed on a plane orthogonal to a plane on which the main wiring pattern is formed.
A coil antenna, formed with a wire arranged in a loop shape and forming a resonant circuit with a capacitor electrically connected thereto, the coil antenna comprising:
- a winding pattern that is distributed to a portion of or an entire main wiring pattern forming the loop, and that is formed with the wire to have a wound shape smaller than the main wiring pattern,
- wherein the wound shape of the winding pattern is a zigzag shape formed such that a winding shape thereof is distributed along at least a portion of the main wiring pattern and spread out on same plane as the main wiring pattern.
A coil antenna, formed with a wire arranged in a loop shape and forming a resonant circuit with a capacitor electrically connected thereto, the coil antenna comprising:
- a winding pattern that is distributed to a portion of or an entire main wiring pattern forming the loop, and that is formed with the wire to have a wound shape smaller than the main wiring pattern;
- and
- a shielding object provided to overlap on one surface or both surfaces near an area where the winding pattern is formed.
A coil antenna, formed with a wire arranged in a loop shape and forming a resonant circuit with a capacitor electrically connected thereto, the coil antenna comprising:
- a winding pattern that is formed, in a portion of a main wiring pattern forming the loop, with the wire to have a wound shape smaller than the main wiring pattern;
- and
- a shielding object provided to overlap on one surface or both surfaces near an area where the winding pattern is formed.
Dependencies are inferred from the claim text.