Antenna coil and rfid-use tag using it, transponder-use antenna
First Claim
1. An antenna coil comprising:
- an air-core coil formed by a coil member wound on a plane; and
a magnetic core member inserted in the air-core coil to be approximately parallel to the plane in the air-core coil, wherein the magnetic core member is formed by a composite member of a soft magnetic metal member, a powder of an amorphous member or a powder of a ferrite member or a flake member and a plastic member or a rubber.
1 Assignment
0 Petitions
Accused Products
Abstract
An antenna coil includes an air-core coil wound helically in a plane and a plate magnetic core member inserted in the air-core coil to be approximately parallel with a plane of the air-core coil. The magnetic core member is formed by a soft magnetic metal, an amorphous or ferrite, or a composite member of a powder, flake and plastic, or rubber. The magnetic core member is formed by performing an injection molding operation or a compressing molding operation of the composite member. Alternatively, the magnetic core member is a magnetic coating formed by applying and drying the composite member. A non-magnetic conductive plate that has a conductivity is layered on a surface of the air-core coil through which the magnetic core member is inserted. The conductive plate is made of a copper, a copper alloy, an aluminum or an aluminum alloy having 0.01 to 2 mm thickness. The antenna coil is operated by relatively high frequency while it is rigid relatively.
146 Citations
35 Claims
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1. An antenna coil comprising:
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an air-core coil formed by a coil member wound on a plane; and
a magnetic core member inserted in the air-core coil to be approximately parallel to the plane in the air-core coil, wherein the magnetic core member is formed by a composite member of a soft magnetic metal member, a powder of an amorphous member or a powder of a ferrite member or a flake member and a plastic member or a rubber. - View Dependent Claims (2, 3)
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4. An antenna coil comprising:
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an air-core coil formed by a coil member wound on a plane; and
a magnetic core member inserted in the air-core coil to be approximately parallel to the plane in the air-core coil, wherein a non-magnetic conductive plate is layered on a surface of the air-core coil through which the magnetic core member is inserted. - View Dependent Claims (5, 6)
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7. An antenna coil comprising:
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an insulating member which is formed by an electrically insulating film or an electrically insulating sheet;
a continuous conductive member including forwarding sections and returning sections formed alternatively so as to wind on a surface of the insulating member;
a first magnetic core member bonded on a back surface of the insulating member to cover the forwarding section from the back surface of the insulating member without overlapping the forwarding section. - View Dependent Claims (8, 9, 10, 11, 12, 13, 35)
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14. A tag antenna coil comprising:
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a coil main body which is formed by a conductive coil member wound in a plane; and
a magnetic core member made of a sheet member or a plate member bonded on a surface of the coil main body such that an end of the magnetic core member is disposed in a central section which is surrounded by the coil main body and another end of the magnetic core member is disposed at an outside of the coil main body to cross a part of the coil main body. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A transponder antenna which is connected to an IC chip or a condenser electrically to be attached to an article comprising:
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a conductive plate member having a back surface attached to the article;
a coil main body wound helically on a surface of the conductive member via an insulating member and fixed thereon such that a turning number and a coil diameter are adjusted to realize a predetermined characteristic value under a wound condition. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 30, 31, 32, 33, 34)
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29. A transponder antenna attached to an article connected to an IC chip or a condenser electrically comprising:
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a soft magnetic member formed in a sheet manner having a back surface attached on the article; and
a coil main body wound helically on a surface of the soft magnetic member to be fixed thereon such that a turning number and a coil diameter are adjusted to realize a predetermined characteristic value under a wound condition.
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Specification