Antenna for reader/writer and reader/writer having the antenna
First Claim
Patent Images
1. A reader/writer antenna which is used with a Radio Frequency Identification (RFID) system for non-contacting data communication comprising:
- a soft magnetic member configured to be disposed on a surface;
an antenna coil which is formed by at least one turn and disposed on the soft magnetic member; and
a conductive member disposed on said soft magnetic member on an opposite side of a placement of the antenna coil,wherein an object with said reader/writer antenna affixed thereon is a metal member or a member which contains the metal member.
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Accused Products
Abstract
A soft magnetic member which is formed by a composite of an organic object to satisfy a predetermined relationship with an antenna area, a circumference length, and a magnetic transmission ratio and a conductive member are provided between an antenna coil which is formed by at least one loop and a metal surface of the conductive member such as a metal casing. The magnetic flux which invades into the conductive object is blocked by the soft magnetic member and the conductive member so as to restrict the influence thereof.
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Citations
16 Claims
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1. A reader/writer antenna which is used with a Radio Frequency Identification (RFID) system for non-contacting data communication comprising:
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a soft magnetic member configured to be disposed on a surface; an antenna coil which is formed by at least one turn and disposed on the soft magnetic member; and a conductive member disposed on said soft magnetic member on an opposite side of a placement of the antenna coil, wherein an object with said reader/writer antenna affixed thereon is a metal member or a member which contains the metal member. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A reader/writer antenna which is used with a Radio Frequency Identification (RFID) system for non-contacting data communication comprising:
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a soft magnetic member configured to be disposed on a surface; and an antenna coil which is formed by at least one turn and is disposed on the soft magnetic member, wherein a thickness t for the soft magnetic member or a magnetic core for forming a plate satisfies a relationship S/L>
t>
S/(L/μ
) under condition that S indicates an area for the antenna coil, L indicates a circumferential length of the antenna coil, and μ
indicates a magnetic transmittance ratio of the soft magnetic member or the magnetic core.
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8. A reader/writer antenna which is used with a Radio Frequency Identification (RFID) system for non-contacting data communication comprising:
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a soft magnetic member configured to be disposed on a surface; and an antenna coil which is formed by at least one turn and disposed on the soft magnetic member, wherein the soft magnetic member is a compound of either a metal powder, a flake or a ferrite powder, which are formed by flattening a metal powder, wherein the metal powder is one of a carbonyl iron powder, a reduced iron powder, an atomized powder, or an amorphous powder, and the reader/writer antenna is configured to be disposed so as to contact a casing which is formed by a non-magnetic member which has an initial resistance of approximately 10×
10−
8 Ω
m or lower.
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9. A reader/writer antenna which is used with a Radio Frequency Identification (RFID) system for non-contacting data communication comprising:
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a soft magnetic member configured to be disposed on a surface; and an antenna coil which is formed by at least one turn and disposed on the soft magnetic member, wherein the soft magnetic member is a compound of either a metal powder, a flake or a ferrite powder, which are formed by flattening a metal powder, wherein the metal powder or the flake is made by flattening a water-atomized iron base alloy or an iron base alloy powder mechanically, and the reader/writer antenna is configured to be disposed so as to contact a casing which is formed by a non-magnetic member which has an initial resistance of approximately 10×
10−
8 Ω
m or lower. - View Dependent Claims (10)
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11. A reader/writer antenna which is used with a Radio Frequency Identification (RFID) system for non-contacting data communication comprising:
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a soft magentic member configured to be disposed on a surface; and an antenna coil which is formed by at least one turn and disposed on the soft magnetic member, wherein the soft magnetic member is a compound of either a metal powder, a flake or a ferrite powder, which are formed by flattening a metal powder, wherein the metal powder or the flake is made by flattening a water-atomized iron base alloy or an iron base alloy powder mechanically, and the iron base alloy contains at least approximately 1 w % of aluminum or lower, approximately 3 w % of nickel or copper or lower, approximately 5 w % of chromium or lower, approximately 10 w % of cobalt or lower in addition to approximately 6 w % to 15 w % of silicon.
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12. A reader/writer antenna which is used with a Radio Frequency Identification (RFID) system for non-contacting data communication comprising:
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a soft magnetic member configured to be disposed on a surface; and an antenna coil which is formed by at least one turn and disposed on the soft magnetic member, wherein the soft magnetic member is a compound of either a metal powder, a flake or a ferrite powder, which are formed by flattening a metal powder, and wherein the compound is an injection molded member, a compressed molded member, a rolled stripped member, or a member to which a painting member is applied.
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13. A reader/writer antenna which is used with a Radio Frequency Identification (RFID) system for non-contacting data communication comprising:
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a soft magnetic member configured to be disposed on a surface of an object; and an antenna coil which is formed by at least one turn and is disposed on the soft magnetic member, wherein a non-magnetic conductive member of which resistivity is approximately 10×
10−
8Ω
m or lower or a conductive member of which resistivity is approximately 3×
10−
8Ω
m is configured to be disposed between the soft magnetic member and the object.
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14. A reader/writer antenna which is used with a Radio Frequency Identification (RFID) system for non-contacting data communication comprising:
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a soft magnetic member configured to be disposed on a surface of an object; and an antenna coil which is formed by at least one turn and is disposed on the soft magnetic member, wherein a non-magnetic conductive member has a 0.015 Ω
resistance or lower with 1 cm length, 1 cm width, and is configured to be disposed between the soft maghetic member and the objuect.
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15. A reader/writer antenna which is used with a Radio Frequency Identification (RFID) system for non-contacting data communication comprising:
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a soft magnetic member configured to be disposed on a surface; an antenna coil which is formed by at least one turn and disposed on the soft magnetic member; and conductive member disposed on said soft magnetic member on an opposite side of a placement of the antenna coil, wherein the reader/writer antenna is configured to be disposed so as to contact a casing which is formed by a non-magnetic member which has an initial resistance of approximately 10×
10−
8Ω
m or lower.
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16. A reader/writer antenna which is used with a Radio Frequency Identification (RFID) system for non-contacting data communication comprising:
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a soft magnetic member configured to be disposed on a surface; and an antenna coil which is formed by at least one turn and disposed on the soft magnetic member, wherein the antenna coil is wound in a spiral manner, and said antenna is configured to be disposed so as to contact a casing made of a conductive member which has 0.015 Ω
or lower resistance.
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Specification