WO2009139148A1 - 複合磁性体アンテナ及びrfタグ、該複合磁性体アンテナ又はrfタグを設置した金属部品、金属工具 - Google Patents
複合磁性体アンテナ及びrfタグ、該複合磁性体アンテナ又はrfタグを設置した金属部品、金属工具 Download PDFInfo
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- WO2009139148A1 WO2009139148A1 PCT/JP2009/002060 JP2009002060W WO2009139148A1 WO 2009139148 A1 WO2009139148 A1 WO 2009139148A1 JP 2009002060 W JP2009002060 W JP 2009002060W WO 2009139148 A1 WO2009139148 A1 WO 2009139148A1
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- magnetic
- tag
- magnetic antenna
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- metal
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07773—Antenna details
- G06K19/07777—Antenna details the antenna being of the inductive type
- G06K19/07779—Antenna details the antenna being of the inductive type the inductive antenna being a coil
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
- G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
- G06K19/07771—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card the record carrier comprising means for minimising adverse effects on the data communication capability of the record carrier, e.g. minimising Eddy currents induced in a proximate metal or otherwise electromagnetically interfering object
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
- H01Q7/08—Ferrite rod or like elongated core
Definitions
- the present invention relates to a magnetic antenna for communicating information using a magnetic field component and an RF tag using the magnetic antenna, and the magnetic antenna has a metal object or a conductive portion around one end in the coil longitudinal direction. By being formed so as to be surrounded by an object, it is possible to use it with metal embedding, which cannot be used with a conventional RF tag, while maintaining sufficient communication sensitivity.
- An antenna that transmits and receives electromagnetic waves using a magnetic material is a coil formed by winding a conducting wire around a core (magnetic material) and penetrating the magnetic material from the outside through the magnetic material.
- RF Tag When the frequency becomes higher, in the RF tag, a planar loop coil whose plane is parallel to the object to be identified without using a magnetic material is used as an antenna, and when the frequency becomes higher (UHF band or microwave band), RF Electric field antennas (dipole antennas and dielectric antennas) that detect electric field components are widely used rather than detecting magnetic field components including tags.
- UHF band or microwave band RF Electric field antennas (dipole antennas and dielectric antennas) that detect electric field components are widely used rather than detecting magnetic field components including tags.
- Such a flat loop antenna and electric field antenna have a problem that when a metal object approaches, an image (mirror effect) is formed on the metal object and has an opposite phase to the antenna, so that the sensitivity of the antenna is lost.
- a magnetic antenna for transmitting and receiving a magnetic field component in which an electrode material is formed in a coil shape on a core centering on a magnetic layer, and an insulating layer is formed on one or both outer surfaces on which the coiled electrode material is formed
- a magnetic antenna in which a conductive layer is provided on one or both outer surfaces of the insulating layer is known (Patent Document 1).
- the magnetic antenna maintains its characteristics as an antenna even when in contact with a metal object.
- tags or antennas that specify the installation state of the tag or magnetic antenna (Patent Documents 2 to 4).
- Patent Document 2 is intended to be installed on the surface of an object, and is not considered to be used by being embedded in the object.
- an object of the present invention is to obtain a composite RF tag or a composite magnetic antenna composed of a magnetic antenna that can maintain characteristics even in a small state embedded in a small-diameter hole formed in a metal.
- the present invention is a composite RF tag for transmitting and receiving information using an electromagnetic induction method
- the composite RF tag includes a magnetic antenna mounted with an IC and an insulator formed around the magnetic antenna.
- the magnetic antenna is formed such that the electrode material is coiled around a core made of a magnetic material, and the insulator is a periphery of the magnetic antenna except for one end in the coil longitudinal direction.
- the composite RF tag is characterized in that the metal or conductive material is formed outside the insulator (Invention 1).
- the present invention is a composite RF tag for transmitting and receiving information using an electromagnetic induction method
- the composite RF tag includes a magnetic antenna on which an IC is mounted and an insulator formed around the magnetic antenna.
- the magnetic antenna is formed such that the electrode material is coiled around a core made of a magnetic material and a non-magnetic material, and the insulator is a longitudinal direction of the coil of the magnetic antenna.
- the metal object or the conductor is a composite RF tag formed on the outer side of the insulator (invention 2).
- the inner diameter of the metal object or conductor is 1.0 times the longest length of the cross section of the magnetic antenna. This is the composite RF tag as described above (Invention 3).
- the present invention provides the composite RF tag according to the first aspect, wherein the length of the metal or conductive material in the depth direction is 1.0 or more times the length in the longitudinal direction of the magnetic antenna. It is a tag (Invention 4).
- the present invention also relates to a composite magnetic antenna for transmitting and receiving information using an electromagnetic induction method.
- the composite magnetic antenna is composed of a magnetic antenna, an insulator formed around the magnetic antenna, and a metal object.
- the magnetic antenna is formed such that the electrode material is coiled around a magnetic material or a core made of a magnetic material and a non-magnetic material, and the insulator is a coil length of the magnetic antenna. It is a magnetic antenna that is formed around the direction except one end, and the metal or conductive material is formed outside the insulator (Invention 5).
- the present invention is a metal part provided with the composite RF tag according to any one of the first to fourth aspects of the present invention or the composite magnetic antenna according to the fifth aspect of the present invention (Invention 6).
- present invention is a metal tool in which the composite RF tag according to any one of the present inventions 1 to 4 or the composite magnetic antenna according to the present invention 5 is installed (present invention 7).
- the composite RF tag and composite magnetic antenna according to the present invention do not vary in communication sensitivity even when embedded in a small space hole of a metal object, and are suitable for use as an RFID of 13.56 MHz.
- the composite RF tag and the composite magnetic antenna according to the present invention are small in size and can ignore external influences, particularly the influence of external metals or conductors. Therefore, portable devices, containers, metal parts, substrates, metal tools, It can be used in a state in which it is embedded in various uses such as a mold, a printing plate or a printing roll, a vehicle such as a bicycle or an automobile, a metal jig, a marker such as a bolt or a hammer.
- an insulator is formed around one end of the magnetic antenna (RF tag) in which the IC is mounted except for one end in the coil longitudinal direction (open surface of the magnetic flux). It is formed outside the insulator.
- the magnetic antenna is formed such that the electrode material is coiled around a core made of a magnetic material or a magnetic material and a non-magnetic material, and an IC is mounted on the magnetic antenna to form an RF tag.
- the composite RF tag according to the present invention is arranged around the magnetic antenna 17 so as to surround one end in the coil longitudinal direction with a metal or conductive material 30, and further, the magnetic antenna and the metal object Alternatively, the insulating material 20 is filled between the conductive materials.
- the cross-sectional shape of the metal or conductive material is not particularly limited, and may be any shape such as a circular shape, an elliptical shape, a triangular shape, a quadrangular shape, a pentagonal shape, a hexagonal shape, or a star shape. Also good. In view of industrial productivity, a circular shape is preferable.
- the cross section of the magnetic antenna in the longitudinal direction of the coil has no bottom as shown in FIGS. 1B to 1D other than the cylindrical shape shown in FIG. Or a conical shape and a hemisphere at the bottom.
- the metal or conductive material need not be formed on the entire outer surface of the insulator, and may be formed on the entire outer surface of the insulator or in a state where a gap is left.
- two or more curved metal objects or conductors are formed with a gap so that the metal objects or conductors do not contact each other
- two or more plate-shaped metal objects or conductors are A state where it is formed on an insulator so that it does not come into contact with the object or conductor, a state where a gap is partially opened, a state where a metal object or conductor is formed in a C shape when the insulator has a circular cross section
- the cross section of the insulator is a polygonal shape such as a quadrangle, it may be in any state such as a state where a metal or conductive material is formed at each corner.
- a metal or conductive material may be formed on the entire surface only at at least one end of the composite RF tag.
- the inner diameter (c of FIG. 2) of the metal object or conductor is the ratio (c / a) to the longest length (a of FIG. 2) of the cross section of the magnetic antenna. )
- the length (d in FIG. 2) of the metal or conductive material is 1.0 times or more in the ratio (d / b) to the length in the longitudinal direction of the core (b in FIG. 2). It is preferable.
- d / b is less than 1.0, it is difficult to have sufficient sensitivity. More preferably, it is 1.2 times or more.
- the thickness of the metal or conductive material is not particularly limited, but is preferably about 0.5 to 2.0 mm.
- the metal object in the present invention is not particularly limited, and examples thereof include stainless steel, iron, aluminum, copper, brass and the like, which are general metal pipe materials.
- a general conductive material such as carbon, a conductive polymer material such as polyacetylene, or a composite thereof can be used.
- resin glass ceramics, nonmagnetic ferrite or the like may be used.
- resin what has heat resistance, such as a polyimide, an epoxy resin, a phenol resin, is preferable.
- glass ceramic borosilicate glass, zinc glass, lead glass or the like is preferable.
- nonmagnetic ferrite Zn-based ferrite and the like are preferable.
- an IC is mounted on a magnetic antenna and used as an RF tag.
- the wiring connected to the coil lead terminal of the magnetic antenna may be extended to the outside of the composite magnetic antenna and connected to the IC chip installed outside the composite magnetic antenna.
- FIGS. 1-10 Schematic diagrams of the magnetic antenna according to the present invention are shown in FIGS.
- the magnetic antenna shown in FIG. 3 is formed so that the electrode material is coiled (wound) around the magnetic layer (core), and is insulated on one or both outer surfaces on which the coiled electrode material is formed.
- the basic structure is that a layer is formed.
- the magnetic antenna shown in FIG. 3 forms a magnetic layer 5 in which a single layer or a plurality of layers formed by mixing a mixture of magnetic powder and a binder into a sheet shape is formed.
- Through hole 1 is opened in layer 5.
- Electrode material is poured into each of the through holes 1, and electrode layers 2 are formed on both surfaces perpendicular to the through holes 1 so as to be connected to the through holes 1 so as to form a coil (winding shape).
- the coil is formed so that the layer 5 has a square or rectangular core. At this time, both ends of the magnetic layer 5 forming the coil 4 are open on the magnetic circuit.
- insulating layers 6 are formed on the upper and lower surfaces of the coil 4 on which the electrode layer is formed.
- the obtained sheet is cut by the through-hole 1 and the coil open end face 3 so as to have a desired shape and fired integrally, or is cut by the through-hole 1 and the coil open end face 3 after the integral firing. (LTCC technology).
- the magnetic antenna shown in FIG. 4 is formed so that the electrode material has a coil shape (winding shape) around the magnetic layer (core), and is insulated on one or both outer surfaces on which the coiled electrode material is formed.
- the basic structure is that a conductive layer is formed on one or both outer surfaces of the insulator.
- the magnetic antenna shown in FIG. 4 forms a magnetic layer 5 in which a single layer or a plurality of layers made of a mixture of magnetic powder mixed with a binder is formed into a sheet, and the magnetic antenna is formed.
- Through hole 1 is opened in layer 5.
- Electrode material is poured into each of the through holes 1, and electrode layers 2 are formed on both surfaces perpendicular to the through holes 1 so as to be connected to the through holes 1 so as to form a coil (winding shape).
- the coil is formed so that the layer 5 has a square or rectangular core. At this time, both ends of the magnetic layer 5 forming the coil 4 are open on the magnetic circuit.
- insulating layers 6 are formed on the upper and lower surfaces of the coil 4 on which the electrode layer is formed.
- a conductive layer 7 is formed on one or both upper surfaces (outer surfaces) of the insulating layer 6.
- the obtained sheet is cut by the through-hole 1 and the coil open end face 3 so as to have a desired shape and fired integrally, or is cut by the through-hole 1 and the coil open end face 3 after the integral firing. (LTCC technology).
- the magnetic antenna shown in FIG. 5 is a magnetic antenna according to the present invention, centered on a core composed of the magnetic body 5 and the nonmagnetic body 8, and the electrode material is coiled (wound) outside the core.
- the basic structure is to form an insulating layer on one or both outer surfaces on which the coiled electrode material is formed.
- the core has a structure in which a magnetic material is divided into non-magnetic materials.
- the area ratio (total magnetic material / total nonmagnetic material) of the total magnetic material and the total nonmagnetic material is preferably 1.0 or less in the cross section of the core. If the non-magnetic layer is larger than the above range, the ratio of the magnetic material in the core is reduced, which is disadvantageous for downsizing the magnetic antenna. A more preferred range is 0.5 or less, and even more preferred is 0.2 or less.
- the ratio (S / L) of one cross-sectional area (S) of the magnetic layer forming the core of the magnetic antenna shown in FIG. 5 and the length (L) of the magnetic antenna. ) Is preferably 0.3 or less.
- the area ratio (S / L) exceeds 0.3, it is difficult to reduce the influence of the demagnetizing field.
- the magnetic antenna having the core shown in FIG. 5 can be manufactured, for example, by the following method.
- a magnetic layer formed by laminating a single layer or a plurality of layers in the form of a sheet made of a mixture of magnetic powder and a binder is formed.
- a non-magnetic layer in which a mixture of non-magnetic powder and binder is formed into a sheet or a plurality of layers is formed.
- the magnetic layers 5 and the nonmagnetic layers 8 are alternately laminated so that the total thickness becomes a desired thickness.
- a desired number of through holes 1 are opened in the laminated magnetic layer and nonmagnetic layer.
- An electrode material is poured into each of the through holes.
- the electrode layer 2 is formed on both surfaces perpendicular to the through hole so as to be connected to the through hole and have a coil shape (winding shape).
- a coil is formed by the electrode material and the electrode layer poured into the through hole so that the magnetic layer becomes a rectangular core. At this time, both ends of the magnetic layer forming the coil are open on the magnetic circuit (3 in FIG. 4).
- insulating layers 6 are formed on the upper and lower surfaces of the coil on which the electrode layer is formed.
- the obtained sheet can be manufactured by cutting at the through hole and the open end face of the coil so as to have a desired shape and firing integrally, or by cutting at the through hole and the open end face of the coil after integral firing (LTCC). Technology).
- Ni—Zn ferrite or the like can be used for the core magnetic body.
- Ni—Zn ferrite Fe 2 O 3 45 to 49.5 mol%, NiO 9.0 to 45.0 mol%, ZnO 0.5 to 35.0 mol%, CuO 4.5 to A composition that is 15.0 mol% is preferable, and a ferrite composition that has high magnetic permeability as a material and low magnetic loss in the frequency band to be used may be selected. If a material with a magnetic permeability higher than necessary is used, the magnetic loss increases, making it unsuitable for an antenna.
- a ferrite composition such that the permeability at 13.56 MHz is 70 to 120 for the RFID tag application and the permeability at 10 MHz is 10 to 30 for the consumer FM broadcast reception because the magnetic loss is small.
- the magnetic antenna according to the present invention connects the IC by forming a coil lead terminal and an IC chip connection terminal with an electrode material on the outer surface of the insulating layer.
- a through hole 1 is provided in the insulating layer 6 on at least one surface of the coil 4 on which the electrode layer is formed, and an electrode material is poured into the through hole 1 so that both ends of the coil 4 are provided.
- a coil lead terminal and an IC chip connection terminal are formed with an electrode material on the surface of the insulating layer and integrally fired.
- a capacitor electrode may be disposed on the outer surface of the insulating layer, and an insulating layer may be further provided on the outer surface on which the capacitor electrode is disposed.
- a capacitor may be formed by printing parallel electrodes or comb electrodes on the outer surface of the insulating layer, and may be connected in parallel or in series with the coil lead terminal.
- an insulating layer is further provided on the outer surface on which the capacitor electrode is disposed, and an electrode also serving as an IC chip connection terminal is formed on the outer surface of the insulating layer so that the capacitor is sandwiched between the insulating layers. And may be connected in parallel or in series with the IC chip connection terminal.
- the magnetic antenna according to the present invention may have a terminal structure capable of connecting an IC chip to the outer surface of the insulating layer, and the IC chip connection terminal and the coil lead terminal may be connected in parallel or in series.
- a terminal provided with a variable capacitor may be formed on the outer surface of the insulating layer, and the coil lead terminal and the coil lead terminal may be connected in parallel or in series.
- Ni—Zn ferrite or the like can be used for the core magnetic body.
- Ni—Zn ferrite Fe 2 O 3 45 to 49.5 mol%, NiO 9.0 to 45.0 mol%, ZnO 0.5 to 35.0 mol%, CuO 4.5 to 15
- a composition that is 0.0 mol% is preferable, and a ferrite composition that has high magnetic permeability as a material and low magnetic loss in the frequency band to be used may be selected. If the magnetic permeability as a material is too high, the magnetic loss increases, so that it is not suitable for an antenna.
- a ferrite composition such that the permeability at 13.56 MHz is 70 to 120 for the RFID tag application and the permeability at 10 MHz is 10 to 30 for the consumer FM broadcast reception because the magnetic loss is small.
- the magnetic antenna according to the present invention includes a non-magnetic core material, a non-magnetic ferrite such as a Zn-based ferrite, a glass-based ceramic such as a borosilicate glass, a zinc-based glass, or a lead-based glass, or a non-magnetic ferrite and a glass-based ceramic. What mixed the proper quantity etc. can be used.
- a Zn-based ferrite composition may be selected such that the volume resistivity of the sintered body is 10 8 ⁇ cm or more.
- a composition comprising Fe 2 O 3 45 to 49.5 mol%, ZnO 17.0 to 22.0 mol%, and CuO 4.5 to 15.0 mol% is preferable.
- the composition is such that the difference from the linear expansion coefficient of soft magnetic ferrite used as a magnetic material is within ⁇ 5 ppm / ° C.
- the composite RF tag according to the present invention is arranged so that a portion other than one end in the longitudinal direction is surrounded by a conductive material or a metal material with respect to a magnetic antenna mounted with an IC manufactured by the above-described method, and the gap is filled with a resin.
- the magnetic antenna may be resin-coated by a dip method or the like, and a metal or conductor may be applied to the dried resin-coated surface using a paste or the like.
- the composite RF tag according to the present invention can be embedded in a recess having a predetermined shape such as a metal part or a metal tool.
- a concave portion having a predetermined shape may be formed in advance on an object on which an antenna or tag such as a metal part or metal tool is to be installed.
- the composite RF tag according to the present invention is preferably installed so that the longitudinal direction of the coil (magnetic flux release surface) is perpendicular to the reader.
- the magnetic antenna according to the present invention is formed so that the outer periphery is surrounded by a metal or conductive material, and there is no characteristic deviation such as a resonance frequency when embedding in a metal object, thereby minimizing the influence of communication sensitivity due to changes in the usage environment. Can be suppressed.
- Ni—Zn—Cu ferrite calcined powder with a permeability of 100 at 13.56 MHz after sintering at 900 ° C. Fe 2 O 3 48.5 mol%, NiO 25 mol%, ZnO 16 mol%, CuO 10.5 mol%) 100 parts by weight, butyral resin 8 parts by weight, plasticizer 5 parts by weight, and solvent 80 parts by weight were mixed in a ball mill to produce a slurry.
- the resulting slurry was formed into a sheet by a doctor blade on a PET film so as to have a 150 mm square and a thickness of 0.1 mm upon sintering.
- borosilicate glass SiO 2 86-89 wt%, B 2 O 3 7-10 wt%, K 2 O 0.5-7 wt%
- 8 parts by weight of butyral resin 5 parts by weight of plasticizer Part by weight and 80 parts by weight of solvent were mixed with a ball mill to produce a slurry.
- the resulting slurry was formed into a sheet by a doctor blade on a PET film with a 150 mm square so that the thickness during sintering was 0.05 mm.
- Zn—Cu ferrite calcined powder Fe 2 O 3 48.5 mol%, ZnO 41 mol%, CuO 10.5 mol%) 100 parts by weight, butyral resin 8 parts by weight, plastic A slurry was prepared by mixing 5 parts by weight of the agent and 80 parts by weight of the solvent with a ball mill. The resulting slurry was formed into a sheet with the same size and thickness as the magnetic layer on a PET film with a doctor blade.
- a through-hole 1 is formed in the magnetic layer green sheet, and the Ag paste is filled therein, and the Ag paste is printed on both sides perpendicular to the through-hole 1 to laminate 10 sheets. Then, a coil was formed.
- green sheets for the insulating layer 6 are laminated on the upper and lower surfaces of the coil 4.
- the laminated green sheets are pressure-bonded together, cut at the through-hole and the coil open end face 3, and integrally fired at 900 ° C. for 2 hours to obtain a magnetic material having a width of 10 mm ⁇ length of 3 mm and a coil winding number of 23 turns.
- An antenna 1 was produced. (In the figure, the number of coil turns is simplified. In addition, the number of laminated magnetic layers is represented by three layers for simplification of the figure. The same applies to the other figures below.)
- an RF tag IC is connected to both ends of the coil of the magnetic antenna, and a capacitor is connected in parallel with the IC so that the resonance frequency is adjusted to 13.56 MHz in a state surrounded by metal or conductive material.
- An RF tag was used.
- the obtained RF tag is put into a metal tube (stainless steel) having an outer diameter of 6 mm, an inner diameter of 5 mm, and a length of 15 mm.
- a metal tube stainless steel
- One end of the magnetic antenna is placed on the metal tube so that the center overlaps, and the gap is filled with epoxy resin.
- the other was formed by covering with a metal plate (stainless steel).
- the ratio (c / a) of the inner diameter of the metal tube (c in FIG. 2) to the longest length (a in FIG. 2) of the cross section of the magnetic antenna is 1.4 times.
- the ratio (d / b) of the length (d in FIG. 2) to the length (b in FIG. 2) in the longitudinal direction of the magnetic antenna was 1.5 times.
- the resonance frequency was defined as the peak frequency of the impedance measured with an impedance analyzer 4291A manufactured by Agilent Technologies, Inc.
- the communication distance is the metal or conductive material of the RF tag produced from the pen tip of the pen-type reader / writer (product name TR3-PA001 / TR3-M001B, manufactured by Takaya Co., Ltd.) that is less affected by external metal objects.
- the distance between the antenna and the RF tag at a position as far away as possible at 13.56 MHz was defined as the communication distance.
- RF tag 2 comparative example An IC was mounted on the magnetic antenna manufactured in the same manner as in Example 1, and the resonance frequency was adjusted to 13.56 MHz in the same state to obtain an RF tag. The obtained RF tag was coated with an epoxy resin and evaluated so that it could be installed on the SUS block in the same manner as the RF tag 1.
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Abstract
Description
2:電極層(コイル電極)
3:コイル開放端面
4:コイル
5:磁性層
6:絶縁層
7:導電層
8:非磁性層
17:磁性体アンテナ
20:絶縁物
30:金属物又は導電物
a:磁性体アンテナの最長径
b:金属物又は導電物の内径
c:磁性体アンテナの長手方向の長さ
d:金属物又は導電物の深さ方向の長さ
本発明に係る磁性体アンテナは、外周を金属物もしくは導電物で囲むように形成することで金属物に埋め込む際に共振周波数などの特性ズレがなく使用環境の変化による通信感度の影響を最小限に抑えることができる。
磁性層用として、900℃焼結後に13.56MHzでの材料としての透磁率が100になるNi-Zn-Cuフェライト仮焼粉(Fe2O3 48.5モル%、NiO 25モル%、ZnO 16モル%、CuO 10.5モル%)100重量部、ブチラール樹脂8重量部、可塑剤5重量部、溶剤80重量部をボールミルで混合しスラリーを製造した。出来たスラリーをドクターブレードでPETフィルム上に150mm角で、焼結時の厚みが0.1mmになるようにシート成型した。
共振周波数は、アジレントテクノロジー株式会社製インピーダンスアナライザー4291Aで測定されるインピーダンスのピーク周波数をもって共振周波数とした。
通信距離は、外部金属物の影響が少ないペン型のリーダ/ライタ(株式会社タカヤ製、製品名TR3-PA001/TR3-M001B)のアンテナのペン先を、作製したRFタグの金属物あるいは導電物に覆われていない一端を向け、13.56MHzで通信が可能な限り離れた位置の時のアンテナとRFタグの距離を通信距離とした。
実施例1と同様に製造した磁性体アンテナにそのままICを実装し、そのままの状態で共振周波数が13.56MHzに調整しRFタグとした。得られたRFタグを前記SUSブロックにRFタグ1と同様に設置できるよう、エポキシ樹脂で被覆して評価した。
Claims (7)
- 電磁誘導方式を利用し情報を送受信するための複合RFタグであり、該複合RFタグはICを実装した磁性体アンテナと該磁性体アンテナの周囲に形成された絶縁物と金属物又は導電物とからなり、前記磁性体アンテナは磁性体からなるコアを中心として電極材料がコイル状となるように形成され、前記絶縁物は磁性体アンテナのコイル長手方向の一端を除く周囲に形成され、前記金属物又は導電物は前記絶縁物の外側に形成されていることを特徴とする複合RFタグ。
- 電磁誘導方式を利用し情報を送受信するための複合RFタグであり、該複合RFタグはICを実装した磁性体アンテナと該磁性体アンテナの周囲に形成された絶縁物と金属物又は導電物とからなり、前記磁性体アンテナは磁性体と非磁性体とからなるコアを中心として電極材料がコイル状となるように形成され、前記絶縁物は磁性体アンテナのコイル長手方向の一端を除く周囲に形成され、前記金属物又は導電物は前記絶縁物の外側に形成されている複合RFタグ。
- 請求項1記載の複合RFタグにおいて、前記金属物又は導電物の形状が円形の場合、金属物又は導電物の内径が磁性体アンテナ断面の最長長さの1.0倍以上である複合RFタグ。
- 請求項1記載の複合RFタグにおいて、前記金属物又は導電物の深さ方向の長さが、磁性体アンテナの長手方向の長さの1.0倍以上である複合RFタグ。
- 電磁誘導方式を利用し情報を送受信するための複合磁性体アンテナであり、該複合磁性体アンテナは磁性体アンテナと該磁性体アンテナの周囲に形成された絶縁物と金属物又は導電物とからなり、前記磁性体アンテナは磁性体又は磁性体と非磁性体とからなるコアを中心として電極材料がコイル状となるように形成され、前記絶縁物は磁性体アンテナのコイル長手方向の一端を除く周囲に形成され、前記金属物又は導電物は前記絶縁物の外側に形成されている複合磁性体アンテナ。
- 請求項1~4の何れかに記載の複合RFタグ又は請求項5記載の複合磁性体アンテナを設置した金属部品。
- 請求項1~4の何れかに記載の複合RFタグ又は請求項5記載の複合磁性体アンテナを設置した金属工具。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09746355.8A EP2280450B1 (en) | 2008-05-13 | 2009-05-12 | Composite magnetic antenna and rf tag, metal part and metal instrument having the composite magnetic antenna or the rf tag |
CN200980116892.9A CN102027637B (zh) | 2008-05-13 | 2009-05-12 | 复合磁性体天线和rf标签、设置有该复合磁性体天线或rf标签的金属部件、金属工具 |
US12/992,197 US8479999B2 (en) | 2008-05-13 | 2009-05-12 | Composite magnetic antenna and RF tag, and metal part and metal tool on which the composite magnetic antenna or RF tag is installed |
US13/842,672 US20130206847A1 (en) | 2008-05-13 | 2013-03-15 | Composite magnetic antenna and rf tag, and metal part and metal tool on which the composite magnetic antenna or rf tag is installed |
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JP2008126504A JP5239499B2 (ja) | 2008-05-13 | 2008-05-13 | 複合磁性体アンテナ及びrfタグ、該複合磁性体アンテナ又はrfタグを設置した金属部品、金属工具 |
JP2008-126504 | 2008-05-13 |
Related Child Applications (1)
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US13/842,672 Division US20130206847A1 (en) | 2008-05-13 | 2013-03-15 | Composite magnetic antenna and rf tag, and metal part and metal tool on which the composite magnetic antenna or rf tag is installed |
Publications (1)
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WO2009139148A1 true WO2009139148A1 (ja) | 2009-11-19 |
Family
ID=41318523
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PCT/JP2009/002060 WO2009139148A1 (ja) | 2008-05-13 | 2009-05-12 | 複合磁性体アンテナ及びrfタグ、該複合磁性体アンテナ又はrfタグを設置した金属部品、金属工具 |
Country Status (7)
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US (2) | US8479999B2 (ja) |
EP (1) | EP2280450B1 (ja) |
JP (1) | JP5239499B2 (ja) |
KR (1) | KR101593252B1 (ja) |
CN (1) | CN102027637B (ja) |
TW (1) | TWI520430B (ja) |
WO (1) | WO2009139148A1 (ja) |
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Also Published As
Publication number | Publication date |
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KR20110015415A (ko) | 2011-02-15 |
US20130206847A1 (en) | 2013-08-15 |
JP5239499B2 (ja) | 2013-07-17 |
KR101593252B1 (ko) | 2016-02-12 |
TWI520430B (zh) | 2016-02-01 |
EP2280450A1 (en) | 2011-02-02 |
US20110101113A1 (en) | 2011-05-05 |
JP2009278292A (ja) | 2009-11-26 |
EP2280450B1 (en) | 2017-11-08 |
CN102027637B (zh) | 2016-03-16 |
EP2280450A4 (en) | 2014-05-07 |
CN102027637A (zh) | 2011-04-20 |
US8479999B2 (en) | 2013-07-09 |
TW201006034A (en) | 2010-02-01 |
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