WO2013191178A1 - Shield material for loop antenna, shield unit, and shield tag - Google Patents

Shield material for loop antenna, shield unit, and shield tag Download PDF

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Publication number
WO2013191178A1
WO2013191178A1 PCT/JP2013/066743 JP2013066743W WO2013191178A1 WO 2013191178 A1 WO2013191178 A1 WO 2013191178A1 JP 2013066743 W JP2013066743 W JP 2013066743W WO 2013191178 A1 WO2013191178 A1 WO 2013191178A1
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WO
WIPO (PCT)
Prior art keywords
shield
tag
loop antenna
sheet
thickness
Prior art date
Application number
PCT/JP2013/066743
Other languages
French (fr)
Japanese (ja)
Inventor
荻野　哲
直輝 大村
Original Assignee
株式会社新日本電波吸収体
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 株式会社新日本電波吸収体 filed Critical 株式会社新日本電波吸収体
Priority to KR20147035291A priority Critical patent/KR20150032665A/en
Priority to CN201380031491.XA priority patent/CN104396360A/en
Priority to JP2013529502A priority patent/JPWO2013191178A1/en
Publication of WO2013191178A1 publication Critical patent/WO2013191178A1/en

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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
    • G06K19/07771—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
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • H01F27/366—Electric or magnetic shields or screens made of ferromagnetic material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/36—Electric or magnetic shields or screens
    • 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
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/526—Electromagnetic shields
    • 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

Definitions

  • the present invention relates to a shield material for a loop antenna, a shield unit, and a shield tag, and in particular, a shield material for a loop antenna that can be suitably used in an RFID (Radio Frequency Identification) system and an NFC (Near Field Communication) system, and a shield It relates to a unit and a shield tag.
  • RFID Radio Frequency Identification
  • NFC Near Field Communication
  • Patent Document 1 Japanese Patent Application Laid-Open No. H10-228667 discloses a shield layer made of a flat soft magnetic metal material having a large real part of the complex relative permeability ⁇ . According to Patent Document 1, even when metal is present in the vicinity, if this shield layer is provided in the magnetic field, the magnetic lines of force pass through the shield layer in a concentrated manner. It can be said that the magnetic field in this area can be prevented from leaking to the other area.
  • Patent Document 1 discloses that for an electromagnetic wave of 13.56 MHz, the real part ⁇ ′ of the complex relative permeability ⁇ is 30 or more. According to the above, it is understood that the value does not reach 100.
  • the thickness of the entire shield sheet usually exceeds 160 ⁇ m when sufficient shield characteristics are to be obtained. This is because, in general, when a shield layer of the same soft magnetic metal material is used, the communication distance between the reader / writer can be increased as the thickness thereof increases.
  • an object of the present invention is to reduce the thickness of the shield sheet in consideration of the above circumstances.
  • a shield material for a loop antenna includes, for example, a shield material having a permeability of 200 or more and a thickness of 60 ⁇ m or less with respect to an electromagnetic wave of 13.56 MHz, and at least one of the shield materials. And a resin film attached to the surface via an adhesive layer.
  • the shield unit of the present invention is The loop antenna shielding material; Release paper in which the shield material for the loop antenna is arranged, And a pressure-sensitive adhesive layer formed between the release paper and the loop antenna shield material.
  • the shield tag of the present invention is The loop antenna shielding material; A loop antenna connected to the tag, The loop antenna is covered with a shield material for the loop antenna.
  • FIG. 1 is a schematic explanatory view of a shield tag according to Embodiment 1 of the present invention.
  • the shield tag of the present embodiment is a shield tag that can be suitably used for an ISO15693 standard IC tag. As shown in FIG. 1, the shield tag of this embodiment is roughly divided into a known RFID tag 200 and a shield sheet 100 which is a shield unit attached to the RFID tag 200.
  • the RFID tag 200 includes an IC tag 210 on which an IC chip is mounted, a loop antenna 220 connected to the IC tag 210, and a tag base 230 on which the IC tag 210 and the loop antenna 220 are placed.
  • the IC tag 210 is not necessarily provided in the RFID tag 200 itself, and may be provided separately from the RFID tag 200 and electrically connected thereto.
  • the shield sheet 100 is a sheet made of, for example, a PET film or a polyimide film having a thickness of 5 ⁇ m to 30 ⁇ m to which strip-shaped shield materials 101a to 101c or the like which are shield materials for a loop antenna and the shield materials 101a to 101c are attached.
  • a base material 120 and a release paper 130 attached to the back surface of the sheet base material 120 with respect to the application surfaces of the shield materials 101a to 101c and the like via an adhesive layer are provided. The conditions for the shield material 101a and the like will be described later.
  • the shield tag of the present embodiment does not necessarily include the shield sheet 100 itself, and functionally, the shield tag only needs to include the shield materials 101a to 101c included in the shield sheet 100.
  • the sheet base 120 is not essential for constituting the shield sheet 100.
  • the shield sheet 100 covers one or both sides with a resin film such as a PET film or a polyimide film.
  • a resin film such as a PET film or a polyimide film.
  • an adhesive layer may be provided on the entire surface of the sheet substrate 120, and the shield materials 101a to 101c and the like may be arranged thereon, and then a PET film may be attached.
  • the adhesive layer may be formed using an acrylic or silicon-based adhesive.
  • the shield materials 101a to 101c and the like may be overlapped in accordance with the shape and size of the loop antenna 220 or the place where the RFID tag 200 is installed.
  • the release sheet 130 of the shield sheet 100 is peeled off, the tag base 230 and the sheet base 120 are aligned, and the adhesive layer of the sheet base 120 is formed. What is necessary is just to affix on the tag base material 230.
  • an alloy foil whose main material is iron can be used.
  • so-called PC permalloy foil can be used.
  • PC permalloy is an alloy containing nickel, molybdenum, copper, iron, etc., and has a distribution ratio of nickel 77 wt% to 78 wt%, molybdenum 5 wt%, copper 4 wt%, and iron remaining.
  • the shield materials 101a to 101c and the like can be alloy foils containing iron, copper, niobium, silicon, boron, cobalt-based amorphous, and the like.
  • Finemet registered trademark manufactured by Hitachi Metals, Ltd. can be used.
  • the thickness of the entire shield sheet 100 excluding the release paper 130 is 80 ⁇ m or less, regardless of which is used.
  • the breakdown is as follows.
  • the shield materials 101a to 101c etc. are about 24 ⁇ m, and the general-purpose adhesive layer is about 5 ⁇ m to about 30 ⁇ m.
  • the PET film is about 30 ⁇ m.
  • the entire thickness of the shield sheet 100 excluding the release paper 130 is about 70 ⁇ m, and even if a thick adhesive layer is used, it may be about 85 ⁇ m.
  • the corresponding thicknesses are about 150 ⁇ m and about 160 ⁇ m, respectively, so that it is possible to reduce the thickness to about 1 ⁇ 2 compared to these. Become.
  • the entire thickness of the shielding sheet 100 excluding the release paper 130 is 110 ⁇ m or less. Also in this case, the thickness can be reduced to about 2/3 as compared with the conventional typical shield sheet.
  • the communication improvement effect by the shield sheet is adjusted based on the thickness and magnetic permeability of the shield material.
  • the magnetic permeability of the shield material must be increased.
  • the shield materials 101a to 101c and the like according to the present embodiment are made of PC permalloy, fine met, etc., and their magnetic permeability is 200 or more with respect to electromagnetic waves in frequency bands of 13.56 MHz, 135 KHz, 100 KHz, 90 KHz. is there.
  • the magnetic permeability of the shield material increases when a high magnetic permeability material such as niobium is added by several atomic%.
  • the shield sheet 100 of the present embodiment is the magnetic permeability, shape, and size of the shield materials 101a to 101c and the arrangement of the shield materials 101a to 101c and the like with respect to the sheet substrate 120. It is in.
  • an alloy foil having a thickness of 30 ⁇ m or less should be selected. Otherwise, in some cases, since the shield materials 101a to 101c and the like use the above-described PC permalloy foil tape in a two-layered manner, when considering the thickness of the sheet substrate 120 and the PET film, This is because the entire shield sheet 100 cannot be made so thin as compared to the case. In such a case, it has been found that the magnetic permeability of the shield materials 101a to 101c and the like should be approximately 200 or more.
  • the shield material acts in the same manner as the metal existing in the vicinity of the RFID tag 200, the energy of the magnetic field is lost. This reduces the communication effect.
  • the strip-shaped shield materials 101a to 101c are used, and even if the current cancellation occurs between the shield materials 101a to 101c, the shield materials 101a to 101c are stuck. In such a position, the cancellation is avoided.
  • the shield members 101a to 101c and the like are arranged so as to cover the antenna coil constituting the loop antenna 220 and to be orthogonal to the extending direction.
  • the distance between the shield material 101a and the shield material 101b may be 3 mm to 15 mm, for example, and is 10 mm in this embodiment.
  • the distance between the shield material 101b and the shield material 101c may be set to the same condition as this.
  • the conventional typical shield sheet is usually provided with a shield material having the same shape as the shield sheet body, but naturally, the area of the shield material also becomes relatively large. Since the shield material is generally expensive, the cost of the shield sheet 100 is relatively high. On the other hand, in the case of this embodiment, since the area of a shield material may be small, the cost of the shield sheet 100 can be suppressed.
  • the length of the shield material 101a and the like may reach the inner side of the innermost circumference of the antenna coil constituting the loop antenna 220, for example, about 3 mm to 5 mm.
  • the width of the shield material 101a and the like may be about 5 mm to 10 mm, for example.
  • the number of shield materials 101a and the like may be determined according to the size of the RFID tag 200. However, in order to easily process the shield sheet 100, shield materials 101a to 101c and the like may be pasted over both ends of the sheet substrate 120.
  • FIG. 1 shows three shield materials that respectively oppose the shield materials 101a to 101c, but instead of these three sets of opposing shield materials, the shield materials 101a to 101c are replaced with the sheet base material 120. It is good also as an integral thing extended from end to end.
  • the shield material 101 may be provided at a position corresponding to the IC tag 210 and a position corresponding to a connection line connecting the IC tag 210 and the loop antenna 220. This is because the cancellation described above can be avoided also in these places.
  • the shield sheet 100 can be covered with a resin film, and the shield tag of the present embodiment only needs to include the shield material 101 functionally. From this point of view, the relationship between the shield material 101 and the resin film will be added.
  • the shield material 101 can be considered to cover one side with a resin film or both sides through an adhesive layer.
  • the resin film contributes to maintaining the shape of the shield sheet 100 and preventing the shield material 101 from being oxidized.
  • one of the resin films and the adhesive layer attached thereto also function as a spacer between the shield material 101 and the loop antenna 220.
  • the shielding material 101 Only the first side of the shielding material 101, it is conceivable to cover a resin film over the first adhesive layer. In this case, the shield material 101 will stick the 2nd surface which is not covered with the resin film to the tag base material 230 through another adhesive layer. The first surface of the shield material 101 is prevented from oxidation by being blocked from the outside air by the resin film, and the second surface is prevented from being oxidized by being blocked from the outside air by the other adhesive layer.
  • the resin film does not necessarily need to be a single layer, and may be composed of multiple layers. In such a case, since only the other adhesive layer functions as a spacer, it is also a method to make the thickness sufficient to function as a spacer.
  • the adhesive layer depends on the frequency band related to the loop antenna 220, in the case of an electromagnetic wave of 13.56 MHz, it is preferable to secure about 15 ⁇ m.
  • the resin film contributes to maintaining the shape of the shield material 101 before being attached to the tag base material 230, and contributes to oxidation prevention after being attached to the tag base material 230.
  • the resin film contributes to maintaining the shape of the shield material 101 before being attached to the tag base material 230, and contributes to oxidation prevention after being attached to the tag base material 230.
  • it is necessary to prevent oxidation from the second surface of the shield material 101.
  • the second adhesive layer and the resin film on the second surface side function as spacers. Therefore, in this case, the thickness of the second adhesive layer may be relatively thinner than that of the first embodiment due to the presence of the resin film incidental thereto. 2
  • the total thickness of the adhesive layer and the resin film may be about 15 ⁇ m.
  • the second adhesive layer contributes to the prevention of oxidation, and if the release paper is peeled off, the shield material 101 is attached to the tag base through the second adhesive layer. It can be easily attached to the material 230.
  • the second adhesive layer functions as a spacer, the thickness of the second adhesive layer should be approximately the same as that of the first aspect.
  • the fourth aspect can include all the elements of the first to third aspects. Specifically, it is conceivable that any of the resin films of the shield material 101 of the second aspect is covered with a release paper via a third adhesive layer. If the release paper is peeled off, the shield material 101 can be easily attached to the tag base material 230 through the third adhesive layer.
  • the second and third adhesive layers and the resin film therebetween function as spacers. Therefore, in this case, the thickness of the second adhesive layer may be relatively thin as compared with the case of the first aspect due to the presence of the resin film incidental thereto. Specifically, in the above example, the total thickness of the second and third adhesive layers and the resin film therebetween may be about 15 ⁇ m.
  • the shield sheet of the present embodiment needs to have a total thickness of 80 ⁇ m or less. What is necessary is just to adjust the total thickness of the shield sheet of this embodiment with the thickness of each adhesion layer and each resin film.
  • the adhesive layer generally has a thickness of at least about 10 ⁇ m. The thickness of the resin film may be determined based on the total thickness of the shield sheet.
  • the shielding material 101 having a thickness of about 18 ⁇ m, the first adhesive layer having a thickness of about 10 ⁇ m, and about 5 ⁇ m.
  • the other adhesive layer on the second surface side may be about 15 ⁇ m in the case of the above example.
  • FIG. 2 is a schematic diagram of a shield tape 300 that is a shield unit including the shield materials 101a to 101c shown in FIG.
  • FIG. 2 shows the above-described shield materials 101a to 101c and the release paper 140 to which the shield material 101a and the like are attached.
  • An adhesive layer (not shown) formed between the shield materials 101a to 101c and the release paper 140 is provided.
  • the shield materials 101a to 101c may be covered with a resin film such as a PET film or a polyimide film.
  • a resin film such as a PET film or a polyimide film.
  • an adhesive layer may be provided on the entire surface of the release paper 140, and the shield materials 101a to 101c may be arranged thereon, and then a PET film may be attached.
  • the length of the shield tape 300 may be, for example, 1 m to 10 m.
  • the shield materials 101a to 101c are pasted on the release paper 140 with an interval of, for example, 5 mm to 15 mm. Accordingly, when the shield sheet 100 is manufactured, for example, the shield tape 300 is cut to a required length, and then the shield materials 101a to 101c are integrally attached to the sheet substrate 120 while peeling the release paper 140. Thus, the shield materials 101a to 101c can be arranged on the sheet base material 120 at equal intervals.
  • the order of the process of attaching the shield materials 101a to 101c to the sheet base material 120 and cutting the shield tape 300 may be changed. Also in this case, the mutual spacing of the shield materials 101a to 101c on the sheet base material 120 can be easily maintained.
  • FIG. 3 is a schematic illustration of a shield tag according to the second embodiment of the present invention, which corresponds to FIG. 1.
  • shield materials 101a to 101d are formed at positions corresponding to the four sides of the substantially rectangular loop antenna 220, instead of the shield materials 101a to 101c described above.
  • the shield materials 101a and 101c have the same shape, and the shield materials 101b and 101d have the same shape.
  • the width of the shield material 101a to the shield material 101d may be equal to or larger than the width of the loop antenna 220 (the distance between the innermost antenna coil and the outermost antenna coil). In order to cover the width direction of the antenna 220, for example, the width is about 2 mm larger than the width of the loop antenna 220.
  • the shield tag created by attaching the shield sheet 100 to the RFID tag 200 was verified with a reader / writer compatible with the ISO 14443 standard for the NFC system.
  • the width of the loop antenna 220 is 4 mm
  • the width of the shield material 101a and the like is 6 mm
  • the center of the width of the loop antenna 220 and the center of the width of the shield material 101a and the like are matched, It was confirmed that good communication characteristics can be obtained when 101a and the like protrude from the loop antenna 220 by 1 mm on both sides.
  • the communication distance between the shield tag and the reader / writer is saturated even when the width of the shield material 101a or the like is larger. In this case, it is preferable to reduce the material cost of the entire shield tag by reducing the amount of use of the shield material 101a and the like. Conversely, it has also been found that if the width of the shield material 101a or the like is less than the width of the loop antenna, the communication characteristics deteriorate in proportion to the phenomenon of the width.
  • the loop antenna and the shielding material 101a with respect to the total area of the loop antenna (area surrounded by the outer edge defined by the innermost antenna coil and the outer edge defined by the outermost antenna coil). It was found that the total area of the overlapping portions with ⁇ 101d should be approximately 50% or more. Further, it was found that the communication distance characteristic takes a peak value near 70% and decreases when the total area ratio is increased toward 100%. The communication distance characteristic depends on the material constant of the shield material attached to the antenna, and the peak value can be predicted by the impedance characteristic of the antenna when the shield material is mounted.
  • the reason why the total area ratio may be 50% or more is that currently available shield tags have a communication distance of about 10 mm to 20 mm, but if the total area ratio is 50% or more, 20 mm This is because the above communication distance can be realized.
  • the manufacturing cost is almost the same as that of the shield tag currently on the market. And can be manufactured at low cost.
  • the shield material 101a or the like is attached to the RFID tag 200 through the sheet base material 120 .
  • a plurality of shield materials 101a and the like covered with a resin film or the like are prepared, and an appropriate material is prepared. It is also possible to place them in place.
  • the contents described in the embodiments of the present invention can also be applied to wireless power feeding in which power is transmitted without using a metal contact or a connector.
  • FIG. 2 is a schematic diagram of a shield tape 300 including shield materials 101a to 101c shown in FIG. It is typical explanatory drawing of the shield tag of Embodiment 2 of this invention.
  • Shield Sheet 101a to 101c Shield Material 100 Shield Sheet 101a to 101c Shield Material 120 Sheet Base Material 130 Release Paper 140 Release Paper 200 RFID Tag 210 IC Tag 220 Loop Antenna 230 Tag Base Material 300 Shield Tape

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
  • Details Of Aerials (AREA)
  • Regulation Of General Use Transformers (AREA)
  • Aerials With Secondary Devices (AREA)

Abstract

[Problem] To provide a shield tag having a shield sheet with reduced thickness and capable of being used suitably in RFID systems and NFC systems. [Solution] The present invention is equipped with: an IC tag (210) on which an IC chip is mounted; a loop antenna (220) connected to the IC tag (210); a tag base material (230) on which the IC tag (210) and the loop antenna (220) are mounted; and a sheet base material (120) that is attached to the tag base material (230) and has multiple strip-shaped shield materials (101a-101c) having a magnetic permeability of 200 or greater with respect to 13.56 MHz electromagnetic waves and having a thickness of 60 μm or less.

Description

ループアンテナ用シールド材、シールドユニット、及びシールドタグShield material for loop antenna, shield unit, and shield tag
　本発明は、ルループアンテナ用シールド材、シールドユニット、及びシールドタグに関し、特に、ＲＦＩＤ（Radio Frequency IDentification）システム、ＮＦＣ（Near Field Communication）システムに好適に用いることができるループアンテナ用シールド材、シールドユニット、及びシールドタグに関する。 The present invention relates to a shield material for a loop antenna, a shield unit, and a shield tag, and in particular, a shield material for a loop antenna that can be suitably used in an RFID (Radio Frequency Identification) system and an NFC (Near Field Communication) system, and a shield It relates to a unit and a shield tag.
　従来、近傍に金属が存在する場合であっても、磁界のエネルギーを損失させることなく、磁界を集中させて通過させることができるタグ用磁気シールドシートがある（特許文献１）。特許文献１には、複素比透磁率μの実部が大きい扁平な軟磁性金属材料から成るシールド層より構成されたものが開示されている。特許文献１によれば、近傍に金属が存在する場合であっても、このシールド層を磁界中に設けると、磁力線がシールド層を集中して通るようになるため、磁気シールドシートによって仕切られる一方の領域の磁界が他方の領域に漏れることを防ぐことができる、とされている。また、特許文献１には、１３．５６ＭＨｚの電磁波に対しては、複素比透磁率μの実部μ’が３０以上のものとすることが開示されているが、実部μ’は図２等によれば１００には到底及ばないことがわかる。 2. Description of the Related Art Conventionally, there is a magnetic shield sheet for a tag that allows a magnetic field to be concentrated and passed without losing the energy of the magnetic field even when metal is present in the vicinity (Patent Document 1). Japanese Patent Application Laid-Open No. H10-228667 discloses a shield layer made of a flat soft magnetic metal material having a large real part of the complex relative permeability μ. According to Patent Document 1, even when metal is present in the vicinity, if this shield layer is provided in the magnetic field, the magnetic lines of force pass through the shield layer in a concentrated manner. It can be said that the magnetic field in this area can be prevented from leaking to the other area. Patent Document 1 discloses that for an electromagnetic wave of 13.56 MHz, the real part μ ′ of the complex relative permeability μ is 30 or more. According to the above, it is understood that the value does not reach 100.
特開２００６－００５３６５号公報JP 2006-005365 A
　しかし、特許文献１に開示されているシールドシートの場合、十分なシールド特性を得ようとした場合には、通常、シールドシート全体の厚さが１６０μｍを超えてしまう。これは、一般的には、同じ軟磁性金属材料のシールド層の用いた場合には、その厚みが増すほど、リーダライタとの間の通信距離を長くすることができるからである。 However, in the case of the shield sheet disclosed in Patent Document 1, the thickness of the entire shield sheet usually exceeds 160 μm when sufficient shield characteristics are to be obtained. This is because, in general, when a shield layer of the same soft magnetic metal material is used, the communication distance between the reader / writer can be increased as the thickness thereof increases.
　一方、近年、携帯電話機、スマートフォンなどのモバイル機器の薄型化の進展は目覚ましく、これを実現するためには、モバイル機器なの種々の部品についても薄型化することが求められている。もちろん、モバイル機器が典型的であるが、他業種においても薄型化の要請はある。 On the other hand, in recent years, mobile devices such as mobile phones and smartphones have been progressing in thinning, and in order to realize this, various parts such as mobile devices are required to be thinned. Of course, mobile devices are typical, but there is a demand for thinning in other industries.
　そこで、本発明は、上記事情を考慮して、シールドシートを薄型化することを課題とする。 Therefore, an object of the present invention is to reduce the thickness of the shield sheet in consideration of the above circumstances.
　上記課題を解決するために、本発明のループアンテナ用シールド材は、例えば１３．５６ＭＨｚの電磁波に対して透磁率が２００以上で厚さが６０μｍ以下のシールド材と、前記シールド材の少なくとも一方の面に粘着層を介して貼付された樹脂フィルムとを備える。 In order to solve the above problems, a shield material for a loop antenna according to the present invention includes, for example, a shield material having a permeability of 200 or more and a thickness of 60 μm or less with respect to an electromagnetic wave of 13.56 MHz, and at least one of the shield materials. And a resin film attached to the surface via an adhesive layer.
　また、本発明のシールドユニットは、
　前記ループアンテナ用シールド材と、
　前記ループアンテナ用シールド材が配列されている剥離紙と、
　前記ループアンテナ用シールド材と前記剥離紙との間に形成されている粘着層と、を備える。 The shield unit of the present invention is
The loop antenna shielding material;
Release paper in which the shield material for the loop antenna is arranged,
And a pressure-sensitive adhesive layer formed between the release paper and the loop antenna shield material.
　さらに、本発明のシールドタグは、
　前記ループアンテナ用シールド材と、
　タグに接続されるループアンテナと、を備え、
　前記ループアンテナは、前記ループアンテナ用シールド材によって覆われている。 Furthermore, the shield tag of the present invention is
The loop antenna shielding material;
A loop antenna connected to the tag,
The loop antenna is covered with a shield material for the loop antenna.
発明の実施の形態BEST MODE FOR CARRYING OUT THE INVENTION
　以下、本発明の実施形態について図面を参照して説明する。なお、各図面において、同様の部分には同一符号を付している。また、図面間の尺度及び各図に示す部材の数等は、説明の都合上、実際のものとは異なっている場合もあるので留意されたい。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to the same part. In addition, it should be noted that the scale between the drawings and the number of members shown in each drawing may be different from the actual ones for convenience of explanation.
　（実施形態１）
　図１は、本発明の実施形態１のシールドタグの模式的な説明図である。本実施形態のシールドタグは、ＩＳＯ１５６９３規格のＩＣタグに好適に用いることができるシールドタグである。図１に示すように、本実施形態のシールドタグは、既知のＲＦＩＤタグ２００と、これに貼付されるシールドユニットであるところのシールドシート１００とに大別される。 (Embodiment 1)
FIG. 1 is a schematic explanatory view of a shield tag according to Embodiment 1 of the present invention. The shield tag of the present embodiment is a shield tag that can be suitably used for an ISO15693 standard IC tag. As shown in FIG. 1, the shield tag of this embodiment is roughly divided into a known RFID tag 200 and a shield sheet 100 which is a shield unit attached to the RFID tag 200.
　ＲＦＩＤタグ２００は、既知のように、ＩＣチップが搭載されたＩＣタグ２１０と、ＩＣタグ２１０に接続されているループアンテナ２２０と、ＩＣタグ２１０及びループアンテナ２２０が載置されるタグ基材２３０とを備える。なお、ＩＣタグ２１０は、ＲＦＩＤタグ２００自体に設けられていることが必須ではなく、ＲＦＩＤタグ２００とは別に設けられていて、電気的に接続されていてもよい。 As is known, the RFID tag 200 includes an IC tag 210 on which an IC chip is mounted, a loop antenna 220 connected to the IC tag 210, and a tag base 230 on which the IC tag 210 and the loop antenna 220 are placed. With. Note that the IC tag 210 is not necessarily provided in the RFID tag 200 itself, and may be provided separately from the RFID tag 200 and electrically connected thereto.
　シールドシート１００は、ループアンテナ用シールド材であるところの帯状のシールド材１０１ａ～１０１ｃ等と、シールド材１０１ａ～１０１ｃ等が貼付されている例えば５μｍ～３０μｍ厚のＰＥＴフィルム又はポリイミドフィルムなどからなるシート基材１２０と、シート基材１２０における各シールド材１０１ａ～１０１ｃ等の貼付面に対する裏面に粘着層を介して貼付されている剥離紙１３０とを備える。なお、シールド材１０１ａ等の条件については後述する。 The shield sheet 100 is a sheet made of, for example, a PET film or a polyimide film having a thickness of 5 μm to 30 μm to which strip-shaped shield materials 101a to 101c or the like which are shield materials for a loop antenna and the shield materials 101a to 101c are attached. A base material 120 and a release paper 130 attached to the back surface of the sheet base material 120 with respect to the application surfaces of the shield materials 101a to 101c and the like via an adhesive layer are provided. The conditions for the shield material 101a and the like will be described later.
　なお、後述するように、本実施形態のシールドタグは、シールドシート１００自体を備えることが必須ではなく、機能的には、シールドシート１００に含まれるシールド材１０１ａ～１０１ｃを備えればよく、したがって、例えばシート基材１２０がシールドシート１００を構成するために必須というわけではない点に留意されたい。 As will be described later, the shield tag of the present embodiment does not necessarily include the shield sheet 100 itself, and functionally, the shield tag only needs to include the shield materials 101a to 101c included in the shield sheet 100. For example, it should be noted that the sheet base 120 is not essential for constituting the shield sheet 100.
　本実施形態では、シールドシート１００は、その片面又は両面をＰＥＴフィルム、ポリイミドフィルムなどの樹脂フィルムで覆っている。係る場合には、シート基材１２０の表面全体に粘着層を設け、この上にシールド材１０１ａ～１０１ｃ等を配列し、ついで、ＰＥＴフィルムを貼付するとよい。粘着層は、例えば、アクリル又はシリコンベースの接着剤を用いて形成することが考えられる。また、シールド材１０１ａ～１０１ｃ等は、ループアンテナ２２０形状や寸法、或いは、ＲＦＩＤタグ２００設置場所等に応じて２枚重ねとしてもよい。 In this embodiment, the shield sheet 100 covers one or both sides with a resin film such as a PET film or a polyimide film. In such a case, an adhesive layer may be provided on the entire surface of the sheet substrate 120, and the shield materials 101a to 101c and the like may be arranged thereon, and then a PET film may be attached. For example, the adhesive layer may be formed using an acrylic or silicon-based adhesive. Further, the shield materials 101a to 101c and the like may be overlapped in accordance with the shape and size of the loop antenna 220 or the place where the RFID tag 200 is installed.
　ＲＦＩＤタグ２００にシールドシート１００を貼り付ける際には、シールドシート１００の剥離紙１３０を剥がしてから、タグ基材２３０とシート基材１２０とを位置合わせして、シート基材１２０の粘着層をタグ基材２３０に貼付すればよい。 When the shield sheet 100 is attached to the RFID tag 200, the release sheet 130 of the shield sheet 100 is peeled off, the tag base 230 and the sheet base 120 are aligned, and the adhesive layer of the sheet base 120 is formed. What is necessary is just to affix on the tag base material 230.
　シールド材１０１ａ～１０１ｃ等は、鉄を主原料とした合金箔を用いることができる。一例としては、いわゆるＰＣパーマロイ箔を用いることができる。ＰＣパーマロイは、ニッケル、モリブデン、銅、鉄などを含む合金で、ニッケルが７７ｗｔ％～７８ｗｔ％、モリブデンが５ｗｔ％、銅が４ｗｔ％、鉄が残りという配分比で構成されている。 For the shield materials 101a to 101c, etc., an alloy foil whose main material is iron can be used. As an example, so-called PC permalloy foil can be used. PC permalloy is an alloy containing nickel, molybdenum, copper, iron, etc., and has a distribution ratio of nickel 77 wt% to 78 wt%, molybdenum 5 wt%, copper 4 wt%, and iron remaining.
　また、シールド材１０１ａ～１０１ｃ等は、鉄、銅、ニオブ、シリコン、ボロン、コバルト基アモルファスなどを含む合金箔とすることもできる。一例としては、日立金属社製のファインメット（登録商標）を用いることができる。 Further, the shield materials 101a to 101c and the like can be alloy foils containing iron, copper, niobium, silicon, boron, cobalt-based amorphous, and the like. As an example, Finemet (registered trademark) manufactured by Hitachi Metals, Ltd. can be used.
　上記合金箔は、通常、いずれも３０μｍ以下の厚さであることから、いずれを用いたとしても、剥離紙１３０を除いたシールドシート１００全体の厚さは８０μｍ以下となる。その概略内訳は、ＥＳＤ　ＥＭＡＩエンジニアリング社のＰＣパーマロイ箔テープＴ８０２７を用いた場合にはシールド材１０１ａ～１０１ｃ等が約２４μｍ、そのほか、汎用的な粘着層が約５μｍ～約３０μｍで、同じく汎用的なＰＥＴフィルムが約３０μｍ程度である。 Since the above alloy foils are usually 30 μm or less in thickness, the thickness of the entire shield sheet 100 excluding the release paper 130 is 80 μm or less, regardless of which is used. The breakdown is as follows. When using PC permalloy foil tape T8027 of ESD EMAI Engineering, the shield materials 101a to 101c etc. are about 24 μm, and the general-purpose adhesive layer is about 5 μm to about 30 μm. The PET film is about 30 μm.
　したがって、平均的な厚さの粘着層を用いた場合には剥離紙１３０を除いたシールドシート１００全体の厚さは約７０μｍとなり、厚めの粘着層を用いたとしても、約８５μｍで済む。一方、従来の典型的なシールドシートの場合には、対応する厚さはそれぞれ、約１５０μｍと約１６０μｍであるから、これらに比して、その厚みを約１／２にまで減ずることが可能となる。 Therefore, when the adhesive layer having an average thickness is used, the entire thickness of the shield sheet 100 excluding the release paper 130 is about 70 μm, and even if a thick adhesive layer is used, it may be about 85 μm. On the other hand, in the case of the conventional typical shield sheet, the corresponding thicknesses are about 150 μm and about 160 μm, respectively, so that it is possible to reduce the thickness to about ½ compared to these. Become.
　また、仮に、シールド材１０１ａ～１０１ｃ等を２枚重ねで用いたとしても、剥離紙１３０を除いたシールドシート１００全体の厚さは１１０μｍ以下となる。この場合にも、従来の典型的なシールドシートに比して、その厚みを約２／３にまで減ずることが可能となる。 Even if two sheets of the shielding materials 101a to 101c are used in an overlapping manner, the entire thickness of the shielding sheet 100 excluding the release paper 130 is 110 μm or less. Also in this case, the thickness can be reduced to about 2/3 as compared with the conventional typical shield sheet.
　ところで、一般的には、シールドシートによる通信の改善効果は、そのシールド材の厚さと透磁率とに基づいて調整される。シールド材を薄くした場合には、シールド材の素材の透磁率を増加させなければならない。 By the way, generally, the communication improvement effect by the shield sheet is adjusted based on the thickness and magnetic permeability of the shield material. When the shield material is made thin, the magnetic permeability of the shield material must be increased.
　本実施形態に係るシールド材１０１ａ～１０１ｃ等は、ＰＣパーマロイ、ファインメット等を材料としており、これらの透磁率は、１３．５６ＭＨｚ、１３５ＫＨｚ、１００ＫＨｚ、９０ＫＨｚといった周波数帯域      の電磁波に対して２００以上である。シールド材の透磁率は、ニオブのように高透磁材料を数アトミック％添加すると増大する。 The shield materials 101a to 101c and the like according to the present embodiment are made of PC permalloy, fine met, etc., and their magnetic permeability is 200 or more with respect to electromagnetic waves in frequency bands of 13.56 MHz, 135 KHz, 100 KHz, 90 KHz. is there. The magnetic permeability of the shield material increases when a high magnetic permeability material such as niobium is added by several atomic%.
　ここで、本実施形態のシールドシート１００が十分なシールド効果を得るために重要なのは、シールド材１０１ａ～１０１ｃ等の透磁率、形状、大きさ及びシート基材１２０に対するシールド材１０１ａ～１０１ｃ等の配置にある。 Here, what is important for the shield sheet 100 of the present embodiment to obtain a sufficient shielding effect is the magnetic permeability, shape, and size of the shield materials 101a to 101c and the arrangement of the shield materials 101a to 101c and the like with respect to the sheet substrate 120. It is in.
　まず、本実施形態に係るシールド材１０１ａ～１０１ｃ等は、少なくとも厚さを３０μｍ以下の合金箔を選択すべきである。さもないと、場合によっては、シールド材１０１ａ～１０１ｃ等は、既述のＰＣパーマロイ箔テープを２枚重ねで用いることから、シート基材１２０及びＰＥＴフィルムの厚さを考慮した場合に、従来のものに比して、シールドシート１００全体をさほど薄くすることができないからである。そして、係る場合には、シールド材１０１ａ～１０１ｃ等の透磁率は、概ね２００以上とするとよいことがわかった。 First, for the shield materials 101a to 101c according to the present embodiment, an alloy foil having a thickness of 30 μm or less should be selected. Otherwise, in some cases, since the shield materials 101a to 101c and the like use the above-described PC permalloy foil tape in a two-layered manner, when considering the thickness of the sheet substrate 120 and the PET film, This is because the entire shield sheet 100 cannot be made so thin as compared to the case. In such a case, it has been found that the magnetic permeability of the shield materials 101a to 101c and the like should be approximately 200 or more.
　また、上記のような合金箔を選択した場合、従来のシールド材のような形状を採用したのでは、レンツの法則により、図示しないリーダライタとの間で通信をするためにループアンテナ２２０に流れる電流の向きに対して逆向きに流れる電流が発生してしまう。これでは、両電流が相互に打ち消しあうことになるため、ＲＦＩＤタグ２００からの信号をリーダライタで受信できなくなる。 In addition, when an alloy foil as described above is selected, if a shape like a conventional shield material is adopted, it flows to the loop antenna 220 in order to communicate with a reader / writer (not shown) according to Lenz's law. A current that flows in a direction opposite to the direction of the current is generated. In this case, both currents cancel each other, so that the signal from the RFID tag 200 cannot be received by the reader / writer.
　この場合には、言ってみれば、シールド材が、ＲＦＩＤタグ２００の近傍に存在する金属と同様の作用をするため、磁界のエネルギーを損失させてしまうからである。これでは、通信効果が低下することになる。 In this case, in other words, because the shield material acts in the same manner as the metal existing in the vicinity of the RFID tag 200, the energy of the magnetic field is lost. This reduces the communication effect.
　そこで、図１に示すように帯状のシールド材１０１ａ～１０１ｃ等を採用し、シールド材１０１ａ～１０１ｃ等の間では、上記の電流の打ち消しが生じても、シールド材１０１ａ～１０１ｃ等が貼付されている位置では当該打ち消しを回避するようにしている。 Therefore, as shown in FIG. 1, the strip-shaped shield materials 101a to 101c are used, and even if the current cancellation occurs between the shield materials 101a to 101c, the shield materials 101a to 101c are stuck. In such a position, the cancellation is avoided.
　シールド材１０１ａ～１０１ｃ等は、ループアンテナ２２０を構成するアンテナコイルを覆う態様で、その延在方向に直交させるといった配置をしている。シールド材１０１ａとシールド材１０１ｂとの間隔は、たとえば、３ｍｍ～１５ｍｍとすればよく、本実施形態では、たとえば１０ｍｍとしている。シールド材１０１ｂとシールド材１０１ｃとの間隔等も、これと同条件とすればよい。 The shield members 101a to 101c and the like are arranged so as to cover the antenna coil constituting the loop antenna 220 and to be orthogonal to the extending direction. The distance between the shield material 101a and the shield material 101b may be 3 mm to 15 mm, for example, and is 10 mm in this embodiment. The distance between the shield material 101b and the shield material 101c may be set to the same condition as this.
　ここで、従来の典型的なシールドシートは、通常、シールドシート本体と同形状のシールド材を備えているが、そうすると、当然、シールド材の面積も相対的に大きくなる。シールド材は、一般に高価なので、シールドシート１００のコストは相対的に高くなる。一方、本実施形態の場合には、シールド材の面積が小さくて済むので、シールドシート１００のコストを抑えることができる。 Here, the conventional typical shield sheet is usually provided with a shield material having the same shape as the shield sheet body, but naturally, the area of the shield material also becomes relatively large. Since the shield material is generally expensive, the cost of the shield sheet 100 is relatively high. On the other hand, in the case of this embodiment, since the area of a shield material may be small, the cost of the shield sheet 100 can be suppressed.
　また、シールド材１０１ａ等の長さは、ループアンテナ２２０を構成するアンテナコイルの最内周よりも内側に、たとえば３ｍｍ～５ｍｍ程度まで到達するようにすればよい。さらに、シールド材１０１ａ等の幅は、たとえば、５ｍｍ～１０ｍｍ程度とすればよい。シールド材１０１ａ等の数は、ＲＦＩＤタグ２００の大きさに応じて決定すればよい。もっとも、シールドシート１００を容易に加工するために、シールド材１０１ａ～１０１ｃ等を、シート基材１２０の両端に亘って貼付してもよい。 In addition, the length of the shield material 101a and the like may reach the inner side of the innermost circumference of the antenna coil constituting the loop antenna 220, for example, about 3 mm to 5 mm. Further, the width of the shield material 101a and the like may be about 5 mm to 10 mm, for example. The number of shield materials 101a and the like may be determined according to the size of the RFID tag 200. However, in order to easily process the shield sheet 100, shield materials 101a to 101c and the like may be pasted over both ends of the sheet substrate 120.
　すなわち、図１には、シールド材１０１ａ～１０１ｃにそれぞれ対向する３つのシールド材を示しているが、これらの各対向する３組のシールド材に代えて、シールド材１０１ａ～１０１ｃをシート基材１２０の端から端まで伸ばした一体のものとしてもよい。また、シールド材１０１は、ＩＣタグ２１０に対応する位置及びＩＣタグ２１０とループアンテナ２２０とを結ぶ接続線に対応する位置にも設けるとよい。こうすると、これらの箇所においても、既述の打ち消しを回避できるからである。 In other words, FIG. 1 shows three shield materials that respectively oppose the shield materials 101a to 101c, but instead of these three sets of opposing shield materials, the shield materials 101a to 101c are replaced with the sheet base material 120. It is good also as an integral thing extended from end to end. The shield material 101 may be provided at a position corresponding to the IC tag 210 and a position corresponding to a connection line connecting the IC tag 210 and the loop antenna 220. This is because the cancellation described above can be avoided also in these places.
　ここで、既述のように、シールドシート１００を樹脂フィルムによって覆うことができ、本実施形態のシールドタグは機能的にはシールド材１０１を備えればよい。この視点から見て、シールド材１０１と樹脂フィルムとの関係について付言しておく。 Here, as described above, the shield sheet 100 can be covered with a resin film, and the shield tag of the present embodiment only needs to include the shield material 101 functionally. From this point of view, the relationship between the shield material 101 and the resin film will be added.
　まず、シールド材１０１は、粘着層を介して、その片面を樹脂フィルムで覆う場合と、両面を覆う場合とが考えられる。前者の場合には、樹脂フィルムは、シールドシート１００の形状保持及びシールド材１０１の酸化防止に寄与する。これに対して、後者の場合には、樹脂フィルムの一方及びそれに付帯する粘着層は、シールド材１０１とループアンテナ２２０との間のスペーサとしても機能する。 First, the shield material 101 can be considered to cover one side with a resin film or both sides through an adhesive layer. In the former case, the resin film contributes to maintaining the shape of the shield sheet 100 and preventing the shield material 101 from being oxidized. On the other hand, in the latter case, one of the resin films and the adhesive layer attached thereto also function as a spacer between the shield material 101 and the loop antenna 220.
　つぎに、樹脂フィルムとシールド材１０１との関係について説明する。まず、シールド材１０１を樹脂フィルムで覆う態様としては、以下の４つの態様が考えられる。 Next, the relationship between the resin film and the shield material 101 will be described. First, the following four modes are conceivable as modes for covering the shield material 101 with a resin film.
　（第１の態様）
　シールド材１０１の第１面のみを、第１粘着層を介して樹脂フィルムで覆うことが考えられる。この場合、シールド材１０１は、樹脂フィルムで覆われていない第２面を、他の粘着層を介してタグ基材２３０に貼付することになる。シールド材１０１の第１面は樹脂フィルムによって外気と遮断されることで酸化防止が図られ、第２面は上記他の粘着層によって外気と遮断されることで酸化防止が図られる。 (First aspect)
Only the first side of the shielding material 101, it is conceivable to cover a resin film over the first adhesive layer. In this case, the shield material 101 will stick the 2nd surface which is not covered with the resin film to the tag base material 230 through another adhesive layer. The first surface of the shield material 101 is prevented from oxidation by being blocked from the outside air by the resin film, and the second surface is prevented from being oxidized by being blocked from the outside air by the other adhesive layer.
　なお、樹脂フィルムについては、必ずしも単層である必要はなく、複層で構成してもよい。また、係る場合には、上記他の粘着層のみがスペーサとして機能することになるから、スペーサとして機能するのに十分な厚さとすることも一法である。具体的には、粘着層は、ループアンテナ２２０に係る周波数帯域にもよるが、１３．５６ＭＨｚの電磁波の場合には、１５μｍ程度を確保するとよい。 In addition, about the resin film, it does not necessarily need to be a single layer, and may be composed of multiple layers. In such a case, since only the other adhesive layer functions as a spacer, it is also a method to make the thickness sufficient to function as a spacer. Specifically, although the adhesive layer depends on the frequency band related to the loop antenna 220, in the case of an electromagnetic wave of 13.56 MHz, it is preferable to secure about 15 μm.
　（第２の態様）
　第２の態様としては、第１の態様のシールド材１０１における第２面も、第２粘着層を介して樹脂フィルムで覆うことが考えられる。第１の態様の場合には、タグ基材２３０に添付される前には、樹脂フィルムがシールド材１０１の形状保持に寄与するし、タグ基材２３０に添付された後には、酸化防止に寄与するが、シールド材１０１が製造されてからタグ基材２３０に添付されるまでに長期間を要する場合には、シールド材１０１の第２面からの酸化防止をする必要がある。 (Second aspect)
As a 2nd aspect, it is possible to cover also the 2nd surface in the shielding material 101 of a 1st aspect with a resin film through a 2nd adhesion layer. In the case of the first aspect, the resin film contributes to maintaining the shape of the shield material 101 before being attached to the tag base material 230, and contributes to oxidation prevention after being attached to the tag base material 230. However, when it takes a long time from when the shield material 101 is manufactured to be attached to the tag base material 230, it is necessary to prevent oxidation from the second surface of the shield material 101.
　このため、シールド材１０１の第１及び第２面の双方を樹脂フィルムで覆うことが考えられる。なお、係る場合には、第２面側の第２粘着層及び樹脂フィルムがスペーサとして機能することになる。したがって、この場合には、第２粘着層の厚さは、それに付帯する樹脂フィルムの存在により、第１の態様の場合に比して相対的に薄くてよく、上記の例でいえば、第２粘着層及び樹脂フィルムの総厚さが１５μｍ程度となればよい。 For this reason, it is conceivable to cover both the first and second surfaces of the shield material 101 with a resin film. In such a case, the second adhesive layer and the resin film on the second surface side function as spacers. Therefore, in this case, the thickness of the second adhesive layer may be relatively thinner than that of the first embodiment due to the presence of the resin film incidental thereto. 2 The total thickness of the adhesive layer and the resin film may be about 15 μm.
　（第３の態様）
　第３の態様としては、第１の態様のシールド材１０１における第２面を、第２粘着層を介して剥離紙で覆うことが考えられる。第３の態様の場合には、第２の態様と同様に、第２粘着層が酸化防止に寄与するし、また、剥離紙を剥がせば、第２粘着層を通じて、シールド材１０１をタグ基材２３０に容易に貼付することができる。なお、係る場合には、第２粘着層がスペーサとして機能することになるから、第２粘着層の厚さは、第１の態様と同程度とすべきである。 (Third aspect)
As a 3rd aspect, it is possible to cover the 2nd surface in the shielding material 101 of a 1st aspect with a release paper through a 2nd adhesion layer. In the case of the third aspect, as in the second aspect, the second adhesive layer contributes to the prevention of oxidation, and if the release paper is peeled off, the shield material 101 is attached to the tag base through the second adhesive layer. It can be easily attached to the material 230. In this case, since the second adhesive layer functions as a spacer, the thickness of the second adhesive layer should be approximately the same as that of the first aspect.
　（第４の態様）
　第４の態様としては、第１～第３の態様の全ての要素を含むものとすることができる。具体的には、第２の態様のシールド材１０１のいずれかの樹脂フィルムにたいして、第３粘着層を介して、剥離紙で覆うことが考えられる。そして、剥離紙を剥がせば、第３粘着層を通じて、シールド材１０１をタグ基材２３０に容易に貼付することができる。 (Fourth aspect)
The fourth aspect can include all the elements of the first to third aspects. Specifically, it is conceivable that any of the resin films of the shield material 101 of the second aspect is covered with a release paper via a third adhesive layer. If the release paper is peeled off, the shield material 101 can be easily attached to the tag base material 230 through the third adhesive layer.
　なお、係る場合には、第２及び第３粘着層とその間の樹脂フィルムとがスペーサとして機能することになる。したがって、この場合には、第２粘着層の厚さは、それに付帯する樹脂フィルムの存在により、第１の態様の場合に比して相対的に薄くてよい。具体的には、上記の例でいえば、第２及び第３粘着層とその間の樹脂フィルムとの総厚さが１５μｍ程度となればよい。 In such a case, the second and third adhesive layers and the resin film therebetween function as spacers. Therefore, in this case, the thickness of the second adhesive layer may be relatively thin as compared with the case of the first aspect due to the presence of the resin film incidental thereto. Specifically, in the above example, the total thickness of the second and third adhesive layers and the resin film therebetween may be about 15 μm.
　ところで、本実施形態のシールドシートは、総厚さを８０μｍ以下とすることが必要である。本実施形態のシールドシートの総厚さは、各粘着層及び各樹脂フィルムの厚さで調整すればよい。ただ、粘着層は、その十分な粘着効果を得られるようにするためには、一般的には、少なくとも１０μｍ程度の厚さは確保するとよい。樹脂フィルムの厚さは、シールドシートの総厚さに基づいて決定すればよい。 Incidentally, the shield sheet of the present embodiment needs to have a total thickness of 80 μm or less. What is necessary is just to adjust the total thickness of the shield sheet of this embodiment with the thickness of each adhesion layer and each resin film. However, in order to obtain the sufficient adhesive effect, the adhesive layer generally has a thickness of at least about 10 μm. The thickness of the resin film may be determined based on the total thickness of the shield sheet.
　そうすると、例えば、第１の態様の場合には、単に各部材の厚さの一例を示すと、１８μｍ程度の厚さのシールド材１０１と、１０μｍ程度の厚さの第１粘着層と、５μｍ程度の厚さの樹脂フィルムを用いることができ、係る場合には、第２面側の他の粘着層は上記の例の場合には、１５μｍ程度とすればよい。この場合、シールドシートの総厚さは、［１８μｍ＋１０μｍ＋５μｍ＋１５μ＝４８μｍ］ということになる。 Then, for example, in the case of the first aspect, simply showing an example of the thickness of each member, the shielding material 101 having a thickness of about 18 μm, the first adhesive layer having a thickness of about 10 μm, and about 5 μm. In such a case, the other adhesive layer on the second surface side may be about 15 μm in the case of the above example. In this case, the total thickness of the shield sheet is [18 μm + 10 μm + 5 μm + 15 μ = 48 μm].
　図２は、図１に示すシールド材１０１ａ～１０１ｃを含むシールドユニットであるところのシールドテープ３００の模式図である。図２には、既述のシールド材１０１ａ～１０１ｃと、シールド材１０１ａ等が貼付されている剥離紙１４０とを示している。シールド材１０１ａ～１０１ｃと剥離紙１４０との間に形成されている図示しない粘着層が設けられている。 FIG. 2 is a schematic diagram of a shield tape 300 that is a shield unit including the shield materials 101a to 101c shown in FIG. FIG. 2 shows the above-described shield materials 101a to 101c and the release paper 140 to which the shield material 101a and the like are attached. An adhesive layer (not shown) formed between the shield materials 101a to 101c and the release paper 140 is provided.
　また、シールド材１０１ａ～１０１ｃは、ＰＥＴフィルム、ポリイミドフィルムなどの樹脂フィルムで覆ってもよい。係る場合には、剥離紙１４０の表面全体に粘着層を設け、この上にシールド材１０１ａ～１０１ｃを配列し、ついで、ＰＥＴフィルムを貼付するとよい。 The shield materials 101a to 101c may be covered with a resin film such as a PET film or a polyimide film. In such a case, an adhesive layer may be provided on the entire surface of the release paper 140, and the shield materials 101a to 101c may be arranged thereon, and then a PET film may be attached.
　シールドテープ３００の長さは、たとえば１ｍ～１０ｍとすればよい。シールド材１０１ａ～１０１ｃは、剥離紙１４０上で相互に、たとえば５ｍｍ～１５ｍｍの間隔を空けて貼付されている。したがって、シールドシート１００を製造する際には、たとえば、シールドテープ３００を所要の長さに切断し、その後、剥離紙１４０を剥がしながら、シールド材１０１ａ～１０１ｃをシート基材１２０に一体的に貼付すれば、シールド材１０１ａ～１０１ｃをシート基材１２０に等間隔で配置することが可能となる。 The length of the shield tape 300 may be, for example, 1 m to 10 m. The shield materials 101a to 101c are pasted on the release paper 140 with an interval of, for example, 5 mm to 15 mm. Accordingly, when the shield sheet 100 is manufactured, for example, the shield tape 300 is cut to a required length, and then the shield materials 101a to 101c are integrally attached to the sheet substrate 120 while peeling the release paper 140. Thus, the shield materials 101a to 101c can be arranged on the sheet base material 120 at equal intervals.
　なお、シールド材１０１ａ～１０１ｃのシート基材１２０への貼付とシールドテープ３００の切断との工程順を変更してもよい。この場合にも、シート基材１２０でのシールド材１０１ａ～１０１ｃの相互の間隔を容易に保持することができる。 It should be noted that the order of the process of attaching the shield materials 101a to 101c to the sheet base material 120 and cutting the shield tape 300 may be changed. Also in this case, the mutual spacing of the shield materials 101a to 101c on the sheet base material 120 can be easily maintained.
　（実施形態２）
　図３は、本発明の実施形態２のシールドタグの模式的な説明図であり、図１に対応するものである。図３に示すシールドタグは、既述のシールド材１０１ａ～１０１ｃに代えて、略長方形状のループアンテナ２２０の四辺に対応する位置にシールド材１０１ａ～１０１ｄを形成している。 (Embodiment 2)
Figure 3 is a schematic illustration of a shield tag according to the second embodiment of the present invention, which corresponds to FIG. 1. In the shield tag shown in FIG. 3, shield materials 101a to 101d are formed at positions corresponding to the four sides of the substantially rectangular loop antenna 220, instead of the shield materials 101a to 101c described above.
　ここでは、シールド材１０１ａ，１０１ｃは同形状としており、シールド材１０１ｂ，１０１ｄも同形状としている。シールド材１０１ａ～シールド材１０１ｄの幅は、いずれも、ループアンテナ２２０の幅（最内周のアンテナコイルと最外周のアンテナコイルとの間隔）以上であればよいが、実際には、確実にループアンテナ２２０の幅方向を覆えるように、例えば、ループアンテナ２２０の幅よりも２ｍｍ程度の幅としている。 Here, the shield materials 101a and 101c have the same shape, and the shield materials 101b and 101d have the same shape. The width of the shield material 101a to the shield material 101d may be equal to or larger than the width of the loop antenna 220 (the distance between the innermost antenna coil and the outermost antenna coil). In order to cover the width direction of the antenna 220, for example, the width is about 2 mm larger than the width of the loop antenna 220.
　この点につき、シールドシート１００をＲＦＩＤタグ２００に貼付して作成したシールドタグにつき、ＮＦＣシステム用のＩＳＯ１４４４３規格対応のリーダ／ライタで検証してみた。なお、シールドタグの条件としては、ループアンテナ２２０の幅を４ｍｍとし、シールド材１０１ａ等の幅を６ｍｍとし、ループアンテナ２２０の幅の中心とシールド材１０１ａ等の幅の中心とを合わせ、シールド材１０１ａ等がループアンテナ２２０に対して、その両側１ｍｍずつはみ出る場合に、良好な通信特性が得られることを確認した。 Regarding this point, the shield tag created by attaching the shield sheet 100 to the RFID tag 200 was verified with a reader / writer compatible with the ISO 14443 standard for the NFC system. In addition, as conditions for the shield tag, the width of the loop antenna 220 is 4 mm, the width of the shield material 101a and the like is 6 mm, the center of the width of the loop antenna 220 and the center of the width of the shield material 101a and the like are matched, It was confirmed that good communication characteristics can be obtained when 101a and the like protrude from the loop antenna 220 by 1 mm on both sides.
　なお、シールド材１０１ａ等の幅をそれ以上としても、シールドタグとリーダ／ライタとの通信距離は飽和状態になることがわかった。この場合、シールド材１０１ａ等の使用量を少なくして、シールドタグ全体の材料費を抑えることが好ましい。また、逆に、シールド材１０１ａ等の幅をループアンテナの幅未満とすると、その幅の現象に比例して通信特性が悪くなることもわかった。 It has been found that the communication distance between the shield tag and the reader / writer is saturated even when the width of the shield material 101a or the like is larger. In this case, it is preferable to reduce the material cost of the entire shield tag by reducing the amount of use of the shield material 101a and the like. Conversely, it has also been found that if the width of the shield material 101a or the like is less than the width of the loop antenna, the communication characteristics deteriorate in proportion to the phenomenon of the width.
　また、実験によって、ループアンテナの総面積（最内周のアンテナコイルで規定される外縁と最外周のアンテナコイルで規定される外縁とによって囲まれた面積）に対して、ループアンテナとシールド材１０１ａ～１０１ｄとの重複部分の総面積が概ね５０％以上とすることがよいことがわかった。さらに、通信距離特性は総面積比を１００％に向けて増加させると、７０％付近でピーク値をとりそれ以上では減少する事が分かった。なお、通信距離特性は、アンテナに貼付するシールド材の材料定数に依存し、シールド材実装時のアンテナのインピーダンス特性によりピーク値を予測することができる。 In addition, by experiment, the loop antenna and the shielding material 101a with respect to the total area of the loop antenna (area surrounded by the outer edge defined by the innermost antenna coil and the outer edge defined by the outermost antenna coil). It was found that the total area of the overlapping portions with ~ 101d should be approximately 50% or more. Further, it was found that the communication distance characteristic takes a peak value near 70% and decreases when the total area ratio is increased toward 100%. The communication distance characteristic depends on the material constant of the shield material attached to the antenna, and the peak value can be predicted by the impedance characteristic of the antenna when the shield material is mounted.
　上記の総面積比が５０％以上でよいとする根拠は、現在市販されているシールドタグは、概ね、１０ｍｍ～２０ｍｍ程度の通信距離であるところ、総面積比が５０％以上であれば、２０ｍｍ以上の通信距離を実現できたからである。 The reason why the total area ratio may be 50% or more is that currently available shield tags have a communication distance of about 10 mm to 20 mm, but if the total area ratio is 50% or more, 20 mm This is because the above communication distance can be realized.
　しかも、総面積比が１００％となるシールドタグであっても、現在市販されているシールドタグと同程度の製造費で済むことから、本実施形態のシールドタグは、現在の市販品よりも性能に優れ、かつ、安価に製造することができる。 Moreover, even if the shield tag has a total area ratio of 100%, the manufacturing cost is almost the same as that of the shield tag currently on the market. And can be manufactured at low cost.
　なお、シールド材１０１ａ等を、このように貼付した場合にも、実施形態１で説明したような打ち消しを回避することが可能となる。 Note that even when the shield material 101a or the like is attached in this way, it is possible to avoid cancellation as described in the first embodiment.
　以上、本発明の各実施形態では、シート基材１２０を通じてシールド材１０１ａ等をＲＦＩＤタグ２００に貼付する例を説明したが、樹脂フィルム等で覆われたシールド材１０１ａ等を複数用意して、適材適所に、これらを配置することも可能である。また、本発明の各実施形態で説明した内容は、金属接点やコネクタなどを介さずに電力を伝送するといったワイヤレス給電にも適用することができる。 As described above, in each embodiment of the present invention, the example in which the shield material 101a or the like is attached to the RFID tag 200 through the sheet base material 120 has been described. However, a plurality of shield materials 101a and the like covered with a resin film or the like are prepared, and an appropriate material is prepared. It is also possible to place them in place. The contents described in the embodiments of the present invention can also be applied to wireless power feeding in which power is transmitted without using a metal contact or a connector.
本発明の実施形態１のシールドタグの模式的な説明図である。It is typical explanatory drawing of the shield tag of Embodiment 1 of this invention. 図１に示すシールド材１０１ａ～１０１ｃ等を含むシールドテープ３００の模式図である。FIG. 2 is a schematic diagram of a shield tape 300 including shield materials 101a to 101c shown in FIG. 本発明の実施形態２のシールドタグの模式的な説明図である。It is typical explanatory drawing of the shield tag of Embodiment 2 of this invention.
　１００　シールドシート
　１０１ａ～１０１ｃ　シールド材
　１２０　シート基材
　１３０　剥離紙
　１４０　剥離紙
　２００　ＲＦＩＤタグ
　２１０　ＩＣタグ
　２２０　ループアンテナ
　２３０　タグ基材
　３００　シールドテープ 100 Shield Sheet 101a to 101c Shield Material 120 Sheet Base Material 130 Release Paper 140 Release Paper 200 RFID Tag 210 IC Tag 220 Loop Antenna 230 Tag Base Material 300 Shield Tape

Claims (3)

  1. 　電磁波に対して透磁率が２００以上で厚さが６０μｍ以下のシールド材と、
    　前記シールド材の少なくとも一方の面に粘着層を介して貼付された樹脂フィルムとを備える、ループアンテナ用シールド材。     A shielding material having a magnetic permeability of 200 or more and a thickness of 60 μm or less with respect to electromagnetic waves;
    And a resin film which is attached via an adhesive layer on at least one surface of the shielding material, shielding material for a loop antenna.
  2. 　電磁波に対して透磁率が２００以上で厚さが６０μｍ以下のシールド材と、
    　前記シールド材が配列されている剥離紙と、
    　前記シールド材と前記剥離紙との間に形成されている粘着層と、を備えるシールドユニット。     A shielding material having a magnetic permeability of 200 or more and a thickness of 60 μm or less with respect to electromagnetic waves;
    Release paper in which the shield material is arranged;
    Shield unit and a pressure-sensitive adhesive layer formed between the release paper and the shield member.
  3. 　電磁波に対して透磁率が２００以上で厚さが６０μｍ以下のシールド材と、
    　ＩＣタグに接続されるループアンテナと、を備え、
    　前記ループアンテナは、前記シールド材によって覆われている、シールドタグ。     A shielding material having a magnetic permeability of 200 or more and a thickness of 60 μm or less with respect to electromagnetic waves;
    A loop antenna connected to the IC tag,
    The loop antenna is a shield tag covered with the shield material.
PCT/JP2013/066743 2012-06-19 2013-06-18 Shield material for loop antenna, shield unit, and shield tag WO2013191178A1 (en)

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Publication number Priority date Publication date Assignee Title
US10971808B2 (en) 2016-06-15 2021-04-06 3M Innovative Properties Company Shielded RFID antenna
WO2018077580A1 (en) * 2016-10-26 2018-05-03 Robert Bosch Gmbh Protection device for an inductive energy transmission system and inductive energy transmission system
US11119053B2 (en) 2017-06-23 2021-09-14 3M Innovative Properties Company Wireless sensing devices including stable near-field antenna

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KR20150032665A (en) 2015-03-27
TW201403948A (en) 2014-01-16
JPWO2013191178A1 (en) 2016-05-26
CN104396360A (en) 2015-03-04

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