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WO2008018211A1 - Feuille magnétique, dispositif d'antenne et procédé de fabrication de dispositif d'antenne - Google Patents

Feuille magnétique, dispositif d'antenne et procédé de fabrication de dispositif d'antenne Download PDF

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Publication number
WO2008018211A1
WO2008018211A1 PCT/JP2007/058232 JP2007058232W WO2008018211A1 WO 2008018211 A1 WO2008018211 A1 WO 2008018211A1 JP 2007058232 W JP2007058232 W JP 2007058232W WO 2008018211 A1 WO2008018211 A1 WO 2008018211A1
Authority
WO
WIPO (PCT)
Prior art keywords
ferrite sintered
antenna
magnetic sheet
sintered body
antenna device
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2007/058232
Other languages
English (en)
Japanese (ja)
Inventor
Keisuke Aramaki
Satoru Sugita
Yoshito Ikeda
Takeshi Nakazawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dexerials Corp
Original Assignee
Sony Chemical and Information Device Corp
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.)
Filing date
Publication date
Application filed by Sony Chemical and Information Device Corp filed Critical Sony Chemical and Information Device Corp
Publication of WO2008018211A1 publication Critical patent/WO2008018211A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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 sheet suitable for use in IC cards, IC tags, and the like, an antenna device, and a method for manufacturing the antenna device.
  • This RFID system is a small non-contact integrated circuit (hereinafter referred to as an IC) device that stores various data called a transbonder so that it can be read and Z or writable, and has a communication function.
  • This is a technology that performs data reading and Z or writing without contact with the transponder by performing wireless communication with the Z writer.
  • This RFID system configures a transponder as an IC tag and attaches the IC tag to a product to perform production and logistics management.
  • the transponder is configured as an IC card to collect charges for transportation. It is expected to be used for various purposes such as ID cards, and even electronic money.
  • an IC card or an IC tag an IC card in which information is stored and a resonance capacitor are electrically connected to an antenna coil is known. These are the transmission / reception antenna power of the reader / writer. By transmitting radio waves of a predetermined frequency to the antenna coil, the information stored in the IC chip can be read, or whether the power can resonate with radio waves of a specific frequency. It is configured to be identified or monitored by In addition to this, many IC cards and IC tags are configured to be able to update information stored in the IC chip and write history information.
  • an antenna module in which a soft magnetic material is inserted so as to be substantially parallel to the plane of the antenna coil with respect to the antenna coil wound in a plane.
  • soft magnetic material made of amorphous sheet or electromagnetic steel plate is By inserting the antenna module so as to be substantially parallel to the plane of the tenor coil, the antenna module as a whole is made thinner.
  • the soft magnetic material is also an amorphous sheet or an electromagnetic steel plate
  • the force that can be used when the carrier frequency is about 100 kHz is obtained.
  • the frequency becomes as high as several tens of MHz an eddy current is generated in the amorphous sheet or electromagnetic steel sheet, which is a soft magnetic material, and the Q value is lowered. Therefore, this antenna module cannot be applied to IC cards and IC tags using RFID technology that operates at a carrier frequency of 13.56 MHz.
  • a ferrite sintered body is conventionally known as a soft magnetic material that can cope with a high frequency.
  • the ferrite sintered body is a brittle material, if it is formed thin in order to meet the recent demand for thinner IC cards and IC tags, it becomes brittle and has impact resistance. There is a problem that it is extremely low. Therefore, by forming a soft magnetic material with a composite material of soft magnetic metal, amorphous powder or ferrite powder or flakes and plastic or rubber, the rigidity is higher than when using a fragile ferrite sintered body. and relatively high ⁇ frequency Nio, antenna coils adapted to be used has been proposed (e.g., see Patent Document 2, etc..) 0
  • Patent Document 3 is configured by laminating an antenna coil wound in a spiral shape in a plane and a ferrite sintered body disposed so as to be substantially parallel to the plane of the antenna coil.
  • An antenna module is disclosed.
  • the antenna coil described in Patent Document 2 may be incorporated into various communication devices. Therefore, if there is a metal object in the vicinity even if it is not an article to be identified, the effect is affected. It becomes easy to receive.
  • a technology has been proposed in which a metal shield plate is attached to the back surface (attached surface) of the communication surface to suppress fluctuations in communication characteristics due to metal objects.
  • fluctuations in the communication characteristics of the antenna coil are suppressed by the shield plate. Conversely, this means that the communication characteristics of the antenna coil are lowered to a certain level by the shield plate. It also becomes.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2000-48152
  • Patent Document 2 Japanese Patent Laid-Open No. 2002-325013
  • Patent Document 3 Japanese Unexamined Patent Publication No. 2000-113142
  • the present invention has been made in view of such circumstances, and can achieve high rigidity while using a ferrite sintered body that is a brittle material, and realize excellent communication characteristics.
  • An object of the present invention is to provide a magnetic sheet that can be used, an antenna device, and a method for manufacturing the antenna device.
  • the magnetic sheet according to the present invention that achieves the above-mentioned object is formed by spreading a plurality of flat ferrite sintered bodies, and the ferrite sintered body has a thickness of D ⁇ m. ],
  • the area of the main surface is A [mm 2 ]
  • the length of the major axis is LI [mm]
  • the length of the minor axis is L2 [mm]
  • the thickness is small while maintaining good communication characteristics. It will become cracked and cracked, and will become curved.
  • the ferrite sintered body has a principal surface with a side of less than 5 mm and a thickness of 50 mm. / zm or more 550 Those less than ⁇ m are desirable.
  • the plurality of ferrite sintered bodies are made of a low dielectric having a relative dielectric constant of less than 500, which is desired to be bonded to each other by a bonding agent made of a material with a small electromagnetic wave transmission loss. It is particularly desirable to be bonded together by a bonding agent.
  • the plurality of ferrite sintered bodies may be a laminated body in which a plurality of the sintered ferrite bodies are laminated in the thickness direction of the magnetic sheet.
  • the inductance changes according to the number of layers of the sintered sintered body, so that the communication distance can be changed. That is, the magnetic sheet according to the present invention can cope with various communication characteristics and can greatly increase the degree of design freedom.
  • the plurality of ferrite sintered bodies are filled and spread so as not to generate a gap in the same plane from the viewpoint of reducing waste materials and meeting the demand for thinning. Furthermore, depending on the shape of the principal surface of the plurality of ferrite sintered bodies, there is a case where a gap is formed when trying to spread the same in the same plane.
  • a plurality of the ferrite sintered bodies are laminated in stages so as not to generate a gap, or a predetermined magnetic powder is mixed in a gap between the plurality of ferrite sintered bodies spread in the same plane. May be added.
  • an antenna device that achieves the above-described object is an antenna device having an antenna coil, and a plurality of antenna substrates on which the antenna coil is mounted and the antenna coil are covered.
  • a magnetic sheet formed by laying a flat ferrite sintered body of the above is disposed in a state where the main surfaces thereof are joined to each other, and the ferrite sintered body has a thickness of D ⁇ m],
  • the area of the surface is A [mm 2 ]
  • the length of the major axis is LI [mm]
  • the length of the minor axis is L2 [mm]
  • the thickness is small while maintaining good communication characteristics. It will become cracked and cracked, and will become curved.
  • the above-described bonding with the antenna substrate is performed.
  • a predetermined metal shield plate may be bonded to the main surface opposite to the main surface of the magnetic sheet.
  • the antenna device may be configured such that the antenna coil is electrically connected to an external IC chip, and an IC chip mounting surface is formed on the antenna substrate.
  • the antenna coil may be configured to be electrically connected to the IC chip mounted on the IC chip mounting surface.
  • the antenna device according to the present invention in the former configuration, since it is not necessary to incorporate an IC chip, it is possible to reduce the thickness. In the latter configuration, Since there is no need for external connection with the IC chip, the degree of freedom in design can be increased, and the mounting work for the mounted body can be facilitated.
  • a method for manufacturing an antenna device that achieves the above-described object is a method for manufacturing an antenna device having an antenna coil, and a plurality of methods are provided so as to cover the antenna coil mounted on an antenna substrate.
  • the ferrite sintered body has a thickness of D [m], a main surface area of A [mm 2], and a major axis length of LI [ mm] and the length of the short axis is L2 [mm]
  • the size of the main surface of the sintered sintered body becomes smaller than a predetermined value, high rigidity is achieved while using a ferrite sintered body that is a brittle material. Can be realized, and excellent communication characteristics can be realized.
  • FIG. 1 (a) is a plan view of an antenna module shown as an embodiment of the present invention when viewed from the antenna substrate side.
  • FIG. 1 (b) is a side view of an antenna module shown as an embodiment of the present invention.
  • FIG. 2 is a bottom view of the antenna module shown as an embodiment of the present invention when a magnetic core member side cover is seen.
  • FIG. 3 (a) is a diagram for explaining the meaning of terms used for the shape of a ferrite sintered body, and is a plan view of a flight sintered body having a square main surface.
  • FIG. 3 (b) is a diagram for explaining the meaning of terms used in the shape of a ferrite sintered body, and is a plan view of a ferrite sintered body having a rectangular main surface.
  • FIG. 3 (c) is a diagram for explaining the meaning of terms used for the shape of a ferrite sintered body, and is a plan view of a flight sintered body having a polygonal main surface.
  • FIG. 4 is a side view of an antenna module shown as an embodiment of the present invention, and is a diagram illustrating a configuration in which a shield plate is provided on the antenna module shown in FIGS. 1 (a) and 1 (b).
  • FIG. 5 is a diagram for explaining a state when the antenna module shown in FIG. 4 is incorporated in a communication device.
  • FIG. 6 is a diagram for explaining the state of a drop test.
  • FIG. 7 (a) is a plan view of the antenna module shown as the embodiment of the present invention when viewed from the antenna substrate side, and is a plan view of the antenna module different from the configuration shown in FIG. 1 (a).
  • FIG. 7 (b) is a side view of the antenna module shown as the embodiment of the present invention, and is a side view of the antenna module different from the configuration shown in FIG. 1 (b).
  • FIG. 8 is a side view of an antenna module shown as an embodiment of the present invention, and is a diagram illustrating a configuration in which a shield plate is provided on the antenna module shown in FIGS. 7 (a) and 7 (b).
  • This embodiment is used in a V, so-called RFID (Radio Frequency IDentification) system, which stores various data in a readable and Zable or writable manner and has a communication function.
  • This is an antenna module in which data is read and Z or written without contact by the reader Z writer by wireless communication with the writer.
  • this antenna module is formed in a thin plate shape such as an IC (Integrated Circuit) force IC tag, and can achieve high rigidity while using a ferrite sintered body as a magnetic core member. Is.
  • the antenna module includes an antenna substrate 10 on which an antenna coil is mounted and a magnetic core as a magnetic sheet.
  • the member 20 is disposed in a state where its main surfaces are joined to each other.
  • the antenna substrate 10 includes a base film 11 having a predetermined insulating material force, and an antenna having a copper or aluminum equivalent force formed in a spiral shape on the surface of the base film 11. It consists of an air-core coil section 12 as a coil.
  • the base film 11 is formed in a sheet shape in which a main surface serving as a communication surface is substantially rectangular. As long as this base film 11 is generally used as a base material of a printed wiring board, it can be comprised regardless of the kind. Specifically, the base film 11 is a paper phenol substrate specified by the National Electrical Manufacturers Association (NEMA) as a symbol XXP, XPC, etc., and the symbol FR-2. Paper polyester substrate, specified as FR-3, paper epoxy substrate, specified as CEM-1 !, glass paper composite Epoxy board, stipulated as CHE-3 !, glass nonwoven paper composite epoxy board, glass cloth epoxy board stipulated as G-10, stipulated as FR-4, Glass cloth epoxy substrate and!
  • NEMA National Electrical Manufacturers Association
  • a so-called rigid substrate having a predetermined conductive foil such as copper foil or aluminum on one side or both sides can be used.
  • a flexible resin film such as polyimide, PET, PEN, etc. may be used.
  • an air core coil body 12 serving as a radiation electrode is exposed and formed.
  • a spiral air core coil portion 12 wound around each side of the base film 11 is formed on the surface of the base film 11.
  • the end portion on the innermost peripheral side in the spiral air-core coil portion 12 and the end portion on the outermost peripheral side in the air-core coil portion 12 are each a connecting portion formed in a part of the base film 11. It is electrically connected to signal lines 13a and 13b provided at 1 la.
  • the antenna substrate 10 is electrically connected to an external IC chip (not shown) via the covered signal lines 13a and 13b.
  • the IC chip includes, for example, an antenna such as a tuning and smoothing capacitor, a diode bridge, a CPU (Central Processing Unit), a ROM (Read Only Memory), and an array (Electrically Erasable Programmable Read Only Memory).
  • an antenna such as a tuning and smoothing capacitor, a diode bridge, a CPU (Central Processing Unit), a ROM (Read Only Memory), and an array (Electrically Erasable Programmable Read Only Memory).
  • Various members for realizing the module function are integrated into a single semiconductor chip.
  • the base film 11 may be provided with through holes for electrically connecting the front and back surfaces. Furthermore, it is desirable that the front and back surfaces of the base film 11 are covered with an overcoat material made of a predetermined insulating material in order to protect the antenna substrate 10.
  • the magnetic core member 20 is configured as a magnetic sheet in which a plurality of flat ferrite sintered bodies 21 are spread as shown in FIG.
  • the ferrite sintered bodies 21 are arranged in a state where they are laid down so as to cover the air-core coil portion 12 and the periphery thereof in the antenna substrate 10.
  • the ferrite sintered body 21 is arranged in a grid pattern when its main surface is square.
  • the ferrite sintered body 21 may be a laminated body in which a plurality of the magnetic core members 20 are laminated in the thickness direction.
  • the powerful sintered ferrite 21 has the property of strongly magnetizing even if the magnetic field to which external force is applied is weak. Therefore, even if a metal object exists around the air-core coil portion 12, it can be absorbed without leakage of the magnetic field into the metal object.
  • each ferrite sintered body 21 will be described in detail later, it is assumed that the size is defined by research conducted by the applicant of the present application.
  • the main surface of the sintered ferrite body 21 is not limited to the shape, for example, a polygon, an ellipse, a circle, etc. can do.
  • the main surface shape of the sintered sintered body 21 is an ellipse or a circle, a gap will be generated when trying to spread the same in the same plane.
  • the ferrite sintered bodies 21 are laminated in steps so that no gap is generated, or predetermined magnetic powder is placed in the gaps between the plurality of ferrite sintered bodies 21 laid in the same plane. Just add the mixed binder.
  • a bonding agent for bonding the plurality of ferrite sintered bodies 21 to each other a double-sided tape, an adhesive such as a silicon-based adhesive or an ultraviolet curing adhesive can be used.
  • the magnetic core member 20 may be sealed with a predetermined sealant in a state where the ferrite sintered body 21 is disposed.
  • a bonding agent it is desirable to use a material having a material strength with low transmission loss of electromagnetic waves. Specifically, it is desirable to use a material having a relative dielectric constant of less than 500 and a low dielectric strength.
  • Such a ferrite sintered body 21 is cut and fired in a so-called green sheet state, but may be curved during firing due to its thin thickness. Such a curvature is undesirable because it causes a situation in which a gap generated between the ferrite sintered bodies 21 is increased and a thickness of the entire antenna module increases. Such bending also induces a problem of deteriorating communication characteristics. Therefore, it is desirable that the curvature of the ferrite sintered body 21 be less than half the thickness of the ferrite sintered body 21. Specifically, the thickness of the ferrite sintered body 21 It is more desirable to keep it below 20%.
  • the size of the main surface of the ferrite sintered body 21 becomes smaller than a predetermined value by satisfying a predetermined condition as described later. For this reason, the sintered ferrite body 21 cut and fired into a large size in the state of a green sheet is a bay. It becomes difficult to tune.
  • the antenna module including the antenna substrate 10 and the magnetic core member 20 is used as, for example, a non-contact type product identification tag or a part of a communication unit in a communication device. Or be incorporated as
  • the ferrite sintered body 21 is formed in a predetermined size as described above. That is, the ferrite sintered body 12 has a thickness of D [m], a major surface area of A [mm 2 ], a major axis length of LI [mm], and a minor axis length of L2 [mm]
  • the length of the long axis means the length of the longest portion of the straight portions that define the main surface of the ferrite sintered body 21.
  • the ferrite sintered body 21 has a square main surface, one side is less than 5 [mm] and the thickness is 50 [/ ⁇ ⁇ It is realistic to use those that are above 550 [/ ⁇ ⁇ ].
  • the lower limit value of the thickness is set to 50 [m] because the limit value at which the magnetic property of the ferrite sintered body 21 can be exhibited in terms of the communication distance is 50 [m].
  • the upper limit of the thickness is set to 550 [/ ⁇ ⁇ ] in order to meet the demand for thinner antenna modules.
  • the antenna module including the magnetic core member 20 using the ferrite sintered body 21 can be used as, for example, a non-contact type product identification tag.
  • predetermined identification data relating to the product as an attached body is recorded on the IC chip connected to the antenna module.
  • the antenna module is attached to a product to be identified through a pressure-sensitive adhesive film or the like interposed on the surface of the ferrite sintered body 21 side.
  • the antenna module is recorded on the IC chip in response to receiving communication radio waves transmitted from the reader Z writer, not shown, during the distribution process and inventory management of the product. The corresponding information is read out and sent to the reader Z writer.
  • the antenna module attached to the product in this way since the ferrite sintered body 21 is interposed between the product and the air-core coil portion 12, the surface to be attached of the product is made of a metal material. Even if it is comprised, the fall of an inductance can be prevented. As a result, the antenna module can generate a predetermined induced voltage by the air-core coil section 12, and by applying this induced voltage to the IC chip, the reader Z writer can reliably read the identification data. be able to.
  • the powerful antenna module can also be incorporated in a communication device as an attached body.
  • the communication equipment here refers to mobile phones and personal digital assistants (personal digital assistants) that have built-in communication units that read and write to IC recording media such as IC cards and IC tags.
  • a portable wireless communication terminal such as PDA
  • the antenna module is incorporated in a communication device as a part of the communication unit.
  • the antenna module is laminated in the order of the antenna substrate 10, the magnetic core member 20, and the metal shield plate 30, and is arranged with its main surfaces bonded to each other.
  • the metal shield plate 30 is also made of aluminum, copper, iron, stainless steel, magnesium alloy, etc., and is opposite to the main surface of the magnetic core member 20 joined to the antenna substrate 10 via a double-sided tape or the like. It is joined to the main surface.
  • Such an antenna module is laid with a plurality of flat ferrite sintered bodies 21 so as to cover the air core coil portion 12 mounted on the antenna substrates 10, 10 ', and if necessary, A plurality of ferrite sintered bodies 21 are laminated in the thickness direction via a predetermined bonding agent, and ferrite It can be manufactured by joining a predetermined metal shield plate 30 to the sintered body 21.
  • the antenna module has a shield plate 30 on the side opposite to the antenna substrate 10 that serves as a communication surface as an attachment surface, and is attached to the surface on the shield plate 30 side. It is attached to a predetermined attachment 40 formed on the communication device via a pressure-sensitive adhesive film.
  • the shield plate 30 can prevent radio waves generated during operation of the antenna coil from entering the communication device, thereby preventing malfunction of the communication device. it can.
  • the metal part 41 such as a casing part or a wiring part of a communication device is usually provided around and on the upper surface of the attachment part 40. That is, the antenna module is often incorporated into a communication device in a state surrounded by a powerful metal object 41.
  • the antenna module even if there is a metal object 41 between the communication device mounting portion 40, the communication radio wave radiated toward the air-core coil portion 12 is transmitted to the ferrite sintered body. Since it can be absorbed by 21, the leakage of the magnetic field to the metal object 41 side can be suppressed. Therefore, in the antenna module, generation of eddy current due to the leakage magnetic field in the metal object 41 can be suppressed, and deterioration of communication characteristics can be prevented.
  • the shield plate 30 even if the amount and arrangement of the metal object 41 in the mounting part 40 of the communication device are different, it is possible to eliminate the influence of the antenna coil. And stable communication characteristics can be secured. That is, in the antenna module, by providing the shield plate 30, it becomes possible to exhibit desired communication characteristics regardless of the installation environment of the antenna coil.
  • the applicant of the present application actually configured the antenna module, attached it to a commercially available mobile phone (S O506ic; manufactured by Soichi 'Ericsson Mopile Communications Co., Ltd.), performed a drop test, and sintered the ferrite at that time. In addition to examining the condition of the body, we also measured the communication characteristics.
  • a mobile phone 60 with an antenna module 50 attached thereto The mobile phone 60 is in a vertical state so that the side on which the antenna module 50 is provided is the lower side, and the upper side of the mobile phone 60 on which the antenna module 50 is not provided is a predetermined clip.
  • the state fixed using 70 was defined as the initial state before dropping.
  • the mobile phone 60 is naturally dropped five times from a height of 150 cm, and then the mobile phone 60 is disassembled and the antenna module 50 is taken out to check the state of the fluorescent sintered body.
  • the sintered body is classified into three types: when it is not cracked, when it is cracked and missing, and when it is cracked and damaged, and the evaluations are “ ⁇ ”, “ ⁇ ⁇ ”, and “ ⁇ ” respectively.
  • a hard plastic with a thickness of 2 mm and a hardness of 98 or more (Type D durometer) was laid on the upper layer of the concrete floor.
  • the main surface is a square of 1.2 [mm] X 1.2 [mm] and the thickness is 130 [/ ⁇ m]
  • the main surface is 3 [mm] X 3 [mm] square with a thickness of 300 [m]
  • main surface 1.4 [mm] XI .4 [mm] square Four types were prepared: one with a thickness of 190 [m], one with a square of 2 [mm] x 2 [mm] and a thickness of 400 [m].
  • the main surface is a square of 5 [mm] X 5 [mm] and the thickness is 130 [/ ⁇ ⁇ ], and the main surface is 10 [mm] X 10 [mm
  • a double-sided tape or a silicon-based adhesive was prepared as a bonding agent for bonding a plurality of sintered ferrite bodies to each other. The results are shown in the following Tables 1 to 3.
  • Example 2 Furthermore, as a result of measuring the change in the communication distance when the ferrite sintered body used in Example 1 was stacked, as shown in Table 2 above, as the number of layers increased, the inductance increased and the Q value also increased. As a result of the increase, the communication distance was increased.
  • the antenna module shown as the embodiment of the present invention has a ferrite sintered body that is a brittle material by specifying the size of the ferrite sintered body. , Rigidity can be realized, and excellent communication characteristics can be realized.
  • the present invention is not limited to the above-described embodiment.
  • the power described as the antenna module is a type that is electrically connected to an external IC chip.
  • the present invention can also be applied to a type in which an IC chip is mounted on an antenna substrate. it can.
  • the antenna module may include an IC chip 15 as shown in a plan view in FIG. 7 (a) and a side view in FIG. 7 (b). That is, in such an antenna module, a core material that also has, for example, urethane resin is provided on a part of the main surface of the base film 11 that constitutes the antenna substrate 10 ′ that is to be attached to the magnetic core member 20. Thus, an IC chip mounting surface is formed, and the IC chip 15 mounted on the IC chip mounting surface is electrically connected to both end portions of the air-core coil unit 12.
  • Such an antenna module can also be used for a contactless product identification tag or a communication unit in a communication device.
  • an antenna substrate 10 ′, a magnetic core member 20, and a metal shield plate 30 are laminated in this order, and their main surfaces are mutually stacked. Are arranged in a joined state.
  • the antenna module has the shield plate 30 side opposite to the antenna substrate 10 ′ serving as the communication surface as the adherend surface, and is interposed on the shield plate 30 side surface. It is attached to a predetermined attachment part 40 formed on the communication device through the pressure-sensitive adhesive film or the like.
  • the IC chip mounting portion may be provided on the antenna substrate 10 on the communication surface side.
  • the IC chip mounting portion can be placed at an arbitrary position depending on the shape of the air core coil portion 12 that does not need to be formed in the innermost peripheral region of the air core coil portion 12. It can also be formed.
  • the power described for the antenna module used as an IC card or IC tag is not limited to the shape as a powerful IC card or IC tag, and other configurations depending on the application. It can be applied to various shapes.

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Abstract

La présente invention concerne un dispositif d'antenne qui peut faire preuve d'une rigidité élevée tout en utilisant un aggloméré de ferrite fragile ; il possède aussi d'excellentes propriétés de communication. Dans ce dispositif d'antenne, un module d'antenne comprend un membre de cœur magnétique (20) qui se compose d'une pluralité d'agglomérés de ferrite de forme plate (21) répartis de manière à couvrir une bobine d'antenne montée sur un substrat d'antenne. L'aggloméré de ferrite (21) fait l'objet de conditions de taille de 2 < D/A, 0 < L1 < 5 × 21/2 et 1 ≤ L1/L2 ≤ 2 sachant que D représente l'épaisseur de l'aggloméré de ferrite (21), µm ; A représente la zone d'un plan principal, mm2 ; L1 représente la longueur d'un axe principal, mm ; et L2 représente la longueur de l'axe mineur, mm.
PCT/JP2007/058232 2006-08-07 2007-04-16 Feuille magnétique, dispositif d'antenne et procédé de fabrication de dispositif d'antenne Ceased WO2008018211A1 (fr)

Applications Claiming Priority (2)

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JP2006-214218 2006-08-07
JP2006214218A JP2008042519A (ja) 2006-08-07 2006-08-07 磁性シート、並びにアンテナ装置及びアンテナ装置の製造方法

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WO2008018211A1 true WO2008018211A1 (fr) 2008-02-14

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JP5487919B2 (ja) * 2009-12-01 2014-05-14 株式会社村田製作所 磁性体アンテナ及び携帯端末
JP5500648B2 (ja) * 2010-09-29 2014-05-21 埼玉日本電気株式会社 Ｒｆｉｄ用アンテナ、およびそれを備えた電子機器、それに用いるチップフェライト部品
TWI506854B (zh) * 2011-09-28 2015-11-01 Hon Hai Prec Ind Co Ltd 天線及其製造方法
JP6622649B2 (ja) * 2015-12-21 2019-12-18 ホシデン株式会社 非接触通信モジュール
TWI722953B (zh) * 2020-08-07 2021-03-21 鴻驊科技股份有限公司 微型化近場通訊系統及其近場通訊裝置與穿戴式裝置

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JPH0746164A (ja) * 1993-07-26 1995-02-14 Tokin Corp 磁気通信装置
JP2002290131A (ja) * 2000-12-18 2002-10-04 Mitsubishi Materials Corp トランスポンダ用アンテナ
JP2005080023A (ja) * 2003-09-01 2005-03-24 Sony Corp 磁芯部材、アンテナモジュール及びこれを備えた携帯型通信端末
JP2005269599A (ja) * 2004-02-18 2005-09-29 Sony Corp アンテナモジュール用磁芯部材およびその製造方法
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