EP1815558B1 - Feuille magnetique, appareil d'antenne l'utilisant et procede de production d'une feuille magnetique - Google Patents

Feuille magnetique, appareil d'antenne l'utilisant et procede de production d'une feuille magnetique Download PDF

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Publication number
EP1815558B1
EP1815558B1 EP05790142.3A EP05790142A EP1815558B1 EP 1815558 B1 EP1815558 B1 EP 1815558B1 EP 05790142 A EP05790142 A EP 05790142A EP 1815558 B1 EP1815558 B1 EP 1815558B1
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EP
European Patent Office
Prior art keywords
magnetic
aforementioned
antenna
sheet
antenna apparatus
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.)
Active
Application number
EP05790142.3A
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German (de)
English (en)
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EP1815558A1 (fr
Inventor
Hidetsugu c/o Matsushita Electric Industrial Co. Ltd FUJIMOTO
Kouji c/o Matsushita Electric Industrial Co. Ltd NISHIMURA
Hatsuhiro c/o Matsushita Electric Industrial Co. Ltd YANO
Kouichi c/o Matsushita Electric Industrial Co. Ltd WATANABE
Koji c/o Matsushita Electric Industrial Co. Ltd YASUMURA
Keisuke c/o Matsushita Electric Industrial Co. Ltd MARUYAMA
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Panasonic Corp
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Panasonic Corp
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Publication date
Priority claimed from JP2004283886A external-priority patent/JP2006101109A/ja
Priority claimed from JP2004287050A external-priority patent/JP2006101370A/ja
Priority claimed from JP2004365726A external-priority patent/JP4869587B2/ja
Priority claimed from JP2004365716A external-priority patent/JP4218635B2/ja
Application filed by Panasonic Corp filed Critical Panasonic Corp
Publication of EP1815558A1 publication Critical patent/EP1815558A1/fr
Application granted granted Critical
Publication of EP1815558B1 publication Critical patent/EP1815558B1/fr
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    • 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

Definitions

  • the present invention relates to a magnetic sheet which can be preferably used for magnetic shield such as RF-ID antenna, etc., and an antenna apparatus comprising same, and a method of producing a magnetic sheet.
  • wireless communications apparatus such as cellular phone
  • wireless communications apparatus such as cellular phone
  • more portable mobile electronic apparatus such as notebook personal computer have employed data communications using wireless LAN, etc., and it has been desired to reduce the size of these parts to be incorporated in these electronic apparatus arid raise the mounting density thereof.
  • Fig. 10 and 11 each are a sectional view of a magnetic sheet according to the conventional technique and Fig. 12 is a plan view of a magnetic layer according to the conventional technique.
  • the conventional magnetic sheets were disadvantageous in that workability or mountability is focused for convenience of post mounting and the constitution of the magnetic sheet is almost entirely occupied by a sheet substrate 3 which is desired to have physical properties such as flexibility as shown in Figs. 10 and 11 , making it impossible to sufficiently exhibit magnetic properties.
  • the magnetic sheet 6 shown in section in Fig. 10 comprises regularly shaped or amorphous magnetic particles 1a dispersed in a sheet substrate 3.
  • the enhancement of magnetic properties by this arrangement can be realized by increasing the content of the magnetic particles 1a in the magnetic sheet substrate 6.
  • this method was disadvantageous in that the rise of the content of the magnetic particles 1a causes the impairment of physical properties such as flexibility of the sheet substrate 3 or makes it difficult for the magnetic particles 1a to disperse and hence causes the deviation of condensed density of the magnetic particles 1a, raising problems of damages such as formation of pores and cracking, deterioration of mechanical strength or weathering resistance, etc. and hence making it impossible to sufficiently raise the content of the magnetic particles 1a and hence the magnetic properties.
  • the magnetic material in the sheet substrate 3 is in the form of leaf 1b, and these magnetic leaves 1b are superimposed on each other or disposed in close contact with each other so that they are spread in the planar direction with little gap to raise the surface density of the magnetic layer 2b and enhance the magnetic function. Further, since this thin magnetic layer 2b is provided interposed between the sheet substrate 3, the physical properties of the sheet substrate 3 can be little impaired while enhancing the magnetic function.
  • the magnetic sheet 6 shown in section in Fig. 11 comprises magnetic leaves 1b assembled in lamellar form, making it possible to exhibit high magnetic properties with a reduced content of magnetic material in the sheet substrate 3.
  • the magnetic sheet 6 of Fig. 10 was disadvantageous in that in order to enhance the magnetic properties, the amount of the magnetic layer 2b formed by the magnetic leaves 1b must be raised, impairing physical properties such as flexibility of the sheet substrate 3 or deteriorating mechanical strength or weathering resistance. Therefore, the content of magnetic leaves 1b cannot be sufficiently raised, making it impossible to enhance the magnetic properties.
  • An object of the present invention is to provide an antenna apparatus including a magnetic sheet arranged to exhibit the maximum magnetic properties while maintaining the least required physical properties as magnetic sheet.
  • the present invention provides for an antenna apparatus as defined in claim 1.
  • the invention provides for a method of producing an antenna apparatus is defined in claim 1.
  • Figs. 1 , 2 , 3 , 4 , 5 and 6 each are a sectional view of a magnetic sheet according to an embodiment.
  • Figs. 7 , 8 and 9 each are a perspective view of a magnetic layer according to an embodiment.
  • Fig. 1 depicts a magnetic sheet 6, and in Fig. 1 , the reference numeral 1 indicates a magnetic block, the reference numeral 2 indicates a magnetic layer, and the reference numeral 3 indicates a sheet substrate. Further, the reference numerals 4a, 4b indicate the upper and lower surfaces of the magnetic layer 2, respectively.
  • the magnetic layer 2 itself is not lamellar but is expressed as a magnetic layer to indicate the magnetic range between the upper and lower surfaces 7a, 7b of the magnetic sheet 6.
  • the magnetic block 1 is a single solid piece formed by any one of magnetic powders such as ferrite, permaloy, sendust and silicon plywood. Since all these magnetic blocks 1 are arranged to form the upper and lower surfaces 4a, 4b of the magnetic layer 2 at the same time, the maximum volume of the magnetic block 1 can be used within the range of thickness dimension, mechanical strength and other physical properties required for a magnetic sheet 6 and the specific surface area of the magnetic block 1 in the entire magnetic layer 2 can be reduced to reduce the amount of the sheet substrate 3, making it possible to obtain high magnetic properties.
  • the magnetic blocks 1 are arranged to have substantially the same shape so that the various magnetic blocks 1 and the clearances 5 between the magnetic blocks can be orderly arranged, making it easy to design properties such as magnetic properties and insulation properties, physical properties such as bending and deflection and workability in cutting, etc.,
  • a part or a plurality of parts of the magnetic layer 2 are formed by an assembly of magnetic blocks 1c having substantially the same shape with which an assembly of magnetic blocks 1d, 1e having different shapes is combined, making it possible to enhance the degree of freedom of the standard shape, type of dimension, etc. of the magnetic sheet 6.
  • the working frequency band is 13.56 MHz.
  • RFID Radio Frequency Identification
  • the magnetic sheet can be mounted even in an uneven place while assuring the desired wireless range.
  • the magnetic sheet is suitable particularly for the case where the mounting space is limited as in cellular phone.
  • the individual magnetic block 1 is shown in the form of prism or column by way of representative example for ease of molding but may be in the form of trigonal prism, polygonal prism, pyramid, cone, sphere or needle. Alternatively, amorphous magnetic blocks 1 may be provided to reduce the number of steps of working the magnetic block 1.
  • Figs. 1 to 5 examples of the configuration of the magnetic block 1 and the sheet substrate 3 are depicted.
  • the magnetic block 1 is shown embedded in the sheet substrate 3.
  • the magnetic layer 2 is formed by a single layer and the thickness of the magnetic block 1 is maximized, making it possible to drastically reduce the amount of the sheet substrate 3, and further, in Fig. 2 , the magnetic block 1 is shown retained by the sheet substrate 3 on the upper and lower surfaces 4a, 4b of the magnetic layer 2.
  • the clearance 5 is formed on the side of the magnetic block 1, making it possible to not only further reduce the amount of the sheet substrate 3 but also cause the clearance 5 to act as a buffer layer and thus exhibit stable properties without giving any stress-strain to the magnetic block 1 even if a load such as bending and deflection is applied to the magnetic sheet substrate 6.
  • the sheet substrate 3 is shown excluded on the upper and lower surfaces 4a, 4b of the magnetic layer 2 and provided only on the side of the magnetic block 1.
  • the upper and lower surfaces 4a, 4b of the magnetic layer 2 are disposed flush with the upper and lower surfaces 7a, 7b of the magnetic sheet 6, respectively. Accordingly, the magnetic block 1 is exposed at the upper and lower surfaces 7a, 7b of the magnetic sheet substrate 6, and it is thus effective in the case where the magnetic properties of the magnetic block 1 are directly utilized.
  • Fig. 4 depicts a configuration that one surface 7a of the magnetic sheet substrate 6 is flush with one surface 4a of the magnetic layer 2.
  • a configuration is depicted that the magnetic block 1 is retained by the sheet substrate 3 only on one surface 4b of the magnetic layer 2.
  • a single magnetic layer 2 is provided between the upper and lower surfaces 7a, 7b of the magnetic sheet, the magnetic sheet layer 2 is formed by a plurality of magnetic blocks 1 having different shapes and all the solid pieces of magnetic block 1 are arranged to form the upper and lower surfaces 4a, 4b of the magnetic layer 2 at the same time, making it possible to retain the magnetic block 1 by the sheet substrate 3 only on one surface 4b of the magnetic layer 2.
  • the sheet substrate 3 there is preferably used a resin or rubber, but selection may be conducted taking into account not only flexibility to bending or deflection but also weathering resistance such as heat resistance and moisture resistance.
  • Fig. 13 is a perspective view illustrating an antenna apparatus according to Embodiment 2.
  • an antenna apparatus 30A comprises an antenna pattern 2, a matching circuit 3, a sheet substrate 4 and a magnetic block 10.
  • the plurality of magnetic blocks 10 are arranged planarly to form a magnetic layer 9 and the sheet substrate retains the magnetic layer 9.
  • the magnetic sheet substrate 1 incorporated in the antenna apparatus 30A is an antenna-integrated magnetic sheet substrate, and the magnetic layer of the magnetic block 10 and the antenna pattern 2 are retained covered by the sheet substrate 4 to form an integrated structure.
  • the antenna apparatus 30A When the antenna apparatus 30A is thus arranged, the antenna apparatus 30A can be reduced in its thickness and weight and can be provided with high magnetic properties, making it possible to enhance the wireless properties of RFID. Further, since the antenna pattern 2 is covered by the sheet substrate 4, the denaturatiion or corrosion of the surface of the antenna pattern can be prevented. Moreover, troubles such as deformation or separation of antenna pattern 2 due to external stress can be prevented.
  • Fig. 14 is a perspective view illustrating the magnetic layer of the magnetic block 10 in Embodiment 2, and in Fig. 14 , the reference numeral 9 indicates a magnetic layer.
  • magnetic materials can be formed at a high density in the antenna apparatus 30A, making it possible to obtain high magnetic properties and easily design the bending, deflection, etc. of the antenna apparatus 30A and facilitate cutting at the subsequent step.
  • Fig. 15 is an exploded perspective view illustrating an antenna apparatus according to Embodiment 2.
  • the reference numeral 5 indicates an upper housing
  • the reference numeral 6 indicates a metal sheet
  • the reference numeral 7 indicates a lower housing.
  • the antenna apparatus 30B comprises a magnetic sheet and a metal sheet 6 provided interposed between the upper housing 5 and the lower housing 7.
  • the antenna apparatus 30A has an integrated structure comprising the magnetic layer 9 of the magnetic block 10 and the antenna pattern 2 retained covered by the sheet substrate 4, making it possible to maximize the magnetic properties thereof while maintaining the least required physical properties of the antenna apparatus 30A and hence enhance the wireless properties of the antenna apparatus 40. Further, when the impedance of the antenna is adjusted with the metal sheet 6 attached thereto, the effect of metal around the installation place can be eliminated. In some detail, no change of impedance of antenna or deviation (change) of resonance frequency due to the effect of metal around the installation place can occur, eliminating the necessity of adjusting resonance frequency.
  • the wireless properties of RFID can be fully satisfied without deteriorating the antenna properties.
  • the antenna apparatus 30B according to Embodiment 2 can be used as antenna apparatus according to Embodiment 2, as shown in Fig. 15 but also as antenna apparatus shown in Fig. 24 and can provide high magnetic properties.
  • the antenna apparatus according to Embodiment 2 can be reduced in its dimension in the thickness direction and thickness to reduce the number of parts and the weight thereof.
  • Fig. 16 is a sectional view illustrating a magnetic sheet according to Embodiment 2.
  • a sheet substrate 4 is packed in the adjacent magnetic blocks 10, making it possible to enhance the retaining strength of the magnetic block 10 and provide a flexible antenna apparatus 30A and hence arbitrarily cope with bending or deflection and facilitate cutting.
  • Figs. 17 to 23 each are a sectional view illustrating other examples of the magnetic sheet according to Embodiment 2.
  • a clearance 8 is formed between the adjacent magnetic blocks 10, making it possible to provide a flexible antenna apparatus 30A and hence arbitrarily cope with bending or deflection and facilitate cutting.
  • the adjacent magnetic blocks 10 are arranged to come in contact with each other, making it possible to raise the volume of the magnetic block 10 with respect to the entire antenna apparatus 30A and hence obtain high magnetic properties.
  • the magnetic block 10 is formed by a number of magnetic layers 9 and the magnetic layers 9 are bonded to each other with a sheet substrate 4, making it easy to predetermine optimum magnetic properties by predetermining the number of magnetic layers 9 to be laminated.
  • a sheet substrate 4 is formed on the side of the magnetic layer 9 of the plurality of magnetic blocks 10, rendering the side of the magnetic block 10 (magnetic layer 9) resistant to the external stress or impact and hence making it possible to prevent the occurrence of cracking or breaking of the magnetic block 10 and prevent the exfoliation of the magnetic block 10 and the sheet substrate 4 from each other. Moreover, the penetration of water content, etc. from side can be prevented to enhance reliability.
  • an adhesive sheet 12 such as double-bonded tape, for example, is provided on the sheet substrate 4 of the magnetic block 10 retained by the sheet substrate 4, an antenna pattern 2 is formed on this adhesive sheet 12 and the sheet substrate 4 is disposed on the antenna pattern 2, making it possible to efficiently connect the antenna apparatus 30A comprising the magnetic blocks 10 and the antenna pattern 2 to each other.
  • the adhesive sheet 12 is formed on the sheet substrate 4 of the plurality of magnetic blocks 10 retained by the sheet substrate 4 and the antenna pattern 2 embedded in the sheet substrate 4 is fixed by the adhesive sheet 12, making it possible to efficiently connect the antenna apparatus 30A comprising the magnetic blocks 10 and the sheet substrate 4 comprising the antenna pattern 2 to each other. Moreover, since the antenna pattern 2 is fixed by embedding, no damage, deformation or positional deviation of the antenna pattern 2 during assembly can occur, making it possible to form the antenna pattern 2 with a good precision and hence obtain stable wireless properties in RFID system.
  • the antenna pattern 2 is formed on the upper part of the magnetic blocks 10, making it possible to reduce the total thickness of the antenna apparatus 30A.
  • the magnetic sheet comprises at least an assembly of a plurality of magnetic blocks 10, a sheet substrate 4 retaining or supporting the assembly 9 and an antenna pattern 2.
  • the magnetic sheet may be provided free of antenna pattern 2, and, in this case, this magnetic sheet comprises at least an assembly 9 of a plurality of magnetic blocks 10 and a sheet substrate 4 retaining or supporting the assembly 9.
  • the magnetic blocks 10 of this magnetic sheet may be made of a ferrite- based material and other metallic magnetic sheets may be laminated on this ferrite magnetic sheet.
  • the antenna pattern 2 has a loop antenna structure.
  • the loop antenna may be a loop having an opening provided in the center thereof and may be in the form of circle, substantial circle or polygon.
  • the material of the loop antenna may be properly selected from the group consisting of electrically-conductive metal wire, metallic sheet, metallic foil, metallic cylinder, etc.
  • the loop antenna may be formed by metal wire, metal foil, electrically-conductive paste, transfer of deposit, sputtering, vacuum deposition or screen printing.
  • the antenna properties can be difficultly affected by metal present around the installation place or other factors and the occurrence of stationary wave due to nonmatching can be inhibited, making it possible to provide an antenna having stable operation and reduced loss.
  • the sheet substrate 4 there is preferably used, e.g., resin or rubber. Selection may be conducted taking into account not only flexibility to bending or deflection but also weathering resistance such as heat resistance and moisture resistance.
  • the sheet substrate 4 may retain the plurality of magnetic blocks 10 with a resin sheet or include the plurality of magnetic blocks 10 with a resin material to form a sheet, and its form is not limited.
  • the sheet substrate 4 may be a laminate or molded material.
  • the upper housing 5 and the lower housing 7 may be made of a resin material, making it possible to reduce the weight of the antenna apparatus.
  • the metal sheet 6 is preferably made of a nonmagnetic material such as aluminum sheet.
  • the magnetic layer 9 is an assembly of magnetic blocks 10 which can be orderly arranged to form a magnetic material efficiently with respect to the total thickness of the magnetic sheet 30.
  • the magnetic block 10 is formed by a metallic magnetic material such as ferrite-based material, permaloy, sendust and silicon plywood.
  • a metallic magnetic material such as ferrite-based material, permaloy, sendust and silicon plywood.
  • the material constituting the magnetic block 10 may be made of a soft magnetic ferrite, even a high density baked ferrite obtained by dry-pressing a ferrite-based magnetic powder which is a soft magnetic ferrite and then baking the ferrite-based magnetic powder thus pressed, and the density of the soft magnetic ferrite is preferably 3.5 g/cm 3 or more. Further, the size of the soft magnetic ferrite-based magnetic powder is preferably not smaller than the grain boundary.
  • the soft magnetic ferrite examples include Ni-Zn-based ferrites and Mn-Zn-based ferrites, and the soft magnetic ferrite may be made of Fe 2 O 3 , ZnO, NiO and CuO or Fe 2 O 3 , ZnO, MnO and CuO.
  • the magnetic block 10 may be a magnetic block made of any of amorphous alloy, permaloy, magnetic steel, silicon steel, Fe-Al alloy and sendust alloy or may be a laminate of amorphous foil, permaloy, electromagnetic steel, silicon steel or sendust. Further, the magnetic block 10 may be in the form of substantially trigonal column, substantially rectangular column, substantially polygonal column, substantially circular column, substantial sphere or the like.
  • the adhesive sheet 12 there may be used a double-sided tape or the like.
  • a sticking agent or adhesive may be used instead of the adhesive sheet 12.
  • a magnetic sheet 30 having excellent properties can be provided, and the antenna apparatus 40 can exhibit stable properties of RFID system to assure desired wireless range. While the aforementioned embodiment has bee described with reference to the magnetic sheet shown in Fig. 15 as an example of magnetic sheet, the magnetic sheet is not limited to the magnetic sheet shown in Fig. 15 .
  • the magnetic material was composed of from 46.0 to 50.0 mol-% of Fe 2 O 3 , from 18.0 to 22.5 mol-% ofNiO, from 18.0 to 22.5 mol-% of ZnO and from 8.5 to 12.0 mol-% of CuO.
  • the magnetic material thus compounded was subjected to mixing/grinding (5 to 20 hours), dried, ground, and then calcinated in a baking furnace (600°C to 1,000°C).
  • the magnetic powder thus calcinated was granulated with a polyvinyl-based binder, molded into a block form to prepare predetermined solid pieces (magnetic block 10), and then baked in a baking furnace (800°C to 1,200°C).
  • the thickness of the magnetic block 10 thus prepared is 0.25 mm, but an optimum dimension of 0.03 m or more can be arbitrarily selected depending on the requirements for installation form.
  • the shape of the magnetic block 10 was a 2 mm square.
  • the baked density of the magnetic block 10 was 5.1 g/cm 3 .
  • the magnetic block 10 thus completed was laid on the sheet substrate, bonded and fixed to the sheet substrate, and then laminated with other sheet substrates and antenna patterns on the top thereof to obtain a magnetic sheet 30.
  • the magnetic block 10 which has been baked to a high density is laid on the sheet substrate, a magnetic material having a high permeability can be prepared, making it possible to enhance the wireless range of RFID.
  • Examples of the method of forming the magnetic block 10 include a method which comprises cutting the magnetic block baked into a magnetic block 10, and a method which comprises cutting a baked material prepared by doctor blade into solid pieces, and any of these methods may be selected.
  • the reference numeral 1 indicates an antenna apparatus shown illustrating the internal structure of RFID system
  • the reference numeral 2 indicates a resin case (main body)
  • the reference numeral 3 indicates an antenna pattern formed on the antenna substrate
  • the reference numeral 4 indicates a matching circuit
  • the reference numeral 5 indicates a soft magnetic material
  • the reference numeral 6 indicates a resin spacer
  • the reference numeral 7 indicates a metal sheet
  • the reference numeral 8 indicates a resin case (back cover).
  • Fig. 28(a) depicts an exploded perspective view of an antenna apparatus according to the present embodiment.
  • Disposed under the antenna substrate having the antenna pattern 3 and the matching circuit 4 formed thereon is the soft magnetic material 5.
  • Disposed under the soft magnetic material 5 are the resin spacer 6 and the metal sheet 7. The aforementioned parts are received in the resin case (main body) 2 and the resin case (back cover) 8.
  • the soft magnetic material 5 is formed by an assembly of a plurality of magnetic blocks, making it possible to enhance productivity and prepare a soft magnetic material having an excellent quality and little dispersion of properties.
  • Fig. 28(b) depicts a plan view of the soft magnetic material according to the present embodiment.
  • Fig. 28(c) depicts a side view of the soft magnetic material according to the present embodiment.
  • Fig. 28(d) depicts a perspective view of the soft magnetic material according to the present embodiment.
  • the reference numeral 9 indicates a magnetic block in the soft magnetic material 5.
  • Fig. 29(a) is a plan view of the soft magnetic material according to the present embodiment.
  • Fig. 29(b) depicts a side view of the soft magnetic material according to the present embodiment.
  • Fig. 29(c) depicts a perspective view of the soft magnetic material according to the present embodiment of implementation of the present invention.
  • an effect can be exerted of reducing the weight of the soft magnetic material and assure desired wireless range while inhibiting the change of resonance frequency or the rise of loss due to eddy current generated in the metal present on the back of RIFD system.
  • Fig. 30(a) is a plan view of the soft magnetic material according to the present embodiment.
  • Fig. 30(b) depicts a side view of the soft magnetic material according to the present embodiment.
  • Fig. 30(c) depicts a perspective view of the soft magnetic material according to the present embodiment.
  • a flexible soft magnetic material resistant to impact can be prepared.
  • Fig. 31 (a) is a plan view of the soft magnetic material according to the present embodiment. In this arrangement, any thickness can be coped with, making it easy to adjust the intensity of magnetic field.
  • Fig. 32(a) depicts a plan view of the soft magnetic material according to the present embodiment.
  • a variety of magnetic blocks can be used, making it possible to prepare a magnetic material at a high productivity and a reduced cost.
  • Fig. 33(a) depicts a plan view of the soft magnetic material according to the present embodiment.
  • the intensity of magnetic field at the end of RFID can be raised, making it possible to eliminate skip zones during communication.
  • the reference numeral 1 indicates an antenna apparatus shown illustrating the internal structure of RFID system which comprises a resin case (main body) 2, an antenna pattern 3 formed on the antenna substrate, a matching circuit 4, a soft magnetic material 5, resin spacer 6, a metal sheet 7 and a resin case (back cover) 8 as shown in Fig. 28 .
  • the reference numeral 3 is an antenna pattern having a loop antenna structure.
  • the loop antenna may be a loop having an opening provided in the center thereof and may be in the form of circle, substantial circle or polygon.
  • the material of the loop antenna may be properly selected from the group consisting of electrically-conductive metal wire, metallic sheet, metallic foil, metallic cylinder, etc.
  • the reference numeral 4 indicates a matching circuit, and the connection of the matching circuit 4 makes it less likely that the antenna properties can be affected by metal present around the installation place and can prevent the occurrence of stationary wave due to nonmatching, making it possible to provide an antenna having stable operation and little loss.
  • the reference numeral 5 indicates a soft magnetic material
  • the soft magnetic material 5 is disposed on the back surface of the antenna pattern 3, and as the material thereof there may be used a soft magnetic ferrite, amorphous alloy, permaloy, electromagnetic steel, silicon steel, Fe-Al alloy, sendust alloy or the like.
  • a tabular or sheet-like soft magnetic material may be used.
  • the sheet-like ferrite may be prepared by kneading a ferrite powder with an organic binder such as resin material, and then drying the mixture. The use of the magnetic sheet makes it possible to assure flexibility and enhance impact resistance or durability.
  • the reference numeral 9 indicates a magnetic block which is a constituent member of the soft magnetic material 5.
  • the constitution of the soft magnetic material 5 by an assembly of magnetic blocks 9 makes it possible to exert an effect of enhancing the productivity of the soft magnetic material 5, provide an excellent quality and reduce the dispersion of magnetic properties.
  • the reference numeral 10 indicates a soft magnetic material according to another embodiment of implementation of the present invention.
  • the soft magnetic material 10 is formed by an assembly of magnetic blocks 9 and has a through-hole 11 formed in the center thereof In this arrangement, the productivity of the soft magnetic material 10 can be enhanced, an excellent quality can be provided, the dispersion of magnetic properties can be reduced, and the reduction of weight can be realized.
  • the reference numeral 12 indicates a soft magnetic material according to other embodiment.
  • the soft magnetic material 12 is formed by an assembly of magnetic blocks 14 and the magnetic block 14 is a magnetic sheet comprising a laminate of sheets.
  • the reference numeral 15 indicates a soft magnetic material according to a further embodiment.
  • the soft magnetic material 15 is formed by an assembly of magnetic blocks 16 and the magnetic block 16 is a vertical laminate of two layers of magnetic bulk material. In this arrangement, any thickness can be coped with, making it easy to adjust the intensity of magnetic field.
  • the reference numeral 17 indicates a soft magnetic material according to a further embodiment.
  • the soft magnetic material 17 is formed by an assembly of magnetic block pieces 18 and the magnetic block 18 is in a trigonal column. In this arrangement, a variety of magnetic blocks can be used, making it possible to prepare a magnetic material at a high productivity and a reduced cost.
  • the reference numeral 19 indicates a soft magnetic material according to a further embodiment.
  • the soft magnetic material 19 is formed by an assembly of ferrite bulk materials 21 in the center thereof and an assembly of magnetic ferrite sheets 20 in the periphery thereof. In this arrangement, the intensity of magnetic field at the end of RFID can be raised, making it possible to eliminate skip zones during communication.
  • the reference numeral 6 indicates a resin spacer disposed under the soft magnetic material 5 and as the material of the resin spacer there may be selected a resin or the like, making it possible to attain the reduction of weight.
  • the reference numeral 7 indicates a metal sheet and as the material of the metal sheet there is preferably used a nonmagnetic material such as aluminum sheet.
  • the reference numeral 2 indicates a resin case (main body) and the reference numeral 8 indicates a resin case (back cover).
  • the resin case (main body) 2 and the resin case (back cover) 8 are arranged to interpose parts such as antenna substrate and magnetic material, raising the ease of assembly during preparation and the dimensional precision of positioning and assembly of various elements and hence making it possible to eliminate the dispersion of properties.
  • the productivity of the soft magnetic material 5 can be raised to provide a soft magnetic material having an excellent quality and little dispersion of properties, making it possible to obtain stable properties of RFID system and assure desired wireless range.
  • the reference numeral 1 indicates an antenna apparatus shown illustrating the internal structure of RFID system
  • the reference numeral 2 indicates a resin case (main body)
  • the reference numeral 3 indicates an antenna pattern formed on the antenna substrate
  • the reference numeral 4 indicates a matching circuit
  • the reference numeral 5 indicates a soft magnetic material
  • the reference numeral 6 indicates a resin spacer
  • the reference numeral 7 indicates a metal sheet
  • the reference numeral 8 indicates a resin case (back cover).
  • Fig. 34(a) depicts an exploded perspective view of an antenna apparatus according to the present embodiment. Disposed under the antenna substrate having the antenna pattern 3 and the matching circuit 4 formed thereon is the soft magnetic material 5. Disposed under the soft magnetic material 5 are the resin spacer 6 and the metal sheet 7. The aforementioned parts are received in the resin case (main body) 2 and the resin case (back cover) 8. The soft magnetic material 5 has a through-hole provided in the center thereof to reduce the weight of RFID system, making it possible to exert an effect of assuring desired wireless range while inhibiting the change of resonance frequency or the rise of loss due to eddy current generated in the metal present on the back of RIFD system.
  • Fig. 34(b) depicts a plan view of the soft magnetic material according to the present embodiment.
  • Fig. 34(c) depicts a side view of the soft magnetic material according to the present embodiment.
  • Fig. 34(d) depicts a perspective view of the soft magnetic material according to the present embodiment.
  • Fig. 35(a) depicts a plan view of the soft magnetic material according to the present embodiment.
  • Fig. 35(b) depicts a side view of the soft magnetic material according to the present embodiment.
  • Fig. 35(c) depicts a perspective view of the soft magnetic material according to the present embodiment.
  • the weight of the soft magnetic material can be reduced, and since the soft magnetic material has a fallen portion 10 formed in the center thereof, a part of the soft magnetic material is a planar continuous structure, making it possible to prevent the deterioration of strength thereof.
  • Fig. 36(a) depicts a plan view of the soft magnetic material according to the present embodiment.
  • Fig. 36(b) depicts a side view of the soft magnetic material according to the present embodiment of implementation of the present invention.
  • Fig. 36(c) depicts a perspective view of the soft magnetic material according to the present embodiment of implementation of the present invention.
  • the weight of the soft magnetic material can be reduced, and since the soft magnetic material has a fallen portion formed on the both surfaces of the center thereof, a part of the soft magnetic material is a planar continuous structure, making it possible to prevent the deterioration of strength thereof.
  • Fig. 37(a) depicts a plan view of the soft magnetic material according to the present embodiment of implementation of the present invention.
  • Fig. 37(b) depicts a side view of the soft magnetic material according to the present embodiment.
  • Fig. 37(c) depicts a perspective view of the soft magnetic material according to the present embodiment. In this arrangement, the desired strength can be maintained while attaining the reduction of weight of the soft magnetic material.
  • Fig. 38(a) depicts a plan view of the soft magnetic material according to the present embodiment.
  • Fig. 38(b) indicates a side view of the soft magnetic material according to the present embodiment of implementation of the present invention.
  • Fig. 38(c) indicates a perspective view of the soft magnetic material according to the present embodiment. In this arrangement, a variety of antenna patterns can be coped with while attaining the reduction of weight of the soft magnetic material.
  • Fig. 39(a) indicates a plan view of the soft magnetic material according to the present embodiment.
  • Fig. 39(b) indicates a side view of the soft magnetic material according to the present embodiment.
  • Fig. 39(c) indicates a perspective view of the soft magnetic material according to the present embodiment.
  • the soft magnetic material 22 comprises two or more layers of soft magnetic material 17 laminated on each other.
  • the reference numeral 16 indicates a joint comprising a laminate of soft magnetic material layers 17. In this arrangement, the thickness can be reduced while attaining the reduction of weight of the soft magnetic material.
  • Fig. 40(a) depicts a sectional view of a related art antenna apparatus.
  • Fig. 40(b) depicts a sectional view of the antenna apparatus according to the present embodiment.
  • Even a through-hole is formed in the soft magnetic material, the intensity of magnetic field cannot be reduced, making it possible to assure the desired wireless range. Further, an effect can be maintained of inhibiting the change of resonance frequency or the rise of loss due to eddy current generated in the metal present on the back thereof.
  • the reference numeral 1 indicates an antenna apparatus shown illustrating the internal structure of RFID system which comprises a resin case (main body) 2, an antenna pattern 3 formed on the antenna substrate, a matching circuit 4, a soft magnetic material 5, resin spacer 6, a metal sheet 7 and a resin case (back cover) 8 as shown in Fig. 34 .
  • the reference numeral 3 is an antenna pattern having a loop antenna structure.
  • the loop antenna may be a loop having an opening provided in the center thereof and may be in the form of circle, substantial rectangle or polygon.
  • the material of the loop antenna may be properly selected from the group consisting of electrically-conductive metal wire, metallic sheet, metallic foil, metallic cylinder, etc.
  • the reference numeral 4 indicates a matching circuit, and the connection of the matching circuit 4 makes it less likely that the antenna properties can be affected by metal present around the installation place and can prevent the occurrence of stationary wave due to nonmatching, making it possible to provide an antenna having stable operation and little loss.
  • the reference numeral 5 indicates a soft magnetic material
  • the soft magnetic material 5 is disposed on the back surface of the antenna pattern 3, and as the material thereof there may be used a soft magnetic ferrite, amorphous alloy, permaloy, electromagnetic steel, silicon steel, Fe-Al alloy, sendust alloy or the like.
  • a tabular or sheet-like soft magnetic material may be used.
  • the sheet-like ferrite may be prepared by kneading a ferrite powder with an organic binder such as resin material, and then drying the mixture. The use of the magnetic sheet makes it possible to assure flexibility and enhance impact resistance or durability.
  • the reference numeral 9 indicates a through-hole provided in the center of the soft magnetic material 5. The provision of the through-hole makes it possible to reduce the weight of the soft magnetic material.
  • the reference numeral 18 indicates a soft magnetic material according to another embodiment comprising a fallen portion 10 formed on one surface of the center thereof. In this arrangement, the desired strength can be maintained while attaining the reduction of weight of the soft magnetic material.
  • the reference numeral 19 indicates a soft magnetic material according to other embodiment having a fallen portion 11 formed on the both surfaces of the center thereof. In this arrangement, the desired strength can be maintained while attaining the reduction of weight of the soft magnetic material.
  • the reference numeral 20 indicates a soft magnetic material according to a further embodiment having a through-hole formed on one surface of the center thereof filled with a nonmagnetic resin 13 such as resin.
  • a nonmagnetic resin 13 such as resin.
  • the reference numeral 21 indicates a soft magnetic material according to a further embodiment the through-hole 14 provided in the center of which is in columnar form.
  • the through-hole 14 is not limited to this shape and may be in any other shape.
  • the shape of the through-hole 14 can be freely changed to cope with various antenna patterns.
  • the reference numeral 22 indicates a soft magnetic material according to a further embodiment illustrating a through-hole 15 provided in the center thereof.
  • the soft magnetic material 22 comprises a plurality of layers of soft magnetic material 17 laminated on each other.
  • the reference numeral 16 indicates a joint comprising a laminate of soft magnetic material layers.
  • the reference numeral 6 indicates a resin spacer disposed under the soft magnetic material 5 and as the material of the resin spacer there may be selected a resin or the like, making it possible to attain the reduction of weight.
  • the reference numeral 7 indicates a metal sheet and as the material of the metal sheet there is preferably used a nonmagnetic material such as aluminum sheet.
  • the reference numeral 2 indicates a resin case (main body) and the reference numeral 8 indicates a resin case (back cover).
  • the resin case (main body) 2 and the resin case (back cover) 8 are arranged to interpose parts such as antenna substrate and magnetic material, raising the ease of assembly during preparation and the dimensional precision of positioning and assembly of various elements and hence making it possible to eliminate the dispersion of properties.
  • the weight reduction can be attained and the desired wireless range can be assured while inhibiting the change of resonance frequency or the rise of loss due to eddy current generated in the metal present on the back of RIFD system.
  • a magnetic sheet is arranged to exhibit the maximum magnetic properties while maintaining the least required physical properties as magnetic sheet.

Landscapes

  • Details Of Aerials (AREA)

Claims (14)

  1. Appareil d'antenne (1) comprenant :
    une antenne cadre (3),
    une feuille magnétique (5) comprenant : une pluralité de blocs magnétiques (9) ayant des propriétés magnétiques et étant en forme de blocs ; et
    un substrat en feuille flexible sur lequel se forme ladite antenne cadre (3),
    dans lequel ladite pluralité susmentionnée de blocs magnétiques (9) sont agencés de manière plane de façon à former une couche magnétique et le substrat en feuille susmentionné retient la couche magnétique susmentionnée, et
    dans lequel la feuille magnétique est prévue au niveau du côté opposé de ladite antenne cadre (3) dudit substrat,
    caractérisé en ce que
    un trou traversant (11) est prévu au centre de ladite feuille magnétique au niveau d'une zone où ladite antenne cadre (3) n'est pas positionnée.
  2. Appareil d'antenne (1) de la revendication 1, dans lequel la couche magnétique susmentionnée est formée par les blocs magnétiques susmentionnés (9) ayant sensiblement la même forme.
  3. Appareil d'antenne (1) de la revendication 1, dans lequel la couche magnétique susmentionnée est formée par les blocs magnétiques susmentionnés (9) ayant différentes formes.
  4. Appareil d'antenne (1) de la revendication 1, dans lequel le substrat en feuille susmentionné est en forme de feuille et retient au moins une surface de la couche magnétique susmentionnée.
  5. Appareil d'antenne (1) de la revendication 1, dans lequel la pluralité de blocs magnétiques (9) sont obtenus en formant une poudre magnétique à base de ferrite en bloc.
  6. Appareil d'antenne (1) de la revendication 5, dans lequel la pluralité susmentionnée de blocs magnétiques (9) sont obtenus en formant la poudre magnétique à base de ferrite magnétique doux susmentionnée en bloc.
  7. Appareil d'antenne (1) de la revendication 1, dans lequel la pluralité de blocs magnétiques (9) comprennent au moins un bloc magnétique susmentionné (9) agencé de manière adjacente à un autre bloc magnétique susmentionné (9) à un intervalle prédéterminé.
  8. Appareil d'antenne (1) de la revendication 1, dans lequel la pluralité de blocs magnétiques (9) comprennent au moins un bloc magnétique susmentionné (9) agencé de manière adjacente à un autre bloc magnétique susmentionné (9) avec le substrat en feuille susmentionné interposé entre ceux-ci.
  9. Appareil d'antenne (1) de la revendication 1, dans lequel la pluralité de blocs magnétiques (9) comprennent au moins un bloc magnétique susmentionné (9) agencé de manière adjacente à un autre bloc magnétique susmentionné (9) et en contact avec celui-ci.
  10. Appareil d'antenne (1) de la revendication 1, dans lequel la pluralité de blocs magnétiques (9) forment un stratifié d'une pluralité des couches magnétiques susmentionnées.
  11. Appareil d'antenne (1) de la revendication 1, dans lequel le substrat en feuille susmentionné comporte la couche magnétique susmentionnée.
  12. Appareil d'antenne (1) de la revendication 1, dans lequel une partie abaissée est prévue sur au moins une surface de la couche magnétique susmentionnée au centre de celle-ci.
  13. Appareil d'antenne (1) de la revendication 1, dans lequel l'antenne susmentionnée (3) est un motif d'antenne formé par l'un(e) d'une feuille métallique, d'une pâte électriquement conductrice, d'un transfert de dépôt, d'une pulvérisation cathodique, d'un dépôt sous vide et d'une sérigraphie.
  14. Procédé de production d'un appareil d'antenne (1) qui comprend le fait :
    de mouler une poudre magnétique sous une forme de bloc,
    de cuire la poudre magnétique susmentionnée ainsi moulée pour former une pluralité de blocs magnétiques (9), et
    de retenir une couche magnétique, qui comprend la pluralité susmentionnée de blocs magnétiques (9) agencés de manière plane, par un substrat en feuille flexible,
    d'agencer une antenne cadre (3) au niveau du côté opposé de ladite couche magnétique dudit substrat,
    caractérisé par le fait
    de prévoir un trou traversant (11) au centre de ladite couche magnétique au niveau d'une zone où ladite antenne (3) n'est pas positionnée.
EP05790142.3A 2004-09-29 2005-09-29 Feuille magnetique, appareil d'antenne l'utilisant et procede de production d'une feuille magnetique Active EP1815558B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2004283886A JP2006101109A (ja) 2004-09-29 2004-09-29 アンテナ装置
JP2004287050A JP2006101370A (ja) 2004-09-30 2004-09-30 アンテナ装置
JP2004365726A JP4869587B2 (ja) 2004-12-17 2004-12-17 磁性シート
JP2004365716A JP4218635B2 (ja) 2004-12-17 2004-12-17 磁性材の製造方法およびアンテナ装置
PCT/JP2005/018494 WO2006036012A1 (fr) 2004-09-29 2005-09-29 Feuille magnétique, appareil d’antenne l’utilisant et procédé de production d’une feuille magnétique

Publications (2)

Publication Number Publication Date
EP1815558A1 EP1815558A1 (fr) 2007-08-08
EP1815558B1 true EP1815558B1 (fr) 2014-08-20

Family

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EP05790142.3A Active EP1815558B1 (fr) 2004-09-29 2005-09-29 Feuille magnetique, appareil d'antenne l'utilisant et procede de production d'une feuille magnetique

Country Status (2)

Country Link
EP (1) EP1815558B1 (fr)
WO (1) WO2006036012A1 (fr)

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KR101187172B1 (ko) 2007-03-07 2012-09-28 도다 고교 가부시끼가이샤 페라이트 성형 시트, 소결 페라이트 기판 및 안테나 모듈
JP5685827B2 (ja) * 2010-03-29 2015-03-18 ソニー株式会社 磁性シート、アンテナモジュール及び電子機器
US20120218068A1 (en) * 2011-02-28 2012-08-30 Equos Research Co., Ltd. Antenna
JP2012178959A (ja) * 2011-02-28 2012-09-13 Equos Research Co Ltd アンテナ
WO2013015222A1 (fr) 2011-07-22 2013-01-31 日立金属株式会社 Antenne
CN103401066B (zh) * 2013-08-06 2016-03-30 电子科技大学 一种uhf抗金属标签天线
KR101813301B1 (ko) * 2013-10-14 2017-12-28 삼성전기주식회사 자성시트, 무선충전 모듈 및 자성시트 제조방법
JP2015128142A (ja) 2013-11-28 2015-07-09 Tdk株式会社 コイルユニット
JP7344003B2 (ja) * 2018-04-24 2023-09-13 京セラ株式会社 Ｒｆｉｄタグおよびｒｆｉｄシステム

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DE3246128A1 (de) * 1981-12-15 1983-06-23 Fritz 7770 Überlingen Koch Magnetanordnung zur vergroesserung eines magnetischen kraftfeldes, insbesondere fuer therapeutische zwecke
JPS61163605A (ja) * 1985-01-11 1986-07-24 Ratsukasan:Kk マグネツトの装着方法及び装置
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US11869699B2 (en) 2018-05-22 2024-01-09 Premo, S.A. Inductive energy emitter/receiver for an inductive charger of an electric vehicle

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