JP2007043621A - ANTENNA DEVICE AND ANTENNA DEVICE MANUFACTURING METHOD - Google Patents

Abstract

An object of the present invention is to provide an antenna device mounted with a high-performance antenna-integrated magnetic sheet that is thin and lightweight, is low in cost, and has excellent productivity, and a method for manufacturing the antenna device.
The present invention relates to an antenna device in an RFID system that performs data communication without contact, and is provided in a magnetic member, an antenna provided in the magnetic member, a matching circuit provided in the magnetic member, and the magnetic member. At least one or all of the magnetic member, the antenna provided on the magnetic member, the matching circuit provided on the magnetic member, and the terminal connection provided on the magnetic member are made of resin, ultraviolet rays Productivity by forming a coated structure by using at least one of curable resin, visible light curable resin, thermoplastic resin, thermosetting resin, heat resistant resin, synthetic rubber, tape, or film. This is an antenna device that improves communication characteristics and improves communication characteristics.
[Selection] Figure 1

Description

  The present invention relates to an RF-ID, that is, an antenna used for a wireless communication medium processing apparatus that performs communication with a wireless communication medium such as an IC card or an IC tag, or an antenna mounted on the wireless communication medium itself, and the like, The present invention relates to an antenna device and a method for manufacturing the antenna device, which improve communication characteristics in a microwave system and are resistant to breakage.

  FIG. 12 is a perspective view of an antenna device according to a conventional technique in an exploded state. Conventionally, as shown in FIG. 12, a wireless communication processing device that performs communication with a wireless communication medium using an electromagnetic induction method or the like, and an antenna device 100 used for the wireless communication medium itself are affected by surrounding metal and are subjected to a magnetic field. However, the mutual inductance required for communication becomes insufficient, and the communication distance is shortened or communication cannot be performed. Therefore, in order not to be affected by the metal, the antenna pattern 102 and the metal are separated from each other by the resin spacer 105 or the like, or the magnetic member 104 made of ferrite or the like is placed close to or in contact with the antenna pattern 102, Some ideas have been made such as strengthening the magnetic field generated by the antenna pattern 102.

  Here, when the resin spacer 105 or the like is used, there are problems such as complicated adjustment during installation and workability related to the adjustment. The magnetic member 104 is made of a sintered bulk material of ferrite having hardness, but has a problem that cracking at the time of dropping and workability are inferior.

Thus, in order to provide durability against breakage while realizing strengthening of the magnetic field, for example, a device in which a flexible magnetic material is installed on the bottom surface or side surface of the antenna has been proposed (for example, Patent Document 1).
JP 2002-298095 A

  However, the flexible magnetic material shown in (Patent Document 1) is sufficient to ensure workability that can be processed into a sufficient shape in order to use sendust, permalloy, or the like of metallic magnetic powder. In a flexible magnetic body containing a large amount of such organic material, the magnetic field is not sufficiently strengthened even if it is placed in the vicinity of the antenna. There was a problem that it was insufficient for extending the communication distance of the processing device.

  In addition, a flexible magnetic body composed of metallic magnetic powder and organic material is not as good as sintered ferrite, but it has poor processability, high cost, and durability against breakage is still insufficient. There was a problem.

  Furthermore, in addition to poor workability, the insulation resistance is low, so there is a problem that it is easily affected by leakage current and the electric field from the outside world, which may cause malfunction of the antenna and the wireless communication medium processing device. .

  In addition, since the insulation resistance is low, the conductive member cannot be formed as a circuit pattern on the magnetic material, and various circuits such as a matching circuit for connecting the antenna and the processing device can be incorporated on the magnetic material. There is also a problem that it is not possible in terms of downsizing the apparatus.

  In consideration of the above problems, the present invention eliminates the influence of surrounding metal in an antenna that performs communication using an electromagnetic induction method or a microwave method, and has flexibility while realizing magnetic field enhancement, It is another object of the present invention to provide an antenna device and a method for manufacturing the antenna device that are highly durable.

  The present invention provides a magnetic member obtained by firing magnetic powder into a sheet, a holding member that holds at least one surface of the magnetic member, an antenna provided on at least one of the magnetic member and the holding member, and the holding member. And a resinous protective member that covers the magnetic member and the antenna.

  In the present invention, even when the magnetic member is formed in a sheet shape, the magnetic member is held by the holding member. Therefore, when the antenna is provided on the magnetic member or when the magnetic member and the antenna are covered with the protective member, The damage of the magnetic member can be suppressed. Thereby, it is possible to make the antenna device thinner while facilitating the handling of the magnetic member.

  The invention according to claim 1 of the present invention is provided on at least one of a magnetic member obtained by firing magnetic powder into a sheet, a holding member that holds at least one surface of the magnetic member, and the magnetic member and the holding member. And a resinous protection member that covers the antenna and the magnetic member held by the holding member.

  According to this configuration, even if the magnetic member is formed in a sheet shape, the magnetic member is held by the holding member, and therefore, when the antenna is provided on the magnetic member or the protective member covers the magnetic member and the antenna. At this time, the breakage of the magnetic member can be suppressed. Thereby, it is possible to make the antenna device thinner while facilitating the handling of the magnetic member.

  The invention according to claim 2 of the present invention is characterized in that the holding member holds both surfaces of the magnetic member.

  According to this configuration, since the breakage of the magnetic member can be further suppressed, the handling of the magnetic member can be further facilitated.

  The invention according to claim 3 of the present invention is characterized in that the holding member is resinous and covers the magnetic member.

  According to this configuration, even when the magnetic member is damaged when the magnetic member and the antenna are covered with the protective member, it is possible to suppress scattering of the broken powder generated from the magnetic member.

  The invention according to claim 4 of the present invention is characterized in that the holding member is an ultraviolet curable resin.

  According to this configuration, since the resin can be cured with ultraviolet rays, it is possible to prevent the magnetic member from being loaded as much as possible, and to further prevent the magnetic member from being damaged.

  The invention according to claim 5 of the present invention is characterized in that the antenna is a loop antenna, and the loop antenna has a matching circuit connected to one end thereof.

  According to this configuration, even when the period of the frequency band to be used is relatively long (for example, 13.56 MHz), the loop length can be shortened, so that the antenna device can be downsized while being thinned. I can do it.

  The invention according to claim 6 of the present invention is characterized in that the magnetic member is composed of a plurality of magnetic blocks.

  According to this configuration, the magnetic member and the antenna can be covered with the protective member without damaging the magnetic member. Thereby, handling of a magnetic member can be made still easier.

  The invention according to claim 7 of the present invention is characterized in that the magnetic member is fired with a magnetic powder of Ni—Zn based ferrite or Mn—Zn based ferrite.

  According to this configuration, since the magnetic member is made of ferrite, the loss of the magnetic field can be reduced. As a result, the communication distance can be improved while the antenna device can be thinned.

The invention according to claim 8 of the present invention is characterized in that the magnetic member is fired with magnetic powder of Fe ₂ O ₃ , ZnO, NiO, CuO, or Fe ₂ O ₃ , ZnO, MnO, CuO. And

  According to this configuration, since the magnetic member is made of ferrite, the loss of the magnetic field can be reduced. As a result, the communication distance can be improved while the antenna device can be thinned.

  According to the ninth aspect of the present invention, the magnetic member includes a plurality of members, the holding member holds at least one surface of the plurality of stacked magnetic members, and the antenna includes the plurality of stacked magnetic members. The protective member is provided on at least one of the holding member and covers the plurality of stacked magnetic members and the antenna.

  According to this configuration, since the magnetic member is laminated, the loss of the magnetic field can be reduced. As a result, the communication distance can be improved while the antenna device can be thinned.

  According to the tenth aspect of the present invention, the magnetic powder is baked into a sheet shape to form a magnetic member, and at least one surface of the formed magnetic member is held by the holding member, and the magnetic member and the holding member are held. An antenna is provided on at least one of the members, and the magnetic member held by the holding member and the antenna are covered with a resinous protective member.

  According to this configuration, even if the magnetic member is formed into a sheet shape, the magnetic member is held by the holding member, so that the magnetic member and the antenna are covered with the protective member while suppressing damage to the magnetic member. I can do it. Thereby, an antenna device that can be made thin can be easily manufactured.

  According to an eleventh aspect of the present invention, a magnetic powder is baked into a sheet shape, a plurality of magnetic members are formed, a plurality of magnetic members formed are stacked, and a plurality of stacked magnetic members are formed. At least one surface of the member is held by a holding member, an antenna is provided on at least one of the laminated magnetic members and the holding member, and the laminated magnetic members and the antenna are covered with a resinous protective member It is characterized by doing.

  According to this configuration, since the magnetic members are laminated, it is possible to easily manufacture an antenna device that can be thinned while improving the communication distance.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
First, the shape and structure of the antenna device of the present invention will be described.

  FIG. 1 is a perspective view of an antenna device according to the first embodiment of the present invention, and FIGS. 2 to 3 are sectional views of the structure of the antenna device according to the first embodiment of the present invention. 2 to 3 show an AA cross section of FIG.

  An antenna device 1 shown in FIG. 1 includes an antenna in which a magnetic member 2 mainly composed of a ferrite-based magnetic material, an antenna 3, a matching circuit 4, a terminal connection portion 5, a through hole 6, a protective member 7, and the like are formed. The antenna device may be stored in a wireless communication medium such as an IC card or an IC tag, or may be stored in a wireless communication medium processing device such as a reader or a reader / writer.

  Reference numeral 1 denotes an antenna device, 2 denotes a magnetic member, 3 denotes an antenna, 4 denotes a matching circuit, 5 denotes a terminal connection portion, 6 denotes a through hole, and 7 denotes a protective member.

  First, details of each part of the antenna device will be described with reference to FIG.

  First, the magnetic member 2 will be described.

  The magnetic member 2 has a form constituting an element of the antenna device 1 and is made of a metal material such as ferrite, permalloy, sendust, or silicon plywood.

The magnetic member 2 is preferably soft magnetic ferrite, and can be made into a fired body or a high-density ferrite fired body by dry press molding and firing ferrite powder, and the density of the soft magnetic ferrite is 3.5 g / It is preferable that it is cm ³ or more. Furthermore, it is preferable that the size of the magnetic body of the soft magnetic ferrite is not less than the crystal grain boundary. The magnetic member 2 has a sheet shape (or plate shape, film shape, layer shape) formed with a thickness of about 0.05 mm to 1 mm.

The soft magnetic ferrite may be made of Ni—ZnO ₃ , ZnO, NiO, CuO, or Fe ₂ O ₃ , ZnO, MnO, CuO. Furthermore, it may be a single layer of any magnetic material of amorphous alloy, permalloy, electromagnetic steel, silicon iron, Fe-Al alloy, sendust alloy, ferrite, amorphous foil, permalloy, electromagnetic steel, sendust The laminated body of these, and the laminated body which combined various magnetic bodies may be sufficient.

  The magnetic member 2 is covered with a holding member. The holding member is resinous, and here is an ultraviolet curable resin. Note that the type of the resin is not necessarily an ultraviolet curable resin, and various resins such as a visible light curable resin, a thermoplastic resin, a thermosetting resin, and a heat resistant resin can be used.

  Note that the holding member does not necessarily need to be coated with resin, and for example, the magnetic member 2 may be held by a sheet-like (or film-like) holding member. Further, it is sufficient that at least one surface of the magnetic member 2 is held, and both surfaces may be held with the magnetic member 2 sandwiched between two sheet-like holding members, or a single sheet-like holding member. One surface of the magnetic member 2 may be held.

  4 is a cross-sectional view of the single-layer magnetic member according to Embodiment 1 of the present invention, FIG. 5 is a cross-sectional view of the laminated magnetic member according to Embodiment 1 of the present invention, and FIG. 6 is a laminated magnetic member according to Embodiment 1 of the present invention. FIG. 7 is a sectional view of the divided magnetic member according to the first embodiment of the present invention. 4 to 8, an antenna, a matching circuit, a terminal connection portion, and the like are mounted as in FIGS. 2 and 3, but these are omitted here.

  Furthermore, as shown in FIG. 4, ferrite, amorphous alloy, permalloy, electromagnetic steel, silicon iron, Fe—Al alloy, sendust alloy alone, or laminate as shown in FIG. It may be coated (coated) by at least one means of ultraviolet curable resin, visible light curable resin, thermoplastic resin, thermosetting resin, heat resistant resin, synthetic rubber, tape, or film, 6 may be formed by laminating coated magnetic bodies, and the laminated magnetic member 2 may be pressed or laminated on the laminated magnetic member 2 as shown in FIG. The magnetic member 2 may be formed by applying heat and pressing.

  Further, ferrite, amorphous foil, permalloy, electromagnetic steel, Sendust simple substance and laminated body may be an aggregate of magnetic blocks 10 as shown in FIG. In contrast, the magnetic material can be formed efficiently. Furthermore, by arranging all the magnetic blocks 10 so that the upper and lower surfaces thereof are substantially the same surface, the thickness of the magnetic body required for the magnetic sheet, the mechanical strength, and other physical performance ranges. Since the maximum volume can be utilized and the specific surface area of the magnetic block 10 in the entire magnetic layer is reduced, the amount of the protective member 7 can be reduced, and high magnetic performance can be obtained.

  The magnetic member 2 of the present invention is composed of a single layer, a multilayer structure, or a magnetic block as shown in FIGS. 4 to 8, and is made of resin, ultraviolet curable resin, visible light curable resin, thermoplastic resin, heat Coating with at least one of curable resin, heat resistant resin, synthetic rubber, tape, or film provides high flexibility and durability, high surface resistance, pattern printing and plating on the surface, etc. It is easy to form a circuit by the above, and it is also easy to form a through hole between layers. For this reason, the terminal connection part 5 of the antenna 3 can be formed in arbitrary places.

  Further, since the magnetic member 2 coated with the protective member 7 has appropriate flexibility, it can be easily punched and formed by punching or the like, so that complicated shapes can be processed at low cost and in large quantities. It can also be molded into

  In addition, since the sintered body of the magnetic member is usually very brittle, it is impossible to form an antenna, a matching circuit, or a terminal connection portion on the sintered body. By coating with a curable resin, thermoplastic resin, thermosetting resin, heat resistant resin, synthetic rubber, tape, or film, an antenna, matching circuit, and terminal connection can be formed on the magnetic member. The antenna device can be reduced in size and thickness.

  Furthermore, as the shape of the magnetic member 2, it may be formed in a shape such as a substantially triangular prism, a substantially quadrangular prism, a substantially cylindrical shape, or a substantially spherical shape.

  Next, the antenna 3 will be described.

  Reference numeral 3 denotes an antenna pattern of the antenna, which has a loop antenna structure. The loop antenna may have a loop shape with an opening at the center, and the shape may be circular, substantially rectangular, or polygonal. By adopting the loop antenna structure, a sufficient magnetic field is generated to enable communication between the wireless communication medium and the wireless communication medium processing device by the generation of inductive power and mutual inductance.

  Further, since the surface resistance of the magnetic member 2 is large, a circuit can be formed directly on or inside the magnetic member 2, so that the antenna 3, the matching circuit 4, and the terminal connection portion 5 can be formed directly on the magnetic member 2. It is.

  Furthermore, as a material of the loop antenna, it can be appropriately selected from conductive metal wire material such as gold, silver, copper, aluminum, nickel, metal plate material, metal foil material, metal tube material, etc. It can be formed by metal wire, metal foil, conductive paste, plating transfer, sputtering, vapor deposition, or screen printing. As a result, the antenna 3, the matching circuit 4, and the terminal connection portion 5 can be formed integrally with the magnetic member 2, whereas it has conventionally been necessary to form the magnetic member 2 separately from the magnetic member 2. A thin antenna device 1 can be formed.

  Next, the matching circuit 4 will be described.

  Reference numeral 4 denotes a matching circuit. The matching circuit is composed of a capacitor, for example, a chip capacitor such as a multilayer ceramic capacitor. By connecting the matching circuit 4, the antenna device 1 is less susceptible to the influence of the antenna characteristics due to the metal around the installation place, and is stable in operation by suppressing the occurrence of standing waves due to mismatching. It becomes. Further, even when the frequency band used is relatively long (for example, 13.56 MHz), the loop length can be shortened, so that the antenna device can be reduced in size while being reduced in thickness. .

  Next, the terminal connection part 5 is demonstrated.

  Reference numeral 5 denotes a terminal connection portion. Since the surface resistance of the magnetic member 2 is large, it can be directly formed on the surface of the magnetic member 2. The terminal connection portion 5 may be formed on both sides of the loop as shown in FIG. 1, or may be formed to face each other at the end of the loop.

  Further, the material of the terminal connection portion 5 may be appropriately selected from conductive metal wire materials such as gold, silver, copper, aluminum and nickel, metal plate materials, metal foil materials, metal cylinder materials, and the like. It can be formed by metal wire, metal foil, conductive paste, plating transfer, sputtering, vapor deposition, or screen printing.

  Next, the through hole 6 will be described.

  Reference numeral 6 denotes a through hole, which is used to electrically connect the antenna 3 formed on the surface of the magnetic member 2, the matching circuit 4, and the terminal connection portion 5.

  The material of the through hole 6 can be appropriately selected from conductive metal wire such as gold, silver, copper, aluminum, nickel, metal plate, metal foil, or metal cylinder. , Metal wire, metal foil, conductive paste, plating transfer, sputtering, vapor deposition, or screen printing.

  Next, the protection member 7 will be described.

  Reference numeral 7 denotes a protective member. The protective member 7 is made of a resin, an ultraviolet curable resin, a visible light curable resin, a thermoplastic resin, a thermosetting resin, a heat resistant resin, a synthetic rubber, a tape, or a film. Even if at least one means is used and selection is made in consideration of weather resistance such as heat resistance and moisture resistance as well as flexibility with respect to bending and bending of the antenna device 1 and each component constituting the antenna device 1 Good. In addition, one side, both sides, one side, both sides, or the entire surface of each component constituting the antenna device 1 and the antenna device 1 are coated with the protective member 7.

  In particular, the magnetic member 2 of the fired body is normally broken by bending, bending, or the like, whereas one side, both sides, one side, both sides, or the entire surface of the magnetic member 2 of the fired body is made of resin, ultraviolet rays When coated with a protective member 7 such as a curable resin, visible light curable resin, thermoplastic resin, thermosetting resin, heat resistant resin, synthetic rubber, tape, or film, it will have excellent flexibility. The surface resistance is high, and it becomes easy to form a circuit by pattern printing or plating on the surface.

  Further, since the magnetic member 2 coated with the protective member 7 has appropriate flexibility, it can be easily punched and formed by punching or the like, so that complicated shapes can be processed at low cost and in large quantities. It can also be molded into

  Next, a method for manufacturing the antenna device 1 will be described.

The sintered body of the magnetic member 2 is made of Ni—Zn-based ferrite or Mn—Zn-based ferrite. Specifically, in the Ni—Zn-based ferrite, specifically, 48.5 mol% of Fe ₂ O ₃ and 20 of ZnO are used. 0.55 mol%, NiO 20.55 mol%, and CuO 10.40 mol% in a composition ratio, and calcined in the range of 750 ° C. to 900 ° C. for 4 hours.

  3000 g of magnetic calcined powder (magnetic powder) having the above composition, 135 g of Metrolose 60SH4000 (manufactured by Shin-Etsu Chemical Co., Ltd.) as a water-soluble binder, 270 g of ceramisole C-08 (manufactured by Nippon Oil & Fats) as an oily plastic material, and distilled water 340 g was mixed with a mixer for 20 minutes, and three rolls were further passed three times to form a soil. This soil is stored and aged at 5 ° C. for 96 hours, and then a sheet having a thickness of about 3 mm is produced by a vacuum extrusion molding apparatus.

  Next, this sheet is dried by passing the surface of a drum dryer at 95 ° C., cut to a predetermined size, and a sheet having a thickness of 2.8 mm is produced, and baked at 900 ° C. for 3 hours. Thus, a fired body having a thickness of 2.5 mm was produced.

  The fired body is subjected to screen printing on the entire surface with an ultraviolet curable resin as a holding member by a screen printer, and an ultraviolet curable resin having a film thickness of 20 to 150 μm is formed on the fired body of the magnetic member 2. The ultraviolet curable resin is a transparent acrylic resin and has a viscosity of 500 to 6000 mPa · S. The UV curable resin as the holding member is easy to handle and contains no environmentally hazardous substances and is an effective material for preventing environmental pollution. After the ultraviolet curable resin is formed on the fired body, the ultraviolet curable resin is cured by irradiating ultraviolet rays for 10 seconds with an ultraviolet irradiator.

  By coating the entire surface with an ultraviolet resin, the fired body of the magnetic member 2 can prevent the occurrence of cracks, cracks, chips, etc. with respect to external stress and impact, and the magnetic member 2 has flexibility, It is difficult to break, and particularly when used close to or in contact with the antenna, it is possible to improve the impact resistance and durability during manufacture, use, or transportation. In addition, the workability is improved and the load during processing is reduced, so that low cost can be realized.

  Next, two to three layers of the magnetic member 2 coated with the ultraviolet curable resin are laminated. When the magnetic member 2 is laminated, a thermosetting resin is uniformly applied to the magnetic member 2 between the layers, and is put in a high-temperature bath at 150 ° C. for 1 hour to cure the resin. Thereafter, a pressure of 1.5 MPa is applied by the press device 9. By applying pressure, the film thickness of the magnetic member 2 becomes 200 to 500 μm, and the magnetic member 2 that is dense and excellent in magnetic properties can be produced.

  This magnetic member 2 is punched with a punching machine to produce a molded body of the magnetic member 2. Normally, the fired body of the magnetic member 2 is very brittle and cannot be punched. On the other hand, by coating the magnetic member 2 with an ultraviolet curable resin, the ultraviolet curable resin enters between the particles of the magnetic member 2. As a result, the magnetic member 2 has very excellent flexibility, can be easily punched, and the magnetic member 2 with excellent dimensional accuracy can be manufactured.

  After punching the magnetic member 2, the through hole 6 is formed by punching. The through hole 6 is formed using a copper conductive paste.

  Thereafter, a copper foil loop antenna as the antenna 3 is formed on the magnetic member 2 by the transfer method. Since the magnetic member 2 is a sintered body of 900 ° C. using a magnetic material and has high insulation resistance, the antenna 3 is formed directly on the magnetic member 2.

  The plurality of laminated magnetic members 2 may be further covered with a protective member 7. In this case, as described above, the protective member 7 can use various resins such as an ultraviolet curable resin, a visible light curable resin, a thermoplastic resin, a thermosetting resin, and a heat resistant resin. .

  Thus, by bringing the antenna 3 into contact with the magnetic member 2, the magnetic field strength can be increased and the communication distance can be increased as compared with the conventional antenna device using the antenna substrate.

  Further, various circuits such as an antenna 3, a matching circuit 4, and a terminal connection portion 5 are formed on the magnetic member 2. Since various circuits such as the antenna 3, the matching circuit 4, and the terminal connection portion 5 can be formed on the magnetic member 2, the antenna device 1 can be reduced in size.

  Finally, the entire surface of the antenna device 1 excluding the terminal connection portion 5 is screen-printed with an ultraviolet curable resin by a screen printer, and the antenna device 1 is coated with the ultraviolet curable resin. The antenna device 1 is completed through such steps.

  Next, a comparison was made between the flexibility of the magnetic member 2 of the present embodiment and a fired body of a metallic magnetic material such as Sendust or Permalloy.

  In the comparison method, each comparison piece was bent at 90 degrees, and the property change was repeated. The comparison results are shown in (Table 1). “Example of the present invention” shown in Table 1 is a magnetic member similar to FIG. 4, and “Comparative Example” shown in Table 1 is an uncoated magnetic member.

  From this table, it can be seen that the magnetic member 2 of the present embodiment is very excellent in flexibility as compared with the comparative example. This is because when the entire surface of the sintered magnetic member 2 is coated with an ultraviolet curable resin, the ultraviolet curable resin enters between the particles of the magnetic material from the surface of the magnetic member 2 of the sintered body. This is because flexibility can be obtained.

  Further, using the wireless communication medium processing antenna device, the magnetic member 2 of the present embodiment is compared with the magnetic member 2 obtained by kneading a metal-based magnetic powder such as Sendust or Permalloy with an organic binder. It was.

  FIG. 9 is a cross-sectional view of the antenna unit of the wireless communication medium processing antenna device according to the first embodiment of the present invention, and FIG. 10 is a perspective view of the antenna unit of the wireless communication medium processing antenna device according to the first embodiment of the present invention. Show. 51 is an antenna unit, 52 is a cable, 53 is a reader / writer device, and 54 is an RF unit. Here, the shape of the magnetic member 2 is 40 mm × 30 mm × 2 mm. The antenna 3 was a copper loop antenna having a thickness of 1 mm and was installed on the magnetic member 2.

  Here, the actual generation of magnetic flux from the antenna unit 51 and the effect of the magnetic member when metal is present at the bottom of the antenna unit 51 will be described.

  FIG. 11 shows a magnetic flux generation diagram with and without the magnetic member 2 of the radio communication medium processing antenna device (antenna unit). FIG. 11A shows a case where the magnetic member 2 is present, and FIG. 11B shows a case where the magnetic member 2 is not present.

  55 is a magnetic flux and 56 is a metal material. Reference numeral 57 denotes a non-magnetic substrate. When a signal is input to the antenna unit, a magnetic flux 55 is generated near the antenna. In this case, as shown in FIG. 11A, when the magnetic member 2 is installed in the antenna unit, the magnetic flux 55 is expanded without being affected by the metal material 56, and the communication distance is extended. However, as shown in FIG. 11B, if there is no magnetic member 2 in the unit, an eddy current is generated around the magnetic flux 55 passing through the metal and converted into heat. Communication distance will not increase. Therefore, it is very important to install the magnetic member 2 in the antenna unit 51, and the magnetic characteristics of the magnetic member 2 influence the expansion of the communication distance.

  Therefore, the communication distance of the magnetic member 2 was measured using an IC tag as an example of a wireless communication medium as an output of 2.5 W of the antenna unit 51. The measurement results are shown in (Table 2). “Example of the present invention” shown in Table 2 is the antenna device shown in FIG. 4, and “Comparative example” shown in Table 2 is the conventional antenna device shown in FIG.

  From this table, it can be seen that in the magnetic member 2 of the present embodiment, the communication distance is extended to 130 mm, which is superior to the comparative example. This is because the magnetic member 2 is formed of a dense fired body, so that the magnetic flux 55 is expanded and the communication distance is extended.

  The communication distance when the magnetic members are stacked is shown in (Table 3). “Example of the present invention” shown in Table 2 is the antenna device shown in FIG. 4, and “Comparative example” shown in Table 2 is the conventional antenna device shown in FIG.

  In (Table 3), the communication distance is measured by changing the number of stacked magnetic members, and when the number of stacked layers is increased from 1 sheet configuration → 2 sheets configuration → 3 sheets configuration, the communication distance is 103.0 mm → 123. It increases from 0 mm to 132.5 mm. In addition, the “cell sheet product” in (Table 3) is a magnetic member made up of a plurality of magnetic blocks in a single sheet configuration, and the “cell resin coated product” in (Table 3) is “cell sheet” Product ".

  As described above, when the wireless communication medium processing antenna device is used as a product shelf or a product basket, product management can be performed appropriately.

  For example, when the product is a medicine, the name, expiration date, delivery date, etc. are set in advance on the IC tag attached to these products, and the box-shaped body is used as a medicine storage shelf. Can easily manage the inventory of medicines, for example, by discarding medicines immediately before the expiration date in advance and storing only how much medicines remain. Similarly, the same applies to the case where the product is a book or food. For this reason, there is a merit that efficiency such as inventory is greatly improved.

  As described above, the magnetic member 2 is processed into a plate shape, a sheet shape, or the like, and an antenna incorporated in a wireless communication medium such as an IC tag or the like, or a rear surface or a bottom surface of an antenna that performs communication with the wireless communication medium. By adopting a form close to or in contact with a position such as a side surface, the influence of surrounding metal is avoided and the magnetic field strength is increased as compared with the magnetic member 2 using the conventional metal-based magnetic powder. And the communication distance can be increased. In addition, since the magnetic member 2 can be made more flexible than when ferrite or metal-based magnetic powder is used, it is less likely to be damaged during manufacture, transportation, or use, and durability. A high antenna unit can be formed. As a result, it is possible to simultaneously improve the performance and durability of the wireless communication medium and the wireless communication medium processing device.

  In addition, by providing a metal member outside the magnetic member 2 (at a position where the magnetic member is sandwiched with the antenna), it has a merit of having a role of a shield and preventing leakage of a magnetic field emitted from the antenna on the outside. By this. For example, it is suitable when it is desired to exchange only with a wireless communication medium existing only inside the antenna.

  The present invention is a wireless communication medium processing apparatus that supplies power and transmission data to a wireless communication medium such as a non-contact IC card or IC tag stored in a product shelf and obtains reception data from the wireless communication medium due to load fluctuations. Especially for applications that need to expand the communication range, such as storage shelves that enable automatic product management and book management, medicine management other than display shelves, dangerous goods management, valuables management system, etc. Applicable.

The perspective view of the antenna apparatus in Embodiment 1 of this invention Sectional drawing of structure of antenna apparatus in Embodiment 1 of the present invention Sectional drawing of structure of antenna apparatus in Embodiment 1 of the present invention Sectional drawing of the single layer magnetic member in Embodiment 1 of this invention Sectional drawing of the laminated magnetic member in Embodiment 1 of this invention Sectional drawing of the laminated magnetic member in Embodiment 1 of this invention Sectional drawing of the division | segmentation magnetic member in Embodiment 1 of this invention Sectional drawing of a lamination | stacking magnetic member when using the press in Embodiment 1 of this invention Sectional drawing of the antenna unit of the radio | wireless communication medium processing antenna apparatus in Embodiment 1 of this invention 1 is a perspective view of an antenna unit of a radio communication medium processing antenna device according to a first embodiment of the present invention. Generation diagram of magnetic flux with and without magnetic member of antenna device for processing wireless communication media The perspective view in the disassembled state of the antenna apparatus in a prior art

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Antenna apparatus 2 Magnetic member 3 Antenna 4 Matching circuit 5 Terminal connection part 6 Through hole 7 Protection member 8 Chip capacitor 9 Press apparatus 10 Magnetic block 100 Antenna apparatus 101 Resin case (main body)
102 Antenna pattern 103 Matching circuit 104 Magnetic material part 105 Resin spacer 106 Metal plate 107 Resin case (rear cover)

Claims (11)

A magnetic member obtained by firing magnetic powder into a sheet;
A holding member for holding at least one surface of the magnetic member;
An antenna provided on at least one of the magnetic member and the holding member;
A resinous protection member that covers the antenna and the magnetic member held by the holding member,
An antenna device characterized by that. The holding member holds both surfaces of the magnetic member;
The antenna device according to claim 1. The holding member is resinous and covers the magnetic member;
The antenna device according to claim 1 or 2, wherein The holding member is an ultraviolet curable resin.
The antenna device according to claim 3. The antenna is a loop antenna;
The loop antenna has a matching circuit connected to one end,
The antenna device according to any one of claims 1 to 4, wherein the antenna device is provided. The magnetic member is composed of a plurality of magnetic blocks.
The antenna device according to any one of claims 1 to 5, wherein The magnetic member was fired with the magnetic powder of Ni-Zn ferrite or Mn-Zn ferrite,
The antenna device according to claim 1, wherein the antenna device is an antenna device. The magnetic member was fired with the magnetic powder of Fe ₂ O ₃ , ZnO, NiO, CuO or Fe ₂ O ₃ , ZnO, MnO, CuO,
The antenna device according to claim 7. The magnetic member comprises a plurality of
The holding member holds at least one surface of the plurality of laminated magnetic members,
The antenna is provided on at least one of the plurality of laminated magnetic members and the holding member,
The protective member covers the plurality of magnetic members stacked and the antenna.
The antenna device according to claim 1, wherein the antenna device is an antenna device. The magnetic powder is fired into a sheet to form a magnetic member,
Holding at least one surface of the formed magnetic member with a holding member;
An antenna is provided on at least one of the magnetic member and the holding member,
Covering the magnetic member held by the holding member and the antenna with a resinous protective member,
A method for manufacturing an antenna device. A plurality of the magnetic members are formed by firing magnetic powder into a sheet,
Laminating the plurality of magnetic members formed,
Holding at least one surface of the plurality of laminated magnetic members with a holding member;
An antenna is provided on at least one of the plurality of magnetic members and the holding member stacked,
The plurality of laminated magnetic members and the antenna are covered with a resinous protective member.
The method of manufacturing an antenna device according to claim 10.