JP3874744B2 - Small high sensitivity antenna - Google Patents

Small high sensitivity antenna Download PDF

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JP3874744B2
JP3874744B2 JP2003285350A JP2003285350A JP3874744B2 JP 3874744 B2 JP3874744 B2 JP 3874744B2 JP 2003285350 A JP2003285350 A JP 2003285350A JP 2003285350 A JP2003285350 A JP 2003285350A JP 3874744 B2 JP3874744 B2 JP 3874744B2
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magnetic metal
resin
antenna
weir
metal powder
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JP2005057444A (en
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展弘 丸子
光伸 吉田
洋 渡辺
卓雄 田島
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三井化学株式会社
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The present invention relates to rod-shaped antenna that converts radio waves to electrical signals. For example, it is a rod-shaped antenna that receives, transmits, and transmits / receives radio waves, such as an RFID antenna, an in-vehicle immobilizer antenna, an electronic key antenna, a radio clock antenna, a radio antenna , a small antenna for a portable device, and the like. In order to further improve the sensitivity of these rod- shaped antennas, the present invention relates to a rod-shaped antenna in which weirs containing magnetic metal powder are provided on one side or both ends of the rod-shaped antenna.

With the remarkable development of the electronic and communication fields, the demand for magnetic application products used in electrical and electronic equipment is rapidly expanding, and the resulting diversification of product forms is rapidly progressing. There is a growing demand for downsizing, downsizing, and high efficiency. Used in these devices, antenna is thinner for converting radio waves into electrical signals, downsizing, high efficiency is desired.

Conventionally, as disclosed in JP-A-7-278763 (Patent Document 1), as shown in FIG. 3, an amorphous alloy ribbon having particularly excellent magnetic properties is used as a rod-shaped antenna core , and the antenna core is used as the antenna core. by winding the coil, Q value is high sensitive antenna is proposed at 100kHz or more. As a measure for improving this technique, a method disclosed in Japanese Patent Laid-Open No. 2001-337181 (Patent Document 2) has been proposed. According to this method, the flange is formed at both ends of the rod-shaped core member of the antenna, and the coil is wound between the flanges. By adding this flange, it becomes possible to improve the receiving sensitivity of the antenna. However, with the miniaturization of devices, further reduction in thickness, size, and high performance antennas are desired.
JP-A-7-278763 JP 2001-337181 A

Information communication using recent radio waves, for example, locking system for security, ID cards, RFI D information transmission and reception to be used in transponder tag or the like, are used in like. In these applications, from being used in mobile and, further thinning for the tag and keys, and the like, there is a market demand of the card of. In order to further reduce the size of the antenna used for such applications , it is necessary to make the antenna core material thinner and shorter .

  However, as the volume of the antenna decreases, the L value or Q value of the antenna decreases, and the antenna sensitivity proportional to the product of the L value and the Q value decreases. As a result, practically sufficient radio wave reception sensitivity may not be obtained.

The present invention is without changing the length of the antenna, L value, to improve the Q value, to realize the improvement of the reception sensitivity of the antenna, or further thinned without changing the sensitivity, downsizing The task is to do.

  As a result of earnest research to solve such problems, we have found the following.

The present invention is characterized in that a weir is provided at an end portion of a core material in an antenna in which a conductive wire covered with an insulator is wound around a core material in which amorphous magnetic metal ribbons are laminated. Provide an antenna.

Weir provided in the core material is characterized by comprising a composition comprising magnetic metals powders.

The weir provided in the core material is made of a composite containing a composition comprising magnetic metal powder and resin.

The magnetic metal powder, the use of a nanocrystalline magnetic metal powder is one of the preferred embodiments of the present invention.

Is one of the preferred embodiments of the present invention that the shape of the magnetic metal powder is Bian flat shape.

The present invention provides a weir comprising a magnetic metal powder 5~60Vol% resin 95~40Vol% to make weir.

In the antenna conductive wire coated with an insulating material in the core material is wound, by weir end of the core material is eclipsed set, that L value of the antenna to obtain an improved miniature high sensitivity antenna did it. As a result, L value may be constant, the winding number of the coated conductive wire is be reduced by an insulator. As a result, fewer copper loss, can improve the Q value, transmission and reception sensitivity of the antenna can be greatly improved. In addition, the width and height of the antenna are reduced by reducing the number of turns, and the antenna can be made smaller and thinner.

Next, embodiments of the present invention will be specifically described.
(antenna)
An example of the antenna of the present invention is shown in FIG. The present invention is composed of three elements: an antenna core 11, a weir 12, and a conductive wire 13 covered with a wound insulator .

The antenna core is made of a magnetic material, and a conductive wire covered with an insulator is wound around the center of the antenna core. Both ends of the conductive wire covered with the wound insulator are preferably in contact with the weir. The weir is formed of a composition of magnetic metal powder and resin .
(Antenna core)
The core material of the antenna of the present invention will be described.

The shape of the core of the antenna can be cylindrical, like various forms of prismatic and the like. Among them, a rectangular parallelepiped or a rectangular column is preferable because it can be easily manufactured by cutting when a laminated body is formed .

Core antenna comprises a magnetic material, the magnetic body shape of a plate shape. As the material, for example, A Amorphous magnetic metals, nanocrystalline magnetic metal.

Among them, Co-based amorphous magnetic metal strip, Fe-based amorphous magnetic metal strip or the like has a high magnetic permeability is suitable as a material for the core loss is small fry small thin antenna. However, since one is 1 0 to 30 [mu] m and thin, in order to obtain the required performance, in fact by stacking a plurality, and the shape of the core material of the antenna. The core material of the antenna made of a laminate in which a heat-resistant resin such as polyimide and Co-based amorphous magnetic metal ribbons and Fe-based amorphous magnetic metal ribbons are alternately stacked includes Co-based amorphous magnetic metal ribbons, A laminated body made of a heat-resistant resin such as a Fe-based amorphous magnetic metal ribbon and polyimide is most preferable. Moreover, after these laminated bodies are laminated, heat treatment necessary for improving the magnetic properties of the amorphous metal can be performed, and thereafter, machining can be performed.

A laminate comprising this amorphous magnetic metal ribbon and a heat-resistant resin can be produced by the following method.
(Amorphous magnetic metals ribbon)
As the magnetic material used for the amorphous magnetic metal ribbon used for the core material of the antenna of the present invention, Fe-based and Co-based amorphous magnetic metal ribbons are used. These Amorufu § scan magnetic metal ribbon, an ordinary molten metal using a chill roll, obtained by rapid cooling. Usually, a thickness of 10 to 50 μm is used, and a ribbon having a thickness of 10 to 30 μm is preferably used.

The Fe-based amorphous magnetic metallic material, Fe-Si-B-based, Fe-B-based, Fe-P-C system, etc. of Fe- metalloid based amorphous magnetic metal material and Fe-Zr type, Fe-Hf type, Fe An Fe-transition metal amorphous magnetic metal material such as -Ti can be mentioned. The Co-based amorphous magnetic metallic material Co-Si-B-based, amorphous magnetic metallic material of Co-B system or the like can be exemplified. Among these, materials having the following composition are more preferable as materials having a high Q value.

The composition of the amorphous magnetic metal ribbon has the general formula (Co 1-c Fe c ) 1-ab X a Y b (wherein X is at least one selected from Si, B, C, Ge) represents an element, Y is selected Zr, Nb, Ti, Hf, Ta, W, Cr, Mo, V, Ni, P, Al, Pt, R h, Ru, Sn, Sb, Cu, Mn, rare earth elements It is represented by at least one kind of element, where c, a, and b are 0 ≦ c ≦ 0.2, 10 <a ≦ 35, and 0 ≦ b ≦ 30 , respectively, where a and b are atomic%) The represented composition is preferred. Replacing the Co of the amorphous magnetic metal strip by Fe tends to make increasing the saturation magnetization of amorphous magnetic metal. For this reason, the substitution amount c is preferably 0 ≦ c ≦ 0.2, and more preferably 0 ≦ c ≦ 0.1.

X elements in the production of amorphous magnetic metal strip used in the present invention is an element effective to slow the sintering crystallization speed. When the X element is less than 10 atomic%, a mix of part crystalline, When it exceeds 35 atomic%, the crystalline mechanical strength of the metal strip but not mixed is decreased, continuous ribbon It cannot be obtained. Therefore, the amount a of the X element is preferably 10 <a ≦ 35, and more preferably 12 ≦ a ≦ 30.

The Y element is effective in the corrosion resistance of the amorphous magnetic metal ribbon used in the present invention. Particularly effective element in this, Zr, Nb, Mn, W , Mo, Cr, V, Ni, P, Al, Pt, R h, an Ru element. If the amount of Y element added is 30% or more, there is an effect of corrosion resistance, but the mechanical strength of the ribbon is reduced, so 0 ≦ b ≦ 30 is preferable. A more preferable range is 0 ≦ b ≦ 20.

Further, the amorphous magnetic metal strip, for example, those obtained by compounding metal having a desired composition was melted with high frequency melting furnace or the like, a material obtained by a uniform melt, and flow with an inert gas or the like, It is obtained by spraying on a quenching roll and quenching. Usually, the thickness is 5 to 50 μm, and preferably a 10 to 30 μm ribbon is used. As the amorphous magnetic metal ribbon used in the present invention, an amorphous magnetic metal material produced in a sheet shape by a liquid quenching method or the like can be used. Or it can be used after the powdered amorphous magnetic metallic material into a sheet by a press forming type. In addition, as the amorphous magnetic metal ribbon used in the present invention, a single amorphous magnetic metal ribbon may be used , or a stack of many kinds of amorphous magnetic metal ribbons may be used.
(Coating Ko及 beauty product layer of the resin)
The core material of the antenna of the present invention is produced from an amorphous magnetic metal ribbon whose surface is coated with a heat resistant resin . A coating apparatus such as a roll coater, creating a coating of a resin that is liquid-like amorphous magnetic metal strip on, be produced by a method of imparting resistance to Netsuju fat to the amorphous magnetic metal strip by drying it Can do.

When fabricating an antenna core material of imparting resistance Netsuju fat product layer structure amorphous magnetic metal strip can be laminated and integrated by, for example, hot press or hot roll or the like. Temperature of pressurization varies depending on the type of heat-resistant resin, generally, it is preferable to laminate adhesion at a temperature near the softening or melt in heat-resistant resin of the glass transition temperature or higher.
(Method for manufacturing antenna)
Core antenna is processed into the shape of Nozomu Tokoro. The shaping method, Dicer processing, punching, etching, laser processing, electrical discharge wire machining, is processed by a water jet pressure Engineering like. Among these, dicer processing is preferable when the shape of the antenna core is rectangular. In the case of a shape other than a rectangle, it is preferable to perform punching or etching.

Since the core material of the antenna is made of amorphous magnetic metal strip is subjected to a heat treatment at 20 0 to 500 ° C. required magnetic property development of amorphous magnetic metal.
(Weir)
The weirs of the present invention are arranged at both ends of the antenna core material region around which the coated conductive wire is wound. Usually, the wound wire and the weir are in contact.

The shape of the weir of the present invention, specifically Meet cap shape perforated because of through holes is core of the rod-shaped antenna through as shown in FIG. 1, the core material of the antenna as shown in FIG. 2 A case structure may be used. By a case-shaped dam covering core of the rod-shaped antenna, sometimes in rod-shaped core of an edge of the antenna winding the wire, significantly reduces the possibility of dielectric breakdown peeling coating of the wire. However, because the thickness of the case amount is increased, if thinning is required, which is disadvantageous.

When the weir has a through hole as shown in FIG. 1, it is desirable that the shape of the through hole substantially coincides with the cross-sectional shape of the antenna core material and that there is no gap when fitted to the antenna core material. The longitudinal length of the shape of the weir of FIG. 1, it is not good is from 2 to 30% of the length of the core material of the antenna. More preferably, the length is 5 to 20% of the length of the antenna core .
(Materials constituting the weir )
The weir of the present invention is composed of a composite of magnetic metal powder and resin.

A composite method of the magnetic metal powder constituting the weir, the resin constituting the weir and the weir will be described below.
(Magnetic metal powder used for weirs )
Magnetic metal powder are use to dam of the present invention include nanocrystalline magnetic metal powder powder, and amorphous magnetic metal powder powder is. It found that there is a diplomatic fruit authored in improving the L value and the Q value of the antenna by using A Amorphous magnetic metal powder powder and nanocrystalline magnetic metal powder powder to construction materials of the dam. Flat nanocrystalline magnetic metal powder and flat amorphous magnetic metal powder powder has a diplomatic fruit authored in improving the L value and the Q value of the antenna is found.
(Nanocrystalline magnetic metal powder used for weirs )
Nanocrystalline magnetic metal powder are use to dam of the present invention the tissue is a magnetic metal powder based on the following nanocrystalline grain particle size 100 nm, heat treatment of the amorphous metals at crystallization temperature or higher, nanocrystals It is obtained by precipitating the grains.

The composition of nanocrystalline magnetic metal powder, good in typical Fe-Cu-Nb-Si- B system as nanocrystalline magnetic metal material Iga, but are not limited to the following composition, and most preferably, the general formula (Fe 1 -x M x) 100-a- b-c-d Si a Al b B c M 'd ( wherein, M is Co and / or Ni, M' is Nb, Mo, Zr, W, Ta, Hf, One or more elements selected from Ti, V, Cr, Mn, Y, Pd, Ru, Ga, Ge, C, and P. x represents an atomic ratio, and a, b, c, and d represent atomic%. And 0 ≦ x ≦ 0.5, 0 ≦ a ≦ 24, 1 ≦ b ≦ 20, 4 ≦ c ≦ 30, and 0 ≦ d ≦ 10, respectively.

Desirably, the following general formula A, B, C, D, and the nanocrystalline magnetic metal powder powder is desirable expressed by 5 Street E.

The general formula A is (Fe 1-x M x ) 100-a-b-c-D Si a Al b B c M ′ d (wherein M is Co and / or Ni, M ′ is Nb, Mo, Zr, W, Ta, Hf, Ti, V, Cr, Mn, Pd, Ru, Ge, C, P, and one or more elements selected from rare earth elements, where x is an atomic ratio, a, b, c , D represents atomic%, and 0 ≦ x ≦ 0.5, 0 ≦ a ≦ 24, 0.1 <b ≦ 20, 4 ≦ c ≦ 30, and 0 ≦ d ≦ 20, respectively. Composition.

The general formula B is (Fe 1-x M x ) 100-ab-c-d Cu a Si b B c M ′ d (wherein M is Co and / or Ni, M ′ is Nb, Mo, Zr, W, Ta, Hf, Ti, V, Cr, Mn, Pd, Ru, Ge, C, P, one or more elements selected from rare earth elements, where x is an atomic ratio, a, b, c , D represents atomic%, and satisfy 0 ≦ x ≦ 0.4, 0.1 ≦ a ≦ 3, b ≦ 19, 5 ≦ c ≦ 25, 0 <d ≦ 20, 15 ≦ b + c ≦ 30, respectively. The composition represented by

Formula C is, (Fe 1-x M x ) 100-a-b B a M 'b ( wherein, M is Co and / or Ni, M' is Nb, Mo, Zr, W, Ta, Hf, It represents one or more elements selected from Ti, V, Cr, Mn, Pd, Ru, Ga, Ge, C, and rare earth elements, x represents an atomic ratio, a and b represent atomic%, and 0 ≦ x, respectively. ≦ 0.5, 0 <a ≦ 20, 2 ≦ b ≦ 20).

The general formula D is (Fe 1-x M x ) 100-a-b-c P a M ′ b Cu c (wherein M is Co and / or Ni, M ′ is Nb, Mo, Zr, W, Ta, Hf, Ti, V, Cr, Mn, Pd, Ru, Ga, Ge, Al, C, and one or more elements selected from rare earth elements, where x is an atomic ratio, a, b, and c are atoms % are shown, Ru composition der represented by each 0 ≦ x ≦ 0.5,0 <shall meet a ≦ 20,2 ≦ b ≦ 20,0 ≦ c ≦ 3).

Formula E is, (Fe 1-x M x ) 100-a-b M 'a M "b ( wherein, M is Co and / or Ni, M' is Nb, Mo, Zr, W, Ta, Hf , Ti, V, Cr, Mn, Pd, Ru, Ga, Ge, Si, Al, P, Cu, and one or more elements selected from rare earth elements. M is selected from C, N, and O X represents an atomic ratio, a and b represent atomic%, and 0 ≦ x ≦ 0.5, 2 <a ≦ 30, and 4 ≦ b ≦ 30, respectively. Ru composition der to be.

Incidentally, in the magnetic metal powder of the above composition, impurities S such use is included in the base material in manufacturing magnetic metal powder in addition to these constituent elements is unavoidable.

Nanocrystal grains contained in the magnetic metal powder are 100 nm or less, desirably 50 nm or less, and more desirably 30 nm or less. Magnetic metal powder with a magnetic metal powder powder der Rukoto of nanograins, the improvement of soft magnetic characteristics such as coercive force decreases are observed. Experimentally, nanocrystal grains can be experimentally measured for X-ray diffraction, and the size of the crystal grains can be calculated from the half width of the diffraction peak.

(Amorphous magnetic metal powder used for weirs)
On the other hand, an amorphous magnetic metal powder are use to dam of the present invention, after the heat treatment is also maintained an amorphous structure, as the composition of the amorphous magnetic metal powder, but not restricted to, the general formula (Fe 1-x M x ) 100-abc Si a B b M ′ c (wherein M is Co and / or Ni, M ′ is Nb, Mo, Zr, W, Ta, Hf, Ti, V, Cr, 1 or more elements selected from Mn, Y, Pd, Ru, Ga, Ge, C, and P. x represents an atomic ratio, a, b, and c represent atomic%, and 0 ≦ x <1, 0 ≦ a ≦ 24, 4 ≦ b ≦ 30, and 0 ≦ c ≦ 10) are desirable. However, the present invention is not limited to this.

(Shape of magnetic metal powder used for weir)
The thickness of the magnetic metal powder are use to dam of the present invention, the particle size may Those having a thickness 5 [mu] m or less flat shape, more desirably, the thickness 5 [mu] m or less, desirably a particle diameter 300 [mu] m . More desirably, the thickness is 3 μm or less and the particle size is 200 μm or less.

The thickness of the magnetic metal powder are use to dam of the present invention, the particle size should preferably be those having a thickness 5 [mu] m or less of flat shape, a disk shape, spheroidal, spherical shape, needle shape, not it may be a fixed form but, desirable for thin magnetic metal powders such as the thickness is 5 [mu] m or less L value of the antenna, Ru improve the Q value.

Magnetic metal powder are use to dam of the present invention may be used flat magnetic metal powder described above alone may be used as a mixture with a magnetic metal powder of spherical shape or other shapes.

The method for producing magnetic metal powder of the present invention, wherein a metal having a desired composition is melted using a high-frequency melting furnace or the like, and a uniform melt is made to flow with an inert gas or the like. , by blowing a chill roll, after work made of amorphous magnetic metal strip obtained by rapid cooling, there is a method of obtaining a pulverizng powdered, a method of grinding a decrease in the magnetic properties by a stress during pulverization since easily occurs, direct method magnetic metal powder powder are obtained, such as a water atomizing method or the gas atomization method is preferable.

Magnetic metal powder are use to dam of the present invention, the amorphous magnetic metal powder, or nanocrystalline magnetic metal powder may be used alone, but by mixing the amorphous magnetic metal powder powder nanocrystalline magnetic metal powder Also good. Furthermore, other magnetic materials may be used in admixture with for example ferrite, sendust and the like.
(Resin used for weirs )
The purpose of the resin material used in forming type weir with a magnetic metal powder powder of the present invention includes an electrically insulating weir, a binder of powder magnetic metal powder. Examples of such materials include water-based glass and ceramics for inorganic materials, and various resins such as thermoplastic resins and thermosetting resins for organic materials. In particular, heat treatment at 200 ° C. or higher is required to improve magnetic properties. In such a case, mixing a heat-resistant resin that is thermoplastic and has a low elastic modulus is effective in achieving excellent performance.

Tree fat that is used in the molding of the weir of the present invention, because it may be heat treated at an optimal heat treatment temperature for improving the magnetic properties of the amorphous magnetic metallic ribbon used for the core material of the antenna, pyrolysis at the heat treatment temperature It is necessary to select a material with a small amount. The heat treatment temperature of the amorphous magnetic metal strip varies by magnetic properties of the composition beauty purposes of amorphous magnetic metal strip is in the range of temperature is generally 200 to 600 ° C. to express the good magnetic properties, more preferably in the range of 30 0 to 500 ° C..

The tree fat that is used in the molding of the weir of the present invention, mention may be made of thermoplastic, non-thermoplastic, a thermosetting heat-resistant resin. Among these, it is preferable to use a thermoplastic heat-resistant resin. The thermoplastic of the heat-resistant resin has a glass transition temperature Tg is well 50 ° C. or higher 420 ° C. or less, in a further, preferably, the glass transition temperature Tg is good those 60 ° C. or higher 350 ° C. or less. More preferably, the glass transition temperature Tg is 100 ° C. or higher and 300 ° C. or lower.

By using a resin having these properties, no tackiness at room temperature, also because of its stability, handling is simple, there is a merit that work property can be improved improved yield of the process.

The anti Netsuju fats are use in the molding of the weir of the present invention, pre-treatment subjected to 4 hours drying at 120 ° C. as subsequently under a nitrogen atmosphere, 300 DTA-TG weight loss rate when held for 2 hours at ° C. 1% or less, preferably 0.5% or less is used when measured using Specific resins include polyimide resins, silicon-containing resins, ketone resins, polyamide resins, liquid crystal polymers, nitrile resins, thioether resins, polyester resins, arylate resins, sulfone resins, imide resins, Examples thereof include amidoimide resins. Of these polyimides, Sa sulfone-based resin, to use an amide-imide resin.

In the present invention, when there is no need to heat treatment at 200 ° C. temperature above the magnetic metal material used for the core material and the dam of the antenna, but not limited to, a thermoplastic resin used in the present invention is specifically if mentioned, polyether sulfone, polyether imide, polyether ketone, polyethylene terephthalate, nylon, polybutylene terephthalate, polycarbonate, polyphenylene ether, polyphenylene sulfide, polysulfone, polyamide, polyamideimide, polylactic acid, polyethylene, polypropylene or the like the case, among this, desirably, polyether sulfone, polyether imide, polyether ketone, polyethylene, polypropylene, epoxy resin, silicone resin, rubber resin (chloroprene rubber, silicone rubber) It can be used.

(Weir molding method )
As molding methods of the weir of the present invention, the magnetic metal powder, or a method of kneading a resin powder, a method of e Ttopuresu after the magnetic metal powder and resin powder are mixed dry without solvent, dimethylacetamide dissolved organic solvent to the resin, such as, a paste work made by mixing magnetic metal powder, and a method of molding the dam dried in the mold. Among these, a resin Powder magnetic metal powder mixed with dry, it is preferable to mold the weir in a manner that a direct hot pressing.

Compounding ratio of the weir of the magnetic metal powder and a resin of the present invention preferably is preferably used as the magnetic metal powder is 5 to 6 0 vol% of the weir, it is more preferably used 1 0 to 30 vol% preferably preferably further preferably used 1. 5 to 25 vol%. It has been found that the L value Q value of the antenna, which is the effect of the present invention, can be significantly improved when the mixing ratio of the weir is within this range.
After mixing the material forming the weir , shape processing is performed so that it can be added to the core material of the antenna. Forming type method, if the material forming the weir of pellets is preferably injection molding type or extrusion forming type. Moreover, in the case of the mixed powder which does not contain a solvent, methods, such as a hot press, are mentioned. Injection molding type or an extrusion forming mold preferred because it can manufacture at low cost in mass production.

The core material of the antenna is an amorphous magnetic metal ribbon having a composition of Co 66 Fe 4 Ni 1 (BSi) 29 (atomic%) having a width of about 50 mm and a thickness of about 15 μm, manufactured by Honeywell, Metglas: 2714A (trade name). It was used. The surface of one surface of the ribbon is measured with an E-type viscometer (25 ° C), a polyamic acid solution having a viscosity of about 0.3 Pa · s is applied, dried at 140 ° C, cured at 260 ° C, and the amorphous magnetic metal thin film A heat resistant resin (polyimide resin) having a thickness of about 6 μm was applied to one side of the band. Polyimide resin is prepared by mixing 3,3′-diaminodiphenyl ether and 3,3 , 4,4′-biphenyltetracarboxylic dianhydride at a ratio of 1: 0.98 and shrinking at room temperature in a dimethylacetamide solvent. It was obtained by polymerization. Usually, it is used as a diacetylamide solution as a polyamic acid.
The amorphous magnetic metal strip that is applied to one surface of the polyimide resin, Ri by the thermally pressed at 40 sheets stacked in 30 minutes 5MPa at 260 ° C. in atmosphere pressure, to produce a laminate having a thickness of 1.0 mm. This in order expressing the magnetic properties further pressurized in 400 ° C. 1hr nitrogen atmosphere, heated, and the length 15 mm, width 1mm, core material 1mm thick antenna by Dicer.

Next, a method for producing the weir will be described. Weir is manufactured by mixing magnetic metal powder powder and resin powder powder.
Magnetic metal powder weekend alloy composition of Fe 66 Ni 4 Si 14 B 9 Al 4 Nb 3 a melt of 1300 ° C. in a high frequency melting furnace, passed down the melt through a nozzle mounted in the bottom of the melting furnace, ahead of the nozzle The molten metal is atomized with a high pressure gas of 75 kg / cm 2 from the attached gas atomizing part, and this atomized molten metal is further collided with a rotating cooling body having a roll diameter of 190 mm, a cone angle of 80 degrees, and a rotational speed of 7200 rpm, and an average major axis of 150 μm It was prepared average minor diameter 55 [mu] m, the flat magnetic metal powder powder having an average thickness of 2 [mu] m.
Result of measuring the X-ray diffraction before the heat treatment of the fine magnetic metal powder, magnetic metal powder powder shows a typical Amorufu § scan halo pattern, it was confirmed that the fully amorphous. Obtained magnetic metal powder powder was subjected to 1 hour heat treatment at 580 ° C.. Result of measuring the X-ray diffraction after heat treatment of the magnetic metal powder powder, magnetic metal powder powder after heat treatment are finely crystallized, it was confirmed that fine crystals of approximately 20nm is deposited from the half bandwidth of the diffraction peak It was.

Polyethersulfone (hereinafter referred to as PES) (Mitsui Chemicals) powder was used as a resin for producing the weir. Pellets of PES was ground in a ball mill to prepare a powder having a particle size of 100 mu m of the PES. The resulting nanocrystalline magnetic metal powder powder of 20 vol%, a mixture of powder 80 vol% of said PES as a binder, and stirred for 10 minutes at a hybrid mixer (Keyence Corp.), and the magnetic properties Powder A uniform mixed powder made of resin was obtained.

Next, this mixed powder was hot-pressed at 300 ° C. and 15 MPa for 10 minutes to produce a composite sheet having a thickness of 4 mm. Thereafter, it was molded into 3 × 3 × 4 mm blocks using an NC machine tool. Furthermore, the hole which penetrates the core material of a 1 * 1 mm antenna was provided in the center part.

The weir prepared by this method was fitted to both ends of the core material of the antenna prepared previously, and then a polyurethane-coated copper wire having a diameter of 0.1 mm was wound for 600 turns.

In order to evaluate antenna characteristics , L value and Q value were measured and relative permeability was calculated. For the measurement, an LCR meter 4024A manufactured by Hewlett-Packard Company was used . The results are shown in the table below. As a result, it was found that the antenna of Example 1 according to the present invention can greatly improve the magnetic characteristics as compared with the prior art.

This example differs from Example 1 only in that the shape of the magnetic metal powder constituting the weir is spherical. The method for manufacturing a magnetic metal powder of spherical, and 1300 ° C. in the melt in a high frequency melting furnace in the same manner as the composition of the magnetic metal powder is Fe 66 Ni 4 Si 1 4 B 9 Al 4 Nb 3 alloy as in Example 1, dissolved The molten metal is caused to flow down through a nozzle attached to the bottom of the furnace, and the molten metal is atomized with a high-pressure gas of 75 kg / cm 2 from a gas atomizing portion attached to the tip of the nozzle. Without collision to the rotating cooling body unlike the case in Example 1, cooled to a solid reduction, the magnetic metal powder powder spherical. Other than that, an antenna was manufactured by using the same materials and processes as in Example 1.

In order to evaluate antenna characteristics , L value and Q value were measured and relative permeability was calculated. For the measurement, an LCR meter 4024A manufactured by Hewlett-Packard Company was used . The results are shown in the table below. As a result, it was found that the antenna of Example 2 according to the present invention can greatly improve the magnetic characteristics as compared with the prior art .

Comparative example

The ratio Comparative Examples of the present invention, as in Example 1, different injuries but construction materials of the dam. Otherwise the same material as in Example 1 to prepare an antenna in beauty step. The Φ0.1 mm polyurethane-coated copper wire was wound by 670 turns.

In order to evaluate antenna characteristics , L value and Q value were measured and relative permeability was calculated. For the measurement, an LCR meter 4024A manufactured by Hewlett-Packard Company was used . The results are shown in the table below.










It is a figure which shows the structure which is 1 aspect of the structure of the antenna of this invention.

It is a figure which shows the structure which is another aspect of the structure of the antenna of this invention.

It is a figure which shows the structure of the antenna of a prior art .

Explanation of symbols

11 Core material of antenna 12 Weir 13 Conductive wire covered with wound insulating material

Claims (11)

  1. Conductive wire coated with an insulating material on the core material is wound, an antenna weir that provided in the end regions conductive wire is wound, the core material is amorphous magnetic metal antenna a core material obtained by laminating a thin strip, and weir to the amorphous magnetic metal powder or nanocrystalline magnetic metal powder, the weir der Rukoto formed from a resin and features.
  2. The core material, the antenna according to claim 1, characterized in core der Rukoto formed by laminating the amorphous magnetic metal strip and the resin alternately.
  3. The core material, the antenna according to claim 1, characterized in core der Rukoto formed by laminating the amorphous magnetic metal strip and heat-resistant resin alternately.
  4. It said weir, the claims 1 to 3 antenna according to the 5~60Vol% of amorphous magnetic metal powder or nanocrystalline magnetic metal powder, characterized that you have been formed from 95~40Vol% of resin.
  5. 5. The antenna according to claim 1, wherein the amorphous magnetic metal powder or nanocrystalline magnetic metal powder forming the weir is a flat magnetic metal powder .
  6. The amorphous magnetic metal ribbon constituting the core material is a Co-based amorphous magnetic metal ribbon, F e-type amorphous magnetic metal ribbon or one or more amorphous magnetic metal ribbons The antenna according to claim 1, wherein:
  7. The amorphous magnetic metal ribbon constituting the core material has a general formula (Co 1-c Fe c ) 1-a- b X a Y b (Wherein X is at least one element selected from Si, B, C, Ge) Y represents Zr, Nb, Ti, Hf, Ta, W, Cr, Mo, V, Ni, P, Al, P at least one selected from t, Rh, Ru, Sn, Sb, Cu, Mn, and rare earth elements Represented by the above elements. c, a, and b are 0 ≦ c ≦ 0.2, 10 <a ≦ 35, and 0 ≦ b, respectively. ≦ 30, wherein a and b are atomic magnetic metal strips) The antenna according to claim 1.
  8. 8. The resin according to claim 2, wherein the resin constituting the core material is a polyimide resin. Antenna.
  9. The weir has the general formula (Fe 1-x M x ) 100-ab-cd Si a Al b B c M ’ d ( Where M is Co and / or Ni, M ′ is Nb, Mo, Zr, W, Ta, Hf, Ti, V, Represents one or more elements selected from Cr, Mn, Y, Pd, Ru, Ga, Ge, C, P . x represents an atomic ratio, a, b, c, and d represent atomic%, and 0 ≦ x ≦ 0.5 and 0 ≦ a ≦ 2 respectively. 4, 1 ≦ b ≦ 20, 4 ≦ c ≦ 30, 0 ≦ d ≦ 10), general formula (Fe 1 -X M x ) 100-ab-cd Si a Al b B c M ’ d (Wherein M is Co and / or Ni and M ′ are Nb, Mo, Zr, W, Ta, Hf, Ti, V, Cr, Mn, Pd, Ru, One or more elements selected from Ge, C, P, and rare earth elements are represented. x is the atomic ratio, a, b, c and d represent atomic%, and 0 ≦ x ≦ 0.5, 0 ≦ a ≦ 24, and 0.1 <b ≦ 20, respectively. 4 ≦ c ≦ 30, 0 ≦ d ≦ 20), general formula (Fe 1-x M x ) 100 -Abc-d Cu a Si b B c M ’ d (Wherein M is Co and / or Ni, M ′ is Nb , Mo, Zr, W, Ta, Hf, Ti, V, Cr, Mn, Pd, Ru, Ge, C, P, rare It represents one or more elements selected from earth elements. x is atomic ratio, a, b, c, d are atomic% 0 ≦ x ≦ 0.4, 0.1 ≦ a ≦ 3, b ≦ 19, 5 ≦ c ≦ 25, 0 <d ≦ 20, 15 ≦ b + c ≦ 30), general formula (Fe 1-x M x ) 100-a -B B a M ’ b (Wherein M is Co and / or Ni, M ′ is Nb, Mo, Zr, W, Ta, 1 selected from Hf, Ti, V, Cr, Mn, Pd, Ru, Ga, Ge, C, and rare earth elements Represents more than one kind of element. x represents an atomic ratio, a and b represent atomic%, and 0 ≦ x ≦ 0.5, respectively. , 0 <a ≦ 20, 2 ≦ b ≦ 20), general formula (Fe 1-x M x ) 100 -Abc P a M ’ b Cu c (Wherein M is Co and / or Ni, M ′ is Nb, Mo, Z r, W, Ta, Hf, Ti, V, Cr, Mn, Pd, Ru, Ga, Ge, Al, C, rare earth One or more kinds of elements selected from similar elements are represented. x is atomic ratio, a, b, and c are atomic% 0 ≦ x ≦ 0.5, 0 <a ≦ 20, 2 ≦ b ≦ 20, and 0 ≦ c ≦ 3, respectively. Or general formula (Fe 1-x M x ) 100-ab M ’ a M ” b Where M is Co and / Or Ni, M 'is Nb, Mo, Zr, W, Ta, Hf, Ti, V, Cr, Mn, Pd, One or more elements selected from Ru, Ga, Ge, Si, Al, P, Cu and rare earth elements To express. M ″ represents one or more elements selected from C, N, and O. x is an atomic ratio, a and b are Atomic%, and 0 ≦ x ≦ 0.5, 2 <a ≦ 30, 4 ≦ b ≦ 30, respectively The weir formed using a nanocrystalline magnetic metal powder represented by The antenna according to claim 1.
  10. The weir has a general formula (Fe 1-x M x ) 100-a-b-c Si a B b M ′ c (where M is Co and / or Ni, M ′ is Nb, Mo, Zr, W , Ta, Hf, Ti, V, Cr, Mn, Y, Pd, Ru, Ga, Ge, C, and P represent one or more elements, where x is an atomic ratio, and a, b, and c are atoms. %, Each satisfying 0 ≦ x <1, 0 ≦ a ≦ 24, 4 ≦ b ≦ 30, and 0 ≦ c ≦ 10). antenna of claim 1-8, wherein the certain.
  11. The weir is polyimide resin, silicon-containing resin, ketone resin, polyamide resin, liquid crystal Polymer, nitrile resin, thioether resin, polyester resin, arylate tree A small number selected from the group consisting of fat, sulfone resin, imide resin, and amideimide resin The above-mentioned claims 1 to 10, which are weirs formed using at least one kind of resin. Antenna.
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