JPH0231882B2 - - Google Patents
Info
- Publication number
- JPH0231882B2 JPH0231882B2 JP56192132A JP19213281A JPH0231882B2 JP H0231882 B2 JPH0231882 B2 JP H0231882B2 JP 56192132 A JP56192132 A JP 56192132A JP 19213281 A JP19213281 A JP 19213281A JP H0231882 B2 JPH0231882 B2 JP H0231882B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic core
- laminated
- plastic film
- permeability
- 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.)
- Expired - Lifetime
Links
- 230000035699 permeability Effects 0.000 claims description 13
- 239000002985 plastic film Substances 0.000 claims description 12
- 229920006255 plastic film Polymers 0.000 claims description 12
- 239000000696 magnetic material Substances 0.000 claims description 11
- 238000010030 laminating Methods 0.000 claims description 4
- 238000004804 winding Methods 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 239000006247 magnetic powder Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 229910018605 Ni—Zn Inorganic materials 0.000 description 1
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000002651 laminated plastic film Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- ILJSQTXMGCGYMG-UHFFFAOYSA-N triacetic acid Chemical compound CC(=O)CC(=O)CC(O)=O ILJSQTXMGCGYMG-UHFFFAOYSA-N 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
- H01Q7/08—Ferrite rod or like elongated core
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F2017/0053—Printed inductances with means to reduce eddy currents
Landscapes
- Coils Or Transformers For Communication (AREA)
- Details Of Aerials (AREA)
Description
【発明の詳細な説明】
本発明は、ラジオ受信機等のように電磁波を受
信することを目的とした通信装置のアンテナに関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an antenna for a communication device, such as a radio receiver, for receiving electromagnetic waves.
従来、ラジオ受信機等のアンテナとしては、フ
エライトの角材や円柱材を磁心としたものが多く
用いられている。これらの磁心は、十分な誘起電
力を得るために大きな体積を必要とし、受信機内
において多大な容積を占有している。また衝撃に
より割れやすく、実装時において磁心にかかる衝
撃を吸収する措置を必要としていた。 Conventionally, as antennas for radio receivers and the like, antennas whose magnetic cores are made of square or cylindrical ferrite materials have often been used. These magnetic cores require a large volume to obtain sufficient induced power and occupy a large volume within the receiver. In addition, it is easily broken by impact, requiring measures to absorb the impact applied to the magnetic core during mounting.
本発明は以上のような欠点を解消するために、
高透磁率材を被覆したプラスチツクフイルムを積
層して磁心を構成し、フレキシブルで破損しにく
く、かつ高い実効透磁率で低損失な磁心を備えた
磁心入りループアンテナを提供することを目的と
している。 In order to eliminate the above-mentioned drawbacks, the present invention has the following features:
The object of the present invention is to provide a loop antenna with a magnetic core that is flexible, hard to break, and has a magnetic core with high effective permeability and low loss, in which the magnetic core is formed by laminating plastic films coated with a high magnetic permeability material.
以下、本発明を図面に添つて詳細に説明する。
第１図は本発明に係る高透磁率の磁性体を被覆し
たプラスチツクフイルムの一実施例を示した斜視
図であり、１は磁性体層であり、２はプラスチツ
クフイルムである。磁性体層１の磁性材料として
は、透磁率μが大きく、抗磁力Hcが小さなもの
がよく、Mn−Zn系やNi−Zn系のフエライト等
が適している。また、パーマロイやアモルフアス
磁性材等の金属磁性材料を使用することも可能で
ある。製造方法としては、従来の磁気テープと同
様に磁性粉の三酢化綿等のバインダーを浸入して
プラスチツクフイルム２に塗布して磁性体層１を
形成する方法や、プラスチツクフイルム２に磁性
体層１を蒸着またはスパツタリングする方法等が
あり、いずれにおいても製造可能である。第２図
は本発明に係る磁心入りループアンテナの一実施
例を示した斜視図である。３は第１図に示した高
透磁率の磁性体を被覆したプラスチツクフイルム
を積層して構成した積層磁心であり、４は同調コ
イルである。構造は従来のフエライトバーアンテ
ナと同様に、同調コイル４に積層磁心３を挿入し
たものである。このアンテナに誘起される電力も
従来のフエライトバーアンテナと同様に第１式で
示すことができる。 Hereinafter, the present invention will be explained in detail with reference to the drawings.
FIG. 1 is a perspective view showing an embodiment of a plastic film coated with a high permeability magnetic material according to the present invention, where 1 is a magnetic layer and 2 is a plastic film. The magnetic material for the magnetic layer 1 preferably has a large magnetic permeability μ and a small coercive force Hc, such as Mn-Zn ferrite or Ni-Zn ferrite. It is also possible to use metal magnetic materials such as permalloy and amorphous magnetic materials. The manufacturing method includes a method in which magnetic powder is infiltrated with a binder such as cotton triacetate and applied to the plastic film 2 to form the magnetic layer 1, similar to conventional magnetic tape, and a method in which the magnetic layer 1 is formed by applying the magnetic powder to the plastic film 2. There are methods such as vapor deposition or sputtering of 1, and production is possible by either method. FIG. 2 is a perspective view showing an embodiment of a loop antenna with a magnetic core according to the present invention. Reference numeral 3 designates a laminated magnetic core constructed by laminating plastic films coated with a high permeability magnetic material as shown in FIG. 1, and 4 designates a tuning coil. The structure is similar to the conventional ferrite bar antenna, in which a laminated magnetic core 3 is inserted into a tuning coil 4. The power induced in this antenna can also be expressed by the first equation as in the conventional ferrite bar antenna.
PαS・μe・Qe …(1)
第１式においてＰは誘起電力、Ｓは積層磁心３
の断面積、μeは積層磁心３の実効透磁率、Qeは
同調回路の実効Ｑである。 PαS・μe・Qe...(1) In the first equation, P is the induced power and S is the laminated magnetic core 3
, μe is the effective magnetic permeability of the laminated magnetic core 3, and Qe is the effective Q of the tuned circuit.
積層磁心３の実効透磁率μeは、第１図におけ
る磁性体層１が高透磁率材料であり、かつ第２図
における積層磁心３の形状を細長く、偏平にする
ことにより大きな値を得ることができる。また同
調回路の実効ＱであるQeに寄与する磁心のうず
電流損は、積層磁心３が極めて薄い磁性体を電気
的な絶縁をプラスチツクフイルム２で施しながら
積層した構造であり非常に少ない。またこのこと
が、うず電流損の大きな高透磁率の磁性体を使用
できる所以でもある。したがつて本発明の磁心入
りループアンテナは、高い周波数帯においても損
失が少なく、かつ実効透磁率の大きな磁心が得ら
れるとともに、磁心の構造がフイルムを積層した
ものでありフレキシブル可が可能である。さらに
同調コイル４は、ワイヤーを巻き回す以外にプリ
ント線を巻くことでも製作可能である。第３図は
本発明に係る磁心入りループアンテナを携帯時計
のバンドに応用した一実施例を示した一部切りか
きを有する斜視図である。占有容積の極て小さな
携帯時計に受信機能を備えることは非常に困難で
あり、特に効率のよいアンテナを提供することが
困難であつた。そこで本発明による磁心入りルー
プアンテナの特徴であるフレキシブルで薄型化が
容易であることをバンドに応用することで解決で
きるようになつた。第３図における３は積層磁
心、４は同調コイルであり、第２図に示した積層
磁心３と同調コイル４とそれぞれ同様のものであ
り、同一の番号を使用した。５はバンドの外皮、
６は時計体である。同調コイル４に積層磁心３を
挿入した磁心入りループアンテナを薄くかつ細長
く構成しさらにウレタンゴム等を被覆して外皮５
を構成すればバンドの機能とアンテナの機能を十
分に兼用でき、時計体６の内部に設置した受信回
路と同調コイル４とを接続することにより実用的
な受信機能を携帯時計に付加できる。 The effective magnetic permeability μe of the laminated magnetic core 3 can be obtained to a large value by making the magnetic layer 1 in FIG. 1 a high permeability material and by making the shape of the laminated magnetic core 3 in FIG. 2 elongated and flat. can. Further, the eddy current loss of the magnetic core that contributes to Qe, which is the effective Q of the tuning circuit, is extremely small because the laminated magnetic core 3 has a structure in which extremely thin magnetic materials are laminated with electrical insulation provided by the plastic film 2. This is also the reason why a high permeability magnetic material with large eddy current loss can be used. Therefore, the loop antenna with a magnetic core of the present invention has a magnetic core with low loss and high effective magnetic permeability even in high frequency bands, and the magnetic core structure is made of laminated films, so it can be made flexible. . Further, the tuning coil 4 can be manufactured not only by winding a wire but also by winding a printed wire. FIG. 3 is a partially cutaway perspective view showing an embodiment in which the loop antenna with a magnetic core according to the present invention is applied to a watch band. It is extremely difficult to provide a reception function to a portable watch that occupies an extremely small volume, and it has been particularly difficult to provide an efficient antenna. Therefore, it has become possible to solve this problem by applying the features of the loop antenna with a magnetic core according to the present invention, which are flexible and easy to reduce in thickness, to a band. In FIG. 3, 3 is a laminated magnetic core, and 4 is a tuning coil, which are similar to the laminated magnetic core 3 and tuning coil 4 shown in FIG. 2, and the same numbers are used. 5 is the outer skin of the band,
6 is a clock body. A loop antenna with a magnetic core in which a laminated magnetic core 3 is inserted into a tuning coil 4 is constructed thin and long, and is further coated with urethane rubber etc. to form an outer skin 5.
By configuring this, the function of the band and the function of the antenna can be sufficiently combined, and by connecting the receiving circuit installed inside the watch body 6 and the tuning coil 4, a practical receiving function can be added to the portable watch.
以上のように本発明によれば、高透磁率の磁性
体を被覆したプラスチツクフイルムを積層するこ
とにより、フレキシブルな磁心を提供でき、かつ
積層する枚数を任意に選択することにより磁心の
形状（厚さ）を自由に設定できる。また、実効透
確率を大きく、かつ損失を小さく（Ｑを大きく）
できるため効率のよい磁心入りループアンテナを
提供できる。さらに、薄型でフレキシブルであ
り、かつ破損しにくい特性を生かし、携帯時計の
バンドに応用したり、超小型・超薄型の受信機の
アンテナとして使用できるなど多くの優れた効果
を有するものである。 As described above, according to the present invention, a flexible magnetic core can be provided by laminating plastic films coated with a magnetic material with high magnetic permeability, and the shape (thickness) of the magnetic core can be provided by arbitrarily selecting the number of laminated plastic films. ) can be set freely. Also, increase the effective penetration probability and decrease the loss (increase Q)
This makes it possible to provide an efficient loop antenna with a magnetic core. Furthermore, it is thin, flexible, and hard to break, so it has many excellent effects, such as being able to be used as a watch band for a mobile phone, or as an antenna for an ultra-compact and ultra-thin receiver. .
第１図は本発明に係る高透磁率の磁性体を被覆
したプラスチツクフイルムの一実施例を示した斜
視図、第２図は本発明に係る磁心入りループアン
テナの一実施例を示した斜視図、第３図は本発明
を携帯時計のバンドに応用した一実施例を示した
一部切りかきを有する斜視図である。
１……磁性体層、２……プラスチツクフイル
ム、３……積層磁心、４……同調コイル、５……
バンドの外皮、６……時計体である。
FIG. 1 is a perspective view showing an embodiment of a plastic film coated with a high magnetic permeability magnetic material according to the present invention, and FIG. 2 is a perspective view showing an embodiment of a loop antenna with a magnetic core according to the present invention. FIG. 3 is a partially cutaway perspective view showing an embodiment in which the present invention is applied to a watch band. 1... Magnetic layer, 2... Plastic film, 3... Laminated magnetic core, 4... Tuning coil, 5...
The outer skin of the band, 6... is the watch body.
Claims (1)
体を被覆したプラスチツクフイルムと、前記磁性
体のプラスチツクフイルムを積層してなる磁心
と、該磁心に線を巻き回してなる同調コイルとか
らなり、携帯時計のバンドとしてバンドの外皮に
よつて一体に構成されたことを特徴とする磁心入
りループアンテナ。1. A receiver antenna consists of a plastic film coated with a magnetic material with high magnetic permeability, a magnetic core formed by laminating the plastic film of the magnetic material, and a tuning coil formed by winding a wire around the magnetic core. A loop antenna with a magnetic core, characterized in that it is integrally formed with the outer skin of a watch band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19213281A JPS5894204A (en) | 1981-11-30 | 1981-11-30 | Loop antenna containing magnetic core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19213281A JPS5894204A (en) | 1981-11-30 | 1981-11-30 | Loop antenna containing magnetic core |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5894204A JPS5894204A (en) | 1983-06-04 |
| JPH0231882B2 true JPH0231882B2 (en) | 1990-07-17 |
Family
ID=16286206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19213281A Granted JPS5894204A (en) | 1981-11-30 | 1981-11-30 | Loop antenna containing magnetic core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5894204A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02131955U (en) * | 1989-04-10 | 1990-11-01 |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6157704U (en) * | 1984-09-19 | 1986-04-18 | ||
| JPS63171015U (en) * | 1987-04-24 | 1988-11-08 | ||
| US5465098A (en) * | 1991-11-05 | 1995-11-07 | Seiko Epson Corporation | Antenna apparatus for transceiver |
| US5589840A (en) * | 1991-11-05 | 1996-12-31 | Seiko Epson Corporation | Wrist-type wireless instrument and antenna apparatus |
| US5532705A (en) * | 1993-03-17 | 1996-07-02 | Seiko Epson Corporation | Wrist-mounted-type antenna device and apparatus having the antenna device |
| US5757326A (en) * | 1993-03-29 | 1998-05-26 | Seiko Epson Corporation | Slot antenna device and wireless apparatus employing the antenna device |
| JP3417083B2 (en) * | 1994-10-04 | 2003-06-16 | セイコーエプソン株式会社 | Portable radio |
| KR100459839B1 (en) * | 1995-08-22 | 2005-02-07 | 미쓰비시 마테리알 가부시키가이샤 | Antennas and transponders for transponders |
| US6014111A (en) * | 1997-06-05 | 2000-01-11 | Megapulse, Inc. | Ferrite crossed-loop antenna of optimal geometry and construction and method of forming same |
| JP2002290131A (en) * | 2000-12-18 | 2002-10-04 | Mitsubishi Materials Corp | Antenna for transponder |
| JP2005136689A (en) * | 2003-10-30 | 2005-05-26 | Alpha Corp | Antenna |
| US7038634B2 (en) | 2004-07-02 | 2006-05-02 | Eta Sa Manufacture Horlogère Suisse | Optimization of a loop antenna geometry embedded in a wristband portion of a watch |
| US7162217B2 (en) | 2004-07-02 | 2007-01-09 | Eta Sa Manufacture Horlogère Suisse | Interconnection circuit between two loop antennas embedded in a wristband of a wrist-carried wireless instrument |
-
1981
- 1981-11-30 JP JP19213281A patent/JPS5894204A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02131955U (en) * | 1989-04-10 | 1990-11-01 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5894204A (en) | 1983-06-04 |
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