JPH09284038A - Antenna equipment of non-contact data carrier - Google Patents

Antenna equipment of non-contact data carrier

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Publication number
JPH09284038A
JPH09284038A JP12096996A JP12096996A JPH09284038A JP H09284038 A JPH09284038 A JP H09284038A JP 12096996 A JP12096996 A JP 12096996A JP 12096996 A JP12096996 A JP 12096996A JP H09284038 A JPH09284038 A JP H09284038A
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JP
Japan
Prior art keywords
loop antenna
soft magnetic
antenna
magnetic body
effective
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.)
Pending
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JP12096996A
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Japanese (ja)
Inventor
Masayuki Miura
Akira Otake
雅之 三浦
朗 大竹
Original Assignee
Nhk Spring Co Ltd
日本発条株式会社
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Application filed by Nhk Spring Co Ltd, 日本発条株式会社 filed Critical Nhk Spring Co Ltd
Priority to JP12096996A priority Critical patent/JPH09284038A/en
Publication of JPH09284038A publication Critical patent/JPH09284038A/en
Application status is Pending legal-status Critical

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Abstract

PROBLEM TO BE SOLVED: To keep the communication distance of a non-contact data carrier to be stable regardless of the arrangement place of an antenna equipment and also to promote more thinning in the antenna equipment by adjacently arranging a soft magnetic body where an effective and magnetical permeability is more than a specified value at the rear surface of a loop antenna. SOLUTION: The loop antenna 1 is contained in a case 2 which is formed by a synthetic resin material, etc., where the effective and magnetic permeability is close to one. Then, the soft magnetic body 3 is arranged on the whole surface of the rear surface of the loop antenna 1. The effective and magnetic permeability when an exciting frequency band is equal to or below 100kHz is more than 100 in the soft magnetic body 3. The soft magnetic body 3 has the drastically high effective and magnetic permeability. When it is adjacently arranged on the rear surface of the loop antenna 1, an electromagnetic field in the rear part of the loop antenna 1 is drawn into the soft magnetic body 3. Therefore, the limitation of the arrangement place is drastically reduced.

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、非接触カードや非接触タグ等を用いた非接触データキャリアシステムに於けるリーダライタ側のアンテナ装置に関するものである。 The present invention relates to relates to an antenna device in a reader writer to the contactless data carrier system using a contactless card or a contactless tag or the like.

【0002】 [0002]

【従来の技術】近年、利用者が携帯する非接触力一ドに記憶された各種の情報を、電磁波を利用してリーダライタが非接触で読み出す非接触式データキャリアシステムが実用化されている。 In recent years, various kinds of information stored in the non-contact power one de the user carries, the reader writer by using electromagnetic waves non-contact data carrier system for reading in a non-contact has been practically . この非接触式データキャリアシステムに於いて、信号伝送手段には様々な方式があるが、 In this non-contact data carrier systems, the signal transmission means there are various schemes,
電磁誘導方式を用いた場合、リーダライタ側に使用されるアンテナ装置と非接触カードとの間で信号授受を行う周波数は、数百kHz以下の帯域にあり、アンテナの形式としてはループアンテナが用いられ、有効通信可能距離は、1m以内の比較的短い距離であることが一般的である。 When using an electromagnetic induction method, the frequency for signal transmission and reception between the antenna device and the non-contact card used in the reader writer side is in the following range several hundred kHz, the loop antenna is used as a form of antenna is the effective communication range, it is generally a relatively short distance within 1 m.

【0003】 [0003]

【発明が解決しようとする課題】さて、電磁誘導方式の非接触データキャリアシステムに用いられるループアンテナは、単体の状態で最適に調整した後、リーダライタ部に内蔵するか、或いはアンテナだけで別の筐体に収納するかして、建物施設の壁面、天井面、床面、或いはドア等に設置される。 [SUMMARY OF THE INVENTION Now, the loop antenna used in the contactless data carrier system of the electromagnetic induction method, after optimally adjusted alone state, or incorporated in the reader writer unit, or another only antenna and whether to accommodate of the housing, the wall of a building facility, the ceiling surface, is installed on the floor surface, or the door or the like. ところが、アンテナを設置するのに適した場所の付近には、鉄筋、鉄板、アルミニウム板、 However, in the vicinity of the place suitable for installing the antenna, rebar, iron, aluminum plate,
或いは信号ケーブル等の良導体からなる部材が存在しがちである。 Or is member made of a good conductor such as a signal cable tends to exist. こうした良導体部材がアンテナに近接して存在すると、ループアンテナから放射される電磁波用電力の一部が良導体表面に発生する渦電流等の影響で損失するため、通信距離が短くなり、極端な場合には、アンテナ面にカードを直接接触させるようにしなければ通信できないような場合もあり、アンテナ設置場所の条件に通信感度が大きく影響されるという問題があった。 If such conductor member is in close proximity to the antenna, a part of the electromagnetic wave power radiated from the loop antenna is lost due to the effect of such eddy current generated in the conductor surface, communication distance becomes short, in extreme cases is sometimes as it can not communicate unless so as to contact the card directly to the antenna surface, there is a problem that the communication on the condition of the antenna installation site sensitivity is greatly affected.

【0004】この対策として、特開平7−263936 [0004] As a countermeasure, JP-A-7-263936
号公報には、ループアンテナの背後に、空気層などの非磁性空間と、銅板、銀板、アルミニウム板等の非磁性体の導電部材とを配置し、その状態で最大の通信距離が得られるようにループアンテナを調整した上で、所望の場所に設置するようにした技術が提案されている。 The JP, behind the loop antenna, and a non-magnetic space such as an air layer, copper, silver plate, and a conductive member of the nonmagnetic material of the aluminum plate or the like is arranged, the maximum communication distance is obtained in that state on which a loop antenna is adjusted as a technique which is adapted to placed in a desired location have been proposed. しかしながらこの方式は、アンテナ設置場所の条件に左右されなくなる反面、直径約200mmの円形ループアンテナの場合、非磁性空間の間隔を20〜30mm以上とらなければならず、アンテナ装置の薄形化が阻害されるという問題があった。 However, this method, although no longer depend on the condition of the antenna location, a circular loop antenna having a diameter of approximately 200 mm, the distance between the non-magnetic space must be taken more than 20 to 30 mm, inhibition thinning of the antenna device there is a problem that is.

【0005】本発明は、このような従来技術の問題点を解消し、非接触データキャリアの通信距離をアンテナ装置の設置場所に左右されずに安定に保つことができ、しかもアンテナ装置のより一層の薄形化を推進し得る非接触データキャリアのアンテナ装置を提供することを目的とするものである。 [0005] The present invention is to solve the problems of the prior art, the communication distance of the non-contact data carrier can be kept to stably without being affected by the installation location of the antenna device, yet even more of the antenna device it is an object to provide a of the antenna device of the non-contact data carrier capable of promoting the thinning.

【0006】 [0006]

【課題を解決するための手段】本発明者らは、上記の公知形式に於ける非磁性体の高導電率材がループアンテナに近接することによって起きる電磁波の放射損失の多くは、高導電率材に発生する渦電流に起因するものと考え、この観点に立つと、低導電率材の方が好ましいのではないかと考えた。 Means for Solving the Problems The present inventors have found that many of the electromagnetic radiation loss caused by the above known formats in non-magnetic high conductivity material is close to the loop antenna, high conductivity considered to be caused by eddy current generated in the timber, and stood in this respect, it considered that it would be preferable towards the low conductivity material. その一方で、電磁波は電界と磁界とが表裏一体となって進行するものであるから、磁界で電磁波を制御できないものかと考えた。 On the other hand, the electromagnetic wave from one in which the electric field and the magnetic field progresses becomes inextricably linked, were considered or not can not control the electromagnetic waves in a magnetic field. 即ち、鉄板などの磁性部材よりも高い実効比透磁率(μeff)かつ低導電率の軟磁性材を、アンテナの放射を目的とする方向以外の側面に近接配置することにより、アンテナから放射される電磁波のうち、目的とする方向以外の側の電磁波を時間平均的に安定して予め吸収させる構成をとることで供給電力を調整すれば、鉄板などの磁性体が近づいても、そちら側には電磁界が吸収されなくなり、また、ケーブルから発生する電磁界は、高実効比透磁率材が吸収するのでアンテナ側へは影響しなくなり、安定した放射電磁界を確保できるようになると考えた。 That is, by the soft magnetic material of high effective relative permeability (.mu.eff) and low conductivity than the magnetic member such as iron plate, disposed close to the radiation of the antenna on a side surface other than the intended direction, is radiated from the antenna among the electromagnetic waves, by adjusting the supply power by a configuration in which pre-absorb electromagnetic waves on the side other than the direction of interest time average stable, even if a magnetic material such as iron plate close to that side is the electromagnetic field is no longer absorbed, also, the electromagnetic field generated from the cable, since the high effective relative permeability material absorbs no longer affect the antenna side, was considered to be possible to ensure a stable radiation field. そして鋭意検討の結果、上記の目的を果たすために、100kHz以下の励振周波数に於ける実効比透磁率が100以上の軟磁性体を、ループアンテナの背面に近接配置するものとした。 The result of intensive studies in order to fulfill the above object, in effective relative permeability to the excitation frequency below 100kHz is more than 100 soft magnetic material, and shall be arranged close to the back of the loop antenna.

【0007】 [0007]

【発明の実施の形態】以下に添付の図面を参照して本発明の構成を詳細に説明する。 DETAILED DESCRIPTION OF THE INVENTION detailed description of the structure of the present invention with reference to the accompanying drawings.

【0008】図1は、本発明による非接触データキャリアのアンテナ装置を示している。 [0008] Figure 1 shows an antenna device of a contactless data carrier according to the present invention. ループアンテナ1は、 Loop antenna 1,
その形状が矩形、或いは円形をなしており、導電率が十分に小さく、かつ実効比透磁率が1に近い合成樹脂材等で形成されたケース2内に収納されている。 Its shape is rectangular, or has a circular shape, conductivity is sufficiently small, and the effective relative permeability is accommodated near the synthetic resin material casing 2 formed by like one. そしてループアンテナ1の背面の全面には、軟磁性体3が配置されている。 And the entire surface of the back of the loop antenna 1, the soft magnetic body 3 is disposed. この軟磁性体3の形状は、矩形或いは円形など、ループアンテナ1の形状に応じて適宜に定めれば良い。 The shape of the soft magnetic body 3, such as a rectangular or circular, may be determined as appropriate according to the shape of the loop antenna 1.

【0009】ループアンテナ1は、ケース2の放射を目的とする方向の面に、アンテナ取付用ブラケット等(図示せず)を介して取り付けられている。 [0009] Loop antenna 1 in the direction of the surface for the purpose of radiation of the case 2 is attached via an antenna mounting bracket or the like (not shown). また軟磁性体3 The soft magnetic body 3
は、ループアンテナ1の放射を目的としない方向の面に接着するなどして固定されている。 It is fixed, such as by adhering to the surface in the direction not intended to emission of the loop antenna 1.

【0010】図2は、図1に示したアンテナ装置中のループアンテナ1と軟磁性体3との配置関係を示している。 [0010] Figure 2 shows the arrangement of the loop antenna 1 and the soft magnetic body 3 in the antenna device illustrated in FIG. 図2に示したように、ループアンテナ1の外周輪郭よりも大きな軟磁性体3をループアンテナ1の開口面の背面に配置するのが理想的であるが、ループアンテナ1 As shown in FIG. 2, although it is ideal to place a large soft magnetic body 3 than the outer peripheral edge of the loop antenna 1 on the back of the opening face of the loop antenna 1, the loop antenna 1
の開□面内に何らかの干渉物がある場合は、図3に示すように、干渉物を避けるように中央部をくり抜いた軟磁性体2をループアンテナ1の開口面の背後に配置すれば良い。 If there are any interferences in the open □ plane, as shown in FIG. 3, the soft magnetic body 2 hollowed out central portion so as to avoid interference thereof may be disposed behind the opening face of the loop antenna 1 . また、材料強度や構造上の問題で軟磁性体2をくり抜けない場合は、図4に示したように、軟磁性体2を複数の部材に分けてループアンテナ1の周方向に沿って適宜に配置すれば良い。 When there is no Kurinuke the soft magnetic body 2 in material strength and structural problems, as shown in FIG. 4, suitably along the circumferential direction of the loop antenna 1 is divided soft magnetic body 2 into a plurality of members it may be arranged to.

【0011】なお、ここでいう軟磁性体とは、適当に調整された動作磁界(励振周波数帯が100kHz以下) [0011] Here, the soft magnetic member according to, (hereinafter excitation frequency band 100kHz) suitably adjusted operating field
に於ける実効比透磁率(μeff)が100以上のものをいう。 In the effective relative permeability (μeff) is refers to more than 100 in. 低導電率については、実効比透磁率の規定で包含されるため、特に制限されない。 For low conductivity, for inclusion in a defined effective relative permeability it is not particularly limited.

【0012】軟磁性体3は、実効比透磁率が極めて高く、これをループアンテナ1の背面に近接配置すると、 [0012] The soft magnetic body 3, the effective relative permeability is very high, which upon juxtaposed with the back of the loop antenna 1,
ループアンテナ1後方の電磁界は軟磁性体3中に引き込まれる。 Loop antenna 1 back of the electromagnetic field are drawn into 3 soft magnetic material. また、この状態でアンテナ出力を調整することにより、アンテナ装置の背面に鉄筋、鉄板、アルミニウム板、或いは信号ケーブル等の良導体が存在する場合の影響を小さくすることができる。 Further, by adjusting the antenna output in this state, it is possible to reduce the effect of reinforcing bars to the back of the antenna device, iron, aluminum plate, or the good conductor such as signal cables are present.

【0013】一般に軟磁性体の保磁力は鉄板等に比べて小さく、ヒステリシス損失は小さい。 [0013] Generally the coercivity of the soft magnetic material is smaller than the iron plate or the like, the hysteresis loss is small. また電気抵抗の大きい軟磁性体を用いれば、軟磁性体表面を流れる渦電流はさらに小さくなる。 Also the use of the large soft magnetic material of the electrical resistance, the eddy current flowing through the soft magnetic material surface is further reduced. これを代表的な磁気特性値である実効比透磁率で表すと、実効比透磁率値が高いほどループアンテナ1に加えられた高周波電力の損失が少なくなり、アンテナ装置の背面に良導体が存在しても、アンテナ単体の場合とほぼ同じ通信距離が得られる。 Expressing this in effective relative permeability which is a typical magnetic characteristic values, the loss of high frequency power effective relative permeability value is applied as the loop antenna 1 high is reduced, there is a good conductor to the back of the antenna device be substantially the same communication distance as the case of the single antenna are obtained.

【0014】より好ましい軟磁性体材料としては、厚さ数mm程度のフェライト薄板または厚さ数10μm程度のアモルファスシートが考えられる。 Preferred soft magnetic material than [0014] is considered amorphous sheet of ferrite sheet or thickness having about 10μm thickness of about several mm. アモルファスシートを積層することで、アンテナ装置背面の建築部材に含まれた良導体の影響をさらに小さくできる。 By stacking the amorphous sheet, it can further reduce the influence of conductor included in the building elements of the antenna device back. また、適当な外部磁界を印加した不活性ガス中または窒素ガス中でアモルファスシートに摂氏数百度の熱処理を施すことにより、実効比透磁率がより一層増大し、通信距離を伸ばすことができる。 Further, by heat treatment of several hundred degrees centigrade in the amorphous sheet with a suitable external magnetic field inert gas was applied or nitrogen gas, the effective relative permeability is further increased, it is possible to extend the communication distance.

【0015】アンテナ装置を数百kHzの周波数で励振する場合には、その周波数帯域で高実効比透磁率を保持し得る軟磁性材料を用いればよく、この場合には、特にフェライトやアモルファス等が好ましい。 [0015] In the case of exciting the antenna device at a frequency of several hundred kHz may be used a soft magnetic material capable of retaining a high effective relative permeability in the frequency band, in this case, particularly ferrite or amorphous, etc. preferable. また、これよりも低い周彼数でアンテナ装置を励振する場合には、パーマロイ、珪素鋼、或いはセンダスト等の軟磁性材も利用可能である。 Further, in the case of exciting the antenna device at low circumferential he number than this, Permalloy, silicon steel, or a soft magnetic material such as sendust are also available.

【0016】本発明のアンテナ装置の動作電流を適当に調整できるならば、軟磁性体3が持つその時の最大実効比透磁率に合うように動作電流を調整すれば良い。 [0016] If the operating current of the antenna device of the present invention can be properly adjusted, may be adjusted operating current to match the maximum effective relative permeability at that time with the soft magnetic body 3.

【0017】図5は、ループアンテナ1単体の通信可能範囲を示しており、ループアンテナ1の前後に均等な通信可能範囲4が存在している。 [0017] Figure 5 illustrates a loop antenna 1 single communication range, uniform coverage area 4 around the loop antenna 1 is present.

【0018】図6は、本発明のアンテナ装置の通信可能範囲である。 [0018] FIG. 6 is a communication range of the antenna device of the present invention. 本発明のアンテナ装置によると、軟磁性体3の後方には、通信可能範囲がほとんど存在せず、ループアンテナ1の前面にのみ通信可能範囲4を得ることができる。 According to the antenna device of the present invention, in the rear of the soft magnetic body 3 may be communicable range hardly exist, obtain a communicable range 4 only in front of the loop antenna 1. 同図に示すように、アンテナ装置の背面側に鉄板5等の磁性体が存在する場合でも、通信可能範囲はほとんど変化しなかった。 As shown in the figure, even when the rear side iron plate 5 or the like magnetic material of the antenna device is present, the communication range is hardly changed.

【0019】 [0019]

【発明の効果】このように本発明によれば、ループアンテナの背面に軟磁性体を配置し、ループアンテナの誘導電磁界を軟磁性体中に引き込んだ状態でアンテナ出力を調整するようにしたため、アンテナ装置周辺に鉄筋、鉄板、アルミニウム板、或いは信号ケーブル等の良導体部材が存在しても、このループアンテナの開口面側への通信距離は変化しないものとなる。 Effects of the Invention According to the present invention, the soft magnetic material is disposed on the back of the loop antenna, because you to adjust the antenna output in a state in which retracted the induction field of the loop antenna in the soft magnetic material , rebar around the antenna device, iron, aluminum plates, or even the good conductor members such as the signal cable is present, the communication distance to the opening surface side of the loop antenna becomes unchanged. 従って、設置場所の制約を大幅に減らすことができる。 Therefore, it is possible to significantly reduce the constraints of the installation site. また本発明によれば、 According to the invention,
ループアンテナと軟磁性体とは接触させても何等支障がないので、アンテナ装置の薄形化を推進する上に大きな効果を奏し得る。 Since there is no any problem even by contact with the loop antenna and the soft magnetic material can achieve a significant effect on the promotion of thinning of the antenna device.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明によるアンテナ装置の全体構成図。 Overall configuration diagram of an antenna device according to the invention; FIG.

【図2】本発明の一実施例を示し、(A)は正面図であり、(B)は縦断面図である。 Figure 2 shows an embodiment of the present invention, (A) is a front view, (B) is a longitudinal sectional view.

【図3】本発明の第2実施例を示し、(A)は正面図であり、(B)は縦断面図である。 Figure 3 shows a second embodiment of the present invention, (A) is a front view, a (B) is a longitudinal sectional view.

【図4】本発明の第3実施例を示し、(A)は正面図であり、(B)は縦断面図である。 Figure 4 shows a third embodiment of the present invention, (A) is a front view, a (B) is a longitudinal sectional view.

【図5】ループアンテナ単体の通信可能範囲を示す概念図。 Figure 5 is a conceptual diagram showing a communication range of the loop antenna alone.

【図6】本発明によるアンテナ装置の通信可能範囲を示す概念図。 Conceptual diagram illustrating a communication range of an antenna device according to the present invention; FIG.

【符号の説明】 DESCRIPTION OF SYMBOLS

1 ループアンテナ 2 ケース 3 軟磁性体 4 通信可能範囲 5 鉄板 1 loop antenna 2 Case 3 soft magnetic 4 communicable range 5 iron

Claims (1)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 100kHz以下の励振周波数帯に於ける実効比透磁率が100以上の軟磁性体を、ループアンテナの背面に近接配置したことを特徴とする非接触データキャリアのアンテナ装置。 1. A 100kHz following excitation at the effective relative permeability of 100 or more soft magnetic material in the frequency band, the antenna device of the contactless data carrier, characterized in that arranged close to the back of the loop antenna.
JP12096996A 1996-04-17 1996-04-17 Antenna equipment of non-contact data carrier Pending JPH09284038A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12096996A JPH09284038A (en) 1996-04-17 1996-04-17 Antenna equipment of non-contact data carrier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12096996A JPH09284038A (en) 1996-04-17 1996-04-17 Antenna equipment of non-contact data carrier

Publications (1)

Publication Number Publication Date
JPH09284038A true JPH09284038A (en) 1997-10-31

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