JPH0583173A - Wireless communication device for data transmission - Google Patents
Wireless communication device for data transmissionInfo
- Publication number
- JPH0583173A JPH0583173A JP3240044A JP24004491A JPH0583173A JP H0583173 A JPH0583173 A JP H0583173A JP 3240044 A JP3240044 A JP 3240044A JP 24004491 A JP24004491 A JP 24004491A JP H0583173 A JPH0583173 A JP H0583173A
- Authority
- JP
- Japan
- Prior art keywords
- antenna coil
- battery
- communication device
- wireless communication
- metal
- 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
Links
- 238000004891 communication Methods 0.000 title claims abstract description 40
- 230000005540 biological transmission Effects 0.000 title claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims abstract description 15
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000005674 electromagnetic induction Effects 0.000 claims description 2
- 239000002184 metal Substances 0.000 abstract description 24
- 238000013459 approach Methods 0.000 abstract description 8
- 230000006870 function Effects 0.000 abstract description 6
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 230000002411 adverse Effects 0.000 abstract description 2
- 230000004907 flux Effects 0.000 description 6
- 230000007423 decrease Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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- Radar Systems Or Details Thereof (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
(57)【要約】
【目的】例えば移動物体識別装置の応答器を実施対象
に、高価なフェライトコア，金属シールド板を追加装備
することなく、金属物体の接近による通信機能への悪影
響を低減できるようにしたデータ伝送用無線通信機を提
供する。
【構成】応答器３のケース３７に組み込んだアンテナコ
イル３２, 同調コンデンサ３３，電源用電池３６，プリ
ント配線板３８の間で、電池３６をプリント配線板３８
に取付けてアンテナコイル３２の背面をカバーするよう
に並置配備し、かつこの組立状態で同調コンデンサ３
３，アンテナコイル３２の定数を所定の通信周波数で共
振するように調整する。これにより、電池３６の金属外
装がアンテナコイル３２の電磁シールドとして機能し、
応答器３に金属物体が近づいた際の金属影響を低減する
ことができる。
(57) [Abstract] [Purpose] For example, for a transponder of a moving object identification device, the adverse effect on the communication function due to the approach of a metal object can be reduced without additionally equipping an expensive ferrite core or a metal shield plate. A wireless communication device for data transmission is provided. [Structure] Between the antenna coil 32, the tuning capacitor 33, the power supply battery 36, and the printed wiring board 38 incorporated in the case 37 of the responder 3, the battery 36 is connected to the printed wiring board 38
Mounted side by side so as to cover the back surface of the antenna coil 32, and in this assembled state, the tuning capacitor 3
3. The constant of the antenna coil 32 is adjusted so that it resonates at a predetermined communication frequency. As a result, the metal exterior of the battery 36 functions as an electromagnetic shield for the antenna coil 32,
It is possible to reduce the influence of metal when a metal object approaches the transponder 3.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば無線交信方式の
移動物体識別システムに適用するデータ伝送用無線通信
機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication device for data transmission applied to, for example, a moving object identification system of a wireless communication system.
【０００２】[0002]
【従来の技術】昨今では、ＦＡの生産ラインでの製品，
組立部品に関する情報の管理システムとして、頭記した
無線交信方式の移動物体識別システムが普及されてい
る。この無線交信方式の移動物体識別システムは生産ラ
インの地上側に質問器を、ライン上の移動物体に応答器
を取付け、質問器と応答器との間で生産に関する管理デ
ータの読み取り，書き込みを行うようにしたものであ
り、質問器，応答器には電磁誘導，電磁結合などを通信
媒体としてデータの伝送を行う無線通信機が広く使用さ
れている。2. Description of the Related Art Nowadays, products on FA production lines,
As a management system of information about assembled parts, the above-mentioned wireless communication type moving object identification system has been widely used. This wireless communication type moving object identification system is equipped with an interrogator on the ground side of the production line and a responder on the moving object on the line to read and write production control data between the interrogator and the responder. Thus, a wireless communication device that transmits data by using electromagnetic induction, electromagnetic coupling, or the like as a communication medium is widely used for the interrogator and the responder.
【０００３】次に、従来より実施されている移動物体識
別システムを図３に示す。図において、１はマイクロコ
ンピュータからなる通信回路１１，アンテナコイル１２
を備えた質問器、２は質問器１の通信回路１１のマイク
ロコンピュータにインターフェースを介して接続した上
位計算機、３は通信回路３１，アンテナコイル３２，同
調コンデンサ３３，マイクロプロセッサ３４，メモリ３
５，電源電池３６などを備えて構成した応答器である。Next, a conventional moving object identification system is shown in FIG. In the figure, reference numeral 1 is a communication circuit 11 composed of a microcomputer, and an antenna coil 12.
An interrogator provided with 2 is a host computer connected to the microcomputer of the communication circuit 11 of the interrogator 1 through an interface, and 3 is a communication circuit 31, an antenna coil 32, a tuning capacitor 33, a microprocessor 34, a memory 3
5, a transponder including a power supply battery 36 and the like.
【０００４】かかる構成で、応答器３のメモリ３５にデ
ータを書き込む場合には、質問器１と応答器３とが接近
して向かい合った状態で、上位計算機２の支援の下に質
問器１から応答器３に呼掛けを行って書き込みデータを
送信する。これにより、応答器３は書き込みデータを受
信してメモリ３５に格納する。また、応答器３のメモリ
３５に格納されているデータを質問器１で読み取る場合
には、前記とは逆にメモリ３５から読み出したデータを
応答器３から質問器１に向けて送信し、応答器３はこれ
を受信して上位計算機２に伝える。なお、応答器３にお
けるアンテナコイル３１と同調コンデンサ３３とで構成
した共振回路は、質問器１との間で設定した所定の通信
周波数と同調するようにアンテナコイルのインダクタン
スＬ，同調コンデンサのキャパシタンスＣの各定数があ
らかじめ調整されている。With such a configuration, when writing data to the memory 35 of the responder 3, the interrogator 1 and the responder 3 approach each other and face each other with the assistance of the host computer 2 from the interrogator 1. The responder 3 is interrogated and the write data is transmitted. As a result, the responder 3 receives the write data and stores it in the memory 35. When the data stored in the memory 35 of the transponder 3 is read by the interrogator 1, the data read from the memory 35 is transmitted from the transponder 3 to the interrogator 1 contrary to the above, and the response is sent. The device 3 receives this and sends it to the host computer 2. In addition, the resonance circuit formed by the antenna coil 31 and the tuning capacitor 33 in the transponder 3 is arranged such that the inductance L of the antenna coil and the capacitance C of the tuning capacitor are tuned so as to tune with a predetermined communication frequency set with the interrogator 1. Each constant of is adjusted in advance.
【０００５】[0005]
【発明が解決しようとする課題】ところで、前記のよう
移動物体識別システムで、応答器３を取付けた移動物体
自身が金属であったりして応答器のすぐ近くに金属物体
が存在すると、応答器３のアンテナがこの金属物体の影
響を受けて質問器１との間の交信機能が低下するといっ
た問題点がある。すなわち、応答器３のアンテナコイル
３２の背後側に金属物体が近づいて、アンテナコイルか
ら発生した磁束が金属物体に入射すると、金属物体の表
面にうず電流が発生し、アンテナコイルのもつ磁気エネ
ルギーが失われる。ここで、アンテナコイルのインダク
タンスＬはＬ＝２Ｅ／Ｉ2 （但し、Ｅは磁気エネルギ
ー，Ｉはアンテナコイルの通電電流）で表されることか
ら、磁気エネルギーＥの減少によりアンテナコイルのイ
ンダクタンスＬが減少する。一方、アンテナコイル３２
と同調コンデンサ３３とで構成した共振回路の共振周波
数ｆO は、 ｆO ＝１／２π（ＬＣ）1/2 として表される。したがって、アンテナコイル３２のイ
ンダクタンスＬが減少すると共振周波数が低い方にず
れ、アンテナの同調周波数があらかじめ設定した値から
変化する。この結果、質問器１と応答器３との間の交信
感度が弱まって交信距離が低下するなどの不具合が発生
する。By the way, in the moving object identification system as described above, if the moving object to which the transponder 3 is attached is a metal itself and there is a metallic object in the immediate vicinity of the transponder, the transponder will respond. There is a problem that the communication function between the antenna 3 and the interrogator 1 is deteriorated due to the influence of the metal object. That is, when a metal object approaches the back side of the antenna coil 32 of the transponder 3 and the magnetic flux generated from the antenna coil enters the metal object, an eddy current is generated on the surface of the metal object, and the magnetic energy of the antenna coil is reduced. Lost. Here, since the inductance L of the antenna coil is represented by L = 2E / I 2 (where E is the magnetic energy, I is the current flowing through the antenna coil), the inductance L of the antenna coil decreases due to the decrease in the magnetic energy E. Decrease. On the other hand, the antenna coil 32
The resonance frequency f O of the resonance circuit configured by the tuning capacitor 33 and the tuning capacitor 33 is expressed as f O = 1 / 2π (LC) 1/2 . Therefore, when the inductance L of the antenna coil 32 decreases, the resonance frequency shifts to the lower side, and the tuning frequency of the antenna changes from the preset value. As a result, the communication sensitivity between the interrogator 1 and the responder 3 is weakened, and the communication distance is reduced, which causes a problem.
【０００６】このための対策として、従来では次のよう
な方策が提案されている。 （１）質問器１，応答器３に内蔵した各アンテナコイル
１２，３２を３脚形フェライトコアの中央脚に巻装し、
アンテナコイル同士が接近して向かいあった状態での漏
洩磁束を抑えて磁束がアンテナコイルに近づいた金属物
体と鎖交するのを防ぐようにする。 （２）応答器３に装備のアンテナコイル３２の背面を金
属シールド板で囲い、この状態でアンテナの共振周波数
が交信周波数に合致するように同調コイル３３のキャパ
シタンスを調整しておき、応答器２の背後に金属物体が
接近した場合の影響を低減させる。As measures against this, conventionally, the following measures have been proposed. (1) The antenna coils 12 and 32 built in the interrogator 1 and the responder 3 are wound around the center leg of a tripod type ferrite core,
Leakage magnetic flux is suppressed when the antenna coils are close to and face each other to prevent the magnetic flux from interlinking with a metal object approaching the antenna coil. (2) The back surface of the antenna coil 32 mounted on the transponder 3 is surrounded by a metal shield plate, and in this state, the capacitance of the tuning coil 33 is adjusted so that the resonance frequency of the antenna matches the communication frequency. Reduces the effect of a metal object approaching behind.
【０００７】しかしながら、前記した従来の対策は金属
の影響を低減できる反面、高価なフェライトコア，金属
シールド板を追加装備するためにコスト高，製作工程の
増加，装置の大形化などの問題が残る。本発明は上記の
点にかんがみなされたものであり、その目的は先記した
応答器を対象に、高価なフェライトコア，金属シールド
板を追加装備することなく、応答器の構成部品を巧みに
レイアウトすることで金属物体の接近による通信機能へ
の悪影響を低減できるようにしたデータ伝送用無線通信
機を提供することにある。However, while the above-mentioned conventional measures can reduce the influence of metal, there are problems such as high cost, increase in manufacturing process, and enlargement of the device because an expensive ferrite core and a metal shield plate are additionally equipped. Remain. The present invention has been made in view of the above points, and its purpose is to skillfully lay out the components of the transponder for the transponder described above without additionally providing an expensive ferrite core or metal shield plate. By doing so, it is an object of the present invention to provide a wireless communication device for data transmission capable of reducing the adverse effect on the communication function due to the approach of a metal object.
【０００８】[0008]
【課題を解決するための手段】上記目的は、本発明によ
り、アンテナコイルの背後に電池を並置配備し、かつこ
の組立状態で同調コンデンサ，アンテナコイルの定数を
所定の通信周波数で共振するように設定することにより
達成される。ここで、上記の構成においては、アンテナ
コイルに対する電池の投影面積をアンテナコイルの開口
面積の８０％以上とし、かつアンテナコイルと電池との
間の間隔をアンテナコイルの開口面積の平方根の値以下
することが好ましい。また、前記構成の実施態様とし
て、電池をアンテナコイルの背後に並置したプリント配
線板に取付けて構成することができる。SUMMARY OF THE INVENTION According to the present invention, a battery is provided in parallel behind an antenna coil, and in this assembled state, the tuning capacitor and the constant of the antenna coil resonate at a predetermined communication frequency. It is achieved by setting. Here, in the above configuration, the projected area of the battery with respect to the antenna coil is 80% or more of the opening area of the antenna coil, and the distance between the antenna coil and the battery is not more than the square root value of the opening area of the antenna coil. Preferably. Further, as an embodiment of the above configuration, the battery can be attached to a printed wiring board juxtaposed behind the antenna coil.
【０００９】[0009]
【作用】上記の構成により、アンテナコイルと一緒にケ
ース内に組み込まれている電池の金属製外装がアンテナ
コイルに対する磁気シールドとして機能するので、アン
テナコイルに流れる電流によって生じた磁束が電池より
背後に漏洩しない。したがって金属物体が接近してもア
ンテナコイルのインダクタンスは殆ど変化しない。しか
もアンテナコイルと同調コンデンサの定数は、あらかじ
め電池を所定位置に組み込んだ状態でアンテナの共振周
波数が通信機の通信周波数と一致するように設定されて
いるので、金属物体の接近による影響を受けることなく
安定した通信性能が維持される。With the above structure, the metal outer casing of the battery, which is built into the case together with the antenna coil, functions as a magnetic shield for the antenna coil, so that the magnetic flux generated by the current flowing through the antenna coil is located behind the battery. Do not leak. Therefore, the inductance of the antenna coil hardly changes even when the metal object approaches. Moreover, the constants of the antenna coil and tuning capacitor are set so that the resonance frequency of the antenna matches the communication frequency of the communication device when the battery is installed in the specified position beforehand, so it is affected by the approach of metal objects. Stable communication performance is maintained.
【００１０】[0010]
【実施例】以下本発明の実施例を図面に基づいて説明す
る。図１は図３で述べた応答器３の組立構造を示すもの
であり、図において、３７は非金属で作られた応答器３
のケースであり、その内部にはアンテナコイル３２と通
信回路を構成したプリント配線板３８とが前後に並べて
組み込まれている。そして、プリント配線板３８の前部
には同調コンデンサ３３が、また後部には電源用の電池
（外装が金属であるボタン電池）３６がその外装電極面
をアンテナコイル３２に向けて取付けられている。な
お、３９はケース３８内に組み込まれた前記各部品を封
止したモールド樹脂である。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an assembled structure of the transponder 3 described in FIG. 3. In the figure, 37 is a transponder 3 made of a nonmetal.
In this case, the antenna coil 32 and the printed wiring board 38 forming the communication circuit are installed side by side in the front and rear. A tuning capacitor 33 is attached to the front part of the printed wiring board 38, and a battery for power supply (button battery whose exterior is metal) 36 is attached to the rear part of the printed wiring board 38 with its exterior electrode surface facing the antenna coil 32. .. In addition, 39 is a mold resin that seals the above-mentioned respective parts incorporated in the case 38.
【００１１】ここで、アンテナコイル３２と電池３６と
は次のような関係を確保するようにしてケースに組み込
まれている。すなわち、外形が方形をなすループアンテ
ナとして構成されたアンテナコイル３２の開口面積をＳ
（Ｓ＝縦辺長Ａ×横辺長Ｂ）として、該アンテナコイル
に対して電池３６がアンテナコイル３２を背後から覆う
面積割合，つまり電池の投影面積が前記開口面積Ｓの少
なくとも８０％以上であり、かつアンテナコイル３２と
電池３６との間の間隔距離ＤがＳ1/2 に相応した寸法以
下となるように配置されている。そして、この組立状態
でアンテナコイル３２と同調コンデンサ３３とで構成さ
れる共振回路の共振周波数が所定の通信周波数（質問器
１の送信周波数）と同調するように、例えば同調コンデ
ンサ３３を調整しておく。なお、前記したアンテナコイ
ル３２と電池３６との間の配置条件は、発明者等が実験
により得た実用的な適正範囲であり、実際の実施に当た
ってはこのような条件で応答器３を組立構成するのが好
ましい。Here, the antenna coil 32 and the battery 36 are assembled in the case so as to ensure the following relationship. That is, the opening area of the antenna coil 32 configured as a loop antenna having a rectangular outer shape is S
As (S = vertical side length A × horizontal side length B), the area ratio of the battery 36 covering the antenna coil 32 from the rear with respect to the antenna coil, that is, the projected area of the battery is at least 80% or more of the opening area S. It is arranged such that the distance D between the antenna coil 32 and the battery 36 is equal to or smaller than S 1/2 . Then, for example, the tuning capacitor 33 is adjusted so that the resonance frequency of the resonance circuit configured by the antenna coil 32 and the tuning capacitor 33 is tuned to a predetermined communication frequency (transmission frequency of the interrogator 1) in this assembled state. deep. The above-mentioned arrangement condition between the antenna coil 32 and the battery 36 is a practically appropriate range obtained by experiments by the inventors, and in actual implementation, the transponder 3 is assembled and configured under such a condition. Preferably.
【００１２】これにより、質問器１と応答器３との間の
交信状態では、図２に示すように磁束φは電池３６の金
属外装が電磁シールドとして機能するために、その背後
には殆ど磁束が漏れない。したがって、この状態で応答
器３の背後に金属物体が近づいても影響を殆どうけるこ
とがなく、アンテナコイル３２のインダクタンスＬも変
化がなく、これにより金属物体の接近有無に関係なく常
にアンテナ系が通信周波数との同調を保って安定した通
信性能が維持されることになる。しかも、アンテナコイ
ル３２に対する電磁シールドとして応答器３に標準装備
されている電源用電池３６を利用したので、別部品とし
てのシールド板を追加装備する必要がない。As a result, in the communication state between the interrogator 1 and the responder 3, as shown in FIG. 2, the magnetic flux φ has almost no magnetic flux behind it because the metal casing of the battery 36 functions as an electromagnetic shield. Does not leak. Therefore, even if a metallic object approaches the back of the transponder 3 in this state, it is hardly affected, and the inductance L of the antenna coil 32 does not change, so that the antenna system is always maintained regardless of the proximity of the metallic object. Stable communication performance is maintained by keeping the tuning with the communication frequency. Moreover, since the power supply battery 36, which is provided as standard equipment in the transponder 3, is used as an electromagnetic shield for the antenna coil 32, it is not necessary to additionally equip a shield plate as a separate component.
【００１３】[0013]
【発明の効果】以上述べたように本発明の構成によれ
ば、特にアンテナコイルに対して高価なフェライトコ
ア，電磁シールド板などの部品を追加装備することな
く、電源用電池の金属外装を電磁シールドとして巧みに
利用し、かつこの組立構成に合わせてアンテナ系の定数
を調整することにより、安価，軽量な構成で金属影響の
少ないデータ伝送用無線通信機を提供することができ
る。As described above, according to the configuration of the present invention, the metal exterior of the power supply battery is electromagnetically coupled without additionally installing expensive components such as a ferrite core and an electromagnetic shield plate to the antenna coil. By skillfully utilizing it as a shield and adjusting the constants of the antenna system according to this assembly configuration, it is possible to provide a wireless communication device for data transmission with a low-cost and lightweight configuration and less metal influence.
【図１】移動物体識別装置の応答器を実施対象とした本
発明実施例の構成断面図であり、（ａ）は側面図、
（ｂ）は正面図FIG. 1 is a configuration cross-sectional view of an embodiment of the present invention in which a transponder of a moving object identification device is implemented, (a) is a side view,
(B) is a front view
【図２】図１の動作説明図FIG. 2 is an operation explanatory diagram of FIG.
【図３】本発明の実施対象となる移動物体識別システム
のブロック図FIG. 3 is a block diagram of a moving object identification system to which the present invention is applied.
１ 質問器 ３ 応答器 ３１ 通信回路 ３２ アンテナコイル ３３ 同調コンデンサ ３６ 電池 ３７ ケース ３８ プリント配線板 1 Interrogator 3 Responder 31 Communication circuit 32 Antenna coil 33 Tuning capacitor 36 Battery 37 Case 38 Printed wiring board
Claims (3)
タの交信を行う無線通信機であり、通信機のケース内に
少なくともアンテナコイル, 該アンテナコイルに並列接
続した同調コンデンサ，通信回路のプリント配線板, お
よび電源用電池を内蔵したものにおいて、アンテナコイ
ルの背後に電池を並置配備し、かつこの組立状態で同調
コンデンサ，アンテナコイルの定数を所定の通信周波数
で共振するように設定したことを特徴とするデータ伝送
用無線通信機。1. A wireless communication device for communicating data using electromagnetic induction and electromagnetic coupling as a communication medium, comprising at least an antenna coil in a case of the communication device, a tuning capacitor connected in parallel to the antenna coil, and a printed wiring of a communication circuit. In the case of a plate and a battery for power supply built-in, the batteries are placed side by side behind the antenna coil, and the constants of the tuning capacitor and antenna coil are set to resonate at a specified communication frequency in this assembled state. A wireless communication device for data transmission.
テナコイルに対する電池の投影面積がアンテナコイルの
開口面積の８０％以上であり、かつアンテナコイルと電
池との間の間隔がアンテナ用コイルの開口面積の平方根
の値以下であることを特徴とするデータ伝送用無線通信
機2. The wireless communication device according to claim 1, wherein the projected area of the battery with respect to the antenna coil is 80% or more of the opening area of the antenna coil, and the distance between the antenna coil and the battery is equal to that of the antenna coil. Wireless communication device for data transmission, characterized by being less than the square root value of the opening area
をアンテナコイルの背後に並置したプリント配線板に取
付けたことを特徴とするデータ伝送用無線通信機。3. The wireless communication device for data transmission according to claim 1, wherein a battery is attached to a printed wiring board juxtaposed behind the antenna coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3240044A JPH0583173A (en) | 1991-09-20 | 1991-09-20 | Wireless communication device for data transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3240044A JPH0583173A (en) | 1991-09-20 | 1991-09-20 | Wireless communication device for data transmission |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0583173A true JPH0583173A (en) | 1993-04-02 |
Family
ID=17053643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3240044A Pending JPH0583173A (en) | 1991-09-20 | 1991-09-20 | Wireless communication device for data transmission |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0583173A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08263610A (en) * | 1995-03-22 | 1996-10-11 | Otec Denshi Kk | Non-contact card reader |
| US6608550B2 (en) | 1997-06-20 | 2003-08-19 | Hitachi, Ltd. | Reader and/or writer apparatus, power feeding system, and communication system |
| JP2007306147A (en) * | 2006-05-09 | 2007-11-22 | Ricoh Co Ltd | Imaging apparatus |
| US8269595B2 (en) | 2007-07-11 | 2012-09-18 | Seiko Epson Corporation | Coil unit and electronic instrument |
| WO2013089195A1 (en) * | 2011-12-14 | 2013-06-20 | Ｎｅｃカシオモバイルコミュニケーションズ株式会社 | Mobile terminal apparatus and method for adjusting rfid antenna resonance frequency thereof |
| EP3122071A1 (en) * | 2015-07-21 | 2017-01-25 | GN ReSound A/S | An in-the-ear hearing aid having combined antennas |
| US9609443B2 (en) | 2015-07-21 | 2017-03-28 | Gn Hearing A/S | In-the-ear hearing aid having combined antennas |
| US10531557B2 (en) | 2016-07-28 | 2020-01-07 | Murata Manufacturing Co., Ltd. | Wireless module, RFID system, and wireless power supply device |
-
1991
- 1991-09-20 JP JP3240044A patent/JPH0583173A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08263610A (en) * | 1995-03-22 | 1996-10-11 | Otec Denshi Kk | Non-contact card reader |
| US6608550B2 (en) | 1997-06-20 | 2003-08-19 | Hitachi, Ltd. | Reader and/or writer apparatus, power feeding system, and communication system |
| JP2007306147A (en) * | 2006-05-09 | 2007-11-22 | Ricoh Co Ltd | Imaging apparatus |
| US8269595B2 (en) | 2007-07-11 | 2012-09-18 | Seiko Epson Corporation | Coil unit and electronic instrument |
| WO2013089195A1 (en) * | 2011-12-14 | 2013-06-20 | Ｎｅｃカシオモバイルコミュニケーションズ株式会社 | Mobile terminal apparatus and method for adjusting rfid antenna resonance frequency thereof |
| EP3122071A1 (en) * | 2015-07-21 | 2017-01-25 | GN ReSound A/S | An in-the-ear hearing aid having combined antennas |
| US9609443B2 (en) | 2015-07-21 | 2017-03-28 | Gn Hearing A/S | In-the-ear hearing aid having combined antennas |
| EP3442246A1 (en) * | 2015-07-21 | 2019-02-13 | GN Hearing A/S | An in-the-ear hearing aid having combined antennas |
| US10531557B2 (en) | 2016-07-28 | 2020-01-07 | Murata Manufacturing Co., Ltd. | Wireless module, RFID system, and wireless power supply device |
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