JPH0779182A - Contactless communications system - Google Patents
Contactless communications systemInfo
- Publication number
- JPH0779182A JPH0779182A JP5173599A JP17359993A JPH0779182A JP H0779182 A JPH0779182 A JP H0779182A JP 5173599 A JP5173599 A JP 5173599A JP 17359993 A JP17359993 A JP 17359993A JP H0779182 A JPH0779182 A JP H0779182A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- magnetic flux
- transmission
- card
- receiving coil
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 44
- 230000004907 flux Effects 0.000 claims abstract description 33
- 230000005672 electromagnetic field Effects 0.000 claims abstract description 15
- 239000000284 extract Substances 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 7
- 238000013459 approach Methods 0.000 description 2
- 238000011549 displacement method Methods 0.000 description 1
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、親側の送信コイルが
作る電磁界中に子側を近づけることによって子側の送受
信コイルに電圧を誘起させ、この誘起される電圧により
子側で動作電源を作り、所定周波数の搬送信号にデータ
を乗せて子側の送受信コイルより親側へ送信し、この送
信信号を親側にて受信する非接触通信システムに関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention induces a voltage in a transmitter / receiver coil on the child side by bringing the child side closer to an electromagnetic field created by the transmitter coil on the parent side, and the induced voltage causes an operating power supply on the child side. The present invention relates to a non-contact communication system in which data is added to a carrier signal of a predetermined frequency, data is transmitted to a parent side from a child side transmission / reception coil, and the parent side receives the transmission signal.
【０００２】[0002]
【従来の技術】従来より、この種の非接触通信システム
として、リーダ（親側）とＩＣカード（子側）とを用
い、リーダにＩＣカードを近づけることにより、ＩＣカ
ードに書き込まれた識別コードを読み取り、その識別コ
ードを照合してドアを解錠する識別システムが知られて
いる。この識別システムでは、リーダの送受信コイルの
作る電磁界中にＩＣカードが近づくと、ＩＣカードの送
受信コイルに電圧が誘起され、この誘起される電圧によ
りＩＣカードの動作電源が作られる。ＩＣカードは、こ
の動作電源を得て、自己に割り当てられた識別コード
（子側識別コード）を所定周波数（例えば、５００ｋH
z）の搬送信号に乗せて返送する。リーダは、ＩＣカー
ドからの送信信号をその送受信コイルで受信し、その送
信信号からデータ信号を分離して取り出し、そのデータ
信号から子側識別コードを読み取り、自己に割り当てら
れた識別コード（親側識別コード）と照合し、一致した
ときドアを解錠する。2. Description of the Related Art Conventionally, as a non-contact communication system of this kind, a reader (parent side) and an IC card (child side) have been used, and an identification code written in the IC card by bringing the IC card close to the reader. An identification system is known in which a door is read and the identification code is compared to unlock the door. In this identification system, when the IC card approaches the electromagnetic field created by the transmission / reception coil of the reader, a voltage is induced in the transmission / reception coil of the IC card, and the operating voltage of the IC card is generated by the induced voltage. The IC card obtains this operating power source and outputs the identification code (child-side identification code) assigned to itself to a predetermined frequency (for example, 500 kHz).
z) Return the carrier signal. The reader receives the transmission signal from the IC card with its transmission / reception coil, separates the data signal from the transmission signal, extracts the data signal, reads the child-side identification code from the data signal, and identifies the identification code (parent side) assigned to itself. ID code) and unlock the door when they match.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、このよ
うな従来の非接触通信システムでは、リーダにおいて、
その送受信コイルは常に電磁界を作っており、すなわち
送受信コイルには常に電流が流れており、このため、Ｉ
Ｃカードからの送信信号を受信する際のＳＮ比が悪く、
データ信号の取り出しが困難であるという問題が生じて
いた。However, in such a conventional contactless communication system, in the reader,
The transmission / reception coil always creates an electromagnetic field, that is, current always flows in the transmission / reception coil.
The SN ratio when receiving the transmission signal from the C card is poor,
There has been a problem that it is difficult to extract the data signal.
【０００４】本発明はこのような課題を解決するために
なされたもので、その目的とするところは、ＩＣカード
からの送信信号を受信する際のＳＮ比を改善し、データ
信号の取り出しを容易とすることが可能な非接触通信シ
ステムを提供することにある。The present invention has been made in order to solve such a problem, and its object is to improve the SN ratio when receiving a transmission signal from an IC card and to easily take out a data signal. It is to provide a contactless communication system capable of
【０００５】[0005]
【課題を解決するための手段】このような目的を達成す
るために、本発明は、上述の非接触通信システムにおい
て、親側の送受信コイルを送信コイルと受信コイルとに
分け、送信コイルの作る電磁界中に、一方側から他方側
へ向かう磁束と他方側から一方側へ向かう磁束とが同時
に鎖交するように、受信コイルを配置するようにしたも
のである。In order to achieve such an object, according to the present invention, in the above-mentioned non-contact communication system, a parent side transmitting / receiving coil is divided into a transmitting coil and a receiving coil, and a transmitting coil is formed. In the electromagnetic field, the receiving coil is arranged so that the magnetic flux from one side to the other side and the magnetic flux from the other side to the one side are simultaneously linked.
【０００６】[0006]
【作用】したがってこの発明によれば、一方側から他方
側へ向かう磁束と他方側から一方側へ向かう磁束との鎖
交数の差が最小となるよにうな位置に受信コイルを配置
すれば、互いに逆方向の磁束で打ち消され、送信コイル
の作る電磁界によって受信コイルに誘導される電流が最
小となる。Therefore, according to the present invention, if the receiving coil is arranged at such a position that the difference in the number of linkages between the magnetic flux traveling from one side to the other side and the magnetic flux traveling from the other side to the one side is minimized, The magnetic fluxes in opposite directions cancel each other out, and the current induced in the receiving coil by the electromagnetic field created by the transmitting coil is minimized.
【０００７】[0007]
【実施例】以下、本発明を実施例に基づき詳細に説明す
る。EXAMPLES The present invention will now be described in detail based on examples.
【０００８】図２はこの発明の一実施例を示す識別シス
テムの構成図である。同図において、１はドア側に配置
されたリーダ、２はリーダ１に近づけられるＩＣカード
である。FIG. 2 is a block diagram of an identification system showing an embodiment of the present invention. In the figure, 1 is a reader arranged on the door side, and 2 is an IC card that can be brought close to the reader 1.
【０００９】リーダ１は、ＣＰＵ１−１、通信制御装置
１−２、ＡＳＫ変調器１−３、ドライバ１−４、送信コ
イル１−５、受信コイル１−６、バンドパスフィルタ１
−７およびＦＳＫ復調器１−８を備えている。このリー
ダ１において、ＣＰＵ１−１は、通信制御装置１−２，
ＡＳＫ変調器１−３，ドライバ１−４を介し送信コイル
１−５を駆動し、所定の電磁界を発生させる。The reader 1 includes a CPU 1-1, a communication control device 1-2, an ASK modulator 1-3, a driver 1-4, a transmitting coil 1-5, a receiving coil 1-6 and a bandpass filter 1.
-7 and FSK demodulator 1-8. In this reader 1, the CPU 1-1 has the communication control device 1-2 and
The transmission coil 1-5 is driven through the ASK modulator 1-3 and the driver 1-4 to generate a predetermined electromagnetic field.
【００１０】また、リーダ１において、送信コイル１−
５と受信コイル１−６とは、図１（ａ）および（ｂ）に
その斜視図および平面図を示すように、互いにその一部
が交差するように上下方向に配置されている。すなわ
ち、送信コイル１−５の作る電磁界中に、一方側から他
方側へ向かう磁束Φａと他方側から一方側へ向かう磁束
Φｂとが同時に鎖交するように、また磁束Φａ（領域Ａ
中の鎖交磁束）と磁束Φｂ（領域Ｂ中の鎖交磁束）との
磁束数の差が最小となるような位置に、受信コイル１−
６が配置されている。Further, in the reader 1, the transmission coil 1-
As shown in the perspective view and the plan view of FIGS. 1 (a) and 1 (b), the receiving coil 5 and the receiving coil 1-6 are arranged in the up-down direction so as to partially intersect each other. That is, in the electromagnetic field created by the transmitter coils 1-5, the magnetic flux Φa directed from one side to the other side and the magnetic flux Φb directed from the other side to the one side are simultaneously linked, and the magnetic flux Φa (region A
(The interlinkage magnetic flux in the inside) and the magnetic flux Φb (the interlinkage magnetic flux in the region B) at a position where the difference in the number of magnetic fluxes between them is minimized.
6 are arranged.
【００１１】なお、本実施例において、受信コイル１−
６の位置は、受信コイル１−６に流れる誘導電流をオシ
ロスコープで観察しながら、見つけ出している。In this embodiment, the receiving coil 1-
The position of 6 is found while observing the induced current flowing in the receiving coil 1-6 with an oscilloscope.
【００１２】一方、ＩＣカード２は、送受信コイル２−
１，整流器２−２，シャントレギュレータ２−３，ロー
パスフィルタ２−４，コントロールロジック２−５，Ｅ
ＥＰＲＯＭ２−６，ＦＳＫ変調器２−７およびドライバ
２−８を備えている。このＩＣカード２において、ＥＥ
ＰＲＯＭ２−６には、ＩＣカード２に割り当てられた識
別コード（子側識別コード）が書き込まれている。On the other hand, the IC card 2 has a transmission / reception coil 2-
1, rectifier 2-2, shunt regulator 2-3, low-pass filter 2-4, control logic 2-5, E
It has an EPROM 2-6, an FSK modulator 2-7 and a driver 2-8. In this IC card 2, EE
An identification code (child-side identification code) assigned to the IC card 2 is written in the PROM 2-6.
【００１３】次に、このように構成された識別システム
について、その特徴的な動作を各部の機能を交えながら
説明する。Next, a description will be given of the characteristic operation of the identification system having the above-mentioned configuration, including the functions of the respective parts.
【００１４】ＩＣカード２がリーダ１に近づき、リーダ
１の送信コイル１−５の作る電磁界中に入ると、ＩＣカ
ード２の送受信コイル２−１に電圧が誘起される。この
誘起される電圧により電流が発生し、これが整流器２−
２で整流され、シャントレギュレータ２−３へ与えられ
て動作電源が作られ、コントロールロジック２−５へ与
えられる。When the IC card 2 approaches the reader 1 and enters the electromagnetic field created by the transmission coil 1-5 of the reader 1, a voltage is induced in the transmission / reception coil 2-1 of the IC card 2. A current is generated by the induced voltage, which is a rectifier 2-
It is rectified by 2 and applied to the shunt regulator 2-3 to generate operating power, which is applied to the control logic 2-5.
【００１５】コントロールロジック２−５は、レギュレ
ータ２−３からの電源を受けると、ＥＥＰＲＯＭ２−６
に書き込まれた子側識別コードを読み取り、これをＦＳ
Ｋ変調器２−７で周波数変位方式にて変調し、所定周波
数（例えば、５００ｋHz）の搬送信号に乗せて、ドライ
バ２−８を介し送受信コイル２−１よりリーダ１へ返送
する。The control logic 2-5 receives the power from the regulator 2-3, and the EEPROM 2-6.
Read the child identification code written in the
The signal is modulated by the K modulator 2-7 by the frequency displacement method, is carried on a carrier signal of a predetermined frequency (for example, 500 kHz), and is returned from the transmission / reception coil 2-1 to the reader 1 via the driver 2-8.
【００１６】リーダ１は、このＩＣカード２からの送信
信号を受信コイル１−６にて受信し、バンドパスフィル
タ１−７，ＦＳＫ復調器１−８，通信制御装置１−２を
経てＣＰＵ１−１に取り込み、この取り込んだ送信信号
（子側識別コード）と自己に割り当てられた親側識別コ
ードとを照合し、一致すればドアを解錠する。The reader 1 receives the transmission signal from the IC card 2 at the receiving coil 1-6, passes through the band pass filter 1-7, the FSK demodulator 1-8, the communication control device 1-2, and the CPU 1-. 1, the received transmission signal (child-side identification code) is compared with the parent-side identification code assigned to itself, and if they match, the door is unlocked.
【００１７】ここで、リーダ１において、ＩＣカード２
からの送信信号の受信コイル１−６での受信に着目して
みる。この場合、受信コイル１−６には送信コイル１−
５の作る電磁界中の磁束が鎖交するが、領域Ａ中の鎖交
磁束Φａと領域Ｂ中の鎖交磁束Φｂとの磁束数の差は最
小（ほゞ零）であるので、互いに逆方向の磁束で打ち消
され、送信コイル１−５の作る電磁界によって受信コイ
ル１−６に誘導される電流は最小（ほゞ零）となる。こ
れにより、ＩＣカード２からの送信信号を受信する際の
ＳＮ比が改善され、データ信号の取り出しが容易とな
る。Here, in the reader 1, the IC card 2
Attention is paid to the reception of the transmission signal from the receiving coil 1-6. In this case, the receiving coil 1-6 has a transmitting coil 1-
Although the magnetic fluxes in the electromagnetic field created by 5 interlink, the difference in the number of magnetic fluxes between the interlinking magnetic flux Φa in the area A and the interlinking magnetic flux Φb in the area B is the minimum (almost zero), so they are opposite to each other. The current that is canceled by the magnetic flux in the direction and is induced in the receiving coil 1-6 by the electromagnetic field created by the transmitting coil 1-5 becomes the minimum (about zero). As a result, the SN ratio at the time of receiving the transmission signal from the IC card 2 is improved, and the data signal can be taken out easily.
【００１８】なお、本実施例では、送信コイル１−５と
受信コイル１−６とを一つずつ設け、これらを上下方向
に交差させて配置するものとしたが、図３（ａ）および
（ｂ）にその斜視図および平面図を示すように、送信コ
イルと受信コイルとを２個ずつ設ける構成としてもよ
い。すなわち、送信コイル１−５１，１−５２を隣接し
て配置し、この送信コイル１−５１，１−５２の上側に
交差して受信コイル１−６１を配置し、下側に交差して
受信コイル１−６２を配置するものとしてもよい。この
ような構成とすることにより、リーダ１での送受信の中
心を一致させることが可能となる。In this embodiment, the transmitting coil 1-5 and the receiving coil 1-6 are provided one by one, and they are arranged so as to cross each other in the vertical direction. As shown in the perspective view and the plan view in b), two transmitting coils and two receiving coils may be provided. That is, the transmission coils 1-51 and 1-52 are arranged adjacent to each other, the reception coil 1-61 is arranged above the transmission coils 1-51 and 1-52, and the reception coil 1-61 is arranged below the transmission coils 1-51 and 1-52. The coils 1-62 may be arranged. With such a configuration, it becomes possible to match the transmission and reception centers of the reader 1.
【００１９】すなわち、図１に示した構成では、リーダ
１の送信中心が送信コイル１−５の中心Ｐ１となり、受
信中心が受信コイル１−６の中心Ｐ２となる。このた
め、図４に示すように、ＩＣカード２での最良受信ポイ
ントと最良送信ポイントとがずれる。これに対して、図
３に示した構成では、リーダ１での送信中心（送信コイ
ル１−５１の中心Ｐ１１と送信コイル１−５２の中心Ｐ
１２とを結ぶ直線の中心）と受信中心（受信コイル１−
６１の中心Ｐ２１と受信コイル１−６２の中心Ｐ２２と
を結ぶ直線の中心）とが点Ｐで一致し、図５に示すよう
に、ＩＣカード２での最良受信ポイントと最良送信ポイ
ントとが一致する。That is, in the configuration shown in FIG. 1, the transmission center of the reader 1 is the center P1 of the transmission coil 1-5, and the reception center is the center P2 of the reception coil 1-6. Therefore, as shown in FIG. 4, the best reception point and the best transmission point of the IC card 2 are deviated. On the other hand, in the configuration shown in FIG. 3, the transmission center of the reader 1 (the center P11 of the transmission coil 1-51 and the center P of the transmission coil 1-52 is shown).
12 and the center of reception (reception coil 1-)
The center P21 of 61 and the center of the straight line connecting the center P22 of the receiving coil 1-62) match at point P, and as shown in FIG. 5, the best receiving point and the best sending point of the IC card 2 match. To do.
【００２０】なお、図３においては、受信コイル１−６
２を送信コイル１−５１，１−５２の下側に配置した
が、図６に示すように、送信コイル１−５１，１−５２
の上側に受信コイル１−６１と並べて受信コイル１−６
２を配置するものとしてもよい。In FIG. 3, the receiving coil 1-6
2 is arranged below the transmission coils 1-51 and 1-52, but as shown in FIG.
Side by side with the receiving coil 1-61 on the upper side of the receiving coil 1-6
Two may be arranged.
【００２１】[0021]
【発明の効果】以上説明したことから明らかなように本
発明によれば、送信コイルの作る電磁界中に、一方側か
ら他方側へ向かう磁束と他方側から一方側へ向かう磁束
とが同時に鎖交するように受信コイルを配置するように
したので、一方側から他方側へ向かう磁束と他方側から
一方側へ向かう磁束との鎖交数の差が最小となるよにう
な位置に受信コイルを配置すれば、互いに逆方向の磁束
で打ち消され、送信コイルの作る電磁界によって受信コ
イルに誘導される電流が最小となり、子側からの送信信
号を受信する際のＳＮ比が改善され、データ信号の取り
出しを容易にすることが可能となる。As is apparent from the above description, according to the present invention, in the electromagnetic field created by the transmitter coil, the magnetic flux from one side to the other side and the magnetic flux from the other side to the one side are simultaneously chained. Since the receiving coils are arranged so as to intersect with each other, the receiving coil is placed at such a position that the difference in the number of links between the magnetic flux from one side to the other side and the magnetic flux from the other side to the one side is minimized. If placed, the magnetic fluxes in opposite directions cancel each other out, the current induced in the receiving coil by the electromagnetic field created by the transmitting coil is minimized, and the SN ratio when receiving the transmission signal from the child side is improved. It becomes possible to easily take out.
【図１】図２に示した識別システムにおけるリーダ側で
の送信コイルと受信コイルとの構成およびその配置状況
を示す図である。FIG. 1 is a diagram showing a configuration of a transmission coil and a reception coil on a reader side in the identification system shown in FIG. 2 and an arrangement state thereof.
【図２】本発明の一実施例を示す識別システムの構成図
である。FIG. 2 is a configuration diagram of an identification system showing an embodiment of the present invention.
【図３】リーダ側での送信コイルと受信コイルとの構成
およびその配置状況の他の実施例を示す図である。FIG. 3 is a diagram showing another embodiment of the configuration of the transmission coil and the reception coil on the reader side and the arrangement state thereof.
【図４】図１に示した送信コイルと受信コイルとの構成
においてＩＣカードでの最良受信ポイントと最良送信ポ
イントとがずれる状況を説明する図である。FIG. 4 is a diagram illustrating a situation where the best reception point and the best transmission point in the IC card deviate from each other in the configuration of the transmission coil and the reception coil shown in FIG.
【図５】図３に示した送信コイルと受信コイルとの構成
においてＩＣカードでの最良受信ポイントと最良送信ポ
イントとが一致する状況を説明する図である。5 is a diagram illustrating a situation where the best reception point and the best transmission point in the IC card match in the configuration of the transmission coil and the reception coil shown in FIG.
【図６】図３に示した送信コイルと受信コイルとの構成
においてその配置状況の他の実施例を示す図である。FIG. 6 is a diagram showing another embodiment of the arrangement of the transmitter coil and the receiver coil shown in FIG.
１ リーダ １−５ 送信コイル １−６ 受信コイル ２ ＩＣカード ２−１ 送受信コイル ２−２ 整流器 ２−３ シャントレギュレータ ２−７ ＦＳＫ変調器 ２−８ ドライバ 1 Reader 1-5 Transmitting coil 1-6 Receiving coil 2 IC card 2-1 Transmitting / receiving coil 2-2 Rectifier 2-3 Shunt regulator 2-7 FSK modulator 2-8 Driver
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０４Ｂ 7/26 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display location H04B 7/26
Claims (1)
側と送受信コイルを有する子側とを備え、親側の送信コ
イルが作る電磁界中に子側を近づけることによって子側
の送受信コイルに電圧を誘起させ、この誘起される電圧
により子側で動作電源を作り、所定周波数の搬送信号に
データを乗せて子側の送受信コイルより親側へ送信し、
この送信信号を親側の受信コイルにて受信する非接触通
信システムであって、 前記親側において、前記送信コイルの作る電磁界中に、
一方側から他方側へ向かう磁束と他方側から一方側へ向
かう磁束とが同時に鎖交するように、前記受信コイルが
配置されていることを特徴とする非接触通信システム。1. A parent side having a transmitting coil and a receiving coil and a child side having a transmitting / receiving coil, wherein a voltage is applied to the transmitting / receiving coil on the child side by bringing the child side closer to an electromagnetic field created by the transmitting coil on the parent side. Induce it, make an operating power supply on the child side by this induced voltage, put data on a carrier signal of a predetermined frequency and transmit it from the transmitter / receiver coil on the child side to the parent side,
A non-contact communication system that receives this transmission signal at a receiving coil on the parent side, in the parent side, in an electromagnetic field created by the transmitting coil,
The non-contact communication system, wherein the receiving coil is arranged so that the magnetic flux from one side to the other side and the magnetic flux from the other side to the one side are simultaneously linked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5173599A JP3023582B2 (en) | 1993-06-22 | 1993-06-22 | Contactless communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5173599A JP3023582B2 (en) | 1993-06-22 | 1993-06-22 | Contactless communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0779182A true JPH0779182A (en) | 1995-03-20 |
| JP3023582B2 JP3023582B2 (en) | 2000-03-21 |
Family
ID=15963594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5173599A Expired - Fee Related JP3023582B2 (en) | 1993-06-22 | 1993-06-22 | Contactless communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3023582B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000055955A1 (en) * | 1999-03-18 | 2000-09-21 | Seiko Epson Corporation | Electronic device and method of controlling electronic devices |
| KR100746742B1 (en) * | 2001-02-03 | 2007-08-06 | 삼성전자주식회사 | Reader coil antenna and non-contacting type card identification system using the same |
| JP5229213B2 (en) * | 2007-02-23 | 2013-07-03 | 日本電気株式会社 | Semiconductor device for signal transmission using inductor coupling |
| WO2015008662A1 (en) * | 2013-07-16 | 2015-01-22 | 株式会社Ihi | Foreign matter detection device and method for contactless power supply device |
| JP2015023595A (en) * | 2013-07-16 | 2015-02-02 | 株式会社Ihi | Foreign matter detection device and method for non-contact power supply device |
| JP2015023752A (en) * | 2013-07-23 | 2015-02-02 | 株式会社Ihi | Foreign matter detection device and method for non-contact power supply device |
| KR20160077830A (en) * | 2014-12-24 | 2016-07-04 | 주식회사 유라코퍼레이션 | Wireless charging smart key system and wireless charging method of smart key |
| JP2017184612A (en) * | 2013-03-04 | 2017-10-05 | 船井電機株式会社 | Power feeding device |
-
1993
- 1993-06-22 JP JP5173599A patent/JP3023582B2/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000055955A1 (en) * | 1999-03-18 | 2000-09-21 | Seiko Epson Corporation | Electronic device and method of controlling electronic devices |
| US6469472B1 (en) | 1999-03-18 | 2002-10-22 | Seiko Epson Corporation | Electronic device and control method for the same |
| KR100746742B1 (en) * | 2001-02-03 | 2007-08-06 | 삼성전자주식회사 | Reader coil antenna and non-contacting type card identification system using the same |
| JP5229213B2 (en) * | 2007-02-23 | 2013-07-03 | 日本電気株式会社 | Semiconductor device for signal transmission using inductor coupling |
| US8588681B2 (en) | 2007-02-23 | 2013-11-19 | Nec Corporation | Semiconductor device performing signal transmission by using inductor coupling |
| JP2017184612A (en) * | 2013-03-04 | 2017-10-05 | 船井電機株式会社 | Power feeding device |
| WO2015008662A1 (en) * | 2013-07-16 | 2015-01-22 | 株式会社Ihi | Foreign matter detection device and method for contactless power supply device |
| JP2015023595A (en) * | 2013-07-16 | 2015-02-02 | 株式会社Ihi | Foreign matter detection device and method for non-contact power supply device |
| CN105052013A (en) * | 2013-07-16 | 2015-11-11 | 株式会社Ihi | Foreign matter detection device and method for contactless power supply device |
| US9950636B2 (en) | 2013-07-16 | 2018-04-24 | Ihi Corporation | Foreign matter detection device and method for wireless power supply device |
| JP2015023752A (en) * | 2013-07-23 | 2015-02-02 | 株式会社Ihi | Foreign matter detection device and method for non-contact power supply device |
| KR20160077830A (en) * | 2014-12-24 | 2016-07-04 | 주식회사 유라코퍼레이션 | Wireless charging smart key system and wireless charging method of smart key |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3023582B2 (en) | 2000-03-21 |
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