JP2008027015A - Noncontact ic card - Google Patents

Noncontact ic card Download PDF

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JP2008027015A
JP2008027015A JP2006196350A JP2006196350A JP2008027015A JP 2008027015 A JP2008027015 A JP 2008027015A JP 2006196350 A JP2006196350 A JP 2006196350A JP 2006196350 A JP2006196350 A JP 2006196350A JP 2008027015 A JP2008027015 A JP 2008027015A
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card
antenna
charging
communication
additional function
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Hidetoshi Ozawa
英敏 男澤
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Dai Nippon Printing Co Ltd
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Dai Nippon Printing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a noncontact IC card charging power sufficient for driving an additional function in a short time. <P>SOLUTION: In the noncontact IC card 10 for transfering data between an IC 12 for card and a noncontact reader writer 30 by radio communication a charging antenna 17 for charging power for displaying data on a display section 16 is disposed as well as an antenna 11 for communication between the IC 12 for card and noncontact reader writer 30. A rectifying circuit 18 rectifies electromagnetic wave acquired from the charging antenna 17 to direct current voltage, and charges an electric double layer capacitor 19. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、非接触ＩＣカードに関し、特に、表示機能等の付加機能のための電力を効率良く充電するための技術に関する。   The present invention relates to a non-contact IC card, and more particularly to a technique for efficiently charging power for an additional function such as a display function.

近年、無線通信により外部との情報の授受を行う非接触ＩＣカードの利用が飛躍的に増えてきており、様々な分野に利用されている。特に、最近では、情報の授受を行うだけでなく、表示デバイスを搭載し、ＩＣチップに記録されている情報を表示させる機能等の付加機能を持った非接触ＩＣカードが登場している。   In recent years, the use of non-contact IC cards for exchanging information with the outside by wireless communication has increased dramatically and is used in various fields. In particular, recently, contactless IC cards that not only exchange information but also have additional functions such as a function of displaying information recorded on an IC chip have been introduced.

このような付加機能を搭載する場合には、その駆動のための電力が必要になるため、従来に比べて多くの電力を必要とすることになる。このため、情報の授受等のためのアンテナとは別に、付加機能専用のアンテナを独立して設け、電力を確保する技術が提案されている（特許文献１参照）。
特開２００４−２６５１７６号公報 When such an additional function is mounted, power for driving the function is required, so that more power is required than in the conventional case. For this reason, a technique has been proposed in which an antenna dedicated to an additional function is provided separately from an antenna for transmitting and receiving information and the like to ensure power (see Patent Document 1).
JP 2004-265176 A

しかしながら、上記特許文献１に記載の発明では、外部から電力供給を受けた場合にしか駆動できないため、任意のタイミングで付加機能を駆動することができないという問題がある。   However, the invention described in Patent Document 1 has a problem that it cannot be driven at an arbitrary timing because it can be driven only when power is supplied from the outside.

そこで、本発明は、付加機能を駆動するのに充分な電力を、短時間で充電することが可能な非接触ＩＣカードを提供することを課題とする。   Accordingly, an object of the present invention is to provide a non-contact IC card that can be charged in a short time with power sufficient to drive an additional function.

上記課題を解決するため、本発明では、ＩＣと外部とのデータの授受を無線通信により行う非接触ＩＣカードであって、前記ＩＣと外部との通信用のアンテナである通信用アンテナと、前記データの授受以外の機能である付加機能を実行する付加機能実行手段と、前記付加機能実行手段の電力確保用のアンテナである充電用アンテナと、前記充電用アンテナから得られた電磁波を直流電圧に整流する整流回路と、前記整流回路により整流された直流電圧を充電する電気二重層キャパシタとを有する非接触ＩＣカードを提供する。   In order to solve the above-described problem, the present invention provides a contactless IC card that performs data communication between an IC and the outside by wireless communication, the communication antenna being an antenna for communication between the IC and the outside, Additional function executing means for executing an additional function other than data exchange, a charging antenna that is an antenna for securing power of the additional function executing means, and an electromagnetic wave obtained from the charging antenna to a DC voltage A non-contact IC card having a rectifying circuit for rectifying and an electric double layer capacitor for charging a DC voltage rectified by the rectifying circuit is provided.

本発明によれば、非接触ＩＣカードにおいて、ＩＣ駆動用のアンテナとは別に表示機能等の付加機能用のアンテナを設けるとともに、このアンテナから得られた電力を充電する電気二重層キャパシタを設けたため、付加機能を駆動するのに充分な電力を、短時間で充電することが可能となるという効果を奏する。   According to the present invention, in the non-contact IC card, an antenna for an additional function such as a display function is provided in addition to the antenna for driving the IC, and an electric double layer capacitor for charging power obtained from the antenna is provided. Thus, there is an effect that it is possible to charge the power sufficient to drive the additional function in a short time.

以下、本発明の好適な実施形態について、図面を参照して詳細に説明する。
（１．非接触ＩＣカードの構成）
まず、本発明に係る非接触ＩＣカードの構成について説明する。図１は、本発明に係る非接触ＩＣカードの機能ブロック図である。 DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
(1. Configuration of contactless IC card)
First, the configuration of the non-contact IC card according to the present invention will be described. FIG. 1 is a functional block diagram of a non-contact IC card according to the present invention.

図１において、１０はＩＣカード、１１は通信用アンテナ、１２はカード用ＩＣ、１３はＣＰＵ、１４はメモリ、１５はドライバＩＣ、１６は表示部、１７は充電用アンテナ、１８は整流回路、１９は電気二重層キャパシタ、３０は非接触型リーダライタである。   In FIG. 1, 10 is an IC card, 11 is a communication antenna, 12 is a card IC, 13 is a CPU, 14 is a memory, 15 is a driver IC, 16 is a display unit, 17 is a charging antenna, 18 is a rectifier circuit, 19 is an electric double layer capacitor, and 30 is a non-contact type reader / writer.

図１に示すように、本発明に係るＩＣカード１０は、通信用アンテナ１１、カード用ＩＣ１２、ＣＰＵ１３、メモリ１４、ドライバＩＣ１５、表示部１６、充電用アンテナ１７、整流回路１８、電気二重層キャパシタ１９を有しており、通信用アンテナ１１を介して、非接触型リーダライタ３０との通信を行うとともに、充電用アンテナ１７を介して表示用の電力を非接触型リーダライタ３０から得るようになっている。   As shown in FIG. 1, an IC card 10 according to the present invention includes a communication antenna 11, a card IC 12, a CPU 13, a memory 14, a driver IC 15, a display unit 16, a charging antenna 17, a rectifier circuit 18, and an electric double layer capacitor. 19 so as to communicate with the non-contact type reader / writer 30 through the communication antenna 11 and to obtain display power from the non-contact type reader / writer 30 through the charging antenna 17. It has become.

ＩＣカード１０において、通信用アンテナ１１、カード用ＩＣ１２は、通常のＩＣカードが有するものと同一であり、ＩＣカードの必須機能となるものである。ＣＰＵ１３、メモリ１４、ドライバＩＣ１５、表示部１６は上記必須機能に対して付加機能を実現するためのものであり、本実施形態では表示機能を実現している。   In the IC card 10, the communication antenna 11 and the card IC 12 are the same as those in a normal IC card, and are essential functions of the IC card. The CPU 13, the memory 14, the driver IC 15, and the display unit 16 are for realizing an additional function with respect to the essential functions. In the present embodiment, the display function is realized.

図１中、通信用アンテナ１１は、カード用ＩＣ１２へ入出力するためのデータの送受信およびデータ入出力のための電力の供給を受けるためのものであり、ＩＣカード１０を構成する基材内部において、コイル状に巻かれたものとなっている。カード用ＩＣ１２は、データを記録するためのＩＣチップである。ＣＰＵ１３は、カード用ＩＣ１２に記録されたデータを処理するための演算処理装置である。本実施形態においては、表示部１６に対するデータの表示処理も行う。メモリ１４は、表示部１６に表示させるデータの記憶領域である。ドライバＩＣ１５は、表示部１６にデータを表示させるためのＩＣである。表示部１６は、データを表示するためのものであり、例えばＴＮ、ＳＴＮ等のネマチック液晶表示媒体、コレステリック液晶媒体、強誘電性液晶媒体、電子ペーパー、発光ダイオード等を用いることができる。   In FIG. 1, a communication antenna 11 is for receiving / transmitting data for input / output to / from the card IC 12 and supplying power for data input / output. It has been wound in a coil shape. The card IC 12 is an IC chip for recording data. The CPU 13 is an arithmetic processing unit for processing data recorded in the card IC 12. In the present embodiment, data display processing on the display unit 16 is also performed. The memory 14 is a storage area for data to be displayed on the display unit 16. The driver IC 15 is an IC for displaying data on the display unit 16. The display unit 16 is for displaying data. For example, a nematic liquid crystal display medium such as TN or STN, a cholesteric liquid crystal medium, a ferroelectric liquid crystal medium, electronic paper, or a light emitting diode can be used.

充電用アンテナ１７は、付加機能用の電力の供給を受けるためのものであり、通信用アンテナ１１と同様、ＩＣカード１０を構成する基材内部において、コイル状に巻かれたものとなっている。整流回路１８は、非接触型リーダライタ３０から充電用アンテナ１７が受信した電磁波を整流して直流電圧に変換する機能を有している。電気二重層キャパシタ１９は、整流回路１８による整流により得られた直流電圧を電力として蓄積する機能を有している。   The charging antenna 17 is for receiving power supply for additional functions, and is wound in a coil shape inside the base material constituting the IC card 10, similarly to the communication antenna 11. . The rectifier circuit 18 has a function of rectifying electromagnetic waves received by the charging antenna 17 from the non-contact type reader / writer 30 and converting the electromagnetic waves into a DC voltage. The electric double layer capacitor 19 has a function of storing a DC voltage obtained by rectification by the rectifier circuit 18 as electric power.

上述のように、通信用アンテナ１１と充電用アンテナ１７は共に、コイル状に巻かれて基材内部に形成されている。この２つのアンテナはＩＣカード１０内の平面方向に互いに重なり合わないように配置することが望ましい。平面方向に重なり合わないように配置した場合の例を図２（ａ）に示す。図２（ａ）の例では、通信用アンテナ１１を太線で、充電用アンテナ１７を細線で示している。図２（ａ）に示すように、平面方向に重なり合わないように配置する手法としては、非接触ＩＣカード１０のカード基材上において、一方の側（図中左側）に通信用アンテナ１１をコイル状に巻いて配置し、他方の側（図中右側）に充電用アンテナ１７をコイル状に巻いて配置する手法がある。   As described above, both the communication antenna 11 and the charging antenna 17 are wound in a coil shape and formed inside the substrate. These two antennas are preferably arranged so as not to overlap each other in the plane direction in the IC card 10. FIG. 2 (a) shows an example in which they are arranged so as not to overlap in the plane direction. In the example of FIG. 2A, the communication antenna 11 is indicated by a thick line, and the charging antenna 17 is indicated by a thin line. As shown in FIG. 2A, as a method of arranging so as not to overlap in the planar direction, the communication antenna 11 is provided on one side (left side in the figure) on the card base of the non-contact IC card 10. There is a technique in which the charging antenna 17 is coiled and arranged on the other side (right side in the figure).

また、重なり合ってしまう場合でも、平面方向において重なる部分ができるだけ少なくするようにすることが望ましい。平面方向において重なる部分をできるだけ少なくなるように配置した場合の例を図２（ｂ）に示す。図２（ｂ）の例でも、図２（ａ）と同様、通信用アンテナ１１を太線で、充電用アンテナ１７を細線で示している。図２（ｂ）に示すように、平面方向において重なる部分をできるだけ少なくなるように配置する手法としては、非接触ＩＣカード１０のカード基材上において、外周側に通信用アンテナ１１をコイル状に巻いて配置し、その内周側に充電用アンテナ１７をコイル状に巻いて配置する手法がある。   Even if they overlap, it is desirable to minimize the number of overlapping portions in the plane direction. FIG. 2B shows an example in which the overlapping portions in the plane direction are arranged so as to be as small as possible. In the example of FIG. 2B as well, the communication antenna 11 is indicated by a thick line and the charging antenna 17 is indicated by a thin line, as in FIG. As shown in FIG. 2B, as a method of arranging the overlapping portions in the planar direction as small as possible, the communication antenna 11 is coiled on the outer peripheral side on the card base of the non-contact IC card 10. There is a method in which the charging antenna 17 is wound and arranged on the inner peripheral side thereof in a coil shape.

上述のように、通信用アンテナ１１と充電用アンテナ１７を平面方向において重なる部分をできるだけ少なくしたとしても、アンテナが近隣に複数本存在する場合、それぞれが干渉して受信の効率が低下し、通信不良などの不具合が発生する場合がある。そこで、これらについては、通信阻害を発生させないように、その周波数特性を調整しておく。具体的には、通信用アンテナ１１と充電用アンテナ１７を重ねた状態での共振周波数が、非接触型リーダライタ３０の搬送周波数と等しくなるように調整する。規格により定められた非接触型リーダライタ３０の搬送周波数が１３．５６ＭＨｚであるので、２本のアンテナの共振周波数が１３．５６ＭＨｚとなるよう設定することになる。このように２本のアンテナの周波数特性を調整しておくと、通信阻害が発生せず、充電時間も短くなる。   As described above, even if the overlapping portion of the communication antenna 11 and the charging antenna 17 in the planar direction is reduced as much as possible, when there are a plurality of antennas in the vicinity, interference occurs due to interference between the antennas and the communication. Defects such as defects may occur. Therefore, the frequency characteristics of these are adjusted so as not to cause communication inhibition. Specifically, the resonance frequency when the communication antenna 11 and the charging antenna 17 are overlapped is adjusted to be equal to the carrier frequency of the non-contact type reader / writer 30. Since the carrier frequency of the non-contact type reader / writer 30 determined by the standard is 13.56 MHz, the resonance frequency of the two antennas is set to be 13.56 MHz. If the frequency characteristics of the two antennas are adjusted in this way, communication hindrance does not occur and the charging time is shortened.

（２．処理動作）
続いて、図１に示したＩＣカード１０の処理動作について説明する。ＩＣカード１０を非接触型リーダライタ３０に近付けると、ＩＣカード１０は通信用アンテナ１１および充電用アンテナ１７の両方を介して通信を開始する。通信用アンテナ１１においては、双方向に情報のやりとりを行う。具体的には、カード用ＩＣ１２に記録された情報を非接触型リーダライタ３０に送信するとともに、非接触型リーダライタ３０から受信した情報をカード用ＩＣ１２に記録する処理等を行うことになる。この際、必要な駆動電力は、通信用アンテナ１１が非接触型リーダライタ３０から得ることになる。 (2. Processing operation)
Next, the processing operation of the IC card 10 shown in FIG. 1 will be described. When the IC card 10 is brought close to the non-contact type reader / writer 30, the IC card 10 starts communication via both the communication antenna 11 and the charging antenna 17. The communication antenna 11 exchanges information bidirectionally. Specifically, the information recorded in the card IC 12 is transmitted to the non-contact type reader / writer 30 and the information received from the non-contact type reader / writer 30 is recorded in the card IC 12. At this time, the necessary driving power is obtained from the non-contact type reader / writer 30 by the communication antenna 11.

このように、カード用ＩＣ１２と非接触型リーダライタ３０の間において情報のやりとりが行われている際、並行して充電用アンテナ１７は、非接触型リーダライタ３０から電磁波を受信する。そして、整流回路１８が受信した電磁波を整流して直流電圧に変換する。さらに電気二重層キャパシタ１９が、変換された直流電圧を電力として蓄積していく。このようにして、通信用アンテナ１１側で情報のやりとりが行われている間、充電用アンテナ１７側では、付加機能用の電力を得るための充電が行われることになる。   Thus, when information is exchanged between the card IC 12 and the non-contact type reader / writer 30, the charging antenna 17 receives electromagnetic waves from the non-contact type reader / writer 30 in parallel. Then, the electromagnetic wave received by the rectifier circuit 18 is rectified and converted into a DC voltage. Further, the electric double layer capacitor 19 accumulates the converted DC voltage as electric power. In this way, while information is being exchanged on the communication antenna 11 side, charging for obtaining additional function power is performed on the charging antenna 17 side.

そして、カード用ＩＣ１２に記録されたデータを表示部１６に表示させる場合には、電気二重層キャパシタ１９に蓄積された電力を利用してＣＰＵ１３がカード用ＩＣ１２からデータを抽出してメモリ１４に渡し、ドライバＩＣ１５がメモリに保持されたデータを表示部１６に表示させる。   When the data recorded in the card IC 12 is displayed on the display unit 16, the CPU 13 extracts the data from the card IC 12 using the power stored in the electric double layer capacitor 19 and passes it to the memory 14. The driver IC 15 displays the data held in the memory on the display unit 16.

非接触型リーダライタ３０とカード用ＩＣ１２の間のデータのやりとりについては、上述のように通信用アンテナ１１から得られる電力を利用するため、ＩＣカード１０が非接触型リーダライタ３０から離れた場合には、電力供給がされず、実行することができない。一方、表示部１６へのデータの表示は、電気二重層キャパシタ１９に蓄積された電力を利用して行うため、ＩＣカード１０が非接触型リーダライタ３０から離れていても、表示を行うことが可能である。   Regarding the exchange of data between the non-contact type reader / writer 30 and the card IC 12, the power obtained from the communication antenna 11 is used as described above, so that the IC card 10 is separated from the non-contact type reader / writer 30. Is not powered and cannot be executed. On the other hand, since the data is displayed on the display unit 16 by using the electric power stored in the electric double layer capacitor 19, it can be displayed even if the IC card 10 is away from the non-contact type reader / writer 30. Is possible.

以上、本発明の好適な実施形態について説明したが、本発明は上記実施形態に限定されず、種々の変形が可能である。例えば、上記実施形態では、付加機能として表示機能を備えた場合について説明したが、付加機能として音声を発する発音機能等を備えるようにしても良い。   The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made. For example, in the above embodiment, the case where the display function is provided as the additional function has been described. However, a sound generation function that emits sound may be provided as the additional function.

本発明に係る非接触ＩＣカードの機能ブロック図である。It is a functional block diagram of a non-contact IC card according to the present invention. 通信用アンテナ１１と充電用アンテナ１７の配置を示す平面図である。4 is a plan view showing the arrangement of communication antennas 11 and charging antennas 17.

符号の説明Explanation of symbols

１０・・・ＩＣカード
１１・・・通信用アンテナ
１２・・・カード用ＩＣ
１３・・・ＣＰＵ
１４・・・メモリ
１５・・・ドライバＩＣ
１６・・・表示部
１７・・・充電用アンテナ
１８・・・整流回路
１９・・・電気二重層キャパシタ
３０・・・非接触型リーダライタ

10 ... IC card 11 ... Communication antenna 12 ... Card IC
13 ... CPU
14 ... Memory 15 ... Driver IC
DESCRIPTION OF SYMBOLS 16 ... Display part 17 ... Charging antenna 18 ... Rectifier circuit 19 ... Electric double layer capacitor 30 ... Non-contact type reader / writer

Claims (3)

ＩＣと外部とのデータの授受を無線通信により行う非接触ＩＣカードであって、
前記ＩＣと外部との通信用のアンテナである通信用アンテナと、
前記データの授受以外の機能である付加機能を実行する付加機能実行手段と、
前記付加機能実行手段の電力確保用のアンテナである充電用アンテナと、
前記充電用アンテナから得られた電磁波を直流電圧に整流する整流回路と、
前記整流回路により整流された直流電圧を充電する電気二重層キャパシタと、
を有することを特徴とする非接触ＩＣカード。 A non-contact IC card that exchanges data between the IC and the outside by wireless communication,
A communication antenna which is an antenna for communication between the IC and the outside;
An additional function executing means for executing an additional function which is a function other than the data exchange;
A charging antenna that is an antenna for securing power of the additional function executing means;
A rectifier circuit that rectifies electromagnetic waves obtained from the charging antenna into a DC voltage;
An electric double layer capacitor for charging a DC voltage rectified by the rectifier circuit;
A non-contact IC card comprising: 前記通信用アンテナと充電用アンテナは、その共振周波数が、外部のＩＣリーダライタから出力される搬送周波数と等しくなるように調整されたものであることを特徴とする請求項１に記載の非接触ＩＣカード。   The contactless antenna according to claim 1, wherein the communication antenna and the charging antenna are adjusted so that a resonance frequency thereof is equal to a carrier frequency output from an external IC reader / writer. IC card. 前記通信用アンテナと充電用アンテナは共にカード基材内部にコイル状に形成されたものであり、カードの平面方向において互いに重なり合わないように配置されていることを特徴とする請求項１または請求項２に記載の非接触ＩＣカード。


The communication antenna and the charging antenna are both formed in a coil shape inside the card substrate, and are arranged so as not to overlap each other in the plane direction of the card. Item 3. A non-contact IC card according to item 2.


JP2006196350A 2006-07-19 2006-07-19 Noncontact ic card Pending JP2008027015A (en)

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