JPH03137780A - Noncontact type ic card - Google Patents
Noncontact type ic cardInfo
- Publication number
- JPH03137780A JPH03137780A JP1274901A JP27490189A JPH03137780A JP H03137780 A JPH03137780 A JP H03137780A JP 1274901 A JP1274901 A JP 1274901A JP 27490189 A JP27490189 A JP 27490189A JP H03137780 A JPH03137780 A JP H03137780A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- cpu
- threshold level
- data
- receiving
- 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
- 230000005540 biological transmission Effects 0.000 claims abstract description 16
- 238000010586 diagram Methods 0.000 description 6
- 239000013256 coordination polymer Substances 0.000 description 2
- 238000013500 data storage Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Credit Cards Or The Like (AREA)
- Radio Transmission System (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、非接触型ＩＣカードに係り、特に受信信号
を検出するためのしきい値レベルの設定に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a contactless IC card, and particularly to setting a threshold level for detecting a received signal.
第３図に従来の非接触型ＩＣカードの構造を示す、ＣＰ
Ｕ（３１）に、入出力を制御するための入出力制御回路
であるＵ Ａ ＲＴ （３２）を介して変調回路（３３
）及び復調回路〈３４）が接続されており、これら変調
回路（３３）及び復調回路り３４）にそれぞれ送信回路
（３５）及び受信回路（３６）が接続されている。さら
に、送信回路〈３５）及び受信回路（３６）にはアンテ
ナ（３７）が接続されている。Figure 3 shows the structure of a conventional contactless IC card.CP
A modulation circuit (33) is connected to U (31) via U A RT (32), which is an input/output control circuit for controlling input/output.
) and a demodulation circuit (34) are connected, and a transmission circuit (35) and a reception circuit (36) are connected to the modulation circuit (33) and demodulation circuit (34), respectively. Further, an antenna (37) is connected to the transmitting circuit (35) and the receiving circuit (36).
アンテナ（３７〉で受信された外部からの信号は受信回
路（３６）で検出され、復調回路（３４）でアナログ信
号からデジタル信号に変換された後、ＵＡＲＴ（３２）
を介してＣＰ Ｕ （３１）に入力される。そして、Ｃ
Ｐ Ｕ （３１）でデータ処理が行われ、必要に応じて
ＣＰ Ｕ （３１）から送信信号がＵ Ａ ＲＴ （３
２）を介して変調回路（３３）に出力され、ここでデジ
タル信号からアナログ信号に変換されて送信回路（３５
）によりアンテナ（３７）から外部へ送信される。The external signal received by the antenna (37) is detected by the receiving circuit (36), converted from an analog signal to a digital signal by the demodulating circuit (34), and then sent to the UART (32).
The data is input to the CPU (31) via the CPU. And C
Data processing is performed in P U (31), and a transmission signal is sent from CPU (31) to U A RT (3
2) to the modulation circuit (33), where it is converted from a digital signal to an analog signal and sent to the transmission circuit (35).
) is transmitted from the antenna (37) to the outside.
とこ″ろで、受信回路（３６）内には予めしきい値レベ
ルが設定されており、アンテナ（３７）を介して外部か
ら入力された信号のレベルをこのしきい値レベルと比較
することにより受信信号の検出が行われる。従って、例
えば、第４図に示されるようにデータＤＩ＋及びＤＩ２
を有する入力信号ＳＩＯが受信回路（３６）に入力した
場合、受信回路（３６）のしきい値レベルが高過ぎる値
■８を有していると出力波形Ｓｌｌに示されるようにデ
ータ０１１及びＤＩ２を検出することができず、一方受
信回路（３６）のしきい値レベルが低過ぎる値ｖＬを有
していると出力波形ＳＬに示されるように真のデータＤ
１１及びＤ１□だけでなくノイズＮ１１及びＮ１２まで
データとして検出する恐れがある。このため、受信回路
（３６）は受信される信号レベル、すなわちこのＩＣカ
ードに信号を送信する外部機器の送信レベルに応じたし
きい値レベルを備える必要がある。By the way, a threshold level is set in advance in the receiving circuit (36), and by comparing the level of the signal input from the outside via the antenna (37) with this threshold level, Detection of the received signal is performed.Thus, for example, the data DI+ and DI2 are detected as shown in FIG.
When the input signal SIO having a value of 8 is input to the receiving circuit (36), if the threshold level of the receiving circuit (36) is too high, the data 011 and DI2 are output as shown in the output waveform Sll. cannot be detected, and on the other hand, if the threshold level of the receiving circuit (36) has a value vL that is too low, the true data D is not detected as shown in the output waveform SL.
There is a possibility that not only noises N11 and D1□ but also noises N11 and N12 may be detected as data. Therefore, the receiving circuit (36) needs to have a threshold level that corresponds to the received signal level, that is, the transmission level of the external device that transmits the signal to this IC card.
しかしながら、外部機器の送信レベルに応じたしきい値
レベルを設定した場合でも、そのＩＣカードをノイズが
多く発生しやすい場所で用いる等、使用環境が異なると
誤動作を生じる恐れがある。However, even when a threshold level is set according to the transmission level of an external device, malfunctions may occur if the IC card is used in a different usage environment, such as when used in a place where a lot of noise is likely to occur.
また、同じ機能を有するＩＣカードでありながらその使
用目的等により送信レベルの異なった外部機器と組み合
わせて使用されることもある。Further, even though IC cards have the same functions, they may be used in combination with external devices that have different transmission levels depending on the purpose of use.
このような場合には、使用環境及び使用条件に対応した
しきい値レベルが設定されるように受信回路（３６）を
設計し直さなければならず、このために多大の時間と労
力が必要になるという問題点があった。In such a case, the receiving circuit (36) must be redesigned to set a threshold level that corresponds to the usage environment and usage conditions, which requires a great deal of time and effort. There was a problem with that.
この発明はこのような問題点を解消するためになされた
もので、容易に異なった使用環境及び使用条件に応じた
しきい値レベルを設定することのできる非接触型ＩＣカ
ードを提供することを目的とする。This invention was made to solve these problems, and aims to provide a contactless IC card that can easily set threshold levels according to different usage environments and usage conditions. purpose.
この発明に係る非接触型ＩＣカードは、データを処理す
るためのＣＰＬＩと、ＣＰＵを作動させるためのプログ
ラムを予め格納する記憶回路と、外部とのデータの送受
信を非接触で行うためのアンテナと、それぞれ異なった
しきい値レベルを有すると共にアンテナで受信された受
信信号をそのしきい値レベルで検出する複数の受信回路
と、複数の受信回路の一つを選択してこれをＣＰＵに接
続させる選択手段と、ＣＰＵからの送信信号をアンテナ
を介して送信するための送信回路とを備えたものである
。A contactless IC card according to the present invention includes a CPLI for processing data, a storage circuit that stores a program for operating a CPU in advance, and an antenna for contactlessly transmitting and receiving data to and from the outside. , a plurality of receiving circuits each having a different threshold level and detecting a received signal received by the antenna at the threshold level, and selecting one of the plurality of receiving circuits and connecting it to the CPU. It is equipped with a selection means and a transmission circuit for transmitting a transmission signal from the CPU via an antenna.
尚、記憶回路に予め格納されているプログラムにより、
選択手段に受信回路の選択を行わせることができる。Furthermore, depending on the program stored in the memory circuit in advance,
The selection means can select the receiving circuit.
請求項１に記載の非接触型ＩＣカードにおいては、選択
手段が複数の受信回路から最適なしきい値レベルを有す
る受信回路を選択してこれをＣＰＵに接続させる。In the contactless IC card according to the first aspect, the selection means selects a receiving circuit having an optimal threshold level from the plurality of receiving circuits and connects this to the CPU.
また、請求項２に記載の非接触型ＩＣカード７では、記
憶回路に予め格納されているプログラムにより選択手段
が作動し、受信回路の選択が行われる。Further, in the non-contact type IC card 7 according to the second aspect, the selection means is operated by a program stored in advance in the storage circuit, and the reception circuit is selected.
以下、この発明の実施例を添付図面に基づいて説明する
。Embodiments of the present invention will be described below with reference to the accompanying drawings.
第１図はこの発明の一実施例に係る非接触型ＩＣカード
の構造を示すブロック図である。この非接触型ＩＣカー
ドはデータを処理するためのＣＰＵ （１）を有してお
り、このＣＰ Ｕ （１）に、ＣＰ Ｕ （１）を動作
させるためのプログラムが予め格納された記憶回路とし
てのＲＯＭ （２）、データの記憶及びＣＰ Ｏ（１）
によるデータ処理の一時記憶のためのＲＡ Ｍ （３）
、及び入出力を制御するための入出力制御回路であるＵ
Ａ ＲＴ （４）がそれぞれバス（５）を介して接続
されている。ＵＡＲＴ（４）には変調回路（６）及び復
調回路（７）が接続されており、さらに変調回路（６）
には送信回路（８）が接続され、復調回路（７）には選
択手段となるセレクタ回路（９）を介して第１〜第４の
受信回路（１０，）〜（１０，）がそれぞれ接続されて
いる。また、送信回路（８）及び第１〜第４の受信回路
（ｉｏ＋）〜（１０，）にはこれらに共通にアンテナ（
１１）が接続されている。FIG. 1 is a block diagram showing the structure of a contactless IC card according to an embodiment of the present invention. This contactless IC card has a CPU (1) for processing data, and this CPU (1) has a memory circuit in which a program for operating the CPU (1) is stored in advance. ROM (2), data storage and CP O (1)
RAM (3) for temporary storage of data processing by
, and U, which is an input/output control circuit for controlling input/output.
A RT (4) are connected to each other via a bus (5). A modulation circuit (6) and a demodulation circuit (7) are connected to the UART (4), and the modulation circuit (6)
A transmitting circuit (8) is connected to the demodulating circuit (7), and first to fourth receiving circuits (10,) to (10,) are respectively connected to the demodulating circuit (7) via a selector circuit (9) serving as a selection means. has been done. Further, the transmitting circuit (8) and the first to fourth receiving circuits (io+) to (10,) have an antenna (
11) is connected.
セレクタ回路（９）は、復調回路（ア）と第１〜第４の
受信回路（１０，）〜（１０，）との間にそれぞれ接続
された第１〜第４のスイッチ（９１）〜（９，）を有す
ると共にバス（５）を介してＣＰ Ｕ （１）に接続さ
れており、ＣＰ Ｕ （１）からの指示により四つのス
イッチ（９１）〜（９，）のうちの一つを選択的に閉成
する一方、他の三つのスイッチを開成する。また、受信
回路（１０，）〜（１０，）は互いに大きさの異なった
しきい値レベルを有している。例えば、第２図に示され
るように、第１の受信回路（１ｏ、）は数Ｖのしきい値
レベル■、を、第２の受信回路（１０ｚ）は数百ｍＶの
しきい値レベルｖ２を、第３の受信回路（１０：ｌ）は
数十ｍＶのしきい値レベル■コを、第４の受信回路（１
０，）は数ｍＶのしきい値レベルＶ、をそれぞれ有して
いる。The selector circuit (9) includes first to fourth switches (91) to (91) connected between the demodulation circuit (A) and the first to fourth receiving circuits (10,) to (10,), respectively. 9,) and is connected to the CPU (1) via the bus (5), and one of the four switches (91) to (9,) is activated by an instruction from the CPU (1). Selectively close while opening the other three switches. Further, the receiving circuits (10,) to (10,) have threshold levels that are different from each other. For example, as shown in FIG. 2, the first receiving circuit (1o,) has a threshold level of several volts, and the second receiving circuit (10z) has a threshold level of several hundred mV, v2. The third receiving circuit (10:1) has a threshold level of several tens of mV, and the fourth receiving circuit (10:1) has a threshold level of several tens of mV.
0, ) each have a threshold level V, of several mV.
次に、この実施例の動作について第２図の波形図を参照
して説明する。Next, the operation of this embodiment will be explained with reference to the waveform diagram in FIG.
まず、アンテナ（１１）で受信された外部からの信号は
各受信回路（１０，）〜Ｂｏ、）に入力し、それぞれの
しきい値レベルｖ１〜■４によりデータの検出が行われ
る。例えば、第２図に示すように、データＤ及びＤ２を
有する入力信号Ｓ。に対して受信回路（１０，）〜（１
０４＞からそれぞれ出力信号３１〜Ｓ、が得られる。First, an external signal received by the antenna (11) is input to each of the receiving circuits (10,) to Bo, ), and data is detected based on the respective threshold levels v1 to 4. For example, as shown in FIG. 2, an input signal S having data D and D2. For receiving circuits (10,) to (1
04>, output signals 31 to S are obtained, respectively.
第１の受信回路（１０１）では、入力信号Ｓ。のレベル
に比べてしきい値レベル■、が高過ぎるためにデータＤ
、及びＤ２は正確に検出されていない。また、第４の受
信回路（１０，）では、しきい値レベルＶ、が低過ぎる
ために真のデータＤ１及びＤ２のみならず周辺のノイズ
Ｎ、〜Ｎ、までデータとして検出されている。The first receiving circuit (101) receives the input signal S. The threshold level ■ is too high compared to the level of data D.
, and D2 are not detected accurately. Furthermore, in the fourth receiving circuit (10,), the threshold level V is too low, so that not only the true data D1 and D2 but also the surrounding noise N, .about.N are detected as data.
第２及び第３の受信回路（１０２）及び（１０３）では
、そのしきい値レベルｖ２及びＶ、が入力信号Ｓ。のレ
ベルに適応しているため、データＤ１及び０２のみを正
確に検出する出力信号Ｓ２及びＳ、が出力されている。In the second and third receiving circuits (102) and (103), the threshold levels v2 and V are the input signal S. Therefore, output signals S2 and S that accurately detect only data D1 and 02 are output.
従って、入力信号Ｓ。に対しては第２及び第３の受信回
路（１０２＞及び（１０３）が適していることがわかる
。Therefore, the input signal S. It can be seen that the second and third receiving circuits (102> and (103)) are suitable for this case.
ただし、しきい値レベルが高いほど受信回路における電
流消費が大きいので、正確な出力波形が得られる受信回
路のうち、しきい値レベルの低い受信回路を選択すれば
、正確で且つ電流消費効率に優れた受信が可能となる。However, the higher the threshold level, the higher the current consumption in the receiving circuit, so if you select a receiving circuit with a low threshold level from among the receiving circuits that can obtain an accurate output waveform, you can achieve accuracy and current consumption efficiency. Excellent reception is possible.
すなわち、第２図に示すようなレベルの信号Ｓ。を受信
する場合には、第３の受信回路（１０，）がｆ！１．適
となる。That is, the signal S has a level as shown in FIG. When receiving f!, the third receiving circuit (10,) receives f! 1. It becomes suitable.
そこで、セレクタ回路＜９）に第３のスイッチ（９，）
を選択するように指定する命令を、予めＲＯＭ （２）
に格納するプログラム内に挿入しておく。ＣＰＵ（１）
はこのプログラムに従って動作し、バス（５）を介して
セレクタ回路（９）に第３のスイッチ（９，）を）１釈
する旨指示を与える。これにより、セレクタ回路（９）
は、第３のスイッチ（９，）のみを選択的に閉成すると
共に残る第１、第２及び第４のスイッチ（９１）、（９
２）及び（９，）を開成する。すなわち、四つの受信回
路（１０，）〜（１０，）の中から第３の受信回路＜１
０３）が選択され、復調回路（７）、Ｕ Ａ ＲＴ （
４）及びバス（５）を介してｃ ｐ ｕ （ｉ）に接続
される。Therefore, a third switch (9,) is added to the selector circuit <9).
The instruction to select the ROM (2)
Insert it into the program stored in . CPU (1)
operates according to this program and gives an instruction to the selector circuit (9) via the bus (5) to change the third switch (9,). As a result, the selector circuit (9)
selectively closes only the third switch (9,) and closes the remaining first, second and fourth switches (91), (9,).
2) and (9,) are established. That is, from among the four receiving circuits (10,) to (10,), the third receiving circuit <1
03) is selected, and the demodulation circuit (7), U A RT (
4) and to c p u (i) via bus (5).
このため、アンテナ（１１）で受信された外部からの信
号は第３の受信回路（１０，）てしきい値レベル■。Therefore, the external signal received by the antenna (11) reaches the third receiving circuit (10,) at the threshold level ■.
によりデータの検出が行われ、さらに復調回路（７）で
アナログ信号からデジタル信号に変換された後、Ｕ Ａ
ＲＴ （４）及びバス（５）を介してＣＰ Ｕ （１
）に入力される。そして、ｃ ｐ Ｕ（１）でデータ処
理が行われ、必要に応じてデータがＲＡ Ｍ （３）に
記憶されたり、あるいはＣＰ Ｕ （１）から送信信号
がバス（５）及びＵ Ａ ＲＴ （４）を介して変調回
路（６）に出力され、ここでデジタル信号からアナログ
信号に変換されて送信回路（８）によりアンテナ（１１
）から外部へ送信される。After the data is detected by the demodulator circuit (7) and converted from an analog signal to a digital signal, the U A
CPU (1) via RT (4) and bus (5)
) is entered. Then, data processing is performed in CPU (1), and data is stored in RAM (3) as necessary, or transmission signals from CPU (1) are sent to bus (5) and U A RT ( 4) to the modulation circuit (6), where it is converted from a digital signal to an analog signal and sent to the antenna (11) by the transmission circuit (8).
) is sent to the outside.
尚、第２図に例示した入力信号Ｓ０に対しては第３の受
信回路（１０３）が最適であったが、使用環境及び使用
条件が異なるために入力信号のレベルが異なる場合には
、予めその使用環境及び使用条件に適した受信回路を選
択するようにＲＯＭ （２）に格納するプログラムを変
更しておけばよい。このように、このＩＣカードでは、
予めＲＯＭ （２）に格納するプログラムを変更するだ
けで、容易に四つのしきい値レベルから最適な一つのレ
ベルを選択して使用することができる。Although the third receiving circuit (103) was optimal for the input signal S0 illustrated in FIG. 2, if the level of the input signal differs due to different usage environments and usage conditions, The program stored in the ROM (2) may be changed to select a receiving circuit suitable for the usage environment and usage conditions. In this way, with this IC card,
By simply changing the program stored in the ROM (2) in advance, one of the four threshold levels can be easily selected and used.
また、互いに異なったしきい値レベルを有する受信回路
の個数は四つに限るものではなく、必要に応じて二つ、
三つあるいは五つ以上であってもよい。Furthermore, the number of receiving circuits having different threshold levels is not limited to four, but may be two or more as necessary.
There may be three or five or more.
尚、ＲＯＭ （２）に格納されるプログラムによりアン
テナ（１１）で受信した信号のレベルに対応させて自動
的にその都度最適な受信回路を選択するように構成する
こともできる。ただし、上記の実施例のようにＲＯＭ
（２）に格納されるプログラムで予め使用する受信回路
を決定してしまう方が、プログラムの簡略化及び応答時
間の短縮化等の点で優れている。It is also possible to configure the system to automatically select the optimum receiving circuit each time in accordance with the level of the signal received by the antenna (11) using a program stored in the ROM (2). However, as in the above embodiment, the ROM
(2) It is better to determine the receiving circuit to be used in advance using the program stored in the program in terms of program simplification and response time reduction.
さらに、この発明は非接触ＩＣカードに限らず、電波方
式で作動する種々の受信装置に利用することもできる。Furthermore, the present invention is not limited to contactless IC cards, but can also be applied to various receiving devices that operate using radio waves.
以上説明したように、この発明によれば、データを処理
するためのＣＰＵと、ＣＰＵを作動させるためのプログ
ラムを予め格納する記憶回路と、外部とのデータの送受
信を非接触で行うためのアンテナと、それぞれ異なった
しきい値レベルを有すると共にアンテナで受信された受
信信号をそのしきい値レベルで検出する複数の受信回路
と、複数の受信回路の一つを泗択してこれをＣＰＵに接
続させる選択手段と、ＣＰＵからの送信信号をアンテナ
を介して送信するための送信回路とを備えているので、
異なった使用環境及び使用条件に応じたしきい値レベル
を容易に設定することができ、汎用性の高いＩＣカード
が得られる。As explained above, according to the present invention, there is provided a CPU for processing data, a memory circuit that stores a program for operating the CPU in advance, and an antenna for contactlessly transmitting and receiving data to and from the outside. , a plurality of receiving circuits each having a different threshold level and detecting the received signal received by the antenna at the threshold level, and selecting one of the plurality of receiving circuits and transmitting it to the CPU. Since it is equipped with a selection means for connection and a transmission circuit for transmitting a transmission signal from the CPU via the antenna,
Threshold levels can be easily set according to different usage environments and usage conditions, and a highly versatile IC card can be obtained.
また、選択手段における受信回路の選択は、記憶回路に
予め格納されているプログラムにより容易に行うことが
できる。Further, the selection of the receiving circuit by the selection means can be easily performed using a program stored in advance in the storage circuit.
第１図はこの発明の一実施例に係る非接触型ＩＣカード
の構造を示すブロック図、第２図は実施例における各受
信回路の入出力特性を示す波形図、第３図は従来の非接
触型ＩＣカードを示すブロック図、第４図は第３図のＩ
Ｃカードにおける受信回路の入出力特性を示す波形図で
ある。
区において、（１）はｃｐｕ、（２）はＲＯＭ、（５）
はバス、（８）は送信回路、〈９）はセレクタ回路、（
１０，）〜（１０，）は受信回路、（１１）はアンテナ
である。
なお、各図中同一符号は同一または相当部分を示す。Fig. 1 is a block diagram showing the structure of a contactless IC card according to an embodiment of the present invention, Fig. 2 is a waveform diagram showing the input/output characteristics of each receiving circuit in the embodiment, and Fig. 3 is a conventional non-contact IC card. A block diagram showing a contact type IC card, Fig. 4 is the I of Fig. 3.
FIG. 3 is a waveform diagram showing the input/output characteristics of the receiving circuit in the C card. In the ward, (1) is CPU, (2) is ROM, (5)
is the bus, (8) is the transmitter circuit, <9) is the selector circuit, (
10,) to (10,) are receiving circuits, and (11) is an antenna. Note that the same reference numerals in each figure indicate the same or corresponding parts.
Claims (2)
る記憶回路と、 外部とのデータの送受信を非接触で行うためのアンテナ
と、 それぞれ異なったしきい値レベルを有すると共に前記ア
ンテナで受信された受信信号をそのしきい値レベルで検
出する複数の受信回路と、 前記複数の受信回路の一つを選択してこれを前記ＣＰＵ
に接続させる選択手段と、 前記ＣＰＵからの送信信号を前記アンテナを介して送信
するための送信回路と を備えたことを特徴とする非接触型ＩＣカード。(1) A CPU for processing data, a memory circuit that pre-stores a program for operating the CPU, an antenna for contactless transmission and reception of data to and from the outside, and different threshold values for each. a plurality of receiving circuits having a threshold level and detecting a received signal received by the antenna at the threshold level; and selecting one of the plurality of receiving circuits and transmitting it to the CPU.
A contactless IC card, comprising: a selection means for connecting to the CPU; and a transmission circuit for transmitting a transmission signal from the CPU via the antenna.
いるプログラムにより前記受信回路の選択を行うことを
特徴とする請求項１記載の非接触型ＩＣカード。(2) The contactless IC card according to claim 1, wherein the selection means selects the receiving circuit according to a program stored in the storage circuit in advance.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1274901A JPH03137780A (en) | 1989-10-24 | 1989-10-24 | Noncontact type ic card |
| GB9011193A GB2237479B (en) | 1989-10-24 | 1990-05-18 | Non-contact IC card |
| FR9007725A FR2653620B1 (en) | 1989-10-24 | 1990-06-20 | CONTACTLESS INTEGRATED CIRCUIT CARD. |
| US07/987,552 US6045042A (en) | 1989-10-24 | 1992-12-08 | Non-contact IC card having multiple receivers with different signal detection threshholds for minimizing current consumption |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1274901A JPH03137780A (en) | 1989-10-24 | 1989-10-24 | Noncontact type ic card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03137780A true JPH03137780A (en) | 1991-06-12 |
Family
ID=17548108
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1274901A Pending JPH03137780A (en) | 1989-10-24 | 1989-10-24 | Noncontact type ic card |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH03137780A (en) |
| FR (1) | FR2653620B1 (en) |
| GB (1) | GB2237479B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5886527A (en) * | 1996-01-26 | 1999-03-23 | Yamaha Hatsudoki Kabushiki Kaisha | Method and device for monitoring deterioration of battery |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0492482B1 (en) * | 1990-12-28 | 1996-10-23 | Mitsubishi Denki Kabushiki Kaisha | Non contact type IC-card |
| AT403416B (en) * | 1991-05-14 | 1998-02-25 | Skidata Gmbh | Card-shaped data carrier |
| JP2993186B2 (en) * | 1991-06-28 | 1999-12-20 | 株式会社デンソー | Aircraft baggage management system |
| DE4327334C1 (en) * | 1993-08-15 | 1995-01-12 | Angewandte Digital Elektronik | Chip card |
| JPH07271939A (en) * | 1994-03-30 | 1995-10-20 | Mitsubishi Denki Semiconductor Software Kk | Non-contact ic card, card reader/writer and card device |
| DE19509517C1 (en) * | 1995-03-20 | 1996-10-10 | Angewandte Digital Elektronik | Device consisting of at least one card terminal for transmitting energy to a chip card and for exchanging data with the chip card via electromagnetic waves |
| FR2781587B1 (en) * | 1998-07-21 | 2000-09-08 | Dassault Electronique | ADVANCED READER FOR NON-CONTACT BADGES |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60159265A (en) * | 1984-01-31 | 1985-08-20 | 日産自動車株式会社 | Portable radio transmitter |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1388909A (en) * | 1963-12-31 | 1965-02-12 | Csf | Refinement of receivers protected against interference |
| GB1363892A (en) * | 1970-11-10 | 1974-08-21 | Simrad As | Echo sounding apparatus with automatically regulated receiver gain |
| JPS6093976A (en) * | 1983-10-28 | 1985-05-25 | Nec Corp | Automatic detector of radar target |
| GB8615947D0 (en) * | 1986-06-30 | 1986-10-29 | Philips Electronic Associated | Pocket radio |
| EP0311312A3 (en) * | 1987-10-07 | 1990-12-12 | Smiths Industries Public Limited Company | Radar altimeter systems |
-
1989
- 1989-10-24 JP JP1274901A patent/JPH03137780A/en active Pending
-
1990
- 1990-05-18 GB GB9011193A patent/GB2237479B/en not_active Expired - Fee Related
- 1990-06-20 FR FR9007725A patent/FR2653620B1/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60159265A (en) * | 1984-01-31 | 1985-08-20 | 日産自動車株式会社 | Portable radio transmitter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5886527A (en) * | 1996-01-26 | 1999-03-23 | Yamaha Hatsudoki Kabushiki Kaisha | Method and device for monitoring deterioration of battery |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2653620B1 (en) | 1993-04-16 |
| GB2237479B (en) | 1993-11-24 |
| GB2237479A (en) | 1991-05-01 |
| FR2653620A1 (en) | 1991-04-26 |
| GB9011193D0 (en) | 1990-07-04 |
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