WO2005074158A1 - Icカード読み取り装置及びその読み取り方法 - Google Patents
Icカード読み取り装置及びその読み取り方法 Download PDFInfo
- Publication number
- WO2005074158A1 WO2005074158A1 PCT/JP2005/000787 JP2005000787W WO2005074158A1 WO 2005074158 A1 WO2005074158 A1 WO 2005074158A1 JP 2005000787 W JP2005000787 W JP 2005000787W WO 2005074158 A1 WO2005074158 A1 WO 2005074158A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- card
- communication
- transmission power
- signal
- type
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10198—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves setting parameters for the interrogator, e.g. programming parameters and operating modes
- G06K7/10217—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves setting parameters for the interrogator, e.g. programming parameters and operating modes parameter settings controlling the transmission power of the interrogator
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10297—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves arrangements for handling protocols designed for non-contact record carriers such as RFIDs NFCs, e.g. ISO/IEC 14443 and 18092
Definitions
- the present invention relates to an IC card reading device for reading or writing an IC card in a non-contact manner, and a reading method therefor.
- an IC card has been used as a prepaid card for a public telephone or a railway prepaid card.
- Non-contact IC cards There are two types of IC cards, contact type and non-contact type, and the use of non-contact type IC cards, which supply power to IC cards wirelessly, is increasing.
- Non-contact IC cards can be classified into three types: contact type, proximity type, and proximity type, depending on the communication distance.
- ISO TypeA and TypeB ISO TypeA and TypeB (IS014443 TypeA and TypeB) are widely used as proximity IC cards
- a dedicated communication IC corresponding to the Type A or Type B communication standard has been developed, and a read / write device for an IC card has been realized using the communication IC!
- Patent Document 1 describes that the signal strength of a signal received from an IC card is detected, and the wireless transmission power is switched according to the detected signal strength.
- the communication distance between the IC card and the read / write device is a communication standard.
- the communication distance differs depending on the specifications of the control unit including the IC card and the performance difference.
- the communication distance of Type A is about 2 cm
- the communication distance of Type B is about 10 cm
- a reading and writing device is simply designed using a communication IC that conforms to a specific communication standard, it is optimal for an IC card that conforms to one communication standard.
- signals can be transmitted with transmission power, but signals cannot be transmitted with appropriate transmission power to IC cards that comply with other communication standards, and IC cards with different communication standards are used. For the user There was no IC card reader that could be used.
- Patent Document 1 Japan, JP Patent Publication 2002-170082
- An object of the present invention is to provide an IC card reader that is compatible with different communication standards and is easy for a user to use.
- An IC card reader includes one or more communication control circuits for controlling transmission and reception corresponding to a plurality of communication standards of an IC card, an antenna circuit for transmitting and receiving wireless signals, and an IC card to be read.
- a transmission power supply circuit for supplying transmission power corresponding to a communication standard to the antenna circuit; and a transmission power supply for any one of the plurality of communication standards to be supplied to the transmission power supply circuit.
- a control unit for instructing.
- the communication control circuit corresponds to, for example, the communication control circuits 13 and 14 in FIG. 1, and the transmission power supply circuit is the diode 17, the transistor 18 and the linear power amplifier 16 in FIG. 1, or the attenuator 35 and the linear power amplifier in FIG. Corresponds to amplifier 16.
- the control unit when reading an IC card of a different communication standard, sets a predetermined voltage or transmission power and the voltage or transmission power.
- the communication control circuit includes at least first and second communication control circuits corresponding to first and second communication standards, and the first communication control circuit And the phase of the transmission signal of the second communication control circuit.
- the communication control circuit complies with different communication standards.
- the noise generated when switching from the transmission signal of the first communication standard to the transmission signal of the second communication standard and the noise between the transmission signal and the reception signal when the corresponding first and second communication control circuit powers Can be reduced.
- the control unit in the first reading, at the time of the first reading, supplies the largest transmission power among the plurality of communication standards! To the transmission power supply circuit, and when the signal received from the IC card conforms to the communication standard of the transmission signal, the reading of the IC card is continued, and the signal received from the IC card is the transmission signal.
- the IC card is read by instructing the transmission power supply circuit to supply the transmission power corresponding to the communication standard having the next highest transmission power.
- FIG. 1 is a circuit diagram of an IC card reader according to a first embodiment.
- FIG. 2 is a diagram showing the relationship between the antenna force distance and the magnetic field strength.
- FIG. 3 is a block diagram of an IC card reader according to a second embodiment.
- FIG. 4 is a diagram showing a relationship between an attenuator potential, a magnetic field strength, and a communication distance.
- FIG. 5 is a flowchart of an IC card reading process according to a third embodiment.
- FIG. 1 is a circuit diagram of an IC card reading device (reading / writing device) 11 according to the first embodiment.
- a CPU (control unit) 12 is a processor that performs interface control with a higher-level device, switching of transmission power, and the like, and includes, for example, a 32-bit general-purpose CPU. From the IO port of the CPU 12, a switching signal for switching between transmission and reception of Type A and Type B signals is output to the base of the transistor 18 and the communication control circuit 14.
- the communication control circuits 13 and 14 are communication control ICs that perform transmission / reception control corresponding to different communication standards, respectively.
- the communication control circuit 13 corresponds to the communication standard of 13014443-68.
- the communication control circuit 14 performs communication control, and the communication control circuit 14 The communication control corresponding to the case is performed.
- the communication control circuit 13 is supplied with a reference clock signal of the crystal oscillator 10 (for example, a 13.56 MHz signal), and internally includes a Type A synchronous carrier clock CA in phase with the reference clock signal. Generate. A type A transmission signal is generated at the timing synchronized with the synchronous carrier clock CA and output from the output terminal TxA. The synchronous carrier clock CA is also output to the clock terminal CKB of the communication control circuit 14 at the clock terminal CKA.
- a reference clock signal of the crystal oscillator 10 for example, a 13.56 MHz signal
- Type A synchronous carrier clock CA in phase with the reference clock signal.
- a type A transmission signal is generated at the timing synchronized with the synchronous carrier clock CA and output from the output terminal TxA.
- the synchronous carrier clock CA is also output to the clock terminal CKB of the communication control circuit 14 at the clock terminal CKA.
- the communication control circuit 14 generates a Type B synchronous carrier clock CB synchronized with the Type A synchronous carrier clock CA input to the clock terminal CKB, and transmits the Type B transmission signal at a timing synchronized with the synchronous carrier clock CB. And output from output terminal TxB
- the received wireless signal power also generates a clock signal for transmission. Therefore, the signal transmitted from the IC card is synchronized with the Type A synchronization carrier clock CA generated by the IC card reader 11. You can get it.
- the phases of the Type A synchronous carrier clock CA and the Type B synchronous carrier clock CB match, and the phases of the radio signals transmitted from the Type A IC card or the Type B IC card match. . Accordingly, when the IC card reader 11 switches the transmission signal to Type A force Type B or vice versa, it is possible to reduce noise generated due to a phase shift between the two signals. Also, since the phase of the signal transmitted from the IC card side matches the phase of the synchronous carrier clocks CA and CB generated by the IC card reader 11, noise generated due to the phase difference between the internal clock and the received signal is generated. Can also be reduced.
- the low-pass filter (LPF) 15 converts a rectangular wave signal output from the communication control circuit 13 into a sine wave signal and outputs the sine wave signal to the linear power amplifier 16.
- the communication control circuit 14 outputs a signal based on IS014443-TypeB from the output terminal TxB to the base of the transistor 19.
- Resistors Rl and R2 are connected in parallel to the collector of the transistor 19, and a signal is output from the resistors Rl and R2 to the linear power amplifier 16.
- the linear power amplifier 16 is supplied with the voltage Va of the power supply A for supplying transmission power corresponding to the Type A communication standard via the diode 17, and complies with the Type B communication standard.
- the voltage Vb of the power supply for B for supplying the transmission power is supplied via the transistor 18.
- the power supply voltage Va for Type A and the power supply voltage Vb for Type B have a relationship of Va and Vb, it is necessary to transmit a Type B signal by turning on the transistor 18 with the voltage Va supplied. And the power supply for Type B can be supplied to the linear power amplifier 16 as well.
- the linear power amplifier 16 selects one of a Type A signal output from the communication control circuit 13 and a Type B signal output from the communication control circuit 14 and outputs the selected signal to the antenna circuit 20.
- the linear power amplifying circuit 16 supplies a power supply voltage Va for Type A provided via the diode 17 to the antenna circuit 20.
- the linear power amplifier circuit 16 supplies the antenna circuit 20 with a Type B power supply voltage Vb given via the transistor 18.
- the antenna circuit 20 includes a capacitor C1 connected in series to a signal path, a coil L1 and a capacitor C2 connected in parallel, and converts an input signal into a radio signal and radiates it to space.
- the relationship between the distance from the antenna surface and the magnetic field strength when a radio signal is transmitted with a certain signal power from the antenna circuit 20 has characteristics as shown in FIG.
- the horizontal axis indicates the distance (mm) from the antenna surface
- the vertical axis indicates the magnetic field strength (AZm) at that point.
- the lower limit of the magnetic field strength that can be communicated between the IC card and the IC card reader 11 3 ⁇ 4), the radiation surface force of the antenna of the antenna circuit 20 is also IC. If the distance to the card exceeds ⁇ , communication will not be possible. Note that the communicable distance can be extended by increasing the transmission power of the antenna circuit 20.
- the communication distance is short, and the communication distance when transmitting Type B signals.
- the characteristics of the transmission power supplied from the linear power amplifier 16 to the antenna circuit 20 are designed to be almost the same as in FIG.
- the power supply voltage Va for Type A is about 4 V
- the power supply voltage for Type A is about 4 V. Power supply voltage to about 4.5V It is realized by doing.
- AGC 21 Automatic gain adjustment circuit 21 amplifies the signal received by antenna circuit 20 to a signal level conforming to the Type A communication standard, and outputs the signal to communication control circuit 13.
- the automatic gain adjustment circuit (AGC) 22 amplifies the signal amplified by the automatic gain adjustment circuit 21 to a signal level conforming to the Type B communication standard and outputs the signal to the communication control circuit 14.
- the CPU 12 When reading a Type A IC card, the CPU 12 outputs a switching signal C (for example, a low level signal) instructing transmission of a Type A signal to the base of the transistor 18 and the communication control circuit 14.
- a switching signal C for example, a low level signal
- the communication control circuit 14 When receiving the low-level switching signal C, the communication control circuit 14 stops outputting the transmission signal from the output terminal TxB.
- the linear power amplifier 16 supplies the power supply voltage for Type A output from the diode 17 to the antenna circuit 20, and simultaneously outputs the Type A signal output from the communication control circuit 13 to the antenna circuit 20.
- the CPU 12 When reading a Type B IC card, the CPU 12 outputs a switching signal C (for example, a high-level signal) for instructing transmission and reception of a Type B signal.
- a switching signal C for example, a high-level signal
- the communication control circuit 14 When the switching signal C of the ⁇ and ⁇ levels is input, the communication control circuit 14 outputs a Type B signal to the base of the transistor 19. This signal is amplified by the transistor 19 and supplied to the linear power amplifier 16. The linear power amplifier 16 supplies the transmission power for Type B to the antenna circuit 20 and outputs a signal. As a result, a Type B radio signal is radiated from the antenna circuit 20 into space.
- the signal received by the antenna circuit 20 is amplified by the automatic gain adjustment circuits 21 and 22, converted into Type A signal level and Type B signal level, and output to the communication control circuits 13 and 14.
- the communication control circuits 13 and 14 convert the received signal into data of a predetermined length and output it to the data bus 23.
- the CPU 12 analyzes information indicating the type of the IC card output from the communication control circuits 13 and 14, and checks whether the communication partner is a Type A IC card or a Type B IC card. Then, the CPU 12 performs communication according to the communication standard of the IC card to be read.
- the voltage applied to the linear power amplifier 16 is switched.
- the transmission power (RF power) supplied from the linear power amplifier 16 to the antenna circuit 20 to power corresponding to each communication standard
- an IC card of a different communication standard can be read by one IC card reader. 11 can be read. Also, data can be written to an IC card.
- the transmission signal is converted from a Type A signal to a Type B signal.
- the signal phase of both signals will match, so the generation of noise can be reduced.
- the CPU built in the IC card since the CPU built in the IC card generates a clock signal for transmitting the received wireless signal power, the CPU transmits the wireless signal transmitted from the IC card reader 11 and the wireless signal transmitted from the IC card. The phases can be matched. As a result, noise generated due to a phase shift between the received signal and the internal clock can be reduced.
- FIG. 3 is a block diagram of an IC card reader 31 according to the second embodiment.
- the configuration of the IC card reader 31 according to the second embodiment is basically the same as that of the IC card reader 11 according to the first embodiment. And their explanation is omitted.
- the difference between the IC card reader 31 of the second embodiment and the first embodiment is that the CPU 32 switches the Type A and Type B transmission signals by controlling the off 34, and the attenuator 35.
- the transmission power is controlled by switching the potential of the power supply.
- the CPU 32 controls an interface unit for exchanging data with the host device 33, switching the switch 34, and controlling the output potential of the attenuator ( ⁇ ) 35.
- the switch 34 selects one of the output signals of the communication control circuits 13 and 14 and outputs the selected signal to the attenuator 35 according to the instruction of the CPU 32.
- the attenuator 35 supplies a predetermined voltage to the linear power amplifier 16 according to an instruction from the CPU 32. Is output.
- the transmission power amplifier 16 amplifies the power of the transmission signal output from the communication control unit 13 or 14 and outputs it to the antenna circuit 20.
- the magnetic field strength of the radio signal output from the antenna circuit 20 is 2AZm
- the communication distance with the Type A IC card at that time is 2AZm.
- the communication distance with Type B IC card is 40mm.
- the output potential of the attenuator 35 is 2.5 V
- the magnetic field strength of the radio signal output from the antenna circuit 20 is 5 AZm
- the communication distance with the Type A IC card at that time is 110 mm
- the communication distance with the Type B IC card is 110 mm. Communication distance is 70mm.
- a communication distance of 70 mm can be secured by setting the output potential of the attenuator 35 to IV.
- a communication distance of 70 mm can be secured by setting the output potential of the attenuator 35 to 2.5 V.
- the CPU 32 When reading a Type A IC card, the CPU 32 outputs a switching signal instructing the switching unit 34 to select a Type A signal output from the communication control circuit 13, and simultaneously outputs the switching signal to the attenuator 35. Outputs a signal instructing to set the potential to IV. These signals are output using multiple IO ports of CPU32.
- the CPU 32 When reading a Type B IC card, the CPU 32 outputs a switching signal instructing the selection of a Type B signal output from the communication control circuit 14 to the switch 34, and simultaneously outputs the output potential to the attenuator 35 at 2.5 V. And outputs a signal instructing the setting.
- the CPU 32 controls the transmission electric power supplied from the linear power amplifier 16 to the antenna circuit 20 by controlling the output potential of the attenuator 35. can do.
- the magnetic field strength of the radio signal radiated from the antenna circuit 20 can be adjusted, and the communication distances to IC cards of different communication standards can be made uniform.
- FIG. 5 is a flowchart of an IC card reading process according to the third embodiment of the present invention.
- the third embodiment is an example in which the type of an IC card is determined and read when the type of the IC card to be read (compliance, communication standard) is not powerful in advance. .
- the following processing is executed by the CPU 32, for example.
- the IC card reader 31 of the third embodiment is set to transmit a Type B wireless signal having a large magnetic field distance.
- the circuit of the IC card operates by power supplied by the received wireless signal, and transmits a wireless signal based on the communication standard (TypeA or TypeB) of the IC card.
- the CPU 32 assuming that the IC card to be read is a Type B IC card, outputs the signal received by the antenna circuit 20 to the communication control circuit 14, and outputs the data output from the communication control circuit 14 to the Type B IC card. Read as data (Fig. 5, Sl l). Then, it is determined whether or not the received signal has been normally read (FIG. 5, S12).
- step S12 If the received signal can be read normally (FIG. 5, S12), the process proceeds to step S13 to read the type information of the IC card. Then, it is determined whether or not the read type information of the IC card matches the initially set communication standard (in this case, TypeB) (FIG. 5, S14). Here, the reason why the type information is confirmed is to prevent the data from being read out occasionally even when the type of the IC card is different.
- the initially set communication standard in this case, TypeB
- step S12 when it is determined that the received signal cannot be read normally (S12, NO), or in step S14, the card type information recorded inside the IC card and the transmitted signal If it is determined that the types are different (S14, NO), the process proceeds to step S16, where a Type A radio signal having a small magnetic field strength is transmitted, and the received signal is read as a Type A signal. Then, it is determined whether or not the received signal has been normally read as a Type A signal (FIG. 5, S17).
- the process proceeds to step S 18, where the type information recorded inside the IC card is read. Then, it is determined whether or not the type information recorded on the IC card matches the type of the transmitted signal (in this case, TypeA) (FIG. 5, S19).
- step S20 If the type information matches (S19, YES), the process proceeds to step S20, and the reading and writing of data into and from the IC card is continued using the low magnetic field intensity Type A radio signal.
- step S17 if the data cannot be read normally (S17, NO), or if it is determined that the type information of the IC card does not match (S19, NO), step S2
- the wireless signal is transmitted with Type B transmission power having a large magnetic field strength at first, so that the possibility of reading the wireless signal transmitted from the IC card is increased, The success rate of IC card reading can be increased.
- the present invention is not limited to the above-described embodiment, but may be configured as follows.
- the present invention is TypeA.
- the present invention is not limited to Type B, and can be applied to any communication standard of a contactless IC card.
- the circuit for varying the transmission power is not limited to the attenuator, but may be a variable power supply, a switching regulator, or the like.
- an IC card of a different communication standard can be read, a reading device that is easy for a user to use can be realized.
- IC cards of different communication standards Since the communication distances can be made uniform, it is possible to eliminate the uncomfortable feeling that the user has to change the reading distance for each IC card when reading the IC card.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05704008A EP1713185A4 (en) | 2004-02-02 | 2005-01-21 | IC CARD READER AND READ METHOD THEREFOR |
US11/496,732 US7458513B2 (en) | 2004-02-02 | 2006-07-31 | IC card reading apparatus and its related method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004025357A JP2005218020A (ja) | 2004-02-02 | 2004-02-02 | Icカード読み取り装置 |
JP2004-025357 | 2004-02-02 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/496,732 Continuation US7458513B2 (en) | 2004-02-02 | 2006-07-31 | IC card reading apparatus and its related method |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005074158A1 true WO2005074158A1 (ja) | 2005-08-11 |
Family
ID=34823978
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/000787 WO2005074158A1 (ja) | 2004-02-02 | 2005-01-21 | Icカード読み取り装置及びその読み取り方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7458513B2 (ja) |
EP (1) | EP1713185A4 (ja) |
JP (1) | JP2005218020A (ja) |
CN (1) | CN1914822A (ja) |
WO (1) | WO2005074158A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007046053A1 (en) | 2005-10-17 | 2007-04-26 | Nxp B.V. | Electronic circuit for a contactless reader device |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWM282264U (en) * | 2005-04-27 | 2005-12-01 | Chiun-Sheng Wang | Composite type card reader |
JP4839808B2 (ja) * | 2005-12-02 | 2011-12-21 | 大日本印刷株式会社 | 非接触icタグラベル |
US8013473B2 (en) * | 2006-09-01 | 2011-09-06 | Atmel Corporation | Detector based combination regulator |
US7635925B2 (en) | 2006-10-04 | 2009-12-22 | Atmel Corporation | Analog combination regulator |
JP5009025B2 (ja) * | 2007-03-30 | 2012-08-22 | 株式会社Nttファシリティーズ | カード処理装置、カード処理方法、及び、カード処理プログラム |
KR102023624B1 (ko) * | 2013-01-25 | 2019-09-20 | 삼성전자 주식회사 | Rf 전송 회로와 이를 포함하는 장치들 |
JP6208104B2 (ja) * | 2014-09-16 | 2017-10-04 | 株式会社日立製作所 | 生体認証システム、生体認証処理装置、生体認証方法、生体情報取得端末および情報端末 |
Citations (1)
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JP2003018043A (ja) * | 2001-06-29 | 2003-01-17 | Denso Corp | 通信装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
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MY109809A (en) * | 1992-11-18 | 1997-07-31 | British Tech Group Ltd | Detection of multiple articles |
FR2763445B1 (fr) * | 1997-05-16 | 1999-09-24 | Innovatron Ind Sa | Borne de communication sans contact, au moyen d'un procede a induction, avec des objets portatifs de types differents |
US6617962B1 (en) * | 2000-01-06 | 2003-09-09 | Samsys Technologies Inc. | System for multi-standard RFID tags |
JP2002170082A (ja) | 2000-12-04 | 2002-06-14 | Matsushita Electric Ind Co Ltd | 非接触icカード読取/書込装置 |
JP2003016390A (ja) * | 2001-07-03 | 2003-01-17 | Tamura Electric Works Ltd | 非接触icカードリーダライタ装置 |
US6830193B2 (en) * | 2001-11-29 | 2004-12-14 | Matsushita Electric Industrial Co., Ltd. | Non-contact IC card |
JP2005309481A (ja) * | 2004-04-16 | 2005-11-04 | Denso Wave Inc | リーダライタ、支援装置、リーダライタ支援方法及びリーダライタ支援システム |
-
2004
- 2004-02-02 JP JP2004025357A patent/JP2005218020A/ja active Pending
-
2005
- 2005-01-21 EP EP05704008A patent/EP1713185A4/en not_active Withdrawn
- 2005-01-21 CN CNA200580003846XA patent/CN1914822A/zh active Pending
- 2005-01-21 WO PCT/JP2005/000787 patent/WO2005074158A1/ja active Application Filing
-
2006
- 2006-07-31 US US11/496,732 patent/US7458513B2/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003018043A (ja) * | 2001-06-29 | 2003-01-17 | Denso Corp | 通信装置 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007046053A1 (en) | 2005-10-17 | 2007-04-26 | Nxp B.V. | Electronic circuit for a contactless reader device |
US7926719B2 (en) | 2005-10-17 | 2011-04-19 | Nxp B.V. | Electronic circuit for a contactless reader device |
Also Published As
Publication number | Publication date |
---|---|
US7458513B2 (en) | 2008-12-02 |
CN1914822A (zh) | 2007-02-14 |
JP2005218020A (ja) | 2005-08-11 |
US20070029387A1 (en) | 2007-02-08 |
EP1713185A1 (en) | 2006-10-18 |
EP1713185A4 (en) | 2009-08-26 |
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