JP2012068931A - Non-contact type ic card - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact type IC card free from occurrence of interference between RF modules, free from occurrence of errors in IC card modules based on reception of nonstandard data, and capable of setting a plurality of non-contact type card functions having different frequencies of a carrier wave in one card.SOLUTION: A non-contact type IC card mounts, as a RF module, one RF module (a common radio circuit) 10 capable of transmitting and receiving respective carrier waves used by a plurality of card processing circuits, detects a frequency of a receiving carrier wave, and includes a selective starting control part 20 for selectively starting either one IC card module of a plurality of IC card modules (card processing circuits) 30-1, 30-2 based on the detected frequency of the receiving carrier wave.

Description

  The present invention relates to a non-contact type IC card, and more particularly to a non-contact type IC card that allows a plurality of types of non-contact type card functions having different carrier frequencies used for communication to be contained in a single card.

  Recently, non-contact type IC cards are used in various industrial fields. As this non-contact type IC card, an electronic money IC card using a 13.56 MHz carrier wave, a 125 KHz carrier wave, and the like. There are known an RFID card that uses a carrier wave, a data communication card that uses a 4.48 GHz carrier wave, an ETC card that uses a 5.8 GHz carrier wave, and the like.

  By the way, in this type of non-contact type IC card, an RF module (wireless circuit) used in each standard and an IC card module (card processing circuit) for performing card processing are mounted in a one-to-one relationship.

  Since the non-contact type IC card having such a configuration is different for each type of card, if the number of non-contact type IC cards to be used increases, one person should have several non-contact type IC cards. This kind of non-contact type IC card is increasing year by year.

  Therefore, if one non-contact type IC card is provided with a plurality of non-contact type IC card functions having different carrier frequencies used for communication, the RF module used in each standard for each card It is necessary to mount a plurality of pairs with the IC card module.

  As described above, as a non-contact type IC card in which a plurality of pairs of RF modules and IC card modules are mounted on a single card and a single card has a plurality of non-contact type IC card functions. Is described in Patent Document 1.

JP 2007-287128 A

  However, in the non-contact type IC card described in Patent Document 1, since a plurality of pairs of RF modules and IC card modules are mounted on one card, the occurrence of interference between the RF modules and unnecessary. An error for power supply to the IC card module occurs.

  FIG. 5 shows a conventional configuration of a contactless IC card in which a plurality of pairs of an antenna RF module and an IC card module are mounted on one card. In the non-contact type IC card shown in FIG. 5, the first pair of the RF module 510 and the IC card module 530-1 and the second pair of the RF module 520 and the IC card module 530-2 are mounted.

  The RF module 510 transmits and receives a carrier wave having a frequency used by the IC card module 530-1, and includes a power supply circuit 511 that generates power by electromagnetic induction of the received carrier wave. The RF module 520 transmits and receives a carrier wave having a frequency used by the IC card module 530-2, and has a power supply circuit 521 that generates power by electromagnetic induction of the received carrier wave.

  The IC card module 530-1 performs communication processing with a corresponding card reader / writer (not shown) using modulation of a carrier wave transmitted and received with the RF module 510. Further, the IC card module 530-2 performs communication processing with a corresponding card reader / writer (not shown) using modulation of a carrier wave transmitted and received with the RF module 520.

  With such a configuration, this non-contact type IC card has a first non-contact type IC card function by the IC card module 530-1 and a second non-contact type IC card function by the IC card module 530-2. This can be realized with a single card.

  However, since this non-contact type IC card has two RF modules 510 and 520 mounted thereon, interference may occur between the RF module 510 and the RF module 520.

  Also, when this non-contact type IC card is held over a card reader / writer that supports the non-contact type card function using the IC card module 530-1, for example, the RF module 510 receives the carrier wave from the card reader / writer. The power generated by the power supply circuit 511 is supplied to the IC card module 530-1 and the received data is transmitted to the IC card module 530-1. At this time, the RF module 520 also operates simultaneously to supply power. Power is supplied from the circuit 521 to the IC card module 530-2, and received data is transmitted to the IC card module 530-2.

  In this case, the IC card module 530-2 receives non-standard data, so that the processing becomes impossible and an error occurs.

  Therefore, the present invention eliminates the occurrence of interference between RF modules and eliminates the occurrence of errors in the IC card module based on the reception of nonstandard data, thereby providing a plurality of contactless card functions having different carrier frequencies. An object of the present invention is to provide a non-contact type IC card that can be stored in a single card.

  In order to achieve the above object, the invention of claim 1 is a non-contact type that is driven by electric power generated by electromagnetic induction of a carrier wave conveyed from a reader / writer and communicates with the reader / writer by modulation of the carrier wave. A plurality of card processing circuits having different carrier frequencies used for communication, a common wireless circuit capable of transmitting and receiving each carrier used by the plurality of card processing circuits, and reception by the common wireless circuit A frequency detection means for detecting the frequency of the carrier wave from the reader / writer, and one card processing circuit that uses the carrier wave of the frequency among the plurality of card processing circuits based on the frequency detected by the frequency detection means. Identifying means; and selective activation control means for selectively activating one card processing circuit identified by the identifying means To Bei.

  According to a second aspect of the present invention, in the first aspect of the invention, the frequency detection unit is configured to perform analog-digital conversion on a carrier wave from the reader / writer received by the common wireless circuit, and to output a pulse signal; and A switch circuit that is turned on to pass a pulse signal output from the analog-to-digital conversion circuit when the amplitude of the carrier wave is stable; and a sampling timer that starts measuring a predetermined sampling time by turning on the switch circuit; A pulse counter that counts pulses of a pulse signal output from the analog-digital conversion circuit that has passed through the switch circuit during a time measured by the sampling timer, and the specifying means includes the plurality of card processing circuits. The sampling count data of each carrier used by the A storage storing means, and comparator means for identifying the one card processing circuit by comparing the sampling count data stored in the count data and the storage means of the pulse counter.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the selective activation control unit selectively supplies power to one card processing circuit specified by the specifying unit. Received data received by the common radio circuit is selectively supplied to the card processing circuit.

According to the present invention,
(1) Since a plurality of types of contactless card functions with different carrier frequencies can be stored in a single card, it is not necessary to carry a plurality of types of contactless IC cards for each application. (2) As an RF module Since one common radio circuit capable of transmitting and receiving each carrier wave used by a plurality of card processing circuits is used, no interference occurs between RF modules, and the mounting space of the RF modules can be reduced. (3) Since one card processing circuit specified by the specifying means is selectively activated, it is possible to prevent the occurrence of an error based on the inability to process due to reception of nonstandard data, and the activated card processing circuit is Since there is only one, there are effects such as saving power.

FIG. 1 is a block diagram showing a schematic configuration of a non-contact type IC card according to the present invention. FIG. 2 is a block diagram showing a detailed configuration of the non-contact type IC card shown in FIG. FIG. 3 is a waveform diagram for explaining the operation of the non-contact type IC card shown in FIG. FIG. 4 is a flowchart for explaining processing of the non-contact type IC card shown in FIG. FIG. 5 is a block diagram showing a schematic configuration of a conventional non-contact type IC card. FIG. 6 is a block diagram showing another schematic configuration of the non-contact type IC card according to the present invention.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a block diagram showing a schematic configuration of a non-contact type IC card according to the present invention.

  In the contactless IC card according to the present invention, as an RF module, one RF module (common radio circuit) 10 capable of transmitting and receiving each carrier used by a plurality of card processing circuits is mounted, and the frequency of the received carrier is used. Corresponding to the above, there is provided a selective activation control unit 20 that selectively activates one of the IC card modules (card processing circuits) 30-1 and 30-2.

  The RF module 10 includes a power supply circuit 11 that receives a carrier wave from a card reader / writer (not shown) and generates electric power by electromagnetic induction of the carrier wave. The RF module 10 transmits / receives a carrier wave modulated by ASK modulation or the like to / from a corresponding card reader / writer.

  Here, since the RF module 10 transmits and receives carrier waves used by the IC card modules 30-1 and 30-2, it can transmit and receive carrier frequencies used by the IC card modules 30-1 and 30-2. It consists of a wide-band RF module.

  The selective activation control unit 20 is driven by receiving power from the power supply circuit 11 of the RF module 10. In addition, the selection activation control unit 20 specifies one IC card module using the corresponding frequency from the IC card modules 30-1 and 30-2 corresponding to the frequency of the carrier wave received by the RF module 10.

  The selective activation control unit 20 selectively activates one identified IC card module, and supplies power and transmits received data only to the activated IC card module.

  The selective activation of one IC card module by the selective activation control unit 20 is performed by chip select signals CS1 and CS2 output from the selective activation control unit 20. For example, when the frequency of the received carrier wave corresponds to the frequency of the carrier wave used in the IC card module 30-1 among the IC card modules 30-1 and 30-2, the chip to be transmitted to the IC card module 30-1. The select signal CS1 is turned on, and the chip select signal CS2 transmitted to the IC card module 30-2 is turned off. As a result, power is supplied to the IC card module 30-1 and transmission of received data is performed, but power is not supplied to the IC card module 30-2 and reception data is not transmitted.

  Thus, according to the non-contact type IC card of the present invention, one RF module 10 capable of transmitting and receiving each carrier used by the plurality of IC card modules 30-1 and 30-2 is used as the RF module. Therefore, no interference occurs between the RF modules, and one IC card module specified by the selective activation control unit 20, for example, the IC card module 30-1, is selectively activated, so that other IC cards An error based on the inability to process due to reception of nonstandard data by the module 30-2 does not occur.

  FIG. 2 is a block diagram showing a detailed configuration of the non-contact type IC card shown in FIG.

  2, the selective activation control unit 20 shown in FIG. 1 includes a crystal oscillator 21, an A / D conversion circuit 22, a switch circuit 23, a pulse counter 24, a sampling timer 25, a reception circuit 26, a memory 27, and sampling count data. The part including the table 28 and the CPU 29 corresponds. In the non-contact type IC card shown in FIG. 1, the case where two IC card modules 30-1 and 30-2 are mounted is shown. However, in the non-contact type IC card shown in FIG. A case where two IC card modules 30-1, 30-2, 30-3, and 30-4 are mounted is shown. The other parts are the same as those of the non-contact type IC card shown in FIG. 1. In FIG. 2, the same reference numerals as those in FIG.

  In the non-contact type IC card shown in FIG. 2, the pulse counter 24 counts the wave number (amplitude number) of the carrier wave within a certain period of time measured by the sampling timer 25, for example, a sampling period of 1 ms. An IC card module that uses a carrier wave of a corresponding frequency is identified from the two IC card modules 30-1, 30-2, 30-3, and 30-4, and the identified IC card module is selectively activated.

  When the RF module 10 receives a carrier wave, the power supply circuit 11 generates power by electromagnetic induction of the carrier wave. The electric power generated by the power supply circuit 11 is supplied to each part of the non-contact type IC card and drives the crystal oscillator 21 that generates a clock signal for driving the CPU 29.

  The carrier wave received by the RF module 10 is output to the A / D conversion circuit 22, where it is converted into a pulse signal for counting the wave number of the carrier wave.

  When the amplitude of the carrier wave received by the RF module 10 is stabilized, the power circuit 11 outputs a power detection signal. This power detection signal is applied to the switch circuit 22 that opens and closes the pulse signal output from the A / D conversion circuit 22. The switch circuit 22 is opened (ON) by this power detection signal, passes the pulse signal output from the A / D conversion circuit 22, and is added to the pulse counter 24.

  When the switch circuit 22 is opened, a sampling timer 25 that starts a certain sampling period is started by the output of the switch circuit 22.

  The pulse counter 24 counts the number of pulses of the pulse signal output from the A / D conversion circuit 22 within the sampling period counted by the sampling timer 25 under the control of the CPU 29.

  In the sampling count data table 28, the sampling count corresponding to the frequency of the carrier used in each IC card module 30-1, 30-2, 30-3, 30-4, that is, the counting data of the wave number within a certain sampling period. Each data is stored.

  The CPU 29 compares the count data of the pulse counter 24 with the sampling count data stored in advance in the sampling count data table 28, and the frequency of the carrier wave received by the RF module 10 is four IC card modules 30-1, By checking which IC card module 30-2, 30-3, or 30-4 corresponds to the frequency of the carrier wave, the IC card module is specified.

  Of the chip select signals CS1, CS2, CS3 and CS4 corresponding to the IC card modules 30-1, 30-2, 30-3 and 30-4, the chip corresponding to the specified IC card module. Only the select signal is turned on and the other chip select signals are turned off.

  The RF module 10 outputs received data to the receiving circuit 26 based on the received carrier wave. The receiving circuit 26 stores this received data in the memory 27 and transmits it to the CPU 29.

  The CPU 29 transmits the received data received to the IC card modules 30-1, 30-2, 30-3, 30-4 by serial communication.

  Here, since only the chip select signal corresponding to one IC card module specified by the CPU 29 among the IC card modules 30-1, 30-2, 30-3, 30-4 is ON, the CPU 29 The transmitted reception data is received by one IC card module in which this chip select signal is ON, and the RF module 10 receives one IC card module in which this chip select signal is ON. Power is applied from the power supply circuit 11, whereby only one IC card module whose chip select signal is ON is selectively activated.

  The transmission data from one selectively activated IC card module is output to the RF module 10, and the RF module 10 transmits this transmission data to a card reader / writer (not shown) by modulation of the corresponding carrier wave.

  The card processing in the IC card modules 30-1, 30-2, 30-3, 30-4 differs depending on the respective functions, and the IC card modules 30-1, 30-2, 30- 3 and 30-4 can use well-known configurations, and detailed description thereof will be omitted.

  FIG. 3 is a waveform diagram for explaining the operation of the non-contact type IC card shown in FIG. In FIG. 3, three types of carriers shown in FIGS. 3A, 3 </ b> C, and 3 </ b> E are shown as carriers received by the RF module 10. In the non-contact type IC card shown in FIG. 2, the pulse counter 24 counts the wave number (amplitude number) of the carrier wave within a certain sampling period timed by the sampling timer 25.

  For example, if the carrier wave received by the RF module 10 is as shown in FIG. 3A, the pulse counter 24 counts “16”, and the carrier wave received by the RF module 10 is as shown in FIG. The pulse counter 24 counts “32”, and when the carrier wave received by the RF module 10 is as shown in FIG. 3E, the pulse counter 24 counts “64”. Then, the corresponding IC card module is specified based on the count data.

  3B shows ASK modulation components used in the corresponding IC card module when the carrier wave received by the RF module 10 is as shown in FIG. 3A. FIG. 3D shows the RF module. FIG. 3F shows the ASK modulation component used in the corresponding IC card module when the carrier wave received by 10 is as shown in FIG. 3C. FIG. 3F shows the carrier wave received by the RF module 10 in FIG. The ASK modulation component used in the corresponding IC card module in the case of

  FIG. 4 is a flowchart for explaining processing of the non-contact type IC card shown in FIG.

  When this process is started and the RF module 10 receives a carrier wave (step 401), the crystal oscillator 21 is driven, and then it is checked whether the amplitude of the received carrier wave is stabilized (step 402). If it is determined that the amplitude of the carrier wave is not stable (NO in step 402), the process returns to step 402 and waits for the amplitude of the received carrier wave to become stable.

  If it is determined in step 402 that the amplitude of the received carrier wave is stable (YES in step 402), the switch circuit 23 is turned on (step 403), and the sampling timer 25 is started (step 404). Then, the pulse counter 24 starts counting the number of pulses of the pulse signal output from the A / D conversion circuit 22 (step 405).

  Next, it is checked whether the count is finished, that is, whether the sampling period measured by the sampling timer 25 is finished (step 406). If the count is not finished, the process returns to step 406 and waits for the end of the count. (YES in step 406), the count data of the pulse counter 24 and the sampling count data of the sampling count data table 28 are compared (step 407), and the four IC card modules 30-1, 30-2, 30-3, It is checked whether or not a corresponding frequency exists among the frequencies of the carrier wave used by 30-4 (step 408).

  If it is determined that the corresponding frequency does not exist (NO in step 408), the process returns to step 401. If it is determined that the corresponding frequency exists (YES in step 408), the carrier wave of the corresponding frequency is determined. Only the chip select signal corresponding to the IC card module to be used is turned ON to selectively activate the IC card module (step 409), and communication using the activated IC card module is started (step 410).

  Then, it is checked whether the communication using the activated IC card module is completed (step 411). If the communication is not completed (NO in step 411), the process returns to step 411 to wait for the communication to end. If it is determined in step 411 that the communication has ended (YES in step 411), the oscillation of the crystal oscillator 21 is stopped, and the processing of this non-contact type IC card is ended.

  Although the above is an example of typical embodiment of this invention, this invention is not limited to the Example shown in the said Example and drawing, It can implement suitably deform | transforming within the range which does not change the summary. It is.

  For example, in the non-contact type IC card shown in FIG. 2, the received data received by the receiving circuit 26 is directly added to the CPU 29, and the received data from the CPU 29 is sent to the IC card modules 30-1, 30-2, 30-3, 30-. 4 is transmitted by serial communication, but as shown in FIG. 6, it is driven by the CPU 29 by the chip select signal CS5 which is turned on when any of the chip select signal CS1, CS2, CS3 or CS4 is turned on. The drive circuit 290 is provided, and the received data received by the receiving circuit 26 is transmitted via the drive circuit 290 to the IC card modules 30-1, 30-2, 30-3, 30-4 by serial communication. May be.

10, 510, 520 RF module (common radio circuit)
DESCRIPTION OF SYMBOLS 11, 511, 521 Power supply circuit 20 Selection start control part 21 Crystal oscillator 22 A / D conversion circuit 23 Switch circuit 24 Pulse counter 25 Sampling timer 26 Reception circuit 27 Memory 28 Sampling count data table 29 CPU
30-1, 30-2, 30-3, 30-4, 530-1, 530-2 IC card module (card processing circuit)
290 Drive circuit

Claims (3)

A non-contact type IC card that is driven by electric power generated by electromagnetic induction of a carrier wave conveyed from a reader / writer, and communicates with the reader / writer by modulation of the carrier wave,
A plurality of card processing circuits each having a different carrier frequency used for the communication;
A common radio circuit capable of transmitting and receiving each carrier used by the plurality of card processing circuits;
A frequency detection means for detecting a frequency of a carrier wave from the reader / writer received by the common radio circuit;
Specifying means for specifying one card processing circuit using a carrier wave of the frequency among the plurality of card processing circuits based on the frequency detected by the frequency detection means;
A non-contact type IC card comprising: a selection activation control unit that selectively activates one card processing circuit identified by the identification unit. The frequency detection means includes
An analog-to-digital conversion circuit that performs analog-to-digital conversion on a carrier wave from the reader / writer received by the common wireless circuit and outputs a pulse signal;
When the amplitude of the carrier wave is stable, a switch circuit that is turned on and passes a pulse signal output from the analog-digital conversion circuit;
A sampling timer that starts measuring a predetermined sampling time by turning on the switch circuit;
A pulse counter that counts the pulses of the pulse signal output from the analog-digital conversion circuit that has passed through the switch circuit during the time measured by the sampling timer, and
The specifying means is:
Storage means for storing in advance sampling count data of each carrier used by the plurality of card processing circuits;
The non-contact type IC card according to claim 1, further comprising: a comparison unit that identifies the one card processing circuit by comparing the count data of the pulse counter and the sampling count data stored in the storage unit. The selective activation control means includes
The power is selectively supplied to one card processing circuit specified by the specifying means, and the reception data received by the common radio circuit is selectively supplied to the one card processing circuit. The non-contact type IC card according to 1 or 2.

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