JP4482403B2 - Non-contact information medium - Google Patents

Non-contact information medium Download PDF

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JP4482403B2
JP4482403B2 JP2004250545A JP2004250545A JP4482403B2 JP 4482403 B2 JP4482403 B2 JP 4482403B2 JP 2004250545 A JP2004250545 A JP 2004250545A JP 2004250545 A JP2004250545 A JP 2004250545A JP 4482403 B2 JP4482403 B2 JP 4482403B2
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non
coil
contact information
information medium
reader
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JP2006067479A (en
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雅之 三浦
実 小宮
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日本発條株式会社
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Description

  The present invention relates to a non-contact information medium including a coil and a capacitor that forms a resonance circuit with the coil.

  Information media are classified into contact type and non-contact type depending on the communication method between the IC chip built in the medium and the reader / writer. Among these, the non-contact type does not cause contact failure because there is no contact with the reader / writer, and can be moved away from the reader / writer. The non-contact type has features such as being resistant to dirt, rain, and static electricity, and has high security.

  For example, a non-contact information medium obtains operating power by electromagnetic induction using radio waves received from a reader / writer, and exchanges information with the reader / writer using radio waves of a predetermined frequency. For this reason, the non-contact information medium and the reader / writer each have an antenna for transmitting and receiving radio waves of a predetermined frequency.

  A conventional non-contact information medium controls a processing operation of a coil that forms an antenna unit that receives electric power from outside and transmits and receives information, a capacitor that forms a resonance circuit with the coil, and a non-contact information medium. IC chip. In order for this non-contact information medium to operate, the non-contact information medium is brought close to a reader / writer that emits radio waves for transmission and reception. As a result, the coil and the capacitor of the non-contact information medium resonate and an induced current is generated in the coil. The induced current becomes power for the IC chip to operate the IC chip, and the non-contact information medium transmits information to the reader / writer via the coil. As described above, the non-contact information medium and the reader / writer transmit and receive information by performing wireless communication (see Patent Document 1).

JP 2001-34725 A

  However, the conventional non-contact information medium has a problem that wireless communication between the non-contact information medium and the reader / writer cannot be performed accurately when a plurality of non-contact information media overlap. This is because when non-contact information media are overlapped, strong mutual interference occurs between the coils of the non-contact information medium, resulting in disordered resonance frequency and unstable communication or inability to communicate. is there.

  Furthermore, in order to communicate with all the plurality of non-contact information media in the communicable area, the reader / writer needs to supply power to each non-contact information medium. However, when the non-contact information medium overlaps and the resonance frequency of the non-contact information medium is disturbed, the reader / writer cannot receive power from the reader / writer and the IC chip does not start. Further, the non-contact information medium cannot perform wireless communication with the reader / writer.

  The present invention has been made in view of the above-described drawbacks of the prior art, and enables accurate communication even when a single non-contact information medium or a plurality of non-contact information media are overlapped. An object is to provide a non-contact information medium.

  In order to solve the above-described problems and achieve the object, a non-contact information medium according to the present invention is a non-contact information medium including a coil and a capacitor that forms a resonance circuit with the coil. A lumped constant inductor is provided in the resonance circuit to cause resonance at a resonance frequency capable of communicating with a reader / writer in the resonance circuit.

  The non-contact information medium according to the present invention is characterized in that the lumped constant inductor mainly forms an inductance of the resonance circuit.

  The non-contact information medium according to the present invention is characterized in that the lumped constant inductor is a discrete circuit component and / or a small coil.

  Further, the non-contact information medium according to the present invention is characterized in that the lead wire forming the coil is wound in comparison with a single multi-turn coil that forms a resonance circuit that generates resonance at a resonance frequency communicable with the reader / writer. It is characterized by a small number.

  The non-contact information medium according to the present invention is characterized in that the conducting wire forming the coil has a smaller winding shape than the multi-turn coil.

  According to the non-contact information medium of the present invention, a lumped constant type inductor that causes resonance at a resonance frequency capable of communicating with a reader / writer in a resonance circuit is provided in a part of the coil to reduce mutual interference between the coils. In addition, since the resonance frequency of the resonance circuit formed by the coil and the capacitor is matched with the frequency of the radio wave emitted from the reader / writer, even when a single non-contact information medium is arranged, a plurality of overlapping states Even if it is arrange | positioned by this, there exists an effect that exact communication can be performed between reader / writers.

  Hereinafter, a non-contact information medium according to an embodiment of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments. In the description of the drawings, the same parts are denoted by the same reference numerals.

  First, the non-contact information medium according to the embodiment will be described. In the non-contact information medium in this embodiment, a lumped constant type inductor that causes a resonance circuit to generate resonance at a resonance frequency communicable with a reader / writer is provided in a part of a coil, and the frequency of a radio wave emitted from the reader / writer And the resonance frequency of the resonance circuit of the non-contact information medium are matched.

  FIG. 1 is a diagram showing a schematic configuration of a non-contact information medium 10 according to the present embodiment. Here, FIG. 1 schematically shows a non-contact information medium 10. As shown in FIG. 1, the non-contact information medium 10 includes a coil 20, a chip coil 30, a capacitor 40, and an IC chip 50. The coil 20 and the capacitor 40 are connected at connection portions 61 and 62.

  As shown in FIG. 1, the coil 20 is provided around the outside of the IC chip 50. A part of the coil 20 is provided with a chip coil 30 which is a discrete circuit component that functions as a lumped constant type inductor. The capacitor 40 has a predetermined capacity and a function of storing energy, and forms a resonance circuit in cooperation with the coil 20 and the chip coil 30. The chip coil 30 mainly forms the inductance of the resonance circuit in the non-contact information medium 10. The chip coil 30 may be a discrete circuit component that is a non-winding inductor in addition to a discrete circuit component that is a winding inductor.

  The resonance frequency of the resonance circuit formed by the coil 20, the chip coil 30, and the capacitor 40 is set to match the frequency of the radio wave transmitted by the reader / writer. For this reason, the coil 20 and the chip coil 30 have an inductance that makes the resonance frequency of the resonance circuit formed by the coil 20, the chip coil 30 and the capacitor 40 equal to the frequency of the radio wave emitted from the reader / writer. In other words, the chip coil 30 has a function of causing a resonance circuit in the non-contact information medium 10 to resonate at a resonance frequency that allows communication with the reader / writer. Therefore, when the non-contact information medium 10 comes close to a reader / writer that emits radio waves of a predetermined frequency, the resonance circuit formed by the coil 20, the chip coil 30 and the capacitor 40 resonates, and an induced current is generated in this resonance circuit. . The resonant circuit supplies this induced current to the IC chip 50.

  In addition, the coil 20 forms an antenna unit that receives a transmission radio wave from the reader / writer and outputs the radio wave to the IC chip 50 and transmits a signal output from the IC chip 50 to the reader / writer.

  The IC chip 50 includes a control unit 51, a transmission / reception unit 52, and a storage unit 53, and controls information transmitted and received by the non-contact information medium 10. The control unit 51 controls processing operations of the transmission / reception unit 52 and the storage unit 53. The transmission / reception unit 52 processes the transmission radio wave received from the reader / writer received by the coil 20, extracts information requested by the reader / writer from the storage unit 53, and transmits a signal corresponding to the extracted information to the coil 20. The storage unit 53 stores various types of information including identification information for identifying the non-contact information medium 10. The IC chip 50 is supplied with an induced current from a resonance circuit formed by the coil 20, the chip coil 30 and the capacitor 40, and a voltage value corresponding to the induced current becomes an operable voltage value of the IC chip 50. Start operation.

  Next, the shape of the coil 20 of the non-contact information medium 10 will be described. FIG. 2 is a diagram for explaining the shape of the coil 20. As shown in FIG. 2, the coil 20 is formed by winding the conducting wire once. For this reason, the value of the inductance La of the coil 20 is lower than the inductance of the multi-turn coil formed by winding the conducting wire a plurality of times. In addition, a chip coil 30 having an inductance Lb is provided on a part of the conducting wire forming the coil 20.

FIG. 3 is a diagram showing a circuit diagram of the non-contact information medium 10. As shown in FIG. 3, the coil 20 and the chip coil 30 are electrically connected in series. The capacitor 40, the coil 20 and the chip coil 30 are electrically connected in parallel. Here, the chip coil 30 can be regarded as a lumped-constant type inductor that can be lumped-constant because the physical size of the circuit element is sufficiently small and the inductance can be regarded as being locally concentrated. For this reason, the inductance of the inductor of the resonance circuit in the non-contact information medium 10 is the sum of the inductance La of the coil 20 and the inductance Lb of the chip coil 30. The chip coil 30 mainly forms the inductance of the resonance circuit of the non-contact information medium 10, and the inductance La of the coil 20 is smaller than the inductance Lb of the chip coil 30.

Therefore, the frequency fr of the resonance circuit formed by the coil 20, the chip coil 30, and the capacitor 40, the inductance La of the coil 20, the inductance Lb of the chip coil 30, and the capacitance C of the capacitor 40 are expressed by the following equation (1). Have a relationship.
The inductance La of the coil 20 and the inductance Lb of the chip coil 30 are set so that the resonance frequency fr of this resonance circuit matches the frequency fc of the transmission / reception radio wave in the reader / writer. Here, when the resonance frequency of the resonance circuit in the non-contact information medium matches the frequency of the radio wave transmitted by the reader / writer, a large induced current flows in the resonance circuit of the non-contact information medium. In the present embodiment, since the resonance frequency fr of the resonance circuit in the non-contact information medium 10 and the frequency fc of the radio wave transmitted by the reader / writer are set to coincide with each other, the non-contact information medium 10 includes the reader / writer. Can be supplied with high efficiency.

  In the present embodiment, the coil 20 has a smaller inductance value than the coil of the non-contact information medium according to the prior art because the number of turns of the conductive wire is reduced. Therefore, in the non-contact information medium 10, the inductance value of the inductor forming the resonance circuit is increased to some extent by supplementing with the inductance Lb of the chip coil 30 as the inductance of the coil 20 is reduced. The resonance frequency fr of 10 is matched with the frequency fc of the transmission radio wave of the reader / writer.

  For this reason, in the non-contact information medium 10, it is not necessary to increase the capacity of the capacitor as the inductance value of the coil 20 decreases. In the non-contact information medium 10, for example, the capacity of the capacitor 40 can be set to a value substantially equal to the capacity of the capacitor of the non-contact information medium according to the conventional technology. Therefore, the non-contact information medium 10 does not need to have a larger component size of the capacitor 40 than the conventional one, so that the non-contact information medium 10 can be downsized. Further, in the non-contact information medium 10, it is not necessary to increase the capacity of the capacitor 40 in response to a decrease in the inductance value of the coil 20, so that the power load on the capacitor 40 is small and sufficient power can be supplied to the IC chip 50. . As a result, the non-contact information medium 10 can prevent malfunction of the IC chip 50 due to power shortage, and can perform stable wireless communication with the reader / writer 70.

  Next, a communication system using the non-contact information medium 10 will be described with reference to FIG. As shown in FIG. 4, the reader / writer 70 that transmits / receives information to / from the non-contact information medium 10 processes the information to be transmitted / received with the input unit 71 that inputs instruction information that instructs the processing operation of the reader / writer 70. It has a processing unit 72, an output unit 73 that outputs transmitted / received information, and an antenna 74 that supplies power and transmits / receives information via radio waves of a predetermined frequency. Since the reader / writer 70 has an anti-collision function, it can receive information from a plurality of non-contact information media at once.

  The non-contact information medium 10 is set so that the resonance frequency fr of the resonance circuit formed by the coil 20, the chip coil 30 and the capacitor 40 matches the frequency fc of the radio wave emitted from the reader / writer. For this reason, as shown in FIG. 4, when the single non-contact information medium 10 receives the radio wave transmitted from the antenna 74, an induced current is generated in the resonance circuit. As a result, the non-contact information medium 10 activates the IC chip 50 and transmits the response information Db in response to the response request information Da transmitted from the reader / writer 20. Therefore, when the non-contact information medium 10 is disposed alone, wireless communication between the non-contact information medium 10 and the reader / writer 70 is performed accurately.

  Here, the mutual interference between the coils generated when a plurality of coils are close to each other is related by the number of turns of the conductive wire forming each coil. In other words, as the number of turns of the conductive wire of each coil increases, the inductance of the coil increases, and the non-contact information medium is significantly affected by mutual interference. As a result, the resonance frequency of the resonance circuit formed by the coil and the capacitor is disturbed, and the communication state in the non-contact information medium becomes unstable and communication is impossible.

  As shown in FIG. 5, the conventional non-contact information medium 100 adjusts the capacitance of the capacitor 140 by increasing the inductance of the coil 120 to a predetermined value by winding a conducting wire a plurality of times. That is, in a conventional non-contact information medium, in order to form a resonance circuit that generates resonance at a resonance frequency that can communicate with a reader / writer using a single coil, a multi-turn coil is provided as a coil that forms the resonance circuit. There was a need. As shown in FIG. 6, the conventional non-contact information medium 100 a arranged alone transmits response information Df corresponding to the response request information De transmitted from the reader / writer 20, and wirelessly communicates with the reader / writer 70. Communication can be performed. However, the conventional non-contact information media 100b and 100c, which are partially overlapped with each other, have a large number of windings of the conductive wire of the coil 120. The influence of the generated mutual interference is remarkably affected, and the resonance frequency is disturbed. As a result, the non-contact information media 100b and 100c cannot accurately transmit the response information Df corresponding to the response request information De and cannot perform accurate wireless communication with the reader / writer 70. .

  On the other hand, in the non-contact information medium 10 according to the present embodiment, the conducting wire forming the coil 20 is only wound once, compared with the multi-turn coil in the conventional non-contact information medium, The conductive wire to be formed has a small number of turns. For this reason, even when a plurality of non-contact information media 10 overlap, mutual interference between the coils 20 of the non-contact information media 10 is less likely to occur compared to conventional non-contact information media.

  Furthermore, the mutual interference between the coils generated when a plurality of coils are close to each other is related by the shape of the conducting wire forming each coil. In other words, the larger the shape of each coil, the larger the overlapping area of the coils. Therefore, the non-contact information medium is significantly affected by mutual interference. As a result, the resonance frequency of the resonance circuit formed by the coil and the capacitor is disturbed, and the communication state in the non-contact information medium becomes unstable and communication is impossible.

  In the non-contact information medium 10, the chip coil 30 having the inductance Lb has a sufficiently small physical size of the circuit element, and the shape of the chip coil 30 is small. For this reason, even when a plurality of non-contact information media 10 are overlapped, the area where the chip coils 30 overlap each other is small, and mutual interference between the chip coils 30 hardly occurs.

  As a result, even when a plurality of non-contact information media 10 overlap each other, compared to the conventional case, mutual interference between the coils 20 does not occur, and the resonance frequency in the resonance circuit in each non-contact information medium 10 is disturbed. Therefore, each non-contact information medium 10 can perform accurate wireless communication with the reader / writer. For example, even when a plurality of non-contact information media 10 are arranged so as to overlap each other with no gap like the non-contact information media group 10A shown in FIG. The response information Dc is transmitted according to the response request information Da, and accurate wireless communication with the reader / writer 70 can be performed.

  In addition, the non-contact information medium 10 includes the chip coil 30 having the inductance Lb, so that the ratio of the capacitance of the capacitor 40 and the inductance of the inductor in the resonance circuit is substantially equal to that of the conventional non-contact information medium. it can. Therefore, even when a plurality of non-contact information media 10 are overlapped, the resonance intensity Q can be maintained at a predetermined value or more, and the power supply from the reader / writer 70 can be efficiently received. As a result, the IC chip 50 of each non-contact information medium 10 can start up smoothly, and the non-contact information medium 10 can prevent a communication failure due to a start-up failure of the IC chip 50.

  As described above, in the non-contact information medium 10 according to the present embodiment, the number of turns of the coil 20 is set to only one to prevent mutual interference between the coils 20. In the non-contact information medium 10, the chip coil 30 is further provided so that the resonance frequency fr of the resonance circuit of the non-contact information medium 10 matches the frequency fc of the radio wave emitted from the reader / writer 70. As a result, the non-contact information medium 10 according to the present embodiment is accurate with the reader / writer 70 regardless of whether the non-contact information medium 10 alone or a plurality of non-contact information media 10 are overlapped. Wireless communication can be performed.

  Further, since the non-contact information medium 10 can maintain the resonance intensity Q at a predetermined value or more, the non-contact information medium 10 alone or a plurality of non-contact information media 10 overlap each other. The power supply from the reader / writer 70 can be received efficiently. Furthermore, the chip coil 30 can set a highly accurate inductance value as compared with a wire-wound inductor formed by winding a conducting wire. For this reason, the non-contact information medium 10 can increase the degree of coincidence between the resonance frequency of the resonance circuit in the non-contact information medium 10 and the frequency of the transmission radio wave from the reader / writer, and can efficiently supply power from the reader / writer 70. Can receive.

  In addition, as this Embodiment, although the non-contact information medium 10 which provided the chip coil 30 in the vicinity of the connection part 61 was demonstrated, not only this but in the vicinity of the connection part 61 as shown in FIG. The non-contact information medium 11 in which the chip coil 30 is provided at a location near the center of the conducting wire of the coil 20 may be used. In order to increase the inductance value of the inductor of the resonance circuit of the non-contact information medium 10, the chip coil 30 is only required to be connected in series with the coil 20 in an electric circuit. That is, it is sufficient that the chip coil 30 is provided on the conducting wire of the coil 20.

  Further, as the present embodiment, the non-contact information medium 10 provided with the single chip coil 30 has been described. However, the present invention is not limited to this, and the non-contact information medium provided with a plurality of chip coils 30 as shown in FIG. 12 is also acceptable. It is sufficient that the sum of the inductance of the plurality of chip coils 30 and the inductance of the coil 20 is set so that the resonance frequency fr of the resonance circuit formed with the capacitor 40 matches the radio wave fc emitted from the reader / writer 70.

  Moreover, as this Embodiment, as shown in FIG. 10, it is good also as the non-contact information medium 13 which has the coil 21 which made the winding shape of the conducting wire wound small. The conducting wire forming the coil 21 is smaller in winding shape than the coil 120 of the conventional non-contact information medium 100 shown in FIG. The smaller the winding shape of the conducting wire forming the coil, the smaller the inductance of this coil. For this reason, compared with the conventional non-contact information medium, the coil 21 can further reduce the influence of the mutual interference between the coils 21. Note that it is sufficient that the inductance of the chip coil 30 and the inductance of the coil 21 are set so that the resonance frequency fr of the resonance circuit formed with the capacitor 40 matches the radio wave fc emitted from the reader / writer 70.

  Furthermore, as shown in FIG. 11, it is good also as the non-contact information medium 14 which has the coil 22 which wound the conducting wire twice, for example. The non-contact information medium according to the present embodiment only needs to have a smaller number of turns of the conductive wire forming the coil than at least the conventional non-contact information medium. This is because the non-contact information medium according to the present embodiment can reduce the influence of mutual interference between the coils as compared with the related art by reducing the number of windings of the conductive wires forming the coils. In this case, it is sufficient that the inductance of the chip coil 30 and the inductance of the coil 22 are set so that the resonance frequency fr of the resonance circuit formed with the capacitor 40 matches the radio wave fc emitted from the reader / writer 70.

  Moreover, although the non-contact information medium 10 provided with the chip coil 30 has been described as the present embodiment, the present invention is not limited to this, and a small coil 230 formed with the same wiring pattern as that of the coil 20 is provided as shown in FIG. The non-contact information medium 210 provided may be used. The inductance Lc of the small coil 230 and the inductance La of the coil 20 are set so that the resonance frequency fr of the resonance circuit formed with the capacitor 40 matches the radio wave fc emitted from the reader / writer 70. For this reason, the non-contact information medium 210 can accurately perform wireless communication with the reader / writer 70 even if it is a single unit. Further, since the non-contact information medium 210 can reduce the number of turns of the coil 20 similarly to the non-contact information medium 10, the mutual interference between the coils 20 can be reduced. Even if they overlap, wireless communication can be performed accurately. It is sufficient that the small coil 230 is provided on the conducting wire forming the coil 20. Moreover, the small coil 230 may be provided not only with one but with two or more. In this case, the value obtained by adding the inductance Lc of each small coil 230 corresponds to the value of the inductance La of the coil 20, and the radio wave fc emitted from the reader / writer 70 with the resonance frequency fr of the resonance circuit formed with the capacitor 40. It is sufficient to set to match. The small coil 230 may be formed by etching a conductor with a predetermined wiring pattern or by winding a conductive wire in a spiral shape in a plane.

  In the present embodiment, a non-contact information medium that does not have a battery function is described. However, the present invention is not limited to this, and a non-contact information medium that has a battery function may be used. Even in such a case, disabling communication due to mutual interference between the coils can be prevented by providing a lumped constant type inductor for resonance with the capacitor in a part of the coil.

It is a block diagram which shows schematic structure of the non-contact information medium concerning embodiment. It is a figure explaining the shape of the coil shown in FIG. It is a figure which shows the circuit diagram of the non-contact information medium shown in FIG. It is a figure explaining the radio | wireless communication between the non-contact information medium shown in FIG. 1, and a reader / writer. It is a figure which shows the outline of the non-contact information medium concerning a prior art. It is a figure explaining the radio | wireless communication between the non-contact information medium shown in FIG. 5, and a reader / writer. It is a figure explaining the radio | wireless communication between the non-contact information medium shown in FIG. 1, and a reader / writer. It is a block diagram which shows the other example of schematic structure of the non-contact information medium concerning embodiment. It is a block diagram which shows the other example of schematic structure of the non-contact information medium concerning embodiment. It is a figure explaining the other example of the shape of the coil shown in FIG. It is a figure explaining the other example of the shape of the coil shown in FIG. It is a block diagram which shows the other example of schematic structure of the non-contact information medium concerning embodiment.

Explanation of symbols

10, 100, 100a, 100b, 100c, 11, 12, 13, 14, 210 Non-contact information medium 10A Non-contact information medium 20, 120 Coil 30 Chip coil 40, 140 Capacitor 50, 150 IC chip 51 Control unit 52 Transmission / reception unit 53 Storage Unit 61, 62 Connection Unit 70 Reader / Writer 71 Input Unit 72 Processing Unit 73 Output Unit 74 Antenna 230 Small Coil

Claims (4)

  1. In a non-contact information medium comprising a coil formed by winding a conducting wire and a capacitor that forms a resonance circuit with the coil,
    A lumped constant inductor that is a discrete circuit component that is connected in series to the coil , has a locally concentrated inductance, and causes the resonant circuit to generate resonance at a resonant frequency that is communicable with a reader / writer,
    The non-contact information medium, wherein the lumped constant type inductor mainly forms an inductance of the resonance circuit.
  2. The non-contact information medium according to claim 1, wherein the coil is formed by winding the conductive wire once or twice.
  3. The conductive wire forming the coil has a smaller winding shape than a single multi-turn coil forming a resonance circuit that generates resonance at a resonance frequency communicable with the reader / writer. Or the non-contact information medium of 2.
  4. The lumped inductor, the noncontact information medium according to any one of claims 1-3, characterized in that provided on the conductor.
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