JP4550472B2 - Information recording medium - Google Patents

Description

  The present invention relates to an information recording medium having both a non-contact type IC chip that performs non-contact type communication with an external device and a contact type IC chip that performs contact type communication with an external device. An optimum representative example of the information recording medium referred to in the present invention is an IC card, but in addition, for example, an IC tag or a medium having an IC having a card-like or booklet-like form. Is also applicable.

  2. Description of the Related Art Conventionally, an IC card using an IC chip or the like is becoming widespread for the purpose of storing and processing important and large amounts of data such as a cash card and an ID card. In recent years, not only an IC card (contact IC card) equipped with a contact IC chip (contact IC chip) that performs communication by contacting an external terminal of an IC card and a terminal of an external device but also has an antenna coil. However, the use of IC cards (non-contact type IC cards) including non-contact type IC chips (non-contact type IC chips) that communicate with external devices in a non-contact manner by radio waves or magnetic fields is increasing. Such a non-contact type IC card does not need to be in contact with a terminal of an external device, so that the use of the card is simple and has an advantage that maintenance of the external terminal can be reduced. Because of these advantages, the demand for non-contact IC cards or non-contact IC tags is increasing.

  By the way, for example, a case where a plurality of such non-contact type IC cards are used in a state where a plurality of such non-contact type IC cards are stacked in a container such as a card slot is assumed. In such a situation where a plurality of non-contact type IC cards overlap, the electromagnetic waves received by the antenna coils of the respective IC cards interfere with each other, and compared with the case where only one IC card is used. Adverse effects such as a decrease in sensitivity and distortion of the waveform of the electromagnetic wave are assumed. Therefore, anti-collision measures are desired.

  From the viewpoint of preventing these adverse effects, for example, Patent Document 1 discloses a conductor constituting a loop antenna (corresponding to an antenna coil) arranged in a substantially rectangular and substantially plate-like electronic device at the corner of the electronic device. There has been proposed a technique for forming a shape that does not overlap in a portion located in the vicinity.

Patent Document 2 proposes a technique related to an IC card that is formed by detouring so that the area where the antenna coils overlap each other is reduced when two IC cards are stacked facing each other.
JP 2002-222400 A JP 2000-113143 A

By the way, with the need for higher functionality and multi-functionality of IC cards and the like, IC cards that can be used not only as a non-contact type but also as a contact type are desired (particularly non-contact type). There is a demand for the development of a two-chip IC card in which an IC chip and a contact IC chip are separately mounted on one medium.
However, in the case of an IC card, for example, the mounting position of the contact IC module is defined by JISX6303. Therefore, depending on the shape and arrangement of the antenna coil, even if the contact IC module is simply arranged on the non-contact IC card. Since it overlaps with the antenna coil, it may not be mounted (it is relatively common in the case of an antenna coil for anti-collision measures). This will be described with reference to FIG. FIG. 4 is a schematic plan view showing a state in which a contact type module is to be mounted on a conventional non-contact type IC card simply by following JISX6303. In the figure, in order to ensure the anti-collision performance, two opposite sides of the four sides constituting the antenna coil 31 are configured by a substantially arc-shaped curve, and the remaining two sides are configured by straight lines. The IC card 30 formed by winding a conducting wire 32 is shown. In this case, since the antenna coil 31 is formed at the mounting position of the contact IC module 3, there is a problem that the contact IC module 3 cannot be mounted.

  Therefore, the present invention maintains the antenna performance (for example, the electromotive force performance or the anti-collision performance) when the information recording medium using the IC chip is merely a non-contact type as it is (or substantially as it is), and the contact performance is maintained. An object of the present invention is to provide an information recording medium in which a contact IC chip and its external terminal can be mounted in one medium in addition to the non-contact IC chip so as to have a function as a formula.

According to a first aspect of the present invention, there is provided an antenna coil that is an antenna formed in a coil shape on a support, and a non-contact IC chip that performs non-contact communication between the antenna coil and an external device. An information recording medium comprising: an external terminal having a terminal surface on the outer surface of the support; and a contact IC chip that performs contact communication with an external device in combination with the external terminal; Is formed in a shape in which the corners of each other do not overlap when the information recording media are arranged opposite to each other, and an outer peripheral side detour portion that detours the external terminal and the contact IC chip to the outer peripheral side, and the contact type Ri among the greens to form a circumferential side detour to detour to the inner peripheral side of the IC chip, the antenna coil, the number of turns of the coils forming the outer peripheral side detour, coils forming the inner circumference side detour Winding of DOO is a substantially equal, be superimposed, characterized in that the anti-collision characteristics are maintained.

According to the present invention, the antenna coil is formed in an asymmetric shape so that the corners of each of the information recording media do not overlap when the information recording media are opposed to each other. Thus, it is possible to prevent the received electromagnetic waves from interfering with each other and to ensure good anti-collision performance. In addition, the antenna coil bypasses the contact IC chip to the outer peripheral side at the outer peripheral side bypass portion, and bypasses the contact IC chip to the inner peripheral side at the inner peripheral side bypass portion. However, the contact IC chip does not become an obstacle to the contact IC chip, and the contact IC chip can be mounted at a specified position.
And since the area of the entire region partitioned by the respective windings of the conductors constituting the antenna coil can be set in the same manner as in the case where the inner circumferential side detour portion and the outer circumferential side detour portion are not formed, It is possible to set the number of magnetic fluxes that pass through the entire region in the same manner as in the case where the detour portion is not formed. As a result, compared to the case of a medium having a simple non-contact type equipment using an IC, it is possible to secure the power necessary for communication as it is (or almost as it is), and the contact type equipment (function) can be secured. Even if provided, the performance of the non-contact antenna can be satisfactorily exhibited as it is (or substantially as it is).

Further, the area of the region defined by each winding of the conductor having the bypass portion on the outer peripheral side of the antenna coil is increased as compared with the case where the bypass portion is not formed (compared with the same number of turns). Since the area of the region partitioned by the respective windings of the conductor having the side bypass portion is reduced (compared with the same number of turns) compared with the case where the bypass portion is not formed, the increase can be offset, so By setting the number of turns of each coil on the circumferential side to be substantially the same, the area of the area defined by the entire antenna coil can be set in the same manner as in the case where the bypass portion is not formed.
Thereby, even if it has contact-type equipment (function), the performance of a non-contact-type antenna can be exhibited well as it is (or substantially as it is).

According to a second aspect of the present invention, there is provided an antenna coil that is an antenna formed in a coil shape on a support, and a non-contact IC chip that performs non-contact communication between the antenna coil and an external device. An information recording medium comprising: an external terminal having a terminal surface on an outer surface of the support; and a contact IC chip that performs contact communication with an external device in combination with the external terminal; Is formed in a shape in which the corners of each other do not overlap when the information recording media are arranged opposite to each other, and an outer peripheral side detour portion that detours the external terminal and the contact IC chip to the outer peripheral side, and the contact type The antenna coil is formed of an inner periphery-side detour portion that detours the IC chip toward the inner periphery side, and the antenna coil has a number of turns of the coil that forms the outer periphery-side detour portion of the coil that forms the inner periphery-side detour portion. Greater than the number, and the difference be two or less, wherein the anti-collision properties be superimposed is maintained.
According to this invention, the area of the region partitioned by the entire antenna coil can be made slightly larger than when the detour portion is formed. According to this, even if the magnetic flux passing through the antenna coil is not uniform (as an example of the cause, the structure or arrangement position of a reader / writer that applies a radio wave or a magnetic field to the antenna coil is expected), Even if the mere area offset of the section is not sufficient, the electromotive force generated in the antenna coil can be secured above a certain level.
As a result, compared with the case of a medium with simple contactless equipment using IC, it is possible to secure the power necessary for communication as it is (or almost as it is), and the contact equipment (function) Even if provided, the performance of the non-contact antenna can be satisfactorily exhibited as it is (or substantially as it is).

  According to the first aspect of the present invention, the anti-collision performance can be reproduced as it is (or substantially as it is) as compared with the case of a medium having a simple non-contact type equipment using an IC, and specified. The contact type IC chip and the external terminal can be mounted at a position desired by design or by the design, and the non-contact type IC chip has sufficient power necessary for communication with the external terminal. It can be reproduced as it is (or substantially as it is) as compared with the case where it exists, and the performance of the antenna in the case of a simple non-contact type can be maintained well.

According to the second aspect of the present invention, even when a contact type IC chip or an external terminal is mounted, particularly in a nearly ideal situation where the magnetic flux passing through the antenna coil is uniform, The antenna performance can be maintained satisfactorily.
According to the third aspect of the invention, the performance of the antenna in the case of a mere non-contact type even when a contact IC chip or an external terminal is mounted, particularly in a situation where the magnetic flux passing through the antenna coil is not uniform. It can be maintained well.

Hereinafter, an information recording medium according to an embodiment of the present invention will be described with reference to the drawings. In this embodiment, a case where an IC card is used as an information recording medium will be described.
FIG. 1 is a schematic plan view of an IC card to which the present invention is applied. The IC card 1 includes a card base 2, an antenna coil 5 formed in a loop shape, a non-contact type IC chip 4 that is electrically connected to the antenna coil 5 and capable of non-contact communication, and the card base. And a contact IC module 3 mounted on the material 2.
The non-contact IC module referred to in the present invention is a combination of a non-contact IC chip and an antenna. A contact IC module is a combination of a contact IC chip and an external terminal. A current IC card is provided with a contact IC chip on one side and an external terminal on the other side of the board. Some compact ones are mainstream.
The IC referred to in the present invention is not limited to a simple IC, but also includes an LSI and the like, and is a generic name for a device that is manufactured by so-called integrated circuit technology and includes a cpu and an appropriate memory.

The card substrate 2 is formed in a substantially plate shape having a rectangular cross section and is made of an insulating material such as plastic. The contact IC module 3 and the non-contact IC chip 4 include a CPU, a ROM, a RAM, a memory, and the like that perform various calculations. The contact IC module 3 includes a contact IC terminal (not shown) that directly contacts an external device. The contact IC module 3 is mounted at a position defined by JISX6303.
On the other hand, the non-contact type IC chip 4 includes a non-contact type antenna coil 5 that receives and transmits radio waves of a constant frequency with an external device. This will be described below.

  The antenna coil 5 is formed in an asymmetric shape so that the corners thereof do not overlap when the IC cards 1 and 1 are arranged to face each other. And the outer periphery side detour part 8 which detours the said contact type IC module 3 to the outer peripheral side, and the inner periphery side detour part 7 which detours the said contact type IC module 3 to an inner periphery side are formed.

  The number of turns of the antenna coil 5 is 6 turns, and the number of turns of the conducting wire 6 forming the outer circumference side bypass portion 8 is set to be larger than the number of turns of the conducting wire 6 forming the inner circumference side bypass portion 7. ing. A method of winding the antenna coil 5 will be described with reference to FIGS.

  FIG. 2 is a schematic plan view of an IC card in which a coil that forms an inner circumferential detour is extracted from the antenna coil of FIG. In the same figure, among the antenna coil 5 formed in 6 turns, the conductors 6-1 and 6-2 of the first turn and the second turn are shown. These conducting wires 6-1 and 6-2 are wound so as to surround the non-contact type IC chip 4. And by these conducting wire 6-1, 6-2, the inner periphery side detour part 7 which detours the said contact type IC module 3 to an inner periphery side is formed. Thus, by detouring the contact type IC module 3 to the inner peripheral side, the area of the region defined by these conducting wires 6-1 and 6-2 is reduced as compared with the case of not detouring.

  FIG. 3 is a schematic plan view of the IC card in which the coil forming the outer circumferential detour is extracted from the antenna coil of FIG. In the same figure, among the antenna coil 5 formed by 6 turns, the conducting wires 6 (6-3 to 6-6) of the third turn to the sixth turn are shown. These conducting wires 6-3 to 6-6 are wound so as to surround the non-contact type IC chip 4. And the outer periphery side detouring part 8 which detours the said contact type IC module 3 to an outer peripheral side is formed by these conducting wires 6-3 to 6-6. Thus, by detouring the contact type IC module 3 to the outer peripheral side, the area of the region defined by these conducting wires 6-3 to 6-6 increases as compared to the case where no detour is performed.

  As described with reference to FIG. 2 and FIG. 3, in the present embodiment, the number (4) of the conductive wires 6 forming the outer peripheral bypass portion 8 is set to the number of the conductive wires 6 forming the inner peripheral bypass portion 7. It is set more than the number (2). Therefore, the area of the region partitioned by the entire antenna coil 5 is slightly increased as compared with the case where the above-described detour portions 7 and 8 are not formed.

  A capacitor (not shown) is formed in a region partitioned in the antenna coil 5. The antenna coil 5 and the capacitor constitute a resonance circuit. An electromagnetic wave radiated from a reader / writer (not shown) is received, the received electromagnetic wave is converted into an electric signal, and then supplied to the non-contact type IC module 4. Terminals 11 and 12 are formed at the end of the antenna coil 5. The terminals 11 and 12 are electrically connected to the non-contact type IC module 3 via jumper wires (not shown).

  As described above, the antenna coil 5 is formed in an asymmetric shape so that the corners of the IC cards 1 and 1 do not overlap when the IC cards 1 and 1 are arranged to face each other. The electromagnetic waves received by the antenna coil 5 can be prevented from interfering with each other, and the anti-collision performance can be ensured satisfactorily.

  Further, the antenna coil 5 bypasses the contact IC module 3 to the outer peripheral side at the outer peripheral side bypass portion 8, and bypasses the contact IC module 3 to the inner peripheral side at the inner peripheral side bypass portion 7. Therefore, the antenna coil 5 does not interfere with the contact IC module 3, and the contact IC module 3 can be mounted at a specified position.

  Further, since the area of the region partitioned by the entire antenna coil 5 can be made slightly larger than the case where the bypass portions 7 and 8 are formed, the position of the reader / writer that transmits electromagnetic waves to the antenna coil 5 can be increased. Even when the magnetic flux passing through the antenna coil 5 is bent and weakened, the electromotive force generated in the antenna coil 5 can be secured to a certain level or more. Therefore, without significantly changing the characteristics of the non-contact type IC chip 4, it has a function that sufficiently satisfies the communication distance characteristics and can improve the performance.

  Further, by forming the detours 7 and 8 as described above, the asymmetry of the antenna coil 5 is maintained even when the IC cards 1 and 1 are overlapped with each other and when they are rotated 180 degrees from that state. Therefore, further stabilization of communication can be achieved.

Of course, the contents of the present invention are not limited to the above-described embodiments. For example, the number of windings of the conductive wire forming the antenna coil is not limited to the above six times, and can be arbitrarily set.
In the embodiment, the number of turns of the conducting wire 6 forming the outer periphery-side bypass portion 8 is set to be larger than the number of turns of the conducting wire 6 forming the inner periphery-side bypass portion 7. It is also possible to set the same. In this case, the area of the region defined by the conductive wires 6 that form the outer periphery side bypass portion 8 increases as compared to the case where the bypass portion 8 is not formed, but the inner periphery side bypass portion 7 is formed. The area of the region defined by each winding 6 can be reduced compared to the case where the bypass portion 7 is not formed, and the increase can be canceled out.

  Therefore, by setting the numbers of turns of the respective conductors 6 to be substantially the same, the area of the region defined by the entire antenna coil 5 can be set in the same manner as when the detour portions 7 and 8 are not formed. Therefore, by minimizing the fluctuation of the area of the magnetic field received by the antenna coil 5, the reader / writer can perform stable communication with the plurality of cards 1 and 1, and is a non-contact type information process corresponding to anti-collision. Can have functions. Thereby, it is possible to realize the IC card 1 having a contact-type information processing function while maintaining the performance of the non-contact type IC chip.

  Moreover, although the case where an IC card is used as the information recording medium of the present invention, a contact IC module is used as a contact IC chip, and a non-contact IC chip is used as a non-contact IC chip, the present invention is not limited thereto. The present invention can also be applied to other information recording media.

It is a schematic plan view of the state of the chip | tip and antenna of an IC card in embodiment of this invention. FIG. 2 is a schematic plan view of a state of an IC card chip and an antenna shown by extracting a conducting wire that forms an inner circumferential detour from the antenna coil of FIG. 1. FIG. 2 is a schematic plan view of a state of an IC card chip and an antenna shown by extracting a conducting wire that forms an outer circumferential detour portion from the antenna coil of FIG. 1. It is a schematic top view which shows the mode of the chip | tip and antenna of the state which was going to mount a contact type IC module in the conventional non-contact type IC card simply.

Explanation of symbols

1 ... IC card (information recording medium)
2 ... Card base 3 ... Contact IC module 4 ... Non-contact IC chip 5 ... Antenna coil 6 ... Conductor 7 ... Inner circumference detour section 8 ... Outer circumference detour section

Claims (2)

On the support,
An antenna coil which is an antenna formed in a coil shape;
A non-contact IC chip that performs non-contact communication with an external device in combination with the antenna coil;
An external terminal having a terminal surface on the outer surface of the support;
In an information recording medium comprising a contact IC chip that performs contact communication with an external device in combination with the external terminal,
The antenna coil is formed in a shape in which the corners of each other do not overlap when the information recording media are arranged to face each other, and an outer periphery side detour portion that detours the external terminal and the contact IC chip to the outer periphery side, Ri Na to form an inner peripheral side detour to bypass the contact IC chip on the inner peripheral side,
The antenna coil includes the number of turns of the coil forming the outer peripheral side detour portion, and the inner peripheral side detour portion.
An information recording medium characterized in that the number of turns of the coil forming the section is substantially the same . On the support,
  An antenna coil which is an antenna formed in a coil shape;
  A non-contact IC chip that performs non-contact communication with an external device in combination with the antenna coil;
  An external terminal having a terminal surface on the outer surface of the support;
  In an information recording medium comprising a contact IC chip that performs contact communication with an external device in combination with the external terminal,
  The antenna coil is formed in a shape in which the corners of each other do not overlap when the information recording media are opposed to each other, and an outer periphery side detour portion that detours the external terminal and the contact IC chip to the outer periphery side, Forming an inner periphery-side detour portion that detours the contact IC chip toward the inner periphery,
  In the antenna coil, the number of turns of the coil that forms the outer periphery-side bypass portion is the inner periphery-side bypass.
An information recording medium characterized in that the number is greater than the number of turns of the coil forming the section, and the difference is 2 or less.

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