JP2006314556A - Shield sheet, storage case, storage method and reader-writer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique which enables the use of a plurality of noncontact information recording media in piles by using a shield sheet which combines a magnetic line attenuation plate and a magnetic line shield section as a storage case for noncontact information recording media. <P>SOLUTION: The shield sheet 12 comprises: a shielding material (magnetic line attenuation plate) 13 consisting of perfect conductor or diamagnetic substance, such as copper or aluminum; and ferrite materials (magnetic line shield section) 11, 14 which are attached respectively to the front and the rear of the shield material 13 and consist of magnetic material of ferrite core or the like, wherein the ferrite materials 11, 14 are at least arranged without any overlapping part. In the embodiment, the ferrite materials 11, 14 are attached to approximately half of the shielding material 13, and they are kept from overlapping. That is, the shield material 13b is in the rear face opposite to the position of the ferrite material 11 and the shield material 13a is in the rear face opposite to the position of the ferrite material 14. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shield sheet, a storage case, a storage method, and a reader / writer, and more specifically, accurately reads and writes each recording medium in a state where a plurality of non-contact information recording media such as IC cards are stacked. It is about the technology that makes it possible.

In recent years, contactless information recording media called IC cards have been widely available on the market. The IC card is a generic name for cards having a card-like or sheet-like shape such as a credit card, a bank card, and a point card, in which an IC chip is incorporated in the card. Recently, with the widespread use of IC card-compatible automatic ticket gates, some users are increasingly holding a plurality of IC cards in a regular case or pass case. For example, as an example of using an automatic ticket gate that supports IC cards, if you use Suica in the Kanto area and ICOCA in the Kansai area, you will need to insert your IC card regularly each time you pass through each automatic ticket gate. And I had to take it out of the pass case. If the two IC cards are mistakenly used in a stacked state, a reading error (or processing error) occurs.
In order to solve these problems, Patent Document 1 discloses a first and second configuration in which a magnetic field line shielding portion made of a soft magnetic material is provided on one side of a card pocket portion into which a non-contact IC card is inserted, or a non-contact IC card is inserted. The two card pocket portions are disposed on both sides of the magnetic field shielding portion made of a soft magnetic material, and a perfect conductor or a diamagnetic material is provided outside one of the first and second card pocket portions. A technique for determining which non-contact IC card to communicate with by the surface to which the pocket is directed is provided by providing the magnetic field line attenuating portion.
In Patent Document 2, two non-contact information recording media can be stored in a stacked manner, and when the storage medium is held over the antenna of the non-contact information recording medium processing machine, the non-contact type information recording medium is stored. A storage unit made of a material capable of exchanging data with an information recording medium processor, and the non-contact type recording medium provided in the storage unit and between the non-contact information recording medium in a stacked form. It consists of a shielding plate made of a material that prevents data exchange with the information recording medium processing machine, and selectively communicates with a non-contact information recording medium that requires communication between two non-contact information recording media. The technology is disclosed.
Japanese Patent Laid-Open No. 10-201517 JP 2001-76104 A

However, in the conventional technique disclosed in Patent Document 1, it is necessary to provide a magnetic force line shielding portion on the entire surface of the IC card. In general, the magnetic field shielding portion uses a costly member such as ferrite, and thus there is a problem that the unit price of the component becomes high.
In addition, the prior art disclosed in Patent Document 2 has a problem that the unit price is high because a shielding portion formed of a ferrite core needs to be provided on the entire surface of the IC card as in Patent Document 1. Moreover, although it is disclosed that the material of the shielding part is made of metal, in this case, there is a possibility that inconvenience may occur due to the attenuation of the lines of magnetic force caused by the metal.
In view of such problems, the present invention uses a plurality of non-contact information recording media in a stacked manner by using a shield sheet in which a magnetic line attenuation plate and a magnetic force shield are combined in a storage case for a non-contact information recording medium. The purpose is to provide a technology that can do this.

In order to solve the above problems, the present invention provides a magnetic field attenuation plate made of a complete conductor or a diamagnetic material, and a magnetic force line shielding portion made of a magnetic material respectively attached to the front and back surfaces of the magnetic field attenuation plate. And each of the magnetic field line shielding portions is arranged so that at least a part thereof does not overlap.
The magnetic field attenuation plate has a function of blocking electromagnetic induction, and refers to a complete conductor such as a copper plate or aluminum or a diamagnetic material. The magnetic force line shielding portion refers to a magnetic material such as a ferrite core that is a material that does not attenuate the magnetic force lines. In the present invention, the magnetic field line shielding portions are disposed on the front and back surfaces of the magnetic field line attenuation plate so that at least a part thereof does not overlap.
According to a second aspect of the present invention, magnetic field line shielding part recesses are provided on the front and back surfaces of the magnetic field line attenuation plate, and the magnetic field line shielding parts are fitted in the magnetic field line shielding part recesses.
When a thick magnetic field shielding portion is attached to the front and back of a flat magnetic field attenuation plate, the entire thickness increases and irregularities occur on the surface. Therefore, in the present invention, the overall thickness is reduced and the surface is flattened by providing the magnetic field attenuation plate with a recess that can accommodate the magnetic field shielding portion.
According to a third aspect of the present invention, the magnetic field attenuation plate is made of copper or aluminum.
When the magnetic field lines pass through the conductor, the energy is attenuated as Joule heat. As a result, the magnetic field lines are attenuated. Accordingly, copper or aluminum, which is a diamagnetic material, is preferable as the material of the magnetic field attenuation plate.
According to a fourth aspect of the present invention, the magnetic field line shielding portion is formed of a ferrite core.
The magnetic field lines hardly attenuate when passing through the magnetic material. Applying this principle, the magnetic flux density is small, but it is optimal to use a ferrite core having a large coercive force as a magnetic field shielding part. Thereby, the magnetic field lines are shielded by the ferrite core.

Claim 5 is a storage case for storing two non-contact information recording media in an overlapping manner, wherein the shield sheet according to any one of claims 1 to 4 and the non-contact information recording medium are stored. And two storage portions each storing one by one, wherein the two storage portions are separated by the shield sheet.
When storing two non-contact type information recording media in a storage case, the shield sheet of the present invention is interposed between the two non-contact type information recording media, and the magnetic field lines radiated from one of the non-contact type information recording media are not on one side. It is configured to reach only the contact information recording medium.
According to a sixth aspect of the present invention, when the two non-contact type information recording media are individually stored in the storage unit, an IC chip mounting portion for controlling each non-contact type information recording medium is attached to the shield sheet. Each of the non-contact type information recording media is stored so as to face the magnetic field attenuation plate.
The shielding effect on the non-contact type information recording medium by the shield sheet is the highest when the shield area of the non-contact type information recording medium is constant, and when the shield sheet is applied around the chip mounting portion of the non-contact type information recording medium. It became clear by experiment. In other words, it can be said that the shielding effect is reduced when there are magnetic field shielding portions on both surfaces of the magnetic field attenuation plate in the place corresponding to the chip mounting portion of the non-contact type information recording medium.
According to a seventh aspect of the present invention, when reading / writing information with respect to the two non-contact information recording media stored by the storage method according to the sixth aspect by a reader / writer, one of the two non-contact information recording media is selected. Information is read from and written to the surface by bringing the surface close to the antenna unit of the reader / writer.
When two non-contact information recording media are stored in the storage case of the present invention by the storage method of the present invention, the non-contact information recording medium to be operated needs to be close to the antenna portion. Thereby, the non-contact type information recording medium and the reader / writer that are close to the antenna unit communicate with each other, and the non-contact type information recording medium stored on the opposite side does not communicate.

According to the first aspect of the present invention, since the magnetic field line shielding portions are arranged on the front and back sides of the magnetic field attenuation plate so that at least a part thereof does not face each other, a shield sheet with fewer components and an enhanced magnetic field line shielding effect is realized. can do.
According to the second aspect of the present invention, since the concave portion for accommodating the magnetic force line shielding portion is provided in the magnetic force line attenuation plate, the thickness of the entire shield sheet can be reduced and the surface can be flattened.
According to the third aspect of the present invention, since the magnetic field attenuation plate is made of copper or aluminum which is a diamagnetic material, it is relatively inexpensive and can enhance the effect of attenuation of the magnetic field lines.
In claim 4, since the ferrite core having a small magnetic flux density but a large coercive force is used as the magnetic field line shielding part, the magnetic field line shielding effect can be enhanced and the effect can be maintained for a long time.
According to the fifth aspect of the present invention, since the shield sheet of the present invention is interposed between the two non-contact type information recording media, even if the two non-contact type information recording media are stacked and stored in the same storage case, a reading error occurs. Can be eliminated.
According to the sixth aspect of the present invention, since each non-contact type information recording medium is accommodated so that the IC chip mounting portion does not overlap with the magnetic force line shielding portion attached to the shield sheet, the shielding effect on each non-contact type information recording medium is achieved. It can be further increased.
Further, in claim 7, when two non-contact type information recording media are stored in the storage case of the present invention by the storage method of the present invention, the non-contact type information recording medium to be operated is close to the antenna portion. Obviously, it is possible to prevent the wrong orientation of the non-contact type information recording medium to be used.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention only unless otherwise specified. .
FIG. 1 is a block diagram showing a configuration of a general IC card reader / writer. This IC card reader / writer (hereinafter simply referred to as a reader / writer) 100 is controlled by a PC 50 that exchanges data with the reader / writer 100 and controls the entire system. The reader / writer 100 includes a transmission / reception device 1 that controls a data communication protocol with an external PC 50, a control device 2 that controls the operation of the entire reader / writer 100, firmware that records a procedure for operating the control device 2, and read data A memory device 3 for storing data, a modulator 4 for modulating data from the control device 2 on a carrier wave, an input device 5 for inputting an operation command, and a display device 6 for displaying information controlled by the control device 2 A power amplifier 7 that amplifies the power supply signal that is an AC signal from the control device 2 and a write command from the modulator 4, and a detector demodulator that converts the carrier wave received from the loop antenna 9 into binary data 8 and a loop antenna 9 for exchanging power and data with an IC card (RF tag) (not shown). .
FIG. 2 is a block diagram showing the configuration of the IC card. The IC card 200 according to the present embodiment receives an antenna 20 that transmits / receives data using a power carrier wave from the reader / writer 100, a transmission / reception circuit 21 that generates a write command read command, and a power carrier wave from the antenna 20. Power generation circuit 22 that rectifies and converts it into DC power, a memory device 23 that manages storage of control firmware and data, a modulator 24 that modulates a transmission command from the control circuit 26 with a carrier wave, and a transmission / reception circuit 21 includes a detector 25 for converting the carrier wave data from 21 into binary data, and a control circuit 26 for controlling the overall operation of the IC card 200.

Next, each operation will be described with reference to FIGS. 1 and 2 together. When a power supply (not shown) is turned on, the reader / writer 100 starts an operation according to a program stored in the memory device 3 after the initial operation of the control device 2. First, initialization is performed. Next, the control device 2 alternately transmits a power supply signal supplied to the IC card 200 and a polling signal from the power amplifier 7. The signal is radiated to the outside from the loop antenna 9 as an electromagnetic wave. Next, when the IC card 200 comes close to the reader / writer 100, the antenna 20 receives the power supply signal, and the power generation circuit 22 rectifies the carrier wave to convert it into DC power. Supply to the circuit. When power is supplied and the control circuit 26 is driven, control is started in accordance with a program stored in the memory device 23.
Next, the control circuit 26 first demodulates the command from the transmission / reception circuit 21 by the detector 25 and converts it into a binary signal, and analyzes the command. As a result, when it is recognized that it is called, the response is modulated by the modulator 24 and transmitted from the antenna 20 via the transmission / reception circuit 21. The reader / writer 100 receives this response with the loop antenna 9, converts it into a binary code with the detector demodulator 8, analyzes it with the control circuit 2, and recognizes that the IC card 200 is an IC card conforming to the standard. . Thereby, polling is performed between the reader / writer 100 and the IC card 200 thereafter.

Fig.3 (a) is a figure which shows the structure of the shield sheet based on the 1st Embodiment of this invention. This shield sheet 12 includes a shield material (magnetic line attenuation plate) 13 made of a complete conductor or diamagnetic material such as copper or aluminum, and a ferrite material (magnetic line of force) made of a magnetic material such as a ferrite core attached to the front and back of the shield material 13. Shielding members) 11 and 14, and the ferrite materials 11 and 14 are arranged so that at least a part thereof does not overlap. In this embodiment, ferrite materials 11 and 14 are attached to substantially half of the shield material 13 so that they do not face each other. That is, the shield material 13 b is on the back surface facing the ferrite material 11, and the shield material 13 a is on the back surface facing the ferrite material 14 position.
FIG. 3B is a diagram for explaining the operation when two IC cards stored in a pass case (details will be described later) are brought close to the IC card reading unit. In this embodiment, the pass case (storage case) 15 is a pass case for storing two IC cards A 200a and IC cards B 200b in an overlapping manner, and includes the shield sheet 12 described in FIG. 3A and the IC card A 200a. And two storage portions 17 and 18 for storing each IC card B 200b one by one, and the two storage portions 17 and 18 are separated by the shield sheet 12. When this pass case is brought close to the antenna 9 of the reader / writer 100, for example, in the case of FIG. 3B, the IC card B 200b is accommodated in the accommodating portion 18 of the pass card 12, so that the magnetic field lines 16 radiated from the antenna 9 are obtained. Thus, communication with the reader / writer 100 becomes possible by the antenna 20 provided in the IC card B 200b. At this time, the magnetic force line 16 is blocked by the shield sheet 12 and the IC card A 200a cannot communicate with the reader / writer 100 (details will be described later).
FIG.3 (c) is the figure which looked at the pass case from the front. The pass case 15 has ports 17a and 18a of the storage portions 17 and 18 on the front, and is separated by the shield sheet 12 so as to separate the upper and lower sides at the boundary. In this case, the outer wall of the pass case 15 is made of a material that does not affect the lines of magnetic force (for example, a resin material).

  FIG. 4A is a diagram for explaining a shielding method for a chip mounting portion of an IC card. It has been experimentally found that the shielding effect on the IC card by the shield sheet 12 is highest when the area of the shield material 13 of the IC card is constant and when it is applied around the chip mounting portion of the IC card. In other words, if there is a ferrite material on both sides of the shield material 13b in the place corresponding to the chip mounting portion 30 of the IC card 200a, it can be said that the shielding effect is lowered. Therefore, in the present embodiment, the ferrite material 11 and the ferrite material 14 are attached to substantially half of both surfaces of the shield material 13 so that the chip mounting portion 30 of the IC card A 200a overlaps only with the ferrite material 11. A ferrite material is not attached to the overlapping shield material 13b. Similarly, in order to make the chip mounting portion 31 of the IC card B 200b overlap only with the ferrite material 14, the ferrite material is not attached to the shield material 13a overlapping the ferrite material 14. FIG. 4B is a top view when the chip mounting portion 30 of the IC card A 200 a is set on the shield sheet 12 so as to overlap the ferrite material 11. Therefore, when the IC card A 200a is stored in the pass case 15, the lower part of the chip mounting portion is shielded in any direction. That is, the shield effect is high when the chip mounting portion 30 is on the right side in FIG.

FIG. 5 is a diagram showing a configuration of a shield sheet according to the second embodiment of the present invention. The same components will be described with the same reference numerals. FIG. 5A shows the configuration of the shield sheet according to the first embodiment. Since the thick ferrite materials 11 and 14 are attached to the front and back surfaces of the flat shield material 13, the entire thickness is increased, and irregularities are formed on both surfaces. It will occur. FIG. 5B shows the configuration of the shield sheet in the present embodiment. In the shield sheet of this embodiment, the ferrite materials 11 and 14 are attached at positions where at least a part of the front and back of the shield material 13 does not overlap, and the ferrite material recesses (recesses for the magnetic field shielding portions) are respectively provided on the front and back of the ferrite materials 11 and 14. ) 11a and 14a are provided, and the ferrite materials 11 and 14 are fitted into the respective recess portions 11a and 14a for the ferrite material.
FIG. 6 is a schematic diagram for explaining the movement of magnetic lines of force when an IC card is stacked on the shield sheet of the present invention. By arranging the ferrite material 11 (14) that forms the magnetic paths of the magnetic fluxes 70 and 73 on one side of the IC card 200 as shown in FIG. 6, even if the shield material 13 exists directly under the IC card 200, the magnetic flux Since 70 and 73 cross the loop antenna (not shown) of the IC card 200 by using the ferrite material 11 (14) as a magnetic path, communication with a reader / writer (not shown) can be performed. In the drawing, the magnetic flux 74 is attenuated by the shield material 13, but the ferrite material 11 (14) becomes a magnetic flux path, and the influence of the metal can be ignored.
FIG. 7 is a schematic view for explaining the movement of magnetic lines of force by the shield sheet of the present invention based on the principle of FIG. The same components will be described with the same reference numerals. In order to simplify the description, the description will be made assuming that there are two lines of magnetic force. The magnetic force lines 40 radiated from the reader / writer antenna 9 cross the antenna (not shown) of the IC card B 200 b and reach the ferrite material 14. Since the ferrite material 14 is a magnetic material, the magnetic force lines 40 are passed in the direction of the arrow without being attenuated. Even if magnetic field lines leaking from the ferrite material 14 exist, since the shield material 13 is made of a complete conductor or a non-magnetic material, the leaked magnetic field lines are attenuated and hardly reach the IC card 200a side. Further, the other magnetic field lines 41 reach the shield material 13 directly across the antenna (not shown) of the IC card B200b. Since the shield material 13 is made of a perfect conductor or a non-magnetic material, the magnetic field lines are attenuated and pass through the ferrite material 11 in the direction of the arrow. Then, it is attenuated again by the shield material 13 and radiated as magnetic lines of force 42 from the surface thereof, but the magnetic line of force 42 is greatly attenuated by the shield material 13 and hardly affects the magnetic lines of force 40. At this time, since the ferrite material 11 is a magnetic material, the magnetic force lines 41 are allowed to pass through in the direction of the arrow without being attenuated, and therefore hardly reach the IC card 200a side.
As described above, the shielding effect on the IC card by the shield sheet 12 is found to be the highest when the area of the IC card shielding material 13 is constant and when the shield sheet 12 is applied around the chip mounting portion of the IC card. is doing. Therefore, if there is a ferrite material on both sides of the shield material 13b in the place corresponding to the chip mounting portion 30 of the IC card 200a, the shielding effect is lowered. Therefore, in the present invention, no ferrite material is installed on the shield material 13b.

As described above, according to the present invention, since the ferrite materials 11 and 14 are arranged on the front and back of the shield material 13 so that at least a part of the ferrite materials does not face each other, the shield sheet has a small number of parts and an enhanced effect of shielding the lines of magnetic force. 12 can be realized.
Further, since the recesses 11a and 14a are provided in the shield material 13 so that the ferrite materials 11 and 14 can be accommodated, the entire thickness of the shield sheet 12 can be reduced and the surface can be flattened.
Further, since the shield material 13 is made of copper or aluminum which is a diamagnetic material, it is relatively inexpensive and can enhance the effect of attenuation of magnetic field lines.
Further, since the ferrite core having a small magnetic flux density but a large coercive force is used as the magnetic force line shielding portion, the magnetic force line shielding effect can be enhanced and the effect can be maintained for a long time.
Further, since the shield sheet 12 of the present invention is interposed between the two IC cards 200a and 200b, reading errors can be eliminated even if the two IC cards 200a and 200b are stacked and stored in the same storage case. .
Moreover, since each IC card 200a, 200b is accommodated so that IC chip mounting part 30,31 may not overlap with the ferrite materials 11,14 attached to the shield sheet 12, the shielding effect to each IC card 200a, 200b is achieved. It can be further increased.
Further, when two IC cards 200a and 200b are stored in the storage case 15 of the present invention by the storage method of the present invention, the IC card to be operated is close to the antenna portion 9, so that the IC card to be used clearly is used. It is possible to prevent the wrong direction.

It is a block diagram which shows the structure of the general reader / writer for IC cards. It is a block diagram which shows the structure of an IC card. (A) is a figure which shows the structure of the shield sheet based on the 1st Embodiment of this invention, (b) demonstrates operation | movement when the two IC cards accommodated in the pass case adjoin to the IC card reading part. FIG. 4C is a view of the pass case as viewed from the front. (A) is a figure explaining the shielding method of the chip | tip mounting part of an IC card, (b) is a top view at the time of setting to the shield sheet 12 so that the chip | tip mounting part 30 of IC card A200a may overlap with the ferrite material 11. FIG. . (A) (b) is a figure which shows the structure of the shield sheet based on the 2nd Embodiment of this invention. It is a mimetic diagram explaining movement of a line of magnetic force when an IC card is piled up on a shield sheet of the present invention. It is a schematic diagram explaining the motion of the magnetic force line by the shield sheet of this invention based on the principle of FIG.

Explanation of symbols

  9 Antenna part, 11, 14 Ferrite material, 12 Shield sheet, 13 Shield material, 15 Pass card, 17, 18 storage part, 30, 31 Chip mounting part, 100 Reader / writer, 200 IC card

Claims (7)

A magnetic field line attenuation plate made of a complete conductor or a diamagnetic material, and a magnetic field line shielding portion made of a magnetic material respectively attached to the front and back surfaces of the magnetic field line attenuation plate,
The shield sheet, wherein each of the magnetic field line shielding portions is arranged so that at least a part thereof does not overlap.   2. The shield sheet according to claim 1, wherein a concave portion for a magnetic force line shielding portion is provided on each of the front and back surfaces of the magnetic force line attenuation plate, and the magnetic force line shielding portion is fitted in the concave portion for each magnetic force line shield portion.   The shield sheet according to claim 1 or 2, wherein the magnetic field attenuation plate is made of copper or aluminum.   The shield sheet according to claim 1, wherein the magnetic field line shielding portion is formed of a ferrite core. 5. A storage case for storing two non-contact type information recording media in a stacked manner, wherein the shield sheet according to claim 1 and the non-contact type information recording medium are stored one by one. Two storage units that perform,
The storage case, wherein the two storage portions are separated by the shield sheet.   When the two non-contact type information recording media are individually stored in the storage unit, an IC chip mounting portion that controls each non-contact type information recording medium is attached to the shield sheet. A storage method comprising storing each of the non-contact information recording media so as to face each other.   7. When reading / writing information from / to two non-contact information recording media stored by the storage method according to claim 6, one surface of the two non-contact information recording media is placed on the reader / writer. A reader / writer characterized in that reading and writing of information on the surface is performed by being close to the antenna portion of the device.

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