JP2001250093A - Compound data carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compound data carrier by collecting plural data carriers by solving such a problem that tuning characteristics are deviated by mutual coupling between coils between respective data carriers. SOLUTION: One compound data carrier is constituted by integrally collecting plural data carriers by inserting a common plate-shaped magnetic core to an air-core coil for receiving an alternating magnetic field supplied from a reader/ writer and even when plural data carriers are tightly located, the mutual interference of data carriers caused by an induced current can be decreased as little as possible. Thus, the compound data carrier provided with required and desired memory capacity can be constituted without extremely reducing the communication distance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite data carrier, and more particularly to a reader / writer device which supplies an alternating magnetic field to a service area, modulates an alternating magnetic field transmitted from the reader / writer device, and issues commands and data. The data carrier is suitable for use in a data carrier system in which a built-in coil receives an alternating magnetic field supplied from the reader / writer device, rectifies an induced electromotive force, and uses the rectified electromotive force as an operation power supply. Complex data carrier.

[0002]

2. Description of the Related Art A data carrier system comprising a data carrier (child device) in which an IC chip is arranged on a plastic card and a reader / writer device (parent) for supplying an alternating magnetic field to the data carrier wirelessly. Is becoming popular.

In such a data carrier system, since the amount of data held in the data carrier is not so large in most cases, the capacity of a memory provided on a general-purpose data carrier is generally
It is usually not big.

[0004] However, in the application field of the data carrier, there are cases where it is desired to have a large amount of data. In such a case, a data carrier having a memory capacity commensurate with the amount of data to be held may be selected.

[0005] However, it is often difficult to obtain a data carrier having a desired memory capacity. In other words, if you want to have a large amount of data in a data carrier, you can develop a data carrier with a larger non-volatile memory size, but in general, applications of data carriers that hold large amounts of data are limited to special applications. Therefore, even if a user develops a desired data carrier using a large amount of development cost, it is almost impossible to make a profit.

[0006] In addition, dedicated ICs for data carriers having an external memory extension function are limited, and there is a problem that it is difficult to select a product type suitable for the purpose. For this reason, conventionally, a required memory capacity has been secured by collectively using a plurality of data carriers.

[0007]

When a plurality of data carriers are integrated, mutual coupling occurs between coils of a tuning circuit composed of a coil and a capacitor provided in each data carrier. There is a problem that the tuning characteristics in the above are shifted. In particular, when a tuning circuit in each data carrier has a high Q to enable a long communication distance, there is a problem that the communication distance is significantly deteriorated when a plurality of data carriers are used together.

The present invention has been made in view of the above-mentioned problems, and has been made to solve the problem of a shift in tuning characteristics due to mutual coupling between coils between data carriers, and to enable a plurality of data carriers to be used collectively. Aim.

[0009]

A composite data carrier according to the present invention has an antenna device for inducing a current by receiving an alternating magnetic field supplied from a reader / writer device. What is claimed is: 1. A composite data carrier comprising a plurality of data carriers which rectify electric power and are used as an operation power supply, wherein said air core coil is disposed on each data carrier to receive an alternating magnetic field sent from said reader / writer device. A plurality of data carriers are integrally formed by inserting a plate-shaped magnetic core in common. Another feature of the present invention is that the antenna device has an antenna device for receiving an alternating magnetic field supplied from a reader / writer device to induce a current, and rectifies an electromotive force induced by the antenna device. A composite data carrier comprising a plurality of data carriers used for an operation power supply, wherein an air-core coil disposed on each data carrier for receiving an alternating magnetic field sent from the reader / writer device includes a plurality of data carriers. The present invention is characterized in that the plurality of data carriers are integrally formed by being commonly used in a carrier module. Another feature of the present invention is that the antenna device has an antenna device for receiving an alternating magnetic field supplied from a reader / writer device to induce a current, and rectifies an electromotive force induced by the antenna device. A composite data carrier comprising a plurality of data carriers used for an operating power supply, wherein the antenna device for receiving the alternating magnetic field comprises an air-core coil, and a plate-shaped magnetic core inserted through the air-core coil. When a plurality of data carriers constituted by the above are arranged together, the antenna device is arranged so that the directions of the antenna devices are alternately changed so as to be on the front side and the back side. Another feature of the present invention is that the antenna device has an antenna device for receiving an alternating magnetic field supplied from a reader / writer device to induce a current, and rectifies an electromotive force induced by the antenna device. A composite data carrier comprising a plurality of data carriers used as operating power supplies, wherein an antenna device disposed on each data carrier for receiving the alternating magnetic field is provided with an air-core coil wound in a plane. And a plate-shaped magnetic core inserted into the air-core coil so as to be substantially parallel to the plane of the air-core coil, and a metal foil is provided on at least one surface of the air-core coil. It is characterized by comprising a plurality of data carriers. Another feature of the present invention is that the metal foil is disposed so as to substantially shield the entire air-core coil when viewed from a plane direction. Another feature of the present invention is that the plate-shaped magnetic core is made of either amorphous metal or permalloy.
Another feature of the present invention is that the plate-shaped magnetic core is a unidirectional silicon steel plate, and the goss direction of the plate-shaped magnetic core is oriented in the axial direction of the air-core coil. It is characterized by being arranged in.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a composite data carrier according to the present invention will be described with reference to the accompanying drawings. FIG.
2 and FIG. 2 show a schematic configuration of a composite data carrier according to the first embodiment of the present invention. As shown in FIG. 1, the composite data carrier of the present embodiment shows an example in which to use together integrally four data carrier ID ₁ ~ID _4. That is, four data carrier IDs ₁ to
Each air core coil 10 of ID ₄ is passed through one magnetic core 11. In this case, each data carrier ID ₁ ~ID ₄ is no need to process anything.

Each of the data carriers ID _{1 to} ID ₄ comprises an air-core coil 10 and a data carrier module 12, on which an IC chip 13 and a tuning capacitor 14 are arranged.

The air-core coil 10 as described above is easy to manufacture and easily available, and an air-core coil of any shape and size can be selected according to design requirements. Since the configuration can be achieved simply by inserting the plate-shaped magnetic core 11 into the general-purpose air-core coil 10, the basic configuration of the composite data carrier of the present embodiment is easy to manufacture, and the manufacturing cost can be reduced. it can. The plate-shaped magnetic core 11 can be formed by cutting, for example, an amorphous sheet into a predetermined size and winding an insulating sheet around it.

In the composite data carrier of the present embodiment configured as described above, since the core 11 is commonly used, each data carrier is arranged in spite of a plurality of data carriers being arranged close to each other. in ID ₁ ~ID _4, it can be kept free mutual interference by induced current.

When a memory (not shown) of the IC chip 13 provided in each data carrier module 12 is used, even if it is configured separately as in the present embodiment, it is integrally configured. it is possible to use as well as have a memory, it is possible to achieve the same ease of use and complex data carrier having a memory capacity which is the sum of the capacity of each memory of the data carrier ID ₁ ~ID _4.

Next, a second embodiment of the composite data carrier of the present invention will be described with reference to FIG. In the case of this example, the magnetic core 31 and the air core coil 32 are connected one to one,
Four data carrier IDs for the air core coil 32
_{1 to} ID ₄ are connected.

In the case of the present embodiment configured as described above,
Despite being disposed a plurality of data carriers ID ₁ ~ID _4, the coil for inducing electric power from the reader / writer device is one, so that interference between the coils does not occur in the data carrier can be, despite the arranged close to a plurality of data carriers ID ₁ ~ID _4, to prevent interference by the induced current can be secured without the required memory capacity problem.

Next, a third embodiment of the present invention will be described with reference to FIGS. This example shows an example in which _four data carriers ID _{1 to} ID ₄ are collectively stored in the case 40.

A plurality of data carriers are arranged in close contact with each other.
If you want to set, each data carrier ID ₁~ ID_FourThe relationship between
Entities are roughly divided as shown in FIG. 5 (A) or FIG. 5 (B).
You. That is, in FIG.
Although the direction of a is reversed in order, in FIG.
, Each data carrier is placed in the same orientation.

When a large number of data carriers ID _{1 to} ID ₄ are arranged, the reader / writer device supplies a strong alternating magnetic field so that these data carriers ID _{1 to} ID ₄ can be driven simultaneously and sufficiently. There is a need. However, even when an intense alternating magnetic field is supplied, if many data carriers are in close contact, a composite data carrier that cannot operate may be generated.

This is because each of the data carriers ID _{1 to} ID ₄ receives an alternating magnetic field from the reader / writer device.
This is because an induced current flows through the antenna coil incorporated in the data carrier, and a magnetic field newly generated by the induced current adversely affects the operation of the data carrier.

That is, as shown in FIG. 5A, if the directions of a large number of data carriers are reversed in order, the magnetic field newly generated by the induced current flowing through the antenna coil induces the antenna of the adjacent data carrier. There is no problem because it does not act to cancel the current (operating voltage) that is applied.

However, as shown in FIG. 5B, if the antenna coils of many data carriers have the same direction, the magnetic field newly generated by the induced current flowing through each antenna coil causes the antennas of the adjacent data carriers to have the same direction. In this case, the current (operating voltage) induced in the data carrier acts so as to cancel out the current carrier, so that the data carrier near the center cannot obtain the required operating power and cannot operate.

As described above, it is possible to solve the problem of arranging as shown in FIG. 5 (B) and to provide a composite data which can secure a required memory capacity by integrally arranging a plurality of data carriers. The structure of the carrier is shown below.

That is, in FIG. 6, a plate-shaped magnetic core 11 is inserted into an air-core coil 10 wound in a planar shape so as to be substantially parallel to the plane of the air-core coil 10, and individual data carriers are formed. Are configured.

An IC chip 13, a tuning capacitor 14, and the like are incorporated in a data carrier module 12 that operates by being supplied with operating power from an antenna device including the air core coil 10 and the magnetic core 11. Then, insulating sheets 15 and 16 are provided so as to sandwich the antenna device and the data carrier module 12 from both sides, and metal foils 17 and 18 are attached to both outer sides thereof. As the material of the metal foils 17 and 18, an aluminum foil or a copper foil can be used.

The air-core coil 10 as described above is simple to manufacture and easily available, and an air-core coil having an arbitrary shape and size can be selected according to design requirements. Then, the antenna device can be configured only by inserting the plate-shaped magnetic core 11 into the general-purpose air-core coil 10,
The basic configuration of the composite data carrier of the present embodiment is easy to manufacture and can reduce the manufacturing cost. The plate-shaped magnetic core 11 can be formed by cutting, for example, an amorphous sheet into a predetermined size and winding an insulating sheet around it. Moreover, it can also be comprised using permalloy.

As described above, when the data carriers without the metal foils 17 and 18 are arranged in the same direction, the electromotive voltage of the data carrier near the center decreases. However, in the case of the present embodiment, since the metal foils 17 and 18 are provided, a stable operating voltage can be obtained even if a plurality of data carriers are arranged in the same direction. In particular, a great effect can be obtained for applying a magnetic field from the longitudinal direction of the plate-shaped magnetic core 11.

This is because the metal foils 17, 1 and
Since 8 is parallel, no induced current flows, so that the driving magnetic field is not weakened by the metal foils 17 and 18.
A metal foil 17 between the air-core coil 10 and
This is because the presence of 18 reduces the phenomenon that the air-core coils 10 are coupled to each other and the electromotive voltage drops.

On the other hand, with respect to the magnetic field from the direction perpendicular to the surface of the air-core coil 10, the electromotive voltage is reduced to 1/3 or less. The size of the metal foils 17 and 18 is desirably slightly larger than that of the air core coil 10 in order to reduce the coupling between the data carriers.

Since the composite data carrier of the present embodiment is configured as described above, the influence of the magnetic field generated by the current induced in the antenna of the adjacent data carrier and the influence of the metal plate existing in the vicinity are minimized. Can be held down. This makes it possible to reduce the mutual coupling between the data carriers while having a simple structure, and it is possible to prevent the communication distance from being shortened even when a plurality of data carriers are arranged in close contact with each other. Further, it is possible to reduce a reduction in communication distance when the composite data carrier approaches a metal object. Each data carrier ID ₁
When arranging ～ID ₄ of the orientation to be reversed alternately, i.e., in the case of FIG. 5 (A) the metal foil 17, 18 is not required.

[0031]

As described above, according to the present invention, according to the present invention, there is provided an antenna device for receiving an alternating magnetic field supplied from a reader / writer device and inducing a current. A composite data carrier comprising a plurality of data carriers that rectify an electromotive force and use the same as an operation power supply, the plate-shaped magnetic core being common to an air-core coil that receives an alternating magnetic field sent from the reader / writer device. To form a composite data carrier by integrally integrating a plurality of data carriers, so that interference due to current induced in each data carrier can be reduced as much as possible. As a result, a composite data carrier having a desired memory capacity can be configured by integrally integrating a plurality of data carriers without extremely reducing the communication distance.

Further, according to another feature of the present invention, since it can be constituted by simply inserting a plate-shaped magnetic core into a general-purpose air-core coil in common, it is easy to manufacture and a composite having a desired memory capacity is provided. The manufacturing cost of the data carrier can be reduced.

According to another feature of the present invention, it is possible to minimize the influence of the magnetic field generated by the current induced in the antenna of the adjacent data carrier and the influence of the surrounding metal plate. . As a result, mutual coupling between data carriers can be reduced, and shortening of the communication distance can be reduced even when a plurality of data carriers are closely attached to each other to form a composite data carrier. Further, it is possible to reduce a reduction in communication distance when the composite data carrier approaches a metal object.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration example of a composite data carrier according to a first embodiment of the present invention.

FIG. 2 is a sectional view showing a configuration example of a composite data carrier according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a configuration example of a composite data carrier according to a second embodiment of the present invention.

FIG. 4 is a perspective view showing a configuration example of a composite data carrier according to a third embodiment of the present invention.

FIG. 5 is a perspective view illustrating an arrangement example of an antenna device of a composite data carrier according to a third embodiment.

FIG. 6 is a diagram illustrating a configuration example of an antenna device of a composite data carrier according to a third embodiment.

[Explanation of symbols]

10 air-core coil 11 magnetic core 12 data carrier module 13 IC chip 14 tuning capacitance ID ₁ ~ID ₄ data carrier

Claims (7)

[Claims] 1. A data carrier having an antenna device for inducing a current by receiving an alternating magnetic field supplied from a reader / writer device, and rectifying an electromotive force induced by the antenna device and using the rectified electromotive force as an operation power supply. A composite magnetic data carrier comprising a plurality of data carriers, wherein a plate-shaped magnetic core is inserted through an air-core coil provided in each data carrier in order to receive an alternating magnetic field sent from the reader / writer device. A composite data carrier comprising a plurality of data carriers integrated together. 2. A data carrier having an antenna device for receiving an alternating magnetic field supplied from a reader / writer device and inducing a current, and rectifying an electromotive force induced by the antenna device and using the rectified electromotive force as an operation power supply. A plurality of data carrier modules, wherein the plurality of data carrier modules commonly use air-core coils arranged in each data carrier to receive an alternating magnetic field sent from the reader / writer device. A composite data carrier, wherein the plurality of data carriers are integrally formed. 3. A data carrier having an antenna device for inducing a current by receiving an alternating magnetic field supplied from a reader / writer device, and rectifying an electromotive force induced by the antenna device and using the rectified electromotive force as an operation power supply. A data carrier comprising an antenna device for receiving the alternating magnetic field, comprising: an air-core coil; and a plate-shaped magnetic core inserted through the air-core coil. Wherein a plurality of are arranged together so that the direction of the antenna device is alternately changed so as to be on the front side and the back side. 4. A data carrier having an antenna device for receiving an alternating magnetic field supplied from a reader / writer device and inducing a current, and rectifying an electromotive force induced by the antenna device and using the rectified electromotive force as an operation power supply. A composite data carrier comprising a plurality of antennas disposed on each data carrier for receiving the alternating magnetic field, an air-core coil wound in a plane, and a plane of the air-core coil. And a plurality of data carriers comprising metal foil on at least one surface of the air-core coil. A composite data carrier, characterized in that: 5. The composite data carrier according to claim 4, wherein the metal foil is disposed so as to substantially shield the entire air-core coil when viewed from a plane direction. 6. The composite data carrier according to claim 1, wherein said plate-shaped magnetic core is made of amorphous metal or permalloy. 7. The plate-shaped magnetic core is a unidirectional silicon steel plate, and the goss direction of the plate-shaped magnetic core is arranged so as to point in the axial direction of the air-core coil. The composite data carrier according to any one of claims 1 to 6, wherein