JP2001217640A - Reader writer for contactless data carrier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide antenna constitution for a reader writer, which has high signal transmission efficiency for a contactless data carrier system used for various ID systems, etc., so that a communication distance is secured and interference with other systems due to signal transmission from the reader writer is prevented. SOLUTION: For the antenna 16 of the reader writer 15, a magnetic body core 19 is arranged across a slit 18 for the insertion of a noncontact IC card 17, and when the noncontact IC card 17 is inserted into the slit 18, an antenna 20 of the noncontact IC card is arranged between the magnetic core 19 and antenna 16. Consequently, an electromagnetic wave radiated by the antenna 16 is converged on the magnetic core 19, so that it is efficiently transmitted to the antenna 20 of the noncontact IC card.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to various ID confirmations,
The present invention relates to a non-contact data carrier reader / writer that is used for financial transactions or product management, and performs wireless communication with a data carrier without the need for electrical contact by an electromagnetic induction coupling method.

[0002]

2. Description of the Related Art In recent years, a semiconductor integrated circuit in which circuits necessary for thinning are integrated on a semiconductor chip and a coil-shaped antenna are built in a card, and power is transmitted and received and data is transmitted and received using electromagnetic induction coupling or the like. A non-contact data carrier such as a non-contact IC card has been developed which performs the operation without an electric contact. This non-contact IC card does not need to be brought into contact with the main unit every time it is used, and since it has no contacts, there is no need to worry about dirt and corrosion, and it has the convenience that it can be designed more freely. Due to the high security and the large memory capacity that are the original features,
It is a product that can be expected to have a very large market in various fields, such as a D card.

[0003] For example, a non-contact IC card has a feature that it has a large storage capacity and a high security function, and can perform communication only by inserting the card itself into a slot of a reader / writer. No major parts are required and maintenance is free, and a great advantage can be considered for a prepaid card system used outdoors, an entry / exit card for opening and closing a door, a card for electronic money, and the like. Such a non-contact IC card exchanges information with a reader / writer using a medium such as radio waves. The electric power required for the operation of the control circuit and the memory section of the non-contact IC card rectifies the induced current due to the electromagnetic induction of the coiled antenna provided in the non-contact IC card by the radio wave transmitted from the reader / writer. Gained by things.

FIG. 7 shows a block diagram of a non-contact IC card system which is a kind of a conventional non-contact data carrier which operates by power supply or signal transmission from a reader / writer.

[0005] A reader / writer 1 for a non-contact IC card includes:
A control circuit 2 for controlling information signals and various circuits; a transmission circuit 3 for modulating and transmitting information signals; a reception circuit 4 for modulating received information signals; and a coil for transmitting and receiving radio waves of information signals Antenna 5.

The contactless IC card 6 has a coiled antenna 7 for transmitting and receiving radio waves of information signals, a rectifier 8 for rectifying the received radio waves, and converts the rectified radio waves to electric power to supply electric power to each circuit. A power supply circuit 9, a reception circuit 10 for modulating a received information signal, a transmission circuit 11 for modulating and transmitting an information signal, a memory unit 12 for storing information, and a memory unit for controlling various circuits; And a control circuit 13 for writing and reading information to and from the control circuit 12.

Next, the operation of the contactless IC card system will be briefly described.

[0008] A reader / writer 1 for a non-contact IC card includes:
The information signal generated by the control circuit 2 is modulated and amplified by the transmission circuit 3, and a radio wave is transmitted via the antenna 5. Non-contact IC
The card 6 is received by the antenna 7 and is used as a power source for various circuits of the non-contact IC card 6 by the rectifier circuit 8 and the power supply circuit 9, and the receiving circuit 10 demodulates the radio wave of the information signal. An operation of reading and writing information from and to the memory unit 12 is performed according to the content of the signal. In response to the reader / writer 1, information read from the memory unit 12 by the control circuit 13 is transmitted as radio waves from the antenna 7 through the transmission circuit 11.

The coiled antenna 5 of the reader / writer 1 and the coiled antenna 7 of the non-contact IC card 6
When the non-contact IC card 6 was inserted into the slit 14 of the reader / writer 1, the structure was as shown in FIG.

That is, the coil-shaped antenna 5 of the reader / writer 1 for a non-contact IC card is
When the non-contact IC card 6 is inserted into the slit 14, the antenna 7 of the non-contact IC card 6 is connected to the reader / writer 1.
Of the structure arranged on the antenna 5 of FIG.

[0011]

However, as shown in FIG. 8, the electromagnetic wave from the coiled antenna 5 on which the reader / writer 1 is installed has a magnetic field line 21 because both coiled antennas are air-core. There is a problem that the electromagnetic waves are not efficiently transmitted to the antenna 7 of the non-contact IC card 6 without being converged.

In particular, in a conventional non-contact IC card system, there is a system in which electric power required for the non-contact IC card is supplied by electromagnetic induction from a reader / writer. In this case, an electromagnetic wave of large electric power is supplied to the non-contact IC card. Although it is necessary to supply the power to the antenna 6, in the conventional structure, since the transmission efficiency is poor, it is necessary to emit a strong electromagnetic wave from the antenna 5 of the reader / writer. Therefore, there has been a problem that interference with other systems is likely to occur, and power consumption is large because radio waves are always emitted.

A structure in which an ultra-thin magnetic core is disposed inside the antenna of a non-contact IC card is also conceivable.
Since it is difficult to mount the magnetic core thinly, there is a problem that mass production is inferior industrially in the production of a non-contact IC card.

[0014]

According to the present invention, there is provided a reader / writer for a non-contact data carrier, wherein a slit for inserting and removing a non-contact data carrier is provided to achieve the above object.
A coil-shaped first antenna installed on one side of the slit and a magnetic core installed on the opposite side of the first antenna with the slit interposed therebetween;
When the non-contact data carrier is inserted into the slit, the coil-shaped second of the non-contact data carrier
Is disposed between the first antenna and the magnetic core.

Thus, the second contactless data carrier can be used.
The magnetic core is disposed in the reader / writer opposite to the first antenna of the reader / writer with the slit interposed therebetween without disposing the ultra-thin magnetic core inside the antenna. And the electromagnetic wave (magnetic flux) emitted from the first antenna of the reader / writer is converged on the magnetic core, so that the electromagnetic wave is efficiently transmitted to the second antenna of the non-contact data carrier. Is done.

The reader / writer for a non-contact data carrier according to the present invention includes a slit for taking in and out the non-contact data carrier, a coil-shaped first antenna installed on one side of the slit, and a first antenna. A first magnetic core provided on the opposite side of the antenna with a slit therebetween, and a second magnetic core provided inside the first antenna; When the carrier is inserted, the coil-shaped second antenna of the non-contact data carrier is arranged between the first magnetic core and the second magnetic core.

Thus, the second magnetic core is also provided inside the first antenna of the reader / writer, so that the electromagnetic wave (magnetic flux) emitted from the first antenna of the reader / writer is not affected by the first magnetic field. Since the light is converged on both the body core and the second magnetic body core, the electromagnetic wave is more efficiently transmitted to the second antenna of the non-contact data carrier.

Further, in the reader / writer for a non-contact data carrier according to the present invention, the first magnetic core and the second magnetic core are connected to each other by a third magnetic body passing outside the first antenna. Is what is being done.

Thus, the electromagnetic wave (magnetic flux) emitted from the first antenna of the reader / writer forms a magnetic path by the first magnetic core, the second magnetic core, and the third magnetic substance. Since the second antenna of the non-contact data carrier is arranged between the gaps, electromagnetic waves can be transmitted to the second antenna more efficiently without leakage of magnetic flux.

Further, in the reader / writer for a non-contact data carrier according to the present invention, the first magnetic core, the second magnetic core, and the third magnetic material are formed of a magnetic material integrally formed of the same magnetic material. Is what is being done.

As a result, the resistance of the magnetic path is reduced, so that the electromagnetic wave (magnetic flux) emitted from the first antenna of the reader / writer is more efficiently transmitted to the non-contact data carrier second antenna.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a non-contact data carrier reader / writer according to the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 shows a reader / writer for a non-contact data carrier according to a first embodiment of the present invention. FIG. 2 is a schematic sectional view of an IC card.

In this structure, the coiled antenna 16 of the reader / writer 15 for a non-contact IC card is installed on one side of the slit 18 into which the non-contact IC card 17 is inserted, and the magnetic core 19 is connected to the slit 18. Antenna 1 across
When the non-contact IC card 17 is inserted into the slit 18 while being installed on the side of the slit 18 opposite to the side 6, the non-contact between the antenna 16 of the reader / writer 15 and the magnetic core 19 is prevented. The coil-shaped antenna 20 of the IC card 17 is provided.

With this structure, the electromagnetic wave (magnetic flux) emitted from the antenna 16 of the reader / writer 15 for the non-contact IC card
As shown in FIG. 2, the magnetic force lines 2
Since 1a is converged and passes through the antenna 20 of the non-contact IC card, power and signals are efficiently transmitted from the antenna 16 of the reader / writer to the antenna 20 of the non-contact IC card. Therefore, there is no need to emit a large output electromagnetic wave from the reader / writer 15, and it is possible to eliminate interference with other systems and to construct a power-saving communication system.

(Embodiment 2) FIG. 3 shows a reader / writer for a non-contact data carrier according to a second embodiment of the present invention. FIG. 2 is a schematic sectional view of an IC card.

In this structure, a coil-shaped antenna 16 of a reader / writer 15 for a non-contact IC card is installed on one side of a slit 18 into which the non-contact IC card 17 is inserted, and is provided inside the antenna 16. A magnetic core 22 is provided, another magnetic core 19 is provided on the side of the slit 18 opposite to the antenna 16 with the slit 18 interposed therebetween, and the non-contact IC card 17 is inserted into the slit 18. Sometimes, the coiled antenna 20 of the non-contact IC card 17 is placed between the magnetic core 19 and the magnetic core 22.
Are arranged.

With this structure, the electromagnetic wave (magnetic flux) emitted from the antenna 16 of the reader / writer 15 for the non-contact IC card
As shown in FIG. 4, since the magnetic lines of force 21b are further converged by the two magnetic cores 19 and 22 and pass through the antenna 20 of the non-contact IC card as compared with the first embodiment, power and signals are reduced. It is efficiently transmitted from the antenna 16 of the reader / writer to the antenna 20 of the non-contact IC card.

In particular, a reader / writer 1 for a non-contact IC card
In the case where the antenna 20 of the non-contact IC card 17 is smaller than that of the antenna 16 of FIG. Therefore, there is no need to emit a high-output electromagnetic wave from the reader / writer, interference with other systems is eliminated, and a power-saving system can be constructed.

(Embodiment 3) FIG. 5 shows a reader / writer for a non-contact data carrier according to a third embodiment of the present invention. FIG. 2 is a schematic sectional view of an IC card. 1 and 3 shown in the first and second embodiments are drawings in which the slit is viewed from the side, while FIG. 5 is a drawing in which the slit is viewed from the front.

This structure is different from the structure of FIG. 3 shown in the second embodiment in that two magnetic cores 19 and 22 are connected by a magnetic body 23 through the outside of an antenna 16 of a reader / writer, and A circuit is formed. The two magnetic cores 19 and 22 and the magnetic body 23 may be integrally formed of the same magnetic material. Note that the same components as those shown in FIG. 3 of the second embodiment are denoted by the same reference numerals, and description thereof will be omitted.

With this configuration, as shown in FIG. 6, the magnetic circuit forms a closed circuit with the integrated magnetic core and the gap of the slit into which the non-contact IC card is inserted. Contact IC card antenna 2
0, the antenna 16 of the reader / writer
Since the magnetic field lines 21c due to the electromagnetic waves emitted from the antenna are transmitted within the magnetic core having a small loss, the loss can be efficiently transmitted to the antenna 20 of the non-contact IC card with a small loss, and the transmission efficiency can be further improved. .

Since the electromagnetic wave emitted from the antenna 16 of the reader / writer is confined by the magnetic core forming the magnetic circuit, the effect of preventing interference with the outside can be further enhanced.

As described above, in the present embodiment, only the non-contact IC card has been described as the non-contact data carrier. However, it is needless to say that the present invention can be applied to a non-contact IC tag whose substrate is not a card.

[0035]

According to the reader / writer for a non-contact data carrier of the present invention, a magnetic core is provided on the reader / writer side so that the electromagnetic waves from the non-contact data carrier reader / writer can be efficiently converged in order to converge the electromagnetic waves. Non-contact I
Can be transmitted to C card. In this structure, the magnetic core is not installed on the non-contact IC card, so that the non-contact IC card produced by the conventional method can be used, and the ultra-thin magnetic core is installed on the reader / writer side. It is of great industrial value because it is not cast.

Further, since the transmission efficiency is improved, it is not necessary to output a large output from the reader / writer, so that the effects of reducing interference with other systems and low power consumption can be obtained.

[Brief description of the drawings]

FIG. 1 is a non-contact IC according to a first embodiment of the present invention.
Schematic cross-sectional view of a non-contact IC card inserted into an antenna section and a slit of a card reader / writer

FIG. 2 is a non-contact IC according to the first embodiment of the present invention;
Schematic diagram of lines of magnetic force of a card reader / writer

FIG. 3 is a non-contact IC according to a second embodiment of the present invention;
Schematic cross-sectional view of a non-contact IC card inserted into an antenna section and a slit of a card reader / writer

FIG. 4 is a non-contact IC according to a second embodiment of the present invention;
Schematic diagram of lines of magnetic force of a card reader / writer

FIG. 5 is a non-contact IC according to a third embodiment of the present invention;
Schematic cross-sectional view of a non-contact IC card inserted into an antenna section and a slit of a card reader / writer

FIG. 6 is a non-contact IC according to a third embodiment of the present invention;
Schematic diagram of lines of magnetic force of a card reader / writer

FIG. 7 is a block diagram showing a configuration of a conventional contactless IC card system.

FIG. 8 is a schematic sectional view of a non-contact IC card inserted into an antenna portion and a slit of a conventional reader / writer for a non-contact IC card.

[Explanation of symbols]

 15 Reader / writer 16, 20 Antenna 17 Non-contact IC card 18 Slit 19, 22 Magnetic core 21a, 21b, 21c Magnetic field lines 23 Magnetic

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor ▲ Taka ▼ Miya Izuo 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 5B058 CA17 KA40 5K012 AA03 AB02 AB12 AC06 AC08 AC10 AE13 BA00

Claims (4)

[Claims] 1. A slit for taking a non-contact data carrier in and out, a coil-shaped first antenna provided on one side of the slit, and a coil-like first antenna provided on the opposite side of the slit with respect to the first antenna. When the non-contact data carrier is inserted into the slit, the coil-shaped second antenna of the non-contact data carrier is disposed between the first antenna and the magnetic core. A reader / writer for a non-contact data carrier, wherein the reader / writer is arranged in a non-contact data carrier. 2. A slit for taking in and out a non-contact data carrier, a first coil-shaped antenna installed on one side of the slit, and an opposite side of the first antenna with the slit interposed therebetween. A first magnetic material core and a second magnetic material core installed inside the first antenna, and when the non-contact data carrier is inserted into the slit, the non-contact data carrier A reader / writer for a non-contact data carrier, wherein a second coil-shaped antenna of a carrier is arranged between the first magnetic core and the second magnetic core. 3. The non-magnetic circuit according to claim 2, wherein the first magnetic core and the second magnetic core are connected by a third magnetic body passing outside the first antenna. Reader / writer for contact data carrier. 4. The magnetic head according to claim 3, wherein the first magnetic core, the second magnetic core, and the third magnetic body are formed of a magnetic material integrally formed of the same magnetic material. Reader / writer for non-contact data carriers.