JP2000306066A - Non-contact ic card and system therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent information leakage, invalid transaction, unwanted interference with a system of different type and malfunction. SOLUTION: This system is provided with a means for receiving the energy of an electromagnetic field radiated from an external device, an integrated circuit 2 capable of being operated by driving power supplied by the energy of the electromagnetic field and a switch 3, which is provided in the means (electromagnetic induction coil 4) for receiving the energy of the electromagnetic field, for switching the inductance of this means. Thus, when an IC card 8 is made close to a reader/writer in the state of inhibiting the operation of the IC card 8 by turning off the switch 3, since no current is generated on the electromagnetic induction coil 4, the interference to the side of the reader/writer can be suppressed to a minimum. As a result, even when any other card different from this IC card 8 is carried close to the same reader/writer and communication is performed, possibility for disturbance to be applied to the operation of these cards can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact type IC card and its system, and more particularly to power supply and data communication utilizing an electromagnetic induction phenomenon or electromagnetic waves. For example, the invention provides data carriers, tags, permits,
It is used as identification cards, electronic cash, memory cards, prepaid cards, telephone cards and the like.

[0002]

2. Description of the Related Art Conventionally used IC cards are:
Depending on the form of a physical interface serving as communication means with a communication partner device (read / write device, interrogator, interrogator, etc., hereinafter referred to as a read / write device), it is classified into a contact type and a non-contact type. .

In a contact type IC card, power is supplied to the card and data signals are transmitted through electrical contacts. Therefore, the card is inserted into a slot of a read / write device and both contacts are connected. Thus, an operable state is attained for the first time. Therefore, unless the user consciously inserts the card into the slot, the card does not operate and the card does not operate unconsciously.

[0004] On the other hand, non-contact type IC cards mainly receive power supply required for operating a mounted IC from a read / write device via an electromagnetic induction phenomenon or electromagnetic waves. Therefore, if an IC card is brought into the vicinity of the read / write device during the operation of the read / write device, the IC card obtains power by electromagnetic induction and automatically starts a circuit to start operation. There is a possibility that it will. Therefore, if the card owner unintentionally brings the card into the vicinity of the reader / writer, data is exchanged between the reader / writer and the card unknowingly, resulting in information leakage and the like. Problems such as invalid transactions may occur. Therefore, in order to solve such a problem, in a conventional non-contact type IC card system, a protection means is generally taken for the entire system from a viewpoint of software or an operation form.

[0005]

However, for a read / write device manufactured for the purpose of illegally reading information, it is necessary to prevent the unauthorized use unless relying on advanced technical means such as encryption. Is impossible. Therefore, the card holder must always pay attention to such a situation. Further, with the spread of IC cards in the future, it is expected that various read / write devices having the same carrier frequency but different output powers and applications will be used. That is, one person owns a card of a plurality of systems, and interference with a different system and malfunction may cause a serious problem.

An object of the present invention is to provide a non-contact type IC card which prevents information leakage, invalid transactions, unnecessary interference with different types of systems, and malfunctions, and a system therefor. With the goal.

[0007]

In order to achieve the above object, a non-contact type IC card according to the present invention comprises: means for receiving electromagnetic field energy radiated from an external device;
An integrated circuit operable by the driving power supplied by the energy of the electromagnetic field; and a switch provided on the means for receiving the energy of the electromagnetic field and switching an inductance of the means.

Further, the present invention includes the following configuration as another embodiment. That is, the means for receiving the energy of the electromagnetic field is an electromagnetic induction coil. The means for receiving the energy of the electromagnetic field is a strip antenna. The means for receiving the energy of the electromagnetic field is a slot antenna. The means for receiving the energy of the electromagnetic field is a bowtie antenna. The switch is
It is connected in series to the means for receiving the energy of the electromagnetic field. The switch is connected in parallel to the means for receiving the energy of the electromagnetic field. Driving power is supplied by receiving the energy of the electromagnetic field radiated from the external device, and in a non-contact type IC card which enables information transmission with the external device, The integrated circuit includes means for receiving energy, an integrated circuit operable by the driving power, and a switch for switching between an operation-inhibited state and an operable state of the integrated circuit.

On the other hand, a non-contact type IC card system according to the present invention comprises: means for receiving electromagnetic field energy radiated from an external device; and an integrated circuit operable by driving power supplied by the electromagnetic field energy. And a means for varying the inductance of the means by contacting a part of the means for receiving the energy of the electromagnetic field.

Further, the present invention includes the following configuration as another embodiment. That is, the means for varying the inductance includes at least two terminals provided on a part of the means for receiving the electromagnetic field energy in a state where the non-contact type IC card is sandwiched between the conductive members. Short-circuited card clip. The means for varying the inductance includes at least two parts provided in a part of the means for receiving the energy of the electromagnetic field in a state where the non-contact type IC card can be mounted and the non-contact type IC card is mounted. This is a card folder that has a structure to short-circuit terminals.

[0011] The card folder has means for communicating with the IC card. The means for receiving the energy of the electromagnetic field is an electromagnetic induction coil. The means for receiving the energy of the electromagnetic field is a strip antenna. The means for receiving the energy of the electromagnetic field is a slot antenna. The means for receiving the energy of the electromagnetic field is a bowtie antenna. The switch is
It is connected in series to the means for receiving the energy of the electromagnetic field. The switch is connected in parallel to the means for receiving the energy of the electromagnetic field.

[0012] In a system using a non-contact type IC card that receives driving energy by receiving the energy of an electromagnetic field radiated from an external device and enables information transmission with the external device, Means for receiving the energy of the electromagnetic field, an integrated circuit connected to the means for receiving the energy of the electromagnetic field and drivable by the driving power, and two terminals provided in a part of the means for receiving the energy of the electromagnetic field. And an IC card formed of a conductive member and a card clip for short-circuiting the two terminals by sandwiching the IC card.

[0013] In a system using a non-contact type IC card which is supplied with driving power by receiving the energy of an electromagnetic field radiated from an external device and enables information transmission to and from the external device, Means for receiving the energy of the electromagnetic field, an integrated circuit connected to the means for receiving the energy of the electromagnetic field and drivable by the driving power, and two terminals provided in a part of the means for receiving the energy of the electromagnetic field. An IC card provided with the IC card, and a card folder having a conductive member capable of mounting the IC card and short-circuiting the two terminals when the IC card is mounted.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings.

[First Embodiment] FIG. 1 is a plan view showing one embodiment of the present invention. As shown in FIG. 1, the IC card 8 includes a substrate 1, an IC 2, and a switch 3.
And an electromagnetic induction coil 4. One end of the electromagnetic induction coil 4 formed on the surface of the substrate 1 which is a card base material is directly connected to a predetermined terminal of the IC 2, and the other end is connected to a predetermined terminal of the IC 2 via the switch 3. I have. Therefore, when the switch 3 is in the conductive state, the IC
The card 8 operates normally, and when the switch 3 is turned off, the operation of the IC card 8 can be prohibited.

The feature of this embodiment is that the switch 3
In a state where the operation of the IC card 8 is prohibited and the IC
When the card 8 is brought close to the read / write device, no current is generated in the electromagnetic induction coil 4, so that interference with the read / write device can be minimized. As a result, even if another card other than the IC card 8 is brought into the vicinity of the same read / write device and performs communication, the possibility of disturbing the operation of these cards can be reduced.

FIG. 2 is a circuit diagram showing the IC card 8. As shown in the figure, IC2 is a resonance capacitor 2a.
, A full-wave rectifier circuit 2b, a smoothing capacitor 2c, a clock generation circuit 2d, a constant voltage circuit 2e, and a demodulation circuit 2f.
, Modulation circuit 2g, power-on reset circuit 2h
And a digital circuit 2i. Digital circuit 2
i is configured by a ROM, a RAM, and a nonvolatile memory in addition to the CPU, and further includes a coprocessor, a clock generator, an initial response protocol control circuit, an interface circuit for asynchronous communication with an analog unit, and the like in some cases. . When an electromagnetic field radiated from an external read / write device is tuned by the resonance capacitor 2a, a voltage is induced in the antenna 4.

The voltage induced by the antenna 4 is rectified by a full-wave rectifier circuit 2b, and then rectified by a smoothing capacitor 2.
After being smoothed in c, it is supplied to the constant voltage circuit 2e and the demodulation circuit 2f. The constant voltage circuit 2e has a predetermined voltage VDD.
Is generated and supplied to the digital circuit 2i.
f demodulates the received signal and supplies it to the digital circuit 2i. The clock generation circuit 2d generates a clock CLK from the voltage induced by the antenna 4, and supplies the clock CLK to the digital circuit 2i.

The power-on reset circuit 2h includes a clock generated by the clock generation circuit 2d and a constant voltage circuit 2d.
And the outputs of the demodulation circuit 2f and the modulation circuit 2g are monitored, and it is determined whether or not sufficient power is supplied to operate the digital circuit 2i based on the monitoring results. A reset signal for starting driving. The digital circuit 2i receives the clock CLK
, And operates based on the signal supplied from the demodulation circuit 2f. Therefore, processing of a signal supplied from an external read / write device is performed by the digital circuit 2.
i. The digital circuit 2i can also transmit a signal to an external read / write device, and transmits information via the modulation circuit 2g and the antenna 4.

Here, the difference in effect between the case where a conventionally used soft switch is used and the case where a hard switch which is a feature of the present invention is used will be described.

FIG. 3 is a table showing the difference between the effects of using a hard switch / soft switch. First, when a soft switch is used, a power supply is required to maintain the on / off state of the switch, whereas a hard switch does not require such a power supply. Regarding the operability, the soft switch requires a conscious operation such as inputting a preset key and is complicated,
Hard switches are simple. Further, regarding the tamper resistance, the soft switch needs to set the prohibition of the switch operation in the upper layer, whereas the hard switch may set the operation prohibition in the physical layer. Also,
Hard switches have the advantage that they are simple and inexpensive.

Since the switch 3 is inserted so as to disconnect the circuit, a faulty contact failure of the switch 3 may cause a malfunction of the circuit. Therefore, it is necessary to use an appropriate reliable switch 3. The insertion point of the switch 3 may be other than the connection point between the electromagnetic induction coil 4 and the IC 2, and the same effect can be expected at any point of the electromagnetic induction coil 4. However, the electromagnetic induction coil 4 is often formed integrally with the substrate 1, the IC 2 is often mounted on a pedestal (carrier) smaller than the substrate 1 and then embedded in the substrate 1, Considering that it can be used for mounting, it is most preferable to insert the switch 3 at the connection point between the IC 2 and the electromagnetic induction coil 4 as shown in FIG. This is excellent in terms of cost and reliability as a card. As a form of the switch 3, a slide type or a push button type suitable for the shape of the card can be considered.

The configuration of the electromagnetic induction coil (see the electromagnetic induction coil 4a in FIG. 4) and the antenna in the present embodiment is the same as that of the conventional non-contact type IC card. For example, if you use longwave to shortwave frequencies,
A conductor wire is wound and embedded in the card, or is formed as a conductive foil pattern on a surface of a substrate serving as a base material of the card by using a technique such as printing, plating, or etching. If the antenna uses a frequency in the microwave band, a strip antenna (see strip antenna 4b in FIG. 5), a slot antenna (see slot antenna 4c in FIG. 6), a bow tie antenna (see FIG. (See Bowtie antenna 4d).

Further, after connecting the electromagnetic induction coil, antenna and IC so that the card functions,
An IC card is completed by sealing another circuit board to protect the circuit. At this time, it is necessary to expose the movable portion of the switch to the surface of the bonded card base material so that the switch can be operated with a finger or the like. On the other hand, when a push-button switch is used, the entire switch may be covered with a card base material on a thin film so that the switch can be operated from above the card base material. The communication may always be disabled, and the communication may be performed only while the switch is pressed by a finger, or the switch may be switched on / off each time the switch is pressed. As a specific example of such a push-button switch, for example, a tactile switch 3a manufactured by OMRON Corporation as shown in FIG. 8 can be used. This switch is 4.7mm long and 0.4mm thick.
It is an ultra-thin and ultra-light switch with a mm and a mass of 0.01 g, and is suitable for a switch of an IC card.

[Second Embodiment] FIG. 9 is a plan view showing a second embodiment of the present invention. As shown in the figure, both ends of an electromagnetic induction coil 4 formed on the surface of a substrate 1 as a card base material are directly connected to predetermined terminals of an IC 2. The switch 3a is connected to the electromagnetic induction coil 4 and the IC 2
Are inserted so as to short-circuit between the two terminals connecting. Therefore, when the switch 3a is disconnected, the IC card 8 operates normally. When the switch 3a is turned on, the connection point between the electromagnetic induction coil 4 and the IC 2 is short-circuited, and the operation of the IC card 8 can be prohibited. According to this configuration, since the switch 3a operates normally in the disconnected state, even if a faulty contact failure occurs in the switch 3a, the normal operation is not hindered. Incidentally, poor contact failures occupy the majority of failure modes.

On the other hand, when the switch 3a is set to the conductive state and the card operation is prohibited and the one whose card operation is prohibited is brought close to the read / write device, a current flows through the electromagnetic induction coil 4 via a short-circuit path of the switch 3a. For this reason, when another card other than the IC card 8 is brought into the vicinity of the same read / write device and performing communication, there is a possibility that the operation of these cards may be slightly disturbed. Of course, it is of course possible to design so as not to cause a problem in the operation and functions of other cards.

[Third Embodiment] FIG. 10 shows a third embodiment of the present invention. As shown in the figure,
Terminals at both ends of the electromagnetic induction coil 4 formed on the surface of the substrate 1 which is a card base material are connected to predetermined terminals of the IC 2. The switch 3b is connected so as to short-circuit two points in the middle of the conductor pattern constituting the electromagnetic induction coil 4, and is designed so that the IC card 8 operates normally when the switch 3b is cut off. When the switch 3b is in the conductive state, the inductance of the electromagnetic induction coil 4 greatly changes from the value at the time of normal operation, and a state in which required power is not supplied, that is, a state in which the operation of the card is prohibited.

[Fourth Embodiment] FIG. 11 is a plan view showing a fourth embodiment of the present invention. The present embodiment is a specific example for numerically indicating a change in the inductance value, and is a type 1 card 8 (the size is 85.6 mm in width and 53.6 mm in height) specified in ISO / IEC7810.
This is an example of a layout applied to a thickness of 98 mm and a thickness of 0.76 mm). As shown in FIG.
Embossed areas 6 and 7 defined in ISO / IEC 7810 (in this area, for example, card numbers, card owner names and expiration dates are formed so as to protrude on the surface of substrate 1) and magnetic stripe areas 5 are arranged so as to avoid the periphery. Both terminals of the electromagnetic induction coil 4 are connected to predetermined terminals of the IC 2. The switch 3d connects the electromagnetic induction coil 4 in the conductive state to the state shown in FIG.
Short-circuit at the position shown in. Set the line width of the electromagnetic induction coil 4 to 0.
The self-inductance when 5 mm and the pitch is 1.0 mm and two turns are wound is about 1 μH when the switch 3d is in the cut state.

FIG. 12A shows an equivalent circuit of the electromagnetic induction coil 4 when the switch 3d in FIG. 11 is disconnected.
The inductance 10 is 1 μH, and the resistance 11 represents the conductor loss of the coil. FIG. 12B shows an equivalent circuit of the electromagnetic induction coil 4 when the switch 3d is connected. The inductance 10a of the circuit in FIG.
This is the self-inductance of a loop that goes around the switch 3d and returns to the terminal at the other end of the IC2. The inductance 10b is about 0.29 μH, which is the self-inductance of another closed loop caused by turning on the switch 3d. The mutual inductance M between the two inductances is approximately 0.18
μH. The resistors 11a and 11b each have a resistance of 10
a represents the conductor loss associated with the inductance loop of 10b, typical values being several tens of ohms when the coil is made by printing technology, and less than a few ohms by plating and etching technology.

When the entire circuit of FIG. 12B is viewed from the terminal, the effective inductance value is
Although it depends on the value of b, it is estimated that the range is approximately 0.18 to 0.29 μH. In short, in the example shown in FIG. 11, the self-inductance value of the electromagnetic induction coil can be changed to 1/3 to 1/5 by opening and closing the switch. The rate of change can be determined by changing the card from a normal operation to an operation prohibited state by using an inductive M-type coupling circuit as the coupling circuit configuration of the card and the read / write device and designing the circuit to have a somewhat higher Q value. That's enough.

In the above example, the number of turns of the electromagnetic induction coil 4 was calculated on a trial basis, but if the number of turns is increased, a larger inductance change can be obtained depending on the selection of a short-circuit contact by a switch. Is also possible.

[Fifth Embodiment] FIGS. 13A and 13B
(B) is a perspective view showing a fifth embodiment of the present invention. As in the case of the example shown in FIG. 11, the electromagnetic induction coil 4 is arranged around the embossed regions 6, 7 and the magnetic stripe region 5 so as to avoid these regions. Are connected to predetermined terminals of IC2. The conductor of the electromagnetic induction coil to which the switch was connected is exposed on the card surface as an electrode 3e,
Surface treatment as an electrical contact is performed. When a metal card clip 20 is sandwiched in this portion, the electrodes exposed on the surface are short-circuited and the operation of the card is prohibited. The card clip 20 has a structure that is thin and closely adheres to the card so as not to hinder other functions as the card.

The positions where the electrodes are provided are not limited to those described above. For example, as shown in FIG. 14, the electrode 3f may be provided by skipping one turn. The more turns that are skipped, the greater the variation in inductance. Therefore, the number of turns to be skipped and which turn is to be short-circuited may be determined according to the required change in inductance value. For example, as shown in FIG. 15A, in a state where a short circuit is not performed by a switch,
The inductance L is 1.6 to 2.0 μH.
As shown in FIG. 5 (b), when the first and second turns are short-circuited from the inside and the third and fourth turns are short-circuited,
The inductance L is 0.30 to 0.34 μH. When all the turns are short-circuited as shown in FIG. 15C, the inductance L becomes 0.14 to 0.18 μH, which short-circuits the innermost and outermost turns as shown in FIG. 15D. The same result as in the case.

[Sixth Embodiment] FIGS. 16A and 16B
(B) is a perspective view showing a sixth embodiment of the present invention. FIG. 16C is a cross-sectional view taken along line AA ′ of FIG. 13 (a) and 13 (b), only the terminal portion is sandwiched between the card clips 20, but a card folder which performs the same function may be used. In other words, the I / O
When the C card 8 is inserted, the metal plate 31 having the spring structure 32 provided inside the folder is pressed against the electrode 3e to short-circuit the two electrodes 3e. Therefore, the IC card 8
Does not operate while it is attached to the card folder 30, and enters a use-prohibited state.

It should be noted that the shape of the card / folder is not limited to those described above, and the following modifications are also included in the present invention. For example, FIGS. 17 (a), 17 (b), 1
As shown in FIG. 7 (c), the spring structures 31a, 31b, 31
c, 31d and metal plates 32a, 32b, 32c, 32
If d is provided at the four corners in the holder, the use prohibited state of the IC card 8 can be realized irrespective of the card insertion direction and the front and back. In addition, FIG.
As shown in FIGS. 18 (b) and 18 (c), the size of the card folder 30 may be smaller than the size of the IC card 8. Further, FIGS.
As shown in (b) and 19 (c), a leaf spring structure may be used as a structure for short-circuiting the electrodes. A leaf spring 32 is provided inside the card folder 30, and the electrodes of the inserted card are short-circuited. In this case, a recess 30a may be provided in the card folder so that a part of the bent leaf spring 32 can be retracted when the card is inserted.

The detailed peripheral structures of the electrode 3j and the leaf spring 32 are as shown in FIGS. 20 (a) and 20 (b). In this example, the electrode 3j is provided by skipping two turns. The electromagnetic induction coil 4 provided on the substrate 1 is covered with an insulating protective sheet 1a, and an opening is provided so that only the electrode 3j is exposed. The size of each part is, for example, as shown in FIG. 20C, the size of the electrode 3j is 2 mm, the width of the electromagnetic induction coil 4 is 0.5 to 1 mm,
The thickness of the electrode 3j and the electromagnetic induction coil 4 is 30 to 50 μm
m, the thickness of the protective sheet 1a is 50 to 150 μm,
The size of the opening j is 1.8 μm □. The thickness of the card (including the protection sheet 1a) is 760 μm.

[Seventh Embodiment] FIG. 21 is a block diagram showing a seventh embodiment of the present invention. As shown in the figure, the card folder 30 of the present embodiment is different from the configuration of the sixth embodiment in that a control unit 33 for controlling and calculating each unit and a communication unit 34 for communicating with the IC card 8 are provided.
And input means 35 for performing key input by the user
And display means 36 for displaying various kinds of information according to the control of the control means 33. Although the card folder 30 in the sixth embodiment is merely a container for storing the IC card 8, the card folder 30 is provided with an active function such as a calculation function, a display function, and a communication interface. By preparing, P
It can also be used as DA (Personal Digital Assistants). In that case, the card folder 30
Not only prohibits the IC card 8 from communicating with an external terminal (reader / writer), but also communicates with the IC card 8 in place of the external terminal to read information from the card,
Write information on the card.

Switching of communication with an external terminal or a card folder is performed as follows. FIG. 22 (a),
As shown in FIGS. 22 (b) and 22 (c), when the switch is turned off, the self inductance becomes 1.8 μH and the resonance frequency becomes 13.56 MHz, and when the switch is turned on, the self inductance becomes 0.16 μH. The resonance frequency is 45.5 MHz. Therefore, if communication is performed with the card folder 30 at a resonance frequency (45.5 MHz) at which communication with the external terminal is impossible, the card inside the card only by the card folder 30 without performing communication with the external terminal. Can read and write information.

In the first to seventh embodiments,
Although the IC 2 is operated in combination with an induction electromagnetic field (proximal magnetic field) generated by an external device, the present invention includes a device in which power is supplied by an electromagnetic wave (radiated electromagnetic field) radiated from the external device. Even in that case, the same effect as described above can be obtained. Further, an antenna for power supply and an antenna for information transmission may be separately provided, and a switch may be provided on one or both of them, and the same effect as described above can be obtained.

[0040]

As described above, according to the present invention, the inductance can be reduced by providing a switch for short-circuiting or disconnecting a part of the conductor forming the electromagnetic induction coil or the antenna serving as the non-contact interface of the IC card. It is variable and can inhibit the operation of the card even if the card is brought near the read / write device. Therefore, information leakage due to fraud, invalid transactions,
It is possible to prevent unnecessary interference and erroneous operation with a heterogeneous system, and the card owner can reliably protect the card and the information held in the card. In the future, it is expected that cards equipped with a non-contact type interface will be widely spread, and the present invention provides one of the most effective solutions for solving problems expected in the process of spreading the cards. Things.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a first embodiment.

FIG. 3 is a table showing characteristics of hard switches / soft switches.

FIG. 4 is a plan view showing an IC card using an electromagnetic induction coil.

FIG. 5 is a plan view showing an IC card using a strip antenna.

FIG. 6 is a plan view showing an IC card using a slot antenna.

FIG. 7 is a plan view showing an IC card using a bowtie antenna.

FIG. 8 is a sectional view showing a tactile switch in the IC card.

FIG. 9 is a plan view showing a second embodiment of the present invention.

FIG. 10 is a plan view showing a third embodiment of the present invention.

FIG. 11 is a plan view showing a fourth embodiment of the present invention.

FIG. 12A is a circuit diagram showing an equivalent circuit in a disconnected state of the switch according to the fourth embodiment, and FIG.
FIG. 9 is a circuit diagram showing an equivalent circuit in a connection state of a switch in the embodiment.

13A is a perspective view showing a fifth embodiment of the present invention (before clip attachment), and FIG. 13B is a perspective view showing a fifth embodiment of the present invention (after clip attachment).

FIG. 14 is a plan view showing a modification of the fifth embodiment.

FIG. 15 (a) is an explanatory diagram for explaining an inductance value in a state where no short circuit is made, and FIG. 15 (b) a short circuit between the first turn and the second turn from the inside, and a third turn and a fourth turn. For explaining the inductance value when all the turns are short-circuited, (c) for explaining the inductance value when all the turns are short-circuited, and (d) the innermost turn and the outermost turn. FIG. 9 is an explanatory diagram for explaining an inductance value in a state where is short-circuited.

16A is a perspective view showing a sixth embodiment of the present invention (before inserting a card), FIG. 16B is a perspective view showing a sixth embodiment of the present invention (after inserting a card), and FIG. FIG. 3 is a sectional view taken along line AA ′.

17A is a perspective view showing a modification of the sixth embodiment, FIG. 17B is a sectional view taken along line BB ′, and FIG. 17C is a sectional view taken along line CC ′.

18A is a perspective view showing a modification of the sixth embodiment (before card insertion), FIG. 18B is a perspective view showing a modification of the sixth embodiment (after card insertion), and FIG. It is DD 'line sectional drawing.

19A is a perspective view showing a modification of the sixth embodiment, FIG. 19B is a sectional view taken along line EE ′ (before inserting a card),
(C) It is the EE 'line sectional view (after card insertion).

20A is a plan view showing details of an electrode and a leaf spring, FIG. 20B is a cross-sectional view showing details of an electrode and a leaf spring,
(C) It is sectional drawing which shows the magnitude | size of an electrode and a leaf spring.

FIG. 21 is a block diagram showing a seventh embodiment of the present invention.

22A is a graph illustrating a seventh embodiment (frequency characteristic) of the present invention, and FIG. 22B is a diagram illustrating a relationship between the opening and closing of a switch, a self-inductance, and a resonance frequency according to the seventh embodiment of the present invention. (C) is a table showing a seventh embodiment of the present invention (opening / closing of a switch, a communication state between an external terminal and an IC card, and a communication state between a card folder and an IC card).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Board, 2 ... IC, 3 ... Switch, 4 ... Electromagnetic induction coil, 8 ... IC card.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshinori Fukunaga 2-3-1 Otemachi, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Kota Ieho 2-chome Otemachi, Chiyoda-ku, Tokyo No. 3-1 F-term in Nippon Telegraph and Telephone Corporation (reference) 5B035 AA11 BB09 CA23 5B058 CA17

Claims (20)

[Claims] 1. A means for receiving energy of an electromagnetic field radiated from an external device, an integrated circuit operable by driving power supplied by the energy of the electromagnetic field, and means for receiving the energy of the electromagnetic field And a switch for changing an inductance of the means. 2. The non-contact IC card according to claim 1, wherein the means for receiving the energy of the electromagnetic field is an electromagnetic induction coil. 3. The non-contact type IC card according to claim 1, wherein the means for receiving the energy of the electromagnetic field is a strip antenna. 4. The non-contact type IC card according to claim 1, wherein the means for receiving the energy of the electromagnetic field is a slot antenna. 5. The non-contact type IC card according to claim 1, wherein the means for receiving the energy of the electromagnetic field is a bowtie antenna. 6. The non-contact type IC according to claim 1, wherein the switch is connected in series to a means for receiving the energy of the electromagnetic field.
card. 7. The non-contact type IC according to claim 1, wherein the switch is connected in parallel to a unit for receiving the energy of the electromagnetic field.
card. 8. A non-contact type IC card comprising: means for receiving electromagnetic field energy radiated from an external device; an integrated circuit operable by driving power supplied by the electromagnetic field energy; A non-contact type IC card system comprising means for varying the inductance of the means by contacting a part of the means for receiving field energy. 9. The device according to claim 8, wherein the means for varying the inductance is formed of a conductive member, and is provided in a part of the means for receiving the energy of the electromagnetic field with the non-contact type IC card sandwiched therebetween. A card clip for short-circuiting at least two terminals provided. 10. The method according to claim 8, wherein the means for varying the inductance comprises the non-contact type I.
A card folder having a structure in which at least two terminals provided in a part of the means for receiving the electromagnetic field energy can be short-circuited in a state where the C card can be mounted and the non-contact type IC card is mounted. A non-contact type IC card system, characterized in that: 11. The non-contact type IC according to claim 10, wherein said card / folder includes means for communicating with said IC card.
Card system. 12. The non-contact IC card system according to claim 8, wherein the means for receiving the energy of the electromagnetic field is an electromagnetic induction coil. 13. The non-contact type IC card system according to claim 8, wherein the means for receiving the energy of the electromagnetic field is a strip antenna. 14. The non-contact type IC card system according to claim 8, wherein the means for receiving the energy of the electromagnetic field is a slot antenna. 15. The non-contact type IC card system according to claim 8, wherein the means for receiving the energy of the electromagnetic field is a bowtie antenna. 16. The non-contact type IC according to claim 8, wherein the switch is connected in series to a unit for receiving the energy of the electromagnetic field.
Card system. 17. The non-contact type IC according to claim 8, wherein the switch is connected in parallel to a means for receiving the energy of the electromagnetic field.
Card system. 18. A non-contact type IC card which is supplied with driving power by receiving the energy of an electromagnetic field radiated from an external device and enables information transmission with the external device. A non-contact type I comprising: means for receiving the energy of the generated electromagnetic field; an integrated circuit operable by the driving power; and a switch for switching between an operation prohibited state and an operable state of the integrated circuit.
C card. 19. A system using a non-contact type IC card which is supplied with driving power by receiving energy of an electromagnetic field radiated from an external device and enables information transmission to and from the external device, Means for receiving the energy of the electromagnetic field, an integrated circuit connected to the means for receiving the energy of the electromagnetic field and drivable by the driving power, and two terminals provided in a part of the means for receiving the energy of the electromagnetic field IC with
A non-contact IC card system comprising: a card; and a card clip formed of a conductive member and short-circuiting the two terminals by sandwiching the IC card. 20. A system using a non-contact type IC card which is supplied with driving power by receiving energy of an electromagnetic field radiated from an external device and enables information transmission with the external device, Means for receiving the energy of the electromagnetic field, an integrated circuit connected to the means for receiving the energy of the electromagnetic field and drivable by the driving power, and two terminals provided in a part of the means for receiving the energy of the electromagnetic field IC with
A non-contact type IC card comprising: a card; and a card folder having a conductive member capable of mounting the IC card and short-circuiting the two terminals when the IC card is mounted. system.