JP2003006592A - Information transceiver - Google Patents

Abstract

(57) [Problem] To transmit power and data between an external terminal device and a non-contact IC card with one antenna coil, it is necessary to bring the non-contact IC card close to the RWU,
There has been a problem that the power fluctuates due to a change in the direction of the non-contact IC card and noise enters data. An IC chip unit, antenna coils having different antenna lengths, and a secondary battery are provided. The secondary battery 27 is charged by electromagnetic waves transmitted from a portable device 38 such as a mobile phone. External terminal device 39
The data is exchanged with the secondary battery 27 using the power from the secondary battery 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information transmitting / receiving device such as a non-contact IC card and its system for exchanging data with an external terminal device by electromagnetic waves.

[0002]

2. Description of the Related Art There are two types of IC cards on which an IC chip is mounted: a contact type IC card and a non-contact type IC.
The non-contact IC card is transmitted from an external terminal device through electromagnetic waves,
It is a system that receives power as well as exchanges information, so it is easy to use and avoids inconveniences such as contamination and damage to the terminals of the IC chip, etc.
The demand is increasing rapidly.

In the non-contact IC card system, information is transmitted as an electromagnetic wave (frequency is 4.
There are two types, 91 MHz and 13.56 MHz, and the latter type is superposed on the mainstream), and exchanges information with external terminal devices.

That is, in order to transmit power and data from a RWU (read / write unit) which is an external terminal device to a non-contact IC card, the output of the oscillator of the RWU is amplitude-modulated or phase-modulated by a modulator and data is transmitted to a carrier wave. Put on. In the non-contact IC card, an alternating current is generated in the antenna coil by electromagnetic induction, and data (information) is taken out by the coupler from the alternating current. On the other hand, as the electric power, alternating current is converted into direct current by a rectifier and used as a driving power source for electronic circuits.

Data transmission from a non-contact IC card is
The signal is modulated by the modulator of the non-contact IC card, added to the antenna coil of the non-contact IC card by the coupler, superimposed on the carrier wave from the RWU (load modulation), and returned. It is received by the antenna coil of the RWU, separated by the combiner, demodulated by the demodulator of the RWU, and separated into carrier wave and data. As described above, in the conventional non-contact IC card system, both power transmission and data transmission are performed by electromagnetic induction between the RWU and the antenna coil of the non-contact IC card using one carrier. For example, JP-A-5-266269
No. Gazette, Japanese Patent Laid-Open No. 11-66260, CMC Issued "Non-contact IC Card Technology and Materials" pp. 177-185
Page (1998) etc.

[0006]

As described above, the conventional non-contact IC card has no built-in battery, and the RWU
Power and data are transmitted between the contactless IC card and the non-contact IC card by one antenna coil. Therefore, unless the contactless IC card is close to the RWU and power is generated by electromagnetic induction, data communication cannot be performed, and the contactless IC card is 10 cm.
It was necessary to approach the RWU until the following. In addition, the change in the orientation of the non-contact IC card changes the intensity of the electromagnetic induction current generated in the antenna coil, causing power fluctuation. For this reason, there is a problem in that the power and the strength of the data signal change at the time of reception, and the strength of the carrier wave on which the data is superimposed by the load modulation also fluctuates, causing noise.

On the other hand, microwave (2.45 GHz)
A type that can be separated up to a distance of several tens of meters by using z) was also examined, but since the generated power is inversely proportional to the square of the distance from the transmission source, an electromagnetic force is applied to the antenna coil at a distance of several tens of meters. To generate electric power by induction, it is necessary to transmit a strong electromagnetic wave from the RWU. This is difficult because it affects peripheral equipment. Therefore, a method of incorporating a secondary battery in the non-contact IC card and performing microwave communication with the power of the secondary battery has been devised. However, in this method, since the secondary battery consumes a large amount of power, it is often necessary to charge the battery using a dedicated charger, which is a problem that is difficult to use as a portable device.

Therefore, an object of the present invention is to provide an information transmitting / receiving apparatus which can extend the communication distance and reduce the influence of noise without requiring a special charger for charging the secondary battery. Is.

[0009]

In order to solve the above problems, an information transmitting / receiving apparatus such as a non-contact IC card according to the present invention has an electronic circuit section in which an IC chip is mounted and a plurality of antennas having different antenna lengths. Built-in coil and secondary battery. The secondary battery can be charged by receiving an electromagnetic wave transmitted from a mobile device such as a mobile phone with an antenna coil, generating electric power, rectifying the electric power, and converting the electric power into a direct current. Data is exchanged with the external terminal device (RWU) by using electric power from the secondary battery and an antenna coil suitable for transmission / reception with the RWU.

In the present invention, the above-mentioned antenna coil has a plurality of antenna lengths, one of which is for transmitting / receiving to / from the RWU, and at least one other than that is a mobile device (preferably a mobile phone). ) Has an antenna length corresponding to the frequency. At this time, a type in which an antenna coil having a plurality of antenna lengths is formed in advance and R
In addition to the antenna coil for transmitting and receiving with the WU, it is composed of one charging antenna coil, and there is an opening / closing switch in the middle of this charging antenna coil, and if necessary, this opening / closing switch is opened / closed. A type in which the antenna length of the antenna coil can be changed is possible. RWU
As an antenna coil used for transmitting and receiving data to and from the antenna coil, an antenna coil having an winding number of 10 to 20 or more times (an antenna length of about 4 m to 6 m) is usually used because electromagnetic induction is used. To be

As a charging method, a charging method in which an electromagnetic wave is emitted from a portable device, an alternating current is generated in the antenna coil by utilizing the electromagnetic wave, and this current is converted into a direct current to charge a secondary battery is effective. is there. In this method, it is necessary to set the antenna length according to the transmission frequency (wavelength) of the mobile device. 0.8 if the mobile device is a mobile phone
GHz and 1.4 GHz are used, and W-CDMA uses 1.
Frequencies between 9 GHz and 2.1 GHz are used. Therefore, depending on the cell phone of the user of the non-contact IC card, the antenna lengths are 37.5 cm and 21.
It is necessary to use either 4 cm or 15 cm. It suffices if only the antenna coil corresponding to the wavelength of the mobile phone of the non-contact IC card user is provided in advance in the non-contact IC card, but it is not known which type of mobile phone is owned. It must be built in the non-contact IC card.

Further, the information transmitting / receiving device such as the non-contact IC card of the present invention has a display section for indicating the charge state of the secondary battery, and senses the charge state of the secondary battery and the state of charge of the battery, Convenience is greatly improved by having a function of optically or / and acoustically issuing an alarm signal when the full charge and the remaining capacity fall below a certain threshold.

The secondary battery used here is preferably a high-capacity type secondary battery such as a Li-ion battery or a nickel-hydrogen battery, but a Li-polymer battery or an all-solid electrolyte using a gel polymer or an inorganic solid electrolyte as an electrolyte. Electrolyte batteries, as well as proton polymer batteries, lead acid batteries and nicad batteries, which have excellent output characteristics, can be used.

Further, the IC chip is composed of a CPU and a memory chip, and a non-volatile flash memory or an EEPROM is used as the memory chip, but a ferroelectric type such as FeRAM with a driving voltage of 3V and low power consumption. The use of memory is preferred. In this case, a lithium-based battery such as a lithium-ion battery having an average voltage of about 3.6 V has good voltage conversion efficiency and is suitable.

Further, an amplifier is built in the electronic circuit to correct the output when transmitting data to the external terminal device.

In the information transmitting / receiving apparatus configured as described above, the electromagnetic wave transmitted from the portable device is received by the antenna coil and the built-in secondary battery is charged, so that the charging problem at the time of carrying can be solved. R using the power of the secondary battery
Since information is transmitted to and received from the WU, a communication distance becomes long, and an information transmitting / receiving device such as a non-contact IC card with less noise due to voltage fluctuation can be obtained.

The present invention is an information transmitting / receiving apparatus, which is a contactless I
It is not limited to C cards, but is a non-contact type device that exchanges information with external terminals (for example,
Item tags, file tags, smart cards, Java
(Registered trademark) card, etc., the present invention can be used. In addition to charging the mobile device carried by the owner of the non-contact IC card, it is also possible to use an electromagnetic wave transmitted from the RWU or a mobile device owned by another person for charging, and it is possible to use the electromagnetic waves together.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, preferred embodiments of an information transmitting / receiving apparatus according to the present invention, for example, a non-contact IC card will be described in detail.

The contactless IC card of the present invention basically comprises a communication antenna coil for receiving and transmitting data with an external terminal and a peripheral electronic circuit including an IC chip for processing and storing this data signal. It is composed of a charging antenna coil for receiving an electromagnetic wave from a secondary battery and a mobile device such as a mobile phone and charging the secondary battery. However, the frequencies of mobile phones are currently 0.8 GHz and 1.4 GHz in Japan.
Hz is used, and in W-CDMA, 1.9 GHz to 2.1.
A frequency of GHz is used. Therefore, as the antenna length for receiving the electromagnetic waves transmitted from the mobile phone,
It is preferable to match the length of either wavelength.
An electromagnetic wave from a mobile phone is received by a charging antenna coil in a non-contact IC card, an alternating current is generated, and further converted into a direct current, which is used as a charging current to charge a secondary battery. Preliminarily form a plurality of antenna coils having an antenna length (excluding communication antenna coils for exchanging information with external terminals) suitable for the transmission wavelength of the mobile device, or use one antenna coil for each frequency The electromagnetic wave emitted from the portable device can be efficiently received by using the one that can correspond to the wavelength.

In the latter case, the occupation area for the antenna coil can be small, but on the other hand, in order to optimize the antenna length, the highest output power among the electric power generated in the antenna coil is automatically selected, or It is necessary to select the optimum antenna length by key input.

Generally, in a non-contact IC card, data is transmitted / received by placing the data on a carrier wave from the RWU side. That is, the information from the RWU side is placed on a carrier wave to transmit data to the non-contact IC card, and the non-contact IC card side load-modulates the data to superimpose the data on the carrier wave to transmit the data to the RWU ( I'm replying. However, due to a change in the direction of the non-contact IC card, the amplitude of the carrier wave at the time of transmission and reception changes, which causes a change in electromotive force and a mistake in reading information. Non-contact I of the present invention
In the C card, when the carrier wave from the RWU is detected by the built-in secondary battery, the power is turned on, data can be extracted and the response by the IC chip can be made, so the communication distance becomes longer and the carrier wave amplitude fluctuations. In contrast, a more stable communication is achieved by passing it through an amplifier, stabilizing it, and returning it to the RWU. In the range of several tens of meters,
It is possible to communicate by incorporating an oscillator and an amplifier in the non-contact IC card for a short time.

The secondary battery used here is preferably a high capacity type secondary battery such as a Li-ion battery or a nickel hydrogen battery. A Li polymer battery using a gel polymer or an inorganic solid electrolyte as an electrolyte, an all solid electrolyte battery, a lead storage battery or a NiCd battery can also be used.

Further, a function of sensing the state of charge of the secondary battery and the state of charge of the battery and optically or / and acoustically issuing an alarm signal when full charge and when the remaining amount of charge falls below a certain threshold value. It is preferable to have.

The IC chip is composed of a CPU for arithmetic processing and a memory section for storage processing. As the memory, a non-volatile flash memory or EEPROM is used, but it is a FeRAM with a driving voltage of 3 V and low power consumption. The use of various ferroelectric memories is preferred. In this case, a combination with a lithium-based battery such as a lithium-ion battery having an average voltage of about 3.6 V has good voltage conversion efficiency and is suitable.

The present invention is not limited to a non-contact IC card such as a commuter pass, but a smart card or a Java (registered trademark) card having a higher information processing function is turned off during calculation or storage processing. Therefore, the risk of data corruption can be avoided, and the use of the present invention is very effective.

[0026]

Embodiment 1 (Embodiment 1) A specific embodiment of the non-contact IC card of the present invention will be described below. FIG. 1 is a schematic configuration diagram of a non-contact IC card system according to the first embodiment, and FIG. 2 is a schematic configuration diagram of a non-contact IC card according to the first embodiment. In FIG. 2, 21 is a thin rectangular parallelepiped card substrate, 21a is its cover material, 22 is a communication antenna coil, 23 and 24 are charging antenna coils, and 25 is a built-in IC chip for calculating and storing information. IC chip part which is an electronic circuit part, electric circuit parts such as a modulator, a demodulator, an AC-DC converter (rectifier) and a charging control circuit, a secondary battery 27, and a display for displaying a charging state. An element, 29 is a piezoelectric speaker, 38 is a mobile device such as a mobile phone, and 39 is an RWU.

A carbon ink was printed on a card substrate 21 of 54 mm × 85 mm by screen printing in a predetermined antenna shape pattern, and then 30 μm electrolytic copper plating was performed thereon. The outer coil end is pulled out to the inside by coating with a UV curable resin, and the resin is cured by UV irradiation, then the coil end is pulled out in the same manner as above with a two-layer structure of a carbon layer and a copper layer. A wire is formed, and the antenna coil 22 for communication (15 turns), the antenna coil 23 for charging (coil length 37.5 cm) and 24 (coil length 21.4).
cm) formed. By plating copper on carbon, the adhesion to the base was good, it did not come off even when the substrate was bent, and the electrical resistance was low.

The information signal transmitted from the antenna coil on the RWU 39 side is received by the communication antenna coil 22 of the non-contact IC card, and a current is generated in the coil by electromagnetic induction. Information is extracted from this current by the demodulator,
FeR which is a CPU and a ferroelectric memory for arithmetic processing
Information processing is performed by the IC chip unit 25 composed of AM. When transmitting (returning) information, the information signal processed by the IC chip unit 25 is modulated by the modulator, superimposed on the carrier wave transmitted from the RWU 39 (load fluctuation), and the antenna coil 22
Sent (replied) to RWU39.

The alternating current generated in the communication antenna coil 22 during communication with the RWU 39 is also converted into direct current by the AC-DC converter, and the paper type lithium ion secondary battery 2
Used to charge 7. However, for information processing and transmission of information,
This was performed using the power of the secondary battery 27.

Conventionally, since only the current generated by electromagnetic induction was directly used as the power source, the communicable distance of the signal was short, and the signal became a noise with a voltage fluctuation, resulting in malfunction. In the case of the present embodiment, the power is once supplied to the secondary battery 27.
The communication distance is long because the signal is stored in the RWU 39 and the signal is put into the reception operation when the signal from the RWU 39 is received.

Further, since the strength of the carrier wave at the time of transmission / reception fluctuates due to the change of the direction of the non-contact IC card,
This causes fluctuations in electromotive voltage and erroneous reading of information. Furthermore, by the built-in secondary battery 27 when replying,
The accuracy of information transmission was further improved by correcting the output of the carrier wave.

For charging, an electromagnetic wave transmitted from a mobile device 38 such as a mobile phone is received by the antenna coil 23 or 24, the generated electric power (AC) is converted to DC by an AC-DC converter, and the DC current is used. Charged.

The end-of-charge voltage was 4.1 V, and at the end of charging, the display element 28 displayed a message indicating the completion of charging and the piezoelectric speaker 29 notified the completion of charging.

On the other hand, the remaining capacity is displayed on the display element 28 in accordance with the battery voltage, and when the voltage drops to 3.3 V, the piezoelectric speaker notifies that the remaining battery power is low.

The secondary battery 27 can be easily charged by charging the electric power from the electromagnetic waves transmitted from the portable device as in this embodiment. Also during communication with the RWU 39, power is supplied from the communication antenna coil 22 to be charged.
Also, charging can be performed from electromagnetic waves transmitted from another person's portable device in the vicinity.

Further, the contactless communication with the RWU 39 is less frequently used, and the power consumption is sufficiently smaller than the battery capacity, and it can be used even for the charging using the minute current extracted from the electromagnetic wave transmitted from the portable device. There was no problem. Note that connecting a capacitor in parallel with the secondary battery 27 is effective because a large current can be taken out during transmission.

It is desirable that the antenna length corresponds to the frequency used by the mobile device. For the mobile phone, in addition to the 21.4 cm and 37.5 cm of this embodiment, W-CDMA is used.
Correspondingly, it is also effective to incorporate an antenna length of 15 cm.

Since the intensity of electromagnetic waves is inversely proportional to the square of the distance, the antenna coil 2 of the non-contact IC card is charged during charging.
From the viewpoint of efficiency, it is desirable that the distance between the antennas 3 and 24 and the antenna of the mobile device 38 be as short as possible.

(Embodiment 2) In FIG. 3, in the present embodiment 2,
The schematic block diagram of a non-contact IC card is shown. 30 is a charging antenna coil, 31, 31 ', 32, 32' are opening / closing switches, 33 is an antenna coil for communication with the RWU, 34
Is a key input unit, and 35 is a secondary battery using a lithium polymer battery.

Similar to the first embodiment, a two-layer type conductive wire is produced by the printing method and the electrolytic plating method, the overlapping portion is coated with resin in advance and the conductive wire portion is formed, and the antenna coil 33 for communication with the RWU is formed. A charging antenna coil 30 was produced. The charging antenna coil 30 has a total length of 37.5 cm.
With the antenna coil of, the open / close switches 31, 31 ', 3 made up of semiconductor elements at positions 21.4 cm and 15 cm on the way.
2, 32 'were inserted and the part was connected to the AC-DC converter. This open / close switch 31, 31 ', 3
2, 32 'have a structure in which the switch is opened and closed by an input signal from the key input unit 34 on the surface of the non-contact IC card, and the antenna length is changed. The other parts were configured in the same manner as in Example 1.

If the electromagnetic wave emitted from the mobile phone placed near the non-contact IC card has a frequency of 2 GHz and a wavelength of 15 cm, the key input unit 34 outputs a wavelength of 15 c.
Select and enter m. As a result, the open / close switch 31 is turned on (connected) and 31 'is turned off (disconnected), and the antenna coil 3 for charging has an antenna length of 15 cm.
Formed 0.

When the electromagnetic wave transmitted from the mobile phone has a frequency of 1.4 GHz and a wavelength of 21.4 cm, the opening / closing switch 31 is OFF (disconnect), 31 'is ON (connection),
32 is in an ON (connection) state and 32 'is in an OFF (disconnection) state, and an electromagnetic wave emitted has a frequency of 0.8 GHz and a wavelength of 3
If the distance is 7.5 cm, the open / close switch 31 is turned off.
(Disconnect), 31 'is ON (connect), 32 is OFF (disconnect), and 32' is ON (connect). In the normal state, the antenna length was 21.4 cm.

Other electric circuits, charging control, etc. were constructed in the same manner as in the first embodiment. As the secondary battery, a lithium polymer battery 35 using a polymer gel electrolyte resistant to bending was used.
This embodiment has an advantage that a plurality of coils can be stored in a limited space.

Even during communication with the RWU, power is supplied from the communication antenna coil 33 to charge it. Also,
Charging is possible if the frequency is the same from the electromagnetic waves from another person's mobile device transmitted in the vicinity. Conventionally, in a non-contact type IC card with a built-in secondary battery, it has been necessary to charge it close to an electromagnetic induction type charging device, and it cannot be used when the capacity of the secondary battery is exhausted while being carried.

(Third Embodiment) FIG. 4 shows a schematic configuration diagram of a non-contact IC card system according to the third embodiment. Non-contact I
The C card has a structure in which a transmission amplifier 37 is added to that of the first embodiment.

In the same manner as in Example 1, a varnish-coated copper wire was wound around the card base material 20 times to form a communication antenna coil 22. The charging antenna coil is the same as that of the first embodiment, and the antenna length is 37.5 cm,
21.4 cm and 15 cm coils were made.

In addition, the transmission amplifier 37 is introduced in the communication antenna coil output section in order to correct the output during load modulation. Other electric circuits, charging control, etc. were configured in the same manner as in the first embodiment. As the secondary battery 27, a proton polymer battery (a positive electrode indole polymer, a negative electrode quinoxaline, an electrolyte is an acidic aqueous solution gel) having excellent output characteristics was used.

In the non-contact IC card of the third embodiment, the electromagnetic waves received from the portable device 38 are charged in the secondary battery 27 by the charging antenna coil similar to that of the first embodiment, and this power is used for I
When the intensity of the transmission wave from the RWU 39 decreases while driving the C-chip unit 25, the power of the secondary battery 27 is used to increase the intensity of the carrier wave by the amplifier 37 and the communication antenna coil 22 causes the RWU 39 to reach the RWU 39. sent. As a result, it is possible to largely prevent the reading malfunction due to the directionality of the non-contact IC card.

(Embodiment 4) As in Embodiment 2, a two-layer type conductive wire is prepared by a printing method and an electrolytic plating method, and in order to prevent a short circuit at an overlapping portion, a conductive wire portion is formed on the resin in advance in order to prevent a short circuit. , The antenna coil 33 for communication with the RWU 39 and the antenna coil 30 for charging were manufactured. Further Example 2
Similarly, a semiconductor element, which is an opening / closing switch, was installed at a predetermined position of the charging antenna coil 30. The antenna coil for charging is an antenna coil having a total length of 37.5 cm, and opening / closing switches 31, 31 ′, 32, 32 ′ are inserted at positions 21.4 cm and 15 cm on the way, and from that portion, as in the second embodiment. It was connected to an AC-DC converter. As an initial state, the antenna length was set to 21.4 cm.

In this embodiment, when a current exceeding a certain threshold value is generated in the antenna coil, the opening / closing switches are sequentially opened and closed, and the antenna lengths are 37.5 cm, 21.4 cm, 15
The antenna coil with the largest generated current is automatically selected, and the switch for opening and closing is fixed. When the generated current drops below the threshold value, open and close the opening and closing switches again in sequence.If there is a current larger than the threshold value, fix it to the largest antenna coil among them, and if it does not exceed the threshold value, set the antenna length. 21.4 cm
The system is terminated in the state of.

Other electric circuits, charging control, etc. were constructed in the same manner as in the second embodiment. As a secondary battery, LiCo is used for the positive electrode.
An all-solid-state lithium secondary battery using O ₂ , TiSn alloy for the negative electrode and LiPON for the electrolyte was used.

Similar to the second embodiment, when communicating with the RWU,
Electric power is supplied from the communication antenna coil to be charged.

In the fourth embodiment, since the open / close switch is automatically switched and the optimum charging antenna coil is set, the load on the user is greatly reduced.

As described above, by incorporating the secondary battery in the non-contact IC card, the function of the non-contact IC card does not operate unless the password is entered, and the security of the card can be greatly improved. Other than key input, other authentication means such as fingerprint collation can be realized by incorporating a secondary battery.

Further, by incorporating a secondary battery, the RWU
Information after communication with (such as withdrawal amount information and balance information) can be displayed on the display element. conventionally,
It was necessary to insert the contactless IC card into the external terminal for displaying the contents for confirmation, but the convenience is greatly improved by incorporating the battery.

Conventionally, there has been a non-contact IC card having a built-in secondary battery, but the charging of the secondary battery is limited to a specific external terminal device, and there is a problem that it is not suitable for actual use.

As described above, according to the present invention, the secondary battery (power source) can be built in the non-contact IC card by charging the secondary battery using the electromagnetic wave transmitted from the portable device. It has become possible to construct a non-contact IC card system with a long communication distance and little influence of noise.

[0058]

According to the information transmitting / receiving device of the first aspect, the secondary battery is built by incorporating the IC chip, the antenna coil for receiving the electromagnetic wave transmitted from the portable device such as the portable telephone, and the secondary battery. Eliminates the need for a special charger to charge By operating the IC chip and the electric circuit components with the power of the secondary battery, a non-contact IC card system or the like having a long communication distance and little influence of noise can be constructed. In addition, by incorporating a battery in a non-contact IC card or the like, it is possible to prevent data destruction due to power-off during processing, and it is also possible to add a new function such as a security system or balance display. Since it has a plurality of antenna coils, it can support a plurality of types of mobile devices.

According to the information transmitting / receiving apparatus of the second aspect,
In addition to the same effect as the first aspect, the number of antennas can be reduced. Operability is good if the open / close switch is automatically switched.

According to the information transmitting / receiving apparatus of the third and fourth aspects, the same effect as that of the first aspect can be obtained.

According to the information transmitting / receiving apparatus of the fifth aspect,
In addition to the same effect as in claim 1, it is possible to know whether or not the need for charging approaches.

According to the information transmitting / receiving apparatus of the sixth aspect,
In addition to the same effect as in claim 1, the charging time can be immediately found.

According to the information transmission / reception apparatus of claim 7,
In addition to the same effect as in claim 1, it is possible to know the end of charging.

According to the information transmission / reception device of claim 8,
It has the same effect as the first aspect.

According to the information transmitting / receiving apparatus of the ninth aspect,
In addition to the effect similar to that of claim 1, charging can also be performed by electromagnetic waves from an external terminal device.

According to the information transmitting / receiving device of the tenth aspect, in addition to the same effect as the first aspect, stable communication can be performed.
It is possible to prevent the reading malfunction due to the directionality.

According to the information transmitting / receiving apparatus of the eleventh aspect, the same effect as that of the fourth, eighth or ninth aspect can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a non-contact IC card system according to a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a non-contact IC card according to the first embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a non-contact IC card according to a second embodiment of the present invention.

FIG. 4 is a schematic diagram of a non-contact IC card system according to a third embodiment of the present invention.

[Explanation of symbols]

21 Card base material 22 Communication antenna coil 23, 24 antenna coil for charging 25 IC chip section 26 Electric circuit components 27 secondary battery 28 Display element 29 Piezoelectric speaker 30 antenna coil for charging 31, 31 'Open / close switch 32, 32 'open / close switch 33 Communication antenna coil 34 Key input section 35 Lithium polymer battery 38 Mobile devices 39 External terminal unit (RWU)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H01Q 7/00 H04B 5/02 H04B 5/02 G06K 19/00 HNF Term (reference) 2C005 MA22 MB07 NA08 NA09 QA05 5B035 AA11 BA05 BB09 BC00 CA12 CA31 5J047 AA00 AB11 FC06 5K012 AA01 AB05 AB12 AC06 AE13 BA02

Claims (11)

[Claims] 1. An electronic circuit unit on which an IC chip is mounted,
An information transmitting / receiving apparatus comprising an antenna coil and a secondary battery connected to the electronic circuit section, wherein the antenna coil is composed of a plurality of antenna coils having different antenna lengths. 2. The antenna length according to claim 1, wherein at least one opening / closing switch is provided in the middle of one antenna coil, and the antenna length of the antenna coil is changed by opening / closing the opening / closing switch as needed. Information transmitter and receiver. 3. The information transmitting / receiving device according to claim 1, wherein one of the antenna coils transmits / receives data to / from an external terminal device. 4. At least one of the antenna coils has an antenna length synchronized with an electromagnetic wave transmitted from a portable device, and has means for generating electric power from the electromagnetic wave and supplying the secondary battery with electric power to charge the secondary battery. 1. The information transmission / reception device according to 1. 5. The information transmission / reception device according to claim 1, further comprising a display unit for indicating a charge state of the secondary battery. 6. A means for detecting a state of charge of a battery, which is optically or / and / or
The information transmitting / receiving apparatus according to claim 1, further comprising means for audibly issuing an alarm signal. 7. The information transmitting / receiving apparatus according to claim 1, further comprising means for optically or / and audibly issuing an alarm signal when the fully charged state of the battery is sensed. 8. An electronic circuit unit on which an IC chip is mounted,
An antenna coil and a secondary battery connected to the electronic circuit section and an electromagnetic wave transmitted from a mobile device are received by the antenna coil, an alternating current is generated, and the alternating current is converted into a direct current to supply power to the secondary battery. And a means for charging the information processing apparatus, wherein the electronic circuit is operated by the electric power stored in the secondary battery. 9. An electronic circuit unit on which an IC chip is mounted,
An antenna coil and a secondary battery connected to this electronic circuit section, a circuit for charging the secondary battery with an electromagnetic wave from a mobile device, and an electromagnetic wave transmitted from an external terminal device are received by the antenna coil and exchanged. A circuit for generating a current, converting this alternating current into a direct current, supplying electric power to the secondary battery to perform charging, and operating an electronic circuit with the electric power stored in the secondary battery. Information transmitter and receiver. 10. The information transmitting / receiving apparatus according to claim 8 or 9, wherein an amplifier is built in the electronic circuit, and output correction is performed when data is transmitted to an external terminal device. 11. An information transmission / reception device, wherein the mobile device according to claim 4, 8, or 9 is a mobile phone.