JP2000090215A - Reader and writer device and non-contact IC card system - Google Patents

Abstract

(57) [Summary] [Object] To reduce the intensity of an electromagnetic field far from a device generated by an antenna of a reader / writer. The present invention relates to a reader / writer device (1) for transmitting power to an IC card (2) in a non-contact manner and transmitting and receiving communication to and from the IC card (2) in a non-contact manner. A plurality of antennas 31 arranged in an array, and card detection means 32 for detecting information where the IC card is located in the vicinity of the plurality of antennas;
Means 33 for selecting an antenna for transmitting power to the IC card based on the position information of the IC card detected by the card detection means, and transmitting power to the IC card 2 from an antenna near the IC card 2 As a result, the electromagnetic field strength at a distant place of the device is reduced, and a wide communication area is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reader / writer device and a non-contact IC card system for transmitting and receiving electric power and communicating with an IC card in a non-contact manner.

[0002]

2. Description of the Related Art FIG. 8 shows an example of a conventional contactless IC card system. In FIG. 8, 1 is a reader / writer,
2 is an IC card, 11 is an OSC (oscillator), 12 is a data processing circuit, 13 is a modulation circuit, 14 is a gain control circuit, 15 is a driver circuit, 16 is an antenna, 17 is a demodulation circuit, 18 is an amplifier, and 19 is k. A detection circuit, 21 is an antenna, 22 is a demodulation circuit, 23 is a data processing circuit, 24
Is a modulation circuit. A carrier wave for power transmission output from the OSC 11 and a signal for communication transmission from the data processing circuit 12 are superimposed and modulated by a modulation circuit 13, and an output required for communication with the IC card 2 is gained by a gain control circuit 14. The gain is adjusted, amplified by the driver circuit 15, and transmitted to the IC card 2 via the antenna 16. When the IC card 2 receives a signal for power transmission and a signal for communication transmission from the reader / writer 1 by the antenna 21, the signal for power transmission is rectified in the rectifier circuit 25, and a desired DC The signal is converted into a voltage and supplied to a data processing circuit 23 including a CPU and the like. A signal for communication transmission is demodulated and input by a demodulation circuit 22, and the data processing circuit 23 performs data processing. The signal output from the data processing circuit 23 is modulated by the modulation circuit 24 and transmitted to the antenna 16 of the reader / writer 1 via the antenna 21. When the reader / writer 1 receives a communication signal from the IC card 2 with the antenna 16, the reader / writer 1 demodulates the signal with the demodulation circuit 17 and performs data processing with the data processing circuit 12. Further, the reader / writer 1 amplifies the signal received from the IC card 2 by the antenna 16 by the amplifier 18 and outputs the amplified signal to the k detection circuit 19. k
The detection circuit 19 detects the antenna coupling coefficient k between the reader / writer 1 and the IC card 2 from the amplitude of the signal input from the amplifier 18 and outputs the same to the gain control circuit 14. The gain control circuit 14 includes a k detection circuit 19
The output gain of the reader / writer 1 is adjusted so as to be proportional to the reciprocal of the antenna coupling coefficient k received from. This type of non-contact IC card system is known, for example, from Japanese Patent Application Laid-Open No. 8-191259.

[0003]

SUMMARY OF THE INVENTION The above-mentioned non-contact I
In the C card system, for example, in the case of a use form in which the IC card 2 communicates with the reader / writer 1 while moving, such as an automatic ticket gate, a wide communicable area is required. For this reason, the antenna 16 of the reader / writer 1 is larger than the size of the antenna 21 of the IC card 2 to secure a wide communication area. As described above, when the antenna 16 of the reader / writer 1 is enlarged,
The distant electromagnetic field strength increases in proportion to the area of the antenna 16. Therefore, in order to conform to the rules of the distant electromagnetic field strength according to the Radio Law and the like, it is necessary to provide a shield outside the antenna 16 for weakening the distant electromagnetic field strength, resulting in an increase in cost. In addition, when the size of the antenna 16 of the reader / writer 1 is increased, the coupling coefficient with the antenna 21 of the IC card 2 is reduced, and the output power must be increased in order to supply power for operating the IC card 2. However, this also increased the distant electromagnetic field.

[0004] An object of the present invention is to solve the above problems.
A reader / writer device and a non-contact I, which are capable of sufficiently supplying power for operating an IC card by electromagnetic waves by suppressing the strength of a distant electromagnetic field generated from the reader / writer device.
It is to provide a C card system.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for transmitting electric power to an IC card in a non-contact manner.
A reader / writer that sends and receives communications with a C card without contact
A writer device, a plurality of antennas arranged in an array for transmitting power to the IC card, card detection means for detecting information where the IC card is located in the vicinity of the plurality of antennas, Means for selecting an antenna for transmitting power to the IC card based on the position information of the IC card detected by the card detection means. The present invention also relates to a reader / writer device for transmitting and receiving electric power to and from an IC card in a non-contact manner, wherein the reader / writer device is arranged in an array for transmitting electric power to the IC card. A plurality of antennas arranged, card detection means for detecting information on the IC card located near the plurality of antennas, and a possibility that the IC card will move from the position of the IC card detected by the card detection means IC card movement range estimating means for estimating a certain moving range, and an IC card based on the IC card position information detected by the card detecting means and the movement range predicted by the IC card moving range estimating means. Means for selecting an antenna for performing power transmission.

The present invention also relates to a reader / writer device for transmitting power to an IC card in a non-contact manner and transmitting and receiving communication to and from the IC card in a non-contact manner. A plurality of antennas arranged in an array for transmitting and receiving communications between the plurality of antennas; card detection means for detecting information on the IC card located in the vicinity of the plurality of antennas; Means for selecting an antenna for transmitting and receiving power to and from the IC card based on the positional information of the IC card. In addition, the present invention relates to I
A reader / writer device for transmitting power to a C card and transmitting and receiving communication to and from an IC card in a non-contact manner, for transmitting power to the IC card and transmitting and receiving communication to and from the IC card. And a plurality of antennas arranged in an array of
Card detection means for detecting information in which the C card is located;
I from the position of the IC card detected by the card detection means
I for predicting the moving range where the C card may move
C card movement range estimating means, and based on the IC card position information detected by the card detection means and the movement range predicted by the IC card movement range estimating means, transmit and receive power and communication to and from the IC card. Means for selecting an antenna to be performed.

The present invention also provides the reader / writer device, further comprising: a filter for extracting a signal received by a highly sensitive antenna among the plurality of antennas; and a demodulator for demodulating the signal extracted by the filter. And demodulation means for converting the data into reception data. Also,
The present invention is characterized in that in the reader / writer device, the information on the location of the IC card detected by the card detection means is information on an antenna on which the IC card is located. Also, the present invention is characterized in that in the reader / writer device, the card detection means is configured to detect information on the location of the IC card by comparing a voltage or a current generated in an adjacent antenna. . Further, according to the present invention, in the reader / writer device, the card detection means may be configured to detect a wave source that generates an ultrasonic wave corresponding to the antenna and a phase difference between a signal input by the ultrasonic wave generated by the wave source. And detecting means for detecting information on the location of the IC card. Further, according to the present invention, in the reader / writer device, the card detecting means includes: a light emitting source that emits light corresponding to the antenna;
Light receiving means for detecting information on the position of the IC card by receiving light on whether or not the IC card is blocked.

The present invention is also a non-contact IC card system for performing non-contact communication between a reader / writer and an IC card, wherein the reader / writer transmits power to the IC card. A plurality of antennas arranged in an array, and the IC near the plurality of antennas
Card detection means for detecting information on the position of the card, and means for selecting an antenna for transmitting power to the IC card based on the position information of the IC card detected by the card detection means. . The present invention is also a non-contact IC card system for performing non-contact communication between a reader / writer and an IC card, wherein the reader / writer has an array form for transmitting power to the IC card. , A plurality of antennas, card detection means for detecting information on the position of the IC card near the plurality of antennas, and an IC detected by the card detection means.
IC card movement range prediction means for predicting a movement range in which the IC card may move from the position of the card, position information of the IC card detected by the card detection means and prediction by the IC card movement range prediction means. Means for selecting an antenna for transmitting power to the IC card based on the moving range.

The present invention is also a non-contact IC card system for performing non-contact communication between a reader / writer and an IC card, wherein the reader / writer has a power transmission to the IC card and an IC card. A plurality of antennas arranged in an array for transmitting and receiving communications between the plurality of antennas; card detection means for detecting information on the IC card located in the vicinity of the plurality of antennas; Means for selecting an antenna for transmitting power and transmitting / receiving communication to / from the IC card based on the obtained positional information of the IC card. Also, the present invention is a non-contact IC card system for performing non-contact communication between a reader / writer and an IC card, wherein the reader / writer has a power transmission to the IC card and a communication between the reader / writer and the IC card. A plurality of antennas arranged in an array for transmitting and receiving communications, card detection means for detecting information where the IC card is located near the plurality of antennas, and an IC detected by the card detection means IC card movement range prediction means for predicting a movement range in which the IC card may move from the position of the card, position information of the IC card detected by the card detection means and prediction by the IC card movement range prediction means. Means for selecting an antenna for transmitting and receiving power to and from the IC card based on the moving range.

[0010] Further, according to the present invention, in the contactless IC card system, the reader / writer further includes: filter means for extracting a signal received by a high-sensitivity antenna among the plurality of antennas; Demodulating means for demodulating the signal extracted by the means and converting the signal into received data. As described above, according to the above configuration, the antenna size of the reader / writer can be made closer to the IC card, and as shown in FIG.
Efficient power transmission from the reader / writer to the IC card can be performed. As a result, it is possible to suppress and satisfy the distant electromagnetic field strength prescribed by the Radio Law and realize a wide communication area. can do.

[0011]

Embodiments according to the present invention will be described with reference to the drawings. First, a first embodiment according to the present invention will be described with reference to FIGS. FIG.
1 is a schematic configuration diagram showing a first embodiment of a contactless IC card system according to the present invention. FIG. 2 is a diagram showing an arrangement of antennas installed in the reader / writer device and an antenna for transmitting and receiving to and from the IC card.

As shown in FIG. 2, the reader / writer 1 has
Many (eg, 4 × 4, 16) antennas (coils) 3
1 was reduced to the same size as the antenna (coil) 21 of the IC card 2 and arranged in an array (matrix). FIG. 2 shows that the antennas 31 a and 31 b are located near the IC card 2 and perform transmission and reception with the IC card 2. The configuration of the IC card 2 is as follows.
For example, it is configured as shown in FIG. That is, IC
When the card 2 receives the signal for power transmission and the signal for communication transmission from the reader / writer 1 by the antenna 21, the signal for power transmission is rectified by the rectifier circuit 25, and the desired DC voltage is supplied by the power supply circuit 26. Convert to C
The data is supplied to a data processing circuit 23 composed of a PU or the like, and a signal for communication transmission is demodulated by a demodulation circuit 22 and input.
The data processing circuit 23 performs data processing. The signal output from the data processing circuit 23 is modulated by the modulation circuit 24 and transmitted to the antenna 16 of the reader / writer 1 via the antenna 21.

Further, as shown in FIG. 1, a reader / writer 1 for supplying electric power to the
An OSC (oscillator) 11 that oscillates a signal having a frequency of 3.56 MHz, and a data processing circuit 12 that processes (including control) data to be transmitted and received between the IC card 2
A modulation circuit 13 for modulating a power transmission frequency signal obtained from the OSC 11 and a coded signal for transmitting data to the IC card; and detecting a change in impedance from, for example, each antenna 31 arranged in an array. A card detection circuit 32 for detecting the presence of the IC card 2 in the vicinity, and a modulation signal obtained from the modulation circuit 13 for the antenna 31 in the vicinity of the IC card 2 detected by the card detection circuit 32 Distribution circuit 3 for distribution
3, a driver circuit 15 provided corresponding to each antenna 31 so as to amplify the modulated signal distributed from the distribution circuit 33, and a filter circuit for supplying only the received signal from the antenna 31 to the demodulation circuit 17. And a demodulation circuit 17 for demodulating a signal obtained from the filter circuit 34 and providing the demodulated signal to the data processing circuit 12 as data. The output of the driver circuit 15 is connected to a series resonance circuit configured by connecting the capacitor 37 and the antenna 31 in series. In particular, the reader / writer device 1
, A large number (for example, 16) of antennas 31 are arranged in, for example, a 4 × 4 array (matrix), and the antenna 31 in which the IC card 2 is present in the vicinity is detected and notified to the distribution circuit 33 A circuit 32, a distribution circuit 33 that supplies a signal to the antenna 31 that transmits to the IC card 2, and a filter circuit 34 that supplies only the received signal from the antenna 31 to the demodulation circuit 17 are provided.

The operation of the first embodiment will be described below. A carrier wave output from the OSC 11 is modulated by a modulation circuit 13 by a signal from a data processing circuit 12, and distributed by a distribution circuit 33 to a driver circuit 15 connected to an antenna 31 that communicates with the IC card 2. The signal is amplified by the circuit 15 and transmitted to the IC card 2 via the antenna 16. At this time, the distribution circuit 33 outputs a signal only to the antenna 31 determined by the card detection circuit 32 to detect the card and to the antenna 31 in the vicinity thereof. That is, when the size of the antenna 31 is substantially the same as the size of the antenna 21 of the IC card 2, the IC card 2 may be located between the adjacent antennas 31 as shown in FIG.
Therefore, it is necessary to distribute the modulation signal (power and transmission data) obtained from the modulation circuit 13 also to an antenna close to the antenna detected by the card detection circuit 32. As described above, even if the antennas are distributed to the close antennas at the same time, since the power supply per one antenna is small and the antenna gain for the far field is low, the small antenna 31 is used.
It is possible to reduce the electromagnetic field strength far from the apparatus while securing a wide communication area.

Further, the filter circuit 34 includes the IC card 2
From the transmitting antenna 31 and supply it to the demodulation circuit 17. In addition,
If it is necessary to amplify the received signal, this amplifying circuit is inserted at an appropriate position before or after the filter circuit 34. When the plurality of antennas 31 receive signals from the IC card 2, the plurality of signals pass through the filter circuit 41, but there is no particular limitation on a method of selecting a signal to be supplied to the demodulation circuit 17. As described above, when a large number of antennas are arranged in an array, compared to the case where one large antenna is provided, the power supply per antenna is small and the antenna gain for the far field is small. Since the antenna of the present invention can be used, a wide communication area can be ensured, and the electromagnetic field strength far from the apparatus can be reduced.

Next, a specific example of the card detection circuit used in the IC card system according to the first embodiment will be described. First, a first embodiment of the card detection circuit 32 will be described with reference to FIG. The first of the card detection circuit
In the embodiment 32a, the amplifier 41 amplifies the voltage indicated by the impedance at both ends of the antenna 31 in which the capacitors 37 are connected in series, and the voltage (impedance) of two signals input from the adjacent antenna 31 via the amplifier 41. ) And outputs a potential difference, and a determiner 43 that determines the presence or absence of a card based on the level of the input voltage value.

The operation of the first embodiment 32a will be described. A signal detected as a change in impedance from each antenna 31 is amplified by an amplifier 41 and output to a voltage comparator 42. The voltage amplifier 42 compares the voltages of two adjacent antennas with each other and determines the potential difference between the two signals.
Output to 3. If the absolute value of the voltage of the input signal is equal to or higher than a certain level, the determiner 43 outputs a signal indicating that the antenna with the higher input voltage is to be communicated with the IC card 2. Since the signals of adjacent antennas are compared, the absolute value of the output of at least one voltage comparator becomes equal to or higher than a certain level when the IC card 2 comes close to or separates from the antenna. It can be determined whether or not it is in the vicinity.

Next, a second embodiment of the card detection circuit 32 will be described with reference to FIG. The second embodiment 32b of the card detection circuit compares the phase of an input signal with a wave source 51 that generates an ultrasonic wave so as to face each of the antennas 31 arranged in an array on the reader / writer 1. The phase comparator 52 is arranged. That is, the wave source 51
And the phase comparator 52 are arranged on a surface facing each antenna 31.

The operation of the second embodiment 32b will be described. In the case of the second embodiment, the IC card 2 is inserted between the antenna 31 and the card detection circuit 32b. Therefore, the ultrasonic wave output from the wave source 51 is I
When the C card 2 is not on the opposing antenna, it is reflected on the surface of the antenna and enters the phase comparator 52. The phase at this time is used as a reference. Next, when the IC card is present on the opposite antenna, the ultrasonic wave is reflected on the surface of the IC card and is input to the phase comparator 52, so that the phase is shifted. By detecting this deviation by the phase comparator 52, it is possible to detect on which antenna the IC card 2 is present.

Next, a third embodiment of the card detection circuit 32 will be described with reference to FIG. The third embodiment 32c of the card detection circuit is the same as the antenna 3 arranged in an array.
Light emitting sources 61 such as infrared light and fluorescent lamps arranged between
And an illuminance comparator 62, which is a means for observing the illuminance arranged on the opposite surface of the antenna. That is, the light source 6
Reference numeral 1 denotes an antenna, and an illuminance comparator 62 is disposed on the opposite surface of the antenna. The operation of the third embodiment 32c will be described. In the case of the third embodiment, the IC card 2 is inserted between the antenna 31 and the illuminance comparator 62. Therefore, the light output from the light emitting source 61 is directly applied to the illuminance comparator 62 when the IC card is not present in the vicinity. The illuminance at this time is used as a reference. Next, when the IC card 2 is present in the vicinity, the light emitted to the illuminance comparator 62 is blocked, so that the illuminance decreases. By detecting this difference by the illuminance comparator 62, it is possible to detect on which antenna the IC card 2 is present.

Next, a second embodiment according to the present invention will be described with reference to FIGS. FIG. 6 is a schematic configuration diagram showing a second embodiment of the non-contact IC card system according to the present invention. FIG. 7 is a diagram illustrating an arrangement of antennas installed in the reader / writer device, an antenna that transmits and receives an IC card without prediction, and an antenna that transmits and receives an IC card with prediction. The second embodiment differs from the first embodiment in that a card operation prediction circuit 3 is provided between a card detection circuit 32 and a distribution circuit 33.
5 is provided. Other components are the same as the components of the contactless IC card system shown in FIG.
Therefore, the other components are denoted by the same reference numerals as those shown in FIG.

For example, the antenna 31 of the reader / writer 1
Is larger than the antenna 21 of the IC card 2, there is a possibility that the communication target antenna is switched during communication and a communication error occurs. Therefore, the card operation prediction circuit 35
As shown in FIG. 7, an antenna that can be predicted as the next communication target (an antenna that is predicted as a direction in which the IC card 2 is moved) is also determined from the position of the antenna that is the current communication target detected by the card position detection circuit 32. Predicting and providing a signal for the predicted antenna to the distribution circuit 33.
The distribution circuit 33 distributes the modulated signal obtained from the modulation circuit 13 also to the antenna that is the current communication target and the antenna that can be predicted as the next communication target, so that the antenna that can be predicted as the next communication target is in a communicable state. Keep it. As a result, the path through which the IC card passes is already in a communicable state. In particular, when the size of the antenna 31 of the reader / writer 1 is made larger than the size of the antenna 21 of the IC card 2, the antenna distributed simultaneously by the distribution circuit 33 as much as possible from the viewpoint of reducing the intensity of the electromagnetic field far from the apparatus. Want to reduce the number of However, when the IC card 2 is located in the vicinity of the antenna detected by the card detection circuit 32, the IC card 2 is switched from the antenna detected by the card detection circuit 32 to its adjacent antenna and moved, and communication becomes impossible. Has the potential. Therefore, in the card operation prediction circuit 35, the movement of the IC card 2 is predicted from the position of the antenna to be communicated currently detected by the card position detection circuit 32, and the predicted antenna is modulated by the distribution circuit 33. By distributing the signals, efficient power transmission can be performed without causing a communication error, and the electromagnetic field strength far from the apparatus can be reduced.

As shown in FIG. 2, the size of the antenna 31 of the reader / writer 1 is
1, the card operation prediction circuit 35 is provided between the card detection circuit 32 and the distribution circuit 33, and based on the IC card movement prediction by the card operation prediction circuit 35, the distribution circuit 33 Is a modulation circuit 13
Signal (power transmission signal and communication signal) obtained from
Can be distributed to an appropriate antenna 31.

[0024]

According to the present invention, the antenna size of the reader / writer can be set to an antenna size having a large coupling coefficient with respect to the card antenna, and efficient power transmission can be performed. It has an effect that can be done. Further, according to the present invention, by arranging the antennas of the reader / writer in an array and selecting the antenna according to the movement of the IC card, it is possible to realize a wide communication area and perform efficient power transmission. Therefore, there is an effect that the intensity of the electromagnetic field far from the apparatus can be reduced.

[Brief description of the drawings]

FIG. 1 is a first diagram of a contactless IC card system according to the present invention.
It is a schematic structure figure showing an embodiment.

FIG. 2 is a diagram showing a relative positional relationship between an array antenna arranged in a reader / writer and an antenna formed in an IC card, and an antenna transmitting and receiving to and from the IC card.

FIG. 3 is a schematic diagram showing a first embodiment of a card detection circuit used in a non-contact IC card system.

FIG. 4 is a schematic diagram showing a second embodiment of the card detection circuit used in the non-contact IC card system.

FIG. 5 is a schematic diagram showing a third embodiment of the card detection circuit used in the non-contact IC card system.

FIG. 6 shows a second example of the non-contact IC card system according to the present invention.
It is a schematic structure figure showing an embodiment.

FIG. 7 shows a relative positional relationship between an array antenna arranged on a reader / writer and an antenna formed on an IC card, and an antenna for transmitting and receiving to and from an IC card when no prediction is made, and an IC card for transmitting and receiving when there is prediction. FIG.

FIG. 8 is a schematic configuration diagram showing a conventional non-contact IC card system.

FIG. 9 is a graph showing a coupling coefficient between a reader / writer and an IC card.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reader / writer, 2 ... Card, 11 ... OSC, 12
... Data processing circuit, 13 ... Modulation circuit, 14 ... Gain control circuit, 15 ... Driver circuit, 16 ... Antenna,
17 demodulation circuit, 18 amplifier, 19 k-detection circuit, 2
Reference Signs List 1 antenna, 22 demodulation circuit, 23 data processing circuit, 24 modulation circuit, 25 rectifier circuit, 26 power supply circuit, 31 antenna, 32 card detection circuit, 33 distribution circuit, 34 filter circuit, 35: card operation prediction circuit, 41: amplifier, 42: voltage comparator, 43: determiner,
51 ... wave source, 52 ... phase comparator, 61 ... light emission source, 62 ...
Illuminance comparator.

Claims (14)

[Claims] 1. An electric power transmission and an IC without contact to an IC card
A reader / writer device for transmitting and receiving communications to and from a card in a non-contact manner, comprising: a plurality of antennas arranged in an array for transmitting power to the IC card; Card detection means for detecting information on the position of the IC card; and means for selecting an antenna for transmitting power to the IC card based on the position information of the IC card detected by the card detection means. Reader /
Writer device. 2. A non-contact power transmission and IC to an IC card.
A reader / writer device for transmitting and receiving communications to and from a card in a non-contact manner, comprising: a plurality of antennas arranged in an array for transmitting power to the IC card; Card detection means for detecting information in which the IC card is located, IC card movement range prediction means for predicting a movement range in which the IC card is likely to move from the position of the IC card detected by the card detection means; Means for selecting an antenna for transmitting power to the IC card based on the position information of the IC card detected by the card detection means and the movement range predicted by the IC card movement range prediction means. Reader / writer device. 3. Non-contact power transmission and IC to an IC card
A reader / writer device for transmitting and receiving communication to and from a card in a non-contact manner, comprising: a plurality of antennas arranged in an array for transmitting power to the IC card and transmitting and receiving communication to and from the IC card; Card detecting means for detecting information on the position of the IC card in the vicinity of the plurality of antennas, and transmitting and receiving power and communication to and from the IC card based on the position information of the IC card detected by the card detecting means. Means for selecting an antenna to be performed. 4. Non-contact power transmission and IC to an IC card
A reader / writer device for transmitting and receiving communication to and from a card in a non-contact manner, comprising: a plurality of antennas arranged in an array for transmitting power to the IC card and transmitting and receiving communication to and from the IC card; Card detecting means for detecting information on the position of the IC card in the vicinity of the plurality of antennas, and a movement range in which the IC card may move from the position of the IC card detected by the card detecting means IC card movement range estimating means to perform power transmission and communication to and from the IC card based on the IC card position information detected by the card detecting means and the movement range predicted by the IC card movement range estimating means. Means for selecting an antenna for performing the following. 5. A filter means for extracting a signal received by a high sensitivity antenna among the plurality of antennas,
5. The reader / writer device according to claim 3, further comprising demodulation means for demodulating a signal extracted by the filter means and converting the signal into reception data. 6. The reader / writer device according to claim 1, wherein the information on the location of the IC card detected by the card detection means is information on an antenna on which the IC card is located. . 7. The card detecting means according to claim 1, wherein said card detecting means is configured to detect a position of an IC card by comparing a voltage or a current generated in an adjacent antenna. 5. The reader / writer device according to 4. 8. The card detecting means according to claim 1, further comprising: a wave source for generating an ultrasonic wave corresponding to said antenna; and information on a position of an IC card based on a phase difference between signals input by the ultrasonic wave generated by said wave source. 5. The reader / writer device according to claim 1, wherein said reader / writer device comprises a detecting means for detecting. 9. The card detecting means includes: a light emitting source for emitting light corresponding to the antenna; and a light emitting source for detecting whether or not the light emitted by the light emitting source is blocked by the IC card. 3. A light receiving means for detecting information to be detected.
Or the reader / writer device according to 3 or 4. 10. A non-contact IC card system for performing non-contact communication between a reader / writer and an IC card, wherein the reader / writer has an array for transmitting power to the IC card. A plurality of antennas arranged; card detection means for detecting information on the location of the IC card near the plurality of antennas; and power supply to the IC card based on the position information of the IC card detected by the card detection means. Means for selecting an antenna for transmission. 11. A non-contact IC card system for performing non-contact communication between a reader / writer and an IC card, wherein the reader / writer has an array for transmitting power to the IC card. A plurality of antennas arranged, card detection means for detecting information on the IC card located near the plurality of antennas, and a possibility that the IC card will move from the position of the IC card detected by the card detection means IC card movement range estimating means for estimating a certain moving range, and an IC card based on the IC card position information detected by the card detecting means and the movement range predicted by the IC card moving range estimating means. Means for selecting an antenna for performing power transmission. 12. A non-contact IC card system for performing non-contact communication between a reader / writer and an IC card, wherein the reader / writer has a function of transmitting power to the IC card and transmitting data to and from the IC card. A plurality of antennas arranged in an array for transmitting and receiving communication, card detection means for detecting information on the IC card located in the vicinity of the plurality of antennas, and an IC detected by the card detection means;
A means for selecting an antenna for transmitting and receiving power to and from the IC card based on the position information of the C card. 13. A non-contact IC card system for performing non-contact communication between a reader / writer and an IC card, wherein the reader / writer has a function of transmitting power to the IC card and transmitting data between the reader / writer and the IC card. A plurality of antennas arranged in an array for transmitting and receiving communication, card detection means for detecting information on the IC card located in the vicinity of the plurality of antennas, and an IC detected by the card detection means;
IC card movement range prediction means for predicting a movement range in which the IC card may move from the position of the C card, position information of the IC card detected by the card detection means, and prediction by the IC card movement range prediction means A means for selecting an antenna for transmitting and receiving power to and from the IC card based on the moved range of the contactless IC card. 14. The reader / writer further comprises: a filter for extracting a signal received by a high-sensitivity antenna among the plurality of antennas; and a demodulator for demodulating the signal extracted by the filter and receiving data. 14. The non-contact IC card system according to claim 12, further comprising: a demodulation unit that converts the data into a data.