JP2000036017A - Noncontact information transmitting and receiving system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always surely transmit and receive information and to reflect a user's intention in a noncontact information transmitting and receiving system such as an IC card. SOLUTION: Concerning this noncontact information transmitting and receiving system, an antenna receiving level detector 2 detecting the level of a received signal from the IC card 61 is provided on a reader and writer 1, and only when a receiving level obtained by the detector 2 exceeds a previously set threshold value, a data processing circuit 55' transmits writing data to the IC card 61. In addition, by setting the threshold value to be a receiving level obtained at the time of intentionally bringing the IC card 61 to the reader and writer 1, it is possible to judge the permission of reading and/or writing with respect to information based on whether the user intentionally brings the IC card 61 to the reader and writer 1, to prevent inconvenience in which information is automatically written in the IC card though the user does not desire to use the IC card.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contactless information transmission / reception system comprising a portable information transmission / reception device such as an IC card for transmitting and receiving signals to and from each other wirelessly and a read / write device therefor.

[0002]

2. Description of the Related Art In recent years, a so-called non-contact IC card system for reading information stored in an IC card in a non-contact manner by a predetermined reading / writing device or writing new information has been put into practical use. is there. Such a non-contact IC card system is, for example, an entry / exit management device in a facility requiring a certain level of security,
It is expected to be used in ticket gates at stations. FIG. 3 is a block diagram showing a general configuration of a conventional contactless IC card system A0. In the system A0, first, in the read / write unit 51, the carrier generated by the oscillation circuit 52 is modulated by the signal from the data processing circuit 55 through the modulation circuit 56, and the modulated wave is amplified by the constant current driver circuit 57. It is transmitted to the IC card 61 by driving the antenna coil 53 at a constant current. When the IC card 61 enters the communication range of the read / write device 51, a signal from the read / write device 51 is received by the tuning resonance circuit including the antenna coil 62 in the IC card 61. As a result, the power supply circuit 63 is turned on, and the received signal is demodulated by the demodulation circuit 64 and sent to the data processing circuit 66 in the CPU 65. In the data processing circuit 66, the ID information and the like stored in the memory 67 are read, modulated by the modulation circuit 68, and sent out from the antenna coil 62 to the reading / writing device 51. In the read / write device 51,
When a signal from the IC card 61 is received by the antenna coil 53, the received signal is demodulated by the demodulation circuit 54, and is subjected to predetermined data processing by the data processing circuit 55, for example, the ID.
Information collation processing and the like are performed. When new information needs to be written to the IC card 61, the read / write unit 51 sets the data processing circuit 55
, The write data is transmitted through the modulation circuit 56, the constant current driver circuit 57, and the antenna coil 53. The IC card 61 receives write data from the read / write unit 51 and performs a write process on the memory 67 by the data processing circuit 66.

[0003]

The above-mentioned conventional non-contact IC
In the card system A0, if the IC card 61 is within the communication range of the reader / writer 51, the IC card 6
1 is turned on, and the I
Reading and writing of information in the C card 61 are performed. However, since the distance between the IC card 61 and the reading / writing device 51 is constantly changing, the communication state is also constantly changing, and there is a high possibility that a reading error or a writing error occurs due to the deterioration of the communication state during the communication. Was. Particularly at the time of writing, a more stable communication state is required than at the time of reading. If the IC card 61 is within the communication range of the reader / writer 51, communication is performed regardless of the intention of the user of the IC card 61.
There is also a problem that information in the IC card is read or written without permission even if the use of the C card is not desired. The present invention has been made in view of the above circumstances, and its purpose is to be able to always reliably transmit and receive information, and to be able to reflect the user's intention in the contents of processing. To provide a non-contact information transmission / reception system.

[0004]

In order to achieve the above object, the present invention comprises a portable information transmitting / receiving device and a reading / writing device for mutually transmitting and receiving signals to and from each other. A non-contact information transmission / reception system for reading and / or writing predetermined information in the portable information transmission / reception device by the read / write device when within a communication range of the read / write device. Detecting means for detecting a predetermined state value indicating a communication state between the read / write device and the portable information transmitting / receiving apparatus; and a predetermined state value for the predetermined state value detected by the detecting means. Threshold value storage means for storing the threshold value in advance, and the state value detected by the detection means and the predetermined value stored in the threshold value storage means provided on the read / write device. Based on the value, comprises a judgment means for reading and / or writing permission judgment on the predetermined information in the portable information transceiver,
A non-contact information transmission / reception system is characterized in that the reading / writing device reads and / or writes predetermined information in the portable information transmission / reception device in accordance with the permission judgment of the judgment means. Further, if the predetermined threshold is set to a value of a state value obtained when the portable information transmitting / receiving device is consciously approached to the read / write device, the user can read / write the portable information transmitting / receiving device. Based on whether or not the user has consciously approached the device, the user can determine whether to permit reading and / or writing of the predetermined information in the portable information transmitting / receiving device. Can be reflected. Further, if the detection means and the determination means are provided on the read / write device, it is not necessary to change the configuration of the portable information transmitting / receiving device, so that a small and low power configuration can be maintained. As the predetermined state value detected by the detecting means, for example, a signal receiving intensity, a distance between the read / write device and the portable information transmitting / receiving device, or the like can be used. The portable information transmitting device can be constituted by, for example, an IC card.

[0005]

In the contactless information transmitting / receiving system according to the present invention,
Only when the state value detected by the detecting means, for example, the signal reception intensity or the distance between the read / write device and the portable information transmitting / receiving device is larger than a predetermined threshold value, the portable information Reading and / or writing of the predetermined information in the transmitting / receiving device is performed. Therefore, even in non-contact information transmission / reception in which the communication state is unstable, it is possible to always reliably read and write information. In addition, the predetermined threshold is set to, for example, a state value obtained when the portable information transmitting / receiving device is consciously approached to the read / write device. Thereby, the permission determination of reading and / or writing for the predetermined information in the portable information transmitting / receiving device is performed based on whether the user has consciously brought the portable information transmitting / receiving device closer to the reading / writing device. Is performed, the intention of the user can be reflected in the contents of the processing.

[0006]

Embodiments and examples of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. The following embodiments and examples are mere examples embodying the present invention, and do not limit the technical scope of the present invention. Here, FIG. 1 is a block diagram showing a schematic configuration of a contactless information transmitting / receiving system A1 according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a schematic configuration of a contactless information transmitting / receiving system A2 according to another embodiment. It is.
The contactless IC card system A1 according to the present embodiment
As shown in FIG. 1, a read / write device 1 (an example of a read / write device) and an IC card 61 (an example of a portable information transmission device)
It is composed of The same components as those of the conventional non-contact IC card system A0 are denoted by the same reference numerals, and detailed description thereof will be omitted. In the non-contact IC card system A1, the configuration of the IC card 61 is almost the same as that of the conventional non-contact IC card system A0. The read / write device 1 in the conventional non-contact IC card system A0 is also used as the read / write device 1.
Although there are many portions in common with the antenna reception level detector 2 (an example of a detecting means) for detecting a reception level (an example of a predetermined state value indicating a communication state) by the antenna coil 53, The processing circuit 55 ′ (an example of a judging means) only detects when the reception level obtained by the antenna reception level detector 2 exceeds a preset threshold.
The difference is that the configuration is such that the write data to the IC card 61 is transmitted. Here, the threshold value is stored in advance in a memory m (an example of a threshold value storage means) in the data processing circuit 55 '.
The IC card 61 and the read / write unit 1 are set when the reception level matches the threshold value so that the value can be stably written to the card 61. Is set to be a distance (for example, several tens of cm) at which the user needs to be aware of and bring the IC card closer to the reader / writer. As a result, the reception level obtained by the antenna reception level detector 2 is set when the user is conscious of the IC card 61 and approaches the reader / writer 1 and writes data to the IC card 61. The threshold value is exceeded only when the value is sufficiently stable.

Next, the processing operation of the non-contact IC card system A1 will be described. First, in the reader / writer 1,
The carrier generated by the oscillation circuit 52 is transmitted to the data processing circuit 5.
Modulated by the signal from 5 'through the modulation circuit 56,
The modulated wave is amplified by the constant current driver circuit 57 and transmitted by driving the antenna coil 53 with a constant current. When the IC card 61 enters the communication range of the reader / writer 1, the IC card 61
The signal from the read / write unit 1 is received by a tuning resonance circuit composed of: As a result, the power supply circuit 63 is turned on, and the received signal is demodulated by the
The data is sent to a data processing circuit 66 in the memory 65. In the data processing circuit 66, the ID information and the like stored in the memory 67 are read, modulated by the modulation circuit 68, and sent out from the antenna coil 62 to the reading / writing device 51. In the reader / writer 1, when a signal from the IC card 61 is received by the antenna coil 53, the received signal is converted into a demodulation circuit 54.
The data processing circuit 55 'performs predetermined data processing, for example, collation processing of the ID information. That is, in the non-contact IC card system A1, the IC card 6
As for the reading of the information from the IC card 61, the IC card 61 is in the communication range of the read / write unit 1 (by the signal from the read / write unit 1) as in the conventional non-contact IC card system A0. If it is in the range where the power is turned on, but not in the range where the communication quality is compensated), it is performed unconditionally. In parallel with the above processing, the reception level of the antenna coil 53 is detected by the antenna reception level detector 2, and the data processing circuit 55 '
In, the reception level obtained by the antenna reception level detector 2 is compared with the preset threshold.
Here, if the reception level is smaller than the threshold, information is not written from the read / write unit 1 to the IC card 61, and the process ends here. That is, the reading / writing device 1 has only read data from the IC card 61. On the other hand, if the reception level is equal to or higher than the threshold value, the data processing circuit 55 'allows the user to approach the reader / writer 1 consciously of the IC card 61, and the IC card 61 sufficiently writes the data. It is determined that the distance is such that the distance can be stably performed, and the write data is transmitted through the modulation circuit 56, the constant current driver circuit 57, and the antenna coil 53. When the IC card 61 receives write data from the read / write device 51,
The data processing circuit 66 performs a write process on the memory 67. As described above, in the non-contact IC card system A1 according to the present embodiment, the read / write
1, the signal reception level from the IC card 61 is
Information is not written to the IC card 61 unless the threshold value is set to a value that is sufficient to stably write data. Therefore, even in non-contact communication with an IC card having an unstable communication state, it is always reliable. Information can be written. In addition, the threshold value is such that the distance between the IC card 61 and the reading / writing device 1 when the reception level matches the threshold value requires that the user be conscious of bringing the IC card closer to the reading / writing device. A certain distance (for example, several tens
m), information is written to the IC card only when the user consciously brings the IC card 61 close to the reader / writer 1. Therefore,
Even if the user does not want to use the IC card, it is possible to prevent a problem that the information is written into the IC card without permission, and it is possible to reflect the user's intention in the contents of the processing.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a contactless IC card system A1 according to the above embodiment, a signal reception level from an IC card 61 is used as an example of a state value indicating a communication state between the reader / writer 1 and the IC card 61. Although it is used, it is not limited to this. For example, as in the non-contact IC card system A2 shown in FIG.
Is installed in the data processing circuit 55 'based on the distance obtained here.
It may be determined whether or not information can be written to the card. Of course, both may be used together. Further, in the above example, the antenna receiving level detector 2 and the distance measuring device 3 are provided on the read / write device side, and the permission of writing is also determined on the read / write device side. IC with
Although the object is achieved without changing the configuration on the card side, it is of course possible to mount the above configuration on the IC card side. Further, in the above-described example, a limitation is provided only for writing information to the IC card. However, a limitation may be similarly provided for reading information from the IC card. In this case, for example, when the first signal is transmitted from the IC card to the reading / writing device, a dummy signal having no particular meaning is transmitted, and when reading is permitted on the reading / writing device side, actual ID information and the like are transmitted. What should I do?

[0009]

As described above, the present invention comprises a portable information transmitting / receiving device and a reading / writing device for transmitting and receiving signals to and from each other wirelessly, and the portable information transmitting / receiving device is used for the reading / writing device. A contactless information transmission / reception system for reading and / or writing predetermined information in the portable information transmission / reception device by the read / write device when within the communication range, provided on the read / write device; Detecting means for detecting a predetermined state value indicating a communication state between the read / write apparatus and the portable information transmitting / receiving apparatus; and a predetermined threshold value for the predetermined state value detected by the detecting means is stored in advance. A threshold value storage means for performing the determination based on the state value detected by the detection means and the predetermined threshold value stored in the threshold value storage means provided on the read / write device. Determining means for determining permission of reading and / or writing of the predetermined information in the portable information transmitting / receiving apparatus; and determining whether or not the portable information transmitting / receiving apparatus uses the reading / writing apparatus in accordance with the permission determination of the determining means. The system is configured as a non-contact information transmission / reception system that performs reading and / or writing of predetermined information. Therefore, even in non-contact information transmission / reception with an unstable communication state, information can always be read and written reliably. It can be carried out. Further, if the predetermined threshold value is set to a value of a state value obtained when the portable information transmitting / receiving device is consciously approached to the reading / writing device,
Determining permission of reading and / or writing of the predetermined information in the portable information transmitting / receiving device based on whether or not the user has consciously brought the portable information transmitting / receiving device closer to the reading / writing device; Can prevent the user from reading and writing information without permission even if the user does not want to use the portable information transmission / reception device, and can reflect the user's intention in the processing. Become. Further, if the detection means and the determination means are provided on the read / write device, it is not necessary to change the configuration of the portable information transmitting / receiving device, so that a small and low power configuration can be maintained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a contactless information transmission / reception system A1 according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a non-contact information transmission / reception system A2 according to another embodiment.

FIG. 3 is a non-contact information transmission / reception system A according to the related art.
FIG. 2 is a block diagram showing a schematic configuration of a block 0.

[Explanation of symbols]

 1, 1 ': read / write device (example of read / write device) 61: IC card (example of portable information transmission device) 2: antenna reception level detector (example of detection means) 3: distance measuring device (detection) 55 '... data processing circuit (example of diagnostic means) m ... memory (example of threshold storage means)

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Minoru Kobayashi 1-5-5 Takatsukadai, Nishi-ku, Kobe City, Hyogo Prefecture Inside Kobe Research Institute, Kobe Steel Ltd. (72) Inventor Takuya Kusaka Nishi-ku, Kobe City, Hyogo Prefecture 1-5-5 Takatsukadai Kobe Steel Research Institute, Kobe Research Institute (72) Inventor Yoshiro Nishimoto 1-5-5 Takatsukadai, Nishi-ku, Kobe-shi, Hyogo Prefecture Kobe Steel Technical Research Institute Kobe Research Institute F-term (Reference) 2C005 MA16 MA29 MB01 NA09 SA21 TA22 5B035 AA03 AA11 BB02 BB09 CA23 5B058 CA17 CA23 KA01

Claims (6)

[Claims] 1. A portable information transmitting / receiving device and a reading / writing device for mutually transmitting and receiving signals to and from each other by radio, and when the portable information transmitting / receiving device is within a communication range of the reading / writing device, the reading is performed. In a non-contact information transmitting / receiving system for reading and / or writing predetermined information in the portable information transmitting / receiving device by a writing device,
Detecting means provided on the read / write device for detecting a predetermined state value indicating a communication state between the read / write device and the portable information transmitting / receiving device; Threshold value storage means for previously storing a predetermined threshold value with respect to the state value, and the state value provided on the read / write device and detected by the detection means, and the predetermined threshold value stored in the threshold value storage means. Reading and / or reading the predetermined information in the portable information transmitting / receiving device based on
Or a determination means for making a write permission determination, wherein the read / write device reads and / or writes predetermined information in the portable information transmitting / receiving device in accordance with the permission determination of the determination means. Contactless information transmission and reception system. 2. The method according to claim 1, wherein the predetermined threshold value stored in the threshold value storage means is set to a value of the state value obtained when the portable information transmitting / receiving device is consciously approached to the read / write device. Item 1. A non-contact information transmitting / receiving system according to Item 1. 3. The non-contact information transmission / reception system according to claim 1, wherein said detection means and said judgment means are provided on said read / write device. 4. The contactless information transmission / reception system according to claim 1, wherein the predetermined state value detected by the detection means includes a signal reception intensity. 5. The non-communication device according to claim 1, wherein said predetermined state value detected by said detecting means includes a distance between said read / write device and said portable information transmitting / receiving device. Contact information transmission and reception system. 6. The contactless information transmission / reception system according to claim 1, wherein said portable information transmission device is constituted by an IC card.