JP3617341B2 - Non-contact type IC card reader - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a non-contact type IC card reader for identifying a plurality of IC cards.
[0002]
[Prior art]
In recent years, IC cards are increasingly used as cards. Among these IC cards, there is a non-contact type IC card, and a plurality of non-contact type IC cards are usually mounted and used at a predetermined mounting position of a card reader.
When identifying a plurality of non-contact type IC cards, the card reader identifies each IC card by a unique serial number SN that is different for each IC card.
[0003]
In this case, the response timing of each IC card is divided into time slots, and each IC card receives a data output request from the card reader, and a response frame including its own serial number SN in the time slot determined by a random number. Return the data to the card reader.
[0004]
FIG. 4 is a diagram illustrating an example of the output timing of response frame data when _four IC cards 3 _{1 to} 3 ₄ are placed at predetermined placement locations of the reader / writer (card reader) 2.
When each IC card 3 _{1 to} 3 ₄ receives a data output request from the reader / writer 2, it generates a random number based on its own serial number SN, and in accordance with the generated random number, of the four time slots TS 1 to TS 4 One is defined as its own time slot. In the example of FIG. 4, IC card ₃ in ₁ time slot TS3, IC card _{3 2} timeslots TS1, IC card _{3 3} timeslots TS4, IC card _{3 4} time slots defined respectively as TS2 It is an example.
[0005]
In this case, the reader / writer 2 detects the presence or absence of response frame data from the IC card and the presence or absence of collision of response frame data for each time slot, and identifies the IC card. That is, the reader / writer 2 recognizes the time slot TS1 at time point (1) in FIG. 4 and starts detecting the response frame data. When the response frame data in the time slot TS1 is detected, it is included in the response frame data. It recognizes that it is the response data of the IC card 3 ₂ from the serial number SN to be. Next, the reader / writer 2 recognizes the time slot TS2 at the time point (2) and starts detecting the response frame data. When the response frame data of the time slot TS2 is detected, the serial data included in the response frame data is detected. It recognizes that from the number SN is a response data of the IC card _{3 4.} Subsequently, at time point (3), the time slot TS3 is recognized and detection of the response frame data is started. When the response frame data of the time slot TS3 is detected, the IC is calculated from the serial number SN included in the response frame data. It recognizes that it is the response data of the card 3 _1. Finally, at time (4), the time slot TS4 is recognized and detection of the response frame data is started. When response frame data of the time slot TS4 is detected, the IC card is detected from the serial number SN contained in the response frame data. 3 Recognize that the response data is ₃ .
[0006]
If response frame data from a plurality of IC cards is detected when response frame data of one time slot TS is detected, the reader / writer 2 detects the serial number SN again, thereby detecting 1 You can select one card.
[0007]
[Problems to be solved by the invention]
The conventional card reader device recognizes each predetermined time slot in order from the slot TS1, detects the response frame data of each time slot, and identifies each IC card. As a result, only response frames corresponding to the number of the four slots could be detected. For this reason, when receiving a frame from an IC card that transmits a response frame via the fifth or sixth slot of six time slots, for example, which is larger than the fixed slot number, there is a problem that it cannot be easily handled. there were.
Accordingly, an object of the present invention is to accurately receive a response frame from an IC card that transmits a response frame to any one of an arbitrary number of time slots with a simple configuration and identify the IC card.
[0008]
[Means for Solving the Problems]
In order to solve such a problem, the present invention receives each response frame from a plurality of IC cards that transmit a response frame to each one through any one of a plurality of time slots in response to a data output request. In the non-contact type IC card reader that performs the above, when it is predetermined that the response frames are sequentially transmitted in the order of time slots TS1, TS2, TS3,. point or et when the data output request, and setting means for setting a time before northern time slot TSn to the time the transmission is complete the response frame, and counting means for counting the time set by the setting means , as well as starting the time measuring means when the transmission of the data output request to the plurality of IC cards is completed, the start bit of the reply frame Out repeatedly executes the reception and the operation of the detection of the stop bit following the data of the data following the start bit up counting operation of the time measuring unit is completed, a response frame receiving unit for receiving a response frame from all of the IC card And detecting means for detecting a collision of data in the time slot, and means for requesting retransmission of a response frame when a data collision is detected by the detecting means .
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a configuration of a non-contact type IC card reader according to the present invention. In the figure, a reader / writer 2 which is a non-contact type IC card reader is wirelessly connected to each of the IC cards 3 _{1 to} 3 _n mounted at a predetermined mounting place of the reader / writer 2. A game (service) based on the use of an IC card, which is connected to a host (terminal) 1 that provides a game (service), etc., reads the data of each wirelessly connected IC card 3 _{1 to} 3 _n and sends it to the host 1 Is allowed.
[0010]
In FIG. 1, the reader / writer 2 includes a CPU 21, a digital processing unit 22, a wireless transmission / reception unit 23, a timer 24, and an antenna AT.
Each IC card 3 _{1 to} 3 _n includes a controller 31, a memory 32, a wireless transmission / reception unit 33, and an antenna AT.
[0011]
When the IC card 3 is placed at a predetermined placement location, the CPU 21 of the reader / writer 2 sends a data output request to the digital processing unit 22. This data output request is transmitted to the IC card side as a radio signal via the digital processing unit 22, the radio transmission / reception unit 23, and the antenna AT. When the controller 31 of the IC card 3 receives a wireless signal indicating a data output request via the antenna AT and the wireless transmission / reception unit 33, the controller 31 of the IC card 3 has its own serial number SN stored in advance in the memory 32 (a unique card unique to each card). ) And value information (amount information) are read out, and data including the serial number SN is output as response frame data to the wireless transmission / reception unit 33 in a time slot indicating its own transmission timing.
[0012]
This response frame data is transmitted to the reader / writer 2 side as a radio signal via the antenna AT. The response frame data is transmitted to the CPU 21 via the antenna AT of the reader / writer 2, the wireless transmission / reception unit 23, and the digital processing unit 22.
When the response frame data is input, the CPU 21 of the reader / writer 2 identifies the IC card based on the card-specific serial number SN included in the response data. Then, the recognized serial number SN and the value information are sent to the host 1, and the host 1 performs authentication corresponding to the received serial number SN of the IC card, and whether or not services such as games are allowed depending on the presence or absence of the value information. Judging.
[0013]
By the way, when each IC card 3 _{1 to} 3 _n determines its transmission time slot, the controller 31 reads the serial number SN unique to the card from the memory 32 when receiving the data output request from the reader / writer 2, A random number is generated based on the serial number SN, and any one of the time slots TS1 to TSn is assigned according to the generated random value. Then, a response frame including its own serial number SN is transmitted to the reader / writer 2 side through the time slot.
[0014]
2, IC card ₃ in ₁ time slot TS3, IC card _{3 2} timeslots TS1, IC card _{3 3} timeslot TSn, IC card _{3 n} of time slots in the example defined respectively as TS2 is there.
[0015]
Here, the response frames transmitted from the respective IC cards 3 _{1 to} 3 _n to the reader / writer 2 are configured in a format as shown in FIG. That is, a start bit STB is added to the head of the response frame, a stop bit SPB is added to the tail of the response frame, and data DATA such as a serial number SN and value information is added between the start bit STB and the stop bit SPB. The configuration is assigned.
[0016]
Response data such one frame, as shown in FIG. 2, the first time slot TS1 IC card _{3 2,} from the next time slot TS2 in the IC card _{3 n,} from the IC card _{3 1} in the time slot TS3 followed, sequentially transmitted to the reader writer 2 side and the last time slot IC card 3 ₃ in TSn.
When receiving such a response frame transmitted for each time slot, the reader / writer 2 responds in the last time slot TSn from the time when a data output request is made to each of the IC cards 3 _{1 to} 3 _n . The time value until the frame is completely output (that is, the time value t1 shown in FIG. 2) is set in the timer 24, and the CPU 21 monitors the arrival of the response frame while the timer 24 times out.
[0017]
That is, the CPU 21 of the reader / writer 2 transmits a data output request to each of the IC cards 3 _{1 to} 3 _n , and when the transmission is completed, the timer 24 is started by setting the time value t1 shown in FIG. Thereafter, the digital processing unit 22 proceeds to an operation of detecting the start bit STB of the response frame. When the start bit STB is detected, the data DATA of the response frame is received next, and finally the stop bit SPB of the response frame is detected. Then, when the stop bit SPB is detected, the CPU 21 is notified when reception of the response frame of the first time slot TS1 is completed. Next, the CPU 21 proceeds to the operation of detecting the start bit STB of the next response frame.
[0018]
The CPU 21 repeatedly executes such a response frame reception operation until the timer 24 times out. As a result, the reader / writer 2 can receive all the response frames of the IC cards sequentially transmitted through the time slots TS1 to TSn.
When the transmission slots of each IC card are determined as four TS1 to TS4, the reader / writer 2 sets the above time value t1 in the last time slot TS4 from the time when the data output request is made to each IC card. The time when the response frame is output is determined and set in the timer 24, and the above-described response frame reception operation is performed until the timer 24 expires.
When the transmission slots of each IC card are determined as eight TS1 to TS8, the reader / writer 2 sets the above time value t1 in the last time slot TS8 from the time when the data output request is made to each IC card. The time when the response frame is output is determined and set in the timer 24, and the above-described response frame reception operation is performed until the timer 24 expires.
[0019]
As described above, the reader / writer 2 determines the timer value of the timer 24 according to the number of time slots, and detects the start bit STB of the response frame, the reception of the data DATA, and the detection of the stop bit SPB until the timer 24 times out. These operations are repeatedly executed. As a result, since the response frame from each IC card can be received without being conscious of the time slot, even if an IC card that transmits its own response frame in any of the eight time slots appears in the future, for example. By changing only the timer value of the timer 24, it is possible to accurately detect the response frame from such an IC card and identify the IC card.
[0020]
Here, an IC card (IC card 3 _{2 in} the example of FIG. ₂ ) that transmits a response frame in the first time slot TS1 is not placed at a predetermined location, and therefore no response frame is transmitted from the IC card. However, the reader / writer 2 can sequentially receive from the response frame of the slot TS2 by detecting the start bit STB of the response frame of the next time slot TS2.
[0021]
Further, for example, even when an IC card that transmits a response frame in the time slot TS3 (IC card 3 _{1 in} the example of FIG. 2) is not placed in a predetermined place, and therefore no response frame is transmitted from the IC card, After receiving the response frames of the time slots TS1 and TS2, it is possible to sequentially receive the response frames by detecting the start bit STB of the response frame of the time slot TS4.
If the start bit STB of the response frame cannot be detected at all even if the response frame detection operation described above is continued until the timer 24 times out, the reader / writer 2 places the IC card on the predetermined placement location. Judge that it is not.
[0022]
Note that a plurality of IC cards transmit response frames in the same time slot TS, and as a result, the data of each IC card collide in the time slot TS, and the serial number SN is duplicated (collision is detected). If one of them is requested, one IC card is selected by requesting retransmission of the response frame data.
[0023]
【The invention's effect】
As described above, according to the present invention, each response frame is received from a plurality of IC cards that transmit a response frame to each of the plurality of time slots in response to a data output request. Depending on the number of time slots, the time from the time when a data output request is sent to the IC card reader until the completion of the transmission in the time slot in which the response frame is finally transmitted among a plurality of time slots can be varied. Timekeeping means for timing and response frame receiving means for repeatedly executing each operation of detection of start bit of response frame, reception of data following start bit, and detection of stop bit following the above data until the timekeeping operation of timekeeping means is completed So that the response frame from each IC card is not conscious of the time slot. It is possible to receive. As a result, a response frame of each IC card that transmits a response frame to any one of an arbitrary number of time slots can be accurately received with a simple configuration, and each IC card can be identified.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of the present invention.
FIG. 2 is a diagram illustrating a transmission timing of a response frame of each IC card and a reception operation of a card reader that receives the response frame.
FIG. 3 is a diagram illustrating a format of a response frame transmitted from an IC card.
FIG. 4 is a diagram illustrating a receiving operation of a conventional card reader that receives a response frame from each IC card.
[Explanation of symbols]
1 ... Host (terminal), 2 ... non-contact _{reader-writer,} 3 1 _{to 3} n ... IC card, 21 ... CPU, 22 ... digital processing unit, 23 and 33 ... wireless transceiver, 24 ... timer, 31 ... controller, 32 ... Memory, AT, AT1-ATn ... Antenna.

Claims (1)

In a non-contact type IC card reader that receives each response frame from a plurality of IC cards that transmit a response frame to each of the plurality of time slots in response to a data output request,
Time slot TS1 to the data output request, TS2, TS3, · · ·, if they have been determined in advance so that the transmission of sequentially the response frame in the order of TSn is performed, or when the point of the data output request et al , setting means for presetting the time of the previous northern time slot TSn to the time the transmission is complete the response frame,
Time measuring means for measuring the time set by the setting means;
When the transmission of the data output request to the plurality of IC cards is completed, the timing means is activated to perform the timing operation, and the start bit of the response frame is detected, the data received following the start bit, and the data A response frame receiving means for repeatedly executing each operation of detecting the subsequent stop bit until the time measuring operation of the time measuring means is completed , and receiving response frames from all IC cards ;
Detecting means for detecting a collision of data in the time slot;
A non-contact type IC card reader, comprising: means for requesting retransmission of a response frame when a collision of data is detected by the detecting means .

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