JPH10222623A - Non-contact identifying system and mah-jong tile identifying system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To identify respective data carriers when the plural data carriers come into communication areas in a non-contact identifying system. SOLUTION: Respective identifying data areas are provided in the memory 6 of the data carrier 1. The identifying data areas simultaneously set a bit 1 in respective peculiar positions concerning the data carriers with a probability to enter the communication area and set the whole others to be zero. Thus, a crosstalk does not occur even when a reader/writer 11 simultaneously reads identifying data from the respective data carriers and the data carriers are identified based on identifying data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact identification system comprising a data carrier and a reader, and more particularly to a non-contact identification system capable of identifying a data carrier when a plurality of data carriers exist in a communication area, and a mahjong tile. Related to the identification system.

[0002]

2. Description of the Related Art Conventionally, identification of parts and products on an assembling / conveying line, identification of mahjong tiles, skiing gates, automatic ticket gates, and the like require mechanization of products and passing passengers. A system for identifying the information is required. Therefore, as shown in Japanese Patent Application Laid-Open No. 1-151831, a memory unit (data carrier) having a memory for an object to be identified is provided, and necessary information is written in such a memory by external data transmission. There has been proposed a contactless identification system that reads out the information as needed.

In a non-contact identification system, FIG.
As shown in (a), a plurality of data carriers (DC) 10
1-1 to 101-4 are read / write heads (RWH) 1
02 may come into the communication area. Even in such a case, it is necessary to identify each data carrier for normal data communication. In the conventional identification system, in order to identify a data carrier, a unique identification number is assigned to each data carrier in advance, a command for identifying the identification number is transmitted from the read / write head, and the identification number from the data carrier is transmitted. Try to receive data. At this time, if a plurality of data carriers are in the communication area and there is a response from the data carriers at the same time, interference occurs and normal transmission to the read / write head side cannot be performed. Therefore, as shown in FIG. 8B, an identification system is known in which each data carrier receives this command and responds after a time determined by a random number so that the responses of the data carriers do not overlap.

As disclosed in Japanese Patent Application Laid-Open No. 8-16739, collation data unique to each data carrier is set in advance, and when a plurality of data carriers are present in a communication area, collation is performed bit by bit. Data from each data carrier, and if there is interference, set one of the logical levels from the read / write head side, and set only the data carrier that matches this to the communicable state to identify the specific data carrier. A proposed method has been proposed.

[0005]

However, in such a method for identifying a plurality of data carriers, if a response from each data carrier is awaited after a predetermined time determined by a random number, the maximum response time is always required. I need to wait. Therefore, there is a disadvantage that it takes a long time to complete communication with all data carriers. Also, when the time until the response is controlled by a random number, there is a drawback that the communication may overlap with a plurality of data carriers.

Further, even in the method of confirming the collation data one bit at a time, it is necessary to identify whether or not there is an interference state every time one bit is transmitted, and communication between the data carrier and the read / write head is required. However, there is a disadvantage that it takes a long time to identify a plurality of data carriers.

The invention of claim 1 has been made in view of such a conventional problem, and has as its technical object to be able to simultaneously identify data carriers within a communication area. A second object of the present invention is to apply the non-contact identification system to a fully automatic mahjong tile reader so that a mahjong tile can be identified in a short time.

[0008]

According to a first aspect of the present invention, there is provided a contactless identification system including a data carrier and a reader for reading data from the data carrier, wherein the data carrier has an identification data area. And data communication means for reading an identification data area of the memory in response to a response command, wherein the identification data area of the memory has at least one unique bit in a data carrier group to be identified. Only the logic level of the other data carrier is different from that of the other data carriers, and the logic levels of the other bits are set to be common to all the data carriers, and the reader identifies the data carrier when identifying the data carrier. Read the identification data area and identify the data carrier in the communication area by the identification data. It is an butterfly.

The invention according to claim 2 of the present application is a mahjong tile identification system comprising a mahjong tile and a mahjong tile reading device, wherein the mahjong tile has a data carrier attached to each of the mahjong tiles. A memory having an identification data area; and data communication means for reading the identification data area of the memory in response to a response command, wherein the identification data area of the memory includes at least one of a data carrier group to be identified. Only the logical level of the unique bit is different from that of the other data carriers, and the logical levels of the other bits are set so as to be common to all the data carriers. When identifying the data carrier, the identification data area of the data carrier is read, and the mahjong tile in the communication area is identified by the identification data. And it is characterized in Rukoto.

According to the first aspect of the present invention having such features, all data carriers have a common logical level in the identification data area of the memory except for the logical level at a position unique to each data carrier. Set as follows. Therefore, when this data area is read when the data carrier is identified by the reader, responses from all data carriers in the communication area can be obtained. At this time, the identification data area is read at the same time, but if the output from the data carrier is changed at a specific logical level, the response from the data carrier actually in the communication area becomes the response from the other data carrier. Can be read without interference. Therefore, the data carrier can be identified based on the position of the logical level of the data carrier that has responded. Further, the invention of claim 2 applies this identification system to a mahjong tile identification system and embeds a data carrier in the mahjong tile, thereby automatically reading the tiles collected by the player at the time of reading, and playing the role thereof. It can be displayed.

[0011]

FIG. 1 is a block diagram showing a configuration of a contactless identification system according to an embodiment of the present invention. In this figure, the data carrier 1 has a resonance circuit 2 composed of a coil L1 and a capacitor C, and a rectifier circuit 3 and a shunt circuit 4 are connected to the resonance circuit 2. The rectifier circuit 3 rectifies and smoothes a signal obtained by the resonance circuit 2 to supply power to each unit in the data carrier 1. The data communication unit 5 demodulates a signal transmitted from the reader / writer from a signal obtained in the resonance circuit 2 when power is supplied from the rectifier circuit 3. Then, data is written to the memory 6 based on the received command and data, and data is read from the memory 6. Data read from the memory 6 is converted into a serial signal and applied to the shunt circuit 4. The shunt circuit 4 controls reverberation by controlling the short-circuit state of both ends of the resonance circuit 2 when the carrier stops at the timing of receiving the data carrier, and transmits a signal to the reader / writer side by the reverberation. It is.

On the other hand, the reader / writer 11 is
And a transmission circuit 13 and a reception circuit 14. The transmission circuit 13 has a transmission coil L2, which changes the duty ratio based on the transmission data at the time of data transmission, and intermits the carrier at a constant duty ratio at the time of reception. The receiving circuit 14 has a receiving coil L3, and receives a signal from a data carrier by determining the presence or absence of reverberation during a period in which the carrier stops when a signal is received.

In this embodiment, the memory 6 of the data carrier 1 has an identification data area. The identification data area is used to identify each data carrier when a plurality of data carriers enter the communication area of the reader / writer, and is set in a specific area of the memory as shown in FIG. I have. It is assumed that a plurality of data carriers that may enter the communication area of the reader / writer at the same time are each set so that at least one unique bit becomes a certain logical level, for example, 1. Other bits are common to all data carriers.
For example, when it is necessary to identify eight types of data carriers 1-1 to 1-8, the identification data area has 8 bits,
That is, it is 1 byte. In the identification data area of each data carrier, it is assumed that "1" is set in each unique bit as shown in FIGS. Bits at other positions are all set to “0”. In order to identify a larger number of data carriers, a necessary area of several bytes is set as an identification data area, and the bit in which each "1" is set is made different.

Next, an operation for identifying a data carrier will be described. FIG. 4A is a flowchart showing the operation of the reader / writer 11, and FIG.
6 is a flowchart showing the operation of the first embodiment. Reader / writer 11
When identifying the data carrier, first, in step 21, a read command of the identification data area is transmitted for identifying the data carrier. When receiving this command, the data carrier 1 returns data in the identification data area of the memory 6. FIG. 5A shows a signal transmitted from the transmission circuit 13 of the reader / writer 11 to the data carrier at the time of this reply. When the reader / writer 11 receives data, the carrier is intermittently transmitted at a constant period, for example, at a duty ratio of 50% as shown in the figure.

Now, the data carriers 1-1, 1-5, 1-
6 in the communication area at the same time, “00000001” and “0000000” are respectively stored in the above-mentioned identification data area.
"10000" and "00100000" are stored. When each data carrier receives the read command, it proceeds from step 31 to step 32 and reads this data simultaneously. Therefore, when reading the identification data area, the shunt circuit 4 of the data carriers 1-1, 1-5, and 1-6 controls the reverberation of each resonance circuit. , (D) are output. Since this signal is received simultaneously by the receiving circuit 14 of the reader / writer 11, the signal shown in FIG. 5E is obtained.

Accordingly, upon receiving the response, the reader / writer temporarily sets the pointer N to 0 in step 23, and determines whether or not the bit is 1 based on the presence or absence of reverberation (step 24). Then, the presence or absence of a data carrier is determined based on whether or not 1 is set (steps 25 and 2).
6) Check whether the pointer N has reached 7. If the pointer 7 is equal to or smaller than N, the process proceeds to step 28, where N is incremented, and the process returns to step 24 to repeat the same processing. By demodulating the signal in the identification data area in this manner, the response shown in FIG. 5F is obtained, and three data carriers 1-1, 1 are provided in the data communication area.
It can be recognized that -5 and 1-6 exist.

After the reader / writer identifies the data carrier in this way, it sends a command with identification data to each data carrier. In this case, data communication can be performed with a specific data carrier. Here, the logical level set in the identification data area of the memory is such that the logical level of a unique bit for identifying each data carrier is a level to which modulation is applied when transmitting a signal from the data carrier, and other than the unique bit. Is a logical level at which modulation is not performed when a signal is read from the data carrier. When the data carrier is used for merely identifying the data carrier, the reader / writer may always be operated only for reception.

FIG. 6 is a view showing a second embodiment of the present invention. The identification system according to the first embodiment is automatically applied to a fully automatic mahjong tile table which judges a winning combination and calculates a score. It was what was. FIG. 6A is a top view of the mahjong table,
Mahjong tile readers 21 to 24 are provided at the positions of the respective players. The mahjong tile readers 21 to 24 are the same as the reader / writers described above, but have a function of merely reading. The mahjong tile reading devices 21 to 24 need to recognize all the hands of the tiles obtained by the players. Since Mahjong uses 144 tiles, a data carrier is embedded in each tile. Then, an identification data area having a data amount of 144 bits is used to determine all tiles.
In the above-mentioned data carrier, the memory 6 needs only this identification data area, so that the
It shall be 4 bits. The mahjong tile reading devices 21 to 24 are arranged on all sides of the mahjong table where the player is located, and the result read by each mahjong tile reading device is given to the determination device 25. The judging device 25 displays and judges the score of each person based on the read mahjong tile data, and the judgment result is displayed by the ascending hand / score display device 26.

FIG. 7A shows an example of identification data of four mahjong tiles and their identification data areas. In this data sequence, hexadecimal numbers are used to simplify the display. When the four mahjong tiles are read simultaneously by the mahjong tile reading device, the read data is as shown in FIG. 7B, and it can be identified that the above four tiles are present. In this way, each player simply arranges the acquired predetermined number of mahjong tiles at predetermined positions, and the reading devices 21 to 24 identify them and determine the winning combination and the score by the determining device 25,
It can be displayed on the ascending hand / point display device 26.

In the first embodiment, the reader / writer 11 is used. However, if the data carrier is simply identified, it is necessary to have a writing function for writing data in the memory of the data carrier. There is no. Further, in this embodiment, when reading data from a data carrier, the carrier is intermittently switched at a constant duty ratio, and data is read from the data carrier depending on the presence or absence of reverberation while the carrier is stopped. The present invention is not limited to such a communication system, but can be applied to other communication systems such as FSK.

[0021]

As described above in detail, according to the present invention, even when a plurality of data carriers are in the communication area at the same time, only by reading the identification data area of each data carrier, it is possible to shorten the time. The effect is obtained that the data carrier in the communication area can be identified based on the data in the identification data area. According to the second aspect of the present invention, by using the first aspect of the invention for the identification system of mahjong tiles, it is possible to easily identify the mahjong tiles acquired by the player and to display information such as climbs and scores.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a contactless identification system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a memory area of a data carrier according to the embodiment.

FIG. 3 is a diagram showing data in identification data areas of eight data carriers according to the embodiment.

FIG. 4A is a flowchart illustrating an operation of the reader / writer according to the embodiment when identifying a data carrier;
(B) is a flowchart showing the operation of the data carrier.

FIG. 5 is a waveform diagram showing an output of a reader / writer at the time of data carrier identification, an output from each data carrier, and received data thereof.

FIG. 6A is a diagram illustrating an arrangement state of a mahjong tile reading device according to a second embodiment, and FIG. 6B is a block diagram illustrating an entire configuration thereof.

FIG. 7 is a diagram showing an example of a mahjong tile and identification data set for the tile.

FIG. 8 is an explanatory diagram in the case of identifying a plurality of data carriers in a conventional contactless identification system.

[Explanation of symbols]

 1, 1-1 to 1-8 Data carrier 2 Resonant circuit 3 Rectifier circuit 4 Shunt circuit 5 Data communication means 6 Memory 11 Reader / writer 12 Controller 13 Transmitting circuit 14 Receiving circuit 21 to 24 Mahjong tile reading device 25 Judgment device 26 .Point display device

Claims (2)

[Claims] 1. A contactless identification system comprising a data carrier and a reader for reading data from the data carrier, wherein the data carrier comprises: a memory having an identification data area; and a memory having an identification data area. Data communication means for reading an identification data area, wherein the identification data area of the memory differs from other data carriers only in the logical level of at least one unique bit in the data carrier group to be identified. The logical level of other bits is set to be common to all data carriers. The reader reads the identification data area of the data carrier when identifying the data carrier, and reads the identification data area in the communication area by the identification data. A non-contact identification system for identifying a data carrier. 2. A mahjong tile identification system comprising a mahjong tile and a mahjong tile reading device, wherein the mahjong tile has a data carrier attached to each of the mahjong tile and a memory having an identification data area. Data communication means for reading an identification data area of the memory in response to a response command, wherein the identification data area of the memory has a logical level of at least one unique bit in a data carrier group to be identified. Only the other data carriers and the logic level of the other bits are set to be common to all the data carriers, and the mahjong tile reading device sets the mahjong tile data carrier when identifying the data carrier. Reading the identification data area of the data carrier and identifying the mahjong tiles in the communication area by the identification data. Mahjong tiles identification system that.