JP5003104B2 - Access device and program - Google Patents

Description

The present invention relates to an access device and a program for accessing an ID tag .

  Normally, when an access process such as data writing or reading is performed from the reader / writer device to the memory of the RFID tag, it is necessary to designate an RFID tag as an access destination in order to access only a specific RFID tag. Therefore, the command transmitted from the reader / writer device to the RFID tag includes a unique ID of the RFID tag itself (hereinafter referred to as UID (Unique Identification)) in order to indicate to which RFID tag the command is directed. Yes. Since this UID has a different value for each RFID tag, it is possible to determine which RFID tag the command is for.

  Thus, in order to access a specific RFID tag, it is necessary to know the UID of the RFID tag. In general, as shown in FIG. 14, when a command for acquiring the UID of the RFID tag 60 is transmitted from the reader / writer device 50, the UID of the RFID tag 60 is transmitted from the RFID tag 60 within the communication range 51. Is returned in the response to the command. In the example shown in FIG. 14, since there are six RFID tags 60 in the communication range 51, six UIDs are obtained. Then, the reader / writer device 50 selects the UID of the RFID tag 60 to be accessed from the returned six UIDs, and accesses the target RFID tag 60 using the UID.

  In addition, a UID, a barcode indicating the UID, or a two-dimensional code is printed on the RFID tag. For example, as an alternative when the ID electronically stored in the RFID chip cannot be recognized, the individual identification number is directly and physically displayed on the ID management individual in a human-readable form or barcode. It has been proposed (see, for example, Patent Document 1).

In addition, a technique has been proposed in which information to be written in the IC tag is printed as a barcode or a two-dimensional code on the front and back surfaces of the IC tag, and information read from the barcode or the two-dimensional code is written in the data area of the IC tag. (For example, refer to Patent Document 2).
JP 2005-25412 A JP 2005-222511 A

  However, when there are a plurality of RFID tags within the communication range, it is difficult to identify the UID of the RFID tag to be accessed from among the plurality of UIDs, and data is stored in the RFID tag memory different from the RFID tag to be accessed. There was a risk of erroneous operations such as writing.

  In order to select the UID of the RFID tag to be accessed, unless the UID is known in advance, the information printed on the surface of the RFID tag (for example, the UID, the product number, the individual product of the barcode) No.), it took time to select the UID of the RFID tag to be accessed.

  Furthermore, when the radio wave environment is bad, or when an error occurs in the reading process of a plurality of RFID tags (for example, when radio waves returned from the RFID tags collide with each other and normal data cannot be obtained from the RFID tags) The UID of the RFID tag that is desired to be accessed is not always obtained, and when the UID is selected, the UID of the RFID tag that is actually desired to be accessed may not be included in the options.

An object of the present invention is to reliably access an ID tag to be accessed .

Claim 1 of the present invention is a storage means for storing a plurality of identification information and a unique ID corresponding to each identification information, a reading means for optically reading image information of an ID tag to be accessed, and the reading means The identification information is obtained by recognizing the image information read in step 1, the identification means for identifying the unique ID corresponding to the identification information by searching the storage means by the obtained identification information, and the access to the ID tag obtaining means for obtaining a command indicating the contents is characterized by comprising a transmission means for transmitting by adding acquired command by the acquisition unit to the unique ID specified by the specifying unit.
According to a third aspect of the present invention, a reading unit that optically reads image information of an ID tag to be accessed, and a specification that identifies a unique ID of the ID tag based on the content of the image information read by the reading unit Means for determining based on the size of the image information read by the reading means, a determining means for determining the size of the transmission output at the time of command transmission, and an acquiring means for acquiring a command indicating the access content to the ID tag And a transmission means for adding the command acquired by the acquisition means to the unique ID specified by the specifying means and transmitting the transmission output determined by the determination means.

According to the present invention, it is possible to reliably access the ID tag to be accessed target.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the illustrated example.

[First Embodiment]
First, a first embodiment of the present invention will be described.
FIG. 1 shows a functional configuration of a reader / writer device 10 as an RFID tag access device according to the first embodiment. As shown in FIG. 1, a reader / writer device 10 includes a CPU (Central Processing Unit) 11, a RAM (Random Access Memory) 12, a ROM (Read Only Memory) 13, a communication unit 14, an antenna 15, a camera control unit 16, and a camera. 17, the display part 18, and the input part 19 are provided, and each part is electrically connected.

  The reader / writer device 10 performs access such as data writing or reading with respect to the RFID tag 20 whose outline configuration is shown in FIG. As shown in FIG. 2, the RFID tag 20 has a card shape and is formed in a size like a business card or a credit card, and a two-dimensional code 21 is described as an identification code indicating the UID of the RFID tag 20. ing. The two-dimensional code 21 represents data such as letters and numbers in a two-dimensional graphic pattern. The QR (Quick Response) code (registered trademark), Data Matrix (registered trademark), Maxi Code (registered trademark), PDF417 (registered trademark) and the like can be mentioned. The notation is only required to be visible by some method, and the two-dimensional code 21 may be directly printed on the surface of the RFID tag 20, or a seal or the like on which the two-dimensional code 21 is printed is RFID. The tag 20 may be affixed, or the two-dimensional code 21 may be stamped on the surface of the RFID tag 20. A plurality of RFID tags 20 exist, and a different UID is assigned to each RFID tag 20 in advance.

  The RFID tag 20 is not limited to the card shape as shown in FIG. 2, and may be, for example, a thin sheet-like label shape, a coin shape, a cylindrical shape, or a chip shape. In the embodiment, the RFID tag 20 has a size such as a business card or a credit card. However, the size of the RFID tag 20 is not limited to the embodiment, and may be an arbitrary size. It's okay.

  The CPU 11 reads out a designated program from various programs stored in the ROM 13, expands it in the RAM 12, and controls the processing operations of each part of the reader / writer device 10 in cooperation with the program expanded in the RAM 12. To control.

  The RAM 12 is a storage medium that temporarily stores data, and forms a work area that temporarily stores programs executed by the CPU 11, data being processed in each process, processing results, and the like.

  The ROM 13 stores various programs executed by the CPU 11 and data used for each process. For example, the ROM 13 stores a two-dimensional code analysis processing program for converting the two-dimensional code 21 to the UID.

The communication unit 14 transmits a command for accessing the RFID tag 20 via the antenna 15. As commands, for example, a command for instructing to write data transmitted together with the command to the RFID tag 20, a command for instructing to read data stored in the RFID tag 20, and a function of the RFID tag 20 being stopped. The command to instruct | indicate etc. is mentioned. In addition, the communication unit 14 receives a response to the command from the RFID tag 20 via the antenna 15.
The antenna 15 transmits and receives radio waves to and from the RFID tag 20.

The camera control unit 16 controls the shooting operation of the camera 17 in accordance with an instruction from the CPU 11 and outputs image data obtained by shooting to the CPU 11.
The camera 17 is a reading unit that optically reads the two-dimensional code 21 written on the RFID tag 20.

  The display unit 18 is configured by an LCD (Liquid Crystal Display) or the like, and displays an input screen corresponding to various instructions, results of various processes, and the like in accordance with instructions of display signals input from the CPU 11.

  The input unit 19 includes an input key for inputting an operation instruction, and outputs an operation signal indicating the pressed key to the CPU 11.

  The CPU 11 is an acquisition unit that analyzes the two-dimensional code 21 in the image data read from the RFID tag 20 by the camera 17 and acquires the UID of the RFID tag 20.

  In addition, the CPU 11 adds the UID acquired by analyzing the two-dimensional code 21 to the command and causes the communication unit 14 to transmit it. That is, a transmission unit is realized by the CPU 11 and the communication unit 14.

  FIG. 3 shows a functional configuration of the RFID tag 20. As shown in FIG. 3, the RFID tag 20 includes an antenna 22, a rectifier circuit 23, a power supply circuit 24, a demodulation circuit 25, a logic circuit 26, a nonvolatile memory 27, and a modulation circuit 28.

  The antenna 22 receives the radio wave transmitted from the reader / writer device 10. The antenna 22 transmits radio waves to the reader / writer device 10.

  The rectifier circuit 23 adjusts the waveform of the radio wave received by the antenna 22 and outputs it as a power supply current to the power supply circuit 24.

  The power supply circuit 24 supplies the power supply current input from the rectifier circuit 23 to each part of the circuit in the RFID tag 20.

  The demodulation circuit 25 extracts a waveform in which a command, data, or the like is modulated from the radio wave received by the antenna 22 and converts it into a format (binary number) that can be handled by the logic circuit 26.

  The logic circuit 26 executes the command content. For example, the nonvolatile memory 27 is accessed to write or read data.

  The non-volatile memory 27 is a memory that can hold data without power supply, such as an EEPROM (Electronically Erasable and Programmable Read Only Memory) or a FeRAM (Ferroelectric Random Access Memory). In the nonvolatile memory 27, the UID of the RFID tag 20 and other data are stored in advance. The nonvolatile memory 27 stores data written by the user using the reader / writer device 10.

  The modulation circuit 28 converts the data generated by the logic circuit 26 and transmitted to the reader / writer device 10 into a waveform for radio wave transmission.

Next, the operation of the first embodiment will be described with reference to FIG. FIG. 4 is a flowchart showing an access process A from the reader / writer device 10 to the RFID tag 20.
First, the user decides the RFID tag 20 to be accessed from a plurality of RFID tags 20. Then, the photographing direction of the camera 17 of the reader / writer device 10 is directed to the two-dimensional code 21 of the RFID tag 20, and the two-dimensional code 21 written on the RFID tag 20 is read by the camera 17 (step S1). Here, a case where the UID of the RFID tag 20 to be accessed is “1234” will be described as an example. That is, the two-dimensional code 21 written on the RFID tag 20 indicates the UID “1234” of the RFID tag 20.

  Next, the CPU 11 analyzes the two-dimensional code 21 in the image data obtained by the camera 17, and acquires the UID “1234” of the RFID tag 20 (step S2). The acquired UID is held in the RAM 12.

  Next, the access content to the RFID tag 20 is input from the input unit 19 by the user's operation (step S3). A corresponding command is predetermined for the access contents. FIG. 5A shows an example of data stored in the nonvolatile memory 27 of the RFID tag 20. As shown in FIG. 5A, the non-volatile memory 27 stores the UID “1234” of the RFID tag 20 in advance, “255” in the memory block 1, “128” in the memory block 2, The memory block 3 stores “0”, and the memory block 4 stores “88”. As the access contents, for example, a command (for example, “421”) instructing to write “1” into the memory block 2 of the nonvolatile memory 27 of the RFID tag 20 is input.

  Next, the CPU 11 adds the UID of the RFID tag 20 held in the RAM 12 to the command corresponding to the input access content, and the communication unit 14 transmits the command from the antenna 15 to the RFID tag 20. (Step S4). For example, the UID “1234” of the RFID tag 20 to be accessed is added to the command “421” instructing to write “1” in the memory block 2 and transmitted. By adding a different UID for each RFID tag 20 to the command transmitted from the reader / writer device 10, the RFID tag 20 to be accessed can be specified.

  In the RFID tag 20, a radio wave including a command transmitted from the reader / writer device 10 is received by the antenna 22 (step S 5), and a waveform in which a command, data, or the like is modulated is extracted from the received radio wave by the demodulation circuit 25. Then, it is converted into a format that can be handled by the logic circuit 26. On the RFID tag 20 side, since the UID is included in the command, it is possible to determine that it is an access command to the RFID tag 20 itself, not to other tags.

  Then, the command contents are executed by the logic circuit 26 (step S6). For example, when the command transmitted from the reader / writer device 10 is a command “421” instructing to write “1” into the memory block 2 of the nonvolatile memory 27, the logic circuit 26 causes the memory block 2 to be written. "1" is written in FIG. 5B shows an example of data stored in the nonvolatile memory 27 of the RFID tag 20 after execution of the command. As shown in FIG. 5B, the value of the memory block 2 of the nonvolatile memory 27 is changed to “1”.

  After executing the command, the modulation circuit 28 converts an acknowledgment (Ack) (for example, “1”) corresponding to the result of executing the command into a waveform for radio wave transmission, and transmits the waveform to the reader / writer device 10 through the antenna 22. (Step S7).

  In the reader / writer device 10, when the communication unit 14 receives Ack from the RFID tag 20 via the antenna 15 (step S8), the CPU 11 determines whether there is another command to be transmitted (step S8). S9). If there is another command to be transmitted (step S9; Yes), the process returns to step S3, and the processes of steps S3 to S9 are repeated.

  In step S9, when there is no other command to be transmitted (step S9; No), the access process A from the reader / writer device 10 to the RFID tag 20 ends.

  As described above, according to the reader / writer device 10 of the first embodiment, the two-dimensional code 21 written on the RFID tag 20 is read, the read two-dimensional code 21 is analyzed, and the UID is acquired. Since the acquired UID is added to the command and transmitted to the RFID tag 20, it is possible to easily identify the RFID tag 20 to be accessed and to access the RFID tag 20 efficiently. Since the access target is determined by reading the two-dimensional code 21 from the RFID tag 20 to be accessed, there is no need to know in advance the UID of the RFID tag 20 to be accessed as in the prior art, and a plurality of devices within the communication range of the reader / writer device 10 can be obtained. There is no need to select a UID from among the candidates.

  In addition, since the RFID tag 20 to be accessed is easy to understand, erroneous operation can be prevented. Further, in order to read the two-dimensional code 21 written on the RFID tag 20, since the RFID tag 20 is approached to some extent, the RFID tag 20 to be accessed can be surely placed within the communication range.

  Further, since the UID has already been added from the start of access to the RFID tag 20, it is possible to reduce access errors due to radio wave collisions from a plurality of tags. Even if there are a plurality of RFID tags 20 within the communication range, by adding a UID to the command, a tag having a UID different from the UID does not respond, so radio waves do not collide.

  In the first embodiment, the case where the two-dimensional code 21 is written on the RFID tag 20 has been described. However, a barcode may be written on the RFID tag 20 as an identification code indicating a UID. . In that case, the reader / writer device 10 may be provided with a laser scanner or the like capable of reading a barcode instead of the camera 17. When the RFID tag 20 has a UID character as an identification code indicating the UID, the UID may be decoded by a character recognition (OCR: Optical Character Reader) function. Further, a symbol may be written on the RFID tag 20 as an identification code indicating a UID.

  Further, in the flowchart shown in FIG. 4, the two-dimensional code 21 is read and then the access content to the RFID tag 20 is input. However, after all the commands to be executed first are input, the two-dimensional code 21 is input. It is good also as reading. In this case, if a plurality of commands are automatically and sequentially transmitted after the two-dimensional code 21 is read, a series of processes can be efficiently performed only by reading the two-dimensional code 21.

[Second Embodiment]
Next, a second embodiment to which the present invention is applied will be described.
In the first embodiment, the case where the two-dimensional code 21 that can be converted into the UID itself is described in the RFID tag 20 has been described. However, in the second embodiment, the RFID tag UID is included in the RFID tag. A case where an identification image associated with is described will be described.

  FIG. 6 shows a general configuration of the RFID tag 30 according to the second embodiment. As shown in FIG. 6, the RFID tag 30 has a card shape and is formed in a size like a business card or a credit card, and an identification image 31 as reference data is described. In the example shown in FIG. 6, “Shizuoka tea” included in the identification image 31 indicates a product name, and “34” indicates a serial number. The identification image 31 may be directly printed on the surface of the RFID tag 30, or a seal or the like on which the identification image 31 is printed may be affixed. A plurality of RFID tags 30 exist, and a different UID is assigned to each RFID tag 30 in advance.

  Note that the RFID tag 30 is not limited to the card shape as shown in FIG. 6, and may be, for example, a thin sheet-like label shape, a coin shape, a cylindrical shape, or a chip shape. In the embodiment, the RFID tag 30 has a size such as a business card or a credit card. However, the size of the RFID tag 30 is not limited to the embodiment, and may be an arbitrary size. It's okay.

  As shown in FIG. 7, EPC Global, which is an RFID standardization organization, consists of a version (8 bits), a manufacturer ID (28 bits), a product ID (24 bits), and a serial number (36 bits). It is prescribed. If the UID of the RFID tag conforms to this rule, the upper 60 bits (version, manufacturer ID, product ID) of the UID can be obtained from the product name, and if the serial number part is obtained, the entire UID Will be understood.

  In the reader / writer device as the RFID tag access device of the second embodiment, the same components as those of the reader / writer device 10 of the first embodiment shown in FIG. The illustration and description are omitted. In addition, the functional configuration of the RFID tag 30 in the second embodiment is the same as that of the RFID tag 20 in the first embodiment shown in FIG. However, illustration and description of the configuration are omitted. Hereinafter, a configuration and processing characteristic of the second embodiment will be described.

  The ROM 13 of the reader / writer device according to the second embodiment stores a character recognition processing program that performs character recognition of the identification image 31 and generates character information. In addition, as shown in FIG. 8, the ROM 13 stores a database 131 used when converting the product name into a part of the UID among the character information obtained by character recognition of the identification image 31. . In the database 131, a product name and a product code indicating a part of the UID are associated with each other. For example, a product code “11” is associated with the product name “Cola”, a product code “12” is associated with the product name “Shizuoka tea”, and a product code “13” is associated with the product name “water”. It has been.

  The camera 17 is an imaging unit that captures an image, and is a reading unit that captures and reads the identification image 31 written on the RFID tag 30.

  The CPU 11 is an acquisition unit that analyzes the captured identification image 31 and acquires the UID of the RFID tag 30. Specifically, the CPU 11 performs character recognition on the identification image 31 and divides character information obtained by character recognition into a product name and a serial number. Then, the database 131 is searched based on the product name, the product code corresponding to the product name is read from the database 131, and the read product code and serial number are combined to form a UID.

Next, the operation of the second embodiment will be described with reference to FIG. FIG. 9 is a flowchart showing an access process B from the reader / writer device to the RFID tag 30.
First, the user determines an RFID tag 30 to be accessed from a plurality of RFID tags 30. Then, the photographing direction of the camera 17 of the reader / writer device is directed to the identification image 31 of the RFID tag 30, and the identification image 31 written on the RFID tag 30 is photographed by the camera 17, and the image data is read (step S11). .

  Next, the CPU 11 analyzes the image data of the identification image 31 obtained by the camera 17 and performs character recognition (step S12). Then, the CPU 11 searches the database 131 in the ROM 13 based on the character information obtained by character recognition and converts it into a UID (step S13).

  Specifically, as shown in FIG. 6, when “Shizuoka tea 34” is described as the identification image 31 on the RFID tag 30, character information “Shizuoka tea 34” is obtained by character recognition, and the product name It is divided into “Shizuoka tea” and serial number “34”. Then, the database 131 is searched based on the product name “Shizuoka tea”, the product code “12” corresponding to “Shizuoka tea” is read from the database 131, the product code “12”, and the serial number “34”. “1234” combined with “” is acquired as the UID of the RFID tag 30. The acquired UID is held in the RAM 12.

  Steps S14 to S20 are the same as steps S3 to S9 in the first embodiment, and a description thereof will be omitted.

  As described above, according to the reader / writer device of the second embodiment, the identification image 31 written on the RFID tag 30 is read, the read identification image 31 is analyzed, the UID is acquired, and the acquired UID is acquired. Is added to the command and transmitted to the RFID tag 30. Therefore, the RFID tag 30 to be accessed can be easily identified, and the RFID tag 30 can be accessed efficiently. Since the access target is determined by reading the identification image 31 from the RFID tag 30 to be accessed, there is no need to know in advance the UID of the RFID tag 30 to be accessed as in the prior art, and a plurality of candidates within the communication range of the reader / writer device. There is also no need to select a UID from the list.

  Further, the RFID tag 30 to be accessed can be easily obtained by reading the product code corresponding to the product name from the database 131 in which the product name and the product code are associated, and acquiring the UID together with the product code and the serial number. Can be identified.

  In the second embodiment, the case where the reference data for referring to the UID is described as the identification image 31 has been described. However, the reference data is expressed as a two-dimensional code or barcode on the RFID tag. The UID corresponding to the reference data obtained by reading the two-dimensional code or barcode may be read from the database.

  In the second embodiment, the case where a part of the identification image 31 (“Shizuoka tea”) is converted into a part of the UID (“12”) has been described. It is good also as matching.

  In the second embodiment, the case where the identification image 31 is composed of characters has been described. However, the identification image may be composed of symbols, figures, or the like.

  In the second embodiment, the product code portion and the serial number are acquired simultaneously by performing character recognition. However, the product code portion and the serial number may be read separately. For example, since it is considered that the product code part is compatible with the barcode already used, if the barcode is printed, it is not necessary to print the entire UID, and only the serial number is added. do it. At the time of reading, the product code portion is obtained from the bar code, and then the portion corresponding to the serial number may be read.

[Third Embodiment]
Next, a third embodiment to which the present invention is applied will be described.
In the third embodiment, a case will be described in which a command is transmitted with an antenna output corresponding to the distance from the RFID tag.

  Since the RFID tag in the third embodiment has the same configuration as the RFID tag 20 in the first embodiment shown in FIG. 3, the same components are denoted by the same reference numerals, and the configuration is the same. The illustration and description are omitted. Further, a two-dimensional code 21 is written in the RFID tag in the third embodiment, as in the RFID tag 20 shown in FIG.

  FIG. 10 shows a functional configuration of a reader / writer device 40 as an RFID tag access device according to the third embodiment. As shown in FIG. 10, the reader / writer device 40 includes a CPU 11, a RAM 12, a ROM 13, a communication unit 14, antennas 15 a and 15 b, a camera control unit 16, a camera 17, a display unit 18, and an input unit 19. It is connected to the. In the reader / writer device 40, the same components as those of the reader / writer device 10 according to the first embodiment shown in FIG. Hereinafter, a configuration and processing characteristic of the third embodiment will be described.

  The antennas 15a and 15b are antennas having different communication ranges and can be switched. FIG. 11 shows a communication range 41a of the antenna 15a and a communication range 41b of the antenna 15b. The antenna 15b has directivity, is installed so that the radio wave radiation direction of the antenna 15b and the shooting direction 42 of the camera 17 substantially coincide, and only the RFID tag to be accessed exists in the communication range 41b. Used in. The communication range 41a of the antenna 15a is wider than the communication range 41b of the antenna 15b, and the antenna 15a can access a plurality of RFID tags existing in the communication range 41a.

  In the ROM 13, the size (length or area in a predetermined direction) of the two-dimensional code 21 in the image data obtained by photographing and the distance from the RFID tag are stored in association with each other. The smaller the two-dimensional code 21 in the image data, the longer the distance from the RFID tag, and the larger the two-dimensional code 21 in the image data, the shorter the distance from the RFID tag. Further, the ROM 13 stores a distance from the RFID tag and an antenna output necessary for transmitting a radio wave to the RFID tag existing at the distance in association with each other. The longer the distance from the RFID tag, the larger the antenna output, and the shorter the distance from the RFID tag, the smaller the antenna output. FIG. 12 shows an antenna output determination table 132 stored in the ROM 13. In the antenna output determination table 132, the size of the two-dimensional code 21 in the image data, the distance from the RFID tag, and the antenna output are stored in association with each other.

  The camera 17 is a reading unit that captures and reads the two-dimensional code 21 written on the RFID tag existing in the radio wave radiation direction of the antenna 15b.

  The CPU 11 is an acquisition unit that analyzes the two-dimensional code 21 in the image data read from the RFID tag by the camera 17 and acquires the UID of the RFID tag.

  In addition, the CPU 11 uses the RFID tag corresponding to the size of the two-dimensional code 21 from the antenna output determination table 132 stored in the ROM 13 based on the size of the two-dimensional code 21 in the image data photographed by the camera 17. And the distance from the RFID tag. That is, the camera 17 and the CPU 11 realize a function as a measurement unit that measures the distance from the RFID tag.

  Further, the CPU 11 reads the antenna output corresponding to the distance to the RFID tag from the antenna output determination table 132 stored in the ROM 13 based on the distance to the RFID tag, and the antenna of the antenna 15b when accessing the RFID tag. It is a determination means which determines as an output.

  In addition, when shooting is performed by the camera 17, the CPU 11 switches the antenna to be used to the antenna 15b, adds the UID acquired by analyzing the two-dimensional code 21 to the command, and determines the determined antenna output. Accordingly, the communication unit 14 is caused to transmit from the antenna 15b. Thus, in the reader / writer device 40, the antenna 15a is normally used, but the antenna 15b is used only when the UID is acquired by reading the two-dimensional code 21.

Next, the operation of the third embodiment will be described with reference to FIG. FIG. 13 is a flowchart showing an access process C from the reader / writer device 40 to the RFID tag.
First, the access content is input from the input unit 19 of the reader / writer device 40 by the user's operation (step S21).

  Next, the user determines an RFID tag to be accessed from a plurality of existing RFID tags. Then, the photographing direction of the camera 17 of the reader / writer device 40 is directed to the two-dimensional code 21 of the RFID tag, and the two-dimensional code 21 written on the RFID tag is read by the camera 17 (step S22).

  Next, the CPU 11 analyzes the two-dimensional code 21 in the image data obtained by the camera 17, and acquires the UID of the RFID tag (step S23). The acquired UID is held in the RAM 12.

  Next, the CPU 11 refers to the antenna output determination table 132 stored in the ROM 13 based on the size of the two-dimensional code 21 in the image data captured by the camera 17, and sets the size of the two-dimensional code 21. The distance from the corresponding RFID tag is read, and the distance (for example, 50 mm) from the RFID tag is measured (step S24).

  Next, the CPU 11 refers to the antenna output determination table 132 stored in the ROM 13 based on the distance from the RFID tag, and determines the antenna output (for example, 10 mW) of the antenna 15b corresponding to the distance from the RFID tag. (Step S25).

  Next, the antenna to be used is switched to the antenna 15b by the CPU 11, and the RFID tag UID held in the RAM 12 is added to the command corresponding to the access content input in step S21, and the communication unit 14 determines it. In response to the antenna output, a command is transmitted from the antenna 15b to the RFID tag (step S26).

  In the RFID tag, a radio wave including a command transmitted from the reader / writer device 40 is received by the antenna 22 (step S27), and a waveform in which a command, data, or the like is modulated is extracted from the received radio wave by the demodulation circuit 25. , And converted into a format that can be handled by the logic circuit 26. Then, the command contents are executed by the logic circuit 26 (step S28).

  After execution of the command, the modulation circuit 28 converts an acknowledgment (Ack) corresponding to the result of executing the command into a waveform for radio wave transmission, and transmits it to the reader / writer device 40 via the antenna 22 (step S29).

  In the reader / writer device 40, when Ack is received from the RFID tag by the communication unit 14 via the antenna 15b (step S30), the CPU 11 determines whether there is another command to be transmitted (step S31). ). If there is another command to be transmitted (step S31; Yes), the process returns to step S26, and the processes of step S26 to step S31 are repeated.

  In step S31, when there is no other command to be transmitted (step S31; No), the access process C from the reader / writer device 40 to the RFID tag ends.

  Here, the timing of inputting the access contents is set before reading the two-dimensional code 21 from the RFID tag. This is because when the command is input after obtaining the UID, the RFID tag receives the communication range 41b of the antenna 15b in the meantime. It is because there is a possibility of coming off from.

  As described above, according to the reader / writer device 40 of the third embodiment, the two-dimensional code 21 written on the RFID tag is read, the read two-dimensional code 21 is analyzed, and the UID is acquired and acquired. Since the UID added to the command is transmitted to the RFID tag, it is possible to easily identify the RFID tag to be accessed, and to efficiently access the RFID tag. Since the access target is determined by reading the two-dimensional code 21 from the RFID tag to be accessed, it is not necessary to know the UID of the RFID tag to be accessed in the conventional manner.

  In addition, since the command is transmitted from the antenna 15b having directivity according to the antenna output determined based on the distance from the RFID tag, the radio wave interference from the surrounding metal or another RFID tag is reduced and the power is reduced. Consumption can be reduced.

  In addition, since shooting for obtaining the UID also serves as shooting for measuring the distance, it is not necessary to perform shooting separately for distance measurement. Further, if the reference for measuring the distance is defined as a graphic indicating the UID (such as the outer shape of a two-dimensional code), there is no need to separately print a symbol for measuring the distance.

  In the third embodiment, the two-dimensional code 21 is described on the RFID tag. However, a barcode, a character, or a symbol is described as an identification code indicating the UID on the RFID tag. Also good. Moreover, it is good also as the identification image matched with UID being described similarly to 2nd Embodiment.

  In the third embodiment, the distance to the RFID tag and the antenna output are determined based on the antenna output determination table 132. However, the equations for calculating the distance to the RFID tag and the antenna output are as follows. It may be stored in advance.

  In the third embodiment, the distance from the RFID tag is obtained from the size of the two-dimensional code 21 in the captured image data. However, a distance sensor such as an infrared distance sensor or an ultrasonic distance sensor is used. It is good.

  The descriptions in the above embodiments are examples of the RFID tag access device according to the present invention, and the present invention is not limited to this. The detailed configuration and detailed operation of each part constituting the RFID tag access apparatus can be changed as appropriate without departing from the spirit of the present invention.

  As described above, the RFID tag access apparatus according to the present invention includes the reading unit that reads the identification code from the RFID tag on which the identification code indicating the unique ID is written, and the RFID tag that analyzes the read identification code and analyzes the read identification code. An acquisition means for acquiring the unique ID of the communication apparatus, and a transmission means for adding the acquired unique ID to a command and transmitting it to the RFID tag. Preferably, the identification code is a unique ID. The reading means optically reads the barcode or two-dimensional code written on the RFID tag, and the acquisition means reads the read barcode or two-dimensional code. The unique ID of the RFID tag is obtained by analysis.

  By configuring in this way, the barcode or two-dimensional code written on the RFID tag is read, and the read barcode or two-dimensional code is analyzed to obtain the unique ID. Can be identified.

  Preferably, the identification code is an identification image indicating a unique ID, the reading unit captures an identification image written on the RFID tag by an imaging unit, and the acquisition unit captures the captured identification image. And the unique ID of the RFID tag is acquired.

  With this configuration, the identification image written on the RFID tag is read, and the read identification image is analyzed to acquire the unique ID. Therefore, the RFID tag to be accessed can be easily identified.

  Preferably, the identification code is reference data for referring to a unique ID from a database, and the acquisition unit searches the database based on the read reference data, and the unique code corresponding to the reference data. The ID is read from the database.

  With this configuration, the unique ID corresponding to the reference data is read out from the database in which the reference data and the unique ID are associated with each other, so that the RFID tag to be accessed can be easily identified.

  Preferably, a measuring means for measuring a distance between the antenna having directivity and the RFID tag existing in a radio wave radiation direction of the antenna, and a determining means for determining the antenna output based on the measured distance. The transmission means transmits a command from the antenna according to the determined antenna output.

  With this configuration, a command is transmitted from a directional antenna according to the antenna output determined based on the distance from the RFID tag, so that radio interference from surrounding metal or another RFID tag can be prevented. As well as reducing power consumption.

It is a block diagram which shows the functional structure of the reader / writer apparatus 10 of 1st Embodiment. It is an outline block diagram of RFID tag 20 of a 1st embodiment. 2 is a block diagram showing a functional configuration of an RFID tag 20. FIG. 10 is a flowchart showing an access process A from the reader / writer device 10 to the RFID tag 20. (A) is an example of data stored in the nonvolatile memory 27 of the RFID tag 20 before command execution. (B) is an example of data stored in the nonvolatile memory 27 of the RFID tag 20 after execution of the command. It is a block diagram which shows the external appearance structure of the RFID tag 30 of 2nd Embodiment. It is a figure which shows the structure content of UID. It is a figure which shows the database 131 used when converting from a product name to a product code. 10 is a flowchart showing an access process B from the reader / writer device to the RFID tag 30; It is a block diagram which shows the functional structure of the reader / writer apparatus 40 of 3rd Embodiment. It is a figure which shows the communication range 41a of the antenna 15a and the communication range 41b of the antenna 15b. It is a figure which shows the antenna output determination table 132. FIG. It is a flowchart which shows the access process C from the reader / writer apparatus 40 to an RFID tag. It is a figure for demonstrating the access method to the RFID tag 60 in the conventional reader / writer apparatus 50. FIG.

Explanation of symbols

10 Reader / Writer Device 11 CPU
12 RAM
13 ROM
131 Database 132 Antenna Output Determination Table 14 Communication Unit 15, 15a, 15b Antenna 16 Camera Control Unit 17 Camera 18 Display Unit 19 Input Unit 20 RFID Tag 21 Two-Dimensional Code 22 Antenna 23 Rectifier Circuit 24 Power Supply Circuit 25 Demodulator Circuit 26 Logic Circuit 27 Nonvolatile memory 28 Modulation circuit 30 RFID tag 31 Identification image 40 Reader / writer device

Claims (6)

Storage means for storing a plurality of identification information and a unique ID corresponding to each identification information;
Reading means for optically reading image information of an ID tag to be accessed ;
Identifying means for recognizing the image information read by the reading means, identifying means for identifying the unique ID corresponding to the identification information by searching the storage means by the obtained identification information;
Obtaining means for obtaining a command indicating access contents to the ID tag;
Transmission means for transmitting by adding command acquired by the acquisition unit to the unique ID specified by the specifying unit,
An access device comprising: 2. The access apparatus according to claim 1, further comprising transmission output determining means for determining the magnitude of transmission output by the transmission means based on the size of image information read by the reading means. Reading means for optically reading image information of an ID tag to be accessed;
A specifying means for specifying the unique ID of the ID tag based on the content of the image information read by the reading means;
Determining means for determining the magnitude of the transmission output at the time of command transmission based on the magnitude of the image information read by the reading means;
Obtaining means for obtaining a command indicating access contents to the ID tag;
A transmission means for adding the command acquired by the acquisition means to the unique ID specified by the specifying means, and transmitting the transmission output determined by the determination means;
An access device comprising: The image information, the access device according to any one of claims 1-3, characterized in the Oh benzalkonium bar code or two-dimensional code. A program for controlling a computer of an access device that accesses an ID tag,
The computer,
Storage means for storing a plurality of identification information and a unique ID corresponding to each identification information;
Reading means for optically reading image information of an ID tag to be accessed;
Identification means for acquiring identification information by recognizing image information read by the reading means, and for identifying a unique ID corresponding to the identification information by searching the storage means with the acquired identification information;
An acquisition means for acquiring a command indicating access contents to the ID tag;
A transmission means for adding the command acquired by the acquisition means to the unique ID specified by the specification means and transmitting the unique ID;
A computer-readable program designed to function as a computer. A program for controlling a computer of an access device that accesses an ID tag,
The computer,
Reading means for optically reading image information of an ID tag to be accessed;
A specifying means for specifying a unique ID of the ID tag based on the content of the image information read by the reading means;
Determining means for determining the magnitude of the transmission output at the time of command transmission based on the magnitude of the image information read by the reading means;
An acquisition means for acquiring a command indicating access contents to the ID tag;
Transmitting means for adding the command acquired by the acquiring means to the unique ID specified by the specifying means, and transmitting the transmission output determined by the determining means;
A computer-readable program designed to function as a computer.

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