JP5021702B2 - Wireless tag reading system, host, and wireless tag reading device - Google Patents

Description

  The present invention relates to a wireless tag reading system, a host, and a wireless tag reading device.

  When receiving a reading start command from a host, a wireless tag reader such as an RFID (Radio Frequency Identification) reader repeatedly reads the wireless tag until receiving a reading stop command (see, for example, Patent Document 1). The wireless tag reader notifies the host of data such as a tag ID read from the wireless tag periodically or in response to a request from the host. In addition, when the wireless tag reader notifies all the data to the host, the wireless tag reader again reads the wireless tag and accumulates the read data in its own device.

  By the way, if the wireless tag reader repeatedly executes reading of the wireless tag, almost the same data is repeatedly read from the wireless tag when the wireless tag is stationary. Here, the data to be read is almost the same because the radio wave transmitted from the antenna is unstable and all data cannot be read from the wireless tag every time, or multiple wireless tags are placed on the antenna. This is because not all wireless tags may enter the radio wave radiation area of the antenna.

  Therefore, each time the data read repeatedly by the wireless tag reader is notified, the host receives a large amount of data from the wireless tag wireless device. Further, the host needs to check whether there is any overlap between the data read by the wireless tag reader at the first time and the data read by the wireless tag reader at the second time. Such a large amount of data reception and data duplication check processing uses a large amount of resources such as CPU (Central Processing Unit), which is the main part of the host, and the entire host processing capacity such as screen display processing. There is a problem that there is a possibility of lowering.

  The present invention has been made in view of the above, and an object thereof is to provide a wireless tag reading system, a host, and a wireless tag reading device that can reduce processing of the wireless tag reading device and the host.

In order to solve the above-described problems and achieve the object, the present invention provides a wireless tag reader that reads a tag ID of the wireless tag via an antenna that transmits and receives signals to and from the wireless tag, and the wireless tag reader. A wireless tag reading system having a host that receives the read tag ID, wherein the host determines the number of wireless tags that do not overlap among the wireless tags from which the wireless tag reader reads the tag ID. and transmitting means for transmitting the read command to the wireless tag reader to specify, and a receiving means for receiving the number of the wireless tag from the wireless tag reader which does not overlap among the radio tag read the tag ID The wireless tag reader includes a receiving unit that receives the read command from the host, and a wireless tag that has read the tag ID. The number of the wireless tag does not Chi overlap, when the read command received has reached the number specified, all of the tag ID read from the wireless tag does not overlap with that sent to the host, the tag ID When the number of wireless tags that do not overlap among the wireless tags that read the tag has not reached the number specified by the read command, the number of wireless tags that do not overlap among the wireless tags that read the tag ID is And a transmission means for transmitting to the host .

Further, the present invention provides a wireless tag reader that reads a tag ID of the wireless tag via an antenna that receives a signal with the wireless tag, and the wireless tag reader does not overlap among the wireless tags from which the tag ID is read. transmitting means for sending a read command to specify the number of wireless tags, which receives the tag ID of the radio tag which does not overlap the specified number by the read command from the wireless tag reader, the RFID tag reader Receiving means for receiving, from the wireless tag reader, the number of wireless tags that do not overlap among the wireless tags that have read the tag ID while the tag ID of the wireless tag is being read. It is characterized by.

Further, the present invention provides an antenna that transmits and receives a signal to and from a wireless tag, a reading unit that reads a tag ID from the wireless tag via the antenna, and a wireless tag that does not overlap among the wireless tags that read the tag ID by the reading unit. Receiving means for receiving a read command for designating the number of radio tags from the host, and the number of radio tags that do not overlap among the radio tags that have read the tag ID have reached the number designated by the received read command. The tag IDs read from the non-overlapping radio tags are transmitted to the host, and the number of non-overlapping radio tags among the radio tags from which the tag IDs are read is specified by the read command. The wireless tag that does not overlap among the wireless tags that have read the tag ID Characterized by comprising transmission means for transmitting the number to the host, the.

  The wireless tag reading system, the host, and the wireless tag reading device according to the present invention have an effect that the processing of the wireless tag reading device and the host can be reduced.

FIG. 1 is a diagram showing a configuration of a wireless tag reading system according to an embodiment of the present invention. FIG. 2 is a diagram illustrating a configuration example of an antenna included in the wireless tag reader. FIG. 3 is a block diagram illustrating a hardware configuration of the wireless tag reader. FIG. 4 is a block diagram illustrating a hardware configuration of the host. FIG. 5 is a block diagram showing a functional configuration of the wireless tag reader and the host. FIG. 6 is a flowchart showing a flow of tag ID transmission processing. FIG. 7 is a flowchart showing a flow of tag ID transmission processing.

  Exemplary embodiments of a wireless tag reading system, a host, and a wireless tag reading device according to the present invention are explained in detail below with reference to the accompanying drawings.

  FIG. 1 is a diagram showing a configuration of a wireless tag reading system according to an embodiment of the present invention. The wireless tag reading system 1 of this embodiment includes a wireless tag reading device 104 that reads a tag ID of the wireless tag 100 and a tag read by the wireless tag reading device 104 via an antenna 101 that transmits and receives signals to and from the wireless tag 100. A host 105 (for example, PC: Personal Computer, POS (Point Of Sale) terminal, etc.) that receives the ID is included.

  In the wireless tag reader 104, the antenna 101 is connected to the main body 102 via the coaxial cable 103. Note that the wireless tag 100 to be read is actually attached to an article such as a postal item, an envelope, or a document, but only the wireless tag 100 is shown and described in this specification for the sake of simplicity.

  FIG. 2 is a diagram illustrating a configuration example of an antenna included in the wireless tag reader.

  The antenna 101 has a loop shape as shown in FIG. More specifically, the antenna 101 is a device in which a circular loop made of a conductor formed on a substrate is divided into a plurality of parts, and the gap is connected by a capacitor 201 to obtain a desired resonance frequency. Since an unbalanced coaxial cable is normally connected to the feed point 202, an unbalance-balance conversion balun 203 is provided.

  If the magnetic field reader antenna for RFID in the UHF band, which is now widely used, the loop has a diameter of about 10 cm and each capacitor 201 has a capacity of about 1 pF. The resonance frequency can be adjusted to 953 MHz which is the center of the frequency band. However, since the resonance frequency changes depending on the substrate to be used and the surrounding environment, the loop diameter, the number of loop divisions, the capacitance value of the capacitor 201 to be used, and the like need to be adjusted as appropriate. In the present embodiment, the above general magnetic field type reader antenna is used as the antenna 101.

  In this embodiment, a magnetic reader antenna is used as the antenna 101, but the present invention is not limited to this. For example, a so-called patch antenna that is often used conventionally can also be used as the antenna 101. By the way, a linearly polarized patch antenna is a power supply for resonating by arranging a square conductor pattern of about ½ wavelength on a substrate having a layer structure in which a conductor pattern and a ground conductor face each other across a dielectric. It is formed by providing a part (not shown).

  FIG. 3 is a block diagram illustrating a hardware configuration of the wireless tag reader. The wireless tag reader 104 includes a CPU 301, a ROM 302, a RAM 303, an output DA converter 304, a PLL 305, a power amplifier 306, a digital modulator / demodulator 307, an LNA 308, a thermistor 309, a communication control unit 310, an AD converter 311, and the like.

  A CPU (Central Processing Unit) 301 is a main part of the RFID tag reader 104 and controls each part centrally. A ROM (Read Only Memory) 302 is a read-only memory that stores various programs such as an OS (Operating System). A RAM (Random Access Memory) 303 stores various data in a rewritable manner. The output DA converter 304 converts a digital signal output to the host 105 or the like into an analog signal. A PLL (Phase Locked Loop) 305 is an electronic circuit that matches a reference frequency of a signal input into the own apparatus with a frequency of a signal output from the own apparatus. The thermistor 309 detects the temperature in the device itself. The power amplifier 306 amplifies a signal received from the wireless tag 100 via the antenna 101, a detection signal of the thermistor 309, and the like. An LNA (Low Noise Amplifier) 308 amplifies a signal received from the wireless tag 100 via the antenna 101 and a detection signal of the thermistor 309, and is an amplifier having a low noise figure applied to the first stage of the own device. . The AD converter 311 converts an analog signal input from the host 105, a signal received from the wireless tag 100 via the antenna 101, a detection signal of the thermistor 309, and the like into a digital signal. The digital modulator / demodulator 307 modulates / demodulates the signal converted into a digital signal by the AD converter 311. The communication control unit 310 manages communication with the host 105 in accordance with RS232C.

  FIG. 4 is a block diagram illustrating a hardware configuration of the host. The host 105 includes a CPU 401, a ROM 402, a RAM 403, an output DA converter 404, a digital modulator / demodulator 405, an AD converter 406, a communication control unit 407, and the like.

  The CPU 401 is a main part of the host 105 and centrally controls each part. The ROM 402 is a read-only memory that stores various programs such as an OS. The RAM 403 stores various data in a rewritable manner. The output DA converter 404 converts a digital signal output to the wireless tag reader 104 or the like into an analog signal. The AD converter 406 converts an analog signal or the like input from the wireless tag reader 104 into a digital signal. The digital modulator / demodulator 405 modulates / demodulates the signal converted into a digital signal by the AD converter 406. The communication control unit 407 manages communication with the wireless tag reading device 104 in accordance with RS232C.

  Next, among the functions that the various programs stored in the ROMs 302 and 402 of the wireless tag reader 104 and the host 105 cause the CPUs 301 and 401 to execute, the wireless tag reader 104 and the host 105 according to the present embodiment have the characteristic features. Explain the various functions.

  FIG. 5 is a block diagram showing a functional configuration of the wireless tag reader and the host. As shown in FIG. 5, the wireless tag reader 104 implements a reading unit 501, a receiving unit 502, a transmitting unit 503, and the like by following various programs. Further, as shown in FIG. 5, the host 105 realizes a transmission unit 504, a reception unit 505, and the like by following various programs.

  First, each unit of the wireless tag reader 104 will be described.

  The receiving means 502 receives a tag reading start command (RD, START), which is a command for instructing reading start of the tag ID, and a tag reading stop command (RD, STOP) instructing to stop reading of the tag ID via the communication control unit 310. ), A read command (RD, a: 30) for designating the number of non-overlapping wireless tags 100 for reading the tag ID, and the like are received from the host 105.

  When the receiving unit 502 receives a tag reading start command (RD, START) from the host 105, the reading unit 501 reads the tag IDs (000001, 000002,..., 000030) from the wireless tag 100 via the antenna 101. . The reading unit 501 accumulates the read tag ID in a storage medium such as the RAM 303. If the read tag ID is the same as the tag ID already stored in the RAM 303, the reading unit 501 does not store the tag ID in the RAM 303. That is, only the tag IDs of the wireless tags 100 that are not duplicated are stored in the RAM 303. Furthermore, each time the reading unit 501 reads a tag ID that is a tag ID of the wireless tag 100 and is different from the tag ID stored in the RAM 303, the number of non-overlapping wireless tags 100 that read the tag ID (hereinafter referred to as the tag ID) The number of read sheets Z is incremented. The number of read sheets Z is stored in a storage medium such as the RAM 303. The reading unit 501 repeats reading the tag ID from the wireless tag 100 until the receiving unit 502 receives a tag reading stop command (RD, STOP) from the host 105.

  When the number of read sheets Z reaches the number a specified by the read command received from the host 105 by the receiving unit 502, the transmitting unit 503 transmits the tag ID (that is, the tag ID stored in the RAM 303 via the communication control unit 310). , All tag IDs (RD, d: 000001, d: 000002, ..., d: 000030) read from the non-overlapping wireless tags 100 are transmitted to the host 105. Further, the transmission unit 503 clears the number of read sheets Z when the tag ID is transmitted to the host 105. The transmission unit 503 transmits the read number Z to the host 105 when the read number Z has not reached the number a specified by the read command received from the host 105 by the receiving unit 502.

  Next, each unit of the host 105 will be described.

  The transmission unit 504 sends a tag reading start command (RD, START), a tag reading stop command (RD, STOP), a read command (RD, a: 30) to the wireless tag reading device 104 via the communication control unit 407. To be sent.

  The receiving unit 505 is configured to collectively receive, from the wireless tag reading device 104, the tag IDs of the wireless tags 100 that are not duplicated as specified by the read command via the communication control unit 407. Further, the receiving unit 505 receives the number of read sheets Z from the wireless tag reading device 104 via the communication control unit 407.

  Here, a case where the tag ID of the wireless tag 100 embedded in a postal matter or the like is read at a post office or the like will be described.

  When reading the tag ID of the wireless tag 100 embedded in the mail piece by the wireless tag reader 104 connected to the host 105 (POS terminal), first, the user uses an input device (not shown) included in the host 105 via The number a (for example, a: 5) of non-overlapping wireless tags 100 that read the tag ID is input to the host 105. Then, the transmission unit 504 transmits a tag reading start command (RD, START) to the wireless tag reading device 104.

  Further, the transmission unit 504 transmits a read command (RD, a: 5) to the wireless tag reading device 104 every predetermined time. Note that the transmission unit 504 designates a value (for example, 100) that is sufficiently larger than the number of wireless tags 100 to be read when the number a of non-overlapping wireless tags 100 that read the tag ID is not input by the user. A read command (RD, a: 100) is transmitted to the wireless tag reader 104. When the reading number Z received from the wireless tag reading device 104 by the receiving unit 505 is stable (that is, when the reading number Z received from the wireless tag reading device 104 does not increase), the transmitting unit 504 A read command (RD, a: 5) for designating the number Z is transmitted to the wireless tag reading device 100.

  When the receiving unit 502 receives a tag reading start command (RD, START), the reading unit 501 starts reading the tag ID of the wireless tag 100. Next, when the reception unit 502 receives the read command (RD, a: 5), the transmission unit 503 indicates that the number of read sheets Z stored in the RAM 303 is the number of non-overlapping wireless tags 100 specified by the received read command. It is determined whether or not “5” is reached. If the read number Z has not reached “5” (for example, if the read number Z is “3”), the transmission unit 503 transmits the read number Z to the host 105. Furthermore, when the receiving unit 502 receives the read command (RD, a: 5) again, and the number of read sheets Z has reached “5”, which is the number of non-overlapping wireless tags 100 specified by the received read command, transmission is performed. The means 503 transmits the read tag IDs of five non-overlapping wireless tags 100 to the host 105.

  The receiving unit 505 receives the reading number Z (for example, “3”) transmitted from the wireless tag reading device 104. Further, the receiving unit 505 collectively receives the five tag IDs transmitted from the wireless tag reading device 104.

  Next, the flow of tag ID transmission processing by the wireless tag reader 104 will be described with reference to FIG. FIG. 6 is a flowchart showing a flow of tag ID transmission processing.

  First, the receiving unit 502 determines whether or not the reading unit 501 is reading the tag ID of the wireless tag 100 (step S601). If the tag ID has not been read (step S601: No), the receiving unit 502 waits for reception of a tag read command (step S602). When the tag reading command is received (step S602: Yes), the receiving unit 502 clears the reading number Z (step S603). Subsequently, the reading unit 501 starts reading the tag ID of the wireless tag 100 via the antenna 101 (step S604).

  On the other hand, when the tag ID is being read (step S601: Yes), the reading unit 501 increments the reading number Z every time the tag ID of the wireless tag 100 that does not overlap is read (step S605: Yes) (step S605: Yes). Step S606). Further, when the reception unit 502 receives the read command (step S607: Yes), the transmission unit 503 has reached the number a of the non-overlapping wireless tags 100 that read the tag ID specified by the received read command Z. Whether or not (step 608).

  Here, when the number of read sheets Z has not reached the number a of the wireless tags 100 that do not overlap each other for reading the tag ID specified by the read command (step S608: No), the transmission unit 503 transmits the number of read sheets Z to the host 105. (Step S609). On the other hand, when the number of read sheets Z has reached the number of wireless tags 100 that do not overlap each other for reading the tag ID specified by the read command (step S608: Yes), the transmission unit 503 determines whether the read number Z and the reading unit 501 All the tag IDs of the read non-overlapping wireless tags 100 are transmitted to the host 105 (step S610), and the number of read sheets Z is cleared (step S611).

  If a read command has not been received (step S607: No), the receiving unit 502 waits for reception of a tag reading stop command (step S612). When the tag reading stop command is received (step S612: Yes), the reading unit 501 stops reading the tag ID of the wireless tag 100 (step S613).

  In FIG. 6, the number of read sheets Z and the tag ID are transmitted after waiting for the reception of the read command. However, the tag ID transmission processing (FIG. 7). FIG. 7 is a flowchart showing a flow of tag ID transmission processing.

  First, the receiving unit 502 determines whether the reading unit 501 is reading the tag ID of the wireless tag 100 (step S701). If the tag ID has not been read (step S701: No), the receiving unit 502 waits for reception of a tag read command and a read command (step S702). When the tag read command and the read command are received (step S702: Yes), the receiving unit 502 clears the read number Z (step S703). Subsequently, the reading unit 501 starts reading the tag ID of the wireless tag 100 via the antenna 101 (step S704).

  On the other hand, when the tag ID is being read (step S701: Yes), the reading unit 501 increments the read number Z each time the tag ID of the wireless tag 100 that does not overlap is read (step S705: Yes) (step S705: Yes). Step S706). Next, when the tag reading stop command has not been received by the receiving unit 502 (step S707: No), the transmitting unit 503 reads the tag ID specified by the read command received by the number of read sheets Z. It is determined whether or not the number a has been reached (step 708).

  Here, when the number of read sheets Z has not reached the number a of the non-overlapping wireless tags 100 that read the tag ID specified by the read command (step S708: No), the transmission unit 503 transmits the number of read sheets Z to the host 105. (Step S709). On the other hand, when the number of read sheets Z has reached the number a of wireless tags 100 that do not overlap each other for reading the tag ID specified by the read command (step S708: Yes), the transmission unit 503 determines whether the read number Z and the reading unit 501 All the tag IDs of the read wireless tags 100 that do not overlap are transmitted to the host 105 (step S710), and the number of read sheets Z is cleared (step S711).

  If the tag reading stop command is received (step S707: Yes), the reading unit 501 stops reading the tag ID of the wireless tag 100 (step S712).

  As described above, according to the wireless tag reading system 1 according to the present embodiment, the tag ID is read from the wireless tag 100 via the antenna 101, and the number of non-overlapping wireless tags that have read the tag ID is received from the host 105. When the read command reaches the number specified, the number of times the host 105 performs the tag ID reception process can be reduced by transmitting to the host 105 all the tag IDs of the read non-overlapping wireless tags 100. Therefore, the processing of the wireless tag reader 104 and the host 105 can be reduced. Furthermore, the wireless tag reading system 1 can be realized by an inexpensive host 105 having a low processing capacity. Furthermore, the reading process of the wireless tag 100 and the process by other applications can coexist.

DESCRIPTION OF SYMBOLS 1 RFID tag reading system 100 RFID tag 101 Antenna 104 RFID tag reader 105 Host 501 Reading means 502,505 Reception means 503,504 Transmission means

JP 2006-277014 A

Claims (3)

A wireless tag reading system comprising: a wireless tag reader that reads a tag ID of the wireless tag via an antenna that transmits and receives signals to and from the wireless tag; and a host that receives the tag ID read by the wireless tag reader. Because
The host is
Transmitting means for transmitting a read command the wireless tag reader specifies the number of the radio tag the no wireless tag sac Chi duplicate reading the tag ID to the radio tag reader,
Receiving means for receiving, from the wireless tag reader, the number of wireless tags that do not overlap among the wireless tags that have read the tag ID;
With
The wireless tag reader is
Receiving means for receiving the read command from the host;
When the number of the wireless tags that do not overlap among the wireless tags that have read the tag ID has reached the number specified by the received read command, all the tag IDs read from the wireless tags that do not overlap When the number of wireless tags that are not duplicated among the wireless tags that have been transmitted to the host and read the tag ID has not reached the number specified by the read command, the wireless tag that has read the tag ID Transmitting means for transmitting the number of wireless tags that do not overlap to the host ;
A wireless tag reading system comprising: The wireless tag reading device that reads the tag ID of the wireless tag via an antenna that receives a signal with the wireless tag specifies the number of wireless tags that do not overlap among the wireless tags from which the wireless tag reading device reads the tag ID. and transmitting means for sending a read command to,
While receiving the tag IDs of the non-overlapping radio tags specified by the read command from the radio tag reader, the tag is being read while the tag ID of the radio tag is being read by the radio tag reader. Receiving means for receiving, from the wireless tag reader, the number of wireless tags that do not overlap among the wireless tags that have read IDs ;
A host characterized by comprising: An antenna for transmitting and receiving signals to and from the wireless tag;
Reading means for reading a tag ID from the wireless tag via the antenna;
Receiving means for receiving, from a host, a read command specifying the number of wireless tags that do not overlap among the wireless tags that read the tag ID by the reading means;
When the number of the wireless tags that do not overlap among the wireless tags that have read the tag ID has reached the number specified by the received read command, all the tag IDs read from the wireless tags that do not overlap When the number of wireless tags that are not duplicated among the wireless tags that have been transmitted to the host and read the tag ID has not reached the number specified by the read command, the wireless tag that has read the tag ID Transmitting means for transmitting the number of wireless tags that do not overlap to the host ;
A wireless tag reader characterized by comprising:

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