JP2007018067A - Rfid tag and rfid system - Google Patents

Rfid tag and rfid system Download PDF

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Publication number
JP2007018067A
JP2007018067A JP2005196255A JP2005196255A JP2007018067A JP 2007018067 A JP2007018067 A JP 2007018067A JP 2005196255 A JP2005196255 A JP 2005196255A JP 2005196255 A JP2005196255 A JP 2005196255A JP 2007018067 A JP2007018067 A JP 2007018067A
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Prior art keywords
antenna
rfid tag
ic chip
writer
reader
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JP2005196255A
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Japanese (ja)
Inventor
Naoji Yasui
直司 安井
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Kobayashi Kirokushi Co Ltd
小林記録紙株式会社
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Priority to JP2005196255A priority Critical patent/JP2007018067A/en
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Abstract

An object of the present invention is to make it possible to reliably read only the number of RFID tags even if a connection failure between an IC chip and an antenna occurs.
In an RFID tag, an IC chip having a memory, a conductive first antenna that is electrically connected to the IC chip, and an IC chip are electrically connected to the IC chip. When the data transmission method between the RFID tag 10 and the reader / writer 3 is an electromagnetic induction method, the second antenna 16 is a closed-loop coil antenna. The reflected wave generated in the resonant circuit 16-1 is received and detected by the antenna unit 4, and the number of RFID tags 10 is read on the reader / writer 3 side.
[Selection] Figure 3

Description

  The present invention relates to an RFID tag that performs non-contact data communication using electromagnetic waves, and an RFID system using the RFID tag.

  2. Description of the Related Art In recent years, RFID systems that perform various types of data communication using an RFID tag, a controller, a reader / writer, and an antenna unit are frequently used in the transportation, finance, or distribution industries. According to this system, it is possible to perform data communication between the reader / writer and the RFID tag in a non-contact manner by radiating electromagnetic waves controlled by the reader / writer according to instructions from the controller from the antenna unit toward the RFID tag. .

  By the way, in the distribution industry and the like, it is conceivable to collectively manage data of a plurality of products using the RFID system as described above. For example, an RFID tag may be attached to each product and accommodated in a cardboard box, and product data in the cardboard box may be collectively read using a single reader / writer.

  In such a case, if there is a connection failure between the IC chip mounted on the RFID tag and the antenna, data cannot be read accurately for the tag, and a reading error occurs. However, according to the conventional RFID system, when 10 RFID tag data is read on the reader / writer side, there are 10 RFID tags in the box and all 10 data are read, or There is a problem that it is impossible to distinguish whether only 10 pieces of data are read even though there are 11 or more RFID tags. Therefore, finally, the cardboard box must be opened, and the number in the box must be compared with the number read.

  On the other hand, in anticipation of poor connection between the IC chip and the antenna, a configuration in which a spare IC chip and an antenna are provided in the RFID tag is also conceivable. For example, Patent Document 1 below discloses a receiving antenna device in which a first antenna unit and a second antenna unit that are independent of each other are provided on a substrate. However, when an antenna with an IC chip is provided as a spare in an RFID tag in a similar manner, two expensive IC chips are used for one RFID tag. There is a disadvantage that the cost becomes high.

JP 2001-308636 A (refer to FIG. 1 in particular)

  The present invention has been made to solve the above-described problems. The object of the present invention is to reduce the manufacturing cost and reduce the number of RFID tags even if a connection failure occurs between the IC chip and the antenna. Is to provide an RFID tag that can be read reliably and can eliminate troublesome collation work, and an RFID system using the RFID tag.

  In order to achieve the above object, an RFID tag of the present invention includes an IC chip having a memory on an insulating base, a conductive first antenna electrically connected to the IC chip, and an IC chip. An electrically conductive second antenna that is electrically insulated is mounted.

  As a data transmission method between an RFID tag and a reader / writer, an electromagnetic induction method using a magnetic field generated in the reader / writer antenna unit and a radio wave method using a radio wave radiated from the reader / writer antenna unit are known. ing. Therefore, when the electromagnetic induction method is adopted, in the RFID tag of the present invention, the second antenna is preferably a resonant circuit composed of a closed loop coil antenna. On the other hand, when the radio wave system is adopted, the second antenna is preferably a surface acoustic wave element having comb electrodes facing each other.

  An RFID system according to the present invention includes the RFID tag attached to each of a plurality of products, and a reader / writer that radiates electromagnetic waves toward the RFID tag and performs data communication without contact. Data unique to each product is transmitted using signals transmitted and received between the first antenna and the reader / writer antenna unit, while the RFID tag second antenna transmits to the reader / writer antenna unit. The number of the plurality of products is read using a reflected wave or a surface acoustic wave transmitted toward the screen.

  According to the present invention, the second antenna mounted on the RFID tag is a chipless antenna that does not have an IC chip. Therefore, the manufacturing cost can be reduced and connection failure with the IC chip does not occur. The probability of failure is low and the reliability is higher than that of the first antenna. For this reason, even if data communication cannot be performed due to poor connection between the IC chip and the first antenna, the chipless second antenna does not cause a read error due to poor connection. Can be read.

  Therefore, it is not necessary to open the cardboard box and check the number of products and the number read by the RFID tag as in the conventional case, and it is not necessary to perform a troublesome checking work. Further, by comparing the number read by the first antenna with the number read by the second antenna, if the number read by the first antenna is smaller, it can be found that a failure of the first antenna has occurred.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 is a plan view showing an example of the RFID tag of the present invention, FIG. 2 is a sectional view of the RFID tag, FIG. 3 is an explanatory diagram showing an example of an RFID system using the RFID tag, and FIGS. It is a top view which shows the modification of the RFID tag of invention.

  As shown in FIGS. 1 and 2, in the RFID tag 10 of this embodiment, the outer periphery of the inlet sheet 11 is protected by an overlay sheet 12. In the inlet sheet 11, an IC chip 14, a first antenna 15, and a second antenna 16 are mounted on a base material 13, and the overlay sheet 12 includes a top sheet 17 and a back sheet 18.

  The base material 13 is made of an insulating material. For example, paper such as high-quality paper, coated paper, and synthetic paper, and synthetic resin such as polyethylene terephthalate (PET) and polypropylene (PP) can be used.

  The IC chip 14 is an electronic component that performs data communication processing with a reader / writer 3 to be described later. The IC chip 14 is fixed on the substrate 13 and includes a CPU, ROM, RAM, and EEPROM. The CPU is a central processing unit, analyzes a signal received from the antenna unit 4 of the reader / writer 3, executes processing, and transmits the execution result to the reader / writer 3. The ROM is a read-only memory in which an execution program for the CPU is stored, and the RAM is a working memory for temporarily storing data. The EEPROM is a non-volatile memory, and data communicated with the reader / writer 3 is stored in a rewritable manner.

  The first antenna 15 generates power for starting the CPU of the IC chip 14 and receives signals from the antenna unit 4 of the reader / writer 3. The first antenna 15 is electrically connected to the two terminals of the IC chip 14. It is formed of a conductive material. As the formation method, when the substrate 13 is made of paper, a method of screen printing a conductive ink containing silver paste, graphite, carbon or the like on the substrate 13 can be used. In addition, when the base material 13 is made of a synthetic resin, it is also possible to form a copper foil on the base material 13 and leave only the antenna portion by etching. Note that the substrate 13 and the IC chip 14 may be fixed and the electrical connection between the IC chip 14 and the first antenna 15 may be performed using a conductive adhesive.

  Like the first antenna 15, the second antenna 16 is made of a conductor formed by screen printing or etching. Unlike the first antenna 15, the second antenna 16 is electrically insulated from the IC chip 14. Since the second antenna 16 is a chipless antenna that does not have the IC chip 14, it is possible to reduce the manufacturing cost and the connection failure with the IC chip 14 does not occur. More reliable than one antenna 15.

  Here, as the shapes of the first antenna 15 and the second antenna 16, a shape suitable for the data transmission method between the reader / writer 3 and the RFID tag 10 is selected. In this embodiment, since the electromagnetic induction method is adopted as the data transmission method, as shown in FIG. 1, the shape of the first antenna 15 is a coil in which a coil end portion wound in a loop shape is connected to a terminal of the IC chip 14. The antenna 15-1 is provided. Moreover, the shape of the 2nd antenna 16 employ | adopts the resonant circuit 16-1 which consists of a coil antenna of a closed loop shape by connecting the coil ends wound in the shape of a loop. The resonance circuit 16-1 using the coil antenna is wired in a symmetrical position on the same plane as the first antenna 15 formed on the base material 13.

  Thus, the inlet sheet 11 in which the IC chip 14, the first antenna 15, and the second antenna 16 are mounted on the base material 13 is covered with the overlay sheet 12 on the front and back surfaces. That is, the inlet sheet 11 is protected from heat and water by being sandwiched between the top sheet 17 and the back sheet 18 made of synthetic resin such as polyethylene terephthalate (PET) or polypropylene (PP) and thermocompression bonded. . Although not shown, an adhesive may be applied to the overlay sheet 12 so that the RFID tag 10 can be attached.

  The above is the configuration of the RFID tag of the present embodiment. Next, an RFID system using this RFID tag will be described.

  The RFID system 1 shown in FIG. 3 attaches the RFID tags 10, 10,... Of the present embodiment to each of a plurality of products 20, 20,. Data specific to the product 20 and reading of the number of products 20 are performed without opening 30.

  The RFID system 1 shown in FIG. 1 is connected to a controller 2 that performs overall control of the entire system, a reader / writer 3 that reads and writes various data to and from the RFID tag 10 in accordance with instructions from the controller 2, and the reader / writer 3. And an antenna unit 4 that generates electromagnetic waves. Since the electromagnetic induction type RFID tag 10 is used in this embodiment, the antenna unit 4 uses a built-in loop coil antenna.

  In the RFID system 1 of the present embodiment, a signal current in a long wave band of 135 KHz or lower or a short wave band of 13.56 MHz is passed from the reader / writer 3 controlled by the controller 2 to the antenna unit 4 and is generated in the vicinity of the antenna unit 4 Power supply and data transmission to the RFID tag 10 are performed using a magnetic field.

  That is, as shown in the figure, when the cardboard box 30 is arranged in the vicinity of the antenna unit 4, the product 20 attached with the RFID tag 10 in the cardboard box 30 enters the magnetic field generated from the antenna unit 4. . At this time, in the first antenna 15 of the RFID tag 10, the coil antenna 15-1 resonates to generate an induced voltage due to resonance at the coil end, which causes power to be supplied to the IC chip 14 connected to the coil antenna 15-1. Is supplied and the internal CPU is activated.

  Here, transmission of unique data such as the price and serial number of the product 20 is performed by the IC chip 14 and the first antenna 15 of the RFID tag 10. That is, on the reader / writer 3 side, the electromagnetic wave carried in the magnetic field is modulated with a digital signal, and the modulated signal is transmitted from the antenna unit 4. On the other hand, the receiving-side RFID tag 10 receives a signal via the coil antenna 15-1, demodulates the signal, and extracts data to perform a predetermined process. Note that data unique to each product 20 received by the RFID tag 10 can be written in an EEPROM inside the IC chip 14.

  On the other hand, the number of products 20, 20,... Is read by the second antenna 16 of the RFID tag 10. When the RFID tag 10 enters the magnetic field generated from the antenna unit 4 as described above, the second antenna 16 generates an induced voltage due to resonance in the resonance circuit 16-1 including a coil antenna. A current flows through 1 and a magnetic field is generated and emitted. When this re-radiated magnetic field (referred to as a reflected wave) is received by the antenna unit 4 and amplified and detected, the passage of the RFID tag 10 can be detected on the reader / writer 3 side.

  As described above, according to this embodiment, even if data communication cannot be performed due to poor connection between the IC chip 14 and the first antenna 15, the chipless second antenna 16 does not cause a reading error due to poor connection. The number of RFID tags 10, 10,... Can be reliably read on the writer 3 side.

  Therefore, it is not necessary to open the corrugated cardboard box 30 and collate the number of products 20 with the number read by the RFID tag 10 as in the prior art, so that troublesome collation work is not required. Further, in the RFID tag 10, the number read by the first antenna 15 and the number read by the second antenna 16 are compared, and if the number read by the first antenna 15 is smaller, the first antenna 15 There is also an advantage that it is possible to find out that a failure has occurred.

  The RFID tag 10 described above is an example in which the electromagnetic induction method is adopted as the data transmission method of the first antenna 15 and the second antenna 16, but the data transmission method of the first antenna 15 and the second antenna 16 is a radio wave method. May be adopted.

  The RFID tag 10 shown in FIG. 4 employs a radio wave system. In this case, the shape of the first antenna 15 is changed to the coil antenna 15-1, and a pair of linear elements are connected to the two terminals of the IC chip 14. Dipole antenna 15-2. In addition, regarding the shape of the second antenna 16, a surface acoustic wave element 16-2 in which a pair of comb electrodes face each other is employed instead of the resonance circuit 16-1 including a coil antenna. The surface acoustic wave element 16-2 using the comb-shaped electrodes is also wired in the left-right symmetrical position on the same plane as the first antenna 15 on the substrate 13. In the case of the radio wave system, the antenna unit 4 of the reader / writer 3 is also a dipole antenna instead of the coil antenna.

  In this radio wave system, a radio wave having a high frequency in the UHF band of 915.0 MHz or the microwave band of 2.45 GHz is radiated from the antenna unit 4 of the reader / writer 3, and the high frequency radio wave is used to transmit to the RFID tag 10. Power supply and data transmission.

  That is, when the cardboard box 30 is disposed in the vicinity of the antenna unit 4, the product 20 with the RFID tag 10 in the cardboard box 30 enters the radio wave range radiated from the antenna unit 4. At this time, in the first antenna 15 of the RFID tag 10, an electromotive force is generated by rectification in the dipole antenna 15-2, whereby electric power is supplied to the IC chip 14 connected to the dipole antenna 15-2 and the internal CPU Starts.

  Here, transmission of data unique to the product 20 is performed by the IC chip 14 and the first antenna 15 of the RFID tag 10. In other words, when the reader / writer 3 on the transmission side transmits a modulated signal from the antenna unit 4 using high-frequency radio waves, the RFID tag 10 on the reception side receives the signal via the dipole antenna 15-2 and demodulates the signal. Then, a predetermined process is performed by extracting the data. Note that data unique to each product 20 received by the RFID tag 10 is written in an EEPROM inside the IC chip 14.

  On the other hand, the number of products 20, 20,... Is read by the second antenna 16 of the RFID tag 10. When the RFID tag 10 enters the radio wave range radiated from the antenna unit 4 as described above, high-frequency radio waves are applied to the surface acoustic wave element 16-2 formed of comb-shaped electrodes in the second antenna 16, and the substrate 13 is caused by the piezoelectric effect. Displacement occurs on the surface of the film, and sound waves called surface acoustic waves are generated. The generated surface acoustic wave propagates along the surface of the substrate 13, and when it reaches the output electrode, it is converted into an electromagnetic wave response signal and transmitted to the reader / writer 3. By receiving this electromagnetic wave response signal by the antenna unit 4, it is possible to detect passage of the RFID tag 10 on the reader / writer 3 side.

  Thus, even when the surface acoustic wave element 16-2 is employed as the second antenna 16, there is no connection with the IC chip 14 and no reading error due to poor connection occurs. Therefore, the RFID tag 10, The number of 10, ... can be read reliably.

  The RFID tag 10 described above is an example in which the data transmission method of the first antenna 15 and the second antenna 16 is common, but the data transmission method of the first antenna 15 and the second antenna 16 may be different. Is possible. For example, as shown in FIG. 5, a configuration may be employed in which the first antenna 15 is an electromagnetic induction type coil antenna 15-1 and the second antenna 16 is a radio wave type surface acoustic wave element 16-2. On the contrary, as shown in FIG. 6, a configuration is adopted in which the first antenna 15 is a radio wave type dipole antenna 15-2 and the second antenna 16 is an electromagnetic induction type resonance circuit 16-1. You can also.

  The embodiment described above is an example in which the product attached with the RFID tag of the present invention is accommodated in a cardboard box, and the unique data of the RFID tag is transmitted and the number is read without opening the cardboard box. The present invention is not limited to this. For example, the present invention can also be used when collectively reading the price and number of products with RFID tags placed in a shopping cart at a cash register.

The top view which shows an example of the RFID tag of this invention. (Ii)-(ii) sectional view taken on the line in FIG. Explanatory drawing which shows an example of the RFID system using the RFID tag of this invention. The top view which shows the modification of the RFID tag of this invention. The top view which shows the modification of the RFID tag of this invention. The top view which shows the modification of the RFID tag of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 RFID system 2 Controller 3 Reader / writer 4 Antenna unit 10 RFID tag 11 Inlet sheet 12 Overlay sheet 13 Base material 14 IC chip 15 1st antenna 15-1 Coil antenna 15-2 Dipole antenna 16 2nd antenna 16-1 Resonant circuit 16 -2 Surface acoustic wave device 17 Surface sheet 18 Back sheet 20 Product 30 Cardboard box

Claims (4)

  1.   An IC chip having a memory on an insulating base, a conductive first antenna electrically connected to the IC chip, and a conductive second antenna electrically insulated from the IC chip, An RFID tag characterized by being mounted.
  2.   The RFID tag according to claim 1, wherein the second antenna is a resonant circuit including a closed loop coil antenna.
  3.   2. The RFID tag according to claim 1, wherein the second antenna is a surface acoustic wave element having comb electrodes facing each other.
  4. The RFID tag according to any one of claims 1 to 3, which is attached to each of a plurality of products, and a reader / writer that radiates electromagnetic waves toward the RFID tag and performs data communication in a contactless manner.
    Data specific to each individual product is transmitted using signals transmitted and received between the first antenna of the RFID tag and the antenna unit of the reader / writer, while the reader / writer of the reader / writer is transmitted from the second antenna of the RFID tag. An RFID system, wherein the number of the plurality of products is read using a reflected wave or a surface acoustic wave transmitted toward an antenna unit.
JP2005196255A 2005-07-05 2005-07-05 Rfid tag and rfid system Withdrawn JP2007018067A (en)

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US8690070B2 (en) 2009-04-14 2014-04-08 Murata Manufacturing Co., Ltd. Wireless IC device component and wireless IC device
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