JP2007114873A - Rfid tag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a human error of erroneously writing data into an RFID (Radio Frequency Identification) tag out of target. <P>SOLUTION: This RFID tag 1 openably/closably includes a movable contact 61 for connecting a pair of connection terminals 62a, 62b provided in end wire parts 22 on both the sides of an antenna 2 in parallel as a switch part 6 for short-circuiting or electrically conducting conducting wires between the antenna 2 and an IC chip 3. When the RFID tag 1 is installed to an object 10, the switch part 6 is opened to electrically conduct the conducting wires of the antenna 2 to power supply parts 23, and the IC chip 3 can operate. When the RFID tag 1 is removed from the object 10, the switch part 6 is closed to short-circuit the conducting wires of the antenna 2 to the power supply parts 23, the IC chip 3 cannot operate, and the data cannot be read/written. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an RFID tag used in fields such as sales and distribution.

  In recent years, systems using RFID tags have been constructed mainly in fields such as sales and distribution. This system can read and write data wirelessly with respect to an RFID tag attached to an object by performing communication using an electromagnetic wave or radio waves between the RFID tag and an external reader / writer. Further, the RFID tag has an advantage that it can be written in comparison with a tag printed with a barcode that has been conventionally used, and the data once written can be rewritten. However, the RFID tag has the advantage of being able to read and write a large amount of data wirelessly as described above, but also has the following problems.

  For example, in a mail-order business, there may be a case where a customer at a delivery destination shows an actual product and purchases it if he / she likes it, and he / she returns it if he / she does not like it. If there is a return in this case, the delivery operator attaches an RFID tag to the return product, writes data such as the delivery destination, date and time, reason for return, etc., takes it back to the store, and manages the return. At this time, the delivery operator possesses an unused RFID tag together with the product to be delivered, and when receiving a return, data is written using a handy reader / writer on site, but the RFID attached to a certain return product Although the intention to write data to the tag may be erroneously written to other unused tags, data matching cannot be ensured and management will be hindered. Therefore, if there is a function that cannot write data to an RFID tag before being attached to a product, the above-described human error can be prevented in advance, which is convenient.

  On the other hand, if data related to returns is written on an RFID tag and attached to a product at the same return management site, it can be understood why the product was returned by reading the tag, and the subsequent sales It can also be used for strategy. However, human error such as overwriting the already written RFID tag by mistake and erasing the original data during the writing process of other products may occur. Therefore, contrary to the above example, it is also required that the RFID tag after being attached to a product has a function that prevents data from being written.

  Note that the following patent document discloses a technique in which a label-like data carrier that can be attached to a product cannot be reused when it is peeled off from the product after being attached. The specific content of the technology is that an internal component consisting of an antenna and an IC chip is sandwiched between the first adhesive layer and the second adhesive layer, and is attached to the product via the second adhesive layer. If an attempt is made to remove the data carrier from the product, the antenna of the internal component is damaged and communication becomes impossible. However, this technology is effective for preventing the act of exchanging a genuine product with a data carrier attached to a fraudulent product, but it can only be used once, so it can be repeatedly attached and removed from the product as described above. Not suitable for.

JP 2000-48147 A

  The present invention has been made to solve the above-described problems, and the object of the present invention is to limit the functions of the RFID tag before being attached to the product or after being attached to the product, thereby reducing the purpose of the RFID tag. It is an object of the present invention to provide an RFID tag that can prevent human error that erroneously writes data.

  In order to achieve the above object, an RFID tag of the present invention is an RFID tag having an unrestricted state with no function restriction and a restricted state with a function restriction, depending on the attachment state of the RFID tag to an object. Switching means for switching the state of the RFID tag between the unrestricted state and the restricted state.

  In the present invention, the unrestricted state is a state where functions that can be executed are not restricted. For example, an RFID tag having a function for reading and writing data stored in an IC chip means a state in which both a reading function and a writing function are possible. On the other hand, the restricted state is a state in which at least some functions are restricted. That is, in the RFID tag of the present invention, the restricted state is a state in which only one of a reading function and a writing function of data stored in the memory of the IC chip is impossible. However, the restricted state includes not only a state where only one of the reading function and the writing function is impossible, but also a state where both the reading function and the writing function are impossible.

  In the present invention, when the RFID tag is attached to the object or removed from the object, it is arbitrary whether the state is set to an unlimited state or a restricted state. That is, in the RFID tag of the present invention, the switching means switches to the unrestricted state when the RFID tag is attached to the object, and switches to the restricted state when the RFID tag is removed from the object. It can be a means. On the contrary, in the RFID tag of the present invention, the switching means switches to the restricted state when the RFID tag is attached to the object, and when the RFID tag is removed from the object. It is good also as a means to switch to the said unlimited state.

  Further, the RFID tag of the present invention is an RFID tag having a restriction state of a plurality of patterns whose functions are restricted, and the state of the RFID tag is restricted according to the attachment state of the RFID tag to an object. It has a switching means for switching between states.

  In a preferred embodiment of the present invention, various modes can be considered as the switching means. As an example, a configuration for switching between a means for short-circuiting a conductor of an antenna connected to an IC chip and a means for conducting, and other examples are possible. It is possible to adopt a configuration in which switching is performed by means for changing the resonance frequency of the antenna by increasing or decreasing the capacitance of the antenna connected to the IC chip.

  Here, the following specific examples are conceivable as a configuration for switching between the means for short-circuiting the conductor of the antenna and the means for conducting the antenna. For example, the means for short-circuiting the conductor of the antenna is configured to connect in parallel between a pair of connection terminals provided on the end line portions on both sides of the antenna by contact of the movable contact, and the means for conducting the conductor of the antenna is connected to the movable contact. The connection terminals can be disconnected by being separated. Alternatively, the means for short-circuiting the antenna conductor is configured to disconnect the pair of connection terminals provided on one end of the antenna by separating the movable contact, and the means for conducting the antenna conductor is provided. The connection terminals may be connected in series by contact of the movable contact.

  On the other hand, the following specific examples are conceivable as the configuration for switching by the means for changing the resonance frequency of the antenna mentioned in the latter. For example, the electrode portion is brought into contact with the insulating layer coated on the antenna to increase the antenna capacitance, and the electrode portion is separated from the insulating layer to reduce the antenna capacitance. be able to. Alternatively, by sticking a release paper having an electrode layer to the adhesive layer applied on the antenna, the capacitance of the antenna is increased, and the release paper having the electrode layer is peeled off. It is good also as a structure which reduces the electrostatic capacitance of an antenna.

  In the present invention, the data transmission method between the RFID tag and the reader / writer may be any one of an electromagnetic coupling method, an electromagnetic induction method, and a microwave method. In addition, various shapes of antennas such as a loop-shaped coil antenna and a linear dipole antenna can be employed.

  As is clear from the above configuration, according to the RFID tag of the present invention, the RFID tag state between the unrestricted state without function restriction and the restricted state with function restriction according to the attachment state of the RFID tag to the object. Since a configuration having switching means for switching between them is employed, it is possible to prevent a human error that erroneously writes data to an unintended RFID tag. Therefore, for example, in mail order sales return management, data related to other returned products may be written to an unused tag other than the RFID tag attached to the returned product, or conversely, a written RFID tag already attached to the returned product. Can be prevented from being overwritten, data matching between the product and the RFID tag is reliably ensured, and a highly reliable system can be constructed.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

(First embodiment)
1 is an external view showing the configuration of the RFID tag according to the first embodiment, FIG. 2 is a cross-sectional view of the RFID tag, FIG. 3 is a circuit block diagram of the RFID tag, and FIG. 4 is a diagram in which the RFID tag is attached to an object. FIG. 5 is an explanatory view showing a state in which the RFID tag is removed from the object.

  The RFID tag 1 according to the present embodiment employs an electromagnetic induction method as a data transmission method with a reader / writer. When the RFID tag 1 is attached to the object 10, the RFID tag 1 is in an unrestricted readable / writable state without limiting its function. When it is removed from 10, the function is limited so that it becomes a restricted state in which reading and writing are impossible.

  As shown in FIGS. 1 and 2, the RFID tag 1 is constituted by an inlet 4 in which an antenna 2 and an IC chip 3 are mounted on an insulating base material, and the outer periphery of the inlet 4 is made of a resin film. It is covered with a protective layer 5.

  The antenna 2 is a coil antenna suitable for an electromagnetic induction system, and includes a coil part 21 wound in a loop shape, two end line parts 22 and 22 extending linearly to the outside across the coil part 21, It is composed of a pair of power feeding parts 23, 23 provided at the tip of the end line part 22. The antenna 2 is formed by etching a conductor made of copper foil on a base material, and the power feeding portions 23 and 23 are connected to a pair of power supply terminals of the IC chip 3 by soldering. When the antenna 2 receives electromagnetic waves radiated from an external reader / writer, the antenna 2 generates electromotive force due to electromagnetic induction at both ends of the coil portion 21, and supplies the current flowing through the coil portion 21 by the electromotive force from the power feeding portion 23. 3 is operated.

  The IC chip 3 is an electronic component that performs communication processing of various data with the reader / writer, and includes a CPU, a modem circuit, and a nonvolatile memory such as an EEPROM. The IC chip 3 operates without a battery by the electromotive force generated in the antenna 2, and the current supplied from the power supply unit 23 of the antenna 2 is DC smoothed and supplied to the CPU, thereby starting the CPU. The activated CPU detects the modulated wave received from the reader / writer via the antenna 2 by the modulation / demodulation circuit, demodulates it into data, and performs predetermined processing according to the command of the demodulated data. That is, when the command is a write process, the CPU stores the received data in a rewritable memory in a rewritable manner, and when the command is a read process, the CPU reads the data stored in the nonvolatile memory and reads out the modulation / demodulation circuit. The modulated wave is transmitted from the antenna 2 to the reader / writer.

  The RFID tag 1 of the present embodiment is characterized in that it includes switching means for switching between an unrestricted state in which reading and writing are possible and a restricted state in which reading and writing are impossible, depending on the state of attachment to the object 10. Various specific configurations of the switching means are conceivable, but in this embodiment, by providing a switch unit 6 for short-circuiting or conducting a conductor from the antenna 2 to the IC chip 3, the power supply unit 23 of the antenna 2 to the IC chip 3 is provided. The structure which controls the electric current supplied to is adopted.

  A specific structure of the switch unit 6 is a clip structure as shown in the figure, and an ON / OFF function of a power source can be realized simultaneously with an attachment function to the object 10 by using an opening / closing operation of the clip. That is, the switch unit 6 is formed of a leaf spring clip obtained by bending a metal plate in a curved shape, and the base of the clip is bonded and fixed to the protective layer 5 on the back surface of the inlet 4 and integrated with the RFID tag 1. Therefore, the RFID tag 1 integrated with the clip can be detachably attached to the object 10 by opening the clip and sandwiching the object 10 in the gap.

  A movable contact 61 is provided at the tip of the clip, and the surface of the inlet 4 facing the clip is not covered with the protective layer 5 in a region corresponding to the movable contact 61, and the end lines on both sides of the antenna 2 are covered. A pair of connection terminals 62a and 62b provided in the portions 22 and 22 are exposed to the outside. Further, the tip of the clip is always urged in the closing direction by the spring force of the bending portion, and thereby the movable contact 61 is simultaneously in contact with both connection terminals 62a and 62b, but resists the spring force of the bending portion. The clip is opened to be separated from both connection terminals 62a and 62b.

  The electrical circuit configuration of the RFID tag 1 having such a structure will be described. As shown in FIG. 3, the switch unit 6 is disposed between the antenna 2 and the IC chip 3. A connection terminal 62a provided on the end line portion 22 of the antenna 2, a connection terminal 62b provided on the end line portion 22 on the other side of the antenna 2, and a movable contact 61 that connects the connection terminals 62a and 62b in parallel. Is.

  That is, when the clip is closed by removing the RFID tag 1 from the object, the movable contact 61 at the tip of the clip blocks the end line portion 22 of the antenna 2 as shown in FIG. Since it contacts 62b, the movable contact 61 closes and acts as a kind of jumper wire, and the connection terminals 62a and 62b are connected in parallel. Therefore, the conducting wire between the coil part 21 and the power feeding part 23 in the antenna 2 is short-circuited, and the current supply from the power feeding part 23 to the IC chip 3 is interrupted. This is a power-off state, and since the IC chip 3 does not operate, communication between the reader / writer and the RFID tag 1 becomes impossible, and data cannot be read from or written to the memory.

  On the other hand, when the clip is opened by attaching the RFID tag 1 with the object sandwiched therebetween, the movable contact 61 at the tip of the clip is separated from both the connection terminals 62a and 62b of the antenna 2 as shown in FIG. The movable contact 61 is opened and the connection between the connection terminals 62a and 62b is cut off. Therefore, the conducting wire between the coil portion 21 and the power feeding portion 23 in the antenna 2 is conducted, and the current flowing through the antenna 2 is supplied from the power feeding portion 23 to the IC chip 3. This is a power-on state, and the IC chip 3 operates, so that communication between the reader / writer and the RFID tag 1 becomes possible, and data can be read from and written to the memory.

  As described above, the RFID tag 1 according to the present embodiment is configured such that when it is attached to the object 10, it can be read and written without any function restriction, and when it is detached from the object 10, its function is restricted so that reading and writing are impossible. Therefore, when the RFID tag 1 attached to the product is repeatedly used as in the above-described return management, data related to other returned products is written to an unused tag other than the RFID tag 1 attached to the returned product. It is suitable as an application for preventing the above.

(Second Embodiment)
FIG. 6 is a circuit block diagram showing the configuration of the RFID tag according to the second embodiment. In addition, in this embodiment, about the structure which is common in 1st Embodiment, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

  The RFID tag 1 of the present embodiment adopts an electromagnetic induction method. However, contrary to the first embodiment described above, when the RFID tag 1 is attached to the object 10, the function is limited so that reading / writing is not possible. The function restriction is released when the object 10 is removed from the object 10, and an unrestricted readable / writable state is established. In this embodiment, the configuration in which the switch unit 6 for short-circuiting or conducting the conductor of the antenna 2 is provided in common with the first embodiment, but the switch unit 6 is disposed between the antenna 2 and the IC chip 3. The antenna 2 is different in that it has a pair of connection terminals 63a and 63b provided on the end line portion 22 on one side of the antenna 2 so as to be separated from each other and a movable contact 61 that connects the connection terminals 63a and 63b in series. In addition, the coil part 21 and the electric power feeding part 23 are connected in the end line part 22 on the other side of the antenna 2.

  That is, when the clip is closed, the movable contact 61 at the tip of the clip comes into contact with both connection terminals 63a and 63b of the antenna 2, so that the movable contact 61 is closed and the connection terminals 63a and 63b are connected in series. Therefore, the conducting wire between the coil portion 21 and the power feeding portion 23 in the antenna 2 is conducted, and the current flowing through the antenna 2 is supplied from the power feeding portion 23 to the IC chip 3. This is a power-on state, and the IC chip 3 operates, so that communication is possible between the reader / writer and the RFID tag 1, and data can be read from and written to the memory.

  On the other hand, when the clip is opened, the movable contact 61 at the tip of the clip is separated from both connection terminals 63a and 63b of the antenna 2, so that the movable contact 61 is opened and the connection between the connection terminals 63a and 63b is cut off. Therefore, the conducting wire between the coil part 21 and the power feeding part 23 in the antenna 2 is short-circuited, and the current supply from the power feeding part 23 of the antenna 2 to the IC chip 3 is interrupted. This is a power-off state, and since the IC chip 3 does not operate, communication between the reader / writer and the RFID tag 1 becomes impossible, and data cannot be read from or written to the memory.

  As described above, the RFID tag 1 of the present embodiment has a function limited when it is attached to the object 10 and cannot be read / written, and when it is detached from the object 10, the function restriction is released and the read / write can be performed. Since it is configured, when the RFID tag 1 attached to the product is repeatedly used as in the above-described return management, the data of the written RFID tag 1 already attached to the returned product is prevented from being overwritten. It is suitable as. Note that the function of the present embodiment is not used in combination with the function of the first embodiment, and the function of either one of the embodiments is selected and used according to the purpose of use.

(Third embodiment)
FIG. 7 is a cross-sectional view and a circuit block diagram showing the configuration of the RFID tag according to the third embodiment. In addition, in this embodiment, the same code | symbol is attached | subjected about the structure which is common in embodiment mentioned above, and the detailed description is abbreviate | omitted.

  The RFID tag 1 according to the present embodiment resonates by increasing / decreasing the capacitance (capacitance) of the antenna 2 instead of the switch unit 6 that short-circuits or conducts the conductor of the antenna 2 as in the first and second embodiments described above. It is characterized in that a switch unit 7 for changing the frequency is provided.

  As shown in FIG. 7, the RFID tag 1 includes an inlet 4 on which an antenna 2 and an IC chip 3 are mounted. A conductive first electrode portion 71 a is provided at the tip of a switch portion 7 made of a metal clip, and a rear end thereof. The second electrode portion 71b is provided on the outer periphery of the inlet 4, and the insulating layer 72, which is a dielectric made of a resin film, is provided over the entire outer periphery of the inlet 4. As shown in FIG. 2B, the first electrode portion 71a is disposed so as to cut vertically between the antenna 2 and the IC chip 3, and the antenna 2 on the inlet 4 is not exposed to the outside. On the other hand, the second electrode portion 71 b is embedded from the side of the tag and is always connected to the end line portion 22 a on one side of the antenna 2. Note that the natural resonance frequency of the antenna 2 is set to an optimum value so that communication can be performed with the reader / writer in a state where the clip is opened and the first electrode portion 71a and the insulating layer 72 are not in contact with each other. ing.

  According to the RFID tag 1 having such a structure, when the clip is closed, the first electrode portion 71a and the insulating layer 72 are in contact with each other, and the insulating layer 72 sandwiched between the first electrode portion 71a and the second electrode portion 71b is the electrode. Functions as a dielectric between. As a result, a closed circuit is formed by the antenna 2 and the switch unit 7, and a parasitic capacitor is formed on each of the end line portion 22 a on one side and the end line portion 22 b on the other side of the antenna 2. . That is, the antenna 2 becomes an LC resonance circuit including the coil unit 21 and the capacitor, and the capacitance is increased by being stored in the capacitor. As a result, the resonance frequency of the antenna 2 is shifted and communication between the reader / writer and the RFID tag 1 is performed. Becomes impossible.

  Therefore, when the clip is closed, that is, when the RFID tag 1 is removed from the object 10, the function can be limited so that data cannot be read from and written to the memory of the IC chip 3 as in the first embodiment. Contrary to this structure, if the clip is closed so that the optimum resonance frequency is obtained when the capacitor is formed, the RFID tag 1 is attached to the object 10 when the clip is opened. In this case, it is possible to limit the function so that the resonance frequency shifts and communication becomes impossible and data cannot be read from and written to the memory of the IC chip 3.

(Fourth embodiment)
FIG. 8 is a cross-sectional view showing the configuration of the RFID tag of the fourth embodiment. In addition, in this embodiment, the same code | symbol is attached | subjected about the structure which is common in embodiment mentioned above, and the detailed description is abbreviate | omitted.

  The RFID tag 1 of the present embodiment is the same as that of the third embodiment in that a configuration is provided in which a switch unit 7 that changes the resonance frequency by increasing or decreasing the capacitance of the antenna 2 is employed. The specific structure is different as follows.

  As shown in FIG. 8, this RFID tag 1 has an inlet 4 in which a plurality of inlets 4 each having an antenna 2 and an IC chip 3 mounted thereon are stuck on a sheet-like release paper 73 and wound in a roll shape. Roll paper. In this inlet roll paper, the inlet 4 and the release paper 73 are detachably attached via an adhesive layer 75 applied to the back surface of the inlet 4 as shown in FIG. The switch unit 7 is configured by providing an electrode layer 74 to which a conductive paint is applied in a region corresponding to 2. Further, the natural resonance frequency of the antenna 2 is optimal so that communication can be performed with the reader / writer in a state where the inlet 4 is peeled off from the release paper 73 and the adhesive layer 75 and the electrode layer 74 are not in contact with each other. Is set to a value.

  According to the RFID tag 1 made of such an inlet roll paper, a clip for attaching to the object 10 becomes unnecessary, and the inlet 4 peeled off from the release paper 73 can be directly attached to the object 10 by the adhesive layer 75. . Further, when the inlet 4 is adhered to the release paper 73, the adhesive layer 75 sandwiched between the electrode layer 74 and the antenna 2 functions as a dielectric between the electrodes, and a parasitic capacitance capacitor is formed. . That is, similarly to the third embodiment, the antenna 2 becomes an LC resonance circuit including the coil unit 21 and the capacitor, and is stored in the capacitor to increase the capacitance. As a result, the resonance frequency of the antenna 2 is shifted and the reader / writer is not connected. Communication becomes impossible.

  Therefore, the function can be restricted so that data cannot be read from and written to the memory of the IC chip 3 when the inlet 4 is attached to the release paper 73, and the restriction is released when the inlet 4 is peeled from the release paper 73. The data can be read / written to / from the memory only after the data is pasted to 10. Contrary to this structure, when the inlet 4 is attached to the release paper 73, if it is set so as to have an optimum resonance frequency, the inlet 4 is peeled off and attached to the object 10. It is also possible to limit the function so that the resonance frequency is shifted and communication becomes impossible and data cannot be read from and written to the IC chip 3.

(Fifth embodiment)
FIG. 9 is a circuit block diagram showing the configuration of the RFID tag of the fifth embodiment. In addition, in this embodiment, the same code | symbol is attached | subjected about the structure which is common in embodiment mentioned above, and the detailed description is abbreviate | omitted.

  As shown in FIG. 9, the RFID tag 1 according to the present embodiment does not invalidate all the communication functions in the inlet 4 in which the antenna 2 and the IC chip 3 are mounted according to the attachment state to the object 10. The switch unit 8 for switching the operation mode of the IC chip 3 is provided so that only one of the reading function and the writing function is disabled. The switch unit 8 includes a ground terminal 81 connected to the power supply terminal of the IC chip 3, a read lead terminal 82 and a write write terminal 83 connected in parallel to the ground terminal 81. Further, the lead terminal 82 is provided with a first movable contact 84 that switches between conduction and non-conduction with the ground terminal 81, and the write terminal 83 similarly switches between conduction and non-conduction with the ground terminal 81. Two movable contacts 85 are provided.

  In such a structure, for example, when the RFID tag 1 is attached to an object, if the first movable contact 84 is closed and the second movable contact 85 is opened, the ground terminal 81 and the lead terminal are set. 82 is conducted. As a result, the reference potential applied to the ground terminal 81 from the power feeding unit 23 of the antenna 2 is supplied only to the lead terminal 82, and only the function of reading data stored in the memory of the IC chip 3 is enabled. On the other hand, when the RFID tag 1 is removed from the object, the first movable contact 84 is opened and the second movable contact 85 is closed, whereby the ground terminal 81 and the light terminal 83 are conducted. Therefore, since the reference potential applied to the ground terminal 81 from the power feeding unit 23 of the antenna 2 is supplied only to the write terminal 83, only the function of writing data stored in the memory of the IC chip 3 is enabled. be able to. Note that switching between the reading function and the writing function may be the reverse of the above example.

  As described above, according to the RFID tag 1 of the present embodiment, only one of the reading function and the writing function can be invalidated as a function restriction pattern corresponding to the attachment state to the object 10. The convenience of the RFID tag 1 is significantly improved. Note that the above example is an example of switching among a plurality of patterns in a restricted state depending on the state of attachment to the object 10. However, the present invention is not limited to this. It is also possible to switch between one of the limited states of the pattern.

1 is an external view illustrating a configuration of an RFID tag according to a first embodiment. FIG. 2 is a cross-sectional view of the RFID tag in FIG. The circuit block diagram which shows the structure of the RFID tag of FIG. Explanatory drawing which shows the state which attached the RFID tag of FIG. 1 to the target object. Explanatory drawing which shows the state which removed the RFID tag of FIG. 1 from the target object. The circuit block diagram which shows the structure of the RFID tag of 2nd Embodiment. Sectional drawing and the circuit block diagram which show the structure of the RFID tag of 3rd Embodiment. Sectional drawing which shows the structure of the RFID tag of 4th Embodiment. The circuit block diagram which shows the structure of the RFID tag of 5th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 RFID tag 2 Antenna 21 Coil part 22 End line part 23 Electric power feeding part 3 IC chip 4 Inlet 5 Protection layer 6 Switch part 61 Movable contact 62a, 62b Connection terminal 63a, 63b Connection terminal 7 Switch part 71a 1st electrode part 71b 2nd Electrode part 72 Insulating layer 73 Release paper 74 Electrode layer 75 Adhesive layer 8 Switch part 81 Ground terminal 82 Lead terminal 83 Write terminal 84 First movable contact 85 Second movable contact 10 Target

Claims (11)

  An RFID tag having an unrestricted state with no function restriction and a restricted state with a function restriction, wherein the state of the RFID tag is set to the unrestricted state and the restricted state according to the attachment state of the RFID tag to an object. An RFID tag comprising switching means for switching between the two.   2. The RFID tag according to claim 1, wherein the restricted state is a state where only one of a reading function and a writing function of data stored in a memory of an IC chip is impossible.   The switching means is means for switching to the unrestricted state when the RFID tag is attached to an object and switching to the restricted state when the RFID tag is removed from the object. Item 3. The RFID tag according to Item 1 or 2.   The switching means is means for switching to the restricted state when the RFID tag is attached to an object and switching to the unrestricted state when the RFID tag is removed from the object. Item 3. The RFID tag according to Item 1 or 2.   An RFID tag having a restriction state of a plurality of patterns whose functions are restricted, and having switching means for switching the state of the RFID tag in the restriction state of the plurality of patterns according to the attachment state of the RFID tag to an object An RFID tag characterized by the above.   The RFID tag according to any one of claims 1 to 5, wherein the switching means is switched by means for short-circuiting and conducting means for a conductor of an antenna connected to the IC chip.   6. The RFID tag according to claim 1, wherein the switching means is switched by means for changing the resonance frequency of the antenna by increasing or decreasing the capacitance of the antenna connected to the IC chip. .   The means for short-circuiting the conductor of the antenna is for connecting in parallel between a pair of connection terminals provided on the end line portions on both sides of the antenna by the contact of the movable contact, and the means for conducting the conductor of the antenna is as described above. The RFID tag according to claim 6, wherein the connection terminals are disconnected by moving the movable contact.   The means for short-circuiting the conductor wire of the antenna is to disconnect the pair of connection terminals provided at one end line portion of the antenna by separating the movable contact, and the means for conducting the conductor wire of the antenna is The RFID tag according to claim 6, wherein the connection terminals are connected in series by contact of a movable contact.   The means for changing the resonance frequency of the antenna is to increase the capacitance of the antenna by the electrode portion coming into contact with the insulating layer applied on the antenna, and by separating the electrode portion from the insulating layer. 8. The RFID tag according to claim 7, wherein the RFID tag reduces the capacitance of the antenna.   The means for changing the resonance frequency of the antenna increases the capacitance of the antenna by sticking a release paper having an electrode layer to an adhesive layer applied on the antenna, and has the electrode layer. 8. The RFID tag according to claim 7, wherein the electrostatic capacitance of the antenna is reduced by peeling the release paper.

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