JP2006119752A - Functional tag with function changing means by separation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve security by preventing the tampering or the like of data in an IC tag. <P>SOLUTION: The IC tag is constituted of three parts, i.e. separable parts A1 and A2 and a non-separation part B (a tag body). The parts A1, A2 and A3 are provided with an IC1, an IC2 and an IC3 and antennas 1, 2 and 3 being interfaces with external apparatuses, respectively. The IC1 and the IC2 are connected by a signal line L1 for signal transmission, whereas the IC2 and the IC3 are connected by a signal line L2 for signal transmission. The signal line L1 is wired so as to be simultaneously disconnected when the part A1 is separated from the tag body, and the signal line L2 also is wired with a layout so as to be disconnected when the part A2 is separated from the tag body. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an IC tag, and more particularly, to an IC tag provided with a function changing means by separating part of the tag.

  Recently, for the purpose of merchandise distribution / inventory management, checkout processing in stores and theft prevention, IC tags with antennas and IC chips on insulators such as paper and plastic, and readers that communicate with IC tags For example, the system shown in FIG.

  As a typical configuration example of an IC tag used in such a system, a reader / writer device 250 and an IC tag 200 are generally provided as shown in FIG. In the system shown in FIG. 8, an IC 20 (210) that uses radio waves for communication between the reader / writer device 250 and the IC tag 200 and includes an RF unit, a modulation / demodulation unit, and a data storage unit (not shown). A non-contact type IC tag (RFIC tag) configured with an antenna 201 has been proposed (see, for example, Patent Document 1).

  FIG. 9 is a perspective view showing a configuration example of a general IC tag. As shown in FIG. 9, the IC tag is an RFIC tag having a structure in which a coil antenna 201 and an IC chip 210 are laminated on an insulating substrate 90 such as paper or plastic. Since it has such a simple structure, various applications as described above are possible.

JP-A-9-62934

  Due to the nature of the tag to be attached to a product or the like, an IC tag typified by the RFIC tag described in the background art is required to be small and light. Therefore, it is preferable that the circuit configuration of the IC mounted on the IC tag has a simple configuration, and it has been difficult to mount hardware or software for preventing data tampering that requires an additional configuration on the IC tag. . Therefore, the conventional IC tag has a problem that it is easy to tamper with data because of its simple structure.

  An object of the present invention is to prevent data tampering and improve security in an IC tag.

  The present invention has a configuration in which the IC tag is provided with a detachable portion, and the detachable portion is separated from the tag main body, thereby changing restrictions on data input to the IC tag and data output from the IC tag. Thereby, falsification of data can be prevented. Changes to IC tag functions, such as changes to signal processing performed by IC tags or automatic updates and changes of stored data, can be made naturally without the use of a reader / writer device, such as by the hand of a person in the product distribution process. It can be so. By linking the change in the appearance of the IC tag and the change in the function of the IC tag, it is possible to visually grasp the current state of the function of the IC tag.

  According to the IC tag of the present invention, by separating the separable part, there is an advantage that the function change of the IC tag without using a machine can be easily realized unlike the conventional single function type IC tag. Further, by separating the separable part, the appearance of the IC tag can be changed, and the state of the IC tag can be grasped visually without using a reader / writer device.

  Furthermore, since the function change of the tag and the input / output of data can be restricted according to the separation state of the tag, security against data tampering can be improved.

  In addition, by sharing the tag functions among a plurality of ICs, it is possible to improve security by causing an appropriate function change to occur only when the separable parts are separated in a prescribed order. Furthermore, the effect that the separable part separated from the main body can be used as an independent IC tag can be obtained.

  Hereinafter, an IC tag and related technology according to embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration example of an IC tag whose function is changed by separating a separable part when the number n of separable parts from the tag body is n = 2. The IC tag shown in FIG. 1 is composed of three parts: A1 and A2 parts that can be separated and a non-separable part B (tag body). Portions A1, A2, and B are antenna 1, antenna 2, and antenna as interfaces of IC1, IC2, and IC3, respectively, and the tag and the outside (reader / writer device that exchanges data between tags) 3 is provided.

  IC1 (10) and IC2 (20) are signal transmission lines L1 for signal transmission between IC1 (10) and IC2 (20), and IC2 (20) and IC3 (30) are IC2 (20) and IC2 (20). The signal lines L2 for signal transmission between the IC3 (30) are connected to each other. When A1 is disconnected from the tag body, the signal line L1 is also wired so that it is disconnected. Similarly, the signal line L2 is also wired with a layout that is disconnected when A2 is disconnected from the tag body. Yes.

  The lines SL12 and SL21 connected to the common GND from IC1, IC2 and IC3 are when the A1 portion is disconnected from the tag body, and the lines SL23 and SL32 are when the A2 portion is disconnected from the tag body. These are laid out and wired so as to cross the boundary line for separating A1 and A2 or the boundary line for separating A2 and B so as to be cut. Lines SL12, SL21, SL23, and SL32 are disconnection determination lines that are provided to detect changes in the impedance of the line caused by the line disconnection and to be used for determining the disconnection of the A1 part or the A2 part.

  2 is a perspective view showing a three-dimensional structure of the IC tag shown in FIG. As shown in FIG. 2, the IC tag according to the present embodiment is provided on an insulating substrate 90 such as paper or plastic. A common GND line 91 is provided along one side of the insulating substrate 90. The common GND line 91 grounds the ICs 1, 2, and 3, and also grounds the lines SL12, SL21, SL23, and SL32.

  FIG. 3 is a block diagram illustrating a configuration example of the IC1 (10). As shown in FIG. 3, the IC 1 (10) receives and transmits signals to and from the power supply circuit 11 that converts a part of the received signal from the antenna 1 into power and the antenna 1 that is an external interface of the tag. Transmission / reception circuit 12, modulation circuit 13 that modulates encoded data, demodulation circuit 14 that demodulates a reception signal, encoding / decoding circuit 15 that encodes transmission data and decodes reception data, and encoding / decoding circuit 15 or operations of the data processing circuit 1 (16) and the storage device 1 (18) for processing data sent via the signal line L1, and the operations of the data processing circuit 1 (16) and the storage device 1 (18). The control circuit 1 (17) that controls the A1 according to the state of the tag, and the part A1 itself determines whether or not the part A1 is separated from the part A2. Ri release has a decision circuit 2 (19), the. The power supply circuit 11 is connected to the common power supply line, the data processing circuit 1 (16) is connected to the line L1 connecting the IC1 (10) and the IC2 (20), and the A1 disconnection determination circuit 2 (19) is connected to the line SL12. It is connected.

  FIG. 4 is a diagram illustrating a configuration example of the IC 2 (20). As shown in FIG. 4, the IC 2 (20) includes a power supply circuit 11 that converts a part of the received signal into electric power, and a transmission / reception circuit 12 that receives and transmits the signal to the antenna 2 that is an external interface of the tag. A modulation circuit 13 that modulates the encoded data, a demodulation circuit 14 that demodulates the received signal, an encode / decode circuit 15 that encodes and decodes the data, and a data processing circuit 2 (21) that processes the data A control circuit 2 (22) for controlling the operations of the storage device 2 (23), the data processing circuit 2 (21) and the storage device 2 (23) according to the state of the tag, and a portion A1 is a portion A2. “A1 disconnection determination circuit 1” (24) for determining whether or not the part A2 is disconnected from the part B, and the part A2 itself determines whether or not the part A2 is disconnected from the part B “ Has a 2 disconnect determination circuit 2 "(25), the.

  FIG. 5 is a functional block diagram showing a configuration example of the IC3 (30). As shown in FIG. 5, IC3 (30) receives and transmits a signal to power supply circuit 3 (11) that converts a part of the received signal into power and antenna 3 that is an external interface of the tag. A transmission / reception circuit 12, a modulation circuit 13 for modulating encoded data, a demodulation circuit 14 for demodulating a received signal, an encoding / decoding circuit 15 for encoding and decoding data, and a data processing circuit 3 for processing data (31), the storage device 3 (33), the control circuit 3 (32) for controlling the operation of the data processing circuit 3 (31) and the storage device 3 (33) according to the state of the tag, and the part A2. And “A2 disconnection determination circuit 1” 34 for determining whether or not is disconnected from the part B.

  FIG. 6A is a functional block diagram illustrating a configuration example of the A1 disconnection determination circuit 1 (24) of the IC2 (40). As shown in FIG. 6a, the A1 disconnection determination circuit 1 (24) includes a signal line L1 disconnection determination circuit 1 (40) and an impedance change detection circuit 1 (50) that detects a change in impedance of the line SL21. Has been. Tables 1a to 1d are separation determination tables.

  The signal line L1 disconnection determination circuit 1 (40) collates the identification data sent from the IC1 (10) via the signal line L1 with the collation data 42, and the signal line as shown in Table 1a. If the identification data sent from the IC 1 via L1 matches the verification data 42, “0” is output, and if the identification data and the verification data 42 do not match, “1” is output. Is output.

Similarly, an “impedance change detection circuit 1” 50 that detects a change in impedance of the line SL21 detects whether or not the line SL21 is grounded to the common GND. As shown in Table 1a, the line SL21 is detected. Is output to “0” when grounded to the common GND, and “1” is output when the line SL21 is cut open.
The A1 disconnection determination circuit 1 (24) calculates the logical product of the output of the “signal line L1 disconnection determination circuit 1” and the output of the “impedance change detection circuit 1” as shown in Table 1a. When this logical product is “1”, it is determined that A1 is separated from the tag.

  The determination of disconnection of the signal line L1 may employ a method of collating data stored in advance in the IC1 (10) and IC2 (20) as identification data and collation data, respectively. Any verification data is transmitted from the IC 2 (20) to the IC 1 (10) via the signal line L1, and the arbitrary verification data received by the IC 1 (10) is returned as identification data. A method of collating in the L1 separation determination circuit 1 ”40 may be employed.

  In the description of the operation of the L1 disconnection determination circuit 1 (40), an AND circuit 54 calculates the logical product of the output of the “signal line L1 disconnection determination circuit 1” 40 and the output of the “impedance change detection circuit 1” 50. When the logical product is “1”, it is determined that A1 is separated from the tag. However, the determination method is not limited to this. For example, when the logical sum of the output of the “signal line L1 disconnection determination circuit 1” 40 and the output of the “impedance change detection circuit 1” 50 is “1”, that is, the signal line L1 or the line SL21. When one of them is cut, a method of determining that the portion A1 is cut from the tag main body may be adopted. In this case, an OR circuit is used instead of the AND circuit 54.

  The operation of the impedance change detection device will be described below using the impedance change detection device 50 of the line SL21 in FIG. 6a as an example. In the AND circuit 53, two inputs are shared. The line SL21 is not disconnected before A1 is disconnected by the disconnection line 1, and the two inputs of the AND circuit 53 are at the GND potential. Therefore, the two inputs of the AND circuit 53 are “Low”, and the output of the AND circuit 53 is “0”. On the other hand, when A1 is cut off by the cut-off line 1, the line SL21 is also cut off, so that the potential of the two inputs of the AND circuit 53 is “Hi” of R2 × Vcc / (R1 + R2), and the output of the AND circuit 53 is “1”. It becomes. In this way, the impedance change detection device 50 can detect a change in the impedance of the SL 21 due to the disconnection of the A1 by the separation line 1.

  The configurations of the remaining three separation determination circuits other than the A1 separation determination circuit 1 (24) are shown in FIGS. 6b, 6c, and 6d, and the separation determination tables of each separation determination circuit are shown in Tables 1b, 1c, and Shown in 1d. The configuration and operation principle of the three disconnection determination circuits are basically the same as those of the A1 disconnection determination circuit 1 described above, and a description thereof is omitted here.

  7a, 7b, and 7c are functional block diagrams illustrating configuration examples of the storage device 1 (18), the storage device 2 (23), and the storage device 3 (33).

  As shown in FIG. 7a, the storage device 1 (18) has a storage area 1 (64) from the data processing circuit 1 (16), a write control circuit 61, a read control circuit 62, and a read dedicated circuit 63. Yes. The write control circuit 61 stores the write data from the data processing circuit 1 (16) based on the operation of the first function of the IC tag based on the control data of the write request from the control device 1 in the storage area 1 (64). To record. The read-only circuit 62 prevents data from being written to the storage area 1 (64) based on the control data of the read-only request from the control circuit 1 (17). As a result, data cannot be written, and the storage area 1 (64) is read-only. The read control circuit 62 sends the data recorded in the recording area 1 (64) to the data processing device 3 (31) based on the control data of the read request from the control device 1 (17).

  FIG. 7 b is a diagram illustrating a configuration of the storage device 2 of the IC 2. As shown in FIG. 7b, the storage device 2 (23) is configured in the same manner as the storage device 1 (18), and a recording write process based on the operation of the second function in the storage area 2 (65). Also, read processing and read-only processing are performed.

  FIG. 7 c is a diagram illustrating a configuration example of the storage device 3 (33) of the IC 3. As shown in FIG. 7c, the storage device 3 (33) performs the same processing as the storage device 1 (18) with respect to the writing process, the reading process, and the read-only process. However, the storage device 3 (33) performs the operations of the first function and the second function respectively controlled by the IC1 and IC2, in addition to the storage area 3 (66) for recording data based on the operation of the third function. It consists of a storage area 1 (64) and a storage area 2 (65) for recording.

  The IC tag shown in FIG. 1 is processed along the distribution process as follows. 1) With part A1, part A2, and part B all together, data such as product identification code, serial number, date of manufacture, and shipping date is input to the tag (stored in the storage device), and the product Attach to 2) The part A1 is separated from the tag at the time of factory shipment and shipped to a store. Here, the separated part A1 is left as a shipment source copy. 3) At the store, enter data such as the date and time of sale and the store name. After that, the part A2 is cut off, and the product with the tag having only the part B is given to the purchaser. At this time, the separated part A2 is left as a store copy. 4) The tag of only the part B delivered to the purchaser together with the product becomes a purchaser's copy. Table 2 shows an example of the correspondence relationship between the tag state change and the accompanying tag function change when the tag according to the present embodiment is used for such merchandise distribution management.

  In Table 2, IC1 (10) controls all the control for realizing the first function, and IC2 (20) controls all the control for realizing the second function.

  That is, at the time of shipment from the factory, the IC 1 (10) specifies the communication control outside the tag, the communication with the IC 2 (20) and the IC 3 (30), and the address of the storage area 1 from the storage devices 1 to 3. It has a function including sending a command to write data 1 to the storage area 1 from the devices 1 to 3, writing and reading data 1 to the storage area 1 of the storage device 1, and thereby a product identification code, The first function of inputting / outputting data (data 1) such as a manufacturing number, a manufacturing date, and a shipping date and time is exhibited. The IC2 (20) includes functions including communication with the IC1 and IC3, sending of a write prohibition instruction to the storage device 3 other than the storage region 1 to the storage device 3 of the IC3 (30), and writing of data 1 to the storage region 1 of the storage device 2. have. The IC 3 (30) has functions including communication with the IC 1 (10) and the IC 2 (20) and writing of data 1 to the storage area 1 of the storage device 3.

  In the store, the part A1 is separated, and the IC 2 (20) controls communication with the outside of the tag, communicates with the IC 3 (30), specifies the address of the storage area 2 of the storage devices 2 and 3, and the storage device 2 The functions include writing and reading data 2 to and from the storage area 2 and read-only storage area 1 of the storage device 2 (read only). The second function including input / output of data such as store name (data 2) is exhibited.

  The IC 3 (30) communicates with the IC 2 (20), makes the storage area 1 of the storage device 3 read-only, and writes the data 2 to the storage area 2 of the storage device 3.

  In the purchaser (after purchase), the parts A1 and A2 are separated, and the IC (30) is separated from A2, communication control with the outside of the tag, read-only storage of the storage areas 1 and 2 of the storage device 3 (read) Only), has the function of writing and reading data 3 to and from the storage area 3 of the storage device 3, and outputs data 1 and data 2 and any data (data 3) such as a memo by the purchaser. The third function including input and output is exhibited.

  Read-only is performed after a certain area is separated in each IC tag, part of the functions that the separated tag was responsible for (such as writing information to a storage area dedicated to that tag) This is because it is preferable to prevent this.

  On the other hand, as shown in Table 3, a part of the control function for realizing the first function is IC1 (10) and IC2 (20), and a part of the control function for realizing the second function is IC2 ( 20) and IC3 (30) may be assigned to each other. Further, the IC 2 may inhibit the writing of data to the storage area 3 of the storage device 3 as the third function.

  That is, at the time of shipment from the factory, the IC 1 (10) controls communication with the outside of the tag, communicates with the IC 2 and IC 3, sends a command to write data 1 from the storage device 1 to the storage area 1, and stores the storage device 1. The data 2 is written to and read from the storage area 1, the IC 2 (20) communicates with the IC 1 and IC 3, specifies the addresses of the storage areas 1 to 3 of the storage devices 1, and the storage area to the storage device 3 of the IC 3 A write prohibit command is sent to other than 1, and data 1 is written to the storage area 1 of the storage device 2. As is clear from comparison with the case of Table 2, a part of the function (first function) of the IC1 (10) is assigned to the IC2 (20).

  When the function for realizing one function as shown in Table 3 is distributed to a plurality of ICs, if the tag including ICs is disregarded in the order of separation and the tags do not operate normally, they are not usable, This has the effect of preventing unauthorized use.

  When the IC tag of FIG. 1 is applied to the distribution management shown in Table 4, the correspondence between the tag status change of the present invention and the tag function change accompanying the tag change and the storage areas of the storage devices 1 to 3 The relationship between the stored information and the state of each storage area is shown. As shown in Table 4, for example, regarding the data stored in the storage area 1, in the factory (before shipment), data related to data such as a product identification code, a serial number, a manufacturing date, a shipping date and time can be written and read. On the other hand, at a store (from the time of factory shipment to before sales), it is only possible to read data regarding data such as a product identification code, a serial number, a manufacturing date, a shipping date and time. As described above, writing to the information stored in each storage area of the storage devices 1 to 3 is restricted in accordance with the change in the state of the tag in the distribution process, so that the resistance to falsification of information is improved.

  Table 5 shows the functions of the A1 and A2 IC tags after being separated from the tag main body when the IC tag of FIG. 1 is applied to distribution management. Since the parts A1 and A2 have an external interface and a power supply circuit independently, as shown in Table 5, the parts A1 and A2 have a function as an IC tag, and data management is easy. That is, the tag (A1) after separation can perform communication control with the outside, read-only the storage area 1 of the storage device 1, and read data 1 from the storage area 1 of the storage device 1. The tag (A2) after separation is the communication control outside the tag (A2), the read-only storage areas 1 and 2 of the storage device 2, the data 1 and 2 from the storage areas 1 and 2 of the storage device 2 Reading can be performed. The tag (A3) after separation is to perform communication control with the outside of the tag (B), read-only storage areas 1 and 2 of the storage device 3, and write / read data 3 to / from the storage area 3 of the storage device 3 Can do.

  In the above-described embodiment, the exchange of information between the tag and the outside has been described as an example of a non-contact type tag using radio represented by radio waves, but the medium for exchanging information is radio waves. It is not limited and magnetism may be used. Moreover, it is not limited to a non-contact type, You may use a contact-type tag.

  Moreover, in the said Example, when Ak was cut | disconnected, the signal track | line Lk was given as an example and demonstrated. However, it is essential that the electrical signal connection between ICk and ICk + 1 is disconnected by disconnecting Ak, and it is not essential that the signal line is disconnected. Therefore, the configuration of the signal line Lk is not limited to the configuration straddling the tag separation line. For example, inductive coupling or capacitive coupling is used between the line patterns facing each other in the vicinity of the separation line. Thus, the electrical signal connection between ICk and ICk + 1 is performed, and the coupling may be weakened or eliminated by separating the tag.

  Further, instead of cutting the line by separating the tag, the portion A and the portion B of the tag may overlap in a partial region, and the electrical connection may be eliminated by separating this overlap. In this case, an adhesive tape or the like may be attached to the overlapping portion so that it can be removed as appropriate.

  As described above, when the tag according to the present embodiment is used, unlike the conventional single-function IC tag, it is possible to easily change the function of the IC tag without using mechanical means. At this time, the external appearance of the IC tag is changed by separating the detachable portion, and the state of the RFIC tag can be easily grasped visually without using a reader / writer device.

  Further, since the tag function change and data input / output can be restricted according to the tag separation state, security against data tampering can be improved. Furthermore, by sharing the tag function among a plurality of ICs, it is possible to prevent an appropriate function change from occurring when the separable part is not separated according to the order, and the tag is normally separated according to the rules. By doing so, security in a system using a tag can be improved. Further, it is possible to obtain an excellent effect different from that of a conventional IC tag, such that the separable part after the separation can be used as an independent IC tag.

  The present invention can be applied to a distribution system using tags.

The block diagram of the IC tag used as the premise of this invention in which the number n of the parts which can be separated from a tag main body is n = 2. The perspective view which shows the structure of the IC tag of FIG. It is a functional block diagram which shows the structural example of IC1. It is a functional block diagram which shows the structural example of IC2. It is a functional block diagram which shows the structural example of IC3. 3 is a functional block diagram illustrating a configuration example of an A1 disconnection determination circuit 1. FIG. 3 is a functional block diagram illustrating a configuration example of an A1 disconnection determination circuit 2. FIG. 3 is a functional block diagram illustrating a configuration example of an A2 disconnection determination circuit 1. FIG. 3 is a functional block diagram illustrating a configuration example of an A2 disconnection determination circuit 2. FIG. 3 is a functional block diagram illustrating a configuration example of a storage device 1. FIG. 3 is a functional block diagram illustrating a configuration example of a storage device 2. FIG. 3 is a functional block diagram illustrating a configuration example of a storage device 3. FIG. It is a figure which shows the structural example of the management system using the conventional IC tag. It is a perspective view which shows the structure of the conventional IC tag.

Explanation of symbols

A1, A2: IC tag detachable part, B: Non-detachable part (tag body), 1, 2, 3, ... antenna, 10 ... IC1, 20 ... IC2, 30 ... IC3, L1, L2 ... signal line .

Claims (17)

N (n is a natural number of n ≧ 1) from A1 to An, and a part B other than the separable part from A1 to An, and the separable part Ak (k is 1 ≦ k ≦ n natural number), each of which is provided with a tag ICk,
A tag ICn + 1 provided in the portion B;
A signal line Lk that electrically couples the ICk and the ICk + 1 and that disconnects the electrical signal connection when the Ak is disconnected;
An IC tag that detects the separation of Ak and sequentially changes the function of the tag from the first function to the (n + 1) th time each time the detachable portion Ak is sequentially separated from A1 to An. Each of the ICk has a kth function,
2. The IC tag according to claim 1, wherein the ICn + 1 has an (n + 1) th function.   3. The IC tag according to claim 1, wherein at least one of the ICk and the ICk + 1 to ICn + 1 performs function sharing for realizing the k-th function.   4. The IC tag according to claim 3, wherein the ICk and the ICk + 1 perform function sharing for realizing the k-th function.   Any one of IC1 to ICk including at least ICk has a function of suppressing the expression of the (k + 1) th function as the whole tag, according to any one of claims 1 to 4, The IC tag described. A storage device Mk provided in each detachable portion Ak;
A storage device Mn + 1 provided in the portion B,
6. The storage device Mk according to claim 1, further comprising a storage area for storing at least one of data obtained based on the first to k-th functions. The IC tag according to any one of the above items.   The IC tag according to claim 6, wherein the storage device Mk includes a storage area for storing data obtained based on the k-th function.   The IC tag according to claim 6 or 7, wherein the storage device Mk + 1 includes an area for storing data obtained based on the first to kth functions.   The IC according to any one of claims 1 to 8, wherein the IC includes a communication unit that performs communication with an external device and a control unit that controls the communication unit. tag.   The ICk + 1 to ICn + 1 are provided with a read-only circuit that makes the area for storing the data obtained by the k-th function of the storage devices Mk + 1 to Mn + 1 read-only when the Ak is disconnected. The IC tag according to any one of claims 6 to 8, wherein the IC tag is characterized in that:   The IC tag according to claim 6 or 7, wherein the Ak portion separated from the tag main body functions as a single IC tag by maintaining a communication function with the outside. An Lk cut detection device for detecting the cut of the line Lk in the Ak portion;
The IC tag according to claim 11, further comprising: an Ak disconnection determination device that uses a detection result of presence or absence of disconnection of the signal line Lk for determination of disconnection of the Ak.   When the Ak disconnection determination device determines that Ak is disconnected from the tag body, at least the data storage area assigned to the data obtained by the first to kth functions of the storage device Mk is read-only. The IC tag according to claim 12, further comprising a device.   14. The IC tag according to claim 13, wherein the Lk disconnection detection device for the Ak portion detects disconnection of the signal line Lk based on the presence / absence of a signal from ICk + 1. An impedance change detection device that detects a change in impedance of a line that is cut when the Ak part is cut off from the tag across the two areas of Ak and Ak + 1,
The IC tag according to claim 13, further comprising an Ak detachment detection device that determines Ak detachment based on detection results of the Lk detachment detection device and the impedance change detection device. In the detachable portion Ak + 1,
An Lk disconnection detecting device for detecting disconnection of a signal connection by the signal line Lk;
An Ak disconnection determination device that uses the detection result of the presence or absence of disconnection of the signal line Lk to determine whether the Ak is disconnected; and
With
2. The IC tag according to claim 1, wherein the Lk cut detection device of the Ak + 1 portion determines disconnection of the signal line Lk based on the presence or absence of a signal from the ICk. In the Ak + 1 part,
An impedance change detection device that detects a change in impedance of a line that is cut when the Ak part is cut off from the tag across the two areas of Ak and Ak + 1,
17. The IC tag according to claim 16, wherein the Ak disconnection determination device determines Ak disconnection using detection results of the Lk disconnection detection device and an impedance change detection device.

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