JP5282535B2 - State change detection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a state change detection system for accurately ascertaining the using state of an article, and accurately discriminating a plurality of using states. <P>SOLUTION: The state change detection system is provided with a non-contact IC tag device having an IC chip 11 connected to a resonance circuit configured of a capacitor and an antenna coil, and a storage means for recording the state change of the non-contact IC tag device. The resonance circuit is configured of a capacitor 15 for resonance frequency adjustment formed in parallel with a capacitor 13 and/or a coil 14 for resonance frequency adjustment formed in parallel with the antenna coil 12. The non-contact IC tag 1 is provided with cutting parts 2 and 3 for removing a part or the whole of the capacitor 14 for resonance frequency adjustment and/or the coil 15 for resonance frequency adjustment, and the resonance frequency of the resonance circuit is shifted by disconnecting the cutting part. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a state change detection system using a non-contact IC tag device that communicates information in a non-contact manner, and in particular, a state in which a change in the state of an article to be physically cut can be confirmed every time it is used. It relates to a change detection system.

  Conventionally, in order to identify an article, there are a plurality of resonance circuits, and the relative relationship of the resonance characteristics between the resonance circuits represents unique information, and an ID tag (for example, Patent Document 1), and a shoplifting anti-theft device for identifying a stolen article by using a wireless tag whose transmission frequency can be set by setting data consisting of a plurality of bits (see, for example, Patent Document 2). The articles are identified by using these.

  However, the identification of such an article is made by determining whether or not the product has been officially purchased based on the presence or absence of a tag, and identifying the type by a set resonance frequency, or by comparing the relative frequency of a plurality of resonance circuits. By making the relationship different for each article, the type of the article is identified, and the state of the article cannot be identified.

Therefore, as an item that can identify the state of an article, an IC tag such as a resonance tag (see, for example, Patent Document 3) having a resonance circuit set so that the resonance frequency is changed by a change in external factors. A system using an IC tag for detecting an environmental change of an article is known.
JP 2003-271912 A JP 2000-259958 A JP 2005-135132 A

  However, an IC tag that can detect such a change in external factor is to detect that the external factor has changed due to a change in the capacitance of the ceramic capacitor due to a temperature change using a ceramic capacitor or the like. This was achieved by providing a special element, which was influenced by external factors.

  The present invention is capable of accurately grasping the use state of an article without using such a special element, and capable of accurately discriminating a plurality of use states. The purpose is to provide a system.

  In order to achieve the above object, a state change detection system according to the present invention includes a non-contact IC tag device having an IC tag circuit including an IC chip connected to a resonance circuit including a capacitor and an antenna coil. In a state change detection system comprising storage means for recording a state change of a contact IC tag device, the resonance circuit is connected to one or more resonance frequency adjusting capacitors and / or antenna coils formed in parallel to the capacitor. The non-contact IC tag includes a resonance frequency adjustment capacitor and / or a part of the resonance frequency adjustment coil by disconnecting the wiring of the resonance circuit, or one or more resonance frequency adjustment coils formed in parallel with each other. It has a cutting part that can be removed entirely, and the resonance frequency of the resonance circuit shifts when the wiring is disconnected by the cutting part. It is an feature.

  The IC tag circuit of the non-contact IC tag device used in the present invention has an IC chip having at least a memory and a control unit for reading information from the memory, like the conventional non-contact IC tag. Is connected to a resonance circuit including an antenna coil and a capacitor for transmission and reception, and is configured to transmit information read from a memory or the like via the antenna.

  In the non-contact IC tag device used in the present invention, the resonance circuit connected to the IC chip of such an IC tag circuit has a resonance frequency adjusting capacitor and / or an antenna coil formed in parallel with the capacitor. Resonance frequency adjusting coils formed in parallel are formed, and these capacitors and coils for adjusting the resonance frequency are used for identifying the state of the article. The non-contact IC tag device used in the present invention has a cutting section that can disconnect a wiring from such a resonance circuit and remove a part or all of the capacitor and / or coil for adjusting the resonance frequency. Yes.

  By disconnecting the wiring by the cut portion, a part or all of the resonance frequency adjusting capacitor and / or coil is removed from the resonance circuit, and the resonance circuit having a reduced capacitance and / or inductance has a resonance frequency of Shift and the reaction with the reader / writer changes. Due to this reaction change, for example, the minimum communicable power or the maximum communication distance between the non-contact IC tag and the reader / writer changes. By detecting this, it is possible to easily determine whether or not the reaction has changed. . When the capacitance decreases, the resonance frequency shifts to the high frequency side, and when the inductance decreases, the resonance frequency shifts to the low frequency side.

  Moreover, although the above-mentioned non-contact IC tag device has explained the case where one IC tag circuit is used, this may be a non-contact IC tag device having a plurality of IC tag circuits. By configuring each IC tag circuit to have one or more resonance frequency adjustment capacitors and / or resonance frequency adjustment coils, the number of states that can be further identified can be increased depending on the combination of the states of the IC tag circuits. Can be increased.

  However, at this time, the resonance frequency is shifted by removing the resonance frequency adjusting capacitor and / or coil, and the minimum communicable power or the maximum communication distance is changed based on this shift. When some or all of the resonance frequency adjustment capacitors and / or coils are removed, the resonance frequency is shifted so that only one of the resonance circuits can change the minimum communicable power or the maximum communication distance, and other resonances. It is preferable that the shift of the resonance frequency of the circuit does not change the minimum communicable power or the maximum communication distance.

  That is, even if the resonance frequency adjustment capacitor and / or coil is removed and the resonance frequency changes, if the change does not affect the minimum communicable power or the maximum communication distance, this application This is because the identification number of the article of the invention is not affected.

  This is because, if one change can be read out of the resonance circuit of the non-contact IC tag device, it can be read that the state has changed, and at the same time, the resonance frequency of the two resonance circuits is greatly shifted. This is because the number of times of state change identification is reduced. In other words, it is preferable that the change in the minimum communicable power or the maximum communication distance occurs at a different cutting unit for each IC tag circuit.

  A non-contact IC tag device provided with a plurality of IC tag circuits in this way resonates by disconnecting wiring from at least one of the resonance circuits provided for each of the plurality of IC tag circuits (that is, for each IC chip). The frequency adjusting capacitor and / or the cutting portion capable of removing a part or all of the coil is provided. The cutting unit may be configured such that a part or all of the resonance frequency adjusting capacitor and / or coil is removed from one resonance circuit, and the resonance frequency adjusting capacitor and / or coil is respectively removed from a plurality of or all resonance circuits. A part or all of the above may be removed.

  By disconnecting the wiring by this cutting part, the resonance frequency shifts to the high frequency side, and the reaction with the reader / writer changes in the resonance circuit in which the capacitance is reduced by removing the resonance frequency adjusting capacitor from the resonance circuit. To come. In addition, by disconnecting the wiring by this cutting portion, the resonance circuit whose resonance frequency is reduced by removing the resonance frequency adjusting coil from the resonance circuit, the resonance frequency is shifted to the low frequency side and the reader / writer is connected. The reaction will change. Due to such a change in reaction, for example, the minimum power or the maximum communication distance that can be communicated between the IC tag circuit and the reader / writer changes. By detecting this, it is possible to easily determine whether there is a change in the state of the article. Can do. Here, when the resonance frequency is changed by removing the resonance frequency adjustment capacitor and / or the resonance frequency adjustment coil, when the minimum communicable power or the maximum communication distance exceeds a predetermined threshold, Suppose there is a change.

  Further, the resonant frequency that shifts in this way is shifted from a frequency lower than the carrier wave transmitted by the reader / writer communicating with the non-contact IC tag to a state of a frequency close to (substantially coincident with) the carrier wave, and Shift to a higher frequency state than the carrier, or shift from a higher frequency state than the carrier to a frequency state close to (substantially coincident with) the carrier, and further to a higher frequency state than the carrier. It is preferable to shift. This is because when the frequency of the carrier wave and the resonance frequency are sufficiently close, the lowest communicable power is the smallest amount of power and the maximum communication distance is the longest, which is extremely effective in detecting the change. . Thus, the state change can be identified effectively by passing the frequency close to the carrier wave.

  As described above, the cutting part is for disconnecting a part of the resonance circuit. In the present invention, by disconnecting the wiring of the plurality of resonance circuits by the cutting part, a plurality of IC tag circuits are provided. This is an important component that makes it possible to determine the usage state by changing the minimum communicable power or the maximum communication distance of at least one of the (ie, the IC chip).

  Here, the lowest communicable power is the lowest power that enables the reader / writer and each IC tag circuit of the non-contact IC tag device to communicate with each other. The communication power set in the reader / writer that communicates with the non-contact IC tag device used in the invention. In other words, the lowest communicable power in the present invention is a communication power that is appropriately set in the reader / writer, and is the lowest that enables communication with the IC chip of the IC tag circuit.

  Therefore, in the present invention, “the minimum communicable power changes” means the lowest setting that allows communication with the IC chip of the IC tag circuit before and after disconnection among a plurality of communication powers set in the reader / writer. It means that electric power changes. For example, when the reader / writer has two power settings of high power and low power, communication with only high power was possible before disconnection, but communication with low power after disconnection was possible. It is also possible, and communication with low power becomes impossible by disconnecting another cutting part, so that only communication with high power can be performed, the lowest communicable power is reduced from high power to low power, Furthermore, what changes to high electric power is illustrated.

  The maximum communication distance refers to the maximum communication distance at which the reader / writer and each IC tag circuit of the non-contact IC tag device can communicate with each other. When a certain amount of power is supplied, this is the distance set appropriately to communicate with the IC chip of each IC tag circuit of the non-contact IC tag device used in the present invention. The range in which communication with the reader / writer is possible It is shown.

  Therefore, in the present invention, “the maximum communication distance changes” means that when a certain communication power is supplied from the reader / writer, the set distance at which communication with the IC chip of the IC tag circuit is possible before and after disconnection. It means changing. For example, when the distance between the reader / writer and the IC tag circuit is provided in two stages, long and short, communication at a short distance is possible before disconnection at a certain cutting section, and communication at a long distance is not possible However, long-distance communication is possible after disconnection, the maximum communication distance is extended, and further disconnection is disconnected, this time it becomes impossible to communicate over long distances, only communication over short distances is possible For example, the maximum communication distance is changed from a short distance to a long distance, and further to a short distance.

  As described above, the non-contact IC tag device used in the present invention differs in the minimum communicable power or the maximum communication distance of the IC chips of the plurality of IC tag circuits included in the non-contact IC tag device. It is preferable that it is configured so as to occur at the time of disconnection operation of the cutting portion, and in this way, when the disconnection operation is performed a plurality of times, the disconnection is actually disconnected, and the resonance frequency is the lowest communicable power or Only one IC chip changes as the maximum communication distance is changed.

  That is, in one IC tag circuit, for example, as shown by the solid line in FIG. 1, when an inductance change occurs, the resonance frequency is low because a large power is required like the resonance frequency f1. Shifting to the frequency side becomes f2, and communication is possible even with low power. Further, when the inductance change occurs, the resonance frequency further shifts to the low frequency side to become f3, and communication with low power becomes impossible, and only communication with high power is possible.

  At this time, the lowest communicable power can only distinguish between two states, large and small. FIG. 1 is a diagram showing the relationship between the change in resonance frequency and the lowest communicable power ratio. Here, the frequency of the carrier wave of the communication signal of the reader / writer is f2.

  Since the state change detection system of the present invention has a storage means for recording the state change of the non-contact IC tag device described above, for example, when it has one IC tag circuit described in FIG. By measuring the minimum communicable power, the state change of the non-contact IC tag device can be accurately detected. At this time, by recording the history of state changes, the identifiable number can be utilized to the maximum as compared with the case where there is no such storage means. It can also be.

  That is, when the minimum communicable power changes as shown in FIG. 1, both the large power when not in use and the large power after the resonance frequency changes twice, the communicable minimum power is both large power, Although it cannot be identified by this alone, the state of the non-contact IC tag device can be identified once there is a history that the lowest communicable power has become low. Further, here, the case where the inductance is changed due to the disconnection of the resonance frequency adjusting coil is described. However, when the capacitance is changed due to the disconnection of the resonance frequency adjusting capacitor, the low frequency is contrary to the movement of FIG. The resonance frequency can be changed from the high frequency side to the high frequency side. For example, the resonance frequency adjusting capacitor is disconnected from the non-contact IC tag whose resonance frequency is f3, and the capacitance is changed to f3 → f2. And the resonance frequency can be changed from f2 to f1.

  As the resonance frequency changes, the minimum communicable power also changes. By recording this change in the storage means, the current state of the non-contact IC tag can be identified from the history. As a result, the use state of the article to which the non-contact IC tag device is applied can be accurately identified. And by recording this history, it is possible to record the resonance frequency change by reciprocating as many times as the number of capacitors and coils for adjusting the resonance frequency formed in parallel. Infinite state changes can be identified.

  In addition, when a plurality of IC tag circuits are used, different usage states can be determined depending on the combination of the minimum communicable power or the maximum communication distance of the IC chip of each IC tag circuit. For example, when two IC tag circuits (that is, two IC chips) are used, four usage states can be identified by a combination of the lowest communicable power or the maximum communication distance, and three IC tag circuits (that is, two IC chips). In the case of using one IC chip), eight usage states can be identified, and by increasing the number of IC tag circuits used (that is, the number of IC chips used), the number of used state identifications can be further increased. be able to.

  In the above description, the description has been given of the case where the lowest communicable power and the maximum communication distance are set in two stages. However, in the case of further three stages, for example, in terms of the lowest communicable power, the reader / When the writer has three power settings of high power, medium power and low power, as shown in FIG. 2, only communication with high power was possible before disconnection, Each time the wire is disconnected and the inductance changes, communication with medium power and low power is possible, and further communication with low power is impossible due to wire disconnection, and communication with medium power and high power is possible, and then the medium is disconnected. If the minimum power that can be communicated is changed from high power → medium power → small power → medium power → high power so that communication with power becomes impossible and only communication with high power can be performed. Knowledge of state change with one IC chip The number increases. FIG. 2 shows the relationship between the communicable minimum power ratio and the resonance frequency at this time, and the frequency of the carrier wave of the reader / writer is f3.

  In this way, combining the identification of the state by one IC chip (so that the communication power or the communication distance can be measured in a plurality of stages) and the identification of the communication state by combining a plurality of IC chips. Thus, the optimum identifiable number according to the applied article can be set as appropriate.

  Further, the IC chip controller of the non-contact IC tag device used in the present invention reads an IC chip identification code from the memory. The IC chip identification code is stored in advance in, for example, a read-only memory (ROM), and based on this, the minimum communicable power or the maximum communication distance of each IC chip can be confirmed.

  Here, since the non-contact IC tag device used in the present invention does not require a battery-driven element or the like, it can be configured without a battery. In this case, a nonvolatile memory may be used as the memory. However, it is also possible to use a volatile memory so that power is supplied from the battery to the memory. When using a battery here, for example, if a clock is provided so that time data can be obtained, the time when the resonance circuit is disconnected is stored in the memory, and not only the current status of the use state is grasped, but also when it is used It is also possible to grasp information on whether or not the information has been made, and it is possible to grasp even information on the state change of the article.

  A specific method of transmitting / reading a signal via an antenna is realized by bringing an article having a non-contact IC tag device built in the reader / writer close to a predetermined distance, and the reader / writer determines whether communication is possible. Confirmation and reading of memory contents can be performed. At this time, the minimum communicable power and / or the maximum communication distance are stored in a storage unit such as a HDD or IC chip memory such as a computer or server connected to the reader / writer, and the state change is recorded. Thus, the state change history can be referred to, and the current state of the non-contact IC tag device can be accurately identified with reference to the history. It is preferable that the state change can be read at all times. When the state change is temporarily read, the state change during that time must be recorded in the memory of the IC chip. Don't be.

  Here, the history of state change is performed by recognizing that the state has changed when the minimum communicable power and / or the maximum communication distance has changed, and recording this, and this recording method is the individual state. Is not particularly limited as long as it can be identified. For example, every time the state changes, the value of state 1, state 2, state 3,... Is increased, or the lowest communicable power changes from large to medium to small to large to medium to small. In the case of the configuration, there is a case where the current state is identified by the state cycle number, the state cycle number 3 and the lowest communicable power, with a cycle of large → medium → small as one cycle. .

  In the present invention, the antenna coils in the plurality of resonance circuits may all be wound in the same direction, or the winding direction of one or more coils may be reversed to suppress mutual interference. . The number of turns may be all the same, or one or more may be different.

  Also, the antenna coils may be formed in the same shape, or one or more antenna coils may be formed in different shapes. In the case of different shapes, the reader / writer Since the response to the antenna is different, the IC chip can be easily distinguished. At this time, the response of the reader / writer to the antenna may be different, for example, by changing the number of turns of the antenna coil.

  Next, the resonance frequency adjusting coil used in the present invention is configured so that an arbitrary inductance is cut when the cutting portion is disconnected in advance, and a resonance circuit connected to a plurality of IC chips. It is preferable to provide such that the resonance frequency of at least one of the resonance circuits changes. In this way, when the cutting section is disconnected, the resonance circuit whose minimum communicable power or maximum communication distance changes becomes one IC chip for each cutting section, so that the identification state is efficiently determined. be able to.

  Further, the resonance frequency adjusting capacitor used in the present invention is configured such that an arbitrary capacitor is cut in advance, and the resonance circuit connected to the plurality of IC chips when disconnected at the cutting portion. It is preferable to provide such that the resonance frequency of at least one of the resonance circuits changes. At this time, it is preferable that the resonance circuit in which the lowest communicable power or the maximum communication distance changes when disconnected at the cutting unit is one IC chip for each cutting unit.

  The capacitor and the resonance frequency adjusting capacitor used here are not particularly limited, and a known capacitor may be formed, and a variable capacitor may be used here. If a variable capacitor is used, after manufacturing a non-contact IC tag, set it to an arbitrary capacitance, and select which resonance circuit's resonance frequency will change when any cut part is disconnected This is preferable in that it can be set according to the application.

  In the present invention, the IC chip is connected to all the resonance circuits of the non-contact IC tag device to form the IC tag circuit. Therefore, the supply power of the lowest communicable power is maintained while the circuit is functioning. It is possible to confirm whether communication was not possible due to a lack, or whether communication was not possible due to a failure such as a physical circuit disconnection, and it was easy to confirm whether the function as a non-contact IC tag device was secured. It can also be confirmed.

According to the state change detection system of the present invention, the current state of an article can be grasped by communication with a reader / writer, and the use state of the article can be confirmed. Further, by providing a plurality of resonance frequency adjusting capacitors and a plurality of resonance frequency adjusting coils, the number of identification states can be theoretically infinite. Furthermore, the state of use of the article can be grasped more accurately by storing the time of state change in the memory.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 3 shows an equivalent circuit of a non-contact IC tag device used in the state change detection system of the present invention. The state change detection system according to this embodiment includes the non-contact IC tag device and storage means for storing changes in the minimum communicable power or the maximum communication distance of the non-contact IC tag device.

  As shown in FIG. 3, the non-contact IC tag device 1 has an IC chip 11, and this IC chip 11 is connected to a resonance circuit including an antenna coil and a capacitor. And a resonance frequency adjusting coil formed in parallel. That is, the IC chip 11 is connected to a resonance circuit formed by the antenna coil 12, the capacitor 13, and the resonance frequency adjusting coil 14 (14-1 to 14-2).

  These antenna coil, capacitor, resonance frequency adjusting coil, and wiring portion can be formed by directly patterning on an insulating sheet or insulating substrate (not shown) by a well-known photolithography technique or printing technique, and other passive elements. The active element is electrically connected to these wiring portions and mounted on the insulating sheet. These wiring parts and mounting parts are covered with, for example, a synthetic resin film (not shown), and can be integrated by pressure heating.

  The non-contact IC tag device 1 has cutting portions 2 to 3, and by disconnecting the cutting portion 2, a part of the resonance circuit is disconnected and the resonance frequency adjusting coil 14-1 is connected to the non-contact IC tag device 1. By cutting off the cutting portion 3, the resonance frequency adjusting coil 14-2 can be removed from the circuit by further disconnecting a part of the resonance circuit.

  4 shows a perspective view in which the non-contact IC tag device 1 shown in FIG. 3 is applied to a medicine package sheet. The non-contact IC tag device 1 is configured to be enclosed in a medicine package sheet 21. Yes. The medicine pack sheet 21 is easily cut by forming perforations or the like in the part corresponding to the cutting part, and the medicine packs 22 to 23 for a single use amount are fixed to the part to be cut. . When using the medicine, the resonance circuit is partially disconnected by cutting the medicine package from the sheet along the perforation (corresponding to the cutting portion), and the resonance frequency adjusting coils 14-1 and 14-2. Are removed from the circuit.

  First, in an unused state, the medicine package sheet 21 is not cut off as shown in FIG. 4, and the resonance circuit connected to the IC chip 11 exists in the state shown in FIG. To do.

  Then, at the first use, the cutting part 2 is cut to use the medicine package 22, but the resonance frequency adjusting coil 14-1 is cut and removed from the resonance circuit by this, so that the lowest communicable power or maximum communication is possible. The inductance changes as the distance changes, and the minimum communicable power or the maximum communication distance changes compared to when not in use, and this is a storage means (computer HDD) connected to the reader / writer. Etc.) as a history.

  Further, when the cutting part 3 is cut to use the medicine pack 23, the resonance frequency adjusting coil 14-2 is cut and removed from the resonance circuit, and the minimum communicable power or the maximum communication distance changes. The inductance is changed, and the minimum communicable power or the maximum communication distance is changed as compared with the unused state, and this is stored as a history in the storage means connected to the reader / writer.

  Next, changes in the minimum communicable power and resonance frequency of the IC chip 11 when these disconnections are performed will be described.

  Note that the communication power of the reader / writer and the setting of the communication distance with the IC tag may be appropriately selected depending on the communication conditions. In the embodiment in this specification, for example, two types of communication power of 100 mW and 10 mW are used. It is assumed that the communication distance between the reader / writer and the IC tag is 27 mm.

  FIG. 5 shows the relationship between the usage state of the medicine package sheet 21 of FIG. 4 and the resonance frequency and the lowest communicable power for each IC chip.

  First, the unused medicine package sheet 21 is in a state as shown in FIG. 4, and the resonance frequency at this time is such that the resonance frequency of the IC chip 11 is 13.56 MHz as shown in state 1. Is in a large state (H), and the lowest communicable power is in a large power state.

  When the cutting unit 2 is cut at the time of use, the resonance frequency of the IC chip 11 is changed to approximately 13.56 MHz (M) as shown in the state 2 so that the minimum communicable power can be reduced. Thus, it can be seen that the lowest communicable power of the IC chip 11 is low and the use state has changed.

  Further, when the cutting unit 3 is cut, the resonance frequency of the IC chip 11 is changed as shown in the state 3 and is smaller than 13.56 MHz (L), and the lowest communicable power is also a state of high power. It has become.

  As described above, the non-contact IC tag device used in the present invention can check the usage state by changing the minimum communicable power of the IC chip by cutting the cutting unit, but only the minimum communicable power is seen. Since both state 1 and state 3 can only be communicated with high power and cannot be identified, the history information stored in the storage means is taken into account, so that no history information exists. 1 and the state 3 in which the history information in which the lowest communicable power is changed from high power → low power → high power can be identified.

  At this time, more accurate usage information can be obtained by storing in the memory the time at which the resonance frequency has changed. Further, if the setting of the minimum communicable power or the maximum communication distance is increased, many medicine packages can be provided.

(Second Embodiment)
Next, a state change detection system using a non-contact IC tag device provided with a resonance frequency adjusting capacitor so that the resonance frequency can be adjusted not only in the coil but also in the capacitor will be described. The non-contact IC tag device used here is different from the first embodiment only in that a resonance frequency adjusting capacitor is formed in parallel to the capacitor. FIG. 6 shows an equivalent circuit of a non-contact IC tag device used in the present invention.

  As shown in FIG. 6, the non-contact IC tag device 31 has an IC chip 41, which is connected to a resonance circuit composed of an antenna coil and a capacitor, and further in parallel with the antenna coil. The formed resonance frequency adjusting coil is connected to the resonance frequency adjusting capacitor formed in parallel with the capacitor. That is, the IC chip 41 is formed by the antenna coil 42, the capacitor 43, the resonance frequency adjusting coils 44 (44-1 to 44-2), and the resonance frequency adjusting capacitors 45 (45-1 to 45-2). Connected to the resonant circuit.

  These antenna coil, capacitor, resonance frequency adjustment coil, resonance frequency adjustment capacitor and wiring portion are formed by directly patterning on an insulating sheet or an insulating substrate (not shown) by a known photolithography technique or printing technique. The other passive / active elements are electrically connected to these wiring portions and mounted on the insulating sheet. These wiring parts and mounting parts are covered with, for example, a synthetic resin film (not shown), and can be integrated by pressure heating.

  The non-contact IC tag device 31 has cutting portions 32 to 35. By cutting the cutting portion 32, a part of the resonance circuit is disconnected, and the resonance frequency adjusting coil 44-1 is connected to the non-contact IC tag device 31. By cutting off the cutting part 33, part of the resonance circuit can be further disconnected to remove the resonance frequency adjusting coil 44-2 from the circuit, and by cutting off the cutting part 34, the resonance circuit can be removed. The resonant frequency adjusting capacitor 45-1 can be removed from the circuit by further disconnecting part of the capacitor, and by disconnecting the cutting part 35, part of the resonant circuit can be further disconnected to remove the capacitor 45-2 from the circuit. Be able to.

  And this non-contact IC tag device 31 can be applied to a thing accompanied by a physical cutting work at the time of use of a medicine package sheet etc. like a 1st embodiment, and cutting work is sequentially carried out by cutting parts 32-35. Thus, the resonance circuit is partially disconnected, and the resonance frequency adjusting coil or the resonance frequency adjusting capacitor is removed from the circuit. At this time, the resonance frequency adjusting coil and capacitor to be removed by disconnection are disconnected in order from the outermost circuit that does not affect the other resonance frequency adjusting coil and resonance frequency adjusting capacitor. Is.

  First, in an unused state, nothing is cut off as shown in FIG. 6, and the resonance circuit connected to the IC chip 41 exists in the state shown in FIG.

  Then, at the first use, the cutting portion 32 is cut. As a result, the resonance frequency adjusting coil 44-1 is cut and removed from the resonance circuit, and the inductance changes.

  Similarly, the cutting unit 33 cuts the resonance frequency adjusting coil 44-2, the cutting unit 34 cuts the resonance frequency adjusting capacitor 45-1, and the cutting unit 35 cuts the resonance frequency adjusting capacitor 45-2. The resonance frequency adjustment coil or the resonance frequency adjustment capacitor is removed from the resonance circuit, respectively, and the minimum communicable power or the maximum communication distance changes when the resonance frequency adjustment coil or the resonance frequency adjustment capacitor is disconnected. Inductance change or capacitance change occurs. At this time, the inductance of the resonance frequency adjusting coil and the capacitance of the resonance frequency adjusting capacitor can be arbitrarily set.

  By such an operation of cutting a part of the resonance circuit by the cutting unit, the minimum communicable power or the maximum communication distance of the resonance circuit changes compared to before the disconnection, and this is stored in the storage means connected to the reader / writer. Saved as history.

  The change of the minimum communicable power due to the disconnection of the cutting units 32 and 33 shows the same change (f1 → f2 → f3) as that shown in the first embodiment. By disconnecting 34 and 35, the resonance frequency can be changed in the opposite direction of f3 → f2 → f1, and accordingly, the lowest communicable power changes from high power → low power → high power.

  The change in the minimum communicable power is recorded as a history in a storage means (not shown), and the usage state of the article to which the non-contact IC tag device is applied at the time of measurement is identified by considering the history data before that. In addition, it is possible to identify even what type of usage has gone through.

  In this embodiment, two resonance frequency adjustment coils and two resonance frequency adjustment capacitors are provided so that the resonance frequency reciprocates once. It can be used to reciprocate many times around the carrier wave, and theoretically it is possible to identify an infinite number of states.

(Third embodiment)
Next, a state change detection system using a non-contact IC tag device provided with a plurality of IC chips will be described. FIG. 7 shows an equivalent circuit of the non-contact IC tag device used in the present invention.

  As shown in FIG. 7, the non-contact IC tag device 51 has three IC chips, that is, an IC chip 61, an IC chip 71, and an IC chip 81. These IC chips are resonant circuits each including a capacitor and an antenna coil. The resonance circuit further includes a resonance frequency adjusting coil formed in parallel with the antenna coil.

  That is, the IC chip 61 is connected to a resonance circuit formed by an antenna coil 62, a capacitor 63, and a resonance frequency adjusting coil 64 (64-1 to 64-5), and the IC chip 71 is connected to the antenna coil 72. The IC chip 81 is connected to a resonance circuit formed by a capacitor 73 and a resonance frequency adjustment coil 74 (74-1 to 74-5). The IC chip 81 includes an antenna coil 82, a capacitor 83, and a resonance frequency adjustment coil 84 ( 84-1 to 84-5).

  These antenna coil, capacitor, resonance frequency adjusting coil, and wiring portion can be formed by directly patterning on an insulating sheet or insulating substrate (not shown) by a well-known photolithography technique or printing technique, and other passive elements. The active element is electrically connected to these wiring portions and mounted on the insulating sheet. These wiring parts and mounting parts are covered with, for example, a synthetic resin film (not shown), and can be integrated by pressure heating.

  In the non-contact IC tag device 51, cutting parts 52 to 56 are formed. By cutting the cutting parts, a part of the three resonance circuits is disconnected and the resonance frequency adjusting coil is removed from the circuit. Be able to.

  And this non-contact IC tag device 51 can be applied to a thing accompanied by a physical cutting work at the time of use of a medicine package sheet etc. like a 1st embodiment, and cutting work is sequentially carried out by cutting parts 52-56. Thus, the resonance circuit is partially disconnected, and the resonance frequency adjusting coil is removed from the circuit. At this time, the resonance frequency adjusting coils to be removed by disconnection are sequentially disconnected from those formed on the outermost side of the circuit that does not affect the other resonance frequency adjusting coils.

  First, in the unused state, nothing is cut off as shown in FIG. 7, and the resonance circuits connected to the IC chips 61, 71, 81 exist in the state shown in FIG.

  Then, at the first use, the cutting part 52 is cut, whereby the resonance frequency adjusting coils 64-1, 74-1, and 84-1 are cut, respectively, and the inductance of the resonance circuit changes.

  Similarly, the cutting portion 53 cuts the resonance frequency adjusting coils 64-2, 74-2, and 84-2, and the cutting portion 54 cuts the resonance frequency adjusting coils 64-3, 74-3, and 84-3. The resonance frequency adjusting coils 64-4, 74-4, and 84-4 are cut by the section 55, and the resonance frequency adjusting coils 64-5, 74-5, and 84-5 are cut by cutting the cutting section 56, respectively. The frequency adjustment coil is removed from the resonance circuit, and when the specific resonance frequency adjustment coil is disconnected, an inductance change occurs such that the minimum communicable power or the maximum communication distance changes. At this time, the inductance of the resonance frequency adjusting coil can be set arbitrarily, and the resonance frequency adjusting coil that is not involved in the change of the minimum communicable power or the maximum communication distance can be set without providing the coil itself. It may be 0.

  Next, changes in the minimum communicable power and resonance frequency of each IC chip when this disconnection work is performed will be described.

  FIG. 8 shows the relationship between the usage state of the non-contact IC tag device 51 of FIG. 7 and the resonance frequency and the lowest communicable power for each IC chip.

  First, the unused non-contact IC tag device 51 is in a state as shown in FIG. 7, and the resonance frequency at this time is as shown in state 1, IC chip 61, IC chip 71, IC All resonance frequencies of the chip 81 are in a state (H) higher than 13.56 MHz, and the lowest communicable power is all in a state of high power, that is, high power-high power-high power.

  When the cutting unit 52 is cut at the first use, only the resonance frequency of the IC chip 81 is changed to about 13.56 MHz (M) as shown in the state 2, so that the minimum communicable power is small. It can be seen that the minimum communicable power of the IC chip is a combination of high power-high power-low power in the order of the IC chips 61, 71, 81, and the use state has changed.

  Next, when the cutting unit 53 is cut, only the resonance frequency of the IC chip 61 is changed to approximately 13.56 MHz as shown in the state 3, so that the lowest communicable power can be reduced. It can be seen that the lowest communicable power is a combination of low power-high power-low power in the order of the IC chips 61, 71, 81 and the use state has changed.

  Further, when the cutting unit 54 is cut, only the resonance frequency of the IC chip 71 is changed as shown in the state 4 to be approximately 13.56 MHz, so that the lowest communicable power can be reduced and the communication of the IC chip can be reduced. The lowest possible power is all in a low power state.

  Next, when the cutting unit 55 is cut, only the resonance frequency of the IC chip 81 changes as shown in the state 5 and becomes a state (L) smaller than 13.56 MHz, and the minimum communicable power becomes large. It can be seen that communication is not possible at a small size, and the minimum communicable power of the IC chip is a combination of low power-low power-high power in the order of the IC chips 61, 71, 81, and the usage state has changed.

  Finally, when the cutting unit 56 is cut, only the resonance frequency of the IC chip 61 is changed as shown in the state 6 so as to be higher than 13.56 MHz, and the minimum communicable power becomes large and small. Then, communication becomes impossible, and it can be seen that the lowest communicable power of the IC chip is a combination of low power-high power-high power in the order of the IC chips 61, 71, 81, and the use state has changed. Changes in minimum communicable power and resonance frequency when these operations are performed are collectively shown in FIG.

  As described above, the IC tag device having three IC chips changes the minimum communicable power of the IC chip in different cutting units, so that which cutting unit is disconnected is the minimum communicable power of the IC chip. It can be understood by checking the combination and the usage state can be confirmed. At this time, since the change in the resonance frequency is recorded in the storage means, even if the combination of the overlapping minimum communicable powers is used, the current state can be confirmed by referring to the change in the state so far. Moreover, it can also be confirmed whether it is used properly and it can grasp | ascertain a usage condition more correctly.

  More specifically, in the third embodiment, a non-resonant circuit used in the present invention using an IC tag circuit simplified by using a resonance circuit excluding a resonance frequency adjusting coil that is not involved in a change in maximum communicable power. The operation of the contact IC tag device is as follows.

  FIG. 9 shows communication when the cutting unit 52, the cutting unit 53, the cutting unit 54, the cutting unit 55, and the cutting unit 56 are cut in the resonance frequency adjusting coil of the non-contact IC tag device 51 shown in FIG. It is the figure which displayed by removing the inductance of the frequency adjustment coil which is not concerned with the change of the maximum possible electric power from 0, and from the circuit. In this figure, 64-2, 64-5, 74-3, 84-1, and 84-4 remain as the resonance frequency adjustment coils, and other resonance frequency adjustment capacitors are removed.

  When cutting the cutting part 52 in FIG. 9, the resonance frequency adjusting coil 84-1 is disconnected and disconnected, and when the cutting part 53 is cut, the resonance frequency adjusting coil 64-2 is disconnected and disconnected, and the cutting part 54 is cut. Then, the resonance frequency adjusting coil 74-3 is disconnected and disconnected. When the cutting portion 55 is cut, the resonance frequency adjusting coil 84-4 is disconnected and disconnected. When the cutting portion 56 is cut, the resonance frequency adjusting coil 64- 5 is disconnected and disconnected.

  FIG. 10 shows that when the cutting parts 52 to 56 of the non-contact IC tag device 51 are cut by the above procedure, the frequency adjustment coils are disconnected and cut in the above order, and the IC tag circuits 69 to 89 (that is, the IC tag circuits 69 to 89). It is the figure which showed how the resonance frequency of each resonance circuit of chip | tips 61-81 changes. When the cutting units 52 to 56 are cut in order, the resonance frequency of the IC chip 61 changes as (H → H → M → M → M → L), and the resonance frequency of the IC chip 71 (H → H → H → M). → M → M), and the resonance frequency of the IC chip 81 changes (H → M → M → M → L → L). Here, the notation “L” represents a state where the resonance frequency is lower than the frequency of the carrier wave of the communication signal transmitted by the reader / writer, and the notation “M” represents a state where the resonance frequency is close to the frequency of the carrier wave. "Represents a state in which the resonance frequency is higher than the frequency of the carrier wave.

  FIG. 11 is a diagram showing how the minimum communicable power of each of the IC chips 61 to 81 changes according to the change of the resonance frequency. That is, when the cutting units 52 to 56 of the non-contact IC tag device 51 are cut according to the above procedure, the lowest communicable power of the IC chip 61 is (power: large → large → small → small → small → large). The minimum communicable power of the chip 71 (power: large → large → large → small → small → small) and the minimum communicable power of the IC chip 81 changes (power: large → small → small → small → large → large). To do. When the results of FIG. 10 and FIG. 11 are summarized, the same result as the table of FIG. 8 is obtained.

  Here, when the cutting units 52 to 56 of the non-contact IC tag device 51 are cut by the above procedure, the lowest communicable power is arranged in the order of the IC chip 61, the IC chip 71, and the IC chip 81 and enclosed in parentheses. (Power: Large, Large, Large) → (Power: Large, Large, Small) → (Power: Small, Large, Small) → (Power: Small, Small, Small) → (Power: Small, Small, Large) → The state changes in the order of (power: large, small, large). At this time, in the above example, the combinations of “large” and “small” are all different for each cutting section, and the cutting section is used to determine which cutting section is used for communication by three IC tag circuits, that is, three IC chips. This can be determined by examining the lowest possible power.

(Fourth embodiment)
Next, a state change detection system that uses a non-contact IC tag device provided with a plurality of IC chips as in the third embodiment and also adjusts the resonance frequency in the capacitor will be described.

  FIG. 12 shows an equivalent circuit of a non-contact IC tag device having a resonance frequency adjusting capacitor as a capacitor. As shown in this figure, the non-contact IC tag device 91 has IC chips 101, 111, and 121, and these IC chips 101, 111, and 121 are connected to a resonance circuit including an antenna coil and a capacitor. The resonance circuit further includes a resonance frequency adjusting coil and a resonance frequency adjusting capacitor.

  That is, the IC chip 101 is formed by the antenna coil 102, the capacitor 103, the resonance frequency adjusting coil 104 (104-1 to 104-5), and the resonance frequency adjusting capacitor 105 (105-1 to 105-2). The IC chip 111 is connected to a resonance circuit, and includes an antenna coil 112, a capacitor 113, a resonance frequency adjusting coil 114 (114-1 to 114-5), and a resonance frequency adjusting capacitor 115 (115-1 to 115-2). The IC chip 121 includes an antenna coil 122, a capacitor 123, a resonance frequency adjusting coil 124 (124-1 to 124-5), and a resonance frequency adjusting capacitor 125 (125). -1 to 125-2).

  These antenna coil, capacitor, resonance frequency adjustment coil, resonance frequency adjustment capacitor and wiring portion are formed by directly patterning on an insulating sheet or an insulating substrate (not shown) by a known photolithography technique or printing technique. The other passive / active elements are electrically connected to these wiring portions and mounted on the insulating sheet. These wiring parts and mounting parts are covered with, for example, a synthetic resin film (not shown), and can be integrated by pressure heating.

  And this non-contact IC tag device 91 can be applied to a thing accompanied by a physical cutting work at the time of use of a medicine pack sheet etc. like a 1st embodiment, and cutting work is sequentially carried out by cutting parts 92-96. Thus, the resonance circuit is partially disconnected, and the resonance frequency adjusting coil is removed from the circuit. Further, by sequentially performing disconnection work by the cutting portions 97 to 98, the resonance circuit is partially disconnected and the resonance frequency adjusting capacitor is removed from the circuit. At this time, the resonance frequency adjusting coil and the resonance frequency adjusting capacitor to be removed by disconnection are disconnected in order from the outermost circuit that does not affect the other resonance frequency adjusting coil and the resonance frequency adjusting capacitor. It will be done.

  First, in the unused state, nothing is cut off as shown in FIG. 12, and the resonance circuits connected to the IC chips 61, 71, 81 exist in the state shown in FIG.

  Then, at the first use, the cutting portion 92 is cut. As a result, the resonance frequency adjusting coils 104-1, 114-1, and 124-1 are cut, respectively, and the inductance of the resonance circuit changes.

  Similarly, the cutting unit 93 cuts the resonance frequency adjusting coils 104-2, 114-2, and 124-2, and the cutting unit 94 cuts the resonance frequency adjusting coils 104-3, 114-3, and 124-3. The resonance frequency adjusting coils 104-4, 114-4, and 124-4 are cut by the section 95, and the resonance frequency adjusting coils 104-5, 114-5, and 124-5 are cut by cutting the cutting section 96, respectively. The frequency adjustment coil is removed from the resonance circuit, and when the specific resonance frequency adjustment coil is disconnected, an inductance change occurs such that the minimum communicable power or the maximum communication distance changes.

  In addition, the resonance frequency adjusting capacitors 105-1, 115-1 and 125-1 are cut by the cutting unit 97, and the resonance frequency adjusting capacitors 105-2, 115-2, and 125-2 are cut by the cutting unit 98. In each of the disconnecting sections, the resonance frequency adjusting capacitors are removed from the resonance circuit, and when the specific resonance frequency adjusting capacitor is disconnected, the change in capacitance such that the minimum communicable power or the maximum communication distance changes. It is supposed to happen.

  At this time, the inductance of the resonance frequency adjustment coil and the capacitance of the resonance frequency adjustment capacitor can be arbitrarily set, and the resonance frequency adjustment coil that is not involved in the change in the minimum communicable power or the maximum communication distance can be set there. Inductance is set to 0 without providing the coil itself, and similarly, a resonance frequency adjusting capacitor that is not involved in the change in the minimum communicable power or maximum communication distance may be set to 0 without providing the capacitor itself.

  By such an operation of cutting a part of the resonance circuit by the cutting unit, the minimum communicable power or the maximum communication distance of the resonance circuit changes compared to before the disconnection, and this is stored in the storage means connected to the reader / writer. Saved as history.

  Next, changes in the minimum communicable power and resonance frequency of each IC chip when this disconnection work is performed will be described.

  FIG. 13 shows the relationship between the state of use of the non-contact IC tag device 91 of FIG. 12 and the resonance frequency and minimum communicable power for each IC chip at that time. Here, when the cutting parts 92 to 96 are sequentially disconnected, and the resonance frequency adjustment coil is removed from the resonance circuit, the state changes sequentially from state 1 to state 6. The same state change from state 1 to state 6 is performed.

  In this embodiment, the resonance frequency adjusting capacitor can be removed from the resonance circuit by further disconnecting the cutting portions 97 and 98. When the cutting portion 97 is cut, the IC chip 121 is shown in the state 7. The minimum communicable power becomes low power by changing the resonance frequency of the IC chip to approximately 13.56 MHz, and the minimum communicable power of the IC chip is large power-low power-small in the order of the IC chips 101, 111, 121. It can be seen that the usage state has changed due to the combination of power.

  Next, when the cutting unit 97 is cut, as shown in the state 8, all the resonance frequencies of the IC chips 101, 111, and 121 are changed so that the lowest communicable power is also changed. It can be seen that the usage state has changed in the order of chips 101, 111, 121 in the order of small power-high power-high power. Changes in minimum communicable power and resonance frequency when these operations are performed are collectively shown in FIG.

  As described above, the IC tag having three IC chips has a combination of the minimum power at which the IC chip can be communicated by changing the minimum power at which the IC chip can be communicated at different cutting parts. It is possible to check the usage status by checking At this time, since the change in the resonance frequency is recorded in the IC chip, even if the combination of the lowest communicable power is used, the current state can be confirmed by referring to the change in the state so far.

  In the above description of the third and fourth embodiments, the combination of the lowest communicable power is not shown, but there are eight possible states shown in FIG. By checking against the history of changes, the usage state can be accurately identified even in the case of overlapping power combinations.

  In the third embodiment, only the resonance frequency adjusting coil is provided, and only the direction of increasing the resonance frequency is used. Therefore, even if the history of state change is recorded, the number of identifications is limited. By providing a resonance frequency adjusting capacitor as in this embodiment, the resonance frequency can be adjusted in a lower direction, and infinite number of states can be identified theoretically. Moreover, since the state change is recorded, it can be confirmed whether it is being used in order, and the use state can be grasped more accurately.

  Further, the resonance frequency adjusting coil and the resonance frequency adjusting capacitor of the contactless IC tag in the first to fourth embodiments described above are physically separated from the resonance circuit when the disconnection operation is performed. However, when a disconnection operation is performed, only the wiring is disconnected so as not to be physically separated, and a predetermined resonance frequency adjustment coil or resonance frequency adjustment capacitor is removed from the resonance circuit. You may comprise so that it can remove.

  Moreover, although the resonance circuit of the non-contact IC tag in the first to fourth embodiments described above has been described by an example in which the cut portion is cut by perforation, this is performed by, for example, pattern printing of wiring on a substrate. A circuit is formed as a printed wiring board, and the boards may be connected to each other by a connector at the cutting portion. In this case, first, the disconnection can be performed by removing the connector, and further the disconnection is performed. After that, it can be connected again. That is, it is possible to confirm not only the use state when disconnecting but also the use state when connecting.

  As described in the above embodiments, according to the state change detection system of the present invention, it is possible to accurately grasp the use state of the article by confirming the communication state of each IC chip.

The figure which showed the relationship between the change of the resonant frequency of an IC chip when communication power is set in two steps, and the lowest communicable power ratio. The figure which showed the relationship between the change of the resonant frequency of an IC chip when communication power is set to three steps, and the lowest communicable power ratio. The figure which showed the equivalent circuit of the non-contact IC tag apparatus used for this invention in 1st Embodiment. FIG. 4 is a perspective view showing a medicine package sheet to which the non-contact IC tag device of FIG. 3 is applied. The figure which showed the change of the resonant frequency and the minimum communicable electric power when disconnection is performed in 1st Embodiment. The figure which showed the equivalent circuit of the non-contact IC tag apparatus used for this invention in 2nd Embodiment. The figure which showed the equivalent circuit of the non-contact IC tag apparatus used for this invention in 3rd Embodiment. The figure which showed the change of the resonant frequency when the disconnection was performed in 3rd Embodiment, and the minimum electric power which can be communicated. The non-contact IC tag device of FIG. 7 is a diagram in which a resonance frequency adjusting coil having zero inductance is removed from the circuit and displayed. The figure which showed the change of the resonant frequency in the non-contact IC tag apparatus of FIG. The figure which showed the change of the communicable minimum electric power in the non-contact IC tag apparatus of FIG. The figure which showed the equivalent circuit of the non-contact IC tag apparatus used for this invention in 4th Embodiment. The figure which showed the change of the resonant frequency and the minimum communicable electric power when disconnecting in 4th Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Non-contact IC tag apparatus, 2, 3 ... Cutting | disconnection part, 11 ... IC chip, 12 ... Antenna coil, 13 ... Capacitor, 14-1, 14-2 ... Coil for resonance frequency adjustment, 21 ... Medicine-packaging sheet, 22 , 23 ... medicine package, 31 ... non-contact IC tag device, 32 to 35 ... cutting part, 41 ... IC chip, 42 ... antenna coil, 43 ... capacitor, 44-1, 44-2 ... coil for resonance frequency adjustment, 45 -1,45-2 ... Resonance frequency adjusting capacitors

Claims (9)

A non-contact IC tag device having an IC tag circuit composed of an IC chip connected to a resonance circuit composed of a capacitor and an antenna coil, and storage means for recording a state change of the non-contact IC tag device as a history. Do Ri, in the state change detection system that can be checked each time using a state change of an article for performing physical cutting operation,
Said resonant circuit are each made having a plurality of resonant frequency adjustment coil which is formed in parallel with respect to the resonant frequency adjustment capacitor及beauty before Symbol antenna coil formed in parallel to said capacitor,
The non-contact IC tag system, cuts the wiring of the resonance circuit can be removed some or all of the resonance frequency adjusting capacitor及beauty before Symbol resonance frequency adjustment coil by disconnection with the cutting operation of the article The state change detection system is characterized in that the resonance frequency of the resonance circuit is shifted when the wiring is disconnected by the cutting portion. A non-contact IC tag device having a plurality of IC tag circuits composed of an IC chip connected to a resonance circuit comprising a capacitor and an antenna coil, and a storage means for recording a state change of the non-contact IC tag device as a history , Tona is, in the state change detection system that can be checked each time using a state change of an article for performing physical cutting operation,
Said resonant circuit are each made having a plurality of resonance frequency adjusting coil formed in parallel to the resonant frequency adjustment capacitor及beauty before Symbol antenna coil formed in parallel to said capacitor,
Serial contactless IC tag device, the wiring of the plurality of resonant circuits from the resonant circuit part or all of the resonance frequency adjusting capacitor及beauty before Symbol resonance frequency adjustment coil by disconnection with the cutting operation of the article A state change detection system, comprising: a cutting portion that can be removed, wherein at least one resonance frequency of the plurality of resonance circuits is shifted when the wiring is disconnected by the cutting portion.   The resonance frequency is shifted from a lower frequency state than a carrier wave transmitted by a reader / writer that communicates with the non-contact IC tag device, to a frequency state close to the carrier wave, and further a higher frequency state than the carrier wave. Or shifting from a state having a frequency higher than the carrier to a state having a frequency close to the carrier, and further shifting to a state having a frequency higher than the carrier. State change detection system described. By the resonance frequency shifts, for one of the changed resonant circuit of the resonant frequency, claims, characterized in that changing the communicable minimum power or a maximum communication distance between the reader / writer before and after the disconnection 3 Symbol mounting state change detection system.   The state change detection system according to claim 4, wherein the change in the minimum communicable power or the maximum communication distance occurs in a cutting unit that is different for each IC tag circuit. 6. The state change detection system according to claim 4, wherein the minimum communicable power is obtained based on whether or not communication with a plurality of stages of communication power set in advance in the reader / writer is possible. The wiring of the cutting portion is connected to the connector, after removing by breaking a part of the formed formed in parallel the resonance frequency adjusting capacitor及beauty parallel the resonance frequency adjusting coils, The state change detection system according to claim 1 , wherein the state change detection system can be connected again to be part of the resonance circuit.   The state according to any one of claims 1 to 7, wherein the resonance frequency adjustment capacitor and the resonance frequency adjustment coil are physically separated from the resonance circuit when disconnected at the cutting portion. Change detection system.   8. The resonance frequency adjustment capacitor and the resonance frequency adjustment coil are integrated with the resonance circuit without being physically separated when disconnected at the cut portion. The state change detection system according to claim 1.

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