JP5231180B2 - Non-contact IC tag device - Google Patents

Description

  The present invention relates to a non-contact IC tag device that communicates information in a non-contact manner, and more particularly, to a non-contact IC tag device that can confirm a change in the state of an article to be physically cut every time it is used.

  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. An IC tag that detects 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 a non-contact IC capable of accurately grasping the use state of an article without using such a special element and accurately discriminating a plurality of use states. An object is to provide a tag device.

  In order to achieve the above object, a non-contact IC tag device of the present invention is a non-contact IC tag device having a plurality of IC tag circuits composed of IC chips connected to a resonance circuit composed of a capacitor and an antenna coil. The resonance circuit has one or more resonance frequency adjusting capacitors formed in parallel with the capacitors, and the non-contact IC tag device resonates by disconnecting the wires of the plurality of resonance circuits. A cutting part that can remove a part or all of the frequency adjusting capacitor from the resonance circuit is provided, and the wiring is disconnected by the cutting part, so that at least one resonance frequency of the plurality of resonance circuits is shifted to the high frequency side. It is characterized by doing.

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

  The contactless IC tag device of the present invention is characterized by having a plurality of such IC tag circuits, and further, the IC tag circuit has a plurality of resonances with respect to a capacitor of a resonance circuit connected to the IC chip. A frequency adjustment capacitor is connected in parallel, and this resonance frequency adjustment capacitor is used to set the resonance frequency to a predetermined value.

  The non-contact IC tag device of the present invention includes a part of the resonance frequency adjusting capacitor by disconnecting the 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). It has a cutting part that can be removed entirely. This cutting section may be configured such that a part or all of the resonance frequency adjustment capacitor is removed from one resonance circuit, and a part or all of the resonance frequency adjustment capacitor is removed from a plurality or all of the resonance circuits. You may be able to.

  By disconnecting the wiring by this cutting part, the resonance frequency adjusting capacitor is removed from the resonance circuit, and the resonance circuit whose capacitance is reduced shifts the resonance frequency to the high frequency side and reacts with the reader / writer. To change. Due to the change in the reaction, for example, the minimum communicable power or the maximum communication distance 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. it can. Here, it is assumed that the state has changed when the minimum communicable power or the maximum communication distance changes beyond a predetermined threshold due to the change in the resonance frequency by removing the resonance frequency adjustment capacitor.

  At this time, the resonance frequency shifts by removing the resonance frequency adjustment capacitor, and the minimum communicable power or the maximum communication distance changes based on this shift. Therefore, one or more resonance circuits adjust the resonance frequency adjustment capacitor. In this case, the resonance frequency is shifted to such an extent that only one of the resonance circuits can change the minimum communicable power or the maximum communication distance beyond a predetermined threshold, and the resonance frequency shift of the other resonance circuits is It is preferable not to change the minimum communicable power or the maximum communication distance (that is, below a predetermined threshold).

  This is because, if one change can be read among a plurality of resonance circuits included in the non-contact IC tag device, it is possible to read that the state has changed, and at the same time, the resonance frequencies of the two resonance circuits are set to a predetermined value. A large shift beyond the threshold value is due to the occurrence of overlapping state changes and a reduction in the number of state change identifications. In other words, it is preferable that the change in the minimum communicable power or the maximum communication distance occurs at different cutting portions for each IC tag circuit (that is, for each IC chip).

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

  As described above, the cutting part is a part of a plurality of resonance circuits, and in the present invention, a plurality of ICs are formed by disconnecting the wirings of the plurality of resonance circuits by the cutting part. This is an important component that makes it possible to determine the use state by changing the minimum communicable power or the maximum communication distance of at least one of the tag circuits (that is, 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 of 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 to communicate with low power by disconnecting at another disconnection part, and only communication with high power can be performed, so that the lowest communicable power is 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 a distance set appropriately for communication with the IC chip of each IC tag circuit of the non-contact IC tag device of the present invention, and indicates a range where communication with the reader / writer is possible. Is.

  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 of the present invention has a different minimum power or 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 to be configured so as to occur at the time of disconnection operation of the part. In this way, when the disconnection operation is performed a plurality of times, the disconnection is actually performed and the resonance frequency becomes the lowest communicable power or maximum There is only one IC chip that changes as the communication distance changes.

  That is, in one IC tag circuit, for example, as shown by a solid line in FIG. 1, when a capacitance change occurs, a resonance frequency is a high frequency because a large power is required such as a resonance frequency f1. Shifting to the side becomes f2, and communication is possible even with low power. When the capacitance further changes, the resonance frequency further shifts to the high 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.

  At this time, by using a plurality of IC tag circuits, 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 the 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 minimum communicable power or maximum communication distance, and three IC tag circuits (that is, three IC chips). When six IC chips are used, six usage states can be identified, and the number of usage state identifications can be further increased by increasing the number of IC tag circuits (that is, the number of IC chips used).

  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 capacity is changed due to disconnection, communication with medium power and low power is possible. Further, communication with low power is impossible due to disconnection, communication with medium power and high power is possible, and then disconnection is performed. 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. Increasing number of state change identifications with one IC chip . FIG. 2 shows the relationship between the lowest communicable power ratio and the resonance frequency at this time, and the frequency of the carrier wave 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 control unit of the non-contact IC tag device of 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 of the present invention does not require an element driven by a battery and 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 the information about whether or not it has been done.

  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.

  In the present invention, the antenna coils in the plurality of resonance circuits may all be wound in the same direction, or the winding directions of one or more antenna coils may be reversed to suppress mutual interference. Good. 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 capacitor of the present invention is configured such that an arbitrary capacitor is cut in advance, and when the cut portion is disconnected, the resonance frequency adjustment capacitor is connected to a plurality of IC chips. The resonance frequency of at least one resonance circuit is provided to change. At this time, it is preferable that the resonance circuit in which the minimum communicable power or the maximum communication distance changes when the disconnection is disconnected is one IC chip for each disconnection.

  The capacitor and the resonance frequency adjusting capacitor are not particularly limited, and a known capacitor may be formed, and a variable capacitor may be used here. In the case of using a variable capacitor, after manufacturing a non-contact IC tag device, it is set to an arbitrary capacitance, and it is arbitrarily set which resonance circuit's resonance frequency is changed when it is disconnected at which cutting portion. It is preferable in that it can be set and 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 non-contact IC tag device 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, if the memory is configured to store the state change time and the like, the use state of the article can be grasped more accurately.

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

(First embodiment)
FIG. 3 shows an equivalent circuit of the non-contact IC tag device of the present invention, and FIG. 4 is a perspective view of the non-contact IC tag device of FIG. FIG. 5 is a perspective view when the IC chip of FIG. 4 is applied to the medicine package sheet.

  As shown in FIGS. 3 and 4, the non-contact IC tag device 1 has three IC chips, an IC chip 11, an IC chip 21, and an IC chip 31, which are an antenna coil, a capacitor, and a capacitor, respectively. Are connected to a resonance circuit comprising a resonance frequency adjusting capacitor 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 capacitor 14 (14-1 to 14-5), and the IC chip 21 is connected to the antenna coil 22. The IC chip 31 is connected to a resonance circuit formed by a capacitor 23 and a resonance frequency adjusting capacitor 24 (24-1 to 24-5). The IC chip 31 includes an antenna coil 32, a capacitor 33, and a resonance frequency adjusting capacitor 34 (34). -1 to 34-5).

  These antenna coil, capacitor, resonance frequency adjusting capacitor and wiring part can be formed by directly patterning on an insulating sheet or insulating substrate (not shown) by a 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 cut portions 2 to 6, and by disconnecting the cut portions, part of the three resonance circuits is disconnected to remove the resonance frequency adjusting capacitor from the circuit. Be able to.

  FIG. 5 shows an application of the non-contact IC tag device 1 shown in FIG. 3 to a medicine package sheet. The non-contact IC tag device 1 is configured to be enclosed in a medicine package sheet 41. . This medicine pack sheet 41 has a perforation or the like formed at a part corresponding to the cutting part, and is easy to cut, and the medicine packs 42 to 46 for one use are fixed to the part to be cut. . When using medicine, along this perforation (corresponding to the cutting part), by cutting off a single medicine package from the sheet, the resonance circuit is partially disconnected and the capacitor is removed from the circuit. ing. At this time, the resonance frequency adjusting capacitors to be removed by disconnection are sequentially disconnected from those formed on the outermost side of the circuit that does not affect other resonance frequency adjusting capacitors.

  First, in the unused state, as shown in FIG. 5, the medicine package sheet 41 is not cut off and the resonance circuits connected to the IC chips 11, 21, 31 are shown in FIGS. 3 and 4. It exists in the state shown in.

  Then, at the first use, the cutting part 2 is cut to use the medicine package 42. As a result, the resonance frequency adjusting capacitors 14-1, 24-1, 34-1 are disconnected, and the resonance circuit A change in capacitance occurs.

  Similarly, when using the medicine package 43, the capacitors 14-2, 24-2, and 34-2 are used by the cutting section 3, and when using the medicine package 44, the capacitors 14-3 and 24- 3, 34-3 uses the medicine package 45 when the capacitor 14-4, 24-4, 34-4 is used by the cutting part 5, and when using the medicine package 46, the cutting part 6 cuts the capacitor 14- 5, 24-5 and 34-5 are disconnected, and the capacitors are removed from the resonance circuit. When the specific resonance frequency adjustment capacitor is disconnected, the minimum communicable power or the maximum communication distance changes. The capacity change of is going to happen. At this time, the capacitance of the resonance frequency adjusting capacitor can be set as appropriate, and the capacitor that is not involved in the change in the minimum communicable power or the maximum communication distance may have a capacitance of zero.

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

  The communication power of the reader / writer and the setting of the communication distance with the non-contact IC tag device may be appropriately selected depending on the communication conditions. In the embodiment of the present specification, for example, two types, 100 mW and 10 mW, large and small It is assumed that the communication distance between the reader / writer and the non-contact IC tag device is set to 27 mm.

  FIG. 6 shows the relationship between the usage state of the medicine package sheet of FIG. 5 and the resonance frequency and the lowest communicable power for each IC chip at that time.

  First, the unused medicine package sheet is in the state shown in FIG. 5, and the resonance frequency at this time is as shown in state 1 of the IC chip 11, the IC chip 21, and the IC chip 31. All resonance frequencies are lower than 13.56 MHz (L), and the lowest communicable power is all high power, that is, high power-high power-high power.

  When the cutting unit 2 is cut at the first use, only the resonance frequency of the IC chip 31 is changed to about 13.56 MHz (M) as shown in the state 2, so that the minimum communicable power is small. As a result, the minimum communicable power of the IC chip becomes a combination of high power-high power-low power in the order of the IC chips 11, 21, 31, and it can be seen that the usage state has changed.

  Next, when the cutting unit 3 is cut, only the resonance frequency of the IC chip 11 is changed to about 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 11, 21, 31, and the usage state has changed.

  Further, when the cutting unit 4 is cut, only the resonance frequency of the IC chip 21 is changed to about 13.56 MHz as shown in the state 4, so that the minimum 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 5 is cut, only the resonance frequency of the IC chip 31 is changed as shown in the state 5 and becomes a state (H) higher 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 lowest communicable power of the IC chip is a combination of low power-low power-high power in the order of the IC chips 11, 21, 31, and the usage state has changed.

  Finally, when the cutting unit 6 is cut, only the resonance frequency of the IC chip 11 is changed as shown in the state 6 so as to be larger 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 high power-low power-high power in the order of the IC chips 11, 21, 31, and the use state has changed.

  Changes in minimum communicable power and resonance frequency when the above operation is performed are collectively shown in FIG.

  As described above, the non-contact IC tag device having three IC chips changes the minimum communicable power of each IC chip in different cutting parts, thereby determining which cutting part is cut at the lowest possible communication of the IC chip. It can be seen by looking at the combination of power, and the usage status can be confirmed. At this time, if the change of the resonance frequency is recorded on the IC chip, it can be confirmed whether the resonance frequency is used in order, and the use state can be more accurately confirmed.

  More specifically, in the first embodiment, the non-contact of the present invention using the IC tag circuit simplified by using the resonance circuit excluding the resonance frequency adjusting capacitor not involved in the change of the maximum communicable power. The operation of the IC tag device is as follows.

  FIG. 7 shows a case where the cutting unit 2, the cutting unit 3, the cutting unit 4, the cutting unit 5 and the cutting unit 6 are disconnected in the resonance frequency adjusting capacitor of the non-contact IC tag device 1 shown in FIG. It is the figure which displayed by removing the capacitance of the capacitor for frequency adjustment which is not concerned with the change of possible maximum electric power from 0, and from a circuit. In this figure, 14-2, 14-5, 24-3, 34-1 and 34-4 remain as the resonance frequency adjustment capacitors, and other resonance frequency adjustment capacitors are removed.

  7, when cutting the cutting part 2, the resonance frequency adjusting capacitor 34-1 is disconnected and disconnected. When the cutting part 3 is disconnected, the resonance frequency adjusting capacitor 14-2 is disconnected and disconnected, and the cutting part 4 is cut. Then, the resonance frequency adjusting capacitor 24-3 is disconnected and disconnected. When the cutting portion 5 is disconnected, the resonance frequency adjusting capacitor 34-4 is disconnected and disconnected. When the cutting portion 6 is disconnected, the resonance frequency adjusting capacitor 14- 5 is disconnected and the end is made.

  FIG. 8 shows that when the cutting parts 2 to 6 of the non-contact IC tag device 1 are cut by the above procedure, the frequency adjusting capacitors are disconnected and cut off in the above order, and the IC tag circuits 19 to 39 (i.e., IC It is the figure which showed how the resonance frequency of each resonance circuit of chip | tips 11-31 changes. When the cutting parts 2 to 6 are cut in order, the resonance frequency of the IC chip 11 changes as (L → L → M → M → M → H), and the resonance frequency of the IC chip 21 changes (L → L → L → M). → M → M), and the resonance frequency of the IC chip 31 changes as (L → M → M → M → H → H). 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. 9 is a diagram showing how the minimum communicable power of each of the IC chips 11 to 31 changes according to the change of the resonance frequency. That is, when the cutting units 2 to 6 of the non-contact IC tag device 1 are cut according to the above procedure, the lowest communicable power of the IC chip 11 is (power: large → large → small → small → small → large). The minimum communicable power of the chip 21 changes (power: large → large → large → small → small → small), and the minimum communicable power of the IC chip 31 changes (power: large → small → small → small → large → large). To do. When the results of FIG. 8 and FIG. 9 are summarized, the same result as the table of FIG. 6 is obtained.

  Here, the minimum communicable power when the cutting units 2 to 6 of the non-contact IC tag device 1 are cut according to the above procedure is described in the order of the IC chip 11, the IC chip 21, and the IC chip 31 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.

(Second Embodiment)
FIG. 10 shows the non-contact IC tag device of the present invention by an equivalent circuit. As shown in this figure, 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, and these IC chips respectively correspond to an antenna coil, a capacitor and a capacitor. Are connected to a resonance circuit comprising resonance frequency adjusting capacitors formed in parallel.

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

  The non-contact IC tag device 51 is formed with cutting portions 52 to 56. By disconnecting the cutting portions, a part of the three resonance circuits can be disconnected to remove the capacitor from the circuit. It has become.

  In this embodiment, the capacitor is physically integrated with the resonance circuit when the cut portion is disconnected and disconnected, and in the first embodiment, the capacitor is physically separated from the resonance circuit when disconnected. In contrast to being cut.

  In the case of the IC tag device as in the second embodiment, it is possible to easily provide the cutting portion close to the IC tag device. For example, a portion to be cut is smaller than the ticket main body, such as a ticket. It can be applied to the case where the end of the ticket is cut a plurality of times.

  When this end portion is cut by the cutting portion, the resonance frequency of each IC chip changes as in the first embodiment, and it can be easily confirmed which cutting portion is cut by the combination.

(Third embodiment)
Next, FIG. 11 shows an application example of the non-contact IC tag device of the present invention. As shown in this figure, the non-contact IC tag device 101 has three IC chips, an IC chip 111, an IC chip 121, and an IC chip 131. These IC chips are antenna coils 112, 122, 132, respectively. Connected to a resonance circuit composed of capacitors 113, 123, 133 and resonance frequency adjusting capacitors 114 (114-1 to 114-5), 124 (124-1 to 124-5), 134 (134-1 to 134-5) Thus, a circuit having the same configuration as the equivalent circuit shown in FIG. 3 is formed.

  This resonant circuit is formed as a printed wiring board in which wiring is pattern-printed on the substrate. In the cutting portions 102 to 106, the substrates are connected by a connector, and the cutting portion 102 in FIG. As shown, disconnection can be performed by first removing the connectors 102a to 102c. This is because the wiring is similarly connected by three connectors in the cut portions 103 to 106 so that they can be disconnected.

  That is, in this embodiment, the non-contact IC tag device itself takes the same form as that of the first embodiment, but the wiring is formed on the substrate. At this time, the first embodiment In the present embodiment, the cut portion is provided in the medicine package sheet by perforation, except that the wiring board is connected by a connector.

  When the cutting part is thus connected by the connector, it can be connected again after being cut and disconnected. That is, it is possible to confirm not only the use state when disconnecting but also the use state when connecting.

  Thus, by confirming the communication state of each IC tag circuit of the non-contact IC tag device, that is, each IC chip, it is possible to accurately grasp the use state of the article.

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 of this invention in 1st Embodiment. The perspective view which showed the non-contact IC tag apparatus of FIG. 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. FIG. 4 is a diagram in which the resonance frequency adjusting capacitor having a capacitance of 0 is removed from the circuit and displayed in the non-contact IC tag device of FIG. 3. 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 of this invention in 2nd Embodiment. The figure which showed the non-contact IC tag apparatus of this invention in 3rd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Non-contact IC tag apparatus, 2-6 ... Cutting part, 11, 21, 31 ... IC chip, 12, 22, 32 ... Antenna coil, 13, 23, 33 ... Capacitor, 14, 24, 34 ... Resonance frequency adjustment Capacitor, 19, 29, 39 ... IC tag circuit, 41 ... medicine package sheet, 42-46 ... medicine package, 101 ... non-contact IC tag device, 102-106 ... cutting part, 102a-102c ... connector, 111, 121 131, IC, 112, 122, 123 ... Antenna coil, 113, 123, 133 ... Capacitor, 114, 124, 134 ... Resonance frequency adjusting capacitor

Claims (11)

Non capable of confirming the IC tag circuit including an IC chip which is connected to the resonant circuit consisting of a capacitor and an antenna coil plurality Yes, each time using a state change of an article for performing physical cutting operations A contact IC tag device,
The resonance circuit includes one or more resonance frequency adjusting capacitors formed in parallel with the capacitor,
The non-contact IC tag device has a cutting section that can disconnect a part of or all of the resonance frequency adjusting capacitors from the resonance circuit by disconnecting the wirings of the plurality of resonance circuits along with the cutting operation of the article. The contactless IC tag device characterized in that at least one resonance frequency of the plurality of resonance circuits is shifted to a high frequency side when the wiring is disconnected by the cutting portion.   The resonance frequency of the resonance circuit is a frequency close to the carrier wave from a state where the resonance frequency of the resonance circuit is lower than the carrier wave of the communication signal transmitted by the reader / writer that communicates with the non-contact IC tag device due to the disconnection of the wiring by the cutting unit. The non-contact IC tag device according to claim 1, wherein the non-contact IC tag device is shifted to the state.   The resonance frequency of the resonance circuit is higher than the carrier wave from a state close to the carrier wave of the communication signal transmitted by the reader / writer that communicates with the non-contact IC tag device due to the disconnection of the wiring by the cutting unit. The non-contact IC tag device according to claim 1, wherein the non-contact IC tag device is shifted to the state.   The resonance frequency of the resonance circuit is a frequency close to the carrier wave from a state where the resonance frequency of the resonance circuit is lower than the carrier wave of the communication signal transmitted by the reader / writer that communicates with the non-contact IC tag device due to the disconnection of the wiring by the cutting unit. 2. The non-contact IC tag device according to claim 1, wherein the non-contact IC tag device shifts to a state of a frequency higher than that of the carrier wave through the state of (1).   The minimum power or the maximum communication distance communicable with the reader / writer before and after the disconnection is changed for one of the resonance circuits whose resonance frequency is changed by shifting the resonance frequency. The non-contact IC tag device according to any one of 1 to 4.   6. The non-contact IC tag device according to claim 5, wherein the change in the minimum communicable power or the maximum communication distance occurs at a cutting portion that is different for each IC tag circuit.   The wiring of the cut portion is connected by a connector, and after removing a part of the resonance frequency adjusting capacitor formed in parallel, it is possible to make a part of the resonance circuit by connecting it again. The non-contact IC tag device according to claim 1, wherein the non-contact IC tag device is provided.   The contactless IC tag according to claim 5, 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 a reader / writer is possible. apparatus.   9. The contactless IC tag device according to claim 1, wherein the resonance frequency adjusting capacitor is a variable capacitor.   10. The non-contact IC tag device according to claim 1, wherein the resonance frequency adjusting capacitor is physically separated from the resonance circuit when disconnected at the cut portion. 11.   10. The non-contact method according to claim 1, wherein the resonance frequency adjusting capacitor is integrated with the resonance circuit without being physically separated when disconnected at the cut portion. 11. IC tag device.

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