JP2007066110A - Resonance tag with storage type sensor and method for securing environment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resonance tag with a storage type sensor and a method for securing environments, with which the normal holding of an external environment is secured even when the resonance tag is exposed to an environment around which there is no reader and the resonance tag can be reused. <P>SOLUTION: The resonance tag with the storage type sensor includes a resonance circuit 1 including an antenna (2) and a capacitor (3), the resonance circuit 1 includes an added circuit including at least one inductor or capacitor as a circuit element (5), and the added circuit comprises a switch element 4 consisting of the storage type sensor whose state is changed in accordance with changes in external environments. Since a resonance frequency is changed when a capacitance component or an inductance component in the resonance circuit 1 is changed, environments can be surely secured by measuring changes in the resonance frequency. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a resonance tag with a memory-type sensor capable of reading information in a non-contact manner and an environmental security method using the resonance tag with a memory-type sensor. The present invention relates to a resonance tag with a memory type sensor detected by the method and an environmental security method using the same.

  Conventionally, as an environmental security method for storage of luggage, etc., a resonant tag with a sensor is attached to the luggage, and an environmental change of the stored luggage is detected by a sensor, and the storage environment is within a preset allowable range. A method of confirming that there has been proposed has been proposed.

As such a resonance tag with a sensor, a resonance circuit in which a ferroelectric capacitor having a large temperature dependency is incorporated as a capacitive element is configured, and the resonance circuit changes due to the temperature dependency of the capacitance of the ferroelectric capacitor. The temperature is measured by detecting the resonance frequency of the liquid (for example, see Patent Document 1), or the LC resonance tag is attached to a urine absorption pad or the like, and the urine absorption pad or the like absorbs excrement and changes in resonance. A device that measures humidity by detecting the resonance frequency of a circuit (for example, see Patent Document 2) is known.
Japanese Patent Laid-Open No. 10-227702 JP 2000-258254 A

  However, since such a conventional resonant tag with a sensor had to be used in combination with a reader such as a dip meter that always measures the resonance frequency, for example, an environment where there is no reader around due to, for example, transshipment of luggage In other words, there was a drawback that it was not possible to guarantee that the external environment was maintained normally.

  Therefore, the present invention has been made to solve the above problems while maintaining the advantage of the resonance tag that does not use a battery, and the environment is guaranteed to ensure the environment at the time of logistics or storage of luggage. An object of the present invention is to provide a resonance tag with a storage sensor and an environment security method having a function of storing the state when the range is exceeded.

  In order to achieve the above object, a resonance tag with a memory type sensor according to the present invention is a resonance tag including a resonance circuit including an antenna, and the resonance circuit includes at least one inductor or capacitor as a circuit element. The additional circuit includes a switch element including a memory sensor that changes its state according to a change in the external environment.

  In this specification, “resonance tag”, “sensor state”, and “start of environmental security” mean the following or the following respectively.

  A “resonance tag” has a resonance circuit including at least an inductor and a capacitor serving as an antenna for transmission and reception, and specifies a resonance frequency determined based on a capacitance component and an inductance component of the resonance circuit in a contactless manner via the antenna. A tag configured to be able to do so.

  The “sensor state” refers to the mechanical state of the memory sensor, and the change means that the sensor state mechanically changes when a predetermined guaranteed range is exceeded from the initial state. . This mechanical change can be easily determined by measuring the resonance frequency of the resonance circuit as a result because the capacitance component or inductance component of the resonance circuit changes due to the mechanical change.

  “Starting environmental protection” means that the resonance tag is operated from the initial state of the memory type sensor, or that the reset signal is supplied to the resonance tag and the memory type sensor is set to the initial state.

  A resonance circuit used for a resonance tag with a memory-type sensor according to the present invention has a resonance circuit including an inductor and a capacitor serving as an antenna for transmission and reception. The resonance circuit further includes at least one inductor or capacitor as a circuit element. An additional circuit is provided. In this additional circuit, a memory type sensor to be described below is incorporated as a switch element. When this memory type sensor is activated and a part of the additional circuit is connected or disconnected or short-circuited, A circuit element is added to or removed from the resonant circuit. That is, this additional circuit functions as a resonance frequency changing means that can change the resonance frequency of the resonance circuit by changing its inductance or capacitance.

  By adding or removing circuit elements in this way, the capacitance component or inductance component of the resonance circuit changes, and accordingly, the resonance frequency of the resonance tag also changes before and after the operation of the sensor. Therefore, if the resonance frequency is read by a reading device such as a dip meter and compared with the resonance frequency when the memory type sensor is in the initial state, it can be easily determined whether or not the sensor is activated.

  Next, the switch element used in the resonance tag with a memory type sensor according to the present invention is composed of a memory type sensor whose state changes according to a change in the external environment, and a circuit that utilizes the mechanical change of the memory type sensor. Is connected / disconnected.

  Since this memory-type sensor stores and detects that it has been exposed to a predetermined environmental condition, once it has been exposed to a predetermined environmental condition, it will be detected even if the environment returns to the normal range. Maintains the changed state and does not return to its original state, and continues to hold the presence or absence of an environmental change. Therefore, when the switch is on in the initial state, it is off, and when it is off, it is on and the state is maintained.

  Examples of the memory sensor include a temperature sensor, a humidity sensor, an acceleration sensor, and an optical sensor, and these are used as one type or a combination of two or more types.

  Further, this memory type sensor has a sensor reset means, and it is preferable that the state in which the state of the sensor is mechanically changed can be returned to the original initial state, whereby the resonance with the memory type sensor of the present invention is achieved. Tags can be used again even after they have been used once.

  Furthermore, the resonance tag with a memory type sensor of the present invention preferably has a reset signal input means when the memory type sensor has a sensor reset means. The sensor reset means is operated based on the reset signal. This reset signal input means can be made to directly contact the sensor reset means of the resonance tag to give a reset signal, or by providing a coiled antenna for receiving the reset signal by electromagnetic induction. It is also possible to give the reset signal in a non-contact manner.

  The resonance tag with a memory type sensor according to the present invention has a configuration in which an antenna is formed on the main surface of a dielectric, and an electrode plate made of a conductor is formed on the opposite side of the dielectric to form a capacitor. Generally, it is a resonant circuit. This resonance tag is formed into any shape according to the shape of the luggage, such as a card shape, a tape shape, a button shape, a coin shape, etc. A string or an adhesive layer for mounting on the luggage as required Etc. are provided. At this time, the antenna is preferably coiled.

  As described above, according to the resonance tag with a memory type sensor of the present invention, once it is exposed outside the environmental security range, the state of the memory type sensor changes and the change is stored. When this resonance tag with a memory-type sensor is attached to a luggage or the like, it is possible to reliably ensure environmental conditions during transportation or storage of the luggage.

  If this resonant tag with memory type sensor is equipped with a sensor reset means, the resonant tag with memory type sensor is recovered after use, confirmed the function of the tag, etc., then attached to a new baggage again. It can be reused by setting the sensor to the initial state. As a result, the environmental security cost per time can be reduced, and the environmental load can be reduced because the cost is not discarded each time.

  Further, when the measurement of the resonance frequency and the reception of the reset signal are performed via the antenna, the resonance frequency can be read out from the resonance tag with a memory sensor without contact, and the sensor can also be reset. Therefore, environmental protection can be performed without hindering the transportation or storage process.

  The resonance tag with a memory type sensor according to the present invention may be a resonance tag integrally including a plurality of resonance circuits including an antenna. For example, the switching element including a memory type sensor due to a change in the external environment described above may be used. In addition to the resonance circuit having, a switch element made of a memory sensor is not included, and at least one other resonance circuit including a predetermined inductor or capacitor as a circuit element may be provided. Here, the other resonance circuit has a specific resonance frequency, and can be used for applications such as identification of an ID code that enables identification of a specific package before and after transportation. In this case, as a matter of course, the resonance frequency of the resonance circuit for environmental protection (including both before and after the change of the memory sensor) and the resonance frequency of the other resonance circuit do not overlap. Each must be able to be detected in a sufficiently identifiable state.

  Next, the environmental security method of the present invention is an environmental security method for guaranteeing the environment during transportation or storage of a package equipped with the resonance tag with a memory type sensor of the present invention, and is stored at the start of transportation or storage. Resonance frequency recording process for reading and recording the resonance frequency via the antenna of the resonance tag with sensor, and at the end of transportation or storage, reading the resonance frequency via the antenna of the resonance tag with memory sensor and transporting this resonance frequency Or a resonance frequency comparison step for comparing with a resonance frequency recorded at the start of storage.

  In addition, this environmental protection method may perform a sensor reset step of inputting a reset signal and initializing a memory type sensor provided in a resonance tag with a memory type sensor before the resonance frequency storing step.

  A specific method for transmitting / reading a signal via an antenna is realized by passing a package having a resonance tag with a storage sensor attached to a gate provided with the antenna. This gate is used to measure the resonance frequency at the start point of a conveyor or vehicle path for carrying a load, or to send a reset signal to the gate for measuring the resonance frequency at the end point in the case of cargo transportation. Each gate is installed.

  In the case of storage, when the entrance and exit of a storage warehouse etc. are different, a gate for measuring the resonance frequency or transmitting a reset signal is installed at the entrance, and a gate for measuring the resonance frequency is installed at the exit. However, when the entrance and the exit are common, the resonance frequency is measured and the reset signal is transmitted by the common gate.

  Another way to bring the antenna closer is to measure the resonance frequency by bringing the reader close to the individual baggage when receiving the load, giving a reset signal, and measuring the resonance frequency by bringing the reader closer to the baggage when delivering the baggage. May be.

  According to the environmental security method of the present invention, once exposed to outside the environmental security range, the state of the memory type sensor changes and the change is stored. When it is attached to a luggage, it is possible to ensure the environmental conditions during the transportation or storage of the luggage.

  Also, when performing the sensor reset process, the resonant tag with a memory type sensor is collected after use, and after confirming the tag's function, etc., it is attached again to a new package and supplied again with a reset signal for reuse. can do. As a result, the environmental security cost per time can be reduced, and the environmental load can be reduced because the cost is not discarded each time.

  Further, the resonance frequency of the resonance tag with a memory type sensor can be measured in a non-contact manner, and environmental protection can be performed without hindering the transportation or storage process.

  According to the resonance tag with a memory type sensor and the environmental security method of the present invention, it is possible to reliably ensure the environmental conditions during transportation or storage of the luggage, and it is possible to reuse the resonance tag.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a conceptual diagram showing a configuration of a resonance tag with a memory type sensor according to this embodiment.

  The resonance circuit 1 of the resonance tag with memory type sensor according to this embodiment includes an antenna coil 2, a resonance frequency setting capacitor 3, a switch 4 comprising a memory type temperature sensor, and a resonance frequency changing capacitor 5. It is.

  The resonant circuit 1 is directly patterned on a dielectric material (not shown) except for the switch 4 by a known photolithography technique or printing technique, and the memory type sensor is electrically connected to these wiring portions to be insulated. It is mounted on the board.

  As the memory-type temperature sensor used here, for example, as shown in FIG. 2, a temperature sensor configured using bimetal can be used. The operation of the memory type sensor using this bimetal will be described with reference to FIGS.

  The memory type sensor 10 includes, for example, two metal plates of silicon and aluminum having different linear expansion coefficients, and a bimetal 11 having electrical contacts 11a and 11b, and an electrical contact disposed with the bimetal 11 interposed therebetween. Two plate springs 12 and 13 having 12a and 13a, and a cantilever plate 14 having a claw at the tip and made of a ceramic piezoelectric element having a bimorph structure.

  First, FIG. 2A shows the initial state of the sensor. At the start of environmental security, this sensor is in an initial state, and the bimetal 11 and the leaf spring 12 can be conducted through the contacts 11a and 12a. In this state, the switch is off and the parallel circuit is connected. Not.

  Next, FIG. 2B shows a high temperature storage state. Since the bimetal 11 has a property of bending to the right side (the leaf spring 13 side) as the temperature rises, the bimetal 11 is engaged with the claws of the plate 14 having the claws when the temperature exceeds a predetermined temperature, and then the temperature decreases. However, the bimetal 11 will not return to its original state. In addition, when the bimetal 11 is in a high temperature storage state, the bimetal 11 can now conduct through the leaf spring 13 and the contacts 11b and 13a, and the switch is turned on in this state. Then, it is confirmed that the parallel circuit is connected and the resonance frequency is changed by exceeding the capacitance component or the inductance component of the resonance circuit and the predetermined temperature is exceeded.

  FIG. 2C shows a reset operation for returning the memory type sensor once in the temperature memory state to the initial state. The cantilever plate 14 is made of a ceramic piezoelectric element having a bimorph structure. By applying a predetermined voltage to the cantilever plate 14, the cantilever plate 14 warps upward, so that the bimetal 11 is detached from the claw. Returning to the initial state of FIG. 2A, it can be used again for environmental protection. Even after the resonance tag of the present invention is used once, it can be used semipermanently by repeating this operation.

  As the memory-type temperature sensor, a memory-type temperature sensor using a temperature-sensitive magnetic material as shown in FIG. 3 can be used. The operation of the memory type temperature sensor using this temperature-sensitive magnetic material will be described with reference to FIGS.

  This memory-type temperature sensor 20 has a cantilever-like spring 22 having a magnet 21 at the tip, electrical contacts 22a and 22b at intermediate positions, and a feeling that the magnet of the cantilever-like spring 22 is sandwiched therebetween. The thermomagnet 23 and the electromagnet 24, the two leaf springs 25 and 26 having electrical contacts 25 a and 26 a arranged with the cantilever spring 22 interposed therebetween, and the electric terminal 27 of the electromagnet 24 are configured.

  First, FIG. 3A is a diagram showing a state of sensor manufacturing and high temperature storage. Here, the magnet 21 and the electromagnet 24 form a magnetic path and are stably fixed.

  Therefore, when it is used as a resonance tag, it must first be in an initial state. As shown in FIG. 3B, when electric power is supplied to the electric terminal 27 of the electromagnet 24 and energized, the electromagnet 24 and the magnet A repulsive force is generated between the magnet 21 and the magnet 21, and the magnet 21 moves to the temperature-sensitive magnetic body 23 side. At this time, a magnetic path is formed between the magnet and the temperature-sensitive magnetic material side, and the magnet 21 is attracted and fixed to the temperature-sensitive magnetic material 23 side. This is a sensor reset operation.

  Next, FIG.3 (c) is the figure which showed the initial state of the sensor. At the start of measurement, a sensor reset operation is performed as shown in FIG. 3B, the sensor is in an initial state, and the cantilever spring 22 and the leaf spring 25 can be energized via the contacts 22a and 25a. However, in this state, the contacts 22b and 26b are separated from each other, the switch is turned off, and the parallel circuit is not connected.

  When the sensor 20 that takes the initial state senses that the Curie temperature of the temperature-sensitive magnetic body 23 has been exceeded due to an increase in temperature, the saturation magnetic flux density of the temperature-sensitive magnetic body decreases, so This disappears, the magnetic path is lost, and the magnet 21 is opened. The opened magnet 21 is moved to the electromagnet 24 side by the force of a cantilever spring, and is fixed by forming a magnetic path with the electromagnet 24 (FIG. 3A).

  When exposed to such a high temperature, the cantilever spring 22 and the leaf spring 26 can be energized via the contacts 22b and 26a, thereby turning on the switch and connecting or short-circuiting the additional circuit. Along with this, it is confirmed that the resonance frequency is changed by exceeding the capacitance component or the inductance component of the resonance circuit and exceeds a predetermined temperature.

  In order to return this to the initial state again, the resonance tag can be reused by energizing the electromagnet as shown in FIG. 3 (b). By repeating this, the resonance tag of the present invention is semi-permanent. Can be used.

  This memory type sensor using temperature-sensitive magnetic material is stable compared to the memory type sensor using bimetal, because there is no mechanism that generates friction like a mechanical locking claw. High accuracy can be achieved because it uses a physical phenomenon of a small operating width called temperature.

  Furthermore, since a bimetal or a heating element is not used and a reset function by an electromagnet is realized, the manufacturing is easy and the structure is suitable for downsizing. In particular, since all the components have a layer configuration by stacking planes, they can be manufactured by a manufacturing technique using lithography.

Examples of the temperature-sensitive magnetic material include a magnetic material sintered with an oxide (Fe ₂ O ₃ , MnO, ZnO, etc.) such as iron, manganese, zinc, etc. as a main component. Thus, the Curie temperature can be controlled. In addition, the operating temperature can be set in the range of -30 to 130 ° C, and the accuracy can be adjusted to react in the range of ± 1 ° C, so that the luggage is exposed to the environment above the predetermined temperature. It can be detected with high sensitivity.

  Next, the operation of the resonance tag with a memory type sensor according to this embodiment will be described with reference to FIG.

  When this resonance tag 1 with a memory type sensor is used for the first time, the switch 4 comprising the memory type sensor is in an initial state, and the switch is off. Therefore, only the resonance frequency setting capacitor 3 affects the resonance frequency of the resonance circuit. The resonance frequency of the resonance circuit 1 at this time becomes a predetermined frequency based on the inductance component of the antenna coil 2 and the capacitance component of the resonance frequency setting capacitor 3, and this resonance frequency is measured at the start of environmental security.

  The resonance frequency is measured using a reader. This reader includes an oscillator capable of sweeping the frequency, an antenna coil that transmits an output from the oscillator to the resonance tag, and receives a reflected wave from the resonance tag, and a resonance. The resonance intensity measuring circuit measures the reflected wave received from the tag. The resonance frequency of the resonance circuit can be easily measured since the resonance intensity becomes the highest when the oscillation frequency in the reading device matches the resonance frequency of the resonance tag (for example, JP 2000-49655 A). reference).

  When this resonance tag is exposed outside the range of environmental security such as a predetermined temperature or higher, for example, the switch 4 is turned on and the resonance frequency changing capacitor 5 is added to the resonance circuit 1. This contributes to the determination of the resonance frequency, and the capacitance of the capacitor changes as a whole of the resonance circuit, and the resonance frequency also changes accordingly. Therefore, if the environmental security range is once deviated from the start to the end of the environmental security, the resonance frequency at the start and the end will be different. Can be determined.

  Next, an environmental security method for transportation using the resonance tag with a memory type sensor of the present invention will be described with reference to FIG.

  FIG. 4A is a diagram showing an outline of an environmental protection method in transportation using the resonance tag 100 with a memory type sensor. FIG. 4B is a diagram showing a configuration example of the resonance tag 100 with a memory type sensor used in this example. Here, the resonance tag with memory type sensor 100 includes an ID code identifying resonance circuit 110 and a resonance circuit with memory type sensor 120 as separate resonance circuits, and includes two resonance circuits in one tag. The configuration is such that both the resonance frequency for identifying the ID code and the resonance frequency indicating the state of the memory type sensor can be reliably detected. The ID identifying resonance circuit 110 includes an antenna coil 111 and a capacitor 112. The memory-type sensor-equipped resonance circuit 120 includes an antenna coil 121, a capacitor 122, a resonance frequency changing capacitor 123, and a memory. The switch 124 is composed of a mold sensor, and these are integrally formed. Table 1 shows an example of stored information in a control device (not shown) that manages the environmental security system when the package 101 is transported or stored using the resonance tag 100 with a storage sensor. is there.

  That is, in this embodiment, after confirming that the function of the resonant circuit 120 with a memory-type sensor is normal, the resonant tag 100 with a memory-type sensor is attached to the luggage 101. Then, the environmental temperature at which the load 101 is placed is set to a predetermined temperature (0 ° C. or lower), the sensor is reset, and the output wave from the sweepable oscillator is stored in the memory type through the receiving gate 103 having the antenna. It transmits to the resonance tag 100 with a sensor.

  Since the resonance tag 100 with a memory sensor receives a reflected wave having an intensity corresponding to the degree of resonance of the resonance circuit 120 with a memory sensor with respect to the frequency of the received output wave, the resonance frequency can be easily measured. .

  In the resonance tag, a plurality of resonance frequencies are set according to the standard, and the type of the resonance frequency is used as an ID for identifying the tag. Therefore, by measuring the resonance frequency, information on the identification ID of the resonance tag 100 with a memory-type sensor is obtained at the same time. Here, it is assumed that the ID code obtained from the ID identification resonance circuit 110 is 2. explain. About 14 types of identification IDs can be used.

  The receiving gate 203 receives the information sent from the resonance tag 100 with a storage sensor, stores it as verification data, and outputs the verification data to the delivery gate 104. Note that the acceptance gate 103 and the delivery gate 104 are electrically connected to a control device (not shown), and the control device manages information transmitted and received at the acceptance gate 103 and the delivery gate 104. .

  Table 1 shows an example of the storage information created based on the information read from the resonance tag 100 with a storage sensor at the receiving gate 103 and the information read from the resonance tag 100 with a storage sensor at the delivery gate 104. The contents shown in (A) to (C) are summarized as follows.

(A) ID code same, temperature judgment OK
(B) Same ID code, temperature judgment NG
(C) ID code mismatch, temperature determination OK

  In the case of (A), the package 101 is kept below the ambient temperature during transportation or storage, and the ID code (resonance tag identification code) matches the information read by the receiving gate 103 and the delivery gate 104. It is guaranteed that it was in a legitimate environment.

  In the case of (B), the ID code matches the information read by the receiving gate 103 and the delivery gate 104, but the package 101 is not maintained below the environmental temperature during transportation or storage, There is no guarantee.

  In the case of (C), the luggage 101 is maintained at an ambient temperature or lower throughout transportation or storage, but the ID codes do not match. Therefore, the resonance tag 100 with a memory-type sensor is replaced, and environmental protection is not performed.

  Here, even if the receiving gate 103 and the delivery gate 104 are constituted by a single reader, a memory type that is mounted on the luggage 101 within the detection range by adopting a frequency sweep method for detecting the resonance frequency. For example, a plurality of types of resonance tags with sensors 100 can be used in correspondence with the types of luggage 101. By adopting this method, it is possible to accurately detect each storage type resonance tag with a sensor 100 attached to the luggage 101 without colliding, and to reliably transmit and receive information. Note that the present invention is not limited to this method, and for example, a plurality of reading devices for the receiving gate 103 and the delivery gate 104 may be provided corresponding to the type of the resonance tag 100 with a storage sensor attached to the luggage 101.

  As described above, according to the resonance tag with a memory type sensor and the environmental security method using the resonance tag with a memory type sensor according to the present invention, when the resonance tag with a memory type sensor is attached to a baggage or the like, It is possible to ensure the environmental conditions during transportation or storage.

Next, another embodiment of the present invention will be described with reference to FIG.
FIG. 5 shows a resonance circuit of a type in which the inductance component changes.

  The resonance circuit 31 includes an antenna coil 32, a resonance frequency setting capacitor 33, a switch 34 including a memory type sensor, and a resonance frequency changing coil 35.

  In the resonance circuit 31, the resonance frequency is determined by the resonance frequency setting capacitor 33, the antenna coil 32, and the resonance frequency changing coil 35 at the start of environmental protection. Next, when the resonance tag using this resonance circuit goes out of the environmental security range even once, the switch 34 is turned on and short-circuited, and the resonance frequency setting capacitor 33 and the antenna coil 32 contribute to the determination of the resonance frequency. Since the resonance frequency changing coil 35 does not affect the resonance frequency, the resonance frequency at the start and end of environmental protection is different.

  6 and 7 show a resonance circuit of a type having a plurality of memory sensors and changing the resonance frequency in multiple stages.

  6 includes an antenna coil 42, a resonance frequency setting capacitor 43, a first switch 44 including a memory sensor, a first resonance frequency changing capacitor 45, and a second switch 46 including a memory sensor. And a second resonance frequency changing capacitor 47.

  Here, each of the first switch 44 and the second switch 46 is composed of a memory type sensor having different operating conditions. In this embodiment, the first switch 44 operates at 0 ° C., for example. The second switch 46 operates at, for example, 5 ° C., so that environmental protection can be performed under fine conditions.

  In the resonance circuit 41, the resonance frequency is determined by the resonance frequency setting capacitor 43 and the antenna coil 42 at the start of environmental protection. Next, when the resonance tag using this resonance circuit is exposed to an environment of 0 ° C. or more and less than 5 ° C., the first switch 44 is activated, and the first resonance frequency changing capacitor 45 is added. Contributes to the determination of the resonance frequency. When the resonance tag is exposed to an environment of 5 ° C. or higher, the second switch 46 is activated, and a second resonance frequency changing capacitor 47 is further added to contribute to the determination of the resonance frequency.

  Therefore, since the capacity of the resonance circuit changes depending on the temperature condition to which the resonance tag is exposed, it is possible to know how much environmental protection has been achieved by measuring the resonance frequency.

  The resonance circuit 51 of FIG. 7 includes an antenna coil 52, a resonance frequency setting capacitor 53, a first switch 54 including a memory sensor, a first resonance frequency changing coil 55, and a second switch 56 including a memory sensor. And a second resonance frequency changing coil 57.

  In the resonance circuit 51, at the start of environmental protection, the resonance frequency is determined by the resonance frequency setting capacitor 53, the antenna coil 52, the first resonance frequency changing coil 55, and the second resonance frequency changing coil 57. The Next, when the resonance tag using this resonance circuit is exposed to an environment of 0 ° C. or more and less than 5 ° C., the first switch 54 is activated and the first resonance frequency changing coil 55 is removed by a short circuit. Thus, the first resonance frequency changing coil 55 does not affect the resonance frequency. Further, when the resonance tag is exposed to an environment of 5 ° C. or higher, the second switch 56 is activated, and the second resonance frequency changing coil 57 is removed by a short circuit to change the second resonance frequency. The coil 57 does not affect the resonance frequency.

  Therefore, since the inductance component of the resonance circuit changes depending on the temperature condition to which the resonance tag is exposed, it is possible to know how much environmental protection has been achieved by measuring the resonance frequency.

  As another embodiment, it is preferable that these memory-type sensors have a reset function, and this reset function is activated. As shown in FIG. 8, the resonance circuit 41 of FIG. And a resonance tag 71 with a memory type sensor provided with a reset signal input means 72. At this time, the reading device 61 includes an oscillator 62 capable of transmitting a frequency, a resonance intensity measuring circuit 63, a resonance frequency measuring unit including an antenna coil 64, and a reset unit 65.

  In this case, since the reset signal input means 72 is provided, when the reset signal is transmitted from the reset means 65, the reset signal input means 72 receives the reset signal, and the first and second memory sensors. A reset signal can be sent to each sensor to return each sensor to its initial state.

  Since the memory type sensor can be reset to the initial state by providing the reset input means in this way, the resonant tag with the memory type sensor is collected after being used once, and after confirming the function of the tag, It can be re-used by attaching it again to a new package and supplying a measurement start signal again. As a result, the environmental security cost per time can be reduced, and the environmental load can be reduced because the cost is not discarded each time.

  In the above embodiment, the reset signal can be received to set the sensor to the initial state via the antenna, so that the ID code of the resonance tag with the memory type sensor and the sensor state can be read in a non-contact manner. Environmental protection without interfering with the transportation or storage process.

The figure which shows the resonance circuit of the resonance tag with a memory type sensor from which the capacitance of a resonance circuit changes. The figure which shows the structure of the memory type sensor using a bimetal. The figure which shows the structure of the memory-type sensor using a temperature-sensitive magnetic body. The figure which showed the outline | summary of the environmental protection method in the transportation using the resonance tag with a memory type sensor. The figure which shows the resonance circuit of the resonance tag with a memory type sensor from which the inductance of a resonance circuit changes. The figure which shows the resonance circuit of the resonance tag with a memory | storage type sensor from which the capacitance of a resonance circuit changes on several conditions. The figure which shows the resonance circuit of the resonance tag with a memory type sensor from which the inductance of a resonance circuit changes on several conditions. The figure which shows the resonance tag with a memory type sensor which provided the reset signal input means in the resonance circuit of FIG. 6, and a reader.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 31, 41, 51 ... Resonance circuit, 2, 32, 42, 52 ... Antenna coil, 3, 33, 43, 53 ... Resonance frequency setting capacitor, 4, 34 ... Switch, 5 ... Resonance frequency changing capacitor, DESCRIPTION OF SYMBOLS 10,20 ... Memory-type temperature sensor, 11 ... Bimetal, 12, 13 ... Plate spring, 14 ... Cantilever plate having claws, 21 ... Magnet, 22 ... Cantilever spring, 23 ... Temperature-sensitive magnetic body , 24 ... electromagnets, 25, 26 ... leaf springs, 27 ... electric terminals of the electromagnets, 44, 54 ... first switches, 45 ... first capacitors for changing the resonance frequency, 46, 56 ... second switches, 47 ... Second resonance frequency changing capacitor, 55 ... first resonance frequency changing coil, 57 ... second resonance frequency changing coil, 61 ... reading device, 65 ... reset switch, 71 ... resonance tag with memory type sensor, 72 ... Lise Door signal input means

Claims (9)

A resonant tag comprising a resonant circuit including an antenna,
The resonant circuit includes an additional circuit including at least one inductor or capacitor as a circuit element, and the additional circuit includes a switching element including a memory sensor that changes a state according to a change in an external environment. Resonant tag with sensor.   The resonant tag with a memory-type sensor according to claim 1, wherein the memory-type sensor is a sensor using a bimetal.   The resonance tag with a memory-type sensor according to claim 1, wherein the memory-type sensor is a sensor using a temperature-sensitive magnetic material.   The resonance tag with a memory type sensor according to any one of claims 1 to 3, wherein the memory type sensor has a sensor reset means for initializing the sensor.   5. The resonance with memory type sensor according to claim 4, wherein the resonance tag with memory type sensor has reset signal input means, and the sensor reset means is operated by a reset signal supplied from the reset signal input means. tag.   The resonance tag with a memory type sensor according to any one of claims 1 to 5, wherein a plurality of the memory type sensors are provided, and the state of each memory type sensor changes under different conditions.   7. The resonance tag with a memory type sensor has an ID identification resonance circuit having an antenna coil and a capacitor in addition to a resonance circuit having a memory type sensor. Resonance tag with memory type sensor. An environmental security method for guaranteeing an environment during transportation or storage of a baggage equipped with the resonance tag with a memory type sensor according to any one of claims 1 to 7,
A resonance frequency recording step of reading and recording a resonance frequency via an antenna of the resonance tag with a memory type sensor at the start of transportation or storage;
A resonance frequency comparison step of reading a resonance frequency via the antenna of the resonance tag with a memory type sensor and comparing the read resonance frequency with the resonance frequency recorded in the resonance frequency recording step at the end of transportation or storage; ,
An environmental security method comprising:   9. The environmental security method according to claim 8, wherein a sensor reset step for initializing a memory type sensor by inputting a reset signal is performed before the resonance frequency recording step.

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