JP2005135132A - Detection and sensing system for change in extrinsic factor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a detection and sensing system for change in an extrinsic factor capable of grasping environmental change in an article conveniently through the use of a tag. <P>SOLUTION: The system is provided with a noncontact IC tag having a resonance circuit with its resonance frequency set to change due to the change in the extrinsic factor and an IC chip connected to the resonance circuit, and a detector for sensing the output level of the tag within a predetermined frequency range including a predetermined resonance frequency of the IC tag at the occurrence of predetermined change in the extrinsic factor. In addition, the system is provided with a detection reader for reading information of the IC chip to individually identify the IC tag. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an external factor change detection detection system using a resonance tag and a non-contact IC tag.

While IC cards are becoming increasingly popular from the aspect of confidentiality of information, in recent years, non-contact type IC cards that send and receive information without contacting a reader / writer (reader / writer) have been proposed. A method of exchanging signals with a read / write device or performing signal exchange and power supply by electromagnetic waves is being put into practical use.
In recent years, various contactless IC tags in the form of sheets or bills, in which data loaded ICs are connected to antenna coils, have been proposed and attached to products and packaging boxes, etc. to prevent shoplifting, logistics systems, products It has come to be used for management.
Of course, a simple resonance tag having no IC is also used to detect the presence of an article.

Any of the simple resonance tags and IC tags that do not have the above-described ICs senses the presence of an article and identifies the article, and does not capture changes in external factors.
In the case of a resonance tag having an individually set resonance frequency, the presence of an article is detected and the article is identified, and a change in external factors is not captured.
In order to grasp the change in temperature, which is an external factor of goods, for example, the use of a temperature sensor and CPU, a button-type temperature monitoring device with a built-in memory and battery is conceivable. Because it is built-in, it is expensive at a few thousand yen.
In addition, there is a thermo label that changes color due to temperature change, but there is no automatic individual identification function, and visual confirmation is required one by one, and detection is not easy.
Thus, conventionally, the tag is exclusively used for sensing the presence of an article and identifying the article, and in order to grasp changes in the environment such as the temperature of the article, it is expensive like a temperature monitor device, Or, since it takes time to handle like a thermo label, it has not been used to grasp the environmental change of an article.
As a frequency identification method for a resonance tag, a dip meter method, an echo wave detection method, and the like are conventionally known as described in Japanese Patent Application Laid-Open No. 2000-49655.
JP 2000-49655 A

As described above, the tag is conventionally used exclusively for detecting the presence of an article and identifying the article, and has not been used for grasping an environmental change such as the temperature of the article. There has been a demand for a method that can easily grasp the environmental change of an article using the.
This invention respond | corresponds to this, and in order to grasp | ascertain the environmental change of articles | goods easily, it aims at providing the external factor change detection detection system using a tag.

The external factor change detection and detection system according to the present invention includes a resonance tag having a resonance circuit set so that a resonance frequency changes due to a change in the external factor, and the tag when a predetermined change in the external factor occurs. And a detector that senses the resonance tag in a predetermined frequency section including the predetermined resonance frequency.
Alternatively, the external factor change detection and detection system of the present invention includes a resonance circuit set so that the resonance frequency is changed by a change in the external factor, and a non-contact IC tag having an IC chip connected to the resonance circuit, And a detector for sensing the IC tag in a predetermined frequency section including a predetermined resonance frequency of the IC tag when a predetermined external factor changes. The information is read out and a reader for individually identifying the IC tag is provided.
Here, the predetermined resonance frequency of the resonance tag or IC tag when a change in an external factor occurs refers to a frequency (abnormal state) that is significantly different from the resonance frequency of the reference state (normal state).
If the resonance frequency in the reference state is set to 13.56 MHz that conforms to the proximity type of the ISO / IEC15693 standard, the system can be designed more easily.
If the resonance frequency in the abnormal state is the frequency band used for the anti-theft resonance tag, the system design can be made easier. Further, the predetermined frequency section including the resonance frequency is deviated from the resonance frequency. Means a permissible frequency section that can be detected due to the resonance effect of the resonance circuit, and hereinafter, it may be expressed without clearly indicating that such a frequency to be detected is permissible.
For example, “sensing in a predetermined frequency section including a resonance frequency” is also simply referred to as “sensing at the same frequency as the resonance frequency”.
Here, as a detector that senses the resonance tag (IC tag) in a predetermined frequency section including the resonance frequency, generally, an electromagnetic wave is transmitted to the resonance tag (IC tag), and the intensity of the electromagnetic wave in response is determined. And detecting at the same frequency as the resonance frequency and detecting whether or not the output of the obtained detector is at a level at the time of resonance of the resonance circuit of the resonance tag (IC tag).

And any one of the above external factor change sensing and detection system, wherein the change in the external factor is a change in the tag environment such as temperature, humidity, moisture, pressure, gas concentration, acceleration, and impact. It is a feature.
In addition, the external factor change detection and detection system described above is characterized in that the capacitance component of the resonance circuit is changed by the environmental change of the tag and the resonance frequency is changed. The resonance frequency is changed by opening or short-circuiting a part of the resonance circuit according to the environmental change.

Further, in any one of the above external factor change detection and detection systems, the change in resonance frequency due to the change in external factor is irreversible, and the change in characteristics irreversible with respect to the change in external factor in the resonance circuit. It is based on the element which has this.
Also, any one of the above external factor change detection and detection systems, characterized in that it is used for identification of the presence or absence of external factor change in an article to which a tag is attached, individual identification and classification of an article to which a tag is attached. It is what.
Further, the present invention is characterized in that it is used for classification, individual identification, management information rewriting and the like of articles that have changed external factors and those that have not.
Further, in any one of the above external factor change detection and detection systems, 13.56 MHz is used as a reference frequency before the change.
The external factor change detection and detection system according to any one of claims 2 to 9, wherein a predetermined frequency section including a predetermined resonance frequency of the IC tag when a change of a predetermined external factor occurs. The IC chip information is read out and the IC tag is individually identified by reading out the IC chip information in a predetermined frequency section including the reference frequency before the change. It is characterized by having a readout device.
Here, A and / or B includes one or both of A and B.

The tag used in the external factor change detection and detection system of the present invention is characterized by having a resonance circuit set so that the resonance frequency is changed by the change of the external factor.
The tag is a contactless IC tag having an IC chip connected to a resonance circuit.
The tag according to any one of the above, wherein the change in the external factor is an environmental change such as temperature, humidity, moisture, pressure, gas concentration, acceleration, and impact. There is a feature that the resonance frequency is changed by changing the capacitance component of the resonance circuit according to the environmental change.
A ceramic capacitor is used as an element that changes the capacitance component of the resonance circuit according to environmental changes.

(Function)
With this configuration, the external factor change detection and detection system of the present invention can provide an external factor change detection and detection system that can implement a method for easily grasping an environmental change of an article using a tag. It was.
Specifically, the tag includes a tag having a resonance circuit set so that the resonance frequency is changed by a change in external factors, and a detector that senses the tag in a predetermined frequency section including the resonance frequency of the tag. In the case where the external environment has changed, at least a tag whose external environment has changed can be detected, and from this, it can be determined that an article to which the tag is attached has been changed by the external environment.
A non-contact IC tag having a resonance circuit set so that the resonance frequency is changed by a change in an external factor, an IC chip connected to the resonance circuit, and a predetermined resonance frequency including a change in the resonance frequency of the IC tag. If it is equipped with a detection reader that detects the IC tag in the frequency section, and reads the information of the IC chip to identify the IC tag individually, it can detect the tag whose external environment has changed. Further, the information held by the IC chip of the tag can be grasped, whereby it can be determined that the article to which the tag is attached has undergone a change in the external environment, and the tag is attached. It is assumed that the individual information of the goods can be grasped.
Therefore, it is possible to determine whether or not the article to which the tag is attached has undergone a change in the external environment, or whether or not the article to which the tag is attached has undergone a change in the external environment. As well as being able to grasp individual information of the article, it is possible to identify and classify articles that have undergone changes in the external environment and articles that have not.
Examples of changes in external factors include changes in tag environment such as humidity, moisture, pressure, gas concentration, acceleration, and impact in addition to temperature.
Specifically, there is an example in which the resonance frequency is changed by changing the capacitance component of the resonance circuit by changing the environment of the tag.

In the external factor change detection and detection system according to the present invention, when the change in the resonance frequency with respect to the change in the external factor is reversible, the tag is placed near a tag in a predetermined frequency section including the changed resonance frequency of the tag. In the case where a detector or a detection reader is provided, it is possible to detect a change in a predetermined external factor continuously, periodically, or intermittently, and to detect a change in a desired external factor. It can be detected, identified, sorted, recognized, etc.
Alternatively, in the case of an IC tag, a change in a desired external factor can be stored in a memory at the time of the change, and then the stored data can be discriminated and classified.
However, when there is no detector or detection reader near the tag and the tag is attached and the article is moved to the detector or detection reader to check whether the external factor has changed, It is not possible to know exactly whether or not it has undergone changes in the physical factors.

On the other hand, when there is no detector or detection reader near the tag and the tag is attached and the article is moved to the detector or detection reader to check whether or not the external factor has been changed, A tag using an irreversible element that shows an irreversible change in frequency with respect to a change in external factor change is used so that a change in external factor remains in the history.
For example, by devising the composition of the dielectric of the capacitor and changing the dielectric itself according to the temperature, the capacitance change can be made irreversible with respect to the temperature.
As a specific example, a ceramic capacitor can be cited as an element that changes the capacitance component of the resonant circuit due to a temperature change. This is because the ceramic capacitor uses a range in which the capacitance change shows an irreversible temperature history. is there.
Further, an irreversible element such as a thermal fuse can be used in order to induce a change in the resonance frequency by utilizing an open circuit or a short circuit.

  By using the tag used in the present invention as described above, it is possible to provide an external factor change detection and detection system capable of easily grasping an environmental change of an article of the present invention using the tag. .

  As described above, the present invention makes it possible to provide an external factor change detection and detection system that can easily grasp an environmental change of an article using a tag.

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1A is a schematic diagram of a first example of a tag used in the external factor change sensing detection system of the present invention, and FIG. 1B is a diagram showing a resonance circuit thereof, and FIG. FIG. 2 is a schematic diagram of a second example of a tag used in the external factor change sensing detection system of the present invention, FIG. 2B is a diagram showing its resonance circuit, and FIG. 3 is an external factor change of the present invention. FIG. 4 is a diagram showing an example of an embodiment of a sensing detection system, and FIG. 4 is a frequency characteristic diagram for explaining a change in resonance frequency.
1 to 4, 120 is an element whose capacitance changes due to external factors (such as a ceramic capacitor), 130 is an antenna coil, 131 and 132 are terminal portions, 135 is a coil component, 140 is a connection wiring portion, and 150 is Insulating base material, 210 is an IC chip, 220 is an element whose capacitance changes due to external factors (such as a ceramic capacitor), 230 is an antenna coil, 235 is a coil component, 240 is a caulking connection part, 245 is a connection wiring part, 250 is an insulating film, 310 is a storage (freezer), 320 is an abnormality sensing reader, 321 is a processing unit, 322 is a gate (also referred to as a radio wave transmission / reception head), 330 is a normal article management reader, 331 is a processing unit, 332 Is a gate (also called a radio wave transmission / reception head), 340 is a temperature abnormality detection tag, 345 is an article (also called an object to be inspected), 345A Good, 345B is defective, 350 radio 360 is the conveyor belt.

First, a first example of a tag used in the external factor change sensing detection system of the present invention will be described with reference to FIG.
In the first example, as shown in FIG. 1A, an element (ceramic) whose capacitance component is changed in the antenna coil 130 due to an external factor change reversibly showing temperature dependence in the operating temperature range. This is a resonance tag of the circuit shown in FIG. 1B in which capacitors 120 and the like are connected in series. The antenna coil 130 and the element 120 whose capacitance changes due to external factors are arranged on one surface of the insulating film 150, and the terminal portion 131 and the outside of the antenna coil are connected by a connection wiring portion 140.
Further, the element 120 whose capacitance is changed by a change in external factors is disposed between the terminal portion 131 and the terminal portion 132.
In the circuit shown in FIG. 1B, only the capacitance component changes reversibly with the change in temperature in the circuit shown in FIG. The resonance frequency changes.
For example, as shown in FIG. 4, the frequency characteristic of the tag changes from a frequency characteristic having a resonance frequency at f1 of temperature T1 to a frequency characteristic having a resonance frequency at f2 of temperature T2.
In FIG. 4, 410 is the frequency characteristic at the temperature T1, and 420 is the frequency characteristic at the temperature T2.
In this case, by reading the tag with a reader for sensing the tag at the frequency f1 with a sufficiently short period and a reader for sensing the tag with the frequency f2 with a sufficiently short period, It is possible to know whether the temperature of the tag is at T1 or T2.
Therefore, if one temperature T1 is a tag temperature in a reference temperature state and the other temperature T2 is a tag temperature at a predetermined abnormality, the tag is sensed at a frequency f2 with a sufficiently short period. Thus, it is possible to determine the presence or absence of an abnormal temperature state of the tag, and from this, it is also possible to determine the presence or absence of a temperature change of an article with such a tag.
As described above, the tag of the first example can capture the presence / absence of an abnormal temperature state of the tag and the presence / absence of a temperature change as a change in resonance frequency.
Normally, in the reference temperature state, the resonance frequency is set to 13.56 MHz in accordance with the proximity type of ISO / IEC15693 standard.

As the connection wiring part 140, a conductive layer is formed on the antenna coil 130 via an insulating material, or the outside of the antenna coil 130 and the terminal part 131 are electrically connected by a wire, or an insulating property. A wiring portion for connection is provided on a surface of the base material 150 that is not on the antenna coil forming surface side, and this is caulked and connected to the outside of the antenna coil 130 and the terminal portion 131 (the caulking connection portion 240 in FIG. 2A). 241, see the connection of the connection wiring portion 245).
Examples of the insulating substrate 150 include PET (polyethylene terephthalate), polypropylene (PP), polyethylene, ABS, styrene, polyimide, glass epoxy, PETG, polycarbonate, paper, PVC, or acrylic, but the strength, heat resistance, Chemically resistant PET (polyethylene terephthalate) or polyimide is preferable.
The thickness of the insulating substrate 150 is usually 25 μm to 200 μm.
The metal material for forming the antenna coil 130 includes Cu, Al, etc., but Cu is preferable for miniaturization and narrowing of the antenna wiring.
From electrical characteristics, the thicknesses of Cu and Al are preferably 10 to 50 μm and 15 to 50 μm, respectively.

(Modification of the tag of the first example)
In the first example, the element 120 whose capacity is reversibly changed by a temperature-dependent external factor change is used as an element that changes the resonance frequency of the tag depending on the temperature change as an external factor. As an element used, an element whose capacitance changes due to a change in external factors is one that shows an irreversible capacitance change characteristic by showing a history with respect to a temperature change under a predetermined temperature change.
A modification of the first example is one that uses an element whose capacitance changes irreversibly due to an external factor change exhibiting such characteristics.
In the case of this modification, since the presence or absence of temperature change can be detected as the presence or absence of a capacity change in a predetermined capacity change history, at a frequency corresponding to the abnormal temperature of the tag, sufficiently short and periodically, There is no need to read the tag by a reader for detecting the tag, and the tag may be read by a reader for detecting the tag at a frequency corresponding to the abnormal temperature of the tag at least when desired.
Further, the element that causes the capacitance change irreversibly does not need to be a capacitor alone, and a fuse or the like may be used in combination.

Next, a second example of a tag used in the external factor change detection detection system of the present invention will be described with reference to FIG.
In the second example, as shown in FIG. 2A, an antenna coil 230 includes an element 220 (such as a ceramic capacitor) whose capacitance component changes due to an external factor change whose temperature component shows temperature dependence, and an IC chip 210. 2 is a non-contact type IC tag of the circuit shown in FIG. 2B, which are connected in series.
The antenna coil 230, the element 220 whose capacitance changes due to external factors change, and the IC chip 210 are arranged on one surface of the insulating film 250, and these are caulked and connected to the outside of the antenna coil 240 by caulking connection portions 240 and 241. Has been.
Note that the connection wiring portion 245 is provided on the surface of the insulating film 250 that is not on the antenna coil formation surface side, and is connected by caulking connection portions 240 and 241 respectively, as shown in FIG. A circuit is formed.
Also in the case of the second example, as in the first example, the element 220 whose capacitance changes due to a change in external factor due to a change in temperature reversibly changes its capacitance component. In the circuit, only the capacitive component changes and its resonant frequency changes.
If the resonance frequency of the operation in the reference temperature state before the temperature change is f12 and the resonance frequency at the desired temperature (abnormal temperature) after the temperature change is f22, as in the case of the first example, The desired temperature change can be detected as a change in resonance frequency by reading the tag with a reader that senses the tag at a frequency f22 with a sufficiently short period.
In this way, the tag of the second example can also capture the presence or absence of a predetermined temperature change of the tag as a change in resonance frequency.
In the case of the second example as well, in the reference temperature state, the resonance frequency is normally set to 13.56 MHz according to the proximity type of the ISO / IEC15693 standard.
The IC chip 110 is usually 1.0 mm × 0.9 mm square and about 150 μm thick, and the other parts can be the same as those in the first example.

In the second example, since the IC chip 210 is provided, the article information can be known in more detail from the memory in addition to the presence or absence of the temperature change.
In addition, since the tag of the second example includes the IC chip 210, the presence or absence of temperature change can be stored in the memory.

(Modification of the tag of the second example)
In the second example, the element 220 whose capacity changes reversibly due to a temperature-dependent external factor change is used as an element that changes the resonance frequency of the tag depending on the temperature change as an external factor. A tag that uses an element that exhibits irreversible capacity change characteristics by showing a history with respect to a temperature change under a predetermined temperature change is used as an element whose capacity changes due to a change in external factors. It is mentioned as a modification of the example of 2.
In the case of this modification, the presence / absence of a temperature change can be detected as the presence / absence of a capacity change in a predetermined capacity change history. Therefore, at a frequency f22 corresponding to the abnormal temperature of the tag, with a sufficiently short period, There is no need to read the tag by a reader for detecting the tag, and the tag may be read by a reader for detecting the tag at a frequency f22 corresponding to the abnormal temperature of the tag at least when desired.

The tag of the first example and the tag of the second example both grasp the temperature change of the tag as the change of the resonance frequency of the resonance circuit, but the humidity, moisture, pressure, gas concentration, The frequency characteristics of the circuit may be changed according to environmental changes such as acceleration and impact, and these changes may be grasped as changes in the resonance frequency of the resonance circuit.
Actually, it will be easy to grasp these changes in the environment as changes in the capacitance component of the circuit and to grasp them as changes in the resonance frequency.
For example, a dielectric material for forming a capacitive component is mixed or dispersed with a material that changes the dielectric material itself as the temperature changes.

Next, an example of an embodiment of the external factor change detection system according to the present invention will be briefly described with reference to FIG.
In this example, in the IC tag of the second example shown in FIG. 2, an element (ceramic capacitor or the like) 220 whose capacitance is changed by a change in external factors is provided with an irreversible capacitance change characteristic under a predetermined temperature range. Articles such as fresh foods using the IC tag of the modified example of the second example replaced with an element whose capacity changes due to a change in external factors shown, and individually wrapped and packaged in a box or the like A large number of 345 are stored in the storage 310, which is a freezer, and when they are taken out and used one by one when necessary, the presence / absence of a change in the resonance frequency of each IC tag is regarded as the presence / absence of a temperature change. This is a system that discriminates the presence or absence of a temperature change and classifies a product having no predetermined temperature change as a non-defective product 345A and a product having a predetermined temperature change as a good product 345B.

An example of the operation of this system will be briefly described below.
The articles 345 are stored in the storage 310, which is a freezer, and when used, placed on the conveyor belt 360, taken out one by one, and sequentially passed through the gate 322, and the abnormality detection reader 320 is informed whether the resonance frequency has changed. To confirm.
The anomaly detection reader 320 was able to determine whether or not communication was possible at the first frequency f32 that is the resonance frequency when there was a predetermined temperature change. It is assumed that there was no predetermined temperature change.
The abnormality detection reader 320 includes a gate 322 that is a radio wave transmission / reception head that performs communication at a first frequency f32 (corresponding to f2 in FIG. 4) and a processing unit 321, and a display for displaying the result. It is used here.
Articles determined to have a temperature change by the anomaly detection reader 320 are classified and collected as defective products 345B.
The non-defective product 345A determined to have no predetermined temperature change proceeds as it is, and further passes through the gate 332, whereby the normal article management reader 330 performs confirmation of individual information and related processing.
The normal article management reader 330 includes a gate 332 and a processing unit 331 that are radio wave transmission / reception heads that perform communication at a second frequency f31 (corresponding to f1 in FIG. 4) that is a resonance frequency when there is no predetermined temperature change. Here, a display provided with a display for displaying the result of confirmation, processing, etc. is used here.
In this way, it is possible to discriminate and manage only non-defective products 345A that have not undergone a predetermined temperature change.

As a modification of this example, in the present system, as the tag, the element showing the history with respect to the change of the external factor and showing the irreversible capacity change characteristic as shown in the first example is used. A system using a tag is listed.
In the case of this modification, since the tag does not have an IC chip, it is possible to determine whether or not each article has a predetermined temperature change and to classify based on it, but to grasp the individual information of each article and process based on this It can hardly be done except in very simple cases.

As another external factor change detection detection system, the tag of the first example and the tag of the second example are used, and the predetermined frequency is the same as the resonance frequency of the tag at a predetermined abnormal temperature different from the normal use temperature. There is also a system in which the tag is read out by a reader that senses the tag at a short period, thereby detecting the presence or absence of a change in the resonance frequency, thereby identifying and classifying the article.
The external factor change detection and detection system of the present invention is not limited to the above.
For example, when an element whose capacitance changes due to a change in external factor is used as an element that changes the resonance frequency of a tag simply depending on a change in temperature as an external factor, as described above, the desired temperature The detection of the change, that is, the detection of the abnormal temperature, can be regarded as a change in the resonance frequency by reading the tag with a reader that detects the tag at a frequency with a sufficiently short period. As described above, a plurality of abnormality detection readers each having a resonance frequency of the tag corresponding to each temperature may be used to communicate with the tag to detect and detect the presence or absence of temperature abnormality.
In this case, the temperature change can be grasped more accurately.

FIG. 1A is a schematic diagram of a first example of a tag used in the external factor change sensing detection system of the present invention, and FIG. 1B is a diagram showing a resonance circuit thereof. FIG. 2A is a schematic diagram of a second example of a tag used in the external factor change sensing detection system of the present invention, and FIG. 2B is a diagram showing a resonance circuit thereof. It is the figure which showed one example of embodiment of the external factor change detection detection system of this invention. It is a frequency characteristic diagram for demonstrating the change of a resonant frequency.

Explanation of symbols

120 Element whose capacitance changes due to external factor change (ceramic capacitor, etc.) 130 Antenna coil 131, 132 Terminal portion 135 Coil component 140 Connection wiring portion 150 Insulating insulating substrate 210 IC chip 220 Capacitance change due to external factor change Elements (ceramic capacitors, etc.) 230 Antenna coil 235 Coil component 240 Caulking connection part 245 Connection wiring part 250 Insulating film 310 Storage (freezer)
320 Anomaly detection reader 321 Processing unit 322 Gate (also referred to as a radio wave transmission / reception head)
330 Normal article management reader 331 Processing unit 332 Gate (also referred to as a radio wave transmission / reception head)
340 temperature abnormality detection tag 345 article (also called inspection object)
345A non-defective product 345B defective product 350 radio wave 360 conveying belt

Claims (10)

  In a predetermined frequency section including a resonance tag having a resonance circuit set so that the resonance frequency is changed by a change in an external factor, and a predetermined resonance frequency of the tag when a change in a predetermined external factor occurs An external factor change detection detection system comprising a detector for detecting a resonance tag.   A non-contact IC tag having a resonance circuit set so that a resonance frequency is changed by a change in external factors, an IC chip connected to the resonance circuit, and the IC when a predetermined change in external factors occurs An external factor change detection and detection system comprising: a detector that detects an IC tag in a predetermined frequency section including a predetermined resonance frequency of the tag.   3. The external factor change detection and detection system according to claim 2, further comprising a reader that reads information of an IC chip and individually identifies an IC tag. .   4. The external factor change detection and detection system according to claim 1, wherein the change of the external factor is a tag environment such as temperature, humidity, moisture, pressure, gas concentration, acceleration, and impact. An external factor change detection detection system characterized by being a change.   5. The external factor change detection and detection system according to claim 4, wherein the resonance frequency is changed by changing the capacitance component of the resonance circuit according to the environmental change of the tag. system.   6. The external factor change detection and detection system according to claim 5, wherein the resonance frequency is changed by opening or short-circuiting a part of the resonance circuit according to the environmental change of the tag. Detection system.   7. The external factor change detection and detection system according to claim 1, wherein the resonance frequency change due to the external factor change is irreversible, and has an irreversible characteristic in the resonance circuit. An external factor change sensing detection system characterized by that.   8. The external factor change detection detection system according to any one of claims 1 to 7, wherein identification of presence / absence of external factor change in an article to which a tag is attached, individual identification and classification of an article to which a tag is attached. An external factor change detection detection system characterized by being used in a system. The external factor change detection and detection system according to claim 1, wherein 13.56 MHz is used as a reference frequency before change. 10. The external factor change detection and detection system according to claim 2, wherein the IC tag has a predetermined frequency section including a predetermined resonance frequency of the IC tag when a predetermined external factor change occurs. A reader that reads information on the chip and individually identifies the IC tag, and / or a read that reads information on the IC chip and identifies each IC tag in a predetermined frequency section including the reference frequency before the change. An external factor change detection detection system characterized by comprising a machine.

Images