JP2014230062A - Id tag, shoes, id tag system and id information transmission method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ID tag which allows for reduction of replacement frequency of a battery, and to provide shoes, an ID tag system and an ID information transmission method.SOLUTION: An ID tag is provided in shoes and includes a piezoelectric element generating a current depending on a pressure being applied to the shoe while walking, a charger for charging with a current generated from the piezoelectric element, an ID information holding circuit for holding ID information, and an antenna provided on the outside of the shoes, and performing wireless transmission of the ID information held in the ID information holding circuit depending on the power from the charger.

Description

  The present invention relates to an ID tag, shoes, an ID tag system, and an ID information transmission method.

  In order to check whether a child is involved in an incident while attending school, a system has been developed that uses an IC (Integrated Circuit) tag to monitor the children going to and from school.

  FIG. 8 is a block diagram showing a configuration of a school attendance and school management system using an active tag according to related technology. The school attendance school management system 100 is a system for checking the state of a child's attendance at school. The active tag 200 is a small tag and is carried by a child. The reader 300 is a machine that reads a signal from the active tag 200, and is installed, for example, near a school gate.

  The active tag 200 includes a control unit 201 as a main component. The control unit 201 includes an antenna (ANT) 202, an RF (Radio Frequency) circuit 203, a control circuit 204, and a battery 205.

  The antenna 202 performs wireless communication with the ANT 302 of the reader 300. The RF circuit 203 converts the information stored in the control circuit 204 into information in a format to be transmitted by wireless communication using the power supplied from the battery 205 and outputs the information to the antenna 202. The antenna 202 transmits the information to the ANT 302 wirelessly.

  The reader 300 outputs the information of the active tag 200 received by the ANT 302 to the control circuit 301. The control circuit 301 outputs the information to the school attendance management system 100. With this information, the school attendance management system 100 detects that the child has attended school or left school.

  The school attendance and school management system 100 shown in FIG. 8 manages data of school attendance and school attendance as follows. When the child goes to school or leaves the school, the child carrying the active tag 200 approaches the reader 300 installed near the school gate. The ANT 302 of the reader 300 detects weak wireless communication information periodically transmitted from the antenna 302 by the active tag 200. The control circuit 301 transmits information transmitted by the active tag 200 received by the ANT 302 to the school attendance management system 100. The school attendance and school management system 100 manages data of school attendance and school attendance by receiving information.

  Patent document 1 is mentioned as an example of another school attendance management system. Patent Document 1 discloses a passive IC tag device that generates power using a radio signal output from a reading gate, and is activated by the power to transmit IC tag information.

JP 2007-264723 A

  Since the active tag 200 of the related technology shown in FIG. 8 periodically performs wireless communication with the power from the battery 205, the power of the battery 205 continues to be consumed. Therefore, when the battery 205 is used for a certain period or longer, the wireless communication of the active tag 200 becomes impossible with the remaining power of the battery 205. As a result, it becomes impossible for the going-to-go school management system 100 to grasp the school attendance and the going-out school of the child who possesses the active tag 200, and the detection of the accident of the child at the time of going to school and the involvement in the incident is delayed. Therefore, it is necessary to monitor the remaining power of the battery 205 and periodically replace the battery 205.

  The IC tag device according to Patent Document 1 is a passive signal transmission device and does not use a battery.

  The present invention has been made to solve such problems, and an object thereof is to provide an ID tag, shoes, an ID tag system, and an ID information transmission method capable of reducing the number of battery replacements. To do.

  The first aspect of the present invention includes an ID tag provided on a shoe. The ID tag includes a piezoelectric element that generates a current in response to pressure applied to the shoes during walking, a rechargeable battery that is charged by a current generated from the piezoelectric element, an ID information holding circuit that holds ID information, An antenna that is provided outside the shoe and wirelessly transmits the ID information held in the ID information holding circuit according to the power from the rechargeable battery.

The second aspect of the present invention includes an ID information transmission method for an ID tag provided on a shoe. This ID information transmission method causes an ID tag to execute the following steps (a) to (d).
(A) holding ID information in advance;
(B) generating an electric current according to the pressure applied to the shoes during walking;
(C) Charging is performed by the generated current, and (d) ID information held in advance according to the charged power is wirelessly transmitted by an antenna provided on the outer surface of the shoe.

  The present invention can provide an ID tag, shoes, an ID tag system, and an ID information transmission method that can reduce the number of battery replacements.

It is a block diagram which shows an example of a structure of the ID tag concerning Embodiment 1. FIG. It is a block diagram which shows an example of a structure of the active tag concerning Embodiment 2. FIG. FIG. 6 is an image diagram showing an example of a configuration of a piezoelectric circuit according to a second embodiment. It is an image figure which shows an example of a structure of the insole concerning Embodiment 2. FIG. FIG. 10 is a block diagram illustrating an example of a configuration of a fixed band unit according to a second embodiment. It is an image figure which shows an example of the connection of the insole, shoes, and fixed band part concerning Embodiment 2. FIG. FIG. 10 is an image diagram illustrating an example of an appearance of a shoe when a fixed band portion is attached to the outside of the shoe in the second embodiment. It is a block diagram which shows the structural example of the ID tag system using the active tag concerning Embodiment 2. FIG. It is a block diagram which shows the structure of the school attendance and school management system using the active tag concerning a related technique.

Embodiment 1
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram illustrating an example of a configuration of an ID tag according to the first embodiment.

  An ID (IDentification) tag 1 is an ID tag provided on a shoe, and emits radio waves with electric power stored in a battery during communication. The ID tag 1 is a so-called active tag or semi-active tag. For example, the ID tag 1 may always emit radio waves or intermittently transmit radio waves. As an example of the latter, the ID tag 1 communicates at regular intervals using a clock or the like built in the tag and pauses at other times, thereby intermittently transmitting radio waves and consuming power. It may be a self-communication type tag that can be suppressed. Alternatively, the ID tag 1 may be a standby communication type tag that waits for a call from a reader without performing communication activation by itself, or starts communication with information such as a switch provided in the tag itself.

  The ID tag 1 includes a piezoelectric element 2, a rechargeable battery 3, an ID information holding circuit 4, and an antenna (ANT) 5. The piezoelectric element 2 generates an electric current according to the pressure applied to the shoe during walking of the user of the shoe provided with the ID tag 1. The piezoelectric element 2 can be provided at a portion between the sole of the user and the ground, such as an insole or insole of a shoe, or the sole (sole) of the shoe. This is because by providing the piezoelectric element 2 at such a location, pressure applied between the user's sole and the ground is applied to the piezoelectric element during walking (particularly, contact between the ground and the human sole).

  The rechargeable battery 3 is charged by a current generated from the piezoelectric element 2. The rechargeable battery 3 is a secondary battery such as a nickel / hydrogen rechargeable battery, a nickel / cadmium storage battery, or a lithium ion secondary battery.

  The ID information holding circuit 4 is an IC that holds ID information relating to a shoe user provided with the ID tag 1.

  The antenna 5 is an antenna that is provided outside the shoe and wirelessly transmits the ID information held in the ID information holding circuit 4 according to the power from the rechargeable battery 3. The reader of the ID tag 1 receives ID information from the antenna 5 and manages information related to the safety of the user.

  The antenna 5 is provided, for example, at the upper of a shoe (part other than the shoe sole in the shoe). Here, the antenna 5 may be simply attached to the upper of the shoe, or may be fixed to the shoe by a shoe band covering the shoe. Or the antenna 5 may be provided in the shoe band which covers shoes.

Hereinafter, the ID information transmission method of the ID tag 1 will be described.
1. The ID tag 1 holds ID information in the ID information holding circuit 4 in advance.
2. When the user walks while wearing shoes, the piezoelectric element 2 generates an electric current according to the pressure applied to the shoes during walking.
3. The rechargeable battery 3 is charged by a current generated from the piezoelectric element 2.
4). The ID information held in advance according to the electric power charged in the rechargeable battery 3 is wirelessly transmitted by the antenna 5 provided outside the shoe.

  The ID tag 1 described above is charged with power necessary for wireless communication according to the user's walking. Therefore, the number of battery replacements can be reduced compared to the case where charging is not performed.

  The ID tag 1 may constitute an ID tag system and a receiving device that receives ID information wirelessly transmitted from the ID tag 1.

Embodiment 2
Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram of an example of the configuration of the active tag according to the second embodiment.

  The active tag 10 is an ID tag that can be attached to and detached from a shoe, and roughly includes a battery unit 11, a control unit 12, and a connector 16 for connecting them. Here, the battery unit 11 is built in the insole of the shoe, and the control unit 12 is built in the fixed band part on the side surface of the shoe.

  The battery unit 11 includes a piezoelectric circuit 13 and a capacitor 14. The piezoelectric circuit 13 generates an electric current according to the pressure applied from the soles to the insole when the user walks.

  FIG. 3 is a block diagram illustrating an example of the configuration of the piezoelectric circuit 13. The piezoelectric circuit 13 includes a piezoelectric element unit 20 (piezoelectric element) and a rectifying unit 21. The piezoelectric element unit 20 is an element that generates a current by pressure deformation (shrinkage) due to pressurization of a user's walking motion, and is, for example, a piezo element. A dotted line in the piezoelectric element portion 20 in FIG. 3 shows a deformation image when the piezoelectric element portion 20 is pressurized.

  The rectifying unit 21 rectifies the current from the piezoelectric element unit 20 and outputs the rectified current to the battery 14. The rectifying unit 21 is configured by, for example, a diode.

  Hereinafter, returning to FIG. The battery 14 (rechargeable battery) stores the current from the piezoelectric element unit 20 rectified by the rectifying unit 21 and outputs electric power to the control unit 12 via the power cable 15 and the connector 16. In other words, the battery 14 is a power source of the control unit 12. A specific example of the battery 14 is as described above.

  The power cable 15 is a cable that connects the battery unit 11 and the connector 16, and supplies power from the battery 14 to the control unit 12. Here, the power cable 15 is a cable that can be detached from the connector 16. Therefore, the power storage of the battery 14 is possible not only by the current from the piezoelectric circuit 13 but also from commercial power (for example, a household outlet).

  The connector 16 connects the control unit 12 and the battery unit 11, and supplies power supplied from the power cable 15 to each unit (RF circuit 17, control circuit 18, and antenna 19) of the control unit 12.

  The control unit 12 includes an RF circuit 17, a control circuit 18, and an antenna 19. The RF circuit 17 modulates a high frequency carrier wave based on the ID information stored in the control circuit 18 to generate a radio signal.

  The control circuit 18 is a circuit that controls the operation of the RF circuit 17 and the antenna (ANT) 19, and also has a function as an ID information holding circuit that holds ID information transmitted to the reader. The ID information is personal information of the user such as the name and address of the shoe user and the organization to which the shoe belongs (for example, the school to which the shoe belongs). The control circuit 18 outputs this ID information to the RF circuit 17.

  The antenna 19 transmits the signal output from the RF circuit 17 wirelessly. The wireless communication method is the same as that using, for example, general RFID (Radio Frequency IDentification).

  In addition, between the piezoelectric circuit 13 and the capacitor | condenser 14, between the connector 16 and the control part 12, and between each part of the control part 12 are connected with the conducting wire which can transmit a signal and electric power.

  FIG. 4A is an image diagram illustrating an example of a configuration of an insole provided with the battery unit 11. FIG. 4A shows a top view of the insole on the upper side and a side view of the insole on the lower side. The insole 30 has a shape that covers the entire sole (sole) of the person, and is provided between the shoe and the sole of the person. A piezoelectric circuit 13 is built in the front portion of the insole 30, in particular, a stepping portion on the sole of a person. By incorporating the piezoelectric circuit 13 in this place of the insole 30, pressure is applied to the piezoelectric circuit 13 when a person walks and gets his feet on the ground. As a result, the piezoelectric circuit 13 generates a current for the capacitor 14 to store electricity. Here, the description will be made assuming that the walking direction of the person is defined as the front.

  The battery 14 is built in the rear end portion of the insole 30 (portion below the person's heel). The battery 14 stores electricity using the current generated by the piezoelectric circuit 13. A power cable 15 protrudes from the battery 14, and the battery 14 outputs power to the power cable 15.

  FIG. 4B is an image diagram illustrating an example of a configuration of a fixed band unit in which the control unit 12 is provided. 4B shows a top view of the fixed band portion on the upper side, and a side view of the fixed band portion on the lower side. The fixed band portion 31 is a band fixed to the outside of the shoe, and is made of a shrinkable resin material. The fixing band portion 31 covers the outer edge portion of the shoe and the heel portion. The fixed band portion 31 has a shape that can be fitted into the outer shape of the shoe. Moreover, since the fixing band part 31 has contractibility, it can prevent taking off from shoes easily by walking.

  In the fixed band portion 31, the connector 16 is built in a portion above the heel, and the control portion 12 is built in a rear end portion (portion below the human heel). The connector 16 is located above the control unit 12. The connector 16 supplies power from the power cable 15 to the control unit 12. The control unit 12 wirelessly transmits the ID information based on the supplied power.

  FIG. 5 is an image diagram showing an example of the connection of the insole, the shoes, and the fixed band portion. In FIG. 5, the insole 30 is mounted inside the shoe 32. As described above, the power cable 15 connects the capacitor 14 in the insole 30 and the connector 16 in the fixed band portion 31. Since the power cable 15 is a detachable cable, the user can freely detach the insole 30 from the fixed band portion 31. Therefore, either the insole 30 or the fixed band portion 31 can be freely replaced with a new one.

  Further, the user can freely detach the insole 30 from the shoe 32 and can freely detach the fixed band portion 31 from the shoe 32. That is, the user can freely remove the active tag 10 from the shoe 32.

  FIG. 6 is an image diagram showing an example of the appearance of the shoe 32 when the fixed band portion 31 is attached to the outside of the shoe 32. Since the fixed band portion 31 is fixed to the shoe 32, the fixed band portion 31 does not hinder the user's walking. It can be said that this shoe 32 is a shoe provided with the active tag 10 according to the second embodiment.

  As described above, the battery 14 is built in the lower part of the heel of the insole 30, and the connector 16 is built in the upper part of the heel of the fixed band part 31. That is, since both are located behind the human foot, the distance to which the power cable 15 must be connected is short. Furthermore, since the power cable 15 only needs to be provided at the rear end portion (the heel portion of the person) of the shoe 32, the power cable 15 can be used for the user to move his / her foot by walking compared to the power cable 15 provided in front. The cable 15 is unlikely to be a hindrance.

  FIG. 7 is a block diagram illustrating a configuration example of an ID tag system using an active tag. The ID tag system 90 includes an active tag 10, a reader 40, and a school attendance and school management system 50. As described above, the active tag 10 can be used to manage, for example, a child's going to and from school.

  The reader 40 is a receiving device that reads a signal from the active tag 10 and is installed, for example, near a school gate. The reader 40 includes an antenna (ANT) 41 and a control circuit 42. The antenna 41 receives the radio signal output from the antenna 19 of the control unit 12 and outputs it to the control circuit 42. The control circuit 42 extracts the ID information of the control circuit 18 from the radio signal output from the antenna 41 and outputs it to the school attendance management system 50.

  Based on the ID information extracted by the control circuit 18, the school attendance school management system 50 detects that a child who is a user of the shoes 32 has attended school or left school.

  The ID tag system 90 shown in FIG. 7 operates as follows, for example. When the child goes to school or leaves the school, the child wearing the active tag 10 on the shoe 32 approaches the reader 40 installed near the school gate. The antenna 41 of the reader 40 detects weak wireless communication information periodically transmitted by the active tag 10. The control circuit 42 transmits information transmitted by the active tag 10 received by the antenna 41 to the school attendance management system 50. The school attendance / school attendance management system 50 manages the data of school attendance and school attendance by receiving information.

  Here, the active tag 10 is attached to a child's shoe 32. Therefore, the pressure deformation of the piezoelectric element portion 20 due to the pressure applied to the piezoelectric element portion 20 in the piezoelectric circuit 13 built in the insole 30 is repeated by raising and lowering the foot by walking the child.

  While the child's foot raising / lowering operation (walking operation) continues, the current generated from the piezoelectric element unit 20 is rectified by the rectifying unit 21 and continuously output to the battery 14. Since the battery 14 stores electricity with the current, the electric power for continuing to drive the control unit 12 is continuously supplied from the battery 14. That is, when the child is walking, the active tag 10 can always store the electric power necessary for driving itself. Thereby, the possibility that the active tag 10 cannot wirelessly communicate with the reader 40 due to power shortage can be reduced. Therefore, the active tag 10 has an effect that the school attendance and school management system 50 can more reliably grasp the school attendance and school attendance of the child who possesses the active tag 10.

  In FIG. 8, the attending school management system 100 that uses the active tag 200 that drives the battery 205 as a power source cannot detect the attending school of the child as the power of the battery 205 decreases. As a result, there was a problem that a child's accident at the time of going to and from school was delayed and the detection of being involved in the incident was delayed. Therefore, it is necessary to monitor the remaining power of the battery 205 and to periodically replace the battery 205. However, the active tag 10 according to the second embodiment can save such management effort.

  Furthermore, the active tag 10 according to the second embodiment also has the following effects.

  The piezoelectric element unit 20 can be built in the insole 30. For this reason, there is no need to attach the piezoelectric element portion 20 to the shoe 32, and power can be supplied to the battery 14 by walking. Furthermore, the battery 14 can be charged only by walking without being conscious of the user side. In addition, in order to walk naturally without a user's consciousness, it is desirable that the capacitor 14 is also built in the insole 31.

  The active tag 10 includes a fixed band portion 31 fixed to the outside of the shoe 32, and the fixed band portion 31 can incorporate the antenna 19. That is, the antenna 19 is fixed to the outside of the shoe 32. Thereby, in the wireless space when the antenna 19 and the antenna 41 transmit and receive wirelessly, it is possible to easily ensure an environment that is not shielded appropriately for communication. Further, the antenna 19 can be easily fixed as compared with the case where the antenna 19 is simply mounted outside the shoe 32.

  The battery 14 is built in the insole 30, and the battery 14 and the control unit 12 (particularly the antenna 19) can be connected by a removable power cable 15. Thereby, each part can be replaced | exchanged at the time of the failure of the battery part 11 or the control part 12. FIG. Furthermore, by removing the power cable 15 from the connector 16, the battery 14 can be charged from commercial power.

  The battery 14 may be built in the rear end portion of the insole 30. Thus, when the user (especially a child) of the shoe 32 performs an operation of walking or running, the impact on the capacitor 14 is less than when the capacitor 14 is provided in another place (for example, on a toe). Thus, the possibility of damage to the battery 14 can be reduced.

  The fixing band portion 31 can be detachable from the shoe 32. Thus, the user can easily wash the shoe 32 with the fixed band portion 31 removed. Therefore, there is an effect that the hygiene aspect of the shoes 32 can be secured.

  The fixed band portion 31 may be formed of a shrinkable resin material. Thereby, since it becomes possible to mount | wear with the control part 12 to the exterior of the shoes 32 in use, the burden which purchases a dedicated shoes newly on the user side can be eliminated. Furthermore, since the fixing band part 31 has contractibility, it can prevent taking off from the shoes 32 easily by walking. Furthermore, since the fixed band portion 31 is formed of a resin material, the antenna 19 can be protected from external impacts. In order to protect the RF circuit 17 and the control circuit 18 from external impacts, it is desirable that these circuits are also incorporated in the fixed band portion 31.

  The control unit 12 (particularly the antenna 19) may be built in the rear end portion of the fixed band unit 31. Thereby, since both the battery part 11 and the control part 12 will be located in the user's heel vicinity, the length of the power cable 15 which connects them can be shortened. Thereby, the power cable 15 can be made into a length that does not hinder the user's walking. Furthermore, since the power cable 15 only needs to be provided at the rear end portion of the shoe 32, the power cable 15 is less likely to be a hindrance for the user to move his / her foot by walking compared to the power cable 15 provided in front. . Furthermore, when the user (especially a child) of the shoes 32 performs an operation of walking or running, the impact on the control unit 12 is greater than when the control unit 12 is provided in another place (for example, on a toe). As a result, the possibility of damage to the control unit 12 can be reduced. Note that the RF circuit 17 and the control circuit 18 are also preferably built in the rear end portion of the fixed band portion 31 for the same reason.

  The piezoelectric circuit 13 may be built in a stepping portion of the insole 31. Thereby, compared with the case where the piezoelectric circuit 13 is provided in the other part (for example, heel part) of the insole 31, it is possible to increase at least one of the magnitude of the force applied to the piezoelectric circuit 13 and the area to which the force is applied. it can. Therefore, the amount of current generated by the piezoelectric circuit 13 can be increased, and the user can charge the battery 14 more efficiently.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention. For example, the shape and material of the fixed band portion 31 are not limited to those exemplified in the second embodiment. The fixed band portion 31 may be formed of a resin material having no contractibility, or may be formed of a material other than the resin material having contractility. Furthermore, the positions of the battery unit 11, the control unit 12, and the connector 16 are not limited to those illustrated in the second embodiment.

Hereinafter, various embodiments of the present invention will be additionally described.
(Appendix 1)
An ID tag provided on a shoe,
A piezoelectric element that generates an electric current in response to pressure applied to the shoe during walking;
A rechargeable battery that is charged by a current generated from the piezoelectric element;
An ID information holding circuit for holding ID information;
An ID tag, comprising: an antenna that is provided outside the shoe and wirelessly transmits ID information held in the ID information holding circuit in accordance with power from the rechargeable battery.
(Appendix 2)
The piezoelectric element is built in the insole of the shoe,
The ID tag according to attachment 1.
(Appendix 3)
A fixed band fixed to the outside of the shoe, the fixed band having the antenna;
The ID tag according to attachment 2.
(Appendix 4)
The rechargeable battery is provided on the insole, and the rechargeable battery and the antenna are connected by a removable power cable.
The ID tag according to attachment 3.
(Appendix 5)
The rechargeable battery is built in the rear end of the insole,
The ID tag according to attachment 4.
(Appendix 6)
The fixing band is removable from the shoe;
The ID tag according to any one of appendices 3 to 5.
(Appendix 7)
The fixing band is formed of a shrinkable resin material.
The ID tag according to any one of appendices 3 to 6.
(Appendix 8)
A shoe comprising the ID tag according to any one of appendices 1 to 7.
(Appendix 9)
The ID tag according to any one of appendices 1 to 7, and
An ID tag system comprising: a receiving device that receives the ID information wirelessly transmitted from the ID tag.
(Appendix 10)
An ID information transmission method for an ID tag provided on a shoe,
Holding ID information in advance;
Generating a current in response to pressure applied to the shoe during walking;
Charging with the generated current; and
Wirelessly transmitting ID information held in advance according to the charged power by an antenna provided outside the shoe. ID information transmitting method.
(Appendix 11)
The antenna is built in the rear end of the fixed band,
The ID tag according to attachment 5.
(Appendix 12)
The piezoelectric element is built in a foot step portion of the insole,
The ID tag according to any one of appendices 2 to 6.

DESCRIPTION OF SYMBOLS 1 ID tag 2 Piezoelectric element 3 Rechargeable battery 4 ID information holding circuit 5 Antenna 10 Active tag 11 Battery part 12 Control part 13 Piezoelectric circuit 14 Accumulator 15 Power cable 16 Connector 17 RF circuit 18 Control circuit 19 Antenna 20 Piezoelectric element part 21 Rectification Part 30 Insole 31 Fixed band part 32 Shoes 40 Reader 41 Antenna 42 Control circuit 50 Climbing and attending school management system 90 ID tag system

Claims (10)

An ID tag provided on a shoe,
A piezoelectric element that generates an electric current in response to pressure applied to the shoe during walking;
A rechargeable battery that is charged by a current generated from the piezoelectric element;
An ID information holding circuit for holding ID information;
An ID tag, comprising: an antenna that is provided outside the shoe and wirelessly transmits ID information held in the ID information holding circuit in accordance with power from the rechargeable battery. The piezoelectric element is built in the insole of the shoe,
The ID tag according to claim 1. A fixed band fixed to the outside of the shoe, the fixed band contains the antenna;
The ID tag according to claim 2. The rechargeable battery is built in the insole, and the rechargeable battery and the antenna are connected by a removable power cable.
The ID tag according to claim 3. The rechargeable battery is built in the rear end of the insole,
The ID tag according to claim 4. The fixing band is removable from the shoe;
The ID tag according to any one of claims 3 to 5. The fixing band is formed of a shrinkable resin material.
The ID tag according to any one of claims 3 to 6.   A shoe comprising the ID tag according to any one of claims 1 to 7. The ID tag according to any one of claims 1 to 7,
An ID tag system comprising: a receiving device that receives the ID information wirelessly transmitted from the ID tag. An ID information transmission method for an ID tag provided on a shoe,
Holding ID information in advance;
Generating a current in response to pressure applied to the shoe during walking;
Charging with the generated current; and
Wirelessly transmitting ID information held in advance according to the charged power by an antenna provided outside the shoe. ID information transmitting method.

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