Article with RFID tag and fastening structure with RFID tag

Abstract

To provide an article with an RFID tag which is installed in a fixing structure using a fixing component such as a bolt, can suppress a decrease in communication distance of the RFID tag, and can be firmly fastened by a fastening component when the RFID tag is installed in a fastening structure using the fastening component among the fixing components.SOLUTION: An article 10 with an RFID tag includes a tag installation part 11 which is formed by using an insulating material and in which an RFID tag 5 is installed, and an attachment part 12 which is composed of a member having an insertion hole 12a and is integrated with or attached to the tag installation part 11. The attachment part 12 is attached to the fixing structure 1 using the fixing component 2 in a state where the shaft part 2a of the fixing component 2 is inserted into the insertion hole 12a.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to RFID (Radio Frequency Identification) and the like. [Background technology]

[0002] RFID is a general term for short-range communication that uses an induction electromagnetic field or radio waves to read and write data from semiconductor memory without contact. An RFID system using RFID consists of, for example, an RFID tag, a reader / writer, and a host device that controls them. An RFID tag is an IC chip with an antenna connected. A fixing part such as a bolt is used to install the RFID tag.

[0003] Patent Document 1 describes a bolt with an IC tag mounting structure. The bottle head of this bolt has a hole formed in the top surface to provide a storage compartment. This storage compartment houses an IC tag holder that holds an IC tag inside. The IC tag holder is composed of a plate-shaped magnetic body placed at the bottom, an IC tag placed on the magnetic body, and a ceramic covering member that covers and hardens the magnetic body and IC tag in a desired shape. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-238743 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the IC tag mounting structure described in Patent Document 1, the rigidity of the bolt head is reduced due to the hole formed in the bolt head, making it difficult to firmly tighten the bolt and achieve a strong connection.

[0006] Furthermore, when the bolt is made of metal, the distance between the metal surface of the bolt head and the RFID tag is relatively short. This means that the radio waves from the RFID tag are reflected by the metal surface, and the reflected waves may weaken the response waves to the reader / writer, resulting in a decrease in communication distance. If a plastic bolt is used to avoid this decrease in communication distance, it becomes even more difficult to secure the bolt firmly because the plastic bolt has lower rigidity than a metal bolt.

[0007] The present invention has been made in consideration of the above circumstances, and aims to provide an RFID-tagged item that is installed in a fixing structure using fixing parts such as bolts, and that can suppress a decrease in the communication distance of the RFID tag, and that can be firmly fastened by tightening parts when the RFID tag is installed in a fastening structure that uses fastening parts among the fixing parts. [Means for solving the problem]

[0008] In order to solve the above-mentioned problems, the first invention is an RFID-tagged article comprising a tag installation section formed using an insulating material and having an RFID tag installed thereon, and an attachment section composed of a member having an insertion hole and integrated with or attached to the tag installation section, in which the attachment section is attached to a fixing structure using the fixing part with the shaft of the fixing part inserted through the insertion hole.

[0009] In a second aspect of the present invention, in the first aspect, the tag installation section is formed in an annular shape, and the through-hole on the inside of the tag installation section overlaps with the insertion hole when viewed from the front of the tag installation section.

[0010] The third invention is the second invention, wherein the mounting portion has a plurality of claw portions that protrude inward from the edge of the insertion hole, and when the shaft portion is inserted through the insertion hole, the tips of the plurality of claw portions catch on or are pressed against the outer peripheral surface of the shaft portion, thereby attaching the mounting portion to the shaft portion.

[0011] In a fourth aspect of the present invention, in the third aspect, the attachment portion is integrated with the tag installation portion so that the plurality of claw portions protrude inward from the inner periphery of the tag installation portion.

[0012] The fifth invention is the fourth invention, in which the mounting portion has, in addition to the multiple claw portions, an annular connecting portion formed in a ring shape extending around the insertion hole and in which the base sides of the multiple claw portions are connected with a gap between them, and the tag installation portion has a first annular portion and a second annular portion overlapping each other, and the mounting portion is integrated with the tag installation portion by sandwiching the annular connecting portion between the first annular portion and the second annular portion.

[0013] A sixth aspect of the present invention is the fifth aspect of the present invention, wherein an annular recess for accommodating the annular connecting portion is formed on a surface of the first annular portion on which the second annular portion is superimposed.

[0014] The seventh invention is the sixth invention, wherein the second annular portion has an annular inner lid and an annular outer lid superimposed on the opposite side of the inner lid from the first annular portion, the RFID tag is formed in an annular or arc shape, and an annular space for accommodating the RFID tag is formed coaxially with the annular recess on the superimposed surface of the inner lid and the outer lid.

[0015] In an eighth aspect of the present invention, in the fifth aspect, the second annular portion has an annular inner lid and an annular outer lid superposed on the inner lid on the side opposite to the first annular portion, and the RFID tag is installed between the inner lid and the outer lid. Note that in the eighth aspect of the present invention, the inner lid and the outer lid may be joined so as to be openable and closable.

[0016] A ninth aspect of the present invention is the third or fourth aspect of the present invention, wherein the mounting portion is made of a metal.

[0017] A tenth aspect of the present invention is the third or fourth aspect of the present invention, wherein the mounting portion is made of a resin.

[0018] An eleventh aspect of the present invention is the tag-installing device according to the first aspect of the present invention, further comprising a wall-like portion that extends along the insertion direction of the insertion hole and connects the attachment portion and the tag installation portion.

[0019] The twelfth invention is the eleventh invention, which includes a resin part in which a tag installation portion and a resin wall portion that constitutes part or all of the wall portion are integrated, and a metal part that has an attachment portion and is attached to the resin part.

[0020] The thirteenth invention is the twelfth invention, in which the metal part further has a metal wall portion integrated with the mounting portion, and the metal wall portion is attached to the inside or outside of the resin wall portion, thereby forming a wall portion consisting of the resin wall portion and the metal wall portion.

[0021] The 14th invention is the 13th invention, in which the wall-like portion has a positioning structure that determines the mounting position of the metal wall-like portion relative to the resin wall-like portion so that the tip of the metal wall-like portion is located closer to the mounting portion than the tag installation portion.

[0022] A fifteenth aspect of the present invention is the eleventh aspect of the present invention, wherein the mounting portion, the wall-like portion, and the tag installation portion are integrated into a resin part.

[0023] In a sixteenth aspect of the present invention, based on the third aspect, the plurality of claw portions include claw portions having an anti-loosening structure at their tip portions.

[0024] In a seventeenth aspect of the present invention, in the first aspect of the present invention, the RFID tag is installed inside the tag installation section.

[0025] In an eighteenth aspect of the present invention, in the second aspect, the antenna of the RFID tag extends along the circumferential direction of the tag installation portion.

[0026] The 19th invention is a fastening structure comprising a fixing part having a shaft portion with a threaded groove formed on its outer surface, a fastened member having a through hole formed therein and the shaft portion inserted into the through hole, and a nut threaded onto the shaft portion inserted into the through hole of the fastened member from the tip side of the shaft portion, and the RFID tagged article of the fourth invention is a fastening structure with an RFID tag attached to the shaft portion closer to the tip side than the nut as a part to prevent the nut from loosening.

[0027] The 20th invention is a fastening structure with an RFID tag, which comprises a fixing part having a shaft with a thread groove formed on its outer surface, and a fastened member having a through hole formed therein and the shaft inserted into the through hole, and the RFID tagged article of the fourth invention is a part that serves as a nut and is attached from the tip side of the shaft inserted into the through hole of the fastened member.

[0028] The 21st invention is a fastening structure with an RFID tag, which comprises a fixing part having a shaft portion with a thread groove formed on its outer surface, and a fastened member having a through hole formed therein and having the shaft portion inserted through the through hole.The RFID tagged article of the 11th invention is a fastening structure with an RFID tag, in which if there is no head on one end of the shaft portion, the article is attached by clamping the attachment part between the fastened member and a nut threaded onto the shaft portion from one end side of the shaft, and if there is a head on one end of the shaft portion, the article is attached by clamping the attachment part between the head and the fastened member. [Effects of the Invention]

[0029] The present invention relates to an RFID-tagged article in which a tag installation section with an RFID tag installed is integrated with or attached to an attachment section having an insertion hole. The installation section is attached to a fixing structure using a fixing part (such as a fastening structure using a fastening part) with the shaft of the fixing part inserted into the insertion hole. In this invention, the RFID tag is not installed in the fixing structure as part of the fixing part having the shaft, but is installed in the RFID-tagged article as a part that can be attached to the fixing structure as a separate part from the fixing part. Therefore, when installing an RFID tag in a fastening structure using a fastening part among fixing parts, there is no need to process the fastening part for installing the RFID tag, and strong fastening in the fastening part is possible. Furthermore, in this invention, because the tag installation section is formed using an insulating material, a decrease in communication distance can be suppressed compared to when an RFID tag is installed on a metal bolt. According to the present invention, even if an RFID tag is installed in a fixing structure that uses fixing parts, it is possible to suppress a decrease in the communication distance of the RFID tag, and it is possible to realize an RFID-tagged article that can be firmly fastened with fastening parts even if the RFID tag is installed in a fastening structure within the fixing structure. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. 1 is a perspective view of an RFID tagged item according to the first embodiment. [Figure 2] FIG. 2A is an exploded perspective view of an RFID tagged article according to the first embodiment, and FIG. 2B is an exploded perspective view of an annular lid of the RFID tagged article according to the first embodiment. [Figure 3] Figure 3A is a cross-sectional view of a fastening structure with an RFID tag in which an RFID tagged item according to the first embodiment is used as a part for preventing a nut from loosening, and Figure 3B is a cross-sectional view of a fastening structure with an RFID tag different from that of Figure 3A. [Figure 4] FIG. 4 is a perspective view of the fastening structure with the RFID tag of FIG. 3A. [Figure 5] FIG. 5 is a cross-sectional view of a fastening structure with an RFID tag in which the RFID tagged article according to the first embodiment is used as a part in place of the nut 4. As shown in FIG. [Figure 6] FIG. 6 is a cross-sectional view of an RFID tagged item according to a first modified example of the first embodiment. [Figure 7] FIG. 7A is a perspective view of an attachment portion of an RFID tagged article according to a second modified example of the first embodiment, and FIG. 7B is a cross-sectional view of the RFID tagged article according to the second modified example of the first embodiment. [Figure 8] FIG. 8 is a rear view of an RFID tagged item according to a third modified example of the first embodiment. [Figure 9] Figure 9A is an oblique view of an RFID tagged item according to the second embodiment, viewed from the tag installation section side; Figure 9B is an oblique view of the RFID tagged item of Figure 9A, viewed from the attachment section side; and Figure 9C is an oblique view of an RFID tagged item of a different form from that of Figure 9A, viewed from the tag installation section side. [Figure 10] 10A is an exploded perspective view of the RFID-tagged article of FIG. 9A, and FIG. 10B is a cross-sectional view of the RFID-tagged article of FIG. 9A. [Figure 11] Figure 11A is a cross-sectional view of an RFID tag-equipped fastening structure according to the second embodiment, in which an RFID tag-equipped item is attached using a nut, and Figure 11B is a cross-sectional view of an RFID tag-equipped item is attached using the head of a bolt. [Figure 12] FIG. 12 is a perspective view of the fastening structure with an RFID tag of FIG. 11A as viewed from the front side. [Figure 13] FIG. 13 is a cross-sectional view showing how a nut is tightened with a tool in the fastening structure with an RFID tag of FIG. 11A. [Figure 14] FIG. 14A is an oblique view of an RFID tagged item according to a first modified example of the second embodiment, viewed from the tag installation section side, and FIG. 14B is an oblique view of the RFID tagged item of FIG. 14A, viewed from the attachment section side. [Figure 15] FIG. 15 is a cross-sectional view of a fastening structure with an RFID tag according to a first modified example of the second embodiment. [Figure 16]Figure 16A is a cross-sectional view of a fastening structure with an RFID tag provided with an RFID tagged item according to a second variant of the second embodiment, and Figure 16B is a cross-sectional view of a fastening structure with an RFID tag provided with an RFID tagged item according to a third variant of the second embodiment. [Figure 17] Figure 17A is an oblique view of a metal part of an RFID tagged item according to a fourth variant of the second embodiment, viewed from the side opposite the mounting portion, and Figure 17B is an oblique view of the claw portion of the mounting portion in Figure 17A, viewed from the center side of the insertion hole. DETAILED DESCRIPTION OF THE INVENTION

[0031] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the following embodiments and modifications are merely examples of the present invention and are not intended to limit the scope of the present invention, its applications, or its uses.

[0032] In this embodiment, an RFID tagged item 10 (hereinafter sometimes referred to as a "tagged item") is attached directly or indirectly to a shaft 2a of a fixing part 2 (bolt, threaded rod, pin, etc.) and is installed in a fixing structure 1 that uses the fixing part 2. The fixing part 2 includes a fastening part (bolt, nut, etc.) and a part that is not tightened when fixed (pin, etc.).

[0033] The tagged item 10 includes a tag installation section 11 formed using an insulating material and having an RFID tag 5 installed thereon, and an attachment section 12 formed of a member having an insertion hole 12a and integrated with or attached to the tag installation section 11. The attachment section 12 is attached to a fixing structure 1 used for the fixing part 2 with the shaft section 2a of the fixing part 2 inserted through the insertion hole 12a.

[0034] First Embodiment In this embodiment, the tag installation section 11 is formed in an annular shape, and when viewed from the front of the tag installation section 11, the through hole on the inside of the tag installation section 11 overlaps with the insertion hole 12a. The attachment section 12 has multiple claw portions 15 that protrude inward from the edge of the insertion hole 12a. When the shaft section 2a is inserted through the insertion hole 12a, the tips of the multiple claw portions 15 catch on or are pressed against the outer peripheral surface of the shaft section 2a, thereby attaching the attachment section 12 to the shaft section 2a. The tagged article 10 is attached to the shaft section 2a of the fixing part 2 by the multiple claw portions 15. In this embodiment, the attachment section 12 is integrated with the tag installation section 11 so that the multiple claw portions 15 protrude inward from the inner peripheral side of the tag installation section 11.

[0035] As shown in Fig. 1, the tagged item 10 includes a tag installation section 11 on which an RFID tag (IC tag) 5 is installed, and an attachment section 12 integrated with the tag installation section 11. The tag installation section 11 is formed in a circular ring shape using an insulating material. In this embodiment, the RFID tag 5 is installed inside the tag installation section 11.

[0036] The mounting portion 12 is made of a metal material such as stainless steel, aluminum, or iron. A commercially available product (product name: nut locking ring) can be used for the mounting portion 12. As shown in FIGS. 1 and 2A, the mounting portion 12 has a plurality of claw portions 15 (six claw portions 15 in this embodiment) protruding inward from the inner periphery of the tag installation portion 11, as well as an annular connecting portion 16 formed in a ring shape extending around the insertion hole 12a, with the base sides of the plurality of claw portions 15 connected at intervals in the circumferential direction. The number of claw portions 15 in the mounting portion 12 may be two or more, and three or more is preferable.

[0037] As shown in FIG. 2A, the annular connecting portion 16 has a shape that bulges outward as a whole. In this specification, the bulging side of the annular connecting portion 16 is referred to as the "front side" and the opposite side as the "rear side" (see FIG. 3). The annular connecting portion 16 has an inner peripheral portion (surface portion) 16a to which the plurality of claw portions 15 are connected, and an outer peripheral portion (side surface portion) 16b that is continuous with the outside of the inner peripheral portion 16a. Both the inner peripheral portion 16a and the outer peripheral portion 16b are formed of annular plate material. In a cross-sectional view, the outer peripheral portion 16b extends obliquely inward from its outer end. The inner peripheral portion 16a extends obliquely inward from its outer end (the inner end of the outer peripheral portion 16b) at a smaller angle than the outer peripheral portion 16b.

[0038] The plurality of claws 15 are provided at equal angular intervals in the circumferential direction on the inner circumference of the inner circumferential portion 16a. In the mounting portion 12, the plurality of claws 15 have substantially the same shape and size. Each claw 15 is formed in a tapered, substantially isosceles trapezoidal plate shape and functions as a leaf spring. The tip of each claw 15 extends linearly in the width direction. In cross-sectional view, each claw 15 protrudes obliquely toward the front side (see FIG. 3A). Each claw 15 bends toward the front side at its base and extends obliquely from its base at a larger angle than the inner circumferential portion 16a. The angles of the claws 15 in cross-sectional view may be the same among the plurality of claws 15 or may be different among the plurality of claws 15. In the latter case, the angles of the claws 15 may be different so that the tips of the plurality of claws 15 are aligned with the helix of the male thread of the shaft portion 2a.

[0039] The tag installation section 11 has an annular bottom section 21 and an annular lid section 22 that are stacked and integrated with each other (see FIG. 2A). The annular bottom section 21 corresponds to the "first annular section," and the annular lid section 22 corresponds to the "second annular section."

[0040] The annular bottom portion 21 and the annular lid portion 22 are both formed in the shape of an annular plate. The annular bottom portion 21 and the annular lid portion 22 have the same outer diameter and inner diameter. The annular bottom portion 21 and the annular lid portion 22 are arranged coaxially with each other. For example, the annular bottom portion 21 has a greater thickness than the annular lid portion 22.

[0041] The annular bottom portion 21 is manufactured by, for example, resin molding (such as molding using a hard resin). A circular annular recess 17 is formed on the surface (surface) of the annular bottom portion 21 on which the annular lid portion 22 is superimposed, and the circular annular recess 17 accommodates the outer peripheral portion 16b of the annular connecting portion 16. The annular recess 17 is a groove whose width and depth are constant in the circumferential direction. The annular recess 17 is formed coaxially with the annular bottom portion 21. The thickness of the annular bottom portion 21 is constant except for the area where the annular recess 17 is formed.

[0042] The annular lid portion 22 includes an annular inner lid 22a, an annular outer lid 22b that is superimposed on the inner lid 22a on the side opposite the annular bottom portion 21 and integrated with the inner lid 22a, and an RFID tag 5 that is sandwiched between the inner lid 22a and the outer lid 22b (see FIG. 2B). The inner lid 22a and the outer lid 22b are manufactured by, for example, resin molding (such as molding using a hard resin). The inner lid 22a and the outer lid 22b have the same outer shape and inner diameter. The inner lid 22a and the outer lid 22b are arranged coaxially with each other.

[0043] The RFID tag 5 is a sheet- or film-shaped RFID inlay. The RFID tag 5 is formed in a ring or arc shape. The RFID tag 5 includes an IC chip (IC module) 5a, an antenna 5b capable of communicating with the IC chip 5a, and a base material 5c on which the IC chip 5a and the antenna 5b are mounted (see FIG. 2B).

[0044] The base material 5c is formed in a sheet or film shape. The base material 5c may be made of an insulating film such as a plastic film. In this embodiment, the base material 5c is formed in a ring shape (for example, a circular ring shape).

[0045] The antenna 5b extends in an arc shape along the circumferential direction of the substrate 5c (tag installation section 11). The antenna 5b is provided parallel to the bottom surface of the tag installation section 11. The antenna 5b is a loop antenna or a dipole antenna. When the antenna 5b is a dipole antenna, an antenna with a meander line bent into an arc shape (see FIG. 2B) can be used. The antenna 5b can be formed, for example, by etching a metal foil laminated on the substrate 5c, or by printing a conductive ink on the substrate 5c.

[0046] The RFID tag 5 is placed between the inner lid 22a and the outer lid 22b. An annular space 18 for accommodating the RFID tag 5 is formed at the overlapping surface of the inner lid 22a and the outer lid 22b. In this embodiment, the annular space 18 is configured as an annular groove formed in the surface (surface) of the inner lid 22a on which the outer lid 22b is overlapped. The annular space 18 is formed coaxially with the inner lid 22a. Note that the annular space 18 may also be formed in the outer lid 22b.

[0047] A method for manufacturing the tagged article 10 will now be described. In this manufacturing method, the inner lid 22a and the outer lid 22b are coaxially overlapped with each other and joined by a joining means such as welding or adhesive, with the RFID tag 5 accommodated in the annular space 18. This completes the annular lid portion 22. The RFID tag 5 is installed inside the annular lid portion 22.

[0048] Then, with the outer periphery 16b of the annular connecting portion 16 of the mounting portion 12 housed in the annular recess 17, the annular bottom portion 21 and the annular lid portion 22 are coaxially overlapped with each other and joined by a joining means such as welding or adhesive. This completes the tagged item 10. With the annular connecting portion 16 sandwiched between the annular bottom portion 21 and the annular lid portion 22, the mounting portion 12 is integrated into the tag installation portion 11 to which the annular bottom portion 21 and the annular lid portion 22 are joined. The annular bottom portion 21 serves as a container that houses the annular connecting portion 16 of the mounting portion 12, and the annular lid portion 22 serves as a lid that closes the annular recess 17.

[0049] In the manufacturing process of the tagged article 10, the attachment part 12 is positioned by the annular recess 17. The annular connecting part 16 of the attachment part 12 is arranged coaxially with the annular recess 17. For example, as shown in FIG. 3 , the dimensions of the annular connecting part 16 and the annular recess 17 are set so that the upper end of the outer circumferential part 16b of the annular connecting part 16 abuts against the inner circumferential side wall of the annular recess 17, thereby enabling the annular connecting part 16 to be positioned with high precision.

[0050] The RFID tag 5 and antenna 5b are also positioned by the annular space 18. In the tagged article 10, the annular recess 17 and the annular space 18 are coaxially arranged, and therefore the antenna 5b is positioned coaxially with the annular connecting portion 16. By positioning the RFID tag 5 in this manner, the distance between the RFID tag 5 and the metal body (the mounting portion 12 and the shaft portion 2a) becomes constant, making it possible to control variations in the communication distance. Furthermore, in this embodiment, the dimensions of the antenna 5b and the annular connecting portion 16 are set so that the formation area of ​​the antenna 5b does not overlap with the annular connecting portion 16 when the tagged article 10 is viewed in the thickness direction (axial direction) of the tag installation portion 11.

[0051] [Fastening structure with RFID tag] The tagged article 10 is used as a component for preventing a nut from loosening. Figures 3 and 4 show a fastening structure 1 with an RFID tag (hereinafter, may be referred to as "this fastening structure") that uses the tagged article 10 as a component for preventing a nut from loosening. This fastening structure 1 includes the tagged article 10, a fixing component (fastening component) 2 having a shaft portion 2a with a thread groove formed on its outer circumferential surface, a fastened member 3 having a through hole 3a formed therein and provided with the shaft portion 2a inserted into the through hole 3a, and a nut 4 that is screwed onto the shaft portion 2a inserted into the through hole 3a of the fastened member 3, from the tip side of the shaft portion 2a.

[0052] The fixing part 2 has a shaft portion 2a and a shaft fixing portion 2b to which the base of the shaft portion 2a is fixed. In Figures 3A and 4, the fixing part 2 is a bolt, and the shaft fixing portion 2b is the head of the bolt. The fastened member 3 is sandwiched between the shaft fixing portion 2b and the nut 4. In this state, the tagged article 10 is attached to the shaft portion 2a, closer to the tip than the nut 4. During this attachment, the tagged article 10 is rotated to thread the tips of the multiple claws 15 into the male threads on the outer circumferential surface of the shaft portion 2a, thereby inserting the shaft portion 2a into the insertion hole (through hole) 12a on the inside of the tag installation portion 11, and the tagged article 10 is attached in such a way that the tips of the claws 15 are caught on the threads of the shaft portion 2a. The tagged article 10 is pressed against the nut 4. The tagged article 10 may also be attached to the shaft portion 2a by pushing it axially onto the shaft portion 2a.

[0053] In the fastening structure 1 shown in FIG. 3A, the back side (the nut 4 side) of the through-hole 25 in the annular bottom portion 21 may be made larger than the outer shape of the nut 4, so that a portion of the tagged article 10 is embedded in the nut 4 in a cross-sectional view (see FIG. 3B). In this case, the hole shape of the back side of the through-hole 25 may be a hexagonal shape similar to the shape of the nut 4, or may be circular so that the wall surface of the hole forms a circumscribed circle of the nut 4. In FIG. 3B, a hexagonal through-hole corresponding to the outer shape of the nut 4 is formed from the front surface to the back surface of the annular bottom portion 21, and the nut 4 abuts against the claw portions 15. As a result, for example, when the fastened member 3 is thick, the tagged article 10 can be attached to the shank 2a without lengthening the shank 2a (such as a bolt shank). Furthermore, if an excess portion is generated at the tip of the shank 2a to which the tagged article 10 is attached, the excess portion can be shortened.

[0054] The tagged article 10 may be used as a component (simple nut) in place of the nut 4. FIG. 5 shows a fastening structure 1 with an RFID tag that uses the tagged article 10 as a component in place of the nut 4. In this case, the fastening structure 1 with an RFID tag includes the tagged article 10, a fixing part 2 having a shank 2a with a thread groove formed on its outer circumferential surface, and a fastened member 3 having a through hole 3a formed therein and inserted into the through hole 3a. The tagged article 10 is attached to the shank 2a inserted into the through hole 3a of the fastened member 3 from the tip side of the shank 2a. In this case, if the fastened member 3 is made of metal, the thickness of the annular bottom 21 may be made thicker than that of the fastening structure 1 shown in FIGS. 3A and 4 in order to distance the fastened member 3 from the RFID tag 5.

[0055] 3A and 4, the fastening structure 1 shown in FIG. 3B, and the fastening structure 1 shown in FIG. 5, the fixing part 2 may be a threaded rod consisting of only the shank 2a. In this case, one end of the shank 2a is joined to a member that, together with the nut 4, sandwiches the fastened part 3. Alternatively, multiple fastened parts 3 may be provided so that the multiple fastened parts 3 are sandwiched between the shank fixing part 2b and the nut 4. Alternatively, the shank 2a of the fastening part (bolt 2) in the fastening structure 1 may be used as a rotation axis.

[0056] [Effects of this embodiment] In this embodiment, there is no need to process the fastening component to install the RFID tag 5, and strong fastening is possible with the tightening component 2. Furthermore, because the tag installation portion 11 where the RFID tag 5 is installed is made of an insulating material, it is possible to suppress a decrease in communication distance compared to when an RFID tag is installed on a metal bolt.

[0057] Furthermore, because the RFID tag 5 is sealed inside the tag installation portion 11, the RFID tag 5 does not come into direct contact with the metal parts of the fastening structure 1. Furthermore, the RFID tag 5 is separated from the nut 4 in the axial direction of the shaft portion 2a by the thickness of the annular bottom portion 21 and the thickness of the bottom of the groove of the annular space 18 in the inner lid 22a, and the formation area of ​​the antenna 5b of the RFID tag 5 does not overlap with the outer circumferential portion 16b of the metal mounting portion 12 when the tagged item 10 is viewed in the thickness direction of the tag installation portion 11. Therefore, a decrease in communication distance due to the metal parts of the fastening structure 1 can be significantly suppressed.

[0058] Furthermore, when it becomes necessary to replace the RFID tag 5, in the IC tag mounting structure described in Patent Document 1, it is necessary to remove the bolt containing the RFID tag 5 and replace the bolt, but in this embodiment, the RFID tag 5 can be replaced by replacing the tagged item 10 while maintaining the fastening by the fastening parts.

[0059] [First Modification of the First Embodiment] In this modification, the inner lid 22a and the outer lid 22b are joined so as to be able to open and close by fitting a convex portion 31 provided on one of the inner lid 22a and the outer lid 22b into a concave portion 32 provided on the other. In the tagged article 10 shown in Fig. 6, the concave portion 32 is formed on the surface of the inner lid 22a, and the convex portion 31 is formed on the back surface of the outer lid 22b. In this modification, the RFID tag 5 can be replaced by removing the outer lid 22b from the inner lid 22a.

[0060] Alternatively, a convex portion 31 may be formed on the surface of the inner lid 22a, and a concave portion 32 may be formed on the back surface of the outer lid 22b. Alternatively, the depth of the groove in the annular space 18 may be made greater than the thickness of the RFID tag 5, and the convex portion 31 that fits into the annular space 18 in which the RFID tag 5 is installed may be provided on the outer lid 22b.

[0061] [Second Modification of the First Embodiment] In this modification, the attachment portion 12 shown in FIG. 7A is used in the tagged article 10. A commercially available product (product name: Round Speed ​​Nut (registered trademark)) can be used for the attachment portion 12. The attachment portion 12 has a plurality of claw portions 15 (four claw portions 15 in this modification) that protrude inward from the inner periphery of the tag installation portion 11, and an annular connecting portion 16 in which the base ends of the plurality of claw portions 15 are connected with a gap between them. The annular connecting portion 16 is formed in the shape of a flat annular plate. On the surface of the annular bottom portion 21, as shown in FIG. 7B, an annular recess 17 that accommodates the annular connecting portion 16 is formed from the inner periphery of the annular bottom portion 21.

[0062] The mounting portion 12 is not limited to the above-described embodiment and this modified example. For example, the outer circumferential shape or the inner circumferential shape of the mounting portion 12 may be polygonal.

[0063] [Third Modification of the First Embodiment] In this modification, the inner peripheral shape of the tag installation section 11 is hexagonal, as shown in Fig. 8. The through-hole inside the tag installation section 11 is formed to a size that allows the nut 4 to be fitted into it. Therefore, when the tagged item 10 is used as a part for preventing the nut from loosening, the effect of preventing loosening can be improved.

[0064] Second Embodiment In this embodiment, the tagged article 10 includes, in addition to the tag installation section 11 and the attachment section 12, a wall-like section 13 that extends along the insertion direction of the insertion hole 12a of the attachment section 12 (thickness direction of the attachment section 12) and connects the attachment section 12 and the tag installation section 11. The tag installation section 11 and the attachment section 12 are arranged apart from each other in the insertion direction of the insertion hole 12a. The wall-like section 13 extends along the axial direction of the shaft section 2a of the fixing part 2 and is provided so as to surround the shaft section 2a in an attached state in which the attachment section 12 is attached to a fixing structure 1 (such as the fastening structure 1 shown in FIG. 11A) that uses the fixing part 2. In this embodiment, the tag installation section 11 is also formed in an annular shape, and the through hole on the inside of the tag installation section 11 overlaps with the insertion hole 12a when viewed from the front of the tag installation section 11.

[0065] 9A and 9B, the tagged item 10 comprises a resin part 41 having a tag installation portion 11, and a metal part 42 having an attachment portion 12 and attached to the resin part 41. In addition to the tag installation portion 11, the resin part 41 further comprises a resin wall portion 43 that forms part of the wall portion 13, and the resin wall portion 43 is integrated with the tag installation portion 11. In addition to the attachment portion 12, the metal part 42 further comprises a metal wall portion 44 that forms part of the wall portion 13, and the metal wall portion 44 is integrated with the attachment portion 12.

[0066] In the tagged article 10, the metal wall portion 44 is attached to the inside of the resin wall portion 43, thereby forming the wall portion 13 consisting of the resin wall portion 43 and the metal wall portion 44. The metal wall portion 44 may also be attached to the outside of the resin wall portion 43. In this case as well, the wall portion 13 consisting of the resin wall portion 43 and the metal wall portion 44 is formed.

[0067] 10, the resin part 41 is a part formed in a generally cylindrical shape as a whole. In the resin part 41, the tag installation section 11 is formed in an annular shape, and the resin wall section 43 is formed in a generally cylindrical shape. In the height direction (axial direction) of the resin wall section 43, the side of the tag installation section 11 is referred to as the "one end side," and the opposite side is referred to as the "other end side."

[0068] 2B is embedded in the tag installation portion 11. The RFID tag 5 is arranged coaxially with the tag installation portion 11 and the insertion hole 12a of the mounting portion 12. For example, the resin part 41 is formed by insert molding with the RFID tag 5 as an insert part.

[0069] 9C, the tag installation section 11 may be divided into an annular bottom section 21 and an annular lid section 22. The annular bottom section 21 corresponds to the "first annular section," and the annular lid section 22 corresponds to the "second annular section." The annular bottom section 21 and the annular lid section 22 are overlapped with each other to form an integrated unit. The RFID tag 5 is disposed between the annular bottom section 21 and the annular lid section 22. In this case, an annular space for accommodating the RFID tag 5 may be formed coaxially with the insertion hole 12a of the installation section 12 at the overlapping surface of the annular bottom section 21 and the annular lid section 22. In this embodiment, the dimensions of the antenna 5b, the tag installation section 11, and the installation section 12 are set so that the formation area of ​​the antenna 5b does not overlap with the installation section 12 when the tagged article 10 is viewed in the thickness direction (axial direction) of the tag installation section 11. The annular bottom portion 21 and the annular lid portion 22 may be joined openably and closably using a concave-convex structure, similar to the inner lid 22a and the outer lid 22b of the first modified example of the first embodiment.

[0070] 10A, the resin wall portion 43 includes a cylindrical tubular portion 45, a plurality of outer protrusions (outer ribs) 46 protruding from the outer peripheral surface of the tubular portion 45, and a plurality of inner protrusions (inner ribs) 47 protruding from the inner peripheral surface of the tubular portion 45. The tubular portion 45 is formed coaxially with the tag installation portion 11.

[0071] Each of the multiple outer protrusions 46 extends straight in the height direction of the cylindrical portion 45. The multiple outer protrusions 46 are arranged at equal angular intervals in the circumferential direction of the cylindrical portion 45. Each of the multiple inner protrusions 47 extends straight in the height direction of the cylindrical portion 45. The multiple inner protrusions 47 are arranged at equal angular intervals in the circumferential direction of the cylindrical portion 45. In this embodiment, the outer protrusions 46 are arranged at smaller angular intervals than the inner protrusions 47. The outer protrusions 46 are also formed at the angular positions where the inner protrusions 47 are formed.

[0072] The outer protrusion 46 and the inner protrusion 47 are formed across the height of the cylindrical portion 45. One end of the outer protrusion 46 and one end of the inner protrusion 47 are connected to the tag installation portion 11, respectively.

[0073] The cylindrical portion 45 has a constant thickness throughout the main section, excluding the other end. The thickness (wall thickness) of the cylindrical portion 45 is smaller than the thickness (distance between the outer and inner peripheral surfaces) of the tag installation section 11. The other end of the cylindrical portion 45 has an obliquely chamfered inner surface (e.g., C-chamfered). The inner diameter of one end of the cylindrical portion 45 is larger than the inner diameter of the other end of the tag installation section 11. At the boundary between the tag installation section 11 and the cylindrical portion 45, a stepped surface 50 is formed, extending from the inner peripheral surface of the tag installation section 11 to the inner peripheral surface of the cylindrical portion 45. The width of the stepped surface 50 is equal to the protruding height of the inner protrusion 47. On the inner peripheral surface of the main section of the cylindrical portion 45, mounting protrusions 48 are provided in each region between the inner protrusions 47.

[0074] The outer diameter of one end of the cylindrical portion 45 is smaller than the outer diameter of the other end of the tag installation portion 11. At the boundary between the tag installation portion 11 and the cylindrical portion 45, a step surface 51 is formed that extends from the outer peripheral surface of the tag installation portion 11 to the outer peripheral surface of the cylindrical portion 45. The width of the step surface 51 is equal to the protruding height of the outer protrusion 46.

[0075] The metal part 42 is a bottomed part in which the mounting part 12, which has a circular outer periphery in front view, serves as the bottom, and a metal wall part 44 rises from the outer periphery of the mounting part 12. In the metal part 42, the mounting part 12 is formed in the shape of an annular plate, and the metal wall part 44 is formed in a substantially cylindrical shape. Note that the tip side of the metal wall part 44 in the height direction (axial direction) of the metal wall part 44 is referred to as the "one end side," and the side facing the mounting part 12 is referred to as the "other end side."

[0076] A circular insertion hole 12a is formed in the center of the mounting part 12 as a through-hole of the mounting part 12. The diameter of the insertion hole 12a is slightly larger than the outer diameter of the shaft part 2a of the fixing part 2. The insertion hole 12a is provided for attaching the mounting part 12 to the fixing structure 1 that uses the fixing part 2.

[0077] The metal wall portion 44 is formed coaxially with the mounting portion 12 and the insertion hole 12a. The other end of the metal wall portion 44 is connected to the outer periphery of the mounting portion 12. The outer diameter of the metal wall portion 44 is approximately equal to the inner diameter of the tubular portion 45. Therefore, the metal wall portion 44 can be fitted inside the tubular portion 45 of the resin wall portion 43.

[0078] The metal wall portion 44 has a plurality of notches 57 extending from one end. The plurality of notches 57 are arranged at equal angular intervals in the circumferential direction of the metal wall portion 44. The angular intervals at which the notches 57 are arranged are equal to the angular intervals at which the inner protrusions 47 are arranged. The number of notches 57 is the same as the number of inner protrusions 47. The notches 57 extend from one end to the other end of the metal wall portion 44. One end side of the notches 57 is chamfered (such as a rounded chamfer) to widen toward the inlet side. Furthermore, the metal wall portion 44 has mounting holes 49 formed at positions corresponding to the mounting protrusions 48.

[0079] In this embodiment, the metal wall portion 44 is fitted inside the resin wall portion 43, thereby attaching the metal part 42 to the resin part 41, thereby completing the tagged article 10 shown in FIG. 10B.

[0080] When attaching the metal part 42 to the resin part 41, the cutout 57 is aligned with the inner protrusion 47, and the metal wall part 44 is inserted into the resin wall part 43 from the other end side of the resin wall part 43. The metal wall part 44 is inserted into the resin wall part 43 while the inner protrusion 47 is guided by the cutout 57.

[0081] Here, the wall portion 13 has a positioning structure that determines the attachment position of the metal wall portion 44 relative to the resin wall portion 43 so that the tip of the metal wall portion 44 is located closer to the attachment portion 12 than the tag installation portion 11 in the insertion direction of the insertion hole 12a. Specifically, the metal wall portion 44 is inserted into the resin wall portion 43 until the tip of the metal wall portion 44 abuts against the step surface 50. The attachment position of the metal wall portion 44 relative to the resin wall portion 43 is the position where the tip of the metal wall portion 44 abuts against the step surface 50. This attachment position is determined by the step surface 50. The step surface 50 constitutes the positioning structure described above.

[0082] The above-mentioned mounting position may be a position where the inner protrusion 47 cannot be pushed into the notch 57 (in this embodiment, a position where the inner protrusion 47 reaches the other end (the portion where the width narrows) of the notch 57). In this case, the inner protrusion 47 and the notch 57 constitute the above-mentioned positioning structure.

[0083] In addition, in the above-described mounting position, the mounting protrusions 48 of the resin wall portion 43 fit into the mounting holes 49 of the metal wall portion 44. This prevents the metal part 42 from unintentionally coming off the resin part 41.

[0084] [Fastening structure with RFID tag] The tagged article 10 is placed in a fastening structure 1 that uses fastening parts 2. The procedure for attaching the tagged article 10 to the fastening structure that uses fastening parts 2 will now be described.

[0085] Before the tagged article 10 is attached, the shank 2a of the fastening part 2 is inserted into the through-hole 3a of the fastened member 3, and the fastening part 2 is attached to the fastened member 3, so that the shank 2a protrudes from the fastened member 3 (see FIG. 11A). In this state, the tagged article 10 is positioned so that the shank 2a of the fastening part 2 is inserted into the insertion hole 12a. Then, from this state, the nut 4 is screwed onto the shank 2a. The nut 4 is tightened until the attachment part 12 is sandwiched between the nut 4 and the fastened member 3.

[0086] 11A and 12 show a fastening structure 1 with an RFID tag (hereinafter, sometimes referred to as "the fastening structure") to which a tagged article 10 is attached. The fastening structure 1 includes a fixing part (fastening part) 2 having a shaft 2a with a thread groove (external thread) formed on its outer circumferential surface, a fastened member 3 having a through hole 3a formed therein with the shaft 2a inserted through the through hole 3a, and a nut 4 threaded onto the shaft 2a. In the fastening structure 1, the head 2b is not present on one end side (the right side in FIG. 11A) of the shaft 2a, and the attachment part 12 is attached to the fastening structure 1 by being sandwiched between the nut 4 and the fastened member 3. In the fastening structure 1, the RFID tag 5 encapsulated in the resin part 41 is not in contact with metal bodies such as the metal part 42, the fastening part 2, and the nut 4, and is separated from the metal bodies.

[0087] The fastening part 2 may be a bolt having a head 2b on one end side of the shaft 2a (the right side in Fig. 11B). In this case, the tagged article 10 is attached to the fastening structure 1 by clamping the attachment part 12 between the head 2b of the fastening part 2 and the fastened member 3, as shown in Fig. 11B.

[0088] [Effects of this embodiment] In this embodiment, there is no need to process the fastening component to install the RFID tag 5, and strong fastening in the tightening component 2 is possible. Furthermore, the tag installation section 11 on which the RFID tag 5 is installed is formed using an insulating material. Furthermore, in an installed state in which the mounting section 12 is attached to the fixing structure 1, the tag installation section 11 on which the RFID tag 5 is installed surrounds the shaft portion 2a in a front view of the tag installation section 11, so it is possible to space the RFID tag 5 to a certain extent away from the shaft portion 2a of the fixing component 2. Therefore, it is possible to suppress a decrease in communication distance compared to when the RFID tag 5 is installed on a metal bolt.

[0089] In this embodiment, since the mounting portion 12 is made of metal, when the mounting portion 12 is attached to the fixing part 2, the mounting portion 12 is unlikely to be damaged even if it is firmly clamped between the nut 4 and the fastened member 3, and it is possible to firmly fasten the nut 4. The mounting portion 12 can also be made highly durable.

[0090] In this embodiment, the mounting portion 12 and the tag installation portion 11 are connected by a wall-like portion 13 extending in the axial direction of the shaft portion 2a of the fixing part 2. Therefore, the RFID tag 5 can be spaced apart from the metal mounting portion 12, which is parallel to the RFID tag 5, by the height of the wall-like portion 13.

[0091] In this embodiment, the positioning structure of the wall portion 13 determines the attachment position of the metal wall portion 44 relative to the resin wall portion 43 so that the tip of the metal wall portion 44 is located closer to the attachment portion 22 than the tag installation portion 11. Therefore, the effect of the metal body on the communication performance of the RFID tag 5 is constant, and the communication quality of the tagged item 10 can be stabilized.

[0092] In this embodiment, the widths of the inner protrusion 47 and the cutout 57 are approximately equal, and the inner protrusion 47 is fitted into the cutout 57. Therefore, after assembling the tagged article 10, the position of the metal wall portion 44 does not shift relative to the RFID tag 5 inside the resin wall portion 43, thereby stabilizing the communication quality of the tagged article 10.

[0093] In this embodiment, in the fastening structure 1, as shown in Fig. 13, a tool (wrench socket) 6 for tightening the nut 4 can be inserted into the gap between the inner peripheral surface of the wall-like portion 13 and the outer peripheral surface of the nut 4. The inner peripheral surface of the wall-like portion 13 is formed larger than the nut 4 (or the head 2b of the bolt 2). Therefore, in the mounted state in which the tagged article 10 is attached to the fixing structure 1, the nut 4 can be tightened with the tool.

[0094] [First Modification of Second Embodiment] In this modified example, the tagged article 10 is made up of a resin part that integrates the mounting part 12, the wall part 13, and the tag installation part 11. As shown in Figures 14A and 14B, the tagged article 10 is a bottomed part in which the mounting part 12 is the bottom and the approximately cylindrical wall part 13 rises from the outer periphery of the approximately annular mounting part 12.

[0095] The wall portion 13 includes a cylindrical tubular portion 45 and a plurality of outer protrusions (outer ribs) 46 protruding from the outer peripheral surface of the tubular portion 45. Each of the outer protrusions 46 extends straight in the height direction of the tubular portion 45. The outer protrusions 46 are arranged at equal angular intervals in the circumferential direction of the tubular portion 45. In addition, an annular tag installation portion 11 is provided at the tip of the wall portion 13. The tag installation portion 11 is formed coaxially with the insertion hole 12a of the attachment portion 12.

[0096] In the fastening structure 1 having the tagged article 10 according to this modified example, as shown in Fig. 15, the resin mounting part 12 is attached to the fixing structure 1 by being sandwiched between the nut 4 that is screwed onto the head 2b or shaft 2a of the fixing part 2 and the fastened member 3. According to this modified example, the tagged article 10 can be constructed without including any metal parts, so that a decrease in communication distance can be significantly suppressed. The tagged article 10 can be integrally molded as a resin molded product, so that the tagged article 10 can be easily manufactured.

[0097] [Second Modification of the Second Embodiment] In this modified example, the height of the tagged article 10 is increased compared to the second embodiment described above, as shown in FIG. 16A. Specifically, the wall-like portion 13 is higher than in the second embodiment described above. According to this modified example, although the tagged article 10 is not as compact as in the second embodiment described above, the RFID tag 5 can be spaced away from the metal body, and a decrease in communication distance can be further suppressed. The tagged article 10 can be used in cases where there are no other members near the through hole 3a of the fastened member 3.

[0098] [Third Modification of Second Embodiment] In this modified example, the height of the tagged article 10 is reduced compared to the second embodiment described above, as shown in FIG. 16B. Specifically, the wall-like portion 13 is lower compared to the second embodiment described above. According to this modified example, the tagged article 10 can be made more compact than the second embodiment described above, and the protrusion length of the tagged article 10 from the fastened member 3 can be reduced. The tagged article 10 according to this modified example can be used in cases where there is another member near the through hole 3a of the fastened member 3.

[0099] [Fourth Modification of the Second Embodiment] In this modified example, the attachment part 12 has a plurality of claw parts 15 that protrude inward from the edge of the insertion hole 12a. In the tagged article 10 according to this modified example, the attachment part 12 is attached to the shaft part 2a by the tips of the plurality of claw parts 15 being caught on or pressed against the outer circumferential surface of the shaft part 2a.

[0100] In this modified example, as shown in FIGS. 17A and 17B, a loosening prevention structure 15a may be provided at the tip of each claw portion 15. Each claw portion 15 has a corner on the first rotation direction side (clockwise side in FIG. 17A) and the second rotation direction side in the circumferential direction of the insertion hole 12a. The loosening prevention structure 15a is formed by bending the tip of the claw portion 15 so that the corner on the first rotation direction side protrudes in the thickness direction of the attachment portion 12. When multiple claw portions 15 are screwed onto male threads on the outer peripheral surface of the shank 2a of the fastening part 2 to attach the tagged article 10 to the fastening part 2, the corner on the first rotation direction side of each claw portion 15 bites into the slope of the thread of the male thread. This makes it difficult for the attachment portion 12 to loosen from the shank 2a, and the tagged article 10 can be firmly fixed to the shank 2a. The anti-loosening structure 15a may be provided on the claw portion 15 of the first embodiment and its modified examples.

[0101] [Other variations] In the first embodiment described above, the annular lid portion 22 is manufactured by integrating the inner lid 22a and outer lid 22b, which are manufactured separately. However, the annular lid portion 22 may also be manufactured by insert molding using the RFID tag 5 as an insert component. In this case, the number of parts can be reduced compared to the first embodiment described above. Furthermore, because the RFID tag 5 is sealed in the annular lid portion 22, deterioration of the RFID tag 5 can be suppressed.

[0102] In the first embodiment described above, when manufacturing the annular lid portion 22, the RFID tag 5 may be attached to the inner lid 22a or the outer lid 22b with an adhesive or pressure-sensitive adhesive to hold the RFID tag 5 in a predetermined position before the inner lid 22a and the outer lid 22b are stacked.

[0103] In the first embodiment described above, the RFID tag 5 may be provided by printing on the surface of the inner lid 22a or the back surface of the outer lid 22b. In the case of Fig. 9C of the second embodiment described above, the RFID tag 5 may be provided by printing on the surface of the first annular portion 21 or the back surface of the second annular portion 22.

[0104] In the first embodiment described above, the attachment part 12 may be made of a resin material. This allows the tagged article 10 to be constructed without including any metal parts, thereby significantly suppressing a decrease in communication distance. In this case, the tag installation part 11 and the attachment part 12 may be integrally molded.

[0105] In the first embodiment described above, the mounting portion 12 shown in FIG. 2A is configured by a single component having multiple claws 15 and annular connecting portion 16 integrally formed with the multiple claws 15. However, this single component may be configured as multiple divided bodies. In this case, the tag installation portion 11 is configured to hold the multiple divided bodies. The inner periphery of the tag installation portion 11 also serves as the annular connecting portion of the mounting portion 12, which has an insertion hole 12a.

[0106] In the first embodiment described above, the annular connecting portion 16 of the mounting portion 12 may be formed in a C-ring shape. In the second embodiment described above, the mounting portion 12 may be formed in a C-ring shape.

[0107] In the second embodiment described above, the wall portion 13 formed in a substantially cylindrical shape surrounds the entire circumference of the shaft portion 2a, but the wall portion 13 may be configured to surround only a portion of the shaft portion 2a. For example, the wall portion 13 may be configured by a plurality of arc-shaped walls spaced apart in the circumferential direction.

[0108] In the second embodiment described above, the resin wall portion 43 constitutes a part of the wall portion 13, but the resin wall portion 43 may constitute the entire wall portion 13. In this case, for example, the outer periphery of the mounting portion 12 is attached to the tip of the resin wall portion 43.

[0109] In the second embodiment described above, the tag installation section 11 is formed in an annular shape, but the tag installation section 11 may also be formed in a plate shape (for example, a disk shape) without a through hole. In this case, after the metal part 42 of the tagged item 10 is installed in the fastening structure 1, the resin part 41 may be attached to the metal part 42. Also, a cover member may be provided to cover the through hole of the tag installation section 11.

[0110] In each of the above-described embodiments, the tag installation section 11 is formed in a circular ring shape, but it may also be formed in a polygonal ring shape such as an octagon, or in a C-shaped ring shape.

[0111] In each of the above-described embodiments, the RFID tag 5 may be installed on the outer surface of the tag installation section 11. For example, the RFID tag 5 may be installed on the surface of the tag installation section 11 (the surface on the tip side of the shaft section 2a in the attached state in the first embodiment, and the surface opposite the attachment section 12 in the second embodiment). In this case, a cap may be provided to cover the tag installation section 11 so as to cover the RFID tag 5.

[0112] In each of the above-described embodiments, the tagged article 10 is attached to the shank 2a of the fastening part 2, but it may also be attached to the shank 2a of a fixing part 2 (such as a pin) other than a fastening part. In this case, in the first embodiment and the fourth modified example of the second embodiment, if there is a recess on the outer peripheral surface of the shank 2a of the pin 2, the tip ends of the multiple claws 15 get caught in the recess on the outer peripheral surface of the shank 2a, thereby attaching the tagged article 10 to the shank 2a. If there is no unevenness on the outer peripheral surface of the shank 2a of the pin 2, when the tip ends of the multiple claws 15 are pressed against the outer peripheral surface of the shank 2a, the claws 15 function as leaf springs, and the tagged article 10 is attached to the shank 2a. In addition, in the first to third modified examples of the second embodiment, the tagged article 10 is attached by clamping the attachment part 12 between the head 2b of the pin 2 and the fastened member 3,

[0113] In each of the above-described embodiments, the RFID tag 5 may be of any of a passive type without a built-in battery, an active type, or a semi-passive type. [Industrial Applicability]

[0114] The present invention is applicable to RFID tagged items and the like. [Explanation of symbols]

[0115] 1 Fixed structure, fastening structure 2 Fixing parts, fastening parts 2a Shaft 5. RFID tags 10 RFID tagged items 11 Tag installation section 12 Mounting part 12a Insertion hole 13 Wall-like part 15 Claw 16 Annular joint 17 Annular recess 18 Annular Space 21 Circular bottom 22 Annular lid 22a Inner lid 22b Outer lid 41 Resin parts 42 Metal parts 43 Resin wall 44 Metal wall part

Claims

1. a tag installation section formed using an insulating material and having an RFID tag installed therein; an attachment portion that is formed by a member having an insertion hole and is integrated with or attached to the tag installation portion; An RFID tagged article, wherein the attachment portion is attached to a fixing structure using the fixing part with the shaft portion of the fixing part inserted through the insertion hole.

2. The tag installation portion is formed in a ring shape, The RFID tagged item according to claim 1 , wherein a through-hole on the inside of the tag installation section overlaps with the insertion hole when viewed from the front of the tag installation section.

3. The attachment portion has a plurality of claw portions that protrude inward from an edge portion of the insertion hole, An RFID tagged item as described in claim 2, wherein the attachment portion is attached to the shaft portion by the tips of the multiple claw portions being hooked onto or pressed against the outer surface of the shaft portion while the shaft portion is inserted through the insertion hole.

4. The RFID tagged item according to claim 3 , wherein the attachment portion is integrated with the tag installation portion such that the plurality of claw portions protrude inward from the inner periphery of the tag installation portion.

5. the attachment portion has, in addition to the plurality of claw portions, an annular connecting portion formed in an annular shape extending around the insertion hole and to which base sides of the plurality of claw portions are connected at intervals, the tag mounting portion has a first annular portion and a second annular portion that are overlapped with each other, The RFID tagged item according to claim 4 , wherein the attachment portion is integrated with the tag installation portion by sandwiching the annular connecting portion between the first annular portion and the second annular portion.

6. The RFID tagged article according to claim 5 , wherein an annular recess for accommodating the annular connecting portion is formed on a surface of the first annular portion on which the second annular portion is superimposed.

7. the second annular portion has an annular inner lid and an annular outer lid superposed on a surface of the inner lid opposite to the first annular portion, The RFID tag is formed in a ring or arc shape, The RFID tagged article according to claim 6 , wherein an annular space for accommodating the RFID tag is formed coaxially with the annular recess on the overlapping surface between the inner lid and the outer lid.

8. the second annular portion has an annular inner lid and an annular outer lid superposed on a surface of the inner lid opposite to the first annular portion, The RFID tagged article according to claim 5 , wherein the RFID tag is disposed between the inner lid and the outer lid.

9. The RFID tagged article according to claim 3 or 4, wherein the attachment portion is made of a metal.

10. The RFID tagged article according to claim 3 or 4, wherein the attachment portion is made of a resin.

11. The RFID tagged article according to claim 1 , further comprising a wall-like portion extending along the insertion direction of the insertion hole and connecting the attachment portion and the tag installation portion.

12. a resin part in which the tag installation portion and a resin wall portion constituting a part or all of the wall portion are integrated; The RFID tagged article according to claim 11 , further comprising a metal part having the attachment portion and attached to the resin part.

13. the metal component further includes a metal wall portion integrated with the mounting portion, The RFID tagged article according to claim 12 , wherein the metal wall portion is attached to the inside or outside of the resin wall portion, thereby forming the wall portion consisting of the resin wall portion and the metal wall portion.

14. An RFID tagged item as described in claim 13, wherein the wall portion has a positioning structure that determines the mounting position of the metal wall portion relative to the resin wall portion so that the tip of the metal wall portion is located closer to the mounting portion than the tag installation portion.

15. The RFID tagged article according to claim 11 , wherein the mounting portion, the wall-like portion, and the tag installation portion are formed as an integrated resin part.

16. The RFID tagged article according to claim 3 , wherein the plurality of claw portions include a claw portion having an anti-loosening structure at a tip portion thereof.

17. The RFID tagged item according to claim 1 , wherein the RFID tag is installed inside the tag installation section.

18. The RFID tagged item according to claim 2 , wherein the antenna of the RFID tag extends along the circumferential direction of the tag installation portion.

19. a fixing part having a shaft portion with a thread groove formed on an outer peripheral surface; a fastened member having a through hole formed therein and the shaft portion inserted through the through hole; a nut threaded onto the shaft portion inserted into the through hole of the workpiece from a tip side of the shaft portion, The RFID tagged article according to claim 4 is a fastening structure with an RFID tag, wherein the RFID tagged article is attached to the shaft portion closer to the tip than the nut as a part for preventing the nut from loosening.

20. a fixing part having a shaft portion with a thread groove formed on an outer peripheral surface; a fastened member having a through hole formed therein and the shaft portion inserted through the through hole; The RFID tagged item described in claim 4 is a fastening structure with an RFID tag, which is attached to the shaft portion inserted into the through hole of the fastened member from the tip side of the shaft portion as a part in place of the nut.

21. a fixing part having a shaft portion with a thread groove formed on an outer peripheral surface; a fastened member having a through hole formed therein and the shaft portion inserted through the through hole; The RFID tagged article according to claim 11 comprises: When there is no head on one end side of the shaft portion, the attachment portion is attached by being sandwiched between the nut screwed onto the shaft portion from one end side of the shaft portion and the fastened member, When there is a head on one end of the shaft portion, the attachment portion is clamped between the head and the fastened member, thereby attaching the RFID tag-equipped fastening structure.

Images