WO2019220695A1

WO2019220695A1 - Rf tag antenna and rf tag, sponge member with rf tag, silent tire with rf tag, tire with rf tag

Info

Publication number: WO2019220695A1
Application number: PCT/JP2019/003540
Authority: WO
Inventors: 詩朗杉村
Original assignee: 株式会社フェニックスソリューション
Priority date: 2018-05-15
Filing date: 2019-02-01
Publication date: 2019-11-21
Also published as: JPWO2019220695A1; JP6930776B2

Abstract

[Problem] To provide an RF tag antenna 200 and an RF tag 100 that can be attached to a resin material containing carbon powder. [Solution] An RF tag antenna 200 is used in a state of being attached to resin materials 910, 920 containing carbon powder. The RF tag antenna 200 includes a ground portion 210, a potential difference forming portion 220 for forming potential difference with respect to the ground portion 210, and an inductor pattern part 400 formed at the potential difference forming portion 220. The RF tag 100 includes the RF tag antenna 200 having the above configuration and an IC chip 500 provided at the RF tag antenna 200. The sponge member with an RF tag includes the RF tag 100 having the above configuration and a sponge member 800 provided with a mounting portion on which the RF tag 100 is mounted.

Description

RF tag antenna and RF tag, sponge member with RF tag, silent tire with RF tag, tire with RF tag

The present invention relates to an RF tag antenna and an RF tag, a sponge member with an RF tag, a silent tire with an RF tag, and a tire with an RF tag.

In recent years, RFID (Radio Frequency Identification) technology has been used in management systems that perform inventory management, logistics management, and the like of products and parts. In a system using this RFID technology, wireless communication is performed between an RF tag and a reader / writer (hereinafter referred to as a reader), and identification information stored in the RF tag is read by the reader.

For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 2012-253700) discloses a wireless communication device that facilitates attachment of a radiation conductor and a ground conductor and improves connection reliability between conductors, a manufacturing method thereof, and wireless communication A metal article with a device is disclosed.

A wireless communication device described in Patent Document 1 includes a dielectric block having a first main surface and a second main surface facing the first main surface, and a radiation conductor provided on the first main surface of the dielectric block; , A ground conductor provided on the second main surface of the dielectric block, a wireless IC element for processing a high-frequency signal, a feed conductor for connecting the radiation conductor and the ground conductor, and a short-circuit conductor for connecting the radiation conductor and the ground conductor A radio communication device including an inverted F-type antenna including at least a radiation conductor, a ground conductor, a feeding conductor, and a short-circuit conductor, each of which is configured as a flat metal conductor. The radiation conductor portion is disposed on the first main surface of the dielectric block, the ground conductor portion is disposed on the second main surface of the dielectric block, and the feeding terminal portion is mainly on the side surface of the dielectric block. It is location, in which short-circuiting conductor portions are mainly disposed on a side surface of the dielectric block.

Patent Document 2 (Japanese Patent Laid-Open No. 2007-124696) discloses a communication system that requires an ultra-wideband and small antenna device such as a Broadband-PAN (Personal Area Network) using UWB (ultra Wide Band) technology. 1 discloses a wide-band antenna device with a low profile that can also be used in Japanese.

The wideband antenna device described in Patent Document 2 is a wideband antenna device including a conductive ground plane and a radiating conductor plate that are disposed so that at least a part of each is opposed to each other, and the conductive ground plane and the radiating conductor. A magnetic material having a relative magnetic permeability of greater than 1 and approximately 8 or less is interposed between the plates.

Patent Document 3 (Japanese Patent Laid-Open No. 2013-110585) discloses a thin antenna for reading an RFID tag that is used for radio waves in the UHF band and can perform good communication even when attached to a metal member. ing.

A thin antenna tire described in Patent Document 3 includes a magnetic sheet, an antenna portion disposed on one surface of the magnetic sheet, and a conductor ground plane disposed on the other surface of the magnetic sheet, and the magnetic sheet When viewed in the thickness direction, the antenna section and the conductor ground plane are arranged so that at least a part thereof overlaps, and the thickness of the magnetic sheet is 200 μm or more and 600 μm or less.

In Patent Document 4 (Japanese Patent Laid-Open No. 10-119521), by using various metal members used inside the tire as an antenna of the transponder 3 itself (not as a primary winding), the transponder 3 itself It is disclosed to provide a more reliable transponder and a pneumatic tire with a transponder that are more compact and have no possibility of being damaged during tire running or during tire molding or vulcanization.

In the pneumatic tire with a transponder described in Patent Document 4, the electronic circuit of the transponder and a predetermined metal component inside the tire are electrically directly connected, so that the metal component becomes an antenna for receiving and transmitting the transponder. It is characterized by this.

JP 2012-253700 A JP 2007-124696 A JP 2013-110585 A JP-A-10-119521

Patent Document 1 discloses an inverted-F type RF tag antenna. However, there is a problem that long-distance reading cannot be performed even if a dielectric is used.

Further, in Patent Documents 2 and 3, since the structure is complicated such as feeding using a coaxial line or a strip line, there is a problem that the manufacturing cost increases, and furthermore, it is difficult to adjust the resonance frequency according to the application. There was a problem.
Furthermore, in patent document 4, it is essential to attach directly to a bead wire (steel wire), and there is a problem that an RF tag cannot be used for a tire without a steel wire or a resin material containing carbon powder. there were.
In addition, when a general RF tag is brought close to a resin material containing carbon powder, the resonance frequency shifts, which hinders communication, or the resin material containing carbon powder causes poor RF tag communication. there were.

A main object of the present invention is to provide an RF tag antenna and an RF tag that can be attached to and communicate with a resin material containing carbon powder.
Another main object of the present invention is to provide an RF tag antenna and an RF tag, a sponge member with an RF tag, a silent tire with an RF tag, and a tire with an RF tag that can be attached to and communicate with a resin material containing carbon powder. That is.

(1)
An RF tag antenna according to one aspect is an RF tag antenna that is used by being attached to a resin material containing carbon powder. The RF tag antenna includes a ground portion, a potential difference forming portion that forms a potential difference with respect to the ground portion, and a potential difference. And an inductor pattern portion formed in the formation portion.

In this case, a potential difference can be formed with respect to the ground portion by the potential difference forming portion. In addition, since the resin material containing carbon powder is a high-resistance conductor, radio wave absorption occurs and RF tag communication cannot be performed. However, in the present invention, an impedance is generated by the potential difference forming portion, and a resin material containing carbon powder can be used as a part of the antenna.
Furthermore, a resonance circuit can be formed by the capacitor formed by the potential difference forming portion and the coil formed by the inductor pattern portion, and the influence on the resin material containing carbon powder can be prevented.
Even when the RF tag antenna is used for a tire, a steel wire can be used as a part of the antenna.
Furthermore, the antenna can be applied to various antennas such as a dipole antenna, a collinear array antenna, a tablet antenna, a monopole antenna, and an inverted F antenna.

(2)
The RF tag antenna according to a second aspect of the present invention is the RF tag antenna according to one aspect, wherein the potential difference may be not less than 10 kΩ and not more than 1 MΩ.

When the RF tag of the present invention is used while being attached to the inside of a tire, the resistance value varies greatly depending on the degree of dispersion of the carbon powder contained in the tire itself, and therefore it is usually necessary to compensate for the wavelength variation for each tire.
However, by setting the impedance of the potential difference generated between the potential difference forming portion and the inner surface of the tire to be 10 kΩ or more and 1 MΩ or less, it is possible to minimize the influence of the variation in carbon powder that varies from tire to tire.

(3)
An RF tag antenna according to a third aspect is the RF tag antenna according to one aspect or the second aspect, wherein the potential difference forming portion has a bent portion or a curved portion with respect to a ground portion formed of a flat plate. It may consist of.

In this case, since the potential difference forming portion is formed by a flat plate having a bent portion or a curved portion with respect to the ground portion, the formation of the potential difference forming portion can be easily realized.

(4)
An RF tag antenna according to a fourth aspect of the present invention is the RF tag antenna according to the third aspect of the present invention from one aspect, wherein the potential difference forming part may include a spacer at least in part.

In this case, the potential difference forming portion can create a space for forming a potential difference from the ground portion by the spacer. In addition, a stable space can be formed by using a spacer made of a dielectric. The dielectric may be made of styrene foam, ceramic, or any other material.

(5)
An RF tag antenna according to a fifth aspect of the present invention is the RF tag antenna according to the fourth aspect of the present invention, wherein the inductor pattern portion may be formed by a notch.

In this case, since the inductor pattern portion is formed by notches, an increase in the number of parts can be prevented.

(6)
An RF tag antenna according to a sixth aspect of the present invention is the RF tag antenna according to the fifth aspect of the present invention, wherein the ground part and the potential difference forming part may be formed from a continuous flat plate.

In this case, since the ground portion and the potential difference forming portion are formed from a continuous flat plate, they can be formed from a single flat plate.

(7)
An RF tag antenna according to a seventh aspect of the present invention is the RF tag antenna according to the sixth aspect of the present invention, wherein the element length of the potential difference forming portion is from λ / 4 or 5λ / 8 in the case of the target wavelength λ. It may be.

In this case, since the element length of the potential difference forming portion is λ / 4 or 5λ / 8 when the target wavelength is λ, the transmission / reception distance can be increased.

(8)
An RF tag according to another aspect includes the RF tag antenna according to any one of the seventh aspect to the seventh invention, and an IC chip provided in the RF tag antenna.

In this case, a potential difference can be formed with respect to the ground portion by the potential difference forming portion. In addition, since the resin material containing carbon powder is a high-resistance conductor, radio wave absorption occurs and RF tag communication cannot be performed. However, in the present invention, an impedance is generated by the potential difference forming portion, and a resin material containing carbon powder can be used as a part of the antenna.
In addition, as a raw material of the resin material used for this invention, it is not limited to the resin hardened | cured material or resin molding formed by hardening | curing or forming resin. The material of the resin material can contain at least one selected from the group consisting of resin, rubber, and elastomer. For example, as a material of a resin material used for a tire, conventionally known synthetic rubber and / or natural rubber can be contained.
Further, even when used for a tire, a steel wire can be used as a part of an antenna.
Furthermore, the antenna can be applied to various antennas such as a dipole antenna, a tablet antenna, and a monopole antenna.

(9)
The RF tag according to the ninth aspect of the present invention may further include a case for accommodating the RF tag antenna in the RF tag according to the eighth aspect of the present invention.

In this case, the RF tag can be protected by the case. Further, by using an electrically insulating case such as a resin film or a resin plate, it is possible to prevent other metals from coming into direct contact with the ground portion, the IC chip, or the potential difference forming portion.

(10)
An RF tag according to a tenth invention is the RF tag according to the ninth invention, wherein the case has a holding part capable of holding the RF tag antenna and a base part which can be bent to the holding part. And a first holding part and a second holding part extending from the first holding part, and the base part includes a first base part and a second base part extending from the first base part. And the first holding part and the first base part are connected, the second holding part and the second base part are separated, and by folding the first holding part and the first base part, The ground portion of the RF tag antenna disposed between the first holding portion and the first base portion is disposed between the first holding portion and the first base portion, and the potential difference forming portion is the second holding portion. It may be affixed to.

In this case, the case holding portion and the base portion are valley-folded, the ground portion of the RF tag antenna is disposed between the first holding portion and the first base portion, and the potential difference forming portion is attached to the second holding portion. By wearing, an RF tag with a case can be manufactured relatively easily.

(11)
An RF tag according to an eleventh aspect of the invention is the RF tag according to the ninth aspect or the tenth aspect of the invention, wherein the case has a notch portion formed in the second base portion and a convex portion formed in the second holding portion. The potential difference forming portion may be formed by fitting the convex portion into the cutout portion.

In this case, the potential difference forming part can be stably formed by adopting a structure in which the notch part is fitted to the convex part in the case.

(12)
An RF tag according to a twelfth aspect of the invention is the RF tag according to any of the ninth to eleventh aspects of the invention. Or a double-sided tape may be provided.

In this case, since the adhesive, adhesive or double-sided tape is formed on the case, the RF tag can be easily attached to the resin material containing carbon powder.

(13)
The sponge member with an RF tag according to still another aspect includes any one of the RF tags according to the twelfth invention from the RF tag according to another aspect, and a sponge member.

In this case, a tire is mentioned as an example of the resin material containing carbon powder. A sponge member is preferably attached to the tire from the viewpoints of quietness and soundproofing.
The sponge member with the RF tag can communicate with the reader before being attached to the tire, and can be easily managed.

(14)
The silent tire with an RF tag according to still another aspect includes a sponge member with an RF tag according to still another aspect and a tire.

In this case, the quietness and soundproofness of the tire can be improved. Furthermore, it is possible to communicate with the RF tag even when the tire is stored, that is, when a plurality of tires are stacked. As a result, the tire can be easily managed.

(15)
A tire with an RF tag according to still another aspect includes any one of the RF tags according to the twelfth invention from the RF tag according to the other aspect, and the tire.

In this case, it is possible to communicate with the RF tag even in a tire storage state, that is, in a state where a plurality of tires are stacked and stacked. As a result, the tire can be easily managed.

(16)
A tire with an RF tag according to a sixteenth aspect of the invention is the tire with an RF tag according to the fifteenth aspect of the invention, wherein the ground portion may contact the tire and the potential difference forming portion may be separated from the inner peripheral surface of the tire.

In this case, a potential difference can be formed with respect to the ground portion by the potential difference forming portion. In addition, since the ground portion is in contact with the tire and the potential difference forming portion is separated from the inner peripheral surface of the tire, impedance is stably generated by the potential difference forming portion, and a resin material containing carbon powder is used as a part of the antenna. Furthermore, a resonance circuit can be formed by the capacitor formed by the potential difference forming portion and the coil formed by the inductor pattern portion, thereby preventing the influence on the resin material containing carbon powder.

(17)
A silent tire with an RF tag according to a seventeenth invention includes the tire with an RF tag according to the sixteenth invention and a sponge member provided with a mounting portion for mounting the RF tag.

In this case, since the sponge member is attached to the tire, it is possible to impart characteristics such as silence and soundproofing to the tire and to easily manage the tire.

It is a typical perspective view which shows an example of RF tag concerning this Embodiment. FIG. 2 is a schematic development view of the RF tag of FIG. 1. It is the typical enlarged view to which A of the inductor pattern part of FIG. 2 was expanded. It is a typical assembly drawing which shows an example which forms RF tag. It is a typical assembly drawing which shows an example which forms RF tag. It is a typical assembly drawing which shows an example which forms RF tag. It is a schematic diagram which shows an example of the usage condition of RF tag. It is a schematic diagram which shows the other example of the usage condition of RF tag. It is typical sectional drawing for demonstrating the reason for providing an electric potential difference formation part. It is a schematic diagram which shows the other example of RF tag. It is a schematic diagram which shows the other example of RF tag. It is a schematic diagram which shows the other example of RF tag. It is a schematic diagram which shows the other example of RF tag. It is a schematic diagram which shows an example of the sponge member with RF tag. It is a typical sectional view showing an example of a sponge member with an RF tag. FIG. 16 is a sectional view taken along line AA in FIG. It is a schematic diagram which shows an example of a silent tire with an RF tag.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Moreover, in the case of the same code | symbol, those names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[This embodiment]
FIG. 1 is a schematic perspective view showing an example of an RF tag 100 according to the present embodiment, and FIG. 2 is a schematic development view of the RF tag 100 of FIG.

(RF tag 100)
An RF tag 100 according to the present invention is mainly attached to an article and can perform transmission / reception with a reader / writer.
As shown in FIGS. 1 and 2, the RF tag 100 according to the present invention includes an RF tag antenna 200, an IC chip 500, and a case 600. Hereinafter, each part will be described in detail.

(RF tag antenna 200)
As shown in FIGS. 1 and 2, the RF tag antenna 200 includes a ground part 210 and a potential difference forming part 220. An inductor pattern unit 400 is formed in the potential difference forming unit 220, and the IC chip 500 is mounted on a part of the inductor pattern unit 400.

(Ground part 210)
As shown in FIGS. 1 and 2, the ground portion 210 is made of a metal thin film of a conductive metal such as aluminum. Generally, the thin film in this embodiment is formed with a thickness of 3 μm or more and 35 μm or less. You may use what formed the metal thin film on the resin film. The ground part 210 is formed by a technique such as etching or pattern printing. The ground part 210 is formed from a flat plate. In this specification, a flat plate means a thin plate-like thing, and the thickness of a flat plate is not limited. As described above, the thickness of the flat plate is preferably 3 μm or more and 35 μm or less.

(Potential difference forming part 220)
The potential difference forming part 220 is made of a metal thin film of a conductive metal such as aluminum. Generally, the thin film in this embodiment is formed with a thickness of 3 μm or more and 35 μm or less. You may use what formed the metal thin film on the resin film.
The potential difference forming unit 220 is formed by a technique such as etching or pattern printing.
In the present embodiment, ground portion 210 and potential difference forming portion 220 are made of the same material. That is, the ground part 210 and the potential difference forming part 220 can be formed by cutting and / or processing a continuous metal thin film. As will be described later, the ground part 210 and the potential difference forming part 220 can be formed by cutting and / or processing a rectangular flat plate made of a continuous metal thin film.

Note that the material of the ground part 210 and the potential difference forming part 220 may be the same or different. For example, the metal material constituting the ground part 210 and the metal material constituting the potential difference forming part 220 may be different, or the metal material constituting the ground part 210 and the metal material constituting the potential difference forming part 220 are the same. And different thicknesses or different surface treatments. The antenna length of the potential difference forming unit 220 will be described later.

(Inductor pattern portion 400)
FIG. 3 is a schematic enlarged view in which the portion A of the inductor pattern portion 400 of FIG. 2 is enlarged.

As shown in FIG. 3, the inductor pattern portion 400 can be formed by providing a rectangular opening on a conductive flat plate constituting the potential difference forming portion 220. The opening has an internal area S. The inductor pattern unit 400 includes a region surrounded by a side 404, a side 405, a side 406, a side 407, and a side 408.
Further, in the present embodiment, the impedance of the inductor pattern portion 400 can be made constant by the internal area S of the inductor pattern portion 400.

Although not a constituent element of the RF tag antenna 200, a rectangular cutout 420 having a lateral opening is formed on a conductive flat plate constituting the potential difference forming part 220. The notch 420 is formed from a side 401, a side 402, a side 403, a side 409, a side 410, and a side 411.

A notch is formed between the side 403 and the side 409, and an IC chip 500 described later is provided so as to bridge between the side 403 and the side 409. The notch 420 and the opening communicate with each other through the gap. Note that although the case where the notch is formed between the side 403 and the side 409 has been described, the invention is not limited thereto, and an insulating portion may be formed between the side 403 and the side 409.

In this embodiment, the inductor pattern portion 400 is made of an aluminum metal thin film. Generally, the thin film in this embodiment is formed with a thickness of 3 μm or more and 35 μm or less. You may use what formed the metal thin film on the resin film. The inductor pattern part 400 can be formed by drilling an opening in a metal thin film. The inductor pattern portion 400 is formed by a technique such as etching or pattern printing.

In the present embodiment, the impedance of the inductor pattern portion 400 can be made constant by the internal area S of the inductor pattern portion 400.

(IC chip 500)
The IC chip 500 is arranged so as to bridge the side 403 and the side 409 of the inductor pattern part 400 on the upper surface side of the RF tag antenna 200 (on the same plane as the potential difference forming part 220). The IC chip 500 operates based on radio waves received by the plate antenna of the RF tag antenna 200.
Specifically, the IC chip 500 according to the present embodiment first rectifies a part of the carrier wave transmitted from the reading device, and the IC chip 500 itself generates a power supply voltage necessary for operation. Then, the IC chip 500 operates a non-volatile memory in which the control logic circuit in the IC chip 500, the unique information of the product, and the like are stored, according to the generated power supply voltage.
Further, the IC chip 500 operates a communication circuit for transmitting / receiving data to / from a reading device (reader).

(Case 600)
The case 600 includes a band-shaped or rectangular flat plate-shaped holding portion 610, a band-shaped or rectangular flat plate-shaped base portion 650, a fold 6L, a hole 6H, and an insertion portion 620. The case 600 shown in this embodiment can be formed by cutting an insulating member such as a resin film or a thin resin plate.
The fold 6L is formed between the holding portion 610 and the base portion 650, and the holding portion 610 can be valley-folded with respect to the base portion 650 along the fold 6L. For example, as shown in FIG. 2, the crease 6L can be composed of a plurality of short slits and long slits. The insertion part 620 is provided to extend to one end side of the holding part 610.

Hereinafter, the configuration of the case 600 will be described in detail.
As shown in FIGS. 4 to 6, the case 600 includes a holding portion 610 that can hold the RF tag antenna 200 and a base portion 650 that can be bent to the holding portion 610. The holding unit 610 includes a first holding unit 611 and a second holding unit 612 extending continuously from the first holding unit 611. The base portion 650 includes a first base portion 651 and a second base portion 652 that extends continuously from the first base portion 651.

The first holding part 611 and the first base part 651 are connected. The first holding part 611 and the first base part 651 are formed in substantially the same size with substantially the same width and substantially the same length. The second holding part 612 and the second base part 652 are separated by a long slit.
By grounding the first holding part 611 and the first base part 651, the ground part 210 of the RF tag antenna 200 disposed between the first holding part 611 and the first base part 651 is It is arranged between the holding part 611 and the first base part 651.

The width dimension of the ground part 210 of the RF tag antenna 200 may be substantially the same as the width dimension of the first holding part 611 and the first base part 651, or may be formed slightly smaller. The length dimension of the ground part 210 may be substantially the same as the length dimension of the first holding part 611 and the first base part 651, or may be formed slightly smaller.
The potential difference forming part 220 (or the conductive member for forming the potential difference forming part) of the RF tag antenna 200 is attached to the second holding part 612 with an adhesive or the like.

A notch (or hole) 6H is formed in the second base portion 652, and a convex portion (or insertion portion) 620 is formed in the second holding portion 612. By inserting and fitting the convex portion 620 into the notch portion 6H, the second holding portion 612 to which the conductive member is attached is arranged in a state of being separated from the second base portion 652 (a state in which an air layer exists between them). Therefore, a potential difference forming portion 220 that is separated from the resin material existing on the inner peripheral surface of the tire is formed.

The width of the insertion part 620 is slightly smaller than the width of the holding part 610. The hole 6H is provided at a position separated from the one end side of the base portion 650 by a predetermined distance. The hole 6H can be formed by a long slit in a direction orthogonal to the longitudinal direction of the base portion 650.

As shown in FIG. 2, the case 600 can be formed of a thin resin film or resin plate mainly made of polyethylene terephthalate. In addition to polyethylene terephthalate, one or a plurality of insulating materials or resins such as polyimide and polyvinyl chloride may be used as the case 600.

The case 600 is for protecting the IC chip 500, the ground part 210, and the potential difference forming part 220. Therefore, the case 600 preferably has a thickness of several micrometers to several hundred micrometers, and more preferably has a thickness of about several tens of micrometers.
In the present embodiment, the case 600 is provided. However, the present invention is not limited to this, and the case 600 may not be provided, and another insulating coating process may be used. Also in that case, the thickness of the insulating coating layer is preferably several micrometers or more and several hundred micrometers or less, and more preferably about several tens of micrometers.

Next, FIG. 4, FIG. 5, and FIG. 6 are schematic assembly views showing an example of forming the RF tag 100 shown in FIG. 2 to FIG.

As shown in FIG. 4, the RF tag antenna 200 provided with the IC chip 500 is attached to the holding portion 610 that holds the RF tag antenna 200 of the case 600. In this case, the RF tag antenna 200 may be bonded and fixed to the holding portion 610 using an adhesive, and the RF tag antenna 200 provided with the IC chip 500 may be disposed in the case 600 as it is. The size of the holding portion 610 of the case 600 and the size of the RF tag antenna 200 are preferably set to be approximately the same.

Next, as shown in FIG. 5, the fold line 6 </ b> L formed between a part of the holding portions 610 and the base portion 650 of the case 600 is folded, and the RF tag antenna 200 is attached to the base portion 650 of the case 600. Sandwich between the holding part 610 and fix.
Here, the base unit 650 includes a first base unit 651 and a second base unit 652, and the holding unit 610 of the RF tag antenna 200 includes a first holding unit 611 and a second holding unit 612. A boundary line 653 is formed at the boundary between the first base portion 651 and the second base portion 652 of the base portion 650, and is between the first holding portion 611 and the second holding portion 612 of the holding portion 610 of the RF tag antenna 200. A boundary line 613 continuous with the boundary line 653 is formed. The longitudinal dimension of the first base part 651 and the first holding part 611 is set to be the same. The dimension in the longitudinal direction of the second holding part 612 is set to be slightly larger than the distance between the boundary line 653 and the hole 6H. Further, as shown in FIG. 5, the first base portion 651 and the first holding portion 611 are continuous, but the second base portion 652 and the second holding portion 612 are separated.

As a result of the above operation, the ground portion 210 of the RF tag antenna 200 is sandwiched (preferably bonded) between the first base portion 651 and the first holding portion 611, and the conductive material constituting the potential difference forming portion 220 of the RF tag antenna 200. The member is attached to the second holding part 612 of the case 600. The second base portion 652 of the case 600 is in a state separated from the second holding portion 612.
Subsequently, as shown in FIG. 6, the insertion portion 620 of the case 600 is inserted into the hole 6 </ b> H of the case 600 in the direction of arrow Y.

As a result, the RF tag 100 shown in FIG. 1 is formed. In this case, since the dimension in the longitudinal direction of the second holding part 612 is longer than the distance between the boundary line 653 and the hole 6H, the potential difference forming part 220 is inserted as shown in FIG. 1 by inserting the insertion part 620 into the hole 6H. Is curved from the base portion 650 of the case 600, and a so-called arch shape can be easily formed. In this way, a space is formed between the base portion 650 and the potential difference forming portion 220. Since the case 600 has elasticity and is formed of a relatively stiff member, the arch shape of the potential difference forming part 220 can be maintained.

Next, FIG. 7 is a schematic diagram illustrating an example of a usage mode of the RF tag 100 having the above configuration, and FIG. 8 is a schematic diagram illustrating another example of a usage mode of the RF tag 100.

In the usage mode shown in FIG. 7, the RF tag 100 according to the present invention is provided on a static electricity removing sheet 910 containing carbon powder and / or carbon fiber (particularly, carbon black). The static eliminating sheet 910 can contain a resin, an elastomer, and / or rubber. The RF tag 100 can be attached to the static eliminating sheet 910 using an adhesive or the like. As a result, the RF tag 100 according to the present invention can perform transmission and reception without being affected by the carbon powder.
Further, even when a plurality of static electricity removal sheets 910 are stacked and disposed, the potential difference is provided by the potential difference forming unit 220, so that the RF tag 100 can transmit and receive. The reason why the transmission / reception can be performed will be described later.

In the usage mode shown in FIG. 8, the RF tag 100 is provided inside a tire (automobile, bicycle, motorcycle, etc.) 920 containing carbon powder and / or carbon fiber (particularly carbon black). In order to provide the RF tag 100 on the inner side of the tire 920, the RF tag 100 is usually arranged so that the longitudinal direction of the RF tag is along the circumferential direction of the tire 920. However, the RF tag may be arranged so that the longitudinal direction of the RF tag is inclined or orthogonal to the circumferential direction of the tire 920 as necessary.

The tire 920 can contain conventional rubber (natural rubber, synthetic rubber), a vulcanizing agent, a filler and the like in addition to the carbon powder. Generally, the carbon powder is blended in an amount of 40 to 60 parts by weight, particularly 45 to 55 parts by weight, based on 100 parts by weight of rubber. Specifically, for tires in which 30 parts by weight or more and 60 parts by weight or less of carbon black is mixed with 100 parts by weight of diene rubber containing 30% by weight or more and 90% by weight or less of butadiene rubber, a vulcanizing agent, a filler and the like. A rubber composition can be vulcanized to produce a tire.

The RF tag 100 can be attached to the tire 920 using an adhesive or the like. In addition, since the tire 920 is used by being rotated, it is preferable that the tire 920 is attached to the center portion in the width direction of the tire 920 inside the tire 920.
Since the RF tag 100 is attached to the tire 920 in a state where the potential difference forming portion 220 is curved from the base portion 650 of the case 600, vibration and deformation of the potential difference forming portion 220 are prevented even when the tire 920 rotates and vibrates at high speed. The
Further, although the tire 920 is normally stored horizontally and stacked, the RF tag 100 according to the present invention is provided with a potential difference by the potential difference forming unit 220. Therefore, the RF tag 100 performs transmission and reception. be able to. Further, in the case where carbon powder (carbon black) contained in the tire 920 or the tire itself and further steel wire are included, the steel wire can be used as an antenna.

Next, FIG. 9 is a schematic cross-sectional view for explaining the reason why the potential difference forming part 220 is provided. In FIG. 9, the usage mode in which the RF tag 100 is provided on the tire 920 shown in FIG. 8 will be described. Further, in the example of FIG. 9, it is assumed that a metal steel wire 925 is incorporated in the tire 920.

First, a general tire 920 will be described here. Hard rubber used for a general tire 920 maintains hardness by adding carbon powder and vulcanizing. It is also known that carbon powder is often used as a radio wave absorber. Therefore, the inside of the tire 920 includes a radio wave absorber and a radio wave shield covered with the steel wire 920. As a result, it is found that it is difficult to transmit and receive the RF tag in a resin material containing carbon powder (carbon black) such as the tire 920. Therefore, when the RF tag 100 is installed inside the tire 920, it becomes difficult for the RF tag 100 to communicate with the outside of the tire 920 due to the influence of the carbon powder contained in the tire 920.

The inventor measured the amount of attenuation inside a general tire 920. As a result, the amount of attenuation was 9 dB when stacked with two-tier tires, 16 dB when stacked with three-tier tires, and 23 dB when stacked with four-tier tires.

That is, when the reception sensitivity of a general RF tag is −10 dB, it has been found that when the tires 920 are stacked in a three-level stack and a four-level stack, the operation sensitivity of the RF tag does not reach and communication becomes impossible.
In addition, when the reception sensitivity of the RF tag is −20 dB, it has been found that when the tires 920 are stacked in a four-stage stack, the operation sensitivity of the RF tag does not reach and communication becomes impossible.

Furthermore, in a general tire 920, the DC resistance 930 (see FIG. 9) varies between several tens of kilohms and several hundreds of kilohms depending on the degree of dispersion of the carbon powder (carbon black) contained in the tire 920 itself. As a result, it was found that the relative permittivity changes and it is necessary to compensate for the wavelength fluctuation for each tire 920.

From the above, the present inventor has found and realized a technical idea of capturing a radio signal into the RF tag 100 by using the tire 920 itself as an antenna. In addition to the tire 920 itself, the steel wire 925 is replaced with an antenna, and the technical idea of capturing a radio signal into the RF tag 100 has been found and realized. This will be described below.

As shown in FIG. 9, when the ground portion 210 of the RF tag 100 according to the present invention is attached to the inner surface 921 of the tire 920, a capacitor C can be formed between the potential difference forming portion 220 and the inner surface 921.
As a result, the portion of the potential difference forming portion 220 that is provided apart from the inner surface 921 of the tire 920 can have high impedance.
That is, it is preferable to set the potential difference between the inner surface 921 of the tire 920 and the potential difference forming portion 220 in a range of 10 kilohms or more and 1 megaohms or less. In other words, the resistance of the air layer formed between the inner surface 921 of the tire 920 and the potential difference forming part 220 is preferably set in the range of 10 kilohms or more and 1 megaohms or less.

Therefore, a resonant circuit can be formed from the reactance L of the inductor pattern portion 400 and the capacitor C, and the carbon powder (carbon black) contained in the tire 920 affects the element length of the RF tag 100. This can be prevented.
As a result, the ground portion 210 can capture the carbon powder (carbon black) or the steel wire 925 as an antenna into the IC chip 500 of the RF tag 100 as an electric field.

That is, by forming the reactance L and the capacitor C, the carbon powder or steel wire of the tire 920 can be used as an antenna. Therefore, even when the RF tag 100 is installed inside the tire 920, communication with the outside of the tire 920 is possible. Defects can be made difficult to occur. Furthermore, by making the capacitor C have a high impedance, it is possible to minimize the influence of the variation in carbon powder that varies from tire to tire.

In the present embodiment, the element length of the potential difference forming unit 220 is twice the length of the side L1 and the side L2 (see FIG. 2), and the side 401, the side 402, and the side 403 of the notch 420. , Side 409, side 410, and side 411. The optimum element length of the potential difference forming unit 220 is λ / 4 or 5λ / 8 with respect to the target frequency λ.

In the present embodiment, the element length is designed to be ¼ of the wavelength λ of the frequency to be used. The element length may be 5/8 of the wavelength λ. The wavelength λ can be calculated by the propagation speed (light speed (c)) / frequency (F).
Specifically, when the frequency is 920 MHz, the propagation speed (the speed of light (c)) is 300 Mm / s, and the value T is the value T = (300 ÷ 920 MHz) /4≈81.5 mm.
In this case, the length of each side is adjusted so that the element length is 81.5 mm. Since the element length is an approximate value, the numerical value itself may have an error of around ± 5%. This is because the reading distance of the RF tag 100 is shortened, but can be adapted to the specification by adjustment.

10 to 13 are schematic views showing still another example of the RF tag 100 of FIG.
As shown in FIG. 10, the RF tag 100 has a shape in which the potential difference forming unit 220 includes a first potential difference forming unit 221, a second potential difference forming unit 222, and a third potential difference forming unit 223, and forms a part of a trapezoid. It may consist of. The potential difference forming unit 220 can be formed by bending a metal thin plate multiple times. The metal thin plate may be laminated on the resin film.
Further, as shown in FIG. 11, the potential difference forming unit 220 of the RF tag 100 may include a fourth potential difference forming unit 224 and a fifth potential difference forming unit 225, and may have a shape forming a part of a triangle. The potential difference forming unit 220 can be formed by bending a plurality of metal thin plates or a laminate in which metal thin plates are laminated on a resin film.

Furthermore, as shown in FIG. 12, the potential difference forming unit 220 of the RF tag 100 includes a sixth potential difference forming unit 226, a seventh potential difference forming unit 227, an eighth potential difference forming unit 228, and a ninth potential difference forming unit 229. The shape may form a part of a polygon. The potential difference forming unit 220 can be formed by bending a plurality of metal thin plates or a laminate in which metal thin plates are laminated on a resin film.

Further, as shown in FIG. 13, the potential difference forming unit 220 of the RF tag 100 is arranged in the tenth potential difference forming unit 230, the eleventh potential difference forming unit 231, and the space between the potential difference forming unit 220 and the ground unit 210. The spacer 232 may be included.
The spacer 232 is preferably made of a heat-resistant member that is lightweight and flexible. For example, a foam member (foamed polystyrene) or the like is preferable.
Originally, it is most preferable to use air instead of the spacer 232, but in order to prevent the potential difference forming part 220 from being maintained at a predetermined interval and contacting it, it is preferable to use a polystyrene foam having 90% by volume or more of air. More preferably, it is an independent foamed polystyrene having 95 volume% or more and 99 volume% or less of air.

As a result, the spatial distance of the potential difference forming unit 220 can be maintained at a predetermined interval. The relative dielectric constant of the spacer 232 is desirably in the range of 1% to 20%. More preferably, it is 1.01% or more and 2.70% or less, most preferably 1.01% or more and 2.50% or less, and most preferably 1.02% or more and 1.08% or less. When a polystyrene foam is used as the spacer 232, the foaming ratio of the polystyrene foam is preferably 15 to 60 times (in this case, the relative dielectric constant is 1.50% to 2.50%).

On the other hand, when a material having a relative dielectric constant of 1% or more and 2,7% or less (particularly 1.50% or more and 2.50% or less) such as styrene foam is used as the potential difference forming part 220, the opening of the potential difference forming part 220 is opened. The area can be kept large, and the communication distance can be extended from several meters to several tens of meters.

In the present embodiment, the insulating base material 140 is made of foamed polystyrene, but is not limited to this, and may be an insulating material such as polyethylene, polyimide, thin foam (bola), or the like. Other foams or materials having the following may be used.

In the above embodiment, the case where the foamed polystyrene is used as the spacer 232 has been described, but a dielectric may be used. For example, the dielectric may be resin, ceramic, paper, or the like. Further, when ceramic (relative permittivity is more than 5% and not more than 9%) is used as the spacer 232, the opening area of the potential difference forming unit 220 is reduced and the communication distance is reduced, but the RF tag 100 is reduced in size. Can be
The spacer 232 may have a foamed shape, may have one or many cavities, and may be made of a composite material in which different kinds of materials are mixed or laminated.

In the present embodiment, the potential difference forming portion 220 is formed by inserting the RF tag 100 into the hole 6H of the insertion portion 620 of the case 600. However, the present invention is not limited to this, and the potential difference is formed by adhesion or the like. The portion 220 may be formed. In addition, although a conductive adhesive or an adhesive layer 450 is used, the present invention is not limited to this, and any conductive adhesive such as a conductive double-sided tape, solder, one-component or two-component epoxy resin, etc. It may be.

Further, the space between the potential difference forming part 220 and the case 650 is formed, but the present invention is not limited to this, and the space is embedded with a member similar to the spacer 232 or a lightweight and flexible heat-resistant member. Alternatively, the potential difference forming unit 220 may be formed by using any method such as forming a frame.

(Other examples)
14 is a schematic view showing an example of a sponge member with an RF tag, FIG. 15 is a schematic cross-sectional view showing an example of a sponge member with an RF tag, and FIG. 16 is a cross-sectional view taken along line AA in FIG. FIG. 17 is a schematic diagram showing an example of a silent tire 920 with an RF tag.

14 to 16, the sponge member with an RF tag includes a long sponge member 800 and an RF tag 100. The RF tag 100 is built in a part of the sponge member 800. That is, the sponge member 800 and the RF tag 100 are integrated.

A recess (mounting portion) is formed in a part of the sponge member 800 on the tire side so that the RF tag 100 can be mounted, and the sponge member 800 and the RF tag 100 are integrated by mounting the RF tag 100 in the recess. can do.
The RF tag 100 may be adhered to the sponge member 800 using an adhesive, or the RF tag 100 may be attached to the sponge member 800 by fitting or locking of physical unevenness.

When the RF tag 100 is attached to the sponge member 800, the tire-side bottom surface of the sponge member 800 and the ground portion 210 (and the base portion 650) of the RF tag 100 are substantially flush with each other. When the sponge member 800 with the RF tag 100 is attached to the inner surface of the tire, the ground portion 210 of the RF tag 100 is arranged in contact with the inner surface of the tire. The ground portion 210 is in contact with the inner surface of the tire via an insulating layer such as an adhesive layer, or directly in contact with no insulating layer.

In order to manufacture the sponge member 800, a long sponge member can be cut into appropriate dimensions so as to fit the inner peripheral dimensions of the tire. In that case, a plurality of RF tags 100 are built in (attached) to the long sponge member at predetermined intervals.

As shown in FIG. 14 to FIG. 17, the sponge member 800 is cut according to the peripheral length of the central portion in the inner circumferential direction (circumferential direction) of the tire 920, and then an adhesive or the like is used on the inner surface of the tire 920. Affixed. The sponge member 800 attached to the inner surface of the tire 920 is made of an insulating special sound absorbing sponge. The sponge member 800 prevents vibration, noise, and the like, and further has a sound absorbing effect.

That is, as the sponge member 800, a foam molded body having heat resistance and sound absorption can be used. In the case where a foamed molded body is used as the sponge member, silicone rubber sponge, fluorine rubber sponge, nitrile rubber sponge, acrylic rubber sponge, chloroprene rubber sponge, ethylene propylene rubber sponge and the like can be mentioned. From the viewpoint of heat resistance, silicone rubber sponge, fluorine rubber sponge, nitrile rubber sponge and acrylic rubber sponge are preferably used.

The foamed molded body is a porous structure, and the cells (holes) may be communication holes or closed cells. When the cell of the foam molded body is a communicating hole, the sound absorption and sound insulation of the foam molded body are improved, and when the cell of the foam molded body is closed cell, the sound insulating performance is improved. That is, it is presumed that the energy of sound (road noise) is converted into heat and the road noise is reduced by the vibration of the thin film forming the cells (holes) of the foam molded article.

When the sponge member 800 with the RF tag is attached to the inner surface of the tire using an adhesive, the type of adhesive to be used is not limited, and depending on the type of foamed molded product, a synthetic rubber type, a cyanoacrylate type, an epoxy It can be appropriately selected from vulcanized adhesives based on silicone and silicone rubber, silane coupling agents and the like.

In FIGS. 14 to 16, the sponge member 800 has a double mountain structure, but is not limited thereto, and may be a single mountain structure or any other shape. Devices that effectively reduce tire cavity resonance may be included.

As a result of the sponge member 800 and the RF tag 100 being integrated, the RF tag 100 is attached to the inside of the tire 920 simultaneously with the sponge member 800. As a result, the operation of attaching the RF tag 100 to the tire can be simplified. Further, the work of attaching the RF tag 100 individually to the tire 920 can be omitted, and the cost can be reduced.

As described above, in the RF tag 100 according to the present invention, the potential difference forming part 220 can form a potential difference with respect to the ground part 210. In addition, since the resin material including the carbon powder (tire 920 or the like) is a high-resistance conductor, radio wave absorption occurs and the RF tag 100 cannot communicate. However, in the present invention, high impedance is generated by the potential difference forming unit 220, and a resin material containing carbon powder can be used as a part of the antenna.
Further, even when the tire 920 is used, the steel wire 925 can be used as a part of the antenna.

In the present invention, the IC chip 500 corresponds to an “IC chip”, the RF tag antenna 200 corresponds to an “RF tag antenna”, the inductor pattern portion 400 corresponds to an “inductor pattern portion”, and the ground portion 210 corresponds to “ The RF tag 100 corresponds to the “RF tag”, the potential difference forming unit 220 corresponds to the “potential difference forming unit”, the spacer 232 corresponds to the “spacer”, and the silent tire 920 with the RF tag is provided. Corresponds to “silent tire with RF tag, tire with RF tag”, sponge member 800 corresponds to “sponge member with RF tag”, case 600 corresponds to “case”, and holding portion 610 becomes “holding portion”. The base portion 650 corresponds to the “base portion”, the first holding portion 611 corresponds to the “first holding portion”, and the second holding portion 612 corresponds to the “second holding portion”. The first base portion 651 corresponds to the “first base portion”, the second base portion 652 corresponds to the “second base portion”, and the notch portion 6H and the hole 6H correspond to the “notch portion”. The convex portion 620 and the insertion portion 620 correspond to the “convex portion”.

The preferred embodiment of the present invention is as described above, but the present invention is not limited thereto. It will be understood that various other embodiments may be made without departing from the spirit and scope of the invention. Furthermore, in this embodiment, although the effect | action and effect by the structure of this invention are described, these effect | actions and effects are examples and do not limit this invention.

DESCRIPTION OF SYMBOLS 100 RF tag 200 RF tag antenna 210 Ground part 220 Potential difference formation part 232 Spacer 400 Inductor pattern part 500 IC chip 600 Case 610 Holding part 611 1st holding part 612 2nd holding part 620 Convex part, insertion part 650 Base part 651 1st Base part 652 Second base part 6H Notch part, hole 800 Sponge member 920 Tire

Claims

An RF tag antenna used by being attached to a resin material containing carbon powder,
The RF tag antenna is
The ground,
A potential difference forming part that forms a potential difference with respect to the ground part;
An RF tag antenna including an inductor pattern portion formed in the potential difference forming portion.
The RF tag antenna according to claim 1, wherein the potential difference is 10 kΩ or more and 1 MΩ or less.
3. The RF tag antenna according to claim 1, wherein the potential difference forming portion is a flat plate having a bent portion or a curved portion with respect to the ground portion formed of a flat plate.
The RF tag antenna according to any one of claims 1 to 3, wherein the potential difference forming portion includes a spacer made of a dielectric at least in part.
The RF tag antenna according to any one of claims 1 to 4, wherein the inductor pattern portion is formed by a notch.
The RF tag antenna according to any one of claims 1 to 5, wherein the ground part and the potential difference forming part are formed of a continuous flat plate.
The RF tag antenna according to any one of claims 1 to 6, wherein an element length of the potential difference forming unit is λ / 4 or 5λ / 8 in the case of a target wavelength λ.
An RF tag antenna according to any one of claims 1 to 7,
An RF tag including an IC chip provided on the RF tag antenna.
The RF tag according to claim 8, further comprising a case for housing the RF tag antenna.
The case has a holding part that can hold the RF tag antenna, and a base part that can be bent to the holding part,
The holding unit includes a first holding unit and a second holding unit extending from the first holding unit,
The base portion includes a first base portion and a second base portion extending from the first base portion,
The first holding part and the first base part are connected, and the second holding part and the second base part are separated,
By grounding the first holding part and the first base part, the ground part of the RF tag antenna disposed between the first holding part and the first base part becomes the first holding part. The RF tag according to claim 9, wherein the RF tag is disposed between the first base portion and the first base portion, and the potential difference forming portion is attached to the second holding portion.
The case has a cutout portion formed in the second base portion and a convex portion formed in the second holding portion, and the potential difference is obtained by fitting the convex portion into the cutout portion. The RF tag according to claim 9 or 10, wherein a forming portion is formed.
The RF tag according to any one of claims 9 to 11, wherein an adhesive, an adhesive, or a double-sided tape for attaching the case to the resin material is provided on at least a part of the case.
An RF tag according to any one of claims 8 to 12,
A sponge member with an RF tag, comprising: a sponge member provided with a mounting portion for mounting the RF tag.
A sponge member with an RF tag according to claim 13,
A silent tire with an RF tag, comprising: a tire including a resin material including carbon powder to which the sponge member with an RF tag is attached.
An RF tag according to any one of claims 8 to 12,
And a tire including a resin material including carbon powder to which the RF tag is attached.
The tire with an RF tag according to claim 15, wherein the ground portion is in contact with the tire, and the potential difference forming portion is separated from an inner peripheral surface of the tire.
A tire with an RF tag according to claim 16,
A silent tire with an RF tag, comprising: a sponge member provided with a mounting portion for mounting the RF tag.