JP2004013399A - Antenna device for tire and tire with communication function - Google Patents

Antenna device for tire and tire with communication function Download PDF

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Publication number
JP2004013399A
JP2004013399A JP2002164210A JP2002164210A JP2004013399A JP 2004013399 A JP2004013399 A JP 2004013399A JP 2002164210 A JP2002164210 A JP 2002164210A JP 2002164210 A JP2002164210 A JP 2002164210A JP 2004013399 A JP2004013399 A JP 2004013399A
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JP
Japan
Prior art keywords
tire
point
electrode
belt
antenna
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2002164210A
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Japanese (ja)
Inventor
Shiro Kano
Shigeo Miyagawa
Yuji Sakurai
加納 史朗
宮川 重雄
櫻井 雄司
Original Assignee
Yamatake Corp
株式会社山武
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yamatake Corp, 株式会社山武 filed Critical Yamatake Corp
Priority to JP2002164210A priority Critical patent/JP2004013399A/en
Publication of JP2004013399A publication Critical patent/JP2004013399A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00Details of, or arrangements associated with, antennas
    • H01Q1/12Supports; Mounting means
    • H01Q1/22Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2241Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in or for vehicle tyres
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60CVEHICLE TYRES; TYRE INFLATION; TYRE CHANGING OR REPAIRING; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C23/00Devices for measuring, signalling, controlling, or distributing tyre pressure or temperature, specially adapted for mounting on vehicles; Arrangement of tyre inflating devices on vehicles, e.g. of pumps, of tanks; Tyre cooling arrangements
    • B60C23/02Signalling devices actuated by tyre pressure
    • B60C23/04Signalling devices actuated by tyre pressure mounted on the wheel or tyre
    • B60C23/0491Constructional details of means for attaching the control device
    • B60C23/0493Constructional details of means for attaching the control device for attachment on the tyre

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna device for a tire and the tire having a communication function for improving communication performance between a communication device arranged in the tire and a communication device of an external part. <P>SOLUTION: This antenna device for the tire allows a part of a belt 2 installed over the whole periphery of the tire 100 to function as a loop antenna. Thus, a point C and a point D being an optional point of the belt 2 are connected by bypass wiring 82. A communication circuit part 81 is connected to this bypass wiring 82. A magnetic substance 83 is arranged in the vicinity of the belt 2 between the point C and the point D. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a tire antenna device attached to a tire, and a tire with a communication function including the tire antenna device.
[0002]
[Prior art]
2. Description of the Related Art In the related art, a transponder is embedded in a tire in order to obtain temperature and internal pressure information on the tire. For example, this prior art is disclosed in Japanese Patent Application Laid-Open No. Hei 9-136517. In this conventional technique, a transponder main body is provided on an inner peripheral surface of a tire. A receiving antenna and a transmitting antenna are provided in the transponder main body.
[0003]
[Problems to be solved by the invention]
The antenna of a communication device such as a transponder provided on a conventional tire is small in size, has a short communication distance, and information may not be appropriately transmitted in communication with an external communication device.
[0004]
On the other hand, it is difficult to newly provide a large antenna inside the tire because it has an adverse effect on strength and balance.
[0005]
The present invention has been made to solve such a problem, and has a tire antenna device and a communication function capable of improving the communication performance between a communication device provided on a tire and an external communication device. The purpose is to provide tires.
[0006]
[Means for Solving the Problems]
The tire antenna device according to the present invention includes a belt attached around the entire circumference of the tire, a bypass wire connected to first and second points that are arbitrary points on the belt, A communication circuit connected thereto; and a magnetic body provided near the belt between the first point and the second point. With such a configuration, a part of the belt can function as a loop antenna without impairing the function of the belt.
[0007]
Another antenna device for a tire according to the present invention includes a belt attached around the entire circumference of the tire, and a belt which is located near each of a first point and a second point which are arbitrary points on the belt. A first electrode and a second electrode provided at positions separated from the first electrode and the second electrode, a bypass wiring connected to the first electrode and the second electrode, a communication circuit unit connected to the bypass wiring, A magnetic body provided in the vicinity of the belt between the first point and the second point, between the first electrode and the first point of the belt and between the second electrode and the second electrode; The belt is configured to be electrostatically coupled between the second points. Even with such a configuration, a part of the belt can function as a loop antenna without impairing the function of the belt. Further, since the belt and the bypass wiring are not directly connected, the manufacture becomes easy. In particular, by providing electrodes, bypass wiring, and a communication circuit unit on the inner peripheral surface of a normal tire, a loop antenna can be configured by so-called retrofitting.
[0008]
At the first point and the second point in the above-described tire antenna device, a third electrode and a fourth electrode are provided, respectively, between the first electrode and the third electrode, and between the first electrode and the third electrode. The second electrode and the fourth electrode may be electrostatically coupled. With such a configuration, the degree of electrostatic coupling can be increased.
[0009]
Further, the bypass wiring may include a capacitor.
[0010]
Further, the inductance of the belt in a range between the first point and the second point and in which the magnetic material is provided in the vicinity is represented by L ′, the impedance of the communication circuit unit and the impedance of the bypass wiring is represented by Z, When the communication frequency of the circuit unit is ω, it is preferable to set ωL ′ to be sufficiently higher than Z. Thereby, the communication function of the loop antenna can be improved.
[0011]
Further, the capacitance generated between the first electrode and the first point of the belt is C, the capacitance generated between the second electrode and the second point of the belt is C ′, When the communication frequency of ω is ω, both 1 / ωC and 1 / ωC ′ may be set to be sufficiently small. Thereby, the communication function of the loop antenna can be improved.
Further, when the inductance of the belt between the first point and the second point and other than the range in which the magnetic body is provided in the vicinity is L, the capacitances C and C ′ are communicated with the inductance L. It is preferable to set so as to resonate in series with the communication frequency ω of the circuit section. Thereby, the communication function of the loop antenna can be improved.
[0012]
Further, when the inductance of the belt in a range between the first point and the second point and in which the magnetic body is provided in the vicinity is L ′ and the capacitance of the capacitor is C ″, A loop formed by the belt, the bypass wiring, and the communication circuit section between the point 1 and the second point and in which the magnetic body is provided in the vicinity is parallel to the communication frequency ω of the communication circuit section. L ′ and C ″ may be set so as to resonate. Thereby, the communication function of the loop antenna can be improved.
[0013]
Here, the belt may be configured in a mesh shape. Thereby, the effect of improving the inductance by the magnetic material can be enhanced.
[0014]
Further, it is desirable that the magnetic body be provided on both the inner circumference and the outer circumference of the belt between the first point and the second point. Thereby, the effect of improving the inductance by the magnetic material can be enhanced.
[0015]
The magnetic material may be formed by applying a magnetic paint to the belt between the first point and the second point. In the case of such a configuration, manufacture becomes easy.
[0016]
The communication circuit unit in a preferred embodiment is formed of a ball semiconductor having an antenna coil built therein, and a coil is formed in a part of the bypass wiring.
[0017]
Another tire antenna device according to the present invention is a tire antenna device attached to an inner peripheral surface of a tire, and includes a first electrode, a second electrode, the first electrode, and the second electrode. A bypass line connected to the electrode, a communication circuit unit connected to the bypass line, a magnetic body disposed between the first electrode and the second electrode, the first electrode, And a sheet-like member to which the magnetic body is attached. Thereby, a loop antenna can be easily configured.
[0018]
An adhesive may be applied to one surface of the sheet member. This facilitates mounting on the tire.
[0019]
Further, the sheet-like member may have flexibility. Thereby, it can be attached according to the shape of the tire.
[0020]
Another tire antenna device according to the present invention includes a carcass cord attached around the entire circumference of the tire, a bypass wiring connected to a first point and a second point that are arbitrary points of the carcass cord, A communication circuit unit connected to the bypass wiring; and a magnetic body provided near the carcass cord between the first point and the second point. With such a configuration, a part of the carcass cord can be made to function as a loop antenna without impairing the function of the carcass cord.
[0021]
Another tire antenna device according to the present invention is a carcass cord attached to the circumference of the tire, and near each of a first point and a second point which are arbitrary points of the carcass cord, A first electrode and a second electrode provided at separated positions, a bypass wiring connected to the first electrode and the second electrode, a communication circuit unit connected to the bypass wiring, A magnetic body provided in the vicinity of the carcass cord between a first point and the second point, wherein a magnetic body is provided between the first electrode and the first point of the carcass cord and the second electrode; A portion between the second points of the carcass cord is electrostatically coupled. With such a configuration, a part of the carcass cord can be made to function as a loop antenna without impairing the function of the carcass cord. Further, since the carcass cord and the bypass wiring are not directly connected, the manufacture becomes easy. In particular, by providing electrodes, bypass wiring, and a communication circuit unit on the inner peripheral surface of a normal tire, a loop antenna can be configured by so-called retrofitting.
[0022]
Here, a third electrode and a fourth electrode are provided at the first point and the second point, respectively, between the first electrode and the third electrode, and between the first electrode and the third electrode. The electrode and the fourth electrode may be electrostatically coupled. With such a configuration, the degree of electrostatic coupling can be increased.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
First Embodiment of the Invention
First, a system configuration example of an information acquisition system to which the tire antenna device according to the first embodiment of the present invention is applied will be described with reference to FIG. However, the application target of the tire antenna device according to the present invention is not limited to the information acquisition system described here. This information acquisition system is usually realized in a four-wheeled vehicle. However, the information acquisition system can be realized even with a vehicle other than a four-wheeled vehicle, and can be realized with a single vehicle or a three-wheeled vehicle. In the embodiment of the present invention, an automobile with a gasoline engine running on a road is assumed. However, the present invention is not limited to this, and an electric engine or a hybrid engine may be used. It is applicable to trains and even airplanes.
[0024]
The tire 100 includes an information acquisition device 800. The information acquisition device 800 can communicate with the transceiver 300 via the transmission / reception antenna 200. The transceiver 300 is provided near the tire 100 of the vehicle body. The transceiver 300 is connected to the vehicle body-side control device 400 in a communicable state by wire or wirelessly. The vehicle body side control device 400 is further connected to the output device 500.
[0025]
The tire 100 is a pneumatic tire. In the first embodiment of the present invention, an example of a tubeless tire will be described, but a tubed tire may be used. The specific structure of the tire 100 will be described later.
[0026]
The information acquisition device 800 is a device that measures information such as the pressure, temperature, and gas type in the tire 100. The information acquisition device 800 transmits the acquired measurement information to the transceiver 300 wirelessly. The information acquisition device 800 includes a power supply. However, when the information acquisition device 800 is configured by an RFID such as a ball semiconductor, the information acquisition device 800 may be configured to be supplied with power from the transceiver 300 without having a power supply.
[0027]
The transceiver 300 receives the information such as the pressure acquired by the information acquisition device 800 and outputs the information to the vehicle body side control device 400. The transceiver 300 includes, for example, a transmitter having a transmitter, a receiver having a receiver and an A / D conversion circuit, a controller having a CPU and a memory, a power supply, and the like. The transceiver 300 can transmit an unmodulated wave to supply power to the information acquisition device 800, or can transmit an information acquisition command signal for instructing information acquisition.
[0028]
The vehicle body side control device 400 receives information output from the transceiver 300 and performs a predetermined process based on the information. For example, when the information is the pressure information of the tire 100, it is compared whether or not the tire pressure is equal to or less than a predetermined value. When the information is equal to or less than the predetermined value, a warning is output from the output device 500.
[0029]
The output device 500 is a display or a speaker provided in front of the driver's seat of the automobile, and outputs a warning and measurement information.
[0030]
FIG. 2 is a schematic diagram of a tire with a communication function according to the present invention. The belt 2 is provided on the tire 100 over the entire circumference. This belt 2 is a reinforcing band stretched in the circumferential direction between the tread and the carcass cord. Further, the belt 2 tightens the carcass cord strongly like a tub to increase the rigidity of the tread. The belt 2 is usually composed of one or more layers, and is composed of an organic fiber cord or a steel cord. However, the belt 2 according to the embodiment of the present invention has at least one layer having conductivity. Further, the shape of the belt 2 is preferably a mesh shape, that is, a mesh shape. This is because, when a part of the belt 2 functions as a loop antenna, the mesh shape improves the efficiency of magnetic flux coupling with a magnetic body described later and can enhance the communication function as an antenna.
[0031]
A part of the conductive belt 2 is connected to the bypass wiring 82. As shown in FIG. 2, points C and D on the belt 2 are connected to the bypass wiring 82. The bypass wiring 82 and the belt 2 are connected in parallel. A communication circuit unit 81 is provided in series with the bypass wiring 82.
[0032]
The communication circuit unit 81 forms a part of the information acquisition device 800 illustrated in FIG. 1 and has a communication function of performing communication by transmitting and receiving a high-frequency wireless signal. The communication circuit section 81 may include, for example, a sensor that measures information such as a pressure, a temperature, and a gas type in the tire 100. The communication circuit section 81 may simply store identification information, history information, sales information, and the like in a state that can be read from the outside. The communication circuit section 81 in this example includes a power supply. However, a configuration in which power is supplied from the transceiver 300 may be adopted.
[0033]
A magnetic body 83 is provided along the belt 2 between the points C and D on the belt 2. The magnetic body 83 is provided to electrically close a part of the belt 2. By making a part of the belt 2 electrically close to the cutoff state, the belt 2 can function as a loop antenna of the communication circuit unit 81. More precisely, a loop antenna is formed by the portion of the belt 2 where the magnetic body 83 is not provided and the bypass wiring 82. Here, it is possible to function as a loop antenna by physically blocking the belt 2 or by using a part of the belt as an insulator. However, in this case, the strength of the belt 2 is reduced, and the belt 2 is used as a reinforcing band. Function is significantly reduced. For this reason, in the present invention, a part of the belt 2 is brought into a state close to being electrically cut off by providing the magnetic body 83 without changing the belt 2 itself. In the description of the embodiment of the present invention, a portion provided with the magnetic material 83 between the points C and D of the belt 2 is defined as the belt 2a, and a portion provided with no magnetic material 83 is defined as the belt 2b. And
[0034]
Here, it is desirable to determine the positions of the points C and D so that the length of the belt 2b is longer than the length of the belt 2a. When the length of the belt 2a is long and the area of the loop formed by the belt 2a, the communication circuit unit 81, and the bypass wiring 82 is increased, this part functions as a loop antenna, and the belt 2b, which should originally function as a loop antenna, This is because communication by the loop constituted by the circuit portion 81 and the bypass wiring 82 is obstructed.
[0035]
The magnetic body 83 is, for example, a rubber ferrite or a ferrite sheet. The magnetic material 83 can also be formed by applying a magnetic paint to the belt 2. Further, the magnetic material 83 can be formed by spraying ferrite beads on the belt 2. The magnetic body 83 may be in contact with the belt 2 or may be apart therefrom. Further, the magnetic body 83 may be provided on either the outer circumference or the inner circumference of the belt 2, or may be provided on both the outer circumference and the inner circumference of the belt 2. Further, the magnetic member 83 may be provided so as to surround the whole. Further, the magnetic body 83 may be provided between the belts 2 having a plurality of layers.
[0036]
FIG. 3 shows an equivalent circuit of the tire according to the present invention. In this circuit, the impedance of the communication circuit section 81 and the bypass wiring 82 is Z, the inductance of the belt 2a is L ', and the inductance of the belt 2b is L. Assuming that the communication frequency of the communication circuit unit 81 is ω, ωL ′ is sufficiently larger than the impedance Z of the communication circuit unit 81. In this case, a larger amount of current flows in the path of the bypass wiring 82 and the communication circuit unit 81 than in the belt 2a, and the loop formed by the bypass wiring 82, the communication circuit unit 81, and the belt 2b functions as a loop antenna. I do.
[0037]
4 and 5 are half sectional views of the tire with a communication function according to the present invention. FIG. 4 shows a cross section taken along the line AA in FIG. 2, and FIG. 5 shows a cross section taken along the line BB in FIG. As shown in the figure, the tire 100 includes a cap tread 1, a belt 2, a side tread 3, a carcass cord 4, a beat wire 5, a finishing 6, a bead portion 7, an IC chip 8, and an antenna 9.
[0038]
Here, the carcass cord 4 is a cord layer made of fiber or steel covered with rubber, and the cords are laminated diagonally or radially to form a tire skeleton.
[0039]
As shown in FIG. 4, the tire with the communication function in the cross section taken along the line AA is in contact with the lower surface of the lower layer of the two-layer belt 2 with the bypass wiring 82. In this example, the bypass wiring 82 has a large contact area with the belt 2. Further, the lower end of the bypass wiring 82 is connected to the communication circuit section 81. The communication circuit section 81 is adhered to the inner peripheral surface of the tire with an adhesive or the like.
[0040]
As shown in FIG. 5, the tire with a communication function in the cross section taken along the line BB includes a magnetic body 83 provided below the lower layer of the two-layer belt 2 and substantially parallel to the lower layer. The magnetic body 83 extends over substantially the same width as the belt 2.
[0041]
FIG. 6 is a configuration diagram of the tire with a communication function according to the present invention as viewed from the outside. As shown in the figure, a magnetic body 83 is located in the lowermost layer, and a lower layer 22 of the belt 2 is provided on the upper layer, and an upper layer 21 of the belt 2 is provided on the upper layer. The upper layer 21 of the belt 2 is composed of a plurality of steel cords 210, and the lower layer 22 is composed of a plurality of steel cords 220.
[0042]
As described above, the tire with the communication function according to the first embodiment of the present invention allows a part of the belt to function as a loop antenna without impairing the function of the belt.
[0043]
Embodiment 2 of the invention
In the tire with a communication function according to the second embodiment of the present invention, the belt 2 and the bypass wiring 2 are connected by electrostatic coupling without physical contact. For this reason, as shown in FIG. 7, electrodes 85 are provided at two places on the belt 2, and electrodes 84 having physical contact with the bypass wiring 2 are provided near the electrodes 85 and inside the belt 2. Is provided. In such a configuration, the electrode 84 and the electrode 85 are located apart from each other by a predetermined distance, and are connected by electrostatic coupling. The space between these electrodes 84 and 85 is filled with rubber of the tire. Each of the electrodes 84 and 85 is a flat plate made of a conductive material, and preferably has a certain area or more in order to increase the degree of electrostatic coupling. Note that the electrode 85 is not necessarily required, and an electrostatic coupling may be generated between the electrode 84 and the belt 2.
[0044]
Also in the second embodiment of the present invention, a magnetic body 83 is provided inside the belt 2 as in the first embodiment of the present invention. This magnetic body 83 is the same as in the first embodiment of the invention, and includes various modifications described in the first embodiment of the invention. The other configuration is the same as that of the first embodiment of the present invention, and the description is omitted.
[0045]
According to such a configuration, since the belt 2 and the bypass wiring 82 are not directly connected, the manufacturing is facilitated. In particular, when the electrode 85 does not exist, the communication function according to the second embodiment of the present invention is provided by so-called retrofitting by providing the electrode 84, the bypass wiring 82, and the communication circuit unit 81 on the inner peripheral surface of a normal tire. A tire with a tire can be formed. In addition, when the communication circuit unit 81 or the like breaks down, replacement becomes easy.
[0046]
FIG. 8 shows an equivalent circuit of the tire according to the second embodiment of the present invention. In this circuit, the impedance of the communication circuit section 81 and the bypass wiring 82 is Z, the inductance of the belt 2a is L ', and the inductance of the belt 2b is L. Further, the capacitance between the electrode 84 and the electrode 85 is represented by C and C ′. Assuming that the communication frequency of the communication circuit unit 81 is ω, ωL ′ is sufficiently larger than the impedance Z of the communication circuit unit 81. In this way, a larger amount of current flows in the path of the bypass wiring 82 and the communication circuit section 81 than in the belt 2a, and the circuit formed by the bypass wiring 82, the communication circuit section 81, and the belt 2b functions as a loop antenna. I do. Further, it is preferable that 1 / ωC and 1 / ωC ′ be sufficiently small.
[0047]
Although the electrodes 84 are provided at both ends of the bypass wiring 82 in this example, the electrodes 84 may be provided only at one end, and the other end may be directly connected to the belt 2.
[0048]
Embodiment 3 of the Invention
In the tire with the communication function according to the third embodiment of the present invention, similarly to the second embodiment of the present invention, the belt 2 and the bypass wiring 82 are connected by an electrostatic coupling without making physical contact. I have. For this reason, as shown in FIG. 9, electrodes 85 are provided at two places on the belt 2, and electrodes 84 having physical contact with the bypass wiring 2 are provided near the electrodes 85 and inside the belt 2. Is provided.
[0049]
Also in the second embodiment of the present invention, a magnetic body 83 is provided inside the belt 2 as in the first embodiment of the present invention. This magnetic body 83 is the same as in the first embodiment of the invention, and includes various modifications described in the first embodiment of the invention. The other configuration is the same as that of the first embodiment of the present invention, and the description is omitted.
[0050]
According to such a configuration, since the belt 2 and the bypass wiring 82 are not directly connected, the manufacturing is facilitated. In particular, when the electrode 85 does not exist, the communication function according to the second embodiment of the present invention is provided by so-called retrofitting by providing the electrode 84, the bypass wiring 82, and the communication circuit unit 81 on the inner peripheral surface of a normal tire. A tire with a tire can be formed.
[0051]
Further, in the third embodiment of the present invention, the capacitor 81 is provided on the bypass wiring 82 so as to be parallel to the communication circuit section 81.
[0052]
FIG. 10 shows an equivalent circuit of the tire according to the third embodiment of the present invention. In this circuit, the impedance of the communication circuit section 81 is Z, the inductance of the belt 2a is L ', and the inductance of the belt 2b is L. Further, the capacitance between the electrode 84 and the electrode 85 is represented by C and C ′. Further, the capacitance of the capacitor 86 is represented by C ″. Assuming that the communication frequency of the communication circuit unit 81 is ω, ωL ′ is sufficiently larger than the impedance Z of the communication circuit unit 81. In this way, a larger amount of current flows in the path of the bypass wiring 82 and the communication circuit section 81 than in the belt 2a, and the circuit formed by the bypass wiring 82, the communication circuit section 81, and the belt 2b functions as a loop antenna. I do. Also, 1 / ωC and 1 / ωC 'are set to be sufficiently small. By setting like this
[0053]
Further, C + C ′ + C ″ may be resonated in parallel with L ′. With this setting, the impedance of the belt 2a can be increased, and the function of the loop constituted by the belt 2b, the communication circuit unit 81, and the bypass wiring 82 as an antenna can be improved. The condition of resonance is L'ω = 1 / Ceff
[0054]
・ It is ω. Here, Ceff can be expressed as follows.
1 / Ceff = 1 / C + 1 / C '+ 1 / C "
[0055]
Further, it is more preferable to set C and C 'so as to resonate in series with L.
[0056]
In the third embodiment of the present invention, a capacitor 86 is newly provided in the configuration of the tire according to the second embodiment of the present invention. However, the present invention is not limited to this, and the configuration of the tire according to the first embodiment of the present invention is not limited thereto. , A new capacitor 86 may be provided.
[0057]
Embodiment 4 of the Invention
Embodiment 4 of the present invention relates to a member for configuring the tire with information function according to Embodiment 3 of the present invention by so-called retrofitting. FIG. 11 shows a configuration example of this member. As shown in the figure, the above-described communication circuit section 81, bypass wiring 82, magnetic body 83, electrode 84, and capacitor 86 are all provided on the upper surface of the sticking sheet 87. The lower surface of the attachment sheet 87 is attached to the inner peripheral surface of the tire 100. For example, the attachment sheet 87 and the inner peripheral surface of the tire 100 are attached with an adhesive. At this time, an adhesive may be applied in advance to the lower surface of the sticking sheet 87 to form a seal. The sticking sheet 87 has flexibility and is made of, for example, a material such as vinyl or cellophane. According to the preferred embodiment, the bypass wiring 82, the magnetic body 83, the electrode 84, and the like also have flexibility.
[0058]
By attaching such an adhesive sheet 87 to the inner peripheral surface of the tire 100, a part of the belt 2 can function as a loop antenna. In particular, according to the embodiment of the present invention, since a part for causing a part of the belt 2 to function as a loop antenna is integrated with the sticking sheet 87, it can be simply attached to the inner peripheral surface of the tire 100. Good is very easy to manufacture.
[0059]
In this example, a part for making a part of the belt 2 function as a loop antenna is provided on the surface of the sticking sheet 87 opposite to the surface bonded to the inner peripheral surface of the tire. It may be provided on a surface that is bonded to the inner peripheral surface of the tire. Further, some parts may be provided on the surface that is bonded to the inner peripheral surface of the tire, and the remaining parts may be provided on the opposite surface. Furthermore, when the attachment sheet 87 has a multilayer structure, these components may be arranged between the layers.
[0060]
Embodiment 5 of the Invention
The tire with a communication function according to the fifth embodiment of the present invention is characterized in that the magnetic members 83a and 83b are provided on both the inner circumference and the outer circumference of a part of the belt 2. FIG. 12 is a half sectional view of a tire with a communication function according to a fifth embodiment of the present invention. In this example, a magnetic body 83 a having substantially the same width as the belt 2 is provided outside the belt 2, and a magnetic body 83 b having substantially the same width as the belt 2 is provided inside the belt 2.
[0061]
With such a configuration, a part of the belt 2 can be effectively brought into a state close to blocking.
[0062]
Embodiment 6 of the Invention
In the tire with a communication function according to the sixth embodiment of the present invention, a part of the carcass cord 4 functions as a loop antenna. For this reason, the carcass cord 4 is made of a conductive material.
[0063]
The configuration of the tire with a communication function according to the sixth embodiment of the present invention is basically such that the connection destination of the bypass wiring 2 is the carcass cord 4 and the magnetic material 83 is provided near the carcass cord 4. Except for this point, the third embodiment is the same as the first to fifth embodiments.
[0064]
FIG. 13 is a half sectional view of a portion where the bypass wiring 82 is connected to the carcass cord 4. As shown in the figure, the communication circuit section 81 is provided on the inner peripheral surface of the tire 100. Further, a bypass wiring 4 is provided between the communication circuit section 81 and the carcass cord 4 to connect the two.
[0065]
FIG. 14 is a half sectional view of a portion where the magnetic body 83 is provided near the carcass cord 4. As shown in the figure, a magnetic body 83 is provided along the entire length of the carcass cord 4 and inside thereof.
[0066]
With such a configuration, a part of the carcass cord can function as a loop antenna.
[0067]
Other embodiments of the invention.
As shown in FIG. 15, the communication circuit section 81 may be constituted by a ball semiconductor 88 having a built-in antenna coil. In this case, instead of the bypass wiring 2, a coil may be formed near the ball semiconductor 88, and both ends thereof may be connected to the belt 2 or the carcass cord 4.
[0068]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the antenna device for tires which can improve the communication performance of the communication apparatus provided in the tire and the external communication apparatus, and the tire which has a communication function can be provided.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an information acquisition system according to the present invention.
FIG. 2 is a schematic view of a tire with a communication function according to the present invention.
FIG. 3 is an equivalent circuit of a tire with a communication function according to the present invention.
FIG. 4 is a half sectional view of a tire with a communication function according to the present invention.
FIG. 5 is a half sectional view of a tire with a communication function according to the present invention.
FIG. 6 is a top view of the tire with a communication function according to the present invention.
FIG. 7 is a schematic diagram of a tire with a communication function according to the present invention.
FIG. 8 is an equivalent circuit of a tire with a communication function according to the present invention.
FIG. 9 is a schematic diagram of a tire with a communication function according to the present invention.
FIG. 10 is an equivalent circuit of a tire with a communication function according to the present invention.
FIG. 11 is a configuration diagram of a member attached to a tire with a communication function according to the present invention.
FIG. 12 is a half sectional view of a tire with a communication function according to the present invention.
FIG. 13 is a half sectional view of a tire with a communication function according to the present invention.
FIG. 14 is a half sectional view of a tire with a communication function according to the present invention.
FIG. 15 is a schematic diagram of a tire with a communication function according to the present invention.
[Explanation of symbols]
100 tires
200 transmitting / receiving antenna
300 transceiver
2 belts
4 Carcass cord
81 Communication circuit
82 Bypass circuit
83 magnetic material
84 electrodes
85 electrodes
86 capacitor
87 Paste sheet
88 ball semiconductor

Claims (19)

  1. A belt attached around the entire circumference of the tire,
    A bypass wiring connected to a first point and a second point which are arbitrary points of the belt;
    A communication circuit unit connected to the bypass wiring,
    An antenna device for a tire, comprising: a magnetic body provided in the vicinity of a belt between the first point and the second point.
  2. A belt attached around the entire circumference of the tire,
    A first electrode and a second electrode provided near the first point and the second point, which are arbitrary points on the belt, and provided at positions separated from the belt;
    A bypass wiring connected to the first electrode and the second electrode;
    A communication circuit unit connected to the bypass wiring,
    A magnetic body provided near the belt between the first point and the second point,
    An antenna device for a tire in which a portion between the first electrode and a first point of the belt and a portion between the second electrode and a second point of the belt are electrostatically coupled.
  3. A third electrode and a fourth electrode are provided at the first point and the second point, respectively.
    3. The tire antenna device according to claim 2, wherein a portion between the first electrode and the third electrode and a portion between the second electrode and the fourth electrode are electrostatically coupled. .
  4. 4. The tire antenna device according to claim 1, wherein the bypass wiring includes a capacitor.
  5. The inductance of the belt in a range between the first point and the second point and in which the magnetic body is provided in the vicinity is L ′, the impedance of the communication circuit unit and the impedance of the bypass wiring is Z, and the communication circuit unit is The antenna device for a tire according to any one of claims 1 to 4, wherein ωL 'is set to be sufficiently higher than Z when the communication frequency of the tire is ω.
  6. The capacitance generated between the first electrode and the first point of the belt is C, the capacitance generated between the second electrode and the second point of the belt is C ′, and the capacitance of the communication circuit unit is 5. The tire antenna device according to claim 2, wherein 1 / ωC and 1 / ωC ′ are both set to be sufficiently small when the communication frequency is ω.
  7. The inductance of the belt between the first point and the second point and outside the range where the magnetic material is provided in the vicinity is represented by L, and the inductance is generated between the first electrode and the first point of the belt. When the capacitance is C and the capacitance generated between the second electrode and the second point of the belt is C ′, the capacitances C and C ′ are changed to the inductance L and the communication frequency ω of the communication circuit unit. 7. The tire antenna device according to claim 2, wherein the tire is set to perform series resonance.
  8. When the inductance of the belt in a range between the first point and the second point and in which the magnetic material is provided in the vicinity is L ′ and the capacitance of the capacitor is C ″, the first point And a loop formed by the belt, the bypass wiring, and the communication circuit portion in a range between the second point and the magnetic material provided in the vicinity thereof so as to resonate in parallel with the communication frequency ω of the communication circuit portion. 5. The antenna device for a tire according to claim 4, wherein L 'and C' 'are set for the tire antenna.
  9. The tire antenna device according to any one of claims 1 to 8, wherein the belt is configured in a mesh shape.
  10. The tire antenna device according to any one of claims 1 to 9, wherein the magnetic body is provided on both the inner circumference and the outer circumference of the belt between the first point and the second point.
  11. The tire antenna according to any one of claims 1 to 9, wherein the magnetic body is configured by applying a magnetic paint to a belt between the first point and the second point. apparatus.
  12. The antenna device for a tire according to any one of claims 1 to 11, wherein the communication circuit unit is configured by a ball semiconductor including an antenna coil, and a coil is formed in a part of the bypass wiring.
  13. An antenna device for a tire attached to an inner peripheral surface of a tire,
    A first electrode;
    A second electrode;
    A bypass wiring connected to the first electrode and the second electrode;
    A communication circuit unit connected to the bypass wiring,
    A magnetic body disposed between the first electrode and the second electrode;
    An antenna device for a tire, comprising: the first electrode, the second electrode, the bypass wiring, the communication circuit unit, and a sheet-shaped member to which the magnetic body is attached.
  14. The tire antenna device according to claim 13, wherein an adhesive is applied to one surface of the sheet-shaped member.
  15. The tire antenna device according to claim 13, wherein the sheet-shaped member has flexibility.
  16. A carcass cord attached around the entire circumference of the tire,
    A bypass wiring connected to a first point and a second point which are arbitrary points of the carcass cord;
    A communication circuit unit connected to the bypass wiring,
    An antenna device for a tire, comprising: a magnetic body provided near a carcass cord between the first point and the second point.
  17. A carcass cord attached to the circumference of the tire,
    A first electrode and a second electrode which are provided in the vicinity of the first point and the second point, which are arbitrary points of the carcass cord, and which are provided at separated positions;
    A bypass wiring connected to the first electrode and the second electrode;
    A communication circuit unit connected to the bypass wiring,
    A magnetic body provided near the carcass cord between the first point and the second point,
    A tire antenna device in which a portion between the first electrode and a first point of the carcass cord and a portion between the second electrode and a second point of the carcass cord are electrostatically coupled.
  18. A third electrode and a fourth electrode are provided at the first point and the second point, respectively.
    18. The tire antenna device according to claim 17, wherein a portion between the first electrode and the third electrode and a portion between the second electrode and the fourth electrode are electrostatically coupled. .
  19. A tire with a communication function, comprising the antenna device for a tire according to claim 1.
JP2002164210A 2002-06-05 2002-06-05 Antenna device for tire and tire with communication function Pending JP2004013399A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002164210A JP2004013399A (en) 2002-06-05 2002-06-05 Antenna device for tire and tire with communication function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002164210A JP2004013399A (en) 2002-06-05 2002-06-05 Antenna device for tire and tire with communication function

Publications (1)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004058997A (en) * 2002-07-24 2004-02-26 Goodyear Tire & Rubber Co:The Annular antenna and transponder device, and method for disposing them in pneumatic tire
JP2006048699A (en) * 2004-08-04 2006-02-16 Liebherr Werk Ehingen Gmbh Position sensor for movable guided member
JP2006064565A (en) * 2004-08-27 2006-03-09 Sumitomo Electric Ind Ltd Tire sensor unit, tire state detection device, and tire
JP2013126838A (en) * 2011-12-19 2013-06-27 Toppan Forms Co Ltd Tire
JP2018012485A (en) * 2016-07-20 2018-01-25 明泰科技股▲分▼有限公司 Self-monitoring tire of vehicle
WO2019244779A1 (en) * 2018-06-22 2019-12-26 株式会社ブリヂストン Pneumatic tire
EP3632705A1 (en) 2018-10-03 2020-04-08 Toyo Tire Corporation Tire and tire manufacturing method

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004058997A (en) * 2002-07-24 2004-02-26 Goodyear Tire & Rubber Co:The Annular antenna and transponder device, and method for disposing them in pneumatic tire
JP4585183B2 (en) * 2002-07-24 2010-11-24 ザ・グッドイヤー・タイヤ・アンド・ラバー・カンパニーThe Goodyear Tire & Rubber Company Annular antenna and transponder device and method for placing them in a pneumatic tire
JP2006048699A (en) * 2004-08-04 2006-02-16 Liebherr Werk Ehingen Gmbh Position sensor for movable guided member
JP2006064565A (en) * 2004-08-27 2006-03-09 Sumitomo Electric Ind Ltd Tire sensor unit, tire state detection device, and tire
JP4713863B2 (en) * 2004-08-27 2011-06-29 住友ゴム工業株式会社 Tire sensor unit, tire state detection device, and tire
JP2013126838A (en) * 2011-12-19 2013-06-27 Toppan Forms Co Ltd Tire
JP2018012485A (en) * 2016-07-20 2018-01-25 明泰科技股▲分▼有限公司 Self-monitoring tire of vehicle
WO2019244779A1 (en) * 2018-06-22 2019-12-26 株式会社ブリヂストン Pneumatic tire
EP3632705A1 (en) 2018-10-03 2020-04-08 Toyo Tire Corporation Tire and tire manufacturing method

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