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WO2024095523A1 - Pneumatic tyre manufacturing method - Google Patents

Pneumatic tyre manufacturing method Download PDF

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Publication number
WO2024095523A1
WO2024095523A1 PCT/JP2023/022499 JP2023022499W WO2024095523A1 WO 2024095523 A1 WO2024095523 A1 WO 2024095523A1 JP 2023022499 W JP2023022499 W JP 2023022499W WO 2024095523 A1 WO2024095523 A1 WO 2024095523A1
Authority
WO
WIPO (PCT)
Prior art keywords
tag
tire
antenna
shape
rubber
Prior art date
Application number
PCT/JP2023/022499
Other languages
French (fr)
Japanese (ja)
Inventor
浩昭 大野
Original Assignee
株式会社ブリヂストン
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 株式会社ブリヂストン filed Critical 株式会社ブリヂストン
Publication of WO2024095523A1 publication Critical patent/WO2024095523A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C19/00—Tyre parts or constructions not otherwise provided for

Definitions

  • the present invention relates to a method for manufacturing pneumatic tires.
  • Patent Document 1 Pneumatic tires equipped with a communication device such as an RF (Radio Frequency) tag that has a memory for reading and writing data for manufacturing management, shipping management, usage history management, etc., of the tire are known (for example, Patent Document 1).
  • a communication device such as an RF (Radio Frequency) tag that has a memory for reading and writing data for manufacturing management, shipping management, usage history management, etc., of the tire.
  • Patent Document 2 a device has been proposed in which the antenna section has a portion in which a predetermined shape is repeatedly arranged in the extension direction while folding back and forth at the apex in a direction perpendicular to the extension direction.
  • the inventors considered fitting a communication device to a pneumatic tire, which has an antenna section that has a portion in which a predetermined shape is repeatedly arranged in the extension direction while folding back and forth at an apex in a direction perpendicular to the extension direction, and found that there are cases in which the durability of the antenna section is insufficient.
  • the present invention aims to provide a method for manufacturing pneumatic tires that can improve the durability of the antenna portion of a communication device.
  • the gist and configuration of the present invention are as follows.
  • a method for manufacturing a pneumatic tire having a built-in communication device comprising the steps of:
  • the communication device has an antenna unit,
  • the antenna portion has a portion in which a predetermined shape is repeatedly arranged in the extension direction while being folded back and forth at a vertex in a direction perpendicular to the extension direction,
  • a method for manufacturing a pneumatic tire comprising: covering the antenna portion with rubber while applying tension to the outside of the antenna portion in an extension direction.
  • a method for manufacturing a pneumatic tire having a built-in communication device comprising the steps of:
  • the communication device has an antenna unit,
  • the antenna portion has a portion in which a predetermined shape is repeatedly arranged in the extension direction while being folded back and forth at a vertex in a direction perpendicular to the extension direction,
  • a method for manufacturing a pneumatic tire comprising: expanding the tire with the extension direction of the antenna portion aligned in the tire circumferential direction.
  • the present invention provides a method for manufacturing a pneumatic tire that can improve the durability of the antenna portion of a communication device.
  • FIG. 2 is a plan view of the RF tag.
  • FIG. 2 is a perspective view of the RF tag with the lid of the exterior body removed.
  • FIG. FIG. 4 is a plan view of a second antenna.
  • FIG. 2 is a partial cross-sectional view of the RF tag.
  • 1 is a cross-sectional view (half) of a pneumatic tire in the tire width direction.
  • 11 is a diagram showing a schematic diagram of a state in which tension is applied to an antenna part.
  • the method for manufacturing a pneumatic tire according to the present embodiment is a method for manufacturing a pneumatic tire having a built-in communication device, the communication device will be described first.
  • FIG. 1 is a plan view of a communication device 10.
  • a communication device is sometimes called an "RF tag.”
  • Fig. 2 is a perspective view of the RF tag 10.
  • Fig. 3 is a perspective view of the RF tag 10 with the cover of the exterior body removed.
  • Fig. 4 is an exploded perspective view of the RF tag 10.
  • Fig. 5 is a plan view of the second antenna 2.
  • Fig. 6 is a partial cross-sectional view of the RF tag 10.
  • Fig. 6 is a cross-sectional view taken along line II of Fig. 2.
  • the RF tag 10 includes a substrate 1, a second antenna 2, and an exterior body 3.
  • the longitudinal direction (left-right direction in Fig. 1) of the main surface 31a (see Fig. 3) of the exterior body 3 is called the X direction.
  • One direction of the X direction (right direction in Fig. 1) is called the +X direction.
  • the other direction of the X direction (left direction in Fig. 1) is called the -X direction.
  • the short-side direction of the main surface 31a (see Fig. 3) of the exterior body 3 is called the Y direction.
  • the Y direction is perpendicular to the X direction in a plane along the main surface 31a.
  • One direction of the Y direction (upward in Fig. 1) is called the +Y direction.
  • the other direction of the Y direction (downward in Fig. 1) is called the -Y direction.
  • the direction perpendicular to the main surface 31a of the exterior body 3 is called the Z direction.
  • the Z direction is perpendicular to the X direction and the Y direction. Viewing from the Z direction is called planar view.
  • the Z axis is the central axis along the Z direction.
  • the substrate 1 includes an RFID chip 11, a first antenna 12, and a base material 13.
  • the substrate 1 is provided with the RFID chip 11 and the first antenna 12.
  • the substrate 13 is formed in a plate shape.
  • the shape of the substrate 13 in plan view is not particularly limited, but it is preferable that at least a part of the outer periphery 13a is curved.
  • the curved shape is, for example, an elliptical arc shape, a circular arc shape, or a high-order curve shape (e.g., a quadratic curve shape).
  • the high-order curve shape is, for example, a parabola shape, a hyperbola shape, etc.
  • the outer shape of the substrate 13 in plan view may be, for example, an elliptical shape, a circular shape, an oval shape (a racetrack shape), etc. It is preferable that the outer shape of the substrate 13 in plan view is non-circular. In this embodiment, the substrate 13 is elliptical.
  • the substrate 13 is oriented so that the major axis direction faces the X direction.
  • the substrate 13 may be a glass epoxy resin substrate, a ceramic, a plastic film, or the
  • the RFID chip 11 allows for contactless writing and reading of information via the first antenna 12 and the second antenna 2.
  • the RFID chip 11 is mounted on a substrate 13.
  • the first antenna 12 is, for example, a conductive layer formed on one surface of the substrate 13.
  • the conductive layer is, for example, composed of a conductive foil, a plating layer, a conductive ink layer, etc.
  • the conductive foil is, for example, a metal foil composed of copper, silver, gold, platinum, aluminum, etc.
  • the conductive foil is formed into a predetermined shape by etching or the like.
  • the plating layer is, for example, composed of a metal such as copper, silver, gold, platinum, aluminum, etc.
  • the conductive ink layer is formed by printing or the like using a conductive ink.
  • the conductive ink contains conductive particles formed of a metal, carbon material, etc.
  • the first antenna 12 is formed in a loop shape.
  • the first antenna 12 has, for example, a curved shape that follows the outer peripheral edge 13a of the substrate 13.
  • the first antenna 12 is formed in an elliptical loop shape.
  • the first antenna 12 is electrically connected to the RFID chip 11.
  • the second antenna 2 is an antenna for the booster.
  • the second antenna 2 is, for example, a linear body.
  • the second antenna 2 is formed of a metal such as steel, stainless steel, copper, or a copper alloy.
  • the second antenna 2 can be formed of, for example, a brass-plated steel wire.
  • the second antenna 2 is separate from the substrate 1.
  • the second antenna 2 is a linear body, the second antenna may be, for example, a plate-shaped body.
  • the second antenna 2 comprises an electromagnetic field coupling portion 21 and a pair of extension portions 22.
  • the electromagnetic field coupling portion 21 has a curved shape.
  • a "curved shape” is a shape that curves smoothly without any sharp bends. Examples of curved shapes include an elliptical arc shape, a circular arc shape, and a higher-order curve shape (e.g., a quadratic curve shape). Examples of a "higher-order curve shape” include a parabola shape and a hyperbola shape.
  • the electromagnetic field coupling portion 21 is in a semi-elliptical shape.
  • the electromagnetic field coupling portion 21 is in a semi-elliptical shape that extends from one vertex of the ellipse (the vertex that intersects with the major axis) to the other vertex (the vertex that intersects with the major axis).
  • the electromagnetic field coupling portion 21 is shaped to surround at least a portion of the substrate 1 in a plan view.
  • the electromagnetic field coupling portion 21 surrounds the area (half the circumference in the +Y direction) from one vertex (the vertex intersecting with the long axis) of the elliptical substrate 1 to the other vertex (the vertex intersecting with the long axis).
  • the electromagnetic field coupling portion 21 has a curved shape (e.g., an elliptical arc shape) that follows the outer peripheral edge 12a of the first antenna 12 in a plan view. The distance between the electromagnetic field coupling portion 21 and the outer peripheral edge 12a is approximately constant.
  • the electromagnetic field coupling portion 21 is located outside the outer peripheral edge 13a of the substrate 1 and close to the outer peripheral edge 13a in a plan view.
  • the electromagnetic field coupling portion 21 has a shape that follows the outer peripheral edge 13a in a plan view. The distance between the electromagnetic field coupling portion 21 and the outer peripheral edge 13a is approximately constant.
  • the electromagnetic field coupling portion 21 is electromagnetically coupled to the first antenna 12 in a non-contact manner.
  • the electromagnetic field coupling is, for example, either electric field coupling or magnetic field coupling.
  • the shape of a cross section perpendicular to the longitudinal direction of the electromagnetic field coupling portion 21 is, for example, circular (see FIG. 6).
  • the pair of extension portions 22 extend from one and the other end 21a of the electromagnetic field coupling portion 21, respectively.
  • the first extension portion 22A which is one of the pair of extension portions 22, extends in the -X direction from the -X direction end 21a of the electromagnetic field coupling portion 21 while meandering.
  • the second extension portion 22B which is the other of the pair of extension portions 22, extends in the +X direction from the +X direction end 21a of the electromagnetic field coupling portion 21 while meandering.
  • the planar shape of the extension portion 22 is, for example, a meandering shape, a wavy shape, a zigzag shape, etc.
  • the extension portion 22 has a meandering shape.
  • the extension portion 22 has a plurality of straight portions 23 and a plurality of folded portions 24.
  • the straight portions 23 are linearly shaped along the Y direction.
  • the straight portions 23 are arranged at intervals in the X direction.
  • the folded portions 24 connect the ends of adjacent straight portions 23.
  • the folded portions 24 have a curved shape (e.g., an arc shape).
  • the straight line portion 23 closest to the electromagnetic field coupling portion 21 is referred to as the "first straight line portion 23A.”
  • the straight line portion 23 second closest to the electromagnetic field coupling portion 21 is referred to as the “second straight line portion 23B.”
  • the straight line portion 23 third closest to the electromagnetic field coupling portion 21 is referred to as the "third straight line portion 23C.”
  • the fold portion 24 connecting the first straight line portion 23A and the second straight line portion 23B is referred to as the "first fold portion 24A.”
  • the fold portion 24 connecting the second straight line portion 23B and the third straight line portion 23C is referred to as the "second fold portion 24B.”
  • the first straight portion 23A extends in the -Y direction from the end 21a of the electromagnetic field coupling portion 21.
  • the first folded portion 24A extends in a curved manner from the -Y direction end of the first straight portion 23A and reaches the -Y direction end of the second straight portion 23B.
  • the first straight portion 23A and a portion of the first folded portion 24A are inside the exterior body 3, but the remaining portion of the extension portion 22 extends outside the exterior body 3 (see Figure 3).
  • the exterior body 3 includes a plate-shaped main body 31 and a plate-shaped lid 32.
  • the exterior body 3 is generally plate-shaped.
  • the main body 31 and the lid 32 are formed of, for example, resin.
  • resins include polyamide resins such as nylon 6,6; polyester resins such as polyethylene terephthalate (PET); polyolefin resins such as polyethylene; polyethylene fluoride-based resins such as polyvinyl fluoride; vinyl polymers such as polyvinyl chloride; and acrylic resins such as polymethyl methacrylate.
  • the main body 31 has a rectangular shape in a plan view.
  • a board holding recess 37 (board holding portion), an antenna holding groove 34, and a pair of side recesses 35 are formed on the main surface 31a, which is one surface of the main body 31.
  • the board holding recess 37 is formed by the board holding protrusions 33.
  • the board holding recess 37 is a recess surrounded by the board holding protrusions 33.
  • the board holding protrusion 33 is an annular rib-shaped protrusion.
  • the board holding protrusion 33 has a curved shape (e.g., an elliptical shape) that fits along the outer peripheral edge 13a of the board 1.
  • the board holding protrusion 33 protrudes from the main surface 31a in the +Z direction.
  • the shape of a cross section perpendicular to the length direction of the board holding protrusion 33 is, for example, rectangular.
  • the board holding protrusion 33 has a curved shape (e.g., an elliptical shape) that fits along the outer peripheral edge 12a of the first antenna 12.
  • the substrate holding recess 37 holds the substrate 1.
  • the substrate holding recess 37 has a shape (e.g., an elliptical shape) that follows the outer peripheral edge 13a of the substrate 1.
  • the inner dimension (inner diameter) of the substrate holding recess 37 is approximately the same as the outer dimension (outer diameter) of the substrate 1 or is slightly larger than the outer dimension (outer diameter) of the substrate 1.
  • the substrate holding recess 37 has a similar shape to the substrate 1 in a plan view.
  • the substrate 1 and the substrate holding recess 37 are non-circular (e.g., elliptical), they can prevent the substrate 1 from tilting around the Z axis and maintain the correct posture of the substrate 1. This makes it possible to maintain the electromagnetic coupling between the first antenna 12 and the electromagnetic field coupling portion 21.
  • the antenna holding groove 34 accommodates the electromagnetic field coupling portion 21 of the second antenna 2 (see Figures 3 and 6).
  • the antenna holding groove 34 is formed outside the substrate holding protrusion 33 and close to the substrate holding protrusion 33.
  • the antenna holding groove 34 is shaped to follow the substrate holding protrusion 33 in a plan view.
  • the antenna holding groove 34 is curved (e.g., elliptical) along the outer periphery 12a of the first antenna 12 in a plan view.
  • the antenna holding groove 34 is curved (e.g., elliptical) along the outer periphery 13a of the substrate 1 in a plan view.
  • the antenna holding groove 34 is semi-elliptical in a plan view. More specifically, the antenna holding groove 34 is semi-elliptical from one vertex of the ellipse (the vertex intersecting with the long axis) to the other vertex (the vertex intersecting with the long axis).
  • the antenna holding groove 34 is shaped to surround at least a portion of the substrate 1 in a plan view.
  • the antenna holding groove 34 surrounds the area (half the circumference in the +Y direction) from one vertex (the vertex intersecting with the long axis) of the elliptical substrate 1 to the other vertex (the vertex intersecting with the long axis).
  • the cross section perpendicular to the longitudinal direction of the antenna holding groove 34 is, for example, rectangular.
  • the width (inner dimension) W1 of the antenna holding groove 34 is larger than the outer diameter (outer dimension) D1 of the electromagnetic field coupling portion 21.
  • the difference between the width W1 and the outer diameter D1 can be, for example, 0.01 mm to 1 mm (preferably 0.05 mm to 0.2 mm). Since the width W1 of the antenna holding groove 34 is larger than the outer diameter D1 of the electromagnetic field coupling portion 21, the electromagnetic field coupling portion 21 is accommodated in the antenna holding groove 34 in a state in which it can be displaced in the radial direction (for example, the Y direction).
  • the "radial direction" is the direction perpendicular to the longitudinal direction of the electromagnetic field coupling portion 21.
  • the electromagnetic field coupling portion 21 can also be displaced in the longitudinal direction relative to the antenna holding groove 34.
  • the depth of the antenna holding groove 34 is determined so that the height (inner dimension) H1 from the bottom surface 34a of the antenna holding groove 34 to the lid portion 32 (top surface 38a) is greater than the outer diameter D1 of the electromagnetic field coupling portion 21.
  • the difference between the height H1 and the outer diameter D1 can be, for example, 0.01 mm to 1 mm (preferably 0.05 mm to 0.2 mm). Because the height H1 of the antenna holding groove 34 is greater than the outer diameter D1 of the electromagnetic field coupling portion 21, the electromagnetic field coupling portion 21 is accommodated in the antenna holding groove 34 in a state in which it can be displaced in the wire diameter direction (for example, the Z direction).
  • the side recesses 35 are formed on one and the other side of the main surface 31a.
  • the side recesses 35 are formed in an area including the side edge 31b in the X direction of the main body 31.
  • the inner peripheral edge 35a of the side recess 35 has a first straight portion 35b along the Y direction, a curved portion 35c, and a second straight portion 35d along the X direction.
  • the first straight portion 35b is a portion that extends in the -Y direction starting from the end of the inner peripheral edge of the antenna holding groove 34.
  • the curved portion 35c is a portion that extends from the tip of the first straight portion 35b while the inclination angle with respect to the X direction becomes smaller.
  • the second straight portion 35d is a portion that extends from the tip of the curved portion 35c along the X direction toward the side edge 31b.
  • the side recess 35 includes the first straight portion 23A and a portion of the first folded portion 24A of the second antenna 2 in a plan view.
  • the first straight portion 23A is adjacent to the first straight portion 35b (see FIG. 4).
  • the first folded portion 24A is adjacent to the curved portion 35c (see FIG. 4).
  • the side recess 35 accommodates at least a portion of a predetermined length range of the second antenna 2 (the first straight portion 23A and a portion of the first folded portion 24A).
  • the side recess 35 is spaced a sufficient distance in the Y direction, so that the side edge 31b has a slit-shaped side end opening 36 extending in the Y direction (direction along the main surface 31a).
  • the second antenna 2 extends out of the exterior body 3 through the side end opening 36.
  • two locking recesses 39 are formed at different positions in the X direction on the +Y direction edge 31c of the main body 31.
  • Two locking recesses 39 are also formed at different positions in the X direction on the -Y direction edge 31d of the main body 31.
  • the lid portion 32 has a rectangular shape in a plan view.
  • the lid portion 32 has the same shape as the main body portion 31 and is placed opposite the main surface 31a of the main body portion 31.
  • the lid portion 32 is placed so as to overlap the main surface 31a of the main body portion 31 in a plan view.
  • the opposing surface 32a of the lid portion 32 is a surface that faces the main surface 31a of the main body portion 31.
  • a positioning groove 38 is formed in the opposing surface 32a.
  • the positioning groove 38 is an annular groove.
  • the shape of a cross section perpendicular to the longitudinal direction of the positioning groove 38 is, for example, rectangular.
  • the positioning groove 38 has a curved shape (e.g., an elliptical shape) that corresponds to the board holding protrusion 33 and the antenna holding groove 34.
  • the positioning groove 38 has a width that collectively encompasses the board holding protrusion 33 and the antenna holding groove 34.
  • a portion of the top surface 38a of the positioning groove 38 faces the bottom surface 34a of the antenna holding groove 34.
  • two locking protrusions 40 are formed at different positions in the X direction on the +Y edge 32c of the lid 32.
  • Two locking protrusions 40 are also formed at different positions in the X direction on the -Y edge 32d of the lid 32.
  • the locking protrusion 40 has a locking claw portion (not shown) formed at its tip.
  • the locking protrusion 40 is inserted into the locking recess 39 of the main body 31.
  • the locking claw portion of the locking protrusion 40 locks into the main body 31. This allows the lid 32 to be detachably connected to the main body 31.
  • the exterior body 3 is not fixed to the second antenna 2. In other words, the exterior body 3 is not fixed to the second antenna 2.
  • the RF tag 10 can be installed in a molded product made of, for example, rubber, resin, etc.
  • the RF tag 10 can be embedded in the molded product.
  • the molded product is, for example, an elastic body and can be elastically deformed. When the molded product is stretched, bent, or otherwise deformed, an external force may act on the second antenna 2. For example, a tensile force may act on the extension 22 in the X direction away from the exterior body 3. A force may also act on the extension 22 in the X direction toward the exterior body 3.
  • the RF tag 10 when the RF tag 10 is installed in a tire, the RF tag 10 can be provided so as to be encapsulated in a fixing member (lamination rubber) made of a rubber sheet. This not only reliably prevents damage to the RF tag 10, but also allows the RFID tag 10 to be easily incorporated into the tire 1 without risk of damage if the RF tag 10 is encapsulated in a fixing member before being incorporated into the tire.
  • the electromagnetic field coupling portion 21 of the second antenna 2 is accommodated in the antenna holding groove 34 in a state in which it is displaceable in the radial direction (the direction perpendicular to the length direction of the electromagnetic field coupling portion 21) (see FIG. 6). Since the electromagnetic field coupling portion 21 is displaceable, when an external force acts on the second antenna 2, the stress in the second antenna 2 can be alleviated. Therefore, the second antenna 2 can be made less likely to be damaged. In contrast, when the second antenna is fixed to the exterior body, when an external force acts on the second antenna, stress is concentrated on the base end (root portion) of the second antenna extending from the exterior body, and this portion may be more likely to be damaged.
  • the electromagnetic field coupling portion 21 of the second antenna 2 has a shape that follows the outer peripheral edge 12a of the first antenna 12, so that the electromagnetic field coupling portion 21 can be sufficiently electromagnetically coupled to the first antenna 12.
  • the antenna holding groove 34 is formed along the outer peripheral edge 12a of the first antenna 12, so that the electromagnetic field coupling portion 21 of the second antenna 2 can be positioned along the first antenna 12. Therefore, the electromagnetic field coupling portion 21 can be sufficiently electromagnetically coupled to the first antenna 12.
  • the electromagnetic field coupling portion 21 of the second antenna 2 has a curved shape (e.g., a semi-elliptical shape), even when an external force acts on the second antenna 2, stress concentration is less likely to occur compared to when the shape is rectangular. This makes it possible to make the second antenna 2 less likely to be damaged. In contrast, if the electromagnetic field coupling portion is rectangular, when an external force acts on the second antenna, stress will concentrate at the corners (bends), and damage may be more likely to occur at these points.
  • the antenna holding groove 34 is formed along the outer peripheral edge 13a of the substrate 1, so that the electromagnetic field coupling portion 21 of the second antenna 2 can be positioned along the first antenna 12. This allows the electromagnetic field coupling portion 21 to be sufficiently electromagnetically coupled to the first antenna 12.
  • the exterior body 3 comprises a main body portion 31 and a lid portion 32 that is overlaid on the main surface 31a.
  • the board holding recess 37 and the antenna holding groove 34 are formed on the main surface 31a. Therefore, the lid portion 32 can prevent the board 1 and the second antenna 2 from falling off the main body portion 31. Therefore, the board 1 and the second antenna 2 can be stably held in the exterior body 3.
  • a slit-shaped side end opening 36 extending in the Y direction (direction along the main surface 31a) is formed on the side end edge 31b of the exterior body 3. Therefore, the position of the second antenna 2 can be moved in the Y direction relative to the exterior body 3. Therefore, when an external force acts on the second antenna 2, the stress is easily alleviated by the displacement. This makes it possible to make the second antenna 2 less likely to be damaged.
  • the outer periphery 13a of the substrate 1 and the outer periphery 12a of the first antenna 12 are curved all around, but the substrate and the first antenna may have only a portion of their outer periphery curved.
  • the exterior body 3 includes a main body portion 31 and a lid portion 32, but the configuration of the exterior body is not particularly limited.
  • the exterior body does not have to include a lid portion.
  • the exterior body is not limited to being plate-shaped, and may have other shapes (such as a block shape).
  • the communication device 10 has an antenna section.
  • the antenna section has a portion (extension section 22) in which a predetermined shape is repeatedly arranged (at a predetermined pitch interval) in the extension direction while folding back and forth at an apex in a direction perpendicular to the extension direction.
  • a portion extension section 22
  • Specific examples of the shape of this portion include a serpentine shape, a wave shape, and a zigzag shape.
  • Fig. 7 is a cross-sectional view in the tire width direction of the pneumatic tire.
  • Fig. 7 shows only one half in the tire width direction bounded by the tire equatorial plane CL, but the other half has a similar configuration.
  • the pneumatic tire may have an asymmetric portion bounded by the tire equatorial plane CL.
  • This pneumatic tire 50 is a passenger vehicle tire, but it may also be a tire suitable for other uses (e.g., a heavy-duty tire).
  • the internal structure of the tire is not particularly limited, but the following configuration can be exemplified.
  • the tire 50 has a pair of bead portions 51, a pair of sidewall portions 52 connected to the bead portions 51, and a tread portion 53 connected to the pair of sidewall portions 52.
  • a bead core 51a is embedded in the bead portion 51, and a bead filler 51b is arranged on the tire radial outer side of the bead core 51a.
  • the tire 50 also has a carcass 54 consisting of one or more carcass plies that spans the pair of bead portions 50 in a toroidal shape.
  • the carcass ply is made of radially arranged carcass cords coated with rubber. In this example, the carcass cords are made of steel cords.
  • the number of carcass plies is not particularly limited.
  • the diameter of the carcass cord is not particularly limited, but can be 0.5 to 1.5 mm.
  • a belt 55 consisting of one or more belt layers 55a, 55b (two layers in the illustrated example) is arranged on the radially outer side of the crown portion of the carcass 54, and tread rubber is arranged on the radially outer side of the belt 55.
  • the belt cord of the belt 55 is an organic fiber cord.
  • the belt cord can be inclined at an inclination angle of, for example, 30 to 60 degrees with respect to the circumferential direction of the tire. There are no particular limitations on the number of belt layers or the belt width.
  • This tire 50 is equipped with an RF tag 10 as a communication device.
  • the RF tag includes an IC chip and an antenna.
  • the RF tag may be, for example, sandwiched between a plurality of members of the same or different types that constitute the tire. In this way, the RF tag can be easily attached during tire production, and the productivity of tires equipped with an RF tag can be improved.
  • the RF tag may be, for example, sandwiched between a bead filler and another member adjacent to the bead filler.
  • the RF tag may be embedded in any of the members that constitute the tire. In this way, the load applied to the RF tag can be reduced compared to when the RF tag is sandwiched between a plurality of members that constitute the tire.
  • the RF tag may be, for example, embedded in a rubber member such as a tread rubber or a side rubber. It is preferable that the RF tag is not placed at a position that is a boundary between members with different rigidity in the periphery length direction, which is a direction along the outer surface of the tire in a cross-sectional view in the tire width direction. In this way, the RF tag is not placed in a position where distortion is likely to concentrate due to a rigidity step. Therefore, the load applied to the RF tag can be reduced. This can improve the durability of the RF tag.
  • the RF tag is not placed at a position that is, for example, a boundary between the end of the carcass and a member adjacent to the end of the carcass (e.g., a side rubber, etc.) in a cross-sectional view in the tire width direction.
  • the number of RF tags is not particularly limited.
  • a tire may include only one RF tag, or may include two or more RF tags.
  • an RF tag is illustrated as an example of a communication device, but a communication device other than the RF tag may also be used.
  • the RF tag may be placed, for example, in the tread portion of the tire. In this way, the RF tag is not damaged by a side cut of the tire.
  • the RF tag may be placed, for example, in the center of the tread in the tire width direction.
  • the center of the tread is a position in the tread portion where bending is unlikely to concentrate. In this way, the load applied to the RF tag can be reduced. This improves the durability of the RF tag.
  • the RF tag may be placed, for example, within a range of 1/2 the tread width centered on the tire equatorial plane in the tire width direction.
  • the RF tag may be placed, for example, at the tread end in the tire width direction. If the position of the reader that communicates with the RF tag is predetermined, the RF tag may be placed, for example, at the tread end on one side closer to the reader. In this example, the RF tag may be placed, for example, within a range of 1/4 the tread width in the tire width direction, with the tread end as the outer end.
  • the RF tag may be arranged, for example, on the tire cavity side of the carcass, which includes one or more carcass plies that span between the bead portions. In this way, the RF tag is less likely to be damaged by impacts applied from outside the tire, or damage such as side cuts and nail penetration.
  • the RF tag may be arranged in close contact with the surface of the carcass on the tire cavity side.
  • the RF tag may be arranged, for example, between the carcass and another member located on the tire cavity side of the carcass.
  • An example of another member located on the tire cavity side of the carcass is an inner liner that forms the tire inner surface.
  • the RF tag may be attached to the tire inner surface facing the tire cavity.
  • the RF tag By configuring the RF tag to be attached to the tire inner surface, it is easy to attach the RF tag to the tire and to inspect and replace the RF tag. In other words, the ease of attachment and maintenance of the RF tag can be improved.
  • the RF tag by attaching the RF tag to the inner surface of the tire, the RF tag can be prevented from becoming the core of tire failure, compared to a configuration in which the RF tag is embedded in the tire.
  • the RF tag may be positioned between the overlapped carcass plies.
  • the RF tag may be arranged, for example, in the tread portion of the tire, on the tire radial outside of the belt including one or more belt plies.
  • the RF tag may be arranged on the tire radial outside of the belt and in close contact with the belt.
  • the RF tag may be arranged on the tire radial outside of the reinforcing belt layer and in close contact with the reinforcing belt layer.
  • the RF tag may be embedded in the tread rubber on the tire radial outside of the belt.
  • the RF tag By arranging the RF tag on the tire radial outside of the belt in the tread portion of the tire, communication with the RF tag from the outside of the tire in the tire radial direction is less likely to be hindered by the belt. Therefore, it is possible to improve communication with the RF tag from the outside of the tire in the tire radial direction.
  • the RF tag may be arranged, for example, in the tire tread portion of the tire, on the tire radial inside of the belt. In this way, the tire radial outside of the RF tag is covered by the belt, so that the RF tag is less likely to be damaged by impacts from the tread surface or nail penetration.
  • the RF tag may be placed in the tread portion of the tire, between the belt and the carcass located radially inward of the belt. Also, if the belt has multiple belt plies, the RF tag may be placed in the tread portion of the tire, between any two belt plies. In this way, the outer side of the RF tag in the tire radial direction is covered by one or more belt plies, making the RF tag less susceptible to damage from impacts from the tread surface or nail penetration.
  • the RF tag may be arranged, for example, sandwiched between the cushion rubber and the tread rubber, or between the cushion rubber and the side rubber. In this way, the impact on the RF tag can be mitigated by the cushion rubber. This improves the durability of the RF tag.
  • the RF tag may also be embedded, for example, in the cushion rubber.
  • the cushion rubber may be made up of multiple adjacent rubber members of the same or different types. In such cases, the RF tag may be arranged, sandwiched between the multiple rubber members that make up the cushion rubber.
  • the RF tag may be arranged, for example, at the sidewall or bead of the tire.
  • the RF tag may be arranged, for example, at one sidewall or one bead that is closer to a reader that can communicate with the RF tag. In this way, the communication between the RF tag and the reader can be improved.
  • the RF tag may be arranged between the carcass and the side rubber, or between the tread rubber and the side rubber.
  • the RF tag may be arranged, for example, in the tire radial direction, between the position where the tire is at its maximum width and the position of the tread surface.
  • the communication with the RF tag from the outside of the tire in the tire radial direction can be improved compared to a configuration in which the RF tag is arranged on the inner side in the tire radial direction from the position where the tire is at its maximum width.
  • the RF tag may be arranged, for example, on the inner side in the tire radial direction from the position where the tire is at its maximum width. In this way, the RF tag is arranged near the bead portion that has high rigidity. Therefore, the load applied to the RF tag can be reduced. This can improve the durability of the RF tag.
  • the RF tag may be arranged at a position adjacent to the bead core in the tire radial direction or tire width direction.
  • Distortion is less likely to concentrate near the bead core. This reduces the load on the RF tag. This improves the durability of the RF tag.
  • the RF tag is placed radially inward from the maximum tire width position and radially outward from the bead core of the bead portion. This improves the durability of the RF tag, and communication between the RF tag and the reader is less likely to be hindered by the bead core, improving the communication performance of the RF tag.
  • the RF tag may be sandwiched between the multiple rubber members that make up the side rubber.
  • the RF tag may be sandwiched between the bead filler and a member adjacent to the bead filler. In this way, the RF tag can be placed in a position where distortion is less likely to concentrate due to the placement of the bead filler. Therefore, the load on the RF tag can be reduced. This improves the durability of the RF tag.
  • the RF tag may be sandwiched between the bead filler and the carcass, for example.
  • the portion of the carcass that sandwiches the RF tag together with the bead filler may be located on the outside in the tire width direction relative to the bead filler, or may be located on the inside in the tire width direction.
  • the bead filler may also have a portion that is located adjacent to the side rubber. In such a case, the RF tag may be disposed by being sandwiched between the bead filler and the side rubber. Furthermore, the bead filler may have a portion disposed adjacent to the rubber chafer. In such a case, the RF tag may be disposed by being sandwiched between the bead filler and the rubber chafer.
  • the RF tag may be sandwiched between the stiffener and a member adjacent to the stiffener. In this way, the RF tag can be placed in a position where the stiffener makes it difficult for distortion to concentrate. Therefore, the load on the RF tag can be reduced. This improves the durability of the RF tag.
  • the RF tag may be sandwiched between the stiffener and the side rubber, for example.
  • the RF tag may also be sandwiched between the stiffener and the carcass, for example.
  • the part of the carcass that sandwiches the RF tag together with the stiffener may be located on the outside in the tire width direction relative to the stiffener, or may be located on the inside in the tire width direction.
  • the stiffener may have a part that is located adjacent to the rubber chafer. In this case, the RF tag may be sandwiched between the stiffener and the rubber chafer. The stiffener may have a portion adjacent to the hat rubber on the outer side in the tire width direction. In this case, the RF tag may be sandwiched between the stiffener and the hat rubber.
  • the stiffener may be composed of a plurality of rubber members having different hardness.
  • the RF tag may be sandwiched between a plurality of rubber members constituting the stiffener.
  • the RF tag may be sandwiched between the hat rubber and a member adjacent to the hat rubber.
  • the RF tag may be sandwiched between, for example, the hat rubber and the carcass ply. In this way, the impact on the RF tag can be mitigated by the hat rubber. Therefore, the durability of the RF tag can be improved.
  • the RF tag may be arranged, for example, sandwiched between the rubber chafer and the side rubber. In this way, the RF tag can be arranged in a position where distortion is less likely to be concentrated due to the placement of the rubber chafer. This makes it possible to reduce the load on the RF tag. This makes it possible to improve the durability of the RF tag.
  • the RF tag may be arranged, for example, sandwiched between the rubber chafer and the carcass. In this way, it makes it possible to reduce the load on the RF tag due to impacts and damage from the rim. This makes it possible to improve the durability of the RF tag.
  • the RF tag may be sandwiched between the nylon chafer and another member adjacent to the nylon chafer on the outer or inner side in the tire width direction. In this way, the position of the RF tag is less likely to fluctuate when the tire deforms. Therefore, the load applied to the RF tag when the tire deforms can be reduced. This improves the durability of the RF tag.
  • the nylon chafer may have a portion adjacent to the rubber chafer, for example, on the outer side in the tire width direction. In such a case, the RF tag may be sandwiched between the nylon chafer and the rubber chafer.
  • the nylon chafer may have a portion adjacent to the side rubber, for example, on the outer side in the tire width direction.
  • the RF tag may be sandwiched between the nylon chafer and the side rubber.
  • the nylon chafer may have a portion adjacent to the stiffener, for example, on the inner side in the tire width direction.
  • the RF tag may be sandwiched between the nylon chafer and the stiffener.
  • the nylon chafer may have a portion adjacent to the hat rubber, for example, on the inner side in the tire width direction.
  • the RF tag may be disposed by being sandwiched between the nylon chafer and the hat rubber.
  • the nylon chafer may have a portion adjacent to the carcass, for example, on the inner side in the tire width direction.
  • the RF tag may be disposed by being sandwiched between the nylon chafer and the carcass.
  • the nylon chafer may have a portion adjacent to the wire chafer, for example, on the inner side in the tire width direction.
  • the RF tag may be disposed by being sandwiched between the nylon chafer and the wire chafer. In this way, the RF tag may be disposed by being sandwiched between the nylon chafer and another member adjacent to the outer side or inner side of the nylon chafer in the tire width direction.
  • the load applied to the RF tag due to impact or damage from the outside of the tire in the tire width direction can be further reduced. This can further improve the durability of the RF tag.
  • the RF tag may be sandwiched between the wire chafer and another adjacent member on the inside or outside of the wire chafer in the tire width direction. This makes it difficult for the position of the RF tag to fluctuate when the tire deforms. This reduces the load applied to the RF tag when the tire deforms. This improves the durability of the RF tag.
  • the other member adjacent to the wire chafer on the inside or outside of the tire width direction may be, for example, a rubber member such as a rubber chafer.
  • the other member adjacent to the wire chafer on the inside or outside of the tire width direction may be, for example, a carcass.
  • a belt reinforcing layer may be further provided on the radially outer side of the belt.
  • the belt reinforcing layer may be formed by winding a cord made of polyethylene terephthalate in a continuous spiral shape in the tire circumferential direction.
  • the cord may be adhesive-treated under a tension of 6.9 ⁇ 10 ⁇ 2 N/tex or more, and may have an elastic modulus of 2.5 mN/dtex ⁇ % or more at a load of 29.4 N measured at 160° C.
  • the belt reinforcing layer may be disposed so as to cover the entire belt or to cover only both ends of the belt.
  • the winding density per unit width of the belt reinforcing layer may differ depending on the position in the width direction. In this way, road noise and flat spots can be reduced without reducing high-speed durability.
  • the method for manufacturing a pneumatic tire of this embodiment is a method for manufacturing a pneumatic tire 50 incorporating a communication device 10, and the communication device 10 has an antenna portion (second antenna 2), and the antenna portion has a portion (extension portion 22) in which a predetermined shape is repeatedly arranged in the extension direction while folding back and forth at an apex in a direction perpendicular to the extension direction.
  • the manufacturing method of the pneumatic tire of the present embodiment includes a step of covering the antenna portion with rubber in a state in which tension is applied to the outer side of the extension direction of the antenna portion (see FIG. 8).
  • tension is applied to the two extension portions 22 extending on one side and the other side, respectively, on the outer side of the extension direction, which is a direction away from the exterior body 3.
  • the manufacturing method of the pneumatic tire of this embodiment includes a step of covering the antenna portion 22 with rubber while applying tension to the outside in the extension direction of the antenna portion 22 (see FIG. 8), so that the pneumatic tire is completed with the antenna portion 22 pulled outward in the extension direction.
  • the compressive force when a compressive force is applied to the extension portion 22 of the built-in communication unit 10, the compressive force can be alleviated by the tensile force, which is the residual stress, and failure of the antenna portion due to buckling can be suppressed.
  • the durability of the antenna portion of the communication device can be improved.
  • the tension applied to the outside of the extension direction of the antenna part 22 is 50 to 200 N.
  • the tension applied to the outside of the extension direction of the antenna part 22 is 50 to 200 N.
  • Another aspect of the method for manufacturing a pneumatic tire is a method for manufacturing a pneumatic tire with a built-in communication device, and includes a step of expanding the tire with the extension direction of the antenna portion set to the tire circumferential direction.
  • the communication device has an antenna portion, and the antenna portion has a portion in which a predetermined shape is repeatedly arranged in the extension direction while folding back and forth at an apex in a direction perpendicular to the extension direction.
  • the antenna portion (extension portion 22) when the tire is expanded in the above process, the antenna portion (extension portion 22) is pulled in the tire circumferential direction by the tire expansion force, and a tensile residual stress can be imparted to the antenna portion (extension portion 22) of the communication portion of the completed tire. Therefore, when a compressive force is applied to the extension portion 22 of the built-in communication portion 10 in a pneumatic tire, the compressive force can be alleviated by the tensile force, which is the residual stress, and failure of the antenna portion due to buckling can be suppressed. As described above, the manufacturing method of a pneumatic tire according to this aspect can also improve the durability of the antenna portion of a communication device.
  • the tire expansion process is preferably performed with the communication device positioned radially outward from the tire's maximum width position. This is because the rate of expansion is higher on the radially outward side of the tire, and therefore compressive residual stress can be effectively imparted to the extension portion 22 of the built-in communication unit 10.
  • the tires obtained by each of the above manufacturing methods have an antenna portion with residual stress directed outward in the extension direction of the antenna portion.
  • SDGs Sustainable Development Goals
  • 1 substrate; 2: second antenna; 3: exterior body; 10: RF tag (communication device), 11: RFID chip, 12: first antenna; 12a: outer periphery; 21: electromagnetic field coupling portion; 21a: end portion; 22: extension portion; 34: Antenna holding groove, 37: Substrate holding recess (substrate holding portion), 50: pneumatic tire, 51: bead portion, 52: sidewall portion, 53: tread portion, 54: carcass, 55: belt, CL: Tire equatorial plane

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
  • Tyre Moulding (AREA)

Abstract

In a pneumatic tire manufacturing method of the present invention, a communication device has an antenna unit, and the antenna unit has a portion in which a predetermined shape is repeatedly arranged in an extending direction while reciprocating by being folded back at the apex in a direction perpendicular to the extending direction, the method comprising a step for covering the antenna unit with rubber with tension applied to the outside in the extending direction of the antenna unit, or a step for expanding the tire with the extending direction of the antenna unit as the circumferential direction of the tire.

Description

空気入りタイヤの製造方法Manufacturing method of pneumatic tire
　本発明は、空気入りタイヤの製造方法に関するものである。 The present invention relates to a method for manufacturing pneumatic tires.
　従来、タイヤの製造管理、出荷管理、使用履歴管理等のデータを読み書きするためのメモリ等を有するＲＦ（Ｒａｄｉｏ　Ｆｒｅｑｕｅｎｃｙ）タグ等の通信装置を備えた空気入りタイヤが知られている（例えば特許文献１）。このような通信装置として、アンテナ部が、延在方向に直交する方向に頂点で折り返されて往復しながら延在方向に所定の形状が繰り返し配列されてなる部分を有するものが提案されている（例えば特許文献２）。 　Pneumatic tires equipped with a communication device such as an RF (Radio Frequency) tag that has a memory for reading and writing data for manufacturing management, shipping management, usage history management, etc., of the tire are known (for example, Patent Document 1). As such a communication device, a device has been proposed in which the antenna section has a portion in which a predetermined shape is repeatedly arranged in the extension direction while folding back and forth at the apex in a direction perpendicular to the extension direction (for example, Patent Document 2).
特開２０１６－０３７２３５号公報JP 2016-037235 A 特開２０２２－０８４１４５号公報JP 2022-084145 A
　本発明者らが、延在方向に直交する方向に頂点で折り返されて往復しながら延在方向に所定の形状が繰り返し配列されてなる部分を有するアンテナ部を備えた通信装置を空気入りタイヤに設けることを検討したところ、アンテナ部の耐久性が十分でない場合が生じることが判明した。 The inventors considered fitting a communication device to a pneumatic tire, which has an antenna section that has a portion in which a predetermined shape is repeatedly arranged in the extension direction while folding back and forth at an apex in a direction perpendicular to the extension direction, and found that there are cases in which the durability of the antenna section is insufficient.
　そこで、本発明は、通信装置のアンテナ部の耐久性を向上させ得る、空気入りタイヤの製造方法を提供することを目的とする。 The present invention aims to provide a method for manufacturing pneumatic tires that can improve the durability of the antenna portion of a communication device.
　本発明の要旨構成は、以下の通りである。
通信装置を内蔵した空気入りタイヤを製造する方法であって、
　前記通信装置は、アンテナ部を有し、
　前記アンテナ部は、延在方向に直交する方向に頂点で折り返されて往復しながら延在方向に所定の形状が繰り返し配列されてなる部分を有し、
　前記アンテナ部の延在方向外側に張力を与えた状態で、前記アンテナ部をゴムで被覆する工程を含むことを特徴とする、空気入りタイヤの製造方法。 The gist and configuration of the present invention are as follows.
A method for manufacturing a pneumatic tire having a built-in communication device, comprising the steps of:
The communication device has an antenna unit,
The antenna portion has a portion in which a predetermined shape is repeatedly arranged in the extension direction while being folded back and forth at a vertex in a direction perpendicular to the extension direction,
A method for manufacturing a pneumatic tire, comprising: covering the antenna portion with rubber while applying tension to the outside of the antenna portion in an extension direction.
　通信装置を内蔵した空気入りタイヤを製造する方法であって、
　前記通信装置は、アンテナ部を有し、
　前記アンテナ部は、延在方向に直交する方向に頂点で折り返されて往復しながら延在方向に所定の形状が繰り返し配列されてなる部分を有し、
　前記アンテナ部の延在方向をタイヤ周方向とした状態でタイヤを拡張する工程を含むことを特徴とする、空気入りタイヤの製造方法。 A method for manufacturing a pneumatic tire having a built-in communication device, comprising the steps of:
The communication device has an antenna unit,
The antenna portion has a portion in which a predetermined shape is repeatedly arranged in the extension direction while being folded back and forth at a vertex in a direction perpendicular to the extension direction,
A method for manufacturing a pneumatic tire, comprising: expanding the tire with the extension direction of the antenna portion aligned in the tire circumferential direction.
　本発明によれば、通信装置のアンテナ部の耐久性を向上させ得る、空気入りタイヤの製造方法を提供することができる。 The present invention provides a method for manufacturing a pneumatic tire that can improve the durability of the antenna portion of a communication device.
ＲＦタグの平面図である。FIG. 2 is a plan view of the RF tag. ＲＦタグの斜視図である。FIG. 外装体の蓋部を外した状態のＲＦタグの斜視図である。2 is a perspective view of the RF tag with the lid of the exterior body removed. FIG. ＲＦタグの分解斜視図である。FIG. 第２アンテナの平面図である。FIG. 4 is a plan view of a second antenna. ＲＦタグの一部断面図である。FIG. 2 is a partial cross-sectional view of the RF tag. 空気入りタイヤのタイヤ幅方向断面図（半部）である。1 is a cross-sectional view (half) of a pneumatic tire in the tire width direction. アンテナ部に張力を付与する様子を模式的に示した図である。11 is a diagram showing a schematic diagram of a state in which tension is applied to an antenna part. FIG.
　以下、本発明の実施形態について、図面を参照して詳細に例示説明する。 Below, an embodiment of the present invention will be described in detail with reference to the drawings.
＜通信装置＞
　先に、本実施形態の空気入りタイヤの製造方法は、通信装置を内蔵した空気入りタイヤを製造する方法であるので、先に通信装置について説明する。 <Communication Device>
Since the method for manufacturing a pneumatic tire according to the present embodiment is a method for manufacturing a pneumatic tire having a built-in communication device, the communication device will be described first.
［通信装置］
　図１は、通信装置１０の平面図である。通信装置は、「ＲＦタグ」ということがある。図２は、ＲＦタグ１０の斜視図である。図３は、外装体の蓋部を外した状態のＲＦタグ１０の斜視図である。図４は、ＲＦタグ１０の分解斜視図である。図５は、第２アンテナ２の平面図である。図６は、ＲＦタグ１０の一部断面図である。図６は、図２のＩ－Ｉ断面図である。 [Communication device]
Fig. 1 is a plan view of a communication device 10. A communication device is sometimes called an "RF tag." Fig. 2 is a perspective view of the RF tag 10. Fig. 3 is a perspective view of the RF tag 10 with the cover of the exterior body removed. Fig. 4 is an exploded perspective view of the RF tag 10. Fig. 5 is a plan view of the second antenna 2. Fig. 6 is a partial cross-sectional view of the RF tag 10. Fig. 6 is a cross-sectional view taken along line II of Fig. 2.
　図１および図２に示すように、ＲＦタグ１０は、基板１と、第２アンテナ２と、外装体３とを備える。外装体３の主面３１ａ（図３参照）の長手方向（図１における左右方向）をＸ方向という。Ｘ方向のうち一方向（図１における右方向）を＋Ｘ方向という。Ｘ方向のうち他方向（図１における左方向）を－Ｘ方向という。外装体３の主面３１ａ（図３参照）の短手方向をＹ方向という。Ｙ方向は、主面３１ａに沿う面内においてＸ方向に直交する。Ｙ方向のうち一方向（図１における上方向）を＋Ｙ方向という。Ｙ方向のうち他方向（図１ における下方向）を－Ｙ方向という。外装体３の主面３１ａに直交する方向をＺ方向という。Ｚ方向は、Ｘ方向およびＹ方向に直交する。Ｚ方向から見ることを平面視という。Ｚ軸とは、Ｚ方向に沿う中心軸である。 As shown in Figs. 1 and 2, the RF tag 10 includes a substrate 1, a second antenna 2, and an exterior body 3. The longitudinal direction (left-right direction in Fig. 1) of the main surface 31a (see Fig. 3) of the exterior body 3 is called the X direction. One direction of the X direction (right direction in Fig. 1) is called the +X direction. The other direction of the X direction (left direction in Fig. 1) is called the -X direction. The short-side direction of the main surface 31a (see Fig. 3) of the exterior body 3 is called the Y direction. The Y direction is perpendicular to the X direction in a plane along the main surface 31a. One direction of the Y direction (upward in Fig. 1) is called the +Y direction. The other direction of the Y direction (downward in Fig. 1) is called the -Y direction. The direction perpendicular to the main surface 31a of the exterior body 3 is called the Z direction. The Z direction is perpendicular to the X direction and the Y direction. Viewing from the Z direction is called planar view. The Z axis is the central axis along the Z direction.
　図３に示すように、基板１は、ＲＦＩＤチップ１１と、第１アンテナ１２と、基材１３とを備える。基板１には、ＲＦＩＤチップ１１と第１アンテナ１２とが設けられている。 As shown in FIG. 3, the substrate 1 includes an RFID chip 11, a first antenna 12, and a base material 13. The substrate 1 is provided with the RFID chip 11 and the first antenna 12.
　基材１３は、板状に形成されている。平面視における基材１３の形状は、特に限定されないが、少なくとも外周縁１３ａの一部が湾曲形状であることが好ましい。湾曲形状は、例えば、楕円弧状、円弧状、高次曲線状（例えば二次曲線状）などである。高次曲線状は、放物線状、双曲線状などである。平面視における基材１３の外形は、例えば、楕円形状、円形状、長円形状（レーストラック形状）などであってよい。平面視における基材１３の外形は、非円形状が望ましい。本実施形態では、基材１３は、楕円形状とされている。基材１３は、長径方向をＸ方向に向けた姿勢とされている。基材１３としては、ガラスエポキシ樹脂基板、セラミックス、プラスチックフィルムなどが使用できる。 The substrate 13 is formed in a plate shape. The shape of the substrate 13 in plan view is not particularly limited, but it is preferable that at least a part of the outer periphery 13a is curved. The curved shape is, for example, an elliptical arc shape, a circular arc shape, or a high-order curve shape (e.g., a quadratic curve shape). The high-order curve shape is, for example, a parabola shape, a hyperbola shape, etc. The outer shape of the substrate 13 in plan view may be, for example, an elliptical shape, a circular shape, an oval shape (a racetrack shape), etc. It is preferable that the outer shape of the substrate 13 in plan view is non-circular. In this embodiment, the substrate 13 is elliptical. The substrate 13 is oriented so that the major axis direction faces the X direction. The substrate 13 may be a glass epoxy resin substrate, a ceramic, a plastic film, or the like.
　ＲＦＩＤチップ１１は、第１アンテナ１２および第２アンテナ２を介して非接触にて情報の書き込みおよび読み出しが可能である。ＲＦＩＤチップ１１は、基材１３に実装されている。 The RFID chip 11 allows for contactless writing and reading of information via the first antenna 12 and the second antenna 2. The RFID chip 11 is mounted on a substrate 13.
　第１アンテナ１２は、例えば、基材１３の一方の面に形成された導電層である。導電層は、例えば、導電性箔、メッキ層、導電インク層などで構成される。導電性箔は、例えば、銅、銀、金、白金、アルミニウムなどで構成される金属箔である。導電性箔は、エッチングなどによって所定の形状に形成される。メッキ層は、例えば、銅、銀、金、白金、アルミニウムなどの金属で構成される。導電インク層は、導電インクを用いて印刷などにより形成される。導電インクは、金属、カーボン材料などで形成される導電性粒子を含む。 The first antenna 12 is, for example, a conductive layer formed on one surface of the substrate 13. The conductive layer is, for example, composed of a conductive foil, a plating layer, a conductive ink layer, etc. The conductive foil is, for example, a metal foil composed of copper, silver, gold, platinum, aluminum, etc. The conductive foil is formed into a predetermined shape by etching or the like. The plating layer is, for example, composed of a metal such as copper, silver, gold, platinum, aluminum, etc. The conductive ink layer is formed by printing or the like using a conductive ink. The conductive ink contains conductive particles formed of a metal, carbon material, etc.
　第１アンテナ１２は、ループ状に形成されている。第１アンテナ１２は、例えば、基材１ ３の外周縁１３ａに沿う湾曲形状を有する。第１アンテナ１２は、楕円形状のループ状に形成されている。第１アンテナ１２は、ＲＦＩＤ チップ１１に電気的に接続されている。 The first antenna 12 is formed in a loop shape. The first antenna 12 has, for example, a curved shape that follows the outer peripheral edge 13a of the substrate 13. The first antenna 12 is formed in an elliptical loop shape. The first antenna 12 is electrically connected to the RFID chip 11.
　第２アンテナ２は、ブースター用のアンテナである。第２アンテナ２は、例えば、線状体である。第２アンテナ２は、例えば、スチール、ステンレス鋼、銅、銅合金などの金属で形成されている。第２アンテナ２は、例えば、真鍮メッキ鋼線で形成することができる。第２アンテナ２は、基板１とは別体とされている。なお、第２アンテナ２は線状体であるが、第２アンテナは、例えば、板状体であってもよい。 The second antenna 2 is an antenna for the booster. The second antenna 2 is, for example, a linear body. The second antenna 2 is formed of a metal such as steel, stainless steel, copper, or a copper alloy. The second antenna 2 can be formed of, for example, a brass-plated steel wire. The second antenna 2 is separate from the substrate 1. Although the second antenna 2 is a linear body, the second antenna may be, for example, a plate-shaped body.
　第２アンテナ２は、電磁界結合部２１と、一対の延出部２２とを備える。電磁界結合部２１は、湾曲形状を有する。「湾曲形状」とは、急峻な屈曲部がなく、滑らかに曲がる形状である。湾曲形状としては、例えば、楕円弧状、円弧状、高次曲線状（例えば二次曲線状）などがある。「高次曲線状」としては、放物線状、双曲線状などがある。電磁界結合部２１は、半楕円形状とされている。詳しくは、電磁界結合部２１は、楕円形の一方の頂点（長軸と交わる頂点）から他方の頂点（長軸と交わる頂点）に至る半楕円形状である。 The second antenna 2 comprises an electromagnetic field coupling portion 21 and a pair of extension portions 22. The electromagnetic field coupling portion 21 has a curved shape. A "curved shape" is a shape that curves smoothly without any sharp bends. Examples of curved shapes include an elliptical arc shape, a circular arc shape, and a higher-order curve shape (e.g., a quadratic curve shape). Examples of a "higher-order curve shape" include a parabola shape and a hyperbola shape. The electromagnetic field coupling portion 21 is in a semi-elliptical shape. More specifically, the electromagnetic field coupling portion 21 is in a semi-elliptical shape that extends from one vertex of the ellipse (the vertex that intersects with the major axis) to the other vertex (the vertex that intersects with the major axis).
　電磁界結合部２１は、平面視において、基板１の少なくとも一部を囲む形状とされる。電磁界結合部２１は、楕円形状の基板１の一方の頂点（長軸と交わる頂点）から他方の頂点（長軸と交わる頂点）に至る範囲（＋Ｙ方向側の半周範囲）を囲む。 The electromagnetic field coupling portion 21 is shaped to surround at least a portion of the substrate 1 in a plan view. The electromagnetic field coupling portion 21 surrounds the area (half the circumference in the +Y direction) from one vertex (the vertex intersecting with the long axis) of the elliptical substrate 1 to the other vertex (the vertex intersecting with the long axis).
　電磁界結合部２１は、平面視において、第１アンテナ１２の外周縁１２ａに沿う湾曲形状（例えば、楕円弧状）とされている。電磁界結合部２１と外周縁１２ａとの離間距離は、ほぼ一定である。電磁界結合部２１は、平面視において、基板１の外周縁１３ａの外側に、外周縁１３ａに近接して位置する。電磁界結合部２１は、平面視において、外周縁１３ａに沿う形状とされる。電磁界結合部２１と外周縁１３ａとの離間距離は、ほぼ一定である。 The electromagnetic field coupling portion 21 has a curved shape (e.g., an elliptical arc shape) that follows the outer peripheral edge 12a of the first antenna 12 in a plan view. The distance between the electromagnetic field coupling portion 21 and the outer peripheral edge 12a is approximately constant. The electromagnetic field coupling portion 21 is located outside the outer peripheral edge 13a of the substrate 1 and close to the outer peripheral edge 13a in a plan view. The electromagnetic field coupling portion 21 has a shape that follows the outer peripheral edge 13a in a plan view. The distance between the electromagnetic field coupling portion 21 and the outer peripheral edge 13a is approximately constant.
　電磁界結合部２１は、非接触で第１アンテナ１２と電磁界結合する。電磁界結合とは、例えば、電界結合と磁界結合のうち一方である。電磁界結合部２１の長さ方向に直交する断面の形状は、例えば、円形状である（図６参照）。 The electromagnetic field coupling portion 21 is electromagnetically coupled to the first antenna 12 in a non-contact manner. The electromagnetic field coupling is, for example, either electric field coupling or magnetic field coupling. The shape of a cross section perpendicular to the longitudinal direction of the electromagnetic field coupling portion 21 is, for example, circular (see FIG. 6).
　一対の延出部２２は、電磁界結合部２１の一方および他方の端部２１ａからそれぞれ延出する。図５に示すように、一対の延出部２２のうち一方である第１延出部２２Ａは、電磁界結合部２１の－Ｘ方向の端部２１ａから、蛇行しつつ－Ｘ方向に延出する。一対の延出部２２のうち他方である第２延出部２２Ｂは、電磁界結合部２１の＋Ｘ方向の端部２１ａから、蛇行しつつ＋Ｘ方向に延出する。 The pair of extension portions 22 extend from one and the other end 21a of the electromagnetic field coupling portion 21, respectively. As shown in FIG. 5, the first extension portion 22A, which is one of the pair of extension portions 22, extends in the -X direction from the -X direction end 21a of the electromagnetic field coupling portion 21 while meandering. The second extension portion 22B, which is the other of the pair of extension portions 22, extends in the +X direction from the +X direction end 21a of the electromagnetic field coupling portion 21 while meandering.
　延出部２２の平面視形状は、例えば、メアンダ（蛇行）形状、波状、ジグザグ形状などである。延出部２２は、メアンダ形状を有する。 The planar shape of the extension portion 22 is, for example, a meandering shape, a wavy shape, a zigzag shape, etc. The extension portion 22 has a meandering shape.
　図４に示すように、延出部２２は、複数の直線部２３と、複数の折り返し部２４とを備える。直線部２３は、Ｙ方向に沿う直線状とされている。複数の直線部２３は、Ｘ方向に間隔をおいて配置されている。折り返し部２４は、隣り合う直線部２３の端部どうしを連結する。折り返し部２４は、湾曲形状（例えば、円弧形状）を有する。 As shown in FIG. 4, the extension portion 22 has a plurality of straight portions 23 and a plurality of folded portions 24. The straight portions 23 are linearly shaped along the Y direction. The straight portions 23 are arranged at intervals in the X direction. The folded portions 24 connect the ends of adjacent straight portions 23. The folded portions 24 have a curved shape (e.g., an arc shape).
　複数の直線部２３のうち最も電磁界結合部２１に近い直線部２３を「第１直線部２３Ａ」という。複数の直線部２３のうち２番目に電磁界結合部２１に近い直線部２３を「第２直線部２３Ｂ」という。複数の直線部２３のうち３番目に電磁界結合部２１に近い直線部２３ を「第３直線部２３Ｃ」という。第１直線部２３Ａと第２直線部２３Ｂとを連結する折り返し部２４を「第１折り返し部２４Ａ」という。第２直線部２３Ｂと第３直線部２３Ｃとを連結する折り返し部２４を「第２折り返し部２４Ｂ」という。 Of the multiple straight line portions 23, the straight line portion 23 closest to the electromagnetic field coupling portion 21 is referred to as the "first straight line portion 23A." Of the multiple straight line portions 23, the straight line portion 23 second closest to the electromagnetic field coupling portion 21 is referred to as the "second straight line portion 23B." Of the multiple straight line portions 23, the straight line portion 23 third closest to the electromagnetic field coupling portion 21 is referred to as the "third straight line portion 23C." The fold portion 24 connecting the first straight line portion 23A and the second straight line portion 23B is referred to as the "first fold portion 24A." The fold portion 24 connecting the second straight line portion 23B and the third straight line portion 23C is referred to as the "second fold portion 24B."
　第１直線部２３Ａは、電磁界結合部２１の端部２１ａから－Ｙ方向に延出する。第１折り返し部２４Ａは、第１直線部２３Ａの－Ｙ方向の端部から湾曲して延び、第２直線部２３ Ｂの－Ｙ方向の端部に達する。延出部２２のうち、第１直線部２３Ａと第１折り返し部２ ４Ａの一部とは外装体３内にあるが、延出部２２のそれ以外の部分は、外装体３の外に延出している（図３参照） 。 The first straight portion 23A extends in the -Y direction from the end 21a of the electromagnetic field coupling portion 21. The first folded portion 24A extends in a curved manner from the -Y direction end of the first straight portion 23A and reaches the -Y direction end of the second straight portion 23B. Of the extension portion 22, the first straight portion 23A and a portion of the first folded portion 24A are inside the exterior body 3, but the remaining portion of the extension portion 22 extends outside the exterior body 3 (see Figure 3).
　図２に示すように、外装体３は、板状の本体部３１と、板状の蓋部３２とを備える。外装体３は、全体として板状とされている。本体部３１および蓋部３２は、例えば、樹脂で形成される。樹脂としては、ナイロン６，６などのポリアミド樹脂；ポリエチレンテレフタレート（ＰＥＴ）などのポリエステル樹脂；ポリエチレンなどのポリオレフィン樹脂；ポリフッ化ビニルなどのポリフッ化エチレン系樹脂；ポリ塩化ビニルなどのビニル重合体；ポリメタクリル酸メチルなどのアクリル系樹脂等が挙げられる。 As shown in FIG. 2, the exterior body 3 includes a plate-shaped main body 31 and a plate-shaped lid 32. The exterior body 3 is generally plate-shaped. The main body 31 and the lid 32 are formed of, for example, resin. Examples of resins include polyamide resins such as nylon 6,6; polyester resins such as polyethylene terephthalate (PET); polyolefin resins such as polyethylene; polyethylene fluoride-based resins such as polyvinyl fluoride; vinyl polymers such as polyvinyl chloride; and acrylic resins such as polymethyl methacrylate.
　図４に示すように、本体部３１は、平面視において矩形状とされている。本体部３１の一方の面である主面３１ａには、基板保持凹部３７（基板保持部）と、アンテナ保持溝３４と、一対の側部凹所３５が形成されている。基板保持凹部３７は、基板保持凸部３３によって形成される。基板保持凹部３７は、基板保持凸部３３によって囲まれた凹部である。 As shown in FIG. 4, the main body 31 has a rectangular shape in a plan view. A board holding recess 37 (board holding portion), an antenna holding groove 34, and a pair of side recesses 35 are formed on the main surface 31a, which is one surface of the main body 31. The board holding recess 37 is formed by the board holding protrusions 33. The board holding recess 37 is a recess surrounded by the board holding protrusions 33.
　基板保持凸部３３ は、環状のリブ状突起である。基板保持凸部３３は、基板１の外周縁１３ａに沿う湾曲形状（例えば、楕円形状）とされている。基板保持凸部３３ は、主面３１ａから＋Ｚ方向に突出する。基板保持凸部３３の長さ方向に直交する断面の形状は、例えば矩形状である。基板保持凸部３３は、平面視において、第１アンテナ１２の外周縁１２ａに沿う湾曲形状（例えば、楕円形状）とされている。 The board holding protrusion 33 is an annular rib-shaped protrusion. The board holding protrusion 33 has a curved shape (e.g., an elliptical shape) that fits along the outer peripheral edge 13a of the board 1. The board holding protrusion 33 protrudes from the main surface 31a in the +Z direction. The shape of a cross section perpendicular to the length direction of the board holding protrusion 33 is, for example, rectangular. In a plan view, the board holding protrusion 33 has a curved shape (e.g., an elliptical shape) that fits along the outer peripheral edge 12a of the first antenna 12.
　基板保持凹部３７は、基板１を保持する。基板保持凹部３７は、基板１の外周縁１３ａに沿う形状（例えば、楕円形状）とされている。基板保持凹部３７の内形寸法（内径）は、基板１の外形寸法（外径）とほぼ同じ、または基板１の外形寸法（外径）よりわずかに大きい。基板保持凹部３７は、平面視において基板１と相似形である。 The substrate holding recess 37 holds the substrate 1. The substrate holding recess 37 has a shape (e.g., an elliptical shape) that follows the outer peripheral edge 13a of the substrate 1. The inner dimension (inner diameter) of the substrate holding recess 37 is approximately the same as the outer dimension (outer diameter) of the substrate 1 or is slightly larger than the outer dimension (outer diameter) of the substrate 1. The substrate holding recess 37 has a similar shape to the substrate 1 in a plan view.
　基板１および基板保持凹部３７ は、非円形状（例えば、楕円形状）であると、基板１がＺ軸周りに傾斜するのを規制し、基板１の正しい姿勢を保つことができる。そのため、第１アンテナ１２と電磁界結合部２１との電磁界結合を維持することができる。 If the substrate 1 and the substrate holding recess 37 are non-circular (e.g., elliptical), they can prevent the substrate 1 from tilting around the Z axis and maintain the correct posture of the substrate 1. This makes it possible to maintain the electromagnetic coupling between the first antenna 12 and the electromagnetic field coupling portion 21.
　アンテナ保持溝３４は、第２アンテナ２の電磁界結合部２１を収容する（図３および図６ 参照）。アンテナ保持溝３４は、基板保持凸部３３の外側に、基板保持凸部３３に近接して形成されている。アンテナ保持溝３４は、平面視において、基板保持凸部３３に沿う形状とされる。アンテナ保持溝３４は、平面視において、第１アンテナ１２の外周縁１２ａに沿う湾曲形状（例えば、楕円弧状）とされている。アンテナ保持溝３４は、平面視において、基板１の外周縁１３ａに沿う湾曲形状（例えば、楕円弧状）とされている。アンテナ保持溝３４は、平面視において、半楕円形状とされている。詳しくは、アンテナ保持溝３４は、楕円形の一方の頂点（長軸と交わる頂点）から他方の頂点（長軸と交わる頂点）に至る半楕円形状である。 The antenna holding groove 34 accommodates the electromagnetic field coupling portion 21 of the second antenna 2 (see Figures 3 and 6). The antenna holding groove 34 is formed outside the substrate holding protrusion 33 and close to the substrate holding protrusion 33. The antenna holding groove 34 is shaped to follow the substrate holding protrusion 33 in a plan view. The antenna holding groove 34 is curved (e.g., elliptical) along the outer periphery 12a of the first antenna 12 in a plan view. The antenna holding groove 34 is curved (e.g., elliptical) along the outer periphery 13a of the substrate 1 in a plan view. The antenna holding groove 34 is semi-elliptical in a plan view. More specifically, the antenna holding groove 34 is semi-elliptical from one vertex of the ellipse (the vertex intersecting with the long axis) to the other vertex (the vertex intersecting with the long axis).
　アンテナ保持溝３４は、平面視において、基板１の少なくとも一部を囲む形状とされる。アンテナ保持溝３４は、楕円形状の基板１の一方の頂点（長軸と交わる頂点）から他方の頂点（長軸と交わる頂点）に至る範囲（＋Ｙ方向側の半周範囲）を囲む。 The antenna holding groove 34 is shaped to surround at least a portion of the substrate 1 in a plan view. The antenna holding groove 34 surrounds the area (half the circumference in the +Y direction) from one vertex (the vertex intersecting with the long axis) of the elliptical substrate 1 to the other vertex (the vertex intersecting with the long axis).
　図６に示すように、アンテナ保持溝３４の長さ方向に直交する断面は、例えば、矩形状である。アンテナ保持溝３４の幅（内形寸法）Ｗ１は、電磁界結合部２１の外径（外形寸法） Ｄ１より大である。幅Ｗ１と外径Ｄ１との差は、例えば、０．０１ｍｍ～１ｍｍ（好ましくは０．０５ｍｍ～０．２ｍｍ）とすることができる。アンテナ保持溝３４の幅Ｗ１が電磁界結合部２１の外径Ｄ１より大であるため、電磁界結合部２１は、線径方向（例えば、Ｙ方向）に変位可能な状態でアンテナ保持溝３４に収容される。「線径方向」は、電磁界結合部２１の長さ方向に直交する方向である。電磁界結合部２１は、アンテナ保持溝３４に対して長さ方向にも変位可能である。 As shown in FIG. 6, the cross section perpendicular to the longitudinal direction of the antenna holding groove 34 is, for example, rectangular. The width (inner dimension) W1 of the antenna holding groove 34 is larger than the outer diameter (outer dimension) D1 of the electromagnetic field coupling portion 21. The difference between the width W1 and the outer diameter D1 can be, for example, 0.01 mm to 1 mm (preferably 0.05 mm to 0.2 mm). Since the width W1 of the antenna holding groove 34 is larger than the outer diameter D1 of the electromagnetic field coupling portion 21, the electromagnetic field coupling portion 21 is accommodated in the antenna holding groove 34 in a state in which it can be displaced in the radial direction (for example, the Y direction). The "radial direction" is the direction perpendicular to the longitudinal direction of the electromagnetic field coupling portion 21. The electromagnetic field coupling portion 21 can also be displaced in the longitudinal direction relative to the antenna holding groove 34.
　アンテナ保持溝３４の深さは、アンテナ保持溝３４の底面３４ａから蓋部３２（天面３８ａ）までの高さ（内形寸法）Ｈ１が、電磁界結合部２１の外径Ｄ１より大となるように定められる。高さＨ１と外径Ｄ１との差は、例えば、０．０１ｍｍ～１ｍｍ（好ましくは０．０５ｍｍ～０．２ｍｍ）とすることができる。アンテナ保持溝３４の高さＨ１が電磁界結合部２１の外径Ｄ１より大であるため、電磁界結合部２１は、線径方向（例えば、Ｚ方向）に変位可能な状態でアンテナ保持溝３４に収容される。 The depth of the antenna holding groove 34 is determined so that the height (inner dimension) H1 from the bottom surface 34a of the antenna holding groove 34 to the lid portion 32 (top surface 38a) is greater than the outer diameter D1 of the electromagnetic field coupling portion 21. The difference between the height H1 and the outer diameter D1 can be, for example, 0.01 mm to 1 mm (preferably 0.05 mm to 0.2 mm). Because the height H1 of the antenna holding groove 34 is greater than the outer diameter D1 of the electromagnetic field coupling portion 21, the electromagnetic field coupling portion 21 is accommodated in the antenna holding groove 34 in a state in which it can be displaced in the wire diameter direction (for example, the Z direction).
　図４に示すように、側部凹所３５は、主面３１ａの一方および他方の側部に形成されている。側部凹所３５は、本体部３１のＸ方向の側端縁３１ｂを含む領域に形成されている。側部凹所３５の内周縁３５ａは、Ｙ方向に沿う第１直線部３５ｂと、湾曲部３５ｃと、Ｘ方向に沿う第２直線部３５ｄとを有する。 As shown in FIG. 4, the side recesses 35 are formed on one and the other side of the main surface 31a. The side recesses 35 are formed in an area including the side edge 31b in the X direction of the main body 31. The inner peripheral edge 35a of the side recess 35 has a first straight portion 35b along the Y direction, a curved portion 35c, and a second straight portion 35d along the X direction.
　第１直線部３５ｂは、アンテナ保持溝３４の内周縁の端部を始点として－Ｙ方向に延びる部分である。湾曲部３５ｃは、第１直線部３５ｂの先端から、Ｘ方向に対する傾斜角度が小さくなりつつ延出する部分である。第２直線部３５ｄは、湾曲部３５ｃの先端からＸ方向に沿って側端縁３１ｂに向かう部分である。 The first straight portion 35b is a portion that extends in the -Y direction starting from the end of the inner peripheral edge of the antenna holding groove 34. The curved portion 35c is a portion that extends from the tip of the first straight portion 35b while the inclination angle with respect to the X direction becomes smaller. The second straight portion 35d is a portion that extends from the tip of the curved portion 35c along the X direction toward the side edge 31b.
　図３に示すように、側部凹所３５は、平面視において、第２アンテナ２の第１直線部２３ Ａと、第１折り返し部２４Ａの一部と、を包含する。第１直線部２３Ａは、第１直線部３５ｂ（図４参照）に近接している。第１折り返し部２４Ａは、湾曲部３５ｃ（図４参照）に近接している。側部凹所３５は、第２アンテナ２の所定の長さ範囲（第１直線部２３Ａと、第１折り返し部２４Ａの一部）の少なくとも一部を収容する。 As shown in FIG. 3, the side recess 35 includes the first straight portion 23A and a portion of the first folded portion 24A of the second antenna 2 in a plan view. The first straight portion 23A is adjacent to the first straight portion 35b (see FIG. 4). The first folded portion 24A is adjacent to the curved portion 35c (see FIG. 4). The side recess 35 accommodates at least a portion of a predetermined length range of the second antenna 2 (the first straight portion 23A and a portion of the first folded portion 24A).
　図２に示すように、側部凹所３５はＹ方向に十分な距離があるため、側端縁３１ｂには、Ｙ方向（主面３１ａに沿う方向）に延びるスリット状の側端開口３６が形成される。第２アンテナ２は、側端開口３６を通して外装体３の外に延出している。図４に示すように、本体部３１の＋Ｙ方向の端縁３１ｃには、Ｘ方向に位置を違えて２つの係止凹部３９が形成されている。本体部３１の－Ｙ方向の端縁３１ｄにも、Ｘ方向に位置を違えて２つの係止凹部３９が形成されている。 As shown in Figure 2, the side recess 35 is spaced a sufficient distance in the Y direction, so that the side edge 31b has a slit-shaped side end opening 36 extending in the Y direction (direction along the main surface 31a). The second antenna 2 extends out of the exterior body 3 through the side end opening 36. As shown in Figure 4, two locking recesses 39 are formed at different positions in the X direction on the +Y direction edge 31c of the main body 31. Two locking recesses 39 are also formed at different positions in the X direction on the -Y direction edge 31d of the main body 31.
　図２に示すように、蓋部３２は、平面視において矩形状とされている。蓋部３２は、本体部３１と同形とされ、本体部３１の主面３１ａに対向して設置されている。蓋部３２は、平面視において、本体部３１の主面３１ａに重なるように設置されている。 As shown in FIG. 2, the lid portion 32 has a rectangular shape in a plan view. The lid portion 32 has the same shape as the main body portion 31 and is placed opposite the main surface 31a of the main body portion 31. The lid portion 32 is placed so as to overlap the main surface 31a of the main body portion 31 in a plan view.
　図６に示すように、蓋部３２の対向面３２ａは、本体部３１の主面３１ａに対向する面である。対向面３２ａには、位置決め溝３８が形成されている。位置決め溝３８は、環状の溝である。位置決め溝３８の長さ方向に直交する断面の形状は、例えば矩形状である。 As shown in FIG. 6, the opposing surface 32a of the lid portion 32 is a surface that faces the main surface 31a of the main body portion 31. A positioning groove 38 is formed in the opposing surface 32a. The positioning groove 38 is an annular groove. The shape of a cross section perpendicular to the longitudinal direction of the positioning groove 38 is, for example, rectangular.
　位置決め溝３８は、基板保持凸部３３およびアンテナ保持溝３４に応じた湾曲形状（例えば、楕円形状）とされている。位置決め溝３８は、平面視において、基板保持凸部３３およびアンテナ保持溝３４を一括して包含する幅を有する。位置決め溝３８の天面３８ａの一部は、アンテナ保持溝３４の底面３４ａに対向する。 The positioning groove 38 has a curved shape (e.g., an elliptical shape) that corresponds to the board holding protrusion 33 and the antenna holding groove 34. In a plan view, the positioning groove 38 has a width that collectively encompasses the board holding protrusion 33 and the antenna holding groove 34. A portion of the top surface 38a of the positioning groove 38 faces the bottom surface 34a of the antenna holding groove 34.
　図２に示すように、蓋部３２の＋Ｙ方向の端縁３２ｃには、Ｘ方向に位置を違えて２つの係止凸部４０が形成されている。蓋部３２の－Ｙ方向の端縁３２ｄにも、Ｘ方向に位置を違えて２つの係止凸部４０が形成されている。 As shown in FIG. 2, two locking protrusions 40 are formed at different positions in the X direction on the +Y edge 32c of the lid 32. Two locking protrusions 40 are also formed at different positions in the X direction on the -Y edge 32d of the lid 32.
　係止凸部４０は、先端に係止爪部（図示略）が形成されている。係止凸部４０は、本体部３１の係止凹部３９に挿入される。係止凸部４０の係止爪部は、本体部３１に係止する。これにより、蓋部３２は、本体部３１に着脱自在に結合される。 The locking protrusion 40 has a locking claw portion (not shown) formed at its tip. The locking protrusion 40 is inserted into the locking recess 39 of the main body 31. The locking claw portion of the locking protrusion 40 locks into the main body 31. This allows the lid 32 to be detachably connected to the main body 31.
　外装体３は、第２アンテナ２に対して固定されていない。すなわち、外装体３は、第２アンテナ２に対して非固定である。 The exterior body 3 is not fixed to the second antenna 2. In other words, the exterior body 3 is not fixed to the second antenna 2.
　ＲＦタグ１０は、例えば、ゴム、樹脂などで構成される成形品に設置することができる。例えば、ＲＦタグ１０は、成形品に埋設することができる。成形品は、例えば、弾性体であり、弾性変形可能である。成形品に伸び、曲げなどの変形が生じた場合、第２アンテナ２に、外力が作用する可能性がある。例えば、延出部２２に、Ｘ方向に沿って外装体３から離れる方向の引張力が作用することが考えられる。延出部２２には、Ｘ方向に沿って外装体３に近づく方向の力が作用することも考えられる。本実施形態のように、ＲＦタグ１０をタイヤに設置する際には、ＲＦタグ１０を、ゴム製のシートから成る固定部材（ラミネーションゴム）に内包するようにして設けることができる。これにより、ＲＦタグ１０の破損を確実に防止できるだけでなく、ＲＦタグ１０を固定部材で内包した後に、ＲＦＩＤタグ１０をタイヤに組み込むようにすれば、ＲＦＩＤタグ１０を容易にかつ破損のおそれなくタイヤ１に組み込むことができる。 The RF tag 10 can be installed in a molded product made of, for example, rubber, resin, etc. For example, the RF tag 10 can be embedded in the molded product. The molded product is, for example, an elastic body and can be elastically deformed. When the molded product is stretched, bent, or otherwise deformed, an external force may act on the second antenna 2. For example, a tensile force may act on the extension 22 in the X direction away from the exterior body 3. A force may also act on the extension 22 in the X direction toward the exterior body 3. As in this embodiment, when the RF tag 10 is installed in a tire, the RF tag 10 can be provided so as to be encapsulated in a fixing member (lamination rubber) made of a rubber sheet. This not only reliably prevents damage to the RF tag 10, but also allows the RFID tag 10 to be easily incorporated into the tire 1 without risk of damage if the RF tag 10 is encapsulated in a fixing member before being incorporated into the tire.
［ＲＦタグが奏する効果］
　ＲＦタグ１０では、第２アンテナ２の電磁界結合部２１が線径方向（電磁界結合部２１の長さ方向に直交する方向）に変位可能な状態でアンテナ保持溝３４に収容される（図６参照）。電磁界結合部２１が変位可能であるため、第２アンテナ２に外力が作用した場合に、第２アンテナ２における応力を緩和することができる。よって、第２アンテナ２の破損を起こりにくくすることができる。これに対し、第２アンテナが外装体に固定されている場合には、第２アンテナに外力が作用すると、外装体から延出する第２アンテナの基端部（根元部分）に応力が集中し、この箇所で破損が起こりやすくなる可能性がある。 [Effects of RF tags]
In the RF tag 10, the electromagnetic field coupling portion 21 of the second antenna 2 is accommodated in the antenna holding groove 34 in a state in which it is displaceable in the radial direction (the direction perpendicular to the length direction of the electromagnetic field coupling portion 21) (see FIG. 6). Since the electromagnetic field coupling portion 21 is displaceable, when an external force acts on the second antenna 2, the stress in the second antenna 2 can be alleviated. Therefore, the second antenna 2 can be made less likely to be damaged. In contrast, when the second antenna is fixed to the exterior body, when an external force acts on the second antenna, stress is concentrated on the base end (root portion) of the second antenna extending from the exterior body, and this portion may be more likely to be damaged.
　第２アンテナ２の電磁界結合部２１は、第１アンテナ１２の外周縁１２ａに沿う形状を有するため、電磁界結合部２１を第１アンテナ１２に十分に電磁界結合させることができる。アンテナ保持溝３４は、第１アンテナ１２の外周縁１２ａに沿って形成されているため、第２アンテナ２の電磁界結合部２１を、第１アンテナ１２に沿って配置することができる。よって、電磁界結合部２１を第１アンテナ１２に十分に電磁界結合させることができる。 The electromagnetic field coupling portion 21 of the second antenna 2 has a shape that follows the outer peripheral edge 12a of the first antenna 12, so that the electromagnetic field coupling portion 21 can be sufficiently electromagnetically coupled to the first antenna 12. The antenna holding groove 34 is formed along the outer peripheral edge 12a of the first antenna 12, so that the electromagnetic field coupling portion 21 of the second antenna 2 can be positioned along the first antenna 12. Therefore, the electromagnetic field coupling portion 21 can be sufficiently electromagnetically coupled to the first antenna 12.
　第２アンテナ２の電磁界結合部２１は、湾曲形状（例えば、半楕円形状）を有するため、第２アンテナ２に外力が作用した場合でも、矩形状の場合に比べ、応力集中が生じにくい。よって、第２アンテナ２の破損を起こりにくくすることができる。これに対し、電磁界結合部が矩形状である場合には、第２アンテナに外力が作用すると、角部（屈曲部）に応力が集中し、この箇所で破損が起こりやすくなる可能性がある。 Since the electromagnetic field coupling portion 21 of the second antenna 2 has a curved shape (e.g., a semi-elliptical shape), even when an external force acts on the second antenna 2, stress concentration is less likely to occur compared to when the shape is rectangular. This makes it possible to make the second antenna 2 less likely to be damaged. In contrast, if the electromagnetic field coupling portion is rectangular, when an external force acts on the second antenna, stress will concentrate at the corners (bends), and damage may be more likely to occur at these points.
　アンテナ保持溝３４は、基板１の外周縁１３ａに沿って形成されているため、第２アンテナ２の電磁界結合部２１を、第１アンテナ１２に沿って配置することができる。よって、電磁界結合部２１を第１アンテナ１２に十分に電磁界結合させることができる。 The antenna holding groove 34 is formed along the outer peripheral edge 13a of the substrate 1, so that the electromagnetic field coupling portion 21 of the second antenna 2 can be positioned along the first antenna 12. This allows the electromagnetic field coupling portion 21 to be sufficiently electromagnetically coupled to the first antenna 12.
　外装体３は、本体部３１と、主面３１ａに重ねられる蓋部３２とを備える。基板保持凹部３７およびアンテナ保持溝３４は、主面３１ａに形成されている。そのため、蓋部３２によって、基板１および第２アンテナ２が本体部３１から脱落するのを阻止することができる。よって、基板１および第２アンテナ２を外装体３に安定的に保持することができる。 The exterior body 3 comprises a main body portion 31 and a lid portion 32 that is overlaid on the main surface 31a. The board holding recess 37 and the antenna holding groove 34 are formed on the main surface 31a. Therefore, the lid portion 32 can prevent the board 1 and the second antenna 2 from falling off the main body portion 31. Therefore, the board 1 and the second antenna 2 can be stably held in the exterior body 3.
　ＲＦタグ１０では、外装体３の側端縁３１ｂに、Ｙ方向（主面３１ａに沿う方向）に延びるスリット状の側端開口３６が形成されている。そのため、第２アンテナ２は外装体３に対してＹ方向に位置変動できる。したがって、第２アンテナ２に外力が作用した場合に、変位により応力を緩和しやすくなる。よって、第２アンテナ２の破損を起こりにくくすることができる。 In the RF tag 10, a slit-shaped side end opening 36 extending in the Y direction (direction along the main surface 31a) is formed on the side end edge 31b of the exterior body 3. Therefore, the position of the second antenna 2 can be moved in the Y direction relative to the exterior body 3. Therefore, when an external force acts on the second antenna 2, the stress is easily alleviated by the displacement. This makes it possible to make the second antenna 2 less likely to be damaged.
　例えば、ＲＦタグ１０では、基板１の外周縁１３ａおよび第１アンテナ１２の外周縁１２ａは全周にわたって湾曲形状であるが、基板および第１アンテナは、外周縁の一部が湾曲形状であってもよい。外装体３は、本体部３１と蓋部３２とを備えるが、外装体の構成は特に限定されない。例えば、外装体は、蓋部を備えていなくてもよい。外装体は板状に限らず、他の形状（ブロック状等）であってもよい。 For example, in the RF tag 10, the outer periphery 13a of the substrate 1 and the outer periphery 12a of the first antenna 12 are curved all around, but the substrate and the first antenna may have only a portion of their outer periphery curved. The exterior body 3 includes a main body portion 31 and a lid portion 32, but the configuration of the exterior body is not particularly limited. For example, the exterior body does not have to include a lid portion. The exterior body is not limited to being plate-shaped, and may have other shapes (such as a block shape).
　上記のように、通信装置１０は、アンテナ部を有する。アンテナ部は、延在方向に直交する方向に頂点で折り返されて往復しながら延在方向に（所定のピッチ間隔で）所定の形状が繰り返し配列されてなる部分（延出部２２）を有する。当該部分（延出部２２）の形状は、具体的には、蛇行形状、波状、又はジグザグ状が例示される。 As described above, the communication device 10 has an antenna section. The antenna section has a portion (extension section 22) in which a predetermined shape is repeatedly arranged (at a predetermined pitch interval) in the extension direction while folding back and forth at an apex in a direction perpendicular to the extension direction. Specific examples of the shape of this portion (extension section 22) include a serpentine shape, a wave shape, and a zigzag shape.
＜空気入りタイヤ＞
　次に、製造する空気入りタイヤについて説明する。図７は、空気入りタイヤのタイヤ幅方向断面図である。図７は、タイヤ赤道面ＣＬを境界とするタイヤ幅方向の一方の半部のみを示しているが、他方の半部についても同様の構成である。一方で、空気入りタイヤは、タイヤ赤道面ＣＬを境界として、非対称な部分を有していても良い。 <Pneumatic tires>
Next, the pneumatic tire to be manufactured will be described. Fig. 7 is a cross-sectional view in the tire width direction of the pneumatic tire. Fig. 7 shows only one half in the tire width direction bounded by the tire equatorial plane CL, but the other half has a similar configuration. On the other hand, the pneumatic tire may have an asymmetric portion bounded by the tire equatorial plane CL.
　この空気入りタイヤ５０は、乗用車用タイヤであるが、他の用途に適したタイヤ（例えば重荷重用タイヤ）としても良い。 This pneumatic tire 50 is a passenger vehicle tire, but it may also be a tire suitable for other uses (e.g., a heavy-duty tire).
　タイヤの内部構造は特には限定されないが、以下の構成を例示することができる。このタイヤ５０は、一対のビード部５１と、ビード部５１に連なる一対のサイドウォール部５２と、一対のサイドウォール部５２に連なるトレッド部５３とを備えている。ビード部５１には、ビードコア５１ａが埋設され、ビードコア５１ａのタイヤ径方向外側にはビードフィラ５１ｂが配置されている。また、このタイヤ５０は、一対のビード部５０間をトロイダル状に跨る、１枚以上のカーカスプライからなるカーカス５４を備えている。カーカスプライは、ラジアル配列のカーカスコードをゴム被覆してなる。本例では、カーカスコードは、スチールコードからなる。カーカスプライの枚数は、特に限定されない。また、カーカスコードの径は、特には限定されないが、０．５～１．５ｍｍとすることができる。 The internal structure of the tire is not particularly limited, but the following configuration can be exemplified. The tire 50 has a pair of bead portions 51, a pair of sidewall portions 52 connected to the bead portions 51, and a tread portion 53 connected to the pair of sidewall portions 52. A bead core 51a is embedded in the bead portion 51, and a bead filler 51b is arranged on the tire radial outer side of the bead core 51a. The tire 50 also has a carcass 54 consisting of one or more carcass plies that spans the pair of bead portions 50 in a toroidal shape. The carcass ply is made of radially arranged carcass cords coated with rubber. In this example, the carcass cords are made of steel cords. The number of carcass plies is not particularly limited. The diameter of the carcass cord is not particularly limited, but can be 0.5 to 1.5 mm.
　カーカス５４のクラウン部のタイヤ径方向外側には、１層以上（図示例で２層）のベルト層５５ａ、５５ｂからなるベルト５５が配置され、ベルト５５のタイヤ径方向外側にはトレッドゴムが配置されている。ベルト５５のベルトコードは、本例では、有機繊維のコードである。ベルトコードは、タイヤ周方向に対して、例えば３０～６０°の傾斜角度で傾斜することができる。ベルト層の層数や、ベルト幅は特に限定されない。 A belt 55 consisting of one or more belt layers 55a, 55b (two layers in the illustrated example) is arranged on the radially outer side of the crown portion of the carcass 54, and tread rubber is arranged on the radially outer side of the belt 55. In this example, the belt cord of the belt 55 is an organic fiber cord. The belt cord can be inclined at an inclination angle of, for example, 30 to 60 degrees with respect to the circumferential direction of the tire. There are no particular limitations on the number of belt layers or the belt width.
　このタイヤ５０は、通信装置としてのＲＦタグ１０を備えている。ＲＦタグは、ＩＣチップとアンテナとを備える。ＲＦタグは、例えば、タイヤを構成する同種又は異種の複数の部材の間の位置に挟み込まれて配置されてよい。このようにすることで、タイヤ生産時にＲＦタグを取り付け易く、ＲＦタグを備えるタイヤの生産性を向上させることができる。本例では、ＲＦタグは、例えば、ビードフィラと、ビードフィラに隣接するその他の部材と、の間に挟み込まれて配置されてよい。ＲＦタグは、タイヤを構成するいずれかの部材内に埋設されていてもよい。このようにすることで、タイヤを構成する複数の部材の間の位置に挟み込まれて配置される場合と比較して、ＲＦタグに加わる負荷を低減できる。これにより、ＲＦタグの耐久性を向上させることができる。本例では、ＲＦタグは、例えば、トレッドゴム、サイドゴム等のゴム部材内に埋設されてよい。ＲＦタグは、タイヤ幅方向断面視でのタイヤ外面に沿う方向であるペリフェリ長さ方向において、剛性の異なる部材の境界となる位置に、配置されないことが好ましい。このようにすることで、ＲＦタグは、剛性段差に基づき歪みが集中し易い位置に、配置されない。そのため、ＲＦタグに加わる負荷を低減できる。これにより、ＲＦタグの耐久性を向上させることができる。本例では、ＲＦタグは、例えば、タイヤ幅方向断面視でカーカスの端部と、このカーカスの端部に隣接する部材（例えばサイドゴム等）と、の境界となる位置に配置されないことが好ましい。ＲＦタグの数は特に限定されない。タイヤは、１個のみのＲＦタグを備えてもよく、２個以上のＲＦタグを備えてもよい。ここでは、通信装置の一例として、ＲＦタグを例示説明しているが、ＲＦタグとは異なる通信装置であってもよい。 This tire 50 is equipped with an RF tag 10 as a communication device. The RF tag includes an IC chip and an antenna. The RF tag may be, for example, sandwiched between a plurality of members of the same or different types that constitute the tire. In this way, the RF tag can be easily attached during tire production, and the productivity of tires equipped with an RF tag can be improved. In this example, the RF tag may be, for example, sandwiched between a bead filler and another member adjacent to the bead filler. The RF tag may be embedded in any of the members that constitute the tire. In this way, the load applied to the RF tag can be reduced compared to when the RF tag is sandwiched between a plurality of members that constitute the tire. This can improve the durability of the RF tag. In this example, the RF tag may be, for example, embedded in a rubber member such as a tread rubber or a side rubber. It is preferable that the RF tag is not placed at a position that is a boundary between members with different rigidity in the periphery length direction, which is a direction along the outer surface of the tire in a cross-sectional view in the tire width direction. In this way, the RF tag is not placed in a position where distortion is likely to concentrate due to a rigidity step. Therefore, the load applied to the RF tag can be reduced. This can improve the durability of the RF tag. In this example, it is preferable that the RF tag is not placed at a position that is, for example, a boundary between the end of the carcass and a member adjacent to the end of the carcass (e.g., a side rubber, etc.) in a cross-sectional view in the tire width direction. The number of RF tags is not particularly limited. A tire may include only one RF tag, or may include two or more RF tags. Here, an RF tag is illustrated as an example of a communication device, but a communication device other than the RF tag may also be used.
　ＲＦタグは、例えば、タイヤのトレッド部に配置されてよい。このようにすることで、ＲＦタグは、タイヤのサイドカットにより損傷しない。ＲＦタグは、例えば、タイヤ幅方向において、トレッド中央部に配置されてよい。トレッド中央部は、トレッド部において撓みが集中し難い位置である。このようにすることで、ＲＦタグに加わる負荷を低減できる。これにより、ＲＦタグの耐久性を向上させることができる。また、タイヤ幅方向でのタイヤの両外側からのＲＦタグとの通信性に差が生じることを抑制できる。本例では、ＲＦタグは、例えば、タイヤ幅方向において、タイヤ赤道面を中心としてトレッド幅の１／２の範囲内に配置されてよい。ＲＦタグは、例えば、タイヤ幅方向において、トレッド端部に配置されてもよい。ＲＦタグと通信するリーダーの位置が予め決まっている場合には、ＲＦタグは、例えば、このリーダーに近い一方側のトレッド端部に配置されてよい。本例では、ＲＦタグは、例えば、タイヤ幅方向において、トレッド端を外端とする、トレッド幅の１／４の範囲内に配置されてよい。 The RF tag may be placed, for example, in the tread portion of the tire. In this way, the RF tag is not damaged by a side cut of the tire. The RF tag may be placed, for example, in the center of the tread in the tire width direction. The center of the tread is a position in the tread portion where bending is unlikely to concentrate. In this way, the load applied to the RF tag can be reduced. This improves the durability of the RF tag. In addition, it is possible to suppress the occurrence of differences in communication with the RF tag from both outer sides of the tire in the tire width direction. In this example, the RF tag may be placed, for example, within a range of 1/2 the tread width centered on the tire equatorial plane in the tire width direction. The RF tag may be placed, for example, at the tread end in the tire width direction. If the position of the reader that communicates with the RF tag is predetermined, the RF tag may be placed, for example, at the tread end on one side closer to the reader. In this example, the RF tag may be placed, for example, within a range of 1/4 the tread width in the tire width direction, with the tread end as the outer end.
　ＲＦタグは、例えば、ビード部間に跨る、１枚以上のカーカスプライを含むカーカスより、タイヤ内腔側に配置されてよい。このようにすることで、タイヤの外部から加わる衝撃や、サイドカットや釘刺さりなどの損傷に対して、ＲＦタグが損傷し難くなる。一例として、ＲＦタグは、カーカスのタイヤ内腔側の面に密着して配置されてよい。別の一例として、カーカスよりタイヤ内腔側に別の部材がある場合に、ＲＦタグは、例えば、カーカスと、このカーカスよりタイヤ内腔側に位置する別の部材と、の間に配置されてもよい。カーカスよりタイヤ内腔側に位置する別の部材としては、例えば、タイヤ内面を形成するインナーライナーが挙げられる。別の一例として、ＲＦタグは、タイヤ内腔に面するタイヤ内面に取り付けられていてもよい。ＲＦタグが、タイヤ内面に取り付けられる構成とすることで、ＲＦタグのタイヤへの取り付け、及び、ＲＦタグの点検・交換が行い易い。つまり、ＲＦタグの取り付け性及びメンテナンス性を向上させることができる。また、ＲＦタグが、タイヤ内面に取り付けられることで、ＲＦタグをタイヤ内に埋設する構成と比較して、ＲＦタグがタイヤ故障の核となることを防ぐことができる。また、カーカスが、複数枚のカーカスプライを備え、複数枚のカーカスプライが重ねられている位置がある場合に、ＲＦタグは、重ねられているカーカスプライの間に配置されていてもよい。 The RF tag may be arranged, for example, on the tire cavity side of the carcass, which includes one or more carcass plies that span between the bead portions. In this way, the RF tag is less likely to be damaged by impacts applied from outside the tire, or damage such as side cuts and nail penetration. As an example, the RF tag may be arranged in close contact with the surface of the carcass on the tire cavity side. As another example, when there is another member on the tire cavity side of the carcass, the RF tag may be arranged, for example, between the carcass and another member located on the tire cavity side of the carcass. An example of another member located on the tire cavity side of the carcass is an inner liner that forms the tire inner surface. As another example, the RF tag may be attached to the tire inner surface facing the tire cavity. By configuring the RF tag to be attached to the tire inner surface, it is easy to attach the RF tag to the tire and to inspect and replace the RF tag. In other words, the ease of attachment and maintenance of the RF tag can be improved. In addition, by attaching the RF tag to the inner surface of the tire, the RF tag can be prevented from becoming the core of tire failure, compared to a configuration in which the RF tag is embedded in the tire. In addition, if the carcass has multiple carcass plies and there is a position where multiple carcass plies are overlapped, the RF tag may be positioned between the overlapped carcass plies.
　ＲＦタグは、例えば、タイヤのトレッド部で、１枚以上のベルトプライを含むベルトより、タイヤ径方向の外側に配置されてよい。一例として、ＲＦタグは、ベルトに対してタイヤ径方向の外側で、当該ベルトに密着して配置されてよい。また、別の一例として、補強ベルト層を備える場合、当該補強ベルト層に対してタイヤ径方向の外側で、当該補強ベルト層に密着して配置されてよい。また、別の一例として、ＲＦタグは、ベルトよりタイヤ径方向の外側で、トレッドゴム内に埋設されていてもよい。ＲＦタグが、タイヤのトレッド部で、ベルトよりタイヤ径方向の外側に配置されることで、タイヤ径方向でのタイヤの外側からのＲＦタグとの通信が、ベルトにより阻害され難い。そのため、タイヤ径方向でのタイヤの外側からのＲＦタグとの通信性を向上させることができる。また、ＲＦタグは、例えば、タイヤのトレッド部で、ベルトよりタイヤ径方向の内側に配置されていてもよい。このようにすることで、ＲＦタグのタイヤ径方向の外側がベルトに覆われるため、ＲＦタグは、トレッド面からの衝撃や釘刺さりなどに対して損傷し難くなる。この一例として、ＲＦタグは、タイヤのトレッド部で、ベルトと、当該ベルトよりタイヤ径方向の内側に位置するカーカスと、の間に配置されてよい。また、ベルトが、複数枚のベルトプライを備える場合に、ＲＦタグは、タイヤのトレッド部で、任意の２枚のベルトプライの間に配置されてよい。このようにすることで、ＲＦタグのタイヤ径方向の外側が１枚以上のベルトプライに覆われるため、ＲＦタグは、トレッド面からの衝撃や釘刺さりなどに対して損傷し難くなる。 The RF tag may be arranged, for example, in the tread portion of the tire, on the tire radial outside of the belt including one or more belt plies. As an example, the RF tag may be arranged on the tire radial outside of the belt and in close contact with the belt. As another example, when a reinforcing belt layer is provided, the RF tag may be arranged on the tire radial outside of the reinforcing belt layer and in close contact with the reinforcing belt layer. As another example, the RF tag may be embedded in the tread rubber on the tire radial outside of the belt. By arranging the RF tag on the tire radial outside of the belt in the tread portion of the tire, communication with the RF tag from the outside of the tire in the tire radial direction is less likely to be hindered by the belt. Therefore, it is possible to improve communication with the RF tag from the outside of the tire in the tire radial direction. Also, the RF tag may be arranged, for example, in the tire tread portion of the tire, on the tire radial inside of the belt. In this way, the tire radial outside of the RF tag is covered by the belt, so that the RF tag is less likely to be damaged by impacts from the tread surface or nail penetration. As one example, the RF tag may be placed in the tread portion of the tire, between the belt and the carcass located radially inward of the belt. Also, if the belt has multiple belt plies, the RF tag may be placed in the tread portion of the tire, between any two belt plies. In this way, the outer side of the RF tag in the tire radial direction is covered by one or more belt plies, making the RF tag less susceptible to damage from impacts from the tread surface or nail penetration.
　トラック・バス用タイヤの場合、ＲＦタグは、例えば、クッションゴムと、トレッドゴムとの間やクッションゴムと、サイドゴムと、の間に挟み込まれて配置されてよい。このようにすることで、ＲＦタグへの衝撃を、クッションゴムにより緩和できる。そのため、ＲＦタグの耐久性を向上させることができる。また、ＲＦタグは、例えば、クッションゴム内に埋設されていてもよい。更に、クッションゴムは、隣接する同種又は異種の複数のゴム部材から構成されてよい。かかる場合に、ＲＦタグは、クッションゴムを構成する複数のゴム部材の間に挟み込まれて配置されてもよい。 In the case of truck and bus tires, the RF tag may be arranged, for example, sandwiched between the cushion rubber and the tread rubber, or between the cushion rubber and the side rubber. In this way, the impact on the RF tag can be mitigated by the cushion rubber. This improves the durability of the RF tag. The RF tag may also be embedded, for example, in the cushion rubber. Furthermore, the cushion rubber may be made up of multiple adjacent rubber members of the same or different types. In such cases, the RF tag may be arranged, sandwiched between the multiple rubber members that make up the cushion rubber.
　ＲＦタグは、例えば、タイヤのサイドウォール部又はビード部の位置に配置されてよい。ＲＦタグは、例えば、ＲＦタグと通信可能なリーダーに対して近い一方側のサイドウォール部又は一方側のビード部に配置されてよい。このようにすることで、ＲＦタグとリーダーとの通信性を高めることができる。一例として、ＲＦタグは、カーカスと、サイドゴムと、の間やトレッドゴムとサイドゴムと、の間に配置されてよい。ＲＦタグは、例えば、タイヤ径方向において、タイヤ最大幅となる位置と、トレッド面の位置と、の間に配置されてよい。このようにすることで、ＲＦタグがタイヤ最大幅となる位置よりタイヤ径方向の内側に配置される構成と比較して、タイヤ径方向でのタイヤの外側からのＲＦタグとの通信性を高めることができる。ＲＦタグは、例えば、タイヤ最大幅となる位置よりタイヤ径方向の内側に配置されていてもよい。このようにすることで、ＲＦタグは、剛性の高いビード部近傍に配置される。そのため、ＲＦタグに加わる負荷を低減できる。これにより、ＲＦタグの耐久性を向上させることができる。一例として、ＲＦタグは、ビードコアとタイヤ径方向又はタイヤ幅方向で隣接する位置に配置されてよい。ビードコア近傍は歪みが集中し難い。そのため、ＲＦタグに加わる負荷を低減できる。これにより、ＲＦタグの耐久性を向上させることができる。特に、ＲＦタグは、タイヤ最大幅となる位置よりタイヤ径方向の内側であって、かつ、ビード部のビードコアよりタイヤ径方向の外側の位置に配置されることが好ましい。このようにすることで、ＲＦタグの耐久性を向上させることができるとともに、ＲＦタグとリーダーとの通信が、ビードコアにより阻害され難く、ＲＦタグの通信性を高めることができる。また、サイドゴムがタイヤ径方向に隣接する同種又は異種の複数のゴム部材から構成されている場合に、ＲＦタグは、サイドゴムを構成する複数のゴム部材の間に挟み込まれて配置されていてもよい。 The RF tag may be arranged, for example, at the sidewall or bead of the tire. The RF tag may be arranged, for example, at one sidewall or one bead that is closer to a reader that can communicate with the RF tag. In this way, the communication between the RF tag and the reader can be improved. As an example, the RF tag may be arranged between the carcass and the side rubber, or between the tread rubber and the side rubber. The RF tag may be arranged, for example, in the tire radial direction, between the position where the tire is at its maximum width and the position of the tread surface. In this way, the communication with the RF tag from the outside of the tire in the tire radial direction can be improved compared to a configuration in which the RF tag is arranged on the inner side in the tire radial direction from the position where the tire is at its maximum width. The RF tag may be arranged, for example, on the inner side in the tire radial direction from the position where the tire is at its maximum width. In this way, the RF tag is arranged near the bead portion that has high rigidity. Therefore, the load applied to the RF tag can be reduced. This can improve the durability of the RF tag. As an example, the RF tag may be arranged at a position adjacent to the bead core in the tire radial direction or tire width direction. Distortion is less likely to concentrate near the bead core. This reduces the load on the RF tag. This improves the durability of the RF tag. In particular, it is preferable that the RF tag is placed radially inward from the maximum tire width position and radially outward from the bead core of the bead portion. This improves the durability of the RF tag, and communication between the RF tag and the reader is less likely to be hindered by the bead core, improving the communication performance of the RF tag. In addition, when the side rubber is composed of multiple rubber members of the same or different types adjacent in the tire radial direction, the RF tag may be sandwiched between the multiple rubber members that make up the side rubber.
　ＲＦタグは、ビードフィラと、このビードフィラに隣接する部材と、の間に挟み込まれて配置されてよい。このようにすることで、ビードフィラを配置することにより歪みが集中し難くなった位置に、ＲＦタグを配置することができる。そのため、ＲＦタグに加わる負荷を低減できる。これにより、ＲＦタグの耐久性を向上させることができる。ＲＦタグは、例えば、ビードフィラと、カーカスと、の間に挟み込まれて配置されていてもよい。カーカスのうちビードフィラと共にＲＦタグを挟み込む部分は、ビードフィラに対してタイヤ幅方向の外側に位置してもよく、タイヤ幅方向の内側に位置してもよい。カーカスのうちビードフィラと共にＲＦタグを挟み込む部分が、ビードフィラに対してタイヤ幅方向の外側に位置する場合には、タイヤ幅方向のタイヤの外側からの衝撃や損傷により、ＲＦタグに加わる負荷を、より低減できる。これにより、ＲＦタグの耐久性を、より向上させることができる。また、ビードフィラは、サイドゴムと隣接して配置されている部分を備えてもよい。かかる場合に、ＲＦタグは、ビードフィラと、サイドゴムと、の間に挟み込まれて配置されていてもよい。更に、ビードフィラは、ゴムチェーファーと隣接して配置されている部分を備えてもよい。かかる場合に、ＲＦタグは、ビードフィラと、ゴムチェーファーと、の間に挟み込まれて配置されていてもよい。 The RF tag may be sandwiched between the bead filler and a member adjacent to the bead filler. In this way, the RF tag can be placed in a position where distortion is less likely to concentrate due to the placement of the bead filler. Therefore, the load on the RF tag can be reduced. This improves the durability of the RF tag. The RF tag may be sandwiched between the bead filler and the carcass, for example. The portion of the carcass that sandwiches the RF tag together with the bead filler may be located on the outside in the tire width direction relative to the bead filler, or may be located on the inside in the tire width direction. When the portion of the carcass that sandwiches the RF tag together with the bead filler is located on the outside in the tire width direction relative to the bead filler, the load on the RF tag due to impact or damage from the outside of the tire in the tire width direction can be further reduced. This improves the durability of the RF tag. The bead filler may also have a portion that is located adjacent to the side rubber. In such a case, the RF tag may be disposed by being sandwiched between the bead filler and the side rubber. Furthermore, the bead filler may have a portion disposed adjacent to the rubber chafer. In such a case, the RF tag may be disposed by being sandwiched between the bead filler and the rubber chafer.
　ＲＦタグは、スティフナーと、このスティフナーに隣接する部材と、の間に挟み込まれて配置されてよい。このようにすることで、スティフナーを配置することにより歪みが集中し難くなった位置に、ＲＦタグを配置することができる。そのため、ＲＦタグに加わる負荷を低減できる。これにより、ＲＦタグの耐久性を向上させることができる。ＲＦタグは、例えば、スティフナーと、サイドゴムと、の間に挟み込まれて配置されてよい。また、ＲＦタグは、例えば、スティフナーと、カーカスと、の間に挟み込まれて配置されていてもよい。カーカスのうちスティフナーと共にＲＦタグを挟み込む部分は、スティフナーに対してタイヤ幅方向の外側に位置してもよく、タイヤ幅方向の内側に位置してもよい。カーカスのうちスティフナーと共にＲＦタグを挟み込む部分が、スティフナーに対してタイヤ幅方向の外側に位置する場合には、タイヤ幅方向のタイヤの外側からの衝撃や損傷により、ＲＦタグに加わる負荷を、より低減できる。これにより、ＲＦタグの耐久性を、より向上させることができる。スティフナーは、ゴムチェーファーと隣接して配置されている部分を備えてもよい。かかる場合に、ＲＦタグは、スティフナーと、ゴムチェーファーと、の間に挟み込まれて配置されていてもよい。スティフナーは、タイヤ幅方向の外側でハットゴムに隣接する部分を備えてもよい。かかる場合に、ＲＦタグは、スティフナーと、ハットゴムと、の間に挟み込まれて配置されていてもよい。スティフナーは、硬さの異なる複数のゴム部材から構成されてよい。かかる場合に、ＲＦタグは、スティフナーを構成する複数のゴム部材の間に挟み込まれて配置されていてもよい。ＲＦタグは、ハットゴムと、このハットゴムに隣接する部材と、の間に挟み込まれて配置されてよい。ＲＦタグは、例えば、ハットゴムと、カーカスプライと、の間に挟み込まれて配置されてよい。このようにすることで、ＲＦタグへの衝撃を、ハットゴムにより緩和できる。そのため、ＲＦタグの耐久性を向上させることができる。 The RF tag may be sandwiched between the stiffener and a member adjacent to the stiffener. In this way, the RF tag can be placed in a position where the stiffener makes it difficult for distortion to concentrate. Therefore, the load on the RF tag can be reduced. This improves the durability of the RF tag. The RF tag may be sandwiched between the stiffener and the side rubber, for example. The RF tag may also be sandwiched between the stiffener and the carcass, for example. The part of the carcass that sandwiches the RF tag together with the stiffener may be located on the outside in the tire width direction relative to the stiffener, or may be located on the inside in the tire width direction. When the part of the carcass that sandwiches the RF tag together with the stiffener is located on the outside in the tire width direction relative to the stiffener, the load on the RF tag due to impact or damage from the outside of the tire in the tire width direction can be further reduced. This improves the durability of the RF tag. The stiffener may have a part that is located adjacent to the rubber chafer. In this case, the RF tag may be sandwiched between the stiffener and the rubber chafer. The stiffener may have a portion adjacent to the hat rubber on the outer side in the tire width direction. In this case, the RF tag may be sandwiched between the stiffener and the hat rubber. The stiffener may be composed of a plurality of rubber members having different hardness. In this case, the RF tag may be sandwiched between a plurality of rubber members constituting the stiffener. The RF tag may be sandwiched between the hat rubber and a member adjacent to the hat rubber. The RF tag may be sandwiched between, for example, the hat rubber and the carcass ply. In this way, the impact on the RF tag can be mitigated by the hat rubber. Therefore, the durability of the RF tag can be improved.
　ＲＦタグは、例えば、ゴムチェーファーと、サイドゴムと、の間に挟み込まれて配置されてよい。このようにすることで、ゴムチェーファーを配置することにより歪みが集中し難くなった位置に、ＲＦタグを配置することができる。そのため、ＲＦタグに加わる負荷を低減できる。これにより、ＲＦタグの耐久性を向上させることができる。ＲＦタグは、例えば、ゴムチェーファーと、カーカスと、の間に挟み込まれて配置されていてもよい。このようにすることで、リムから加わる衝撃や損傷により、ＲＦタグに加わる負荷を低減できる。そのため、ＲＦタグの耐久性を向上させることができる。 The RF tag may be arranged, for example, sandwiched between the rubber chafer and the side rubber. In this way, the RF tag can be arranged in a position where distortion is less likely to be concentrated due to the placement of the rubber chafer. This makes it possible to reduce the load on the RF tag. This makes it possible to improve the durability of the RF tag. The RF tag may be arranged, for example, sandwiched between the rubber chafer and the carcass. In this way, it makes it possible to reduce the load on the RF tag due to impacts and damage from the rim. This makes it possible to improve the durability of the RF tag.
　トラック・バス用タイヤの場合、ＲＦタグは、ナイロンチェーファーと、このナイロンチェーファーのタイヤ幅方向の外側又は内側で隣接する別の部材と、の間に挟み込まれて配置されていてもよい。このようにすることで、タイヤ変形時に、ＲＦタグの位置が変動し難くなる。そのため、タイヤ変形時にＲＦタグに加わる負荷を低減できる。これにより、ＲＦタグの耐久性を向上させることができる。ナイロンチェーファーは、例えば、タイヤ幅方向外側で、ゴムチェーファーと隣接する部分を備えてもよい。かかる場合に、ＲＦタグは、ナイロンチェーファーと、ゴムチェーファーと、の間に挟み込まれて配置されていてもよい。ナイロンチェーファーは、例えば、タイヤ幅方向外側で、サイドゴムと隣接する部分を備えてもよい。かかる場合に、ＲＦタグは、ナイロンチェーファーと、サイドゴムと、の間に挟み込まれて配置されていてもよい。ナイロンチェーファーは、例えば、タイヤ幅方向内側で、スティフナーと隣接する部分を備えてもよい。かかる場合に、ＲＦタグは、ナイロンチェーファーと、スティフナーと、の間に挟み込まれて配置されていてもよい。また、ナイロンチェーファーは、例えば、タイヤ幅方向内側で、ハットゴムと隣接する部分を備えてもよい。かかる場合に、ＲＦタグは、ナイロンチェーファーと、ハットゴムと、の間に挟み込まれて配置されていてもよい。更に、ナイロンチェーファーは、例えば、タイヤ幅方向内側で、カーカスと隣接する部分を備えてもよい。かかる場合に、ＲＦタグは、ナイロンチェーファーと、カーカスと、の間に挟み込まれて配置されていてもよい。更に、ナイロンチェーファーは、例えば、タイヤ幅方向内側で、ワイヤーチェーファーと隣接する部分を備えてもよい。かかる場合に、ＲＦタグは、ナイロンチェーファーと、ワイヤーチェーファーと、の間に挟み込まれて配置されていてもよい。このように、ＲＦタグは、ナイロンチェーファーと、このナイロンチェーファーのタイヤ幅方向の外側又は内側で隣接する別の部材と、の間に挟み込まれて配置されていてよい。特に、ＲＦタグのタイヤ幅方向外側が、ナイロンチェーファーに覆われることで、タイヤ幅方向でのタイヤの外側からの衝撃や損傷により、ＲＦタグに加わる負荷を、より低減できる。そのため、ＲＦタグの耐久性を、より向上させることができる。 In the case of truck and bus tires, the RF tag may be sandwiched between the nylon chafer and another member adjacent to the nylon chafer on the outer or inner side in the tire width direction. In this way, the position of the RF tag is less likely to fluctuate when the tire deforms. Therefore, the load applied to the RF tag when the tire deforms can be reduced. This improves the durability of the RF tag. The nylon chafer may have a portion adjacent to the rubber chafer, for example, on the outer side in the tire width direction. In such a case, the RF tag may be sandwiched between the nylon chafer and the rubber chafer. The nylon chafer may have a portion adjacent to the side rubber, for example, on the outer side in the tire width direction. In such a case, the RF tag may be sandwiched between the nylon chafer and the side rubber. The nylon chafer may have a portion adjacent to the stiffener, for example, on the inner side in the tire width direction. In such a case, the RF tag may be sandwiched between the nylon chafer and the stiffener. Moreover, the nylon chafer may have a portion adjacent to the hat rubber, for example, on the inner side in the tire width direction. In such a case, the RF tag may be disposed by being sandwiched between the nylon chafer and the hat rubber. Furthermore, the nylon chafer may have a portion adjacent to the carcass, for example, on the inner side in the tire width direction. In such a case, the RF tag may be disposed by being sandwiched between the nylon chafer and the carcass. Furthermore, the nylon chafer may have a portion adjacent to the wire chafer, for example, on the inner side in the tire width direction. In such a case, the RF tag may be disposed by being sandwiched between the nylon chafer and the wire chafer. In this way, the RF tag may be disposed by being sandwiched between the nylon chafer and another member adjacent to the outer side or inner side of the nylon chafer in the tire width direction. In particular, by covering the outer side of the RF tag in the tire width direction with the nylon chafer, the load applied to the RF tag due to impact or damage from the outside of the tire in the tire width direction can be further reduced. This can further improve the durability of the RF tag.
　ＲＦタグは、ワイヤーチェーファーと、このワイヤーチェーファーのタイヤ幅方向の内側又は外側で隣接する別の部材と、の間に挟み込まれて配置されていてもよい。このようにすることで、タイヤ変形時に、ＲＦタグの位置が変動し難くなる。そのため、タイヤ変形時にＲＦタグに加わる負荷を低減できる。これにより、ＲＦタグの耐久性を向上させることができる。ワイヤーチェーファーがタイヤ幅方向の内側又は外側で隣接する別の部材は、例えば、ゴムチェーファーなどのゴム部材であってよい。また、ワイヤーチェーファーがタイヤ幅方向の内側又は外側で隣接する別の部材は、例えば、カーカスであってもよい。 The RF tag may be sandwiched between the wire chafer and another adjacent member on the inside or outside of the wire chafer in the tire width direction. This makes it difficult for the position of the RF tag to fluctuate when the tire deforms. This reduces the load applied to the RF tag when the tire deforms. This improves the durability of the RF tag. The other member adjacent to the wire chafer on the inside or outside of the tire width direction may be, for example, a rubber member such as a rubber chafer. The other member adjacent to the wire chafer on the inside or outside of the tire width direction may be, for example, a carcass.
　ベルトの半径方向外側にベルト補強層をさらに備えてもよい。例えば、ベルト補強層はポリエチレンテレフタレートからなるコードをタイヤ周方向に連続して螺旋状に巻回してなってもよい。ここでコードは、６．９×１０－２Ｎ／ｔｅｘ以上の張力をかけて接着剤処理を施してなり、１６０℃で測定した２９．４Ｎ荷重時の弾性率が２．５ｍＮ／ｄｔｅｘ・％以上であってもよい。さらにベルト補強層はベルト全体を覆うように配置されていてもベルトの両端部のみを覆うように配置されていてもよい。さらにベルト補強層の単位幅あたりの巻き回し密度が幅方向位置で異なっていてもよい。このようにすることで、高速耐久性を低下させることなくロードノイズおよびフラットスポットを低減させることができる。 A belt reinforcing layer may be further provided on the radially outer side of the belt. For example, the belt reinforcing layer may be formed by winding a cord made of polyethylene terephthalate in a continuous spiral shape in the tire circumferential direction. Here, the cord may be adhesive-treated under a tension of 6.9×10 −2 N/tex or more, and may have an elastic modulus of 2.5 mN/dtex·% or more at a load of 29.4 N measured at 160° C. Furthermore, the belt reinforcing layer may be disposed so as to cover the entire belt or to cover only both ends of the belt. Furthermore, the winding density per unit width of the belt reinforcing layer may differ depending on the position in the width direction. In this way, road noise and flat spots can be reduced without reducing high-speed durability.
　本実施形態の空気入りタイヤの製造方法は、通信装置１０を内蔵した空気入りタイヤ５０を製造する方法であって、通信装置１０は、アンテナ部（第２のアンテナ２）を有し、アンテナ部は、延在方向に直交する方向に頂点で折り返されて往復しながら延在方向に所定の形状が繰り返し配列されてなる部分（延出部２２）を有する。 The method for manufacturing a pneumatic tire of this embodiment is a method for manufacturing a pneumatic tire 50 incorporating a communication device 10, and the communication device 10 has an antenna portion (second antenna 2), and the antenna portion has a portion (extension portion 22) in which a predetermined shape is repeatedly arranged in the extension direction while folding back and forth at an apex in a direction perpendicular to the extension direction.
　図８は、アンテナ部に張力を付与する様子を模式的に示した図である。本実施形態の空気入りタイヤの製造方法は、アンテナ部の延在方向外側に張力を与えた状態（図８参照）で、アンテナ部をゴムで被覆する工程を含む。本例では、一方側と他方側とにそれぞれ延出する２つの延出部２２に対し、それぞれ外装体３から離れる方向である延在方向外側に張力を付与している。
　以下、本実施形態の空気入りタイヤの製造方法の作用効果について説明する。 8 is a schematic diagram showing how tension is applied to the antenna portion. The manufacturing method of the pneumatic tire of the present embodiment includes a step of covering the antenna portion with rubber in a state in which tension is applied to the outer side of the extension direction of the antenna portion (see FIG. 8). In this example, tension is applied to the two extension portions 22 extending on one side and the other side, respectively, on the outer side of the extension direction, which is a direction away from the exterior body 3.
Hereinafter, the effects of the method for manufacturing a pneumatic tire according to the present embodiment will be described.
　本発明者は、延在方向に直交する方向に頂点で折り返されて往復しながら延在方向に所定の形状が繰り返し配列されてなる部分を有するアンテナ部は、圧縮側（ＩＣチップに近づく方向）の力による座屈が、故障の主な原因となっていることを突き止めた。
　本実施形態の空気入りタイヤの製造方法は、アンテナ部２２の延在方向外側に張力を与えた状態（図８参照）で、アンテナ部をゴムで被覆する工程を含むため、アンテナ部２２が延在方向外側に引っ張られた状態で空気入りタイヤが完成する。従って、空気入りタイヤにおいて、内蔵された通信部１０の延出部２２に圧縮側の力がかかった際に、残留応力である引っ張り側の力によって、圧縮側の力を緩和することができ、座屈によるアンテナ部の故障を抑制することができる。
　以上のように、本実施形態の空気入りタイヤの製造方法によれば、通信装置のアンテナ部の耐久性を向上させ得る。 The inventor has discovered that the main cause of failure of an antenna section having a portion in which a predetermined shape is repeatedly arranged in the extension direction while folding back and forth at an apex in a direction perpendicular to the extension direction, is buckling due to a force on the compression side (in the direction approaching the IC chip).
The manufacturing method of the pneumatic tire of this embodiment includes a step of covering the antenna portion 22 with rubber while applying tension to the outside in the extension direction of the antenna portion 22 (see FIG. 8), so that the pneumatic tire is completed with the antenna portion 22 pulled outward in the extension direction. Therefore, in the pneumatic tire, when a compressive force is applied to the extension portion 22 of the built-in communication unit 10, the compressive force can be alleviated by the tensile force, which is the residual stress, and failure of the antenna portion due to buckling can be suppressed.
As described above, according to the method for manufacturing a pneumatic tire of the present embodiment, the durability of the antenna portion of the communication device can be improved.
　ここで、アンテナ部２２の延在方向外側に与える張力は、５０～２００Ｎであることが好ましい。５０Ｎ以上とすることにより、上記の効果をより確実に得ることができ、一方で、２００Ｎ以下とすることにより、引っ張りの力によるアンテナ部の故障を生じさせないようにすることができる。 Here, it is preferable that the tension applied to the outside of the extension direction of the antenna part 22 is 50 to 200 N. By making it 50 N or more, the above-mentioned effect can be obtained more reliably, while by making it 200 N or less, it is possible to prevent the antenna part from being damaged by the pulling force.
　別の態様としての空気入りタイヤの製造方法は、通信装置を内蔵した空気入りタイヤを製造する方法であって、アンテナ部の延在方向をタイヤ周方向とした状態でタイヤを拡張する工程を含む。なお、通信装置は、アンテナ部を有し、アンテナ部は、延在方向に直交する方向に頂点で折り返されて往復しながら延在方向に所定の形状が繰り返し配列されてなる部分を有する。 Another aspect of the method for manufacturing a pneumatic tire is a method for manufacturing a pneumatic tire with a built-in communication device, and includes a step of expanding the tire with the extension direction of the antenna portion set to the tire circumferential direction. The communication device has an antenna portion, and the antenna portion has a portion in which a predetermined shape is repeatedly arranged in the extension direction while folding back and forth at an apex in a direction perpendicular to the extension direction.
　この態様によれば、上記工程におけるタイヤ拡張時に、アンテナ部（延出部２２）が、タイヤが拡張する力によってタイヤ周方向に引っ張られることになり、完成したタイヤの通信部のアンテナ部（延出部２２）に、引っ張り側の残留応力を付与することができる。従って、空気入りタイヤにおいて、内蔵された通信部１０の延出部２２に圧縮側の力がかかった際に、残留応力である引っ張り側の力によって、圧縮側の力を緩和することができ、座屈によるアンテナ部の故障を抑制することができる。
　以上のように、この態様の空気入りタイヤの製造方法によっても、通信装置のアンテナ部の耐久性を向上させ得る。 According to this aspect, when the tire is expanded in the above process, the antenna portion (extension portion 22) is pulled in the tire circumferential direction by the tire expansion force, and a tensile residual stress can be imparted to the antenna portion (extension portion 22) of the communication portion of the completed tire. Therefore, when a compressive force is applied to the extension portion 22 of the built-in communication portion 10 in a pneumatic tire, the compressive force can be alleviated by the tensile force, which is the residual stress, and failure of the antenna portion due to buckling can be suppressed.
As described above, the manufacturing method of a pneumatic tire according to this aspect can also improve the durability of the antenna portion of a communication device.
　上記の態様において、タイヤを拡張する工程は、通信装置が、タイヤ最大幅位置よりもタイヤ径方向外側に位置する状態で行うことが好ましい。タイヤ径方向外側ほど拡張率が高いため、内蔵された通信部１０の延出部２２に圧縮側の残留応力を効果的に付与することができるからである。 In the above embodiment, the tire expansion process is preferably performed with the communication device positioned radially outward from the tire's maximum width position. This is because the rate of expansion is higher on the radially outward side of the tire, and therefore compressive residual stress can be effectively imparted to the extension portion 22 of the built-in communication unit 10.
　上記の各製造方法により得られたタイヤは、アンテナ部が、該アンテナ部の延在方向外側に向かう残留応力を有するものである。 　The tires obtained by each of the above manufacturing methods have an antenna portion with residual stress directed outward in the extension direction of the antenna portion.
［国連が主導する持続可能な開発目標（ＳＤＧｓ）への貢献］
　持続可能な社会の実現に向けて、ＳＤＧｓが提唱されている。本発明の一実施形態は「Ｎｏ．１２＿作る責任、つかう責任」および「Ｎｏ．１３＿気候変動に具体的な対策を」などに貢献する技術となり得ると考えられる。 [Contribution to the United Nations-led Sustainable Development Goals (SDGs)]
The SDGs have been proposed to realize a sustainable society. One embodiment of the present invention is considered to be a technology that can contribute to "No. 12 Responsible consumption and production" and "No. 13 Concrete measures against climate change."
１：基板、　２：第２アンテナ、　３：外装体、
１０：ＲＦタグ（通信装置）、　１１：ＲＦＩＤチップ、
１２：第１アンテナ、　１２ａ：外周縁、
２１：電磁界結合部、　２１ａ：端部、　２２：延出部、
３４：アンテナ保持溝、　３７：基板保持凹部（基板保持部）、
５０：空気入りタイヤ、　５１：ビード部、
５２：サイドウォール部、　５３：トレッド部、
５４；カーカス、　５５：ベルト、
ＣＬ：タイヤ赤道面 1: substrate; 2: second antenna; 3: exterior body;
10: RF tag (communication device), 11: RFID chip,
12: first antenna; 12a: outer periphery;
21: electromagnetic field coupling portion; 21a: end portion; 22: extension portion;
34: Antenna holding groove, 37: Substrate holding recess (substrate holding portion),
50: pneumatic tire, 51: bead portion,
52: sidewall portion, 53: tread portion,
54: carcass, 55: belt,
CL: Tire equatorial plane

Claims (4)

  1. 　通信装置を内蔵した空気入りタイヤを製造する方法であって、
    　前記通信装置は、アンテナ部を有し、
    　前記アンテナ部は、延在方向に直交する方向に頂点で折り返されて往復しながら延在方向に所定の形状が繰り返し配列されてなる部分を有し、
    　前記アンテナ部の延在方向外側に張力を与えた状態で、前記アンテナ部をゴムで被覆する工程を含むことを特徴とする、空気入りタイヤの製造方法。     A method for manufacturing a pneumatic tire having a built-in communication device, comprising the steps of:
    The communication device has an antenna unit,
    The antenna portion has a portion in which a predetermined shape is repeatedly arranged in the extension direction while being folded back and forth at a vertex in a direction perpendicular to the extension direction,
    A method for manufacturing a pneumatic tire, comprising: covering the antenna portion with rubber while applying tension to the outside of the antenna portion in an extension direction.
  2. 　前記張力は、５０～２００Ｎである、請求項１に記載の空気入りタイヤの製造方法。 The method for manufacturing a pneumatic tire according to claim 1, wherein the tension is 50 to 200 N.
  3. 　通信装置を内蔵した空気入りタイヤを製造する方法であって、
    　前記通信装置は、アンテナ部を有し、
    　前記アンテナ部は、延在方向に直交する方向に頂点で折り返されて往復しながら延在方向に所定の形状が繰り返し配列されてなる部分を有し、
    　前記アンテナ部の延在方向をタイヤ周方向とした状態でタイヤを拡張する工程を含むことを特徴とする、空気入りタイヤの製造方法。     A method for manufacturing a pneumatic tire having a built-in communication device, comprising the steps of:
    The communication device has an antenna unit,
    The antenna portion has a portion in which a predetermined shape is repeatedly arranged in the extension direction while being folded back and forth at a vertex in a direction perpendicular to the extension direction,
    A method for manufacturing a pneumatic tire, comprising: expanding the tire with the extension direction of the antenna portion aligned in the tire circumferential direction.
  4. 　前記タイヤを拡張する工程は、前記通信装置が、タイヤ最大幅位置よりもタイヤ径方向外側に位置する状態で行う、請求項３に記載の空気入りタイヤの製造方法。 The method for manufacturing a pneumatic tire according to claim 3, wherein the tire expansion process is performed with the communication device positioned radially outward of the maximum tire width position.
PCT/JP2023/022499 2022-10-31 2023-06-16 Pneumatic tyre manufacturing method WO2024095523A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1142915A (en) * 1997-07-30 1999-02-16 Yokohama Rubber Co Ltd:The Transponder installed tire and its manufacture
JP2006507967A (en) * 2002-06-11 2006-03-09 ソシエテ ドゥ テクノロジー ミシュラン Method of embedding a high-frequency antenna in a tire
JP2021084512A (en) * 2019-11-27 2021-06-03 横浜ゴム株式会社 Pneumatic tire

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1142915A (en) * 1997-07-30 1999-02-16 Yokohama Rubber Co Ltd:The Transponder installed tire and its manufacture
JP2006507967A (en) * 2002-06-11 2006-03-09 ソシエテ ドゥ テクノロジー ミシュラン Method of embedding a high-frequency antenna in a tire
JP2021084512A (en) * 2019-11-27 2021-06-03 横浜ゴム株式会社 Pneumatic tire

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