Pneumatic tire

Abstract

A pneumatic tire according to the present invention comprises: a tire body; and a communication device embedded in the tire body or attached to an inner surface of the tire body. The communication device includes a flat antenna, and the communication device is arranged such that an antenna in-plane direction perpendicular to a thickness direction of the flat antenna is along an outer surface of the tire body.

Description

Technical Field

[0001] The present disclosure relates to pneumatic tires. Background Art

[0002] Conventionally, it is known that a pneumatic tire includes a communication device such as an RF (Radio Frequency) tag including a memory for reading and writing data such as tire production management, transportation management, and usage history management (for example, see Patent Document 1). As such a communication device, a configuration including a flat antenna having portions of a defined shape arranged in a repeated pattern has been proposed (for example, see Patent Document 2).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2016-037235

[0006] Patent Document 2: Japanese Patent Application Publication No. 2022-084145 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] When a communication device including a flat antenna (hereinafter also referred to as a "flat antenna") described in Patent Document 2 is applied to a pneumatic tire, the communication performance of the flat antenna may vary depending on the positional orientation of the communication device.

[0009] It would be helpful to provide a pneumatic tire that can improve the communication performance of a communication device including a flat antenna.

[0010] Solutions for solving problems

[0011] A pneumatic tire as a first aspect of the present disclosure is (1)

[0013] A pneumatic tire, comprising:

[0014] The tire body; and

[0015] a communication device embedded in the tire body or attached to the inner surface of the tire body, wherein:

[0016] The communication device includes a flat antenna, and

[0017] The communication device is arranged so that an antenna in-plane direction perpendicular to a thickness direction of the flat antenna is along an outer surface of the tire body.

[0018] A pneumatic tire as an embodiment of the present disclosure is (2)

[0020] The pneumatic tire according to (1) above, wherein:

[0021] The communication device further comprises:

[0022] a substrate including an IC chip; and

[0023] an outer casing configured to hold the flat antenna and the substrate on a holding surface, wherein:

[0024] The communication device is arranged so that the holding surface of the exterior body faces the outer surface side of the tire body.

[0025] A pneumatic tire as an embodiment of the present disclosure is (3)

[0027] The pneumatic tire according to (1) above, wherein:

[0028] The communication device further comprises:

[0029] a substrate including an IC chip; and

[0030] an outer casing configured to hold the flat antenna and the substrate on a holding surface, wherein:

[0031] The communication device is arranged so that a surface of the exterior body on the opposite side of the holding surface faces the outer surface side of the tire body.

[0032] A pneumatic tire as an embodiment of the present disclosure is (4)

[0034] The pneumatic tire according to any one of (1) to (3) above, wherein the flat antenna is a flat linear antenna extending in a serpentine, wavy, or meandering shape along the antenna in-plane direction.

[0035] A pneumatic tire as an embodiment of the present disclosure is (5)

[0037] The pneumatic tire according to (4) above, wherein:

[0038] The communication device is embedded in the side wall portion of the tire body in one direction along the tire radial direction relative to the folded-back end of the tire body, and

[0039] A tip of the flat wire antenna is not arranged at a position corresponding to an end of the flat wire antenna in another direction along the tire radial direction.

[0040] A pneumatic tire as an embodiment of the present disclosure is (6)

[0042] The pneumatic tire according to the above (5), wherein the distal end of the flat wire antenna terminates facing the one direction along the tire radial direction.

[0043] Effects of the Invention

[0044] According to the present disclosure, it is possible to provide a pneumatic tire capable of improving the communication performance of a communication device including a flat antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] [ Figure 1 ] Figure 1 It is a tire width direction cross-sectional view of a pneumatic tire as an embodiment of the present disclosure.

[0046] [ Figure 2 ] Figure 2 is a plan view of a communication device.

[0047] [ Figure 3 ] Figure 3 It is a perspective view of a communication device.

[0048] [ Figure 4 ] Figure 4 This is a perspective view of the communication device with the cover of the outer casing removed.

[0049] [ Figure 5 ] Figure 5 It is an exploded perspective view of a communication device.

[0050] [ Figure 6 ] Figure 6 is a plan view of a flat antenna.

[0051] [ Figure 7 ] Figure 7 It is a partial cross-sectional view of a communication device.

[0052] [ Figure 8 ] Figure 8 It's a picture. Figure 1 An enlarged view of the area near the communication device in a side view of the pneumatic tire is shown.

[0053] [ Fig. 9 ] Fig. 9 It's a picture. Figure 1 Figures showing variants of the communication device with different orientations.

[0054] [ Fig.10 ] Fig.10 It's a picture. Figure 1 A diagram showing the change in position of a communication device. DETAILED DESCRIPTION

[0055] Hereinafter, an example of an embodiment of a pneumatic tire according to the present disclosure will be described with reference to the accompanying drawings. In each of the drawings, the same structure is denoted by the same reference numeral.

[0056] Figure 1 : is a tire width direction cross-sectional view of a pneumatic tire 50 as an embodiment of a pneumatic tire according to the present disclosure. Figure 1 As shown, the pneumatic tire 50 includes a tire body 60 and a communication device 10. Hereinafter, for convenience of explanation, the pneumatic tire 50 is also simply referred to as "tire 50".

[0057] Figure 1 Only one half in the tire width direction C defined by the tire equatorial plane CL of the tire 50 is illustrated, but the same structure is used for the other half except for the presence / absence of the communication device 10. However, the tire 50 may include an asymmetric portion bounded by the tire equatorial plane CL.

[0058] Figure 1 The tire 50 shown is a tire for a truck or bus, but the tire 50 may be other heavy duty tires or a tire for a passenger vehicle.

[0059] [Tire body 60]

[0060] The internal structure of the tire body 60 is not particularly limited. The following construction is an example. The tire body 60 includes 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 sidewall portions 52. In each bead portion 51, a bead core 51a is buried, and a reinforcement 51b is arranged on the outside of the bead core 51a in the tire radial direction E. According to the present embodiment, as the reinforcement 51b, a plurality of (two, according to the present embodiment) reinforcements 51b1, 51b2 of different hardness are included. The reinforcement 51b1 arranged on the inner side in the tire radial direction E is harder than the reinforcement 51b2 arranged on the outer side in the tire radial direction E.

[0061] In addition, the tire body 60 includes a carcass 54 consisting of one or more carcass plies extending annularly between a pair of bead portions 51. The carcass 54 is wound around the bead core 51a and folded back from the inner side to the outer side in the tire width direction C, extending to the folded end 54a. The carcass ply can be a meridian array of carcass cords covered with rubber. In this example, the carcass cords are composed of steel cords. The number of carcass plies is not particularly limited. The diameter of the carcass cord is not particularly limited and can be, for example, 0.8 mm to 1.2 mm.

[0062] The belt 55 composed of one or more layers (four layers in the example shown) of belt plies 55a to 55d is arranged on the outer side of the crown portion of the carcass 54 in the tire radial direction E. The tread rubber 53a is arranged on the outer side of the belt 55 in the tire radial direction E. According to the present example, the belt cords of the belt 55 are steel cords. For example, the belt cords may be angled relative to the tire circumferential direction F, such as an inclination angle of 30° to 60°. The number of layers of the belt and the belt width are not particularly limited. In addition, as Figure 1 As shown, the cushion rubber 53 b may be arranged near the end of the belt 55 .

[0063] In addition to the bead core 51a and the reinforcement 51b, the bead portion 51 also includes a rubber bead filler 51c, a nylon bead filler 51d, a steel wire bead filler 51e and a cap rubber 51f. In addition, from the bead portion 51 to the sidewall portion 52, the sidewall rubber 52a is arranged on the outer side of the carcass 54 in the tire width direction C.

[0064] The outer surface of the tire body 60 according to the present embodiment is constituted by the rubber chafer 51 c of the bead portion 51 , the sidewall rubber 52 a of the bead portion 51 and the sidewall portion 52 , and the tread rubber 53 a of the tread portion 53 .

[0065] In addition, the inner surface of the tire body 60 according to the present embodiment faces the tire inner cavity 60 a and is constituted by the inner liner 56 extending over the bead portion 51 , the sidewall portion 52 , and the tread portion 53 .

[0066] [Communication device 10]

[0067] Figure 2 : is a plan view of the communication device 10. The communication device 10 according to the present embodiment is an RF tag.

[0068] Figure 3 It is a perspective view of the communication device 10 . Figure 4 It is a perspective view of the communication device 10 with the cover portion 32 of the exterior body 3 removed. Figure 5 It is an exploded perspective view of the communication device 10 . Figure 6 is a plan view of the flat antenna 2. Figure 7 It is a partial cross-sectional view of the communication device 10 . Figure 7 yes Figure 3 II cross-section diagram in.

[0069] like Figure 2 and Figure 3 As shown, the communication device 10 includes a substrate 1, a flat antenna 2 and an outer casing 3. In the following, for the convenience of explanation, the holding surface 31a (see Figure 4 )'s vertical ( Figure 2 The left and right directions in the image are called the X direction. Figure 2 The other direction along the X direction (to the right in Figure 2 The holding surface 31a (see Figure 4 ) is referred to as the Y direction. In the plane along the holding surface 31a, the Y direction is orthogonal to the X direction. A direction along the Y direction (in Figure 2 The other direction along the Y direction (in Figure 2 The direction perpendicular to the holding surface 31a of the outer body 3 is called the Z direction. The Z direction is perpendicular to the X and Y directions. The view seen from the Z direction is called the plan view (see FIG. Figure 2 ). The Z axis is the central axis along the Z direction.

[0070] like Figure 4 As shown, the substrate 1 includes an IC chip 11 , an antenna 12 and a base material 13 .

[0071] The substrate 13 is formed into a plate-like shape. The shape of the substrate 13 in the plan view is not particularly limited. Preferably, at least a portion of the outer periphery 13a is a curved shape. The curved shape may be, for example, an elliptical arc, a circular arc, a high-order curve shape (for example, a quadratic curve), etc. Examples of high-order curve shapes include parabolic shapes, hyperbolic shapes, etc. The outer shape of the substrate 13 in the plan view may be, for example, an ellipse, a circle, an oval (racetrack shape), etc. The outer shape of the substrate 13 in the plan view is preferably non-circular. According to the present embodiment, the substrate 13 is an elliptical shape. The substrate 13 is oriented so that the major axis length is along the X direction. A glass epoxy substrate, a ceramic, a plastic film, etc. may be used as the substrate 13.

[0072] The IC chip 11 can read and write information in a contactless manner via the antenna 12 and the flat antenna 2. The IC chip 11 is mounted on a substrate 13.

[0073] The antenna 12 is a conductive layer formed on one side of the substrate 13, for example. The conductive layer is composed of, for example, a conductive foil, an electroplated layer, a conductive ink layer, etc. The conductive foil is a metal foil composed of, for example, copper, silver, gold, platinum, aluminum, etc. The conductive foil is formed into a defined shape by etching, etc. The electroplated layer is composed of metals such as copper, silver, gold, platinum, aluminum, etc. The conductive ink layer is formed by printing, etc. using conductive ink. The conductive ink contains conductive particles formed of metals, carbon materials, etc.

[0074] The antenna 12 is in a loop shape. The antenna 12 is, for example, in a curved shape along the outer periphery 13 a of the substrate 13 . The antenna 12 is formed in an elliptical loop. The antenna 12 is electrically connected to the IC chip 11 .

[0075] The flat antenna 2 is a booster antenna. The flat antenna 2 is, for example, linear. The flat antenna 2 is formed of a metal such as steel, stainless steel, copper, copper alloy, etc. For example, the flat antenna 2 can be formed of a brass-plated steel wire. The flat antenna 2 is independent of the substrate 1. The flat antenna 2 is configured to extend in an antenna in-plane direction B (in-plane direction of the XY plane according to the present embodiment) perpendicular to the thickness direction A (Z direction according to the present embodiment), and the flat antenna 2 is not limited to a flat linear antenna composed of a linear body as in the present embodiment. The flat antenna 2 can be, for example, a flat plate-shaped antenna composed of a plate-shaped body.

[0076] The flat antenna 2 includes an electromagnetic field combining portion 21 and a pair of extension portions 22. The electromagnetic field combining portion 21 is a curved shape. Here, "curved shape" refers to a smoothly curved shape without a sharp bend. As a curved shape, examples include an elliptical arc, a circular arc, a high-order curve shape (for example, a quadratic curve), etc. As a high-order curve shape, examples include a parabolic shape, a hyperbolic shape, etc. The electromagnetic field combining portion 21 is a semi-elliptical shape. In detail, the electromagnetic field combining portion 21 is a semi-elliptical shape extending from one vertex of the elliptical shape (the vertex intersecting the major axis) to the other vertex (the vertex intersecting the major axis).

[0077] The shape of the electromagnetic field coupling part 21 in a plan view surrounds at least a portion of the substrate 1. The electromagnetic field coupling part 21 surrounds the range (semicircle range on the +Y direction side) from one vertex (vertex intersecting the long axis) to the other vertex (vertex intersecting the long axis) of the elliptical substrate 1.

[0078] The electromagnetic field combining portion 21 is a curved shape (e.g., an elliptical arc) along the outer periphery 12a of the antenna 12 in a plan view. The gap distance between the electromagnetic field combining portion 21 and the outer periphery 12a is approximately constant. The electromagnetic field combining portion 21 is arranged near the outer periphery 13a outside the outer periphery 13a of the substrate 1 in a plan view. The shape of the electromagnetic field combining portion 21 is along the shape of the outer periphery 13a in a plan view. The gap distance between the electromagnetic field combining portion 21 and the outer periphery 13a is approximately constant.

[0079] The electromagnetic field coupling part 21 couples the electromagnetic field with the antenna 12 in a non-contact manner. The electromagnetic field coupling is, for example, one of electric field coupling or magnetic field coupling. The shape of the cross section perpendicular to the longitudinal direction of the electromagnetic field coupling part 21 is, for example, a circle (see FIG. Figure 7 ).

[0080] The extension portion 22 extends from one end 21a and the other end 21a of the electromagnetic field coupling portion 21 respectively. Figure 6As shown, the first extension portion 22A, which is one of the pair of extension portions 22, extends in the -X direction while meandering from the end portion 21a in the -X direction of the electromagnetic field combining portion 21. The second extension portion 22B, which is the other of the pair of extension portions 22, extends in the +X direction while meandering from the end portion 21a in the +X direction of the electromagnetic field combining portion 21.

[0081] The plan view shape of the extension portion 22 is, for example, a meandering shape, a wave shape, a zigzag shape, etc. The extension portion 22 has a meandering shape.

[0082] like Figure 5 As shown, the extension portions 22 each include a plurality of straight portions 23 and a plurality of return portions 24. The straight portion 23 is a straight line along the Y direction. The plurality of straight portions 23 are spaced apart in the X direction. The return portions 24 connect the ends of adjacent straight portions 23. The return portions 24 each have a curved shape (e.g., an arc shape).

[0083] Among the plurality of straight portions 23, the straight portion 23 closest to the electromagnetic field combining portion 21 is referred to as the "first straight portion 23A". Among the plurality of straight portions 23, the straight portion 23 second closest to the electromagnetic field combining portion 21 is referred to as the "second straight portion 23B". Among the plurality of straight portions 23, the straight portion 23 third closest to the electromagnetic field combining portion 21 is referred to as the "third straight portion 23C". The return portion 24 connecting the first straight portion 23A and the second straight portion 23B is referred to as the "first return portion 24A". The return portion 24 connecting the second straight portion 23B and the third straight portion 23C is referred to as the "second return portion 24B".

[0084] The first straight portion 23A extends from the end 21a of the electromagnetic field coupling portion 21 in the -Y direction. The first return portion 24A bends from the -Y direction end of the first straight portion 23A and extends to the -Y direction end of the second straight portion 23B. In the extension portion 22, a portion of the first return portion 24A and the first straight portion 23A are inside the outer body 3, and the other portion of the extension portion 22 extends outside the outer body 3 (see FIG. Figure 4 ).

[0085] The exterior body 3 holds the substrate 1 and the flat antenna 2 on the holding surface 31 a .

[0086] More specifically, if Figure 3 As shown, according to the present embodiment, the outer body 3 includes a plate-shaped main body 31 and a plate-shaped cover 32. One side of the main body 31 in the thickness direction is a holding surface 31a. In the communication device 10 according to the present embodiment, in a state where the substrate 1 and the flat antenna 2 are held on the holding surface 31a of the main body 31, the cover 32 is attached to cover the holding surface 31a of the main body 31. As a result, the entire substrate 1 and a part of the flat antenna 2 are stored between the holding surface 31a of the main body 31 and the cover 32.

[0087] The main body 3 has a plate-like shape as a whole. The main body 31 and the cover 32 are formed of, for example, resin. As the resin, examples include polyamide resins such as nylon 6,6; polyester resins such as polyethylene terephthalate (PET); polyolefin resins such as polyethylene; fluorine-containing vinyl resins such as polyvinyl fluoride; vinyl polymers such as polyvinyl chloride; acrylic resins such as polymethyl methacrylate; and the like.

[0088] like Figure 5 As shown, the main body 31 has a rectangular shape in a plan view. One side of the main body 31, that is, the holding surface 31a has a substrate holding recess 37 (substrate holding portion), an antenna holding groove 34 and a pair of side recesses 35. The substrate holding recess 37 is formed by the substrate holding protrusion 33. The substrate holding recess 37 is a recess surrounded by the substrate holding protrusion 33.

[0089] The substrate holding protrusion 33 is an annular rib-like protrusion. The substrate holding protrusion 33 is curved along the outer peripheral edge 13a of the substrate 1 (for example, an ellipse). The substrate holding protrusion 33 protrudes from the holding surface 31a in the +Z direction. The shape of the cross section perpendicular to the longitudinal direction of the substrate holding protrusion 33 is, for example, a rectangle. The substrate holding protrusion 33 is curved along the outer peripheral edge 12a of the antenna 12 in a plan view (for example, an ellipse).

[0090] The substrate holding recess 37 holds the substrate 1. The substrate holding recess 37 has a shape (e.g., an elliptical shape) along the outer peripheral edge 13a of the substrate 1. The inner dimension (inner diameter) of the substrate holding recess 37 is substantially the same as or slightly larger than the outer dimension (outer diameter) of the substrate 1. In a plan view, the substrate holding recess 37 has a shape similar to that of the substrate 1.

[0091] When the substrate 1 and the substrate holding recess 37 are non-circular shapes (e.g., elliptical shapes), the tilt of the substrate 1 around the Z axis can be restricted and the correct direction of the substrate 1 can be maintained. Therefore, the electromagnetic field coupling between the antenna 12 and the electromagnetic field coupling portion 21 can be maintained.

[0092] The antenna holding groove 34 receives the electromagnetic field coupling portion 21 of the flat antenna 2 (see Figure 4 and Figure 7). The antenna holding groove 34 is formed on the outside of the substrate holding protrusion 33 and is close to the substrate holding protrusion 33. The antenna holding groove 34 has a shape along the substrate holding protrusion 33 in a plan view. The antenna holding groove 34 has a curved shape (for example, an elliptical arc shape) along the outer periphery 12a of the antenna 12 in a plan view. The antenna holding groove 34 has a curved shape (for example, an elliptical arc) along the outer periphery 13a of the substrate 1 in a plan view. The antenna holding groove 34 is a semi-elliptical shape in a plan view. In detail, the antenna holding groove 34 has a semi-elliptical shape extending from one vertex of the elliptical shape (the vertex intersecting the major axis) to the other vertex (the vertex intersecting the major axis).

[0093] The shape of the antenna holding groove 34 in a plan view surrounds at least a portion of the substrate 1. The antenna holding groove 34 surrounds the range (semicircle range on the +Y direction side) from one vertex (the vertex intersecting the long axis) to the other vertex (the vertex intersecting the long axis) of the elliptical substrate 1.

[0094] like Figure 7 As shown, the cross-section perpendicular to the longitudinal direction of the antenna holding groove 34 is, for example, a rectangle. The width (inner dimension) W1 of the antenna holding groove 34 is greater than the outer diameter (outer dimension) D1 of the electromagnetic field coupling part 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). The width W1 of the antenna holding groove 34 is greater than the outer diameter D1 of the electromagnetic field coupling part 21, so the electromagnetic field coupling part 21 is accommodated in the antenna holding groove 34 in a state that it can be displaced in the linear diameter direction (for example, the Y direction). The "linear diameter direction" is perpendicular to the longitudinal direction of the electromagnetic field coupling part 21. The electromagnetic field coupling part 21 can also be displaced in the longitudinal direction relative to the antenna holding groove 34.

[0095] The depth of the antenna holding groove 34 is defined such that the height (inner dimension) H1 from the bottom surface 34a of the antenna holding groove 34 to the cover 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). The height H1 of the antenna holding groove 34 is greater than the outer diameter D1 of the electromagnetic field coupling portion 21, so the electromagnetic field coupling portion 21 is accommodated in the antenna holding groove 34 in a state that it can be displaced in the linear diameter direction (for example, the Z direction).

[0096] like Figure 5 As shown, a side recess 35 is formed on either side of the holding surface 31a. The side recess 35 is formed in a region including the side end edge 31b in the X direction of the main body 31. The inner peripheral edge 35a of each 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.

[0097] The first straight portion 35b starts at the end of the inner periphery of the antenna holding groove 34 and extends in the -Y direction. The curved portion 35c extends from the end of the first straight portion 35b at a gradually decreasing inclination angle relative to the X direction. The second straight portion 35d is a portion extending from the end of the curved portion 35c to the side edge 31b in the X direction.

[0098] like Figure 4 As shown, the side recess 35 includes a portion of the first folded portion 24A and the first straight portion 23A of the flat antenna 2 in a plan view. The first straight portion 23A is close to the first straight portion 35b (see Figure 5 The first folded portion 24A is close to the curved portion 35c (see Figure 5 Each of the side recesses 35 accommodates at least a portion of a limited length range of the flat antenna 2 (a portion of the first folded portion 24A and the first straight portion 23A).

[0099] like Figure 3 As shown, the side recess 35 extends far enough in the Y direction to form a slit-like side end opening 36 in the side end edge 31b extending in the Y direction (in the direction along the holding surface 31a). The flat antenna 2 extends out of the outer body 3 through the side end opening 36. Figure 5 As shown, two locking recesses 39 are formed at different positions along the X direction at the end edge 31c in the +Y direction of the main body 31. The end edge 31d in the -Y direction of the main body 31 also has two locking recesses 39 at different positions along the X direction.

[0100] like Figure 3 As shown, the cover 32 is rectangular in plan view. The cover 32 is the same shape as the main body 31 and is installed to face the holding surface 31a of the main body 31. The cover 32 is installed to overlap the holding surface 31a of the main body 31 in plan view.

[0101] like Figure 7 As shown, the facing surface 32a of the cover 32 is a surface facing the holding surface 31a of the main body 31. A positioning groove 38 is formed on the facing surface 32a. The positioning groove 38 is an annular groove. The shape of the cross section perpendicular to the longitudinal direction of the positioning groove 38 is, for example, a rectangle.

[0102] The positioning groove 38 has a curved shape (e.g., an elliptical shape) corresponding to the substrate holding protrusion 33 and the antenna holding groove 34. The width of the positioning groove 38 in a plan view covers both the substrate 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.

[0103] like Figure 3As shown, two locking projections 40 are formed at different positions along the X direction at the end edge 32c of the cover 32 in the +Y direction. The end edge 32d of the cover 32 in the -Y direction also has two locking projections 40 formed at different positions along the X direction.

[0104] Each locking protrusion 40 has a locking hook portion (not shown) formed at an end thereof. The locking protrusion 40 is inserted into the locking recess 39 of the main body 31. The locking hook portion of the locking protrusion 40 is locked to the main body 31. This allows the cover 32 to be detachably coupled to the main body 31.

[0105] The exterior body 3 is not fixed with respect to the flat antenna 2. That is, the exterior body 3 is not fixed to the flat antenna 2.

[0106] The communication device 10 can be installed in a molded product, for example, made of rubber or resin. For example, the communication device 10 can be buried in a molded product. The molded product is, for example, an elastomer and can be elastically deformed. When the molded product is stretched, bent, or otherwise deformed, the flat antenna 2 may be subjected to external forces. For example, a tensile force may act on the extension 22 in the direction away from the outer body 3 along the X direction. The extension 22 may also be subjected to a force in the direction toward the outer body 3 along the X direction. As in the present embodiment, when the communication device 10 is installed in the tire body 60, the communication device 10 may be installed to be wrapped in a fixing member (laminated rubber) made of a rubber sheet. After the communication device 10 is wrapped in the fixing member, when the communication device 10 is assembled into the tire, this not only helps to prevent damage to the communication device 10, but also allows the communication device 10 to be easily assembled into the tire 50 with less risk of damage.

[0107] [Effects of RFID tags]

[0108] In the communication device 10, the electromagnetic field coupling portion 21 of the flat antenna 2 is accommodated in the antenna holding groove 34 in a state displaceable in the linear diameter direction (a direction perpendicular to the longitudinal direction of the electromagnetic field coupling portion 21) (see FIG. Figure 7 ). The electromagnetic field coupling portion 21 can be displaced, so when an external force acts on the flat antenna 2, the stress in the flat antenna 2 can be relieved. Therefore, damage to the flat antenna 2 is less likely to occur. On the contrary, if the flat antenna is fixed to the outer body, when an external force acts on the flat antenna, the stress will be concentrated on the base end portion (root) of the flat antenna extending from the outer body, and damage is likely to occur at this location.

[0109] The electromagnetic field combining portion 21 of the flat antenna 2 has a shape along the outer periphery 12a of the antenna 12 of the substrate 1, allowing the electromagnetic field combining portion 21 to be fully electromagnetically combined with the antenna 12. The antenna holding groove 34 has a shape along the outer periphery 12a of the antenna 12, so the electromagnetic field combining portion 21 of the flat antenna 2 can be positioned beside the antenna 12. Therefore, the electromagnetic field combining portion 21 can be fully electromagnetically combined with the antenna 12.

[0110] The electromagnetic field coupling portion 21 of the flat antenna 2 is in a curved shape (e.g., a semi-elliptical shape), so even when an external force acts on the flat antenna 2, stress concentration is less likely to occur compared to a rectangular shape. Therefore, damage to the flat antenna 2 is less likely to occur. On the contrary, if the shape of the electromagnetic field coupling portion is rectangular, the external force acting on the flat antenna may cause stress concentration at the corner (curved portion), where damage may easily occur.

[0111] The antenna holding groove 34 has a shape along the outer periphery 13a of the substrate 1, so the electromagnetic field coupling portion 21 of the flat antenna 2 can be positioned beside the antenna 12. Therefore, the electromagnetic field coupling portion 21 can be electromagnetically coupled with the antenna 12 sufficiently.

[0112] The outer housing 3 includes a main body 31 and a cover 32 covering a holding surface 31a. A substrate holding recess 37 and an antenna holding groove 34 are formed on the holding surface 31a. Therefore, the cover 32 prevents the substrate 1 and the flat antenna 2 from falling off from the main body 31. Therefore, the substrate 1 and the flat antenna 2 can be stably held in the outer housing 3.

[0113] In the communication device 10, a slit-shaped side end opening 36 extending in the Y direction (along the holding surface 31a) is formed in the side end edge 31b of the outer body 3. Therefore, the flat antenna 2 can change its position in the Y direction relative to the outer body 3. Therefore, when an external force acts on the flat antenna 2, it is easier to relieve the stress by displacement. Therefore, damage to the flat antenna 2 is less likely to occur.

[0114] For example, in the communication device 10, the outer periphery 13a of the substrate 1 and the outer periphery 12a of the antenna 12 are curved over the entire circumference, but the substrate and the antenna may be curved only on a portion of the outer periphery. The outer casing 3 includes a main body 31 and a cover 32, but the configuration of the outer casing is not particularly limited. For example, the outer casing may be configured not to include a cover. The outer casing is not limited to a plate-like shape, but may be other shapes (e.g., a block shape).

[0115] As described above, the communication device 10 includes the flat antenna 2. Figure 1As shown, the communication device 10 is arranged so that the antenna in-plane direction B (in-plane direction of the XY plane according to the present embodiment) perpendicular to the thickness direction A (Z direction according to the present embodiment) of the flat antenna 2 is along the outer surface of the tire body 60. In other words, the communication device 10 is arranged so that the flat antenna 2 faces the outer surface of the tire body 60 in the thickness direction A.

[0116] More specifically, the communication device 10 according to the present embodiment is buried in the sidewall portion 52. The communication device 10 according to the present embodiment is arranged so that the antenna in-plane direction B of the flat antenna 2 is along the outer surface of the sidewall portion 52 of the tire body 60. In other words, the communication device 10 according to the present embodiment is arranged so that the flat antenna 2 faces the outer surface of the sidewall portion 52 of the tire body 60 in the thickness direction A.

[0117] Specifically, the communication device 10 according to the present embodiment is arranged such that the antenna in-plane direction B of the flat antenna 2 is along the tire radial direction E. In other words, the communication device 10 according to the present embodiment is arranged such that the thickness direction A of the flat antenna 2 is along the tire width direction C.

[0118] Figure 8 It's a picture. Figure 1 The side view of the tire 50 shown in FIG. 1 is an enlarged view of the vicinity of the communication device 10 as viewed from the outside in the tire width direction C. Figure 8 In FIG. 1 , the position of the communication device 10 is indicated by a dotted line. Figure 8 As shown, the communication device 10 is arranged so that the flat antenna 2 extends in the tire circumferential direction F, that is, the communication device 10 according to the present embodiment is arranged so that the X direction is along the tire circumferential direction F.

[0119] In addition, if Figure 1 As shown, the communication device 10 according to the present embodiment is arranged so that the holding surface 31a of the outer body 3 faces the outer surface side of the tire body 60 ( Figure 1 More specifically, the communication device 10 according to the present embodiment is arranged so that the holding surface 31a of the outer body 3 is directly opposite to the outer surface of the tire body 60 in the thickness direction A. This configuration makes it easier to improve the communication device 10 and the outer side of the tire body 60 ( Figure 1 In particular, in the communication device 10 according to the present embodiment, an antenna holding groove 34 (see FIG. 1 ) is formed in the holding surface 31a of the main body 31 of the outer body 3. Figure 7etc.) to accommodate the electromagnetic field coupling portion 21 of the flat antenna 2. Therefore, the communication performance of the flat antenna 2 is better on the opening side of the antenna holding groove 34 than on the bottom surface 34a side of the antenna holding groove 34. That is, in the communication device 10 according to the present embodiment, the flat antenna 2 can improve the communication performance with the reader on the holding surface 31a side of the main body 31, as compared with the communication performance with the back side 31e, that is, the side opposite to the holding surface 31a of the main body 31. Therefore, in terms of the communication performance with the reader outside the tire 50, it is preferable to arrange the communication device 10 so that the holding surface 31a of the outer body 3 faces the outer surface side of the tire body 60 ( Figure 1 on the left side of the image).

[0120] Fig. 9 Pictured Figure 1 Variations of the communication device 10 are shown with different orientations. Fig. 9 As shown, in terms of durability of the flat antenna 2, the communication device 10 may be arranged so that the back surface 31e, which is the opposite side of the holding surface 31a of the outer body 3, faces the outer side of the tire body 60 ( Fig. 9 As an example, the communication device 10 may be arranged so that the back surface 31e, which is the opposite side of the holding surface 31a of the exterior body 3, faces the outer surface of the tire body 60 in the thickness direction A. In particular, in the communication device 10 according to the present embodiment, the antenna holding groove 34 is formed in the holding surface 31a of the main body 31 of the exterior body 3 (see Figure 7 etc.) to accommodate the electromagnetic field coupling portion 21 of the flat antenna 2. Therefore, the durability of the flat antenna 2 outside the tire 50 is better on the bottom surface 34a side of the antenna holding groove 34 than on the opening side of the antenna holding groove 34. That is, in the communication device 10 according to the present embodiment, the durability of the flat antenna 2 on the back surface 31e on the opposite side of the holding surface 31a of the main body 31 is higher than the durability on the holding surface 31a of the main body 31. Therefore, in terms of the durability of the flat antenna 2 outside the tire 50, it is preferable to arrange the communication device 10 so that the back surface 31e of the outer body 3 faces the outer surface side of the tire body 60 ( Fig. 9 on the left side of the image).

[0121] like Figure 1 and Figure 8 As shown, the communication device 10 according to the present embodiment is provided with respect to the folded end 54a of the carcass 54 in one direction along the tire radial direction E (according to the present embodiment, on the outside in the tire radial direction E and at Figure 8 The end 2a of the flat wire antenna as the flat antenna 2 is not arranged at the end of the flat wire antenna in the other direction along the tire radial direction E (according to the present embodiment, the inner side in the tire radial direction E and at the inner side in the tire radial direction E). Figure 8In this way, the end 2a of the flat wire antenna as the flat antenna 2 and the folded end 54a of the carcass 54 are separated from each other. This prevents the position of the end 2a of the flat wire antenna as the flat antenna 2, which is easily subjected to strain concentration due to a rigidity step difference or the like, from becoming closer to the position of the folded end 54a of the carcass 54, thereby improving the durability of the tire 50.

[0122] In particular, if Figure 8 As shown, the end 2a of the flat wire antenna as the flat antenna 2 preferably faces one direction of the tire radial direction E (according to the present embodiment, the outer side in the tire radial direction E and at Figure 8 In this way, the end 2a of the flat wire antenna as the flat antenna 2 and the folded end 54a of the carcass 54 are not arranged so that they face each other along the tire radial direction E. This allows the strain between the end 2a of the flat wire antenna as the flat antenna 2 and the folded end 54a of the carcass 54 to be suppressed, compared with a configuration in which the end 2a of the flat wire antenna as the flat antenna 2 and the folded end 54a of the carcass 54 are arranged so that they face each other in the tire radial direction E. Therefore, the durability 50 of the tire 50 can be further improved.

[0123] In addition, if Figure 8 As shown, the end 2a of the flat wire antenna as the flat antenna 2 is preferably arranged at a position opposite to the flat wire antenna in one direction along the tire radial direction E (in this embodiment, on the outside in the tire radial direction E and at Figure 8 In this way, the end of the flat wire antenna as the flat antenna 2 and the folded end 54a of the carcass 54 can be further separated from each other. As a result, the durability of the tire 50 can be further improved.

[0124] As described above, in the tire 50 according to the present embodiment, the communication device 10 is embedded in the sidewall portion 52 of the tire body 60, but is not limited to this configuration. The communication device 10 may be embedded in other locations of the tire body 60. In addition, the communication device 10 may be attached to the inner surface of the tire body 60 facing the tire inner cavity 60a. Fig.10 An example of a possible position of the communication device 10 in a tire widthwise cross-sectional view of the tire 50 is shown. Fig.10 In addition to Figure 1 , Figure 8 and Fig. 9 The position of the communication device 10 shown (denoted by Fig.10 In addition to the white rectangles in FIG. 1 , examples of possible locations of the communication device 10 are also represented by black rectangles.

[0125] As described above, the communication device 10 according to the present embodiment is an RF tag. Hereinafter, the communication device 10 is also referred to as an RF tag. As described above, the RF tag includes an IC chip 11 and an antenna (according to the present embodiment, the antenna 12 of the substrate 1 and the flat antenna 2). The RF tag can be arranged, for example, at a position sandwiched between a plurality of the same or different types of components constituting the tire body 60. In this way, the RF tag can be easily installed during tire production, improving the productivity of the tire 50 including the RF tag. In this example, the RF tag is arranged in the sidewall portion 52 sandwiched between the reinforcement 51b2 and the sidewall rubber 52a as other components adjacent to the reinforcement 51b2, but can be arranged at other positions. The RF tag can be buried in any component of the tire body 60. In this way, the load applied to the RF tag can be reduced compared to the case where the RF tag is arranged at a position sandwiched between a plurality of components of the tire body 60. This can improve the durability of the RF tag. In this example, the RF tag can be embedded in a rubber member such as a tread rubber 53a, a sidewall rubber 52a, etc. The RF tag is preferably not arranged at the boundary of members of different rigidity in the circumferential direction, which is the direction along the outer surface of the tire in the tire width direction cross-sectional view. In this way, the RF tag is not arranged in a place where strain is easy to concentrate based on the rigidity step difference. This reduces the load applied to the RF tag. This can improve the durability of the RF tag. In this example, the RF tag is preferably not arranged at the boundary between the return end 54a of the carcass 54 and the member adjacent to the return end 54a of the carcass 54 in the tire width direction cross-section. The number of RF tags is not particularly limited. The tire may include only one RF tag, and may include two or more RF tags. Although the RF tag is illustrated here as an example of a communication device, the communication device may be something other than an RF tag.

[0126] The RF tag may be arranged, for example, in the tread portion 53 of the tire body 60. In this way, the RF tag is not damaged by the side cut of the tire 50. The RF tag may be arranged, for example, on the inner surface of the tire of the tread portion 53 of the tire body 60 (see Fig.10 The RF tag may be arranged, for example, at the center of the tread in the width direction C (see FIG. Fig.10 53). The central portion of the tread is a location where deflection in the tread portion 53 is less likely to be concentrated. In this way, the load applied to the RF tag can be reduced. This can improve the durability of the RF tag. In addition, the difference in communication performance between the RF tag and both sides of the tire 50 in the tire width direction C can be suppressed. In this example, the RF tag can be arranged, for example, within 1 / 2 of the tread width in the tire width direction C centered on the tire equatorial plane CL. The RF tag can be arranged, for example, at the tread end in the tire width direction C (see Fig.10 7 and 8 in the figure). When the position of the reader communicating with the RF tag is predetermined, the RF tag can be arranged, for example, on the side of the tread end close to such reader. In this example, the RF tag can be arranged, for example, within 1 / 4 of the tread width in the tire width direction C with the tread end as the outer end.

[0127] The RF tag may be arranged, for example, on the tire inner cavity 60a side of the carcass 54 including one or more carcass plies extending between the bead portions. In this way, the RF tag is less likely to be damaged by an impact applied from the outside of the tire 50 or damage such as side cuts or nail punctures. As an example, the RF tag may be arranged close to the surface of the carcass 54 on the tire inner cavity 60a side (see Fig.10 As another example, when there is another member closer to the tire inner cavity 60a side than the carcass 54, the RF tag may be arranged, for example, between the carcass 54 and the other member closer to the tire inner cavity 60a side than the carcass 54 (see Fig.10 5. The RF tag may be attached to the inner surface of the tire facing the inner cavity 60a (hereinafter also referred to as the "tire inner surface") (see FIG. Fig.10 ”, “P3”, “P12” and “P18” in the figure). By configuring the RF tag to be attached to the inner surface of the tire, the RF tag can be easily attached to the tire body 60, and the inspection and replacement of the RF tag can be easily performed. That is, the convenience of installation and maintenance of the RF tag can be improved. In addition, compared with the configuration in which the RF tag is buried inside the tire body, the RF tag attached to the inner surface of the tire helps prevent the RF tag from becoming the core of tire failure. In addition, when the carcass 54 includes a plurality of carcass plies and there is a position where the plurality of carcass plies overlap, the RF tag can be arranged between the overlapping carcass plies.

[0128] For example, the RF tag may be arranged in the tread portion 53 of the tire body 60 on the outer side in the tire radial direction E of the belt 55 including one or more belt plies 55a to 55d (see FIG. Fig.10 As an example, the RF tag may be arranged on the outside of the belt 55 in the tire radial direction E and in close contact with the belt 55 (see FIG. Fig.10 As another example, when a reinforcement belt layer is included, the RF tag may be arranged on the outer side in the tire radial direction E relative to the reinforcement belt layer and in close contact with the reinforcement belt layer. As another example, the RF tag may be embedded in the tread rubber 53a on the outer side of the belt 55 in the tire radial direction E (see FIG. Fig.10When the RF tag is arranged at the tread portion 53 of the tire body 60 on the outside of the belt 55 in the tire radial direction E, communication with the RF tag from the outside of the tire 50 in the tire radial direction E is less likely to be hindered by the belt 55. This improves the communication performance with the RF tag from the outside of the tire 50 in the tire radial direction E.

[0129] For example, the RF tag may be arranged in the tread portion 53 of the tire body 60 on the inner side of the belt 55 in the tire radial direction E (see FIG. Fig.10 In this way, the RF tag is covered by the belt 55 on the outside in the tire radial direction E, making the RF tag more resistant to damage from impact, nail puncture, etc. on the tread surface. As an example, the RF tag can be arranged in the tread portion 53 of the tire body 60 between the belt 55 and the carcass 54 located on the inner side of the belt 55 in the tire radial direction E (see FIG. Fig.10 ” in the figure (see reference numeral “P6”).

[0130] In addition, when the belt 55 includes a plurality of belt plies 55a to 55d, the RF tag may be arranged between any two of the belt plies 55a to 55d in the tread portion 53 of the tire body 60 (see FIG. Fig.10 In this way, the outer side of the RF tag in the tire radial direction E is covered by one or more belt plies 55a to 55d, making the RF tag more resistant to damage from impacts, nail punctures, etc. from the tread.

[0131] The RF tag may be arranged, for example, to be sandwiched between the cushion rubber 53b and the tread rubber 53a (see Fig.10 ” in the figure) or sandwiched between the cushion rubber 53b and the sidewall rubber 52a (see Fig.10 In this way, the impact on the RF tag can be mitigated by the buffer rubber 53b. Therefore, the durability of the RF tag can be improved.

[0132] In addition, for example, the RF tag may be embedded in the buffer rubber 53b. In addition, the buffer rubber 53b may be constructed as a plurality of adjacent rubber members of the same or different types. In this case, the RF tag may be arranged to be sandwiched between the plurality of rubber members of the buffer rubber 53b (see Fig.10 ” in the figure (see reference numeral “P8”).

[0133] The RF tag can be arranged, for example, at the bead portion 51 or the sidewall portion 52 of the tire body 60. The RF tag can be arranged, for example, at one side of the sidewall portion 52 or the bead portion 51 close to a reader that can communicate with the RF tag. This can improve the communication performance between the RF tag and the reader. As an example, the RF tag can be arranged between the carcass 54 and the sidewall rubber 52a or between the tread rubber 53a and the sidewall rubber 52a.

[0134] For example, the RF tag can be arranged between the maximum width position of the tire and the tread surface position in the tire radial direction E (see Fig.10 In this way, compared with a configuration in which the RF tag is arranged further inside the tire radial direction E than the tire maximum width position, communication with the RF tag from the outside of the tire 50 in the tire radial direction E can be improved.

[0135] The RF tag can be arranged, for example, on the inner side of the tire radial direction E at the tire maximum width position (see Fig.10 In this way, the RF tag is arranged near the bead portion 51 having high rigidity. This reduces the load applied to the RF tag. This can improve the durability of the RF tag. As an example, the RF tag can be arranged adjacent to the bead core 51a in the tire radial direction E or in the tire width direction C (see FIG. Fig.10 51a). Strain is less likely to concentrate near the bead core 51a. This reduces the load applied to the RF tag. This can improve the durability of the RF tag.

[0136] In particular, the RF tag is preferably arranged on the inner side in the tire radial direction E of the tire maximum width position and on the outer side in the tire radial direction E of the bead core 51a of the bead portion 51 (see Fig.10 In this way, the durability of the RF tag can be improved, and the communication between the RF tag and the reader is less likely to be hindered by the bead core 51a, improving the communication performance of the RF tag.

[0137] When the sidewall rubber 52 a includes a plurality of rubber members of the same or different types adjacent to each other in the tire radial direction E, the RF tag may be arranged to be sandwiched between the plurality of rubber members of the sidewall rubber 52 a .

[0138] The RF tag may be arranged to be sandwiched between the reinforcement member 51b and a member adjacent to the reinforcement member 51b (see Fig.1051b and the white rectangle and reference numerals "P14", "P17" and "P22" in the figure). In this way, the RF tag can be arranged at a position where strain is less likely to concentrate due to the position of the reinforcement 51b. This reduces the load applied to the RF tag. This can improve the durability of the RF tag. The RF tag can be arranged, for example, to be sandwiched between the reinforcement 51b and the sidewall rubber 52a (see Fig.10 (white rectangle in the figure).

[0139] In addition, the RF tag may be arranged to be sandwiched between the reinforcing member 51b and the carcass 54 (see Fig.10 The portion of the carcass 54 that sandwiches the RF tag and the reinforcement 51b together may be arranged on the outside in the tire width direction C or on the inside in the tire width direction C relative to the reinforcement 51b. When the portion of the carcass 54 that sandwiches the RF tag and the reinforcement 51b together is on the outside in the tire width direction C relative to the reinforcement 51b, the load on the RF tag due to impact or damage from the outside of the tire 50 in the tire width direction C can be further reduced. This can further improve the durability of the RF tag.

[0140] The reinforcement 51b may include a portion adjacent to the rubber chafer 51c. In this case, the RF tag may be arranged to be sandwiched between the reinforcement 51b and the rubber chafer 51c.

[0141] The reinforcement 51b may include a portion adjacent to the cap rubber 51f on the outer side in the tire width direction C. In this case, the RF tag may be arranged to be sandwiched between the reinforcement 51b and the cap rubber 51f (see Fig.10 ” in the figure (see reference numeral “P14”).

[0142] The reinforcement 51b may be constructed as a plurality of rubber members having different hardnesses. In this case, the RF tag may be arranged to be sandwiched between the plurality of rubber members ( Figure 1 between the reference numerals "51b1" and "51b2" in FIG. Fig.10 Figure 19 (see Figure 19).

[0143] The RF tag may be arranged to be sandwiched between the cap rubber 51f and a member adjacent to the cap rubber 51f (see Fig.10 51f). The RF tag can be arranged to be sandwiched between the cap rubber 51f and the carcass ply, for example. In this way, the impact on the RF tag can be mitigated by the cap rubber 51f. Therefore, the durability of the RF tag can be improved.

[0144] The RF tag may be arranged, for example, to be sandwiched between the rubber chafer 51c and the sidewall rubber 52a (see Fig.10 In this way, the RF tag can be arranged at a position where strain is less likely to concentrate due to the position of the rubber chafer 51c. This reduces the load applied to the RF tag. This can improve the durability of the RF tag.

[0145] The RF tag may be arranged, for example, to be sandwiched between the rubber chafer 51c and the carcass 54. In this way, the load on the RF tag due to impact or damage applied from the rim can be reduced. Therefore, the durability of the RF tag can be improved.

[0146] The RF tag may be arranged to be sandwiched between the nylon chafer 51d and another member adjacent to the outer side or the inner side of the nylon chafer 51d in the tire width direction C (see FIG. Fig.10 In this way, the position of the RF tag is less likely to change during tire deformation. This reduces the load applied to the RF tag during tire deformation. This can improve the durability of the RF tag.

[0147] The nylon bead filler 51d may include, for example, a portion adjacent to the outer side of the rubber bead filler 51c in the tire width direction C. In this case, the RF tag may be arranged to be sandwiched between the nylon bead filler 51d and the rubber bead filler 51c (see Fig.10 ” in the figure). The nylon bead filler 51d may include, for example, a portion adjacent to the outer side of the sidewall rubber 52a in the tire width direction C. In this case, the RF tag may be arranged to be sandwiched between the nylon bead filler 51d and the sidewall rubber 52a (see Fig.10 ” in the figure (see reference numeral “P13”).

[0148] The nylon bead chafer 51d may include, for example, a portion adjacent to the reinforcement 51b on the inner side in the tire width direction C. In this case, the RF tag may be arranged to be sandwiched between the nylon bead chafer 51d and the reinforcement 51b. In addition, the nylon bead chafer 51d may include, for example, a portion adjacent to the cap rubber 51f on the inner side in the tire width direction C. In this case, the RF tag may be arranged to be sandwiched between the nylon bead chafer 51d and the cap rubber 51f (see Fig.1051d). In addition, the nylon bead filler 51d may include, for example, a portion adjacent to the carcass 54 on the inner side in the tire width direction C. In this case, the RF tag may be arranged to be sandwiched between the nylon bead filler 51d and the carcass 54. In addition, the nylon bead filler 51d may include, for example, a portion adjacent to the steel wire bead filler 51e on the inner side in the tire width direction C. In this case, the RF tag may be arranged to be sandwiched between the nylon bead filler 51d and the steel wire bead filler 51e.

[0149] In this way, the RF tag can be arranged to be sandwiched between the nylon chafer 51d1 and another member adjacent to the nylon chafer 51d on the outer side or inner side in the tire width direction C. In particular, the outer side C of the RF tag in the tire width direction is covered by the nylon chafer 51d, which further reduces the load applied to the RF tag due to impact or damage from the outer side of the tire in the tire width direction C. Therefore, the durability of the RF tag can be further improved.

[0150] The RF tag may be arranged to be sandwiched between the steel wire chafer 51e and another member adjacent to the steel wire chafer 51e on the inner side or the outer side in the tire width direction C (see FIG. Fig.10 In this way, the position of the RF tag is less likely to change during tire deformation. This reduces the load applied to the RF tag during tire deformation. This can improve the durability of the RF tag. Another member adjacent to the steel wire chafer 51e on the inner or outer side in the tire width direction C may be, for example, a rubber member such as the rubber chafer 51c (see FIG. Fig.10 Another member adjacent to the steel wire bead filler 51e on the inner side or the outer side in the tire width direction C may be, for example, a carcass 54 (see FIG. Fig.10 ” in the figure (see reference numeral “P20”).

[0151] The pneumatic tire according to the present disclosure is not limited to the specific configurations exemplified by the above-described embodiments and modifications, and various modifications, changes, and combinations are possible without departing from the scope of the claims.

[0152] [Contribution to the Sustainable Development Goals (SDGs) led by the United Nations]

[0153] The Sustainable Development Goals are proposed to achieve a sustainable society. The embodiments of the present disclosure can be considered as technologies that may contribute to "No. 12 Responsible Consumption and Production" and "No. 13 Climate Change".

[0154] Industrial Applicability

[0155] The present disclosure relates to pneumatic tires.

[0156] Description of Reference Numerals

[0157] 1: Substrate

[0158] 2: Flat antenna

[0159] 2a: The end of a flat wire antenna as a flat antenna

[0160] 3: Exterior body

[0161] 10: Communication device

[0162] 11: IC chip

[0163] 12: Antenna

[0164] 12a: Outer periphery

[0165] 13: Base material

[0166] 13a: Outer periphery

[0167] 21: Electromagnetic field combination

[0168] 21a: End of electromagnetic field coupling part

[0169] 22: Extension

[0170] 22A: First extension

[0171] 22B: Second extension

[0172] 23: Straight line

[0173] 23A: First straight line

[0174] 23B: Second straight line

[0175] 23C: The third straight line

[0176] 24: Turnback

[0177] 24A: First return section

[0178] 24B: Second turning section

[0179] 31: Main body

[0180] 31a: Keep the face

[0181] 31b: Lateral edge

[0182] 31c: end edge

[0183] 31d: end edge

[0184] 31e: Back

[0185] 32: cover

[0186] 32a: Opposite surface

[0187] 32c: End edge

[0188] 32d: end edge

[0189] 33: Board holding convex portion

[0190] 34: Antenna holding slot

[0191] 34a: Bottom

[0192] 35: Side concave part

[0193] 35a: Periphery

[0194] 35b: First straight line

[0195] 35c: Bend

[0196] 35d: Second straight line

[0197] 36: Side opening

[0198] 37: Substrate holding recess

[0199] 38: Positioning slot

[0200] 38a: Top

[0201] 39: Locking recess

[0202] 40: Locking convex part

[0203] 50: Tires

[0204] 51: Bead

[0205] 51a: bead core

[0206] 51b, 51b1, 51b2: reinforcement

[0207] 51c: Rubber chafer

[0208] 51d: Nylon chafer

[0209] 51e: Steel bead chafer

[0210] 51f: Cap rubber

[0211] 52: Side wall

[0212] 52a: Sidewall rubber

[0213] 53: Tread

[0214] 53a: Tread rubber

[0215] 53b: Buffer rubber

[0216] 54: Carcass

[0217] 54a: Return end

[0218] 55: Belt

[0219] 55a to 55d: Belt ply

[0220] 56: Lining

[0221] 60: Tire body

[0222] 60a: Tire cavity

[0223] A: Thickness direction of the flat antenna

[0224] B: Antenna plane direction of flat antenna

[0225] C: Tire width direction

[0226] CL: Tire equatorial plane

[0227] D1: The outer diameter of the electromagnetic field coupling part

[0228] E: Tire Radial

[0229] F: Tire circumference

[0230] H1: Height from the bottom of the antenna holding slot to the cover

[0231] W1: Width of the antenna holding slot

[0232] P1 to P23: Position of the communication device

Claims

1. A pneumatic tire comprising: Tire body; and a communication device embedded in the tire body or attached to the inner surface of the tire body, wherein: The communication device includes a flat antenna, and The communication device is arranged so that an antenna in-plane direction perpendicular to a thickness direction of the flat antenna is along an outer surface of the tire body.

2. The pneumatic tire according to claim 1, wherein: The communication device further comprises: a substrate including an IC chip; and an outer casing configured to hold the flat antenna and the substrate on a holding surface, wherein: The communication device is arranged so that the holding surface of the exterior body faces the outer surface side of the tire body.

3. The pneumatic tire according to claim 1, wherein: The communication device further comprises: a substrate including an IC chip; and an outer casing configured to hold the flat antenna and the substrate on a holding surface, wherein: The communication device is arranged so that a surface of the exterior body on the opposite side of the holding surface faces the outer surface side of the tire body.

4. The pneumatic tire according to any one of claims 1 to 3, wherein: The flat antenna is a flat linear antenna extending in a serpentine, wavy or meandering shape along the antenna in-plane direction.

5. The pneumatic tire according to claim 4, wherein: The communication device is embedded in the side wall portion of the tire body in one direction along the tire radial direction relative to the folded-back end of the tire body, and A tip of the flat wire antenna is not arranged at a position corresponding to an end of the flat wire antenna in another direction along the tire radial direction.

6. The pneumatic tire according to claim 5, wherein: The distal end of the flat wire antenna terminates facing the one direction along the tire radial direction.

Images