Antenna device

Abstract

An antenna device includes an antenna body and a housing that houses the antenna body. The antenna body includes a bobbin having a pair of side walls that extend in a first direction and have inner surfaces that face each other in a second direction that intersects the first direction, a winding that is wound around the bobbin so as to entirely surround the pair of side walls with the first direction as an axial direction, and a core that is held by the pair of side walls so as to be positioned inside the winding between the inner surfaces of the pair of side walls. At least one of the inner surfaces of the pair of side walls includes an inclined surface. The inclined surface overlaps the core so as to be closer to the core than the winding in a third direction that intersects the first direction and the second direction, and is inclined so as to be farther from the core in the third direction as closer to the core side in the second direction.

Description

Technical Field

[0001] This disclosure broadly relates to antenna arrangements. More specifically, this disclosure relates to antenna arrangements having a core held inside a winding by a coil. Background Technology

[0002] As an example of an antenna device, Patent Document 1 discloses a vehicle-mounted antenna device. The vehicle-mounted antenna device of Patent Document 1 includes an antenna assembly and a housing. The antenna assembly is integrally composed of a winding tube, a core supported by the winding tube along its length, a coil wound around the core, a capacitor, and first and second connector terminals.

[0003] Prior art literature

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2012-204959 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] In such an antenna device, when an impact is applied to the housing, the impact is transmitted from the housing to the winding tube and from the winding tube to the core, which may result in damage to the core.

[0008] This disclosure provides an antenna device capable of reducing the impact applied to the core.

[0009] Technical solutions for solving the problem

[0010] One embodiment of this disclosure includes an antenna body and a housing accommodating the antenna body. The antenna body has a winding tube, a winding, and a core. The winding tube has a pair of sidewalls extending in a first direction and having inner surfaces opposing each other in a second direction intersecting the first direction. The winding is wound around the winding tube such that it completely surrounds the pair of sidewalls about the first direction as its axis. The core is held by the pair of sidewalls such that it lies inside the winding between the inner surfaces of the pair of sidewalls. At least one of the inner surfaces of the pair of sidewalls includes an inclined surface. The inclined surface overlaps with the core such that it is closer to the core than the winding in a third direction intersecting both the first and second directions, and is inclined such that the closer it is to the core in the second direction, the further away it is from the core in the third direction.

[0011] Invention Effects

[0012] The method disclosed herein can reduce the impact applied to the core. Attached Figure Description

[0013] Figure 1 This is a perspective view of an example structure of an antenna device according to an embodiment.

[0014] Figure 2 yes Figure 1 A sectional view along line AA.

[0015] Figure 3 yes Figure 2 BB line section view.

[0016] Figure 4 yes Figure 3 An enlarged view of the portion shown as P.

[0017] Figure 5 yes Figure 2 CC-line sectional view.

[0018] Figure 6 yes Figure 1 An exploded perspective view of the antenna device.

[0019] Figure 7 yes Figure 1 A top view of the antenna body of the antenna device.

[0020] Figure 8 yes Figure 1 A side view of the antenna body of the antenna device.

[0021] Figure 9 yes Figure 1 A three-dimensional view of the main body of the winding tube of the antenna device.

[0022] Figure 10 yes Figure 1 An illustration of a mechanism in an antenna device for reducing the impact applied to the core.

[0023] Figure 11 This is a partial perspective view of the antenna body of the antenna device in Modified Example 1.

[0024] Figure 12 yes Figure 11 DD-line sectional view.

[0025] Figure 13 This is a partial perspective view of the antenna body of the antenna device in Modified Example 2.

[0026] Figure 14 yes Figure 13 EE line section view.

[0027] Figure 15 This is a cross-sectional view of the antenna device in variation 3. Detailed Implementation

[0028] The embodiments will now be described in detail with appropriate reference to the accompanying drawings. However, sometimes unnecessary details are omitted. For example, detailed descriptions of well-known matters or repetitive descriptions of substantially the same structures are sometimes omitted. This is to avoid making the following description unnecessarily lengthy and to facilitate understanding by those skilled in the art. Furthermore, the inventors have provided the drawings and the following description to enable those skilled in the art to fully understand this disclosure, but they are not intended to limit the subject matter of the claims.

[0029] Unless otherwise specified, positional relationships such as up, down, left, and right are considered to be based on the positional relationships shown in the accompanying drawings. The figures described in the following embodiments are schematic, and the ratios of the size and thickness of each component in the figures may not reflect actual dimensional ratios. Furthermore, the dimensional ratios of each component are not limited to those shown in the accompanying drawings.

[0030] (Implementation Method)

[0031] [1. Summary]

[0032] Figure 1 This is a perspective view of an example of the structure of an antenna device 1 according to an embodiment. Figure 1 The antenna device 1 is, for example, a vehicle-mounted antenna device. The antenna device 1 is installed in the door, dashboard, bumper, etc. of a vehicle, for example, to enable keyless entry.

[0033] Figure 2 yes Figure 1 AA-line sectional view, Figure 3 yes Figure 2 BB line section view, Figure 4 yes Figure 3 An enlarged view of the portion shown as P. Figure 5 yes Figure 2 CC-line sectional view.

[0034] like Figure 1 as well as Figure 2 As shown, the antenna device 1 includes an antenna body 2 and a housing 3 that accommodates the antenna body 2.

[0035] like Figure 2 As shown, the antenna body 2 has a winding tube 7, a winding 61, and a core 8. (As indicated...) Figure 2 as well as Figure 3 As shown, the winding tube 7 has a pair of sidewalls 71a, 71b extending in the first direction D1. Figure 2 as well as Figure 3 As shown, a pair of sidewalls 71a and 71b have inner surfaces 710 that are opposite each other in a second direction D2 that intersects the first direction D1. Figure 2 as well as Figure 3As shown, the winding 61 is wound around the winding tube 7, so that it completely surrounds a pair of sidewalls 71a and 71b with the first direction D1 as the axis. Figure 2 as well as Figure 3 As shown, the core 8 is held by a pair of sidewalls 71a and 71b, such that it lies inside the winding 61 between the inner surfaces 710 of the pair of sidewalls 71a and 71b. Figure 3 As shown, the inner surface 710 of a pair of sidewalls 71a and 71b includes inclined surfaces 711a to 711d. The inclined surfaces 711a to 711d overlap with the core 8 such that they are closer to the core 8 than the winding 61 in the third direction D3, which intersects the first direction D1 and the second direction D2, and are inclined such that the closer they are to the core 8 in the second direction D2, the further away they are from the core 8 in the third direction D3.

[0036] In antenna device 1, such as Figure 3 As shown, the core 8 is located inside the winding 61 between the inner surfaces 710 of a pair of sidewalls 71a and 71b of the winding tube 7. In the antenna device 1, when an impact is applied to the housing 3, the impact is transmitted from the housing 3 to the winding tube 7. Then, when the impact is transmitted from the winding tube 7 to the core 8, it is not the winding 61 but the inclined surfaces 711a to 711d of the winding tube 7 that collide with the core 8. The inclined surfaces 711a to 711d are inclined such that the side closer to the core 8 in the second direction D2 is further away from the core 8 in the third direction D3. Therefore, the impact from the winding tube 7 to the core 8 is distributed in the second direction D2 and the third direction D3, thereby reducing the impact applied to the core 8. Therefore, the possibility of core 8 breakage can be reduced.

[0037] [2. Details]

[0038] The antenna device 1 according to this embodiment will be described in detail below.

[0039] Figure 6 This is an exploded perspective view of antenna device 1. (For example...) Figure 6 As shown, the antenna device 1 includes an antenna body 2, a housing 3, an elastic member 4, and a connector 5.

[0040] Figure 7 This is a top view of antenna body 2. Figure 8 This is a side view of antenna body 2. (As shown) Figure 7 as well as Figure 8 As shown, the antenna body 2 includes windings 61, 62, and 63, a winding tube 7, a core 8, and a capacitor C1. Winding 61 and core 8 together constitute the first inductor. Winding 62 and core 8 together constitute the second inductor. Winding 63 alone constitutes the third inductor.

[0041] The winding tube 7 holds the windings 61, 62, 63, core 8, and capacitor C1. For example... Figure 7 as well as Figure 8As shown, the winding tube 7 is elongated. The winding tube 7 includes a main body 70 and first to fourth connecting members 91 to 94. The main body 70 is formed of a resin material that is insulating and non-magnetic. The first to fourth connecting members 91 to 94 are fixed to the main body 70.

[0042] Figure 9 This is a three-dimensional view of the main body 70 of the winding tube 7. (See diagram below.) Figure 9 As shown, the main body 70 includes a pair of sidewalls 71a and 71b, a first end 72, a second end 73, a retaining plate 74, a roll portion 75, a pair of protrusions 76, and a pair of protrusions 77. The pair of sidewalls 71a and 71b, the first end 72, the second end 73, the retaining plate 74, the roll portion 75, the pair of protrusions 76, and the pair of protrusions 77 are formed as a continuous integral unit.

[0043] A pair of sidewalls 71a and 71b constitute the body of the winding tube 7. The pair of sidewalls 71a and 71b are used for holding the windings 61 and 62, the capacitor C1, and the core 8.

[0044] The pair of sidewalls 71a and 71b are elongated plates. For example... Figure 9 As shown, a pair of sidewalls 71a and 71b are divided into a first region 70a, a second region 70b, and a third region 70c. The first region 70a is the first end of the pair of sidewalls 71a and 71b. Figure 9 The region on the right side (of the first inductor). The first region 70a is used for holding the winding 61 that constitutes the first inductor. The second region 70b is the second end of the pair of sidewalls 71a, 71b. Figure 9 The region on the left side (of the second inductor). The second region 70b is used to hold the winding 62 that constitutes the second inductor. The third region 70c is the region between the first region 70a and the second region 70b of a pair of sidewalls 71a and 71b. The third region 70c is used to hold the capacitor C1.

[0045] A pair of sidewalls 71a and 71b extend in a first direction D1 and have inner surfaces 710 facing each other in a second direction D2 that intersects the first direction D1. In this embodiment, the second direction D2 is orthogonal to the first direction D1. The first direction D1 is the length direction of the pair of sidewalls 71a and 71b. The second direction D2 is the thickness direction of the pair of sidewalls 71a and 71b. In a third direction D3 that intersects both the first direction D1 and the second direction D2, the pair of sidewalls 71a and 71b are larger than the core 8. The dimension of the pair of sidewalls 71a and 71b in the third direction D3 is larger than the dimension of the core 8 in the third direction D3. In this embodiment, the third direction D3 is orthogonal to both the first direction D1 and the second direction D2. The third direction D3 is the width direction of the pair of sidewalls 71a and 71b.

[0046] The core 8 is accommodated in the space between a pair of sidewalls 71a and 71b. More specifically, the core 8 is held by a pair of sidewalls 71a and 71b such that it is located between the inner surfaces 710 of the pair of sidewalls 71a and 71b.

[0047] like Figure 2 As shown, core 8 is a rod-shaped extension in the first direction D1. Core 8 can also be, for example, a prism-shaped extension in the first direction D1. The dimension of core 8 in the first direction D1 is approximately equal to the dimension of the pair of sidewalls 71a, 71b in the first direction D1. That is, core 8 extends approximately the entire length of the pair of sidewalls 71a, 71b. Therefore, as... Figure 7 As shown, core 8 exists in region 1 70a, region 2 70b, and region 3 70c. Core 8 is located inside winding 61. Winding 61 and core 8 together constitute the first inductor. Core 8 is located inside winding 62. Winding 62 and core 8 together constitute the second inductor.

[0048] like Figure 3 As shown, core 8 has two side surfaces 82a and 82b (generally referred to as reference numeral 82) in the second direction D2. Side surfaces 82a and 82b are respectively opposed to the inner surfaces 710 of a pair of sidewalls 71a and 71b. Side surfaces 82a and 82b are parallel and flat surfaces. Core 8 has two side surfaces 83a and 83b (generally referred to as reference numeral 83) in the third direction D3. Side surfaces 83a and 83b are parallel and flat surfaces. The dimension of core 8 in the third direction D3 is smaller than the dimension of core 8 in the second direction D2. Core 8 has four corner portions 81a to 81d (generally referred to as reference numeral 81) in a plane orthogonal to the first direction D1. Corner portions 81 are opposed to the inclined surface 711 of the winding tube 7, which will be described later, in the third direction. That is, core 8 has corner portions 81 that are opposed to the inclined surface 711 in the third direction D3. Each corner 81 is conical. The core 8 is made of ceramic, such as ferrite. Ceramic has high heat resistance.

[0049] In this embodiment, the inner surfaces 710 of the pair of sidewalls 71a and 71b are configured to reduce the transmission of impact from the winding tube 7 to the core 8. (Refer to...) Figure 3 as well as Figure 4 The inner surface 710 of such a pair of sidewalls 71a and 71b will be further described.

[0050] like Figure 3 As shown, the inner surface 710 of sidewall 71a includes inclined surfaces 711a and 711b, a contact surface 712, and connecting surfaces 713a and 713b. The inner surface 710 of sidewall 71b includes inclined surfaces 711c and 711d, a contact surface 712, and connecting surfaces 713c and 713d. In this embodiment, the inner surface 710 of sidewall 71a and the inner surface 710 of sidewall 71b have the same shape, therefore referring to... Figure 4The inner surface of sidewall 71a is described in detail. Furthermore, inclined surfaces 711a, 711b, 711c, and 711d are collectively referred to as 711 in the accompanying drawings. Connecting surfaces 713a, 713b, 713c, and 713d are collectively referred to as 713 in the accompanying drawings.

[0051] like Figure 4 As shown, the inner surface 710 of the sidewall 71a includes inclined surfaces 711a and 711b, a contact surface 712, and connecting surfaces 713a and 713b.

[0052] Inclined surfaces 711a and 711b are a pair of inclined surfaces facing each other in the third direction D3. The dimension of the inclined surfaces 711a and 711b in the first direction D1 is greater than or equal to the dimension of the winding 61 in the first direction D1. In this embodiment, as... Figure 9 As shown, inclined surfaces 711a and 711b exist throughout the entire first region 70a. Figure 3 As shown, inclined surfaces 711a and 711b are located on both sides of the inner surface 710 in the third direction D3. Inclined surfaces 711a and 711b overlap with the core 8, making them closer to the core 8 in the third direction D3 than the winding 61. That is, in the third direction D3, the distance between inclined surfaces 711a and 711b and the surfaces in the core 8 opposite to inclined surfaces 711a and 711b is shorter than the distance between the surfaces on the inclined surfaces 711a and 711b side in the winding 61 and the core 8. Figure 3 In the middle, inclined surfaces 711a and 711b are respectively opposite to the corners 81a and 81b of the core 8 in the third direction D3. Therefore, in Figure 3 In the context of inclined surfaces 711a and 711b and core 8, the distance between the surfaces opposite to inclined surfaces 711a and 711b is the distance between the corners 81a and 81b of inclined surfaces 711a and 711b and core 8. Figure 3 In this embodiment, the distance between the inclined surfaces 711a and 711b of the winding 61 and the core 8 is the distance between the side surfaces 83a and 83b of the winding 61 and the core 8. In this embodiment, the core 8 sometimes moves in the third direction. The amount of change in the distance between the inclined surfaces 711a and 711b and the surface of the core 8 opposite to the inclined surfaces 711a and 711b, and the amount of change in the distance between the inclined surfaces 711a and 711b of the winding 61 and the core 8 caused by the movement of the core 8 in the third direction D3 is the same. Therefore, regardless of the position of the core 8 in the third direction D3, the relationship that the inclined surfaces 711a and 711b are closer to the core 8 than the winding 61 in the third direction D3 holds true.

[0053] Like this, in Figure 3In this configuration, inclined surfaces 711a and 711b overlap with the core 8, making them closer to the core 8 than the winding 61 in the third direction D3. Therefore, when the core 8 is close to the inclined surface 711, it is not the winding 61 but the inclined surface 711 that collides with the core 8, thus preventing contact between the core 8 and the winding 61. This prevents breakage of the winding 61 caused by contact between the core 8 and the winding 61.

[0054] The inclined surfaces 711a and 711b are inclined such that the side closer to the core 8 in the second direction D2 is farther away from the core 8 in the third direction D3. Figure 4 In the middle, inclined surfaces 711a and 711b are planes with an angle of 45 degrees relative to the third direction D3.

[0055] The contact surface 712 is located between inclined surfaces 711a and 711b in the third direction D3. The contact surface 712 contacts the core 8 in the second direction D2. Specifically, the contact surface 712 of the inner surface 710 of the pair of sidewalls 71a and 71b contacts the two side surfaces 82a and 82b of the core 8 in the second direction D2, respectively. Furthermore, in Figure 3 as well as Figure 4 The image shows a state where the contact surface 712 is not in contact with the side surface 82 of the core 8 in the second direction D2, but as shown... Figure 10 As shown, the contact surface 712 contacts the two side surfaces 82a and 82b of the core 8 in the second direction D2. The contact surface 712 has a surface shape that allows the core 8 to move in the third direction D3. That is, it allows the core 8 to move along the third direction D3 while in contact with a pair of sidewalls 71a and 71b. In this embodiment, the dimension of the contact surface 712 in the third direction D3 is larger than the dimension of the side surface 83 of the core 8 in the third direction D3. The contact surface 712 is planar.

[0056] Connecting surfaces 713a and 713b connect the contact surface 712 and the inclined surfaces 711a and 711b, respectively. Connecting surfaces 713a and 713b are located within the inner surface 710 between the inclined surfaces 711a and 711b and the contact surface 712. The angle of connecting surfaces 713a and 713b relative to the third direction D3 is larger than the angle of inclined surfaces 711a and 711b relative to the third direction D3. Figure 4In this design, the connecting surfaces 713a and 713b are planar, with an angle of 90 degrees relative to the third direction D3. The connecting surfaces 713a and 713b are provided to ensure stable contact between the core 8 and the inclined surfaces 711a and 711b. For example, without the connecting surface 713a and with the inclined surface 711a continuous with the contact surface 712, the core 8 might get stuck at the boundary between the inclined surface 711a and the contact surface 712. This is because, in actual products, there are shape errors, so at the boundary between the inclined surface 711a and the contact surface 712, the angle between the inclined surface 711a and the contact surface 712 becomes smaller than the set angle, or becomes an unexpected shape. By having the connecting surface 713a, the possibility of the core 8 getting stuck at the boundary between the inclined surface 711a and the contact surface 712 can be eliminated, ensuring stable contact between the core 8 and the inclined surfaces 711a and 711b.

[0057] The inner surfaces 710 of the pair of sidewalls 71a and 71b of the winding tube 7 are configured as described above. The operation of the inner surfaces 710 of the pair of sidewalls 71a and 71b in reducing the impact transmitted from the winding tube 7 to the core 8 will be explained in detail in "[3. Operation when an impact is applied to the housing]" later.

[0058] The first end 72 is rectangular. The first end 72 connects the second end of a pair of sidewalls 71a and 71b. Figure 7 as well as Figure 8 The left ends of the two sidewalls 71a and 71b are connected to each other. The second end 73 is rectangular. The first end of the pair of sidewalls 71a and 71b is connected to each other. Figure 7 as well as Figure 8 (The right ends) are connected to each other.

[0059] The retaining plate 74 is used to retain the capacitor C1. The retaining plate 74 is rectangular. The retaining plate 74 is configured in a third region 70c of a pair of sidewalls 71a, 71b to connect the pair of sidewalls 71a, 71b to each other.

[0060] The spool portion 75 is used to hold the winding 63 that constitutes the third inductor. The spool portion 75 is cuboid in shape. The spool portion 75 protrudes from the first end portion 72. In particular, the spool portion 75 protrudes from the first end portion 72 in a direction orthogonal to the length direction of the pair of sidewalls 71a, 71b (second direction D2).

[0061] like Figure 7 as well as Figure 8 As shown, a pair of protrusions 76 protrude from the portions of the pair of sidewalls 71a and 71b not surrounded by the winding 61 in the third direction D3. The pair of protrusions 76 protrude from the first end of the pair of sidewalls 71a and 71b in the third direction D3 (…). Figure 8 The upper end protrudes. A pair of protrusions 76 are not physically directly connected to each other. Therefore, as... Figure 5As shown, the winding tube 7 has an opening 761 between a pair of protrusions 76. (As indicated...) Figure 2 as well as Figure 5 As shown, the protrusion amount of a pair of protrusions 76 is set such that the pair of protrusions 76 do not collide with the housing 3. That is, the pair of protrusions 76 do not directly contact the housing 3. The elastic member 4 is located between the pair of protrusions 76 and the housing 3.

[0062] like Figure 7 as well as Figure 8 As shown, a pair of protrusions 77 protrude from the portions of the pair of sidewalls 71a and 71b not surrounded by the winding 61 in the third direction D3. The pair of protrusions 77 protrude from the third end of the pair of sidewalls 71a and 71b in the third direction D3 ( Figure 8 The lower end protrudes. A pair of protrusions 77 are not physically directly connected to each other. Therefore, as... Figure 5 As shown, the winding tube 7 has an opening 771 between a pair of protrusions 77. (As indicated...) Figure 2 as well as Figure 5 As shown, the protrusion amount of a pair of protrusions 77 is set so that the pair of protrusions 77 do not collide with the housing 3. That is, the pair of protrusions 77 do not directly contact the housing 3. The elastic member 4 is located between the pair of protrusions 77 and the housing 3.

[0063] The first to fourth connecting members 91 to 94 are formed of conductive materials such as metals.

[0064] like Figure 7 as well as Figure 8 As shown, the first and second connecting members 91 and 92 respectively have connecting terminals 911 and 921 and winding terminals 912 and 922. Connecting terminals 911 and 921 are rod-shaped. Connecting terminals 911 and 921 protrude from the first end 72. Specifically, connecting terminals 911 and 921 protrude at the first end 72 in a direction opposite to the pair of sidewalls 71a and 71b. Connecting terminals 911 and 921 are used to electrically connect the antenna device 1 to an external drive circuit. Winding terminals 912 and 922 protrude from the first end 72. Winding terminals 912 and 922 protrude from the first end 72 in a direction orthogonal to the length direction of the pair of sidewalls 71a and 71b (second direction D2). The directions in which winding terminals 912 and 922 protrude are opposite to each other.

[0065] like Figure 7 as well as Figure 8 As shown, the third and fourth connecting members 93 and 94 respectively have winding terminals 931 and 941 and connecting terminals 932 and 942. The third and fourth connecting members 93 and 94 are fixed to the retaining plate 74. In particular, the third and fourth connecting members 93 and 94 are fixed to the retaining plate 74 on the side opposite to the pair of sidewalls 71a and 71b.

[0066] like Figure 7 as well as Figure 8 As shown, the winding 61 is composed of a conductor W1. More specifically, the conductor W1 is wound around a first region 70a of a pair of sidewalls 71a and 71b of the winding tube 7, such that the axial direction of the winding 61 is aligned with the longitudinal direction (first direction D1) of the pair of sidewalls 71a and 71b. The portion of the conductor W1 wound around the first region 70a constitutes the winding 61. In this way, the winding 61 is wound around the winding tube 7 such that it completely surrounds the pair of sidewalls 71a and 71b with the first direction D1 as the axial direction. The number of turns of the winding 61 is, for example, 100. The two ends of the conductor W1 are respectively fixed to the winding terminal 922 of the second connecting member 92 and the winding terminal 941 of the fourth connecting member 94, and are electrically connected. The two ends of the conductor W1 are, for example, bound to the winding terminals 922 and 941 respectively.

[0067] like Figure 7 as well as Figure 8 As shown, the winding 62 is composed of a conductor W2. More specifically, the conductor W2 is wound around a second region 70b of a pair of sidewalls 71a, 71b of the winding tube 7, such that the axial direction of the winding 62 is aligned with the longitudinal direction (first direction D1) of the pair of sidewalls 71a, 71b. The portion of the conductor W2 wound around the second region 70b constitutes the winding 62.

[0068] like Figure 7 as well as Figure 8 As shown, the winding 63 is composed of a conductor W2. More specifically, the conductor W2 is wound around a spool 75 of the winding tube 7. The portion of the conductor W2 wound around the spool 75 constitutes the winding 63. The spool 75 protrudes from the first end 72 in the second direction D2, so the axial direction of the winding 63 is orthogonal to the first direction D1.

[0069] Windings 62 and 63 are formed by the same conductor W2, and are therefore electrically connected in series. Figure 7 As shown, the two ends of the wire W2 are fixed to the winding terminal 912 of the first connecting member 91 and the winding terminal 931 of the third connecting member 93, respectively, and are electrically connected. The two ends of the wire W2 are, for example, bound to the winding terminals 912 and 931 respectively.

[0070] Capacitor C1 is held by holding plate 74. In particular, capacitor C1 is held by the third and fourth connecting members 93 and 94 on holding plate 74. The two ends of capacitor C1 are fixed to and electrically connected to the connecting terminals 932 and 942 of the third and fourth connecting members 93 and 94, respectively. In this way, capacitor C1 is electrically connected in series with the first inductor.

[0071] like Figure 1 as well as Figure 2 As shown, housing 3 accommodates antenna body 2. Figure 2 As shown, the housing 3 is a cylindrical shape extending in the first direction D1. For example, the housing 3 is a square cylindrical shape extending in the first direction D1. The first end 31a of the housing 3 in the first direction D1 is open, and the second end 31b of the housing 3 in the first direction D1 is closed. The antenna body 2 is inserted into the housing 3 from the first end 31a. Figure 3 as well as Figure 6 As shown, the housing 3 has two side walls 32a and 32b in the second direction D2. The side walls 32a and 32b are opposite to a pair of side walls 71a and 71b, respectively. The side walls 32a and 32b are parallel to each other. The housing 3 also has two side walls 33a and 33b in the third direction D3. The side walls 33a and 33b are parallel to each other. The housing 3 is formed, for example, of a resin material that is an insulating, non-magnetic material.

[0072] The elastic member 4 is provided to reduce the impact transmitted from the housing 3 to the winding tube 7. For example... Figure 2 as well as Figure 6 As shown, the elastic member 4 includes a first portion 41, a second portion 42, and a connecting portion 43. The first portion 41 is located between the antenna body 2 and the side wall portion 33a of the housing 3. The second portion 42 is located between the antenna body 2 and the side wall portion 33b of the housing 3. Therefore, the elastic member 4 reduces the impact in the third direction D3. The connecting portion 43 connects the first portion 41 and the second portion 42 into a continuous unit. The connecting portion 43 is located between the antenna body 2 and the second end 31b of the housing 3. The elastic member 4 is formed, for example, from sponge, rubber, etc.

[0073] Connector 5 is used to mechanically connect antenna device 1 to an external drive circuit. For example... Figure 2 as well as Figure 6 As shown, the connector 5 includes a fixing part 51 and a cylindrical part 52. The fixing part 51 is used to attach the connector 5 to the first end 72 of the winding tube 7 of the antenna body 2. The cylindrical part 52 completely surrounds the connection terminals 911 and 921 of the first and second connecting members 91 and 92 of the antenna body 2. The connector 5 is fixed to the housing 3 such that the first end 31a of the housing 3 is closed. The connector 5 is formed, for example, of a resin material with insulating properties.

[0074] Next, the circuit of the antenna device 1 described above will be explained. The antenna device 1 includes a first inductor (winding 61 and core 8), a second inductor (winding 62 and core 8), a third inductor (winding 63), and a capacitor C1. In the antenna device 1, the capacitor C1 is electrically connected in series with the first inductor. The first inductor and the capacitor C1 form a series resonant circuit. The second and third inductors are electrically connected in series with the series resonant circuit. The third inductor is electrically connected in series with the second inductor. The second and third inductors are used as a resistive circuit for adjusting the resistance value of the antenna device 1. By adjusting the resistance value of the resistive circuit, the magnitude of the current at a specific frequency can be adjusted, and the Q value can be adjusted. The specific frequency is, for example, the resonant frequency of the series resonant circuit of the first inductor and the capacitor C1.

[0075] [3. Actions when an impact is applied to the casing]

[0076] As described above, in this embodiment, the inner surfaces 710 of the pair of sidewalls 71a and 71b of the winding tube 7 are configured to reduce the impact transmitted from the winding tube 7 to the core 8. Hereinafter, the operation of the inner surfaces 710 of the pair of sidewalls 71a and 71b in reducing the impact transmitted from the winding tube 7 to the core 8 will be described with reference to... Figure 10 Please provide an explanation. Additionally... Figure 10 The up and down directions correspond to the third direction, D3. Figure 10 The downward orientation D31 is the orientation along the third direction D3.

[0077] exist Figure 10 In the initial state shown at the top, the two side surfaces 82a and 82b of the core 8 are in contact with the contact surfaces 712 of the inner surfaces 710 of the pair of sidewalls 71a and 71b of the winding tube 7. In the initial state, the corners 81a to 81d of the core 8 are not in contact with the inclined surfaces 711a to 711d of the pair of sidewalls 71a and 71b of the winding tube 7.

[0078] In the initial state, an application was made to the housing 3. Figure 10 When the downward-facing impact of the object is applied to D31, the impact is transmitted from the housing 3 to the winding tube 7, and the winding tube 7 and the housing 3 together... Figure 10 The lower direction moves upwards towards D31. The contact surface 712 of the winding tube 7 has a surface shape that allows the core 8 to move in the third direction D3, therefore, as... Figure 10 As shown in the second one from the top, the winding tube 7 is relative to the core 8. Figure 10 The lower direction moves upward towards D31. The winding tube 7 moves relative to the core 8, thereby reducing the impact transmitted from the winding tube 7 to the core 8.

[0079] Furthermore, the winding tube 7 relative to the core 8 is in Figure 10When the core moves downwards towards D31, the inclined surface 711 overlaps with the core 8, making it closer to the core 8 in the third direction D3 than the winding 61. Therefore, the corners 81a and 81c of the core 8 do not collide with the winding 61 but instead contact the inclined surfaces 711a and 711c of the pair of sidewalls 71a and 71b of the winding tube 7. Thus, although an impact is transmitted from the winding tube 7 to the core 8, the inclined surfaces 711a and 711c are inclined such that the closer they are to the core side in the second direction D2, the further away they are from the core 8 in the third direction D3. Therefore, the impact transmitted from the winding tube 7 to the core 8 is dispersed in both the second and third directions D2. This further reduces the downward impact towards D31 transmitted from the winding tube 7 to the core 8. Furthermore, the contact between the core 8 and the winding 61 is prevented by the inclined surface 711, thus preventing breakage of the winding 61 caused by contact between the core 8 and the winding 61.

[0080] If the corners 81a and 81c of the core 8 contact the inclined surfaces 711a and 711c of a pair of sidewalls 71a and 71b of the winding tube 7, the core 8 receives an impact downward toward D31 from the winding tube 7. The contact surface 712 of the winding tube 7 has a surface shape that allows the core 8 to move in the third direction D3, therefore... Figure 10 As shown in the third one from the top, core 8 is relative to winding tube 7. Figure 10 The lower direction moves upward towards D31. The core 8 moves relative to the winding tube 7, thereby reducing the impact applied to the core 8.

[0081] Furthermore, core 8 relative to winding tube 7 in Figure 10 When the downward direction moves upward to D31, the inclined surface 711 overlaps with the core 8, making it closer to the core 8 in the third direction D3 than the winding 61. Therefore, Figure 10 As shown in the fourth example from the top, the corners 81b and 81d of the core 8 do not collide with the winding 61 but instead contact the inclined surfaces 711b and 711d of the pair of sidewalls 71a and 71b of the winding tube 7. Therefore, although an impact is transmitted from the winding tube 7 to the core 8, the inclination of the inclined surfaces 711b and 711d causes them to be closer to the core side in the second direction D2 and further away from the core 8 in the third direction D3. Thus, the impact transmitted from the winding tube 7 to the core 8 is dispersed in both the second direction D2 and the third direction D3. Therefore, the downward impact transmitted from the winding tube 7 to the core 8 in the direction D31 can be further reduced.

[0082] Furthermore, it is desired that the core 8 relative to the winding tube 7 is in Figure 10 When the downward direction moves upward to D31, the inclined surfaces 711b and 711d of the pair of sidewalls 71a and 71b of the winding tube 7 are pushed by the corners 81b and 81d of the core 8. As described above, the inclined surfaces 711b and 711d are inclined such that the closer they are to the core side in the second direction D2, the further they are from the core 8 in the third direction D3. Therefore, as Figure 10As shown at the bottom, a pair of sidewalls 71a and 71b are pushed by the core 8 so that they move away from each other in the second direction D2, thereby causing the corners 81b and 81d of the core 8 to slide on the inclined surfaces 711b and 711d. In this way, the pair of sidewalls 71a and 71b move in a direction that moves away from each other, thereby reducing the impact applied to the core 8.

[0083] In the antenna device 1 of this embodiment, the impact transmitted from the winding tube 7 to the core 8 can be reduced, and the impact applied to the core 8 can also be reduced. Furthermore, in the antenna device 1, an elastic member 4 is provided between the housing 3 and the antenna body 2, thus further reducing the impact transmitted from the housing 3 to the winding tube 7. Therefore, in the antenna device 1, while reducing the impact transmitted from the housing 3 to the winding tube 7, the impact transmitted from the winding tube 7 to the core 8 can also be reduced.

[0084] [4. Effects, etc.]

[0085] As described above, the antenna device 1 includes an antenna body 2 and a housing 3 that houses the antenna body 2. The antenna body 2 has a winding tube 7, a winding 61, and a core 8. The winding tube 7 has a pair of sidewalls 71a and 71b. The pair of sidewalls 71a and 71b extend in a first direction D1 and have inner surfaces 710 facing each other in a second direction D2 that intersects the first direction D1. The winding 61 is wound around the winding tube 7 such that it completely surrounds the pair of sidewalls 71a and 71b about the first direction D1. The core 8 is held by the pair of sidewalls 71a and 71b such that it is located inside the winding 61 between the inner surfaces 710 of the pair of sidewalls 71a and 71b. Both of the inner surfaces 710 of the pair of sidewalls 71a and 71b include inclined surfaces 711. The inclined surface 711 overlaps with the core 8, making it closer to the core 8 than the winding 61 in the third direction D3, which intersects the first direction D1 and the second direction D2. The inclination further away from the core 8 in the third direction D3 than the surface 711 is in the second direction D2. This structure reduces the impact applied to the core 8.

[0086] Furthermore, in antenna device 1, the dimension of the third direction D3 of the pair of sidewalls 71a, 71b is larger than the dimension of the third direction D3 of the core 8. According to this structure, it is possible to suppress the core 8 from protruding from the sidewalls 71a, 71b in the third direction D3, and to suppress contact between the core 8 and the winding 61.

[0087] Furthermore, in the antenna device 1, both of the inner surfaces 710 of the pair of sidewalls 71a and 71b comprise a pair of inclined surfaces 711 facing each other in the third direction D3. According to this structure, it is possible to suppress the protrusion of the core 8 from the sidewalls 71a and 71b in the third direction D3, and to suppress contact between the core 8 and the winding 61.

[0088] Furthermore, in the antenna device 1, both of the inner surfaces 710 of the pair of sidewalls 71a and 71b have contact surfaces 712 that contact the side surface 82 of the core 8 in the second direction D2. According to this structure, the movement of the core 8 in the second direction D2 can be restricted.

[0089] Furthermore, in the antenna device 1, the contact surface 712 has a surface shape that allows the core 8 to move in the third direction D3. According to this structure, the core 8 can move in the second direction D2, thereby avoiding impacts applied to the core 8 and reducing the impacts applied to the core 8.

[0090] Furthermore, in antenna device 1, the dimension of the third direction D3 of contact surface 712 is larger than the dimension of the third direction D3 of side surface 82 of core 8. According to this structure, core 8 can move in the second direction D2 to avoid impacts applied to core 8, thereby reducing the impact applied to core 8.

[0091] Furthermore, in the antenna device 1, at least one of the inner surfaces 710 of a pair of sidewalls 71a and 71b has a connecting surface 713 that connects the contact surface 712 and the inclined surface 711. The angle of the connecting surface 713 relative to the third direction D3 is larger than the angle of the inclined surface 711 relative to the third direction D3. According to this structure, the inclined surface 711 and the core 8 can make stable contact. In the above embodiment, the angle of the connecting surface 713 relative to the third direction D3 is 90 degrees, and the angle of the inclined surface 711 relative to the third direction D3 is 45 degrees.

[0092] Furthermore, in the antenna device 1, the core 8 has a corner portion 81 opposite the inclined surface 711 in the third direction D3. The corner portion 81 is conical in shape. According to this structure, the inclined surface 711 and the core 8 can be stably contacted. Alternatively, the corner portion 81 can also be R-shaped.

[0093] Furthermore, in the antenna device 1, the winding tube 7 has a pair of protrusions 76 that protrude in a third direction D3 from the portions of the pair of sidewalls 71a and 71b that are not surrounded by the winding 61. The pair of protrusions 76 do not directly contact the housing 3. According to this structure, the impact transmitted from the housing 3 to the winding tube 7 can be reduced, and the impact applied to the core 8 can be reduced. Furthermore, in the antenna device 1, the winding tube 7 has a pair of protrusions 77 that protrude in a third direction D3 from the portions of the pair of sidewalls 71a and 71b that are not surrounded by the winding 61. The pair of protrusions 77 do not directly contact the housing 3. According to this structure, the impact transmitted from the housing 3 to the winding tube 7 can be reduced, and the impact applied to the core 8 can be reduced.

[0094] Furthermore, in the antenna assembly 1, the winding tube 7 has an opening 761 between a pair of protrusions 76. According to this structure, impacts from the housing 3 are no longer applied to the central portion of the core 8, thus reducing the possibility of core 8 breakage. Furthermore, in the antenna assembly 1, the winding tube 7 has an opening 771 between a pair of protrusions 77. According to this structure, impacts from the housing 3 are no longer applied to the central portion of the core 8, thus reducing the possibility of core 8 breakage.

[0095] Furthermore, in antenna device 1, core 8 is a rod-shaped extension in the first direction D1, and the dimension of core 8 in the third direction D3 is smaller than the dimension of core 8 in the second direction D2. This structure reduces the impact on core 8 in the third direction D3, where its strength becomes relatively weak, thereby reducing the possibility of core 8 breakage.

[0096] Furthermore, in antenna device 1, the angle between the tilting surface 711 and the third direction D3 is greater than 0 degrees and less than 45 degrees. According to this structure, the force applied to the core 8 due to impact can be dispersed, making the force in the third direction D3 less than or equal to the force in the second direction D2. Therefore, the impact applied to the core 8 can be reduced. In the above embodiment, the angle between the tilting surface 711 and the third direction D3 is 45 degrees.

[0097] Furthermore, in the antenna device 1, the dimension of the first direction D1 of the tilted surface 711 is greater than or equal to the dimension of the first direction D1 of the winding 61. According to this structure, contact between the core 8 and the winding 61 can be suppressed by the tilted surface 711.

[0098] Furthermore, the antenna device 1 also includes an elastic member 4 located between the antenna body 2 and the housing 3 in the third direction D3. This structure reduces the impact transmitted from the housing 3 to the winding tube 7 and reduces the impact applied to the core 8.

[0099] (Modified Example)

[0100] The embodiments disclosed herein are not limited to the embodiments described above. Various modifications can be made to the above embodiments based on design, etc., as long as the purpose of this disclosure is achieved. Hereinafter, variations of the above embodiments are listed. The variations described below can be appropriately combined and applied.

[0101] [1. Variation Example 1]

[0102] Figure 11 This is a partial perspective view of the antenna body 2 of the antenna device 1 in Modified Example 1. Figure 12 yes Figure 11 A DD-line sectional view. For example... Figure 11 as well as Figure 12As shown, the winding tube 7 has connecting portions 78a and 78b (hereinafter referred to as 78 for general purposes). Connecting portions 78a and 78b are connected to each other at the portions outside the pair of sidewalls 71a and 71b that are not surrounded by the winding 61. Connecting portion 78a is located at the first end of the third direction D3 of the pair of sidewalls 71a and 71b. Figure 12 The upper end of the winding tube 7 is located on the connecting parts 78a and 78b. The positioning of the pair of sidewalls 71a and 71b and the overall strength of the winding tube 7 can be improved through the connecting parts 78a and 78b. The connecting part 78b is located at the second end of the third direction D3 of the pair of sidewalls 71a and 71b. Figure 12 The connecting portion 78 has a central portion 781 and two end portions 782 in the second direction D2. The surface of the connecting portion 78 opposite to the core 8 is a surface shape in which the two end portions 782 protrude more than the central portion 781. That is, in the connecting portion 78, it is easier for the two end portions 782 to collide with the housing 3 than for the central portion 781. Therefore, the central portion 781 of the connecting portion 78 becomes less likely to contact the core 8. According to Modification 1, the impact from the housing 3 is no longer applied to the central portion of the core 8, thus reducing the possibility of core 8 breakage.

[0103] [2. Variation Example 2]

[0104] Figure 13 This is a partial perspective view of the antenna body 2 of the antenna device 1 in Modified Example 2. Figure 14 yes Figure 13 A sectional view along the EE line. (e.g.) Figure 13 as well as Figure 14 As shown, the winding tube 7 has connecting portions 79a and 79b (hereinafter referred to as 79 for general purposes). Connecting portions 79a and 79b are connected to each other at the portions of the outer sides 71a and 71b not surrounded by the winding 61. Connecting portion 79a is located at the first end of the third direction D3 of the pair of side walls 71a and 71b. Figure 14 The upper end) side. The connecting part 79b is located at the second end of the third direction D3 of the pair of sidewalls 71a and 71b. Figure 12 (Lower end) side. The connection portions 79a and 79b can be used to position the pair of sidewalls 71a and 71b and improve the overall strength of the winding tube 7. The connection portion 79 has a central portion 791 and two end portions 792 in the first direction D1. The surface of the connection portion 79 opposite to the core 8 is a surface shape in which the two end portions 792 protrude more than the central portion 791. That is, in the connection portion 79, it is easier for the two end portions 792 to collide with the housing 3 than the central portion 791. Therefore, even when the connection portion 79 is in contact with the core 8, the range of force applied to the core 8 in the first direction D1 can be widened. According to the modified example 2, the impact from the housing 3 becomes less likely to concentrate at a single point in the first direction D1 of the core 8, thus reducing the possibility of core 8 breakage.

[0105] [3. Variation Example 3]

[0106] Figure 15 This is a cross-sectional view of antenna device 1 in variant example 3. Figure 15 In the winding tube 7, a pair of sidewalls 71a and 71b each have openings 714a and 714b. More specifically, sidewall 71a includes a pair of wall portions 71a1 and 71a2 facing each other in the third direction D3. The space between the pair of wall portions 71a1 and 71a2 forms the opening 714a. The inner surfaces 710 of the wall portions 71a1 and 71a2 each include inclined surfaces 711a and 711b. Sidewall 71b includes a pair of wall portions 71b1 and 71b2 facing each other in the third direction D3. The space between the pair of wall portions 71b1 and 71b2 forms the opening 714b. The inner surfaces 710 of the wall portions 71b1 and 71b2 each include inclined surfaces 711c and 711d. In this way, the sidewalls 71a and 71b of the winding tube 7 may each be not a single component but include multiple components.

[0107] [4. Other variations]

[0108] In the above embodiment, both of the inner surfaces 710 of the pair of sidewalls 71a and 71b include inclined surfaces 711. In a variation, only one of the inner surfaces 710 of the pair of sidewalls 71a and 71b may include an inclined surface 711. In short, it is sufficient that at least one of the inner surfaces 710 of the pair of sidewalls 71a and 71b includes an inclined surface 711.

[0109] In a variation, the angle of the inclined surface 711 relative to the third direction D3 may be less than 45 degrees and not greater than 0 degrees. In the above embodiment, the inclined surface 711 is a plane with a fixed inclination, but it is not limited to this and may also be composed of curved surfaces and multiple surfaces with different inclinations. In short, the inclined surface 711 can be any shape that can transform a portion of the third direction D3 component of the impact applied to the core 8 into a component of the second direction D2.

[0110] In a modified example, the dimension of the third direction D3 of the pair of sidewalls 71a, 71b may not necessarily be greater than the dimension of the third direction D3 of the core 8.

[0111] In the above embodiment, both of the inner surfaces 710 of the pair of sidewalls 71a and 71b are comprised of a pair of opposing inclined surfaces 711 in the third direction D3. In a variation, only one of the inner surfaces 710 of the pair of sidewalls 71a and 71b may be comprised of a pair of opposing inclined surfaces 711 in the third direction D3. In short, it is sufficient that at least one of the inner surfaces 710 of the pair of sidewalls 71a and 71b is comprised of a pair of opposing inclined surfaces 711 in the third direction D3.

[0112] In the above embodiment, both of the inner surfaces 710 of the pair of sidewalls 71a and 71b have a contact surface 712. In a variation, only one of the inner surfaces 710 of the pair of sidewalls 71a and 71b may have a contact surface 712. In short, it is sufficient that at least one of the inner surfaces 710 of the pair of sidewalls 71a and 71b has a contact surface 712.

[0113] In one variation, the contact surface 712 is not limited to a plane, but can also be a surface with multiple protrusions having flat tops. In short, the contact surface 712 can be any surface shape that allows the core 8 to move in the third direction D3. On the other hand, the contact surface 712 may not be a surface shape that allows the core 8 to move in the third direction D3. In one variation, the dimension of the contact surface 712 in the third direction D3 may not be greater than the dimension of the side surface 82 of the core 8 in the third direction D3.

[0114] In a variation, only one of the inner surfaces 710 of the pair of sidewalls 71a and 71b may have a connecting surface 713. In short, it is sufficient that at least one of the inner surfaces 710 of the pair of sidewalls 71a and 71b has a connecting surface 713. The angle of the connecting surface 713 relative to the third direction D3 may also be no greater than the angle of the inclined surface 711 relative to the third direction D3.

[0115] In one variation, the corner 81 of the core 8 may not be conical or R-shaped, but rather a right-angled shape. In another variation, the core 8 may not be a rod extending in the first direction D1. In yet another variation, the dimension of the core 8 in the third direction D3 may not be less than the dimension of the core 8 in the second direction D2.

[0116] In one variation, the winding tube 7 may also lack a pair of protrusions 76 and a pair of protrusions 77. In another variation, the winding tube 7 may also lack openings 761 and 771.

[0117] In one variation, the dimension of the first direction D1 of the inclined surface 711 may not be greater than the dimension of the first direction D1 of the winding 61. In another variation, multiple inclined surfaces 711 may be provided along the first direction D1.

[0118] In one variation, the antenna device 1 may also omit the elastic member 4. In another variation, the antenna device 1 may also omit the connector 5.

[0119] In the above embodiment, the antenna device 1 is a series resonant circuit including a first inductor and a capacitor C1, but it is not limited to this. The antenna device 1 may also be a parallel resonant circuit, for example. Furthermore, the antenna device 1 may have a conventionally known circuit structure, and may include other circuit elements besides the first inductor and the capacitor C1, or may not include the capacitor C1. The antenna device 1 may also not necessarily include windings 62 and 63.

[0120] (Way)

[0121] As can be understood from the above embodiments and variations, this disclosure includes the following methods. Hereinafter, reference numerals are enclosed in brackets only to illustrate the correspondence with the embodiments.

[0122] The first embodiment is an antenna device (1) comprising an antenna body (2) and a housing (3) for accommodating the antenna body (2). The antenna body (2) has a winding tube (7), a winding (61), and a core (8). The winding tube (7) has a pair of sidewalls (71a, 71b). The pair of sidewalls (71a, 71b) extend in a first direction (D1) and have inner surfaces (710) opposing each other in a second direction (D2) intersecting the first direction (D1). The winding (61) is wound around the winding tube (7) such that it completely surrounds the pair of sidewalls (71a, 71b) about the first direction (D1). The core (8) is held by the pair of sidewalls (71a, 71b) such that it is located inside the winding (61) between the inner surfaces (710) of the pair of sidewalls (71a, 71b). At least one of the inner surfaces (710) of the pair of sidewalls (71a, 71b) includes an inclined surface (711). The inclined surface (711) overlaps with the core (8) such that it is closer to the core (8) than the winding (61) in a third direction (D3) intersecting the first direction (D1) and the second direction (D2), and is inclined such that the closer it is to the core in the second direction (D2), the further away it is from the core (8) in the third direction (D3). In this way, the impact applied to the core (8) can be reduced.

[0123] The second method is an antenna device (1) based on the first method. In the second method, the dimension of the third direction (D3) of the pair of sidewalls (71a, 71b) is larger than the dimension of the core (8) in the third direction (D3). According to this method, it is possible to suppress the protrusion of the core (8) from the sidewalls (71a, 71b) in the third direction (D3) and to suppress contact between the core (8) and the winding (61).

[0124] The third approach is an antenna device (1) based on the first or second approach. In the third approach, at least one of the inner surfaces (710) of the pair of sidewalls (71a, 71b) includes a pair of inclined surfaces (711) facing each other in the third direction (D3). According to this approach, it is possible to suppress the protrusion of the core (8) from the sidewalls (71a, 71b) in the third direction (D3) and to suppress contact between the core (8) and the winding (61).

[0125] The fourth approach is an antenna device (1) based on any one of the first to third approaches. In the fourth approach, at least one of the inner surfaces (710) of the pair of sidewalls (71a, 71b) has a contact surface (712) that contacts the side surface (82) of the core (8) in the second direction (D2). According to this approach, the movement of the core (8) in the second direction (D2) can be restricted.

[0126] The fifth method is an antenna device (1) based on the fourth method. In the fifth method, the contact surface (712) has a surface shape that allows the core (8) to move in the third direction (D3). According to this method, the core (8) can move in the second direction (D2) to avoid impacts applied to the core (8) and reduce the impact applied to the core (8).

[0127] The sixth method is an antenna device (1) based on the fifth method. In the sixth method, the dimension of the third direction (D3) of the contact surface (712) is larger than the dimension of the third direction (D3) of the side surface (82) of the core (8). According to this method, the core (8) can move in the second direction (D2) to avoid impacts applied to the core (8) and reduce the impact applied to the core (8).

[0128] The seventh method is an antenna device (1) based on any one of the fourth to sixth methods. In the seventh method, at least one of the inner surfaces (710) of the pair of sidewalls (71a, 71b) has a connecting surface (713) that connects the contact surface (712) and the inclined surface (711). The angle of the connecting surface (713) relative to the third direction (D3) is larger than the angle of the inclined surface (711) relative to the third direction (D3). According to this method, the inclined surface (711) and the core (8) can be stably contacted.

[0129] The eighth method is an antenna device (1) based on any one of the first to seventh methods. In the eighth method, the core (8) has a corner (81) opposite the inclined surface (711) in the third direction (D3). The corner (81) is conical or R-shaped. According to this method, the inclined surface (711) and the core (8) can be in stable contact.

[0130] The ninth method is an antenna device (1) based on any one of the methods 1 to 8. In the ninth method, the winding tube (7) has a pair of protrusions (76; 77) that protrude from the portions of the pair of sidewalls (71a, 71b) not surrounded by the winding (61) in the third direction (D3). The pair of protrusions (76; 77) do not directly contact the housing (3). According to this method, the impact transmitted from the housing (3) to the winding tube (7) can be reduced, and the impact applied to the core (8) can be reduced.

[0131] The tenth method is an antenna device (1) based on the ninth method. In the tenth method, the winding tube (7) has an opening (761; 771) between the pair of protrusions (76; 77). According to this method, the impact from the housing (3) is no longer applied to the central part of the core (8), thus reducing the possibility of core (8) breakage.

[0132] The 11th embodiment is an antenna device (1) based on any one of the 1st to 10th embodiments. In the 11th embodiment, the winding tube (7) has a connecting portion (78) that connects the portions of the outer sides (71a, 71b) not surrounded by the winding (61) to each other. The surface of the connecting portion (78) opposite to the core (8) is a surface shape in which the two ends (782) protrude from the central portion (781). According to this embodiment, the impact from the housing (3) is no longer applied to the central portion of the core (8), thus reducing the possibility of core (8) breakage.

[0133] The 12th method is an antenna device (1) based on any one of the 1st to 11th methods. In the 12th method, the core (8) is a rod-shaped extension in the first direction (D1), and the dimension of the core (8) in the third direction (D3) is smaller than the dimension of the core (8) in the second direction (D2). According to this method, the impact in the third direction (D3) where the strength of the core (8) becomes relatively weak can be reduced, and the possibility of core (8) breakage can be reduced.

[0134] The 13th method is an antenna device (1) based on the 12th method. In the 13th method, the angle between the tilted surface (711) and the third direction (D3) is greater than 0 degrees and less than 45 degrees. According to this method, the force applied to the core (8) due to impact can be dispersed, so that the force in the third direction (D3) becomes less than or equal to the force in the second direction (D2). Therefore, the impact applied to the core (8) can be reduced.

[0135] The 14th method is an antenna device (1) based on any one of the 1st to 13th methods. In the 14th method, the dimension of the first direction (D1) of the inclined surface (711) is greater than or equal to the dimension of the first direction (D1) of the winding (61). According to this method, contact between the core (8) and the winding (61) can be suppressed by the inclined surface (711).

[0136] The 15th embodiment is an antenna device (1) based on any one of the 1st to 14th embodiments. In the 15th embodiment, the antenna device (1) further includes an elastic member (4) located between the antenna body (2) and the housing (3) in the third direction (D3). According to this embodiment, the impact transmitted from the housing (3) to the winding tube (7) can be reduced, and the impact applied to the core (8) can be reduced.

[0137] As described above, embodiments have been presented as examples of the technology in this disclosure. For this purpose, accompanying drawings and detailed descriptions have been provided. Therefore, the constituent elements described in the drawings and detailed descriptions include not only those essential to solving the problem, but also those not essential for illustrating the technology. Therefore, one should not conclude that these non-essential constituent elements are necessary simply because they are described in the drawings and detailed descriptions. Furthermore, the above embodiments are for illustrating the technology in this disclosure, and various modifications, substitutions, additions, omissions, etc., can be made within the scope of the claims or their equivalents.

[0138] Industrial availability

[0139] This disclosure can be applied to antenna devices. Specifically, this disclosure can be applied to antenna devices having a core held inside a winding by a coil.

[0140] Explanation of reference numerals in the attached figures

[0141] 1. Antenna device;

[0142] 2 antenna bodies;

[0143] 3. Shell;

[0144] 4. Elastic components;

[0145] 61 windings;

[0146] 7. Winding tube;

[0147] 71a and 71b sidewalls;

[0148] 710 inner surface;

[0149] 711 (711a~711d) Inclined surface;

[0150] 712 Contact surface;

[0151] 713 (713a~713d) Connection surface;

[0152] 76. Protrusion;

[0153] 761 Opening;

[0154] 77. Protrusion;

[0155] 771 Opening;

[0156] 78 (78a, 78b) Connecting parts;

[0157] 781 Central Department;

[0158] 782 Both ends;

[0159] 8 cores;

[0160] 81(81a~81b) corner;

[0161] 82 (82a, 82b) Side view;

[0162] D1, Direction 1;

[0163] D2, direction 2;

[0164] D3 3rd direction.

Claims

1. An antenna device comprising: Antenna body; and Housing, which houses the antenna body. The antenna body has: A winding tube having a pair of sidewalls extending in a first direction and having inner surfaces opposing each other in a second direction intersecting the first direction; A winding, wound around the winding tube, such that it completely surrounds the pair of sidewalls about the first direction as the axial direction; and The core is held by the pair of sidewalls such that it lies inside the winding between the inner surfaces of the pair of sidewalls. At least one of the inner surfaces of the pair of sidewalls includes an inclined surface. The inclined surface overlaps with the core such that in a third direction intersecting the first and second directions, the inclined surface is closer to the core than the winding, and is inclined such that the closer the inclined surface is to the core side in the second direction, the further away it is from the core in the third direction.

2. The antenna device according to claim 1, wherein, The dimension of the pair of sidewalls in the third direction is larger than the dimension of the core in the third direction.

3. The antenna device according to claim 1 or 2, wherein, At least one of the inner surfaces of the pair of sidewalls comprises a pair of inclined surfaces that are opposite each other in the third direction.

4. The antenna device according to claim 1 or 2, wherein, At least one of the inner surfaces of the pair of sidewalls has a contact surface that contacts the side surface of the core in the second direction.

5. The antenna device according to claim 4, wherein, The contact surface has a surface shape that allows the core to move in the third direction.

6. The antenna device according to claim 5, wherein, The dimension of the contact surface in the third direction is larger than the dimension of the side surface of the core in the third direction.

7. The antenna device according to claim 4, wherein, At least one of the inner surfaces of the pair of sidewalls has a connecting surface that connects the contact surface and the inclined surface. The angle of the connecting surface relative to the third direction is larger than the angle of the inclined surface relative to the third direction.

8. The antenna device according to claim 1 or 2, wherein, The core has an angle portion facing the inclined surface in the third direction. The corner is either conical or R-shaped.

9. The antenna device according to claim 1 or 2, wherein, The winding tube includes: a pair of protrusions that project from the portions of the pair of sidewalls not surrounded by the winding in the third direction. The pair of protrusions do not directly contact the housing.

10. The antenna device according to claim 9, wherein, The winding tube has an opening between the pair of protrusions.

11. The antenna device according to claim 1 or 2, wherein, The winding tube has a connecting portion that connects the portions of the outer sides of the pair of sidewalls that are not surrounded by the winding to each other. The surface of the connecting portion opposite to the core has a shape where both ends protrude beyond the central portion.

12. The antenna device according to claim 1 or 2, wherein, The core is a rod-shaped structure extending in the first direction. The dimension of the core in the third direction is smaller than the dimension of the core in the second direction.

13. The antenna device according to claim 12, wherein, The angle between the inclined surface and the third direction is greater than 0 degrees and less than 45 degrees.

14. The antenna device according to claim 1 or 2, wherein, The dimension of the inclined surface in the first direction is greater than or equal to the dimension of the winding in the first direction.

15. The antenna device according to claim 1 or 2, wherein, It also includes: an elastic member, located in the third direction, between the antenna body and the housing.

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