WO2022137718A1 - アンテナ装置 - Google Patents
アンテナ装置 Download PDFInfo
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- WO2022137718A1 WO2022137718A1 PCT/JP2021/036770 JP2021036770W WO2022137718A1 WO 2022137718 A1 WO2022137718 A1 WO 2022137718A1 JP 2021036770 W JP2021036770 W JP 2021036770W WO 2022137718 A1 WO2022137718 A1 WO 2022137718A1
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- Prior art keywords
- core
- pair
- side walls
- antenna device
- bobbin
- Prior art date
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- 238000004804 winding Methods 0.000 claims abstract description 116
- 230000000717 retained effect Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 description 28
- 230000004048 modification Effects 0.000 description 28
- 239000003990 capacitor Substances 0.000 description 16
- 230000005540 biological transmission Effects 0.000 description 14
- 239000004020 conductor Substances 0.000 description 9
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
- H01Q1/3233—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
- H01Q1/3241—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems particular used in keyless entry systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
- H01Q7/08—Ferrite rod or like elongated core
Definitions
- This disclosure generally relates to an antenna device. More specifically, the present disclosure relates to an antenna device comprising a core held on a bobbin so as to be located inside the winding.
- Patent Document 1 discloses an in-vehicle antenna device as an example of an antenna device.
- the vehicle-mounted antenna device of Patent Document 1 includes an antenna assembly and a case.
- the antenna assembly is integrally composed of a bobbin, a core supported by the bobbin along the longitudinal direction, a coil around the core, a capacitor, and first and second connector connection terminals. There is.
- the present disclosure provides an antenna device capable of reducing the impact applied to the core.
- the antenna body has a bobbin, a winding, and a core.
- the bobbin has a pair of side walls extending in the first direction and having inner surfaces facing each other in the second direction intersecting the first direction.
- the winding is wound around the bobbin so as to comprehensively surround the pair of side walls with the first direction as the axial direction.
- the core is held by the pair of side walls so that it is located 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 the third direction intersecting the first direction and the second direction, and is separated from the core in the third direction toward the core side in the second direction. Tilt.
- the aspect of the present disclosure can reduce the impact on the core.
- FIG. 1 is a cross-sectional view taken along the line AA. BB line sectional view of FIG. Enlarged view of the part shown by P in FIG. Cross-sectional view taken along the line CC of FIG.
- Partial perspective view of the antenna body of the antenna device of the first modification is a sectional view taken along line DD.
- FIG. 13 is a sectional view taken along line EE.
- the positional relationship such as up, down, left, and right shall be based on the positional relationship shown in the drawing.
- Each figure described in the following embodiment is a schematic view, and the ratio of the size and the thickness of each component in each figure does not necessarily reflect the actual dimensional ratio. do not have. Further, the dimensional ratio of each element is not limited to the ratio shown in the drawings.
- FIG. 1 is a perspective view of a configuration example of the antenna device 1 according to the embodiment.
- the antenna device 1 in FIG. 1 is, for example, an in-vehicle antenna device.
- the antenna device 1 is installed on a vehicle door, console, bumper, or the like in order to realize keyless entry, for example.
- FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1
- FIG. 3 is a cross-sectional view taken along the line BB of FIG. 2
- FIG. 4 is an enlarged view of a portion shown by P in FIG. 3
- FIG. 5 is a line CC of FIG. It is a cross-sectional view.
- the antenna device 1 includes an antenna body 2 and a case 3 for accommodating the antenna body 2.
- the antenna body 2 has a bobbin 7, a winding 61, and a core 8.
- the bobbin 7 has a pair of side walls 71a and 71b extending in the first direction D1.
- the pair of side walls 71a, 71b have inner surfaces 710 facing each other in the second direction D2 intersecting the first direction D1.
- the winding 61 is wound around the bobbin 7 so as to comprehensively surround the pair of side walls 71a and 71b with the first direction D1 as the axial direction.
- FIGS. 1 As shown in FIGS.
- the core 8 is held by the pair of side walls 71a, 71b so as to be located inside the winding 61 between the inner surfaces 710 of the pair of side walls 71a, 71b.
- the inner surface 710 of the pair of side walls 71a and 71b includes inclined surfaces 711a to 711d.
- the inclined surfaces 711a to 711d overlap the core 8 so as to be closer to the core 8 than the winding 61 in the third direction D3 intersecting the first direction D1 and the second direction D2, and are on the core 8 side in the second direction D2. As it goes toward it, it inclines away from the core 8 in the third direction D3.
- the core 8 is located inside the winding 61 between the inner surfaces 710 of the pair of side walls 71a and 71b of the bobbin 7.
- this impact is transmitted from the case 3 to the bobbin 7.
- the inclined surfaces 711a to 711d of the bobbin 7 hit the core 8 instead of the winding 61.
- the inclined surfaces 711a to 711d are inclined so as to be toward the core 8 side in the second direction D2 and away from the core 8 in the third direction D3. Therefore, the impact from the bobbin 7 to the core 8 is dispersed in the second direction D2 and the third direction D3, whereby the impact applied to the core 8 can be reduced. Therefore, the possibility of damage to the core 8 can be reduced.
- FIG. 6 is an exploded perspective view of the antenna device 1. As shown in FIG. 6, the antenna device 1 includes an antenna body 2, a case 3, an elastic member 4, and a connector 5.
- FIG. 7 is a plan view of the antenna body 2
- FIG. 8 is a side view of the antenna body 2.
- the antenna body 2 includes windings 61, 62, 63, a bobbin 7, a core 8, and a capacitor C1.
- the winding 61, together with the core 8, constitutes the first inductor.
- the winding 62, together with the core 8, constitutes a second inductor.
- the winding 63 alone constitutes a third inductor.
- the bobbin 7 holds windings 61, 62, 63, a core 8, and a capacitor C1. As shown in FIGS. 7 and 8, the bobbin 7 has an elongated shape.
- the bobbin 7 includes a body 70 and first to fourth connecting members 91 to 94.
- the body 70 is formed of a non-magnetic resin material having an insulating property.
- the first to fourth connecting members 91 to 94 are fixed to the body 70.
- FIG. 9 is a perspective view of the body 70 of the bobbin 7.
- the body 70 includes a pair of side walls 71a and 71b, a first end portion 72, a second end portion 73, a holding plate 74, a winding body portion 75, and a pair of protrusions 76. It is provided with a pair of protrusions 77.
- the pair of side walls 71a and 71b, the first end portion 72, the second end portion 73, the holding plate 74, the winding body portion 75, the pair of protrusions 76, and the pair of protrusions 77 are continuously and integrally formed. Will be done.
- the pair of side walls 71a and 71b form the body of the bobbin 7.
- the pair of side walls 71a and 71b are used to hold the windings 61 and 62, the capacitor C1 and the core 8.
- the pair of side walls 71a and 71b have a long plate shape. As shown in FIG. 9, the pair of side walls 71a and 71b are divided into a first region 70a, a second region 70b and a third region 70c.
- the first region 70a is a region on the first end (right end in FIG. 9) side of the pair of side walls 71a and 71b.
- the first region 70a is used to hold the winding 61 constituting the first inductor.
- the second region 70b is a region on the second end (left end in FIG. 9) side of the pair of side walls 71a and 71b.
- the second region 70b is used to hold the winding 62 constituting the second inductor.
- the third region 70c is a region between the first region 70a and the second region 70b in the pair of side walls 71a and 71b.
- the third region 70c is used for holding the capacitor C1.
- the pair of side walls 71a and 71b have inner surfaces 710 extending in the first direction D1 and facing each other in the second direction D2 intersecting the first direction D1.
- the second direction D2 is orthogonal to the first direction D1.
- the first direction D1 is the length direction of the pair of side walls 71a and 71b.
- the second direction D2 is the thickness direction of the pair of side walls 71a and 71b.
- the pair of side walls 71a and 71b are larger than the core 8.
- the dimension of the third direction D3 of the pair of side walls 71a and 71b is larger than the dimension of the third direction D3 of the core 8.
- the third direction D3 is orthogonal to the first direction D1 and the second direction D2, respectively.
- the third direction D3 is the width direction of the pair of side walls 71a and 71b.
- the core 8 is housed in the space between the pair of side walls 71a and 71b. More specifically, the core 8 is held by the pair of side walls 71a, 71b so as to be located between the inner surfaces 710 of the pair of side walls 71a, 71b.
- the core 8 has a rod shape extending in the first direction D1.
- the core 8 is, for example, a prismatic shape extending in the first direction D1.
- the dimension of the core 8 in the first direction D1 is substantially equal to the dimension of the pair of side walls 71a and 71b in the first direction D1. That is, the core 8 extends over almost the entire length of the pair of side walls 71a and 71b. Therefore, as shown in FIG. 7, the core 8 exists in the first region 70a, the second region 70b, and the third region 70c.
- the core 8 is located inside the winding 61.
- the winding 61, together with the core 8, constitutes the first inductor.
- the core 8 is located inside the winding 62.
- the winding 62, together with the core 8, constitutes a second inductor.
- the core 8 has both side surfaces 82a and 82b (collectively, reference numeral 82) in the second direction D2.
- the side surfaces 82a and 82b face the inner surfaces 710 of the pair of side walls 71a and 71b, respectively.
- the side surfaces 82a and 82b are flat surfaces parallel to each other.
- the core 8 has both side surfaces 83a and 83b (collectively designated by reference numeral 83) in the third direction D3.
- the side surfaces 83a and 83b are flat surfaces parallel to each other.
- the dimension of the third direction D3 of the core 8 is smaller than the dimension of the second direction D2 of the core 8.
- the core 8 has four corner portions 81a to 81d (collectively designated by reference numeral 81) in a plane orthogonal to the first direction D1.
- the corner portion 81 faces the inclined surface 711 of the bobbin 7, which will be described later, in the third direction. That is, the core 8 has a corner portion 81 facing the inclined surface 711 in the third direction D3.
- Each corner 81 has a tapered shape.
- the core 8 is made of ceramics such as ferrite, for example. Ceramics have high heat resistance.
- the inner surfaces 710 of the pair of side walls 71a and 71b are configured to reduce the transmission of impact from the bobbin 7 to the core 8.
- the inner surfaces 710 of such a pair of side walls 71a and 71b will be further described with reference to FIGS. 3 and 4.
- the inner surface 710 of the side wall 71a includes an inclined surface 711a, 711b, a contact surface 712, and a connecting surface 713a, 713b.
- the inner surface 710 of the side wall 71b includes an inclined surface 711c, 711d, a contact surface 712, and a connecting surface 713c, 713d.
- the inclined surfaces 711a, 711b, 711c, and 711d are collectively designated by reference numerals 711.
- the connection surfaces 713a, 713b, 713c, and 713d are collectively designated by reference numeral 713.
- the inner surface 710 of the side wall 71a includes an inclined surface 711a, 711b, a contact surface 712, and a connecting surface 713a, 713b.
- the inclined surfaces 711a and 711b are a pair of inclined surfaces facing each other in the third direction D3.
- the dimension of the inclined surface 711a, 711b in the first direction D1 is equal to or larger than the dimension of the winding 61 in the first direction D1.
- the inclined surfaces 711a and 711b are present over the entire first region 70a.
- the inclined surfaces 711a and 711b are on both sides of the third direction D3 on the inner surface 710.
- the inclined surfaces 711a and 711b overlap the core 8 so as to be closer to the core 8 than the winding 61 in the third direction D3.
- the distance between the inclined surfaces 711a, 711b and the surface of the core 8 facing the inclined surfaces 711a, 711b is the distance between the winding 61 and the surface of the core 8 on the inclined surfaces 711a, 711b side. Shorter than the distance between.
- the inclined surfaces 711a and 711b face the corner portions 81a and 81b of the core 8 in the third direction D3, respectively. Therefore, in FIG. 3, the distance between the inclined surfaces 711a, 711b and the surface of the core 8 facing the inclined surfaces 711a, 711b is the distance between the inclined surfaces 711a, 711b and the corner portions 81a, 81b of the core 8. Is.
- the distance between the winding 61 and the surface of the core 8 on the inclined surface 711a, 711b side is the distance between the winding 61 and the side surfaces 83a, 83b of the core 8.
- the core 8 may move in the third direction.
- the amount of change with the distance to the surface 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 is established.
- the inclined surfaces 711a and 711b overlap the core 8 so as to be closer to the core 8 than the winding 61 in the third direction D3. Therefore, when the core 8 approaches the inclined surface 711, the inclined surface 711 hits the core 8 instead of the winding 61, so that the contact between the core 8 and the winding 61 is prevented. This makes it possible to prevent disconnection of the winding 61 due to contact between the core 8 and the winding 61.
- the inclined surfaces 711a and 711b are inclined so as to be closer to the core 8 side in the second direction D2 and away from the core 8 in the third direction D3.
- the inclined surfaces 711a and 711b are flat surfaces and have an angle of 45 degrees with respect to the third direction D3.
- the contact surface 712 is located between the inclined surfaces 711a and 711b in the third direction D3.
- the contact surface 712 contacts the core 8 in the second direction D2.
- the contact surface 712 of the inner surface 710 of the pair of side walls 71a and 71b comes into contact with both side surfaces 82a and 82b of the second direction D2 of the core 8, respectively.
- FIGS. 3 and 4 show a state in which the contact surface 712 is not in contact with the side surface 82 of the second direction D2 of the core 8, as shown in FIG. 10, the contact surface 712 is the core 8. It comes into contact with both side surfaces 82a and 82b of the second direction D2, respectively.
- the contact surface 712 has a surface shape that allows the core 8 to move in the third direction D3.
- the core 8 is allowed to move along the third direction D3 in a state of being in contact with the pair of side walls 71a and 71b.
- 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 83 of the core 8.
- the contact surface 712 is a flat surface.
- the connecting surfaces 713a and 713b connect the contact surface 712 and the inclined surfaces 711a and 711b, respectively.
- the connecting surfaces 713a and 713b are located between the inclined surfaces 711a and 711b and the contact surface 712 on the inner surface 710.
- the angle of the connecting surfaces 713a and 713b with respect to the third direction D3 is larger than the angle of the inclined surfaces 711a and 711b with respect to the third direction D3.
- the connecting surfaces 713a and 713b are flat surfaces and have an angle of 90 degrees with respect to the third direction D3.
- the connecting surfaces 713a and 713b are provided so that the core 8 can be stably brought into contact with the inclined surfaces 711a and 711b.
- the core 8 may be caught at the boundary portion between the inclined surface 711a and the contact surface 712. This is because in an actual product, due to a shape error, the angle between the inclined surface 711a and the contact surface 712 is smaller than the set angle at the boundary portion between the inclined surface 711a and the contact surface 712, or an unexpected shape. Because it becomes.
- the presence of the connecting surface 713a eliminates the possibility that the core 8 is caught at the boundary portion between the inclined surface 711a and the contact surface 712, so that the core 8 can be stably brought into contact with the inclined surfaces 711a and 711b.
- the inner surface 710 of the pair of side walls 71a and 71b of the bobbin 7 is configured as described above.
- the operation when the inner surfaces 710 of the pair of side walls 71a and 71b reduce the transmission of the impact from the bobbin 7 to the core 8 will be described in detail in "[3. Operation when an impact is applied to the case]". explain.
- the first end 72 has a rectangular parallelepiped shape.
- the first end portion 72 connects the second ends (left ends of FIGS. 7 and 8) of the pair of side walls 71a and 71b to each other.
- the second end 73 has a rectangular parallelepiped shape.
- the first ends (right ends of FIGS. 7 and 8) of the pair of side walls 71a and 71b are connected to each other.
- the holding plate 74 is used to hold the capacitor C1.
- the holding plate 74 has a rectangular plate shape.
- the holding plate 74 is arranged so as to connect the pair of side walls 71a, 71b to each other in the third region 70c of the pair of side walls 71a, 71b.
- the winding body 75 is used to hold the winding 63 constituting the third inductor.
- the winding body portion 75 has a rectangular parallelepiped shape.
- the winding body portion 75 projects from the first end portion 72.
- the winding body portion 75 projects from the first end portion 72 in a direction (second direction D2) orthogonal to the length direction of the pair of side walls 71a and 71b.
- the pair of protrusions 76 project in the third direction D3 from the portions of the pair of side walls 71a and 71b that are not surrounded by the winding 61.
- the pair of protrusions 76 project from the first end (upper end of FIG. 8) of the third direction D3 on the pair of side walls 71a and 71b.
- the pair of protrusions 76 are not physically directly connected to each other. Therefore, as shown in FIG. 5, the bobbin 7 has an opening 761 between the pair of protrusions 76.
- the protrusion amount of the pair of protrusions 76 is set so that the pair of protrusions 76 does not hit the case 3. That is, the pair of protrusions 76 do not come into direct contact with the case 3.
- An elastic member 4 is interposed between the pair of protrusions 76 and the case 3.
- the pair of protrusions 77 project in the third direction D3 from the portions of the pair of side walls 71a and 71b that are not surrounded by the winding 61.
- the pair of protrusions 77 project from the third end (lower end of FIG. 8) of the third direction D3 on the pair of side walls 71a and 71b.
- the pair of protrusions 77 are not physically directly connected to each other. Therefore, as shown in FIG. 5, the bobbin 7 has an opening 771 between the pair of protrusions 77.
- the protrusion amount of the pair of protrusions 77 is set so that the pair of protrusions 77 does not hit the case 3. That is, the pair of protrusions 77 do not come into direct contact with the case 3.
- An elastic member 4 is interposed between the pair of protrusions 77 and the case 3.
- the first to fourth connecting members 91 to 94 are formed of a conductive material such as a metal material.
- the first and second connecting members 91 and 92 have connection terminals 911 and 921 and winding terminals 912 and 922, respectively.
- the connection terminals 911 and 921 are rod-shaped.
- the connection terminals 911 and 921 project from the first end 72.
- the connection terminals 911 and 921 project to the opposite side of the pair of side walls 71a and 71b at the first end 72.
- the connection terminals 911 and 921 are used to electrically connect the antenna device 1 to an external drive circuit.
- the winding terminals 912 and 922 project from the first end 72.
- the winding terminals 912 and 922 project from the first end 72 in a direction (second direction D2) orthogonal to the length direction of the pair of side walls 71a and 71b.
- the protruding directions of the winding terminals 912 and 922 are opposite to each other.
- the third and fourth connection members 93 and 94 have winding terminals 931, 941 and connection terminals 932 and 942, respectively.
- the third and fourth connecting members 93 and 94 are fixed to the holding plate 74.
- the third and fourth connecting members 93 and 94 are fixed to the surface of the holding plate 74 opposite to the pair of side walls 71a and 71b.
- the winding 61 is composed of the conductor W1. More specifically, the conductor W1 is the first of the pair of side walls 71a, 71b of the bobbin 7 so that the axial direction of the winding 61 coincides with the length direction (first direction D1) of the pair of side walls 71a, 71b. It is wound around the region 70a. The portion of the conductor W1 wound around the first region 70a constitutes the winding 61. In this way, the winding 61 has a pair of side walls 71a with the first direction D1 as the axial direction. It is wound around the bobbin 7 so as to comprehensively surround 71b.
- the number of turns of the winding 61 is, for example, 100.
- Both ends of the conducting wire W1 are fixed to the winding terminal 922 of the second connecting member 92 and the winding terminal 941 of the fourth connecting member 94, respectively, and are electrically connected. Both ends of the conducting wire W1 are entwined and joined to, for example, winding terminals 922 and 941 respectively.
- the winding 62 is composed of the conductor W2. More specifically, the conductor W2 is the second of the pair of side walls 71a, 71b of the bobbin 7 so that the axial direction of the winding 62 coincides with the length direction (first direction D1) of the pair of side walls 71a, 71b. It is wound around the region 70b. The portion of the conductor W2 wound around the second region 70b constitutes the winding 62.
- the winding 63 is composed of the conductor W2. More specifically, the lead wire W2 is wound around the winding body portion 75 of the bobbin 7. The portion of the conductor W2 wound around the winding body portion 75 constitutes the winding 63. Since the winding body portion 75 projects in the second direction D2 from the first end portion 72, the axial direction of the winding 63 is a direction orthogonal to the first direction D1.
- both ends of the conducting 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. Both ends of the conducting wire W2 are entwined and joined to, for example, winding terminals 912 and 931, respectively.
- the capacitor C1 is held by the holding plate 74.
- the capacitor C1 is held by the third and fourth connecting members 93, 94 on the holding plate 74. Both ends of the capacitor C1 are fixed to the connection terminals 923 and 942 of the third and fourth connection members 93 and 94, respectively, and are electrically connected. In this way, the capacitor C1 is electrically connected in series with the first inductor.
- Case 3 accommodates the antenna body 2 as shown in FIGS. 1 and 2.
- the case 3 has a cylindrical shape extending in the first direction D1.
- the case 3 has, for example, a square cylinder extending in the first direction D1.
- the first end 31a of the first direction D1 of the case 3 is open, and the second end 31b of the first direction D1 of the case 3 is closed.
- the antenna body 2 is inserted into the case 3 from the first end 31a of the case 3.
- the case 3 has both side walls 32a and 32b in the second direction D2.
- the side walls 32a and 32b face the pair of side walls 71a and 71b, respectively.
- the side walls 32a and 32b are parallel to each other.
- the case 3 has both side walls 33a and 33b in the third direction D3.
- the side walls 33a and 33b are parallel to each other.
- the case 3 is formed of, for example, a non-magnetic resin material having an insulating property.
- the elastic member 4 is provided to reduce the transmission of impact from the case 3 to the bobbin 7.
- the elastic member 4 includes a first portion 41, a second portion 42, and a connecting portion 43.
- the first portion 41 is interposed between the antenna body 2 and the side wall portion 33a of the case 3.
- the second portion 42 is interposed between the antenna body 2 and the side wall portion 33b of the case 3. Therefore, the elastic member 4 reduces the impact in the third direction D3.
- the connecting portion 43 continuously and integrally connects the first portion 41 and the second portion 42.
- the connecting portion 43 is interposed between the antenna body 2 and the second end 31b of the case 3.
- the elastic member 4 is formed of, for example, a sponge, rubber, or the like.
- the connector 5 is used to mechanically connect the antenna device 1 to an external drive circuit.
- the connector 5 includes a fixing portion 51 and a tubular portion 52.
- the fixing portion 51 is used to connect the connector 5 to the first end portion 72 of the bobbin 7 of the antenna body 2.
- the tubular portion 52 comprehensively 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 case 3 so as to close the first end 31a of the case 3.
- the connector 5 is formed of, for example, a non-magnetic resin material having an insulating property.
- 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.
- 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 inductor and the third inductor are electrically connected in series to the series resonant circuit.
- the third inductor is electrically connected in series with the second inductor.
- the second inductor and the third inductor are used as a resistance circuit for adjusting the resistance value of the antenna device 1.
- the specific frequency is, for example, the resonance frequency of the series resonance circuit of the first inductor and the capacitor C1.
- the inner surfaces 710 of the pair of side walls 71a and 71b of the bobbin 7 are configured to reduce the transmission of impact from the bobbin 7 to the core 8.
- the vertical direction in FIG. 10 corresponds to the third direction D3.
- the downward D31 in FIG. 10 is the direction along the third direction D3.
- both 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 side walls 71a and 71b of the bobbin 7, respectively.
- the corner portions 81a to 81d of the core 8 are not in contact with the inclined surfaces 711a to 711d of the pair of side walls 71a and 71b of the bobbin 7, respectively.
- the inclined surface 711 overlaps the core 8 so as to be closer to the core 8 than the winding 61 in the third direction D3.
- the corner portions 81a and 81c of the core 8 come into contact with the inclined surfaces 711a and 711c of the pair of side walls 71a and 71b of the bobbin 7 without hitting the winding 61, respectively.
- the impact is transmitted from the bobbin 7 to the core 8, but the inclined surfaces 711a and 711c are inclined toward the core side in the second direction D2 so as to be separated from the core 8 in the third direction D3.
- the impact transmitted from the bobbin 7 to the core 8 is dispersed in the second direction D2 and the third direction D3. Therefore, the impact of the downward D31 transmitted from the bobbin 7 to the core 8 is further reduced. Further, since the contact between the core 8 and the winding 61 is prevented by the inclined surface 711, it is possible to prevent the winding 61 from being disconnected due to the contact between the core 8 and the winding 61.
- the core 8 receives the impact of the downward D31 from the bobbin 7. Since the contact surface 712 of the bobbin 7 has a surface shape that allows the core 8 to move in the third direction D3, the core 8 faces downward in FIG. 10 with respect to the bobbin 7, as shown third from the top of FIG. Move to D31. By moving the core 8 with respect to the bobbin 7, the impact on the core 8 is reduced.
- the inclined surface 711 overlaps the core 8 so as to be closer to the core 8 than the winding 61 in the third direction D3.
- the corner portions 81b and 81d of the core 8 come into contact with the inclined surfaces 711b and 711d of the pair of side walls 71a and 71b of the bobbin 7 without hitting the winding 61, respectively.
- the impact is transmitted from the bobbin 7 to the core 8, but the inclined surfaces 711b and 711d are inclined toward the core side in the second direction D2 so as to be separated from the core 8 in the third direction D3. Therefore, the impact transmitted from the bobbin 7 to the core 8 is dispersed in the second direction D2 and the third direction D3. Therefore, the impact of the downward D31 transmitted from the bobbin 7 to the core 8 is further reduced.
- the corner portions 81b, 81d of the core 8 are pushed by the inclined surfaces 711b, 711d of the pair of side walls 71a, 71b of the bobbin 7.
- the inclined surfaces 711b and 711d are inclined toward the core side in the second direction D2 so as to be separated from the core 8 in the third direction D3. Therefore, as shown at the bottom of FIG. 10, the pair of side walls 71a and 71b are pushed by the core 8 so as to be separated from each other in the second direction D2, and the corner portions 81b and 81d of the core 8 are inclined surfaces 711b. , 711d slide on.
- the transmission of the impact from the bobbin 7 to the core 8 is reduced in this way, and the impact applied to the core 8 is reduced. Further, in the antenna device 1, since the elastic member 4 is provided between the case 3 and the antenna body 2, the transmission of the impact from the case 3 to the bobbin 7 is also reduced. Therefore, in the antenna device 1, while reducing the transmission of the impact from the case 3 to the bobbin 7, the transmission of the impact from the bobbin 7 to the core 8 is also reduced.
- the antenna device 1 includes an antenna body 2 and a case 3 for accommodating the antenna body 2.
- the antenna body 2 has a bobbin 7, a winding 61, and a core 8.
- the bobbin 7 has a pair of side walls 71a and 71b.
- the pair of side walls 71a, 71b have inner surfaces 710 extending in the first direction D1 and facing each other in the second direction D2 intersecting the first direction D1.
- the winding 61 is wound around the bobbin 7 so as to comprehensively surround the pair of side walls 71a and 71b with the first direction D1 as the axial direction.
- the core 8 is held by the pair of side walls 71a, 71b so as to be located inside the winding 61 between the inner surfaces 710 of the pair of side walls 71a, 71b.
- Both of the inner surfaces 710 of the pair of side walls 71a, 71b include an inclined surface 711.
- the inclined surface 711 overlaps the core 8 so as to be closer to the core 8 than the winding 61 in the third direction D3 intersecting the first direction D1 and the second direction D2. It is tilted away from the core 8 in the three directions D3. According to this configuration, the impact applied to the core 8 can be reduced.
- the dimension of the pair of side walls 71a and 71b in the third direction D3 is larger than the dimension of the core 8 in the third direction D3. According to this configuration, it is possible to suppress the core 8 from protruding from the side walls 71a and 71b in the third direction D3, and it is possible to suppress the contact of the core 8 with the winding 61.
- both the inner surfaces 710 of the pair of side walls 71a and 71b include a pair of inclined surfaces 711 facing each other in the third direction D3. According to this configuration, it is possible to suppress the core 8 from protruding from the side walls 71a and 71b in the third direction D3, and it is possible to suppress the contact of the core 8 with the winding 61.
- both the inner surfaces 710 of the pair of side walls 71a and 71b have a contact surface 712 that contacts the side surface 82 of the core 8 in the second direction D2. According to this configuration, the movement of the core 8 can be restricted 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. According to this configuration, the impact applied to the core 8 can be released by the core 8 moving in the second direction D2, and the impact applied to the core 8 can be reduced.
- 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 configuration, the impact applied to the core 8 can be released by the core 8 moving in the second direction D2, and the impact applied to the core 8 can be reduced.
- At least one of the inner surfaces 710 of the pair of side walls 71a and 71b has a connecting surface 713 connecting the contact surface 712 and the inclined surface 711.
- the angle of the connecting surface 713 with respect to the third direction D3 is larger than the angle of the inclined surface 711 with respect to the third direction D3. According to this configuration, the inclined surface 711 and the core 8 can be stably contacted with each other.
- the angle of the connecting surface 713 with respect to the third direction D3 is 90 degrees
- the angle of the inclined surface 711 with respect to the third direction D3 is 45 degrees.
- the core 8 has a corner portion 81 facing the inclined surface 711 in the third direction D3.
- the corner portion 81 has a tapered shape. According to this configuration, the inclined surface 711 and the core 8 can be stably contacted with each other.
- the corner portion 81 may have an R shape.
- the bobbin 7 includes a pair of protrusions 76 protruding in the third direction D3 from a portion of the pair of side walls 71a and 71b not surrounded by the winding 61.
- the pair of protrusions 76 do not come into direct contact with the case 3. According to this configuration, the transmission of the impact from the case 3 to the bobbin 7 can be reduced, and the impact applied to the core 8 can be reduced.
- the bobbin 7 includes a pair of protrusions 77 protruding in the third direction D3 from a portion of the pair of side walls 71a and 71b not surrounded by the winding 61.
- the pair of protrusions 77 do not come into direct contact with the case 3. According to this configuration, the transmission of the impact from the case 3 to the bobbin 7 can be reduced, and the impact applied to the core 8 can be reduced.
- the bobbin 7 has an opening 761 between the pair of protrusions 76. According to this configuration, since the impact from the case 3 is not applied to the central portion of the core 8, the possibility of damage to the core 8 can be reduced. Further, in the antenna device 1, the bobbin 7 has an opening 771 between the pair of protrusions 77. According to this configuration, since the impact from the case 3 is not applied to the central portion of the core 8, the possibility of damage to the core 8 can be reduced.
- the core 8 has a rod shape extending in the first direction D1, and the dimension of the third direction D3 of the core 8 is smaller than the dimension of the second direction D2 of the core 8. According to this configuration, the impact in the third direction D3 where the strength of the core 8 becomes relatively weak can be reduced, and the possibility of damage to the core 8 can be reduced.
- the angle of the inclined surface 711 with respect to the third direction D3 is larger than 0 degrees and 45 degrees or less. According to this configuration, the force applied to the core 8 due to the impact can be dispersed so that the force in the third direction D3 is equal to or less than the force in the second direction D2. Therefore, the impact applied to the core 8 can be reduced.
- the angle of the inclined surface 711 with respect to the third direction D3 is 45 degrees.
- the dimension of the inclined surface 711 in the first direction D1 is equal to or larger than the dimension of the winding 61 in the first direction D1. According to this configuration, the inclined surface 711 can suppress the contact of the core 8 with the winding 61.
- the antenna device 1 further includes an elastic member 4 interposed between the antenna body 2 and the case 3 in the third direction D3. According to this configuration, the transmission of the impact from the case 3 to the bobbin 7 can be reduced, and the impact applied to the core 8 can be reduced.
- FIG. 11 is a partial perspective view of the antenna body 2 of the antenna device 1 of the modified example 1
- FIG. 12 is a sectional view taken along the line DD of FIG.
- the bobbin 7 has connecting portions 78a and 78b (hereinafter, collectively referred to as reference numerals 78).
- the connecting portions 78a and 78b connect the portions of the pair of side walls 71a and 71b that are not surrounded by the winding 61 to each other.
- the connecting portion 78a is on the first end (upper end in FIG. 12) side of the third direction D3 in the pair of side walls 71a and 71b.
- the connecting portions 78a and 78b can position the pair of side walls 71a and 71b and improve the overall strength of the bobbin 7.
- the connecting portion 78b is on the second end (lower end in FIG. 12) side of the third direction D3 in the pair of side walls 71a and 71b.
- the connecting portion 78 has a central portion 781 and both end portions 782 in the second direction D2.
- the surface of the connecting portion 78 opposite to the core 8 has a surface shape in which both end portions 782 protrude from the central portion 781. That is, the connecting portion 78 is more likely to hit the case 3 at both end portions 782 than the central portion 781. Therefore, the central portion 781 of the connecting portion 78 is less likely to come into contact with the core 8. According to the first modification, the impact from the case 3 is not applied to the central portion of the core 8, so that the possibility of damage to the core 8 can be reduced.
- FIG. 13 is a partial perspective view of the antenna body 2 of the antenna device 1 of the modified example 2
- FIG. 14 is a sectional view taken along line EE of FIG.
- the bobbin 7 has connecting portions 79a and 79b (hereinafter, collectively referred to as reference numeral 79).
- the connecting portions 79a and 79b connect portions of the pair of side walls 71a and 71b that are not surrounded by the winding 61 to each other.
- the connecting portion 79a is on the first end (upper end in FIG. 14) side of the third direction D3 in the pair of side walls 71a and 71b.
- the connecting portion 79b is on the second end (lower end in FIG.
- the connecting portions 79a and 79b can position the pair of side walls 71a and 71b and improve the overall strength of the bobbin 7.
- the connecting portion 79 has a central portion 791 and both end portions 792 in the first direction D1.
- the surface of the connecting portion 79 opposite to the core 8 has a surface shape in which both end portions 792 protrude from the central portion 791. That is, the connecting portion 79 is more likely to hit the case 3 at both end portions 792 than the central portion 791. Therefore, even when the connecting portion 79 comes into contact with the core 8, the range in which the force is applied to the core 8 can be expanded in the first direction D1. According to the second modification, the impact from the case 3 is less likely to be concentrated on one point in the first direction D1 of the core 8, so that the possibility of damage to the core 8 can be reduced.
- FIG. 15 is a cross-sectional view of the antenna device 1 of the modified example 3.
- the pair of side walls 71a and 71b of the bobbin 7 have openings 714a and 714b, respectively.
- the side wall 71a is composed of 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 constitutes the opening 714a.
- the inner surfaces 710 of the wall portions 71a1 and 71a2 include inclined surfaces 711a and 711b, respectively.
- the side wall 71b is composed of a pair of wall portions 71b1 and 71b2 facing each other in the third direction D3.
- each of the side walls 71a and 71b of the bobbin 7 may be composed of a plurality of members instead of one member.
- both the inner surfaces 710 of the pair of side walls 71a and 71b include the inclined surface 711.
- only one of the inner surfaces 710 of the pair of side walls 71a, 71b may include the inclined surface 711.
- at least one of the inner surfaces 710 of the pair of side walls 71a and 71b may include the inclined surface 711.
- the angle of the inclined surface 711 with respect to the third direction D3 does not have to be greater than 0 degrees and not less than 45 degrees.
- the inclined surface 711 is a plane having a constant inclination, but is not limited to this, and may be composed of a curved surface or a plurality of surfaces having different inclinations.
- the inclined surface 711 may have a shape that can convert a part of the component of the impact applied to the core 8 in the third direction D3 into the component of the second direction D2.
- the dimension of the pair of side walls 71a and 71b in the third direction D3 does not necessarily have to be larger than the dimension of the core 8 in the third direction D3.
- both the inner surfaces 710 of the pair of side walls 71a and 71b include the pair of inclined surfaces 711 facing each other in the third direction D3.
- only one of the inner surfaces 710 of the pair of side walls 71a, 71b may include the pair of inclined surfaces 711 facing each other in the third direction D3.
- at least one of the inner surfaces 710 of the pair of side walls 71a and 71b may include the pair of inclined surfaces 711 facing each other in the third direction D3.
- both the inner surfaces 710 of the pair of side walls 71a and 71b have the contact surface 712.
- only one of the inner surfaces 710 of the pair of side walls 71a, 71b may have the contact surface 712.
- at least one of the inner surfaces 710 of the pair of side walls 71a and 71b may have the contact surface 712.
- the contact surface 712 is not limited to a flat surface, and may be a surface having a plurality of protrusions having a flat tip.
- the contact surface 712 may have a surface shape that allows the core 8 to move in the third direction D3.
- the contact surface 712 does not have to have a surface shape that allows the core 8 to move in the third direction D3.
- the dimension of the third direction D3 of the contact surface 712 does not have to be larger than the dimension of the third direction D3 of the side surface 82 of the core 8.
- only one of the inner surfaces 710 of the pair of side walls 71a and 71b may have the connecting surface 713.
- at least one of the inner surfaces 710 of the pair of side walls 71a and 71b may have a connecting surface 713.
- the angle of the connecting surface 713 with respect to the third direction D3 does not have to be larger than the angle of the inclined surface 711 with respect to the third direction D3.
- the corner portion 81 of the core 8 may have a right-angled shape instead of a tapered shape or an R shape.
- the core 8 does not have to be rod-shaped extending in the first direction D1.
- the dimension of the third direction D3 of the core 8 does not have to be smaller than the dimension of the second direction D2 of the core 8.
- the bobbin 7 does not have to include the pair of protrusions 76 and the pair of protrusions 77. In one modification, the bobbin 7 may not have an opening 761 and an opening 771.
- the dimension of the inclined surface 711 in the first direction D1 does not have to be equal to or larger than the dimension of the winding 61 in the first direction D1.
- a plurality of inclined surfaces 711 may be provided along the first direction D1.
- the antenna device 1 does not have to include the elastic member 4. In one modification, the antenna device 1 may not include the connector 5.
- the antenna device 1 is a series resonant circuit including the first inductor and the capacitor C1, but is not limited thereto.
- the antenna device 1 may be, for example, a parallel resonant circuit.
- the antenna device 1 may have a conventionally known circuit structure, and may or may not be provided with another circuit element in addition to the first inductor and the capacitor C1.
- the antenna device 1 does not necessarily have to include windings 62 and 63.
- the first aspect is an antenna device (1), which includes an antenna body (2) and a case (3) for accommodating the antenna body (2).
- the antenna body (2) has a bobbin (7), a winding (61), and a core (8).
- the bobbin (7) has a pair of side walls (71a, 71b).
- the pair of side walls (71a, 71b) extend in a first direction (D1) and have inner surfaces (710) facing each other in a second direction (D2) intersecting the first direction (D1).
- the winding (61) is wound around the bobbin (7) so as to comprehensively surround the pair of side walls (71a, 71b) with the first direction (D1) as the axial direction.
- the core (8) is held by the pair of side walls (71a, 71b) so as to be located inside the winding (61) between the inner surfaces (710) of the pair of side walls (71a, 71b). At least one of the inner surfaces (710) of the pair of side walls (71a, 71b) includes an inclined surface (711).
- the inclined surface (711) is closer to the core (8) than the winding (61) in the third direction (D3) intersecting the first direction (D1) and the second direction (D2). It overlaps with the core (8) and inclines toward the core side in the second direction (D2) so as to be separated from the core (8) in the third direction (D3). According to this aspect, the impact applied to the core (8) can be reduced.
- the second aspect is the antenna device (1) based on the first aspect.
- the dimension of the pair of side walls (71a, 71b) in the third direction (D3) is larger than the dimension of the core (8) in the third direction (D3). According to this aspect, it is possible to suppress the core (8) from protruding from the side wall (71a, 71b) in the third direction (D3), and it is possible to suppress the contact of the core (8) with the winding (61).
- the third aspect is the antenna device (1) based on the first or second aspect.
- at least one of the inner surfaces (710) of the pair of side walls (71a, 71b) includes the pair of inclined surfaces (711) facing each other in the third direction (D3). According to this aspect, it is possible to suppress the core (8) from protruding from the side wall (71a, 71b) in the third direction (D3), and it is possible to suppress the contact of the core (8) with the winding (61).
- the fourth aspect is the antenna device (1) based on any one of the first to third aspects.
- at least one of the inner surfaces (710) of the pair of side walls (71a, 71b) is a contact surface (712) that contacts the side surface (82) of the core (8) in the second direction (D2).
- the movement of the core (8) can be restricted in the second direction (D2).
- the fifth aspect is the antenna device (1) based on the fourth aspect.
- the contact surface (712) has a surface shape that allows the core (8) to move in the third direction (D3). According to this aspect, the impact applied to the core (8) can be escaped by moving the core (8) in the second direction (D2), and the impact applied to the core (8) can be reduced.
- the sixth aspect is the antenna device (1) based on the fifth aspect.
- the dimension of the contact surface (712) in the third direction (D3) is larger than the dimension of the side surface (82) of the core (8) in the third direction (D3). According to this aspect, the impact applied to the core (8) can be escaped by moving the core (8) in the second direction (D2), and the impact applied to the core (8) can be reduced.
- the seventh aspect is the antenna device (1) based on any one of the fourth to sixth aspects.
- at least one of the inner surfaces (710) of the pair of side walls (71a, 71b) has a connecting surface (713) connecting the contact surface (712) and the inclined surface (711).
- the angle of the connecting surface (713) with respect to the third direction (D3) is larger than the angle of the inclined surface (711) with respect to the third direction (D3).
- the inclined surface (711) and the core (8) can be stably contacted with each other.
- the eighth aspect is the antenna device (1) based on any one of the first to seventh aspects.
- the core (8) has a corner portion (81) facing the inclined surface (711) in the third direction (D3).
- the corner portion (81) has a tapered shape or an R shape. According to this aspect, the inclined surface (711) and the core (8) can be stably contacted with each other.
- the ninth aspect is the antenna device (1) based on any one of the first to eighth aspects.
- the bobbin (7) is a pair of protrusions protruding in the third direction (D3) from a portion of the pair of side walls (71a, 71b) not surrounded by the winding (61). (76; 77).
- the pair of protrusions (76; 77) do not come into direct contact with the case (3). According to this aspect, the transmission of the impact from the case (3) to the bobbin (7) can be reduced, and the impact applied to the core (8) can be reduced.
- the tenth aspect is the antenna device (1) based on the ninth aspect.
- the bobbin (7) has an opening (761; 771) between the pair of protrusions (76; 77). According to this aspect, since the impact from the case (3) is not applied to the central portion of the core (8), the possibility of damage to the core (8) can be reduced.
- the eleventh aspect is the antenna device (1) based on any one of the first to tenth aspects.
- the bobbin (7) has a connecting portion (78) for connecting portions not surrounded by the winding (61) outside the pair of side walls (71a, 71b).
- the surface of the connecting portion (78) opposite to the core (8) has a surface shape in which both end portions (782) protrude from the central portion (781). According to this aspect, since the impact from the case (3) is not applied to the central portion of the core (8), the possibility of damage to the core (8) can be reduced.
- the twelfth aspect is the antenna device (1) based on any one of the first to eleventh aspects.
- the core (8) has a rod shape extending in the first direction (D1), and the dimension of the core (8) in the third direction (D3) is the dimension of the core (8). It is smaller than the dimension in the second direction (D2). According to this aspect, the impact in the third direction (D3) where the strength of the core (8) becomes relatively weak can be reduced, and the possibility of damage to the core (8) can be reduced.
- the thirteenth aspect is the antenna device (1) based on the twelfth aspect.
- the angle of the inclined surface (711) with respect to the third direction (D3) is larger than 0 degrees and 45 degrees or less. According to this aspect, the force applied to the core (8) due to the impact can be dispersed so that the force in the third direction (D3) is equal to or less than the force in the second direction (D2). Therefore, the impact on the core (8) can be reduced.
- the fourteenth aspect is the antenna device (1) based on any one of the first to thirteenth aspects.
- the dimension of the inclined surface (711) in the first direction (D1) is equal to or larger than the dimension of the winding (61) in the first direction (D1). According to this aspect, the inclined surface (711) can suppress the contact of the core (8) with the winding (61).
- the fifteenth aspect is the antenna device (1) based on any one of the first to the fourteenth aspects.
- the antenna device (1) further includes an elastic member (4) interposed between the antenna body (2) and the case (3) in the third direction (D3). .. According to this aspect, the transmission of the impact from the case (3) to the bobbin (7) can be reduced, and the impact applied to the core (8) can be reduced.
- This disclosure is applicable to antenna devices. Specifically, the present disclosure is applicable to an antenna device comprising a core held in a bobbin so as to be located inside the winding.
- Antenna device 2 Antenna body 3 Case 4 Elastic member 61 Winding 7 Bobbin 71a, 71b Side wall 710 Inner surface 711 (711a to 711d) Inclined surface 712 Contact surface 713 (713a to 713d) Connection surface 76 Protrusion 761 Opening 77 Protrusion 771 (78a, 78b) Connecting part 781 Central part 782 Both ends 8 core 81 (81a to 81b) Corner part 82 (82a, 82b) Side surface D1 1st direction D2 2nd direction D3 3rd direction
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Abstract
Description
[1.概要]
図1は、一実施の形態にかかるアンテナ装置1の構成例の斜視図である。図1のアンテナ装置1は、例えば、車載用アンテナ装置である。アンテナ装置1は、例えば、キーレスエントリを実現するために、車両のドア、コンソール、バンパ等に設置される。
以下、本実施の形態にかかるアンテナ装置1について詳細に説明する。
以上述べたように、本実施の形態において、ボビン7の一対の側壁71a,71bの内面710は、ボビン7からコア8への衝撃の伝達を低減するように構成されている。以下に、図10を参照して、一対の側壁71a,71bの内面710がボビン7からコア8への衝撃の伝達を低減する際の動作について説明する。なお、図10の上下方向が第3方向D3に対応する。図10の下向きD31は、第3方向D3に沿った向きである。
以上述べたように、アンテナ装置1は、アンテナ体2と、アンテナ体2を収容するケース3とを備える。アンテナ体2は、ボビン7と、巻線61と、コア8とを有する。ボビン7は、一対の側壁71a,71bを有する。一対の側壁71a,71bは、第1方向D1に延び、第1方向D1に交差する第2方向D2で互いに対向する内面710を有する。巻線61は、第1方向D1を軸方向として一対の側壁71a,71bを包括的に囲うようにボビン7に巻かれる。コア8は、一対の側壁71a,71bの内面710間で巻線61の内側に位置するように一対の側壁71a,71bで保持される。一対の側壁71a,71bの内面710の両方は、傾斜面711を含む。傾斜面711は、第1方向D1及び第2方向D2に交差する第3方向D3において巻線61よりもコア8に近接するようにコア8と重なり、第2方向D2においてコア側に向かうほど第3方向D3においてコア8から離れるように傾斜する。この構成によれば、コア8にかかる衝撃を低減できる。
本開示の実施の形態は、上記実施の形態に限定されない。上記実施の形態は、本開示の課題を達成できれば、設計等に応じて種々の変更が可能である。以下に、上記実施の形態の変形例を列挙する。以下に説明する変形例は、適宜組み合わせて適用可能である。
図11は、変形例1のアンテナ装置1のアンテナ体2の部分斜視図であり、図12は、図11のD-D線断面図である。図11及び図12に示すように、ボビン7は、連結部78a,78b(以下、総称して符号78を付す)を有する。連結部78a,78bは、一対の側壁71a,71bの外部において巻線61で囲まれていない部分同士を連結する。連結部78aは、一対の側壁71a,71bにおける第3方向D3の第1端(図12の上端)側にある。連結部78a,78bにより、一対の側壁71a,71bの位置決め及びボビン7の全体的な強度の向上が図れる。連結部78bは、一対の側壁71a,71bにおける第3方向D3の第2端(図12の下端)側にある。連結部78は、第2方向D2において、中央部781及び両端部782を有する。連結部78におけるコア8と反対側の面は、両端部782が中央部781よりも突出する面形状である。つまり、連結部78は、中央部781よりも両端部782でケース3に当たりやすい。そのため、連結部78の中央部781がコア8に接触しにくくなる。変形例1によれば、ケース3からの衝撃がコア8の中央部分にかからなくなるから、コア8の破損の可能性を低減できる。
図13は、変形例2のアンテナ装置1のアンテナ体2の部分斜視図であり、図14は、図13のE-E線断面図である。図13及び図14に示すように、ボビン7は、連結部79a,79b(以下、総称して符号79を付す)を有する。連結部79a,79bは、一対の側壁71a,71bの外部において巻線61で囲まれていない部分同士を連結する。連結部79aは、一対の側壁71a,71bにおける第3方向D3の第1端(図14の上端)側にある。連結部79bは、一対の側壁71a,71bにおける第3方向D3の第2端(図12の下端)側にある。連結部79a,79bにより、一対の側壁71a,71bの位置決め及びボビン7の全体的な強度の向上が図れる。連結部79は、第1方向D1において、中央部791及び両端部792を有する。連結部79におけるコア8と反対側の面は、両端部792が中央部791よりも突出する面形状である。つまり、連結部79は、中央部791よりも両端部792でケース3に当たりやすい。そのため、連結部79がコア8に接触した場合でも、コア8に力がかかる範囲を第1方向D1に広げることができる。変形例2によれば、ケース3からの衝撃がコア8の第1方向D1の一点に集中しにくくなるから、コア8の破損の可能性を低減できる。
図15は、変形例3のアンテナ装置1の断面図である。図15において、ボビン7の一対の側壁71a,71bは、それぞれ開口714a,714bを有する。より詳細には、側壁71aは、第3方向D3において互いに対向する一対の壁部71a1,71a2で構成される。一対の壁部71a1,71a2間の空間が開口714aを構成する。壁部71a1,71a2の内面710がそれぞれ傾斜面711a,711bを含む。側壁71bは、第3方向D3において互いに対向する一対の壁部71b1,71b2で構成される。一対の壁部71b1,71b2間の空間が開口714bを構成する。壁部71b1,71b2の内面710がそれぞれ傾斜面711c,711dを含む。このように、ボビン7の側壁71a,71bの各々は、一部材ではなく、複数部材で構成されていてもよい。
上記実施の形態では、一対の側壁71a,71bの内面710の両方が、傾斜面711を含む。一変形例では、一対の側壁71a,71bの内面710の一方だけが、傾斜面711を含んでよい。要するに、一対の側壁71a,71bの内面710の少なくとも一方が、傾斜面711を含んでいればよい。
上記実施の形態及び変形例から明らかなように、本開示は、下記の態様を含む。以下では、実施の形態との対応関係を明示するためだけに、符号を括弧付きで付している。
2 アンテナ体
3 ケース
4 弾性部材
61 巻線
7 ボビン
71a,71b 側壁
710 内面
711(711a~711d) 傾斜面
712 接触面
713(713a~713d) 接続面
76 突起
761 開口
77 突起
771 開口
78(78a,78b) 連結部
781 中央部
782 両端部
8 コア
81(81a~81b) 角部
82(82a,82b) 側面
D1 第1方向
D2 第2方向
D3 第3方向
Claims (15)
- アンテナ体と、
前記アンテナ体を収容するケースと、
を備え、
前記アンテナ体は、
第1方向に延び、前記第1方向に交差する第2方向で互いに対向する内面を有する一対の側壁を有するボビンと、
前記第1方向を軸方向として前記一対の側壁を包括的に囲うように前記ボビンに巻かれる巻線と、
前記一対の側壁の内面間で前記巻線の内側に位置するように前記一対の側壁で保持されるコアと、
を有し、
前記一対の側壁の内面の少なくとも一方は、傾斜面を含み、
前記傾斜面は、前記第1方向及び前記第2方向に交差する第3方向において前記巻線よりも前記コアに近接するように前記コアと重なり、前記第2方向において前記コア側に向かうほど前記第3方向において前記コアから離れるように傾斜する、
アンテナ装置。 - 前記一対の側壁の前記第3方向の寸法は、前記コアの前記第3方向の寸法より大きい、
請求項1に記載のアンテナ装置。 - 前記一対の側壁の内面の少なくとも一方は、前記第3方向において互いに対向する一対の前記傾斜面を含む、
請求項1又は2に記載のアンテナ装置。 - 前記一対の側壁の内面の少なくとも一方は、前記第2方向において前記コアの側面に接触する接触面を有する、
請求項1~3のいずれか一つに記載のアンテナ装置。 - 前記接触面は、前記第3方向において前記コアを移動可能とする面形状を有する、
請求項4に記載のアンテナ装置。 - 前記接触面の前記第3方向の寸法は、前記コアの前記側面の前記第3方向の寸法より大きい、
請求項5に記載のアンテナ装置。 - 前記一対の側壁の内面の少なくとも一方は、前記接触面と前記傾斜面とをつなぐ接続面を有し、
前記接続面の前記第3方向に対する角度は、前記傾斜面の前記第3方向に対する角度より大きい、
請求項4~6のいずれか一つに記載のアンテナ装置。 - 前記コアは、前記第3方向において前記傾斜面に対向する角部を有し、
前記角部は、テーパ形状又はR形状である、
請求項1~7のいずれか一つに記載のアンテナ装置。 - 前記ボビンは、前記一対の側壁において前記巻線で囲まれていない部分からそれぞれ前記第3方向に突出する一対の突起を備え、
前記一対の突起は、前記ケースに直接接触しない、
請求項1~8のいずれか一つに記載のアンテナ装置。 - 前記ボビンは、前記一対の突起間に開口を有する、
請求項9に記載のアンテナ装置。 - 前記ボビンは、前記一対の側壁の外部において前記巻線で囲まれていない部分同士を連結する連結部を有し、
前記連結部における前記コアと反対側の面は、両端部が中央部よりも突出する面形状である、
請求項1~10のいずれか一つに記載のアンテナ装置。 - 前記コアは、前記第1方向に延びる棒状であり、
前記コアの前記第3方向の寸法は、前記コアの前記第2方向の寸法より小さい、
請求項1~11のいずれか一つに記載のアンテナ装置。 - 前記傾斜面の前記第3方向に対する角度は、0度より大きく45度以下である、
請求項12に記載のアンテナ装置。 - 前記傾斜面の前記第1方向の寸法は、前記巻線の前記第1方向の寸法以上である、
請求項1~13のいずれか一つに記載のアンテナ装置。 - 前記第3方向において、前記アンテナ体と前記ケースとの間に介在される弾性部材をさらに備える、
請求項1~14のいずれか一つに記載のアンテナ装置。
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CN202180077705.1A CN116636083A (zh) | 2020-12-23 | 2021-10-05 | 天线装置 |
JP2022571074A JP7318830B2 (ja) | 2020-12-23 | 2021-10-05 | アンテナ装置 |
US18/339,582 US20230344130A1 (en) | 2020-12-23 | 2023-06-22 | Antenna device |
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JP (1) | JP7318830B2 (ja) |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60203002A (ja) * | 1984-03-28 | 1985-10-14 | Matsushita Electric Ind Co Ltd | フエライトアンテナ組立法 |
JPH0613213U (ja) * | 1992-07-20 | 1994-02-18 | ミツミ電機株式会社 | アンテナコイル装置 |
WO2018216453A1 (ja) * | 2017-05-25 | 2018-11-29 | 株式会社村田製作所 | アンテナ装置 |
-
2021
- 2021-10-05 WO PCT/JP2021/036770 patent/WO2022137718A1/ja active Application Filing
- 2021-10-05 CN CN202180077705.1A patent/CN116636083A/zh active Pending
- 2021-10-05 JP JP2022571074A patent/JP7318830B2/ja active Active
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- 2023-06-22 US US18/339,582 patent/US20230344130A1/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60203002A (ja) * | 1984-03-28 | 1985-10-14 | Matsushita Electric Ind Co Ltd | フエライトアンテナ組立法 |
JPH0613213U (ja) * | 1992-07-20 | 1994-02-18 | ミツミ電機株式会社 | アンテナコイル装置 |
WO2018216453A1 (ja) * | 2017-05-25 | 2018-11-29 | 株式会社村田製作所 | アンテナ装置 |
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CN116636083A (zh) | 2023-08-22 |
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