WO2008062588A1 - Enroulement d'antenne - Google Patents

Enroulement d'antenne Download PDF

Info

Publication number
WO2008062588A1
WO2008062588A1 PCT/JP2007/065619 JP2007065619W WO2008062588A1 WO 2008062588 A1 WO2008062588 A1 WO 2008062588A1 JP 2007065619 W JP2007065619 W JP 2007065619W WO 2008062588 A1 WO2008062588 A1 WO 2008062588A1
Authority
WO
WIPO (PCT)
Prior art keywords
coil
antenna coil
bobbin
magnetic core
case
Prior art date
Application number
PCT/JP2007/065619
Other languages
English (en)
Japanese (ja)
Inventor
Yoshihiro Sako
Kenji Naito
Takaaki Ooi
Original Assignee
Murata Manufacturing Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co., Ltd. filed Critical Murata Manufacturing Co., Ltd.
Publication of WO2008062588A1 publication Critical patent/WO2008062588A1/fr

Links

Classifications

    • 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
    • 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

Definitions

  • the present invention relates to a transmitting antenna coil, and more particularly to an antenna coil used in a short-range communication system using LF band electromagnetic waves.
  • the short-range communication system in the LF band (30 kHz to 300 kHz) is mainly used for a keyless entry system that remotely operates locking and unlocking of a vehicle door.
  • the antenna coil for transmission in this system is formed by winding a coil around a bobbin with a magnetic core inserted therein, and housing these in a case, and is usually built in a door handle or side mirror of a vehicle.
  • the electromagnetic wave is supplied to the receiving antenna coil held by the user. Since a large impact is applied to the door handle and side mirror of a vehicle incorporating a transmitting antenna coil when the door is opened and closed, the transmitting antenna coil is required to have impact resistance.
  • Patent Document 1 discloses a structure of an antenna coil that can be used as a transmitting antenna coil in a keyless entry system.
  • FIG. 5 is a perspective view showing the structure of the antenna coil described in Patent Document 1.
  • FIG. An antenna coil 900 described in Patent Document 1 includes a case 902 having an open side surface and a wound body 904 accommodated in the case 902.
  • a wound body 904 is formed by winding a coil 910 around a bobbin 908 that surrounds a magnetic core 906.
  • the bobbin 908 is provided with an extending portion 930, and the external connection lines 920a and 920b and the coil 910 are electrically connected through a circuit pattern formed in the extending portion 930.
  • a gap between the wound body 904 and the case 902 is filled with a highly flexible adhesive (not shown).
  • the adhesive is injected with an opening force provided on one side of the case 902.
  • an antenna coil having excellent environmental characteristics such as temperature and humidity resistant to vibration and impact is formed by filling with an adhesive.
  • Patent Document 1 JP 2005-295473 A Disclosure of the invention
  • an object of the present invention is to provide an antenna coil that is easy to manufacture and has high impact resistance.
  • the present invention has the following configuration.
  • An antenna coil according to claim 1 includes a flat magnetic core, a bobbin surrounding the magnetic core, a coil wound around the bobbin, the magnetic core, the bobbin, and the bobbin. And a case having an opening at least at one end.
  • the bobbin has at least two legs extending in the coil axis direction of the coil along the magnetic core. And an arch-shaped bridging portion bridged between the leg portions, wherein the bridging portion has flexibility.
  • the antenna coil according to claim 2 is the antenna coil according to claim 1, wherein the bridging portion is arched by reducing a distance between the leg portions by a winding pressure of the coil. It is characterized by forming a shape.
  • An antenna coil according to claim 3 is the antenna coil according to claim 2, wherein the bobbin is integrally formed of a flexible material.
  • the antenna coil according to claim 4 is wound around the antenna coil according to any one of claims 1 to 3, and the coil is wound around the bridging portion. /, Characterized by that.
  • An antenna coil according to claim 5 is the antenna according to any one of claims 1 to 4.
  • a coil is provided with a plurality of the bridging portions! /.
  • the antenna coil according to claim 6 is the antenna coil according to claim 5, wherein the bridging portions are provided on both outer sides of the magnetic core.
  • the antenna coil according to claim 7 is the antenna coil according to any one of claims 1 to 6, wherein the bobbin includes a lid portion that seals the opening.
  • FIG. 1 is a diagram showing a configuration of an antenna coil according to a first embodiment of the present invention.
  • (A) is a plan view and
  • (b) is a side view.
  • FIG. 2 is a cross-sectional view showing the configuration of the antenna coil according to the first embodiment of the present invention.
  • FIG. 3 is a plan view showing a configuration of an antenna coil according to a second embodiment of the present invention.
  • FIG. 4 is a plan view showing a configuration of an antenna coil according to a third embodiment of the present invention.
  • FIG. 5 is a perspective view showing a configuration of an antenna coil shown in a conventional example.
  • 106 Magnetic core, 108, 208, 308 ... Bobbins, 110, 210 ... Coinole, 112 ... Base part, 114a, 114b ... Legs, 116a, 116b, 216a, 216b ... Bridged part, 118 ... Cap, 120a, 120b ... External connection lines.
  • FIG. 1 is a diagram showing the structure of an antenna coil according to the first embodiment, where (a) is a plan view and (b) is a side view. In Fig. 1, the case is shown transparently so that the inside can be seen.
  • FIG. 2 is a cross-sectional view taken along the line AA shown in FIG.
  • the antenna coil 100 includes a case 102 and a case.
  • a wound body 104 housed in the sleeve 102 is provided.
  • the case 102 is a flat tube with one end open and the other end closed, and is made of plastic.
  • a cap 1 18 is fitted in the opening of the case 102 to seal the case 102.
  • the cap 118 is provided with through holes (not shown) through which the external connection lines 120a and 120b pass, and a slight gap between the through hole and the external connection lines 120a and 120b, as well as the cap 118 and the key.
  • the slight gap between the sleeve 102 is filled with a sealing material (not shown).
  • the wound body 104 includes a magnetic core 106, a bobbin 108 surrounding the magnetic core 106, and a coil 110 wound around the bobbin 108.
  • the magnetic core 106 is made of Mn Zn ferrite exhibiting ferromagnetism and other amorphous magnetic materials, and these magnetic powders are compression-molded into a flat plate shape and fired.
  • the bobbin 108 includes a base portion 112 and leg portions 114a and 114b connected to the base portion 112, and a bridge portion 116a and 116b force bridged between the leg portions 114a and 114b.
  • the legs 114a and 114b are formed along the side surface of the magnetic core 106. Further, as shown in FIG.
  • the bridging portions 116a and 116b are formed on both outer sides of the magnetic core 106 in plan view, and as shown in FIG. 2, the magnetic core 106 is formed at the center of the bridging portions 116a and 116b.
  • a curved arch shape is drawn so that the gap between the The coil 110 is wound around the legs 114a and 114b of the bobbin 108, and the coil axis of the coil 110 is parallel to the legs 114a and 114b.
  • the end of the coil 110 is connected to the external connection lines 120a and 120b.
  • the coinole 110 is not wound around the bridges 116a and 116b.
  • the bridging portions 116a and 116b are flexible because the bridging portions 116a and 116b are curved, even if external stress is transferred to the case 102 and further to the bridging portions 116a and 116b, The bridging portions 116a and 116b absorb external stress and hardly conduct to the magnetic core 106. In addition, since the bridges 116a and 116b are curved, a space is created between the bridges 116a and 116b and the magnetic core 106, so that external stress is not directly transmitted to the magnetic core 106. . Thereby, it is suppressed that the magnetic body core 106 is damaged.
  • the bridging portions 116a and 116b are provided on both outer sides of the magnetic core 106, the external core Even if the stress is applied from any direction, the bridging portions 116a and 116b absorb the stress, so that the protection of the magnetic core 106 is further strengthened.
  • the winding start position and the winding end position of the coil 110 can be defined by the bridging portions 116a and 116b. .
  • the bridging portions 116a and 116b are curved to form an arch shape.
  • the bobbin 108 having an arch shape may be formed in advance by plastic processing.
  • the distance between the two legs 114a and 114b of the bobbin 108 and the length of the base part 112 in the direction perpendicular to the coil axis are designed to be larger than the width of the magnetic core, and the coil 110 is fixed to the leg 1 When winding around 14a, 114b, tighten the coil 110 to apply pressure in the direction of the magnetic core 106 to the legs 114a, 1 14b to reduce the distance between the legs 114a, 114b.
  • the bridge portions 116a and 116b that bridge the leg portions 114a and 114b may be curved.
  • an arch shape can be formed very easily without the need to mold a plastic using a special mold.
  • the legs 114a and 114b and the bridging portions 116a and 116b constituting the bobbin 108 are integrally formed of a flexible material such as plastic. ! /, I like to do it! /
  • the magnetic core 106 is inserted between the two legs 114a and 114b of the bobbin 108 having the base part 112, the legs 114a and 114b, and the bridging parts 116a and 116b.
  • the coil 110 is wound around the bobbin 108 and the coil 110 is tightly wound to form an arch shape.
  • the end of the coil 110 is connected to the external connection lines 120a and 120b, and the wound body 104 and the external connection lines 120a and 120b are integrated into the case 102 and inserted.
  • the cap 118 is attached and sealed with a sealing material.
  • the arch shape of the bridging portions 116a and 116b is formed in the winding process of the coil 110, and the impact resistance of the antenna coil 100 is improved.
  • a force that requires an extra step of injecting an adhesive for improving impact resistance is required in the present invention. Such a process is not required.
  • the arch shape is formed in the bobbin 108 forming process, and the impact resistance is increased, so that a separate process is not necessary. Therefore, impact resistance can be improved without increasing the number of steps.
  • a plurality of force bridging portions 116a, 116b formed so that the bridging portions 116a, 116b are positioned on both outer sides of the magnetic core 106 in a plan view are not necessarily provided. Even a single bridging portion has an effect of increasing the impact resistance of the antenna coil 100. Further, the formation location of the bridging portions 116a and 116b is not limited to the above location.
  • the coil 110 is not wound around the bridging portions 116a and 116b, but the coil 110 can be wound around the bridging portions 116a and 116b. However, if the coil 110 is wound around the bridging portions 116a and 116b, the coil 110 may be unwound or loosened by the stress applied to the bridging portions 1 16a and 116b. It is preferable that the coil 110 is not wound around. In particular, when the arch shape of the bridging portions 116a and 116b is formed by tightening the coil 110, it is preferable that the coil 110 is not wound around the bridging portions 116a and 116b in order to facilitate arch formation.
  • the force base portion 112 provided with the base portion 112 on the bobbin 108 serves to connect the leg portions 114a and 114b.
  • the bridge portions 116a and 116b are used. Since the legs 114a and 114b are connected, the base 112 may not be provided. Two or more legs 114a and 114b may be provided. Second embodiment
  • FIG. 3 is a plan view showing the structure of the antenna coil according to the second embodiment. Portions having the same configuration as that of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
  • a characteristic of the antenna coil 200 according to the second embodiment is the shape of the bobbin 208 that constitutes the wound body 204.
  • Bobbin 208 is connected to base part 112 and base part 1 12 It consists of legs 114a and 114b.
  • the bridge portions 216a, 216b, 216c, and 216d are formed so as to bridge the legs 114a and 114b. It is wound around the coinore 210 formed around the bobbin 208 by dividing the bridge portions 216b and 216c into partitions (21 la, 211b and 211c).
  • the bridging portions 216a, 216b, 216c, and 216d have an arch shape that is curved so that the distance from the magnetic core 106 is large at the center. Therefore, even if the stress is applied to the case 102 force or the bridge ⁇ 216a, 216b, 216c, 216d, it can be transmitted to the magnetic core 106, and the magnetic core 106 can be prevented from being damaged.
  • the bridges 216a, 216b, 216c, and 216d are provided at four locations, the effect is even greater than in the first embodiment.
  • This embodiment of the present invention also serves to form the coil portions 211a, 211b, and 211c by separating the bridges 216a, 216b, 216c, and 216di.
  • By dividing into a plurality of coil portions 211a, 211b, and 211c there is an advantage that the number of turns of each of the coilers 211a, 211b, and 211c can be arbitrarily set, and fine adjustment of the inductance can be performed. It should be noted that it is not necessary for all the bridges 216a, 216b, 216c, and 216d to have 210 coins wound around r ⁇ . For example, in FIG.
  • the coil portion may not be formed between the bridging portion 216b and the bridging portion 216c, and may be a non-winding portion.
  • the non-winding portion magnetic flux leaks from the non-winding portion, so that an increase in inductance is suppressed. Accordingly, the Q value of the antenna coil 200 can be reduced, and an antenna coil that can be used in a wider band can be configured.
  • FIG. 4 is a plan view showing the structure of the antenna coil according to the third embodiment. Portions having the same configuration as that of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
  • a first feature of the antenna coil 300 according to the third embodiment is that the bobbin 308 includes a lid portion 322 together with the base portion 112, the leg portions 114a and 114b, and the bridging portions 116a and 116b. Similar to the cap in the first embodiment, the lid 322 fits into the opening of the case 102, and unlike the first embodiment, is formed integrally with the bobbin 308. Gatsutsu Thus, the number of parts is reduced in the manufacture of the antenna coil 300, and the antenna coil 300 can be manufactured very easily and inexpensively. Further, since the lid 322 fixed in contact with the case 102 is formed integrally with the bobbin 308, the bobbin 308 force S and the case 102 force can be kept floating. As a result, it is possible to realize an antenna coil 300 having a structure in which external shocks are not easily transmitted to the bobbin 308 and the shock resistance is high.
  • the bobbin 308 in the antenna coil 300 connects the leg portions 114a and 114b, and the lid portion 322, the base portion 112, and the bridging portions 116a and 116b are in this order. They are formed in parallel.
  • the cross section of the lid portion 322 is so that the lid portion 322 and the case 102 are in close contact with each other when the wound body 304 formed by winding the coil 110 around the bobbin 308 surrounding the magnetic core 106 is inserted into the case 102. Designed to be approximately equal to 102 cross section.
  • the lid 322 includes a through hole through which the two external connection lines 120a and 120b are passed.
  • a slight gap between the through hole and the external connection lines 120a and 120b and a slight gap between the case inner wall and the lid portion 322 are filled with a sealing material. This enhances the sealing of the case 102 and improves the environmental resistance of the antenna coil 300.
  • a second feature of the antenna coil 300 according to the third embodiment is that a capacitor 324 is mounted on a bobbin 308.
  • One electrode 325b of the capacitor 324 is connected to the coil 110, and the other electrode 325a is connected to the external connection line 120b.
  • the coil 110 is connected to the external connection line 120a!
  • Capacitor 324 forms a resonant circuit together with coil 110.
  • a third feature of the antenna coil 300 according to the third embodiment is that a small core 326 for adjusting the inductance of the coil 110 is provided.
  • the bobbin 308 is formed with a bottomed hole 327, and the small core 326 is accommodated in the bottomed hole 327.
  • the small core 326 is disposed at a position where the magnetic flux of the coin 110 passes and has an elliptical shape. Inside bottomed hole 327 When the small core 326 is rotated, the distance between the small core 326 and the magnetic core 106 changes, and the coupling amount of the magnetic flux changes. Therefore, the inductance of the coil 110 can be adjusted by rotating the small core 326.
  • the force S that realizes the antenna coil with higher performance by providing the second and third features is not limited to the embodiment including these.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Support Of Aerials (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

La présente invention concerne un enroulement d'antenne facile à fabriquer et doté d'une résistance aux chocs élevée. Dans l'enroulement d'antenne, un enroulement est enroulé sur une bobine dans laquelle un noyau de plaque plat d'un matériau magnétique est inséré, ceux-ci étant intégrés dans un coffret qui s'ouvre à l'une de ses extrémités. La bobine comprend au moins deux parties de pied s'étendant dans la direction axiale de l'enroulement le long du noyau et une partie en pont passant entre les parties de pied. La partie en pont est en forme d'arc et se montre souple face à un impact. De préférence, la partie en pont est en forme d'arc en réduisant la distance entre les parties de pied par la pression d'enroulement de l'enroulement.
PCT/JP2007/065619 2006-11-24 2007-08-09 Enroulement d'antenne WO2008062588A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006317021 2006-11-24
JP2006-317021 2006-11-24

Publications (1)

Publication Number Publication Date
WO2008062588A1 true WO2008062588A1 (fr) 2008-05-29

Family

ID=39429529

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/065619 WO2008062588A1 (fr) 2006-11-24 2007-08-09 Enroulement d'antenne

Country Status (2)

Country Link
TW (1) TW200826367A (fr)
WO (1) WO2008062588A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011259237A (ja) * 2010-06-09 2011-12-22 Hitachi Metals Ltd アンテナ用ボビン、および低周波アンテナ
JP2016095775A (ja) * 2014-11-17 2016-05-26 Tdk株式会社 無線識別タグ
JP2016095777A (ja) * 2014-11-17 2016-05-26 Tdk株式会社 無線識別タグ
CN107257013A (zh) * 2013-08-09 2017-10-17 胜美达集团株式会社 天线线圈部件
JP2018006383A (ja) * 2016-06-27 2018-01-11 Tdk株式会社 コイル装置
CN108281793A (zh) * 2013-06-19 2018-07-13 胜美达集团株式会社 天线用线圈设备及其制造方法
CN109066049A (zh) * 2018-07-18 2018-12-21 卢氏县地质勘查研究所 一种核磁共振高效纳米陶瓷发射天线
CN110892582A (zh) * 2017-07-25 2020-03-17 株式会社村田制作所 天线线圈及其制造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55148343U (fr) * 1979-04-10 1980-10-25
JP2004264288A (ja) * 2003-02-12 2004-09-24 Citizen Watch Co Ltd アンテナを固定する構造及びそれを用いた電波修正時計
JP2005295473A (ja) * 2004-04-06 2005-10-20 Toko Inc アンテナコイル

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55148343U (fr) * 1979-04-10 1980-10-25
JP2004264288A (ja) * 2003-02-12 2004-09-24 Citizen Watch Co Ltd アンテナを固定する構造及びそれを用いた電波修正時計
JP2005295473A (ja) * 2004-04-06 2005-10-20 Toko Inc アンテナコイル

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011259237A (ja) * 2010-06-09 2011-12-22 Hitachi Metals Ltd アンテナ用ボビン、および低周波アンテナ
CN108281793A (zh) * 2013-06-19 2018-07-13 胜美达集团株式会社 天线用线圈设备及其制造方法
CN107257013A (zh) * 2013-08-09 2017-10-17 胜美达集团株式会社 天线线圈部件
CN107257010A (zh) * 2013-08-09 2017-10-17 胜美达集团株式会社 天线线圈部件的制造方法
JP2016095775A (ja) * 2014-11-17 2016-05-26 Tdk株式会社 無線識別タグ
JP2016095777A (ja) * 2014-11-17 2016-05-26 Tdk株式会社 無線識別タグ
JP2018006383A (ja) * 2016-06-27 2018-01-11 Tdk株式会社 コイル装置
CN110892582A (zh) * 2017-07-25 2020-03-17 株式会社村田制作所 天线线圈及其制造方法
CN109066049A (zh) * 2018-07-18 2018-12-21 卢氏县地质勘查研究所 一种核磁共振高效纳米陶瓷发射天线

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