WO2008072496A1 - アンテナコイル - Google Patents
アンテナコイル Download PDFInfo
- Publication number
- WO2008072496A1 WO2008072496A1 PCT/JP2007/073301 JP2007073301W WO2008072496A1 WO 2008072496 A1 WO2008072496 A1 WO 2008072496A1 JP 2007073301 W JP2007073301 W JP 2007073301W WO 2008072496 A1 WO2008072496 A1 WO 2008072496A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- foam
- antenna coil
- case
- magnetic core
- wound body
- Prior art date
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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/40—Radiating elements coated with or embedded in protective material
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 transmitting antenna coil in this system is formed by winding a coil around a bobbin that surrounds a magnetic core and housing these in a case. Usually, it is built in a door handle or side mirror of a vehicle. Electromagnetic waves are supplied to the receiving antenna coil owned by the user.
- 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. 7 is a perspective view showing the structure of the antenna coil described in Patent Document 1.
- FIG. An antenna coil 500 described in Patent Document 1 includes a wound body 504 and a case 502 that houses the wound body 504.
- the wound body 504 includes a magnetic core 506, a bobbin 508 surrounding the magnetic core 506, and a coil 510 wound around the bobbin 508. Vacuum casting is required in the gap between the wound body 504 and the case 502.
- Patent Document 1 a defoamed body from which bubbles are defoamed is used as the potting material 522. Furthermore, by configuring the defoaming body with a flexible rubber material, static deformation and load applied to the case 502 are absorbed by the deformation of the defoaming body, and the magnetic body is passed through the defoaming body. This prevents static deformation and load from being transmitted to the core 506.
- Patent Document 1 JP 2001-358522 A
- the defoaming body is filled without any gap between the case 502 and the wound body 504, the defoaming body does not deform when the case 502 is deformed or a load is applied.
- Core 506 There is a high possibility that deformation and load will be conducted. Further, even when a rubber material was used for the defoaming body, it was not possible to prevent damage to the magnetic core 506, which has poor responsiveness to instantaneous deformation and load.
- the wound body 504 is displaced due to the deformation of the defoamed body, and a thin portion is generated in the defoamed body.
- the ability to absorb deformation and load may decrease, or the magnetic core 506 may be hardened in a state where stress is applied, which may cause damage to the magnetic core 506.
- an object of the present invention is to provide an antenna coil suitable for an LF band short-range communication system by preventing damage to a magnetic core.
- the present invention has the following configuration.
- An antenna coil according to claim 1 includes a magnetic core, a bobbin surrounding the magnetic core, a coil wound around the bobbin, a powerful wound body, and the wound body. And a foam provided in a gap between the wound body and the case, and the foam is compressed by 45 to 65% based on a thickness in an unloaded state. It is characterized by being
- the antenna coil according to claim 2 is the antenna coil according to claim 1, wherein the foam is compressed by 57 to 64% based on the thickness in an unloaded state! / Features.
- the antenna coil according to claim 3 is the antenna coil according to claim 2, wherein the foam is compressed by 59 to 62% on the basis of the thickness in an unloaded state! Features.
- the antenna coil according to claim 4 is the antenna coil according to claims 1 to 3, further comprising a cap that is fitted to the case and supports one end of the wound body. To do.
- the antenna coil according to claim 5 is the antenna coil according to claim 4, wherein the foam is provided on the other end side of the wound body.
- An antenna coil according to claim 6 is the antenna according to any one of claims 1 to 5.
- the coil includes a gel body between the foam and the case. The invention's effect
- FIG. 1 is a plan view showing a structure of an antenna coil according to a first embodiment of the present invention.
- FIG. 2 is a cross-sectional view showing the structure of the antenna coil according to the first embodiment of the present invention.
- FIG. 3 is a graph showing the results of Experiment 1.
- FIG. 4 is a graph showing the results of Experiment 1.
- FIG. 5 is a graph showing the results of Experiment 2.
- FIG. 6 is a plan view showing a structure of an antenna coil according to a second embodiment of the present invention.
- FIG. 7 is a plan view showing a structure of an antenna coil shown in a conventional example.
- FIG. 1 is a plan view showing the structure of the antenna coil according to the first embodiment.
- FIG. 2 is a cross-sectional view taken along the line AA in FIG. Figures 3 and 4 show the results of Experiment 1. It is a graph.
- Figure 5 is a graph showing the results of Experiment 2.
- the antenna coil 100 is formed by inserting a wound body 104 into a case 102.
- the case 102 is a flat tube having one end opened and the other end closed, and is made of a plastic.
- a cap 120 is fitted into the opening of the case 102 to seal the case 102.
- a through hole (not shown) is formed in the cap 120, and external connection lines 118a and 118b are inserted into the through hole.
- the external connection lines 118a and 118b are preferably formed from a flexible material. As a result, the impact applied from the cap 120 side can be reduced.
- the external connection lines 118a and 118b and the wound body 104 are connected, and the wound body 104 is held at the center of the case 102 by fitting the cap 120 into the case 102.
- the structure in which the wound body 104 is supported by the cap 120 allows a certain gap to be provided between the wound body 104 and the case 102, and the impact applied to the case 102 is less likely to be applied to the wound body 104.
- the gap between cap 120 and case 102 and the gap between cap 120 and external connection lines 118a and 118b are filled with sealing material (not shown), making it less susceptible to temperature and humidity. Yes.
- It is also possible to provide a waterproof measure by disposing the cap 120 inside the end portion of the case 102 and filling a resin such as epoxy between the end portion of the case 102 and the cap 120.
- the wound body 104 includes a magnetic core 106, a bobbin 108 surrounding the magnetic core 106, and a coinore 110 wound around the bobbin 108.
- the magnetic core 106 is made of Mn—Zn ferrite and other amorphous magnetic materials, and these magnetic fine powders are compression-molded into a flat plate shape and fired.
- the bobbin 108 protects the magnetic core 106 and prevents the magnetic core 106 from being damaged by deformation or impact applied during manufacture or use of the product.
- 112 and legs 114a and 114b are formed by integral molding of PBT (polybutylene terephthalate).
- the front end portion 116 and the base portion 112 connect leg portions 114a and 114b formed along the magnetic core 106.
- the coin 110 is wound around the legs 114a and 114b, and the coil axis of the coin 110 is parallel to the legs 114a and 114b.
- An opening is formed in the distal end portion 116, and the magnetic core 106 is inserted with this opening force, and the bobbin 108 surrounds the magnetic core 106.
- a capacitor 124 is mounted on the base portion 112.
- One electrode of the capacitor 124 is connected to the coil 110, and the other electrode is connected to the external connection line 118b.
- the coil 110 is connected to the external connection line 118a.
- the capacitor 124 and the coil 110 constitute a resonance circuit.
- the base part 112 further includes a small core 126.
- a bottomed hole 127 is formed in the base portion 112, and a small core 126 is accommodated in the bottomed hole 127.
- the small core 126 is arranged at a position where the magnetic flux of the coil 110 passes and has an elliptical shape.
- the force S is used to adjust the inductance of the coil 110.
- a foam 122 is provided in a gap between the wound body 104 and the case 102, and covers the whole from one end supported by the cap 120 of the wound body 104 to the other end facing the same. ing.
- a foamed urethane foam or foamed silicon foam sheet is used as the foam 122, and the foam 122 is adhered to the wound body 104 by a double-sided adhesive sheet attached on one side.
- the foam body 122 is uniformly formed around the wound body 104, so that the foam body 122 is not formed unevenly in the case 102.
- the foam 122 can absorb the impact S regardless of the direction of the case 102 from which the impact is applied.
- the foam 122 contains bubbles, it is possible to prevent the foam 122 from absorbing a momentary impact and conducting a load or deformation to the magnetic core 106. Therefore, it is possible to protect the magnetic core 106 from being damaged.
- a force in which the foam 122 is formed in the entire gap between the case 102 and the wound body 104 is formed in the entire gap between the case 102 and the wound body 104.
- the foam 122 is formed only in a part of the gap between the case 102 and the wound body 104. Even so, it is possible to absorb the impact applied from the outside of the case 102 and protect the magnetic core 106 from damage.
- the foam 122 is a cap of the wound body 104. It is preferably formed on the end side not supported by 0. This is because one end supported by the cap 120 is less likely to fluctuate even when an external impact is applied, but it is supported and the other end is likely to fluctuate due to the impact.
- the antenna coil 100 is formed by integrating the members excluding the case 102 and the cap 120 to form a unit, covering the bobbin 108 with the foam 122, and then inserting the unit into the case 102. To do. That is, the foam 122 is formed around the wound body 104 before being inserted into the case 102, and when the unit is inserted into the case 102, the foam 122 receives a load from the inner wall of the case 102. In addition, it is in a compressed state.
- the antenna coil 100 is dropped horizontally on the concrete, and the relationship between the compressibility of the foam 122 and the probability that the magnetic core 106 is damaged is measured.
- foam 122 urethane foam manufactured by Inoac Co., Ltd. having a hardness of 100 N and a thickness of 3.0 mm under no load is used.
- the height hi inside the case 102 is fixed to 5.1 mm, and the thickness of the magnetic core 106 and the height h2 outside the bobbin 108 are changed. Therefore, the gap between the case 102 and the bobbin 108, that is, the thickness h3 of the foam 122 after compression, is defined by the thickness of the magnetic core 106 and the height h2 outside the bobbin 108. Can be changed.
- the antenna coil 100 was dropped from a height of lm, and the probability that the magnetic core 106 was damaged was measured.
- FIG. 3 is a graph showing the relationship between the compression ratio of the foam and the breakage ratio of the magnetic core found from Experiment 1.
- the damage ratio of the magnetic core was 0% in the range where the compression ratio of the foam was 45 to 65%.
- the compression ratio was less than 45% or more than 65%, the magnetic core breakage occurred with a significant probability.
- the foam 122 is compressed by a thickness of 45 to 65% with respect to the thickness under no load, and the case is compressed.
- the foam 122 having good responsiveness to impact and load can be realized by inserting it into the coil 102, and the magnetic core 106 can be prevented from being damaged even if the antenna coil 100 is subjected to impact or load. be able to.
- Fig. 4 is a graph showing the relationship between the compression ratio and the load applied to the foam. As is apparent from FIG. 4, when the foam 122 is compressed by 45 to 65%, a certain load is applied to the foam.
- the compression ratio of the foam 122 is less than 45% or exceeds 65%, the ability to absorb the impact is reduced. If the foam 122 is compressed so that the compression ratio is 45 to 65%, the foam 122 is expanded. A constant load is applied to the body 122, and the ability to absorb instantaneous impact is optimized. Therefore, the magnetic core 106 can be prevented from being damaged in the antenna coil 100.
- Fig. 5 is a graph showing the results of Experiment 2, in which the most damaged height of the four samples shows the low strength, the damaged height of the four samples, and the average damaged height of the four samples.
- the compression ratio of the foam 122 By defining the compression ratio of the foam 122 to 57 to 64%, the shock absorption capacity And the magnetic core 106 of the antenna coil 100 is damaged. If the compression ratio of the foam 122 is regulated to 59 to 62%, the impact resistance of the antenna coil 100 is further enhanced.
- the cap 120 is fitted into the opening of the case 102.
- the force is such that the wound body 104 is held in the center of the case 102.
- the present invention is not limited to this embodiment.
- the wound body 104 is covered with the foam body 122, so that the impact applied to the case 102 is applied to the wound body 104 and magnetic.
- the body core 106 is not damaged.
- the bobbin 108 and the cap 120 constituting the wound body 104 may be integrally formed. This makes it easier to hold the wound body 104 at the center of the case 102 just by further simplifying the manufacture of the antenna coil 100. Therefore, a structure in which an impact applied to the case 102 is less likely to be transmitted to the magnetic core 106 can be realized more easily.
- FIG. 6 is a plan view showing the structure of the antenna coil according to the second embodiment.
- symbol is attached
- a characteristic of the antenna coil 200 according to the second embodiment is that a gel body 230 is provided between the foam body 222 and the case 102, and the foam body 222 is covered with the gel body 230.
- the gel body 230 is made of a silicone resin, and a sol-like silicone resin (gel body 230 before curing) is injected into the case 102 in advance, and the wound body 104 with the foam 222 attached thereto is inserted. Thereafter, heat treatment (100 ° C., 1 hour) is performed to cure the silicone resin into a gel. Further, in this embodiment, the foam 222 and the gel body 230 are supported by the cap 120 of the wound body 104 and are formed so as to cover the end! /.
- the gel body 230 is preferably formed only in a part of the gap between the foam 222 and the case 102! /. This is because if the gel body 230 is filled without a gap, the fluidity of the gel body 230 is impaired, and the absorption performance of the gel body 230 with respect to impact is deteriorated.
- the gel body 230 can be obtained by using force S, in addition to silicone resin, epoxy resin or urethane resin.
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- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Details Of Aerials (AREA)
- Coils Or Transformers For Communication (AREA)
- Support Of Aerials (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008549246A JP5003688B2 (ja) | 2006-12-14 | 2007-12-03 | アンテナコイル |
CN200780045974XA CN101558529B (zh) | 2006-12-14 | 2007-12-03 | 天线线圈 |
US12/481,700 US8358250B2 (en) | 2006-12-14 | 2009-06-10 | Antenna coil |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006336965 | 2006-12-14 | ||
JP2006-336965 | 2006-12-14 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/481,700 Continuation US8358250B2 (en) | 2006-12-14 | 2009-06-10 | Antenna coil |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2008072496A1 true WO2008072496A1 (ja) | 2008-06-19 |
Family
ID=39511518
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/073301 WO2008072496A1 (ja) | 2006-12-14 | 2007-12-03 | アンテナコイル |
Country Status (5)
Country | Link |
---|---|
US (1) | US8358250B2 (ja) |
JP (1) | JP5003688B2 (ja) |
CN (1) | CN101558529B (ja) |
TW (1) | TWI449263B (ja) |
WO (1) | WO2008072496A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015107797A1 (ja) * | 2014-01-20 | 2015-07-23 | 株式会社村田製作所 | アンテナ部品 |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6186907B2 (ja) * | 2013-06-06 | 2017-08-30 | スミダコーポレーション株式会社 | アンテナ用コイル装置 |
JP6186924B2 (ja) * | 2013-06-19 | 2017-08-30 | スミダコーポレーション株式会社 | アンテナ用コイル装置およびコイルボビン |
US9768509B2 (en) | 2013-08-09 | 2017-09-19 | Sumida Corporation | Antenna coil component, antenna unit, and method of manufacturing the antenna coil component |
JP6280898B2 (ja) * | 2015-08-26 | 2018-02-14 | 株式会社東海理化電機製作所 | アンテナ装置 |
KR101754575B1 (ko) * | 2016-03-11 | 2017-07-10 | 인팩일렉스 주식회사 | 차량의 스마트키용 저주파 안테나 |
CN109196717B (zh) * | 2016-06-03 | 2020-12-08 | 株式会社村田制作所 | 线圈天线 |
CN111430922B (zh) * | 2020-04-20 | 2022-09-13 | 胜美达电机(香港)有限公司 | 天线设备及其制造方法 |
ES2940074T3 (es) * | 2020-05-26 | 2023-05-03 | Premo Sa | Antena de baja frecuencia de largo alcance |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH05331364A (ja) * | 1992-06-03 | 1993-12-14 | Bridgestone Corp | 衝撃吸収材 |
WO2007015344A1 (ja) * | 2005-08-04 | 2007-02-08 | Murata Manufacturing Co., Ltd. | コイルアンテナ |
Family Cites Families (13)
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---|---|---|---|---|
US3965474A (en) * | 1975-09-26 | 1976-06-22 | The United States Of America As Represented By The Secretary Of The Navy | Antenna for receiving VLF/LF transmission in seawater |
JPS59208902A (ja) * | 1983-05-12 | 1984-11-27 | Omron Tateisi Electronics Co | 2周波同調形アンテナ |
US5202696A (en) * | 1991-11-18 | 1993-04-13 | Sheriff Jack W | End fed half wave dipole antenna |
JP3855253B2 (ja) * | 2000-06-13 | 2006-12-06 | アイシン精機株式会社 | バーアンテナおよびその製造方法 |
US6618014B2 (en) * | 2001-09-28 | 2003-09-09 | Centurion Wireless Tech., Inc. | Integral antenna and radio system |
EP1461234B1 (en) * | 2001-10-01 | 2007-11-07 | Donnelly Corporation | Vehicle handle assembly with antenna |
US6741214B1 (en) * | 2002-11-06 | 2004-05-25 | Centurion Wireless Technologies, Inc. | Planar Inverted-F-Antenna (PIFA) having a slotted radiating element providing global cellular and GPS-bluetooth frequency response |
JP4428988B2 (ja) * | 2003-11-20 | 2010-03-10 | 株式会社アイ・ライティング・システム | 放電灯安定器 |
JP4378624B2 (ja) * | 2004-02-10 | 2009-12-09 | 株式会社イノアックコーポレーション | シール部材の製造方法 |
JP2005295473A (ja) * | 2004-04-06 | 2005-10-20 | Toko Inc | アンテナコイル |
US7145511B2 (en) * | 2004-10-05 | 2006-12-05 | Industrial Technology Research Institute | Apparatus of antenna with heat slug and its fabricating process |
JP2007043588A (ja) * | 2005-08-05 | 2007-02-15 | Murata Mfg Co Ltd | コイルアンテナ |
KR100790685B1 (ko) * | 2005-09-16 | 2008-01-02 | 삼성전기주식회사 | 무선통신 단말기의 내장형 안테나 모듈 |
-
2007
- 2007-11-05 TW TW096141640A patent/TWI449263B/zh active
- 2007-12-03 JP JP2008549246A patent/JP5003688B2/ja active Active
- 2007-12-03 WO PCT/JP2007/073301 patent/WO2008072496A1/ja active Application Filing
- 2007-12-03 CN CN200780045974XA patent/CN101558529B/zh active Active
-
2009
- 2009-06-10 US US12/481,700 patent/US8358250B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH05331364A (ja) * | 1992-06-03 | 1993-12-14 | Bridgestone Corp | 衝撃吸収材 |
WO2007015344A1 (ja) * | 2005-08-04 | 2007-02-08 | Murata Manufacturing Co., Ltd. | コイルアンテナ |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015107797A1 (ja) * | 2014-01-20 | 2015-07-23 | 株式会社村田製作所 | アンテナ部品 |
JP5892293B2 (ja) * | 2014-01-20 | 2016-03-23 | 株式会社村田製作所 | アンテナ部品 |
Also Published As
Publication number | Publication date |
---|---|
US20090243952A1 (en) | 2009-10-01 |
CN101558529A (zh) | 2009-10-14 |
CN101558529B (zh) | 2012-08-29 |
JPWO2008072496A1 (ja) | 2010-03-25 |
US8358250B2 (en) | 2013-01-22 |
TW200828678A (en) | 2008-07-01 |
JP5003688B2 (ja) | 2012-08-15 |
TWI449263B (zh) | 2014-08-11 |
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