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WO2008050541A1 - Dispositif d'antenne - Google Patents

Dispositif d'antenne Download PDF

Info

Publication number
WO2008050541A1
WO2008050541A1 PCT/JP2007/067031 JP2007067031W WO2008050541A1 WO 2008050541 A1 WO2008050541 A1 WO 2008050541A1 JP 2007067031 W JP2007067031 W JP 2007067031W WO 2008050541 A1 WO2008050541 A1 WO 2008050541A1
Authority
WO
WIPO (PCT)
Prior art keywords
case
conductive member
antenna device
heat
thermal conductivity
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2007/067031
Other languages
English (en)
Japanese (ja)
Inventor
Kenji Naito
Yoshihiro Sako
Takaaki Ooi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
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 WO2008050541A1 publication Critical patent/WO2008050541A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • H01Q1/002—Protection against seismic waves, thermal radiation or other disturbances, e.g. nuclear explosion; Arrangements for improving the power handling capability of an antenna
    • 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
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome

Definitions

  • the present invention relates to an antenna device used in, for example, a short-range communication system in the LF band (long wave 30 kHz to 300 kHz).
  • An antenna device in a keyless entry system constitutes the antenna device.
  • Patent Document 1 discloses an antenna device incorporating a plurality of circuit components!
  • FIG. 1 is a diagram showing the structure of the antenna device.
  • the case body 31 is integrally formed with a housing part 41 for housing the antenna 22 and the printed circuit board 23 and a connector part 42 to which the vehicle side connector C is connected.
  • the antenna 22 is a so-called bar antenna including a bobbin 54 fixed in a state where a magnetic core 53 formed of a magnetic material such as ferrite is passed through a square bar and a coil 55 attached to the bobbin 54.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2006-180436
  • Patent Document 1 in an antenna device in which a plurality of circuit components are built in a cylindrical case having one end opened and the other end closed, the circuit components in the case In the case where the heater element is included, the heat generated from the heater element may cause stress or damage to other circuit components.
  • an object of the present invention is to provide an antenna device in which a manufacturing process is simplified by reducing the number of parts constituting the antenna device, and a reduction in reliability due to heat of an internal heating element is suppressed. There is.
  • the present invention provides an antenna device comprising a plurality of circuit components including a heating element, and a cylindrical case containing the circuit components and having one end opened and the other end closed.
  • the heat conductive member is provided, for example, near the opening of the case! This reduces the effect on circuit components other than the heating elements.
  • the thermally conductive member has, for example, a thermal conductivity higher than that of the case. As a result, the heat of the heating element can be efficiently conducted to the case surface, and the heat dissipation effect is enhanced.
  • the area of the portion where the thermally conductive member is in contact with the case is equal to or greater than the cross-sectional area X in the thickness direction of the case (thermal conductivity of the case / thermal conductivity of the thermally conductive member). To do. Thereby, the heat dissipation effect per quantity of the thermally conductive member provided in the case is enhanced.
  • thermally conductive member For example, a synthetic resin is used for the thermally conductive member. As a result, the adhesiveness of the thermally conductive member to the case is increased and the case is easily sealed. In addition, it is easy to place the thermally conductive material in the case.
  • the heat conductive member is, for example, cast resin injected from the opening of the case.
  • the adhesion between the heating element and the thermally conductive member and the adhesion between the case and the thermally conductive member are increased, and the thermal conductivity from the heating element to the case via the thermally conductive member is improved.
  • the case is, for example, a resin molded body.
  • the adhesion between the case and the thermally conductive member is enhanced, and the heat radiation cooling effect of the heat generating element is enhanced.
  • the case includes a support member that supports the circuit component in a state where the circuit component is not in contact with the case. As a result, it becomes difficult for the heat of the case to be transmitted to the circuit components, and the stress and damage due to the heat to the circuit components can be suppressed.
  • the heat generating element is housed in a case with a reduced number of parts.
  • Other circuit components are affected by the heat generated by the heat generating elements, and the characteristics are stable and the reliability is high!
  • FIG. 1 is a cross-sectional view showing a configuration of an antenna device shown in Patent Document 1.
  • FIG. 2 is a cross-sectional view showing the configuration of the antenna device according to the first embodiment.
  • FIG. 3 is a cross-sectional view showing a configuration of an antenna device according to a second embodiment.
  • FIG. 4 is a cross-sectional view showing a configuration of an antenna device according to a third embodiment.
  • FIG. 5 is a cross-sectional view showing a configuration of an antenna device according to a fourth embodiment.
  • FIG. 2 is a cross-sectional view showing the configuration of the antenna device according to the first embodiment.
  • the case 10 is a flat cylindrical case with one end (left side in the figure) opened and the other end (right side) closed.
  • the case 10 contains a coil 2, a capacitor 3 and a resistor 4 wound around a core 1.
  • a heat conductive member 11 is provided near the opening of the case 10, and the opening of the case 10 is sealed by the heat conductive member 11.
  • the heat conductive member 11 generates heat.
  • Resistor 4 is embedded. Further, the heat conductive member 11 supports the lead terminals 5 and 6 in the opening of the case 10.
  • a circuit consisting of a series circuit of a coil 2, a capacitor 3 and a resistor 4 wound around a core 1 functions as a coil antenna in the LF band.
  • the resonance frequency is determined by the inductance of coil 2 and the capacitance of capacitor 3, and the frequency band is determined by lowering the antenna Q to a predetermined value by resistor 4.
  • This antenna device is configured such that the lead terminal 5 to which the resistor 4 is connected, the other lead terminal 6, the capacitor 3, and the coil 2 are connected to the case 10 from the opening of the case 10.
  • the heat conductive member 11 is made of a castable epoxy resin.
  • Case 10 has PBT
  • ABS acrylic nitrile butadiene styrene copolymer
  • both the adhesion to the resistor 4 and the adhesion to the case 10 can be improved.
  • a pre-molded resin member is attached to the opening of the case 10 Compared with the case, the heat conduction efficiency can be increased.
  • the thermal conductivity of the thermal conductive member 11 is less than 0.3 W / m'K, the heat generating element (resistance 4) force and the thermal conduction efficiency to the case 10 are low. Increase the thermal conductivity by dispersing alumina, aluminum hydroxide, silica and compounds as additives in the resin.
  • the thermal conductivity of the heat conductive member 11 can be increased as the dispersion ratio of the additive is increased.
  • the thermal conductivity of the epoxy resin in which the additive and the additive are dispersed is 1.0 or more, the casting resin becomes too viscous and the casting operation becomes difficult. Therefore, as a range where heat release is high and injection work is easy, the additive is dispersed so that the thermal conductivity of the heat conductive member 11 is in the range of 0.3 W / m'K to; 1.03 W / mK. It is preferable to set the ratio.
  • the additive may be in the form of powder with a small diameter or granular with a large diameter. When using powdered additives, it is possible to cast with the additives dispersed in the resin in advance. On the other hand, when using a granular additive, the additive And then cast and harden so that the low-viscosity resin soaks into the additive. This makes it possible to form a heat conductive member that is easy to manufacture and has good heat conductivity.
  • the thermal conductivity of the thermal conductive member 11 is preferably equal to or higher than the thermal conductivity of the case 10.
  • the heat generated from the heating element is transferred from the heating element to the thermally conductive member 11 and further to the case 10, and the heat is quickly conducted to the case 10 and radiated from the surface of the case 10 having a large surface area. Can be made. Therefore, a high heat dissipation effect can be obtained.
  • a resin having a thermal conductivity of 100 to 300% of the thermal conductivity of the case 10 is used as the thermal conductive member 11.
  • the case 10 having a thermal conductivity higher than that of the thermal conductive member 11 can also be used.
  • the area of the portion where the thermal conductive member 11 is in contact with the inner surface of the case 10 is equal to or larger than the cross-sectional area X in the thickness direction of the case 10 (thermal conductivity of the case 10 / thermal conductivity of the thermal conductive member 11).
  • the cross-sectional area in the thickness direction of the case is the cross-sectional area of the thickness (annular portion) of the cylindrical case resin.
  • the heat resistance of the heat conductive member 11 and the case 10 can be brought close to each other in the path in which the heat of the heat generating element is conducted from the heat conductive member 11 to the surface of the case 10, and the heat dissipation is not reduced. An effect is obtained.
  • the thermal conductive member 11 is brought into contact with the area of about 500 mm 2 (about 12 times) with respect to the cross-sectional area of the case 10 of about 40 mm 2 .
  • the thermal resistance is sufficiently low.
  • the heat conductive member 11 it is not always necessary to dispose the heat conductive member 11 at the end portion of the case 10 at the end portion. However, by disposing the heat conductive member 11 at the end of the case 10, a gap can be provided between the heating element (resistor 4) and other circuit components (coil 2, capacitor 3). More preferable. Further, the heat conductive member 11 may be arranged by casting a resin or by inserting a pre-molded resin. In addition, not only the structure in which the entire resistor 4 as the heating element is embedded in the heat conductive member 11 but also a structure in which only a part is covered with the heat conductive member 11 is effective. is there.
  • the capacitor 3, the coil 2, and the case 10 are shown as floating, but they are not necessarily lifted.
  • Heat generated from the resistance is the case from the heat conductive member 11 Since the heat is transferred from the surface of the case 10 to the air and is radiated from the surface of the case 10 to the air, the temperature decreases as the distance from the heat conductive member 11 is increased.
  • the heat conducted to 2 is relatively small, so damage and stress due to heat are suppressed.
  • FIG. 3 is a cross-sectional view showing the configuration of the antenna device according to the second embodiment. Unlike the first embodiment shown in FIG. 2, it has a bobbin portion 8 around which the coil 2 is wound, a location where the capacitor 3 is installed, and a coil connection terminal 9, which are integrated into the case as a unit.
  • an internal unit consisting of the coil 2, capacitor 3, coil connection terminal 9, resistor 4, lead terminals 5, 6, and core 1 together with the bobbin portion 8 and lid portion 7 is inserted into the case 10.
  • the heat conductive member 11 is cast into the space from the opening of the case 10 to the lid 7.
  • the lid 7 prevents the heat conductive member 11 from being poured into the case.
  • the gap between the lid portion 7 and the case 10 is preferably in close contact with a rubber resin or the like. As a result, the inside of the lid portion 7 is kept hollow, and even when bending stress is applied to the entire antenna device from the outside, the stress is not applied to the core 1 and the capacitor 3 and the destructive force can be protected.
  • FIG. 4 is a cross-sectional view showing the configuration of the antenna device according to the third embodiment.
  • foam was provided in the gap created by floating the circuit components inside the case from the case. Is. That is, by using a resin molded body having the bobbin portion 8 and the lid portion 7 as a body, the coil 1 and the coil 2 are lifted from the inner surface of the case 10 to generate a space portion.
  • foam made of foamed urethane or foamed silicone is a sponge that contains air, so heat from the case 10 is difficult to conduct to the internal circuit components.
  • the foam 13 absorbs deformation and load applied to the bobbin portion 8 more quickly, the impact resistance of the core 1 accommodated in the bobbin portion 8 is improved.
  • An example of the manufacturing process of the antenna device shown in FIG. 4 is as follows.
  • the terminal 15b soldered or welded to the capacitor 3 is connected to the inner terminal of the resistor 4, and the coil connection terminal 9 and the lead terminal 6 are connected by wires.
  • the terminal 15b of the capacitor 3 and the internal terminal of the resistor 4 are connected by a wire, but they may be directly connected. Further, the end of the coil 2 may be directly connected to the lead terminal 6 without using the coil connection terminal 9.
  • FIG. 5 is a cross-sectional view showing the configuration of the antenna device according to the fourth embodiment. What is different from the first embodiment shown in FIG. 2 is the arrangement of the heat conductive members. In the example shown in FIG. 5, it is only necessary to dispose the heat conductive member 11 in the opening of the case 10. A further heat conductive member 12 is arranged inside the case via an air layer 14.
  • the antenna device is configured by a circuit composed of L, C, and R.
  • all of these circuit components may not be included.
  • the circuit components may be included.
  • a capacitor may be treated as a heating element and embedded in a thermally conductive member. Further, when a plurality of heating elements are provided, it is preferable that all of them are embedded in the heat conductive member, but even if at least one of them is embedded, there is an effect of suppressing the temperature rise.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Details Of Aerials (AREA)

Abstract

L'invention concerne un dispositif d'antenne dont la taille est réduite en diminuant le nombre de composants et pour lequel il est possible de supprimer la diminution de la fiabilité due à la chaleur d'un élément interne thermogène. L'invention présente de façon spécifique un dispositif d'antenne dans lequel des composants de circuit tels qu'une résistance (4), qui est un élément thermogène, un condensateur (3) et une bobine (2) sont contenus dans un boîtier cylindrique (10), qui est ouvert à une extrémité et fermé à l'autre extrémité, ainsi qu'une unité de couvercle (7) et une unité de bobine (8). Un élément thermo-conducteur (11) ayant une conductivité thermique élevée est coulé dans le boîtier (10) de manière à sceller hermétiquement l'ouverture du boîtier (10) tout en fixant la résistance (4).
PCT/JP2007/067031 2006-10-27 2007-08-31 Dispositif d'antenne Ceased WO2008050541A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006293135 2006-10-27
JP2006-293135 2006-10-27

Publications (1)

Publication Number Publication Date
WO2008050541A1 true WO2008050541A1 (fr) 2008-05-02

Family

ID=39324351

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2007/067031 Ceased WO2008050541A1 (fr) 2006-10-27 2007-08-31 Dispositif d'antenne

Country Status (1)

Country Link
WO (1) WO2008050541A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009278274A (ja) * 2008-05-13 2009-11-26 Sumida Corporation アンテナ装置
JP2012204959A (ja) * 2011-03-24 2012-10-22 Aisin Seiki Co Ltd 車載用アンテナ装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11214209A (ja) * 1998-01-20 1999-08-06 Toshiba Corp 非接触データキャリア用アンテナ磁芯、非接触データキャリアパッケージ、および非接触データキャリアシステム
JP2004517503A (ja) * 2001-01-11 2004-06-10 エムプレサ ブラジレイラ デ コムプレッソレス ソシエダッド アノニマ − エムブラコ 電子装置
JP2005295473A (ja) * 2004-04-06 2005-10-20 Toko Inc アンテナコイル
JP2005304001A (ja) * 2004-03-15 2005-10-27 Nippon Hoso Kyokai <Nhk> バーアンテナ及び電波中継装置
JP2006041353A (ja) * 2004-07-29 2006-02-09 Toyota Motor Corp リアクトルの放熱構造
JP2006066470A (ja) * 2004-08-24 2006-03-09 Tdk Corp コイル装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11214209A (ja) * 1998-01-20 1999-08-06 Toshiba Corp 非接触データキャリア用アンテナ磁芯、非接触データキャリアパッケージ、および非接触データキャリアシステム
JP2004517503A (ja) * 2001-01-11 2004-06-10 エムプレサ ブラジレイラ デ コムプレッソレス ソシエダッド アノニマ − エムブラコ 電子装置
JP2005304001A (ja) * 2004-03-15 2005-10-27 Nippon Hoso Kyokai <Nhk> バーアンテナ及び電波中継装置
JP2005295473A (ja) * 2004-04-06 2005-10-20 Toko Inc アンテナコイル
JP2006041353A (ja) * 2004-07-29 2006-02-09 Toyota Motor Corp リアクトルの放熱構造
JP2006066470A (ja) * 2004-08-24 2006-03-09 Tdk Corp コイル装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009278274A (ja) * 2008-05-13 2009-11-26 Sumida Corporation アンテナ装置
JP2012204959A (ja) * 2011-03-24 2012-10-22 Aisin Seiki Co Ltd 車載用アンテナ装置

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