JP2005340342A

JP2005340342A - Coil device

Info

Publication number: JP2005340342A
Application number: JP2004154540A
Authority: JP
Inventors: Yoshiaki Akachi; 義昭赤地; Takahiro Kajiyama; 隆啓梶山
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-05-25
Filing date: 2004-05-25
Publication date: 2005-12-08
Also published as: CN100341080C; CN1702784A; TW200539198A; TWI254325B

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil device high in terminal bonding strength and excellent in heat radiation performance. <P>SOLUTION: A core 1 includes a winding part 10, a base junction face 13, and a terminal junction face 14; and a coil 2 is wound around the winding part 10. The base 3 comprises synthetic resin, and includes a core junction 31 and a terminal coupling part 32. A terminal 4 consists of a metal plate, and includes a core junction 44 and a coil connection 451, and is coupled with the base 3 via a terminal coupling part 32 formed on the base 3. The core junction 31 formed on the base 3 and the core junction 44 formed at the terminal 4 are respectively face-contacted with and bonded to the base junction face 13 of the core 1 and the terminal junction face 14 of the core 1. The coil 2 is connected to the coil connection 451 formed at the terminal 4. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、表面実装型の小型、低背型インダクタやトランス等に用いて好適なコイル装置に関する。 The present invention relates to a coil device suitable for use in a surface mount type small, low profile inductor, transformer or the like.

近年、電子機器の小型化、薄型化が進展し、これらの機器に搭載される部品に対しても、限りなく小型、低背化が要求されている。電子機器の回路基板に搭載されるインダクタやトランス等のコイル装置は、従来から、外部接続端子を植設した合成樹脂製の基台上に、巻き線を施したコアを組み合わせて構成していたが、耐圧規定のないコイル装置においては、小型化、低背化の要求に対処する方法として、接着材を用いてコアに直接金属端子を接着する方式が主流となりつつある。 In recent years, electronic devices have been reduced in size and thickness, and parts mounted on these devices are required to be infinitely small and low in profile. Conventionally, coil devices such as inductors and transformers mounted on circuit boards of electronic devices have been configured by combining a wound core on a synthetic resin base on which external connection terminals are implanted. However, in a coil device without a withstand voltage regulation, a method of directly bonding a metal terminal to a core using an adhesive is becoming the mainstream as a method for coping with the demand for a reduction in size and height.

しかし、接着剤を用いてコアに直接金属端子を接着したとき、コアがフェライト等の焼結体であると、高い接着強度を得ることが困難であった。すなわち、一般的に金属端子は、リン青銅や銅合金、鉄等の金属材料が用いられ、端子の腐食防止や、はんだ濡れ性を確保するために、表面に金、銀あるいは錫等のめっきが施される。めっきが施された端子は、表面の平滑度が高く、この平滑度の高さが金属端子の接着強度を低下させる。更に、錫めっきやはんだめっき等のめっき層が形成された金属端子にあっては、はんだ付け時の熱が、めっき層の軟化や溶融を引き起こすため、接着剤面も軟化し、結果として、金属端子の接着強度を更に低下させる。この問題は、近年の鉛フリー化によるはんだ付け温度の上昇にともない、極めて大きな問題となりつつある。このため、コアと金属端子との接着強度を向上させるための種々の提案がなされている。 However, when the metal terminal is directly bonded to the core using an adhesive, it is difficult to obtain high adhesive strength when the core is a sintered body such as ferrite. In other words, metal terminals such as phosphor bronze, copper alloys, and iron are generally used for metal terminals, and the surface is plated with gold, silver, tin, or the like to prevent terminal corrosion and ensure solder wettability. Applied. The plated terminal has a high surface smoothness, and the high smoothness reduces the adhesive strength of the metal terminal. Furthermore, for metal terminals with a plating layer such as tin plating or solder plating, the heat during soldering causes the plating layer to soften or melt, so the adhesive surface also softens. Further reduce the adhesive strength of the terminal. This problem is becoming a very large problem as the soldering temperature increases due to the recent lead-free process. For this reason, various proposals for improving the adhesive strength between the core and the metal terminal have been made.

例えば、特許文献１は、コアの端子との接着面に凹部を形成し、凹部に対応した端子に接着剤挿通手段を設け、端子の両面を利用した接着を可能とし、コアと端子とを強固に固定する技術を開示している。特許文献２は、接着部分の端子面に、星打ち状の凹凸部やコアの底面に配した溝などによる表面積増加手段を形成し、半田熱等によってもコアと端子とが剥がれないようにする技術を開示している。特許文献３は、半田付着可能層（厚さ１〜２０μｍの錫めっきや半田めっき）が被着された外部端子を備えたリードフレームのコア載置部の上面に半田付着防止層を設けて接着強度を向上する技術を開示している。特許文献４は、金属端子に、コア受け部の周縁から立ち上がった凸縁を備え、コア受け部及び凸縁をコアに接着して接着強度を大きくする技術を開示している。 For example, in Patent Document 1, a concave portion is formed on the bonding surface of the core with the terminal, and an adhesive insertion means is provided on the terminal corresponding to the concave portion, enabling bonding using both surfaces of the terminal, and the core and the terminal are firmly bonded. The technique to fix to is disclosed. In Patent Document 2, surface area increasing means is formed on the terminal surface of the bonded portion by means of a star-like uneven portion or a groove disposed on the bottom surface of the core so that the core and the terminal are not peeled off even by soldering heat or the like. The technology is disclosed. In Patent Document 3, a solder adhesion preventing layer is provided on the upper surface of a core mounting portion of a lead frame provided with an external terminal to which a solder adherable layer (thin plating or solder plating having a thickness of 1 to 20 μm) is attached. A technique for improving strength is disclosed. Patent Document 4 discloses a technique in which a metal terminal is provided with a convex edge rising from the peripheral edge of a core receiving part, and the core receiving part and the convex edge are bonded to the core to increase the adhesive strength.

しかし、上述した技術は、金属端子やコアの形状を加工して接着強度の向上を図るものであり、コストアップの要因になるという問題を有していた。しかも、フェライト等の焼結体で構成されたコアと、金属端子との相性に起因する本質的な接着強度の悪さを改善するものではなく、その接着強度の向上には限界があった。 However, the above-described technique has a problem in that the shape of the metal terminal or the core is processed to improve the adhesive strength, which causes a cost increase. In addition, it does not improve the inherent poor adhesive strength due to the compatibility between the core made of a sintered body such as ferrite and the metal terminal, and there is a limit to improving the adhesive strength.

また、部品の小型、薄型化の進展は、コイル装置の放熱の面でも問題を生じさせる。すなわち、発熱量の同じ部品を単純に小型化した場合、外周面積も当然小さくなるので、放熱性が低下する。従って、コイル装置の設計にあたり、発熱の抑制や放熱性の向上に配慮する必要が生じる。
特開平１０−３０３０３４号公報特開平１１−８１３３号公報特開平１１−２８３８４７号公報特開２００３−３４７１３１号公報 In addition, the progress of miniaturization and thinning of parts causes problems in terms of heat dissipation of the coil device. That is, when the parts having the same calorific value are simply reduced in size, the outer peripheral area is naturally reduced, so that the heat dissipation is reduced. Therefore, in designing the coil device, it is necessary to consider the suppression of heat generation and the improvement of heat dissipation.
JP-A-10-303034 Japanese Patent Laid-Open No. 11-8133 JP-A-11-283847 JP 2003-347131 A

本発明の課題は、コアと金属端子とを接着する際の接着強度の悪さを改善し、コイル装置全体として端子接着強度の向上を図ったコイル装置を提供することである。 The subject of this invention is providing the coil apparatus which improved the bad adhesive strength at the time of adhere | attaching a core and a metal terminal, and aimed at the improvement of terminal adhesive strength as the whole coil apparatus.

本発明のもう一つの課題は、放熱性能の優れたコイル装置を提供することである。 Another object of the present invention is to provide a coil device having excellent heat dissipation performance.

上述した課題を解決するため、本発明に係るコイル装置は、コアと、コイルと、基台と、端子とを含む。前記コアは、巻線部と、基台接合面と、端子接合面とを含み、前記巻線部にコイルが巻回されている。前記基台は、合成樹脂で構成されており、コア接合部と、端子結合部とを含む。前記端子は、金属板で構成されており、コア接合部と、コイル接続部とを含み、前記基台に形成された前記端子結合部を介して前記基台と結合している。前記基台に形成されたコア接合部及び前記端子に形成されたコア接合部は、前記コアの前記基台接合面及び前記コアの端子接合面にそれぞれ面接触して接着している。前記コイルは、前記端子に形成された前記コイル接続部に接続している。 In order to solve the above-described problem, the coil device according to the present invention includes a core, a coil, a base, and a terminal. The core includes a winding part, a base joining surface, and a terminal joining surface, and a coil is wound around the winding part. The said base is comprised with the synthetic resin and contains a core junction part and a terminal coupling part. The said terminal is comprised with the metal plate, and is couple | bonded with the said base through the said terminal coupling part formed in the said base including a core junction part and a coil connection part. The core joint formed on the base and the core joint formed on the terminal are in surface contact with and bonded to the base joint surface of the core and the terminal joint surface of the core. The coil is connected to the coil connection portion formed on the terminal.

上述したコイル装置において、基台は、合成樹脂で構成されており、コア接合部と、端子結合部とを含む。合成樹脂は、接着剤によるコアとの接着に当たり、接着剤及び合成樹脂材料の選択の幅が広く、合成樹脂材料と接着剤との組み合わせを適切に選択することにより、コアと金属との接着の場合と比較して、極めて大きな接着強度を得ることができる。 In the coil device described above, the base is made of a synthetic resin and includes a core joint portion and a terminal coupling portion. Synthetic resins have a wide range of choice of adhesives and synthetic resin materials for bonding to the core with adhesives, and by appropriately selecting the combination of synthetic resin materials and adhesives, Compared with the case, extremely large adhesive strength can be obtained.

端子は、金属板で構成されており、コア接合部と、コイル接続部とを含み、基台に形成された端子結合部を介して基台と結合している。基台に形成されたコア接合部及び端子に形成されたコア接合部は、コアの基台接合面及びコアの端子接合面にそれぞれ面接触して接着している。この構造により、端子に形成されたコア接合部は、コアに対して接着強度の低い金属製端子が、接着強度の高い合成樹脂製基台と結合して、基台に形成されたコア接合部とともにコアに接着するので、コイル装置全体として見ると、端子接着強度の高いコイル装置が得られる。 The terminal is made of a metal plate, includes a core joint portion and a coil connection portion, and is coupled to the base via a terminal coupling portion formed on the base. The core joint formed on the base and the core joint formed on the terminal are in surface contact with and bonded to the base joint surface of the core and the terminal joint surface of the core. With this structure, the core joint formed on the terminal is connected to the synthetic resin base having a high adhesive strength and the metal terminal having a low adhesive strength with respect to the core. At the same time, since it is bonded to the core, when viewed as the whole coil device, a coil device with high terminal adhesive strength can be obtained.

上述したコイル装置において、コイルは、端子に形成されたコイル接続部に接続している。端子は、コアの端子接合面に面接触して接着している。これらの構造は、コイル装置の放熱性能を向上する有益な手段となる。コイル装置で発生する熱は、コイルの銅損に起因する発熱及びコアの渦電流損や鉄損に起因する発熱等がある。これらはコアに面接触した端子を介して放熱されるとともに、コイルからコイル接続部及び端子を介しても放熱される。従って、コアに対する端子の接触面積、端子の断面積及び端子の表面積をコイル装置の発熱量を考慮して設定すれば、放熱性能の向上が図れる。 In the coil device described above, the coil is connected to a coil connection portion formed on the terminal. The terminals are bonded in surface contact with the terminal joint surface of the core. These structures are useful means for improving the heat dissipation performance of the coil device. The heat generated in the coil device includes heat generation due to coil copper loss and heat generation due to core eddy current loss and iron loss. These are dissipated through the terminals in surface contact with the core, and are also dissipated from the coil through the coil connecting portion and the terminals. Therefore, if the contact area of the terminal with respect to the core, the cross-sectional area of the terminal, and the surface area of the terminal are set in consideration of the heat generation amount of the coil device, the heat dissipation performance can be improved.

このように、本発明は、合成樹脂を介在させることにより、コアと金属端子とを接着する際の接着強度の悪さを改善し、コイル装置全体として端子接着強度が高く、放熱性能が優れているコイル装置を提供することができる。具体的な態様として、端子は、基台に形成された端子結合部と結合する部分に貫通孔を形成できる。この貫通孔に、基台を形成する端子結合部の合成樹脂を埋設すれば、端子と基台との結合がより強固となるので、コアと端子との接着強度を更に高めることができる。 Thus, the present invention improves the poor adhesive strength when bonding the core and the metal terminal by interposing the synthetic resin, and the coil device as a whole has high terminal adhesive strength and excellent heat dissipation performance. A coil device can be provided. As a specific aspect, the terminal can form a through-hole in the part couple | bonded with the terminal coupling part formed in the base. If the synthetic resin of the terminal coupling portion that forms the base is embedded in the through hole, the connection between the terminal and the base becomes stronger, so that the adhesive strength between the core and the terminal can be further increased.

端子に形成されたコア接合部のコアに対する面接触面積が大きいほど放熱性能が向上するが、あまり大きいと、基台に形成されたコア接合部のコアに対する面接触面積が小さくなり、また、隣接する端子間の間隔が狭くなる。端子間隔が狭くなると、端子製造時に用いるリードフレーム打ち抜き金型の寿命に悪影響を与え、更に、コイル装置を回路基板に実装する際に、はんだブリッジが発生し易くなり、絶縁不良を招くおそれがある。このため、隣接する端子間の間隔は、好ましくは０．５ｍｍ以上、更に好ましくは、１ｍｍ以上確保することが望ましい。 The heat dissipation performance improves as the surface contact area with the core of the core joint formed on the terminal increases, but if it is too large, the surface contact area with respect to the core of the core joint formed on the base becomes smaller and adjacent to the core. The interval between the terminals to be narrowed. When the terminal interval is narrow, the life of the lead frame punching die used for manufacturing the terminal is adversely affected, and when the coil device is mounted on the circuit board, a solder bridge is likely to occur, which may cause an insulation failure. . For this reason, it is preferable that the distance between adjacent terminals is preferably 0.5 mm or more, and more preferably 1 mm or more.

基台に形成されたコア接合部のコアに対する面接触面積が大きいほど端子接着強度が高くなる。このため、コアの基台接合面は、隣接する端子間の間隔内において、コアの相対抗する外縁から中心に向かって、それぞれ前記外縁間寸法の１／４以上の長さを有することが実用上好ましい。これらは、必要とされる端子接着強度及び放熱性能に応じて設定される。 The larger the surface contact area with respect to the core of the core joint formed on the base, the higher the terminal adhesive strength. For this reason, it is practical that the base joint surface of the core has a length of ¼ or more of the dimension between the outer edges from the outer edge opposed to the core toward the center within the interval between adjacent terminals. Above preferred. These are set according to the required terminal adhesive strength and heat dissipation performance.

本発明の他の目的、構成及び利点については、添付図面を参照し、更に詳しく説明する。但し、添付図面は、単なる例示に過ぎない。 Other objects, configurations and advantages of the present invention will be described in more detail with reference to the accompanying drawings. However, the attached drawings are merely examples.

以上述べたように、本発明によれば次のような効果を得ることができる。 As described above, according to the present invention, the following effects can be obtained.

（Ａ）コイル装置全体として端子接着強度の向上を図ったコイル装置を提供することができる。 (A) It is possible to provide a coil device in which the terminal adhesive strength is improved as a whole coil device.

（Ｂ）放熱性能の優れたコイル装置を提供することができる。 (B) A coil device having excellent heat dissipation performance can be provided.

図１は本発明に係るコイル装置の一実施例を示す斜視図、図２は、図１に図示したコイル装置の分解斜視図、図３は、図１に図示したコイル装置の使用状態の一例を示す断面図である。 FIG. 1 is a perspective view showing an embodiment of a coil device according to the present invention, FIG. 2 is an exploded perspective view of the coil device shown in FIG. 1, and FIG. 3 is an example of a use state of the coil device shown in FIG. FIG.

以下、図２を主体にして説明する。図示されたコイル装置は、コア１と、コイル２と、基台３と、一対の端子４とを含んで構成されている。 Hereinafter, description will be made with reference to FIG. The illustrated coil device includes a core 1, a coil 2, a base 3, and a pair of terminals 4.

コア１は、巻き線部１０と、基台接合面１３と、端子接合面１４とを含んでいればよく、コア１の大きさや形状等は特に限定されない。また、閉磁路型及び開磁路型のいずれのコアでもよく、複数のコアを組み合わせて一体化したコアでも用いことができる。一般的には、巻き線のし易さや、小型化に適していることから、ドラムコアが多用されている。コア１の材料は、端子４を接着剤で取り付けることから、絶縁性が高いほうが好ましい。本実施例では、フェライト等の焼結体で構成されたドラムコア１を用いている。本実施例のドラムコア１の大きさは、つば部１１、１２の直径がそれぞれ約６ｍｍ、巻き軸１５の軸方向長さが約１ｍｍ、コア１の巻き軸１５方向の外形寸法（図において高さ寸法）が約２ｍｍ程度である。巻き線部１０は、つば部１１、１２と巻き軸１５とで形成されるスペースに設けられる。基台接合面１３は、一方のつば部１１の端面の中央部に帯状に設けられるとともに、一方のつば部１１の側面１７の全周にわたって設けられる。端子接合面１４は、一方のつば部１１の端面の中央部に設けられた基台接合面１３の両側にそれぞれ対向して設けられる。 The core 1 should just contain the winding part 10, the base joint surface 13, and the terminal joint surface 14, and the magnitude | size, shape, etc. of the core 1 are not specifically limited. Moreover, any core of a closed magnetic circuit type and an open magnetic circuit type may be sufficient, and the core which combined and integrated the several core can also be used. Generally, a drum core is frequently used because it is easy to wind and is suitable for downsizing. Since the material of the core 1 attaches the terminal 4 with an adhesive, it is preferable that the material has a high insulating property. In this embodiment, the drum core 1 made of a sintered body such as ferrite is used. The size of the drum core 1 of this embodiment is such that the diameters of the flange portions 11 and 12 are about 6 mm, the axial length of the winding shaft 15 is about 1 mm, and the outer dimensions of the core 1 in the direction of the winding shaft 15 (height in the figure). Dimension) is about 2 mm. The winding portion 10 is provided in a space formed by the collar portions 11 and 12 and the winding shaft 15. The base joint surface 13 is provided in a band shape at the center of the end surface of the one flange portion 11 and is provided over the entire circumference of the side surface 17 of the one flange portion 11. The terminal joint surfaces 14 are provided to face both sides of the base joint surface 13 provided at the center of the end surface of the one flange portion 11.

基台３は、例えば液晶ポリマー等でなる耐熱性の合成樹脂で構成されており、コア接合部３１と、端子結合部３２とを含んでいる。コア接合部３１は、コア受け部３３と枠体３５とを含んで構成される。コア受け部３３は、一方のつば部１１の端面に設けられた基台接合面１３に接合するように、帯状に形成され、その長手方向の両端が枠体３５と連続している。枠体３５は、コア１の一方のつば部１１に形成された側面１７の全周に接合するように、環状に形成される。 The base 3 is made of a heat-resistant synthetic resin made of, for example, a liquid crystal polymer, and includes a core joint portion 31 and a terminal coupling portion 32. The core joint portion 31 includes a core receiving portion 33 and a frame body 35. The core receiving portion 33 is formed in a band shape so as to be joined to the base joining surface 13 provided on the end surface of one collar portion 11, and both ends in the longitudinal direction thereof are continuous with the frame body 35. The frame body 35 is formed in an annular shape so as to be joined to the entire circumference of the side surface 17 formed on one collar portion 11 of the core 1.

端子結合部３２は、端子４の板面に結合する部分と、端子４の端面に結合する部分とを含んでいる。端子４の板面に結合する部分は、端子４の外部接続端子部引き出し部板面と接合する外部端子結合部３６と、端子４のコイル接続端子部引き出し部板面と結合するコイル端子結合部３７と、端子４の鈎状折り曲げ部と結合する折り曲げ結合部３８とを含んでいる。それぞれの外部端子結合部３６には、それぞれ２個の円柱状の突起３６１が形成されている。端子４の端面に結合する部分は、枠体３５の内壁３５１、コア受け部３３の端面３３１、外部端子結合部３６の立ち上がり側壁３６２、コイル端子結合部３７の立ち上がり側壁３７１及び折り曲げ結合部３８の側壁等を含んでいる。 The terminal coupling portion 32 includes a portion coupled to the plate surface of the terminal 4 and a portion coupled to the end surface of the terminal 4. The portions that are coupled to the plate surface of the terminal 4 are the external terminal coupling portion 36 that is joined to the external connection terminal portion lead portion plate surface of the terminal 4, and the coil terminal coupling portion that is coupled to the coil connection terminal portion lead portion plate surface of the terminal 4. 37 and a bent coupling portion 38 coupled to the hook-shaped bent portion of the terminal 4. Two columnar projections 361 are formed on each external terminal coupling portion 36. The portions coupled to the end surface of the terminal 4 are the inner wall 351 of the frame 35, the end surface 331 of the core receiving portion 33, the rising sidewall 362 of the external terminal coupling portion 36, the rising sidewall 371 of the coil terminal coupling portion 37, and the bent coupling portion 38. Includes side walls and the like.

端子４は、互いに対向して配置された一対の金属端子でなり、それぞれ厚さ０．１５ｍｍ程度の銅板等の金属板にめっきを施し、プレス等で打ち抜くとともに折り曲げ加工を施し構成している。めっき工程は、金属板の打ち抜き工程、あるいは折り曲げ工程の後工程で行うこともできる。後工程で行えば、金属板の打ち抜き端面にもめっきが行える。また、打ち抜き工程の前工程でめっきを行えば、金属板の打ち抜き端面が露出するため、基台３との結合強度が向上する。端子４は、それぞれ、コア接合部４４と、コイル接続端子４５とを含み、更に、回路基板等の外部機器との接続のための外部接続端子部４６と、基台３との結合強度を増大させるための鈎状折り曲げ部４８とを含んでいる。コア接合部４４は、コア１の一方のつば部１１の端面に設けられた端子接合面１４に接合するように、半円弧状に形成された基部４７の一面に形成されている。コイル接続端子４５は、基部４７の円弧の一部分から引き出され、先端にコイル端末がからげられるコイル接続部４５１が形成されて、コイルの端末２５が接続される。外部接続端子部４６は、比較的広面積で基部４７から引き出されており、その引出し部に二つの貫通孔４６１を有している。鈎状折り曲げ部４８は、外部接続端子部４６から最も遠い円弧の先端部に形成されている。 The terminals 4 are a pair of metal terminals arranged opposite to each other, and are formed by plating a metal plate such as a copper plate having a thickness of about 0.15 mm, punching with a press or the like, and bending. The plating step can also be performed in a step after the metal plate punching step or the bending step. If it is performed in a later step, plating can be performed on the punched end surface of the metal plate. Further, if plating is performed in the pre-process of the punching process, the punched end face of the metal plate is exposed, so that the bond strength with the base 3 is improved. Each of the terminals 4 includes a core joint portion 44 and a coil connection terminal 45, and further increases the coupling strength between the external connection terminal portion 46 for connection to an external device such as a circuit board and the base 3. And a hook-like bent part 48 for causing the above. The core joint portion 44 is formed on one surface of a base portion 47 formed in a semicircular arc shape so as to be joined to the terminal joint surface 14 provided on the end face of one collar portion 11 of the core 1. The coil connection terminal 45 is pulled out from a part of the arc of the base 47, and a coil connection part 451 is formed at the tip of the coil connection terminal. The coil terminal 25 is connected to the coil connection terminal 45. The external connection terminal portion 46 is drawn out from the base 47 with a relatively large area, and has two through holes 461 in the lead-out portion. The hook-shaped bent portion 48 is formed at the tip of the arc farthest from the external connection terminal portion 46.

このように構成された端子４は、基台３に形成された端子結合部３２を介して基台３と結合している。具体的には、端子４は、リードフレームとして連続して形成され、インサート成形により基台３と一体的に結合して形成される。従って、図２において、基台３と、端子４とが分離して示されているが、結合に際して、これらが組み立てられて一体化される訳ではない。 The terminal 4 configured in this way is coupled to the base 3 via a terminal coupling portion 32 formed on the base 3. Specifically, the terminal 4 is continuously formed as a lead frame, and is integrally formed with the base 3 by insert molding. Therefore, although the base 3 and the terminal 4 are shown separately in FIG. 2, they are not assembled and integrated at the time of coupling.

基台３は、基台３と端子４とのインサート成形によって、端子接合部３２と、コア受け部３３と、枠体３５とが成形される。端子４は、その板面と端面とで基台３の端子結合部３２と結合する。 In the base 3, the terminal joint portion 32, the core receiving portion 33, and the frame body 35 are formed by insert molding of the base 3 and the terminal 4. The terminal 4 is coupled to the terminal coupling portion 32 of the base 3 at its plate surface and end surface.

端子４の基部４７は、その端面４４１が基台３のコア接合部３３の端面３３１に結合するとともに、枠体３５の内壁に結合して基台３と結合する。 The base portion 47 of the terminal 4 has an end surface 441 coupled to the end surface 331 of the core joint portion 33 of the base 3, and is coupled to the inner wall of the frame 35 to be coupled to the base 3.

基台３のコア受け部３３は、端子４の板厚と同じ厚さの０．１５ｍｍ程度に成形され、それぞれの端面同士が接合するので、端子４の基部４７と基台３のコア受け部３３とは、それぞれその両面が同一平面上に形成される。 The core receiving portion 33 of the base 3 is formed to a thickness of about 0.15 mm, which is the same as the plate thickness of the terminal 4, and the respective end faces are joined to each other, so the base 47 of the terminal 4 and the core receiving portion of the base 3 33, both surfaces are formed on the same plane.

端子４の外部接続端子部４６の引出し部に形成された二つの貫通孔４６１には、基台３の合成樹脂が埋設し、結果として円柱状の樹脂３６１が形成される。外部接続端子部４６の引出し部の板面は外部端子結合部３６と結合して基台３と結合する。外部接続端子部４６の引出し部の端面及び二つの貫通孔４６１の内周端面は、それぞれ、外部端子結合部３６の立ち上がり側壁３６２及び円柱状の樹脂３６１の外周側面と結合して基台３と結合する。二つの貫通孔４６１と、円柱状の樹脂３６１との結合構造は、基台３と、端子４との結合強度を増加させる。 The synthetic resin of the base 3 is embedded in the two through holes 461 formed in the lead-out portion of the external connection terminal portion 46 of the terminal 4, and as a result, a columnar resin 361 is formed. The plate surface of the lead-out portion of the external connection terminal portion 46 is coupled to the external terminal coupling portion 36 and coupled to the base 3. The end face of the lead-out part of the external connection terminal part 46 and the inner peripheral end face of the two through holes 461 are connected to the rising side wall 362 of the external terminal coupling part 36 and the outer peripheral side face of the columnar resin 361, respectively. Join. The coupling structure between the two through holes 461 and the columnar resin 361 increases the coupling strength between the base 3 and the terminal 4.

コイル接続端子部４５の板面は、コイル端子接合部３７と結合して基台３と結合する。コイル接続端子部４５の端面は、コイル端子接合部３７の立ち上がり側壁３７１と結合して基台３と結合する。 The plate surface of the coil connection terminal portion 45 is coupled to the coil terminal joint portion 37 and coupled to the base 3. The end surface of the coil connection terminal portion 45 is coupled to the rising side wall 371 of the coil terminal joint portion 37 and coupled to the base 3.

鈎状折り曲げ部４８は、基台３の奥深くに入り込み、折り曲げ接合部３８と結合する。この結合構造もまた、基台３と端子４との結合強度を増加させる。 The hook-shaped bent portion 48 penetrates deep into the base 3 and is coupled to the bent joint portion 38. This coupling structure also increases the coupling strength between the base 3 and the terminal 4.

このように結合して形成された基台３及び端子４は、上述したように、基台３のコア受け部３３と、端子４のコア接合部４４とがそれぞれ同一平面上に形成されているので、コア受け部３３のコア接合部３１と、基部４７のコア接合部４４とを、コア４の一面に面接触して接着し、コア４と一体化することができる。 As described above, the base 3 and the terminal 4 formed by coupling in this way have the core receiving portion 33 of the base 3 and the core joint portion 44 of the terminal 4 formed on the same plane. Therefore, the core joint portion 31 of the core receiving portion 33 and the core joint portion 44 of the base portion 47 can be brought into surface contact with and bonded to one surface of the core 4 so as to be integrated with the core 4.

具体的には、基台３のコア受け部３３は、コア４の一方のつば部１１の端面に形成された基台接合面１３に接着剤５（図３参照）を用いて接着される。基台３の枠部３５は、コア４の一方のつば部１１に形成された側面の全周に接着剤５を用いて接着される。端子４のコア接合部４４は、コア４の一方のつば部１１の端面に形成された端子接合面１４に接着剤５を用いて接着される。接着剤５は、例えばエポキシ系の耐熱性に優れた接着剤が用いられる。 Specifically, the core receiving portion 33 of the base 3 is bonded to the base joint surface 13 formed on the end surface of one collar portion 11 of the core 4 using the adhesive 5 (see FIG. 3). The frame portion 35 of the base 3 is bonded using the adhesive 5 to the entire circumference of the side surface formed on the one flange portion 11 of the core 4. The core joint portion 44 of the terminal 4 is bonded to the terminal joint surface 14 formed on the end surface of one collar portion 11 of the core 4 using the adhesive 5. As the adhesive 5, for example, an epoxy-based adhesive having excellent heat resistance is used.

コイル２は、コア１の巻き線部１０に巻回される。巻回されたコイル２の端末２５はコイル接続部４５１にからげられ、はんだ付けや溶接等の手段でコイル接続端子部４５に接続される。コイル２は、あらかじめ、コア１の巻き線部１０に巻回しておき、コイル２が巻回されたコア１を基台３及び端子４に接着しても良いが、本実施例のコイル装置では、コア１を基台３及び端子４に接着した後であっても、基台３の枠部３５がつば部１１の側面と略同一寸法に設定されているため、コア１の巻き線部１０が外部に露出しており、容易にコイル２の巻回が行える。 The coil 2 is wound around the winding portion 10 of the core 1. The terminal 25 of the wound coil 2 is wound around the coil connection part 451 and connected to the coil connection terminal part 45 by means such as soldering or welding. The coil 2 may be wound around the winding portion 10 of the core 1 in advance, and the core 1 around which the coil 2 is wound may be bonded to the base 3 and the terminal 4, but in the coil device of this embodiment, Even after the core 1 is bonded to the base 3 and the terminal 4, the frame portion 35 of the base 3 is set to have substantially the same dimension as the side surface of the collar portion 11, and thus the winding portion 10 of the core 1. Is exposed to the outside and the coil 2 can be easily wound.

上述したコイル装置において、基台３は、合成樹脂で構成されており、コア接合部３１と、端子結合部３２とを含む。合成樹脂は、接着剤５を用いてコア１と接着されたとき、コア１と金属との接着の場合と比較して、極めて大きな接着強度を得ることができる。 In the coil device described above, the base 3 is made of a synthetic resin and includes a core joint portion 31 and a terminal coupling portion 32. When the synthetic resin is bonded to the core 1 using the adhesive 5, it can obtain an extremely large adhesive strength as compared with the case where the core 1 is bonded to the metal.

端子４は、金属板で構成されており、コア接合部４４と、コイル接続部４５１とを含み、基台３に形成された端子結合部３２を介して基台３と結合している。基台３に形成されたコア接合部３１及び端子４に形成されたコア接合部４４は、コア１の基台接合面１３及びコア１の端子接合面１４にそれぞれ面接触して接着している。 The terminal 4 is made of a metal plate, includes a core joint portion 44 and a coil connection portion 451, and is coupled to the base 3 via a terminal coupling portion 32 formed on the base 3. The core joint portion 31 formed on the base 3 and the core joint portion 44 formed on the terminal 4 are in surface contact with and bonded to the base joint surface 13 of the core 1 and the terminal joint surface 14 of the core 1, respectively. .

この構造により、端子４に形成されたコア接合部４４は、コア１に対して接着強度の低い金属製端子４が、接着強度の高い合成樹脂製基台３と結合して、基台３に形成されたコア接合部３１とともにコア１に接着するので、コイル装置全体として見ると、端子接着強度の高いコイル装置が得られる。 With this structure, the core joint portion 44 formed on the terminal 4 is connected to the base 3 by connecting the metal terminal 4 having low adhesive strength to the core 1 to the synthetic resin base 3 having high adhesive strength. Since it adhere | attaches on the core 1 with the formed core junction part 31, when it sees as the whole coil apparatus, a coil apparatus with high terminal adhesive strength is obtained.

上述したコイル装置において、コイル２は、端子４に形成されたコイル接続部４５１に接続している。端子４は、コア１の端子接合面１４に面接触して接着している。従って、コイル装置で発生する熱は、コア１に面接触した端子４を介して放熱されるとともに、コイル２からコイル接続部４５１及び端子４の外部接続端子部４６を介しても放熱される。従って、コア１に対する端子４の接触面積、端子４の断面積及び端子４の表面積をコイル装置の発熱量を考慮して設定すれば、放熱性能の向上が図れる。 In the coil device described above, the coil 2 is connected to the coil connection portion 451 formed on the terminal 4. The terminal 4 is in surface contact with and bonded to the terminal joint surface 14 of the core 1. Therefore, the heat generated in the coil device is radiated through the terminal 4 in surface contact with the core 1 and is also radiated from the coil 2 through the coil connection portion 451 and the external connection terminal portion 46 of the terminal 4. Therefore, if the contact area of the terminal 4 with respect to the core 1, the cross-sectional area of the terminal 4, and the surface area of the terminal 4 are set in consideration of the amount of heat generated by the coil device, the heat dissipation performance can be improved.

端子４に形成されたコア接合部４４のコア１に対する面接触面積が大きいほど放熱性能が向上するが、あまり大きいと、基台３に形成されたコア接合部３１のコア１に対する面接触面積が小さくなり、また、隣接する端子４のコア接合部４４間の間隔が狭くなる。端子間隔が狭くなると、端子製造時に用いるリードフレーム打ち抜き金型の寿命に悪影響を与え、更に、コイル装置を回路基板に実装する際に、はんだブリッジが発生し易くなり、絶縁不良を招くおそれがある。このため、本実施例において、隣接する端子４のコア接合部４４間の間隔は、約１ｍｍに設定されている。 The larger the surface contact area of the core joint portion 44 formed on the terminal 4 with respect to the core 1, the better the heat dissipation performance. However, if the surface contact area is too large, the surface contact area of the core joint portion 31 formed on the base 3 with respect to the core 1 is increased. In addition, the distance between the core joints 44 of the adjacent terminals 4 is reduced. When the terminal interval is narrow, the life of the lead frame punching die used for manufacturing the terminal is adversely affected, and when the coil device is mounted on the circuit board, a solder bridge is likely to occur, which may cause an insulation failure. . For this reason, in the present embodiment, the interval between the core joints 44 of the adjacent terminals 4 is set to about 1 mm.

基台３に形成されたコア接合部３１のコア１に対する面接触面積が大きいほど端子接着強度が高くなる。このため、本実施例において、コア１の基台接合面１３は、コア１の隣接する端子接合面１４間において、コア１の相対抗する外周縁間の全面にわたって形成されている。 The larger the surface contact area with respect to the core 1 of the core joint portion 31 formed on the base 3, the higher the terminal adhesive strength. For this reason, in this embodiment, the base joint surface 13 of the core 1 is formed over the entire surface between the outer peripheral edges of the core 1 that oppose each other between the adjacent terminal joint surfaces 14 of the core 1.

このように、本発明は、合成樹脂を介在させることにより、コアと金属端子とを接着する際の接着強度の悪さを改善し、コイル装置全体として端子接着強度が高く、放熱性能が優れているコイル装置を提供することができる。 Thus, the present invention improves the poor adhesive strength when bonding the core and the metal terminal by interposing the synthetic resin, and the coil device as a whole has high terminal adhesive strength and excellent heat dissipation performance. A coil device can be provided.

本実施例のコイル装置は、図３に図示したように、回路基板６に設けた切り欠き６２にコア１を挿入し、端子４を回路パターン６４にはんだ６７で接続することにより回路基板６に実装することができる。このような実装形態は、回路基板６上の部品高さを低くできる利点があるが、コイル装置に矢印Ａ方向の外力が加わった場合、回路基板６が切り欠かれているため、回路基板６の剛性で外力を阻止することができない。このため、コア１と端子４との接着を引き剥がす方向に大きな外力が加わることになるが、本実施例のコイル装置は、コア１のつば部１１の側面１７に環状の枠体３５が接着しているため、枠体３５の剛性で外力に抗することができ、端子４の剥離が発生しにくいという効果も有している。 As shown in FIG. 3, the coil device according to the present embodiment inserts the core 1 into a notch 62 provided on the circuit board 6 and connects the terminals 4 to the circuit pattern 64 with solder 67. Can be implemented. Such a mounting form has an advantage that the component height on the circuit board 6 can be reduced. However, when an external force in the direction of arrow A is applied to the coil device, the circuit board 6 is notched, so that the circuit board 6 The external force cannot be blocked by the rigidity. For this reason, a large external force is applied in the direction in which the adhesion between the core 1 and the terminal 4 is peeled off. However, in the coil device of this embodiment, the annular frame 35 is adhered to the side surface 17 of the collar portion 11 of the core 1. Therefore, the rigidity of the frame body 35 can resist the external force, and the terminal 4 is hardly peeled off.

図４は本発明に係るコイル装置の別の一実施例を示す斜視図、図５は、図４に図示したコイル装置の底面図である。図６は、図４に図示したコイル装置の分解斜視図であって、コアの部分は、その底面から見た状態を示している。図７は、図４に図示したコイル装置の使用状態の一例を示す断面図である。 FIG. 4 is a perspective view showing another embodiment of the coil device according to the present invention, and FIG. 5 is a bottom view of the coil device shown in FIG. FIG. 6 is an exploded perspective view of the coil device shown in FIG. 4, and the core portion shows a state seen from the bottom surface. FIG. 7 is a cross-sectional view illustrating an example of a usage state of the coil device illustrated in FIG. 4.

以下、図６を主体にして説明する。図示されたコイル装置は、コア１と、複数のコイル２１、２２と、基台３と、複数の端子４１１、４１２、４２１、４２２とを含み、４端子のトランスを構成している。 Hereinafter, description will be made with reference to FIG. The illustrated coil device includes a core 1, a plurality of coils 21 and 22, a base 3, and a plurality of terminals 411, 412, 421 and 422, and constitutes a four-terminal transformer.

コア１は図１〜図３に図示したコア１と同様のドラムコアであるが、上下のつば部１１、１２の端面中央に扁平な島状凸部１１１、１２１を有している。島状凸部１１１、１２１は円形に形成され、周囲に形成された段差部１１２、１２２を介してつば部１１、１２の端面周辺部１１０、１２０と連続している。島状凸部１１１、１２１は、コア１の容積を増大させ、コア１の電気的特性及び機械的強度を向上させるとともに、コイル装置の低背化に資する。島状凸部１１１の段差部１１２の高さ寸法は、端子４の厚み寸法以下に設定されている。 The core 1 is a drum core similar to the core 1 illustrated in FIGS. 1 to 3, but has flat island-shaped convex portions 111 and 121 at the center of the end surfaces of the upper and lower collar portions 11 and 12. The island-shaped convex portions 111 and 121 are formed in a circular shape, and are continuous with the end surface peripheral portions 110 and 120 of the flange portions 11 and 12 through step portions 112 and 122 formed in the periphery. The island-shaped convex portions 111 and 121 increase the volume of the core 1, improve the electrical characteristics and mechanical strength of the core 1, and contribute to a reduction in the height of the coil device. The height dimension of the stepped portion 112 of the island-shaped convex portion 111 is set to be equal to or less than the thickness dimension of the terminal 4.

コア１は、図１〜図３に図示したコア１と同様、基台接合面１３と、端子接合面１４とを含んでいる。基台接合面１３は、一方のつば部１１の端面周辺部１１０を８分割した分割部分に、互いに一つの分割部分を隔てて設けられるとともに、一方のつば部１１の側面１７全周にわたって設けられる。端子接合面１４は、一方のつば部１１の端面周辺部１１０に設けられた基台接合面１３の両側に隣接してそれぞれ互い違いに設けられる。コア１のその他の部分は、図１〜図３に図示したコア１と同様の構成であり、重複説明を省略する。 The core 1 includes a base joint surface 13 and a terminal joint surface 14 like the core 1 illustrated in FIGS. 1 to 3. The base joint surface 13 is provided in a divided portion obtained by dividing the end surface peripheral portion 110 of one collar portion 11 into eight portions, with one divided portion therebetween, and is provided over the entire circumference of the side surface 17 of the one collar portion 11. . The terminal joint surfaces 14 are alternately provided adjacent to both sides of the base joint surface 13 provided at the end surface peripheral portion 110 of the one flange portion 11. The other parts of the core 1 have the same configuration as that of the core 1 shown in FIGS.

複数のコイル２１、２２は、トランスを構成する一次コイル２１と二次コイル２２とを含み、それぞれ巻き線部１０に巻回される。 The plurality of coils 21 and 22 include a primary coil 21 and a secondary coil 22 that constitute a transformer, and are wound around the winding portion 10.

基台３は、図１〜図３に図示した基台３と同様、コア接合部３１と、端子結合部３２とを含んでいる。コア接合部３１は、コア受け部３３と、枠体３５とを含んでいる。枠体３５は、コア４の一方のつば部１１に形成された側面１７の全周に接合するように、環状に形成される。コア受け部３３は、一方のつば部１１の端面に設けられたそれぞれの基台接合面１３に接合するように、枠体３５からそれぞれ引き出されて形成され、それぞれの一端が枠体３５と連続している。 The base 3 includes a core joint portion 31 and a terminal coupling portion 32, similarly to the base 3 illustrated in FIGS. 1 to 3. The core joint portion 31 includes a core receiving portion 33 and a frame body 35. The frame body 35 is formed in an annular shape so as to be joined to the entire circumference of the side surface 17 formed on one collar portion 11 of the core 4. The core receiving portion 33 is formed by being pulled out from the frame body 35 so as to be joined to each base joint surface 13 provided on the end surface of one collar portion 11, and one end of each core receiving portion 33 is continuous with the frame body 35. doing.

端子結合部３２は、端子４の板面に結合する部分と、端子４の端面に結合する部分とを含んでいる。端子結合部３２の構成は、外部端子結合部３６に形成された円柱状の突起３６１が、各端子４に対応してそれぞれ１個である点を除き図１〜図３に図示した端子結合部３２と同様の構成であり、重複説明を省略する。 The terminal coupling portion 32 includes a portion coupled to the plate surface of the terminal 4 and a portion coupled to the end surface of the terminal 4. The terminal coupling portion 32 has the same structure as the terminal coupling portion shown in FIGS. 1 to 3 except that there is one cylindrical protrusion 361 formed on the external terminal coupling portion 36 corresponding to each terminal 4. The configuration is the same as that of FIG.

複数の端子４１１、４１２、４２１、４２２は、一次コイル２１及び二次コイル２２のそれぞれ正側、負側端末に対応した一次側端子４１１、４１２と、二次側端子４２１、４２２とを含み、４端子で構成されている。 The plurality of terminals 411, 412, 421, 422 include primary side terminals 411, 412 corresponding to the positive side and negative side terminals of the primary coil 21 and the secondary coil 22, respectively, and secondary side terminals 421, 422, It consists of 4 terminals.

それぞれの端子４１１、４１２、４２１、４２２の構成は、外部接続端子部４６の引出し部に形成された貫通孔４６１が、各端子毎にそれぞれ１個である点を除き図１〜図３に図示した端子４と同様の構成であり、重複説明を省略する。 The configuration of each of the terminals 411, 412, 421, and 422 is illustrated in FIGS. 1 to 3 except that the number of through holes 461 formed in the lead-out portion of the external connection terminal portion 46 is one for each terminal. The configuration is the same as that of the terminal 4 described above, and redundant description is omitted.

本実施例においても、端子４１１、４１２、４２１、４２２は、リードフレームとして連続して形成され、インサート成形により基台３と一体的に結合して形成される。基台３のコア受け部３３が、端子４１１、４１２、４２１、４２２の板厚と同じ厚さの０．１５ｍｍ程度に成形される点も、図１〜図３に図示した基台３及び端子４と同様である。このため、本実施例においても、端子４１１、４１２、４２１、４２２の端子４の基部４７と基台３のコア受け部３３とは、それぞれその両面が同一平面上に形成される。 Also in this embodiment, the terminals 411, 412, 421, and 422 are formed continuously as a lead frame, and are integrally formed with the base 3 by insert molding. The core receiving portion 33 of the base 3 is formed to a thickness of about 0.15 mm, which is the same as the plate thickness of the terminals 411, 412, 421, 422. The same as 4. For this reason, also in the present embodiment, the both sides of the base 47 of the terminal 4 of the terminals 411, 412, 421, and 422 and the core receiving portion 33 of the base 3 are formed on the same plane.

互いに結合して形成された基台３及び端子４１１、４１２、４２１、４２２は、図１〜図３に図示したコイル装置と同様コア１と接着により一体化されている。具体的には、基台３のコア受け部３３は、コア１の一方のつば部１１の島状凸部１１１を除くつば部１１の端面周辺部１１０に形成された基台接合面１３に接着剤５を用いて接着される。基台３の枠部３５は、コア１の一方のつば部１１に形成された側面１７の全周に接着剤５を用いて接着される。端子４１１、４１２、４２１、４２２のコア接合面４４は、コア１の一方のつば部１１の島状凸部１１１を除くつば部１１の端面周辺部１１０に形成された端子接合面１４に接着剤５を用いて接着される。島状凸部１１１の段差部の高さ寸法は、端子４１１、４１２、４２１、４２２の厚み寸法以下に設定されている。このため、コイル装置の底面において、島状凸部１１１が端子４１１、４１２、４２１、４２２及び基台３の底面より突出することがない。島状凸部１１１は、コア１の容積を増大させ、コア１の電気的特性及び機械的強度を向上させる。このため、コア１のつば部１１の厚みを薄くすることができる。この構造は、コイル装置を低背化できることを意味している。コア上面の島状凸部１２１は、上方のつば部１２の厚みをわずかに厚くすることで不要とすることができる。コア上面に島状凸部を形成しなければ、コイル装置の更なる低背化を実現できる。 The base 3 and the terminals 411, 412, 421, and 422 formed by being connected to each other are integrated with the core 1 by bonding in the same manner as the coil device shown in FIGS. Specifically, the core receiving portion 33 of the base 3 is bonded to the base joint surface 13 formed on the end surface peripheral portion 110 of the collar portion 11 excluding the island-shaped convex portion 111 of one collar portion 11 of the core 1. Adhesion is performed using Agent 5. The frame portion 35 of the base 3 is bonded to the entire circumference of the side surface 17 formed on one collar portion 11 of the core 1 using the adhesive 5. The core bonding surfaces 44 of the terminals 411, 412, 421, and 422 are bonded to the terminal bonding surfaces 14 formed on the end surface peripheral portion 110 of the collar portion 11 excluding the island-shaped convex portions 111 of one collar portion 11 of the core 1. 5 is used for bonding. The height dimension of the step portion of the island-shaped convex portion 111 is set to be equal to or less than the thickness dimension of the terminals 411, 412, 421, and 422. For this reason, the island-shaped convex portion 111 does not protrude from the terminals 411, 412, 421, 422 and the bottom surface of the base 3 on the bottom surface of the coil device. The island-shaped convex portion 111 increases the volume of the core 1 and improves the electrical characteristics and mechanical strength of the core 1. For this reason, the thickness of the collar part 11 of the core 1 can be made thin. This structure means that the coil device can be reduced in height. The island-shaped convex portion 121 on the upper surface of the core can be made unnecessary by slightly increasing the thickness of the upper collar portion 12. If the island-shaped convex portion is not formed on the upper surface of the core, the coil device can be further reduced in height.

本実施例において、コア１の基台接合面１３は、コア１の隣接する端子接合面１４間において、コア１の相対抗する外周縁から中心に向かって、それぞれコア１の直径寸法の１／４の長さに設定されている。 In the present embodiment, the base joint surface 13 of the core 1 is 1 / of the diameter dimension of the core 1 from the outer peripheral edge that opposes the core 1 to the center between the adjacent terminal joint surfaces 14 of the core 1. The length is set to 4.

コイル２１、２２は、コア１の巻き線部１０に巻回される。巻回されたコイル２１、２２の端末はそれぞれ端子４１１、４１２、４２１、４２２のコイル接続部４５１にからげられ、はんだ付けや溶接等の手段でコイル接続端子部４５に接続される。 The coils 21 and 22 are wound around the winding portion 10 of the core 1. The ends of the wound coils 21 and 22 are wound around the coil connection portions 451 of the terminals 411, 412, 421, and 422, respectively, and connected to the coil connection terminal portion 45 by means of soldering or welding.

本実施例のコイル装置は、図１〜図３に図示したコイル装置と同様に、コイル装置全体として端子接着強度が高く、放熱性能が優れているという作用効果を有している。このため、はんだ付けの熱によって端子４１１、４１２、４２１、４２２の接着強度の低下が発生しにくいため、図７に図示したようにコイル装置の下面をはんだ付けすることができ、回路基板６にはんだ付け実装したときの実装ススペースを削減できる。しかも、コイル装置で発生した熱は、短い経路で回路基板６の実装パターン６４に放出できるので、放熱性能を更に向上できる。 The coil device of the present embodiment has the effect that the terminal strength of the coil device as a whole is high and the heat dissipation performance is excellent, like the coil device shown in FIGS. For this reason, since the adhesive strength of the terminals 411, 412, 421, and 422 is hardly lowered by the heat of soldering, the lower surface of the coil device can be soldered as shown in FIG. Mounting space can be reduced when soldered. In addition, since the heat generated in the coil device can be released to the mounting pattern 64 of the circuit board 6 through a short path, the heat dissipation performance can be further improved.

本実施例のコイル装置において、基台３の環状の枠部３５は必ずしもコア１の全周に形成する必要は無く、部分的に形成されていても良い。図７に図示したようにコイル装置の下面をはんだ付けして実装した場合、コイル装置の上方から加わる矢印Ａ方向の外力に対して回路基板６の剛性で抗することができ、図１〜図３に図示したコイル装置と比較して基台３の剛性を低く設定できるので、端子４の外部接続端子部引き出し部において、端子４の板面に結合できる構成であれば良い。また、環状の枠部３５をコア１のつば部１１の側面１７から空間を介して形成すれば、ドラムコア１にリングコアを組み合わせることができる。ドラムコア１の巻き線部１０及びつば部１１、１２の周囲をリングコアで覆うようにドラムコア１にリングコアを被せ、リングコアの端部をドラムコア１のつば部１１の側面１７と環状の枠部３５との空間に配置すれば、閉磁路型の組み合わせコアが構成できる。 In the coil device of this embodiment, the annular frame portion 35 of the base 3 is not necessarily formed on the entire circumference of the core 1 and may be formed partially. When soldering and mounting the lower surface of the coil device as shown in FIG. 7, the rigidity of the circuit board 6 can resist the external force applied in the direction of arrow A from above the coil device. Since the rigidity of the base 3 can be set lower than that of the coil device illustrated in FIG. 3, the external connection terminal portion lead-out portion of the terminal 4 may be configured to be coupled to the plate surface of the terminal 4. Further, if the annular frame portion 35 is formed from the side surface 17 of the collar portion 11 of the core 1 via a space, the ring core can be combined with the drum core 1. The drum core 1 is covered with a ring core so that the periphery of the winding portion 10 and the collar portions 11 and 12 of the drum core 1 is covered with the ring core, and the end portion of the ring core is formed between the side surface 17 of the collar portion 11 of the drum core 1 and the annular frame portion 35. If arranged in a space, a closed magnetic path type combination core can be formed.

さらに、本発明に用いるコアはドラムコアに限定されず、また、円形以外の角型コアであってもよい。 Furthermore, the core used in the present invention is not limited to a drum core, and may be a square core other than a circle.

図８は本発明に係るコイル装置の別の一実施例を示す斜視図、図９は、図８に図示したコイル装置の底面図である。図１０は、図８に図示したコイル装置の分解斜視図であって、コアの部分は、その底面から見た状態を示している。 8 is a perspective view showing another embodiment of the coil device according to the present invention, and FIG. 9 is a bottom view of the coil device shown in FIG. FIG. 10 is an exploded perspective view of the coil device shown in FIG. 8, and the core portion shows a state seen from the bottom surface.

図示されたコイル装置は、コア１と、コイル２と、基台３と、一対の端子４とを含み、インダクタを構成している。 The illustrated coil device includes a core 1, a coil 2, a base 3, and a pair of terminals 4, and constitutes an inductor.

コア１は図４〜図７に図示したコア１と同様の島状凸部１１１、１２１を含むドラムコアである。コア１は、図４〜図７に図示したコア１と同様、基台接合面１３と、端子接合面１４とを含んでいるが、本実施例において、端子４は一対で構成されるため、基台接合面１３は、一方のつば部１１の端面周辺部を４分割した分割部分に、互いに一つの分割部分を隔てて設けられ、端子接合面１４は、基台接合面１３の両側にそれぞれ対向して設けられる。コア１のその他の部分は、図４〜図７に図示したコア１と同様の構成であり、重複説明を省略する。 The core 1 is a drum core including island-shaped convex portions 111 and 121 similar to the core 1 illustrated in FIGS. The core 1 includes the base joint surface 13 and the terminal joint surface 14 as in the core 1 illustrated in FIGS. 4 to 7, but in this embodiment, the terminals 4 are configured as a pair, The base joint surface 13 is provided in a divided portion obtained by dividing the peripheral portion of the end surface of one of the flange portions 11 into one divided portion, and the terminal joint surface 14 is provided on both sides of the base joint surface 13 respectively. Opposed. The other parts of the core 1 have the same configuration as that of the core 1 shown in FIGS.

基台３は、図４〜図７に図示した基台３と同様の構成であり、一対の端子４とインサート成形により一体的に結合されている。 The base 3 has the same configuration as the base 3 illustrated in FIGS. 4 to 7 and is integrally coupled to the pair of terminals 4 by insert molding.

一対の端子４は、図１〜図３に図示した端子４と同様の構成であるが、互いに対向する辺に円弧状の切り欠き部が形成され、コア接合面４４が、コア１の島状凸部１１１を除くつば部１１の端面周辺部１１０に形成された端子接合面１４に接着可能に構成されている。 The pair of terminals 4 has the same configuration as the terminal 4 illustrated in FIGS. 1 to 3, but arc-shaped notches are formed on opposite sides, and the core joining surface 44 is an island shape of the core 1. It is comprised so that it can adhere | attach on the terminal joining surface 14 formed in the end surface peripheral part 110 of the collar part 11 except the convex part 111. FIG.

その他の部分は、図１〜図３に図示した実施例あるいは図４〜図７に図示した実施例と同様であり、重複説明を省略する。 Other parts are the same as those of the embodiment shown in FIGS. 1 to 3 or the embodiment shown in FIGS.

以上、好ましい実施例を参照して本発明を詳細に説明したが、本発明はこれらに限定されるものではなく、当業者であれば、その基本的技術思想および教示に基づき、種々の変形例を想到できることは自明である。 The present invention has been described in detail with reference to the preferred embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made by those skilled in the art based on the basic technical idea and teachings. It is self-evident that

本発明に係るコイル装置の一実施例を示す斜視図である。It is a perspective view which shows one Example of the coil apparatus which concerns on this invention. 図１に図示したコイル装置の分解斜視図である。FIG. 2 is an exploded perspective view of the coil device illustrated in FIG. 1. 図１に図示したコイル装置の使用状態の一例を示す断面図である。It is sectional drawing which shows an example of the use condition of the coil apparatus shown in FIG. 本発明に係るコイル装置の別の一実施例を示す斜視図である。It is a perspective view which shows another one Example of the coil apparatus which concerns on this invention. 図４に図示したコイル装置の底面図である。FIG. 5 is a bottom view of the coil device illustrated in FIG. 4. 図４に図示したコイル装置の分解斜視図である。FIG. 5 is an exploded perspective view of the coil device illustrated in FIG. 4. 図４に図示したコイル装置の使用状態の一例を示す断面図である。It is sectional drawing which shows an example of the use condition of the coil apparatus shown in FIG. 本発明に係るコイル装置の別の一実施例を示す斜視図である。It is a perspective view which shows another one Example of the coil apparatus which concerns on this invention. 図８に図示したコイル装置の底面図である。FIG. 9 is a bottom view of the coil device illustrated in FIG. 8. 図８に図示したコイル装置の分解斜視図である。FIG. 9 is an exploded perspective view of the coil device illustrated in FIG. 8.

Explanation of symbols

１コア
１０巻線部
１３基台接合面
１４端子接合面
２、２１、２２コイル
３基台
３１、４４コア接合部
３２端子結合部
４、４１１、４１２、４２１、４２２端子
４５１コイル接続部 DESCRIPTION OF SYMBOLS 1 Core 10 Winding part 13 Base joint surface 14 Terminal joint surface 2, 21, 22 Coil 3 Base 31, 44 Core joint 32 Terminal coupling part 4, 411, 412, 421, 422 Terminal 451 Coil connection part

Claims

A coil device including a core, a coil, a base, and a terminal,
The core includes a winding part, a base joining surface, and a terminal joining surface, and a coil is wound around the winding part,
The base is made of a synthetic resin, and includes a core joint portion and a terminal joint portion,
The terminal is made of a metal plate, includes a core joint portion and a coil connection portion, and is coupled to the base via the terminal coupling portion formed on the base,
The core joint formed on the base and the core joint formed on the terminal are in surface contact with and bonded to the base joint surface of the core and the terminal joint surface of the core, respectively.
The coil is connected to the coil connection portion formed on the terminal.
Coil device.

The coil device according to claim 1,
The terminal has a through hole formed in a portion that is coupled to the terminal coupling portion formed on the base,
The through hole is embedded with a synthetic resin of the terminal coupling portion,
Coil device.

The coil device according to claim 1 or 2,
The core is composed of a drum core,
The base joint surface is formed on one flange end face of the drum core and one flange side surface of the drum core,
The terminal joint surface is formed on one end face of the flange of the drum core.
Coil device.

The coil device according to claim 3,
A flat island-shaped convex portion is formed at the center of the end surface of the flange portion of the drum core,
The island-shaped convex part is continuous with the peripheral part of the end face of the collar part through the step part formed in the periphery,
The height dimension of the stepped portion of the island-shaped convex portion is set to be equal to or less than the thickness dimension of the terminal,
The base joint surface is formed on a peripheral portion of one flange portion end surface of the drum core and one flange portion side surface of the drum core,
The terminal joint surface is formed in a peripheral portion of one end surface of the flange portion of the drum core.
Coil device.

The coil device according to any one of claims 1 to 4,
The base joint surface formed between the terminal joint surfaces of the core has a length of ¼ or more of the dimension between the outer edges, respectively, from the opposite outer edges of the core toward the center.
Coil device.