JP2007207928A

JP2007207928A - Coil component and its manufacturing process

Info

Publication number: JP2007207928A
Application number: JP2006023459A
Authority: JP
Inventors: Makoto Morita; 誠森田; Shinichi Sato; 真一佐藤; Satoru Kurimoto; 哲栗本; Toru Takashima; 亨鷹島; Sumio Takahashi; 純雄高橋; Yoshiaki Kitajima; 義章北嶋
Original assignee: TDK Corp
Current assignee: TDK Corp
Priority date: 2006-01-31
Filing date: 2006-01-31
Publication date: 2007-08-16
Anticipated expiration: 2026-01-31
Also published as: JP4479669B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing process of a coil component in which the winding can be coated easily with resin containing magnetic powder even when a core with a narrow interval between flanges is employed, and to provide a coil component obtained through that process. <P>SOLUTION: The manufacturing process of a coil component comprises a step for preparing a coil section equipped with a core having a winding core portion and a pair of flanges provided at the opposite ends thereof, and a winding wound around the winding core portion and disposed in a region between the pair of flanges, a step for supplying a resin composition into the region between the pair of flanges to cover the winding, and a step for curing the resin composition. The interval between the pair of flanges is 0.15-0.80 mm and a resin composition containing one liquid type epoxy resin and ferrite wherein the content of ferrite is 20-62.5 mass% for the total amount of epoxy resin and ferrite and the density is 1.3-2.2 g/cm<SP>3</SP>is employed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、コイル部品及びその製造方法、特に、巻線が樹脂硬化物により保護されたコイル部品及びその製造方法に関する。 The present invention relates to a coil component and a manufacturing method thereof, and more particularly to a coil component in which a winding is protected by a cured resin and a manufacturing method thereof.

コイル部品としては、巻芯部及びこの巻芯部の両端に設けられた顎部を有するコア（ドラム型コア）と、巻芯部に導線が巻回されてなる巻線とを備えた構造を有するものが一般に知られている。この種のコイル部品においては、巻線の保護等を目的として、巻線を樹脂で被覆することが行われている。またこの場合、樹脂中にフェライト等の磁性粉末を含有させることで、コイル部品のインダクンス値を良好に維持できるようになることが知られている。このような構成を有するコイル部品としては、例えば、巻線を磁性粉含有外装樹脂で覆った構成を有するものが知られている（特許文献１参照）。
特開２００５−２１００５５号公報 As a coil component, a structure having a core (drum-type core) having a winding core and jaws provided at both ends of the winding core, and a winding formed by winding a conductive wire around the winding core. What you have is generally known. In this type of coil component, the winding is covered with a resin for the purpose of protecting the winding. In this case, it is known that the inductance value of the coil component can be maintained well by including a magnetic powder such as ferrite in the resin. As a coil component having such a configuration, for example, one having a configuration in which a winding is covered with a magnetic powder-containing exterior resin is known (see Patent Document 1).
Japanese Patent Laid-Open No. 2005-210055

上記従来技術のコイル部品において、磁性粉含有外装樹脂は、その原料（塗料）をディスペンサーを用いて一対の顎部間の空間領域に充填することにより形成されている。ところが、近年のコイル部品の小型化に伴ってコアも小型化されており、このコアにおける顎部間の間隔が狭くされる傾向にある。この場合、従来のようなディスペンサーを用いた方法では、樹脂を吐出するノズルを狭い顎部間の領域内に配置するのが困難であるため、当該領域内に良好に樹脂を充填することができない。かかる不都合を回避するためにノズルを小型化する方法も考えられるが、この場合は、塗料中に含まれる磁性粉末がノズルを閉塞させるといった問題が生じ易くなる。 In the above-described prior art coil component, the magnetic powder-containing exterior resin is formed by filling the raw material (paint) into the space region between the pair of jaws using a dispenser. However, with the recent miniaturization of coil components, the core has also been miniaturized, and the interval between the jaws in this core tends to be narrowed. In this case, in the conventional method using a dispenser, it is difficult to arrange the nozzle for discharging the resin in the region between the narrow jaws, and thus the region cannot be filled with the resin satisfactorily. . In order to avoid such an inconvenience, a method of reducing the size of the nozzle is also conceivable. However, in this case, a problem that the magnetic powder contained in the coating material closes the nozzle is likely to occur.

そこで、本発明はこのような事情に鑑みてなされたものであり、顎部間の間隔が狭いコアを用いる場合であっても、磁性粉末を含む樹脂によって巻線を容易に被覆することができるコイル部品の製造方法、及び、これにより得られるコイル部品を提供することを目的とする。 Therefore, the present invention has been made in view of such circumstances, and even when a core having a narrow interval between jaws is used, the winding can be easily covered with a resin containing magnetic powder. It aims at providing the manufacturing method of a coil component, and the coil component obtained by this.

上記目的を達成するため、本発明のコイル部品の製造方法は、巻芯部及びこの巻芯部の両端に設けられた一対の顎部を有するコアと、巻芯部に巻回されて一対の顎部間に挟まれた領域内に配置された巻線とを備えるコイル部を準備する準備工程と、巻線を覆うように一対の顎部間に挟まれた領域内に樹脂組成物を供給する供給工程と、樹脂組成物を硬化させる硬化工程とを有し、一対の顎部間の間隔は、０．１５〜０．８０ｍｍであり、樹脂組成物は、一液型のエポキシ樹脂とフェライトとを含み、且つ、フェライトの含有量がエポキシ樹脂及びフェライトの総量に対して２０〜６２．５質量％であるものであり、樹脂組成物の密度は、１．３ｇ／ｃｍ^３〜２．２ｇ／ｃｍ^３であることを特徴とする。 In order to achieve the above object, a method for manufacturing a coil component according to the present invention comprises a core having a core part and a pair of jaw parts provided at both ends of the core part, and a pair of coils wound around the core part. A preparation process for preparing a coil portion including a winding disposed in a region sandwiched between jaws, and supplying a resin composition in a region sandwiched between a pair of jaws so as to cover the windings And a curing step for curing the resin composition, the distance between the pair of jaws is 0.15 to 0.80 mm, and the resin composition is a one-pack type epoxy resin and ferrite And the ferrite content is 20 to 62.5 mass% with respect to the total amount of the epoxy resin and the ferrite, and the density of the resin composition is 1.3 g / cm ^{3 to} 2.2 g. / Cm ³ .

本発明のコイル部品の製造方法においては、上述の如く、一対の顎部間に挟まれた狭い（０．１５〜０．８０ｍｍ）領域に対し、上記所定の組成及び密度を有する樹脂組成物を供給することによって、樹脂による巻線の被覆を行っている。この特定の樹脂組成物は、上記の狭い領域内に供給されると、毛管現象によって当該領域内を均一に満たすように広がることができる。したがって、本発明によれば、ディスペンサーを用いなくても巻線を樹脂組成物で覆うことが容易であり、顎部間の間隔が狭くされたコアを用いる場合に巻線の樹脂による被覆を良好に行うことが可能となる。 In the method of manufacturing a coil component according to the present invention, as described above, the resin composition having the predetermined composition and density is applied to a narrow (0.15 to 0.80 mm) region sandwiched between a pair of jaws. By supplying, the winding is covered with resin. When the specific resin composition is supplied into the narrow region, it can spread so as to uniformly fill the region by capillary action. Therefore, according to the present invention, it is easy to cover the winding with the resin composition without using a dispenser, and the coating of the winding with the resin is good when using a core with a narrow gap between the jaws. Can be performed.

上記本発明のコイル部品の製造方法においては、上述した供給工程において、コアにおける一対の顎部の外周部同士を結んで構成される端面を、樹脂組成物の液面に接触させることが好ましい。この場合、樹脂組成物は、その液面に接触させた位置から一対の顎部間の領域内に毛管現象によって這い上がり、やがて当該領域内を満たすことになる。したがって、この方法によれば、一対の顎部間に挟まれた領域内に樹脂組成物を供給するのが一層容易となる。 In the manufacturing method of the coil component of the present invention, in the supplying step described above, it is preferable that an end surface formed by connecting the outer peripheral portions of the pair of jaw portions in the core is in contact with the liquid surface of the resin composition. In this case, the resin composition crawls up into the region between the pair of jaws from the position in contact with the liquid level by capillary action, and eventually fills the region. Therefore, according to this method, it becomes easier to supply the resin composition in the region sandwiched between the pair of jaws.

より具体的には、樹脂組成物として、１５００〜８０００ｍＰａ・ｓの粘度を有するものを用いることがより好ましい。かかる範囲の粘度を有する樹脂組成物によれば、毛管現象による一対の顎部間の領域への樹脂組成物の充填が更に生じ易くなる。 More specifically, it is more preferable to use a resin composition having a viscosity of 1500 to 8000 mPa · s. According to the resin composition having a viscosity in such a range, the resin composition is more easily filled in the region between the pair of jaws due to capillary action.

また、本発明のコイル部品は、上記本発明のコイル部品の製造方法により好適に得られるものであり、巻芯部及びこの巻芯部の両端に設けられた一対の顎部を有するコアと、巻芯部に巻回されて一対の顎部間に挟まれた領域内に配置された巻線とを備えるコイル部と、巻線を覆うように一対の顎部間に挟まれた領域内に形成された被覆部とを備え、一対の顎部間の間隔は、０．１５〜０．８０ｍｍであり、被覆部は、エポキシ樹脂硬化物及びフェライトを含み、且つ、この被覆部中のフェライトの含有量は、エポキシ樹脂硬化物及びフェライトの総量に対して２０〜６２．５質量％であり、被覆部の密度は、１．３ｇ／ｃｍ^３〜２．２ｇ／ｃｍ^３であることを特徴とする。 Moreover, the coil component of the present invention is preferably obtained by the above-described method for manufacturing a coil component of the present invention, and a core having a core part and a pair of jaw parts provided at both ends of the core part, In a region sandwiched between a pair of jaws so as to cover the winding, and a coil unit including a winding wound around the core and disposed in a region sandwiched between the pair of jaws And a gap between the pair of jaw parts is 0.15 to 0.80 mm, the covering part includes a cured epoxy resin and ferrite, and the ferrite in the covering part content is 20 to 62.5% by mass of the total amount of the epoxy resin cured product and the ferrite, the density of the covering ^portion, and characterized by a 1.3g / cm ³ ~2.2g / cm 3 To do.

本発明によれば、顎部間の間隔が狭いコアを用いる場合であっても、磁性粉末を含む樹脂によって巻線を容易に被覆することができるコイル部品の製造方法、及び、これにより得られるコイル部品を提供することが可能となる。 Advantageous Effects of Invention According to the present invention, even when a core having a narrow gap between jaws is used, a coil component manufacturing method capable of easily covering a winding with a resin containing magnetic powder, and obtained thereby. Coil parts can be provided.

以下、図面を参照して本発明の好適な実施形態について詳細に説明する。図面の説明において、同一の要素には同一の符号を付し、重複する説明は省略する。 DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant descriptions are omitted.

図１は、好適な実施形態の製造方法により得られたコイル部品を示す斜視図である。また、図２は、図１に示したコイル部品のII−II方向に沿う断面構造を模式的に示す図である。図示されるように、本実施形態のコイル部品１は、コア２、巻線４及び被覆部８から構成されている。 FIG. 1 is a perspective view showing a coil component obtained by the manufacturing method of a preferred embodiment. FIG. 2 is a diagram schematically showing a cross-sectional structure along the II-II direction of the coil component shown in FIG. As shown in the drawing, the coil component 1 according to the present embodiment includes a core 2, a winding 4, and a covering portion 8.

コア２は、図２に示すように、柱状の巻芯部１２と、この巻芯部１２の軸方向両端に設けられた一対の顎部１４とを有している。一対の顎部１４は、それぞれ巻芯部１２からその周方向に張り出した形状となっており、互いに略平行に配置されている。かかるコア２は、例えば、フェライト等の磁性体から構成される。本実施形態において、コア２における一対の顎部１４間の間隔（図２中ｃで表される距離）は、０．１５〜０．８０ｍｍ、好ましくは０．１５〜０．６０ｍｍとされる。また、額部１４の外形寸法（例えば、額部１４の対向する辺間の距離）は、１０ｍｍ以下であると好ましく、通常は３ｍｍ程度とされる。 As shown in FIG. 2, the core 2 has a columnar core portion 12 and a pair of jaw portions 14 provided at both ends of the core portion 12 in the axial direction. Each of the pair of jaw portions 14 has a shape protruding in the circumferential direction from the core portion 12 and is disposed substantially parallel to each other. The core 2 is made of a magnetic material such as ferrite, for example. In this embodiment, the space | interval (distance represented by c in FIG. 2) between a pair of jaw parts 14 in the core 2 is 0.15-0.80 mm, Preferably it is 0.15-0.60 mm. Further, the outer dimension of the forehead portion 14 (for example, the distance between opposite sides of the forehead portion 14) is preferably 10 mm or less, and usually about 3 mm.

巻線４は、コア２の巻芯部１２に巻回されて、コア２における一対の顎部１４間に挟まれた領域内に収容されている。この巻線４は、導線等から構成されている。かかる巻線４と上記のコア２とからコイル部６が構成される。巻線４の両端の引き出し部４ａは、それぞれ一方の顎部１４（図中下側）の周側面に引き出されている。この周側面に引き出された引き出し部４ａは、周側面に設けられている溝等に嵌め込まれ、コイル部品１を基板等に面実装するための継線１０を構成している。なお、継線１０において、引き出し部４ａは、更にめっき等によって覆われていてもよく、また、必ずしも上記のような溝内にはめ込まれていなくてもよい。 The winding 4 is wound around the core 12 of the core 2 and accommodated in a region sandwiched between the pair of jaws 14 in the core 2. The winding 4 is composed of a conducting wire or the like. A coil portion 6 is composed of the winding 4 and the core 2 described above. The lead portions 4a at both ends of the winding 4 are each drawn out to the peripheral side surface of one jaw portion 14 (lower side in the figure). The lead-out portion 4a drawn to the peripheral side surface is fitted into a groove or the like provided on the peripheral side surface, and constitutes a connecting line 10 for surface mounting the coil component 1 on a substrate or the like. In the connecting line 10, the lead portion 4 a may be further covered by plating or the like, and may not necessarily be fitted in the groove as described above.

被覆部８は、巻芯部１２との間で巻線４を挟むように形成され、巻線４を覆う形状となっている。この被覆部８は、好ましくは巻線４同士の隙間にも充填されている。被覆部８の外周面は、顎部１４の周側面と同じかこれよりも巻芯部１２側に位置している。つまり、被覆部８は、一対の顎部１４間に挟まれた領域内に形成されている。 The covering portion 8 is formed so as to sandwich the winding 4 with the core portion 12 and has a shape covering the winding 4. The covering portion 8 is preferably filled in a gap between the windings 4. The outer peripheral surface of the covering portion 8 is the same as the peripheral side surface of the jaw portion 14 or is located closer to the core portion 12 than this. That is, the covering portion 8 is formed in a region sandwiched between the pair of jaw portions 14.

被覆部８は、主にエポキシ樹脂硬化物及びフェライトから構成される。この被覆部８においては、フェライトの含有量が、エポキシ樹脂硬化物及びフェライトの総質量中、２０〜６２．５質量％であり、好ましくは５０〜６０質量％である。また、この被覆部８の密度は、１．３〜２．２ｇ／ｃｍ^３であり、１．８〜２．１ｇ／ｃｍ^３であるとより好ましい。被覆部８の構成材料については、詳しくは後述する。 The covering portion 8 is mainly composed of a cured epoxy resin and ferrite. In this coating | coated part 8, content of a ferrite is 20-62.5 mass% in the total mass of an epoxy resin hardened | cured material and a ferrite, Preferably it is 50-60 mass%. Moreover, the density of this coating | coated part 8 is 1.3-2.2 g / cm < ³ >, and it is more preferable in it being 1.8-2.1 g / cm < ³ >. The constituent material of the covering portion 8 will be described later in detail.

次に、上記構成を有するコイル部品１の好適な製造方法について説明する。 Next, the suitable manufacturing method of the coil component 1 which has the said structure is demonstrated.

まず、コイル部６を準備する（準備工程）。コイル部６は、ドラム型のコア２の巻芯部１２の周囲に、巻線４を巻き付けることにより形成する。巻線４は、一方向に巻き付けてもよく、複数本用いる場合は交差する方向に巻き付けてもよい。 First, the coil part 6 is prepared (preparation process). The coil portion 6 is formed by winding the winding 4 around the core portion 12 of the drum-type core 2. The winding 4 may be wound in one direction, or may be wound in an intersecting direction when a plurality of windings 4 are used.

次いで、コイル部６に対し、巻線４を覆うように一対の顎部１４間に挟まれた領域内に樹脂組成物を供給する（供給工程）。この樹脂組成物は、硬化により上述した被覆部８を形成し得るものである。樹脂組成物の上記領域内への供給は、コア２の外周端面（一対の顎部の外周部同士を結んで構成される端面）を、樹脂組成物の液面に接触させることにより行うことができる。 Next, the resin composition is supplied to the coil portion 6 in a region sandwiched between the pair of jaw portions 14 so as to cover the winding 4 (supplying step). This resin composition can form the coating portion 8 described above by curing. The supply of the resin composition into the region is performed by bringing the outer peripheral end surfaces of the core 2 (end surfaces configured by connecting the outer peripheral portions of the pair of jaws) into contact with the liquid surface of the resin composition. it can.

図３は、コアの外周端面を樹脂組成物の液面に接触させる工程を示す図である。同図に示されるように、本工程においては、所定の容器３０内に収容された十分な量の樹脂組成物２０の液面Ｓに対し、コア２の外周端面を接触させる。こうすると、上述の如く、コア２における一対の顎部１４間の間隔は狭くされているため、樹脂組成物は、毛管現象によって図中矢印で示すように一対の顎部１４間の領域内に這い上がる。そして、樹脂組成物は、巻線４の周囲を回りこむように移動して上記領域内に充填される。こうして、樹脂組成物は、巻線４を覆うように一対の顎部１４間の領域内に供給される。 FIG. 3 is a diagram showing a step of bringing the outer peripheral end surface of the core into contact with the liquid surface of the resin composition. As shown in the figure, in this step, the outer peripheral end surface of the core 2 is brought into contact with a sufficient amount of the liquid surface S of the resin composition 20 accommodated in a predetermined container 30. Thus, as described above, the interval between the pair of jaws 14 in the core 2 is narrowed, so that the resin composition is placed in the region between the pair of jaws 14 as indicated by arrows in the figure due to capillary action. Crawling up. Then, the resin composition moves around the winding 4 and fills the region. Thus, the resin composition is supplied into the region between the pair of jaw portions 14 so as to cover the winding 4.

コア２の樹脂組成物２０の液面Ｓへの接触は、一度で十分な量の樹脂組成物２０を供給することができる場合は一度のみ行えばよく、十分な量を供給することができない場合は複数回行ってもよい。複数回行う場合、樹脂組成物２０の液面Ｓに対するコア２の外周端面の接触位置を変えてもよい。また、上記工程においては、コア２の外周端面は、樹脂組成物中に若干浸漬されるようにしてもよい。この場合、コア２の所望外の領域にまで樹脂組成物が付着しないようにすることが好ましい。 The contact of the resin composition 20 of the core 2 with the liquid level S may be performed only once when a sufficient amount of the resin composition 20 can be supplied, and when a sufficient amount cannot be supplied. May be performed multiple times. When performing several times, you may change the contact position of the outer peripheral end surface of the core 2 with respect to the liquid level S of the resin composition 20. FIG. Moreover, in the said process, you may make it the outer peripheral end surface of the core 2 slightly immersed in a resin composition. In this case, it is preferable that the resin composition does not adhere to an undesired region of the core 2.

このように、かかる工程においては、狭い間隔（０．１５〜０．８０ｍｍ）で配置された一対の顎部１４間の領域内に、毛管現象を利用して樹脂組成物を供給している。この顎部１４間の間隔が０．８０ｍｍを超えると、このような毛管現象が生じ難くなり、巻線４を十分に覆うことができなくなる。一方、０．１５ｍｍ未満であると、樹脂組成物が上記領域内に入り込むことが困難となる傾向にある。 Thus, in this process, the resin composition is supplied into the region between the pair of jaw portions 14 arranged at a narrow interval (0.15 to 0.80 mm) by utilizing capillary action. When the interval between the jaw portions 14 exceeds 0.80 mm, such capillary phenomenon is difficult to occur, and the winding 4 cannot be sufficiently covered. On the other hand, if it is less than 0.15 mm, it tends to be difficult for the resin composition to enter the region.

樹脂組成物は、一液型のエポキシ樹脂及びフェライトを含むものである。ここで、一液型のエポキシ樹脂とは、オキシラン環を２つ以上有する多官能性エポキシ化合物からなる主剤と、当該化合物の硬化を生じさせる硬化剤とをあらかじめ含み、室温等の通常の条件下では硬化反応が実質的に進行しないものをいい、主剤と硬化剤とを混合すると直ちに硬化が生じるような二液型のエポキシ樹脂とは異なるものである。 The resin composition contains a one-pack type epoxy resin and ferrite. Here, the one-pack type epoxy resin includes a main agent composed of a polyfunctional epoxy compound having two or more oxirane rings and a curing agent that causes curing of the compound in advance, under normal conditions such as room temperature. In this case, the curing reaction does not substantially proceed, and it is different from a two-pack type epoxy resin in which curing occurs immediately when the main agent and the curing agent are mixed.

例えば、一液型のエポキシ樹脂としては、主剤と硬化剤とを混合して２４℃で放置した場合に、混合物の粘度が８Ｐａ・ｓに到達するまでの時間（可使時間）が、１日以上のものが好ましく、７日以上のものがより好ましい。このような一液型のエポキシ樹脂を含む樹脂組成物は、一対の額部１４間の領域内に供給される際に粘度等の変化を生じ難いため、毛管現象による這い上がりによって上記領域内に均一に満たされるようになる。 For example, as a one-pack type epoxy resin, when the main agent and the curing agent are mixed and left at 24 ° C., the time until the viscosity of the mixture reaches 8 Pa · s (potential time) is 1 day. The above are preferred, and those over 7 days are more preferred. A resin composition containing such a one-pack type epoxy resin is unlikely to change in viscosity or the like when supplied into the region between the pair of forehead portions 14, and therefore, the resin composition within the region due to scooping up by capillary action. It will be filled uniformly.

エポキシ樹脂に含まれる多官能性エポキシ化合物としては、通常、エポキシ樹脂の主剤として用いられるものであれば特に制限なく適用できる。例えば、ビスフェノールＡ、ビスフェノールＦ、ビスフェノールＳ等のビスフェノール型エポキシ樹脂、フェノールノボラック型等のノボラック型エポキシ樹脂、トリグリシジルイソシアヌレート等の多官能性グリシジルアミン樹脂、トリフェニルグリシジルエーテルメタン等の多官能性グリシジルエーテル樹脂等が例示できる。 The polyfunctional epoxy compound contained in the epoxy resin can be applied without particular limitation as long as it is usually used as a main component of the epoxy resin. For example, bisphenol type epoxy resins such as bisphenol A, bisphenol F and bisphenol S, novolac type epoxy resins such as phenol novolac type, polyfunctional glycidyl amine resins such as triglycidyl isocyanurate, and polyfunctionality such as triphenylglycidyl ether methane A glycidyl ether resin etc. can be illustrated.

硬化剤は、上記多官能性エポキシ化合物と混合しても、室温等の通常の条件下では硬化を開始せず、樹脂組成物に熱、光、湿気、圧力等を加えた場合に硬化を開始させ得る成分（潜在形硬化剤）であると好ましい。このような硬化剤としては、上記の条件により所定の変化を生じて硬化作用を発現するものや、もともと硬化温度が高いものが挙げられる。前者の硬化剤としては、ジシアンジアミド、芳香族ジアゾニウム塩、ケトイミン等が例示できる。また、後者の硬化温度が高い硬化剤としては、アミンアダクト型硬化剤が例示できる。さらに、後者の硬化剤としては、その硬化温度が１４０〜１７０℃のものが好ましい。 Even if the curing agent is mixed with the above polyfunctional epoxy compound, curing does not start under normal conditions such as room temperature, and curing starts when heat, light, moisture, pressure, etc. are applied to the resin composition. It is preferable that it is a component (latent form hardening agent) which can be made to be. Examples of such a curing agent include those that cause a predetermined change under the above conditions to develop a curing action and those that originally have a high curing temperature. Examples of the former curing agent include dicyandiamide, aromatic diazonium salt, ketoimine and the like. An example of the latter curing agent having a high curing temperature is an amine adduct type curing agent. Furthermore, as the latter curing agent, those having a curing temperature of 140 to 170 ° C. are preferred.

フェライトとしては、粉状のものが好ましい。そして、樹脂組成物中において、フェライトは、エポキシ樹脂中に略均一に分散されていることが好ましい。フェライトの好適な平均粒径は、５〜３０μｍである。好適なフェライトとしては、例えば、Ｎｉ−Ｃｕ−Ｚｎ系フェライトのような組成を有するものが挙げられる。 The ferrite is preferably in the form of powder. And in a resin composition, it is preferable that the ferrite is disperse | distributed substantially uniformly in the epoxy resin. The suitable average particle diameter of a ferrite is 5-30 micrometers. Suitable ferrites include those having a composition such as Ni—Cu—Zn ferrite.

樹脂組成物中のフェライトの含有量は、エポキシ樹脂及びフェライトの合計質量に対して２０〜６２．５質量％であり、２０〜６０質量％であると好ましく、５０〜６０質量％であると更に好ましい。このフェライト含有量が２０質量％未満であると、フェライト添加によるコイル部品１のインダクタンス（Ｌ値）の向上効果が十分に得られ難くなる。一方、フェライト含有量が６２．５質量％を超えると、粘度が過度に高くなる等によって、毛管現象による樹脂組成物の充填が不十分となる傾向にある。 Content of the ferrite in a resin composition is 20-62.5 mass% with respect to the total mass of an epoxy resin and a ferrite, it is preferable in it being 20-60 mass%, and it is further in it being 50-60 mass% preferable. When the ferrite content is less than 20% by mass, it is difficult to sufficiently obtain the effect of improving the inductance (L value) of the coil component 1 by adding the ferrite. On the other hand, when the ferrite content exceeds 62.5% by mass, the resin composition tends to be insufficiently filled by capillary action due to excessively high viscosity.

上記のような一液型のエポキシ樹脂及びフェライトを含む樹脂組成物の密度は、１．３〜２．２ｇ／ｃｍ^３であり、１．３〜２．１ｇ／ｃｍ^３であるとより好ましく、１．８〜２．１ｇ／ｃｍ^３であると更に好ましい。 Density of the resin composition comprising the one-component epoxy resin and ferrite as described above is 1.3~2.2g / cm ^3, more preferable to be 1.3~2.1g / cm ^3, More preferably, it is 1.8 to 2.1 g / cm ³ .

また、樹脂組成物は、粘度が１５００〜８０００ｍＰａのものであると好ましく、１５００〜６０００ｍＰａのものであるとより好ましく、１５００〜４０００ｍＰａのものであると更に好ましい。樹脂組成物の粘度が１５００ｍＰａ未満である場合、毛管現象による這い上がりが過度に生じ、コア２の外側部分等の好ましくない領域にまで樹脂組成物が付着してしまうおそれがある。一方、８０００ｍＰａを超えると、毛管現象による充填が生じ難くなる傾向にある。 The resin composition preferably has a viscosity of 1500 to 8000 mPa, more preferably 1500 to 6000 mPa, and even more preferably 1500 to 4000 mPa. When the viscosity of the resin composition is less than 1500 mPa, scooping due to capillarity occurs excessively, and the resin composition may adhere to an unfavorable region such as the outer portion of the core 2. On the other hand, if it exceeds 8000 mPa, filling due to capillary action tends to be difficult to occur.

さらに、樹脂組成物は、溶剤を含まないものが好ましい。ここでいう溶剤とは、上述したエポキシ樹脂（特に主剤及び硬化剤）を溶解又は均一に分散し得る液体成分であり、エポキシ樹脂と反応性を有しないものである。例えば、アセトン、メチルエチルケトン、メタノール、２−プロパノール、酢酸エチル等が挙げられる。溶剤を含まないことで、樹脂組成物は、一対の額部１４間の領域内に供給される際に、溶剤の揮発による粘度変化等を生じ難くなり、毛管現象による充填が良好に生じるようになるほか、溶剤揮発によるコイル部品の汚染等も低減されるようになる。 Furthermore, the resin composition preferably does not contain a solvent. A solvent here is a liquid component which can melt | dissolve or disperse | distribute uniformly the epoxy resin mentioned above (especially main ingredient and hardening | curing agent), and does not have reactivity with an epoxy resin. For example, acetone, methyl ethyl ketone, methanol, 2-propanol, ethyl acetate, etc. are mentioned. By not containing the solvent, the resin composition is less likely to cause a change in viscosity due to volatilization of the solvent when supplied into the region between the pair of forehead portions 14, so that filling due to capillary action occurs favorably. In addition, contamination of coil parts due to solvent volatilization is reduced.

以上のように、本実施形態における樹脂組成物は、一液型のエポキシ樹脂及びフェライトを含み、フェライトの含有量及び密度、より好ましくは粘度が特定範囲とされることによって、毛管現象によって狭い一対の顎部１４間の領域内に容易に充填され得る。このため、図３に示すような簡便な方法によって、巻線４を良好に覆うことができる。 As described above, the resin composition in the present embodiment includes a one-pack type epoxy resin and ferrite, and the ferrite content and density, more preferably, the viscosity is within a specific range, so that a narrow pair due to capillary action. The region between the jaws 14 can be easily filled. For this reason, the winding 4 can be satisfactorily covered by a simple method as shown in FIG.

なお、樹脂組成物は、エポキシ樹脂及びフェライトに加え、以下のようなその他の成分を必要に応じて更に含有していてもよい。その他の成分としては、例えば、反応性希釈剤、増粘剤、可塑剤、揺変剤、消泡剤等が挙げられる。ここで、反応性希釈剤とは、樹脂組成物の硬化構造に結合することが可能な官能基等を有する成分であり、主剤等との反応が可能である点で上述した溶剤とは区別される。かかる反応性希釈剤の添加により、樹脂組成物の粘度を好適に調整することができる。 In addition to the epoxy resin and ferrite, the resin composition may further contain other components as described below as necessary. Examples of other components include reactive diluents, thickeners, plasticizers, thixotropic agents, and antifoaming agents. Here, the reactive diluent is a component having a functional group capable of binding to the cured structure of the resin composition, and is distinguished from the above-described solvent in that it can react with the main agent. The By adding such a reactive diluent, the viscosity of the resin composition can be suitably adjusted.

コイル部品１の製造においては、上記のような供給工程を行った後、巻線４を覆うように形成された樹脂組成物を硬化する（硬化工程）。こうして得られる樹脂組成物の硬化物によって、被覆部８が形成され、図１及び２に示す構造のコイル部品１が得られる。樹脂組成物の硬化方法は、樹脂組成物に含有させたエポキシ樹脂に応じて、加熱、光照射等から適宜選択する。例えば、エポキシ樹脂として、硬化剤としてアダクトアミンを含むものを用いた場合は、加熱によって樹脂組成物を好適に硬化させることができる。 In manufacture of the coil component 1, after performing the above supply processes, the resin composition formed so that the coil | winding 4 may be covered is hardened (hardening process). A covering 8 is formed by the cured product of the resin composition thus obtained, and the coil component 1 having the structure shown in FIGS. 1 and 2 is obtained. The curing method of the resin composition is appropriately selected from heating, light irradiation and the like according to the epoxy resin contained in the resin composition. For example, when an epoxy resin containing an adduct amine as a curing agent is used, the resin composition can be suitably cured by heating.

こうして形成される被覆部８は、上述の如く、エポキシ樹脂硬化物とフェライトとを主として含む構成となる。被覆部８を構成するエポキシ樹脂硬化物は、樹脂組成物中のエポキシ樹脂が硬化した成分であり、主剤である多官能性エポキシ化合物が重合してなる重合構造や、この重合構造中に導入された硬化剤に由来する架橋構造等を有するものとなる。そして、フェライトは、例えば、被覆部８において、上記の重合・架橋構造中に略均一に分散した状態で存在する。このようにして形成された被覆部８は、樹脂組成物からの質量及び体積の変化が極めて小さいため、樹脂組成物とほぼ同様の密度を有するものとなる。 As described above, the covering portion 8 formed in this way has a configuration mainly including a cured epoxy resin and ferrite. The cured epoxy resin that constitutes the covering portion 8 is a component obtained by curing the epoxy resin in the resin composition, and is introduced into a polymer structure formed by polymerizing a polyfunctional epoxy compound as a main component, or into this polymer structure. It has a crosslinked structure derived from the hardener. For example, the ferrite is present in the covering portion 8 in a substantially uniformly dispersed state in the polymerization / crosslinking structure. The covering portion 8 formed in this way has a density substantially the same as that of the resin composition because the change in mass and volume from the resin composition is extremely small.

以上、本発明に係るコイル部品及びその製造方法の好適な実施形態について説明したが、本発明は上記の実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更を行うことができる。 The preferred embodiments of the coil component and the manufacturing method thereof according to the present invention have been described above. However, the present invention is not limited to the above-described embodiment, and modifications can be made as appropriate without departing from the spirit of the present invention. it can.

例えば、まず、上記実施形態の供給工程においては、額部１４間に挟まれた領域への樹脂組成物の供給を、コア２の外周端面を樹脂組成物２０の液面Ｓに接触させるようにして行っていたが、これに限定されず、例えば、額部１４間の領域内の少なくとも一箇所に樹脂組成物を注入するようにして行ってもよい。この場合であっても、注入された樹脂組成物は、毛管現象によって額部１４間の領域内に良好に充填され得る。 For example, first, in the supply step of the above embodiment, the resin composition is supplied to the region sandwiched between the forehead portions 14 such that the outer peripheral end surface of the core 2 is brought into contact with the liquid surface S of the resin composition 20. However, the present invention is not limited to this. For example, the resin composition may be injected into at least one place in the region between the forehead portions 14. Even in this case, the injected resin composition can be satisfactorily filled in the region between the forehead portions 14 by capillary action.

また、コイル部材１におけるコア２は、図示のような８角形状の額部１４を有するものに限られず、その他の多角形状や円形状等、種々の形状の額部１４を有するものを適用できる。また、巻芯部１２も同様に、円柱状や多角柱状等、種々の形状をとり得る。 Further, the core 2 in the coil member 1 is not limited to the one having the octagonal forehead portion 14 as shown in the figure, and one having various forehead portions 14 such as a polygonal shape or a circular shape can be applied. . Similarly, the core part 12 can take various shapes such as a columnar shape and a polygonal columnar shape.

以下、本発明を実施例により更に詳細に説明するが、本発明はこれらの実施例に限定されるものではない。
［樹脂組成物の調製］ EXAMPLES Hereinafter, although an Example demonstrates this invention still in detail, this invention is not limited to these Examples.
[Preparation of resin composition]

（調製例１〜５、比較調製例１〜６）
まず、下記表１及び２に示す配合量となるように各成分を配合し、調製例１〜５及び比較調製例１〜６の樹脂組成物をそれぞれ調製した。表中の反応性希釈剤としてはＷＰＥ−２２５、変性脂肪族ポリアミンとしてはＦＨ４３４２Ｓ、アミンアダクト型硬化剤としてはＰＮ−４０、揺変剤としてはシリカエアロゾル、消泡剤としてはシリコーン系消泡剤、フェライト粉末としてはＮｉ−Ｃｕ−Ｚｎ系フェライトをそれぞれ用いた。 (Preparation Examples 1-5, Comparative Preparation Examples 1-6)
First, each component was mix | blended so that it might become the compounding quantity shown in following Table 1 and 2, and the resin composition of the preparation examples 1-5 and the comparative preparation examples 1-6 was prepared, respectively. The reactive diluent in the table is WPE-225, the modified aliphatic polyamine is FH4342S, the amine adduct type curing agent is PN-40, the thixotropic agent is silica aerosol, and the antifoaming agent is a silicone-based antifoaming agent. As the ferrite powder, Ni-Cu-Zn ferrite was used.

得られた各樹脂組成物の密度、粘度及びガラス転移温度をそれぞれ測定し、得られた結果を併せて表１及び２に記した。なお、粘度はＢｒｏｏｋｆｉｌｄ製ＨＢＤＶＩ−ＩのロータＮｏ．１４により１０ｒｐｍの条件で測定した。また、ガラス転移温度は熱分析ＤＳＣ法により測定した。調製例１〜５及び比較例１〜６の樹脂組成物のガラス転移温度は、いずれも５０〜７０℃であった。 The density, viscosity, and glass transition temperature of each obtained resin composition were measured, and the results obtained are shown in Tables 1 and 2. The viscosity is HBDVI-I rotor No. manufactured by Brookfield. 14 under the condition of 10 rpm. The glass transition temperature was measured by a thermal analysis DSC method. The glass transition temperatures of the resin compositions of Preparation Examples 1 to 5 and Comparative Examples 1 to 6 were all 50 to 70 ° C.

［コイル部品の製造］

[Manufacture of coil parts]

（実施例１〜５及び比較例１〜６）
調製例１〜５及び比較調製例１〜６の樹脂組成物をそれぞれ用いて、以下に示すようにしてコイル部品を製造した。すなわち、まず、巻芯部の両端に顎部を有するコアの巻芯部に巻線が巻回されてなるコイル部を準備した。なお、コアとしては、顎部の外形寸法が３ｍｍ、顎部の厚さが１ｍｍであり、一対の顎部間の距離が０．２８ｍｍであるものを用いた。また、巻線としては、０．１１ｍｍ径のものを用い、巻線の巻数は１０．５とした。 (Examples 1-5 and Comparative Examples 1-6)
Using the resin compositions of Preparation Examples 1 to 5 and Comparative Preparation Examples 1 to 6, coil components were produced as follows. That is, first, a coil portion in which a winding was wound around a core portion of a core having jaw portions at both ends of the core portion was prepared. In addition, as a core, the external dimension of a jaw part was 3 mm, the thickness of the jaw part was 1 mm, and the distance between a pair of jaw parts was 0.28 mm. In addition, a winding having a diameter of 0.11 mm was used, and the number of windings was 10.5.

次いで、図３に示すようにコア２の外周端面を樹脂組成物の液面に接触させ、毛管現象により一対の顎部間に挟まれた領域内に樹脂組成物を充填して、これにより巻線４を樹脂組成物で被覆した。その後、樹脂組成物が付着したコイル部に対し、１５０℃、３０分の加熱を行い、樹脂組成物を硬化させて被覆部を形成させ、図１に示す構造を有するコイル部品を得た。調製例１〜５の樹脂組成物を用いた場合が実施例１〜５に、比較調製例１〜６の樹脂組成物を用いた場合が比較例１〜６にそれぞれ該当する。
［特性評価］ Next, as shown in FIG. 3, the outer peripheral end surface of the core 2 is brought into contact with the liquid surface of the resin composition, and the resin composition is filled in a region sandwiched between the pair of jaws by capillary action. Wire 4 was coated with the resin composition. Then, the coil part to which the resin composition was adhered was heated at 150 ° C. for 30 minutes to cure the resin composition to form a coating part, thereby obtaining a coil component having the structure shown in FIG. The cases of using the resin compositions of Preparation Examples 1 to 5 correspond to Examples 1 to 5, and the cases of using the resin compositions of Comparative Preparation Examples 1 to 6 correspond to Comparative Examples 1 to 6, respectively.
[Characteristic evaluation]

（封止性の評価）
実施例１〜５及び比較例１〜６のコイル部品それぞれについて被覆部を観察し、以下の基準に基づいて、被覆部による封止性について評価を行った。
Ａ：被覆部が一対の鍔部間の全領域を満たすように形成されている
Ｂ：被覆部が十分にコイル部を覆っているが、一対の鍔部間の領域を一部満たしていない部分がある
Ｃ：コイル部が一部露出している (Evaluation of sealing performance)
The covering portion was observed for each of the coil components of Examples 1 to 5 and Comparative Examples 1 to 6, and the sealing performance by the covering portion was evaluated based on the following criteria.
A: The covering portion is formed so as to fill the entire region between the pair of flanges B: The portion where the covering portion sufficiently covers the coil portion but does not partially fill the region between the pair of flange portions C: Part of the coil is exposed

（表面汚れの評価）
実施例１〜５及び比較例１〜６のコイル部品の外観を観察して、顎部の所望外の領域への樹脂組成物の付着の程度を以下の基準に基づいて評価した。
Ａ：コイル部品における実装時に吸着させる面には樹脂組成物の付着が殆どない
Ｂ：コイル部品における実装時に吸着させる面に樹脂組成物の流動による付着が見られるが、寸法には影響がないレベル
Ｃ：コイル部品における実装時に吸着させる面に樹脂組成物の付着が見られ、製品高さに影響している (Evaluation of surface contamination)
The appearances of the coil components of Examples 1 to 5 and Comparative Examples 1 to 6 were observed, and the degree of adhesion of the resin composition to an undesired region of the jaw was evaluated based on the following criteria.
A: There is almost no adhesion of the resin composition on the surface of the coil component that is adsorbed during mounting. B: Adhesion due to the flow of the resin composition is observed on the surface of the coil component that is adsorbed during mounting, but there is no effect on the dimensions. C: Adhesion of the resin composition is observed on the surface of the coil component that is adsorbed during mounting, which affects the product height.

（インダクタ特性及びフェライト含有による効果の評価）
実施例１〜５及び比較例１〜６のコイル部品のインダクタンス（Ｌ値、単位：μＨ）を、Ｈｅｗｌｅｔｔ−Ｐａｃｋａｒｄ製４１９４Ａにより測定した。なお、比較例５及び６のコイル部品は、封止が不十分であったためＬ値のばらつきが大きく、特定の値が得られなかった。 (Evaluation of effects of inductor characteristics and ferrite content)
The inductance (L value, unit: μH) of the coil components of Examples 1 to 5 and Comparative Examples 1 to 6 was measured with 4194A manufactured by Hewlett-Packard. In addition, since the coil components of Comparative Examples 5 and 6 were not sufficiently sealed, the L value varied greatly and specific values could not be obtained.

また、フェライト磁性粉末を含有していない樹脂組成物を用いて得られた比較例１のコイル部品のＬ値を基準とし、この比較例１のコイル部品からＬ値が増大した割合（Ｌ値向上率（％））をそれぞれ算出した。 Further, based on the L value of the coil component of Comparative Example 1 obtained by using the resin composition not containing ferrite magnetic powder, the ratio of the L value increased from the coil component of Comparative Example 1 (L value improvement) Rate (%)) was calculated.

表３より、樹脂材料及びフェライト磁性粉の総量中、２０〜６２．５重量％のフェライ磁性粉を含む樹脂組成物を用いて得られた実施例１〜５のコイル部品は、封止性が良好であるほか及び表面汚れも殆どなく、しかも、好適なＬ値を有することが確認された。一方、フェライト磁性粉の含有量が上記範囲外であった樹脂組成物を用いた比較例１〜６のコイル部品は、実施例に比してＬ値が不十分であるか、又は、封止性が良好ではないものであった。
［樹脂組成物の調製］ From Table 3, the coil components of Examples 1 to 5 obtained using the resin composition containing 20 to 62.5% by weight of Ferai magnetic powder in the total amount of the resin material and ferrite magnetic powder have sealing properties. In addition to being good, there was little surface contamination, and it was confirmed that it had a suitable L value. On the other hand, the coil parts of Comparative Examples 1 to 6 using the resin composition in which the content of the ferrite magnetic powder was out of the above range had an insufficient L value as compared with the examples, or were sealed The property was not good.
[Preparation of resin composition]

下記表４に示す配合量となるように各成分を配合し、調製例６〜８の樹脂組成物をそれぞれ調製した。これらの調製例においては、樹脂材料とフェライト磁性粉との配合量を８０：２０に固定するとともに、樹脂材料中の各成分の配合量を変えることで、樹脂組成物の粘度を変化させた。なお、表中の各成分は上記と同様である。また、表には、上記と同様にして測定した各組成物の密度、粘度及びガラス転移温度を記した。 Each component was mix | blended so that it might become the compounding quantity shown in following Table 4, and the resin composition of Preparation Examples 6-8 was prepared, respectively. In these preparation examples, the blending amount of the resin material and the ferrite magnetic powder was fixed at 80:20, and the blending amount of each component in the resin material was changed to change the viscosity of the resin composition. Each component in the table is the same as above. In the table, the density, viscosity and glass transition temperature of each composition measured in the same manner as described above are shown.

［コイル部品の製造］

[Manufacture of coil parts]

調製例６〜８の樹脂組成物をそれぞれ用い、上記と同様の方法により実施例６〜８のコイル部品を製造した。なお、調製例６〜８の樹脂組成物を用いた場合が、それぞれ実施例６〜８に該当する。
［特性評価］ Using the resin compositions of Preparation Examples 6 to 8, coil parts of Examples 6 to 8 were produced in the same manner as described above. In addition, the case where the resin composition of the preparation examples 6-8 is used corresponds to Examples 6-8, respectively.
[Characteristic evaluation]

実施例６〜８のコイル部品について、それぞれ上記と同様にして、封止性及び表面汚れの評価を行った。得られた結果をまとめて表５に示す。 About the coil components of Examples 6-8, sealability and surface contamination were evaluated in the same manner as described above. The results obtained are summarized in Table 5.

表５より、実施例６〜８のコイル部品は、いずれも封止性が良好であった。ただし、粘度が１０００（ｍＰａ・ｓ）である樹脂組成物を用いた実施例６のコイル部品は、表面汚れが若干発生していた。
［コアの寸法による封止性への影響の評価］ From Table 5, all the coil components of Examples 6-8 had good sealing performance. However, the coil component of Example 6 using the resin composition having a viscosity of 1000 (mPa · s) had some surface contamination.
[Evaluation of influence on sealing performance by core dimensions]

調製例４及び８の樹脂組成物をそれぞれ用い、また、コアとして顎部の外形寸法及び顎部間の距離を種々に変化させたものをそれぞれ用いて、上述した実施例と同様にして各種のコイル部品を作製した。そして、得られた各コイル部品について、それぞれ上記と同様にして封止性の評価を行い、コアの寸法による封止性への影響について評価を行った。調製例４の樹脂組成物を用いて得られたコイル部品の結果を表６に、調製例８の樹脂組成物を用いて得られたコイル部品の結果を表７にそれぞれ示した。表中、各種の顎部外形寸法及び顎部間距離を有するコアにそれぞれ対応する箇所に、当該コアを用いて得られたコイル部品による封止性の評価結果を示した。 Each of the resin compositions of Preparation Examples 4 and 8 was used, and various core dimensions and distances between the jaws were used as the core. Coil parts were produced. And about each obtained coil component, sealing property was evaluated similarly to the above, respectively, and the influence on the sealing property by the dimension of a core was evaluated. Table 6 shows the results of the coil parts obtained using the resin composition of Preparation Example 4, and Table 7 shows the results of the coil parts obtained using the resin composition of Preparation Example 8. In the table, the evaluation results of the sealing performance by the coil parts obtained by using the core are shown at locations corresponding to the cores having various external dimensions and distances between the jaws.

表６及び７より、いずれの外形寸法を有する顎部を備えるコアを用いた場合であっても、顎部間の距離が０．１５〜０．８０の範囲内である場合には、そうでない場合に比して良好な封止性が得られることが確認された。 From Tables 6 and 7, even when using a core having a jaw portion having any outer dimension, it is not so when the distance between jaw portions is in the range of 0.15 to 0.80. It was confirmed that better sealing performance was obtained as compared with the case.

好適な実施形態の製造方法により得られたコイル部品を示す斜視図である。It is a perspective view which shows the coil components obtained by the manufacturing method of suitable embodiment. 図１に示したコイル部品のII−II方向に沿う断面構造を模式的に示す図である。It is a figure which shows typically the cross-sectional structure which follows the II-II direction of the coil components shown in FIG. コアの外周端面を樹脂組成物の液面に接触させる工程を示す図である。It is a figure which shows the process of making the outer peripheral end surface of a core contact the liquid level of a resin composition.

Explanation of symbols

１…コイル部品、２…コア、４…巻線、６…コイル部、８…被覆部、１０…継線、１２…巻芯部、１４…顎部、２０…樹脂組成物、３０…容器、Ｓ…液面。
DESCRIPTION OF SYMBOLS 1 ... Coil components, 2 ... Core, 4 ... Winding, 6 ... Coil part, 8 ... Cover part, 10 ... Connection, 12 ... Core part, 14 ... Jaw part, 20 ... Resin composition, 30 ... Container, S: Liquid level.

Claims

A core having a core part and a pair of jaws provided at both ends of the core part, and a winding wound around the core part and disposed in a region sandwiched between the pair of jaw parts And a preparation step of preparing a coil portion comprising:
Supplying a resin composition in a region sandwiched between the pair of jaws so as to cover the winding; and
A curing step of curing the resin composition,
The distance between the pair of jaws is 0.15 to 0.80 mm,
The resin composition includes a one-pack type epoxy resin and ferrite, and the content of the ferrite is 20 to 62.5% by mass with respect to the total amount of the epoxy resin and the ferrite,
The density of the resin composition is 1.3 to 2.2 g / cm ³ .
The manufacturing method of the coil components characterized by the above-mentioned.

2. The manufacturing of a coil component according to claim 1, wherein, in the supplying step, end surfaces configured by connecting outer peripheral portions of the pair of jaw portions in the core are brought into contact with a liquid surface of the resin composition. Method.

The method for manufacturing a coil component according to claim 1, wherein the resin composition has a viscosity of 1500 to 8000 mPa · s.

A core having a core part and a pair of jaws provided at both ends of the core part, and a winding wound around the core part and disposed in a region sandwiched between the pair of jaw parts A coil portion comprising:
A covering portion formed in a region sandwiched between the pair of jaw portions so as to cover the winding, and
The distance between the pair of jaws is 0.15 to 0.80 mm,
The covering portion includes an epoxy resin cured product and ferrite, and the content of the ferrite in the covering portion is 20 to 62.5% by mass with respect to the total amount of the epoxy resin cured product and the ferrite,
The density of the covering portion is 1.3 to 2.2 g / cm ³ .
Coil parts characterized by that.