JP2008085163A - Ferrite core - Google Patents

Ferrite core Download PDF

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JP2008085163A
JP2008085163A JP2006265109A JP2006265109A JP2008085163A JP 2008085163 A JP2008085163 A JP 2008085163A JP 2006265109 A JP2006265109 A JP 2006265109A JP 2006265109 A JP2006265109 A JP 2006265109A JP 2008085163 A JP2008085163 A JP 2008085163A
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ferrite core
leg
yoke
view
notch groove
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JP4893994B2 (en
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Norihiko Kishimoto
徳彦 岸本
Hirokatsu Imashima
啓勝 今嶋
Yutaka Higuchi
豊 樋口
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Proterial Ltd
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Hitachi Metals Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent a pedestal from breaking or a crack from occurring when releasing a mold, in a ferrite core without making a structure of a die complicated. <P>SOLUTION: The ferrite core is integrally constituted of a plurality of pedestals and a yoke for coupling the pedestals. A notched groove having an approximately arcuate cross section with a depth of a fifth or smaller of a thickness of the yoke and a width of a fifth or smaller of a distance between the pedestals is formed along an outer periphery of at least one of the pedestals on the side of the yoke of the pedestal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、トランスやインダクタ等の電子部品に用いられる磁心に関し、特にはソフトフェライトで構成されるフェライトコアに関する。   The present invention relates to a magnetic core used for electronic parts such as a transformer and an inductor, and more particularly to a ferrite core made of soft ferrite.

従来のフェライトコアは、図１５示す様に、複数の脚部２０と前記脚部を連結するヨーク部１５とを一体的に構成してなり、脚部の一方、あるいは両方に巻線を配置し、更に前記フェライトコアと共に磁路を形成する他のフェライトコアを前記脚部と対向配置して、インダクタやトランスなどの電子部品として用いられる。   As shown in FIG. 15, the conventional ferrite core is formed by integrally forming a plurality of leg portions 20 and a yoke portion 15 for connecting the leg portions, and windings are arranged on one or both of the leg portions. Further, another ferrite core that forms a magnetic path together with the ferrite core is disposed opposite to the leg portion and used as an electronic component such as an inductor or a transformer.

一般的にフェライトコアは、酸化第二鉄を含む素原料を所定の組成に秤量し、これを８００℃〜１０００℃程度で仮焼した後、粉砕、造粒してフェライト粉末とし、圧粉成形金型によりプレス成形し、焼結、機械加工して製造される。
図１３は圧粉成形時の状態を説明する図であり、成形装置の金型周辺と成形体を示す断面図である。フェライトコアの成形体１００は、脚部２０を形成する開口とヨーク部１５の外周を形成する開口を備えた筒２１０に、前記脚部を形成する開口内を上下に摺動可能な下パンチ２０５と、前記ヨーク部を形成する開口内を上下に摺動可能な上パンチ２００を配置し、下パンチ２０５、筒２１０に囲まれる領域にフェライト粉末を充填し、上パンチ、下パンチを上下動させて圧粉成形して作製される。なお、脚部２０の内側に位置する部分に他の下パンチを設けて、複数の下パンチで脚部２０とヨーク部１５を形成する場合もある。 Generally, a ferrite core is prepared by weighing raw material containing ferric oxide to a predetermined composition, calcining it at about 800 ° C. to 1000 ° C., pulverizing and granulating it to form a ferrite powder, and compacting. It is manufactured by press molding with a mold, sintering, and machining.
FIG. 13 is a view for explaining a state at the time of compacting, and is a cross-sectional view showing the periphery of the mold of the molding apparatus and the molded body. The ferrite core molded body 100 includes a cylinder 210 having an opening for forming the leg portion 20 and an opening for forming the outer periphery of the yoke portion 15, and a lower punch 205 that can slide up and down in the opening for forming the leg portion. An upper punch 200 that can slide up and down in the opening forming the yoke portion is disposed, ferrite powder is filled in a region surrounded by the lower punch 205 and the cylinder 210, and the upper punch and the lower punch are moved up and down. It is made by compacting. There may be a case where another lower punch is provided at a portion located inside the leg portion 20 and the leg portion 20 and the yoke portion 15 are formed by a plurality of lower punches.

図１４に示すように、加圧成形完了後、下パンチ２０５が上昇し、成形体１００を押し上げ、成形体１００の脚部下面が筒２１０の上面とが同一面とした後、下パンチ２０５が下降して離型されるが、成形体１００は加圧から開放されて僅かに膨張するため、筒２１０から抜き出る際に、脚部外周から内向きにヨーク部に至るクラック１７０が発生する場合があった。
そこで特許文献１のフェライトコアでは、脚部の基部から先端に向かうにしたがって僅かな下り勾配となるテ−パ−を脚部の脚面に設けて構成し、型離の際に生じる脚折れやクラックの発生を防ぐことが提案されている。
特開平９−７８３７号 As shown in FIG. 14, after the press molding is completed, the lower punch 205 is raised to push up the molded body 100, and after the lower surface of the leg portion of the molded body 100 is flush with the upper surface of the cylinder 210, the lower punch 205 is When the molded body 100 is released from the pressure and expands slightly, the crack 170 that extends from the outer periphery of the leg portion to the yoke portion is generated when the molded body 100 is extracted from the tube 210. was there.
Therefore, in the ferrite core of Patent Document 1, a taper having a slight downward slope as it goes from the base portion of the leg portion toward the tip is provided on the leg surface of the leg portion, and leg breaks and cracks that occur during mold release are formed. It has been proposed to prevent the outbreak.
JP-A-9-7837

特許文献１に開示された方法では、テ−パ−を形成するために生じる、下パンチと筒との間の隙間に位置する第２の下パンチが必要となり、脚部の形状が矩形や円形などの単純形状であっても、金型の構造が複雑なものとなる。また、フェライトコアが小型で、脚部の形状が複雑となれば金型の作製そのものが困難となる。
また、ヨーク部の前記脚部と連なる領域は、他の薄肉部に比べて、成形密度が低下しやすい傾向にある。このような部分的な成形密度の低下もクラックの発生を誘発するが、従来技術においては前記領域の成形密度を増すことも出来ないため、クラックの発生を改善するまでには到っていない。
そこで本発明では、金型の構造を複雑なものとすることなく、フェライトコアにおいて型離の際に生じる脚折れやクラックの発生を防ぐことを目的とする。 The method disclosed in Patent Document 1 requires a second lower punch that is formed in the gap between the lower punch and the cylinder, which is generated to form the taper, and the shape of the leg portion is rectangular or circular. Even if the shape is simple, the structure of the mold becomes complicated. In addition, if the ferrite core is small and the shape of the leg is complicated, it is difficult to manufacture the mold.
Moreover, the area | region which continues with the said leg part of a yoke part exists in the tendency for a shaping | molding density to fall easily compared with another thin part. Such a partial decrease in the molding density also induces the generation of cracks, but in the prior art, the molding density in the region cannot be increased, so that the generation of cracks has not been improved.
Therefore, an object of the present invention is to prevent the occurrence of leg breaks and cracks that occur at the time of mold release in a ferrite core without complicating the mold structure.

第１の発明は、複数の脚部と前記脚部を連結するヨーク部とを一体的に構成したフェライトコアであって、脚部のヨーク部側には、少なくとも一つの脚部外周に沿って形成された切り欠き溝を備えたフェライトコアである。   1st invention is the ferrite core which comprised integrally the some leg part and the yoke part which connects the said leg part, Comprising: At least one leg part outer periphery is provided in the yoke part side of a leg part. It is a ferrite core provided with a notch groove formed.

第２の発明は、複数の脚部と前記脚部を連結するヨーク部とを一体的に構成したフェライトコアであって、前記ヨーク部の前記脚部を有さない面側には、少なくとも一つの脚部の外周に対応する対向位置の内側に形成された切り欠き溝を備えたフェライトコアである。   According to a second aspect of the present invention, there is provided a ferrite core in which a plurality of legs and a yoke part that connects the legs are integrally formed, and at least one surface of the yoke part that does not have the legs is provided. It is a ferrite core provided with the notch groove formed inside the opposing position corresponding to the outer periphery of one leg part.

フェライトコアが大きな形状であれば、切り欠き溝の形成寸法は、それに従い大きな寸法を採用することが出来るが、切り欠き溝はヨーク部の断面積を減少させ、機械的強度を低下させる。また漏れ磁束を生じさせ磁気特性を低下させる場合がある。これらを考えあわせて、深さはヨーク部の厚みの１／５以下であり、幅は脚部間距離の１／５以下とするのが好ましい。ここで脚部間距離は、隣り合う脚部の周縁の最短間隔として定義される。
ヨーク部の厚みが０．５ｍｍ〜２ｍｍ、脚部間距離が２ｍｍ〜５ｍｍ程度の小型のフェライトコアである場合には、前記切り欠き溝は、深さが０．０５ｍｍ〜０．２０ｍｍであり、幅が０．１ｍｍ〜０．５ｍｍであるのが好ましい。 If the ferrite core has a large shape, the notch groove can be formed with a larger dimension accordingly, but the notch groove reduces the cross-sectional area of the yoke portion and lowers the mechanical strength. In addition, leakage magnetic flux may be generated and the magnetic characteristics may be deteriorated. Considering these, it is preferable that the depth is 1/5 or less of the thickness of the yoke part and the width is 1/5 or less of the distance between the leg parts. Here, the distance between leg portions is defined as the shortest interval between the peripheral edges of adjacent leg portions.
When the yoke portion is a small ferrite core having a thickness of 0.5 mm to 2 mm and a distance between legs of about 2 mm to 5 mm, the notch groove has a depth of 0.05 mm to 0.20 mm. The width is preferably 0.1 mm to 0.5 mm.

第１の発明、第２の発明のそれぞれにおいて、前記切り欠き溝は前記ヨーク部の脚部が形成される面側及び前記脚部を有さない面側の両面に設けても良い。   In each of the first invention and the second invention, the notch groove may be provided on both the surface side where the leg portion of the yoke portion is formed and the surface side where the leg portion is not provided.

切り欠き溝は筒の上面や下パンチ及び／又は上パンチに一体的に設けられた突状部により形成される。前記切り欠き溝の断面視形状は、下パンチや筒及び／又は上パンチの加工可能な形状であれば特には限定されないが、一般的に金型は、耐磨耗性、靭性等の観点から超鋼合金が用いられる場合が多い。超鋼合金の加工には放電加工が用いられる場合が多いから、電極加工が容易な略円弧形状や台形等の形状とするのが好ましい。
金型に設けられた突状部により、成形時に例えば筒に設けられた突状部から上パンチへと、ヨーク部の前記脚部と連なる領域にも圧力が伝播し、前記領域の成形密度が上昇し機械的強度を向上させる。このため、抜きテーパを設け無くても、脚部外周から内向きにヨーク部に至るクラックが発生するのを防ぐことが出来る。 The notch groove is formed by a protruding portion provided integrally with the upper surface of the cylinder, the lower punch and / or the upper punch. The cross-sectional shape of the notch groove is not particularly limited as long as it is a shape that can be processed by a lower punch, a cylinder, and / or an upper punch, but in general, a mold is from the viewpoint of wear resistance, toughness, and the like. Super steel alloys are often used. Since electric discharge machining is often used for machining the super steel alloy, it is preferable to use a substantially arc shape or trapezoidal shape that facilitates electrode machining.
Due to the protrusions provided on the mold, for example, pressure is propagated from the protrusions provided on the cylinder to the upper punch at the time of molding to the area connected to the leg part of the yoke part, and the molding density of the area is reduced. Increases and improves mechanical strength. For this reason, it is possible to prevent the occurrence of cracks extending from the outer periphery of the leg portion to the yoke portion inwardly without providing a draft taper.

本発明によれば、金型の構造を複雑なものとすることなく、フェライトコアにおいて型離の際に生じる脚折れやクラックの発生を防ぐことが出来る。   According to the present invention, it is possible to prevent leg breaks and cracks occurring at the time of mold release in the ferrite core without complicating the structure of the mold.

以下、図面に基づいて本発明のフェライトコアについて説明する。
図１（ａ）本発明に係るＵ字型フェライトコアの正面図であり、（ｂ）はそのａ−ａ‘断面図である。これらの図面において、フェライトコアは、ヨ−ク部１５の一面からこのヨ−ク部１５に直角に突出する一対の脚部２０とがフエライト粉末で一体に形成されたＵ字形フェライトコアである。平面視円形状の脚部２０のヨーク部側には、脚部外周に沿って環状に切り欠き溝が形成されている。 Hereinafter, the ferrite core of the present invention will be described with reference to the drawings.
FIG. 1A is a front view of a U-shaped ferrite core according to the present invention, and FIG. In these drawings, the ferrite core is a U-shaped ferrite core in which a pair of leg portions 20 projecting from the one surface of the yoke portion 15 at a right angle to the yoke portion 15 are integrally formed of ferrite powder. On the yoke part side of the leg part 20 having a circular shape in plan view, an annular notch groove is formed along the outer periphery of the leg part.

図１１及び図１２は、切り欠き溝の拡大断面図である。断面形状については特に限定されるものでは無いが、ヨーク部の脚部と連なる領域に圧力が伝播し易いように、切り欠き溝の底部側ほど開口面積が狭くなるような形状とするのが好ましい。そこで、それぞれ略円弧形状、台形形状に形成している。
本実施例ではヨーク部の厚みが１．０ｍｍであり、脚部間距離を３．４ｍｍとし、切り欠き溝をそれぞれ深さｔ０．１ｍｍ、幅ａ０．３５ｍｍとしたフェライトコアとした（第１実施例）。比較例として切り欠き溝を形成しない以外は、実施例と同一形状のフェライトコアを５０ケ作製し、一対の脚部を横断するように、脚部の略中央部を切断してヨーク部の脚部と連なる領域に発生するクラックについて、光学顕微鏡にてクラックの有無を確認した。
その結果、比較例のフェライトコアでは微小なクラックを含めると、約２０％のフェライトコアにクラックが発生していた。また、クラックの表面を走査型電子顕微鏡で詳細に観察したところ、その面状態はフェライト結晶の粒内や、粒界が現れたものではなく、フェライトコアの外表面の面状態と良く似た状態であった。このことから、前記クラックは焼結前に発生したものであると推察される。一方の本発明のフェライトコアにはクラックは観察されなかった。 FIG.11 and FIG.12 is an expanded sectional view of a notch groove. The cross-sectional shape is not particularly limited, but it is preferable that the opening area be narrower toward the bottom side of the notch groove so that the pressure can easily propagate to the region connected to the leg portion of the yoke portion. . Therefore, they are formed in a substantially arc shape and a trapezoidal shape, respectively.
In this embodiment, a ferrite core having a yoke portion thickness of 1.0 mm, a leg-to-leg distance of 3.4 mm, and a notch groove having a depth t0.1 mm and a width a0.35 mm, respectively (first embodiment) Example). As a comparative example, except that notch grooves are not formed, 50 ferrite cores having the same shape as those of the example are manufactured, and substantially central portions of the leg portions are cut so as to cross the pair of leg portions, and the leg of the yoke portion is formed. About the crack which generate | occur | produces in the area | region connected with a part, the presence or absence of the crack was confirmed with the optical microscope.
As a result, in the ferrite core of the comparative example, cracks were generated in about 20% of the ferrite cores including a minute crack. In addition, when the surface of the cracks was observed in detail with a scanning electron microscope, the surface state was not similar to the surface state of the outer surface of the ferrite core, and the surface state did not appear within the ferrite crystal grains or grain boundaries. Met. From this, it is surmised that the cracks occurred before sintering. On the other hand, no crack was observed in the ferrite core of the present invention.

図２（ａ）（ｂ）に示すフェライトコアは本発明に係るＵ字型フェライトコア（第２実施例）である。図２（ａ）はその正面図であり、（ｂ）はａ−ａ‘断面図である。これらの図面において、フェライトコアは、ヨ−ク部１５の一面からこのヨ−ク部１５に直角に突出する一対の脚部２０とがフエライト粉末で一体に形成されたＵ字形フェライトコアである。ヨーク部の脚部を有さない面側には、平面視円形状の脚部の外周に対応する対向位置の内側、即ち、脚部と平面視方向に重なるヨーク部の領域に環状の切り欠き溝が形成されている。
成形時に上パンチに設けられた突状部から筒へと、ヨーク部の前記脚部と連なる領域にも圧力が伝播し、前記領域の成形密度が上昇し機械的強度を向上させる。このため、第１実施例と同様に、抜きテーパを設け無くても、脚部外周から内向きにヨーク部に至るクラックが発生するのを防ぐことが出来る。
なお一つのフェライトコアにおいて、ヨーク部の脚部側と脚部を有さない面側に、それぞれ切り欠き溝を形成しても良い。この場合、一つの脚部に対して両面に切り欠き溝を形成したり、脚部に応じてヨーク部の脚部側に形成したり、脚部を有さない面側形成したりする。 The ferrite core shown in FIGS. 2A and 2B is a U-shaped ferrite core (second embodiment) according to the present invention. FIG. 2A is a front view thereof, and FIG. 2B is an aa ′ sectional view. In these drawings, the ferrite core is a U-shaped ferrite core in which a pair of leg portions 20 projecting from the one surface of the yoke portion 15 at a right angle to the yoke portion 15 are integrally formed of ferrite powder. On the surface side of the yoke portion that does not have the leg portion, an annular cutout is formed on the inner side of the opposing position corresponding to the outer periphery of the leg portion that is circular in plan view, that is, in the region of the yoke portion that overlaps the leg portion in plan view Grooves are formed.
Pressure is propagated also from the projecting portion provided on the upper punch to the tube during molding to a region connected to the leg portion of the yoke portion, and the molding density of the region is increased to improve the mechanical strength. For this reason, similarly to the first embodiment, it is possible to prevent the crack from reaching the yoke portion from the outer periphery of the leg portion inwardly without providing the draft taper.
In one ferrite core, a notch groove may be formed on the leg side of the yoke part and on the surface side not having the leg part. In this case, a notch groove is formed on both sides of one leg part, or the leg part is formed on the leg part side of the yoke part according to the leg part, or the surface side not having the leg part is formed.

図３（ａ）（ｂ）に示すフェライトコアは本発明に係るＵ字型フェライトコア（第３実施例）である。図３（ａ）はその正面図であり、（ｂ）はａ−ａ‘断面図である。これらの図面において、フェライトコアは、ヨ−ク部１５の一面からこのヨ−ク部１５に直角に突出する一対の脚部２０とがフエライト粉末で一体に形成されたＵ字形フェライトコアである。
第１実施例とは、脚部２０の一部の外周が、ヨーク部１５の外周よりも外側に位置するように配置され、平面視扁平円形状の脚部２０のヨーク部側に、脚部外周に沿って切り欠き溝１０が形成されている点で異なる。本実施例においても、フェライトコアにはクラックは観察されなかった。 The ferrite core shown in FIGS. 3 (a) and 3 (b) is a U-shaped ferrite core (third embodiment) according to the present invention. FIG. 3A is a front view thereof, and FIG. 3B is an aa ′ sectional view. In these drawings, the ferrite core is a U-shaped ferrite core in which a pair of leg portions 20 projecting from the one surface of the yoke portion 15 at a right angle to the yoke portion 15 are integrally formed of ferrite powder.
The first embodiment is arranged such that a part of the outer periphery of the leg portion 20 is positioned outside the outer periphery of the yoke portion 15, and the leg portion is disposed on the yoke portion side of the flat circular leg portion 20 in plan view. The difference is that a notch groove 10 is formed along the outer periphery. Also in this example, no crack was observed in the ferrite core.

図４（ａ）（ｂ）に示すフェライトコアは本発明に係るＵ字型フェライトコア（第４実施例）である。図４（ａ）はその正面図であり、（ｂ）はａ−ａ‘断面図である。第３実施例との相違点は、ヨーク部の脚部を有さない面側には、脚部の外周に対応する対向位置の内側に切り欠き溝が形成されている点である。なお本実施例においては、脚部２０の一部の外周が、ヨーク部１５の外周よりも外側に位置するように配置されているため、ヨーク部１５の外周よりも外側は、段差状に形成されている。本実施例においても、フェライトコアにはクラックは観察されなかった。   The ferrite core shown in FIGS. 4A and 4B is a U-shaped ferrite core (fourth embodiment) according to the present invention. FIG. 4A is a front view thereof, and FIG. 4B is an a-a ′ sectional view. The difference from the third embodiment is that a notch groove is formed inside the opposing position corresponding to the outer periphery of the leg portion on the surface side of the yoke portion not having the leg portion. In this embodiment, since the outer periphery of a part of the leg portion 20 is disposed outside the outer periphery of the yoke portion 15, the outer side of the outer periphery of the yoke portion 15 is formed in a stepped shape. Has been. Also in this example, no crack was observed in the ferrite core.

図５（ａ）（ｂ）に示すフェライトコアは本発明に係るＵ字型フェライトコア（第５実施例）である。図５（ａ）はその正面図であり、（ｂ）はａ−ａ‘断面図である。
本実施例のフェライトコアでは、第１脚部２０の一部の外周が、ヨーク部１５の外周よりも外側に位置するように配置され、第２脚部２０の一部の外周が、ヨーク部１５の外周と同じに形成され、平面視円形状の第１脚部２０及び第２脚部２０のヨーク部側に、脚部外周に沿って切り欠き溝１０が形成されている。第２脚部２０は円弧状に形成され、その中心軸は、第１脚部の中心軸と異なるようにしている。またヨーク部も第２脚部２０と中心軸を同じくする円弧状に形成されている点で、他の実施例と異なるが、本実施例においても、フェライトコアにはクラックは観察されなかった。 The ferrite core shown in FIGS. 5A and 5B is a U-shaped ferrite core (fifth embodiment) according to the present invention. FIG. 5A is a front view thereof, and FIG. 5B is an aa ′ sectional view.
In the ferrite core of the present embodiment, a part of the outer periphery of the first leg portion 20 is disposed so as to be located outside the outer periphery of the yoke portion 15, and a part of the outer periphery of the second leg portion 20 is disposed in the yoke portion. A notch groove 10 is formed along the outer periphery of the leg portion on the yoke portion side of the first leg portion 20 and the second leg portion 20 that are formed in the same manner as the outer periphery of the first leg portion 20 and have a circular shape in plan view. The 2nd leg part 20 is formed in circular arc shape, The center axis | shaft is made to differ from the center axis | shaft of a 1st leg part. Further, although the yoke part is also formed in an arc shape having the same central axis as the second leg part 20, cracks were not observed in the ferrite core in this example, though it was different from the other examples.

図６（ａ）（ｂ）に示すフェライトコアは本発明に係るＵ字型フェライトコア（第６実施例）である。図６（ａ）はその正面図であり、（ｂ）はａ−ａ‘断面図である。
本実施例のフェライトコアでは、脚部２０が略矩形状に形成されている点で、他の実施例と異なるが、本実施例においてもフェライトコアにはクラックは観察されなかった。 The ferrite core shown in FIGS. 6A and 6B is a U-shaped ferrite core (sixth embodiment) according to the present invention. FIG. 6A is a front view thereof, and FIG. 6B is an aa ′ sectional view.
The ferrite core of this example differs from the other examples in that the legs 20 are formed in a substantially rectangular shape, but no cracks were observed in the ferrite core in this example.

図７（ａ）（ｂ）に示すフェライトコアは本発明に係るＥ字型フェライトコア（第７実施例）である。図７（ａ）はその正面図であり、（ｂ）はａ−ａ‘断面図である。
本実施例のフェライトコアでは、２つの外脚部２０の間に位置するように、中脚部２５を配置し、それぞれの脚部２０、２５のヨーク部側に、脚部外周に沿って切り欠き溝１０が形成されている点で異なるが、本実施例においてもフェライトコアにはクラックは観察されなかった。 The ferrite core shown in FIGS. 7A and 7B is an E-shaped ferrite core (seventh embodiment) according to the present invention. FIG. 7A is a front view thereof, and FIG. 7B is an aa ′ sectional view.
In the ferrite core of the present embodiment, the middle leg portion 25 is disposed so as to be positioned between the two outer leg portions 20, and cut along the outer circumference of the leg portion on the yoke portion side of each leg portion 20, 25. Although different in that the notch 10 is formed, no cracks were observed in the ferrite core in this example.

図８（ａ）（ｂ）に示すフェライトコアは本発明に係るＥ字型フェライトコア（第８実施例）である。図８（ａ）はその正面図であり、（ｂ）はａ−ａ‘断面図である。
本実施例のフェライトコアは第７実施例とは、ヨーク部の脚部を有さない面側に、脚部の外周に対応する対向位置の内側の領域に切り欠き溝が形成されている点で異なるが、本実施例においてもフェライトコアにクラックは観察されなかった。 The ferrite core shown in FIGS. 8A and 8B is an E-shaped ferrite core (eighth embodiment) according to the present invention. FIG. 8A is a front view thereof, and FIG. 8B is an aa ′ sectional view.
The ferrite core of the present embodiment is different from the seventh embodiment in that a notch groove is formed in a region inside the opposing position corresponding to the outer periphery of the leg portion on the surface side having no leg portion of the yoke portion. However, no cracks were observed in the ferrite core even in this example.

図９（ａ）（ｂ）に示すフェライトコアは本発明に係るＥ字型フェライトコア（第９実施例）である。図９（ａ）はその正面図であり、（ｂ）はａ−ａ‘断面図である。
本実施例のフェライトコアは第７実施例とは、２つの外脚部２０の外周の一部が、中脚部２５に配置されるコイルボビンの外形と干渉しない様に、くびれて形成される点で異なるが、本実施例においてもフェライトコアにクラックは観察されなかった。 The ferrite core shown in FIGS. 9A and 9B is an E-shaped ferrite core (9th embodiment) according to the present invention. FIG. 9A is a front view thereof, and FIG. 9B is an aa ′ sectional view.
The ferrite core of this embodiment is different from the seventh embodiment in that it is constricted so that a part of the outer periphery of the two outer legs 20 does not interfere with the outer shape of the coil bobbin disposed on the middle leg 25. However, no cracks were observed in the ferrite core even in this example.

図１０（ａ）（ｂ）に示すフェライトコアは本発明に係るＥＰ型フェライトコア（第１０実施例）である。図１０（ａ）はその正面図であり、（ｂ）はａ−ａ‘断面図である。
本実施例のフェライトコアは他の実施例とは、外脚部２０が中脚部２０の外周を囲うように形成される点で異なるが、本実施例においてもフェライトコアにクラックは観察されなかった。
以上、具体的な形状を例に実施例を説明したが、本発明はこれら実施例に限定されるものでは無く、複数の脚部と前記脚部を連結するヨーク部とを一体的に構成したフェライトコアであって、脚部のヨーク部側や前記ヨーク部の前記脚部を有さない面側に、切り欠き溝を備えたフェライトコアであれば、その効果を発揮するものであり、他の形状としては、ＬＰ形状、ＰＯＴ形状、ＥＰＸ形状、ＰＱ形状、ＲＭ形状、ＥＣ形状、ＥＰＣ形状、Ｘ形状、ＰＮ形状などが例示され、またＪＩＳ、電子材料工業会が規定する標準形状に含まれない形状であってもかまわない。 The ferrite core shown in FIGS. 10A and 10B is an EP type ferrite core (tenth embodiment) according to the present invention. FIG. 10A is a front view thereof, and FIG. 10B is an aa ′ sectional view.
The ferrite core of this embodiment is different from the other embodiments in that the outer leg portion 20 is formed so as to surround the outer periphery of the middle leg portion 20, but no cracks are observed in the ferrite core in this embodiment. It was.
The embodiments have been described with specific shapes as examples. However, the present invention is not limited to these embodiments, and a plurality of leg portions and a yoke portion that connects the leg portions are integrally configured. If it is a ferrite core and has a notch groove on the yoke part side of the leg part or the surface side of the yoke part that does not have the leg part, the effect is exhibited. Examples of shapes include LP shape, POT shape, EPX shape, PQ shape, RM shape, EC shape, EPC shape, X shape, PN shape, etc., and are included in the standard shapes prescribed by JIS and Electronic Materials Industry Association It does not matter if the shape is not suitable.

本発明のフェライトコアによれば、金型の構造を複雑なものとすることなく、フェライトコアにおいて型離の際に生じる脚折れやクラックの発生を防ぐことが出来る。   According to the ferrite core of the present invention, it is possible to prevent the occurrence of leg breaks and cracks that occur during mold separation in the ferrite core without complicating the structure of the mold.

（ａ）本発明の一実施例に係るフェライトコアの正面図、（ｂ）断面図である。(A) It is a front view of the ferrite core which concerns on one Example of this invention, (b) It is sectional drawing. （ａ）本発明の他の実施例に係るフェライトコアの正面図、（ｂ）断面図である。(A) It is a front view of the ferrite core which concerns on the other Example of this invention, (b) It is sectional drawing. （ａ）本発明の他の実施例に係るフェライトコアの正面図、（ｂ）断面図である。(A) It is a front view of the ferrite core which concerns on the other Example of this invention, (b) It is sectional drawing. （ａ）本発明の他の実施例に係るフェライトコアの正面図、（ｂ）断面図である。(A) It is a front view of the ferrite core which concerns on the other Example of this invention, (b) It is sectional drawing. （ａ）本発明の他の実施例に係るフェライトコアの正面図、（ｂ）断面図である。(A) It is a front view of the ferrite core which concerns on the other Example of this invention, (b) It is sectional drawing. （ａ）本発明の他の実施例に係るフェライトコアの正面図、（ｂ）断面図である。(A) It is a front view of the ferrite core which concerns on the other Example of this invention, (b) It is sectional drawing. （ａ）本発明の他の実施例に係るフェライトコアの正面図、（ｂ）断面図である。(A) It is a front view of the ferrite core which concerns on the other Example of this invention, (b) It is sectional drawing. （ａ）本発明の他の実施例に係るフェライトコアの正面図、（ｂ）断面図である。(A) It is a front view of the ferrite core which concerns on the other Example of this invention, (b) It is sectional drawing. （ａ）本発明の他の実施例に係るフェライトコアの正面図、（ｂ）断面図である。(A) It is a front view of the ferrite core which concerns on the other Example of this invention, (b) It is sectional drawing. （ａ）本発明の他の実施例に係るフェライトコアの正面図、（ｂ）断面図である。(A) It is a front view of the ferrite core which concerns on the other Example of this invention, (b) It is sectional drawing. 本発明の一実施例に係るフェライトコアに設けられた切り欠き溝の断面図である。It is sectional drawing of the notch groove provided in the ferrite core which concerns on one Example of this invention. 本発明の他の実施例に係るフェライトコアに設けられた切り欠き溝の断面図である。It is sectional drawing of the notch groove provided in the ferrite core which concerns on the other Example of this invention. フェライトコアの成形工程を説明するための図である。It is a figure for demonstrating the formation process of a ferrite core. フェライトコアのクラックが発生する要因を説明するための図である。It is a figure for demonstrating the factor which the crack of a ferrite core generate | occur | produces. （ａ）従来のフェライトコアの正面図、（ｂ）断面図である。(A) Front view of conventional ferrite core, (b) Cross-sectional view.

符号の説明Explanation of symbols

１ フェライトコア
１０ 切り欠き溝
１５ ヨーク部
２０、２５ 脚部 1 Ferrite core 10 Notch groove 15 Yoke part 20, 25 Leg part

Claims (5)

複数の脚部と前記脚部を連結するヨーク部とを一体的に構成したフェライトコアであって、脚部のヨーク部側には、少なくとも一つの脚部外周に沿って形成された切り欠き溝を備えたことを特徴とするフェライトコア。   A ferrite core in which a plurality of leg portions and a yoke portion connecting the leg portions are integrally configured, and a notch groove formed along the outer periphery of at least one leg portion on the yoke portion side of the leg portion A ferrite core characterized by comprising: 複数の脚部と前記脚部を連結するヨーク部とを一体的に構成したフェライトコアであって、前記ヨーク部の前記脚部を有さない面側には、少なくとも一つの脚部の外周に対応する対向位置の内側に形成された切り欠き溝を備えたことを特徴とするフェライトコア。   A ferrite core in which a plurality of leg portions and a yoke portion connecting the leg portions are integrally formed, and on the surface side of the yoke portion that does not have the leg portions, on the outer periphery of at least one leg portion. A ferrite core comprising a notch groove formed inside a corresponding facing position. 前記切り欠き溝は、深さがヨーク部の厚みの１／５以下であり、幅は脚部間距離の１／５以下であることを特徴とする請求項１又は２に記載のフェライトコア。   3. The ferrite core according to claim 1, wherein the notch groove has a depth of 1/5 or less of a thickness of the yoke portion and a width of 1/5 or less of a distance between the leg portions. 前記切り欠き溝は、深さが０．０５ｍｍ〜０．２０ｍｍであり、幅が０．１ｍｍ〜０．５ｍｍであることを特徴とする請求項１又は２に記載のフェライトコア。   The ferrite core according to claim 1, wherein the notch groove has a depth of 0.05 mm to 0.20 mm and a width of 0.1 mm to 0.5 mm. 前記切り欠き溝は、断面視略円弧形状であることを特徴とする請求項１乃至４のいずれかに記載のフェライトコア。   The ferrite core according to any one of claims 1 to 4, wherein the notch groove has a substantially arc shape in a sectional view.
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JPS62151717A (en) * 1985-12-26 1987-07-06 Sharp Corp Light applied sensor
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