JP2000260624A - Toroidal ferrite core - Google Patents
Toroidal ferrite coreInfo
- Publication number
- JP2000260624A JP2000260624A JP11065865A JP6586599A JP2000260624A JP 2000260624 A JP2000260624 A JP 2000260624A JP 11065865 A JP11065865 A JP 11065865A JP 6586599 A JP6586599 A JP 6586599A JP 2000260624 A JP2000260624 A JP 2000260624A
- Authority
- JP
- Japan
- Prior art keywords
- height
- ferrite core
- core
- outer diameter
- toroidal ferrite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Coils Or Transformers For Communication (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、トロイダル状のフ
ェライトコアに関するものであり、特に外径の小さい小
物のトロイダル状フェライトコアに関するものである。The present invention relates to a toroidal ferrite core, and more particularly to a small toroidal ferrite core having a small outer diameter.
【0002】[0002]
【従来の技術】フェライトコアは、主に、MnZn系フ
ェライト材料、NiZn系フェライト材料などのソフト
フェライト材料を成形し、焼成して形成され、各種電
気、電子部品等に用いられている。形状、大きさも様々
である。その中で、トロイダル状フェライトコアは、そ
のコアに巻線を施して、コイル、トランス等を構成して
いた。2. Description of the Related Art Ferrite cores are formed by molding and firing soft ferrite materials such as MnZn-based ferrite materials and NiZn-based ferrite materials, and are used for various electric and electronic parts. Shapes and sizes also vary. Among them, the toroidal ferrite core has a winding wound on the core to form a coil, a transformer and the like.
【0003】[0003]
【発明が解決しようとする課題】電気、電子機器等の小
型化にともなって、フェライトコアにも小型の製品が要
求されている。従来のトロイダル状フェライトコアの斜
視図を図3に、中心を通る軸方向に平行な平面で切断し
た断面図を図4に示す。従来のトロイダル状フェライト
コア31は、陵部に小さなアールが形成されているが、
その断面形状は矩形状となっていた。そのため、外径の
小さい小物のトロイダル状フェライトコア31を積み重
ねたり、焼成ケース内にバラ置きして焼成する場合、上
面32、下面33の平面同士が接触し、くっついて焼成
されてしまう。このため、焼成後、くっついたコアを離
す作業が必要であり、又不良品となってしまうといった
不具合が生じていた。With the miniaturization of electric and electronic devices, small products are also required for ferrite cores. FIG. 3 is a perspective view of a conventional toroidal ferrite core, and FIG. 4 is a cross-sectional view taken along a plane passing through the center and parallel to an axial direction. The conventional toroidal ferrite core 31 has a small radius formed on the ridge,
Its cross-sectional shape was rectangular. For this reason, when the small toroidal ferrite cores 31 having a small outer diameter are stacked or placed separately in a firing case and fired, the upper surface 32 and the lower surface 33 come into contact with each other and are fired. For this reason, after the firing, it is necessary to separate the attached cores, and there has been a problem that a defective product is produced.
【0004】本発明は、上記のことを鑑みて、外径の小
さい小物のトロイダル状フェライトコアにおいて、焼成
時のくっつきを防止したトロイダル状フェライトコアを
提供することを目的とする。[0004] In view of the above, it is an object of the present invention to provide a small toroidal ferrite core having a small outer diameter, in which sticking during firing is prevented.
【0005】[0005]
【課題を解決するための手段】本発明は、外径が20m
m以下のトロイダル状フェライトコアにおいて、外径
部、内径部、上面部、下面部で形成される断面形状にお
ける前記上面部及び下面部の形状が、円弧状に突起する
形状となっていることを特徴とするトロイダル状フェラ
イトコアである。According to the present invention, an outer diameter of 20 m is provided.
In the toroidal ferrite core of m or less, the shape of the upper surface and the lower surface in the cross-sectional shape formed by the outer diameter portion, the inner diameter portion, the upper surface portion, and the lower surface portion is a shape protruding in an arc shape. It is a characteristic toroidal ferrite core.
【0006】また本発明は、前記円弧状の突起の突出長
さを1mm以下とするものである。また、0.5mm以
下が好ましく、さらに好ましくは0.3mm以下であ
る。また、0.05mm以上が好ましい。In the present invention, the projection length of the arc-shaped projection is 1 mm or less. Further, it is preferably 0.5 mm or less, more preferably 0.3 mm or less. Further, it is preferably 0.05 mm or more.
【0007】また本発明は、前記円弧状の突起の突出長
さを前記コアの高さの10%以下とするものである。ま
た、5%以下が好ましい。Further, in the present invention, the projection length of the arc-shaped projection is set to 10% or less of the height of the core. Further, it is preferably at most 5%.
【0008】また本発明は、外径が10mm以下のトロ
イダル状フェライトコアにおいて、外径部より内径部が
肉厚であり、その差が1mm以下であることを特徴とす
るトロイダル状フェライトコアである。The present invention also provides a toroidal ferrite core having an outer diameter of 10 mm or less, wherein the inner diameter is thicker than the outer diameter and the difference is 1 mm or less. .
【0009】また本発明は、前記肉厚の変化部は曲率を
有していることを特徴とするものである。Further, the present invention is characterized in that the thickness change portion has a curvature.
【0010】[0010]
【発明の実施の形態】本発明に係る一実施例の一部断面
斜視図を図1に示す。図1は、図4と同様に中心を通る
軸方向に平行な平面で切断した断面を示している。この
実施例のトロイダル状フェライトコア1は、上面2及び
下面3にて、円弧状に突出した形状となっている。この
一例の寸法は、外径が8mm、内径が4mm、高さが4
mmである。尚、高さは、一番高いところの寸法であ
る。このとき、円弧状による突出長さは0.1mmとし
た。尚、この突出長さは、コアの高さに対し、2.5%
である。この突出長さは、図5に示す寸法aである。こ
の形状により、焼成ケースにバラ置きし、焼成したとこ
ろ、トロイダル状フェライトコア同士のくっつきは発生
しなかった。一方、図3、4に示した従来形状の場合、
約10%の発生率で、くっつきが発生した。FIG. 1 is a perspective view, partially in section, of an embodiment according to the present invention. FIG. 1 shows a cross section taken along a plane parallel to an axial direction passing through the center similarly to FIG. The toroidal ferrite core 1 of this embodiment has a shape protruding in an arc shape on the upper surface 2 and the lower surface 3. The dimensions of this example have an outer diameter of 8 mm, an inner diameter of 4 mm, and a height of 4 mm.
mm. The height is the highest dimension. At this time, the protruding length of the arc shape was 0.1 mm. The length of the protrusion is 2.5% of the height of the core.
It is. This protruding length is the dimension a shown in FIG. Due to this shape, when the pieces were placed in a firing case and fired, sticking of the toroidal ferrite cores did not occur. On the other hand, in the case of the conventional shape shown in FIGS.
At an incidence of about 10%, sticking occurred.
【0011】このように、本発明により、くっつきを防
止できることがわかる。この円弧状の突起は、あまり大
きいとその後の使用上問題となる。例えば、突出長さが
長くなればなるほど、コア高さを一定で考えると、コア
の実効断面積が小さくなるため、コアのインダクタンス
が低下してしまう。また突出長さが小さ過ぎると、突出
させる効果が得られなくなる。そのため、突出長さは1
mm以下が好ましく、更に0.5mm以下が好ましく、
更に好ましくは0.3mm以下であり、0.1mm程度
が好ましい。また、0.05mm以上が好ましい。ま
た、この突出長さは、コアの高さに対して10%以下が
好ましく、更に5%以下が好ましく、1〜3%程度が好
ましい。また、この構造は、焼成する際にコアを積み重
ねたり、焼成ケースにバラ置きする外径が20mm以下
の場合に特に有効であり、更に好ましくは、10mm以
下の場合であり、また小さ過ぎても形成し難くなるた
め、2mm以上程度が好ましい。Thus, it can be seen that sticking can be prevented by the present invention. If the arc-shaped projection is too large, it will cause a problem in later use. For example, the longer the protruding length, the more constant the core height, the smaller the effective cross-sectional area of the core, and the lower the inductance of the core. On the other hand, if the projection length is too small, the effect of projecting cannot be obtained. Therefore, the protrusion length is 1
mm or less, more preferably 0.5 mm or less,
It is more preferably 0.3 mm or less, and preferably about 0.1 mm. Further, it is preferably 0.05 mm or more. The protruding length is preferably 10% or less, more preferably 5% or less, and preferably about 1 to 3% with respect to the height of the core. In addition, this structure is particularly effective when the outer diameter of stacking the cores during firing or placing the cores in the firing case loosely is 20 mm or less, more preferably 10 mm or less, and even if it is too small. Since it is difficult to form, it is preferably about 2 mm or more.
【0012】本発明に係る別の実施例の一部断面斜視図
を図2に示す。図2は、図1、4と同様に中心を通る軸
方向に平行な平面で切断した断面を示している。この実
施例のトロイダル状フェライトコア11は、内径部15
が外径部14より肉厚に形成されている。そして、上面
12、下面13は、内径部15に向って徐々に肉厚にな
るように形成され、かつ曲率を有する面となっている。
曲率を有することが好ましいが、直線状であっても良
い。この一例の寸法は、外径が4mm、内径が2mm、
高さが2mmである。尚、高さは、一番高いところの寸
法である。このとき、外径部14と内径部15の高さの
差は0.12mmとした。この形状により、焼成ケース
にバラ置きし、焼成したところ、トロイダル状フェライ
トコア同士のくっつきは発生しなかった。一方、図3、
4に示した従来形状の場合、約6%の発生率で、くっつ
きが発生した。FIG. 2 is a partially sectional perspective view of another embodiment according to the present invention. FIG. 2 shows a cross section taken along a plane parallel to the axial direction passing through the center similarly to FIGS. The toroidal ferrite core 11 of this embodiment has an inner diameter portion 15.
Is formed thicker than the outer diameter portion 14. The upper surface 12 and the lower surface 13 are formed so as to be gradually thicker toward the inner diameter portion 15 and have a curvature.
It preferably has a curvature, but may have a linear shape. The dimensions of this example have an outer diameter of 4 mm, an inner diameter of 2 mm,
Height is 2 mm. The height is the highest dimension. At this time, the difference in height between the outer diameter portion 14 and the inner diameter portion 15 was 0.12 mm. Due to this shape, the toroidal ferrite cores did not stick together when placed in a firing case and fired. On the other hand, FIG.
In the case of the conventional shape shown in FIG. 4, sticking occurred at an occurrence rate of about 6%.
【0013】このように、本発明により、くっつきを防
止できることがわかる。この外径部と内径部の高さの差
は、あまり大きいとその後の使用上問題となる。例え
ば、差が大き過ぎると、コアの実効断面積が小さくな
り、コアのインダクタンスの低下や、成形時の成形密度
ばらつきによる変形が発生する。また、高さの差が小さ
すぎるとその効果が少なく、くっつきが発生する。その
ため、1mm以下が好ましく、更に好ましくは0.5m
m以下であり、又外径部の高さが内径部の高さの90〜
95%程度が好ましい。また、この構造は、図1の実施
例の場合より外径が小さくても対応できる形状である。
従って、外径が10mm以下の場合に特に有効であり、
更に好ましくは、8mm以下の場合であり、更に好まし
くは4mm以下である。Thus, it can be seen that the present invention can prevent sticking. If the difference between the height of the outer diameter portion and the height of the inner diameter portion is too large, there is a problem in later use. For example, if the difference is too large, the effective cross-sectional area of the core becomes small, and the inductance of the core decreases, and deformation due to molding density variation at the time of molding occurs. If the difference in height is too small, the effect is small and sticking occurs. Therefore, it is preferably 1 mm or less, more preferably 0.5 m
m or less, and the height of the outer diameter portion is 90 to 90% of the height of the inner diameter portion.
About 95% is preferable. Further, this structure has a shape that can cope with a case where the outer diameter is smaller than that of the embodiment of FIG.
Therefore, it is particularly effective when the outer diameter is 10 mm or less,
More preferably, it is 8 mm or less, more preferably, 4 mm or less.
【0014】本発明は、トロイダル状フェライトコアの
上面、下面の形状を微少に変更し、焼成時のくっつきを
防止するものである。この形状の変更は、あまり大きい
と、コアの実効断面積が減少し、インダクタンスの低下
を招く、又成形密度ばらつきによる変形のような問題が
生じるが、本発明はそれらの問題を生じること無く、く
っつきを防止できる。また、外径端から内径端の全面に
わたって、上記の突出形状としてもよいし、また一部平
面を設け、他の部分を突出させても良い。この場合、平
面部分は、1/3以下程度とすることが望ましい。According to the present invention, the shapes of the upper and lower surfaces of the toroidal ferrite core are minutely changed to prevent sticking during firing. If the change in shape is too large, the effective area of the core decreases, causing a decrease in inductance, and problems such as deformation due to molding density variation occur, but the present invention does not cause such problems. Sticking can be prevented. In addition, the above-described protruding shape may be formed over the entire surface from the outer diameter end to the inner diameter end, or a partly flat surface may be provided, and another part may be protruded. In this case, it is desirable that the plane portion is about 1/3 or less.
【0015】[0015]
【発明の効果】本発明によれば、小物のトロイダル状フ
ェライトコアにおいて、焼成時のくっつきを防止するこ
とができ、生産性を向上させることができる。According to the present invention, in a small toroidal ferrite core, sticking during firing can be prevented, and productivity can be improved.
【図1】本発明に係る一実施例の一部断面斜視図であ
る。FIG. 1 is a perspective view, partially in section, of an embodiment according to the present invention.
【図2】本発明に係る別の実施例の一部断面斜視図であ
る。FIG. 2 is a partial sectional perspective view of another embodiment according to the present invention.
【図3】従来例の斜視図である。FIG. 3 is a perspective view of a conventional example.
【図4】従来例の一部断面斜視図である。FIG. 4 is a partial cross-sectional perspective view of a conventional example.
【図5】本発明に係る一実施例の説明図である。FIG. 5 is an explanatory diagram of one embodiment according to the present invention.
1、11 トロイダル状フェライトコア 2、12 上面 3、13 下面 14 外径部 15 内径部 1,11 Toroidal ferrite core 2,12 Upper surface 3,13 Lower surface 14 Outer diameter 15 Inner diameter
Claims (5)
ライトコアにおいて、外径部、内径部、上面部、下面部
で形成される断面形状における前記上面部及び下面部の
形状が、円弧状に突起する形状となっていることを特徴
とするトロイダル状フェライトコア。1. In a toroidal ferrite core having an outer diameter of 20 mm or less, the upper surface and the lower surface in a cross-sectional shape formed by an outer diameter portion, an inner diameter portion, an upper surface portion, and a lower surface portion are formed in an arc shape. A toroidal ferrite core characterized in that it has a shape to be formed.
下であることを特徴とする請求項1記載のトロイダル状
フェライトコア。2. The toroidal ferrite core according to claim 1, wherein a projection length of the arc-shaped projection is 1 mm or less.
アの高さの10%以下であることを特徴とする請求項1
記載のトロイダル状フェライトコア。3. A projection length of the arc-shaped projection is not more than 10% of a height of the core.
The toroidal ferrite core as described.
ライトコアにおいて、外径部より内径部が肉厚であり、
その差が1mm以下であることを特徴とするトロイダル
状フェライトコア。4. In a toroidal ferrite core having an outer diameter of 10 mm or less, an inner diameter portion is thicker than an outer diameter portion, and
A toroidal ferrite core having a difference of 1 mm or less.
とを特徴とする請求項4記載のトロイダル状フェライト
コア。5. The toroidal ferrite core according to claim 4, wherein the thickness change portion has a curvature.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP06586599A JP4496508B2 (en) | 1999-03-12 | 1999-03-12 | Toroidal ferrite core |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP06586599A JP4496508B2 (en) | 1999-03-12 | 1999-03-12 | Toroidal ferrite core |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2000260624A true JP2000260624A (en) | 2000-09-22 |
JP4496508B2 JP4496508B2 (en) | 2010-07-07 |
Family
ID=13299332
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP06586599A Expired - Lifetime JP4496508B2 (en) | 1999-03-12 | 1999-03-12 | Toroidal ferrite core |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP4496508B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006165212A (en) * | 2004-12-07 | 2006-06-22 | Sony Corp | Inductance element and its manufacturing process, and wiring board |
JP2010165796A (en) * | 2009-01-14 | 2010-07-29 | Daikin Ind Ltd | Toroidal core, toroidal core case, toroidal coil and controller of air-conditioner |
Citations (10)
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JPS56129305A (en) * | 1980-02-01 | 1981-10-09 | Hasler Ag | Pulse transformer |
JPS56166726U (en) * | 1980-05-13 | 1981-12-10 | ||
JPS61221304A (en) * | 1985-03-28 | 1986-10-01 | Toshiba Corp | Production of sintered parts |
JPH0284306U (en) * | 1988-12-20 | 1990-06-29 | ||
JPH02246105A (en) * | 1989-03-17 | 1990-10-01 | Sumitomo Metal Ind Ltd | Manufacture of ceramic element assembly |
JPH05178672A (en) * | 1991-12-28 | 1993-07-20 | Murata Mfg Co Ltd | Production of ceramics |
JPH05299252A (en) * | 1992-04-22 | 1993-11-12 | Tokin Corp | Surface mounting type choke coil |
JPH0652109U (en) * | 1992-12-21 | 1994-07-15 | ティーディーケイ株式会社 | Coil parts using toroidal core |
JPH08217454A (en) * | 1995-02-15 | 1996-08-27 | Fuji Elelctrochem Co Ltd | Production of manganese-zinc ferrite and calcined powder for manganese-zinc ferrite used therefor |
-
1999
- 1999-03-12 JP JP06586599A patent/JP4496508B2/en not_active Expired - Lifetime
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5637077U (en) * | 1979-08-29 | 1981-04-09 | ||
JPS56129305A (en) * | 1980-02-01 | 1981-10-09 | Hasler Ag | Pulse transformer |
JPS56166726U (en) * | 1980-05-13 | 1981-12-10 | ||
JPS61221304A (en) * | 1985-03-28 | 1986-10-01 | Toshiba Corp | Production of sintered parts |
JPH0284306U (en) * | 1988-12-20 | 1990-06-29 | ||
JPH02246105A (en) * | 1989-03-17 | 1990-10-01 | Sumitomo Metal Ind Ltd | Manufacture of ceramic element assembly |
JPH05178672A (en) * | 1991-12-28 | 1993-07-20 | Murata Mfg Co Ltd | Production of ceramics |
JPH05299252A (en) * | 1992-04-22 | 1993-11-12 | Tokin Corp | Surface mounting type choke coil |
JPH0652109U (en) * | 1992-12-21 | 1994-07-15 | ティーディーケイ株式会社 | Coil parts using toroidal core |
JPH08217454A (en) * | 1995-02-15 | 1996-08-27 | Fuji Elelctrochem Co Ltd | Production of manganese-zinc ferrite and calcined powder for manganese-zinc ferrite used therefor |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006165212A (en) * | 2004-12-07 | 2006-06-22 | Sony Corp | Inductance element and its manufacturing process, and wiring board |
JP4682606B2 (en) * | 2004-12-07 | 2011-05-11 | ソニー株式会社 | Inductance element, manufacturing method thereof, and wiring board |
JP2010165796A (en) * | 2009-01-14 | 2010-07-29 | Daikin Ind Ltd | Toroidal core, toroidal core case, toroidal coil and controller of air-conditioner |
Also Published As
Publication number | Publication date |
---|---|
JP4496508B2 (en) | 2010-07-07 |
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