JPH0456202A - Composite magnetic core - Google Patents
Composite magnetic coreInfo
- Publication number
- JPH0456202A JPH0456202A JP2165587A JP16558790A JPH0456202A JP H0456202 A JPH0456202 A JP H0456202A JP 2165587 A JP2165587 A JP 2165587A JP 16558790 A JP16558790 A JP 16558790A JP H0456202 A JPH0456202 A JP H0456202A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic core
- powder
- magnetic
- core
- permanent magnet
- 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.)
- Pending
Links
- 239000002131 composite material Substances 0.000 title claims abstract description 30
- 239000006247 magnetic powder Substances 0.000 claims abstract description 16
- 239000011810 insulating material Substances 0.000 claims abstract description 11
- 239000000843 powder Substances 0.000 claims description 31
- 229910052751 metal Inorganic materials 0.000 claims description 18
- 239000002184 metal Substances 0.000 claims description 18
- 239000000428 dust Substances 0.000 abstract description 7
- 230000004907 flux Effects 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 3
- 229910000828 alnico Inorganic materials 0.000 abstract description 2
- 229910017052 cobalt Inorganic materials 0.000 abstract description 2
- 239000010941 cobalt Substances 0.000 abstract description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052761 rare earth metal Inorganic materials 0.000 abstract description 2
- 150000002910 rare earth metals Chemical class 0.000 abstract description 2
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 2
- 239000007767 bonding agent Substances 0.000 abstract 1
- 239000011162 core material Substances 0.000 description 74
- 229910000831 Steel Inorganic materials 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000010959 steel Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 229910017061 Fe Co Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000002320 enamel (paints) Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は複合磁心に係り、特に周波数特性が優れ、磁心
を装着する機器の小型化を図ることが可能な複合磁心に
関する。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a composite magnetic core, and in particular to a composite magnetic core that has excellent frequency characteristics and is capable of downsizing equipment in which the magnetic core is installed. .
（従来の技術）
例えば自動車のエンジン点火装置のイグニッションコイ
ルなどに使用される比較的長尺な磁心には、従来、電磁
鋼板の積層体や巻回体が用いられてきた。ところで、イ
グニッションコイルでは高周波励磁が必要とされるが、
従来の電磁鋼板製の磁心は周波数特性が劣るために、以
下に示すような問題があった。(Prior Art) Laminated bodies or wound bodies of electromagnetic steel sheets have conventionally been used for relatively long magnetic cores used, for example, in ignition coils of automobile engine ignition devices. By the way, high frequency excitation is required for ignition coils.
Conventional magnetic cores made of electromagnetic steel sheets have poor frequency characteristics and have the following problems.
すなわち、イグニッヨンコイルに数ＫＨｚ以上の高周波
励磁を行なうと、渦電流損失の増大によって、磁化特性
が低下してしまう。これによって、イグニッションコイ
ルの二次電圧が低下し、ミススパークが発生し易いとい
う問題が生じている。That is, when the ignition coil is subjected to high frequency excitation of several KHz or higher, the magnetization characteristics deteriorate due to an increase in eddy current loss. This causes a problem in that the secondary voltage of the ignition coil decreases and mis-sparking is likely to occur.
また、電磁鋼板の積層体で磁心を形成する場合には、矩
形の電磁鋼板要素を積層する構造であるため、断面が円
形状の磁心を形成することが実質的に困難であり、角形
断面を有するものが使用されている。そのため角形の磁
心にコイルを巻回してイグニッションコイルを形成する
際に、磁心の稜線部にコイルが当接して、切断し易く、
またコイルのエナメル被覆が剥離し易くなるなど巻線性
が極めて低い欠点がある。In addition, when forming a magnetic core with a laminate of electromagnetic steel sheets, since the structure is such that rectangular electromagnetic steel sheet elements are laminated, it is virtually difficult to form a magnetic core with a circular cross section, and it is difficult to form a magnetic core with a circular cross section. What we have is used. Therefore, when winding a coil around a square magnetic core to form an ignition coil, the coil comes into contact with the ridgeline of the magnetic core, making it easy to cut.
Further, there is a drawback that the winding property is extremely low, such as the enamel coating of the coil being easily peeled off.
また断面が角形の磁心は、一般に円筒状の収納容器内に
収納してイグニッションコイル等に形成されるため、磁
心の占積率を大きくとることが困難である。そのため、
製品となるコイル等の容積が増大して、配置スペースの
利用効率が大幅に低下してしまう欠点がある。Further, since a magnetic core having a rectangular cross section is generally housed in a cylindrical container and formed into an ignition coil or the like, it is difficult to increase the space factor of the magnetic core. Therefore,
This has the disadvantage that the volume of the coil, etc. that becomes the product increases, and the efficiency of utilization of the arrangement space decreases significantly.
そこで円柱形状に形成することが容易であり、かつ占積
率を大きく設定することが可能な圧粉磁心が、近年多用
化されている。このような圧粉磁心は、一般に軟磁性粉
と絶縁性を有するバインダとの混合体をプレス成形する
ことによって製造される。Therefore, powder magnetic cores that can be easily formed into a cylindrical shape and have a large space factor have been widely used in recent years. Such powder magnetic cores are generally manufactured by press-molding a mixture of soft magnetic powder and an insulating binder.
このようにして製造された圧粉磁心は占積率を大きく設
定することが可能であるため、比較的に機器を小形に形
成することができる上に、高周波領域においても渦電流
損失が小さい軟磁性粉を使用しているため、周波数特性
が良好となる。Since the powder magnetic core manufactured in this way can have a large space factor, it is possible to make the equipment relatively compact, and it is also a soft core with low eddy current loss even in the high frequency range. Since magnetic powder is used, frequency characteristics are good.
（発明が解決しようとする課題）
しかしながら、従来の圧粉磁心は、一般に磁束密度が低
いため、一定の磁化特性を得るためには容積が大きな圧
粉磁心を形成する必要があり、磁心を使用する機器の小
形軽量化に充分に対応することができないという問題点
があった。(Problem to be solved by the invention) However, since conventional powder magnetic cores generally have low magnetic flux density, it is necessary to form a powder magnetic core with a large volume in order to obtain constant magnetization characteristics. There was a problem in that it was not possible to sufficiently respond to the need for smaller and lighter equipment.
本発明は上記の問題点を解決するためになされたもので
あり、高い周波数特性を保持するとともに、磁心を使用
する機器の小型軽量化を図ることが可能な複合磁心を提
供することを目的とする。The present invention has been made in order to solve the above problems, and its purpose is to provide a composite magnetic core that maintains high frequency characteristics and can reduce the size and weight of devices using the magnetic core. do.
（課題を解決するための手段）
上記目的を達成するため、本発明に係る複合磁心は、軟
磁性粉と絶縁材とから成る柱状の圧粉磁心の少なくとも
一方の端部に永久磁石が装着されていることを特徴とす
る。(Means for Solving the Problems) In order to achieve the above object, a composite magnetic core according to the present invention has a permanent magnet attached to at least one end of a columnar powder magnetic core made of soft magnetic powder and an insulating material. It is characterized by
また、圧粉磁心および永久磁石を金属製外管内に装填し
たり、永久磁石は、金属製外管の開口端に固着して構成
してもよい。Further, the powder magnetic core and the permanent magnet may be loaded into the metal outer tube, or the permanent magnet may be fixed to the open end of the metal outer tube.
（作用）
上記構成に係る複合磁心によれば、高周波数領域におい
ても渦電流損失が小さい軟磁性粉を磁心材料として使用
しているため、周波数特性が良好となる。(Function) According to the composite magnetic core having the above configuration, since soft magnetic powder with low eddy current loss is used as the magnetic core material even in a high frequency region, the frequency characteristics are good.
特に、永久磁石によって予め圧粉磁心に逆磁界が付与さ
れるため、磁心として動作する際の磁束密度Φ変化率（
ΔＢ）を、圧粉磁心単体の場合と比較して大幅に増大さ
せることができる。したがって磁心使用機器の周波数特
性の向上と機器の小型化とを同時に達成することができ
る。In particular, since a permanent magnet applies a reverse magnetic field to the dust core in advance, the rate of change in magnetic flux density Φ (
ΔB) can be significantly increased compared to the case of a single powder magnetic core. Therefore, it is possible to simultaneously improve the frequency characteristics of devices using magnetic cores and downsize the devices.
また圧粉磁心および永久磁石を金属製外管内に装填する
構造とすることにより、金属製外管によって圧粉磁心お
よび永久磁石が保護され、複合磁心全体としての強度特
性を大幅に向上させることができる。さらに軟磁性粉を
充填した金属製外管を転打することにより、所定の円形
断面を有する複合磁心を容易に製造することも可能とな
る。In addition, by adopting a structure in which the powder core and permanent magnets are loaded into a metal outer tube, the powder core and permanent magnets are protected by the metal outer tube, and the strength characteristics of the composite magnetic core as a whole can be greatly improved. can. Furthermore, by rolling a metal outer tube filled with soft magnetic powder, it is possible to easily manufacture a composite magnetic core having a predetermined circular cross section.
（実施例）
次に本発明の一実施例について添付図面を参照して説明
する。、第１図は本発明の一実施例を示す断面図である
。(Example) Next, an example of the present invention will be described with reference to the accompanying drawings. , FIG. 1 is a sectional view showing an embodiment of the present invention.
すなわち本実施例に係る複合磁心１ａは軟磁性粉２ａと
絶縁材３ａとから成る柱状の圧粉磁心４ａの軸方向の一
方の端部に永久磁石５ａを装着して構成される。That is, the composite magnetic core 1a according to this embodiment is constructed by attaching a permanent magnet 5a to one end in the axial direction of a columnar powder magnetic core 4a made of soft magnetic powder 2a and an insulating material 3a.
、上記圧粉磁心４ａは、Ｆｅ粉、Ｆｅ−３ｉ系粉、Ｆｅ
−Ａｌ−５ｉ系粉、Ｆｅ−Ｎｉ系構造、Ｆｅ−Ｃｏ系粉
などの軟磁性粉２ａを、絶縁材３ａである有機系バイン
ダなどによって固定化したものであり、通常プレス成形
などによって形成される。, the powder magnetic core 4a is made of Fe powder, Fe-3i powder, Fe
- Soft magnetic powder 2a such as Al-5i powder, Fe-Ni structure, Fe-Co powder, etc. is fixed with an organic binder as an insulating material 3a, and is usually formed by press molding or the like. Ru.
また永久磁石５ａとしては、Ｓｍ−Ｃｏ系などの希土類
コバルト磁石１．アルニコ磁石やフェライト磁石など磁
力が大きなものが採用され、永久磁石５ａは接着剤等に
よって圧粉磁心４ａの端部に固着される。Moreover, as the permanent magnet 5a, rare earth cobalt magnets such as Sm-Co type magnets 1. A magnet with a large magnetic force, such as an alnico magnet or a ferrite magnet, is used, and the permanent magnet 5a is fixed to the end of the powder magnetic core 4a with an adhesive or the like.
本実施例の複合磁心１ａを構成する圧粉磁心４ａは、軟
磁性粉２ａを囲うように存在する絶縁材３ａに起因して
周波数特性が優れ、高周波数領域においても渦電流損失
が小さいという特性を有している。このことから本実施
例の複合磁心を使用したイグニッションコイルでは、高
周波励磁による二次電圧の低下を抑制することができる
。The powder magnetic core 4a constituting the composite magnetic core 1a of this embodiment has excellent frequency characteristics due to the insulating material 3a that surrounds the soft magnetic powder 2a, and has a characteristic that eddy current loss is small even in the high frequency region. have. Therefore, in the ignition coil using the composite magnetic core of this embodiment, it is possible to suppress a decrease in the secondary voltage due to high frequency excitation.
また、永久磁石５ａによって予め圧粉磁心４ａに逆磁界
が付与されるため、第２図に示すように複合磁心１ａが
磁心として動作する際の磁束密度Ｂの変化率ΔＢ１を、
圧粉磁心単体で構成した従来の磁心の変化率ΔＢＯと比
較して大幅に増大させることができる（本実施例ではΔ
Ｂ、＝２Ｔ＝２０ｋＧ、ΔＢロー１．ＩＴ＝１１ｋＧ）
。そして上記複合磁心１ａでイグニッションコイルを
形成する場合、変化率（ΔＢ、）が大きいほどコイルの
鉄心を小形化することが可能となる。したがって本実施
例の複合磁心１ａによれば、周波数特性の向上と大幅の
小型化とを同時に達成することができる。In addition, since a reverse magnetic field is applied to the powder magnetic core 4a in advance by the permanent magnet 5a, the rate of change ΔB1 of the magnetic flux density B when the composite magnetic core 1a operates as a magnetic core as shown in FIG.
The rate of change ΔBO of a conventional magnetic core composed of a single powder magnetic core can be significantly increased (in this example, ΔBO
B, = 2T = 20kG, ΔB low 1. IT=11kG)
. When an ignition coil is formed using the composite magnetic core 1a, the larger the rate of change (ΔB,) is, the more the core of the coil can be made smaller. Therefore, according to the composite magnetic core 1a of this embodiment, it is possible to simultaneously achieve improvement in frequency characteristics and significant downsizing.
なお、第２実施例として第３図に示すように、圧粉磁心
４ｂの軸方向の両端部にそれぞれ永久磁石５ｂ、５ｂを
装着して複合磁心１ｂを形成した場合についても同様な
作用効果を発揮することができる。In addition, as shown in FIG. 3 as a second embodiment, the same effect can be obtained when a composite magnetic core 1b is formed by attaching permanent magnets 5b, 5b to both axial ends of a powder magnetic core 4b, respectively. able to demonstrate.
また本発明の第３実施例として、第４図に示すように軟
磁性粉２ｃおよび絶縁材３ｃから成る圧粉磁心４ｃと、
その軸方向の両端にそれぞれ装着した永久磁石５ｃ、５
ｃとを金属製外管６ａ内に装填して複合磁心１ｃを形成
することもできる。Further, as a third embodiment of the present invention, as shown in FIG. 4, a powder magnetic core 4c made of soft magnetic powder 2c and an insulating material 3c,
Permanent magnets 5c, 5 attached to both ends in the axial direction, respectively.
It is also possible to form the composite magnetic core 1c by filling the metal outer tube 6a with the composite magnetic core 1c.
ここで、金属製外管６ａとしては、圧粉磁心４Ｃに対す
る巻線を容易とするように、断面が円形状を有するもの
が好ましく、またその材質は、使用用途に応じて適宜選
択するものとする。例えば軟磁性材からなる外管６ａを
用いれば、より磁気特性の向上が図れ、また内部に充填
される軟磁性材とは異なる軟磁性材を用いることによっ
て、中間的な磁気特性を付与することも可能となる。ま
た、ステンレスのような耐蝕性金属材料を用いることに
より、過酷な条件下での使用が可能となり、さらに機械
的強度の向上も図ることができる。Here, the metal outer tube 6a preferably has a circular cross section so as to facilitate winding around the powder magnetic core 4C, and the material thereof may be selected as appropriate depending on the intended use. do. For example, by using the outer tube 6a made of a soft magnetic material, the magnetic properties can be further improved, and by using a soft magnetic material different from the soft magnetic material filled inside, intermediate magnetic properties can be imparted. is also possible. In addition, by using a corrosion-resistant metal material such as stainless steel, it is possible to use it under harsh conditions, and furthermore, it is possible to improve the mechanical strength.
このような複合磁心１ｃは、例えば上記軟磁性粉２ｃと
絶縁材３ｃとの混合体を金属製外管６ａ内に充填し、こ
の外管６ａの外周面をスウエージングマシンなどによっ
て径方向から転打し、外管６ａを所定外径まで縮径し、
外管６ａの両端部開口にそれぞれ永久磁石５ｃ、５ｃを
装填することにより製造される。Such a composite magnetic core 1c is produced by, for example, filling a metal outer tube 6a with a mixture of the soft magnetic powder 2c and an insulating material 3c, and rotating the outer peripheral surface of the outer tube 6a from the radial direction using a swaging machine or the like. to reduce the outer tube 6a to a predetermined outer diameter,
It is manufactured by loading permanent magnets 5c, 5c into the openings at both ends of the outer tube 6a, respectively.
本実施例においても、圧粉磁心４ｃの両端にそれぞれ永
久磁石５ｃ、５ｃが装着されているため、動作時の磁束
密度の変化率ΔＢを増大させることが可能であり、周波
数特性の向上と磁心使用機器の小型化を同時に満足する
ことができる。In this embodiment as well, since the permanent magnets 5c and 5c are attached to both ends of the powder magnetic core 4c, it is possible to increase the rate of change ΔB of the magnetic flux density during operation, improving the frequency characteristics and improving the magnetic core. At the same time, it is possible to reduce the size of the equipment used.
特に本実施例の複合磁心１ｃによれば、軟磁性粉２ｃを
充填した金属製外管６ａを転打することにより、所定の
円形断面を有するように容易に成形することが可能とな
り、磁心の製造コストを大幅に低減できる上に巻線性を
向上させることができる。In particular, according to the composite magnetic core 1c of this embodiment, by rolling the metal outer tube 6a filled with the soft magnetic powder 2c, it is possible to easily form the magnetic core to have a predetermined circular cross section. In addition to being able to significantly reduce manufacturing costs, it is also possible to improve windability.
さらに第４実施例として第５図に示すように軟磁性粉２
ｄおよび絶縁材３ｄの混合物を充填した金属性外管６ｂ
をスウエージングによって断面円形状に縮径して一体化
した後に、金属性外管６ｂの両端開口部に、外管６ｂと
等しい外径を有する永久磁石５ｄ、５ｄをそれぞれ固着
して複合磁心１ｄを形成することもできる。Furthermore, as a fourth embodiment, as shown in FIG.
d and an insulating material 3d.
are reduced in diameter to a circular cross-section by swaging and integrated, and then permanent magnets 5d, 5d having an outer diameter equal to that of the outer tube 6b are respectively fixed to the openings at both ends of the metallic outer tube 6b to form a composite magnetic core 1d. can also be formed.
この場合、金属製外管６ｂを所定寸法毎に切断してその
両端に永久磁石５ｄ、５ｄを固着するだけで製造できる
ため、第３実施例の場合と比較して磁心の製造工程をよ
り簡素化することができる。In this case, the magnetic core can be manufactured by simply cutting the metal outer tube 6b into predetermined dimensions and fixing the permanent magnets 5d, 5d to both ends, so the manufacturing process of the magnetic core is simpler than in the case of the third embodiment. can be converted into
以上説明の通り、本発明に係る複合磁心によれば、高周
波数領域においても渦電流損失か小さい軟磁性構造を磁
心材料として使用しているため、周波数特性が良好とな
る。As explained above, according to the composite magnetic core according to the present invention, since a soft magnetic structure with small eddy current loss is used as the magnetic core material even in a high frequency region, the frequency characteristics are good.
特に、永久磁石によって予め圧粉磁心に逆磁界が付与さ
れるため、磁心として動作する際の磁束密度の変化率（
ΔＢ）を、圧粉磁心単体の場合と比較して大幅に増大さ
せることができる。したがって磁心使用機器の周波数特
性の向上と機器の小型化とを同時に達成することができ
る。In particular, since a permanent magnet applies a reverse magnetic field to the dust core in advance, the rate of change in magnetic flux density (
ΔB) can be significantly increased compared to the case of a single powder magnetic core. Therefore, it is possible to simultaneously improve the frequency characteristics of devices using magnetic cores and downsize the devices.
また圧粉磁心および永久磁石を金属製外管内に装填する
構造とすることにより、金属製外管によって圧粉磁心お
よび永久磁石が保護され、複合磁心金体としての強度特
性を大幅に向上させることができる。さらに軟磁性粉を
充填した金属製外管を転打することにより、所定の円形
断面を有する複合磁心を容易に製造することも可能とな
る。In addition, by adopting a structure in which the powder magnetic core and permanent magnets are loaded into a metal outer tube, the powder magnetic core and permanent magnets are protected by the metal outer tube, and the strength characteristics of the composite magnetic core metal body are greatly improved. I can do it. Furthermore, by rolling a metal outer tube filled with soft magnetic powder, it is possible to easily manufacture a composite magnetic core having a predetermined circular cross section.
第１図は本発明に係る複合磁心の第１実施例を示す断面
図、第２図は本発明に係る複合磁心の磁化曲線を従来例
と比較して示すグラフ、第３図〜第５図はそれぞれ本発
明の第２実施例ないし第４実施例を示す断面図である。
ｌａ、ｌｂ、ｌｃ、 １ｄ・・・複合磁心、２ａ。
２ｂ、２ｃ、２ｄ−・・軟磁性粉、３ａ、 ３ｂ、
３ｃ。
３ ｄ−・・絶縁材、４ａ、４ｂ、４ｃ、４ｄ−・・圧
粉磁心、５ａ、５ｂ、５ｃ、５ｄ−永久磁石、５ａ。
６ｂ・・・金属製外管♂
３ｍ
第４図
５ｃＡFIG. 1 is a sectional view showing a first embodiment of a composite magnetic core according to the present invention, FIG. 2 is a graph showing a magnetization curve of the composite magnetic core according to the present invention in comparison with a conventional example, and FIGS. 3 to 5 These are sectional views showing second to fourth embodiments of the present invention, respectively. la, lb, lc, 1d...composite magnetic core, 2a. 2b, 2c, 2d--soft magnetic powder, 3a, 3b,
3c. 3d--Insulating material, 4a, 4b, 4c, 4d--Powder magnetic core, 5a, 5b, 5c, 5d--Permanent magnet, 5a. 6b...Metal outer tube ♂ 3m Fig. 4 5cA
Claims (3)
くとも一方の端部に永久磁石が装着されていることを特
徴とする複合磁心。1. A composite magnetic core characterized in that a permanent magnet is attached to at least one end of a columnar powder magnetic core made of soft magnetic powder and an insulating material.
形成したことを特徴とする請求項１記載の複合磁心。2. 2. The composite magnetic core according to claim 1, wherein the powder magnetic core and the permanent magnet are loaded into a metal outer tube.
を金属製外管の開口端に固着してなる請求項１記載の複
合磁心。3. 2. The composite magnetic core according to claim 1, wherein the powder magnetic core is loaded into a metal outer tube, and a permanent magnet is fixed to an open end of the metal outer tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2165587A JPH0456202A (en) | 1990-06-26 | 1990-06-26 | Composite magnetic core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2165587A JPH0456202A (en) | 1990-06-26 | 1990-06-26 | Composite magnetic core |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0456202A true JPH0456202A (en) | 1992-02-24 |
Family
ID=15815190
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2165587A Pending JPH0456202A (en) | 1990-06-26 | 1990-06-26 | Composite magnetic core |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0456202A (en) |
-
1990
- 1990-06-26 JP JP2165587A patent/JPH0456202A/en active Pending
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