JPS6068608A - High frequency choke coil - Google Patents
High frequency choke coilInfo
- Publication number
- JPS6068608A JPS6068608A JP58176263A JP17626383A JPS6068608A JP S6068608 A JPS6068608 A JP S6068608A JP 58176263 A JP58176263 A JP 58176263A JP 17626383 A JP17626383 A JP 17626383A JP S6068608 A JPS6068608 A JP S6068608A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic core
- winding
- split
- choke coil
- 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
- 238000004804 winding Methods 0.000 claims abstract description 28
- 229920005989 resin Polymers 0.000 claims description 11
- 239000011347 resin Substances 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 2
- 239000000696 magnetic material Substances 0.000 abstract description 11
- 230000004907 flux Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 abstract description 2
- 239000000758 substrate Substances 0.000 abstract 2
- 230000002787 reinforcement Effects 0.000 abstract 1
- 239000006247 magnetic powder Substances 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000714 At alloy Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910017082 Fe-Si Inorganic materials 0.000 description 1
- 229910017133 Fe—Si Inorganic materials 0.000 description 1
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 description 1
- 229910003296 Ni-Mo Inorganic materials 0.000 description 1
- 229910001035 Soft ferrite Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明は、軟質磁性材料から成る環状磁心に巻線を施し
た高周波チョークコイルに関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a high frequency choke coil in which a wire is wound around an annular magnetic core made of a soft magnetic material.
各種の通信機器、情報処理機器とその周辺機器、事務機
器、計装機器、制御機器等の゛ａ子機器にはそれらの電
源、および信号の入出力回路を中心に多くの高周波フィ
ルターが用いられている。Many high-frequency filters are used mainly in power supplies and signal input/output circuits for a variety of communication equipment, information processing equipment and its peripheral equipment, office equipment, instrumentation equipment, control equipment, and other sub-devices. ing.
これらの高周波フィルターに用いられる高周波チョーク
コイルは概略第１図に示す構成となっている。すなわち
、ダストコアやフェライトコア等の軟質磁性材料から成
る環状磁心】に巻線２が施され、その端子３が設けられ
ている。The high-frequency choke coil used in these high-frequency filters has a configuration roughly shown in FIG. That is, a winding 2 is wound around an annular magnetic core made of a soft magnetic material such as a dust core or a ferrite core, and terminals 3 are provided thereon.
この構成のチョークコイルは外部へのｒｈ６洩磁束が少
ないという特徴を持っているが１巻線は専用の巻線機で
複雑な工程を必要とし、また非常に小さな磁心音用いる
場合は機械巻線が不可能になる場合もあった。A choke coil with this configuration has the characteristic of having little rh6 leakage flux to the outside, but the first winding requires a complicated process using a dedicated winding machine, and when using a very small magnetic core noise, mechanical winding is required. In some cases, this became impossible.
さらに第１図に示した構成のｆ、ｇ−クコイルはプリン
ト基板へ取付ける際、巻線２の部分を基板へ樹脂等で接
着するか端子３を接続して固定する方法がとられている
。しかし前者の場合は、巻線でチョークコイルを支えて
いるため、巻線の変形や、細いリッツ線を用いた場合の
断線の問題があり、さらにプリント基板への接着の際の
樹脂量のバラツキなどにより、取付後のチョークコイル
インダクタンスのイ１６のバラツキが大きいという問題
があった。一方巻椋３で取付ける場・合は、振動をうけ
る環境での使用に問題があり、かつリッツ線での固定は
不可能であった。Furthermore, when the f, g coil having the configuration shown in FIG. 1 is attached to a printed circuit board, the winding 2 is fixed to the board by bonding it with resin or the like or by connecting the terminal 3. However, in the former case, since the choke coil is supported by the winding, there are problems such as deformation of the winding and disconnection when using thin litz wire, and also variations in the amount of resin when bonding to the printed circuit board. Due to these reasons, there was a problem in that the choke coil inductance after installation varied widely. On the other hand, when installing with the winder 3, there was a problem in using it in an environment subject to vibration, and it was impossible to fix it with a litz wire.
本発明の目的は、環状磁心を分割してその巻線を容易に
すると同時に、磁心の分割磁心の接合面の磁路断面積、
形状を他部分より大きくとって磁心の分割部分の（ＩＣ
Ｃ低抵抗減少金はかるとともに、この分割磁心の接合面
の磁路断面績の大きい部分の形状を利用してプリントＪ
と板等へ強固な固定のできる高周波チョークコイルを提
供するにある。The purpose of the present invention is to divide an annular magnetic core to facilitate its winding, and at the same time, reduce the magnetic path cross-sectional area of the joint surface of the divided magnetic core.
The shape of the divided part of the magnetic core is made larger than other parts (IC
In addition to measuring C low resistance reduction, printing J
The purpose of the present invention is to provide a high frequency choke coil that can be firmly fixed to a board, etc.
〔発明の概要〕
本発明の高周波チョークコイルは径方向に分割した軟質
磁性材料から成る環状磁心の分割磁心の接合面の磁路断
面積を他の環状部分の磁路断面積より太きくした分割磁
心を用い、この分割磁心それぞれに巻線を施したことを
特徴としたものである。[Summary of the Invention] The high-frequency choke coil of the present invention is a divided magnetic core made of a soft magnetic material divided in the radial direction. It is characterized by using a magnetic core and winding each of the divided magnetic cores.
次に第２図乃至第５図を用いて更に詳しく説明する。Next, a more detailed explanation will be given using FIGS. 2 to 5.
第２図（（ａ）は軸方向における断面図、（ｂ）は側面
図）は本発明による環状磁心の分割磁心であり、接合面
１３において分割磁心の接合面１３の面積、即ち、分割
磁心の接合面の磁路断面積は、環状磁心の他の部分の磁
路断面１４ （斜線部）の面沿１・より大きくなってい
る。また、接合面１３の外側１部分迄の大きさ１５、お
よび磁心の厚さ１８は、環状磁心の分割磁心１１の接合
面１３以外のＦｉ５分に巻線を屑へしたとき、巻線の最
大外径および厚さより大きくなるように定めてちる。ま
た、分ｊｉｌｌ接合而１３の外側の而１９．および厚さ
が大きくなっている部分の底面２０は、平担になってお
り、このいずれかの部分でプリント基板への取付は固着
がＩＪｆ能で、このとき。FIG. 2 ((a) is a cross-sectional view in the axial direction, and (b) is a side view) shows a divided magnetic core of an annular magnetic core according to the present invention. The magnetic path cross-sectional area of the joint surface is larger than the magnetic path cross-section 14 (shaded area) along the plane of the other part of the annular magnetic core. In addition, the size 15 of the outer part of the joint surface 13 and the thickness 18 of the magnetic core are the maximum of the winding when the winding is scrapped at Fi5 other than the joint surface 13 of the divided magnetic core 11 of the annular magnetic core. It is determined to be larger than the outer diameter and thickness. Also, the outer part of the jill joint part 13 is 19. The bottom surface 20 of the thicker part is flat, and it is possible to attach it to the printed circuit board at any of these parts.
巻線の外側部分はプリント基板と接触しない。The outer part of the winding does not come into contact with the printed circuit board.
第３図も本発明による高周波チョークコイルの環状磁心
の分割磁心２１（第３図（ａ）は軸方向断面図。FIG. 3 also shows a divided magnetic core 21 of an annular magnetic core of a high-frequency choke coil according to the present invention (FIG. 3(a) is an axial cross-sectional view.
第３図（ｂｌは側面図）であり、接合面２３０大きさは
半径方向の大きさおよび厚さが、接合面以外の部分に巻
線を施しだとき巻線の最大外径および厚さよりもさらに
大きくなっているため接合面２３の磁路断面積は、環状
磁心の磁路断面２４（斜線部）の面積より太きい。まだ
接合面２３の外側部分の面２９と厚さ方向の底面２６は
平担になってお９、この平担部分でプリント基板への取
付は固着が可能で、このとき巻線はプリント基板へ接触
しない。さらに、この磁心の分割磁心２１の接合面２３
の一方には接合面に向って円周方向の開口部の幅がせま
いｒＭ２５が設けられており、もう一方の接合面には溝
２５と嵌合する形状の突起２７が設けられている。この
磁心分割磁心２１に巻線を施したものを２個嵌合させ必
要に応じて結線して高周波チョークコイルとする０
本発明に用いる軟質磁性材料はソフトフェライトの他、
鉄、Ｎｉまたは鉄合金から成る金属磁性粉末と有機樹脂
を混合し、金属磁性粉末全樹脂で絶縁すると同時に結着
して成形した磁性材料（以降圧粉磁性体と記す）などが
適当である。In Fig. 3 (bl is a side view), the size of the joint surface 230 is such that the size and thickness in the radial direction are larger than the maximum outer diameter and thickness of the winding when winding is applied to a portion other than the joint surface. Since it is further larger, the magnetic path cross-sectional area of the joint surface 23 is larger than the area of the magnetic path cross-section 24 (shaded area) of the annular magnetic core. The outer surface 29 of the joint surface 23 and the bottom surface 26 in the thickness direction are still flat 9, and it is possible to fix the winding to the printed circuit board at this flat portion. No contact. Furthermore, the joint surface 23 of the divided magnetic core 21 of this magnetic core
An opening rM25 having a narrow opening in the circumferential direction toward the joining surface is provided on one side, and a protrusion 27 having a shape to fit into the groove 25 is provided on the other joining surface. Two wound wires are fitted to this divided magnetic core 21 and connected as necessary to form a high frequency choke coil. In addition to soft ferrite, the soft magnetic materials used in the present invention include
A suitable material is a magnetic material (hereinafter referred to as powder magnetic material) formed by mixing a metal magnetic powder made of iron, Ni, or an iron alloy with an organic resin, insulating the metal magnetic powder entirely with the resin, and bonding and molding the mixture.
この圧粉磁性体に用、いる金属磁性粉末は、Ｆｅ。The metal magnetic powder used for this powder magnetic material is Fe.
Ｆｅ −Ｓ ｉ合金、 Ｆｅ−Ｎｉ合金、 Ｎｉ 、
Ｊｉ”ｅ −８ｉ −Ａ１合金。Fe-Si alloy, Fe-Ni alloy, Ni,
Ji”e-8i-A1 alloy.
Ｆｅ −Ａｔ合金、 Ｆｅ −Ｎｉ−Ｍｏ合金などの＃
、質質性性金属粉末であり、高周波特性と成形後の表面
粗度から磁性粉末の平均粒径は１００μｍ以下でちるこ
とが望ましい。また、有機樹脂は熱可塑性の樹脂たとえ
ばポリアミド樹脂、ポリエステルｒｌｉｔ月ｈ゛、ポリ
カーボネート樹脂や半硬化状態にあるエポキシ樹脂など
の熱硬化性樹脂が適当である。なお、圧粉磁性体中の樹
脂の量は体積比で１．５％以上あることが強度および金
属磁性粉末の絶縁上望捷しい。# of Fe-At alloy, Fe-Ni-Mo alloy, etc.
It is a qualitative metal powder, and it is desirable that the average particle size of the magnetic powder is 100 μm or less in view of high frequency characteristics and surface roughness after molding. Suitable organic resins include thermoplastic resins such as polyamide resins, polyester resins, polycarbonate resins, and thermosetting resins such as semi-cured epoxy resins. Note that it is desirable for the amount of resin in the dust magnetic material to be 1.5% or more by volume in terms of strength and insulation of the metal magnetic powder.
とくにこの圧粉磁性体を用いる局舎、金属磁性粉末と樹
脂を混合、磁心の分割磁心の形状に成形の後５巻線を施
した２つの分割磁心ｆ：接接合で合わせるかまたは嵌合
し、熱処理を施すことにより２つの分割磁心が接合され
一体の環状磁心どなる利点がある。In particular, in a station using this dust magnetic material, two divided magnetic cores f made by mixing metal magnetic powder and resin, molding them into the shape of the divided magnetic core, and then applying five windings: are brought together by welding or fitted. There is an advantage that by applying heat treatment, the two divided magnetic cores are joined to form an integral annular magnetic core.
本発明によりや状磁心金持ち、かつ巻線が容易な高周波
チョークコイルが得られた。According to the present invention, a high frequency choke coil with a thick core and easy to wind has been obtained.
本発明によれば、２つの磁心の分割磁心の接合面におけ
る磁路断面ｔｆｔが接合面近傍以外の磁心の磁路断面積
よシ大きくなっているため、分割面を合わせたときの分
割面間の磁気抵抗が環状磁心の単純分割の場合と比較し
て、磁路断面積の拡大に逆比例して小さくなっており、
これに伴い漏洩磁束も少ない。According to the present invention, since the magnetic path cross section tft at the joining surface of the divided magnetic cores of the two magnetic cores is larger than the magnetic path cross section area of the magnetic cores other than the vicinity of the joining surface, the distance between the dividing surfaces when the dividing surfaces are aligned is Compared to the case of simple division of the annular magnetic core, the magnetic resistance of is reduced in inverse proportion to the expansion of the magnetic path cross-sectional area
Along with this, leakage magnetic flux is also small.
また、この接合面近傍の磁路断面積を太きくした部分を
利用してプリント基板等への磁心の固着を可能にした。In addition, the magnetic core can be fixed to a printed circuit board or the like by utilizing the area where the cross-sectional area of the magnetic path is increased near the bonding surface.
この結果、高周波チョークコイルを強固にプリント基板
に取付けることが可能になり、固着時の巻線への強度的
な負Ｊｉｉがなく、巻線で固着する樹脂を用いないため
インダクタンスのバラツキも少ない。As a result, the high frequency choke coil can be firmly attached to the printed circuit board, there is no negative strength Jii to the winding when it is fixed, and there is little variation in inductance because no resin is used to fix the winding.
（実施例１）
Ｍｎ・’ｌｎ系フェライトを用いて第２図の形状の分割
磁心を製作し、巻線後２個を合わせて締結、結線しプリ
ント基板へ取付けた。この状態を第４図に示す。環状磁
心の分割磁心ＩＪには巻線３が施され、接合面１３にて
締結具３１で合わされて１個の高周波チョークコイルと
なっている。この高周波チョークコイルは接合面の磁路
断面積の大きな部分の厚さ方向の底面２０でプリント基
板３０に取付けられている。また端子３はプリント基板
へ接続されている。(Example 1) A split magnetic core having the shape shown in FIG. 2 was manufactured using Mn/'ln-based ferrite, and after winding, the two pieces were fastened together, wired, and attached to a printed circuit board. This state is shown in FIG. A winding 3 is applied to the divided magnetic core IJ of the annular magnetic core, and the coils 3 are joined at the joint surface 13 with a fastener 31 to form one high-frequency choke coil. This high frequency choke coil is attached to the printed circuit board 30 at the bottom surface 20 in the thickness direction of the joint surface where the magnetic path cross section is large. Further, the terminal 3 is connected to a printed circuit board.
なお、接合面１３の接合には締結具３１を用いずに接着
しても同じ効果が得られ、この場合は締結具が不要にな
るため、高周波チョークコイルの環状磁心の半径方向を
プリント基板と垂直にし、第２図の分割磁心の接合面近
傍の外側平１ｕ部でプリント基板へ固着することも可能
である。Note that the same effect can be obtained by adhering the joint surface 13 without using the fastener 31. In this case, the fastener is not required, so the radial direction of the annular magnetic core of the high frequency choke coil is connected to the printed circuit board. It is also possible to make it vertical and fix it to the printed circuit board at the outer flat 1u portion near the joint surface of the divided magnetic core shown in FIG.
（実施例２）
平均粒径４４μｍのＦｅ−３％８ｉ合金粉に、半硬化状
態のエポキシ樹脂を体積比で２５％混合し、金型に入れ
８００ＭＰａの圧力で成形し、第３図の分割磁心２１か
らなる圧粉磁性体の環状磁心を製作した。(Example 2) Fe-3%8i alloy powder with an average particle size of 44 μm was mixed with 25% by volume of semi-hardened epoxy resin, put into a mold and molded at a pressure of 800 MPa, and divided into parts as shown in Fig. 3. An annular magnetic core made of powder magnetic material consisting of a magnetic core 21 was manufactured.
この分割磁心２１２個のそれぞれ全巻ｕ、’Ｌ 後、嵌
合および結線し、１２０℃３０分の熱処理を施して樹脂
を硬化すると同時に磁心を接合させ高周波チョークコイ
ルとしだ。After each of the 212 divided magnetic cores had been completely wound, they were fitted and wired, and heat treated at 120° C. for 30 minutes to harden the resin. At the same time, the magnetic cores were joined to form a high frequency choke coil.
第５図にこの高周波チョークコイルをプリント板へ取付
けた状態を示す。分割磁心２１には巻線３が施されてい
る。２つの分割磁心は接合面２３において溝２５と突起
２７により嵌合され、熱処理によって接合されている。Figure 5 shows the state in which this high frequency choke coil is attached to a printed board. A winding 3 is provided on the divided magnetic core 21 . The two divided magnetic cores are fitted into the groove 25 and the protrusion 27 at the joint surface 23, and are joined by heat treatment.
また、この高周波チョークコイルは、接合面近傍の外側
の平担部分２９でプリント基板３０へ強固に取付けられ
ている。ｆ、だ１巻線。Further, this high frequency choke coil is firmly attached to the printed circuit board 30 at the outer flat portion 29 near the joint surface. f, 1st winding.
は結線部２Ｂで結線され、端子３はプリント基板へ接続
されている。are connected at the connection part 2B, and the terminal 3 is connected to the printed circuit board.
なお、この高周波チョークコ・ｆルのプリント板への取
付けは、第４１ヌ１と同様にもできることは当然である
。Incidentally, it goes without saying that this high-frequency choke coil can be attached to the printed board in the same manner as No. 41 No. 1.
第１図は環状磁心を用いた高周波チョークコイルの構成
図。
第２図（ａｌ及び第３図（ａｌは本発明に係る分割磁心
の軸方向断面図。
第３図（ｂ）及び第３図（ｂ）は本発明に係る分割磁心
の側面図。
第４図及び第５同は、本発明による高周波チョークコイ
ルをプリント基板へ取り付けた状態を示す構成図である
。
１１．２１・・・・分割磁心 １３，２３・・・匿合面
１４．２４・・・・環状磁心磁路断面（′；ｆ［掠Ｒ１
′Ｉ）２５・・・・嵌合用溝 ２７・・・・Ｆ台用突起
２８・・・・巻線の結線部 ３０・・・・プリント基板
３１・・・・締結具
代理人 弁理士 創遊）ｌ佑（仙Ｊ名）第Ｅ図
第２図
（ａ、）（ｂ）
第 ３ 図Figure 1 is a configuration diagram of a high-frequency choke coil using an annular magnetic core. FIG. 2 (al) and FIG. 3 (al are axial cross-sectional views of the divided magnetic core according to the present invention. FIGS. 3(b) and 3(b) are side views of the divided magnetic core according to the present invention. Figures 1 and 5 are configuration diagrams showing the high frequency choke coil according to the present invention attached to a printed circuit board. ...Annular magnetic core magnetic path cross section ('; f[R1
'I) 25...Fitting groove 27...Protrusion for F stand 28...Winding connection part 30...Printed circuit board 31...Fastener agent Patent attorney Soyu )l Yu (sen J name) Fig. E Fig. 2 (a,) (b) Fig. 3
Claims (1)
心の接合面の磁路断面積を環状磁心の他の部分の磁路断
面積よす太きくしかつ前記分割磁心それぞれに巻線を具
備したことを特徴とする高周波チョークコイル。 ２、特許請求の範囲第１項記載の高周波チョークコイル
において、それぞれの分割磁心が嵌合により接合されて
いる事をｌ特徴とする高周波チョークコイル。 ３）特許請求の範囲第１項又は第２項記載の高周波チョ
ークコイルにおいて１分割磁心が軟質磁性金属粉末と樹
脂粉末との混合体の圧縮形体で構成された事を４？徴と
する高周波チョークコイル。[Scope of Claims] 1) An annular magnetic core divided into a plurality of parts in the radial direction, the magnetic path cross-sectional area of the joint surface of the divided magnetic core being thicker than the magnetic path cross-sectional area of other parts of the annular magnetic core, and the divided magnetic core A high frequency choke coil characterized by each having a winding. 2. A high-frequency choke coil according to claim 1, characterized in that each divided magnetic core is joined by fitting. 3) In the high-frequency choke coil according to claim 1 or 2, the one-segment magnetic core is composed of a compressed mixture of soft magnetic metal powder and resin powder. High-frequency choke coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58176263A JPS6068608A (en) | 1983-09-26 | 1983-09-26 | High frequency choke coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58176263A JPS6068608A (en) | 1983-09-26 | 1983-09-26 | High frequency choke coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6068608A true JPS6068608A (en) | 1985-04-19 |
Family
ID=16010508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58176263A Pending JPS6068608A (en) | 1983-09-26 | 1983-09-26 | High frequency choke coil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6068608A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020213598A1 (en) * | 2019-04-16 | 2020-10-22 | 株式会社エス・エッチ・ティ | Choke coil and method for manufacturing same |
-
1983
- 1983-09-26 JP JP58176263A patent/JPS6068608A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020213598A1 (en) * | 2019-04-16 | 2020-10-22 | 株式会社エス・エッチ・ティ | Choke coil and method for manufacturing same |
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