JPS62257709A - Laminated transformer - Google Patents

Laminated transformer

Info

Publication number
JPS62257709A
JPS62257709A JP10129086A JP10129086A JPS62257709A JP S62257709 A JPS62257709 A JP S62257709A JP 10129086 A JP10129086 A JP 10129086A JP 10129086 A JP10129086 A JP 10129086A JP S62257709 A JPS62257709 A JP S62257709A
Authority
JP
Japan
Prior art keywords
ferrite
electrically connected
laminated
transformer
coil patterns
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
Application number
JP10129086A
Other languages
Japanese (ja)
Inventor
Takashi Kobayashi
隆 小林
Minoru Tamada
稔 玉田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to JP10129086A priority Critical patent/JPS62257709A/en
Publication of JPS62257709A publication Critical patent/JPS62257709A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To miniaturize a laminated transformer while providing it with stable characteristics through simple processes, by laminating a plurality of ferrite sheets each of which is provided on the surface thereof with two parallel coil patterns and connecting the coil patterns of adjacent sheets via through holes so as to form two sets of annular coils. CONSTITUTION:A ferrite sheet (FS) 10 provides lowermost layer of a laminated body. An FS 11 laid over the layer 10 is provided with terminal sections 20 and 21, two coil patterns (CP) 22 and 23 approximately parallel to each other and central connec tion sections 24 and 25. An FS 12 laid over the layer 11 is provided with CPs 30 and 31 and central connection sections 32 and 33 on the surface thereof. It is also provided with through holes 36 and 37 which are electrically connected to the central connection sections 24 and 25 of the FS 11. An FS 13 on the layer 12 has configurations corresponding to the FS 12 rotated by 180 degrees. The FS 13 has through holes 46 and 47 connected to the central connection sections 32 and 33 of the FS 12, respectively. On this FS 13, further FSs 12 and 13 are overlaid alternately while they are electrically connected in a similar manner. An FS 14 is overlaid thereon and electrically connected. Finally, an FS 15 is overlaid to provide two sets of annular coils.

Description

【発明の詳細な説明】 (4!:明の分野) 本発明は、アンテナ回路あるいは高周波増巾回路に使う
漬、′it型トシトランスする。
DETAILED DESCRIPTION OF THE INVENTION (4!: Field of Interest) The present invention provides a dielectric, 'it-type toshitransformer for use in antenna circuits or high frequency amplification circuits.

(従来の技術) 従来より、アンテナ回路あるいは高周波増巾回路に使う
トランスとしC1第3図に示すものがある。このトラン
スは、リング状フェライトコア1に平行細線2を巻回し
、平行刑@2の端部3.ご、4.4′にハンダ引き処理
5を施したものである。
(Prior Art) Conventionally, there is a transformer C1 shown in FIG. 3 as a transformer used in an antenna circuit or a high frequency amplification circuit. This transformer consists of a ring-shaped ferrite core 1 wound with a parallel thin wire 2, and an end 3. 4.4' is subjected to soldering treatment 5.

(発明が解決しようとする問題点) しかしながら、上広した従来のトランスには次のような
問題点があった。すなわち、このトランスは、例えば、
外伍3uφ穫度の小さなり/グ状フェライトコア1に、
り、21φの平行線2を手巻きした後、巻始め及び巻終
りを1本づつの線九分割し、それぞれの端部3.3’、
 4.4’を溶融ハンダに浸漬しCハンダ引き処理5を
施しC製造されCいるが、この製造作業は非常に細かく
、手作業とじでは限界に近いものであった。
(Problems to be Solved by the Invention) However, the conventional transformer which has been improved has the following problems. That is, this transformer, for example,
A small girder/gang-shaped ferrite core 1 with an outer diameter of 3uφ,
After winding the parallel wire 2 of 21φ by hand, divide the winding start and winding end into nine parts, each end 3.3',
4.4' was manufactured by dipping it in molten solder and subjecting it to the soldering process 5, but this manufacturing process was extremely detailed and manual binding was close to the limit.

一方、使う場合に於Cも、平行、m#2そのものがリン
グ状フェライトコア1に固着されCいるわけではなく、
動く状態であるため、回路への接、硯時も、引出線1本
1本が異なった分布定数を持つことになり、接続淡必ら
ず微A′Mせねばならiかった。さらに、微調整後もト
ランス本体を回、4基板と接着する必要があるなど、相
当複離な作業を経なければ使えなかった。
On the other hand, when used, C is parallel, m#2 itself is not fixed to the ring-shaped ferrite core 1,
Since it is in a moving state, each lead wire has a different distribution constant when connecting it to the circuit or when making an inkstone, so the connection always had to be made by a small amount of A'M. Furthermore, even after making fine adjustments, the transformer body had to be rotated and bonded to the four circuit boards, making it impossible to use it without undergoing quite complex work.

(問題点を解決するための手段) 本発明は、上・慇した従来のアンテナ回路あるい:は高
周波回路に使われるトランスの有する問題点と解決する
ためになされたものである。その手段としC本発明の積
1脅トランスは、表面にほぼ平行な2本のコイルパター
ンが形成されたフェライトシートを複数1層するととも
に、フェライトシートを貫通しC形成されたスルーホー
ルを介し゛C1隣接するフェライトシートのコイルパタ
ーンを屓に(気的に接続し、2祖の螺線状のコイルを形
成した構造からなるようにした。
(Means for Solving the Problems) The present invention has been made in order to solve the above-mentioned problems of conventional antenna circuits or transformers used in high frequency circuits. As a means for achieving this, the one-layer transformer of the present invention has a plurality of layers of ferrite sheets each having two coil patterns substantially parallel to each other on the surface thereof, and a through-hole formed through the ferrite sheets. C1 The coil pattern of the adjacent ferrite sheets is electrically connected to each other to form two spiral coils.

この結果、本発明の積層トランスは、小型であり、従来
のような複雑な手作業を必要とせず、一度に多くを作る
ことができる。又、使う上からも回路基板に直接ハンダ
付固定し得るため、甑めC安定した特性を得ることがで
きる。
As a result, the laminated transformer of the present invention is compact and can be manufactured in large quantities at one time without requiring complicated manual labor as in the past. Furthermore, since it can be directly fixed to the circuit board by soldering, stable characteristics can be obtained.

(実 施例) ・k下、図面とともに本発明の詳細な説明すも第1図は
、本発明の積層トランスの一実施例を示す斜視図、第2
図は、その分解平面図である。
(Example) Below is a detailed explanation of the present invention together with the drawings. Figure 1 is a perspective view showing one embodiment of the laminated transformer of the present invention,
The figure is an exploded plan view thereof.

この、積層トランスにおいで、10は積層体の最下層に
なつCいるフェライトノートであり、表面には何も形成
されCいない。
In this laminated transformer, 10 is a ferrite note which is the lowest layer of the laminated body, and nothing is formed on the surface thereof.

11はフェライトシート10の上に積1されたフェライ
トシートであシ、表面に引出し端子部20.21と、は
ぼ平行な2本のコイルパター/22.23と、中央接続
部24.25が同一の導電性材料によつC形成され〔い
る。中央接続部24.25は、コイルパターン22.2
5より巾の広い形状となつCいるが、これはフェライト
シートを積み重ね〔いくことによるfi電バラツキを吸
収する意味を持つCいる。
Reference numeral 11 denotes a ferrite sheet stacked on top of the ferrite sheet 10, with a lead-out terminal portion 20.21, two approximately parallel coil putters/22.23, and a central connection portion 24.25 on the surface. C is formed of the same conductive material. The central connection 24.25 has a coil pattern 22.2
It has a wider shape than 5, but this is meant to absorb the fluctuations in the FI voltage caused by stacking ferrite sheets.

12はフェライトシート11の上に積層されたフェライ
トシートであり、表面に、はぼ平行な2本のコイルパタ
ーン30.31と、中央接続部52.55が同一の導電
性材料によって形成されCいる。また、7エライトシー
ト12を貫いC形成された貫通孔34.35の内壁にも
同一の導電性材料が固着され、スルーホール36.37
:6E形成されCいる。そしC、スルーホール36はフ
ェライトシート11の中央接続部24と、スルーホール
37はフェライトシート11の中央接続部25とそれぞ
れ電気的に接続されCいる。
12 is a ferrite sheet laminated on the ferrite sheet 11, on the surface of which two nearly parallel coil patterns 30, 31 and a central connecting portion 52, 55 are formed of the same conductive material. . The same conductive material is also fixed to the inner wall of the through hole 34.35 formed through the 7-elite sheet 12, and the through hole 36.37
:6E is formed and C is present. The through hole 36 is electrically connected to the central connection portion 24 of the ferrite sheet 11, and the through hole 37 is electrically connected to the central connection portion 25 of the ferrite sheet 11.

13はフェライトシート12の上に積層されたフェライ
トシートであシ、フェライトシート12と全く同一の構
造のものであり、フェライトシート12を180°回転
させたものである。フェライトシート13においC,4
0,41はコイルパターン、42.43は中央接続部、
44.45は貫通孔、46.47はスルーホールである
。そしC1スルーホール46はフェライトシート12の
中央接続部52と、スルーホール47はフェライトシー
ト12の中央接vc部35とそれぞれ電気的に接続され
Cいる。
A ferrite sheet 13 is laminated on the ferrite sheet 12, and has exactly the same structure as the ferrite sheet 12, except that the ferrite sheet 12 is rotated by 180°. Ferrite sheet 13 odor C, 4
0,41 is the coil pattern, 42.43 is the center connection part,
44.45 is a through hole, and 46.47 is a through hole. The C1 through hole 46 is electrically connected to the central connecting portion 52 of the ferrite sheet 12, and the through hole 47 is electrically connected to the central connecting portion 35 of the ferrite sheet 12.

さらに、フェライトシート13の上に、フェライトシー
ト12とフェライトシート13が、交互に所望の枚数積
11されCいる。ただし、この部分では、フェライトシ
ート13の上!(乗るフェライトシート12のスルーホ
ール56..57は、フェライトシート13の中央接続
部42.43とそれぞれ電気的に接続され〔いる。また
、交互に積j蛋されたフェライトシート12とフェライ
トシート13の最上titは、フェライト7−ト12に
なっ°Cいる。
Furthermore, a desired number of ferrite sheets 12 and ferrite sheets 13 are stacked alternately on the ferrite sheet 13. However, in this part, on the ferrite sheet 13! (The through-holes 56...57 of the ferrite sheet 12 are electrically connected to the central connecting portions 42, 43 of the ferrite sheet 13, respectively. Also, the ferrite sheets 12 and ferrite sheets 13 stacked alternately The top temperature of the ferrite is 7-12°C.

14はフェライトシート12の上に積層されたフェライ
トシートであシ、表面に引出し端子部50.51と、は
ぼ平行12本のコイルパターン52゜53が同一の導電
性材料によって形成されていもまた、フェライトシート
14を貫いC形成された貫通孔54.55の内壁にも同
一の導電性材、叫が固着され、スルーホール56.57
が形成されCいる。そして、スルーホール56は、その
直下のフェライトシート12の中央接続部32と、スル
ーホール57はフェライトシート12の中央Jf1部5
5とそれぞれ電気的に接読されCいる。
Reference numeral 14 is a ferrite sheet laminated on the ferrite sheet 12, and the lead terminal portions 50 and 51 on the surface and 12 approximately parallel coil patterns 52 and 53 are formed of the same conductive material. The same conductive material is fixed to the inner wall of the through hole 54.55 formed through the ferrite sheet 14, and the through hole 56.57
is formed and C is formed. The through hole 56 connects to the central connecting portion 32 of the ferrite sheet 12 directly below it, and the through hole 57 connects to the central Jf1 portion 5 of the ferrite sheet 12.
5 and C are electrically connected to each other.

15はフェライトシート14の上に横+iされたフェラ
イトシートであり、表面には何も形成されCいない。
15 is a ferrite sheet placed horizontally on the ferrite sheet 14, and nothing is formed on the surface thereof.

60・61.62.63  は外部成極であシ、フェラ
イトシー) +0.11.12.13,14.+5 を
積層しC’lる積層体の4カ所に、たとえば、銀ぺ−ス
ト等を焼き付ける等の方法によつC形成されCいる。(
ただし、第2図では、外部’4i60゜61.62.6
5の図示を省略しCいる。)tし〔、外部電+i#、6
0は引出し端子部20と、外部1逼61は引出し端子部
21と、外部電極62は引出し端子部50と、外部1雁
63は引出し端子部51とそれぞれ電気的に接続され[
lnる。
60・61.62.63 is externally polarized, ferrite sea) +0.11.12.13,14. C is formed by, for example, baking silver paste or the like at four locations on the laminate in which +5 is laminated. (
However, in Figure 2, the external '4i60°61.62.6
5 is omitted from illustration. )t[, external voltage +i#, 6
0 is electrically connected to the extraction terminal section 20, external electrode 61 is electrically connected to the extraction terminal section 21, external electrode 62 is electrically connected to the extraction terminal section 50, and external electrode 1 63 is electrically connected to the extraction terminal section 51.
lnru.

以上のように構成された本発明の一実施例にかかる積−
醤トランスは、外部WL玉60と62、および外部電極
61と63を端部とする、電磁結合された2組のコイル
からなつ〔いる。
A product according to an embodiment of the present invention configured as described above.
The sauce transformer consists of two sets of electromagnetically coupled coils whose ends are external WL balls 60 and 62 and external electrodes 61 and 63.

この積層トランスは、たとえば次の方法によって製造さ
れる。
This laminated transformer is manufactured, for example, by the following method.

まず、フェライト粉及び有機溶媒、バインダー等の混練
しCなる泥しようを、押し出し法あるいはブレード法等
により薄いシート状にし、フェライトグリーン7−ト1
0’、11’、12’、13’、14’、15’(以下
、上盤したフェライトシート10.11.12.13.
14.15の焼成前の状態を7エライトグリーンシート
と呼び、番号にダッシュを付しC表わす。)を得る。
First, ferrite powder, an organic solvent, a binder, etc. are kneaded into a slurry C, which is made into a thin sheet by an extrusion method or a blade method.
0', 11', 12', 13', 14', 15' (hereinafter referred to as top ferrite sheets 10.11.12.13.
The state of No. 14.15 before firing is called 7 Elite Green Sheet, and is denoted by C with a dash added to the number. ).

次に、フェライトグリーンシー) 12’、13’。Next, ferrite green sea) 12', 13'.

14’に、貫通孔54.35.44.45.54.55
を、金車により打ち抜く等の方法によつで・セれぞれ形
成する。
14', through hole 54.35.44.45.54.55
are formed by a method such as punching with a metal wheel.

次ニ、フェライトグリーンシート11’、12’。Next, ferrite green sheets 11' and 12'.

1s’、14’;′c、導1性材料を印刷しC引出し端
子部20.21.50.51 、コイルノ(ターン22
.23゜30、31.40.41.52.53、中央接
続部24゜も同一の導電性材料を流し込んでスルーホー
ル36.37.46.47.56.57をとれそれ形成
す12’、13’、14’、15’を積層し、全体をむ
らなく平面加圧したのち焼成しC1積層焼結体を得る。
1s', 14';'c, printed conductive material, C drawer terminal part 20.21.50.51, coil no. (turn 22
.. 23° 30, 31.40.41.52.53, and the central connection part 24° are also filled with the same conductive material to form through holes 36.37.46.47.56.57 12', 13 ', 14', and 15' are laminated, the whole is evenly pressed flat, and then fired to obtain a C1 laminated sintered body.

、62.63を形成する。, 62.63 are formed.

以上は本発明の積層トランスの一実施例、およびその製
造方法の一例であシ、本発明の趣旨を損なわない範囲内
で設計変更をなしうることはいう1で4々い。たとえば
、各コイルの巻数は玉章であシ、下から順にフェライト
シート10.フェライトシート11.フェライトシート
12.フェライトシート14.フェライトシート15を
積層すれば、各コイルの巻数が1回の積層トランスにな
る。
The above is one embodiment of the laminated transformer of the present invention and an example of its manufacturing method, and it is noted that design changes may be made without departing from the spirit of the present invention. For example, the number of turns of each coil is a jade pattern, and the number of turns from the bottom is 10 ferrite sheets. Ferrite sheet 11. Ferrite sheet 12. Ferrite sheet 14. By laminating the ferrite sheets 15, a laminated transformer with each coil having one turn is obtained.

(発明の効J4!:) 以上の説明からも明らかなように、本発明の積層トラン
スは、表面にほぼ平行な2本のコイル・(ターンが形成
されたフェライトシートを複数積層するとともに、フェ
ライトシートを貫通しC形成されたスルーホールを介し
C1隣接するフェライトシートのコイルパターンを項に
電気的に接続し電磁結合された2組の現線状のコイルを
形成したものである。
(Effect of the invention J4!:) As is clear from the above explanation, the laminated transformer of the present invention is constructed by laminating a plurality of ferrite sheets with two coils (turns formed on the surface) substantially parallel to the surface, and The coil patterns of the ferrite sheets adjacent to C1 are electrically connected to each other via a through hole formed through the sheet to form two sets of electromagnetically coupled current wire coils.

したがりC1本発明の積)畜トランスは、リング状フェ
ライトコアに平行旧線を手作業によつC巻回し゛C製造
しCいた、従来のアンテナ回路あるいは高周波増巾回路
用トランスと異なシ、製造の機械化をはかることができ
る。しかも、同一の導゛1性材料を一度に印刷する方法
によつC,フェライトシートにコイルパターン、中央接
続s、スルーホールを容易に形成することができるため
、大量生産に適しCいる。
Therefore, the product transformer of the present invention has a different design from the conventional transformer for antenna circuits or high frequency amplification circuits, which is manufactured by manually winding parallel old wires around a ring-shaped ferrite core. , manufacturing can be mechanized. Moreover, it is suitable for mass production because the coil pattern, central connection, and through holes can be easily formed on the ferrite sheet by printing the same conductive material all at once.

また、チップ状に形成することができるため、プリント
回路基板等への取付けを、自動部品嘴給機およびフロー
半田等によつC容易に、しかも強固におこなうことがで
きる。さらに、従来のように取付は後に微調整をおこな
う必要がない。
Furthermore, since it can be formed into a chip, it can be easily and firmly attached to a printed circuit board or the like using an automatic component feeder, flow soldering, or the like. Furthermore, there is no need to make fine adjustments after installation as in the conventional case.

さらに、電線を使用しCいないため倚イが安定しC2す
、*tthや衛零によつ〔特性が変化しCしまうことも
ない。
Furthermore, since no electric wires are used, the current is stable, and the characteristics do not change due to C2 or noise.

【図面の簡単な説明】[Brief explanation of drawings]

第1図:i本発明の一実施例にかかる慎ノートランスを
示す斜視図、第2図はその分解平面図、第5図は、従来
のトランスを示す平面図である。 IO,it、+2.13.1.15・・−・・セラミッ
クシ−ト、20.21.50.51・・・・・・引出し
端子部、22゜23.30.31.40.41.52.
53・・−・・コイルノ;ターン、24.25.32.
33.42.43・・・・・中央妾続部、36.57.
46.47.56.57・・・・・・スルーホール。
FIG. 1 is a perspective view showing a simple transformer according to an embodiment of the present invention, FIG. 2 is an exploded plan view thereof, and FIG. 5 is a plan view showing a conventional transformer. IO, it, +2.13.1.15...Ceramic sheet, 20.21.50.51...Output terminal part, 22°23.30.31.40.41. 52.
53... Coil no; turn, 24.25.32.
33.42.43...Central Concubinage Department, 36.57.
46.47.56.57...Through hole.

Claims (1)

【特許請求の範囲】[Claims]  表面にほぼ平行な2本のコイルパターンが形成された
フェライトシートを複数積層するとともに、フェライト
シートを貫通して形成されたスルーホールを介して隣接
するフェライトシートのコイルパターンを順に電気的に
接続し、電磁結合された2組の螺線状のコイルを形成し
てなる積層トランス。
A plurality of ferrite sheets each having two almost parallel coil patterns formed on their surfaces are laminated, and the coil patterns of adjacent ferrite sheets are sequentially electrically connected through through holes formed through the ferrite sheets. , a laminated transformer formed by two sets of spiral coils that are electromagnetically coupled.
JP10129086A 1986-04-30 1986-04-30 Laminated transformer Pending JPS62257709A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10129086A JPS62257709A (en) 1986-04-30 1986-04-30 Laminated transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10129086A JPS62257709A (en) 1986-04-30 1986-04-30 Laminated transformer

Publications (1)

Publication Number Publication Date
JPS62257709A true JPS62257709A (en) 1987-11-10

Family

ID=14296714

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10129086A Pending JPS62257709A (en) 1986-04-30 1986-04-30 Laminated transformer

Country Status (1)

Country Link
JP (1) JPS62257709A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0566920U (en) * 1992-02-20 1993-09-03 太陽誘電株式会社 Multilayer ceramic electronic components
WO2008053613A1 (en) * 2006-10-31 2008-05-08 Mitsubishi Electric Corporation Sheet-type transformer and discharge lamp lighting device
KR20220015403A (en) * 2019-05-02 2022-02-08 나노-디멘션 테크놀로지스, 엘티디. System and method for manufacturing coils for coreless transformers and inductors

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57173919A (en) * 1981-04-21 1982-10-26 Tdk Corp Laminated transformer
JPS5889819A (en) * 1981-11-20 1983-05-28 Matsushita Electric Ind Co Ltd Manufacture of chip inductor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57173919A (en) * 1981-04-21 1982-10-26 Tdk Corp Laminated transformer
JPS5889819A (en) * 1981-11-20 1983-05-28 Matsushita Electric Ind Co Ltd Manufacture of chip inductor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0566920U (en) * 1992-02-20 1993-09-03 太陽誘電株式会社 Multilayer ceramic electronic components
WO2008053613A1 (en) * 2006-10-31 2008-05-08 Mitsubishi Electric Corporation Sheet-type transformer and discharge lamp lighting device
US8179223B2 (en) 2006-10-31 2012-05-15 Mitsubishi Electric Corporation Sheet type transformer and discharge lamp lighting apparatus
KR20220015403A (en) * 2019-05-02 2022-02-08 나노-디멘션 테크놀로지스, 엘티디. System and method for manufacturing coils for coreless transformers and inductors
JP2022525442A (en) * 2019-05-02 2022-05-13 ナノ ディメンション テクノロジーズ,リミテッド Systems and methods for manufacturing coils for coreless transformers and inductors

Similar Documents

Publication Publication Date Title
KR100297584B1 (en) Coiled component and its production method
US4322698A (en) Laminated electronic parts and process for making the same
JPS6379307A (en) Moltilayered transformer
JP2001076953A (en) Laminated coil component and manufacture thereof
JPH10321436A (en) Laminated-type coil and manufacture thereof
JPH0748417B2 (en) Laminated transformer
JPH11265823A (en) Laminated inductor and manufacture of the same
JPH0669057A (en) Manufacture of laminated chip inductor
JPH01151211A (en) Structure of laminate-applied component
JPS59132604A (en) Laminated inductor
JP2020194808A (en) Laminated coil component
JPS62257709A (en) Laminated transformer
JPS6228891B2 (en)
JPH03153011A (en) Laminated transformer
JPS6119179B2 (en)
JPH01151212A (en) Structure of laminate-applied component
JP2938631B2 (en) Manufacturing method of multilayer ceramic inductor
JP2001060518A (en) Laminated electronic component
JPS6031242Y2 (en) LC composite parts
JPH05175060A (en) Chip-shaped transformer and its manufacture
JPH09199331A (en) Coil component and its manufacture
JPS6031243Y2 (en) composite parts
JPS584803B2 (en) laminated transformer
JPH09199333A (en) Coil component and its manufacture
JPS6344972Y2 (en)