JPH0118562B2 - - Google Patents
Info
- Publication number
- JPH0118562B2 JPH0118562B2 JP54141081A JP14108179A JPH0118562B2 JP H0118562 B2 JPH0118562 B2 JP H0118562B2 JP 54141081 A JP54141081 A JP 54141081A JP 14108179 A JP14108179 A JP 14108179A JP H0118562 B2 JPH0118562 B2 JP H0118562B2
- Authority
- JP
- Japan
- Prior art keywords
- winding
- porous layer
- resin
- insulating resin
- bobbin
- 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.)
- Expired
Links
- 229920005989 resin Polymers 0.000 claims description 32
- 239000011347 resin Substances 0.000 claims description 32
- 238000004804 winding Methods 0.000 claims description 32
- 239000010410 layer Substances 0.000 claims description 14
- 239000011810 insulating material Substances 0.000 claims description 13
- 239000011229 interlayer Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 8
- 229920001187 thermosetting polymer Polymers 0.000 claims description 4
- 239000004020 conductor Substances 0.000 description 14
- 239000011888 foil Substances 0.000 description 11
- 238000009413 insulation Methods 0.000 description 6
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 4
- 229920002554 vinyl polymer Polymers 0.000 description 4
- 239000012774 insulation material Substances 0.000 description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000123 paper Substances 0.000 description 3
- 240000000907 Musa textilis Species 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000001029 thermal curing Methods 0.000 description 1
- 239000002966 varnish Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/32—Insulating of coils, windings, or parts thereof
- H01F27/327—Encapsulating or impregnating
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Insulating Of Coils (AREA)
Description
【発明の詳細な説明】
本発明は、例えばスイツチングレギユレタなど
に使用される絶縁型インダクタンス装置に関し、
特に１次側・２次側の各巻線全体を樹脂で包囲し
た構造とすることにより、１次側・２次側の各巻
線間等の絶縁性の向上を図り得るようにした絶縁
型インダクタンス装置を提供しようとするもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insulated inductance device used, for example, in a switching regulator.
In particular, the insulated inductance device has a structure in which each winding on the primary and secondary sides is entirely surrounded by resin, thereby improving the insulation between each winding on the primary and secondary sides. This is what we are trying to provide.
一般にこの種の絶縁型インダクタンス装置は、
例えば第１図に示すようにコア１と、このコア１
に装着されたボビン２と、このボビン２上に、こ
のボビン２の両端に形成された第１及び第２の各
鍔部３，４に沿うように例えば箔状の巻線を多数
回に亘つて巻回して成る巻装部５とから構成され
ており、その巻線構造は例えば第２図に示すよう
な構造を有している。 Generally, this type of insulated inductance device is
For example, as shown in FIG.
A bobbin 2 is mounted on the bobbin 2, and a foil-like winding wire is wound many times on the bobbin 2 along the first and second flanges 3 and 4 formed at both ends of the bobbin 2. The winding section 5 has a winding structure as shown in FIG. 2, for example.
すなわち筒状のボビン２上に、まず１次側巻線
６を構成する箔状導体７ａ，７ｂ，…と層間絶縁
材８ａ，８ｂ，…とを交互に重ね巻き、次にこの
１次側巻線６と後述する２次側巻線９との間を絶
縁する１次側・２次側絶縁材１０を巻き付け、さ
らにその上に２次側巻線９を構成する箔状導体１
２ａ，１２ｂ…と層間絶縁材１３ａ，１３ｂ…と
を交互に重ね巻きした構造を有している。 That is, on the cylindrical bobbin 2, first, the foil-like conductors 7a, 7b, . A foil conductor 1 constituting the secondary winding 9 is wrapped around a primary/secondary insulating material 10 that insulates between the wire 6 and a secondary winding 9 to be described later.
2a, 12b... and interlayer insulating materials 13a, 13b... are alternately wound in layers.
ところで、このような構造を有する絶縁型イン
ダクタンス装置にあつては、隣接する各箔状導体
７ａ，７ｂ，１２ａ，１２ｂ間、及び１次側・２
次側の各巻線６，９の始端及び終端からそれぞれ
引き出された引出し線１４，１５，１６，１７と
各導体７ａ，７ｂ，１２ａ，１２ｂ…との間の２
箇所の沿面距離を十分に確保することが耐電圧特
性の向上を図る見地から重要である。 By the way, in the case of an insulated inductance device having such a structure, there are
2 between the lead wires 14, 15, 16, 17 drawn out from the start and end ends of the windings 6, 9 on the next side, respectively, and the conductors 7a, 7b, 12a, 12b...
It is important to ensure sufficient creepage distance at each location from the standpoint of improving withstand voltage characteristics.
従来、かかる見地から、前者の隣接する各箔状
導体７ａ，７ｂ，１２ａ，１２ｂ間の沿面距離を
確保するため、各箔状導体７ａ，７ｂ，１２ａ，
１２ｂの幅l1よりも層間絶縁材８ａ，８ｂ，１３
ａ，１３ｂの幅l2を充分広目に形成すると共に、
その肉厚を所定以上の厚さに形成することにより
解決し、他方、後者の引出し線１４，１５，１
６，１７と各箔状導体７ａ，７ｂ，１２ａ，１２
ｂとの間の沿面距離を確保するため、第２図に示
すようにビニールチユーブ１８，１９，２０，２
１を各引出し線１４，１５，１６，１７に被着す
ることにより解決を図るような方策が講じられて
いた。 Conventionally, from this point of view, in order to secure the creepage distance between the adjacent foil conductors 7a, 7b, 12a, 12b, the foil conductors 7a, 7b, 12a,
Interlayer insulation materials 8a, 8b, 13 than the width l 1 of 12b
While forming the width l 2 of a and 13b to be sufficiently wide,
This problem can be solved by forming the wall thickness to a predetermined thickness or more.
6, 17 and each foil conductor 7a, 7b, 12a, 12
In order to ensure the creepage distance between the vinyl tubes 18, 19, 20, and
Measures have been taken to solve this problem by attaching the lead wires 14, 15, 16, and 17 with the following.
しかし、このような方法でも未だ耐電圧特性に
十分でなく、特に引出し線１４，１５，１６，１
７にビニールチユーブ１８，１９，２０，２１を
被着して沿面距離を確保する方法によると、ビニ
ールチユーブ１８，１９，２０，２１が重なり合
うなどして巻きずれを生ずる可能性も十分存在す
るばかりでなく、その分外形が大きくなり、従つ
て装置全体を小型化するには適さないものであつ
た。 However, even with this method, the withstand voltage characteristics are still insufficient, especially for the lead wires 14, 15, 16, 1.
According to the method of securing the creepage distance by attaching the vinyl tubes 18, 19, 20, and 21 to the tubes 7, there is a strong possibility that the vinyl tubes 18, 19, 20, and 21 may overlap and cause misalignment. However, the external size increases accordingly, and therefore it is not suitable for downsizing the entire device.
本発明は、このような従来の欠点に鑑み、簡単
な方法で耐絶縁特性、耐電圧特性にすぐれかつ小
型化が可能な絶縁型インダクタンス装置を提供し
ようとするものである。 In view of these conventional drawbacks, the present invention aims to provide an insulated inductance device that has excellent insulation and voltage resistance characteristics and can be miniaturized using a simple method.
以下、本発明の一実施例について図面に従つて
説明する。 An embodiment of the present invention will be described below with reference to the drawings.
第３図は本発明に係る絶縁型インダクタンス装
置の要部を拡大したものである。 FIG. 3 is an enlarged view of the main parts of the insulated inductance device according to the present invention.
第３図に示すように、金属又はフエライトなど
の材料より成るコア２２には、巻枠としての筒状
のボビン２３が装着されており、このボビン２３
上には、このボビン２３の一端に突出して一体形
成した第１の鍔部２４に沿うように、巻装部２５
が形成されている。この巻装部２５は、箔状導体
２６ａ，２６ｂ…と層間絶縁材２７ａ，２７ｂ…
とを交互に多数回に亘つて重ね巻きして成る１次
側巻線２８と、この１次側巻線２８上に含浸性の
良好な多孔質紙２９ａ，２９ｂ…を多数回に亘つ
て巻回して成る多孔質層３０と、この多孔質層３
０上にさらに箔状導体３１ａ，３１ｂ…と層間絶
縁材３２ａ，３２ｂ…とを交互に多数回に亘つて
巻回して成る２次側巻線３３とから構成されてい
る。 As shown in FIG. 3, a cylindrical bobbin 23 as a winding frame is attached to a core 22 made of a material such as metal or ferrite.
On the top, a winding part 25 is disposed along the first collar part 24 which is integrally formed and projects from one end of the bobbin 23.
is formed. This winding portion 25 includes foil conductors 26a, 26b... and interlayer insulating materials 27a, 27b...
A primary winding 28 is formed by alternately winding a plurality of layers in multiple layers, and a porous paper 29a, 29b with good impregnability is wound on the primary winding 28 a large number of times. a porous layer 30 formed by rotating the porous layer 3;
0 and a secondary winding 33 formed by alternately winding foil-like conductors 31a, 31b, . . . and interlayer insulating materials 32a, 32b, . . . over a large number of turns.
上記各層間絶縁材２７ａ，２７ｂ…３２ａ，３
２ｂは、沿面距離を充分に確保し得るように各箔
状導体２６ａ，２６ｂ…３１ａ，３１ｂの幅l3よ
りも幾分広い幅l4を有しており、例えば肉薄のマ
イカなどの材料により形成されている。なお、上
記各多孔質紙２９ａ，２９ｂ…の幅は、上記各層
間絶縁材２７ａ，２７ｂ…３２ａ，３２ｂとほぼ
同一の幅l4を有している。 Each of the above interlayer insulation materials 27a, 27b...32a, 3
2b has a width l4 somewhat wider than the width l3 of each foil conductor 26a, 26b...31a, 31b in order to ensure a sufficient creepage distance, and is made of a material such as thin mica, for example. It is formed. The width of each of the porous papers 29a, 29b, . . . is approximately the same width l4 as that of each of the interlayer insulating materials 27a, 27b, .
上述した多孔質層３３を構成する各多孔質紙２
９ａ，２９ｂ…は、例えばクラフト紙、マニラ麻
等から形成されており、液体絶縁樹脂が充分に浸
透し易い性質を有している。従つて、１次側及び
２次側の各巻線２８，３３の始端及び終端から引
き出された引き出し線３４，３５，３６，３７の
側から、液状の例えばワニス等の熱硬化型の絶縁
樹脂３８を上記多孔質層３０に注入すると、この
多孔質層３０の内部を通つて第１の鍔部２４側に
まで浸透し、第３図中矢印方向に流れて巻装部２
５の一端面（図中下端面）と第１の鍔部２４の内
側面２４ａとの間の所定の空隙部３９内の隅々ま
で上記絶縁樹脂３８があまねく行き渡る。しか
も、第１の鍔部２４の先端内側面上には、巻装部
２５の最外周に巻き付けられた絶縁材４０の一端
４０ａを完全に包囲するように、光の照射で硬化
可能であつて塗布時の形状を硬化後も維持可能な
性質を有する光硬化型のシール用樹脂４１が付着
されているため、上記空隙部３９内にまで注入さ
れた絶縁樹脂３８は、上記シール用樹脂４１によ
りせき止められる。このため絶縁樹脂３８は、上
記空隙部３９内に完全に充填され、さらに各箔状
導体２６ａ，２６ｂ…３１ａ，３１ｂ…間、及び
各層間絶縁材２７ａ，２７ｂ…３２ａ，３２ｂ…
間にまで浸透し、ついには巻装部２５の最外周に
位置する絶縁材４０の他端４０ｂの位置まで上記
絶縁樹脂３８が満たされる。このように絶縁樹脂
３８は、巻装部２５の一端側（第１の鍔部２４
側）の空隙部３９内と他端側（各引き出し線３
４，３５…側）の絶縁材４０の他端４０ｂ位置に
至るまでの空間部４２内との両方にまで充填され
るので、巻装部２５を構成する各箔状導体２６
ａ，２６ｂ…３１ａ，３１ｂ間及び各層間絶縁材
２７ａ，２７ｂ…３２ａ，３２ｂ…間のみなら
ず、巻装部２５の一端面・他端面まで絶縁樹脂３
８を含浸することができる。従つて、巻装部２５
の全体を上記絶縁樹脂３８で包囲することができ
る。この後、絶縁樹脂３８を熱硬化させれば、巻
装部２５の内部を絶縁樹脂３８で一体的に固化さ
せることできる。従つて各箔状導体２６ａ，２６
ｂ…３１ａ，３１ｂ…間、及び各層間絶縁材２７
ａ，２７ｂ…３２ａ，３２ｂ…間や、各引き出し
線３４ないし３７と各箔状導体２６ａ，２６ｂ…
３１ａ，３１ｂ…間、ならびに１次側・２次側の
各巻線２８，３３間を絶縁樹脂３８で埋めること
ができ、このため耐衝撃電圧特性、耐湿性、絶縁
特性にすぐれた絶縁型インダクタンス装置を得る
ことができる。 Each porous paper 2 constituting the porous layer 33 described above
9a, 29b, . . . are made of, for example, kraft paper, Manila hemp, etc., and have a property that the liquid insulating resin easily penetrates into them. Therefore, from the side of the lead wires 34, 35, 36, 37 drawn out from the starting and terminal ends of each of the primary and secondary windings 28, 33, a thermosetting insulating resin 38 such as liquid varnish or the like is applied. When injected into the porous layer 30, it penetrates through the inside of the porous layer 30 to the first flange 24 side, flows in the direction of the arrow in FIG.
The insulating resin 38 is spread throughout the predetermined gap 39 between one end surface (lower end surface in the drawing) of the first flange 24 and the inner surface 24a of the first flange 24. Moreover, on the inner surface of the tip of the first flange part 24, there is a material that can be cured by irradiation with light so as to completely surround one end 40a of the insulating material 40 wound around the outermost circumference of the wrapping part 25. Since the photo-curable sealing resin 41 which has the property of maintaining the shape at the time of application even after curing is attached, the insulating resin 38 injected into the cavity 39 is cured by the sealing resin 41. I can stop it. Therefore, the insulating resin 38 is completely filled in the void 39, and furthermore, the insulating resin 38 is filled between each foil conductor 26a, 26b...31a, 31b... and each interlayer insulating material 27a, 27b...32a, 32b...
The insulating resin 38 penetrates into the gap, and finally reaches the other end 40b of the insulating material 40 located at the outermost periphery of the wrapped portion 25. In this way, the insulating resin 38
side) and the other end side (each lead-out line 3
4, 35... side) up to the other end 40b position of the insulating material 40.
Insulating resin 3 is applied not only between a, 26b...31a, 31b and between each interlayer insulating material 27a, 27b...32a, 32b, but also to one end surface and the other end surface of the winding part 25.
8 can be impregnated. Therefore, the winding part 25
can be entirely surrounded by the insulating resin 38. Thereafter, by thermosetting the insulating resin 38, the inside of the winding portion 25 can be integrally solidified with the insulating resin 38. Therefore, each foil conductor 26a, 26
b... between 31a, 31b... and each interlayer insulating material 27
a, 27b...32a, 32b... and between each lead wire 34 to 37 and each foil conductor 26a, 26b...
31a, 31b... and between each winding 28, 33 on the primary side and secondary side can be filled with insulating resin 38, thus providing an insulated inductance device with excellent shock resistance, moisture resistance, and insulation properties. can be obtained.
なお、絶縁樹脂３８の固化後あるいは固化中
に、ボビン２３の他端に第２の鍔部４３を装着し
て絶縁型インダクタンス装置が完成される。 Note that after or during solidification of the insulating resin 38, the second flange 43 is attached to the other end of the bobbin 23 to complete the insulated inductance device.
以上の説明から明らかなように、本発明は、１
次側巻線と２次側巻線との間に含浸性の良好な多
孔質層を介在配設したので、液状の絶縁樹脂をそ
の多孔質層内に迅速かつ確実に浸透させることが
でき、従つて１次側・２次側の各巻線間の耐絶縁
特性、耐電圧特性の向上を図ることができる。 As is clear from the above description, the present invention has the following features:
Since a porous layer with good impregnability is interposed between the primary winding and the secondary winding, the liquid insulating resin can quickly and reliably penetrate into the porous layer. Therefore, it is possible to improve the insulation resistance and voltage resistance characteristics between the primary and secondary windings.
また本発明は、ボビンの鍔部に上記多孔質層内
を通つて鍔部と巻装部との空間部内に注入された
絶縁樹脂が上記空間部外に流れ落ちないようにシ
ール用樹脂を付着したので、上記空間部及びこの
空間部と反対側の空間部内にも絶縁樹脂で充満さ
せることができる。このため巻装部全体を絶縁樹
脂で一体的に固化させることができ、従つて引出
し線と各箔状導体との間等の沿面距離を充分確保
することができる。従つて従来のような引出し線
へのビニールチユーブの被着を不要とすることが
できるため、安価に製造できしかも装置全体の小
型化を可能にするものである。 The present invention also provides a sealing resin attached to the flange of the bobbin so that the insulating resin injected into the space between the flange and the winding part through the porous layer does not flow out of the space. Therefore, the space and the space on the opposite side of the space can also be filled with the insulating resin. Therefore, the entire winding part can be integrally solidified with the insulating resin, and therefore a sufficient creepage distance between the lead wire and each foil conductor can be ensured. Therefore, since it is not necessary to attach a vinyl tube to the lead wire as in the conventional case, it is possible to manufacture the device at low cost and to downsize the entire device.
特に本発明は、鍔部と巻装部の最外周絶縁材の
端部との間に上記巻装部を取り巻くように光硬化
型のシール用樹脂を付着させてなるので、上記巻
装部に含浸される樹脂を確実且つ容易にシールで
きる。すなわち、上記光硬化型のシール用樹脂
は、光の照射によつて迅速に硬化させることが
で、巻装部に含浸される樹脂を確実且つ容易にシ
ールできる。従つて、巻装部に含浸される樹脂の
漏出を防止して確実な熱硬化を達成し得る。さら
に、従来のものに用いられている熱硬化型の樹脂
の如く部分的に加熱して硬化させる必要がないの
で、作業性も極めて良好となる。 In particular, in the present invention, a photo-curable sealing resin is attached between the collar portion and the end of the outermost insulating material of the wrapping portion so as to surround the wrapping portion. The impregnated resin can be reliably and easily sealed. That is, the photocurable sealing resin can be rapidly cured by light irradiation, thereby reliably and easily sealing the resin impregnated into the wrapping portion. Therefore, leakage of the resin impregnated into the wrapped portion can be prevented and reliable thermal curing can be achieved. Furthermore, unlike thermosetting resins used in conventional products, there is no need to partially heat and harden the resin, so workability is also extremely good.
第１図は従来の絶縁型インダクタンス装置を示
す斜視図、第２図は上記インダクタンス装置内部
の絶縁状態を示す要部断面図である。第３図は本
発明の絶縁型インダクタンス装置内部の絶縁状態
を示す要部断面図である。
２２……コア、２３……ボビン、２４，４３…
…鍔部、２５……巻装部、２６ａ，２６ｂ，３１
ａ，３１ｂ……各箔状導体、２７ａ，２７ｂ，３
２ａ，３２ｂ……層間絶縁材、２８……１次側巻
線、３０……多孔質層、３３……２次側巻線、３
４〜３７……各引出し線、４１……シール用樹
脂。
FIG. 1 is a perspective view showing a conventional insulated inductance device, and FIG. 2 is a sectional view of essential parts showing the insulation state inside the inductance device. FIG. 3 is a sectional view of essential parts showing the insulation state inside the insulated inductance device of the present invention. 22... Core, 23... Bobbin, 24, 43...
...Flame part, 25...Wrapping part, 26a, 26b, 31
a, 31b... each foil conductor, 27a, 27b, 3
2a, 32b...Interlayer insulation material, 28...Primary winding, 30...Porous layer, 33...Secondary winding, 3
4 to 37...Each leader line, 41...Sealing resin.
Claims (1)
次側・２次側の各巻線を層間絶縁部材を介して巻
回して巻装部を形成し、上記１次側巻線と２次側
巻線との間に含浸性の良好な多孔質層を介在配設
すると共に、上記鍔部と上記巻装部の最外周絶縁
材の端部との間に上記巻装部を取り巻くように光
硬化型のシール用樹脂を付着し、上記多孔質層内
に含浸された熱硬化型の絶縁樹脂で上記多孔質層
を含む巻装部全体を一体的に固化するようにした
ことを特徴とする絶縁型インダクタンス装置。1 on a bobbin having a flange on at least one end
Each of the secondary and secondary windings is wound through an interlayer insulating member to form a winding part, and a porous layer with good impregnability is formed between the primary and secondary windings. is interposed therebetween, and a photocurable sealing resin is attached between the collar portion and the end of the outermost insulating material of the wrapping portion so as to surround the wrapping portion, and the porous layer is 1. An insulated inductance device characterized in that the entire winding portion including the porous layer is solidified integrally with a thermosetting insulating resin impregnated therein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14108179A JPS5664410A (en) | 1979-10-31 | 1979-10-31 | Insulated inductance unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14108179A JPS5664410A (en) | 1979-10-31 | 1979-10-31 | Insulated inductance unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5664410A JPS5664410A (en) | 1981-06-01 |
| JPH0118562B2 true JPH0118562B2 (en) | 1989-04-06 |
Family
ID=15283760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14108179A Granted JPS5664410A (en) | 1979-10-31 | 1979-10-31 | Insulated inductance unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5664410A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3305421B2 (en) * | 1993-05-21 | 2002-07-22 | 三菱電機株式会社 | Synthetic resin mold type transformer and method of forming the same |
| JP4726259B2 (en) * | 2009-01-26 | 2011-07-20 | 大和クレス株式会社 | Road widening structure |
| JP4827203B2 (en) * | 2009-01-26 | 2011-11-30 | 大和クレス株式会社 | Road widening structure |
| US11250982B2 (en) * | 2018-06-29 | 2022-02-15 | Cyntec Co., Ltd | Ingress-protective mechanism of wire-wound magnetic component |
| CN111326330A (en) * | 2020-04-10 | 2020-06-23 | 上海联影医疗科技有限公司 | Coil assembly, pulse transformer and medical equipment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54124217A (en) * | 1978-03-20 | 1979-09-27 | Hitachi Ltd | Mold coil manufacturing method |
-
1979
- 1979-10-31 JP JP14108179A patent/JPS5664410A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54124217A (en) * | 1978-03-20 | 1979-09-27 | Hitachi Ltd | Mold coil manufacturing method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5664410A (en) | 1981-06-01 |
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