JPS58103118A - Porcelain condenser and method of producing same - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【発明の詳細な説明】 本発明は、中高圧の積層形コンデンサとして好適な磁器
コンデンサ及びその製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ceramic capacitor suitable as a medium-high voltage multilayer capacitor and a method for manufacturing the same.

従来の積層形コンデンサは、一般に、適当な誘電体磁器
材料より構成された磁器基板の内部に、パラジウム、白
金もしくはこれらの合金またはこれらと銀の合金等より
成る複数の内部電極を、誘電体磁器層を介して層状に埋
設した構造となっていた。しかし、この従来の積層形コ
ンデンサにおいて、中高圧コンデンサを得ようとする場
合、電極間にある誘電体磁器層の層厚を例えば０．５〜
２．０ｍｍ程度の厚い層にしなければならないため、積
層化工程のシートスタック時等に、誘電体磁器基板に加
わる加圧力のアンバランス、基板の中央と端部における
加熱のアンバランス等を生じ、これが内部欠陥を発生さ
せ、歩留りを低下させるという不具合があった。しかも
、このような内部欠陥を生じた場合、その内部欠陥のあ
る部分に留らず、コンデンサ全体が不良品となってしま
うため、非常に効率が悪かった。Conventional multilayer capacitors generally have a plurality of internal electrodes made of palladium, platinum, an alloy of these, or an alloy of these and silver inside a ceramic substrate made of a suitable dielectric ceramic material. It had a structure in which it was buried in layers. However, in this conventional multilayer capacitor, when trying to obtain a medium-high voltage capacitor, the layer thickness of the dielectric ceramic layer between the electrodes is, for example, 0.5 to
Because the layer must be about 2.0 mm thick, it causes an imbalance in the pressure applied to the dielectric ceramic substrate during sheet stacking in the lamination process, and an imbalance in heating between the center and the edges of the substrate. There was a problem that this caused internal defects and lowered the yield. Furthermore, when such an internal defect occurs, the entire capacitor becomes defective, not just the part with the internal defect, resulting in extremely low efficiency.

また、従未必積層形コンデンサは、その製造方法により
、積層数、形状等が定まってしまうため、数十ＩＬＦ程
度の大容量を取得するのは非常に困難であった。Furthermore, in conventional multilayer capacitors, the number of laminated layers, shape, etc. are determined by the manufacturing method, so it is very difficult to obtain a large capacity of about several tens of ILF.

しかも、誘電体磁器層と内部電極とを交互に積層する必
要があるため、製造が容易でなく、積層化工程において
、内部電極の印刷位置ズレ、誘電体磁器層の層厚の変動
を招き、取得容量がバラツキ易い。この欠点は、積層数
を増加して大容量化を図る程により顕著になる。Moreover, since the dielectric ceramic layers and the internal electrodes must be alternately laminated, manufacturing is not easy, and in the lamination process, the printing position of the internal electrodes may be misaligned, and the layer thickness of the dielectric ceramic layers may vary. Acquired capacity tends to vary. This drawback becomes more noticeable as the number of laminated layers increases to increase capacity.

更に、積層数を増加させて大容量化を図る程に、内部電
極を構成する高価なパラジウム、白金またはその合金の
使用量が多くなり、大幅なコストアップを招く欠点もあ
った。Furthermore, as the number of laminated layers is increased to increase the capacity, the amount of expensive palladium, platinum, or their alloys constituting the internal electrodes increases, resulting in a significant cost increase.

本発明は上述する従来の欠点を除去し、耐電圧が高く、
中高圧コンデンサとして好適であり、しかも積層組立が
容易で、量産に適する大容量かつ安価な磁器コンデンサ
及びこの磁器コンデンサを製造するのに好適な製造方法
を提供することを目的とする。The present invention eliminates the above-mentioned conventional drawbacks, has a high withstand voltage,
It is an object of the present invention to provide a large-capacity and inexpensive ceramic capacitor that is suitable as a medium-high voltage capacitor, easy to stack and assemble, and suitable for mass production, and a manufacturing method suitable for manufacturing the ceramic capacitor.

Ｌ足口的を達成するため、本発明に係る磁器コンデンサ
は、磁器基板の両面にそれぞれ電極を有し、これらの電
極の相反する一端部を前記磁器基板の両端部に設けた端
部電極にそれぞれ導通接続させたコンデンサ素子の複数
個を、絶縁物を間に挟んで重ね合せ、かつ並列に接続し
たことを特徴とする。In order to achieve this, the ceramic capacitor according to the present invention has electrodes on both sides of a ceramic substrate, and opposite ends of these electrodes are connected to end electrodes provided at both ends of the ceramic substrate. It is characterized in that a plurality of capacitor elements, each electrically connected, are stacked with an insulator in between and connected in parallel.

また、この磁器コンデンサを得るための本発明に係る製
造方法は、磁器基板の厚さ方向の両面にそれぞれ電極を
有し、これらの電極の相反する一端部を前記磁器基板の
両端部に設けた端部電極にそれぞれ導通接続させた複数
個のコンデ、？す素子を、前記電極の一つが互いに向き
合うようにかつ前記端部電極が互い違いになるように配
置して絶縁性接着剤によって互いに固定し、その後に同
一方向にある前記端部電極を互いに導通接続することを
特徴とする。Further, the manufacturing method according to the present invention for obtaining this ceramic capacitor includes electrodes on both sides of the ceramic substrate in the thickness direction, and opposite ends of these electrodes are provided on both ends of the ceramic substrate. Multiple capacitors each electrically connected to the end electrode? The elements are arranged such that one of the electrodes faces each other and the end electrodes are staggered and fixed to each other with an insulating adhesive, and then the end electrodes in the same direction are electrically connected to each other. It is characterized by

以下実施例たる添付図面を参照し、本発明の内容を具体
的に説明する。第１図は本発明に係る磁器コンデンサの
斜視図、第２図は同じくその正面断面図である。図にお
いて、１はコンデンサ素子＋複数個備えられる。このコ
ンデンサ素子ｌの各々は、第３図及び第４図にも示すよ
うに、矩形平板状に形成された誘電体磁器基板２の厚さ
方向の両面に電極３．４をそれぞれ被着形成すると共に
、この電極３及び電極４の相反する一端を、前記磁器基
板２の相対する両端部に設けた端部電極５及び端部電極
６にそれぞれ導通接続させである。前記電極３．４及び
端部電極５．６は、従来の内部電極と異なって、磁器基
板２の焼成後に被着形成することができるから、従来の
白金、パラジウムまたはそれらの合金等に代えて、銀ま
たは銅もしくはニッケル等の卑金属等を導電成分とする
導電性ペーストを使用することが可能になり、電極形成
コストが大幅に低減される。DESCRIPTION OF THE PREFERRED EMBODIMENTS The content of the present invention will be specifically described below with reference to the accompanying drawings, which are examples. FIG. 1 is a perspective view of a ceramic capacitor according to the present invention, and FIG. 2 is a front sectional view thereof. In the figure, 1 is provided with a capacitor element plus a plurality of capacitor elements. As shown in FIGS. 3 and 4, each of the capacitor elements 1 has electrodes 3.4 adhered to both sides in the thickness direction of a dielectric ceramic substrate 2 formed in a rectangular flat plate shape. At the same time, opposing ends of the electrodes 3 and 4 are electrically connected to an end electrode 5 and an end electrode 6 provided at opposite ends of the ceramic substrate 2, respectively. Unlike conventional internal electrodes, the electrodes 3.4 and end electrodes 5.6 can be formed after firing the ceramic substrate 2, so they can be formed using platinum, palladium, alloys thereof, etc. It becomes possible to use a conductive paste containing a base metal such as silver, copper, or nickel as a conductive component, and the electrode formation cost is significantly reduced.

前記コンデンサ素子１の各々は、前記端部電極５．６を
互い違いに、かつ電極３と電極４とが互いに対向するよ
うに配置すると共に、電極３と電極４との間に絶縁体７
を介在させて順次重ね合せである。そして、コンデンサ
素子ｌの各々の端部電極５及び端部電極６を導体８によ
って互いに導通接続し、この導体８にリード線９．１０
を接続固定すると共に、全体を絶縁ケース１１内に挿入
し、絶縁樹脂１２を充填した構造となっている。Each of the capacitor elements 1 has the end electrodes 5.6 arranged alternately and the electrodes 3 and 4 facing each other, and an insulator 7 between the electrodes 3 and 4.
They are sequentially superimposed with . Then, each end electrode 5 and end electrode 6 of the capacitor element l are conductively connected to each other by a conductor 8, and a lead wire 9.10 is connected to the conductor 8.
are connected and fixed, and the whole is inserted into an insulating case 11 and filled with an insulating resin 12.

前記導体８は半日またはアルミニュウム、鉛等の溶射に
よって形成し、隣接するコンデンサ素子ｌの端部電極５
−６間がブリッジ結合されるように被着させる。The conductor 8 is formed by half-spraying or thermal spraying of aluminum, lead, etc., and is formed on the end electrode 5 of the adjacent capacitor element l.
-6 is bonded so that it is bridge-coupled.

上述のような構造であると、コンデンサ素子１の各々を
並列に接続した第５図のような回路構成の磁器コンデン
サが得られる。この場合、本発明においては、既に完成
されたコンデンサ素子１を順次積層して行けばよいので
、トータル取得容量を増大させるには、単純にコンデン
サ素子ｌの個数を増大させるだけでよく、製造上の゛制
限を受けることなく、取得容量を簡単に増大させること
ができる。また、゛完成したコンデンサ素子ｌを重ねて
村けばよいので、磁器基板２を厚くして耐電圧を増大さ
せても、従来のものと異なって、積層時の加圧力ゆ加熱
のアンバランスによる不具合を生じる余地もない。しか
も、積層時の電極位置ズレによる容量のバラツキを生じ
る余地がなく、容量のバラツキを、コンデンサ素子１の
各々の精度に依存した非常に小さな値に収めることがで
きる。With the above structure, a ceramic capacitor having a circuit configuration as shown in FIG. 5 in which each of the capacitor elements 1 is connected in parallel can be obtained. In this case, in the present invention, the capacitor elements 1 that have already been completed can be stacked one after another, so in order to increase the total acquired capacity, it is sufficient to simply increase the number of capacitor elements 1, and the manufacturing The acquisition capacity can be easily increased without being subject to any limitations. In addition, since the completed capacitor elements 1 can be stacked one on top of the other, even if the ceramic substrate 2 is made thicker to increase the withstand voltage, unlike the conventional method, it is possible to avoid the unbalance of heating due to pressure during stacking. There is no room for any problems. Moreover, there is no room for variation in capacitance due to positional deviation of the electrodes during stacking, and variation in capacitance can be kept to a very small value that depends on the accuracy of each capacitor element 1.

更に、１個またはそれ以上の個数のコンデンサ素子１が
不良となった場合、その不良品を取代えるだけでよいの
で、歩留りが向上する。このため、本発明によれば、耐
電圧が高く、取得容量の大きい安価な磁器コンデンサを
提供することが可能になる。Furthermore, if one or more capacitor elements 1 become defective, it is only necessary to replace the defective products, which improves the yield. Therefore, according to the present invention, it is possible to provide an inexpensive ceramic capacitor that has a high withstand voltage and a large acquisition capacity.

次に第６図を参照して本発明に係る磁器コンデンサの製
造方法を説明する。まず、第６図（Ａ）に示すように、
矩形平板状に形成された誘電体磁器基板２の厚さ方向の
両面に電極゛３，４をそれぞれ被着形成すると共に、こ
の電極３及び電極４の相反する一端を、前記磁器基板２
の相対する両端部に設けた端部電極５及び端部電極６に
それぞれ導通接続させたコンデンサ素子ｌを、必要な枚
数だけ用意する。そして、これらのコンデンサ素子１の
各々を、前記端部電極５．６が互い違いに、かつ電８ｉ
３と電極４とが互いに対向するように配置し、電極３と
電極４のほぼ中央部に絶縁耐熱性の接着剤１３を塗布し
、第Ｂ図（Ｂ）に示すように、コンデンサ素子ｌの各々
を互いに接着固定する。この接着剤１３は前記絶縁体７
となるものである。Next, a method for manufacturing a ceramic capacitor according to the present invention will be explained with reference to FIG. First, as shown in Figure 6(A),
Electrodes 3 and 4 are formed on both sides in the thickness direction of a dielectric ceramic substrate 2 formed into a rectangular flat plate shape, and opposite ends of the electrodes 3 and 4 are connected to the ceramic substrate 2.
A required number of capacitor elements L each electrically connected to the end electrodes 5 and 6 provided at opposite ends of the capacitor element 1 are prepared. Each of these capacitor elements 1 is arranged such that the end electrodes 5.6 are arranged alternately and the electrodes 8i
3 and electrode 4 are arranged so as to face each other, and an insulating heat-resistant adhesive 13 is applied to the approximate center of electrode 3 and electrode 4, and as shown in FIG. Each is glued and fixed to each other. This adhesive 13 is applied to the insulator 7.
This is the result.

次に第６図（Ｃ）に示すように、半田浸漬法などの手段
によって各コンデンサ素子ｌの端部電極５−６間に導体
８を被着させる。端部電極５−６間には少々の隙間があ
るけれども、半田の粘性によるブリッジがこの隙間に形
成され、端部電極５−６が互いに導通接続される。なお
、半田浸漬法の代りに金属溶射法を用いてもよい。Next, as shown in FIG. 6(C), a conductor 8 is attached between the end electrodes 5-6 of each capacitor element 1 by means such as solder dipping. Although there is a slight gap between the end electrodes 5-6, a bridge is formed in this gap due to the viscosity of the solder, and the end electrodes 5-6 are electrically connected to each other. Note that a metal spraying method may be used instead of the solder dipping method.

次に端部電極５，６にリード線９．１０をそれぞれ半田
付けした後、第６図（Ｄ）に示すように、全体を絶縁ケ
ース１１内に挿入し、第６図（Ｅ）に示すように絶縁ケ
ース１１の内部に絶縁樹脂１２を充填することにより、
第１図及び第２図に示した磁器コンデンサの完成品が得
られる。Next, after soldering the lead wires 9 and 10 to the end electrodes 5 and 6, respectively, the whole is inserted into the insulating case 11 as shown in FIG. 6(D), and as shown in FIG. 6(E). By filling the inside of the insulating case 11 with the insulating resin 12,
A finished product of the ceramic capacitor shown in FIGS. 1 and 2 is obtained.

以上述べたよう、に、本発明に係る磁器コンデンサは、
磁器基板の両面にそれぞれ電極を有し、これらの電極の
相反する一端部を前記磁器基板の両端部に設けた端部電
極にそれぞれ導通接続させたコンデンサ素子の複数個を
、絶縁物を間に挟んで重ね合せ、かつ並夕１目こ接続し
たことを特徴とするから、耐電圧が高く、中高圧コンデ
ンサとして好適であり、しかも積層組立が容易で、量産
に適する大容量かつ安価な磁器コンデンサを提供するこ
とができる。As described above, the ceramic capacitor according to the present invention is
A plurality of capacitor elements each having electrodes on both sides of a ceramic substrate and opposite ends of these electrodes being conductively connected to end electrodes provided at both ends of the ceramic substrate are connected with an insulator between them. It is a large-capacity, inexpensive porcelain capacitor that is sandwiched, stacked, and connected in parallel, so it has a high withstand voltage and is suitable as a medium-high voltage capacitor.Moreover, it is easy to stack and assemble, and is suitable for mass production. can be provided.

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

第１図は本発明に係る磁器コンデンサの斜視図、第２図
は同じくその正面断面図、第３図は同じくそのコンデン
サ素子の斜視図、第４図は同じくその正面断面図、第５
図は同じくその等価回路図、′第６図（Ａ）乃至（Ｅ）
は本発明に係る磁器コンデンサの製造方法を示す図であ
る。 ｌ＃・・コンデンサ素子 ２＃・・磁器基板 ３．４・・・電極 ５，６ｅ・・端部電極 ７参・・絶縁体 ８・・・７導体 第１図 ９ 第２図 第３図 第４図 第５図FIG. 1 is a perspective view of a ceramic capacitor according to the present invention, FIG. 2 is a front sectional view thereof, FIG. 3 is a perspective view of the capacitor element, FIG. 4 is a front sectional view thereof, and FIG.
The figure is also the equivalent circuit diagram, 'Figure 6 (A) to (E)
FIG. 3 is a diagram showing a method for manufacturing a ceramic capacitor according to the present invention. l#...Capacitor element 2#...Porcelain substrate 3.4...Electrodes 5, 6e...End electrode 7...Insulator 8...7 Conductor Fig. 1 9 Fig. 2 Fig. 3 Figure 4 Figure 5

Claims (8)

【特許請求の範囲】[Claims] （１）　　磁器基板の両面にそれぞれ電極を有し。 これらの電極の相反する一端部を前記磁器基板の両端部
に設けた端部電極にそれぞれ導通接続させたコンデンサ
素子の複数個を、絶縁物を間に挟ん。 で重ね合せ、かつ並列に接続したこ、とを特徴とする磁
器コンデンサ。(1) Electrodes are provided on both sides of the ceramic substrate. A plurality of capacitor elements, each of which has opposing ends of these electrodes electrically connected to end electrodes provided at both ends of the ceramic substrate, are sandwiched between an insulator. A ceramic capacitor characterized by being stacked and connected in parallel. （２）　前記複数個のコンデンサ素子は、前記端部電極
が￥い違いとなるようにして厚さ方向に重ね合わせ、同
一方向にある前記端部電極を互いに導通接続したことを
特徴とする特許請求の範囲第１項に記載の磁器コンデン
サ。(2) A patent characterized in that the plurality of capacitor elements are stacked in the thickness direction so that the end electrodes are offset, and the end electrodes in the same direction are conductively connected to each other. A ceramic capacitor according to claim 1. （３）　前記端部電極は、半田によって導通接続したこ
とを特徴とする特許請求の範囲第２項に記載の磁器コン
デンサ。(3) The ceramic capacitor according to claim 2, wherein the end electrodes are electrically connected by solder. （４）　前記端部電極は、溶射金属によって導通接続し
たことを特徴とする特許請求の範囲第２項に記載の磁器
コンデンサ。(4) The ceramic capacitor according to claim 2, wherein the end electrode is electrically connected by sprayed metal. （５）　前記端部電極は、リード線を有することを特徴
とする特許請求の範囲第１項、第２項、第３項または第
４項に記載の磁器コンデンサ。(5) The ceramic capacitor according to claim 1, 2, 3, or 4, wherein the end electrode has a lead wire. （６）　全体を絶縁ケース内に収納しかつこの絶縁ケー
ス内に絶縁樹脂を充填したことを特徴とする特許請求の
範囲第１項、第２項、第３項、第４項才たは第５項に記
載の磁器コンデンサ。(6) Claims 1, 2, 3, and 4, characterized in that the entire body is housed in an insulating case, and the insulating case is filled with an insulating resin. The ceramic capacitor according to item 5. （７）　磁器基板の厚さ方向の両面にそれぞれ電極を有
し、これらの電極の相反する一端部を前記磁器基板の両
端部に設けた端部電極にそれぞれ導通接続させた複数個
のコンデンサ素子を、前記電極の一つが互いに向き合う
ようにかつ前記端部電極が互い違いになるように配置し
て絶縁性接着剤によって互いに固定し、その後に同一方
向にある前記端部電極を互いに導通接続す、ることを特
徴とする磁器コンデンサの製造方法。(7) A plurality of capacitor elements each having electrodes on both sides in the thickness direction of a ceramic substrate, and opposite ends of these electrodes being conductively connected to end electrodes provided at both ends of the ceramic substrate. are arranged so that one of the electrodes faces each other and the end electrodes are staggered and fixed to each other with an insulating adhesive, and then the end electrodes in the same direction are electrically connected to each other, A method for manufacturing a ceramic capacitor, characterized by: （８）　前記端部電極を互いに導通接続した後、全体を
絶縁ケース内に挿入し、絶縁樹脂を流し込んで絶縁化す
ることを特徴とする特許請求の範囲第７項に記載の磁器
コンデンサの製造方法。(8) Manufacturing the ceramic capacitor according to claim 7, wherein after the end electrodes are conductively connected to each other, the whole is inserted into an insulating case and insulated by pouring an insulating resin. Method.