JPH0669062A - Laminated capacitor - Google Patents
Laminated capacitorInfo
- Publication number
- JPH0669062A JPH0669062A JP4237776A JP23777692A JPH0669062A JP H0669062 A JPH0669062 A JP H0669062A JP 4237776 A JP4237776 A JP 4237776A JP 23777692 A JP23777692 A JP 23777692A JP H0669062 A JPH0669062 A JP H0669062A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- laminated body
- dielectric breakdown
- electrodes
- laminated
- 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
- 239000003990 capacitor Substances 0.000 title claims abstract description 16
- 230000015556 catabolic process Effects 0.000 abstract description 20
- 238000000034 method Methods 0.000 abstract description 3
- 230000005684 electric field Effects 0.000 description 10
- 239000003985 ceramic capacitor Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
Landscapes
- Ceramic Capacitors (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、積層コンデンサ、更
に詳しくは気中での表面絶縁破壊電圧値を上げ、信頼性
を向上させた積層コンデンサに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multilayer capacitor, and more particularly to a multilayer capacitor having an increased surface dielectric breakdown voltage value in the air and improved reliability.
【０００２】[0002]
【従来の技術】積層セラミックコンデンサの一般的な構
造は、図４と図５に示す如く、表面に内部電極１を一方
の端部に達するように設けた複数枚のセラミック誘電体
素子２を用い、この誘電体素子２を内部電極１が交互の
向きになるよう順次重ね合わせて積層し、更に上下両面
に外装用誘電体素子３，３を重ねた状態でこれを加圧焼
成した後、積層体４の両端に外部電極５，５を対応する
内部電極１と導通するように設けたものである。2. Description of the Related Art A general structure of a monolithic ceramic capacitor uses, as shown in FIGS. 4 and 5, a plurality of ceramic dielectric elements 2 each having an internal electrode 1 provided on the surface so as to reach one end. The dielectric elements 2 are sequentially stacked and laminated so that the internal electrodes 1 are in alternate directions, and the exterior dielectric elements 3, 3 are stacked on the upper and lower surfaces, and then pressure-fired. External electrodes 5 and 5 are provided at both ends of the body 4 so as to be electrically connected to the corresponding internal electrodes 1.
【０００３】上記のような積層コンデンサにおいて、そ
の特性を向上させる方法として、気中での表面絶縁破壊
の発生を防止する必要があり、表面絶縁破壊は、内部電
極１と対向外部電極５又は５間の電界により発生する。In the multilayer capacitor as described above, it is necessary to prevent the occurrence of surface dielectric breakdown in the air as a method for improving its characteristics. The surface dielectric breakdown is caused by the internal electrode 1 and the opposing external electrode 5 or 5. It is generated by the electric field between them.
【０００４】従来、積層コンデンサの表面絶縁破壊電圧
値を上げ、表面絶縁破壊を防止する方法として、図４と
図５に示したように、最外層電極１ａ，１ａと対向外部
電極５，５間の距離を積層体の全長の略２分の１に設定
するものが特開昭５７−１７６７１５号によって提案さ
れている。Conventionally, as a method of increasing the surface dielectric breakdown voltage value of a multilayer capacitor to prevent the surface dielectric breakdown, as shown in FIGS. 4 and 5, between the outermost layer electrodes 1a, 1a and the opposing external electrodes 5, 5, as shown in FIG. Japanese Patent Laid-Open No. 176715/1982 proposes that the distance is set to about 1/2 of the total length of the laminate.
【０００５】上記のように、最外層内部電極１ａ，１ａ
の外部電極５，５に対する距離を大きくして例えば２０
０mm以上の距離をとる構造は、対向外部電極５，５との
距離（図４中のａ−ｘ間）が長くなり、この距離が適当
な範囲で長くなるとａ−ｘ間の電界が弱くなり、表面絶
縁破壊に対して効果はある。As described above, the outermost layer internal electrodes 1a, 1a
The distance from the external electrodes 5, 5 to 20
In the structure having a distance of 0 mm or more, the distance between the opposing external electrodes 5 and 5 (between a and x in FIG. 4) becomes long, and if this distance becomes long within a proper range, the electric field between a and x becomes weak. , Effective against surface dielectric breakdown.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記の
ような構造では、最外層内部電極と外部電極との距離を
ある寸法以上にすると効果が見られなくなる。However, in the above structure, the effect cannot be obtained when the distance between the outermost inner electrode and the outer electrode is a certain dimension or more.
【０００７】また、積層体の両端に設ける外部電極５，
５は図４に示すように、積層体の端面だけでなく周囲に
わたっても設けられ、この外部電極５，５の積層体の長
さ方向に沿う電極寸法ｅが大きくなると、実質的に図５
中のｃ−ｘ間の距離が短かくなり、その分だけ電界が強
くなり、信頼性が低くなるという問題がある。Further, the external electrodes 5 provided at both ends of the laminate 5,
As shown in FIG. 4, 5 is provided not only on the end face of the laminated body but also on the periphery thereof, and when the electrode dimension e of the external electrodes 5 and 5 along the longitudinal direction of the laminated body becomes large, substantially FIG.
There is a problem that the distance between c and x in the inside becomes short, the electric field becomes strong correspondingly, and the reliability becomes low.
【０００８】そこで、この発明の課題は、最外層内部電
極と対向外部電極間を一定の距離に設定すると共に、外
部電極の電極寸法を一定寸法の範囲に設定することによ
り、完全に表面絶縁破壊を防止することができる積層コ
ンデンサを提供することを目的としている。Therefore, an object of the present invention is to set a constant distance between the outermost layer internal electrode and the counter external electrode, and to set the electrode size of the external electrode within a fixed size range, whereby the surface dielectric breakdown is completed. An object of the present invention is to provide a multilayer capacitor capable of preventing the above.
【０００９】[0009]
【課題を解決するための手段】上記のような課題を解決
するため、この発明は、最外装の内部電極と対向する外
部電極間の距離を積層体の全長の０．２５〜０．７５の
範囲に設定すると共に、外部電極の積層体の長さに沿う
方向の電極寸法を積層体の全長の０．２以下に設定した
構成を採用したものである。In order to solve the above-mentioned problems, the present invention sets the distance between the outermost internal electrode and the opposing external electrode to be 0.25 to 0.75 of the total length of the laminate. The range is set and the electrode dimension in the direction along the length of the laminated body of the external electrodes is set to 0.2 or less of the total length of the laminated body.
【００１０】[0010]
【作用】最外層の内部電極と対向電極の距離を積層体の
全長の０．２５〜０．７５の範囲に設定すると共に、外
部電極の積層体の長さに沿う方向の電極寸法を積層体の
全長の０．２以下と設定することにより、最外層内部電
極と対向外部電極の関係が一定の範囲になり、外部電極
の電極寸法がある範囲で変動しても気中での表面絶縁破
壊電圧値を上げることができ、表面絶縁破壊を防止して
信頼性が得られる。The distance between the innermost electrode of the outermost layer and the counter electrode is set within the range of 0.25 to 0.75 of the total length of the laminated body, and the electrode dimension in the direction along the length of the laminated body of the outer electrode is determined. By setting the length to 0.2 or less of the total length, the relationship between the outermost layer internal electrode and the counter external electrode is within a certain range, and even if the electrode size of the external electrode fluctuates within a certain range, surface dielectric breakdown in the air The voltage value can be increased, surface dielectric breakdown can be prevented, and reliability can be obtained.
【００１１】[0011]
【実施例】以下、この発明の実施例を添付図面の図１乃
至図３に基づいて説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
【００１２】図１のように、積層セラミックコンデンサ
１１は、表面に内部電極１２を一方の端部に達するよう
に設けた複数枚のセラミック誘電体素子１３を用い、こ
の誘電体素子１３を内部電極１２が交互の向きになるよ
う順次重ね合わせて積層し、更に上下両面に外装用誘電
体素子１４，１４を重ねてこれを加圧焼成した後、この
積層体１５の両端に外部電極１６，１６を対応する内部
電極１２と導通するように設けて形成されている。As shown in FIG. 1, a monolithic ceramic capacitor 11 uses a plurality of ceramic dielectric elements 13 provided with internal electrodes 12 on one surface so as to reach one end. 12 are stacked one on top of the other in such a manner that they are oriented in an alternating direction. Further, the exterior dielectric elements 14 and 14 are stacked on both upper and lower surfaces, and this is pressure-fired. Are formed so as to be electrically connected to the corresponding internal electrodes 12.
【００１３】上記積層コンデンサ１１において、最外層
の内部電極１２ａと対向外部電極１６，１６間の距離Ｇ
は、積層体１５の全長Ｌに対して０．２５〜０．７５の
範囲に設定し、内部電極１２ａと対向外部電極１６の図
１中ａ−ｘ間を長くすることによりａ−ｘ間の電界が弱
くなり、表面絶縁破壊を防止している。In the above multilayer capacitor 11, the distance G between the innermost electrode 12a of the outermost layer and the opposing outer electrodes 16, 16 is G.
Is set in the range of 0.25 to 0.75 with respect to the total length L of the laminated body 15, and the distance between ax of the internal electrode 12a and the counter external electrode 16 in FIG. The electric field is weakened to prevent surface dielectric breakdown.
【００１４】また、外部電極１６，１６において、積層
体１５の長さ方向に沿う電極寸法ｅが積層体１５の全長
Ｌに対して０．２以下に設定されている。Further, in the external electrodes 16 and 16, the electrode dimension e along the length direction of the laminated body 15 is set to 0.2 or less with respect to the total length L of the laminated body 15.
【００１５】図２は図１で示した積層コンデンサにおい
て、最外層の内部電極１２ａと対向外部電極１６間の距
離Ｇを変えたときの表面電界強度を示し、同図から明ら
かなように、距離Ｇが積層体の全長Ｌに対して０．２５
〜０．７５の範囲では電界強度が低くなり、表面絶縁破
壊電圧が高く、上下面の表面絶縁破壊に対して効果があ
り、上記の範囲を外れると、これとは逆に電界強度が高
くなり、表面絶縁破壊が発生する。FIG. 2 shows the surface electric field strength when the distance G between the innermost outer electrode 12a and the counter outer electrode 16 in the multilayer capacitor shown in FIG. 1 is changed. G is 0.25 with respect to the total length L of the laminated body
In the range of up to 0.75, the electric field strength is low, the surface breakdown voltage is high, and it has an effect on the surface breakdown of the upper and lower surfaces. Outside the above range, the electric field strength is high. , Surface dielectric breakdown occurs.
【００１６】図３は、上記した最外層の内部電極１２ａ
と対向外部電極１６間の距離Ｇに対して更に外部電極１
６の電極寸法ｅを加えた条件での表面電界強度を示し、
同図の如く、外部電極１６の電極寸法ｅが大きくなる
と、最外層内部電極１２ａの構造の影響が小さくなり、
表面電界強度が高くなって表面絶縁破壊が発生すること
が分かる。FIG. 3 shows the outermost inner electrode 12a.
For the distance G between the opposite external electrode 16 and the external electrode 1
6 shows the surface electric field strength under the condition that the electrode dimension e of 6 is added,
As shown in the figure, when the electrode dimension e of the external electrode 16 increases, the influence of the structure of the outermost layer internal electrode 12a decreases,
It can be seen that the surface electric field strength increases and surface dielectric breakdown occurs.
【００１７】次に、最外層内部電極１２ａと対向外部電
極１６の距離Ｇと外部電極１６の電極寸法ｅの組合せに
よる信頼性故障率の測定結果を表１に示す。Next, Table 1 shows the measurement results of the reliability failure rate by the combination of the distance G between the outermost layer internal electrode 12a and the opposing external electrode 16 and the electrode dimension e of the external electrode 16.
【００１８】[0018]
【表１】 [Table 1]
【００１９】上記測定結果から明らかなように、最外層
内部電極１２ａと対向外部電極１６の距離Ｇを積層体１
５の全長Ｌに対して０．２５〜０．７５に設定すると共
に、外部電極１６の電極寸法ｅを積層体の全長Ｌに対し
て０．２以下に設定すると、故障率が低く高い信頼性が
得られることが分かる。As is clear from the above measurement results, the distance G between the outermost layer inner electrode 12a and the counter outer electrode 16 is set to the laminate 1
5 is set to 0.25 to 0.75 with respect to the total length L of 5 and the electrode dimension e of the external electrode 16 is set to 0.2 or less with respect to the total length L of the laminated body, the failure rate is low and the reliability is high. It turns out that
【００２０】[0020]
【発明の効果】以上のように、この発明によると、最外
層内部電極と対向外部電極の距離を積層体の全長の０．
２５〜０．７５の範囲に設定すると共に、外部電極の積
層体の長さに沿う電極寸法を積層体の全長の０．２以下
に設定したので、気中での表面絶縁破壊電圧値が高くな
り、表面絶縁破壊を防止することができ、積層コンデン
サの信頼性を大幅に向上させることができる。As described above, according to the present invention, the distance between the outermost layer inner electrode and the counter outer electrode is set to 0.
Since the electrode dimension along the length of the laminated body of the external electrodes is set to 0.2 or less of the total length of the laminated body while setting the range of 25 to 0.75, the surface dielectric breakdown voltage value in the air is high. Therefore, surface dielectric breakdown can be prevented, and the reliability of the multilayer capacitor can be greatly improved.
【図１】（Ａ）はこの発明の積層コンデンサの縦断面
図、（Ｂ）は同上の横断平面図である。FIG. 1A is a vertical sectional view of a multilayer capacitor of the present invention, and FIG. 1B is a transverse plan view of the same.
【図２】電界強度の関係を示すグラフである。FIG. 2 is a graph showing a relationship of electric field strength.
【図３】同上に外部電極寸法を加えたグラフである。FIG. 3 is a graph in which external electrode dimensions are added to the above.
【図４】従来の積層コンデンサを示す縦断面図である。FIG. 4 is a vertical sectional view showing a conventional multilayer capacitor.
【図５】同上の横断平面図である。FIG. 5 is a transverse plan view of the above.
１１ 積層セラミックコンデンサ １２ 内部電極 １３ 誘電体素子 １５ 積層体 １６ 外部電極 11 Multilayer Ceramic Capacitor 12 Internal Electrode 13 Dielectric Element 15 Multilayer 16 External Electrode
Claims (1)
うに設けた複数枚の誘電体素子を内部電極が交互の向き
になるよう順次重ね合わせて積層し、この積層体の両端
に外部電極を対応する内部電極と導通するように設けた
積層コンデンサにおいて、最外装の内部電極と対向する
外部電極間の距離を積層体の全長の０．２５〜０．７５
の範囲に設定すると共に、外部電極の積層体の長さに沿
う方向の電極寸法を積層体の全長の０．２以下に設定し
たことを特徴とする積層コンデンサ。1. A plurality of dielectric elements provided with internal electrodes on one surface so as to reach one end are sequentially laminated so that the internal electrodes are in alternate directions, and externally provided at both ends of the laminated body. In the multilayer capacitor in which the electrodes are provided so as to be electrically connected to the corresponding internal electrodes, the distance between the outermost internal electrode and the facing external electrode is 0.25 to 0.75 of the total length of the multilayer body.
And the electrode dimension in the direction along the length of the laminated body of external electrodes is set to 0.2 or less of the total length of the laminated body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4237776A JPH0669062A (en) | 1992-08-12 | 1992-08-12 | Laminated capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4237776A JPH0669062A (en) | 1992-08-12 | 1992-08-12 | Laminated capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0669062A true JPH0669062A (en) | 1994-03-11 |
Family
ID=17020265
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4237776A Pending JPH0669062A (en) | 1992-08-12 | 1992-08-12 | Laminated capacitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0669062A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09266130A (en) * | 1996-03-27 | 1997-10-07 | Taiyo Yuden Co Ltd | Multilayer capacitor |
| US9378890B2 (en) | 2012-03-16 | 2016-06-28 | Murata Manufacturing Co., Ltd. | Ceramic capacitor having a small variation in capacity |
-
1992
- 1992-08-12 JP JP4237776A patent/JPH0669062A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09266130A (en) * | 1996-03-27 | 1997-10-07 | Taiyo Yuden Co Ltd | Multilayer capacitor |
| US9378890B2 (en) | 2012-03-16 | 2016-06-28 | Murata Manufacturing Co., Ltd. | Ceramic capacitor having a small variation in capacity |
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