JPH08298228A - Laminated capacitor - Google Patents
Laminated capacitorInfo
- Publication number
- JPH08298228A JPH08298228A JP7124398A JP12439895A JPH08298228A JP H08298228 A JPH08298228 A JP H08298228A JP 7124398 A JP7124398 A JP 7124398A JP 12439895 A JP12439895 A JP 12439895A JP H08298228 A JPH08298228 A JP H08298228A
- Authority
- JP
- Japan
- Prior art keywords
- internal electrodes
- electrodes
- electrode
- internal
- internal electrode
- 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
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- Ceramic Capacitors (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、電界集中を緩和して耐
電圧特性を向上させることが可能である積層コンデンサ
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multilayer capacitor capable of relaxing electric field concentration and improving withstand voltage characteristics.
【0002】[0002]
【従来の技術】積層コンデンサは、セラミックスの積層
体内部に、相対向する両端面に一層ずつ交互に引き出さ
れた内部電極を有し、内部電極が露出する両端面に外部
電極が設けられている構造を有する。2. Description of the Related Art A multilayer capacitor has, inside a ceramic laminated body, internal electrodes that are alternately drawn out one by one on opposite end faces, and external electrodes are provided on both end faces where the internal electrodes are exposed. Have a structure.
【0003】このような積層コンデンサは、セラミック
ス粉末と有機バインダーを混練したスラリーをシート状
にしたグリーンシート上に、スクリーン印刷等の方法で
導電ペーストを塗布したものを複数枚積み重ね、加熱加
圧して積層体とし、この積層体を個別チップに分割し
て、焼成した後、外部電極焼付けを行うことにより得ら
れる。In such a multilayer capacitor, a plurality of sheets, each of which is formed by applying a conductive paste by a method such as screen printing, is stacked on a green sheet, which is a slurry formed by kneading ceramic powder and an organic binder, and is heated and pressed. It is obtained by forming a laminated body, dividing this laminated body into individual chips, firing them, and then baking external electrodes.
【0004】[0004]
【発明が解決しようとする課題】積層コンデンサには、
内部電極とセラミックシート層とが交互に積み重なって
いる積層部と、その積層部を保護する複数のセラミック
シートからなる保護層が存在する。積層コンデンサは単
位体積当りの取得容量が大きく取れるので、大容量化の
要求が高くなり、近年内部電極の積層枚数が増加するよ
うになり、それにつれて積層体における内部電極部分の
割合が多くなってきた。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
There are a laminated portion in which internal electrodes and ceramic sheet layers are alternately stacked, and a protective layer formed of a plurality of ceramic sheets that protects the laminated portion. Since a multilayer capacitor can obtain a large capacity per unit volume, the demand for larger capacity has increased, and in recent years the number of laminated internal electrodes has increased, which has led to an increase in the proportion of internal electrode parts in the laminated body. It was
【0005】セラミックシート層と内部電極の金属層と
は収縮の仕方が異なるので、積層部と保護層の収縮の差
が大きくなり、この両者の間にクラック等が発生するこ
とがあった。これを防ぐため、内部電極の厚みを薄く形
成することが行われたが、これにも問題があった。すな
わち、電極を薄く形成するために導電ペーストを薄く塗
布すると、導電ペーストの金属粒子が焼成時に凝集して
内部電極に隙間が生じてしまうことである。また、図3
の従来の積層コンデンサの部分断面図に示すように、内
部電極が薄くなると、内部電極のエッジ部分での電界の
密度が高くなってくる。積層部中央の内部電極間では、
両隣の内部電極に電界が分散され集中の程度が小さい
が、最外層の内部電極は隣接する内部電極が1本しかな
いので、電界の密度が他の部分より高く集中の程度が大
きくなる。このため、耐電圧特性が低下するという問題
も出てきた。Since the ceramic sheet layer and the metal layer of the internal electrode shrink differently, the difference in shrinkage between the laminated portion and the protective layer becomes large, and cracks or the like may occur between the two. In order to prevent this, the thickness of the internal electrode has been reduced, but this also has a problem. That is, when the conductive paste is thinly applied to form the electrode thinly, the metal particles of the conductive paste are aggregated during firing and a gap is generated in the internal electrode. Also, FIG.
As shown in the partial cross-sectional view of the conventional multilayer capacitor, the thinner the internal electrode, the higher the density of the electric field at the edge portion of the internal electrode. Between the internal electrodes in the center of the laminated part,
Although the electric field is dispersed to the adjacent inner electrodes on both sides and the degree of concentration is small, the innermost electrode in the outermost layer has only one adjacent inner electrode, so that the electric field density is higher than the other portions and the degree of concentration is large. Therefore, there has been a problem that the withstand voltage characteristic is deteriorated.
【0006】したがって本発明の目的は、内部電極端部
に発生する電界密度を低くして集中を緩和させることに
より耐電圧特性を向上させるとともに、さらには内部電
極の厚みを薄く形成したことによって内部電極が焼成時
に凝集して隙間が生じることに起因する取得容量の低下
を防止できる積層コンデンサを提供することにある。Therefore, an object of the present invention is to improve the withstand voltage characteristics by reducing the density of the electric field generated at the end portions of the internal electrodes to reduce the concentration, and further, by forming the internal electrodes thin, An object of the present invention is to provide a multilayer capacitor capable of preventing a reduction in acquisition capacity due to aggregating of electrodes during firing to form a gap.
【0007】[0007]
【課題を解決するための手段】本発明者らは上記目的を
達成すべく研究の結果、内部電極とセラミックシート層
が交互に積み重ねられた積層コンデンサにおいて、電界
の集中を緩和するために、少なくとも最外層の内部電極
の厚みを、その他の内部電極の厚みよりも厚く形成すれ
ば、耐電圧特性を向上させ得ること、さらには、厚い内
部電極と薄い内部電極とを交互に積み重ねることにより
取得容量の低下が防げることを見いだして本発明に到達
した。DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted research to achieve the above-mentioned object, and as a result, in a multilayer capacitor in which internal electrodes and ceramic sheet layers are alternately stacked, at least the concentration of an electric field is relaxed. If the thickness of the innermost electrode of the outermost layer is made thicker than the thickness of the other inner electrodes, the withstand voltage characteristics can be improved, and further, by accumulating thick and thin inner electrodes alternately, the obtained capacitance The present invention has been reached by finding that the decrease of the above can be prevented.
【0008】したがって本発明は第1に、セラミックシ
ートを挟んで交互に対向する内部電極を積み重ねて形成
されるチップ素体の両端面に、該内部電極が一層ずつ交
互に引き出されており、これら内部電極が露出する該両
端面に外部電極が形成されてなる積層コンデンサであっ
て、積層される内部電極のうち、少なくとも最外層の内
部電極の方がその他の内部電極よりも相対的に厚く形成
されていることを特徴とする積層コンデンサ;第2に、
セラミックシートを挟んで交互に対向する内部電極を積
み重ねて形成されるチップ素体の両端面に、該内部電極
が一層ずつ交互に引き出されており、これら内部電極が
露出する該両端面に外部電極が形成されてなる積層コン
デンサであって、積層される内部電極のうち、相対的に
厚い内部電極と薄い内部電極とが交互に、かつ厚い内部
電極が最外層になるように積み重ねられていることを特
徴とする積層コンデンサを提供するものである。Therefore, according to the present invention, firstly, the internal electrodes are alternately drawn out one by one on both end surfaces of a chip element body formed by stacking the internal electrodes alternately facing each other with a ceramic sheet interposed therebetween. A multilayer capacitor having external electrodes formed on both end surfaces where the internal electrodes are exposed, wherein at least the outermost internal electrode of the laminated internal electrodes is formed relatively thicker than the other internal electrodes. Secondly, a multilayer capacitor characterized in that
The internal electrodes are alternately drawn out one by one on both end surfaces of a chip element body formed by stacking internal electrodes that are alternately opposed to each other with a ceramic sheet sandwiched between them, and external electrodes are provided on both end surfaces where these internal electrodes are exposed. Of the internal electrodes to be laminated, the relatively thick internal electrodes and the thin internal electrodes are alternately stacked, and the thick internal electrodes are stacked so as to be the outermost layer. And a multilayer capacitor characterized by the above.
【0009】[0009]
【作用】積層コンデンサの内部部電極の一部の厚みを必
要に応じて変更することによって、前記収縮の問題、取
得容量の問題または電界集中の問題を解決することがで
きる。すなわち、図4の部分断面図に示すように、最外
層のセラミックシート1に印刷された内部電極の厚みを
他のものよりも厚く形成することによって(厚い内部電
極3と薄い内部電極4)、内部電極端部に発生する電界
の密度を低くして集中を緩和することができ、耐電圧特
性を向上させることができる。By changing the thickness of a part of the internal electrodes of the multilayer capacitor as required, the problems of contraction, acquisition capacitance or electric field concentration can be solved. That is, as shown in the partial cross-sectional view of FIG. 4, by forming the thickness of the internal electrodes printed on the outermost ceramic sheet 1 to be thicker than the others (thick internal electrodes 3 and thin internal electrodes 4), The density of the electric field generated at the ends of the internal electrodes can be reduced to reduce the concentration, and the withstand voltage characteristics can be improved.
【0010】さらに、厚い内部電極と薄い内部電極を交
互に積み重ねることにより、一方の内部電極が隙間の多
いものであっても他方の厚い電極が隙間の少ない電極と
なるので、取得容量の低下を少なくすることができる。Further, by alternately stacking the thick internal electrodes and the thin internal electrodes, even if one internal electrode has a large gap, the other thick electrode becomes an electrode having a small gap, so that the acquisition capacity is reduced. Can be reduced.
【0011】[0011]
【実施例1】図1は本実施例で作成された積層コンデン
サの内部構造を示す模式縦断面図であって、この図を参
照して以下説明する。[Embodiment 1] FIG. 1 is a schematic vertical sectional view showing an internal structure of a multilayer capacitor prepared in this embodiment, which will be described below with reference to this drawing.
【0012】セラミック粉末を有機バインダー、溶媒、
分散剤等と混練してセラミックスラリーを作成する。こ
のセラミックスラリーをPETフィルム等の支持体上に
塗布してセラミックシートを作成する。このセラミック
シートに、スクリーン印刷法(スクリーンの乳剤厚8μ
m)により導電ペースト(粘度300PS)を塗布し、
薄い内部電極4となる内部電極パターンを形成する。こ
のとき一部のセラミックシートには乳剤の厚い(10μ
m)スクリーンを用いて印刷し、厚い内部電極3が印刷
されたセラミックシート1を用意する。The ceramic powder is mixed with an organic binder, a solvent,
A ceramic slurry is prepared by kneading with a dispersant or the like. This ceramic slurry is applied onto a support such as a PET film to prepare a ceramic sheet. Screen printing method (screen emulsion thickness 8μ
m) apply the conductive paste (viscosity 300PS),
An internal electrode pattern to be the thin internal electrode 4 is formed. At this time, some ceramic sheets have a thick emulsion (10 μm).
m) Print using a screen to prepare the ceramic sheet 1 on which the thick internal electrodes 3 are printed.
【0013】次に内部電極パターンを形成したセラミッ
クシートを、一定形状に打ち抜いてこれを積み重ねる
が、このとき先に用意した厚い内部電極3が印刷された
シートが前記積層部の最外層およびその近傍の層になる
ようにして積み重ねる。次いでこのシートを重ねたもの
に保護層となるセラミックシートを重ね、金型に入れて
加熱加圧し積層体を得る。この積層体を所定寸法の個別
チップに切断分割した後、チップを焼成炉で焼結し、そ
の内部電極露出面に導電ペーストを焼き付けて外部電極
2を形成し、積層コンデンサを得る。Next, the ceramic sheets on which the internal electrode patterns are formed are punched into a certain shape and stacked, and at this time, the sheet on which the thick internal electrodes 3 prepared above are printed is the outermost layer of the laminated portion and its vicinity. Stack so that it becomes a layer of. Then, a ceramic sheet to be a protective layer is stacked on the stacked sheets, placed in a mold and heated and pressed to obtain a laminate. This laminated body is cut and divided into individual chips having a predetermined size, the chips are sintered in a firing furnace, and a conductive paste is baked on the exposed surface of the internal electrodes to form the external electrodes 2, thereby obtaining a laminated capacitor.
【0014】[0014]
【実施例2】図2は本実施例で作成された積層コンデン
サの内部構造を示す模式縦断面図であって、この図を参
照して以下説明する。[Embodiment 2] FIG. 2 is a schematic longitudinal sectional view showing the internal structure of the multilayer capacitor produced in this embodiment, which will be described below with reference to this drawing.
【0015】実施例1と同様にしてセラミックシートを
作成し、スクリーン印刷法(スクリーン乳剤厚8μm)
により導電ペースト(粘度300PS)を塗布し、厚い
内部電極3となる内部電極パターンを形成する。このと
き一部のセラミックシートには乳剤厚の薄い(5μm)
スクリーンを用いて印刷し、薄い内部電極4が印刷され
たセラミックシート1を用意する。A ceramic sheet was prepared in the same manner as in Example 1 and screen-printed (screen emulsion thickness 8 μm).
Then, a conductive paste (viscosity 300 PS) is applied to form an internal electrode pattern to be a thick internal electrode 3. At this time, some of the ceramic sheets have a thin emulsion thickness (5 μm).
A ceramic sheet 1 having a thin internal electrode 4 printed thereon is prepared by printing using a screen.
【0016】次に内部電極パターンを形成したセラミッ
クシートを、一定形状に打ち抜いてこれを積み重ねる
が、このとき先に用意した薄い内部電極4が印刷された
シートと通常の印刷シートとが交互になるようにして積
み重ねる(この場合、上記薄い内部電極のシートに対し
て厚い内部電極3が印刷されたシートが最外層になるよ
うに積み重ねる)。この後、実施例1と同様にして積層
コンデンサを得る。Next, the ceramic sheets on which the internal electrode patterns are formed are punched into a certain shape and stacked, and at this time, the sheets on which the thin internal electrodes 4 prepared previously are printed and the normal printed sheets alternate. In this way, stacking is performed (in this case, the sheet on which the thick internal electrodes 3 are printed is stacked as the outermost layer on the sheet of the thin internal electrodes). After that, a multilayer capacitor is obtained in the same manner as in Example 1.
【0017】[0017]
【比較例】実施例1と同様にしてセラミックシートを作
成し、スクリーン印刷法(スクリーンの乳剤厚8μm)
により導電ペースト(粘度300PS)を塗布し、内部
電極パターンを形成する。得られた印刷シートを積み重
ね、その後実施例2と同様にして積層コンデンサを得
る。Comparative Example A ceramic sheet was prepared in the same manner as in Example 1 and screen-printed (screen emulsion thickness 8 μm).
Conductive paste (viscosity 300 PS) is applied to form internal electrode patterns. The printed sheets obtained are stacked, and then a multilayer capacitor is obtained in the same manner as in Example 2.
【0018】実施例1および2と比較例との絶縁不良を
比較するために、それぞれの完成品200個を、80℃
−100V、湿度95%の負荷をかけて12時間後、絶
縁不溶の有無を調べた結果、絶縁不良発生数は、実施例
1で0/200、実施例2で0/200、比較例で3/
200であり、比較例の絶縁不良の原因を調べたとこ
ろ、3つとも最外層の内部電極とその隣の電極との短絡
であった。In order to compare the insulation failure between Examples 1 and 2 and the comparative example, 200 finished products were each subjected to 80 ° C.
After applying a load of −100 V and a humidity of 95% for 12 hours, the presence or absence of insulation insoluble was examined. As a result, the number of occurrences of insulation failure was 0/200 in Example 1, 0/200 in Example 2, and 3 in Comparative Example. /
It was 200, and when the cause of the insulation failure in the comparative example was examined, it was found that all three had a short circuit between the innermost outer electrode and the electrode next to it.
【0019】また、実施例2と比較例において、それぞ
れ完成品50個の静電容量の測定を行い、その平均値を
出して容量値を比較したところ比較例を100%とした
ときの実施例2の容量値は97.6%であった。In Example 2 and Comparative Example, the capacitance of 50 finished products was measured, and the average value was calculated to compare the capacitance values. The capacity value of 2 was 97.6%.
【0020】[0020]
【発明の効果】以上説明したように、本発明によれば、
電界の集中による耐電圧特性の低下の防止、さらには薄
く形成した内部電極が焼成時に凝集して隙間が生じるこ
とにより起こる取得容量の低下を防止することができ
る。As described above, according to the present invention,
It is possible to prevent a decrease in withstand voltage characteristics due to the concentration of an electric field, and further to prevent a decrease in acquisition capacity that is caused by a thin internal electrode aggregating during firing to form a gap.
【図1】本発明の一実施例で作成された積層コンデンサ
の内部構造を示す模式縦断面図である。FIG. 1 is a schematic vertical cross-sectional view showing the internal structure of a multilayer capacitor produced according to an example of the present invention.
【図2】本発明の別の実施態様で作成された積層コンデ
ンサの内部構造を示す模式縦断面図である。FIG. 2 is a schematic vertical cross-sectional view showing the internal structure of a multilayer capacitor manufactured according to another embodiment of the present invention.
【図3】従来の積層コンデンサにおいて、最外層の内部
電極では他の部分よりも内部電極端部に発生する電界密
度が集中しやすいことを示す部分断面図である。FIG. 3 is a partial cross-sectional view showing that in the conventional multilayer capacitor, the electric field density generated at the inner electrode end portion is more likely to be concentrated in the innermost electrode of the outermost layer than in other portions.
【図4】本発明の積層コンデンサにおいて、最外層の内
部電極の厚みを他のものよりも厚くして内部電極端部に
発生する電界密度の集中を緩和させた部分断面図であ
る。FIG. 4 is a partial cross-sectional view of the multilayer capacitor of the present invention in which the thickness of the innermost electrode of the outermost layer is made thicker than the others to reduce the concentration of the electric field density generated at the end of the inner electrode.
1 セラミックシート 2 外部電極 3 厚い内部電極 4 薄い内部電極 1 Ceramic Sheet 2 External Electrode 3 Thick Internal Electrode 4 Thin Internal Electrode
Claims (2)
る内部電極を積み重ねて形成されるチップ素体の両端面
に、該内部電極が一層ずつ交互に引き出されており、こ
れら内部電極が露出する該両端面に外部電極が形成され
てなる積層コンデンサであって、積層される内部電極の
うち、少なくとも最外層の内部電極の方がその他の内部
電極よりも相対的に厚く形成されていることを特徴とす
る積層コンデンサ。1. The internal electrodes are alternately drawn out one by one on both end faces of a chip body formed by stacking internal electrodes that are alternately opposed to each other with a ceramic sheet interposed therebetween, and the internal electrodes are exposed. A multilayer capacitor having external electrodes formed on both end faces, wherein at least the inner electrode of the outermost layer among the laminated inner electrodes is formed relatively thicker than the other inner electrodes. And multilayer capacitors.
る内部電極を積み重ねて形成されるチップ素体の両端面
に、該内部電極が一層ずつ交互に引き出されており、こ
れら内部電極が露出する該両端面に外部電極が形成され
てなる積層コンデンサであって、積層される内部電極の
うち、相対的に厚い内部電極と薄い内部電極とが交互
に、かつ厚い内部電極が最外層になるように積み重ねら
れていることを特徴とする積層コンデンサ。2. The internal electrodes are alternately drawn out one by one on both end faces of a chip body formed by stacking internal electrodes that are alternately opposed to each other with a ceramic sheet interposed therebetween, and the internal electrodes are exposed. A multilayer capacitor having external electrodes formed on both end surfaces, wherein among relatively stacked internal electrodes, relatively thick internal electrodes and thin internal electrodes are alternately arranged, and a thick internal electrode is an outermost layer. A multilayer capacitor characterized by being stacked.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7124398A JPH08298228A (en) | 1995-04-25 | 1995-04-25 | Laminated capacitor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7124398A JPH08298228A (en) | 1995-04-25 | 1995-04-25 | Laminated capacitor |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08298228A true JPH08298228A (en) | 1996-11-12 |
Family
ID=14884457
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7124398A Pending JPH08298228A (en) | 1995-04-25 | 1995-04-25 | Laminated capacitor |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08298228A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019176120A (en) * | 2018-03-29 | 2019-10-10 | サムソン エレクトロ−メカニックス カンパニーリミテッド. | Multilayer capacitor |
WO2020153265A1 (en) * | 2019-01-25 | 2020-07-30 | 京セラ株式会社 | Capacitor |
-
1995
- 1995-04-25 JP JP7124398A patent/JPH08298228A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019176120A (en) * | 2018-03-29 | 2019-10-10 | サムソン エレクトロ−メカニックス カンパニーリミテッド. | Multilayer capacitor |
WO2020153265A1 (en) * | 2019-01-25 | 2020-07-30 | 京セラ株式会社 | Capacitor |
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