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JP2841346B2 - Multilayer ceramic capacitor and method of manufacturing the same - Google Patents

Multilayer ceramic capacitor and method of manufacturing the same

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Publication number
JP2841346B2
JP2841346B2JP2112246AJP11224690AJP2841346B2JP 2841346 B2JP2841346 B2JP 2841346B2JP 2112246 AJP2112246 AJP 2112246AJP 11224690 AJP11224690 AJP 11224690AJP 2841346 B2JP2841346 B2JP 2841346B2
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JP
Japan
Prior art keywords
multilayer ceramic
ceramic capacitor
capacitor
laminate
internal electrodes
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.)
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JP2112246A
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Japanese (ja)
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JPH0410510A (en
Inventor
則一 大場
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Marcon Electronics Co Ltd
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Marcon Electronics Co Ltd
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Description

Translated fromJapanese

【発明の詳細な説明】 [発明の目的] (産業上の利用分野) 本発明は、ノイズ吸収性に優れた平滑用コンデンサと
しての積層セラミックコンデンサ及びその製造方法に関
する。
The present invention relates to a multilayer ceramic capacitor as a smoothing capacitor having excellent noise absorption and a method for manufacturing the same.

(従来の技術) 近年、スイッチング電源の小形化、軽量化、高効率化
のためのスイッチング周波数の高周波化が進み、この高
周波化はますます加速される傾向にある。
(Prior Art) In recent years, the switching frequency has been increased in frequency for the purpose of miniaturization, weight reduction, and higher efficiency of switching power supplies, and this higher frequency tends to be further accelerated.

積層セラミックコンデンサは、小形、無極性、高絶縁
抵抗、低損失、高信頼性であるという特長を有すること
から、この高周波化に伴って出力側の平滑コンデンサと
して、あるいはノイズ吸収用として注目され多用されて
いる。
Multilayer ceramic capacitors have the characteristics of small size, non-polarity, high insulation resistance, low loss, and high reliability. Have been.

しかして、上記積層セラミックコンデンサの一般構造
は、第11図及び第12図に示すように、表面に一辺を外周
辺まで延ばして内部電極21を設けたセラミックグリーン
シート22を用い、前記内部電極21の外周辺まで延びた一
辺が交互に反対側になるように前記セラミックグリーン
シート22を複数枚積層して焼結し、前記内部電極21が露
出した両側面に外部電極23を形成したものからなってい
る。
Thus, the general structure of the multilayer ceramic capacitor is, as shown in FIGS. 11 and 12, using a ceramic green sheet 22 having a surface extending on one side to the outer periphery and having an internal electrode 21 provided thereon. A plurality of the ceramic green sheets 22 are laminated and sintered so that one side extending to the outer periphery of the outer side is alternately opposite, and external electrodes 23 are formed on both side surfaces where the internal electrodes 21 are exposed. ing.

しかしながら、このような積層セラミックコンデンサ
は、その形状に起因して自己共振周波数を有しており、
その周波数より高い成分を有するノイズに対しては効果
がなく、ノイズ除去ができないことになる。
However, such a multilayer ceramic capacitor has a self-resonant frequency due to its shape,
There is no effect on noise having a component higher than that frequency, and noise cannot be removed.

すなわち、コンデンサは一般的にL.C.Rが直列に接続
された等価回路で表され、そのインピーダンスZの絶対
値|Z|はとなり、自己共振周波数より高い周波数に対してはω
L、すなわちインダクタンス成分Lが無視できなくな
り、高周波ノイズに対するインピーダンスが増大する。
このLの大きさを決定する要因は、コンデンサのリード
線の長さと電極端子間の長さである。この要因のリード
線長さに対しては、コンデンサの端子部からリード線を
それぞれ2本ずつ引出し、リード線部に起因するインダ
クタンス成分をキャンセルでき、また、リードレス化し
てチップ構造とすることによっても同様の効果を得るこ
とができる。
That is, a capacitor is generally represented by an equivalent circuit in which LCRs are connected in series, and the absolute value | Z | And for frequencies higher than the self-resonant frequency
L, that is, the inductance component L cannot be ignored, and the impedance to high frequency noise increases.
Factors that determine the magnitude of L are the length of the lead wire of the capacitor and the length between the electrode terminals. With respect to the lead wire length, which is a factor of this factor, two lead wires are respectively drawn out from the terminal part of the capacitor to cancel the inductance component caused by the lead wire part. Can obtain the same effect.

しかし、もう一方の要因である電極端子間の長さに起
因するインダクタンス成分は依然として残ることにな
る。
However, the inductance component due to the length between the electrode terminals, which is another factor, still remains.

しかして、このような電極端子間の長さに起因するイ
ンダクタンス成分は、高周波化になるほど無視できなく
なり、前述のようなスイッチング電源の高周波化傾向化
の中で上記構成になる積層セラミックコンデンサは、自
己共振周波数以上のノイズ吸収が難しくなることから、
その回路に用いるコンデンサとしての問題をかかえる結
果となっていた。
However, the inductance component due to the length between the electrode terminals cannot be ignored as the frequency increases, and the multilayer ceramic capacitor having the above configuration in the trend of the switching power supply to increase in frequency as described above is Because it becomes difficult to absorb noise above the self-resonant frequency,
As a result, the problem as a capacitor used in the circuit was found.

そのため従来は、L.Cフィルタを構成したり、コンデ
ンサを複数並列接続したりしてノイズ吸収性を高めてい
たが、回路基板に実装する部品点数が多くなり、機器の
小形化並びに軽量化指向に逆行し、かつ低価格化を阻害
することになり、改善が望まれていた。
Conventionally, noise absorption was improved by configuring an LC filter or connecting a plurality of capacitors in parallel.However, the number of components to be mounted on the circuit board increased, and this was counter to the trend toward smaller and lighter equipment. In addition, cost reduction is hindered, and improvement has been desired.

このような問題点を解決するものとして、例えば実開
昭49−127736号公報記載の技術がある。すなわち、方形
状の磁器誘電体板の面上に対向する2辺にわたるように
絶縁間隙を設けた電極を形成し、前記電極が交互にほぼ
直交するように磁器誘電体板を介して積層し、それぞれ
の側壁には外部電極を形成して前記電極と接続すること
を特徴とする構成からなるものである。
In order to solve such a problem, there is a technique described in Japanese Utility Model Laid-Open No. 49-127736, for example. That is, an electrode provided with an insulating gap is formed so as to extend over two opposing sides on the surface of a rectangular ceramic dielectric plate, and the electrodes are alternately stacked through the ceramic dielectric plate so as to be substantially orthogonal to each other, An external electrode is formed on each side wall and connected to the electrode.

しかしながら、このような構成からなる積層セラミッ
クコンデンサの場合は、内部電極に接続する外部電極の
形成手段は筆等による塗布、又はスクリーン印刷であ
り、一辺を形成した後乾燥させ、その後他の一辺を形成
するという作業となるので、非能率的で作業効率が悪
く、量産的でない問題点があった。
However, in the case of a multilayer ceramic capacitor having such a configuration, the means for forming the external electrode connected to the internal electrode is coating with a brush or the like, or screen printing, forming one side and then drying, and then drying the other side. Since it is an operation of forming, there is a problem that it is inefficient, work efficiency is low, and it is not mass-produced.

(発明が解決しようとする課題) 以上のように、従来一般化している積層セラミックコ
ンデンサは、自己共振周波数以上のノイズ吸収性に劣る
ため、これらのコンデンサを用いるにはL.Cフィルタを
構成したり、複数のコンデンサを並列接続化するなどの
手段を講じなければならず、それだけ機器の大型化並び
に高価格化となり、昨今の機器の小形化並びに軽量化の
要請に応える上で解決すべき問題を有する結果となって
いた。
(Problems to be Solved by the Invention) As described above, conventional multilayer ceramic capacitors are inferior in noise absorption at or above the self-resonant frequency. Therefore, an LC filter may be used to use these capacitors. It is necessary to take measures such as connecting a plurality of capacitors in parallel, which leads to an increase in the size and cost of the device, which has a problem to be solved in order to respond to the recent demand for a smaller and lighter device. The result was.

また、周波数特性を改善した実開昭49−127736号公報
記載の技術等もあるが、作業効率が悪く、量産的でない
問題点があった。
There is also a technique disclosed in Japanese Utility Model Laid-Open No. 49-127736 in which the frequency characteristics are improved, but there is a problem that the working efficiency is poor and the method is not mass-produced.

本発明は、上記の点に鑑みてなされたもので、単一素
子で、より広いノイズ吸収が可能な平滑用コンデンサと
しての積層セラミックコンデンサ及びその製造方法を提
供することを目的とするものである。
The present invention has been made in view of the above points, and has as its object to provide a multilayer ceramic capacitor as a smoothing capacitor capable of absorbing a wider noise with a single element, and a method of manufacturing the same. .

[発明の構成] (課題を解決するための手段) 本発明による積層セラミックコンデンサは、四外周辺
中対向する二外周辺まて延長し内部電極を設けたセラミ
ックグリーンシートと、前記内部電極が交互に交差する
ように前記セラミックグリーンシートを複数枚積層し焼
結一体化した積層体と、該積層体の四側面に前記内部電
極と接続して設けた外部電極とを具備した積層セラミッ
クコンデンサにおいて、前記積層体の四角に欠如部を設
けたことを特徴とするもので、このようなコンデンサの
製造方法として、積層体の四角部を除去し欠如部を設け
た後、この欠如部を除く四側面に内部電極と連続した外
部電極を形成するようにしたことを特徴とするものであ
る。
[Structure of the Invention] (Means for Solving the Problems) In a multilayer ceramic capacitor according to the present invention, a ceramic green sheet provided with internal electrodes extending to two opposing outer peripheries among four outer peripheries, and the internal electrodes are alternately arranged. A multilayer ceramic capacitor comprising: a laminated body obtained by laminating a plurality of the ceramic green sheets so as to intersect and sintering and integrating, and external electrodes provided on four sides of the laminated body by being connected to the internal electrodes. A method of manufacturing such a capacitor is characterized in that a square portion of the laminate is provided with a missing portion. As a method of manufacturing such a capacitor, after removing a square portion of the laminate and providing a missing portion, the four side surfaces excluding the missing portion are provided. And an external electrode which is continuous with the internal electrode.

(作用) 本発明になる積層セラミックコンデンサは、上記のよ
うに構成されているため、隣り合う一対の端子を入力端
子とし、もう一方の端子対を出力端子としての使用が可
能で、CとRの分布定数的な4端子フィルタ回路が形成
され、高周波成分は出力に現れにくくなり、L成分はミ
クロンオーダーの内部電極間隔、すなわち誘電体の厚み
にしか起因しないため、同一誘電体の厚みであればコン
デンサの形状が大きくなっても変わらず、容易に低イン
ダクタンス化が可能となり、自己共振周波数よりも高い
成分のノイズ吸収ができる。
(Operation) Since the multilayer ceramic capacitor according to the present invention is configured as described above, a pair of adjacent terminals can be used as an input terminal and the other terminal pair can be used as an output terminal. , A high-frequency component is less likely to appear in the output, and the L component is caused only by the internal electrode spacing on the order of microns, that is, the thickness of the dielectric. For example, even if the shape of the capacitor becomes large, it does not change, the inductance can be easily reduced, and noise of a component higher than the self-resonant frequency can be absorbed.

また、外部電極形成手段として、あらかじめ積層体側
面の外部電極形成部以外の部分、すなわち四角を除去し
て欠如部として形成した後外部電極を形成するものであ
るため、精度よく所望の外部電極を容易に、かつ作業性
よく形成することができるので、積層セラミックコンデ
ンサを安価に大量提供することができる。
Further, as the external electrode forming means, a portion other than the external electrode forming portion on the side surface of the laminated body, that is, the external electrode is formed after removing the square and forming the missing portion, so that the desired external electrode can be precisely formed. Since it can be formed easily and with good workability, a large number of multilayer ceramic capacitors can be provided at low cost.

(実施例) 以下、本発明の実施例につき説明する。第2図に示す
ように、四外周辺中、対向する二外周辺まで延長し、内
部電極1を設けたセラミックグリーンシート2を用い、
このセラミックグリーンシート2を前記内部電極1が交
互に交差するように複数枚積層し、第3図に示すように
上下それぞれにカバーシート3を積層した後、加圧焼結
し四側面にそれぞれ内部電極露出部4を有する積層体5
を形成した。
(Example) Hereinafter, an example of the present invention will be described. As shown in FIG. 2, a ceramic green sheet 2 provided with an internal electrode 1 is provided, extending to two opposing outer peripheries of the four outer peripheries.
A plurality of the ceramic green sheets 2 are laminated so that the internal electrodes 1 intersect alternately, and cover sheets 3 are laminated on each of the upper and lower sides as shown in FIG. Laminate 5 having exposed electrode portion 4
Was formed.

次に第4図に示すように、この積層体5の四角を切
断、切削又は研摩により除去して欠如部7を設け、この
欠如部7を除いた側面を順次外部電極ペーストに浸漬−
引き上げて乾燥焼き付け、前記内部電極露出部4と接続
した外部電極8,9,10,11を積層体5の四側面にそれぞれ
独立して位置するようにしたなるものである。
Next, as shown in FIG. 4, squares of the laminated body 5 are cut, cut or polished and removed to form missing portions 7, and the side surfaces excluding the missing portions 7 are sequentially immersed in the external electrode paste.
The external electrodes 8, 9, 10, and 11 connected to the internal electrode exposed portions 4 are pulled up and dried and baked so as to be located independently on the four side surfaces of the laminate 5.

以上のような構成になる積層セラミックコンデンサを
スイッチング電源回路に接続して使用する場合、第5図
に示すように隣り合う一対の外部電極8,9を入力端子と
してスイッチング電源の出力に接続することによって、
もう一方の外部電極10,11対から取り出される出力電圧
に含まれるノイズ電圧を大幅に軽減させることができ、
本発明者の実験に用いた内部電極を形成した0.05mmのセ
ラミックグリーンシートを45枚積層し、前述した手段に
よって得た静電容量10μFの積層セラミックコンデンサ
によれば、従来例に比しノイズ電圧が約1/4となって大
幅なノイズ電圧低減が確認された。
When the multilayer ceramic capacitor having the above configuration is used by connecting to a switching power supply circuit, as shown in FIG. 5, a pair of adjacent external electrodes 8, 9 must be connected to the output of the switching power supply as input terminals. By
The noise voltage included in the output voltage extracted from the other pair of external electrodes 10 and 11 can be significantly reduced,
According to the multilayer ceramic capacitor having a capacitance of 10 μF obtained by laminating 45 ceramic green sheets each having an internal electrode and having a thickness of 0.05 mm on which internal electrodes used in the experiment of the present inventors were performed, the noise voltage was lower than that of the conventional example. Was about 1/4, and a significant reduction in noise voltage was confirmed.

これは、コンデンサの等価インダクタンスが小さくな
るとともに内部でCRフィルタが形成されることによって
高周波成分に対するノイズ吸収能力が増加したことによ
るものであり、例えばスペクトラムアナライザを使用し
て測定した場合も第6図及び第7図から明らかなように
同様の結果が得られることが確認された。
This is due to the fact that the equivalent inductance of the capacitor is reduced and the CR filter is formed inside to increase the noise absorption capacity for high-frequency components. For example, even when measured using a spectrum analyzer, FIG. 7, and it was confirmed that similar results were obtained.

前記のように欠如部7を設けた後、必要部分にのみ外
部電極ペーストを塗布して外部電極8,9,10,11を形成す
るので、ペーストの使用量が少なくて済む利点がある。
Since the external electrodes 8, 9, 10, and 11 are formed by applying the external electrode paste only to the necessary portions after providing the missing portion 7 as described above, there is an advantage that the amount of the paste used can be reduced.

なお、欠如部の形状として上記実施例では角部を直線
的に角落としたものを例示して説明したたが、第8図に
示すように角部を湾曲状に除去した欠如部12の形状をは
じめ、その他適宜な形状でも構わない。
In the above embodiment, the shape of the missing portion has been described by exemplifying a shape in which the corner is straightened. However, as shown in FIG. And other suitable shapes.

さらに、内部電極形状は、上記実施例に限定されるこ
となく、要するに四外周辺中、対向する二外周辺まで延
長した部分があれば適宜な形状で構わない。
Further, the shape of the internal electrode is not limited to the above-described embodiment, but may be any shape as long as there is a portion extending to two opposing outer peripheries among the four outer peripheries.

なお、上記実施例では、リードレス形を例示して述べ
たが、外部電極それぞれにリード線を接続したもの、あ
るいは各種外装化したもの、さらにはリード線にフェラ
イドビーズを通したものなども本発明に含まれるもので
ある。
In the above embodiment, the leadless type is described as an example.However, a lead wire is connected to each of the external electrodes, or various types of exteriors are used. It is included in the present invention.

[発明の効果] 本発明によれば、インダクタンス成分が小さくなると
ともに、コンデンサの内部でCRフィルタが形成されるこ
とによって、高周波成分に対するノイズ吸収効果の優れ
た実用的価値の高い積層セラミックコンデンサ、及びこ
の積層セラミックコンデンサを作業性よく、大量に、安
価に提供できる製造方法を得ることができる。
[Effects of the Invention] According to the present invention, the inductance component is reduced, and a CR filter is formed inside the capacitor, so that the multilayer ceramic capacitor is excellent in noise absorption effect on high frequency components and has high practical value, and It is possible to obtain a manufacturing method that can provide this multilayer ceramic capacitor with good workability, in large quantities, and at low cost.

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

第1図〜第5図は本発明に係り、第1図は積層セラミッ
クコンデンサを示す平面図、第2図はセラミックグリー
ンシートの構成及びその積層状態を示す斜視図、第3図
は積層体を示す斜視図、第4図は積層体に欠如部を設け
た状態を示す斜視図、第5図は第1図に示すコンデンサ
を使用したスイッチング電源の回路図、第6図は本発明
によるコンデンサを用いたときの周波数応答曲線図、第
7図は従来の積層セラミックコンデンサを用いたときの
周波数応答曲線図、第8図は本発明の他の実施例になる
積層セラミックコンデンサを示す平面図、第9図は従来
の積層セラミックコンデンサのセラミックグリーンシー
トの積層状態を示す斜視図、第10図は従来の積層セラミ
ックコンデンサを示す斜視図である。 1……内部電極 2……セラミックグリーンシート 5……積層体 7……欠如部 8……外部電極 9……外部電極 10……外部電極 11……外部電極 12……欠如部
1 to 5 relate to the present invention, FIG. 1 is a plan view showing a laminated ceramic capacitor, FIG. 2 is a perspective view showing the structure of a ceramic green sheet and the state of lamination thereof, and FIG. FIG. 4 is a perspective view showing a state in which a missing portion is provided in the laminate, FIG. 5 is a circuit diagram of a switching power supply using the capacitor shown in FIG. 1, and FIG. FIG. 7 is a frequency response curve when a conventional multilayer ceramic capacitor is used, FIG. 8 is a plan view showing a multilayer ceramic capacitor according to another embodiment of the present invention, FIG. FIG. 9 is a perspective view showing a laminated state of ceramic green sheets of a conventional multilayer ceramic capacitor, and FIG. 10 is a perspective view showing a conventional multilayer ceramic capacitor. DESCRIPTION OF SYMBOLS 1 ... Internal electrode 2 ... Ceramic green sheet 5 ... Laminate 7 ... Missing part 8 ... External electrode 9 ... External electrode 10 ... External electrode 11 ... External electrode 12 ... Missing part

Claims (2)

Translated fromJapanese
(57)【特許請求の範囲】(57) [Claims]【請求項1】四外周辺中対向する二外周辺まて延長し内
部電極を設けたセラミックグリーンシートと、前記内部
電極が交互に交差するように前記セラミックグリーンシ
ートを複数枚積層し焼結一体化した積層体と、該積層体
の四側面に前記内部電極と接続して設けた外部電極とを
具備した積層セラミックコンデンサにおいて、前記積層
体の四角に欠如部を設けたことを特徴とする積層セラミ
ックコンデンサ。
1. A ceramic green sheet having inner electrodes extended to two outer peripheral parts facing each other in four outer peripheral parts, and a plurality of ceramic green sheets laminated so that the internal electrodes intersect alternately, and sintered and integrated. A multilayer ceramic capacitor comprising: a laminated body; and external electrodes provided on four side surfaces of the laminated body so as to be connected to the internal electrodes, wherein a lack is provided in a square of the laminated body. Ceramic capacitors.
【請求項2】セラミックグリーンシートの四外周辺中対
向する二外周辺まで延長した内部電極を形成する工程
と、前記内部電極が交互に交差するように前記セラミッ
クグリーンシートを複数枚積層し焼結一体化した積層体
を得る工程と、前記積層体の四側面に前記内部電極と接
続した外部電極を形成する工程とを順次経る積層セラミ
ックコンデンサの製造方法において、前記積層体を得る
工程の後に、積層体の四角部を切断、切削又は研摩によ
り除去して欠如部を設ける工程を挿入することを特徴と
する積層セラミックコンデンサの製造方法。
2. A step of forming internal electrodes extending to two opposing outer peripheries of four outer peripheries of a ceramic green sheet, and laminating and sintering a plurality of the ceramic green sheets so that the internal electrodes intersect alternately. In the method for manufacturing a laminated ceramic capacitor, which sequentially passes through a step of obtaining an integrated laminate and a step of forming external electrodes connected to the internal electrodes on four side surfaces of the laminate, after the step of obtaining the laminate, A method for manufacturing a multilayer ceramic capacitor, comprising: inserting a step of removing a square portion of a laminate by cutting, cutting, or polishing to provide a missing portion.
JP2112246A1990-04-271990-04-27 Multilayer ceramic capacitor and method of manufacturing the sameExpired - LifetimeJP2841346B2 (en)

Priority Applications (1)

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Application NumberPriority DateFiling DateTitle
JP2112246AJP2841346B2 (en)1990-04-271990-04-27 Multilayer ceramic capacitor and method of manufacturing the same

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JPH0410510A JPH0410510A (en)1992-01-14
JP2841346B2true JP2841346B2 (en)1998-12-24

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Publication numberPriority datePublication dateAssigneeTitle
AUPP398798A0 (en)1998-06-091998-07-02Silverbrook Research Pty LtdImage creation method and apparatus (ij43)
JPH11176693A (en)*1997-12-151999-07-02Matsushita Electric Ind Co Ltd Manufacturing method of multi-layer type multilayer ceramic capacitor
JP4151278B2 (en)*2001-04-122008-09-17株式会社デンソー Method for manufacturing ceramic laminate
CN103003010A (en)2010-05-202013-03-27贝克休斯公司Methods of forming at least a portion of earth-boring tools, and articles formed by such methods
CN107004506B (en)*2014-12-192018-12-28京瓷株式会社Multilayer capacitor and attachment structure

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* Cited by examiner, † Cited by third party
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JPS49127736U (en)*1973-03-031974-11-01
JPS55138222A (en)*1979-04-111980-10-28Tdk Electronics Co LtdMethod of manufacturing condenser assembly
JPH0236131Y2 (en)*1985-07-311990-10-02
JPS6331520U (en)*1986-08-151988-03-01

Also Published As

Publication numberPublication date
JPH0410510A (en)1992-01-14

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