JPH10223473A - Composite ceramic capacitor - Google Patents

Composite ceramic capacitor

Info

Publication number
JPH10223473A
JPH10223473A JP2265597A JP2265597A JPH10223473A JP H10223473 A JPH10223473 A JP H10223473A JP 2265597 A JP2265597 A JP 2265597A JP 2265597 A JP2265597 A JP 2265597A JP H10223473 A JPH10223473 A JP H10223473A
Authority
JP
Japan
Prior art keywords
chip
ceramic capacitor
multilayer ceramic
type multilayer
dummy
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
Application number
JP2265597A
Other languages
Japanese (ja)
Inventor
Hisanori Akiyama
久典 秋山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Materials Corp
Original Assignee
Mitsubishi Materials Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Materials Corp filed Critical Mitsubishi Materials Corp
Priority to JP2265597A priority Critical patent/JPH10223473A/en
Publication of JPH10223473A publication Critical patent/JPH10223473A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To prevent degradation of characteristics and breakdown by a method wherein a dummy chip is a ceramic chip which is not provided with an internal electrode and its coefficient of thermal expansion is nearly identical to that of a ceramic for a chip-shaped multilayer ceramic capacitor. SOLUTION: In a composite ceramic capacitor, dummy chips 5 are bonded respectively, by an adhesive 2, to both ends in the lamination direction of chip- shaped multilayer ceramic capacitors 1, and a metal plate or a metal cap 3 is bonded, by solder or a thermosetting conductive synthetic resin 4, to a bonded body which comprises five chip-shaped multilayer ceramic capacitors 1 and of two dummy chips 5. Then, the dummy chips 5 are not provided with an internal electrode, and they are constituted of ceramic chips whose coefficient of thermal expansion is nearly identical to that of a ceramic for the chip-shaped multilayer ceramic capacitors 1. The width and the length of the dummy chips 5 are made nearly identical to those of the chip-shaped multilayer ceramic capacitors 1, and the thickness of the dummy chips is set at about 0.8 to 1.0 times the thickness of the chip-shaped multilayer ceramic capacitors.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は複合セラミックコン
デンサに係り、特に、複数個のチップ型積層セラミック
コンデンサを重ね合わせた積層セラミックコンデンサに
関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite ceramic capacitor, and more particularly to a multilayer ceramic capacitor in which a plurality of chip-type multilayer ceramic capacitors are stacked.

【0002】[0002]

【従来の技術】従来、内部電極及び外部電極を有するチ
ップ型積層セラミックコンデンサを、複数個、接着剤を
介して積層し、各チップ型積層セラミックコンデンサの
外部電極同士を導通させた複合セラミックコンデンサが
提供されている。
2. Description of the Related Art Conventionally, a composite ceramic capacitor in which a plurality of chip-type multilayer ceramic capacitors having an internal electrode and an external electrode are laminated via an adhesive, and the external electrodes of each chip-type multilayer ceramic capacitor are electrically connected to each other is known. Provided.

【0003】図2は、このような従来の複合セラミック
コンデンサを示す断面図である。この複合セラミックコ
ンデンサは、チップ型積層セラミックコンデンサ1を5
個重ね合せ、各チップ型積層セラミックコンデンサ1,
1間を接着剤2で接合一体化し、この接合体に金属板又
は金属キャップ3をはんだ又は熱硬化型導電性合成樹脂
4で接合することにより、各チップ型積層セラミックコ
ンデンサ1の外部電極1Aを導通したものである。なお
1Bは、各チップ型積層セラミックコンデンサ1のセラ
ミック素体を示し、内部には内部電極(図示せず)が形
成されている。
FIG. 2 is a sectional view showing such a conventional composite ceramic capacitor. This composite ceramic capacitor has a chip-type multilayer ceramic capacitor 1 of 5
Each chip type multilayer ceramic capacitor 1,
1 are bonded and integrated with an adhesive 2 and a metal plate or a metal cap 3 is bonded to the bonded body with a solder or a thermosetting conductive synthetic resin 4 to form an external electrode 1A of each chip-type multilayer ceramic capacitor 1. It is conductive. 1B indicates a ceramic body of each chip-type multilayer ceramic capacitor 1, in which internal electrodes (not shown) are formed.

【0004】[0004]

【発明が解決しようとする課題】このような複合セラミ
ックコンデンサを基板に実装した場合、チップ型積層セ
ラミックコンデンサ1が直接基板に接触することとなる
ため、環境温度の変化に伴い発生する、基板とチップ型
積層セラミックコンデンサ1の熱膨張収縮量の差に起因
する応力を、直接、チップ型積層セラミックコンデンサ
1が受け、これによりチップ型積層セラミックコンデン
サ1の特性が劣化したり、著しい場合には破壊に至る。
When such a composite ceramic capacitor is mounted on a substrate, the chip-type multilayer ceramic capacitor 1 comes into direct contact with the substrate. The stress caused by the difference in the amount of thermal expansion and contraction of the chip-type multilayer ceramic capacitor 1 is directly received by the chip-type multilayer ceramic capacitor 1, thereby deteriorating the characteristics of the chip-type multilayer ceramic capacitor 1 or destructing the chip-type multilayer ceramic capacitor 1 in a remarkable case. Leads to.

【0005】また、実装時の外力により、チップ型積層
セラミックコンデンサ1にクラックが発生し特性が劣化
する場合もあった。
In some cases, cracks may occur in the chip-type multilayer ceramic capacitor 1 due to external force during mounting, and the characteristics may deteriorate.

【0006】本発明は上記従来の複合セラミックコンデ
ンサの、実装基板とチップ型積層セラミックコンデンサ
の熱膨張収縮量の差に起因する応力による特性の劣化や
破壊を防止した複合セラミックコンデンサを提供するこ
とを目的とする。
An object of the present invention is to provide a composite ceramic capacitor in which deterioration and destruction of characteristics of the conventional composite ceramic capacitor due to stress caused by a difference in thermal expansion and contraction amount between a mounting substrate and a chip-type multilayer ceramic capacitor are prevented. Aim.

【0007】本発明はまた、複合セラミックコンデンサ
の実装時の外力によるクラックの発生を防止した複合セ
ラミックコンデンサを提供することを目的とする。
Another object of the present invention is to provide a composite ceramic capacitor in which cracks due to external force during mounting of the composite ceramic capacitor are prevented.

【0008】[0008]

【課題を解決するための手段】本発明の複合セラミック
コンデンサは、内部電極及び外部電極を有するチップ型
積層セラミックコンデンサが、複数個、接着剤を介して
積層され、各チップ型積層セラミックコンデンサの外部
電極同士が導通されてなる複合セラミックコンデンサに
おいて、該積層方向の最も外側に配置されたチップ型積
層セラミックコンデンサのうち少なくとも一方のチップ
型積層セラミックコンデンサに対し、該積層方向の外側
面にダミーチップを接着した複合セラミックコンデンサ
であって、該ダミーチップは、内部電極を有しないセラ
ミックチップであり、かつ、前記チップ型積層セラミッ
クコンデンサのセラミックと略同一の熱膨張係数を有す
ることを特徴とする。
According to the composite ceramic capacitor of the present invention, a plurality of chip-type multilayer ceramic capacitors each having an internal electrode and an external electrode are laminated via an adhesive. In the composite ceramic capacitor in which the electrodes are conducted, at least one of the chip-type multilayer ceramic capacitors disposed on the outermost side in the laminating direction, a dummy chip is provided on the outer surface in the laminating direction. The bonded composite ceramic capacitor is characterized in that the dummy chip is a ceramic chip having no internal electrode and has substantially the same coefficient of thermal expansion as the ceramic of the chip-type multilayer ceramic capacitor.

【0009】なお、このセラミックの熱膨張係数とダミ
ーチップの熱膨張係数の差は、セラミックの熱膨張係数
の±5%以内とくに±3%以内が好ましい。
The difference between the coefficient of thermal expansion of the ceramic and the coefficient of thermal expansion of the dummy chip is preferably within ± 5%, more preferably within ± 3% of the coefficient of thermal expansion of the ceramic.

【0010】本発明の複合セラミックコンデンサでは、
チップ型積層セラミックコンデンサと実装基板との間に
介在するダミーチップが、基板とチップ型積層セラミッ
クコンデンサとの熱膨張収縮量の差に起因する応力がチ
ップ型積層セラミックコンデンサに直接及ぶことを防止
する緩衝材として機能する。
In the composite ceramic capacitor of the present invention,
A dummy chip interposed between the chip-type multilayer ceramic capacitor and the mounting substrate prevents stress caused by a difference in the amount of thermal expansion and contraction between the substrate and the chip-type multilayer ceramic capacitor from directly affecting the chip-type multilayer ceramic capacitor. Functions as a cushioning material.

【0011】特に、ダミーチップをチップ型積層セラミ
ックコンデンサの積層方向の両端に設けた場合には、チ
ップ型積層セラミックコンデンサがダミーチップにより
保護され、実装時の外力によりチップ型積層セラミック
コンデンサにクラックが発生するのを防止することがで
きる。
In particular, when dummy chips are provided at both ends in the stacking direction of the chip-type multilayer ceramic capacitor, the chip-type multilayer ceramic capacitor is protected by the dummy chip, and cracks are generated in the chip-type multilayer ceramic capacitor by external force during mounting. This can be prevented from occurring.

【0012】[0012]

【発明の実施の形態】以下に図面を参照して本発明の実
施の形態を詳細に説明する。
Embodiments of the present invention will be described below in detail with reference to the drawings.

【0013】図1は本発明の複合セラミックコンデンサ
の実施の形態を示す断面図である。図1において図2に
示す部材と同一機能を奏する部材には同一符号を付して
ある。
FIG. 1 is a sectional view showing an embodiment of the composite ceramic capacitor of the present invention. In FIG. 1, members having the same functions as the members shown in FIG. 2 are denoted by the same reference numerals.

【0014】図1に示す複合セラミックコンデンサは、
チップ型積層セラミックコンデンサ1の積層方向の両端
にそれぞれダミーチップ5が接着剤2で接着されてお
り、5個のチップ型積層セラミックコンデンサ1と2個
のダミーチップ5の接合体に金属板又は金属キャップ3
がはんだ又は熱硬化型導電性合成樹脂4で接合されてい
る点が図2に示す従来の複合セラミックコンデンサと異
なり、その他は同様の構成とされている。
The composite ceramic capacitor shown in FIG.
Dummy chips 5 are bonded to both ends of the chip-type multilayer ceramic capacitor 1 in the laminating direction with an adhesive 2, and a bonded body of the five chip-type multilayer ceramic capacitors 1 and the two dummy chips 5 is attached to a metal plate or metal. Cap 3
Are different from the conventional composite ceramic capacitor shown in FIG. 2 in that they are joined by solder or thermosetting conductive synthetic resin 4, and the other components have the same configuration.

【0015】ダミーチップ5は、内部電極がなく、チッ
プ型積層セラミックコンデンサ1のセラミックと略同一
の熱膨張係数を有するセラミックチップよりなるもので
あり、一般的には、チップ型積層セラミックコンデンサ
1のセラミック素体1Bを構成するセラミックと同一組
成のものが用いられる。
The dummy chip 5 has no internal electrodes and is made of a ceramic chip having substantially the same coefficient of thermal expansion as the ceramic of the chip-type multilayer ceramic capacitor 1. A ceramic element having the same composition as the ceramic constituting the ceramic body 1B is used.

【0016】このダミーチップ5の幅や長さについては
チップ型積層セラミックコンデンサ1と略同一寸法とす
るのが、ダミーチップ5の製造に当り、従来の製造設備
を適用して容易に製造できることから好ましい。
The width and length of the dummy chip 5 are set to be substantially the same as those of the chip-type multilayer ceramic capacitor 1 because the dummy chip 5 can be easily manufactured by applying conventional manufacturing equipment when manufacturing the dummy chip 5. preferable.

【0017】ダミーチップ5の厚さは、薄過ぎるとダミ
ーチップ5による改善効果が十分に得られず、厚過ぎる
と複合セラミックコンデンサ寸法が徒に大きくなり好ま
しくない。一般に、ダミーチップ5の厚さはチップ型積
層セラミックコンデンサ1の厚さに対して0.8〜1.
0倍程度であることが好ましい。
If the thickness of the dummy chip 5 is too small, the effect of improvement by the dummy chip 5 cannot be sufficiently obtained. If the thickness is too large, the dimensions of the composite ceramic capacitor become undesirably large. Generally, the thickness of the dummy chip 5 is 0.8 to 1.
It is preferably about 0 times.

【0018】このような複合セラミックコンデンサは、
チップ型積層セラミックコンデンサ1の積層に当り、ダ
ミーチップ5を積層方向の両端に積層して接着すること
以外は従来の複合セラミックコンデンサと同様に製造す
ることができる。
Such a composite ceramic capacitor is
When the chip-type multilayer ceramic capacitor 1 is laminated, it can be manufactured in the same manner as the conventional composite ceramic capacitor except that the dummy chips 5 are laminated and bonded to both ends in the laminating direction.

【0019】なお、図1に示す複合セラミックコンデン
サは、ダミーチップ5をチップ型積層セラミックコンデ
ンサ1の積層方向の両端に設けたものであるが、ダミー
チップはその一端側にのみ設けたものであっても良い。
この場合であっても、複合セラミックコンデンサを、ダ
ミーチップを設けた側が基板側となるように実装するこ
とで、基板とチップ型積層セラミックコンデンサとの熱
膨張収縮量の差に起因する応力がチップ型積層セラミッ
クコンデンサに直接及ぶことを防止することができる。
In the composite ceramic capacitor shown in FIG. 1, the dummy chips 5 are provided at both ends in the stacking direction of the chip-type multilayer ceramic capacitor 1, but the dummy chips are provided only at one end thereof. May be.
Even in this case, by mounting the composite ceramic capacitor such that the side on which the dummy chip is provided is on the substrate side, the stress caused by the difference in the amount of thermal expansion and contraction between the substrate and the chip-type multilayer ceramic capacitor can be reduced. It can be prevented from directly affecting the multilayer ceramic capacitor.

【0020】[0020]

【実施例】以下に実施例及び比較例を挙げて本発明をよ
り具体的に説明する。
The present invention will be described more specifically below with reference to examples and comparative examples.

【0021】実施例1 下記チップ型積層セラミックコンデンサ5個と下記ダミ
ーチップ2個とを接着して図1に示す複合セラミックコ
ンデンサを作製した。
Example 1 Five composite ceramic capacitors shown in FIG. 1 were manufactured by bonding five chip-type multilayer ceramic capacitors described below and two dummy chips described below.

【0022】チップ型積層セラミックコンデンサ Z5U特性,定格電圧25v,容量4.7μF 寸法=5.7mm×5.0mm×1.25mm厚さダミーチップ チップ型積層セラミックコンデンサのセラミックと同一
組成のセラミックチップ 寸法=5.7mm×5.0mm×1.25mm厚さ なお、チップ型積層セラミックコンデンサ同士及びチッ
プ型積層セラミックコンデンサとダミーチップの接着に
は東芝シリコーン(株)製のXE13を用い、外部電極
導通には松代工業(株)製のはんだめっき銅板を用い、
この金属板と外部電極との接合には千住金属工業(株)
製の#295はんだを用いた。
Characteristics of chip-type multilayer ceramic capacitor Z5U, rated voltage 25v, capacitance 4.7 μF Dimension = 5.7 mm × 5.0 mm × 1.25 mm thickness Ceramic chip of the same composition as the ceramic of the dummy chip-type multilayer ceramic capacitor = 5.7 mm × 5.0 mm × 1.25 mm thickness In addition, XE13 manufactured by Toshiba Silicone Co., Ltd. was used to bond the chip-type multilayer ceramic capacitors and between the chip-type multilayer ceramic capacitors and the dummy chip, and to conduct external electrodes. Is a solder plated copper plate manufactured by Matsushiro Industry Co., Ltd.
Senju Metal Industries Co., Ltd.
# 295 solder was used.

【0023】得られた複合セラミックコンデンサについ
て、下記方法により温度サイクル試験を行い、結果を表
1に示した。
The obtained composite ceramic capacitor was subjected to a temperature cycle test according to the following method, and the results are shown in Table 1.

【0024】温度サイクル試験 試験基板(厚さ1.0mmのアルミニウム基板)に共晶
はんだを厚さ0.25mmのメタルマスクで印刷し、3
0個のサンプルを230℃リフローはんだ付けにて搭載
し、−55℃(30分)〜室温(3分)〜+125℃
(30分)〜室温(3分)〜−55℃(30分)を1サ
イクルとして昇温、降温を繰り返す。
Temperature cycle test A eutectic solder was printed on a test substrate (aluminum substrate having a thickness of 1.0 mm) with a metal mask having a thickness of 0.25 mm, and
0 samples are mounted by reflow soldering at 230 ° C, -55 ° C (30 minutes)-room temperature (3 minutes)-+ 125 ° C
(30 minutes) to room temperature (3 minutes) to -55 ° C (30 minutes) as one cycle, and the temperature increase and decrease are repeated.

【0025】比較例1 実施例1においてダミーチップを用いなかったこと以外
は同様にして複合セラミックコンデンサを製造し、同様
に温度サイクル試験を行って結果を表1に示した。
Comparative Example 1 A composite ceramic capacitor was manufactured in the same manner as in Example 1 except that no dummy chip was used, and a temperature cycle test was similarly performed. The results are shown in Table 1.

【0026】[0026]

【表1】 [Table 1]

【0027】[0027]

【発明の効果】以上詳述した通り、本発明の複合セラミ
ックコンデンサによれば、耐温度サイクル特性が良好
で、耐久性、信頼性に優れた複合セラミックコンデンサ
が提供される。
As described above in detail, according to the composite ceramic capacitor of the present invention, a composite ceramic capacitor having good temperature cycle resistance, excellent durability and reliability is provided.

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

【図1】本発明の複合セラミックコンデンサの実施の形
態を示す断面図である。
FIG. 1 is a sectional view showing an embodiment of a composite ceramic capacitor according to the present invention.

【図2】従来の複合セラミックコンデンサを示す断面図
である。
FIG. 2 is a sectional view showing a conventional composite ceramic capacitor.

【符号の説明】[Explanation of symbols]

1 チップ型積層セラミックコンデンサ 1A 外部電極 1B セラミック素体 2 接着剤 3 金属板又は金属キャップ 4 はんだ又は熱硬化型導電性合成樹脂 5 ダミーチップ DESCRIPTION OF SYMBOLS 1 Chip-type multilayer ceramic capacitor 1A External electrode 1B Ceramic body 2 Adhesive 3 Metal plate or metal cap 4 Solder or thermosetting conductive synthetic resin 5 Dummy chip

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 内部電極及び外部電極を有するチップ型
積層セラミックコンデンサが、複数個、接着剤を介して
積層され、各チップ型積層セラミックコンデンサの外部
電極同士が導通されてなる複合セラミックコンデンサに
おいて、 該積層方向の最も外側に配置されたチップ型積層セラミ
ックコンデンサのうち少なくとも一方のチップ型積層セ
ラミックコンデンサに対し、該積層方向の外側面にダミ
ーチップを接着した複合セラミックコンデンサであっ
て、 該ダミーチップは、内部電極を有しないセラミックチッ
プであり、かつ、前記チップ型積層セラミックコンデン
サのセラミックと略同一の熱膨張係数を有することを特
徴とする複合セラミックコンデンサ。
1. A composite ceramic capacitor in which a plurality of chip-type multilayer ceramic capacitors having internal electrodes and external electrodes are laminated via an adhesive, and the external electrodes of each chip-type multilayer ceramic capacitor are electrically connected to each other. A composite ceramic capacitor in which a dummy chip is bonded to an outer surface in the laminating direction with respect to at least one of the chip-type multilayer ceramic capacitors disposed on the outermost side in the laminating direction. Is a ceramic chip having no internal electrode, and has substantially the same thermal expansion coefficient as the ceramic of the chip-type multilayer ceramic capacitor.
JP2265597A 1997-02-05 1997-02-05 Composite ceramic capacitor Pending JPH10223473A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2265597A JPH10223473A (en) 1997-02-05 1997-02-05 Composite ceramic capacitor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2265597A JPH10223473A (en) 1997-02-05 1997-02-05 Composite ceramic capacitor

Publications (1)

Publication Number Publication Date
JPH10223473A true JPH10223473A (en) 1998-08-21

Family

ID=12088864

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2265597A Pending JPH10223473A (en) 1997-02-05 1997-02-05 Composite ceramic capacitor

Country Status (1)

Country Link
JP (1) JPH10223473A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6583981B2 (en) 2000-11-29 2003-06-24 Murata Manufacturing Co., Ltd. Ceramic condenser module
KR101031111B1 (en) * 2008-11-04 2011-04-25 조인셋 주식회사 Complex Ceramic Chip Component capable for surface-mounting
JP2014027085A (en) * 2012-07-26 2014-02-06 Tdk Corp Electronic component

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6583981B2 (en) 2000-11-29 2003-06-24 Murata Manufacturing Co., Ltd. Ceramic condenser module
KR101031111B1 (en) * 2008-11-04 2011-04-25 조인셋 주식회사 Complex Ceramic Chip Component capable for surface-mounting
JP2014027085A (en) * 2012-07-26 2014-02-06 Tdk Corp Electronic component

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