JP2000082606A - Chip-type thermistor and its manufacture - Google Patents

Chip-type thermistor and its manufacture

Info

Publication number
JP2000082606A
JP2000082606A JP10251203A JP25120398A JP2000082606A JP 2000082606 A JP2000082606 A JP 2000082606A JP 10251203 A JP10251203 A JP 10251203A JP 25120398 A JP25120398 A JP 25120398A JP 2000082606 A JP2000082606 A JP 2000082606A
Authority
JP
Japan
Prior art keywords
thermistor
chip
forming
electrodes
insulating coating
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
JP10251203A
Other languages
Japanese (ja)
Inventor
Yoshihiro Higuchi
由浩 樋口
Koji Yotsumoto
孝二 四元
Yasutaka Maeda
保隆 前田
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 JP10251203A priority Critical patent/JP2000082606A/en
Publication of JP2000082606A publication Critical patent/JP2000082606A/en
Pending legal-status Critical Current

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  • Thermistors And Varistors (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
  • Structures For Mounting Electric Components On Printed Circuit Boards (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a highly precise, highly strong, and highly reliable chip-type thermistor having inner electrodes and surface electrodes and wide thermistor characteristics (the combination of a resistance value with a B constant). SOLUTION: Insulating protecting layers 4 are formed on the four side faces of a thermistor element 1 in which inner electrodes 2A and 2B and surface electrodes 3A-3D are formed, and external electrodes 5A and 5B are formed on the both end faces in this chip-type thermistor 10A. Thermistor green sheets on which conductive layers for forming inner electrodes are formed are laminated and sintered, and a conductive layer for forming surface electrodes and an insulating coated layer are formed on the upper and lower main plate faces of the sintered body, and this is cut like a prism. Then, insulating coating layers are formed on the two non-coated side faces of the prismatic thermistor element, and this is cut in a direction orthogonally crossing a longitudinal direction so that a chip can be obtained, and external electrodes are formed on the both edge faces of this chip. Thus, this chip-type thermistor can be manufactured.

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、プリント基板等に
表面実装されるチップ型サーミスタ及びその製造方法に
係り、特に、温度の上昇により抵抗値が減少する負特性
サーミスタであって、サーミスタ特性の範囲が広く、高
精度で信頼性の高いチップ型サーミスタ及びこのような
チップ型サーミスタを良好な加工性のもとに製造する方
法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip thermistor surface-mounted on a printed circuit board or the like and a method for manufacturing the same, and more particularly to a negative thermistor whose resistance value decreases with an increase in temperature. The present invention relates to a chip thermistor having a wide range, high accuracy and high reliability, and a method of manufacturing such a chip thermistor with good workability.

【0002】[0002]

【従来の技術】プリント回路基板等に表面実装されるチ
ップ型サーミスタの代表的な製品は、図4に示す如く、
チップ状サーミスタ素体41の両端面に外部電極42と
して、はんだ耐熱性、はんだ付着性を向上させるために
導電性金属層42Aよりなる端子電極とその表面を被覆
するNiめっき層42B及びはんだめっき層42Cを形
成し、この外部電極形成端面以外の4側面をガラス層4
3で被覆した構造のチップ型サーミスタ40である。ま
た、チップ型サーミスタの電気特性、例えば、抵抗値と
B定数の組み合せを拡大するために、抵抗値調整用の表
面電極をチップ状サーミスタ素体41の対向する2側面
に形成し、その上にガラス層を形成するようにしたもの
や、チップ状サーミスタ素体41の内部に内部電極を形
成したものもある。
2. Description of the Related Art A typical product of a chip thermistor surface-mounted on a printed circuit board or the like is shown in FIG.
External electrodes 42 are provided on both end surfaces of the chip-shaped thermistor element 41 as terminal electrodes made of a conductive metal layer 42A for improving solder heat resistance and solder adhesion, and a Ni plating layer 42B and a solder plating layer covering the surface thereof. 42C, and the four side surfaces other than the external electrode forming end surfaces are
3 is a chip-type thermistor 40 having a structure covered with the same. Further, in order to expand the electrical characteristics of the chip-type thermistor, for example, the combination of the resistance value and the B constant, surface electrodes for adjusting the resistance value are formed on two opposing side surfaces of the chip-like thermistor element body 41, and are formed thereon. There is a type in which a glass layer is formed, and a type in which an internal electrode is formed inside the chip-shaped thermistor body 41.

【0003】従来、このようなチップ型サーミスタは次
のようにして製造されている。
Conventionally, such a chip-type thermistor has been manufactured as follows.

【0004】 サーミスタブロックを成形、焼成した
後、チップ形状に切断し、このチップ状サーミスタ素体
の4側面をガラス層で被覆し、その両端面に外部電極を
形成する。即ち、導電性ペーストを塗布して焼成するこ
とにより、導電性金属層を焼き付け、更に、Niめっき
層及びはんだめっき層を形成する。
After the thermistor block is molded and fired, it is cut into a chip shape, four side surfaces of the chip-like thermistor body are covered with glass layers, and external electrodes are formed on both end surfaces. That is, by applying and baking a conductive paste, the conductive metal layer is baked, and further, a Ni plating layer and a solder plating layer are formed.

【0005】表面電極を形成する場合には、チップ形状
に切断する前に、表面電極形成用の導電層をサーミスタ
焼結板の主板面に形成する。
When forming a surface electrode, a conductive layer for forming a surface electrode is formed on the main plate surface of the thermistor sintered plate before cutting into a chip shape.

【0006】 必要に応じて、内部電極形成用の導電
層や表面電極形成用の導電層を形成したサーミスタグリ
ーンシートを用いて、複数枚のサーミスタグリーンシー
トを積層し、ガラス層を形成した後、チップ形状に切断
し、上記と同様にして外部電極を形成する。
If necessary, a plurality of thermistor green sheets are laminated using a thermistor green sheet on which a conductive layer for forming internal electrodes and a conductive layer for forming surface electrodes are formed, and a glass layer is formed. It is cut into a chip shape and external electrodes are formed in the same manner as described above.

【0007】[0007]

【発明が解決しようとする課題】上記の方法では、表
面電極を有するチップ型サーミスタを製造することがで
きるが、内部電極を有するチップ型サーミスタを製造す
ることはできない。表面電極のみでは、抵抗値を低減す
る効果に限界があり、得られるサーミスタ特性(抵抗値
とB定数の組み合わせ)の範囲が比較的狭く、一般に得
ることが困難な低抵抗、B定数の特性のサーミスタを実
現する上では問題がある。
According to the above method, a chip thermistor having surface electrodes can be manufactured, but a chip thermistor having internal electrodes cannot be manufactured. With only the surface electrode, the effect of reducing the resistance value is limited, and the range of the thermistor characteristics (combination of the resistance value and the B constant) obtained is relatively narrow. There is a problem in realizing a thermistor.

【0008】の方法では、内部電極と表面電極とを有
するチップ型サーミスタを製造することはできるが、焼
成前のグリーンの段階でチップ形状に切断するために、
焼成時の収縮ばらつき等の影響を受け、十分な寸法精度
が得られず、結果として、製品の特性として十分な抵抗
値精度を達成できないという問題があった。また、内部
電極を有するため、抵抗値を減少する効果には優れてい
るが、グリーンの段階で電極を形成するため、製品特性
としては、上記と同様十分な抵抗値精度が得られないと
いう問題があった。
In the above method, a chip thermistor having an internal electrode and a surface electrode can be manufactured. However, in order to cut the chip into a chip at a green stage before firing,
Due to the effects of shrinkage variation during firing, sufficient dimensional accuracy cannot be obtained, and as a result, there has been a problem that sufficient resistance value accuracy cannot be achieved as a product characteristic. In addition, the internal electrode has an excellent effect of reducing the resistance value. However, since the electrode is formed at the green stage, sufficient resistance value accuracy cannot be obtained as described above as a product characteristic. was there.

【0009】本発明は上記従来の問題点を解決し、内部
電極及び表面電極を有し、幅広いサーミスタ特性(抵抗
値とB定数の組み合わせ)を有するチップ型サーミスタ
であって、高精度かつ高強度で信頼性の高いチップ型サ
ーミスタ及びその製造方法を提供することを目的とす
る。
The present invention solves the above-mentioned conventional problems, and is a chip type thermistor having an internal electrode and a surface electrode and having a wide range of thermistor characteristics (combination of resistance value and B constant). And a highly reliable chip type thermistor and a method for manufacturing the same.

【0010】[0010]

【課題を解決するための手段】本発明のチップ型サーミ
スタは、内部に内部電極が形成され、側面に表面電極が
形成されたサーミスタ素体と、該サーミスタ素体の4側
面に形成された絶縁性の保護層と、該サーミスタ素体の
両端面に形成された外部電極とを備えてなることを特徴
とする。
The chip type thermistor of the present invention has a thermistor element having an internal electrode formed therein and a surface electrode formed on a side face thereof, and an insulating element formed on four side faces of the thermistor element body. And an external electrode formed on both end surfaces of the thermistor body.

【0011】本発明のチップ型サーミスタの製造方法
は、少なくとも一部のサーミスタグリーンシートに内部
電極形成用導電層が形成された複数のサーミスタグリー
ンシートを積層した後焼成して薄板状のサーミスタ焼結
体を製造する工程と、該サーミスタ焼結体の上下の主板
面に表面電極形成用の導電層を形成する工程と、該導電
層が形成されたサーミスタ焼結体の上下の主板面に絶縁
性の被覆層を形成する工程と、該絶縁性の被覆層が形成
されたサーミスタ焼結体を短冊状に切断して角柱状のサ
ーミスタ素体を得る工程と、該角柱状のサーミスタ素体
の絶縁性の被覆層が形成されていない2側面に絶縁性の
被覆層を形成する工程と、4側面に絶縁性の被覆層が形
成された角柱状のサーミスタ素体を長手方向に直交する
方向に切断してチップ状のサーミスタ素体を得る工程
と、該チップ状のサーミスタ素体の絶縁性の被覆層の形
成されていない両端面の外部電極を形成する工程とを有
することを特徴とする。
The method of manufacturing a chip-type thermistor according to the present invention is characterized in that a plurality of thermistor green sheets each having a conductive layer for forming an internal electrode formed thereon are laminated on at least a part of the thermistor green sheets and then fired to form a thin plate thermistor. Manufacturing a body, forming a conductive layer for forming a surface electrode on the upper and lower main plate surfaces of the thermistor sintered body, and insulating the upper and lower main plate surfaces of the thermistor sintered body on which the conductive layer is formed. Forming a coating layer of the above, and cutting the sintered body of thermistor on which the insulating coating layer is formed into a rectangular shape to obtain a prism-shaped thermistor body; and insulating the prism-shaped thermistor body. Forming an insulating coating layer on two side surfaces on which no insulating coating layer is formed, and cutting a prism-shaped thermistor body having an insulating coating layer on four side surfaces in a direction orthogonal to the longitudinal direction Then click Obtaining a Jo thermistor element, characterized in that a step of forming external electrodes on both ends surfaces not formed with the insulating covering layer of the chip-like thermistor body.

【0012】本発明のチップ型サーミスタは、内部電極
及び表面電極を有するため低抵抗化が可能で、幅広いサ
ーミスタ特性を実現することができる。
The chip type thermistor of the present invention has an internal electrode and a surface electrode, so that the resistance can be reduced and a wide range of thermistor characteristics can be realized.

【0013】しかも、表面電極を有するため高強度で、
実装後の温度サイクル性能にも優れる。また、絶縁性の
保護層を有するため、耐候性、強度等の信頼性も高い。
In addition, since it has a surface electrode, it has high strength,
Excellent in temperature cycle performance after mounting. In addition, since it has an insulating protective layer, reliability such as weather resistance and strength is high.

【0014】また、サーミスタグリーンシートの積層体
を切断せずにウェハ状のまま焼成し、表面電極形成後切
断する本発明のチップ型サーミスタによれば、 ウェハを切断加工するので、先行試験を行って、抵
抗値の微調整が可能。
According to the chip-type thermistor of the present invention, in which the laminated body of thermistor green sheets is baked in the form of a wafer without being cut and cut after forming the surface electrode, the wafer is cut and processed, so that a preliminary test is performed. And fine adjustment of the resistance value is possible.

【0015】 表面電極により、抵抗値調整ができる
上に素子強度も向上される。
The surface electrode not only allows the resistance value to be adjusted, but also improves the element strength.

【0016】 焼成後切断するため、切断寸法による
抵抗値の微調整が可能でサーミスタ特性の精度も高いも
のとなる。
Since the cutting is performed after firing, the resistance value can be finely adjusted according to the cutting dimension, and the accuracy of the thermistor characteristics is also high.

【0017】といった作用効果が奏される。The operation and effect described above are achieved.

【0018】[0018]

【発明の実施の形態】以下に図面を参照して本発明のチ
ップ型サーミスタ及びその製造方法を詳細に説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A chip type thermistor and a method for manufacturing the same according to the present invention will be described below in detail with reference to the drawings.

【0019】図1,2は本発明のチップ型サーミスタの
実施の形態を示す断面図であり、各々、(a)図はチッ
プ型サーミスタの長手方向の断面図、(b)図は(a)
図のB−B線に沿う断面図、(c)図は(a)図のC−
C線に沿う断面図、(d)図は(a)図のD−D線に沿
う断面図、(e)図は(a)図のE−E線に沿う断面図
である。なお、図1,2において、同一機能を奏する部
材には同一符号を付してある。
FIGS. 1 and 2 are cross-sectional views showing an embodiment of a chip thermistor according to the present invention. FIG. 1 (a) is a longitudinal sectional view of the chip thermistor, and FIG.
A cross-sectional view taken along the line BB of the drawing, FIG.
FIG. 3D is a cross-sectional view along the line DD in FIG. 3A, and FIG. 3E is a cross-sectional view along the line EE in FIG. In FIGS. 1 and 2, members having the same function are denoted by the same reference numerals.

【0020】図1に示すチップ型サーミスタ10Aは、
セラミックス焼結体よりなる直方体形状のチップ状サー
ミスタ素体1と、このサーミスタ素体1の内部に設けら
れた内部電極2A,2Bと、サーミスタ素体1の一対の
対向側面に形成された表面電極3A,3B,3C,3D
と、サーミスタ素体1の4側面に形成されたガラス層4
と、サーミスタ素体1の両端面に形成された外部電極5
A,5Bとを備える。内部電極2Aは外部電極5Aに、
内部電極2Bは外部電極5Aにそれぞれ導通するように
設けられている。また、表面電極3A,3Cは外部電極
5Aに、表面電極3B,3Dは外部電極5Bにそれぞれ
導通するように設けられている。
The chip type thermistor 10A shown in FIG.
A rectangular parallelepiped chip-shaped thermistor element 1 made of a ceramic sintered body, internal electrodes 2A and 2B provided inside the thermistor element 1, and surface electrodes formed on a pair of opposed side surfaces of the thermistor element 1 3A, 3B, 3C, 3D
And glass layers 4 formed on four side surfaces of the thermistor body 1
And external electrodes 5 formed on both end surfaces of the thermistor body 1.
A, 5B. The internal electrode 2A is connected to the external electrode 5A,
The internal electrodes 2B are provided so as to be electrically connected to the external electrodes 5A. The surface electrodes 3A and 3C are provided so as to be electrically connected to the external electrode 5A, and the surface electrodes 3B and 3D are provided so as to be electrically connected to the external electrode 5B.

【0021】図2に示すチップ型サーミスタ1Bは、内
部電極として、外部電極5Aに導通する内部電極2a,
2dと、外部電極5Bに導通する内部電極2b,2e
と、これらの中間の位置において外部電極5A,5Bに
導通しない内部電極2Cとが設けられている点が図1に
示すチップ型サーミスタ1Aと異なり、その他は同様の
構成とされている。
The chip type thermistor 1B shown in FIG. 2 has, as internal electrodes, internal electrodes 2a, which are electrically connected to an external electrode 5A.
2d and the internal electrodes 2b and 2e which are electrically connected to the external electrode 5B.
And an internal electrode 2C that is not electrically connected to the external electrodes 5A and 5B at an intermediate position between them, and is different from the chip-type thermistor 1A shown in FIG.

【0022】次に、図3を参照して、このような本発明
のチップ型サーミスタを製造する方法を説明する。
Next, a method of manufacturing such a chip type thermistor of the present invention will be described with reference to FIG.

【0023】図3(a)〜(g)は本発明のチップ型サ
ーミスタの製造方法の実施の形態を説明する斜視図であ
る。キャスティング法によりサーミスタ材料のセラミッ
クスグリーンシート11,12,13を作製し、その所
定位置に内部電極となる導電層14を印刷する。この導
電層14は、Ag,Ag/Pd等の導電性金属粉末を含
む導電性ペーストを印刷することにより形成することが
できる。図示の例では、セラミックスグリーンシート1
1〜13のうち、シート11及びシート12の一方の面
に導電層14を形成した。そして、このシート11〜1
3を積層し(図1(a))、加圧した後、脱脂、焼成し
て薄板状の焼結体15を得る。(図1(b))。
FIGS. 3A to 3G are perspective views illustrating an embodiment of a method for manufacturing a chip thermistor according to the present invention. Ceramic green sheets 11, 12, and 13 of thermistor material are prepared by a casting method, and a conductive layer 14 serving as an internal electrode is printed at a predetermined position. The conductive layer 14 can be formed by printing a conductive paste containing a conductive metal powder such as Ag or Ag / Pd. In the illustrated example, the ceramic green sheet 1
Of the sheets 1 to 13, the conductive layer 14 was formed on one surface of the sheet 11 and the sheet 12. And this sheet 11-1
3 are laminated (FIG. 1A), pressurized, degreased and fired to obtain a thin plate-shaped sintered body 15. (FIG. 1 (b)).

【0024】次いで、この焼結体15の表裏の主板面に
表面電極となる導電層16を形成する(図1(c))。
この導電層16は上記内部電極用の導電層14と同様に
して形成することができる。この導電層16の形成に際
しては、必要に応じて、焼結体15の両主板面を研磨加
工することにより、厚みの調整を行うことができる。
Next, a conductive layer 16 to be a surface electrode is formed on the front and back main plate surfaces of the sintered body 15 (FIG. 1 (c)).
The conductive layer 16 can be formed in the same manner as the conductive layer 14 for the internal electrode. When forming the conductive layer 16, the thickness can be adjusted by polishing both main plate surfaces of the sintered body 15 as necessary.

【0025】表面電極用導電層16を形成した後は、焼
結体15の表裏の主板面にガラスペーストを印刷、乾
燥、焼成することにより、ガラス層17を形成し(図1
(d))、その後、この焼結体15を導電層14,16
の延在する方向と直支する方向(図1(d)の一点鎖線
1)で切断して角柱状のサーミスタ素体18を得(図
1(e))、次いでこの角柱状のサーミスタ素体18の
ガラス層未被覆の2側面18A,18Bにガラス層17
を形成する。このようにして4側面にガラス層17を形
成した角柱状のサーミスタ素体18をその長手方向と直
支する方向(図1(f)の一点鎖線L2)に切断してチ
ップ状のサーミスタ素体19を得る(図1(g))。
After forming the surface electrode conductive layer 16, a glass paste is printed, dried and fired on the front and back main plate surfaces of the sintered body 15 to form a glass layer 17 (FIG. 1).
(D)) Then, the sintered body 15 is divided into the conductive layers 14 and 16.
Is cut in a direction directly supporting the extending direction of the prism (dot-dash line L 1 in FIG. 1D) to obtain a prism-shaped thermistor element 18 (FIG. 1E), and then this prism-shaped thermistor element The glass layer 17 is provided on the two sides 18A and 18B of the body 18 which are not covered with the glass layer.
To form The prism-shaped thermistor element 18 having the glass layers 17 formed on the four side surfaces in this manner is cut in a direction directly supporting the longitudinal direction (a dashed line L 2 in FIG. 1 (f)) to form a chip-shaped thermistor element. A body 19 is obtained (FIG. 1 (g)).

【0026】このチップ状のサーミスタ素体19の両端
面19A,19Bに常法に従って外部電極を形成するこ
とにより、図1に示すようなチップ型サーミスタ10A
を得ることができる。
By forming external electrodes on both end surfaces 19A and 19B of the chip-like thermistor element 19 according to a conventional method, a chip-type thermistor 10A as shown in FIG.
Can be obtained.

【0027】なお、保護被覆層としてのガラス層17は
10〜30mm程度の厚さに形成するのが好ましい。こ
の被覆層は、ガラス層に限らず、他の無機絶縁材料層で
あっても良い。
It is preferable that the glass layer 17 as a protective coating layer is formed to a thickness of about 10 to 30 mm. This coating layer is not limited to a glass layer, and may be another inorganic insulating material layer.

【0028】このような本発明によれば、0.6〜2.
0mm×0.3〜1.25mm×0.3〜1.0mm厚
さといった小型のチップ型サーミスタであっても良好な
加工精度、作業性のもとに、高生産性にて製造すること
ができる。
According to the present invention, 0.6-2.
Even a small chip thermistor with a thickness of 0 mm x 0.3 to 1.25 mm x 0.3 to 1.0 mm can be manufactured with high productivity under good processing accuracy and workability. it can.

【0029】[0029]

【実施例】以下に実施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 with reference to the following examples.

【0030】実施例1 図3に示す方法に従って、図1に示すチップ型サーミス
タ10Aを製造した。
Example 1 A chip thermistor 10A shown in FIG. 1 was manufactured according to the method shown in FIG.

【0031】まず、出発原料として、市販の炭酸マンガ
ン、炭酸コバルト、酸化銅を所定の金属元素割合になる
ように秤量し、ボールミルで10時間湿式混合後、乾
燥、解砕し、900℃で10時間仮焼した。この仮焼粉
末の粒径は約1μmであった。次に、この粉砕粉に有機
溶剤及び結合材等を添加し、スリップキャスティング法
により厚さ20μmのグリーンシートを作製した。
First, as starting materials, commercially available manganese carbonate, cobalt carbonate, and copper oxide are weighed so as to have a predetermined metal element ratio, wet-mixed in a ball mill for 10 hours, dried, crushed, and dried at 900 ° C. for 10 hours. It was calcined for hours. The particle size of the calcined powder was about 1 μm. Next, an organic solvent and a binder were added to the pulverized powder, and a green sheet having a thickness of 20 μm was prepared by a slip casting method.

【0032】そして、図1に示す断面構造になるよう
に、作製したグリーンシートの積層と、内部電極用導電
層の印刷を行った。なお、内部電極材料にはAg/Pd
=30:70の導電性ペーストを用いた。
Then, the prepared green sheets were laminated and the conductive layer for internal electrodes was printed so as to obtain the cross-sectional structure shown in FIG. The internal electrode material is Ag / Pd.
= 30: 70 conductive paste was used.

【0033】この積層体を静水圧プレスし、100mm
×100mm、厚さ0.5mmのグリーンシートを得
た。この積層体を350〜500℃で脱脂した後、11
00℃で焼成して焼結体を得た。
This laminate was pressed isostatically to a thickness of 100 mm.
A green sheet having a size of 100 mm and a thickness of 0.5 mm was obtained. After degreasing this laminate at 350 to 500 ° C, 11
It was fired at 00 ° C. to obtain a sintered body.

【0034】この焼結体の両面を研磨加工し、スクリー
ン印刷法により、上記内部電極用導電性材料と同一の材
料を用いて表面電極用導電層を作製した。
Both surfaces of this sintered body were polished, and a conductive layer for a surface electrode was formed by screen printing using the same material as the conductive material for an internal electrode.

【0035】次に、スクリーン印刷法により、焼結体の
両面にガラスペースト(ガラス材料:SiO2+PbO
+B23系)を印刷して850℃で焼成することにより
ガラス層を形成した。
Next, a glass paste (glass material: SiO 2 + PbO) was applied on both sides of the sintered body by screen printing.
+ B 2 O 3 ) and baked at 850 ° C. to form a glass layer.

【0036】その後、短冊状に切断し、得られた角柱状
サーミスタ素体の2側面に上記と同様にしてガラス層を
形成し、更にチップ状に切断してチップ状サーミスタ素
体を得た。なお、ガラス層は20μm厚さに形成した。
Thereafter, the resultant was cut into strips, glass layers were formed on the two side surfaces of the obtained prismatic thermistor body in the same manner as described above, and further cut into chips to obtain a chip thermistor body. The glass layer was formed to a thickness of 20 μm.

【0037】得られたチップ型サーミスタについて25
℃での抵抗値R25及びR25とR50から算出したB
定数とそのばらつきを調べ、従来品の値と共に、結果を
表1に示した。表1より、本発明品は従来品と比較して
ばらつきが無く、著しく良好な特性を示すものであるこ
とがわかる。
About the obtained chip type thermistor, 25
B calculated from resistance R25 at R ° C and R25 and R50
The constants and their variations were examined, and the results are shown in Table 1 together with the values of the conventional product. From Table 1, it can be seen that the product of the present invention has no variation as compared with the conventional product and exhibits remarkably good characteristics.

【0038】[0038]

【表1】 [Table 1]

【0039】[0039]

【発明の効果】以上詳述した通り、本発明のチップ型サ
ーミスタ及びその製造方法は、内部電極及び表面電極を
有し、幅広いサーミスタ特性(抵抗値とB定数の組み合
わせ)を有するチップ型サーミスタであって、高精度か
つ高強度で信頼性の高いチップ型サーミスタが提供され
る。
As described above in detail, the chip thermistor of the present invention and the method for manufacturing the same are provided with a chip thermistor having an internal electrode and a surface electrode and having a wide range of thermistor characteristics (combination of resistance value and B constant). Thus, a highly accurate, high-strength, and highly reliable chip thermistor is provided.

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

【図1】図1(a)は本発明のチップ型サーミスタの実
施の形態を示す断面図であり、図1(b)は図1(a)
のB−B線に沿う断面図、図1(c)は図1(a)のC
−C線に沿う断面図、図1(d)は図1(a)のD−D
線に沿う断面図、図1(e)は図1(a)のE−E線に
沿う断面図である。
FIG. 1A is a sectional view showing an embodiment of a chip thermistor of the present invention, and FIG. 1B is a sectional view of FIG.
1 (c) is a sectional view taken along line BB of FIG.
1D is a cross-sectional view taken along the line C, and FIG.
1 (e) is a cross-sectional view taken along line EE of FIG. 1 (a).

【図2】図2(a)は本発明のチップ型サーミスタの別
の実施の形態を示す断面図であり、図2(b)は図2
(a)のB−B線に沿う断面図、図2(c)は図2
(a)のC−C線に沿う断面図、図2(d)は図2
(a)のD−D線に沿う断面図、図2(e)は図2
(a)のE−E線に沿う断面図である。
FIG. 2A is a sectional view showing another embodiment of the chip type thermistor of the present invention, and FIG.
FIG. 2A is a sectional view taken along the line BB, and FIG.
2A is a cross-sectional view taken along the line CC, and FIG.
FIG. 2A is a cross-sectional view taken along the line DD, and FIG.
It is sectional drawing which follows the EE line of (a).

【図3】本発明のチップ型サーミスタの製造方法の実施
の形態を説明する斜視図である。
FIG. 3 is a perspective view illustrating an embodiment of a method for manufacturing a chip thermistor of the present invention.

【図4】従来のチップ型サーミスタを示す断面図であ
る。
FIG. 4 is a sectional view showing a conventional chip thermistor.

【符号の説明】[Explanation of symbols]

1 サーミスタ素体 2A,2B,2a,2b,2c,2d,2e 内部電極 3A,3B,3C,3D 表面電極 4 ガラス層 5A,5B 外部電極 10A,10B チップ型サーミスタ 11,12,13 サーミスタグリーンシート 14 導電層 15 焼結体 18 角柱状のサーミスタ素体 19 チップ状のサーミスタ素体 DESCRIPTION OF SYMBOLS 1 Thermistor body 2A, 2B, 2a, 2b, 2c, 2d, 2e Internal electrode 3A, 3B, 3C, 3D Surface electrode 4 Glass layer 5A, 5B External electrode 10A, 10B Chip-type thermistor 11, 12, 13 Thermistor green sheet Reference Signs List 14 conductive layer 15 sintered body 18 prismatic thermistor element 19 chip-shaped thermistor element

───────────────────────────────────────────────────── フロントページの続き (72)発明者 前田 保隆 埼玉県秩父郡横瀬町大字横瀬2270番地 三 菱マテリアル株式会社電子技術研究所内 Fターム(参考) 5E032 BA23 BB10 CA02 CC06 CC14 CC16 5E034 BB01 DA07 DB04 DC01 DC03 DE07 DE17 5E336 AA04 CC32 CC38 CC42 CC60 EE03 GG11  ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yasutaka Maeda 2270 Yokoze, Yokoze-cho, Chichibu-gun, Saitama F-term in the Electronic Technology Laboratory, Mitsubishi Materials Corporation 5E032 BA23 BB10 CA02 CC06 CC14 CC16 5E034 BB01 DA07 DB04 DC01 DC03 DE07 DE17 5E336 AA04 CC32 CC38 CC42 CC60 EE03 GG11

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 内部に内部電極が形成され、側面に表面
電極が形成されたサーミスタ素体と、該サーミスタ素体
の4側面に形成された絶縁性の保護層と、該サーミスタ
素体の両端面に形成された外部電極とを備えてなること
を特徴とするチップ型サーミスタ。
1. A thermistor element having an internal electrode formed therein and a surface electrode formed on a side surface, an insulating protective layer formed on four side surfaces of the thermistor element, and both ends of the thermistor element A chip-type thermistor comprising: an external electrode formed on a surface.
【請求項2】 少なくとも一部のサーミスタグリーンシ
ートに内部電極形成用導電層が形成された複数のサーミ
スタグリーンシートを積層した後焼成して薄板状のサー
ミスタ焼結体を製造する工程と、 該サーミスタ焼結体の上下の主板面に表面電極形成用の
導電層を形成する工程と、 該導電層が形成されたサーミスタ焼結体の上下の主板面
に絶縁性の被覆層を形成する工程と、 該絶縁性の被覆層が形成されたサーミスタ焼結体を短冊
状に切断して角柱状のサーミスタ素体を得る工程と、 該角柱状のサーミスタ素体の絶縁性の被覆層が形成され
ていない2側面に絶縁性の被覆層を形成する工程と、 4側面に絶縁性の被覆層が形成された角柱状のサーミス
タ素体を長手方向に直交する方向に切断してチップ状の
サーミスタ素体を得る工程と、 該チップ状のサーミスタ素体の絶縁性の被覆層の形成さ
れていない両端面に外部電極を形成する工程とを有する
ことを特徴とするチップ型サーミスタの製造方法。
2. a step of laminating a plurality of thermistor green sheets each having a conductive layer for forming an internal electrode formed on at least a part of the thermistor green sheets and firing the laminated sheets to produce a thin plate-shaped thermistor sintered body; Forming a conductive layer for forming a surface electrode on the upper and lower main plate surfaces of the sintered body; forming an insulating coating layer on the upper and lower main plate surfaces of the thermistor sintered body having the conductive layer formed thereon; Cutting the sintered body of the thermistor on which the insulating coating layer is formed into a rectangular shape to obtain a prismatic thermistor body; and forming no insulating coating layer of the prismatic thermistor body. Forming an insulating coating layer on two side surfaces; cutting a prism-shaped thermistor element body having an insulating coating layer on four side surfaces in a direction perpendicular to the longitudinal direction to form a chip-shaped thermistor element; Obtaining, Forming external electrodes on both end faces of the chip-shaped thermistor element body where the insulating coating layer is not formed.
JP10251203A 1998-09-04 1998-09-04 Chip-type thermistor and its manufacture Pending JP2000082606A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10251203A JP2000082606A (en) 1998-09-04 1998-09-04 Chip-type thermistor and its manufacture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10251203A JP2000082606A (en) 1998-09-04 1998-09-04 Chip-type thermistor and its manufacture

Publications (1)

Publication Number Publication Date
JP2000082606A true JP2000082606A (en) 2000-03-21

Family

ID=17219235

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10251203A Pending JP2000082606A (en) 1998-09-04 1998-09-04 Chip-type thermistor and its manufacture

Country Status (1)

Country Link
JP (1) JP2000082606A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010092896A (en) * 2008-10-03 2010-04-22 Murata Mfg Co Ltd Multilayer ceramic electronic component and method of manufacturing the same
CN109702287A (en) * 2019-01-22 2019-05-03 苏州纵贯线换热器有限公司 A kind of liquid cooling plate is brazed the Position Design structure of front upper and lower mainboard

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010092896A (en) * 2008-10-03 2010-04-22 Murata Mfg Co Ltd Multilayer ceramic electronic component and method of manufacturing the same
CN109702287A (en) * 2019-01-22 2019-05-03 苏州纵贯线换热器有限公司 A kind of liquid cooling plate is brazed the Position Design structure of front upper and lower mainboard

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