JP2000323304A - Negative temperature coefficient thermistor - Google Patents
Negative temperature coefficient thermistorInfo
- Publication number
- JP2000323304A JP2000323304A JP2000065059A JP2000065059A JP2000323304A JP 2000323304 A JP2000323304 A JP 2000323304A JP 2000065059 A JP2000065059 A JP 2000065059A JP 2000065059 A JP2000065059 A JP 2000065059A JP 2000323304 A JP2000323304 A JP 2000323304A
- Authority
- JP
- Japan
- Prior art keywords
- characteristic thermistor
- negative
- negative characteristic
- oxide
- temperature coefficient
- 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
- 239000000843 powder Substances 0.000 claims abstract description 32
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 19
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 19
- 230000007704 transition Effects 0.000 claims abstract description 19
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 15
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 14
- 229910052742 iron Inorganic materials 0.000 claims abstract description 14
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 12
- 239000004020 conductor Substances 0.000 claims description 8
- 229910052709 silver Inorganic materials 0.000 claims description 6
- 229910052763 palladium Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 229910002254 LaCoO3 Inorganic materials 0.000 abstract 2
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 238000005728 strengthening Methods 0.000 abstract 1
- 239000011572 manganese Substances 0.000 description 9
- 229910000679 solder Inorganic materials 0.000 description 8
- 239000002003 electrode paste Substances 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 1
- 229910018921 CoO 3 Inorganic materials 0.000 description 1
- 241000877463 Lanio Species 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910020836 Sn-Ag Inorganic materials 0.000 description 1
- 229910020988 Sn—Ag Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N lead(II) oxide Inorganic materials [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- 239000002923 metal particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Thermistors And Varistors (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、ＬａＣｏＯ3系
希土類遷移元素酸化物からなる突入電流抑制に適した負
特性サーミスタに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a negative temperature coefficient thermistor made of LaCoO 3 -based rare earth transition element oxide and suitable for suppressing inrush current.
【０００２】[0002]
【従来の技術】ＬａＣｏＯ3系希土類遷移元素酸化物
は、従来のマンガンスピネル系負特性サーミスタ材料に
比べ、Ｂ定数が大きく、高温時のサーミスタ素子の抵抗
値をより低減できる。したがって、電流を印加したと
き、負特性サーミスタ素子の自己発熱が抑えられ、定格
電流値を大きくすることができる。このことから、Ｌａ
ＣｏＯ3系希土類遷移元素酸化物は、突入電流抑制用負
特性サーミスタ素子の材料に適している。2. Description of the Related Art LaCoO 3 -based rare earth transition element oxides have a larger B constant than conventional manganese spinel-based negative characteristic thermistor materials and can further reduce the resistance value of the thermistor element at high temperatures. Therefore, when a current is applied, the self-heating of the negative characteristic thermistor element is suppressed, and the rated current value can be increased. From this, La
The CoO 3 -based rare earth transition element oxide is suitable for a material of a negative characteristic thermistor element for suppressing an inrush current.
【０００３】しかしながら、ＬａＣｏＯ3系希土類遷移
元素酸化物からなる負特性サーミスタ素子に外部電極を
形成する際、通常のＳｉＯ2，ＰｂＯ，Ｂｉ2Ｏ3などか
らなるガラスフリットを含むＡｇ、Ａｇ−Ｐｄなどの厚
膜電極ペーストを用いると、負特性サーミスタ素子と外
部電極との界面が非オーミックとなり、負特性サーミス
タ素子の抵抗値が不安定となる。したがって、ＬａＣｏ
Ｏ3系希土類遷移元素酸化物からなる負特性サーミスタ
素子は、ガラスフリットを含まない厚膜電極ペーストを
用いて外部電極を形成していた。However, when an external electrode is formed on a negative characteristic thermistor element made of LaCoO 3 -based rare earth transition element oxide, Ag, Ag-Pd containing glass frit made of ordinary SiO 2 , PbO, Bi 2 O 3, etc. When such a thick film electrode paste is used, the interface between the negative characteristic thermistor element and the external electrode becomes non-ohmic, and the resistance value of the negative characteristic thermistor element becomes unstable. Therefore, LaCo
The negative electrode thermistor element made of an O 3 -based rare earth transition element oxide has an external electrode formed using a thick film electrode paste containing no glass frit.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記の
ＬａＣｏＯ3系希土類遷移元素酸化物を主成分とする負
特性サーミスタは、外部電極形成にフリットレスペース
トを用いているため、通常のガラスフリットを含む厚膜
電極に比べて、負特性サーミスタ素子と外部電極との密
着強度が低い。負特性サーミスタ素子と外部電極との密
着強度を高めるためには、通常の厚膜電極のように６０
０〜８５０℃で1時間程度の焼成では足りず、９００〜
１０００℃で5時間程度焼成する必要がある。よって、
外部電極形成にかかるコストが高く、長時間を要すると
いう問題点があった。However, the negative characteristic thermistor containing the LaCoO 3 -based rare earth transition element oxide as a main component uses a fritless paste for forming an external electrode, and therefore contains a normal glass frit. The adhesion strength between the negative characteristic thermistor element and the external electrode is lower than that of the thick film electrode. In order to increase the adhesive strength between the negative characteristic thermistor element and the external electrode, it is necessary to use a 60
A firing time of about 1 hour at 0 to 850 ° C is not enough.
It is necessary to bake at 1000 ° C. for about 5 hours. Therefore,
There is a problem that the cost for forming the external electrode is high and a long time is required.
【０００５】さらに、外部電極を形成した負特性サーミ
スタを回路基板に取り付け、または外部電極を形成した
負特性サーミスタにリード線を半田付けして得られた負
特性サーミスタを１００℃以上の高温下で継続して使用
すると、Ｓｎなどの半田成分が外部電極へ拡散したり、
半田による外部電極のＡｇ喰われが発生し、電極強度が
低下し、負特性サーミスタの抵抗値が高くなるという問
題もあった。Furthermore, a negative temperature coefficient thermistor having external electrodes formed thereon is mounted on a circuit board, or a negative temperature coefficient thermistor obtained by soldering a lead wire to a negative temperature coefficient thermistor having external electrodes formed thereon is heated at a high temperature of 100 ° C. or more. If used continuously, solder components such as Sn will diffuse to external electrodes,
There was also a problem that Ag was eroded from the external electrode by solder, the electrode strength was reduced, and the resistance value of the negative characteristic thermistor was increased.
【０００６】この発明の目的は、ＬａＣｏＯ3系希土類
遷移元素酸化物からなる負特性サーミスタ素子と電極と
の密着強度を高め、かつ信頼性を向上させることができ
る負特性サーミスタを提供することである。An object of the present invention is to provide a negative characteristic thermistor which can increase the adhesion strength between a negative characteristic thermistor element made of LaCoO 3 -based rare earth transition element oxide and an electrode and improve reliability. .
【０００７】[0007]
【課題を解決するための手段】この発明の第１の負特性
サーミスタは、ＬａＣｏＯ3系希土類遷移元素酸化物か
らなる負特性サーミスタ素子の表面に、金属粉にＮｉ，
Ｃｒ，Ｍｎ，Ｆｅのうち１種以上の酸化物粉が含有され
た導電性材料からなる外部電極が形成されていることを
特徴とする。A first negative characteristic thermistor according to the present invention comprises a negative characteristic thermistor element made of LaCoO 3 -based rare earth transition element oxide, and Ni, Ni powder on a metal powder.
An external electrode made of a conductive material containing at least one oxide powder of Cr, Mn, and Fe is formed.
【０００８】この発明の第２の負特性サーミスタは、Ｌ
ａＣｏＯ3系希土類遷移元素酸化物からなる負特性サー
ミスタ素子の表面に、金属粉にＮｉ，Ｃｒ，Ｍｎ，Ｆｅ
のうち１種以上の酸化物粉が含有された導電性材料から
なる外部電極が形成されており、この外部電極に端子が
さらにはんだ付けされていることを特徴とする。[0008] The second negative characteristic thermistor of the present invention is an L thermistor.
a, Ni, Cr, Mn, Fe is added to the metal powder on the surface of the negative characteristic thermistor element composed of aCoO 3 based rare earth transition element oxide
An external electrode made of a conductive material containing at least one oxide powder is formed, and a terminal is further soldered to the external electrode.
【０００９】この発明の第３の負特性サーミスタは、Ｌ
ａＣｏＯ3系希土類遷移元素酸化物からなる負特性サー
ミスタ素子の表面に、金属粉にＮｉ，Ｃｒ，Ｍｎ，Ｆｅ
のうち１種以上の酸化物粉が含有された導電性材料から
なる外部電極が形成されており、前記負特性サーミスタ
素子が端子に弾性保持された状態でケースに収納されて
いることを特徴とする。A third thermistor with a negative characteristic according to the present invention is characterized in that L
a, Ni, Cr, Mn, Fe is added to the metal powder on the surface of the negative characteristic thermistor element composed of aCoO 3 based rare earth transition element oxide
Wherein an external electrode made of a conductive material containing at least one oxide powder is formed, and the negative characteristic thermistor element is housed in a case in a state of being elastically held by a terminal. I do.
【００１０】この発明の第４の負特性サーミスタは、Ｌ
ａＣｏＯ3系希土類遷移元素酸化物からなる負特性サー
ミスタ素子の少なくとも両端に、金属粉にＮｉ，Ｃｒ，
Ｍｎ，Ｆｅのうち１種以上の酸化物粉が含有された導電
性材料からなる外部電極が形成されてチップ形状とした
ことを特徴とする。[0010] The fourth negative characteristic thermistor according to the present invention is characterized in that L
At least at both ends of the negative characteristic thermistor element made of aCoO 3 -based rare earth transition element oxide, Ni, Cr,
An external electrode made of a conductive material containing at least one oxide powder of Mn and Fe is formed into a chip shape.
【００１１】前記第１〜第４の負特性サーミスタにおい
て、前記金属粉は、Ａｇ，Ａｇ−ＰｄまたはＡｇ−Ｐｔ
からなることが好ましい。In the first to fourth negative temperature coefficient thermistors, the metal powder is Ag, Ag-Pd or Ag-Pt.
It preferably comprises
【００１２】前記第１〜第５の負特性サーミスタにおい
て、前記金属粉に対する前記酸化物粉の含有量は、１．
０ｗｔ％以下（ただし、０ｗｔ％は含まず）であること
が好ましい。In the first to fifth negative temperature coefficient thermistors, the content of the oxide powder with respect to the metal powder is as follows.
It is preferably 0 wt% or less (however, 0 wt% is not included).
【００１３】前記第２の負特性サーミスタにおいて、前
記負特性サーミスタ素子は、外装樹脂で被覆されている
ことが望ましい。In the second negative characteristic thermistor, it is preferable that the negative characteristic thermistor element is covered with an exterior resin.
【００１４】これにより、負特性サーミスタ素子と外部
電極との密着強度を高めることができる。[0014] Thereby, the adhesion strength between the negative characteristic thermistor element and the external electrode can be increased.
【００１５】[0015]
【発明の実施の形態】この発明における一つの実施の形
態として、図１に示すリードタイプの負特性サーミスタ
１を参考に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to a lead type negative characteristic thermistor 1 shown in FIG.
【００１６】負特性サーミスタ１は、負特性サーミスタ
素子２と、負特性サーミスタ素子２の表面、この場合は
両主面に形成された外部電極３，４と、外部電極３、４
に電気的に接続するように半田５で取付けられたリード
線６、７と、外装樹脂８とからなる。The negative-characteristic thermistor 1 includes a negative-characteristic thermistor element 2, external electrodes 3 and 4 formed on the surface of the negative-characteristic thermistor element 2, in this case, both main surfaces, and external electrodes 3 and 4.
And lead wires 6 and 7 attached with solder 5 so as to be electrically connected to the package.
【００１７】負特性サーミスタ素子２は、ＬａＣｏＯ3
系希土類遷移元素酸化物を主成分とするセラミック原料
を用いて板状の成形体を形成し、焼成したものであり、
直径７mm、厚み１．５mmの円板状である。The negative characteristic thermistor element 2 is made of LaCoO 3
A plate-shaped molded body is formed by using a ceramic raw material mainly composed of a system rare earth transition element oxide, and is fired.
It is a disk with a diameter of 7 mm and a thickness of 1.5 mm.
【００１８】外部電極３、４は、Ａｇ，Ａｇ−Ｐｄまた
はＡｇ−Ｐｔなどからなる金属粒子粉中にＮｉ，Ｃｒ，
Ｍｎ，Ｆｅのうち１種以上の酸化物の粉末を０．１ｗｔ
％添加して調合し、さらに適当量の有機ビヒクルを添加
して混練し、粘度を調節した導電ペーストを、負特性サ
ーミスタ素子２の対向する両主面に塗布し、９００℃〜
９６０℃で1時間焼付けることにより形成される。The external electrodes 3 and 4 are composed of Ni, Cr, and Ag in metal particles made of Ag, Ag-Pd, Ag-Pt, or the like.
0.1 wt% of one or more oxide powders of Mn and Fe
%, And an appropriate amount of an organic vehicle is added and kneaded, and a conductive paste having adjusted viscosity is applied to both opposing main surfaces of the negative characteristic thermistor element 2, at 900 ° C.
It is formed by baking at 960 ° C. for 1 hour.
【００１９】さらに、負特性サーミスタ素子２の両主面
の電極３、４に、Ｓｎ−Ａｇ（成分比９６．５：３．
５）などの高温半田５でリード線６、７を取付け、シリ
コーン樹脂などの外装樹脂８で外装被覆を行い、負特性
サーミスタ１を得た。Further, the electrodes 3, 4 on both main surfaces of the negative characteristic thermistor element 2 are provided with Sn-Ag (component ratio 96.5: 3.
5) and the like, the leads 6 and 7 were attached with the high-temperature solder 5, and the exterior was covered with the exterior resin 8 such as a silicone resin to obtain the negative characteristic thermistor 1.
【００２０】この負特性サーミスタ１の負特性サーミス
タ素子２と外部電極３、４との密着強度と、高温下にお
ける使用時の経時的な抵抗値変化を調べた。同様に、Ｎ
ｉ，Ｃｒ，Ｍｎ，Ｆｅのいずれの酸化物粉をも含まない
Ａｇ，Ａｇ−ＰｄまたはＡｇ−Ｐｔなどからなるフリッ
トレス厚膜電極ペーストを負特性サーミスタ素子２の対
向する両主面に塗布し、９００℃〜１０００℃で５時間
焼付けて電極形成した従来例の負特性サーミスタについ
ても、密着強度と抵抗値変化を調べ、比較した。The adhesion strength between the negative-characteristic thermistor element 2 of the negative-characteristic thermistor 1 and the external electrodes 3 and 4 and the change of the resistance value with time during use at a high temperature were examined. Similarly, N
A fritless thick film electrode paste made of Ag, Ag-Pd, Ag-Pt, or the like that does not contain any oxide powder of i, Cr, Mn, and Fe is applied to both opposing main surfaces of the negative characteristic thermistor element 2. The adhesion strength and the change in resistance value were also examined and compared for the conventional negative characteristic thermistor formed by baking at 900 to 1000 ° C. for 5 hours.
【００２１】その結果、この発明の負特性サーミスタ素
子２と電極３、４との密着強度は、従来例に比べ、φ３
mmあたり１９．６Ｎから２９．４Ｎへと向上した。これ
は、外部電極３、４を焼付ける際、負特性サーミスタ素
子２に含まれるＬａＣｏＯ3系希土類遷移元素酸化物粒
子と外部電極３、４に含まれるＮｉＯ，Ｃｒ2Ｏ3，Ｍｎ
2Ｏ3，Ｆｅ2Ｏ3の粒子とが化学結合することによるもの
と考えられる。例えば、外部電極３、４に含まれる粒子
がＮｉＯの場合、負特性サーミスタ素子２と外部電極
３、４との界面にＬａＮｉＯ3が生成される。また、例
えばＮｉＯが負特性サーミスタ素子２の中に浸透、拡散
してアンカー効果による物理結合が生じることによるも
のと考えられる。As a result, the adhesive strength between the negative characteristic thermistor element 2 of the present invention and the electrodes 3 and 4 is smaller than that of the conventional example by φ3.
It improved from 19.6 N per mm to 29.4 N per mm. This is because when the external electrodes 3 and 4 are baked, the LaCoO 3 -based rare earth transition element oxide particles contained in the negative characteristic thermistor element 2 and the NiO, Cr 2 O 3 , Mn contained in the external electrodes 3 and 4 are used.
This is considered to be due to chemical bonding between 2 O 3 and Fe 2 O 3 particles. For example, when the particles contained in the external electrodes 3 and 4 are NiO, LaNiO 3 is generated at the interface between the negative characteristic thermistor element 2 and the external electrodes 3 and 4. Further, it is considered that NiO permeates and diffuses into the negative characteristic thermistor element 2 to cause physical coupling by the anchor effect.
【００２２】なお、導電ペースト中のＮｉ，Ｃｒ，Ｍ
ｎ，Ｆｅのうち１種以上の酸化物粉の含有量について
は、外部電極としての役割が果たせるように調整すれば
よく、半田濡れ性、外部電極の密着強度、負特性サーミ
スタの抵抗値への影響を考慮すれば、１．０ｗｔ％以下
が好ましい。Note that Ni, Cr, M in the conductive paste
The content of one or more oxide powders of n and Fe may be adjusted so as to serve as an external electrode. Solder wettability, adhesion strength of the external electrode, and resistance to the resistance of the negative characteristic thermistor may be adjusted. In consideration of the influence, the content is preferably 1.0 wt% or less.
【００２３】また、負特性サーミスタ１を１００℃以上
の高温下で継続して使用した場合の経時的な抵抗値変化
は、従来例に比べ、２０％から１％以下へと大幅に抑制
された。これは、外部電極３、４中のＮｉ，Ｃｒ，Ｍ
ｎ，Ｆｅの酸化物粉が、半田に含まれるＳｎの外部電極
３、４への拡散や、半田による外部電極３、４のＡｇ喰
われの発生を防止し、外部電極の密着強度を低下させな
いからである。Further, the change in the resistance value with time when the negative temperature coefficient thermistor 1 is continuously used at a high temperature of 100 ° C. or more is significantly suppressed from 20% to 1% or less as compared with the conventional example. . This is because Ni, Cr, M in the external electrodes 3 and 4
Oxide powders of n and Fe prevent the diffusion of Sn contained in the solder to the external electrodes 3 and 4 and the occurrence of Ag erosion of the external electrodes 3 and 4 due to the solder, and do not reduce the adhesion strength of the external electrodes. Because.
【００２４】なお、図２は、この発明における他の実施
の形態を示しており、負特性サーミスタ素子２は端子１
６、１７で弾性保持されており、両主面の電極３、４は
端子１６、１７と導通している。さらに、負特性サーミ
スタ素子２と給電端子１６、１７が耐熱性のケース１８
に収納されたケースタイプの負特性サーミスタ１１であ
る。FIG. 2 shows another embodiment of the present invention, in which a negative characteristic thermistor element 2 is connected to a terminal 1.
The electrodes 3, 4 on both main surfaces are electrically connected to the terminals 16, 17. Further, the negative characteristic thermistor element 2 and the power supply terminals 16 and 17 are made of a heat resistant case 18.
Is a case type negative characteristic thermistor 11 housed in the case.
【００２５】また、この発明における他の実施の形態と
して、負特性サーミスタ素子をたとえば直方体とし、こ
の直方体の少なくとも両端に外部電極を形成してチップ
形状とした負特性サーミスタとしてもよい。Further, as another embodiment of the present invention, the negative characteristic thermistor element may be a rectangular parallelepiped, for example, and external electrodes may be formed on at least both ends of the rectangular parallelepiped to form a chip-shaped negative characteristic thermistor.
【００２６】[0026]
【発明の効果】以上述べたように、この発明によれば、
金属粉にＮｉ，Ｃｒ，Ｍｎ，Ｆｅのうち１種以上の酸化
物粉を添加したものを電極とすることで、負特性サーミ
スタ素子と外部電極との密着強度が高い負特性サーミス
タを得ることができる。As described above, according to the present invention,
By using, as an electrode, a metal powder to which at least one oxide powder of Ni, Cr, Mn, and Fe is added, a negative-characteristic thermistor having high adhesion strength between the negative-characteristic thermistor element and an external electrode can be obtained. it can.
【００２７】また、高温下でも電極強度が低下せず、負
特性サーミスタの抵抗値変化を抑制できる。よって、負
特性サーミスタの信頼性が向上する。Further, the electrode strength does not decrease even at a high temperature, and a change in the resistance value of the negative characteristic thermistor can be suppressed. Therefore, the reliability of the negative characteristic thermistor is improved.
【図面の簡単な説明】[Brief description of the drawings]
【図１】この発明に係る一つの実施の形態の負特性サー
ミスタの部分切欠断面図である。FIG. 1 is a partially cutaway sectional view of a negative characteristic thermistor according to one embodiment of the present invention.
【図２】この発明に係る他の実施の形態の負特性サーミ
スタの断面図である。FIG. 2 is a sectional view of a negative temperature coefficient thermistor according to another embodiment of the present invention.
１、１１ 負特性サーミスタ ２ 負特性サーミスタ素子 ３、４、 外部電極 ５ 半田 ６、７ リード線 ８ 外装樹脂 １６、１７ 端子 １８ ケース DESCRIPTION OF SYMBOLS 1, 11 Negative characteristic thermistor 2 Negative characteristic thermistor element 3, 4, External electrode 5 Solder 6, 7 Lead wire 8 Outer resin 16, 17 Terminal 18 Case
Claims (6)
らなる負特性サーミスタ素子の表面に、金属粉にＮｉ，
Ｃｒ，Ｍｎ，Ｆｅのうち１種以上の酸化物粉が含有され
た導電性材料からなる外部電極が形成されていることを
特徴とする負特性サーミスタ。1. A on the surface of the negative temperature coefficient thermistor element consisting of LaCoO 3 rare earth transition element oxide, Ni in the metal powder,
A negative characteristic thermistor, wherein an external electrode made of a conductive material containing at least one oxide powder of Cr, Mn, and Fe is formed.
らなる負特性サーミスタ素子の表面に、金属粉にＮｉ，
Ｃｒ，Ｍｎ，Ｆｅのうち１種以上の酸化物粉が含有され
た導電性材料からなる外部電極が形成されており、この
外部電極に端子がさらにはんだ付けされていることを特
徴とする請求項１記載の負特性サーミスタ。2. The surface of a negative characteristic thermistor element made of LaCoO 3 -based rare earth transition element oxide is coated with Ni, Ni powder on a metal powder.
An external electrode made of a conductive material containing at least one oxide powder of Cr, Mn, and Fe is formed, and a terminal is further soldered to the external electrode. 2. The negative characteristic thermistor according to 1.
らなる負特性サーミスタ素子の表面に、金属粉にＮｉ，
Ｃｒ，Ｍｎ，Ｆｅのうち１種以上の酸化物粉が含有され
た導電性材料からなる外部電極が形成されており、前記
負特性サーミスタ素子が端子に弾性保持された状態でケ
ースに収納されていることを特徴とする請求項１記載の
負特性サーミスタ。 3. Ni, Ni is added to a metal powder on the surface of a negative characteristic thermistor element made of LaCoO 3 -based rare earth transition element oxide.
An external electrode made of a conductive material containing one or more oxide powders of Cr, Mn, and Fe is formed, and the negative characteristic thermistor element is housed in a case in a state where the element is elastically held by a terminal. The negative temperature coefficient thermistor according to claim 1, wherein
らなる負特性サーミスタ素子の少なくとも両端に、金属
粉にＮｉ，Ｃｒ，Ｍｎ，Ｆｅのうち１種以上の酸化物粉
が含有された導電性材料からなる外部電極が形成されて
チップ形状としたことを特徴とする請求項１記載の負特
性サーミスタ。4. A conductive material in which at least both ends of a negative characteristic thermistor element made of LaCoO 3 -based rare earth transition element oxide contain one or more oxide powders of Ni, Cr, Mn and Fe in a metal powder. 2. The negative temperature coefficient thermistor according to claim 1, wherein an external electrode made of a material is formed in a chip shape.
Ａｇ−Ｐｔからなることを特徴とする請求項１〜請求項
４のいずれかに記載の負特性サーミスタ。5. The negative characteristic thermistor according to claim 1, wherein the metal powder is made of Ag, Ag-Pd or Ag-Pt.
量が、１．０ｗｔ％以下（ただし、０ｗｔ％は含まず）
であることを特徴とする請求項１〜請求項５のいずれか
に記載の負特性サーミスタ。6. The content of the oxide powder with respect to the metal powder is 1.0% by weight or less (however, 0% by weight is not included).
The negative characteristic thermistor according to any one of claims 1 to 5, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000065059A JP2000323304A (en) | 1999-03-11 | 2000-03-09 | Negative temperature coefficient thermistor |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11-64904 | 1999-03-11 | ||
| JP6490499 | 1999-03-11 | ||
| JP2000065059A JP2000323304A (en) | 1999-03-11 | 2000-03-09 | Negative temperature coefficient thermistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000323304A true JP2000323304A (en) | 2000-11-24 |
Family
ID=26406037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000065059A Pending JP2000323304A (en) | 1999-03-11 | 2000-03-09 | Negative temperature coefficient thermistor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000323304A (en) |
-
2000
- 2000-03-09 JP JP2000065059A patent/JP2000323304A/en active Pending
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