JPH0121526Y2 - - Google Patents
Info
- Publication number
- JPH0121526Y2 JPH0121526Y2 JP1983013182U JP1318283U JPH0121526Y2 JP H0121526 Y2 JPH0121526 Y2 JP H0121526Y2 JP 1983013182 U JP1983013182 U JP 1983013182U JP 1318283 U JP1318283 U JP 1318283U JP H0121526 Y2 JPH0121526 Y2 JP H0121526Y2
- Authority
- JP
- Japan
- Prior art keywords
- varistor
- voltage
- zinc oxide
- nonlinear resistor
- electrode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 26
- 239000011787 zinc oxide Substances 0.000 claims description 13
- 239000011810 insulating material Substances 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000000463 material Substances 0.000 claims 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 11
- 229910052709 silver Inorganic materials 0.000 description 11
- 239000004332 silver Substances 0.000 description 11
- 238000005036 potential barrier Methods 0.000 description 7
- 238000005476 soldering Methods 0.000 description 7
- 229910000679 solder Inorganic materials 0.000 description 6
- 239000012212 insulator Substances 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000001747 exhibiting effect Effects 0.000 description 2
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Description
【考案の詳細な説明】
産業上の利用分野
本考案は各種電子機器のサージ保護に用いられ
る電圧非直線抵抗器に関するものである。[Detailed Description of the Invention] Industrial Application Field The present invention relates to a voltage nonlinear resistor used for surge protection of various electronic devices.
従来例の構成とその問題点
近年、電圧非直線抵抗器（以降バリスタと呼
ぶ）として酸化亜鉛を主成分とし、それに
Bi2O3，Co2O3等の金属酸化物を添加して混合、
成形、焼成した焼結体を用いたところのいわゆる
酸化亜鉛バリスタが生産され、実用に供されてい
る。Conventional structure and its problems In recent years, voltage nonlinear resistors (hereinafter referred to as varistors) have been developed using zinc oxide as the main component.
Mix by adding metal oxides such as Bi 2 O 3 and Co 2 O 3 ,
A so-called zinc oxide varistor using a molded and fired sintered body has been produced and put into practical use.
この種のバリスタの電圧−電流特性は一般に次
式によつて表わされる。 The voltage-current characteristics of this type of varistor are generally expressed by the following equation.
Ｉ＝（Ｖ／Ｃ）〓
ここで、Ｉは電流、Ｖは電圧、Ｃ，αは定数で
ある。そして、一般にバリスタの特性はバリスタ
電圧と電圧非直線指数αで表わされる。上記バリ
スタ電圧はバリスタが高抵抗体から低抵抗体に移
る時のしきい値電圧を表わし、通常バリスタに
1mAの電流を流した時にバリスタに発生する電
圧V1nAで規定している。また、電圧非直線指数
αは電圧−電流特性の立上りの急峻度を表わすも
のであり、αが大きい程急峻であり、バリスタと
しては望ましい。 I=(V/C) Here, I is current, V is voltage, and C and α are constants. Generally, the characteristics of a varistor are expressed by the varistor voltage and the voltage nonlinearity index α. The above varistor voltage represents the threshold voltage when the varistor moves from a high resistance object to a low resistance object, and is usually applied to a varistor.
It is specified by the voltage V 1nA generated in the varistor when a current of 1mA flows. Further, the voltage non-linearity index α represents the steepness of the rise of the voltage-current characteristic, and the larger α is, the steeper it is, which is desirable for a varistor.
酸化亜鉛バリスタのαは40〜100と極めて大き
く、電圧の安定化、サージ電圧抑制の効果が著し
く、電子機器の保護に広く使われてきている。 Zinc oxide varistors have an extremely large α of 40 to 100, and are highly effective in stabilizing voltage and suppressing surge voltage, and are widely used to protect electronic devices.
以下、図面を参照しながら上述したような従来
の酸化亜鉛バリスタについて説明する。第１図は
従来の酸化亜鉛バリスタを示しており、１は酸化
亜鉛を主成分とする平板形の電圧非直線抵抗体の
焼結体である。２ａ，２ｂは焼結体１の相対向す
る面に形成された銀電極である。３ａ，３ｂはハ
ンダ４ａ，４ｂで銀電極２ａ，２ｂとハンダ付け
されているリード線である。通常はさらに素子全
体を絶縁被覆している。 Hereinafter, a conventional zinc oxide varistor as described above will be explained with reference to the drawings. FIG. 1 shows a conventional zinc oxide varistor, in which numeral 1 is a sintered body of a flat plate-shaped voltage nonlinear resistor whose main component is zinc oxide. 2a and 2b are silver electrodes formed on opposing surfaces of the sintered body 1. Lead wires 3a and 3b are soldered to the silver electrodes 2a and 2b with solders 4a and 4b. Usually, the entire element is further covered with an insulating coating.
しかしながら、上記構成の酸化亜鉛バリスタは
銀電極形成時に測定したバリスタ電圧値とハンダ
付けした後に測定したバリスタ電圧値が２〜3V
異なつたり、ハンダ付けした後で極性がつくとい
う問題があつた。それはこの酸化亜鉛バリスタは
ｎ型半導体の酸化亜鉛が主成分であり、その焼結
体に銀電極を形成すると、銀と半導体（酸化亜
鉛）の接触によつて接触面に電位障壁が形成され
る。この電位が約２〜3Vである。ところがハン
ダ付けをするとハンダの成分である鉛とスズが銀
電極に侵入することになり、銀と半導体の接触に
よつて形成されていた電位障壁が破壊され、バリ
スタ電圧がバラついたり、極性がつくものであつ
た。そして、この電位障壁の破壊はハンダ付け時
の温度、時間によつて異なり、ハンダ付けによつ
て電位障壁が破壊されなかつたり、電位が1V程
度低下したりすることがあつた。このようなこと
から、酸化亜鉛バリスタを大量生産する上で歩留
りが悪くなるという問題点を有していた。 However, for the zinc oxide varistor with the above configuration, the varistor voltage value measured when forming the silver electrode and the varistor voltage value measured after soldering are 2 to 3V.
There was a problem that the polarity could be changed after soldering. The main component of this zinc oxide varistor is zinc oxide, which is an n-type semiconductor, and when a silver electrode is formed on the sintered body, a potential barrier is formed on the contact surface due to the contact between the silver and the semiconductor (zinc oxide). . This potential is about 2 to 3V. However, when soldering, the lead and tin components of the solder invade the silver electrode, destroying the potential barrier formed by the contact between the silver and the semiconductor, causing variations in the varistor voltage and polarity. It was a good thing. The breakdown of this potential barrier varies depending on the temperature and time during soldering, and sometimes the potential barrier is not broken or the potential drops by about 1V during soldering. For this reason, there has been a problem in that the yield is poor when mass producing zinc oxide varistors.
考案の目的
本考案は上記のような従来の欠点に鑑み、ハン
ダ付けをしてもバリスタ電圧がバラついたり、極
性がつかない電圧非直線抵抗器（バリスタ）を提
供するものである。Purpose of the Invention In view of the above-mentioned drawbacks of the conventional resistor, the present invention provides a voltage nonlinear resistor (varistor) in which the varistor voltage does not vary or the polarity does not change even when soldered.
考案の構成
この目的を達成するために本考案の電圧非直線
抵抗器（バリスタ）は、電極面の相対向する部分
（この部分でバリスタ特性が出ている）を樹脂等
の絶縁物で被覆し、この絶縁物で被覆されない両
面の電極部にリード線をそれぞれハンダ付けする
ことにより、ハンダが電極面の相対向する部分に
回り込まないようにしたものである。これによ
り、バリスタ特性を出している部分での電位障壁
の破壊はなくなり、バリスタ電圧がバラついた
り、極性がつくことはなくなることとなる。Structure of the invention In order to achieve this purpose, the voltage nonlinear resistor (varistor) of the invention covers opposing parts of the electrode surfaces (this part exhibits varistor characteristics) with an insulating material such as resin. By soldering lead wires to the electrode portions on both sides that are not covered with the insulator, the solder is prevented from going around to the opposing portions of the electrode surfaces. This eliminates breakdown of the potential barrier in the portion exhibiting varistor characteristics, and the varistor voltage does not vary or become polarized.
実施例の説明
以下、本考案の一実施例について図面を参照し
ながら説明する。第２図は本考案の第１の実施例
における電圧非直線抵抗器の断面図を示すもので
ある。第２図において、５は酸化亜鉛を主成分と
する電圧非直線抵抗体の焼結体、６ａ，６ｂは上
記焼結体５の相対向する面に形成された銀電極、
７ａ，７ｂは上記銀電極６ａ，６ｂの相対向する
部分を被覆している樹脂やガラスからなる絶縁
物、８ａ，８ｂは上記銀電極６ａ，６ｂの絶縁物
７ａ，７ｂで被覆されていない部分にハンダ９
ａ，９ｂで接続されているリード線である。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows a cross-sectional view of a voltage nonlinear resistor according to a first embodiment of the present invention. In FIG. 2, reference numeral 5 denotes a sintered body of a voltage nonlinear resistor containing zinc oxide as a main component; 6a and 6b denote silver electrodes formed on opposing surfaces of the sintered body 5;
7a and 7b are insulators made of resin or glass that cover opposing parts of the silver electrodes 6a and 6b, and 8a and 8b are parts of the silver electrodes 6a and 6b that are not covered with the insulators 7a and 7b. solder 9
These are lead wires connected at a and 9b.
このような実施例によれば、バリスタ特性を出
している部分での電位障壁の破壊は起らず、バリ
スタ電圧のバラツキや低下は生じなく、極性がつ
くこともない。 According to such an embodiment, the breakdown of the potential barrier in the portion exhibiting varistor characteristics does not occur, the varistor voltage does not vary or decrease, and polarity does not occur.
考案の効果
以上のように構成された本考案の電圧非直線抵
抗器によれば、電極の相対向する部分を絶縁物で
被覆し、この絶縁物で被覆されない両面の電極部
にリード線をそれぞれハンダ付けすることによ
り、ハンダが電極面の相対向する部分に回り込ま
ないため、バリスタ特性を出している部分での電
位障壁の破壊はなくなり、バリスタ電圧のバラツ
キや極性がつくということはなくなるものであ
る。したがつて、バリスタ特性を大巾に改善で
き、歩留り向上にも役立ち、その実用的価値は大
なるものがある。Effects of the Invention According to the voltage nonlinear resistor of the present invention configured as described above, the opposing parts of the electrodes are covered with an insulating material, and the lead wires are connected to the electrode parts on both sides that are not covered with the insulating material. By soldering, the solder does not wrap around the opposite parts of the electrode surface, so the potential barrier in the part that exhibits varistor characteristics will not be destroyed, and the varistor voltage will not vary or have polarity. be. Therefore, the varistor characteristics can be greatly improved, and it is also useful for increasing yield, so it has great practical value.
第１図は従来例の電圧非直線抵抗器を示す断面
図、第２図は本考案の実施例を示す電圧非直線抵
抗器の断面図である。
５……焼結体、６ａ，６ｂ……電極（銀電極）、
７ａ，７ｂ……絶縁物、８ａ，８ｂ……リード
線、９ａ，９ｂ……ハンダ。
FIG. 1 is a cross-sectional view of a conventional voltage non-linear resistor, and FIG. 2 is a cross-sectional view of a voltage non-linear resistor according to an embodiment of the present invention. 5... Sintered body, 6a, 6b... Electrode (silver electrode),
7a, 7b...Insulator, 8a, 8b...Lead wire, 9a, 9b...Solder.
Claims (1)
抗体焼結体の相対向する面に互いに相異なる一端
部を残して電極を形成し、上記電極面の相対向す
る部分を樹脂等の絶縁物で被覆し、上記絶縁物で
被覆されない両面の電極部の互いに相異なる部分
にリード線をそれぞれハンダ付けしたことを特徴
とする電圧非直線抵抗器。 Electrodes are formed on opposing surfaces of a flat plate-shaped voltage nonlinear resistor sintered body containing zinc oxide as a main component, leaving one end portion different from each other, and the opposing portions of the electrode surfaces are insulated with resin or the like. 1. A voltage nonlinear resistor characterized in that the voltage nonlinear resistor is covered with a material and lead wires are soldered to mutually different portions of the electrode portions on both surfaces not covered with the insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1318283U JPS59119005U (en) | 1983-01-31 | 1983-01-31 | voltage nonlinear resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1318283U JPS59119005U (en) | 1983-01-31 | 1983-01-31 | voltage nonlinear resistor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59119005U JPS59119005U (en) | 1984-08-11 |
| JPH0121526Y2 true JPH0121526Y2 (en) | 1989-06-27 |
Family
ID=30144573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1318283U Granted JPS59119005U (en) | 1983-01-31 | 1983-01-31 | voltage nonlinear resistor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59119005U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3731966C3 (en) * | 1986-09-26 | 1995-02-09 | Gen Electric | Surface mount varistor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56148802A (en) * | 1980-04-21 | 1981-11-18 | Tdk Electronics Co Ltd | Chip type varistor and method of manufacturing same |
-
1983
- 1983-01-31 JP JP1318283U patent/JPS59119005U/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56148802A (en) * | 1980-04-21 | 1981-11-18 | Tdk Electronics Co Ltd | Chip type varistor and method of manufacturing same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59119005U (en) | 1984-08-11 |
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