JPS6348083Y2 - - Google Patents
Info
- Publication number
- JPS6348083Y2 JPS6348083Y2 JP1981036990U JP3699081U JPS6348083Y2 JP S6348083 Y2 JPS6348083 Y2 JP S6348083Y2 JP 1981036990 U JP1981036990 U JP 1981036990U JP 3699081 U JP3699081 U JP 3699081U JP S6348083 Y2 JPS6348083 Y2 JP S6348083Y2
- Authority
- JP
- Japan
- Prior art keywords
- element body
- conductive rubber
- electrodes
- electrode
- varistor
- 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
- 229920001971 elastomer Polymers 0.000 claims description 12
- 239000005060 rubber Substances 0.000 claims description 12
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 5
- 239000011787 zinc oxide Substances 0.000 claims description 5
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 4
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910002113 barium titanate Inorganic materials 0.000 claims description 3
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 claims description 3
- 239000002075 main ingredient Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229920003002 synthetic resin Polymers 0.000 claims description 3
- 239000000057 synthetic resin Substances 0.000 claims description 3
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 claims description 3
- 229910001887 tin oxide Inorganic materials 0.000 claims description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001111 Fine metal Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
Landscapes
- Thermistors And Varistors (AREA)
- Details Of Resistors (AREA)
Description
【考案の詳細な説明】
本考案は電極構造を改良したセラミツクバリス
タに関する。[Detailed Description of the Invention] The present invention relates to a ceramic varistor with an improved electrode structure.
従来、セラミツクバリスタの電極構造としては
導電性およびハンダ付性が良好でしかも乾燥焼付
を酸化雰囲気中で行えるなどの条件を満足するも
のとして、銀ペーストを塗布−焼付によつて構成
している。しかしてこのような電極構造をもつバ
リスタとしては第１図に示すように酸化亜鉛を主
成分とし他に数種類の金属酸化物を混合した粉体
を柱状に成型し800〜1500℃の高温で焼結した素
体１の両面に銀ペーストを塗布−焼付けて電極２
ａ，２ｂを形成する。しかるのち、該電極２ａ，
２ｂにリード線３ａ，３ｂをハンダ４付で取着し
合成樹脂を被覆して外装５を施してなるものであ
る。しかしながら、電極２ａ，２ｂを構成する銀
およびハンダと素体１との熱膨張係数が違うため
使用中の温度変化によつて電極２ａ，２ｂと素体
１の接触界面に引張応力が働き電極２ａ，２ｂが
剥離し部分的にその部分の接触抵抗が増加する。
しかして、サージエネルギーが印加されると電極
２ａ，２ｂの接触抵抗の最も低い部分に電流が集
中するためエネルギーが局部で吸収され素体１の
劣化を促進する。 Conventionally, the electrode structure of a ceramic varistor has been constructed by applying and baking a silver paste to satisfy conditions such as good conductivity and solderability, and dry baking in an oxidizing atmosphere. However, as shown in Figure 1, a varistor with such an electrode structure is made by molding a powder containing zinc oxide as the main component and a mixture of several other metal oxides into a column shape and baking it at a high temperature of 800 to 1,500 degrees Celsius. Apply silver paste to both sides of the bonded element 1 and bake it to form the electrode 2.
Form a and 2b. After that, the electrode 2a,
Lead wires 3a and 3b are attached to 2b with solder 4, and an exterior 5 is provided by covering the lead wires 2b with synthetic resin. However, since the thermal expansion coefficients of the silver and solder that constitute the electrodes 2a and 2b and the element body 1 are different, tensile stress is exerted on the contact interface between the electrodes 2a and 2b and the element body 1 due to temperature changes during use. , 2b peels off, and the contact resistance at that part increases.
When surge energy is applied, the current is concentrated at the lowest contact resistance portions of the electrodes 2a and 2b, and the energy is locally absorbed, promoting deterioration of the element body 1.
したがつて、自動車などの温度変化の激しい箇
所での使用には自ずから限度があつた。 Therefore, there is a natural limit to its use in locations subject to rapid temperature changes, such as in automobiles.
本考案は上記の点に鑑みてなされたもので、素
体両端面に導電性ラバー電極を圧接し、かつ該電
極にリード線を圧接し外装樹脂で一体化すること
によつて小形で温度変化による電極剥離のない、
しかもハンダ付作業を省略できるセラミツクバリ
スタを提供することを目的とするものである。 The present invention was developed in view of the above points, and it is compact and temperature-changeable by press-contacting conductive rubber electrodes to both end faces of the element body, press-conducting lead wires to the electrodes, and integrating them with exterior resin. No electrode peeling due to
Moreover, it is an object of the present invention to provide a ceramic varistor that can omit soldering work.
以下本考案の一実施例につき図面を参照して説
明する。すなわち、第２図に示すように酸化亜
鉛、酸化チタン、酸化錫、チタン酸バリウムなど
を主成分とし、他に数種類の金属酸化物を混合し
てなる粉体を例えば柱状または板状に成型し、
800〜1500℃の高温で焼結した素体１１の両端面
に該素体１１の外径より小径に形成した例えば合
成ゴムにカーボンまたは金属微粉末を混入してな
る導電性ラバー電極１２ａ，１２ｂを配設し、該
電極１２ａ，１２ｂにヘツダー加工したリード線
１３ａ，１３ｂのヘツダー加工部を当接し該リー
ド線１３ａ，１３ｂで前記電極１２ａ，１２ｂを
押圧することによつて、前記素体１１両端面に導
電性ラバー電極１２ａ，１２ｂを該電極１２ａ，
１２ｂにリード線１３ａ，１３ｂをそれぞれ圧接
し合成樹脂を被覆して外装１４を施し一体化して
なるものである。 An embodiment of the present invention will be described below with reference to the drawings. That is, as shown in Figure 2, a powder containing zinc oxide, titanium oxide, tin oxide, barium titanate, etc. as the main ingredients, mixed with several other metal oxides, is formed into a columnar or plate shape, for example. ,
Conductive rubber electrodes 12a and 12b made of, for example, synthetic rubber mixed with carbon or fine metal powder are formed on both end faces of the element body 11 sintered at a high temperature of 800 to 1500° C. to have a diameter smaller than the outer diameter of the element body 11. The element body 11 Conductive rubber electrodes 12a, 12b are attached to both end faces of the electrodes 12a, 12b.
Lead wires 13a and 13b are respectively pressed onto 12b and covered with synthetic resin, and then an exterior 14 is applied and integrated.
以上のように構成してなるバリスタは、電極と
して弾性を有する導電性ラバー電極１２ａ，１２
ｂを用い、素体１１端面に面接触状態で圧接され
ているため、初期状態においてはもとより温度変
化によつて引張応力が働いても素体１１と導電性
ラバー電極１２ａ，１２ｂとの剥離現象は皆無で
あり、その部分の接触抵抗に変化はない。したが
つて使用中サージエネルギーが印加された場合で
も電流は面接触となつている素体１１と導電性ラ
バー電極１２ａ，１２ｂの接触面全体で吸収され
るため、電流の局部集中はなく素体１１の劣化を
促進するようなことはなく、−40℃〜＋150℃の広
い温度範囲において安定した性能を発揮でき、自
動車などの温度変化の激しい箇所で使用しても特
性劣化はしない。また電極の焼付工程ならびにリ
ード線のハンダ付工程を完全に省略でき、作業工
程の簡略化にも大きく貢献できる利点をもつてい
る。 The varistor configured as described above has elastic conductive rubber electrodes 12a, 12 as electrodes.
b, and are pressed against the end face of the element body 11 in surface contact, so that peeling phenomenon between the element body 11 and the conductive rubber electrodes 12a and 12b occurs not only in the initial state but also even when tensile stress is applied due to temperature changes. There is no change in the contact resistance of that part. Therefore, even if surge energy is applied during use, the current is absorbed by the entire contact surface between the element body 11 and the conductive rubber electrodes 12a and 12b, which are in surface contact, so there is no local concentration of current and the element body 11, and exhibits stable performance over a wide temperature range of -40°C to +150°C, and its characteristics do not deteriorate even when used in locations subject to rapid temperature changes, such as in automobiles. Furthermore, the baking process of the electrodes and the process of soldering the lead wires can be completely omitted, which has the advantage of greatly contributing to the simplification of the work process.
次に実験結果をもとに本考案の優位性について
説明する。まず試料としてZnO 96モル％、MgO
１モル％ その他Bi2O3，CoO，Sb2O3，MnO2，
Cr2O3，SiO2の組成をそれぞれ0.5モル％混合して
なる粉体を直径3.5mm、厚さ４mmの円柱状に成型
し1200℃で焼結した素体50個を作り、その中の25
個の素体両端面に直径３mm、厚さ0.25mmの導電性
ラバー電極を圧接し第２図に示すように構成して
本考案品Ａとし、残りの25個は素体両端面に外周
縁を残して銀電極を形成し、第１図に示すように
構成して従来品ＢとしＡ，Ｂにおけるヒートサイ
クル試験を行い、その結果を第３図に示した。第
３図は10サイクル毎に８×20μsec10Aを正逆各10
回印加しサイクル回数に対するバリスタ電圧の変
化率を示したものである。第３図から明らかなよ
うに、従来品Ｂはサイクル回数が増える毎にバリ
スタ電圧の変化率が大きくなり、かつバラツキも
大きくなり特性劣化の激しいことを示している。
本考案品Ａは50サイクル回数時点でもほとんど変
化なく本考案の優れた効果を実証した。 Next, the advantages of the present invention will be explained based on experimental results. First, as samples, 96 mol% ZnO, MgO
1 mol% Others Bi 2 O 3 , CoO, Sb 2 O 3 , MnO 2 ,
Powder consisting of a mixture of 0.5 mol% each of Cr 2 O 3 and SiO 2 was molded into cylindrical shapes with a diameter of 3.5 mm and a thickness of 4 mm, and sintered at 1200°C to make 50 element bodies. twenty five
Conductive rubber electrodes with a diameter of 3 mm and a thickness of 0.25 mm are pressure-welded to both end faces of the element bodies, and the structure shown in Fig. 2 is made to be the product A of the present invention. A conventional product B was constructed as shown in FIG. 1, and a heat cycle test was conducted on A and B, and the results are shown in FIG. 3. Figure 3 shows 8x20μsec10A every 10 cycles, 10 times each in forward and reverse directions.
This figure shows the rate of change in varistor voltage with respect to the number of cycles. As is clear from FIG. 3, in conventional product B, as the number of cycles increases, the rate of change in the varistor voltage increases, and the variation also increases, indicating that the characteristics are severely degraded.
Product A of the present invention showed almost no change even after 50 cycles, demonstrating the excellent effects of the present invention.
以上述べたように本考案によれば、酸化亜鉛、
酸化チタン、酸化錫、チタン酸バリウムなどを主
成分とし、他に数種類の金属酸化物を混合した粉
体を柱状または板状に成型し焼結した素体の両端
面に導電性ラバー電極を圧接し、かつ該導電性ラ
バー電極にリード線を圧接し外装樹脂で一体化す
ることによつて、小形で作業性容易にして初期特
性はもとより温度変化による特性劣化のない優れ
た特性のセラミツクバリスタを得供することがで
きる。 As described above, according to the present invention, zinc oxide,
Powder containing titanium oxide, tin oxide, barium titanate, etc. as the main ingredients, mixed with several other metal oxides, is molded into a column or plate shape and sintered, and conductive rubber electrodes are pressure welded to both end faces of the element body. By press-contacting the lead wire to the conductive rubber electrode and integrating it with an exterior resin, we can create a ceramic varistor that is small and easy to work with, and has excellent initial characteristics and does not deteriorate due to temperature changes. You can benefit from it.
第１図は従来例によるバリスタを示す断面図、
第２図は本考案の一実施例によるバリスタを示す
断面図、第３図はヒートサイクル回数に対応する
バリスタ電圧の変化率を示す特性曲線図である。
１１……素体、１２ａ，１２ｂ……導電性ラバ
ー電極、１３ａ，１３ｂ……リード線、１４……
外装。
FIG. 1 is a sectional view showing a conventional varistor;
FIG. 2 is a sectional view showing a varistor according to an embodiment of the present invention, and FIG. 3 is a characteristic curve diagram showing a rate of change in varistor voltage corresponding to the number of heat cycles. 11...Element body, 12a, 12b...Conductive rubber electrode, 13a, 13b...Lead wire, 14...
Exterior.
Claims (1)
ウムなどを主成分とし他に数種類の金属酸化物を
混合した粉体を焼結した素体と、該素体の両端面
に圧接した導電性ラバー電極と、該電極に圧接し
たリード線と、該リード線と前記導電性ラバー電
極および前記素体を一体に外装した合成樹脂とを
具備したことを特徴とするセラミツクバリスタ。 An element body made of sintered powder containing zinc oxide, titanium oxide, tin oxide, barium titanate, etc. as the main ingredients and a mixture of several other metal oxides, and conductive rubber electrodes pressed onto both end faces of the element body. A ceramic varistor comprising: a lead wire pressed into contact with the electrode; and a synthetic resin integrally sheathing the lead wire, the conductive rubber electrode, and the element body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981036990U JPS6348083Y2 (en) | 1981-03-16 | 1981-03-16 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1981036990U JPS6348083Y2 (en) | 1981-03-16 | 1981-03-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57150904U JPS57150904U (en) | 1982-09-22 |
| JPS6348083Y2 true JPS6348083Y2 (en) | 1988-12-12 |
Family
ID=29834200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1981036990U Expired JPS6348083Y2 (en) | 1981-03-16 | 1981-03-16 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6348083Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4211569Y1 (en) * | 1964-10-26 | 1967-06-28 | ||
| JPS5457658A (en) * | 1977-10-18 | 1979-05-09 | Shinetsu Polymer Co | Electronic circuit parts |
-
1981
- 1981-03-16 JP JP1981036990U patent/JPS6348083Y2/ja not_active Expired
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4211569Y1 (en) * | 1964-10-26 | 1967-06-28 | ||
| JPS5457658A (en) * | 1977-10-18 | 1979-05-09 | Shinetsu Polymer Co | Electronic circuit parts |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57150904U (en) | 1982-09-22 |
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