JPS61108105A - Thermistor element - Google Patents
Thermistor elementInfo
- Publication number
- JPS61108105A JPS61108105A JP22892684A JP22892684A JPS61108105A JP S61108105 A JPS61108105 A JP S61108105A JP 22892684 A JP22892684 A JP 22892684A JP 22892684 A JP22892684 A JP 22892684A JP S61108105 A JPS61108105 A JP S61108105A
- Authority
- JP
- Japan
- Prior art keywords
- thermistor element
- thermistor
- heat
- resistance value
- present
- 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
Landscapes
- Details Of Resistors (AREA)
- Thermistors And Varistors (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、サーミスタ素材表面に無機接着剤を塗布、焼
付けたサーミスタ素子に関するもので、特に自動車等に
利用されているオイルレベルゲージ用サーミスタ素子に
関するものである。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a thermistor element in which an inorganic adhesive is coated and baked on the surface of a thermistor material, and in particular to a thermistor element for oil level gauges used in automobiles, etc. It is related to.
（従来例の構成とその問題点）
サーミスタは一般に、マンガン、ニッケル、コバルト、
鉄などの遷移金属酸化物を用いて作られ、温度に体して
、負の抵抗値変化を示し、この性質を利用して、温度検
知センサ、液面検知センサ、温度補償用等に広く用いら
れている。(Conventional structure and its problems) Thermistors are generally made of manganese, nickel, cobalt,
It is made using transition metal oxides such as iron, and exhibits a negative resistance change with temperature. Taking advantage of this property, it is widely used in temperature detection sensors, liquid level detection sensors, temperature compensation, etc. It is being
従来より用いられているサーミスタ素子は第１図に示す
ように、サーミスタ素材１、電極２、圧入キャップ３、
耐熱有機絶縁塗料４から形成されている。いわゆるロッ
ド型サーミスタが一般的である。このサーミスタ素子は
防爆構造の金属ケースに収納されている。このユニット
を一定の位置に固定し、サーミスタ素子が液面の上にあ
るか、下にあるかによって、サーミスタ素子の抵抗値が
変化し、液面のレベル検知をしている。このとき、サー
ミスタ素子が液の上に出ていると、液中にあるときより
熱放散が悪く、素子表面温度が上昇し、３００℃ないし
４５０℃に達することがある。このような高温になると
、電極に使用している銀がマイグレーションを起こし、
電極間でショートして、サーミスタ素子の機能を損なう
。またマイグレーションを防ぐために、従来より、シリ
コン系の耐熱有機塗料を表面に塗布して保護しているが
、高温になると、有機物が炭化したり、または、表面に
ピンホール等ができ、腐蝕が発生してサーミスタ素子を
劣化させ、機能を損なう欠点があった。As shown in Fig. 1, a conventionally used thermistor element consists of a thermistor material 1, an electrode 2, a press-fit cap 3,
It is formed from a heat-resistant organic insulating paint 4. So-called rod-type thermistors are common. This thermistor element is housed in an explosion-proof metal case. This unit is fixed at a fixed position, and the resistance value of the thermistor element changes depending on whether it is above or below the liquid level, and the level of the liquid level is detected. At this time, if the thermistor element is above the liquid, heat dissipation is worse than when it is in the liquid, and the element surface temperature rises and may reach 300°C to 450°C. At such high temperatures, the silver used in the electrodes undergoes migration.
A short circuit occurs between the electrodes, damaging the function of the thermistor element. In addition, to prevent migration, a silicone-based heat-resistant organic paint has traditionally been applied to the surface to protect it, but at high temperatures, the organic matter carbonizes or pinholes form on the surface, causing corrosion. This has the drawback of degrading the thermistor element and impairing its functionality.
（発明の目的）
本発明の目的は、従来の欠点を解消し、高信頼性を有す
るサーミスタ素子を提供することである。(Object of the Invention) An object of the present invention is to eliminate the conventional drawbacks and provide a thermistor element having high reliability.
（発明の構成）
本発明のサーミスタ素子は、電極に銀を用いたサーミス
タ素材に、特殊チタン化合物、アルミナ化合物、ジルコ
ニア化合物を主原料とした、耐熱性無機接着剤を塗布、
焼付けしたものである。(Structure of the Invention) The thermistor element of the present invention includes a thermistor material using silver for electrodes, coated with a heat-resistant inorganic adhesive mainly made of a special titanium compound, an alumina compound, and a zirconia compound.
It is baked.
（実施例の説明）
本発明の一実施例を第２図および第３図に基づいて説明
する。第２図は本発明の一実施例によるサーミスタ素子
の断面図である。同図において５は特殊チタン化合物、
アルミナ化合物、ジルコニア化合物を主原料とした耐熱
性無機接着剤（商品名、Ｇ５−９００、■コスモス化成
）で素子表面を均一に５０μｍないし１００μ■の厚さ
に塗布し、２５０℃ないし３００℃の温度で、１５分な
いし２０分間焼付けをする。こうして製作したサーミス
タ素子を、オイルレベルゲージユニットに組み込み、過
酷なりＣ２０Ｖ連続通電試験を実施した結果、第３図に
示すように、従来品に比べ、抵抗値変化が少なく非常に
安定しており、信頼性が向上することがわかった。(Description of Embodiment) An embodiment of the present invention will be described based on FIGS. 2 and 3. FIG. 2 is a sectional view of a thermistor element according to an embodiment of the present invention. In the figure, 5 is a special titanium compound,
A heat-resistant inorganic adhesive (trade name: G5-900, Cosmos Chemical Co., Ltd.) mainly made of alumina compounds and zirconia compounds is coated uniformly on the element surface to a thickness of 50 μm to 100 μm. Bake at high temperature for 15 to 20 minutes. The thermistor element thus manufactured was assembled into an oil level gauge unit and subjected to a severe C20V continuous energization test.As shown in Figure 3, it was found to be extremely stable with less resistance value change compared to conventional products. It was found that reliability was improved.
同図においてＡは従来品、Ｂは本発明品の抵抗値変化特
性である。In the figure, A is the resistance value change characteristic of the conventional product, and B is the resistance value change characteristic of the present invention product.
塗布膜厚が５０μｍより薄くなると、抵抗値変化が大き
くなるものが出てくる。また、厚く塗布しすぎると熱応
答性が遅くなり、好ましくない。When the coating film thickness becomes thinner than 50 μm, some products exhibit a large change in resistance value. Moreover, if it is applied too thickly, the thermal response becomes slow, which is not preferable.
（発明の効果）
以上説明したように、本発明によれば、オイルレベルゲ
ージに用いられるサーミスタ素子の表面温度が３００℃
ないし４５０℃という高温になっても、電極のマイグレ
ーション、あるいは、絶縁膜の劣化という欠点を除裏す
ることができ、高信頼性のサーミスタ素子を得ることが
できる効果がある。(Effects of the Invention) As explained above, according to the present invention, the surface temperature of the thermistor element used in the oil level gauge is 300°C.
Even at high temperatures ranging from 450° C. to 450° C., defects such as electrode migration or deterioration of the insulating film can be eliminated, and a highly reliable thermistor element can be obtained.
第１図は従来のサーミスタ素子の断面図、第２図は本発
明によるサーミスタ素子の断面図、第３図は空中連続通
電試験抵抗値変化特性図である。
１ ・・・サーミスタ素材、 ２・・・電極、 ３ ・
・・圧入キャップ、 ４ ・・・耐熱性有機絶縁塗料、
５ ・・耐熱性無機接着剤、 Ａ・・・従来品の抵抗値
変化特性、 Ｂ ・・・本発明品の抵抗値変化特性。
特許出願人 松下電器産業株式会社
第１図FIG. 1 is a sectional view of a conventional thermistor element, FIG. 2 is a sectional view of a thermistor element according to the present invention, and FIG. 3 is a resistance value change characteristic diagram in an air continuous energization test. 1...Thermistor material, 2...Electrode, 3.
・・Press-fit cap, 4 ・・Heat-resistant organic insulation paint,
5...Heat-resistant inorganic adhesive, A...Resistance value change characteristics of the conventional product, B...Resistance value change characteristics of the present invention product. Patent applicant Matsushita Electric Industrial Co., Ltd. Figure 1
Claims (1)
ルミナ化合物、ジルコニア化合物を主原料とした耐熱性
無機接着剤を塗布、焼付けたことを特徴とするサーミス
タ素子。A thermistor element characterized by a thermistor that uses silver for electrodes, coated with a heat-resistant inorganic adhesive whose main ingredients are a special titanium compound, alumina compound, or zirconia compound and then baked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22892684A JPS61108105A (en) | 1984-11-01 | 1984-11-01 | Thermistor element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22892684A JPS61108105A (en) | 1984-11-01 | 1984-11-01 | Thermistor element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61108105A true JPS61108105A (en) | 1986-05-26 |
Family
ID=16884020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22892684A Pending JPS61108105A (en) | 1984-11-01 | 1984-11-01 | Thermistor element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61108105A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50159376A (en) * | 1974-06-12 | 1975-12-23 | ||
| JPS5280448A (en) * | 1975-12-26 | 1977-07-06 | Matsushita Electric Ind Co Ltd | Thermistor |
| JPS55166902A (en) * | 1979-06-14 | 1980-12-26 | Matsushita Electric Ind Co Ltd | High temperature heattsensitive element |
| JPS57208108A (en) * | 1981-06-17 | 1982-12-21 | Matsushita Electric Ind Co Ltd | Thin film thermistor |
| JPS5848901A (en) * | 1981-09-18 | 1983-03-23 | 日本特殊陶業株式会社 | High temperature thermistor |
-
1984
- 1984-11-01 JP JP22892684A patent/JPS61108105A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50159376A (en) * | 1974-06-12 | 1975-12-23 | ||
| JPS5280448A (en) * | 1975-12-26 | 1977-07-06 | Matsushita Electric Ind Co Ltd | Thermistor |
| JPS55166902A (en) * | 1979-06-14 | 1980-12-26 | Matsushita Electric Ind Co Ltd | High temperature heattsensitive element |
| JPS57208108A (en) * | 1981-06-17 | 1982-12-21 | Matsushita Electric Ind Co Ltd | Thin film thermistor |
| JPS5848901A (en) * | 1981-09-18 | 1983-03-23 | 日本特殊陶業株式会社 | High temperature thermistor |
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