JPH05198403A - Organic positive temperature coefficient characteristics thermistor - Google Patents
Organic positive temperature coefficient characteristics thermistorInfo
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- JPH05198403A JPH05198403A JP754492A JP754492A JPH05198403A JP H05198403 A JPH05198403 A JP H05198403A JP 754492 A JP754492 A JP 754492A JP 754492 A JP754492 A JP 754492A JP H05198403 A JPH05198403 A JP H05198403A
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- conductive particles
- temperature coefficient
- resistance value
- positive temperature
- organic positive
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、有機質正特性サーミス
タに関し、より詳しくは、昇温時特定の温度領域で急激
に抵抗値が増大する特性、すなわち、ＰＴＣ（Positive
TemperatureCoefficient）特性を有する有機質正特性
サーミスタに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic positive temperature coefficient thermistor, and more specifically, to a characteristic in which the resistance value rapidly increases in a specific temperature range when the temperature is raised, that is, PTC (Positive).
The present invention relates to an organic positive temperature coefficient thermistor having a temperature coefficient.
【０００２】[0002]
【従来の技術】従来、有機質正特性サーミスタとして、
ポリエチレン若しくはポリプロピン等の熱可塑性樹脂に
金属粉末やカーボンブラックを分散させたもの（例え
ば、米国特許第３５９１５２６号明細書等）や、エポキ
シ樹脂，ポリイミド，不飽和ポリエステル，シリコン，
ポリウレタン及びフェノール樹脂等の熱硬化性樹脂に、
炭素繊維，黒鉛繊維，黒鉛層間化合物繊維，金属繊維及
びセラミック繊維等の繊維状導電物質等を分散させたも
のが知られている（例えば、米国特許第４９６６７２９
号明細書等）。2. Description of the Related Art Conventionally, as an organic positive temperature coefficient thermistor,
Metal powder or carbon black dispersed in a thermoplastic resin such as polyethylene or polypropyne (for example, US Pat. No. 3,591,526), epoxy resin, polyimide, unsaturated polyester, silicone,
For thermosetting resins such as polyurethane and phenolic resins,
It is known that fibrous conductive materials such as carbon fiber, graphite fiber, graphite intercalation compound fiber, metal fiber and ceramic fiber are dispersed (for example, US Pat. No. 4,966,729).
No. etc.).
【０００３】このような有機質正特性サーミスタは、例
えば温度検出器又は自己制御型ヒーター等に適用し得る
が、ＰＴＣ特性の立ち上がりが急峻で大きな抵抗値変化
を呈し、しかも室温での初期抵抗値が小さいことが必要
である。Such an organic positive temperature coefficient thermistor can be applied to, for example, a temperature detector or a self-regulating heater, but the PTC characteristic has a sharp rise and exhibits a large resistance change, and the initial resistance value at room temperature is large. It needs to be small.
【０００４】[0004]
【発明が解決しようとする課題】しかし、従来の有機質
正特性サーミスタにおいては、熱可塑性樹脂の場合は、
架橋処理や不燃化処理が必要であり、熱硬化性樹脂の場
合は、分散された導電性物質が繊維状であるため、抵抗
値のばらつきが大きく、また、初期抵抗値を下げること
が難しいという問題があった。However, in the conventional organic positive temperature coefficient thermistor, in the case of the thermoplastic resin,
In the case of thermosetting resin, it is necessary to carry out cross-linking treatment or incombustibility treatment, and since the dispersed conductive substance is fibrous, the resistance value varies widely, and it is difficult to lower the initial resistance value. There was a problem.
【０００５】そこで、本発明は、上記事情に鑑みてなさ
れたものであり、室温での初期抵抗値が小さく、ＰＴＣ
特性の立ち上がりが急峻で大きな抵抗値変化を呈し、し
かも抵抗値のばらつきが小さい有機質正特性サーミスタ
を提供することを目的とする。Therefore, the present invention has been made in view of the above circumstances and has a small initial resistance value at room temperature,
It is an object of the present invention to provide an organic positive temperature coefficient thermistor which has a sharp rise in characteristics, exhibits a large resistance value change, and has a small resistance value variation.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に請求項１記載の発明は、熱硬化性樹脂とスパイク状の
突起を有する導電性粒子とを混合してなることを特徴と
する有機質正特性サーミスタである。In order to achieve the above object, the invention according to claim 1 is characterized by mixing a thermosetting resin and conductive particles having spike-like protrusions. It is a positive temperature coefficient thermistor.
【０００７】また、請求項２記載の発明は、請求項１記
載の発明において、前記導電性粒子の含有量を５乃至６
５重量％とするものである。According to a second aspect of the invention, in the invention of the first aspect, the content of the conductive particles is 5 to 6
The amount is 5% by weight.
【０００８】[0008]
【作用】請求項１記載の発明によれば、熱硬化性樹脂と
混合する導電性粒子としてスパイク状の突起を有する粒
子を用いているので、真球状の導電性粒子を混合した場
合に比べ、スパイク状の突起を有する導電性粒子同士で
は、その形状故にトンネル電流が流れやすくなって、導
電性が良好となるため、室温での初期抵抗値が小さくな
る。また、導電性粒子同士の間隔が球状のものに比べて
大きいので、接触点で容易に切れてＰＴＣ特性の立ち上
がりが急峻で大きな抵抗値変化を呈する。また、繊維状
の導電性粒子を混合した場合に比べ、抵抗値のばらつき
が小さくなる。According to the invention of claim 1, since particles having spike-like protrusions are used as the conductive particles to be mixed with the thermosetting resin, compared with the case of mixing true spherical conductive particles, A tunnel current easily flows between the conductive particles having spike-like protrusions due to their shape, and the conductivity is improved, so that the initial resistance value at room temperature becomes small. Further, since the distance between the conductive particles is larger than that of the spherical particles, the conductive particles are easily broken at the contact point, the PTC characteristic rises sharply, and a large change in resistance value is exhibited. Further, the variation in resistance value is smaller than that in the case where fibrous conductive particles are mixed.
【０００９】更に、導電性粒子と混合する樹脂として熱
硬化性樹脂を用いているので、不燃性であり、熱可塑性
樹脂を用いた場合に比べ、架橋処理が不要となり、製造
工程を簡略化できる等の優れた効果が得られる。Furthermore, since a thermosetting resin is used as the resin mixed with the conductive particles, it is nonflammable and requires no crosslinking treatment as compared with the case where a thermoplastic resin is used, and the manufacturing process can be simplified. And so on.
【００１０】請求項２記載の発明によれば、導電性粒子
の含有量を５乃至６５重量％好ましくは２０乃至５５重
量％とすることにより、導電性粒子をスパイク状の突起
を有する粒子としたことによる前記特有の効果がより顕
著となる。According to the second aspect of the invention, the content of the conductive particles is 5 to 65% by weight, preferably 20 to 55% by weight, so that the conductive particles are particles having spike-like projections. As a result, the above-mentioned unique effect becomes more remarkable.
【００１１】[0011]
【実施例】以下、本発明の実施例を詳述する。EXAMPLES Examples of the present invention will be described in detail below.
【００１２】本発明の一実施例の有機質正特性サーミス
タは、主剤（マトリックス）として熱硬化性樹脂，フィ
ラーとしてスパイク状の突起を有する導電性粒子及び硬
化剤を混合してなるものである。An organic positive temperature coefficient thermistor according to one embodiment of the present invention is a mixture of a thermosetting resin as a main component (matrix), conductive particles having spike-like protrusions as a filler, and a curing agent.
【００１３】前記熱硬化性樹脂としては、エポキシ樹
脂，ポリイミド，不飽和ポリエステル，シリコン，ポリ
ウレタン及びフェノール樹脂等がある。熱硬化性樹脂
は、所望の性能，用途等に応じて適宜選択することがで
き、本実施例では、エポキシ樹脂（チバガイギー製のア
ラルダイトＦ）を用いる。Examples of the thermosetting resin include epoxy resin, polyimide, unsaturated polyester, silicone, polyurethane and phenol resin. The thermosetting resin can be appropriately selected according to the desired performance, application, etc. In this embodiment, an epoxy resin (Araldite F made by Ciba-Geigy) is used.
【００１４】前記スパイク状の突起を有する導電性粒子
としては、平均粒径３乃至７μｍのスパイク状の突起を
有するＮｉパウダーと同等の効果が得られる平均粒径
２．２乃至２．８μｍ（フィッシャー・サブシーブ法で
測定）のフィラメント状鎖状Ｎｉパウダー（インコ社
製）を用いる。The conductive particles having the spike-shaped protrusions have an average particle diameter of 2.2 to 2.8 μm (Fisher), which has the same effect as the Ni powder having the spike-shaped protrusions having an average particle diameter of 3 to 7 μm. -Filamentary chain Ni powder (measured by the subsieve method) (manufactured by Inco) is used.
【００１５】前記硬化剤としては、チバガイギー製のハ
ードナーを用いる。A hardener made by Ciba-Geigy is used as the curing agent.
【００１６】前記有機質正特性サーミスタの一製造方法
としては、所定量の前記各組織を混合（真空撹拌脱泡）
し、これを電極（例えばＮｉ箔）間に流し込んでシート
状にプレス成形し、これを硬化（予備硬化として８０
℃，３０分、本硬化として１４０℃，１時間）後、パン
チングにより板状の有機質正特性サーミスタを得る。As a method of manufacturing the organic positive temperature coefficient thermistor, a predetermined amount of each of the tissues is mixed (vacuum stirring defoaming).
Then, it is poured between the electrodes (for example, Ni foil) and press-formed into a sheet, which is cured (80% as pre-curing).
C., 30 minutes, main curing 140.degree. C., 1 hour) and punching to obtain a plate-shaped organic positive temperature coefficient thermistor.
【００１７】このように構成された有機質正特性サーミ
スタにより得られる効果を、表１及び図１乃至図５を参
照して説明する。表１は各組織の割合いを変えた有機質
正特性サーミスタの室温での初期抵抗値及び抵抗温度特
性を示すものである。図１乃至図６は、表１における実
施例１乃至４及び比較例１，２のそれぞれをグラフにし
たものである。The effects obtained by the organic positive temperature coefficient thermistor thus constructed will be described with reference to Table 1 and FIGS. Table 1 shows the initial resistance value and resistance temperature characteristic at room temperature of the organic positive temperature coefficient thermistor in which the proportion of each structure is changed. 1 to 6 are graphs of Examples 1 to 4 and Comparative Examples 1 and 2 in Table 1.
【００１８】[0018]
【表１】 実施例１乃至４のサンプルは、表１に示すように、アラ
ルダイトＦ，ハードナー，Ｎｉパウダーの各組織の割合
いを変えたものを混合（真空撹拌脱泡）し、これを電極
（Ｎｉ箔）間に流し込んでシート状にプレス成形し、こ
れを硬化（予備硬化として８０℃，３０分、本硬化とし
て１４０℃，１時間）後、直径１０ｍｍの円板状に打ち
抜いたものを用いた。[Table 1] As shown in Table 1, the samples of Examples 1 to 4 were mixed (vacuum agitation defoaming) in which the proportions of Araldite F, hardener, and Ni powder were changed, and this was used as an electrode (Ni foil). It was poured into a space, press-formed into a sheet, cured (80 ° C. for 30 minutes as preliminary curing, 140 ° C. for 1 hour for main curing), and then punched into a disk having a diameter of 10 mm.
【００１９】比較例１，２のサンプルは、フィラーとし
てＮｉパウダーの代りに炭素繊維（ドナカーボ；関西タ
ール製，長さ０．７ｍｍ，直径１０ｍｍ）を用いた。In the samples of Comparative Examples 1 and 2, carbon fiber (donacarb; manufactured by Kansai Tar Co., Ltd., length 0.7 mm, diameter 10 mm) was used as a filler instead of Ni powder.
【００２０】ＰＴＣ特性の測定は、実施例１乃至４及び
比較例１，２ともに、上記サンプルを恒温槽内に入れ、
温度上昇及び下降を行い、各所定温度における抵抗値を
測定し、温度と抵抗値との関係を求めた。The PTC characteristics were measured by placing the above sample in a constant temperature bath in each of Examples 1 to 4 and Comparative Examples 1 and 2.
The temperature was raised and lowered, the resistance value at each predetermined temperature was measured, and the relationship between the temperature and the resistance value was obtained.
【００２１】(a) 導電性粒子としてスパイク状の突起を
有する粒子を用いているので、真球状の導電性粒子を混
合した場合に比べ、スパイク状の突起を有する導電性粒
子同士では、その形状故にトンネル電流が流れやすくな
って、導電性が良好となるため、室温での初期抵抗値が
小さくなった。実施例１では１．５Ω、実施例２では
０．１０Ω、実施例３では０．０３Ω、実施例４では
０．０１Ωとなった。比較例１では１０Ω、比較例２で
は０．５Ωとなった。なお、Ｎｉパウダーの添加量が５
重量％未満では、抵抗値が逆に上昇してしまい、サーミ
スタとして使用できない結果となった。(A) Since the particles having spike-shaped protrusions are used as the conductive particles, the shapes of the conductive particles having spike-shaped protrusions are different from each other as compared with the case where the spherical conductive particles are mixed. Therefore, the tunnel current easily flows and the conductivity becomes good, so that the initial resistance value at room temperature becomes small. The resistance was 1.5Ω in Example 1, 0.10Ω in Example 2, 0.03Ω in Example 3, and 0.01Ω in Example 4. It was 10Ω in Comparative Example 1 and 0.5Ω in Comparative Example 2. The amount of Ni powder added is 5
If it is less than 10% by weight, the resistance value is increased on the contrary, and the result cannot be used as a thermistor.
【００２２】(b) スパイク状の突起を有する導電性粒子
同士の間隔が球状のものに比べて大きいので、接触点で
容易に切れてＰＴＣ特性の立ち上がりが急峻で大きな抵
抗値変化を呈した。実施例１では、転移温度では抵抗値
が急激に上昇して最大抵抗値は１×１０9 Ωになり、抵
抗変化率は１０9 以上の高い値となった。実施例２で
も、実施例１と同様に抵抗変化率は１０9 以上の高い値
となった。実施例４では、室温での初期抵抗値は上述し
たように０．０１Ωと低い値であるが、フィラーが過剰
に入っているため、転移温度においてもその導電経路が
遮断されず、抵抗変化率は１０3 と急激な抵抗上昇は見
られなかった。比較例１では、抵抗変化率は１０3.5 と
急激な抵抗上昇は見られなかった。比較例２では、室温
での抵抗値は前述したように０．５Ωと低い値である
が、抵抗変化率は１０2 と急激な抵抗上昇は見られなか
った。(B) Since the spacing between the conductive particles having spike-like protrusions is larger than that of the spherical particles, the conductive particles are easily broken at the contact point, the PTC characteristic rises sharply, and a large change in resistance value is exhibited. In Example 1, the resistance value drastically increased at the transition temperature, the maximum resistance value became 1 × 10 9 Ω, and the resistance change rate became a high value of 10 9 or more. In Example 2 as well, as in Example 1, the rate of resistance change was a high value of 10 9 or more. In Example 4, the initial resistance value at room temperature is as low as 0.01Ω as described above, but since the filler is excessively contained, the conductive path is not blocked even at the transition temperature, and the resistance change rate is high. The resistance was 10 3 and no sharp increase in resistance was observed. In Comparative Example 1, the rate of change in resistance was 10 3.5, and no sharp resistance increase was observed. In Comparative Example 2, the resistance value at room temperature was as low as 0.5Ω as described above, but the resistance change rate was 10 2 and no rapid resistance increase was observed.
【００２３】(c) 導電性粒子としてスパイク状の突起を
有する粒子を用いているので、繊維状の導電性粒子を混
合した場合に比べ、抵抗値のばらつきが小さくなる。実
施例１では、最大抵抗値である１３０℃以上の温度にお
いても抵抗値の低下はなく、サンプルの熱による変形は
生じていない。(C) Since the particles having spike-shaped protrusions are used as the conductive particles, the variation in the resistance value is smaller than that in the case where the fibrous conductive particles are mixed. In Example 1, the resistance value did not decrease even at a temperature of 130 ° C. or higher, which is the maximum resistance value, and the sample was not deformed by heat.
【００２４】従って、上記(a),(b),(c) より、本発明が
目的としているサーミスタを得るには、フィラーである
Ｎｉパウダーの添加量は、５乃至６５重量％好ましくは
２０乃至５５重量％が適していると思われる。Therefore, from the above (a), (b) and (c), in order to obtain the thermistor aimed at by the present invention, the addition amount of Ni powder as a filler is 5 to 65% by weight, preferably 20 to 65% by weight. 55% by weight seems suitable.
【００２５】(d) 導電性粒子と混合する樹脂として熱硬
化性樹脂を用いているので、不燃性であり、熱可塑性樹
脂を用いた場合に比べ、熱可塑性樹脂の場合ではＮＴＣ
現象を抑えるために必要不可欠であった架橋処理が不要
となる。また、架橋処理が不要となり、サーミスタのシ
ート化及び電極付けを一体的に行えるので、熱可塑性樹
脂の場合に比べ、製造工程を簡略化できる等の優れた効
果が得られる。(D) Since a thermosetting resin is used as a resin to be mixed with the conductive particles, it is nonflammable, and compared with the case where a thermoplastic resin is used, it is NTC in the case of a thermoplastic resin.
The cross-linking treatment, which was indispensable for suppressing the phenomenon, is no longer necessary. Further, since the cross-linking treatment is not required and the thermistor can be formed into a sheet and the electrode can be integrally attached, excellent effects such as simplification of the manufacturing process can be obtained as compared with the case of the thermoplastic resin.
【００２６】なお、本発明は上記実施例に限定されず、
その要旨を変更しない範囲内で種々に変形実施できる。The present invention is not limited to the above embodiment,
Various modifications can be made without departing from the spirit of the invention.
【００２７】[0027]
【発明の効果】以上詳述した請求項１記載の発明によれ
ば、導電性粒子としてスパイク状の突起を有する粒子を
用いているので、真球状の導電性粒子を混合した場合に
比べ、スパイク状の突起を有する導電性粒子同士では、
その形状故にトンネル電流が流れやすくなって、導電性
が良好となるため、室温での初期抵抗値が小さくなる。
また、導電性粒子同士の間隔が球状のものに比べて大き
いので、接触点で容易に切れてＰＴＣ特性の立ち上がり
が急峻で大きな抵抗値変化を呈する。また、繊維状の導
電性粒子を混合した場合に比べ、抵抗値のばらつきが小
さくなる。更に、導電性粒子と混合する樹脂として熱硬
化性樹脂を用いているので、熱可塑性樹脂を用いた場合
に比べ、不燃性が向上し、架橋処理が不要となり、製造
工程の簡略化等が図れる。従って、室温での初期抵抗値
が小さく、ＰＴＣ特性の立ち上がりが急峻で大きな抵抗
値変化を呈し、しかも抵抗値のばらつきが小さい等の優
れた効果を有する有機質正特性サーミスタを提供するこ
とができる。According to the invention described in claim 1 described above in detail, since the particles having the spike-shaped projections are used as the conductive particles, the spikes are larger than the case where the spherical conductive particles are mixed. Between the conductive particles having a protrusion
Because of the shape, the tunnel current easily flows and the conductivity becomes good, so that the initial resistance value at room temperature becomes small.
Further, since the distance between the conductive particles is larger than that of the spherical particles, the conductive particles are easily broken at the contact point, the PTC characteristic rises sharply, and a large change in resistance value is exhibited. Further, the variation in resistance value is smaller than that in the case where fibrous conductive particles are mixed. Furthermore, since a thermosetting resin is used as the resin mixed with the conductive particles, compared to the case where a thermoplastic resin is used, the incombustibility is improved, the cross-linking treatment is unnecessary, and the manufacturing process can be simplified. .. Therefore, it is possible to provide an organic positive temperature coefficient thermistor having excellent effects such as a small initial resistance value at room temperature, a sharp rise of PTC characteristics and a large resistance change, and a small variation in resistance value.
【００２８】また、請求項２記載の発明によれば、導電
性粒子の含有量を５乃至６５重量％としているので、導
電性粒子をスパイク状の突起を有する粒子としたことに
よる請求項１記載の効果がより顕著となるので、請求項
１記載の発明よりも室温での初期抵抗値が小さく、ＰＴ
Ｃ特性の立ち上がりが急峻で大きな抵抗値変化を呈し、
しかも抵抗値のばらつきが小さい等の優れた効果を有す
る有機質正特性サーミスタを提供することができる。According to the second aspect of the invention, since the content of the conductive particles is 5 to 65% by weight, the conductive particles are particles having spike-like protrusions. Since the effect of is more remarkable, the initial resistance value at room temperature is smaller than that of the invention of claim 1, and PT
The rising of the C characteristic is steep and a large change in resistance value is exhibited.
Moreover, it is possible to provide an organic positive temperature coefficient thermistor having an excellent effect such as a small variation in resistance value.
【図１】本発明の有機質正特性サーミスタの実施例１の
抵抗温度特性を示すグラフである。FIG. 1 is a graph showing resistance temperature characteristics of Example 1 of the organic positive temperature coefficient thermistor of the present invention.
【図２】本発明の有機質正特性サーミスタの実施例２の
抵抗温度特性を示すグラフである。FIG. 2 is a graph showing resistance temperature characteristics of Example 2 of the organic positive temperature coefficient thermistor of the present invention.
【図３】本発明の有機質正特性サーミスタの実施例３の
抵抗温度特性を示すグラフである。FIG. 3 is a graph showing resistance temperature characteristics of Example 3 of the organic positive temperature coefficient thermistor of the present invention.
【図４】本発明の有機質正特性サーミスタの実施例４の
抵抗温度特性を示すグラフである。FIG. 4 is a graph showing resistance temperature characteristics of Example 4 of the organic positive temperature coefficient thermistor of the present invention.
【図５】有機質正特性サーミスタの比較例１の抵抗温度
特性を示すグラフである。FIG. 5 is a graph showing resistance temperature characteristics of Comparative Example 1 of the organic positive temperature coefficient thermistor.
【図６】有機質正特性サーミスタの比較例２の抵抗温度
特性を示すグラフである。FIG. 6 is a graph showing resistance temperature characteristics of Comparative Example 2 of the organic positive temperature coefficient thermistor.
Claims (2)
る導電性粒子とを混合してなることを特徴とする有機質
正特性サーミスタ。1. An organic positive temperature coefficient thermistor comprising a mixture of a thermosetting resin and conductive particles having spike-like protrusions.
量％とする請求項１記載の有機質正特性サーミスタ。2. The organic positive temperature coefficient thermistor according to claim 1, wherein the content of the conductive particles is 5 to 65% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04007544A JP3101047B2 (en) | 1992-01-20 | 1992-01-20 | Organic positive temperature coefficient thermistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04007544A JP3101047B2 (en) | 1992-01-20 | 1992-01-20 | Organic positive temperature coefficient thermistor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05198403A true JPH05198403A (en) | 1993-08-06 |
| JP3101047B2 JP3101047B2 (en) | 2000-10-23 |
Family
ID=11668739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04007544A Expired - Fee Related JP3101047B2 (en) | 1992-01-20 | 1992-01-20 | Organic positive temperature coefficient thermistor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3101047B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6452476B1 (en) | 1999-01-28 | 2002-09-17 | Tdk Corporation | Organic positive temperature coefficient thermistor |
| EP1612811A1 (en) * | 2004-06-29 | 2006-01-04 | TDK Corporation | Resin composition for forming a thermistor body, and thermistor |
| US7314583B2 (en) | 2003-03-25 | 2008-01-01 | Tdk Corporation | Organic positive temperature coefficient thermistor device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200609953A (en) | 2004-03-31 | 2006-03-16 | Tdk Corp | Organic positive temperature coefficient thermistor |
-
1992
- 1992-01-20 JP JP04007544A patent/JP3101047B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6452476B1 (en) | 1999-01-28 | 2002-09-17 | Tdk Corporation | Organic positive temperature coefficient thermistor |
| US7314583B2 (en) | 2003-03-25 | 2008-01-01 | Tdk Corporation | Organic positive temperature coefficient thermistor device |
| EP1612811A1 (en) * | 2004-06-29 | 2006-01-04 | TDK Corporation | Resin composition for forming a thermistor body, and thermistor |
| US7270776B2 (en) | 2004-06-29 | 2007-09-18 | Tdk Corporation | Resin composition for forming thermistor body, and thermistor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3101047B2 (en) | 2000-10-23 |
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