JPH02257602A - Organic positive temperature coefficient thermistor - Google Patents
Organic positive temperature coefficient thermistorInfo
- Publication number
- JPH02257602A JPH02257602A JP7988689A JP7988689A JPH02257602A JP H02257602 A JPH02257602 A JP H02257602A JP 7988689 A JP7988689 A JP 7988689A JP 7988689 A JP7988689 A JP 7988689A JP H02257602 A JPH02257602 A JP H02257602A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- insulating resin
- electrode
- resin layer
- electrodes
- 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
- 229920005989 resin Polymers 0.000 claims abstract description 31
- 239000011347 resin Substances 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 5
- 229920000620 organic polymer Polymers 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims abstract description 5
- 239000002861 polymer material Substances 0.000 claims abstract description 5
- 230000001747 exhibiting effect Effects 0.000 claims description 3
- 230000008646 thermal stress Effects 0.000 abstract description 12
- 230000035882 stress Effects 0.000 abstract description 8
- 238000005336 cracking Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011888 foil Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 244000126211 Hericium coralloides Species 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、例えば面状発熱体として用いられているシー
ト状の有機正特性サーミスタに関し、特に、樹脂シート
主面に形成される電極及び電橋被覆構造が改良されたも
のに関する。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a sheet-shaped organic positive temperature coefficient thermistor used as a planar heating element, and in particular to an electrode and an electric current formed on the main surface of a resin sheet. This relates to an improved bridge covering structure.
面状発熱体として、シート状の有機正特性サーミスタが
従来より用いられている。この種の有機正特性サーミス
タは、有機高分子材料中に導電性粒子を分散させてなる
シートを用いて構成されている。シートの上面には、互
いに間挿し合う複数本の１ｉｔｉ指を有する１対のくし
歯電極が形成されている。このくし歯電極は、通常、Ａ
ｇペーストのような導電性ペースト、あるいは金属箔に
より構成されている。また、短絡防止並びに耐湿性向上
のために、くし歯電極の形成された領域を覆うように、
絶縁性樹脂フィルムがシートの上面に貼付けられている
。A sheet-shaped organic positive temperature coefficient thermistor has conventionally been used as a sheet-shaped heating element. This type of organic positive temperature coefficient thermistor is constructed using a sheet made of an organic polymer material with conductive particles dispersed therein. A pair of comb-shaped electrodes each having a plurality of interdigitated fingers are formed on the upper surface of the sheet. This comb-shaped electrode is usually A
It is made of conductive paste such as g-paste or metal foil. In addition, in order to prevent short circuits and improve moisture resistance, the area where the comb-shaped electrodes are formed is covered.
An insulating resin film is attached to the top surface of the sheet.
〔発明が解決しようとする技術的課題］有機正特性サー
ミスタでは、高分子材料を主体とするシートを用いて構
成されているので、耐熱性に限界がある。従って、くし
歯電極の形成に際しては、十分に焼付けを行うことがで
きない。よって、−船釣に、くし歯電極のシートへの密
着強度が低く、有機正特性サーミスタ自身の発熱あるい
は高温環境下における熱ストレスを受げた場合、シート
と絶縁性樹脂フィルムとの熱膨張率差による歪みにより
、電極が剥離したり、甚だしき場合には電極に亀裂が生
じ、断線するという問題があった。[Technical Problems to be Solved by the Invention] Organic positive temperature coefficient thermistors are constructed using sheets mainly made of polymeric materials, and therefore have a limited heat resistance. Therefore, when forming a comb-shaped electrode, sufficient baking cannot be performed. Therefore, when fishing on a boat, if the adhesion strength of the comb-shaped electrode to the sheet is low and the organic PTC thermistor itself generates heat or is subjected to thermal stress in a high-temperature environment, the difference in thermal expansion coefficient between the sheet and the insulating resin film may occur. Due to the distortion caused by this, the electrodes may peel off or, in extreme cases, cracks may occur in the electrodes, resulting in disconnection.
よって、本発明の目的は、熱ストレスを受けたとしても
電極の剥離や亀裂が生じ難い構造を備えた有機正特性サ
ーミスタを従供することにある。Therefore, an object of the present invention is to provide an organic positive temperature coefficient thermistor having a structure in which electrodes are unlikely to peel or crack even when subjected to thermal stress.
本発明の有機正特性サーミスタは、有機高分子材料に導
電性粒子を分散さセ・た正の抵抗温度特性を示す材料よ
りなるシートと、このシートの少なくとも一方主面上に
形成された電極と、該電極の少なくとも一部を被覆する
ように形成された絶縁性樹脂層とを備えるものにおいて
、
上記電極に貫通孔が形成されており、該貫通孔内におい
て絶縁性樹脂層が上記シートと密着されていることを特
徴とする。The organic positive temperature coefficient thermistor of the present invention comprises a sheet made of a material exhibiting positive resistance-temperature characteristics in which conductive particles are dispersed in an organic polymer material, and an electrode formed on at least one main surface of the sheet. , an insulating resin layer formed to cover at least a portion of the electrode, wherein a through hole is formed in the electrode, and the insulating resin layer is in close contact with the sheet within the through hole. It is characterized by being
絶縁層とシートとの密着部分が、電極の周囲の領域に加
えて、電極内の貫通孔部分にも形成される。従って、電
極が形成されている部分において、熱ストレスを受けた
場合の絶縁性樹脂層からの物理的ストレスが、貫通孔内
で絶縁性樹脂層が密着しているシート部分に逃がされる
。よって、電極の受けるストレスが緩和され、熱ストレ
スに起因する電極剥離及び亀裂を防止することができる
。A close contact portion between the insulating layer and the sheet is formed not only in the area around the electrode but also in the through hole portion within the electrode. Therefore, physical stress from the insulating resin layer when subjected to thermal stress in the portion where the electrode is formed is released to the sheet portion to which the insulating resin layer is in close contact within the through hole. Therefore, the stress applied to the electrodes is alleviated, and electrode peeling and cracking caused by thermal stress can be prevented.
第２図は、本発明の一実施例が適用される有機正特性サ
ーミスタの平面図である。この有機正特性サーミスタ１
は、シート２上に後述するくし歯電極３３４を形成する
ことにより構成されている。FIG. 2 is a plan view of an organic positive temperature coefficient thermistor to which an embodiment of the present invention is applied. This organic positive temperature coefficient thermistor 1
is constructed by forming comb-shaped electrodes 334, which will be described later, on the sheet 2.
シート２は、ポリエチレン等のポリオレフィン樹脂のよ
うな有機高分子材料に、カーボンブランクやカーボン・
グラファイトのような導電性粒子を分散させ混練した後
成形することにより構成されている。シート２の一方主
面上には、くし歯電極３，４が形成されている。＜シ歯
電極３．４は、シート２の対向している長辺に沿うよう
に配置された給電部３ａ、４ａと、給電部３ａ、４ａか
ら他方の給電部側に延びる？ｊ！数本の電極指３ｈ、４
ｂを有する。複数本の電極指３ｂ、４ｂば、互いに間挿
し合うように配置されている。Sheet 2 is made of an organic polymer material such as polyolefin resin such as polyethylene, and carbon blank or carbon fiber.
It is constructed by dispersing conductive particles such as graphite, kneading, and then molding. On one main surface of the sheet 2, comb-shaped electrodes 3 and 4 are formed. <The toothed electrodes 3.4 extend from the power feeding portions 3a, 4a arranged along the opposing long sides of the sheet 2 toward the other power feeding portion. j! Several electrode fingers 3h, 4
It has b. The plurality of electrode fingers 3b, 4b are arranged so as to be intercalated with each other.
上記したくし歯電極３，４は、導電ペーストを塗布・硬
化させることにより、あるいは金属箔を貼付けることに
より形成されている。The comb-tooth electrodes 3 and 4 described above are formed by applying and curing a conductive paste or by pasting metal foil.
本実施例の特徴は、上述したくし歯電極３，４の電極指
３ｂ、４ｂに、第１図に拡大して示すように、複数個の
貫通孔１０が形成されていることにある。複数個の貫通
孔１０は、後述する絶縁性樹脂層をシートに効果的に密
着させるために形成されている。従って、貫通孔ｌＯは
、絶縁性樹脂層で被覆される電極部分に形成されており
さえすればよい、もっとも、絶縁性樹脂層で被覆されて
いる領域においては、複数個の貫通孔１０はほぼ均等に
分散形成されていることが好ましい。The feature of this embodiment is that a plurality of through holes 10 are formed in the electrode fingers 3b and 4b of the comb-like electrodes 3 and 4, as shown in an enlarged view in FIG. 1. The plurality of through holes 10 are formed to effectively adhere an insulating resin layer, which will be described later, to the sheet. Therefore, the through holes 10 only need to be formed in the electrode portion covered with the insulating resin layer. However, in the area covered with the insulating resin layer, the plurality of through holes 10 are approximately It is preferable that they are evenly distributed.
第２図に戻り、絶縁性樹脂層５が、シート２の上面にお
いて、電極３．４の電極指３ｂ、４ｂ並びに給電部３ａ
、４ａの一部を被覆するように配置されている。絶縁性
樹脂１ｉ１５は、絶縁性樹脂フィルム又は絶縁性樹脂コ
ーティングにより形成されている。Returning to FIG. 2, the insulating resin layer 5 covers the electrode fingers 3b, 4b of the electrodes 3.4 and the power supply part 3a on the upper surface of the sheet 2.
, 4a. The insulating resin 1i15 is formed of an insulating resin film or an insulating resin coating.
第１図の■−■線に沿う部分に相当する電極指部分を拡
大して示す第３図から明らかなように、絶縁性樹脂層５
は、電極指３ｂに設けられた貫通孔１０内において、シ
ート２に直接密着されている。よって、本実施例では、
絶縁性樹脂層５は、電極３，４の周囲の領域でシート２
に密着されているだけでなく、電極３．４の上面であっ
ても貫通孔ｌＯ内においてシート２に直接密着されてい
る。従って、熱ストレスを受けたとしても、絶縁性樹脂
層５からの物理的ストレスは、該貫通孔内の領域におい
てシート２に逃がされる。As is clear from FIG. 3, which shows an enlarged view of the electrode finger portion corresponding to the portion along the line ■-■ in FIG. 1, the insulating resin layer 5
is in direct contact with the sheet 2 in the through hole 10 provided in the electrode finger 3b. Therefore, in this example,
The insulating resin layer 5 covers the sheet 2 in the area around the electrodes 3 and 4.
In addition to being in close contact with the sheet 2, the upper surface of the electrode 3.4 is also in direct contact with the sheet 2 within the through hole IO. Therefore, even if thermal stress is applied, the physical stress from the insulating resin layer 5 is released to the sheet 2 in the area inside the through hole.
他方、従来構造では、第４図に拡大して示すように、電
極指１３ｂが形成されている部分では、絶縁性樹脂Ｎ５
はシート２とは電極指１３ｂを介して隔てられている。On the other hand, in the conventional structure, as shown in an enlarged view in FIG.
is separated from the sheet 2 via an electrode finger 13b.
よって、熱ストレスが絶縁性樹脂Ｎ５に加えられた場合
、該熱ストレスの全てが電極指１３ｂに直接加わるため
、前述したとおり、電極１３の剥離や亀裂が発生してい
た。Therefore, when thermal stress is applied to the insulating resin N5, all of the thermal stress is directly applied to the electrode fingers 13b, causing peeling and cracking of the electrodes 13 as described above.
これに対して、本実施例では、第３図に示したとおり、
貫通孔ＩＯ内において絶縁性樹脂Ｎ５がシート２に密着
しているので、熱ストレスに起因する絶縁性樹脂Ｎ５か
らの物理的ストレスが緩和され、従って電極指３ｂの剥
離や亀裂の生じ難いことがわかる。On the other hand, in this embodiment, as shown in FIG.
Since the insulating resin N5 is in close contact with the sheet 2 in the through-hole IO, the physical stress from the insulating resin N5 caused by thermal stress is alleviated, and therefore the electrode fingers 3b are less likely to peel off or crack. Recognize.
なお、貫通孔ＩＯは、第１図に示した円形のものに限ら
ず、種々の形状に形成することができる。Note that the through hole IO is not limited to the circular shape shown in FIG. 1, but can be formed in various shapes.
例えば、第５図（ａ）に示すように、平面形状が矩形の
貫通孔１０ａを形成してもよい。また、第５図（ｂ）に
示すように、１本の電極指３ｂ当たりに１本の貫通孔１
０ｂのみを形成してもよい。For example, as shown in FIG. 5(a), a through hole 10a having a rectangular planar shape may be formed. Further, as shown in FIG. 5(b), one through hole 1 is provided per one electrode finger 3b.
Only 0b may be formed.
さらに、第５図（Ｃ）に示すように、長手方向が電極指
３ｂの延びる方向に形成され、かつ互いに平行に配置さ
れた複数本の貫通孔１０ｃを形成してもよい。Furthermore, as shown in FIG. 5(C), a plurality of through holes 10c may be formed, the longitudinal direction of which is formed in the direction in which the electrode fingers 3b extend, and which are arranged parallel to each other.
同様に、本発明は、第２図に示したようなくし歯電極３
．４を有する有機正特性サーミスタに限らず、他の電極
構造を有する有機正特性サーミスタにも適用することが
でき、要するに、電極の表面が絶縁性樹脂層で被覆され
た構造を有する有機正特性サーミスタ一般に適用するこ
とができる。Similarly, the present invention provides a comb-like electrode 3 as shown in FIG.
．． It can be applied not only to the organic positive temperature coefficient thermistor having 4, but also to organic positive temperature coefficient thermistors having other electrode structures.In short, the organic positive temperature coefficient thermistor has a structure in which the surface of the electrode is covered with an insulating resin layer. Can be generally applied.
以上のように、本発明によれば、電極に設けられた貫通
孔内において絶縁性樹脂層が正の抵抗温度特性を示す材
料よりなるシートに密着されているので、有機正特性サ
ーミスタの自己発熱や高温環境下での使用に際して熱ス
トレスが加えられたとしても、絶縁性樹脂層から電極へ
の物理的ストレスが緩和され、電極のシートからの剥離
や亀裂・断線を効果的に防止することができる。従って
、本発明の有機正特性サーミスタを用いれば、故障の少
ない信転性に優れた面状発熱体を得ることが可能となる
。As described above, according to the present invention, the insulating resin layer is in close contact with the sheet made of a material exhibiting positive resistance-temperature characteristics within the through-hole provided in the electrode, so that the organic positive temperature coefficient thermistor self-generates heat. Even if thermal stress is applied when used in high-temperature environments, the physical stress from the insulating resin layer to the electrode is alleviated, effectively preventing the electrode from peeling off from the sheet, cracking, or disconnecting. can. Therefore, by using the organic positive temperature coefficient thermistor of the present invention, it is possible to obtain a planar heating element with excellent reliability and less failure.
第１図は本発明の一実施例の有機正特性サーミスタにお
ける電極形状を拡大して示す部分切欠平面図、第２図は
本発明の一実施例が適用される有機正特性サーミスタの
平面図、第３図は本発明の一実施例における貫通孔及び
絶縁層の関係を説明するための部分切欠断面図、第４図
は従来例における絶縁層と電極との関係を説明するため
の断面図、第５図（ａ）〜（Ｃ）は、それぞれ、貫通孔
の他の形状を説明するための部分切欠平面図である。
図において、■は有機正特性サーミスタ、２はシート、
３．４は電極、３ｂ、４ｂは電極指、５は絶縁性樹脂層
、１０は貫通孔を示す。
第２図
ヰαFIG. 1 is a partially cutaway plan view showing an enlarged electrode shape of an organic positive temperature coefficient thermistor according to an embodiment of the present invention, and FIG. 2 is a plan view of an organic positive temperature coefficient thermistor to which an embodiment of the present invention is applied. FIG. 3 is a partially cutaway sectional view for explaining the relationship between a through hole and an insulating layer in an embodiment of the present invention, and FIG. 4 is a sectional view for explaining the relationship between an insulating layer and an electrode in a conventional example. FIGS. 5A to 5C are partially cutaway plan views for explaining other shapes of the through hole. In the figure, ■ is an organic positive temperature coefficient thermistor, 2 is a sheet,
3.4 is an electrode, 3b and 4b are electrode fingers, 5 is an insulating resin layer, and 10 is a through hole. Figure 2 α
Claims (1)
特性を示す材料よりなるシートと、前記シートの少なく
とも一方主面上に形成された電極と、 前記電極の少なくとも一部を覆うように形成された絶縁
性樹脂層とを備える有機正特性サーミスタにおいて、 前記電極に複数個の貫通孔が形成されており、該貫通孔
内で、前記絶縁性樹脂層が前記シートの表面に密着され
ていることを特徴とする有機正特性サーミスタ。[Scope of Claims] A sheet made of a material exhibiting positive resistance-temperature characteristics in which conductive particles are dispersed in an organic polymer material, an electrode formed on at least one principal surface of the sheet, and at least one of the electrodes. An organic positive temperature coefficient thermistor comprising an insulating resin layer formed to cover a portion of the organic positive temperature coefficient thermistor, wherein a plurality of through holes are formed in the electrode, and in the through holes, the insulating resin layer is connected to the sheet. An organic positive temperature coefficient thermistor characterized in that it is in close contact with the surface of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7988689A JPH02257602A (en) | 1989-03-29 | 1989-03-29 | Organic positive temperature coefficient thermistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7988689A JPH02257602A (en) | 1989-03-29 | 1989-03-29 | Organic positive temperature coefficient thermistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02257602A true JPH02257602A (en) | 1990-10-18 |
Family
ID=13702744
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7988689A Pending JPH02257602A (en) | 1989-03-29 | 1989-03-29 | Organic positive temperature coefficient thermistor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02257602A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003109804A (en) * | 2001-09-28 | 2003-04-11 | Matsushita Electric Ind Co Ltd | Flexible ptc heating element |
-
1989
- 1989-03-29 JP JP7988689A patent/JPH02257602A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003109804A (en) * | 2001-09-28 | 2003-04-11 | Matsushita Electric Ind Co Ltd | Flexible ptc heating element |
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