JPH02129883A - Heating body - Google Patents
Heating bodyInfo
- Publication number
- JPH02129883A JPH02129883A JP63282777A JP28277788A JPH02129883A JP H02129883 A JPH02129883 A JP H02129883A JP 63282777 A JP63282777 A JP 63282777A JP 28277788 A JP28277788 A JP 28277788A JP H02129883 A JPH02129883 A JP H02129883A
- Authority
- JP
- Japan
- Prior art keywords
- boundary
- terminal
- heating element
- boundary portion
- protective film
- 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.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 36
- 230000001681 protective effect Effects 0.000 claims abstract description 20
- 238000005485 electric heating Methods 0.000 claims abstract description 16
- 238000013459 approach Methods 0.000 abstract description 9
- 230000003247 decreasing effect Effects 0.000 abstract description 4
- 230000007423 decrease Effects 0.000 abstract description 3
- 239000000919 ceramic Substances 0.000 description 8
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 7
- 239000004332 silver Substances 0.000 description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 6
- 229910052709 silver Inorganic materials 0.000 description 5
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 229910052863 mullite Inorganic materials 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 229910001252 Pd alloy Inorganic materials 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910001316 Ag alloy Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 206010037660 Pyrexia Diseases 0.000 description 1
- 230000002730 additional effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- SWELZOZIOHGSPA-UHFFFAOYSA-N palladium silver Chemical compound [Pd].[Ag] SWELZOZIOHGSPA-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Resistance Heating (AREA)
- Electronic Switches (AREA)
- Fixing For Electrophotography (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
- Surface Heating Bodies (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は基体上に電気発熱体を設けた加熱体において、
発熱部と端子部との境界部の断線を防止したもので、特
に大出力の加熱体に適する。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a heating element having an electric heating element provided on a base,
This prevents disconnection at the boundary between the heat generating part and the terminal part, and is particularly suitable for high output heating elements.
（従来の技Ｉり
近年、事務用機器（ＯＡ機器）において接触形の加熱体
が用いられている。たとえばファクシミリにおいて、長
形加熱体に接触しながら進行する感熱紙に連続打点して
パターンを形成し、あるいは複写機において、パターン
をなすトナー像を転写した複写紙を長形加熱体に接触さ
せて定着するなど多くの用途がある。(Conventional Techniques) In recent years, contact-type heating elements have been used in office equipment (OA equipment). For example, in facsimiles, patterns are created by continuously dotting thermal paper that moves while contacting a long heating element. It has many uses, such as forming or fixing a patterned toner image on copy paper by contacting it with a long heating element in a copying machine.
このような加熱体はアルミナセラミクスなどからなる細
長い板状基体表面に金属たとえば銀・パラジウム合金か
らなり、細長い発熱部の両端に幅広の端子部を形成した
電気発熱体を設け、かつ発熱部表面をガラス質の保護膜
で被覆しである。Such a heating body has an electric heating element made of a metal such as a silver-palladium alloy on the surface of a long and thin plate-like base made of alumina ceramics, etc., and has wide terminals formed at both ends of the elongated heat-generating part, and the surface of the heat-generating part is It is coated with a glassy protective film.
（発明が解決しようとする課題）
このような従来の加熱体を大出力で反覆使用すると、発
熱部と端子部との境界部で加熱体が断線するものがしば
しば発生した。そこで、この断線した加熱体を調査した
ところ、発熱部と端子部との境界部まで強く発熱するよ
うになっており、動作中発熱部は端部まで、高温に熱せ
られ、これに対し端子部が常温に近い低温になっており
、この温度差と断線との間に何んらかの関係があるもの
と推測された。(Problems to be Solved by the Invention) When such a conventional heating element is used repeatedly at high output, the heating element often breaks at the boundary between the heat generating part and the terminal part. When we investigated this disconnected heating element, we found that it generates strong heat even to the boundary between the heat generating part and the terminal part.During operation, the heat generating part is heated to a high temperature all the way to the end; It was assumed that there was some kind of relationship between this temperature difference and the disconnection.
そこで、本発明の課題は断線の原因を解明してその原因
を除去し、大出力で反覆使用しても断線の少ない加熱体
を提供することである。Therefore, an object of the present invention is to clarify the cause of wire breakage, eliminate the cause, and provide a heating element with less wire breakage even when used repeatedly at high output.
（課題を解決するための手段）
本発明は基体上に細長い発熱部の端部に幅広の端子部を
形成してなる電気発熱体を設けた加熱体において発熱部
と端子部との境界部の断線を少なくしたもので、請求項
の第１は境界部を端子部に近ずくほど順次長手方向の抵
抗値が小さくなるように構成して境界部における温度勾
配を緩和したものであり、請求項の第２は境界部の表面
をガラス質保護膜で被覆して発熱部端部の熱を保護膜を
介して端子部に逃がし、境界部の温度勾配を緩和したも
のである。(Means for Solving the Problems) The present invention provides a heating element having an electric heating element formed by forming a wide terminal part at the end of an elongated heating part on a base body. The first aspect of the present invention is to reduce the temperature gradient at the boundary by configuring the boundary so that the resistance value in the longitudinal direction becomes smaller as the boundary gets closer to the terminal. In the second method, the surface of the boundary portion is covered with a glass protective film, and the heat at the end of the heat generating portion is released to the terminal portion through the protective film, thereby alleviating the temperature gradient at the boundary portion.
（作 用）
本発明者らは多くの調査と研究の結果、電気発熱体の境
界部における温度勾配と断線との間に重大な関係があり
、温度勾配が大きいほど断線の発生率が大きいことを発
見した。この事実は高出方加熱体のように発熱部温度の
高い場合に大きな問題となることも同時に発見した。そ
こで、温度勾配を小さくする方法を種々研究した結果、
上述のとおり境界部の電気抵抗を端子部に近ずくに従っ
て小さくすることによって発熱量が順次小さくなるよう
にして目的を達成した。また、境界部をガラス質保護膜
で被覆することによって、境界部に熱的バイパスを形成
させて伝熱を良好にして目的を達成した。(Function) As a result of many investigations and studies, the present inventors have found that there is a significant relationship between the temperature gradient at the boundary of the electric heating element and wire breakage, and the larger the temperature gradient, the higher the occurrence rate of wire breakage. discovered. At the same time, we discovered that this fact becomes a big problem when the temperature of the heat generating part is high, such as in a high output heating element. Therefore, as a result of researching various methods to reduce the temperature gradient,
As mentioned above, the objective was achieved by decreasing the electric resistance of the boundary portion as it approaches the terminal portion, thereby gradually decreasing the amount of heat generated. Furthermore, by covering the boundary with a glassy protective film, a thermal bypass was formed at the boundary to improve heat transfer, thereby achieving the objective.
（実施例）
まず、第１の発明を第１図ないし第３図に示す第１の実
施例によって説明する。（１）は基体、（２）はこの基
体（１）上に設けられた電気発熱体、（３）は保護膜で
ある。上記基体（１）はムライトセラミクスからなり、
長さ３００ｍｍ、幅１０ｍｍ、厚さ１〜２ｍｍの細長い
平板をなす。上記ムライトはＡＱ２０３・２Ｓｉ０２な
る化学組成を有し、セラミクスとガラスとの中間的性質
を有し、熱伝導率が約３Ｋｃａｌ／ｍｈ℃でアルミナセ
ラミクスの約半分で、加工が容易で、機械的強度も充分
である。そうして、基体（１）の上面は約数μ程度の凹
凸面（１１）に形成されている。(Example) First, the first invention will be explained with reference to a first example shown in FIGS. 1 to 3. (1) is a base, (2) is an electric heating element provided on this base (1), and (3) is a protective film. The base (1) is made of mullite ceramics,
It forms an elongated flat plate with a length of 300 mm, a width of 10 mm, and a thickness of 1 to 2 mm. The above mullite has a chemical composition of AQ203.2Si02, has intermediate properties between ceramics and glass, has a thermal conductivity of about 3 Kcal/mh°C, about half that of alumina ceramics, is easy to process, and has mechanical strength. is also sufficient. Thus, the upper surface of the base body (1) is formed with an uneven surface (11) of approximately several μm.
上記電気発熱体（２）はたとえば銀・パラジウム合金粉
末を基体（１）の凹凸面（１１）にプリントして焼付け
てなるもので、中央部が細長い発熱部（２１）で、この
発熱部（２１）の両端に境界部（２２）、 （２２）を
介して幅広の端子部（２３）、 （２３）を形成し、か
つ端子部（２３）、 （２３）の表面に銀膜（２４）、
（２４）を焼付は形成してあり、かつ発熱部（２１）
表面に保護膜（３）を形成しである。The electric heating element (2) is made by printing and baking, for example, silver/palladium alloy powder on the uneven surface (11) of the base (1), and has an elongated heating part (21) in the center; Wide terminal parts (23), (23) are formed at both ends of the terminal parts (22), (22) via the boundary parts (22), (22), and a silver film (24) is formed on the surface of the terminal parts (23), (23). ,
(24) is formed by baking, and the heat generating part (21)
A protective film (3) is formed on the surface.
ちなみに、電気発熱体（２）の各部寸法を例示すれば、
発熱部（２１）の長さ 約２７０ ｍｍ発熱部（
２１）の中央部幅 約２．５〜３．０ ｍｍ発熱部（
２１）の両端部幅 約１．５ ｍｍ境界部（２２）の
長さ 約８〜１０ ｍｍ端子部（２３）の長さ
約５ ｍｍ端子部（２３）の＠ １０
ｍｍ各部（２１）、 （２２）、 （２３）の厚さはほ
ぼ一様に１０μ、しかして、本実施例の特徴は境界部（
２２）の幅が端子部（２３）に近ずくに従って順次幅広
になってほぼ扇形に形成され、この結果境界部（２２）
は端子部（２３）に近ずくに従って順次長手方向の電気
抵抗が小さくなっていることである。By the way, to give an example of the dimensions of each part of the electric heating element (2), the length of the heating part (21) is approximately 270 mm.
21) The width of the central part of the heating part (approximately 2.5 to 3.0 mm)
Width at both ends of 21) Approximately 1.5 mm Length of boundary portion (22) Approximately 8 to 10 mm Length of terminal portion (23)
Approximately 5 mm terminal part (23) @ 10
The thickness of each part (21), (22), (23) is almost uniformly 10 μm, and the feature of this embodiment is that the boundary part (
The width of the boundary portion (22) becomes wider as it approaches the terminal portion (23) and is formed into a substantially fan shape.
The electrical resistance in the longitudinal direction gradually decreases as the terminal portion (23) is approached.
つぎに、本節１の実施例の作用を説明する。両端子部（
２３）、 （２３）間に通電すれば、発熱部（２１）が
その電気抵抗に応じて発熱する。しかし、端子部（２３
）は幅広であり、かつその表面を銀膜（２４）で被覆さ
れているので電気抵抗が小さく、はとんど発熱しない。Next, the operation of the embodiment of Section 1 will be explained. Both terminals (
23) and (23), the heat generating portion (21) generates heat according to its electrical resistance. However, the terminal part (23
) is wide and its surface is coated with a silver film (24), so it has low electrical resistance and hardly generates heat.
しかして、本実施例においては境界部（２２）の電気抵
抗が端子部（２３）に近ずくほど小さいので、発熱量も
端子部（２３）に近ずくほど小さくなり、したがって、
境界部（２２）の温度勾配が極めて小さくなっている。Therefore, in this embodiment, the electric resistance of the boundary portion (22) is smaller as it approaches the terminal portion (23), so the amount of heat generated also becomes smaller as it approaches the terminal portion (23).
The temperature gradient at the boundary (22) is extremely small.
この結果、境界部（２２）の断線が著しく減少した。As a result, disconnections at the boundary (22) were significantly reduced.
また、本実施例において、発熱部（２１）の中央部が両
端部より幅広く形成されているので、両端部が中央部よ
り多く発熱し、これによって端末効果を補って均一な温
度分布が得られる付帯効果がある。また、本実施例にお
いて、基体（１）をムライトで構成したので、熱伝導率
が従来のアルミナセラミクス製基板の半分になり、グレ
ーズ層を設けないにも拘らず、熱損失が少なく、したが
って通電後極めて短時間で使用可能な温度に到達し、即
動性が向上する付帯効果が得られた。さらに本実施例に
おいて、基体（１）に凹凸面（１１）を設けて、この面
（１１）に発熱体（２）を形成したので、発熱体の密着
性が向上し、この理由からも断線が減少した。しかし、
凹凸面（１１）の凹凸が１０μを越えることは好ましく
ないことも同時に判明した。In addition, in this embodiment, since the center part of the heat generating part (21) is formed wider than both ends, more heat is generated at both ends than at the center, thereby compensating for the terminal effect and achieving a uniform temperature distribution. There are collateral effects. In addition, in this example, since the substrate (1) is made of mullite, the thermal conductivity is half that of the conventional alumina ceramic substrate, and even though no glaze layer is provided, there is little heat loss, and therefore there is no current flow. After that, the usable temperature was reached in an extremely short period of time, which had the additional effect of improving quick-acting properties. Furthermore, in this example, since the base (1) is provided with an uneven surface (11) and the heating element (2) is formed on this surface (11), the adhesion of the heating element is improved, and for this reason as well, disconnection occurs. decreased. but,
At the same time, it was found that it is not preferable that the unevenness of the uneven surface (11) exceeds 10μ.
つぎに、本実施例加熱体について断線試験を行なった。Next, a disconnection test was conducted on the heating element of this example.
試験はパルス通電とし、パルスの条件は１４０Ｖ、 ５
０Ｈｚとシテ全体テ４００Ｗ相当の電流を１時間通電し
、断線数を調査した。また、比較のため、従来の境界部
がほとんどなく、発熱部の端部の細い部分が直接幅広の
端子部に連続しているものを同条件で調査した。この結
果を次表に示す。The test was conducted using pulse current, and the pulse conditions were 140V, 5
A current of 0 Hz and a current equivalent to 400 W was applied to the entire site for 1 hour, and the number of wire breaks was investigated. For comparison, we also investigated a device under the same conditions as the conventional device in which there are almost no boundaries and the thin end portion of the heat generating portion is directly connected to the wide terminal portion. The results are shown in the table below.
この実験結果から、水弟１の実施例のものは従来のもの
に比較して断線が著しく少ないことが明らかである。From the results of this experiment, it is clear that the wire breakage of the Sui-Tei 1 example is significantly less than that of the conventional wire.
つぎに、第２の実施例を第４図ないし第６図に示す第２
の実施例によって説明する。（１）は基体、（４）はこ
の基体（１）前面に積層されたグレーズ層、（２）はこ
のグレーズ層（４）の表面に設けられた電気発熱体、（
３）はこの電気発熱体（２）を被覆したガラス質保護膜
である。上記基体（１）はアルミナセラミクスからなり
、実施例１と同様長さ３００ｍｍ、幅１０ｍｍ、厚さ１
〜２ｍｍの細長い平板をなす。Next, the second embodiment is shown in FIGS. 4 to 6.
This will be explained using an example. (1) is a base, (4) is a glaze layer laminated on the front surface of this base (1), (2) is an electric heating element provided on the surface of this glaze layer (4), (
3) is a vitreous protective film covering this electric heating element (2). The base body (1) is made of alumina ceramics, and has a length of 300 mm, a width of 10 mm, and a thickness of 1 mm, as in Example 1.
It forms an elongated flat plate of ~2 mm.
上記グレーズ層（４）はＰｂＯ−Ｂ２Ｏ３・５ｉｎ２な
る化学組成を有するガラス質薄層で、基体（１）表面に
３０〜１５０μ の厚さで積層されており、熱伝導率が
低い特性を有する。The glaze layer (4) is a glassy thin layer having a chemical composition of PbO-B2O3.5in2, is laminated on the surface of the substrate (1) to a thickness of 30 to 150 microns, and has a characteristic of low thermal conductivity.
上記電気発熱体（２）はたとえば銀・パラジウム合金粉
末をグレーズ層（４）表面にプリントして焼付けてなる
もので、中央部が細長い発熱部（２１）で、この発熱部
（２１）の両端に境界部（２２）、 （２２）を介して
幅広の端子部（２３）、 （２３）を形成し、かつ端子
部（２３）、 （２３）表面に銀膜（２４）、 （２４
）を焼付は形成しである。そうして、発熱部（２１）か
ら境界部（２２） 。The electric heating element (2) is made by printing and baking, for example, silver/palladium alloy powder on the surface of the glaze layer (4), and has an elongated heating part (21) in the center, and both ends of this heating part (21). Wide terminal parts (23), (23) are formed through the boundary parts (22), (22), and silver films (24), (24) are formed on the surfaces of the terminal parts (23), (23).
) is formed. Then, from the heat generating part (21) to the boundary part (22).
（２２）まで連続して基体（１）の幅一杯にガラス質保
護膜（３）を被覆しである。しかして、本実施例の特徴
は電気発熱体（２）の境界部（２２）が保護膜（３）で
被覆されて伝熱のバイパスを構成していることであり、
したがって、境界部（２２）の範囲は発熱部（２１）の
端部から端子部（２３）の一部までを含み、多分に機能
的に表現され、かっこの熱的バイパスの機能を期待する
範囲を総て境界部（２２）と称することが適当である。The glass protective film (3) is continuously coated over the entire width of the substrate (1) up to (22). Therefore, the feature of this embodiment is that the boundary part (22) of the electric heating element (2) is covered with a protective film (3) to constitute a heat transfer bypass.
Therefore, the range of the boundary part (22) includes from the end of the heat generating part (21) to a part of the terminal part (23), and is expressed functionally, and is a range in which the thermal bypass function of the brackets is expected. It is appropriate to refer to all of them as the boundary part (22).
ちなみに、水弟２の実施例においては発熱部（２１）が
１．５〜２．０ｍｍ＠の線状で延在して広幅の端子部（
２３）に連続して、その連接部分まで強く発熱するので
、境界部（２２）は発熱部（２１）側へ８ｍｍ以上、端
子部（２３）側へ２ｍｍ以上取ることが望ましい。By the way, in the embodiment of Sui-Tei 2, the heat-generating part (21) extends in a linear shape of 1.5 to 2.0 mm to form a wide terminal part (
23), the connecting portion also generates strong heat, so it is desirable that the boundary portion (22) be 8 mm or more toward the heat generating portion (21) and 2 mm or more toward the terminal portion (23).
つぎに、水弟２の実施例の作用を説明する。両端子部（
２３）、 （２３）間に通電すれば、発熱部（２１）が
その電気抵抗に応じて発熱する。しかし、端子部（２３
）は幅広であり、かつその表面を銀膜（２４）で被覆さ
れているので電気抵抗が小さくほとんど発熱しない。し
かし、発熱部（２１）は端部まで細く形成されて高抵抗
であり、端子部（２３）との直近の部位（境界部（２２
）に含まれる。）まで強く発熱する。しかし、本実施例
においては境界部（２２）がガラス質保護膜（３）で被
覆されているので、境界部（２２）で発生した熱は境界
部（２２）それ自体とグレーズ層（４）とを伝導するほ
か、保護膜（３）が熱的バイパスを構成して境界部（２
２）の熱を端子部（２３）に逃がし、これによって境界
部（２２）の温度を引き下げるとともに端子部（２３）
の温度を上昇させる。この結果、水弟２の実施例のもの
は境界部（２２）の温度勾配が小さく、境界部（２２）
の断線が著しく減少した。Next, the operation of the embodiment of Sui-Tei 2 will be explained. Both terminals (
23) and (23), the heat generating portion (21) generates heat according to its electrical resistance. However, the terminal part (23
) is wide and its surface is coated with a silver film (24), so it has low electrical resistance and generates almost no heat. However, the heat generating part (21) is formed thin to the end and has high resistance, and the part closest to the terminal part (23) (the boundary part (22)
)include. ) generates a strong fever. However, in this embodiment, since the boundary part (22) is covered with the glassy protective film (3), the heat generated at the boundary part (22) is transferred to the boundary part (22) itself and the glaze layer (4). In addition, the protective film (3) forms a thermal bypass to conduct the boundary (2
2) is released to the terminal part (23), thereby lowering the temperature of the boundary part (22) and reducing the temperature of the terminal part (23).
increase the temperature. As a result, the temperature gradient of the boundary part (22) in the example of Sui-Tei 2 is small;
The number of disconnections has been significantly reduced.
また、水弟２の実施例において、基体（１）の表面にｐ
ｂｏ・Ｂ２Ｏ３・５ｉｎ２組成のガラス質グレーズ層（
４）を設けたので、発熱部（２１）の熱が熱伝導の良い
アルミナセラミクス基体（１）に逃げることが少なく、
したがって熱効率が高く、かつ始動に際し、立上りが速
い利点がある。なお、このブレースＮ（４）の厚さは３
０μ未満ならば効果がなく、また１５０μを越えると断
線が増加して不適当であることも判明した。In addition, in the embodiment of Sui-Tei 2, p
Glassy glaze layer with bo・B2O3・5in2 composition (
4), the heat from the heat generating part (21) is less likely to escape to the alumina ceramic base (1), which has good thermal conductivity.
Therefore, it has the advantage of high thermal efficiency and quick start-up. The thickness of this brace N(4) is 3
It has been found that if it is less than 0μ, there is no effect, and if it exceeds 150μ, wire breakage increases and it is unsuitable.
つぎに、本第２の実施例加熱体について断線試験を行な
った。試験はパルス通電とし、パルスの条件としては１
４０Ｖ、 ５０Ｈｚとして全体で４００Ｗ相当の電流を
１時間通電し、断線を調査した。また、比較のため、従
来の発熱部だけ保護膜を設は境界部には保護膜を設けな
いものを同条件で調査した。Next, a disconnection test was conducted on the heating element of the second example. The test was conducted with pulse energization, and the pulse conditions were 1
A current equivalent to a total of 400 W was applied at 40 V and 50 Hz for 1 hour to check for disconnection. In addition, for comparison, a conventional model in which a protective film was provided only at the heat-generating part, but no protective film was provided at the boundary part, was investigated under the same conditions.
この結果を次表に示す。The results are shown in the table below.
この実験結果から、本第２の実施例のものも従来のもの
に比較して断線が著しく少ないことが明らかである。From this experimental result, it is clear that the second embodiment also has significantly fewer wire breaks than the conventional one.
なお、本発明において、第１の実施例の基体をアルミナ
セラミクスで構成してブレース層を設けてもよく、また
、第２の実施例の基体をムライトセラミクスで構成して
ブレース層を省略してもよい。さらに電気発熱体は上述
の例に限らず、たとえば金属や黒鉛を配合してなる導電
性セラミクスなどで構成してもよい。また、保護膜は形
成が容易で比較的熱伝導の良いものであれば材質を問わ
ない。さらに、基体の形状や大きさは問うところではな
く、また、境界部は幅を調整して抵抗を変化させるほか
、厚さや材質を変えて抵抗を変えてもよい。さらに境界
部の抵抗値は段階的に変化してもよく、また、抵抗値が
増大、減小を繰返しながら次第に小さくなるようにして
もよく、要は端子部に近ずくに従って長手方向の抵抗値
が小さくなればよい。In the present invention, the base of the first embodiment may be made of alumina ceramics and a brace layer may be provided, or the base of the second embodiment may be made of mullite ceramics and the brace layer may be omitted. Good too. Further, the electric heating element is not limited to the above-mentioned example, and may be made of, for example, conductive ceramics containing metal or graphite. Further, the protective film may be made of any material as long as it is easy to form and has relatively good thermal conductivity. Further, the shape and size of the base body are not critical, and the resistance may be changed by adjusting the width of the boundary portion or by changing the thickness or material. Furthermore, the resistance value at the boundary part may change stepwise, or the resistance value may increase and decrease gradually to become smaller.In short, the resistance value in the longitudinal direction increases as it approaches the terminal part. should be smaller.
このように、本発明の加熱体は基体上に設けた細長い発
熱部の端部に境界部を介して端子部を設けたものにおい
て、請求項の第１は境界部を端子部に近ずくに従って長
手方向の抵抗値が小さくなるように構成したものであり
、また請求項の第２は境界部をガラス質保護膜で被覆し
て熱的バイパスを形成したものであり、いずれもこの発
明によって境界部の温度勾配が小さくなって境界部の断
線が大幅に減少した。As described above, in the heating body of the present invention, the terminal portion is provided at the end of the elongated heat-generating portion provided on the base body through the boundary portion, and the first aspect of the present invention provides that the terminal portion is provided as the boundary portion approaches the terminal portion. The structure is configured such that the resistance value in the longitudinal direction is small, and the second claim is that the boundary portion is coated with a glassy protective film to form a thermal bypass. The temperature gradient at the boundary became smaller, and the number of wire breaks at the boundary was significantly reduced.
第１図は本発明の加熱体の第１の実施例の平面図、第２
図は同じく断面図、第３図は同じく要部拡大断面図、第
４図は第２の実施例の平面図、第５図は同じく断面図、
第６図は要部拡大断面図である。
（１）・・・基体 （１１）・・・凹凸面（
２）・・・電気発熱体 （２１）・・・発熱部（２
２）・・・境界部 （２３）・・端子部（２４
）・・・銀膜 （３）・・・保護膜（４）・
・・ブレース層
代理人 弁理士 大 胡 典 夫FIG. 1 is a plan view of the first embodiment of the heating body of the present invention, and FIG.
The figure is a sectional view, FIG. 3 is an enlarged sectional view of the main part, FIG. 4 is a plan view of the second embodiment, and FIG. 5 is a sectional view.
FIG. 6 is an enlarged sectional view of the main part. (1)... Base (11)... Uneven surface (
2)... Electric heating element (21)... Heat generating part (2
2)... Boundary part (23)... Terminal part (24
)...Silver film (3)...Protective film (4)
・Brace layer agent Patent attorney Norio Ogo
Claims (2)
成してなる電気発熱体を設けた加熱体において、上記発
熱部と上記端子部との境界部は上記端子部に近ずくに従
って長手方向の抵抗値が小さくなるように構成したこと
を特徴とする加熱体。(1) In a heating element provided with an electric heating element formed by forming a wide terminal part at the end of an elongated heating part on a base, the boundary between the heating part and the terminal part is close to the terminal part. A heating element characterized in that the resistance value in the longitudinal direction is configured to be small according to the following.
成してなる電気発熱体を設けた加熱体において、上記発
熱部と上記端子部との境界部はガラス質保護膜で被覆さ
れていることを特徴とする加熱体。(2) In a heating element provided with an electric heating element formed by forming a wide terminal part at the end of an elongated heating part on a base, the boundary between the heating part and the terminal part is covered with a glassy protective film. A heating body characterized by:
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63282777A JP2740207B2 (en) | 1988-11-09 | 1988-11-09 | Fixing heating element, fixing device and office equipment |
| EP89308485A EP0360418B1 (en) | 1988-08-25 | 1989-08-22 | Strip heater |
| US07/396,700 US5068517A (en) | 1988-08-25 | 1989-08-22 | Printed strip heater |
| DE68921124T DE68921124T2 (en) | 1988-08-25 | 1989-08-22 | Heating strips. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63282777A JP2740207B2 (en) | 1988-11-09 | 1988-11-09 | Fixing heating element, fixing device and office equipment |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3067992A Division JPH04215285A (en) | 1991-03-07 | 1991-03-07 | Heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02129883A true JPH02129883A (en) | 1990-05-17 |
| JP2740207B2 JP2740207B2 (en) | 1998-04-15 |
Family
ID=17656943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63282777A Expired - Lifetime JP2740207B2 (en) | 1988-08-25 | 1988-11-09 | Fixing heating element, fixing device and office equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2740207B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006284223A (en) * | 2005-03-31 | 2006-10-19 | Ngk Insulators Ltd | STRUCTURE OF ELECTRODE PART FOR NOx MEASURING, ITS FORMING METHOD AND NOx SENSOR ELEMENT |
| JP2007103294A (en) * | 2005-10-07 | 2007-04-19 | Matsushita Electric Ind Co Ltd | Infrared ray electric bulb, and heating device |
| JP2010244942A (en) * | 2009-04-08 | 2010-10-28 | Harison Toshiba Lighting Corp | Ceramic heater, heating device, and image formation device |
| JP2021089330A (en) * | 2019-12-03 | 2021-06-10 | キヤノン株式会社 | Fixing device and image forming apparatus |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53142527A (en) * | 1977-03-11 | 1978-12-12 | Inst Puruzemisuru Oruganikuzun | Plant parasticide |
| JPS56151151U (en) * | 1980-04-12 | 1981-11-12 | ||
| JPS59169871A (en) * | 1983-03-17 | 1984-09-25 | Fujitsu Ltd | Thermal head |
| JPS6292863A (en) * | 1985-10-18 | 1987-04-28 | Alps Electric Co Ltd | Thermal head |
| JPS62105647A (en) * | 1985-11-01 | 1987-05-16 | Oki Electric Ind Co Ltd | Thermal head and manufacture thereof |
| JPS6351359A (en) * | 1986-08-20 | 1988-03-04 | Dainippon Ink & Chem Inc | Optical active biphenyl ester derivative |
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1988
- 1988-11-09 JP JP63282777A patent/JP2740207B2/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53142527A (en) * | 1977-03-11 | 1978-12-12 | Inst Puruzemisuru Oruganikuzun | Plant parasticide |
| JPS56151151U (en) * | 1980-04-12 | 1981-11-12 | ||
| JPS59169871A (en) * | 1983-03-17 | 1984-09-25 | Fujitsu Ltd | Thermal head |
| JPS6292863A (en) * | 1985-10-18 | 1987-04-28 | Alps Electric Co Ltd | Thermal head |
| JPS62105647A (en) * | 1985-11-01 | 1987-05-16 | Oki Electric Ind Co Ltd | Thermal head and manufacture thereof |
| JPS6351359A (en) * | 1986-08-20 | 1988-03-04 | Dainippon Ink & Chem Inc | Optical active biphenyl ester derivative |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006284223A (en) * | 2005-03-31 | 2006-10-19 | Ngk Insulators Ltd | STRUCTURE OF ELECTRODE PART FOR NOx MEASURING, ITS FORMING METHOD AND NOx SENSOR ELEMENT |
| JP2007103294A (en) * | 2005-10-07 | 2007-04-19 | Matsushita Electric Ind Co Ltd | Infrared ray electric bulb, and heating device |
| JP2010244942A (en) * | 2009-04-08 | 2010-10-28 | Harison Toshiba Lighting Corp | Ceramic heater, heating device, and image formation device |
| JP2021089330A (en) * | 2019-12-03 | 2021-06-10 | キヤノン株式会社 | Fixing device and image forming apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2740207B2 (en) | 1998-04-15 |
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