JPH05242958A - Fixing heater and manufacture thereof - Google Patents

Fixing heater and manufacture thereof

Info

Publication number
JPH05242958A
JPH05242958A JP4132792A JP4132792A JPH05242958A JP H05242958 A JPH05242958 A JP H05242958A JP 4132792 A JP4132792 A JP 4132792A JP 4132792 A JP4132792 A JP 4132792A JP H05242958 A JPH05242958 A JP H05242958A
Authority
JP
Japan
Prior art keywords
glass layer
layer
insulating glass
resistance heating
heating element
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
Application number
JP4132792A
Other languages
Japanese (ja)
Other versions
JP3129505B2 (en
Inventor
Shigehiro Sato
滋洋 佐藤
Hiroyuki Matsunaga
啓之 松永
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Lighting and Technology Corp
Original Assignee
Toshiba Lighting and Technology Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Lighting and Technology Corp filed Critical Toshiba Lighting and Technology Corp
Priority to JP4132792A priority Critical patent/JP3129505B2/en
Priority to DE69218134T priority patent/DE69218134T2/en
Priority to EP92120888A priority patent/EP0546495B1/en
Publication of JPH05242958A publication Critical patent/JPH05242958A/en
Priority to US08/274,367 priority patent/US5587097A/en
Application granted granted Critical
Publication of JP3129505B2 publication Critical patent/JP3129505B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Fixing For Electrophotography (AREA)
  • Surface Heating Bodies (AREA)
  • Resistance Heating (AREA)

Abstract

PURPOSE:To secure the electric insulation withstand voltage and improve the sliding of a copy sheet by preventing the abrasion of a resistance heating element with two glass layers, and dispersing the function. CONSTITUTION:A fixing heater is constituted of two glass layers individually dispersed with the function into an insulating glass layer 5 and a cover glass layer 6. Necessary actions for the glass layers 5, 6 can be sufficiently performed, i.e., the insulating glass layer 5 not only prevents the abrasion of a resistance heating element 2 but also sufficiently secures the electric insulation withstand voltage, and the glass layer 6 improves the sliding of a copy sheet. The cover glass layer 6 is prevented from being made thick and deteriorating the heat conduction of the heating element 2 to increase the electric insulation withstand voltage with only the cover glass. The sluggish sliding of the copy sheet caused when only the insulating glass layer 5 is provided and no cover glass layer 6 is provided can be resolved.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は、例えば複写機のトナ
ー定着等に用いられる定着ヒーターおよびその製造方法
に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing heater used for toner fixing of a copying machine and a method of manufacturing the fixing heater.

【0002】[0002]

【従来の技術】電子式複写機のトナー定着等に用いられ
る定着ヒーターとして、近年、細長いセラミック等の絶
縁基板の表面に銀・パラジウム合金粉末等のペーストを
塗布焼成して細長いライン状の抵抗発熱体を形成したも
のが実用化されている。このライン状の抵抗発熱体の両
端に電圧を印加し、抵抗発熱体の発熱でトナーを定着す
るものである。
2. Description of the Related Art In recent years, as a fixing heater used for toner fixing of an electronic copying machine, a paste of silver / palladium alloy powder or the like is applied to the surface of an insulating substrate such as an elongated ceramic to be fired in a long and narrow line-like shape. A body-shaped one has been put to practical use. A voltage is applied to both ends of the line-shaped resistance heating element to heat the resistance heating element to fix the toner.

【0003】従来、この定着ヒーターは、抵抗発熱体の
表面がガラス層で被覆されている。このガラス層は、定
着ヒーターの表面をトナーを載せたコピー紙がヒーター
に接触しつつ通過するため、ヒーターが摩耗しないよう
にする働きと、コピー紙の滑りを良くする働きと、抵抗
発熱体に流れる電流がリークしないように絶縁を確保す
る働きを有している。
Conventionally, in this fixing heater, the surface of the resistance heating element is covered with a glass layer. This glass layer allows the copy paper with toner to pass through the surface of the fixing heater while coming into contact with the heater, so that the heater does not wear out, the copy paper slips better, and the resistance heating element works. It has the function of ensuring insulation so that the flowing current does not leak.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、従来の
定着ヒーターのカバーガラスは、上記の3つの働きを十
分に果たすことができなかった。これはカバーガラスの
材料に上記3つの働きを十分に果たすものがこれまでに
見つからなかったことによるためであり、いまだに適切
な材料は見つかっていない。
However, the cover glass of the conventional fixing heater cannot sufficiently fulfill the above-mentioned three functions. This is because the material of the cover glass that sufficiently fulfills the above three functions has not been found so far, and an appropriate material has not been found yet.

【0005】そこで本発明の目的とするところは、構造
を変更することにより、カバーガラスの上記3つの働
き、すなわち、ヒーターが摩耗しないようにし、コピー
紙の滑りを良くし、かつ電気絶縁性を十分確保した定着
ヒーターを提供することにある。
Therefore, an object of the present invention is to change the structure so that the above-mentioned three functions of the cover glass, that is, the heater is prevented from being worn, the slip of the copy paper is improved, and the electrical insulation is improved. It is to provide a sufficiently secured fixing heater.

【0006】また、本発明の他の目的は、上記定着ヒー
ターに適する製造方法を提供することにある。
Another object of the present invention is to provide a manufacturing method suitable for the fixing heater.

【0007】[0007]

【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及び請求項2に記載の定着ヒーターは、絶
縁性基板表面上に抵抗発熱体を形成し、この抵抗発熱体
の表面を被覆するように絶縁ガラス層とカバーガラス層
とを積層し、この絶縁ガラスはカバーガラスよりも電気
絶縁耐圧が高く、表面滑らかさRaが低いことを特徴と
する。特に請求項2に記載の定着ヒーターは、絶縁ガラ
ス層は複数層から構成されていることを特徴とする。
In order to achieve the above object, the fixing heater according to claims 1 and 2 forms a resistance heating element on the surface of an insulating substrate, and the surface of the resistance heating element is formed. The insulating glass layer and the cover glass layer are laminated so as to cover the insulating glass, and the insulating glass has a higher electric withstand voltage and a lower surface smoothness Ra than the cover glass. Particularly, the fixing heater according to the second aspect is characterized in that the insulating glass layer is composed of a plurality of layers.

【0008】また請求項3及び請求項4に記載の定着ヒ
ーターの製造方法は、絶縁性の基板表面上に抵抗発熱体
ペーストを塗布焼成して抵抗発熱層を形成し、その次に
抵抗発熱層上に絶縁ガラスペーストを塗布焼成して絶縁
ガラス層を形成し、その次にさらに絶縁ガラス層上に絶
縁ガラス層よりも電気絶縁耐圧が低く、表面滑らかさR
aの高いカバーガラス層形成用のペーストを塗布焼成し
てカバーガラス層を形成することを特徴とする。特に請
求項4に記載の定着ヒーターの製造方法は、絶縁ガラス
層が複数層から構成されていて、各層毎に絶縁ガラスペ
ーストを塗布焼成して絶縁ガラス層を形成することを特
徴とする。
Further, in the method for manufacturing the fixing heater according to the third and fourth aspects, the resistance heating layer is formed by coating and firing the resistance heating element paste on the surface of the insulating substrate, and then the resistance heating layer. An insulating glass paste is applied and fired on the insulating glass layer to form an insulating glass layer. Then, the insulating glass layer has a lower electrical withstand voltage than the insulating glass layer and a surface smoothness R.
It is characterized in that a cover glass layer forming paste having a high a is applied and baked to form a cover glass layer. Particularly, the fixing heater manufacturing method according to claim 4 is characterized in that the insulating glass layer is composed of a plurality of layers, and the insulating glass paste is applied and fired for each layer to form the insulating glass layer.

【0009】[0009]

【作用】請求項1及び請求項2に記載の定着ヒーター
は、2つのガラス層により抵抗発熱体の摩耗を防止でき
るだけでなく、2つの層に機能を分散させたので、3つ
の働きを十分に果たすことができる。即ち絶縁ガラス層
により電気絶縁耐圧を十分に確保することができ、また
カバーガラス層により、コピー紙の滑りを良くすること
ができる。
The fixing heater according to claims 1 and 2 can prevent abrasion of the resistance heating element by the two glass layers, and also has the functions dispersed in the two layers. Can be fulfilled That is, the insulating glass layer can sufficiently secure the electric breakdown voltage, and the cover glass layer can improve the slip of the copy paper.

【0010】特に請求項2に記載の定着ヒーターは、絶
縁ガラス層を複数層に形成したので、絶縁ガラス層全体
の電気絶縁性を十分に確保できる。
Particularly, in the fixing heater according to the second aspect, since the insulating glass layers are formed in a plurality of layers, the electric insulating property of the entire insulating glass layer can be sufficiently secured.

【0011】請求項3及び請求項4に記載の定着ヒータ
ーの製造方法によれば、抵抗発熱体層、絶縁ガラス層、
カバーガラス層の各層を順次、ペーストを塗布焼成する
ので、各ガラス層が混ざり合うこと無く、各層の持つの
機能を十分に発揮することができる。
According to the manufacturing method of the fixing heater of the third and fourth aspects, the resistance heating element layer, the insulating glass layer,
Since each layer of the cover glass layer is sequentially coated with paste and fired, the respective glass layers do not mix with each other, and the functions of the respective layers can be sufficiently exhibited.

【0012】特に請求項4に記載の定着ヒーターの製造
方法によれば、絶縁ガラス層の電気絶縁耐圧を同じ厚さ
で高くすることができる。これは絶縁ガラス層を複数層
に形成するため、絶縁ガラスペーストを複数回塗布焼成
しているので、焼成過程で発生するガスが逃げるときに
形成されるピンホールがその上に塗布されるペーストに
よって埋められる。その結果、絶縁ガラス層が一層の場
合に、絶縁ガラス層を貫通するピンホールが無くなり、
ピンホールを貫通してリークする電流が防止できるの
で、定着ヒーターの電気絶縁性が向上する。
In particular, according to the method of manufacturing the fixing heater of the fourth aspect, it is possible to increase the electric breakdown voltage of the insulating glass layer with the same thickness. Since the insulating glass layer is formed in multiple layers, the insulating glass paste is applied and fired multiple times, so that the pinholes formed when the gas generated in the firing escapes are formed by the paste applied on the pinholes. Buried. As a result, when the insulating glass layer is a single layer, there is no pinhole penetrating the insulating glass layer,
Since a current that leaks through the pinhole can be prevented, the electric insulation of the fixing heater is improved.

【0013】[0013]

【実施例】以下図1ないし図3を参照して本発明の第一
の実施例を説明する。図1は第一の実施例の定着ヒータ
ーの平面図、図2は図1中のA−A線の断面図、図3は
図1中のB−B線の断面図である。基板(1)は耐熱性
を有するアルミナセラミクス(Al2O3)製の長形平板
(約270mm×7mm×1mm程度の大きさ)である。抵抗
発熱体層(2)は通電性のペースト状塗料(材質は銀パ
ラジウム合金(Ag/Pd)、又はこれに酸化ルテニウ
ムを加えた金属(Ag/Pd+RuO2))を基板
(1)上に長手方向に沿った帯状に印刷塗布・焼成する
ことにより厚さ約10μmに形成したものである。この
合金に含まれるパラジウムが電気的な抵抗要素となり、
その比率によって発熱体の抵抗値が調節される。本実施
例では、34オーム[Ω]の抵抗値を有し、100Vの
電圧印加により3Aの電流が流れ、300Wの発熱量と
なる。抵抗発熱体層(2)の両端は幅広に形成されてお
り電極形成部(3)を構成する。抵抗発熱体層(2)の
電極形成部(3)を除いた帯状部分が発熱する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. 1 is a plan view of the fixing heater of the first embodiment, FIG. 2 is a sectional view taken along the line AA in FIG. 1, and FIG. 3 is a sectional view taken along the line BB in FIG. The substrate (1) is a long flat plate (having a size of about 270 mm × 7 mm × 1 mm) made of alumina ceramics (Al 2 O 3) having heat resistance. The resistance heating element layer (2) is a conductive paste-like paint (material is silver-palladium alloy (Ag / Pd) or metal (Ag / Pd + RuO2) with ruthenium oxide added to this) on the substrate (1) in the longitudinal direction. It is formed to have a thickness of about 10 μm by printing and applying in a band shape along the line. Palladium contained in this alloy becomes an electrical resistance element,
The resistance value of the heating element is adjusted by the ratio. In this embodiment, the resistance value is 34 Ω [Ω], the current of 3 A flows by the voltage application of 100 V, and the heat generation amount is 300 W. Both ends of the resistance heating element layer (2) are formed wide so as to form an electrode forming portion (3). The strip-shaped portion of the resistance heating layer (2) excluding the electrode forming portion (3) generates heat.

【0014】抵抗発熱体層(2)の両端の電極形成部
(3)の表面には外部電極(図示しない)と接続をする
ための電極層(4)が形成されている。この電極層
(4)は抵抗発熱体層(2)よりも接触電気抵抗が小さ
くするために設けられたもので、銀(Ag),銀プラチ
ナ合金(Ag/Pt),金(Au),プラチナ(Pt)
等の金属ペーストが用いられる。すなわち、電極形成部
(3)を含めて抵抗発熱体層(2)が形成された後(抵
抗発熱体ペーストを印刷塗布・焼成後)、これらの金属
ペーストを電極形成部(3)上に印刷塗布・焼成するこ
とで厚さ約10μmに電極層(4)が形成される。
Electrode layers (4) for connecting to external electrodes (not shown) are formed on the surfaces of the electrode forming portions (3) at both ends of the resistance heating layer (2). This electrode layer (4) is provided to make the contact electric resistance smaller than that of the resistance heating layer (2), and is made of silver (Ag), silver-platinum alloy (Ag / Pt), gold (Au), platinum. (Pt)
A metal paste such as is used. That is, after the resistance heating element layer (2) is formed including the electrode forming section (3) (after the resistance heating element paste is applied by printing and firing), these metal pastes are printed on the electrode forming section (3). By coating and baking, the electrode layer (4) is formed to have a thickness of about 10 μm.

【0015】上記抵抗発熱体層(2)の帯状部分の表面
は、電気絶縁性の高いガラス質によってコーティングさ
れて、絶縁ガラス層(5)が形成されている。この絶縁
ガラス層(5)はほう珪酸ガラスを主成分としており、
例えば日本電気ガラス(株)製の絶縁ガラスペーストP
LS3310を印刷塗布・焼成して厚さ約10μmに形
成したものである。PLS3310を用いた絶縁ガラス
は厚さ35μmの場合に直流電圧を印加する条件で電気
絶縁耐圧が2000Vを有する。絶縁ガラスペーストP
LS3310は抵抗発熱体層(2)形成後に印刷塗布・
焼成される。
The surface of the strip-shaped portion of the resistance heating element layer (2) is coated with glass having a high electric insulation property to form an insulating glass layer (5). This insulating glass layer (5) is mainly composed of borosilicate glass,
For example, insulating glass paste P manufactured by Nippon Electric Glass Co., Ltd.
LS3310 is formed by printing, coating and firing to a thickness of about 10 μm. The insulating glass using PLS3310 has an electric breakdown voltage of 2000 V under the condition that a DC voltage is applied when the thickness is 35 μm. Insulating glass paste P
LS3310 is applied by printing after forming the resistance heating layer (2).
To be fired.

【0016】絶縁ガラス層(5)は抵抗発熱体層(2)
の帯状部分だけでなく電極層(4)の境界部分まで塗布
されている。これは抵抗発熱体層(2)の帯状部分と電
極形成部(3)の境界付近の温度勾配が急なために、こ
の付近の抵抗発熱体層(2)が断線する可能性が高い
が、この部分を絶縁ガラス層(5)で覆うことにより、
この危険性を低減している。また電極層(4)の境界付
近(抵抗発熱体層(2)の帯状部分側)は発熱の影響で
剥離しやすいが、この部分を絶縁ガラス層(5)で覆う
ことにより、この危険性も低減している。
The insulating glass layer (5) is a resistance heating element layer (2).
Is applied to not only the strip-shaped portion of the electrode layer but also the boundary portion of the electrode layer (4). This is because the temperature gradient near the boundary between the strip-shaped portion of the resistance heating element layer (2) and the electrode forming portion (3) is steep, so that the resistance heating element layer (2) in the vicinity is likely to be disconnected. By covering this part with the insulating glass layer (5),
This risk is reduced. Further, the vicinity of the boundary of the electrode layer (4) (on the side of the strip portion of the resistance heating element layer (2)) is easily peeled off due to the effect of heat generation, but by covering this portion with the insulating glass layer (5), this danger also occurs. It is decreasing.

【0017】絶縁ガラス層(5)の表面は、電気絶縁性
は低いが表面の滑らかさの高いガラス質によってコーテ
ィングされて、カバーガラス層(6)が形成されてい
る。このカバーガラス層(6)は酸化鉛の多い鉛ガラス
を主成分としており、例えば田中貴金属インターナショ
ナル(株)製のガラスペーストLS207を印刷塗布・
焼成して厚さ約10μmに形成したものである。LS2
07は厚さ35μm、直流電圧印加の条件で電気絶縁耐
圧が1500Vないし1000Vと低いが、表面なめら
かさRaを0.02μm以下と小さくできる。
The surface of the insulating glass layer (5) is coated with a glass material having a low electric insulation property but a high surface smoothness to form a cover glass layer (6). The cover glass layer (6) is mainly composed of lead glass containing a large amount of lead oxide. For example, a glass paste LS207 manufactured by Tanaka Kikinzoku International Co., Ltd. is applied by printing.
It is formed by firing to a thickness of about 10 μm. LS2
No. 07 has a thickness of 35 μm and has a low electric breakdown voltage of 1500 V to 1000 V under the condition of applying a DC voltage, but the surface smoothness Ra can be reduced to 0.02 μm or less.

【0018】これに対してPLS3310を用いて形成
した絶縁ガラス層(5)の表面滑らかさRaは1ないし
2μm程度である。絶縁ガラス層(5)は、電気絶縁性
を高めるため、金属酸化物のフィラーが添加されている
等の理由ににより、焼成温度を高くしても表面の滑らか
さが十分になりにくいためである。なおカバーガラスペ
ーストLS207は絶縁ガラス層(5)形成後に印刷塗
布・焼成される。
On the other hand, the surface smoothness Ra of the insulating glass layer (5) formed by using PLS3310 is about 1 to 2 μm. This is because the insulating glass layer (5) is not likely to have a sufficiently smooth surface even if the firing temperature is increased, for the reason that a filler of a metal oxide is added in order to enhance electric insulation. .. The cover glass paste LS207 is applied by printing and baked after the insulating glass layer (5) is formed.

【0019】以上の構成を有する定着用ヒーターは、絶
縁ガラス層(5)とカバーガラス層(6)との個々に機
能を分散させた2つのガラス層を有しているので、ガラ
ス層に必要な働きを十分に果たすことができる。即ち抵
抗発熱体(2)の摩耗を防止できるだけでなく、絶縁ガ
ラス層(5)により電気絶縁耐圧を十分に確保すること
ができ、またカバーガラス層(6)により、コピー紙の
滑りを良くすることができる。すなわち、カバーガラス
だけにより電気絶縁耐圧を高めるために、カバーガラス
層を厚くし、その結果抵抗発熱体(2)の熱伝導が悪く
なったりすることがない。また絶縁ガラス層(5)だけ
でカバーガラス層(6)を設けないことにより、コピー
紙の滑りが悪くなる欠点を解消することができる。
The fixing heater having the above structure has two glass layers in which the insulating glass layer (5) and the cover glass layer (6) have their respective functions dispersed, and therefore is required for the glass layer. Can fully perform such functions. That is, not only can the abrasion of the resistance heating element (2) be prevented, but also the insulating glass layer (5) can sufficiently secure the electric breakdown voltage, and the cover glass layer (6) can improve the slipping of the copy paper. be able to. That is, the cover glass layer is thickened in order to increase the electric breakdown voltage only by the cover glass, and as a result, the heat conduction of the resistance heating element (2) does not deteriorate. Further, by not providing the cover glass layer (6) only with the insulating glass layer (5), it is possible to eliminate the drawback that the slip of the copy paper is deteriorated.

【0020】また上記の製造方法によれば、抵抗発熱体
層(2)、絶縁ガラス層(5)、カバーガラス層(6)
の各層を順次、ペーストを塗布焼成するので、各ガラス
層が混ざり合うこと無く、各層の持つの機能を十分に発
揮することができる。
According to the above manufacturing method, the resistance heating element layer (2), the insulating glass layer (5), and the cover glass layer (6).
Since each layer is sequentially coated with the paste and fired, the respective glass layers do not mix with each other, and the function of each layer can be sufficiently exhibited.

【0021】次に本発明の第2の実施例を図4を参照し
て説明する。図4は第2の実施例に係る定着ヒーターの
断面図であり、第1実施例の図3に対応するものであ
る。この定着ヒーターは絶縁ガラス層(5a)(5b)
(5c)が3層構造になっており、その他の構成は第1
の実施例と同一なので説明を省略し、また図中の参照番
号も同一の番号を付与する。
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a sectional view of a fixing heater according to the second embodiment, and corresponds to FIG. 3 of the first embodiment. This fixing heater has insulating glass layers (5a) (5b)
(5c) has a three-layer structure, and other configurations are first
The description thereof is omitted because it is the same as that of the embodiment described above, and the same reference numerals are given in the drawings.

【0022】各絶縁ガラス層(5a)(5b)(5c)
は第1の実施例と同一ガラス組成を有しており、各絶縁
ガラス層(5a)(5b)(5c)の形成方法も同一で
ある。すなわち、各層毎に絶縁ガラスペーストPLS3
310を印刷塗布・焼成を繰り返したものである。
Each insulating glass layer (5a) (5b) (5c)
Has the same glass composition as in the first embodiment, and the method of forming each insulating glass layer (5a) (5b) (5c) is also the same. That is, insulating glass paste PLS3 for each layer
310 is obtained by repeating printing coating and baking.

【0023】この様な定着用ヒーターは、第1の実施例
と同様、抵抗発熱体層(2)の摩耗を防止できるだけで
なく、絶縁ガラス層(5)により電気絶縁耐圧を十分に
確保することができ、またカバーガラス層(6)によ
り、コピー紙の滑りを良くすることができる。
Like the first embodiment, such a fixing heater can not only prevent abrasion of the resistance heating element layer (2) but also ensure a sufficient electric breakdown voltage by the insulating glass layer (5). In addition, the cover glass layer (6) can improve the slipperiness of the copy paper.

【0024】特に上記の定着ヒーターの製造方法によれ
ば、絶縁ガラス層の電気絶縁耐圧を同じ厚さで高くする
ことができる。これは絶縁ガラス層を複数層に形成する
ため、絶縁ガラスペーストを複数回塗布焼成しているの
で、焼成過程で発生するガスが逃げるときに形成される
ピンホールが、その上に塗布されるペーストによって埋
められる。その結果、絶縁ガラス層が一層の場合に形成
される、絶縁ガラス層を貫通するピンホールが無くな
り、ピンホールを貫通してリークする電流が防止でき、
定着ヒーターの電気絶縁性が向上するからである。
In particular, according to the above-described method of manufacturing the fixing heater, the insulating voltage of the insulating glass layer can be increased with the same thickness. This is because the insulating glass paste is formed in multiple layers, so the insulating glass paste is applied and fired multiple times, so the pinholes formed when the gas generated during the firing escapes are the paste applied on top of it. Filled by. As a result, when the insulating glass layer is a single layer, there is no pinhole penetrating the insulating glass layer, and it is possible to prevent a current leaking through the pinhole.
This is because the electric insulation of the fixing heater is improved.

【0025】[0025]

【発明の効果】上記の様な構成を有する本発明の定着ヒ
ーターは、2つのガラス層により抵抗発熱体の摩耗を防
止できるだけでなく、2つの層に機能を分散させたの
で、電気絶縁耐圧を十分に確保することができ、またコ
ピー紙の滑りを良くすることができる。
The fixing heater of the present invention having the above-described structure can prevent abrasion of the resistance heating element by the two glass layers, and the functions are dispersed in the two layers, so that the electric breakdown voltage can be improved. It is possible to sufficiently secure it, and it is possible to improve the slippage of the copy paper.

【0026】本発明の定着ヒーターの製造方法によれば
抵抗発熱体層、絶縁ガラス層、カバーガラス層の各層を
順次、ペーストを塗布焼成するので、各ガラス層が混ざ
り合うこと無く、各層の持つの機能を十分に発揮するこ
とができる。
According to the method for manufacturing the fixing heater of the present invention, the resistance heating element layer, the insulating glass layer, and the cover glass layer are sequentially coated and fired with paste, so that the glass layers do not mix with each other and have each layer. The function of can be fully exerted.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の第1の実施例に係る定着ヒーターの平
面図
FIG. 1 is a plan view of a fixing heater according to a first embodiment of the present invention.

【図2】図1中のA−A線における断面図FIG. 2 is a sectional view taken along the line AA in FIG.

【図3】図1中のB−B線のにおける断面図FIG. 3 is a sectional view taken along line BB in FIG.

【図4】図3に対応する本発明の第2の実施例に係る定
着ヒーターの断面図
FIG. 4 is a sectional view of a fixing heater according to a second embodiment of the present invention corresponding to FIG.

【符号の説明】[Explanation of symbols]

1 基板 2 抵抗発熱体層 3 電極形成部 4 電極層 5 絶縁ガラス層 6 カバーガラス層 DESCRIPTION OF SYMBOLS 1 Substrate 2 Resistance heating element layer 3 Electrode forming part 4 Electrode layer 5 Insulating glass layer 6 Cover glass layer

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 絶縁性の基板と、前記基板表面上に形成
された抵抗発熱体と、前記抵抗発熱体の表面を被覆する
ように積層された絶縁ガラス層と前記絶縁ガラス表面に
積層されたカバーガラス層とからなり、前記絶縁ガラス
はカバーガラスよりも電気絶縁耐圧が高く、表面滑らか
さRaが低いことを特徴とする定着ヒーター。
1. An insulating substrate, a resistance heating element formed on the surface of the substrate, an insulating glass layer laminated to cover the surface of the resistance heating element, and an insulating glass layer laminated on the insulating glass surface. A fixing heater comprising a cover glass layer, wherein the insulating glass has a higher electric breakdown voltage and a lower surface smoothness Ra than the cover glass.
【請求項2】 前記絶縁ガラス層は複数層から構成され
ていることを特徴とする請求項1の定着ヒーター。
2. The fixing heater according to claim 1, wherein the insulating glass layer is composed of a plurality of layers.
【請求項3】 絶縁性の基板表面上に抵抗発熱体ペース
トを塗布焼成して抵抗発熱層を形成する工程と、前記抵
抗発熱層上に絶縁ガラスペーストを塗布焼成して絶縁ガ
ラス層を形成する工程と、前記絶縁ガラス層上に絶縁ガ
ラス層よりも電気絶縁耐圧が低く、表面滑らかさRaの
高いカバーガラス層形成用のペーストを塗布焼成してカ
バーガラス層を形成する工程とを有することを特徴とす
る定着用ヒーターの製造方法。
3. A step of applying a resistance heating element paste on the surface of an insulating substrate to form a resistance heating layer, and a step of applying an insulating glass paste to the resistance heating layer to form an insulating glass layer. And a step of forming a cover glass layer on the insulating glass layer by applying a paste for forming a cover glass layer having a lower electric withstand voltage than that of the insulating glass layer and having a high surface smoothness Ra to form a cover glass layer. A method for manufacturing a fixing heater characterized by the above.
【請求項4】 前記絶縁ガラス層は複数層から構成され
ており、各層毎に絶縁ガラスペーストを塗布焼成して絶
縁ガラス層を形成することを特徴とする請求項3の定着
ヒーターの製造方法。
4. The method for manufacturing a fixing heater according to claim 3, wherein the insulating glass layer is composed of a plurality of layers, and an insulating glass paste is applied and fired for each layer to form the insulating glass layer.
JP4132792A 1991-12-09 1992-02-27 Fixing heating element, fixing device, and image forming apparatus Expired - Fee Related JP3129505B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP4132792A JP3129505B2 (en) 1992-02-27 1992-02-27 Fixing heating element, fixing device, and image forming apparatus
DE69218134T DE69218134T2 (en) 1991-12-09 1992-12-08 Fixing heating element and method for its production
EP92120888A EP0546495B1 (en) 1991-12-09 1992-12-08 Fixing heater and method of manufacturing fixing heater
US08/274,367 US5587097A (en) 1991-12-09 1994-07-13 Fixing heater and method of manufacturing fixing heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4132792A JP3129505B2 (en) 1992-02-27 1992-02-27 Fixing heating element, fixing device, and image forming apparatus

Publications (2)

Publication Number Publication Date
JPH05242958A true JPH05242958A (en) 1993-09-21
JP3129505B2 JP3129505B2 (en) 2001-01-31

Family

ID=12605427

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4132792A Expired - Fee Related JP3129505B2 (en) 1991-12-09 1992-02-27 Fixing heating element, fixing device, and image forming apparatus

Country Status (1)

Country Link
JP (1) JP3129505B2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002289328A (en) * 2001-03-23 2002-10-04 Rohm Co Ltd Exothermic body, fixing apparatus using the same and manufacturing method of exothermic body
JP2008204712A (en) * 2007-02-19 2008-09-04 Rohm Co Ltd Heater
JP2020122938A (en) * 2019-01-31 2020-08-13 株式会社リコー Heating body, fixing device, and image formation device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2955976A1 (en) * 2014-06-12 2015-12-16 AGC Glass Europe Heating glass

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002289328A (en) * 2001-03-23 2002-10-04 Rohm Co Ltd Exothermic body, fixing apparatus using the same and manufacturing method of exothermic body
JP4593824B2 (en) * 2001-03-23 2010-12-08 ローム株式会社 Heating element, fixing device using the same, and method of manufacturing heating element
JP2008204712A (en) * 2007-02-19 2008-09-04 Rohm Co Ltd Heater
JP2020122938A (en) * 2019-01-31 2020-08-13 株式会社リコー Heating body, fixing device, and image formation device

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