JPH08115783A - Heating roller and thermally fixing apparatus of electrophotographic apparatus - Google Patents
Heating roller and thermally fixing apparatus of electrophotographic apparatusInfo
- Publication number
- JPH08115783A JPH08115783A JP25255394A JP25255394A JPH08115783A JP H08115783 A JPH08115783 A JP H08115783A JP 25255394 A JP25255394 A JP 25255394A JP 25255394 A JP25255394 A JP 25255394A JP H08115783 A JPH08115783 A JP H08115783A
- Authority
- JP
- Japan
- Prior art keywords
- heating roller
- heat
- roller
- heating
- thermal conductivity
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は複写機、ファクシミリ、
プリンター等の電子写真プロセスに用いられる加熱ロー
ラ及びそれを用いた熱定着装置に関する。BACKGROUND OF THE INVENTION The present invention relates to a copying machine, a facsimile,
The present invention relates to a heating roller used in an electrophotographic process such as a printer and a heat fixing device using the heating roller.
【０００２】[0002]
【従来の技術】従来、電子写真プロセスの熱定着装置と
しては、待機中にはヒーターをオフにし、熱定着時のみ
ヒーターをオンにする低消費電力タイプのものが提案さ
れており、その加熱ローラのヒートアップ時間を短縮す
るため、加熱ローラの外周表面に導電発熱層を形成した
ものがある。しかしながら、電子写真装置の熱定着装置
の妥当な電力レベルである６００〜７００Ｗ以下では、
加熱ローラが十分に昇温しないため、定着が不十分とな
るといった問題がある。2. Description of the Related Art Conventionally, as a heat fixing device for an electrophotographic process, a low power consumption type device has been proposed in which a heater is turned off during standby and a heater is turned on only during heat fixing. In order to reduce the heat-up time, the heating roller has a conductive heating layer formed on the outer peripheral surface. However, at 600 to 700 W or lower, which is a reasonable power level of the heat fixing device of the electrophotographic apparatus,
Since the heating roller does not heat up sufficiently, there is a problem that fixing is insufficient.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、上記事情に
鑑みなされたもので、低い電力レベルでも十分な定着を
行うことができる加熱ローラ及び電子写真装置の熱定着
装置を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heating roller and a heat fixing device for an electrophotographic apparatus, which can perform sufficient fixing even at a low power level. And
【０００４】[0004]
【課題を解決するするための手段】即ち、本発明の骨子
は、まず、請求項１の如く、円筒状或は円柱状のローラ
支持体と、このローラ支持体の表面に形成された通電発
熱層と、この通電発熱層の外周に形成された表面層から
なる加熱ローラにおいて、前記ローラ支持体の直径が２
５ｍｍ以下、前記発熱層の厚さが０．８ｍｍ以下、前記
ローラ支持体の熱伝導率が０．００５ｃａｌ／ｃｍ・秒
・℃以下であることを特徴とする加熱ローラであり、更
に、請求項２の如く、上記加熱ローラ支持体がポリフェ
ニレンスルフィド、ポリエーテルスルホン、ポリエーテ
ルエーテルケトン、フェノール樹脂等の耐熱性樹脂か又
は当該樹脂から成るコンポジット、或いはセラミックス
からなることを特徴とする。That is, the essence of the present invention is to provide a cylindrical or cylindrical roller support and an electric heat generation formed on the surface of the roller support as described in claim 1. In a heating roller comprising a layer and a surface layer formed on the outer periphery of the energization heat generating layer, the roller support has a diameter of 2
The heating roller is characterized in that the heating layer has a thickness of 5 mm or less, the heating layer has a thickness of 0.8 mm or less, and the roller support has a thermal conductivity of 0.005 cal / cm · sec · ° C. or less. As described in 2, the heat roller support is made of a heat resistant resin such as polyphenylene sulfide, polyether sulfone, polyether ether ketone, and phenol resin, or a composite of the resin, or ceramics.
【０００５】更に、請求項３において、上記通電発熱層
が導電性粉体を無機系コーテイング液またはシリコンワ
ニス液またはポリイミドワニスに分散させたものである
ことを特徴とする加熱ローラであり、また、請求項４に
おいて、上記表面層がフッ素樹脂塗料及び／又は潤滑性
粉体を分散させた無機コーテイング液、シリコンワニス
液又はポリイミドワニス液であることを特徴とする加熱
ローラとしたことである。Further, in the third aspect of the present invention, there is provided a heating roller characterized in that the electrically conductive heat generating layer is formed by dispersing conductive powder in an inorganic coating liquid, a silicon varnish liquid, or a polyimide varnish. In claim 4, the heating layer is characterized in that the surface layer is an inorganic coating liquid, a silicon varnish liquid or a polyimide varnish liquid in which a fluororesin coating material and / or a lubricating powder is dispersed.
【０００６】そして請求項５において、通電発熱する加
熱ローラと加圧ローラとの間にトナーの付着した転写紙
を通すことにより、トナーを転写紙に定着する電子写真
装置の熱定着装置において、前記加熱ローラが請求項１
乃至４記載の加熱ローラであることを特徴とする電子写
真装置の熱定着装置とすることで、従来の前述に記載し
た問題点を解決したものである。According to a fifth aspect of the present invention, there is provided a thermal fixing device of an electrophotographic apparatus for fixing the toner onto the transfer paper by passing the transfer paper on which the toner adheres between a heating roller and a pressure roller that generate heat by energization. The heating roller is claim 1.
By using the heat fixing device of the electrophotographic apparatus, which is the heating roller described in any one of 4 to 4, the above-mentioned conventional problems are solved.
【０００７】[0007]
【作用】加熱ローラが円筒状或いは円柱状のローラ支持
体と、このローラ支持体の円周外面上に形成された通電
発熱層、そして通電発熱層の外周表面に形成された表面
層から成り、加熱ローラの直径が２５ｍｍ以下、通電発
熱層の厚みが０．８ｍｍ以下、ローラ支持体の熱伝導率
が０．００５ｃａｌ／ｃｍ・秒・℃以下であることによ
り、発熱層の熱容量の低減と発熱層から発生する熱のロ
ーラ支持体への伝熱による失熱の低減が行われるため、
電子写真装置の熱定着装置の妥当な電力レベルである６
００〜７００Ｗ以下で十分な定着を行うことができ、更
には１０数秒以内に加熱ローラが定着温度まで昇温する
加熱ローラ及び電子写真装置の熱定着装置を提供するこ
とができる。The heating roller comprises a cylindrical or columnar roller support, an electrically conductive heat generating layer formed on the outer circumferential surface of the roller support, and a surface layer formed on the outer peripheral surface of the electrically conductive heat generating layer. Since the diameter of the heating roller is 25 mm or less, the thickness of the electric heating layer is 0.8 mm or less, and the thermal conductivity of the roller support is 0.005 cal / cm · sec · ° C or less, the heat capacity of the heating layer is reduced and heat is generated. Since reduction of heat loss due to heat transfer to the roller support of heat generated from the layer is performed,
It is a reasonable power level of the heat fixing device of the electrophotographic apparatus. 6
It is possible to provide sufficient fixing at a temperature of from 00 to 700 W or less, and further to provide a heating roller in which the heating roller heats up to the fixing temperature within 10 seconds or more, and a heat fixing device for an electrophotographic apparatus.
【０００８】[0008]
【実施例】以下、図面を用いて更に詳細に説明する。図
１は本発明の熱定着装置の加熱ローラの一例を示す概略
断面図である。１は円筒状のローラ支持体で熱伝導率が
小さく、剛性の大きい耐熱性材料から形成される。例え
ば、ポリフェニレンスルフィド、ポリエーテルスルホ
ン、ポリアリレート（芳香族ポリエステル）、ポリエー
テルエーテルケトン、ポリアミドイミド、ポリエーテル
イミド、フェノール樹脂等の耐熱性樹脂か又は当該樹脂
とガラス繊維等とのコンポジット、或いは低熱伝導率の
セラミックスが挙げられる。Embodiments will be described in more detail below with reference to the drawings. FIG. 1 is a schematic sectional view showing an example of a heating roller of the heat fixing device of the present invention. A cylindrical roller support 1 is made of a heat-resistant material having a low thermal conductivity and a high rigidity. For example, polyphenylene sulfide, polyether sulfone, polyarylate (aromatic polyester), polyether ether ketone, polyamide imide, polyether imide, phenol resin, or other heat-resistant resin, or a composite of the resin and glass fiber, or low heat Conductive ceramics may be mentioned.
【０００９】また、ローラ支持体１の直径は２５ｍｍ以
下が適当である。２５ｍｍ以上になると通電発熱層の表
面積が大きくなるためローラ支持体への伝熱失熱が増し
たり、また通電発熱層の体積の増加、則ち熱容量の増加
を招くためヒートアップ時間が長くなる。また、ローラ
支持体の熱伝導率は０．００５ｃａｌ／ｃｍ・秒・℃以
下が好ましく、これを超えると発熱層の伝熱失熱が多く
なるため好ましくない。The diameter of the roller support 1 is preferably 25 mm or less. When it is 25 mm or more, the surface area of the energizing heat generating layer is increased, so that heat transfer and heat loss to the roller support is increased, and the volume of the energizing heat generating layer is increased, that is, the heat capacity is increased, so that the heat-up time is lengthened. Further, the thermal conductivity of the roller support is preferably 0.005 cal / cm · sec · ° C. or less, and if it exceeds this, heat transfer heat loss of the heat generating layer increases, which is not preferable.
【００１０】２は通電発熱層で溶射、メッキ、蒸着、ス
パッタ、導電性塗料塗布、炭素繊維コンポジット形成等
の方法で形成される。通電発熱層を形成するための導電
性塗料としては導電性粉体を無機系コーテイング液また
はシリコンワニス液またはポリイミドワニスに分散させ
たもの等を用いることができる。導電性粉体としては黒
鉛粉体、カーボンブラック、金属粉体、導電性セラミッ
ク粉体等が挙げられる。所定のヒーター電力となるよう
に通電発熱層の体積固有抵抗値と厚み及び電極パターン
との組み合わせを選択することができる。通電発熱層の
厚さは０．８ｍｍ以下、より好ましくは０．５ｍｍ以下
が適当であり、これ以上になると熱容量増大によるヒー
トアップ時間の増加を招き好ましくない。Numeral 2 is an electric heating layer, which is formed by a method such as thermal spraying, plating, vapor deposition, sputtering, application of a conductive paint, and formation of a carbon fiber composite. As the conductive coating material for forming the electric heating layer, it is possible to use, for example, one in which conductive powder is dispersed in an inorganic coating liquid, a silicon varnish liquid, or a polyimide varnish. Examples of the conductive powder include graphite powder, carbon black, metal powder, conductive ceramic powder and the like. The combination of the volume specific resistance value, the thickness and the electrode pattern of the energization heat generating layer can be selected so as to obtain a predetermined heater power. The thickness of the electric heating layer is 0.8 mm or less, more preferably 0.5 mm or less, and if the thickness is more than this, the heat capacity is increased and the heat-up time is increased, which is not preferable.
【００１１】３は表面層で通電発熱層の被覆及び離型性
付与を目的としており、市販のフッ素樹脂塗料又は潤滑
性粉体を分散させた無機系コーテイング液、シリコンワ
ニス液またはポリイミドワニス液等を用いることができ
る。表面層の厚みは０．１ｍｍ以下であり、０．１ｍｍ
を超えると加熱ローラ表面の昇温が遅れるので好ましく
ない。図２は、本発明の加熱ローラのその他の実施例を
示す概略断面図であり、１の円筒状のローラ支持体を補
強するため、その内部に円柱状のシャフト６を挿入した
ものである。以下、本発明を実施例、比較例を挙げて、
より具体的に説明するが本発明はこれらに限定されるも
のではない。Reference numeral 3 is a surface layer for the purpose of covering the current-generating heat generating layer and imparting releasability, and a commercially available fluororesin paint or an inorganic coating liquid in which a lubricating powder is dispersed, a silicon varnish liquid or a polyimide varnish liquid, etc. Can be used. The thickness of the surface layer is 0.1 mm or less, 0.1 mm
If it exceeds, the temperature rise on the surface of the heating roller is delayed, which is not preferable. FIG. 2 is a schematic cross-sectional view showing another embodiment of the heating roller of the present invention, in which a cylindrical shaft 6 is inserted therein to reinforce one cylindrical roller support. Hereinafter, the present invention will be described with reference to Examples and Comparative Examples.
More specifically, the present invention is not limited to these.
【００１２】[0012]
（実施例１）ローラ支持体に直径２０ｍｍ、肉厚３ｍｍ
のフェノール樹脂の筒を用いた。また発熱層として、黒
鉛粉と銀粉を略計５０体積％を含んだポリイミドワニス
を塗布し、０．５ｍｍの厚みの塗膜を形成した。更に、
表面層としてフッ素樹脂系コーテイング材を積層した。
発熱層の電極間距離は２３０ｍｍ、電極間抵抗は１５．
５Ω、１００Ｖ印加時の発熱出力は６４５ワットであっ
た。定着装置に１００Ｖの電圧を印加した時、加熱ロー
ラ表面温度が室温から１８０℃に達するヒートアップ時
間は１１秒であった。(Example 1) Diameter of roller support is 20 mm and wall thickness is 3 mm
Phenol resin cylinders were used. As the heat generating layer, a polyimide varnish containing approximately 50% by volume of graphite powder and silver powder was applied to form a coating film having a thickness of 0.5 mm. Furthermore,
A fluororesin-based coating material was laminated as a surface layer.
The distance between the electrodes of the heat generating layer is 230 mm, and the resistance between the electrodes is 15.
The heat output when applying 5 Ω and 100 V was 645 watts. When a voltage of 100 V was applied to the fixing device, the heat-up time for the surface temperature of the heating roller to reach 180 ° C. from room temperature was 11 seconds.
【００１３】（実施例２）ローラ支持体であるフェノー
ル樹脂筒の直径を１５ｍｍ、発熱層の膜厚を０．６５と
した以外は実施例１と同様にして加熱ローラを作成し
た。この時の電極間抵抗は１５．２Ω、発熱出力は６３
７ワットでヒートアップ時間は８秒であった。(Example 2) A heating roller was prepared in the same manner as in Example 1 except that the diameter of the phenol resin cylinder as the roller support was 15 mm and the thickness of the heat generating layer was 0.65. At this time, the interelectrode resistance was 15.2Ω and the heat output was 63.
At 7 watts, the heat up time was 8 seconds.
【００１４】（比較例１）ローラ支持体に直径２０ｍ
ｍ、肉厚２ｍｍのアルミ筒を用い、その表面に絶縁膜と
してポリイミドワニスを塗布した以外は実施例１と同様
にして加熱ローラを作成した。電極間抵抗は１５．５
Ω、発熱出力は６４５ワットでヒートアップ時間は２２
秒であった。(Comparative Example 1) The roller support has a diameter of 20 m.
A heating roller was produced in the same manner as in Example 1 except that an aluminum cylinder having a thickness of 2 mm and a thickness of 2 mm was used, and polyimide varnish was applied to the surface as an insulating film. Resistance between electrodes is 15.5.
Ω, heat output 645 watts, heat up time 22
It was seconds.
【００１５】（比較例２）ローラ支持体に直径３０ｍ
ｍ、肉厚３ｍｍのフェノール樹脂筒を用い、発熱層厚み
を０．３３ｍｍとした以外は実施例１と同様にして加熱
ローラを作成した。電極間抵抗は１５．２Ω、発熱出力
は６５８ワットでヒートアップ時間は１９秒であった。(Comparative Example 2) The roller support has a diameter of 30 m.
A heating roller was prepared in the same manner as in Example 1 except that a phenol resin cylinder having a thickness of 3 mm and a thickness of 3 mm was used and the thickness of the heat generating layer was 0.33 mm. The interelectrode resistance was 15.2Ω, the heat output was 658 watts, and the heat-up time was 19 seconds.
【００１６】[0016]
【表１】 これらの結果から判るように、ローラ支持体の直径を２
５ｍｍ以下、通電発熱層の厚みが０．８ｍｍ以下、ロー
ラ支持体の熱伝導率が０．００５ｃａｌ／ｃｍ・秒・℃
以下とすることで、１０数秒以内で所定の定着温度に達
している。[Table 1] As can be seen from these results, the diameter of the roller support is 2
5 mm or less, the thickness of the electric heating layer is 0.8 mm or less, and the thermal conductivity of the roller support is 0.005 cal / cm · sec · ° C.
By the following, the predetermined fixing temperature is reached within 10 seconds or less.
【００１７】[0017]
【発明の効果】以上説明したように、本発明によればヒ
ートアップ時間の短い加熱ローラ及び電子写真装置の熱
定着装置を提供できるものである。As described above, according to the present invention, it is possible to provide a heating roller having a short heat-up time and a heat fixing device for an electrophotographic apparatus.
【図面の簡単な説明】[Brief description of drawings]
【図１】図１は本発明の一実施例の熱定着装置の加熱ロ
ーラの概略断面図である。FIG. 1 is a schematic sectional view of a heating roller of a heat fixing device according to an embodiment of the present invention.
【図２】図２は本発明の他の実施例の熱定着装置の加熱
ローラの概略断面図である。FIG. 2 is a schematic cross-sectional view of a heating roller of a heat fixing device according to another embodiment of the present invention.
【図３】図３は本発明の他の実施例の熱定着装置の加熱
ローラの概略断面図である。FIG. 3 is a schematic sectional view of a heating roller of a heat fixing device according to another embodiment of the present invention.
【符号の説明】 １・・・・加熱ローラ支持体 ２・・・・通電発熱層 ３・・・・表面層 ４・・・・通電発熱層電極 ５・・・・スライドコンタクト ６・・・・シャフト[Explanation of symbols] 1 ... Heating roller support 2 ... Electric heating layer 3 ... Surface layer 4 ... Electric heating layer electrode 5 ... Slide contact 6 ... shaft
Claims (5)
のローラ支持体の表面に形成された通電発熱層と、この
通電発熱層の外周に形成された表面層からなる加熱ロー
ラにおいて、前記ローラ支持体の直径が２５ｍｍ以下、
前記発熱層の厚さが０．８ｍｍ以下、前記ローラ支持体
の熱伝導率が０．００５ｃａｌ／ｃｍ・秒・℃以下であ
ることを特徴とする加熱ローラ。1. A heating roller comprising a cylindrical or cylindrical roller support, an electric heating layer formed on the surface of the roller support, and a surface layer formed on the outer periphery of the electric heating layer. The diameter of the roller support is 25 mm or less,
A heating roller, wherein the thickness of the heat generating layer is 0.8 mm or less, and the thermal conductivity of the roller support is 0.005 cal / cm · sec · ° C. or less.
スルフィド、ポリエーテルスルホン、ポリエーテルエー
テルケトン、フェノール樹脂等の耐熱性樹脂か又は当該
樹脂から成るコンポジット、或いはセラミックスからな
ることを特徴とする請求項１記載の加熱ローラ。2. The heating roller support is made of a heat-resistant resin such as polyphenylene sulfide, polyether sulfone, polyether ether ketone, and phenol resin, or a composite of the resin, or ceramics. The heating roller described.
ーテイング液またはシリコンワニス液またはポリイミド
ワニスに分散させたものであることを特徴とする請求項
１及び２記載の加熱ローラ。3. The heating roller according to claim 1, wherein the electrically conductive heat generating layer is formed by dispersing conductive powder in an inorganic coating liquid, a silicon varnish liquid, or a polyimide varnish.
潤滑性粉体を分散させた無機コーテイング液、シリコン
ワニス液又はポリイミドワニス液であることを特徴とす
る請求項１乃至３記載の加熱ローラ。4. The heating roller according to claim 1, wherein the surface layer is an inorganic coating liquid, a silicon varnish liquid or a polyimide varnish liquid in which a fluororesin coating material and / or a lubricating powder is dispersed. .
の間にトナーの付着した転写紙を通すことにより、トナ
ーを転写紙に定着する電子写真装置の熱定着装置におい
て、前記加熱ローラが請求項１乃至４記載の加熱ローラ
であることを特徴とする電子写真装置の熱定着装置。5. A heat fixing device of an electrophotographic apparatus, which fixes toner on a transfer paper by passing the transfer paper on which the toner adheres between a heating roller and a pressure roller that generate heat by energization. Item 6. A heat fixing device for an electrophotographic apparatus, which is the heating roller according to any one of items 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25255394A JPH08115783A (en) | 1994-10-18 | 1994-10-18 | Heating roller and thermally fixing apparatus of electrophotographic apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25255394A JPH08115783A (en) | 1994-10-18 | 1994-10-18 | Heating roller and thermally fixing apparatus of electrophotographic apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08115783A true JPH08115783A (en) | 1996-05-07 |
Family
ID=17238978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25255394A Pending JPH08115783A (en) | 1994-10-18 | 1994-10-18 | Heating roller and thermally fixing apparatus of electrophotographic apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08115783A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6122479A (en) * | 1996-02-16 | 2000-09-19 | Ricoh Company | Fixing device for an image forming apparatus and fixing roller for the same |
| KR20140019899A (en) * | 2012-08-06 | 2014-02-18 | 삼성전자주식회사 | Fusing unit and image forming apparatus using the same |
-
1994
- 1994-10-18 JP JP25255394A patent/JPH08115783A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6122479A (en) * | 1996-02-16 | 2000-09-19 | Ricoh Company | Fixing device for an image forming apparatus and fixing roller for the same |
| KR20140019899A (en) * | 2012-08-06 | 2014-02-18 | 삼성전자주식회사 | Fusing unit and image forming apparatus using the same |
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