JPH1020690A - Fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high performance fixing device adaptable even to the color image forming device and capable of improving thermal efficiency with a simple constitution and shortening the temp. rising time by providing a good thermal conductors (radiating boards) inside a releasing layer of a fixing roller. SOLUTION: The surface temp. of fixing rollers R and R' are kept constant by providing a thermistor 9 being temp. detecting means close to or in contact with at least one surface of the fixing rollers R and R' and controlling a temp. adjusting circuit 21 by a signal from the thermistor 9 by means of heat controlling a heating source 2. In the fixing rollers R and R', a core bar 1 is made of aluminum, and provided with a halogen heater of 450W as the heating source 2 inside a hollow cylinder. The radiating boards 3 are arranged on the outside the core bar 1. The radiating boards 3 are composed by using the same material as the core bar 1 for instance, the number of 500 sheets with 2mm length, 0.1 thickness and arranging in slant at the height of 1.7mm from the periphery of the core bar 1, and moreover dappling with silicone rubber on a releasing layer 4 of 0.2mm.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は画像形成装置用の熱
定着装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat fixing device for an image forming apparatus.

【０００２】[0002]

【従来の技術】電子写真に使用される定着装置には、図
７に示すように少なくとも一方が加熱源２を有する一対
のローラＲ、Ｒ′が互いに圧接回転する熱定着装置が一
般に使用される。2. Description of the Related Art As a fixing device used in electrophotography, as shown in FIG. 7, a heat fixing device in which a pair of rollers R and R 'having at least one of which has a heating source 2 is rotated by pressing against each other is generally used. .

【０００３】ローラは通常金属（アルミニュウムや鉄等
あるいは金属合金）等の良熱伝導体で作成された芯金
１、１′上にトナーとの離型性が良く、耐熱性に優れた
シリコンゴム、パーフルオロアルコキシアルカン樹脂
（ＰＦＡ）、ポリテトラフルオロエチレン（ＰＴＦＥ）
等が弾性機能を持たせた離型層４として表面被覆されて
いる（この離型層４は一層構成ではなく、弾性機能と離
型層を分離した二層構成、乃至は二層以上の構成でも可
能である）。The roller is made of silicon rubber which has good releasability from toner and excellent heat resistance on cores 1 and 1 'which are usually made of a good heat conductor such as metal (aluminum, iron or metal alloy). , Perfluoroalkoxy alkane resin (PFA), polytetrafluoroethylene (PTFE)
Are coated as a release layer 4 having an elastic function (the release layer 4 is not a single layer, but has a two-layer structure in which the elastic function and the release layer are separated, or a structure of two or more layers. But it is possible).

【０００４】これらのローラＲ、Ｒ′表面の少なくとも
一方には、温度検出手段としてサーミスタ９が近接乃至
は接触し、サーミスタから信号で温度調整回路２１を制
御し、前記加熱源２を温度制御することでローラＲ、
Ｒ′表面の温度を一定に保つ。A thermistor 9 as a temperature detecting means approaches or contacts at least one of the surfaces of the rollers R and R ', and controls a temperature adjusting circuit 21 by a signal from the thermistor to control the temperature of the heating source 2. By the roller R,
The temperature of the R 'surface is kept constant.

【０００５】定着装置は、このローラ間に電子写真で得
られた粉体トナー像Ｔを有する転写紙Ｐを通過させるこ
とで転写紙Ｐ上のトナーＴを固着定着させるように構成
されている。The fixing device is configured to fix and fix the toner T on the transfer paper P by passing a transfer paper P having a powder toner image T obtained by electrophotography between the rollers.

【０００６】[0006]

【発明が解決しようとしている課題】しかしながら、上
記従来例では転写紙が定着装置（定着ローラ間）を通過
する際、定着ローラ表面の熱をも定着装置外に持ち出
し、定着ローラの表面温度が下げられるため、次のよう
な欠点が生じた。However, in the above conventional example, when the transfer paper passes through the fixing device (between the fixing rollers), the heat of the surface of the fixing roller is also taken out of the fixing device, and the surface temperature of the fixing roller decreases. As a result, the following drawbacks have occurred.

【０００７】（１）定着ローラが１周した後再度定着ロ
ーラＲ、Ｒ′表面が転写紙Ｐに接触すると、上述したよ
うに定着ローラ表面温度が低下するため、定着ローラ１
周以降でトナーが転写紙上に固着固定されない未定着画
像が発生する。また、複数の異なる色のトナーを重ね合
わせるカラー定着装置では、定着ローラ１周目と２周目
との間で色目が異なる不都合が生じる。(1) When the surfaces of the fixing rollers R and R 'come into contact with the transfer paper P again after the fixing roller makes one rotation, the surface temperature of the fixing roller decreases as described above.
An unfixed image in which the toner is not fixed and fixed on the transfer paper occurs after the circumference. Further, in a color fixing device in which a plurality of toners of different colors are superimposed, there is a disadvantage that the color differs between the first and second rotations of the fixing roller.

【０００８】（２）また、定着ローラＲ、Ｒ′表面へ熱
伝導を良好にするために離型層４を薄くすると、図８は
図７矢印Ａ方向から見た図で図８（Ａ）に示すように、
画像の薄い（トナー乗り量が少ない）部分は定着が十分
行われない。これは、転写紙Ｐ上のトナーＴと定着ロー
ラＲ、Ｒ′表面が十分接触しないためと考えられる。(2) When the release layer 4 is made thinner in order to improve heat conduction to the surfaces of the fixing rollers R and R ', FIG. 8 is a view seen from the direction of arrow A in FIG. As shown in
Fixing is not sufficiently performed on a thin portion of the image (the amount of toner applied is small). This is considered because the toner T on the transfer paper P and the surfaces of the fixing rollers R and R 'do not sufficiently contact each other.

【０００９】特に、周囲に画像の濃い部分が有ると顕著
に現われる。また、複数のトナーを重ね合せるカラー画
像で顕著に現われ、特にＯＨＴ（オーバ・ヘッド・プロ
ジェクト用記録シート）上のカラートナー定着で顕著に
現われ、このＯＨＴをＯＨＰで投影すると画像輪郭が黒
ずむ（疑似輪郭）。これに対して、図８（Ｂ）に示すよ
うに離型層を厚くすればよいが、（１）の問題が生じ
る。[0009] In particular, when there is a dark portion of the image in the surroundings, it appears remarkably. In addition, it appears remarkably in a color image in which a plurality of toners are superimposed, and particularly in fixing a color toner on an OHT (overhead project recording sheet). Contour). On the other hand, the thickness of the release layer may be increased as shown in FIG. 8B, but the problem (1) occurs.

【００１０】（３）上記（１）を解決するために定着ロ
ーラＲ、Ｒ′の加熱源２を大加熱容量のものにする必要
がある。加熱源２の容量が大きくなると画像形成装置が
大型化したり、加熱源２がＯＮ／ＯＦＦして温度制御す
る度に周囲の電気機具の誤動作が生じる等不都合が生じ
る。(3) In order to solve the above (1), the heating source 2 of the fixing rollers R and R 'needs to have a large heating capacity. When the capacity of the heating source 2 is large, inconveniences such as an increase in the size of the image forming apparatus and malfunctions of surrounding electric equipment occur each time the heating source 2 is turned ON / OFF to control the temperature.

【００１１】（４）また、加熱源２の容量を増大させる
と、前記芯金１が昇温し、芯金１と離型層４が剥離する
等の不都合が生じる。(4) When the capacity of the heating source 2 is increased, the core metal 1 rises in temperature, and the core metal 1 and the release layer 4 are separated from each other.

【００１２】[0012]

【課題を解決するための手段】本発明は、未定着像を有
する記録材を定着部材により加熱及び加圧して定着を行
う定着装置において、定着部材の離型層内側に良熱伝導
体を有することを特徴とする定着装置である。According to the present invention, there is provided a fixing device for fixing a recording material having an unfixed image by heating and pressing with a fixing member, wherein a good heat conductor is provided inside a release layer of the fixing member. A fixing device characterized in that:

【００１３】また、本発明は、未定着像を有する記録材
を定着部材により加熱及び加圧して定着を行う定着装置
において、定着部材の離型層が良熱伝導体を含有するこ
とを特徴とする定着装置である。According to the present invention, in a fixing device for fixing a recording material having an unfixed image by heating and pressing with a fixing member, the release layer of the fixing member contains a good heat conductor. Fixing device.

【００１４】本発明においては、上記構成により定着部
材表面への熱伝導性を改良している。In the present invention, the heat conductivity to the surface of the fixing member is improved by the above configuration.

【００１５】[0015]

【発明の実施の形態】BEST MODE FOR CARRYING OUT THE INVENTION

［実施例１］図１は本発明の第１の実施例を示し、芯金
１はアルミニュウム製で外径３６．０ｍｍ、内径３１．
０ｍｍの中空円筒で長手方向に巾２３０ｍｍで形成され
る。中空円筒内部には加熱源２として４５０Ｗのハロゲ
ンヒータを有している。Embodiment 1 FIG. 1 shows a first embodiment of the present invention, in which a metal core 1 is made of aluminum and has an outer diameter of 36.0 mm and an inner diameter of 31.0 mm.
It is a hollow cylinder of 0 mm and formed with a width of 230 mm in the longitudinal direction. A 450 W halogen heater is provided as a heating source 2 inside the hollow cylinder.

【００１６】芯金１の外側には放熱板３が配設されてい
る。放熱板３は５００枚を図１に示すように長さ２ｍ
ｍ、厚さ０．１ｍｍで芯金１と同一材料を使用し、芯金
１の外周面から１．７ｍｍの高さに斜めに配置し、更に
２．０ｍｍの離型層４をシリコンゴムをディピングして
形成する。A heat radiating plate 3 is provided outside the metal core 1. The heat radiating plate 3 has a length of 2 m as shown in FIG.
m, using the same material as the core 1 with a thickness of 0.1 mm, disposed obliquely at a height of 1.7 mm from the outer peripheral surface of the core 1, and further forming a 2.0 mm release layer 4 with silicone rubber. It is formed by dipping.

【００１７】以上の構成の定着ローラを図２の画像形成
装置で組み合わせて画像形成したが、上述の不都合は認
められなかった。An image was formed by combining the fixing roller having the above-mentioned configuration with the image forming apparatus shown in FIG. 2, but the above-mentioned inconvenience was not recognized.

【００１８】以下、図２で具体的に説明する。Hereinafter, a specific description will be given with reference to FIG.

【００１９】図２の画像形成装置は複数色のトナーを使
用してカラー画像を得る方法で、この種の画像形成装置
は、特開昭５０−５０９３５号公報等に記載されてい
る。The image forming apparatus shown in FIG. 2 is a method for obtaining a color image using a plurality of color toners. This type of image forming apparatus is described in Japanese Patent Application Laid-Open No. 50-50935.

【００２０】感光ドラム１１は直径４０ｍｍのアルミニ
ュウムシリンダ１２上に有機感光体（ＯＰＣ）からなる
光導電体１３を塗布して構成され矢印方向に毎秒１００
ｍｍで移動される。前述ＯＰＣはＡ−Ｓｉ、ＣｄＳ、Ｓ
ｅ等でもよい。この表面層を従来公知のコロナ帯電器１
４により均一帯電され、次に従来公知のレーザダイオー
ド、回転多面鏡、折り返しミラー等（図示せず）の構成
で光学系１５が構成される。光学系１５にはイエローの
画像模様に従った電気信号が入力され光Ｅに変換され感
光ドラム１１上に照射される。感光ドラム１１は静電潜
像が形成される。次に、イエロー現像１６Ｙでイエロー
トナーで可視化される。更に、感光ドラム１１上のイエ
ロートナー像は転写紙カセット１７内から転写紙Ｐが給
紙され転写ローラ１８上に吸着される。転写ローラ１８
は、直径１５６ｍｍの金属シリンダ１９に厚さ２ｍｍの
抵抗を有するイノアック（メーカー名）製の発泡ウレタ
ンを弾性層２０とし、更に上層には厚さ１００ミクロン
のポリフッ化ビニリデン（ＰＶｄＦ）を誘電体層２１と
して巻つけて構成される。The photosensitive drum 11 is formed by coating a photoconductor 13 made of an organic photosensitive member (OPC) on an aluminum cylinder 12 having a diameter of 40 mm, and is formed in a direction indicated by an arrow at a rate of 100 per second.
mm. The OPC is A-Si, CdS, S
e or the like. This surface layer is applied to a conventionally known corona charger 1
Then, the optical system 15 is configured by a conventionally known laser diode, rotating polygon mirror, folding mirror and the like (not shown). An electrical signal according to a yellow image pattern is input to the optical system 15, converted into light E, and emitted onto the photosensitive drum 11. An electrostatic latent image is formed on the photosensitive drum 11. Next, it is visualized with yellow toner in yellow development 16Y. Further, the transfer paper P is fed from the transfer paper cassette 17 and the yellow toner image on the photosensitive drum 11 is attracted to the transfer roller 18. Transfer roller 18
Is a metal cylinder 19 having a diameter of 156 mm, a urethane foam made by Inoac (manufacturer) having a resistance of 2 mm as an elastic layer 20, and a 100 micron thick polyvinylidene fluoride (PVdF) as a dielectric layer on the upper layer. 21 is wound around.

【００２１】転写ローラ１８には、感光ドラム１１上の
トナーが転写紙Ｐに転写されるようにトナー極性と逆の
転写電圧が印加され（不図示）、トナーは転写紙上に転
写される。以上の工程をマゼンタ色、シアン色、黒色
（現像器はその都度マゼンタ現像１６Ｍ、シアン現像１
６Ｃ、黒現像１６Ｂｋに切り替わる）を行うことによっ
て転写紙Ｐ上にはカラー画像が形成される。The transfer roller 18 is applied with a transfer voltage (not shown) opposite to the polarity of the toner so that the toner on the photosensitive drum 11 is transferred to the transfer paper P, and the toner is transferred onto the transfer paper. The above steps were repeated for magenta, cyan, and black (the developing units were 16 M for magenta development and 1 for cyan development, respectively).
6C and black development 16Bk), a color image is formed on the transfer paper P.

【００２２】また、感光ドラム１１上の転写残トナーは
公知のファーブラシ、ブレード等のクリーニング装置２
２によって清掃される。The residual toner on the photosensitive drum 11 is transferred to a cleaning device 2 such as a well-known fur brush or blade.
2 to be cleaned.

【００２３】転写紙Ｐ上の画像は図１のローラを一対に
した定着装置で加圧、加熱されトナーは定着される。定
着画像はＡ４サイズ等大画面でも光沢差が無く、かつ、
ＯＨＴ等の転写紙Ｐに記録しても疑似輪郭が無い画像を
形成できる。The image on the transfer paper P is pressed and heated by a fixing device having a pair of rollers shown in FIG. 1 to fix the toner. The fixed image has no gloss difference even on a large screen such as A4 size, and
Even if the image is recorded on the transfer paper P such as OHT, an image having no false contour can be formed.

【００２４】理由は放熱板３の熱伝導が良く、かつ定着
時に放熱板３が薄いために離型層４に追従されると推定
される。なお、前記放熱板３を細い針状に形成し芯金１
の中心から見て放射状に配置しても同様な効果が認めら
れた。It is presumed that the reason is that the heat radiation plate 3 has good heat conduction and is fixed to the release layer 4 because the heat radiation plate 3 is thin at the time of fixing. The heat sink 3 is formed in a thin needle shape and
A similar effect was observed even when radially arranged as viewed from the center.

【００２５】図３は図１、図２を具体的に説明する図
で、画像形成装置内でのローラ表面温度を測定したグラ
フで、横軸には時間（分）、縦軸には表面温度（℃）を
表わしている。FIG. 3 is a diagram specifically illustrating FIGS. 1 and 2 and is a graph in which the roller surface temperature in the image forming apparatus is measured. The horizontal axis represents time (minutes), and the vertical axis represents the surface temperature. (° C.).

【００２６】また、図３中、曲線ａは図１のローラ表面
温度、曲線ｂは図１で放熱板３が無い従来例のローラ表
面温度上昇を表わしたものである。曲線ａ、ｂの違いは
検討の結果、放熱板３と離型層４との熱伝導率の違いが
あることが解った。In FIG. 3, curve a represents the roller surface temperature in FIG. 1, and curve b represents the rise in the roller surface temperature of the conventional example in FIG. Examination of the difference between the curves a and b revealed that there was a difference in the thermal conductivity between the heat sink 3 and the release layer 4.

【００２７】以下説明すると、離型層４として通常はシ
リコンゴム等を使用し、熱伝導率ｋが０．１〜０．６Ｗ
／ｍ・Ｋであるのに対して金属等の熱伝導率ｋは２００
〜４００Ｗ／ｍ・Ｋと、５００〜１０００倍の違いが見
られた。本発明では離型層４にＩＳＴ（株）から供給さ
れた２液性ＬＴＶシリコンゴム（熱伝導率：０．１３Ｗ
／ｍ・Ｋ）を使用、芯金１及び放熱板３には工業Ｎｏ：
Ａ６０６３のアルミニュウム合金（熱伝導率：２１７Ｗ
／ｍ・Ｋ）を使用した。In the following description, normally, silicone rubber or the like is used as the release layer 4 and the thermal conductivity k is 0.1 to 0.6 W.
/ M · K, whereas the thermal conductivity k of a metal or the like is 200
４００400 W / m · K, and a difference of 500 to 1000 times was observed. In the present invention, the two-component LTV silicone rubber (thermal conductivity: 0.13 W) supplied from IST Co., Ltd.
/ M · K).
A6063 aluminum alloy (thermal conductivity: 217W)
/ MK).

【００２８】以上説明したように、芯金１の外周に弾性
を有する放熱板３を設けるという簡単な方法で定着画像
の光沢差が無く、疑似輪郭等をも低減できる。As described above, there is no difference in gloss of the fixed image and the pseudo contour can be reduced by a simple method of providing the heat radiating plate 3 having elasticity on the outer periphery of the metal core 1.

【００２９】また、近年ローラの代わりに、転写紙Ｐと
同期して移動する耐熱性樹脂からなる薄い円筒フイルム
を介して固定加熱源と組み合わせたＳＵＲＦ定着方式の
提案（特公昭５３−１７０６１号公報）や、上述ＳＵＲ
Ｆ定着加熱源の代わりに電磁誘導加熱によって薄い強磁
性円筒フイルムを直接加熱して定着する方法も提案され
ており（特開平４−１６６９６６号公報）、昇温速度も
速く熱効率が良いという利点を有しているが、フイルム
の耐久性や複数の画像を重ねたカラー画像を定着する場
合には疑似輪郭が生じる等の不都合があった。Further, in recent years, a SURF fixing method combining a fixed heating source via a thin cylindrical film made of a heat-resistant resin which moves in synchronization with the transfer paper P instead of a roller has been proposed (Japanese Patent Publication No. 53-17061). ) Or the above SUR
A method of directly heating and fixing a thin ferromagnetic cylindrical film by electromagnetic induction heating instead of the F-fixing heating source has also been proposed (Japanese Patent Laid-Open No. 4-166966). However, when fixing a color image in which a plurality of images are superimposed, there are disadvantages such as generation of false contours.

【００３０】［実施例２］図４の基本構成は図１、図２
と同様である。図４の芯金１の外周には強磁性粒子５と
して直径０．１ｍｍのパーマロイ（鉄−ニッケル合金）
を５０重量％を分散させた膜厚１．８ｍｍのシリコンゴ
ム層をデッピングにより形成し、更に外表面に離型層４
として膜厚０．１ｍｍのシリコンゴム層をデッピングに
より形成し、この表面側から特開平４−１６６９６６公
報に開示された長尺状電磁石を電磁誘導加熱源６として
直接強磁性粒子５を加熱しても、実施例１と同様な特性
が得られることが判明した。また、芯金１は熱伝導の少
ない樹脂、無機物質等で形成すると熱効率の良い結果が
得られた。Embodiment 2 FIGS. 1 and 2 show the basic configuration of FIG.
Is the same as Permalloy (iron-nickel alloy) having a diameter of 0.1 mm as ferromagnetic particles 5 is provided on the outer periphery of the core metal 1 in FIG.
Is formed by dipping a silicon rubber layer having a thickness of 1.8 mm in which 50% by weight is dispersed, and a release layer 4 is formed on the outer surface.
A silicon rubber layer having a thickness of 0.1 mm is formed by dipping, and the ferromagnetic particles 5 are directly heated from the surface side by using a long electromagnet disclosed in JP-A-4-166966 as an electromagnetic induction heating source 6. It was also found that the same characteristics as in Example 1 were obtained. Further, when the cored bar 1 is formed of a resin, an inorganic substance, or the like having a low thermal conductivity, a result with good thermal efficiency was obtained.

【００３１】［実施例３］図５の基本構成は図１、図４
と同様である。図５の芯金１内には加熱源２が、芯金１
の外周には直径０．２ｍｍの銀、銅、アルミニュウムや
グラファイト炭素等の良熱伝導粒子７を分散させたシリ
コンゴム層を形成し、更に外表面に離型層４としてシリ
コンゴム層を形成しても、実施例１と同様な効果が得ら
れることが判明した。また、図４の電磁誘導加熱源６を
芯金１内に収容し、かつ良熱伝導粒子７の代わりに強磁
性粒子５を分散させても同様な効果が得られた。[Embodiment 3] FIGS. 1 and 4 show the basic configuration of FIG.
Is the same as A heating source 2 is provided in the core 1 shown in FIG.
A silicon rubber layer in which good heat conductive particles 7 such as silver, copper, aluminum and graphite carbon having a diameter of 0.2 mm are dispersed is formed on the outer periphery of the silicon rubber layer, and a silicon rubber layer is formed as a release layer 4 on the outer surface. Also, it was found that the same effect as in Example 1 was obtained. The same effect was obtained when the electromagnetic induction heating source 6 of FIG. 4 was accommodated in the cored bar 1 and the ferromagnetic particles 5 were dispersed instead of the good heat conductive particles 7.

【００３２】［実施例４］図６は更に特公昭５３−１７
０６１号公報及び特開平４−１６６９７７号公報の不都
合を改良した装置で、ベルト状のポリイミド等の樹脂フ
イルム８の外表面に、離型層４として良熱伝導粒子７を
分散させたシリコンゴム層を塗工により形成し、樹脂フ
イルム８側より加熱源２を密着乃至は近接させても、実
施例１と同様な効果が得られた。また、図６の良熱伝導
粒子７の代わりに強磁性粒子５を分散させかつ樹脂フイ
ルム８側より電磁誘導加熱源６により直接強磁性粒子５
を加熱しても同様な効果が得られた。[Embodiment 4] FIG. 6 further shows Japanese Patent Publication No. 53-17 / 1983.
No. 061 and JP-A-4-166977, a silicon rubber layer in which good heat conductive particles 7 are dispersed as a release layer 4 on the outer surface of a resin film 8 such as a belt-like polyimide. Was formed by coating, and the same effect as in Example 1 was obtained when the heating source 2 was brought into close contact with or near the resin film 8 side. Also, the ferromagnetic particles 5 are dispersed in place of the good heat conducting particles 7 in FIG.
The same effect was obtained by heating.

【００３３】[0033]

【発明の効果】以上説明したように、熱伝導の良い材料
を離型層内側に挿入あるいは離型層に分散させるか、強
磁性体を離型層内側に挿入あるいは離型層に分散させる
という簡単な方法により、熱効率を向上させ、昇温時間
を短縮させ、かつカラー画像形成装置まで適用できる高
性能な定着装置を提供できる。As described above, a material having good heat conductivity is inserted inside the release layer or dispersed in the release layer, or a ferromagnetic material is inserted inside the release layer or dispersed in the release layer. By a simple method, it is possible to provide a high-performance fixing device that improves thermal efficiency, shortens the time required for temperature rise, and can be applied to a color image forming apparatus.

【００３４】また、芯金１と良熱伝導体等を接合した場
合、離型層と芯金の接着強度も高めることができる。When the core 1 and the good heat conductor are joined, the adhesive strength between the release layer and the core can be increased.

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

【図１】本発明を説明するための定着装置の断面図。FIG. 1 is a sectional view of a fixing device for explaining the present invention.

【図２】図１の定着装置を有する画像形成装置の概略構
成図。FIG. 2 is a schematic configuration diagram of an image forming apparatus having the fixing device of FIG.

【図３】従来の定着装置と本発明定着装置の温度立上が
り特性図。FIG. 3 is a temperature rise characteristic diagram of a conventional fixing device and a fixing device of the present invention.

【図４】本発明の他の実施例の定着装置の断面図。FIG. 4 is a sectional view of a fixing device according to another embodiment of the present invention.

【図５】本発明の他の実施例の定着装置の断面図。FIG. 5 is a sectional view of a fixing device according to another embodiment of the present invention.

【図６】本発明の他の実施例の定着装置の断面図。FIG. 6 is a sectional view of a fixing device according to another embodiment of the present invention.

【図７】従来の定着装置。FIG. 7 shows a conventional fixing device.

【図８】転写紙を定着している様子で、（Ａ）は離型層
の薄い状態、（Ｂ）は離型層の厚い様子を表わす。8A and 8B show a state in which the transfer paper is fixed, wherein FIG. 8A shows a state where the release layer is thin, and FIG. 8B shows a state where the release layer is thick.

【符号の説明】[Explanation of symbols]

２ 放熱源 ３ 放熱板（良熱伝導体） ４ 離型層 ５ 強磁性粒子（強磁性粒体） ６ 電磁誘導加熱源 ６ 良熱伝導粒子（良熱伝導体） 2 heat radiating source 3 heat radiating plate (good heat conductor) 4 release layer 5 ferromagnetic particles (ferromagnetic particles) 6 electromagnetic induction heating source 6 good heat conducting particles (good heat conductor)

Claims (8)

【特許請求の範囲】[Claims] 【請求項１】 未定着像を有する記録材を定着部材によ
り加熱及び加圧して定着を行う定着装置において、少な
くとも一方の定着部材の少なくとも一層以上の離型層内
部に良熱伝導体を有することを特徴とする定着装置。1. A fixing device for fixing a recording material having an unfixed image by heating and pressurizing with a fixing member, wherein at least one of the fixing members has a good heat conductor inside at least one or more release layers. A fixing device. 【請求項２】 良熱伝導体の熱伝導率が、離型層の熱伝
導率の５００倍以上である請求項１記載の定着装置。2. The fixing device according to claim 1, wherein the thermal conductivity of the good thermal conductor is at least 500 times the thermal conductivity of the release layer. 【請求項３】 互いに圧接する一対の回転体と、少なく
とも一方の回転体を加熱する加熱体とを有する請求項１
記載の定着装置。3. The apparatus according to claim 1, further comprising: a pair of rotating bodies that press against each other, and a heating body that heats at least one of the rotating bodies.
The fixing device as described in the above. 【請求項４】 良熱伝導体の代わりに強磁性体を有し、
該強磁性体に電磁界を及びぼす範囲内に電磁界発生装置
を有する請求項１記載の定着装置。4. It has a ferromagnetic material instead of a good heat conductor,
The fixing device according to claim 1, further comprising an electromagnetic field generator within a range where the electromagnetic field is applied to the ferromagnetic material. 【請求項５】 未定着像を有する記録材を定着部材によ
り加熱及び加圧して定着を行う定着装置において、定着
部材の離型層が良熱伝導体を含有することを特徴とする
定着装置。5. A fixing device for fixing a recording material having an unfixed image by heating and pressing with a fixing member, wherein the release layer of the fixing member contains a good heat conductor. 【請求項６】 良熱伝導体の熱伝導率が、良熱伝導体を
含有させる離型層の熱伝導率の５００倍以上である請求
項５記載の定着装置。6. The fixing device according to claim 5, wherein the thermal conductivity of the good thermal conductor is at least 500 times the thermal conductivity of the release layer containing the good thermal conductor. 【請求項７】 定着部材がベルト形状である請求項５記
載の定着装置。7. The fixing device according to claim 5, wherein the fixing member has a belt shape. 【請求項８】 良熱伝導体の代わりに強磁性体を含有
し、該強磁性体に磁界を及びぼす範囲内に電磁界発生源
を有する請求項５記載の定着装置。8. The fixing device according to claim 5, wherein a ferromagnetic material is contained instead of the good thermal conductor, and an electromagnetic field source is provided within a range in which a magnetic field is applied to the ferromagnetic material.