JPH0566688A - Heating device - Google Patents

Abstract

PURPOSE:To prevent the displacement of a film in a width direction and the occurrence of wrinkles on the film caused due to the temperature rising at non-paper passing part in a heating body by providing a specified heat accumulative and heat conductive member in the longitudinal direction of the heating body. CONSTITUTION:The heating body 20 is provided so that the heat accumulative and heat conductive member 30 made of metal such as Al, etc., having heat capacity in some degree and whose heat conductivity is high may be formed on the whole length of a heater substrate in the longitudinal direction with the thickness of, for example, 0.5-3mm through a glass layer as an insulating layer 29 between the heater substrate surface where the heat generating body 22 is formed and the heat generating body 22. And electric conduction is executed by the heating body 20 to the heat generating body 22 in a linear shape, or a belt-like shape through both end parts of the body in the longitudinal direction, and the heat is generated on the nearly whole length of the heat generating body 22. Electric conduction is executed by AC/100V, and power conduction is controlled by controlling a phase angle for conduction by a conduction control circuit including a triac in accordance with the temperature detected by a temperature detecting element 23.

Description

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

【０００１】[0001]

【産業上の利用分野】本発明は、耐熱性フィルムの一面
側に加熱体を、他面側に被加熱材を密着させ、前記耐熱
性フィルムを介して加熱体の熱エネルギーを被加熱材に
付与する方式（フィルム加熱方式）の加熱装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-resistant film having a heating body adhered to one side thereof and a heat-resistant material to the other side thereof, and the heat energy of the heating body is applied to the heat-resistant material through the heat-resistant film. The present invention relates to a heating device of a giving method (film heating method).

【０００２】この装置は、電子写真複写機・プリンタ・
ファックス等の画像形成装置における画像加熱定着装
置、即ち電子写真・静電記録・磁気記録等の適宜の画像
形成プロセス手段により加熱溶融性の樹脂等により成る
トナーを用いて記録材（エレクトロファックスシート・
静電記録シート・転写材シート・印刷紙など）の面に直
接方式もしくは間接（転写）方式で形成した、目的の画
像情報に対応した未定着のトナー画像を該画像を担持し
ている記録材面に永久固着画像として加熱定着処理する
装置として活用できる。This device is an electrophotographic copying machine, printer,
An image heating and fixing device in an image forming apparatus such as a fax, that is, a recording material (electrofax sheet, toner, etc.) made of a heat-meltable resin by an appropriate image forming process means such as electrophotography, electrostatic recording and magnetic recording.
A recording material carrying an unfixed toner image corresponding to the target image information formed on the surface of an electrostatic recording sheet, transfer material sheet, printing paper, etc. by a direct method or an indirect (transfer) method. It can be used as a device for heat fixing processing as a permanently fixed image on the surface.

【０００３】また、例えば、画像を担持した記録材を加
熱して表面性（艶など）を改質する装置、仮定着処置す
る装置等、広く被加熱材を加熱処理する手段・装置とし
て使用できる。Further, for example, it can be widely used as a means for heating a material to be heated, such as an apparatus for heating a recording material carrying an image to modify the surface property (gloss, etc.), an apparatus for presumptive treatment, and the like. ..

【０００４】[0004]

【従来の技術】従来、例えば画像の加熱定着等のための
記録材の加熱装置としては、所定の温度に維持された加
熱ローラと、弾性層を有して前記加熱ローラに圧接する
加圧ローラによって記録材を挟持搬送しつつ加熱する熱
ローラ方式が多用されている。またフラッシュ加熱方
式、オーブン加熱方式、熱板加熱方式など種々の方式・
構成のものが知られており、また実用されている。2. Description of the Related Art Conventionally, as a heating device of a recording material for heating and fixing an image, for example, a heating roller maintained at a predetermined temperature and a pressure roller having an elastic layer and being in pressure contact with the heating roller. A heat roller method is widely used in which a recording material is nipped and conveyed while being heated. Various methods such as flash heating method, oven heating method, hot plate heating method, etc.
The configuration is known and is in practical use.

【０００５】また、米国特許第３，５７８，７９７号明
細書に開示のように、ベルト加熱方式のものも知られて
いる。これは、 ．トナー像を加熱体ウェブに接触させてその融点へ加
熱して融解し、 ．融解後、そのトナーを冷却して比較的高い粘性と
し、 ．トナーの加熱体ウェブへ付着する傾向を弱めた状態
で加熱体ウェブから剥がす という過程で、オフセットを生じさせずに定着処理する
方式である。A belt heating type is also known, as disclosed in US Pat. No. 3,578,797. this is, . Fusing the toner image by contacting it with a heating element web and heating to its melting point; After melting, the toner is cooled to a relatively high viscosity ,. In this process, the fixing process is performed without causing offset in the process of peeling the toner from the heating body web while weakening the tendency of the toner to adhere to the heating body web.

【０００６】最近では、固定支持された加熱体（サーマ
ルヒータ、以下ヒータと記す）と、該ヒータに対向圧接
しつつ搬送される耐熱性フィルム（定着フィルム）と、
該フィルムを介して記録材をヒータに密着させる加圧部
材を有し、ヒータの熱をフィルムを介して記録材へ付与
することで記録材面に形成担持されている未定着画像を
記録材面に加熱定着させる方式・構成の定着装置（フィ
ルム加熱方式）が考案されている。Recently, a fixedly supported heater (thermal heater, hereinafter referred to as a heater), a heat-resistant film (fixing film) conveyed while being pressed against the heater,
An unfixed image formed and carried on the surface of the recording material is formed on the surface of the recording material by applying heat of the heater to the recording material through the film. A fixing device (film heating method) having a method and structure for heating and fixing to a sheet has been devised.

【０００７】本出願人の先の提案に係る例えば特開昭６
３−３１３１８２号公報に開示の方式・装置等がこれに
属し、薄肉の無端或は有端の耐熱性フィルム（シート）
と、該フィルムの移動駆動手段と、該フィルムを中にし
てその一方面側に固定支持して配されたヒータと、他方
面側に該ヒータに対向して配置され該ヒータに対して該
フィルムを介して画像定着するべき記録材の顕画像担持
面を密着させる加圧部材を有し、該フィルムは少なくと
も画像定着時は該フィルムと加圧部材との間に搬送導入
される画像定着すべき記録材と順方向に同一速度で走行
移動させて該走行移動フィルムを挟んでヒータと加圧部
材との圧接で形成される定着部としての定着ニップ部を
通過させることにより該記録材の顕画像担持面を該フィ
ルムを介して該ヒータで加熱して顕画像（未定着トナー
像）に熱エネルギーを付与して軟化・溶融せしめ、次い
で定着部通過後のフィルムと記録材を分離点で離間させ
ることを基本とする加熱手段・装置である。According to the applicant's earlier proposal, for example, Japanese Patent Laid-Open No.
The method and apparatus disclosed in Japanese Patent Laid-Open No. 3-313182 belong to this, and a thin endless or endless heat resistant film (sheet).
A moving drive means for the film, a heater fixedly supported on one side of the film with the film in the middle, and a heater disposed on the other side of the film so as to face the heater. The film has a pressure member for closely contacting the developed image bearing surface of the recording material to be image-fixed, and the film is conveyed and introduced between the film and the pressure member at least during image fixing. A visible image of the recording material by running and moving in the forward direction at the same speed as the recording material and passing through a fixing nip portion as a fixing portion formed by press contact between a heater and a pressing member with the traveling moving film interposed therebetween. The supporting surface is heated by the heater through the film to apply thermal energy to the developed image (unfixed toner image) to soften / melt it, and then the film and recording material after passing through the fixing portion are separated at the separation point. Based on A heating means and equipment.

【０００８】このようなフィルム加熱方式においては、
ヒータとして低熱容量加熱体を用いることができる。こ
のため、従来の接触加熱方式である熱ローラ方式、ベル
ト加熱方式などに比べ省電力化及びウェイトタイム短縮
化（クイックスタート）が可能となる。その他、従来の
加熱方式の欠点を解決できる利点を有し、効果的なもの
である。In such a film heating system,
A low heat capacity heating element can be used as the heater. Therefore, it is possible to save power and shorten the wait time (quick start) as compared with the conventional contact heating method such as a heat roller method and a belt heating method. In addition, it has an advantage that the drawbacks of the conventional heating method can be solved, and is effective.

【０００９】[0009]

【発明が解決しようとする課題】前記の加熱定着方式の
うち、熱ローラ方式、ベルト加熱方式、フィルム加熱方
式においては、連続して小さなサイズの記録材を用いて
加熱定着動作を行った場合、記録材が接触する加熱体部
分と、接触しない部分で放熱量の差が生じる。例えば熱
ローラ方式の場合、熱ローラ表面温度が記録材が通過し
ていない領域のローラ部分では、記録材が通過する領域
のローラ部分より高くなる。これは従来より「非通紙部
昇温」と呼ばれている現象である。Among the heat fixing methods described above, in the heat roller method, the belt heating method, and the film heating method, when the heat fixing operation is continuously performed using a recording material of a small size, There is a difference in the amount of heat radiation between the portion of the heating element that contacts the recording material and the portion that does not contact. For example, in the case of the heat roller method, the surface temperature of the heat roller is higher in the roller portion in the area where the recording material does not pass than in the roller portion in the area where the recording material passes. This is a phenomenon conventionally called “temperature rise in non-sheet passing portion”.

【００１０】従来、熱ローラ方式の場合、熱ローラ表面
温度を検知する手段を、使用可能なすべてのサイズの記
録材が常に通過するローラ位置の表面温度を検知するよ
うに配置している。Conventionally, in the case of the heat roller system, the means for detecting the heat roller surface temperature is arranged so as to detect the surface temperature at the roller position through which the recording materials of all sizes that can be used always pass.

【００１１】その場合、上記の非通紙部昇温が発生した
時点で、通紙する記録材のサイズをより大きいものに切
り替えた場合、それまで通紙していた小さなサイズの記
録材の対応領域よりも外側領域の熱ローラ部分の表面温
度が高くなりすぎており、いわゆる「高温オフセット」
が生ずる場合がある。In this case, when the size of the recording material to be passed is switched to a larger size at the time when the temperature rise in the non-sheet passing portion occurs, the recording material of a small size that has been passed until then can be handled. The surface temperature of the heat roller part in the outer area is too high than the area, so-called "high temperature offset"
May occur.

【００１２】ベルト加熱方式及びフィルム加熱方式で
も、小サイズの記録材を連続して加熱処理した場合、熱
ローラ方式と同様のメカニズムにより、加熱体及びベル
ト／フィルム上に非通紙部昇温を発生し、高温オフセッ
トを発生する恐れがある。さらに、ベルト加熱方式はも
ちろんのこと、フィルム加熱方式で無端のベルト状フィ
ルムを用いた場合、ベルトまたはベルト状フィルムを駆
動する駆動軸の温度も、ベルトまたはベルト状フィルム
からの熱伝導により昇温する。従って小サイズの記録材
を連続して処理すると、加熱体及びベルトの非通紙部昇
温により駆動軸の温度も軸方向に関して均一でなくな
る。すると駆動軸の径は軸方向にわたって不均一にな
る。Even in the belt heating method and the film heating method, when a small-sized recording material is continuously heated, the same mechanism as the heat roller method is used to raise the temperature of the non-sheet passing portion on the heating element and the belt / film. May occur, and high temperature offset may occur. In addition to the belt heating method, when an endless belt-shaped film is used in the film heating method, the temperature of the belt or the drive shaft that drives the belt-shaped film also rises due to heat conduction from the belt or belt-shaped film. To do. Therefore, when a small-sized recording material is continuously processed, the temperature of the drive shaft is not uniform in the axial direction due to the temperature rise in the non-sheet passing portion of the heating body and the belt. Then, the diameter of the drive shaft becomes non-uniform in the axial direction.

【００１３】従来、無端ベルトを駆動する軸がテーパー
状に径差を持った場合、大径方向にベルトが変位するこ
とが知られている。そのため前記のように小サイズの記
録材を連続して加熱処理すると、駆動軸の軸方向の外形
形状が、加熱処理前に比べて時間的に変化していき、駆
動軸の外形差によるベルトの変位方向も時間的に変化す
ることになり、ベルトの駆動が不安定になりやすい。It has been conventionally known that when the shaft for driving the endless belt has a taper difference in diameter, the belt is displaced in the direction of the large diameter. Therefore, when a small-sized recording material is continuously heat-treated as described above, the outer shape of the drive shaft in the axial direction changes with time as compared with that before the heat treatment, and the belt is affected by the difference in the outer shape of the drive shaft. The displacement direction also changes with time, and the driving of the belt tends to become unstable.

【００１４】さらに、ベルトとして１００μｍ以下、特
に４０μｍ以下程度の薄肉で、ポリイミド等の弾性率の
高い材料を使った場合、ベルトの駆動軸上の変位方向が
不均一だとシワになる恐れもある。Further, when the belt is thin and has a thickness of 100 μm or less, especially 40 μm or less, and a material having a high elastic modulus such as polyimide is used, wrinkles may occur if the displacement direction of the belt on the drive shaft is not uniform. ..

【００１５】特に、加熱体として低熱容量のヒータを用
いることのできるフィルム加熱方式の場合、加熱体の熱
容量が熱ローラ方式やベルト加熱方式に比べて小さいの
で、加熱体の非通紙部昇温も大きく、高温オフセットも
発生しやすい。また、ベルト駆動の不安定性、ベルト状
フィルムのシワ等の問題も発生しやすい。In particular, in the case of the film heating method in which a heater having a low heat capacity can be used as the heating element, the heating element has a smaller heat capacity than the heat roller method or the belt heating method, so that the temperature of the non-sheet passing portion of the heating element rises. Is also large and high temperature offset is likely to occur. Further, problems such as instability of belt drive and wrinkles of the belt-shaped film are likely to occur.

【００１６】フィルム加熱方式の場合加熱体とフィルム
が摺動するが、従来、摩擦係数は温度依存性があること
が知られている。本発明者らの実験によると、加熱体と
フィルムの間の摩擦係数が変化するとフィルムの駆動軸
軸方向の変位速度が変化することが明らかになってい
る。すると、加熱体に駆動軸軸方向の温度が不均一とな
り、ベルト状フィルムの駆動安定性がさらに損なわれフ
ィルムがシワになる危険もますます大きくなる。In the case of the film heating method, the heating body and the film slide, but it has been conventionally known that the friction coefficient has temperature dependency. Experiments by the present inventors have revealed that when the friction coefficient between the heating body and the film changes, the displacement speed of the film in the axial direction of the drive axis changes. Then, the temperature of the heating element in the direction of the drive shaft axis becomes non-uniform, and the driving stability of the belt-shaped film is further impaired, and the risk of wrinkling of the film increases.

【００１７】本発明は上記のような問題点を解消するこ
とを目的とするものである。An object of the present invention is to solve the above problems.

【００１８】[0018]

【課題を解決するための手段】本発明は、耐熱性フィル
ムの一面側に加熱体を、他面側に被加熱材を密着させ、
前記耐熱性フィルムを介して加熱体の熱エネルギーを被
加熱材に付与する加熱装置において、加熱体の長手に沿
って熱伝導率が高くかつ所定の熱容量を持つ蓄熱・熱伝
導部材を具備させたことを特徴とする加熱装置、であ
る。According to the present invention, a heating body is adhered to one surface side of a heat resistant film and a material to be heated is adhered to the other surface side thereof,
In a heating device for applying heat energy of a heating body to a material to be heated through the heat resistant film, a heat storage / heat conduction member having a high thermal conductivity and a predetermined heat capacity is provided along the length of the heating body. It is a heating device characterized by the above.

【００１９】[0019]

【作用】即ち、フィルム加熱方式の加熱装置において上
記のように加熱体の長手に沿って蓄熱・熱伝導部材を具
備させると、小サイズの被加熱材の連続通紙加熱処理を
実行した際の非通紙部領域に対応する加熱体部分の昇温
熱（高い熱エネルギー）が蓄熱・熱伝導部材を通じて、
被加熱材の加熱処理により温度の低くなっている通紙部
領域に対応する加熱体部分側へすばやく伝達されること
により、加熱体の長手全長部の温度分布が通紙部と非通
紙部間で均一化されて加熱体の非通紙部昇温現象が緩和
される。In other words, when the film heating type heating device is provided with the heat storage / heat conduction member along the length of the heating body as described above, a continuous sheet heating process for a small-sized material to be heated is performed. The temperature rise heat (high heat energy) of the heating element part corresponding to the non-sheet passing part area is accumulated through the heat storage / heat conduction member.
The temperature distribution of the length and length of the heating element is quickly transmitted to the heating element portion side corresponding to the sheet passing portion area where the temperature is low due to the heat treatment of the material to be heated. It is made uniform between the two, and the temperature rise phenomenon of the non-sheet passing portion of the heating element is alleviated.

【００２０】従って、加熱体の非通紙部昇温に起因する
フィルムの幅方向の変位及びシワを防止し、画像加熱定
着装置にあっては小サイズ記録材の連続加熱処理直後の
サイズの大きい記録材通紙時の高温オフセットを低減す
る効果がある。Therefore, the widthwise displacement and wrinkles of the film due to the temperature rise in the non-sheet passing portion of the heating element are prevented, and in the image heating and fixing device, the size of the small-sized recording material immediately after the continuous heating is large. It has the effect of reducing high temperature offset when the recording material is passed.

【００２１】蓄熱・熱伝導部材の付加により加熱体の熱
容量を増加させることにはなるが、それでも加熱体の全
体的な熱容量は熱ローラ方式等に比べて十分に小さいた
めフィルム加熱方式の大きな利点であるクイックスター
ト性はほとんど損なわないと共に、従来の加熱体では熱
容量が非常に小さかったので温調が困難で複雑な制御を
必要としたが、本発明装置における比較的熱容量がある
加熱体では簡単な制御で温調を行え、しかもスタンバイ
温調がいらないという該フィルム加熱方式の利点も損な
わない。つまり加熱体の熱容量が小さいフィルム加熱方
式では困難だとされていた加熱体の温度制御をするのに
通電するかしないかといったような簡単な通電ＯＮ／Ｏ
ＦＦ制御で温調を行うのが容易になる。Although the heat capacity of the heating element is increased by adding the heat storage / heat conduction member, the overall heat capacity of the heating element is still sufficiently smaller than that of the heat roller method and the like, which is a great advantage of the film heating method. The quick start property is almost not impaired, and the heat capacity of the conventional heating body was very small, so temperature control was difficult and complicated control was required. The temperature control can be performed by various controls, and the advantage of the film heating method that the standby temperature control is not required is not impaired. In other words, a simple energization ON / O such as whether to energize or not to control the temperature of the heating body, which was considered to be difficult with the film heating system having a small heat capacity of the heating body.
It becomes easy to control the temperature by FF control.

【００２２】[0022]

【実施例】【Example】

＜実施例１＞（図１〜図３） 本実施例は不図示の画像形成装置における画像加熱定着
装置としての加熱装置である。図１において２４はエン
ドレスベルト状の定着フィルムであり、左側の駆動ロー
ラ２５と、右側の従動ローラ２６と、該駆動ローラ２５
と従動ローラ２６の下方に配置した加熱体としての線状
加熱体２０、の互いに平行な該３部材２０・２５・２６
に懸回張設してある。<Embodiment 1> (FIGS. 1 to 3) This embodiment is a heating device as an image heating and fixing device in an image forming apparatus (not shown). In FIG. 1, reference numeral 24 denotes an endless belt-shaped fixing film, which includes a left driving roller 25, a right driven roller 26, and the driving roller 25.
And the linear heating element 20 as a heating element disposed below the driven roller 26, the three members 20, 25, 26 parallel to each other.
It is suspended around.

【００２３】従動ローラ２６はエンドレスベルト状の定
着フィルム２４のテンションローラを兼ねさせており、
該定着フィルム２４は駆動ローラ２５の時計方向回転駆
動に伴い時計方向に所定の周速度、即ち不図示の画像形
成部（Ａ）側から搬送されてくる未定着トナー画像Ｔａ
を上面に担持した転写材シート（記録材）Ｐの搬送速度
と同じ周速度を持ってシワや蛇行、速度遅れなく回転駆
動される。The driven roller 26 also functions as a tension roller for the endless belt-shaped fixing film 24.
The fixing film 24 has a predetermined peripheral speed in the clockwise direction as the driving roller 25 is driven to rotate in the clockwise direction, that is, the unfixed toner image Ta conveyed from the image forming unit (A) side (not shown).
The transfer material sheet (recording material) P having the upper surface thereof is rotatably driven at the same peripheral speed as the conveying speed of the transfer material sheet (recording material) P without wrinkling, meandering, or speed delay.

【００２４】２８は加圧部材としての、シリコンゴム等
の離型性の良いゴム弾性層を有する加圧ローラであり、
前記のエンドレスベスト状定着フィルム２４の下行側フ
ィルム部分を挟ませて前記線状加熱体２０の下面に対し
て不図示の付勢手段により例えば総圧４〜１２ｋｇの圧
接力を持って対向圧接させてあり、転写材シートＰの搬
送方向に順方向の反時計方向に回転する。Reference numeral 28 denotes a pressure roller having a rubber elastic layer such as silicon rubber having a good releasability as a pressure member,
The lower film portion of the endless vest-shaped fixing film 24 is sandwiched and is brought into opposing pressure contact with the lower surface of the linear heating element 20 by a pressing means (not shown) with a total pressure of 4 to 12 kg. The transfer material sheet P rotates in the counterclockwise direction in the forward direction.

【００２５】回動駆動されるエンドレスベルト状の定着
フィルム２４は繰り返してトナー画像の加熱定着に供さ
れるから、耐熱性・離型性・耐久性に優れたもので、一
般的には１００μｍ以下、好ましくは４０μｍ以下の薄
肉のものを使用する。例えばポリイミド・ポリエーテル
イミド・ＰＥＳ・ＰＦＡ（４フッ化エチレン−パーフル
オロアルキルビニルエーテル共重合体樹脂）などの耐熱
樹脂の単層フィルム、或いは複合層フィルム例えば２０
μｍ厚フィルムの少なくとも画像当接面側にＰＴＦＥ
（４フッ化エチレン樹脂）・ＰＡＦ等のフッ素樹脂に導
電材を添加した離型性コート層を１０μｍ厚に施したも
のなどである。Since the endless belt-shaped fixing film 24 which is rotationally driven is repeatedly used for heat fixing of the toner image, it has excellent heat resistance, releasability and durability, and is generally 100 μm or less. It is preferable to use a thin film having a thickness of 40 μm or less. For example, a single layer film of a heat-resistant resin such as polyimide, polyether imide, PES, PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin) or a composite layer film, for example, 20
At least on the image contact surface side of the μm thick film, PTFE
(Tetrafluoride ethylene resin) -A resin having a releasable coating layer of a conductive resin added to a fluororesin such as PAF and having a thickness of 10 μm.

【００２６】加熱体としての線状加熱体２０は本例のも
のは、図２に拡大横断面を示したように、定着フィルム
横断方向（定着フィルム２４の走行方向に直角方向）を
長手とする横長の剛性・高耐熱性・断熱性を有するヒー
タ支持体２７と、その下面側に下面長手に沿って一体に
取り付け支持させた、通電発熱体２２、検温素子２３、
絶縁層２９、熱伝導率が高く（例えば、０．１cal/cm・s
ec・deg以下）かつ所定の熱容量（例えば、０．５〜１５
cal/℃）を持つ蓄熱・熱伝導部材３０、表面層３１等を
具備させたヒータ基板２１を有してなる。In the linear heating element 20 as the heating element of this embodiment, as shown in the enlarged cross section of FIG. 2, the longitudinal direction is the transverse direction of the fixing film (the direction perpendicular to the running direction of the fixing film 24). A horizontally long heater support 27 having rigidity, high heat resistance and heat insulation, and an energization heating element 22 and a temperature measuring element 23 integrally attached to and supported on the lower surface side along the lower surface length,
Insulation layer 29, high thermal conductivity (eg 0.1 cal / cm · s
ec · deg or less) and a predetermined heat capacity (for example, 0.5 to 15)
It has a heater substrate 21 provided with a heat storage / heat conduction member 30 having a cal / ° C.), a surface layer 31, and the like.

【００２７】ヒータ支持体２７は線状加熱体２０を機械
全体に対し断熱するもので、例えばＰＰＳ（ポリフェニ
レンサルファイド）、ＰＡＩ（ポリアミドイミド）、Ｐ
Ｉ（ポリイミド）、ＰＥＥＫ（ポリエーテルエーテルケ
トン）、液晶ポリマー等の高耐熱性樹脂や、これらの樹
脂とセラミックス、金属、ガラス等との複合材料などで
構成できる。The heater support 27 insulates the linear heating element 20 from the entire machine, and is, for example, PPS (polyphenylene sulfide), PAI (polyamide imide), P.
It can be made of high heat resistant resin such as I (polyimide), PEEK (polyether ether ketone), liquid crystal polymer, or a composite material of these resins and ceramics, metal, glass or the like.

【００２８】ヒータ基板２１は耐熱性・絶縁性・低熱容
量・高熱伝導性の部材であり、一例として厚み１ｍｍ・
幅１６ｍｍ・長さ３４０ｍｍのアルミナ基板である。The heater substrate 21 is a member having heat resistance, insulation, low heat capacity and high heat conductivity, and as an example, the thickness is 1 mm.
It is an alumina substrate having a width of 16 mm and a length of 340 mm.

【００２９】発熱体２２は、基板２１の下面の略中央部
に沿って、例えばＡｇ／Ｐｄ（銀パラジウム）・Ｔａ₂
Ｎ等の電気抵抗材料を厚み約１０μｍ、幅１〜３ｍｍに
スクリーン印刷等により塗工したものである。The heating element 22 is, for example, Ag / Pd (silver palladium) .Ta ₂ along the substantially central portion of the lower surface of the substrate 21.
An electric resistance material such as N having a thickness of about 10 μm and a width of 1 to 3 mm is applied by screen printing or the like.

【００３０】本例の加熱体は上記の発熱体２２を形成し
たヒータ基板面に発熱体２２との間に絶縁層２９として
のガラス層を介して、本発明の特徴である、ある程度の
熱容量を持つ熱伝導率の高いＡｌ等の金属よりなる蓄熱
・熱伝導部材３０をヒータ基板長手全長にわたって０．
５〜３ｍｍの厚さで形成具備させてある。またさらにこ
の上に定着フィルム２４との摺擦摩擦を低減するために
ＰＦＡ・ＰＴＦＥ等の滑性表面層３１をコートしても良
い。The heating element of this example has a certain heat capacity, which is a feature of the present invention, through a glass layer as an insulating layer 29 between the heating element 22 and the heating element 22 on the surface of the heater substrate. The heat storage / heat conduction member 30 made of a metal such as Al having a high heat conductivity is provided over the entire longitudinal length of the heater substrate.
It is formed to have a thickness of 5 to 3 mm. Further, a smooth surface layer 31 such as PFA / PTFE may be coated on the surface of the fixing film 24 in order to reduce friction with the fixing film 24.

【００３１】検温素子２３は一例としてヒータ基板２１
の上面（発熱体２２を設けた面とは反対側の面）の略中
央部にスクリーン印刷等により塗工して具備させたＰｔ
膜等の低熱容量の測温抵抗体である。検温素子として
は、他に低熱容量のサーミスタなどをヒータ基板２１に
当接配置する構成にしてもよい。The temperature detecting element 23 is, for example, the heater substrate 21.
Pt applied by screen printing or the like to the substantially central portion of the upper surface (the surface opposite to the surface on which the heating element 22 is provided) of
It is a resistance temperature detector with a low heat capacity such as a film. Alternatively, as the temperature detecting element, a thermistor having a low heat capacity may be arranged in contact with the heater substrate 21.

【００３２】本例の加熱体は、線状又は帯状をなす発熱
体２２に対し、その長手方向両端部より通電し、発熱体
２２をほぼ略全長にわたって発熱させる。通電はＡＣ１
００Ｖであり、検温素子２３の検知温度に応じてトライ
アックを含む不図示の通電制御回路により通電する位相
角を制御することにより通電電力を制御している。In the heating element of this example, electricity is applied to the heating element 22 having a linear or strip shape from both ends in the longitudinal direction thereof to cause the heating element 22 to generate heat over substantially the entire length. Power is AC1
It is 00 V, and the energizing power is controlled by controlling the energizing phase angle by an energization control circuit (not shown) including a triac according to the temperature detected by the temperature detecting element 23.

【００３３】画像形成スタート信号により画像形成部
（Ａ）が動作して該画像形成部から定着装置へ搬送され
た、未定着のトナー画像Ｔａを上面に担持した記録材Ｐ
はガイドに案内されて加熱体２０と加圧ローラ２８との
圧接部（定着部）Ｎの定着ローラ２４と加圧ローラ２８
との間に進入して、未定着トナー画像面が記録材シート
Ｐの搬送速度と同一速度で同方向に回動状態の定着ロー
ラ２４の下面に密着して面ズレやしわ寄りを生じること
なく定着ローラ２４と一緒の重なり状態で加熱体２０と
加圧ローラ２８との相互圧接部Ｎ間を挟圧力を受けつつ
通過していく。加熱体２０は画像形成スタート信号によ
り所定のタイミングで通電加熱されるので、トナー画像
Ｔａは圧接部Ｎにおいて加熱を受けて軟化・溶融像Ｔｂ
となる。The image forming section (A) operates in response to the image forming start signal, and the recording material P having the unfixed toner image Ta carried on the upper surface, which is conveyed from the image forming section to the fixing device.
Is guided by the guide to the fixing roller 24 and the pressure roller 28 at the pressure contact portion (fixing portion) N between the heating body 20 and the pressure roller 28.
And the unfixed toner image surface comes into close contact with the lower surface of the fixing roller 24 which is rotated in the same direction as the conveyance speed of the recording material sheet P in the same direction without causing surface deviation or wrinkling. In the overlapping state with the fixing roller 24, the heating body 20 and the pressure roller 28 pass between the mutual pressure contact portions N while receiving a sandwiching pressure. Since the heating element 20 is electrically heated at a predetermined timing in response to the image formation start signal, the toner image Ta is heated at the press contact portion N and softened / melted image Tb.
Becomes

【００３４】定着ローラ２４は、ヒータ支持体２７の曲
率の大きいエッジ部Ｓ（曲率半径が約２ｍｍ）におい
て、急角度は（屈曲角度θが略４５゜）で走行方向が転
向する。従って、定着ローラ２４と重なった状態で圧接
部Ｎを通過して搬送されたシートＰは、エッジ部Ｓにお
いて定着ローラ２４から曲率分離し排紙されてゆく。排
紙される時までにはトナーは十分冷却固化しシートＰに
完全に定着した状態（トナー画像Ｔｃ）となっている。At the edge portion S (having a radius of curvature of about 2 mm) having a large curvature of the heater support 27, the fixing roller 24 turns its running direction at a steep angle (the bending angle θ is about 45 °). Therefore, the sheet P conveyed by passing through the pressure contact portion N while being overlapped with the fixing roller 24 is separated from the fixing roller 24 at the edge portion S by curvature and is discharged. By the time the paper is ejected, the toner is sufficiently cooled and solidified and is in a state of being completely fixed on the sheet P (toner image Tc).

【００３５】発熱体２２及びヒータ基板２１の熱容量が
小さく、かつ、これらが支持体２７により断熱支持され
ているので、圧接部Ｎにおける加熱体の表面温度は短時
間にトナーの融点（又はシートＰへの定着可能温度）に
対して十分な高温に昇温するので、加熱体をあらかじめ
昇温させておく（いわゆるスタンバイ温調）必要がな
く、省エネルギーが実現でき、しかも機内昇温も防止で
きる。Since the heat capacities of the heating element 22 and the heater substrate 21 are small and they are adiabatically supported by the support 27, the surface temperature of the heating element at the pressure contact portion N is the melting point of the toner (or the sheet P) in a short time. Since the temperature is raised to a temperature sufficiently higher than the (fixable temperature for fixing), it is not necessary to raise the temperature of the heating body in advance (so-called standby temperature adjustment), energy can be saved, and the temperature rise inside the machine can be prevented.

【００３６】小サイズのシートＰを連続通紙して加熱定
着処理を実行した際は加熱体の長手に関して非通紙部領
域に対応する加熱体部分の昇温熱が蓄熱・熱伝導部材３
０を通じて、シートの連続加熱定着処理により温度の低
くなっている通紙部領域に対応する加熱体部分へすばや
く伝達されることになり、加熱体の長手全長部の温度分
布が通紙部領域と非通紙部領域間で均一化されて加熱体
の非通紙部昇温現象が緩和される。図３の（ｂ）は、従
来の低熱容量線状加熱体（蓄熱・熱伝導部材３０のない
加熱体）を用い片側搬送基準で小サイズシートの連続通
紙加熱定着を行った場合の加熱体長手方向にわたる温度
分布を示したものであり、同図（ａ）は本実施例のよう
に蓄熱・熱伝導部材３０を具備させた加熱体を用い同じ
く片側搬送基準で小サイズシートの連続通紙加熱定着を
行ったときの加熱体長手方向にわたる温度分布である。
（ａ）と（ｂ）との対比で明らかなように（ａ）即ち本
実施例の場合の方が非通紙部昇温現象が大幅に低減され
る。When a small-size sheet P is continuously fed and the heat fixing process is carried out, the temperature rise heat of the heating body portion corresponding to the non-sheet passing portion area in the longitudinal direction of the heating body is the heat storage / heat conduction member 3
0, the sheet is rapidly transferred to the heating element portion corresponding to the sheet passing portion area where the temperature is low due to the continuous heating and fixing process of the sheet, and the temperature distribution of the longitudinal entire length portion of the heating element is transferred to the sheet passing portion area. The non-sheet passing portion area is made uniform and the temperature rise phenomenon of the non-sheet passing portion of the heating element is alleviated. FIG. 3B is a heating body length in the case where the conventional low heat capacity linear heating body (heating body without the heat storage / heat conduction member 30) is used to perform continuous sheet heating and fixing of small-sized sheets on the basis of single-sided conveyance. FIG. 6A shows a temperature distribution in the hand direction. FIG. 8A shows a continuous heating method for a small-sized sheet using the heating body provided with the heat storage / heat conducting member 30 as in the present embodiment, similarly to the one-sided conveyance standard. It is a temperature distribution in the longitudinal direction of the heating body when heat fixing is performed.
As is clear from the comparison between (a) and (b), the phenomenon of temperature rise in the non-sheet passing portion is significantly reduced in (a), that is, in the case of this embodiment.

【００３７】本例の場合、蓄熱・熱伝導部材３０を備え
ることによって線状加熱体の熱容量は若干大きくなる。
このことはフィルム加熱方式の大きな利点であるスタン
バイ温調が不要になるということに不利に働くが、本発
明者らの実験によると実際には実用上ほとんど問題はな
く、非通紙部昇温の解消に大きな効果がえられた。また
該蓄熱・熱伝導部材３０を備えることにより熱容量が大
きくなり通紙時における加熱体の温度低下のスピードが
にぶり温調を簡単に行えるようになる。In the case of this example, the heat storage / heat conduction member 30 is provided, so that the heat capacity of the linear heating element is slightly increased.
This is disadvantageous in that the stand-by temperature control, which is a great advantage of the film heating method, is unnecessary, but according to the experiments by the present inventors, there is practically no problem in practical use, and the temperature rise in the non-sheet-passing portion is high. It was very effective in eliminating the problem. Further, since the heat storage / heat conduction member 30 is provided, the heat capacity is increased, and the speed of the temperature decrease of the heating element during the passage of paper can be reduced and the temperature control can be easily performed.

【００３８】＜実施例２＞（図４） 本実施例は図４のように加熱体の蓄熱・熱伝導部材３０
を発熱体２２よりも通紙方向上流側の全領域に延長３ａ
させたことを特徴としている。この蓄熱・熱伝導部材３
０の延長部３０ａにより定着部Ｎに定着フィルム２４が
入る前にあらかじめある程度該定着フィルム２４の温度
を上げておくことができ、実施例１と同等の効果があ
り、その上定着性の向上や定着温度の低下がはかれる。<Embodiment 2> (FIG. 4) In this embodiment, as shown in FIG. 4, the heat storage / heat conduction member 30 of the heating element is used.
Extend to the entire area upstream of the heating element 22 in the sheet passing direction 3a
It is characterized by having done. This heat storage / heat conduction member 3
The extension portion 30a of 0 can raise the temperature of the fixing film 24 to some extent before the fixing film 24 enters the fixing portion N, which has the same effect as that of the first embodiment, and further improves the fixing property. The fixing temperature can be lowered.

【００３９】＜実施例３＞（図５） 本実施例は加熱体の蓄熱・熱伝導部材３０を発熱体２２
の通紙方向上流側においてヒータ基板の長手側部に長手
に沿って具備させ、発熱体２２は絶縁層２９を介して定
着フィルム２４に極力近い位置に具備させたものであ
る。定着装置（定着フィルム、加圧ローラ等）が完全に
冷えている状態において発熱体２２が定着フィルム２４
に近い状態にあることは、フィルム加熱方式の利点であ
るスタンバイ温調不要、いわゆるクイックスタートをほ
とんど損なうことがなく、しかも連続通紙時における非
通紙部昇温の防止効果も蓄熱・熱伝導部材３０の存在に
より前記実施例１・同２と同様に得られる。<Embodiment 3> (FIG. 5) In this embodiment, the heat storage / heat conduction member 30 of the heating element is used as the heating element 22.
The heating element 22 is provided along the longitudinal side of the heater substrate on the upstream side in the sheet passing direction, and the heating element 22 is provided at a position as close as possible to the fixing film 24 via the insulating layer 29. When the fixing device (fixing film, pressure roller, etc.) is completely cooled, the heating element 22 is fixed to the fixing film 24.
It is close to the condition that there is no need for standby temperature control, which is an advantage of the film heating method, so-called quick start is hardly impaired, and the effect of preventing temperature rise in the non-sheet passing area during continuous sheet feeding is heat storage and heat conduction. Due to the presence of the member 30, it can be obtained in the same manner as in the first and second embodiments.

【００４０】[0040]

【発明の効果】以上のように本発明は、フィルム加熱方
式の加熱装置について、加熱体の非通紙部昇温に起因す
るフィルムの幅方向の変位及びシワを防止し、画像加熱
定着装置にあっては小サイズ記録材の連続加熱処理直後
のサイズの大きい記録材通紙時の高温オフセットを低減
する効果がある。INDUSTRIAL APPLICABILITY As described above, according to the present invention, in the film heating type heating device, the widthwise displacement and wrinkles of the film due to the temperature rise of the non-sheet passing portion of the heating body are prevented, and the image heating and fixing device is provided. This is effective in reducing high-temperature offset when a large-sized recording material is passed immediately after continuous heating of a small-sized recording material.

【００４１】蓄熱・熱伝導部材の付加により加熱体の熱
容量を増加させることにはなるが、それでも加熱体の全
体的な熱容量は熱ローラ方式等に比べて十分に小さいた
めフィルム加熱方式の大きな利点であるクイックスター
ト性はほとんど損なわないと共に、従来の加熱体では熱
容量が非常に小さかったので温調が困難で複雑な制御を
必要としたが、本発明装置における比較的熱容量がある
加熱体では簡単な制御で温調を行え、しかもスタンバイ
温調がいらないという該フィルム加熱方式の利点も損な
わない。つまり加熱体の熱容量が小さいフィルム加熱方
式では困難だとされていた加熱体の温度制御をするのに
通電するかしないかといったような簡単な通電ＯＮ／Ｏ
ＦＦ制御で温調を行うのが容易になる。Although the heat capacity of the heating element is increased by adding the heat storage / heat conduction member, the overall heat capacity of the heating element is still sufficiently smaller than that of the heat roller method and the like, which is a great advantage of the film heating method. The quick start property is almost not impaired, and the heat capacity of the conventional heating body was very small, so temperature control was difficult and complicated control was required. The temperature control can be performed by various controls, and the advantage of the film heating method that the standby temperature control is not required is not impaired. In other words, a simple energization ON / O such as whether to energize or not to control the temperature of the heating body, which was considered to be difficult with the film heating system having a small heat capacity of the heating body.
It becomes easy to control the temperature by FF control.

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

【図１】 本発明の加熱装置の一実施例としての、画像
形成装置における画像加熱定着装置の概略構成図FIG. 1 is a schematic configuration diagram of an image heating and fixing device in an image forming apparatus as an embodiment of a heating device of the present invention.

【図２】 加熱体の拡大横断面図FIG. 2 is an enlarged cross-sectional view of a heating element.

【図３】 （ａ）は蓄熱・熱伝導部材を具備させた加熱
体を用い片側搬送基準で小サイズシートの連続通紙加熱
定着を行ったときの加熱体長手方向にわたる温度分布
図、（ｂ）は蓄熱・熱伝導部材のない加熱体を用いた場
合の同温度分布図FIG. 3A is a temperature distribution diagram in the longitudinal direction of the heating body when a heating body equipped with a heat storage / heat conducting member is used to perform continuous sheet heating and fixing of a small-sized sheet on the basis of one-sided conveyance; ) Is the same temperature distribution diagram when a heating body without heat storage / heat conduction member is used

【図４】 他の実施例の加熱体の拡大横断面図FIG. 4 is an enlarged cross-sectional view of a heating body according to another embodiment.

【図５】 更に他の実施例の加熱体の拡大横断面図FIG. 5 is an enlarged transverse sectional view of a heating body according to still another embodiment.

【符号の説明図】[Explanation of symbols]

２４ 耐熱性フィルム（定着フィルム） ２０ 加熱体 ３０ 蓄熱・熱伝導部材 Ｐ 被加熱材（記録材シート） 24 Heat Resistant Film (Fixing Film) 20 Heater 30 Heat Storage / Heat Conduction Member P Heated Material (Recording Material Sheet)

───────────────────────────────────────────────────── フロントページの続き (72)発明者 荒矢 順治 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 (72)発明者 中村 俊治 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junji Araya 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Toshiharu Nakamura 3-30-2 Shimomaruko, Ota-ku, Tokyo Kya Non-corporation

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 耐熱性フィルムの一面側に加熱体を、他
面側に被加熱材を密着させ、前記耐熱性フィルムを介し
て加熱体の熱エネルギーを被加熱材に付与する加熱装置
において、加熱体の長手に沿って熱伝導率が高くかつ所
定の熱容量を持つ蓄熱・熱伝導部材を具備させたことを
特徴とする加熱装置。1. A heating device in which a heating element is adhered to one surface side of a heat resistant film and a material to be heated is adhered to the other surface side, and heat energy of the heating element is applied to the material to be heated through the heat resistant film, A heating device comprising a heat storage / heat conduction member having a high heat conductivity and a predetermined heat capacity along the length of a heating body.