JP7187766B2 - Fixing device and image forming device - Google Patents

Fixing device and image forming device Download PDF

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JP7187766B2
JP7187766B2 JP2017145005A JP2017145005A JP7187766B2 JP 7187766 B2 JP7187766 B2 JP 7187766B2 JP 2017145005 A JP2017145005 A JP 2017145005A JP 2017145005 A JP2017145005 A JP 2017145005A JP 7187766 B2 JP7187766 B2 JP 7187766B2
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resistance heating
heating elements
fixing device
gap
belt member
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JP2019028151A (en
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正和 高橋
丈太 小林
元春 中尾
靖 永田
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Fujifilm Business Innovation Corp
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Fuji Xerox Co Ltd
Fujifilm Business Innovation Corp
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Description

本発明は、定着装置及び画像形成装置に関する。 The present invention relates to fixing devices and image forming apparatuses.

耐熱・絶縁性材料で形成される長尺平板状の基板の長手方向に発熱抵抗体と該発熱抵抗体に電力を供給するための電極を形成し、基板および発熱抵抗体上にガラスペーストを印刷・焼成して形成したオーバーコート層を施したセラミックヒータにおいて、オーバーコート層に発生する気泡の大きさを、基板上を発熱抵抗体上よりも大きくすることで、オーバーコート層の表面の凹凸を小さくしたセラミックヒータが知られている（特許文献１）。 A heating resistor and an electrode for supplying power to the heating resistor are formed in the longitudinal direction of a long flat plate-shaped substrate made of a heat-resistant and insulating material, and glass paste is printed on the substrate and the heating resistor.・In a ceramic heater with an overcoat layer formed by firing, by making the size of air bubbles generated in the overcoat layer larger on the substrate than on the heating resistor, the unevenness of the surface of the overcoat layer is smoothed out. A smaller ceramic heater is known (Patent Document 1).

基板上に、対の電極を一定間隔を置いて並設し、各対の電極を接続する抵抗体を設け、抵抗体と電極の一部を被覆する保護外装を施した多連抵抗素子構造において、各対の電極と抵抗体とで構成される抵抗素子と抵抗素子との間に、抵抗体と基板表面との段差を埋めるための補填層を設けた多連抵抗素子構造も知られている（特許文献２）。 In a multiple resistance element structure in which a pair of electrodes are arranged side by side at regular intervals on a substrate, a resistor connecting each pair of electrodes is provided, and a protective sheath covering a part of the resistor and the electrode is applied There is also known a multiple resistance element structure in which a filling layer is provided between each resistance element composed of each pair of electrodes and a resistance element to fill the step between the resistance element and the substrate surface. (Patent document 2).

特開２００６－９２８３１号公報JP-A-2006-92831 特開平５－２５１２２０号公報JP-A-5-251220

本発明は、潤滑剤の濡れ性を担保してベルト部材の摺動特性を向上させることができる定着装置を提供する。 SUMMARY OF THE INVENTION The present invention provides a fixing device capable of ensuring wettability of a lubricant and improving sliding characteristics of a belt member.

前記課題を解決するために、請求項１に記載の定着装置は、
循環するベルト部材と、
前記ベルト部材に接触し、前記ベルト部材との間を移動する記録媒体を加圧する加圧部材と、
前記ベルト部材の内面に介在する潤滑剤と、
基材上に複数の抵抗発熱体と前記複数の抵抗発熱体及び前記複数の抵抗発熱体の間隙を覆う絶縁体を有し、前記ベルト部材の内面を加熱する加熱源と、を備え、
前記加熱源は、前記複数の抵抗発熱体の位置で前記加圧部材に向けて凸状となり、前記複数の抵抗発熱体の間隙においては前記凸状よりも幅広で前記抵抗発熱体の延びる方向に沿って連続した凹状で、前記間隙の中央部において凸状となるように形成されている、
ことを特徴とする。 In order to solve the above problems, the fixing device according to claim 1 comprises:
a circulating belt member;
a pressing member that contacts the belt member and presses the recording medium moving between the belt member;
a lubricant interposed on the inner surface of the belt member;
a heating source that has a plurality of resistance heating elements on a base material, and an insulator that covers the plurality of resistance heating elements and gaps between the plurality of resistance heating elements, and heats the inner surface of the belt member;
The heat source forms a convex shape toward the pressure member at the positions of the plurality of resistance heating elements, and is wider than the convex shape in the gap between the plurality of resistance heating elements and extends in the direction in which the resistance heating elements extend. a continuous concave shape along the gap and a convex shape at the center of the gap ,
It is characterized by

請求項２記載の発明は、請求項１に記載の定着装置において、
前記加熱源は、前記ベルト部材と前記加圧部材とが接触する接触部のうち、前記複数の抵抗発熱体の前記間隙において、圧力が前記記録媒体の移動方向の下流側と上流側よりも相対的に高くなるように前記ベルト部材を内側から支持する、
ことを特徴とする。 The invention according to claim 2 is the fixing device according to claim 1, wherein:
The heating source is configured such that, in the contact portion where the belt member and the pressure member are in contact, the pressure in the gap between the plurality of resistance heating elements is higher than that on the downstream side and the upstream side in the moving direction of the recording medium. supporting the belt member from the inside so as to be relatively high;
It is characterized by

請求項３記載の発明は、請求項２に記載の定着装置において、
前記複数の抵抗発熱体の前記間隙の幅は、前記抵抗発熱体の幅よりも長い、
ことを特徴とする。 The invention according to claim 3 is the fixing device according to claim 2,
the width of the gap of the plurality of resistance heating elements is longer than the width of the resistance heating elements;
It is characterized by

請求項４記載の発明は、請求項１に記載の定着装置において、
前記絶縁体の厚みは、前記抵抗発熱体を覆う部分が前記基材を覆う部分よりも薄い、
ことを特徴とする。 The invention according to claim 4 is the fixing device according to claim 1, wherein:
The thickness of the insulator is such that a portion covering the resistance heating element is thinner than a portion covering the base material.
It is characterized by

請求項５記載の発明は、請求項１に記載の定着装置において、
前記絶縁体の厚みは、前記抵抗発熱体を覆う部分が前記基材を覆う部分よりも厚い、
ことを特徴とする。 The invention according to claim 5 is the fixing device according to claim 1,
The thickness of the insulator is such that a portion covering the resistance heating element is thicker than a portion covering the base material.
It is characterized by

請求項６記載の発明は、請求項４又は５に記載の定着装置において、
前記絶縁体の厚みは、前記複数の抵抗発熱体の間にある基材を覆う部分が前記抵抗発熱体よりも外側にある前記基材を覆う部分よりも薄い、
ことを特徴とする。 The invention according to claim 6 is the fixing device according to claim 4 or 5, wherein
The thickness of the insulator is such that a portion covering the base between the plurality of resistance heating elements is thinner than a portion covering the base outside the resistance heating elements.
It is characterized by

請求項７記載の発明は、請求項１ないし６のいずれか１項に記載の定着装置において、
前記潤滑剤は、少なくとも前記ベルト部材と前記間隙との間に介在する、
ことを特徴とする。 The invention according to claim 7 is the fixing device according to any one of claims 1 to 6,
the lubricant intervenes at least between the belt member and the gap ;
It is characterized by

前記課題を解決するために、請求項８に記載の画像形成装置は、
記録媒体への画像形成を行う画像形成手段と、
前記画像形成手段により画像が形成された前記記録媒体への前記画像を定着する請求項１ないし７のいずれか１項に記載の定着装置と、を備えた、
ことを特徴とする。 In order to solve the above problems, the image forming apparatus according to claim 8 includes:
an image forming means for forming an image on a recording medium;
and a fixing device according to any one of claims 1 to 7 for fixing the image on the recording medium on which the image is formed by the image forming means,
It is characterized by

請求項１に記載の発明によれば、加熱源が複数の抵抗発熱体の位置で加圧部材に向けて凸状となるように形成されていない構成に比べて、潤滑剤の濡れ性を担保してベルト部材の摺動特性を向上させることができる。 According to the first aspect of the invention, the wettability of the lubricant is ensured compared to the configuration in which the heating source is not formed in a convex shape toward the pressure member at the positions of the plurality of resistance heating elements. As a result, the sliding characteristics of the belt member can be improved.

請求項２に記載の発明によれば、ベルト部材の内面との間に潤滑剤が介在する領域を複数形成することができる。 According to the second aspect of the invention, it is possible to form a plurality of regions in which the lubricant intervenes between the inner surface of the belt member.

請求項２に記載の発明によれば、ベルト部材の内面との間に潤滑剤が介在する領域を複数形成することができる。 According to the second aspect of the invention, it is possible to form a plurality of regions in which the lubricant intervenes between the inner surface of the belt member.

請求項３に記載の発明によれば、絶縁体の抵抗発熱体を覆う部分が基材を覆う部分よりも厚い構成に比べて、ベルト部材への伝熱効率の低下を抑制することができる。 According to the third aspect of the invention, it is possible to suppress a decrease in the efficiency of heat transfer to the belt member compared to a configuration in which the portion of the insulator covering the resistance heating element is thicker than the portion covering the base material.

請求項４に記載の発明によれば、絶縁体の抵抗発熱体を覆う部分が基材を覆う部分よりも薄い構成に比べて、ベルト部材の摺動性の低下を抑制することができる。 According to the fourth aspect of the present invention, it is possible to suppress deterioration of the slidability of the belt member compared to a configuration in which the portion of the insulator covering the resistance heating element is thinner than the portion covering the base material.

請求項５に記載の発明によれば、絶縁体の複数の抵抗発熱体の間にある基材を覆う部分が抵抗発熱体よりも外側にある基材を覆う部分よりも厚い構成に比べて、ベルト部材の内面との間に潤滑剤が介在する領域を増大することができる。 According to the fifth aspect of the invention, compared to the configuration in which the portion of the insulator covering the substrate between the plurality of resistance heating elements is thicker than the portion covering the substrate outside the resistance heating elements, It is possible to increase the area where the lubricant intervenes between the inner surface of the belt member.

請求項６に記載の発明によれば、ベルト部材の内面に対する潤滑剤の濡れ性を担保することができる。 According to the sixth aspect of the invention, wettability of the lubricant to the inner surface of the belt member can be ensured.

請求項７に記載の発明によれば、抵抗発熱体の間に潤滑剤を保持する隙間を形成することができる。 According to the seventh aspect of the invention, a gap for retaining lubricant can be formed between the resistance heating elements.

請求項８に記載の発明によれば、加熱源が複数の抵抗発熱体の位置で加圧部材に向けて凸状となるように形成されていない構成に比べて、潤滑剤の濡れ性を担保してベルト部材の摺動特性を向上させることができる。 According to the eighth aspect of the invention, the wettability of the lubricant is ensured compared to the configuration in which the heating source is not formed in a convex shape toward the pressure member at the positions of the plurality of resistance heating elements. As a result, the sliding characteristics of the belt member can be improved.

画像形成装置の内部構成を示す断面模式図である。2 is a schematic cross-sectional view showing the internal configuration of the image forming apparatus; FIG. 定着装置の構成を示す断面模式図ある。1 is a schematic cross-sectional view showing the configuration of a fixing device; FIG. 加熱源の構成を示す平面模式図である。It is a plane schematic diagram which shows the structure of a heat source. 加熱源の構成を説明する図３におけるＡ－Ａ拡大断面模式図である。4 is an enlarged schematic cross-sectional view taken along line AA in FIG. 3 for explaining the configuration of a heat source; FIG. （ａ）は定着装置における加熱源の構成を示す断面模式図、（ｂ）は定着ニップ内での圧力分布の一例を示す図である。3A is a schematic cross-sectional view showing the configuration of a heat source in the fixing device, and FIG. 3B is a view showing an example of pressure distribution in the fixing nip; FIG. （ａ）は抵抗発熱の間隙の距離が広い場合の定着ニップを示す断面模式図、（ｂ）は定着ニップ内での圧力分布の一例を示す図である。FIG. 8A is a schematic cross-sectional view showing a fixing nip when the distance between resistive heat generation gaps is wide, and FIG. 8B is a view showing an example of pressure distribution in the fixing nip; 絶縁体の厚さを説明する加熱源の拡大断面模式図である。It is an enlarged cross-sectional schematic diagram of a heat source explaining the thickness of an insulator. （ａ）は変形例２に係る加熱源の絶縁体の厚さを説明する断面模式図、（ｂ）は定着ニップ内での圧力分布の一例を示す図である。9A is a schematic cross-sectional view for explaining the thickness of an insulator of a heat source according to Modification 2, and FIG. 9B is a view showing an example of pressure distribution within a fixing nip; FIG. 変形例２に係る加熱源の絶縁体の厚さを説明する断面模式図である。FIG. 10 is a schematic cross-sectional view for explaining the thickness of the insulator of the heat source according to Modification 2; 変形例３に係る加熱源の絶縁体の厚さを説明する断面模式図である。FIG. 11 is a schematic cross-sectional view illustrating the thickness of the insulator of the heat source according to Modification 3;

次に図面を参照しながら、以下に実施形態及び具体例を挙げ、本発明を更に詳細に説明するが、本発明はこれらの実施形態及び具体例に限定されるものではない。
また、以下の図面を使用した説明において、図面は模式的なものであり、各寸法の比率等は現実のものとは異なることに留意すべきであり、理解の容易のために説明に必要な部材以外の図示は適宜省略されている。
尚、以後の説明の理解を容易にするために、図面において、左右方向をＸ軸方向、前後方向をＹ軸方向、上下方向をＺ軸方向とする。 Next, with reference to the drawings, the present invention will be described in more detail with reference to embodiments and specific examples, but the present invention is not limited to these embodiments and specific examples.
In addition, in the explanation using the drawings below, it should be noted that the drawings are schematic, and the ratio of each dimension is different from the actual one. Illustrations other than members are omitted as appropriate.
To facilitate understanding of the following description, in the drawings, the horizontal direction is defined as the X-axis direction, the front-rear direction as the Y-axis direction, and the vertical direction as the Z-axis direction.

「第１実施形態」
（１）画像形成装置の全体構成及び動作
図１は本実施形態に係る画像形成装置１の内部構成を示す断面模式図である。
以下、図面を参照しながら、画像形成装置１の全体構成及び動作を説明する。 "First Embodiment"
(1) Overall Configuration and Operation of Image Forming Apparatus FIG. 1 is a schematic cross-sectional view showing the internal configuration of an image forming apparatus 1 according to this embodiment.
Hereinafter, the overall configuration and operation of the image forming apparatus 1 will be described with reference to the drawings.

画像形成装置１は、制御装置１０、給紙装置２０、感光体ユニット３０、現像装置４０、転写装置５０、定着装置６０、電源装置７０を備えて構成されている。画像形成装置１の上面（Ｚ方向）には、画像が記録された用紙が排出・収容される排出トレイ１ａが形成されている。 The image forming apparatus 1 includes a control device 10 , a paper feeding device 20 , a photosensitive unit 30 , a developing device 40 , a transfer device 50 , a fixing device 60 and a power supply device 70 . On the upper surface (Z direction) of the image forming apparatus 1, there is formed a discharge tray 1a for discharging and containing sheets of paper on which images are recorded.

制御装置１０は、画像形成装置１の動作を制御する画像形成装置制御部１１と、印刷処理要求に応じた画像データを準備するコントローラ部１２、露光装置ＬＨの点灯を制御する露光制御部１３等を有する。 The control device 10 includes an image forming device control section 11 that controls the operation of the image forming device 1, a controller section 12 that prepares image data according to a print processing request, an exposure control section 13 that controls lighting of the exposure device LH, and the like. have

コントローラ部１２は、外部の情報送信装置（例えばパーソナルコンピュータ等）から入力された印刷情報を潜像形成用の画像情報に変換して予め設定されたタイミングで、駆動信号を露光装置ＬＨに出力する。本実施形態の露光装置ＬＨは、複数の発光素子（ＬＥＤ：Light Emitting Diode）が主走査方向に沿って線状に配列されたＬＥＤヘッドにより構成されている。 The controller unit 12 converts print information input from an external information transmission device (for example, a personal computer, etc.) into image information for forming a latent image, and outputs a drive signal to the exposure device LH at preset timing. . The exposure apparatus LH of this embodiment is configured by an LED head in which a plurality of light emitting elements (LEDs: Light Emitting Diodes) are linearly arranged along the main scanning direction.

画像形成装置１の底部には、給紙装置２０が設けられている。給紙装置２０は、用紙積載板２１を備え、用紙積載板２１の上面には多数の記録媒体としての用紙Ｐが積載される。用紙積載板２１に積載され、規制板（不図示）で幅方向位置が決められた用紙Ｐは、上側から１枚ずつ用紙引き出し部２２により前方（Ｘ方向）に引き出された後、レジストローラ対２３のニップ部まで搬送される。 A paper feeding device 20 is provided at the bottom of the image forming apparatus 1 . The paper feeding device 20 has a paper stacking plate 21 on which a large number of papers P as recording media are stacked. Sheets P stacked on the sheet stacking plate 21 and positioned in the width direction by a regulating plate (not shown) are pulled out forward (in the X direction) one by one from the upper side by the sheet drawer 22, and then passed through a pair of registration rollers. 23 nip portion.

感光体ユニット３０は、給紙装置２０の上方（Ｚ方向）に、それぞれが並列して設けられ、回転駆動する像保持体としての感光体ドラム３１を備えている。感光体ドラム３１の回転方向にそって、帯電ローラ３２、露光装置ＬＨ、現像装置４０、一次転写ローラ５２、クリーニングブレード３４が配置されている。帯電ローラ３２には、帯電ローラ３２の表面をクリーニングするクリーニングローラ３３が対向、接触して配置されている。 The photoreceptor units 30 are arranged in parallel above the paper feeding device 20 (in the Z direction), and include photoreceptor drums 31 as rotationally driven image carriers. A charging roller 32 , an exposure device LH, a developing device 40 , a primary transfer roller 52 and a cleaning blade 34 are arranged along the rotation direction of the photosensitive drum 31 . A cleaning roller 33 that cleans the surface of the charging roller 32 is arranged to face and contact the charging roller 32 .

現像装置４０は、内部にトナーとキャリアからなる現像剤が収容される現像ハウジング４１を有する。現像ハウジング４１内には、感光体ドラム３１に対向して配置された現像剤保持体としての現像ローラ４２と、この現像ローラ４２の背面側斜め下方には現像剤を現像ローラ４２側へ撹拌搬送する一対のオーガ４４、４５が配設されている。現像ローラ４２には、現像剤の層厚を規制する層規制部材４６が近接配置されている。
現像装置４０各々は、現像ハウジング４１に収容される現像剤を除いて同様に構成され、それぞれがイエロー（Ｙ）、マゼンタ（Ｍ）、シアン（Ｃ）、黒（Ｋ）のトナー像を形成する。 The developing device 40 has a developing housing 41 in which a developing agent made up of toner and carrier is accommodated. In the developing housing 41, there are provided a developing roller 42 as a developer holding member disposed facing the photosensitive drum 31, and a developing roller 42 disposed obliquely below the back side of the developing roller 42 for agitating and conveying the developer toward the developing roller 42 side. A pair of augers 44, 45 are provided. A layer regulating member 46 that regulates the layer thickness of the developer is arranged close to the developing roller 42 .
Each developing device 40 has the same configuration except for the developer accommodated in the developing housing 41, and forms yellow (Y), magenta (M), cyan (C), and black (K) toner images, respectively. .

回転する感光体ドラム３１の表面は、帯電ローラ３２により帯電され、露光装置ＬＨから出射する潜像形成光により静電潜像が形成される。感光体ドラム３１上に形成された静電潜像は現像ローラ４２によりトナー像として現像される。 The surface of the rotating photosensitive drum 31 is charged by the charging roller 32, and an electrostatic latent image is formed by latent image forming light emitted from the exposure device LH. The electrostatic latent image formed on the photosensitive drum 31 is developed as a toner image by the developing roller 42 .

転写装置５０は、各感光体ユニット３０の感光体ドラム３１にて形成された各色トナー像が多重転写される中間転写ベルト５１、各感光体ユニット３０にて形成された各色トナー像を中間転写ベルト５１に順次転写（一次転写）する一次転写ローラ５２、中間転写ベルト５１上に重畳して転写された各色トナー像を用紙Ｐに一括転写（二次転写）する二次転写ローラ５３から構成されている。 The transfer device 50 has an intermediate transfer belt 51 onto which the toner images of each color formed by the photoreceptor drums 31 of the photoreceptor units 30 are multiple-transferred, and the toner images of each color formed by each photoreceptor unit 30 are transferred onto the intermediate transfer belt 51 . 51, and a secondary transfer roller 53 for collectively transferring (secondary transfer) the toner images of each color superimposed and transferred onto the intermediate transfer belt 51 onto the paper P. there is

各感光体ユニット３０の感光体ドラム３１に形成された各色トナー像は、画像形成装置制御部１１により制御される電源装置７０から所定の転写電圧が印加された一次転写ローラ５２により中間転写ベルト５１上に順次静電転写（一次転写）され、各色トナーが重畳された重畳トナー像が形成される。 Each color toner image formed on the photosensitive drum 31 of each photosensitive unit 30 is transferred to the intermediate transfer belt 51 by the primary transfer roller 52 to which a predetermined transfer voltage is applied from the power supply device 70 controlled by the image forming apparatus control section 11 . A superimposed toner image is formed by sequentially electrostatically transferring (primary transfer) onto the toner image, and the toners of the respective colors are superimposed.

中間転写ベルト５１上の重畳トナー像は、中間転写ベルト５１の移動に伴って二次転写ローラ５３が配置された領域（二次転写部Ｔ）に搬送される。重畳トナー像が二次転写部Ｔに搬送されると、そのタイミングに合わせて給紙装置２０から用紙Ｐが二次転写部Ｔに供給される。そして、二次転写ローラ５３には、画像形成装置制御部１１により制御される電源装置７０から所定の転写電圧が印加され、レジストローラ対２３から送り出され、搬送ガイドにより案内された用紙Ｐに中間転写ベルト５１上の多重トナー像が一括転写される。 As the intermediate transfer belt 51 moves, the superimposed toner image on the intermediate transfer belt 51 is conveyed to an area (secondary transfer portion T) where the secondary transfer roller 53 is arranged. When the superimposed toner image is conveyed to the secondary transfer portion T, the paper P is supplied to the secondary transfer portion T from the paper feeding device 20 in accordance with the timing. A predetermined transfer voltage is applied to the secondary transfer roller 53 from the power supply 70 controlled by the image forming apparatus control section 11, and the intermediate transfer roller 53 is sent out from the registration roller pair 23 and transferred to the paper P guided by the conveyance guide. The multiple toner images on the transfer belt 51 are collectively transferred.

感光体ドラム３１表面の残留トナーは、クリーニングブレード３４により除去され、廃現像剤収容部に回収される。感光体ドラム３１の表面は、帯電ローラ３２により再帯電される。尚、クリーニングブレード３４で除去しきれず帯電ローラ３２に付着した残留物は、帯電ローラ３２に接触して回転するクリーニングローラ３３表面に捕捉され、蓄積される。 Residual toner on the surface of the photoreceptor drum 31 is removed by the cleaning blade 34 and collected in the waste developer container. The surface of the photosensitive drum 31 is recharged by the charging roller 32 . Residues that cannot be completely removed by the cleaning blade 34 and adhere to the charging roller 32 are captured and accumulated on the surface of the cleaning roller 33 rotating in contact with the charging roller 32 .

定着装置６０は、加熱源を備えた加熱モジュール６１と加圧モジュール６２を有し、加熱モジュール６１と加圧モジュール６２の圧接領域によって定着ニップＮ（定着領域）が形成される。 The fixing device 60 has a heating module 61 provided with a heat source and a pressure module 62 , and a pressure contact area between the heating module 61 and the pressure module 62 forms a fixing nip N (fixing area).

転写装置５０においてトナー像が転写された用紙Ｐは、トナー像が未定着の状態で搬送ガイドを経由して定着装置６０に搬送される。定着装置６０に搬送された用紙Ｐは、一対の加熱モジュール６１と加圧モジュール６２により、圧着と加熱の作用でトナー像が定着される。
定着トナー像が形成された用紙Ｐは、搬送ローラ対６８を介して排出ローラ対６９から画像形成装置１上面の排出トレイ１ａに排出される。 The paper P onto which the toner image has been transferred by the transfer device 50 is transported to the fixing device 60 via a transport guide while the toner image is not yet fixed. A pair of heating module 61 and pressure module 62 presses and heats the sheet P conveyed to the fixing device 60 to fix the toner image thereon.
The paper P on which the fixed toner image is formed is discharged from the discharge roller pair 69 via the transport roller pair 68 to the discharge tray 1 a on the upper surface of the image forming apparatus 1 .

（２）定着装置６０の構成
図２は定着装置６０の構成を示す断面模式図、図３は加熱源６１２の構成を示す平面模式図、図４は加熱源６１２の構成を説明する図３におけるＡ－Ａ拡大断面模式図、図５（ａ）は定着装置６０における加熱源６１２の構成を示す断面模式図、（ｂ）は定着ニップＮ内での圧力分布の一例を示す図である。 (2) Configuration of Fixing Device 60 FIG. 2 is a schematic cross-sectional view showing the configuration of the fixing device 60, FIG. 3 is a schematic plan view showing the configuration of the heat source 612, and FIG. 5A is an enlarged schematic cross-sectional view taken along line AA, FIG. 5A is a schematic cross-sectional view showing the configuration of a heat source 612 in the fixing device 60, and FIG.

（２．１）定着装置の全体構成
定着装置６０には、加熱モジュール６１と加圧モジュール６２から構成されている。
加熱モジュール６１には、用紙Ｐへのトナー像の定着に用いられるベルト部材の一例としての定着ベルト６１１が設けられている。定着ベルト６１１は、図中反時計回り方向（図２中 矢印Ｒ参照）に回転する。 (2.1) Overall Configuration of Fixing Device The fixing device 60 includes a heating module 61 and a pressure module 62 .
The heating module 61 is provided with a fixing belt 611 as an example of a belt member used for fixing the toner image on the paper P. As shown in FIG. The fixing belt 611 rotates counterclockwise in the figure (see arrow R in FIG. 2).

定着ベルト６１１は、両端部が開放された無端状のベルト部材であり、ポリイミド（ＰＩ）等の耐熱樹脂で薄肉円筒状に形成されたベルト基材の表面に、ポリテトラフルオロエチレン（ＰＴＦＥ）などのフッ素樹脂を含む離形層が形成された多層構造となっている。 The fixing belt 611 is an endless belt member whose both ends are open. The surface of a thin cylindrical belt base material made of a heat-resistant resin such as polyimide (PI) is coated with polytetrafluoroethylene (PTFE) or the like. It has a multi-layer structure in which a release layer containing fluororesin is formed.

定着ベルト６１１の内側には、図３に示すように、定着ベルト６１１の移動方向（Ｘ方向）、および、定着ベルト６１１の幅方向（Ｙ方向）に沿って延びる板状の加熱源６１２が設けられている。加熱源６１２は面状発熱体であり、この加熱源６１２により定着ベルト６１１が所定の温度になるように加熱される。 Inside the fixing belt 611, as shown in FIG. 3, a plate-like heat source 612 extending along the moving direction (X direction) of the fixing belt 611 and the width direction (Y direction) of the fixing belt 611 is provided. It is The heating source 612 is a planar heating element, and the heating source 612 heats the fixing belt 611 to a predetermined temperature.

加熱源６１２は、耐熱・電気絶縁性材料である酸化アルミニウムからなり加熱源６１２からの熱を受ける熱受け板６１３を介して、ポリエチレンテレフタレート（ＰＥＴ）などの耐熱性を有する合成樹脂により構成された保持部材６１４で保持されている。そして、保持部材６１４が、合成樹脂で構成され大きな曲げ強度を有する支持部材６１５で支持されている。 The heat source 612 is composed of a heat-resistant synthetic resin such as polyethylene terephthalate (PET) via a heat-receiving plate 613 which is made of aluminum oxide, which is a heat-resistant and electrically insulating material, and receives heat from the heat source 612 . It is held by a holding member 614 . The holding member 614 is supported by a support member 615 made of synthetic resin and having high bending strength.

さらに、加熱モジュール６１には、温度センサＳＮＲが設けられている。温度センサＳＮＲは、保持部材６１４及び熱受け板６１３を貫通して加熱源６１２に接触配置され、加熱源６１２の温度を検出する。
また、保持部材６１４と支持部材６１５の両端部には、定着ベルト６１１の開放された両端部の内周面を回転可能に支持する一対のベルトガイド部材６１６（不図示）が設けられている。 Furthermore, the heating module 61 is provided with a temperature sensor SNR. The temperature sensor SNR penetrates the holding member 614 and the heat receiving plate 613 and is arranged in contact with the heat source 612 to detect the temperature of the heat source 612 .
A pair of belt guide members 616 (not shown) are provided at both ends of the holding member 614 and the support member 615 to rotatably support the inner circumferential surfaces of the open ends of the fixing belt 611 .

このように構成される加熱モジュール６１は、加熱源６１２と定着ベルト６１１に内面との間に潤滑剤Ｓを介在させる（図５（ａ）参照）ことで定着ベルト６１１と加熱源６１２との摺動性を確保している。潤滑剤Ｓは、その主成分（５０質量％以上）として、アミン当量５０，０００ｇ／ｍｏｌ以下の潤滑性オイル（アミン潤滑性オイル）を含むことが定着ベルト６１１の内周面からの潤滑剤の離脱を抑制して、定着ベルト６１１の摩耗を抑制できる点で好ましい。 In the heating module 61 configured in this manner, a lubricant S is interposed between the heat source 612 and the inner surface of the fixing belt 611 (see FIG. 5A), thereby preventing friction between the fixing belt 611 and the heat source 612 . Ensures mobility. Lubricant S contains lubricating oil (amine lubricating oil) having an amine equivalent of 50,000 g/mol or less as its main component (50% by mass or more). This is preferable in that it is possible to suppress detachment and wear of the fixing belt 611 .

加圧モジュール６２は、加圧ローラ６２１と、加圧ローラ６２１を加熱モジュール６１に押圧する押圧ばね（不図示）を含む押圧機構（不図示）から構成されている。
加圧ローラ６２１は、例えば、金属製の円筒状の芯材６２２と、芯材６２２の外周面に被覆された耐熱性弾性体層６２３（例えばシリコーンゴム層や、フッ素ゴム層等）と、さらに、必要に応じて、例えばＰＦＡ等の耐熱性樹脂被覆または耐熱性ゴム被覆による表面離型層６２４とが積層されて構成される。 The pressure module 62 is composed of a pressure roller 621 and a pressure mechanism (not shown) including a pressure spring (not shown) that presses the pressure roller 621 against the heating module 61 .
The pressure roller 621 includes, for example, a cylindrical core member 622 made of metal, a heat-resistant elastic layer 623 (for example, a silicone rubber layer, a fluororubber layer, etc.) covering the outer peripheral surface of the core member 622, and further , and if necessary, a surface release layer 624 coated with a heat-resistant resin such as PFA or a heat-resistant rubber is laminated.

加圧ローラ６２１は、両端部が押圧ばね（不図示）によって定着ベルト６１１を介して熱受け板６１３に押圧され定着ニップＮを形成する。また、移動機構（不図示）によって、定着ベルト６１１の外周面と接離可能に支持されている。定着動作時は、定着ベルト６１１に従動して図２の矢印Ｒ方向に回転し、定着ニップＮに未定着トナー像を保持した用紙Ｐを通過させることで、熱および圧力を加えて未定着トナー像を用紙Ｐに定着する。 Both ends of the pressure roller 621 are pressed against the heat receiving plate 613 via the fixing belt 611 by pressing springs (not shown) to form a fixing nip N. As shown in FIG. Further, it is supported by a moving mechanism (not shown) so as to be able to come into contact with and separate from the outer peripheral surface of the fixing belt 611 . During the fixing operation, the fixing belt 611 rotates in the direction of arrow R in FIG. The image is fixed on the paper P.

（２．２）加熱源の構成
加熱源６１２は、図４に示すように、基材６１２Ａ上に、絶縁層６１２Ｂ、複数の抵抗発熱体６１２Ｃ、絶縁体６１２Ｄが積層されて構成されている。
基材６１２Ａは、例えばステンレス鋼（ＳＵＳ）やセラミックで形成された長尺平板であり加熱源６１２の支持体となる。基材６１２Ａの表面側にはガラスペーストを印刷・焼成して形成した絶縁層６１２Ｂを介して抵抗発熱体６１２Ｃが設けられ、更に抵抗発熱体６１２Ｃは絶縁体６１２Ｄで覆われている。 (2.2) Configuration of Heat Source As shown in FIG. 4, the heat source 612 is configured by laminating an insulating layer 612B, a plurality of resistance heating elements 612C, and an insulator 612D on a base material 612A.
The base material 612A is a long flat plate made of, for example, stainless steel (SUS) or ceramic, and serves as a support for the heat source 612 . A resistance heating element 612C is provided on the surface side of the base material 612A via an insulating layer 612B formed by printing and baking glass paste, and the resistance heating element 612C is further covered with an insulator 612D.

抵抗発熱体６１２Ｃは、図３に示すように、基材６１２Ａの表面側の定着ベルト６１１の移動方向に対して交差（直交）する長手方向（Ｙ方向）に沿って平行に、銀（Ａｇ）／パラジウム（Ｐｄ）合金を主成分とする金属ペーストを印刷して焼成することで所定の抵抗値を有する帯状の抵抗発熱体である。
抵抗発熱体６１２Ｃは、一端が重層形成した例えばＡｇ/Ｐｄ合金による良導電体膜からなる給電電極６１２Ｅを有し、不図示の電源に接続されて給電を受ける。 As shown in FIG. 3, the resistance heating element 612C is parallel to the longitudinal direction (Y direction) crossing (perpendicular to) the moving direction of the fixing belt 611 on the surface side of the base material 612A. A band-shaped resistance heating element having a predetermined resistance value by printing and baking a metal paste containing a /palladium (Pd) alloy as a main component.
The resistance heating element 612C has a power supply electrode 612E made of, for example, a good conductive film made of Ag/Pd alloy with one end layered, and is connected to a power source (not shown) to receive power.

複数の抵抗発熱体６１２Ｃの間隙Ｇの幅Ｌは、図４に示すように、それぞれの抵抗発熱体６１２Ｃの幅Ｗよりも長く形成されている。そして、給電電極６１２Ｅを残した複数の抵抗発熱体６１２Ｃ及び複数の抵抗発熱体６１２Ｃの間隙Ｇ上には、ガラスペーストを厚膜として印刷して焼成することで絶縁体６１２Ｄが形成されている。絶縁体６１２Ｄは、抵抗発熱体６１２Ｃを覆う領域のみが定着ベルト６１１の内面に向かって凸になるように形成されている。 As shown in FIG. 4, the width L of the gap G between the plurality of resistance heating elements 612C is formed longer than the width W of each resistance heating element 612C. An insulator 612D is formed by printing a thick film of glass paste and baking it on the plurality of resistance heating elements 612C and the gaps G between the plurality of resistance heating elements 612C, leaving the power supply electrodes 612E. The insulator 612D is formed so that only the region covering the resistance heating element 612C protrudes toward the inner surface of the fixing belt 611. As shown in FIG.

その結果、加熱源６１２は、定着ベルト６１１の内面と抵抗発熱体６１２Ｃの領域でより強く接触することになり、図５（ｂ）に示すように、定着ニップＮ内での圧力分布は、発熱する抵抗発熱体６１２Ｃの領域がそれ以外の領域よりも高い二山状になる。 As a result, the heat source 612 comes into stronger contact with the inner surface of the fixing belt 611 in the area of the resistance heating element 612C, and as shown in FIG. The area of the resistive heating element 612C that is in the shape of two peaks is higher than the other areas.

これにより、複数の抵抗発熱体６１２Ｃの間隙Ｇの領域に潤滑剤Ｓを保持して定着ベルト６１１の内面の濡れ性を効果的に担保して、加熱源６１２と接触しながら周回移動する定着ベルト６１１の内周面の摺動特性を向上させることができる。 As a result, the lubricant S is held in the area of the gap G between the plurality of resistance heating elements 612C, and the wettability of the inner surface of the fixing belt 611 is effectively ensured. The sliding property of the inner peripheral surface of 611 can be improved.

また、抵抗発熱体６１２Ｃを覆う領域の凸状絶縁体６１２Ｄは、複数の抵抗発熱体６１２Ｃの間隙Ｇの幅Ｌとの関係において、突出高さＨがＬ≦α・Ｈ（αは所定の定数：α＝６０～２４０）、Ｌ≧絶縁距離、になるように形成されていることが好ましい。
一例として、間隙Ｇの幅Ｌが２ｍｍ、定数αが１００～１５０の範囲に於いて突出高さＨは１３μｍ～２０μｍの突出量となり、発熱する抵抗発熱体６１２Ｃの領域で定着ニップＮ内での圧力分布がその周囲よりも比較的強くなり定着ベルト６１１の内面への密着性が向上し、間隙Ｇの領域では圧力分布が低くなることで摩擦抵抗の増加が抑制される。 In addition, the projecting insulator 612D in the region covering the resistive heating elements 612C has a protrusion height H in relation to the width L of the gap G between the plurality of resistive heating elements 612C. : α=60 to 240) and L≧insulation distance.
As an example, when the width L of the gap G is 2 mm and the constant α is in the range of 100 to 150, the protrusion height H is 13 μm to 20 μm. The pressure distribution is relatively stronger than the surrounding area, and the adhesion to the inner surface of the fixing belt 611 is improved.

「変形例」
図６（ａ）は抵抗発熱体６１２Ｃの間隙Ｇの幅Ｌが広い場合の定着ニップＮを示す断面模式図、（ｂ）は定着ニップＮ内での圧力分布の一例を示す図、図７（ａ）は変形例に係る加熱源６１２を示す断面模式図、（ｂ）は定着ニップＮ内での圧力分布の一例を示す図、図８は絶縁体６１２Ｄの厚さを説明する加熱源６１２の拡大断面模式図である。 "Variation"
FIG. 6A is a schematic cross-sectional view showing the fixing nip N when the width L of the gap G of the resistance heating element 612C is wide, FIG. 8A is a cross-sectional schematic diagram showing a heat source 612 according to a modification, FIG. 8B is a diagram showing an example of pressure distribution in the fixing nip N, and FIG. It is an enlarged cross-sectional schematic diagram.

複数の抵抗発熱体６１２Ｃの間隙Ｇの幅Ｌが広い場合には、加圧ローラ６２１で定着ベルト６１１の内周面が加熱源６１２側へ押圧されて定着ベルト６１１の内周面が間隙Ｇを覆う絶縁体６１２Ｄの中央部と接触して定着ニップＮ内での圧力分布は、発熱する抵抗発熱体６１２Ｃの領域と間隙Ｇの中央部がそれ以外の領域よりも高い三山状になる。そのために、複数の抵抗発熱体６１２Ｃの間隙Ｇの複数の領域Ｇ１、Ｇ２において潤滑剤Ｓを保持することができ、定着ベルト６１１の内周面の摺動特性をより向上させることができる。 When the width L of the gap G between the plurality of resistance heating elements 612C is large, the pressure roller 621 presses the inner peripheral surface of the fixing belt 611 toward the heat source 612, and the inner peripheral surface of the fixing belt 611 fills the gap G. The pressure distribution within the fixing nip N in contact with the central portion of the covering insulator 612D has a three-peak shape in which the region of the resistive heating element 612C that generates heat and the central portion of the gap G are higher than the other regions. Therefore, the lubricant S can be retained in the plurality of regions G1 and G2 of the gaps G between the plurality of resistance heating elements 612C, and the sliding characteristics of the inner peripheral surface of the fixing belt 611 can be further improved.

一方、加熱源６１２が小型である場合には、複数の抵抗発熱体６１２Ｃの間隙Ｇの幅Ｌも狭くなり、定着ニップＮ内での圧力分布は、三山状にはなりにくい。
図７（ａ）に示すように、変形例に係る加熱源６１２は、絶縁体６１２Ｄが複数の抵抗発熱体６１２Ｃの間隙Ｇの中央部において凸状に形成されている。
そのために、定着ニップＮ内での圧力分布は、図７（ｂ）に示すように、発熱する抵抗発熱体６１２Ｃの領域と間隙Ｇの中央部がそれ以外の領域よりも高い三山状になり、複数の抵抗発熱体６１２Ｃの間隙Ｇの複数の領域Ｇ１、Ｇ２において潤滑剤Ｓを保持することができる。これにより、定着ベルト６１１の内周面の摺動特性をより確実に向上させることができる。 On the other hand, when the heat source 612 is small, the width L of the gap G between the plurality of resistance heating elements 612C is also narrow, and the pressure distribution within the fixing nip N is less likely to be triangular.
As shown in FIG. 7A, in the heat source 612 according to the modification, an insulator 612D is formed in a convex shape at the center of the gap G between a plurality of resistance heating elements 612C.
Therefore, as shown in FIG. 7B, the pressure distribution in the fixing nip N has a three-peak shape in which the region of the heat-generating resistance heating element 612C and the central portion of the gap G are higher than the other regions. Lubricant S can be held in a plurality of regions G1 and G2 of gaps G between a plurality of resistance heating elements 612C. As a result, the sliding characteristics of the inner peripheral surface of the fixing belt 611 can be improved more reliably.

図８に示すように、絶縁体６１２Ｄの厚みは、抵抗発熱体６１２Ｃを覆う部分の厚みｔ１が基材６１２Ａを覆う部分の厚みｔ２よりも薄く形成されている。
これにより、抵抗発熱体６１２Ｃを覆う部分の厚みｔ１が基材６１２Ａを覆う部分の厚みｔ２よりも厚く形成されている場合に比べて、加熱源６１２から定着ベルト６１１への絶縁体６１２Ｄによる伝熱効率の低下を抑制することができる。 As shown in FIG. 8, the thickness of the insulator 612D is such that the thickness t1 of the portion covering the resistance heating element 612C is thinner than the thickness t2 of the portion covering the base material 612A.
As a result, the heat transfer efficiency of the insulator 612D from the heat source 612 to the fixing belt 611 is higher than in the case where the thickness t1 of the portion covering the resistance heating element 612C is thicker than the thickness t2 of the portion covering the base material 612A. can be suppressed.

「変形例２」
図９は変形例２に係る加熱源６１２の絶縁体６１２Ｄの厚さを説明する断面模式図である。図９に示すように、変形例２に係る加熱源６１２においては、絶縁体６１２Ｄの厚みは、抵抗発熱体６１２Ｃを覆う部分の厚みｔ１が基材６１２Ａを覆う部分の厚みｔ２よりも厚く形成されている。 "Modification 2"
FIG. 9 is a schematic cross-sectional view illustrating the thickness of the insulator 612D of the heat source 612 according to Modification 2. As shown in FIG. As shown in FIG. 9, in the heat source 612 according to Modification 2, the insulator 612D is formed so that the thickness t1 of the portion covering the resistance heating element 612C is thicker than the thickness t2 of the portion covering the base material 612A. ing.

これにより、抵抗発熱体６１２Ｃを覆う部分の厚みｔ１が基材６１２Ａを覆う部分の厚みｔ２よりも薄く形成されている場合に比べて、複数の抵抗発熱体６１２Ｃの間隙Ｇの領域に潤滑剤Ｓを保持できる窪みが形成されて、定着ベルト６１１の内面の濡れ性を効果的に担保して周回移動する定着ベルト６１１の内周面の摺動特性を向上させることができる。 As a result, the lubricant S is applied to the regions of the gaps G of the plurality of resistance heating elements 612C, compared to the case where the thickness t1 of the portion covering the resistance heating elements 612C is thinner than the thickness t2 of the portion covering the base material 612A. is formed, the wettability of the inner surface of the fixing belt 611 is effectively ensured, and the sliding property of the inner peripheral surface of the fixing belt 611 that moves around can be improved.

「変形例３」
図１０は変形例３に係る加熱源６１２の絶縁体６１２Ｄの厚さを説明する断面模式図である。図１０に示すように、変形例３に係る加熱源６１２においては、絶縁体６１２Ｄの厚みは、抵抗発熱体６１２Ｃの間隙Ｇを覆う部分の厚みｔ２が抵抗発熱体６１２Ｃよりも外側の基材６１２Ａを覆う部分の厚みｔ３よりも薄く形成されている。 "Modification 3"
FIG. 10 is a schematic cross-sectional view for explaining the thickness of the insulator 612D of the heat source 612 according to Modification 3. As shown in FIG. As shown in FIG. 10, in the heat source 612 according to Modification 3, the thickness of the insulator 612D is such that the thickness t2 of the portion covering the gap G of the resistance heating element 612C is greater than the thickness t2 of the base material 612A outside the resistance heating element 612C. is formed thinner than the thickness t3 of the portion covering the .

これにより、抵抗発熱体６１２Ｃの間隙Ｇを覆う部分の厚みｔ２が抵抗発熱体６１２Ｃよりも外側の基材６１２Ａを覆う部分の厚みｔ３よりも厚く形成されている場合に比べて、複数の抵抗発熱体６１２Ｃの間隙Ｇの領域に形成される潤滑剤Ｓを保持できる窪みを増大させて、定着ベルト６１１の内面の濡れ性をより効果的に担保して周回移動する定着ベルト６１１の内周面の摺動特性を向上させることができる。 As a result, the thickness t2 of the portion covering the gap G of the resistance heating element 612C is thicker than the thickness t3 of the portion covering the base material 612A outside the resistance heating element 612C. By increasing the number of recesses that can hold the lubricant S formed in the region of the gap G of the body 612C, the wettability of the inner surface of the fixing belt 611 is more effectively ensured, and the inner peripheral surface of the fixing belt 611 that moves in a circular motion is increased. Sliding properties can be improved.

１・・・画像形成装置
１０・・・制御装置
２０・・・給紙装置
３０・・・感光体ユニット
３１・・・感光体ドラム
４０・・・現像装置
４２・・・現像ローラ
５０・・・転写装置
５１・・・中間転写ベルト
５３・・・二次転写ローラ
６０・・・定着装置
６１・・・加熱モジュール
６１１・・・定着ベルト
６１２・・・加熱源
６１２Ａ・・・基材
６１２Ｂ・・・絶縁層
６１２Ｃ・・・抵抗発熱体
６１２Ｄ・・・絶縁体
Ｇ・・・間隙
Ｓ・・・潤滑剤
Ｎ・・・定着ニップ DESCRIPTION OF SYMBOLS 1... Image forming apparatus 10... Control apparatus 20... Paper feeder 30... Photoreceptor unit 31... Photoreceptor drum 40... Developing device 42... Developing roller 50... Transfer device 51 Intermediate transfer belt 53 Secondary transfer roller 60 Fixing device 61 Heating module 611 Fixing belt 612 Heating source 612A Base material 612B Insulating layer 612C Resistance heating element 612D Insulator G Gap S Lubricant N Fixing nip

Claims (8)

循環するベルト部材と、
前記ベルト部材に接触し、前記ベルト部材との間を移動する記録媒体を加圧する加圧部材と、
前記ベルト部材の内面に介在する潤滑剤と、
基材上に複数の抵抗発熱体と前記複数の抵抗発熱体及び前記複数の抵抗発熱体の間隙を覆う絶縁体を有し、前記ベルト部材の内面を加熱する加熱源と、を備え、
前記加熱源は、前記複数の抵抗発熱体の位置で前記加圧部材に向けて凸状となり、前記複数の抵抗発熱体の間隙においては前記凸状よりも幅広で前記抵抗発熱体の延びる方向に沿って連続した凹状で、前記間隙の中央部において凸状となるように形成されている、
ことを特徴とする定着装置。 a circulating belt member;
a pressing member that contacts the belt member and presses the recording medium moving between the belt member;
a lubricant interposed on the inner surface of the belt member;
a heating source that has a plurality of resistance heating elements on a base material, and an insulator that covers the plurality of resistance heating elements and gaps between the plurality of resistance heating elements, and heats the inner surface of the belt member;
The heat source forms a convex shape toward the pressure member at the positions of the plurality of resistance heating elements, and is wider than the convex shape in the gap between the plurality of resistance heating elements and extends in the direction in which the resistance heating elements extend. a continuous concave shape along the gap and a convex shape at the center of the gap ,
A fixing device characterized by: 前記加熱源は、前記ベルト部材と前記加圧部材とが接触する接触部のうち、前記複数の抵抗発熱体の前記間隙において、圧力が前記記録媒体の移動方向の下流側と上流側よりも相対的に高くなるように前記ベルト部材を内側から支持する、
ことを特徴とする請求項１に記載の定着装置。 In the contact portion where the belt member and the pressure member are in contact with each other, the heat source is configured such that the pressure in the gap between the plurality of resistance heating elements is relatively higher than that on the downstream side and the upstream side in the moving direction of the recording medium. supporting the belt member from the inside so as to be relatively high;
2. The fixing device according to claim 1, wherein: 前記複数の抵抗発熱体の前記間隙の幅は、前記抵抗発熱体の幅よりも長い、
ことを特徴とする請求項２に記載の定着装置。 the width of the gap of the plurality of resistance heating elements is longer than the width of the resistance heating elements;
3. The fixing device according to claim 2, wherein: 前記絶縁体の厚みは、前記抵抗発熱体を覆う部分が前記基材を覆う部分よりも薄い、
ことを特徴とする請求項１に記載の定着装置。 The thickness of the insulator is such that a portion covering the resistance heating element is thinner than a portion covering the base material.
2. The fixing device according to claim 1, wherein: 前記絶縁体の厚みは、前記抵抗発熱体を覆う部分が前記基材を覆う部分よりも厚い、
ことを特徴とする請求項１に記載の定着装置。 The thickness of the insulator is such that a portion covering the resistance heating element is thicker than a portion covering the base material.
2. The fixing device according to claim 1, wherein: 前記絶縁体の厚みは、前記複数の抵抗発熱体の間にある基材を覆う部分が前記抵抗発熱体よりも外側にある前記基材を覆う部分よりも薄い、
ことを特徴とする請求項４又は５のいずれか１項に記載の定着装置。 The thickness of the insulator is such that a portion covering the base between the plurality of resistance heating elements is thinner than a portion covering the base outside the resistance heating elements.
6. The fixing device according to claim 4, wherein: 前記潤滑剤は、少なくとも前記ベルト部材と前記間隙との間に介在する、
ことを特徴とする請求項１ないし６のいずれか1項に記載の定着装置。 the lubricant intervenes at least between the belt member and the gap ;
The fixing device according to any one of claims 1 to 6, characterized in that: 記録媒体への画像形成を行う画像形成手段と、
前記画像形成手段により画像が形成された前記記録媒体への前記画像を定着する請求項１ないし７のいずれか１項に記載の定着装置と、を備えた、
ことを特徴とする画像形成装置。 an image forming means for forming an image on a recording medium;
and a fixing device according to any one of claims 1 to 7 for fixing the image on the recording medium on which the image is formed by the image forming means,
An image forming apparatus characterized by:
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003077621A (en) 2001-09-05 2003-03-14 Canon Inc Heater and image forming device
JP2006092831A (en) 2004-09-22 2006-04-06 Harison Toshiba Lighting Corp Ceramic heater, fixing device and image forming apparatus
JP2009199862A (en) 2008-02-21 2009-09-03 Harison Toshiba Lighting Corp Ceramic heater, heating device, and image formation device
JP2010122558A (en) 2008-11-21 2010-06-03 Mitsubishi Pencil Co Ltd Heater for fixing, and method for manufacturing the same
JP2016212132A (en) 2015-04-30 2016-12-15 キヤノンファインテック株式会社 Fixing device and image forming apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003077621A (en) 2001-09-05 2003-03-14 Canon Inc Heater and image forming device
JP2006092831A (en) 2004-09-22 2006-04-06 Harison Toshiba Lighting Corp Ceramic heater, fixing device and image forming apparatus
JP2009199862A (en) 2008-02-21 2009-09-03 Harison Toshiba Lighting Corp Ceramic heater, heating device, and image formation device
JP2010122558A (en) 2008-11-21 2010-06-03 Mitsubishi Pencil Co Ltd Heater for fixing, and method for manufacturing the same
JP2016212132A (en) 2015-04-30 2016-12-15 キヤノンファインテック株式会社 Fixing device and image forming apparatus

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